98 results on '"Jiacheng Guo"'
Search Results
52. Circulating exosomes repair endothelial cell damage by delivering miR‐193a‐5p
- Author
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Hui Zhang, Gangqiong Liu, Bo Wang, Qian-Qian Guo, Jimin Zhao, Xiao-Ting Yue, Zeng-Lei Zhang, Chang Cao, Jin-Ying Zhang, Jiacheng Guo, Yunzhe Wang, and Junnan Tang
- Subjects
0301 basic medicine ,Adult ,Dynamins ,Male ,Biopsy ,Myocardial Infarction ,exosomes ,oxidative damage ,ACVR1 ,medicine.disease_cause ,03 medical and health sciences ,0302 clinical medicine ,In vivo ,microRNA ,medicine ,Human Umbilical Vein Endothelial Cells ,Animals ,Humans ,Dynamin ,business.industry ,Gene Expression Profiling ,Gene Transfer Techniques ,Computational Biology ,Endothelial Cells ,Biological Transport ,Mesenchymal Stem Cells ,Cell Biology ,Original Articles ,Middle Aged ,Immunohistochemistry ,In vitro ,Microvesicles ,microRNAs ,Rats ,Endothelial stem cell ,Oxidative Stress ,030104 developmental biology ,Gene Expression Regulation ,030220 oncology & carcinogenesis ,Cancer research ,Molecular Medicine ,Original Article ,Female ,RNA Interference ,business ,Oxidative stress ,Plasmids - Abstract
Circulating exosomes delivering microRNAs are involved in the occurrence and development of cardiovascular diseases. How are the circulating exosomes involved in the repair of endothelial injury in acute myocardial infarction (AMI) convalescence (3‐7 days) was still not clear. In this study, circulating exosomes from AMI patients (AMI‐Exo) and healthy controls (Normal‐Exo) were extracted. In vitro and in vivo, our study showed that circulating exosomes protected endothelial cells (HUVECs) from oxidative stress damage; meanwhile, Normal‐Exo showed better protective effects. Through the application of related inhibitors, we found that circulating exosomes shuttled between HUVECs via dynamin. Microarry analysis and qRT‐PCR of circulating exosomes showed higher expression of miR‐193a‐5p in Normal‐Exo. Our study showed that miR‐193a‐5p was the key factor on protecting endothelial cells in vitro and in vivo. Bioinformatics analyses found that activin A receptor type I (ACVR1) was the potential downstream target of miR‐193a‐5p, which was confirmed by ACVR1 expression and dual‐luciferase report. Inhibitor of ACVR1 showed similar protective effects as miR‐193a‐5p. While overexpression of ACVR1 could attenuate protective effects of miR‐193a‐5p. To sum up, these findings suggest that circulating exosomes could shuttle between cells through dynamin and deliver miR‐193a‐5p to protect endothelial cells from oxidative stress damage via ACVR1.
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- 2020
53. Atherosclerosis: The Involvement of Immunity, Cytokines and Cells in Pathogenesis, and Potential Novel Therapeutics
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Junnan Tang, Jinying Zhang, Xiaolin Cui, Xunde Xian, Guozhen Liu, Yu Liu, Yichen Dai, Zhaowei Sun, Jiamin Gao, Zhen Qin, Xiaofang Wang, Yachen Hou, Jiacheng Guo, Zeyu Wang, Yongzheng Lu, and Chang Su
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Cell Biology ,Neurology (clinical) ,Geriatrics and Gerontology ,Pathology and Forensic Medicine - Published
- 2022
54. Electrochemical Oxidative C(sp3)—H Sulfonylation of Xanthenes with Sodium Sulfinates
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Renjie Song, Xuanhui Ouyang, Yexiang Xie, Shu Lei, Jiacheng Guo, Zeyu Yan, Jinghao Qin, Zilong Zhou, and Bin Wei
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Organic Chemistry - Published
- 2023
55. A Wideband 4-phase Phase-Locked Loop for Single-Slope Ramp ADC in SCA ASIC
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Yuting Wang, Lei Zhao, Jiajun Qin, Jiacheng Guo, Li Li, Shubin Liu, and Qi An
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Nuclear and High Energy Physics ,Nuclear Energy and Engineering ,Electrical and Electronic Engineering - Published
- 2023
56. Prototype of a Readout Control ASIC for Data Collection and Command Distribution
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Chunxiao Song, Jiajun Qin, Lei Zhao, Donglei Guo, Jiacheng Guo, Li Li, and Qi An
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Nuclear and High Energy Physics ,Nuclear Energy and Engineering ,Electrical and Electronic Engineering - Published
- 2023
57. A 140 GHz Gain-Boosting Power Amplifier with Sub-Harmonic Mixer in 40 nm CMOS
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Chuyou Hu, Jiacheng Guo, and Sanming Hu
- Published
- 2021
58. Two-layer collaborative optimization for a renewable energy system combining electricity storage, hydrogen storage, and heat storage
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Guangyao Fan, Zhijian Liu, Xuan Liu, Yaxin Shi, Di Wu, Jiacheng Guo, Shicong Zhang, Xinyan Yang, and Yulong Zhang
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General Energy ,Mechanical Engineering ,Building and Construction ,Electrical and Electronic Engineering ,Pollution ,Industrial and Manufacturing Engineering ,Civil and Structural Engineering - Published
- 2022
59. Two-layer co-optimization method for a distributed energy system combining multiple energy storages
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Jiacheng Guo, Zhijian Liu, Xuan Wu, Di Wu, Shicong Zhang, Xinyan Yang, Hua Ge, and Peiwen Zhang
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General Energy ,Mechanical Engineering ,Building and Construction ,Management, Monitoring, Policy and Law - Published
- 2022
60. Energy management strategies and multi-objective optimization of a near-zero energy community energy supply system combined with hybrid energy storage
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Guangyao Fan, Zhijian Liu, Xuan Liu, Yaxin Shi, Di Wu, Jiacheng Guo, Shicong Zhang, Xinyan Yang, and Yulong Zhang
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Renewable Energy, Sustainability and the Environment ,Geography, Planning and Development ,Transportation ,Civil and Structural Engineering - Published
- 2022
61. Injection-Free Delivery of MSC-Derived Extracellular Vesicles for Myocardial Infarction Therapeutics
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Qiguang Wang, Zeng-Lei Zhang, Xiaolin Cui, Junnan Tang, Hu Zhang, Jiacheng Guo, Bram G. Soliman, Yanyan Xu, Jinying Zhang, Yongzheng Lu, Khoon S. Lim, Zhen Qin, and Tim B. F. Woodfield
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food.ingredient ,Chemistry ,Visible light irradiation ,Biomedical Engineering ,Myocardial Infarction ,Pharmaceutical Science ,medicine.disease ,Extracellular vesicles ,Gelatin ,Biomaterials ,Extracellular Vesicles ,Mice ,food ,Self-healing hydrogels ,Delivery efficiency ,medicine ,Animals ,Methacrylates ,Myocardial infarction ,Heart repair ,Enzymatic degradation ,Biomedical engineering - Abstract
As emerging therapeutic factors, extracellular vesicles (EVs) offer significant potential for myocardial infarction (MI) treatment. Current delivery approaches for EVs involve either intra-myocardial or intravenous injection, where both have inherent limitations for downstream clinical applications such as secondary tissue injury and low delivery efficiency. Herein, an injection-free approach for delivering EVs onto the heart surface to treat MI is proposed. By spraying a mixture of EVs, gelatin methacryloyl (GelMA) precursors, and photoinitiators followed by visible light irradiation for 30 s, EVs are physically entrapped within the GelMA hydrogel network covering the surface of the heart, resulting in an enhanced retention rate. Moreover, EVs are gradually released from the hydrogel network through a combination of diffusion and/or enzymatic degradation of the hydrogel, and they are effectively taken up by the sprayed tissue area. More importantly, the released EVs further migrate deep into myocardium tissue, which exerts an improved therapeutic effect. In an MI-induced mice model, the group treated with EVs-laden GelMA hydrogels shows significant recovery in cardiac function after 4 weeks. The work demonstrates a new strategy for delivering EVs into cardiac tissues for MI treatment in a localized manner with high retention.
- Published
- 2021
62. Effective strategy for improving infrared emissivity of Zn-Ni porous coating
- Author
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Jiyong Zeng, Wenjiang Ding, Jiacheng Guo, Xingwu Guo, Liming Peng, Jie Dong, and Nie Lewen
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Materials science ,Infrared ,General Physics and Astronomy ,02 engineering and technology ,Electrolyte ,engineering.material ,010402 general chemistry ,01 natural sciences ,law.invention ,Coating ,law ,Emissivity ,Ceramic ,Composite material ,Porosity ,Surfaces and Interfaces ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Cathode ,0104 chemical sciences ,Surfaces, Coatings and Films ,visual_art ,engineering ,visual_art.visual_art_medium ,0210 nano-technology ,Current density - Abstract
The purpose of this study is to prepare porous Zn-Ni coating with high infrared emissivity at a lower current density (1 A/cm2) by using dynamic hydrogen bubble template (DHBT) method. Three types of ceramic micro-particles (Al2O3, SiO2 and TiO2) are introduced into the electrolyte to investigate their effects on the surface morphology and infrared emissivity of Zn-Ni coating. The results show that uniform porous coatings can be obtained when these micro-particles are added into the electrolyte. The suspended micro-particles in electrolyte can prevent the H2 bubbles from rising up and escaping from the cathode, which is beneficial to the formation of porous structure, especially the insulating micro-particles, Al2O3 and SiO2. The uniform porous structure containing ceramic micro-particles is beneficial to improve infrared emissivity. In addition, the infrared emissivity of porous composite coating is also significantly dependents on the type of ceramic particles inside pores. Among the three types of micro-particles, TiO2 micro-particles have the greatest effect on the improvement of infrared emissivity which is increased from 0.83 to 0.91 when TiO2 micro-particles are deposited into the Zn-Ni coating.
- Published
- 2019
63. Indirect comparison of novel Oral anticoagulants among Asians with non-Valvular atrial fibrillation in the real world setting: a network meta-analysis
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Kai Wang, Bo Wang, Junnan Tang, Deliang Shen, Jian-Chao Zhang, Mengsen Bu, Jinying Zhang, Xiaolin Cui, Yan Bai, and Jiacheng Guo
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medicine.medical_specialty ,lcsh:Diseases of the circulatory (Cardiovascular) system ,Administration, Oral ,Hemorrhage ,030204 cardiovascular system & hematology ,Cochrane Library ,Non-valvular atrial fibrillation ,Risk Assessment ,Dabigatran ,03 medical and health sciences ,0302 clinical medicine ,Asian People ,Risk Factors ,Internal medicine ,Atrial Fibrillation ,medicine ,Humans ,030212 general & internal medicine ,Network meta-analysis ,Stroke ,Rivaroxaban ,business.industry ,Warfarin ,Anticoagulants ,Atrial fibrillation ,Novel Oral anticoagulants ,medicine.disease ,Treatment Outcome ,lcsh:RC666-701 ,Meta-analysis ,Apixaban ,Asian patients ,Cardiology and Cardiovascular Medicine ,business ,medicine.drug ,Research Article - Abstract
Background The development of novel oral anticoagulants (NOACs) has changed the landscape of non-valvular atrial fibrillation (NVAF) management. In this study, the effectiveness and the safety of several NOACs were evaluated in a real-world setting among Asian patients with NVAF. Methods The literature search was conducted crossing different databases including Embase, MEDLINE, and the Cochrane Library from inception through March 1, 2019, for studies which included real-world perspectives comparing the individual NOACs with each other or with warfarin among Asians with NVAF. The primary outcomes were defined as stroke or systemic embolism (SSE) and major bleeding; ischemic stroke, all-cause death as well as intracranial bleeding were classified as the secondary outcomes. Results From sixteen real-world studies, a total of 312,827 Asian patients were included in this analysis. In comparison with warfarin, the utilization of apixaban, dabigatran, and rivaroxaban significantly lowered the risk of major bleeding (apixaban: HR 0.47, 95%CI 0.35–0.63; dabigatran: HR 0.59, 95%CI 0.47–0.73; rivaroxaban: HR 0.66, 95%CI 0.52–0.83) and lessened the all-cause death rate (apixaban: HR 0.29, 95%CI 0.16–0.52; dabigatran: HR 0.40, 95%CI 0.27–0.60; rivaroxaban: HR 0.42, 95%CI 0.28–0.65). Apixaban (HR 0.59; 95%CI 0.40–0.85) reduced the possibility of ischemic stroke when compared against dabigatran. Rivaroxaban showed a higher chance of causing an ischemic stroke (HR 1.61; 95%CI 1.08–2.41) and major bleeding (HR 1.39; 95%CI 1.02–1.90) than Apixaban. Conclusions Apixaban, dabigatran and rivaroxaban were more effective than warfarin on reducing the risks of stroke and haemorrhage; meanwhile, apixaban was likely to lower the risk of major bleeding comparing to rivaroxaban. Trial registration PROSPERO registry number: CRD42018086914. Electronic supplementary material The online version of this article (10.1186/s12872-019-1165-5) contains supplementary material, which is available to authorized users.
- Published
- 2019
64. Robust and Flexible 3D Photothermal Evaporator with Heat Storage for High‐Performance Solar‐Driven Evaporation
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Yunzheng Liang, Jiacheng Guo, Jing‐Jing Li, Jian Mao, An‐Quan Xie, Liangliang Zhu, and Su Chen
- Subjects
Renewable Energy, Sustainability and the Environment ,General Environmental Science - Published
- 2022
65. Co-optimization of a novel distributed energy system integrated with hybrid energy storage in different nearly zero energy community scenarios
- Author
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Zhijian Liu, Ying Li, Guangyao Fan, Di Wu, Jiacheng Guo, Guangya Jin, Shicong Zhang, and Xinyan Yang
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General Energy ,Mechanical Engineering ,Building and Construction ,Electrical and Electronic Engineering ,Pollution ,Industrial and Manufacturing Engineering ,Civil and Structural Engineering - Published
- 2022
66. Adaptive Remote Sensing Image Attribute Learning for Active Object Detection
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Chunlei Huo, Nuo Xu, Yiwei Liu, Jian Wang, Chunhong Pan, and Jiacheng Guo
- Subjects
FOS: Computer and information sciences ,Image quality ,business.industry ,Computer science ,Deep learning ,Computer Vision and Pattern Recognition (cs.CV) ,Detector ,Computer Science - Computer Vision and Pattern Recognition ,Image processing ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Field (computer science) ,Object detection ,0202 electrical engineering, electronic engineering, information engineering ,Reinforcement learning ,020201 artificial intelligence & image processing ,Computer vision ,Artificial intelligence ,Active object ,business ,0105 earth and related environmental sciences - Abstract
In recent years, deep learning methods bring incredible progress to the field of object detection. However, in the field of remote sensing image processing, existing methods neglect the relationship between imaging configuration and detection performance, and do not take into account the importance of detection performance feedback for improving image quality. Therefore, detection performance is limited by the passive nature of the conventional object detection framework. In order to solve the above limitations, this paper takes adaptive brightness adjustment and scale adjustment as examples, and proposes an active object detection method based on deep reinforcement learning. The goal of adaptive image attribute learning is to maximize the detection performance. With the help of active object detection and image attribute adjustment strategies, low-quality images can be converted into high-quality images, and the overall performance is improved without retraining the detector., Comment: Accepted in 25th International Conference on Pattern Recognition (ICPR), (Milan, Italy), January 2021
- Published
- 2021
- Full Text
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67. The ZMYND8-regulated mevalonate pathway endows YAP-high intestinal cancer with metabolic vulnerability
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Junjie Peng, Jun Qin, Guoying Zhang, Minjia Tan, Tong Qiu, Huiyong Yin, Qilong Chen, Qintong Li, Yichuan Xiao, Huairui Yuan, Ying Han, Ni Li, Yaqi Li, Qiang Pan, Qiuli Liu, Xuege Wang, Jiacheng Guo, Yannan Lian, Jun Jiang, Hanling Wang, and Shanshan Zhong
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Colorectal cancer ,Mevalonic Acid ,Mice, Transgenic ,Biology ,03 medical and health sciences ,Mice ,0302 clinical medicine ,Mediator ,Cell Line, Tumor ,medicine ,Animals ,Epigenetics ,Molecular Biology ,030304 developmental biology ,Adaptor Proteins, Signal Transducing ,Zinc finger ,0303 health sciences ,Tumor Suppressor Proteins ,LGR5 ,YAP-Signaling Proteins ,Cell Biology ,medicine.disease ,Cancer research ,Mevalonate pathway ,Stem cell ,Colorectal Neoplasms ,030217 neurology & neurosurgery ,Biogenesis - Abstract
Cholesterol metabolism is tightly associated with colorectal cancer (CRC). Nevertheless, the clinical benefit of statins, the inhibitor of cholesterol biogenesis mevalonate (MVA) pathway, is inconclusive, possibly because of a lack of patient stratification criteria. Here, we describe that YAP-mediated zinc finger MYND-type containing 8 (ZMYND8) expression sensitizes intestinal tumors to the inhibition of the MVA pathway. We show that the oncogenic activity of YAP relies largely on ZMYND8 to enhance intracellular de novo cholesterol biogenesis. Disruption of the ZMYND8-dependent MVA pathway greatly restricts the self-renewal capacity of Lgr5+ intestinal stem cells (ISCs) and intestinal tumorigenesis. Mechanistically, ZMYND8 and SREBP2 drive the enhancer-promoter interaction to facilitate the recruitment of Mediator complex, thus upregulating MVA pathway genes. Together, our results establish that the epigenetic reader ZMYND8 endows YAP-high intestinal cancer with metabolic vulnerability.
- Published
- 2020
68. Small but significant: Insights and new perspectives of exosomes in cardiovascular disease
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Xiaolin Cui, Jian-Chao Zhang, Khoon S. Lim, Junnan Tang, Tim B. F. Woodfield, Bo Wang, Zeng-Lei Zhang, Jiacheng Guo, Jinying Zhang, Chang Cao, Deliang Shen, and Li Zhang
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0301 basic medicine ,Cellular functions ,Reviews ,cellular communication ,diagnostic ,Disease ,Cell Communication ,Review ,exosomes ,Bioinformatics ,Extracellular vesicles ,03 medical and health sciences ,Extracellular Vesicles ,0302 clinical medicine ,cardiovascular disease ,Medicine ,Animals ,Humans ,Disease treatment ,therapy ,Health professionals ,business.industry ,Mechanism (biology) ,Cell Biology ,Microvesicles ,030104 developmental biology ,Cardiovascular Diseases ,030220 oncology & carcinogenesis ,Cardiac repair ,Molecular Medicine ,business - Abstract
Cardiovascular diseases (CVDs) are a major health problem worldwide, and health professionals are still actively seeking new and effective approaches for CVDs treatment. Presently, extracellular vesicles, particularly exosomes, have gained its popularity for CVDs treatment because of their function as messengers for inter‐ and extra‐cellular communications to promote cellular functions in cardiovascular system. However, as a newly developed field, researchers are still trying to fully understand the role of exosomes, and their mechanism in mediating cardiac repair process. Therefore, a comprehensive review of this topic can be timely and favourable. In this review, we summarized the basic biogenesis and characterization of exosomes and then further extended the focus on the circulating exosomes in cellular communication and stem cell‐derived exosomes in cardiac disease treatment. In addition, we covered interactions between the heart and other organs through exosomes, leading to the diagnostic characteristics of exosomes in CVDs. Future perspectives and limitations of exosomes in CVDs were also discussed with a special focus on exploring the potential delivery routes, targeting the injured tissue and engineering novel exosomes, as well as its potential as one novel target in the metabolism‐related puzzle.
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- 2020
69. Myeloid-derived suppressor cells—new and exciting players in lung cancer
- Author
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Shuiling Jin, Wenxue Tang, Wang Ma, Lanling Weng, Jiacheng Guo, and Zhenzhen Yang
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0301 basic medicine ,Cancer Research ,medicine.medical_specialty ,Lung Neoplasms ,medicine.medical_treatment ,MDSCs ,Review ,lcsh:RC254-282 ,law.invention ,03 medical and health sciences ,0302 clinical medicine ,law ,Internal medicine ,Immune Tolerance ,Tumor Microenvironment ,medicine ,Animals ,Humans ,Lung cancer ,Molecular Biology ,Chemotherapy ,Hematology ,Antitumor immunity ,lcsh:RC633-647.5 ,business.industry ,Myeloid-Derived Suppressor Cells ,Immunosuppression ,lcsh:Diseases of the blood and blood-forming organs ,Immunotherapy ,lcsh:Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,medicine.disease ,Anticancer ,030104 developmental biology ,Oncology ,030220 oncology & carcinogenesis ,Cancer research ,Myeloid-derived Suppressor Cell ,Suppressor ,Tumor Escape ,business - Abstract
Lung cancer (LC) is the leading cause of cancer-related death worldwide due to its late diagnosis and poor outcomes. As has been found for other types of tumors, there is increasing evidence that myeloid-derived suppressor cells (MDSCs) play important roles in the promotion and progression of LC. Here, we briefly introduce the definition of MDSCs and their immunosuppressive functions. We next specifically discuss the multiple roles of MDSCs in the lung tumor microenvironment, including those in tumor growth and progression mediated by inhibiting antitumor immunity, and the associations of MDSCs with a poor prognosis and increased resistance to chemotherapy and immunotherapy. Finally, we also discuss preclinical and clinical treatment strategies targeting MDSCs, which may have the potential to enhance the efficacy of immunotherapy.
- Published
- 2020
70. An Accelerated Life Test and Reliability Evaluation Method on Ultrasonic Motors under Increased Torque Load
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Shouwen Liu, Jiacheng Guo, Tengfei Ma, Yun Jia, and Huang Shouqing
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Computer science ,Ultrasonic motor ,Evaluation methods ,Torque ,Life test ,Reliability (statistics) ,Automotive engineering - Published
- 2020
71. A novel distributed energy system combining hybrid energy storage and a multi-objective optimization method for nearly zero-energy communities and buildings
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Dekang Sun, Di Wu, Shicong Zhang, Jiacheng Guo, Lei Ai, Xinyan Yang, Guangyao Fan, Zhijian Liu, and Xianping Lin
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Carbon tax ,Computer science ,business.industry ,Mechanical Engineering ,Building and Construction ,Solar energy ,Thermal energy storage ,Pollution ,Multi-objective optimization ,Industrial and Manufacturing Engineering ,Energy storage ,Renewable energy ,General Energy ,Distributed generation ,Energy supply ,Electrical and Electronic Engineering ,business ,Process engineering ,Civil and Structural Engineering - Abstract
A distributed energy system (DES), which combines hybrid energy storage into fully utilized renewable energies, is feasible in creating a nearly zero-energy community. Improving the design, optimization, and operation of DESs is conducive to improving system performance. Therefore, a novel DES is proposed to combine a new solar energy utilization technology and hybrid energy storage (i.e., heat storage, ice storage, and electricity storage). In addition, a new operational strategy is put forward. Subsequently, based on nearly zero-energy community and buildings, the DES configuration is optimized in relation to its environment, economy, and net interaction. Its performance and operating characteristics are compared and analysed. Then, a new indicator is proposed to evaluate the potential of the DES to achieve zero-energy. Finally, a sensitivity analysis on the carbon tax, electricity price, and equipment price is carried out. The results show that the annual carbon emissions and net interaction of the novel DES are reduced by 51.7%–73.2% and 33.5%–63.6%, respectively, compared to the reference system. Herein, the nearly zero-energy office buildings have a better zero-energy potential at 91.1%. The novel DES and corresponding multi-objective optimization method can reference a nearly zero-energy community energy supply design.
- Published
- 2022
72. Study on Correlation of Physical and Mechanical Properties Indexex of Cohesive Soil in Hilly and Plain Region along the Yangtze River in Anhui Province
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Daoxiang Wu, Lei Ye, Huahong Zhao, Leilei Wu, Jiacheng Guo, and Bin Ji
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History ,Computer Science Applications ,Education - Abstract
In this paper, a large number of geotechnical engineering survey data are collected in hilly and plain region along the Yangtze River in Anhui Province. Based on the statistical analysis and calculation of the experimental data of physical and mechanical properties of cohesive soils (the main quaternary soil layers in the area), the correlation between the liquidity index and water content and other physical and mechanical properties indexes are analyzed, and the fitting regression is carried out respectively. The results show that the liquidity index (IL)) and water content (w) are highly correlated with cohesion (C), compression modulus (Es), compression coefficient (α), natural density (ρ), void ratio (e), and the regression equations have high goodness of fit and good fitting effect; In addition, the fitting regression equations of water content, void ratio and natural density are compared with the theoretical calculation formula, it is found that the calculation results are close, which proves that the fitting regression equations are reliable and can be used in engineering practice.
- Published
- 2022
73. Multi-objective optimization design and multi-attribute decision-making method of a distributed energy system based on nearly zero-energy community load forecasting
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Zhijian Liu, Xuan Liu, Peiwen Zhang, Shicong Zhang, Jiacheng Guo, Di Wu, Xinyan Yang, and Hua Ge
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Optimal design ,Mathematical optimization ,Computer science ,business.industry ,Mechanical Engineering ,Photovoltaic system ,TOPSIS ,Building and Construction ,Solar energy ,Pollution ,Multi-objective optimization ,Industrial and Manufacturing Engineering ,General Energy ,Distributed generation ,Energy supply ,Electrical and Electronic Engineering ,business ,Energy (signal processing) ,Civil and Structural Engineering - Abstract
Currently, many scholars have researched distributed energy systems (DES) from different dimensions. However, the load forecasting on both source-side and load-side, the optimal design of DES, and the multi-attribute decision making need further research. Therefore, a novel DES combining solar photovoltaic and hybrid energy storage is proposed. Combining the Monte Carlo method and improved K-means clustering is presented to predict the load on the source-side and load-side. Then, an optimal design method considering system independence and solar energy utilization scale is proposed, and the novel system is optimized. The entropy method and TOPSIS method are combined to make the multi-attribute decision on the optimization results of the system. The novel system is used to supply energy to nearly zero-energy communities (NZEC) in different scenarios. The research results show that the proposed load forecasting method can more accurately reflect the actual load demand of users. When “cost - external energy dependence - solar fraction” is taken as the target, the comprehensive energy import rate with nearly zero-energy office communities is only 36.7%, showing excellent independence. Finally, this paper can provide a method for load forecasting of NZECs, and provide certain theories for the optimization and decision-making of DESs.
- Published
- 2022
74. Recent Progress in Aryl Radical-Mediated Cyclization of Unsaturated Bonds Based on Aryldiazonium Salts
- Author
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Renjie Song, Xuanhui Ouyang, Yexiang Xie, Jinghao Qin, Jiacheng Guo, Jinghao He, Ning Nan, and Song Jiang
- Subjects
Organic Chemistry - Published
- 2022
75. Influence of sodium dodecyl sulphate on the surface morphology and infrared emissivity of porous Ni film
- Author
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Liming Peng, Jie Dong, Jiacheng Guo, Xingwu Guo, Nie Lewen, Jiyong Zeng, and Wenjiang Ding
- Subjects
Range (particle radiation) ,Morphology (linguistics) ,Materials science ,Infrared ,020209 energy ,Sodium ,chemistry.chemical_element ,02 engineering and technology ,Surface finish ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,chemistry ,Chemical engineering ,Volume (thermodynamics) ,0202 electrical engineering, electronic engineering, information engineering ,Emissivity ,0210 nano-technology ,Porosity - Abstract
The purpose of this study is to investigate the effect of sodium dodecyl sulphate (SDS) concentration on the surface morphology as well as infrared emissivity of porous Ni film prepared through the method of dynamic hydrogen bubble template (DHBT). The results indicate that the addition of SDS can enhance the hydrogen evolution reaction and increase the volume of evolving hydrogen bubbles during electrodeposition process, resulting in the increase of pore density, depth and diameter of Ni film. These factors affect the roughness greatly and the relationship between roughness and infrared emissivity has been inferred. A wide range of infrared emissivity (0.36–0.80) of porous Ni film was obtained through control of the concentration of SDS. It is concluded that the addition of SDS has a significant effect on the improvement of roughness of the porous Ni film and is beneficial for the film to obtaining high thermal emission.
- Published
- 2018
76. Circularly Polarized Retrodirective Array for Far-Field Wireless Power Transfer
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Jiacheng Guo, Sanming Hu, and Jun Wang
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Physics ,Imagination ,business.industry ,media_common.quotation_subject ,020208 electrical & electronic engineering ,Electrical engineering ,Process (computing) ,020206 networking & telecommunications ,Near and far field ,02 engineering and technology ,Circularly polarized antenna ,0202 electrical engineering, electronic engineering, information engineering ,Wireless power transfer ,Phase conjugation ,business ,media_common - Abstract
In this paper, a circularly polarized retrodirective array for far field wireless power transfer (WPT) is presented. By using phase conjugation, the retransmitted wave can adjust the direction to the source automatically. A receiver is also used to show the WPT process. From the experiment, the proposed system can be a good candidate for WPT applications.
- Published
- 2019
77. A new collaborative optimization method for a distributed energy system combining hybrid energy storage
- Author
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Hua Ge, Shicong Zhang, Peiwen Zhang, Jiacheng Guo, Xinyan Yang, Zhijian Liu, and Di Wu
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Supercapacitor ,Renewable Energy, Sustainability and the Environment ,Computer science ,business.industry ,Geography, Planning and Development ,Transportation ,Thermal energy storage ,Automotive engineering ,Reduction (complexity) ,Filter (video) ,Distributed generation ,Hybrid system ,business ,Operating cost ,Civil and Structural Engineering ,Efficient energy use - Abstract
The application of hybrid energy storage to distributed energy systems can significantly improve energy efficiency and reduce the investment operating cost of the system. However, inadequate efforts are found focusing on the investigation of the integration of the two systems and optimization configuration and operation strategy of systems. Therefore, a novel distributed energy system combining hybrid energy storage was proposed, and the system optimization configuration and operation strategy of the novel system were considered simultaneously. The hybrid system contained heat storage and two power storage forms, i.e., supercapacitors and lithium battery. The influence of hybrid energy storage on distributed energy systems was fully considered. Subsequently, a two-layer collaborative optimization method for the novel system considering energy efficiency, economy, and environmental protection was presented. The novel system was applied to a nearly zero-energy community. The results indicate that the primary energy-saving and pollutant equivalent emission reduction rates of the novel system are evaluated to be 54.8% and 63.6%, respectively, under the low-pass filter operation strategy combined with the secondary feedback adjustment of the supercapacitor charge state. The system configuration and operation strategy can be optimized simultaneously by the two-layer collaborative optimization method.
- Published
- 2021
78. Dysregulation of miR-342-3p in plasma exosomes derived from convalescent AMI patients and its consequences on cardiac repair
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Chang Cao, Yunzhe Wang, Zeng-Lei Zhang, Jian-Chao Zhang, Qian-Qian Guo, Deliang Shen, Jing Bai, Jin-Ying Zhang, Bo Wang, Jiacheng Guo, Dongjian Han, Junnan Tang, and Demin Li
- Subjects
Adult ,Male ,Cardiotonic Agents ,Cell Survival ,media_common.quotation_subject ,Myocardial Infarction ,Down-Regulation ,Apoptosis ,Acute myocardial infarction ,RM1-950 ,Exosomes ,Cell Line ,Rats, Sprague-Dawley ,Cardiac repair ,In vivo ,Autophagy ,medicine ,Animals ,Humans ,Myocytes, Cardiac ,cardiovascular diseases ,Myocardial infarction ,media_common ,Pharmacology ,Biological Products ,MiR-342-3p ,Basic Helix-Loop-Helix Leucine Zipper Transcription Factors ,business.industry ,Convalescence ,Hydrogen Peroxide ,General Medicine ,Middle Aged ,medicine.disease ,Microvesicles ,In vitro ,Disease Models, Animal ,MicroRNAs ,Cancer research ,TFEB ,Female ,Therapeutics. Pharmacology ,business ,SOXD Transcription Factors - Abstract
Plasma exosomes derived from healthy people have been shown to be beneficial in terms of protecting against ischemia-reperfusion injury or acute myocardial infarction (AMI). However, a pathological condition may severely affect the constitution and biological activity of exosomes. In our study, we isolated plasma exosomes from healthy volunteers and convalescent AMI patients (3–7 d after onset). Compared to exosomes from healthy controls (Nor-Exo), exosomes from convalescent AMI patients (AMI-Exo) exhibited an impaired ability to repair damaged cardiomyocytes both in vitro and in vivo. miRNA sequencing and PCR analysis indicated that miR-342-3p was significantly downregulated in AMI-Exo. Moreover, miR-342-3p alleviated H2O2-induced injury and reduced apoptosis and autophagy in H9c2 cardiomyocytes, while in vivo restoration of miR-342-3p expression enhanced the reparative function of AMI-Exo. Further mechanistic studies revealed that the SOX6 and TFEB genes were two direct and functional targets of miR-342-3p. Taken together, during the early convalescent phase after AMI, dysregulated miR-342-3p in plasma exosomes might be responsible for their impaired cardioprotective potential. miR-342-3p contributed to exosome-mediated heart repair by inhibiting cardiomyocyte apoptosis and autophagy through targeting SOX6 and TFEB, respectively. Our work provided novel insights on the role of plasma exosomes in the natural process of cardiac repair after AMI and suggestions for therapy development.
- Published
- 2021
79. Multi-scenario analysis and collaborative optimization of a novel distributed energy system coupled with hybrid energy storage for a nearly zero-energy community
- Author
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Ying Li, Di Wu, Jiacheng Guo, Zeping Cai, Zhijian Liu, Hua Ge, Shicong Zhang, and Xinyan Yang
- Subjects
Renewable Energy, Sustainability and the Environment ,business.industry ,Computer science ,Photovoltaic system ,Volume (computing) ,Energy Engineering and Power Technology ,Systems modeling ,Automotive engineering ,Reduction (complexity) ,Distributed generation ,Energy supply ,Scenario analysis ,Electrical and Electronic Engineering ,business ,Energy (signal processing) - Abstract
Coupling electric vehicles (EV) and hybrid energy storage (HES) with the distributed energy system (DES) can improve energy-saving and emission reduction efficiency and reduce system investment operating costs. However, the system modeling, optimization design, application site, and comprehensive performance analysis of the novel DES need to be further studied. Therefore, this paper combines photovoltaic technology, HES with P2G technology, and EVs with DESs to form a DES that combines HES. Taking the annual net energy import volume and annual cost as targets, a two-layer collaborative optimization method considering both system optimal configuration and operation strategy is used. The novel system will be used to supply energy to a nearly zero-energy community. The influence of various parameters is discussed through parameter analysis. The results show that under the operation strategy in charging during the daytime, the annual net energy import and annual value cost of the novel system are 2170772 kWh and 2272786 yuan, respectively; compared with the multi-parameter collaborative optimization method, it decreased by 3.1% and 5.0%, respectively. Finally, the two-layer collaborative optimization method of this paper is also applicable to the collaborative optimization design of other complex energy systems. The proposed operation strategy is also suitable for other energy systems with source, load, and storage.
- Published
- 2021
80. Discrete element simulation and parameter selection about triaxial test of cohesive soil containing calcareous nodules
- Author
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Monong, Ba, primary, Daoxiang, Wu, additional, Lei, Ye, additional, and Jiacheng, Guo, additional
- Published
- 2019
- Full Text
- View/download PDF
81. A Zn-Ni coating with both high electrical conductivity and infrared emissivity prepared by hydrogen evolution method
- Author
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Jie Dong, Wenjiang Ding, Liming Peng, Wenbin Xu, Jiacheng Guo, Xingwu Guo, and Zhicheng Zhang
- Subjects
Materials science ,Infrared ,General Physics and Astronomy ,02 engineering and technology ,engineering.material ,010402 general chemistry ,01 natural sciences ,Optics ,Coating ,Electrical resistivity and conductivity ,Emissivity ,Composite material ,Porosity ,business.industry ,Bond strength ,Non-blocking I/O ,Surfaces and Interfaces ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,0104 chemical sciences ,Surfaces, Coatings and Films ,Projected area ,engineering ,0210 nano-technology ,business - Abstract
A Zn-Ni coating with both high electrical conductivity and infrared emissivity was prepared by hydrogen evolution method in order to satisfy the demand of thermal control in space. The maximum infrared emissivity of 0.91 was obtained, meanwhile the electrical resistivity is lower than 0.01 mΩ/cm. The infrared emissivity of the coating obtained from the experimental result is proportional to the projected area of pores per unit area in the coating. The addition of NH4SCN in the bath can obviously increase the projected area of pores per unit area in the coating and lead to the formation of NiO and ZnO compounds, which further increase the infrared emissivity of the coating. The porous hierarchical structure of Zn-Ni coating can further improve the infrared emissivity, and the infrared emissivity can be tuned by changing the projected area of pores in the coating. Based on the experimental results, a mathematical relationship between infrared emissivity and the projected area of pores per unit area is established. The bond strength and the mass of volatiles of the design of coatings satisfy the technical standard demanded by the satellites in space.
- Published
- 2017
82. On the primary structure of polysilenes and polygermenes
- Author
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Joe B. Gilroy, Bahareh Farhadpour, Jiacheng Guo, Douglas W. Hairsine, and Kim M. Baines
- Subjects
chemistry.chemical_classification ,Polymers and Plastics ,010405 organic chemistry ,Alkene ,Silenes ,Organic Chemistry ,technology, industry, and agriculture ,Bioengineering ,Polymer ,010402 general chemistry ,01 natural sciences ,Biochemistry ,0104 chemical sciences ,chemistry.chemical_compound ,End-group ,Chemistry ,Anionic addition polymerization ,chemistry ,Intramolecular force ,Polymer chemistry ,Addition polymer ,Heteronuclear single quantum coherence spectroscopy - Abstract
Despite the long history and prominence of addition polymerizations in alkene chemistry, addition polymerizations of the heavier main group analogs of alkenes are in their infancy. Herein, the detailed structural and end group analyses of polysilenes (polycarbosilanes) and polygermenes (polycarbogermanes) derived from the anionic polymerization of kinetically-stabilized silenes and germenes, respectively, are reported. The end groups were identified using ESI-TOF mass spectrometry. Careful examination of the C- H HSQC NMR spectra of both polymers confirmed the regular, alternating structure consistent with an addition polymerization with no significant amount of intramolecular rearrangement or back-biting. These results are in contrast to what has been observed during the synthesis of the analogous polyphosphenes. 13 1
- Published
- 2019
83. Additional file 5: of Indirect comparison of novel Oral anticoagulants among Asians with non-Valvular atrial fibrillation in the real world setting: a network meta-analysis
- Author
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Jianchao Zhang, Junnan Tang, Xiaolin Cui, Wang, Bo, Mengsen Bu, Bai, Yan, Wang, Kai, Jiacheng Guo, Deliang Shen, and Jinying Zhang
- Abstract
Table S2. Evidence Quality Assessment in the Included Studies. (DOCX 21 kb)
- Published
- 2019
- Full Text
- View/download PDF
84. Two-phase collaborative optimization and operation strategy for a new distributed energy system that combines multi-energy storage for a nearly zero energy community
- Author
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Guangyao Fan, Zhijian Liu, Di Wu, Shicong Zhang, Jiacheng Guo, Xinyan Yang, and Hua Ge
- Subjects
business.product_category ,Primary energy ,Renewable Energy, Sustainability and the Environment ,business.industry ,Computer science ,020209 energy ,Energy Engineering and Power Technology ,02 engineering and technology ,Automotive engineering ,Energy storage ,Renewable energy ,Fuel Technology ,020401 chemical engineering ,Nuclear Energy and Engineering ,Distributed generation ,Electric vehicle ,0202 electrical engineering, electronic engineering, information engineering ,Energy supply ,0204 chemical engineering ,business ,Energy (signal processing) ,Efficient energy use - Abstract
The combination of a distributed energy system and multi-energy storage system has the potential to use renewable energy on a large scale and to further improve the system’s energy efficiency. Therefore, a new type of distributed energy system that combines multi-energy storage is proposed in this paper. Its novelty is that the three types of energy storage, i.e., cold, heat and electricity, are considered simultaneously, and the electric vehicle load is also included in the distributed energy system in combination with the multi-energy storage system, which allows full consideration of the effect of multi-energy storage on the distributed energy system. Three operation modes are proposed to give full play to the advantages of the new system according to the charging mode for electric vehicles. Subsequently, a two-phase collaborative optimization method for system configuration and operation optimization is proposed, and it is applied to a nearly zero energy community. The results show that the primary energy savings rate of the distributed energy system that combines multi-energy storage is 53.5% when the electric vehicle charging load is provided by the new system, which is 17.5% higher than that of the traditional distributed energy system, while the annual cost savings rate increased by only 8.3%. In addition, the hourly operating cost of the distributed energy system that combines multi-energy storage is also significantly reduced compared with the separated production system. Therefore, the method of two-phase collaborative optimization in the new system proposed in this paper can be used to realize the optimal system configuration and operation design for energy savings and consumption reduction. Finally, the new system can provide a feasible scheme for the energy supply of a nearly zero energy community in the future.
- Published
- 2021
85. Thymosin alpha-1 blocks the accumulation of myeloid suppressor cells in NSCLC by inhibiting VEGF production
- Author
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Yabing Du, Xiaojing Shi, Huan Zhao, Kang Cui, Shuiling Jin, Lili Zhu, Wenxue Tang, Wang Ma, Zhenzhen Yang, Jiancheng Guo, Lanling Weng, Jiacheng Guo, Hong Zong, and Tengfei Zhang
- Subjects
Vascular Endothelial Growth Factor A ,0301 basic medicine ,Lung Neoplasms ,Thymalfasin ,Cell ,Apoptosis ,RM1-950 ,Non-small cell lung carcinoma ,Flow cytometry ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Downregulation and upregulation ,Cell Movement ,Carcinoma, Non-Small-Cell Lung ,medicine ,Animals ,Humans ,Thymosin alpha-1 ,Pharmacology ,Mice, Inbred BALB C ,Tumor microenvironment ,medicine.diagnostic_test ,Chemistry ,Myeloid-Derived Suppressor Cells ,Thymosin ,General Medicine ,VEGF ,Vascular endothelial growth factor ,030104 developmental biology ,medicine.anatomical_structure ,A549 Cells ,030220 oncology & carcinogenesis ,Cell Migration Inhibition ,Cancer research ,Myeloid-derived Suppressor Cell ,Female ,Therapeutics. Pharmacology - Abstract
Background Thymosin alpha-1 (TA) has been reported to inhibit tumor growth as an immunomodulator. However, its mechanism of action in immunosuppressive cells is unclear. The purpose of this study was to investigate whether TA can reshape the immune microenvironment by inhibiting the function of myeloid-derived suppressor cells (MDSCs) in non-small cell lung carcinoma (NSCLC). Methods The effects of TA on peripheral blood monocytic MDSCs (M-MDSCs) in patients with NSCLC and on the apoptosis and migration of M-MDSCs were studied. A mouse subcutaneous xenograft tumor model was constructed, and the effect of TA on M-MDSC migration was evaluated. Quantitative real-time PCR, Western blotting, flow cytometry and immunohistochemistry were used to examine the mechanism by which TA affects M-MDSCs. Results TA not only promoted the apoptosis of M-MDSCs by reducing the Bcl-2/BAX ratio but also and more importantly inhibited the migration of MDSCs to the tumor microenvironment by suppressing the production of vascular endothelial growth factor (VEGF) through the downregulation of hypoxia-inducible factor (HIF)-1α in tumor cells. Conclusions TA may have a novel antitumor effect mediated by decreasing M-MDSC accumulation in the tumor microenvironment through reduced VEGF production.
- Published
- 2020
86. Effects of glycine and current density on the mechanism of electrodeposition, composition and properties of Ni–Mn films prepared in ionic liquid
- Author
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Zhicheng Zhang, Liming Peng, Wenjiang Ding, Jiacheng Guo, Xingwu Guo, Jie Dong, and Shaohua Wang
- Subjects
Materials science ,020209 energy ,Inorganic chemistry ,General Physics and Astronomy ,02 engineering and technology ,Surfaces and Interfaces ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Microstructure ,Surfaces, Coatings and Films ,Corrosion ,Cathodic protection ,Ion ,chemistry.chemical_compound ,chemistry ,Glycine ,Ionic liquid ,0202 electrical engineering, electronic engineering, information engineering ,0210 nano-technology ,Dissolution ,Current density - Abstract
The effects of glycine on the mechanism of electrodeposition of Ni–Mn alloy film prepared in ChCl–urea ionic liquid were studied in order to control the composition, microstructure and properties of the film. The cyclic voltammograms revealed that the presence of glycine in the ionic liquid can inhibit the reduction of Ni 2+ ions but promote the reduction of Mn 2+ ions in the cathodic scan. However, it promoted the dissolution of both Ni and Mn deposits in the ChCl–urea ionic liquids during the reverse scan. Glycine changed the mode of Ni–Mn film growth from Volmer–Weber mode into Stranski–Krastanov mode. The Mn content in the Ni–Mn film increased with the increase of concentration of glycine and current density. The Ni–Mn alloy film with 3.1 at.% Mn exhibited the lowest corrosion current density of 3 × 10 −7 A/cm 2 compared with other films prepared and exhibited better corrosion resistance than pure Ni film in 3.5 wt.% NaCl solution.
- Published
- 2016
87. A Data Oriented Analysis and Design Method for Smart Complex Software Systems of IoT
- Author
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Yu Wang, DJ Ning, and Jiacheng Guo
- Subjects
business.industry ,Computer science ,Master data ,Cascading Style Sheets ,Data model ,Data exchange ,Smart city ,Software system ,Software engineering ,business ,Software analysis pattern ,Design methods ,computer ,computer.programming_language - Abstract
Nowadays, with the rapid development of the Internet of things (IoT) technology, various smart complex software systems (Smart CSS) are becoming important software paradigms for realizing the integration of human-cyber-physical ternary world. However, the characteristics of Smart CSS, including members heterogeneous, boundary openness, behavioral emergence, and continuous evolution, make the existing software analysis and design methods difficult to adapt to their development requirements. This paper proposed a data oriented analysis and design (DOAD) method for Smart CSS of IoT. It focuses on data closed loop of perception - analysis - decision - execution, including basic digital virtual objects (VO) data model design, the metadata design and standard for data exchange and catalog management, and the design of subject domain master data model. Through the implementation of DOAD Framework and its practice in the Smart CSS analysis and design of Smart City, it is demonstrated that this method can effectively help the development team to solve the existing data island and system silos problems, and improve the complexity management capability and resources reusability of the design team. In the future, we will continue to optimize it in practice by applying the DOAD method to the analysis and design of more Smart CSS of IoT.
- Published
- 2018
88. Kurtosis CFAR detection for indoor positioning applications with FMCW systems
- Author
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Zhizhang David Chen and Jiacheng Guo
- Subjects
Radar tracker ,Channel (digital image) ,Computer science ,business.industry ,Tracking system ,law.invention ,Constant false alarm rate ,symbols.namesake ,Additive white Gaussian noise ,Fourth order ,law ,Kurtosis ,symbols ,Radar ,business ,Algorithm - Abstract
Frequency modulated continuous wave (FMCW) radar technique has been widely used in tracking system, e.g., WiTrack System. In this paper, based on fourth order statistic, i.e., Kurtosis (KD), we propose a non-coherent CFAR detection method for FMCW indoor positioning. We develop mathematical model, investigate impacts of parameters and conduct performance evaluations. Our results show the proposed Kurtosis based detection outperforms the conventional FMCW detection technique under additive white Gaussian noise (AWGN), line-of-sight (LOS) and non-line-of-sight channel conditions. The detection probability with the proposed method can be twice better than the conventional method.
- Published
- 2018
89. The Detection Methods of Differential Item Functioning Based on the IRT Framework: Research Status and Challenges
- Author
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Hao, Yin, primary, Jiacheng, Guo, additional, Hejun, Zhao, additional, and Zhiwei, Liu, additional
- Published
- 2019
- Full Text
- View/download PDF
90. The influences of controlling sintering mechanism on electrical properties of multilayer PTCR chip
- Author
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Jiacheng Guo, Zhao Yang, Zhang Li, Yang Huai, Yang Yan, Chen Yong, and Huang Hanhua
- Subjects
Materials science ,Cooling rate ,Electrical resistivity and conductivity ,visual_art ,visual_art.visual_art_medium ,Sintering ,Curie temperature ,General Materials Science ,Ceramic ,Composite material ,Chip ,Casting ,Holding time - Abstract
Experiments were designed to investigate the influence of controlling sintering mechanism on electrical properties of multilayer PTCR chip. During the preparation process, heating rate, sintering temperature, high-temperature holding time and cooling method were respectively regulated to prepare multilayer PTCR chip with good performance. After the process of organic casting, the casting PTCR green films were sintered at 1 260-1 280 °C for 0.5 h at reduction atmosphere, which was heated at the rate of 400 °C/h. Then selecting 300 °C/h as the cooling rate, the ceramics were oxidated at 850 °C for 1 h. The prepared multilayer PTCR chips exhibited room temperature resistivity of below 100 Ω·cm, and resistance rising rate more than 104 unit through the Curie temperature.
- Published
- 2015
91. Homogenization pretreatment and electroless Ni–P plating on AZ91D magnesium alloy
- Author
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Wenjiang Ding, Shaohua Wang, Can Sun, Jiacheng Guo, and Xingwu Guo
- Subjects
Materials science ,Electroless nickel plating ,Metallurgy ,Metals and Alloys ,Nucleation ,engineering.material ,Geotechnical Engineering and Engineering Geology ,Condensed Matter Physics ,Microstructure ,Corrosion ,Dielectric spectroscopy ,Coating ,Chemical engineering ,Materials Chemistry ,engineering ,Adhesive ,Magnesium alloy - Abstract
Electroless nickel plating on AZ91D substrate with a new and eco-friendly pretreatment process based on tuning an electrochemical homogeneous surface was investigated. The morphology, deposition process, chemical composition and microstructure of Ni–P coating were studied. It is indicated that β phases are selectively removed, producing a microstructural homogeneous surface and the subsequent uniform and compact Zn immersion layer. A defect-free and well adhesive Ni–P coating can be successfully obtained due to its uniform nucleation and growth based on such pretreatment. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests reveal that Ni–P coating could significantly improve the corrosion resistance of AZ91D substrate.
- Published
- 2014
92. Research on optimization design of UAV main propulsion motor based on Particle Swarm Optimization algorithm
- Author
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Jiacheng Guo, Xiang Song, Yangyang Zhao, Wang Sen, Yufeng Li, and Jin Huang
- Subjects
Nonlinear system ,Continuous function ,Computer science ,020209 energy ,Convergence (routing) ,0202 electrical engineering, electronic engineering, information engineering ,Torque density ,Particle swarm optimization ,Algorithm design ,02 engineering and technology ,Propulsion ,Multi-swarm optimization ,Algorithm - Abstract
UAV main propulsion motor is required the small mass and Colliers energy density (torque density and power density), so it needs more optimal motor to achieve the purpose. The constraint condition of the main propulsion motor is a complex nonlinear continuous function, and the general Particle Swarm Optimization (PSO) algorithm is used to solve the problem when the multiple objectives are converted into different weights, and then converted to a single target for processing. And the weight of different targets is given based on experience, but the weight of the new motor is often difficult to determine the weight. In this paper, a new particle swarm optimization algorithm is proposed, which can optimize the two sub populations, and then exchange the optimal solutions of the two subgroups. Experiments show that this algorithm is applicable to main propulsion motor quality and efficiency of optimization, and the optimization results and general algorithm are compared. It is proved that the algorithm has high accuracy and fast convergence speed and is suitable for solving the similar problems.
- Published
- 2016
93. Addition of Organometallic Reagents to a Stable Silene and Germene
- Author
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Bahareh Farhadpour, Jiacheng Guo, Laura C. Pavelka, and Kim M. Baines
- Subjects
Silene ,biology ,Chemistry ,Silenes ,Potassium ,Organic Chemistry ,chemistry.chemical_element ,biology.organism_classification ,Inorganic Chemistry ,chemistry.chemical_compound ,Polymerization ,Yield (chemistry) ,Reagent ,Organic chemistry ,Reactivity (chemistry) ,Physical and Theoretical Chemistry ,Diethyl ether - Abstract
A variety of alkyllithium (R = Me, Bu, t-Bu) reagents and potassium tert-butoxide were added to the highly reactive silene Mes2Si=CHCH2t-Bu (1) and the germene Mes2Ge=CHCH2t-Bu (4) in diethyl ether. 1,2-Addition products were obtained regioselectively and in good yield after treatment with a weak acid with no evidence for any rearrangement products and no polymerization observed. The reactivity of the silene 1 and germene 4 toward organometallic reagents is compared to previous studies of analogous silenes and germenes. (Chemical Equation Presented).
- Published
- 2015
94. Addition of nitromethane to a disilene and a digermene: comparison to surface reactivity and the facile formation of 1,3,2-dioxazolidines
- Author
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Frederick Parsons, Kim M. Baines, Nada Y. Tashkandi, and Jiacheng Guo
- Subjects
Nitromethane ,Surface reactivity ,Digermene ,General Medicine ,General Chemistry ,Ring (chemistry) ,Oxime ,Photochemistry ,Catalysis ,Cycloaddition ,Dioxazadisilolidines ,chemistry.chemical_compound ,Disilene ,chemistry - Abstract
The addition of nitromethane to tetramesityldisilene and tetramesityldigermene leads to the formation of the novel 1,3,2,4,5-dioxazadisil- and digermolidine ring systems, respectively. The 1,3,2,4,5-dioxazadisilolidine isomerizes to the 1,4,2,3,5-dioxazadisilolidine ring system, whereas the 1,3,2,4,5-dioxazadigermolidine undergoes ring opening to the isomeric oxime. The preferential formation of the 1,3,2,4,5-dioxazadisilolidine, and its rearrangement to a 1,4,2,3,5-dioxazadisilolidine, provides support for the suggested reaction pathway between nitromethane and the Si(100) 2×1 reconstructed surface.
- Published
- 2014
95. Host-guest interaction of chaperonin GroEL and water-soluble CdTe quantum dots and its size-selective inclusion
- Author
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Jicun Ren, Liwen Shao, Jiacheng Guo, and Chaoqing Dong
- Subjects
Time Factors ,Surface Properties ,Fluorescence spectrometry ,Fluorescence correlation spectroscopy ,Fluorescence spectroscopy ,Chaperonin ,Inclusion compound ,chemistry.chemical_compound ,Quantum Dots ,Cadmium Compounds ,Physical and Theoretical Chemistry ,Particle Size ,chemistry.chemical_classification ,Chemistry ,Biomolecule ,technology, industry, and agriculture ,Electrophoresis, Capillary ,Water ,Chaperonin 60 ,equipment and supplies ,GroEL ,Atomic and Molecular Physics, and Optics ,enzymes and coenzymes (carbohydrates) ,Crystallography ,Spectrometry, Fluorescence ,Solubility ,Quantum dot ,biological sciences ,Biophysics ,bacteria ,Tellurium - Abstract
Some nanoparticles, such as quantum dots (QDs), are widely used in the biological and biomedical fields due to their unique optical properties. However, little is currently known about the interaction between these nanoparticles and biomolecules. Herein, we systemically investigated the interaction between chaperonin GroEL and water-soluble CdTe QDs based on fluorescence correlation spectroscopy (FCS), capillary electrophoresis, and fluorescence spectrometry. We observed that some water-soluble CdTe QDs were able to enter the inner cavity of GroEL and formed an inclusion complex after the activation of chaperonin GroEL with ATP. The inclusion of GroEL was size-selective to QDs and only small QDs were able to enter the inner cavity. The inclusion could suppress the fluorescence quenching of the QDs. Meanwhile, we evaluated the association constant between chaperonin GroEL and CdTe QDs by FCS. Our results further demonstrated that FCS was a very useful tool for study of the interaction of QDs and biomolecules.
- Published
- 2008
96. Addition of Organometallic Reagents to a Stable Sileneand Germene.
- Author
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Bahareh Farhadpour, Jiacheng Guo, Laura C. Pavelka, and Kim M. Baines
- Subjects
- *
ORGANOMETALLIC chemistry , *CHEMICAL reagents , *CHEMICAL stability , *REARRANGEMENTS (Chemistry) , *POLYMERIZATION - Abstract
A variety of alkyllithium (R = Me,Bu, t-Bu) reagentsand potassium tert-butoxide were added to the highlyreactive silene Mes2SiCHCH2t-Bu (1) and the germene Mes2GeCHCH2t-Bu (4) in diethyl ether. 1,2-Additionproducts were obtained regioselectively and in good yield after treatmentwith a weak acid with no evidence for any rearrangement products andno polymerization observed. The reactivity of the silene 1and germene 4toward organometallic reagents is comparedto previous studies of analogous silenes and germenes. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
97. Addition of Nitromethane to a Disilene and a Digermene: Comparison to Surface Reactivity and the Facile Formation of 1,3,2-Dioxazolidines.
- Author
-
Tashkandi, Nada Y., Parsons, Frederick, Jiacheng Guo, and Baines, Kim M.
- Subjects
NITROMETHANE ,DISILENES ,REACTIVITY (Chemistry) ,RING formation (Chemistry) ,OXAZOLIDINES ,GERMANIUM compounds ,OXIMES ,RING-opening reactions - Abstract
The addition of nitromethane to tetramesityldisilene and tetramesityldigermene leads to the formation of the novel 1,3,2,4,5-dioxazadisil- and digermolidine ring systems, respectively. The 1,3,2,4,5-dioxazadisilolidine isomerizes to the 1,4,2,3,5-dioxazadisilolidine ring system, whereas the 1,3,2,4,5-dioxazadigermolidine undergoes ring opening to the isomeric oxime. The preferential formation of the 1,3,2,4,5- dioxazadisilolidine, and its rearrangement to a 1,4,2,3,5-dioxazadisilolidine, provides support for the suggested reaction pathway between nitromethane and the Si(100) 2 1 reconstructed surface. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
98. Characterization of highly corrosion-resistant nanocrystalline Ni coating electrodeposited on Mg-Nd-Zn-Zr alloy from a eutectic-based ionic liquid.
- Author
-
Xingwu Guo, Shaohua Wang, Jia Gong, Jiacheng Guo, Liming Peng, and Wenjiang Ding
- Subjects
- *
NICKEL alloys , *NANOCRYSTALS , *METAL coating , *CORROSION resistance , *ELECTROFORMING , *ZINC alloys , *EUTECTIC alloys , *IONIC liquids - Abstract
A dense nanocrystalline Ni coating was successfully electrodeposited on Mg-3.0Nd-0.2Zn-0.4Zr (wt.%, NZ30K) alloy from a choline chloride-urea (1:2 molar ratio) eutectic-based ionic liquid (1:2 ChCl-urea IL) on the basis of an appropriate pretreatment. A Cu underlayer was pre-plated from a pyrophosphate based solution to avoid the severe corrosion and replacement reaction of NZ30K alloy in the IL electrolyte. The evolution of surface morphologies, compositions and phase structures of the pretreatment films and Ni coating were studied in detail. The uniform, smooth and dense nanocrystalline Ni coating possessing good adhesion to substrate has been proved by thermal shock test. Potentiodynamic polarization test in 3.5 wt.% NaCl solution showed that the Ni coating significantly improved the corrosion resistance of NZ30K alloy by nearly two orders of magnitude. Open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) during long-term immersion test further demonstrated that the Cu/Ni coating could provide an effective protection for NZ30K alloy from corrosion up to ~336 h. The high corrosion resistance of the coating can be attributed to the dense nanocrystalline Ni structure and the synergistic effect of electrochemical protection between Ni coating and Cu underlayer. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
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