538 results on '"Li, Jiayi"'
Search Results
2. Preparation of the Environmentally Friendly and High Stable Gel Foam Based on Biomass Xanthan Gum for Inhibiting Coal Spontaneous Combustion.
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Nie, Shibin, Han, Chao, Li, Jiayi, Xu, Liangji, Zhang, Haoran, Yang, Jinian, Zhang, Hong, Dai, Guanglong, Wang, Zihan, and Chen, Cheng
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SPONTANEOUS combustion ,COAL combustion ,SURFACE active agents ,FOAM ,COAL ,BIOMASS - Abstract
In order to improve the environmental friendliness of inhibiting coal spontaneous combustion, a new environmentally friendly biomass gel foam was successfully prepared by using xanthan gum (XG), aluminum citrate (Alcit), gluconate-δ-Lactone (GDL), alkyl glycoside (APG), and tea saponin (TS). When the concentrations of XG, Alcit, GDL and biomass composite foaming agent were 4, 4, 0.4, and 0.3 wt%, respectively, the gel foam had a half-life of up to 27 days. The gel foam water retention study showed that the water loss rate of its was 60% lower than that of water and 58.6% lower than that of foam after heating at 60°C for 10 h. The temperature-programmed experiment showed that the gel foam could delay the accelerated oxidation temperature of coal from 90°C to 140°C. The fire extinguishing experiment showed that the gel foam could extinguish coal fire quickly, the temperature of coal rapidly dropped from 960°C to 121°C within the first 20 min and the reburning of coal fire was not observed after the extinguishment. This study is useful for the development of environmentally friendly gel foams for inhibiting coal spontaneous combustion. [ABSTRACT FROM AUTHOR]
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- 2024
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3. Prevalence and prognosis of malignancy in THSD7A-associated membranous nephropathy: a systematic literature review and clinical case study.
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Xu, Qianqian, Li, Jiayi, Yang, Yue, Zhuo, Li, Gao, Hongmei, Jiang, Shimin, and Li, Wenge
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LITERATURE reviews ,SMALL cell lung cancer ,PROGNOSIS ,KIDNEY diseases ,RENAL cancer ,BK virus - Abstract
This study aims to investigate the incidence and prognosis of malignancy in individuals with thrombospondin type-1 domain-containing 7A (THSD7A)-associated membranous nephropathy (MN). First, we performed a systematic literature review of prevalence of malignancy in THSD7A-associated MN. Then, we conducted a retrospective analysis of 454 patients diagnosed with MN through renal biopsy at our hospital between January 2016 and December 2020. We assessed the presence of serum anti-THSD7A antibodies and performed immunohistochemical staining of renal tissue for THSD7A. Subsequently, we followed patients with THSD7A-associated MN for a minimum of 3–5 years, collecting their clinical, pathological characteristics, and prognosis. Additionally, we conducted a literature review on patients with THSD7A-associated MN in conjunction with malignancy. We identified a total of nine articles containing comprehensive data on THSD7A-associated MN and malignancy. Among 235 patients with THSD7A-positive MN, 36 individuals had concurrent malignancies, resulting in a malignancy prevalence of 13.3% (95% CI: 8.9–17.7%). In our center, we followed up with 15 patients diagnosed with THSD7A-associated MN and observed three cases of concomitant tumors: two cases of lung adenocarcinoma and one case of small cell lung cancer with multiple metastases. The prevalence of malignancy in our cohort was 20%. Notably, we detected positive THSD7A staining in both renal and lung cancer tissues in one patient with small cell lung cancer. Patients with THSD7A-associated MN should undergo vigilant follow-up assessments, with a particular focus on actively seeking potential tumorigenic lesions to prevent misdiagnosis or oversight. [ABSTRACT FROM AUTHOR]
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- 2024
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4. Temperature‐Sensitive Polymer‐Driven Nanomotors for Enhanced Tumor Penetration and Photothermal Therapy.
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Ma, Beng, Yu, Ying, Li, Jiayi, Zhang, Yunqi, Sun, Bo, Ji, Anqi, Song, Kexing, Shi, Linlin, Hu, Hao, Gao, Shegan, and Cheng, Haoyan
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- 2024
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5. A bibliometric analysis and visualization of non-suicidal self-injury in adolescents.
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Luo, Jingtong, Yang, Xueru, Li, Hongli, Fan, Lin, Chen, Xuehe, Li, Jiayi, and Song, Tianming
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Background: Non-suicidal self-injury(NSSI)is a widespread occurrence among adolescents, and this behavior can bring serious consequences. In recent years, the prevalence of NSSI continues to rise, which has attracted the attention of many researchers. But currently there is no research exploring the overall research distribution of NSSI in adolescents through quantitative analysis. Therefore, it is necessary to understand the status of development and main research hotspots of NSSI in adolescents via bibliometric analysis. Methods: We searched the relevant studies from the Web of Science Core Collection(WoSCC)from January 1, 2014 to December 31, 2023. Using CiteSpace and VOSviewer visual analysis tools, we analyzed studies from the perspectives of country, region, institution, journal, author, and keywords. Result: A total of 2177 studies related to NSSI in adolescents were included. USA and Harvard University were the leading country and institution in this research field. Penelope Hasking was the most prolific author. Frontiers in Psychiatry and the Journal of Affective Disorders were the most productive journals. The most high-frequency keywords were 'depression', 'mental health', 'emotion regulation' and 'borderline personality disorder'. 'mindfully', 'intervention', 'self-compassion' and 'ecological momentary assessment' were the emerging keywords. Conclusions: Exploring the relevant factors and mechanisms of comorbidities, identifying etiology and risk/protective factors, and finding the impact of NSSI on adolescents are the hot topics. Moreover, intervention measures and interdisciplinary collaborative research for NSSI in adolescents will emerge as frontiers in the future. [ABSTRACT FROM AUTHOR]
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- 2024
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6. Allergenicity evaluation of an extensively hydrolyzed infant formula based on cow milk protein.
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Li, Hongbo, Yang, Lin, Li, Jiayi, Gao, Quan, Liu, Tiantian, Zou, Yang, Chen, Xiaohong, Li, Hongjuan, and Yu, Jinghua
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- 2024
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7. An amino and triazole-containing metal–organic framework: cellobiose sensing and its catalytic conversion under mild conditions.
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Huang, Fangmin, Li, Jiayi, Li, Jiabiao, Yang, Tingyu, Wu, Pengyan, Chen, Xinyu, Sun, Junlei, Shi, Yanhui, and Wang, Jian
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SACCHARIDES ,CELLOBIOSE ,TRIAZOLES ,MOIETIES (Chemistry) ,DETECTORS - Abstract
A novel metal–organic framework functionalized with amino and triazole moieties, namely Zn-TDA, has been synthesized. It represents the first example of a MOF-based sensor for highly selective sensing of cellobiose over other saccharides. Furthermore, Zn-TDA was used as a catalyst for the conversion of cellobiose to 5-hydroxymethylfurfural (5-HMF), achieving an excellent yield of 68.7% within 90 min under mild conditions. [ABSTRACT FROM AUTHOR]
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- 2024
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8. Facial synthesis of MCeOx/porous carbon (M = Fe, Ni, and Co) composites with dielectric/magnetic properties for microwave absorption.
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Chang, Jijin, Wu, Zhihong, Niu, Dan, Ren, Anwen, Xu, Yifan, Li, Jiayi, Qi, Jun, and Zhou, Huafeng
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A major challenge is the synergistic regulation of porous carbon materials' dielectric and magnetic loss to produce lightweight and broadband absorption performance. This study used bamboo powders as a carbon source during hydrothermal and pyrolysis processes to create MCeO
x /PC (M = Fe, Ni, and Co) composites. The NiCeOx /PC composites demonstrate outstanding microwave absorption (MA) performance with a minimum reflection loss (RLmin ) of −58.21 dB at a thickness of 1.9 mm, and an effective absorption bandwidth (EAB) of 4.74 GHz (covering 13.26–18.00 GHz) at a matched thickness of 1.6 mm, which is attributed to the synergistic effect of their excellent impedance matching, dielectric and magnetic loss. Furthermore, the highest radar cross-section (RCS) attenuation of 16.55 dB m2 is achieved by the RCS in comparison to the perfect electric conductor (PEC) plate, suggesting a potential practical use. This work offers a theoretical foundation for the production of carbon-based MA materials obtained from sustainable biomass. [ABSTRACT FROM AUTHOR]- Published
- 2024
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9. The potential of natural products to inhibit abnormal aggregation of α-Synuclein in the treatment of Parkinson's disease.
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Yang, Kaixia, Lv, Zhongyue, Zhao, Wen, Lai, Guogang, Zheng, Cheng, Qi, Feiteng, Zhao, Cui, Hu, Kaikai, Chen, Xiao, Fu, Fan, Li, Jiayi, Xie, Guomin, Wang, Haifeng, Wu, Xiping, and Zheng, Wu
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PARKINSON'S disease ,NATURAL products ,NEUROLOGICAL disorders ,HOMEOSTASIS ,OVERPRODUCTION - Abstract
Parkinson's disease (PD), as a refractory neurological disorder with complex etiology, currently lacks effective therapeutic agents. Natural products (NPs), derived from plants, animals, or microbes, have shown promising effects in PD models through their antioxidative and anti-inflammatory properties, as well as the enhancement of mitochondrial homeostasis and autophagy. The misfolding and deposition of α-Synuclein (α-Syn), due to abnormal overproduction and impaired clearance, being central to the death of dopamine (DA) neurons. Thus, inhibiting α-Syn misfolding and aggregation has become a critical focus in PD discovery. This review highlights NPs that can reduce α-Syn aggregation by preventing its overproduction and misfolding, emphasizing their potential as novel drugs or adjunctive therapies for PD treatment, thereby providing further insights for clinical translation. [ABSTRACT FROM AUTHOR]
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- 2024
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10. Heterologous Expression of Type II PKS Gene Cluster Leads to Diversified Angucyclines in Streptomyces albus J1074.
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Zhang, Xiaoting, Zhang, Falei, Li, Chen, Li, Jiayi, Xu, Xiao, Zhu, Tianjiao, Che, Qian, Li, Deihai, and Zhang, Guojian
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Heterologous expression has emerged as an effective strategy in activating Streptomyces cryptic gene clusters or improving yield. Eight compounds were successfully obtained by heterologous expression of the type II PKS gene cluster spi derived from marine Streptomyces sp. HDN155000 in the chassis host Streptomyces albus J1074. The structures with absolute configurations were elucidated using extensive MS and NMR spectroscopic methods, as well as theoretical NMR calculations and electronic circular dichroism (ECD) calculations. Interestingly, compound WS009 Z (2) contains a rare thiomethyl group, angumycinone T (4) has a novel oxo-bridge formed between C12a and C4, and angumycinone X (3) showed cytotoxicity toward K562 and NCI-H446/EP cell lines. [ABSTRACT FROM AUTHOR]
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- 2024
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11. m6A methylation of RNF43 inhibits the progression of endometriosis through regulating oxidative phosphorylation via NDUFS1.
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Tang, Yuxia, Lu, Xingfei, Lin, Kexin, Li, Jiayi, Yuan, Ming, and Lin, Kaiqing
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OXIDATIVE phosphorylation ,NADH dehydrogenase ,GENE expression ,ECTOPIC tissue ,STROMAL cells - Abstract
Oxidative phosphorylation is becoming increasingly important in the induction and development of endometriosis. Recently, it has been reported that ring finger protein 43 (RNF43) is involved in the process of oxidative phosphorylation, but the mechanism remains unclear. Our investigation is to delve into the roles of RNF43 in endometriosis and elucidate the related mechanisms. We found RNF43 was downregulated in ectopic endometrial tissue and primary ectopic endometrial stromal cells (ECESCs). Knockdown of RNF43 enhanced cell viability and migration by activating oxidative phosphorylation in eutopic endometrial stromal cells (EUESCs), while overexpression of RNF43 led to the opposite results. Moreover, RNF43 reinforced the ubiquitination and degradation of NADH dehydrogenase Fe‐S protein 1 (NDUFS1) by interacting with it. Likewise to RNF43 overexpression, NDUFS1 silencing inhibited cell viability, migration, and oxidative phosphorylation in ECESCs. NDUFS1 was a downstream target of RNF43, mediating its biological role in endometriosis. Interestingly, the expression and stability of RNF43 mRNA were regulated by the Methyltransferase‐like 3 (METTL3)/IGF2BP2 m6A modification axis. The results of rat experiments showed decreased RNF43 expression and increased NDUFS1 expression in endometriosis rats, which was enhanced by METTL3 inhibition. Those observations indicated that m6A methylation‐mediated RNF43 negatively affects viability and migration of endometrial stromal cells through regulating oxidative phosphorylation via NDUFS1. The discovery of METTL3/RNF43/NDUFS1 axis suggested promising therapeutic targets for endometriosis. [ABSTRACT FROM AUTHOR]
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- 2024
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12. A Review of Indoor Localization Methods Leveraging Smartphone Sensors and Spatial Context.
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Li, Jiayi, Song, Yinhao, Ma, Zhiliang, Liu, Yu, and Chen, Cheng
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EVIDENCE gaps ,MULTISENSOR data fusion ,SMARTPHONES ,LOCATION-based services ,SENSOR placement ,LOCALIZATION (Mathematics) - Abstract
As Location-Based Services (LBSs) rapidly develop, indoor localization technology is garnering significant attention as a critical component. Smartphones have become tools for indoor localization due to their highly integrated sensors, fast-evolving computational capabilities, and widespread user adoption. With the rapid advancement of smartphones, methods for smartphone-based indoor localization have increasingly attracted attention. Although there are reviews on indoor localization, there is still a lack of systematic reviews focused on smartphone-based indoor localization methods. In particular, existing reviews have not systematically analyzed smartphone-based indoor localization methods or considered the combination of smartphone sensor data with prior knowledge of the indoor environment to enhance localization performance. In this study, through systematic retrieval and analysis, the existing research was first categorized into three types to dissect the strengths and weaknesses based on the types of data sources integrated, i.e., single sensor data sources, multi-sensor data fusion, and the combination of spatial context with sensor data. Then, four key issues are discussed and the research gaps in this field are summarized. Finally, a comprehensive conclusion is provided. This paper offers a systematic reference for research and technological applications related to smartphone-based indoor localization methods. [ABSTRACT FROM AUTHOR]
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- 2024
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13. Investigating the Multifaceted Impact of Urban Environment on Winter Green Travel in Cold Regions: An Empirical Study of Shenyang, China.
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Du, Yu, Wang, Xinyao, Dou, Chenxi, Wu, Yongjian, and Li, Jiayi
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Green travel offers significant benefits, including reducing pollution and alleviating traffic congestion. Despite these advantages, green travel is less popular in cold regions, particularly during winter, due to comfort, convenience, and safety concerns. While climate factors are immutable, enhancing the urban environment can promote winter green travel. This paper examines the impact of urban environments on residents' willingness to engage in green travel in cities located in cold regions during winter. Using data from Shenyang, China, a comprehensive structural equation model based on the stimulus–organism–response (S-O-R) theory was constructed, revealing the causal relationships and underlying structure between environmental factors and green travel willingness. The model demonstrates that social, built, natural, and travel environments collectively shape residents' willingness to engage in green travel, with the social environment emerging as the most impactful factor. Additionally, this study identified two crucial mediating variables, travel perception evaluation and attitude towards green travel, which indirectly influence green travel willingness. This study also identifies nine critical factors—often underappreciated in traditional analyses—that should be prioritised in urban planning. These findings advance the understanding of green travel behaviour in winter cities by illustrating the complex interplay between environmental factors and individual attitudes while providing actionable guidance for fostering supportive social environments and strategically enhancing built and travel environments to promote green travel in cold climates. [ABSTRACT FROM AUTHOR]
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- 2024
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14. Study on the Performance of a Novel Highly Stable Nano-Hydroxyapatite Gel Foam to Inhibit Coal Spontaneous Combustion.
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Han, Chao, Nie, Shibin, Liu, Zegong, Yang, Jinian, Zhang, Hong, Li, Jiayi, and Zhang, Haoran
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SPONTANEOUS combustion ,X-ray photoelectron spectroscopy ,THERMAL coal ,BLOCKCHAINS ,METAL bonding ,COAL combustion - Abstract
The preparation of gel foams with high stability for inhibiting coal spontaneous combustion remains a huge challenge. In this paper, a highly stable gel foam (SCTH) was developed by introducing nano-hydroxyapatite (HAP) into gel foam system (sodium alginate/calcium L-lactate/tannic acid/composite forming agent). The effects of HAP on the foam performances of SCTH were analyzed. The results showed that HAP could improve the stability of SCTH by forming hydrogen bonds, metal ion bonds with the system and interfacial barriers. After 100 days, SCTH without HAP had only 44.8% of the foam volume remaining. The SCTH with 1.2 wt% HAP had 80% of the volume remaining. In addition, the SCTH had better safety. Thermogravimetric analysis showed that the SCTH could improve the maximum weight loss rate temperature, and increase the residual weight of the coal after thermal decomposition. The coal temperature-programmed oxidation experiment showed that the SCTH could increase the temperature of coal entering the rapid oxidation stage from 120 to 190°C, and the CO inhibition rate was 85.3% at 200°C. Fire suppression experiment showed that the SCTH could reduce the temperature of burning coal by 81.9% within 10 min, thus achieving rapid fire suppression. X-ray photoelectron spectroscopy analysis showed that the SCTH could more effectively reduce the total content of C=O and -COO in coal and block the chain cycle reaction of coal. This work presents a new design idea for using multifunctional nanoparticles to prepare highly stable gel foams with excellent inhibition performance of coal spontaneous combustion. [ABSTRACT FROM AUTHOR]
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- 2024
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15. Preparation of New Eco-Friendly Gel Foam Based on Biomass Pectin Material for Fire Prevention of Coal.
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Nie, Shibin, Zhang, Haoran, Han, Chao, Li, Jiayi, Yang, Jinian, Zhang, Hong, Dai, Guanglong, and Su, Hailin
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FIRE prevention ,POLLUTION ,COAL ,FOAM ,BIOMASS ,SURFACE active agents - Abstract
The traditional gel foam materials have achieved certain effects in preventing coal fire. However, the traditional gel foam materials commonly use chemical compounds which cause harm to the environment. Therefore, based on biomass materials such as low methoxyl pectin (LMP), calcium L-lactate (Ca-L), and biomass compound foaming agent (BF), a new eco-friendly gel foam (LMP-Ca) was prepared. The foaming performance, gelling time, stability, coal oxidation inhibition and fire extinguishing performances of LMP-Ca were systematically studied. The study shows that the gelling time of LMP-Ca with 1.2 wt% LMP, 0.075 wt% Ca-L and 0.03 wt% BF is 10 min and the half-life is up to 216 h. Moreover, the LMP-Ca has excellent film-forming performance, and the isolation film with thickness up to 2.5 mm can be formed on the surface. The coal oxidation inhibition experiment shows that LMP-Ca can effectively delay the oxidation rate of coal with the temperature rising, and the inhibition rate of CO is 72.1% at 180°C. The fire extinguishing experiment shows that the temperature of the coal treated by LMP-Ca decreases rapidly from 960 to 60°C in 20 min and to 30°C in the following 110 min without the reignition phenomenon. The result indicates that LMP-Ca has excellent fire extinguishing performance. This study is helpful to develop eco-friendly coal fire prevention and control technology, and overcome the shortcomings of traditional gel foam on environmental pollutions. [ABSTRACT FROM AUTHOR]
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- 2024
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16. Transformation Mechanism of Organic Matter in the Treatment of Petroleum-Based Drilling Cuttings by the Hammermill Thermal Desorption Cutting Treatment System.
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Lin, Dong, Yue, Hong, Jiang, Guobin, Zhao, Liang, Yu, Jinlei, Li, Jiayi, Meng, Tian, Wang, Hongjuan, and Chen, Xinglong
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ION cyclotron resonance spectrometry ,THERMAL desorption ,HAZARDOUS wastes ,SHALE gas ,CHEMICAL reactions - Abstract
Petroleum-based drilling cuttings (PBDCs), as hazardous waste, are characterized by high petroleum pollutant contents and complex compositions and must be properly treated. Their treatment by a hammermill thermal desorption system can generate a variety of products, necessitating better delineation of the transformation characteristics of organic matter at the molecular level. In this study, the transformation characteristics of organic matter in the treatment of PBDCs by a hammermill thermal desorption system have been analyzed by positive-ion atmospheric-pressure photo-ionization Fourier-transform ion cyclotron resonance mass spectrometry (+APPI FT-ICR MS). The results showed that the PBDCs contained large amounts of CH, CHO, and CHON compounds and a small amount of CHS compounds. Of these, CH and CHO compounds are easily separated and recovered by the hammermill thermal desorption treatment system. Most of this organic matter is separated directly through physical changes, whereas only 0.32% undergoes chemical reactions. The organic matter in the recovered petroleum and #110 industrial white oil was highly reproducible and similar in terms of saturation and aromaticity. The mineral composition of the PBDCs did not change significantly during treatment by the hammermill thermal desorption system. This research may provide theoretical guidance for the efficient treatment of PBDCs by the hammermill thermal desorption system. [ABSTRACT FROM AUTHOR]
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- 2024
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17. The reciprocal relationships between core self-evaluation, academic burnout and deviant peer affiliation in adolescence.
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Li, Jiayi, Ding, Wan, Sun, Zhaoxing, and Xie, Ruibo
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CHINESE people ,SOCIAL interaction ,SELF-evaluation ,SELF-perception ,TEENAGERS ,MASLACH Burnout Inventory ,PSYCHOLOGICAL burnout - Abstract
During adolescence, academics occupy a significant portion of time, and social needs reach their peak. It is crucial to explore two key challenges faced by adolescents: deviant peer affiliation and academic burnout. According to Self-Verification Theory, adolescents tend to select information that is consistent with their self-concept. This study aims to investigate the interrelationships among adolescents' core self-evaluation, academic burnout, and deviant peer affiliation. 1214 Chinese adolescents (M
age = 15.46, SDage = 0.71) from central China completed a questionnaire survey on Academic Burnout Inventory, Core Self-evaluation Scale, and Deviant Peer Affiliation Questionnaire. The findings revealed that deviant peer affiliation positively predicted academic burnout, while the reverse was not observed. Core self-evaluation was found to be predictors of both academic burnout and deviant peer affiliation, and in turn, core self-evaluation was influenced by the two factors. In addition, a dynamic cyclical relationship was found between core self-evaluation and academic burnout, and the mutual relations between academic burnout and deviant peer affiliation were through core self-evaluation. This research enhanced our comprehension of adolescents' self-evaluation, academic challenges, and peer interactions, highlighted the need to focus on the enduring influence of core self-evaluation on adolescents. [ABSTRACT FROM AUTHOR]- Published
- 2024
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18. SASS6 promotes tumor proliferation and is associated with TP53 and immune infiltration in lung adenocarcinoma.
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Li, Zihao, He, Lingyun, Li, Jiayi, Qian, Jing, Wu, Zuotao, Zhu, Yongjie, Zhuo, Ting, Nong, Jusen, Liang, Honghua, Zheng, Hua, Huang, Weijia, Huang, Julu, and Cao, Jianbin
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NON-small-cell lung carcinoma ,IMMUNE checkpoint proteins ,CELL cycle ,FUNCTIONAL analysis ,CANCER diagnosis - Abstract
The most common type of non-small cell lung cancer is lung adenocarcinoma (LUAD), which is characterized by high morbidity and poor survival. Up-regulation of SASS6 expression can lead to the progression of various malignant tumors. However, there are no relevant studies on the role of SASS6 in LUAD. SASS6 was highly expressed in most tumors, reflecting a good diagnostic value, and its overexpression in LUAD indicated discouraging overall prognosis. Functional enrichment analysis suggested that SASS6 was associated with cell cycle in LUAD. In addition, patients with high SASS6 expression had worse immune infiltration, but higher TMB and immune checkpoint, and higher sensitivity to multiple targeted drugs such as osimertinib. Cell experiments confirmed that knockdown of SASS6 could inhibit the viability of tumor cells.SASS6 has important value in the diagnosis of cancer. In particular, SASS6 is a crucial factor in the progression of LUAD, and has important clinical value, especially in the diagnosis, prognosis and treatment [ABSTRACT FROM AUTHOR]
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- 2024
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19. Freeze Metal Halide Perovskite for Dramatic Laser Tuning: Direct Observation via In Situ Cryo‐Electron Microscope.
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Li, Jiayi, Jiang, Jing, Zhang, Yuchen, Lin, Zhenhui, Pang, Zhentao, Guan, Jie, Liu, Zhiyu, Ren, Yifeng, Li, Shiheng, Lin, Renxing, Wu, Jie, Wang, Jian, Zhang, Ziyou, Dong, Hongliang, Chen, Zhiqiang, Wang, Yuanyuan, Yang, Yurong, Tan, Hairen, Zhu, Jia, and Lu, Zhenda
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- 2024
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20. Sensitive detection of persulfate by a novel self-powered electrochemical sensor with carbon cloth electrodes modified with tin-doped cobalt tetroxide.
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Tang, Wanting, Liu, Weifeng, Li, Zhe, Liu, Ke, Jiang, Tao, Wang, Shanhui, Qu, Kai, Li, Jiayi, Zhang, Xingzhu, and Zhu, Yimin
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CARBON fibers ,ELECTROCHEMICAL sensors ,CARBON electrodes ,CHARGE exchange ,CATALYTIC reduction - Abstract
The accurate and rapid detection of persulfate concentration is important for environmental decontamination and human health protection. In this work, a novel self-powered electrochemical sensor for the sensitive monitoring of persulfate was developed, which utilized cobalt tetroxide (Co
3 O4 @CC) or tin-doped cobalt tetroxide (Snx Co3−x O4 @CC) cathode as the sensing element and anode with electrogenic microorganisms as the power supplier. The Co3 O4 @CC and Snx Co3−x O4 @CC electrodes were fabricated by in situ growing nanostructured Co3 O4 or Snx Co3−x O4 catalysts on carbon cloth. Electrochemical tests revealed that these electrodes exhibited excellent catalytic reduction performance toward persulfate because of the synergistic catalysis by Co3 O4 and electrode electrons, well-exposed Co2+ /Co3+ catalytic sites, and high electron transfer efficiency. Tin doping could enhance the catalytic persulfate reduction by improving the conductivity and electron transfer of the Co3 O4 catalyst. The electrode prepared at a hydrothermal temperature of 90 °C and a tin dosage of 0.286 g·cm−2 achieved the highest persulfate reduction activity under pH 7. The sensing properties of the self-powered sensors toward persulfate were explored in detail. Results showed that under the optimal external load of 300 Ω, the proposed sensor could display a broad detection range of 0 to 1500 μmol L−1 K2 S2 O8 with sensitivities of 1.13 and 0.12 μA μmol−1 L, a detection limit of 1.11 μmol L−1 (S/N = 3), and a fast response time within 30 s. The sensors also presented satisfactory reproducibility and selectivity during the detection of persulfate. The proposed sensor will provide a new approach for sensitive, on-site, and real-time monitoring of persulfate for a wide range of applications. [ABSTRACT FROM AUTHOR]- Published
- 2024
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21. The mask paradox between perception of discomfort and reality of physiological effects in healthy college students in China: a panel study.
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Wang, Songtao, Hao, Jiayuan, Ruan, Qianyi, Hong, Xuanxuan, Yu, Zicheng, Huang, Jiawen, Li, Jiayi, Gao, Dongna, and Liu, Suyang
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MEDICAL masks ,COVID-19 pandemic ,DIASTOLIC blood pressure ,WELL-being ,STAIR climbing - Abstract
Background: During the COVID-19 pandemic, masks proved to be an effective measure in preventing virus transmission. However, many people have reported discomfort and negative perceptions toward wearing masks, especially during physical activity. This study aims to evaluate the discomfort and adverse perceptions related to various mask types among young, healthy adults during light exercise, including sitting, stationary stepping, and stair climbing. The study also examines the extent to which masks influence physiological indicators of physical well-being. Methods: The study was conducted in two stages at the campus hospital of Shantou University. In Stage 1, 20 healthy college students (10 males, 10 females) were recruited to identify the mask with the most substantial physiological and psychological impact among four types: KN
95 respirators, surgical masks, cloth masks, and 3D medical masks. These specific types were chosen due to their widespread use and varying levels of filtration and breathability. In Stage 2, 14 healthy college students (7 males, 7 females) were included to examine the effects of the identified mask across various levels of physical exertion. Subjective perceptions were measured using the Mask-Related Discomfort and Perception Score (MRDPS), and physiological parameters such as body temperature, blood pressure, pulse rate, and vital capacity were recorded. Results: The KN95 respirator and cloth mask were associated with the highest MRDPS, indicating significant discomfort among wearers (p < 0.05). The use of KN95 respirators had the largest impact on MRDPS during stair stepping (β = 10.357, 95% CI [5.755, 14.959]). Physiological parameters showed minor variations across different masks, with KN95 respirators significantly associated with reduced diastolic blood pressure (β=-7.806, 95% CI [-12.294, -3.318]) and pulse rate (β=-10.661, 95% CI [-18.896, -2.425]) in Stage 1. However, after controlling for exercise pace in Stage 2, wearing a KN95 respirator did not significantly affect these parameters. Conclusions: KN95 respirators and cloth masks were found to cause the most discomfort during light physical activity, with males reporting higher discomfort levels than females. While these masks are associated with varying levels of perceived discomfort, their impact on physiological indicators is relatively modest. Future research should include larger and more diverse samples , continuous monitoring of physiological parameters during exercise, and exploration of the underlying mechanisms of gender differences in mask discomfort. [ABSTRACT FROM AUTHOR]- Published
- 2024
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22. 3D Lead‐Organoselenide‐Halide Perovskites and their Mixed‐Chalcogenide and Mixed‐Halide Alloys.
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Li, Jiayi, Wang, Yang, Saha, Santanu, Chen, Zhihengyu, Hofmann, Jan, Misleh, Jason, Chapman, Karena W., Reimer, Jeffrey A., Filip, Marina R., and Karunadasa, Hemamala I.
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BAND gaps ,DISTRIBUTION (Probability theory) ,PEROVSKITE ,DENSITY functional theory ,SOLAR cells - Abstract
We incorporate Se into the 3D halide perovskite framework using the zwitterionic ligand: SeCYS (+NH3(CH2)2Se−), which occupies both the X− and A+ sites in the prototypical ABX3 perovskite. The new organoselenide‐halide perovskites: (SeCYS)PbX2 (X=Cl, Br) expand upon the recently discovered organosulfide‐halide perovskites. Single‐crystal X‐ray diffraction and pair distribution function analysis reveal the average structures of the organoselenide‐halide perovskites, whereas the local lead coordination environments and their distributions were probed through solid‐state 77Se and 207Pb NMR, complemented by theoretical simulations. Density functional theory calculations illustrate that the band structures of (SeCYS)PbX2 largely resemble those of their S analogs, with similar band dispersion patterns, yet with a considerable band gap decrease. Optical absorbance measurements indeed show band gaps of 2.07 and 1.86 eV for (SeCYS)PbX2 with X=Cl and Br, respectively. We further demonstrate routes to alloying the halides (Cl, Br) and chalcogenides (S, Se) continuously tuning the band gap from 1.86 to 2.31 eV–straddling the ideal range for tandem solar cells or visible‐light photocatalysis. The comprehensive description of the average and local structures, and how they can fine‐tune the band gap and potential trap states, respectively, establishes the foundation for understanding this new perovskite family, which combines solid‐state and organo‐main‐group chemistry. [ABSTRACT FROM AUTHOR]
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- 2024
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23. 3D Lead‐Organoselenide‐Halide Perovskites and their Mixed‐Chalcogenide and Mixed‐Halide Alloys.
- Author
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Li, Jiayi, Wang, Yang, Saha, Santanu, Chen, Zhihengyu, Hofmann, Jan, Misleh, Jason, Chapman, Karena W., Reimer, Jeffrey A., Filip, Marina R., and Karunadasa, Hemamala I.
- Subjects
BAND gaps ,DISTRIBUTION (Probability theory) ,PEROVSKITE ,DENSITY functional theory ,SOLAR cells - Abstract
We incorporate Se into the 3D halide perovskite framework using the zwitterionic ligand: SeCYS (+NH3(CH2)2Se−), which occupies both the X− and A+ sites in the prototypical ABX3 perovskite. The new organoselenide‐halide perovskites: (SeCYS)PbX2 (X=Cl, Br) expand upon the recently discovered organosulfide‐halide perovskites. Single‐crystal X‐ray diffraction and pair distribution function analysis reveal the average structures of the organoselenide‐halide perovskites, whereas the local lead coordination environments and their distributions were probed through solid‐state 77Se and 207Pb NMR, complemented by theoretical simulations. Density functional theory calculations illustrate that the band structures of (SeCYS)PbX2 largely resemble those of their S analogs, with similar band dispersion patterns, yet with a considerable band gap decrease. Optical absorbance measurements indeed show band gaps of 2.07 and 1.86 eV for (SeCYS)PbX2 with X=Cl and Br, respectively. We further demonstrate routes to alloying the halides (Cl, Br) and chalcogenides (S, Se) continuously tuning the band gap from 1.86 to 2.31 eV–straddling the ideal range for tandem solar cells or visible‐light photocatalysis. The comprehensive description of the average and local structures, and how they can fine‐tune the band gap and potential trap states, respectively, establishes the foundation for understanding this new perovskite family, which combines solid‐state and organo‐main‐group chemistry. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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24. Facile synthesis of copper sulfide wire/carbon nanotube composite with improved sodium storage performance.
- Author
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Wang, Siyi, Liu, Hongying, Li, Zhongyu, Li, Jiayi, Li, Lin, Chi, Ru'an, and Wang, Shiquan
- Subjects
COPPER sulfide ,RAMAN scattering ,COPPER wire ,RAMAN spectroscopy ,COPPER - Abstract
One-dimensional copper sulfide (CuS) wires were realized by the acrylamide-assisted hydrothermal process using Cu(NO
3 )2 and thiourea (NH2 CSNH2 ) as reactants at 100 °C. A copper sulfide/carbon nanotube (CNTs) composite was fabricated as a similar method with the addition of CNTs. The samples are characterized by XRD, SEM, TEM, and Raman scattering spectra, respectively. The influence of reaction temperature and amine on the morphologies of CuS nanocrystals was investigated. As anode materials for sodium-ion batteries, the electrochemical studies show that the CuS/CNT composite electrode delivers a higher reversible capacity of 428.1 mA h g−1 at 0.1 A g−1 for the 100th cycle, because CNTs can be a conductive agent to provide a fast path for electron transportation, compared with the bare CuS wires (280 mAh·g−1 after 100 cycles). The synthesis results indicate that the amine-directed synthesis strategy of copper sulfide could be extended for the preparation of other metal sulfide nanostructures. Further, the incorporation of the CNT matrix into the copper sulfide is an effective approach to enhance the electrochemical performance of CuS. [ABSTRACT FROM AUTHOR]- Published
- 2024
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25. Characterization of AGAMOUS Ortholog and Promoter from the Ilex verticillata (Aquifoliaceae).
- Author
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Li, Jiayi, Su, Yalan, Chen, Xiangjian, and Liu, Zhixiong
- Subjects
FLOWER development ,GENITALIA ,VESTIGIAL organs ,CARPEL ,WOODY plants - Abstract
Arabidopsis AGAMOUS (AG) plays a crucial role in specifying stamen and carpel identities, floral meristem identity determination, and repression of the A-function. Ilex verticillata (Aquifoliaceae) is a dioecious shrub, whereby an individual plant has either male or female flowers with vestigial organs of the opposite sex. The molecular mechanism of male and female organ development in I. verticillata remains unknown. In order to identify the possible roles of AG-like genes in regulating floral development in I. verticillata, AG ortholog (IlveAG) and its promoter (pIlveAG) from the male and female flowers of I. verticillata were separately isolated. IlveAG is highly expressed in stamens, pistils, and sepals of male and female flowers. Moreover, obvious GUS staining was observed in the inflorescence and sepals, stamens, and pistils of mature flowers in pIlveAG::GUS Arabidopsis. The 35S::IlveAG Arabidopsis showed obviously early flowering. Moreover, IlveAG could substitute for endogenous AG to rescue the stamen and pistil in the Arabidopsis ag-1 mutant. In addition, expression of IlveAG can inhibit the development of sepals and petals (two outer whorls of floral organs) in wild-type and ag-1 Arabidopsis. Our findings suggest that IlveAG has a conservative C-function and plays key roles in determination of reproductive floral organs (stamen and carpel) identity and meristem determinacy. Our results provide more details to understand the role of AG orthologs in the development of male and female flowers in woody plants. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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26. Improving adult eating behaviours by manipulating time perspective: a systematic review and meta-analysis.
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Chew, Han Shi Jocelyn, Li, Jiayi, and Chng, Samuel
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BEHAVIORAL assessment ,OBESITY treatment ,MEDICAL information storage & retrieval systems ,BODY mass index ,FOOD consumption ,CINAHL database ,SELF-control ,META-analysis ,DELAY discounting (Psychology) ,SYSTEMATIC reviews ,MEDLINE ,FOOD habits ,TIME management ,MEDICAL databases ,ONLINE information services ,FOOD preferences ,CONFIDENCE intervals ,PSYCHOLOGY information storage & retrieval systems ,FOOD portions ,ADULTS - Abstract
There is a growing body of research on improving health behaviours through future thinking but that in improving eating behaviour remains unclear. Hence, we conducted a systematic review and meta-analysis on the effectiveness of time perspective manipulation in improving adult eating behaviours. Articles published from inception through 17 March 2022 were retrieved from eight databases (CINAHL, Embase, ProQuest, PsycINFO, PubMed, Scopus, The Cochrane library, and Web of Science). Meta-analysis was conducted using random effects models with effect sizes reported in Hedges' g. Sixteen experimental studies were included, representing 1,914 participants with mean ages ranging from 20.5 to 44.1 years old and mean baseline BMI of 22.0 kg/m
2 to 37.2 kg/m2 . The interventions included were episodic future thinking (EFT; n = 12), message framing (n = 2), and varying inter-meal intervals (IMI; n = 2) in improving food choices, food intake and portion size. Two studies reported significant interventional effectiveness for domain-specific EFT while all studies on message framing and IMI reported significant interventional effectiveness. Message framing seemed to be more effective when both temporal distance and valence frames were manipulated. However, the pooled effect sizes of all the interventions did not result in a significant interventional effect (n = 5; g = −0.49; 95% confidence interval (CI) = −1.44, 0.47; p = 0.23; I2 =87.2%). More rigorous research is needed to ascertain the effectiveness of manipulating time perspective in improving eating behaviours before such interventions are more widely used. [ABSTRACT FROM AUTHOR]- Published
- 2024
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27. Research on pressure loss calculation and determination of porous media resistance coefficients based on flow simulation of feed counterflow cooler.
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Li, Jiayi, Si, Haiqing, Qiu, Jingxuan, Wu, Chaochao, and Zhuang, Di
- Subjects
FLOW coefficient ,POROUS materials ,FLOW simulations ,FLOW velocity ,DRAG coefficient ,COUNTERFLOWS (Fluid dynamics) - Abstract
In the feed industry, counterflow coolers are widely used cooling devices. The flow characteristics and pressure loss should be focused on during the design and optimization stages. Due to the complex accumulation of feed particles, it is difficult to accurately analyze the flow field behavior inside the cooler through experiments. Therefore, a detailed study was conducted with a cooler from Buhler using a simulation approach. First of all, the significant influence of the porous jump boundary of flap outlet in the simulation model on the flow field and temperature distribution was revealed. Second, limitations of the Ergun equation in estimating the drag coefficients of the porous medium and the porous jump boundary were explored. Finally, a rapid calculation model for pressure loss was established based on simulation data. Within a wide range of resistance coefficient inputs, the relative error between the model calculation and the corresponding simulation results is very small. Using this model to input a series of resistance coefficients, combined with a small number of overall pressure loss measurements for comparison, the resistance coefficient of the porous medium of the new material can be determined, solving the problem in determining this coefficient through typical measurement experiments at low flow velocity and the lack of effective estimation formulas. This research can provide practical references for improving cooling equipment and enhancing cooler efficiency, and the rapid calculation model can be extended to any fluid machinery containing porous media materials that satisfy Darcy–Forchheimer's law. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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28. Who Experiences Greater Happiness When Dining Together? A Study of the Relationship Between Dining with Family Members and the Mental Health of Chinese Students.
- Author
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Chen, Xuan, Li, Jiayi, Zhang, Peng, Hu, Huan, Yan, Wei, and Peng, Kaiping
- Abstract
The mental well-being and dietary habits of adolescents have gained considerable attention over the past decades. The focus of most of the previous research has centered on the impact of specific food types and family meal frequency on mental health. However, the relationship between how often families eat together and other varied eating habits on the psychological well-being of young people remains under-researched. To address this, a survey was conducted among a large sample of students from Chinese elementary to high schools (N = 374,487). The study classified eating arrangement into three categories: only with family members, a combination of eating with family and other situations, and not eating with family at all. Findings indicate that regular meals with family correlate with a decrease in depressive symptoms and an increase in life satisfaction and positive mental health. This study also tested grade and gender differences. The highest grade range (10th -12th grade) showed the least impact on their mental health, which may be attributed to maturation and shifts in social relationships. The findings also suggest that the influence of eating arrangements on mental health was more pronounced among girls than boys, although this effect was relatively mild. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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29. DNA damage response in breast cancer and its significant role in guiding novel precise therapies.
- Author
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Li, Jiayi, Jia, Ziqi, Dong, Lin, Cao, Heng, Huang, Yansong, Xu, Hengyi, Xie, Zhixuan, Jiang, Yiwen, Wang, Xiang, and Liu, Jiaqi
- Subjects
DNA repair ,BREAST cancer ,DRUG resistance ,DRUG toxicity ,CELLULAR signal transduction ,POLY ADP ribose - Abstract
DNA damage response (DDR) deficiency has been one of the emerging targets in treating breast cancer in recent years. On the one hand, DDR coordinates cell cycle and signal transduction, whose dysfunction may lead to cell apoptosis, genomic instability, and tumor development. Conversely, DDR deficiency is an intrinsic feature of tumors that underlies their response to treatments that inflict DNA damage. In this review, we systematically explore various mechanisms of DDR, the rationale and research advances in DDR-targeted drugs in breast cancer, and discuss the challenges in its clinical applications. Notably, poly (ADP-ribose) polymerase (PARP) inhibitors have demonstrated favorable efficacy and safety in breast cancer with high homogenous recombination deficiency (HRD) status in a series of clinical trials. Moreover, several studies on novel DDR-related molecules are actively exploring to target tumors that become resistant to PARP inhibition. Before further clinical application of new regimens or drugs, novel and standardized biomarkers are needed to develop for accurately characterizing the benefit population and predicting efficacy. Despite the promising efficacy of DDR-related treatments, challenges of off-target toxicity and drug resistance need to be addressed. Strategies to overcome drug resistance await further exploration on DDR mechanisms, and combined targeted drugs or immunotherapy will hopefully provide more precise or combined strategies and expand potential responsive populations. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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- View/download PDF
30. Porous liquids: a novel porous medium for efficient carbon dioxide capture.
- Author
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Zhang, Xiao, Li, Jiayi, Lu, Fei, Xie, Fengjin, Xu, Xinming, Su, Long, Gao, Xinpei, and Zheng, Liqiang
- Abstract
Porous liquids (PLs) are the combination of porous solid material and flowing liquid, which provides alternative options to solve difficulties in the development of porous solids. With the booming development of PLs since 2015, plenty of syntheses and applications have been reported with a specific focus on gas adsorption. Given the lack of a comprehensive review, this paper reviews the application of PLs in CO
2 capture. To start with, ground-breaking case studies are reviewed to help understand the progress of PLs research. Then, as a major part of this paper, studies of PLs for CO2 capture are reviewed separately. Moreover, five basic properties of porous liquids, including stability, viscosity, selectivity, porosity, capacity, and the influencing factors are systemically reviewed respectively. Furthermore, gas storage and release mechanisms in PLs are briefly outlined, and potential processing methods of PLs used for CO2 capture are discussed. [ABSTRACT FROM AUTHOR]- Published
- 2024
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31. Solanesol Ameliorates Anxiety-like Behaviors via the Downregulation of Cingulate T Cell-Restricted Intracellular Antigen-1 in a Complete Freund's Adjuvant-Induced Mouse Model.
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Ding, Shufan, Li, Yifan, Chen, Zhichao, Hu, Jingnan, Li, Jiayi, Li, Junlan, and Wang, Yongjie
- Subjects
TUMOR necrosis factors ,STRESS granules ,WESTERN immunoblotting ,CINGULATE cortex ,ANXIETY disorders - Abstract
Anxiety disorder is a universal disease related to neuro-inflammation. Solanesol has shown positive effects because of its anti-inflammatory, anti-tumor, and anti-ulcer properties. This study focused on determining whether solanesol could ameliorate anxiety-like behaviors in a mouse model of neuro-inflammation and identify its working targets. Complete Freund's adjuvant (CFA)-induced mice that were intra-peritoneally administered with solanesol (50 mg/kg) for 1 week showed a statistically significant reduction in anxiety-like behaviors, as measured by open field and elevated plus-maze tests. Western blot analysis revealed that CFA-induced upregulation of the levels of pro-inflammatory cytokines interleukin (IL)-1β and tumor necrosis factor α (TNF-α), which played crucial roles in regulating anxiety, returned to normal in the anterior cingulate cortex (ACC) after solanesol treatment. The level of T cell-restricted intracellular antigen-1 (TIA1), a key component of stress granules, also decreased in the ACC. Moreover, immunofluorescence results indicated that solanesol suppressed CFA-induced microglial and astrocytic activation in the ACC. CFA was injected in the hind paws of TIA1
Nestin conditional knockout (cKO) mice to confirm whether TIA1 is a potential modulatory molecule that influences pro-inflammatory cytokines and anxiety-like behaviors. Anxiety-like behaviors could not be observed in cKO mice after CFA injection with IL-1β and TNF-α levels not remarkedly increasing. Our findings suggest that solanesol inhibits neuro-inflammation by decreasing the TIA1 level to reduce IL-1β and TNF-α expression, meanwhile inhibiting microglial and astrocytic activation in the ACC and ultimately ameliorating anxiety-like behaviors in mice. [ABSTRACT FROM AUTHOR]- Published
- 2024
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32. S-Nitrosylation of p39 promotes its degradation and contributes to synaptic dysfunction induced by β-amyloid peptide.
- Author
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Cheng, Aobing, Wang, Jingyi, Li, Jiayi, Wang, Jie, Xu, Mufan, Chen, Hongzhuan, and Zhang, Peng
- Subjects
AMYLOID beta-protein precursor ,ALZHEIMER'S disease ,PEPTIDES ,DENDRITES ,NITRIC oxide - Abstract
Alzheimer's disease (AD), characterized by cognitive decline, is increasingly recognized as a disorder marked by synaptic loss and dysfunction. Despite this understanding, the underlying pathophysiological mechanisms contributing to synaptic impairment remain largely unknown. In this study, we elucidate a previously undiscovered signaling pathway wherein the S-nitrosylation of the Cdk5 activator p39, a post-translational modification involving the addition of nitric oxide to protein cysteine residues, plays a crucial role in synaptic dysfunction associated with AD. Our investigation reveals heightened p39 S-nitrosylation in the brain of an amyloid precursor protein (APP)/presenilin 1 (PS1) transgenic mouse model of AD. Additionally, soluble amyloid-β oligomers (Aβ), implicated in synaptic loss in AD, induce p39 S-nitrosylation in cultured neurons. Notably, we uncover that p39 protein level is regulated by S-nitrosylation, with nitric oxide S-nitrosylating p39 at Cys265 and subsequently promoting its degradation. Furthermore, our study demonstrates that S-nitrosylation of p39 at Cys265 significantly contributes to amyloid-β (Aβ) peptide-induced dendrite retraction and spine loss. Collectively, our findings highlight S-nitrosylation of p39 as a novel aberrant redox protein modification involved in the pathogenesis of AD, suggesting its potential as a therapeutic target for the disease. This study highlights S-nitrosylation of p39, a post-translational modification in which nitric oxide is attached to free cysteine residues, as a novel aberrant redox protein modification involved in the synaptic dysfunction in Alzheimer's disease pathogenesis. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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- View/download PDF
33. The Impact of Monitoring on Reseller Slackness: The Mediating Role of Channel Conflict.
- Author
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Pang, Fanglan, Li, Jiayi, and Wei, Ruifeng
- Subjects
RESALE ,DECISION making ,ACQUISITION of data ,SUPPLIERS ,EXPECTATION (Psychology) - Abstract
Purpose: The purpose of this study is to examine how monitoring influences reseller slackness. We try to answer the following: (1) How do monitoring (behavior monitoring and output monitoring affect reseller slackness? (2) What is the mechanism by which monitoring affects reseller slackness? Methodology/approach: The study proposed a theoretical framework using behavior monitoring, output monitoring, and channel conflict as the antecedents, as well as reseller slackness as a consequence. To validate the model, we collected data from resellers across multiple industries in China and analyzed data from 222 valid responses using multiple regression methods. Findings: Supplier behavior monitoring decreases reseller slackness, whereas supplier output monitoring increases it. In addition, channel conflict mediates the impact of monitoring on reseller slackness. Research implications: Based on the expectation that the partnership will grow in the long term, both partners should minimize channel conflict, and resellers need to curb their slack behavior. While output monitoring can give resellers more freedom to make decisions, this study shows that output monitoring can exacerbate inter-firm conflict and promote reseller slackness. Therefore, managers should be cautious about using output monitoring strategies for reseller slackness management. Practical implications: Our findings suggest that behavior monitoring can mitigate channel conflict and reduce reseller slackness. However, output monitoring can facilitate channel conflict, promoting reseller slackness. As a result of these findings, suppliers can better manage reseller slackness by understanding the effects of different types of monitoring. Originality/value: This study makes two contributions to existing literature. Firstly, it empirically examines the role of behavior and output monitoring on reseller slackness, thus enriching the existing literature on reseller slackness. Secondly, it further clarifies the specific pathways through which monitoring affects reseller slackness and lays the foundation for future research on managing it. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
34. The selection of hospital sites and adaptive medical resource planning in the post-COVID era: navigating public health crises in China?
- Author
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Wang, Xinkai, Dockerill, Bertie, Li, Xue, Huang, Jingxian, Li, Jiayi, and Chen, Junlong
- Subjects
COVID-19 pandemic ,COVID-19 ,PUBLIC health ,FACILITY management ,OPEN access publishing ,HEALTH facilities ,HOSPITALS - Abstract
Urban management and planning during public health emergencies, such as the COVID-19 pandemic, are critical. This article examines hospital site selection in Yinzhou, Ningbo, China, using geographical data analysis. It evaluates travel costs and referral patterns between hospitals and community health facilities to establish a sustainable hierarchical diagnosis and treatment system. The results reveal that existing medical facilities, particularly in rural areas, are inadequate during public health emergencies. The article proposes considering total transportation costs in allocating the sites of new hospitals and suggests adopting a 'permanent + temporary' facility planning approach to ease financial burdens. Addressing these issues can mitigate the inequitable distribution of urban and rural medical resources. This article was published open access under a CC BY licence: https://creativecommons.org/licenses/by/4.0/. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
35. Distinct discrepancy in breast cancer organoids recapitulation among molecular subtypes revealed by single‐cell transcriptomes analysis.
- Author
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Jia, Ziqi, Xu, Hengyi, Zhang, Yaru, Cao, Heng, Deng, Chunyu, Xu, Longchen, Sun, Yuning, Li, Jiayi, Huang, Yansong, Pu, Pengming, Shang, Tongxuan, Wang, Xiang, Su, Jianzhong, and Liu, Jiaqi
- Subjects
HER2 positive breast cancer ,TRIPLE-negative breast cancer ,MEDICAL sciences ,CANCER stem cells ,BREAST cancer ,HORMONE receptor positive breast cancer - Abstract
This article explores the use of breast cancer organoids (BCOs) in personalized medicine. The study reveals that BCOs effectively preserve molecular characteristics in hormone receptor-positive and HER2-positive breast cancers, but there are notable differences in triple-negative breast cancer (TNBC) due to culture conditions. BCOs exhibit a decrease in immune and stromal cells compared to primary breast cancer tissues, but an increase in epithelial cells. The study also investigates genomic concordance, gene expression profiling, and drug sensitivity in BCOs. The findings suggest that BCOs are valuable for studying epithelial components of tumors, but may have limitations in accurately predicting drug sensitivity in TNBC. The article provides supporting information for a research project and is authored by a group of individuals whose names are listed at the end of the article. [Extracted from the article]
- Published
- 2024
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- View/download PDF
36. New glucosidated indole-quinazoline alkaloids from mangrove endophytic fungus Aspergillus fumigatus SAl12.
- Author
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Guo, Shili, Zhou, Haiming, Huang, Xin, Peng, Siyan, Li, Jiayi, Ding, Bo, Tao, Yiwen, and Huang, Hongbo
- Subjects
ASPERGILLUS fumigatus ,QUINAZOLINE ,ENDOPHYTIC fungi ,ANTIBACTERIAL agents ,ALKALOIDS - Abstract
Two new glucosidated indole-containing quinazoline alkaloids designated fumigatosides G (1) and H (2) were isolated from mangrove-derived fungus Aspergillus fumigatus SAl12, together with the known analogues fumigatoside B (3) and fumiquinazoline J (4). The planar structures of the new compounds were elucidated by HR-MS and NMR spectroscopic data analyses. The absolute configurations were determined by comparison of electronic circular dichroic (ECD) spectra with that of the known compound fumigatoside B and with the calculated ECD spectrum. All these indole-quinazoline compounds were tested for anti-bacterial and cytotoxic activities. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
37. The Relationship Between Three-Dimensional Spatial Structure and CO 2 Emission of Urban Agglomerations Based on CNN-RF Modeling: A Case Study in East China.
- Author
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Pan, Banglong, Dong, Doudou, Diao, Zhuo, Wang, Qi, Li, Jiayi, Feng, Shaoru, Du, Juan, Li, Jiulin, and Wu, Gen
- Abstract
Good urban design helps mitigate carbon dioxide emissions and is important for achieving global low-carbon goals. Previous studies have mostly focused on the two-dimensional level of urban socio-economic activities, urban land use changes, and urban morphology, neglecting the importance of the three-dimensional spatial structure of cities. This study takes 30 cities in East China as an example. By using urban building data and carbon emission datasets, four machine learning algorithms, BP, RF, CNN, and CNN-RF, are established to build a CO
2 emission prediction model based on three-dimensional spatial structure, and the main influencing factors are further studied. The results show that the CNN-RF model performed optimally in both the testing and validation phases, with the coefficient of determination (R2 ), root mean square error (RMSE), and residual prediction deviation (RPD) of 0.85, 0.82; 10.60, 22.32; and 2.53, 1.92, respectively. Meanwhile, in the study unit, S, V, NHB, AN, BCR, SCD, and FAR have a greater impact on CO2 emissions. This indicates a strong correlation between urban three-dimensional spatial structure and carbon emissions. The CNN-RF model can effectively evaluate the relationship between them, providing strategic support for spatial optimization of low-carbon cities. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
38. Prussian Blue Analogues for Sodium‐Ion Battery Cathodes: A Review of Mechanistic Insights, Current Challenges, and Future Pathways.
- Author
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Xiao, Yang, Xiao, Jun, Zhao, Hangkai, Li, Jiayi, Zhang, Guilai, Zhang, Dingyi, Guo, Xin, Gao, Hong, Wang, Yong, Chen, Jun, Wang, Guoxiu, and Liu, Hao
- Published
- 2024
- Full Text
- View/download PDF
39. Recent adavances of functional modules for tooth regeneration.
- Author
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Wang, Xuan, Chen, Qiuyu, Li, Jiayi, Tian, Weidong, Liu, Zhi, and Chen, Tian
- Abstract
Dental diseases, such as dental caries and periodontal disorders, constitute a major global health challenge, affecting millions worldwide and often resulting in tooth loss. Traditional dental treatments, though beneficial, typically cannot fully restore the natural functions and structures of teeth. This limitation has prompted growing interest in innovative strategies for tooth regeneration methods. Among these, the use of dental stem cells to generate functional tooth modules represents an emerging and promising approach in dental tissue engineering. These modules aim to closely replicate the intricate morphology and essential physiological functions of dental tissues. Recent advancements in regenerative research have not only enhanced the assembly techniques for these modules but also highlighted their therapeutic potential in addressing various dental diseases. In this review, we discuss the latest progress in the construction of functional tooth modules, especially on regenerating dental pulp, periodontal tissue, and tooth roots. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
40. 3D‐Printed Dendritic Cell Vaccines for Post‐Surgery Cancer Immunotherapy.
- Author
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Xu, Yangtao, Zhu, Wenxiang, Wu, Jicheng, Liu, Lujie, Yue, Ludan, Zhang, Xueyang, Li, Jiayi, She, Peng, Yang, Jingjing, Sun, Chengliang, Xu, Ximing, and Rao, Lang
- Subjects
CLINICAL medicine ,DENDRITIC cells ,THREE-dimensional printing ,CANCER vaccines ,LYMPH nodes ,CELL culture - Abstract
Dendritic cell (DC) vaccines have shown promising effects in cancer management, while low cell activity and low migration rate to lymph nodes limit their clinical application. Here, this work reports a bioink DC vaccine, synthesized by 3D printing methacryloyl gelatin to encapsulate DCs and tumor cellular vesicles overexpressing programmed cell death protein 1 (PD1‐CVs), for cancer immunotherapy. Compared with a traditional hydrogel, the porous 3D scaffold significantly improves the viability of DCs from ∼16% to ∼70% after 7 days of cell culture and increases the proportion of released DCs from the scaffold into lymph nodes by about fourfold. The PD1‐CVs stimulate DC maturation and block PD ligand‐1 (PD‐L1) in mature DCs and tumor cells, synergistically boosting DC‐mediated antitumor immunity. In breast tumor mouse models, this personalized 3D DC vaccine developed for site‐specific filling after tumor resection significantly suppress tumor recurrence and extend median survival time to 45 days. This 3D printed vaccine offers a simple, safe, and robust strategy for enhanced cell‐based cancer immunotherapy. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
41. Tailoring d–p Orbital Hybridization to Decipher the Essential Effects of Heteroatom Substitution on Redox Kinetics.
- Author
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Zhao, Jian, Zhang, Yuxiao, Zhuang, Zechao, Deng, Yating, Gao, Ge, Li, Jiayi, Meng, Alan, Li, Guicun, Wang, Lei, Li, Zhenjiang, and Wang, Dingsheng
- Subjects
ORBITAL hybridization ,TRANSITION metal compounds ,ACTIVATION energy ,ELECTRODE performance ,CHARGE transfer - Abstract
The heteroatom substitution is considered as a promising strategy for boosting the redox kinetics of transition metal compounds in hybrid supercapacitors (HSCs) although the dissimilar metal identification and essential mechanism that dominate the kinetics remain unclear. It is presented that d‐p orbital hybridization between the metal and electrolyte ions can be utilized as a descriptor for understanding the redox kinetics. Herein, a series of Co, Fe and Cu heteroatoms are respectively introduced into Ni3Se4 cathodes, among them, only the moderate Co‐substituted Ni3Se4 can hold the optimal d‐p orbital hybridization resulted from the formed more unoccupied antibonding states π*. It inevitably enhances the interfacial charge transfer and ensures the balanced OH− adsorption‐desorption to accelerate the redox kinetics validated by the lowest reaction barrier (0.59 eV, matching well with the theoretical calculations). Coupling with the lower OH− diffusion energy barrier, the prepared cathode delivers ultrahigh rate capability (~68.7 % capacity retention even the current density increases by 200 times), and an assembled HSC also presents high energy/power density. This work establishes the principles for determining heteroatoms and deciphers the underlying effects of the heteroatom substitution on improving redox kinetics and the rate performance of battery‐type electrodes from a novel perspective of orbital‐scale manipulation. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
42. Tailoring d–p Orbital Hybridization to Decipher the Essential Effects of Heteroatom Substitution on Redox Kinetics.
- Author
-
Zhao, Jian, Zhang, Yuxiao, Zhuang, Zechao, Deng, Yating, Gao, Ge, Li, Jiayi, Meng, Alan, Li, Guicun, Wang, Lei, Li, Zhenjiang, and Wang, Dingsheng
- Subjects
ORBITAL hybridization ,TRANSITION metal compounds ,ACTIVATION energy ,ELECTRODE performance ,CHARGE transfer - Abstract
The heteroatom substitution is considered as a promising strategy for boosting the redox kinetics of transition metal compounds in hybrid supercapacitors (HSCs) although the dissimilar metal identification and essential mechanism that dominate the kinetics remain unclear. It is presented that d‐p orbital hybridization between the metal and electrolyte ions can be utilized as a descriptor for understanding the redox kinetics. Herein, a series of Co, Fe and Cu heteroatoms are respectively introduced into Ni3Se4 cathodes, among them, only the moderate Co‐substituted Ni3Se4 can hold the optimal d‐p orbital hybridization resulted from the formed more unoccupied antibonding states π*. It inevitably enhances the interfacial charge transfer and ensures the balanced OH− adsorption‐desorption to accelerate the redox kinetics validated by the lowest reaction barrier (0.59 eV, matching well with the theoretical calculations). Coupling with the lower OH− diffusion energy barrier, the prepared cathode delivers ultrahigh rate capability (~68.7 % capacity retention even the current density increases by 200 times), and an assembled HSC also presents high energy/power density. This work establishes the principles for determining heteroatoms and deciphers the underlying effects of the heteroatom substitution on improving redox kinetics and the rate performance of battery‐type electrodes from a novel perspective of orbital‐scale manipulation. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
43. Perovskite‐Oxide‐Based Ferroelectric Synapses Integrated on Silicon.
- Author
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Zheng, Ningchong, Zang, Yipeng, Li, Jiayi, Shen, Cong, Jiao, Peijie, Zhang, Lunqiang, Wang, He, Han, Lu, Liu, Yuwei, Ding, Wenjuan, Yang, Xinrui, Nian, Leyan, Ma, Jianan, Jiang, Xingyu, Yin, Yuewei, Xia, Yidong, Deng, Yu, Wu, Di, Li, Xiaoguang, and Pan, Xiaoqing
- Subjects
CONVOLUTIONAL neural networks ,SILICON oxide ,SILICON wafers ,PEROVSKITE ,SYNAPSES - Abstract
Perovskite‐oxide‐based ferroelectric tunnel junctions (FTJs) hold great potential for applications in non‐volatile memory and neuromorphic computing due to their unique properties. However, the challenges in synthesizing high crystalline quality perovskite oxides directly on silicon wafer limit the applications of these FTJs in conventional Si‐based integrated circuits, let alone the neural networks. Herein, perovskite oxide FTJs with an ON/OFF ratio up to 1.2×106, writing/erasing speed down to 1 nanosecond, and cycling endurance (>106) are achieved by integrating ultrathin freestanding ferroelectric perovskite oxide membranes directly on silicon wafers using a wet‐transfer method. Moreover, synapses based on these FTJs exhibit long‐term plasticity. For handwritten digits recognition task, the convolutional neural network (CNN) simulation is implemented achieving a recognition accuracy up to 98.9% based on the experimental performance, close to the result of 99.2% by software‐floating‐point‐based CNN. This work sheds light on the integration of ferroelectric perovskite oxides directly on silicon for high‐performance FTJ‐based non‐volatile memory and synaptic devices. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
44. Effects of Patch Properties of Submerged Vegetation on Sediment Scouring and Deposition.
- Author
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Song, Yantun, Liu, Ruixiang, Yang, Qiong, Li, Jiayi, Cai, Chongfa, Feng, Yifan, Huang, Guiyun, Hao, Rong, Li, Hao, Zhan, Changhua, and Wen, Xiwang
- Subjects
SEDIMENTATION & deposition ,SEDIMENT transport ,RIPARIAN areas ,SEDIMENT control ,FLOW velocity ,DOPPLER velocimetry - Abstract
Vegetation plays a key role in trapping sediments and further controlling pollutants. However, few studies were conducted to clarify the erosion and deposition laws of sediments and the influence factors caused by vegetation patch properties, which is not conducive to the revelation of riverbank protection and erosion prevention. Therefore, this study investigated the change in scouring and deposition characteristics around submerged vegetation patches of nine kinds of typical configurations and their influencing factors. Vegetation patches were assembled from three vegetation densities (G/d = 0.83, 1.3, and 1.77, representing dense, medium, and sparse, respectively), and three vegetation patch thicknesses (dn = 170, 400, and 630, representing narrow, usual, and wide, respectively), to measure vegetation patch property influences. Flow velocity, scouring, and deposition characteristics under nine patches were determined by a hydraulic flume experiment, three-dimensional acoustic Doppler velocimetry (ADV), and three-dimensional laser scanner, and then ten geometry and morphology indices were measured and calculated based on the results of laser scanning. Results showed that both vegetation patch density and thickness were positively related to the turbulence kinetic energy (TKE) above the vegetation canopy, and only vegetation patch density was negatively related to the flow velocity above the vegetation canopy. The relation between the product of density and vegetation patch thickness and erosion area in planform (EA) showed a power function (R
2 = 0.644). Both density and vegetation patch thickness determined the scouring degree, but deposition location and amount did not rely on each one simply. On average, medium density showed the smallest maximum erosion length (MEL), EA, deposition area in planform (DA), and average deposition length (ADL) and a minimum of the above parameters also occurred at narrow vegetation patch thickness. The shape factor of the erosion volume (SFEV), the shape factor of the deposition volume (SFDV), ADL, and MEL of medium density and narrow thickness vegetation patch (G/d = 1.3, dn = 170) were significantly smaller than that of other types of patches. DA and equivalent prismatic erosion depth on the erosion area (EPED) were significantly linearly related (R2 = 0.766). Consequently, most sediment was deposited close to the vegetation patch edge. It is suggested that vegetation patch thickness and density should be given to control sediment transport. In particular, natural vegetation growth changes vegetation patch density and then alters vegetation patch thickness. Management and repair need to be first considered. The results of this study shed light on riparian zone recovery and vegetation filter strip mechanism. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
45. Cylinders intruding wet granular beds – experiment and simulation.
- Author
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Li, Jiayi, Zhang, Lijuan, Han, Kang, Lin, Shuncheng, Lu, Jie, Liu, Fengjiao, and Derksen, Jos J.
- Subjects
FLUID flow ,VISCOSITY ,EXTRACELLULAR fluid ,SPATIAL resolution ,FRICTION - Abstract
Quantitative visualization experiments and numerical simulations on cylindrical "alien" particles penetrating a liquid-saturated granular bed have been performed. The bed consists of mono-sized spheres. In dimensionless terms the bed is characterized by an Archimedes number, an angle of repose that represents friction, and a solids volume fraction. The conditions are such that the fluid flow generated by alien and bed particle motion is laminar. The experiments are well reproducible. The most important experimental observation is deeper penetration of the alien particle for higher liquid viscosities. The spatial resolution of the three-dimensional, time-dependent simulations is such that they resolve the flow around, and the motion of the individual particles. The flow solver is based on the lattice-Boltzmann method. To a certain extent the simulations are able to reproduce the viscosity effect observed experimentally. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
46. Full‐Space Electric Field in Mo‐Decorated Zn2In2S5 Polarization Photocatalyst for Oriented Charge Flow and Efficient Hydrogen Production.
- Author
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Wan, Jun, Wang, Yu, Liu, Jiaqing, Song, Ru, Liu, Lin, Li, Yaping, Li, Jiayi, Low, Jingxiang, Fu, Feng, and Xiong, Yujie
- Published
- 2024
- Full Text
- View/download PDF
47. Validating Nitrogen Removal Models with Field Bioretention Data.
- Author
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Li, Jiayi, Culver, Teresa B., Burgis, Charles R., Zhang, Wuhuan, and Smith, James A.
- Subjects
BIOSWALES ,DISSOLVED organic matter ,SOIL moisture ,RUNOFF ,NITROGEN ,WATER quality - Abstract
Bioretention is a type of stormwater best management practice that can reduce stormwater runoff volume, and with appropriate design, simultaneously reduce nitrogen loads. To meet the water quality potential of bioretention systems, improved simulation models of the transport and transformations of nitrogen are needed. In this work, two versions of a three-nitrogen-pool (3P) model (3P-1 and 3P-m) are applied to simulate observed nitrogen transport through a field bioretention system. The 3P models provide predictions of net export of dissolved organic carbon, dissolved organic nitrogen, and inorganic nitrogen species. The 3P-m model has promising results: (1) relative to the Storm Water Management Model (SWMM), it reduced the prediction error of percent removal of total dissolved nitrogen by up to 10.6% and reduces the scaled root-mean square error of total dissolved nitrogen loads by up to 53.0%; (2) it successfully captured the correlation between impactful environmental factors and event mean concentrations of total dissolved nitrogen and nitrate nitrogen in underdrain effluent; (3) its predictions on denitrification showed good alignment with observed isotope results; and (4) it demonstrated higher stability in simulated time series among calibration results than 3P-1. The 3P-m is expected to assist the design of bioretention system and valve control strategies by providing more accurate predictions on nitrogen removal under the impacts of soil moisture content and temperature. Future research and collaboration opportunities are also proposed in this article. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
48. Mitochondria‐specific antioxidant MitoTEMPO alleviates senescence of bone marrow mesenchymal stem cells in ovariectomized rats.
- Author
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Li, Jiayi, Zhang, Dahe, Zhang, Yuxin, Ge, Jing, and Yang, Chi
- Subjects
UNFOLDED protein response ,MESENCHYMAL stem cells ,CELLULAR aging ,OSTEOPOROSIS in women ,CANCELLOUS bone - Abstract
Senescence in bone marrow mesenchymal stem cells (BMSCs), triggered by excessive oxidative stress, plays a crucial role in the onset of postmenopausal osteoporosis. Recent studies underscore the importance of mitochondrial rehabilitation and quality control as key determinants in the modulation of oxidative stress and cellular senescence. MitoTEMPO, a mitochondria‐targeted antioxidant, has been shown to mitigate the heightened levels of reactive oxygen species (ROS). In our research, we observed that BMSCs from ovariectomized (OVX) rats displayed premature senescence, which was attributed to combined mitochondrial and lysosomal dysfunction, a condition that worsens with extended estrogen deprivation. Treatment with MitoTEMPO effectively reversed these effects, reinstating lysosomal functionality and suppressing the mitochondrial unfolded protein response (UPRmt). Subsequent in vivo experiments corroborated these observations, revealing that MitoTEMPO administration in OVX rats curtailed trabecular bone loss and reduced the expression of p53, HSP60, and CLPP in the trabecular bone region of the proximal tibia. Overall, our findings suggest that MitoTEMPO holds promise as a therapeutic agent to counteract senescence in OVX‐BMSCs, offering a potential strategy for treating postmenopausal osteoporosis. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
49. Competitive Video Game Exposure Increases Aggression Through Impulsivity in Chinese Adolescents: Evidence From a Multi-Method Study.
- Author
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Chen, Shuai, Wei, Mingchen, Wang, Xu, Liao, Jinqian, Li, Jiayi, and Liu, Yanling
- Subjects
CROSS-sectional method ,TASK performance ,QUESTIONNAIRES ,HIGH school students ,CHI-squared test ,AGGRESSION (Psychology) ,IMPULSIVE personality ,TEENAGERS' conduct of life ,EXPERIMENTAL design ,LONGITUDINAL method ,RESEARCH methodology ,ANALYSIS of variance ,DATA analysis software ,VIDEO games ,COMPETITION (Psychology) ,ADOLESCENCE - Abstract
It is widely known controversies about the results of violent video game increase aggression. However, the role of competitive video games, has received less research attention, and the underlying mechanisms of their influence are unknown. This study aimed to expand the existing literature by systematically exploring the effects of competitive video game exposure on adolescent aggression and the mediating role of impulsivity. In so doing, three types of studies (collectively N = 2919, mean age varied from 13.75 to 15.44 years, with a balanced gender) combining cross-sectional, experimental, and longitudinal approaches, were conducted. The findings consistently show that competitive video game exposure increased adolescents' aggression and impulsivity. Also, impulsivity mediated the correlation and long-term effect of competitive video game exposure on aggression. However, the experimental study did not confirm the short-term mediating effect of impulsivity, which may be related to the type of aggression measured in the study. The results indicate that competitive video game exposure is an important antecedent factor for adolescent aggression, and impulsivity is the key underlying mechanism. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
50. Intact NMR Approach Quickly Reveals Synchronized Microstructural Changes in Oil-in-Water Nanoemulsion Formulations.
- Author
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Wang, Deyun, Li, Jiayi, and Chen, Kang
- Abstract
A soft-core oil-in-water (o/w) nanoemulsion (NE) is composed of nanometer (nm) sized oil droplets, stabilized by a surfactant layer and dispersed in a continuous bulky water phase. Characterization of the o/w NE molecule arrangements non-invasively, particularly the drug phase distribution (DPD) and its correlation to oil globule size (OGS), remains a challenge. Here we demonstrated the analytical methods of intact
19 F Nuclear Magnetic Resonance (NMR) and1 H diffusion ordered spectroscopy (DOSY) NMR for their specificity in measuring DPD and OGS, respectively, on three NE formulations containing the active ingredient difluprednate (DFPN) at the same concentration. The results illustrated synchronized molecular rearrangement reflected in the DPD and OGS upon alterations in formulation. Addition of surfactant resulted in a higher DPD in the surfactant layer, and concomitantly smaller OGS. Mechanic perturbation converted most of the NE globules to the smaller thermodynamically stable microemulsion (ME) globules, changing both DPD and OGS to ME phase. These microstructure changes were not observed using 1D1 H NMR; and dynamic light scattering (DLS) was only sensitive to OGS of ME globule in mechanically perturbed formulation. Collectively, the study illustrated the specificity and essential role of intact NMR methods in measuring the critical microstructure attributes of soft-core NE systems quickly, accurately, and non-invasively. Therefore, the selected NMR approach can be a unique diagnostic tool of molecular microstructure or Q3 property in o/w NE formulation development, and quality assurance after manufacture process or excipient component changes. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
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