134 results on '"Zhihong He"'
Search Results
2. Data-driven active corrective control in power systems: an interpretable deep reinforcement learning approach
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Beibei Li, Qian Liu, Yue Hong, Yuxiong He, Lihong Zhang, Zhihong He, Xiaoze Feng, Tianlu Gao, and Li Yang
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power systems ,active corrective control ,deep reinforcement learning ,feature importance explainability method ,explainable artificial intelligence ,General Works - Abstract
With the successful application of artificial intelligence technology in various fields, deep reinforcement learning (DRL) algorithms have applied in active corrective control in the power system to improve accuracy and efficiency. However, the “black-box” nature of deep reinforcement learning models reduces their reliability in practical applications, making it difficult for operators to comprehend the decision-making mechanism. process of these models, thus undermining their credibility. In this paper, a DRL model is constructed based on the Markov decision process (MDP) to effectively address active corrective control issues in a 36-bus system. Furthermore, a feature importance explainability method is proposed, validating that the proposed feature importance-based explainability method enhances the transparency and reliability of the DRL model for active corrective control.
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- 2024
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3. The efficacy of immune checkpoint inhibitors on low PD‐L1 cervical cancer: A meta‐analysis
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Wutao Chen, Nan Zhang, Zhihong He, Qing Li, You Wang, Weihua Lou, and Wen Di
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cervical cancer ,chemotherapy ,immune checkpoint inhibitor ,immunotherapy ,meta‐analysis ,prognosis ,Medicine - Abstract
Abstract Background and Aims The effectiveness of immune checkpoint inhibitors (ICIs) in low programmed death ligand 1 (PD‐L1) expression in cervical cancer (CC) patients remains unknown. We aimed to evaluate the efficacy of ICIs in low PD‐L1 expression CC patients. Methods The study is an individual patient data (IPD)‐based meta‐analysis. IPD were compiled through KMSubtraction and IPDfromKM methodologies from high‐quality randomized clinical trials and single‐arm studies which reported overall survival (OS) or progression‐free survival (PFS) stratified by PD‐L1 expression. Kaplan−Meier curves and Cox regression analysis were employed to evaluate the survival benefits of ICIs. Results A total of eight studies and 1110 cases were included in the analysis. Within the low PD‐L1 expression subgroup, ICI combination therapy, but not ICI monotherapy, demonstrated significant OS benefits over non‐ICI treatment (hazard ratio [HR] = 0.61, 95% confidence interval [CI]: 0.36−1.04, p = 0.06). Concerning PFS, ICI monotherapy was associated with a negative effect compared to non‐ICI treatment (HR = 4.59, 95% CI: 2.32−9.07, p
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- 2024
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4. Metagenomic insights into the response of soil microbial communities to pathogenic Ralstonia solanacearum
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Yansong Xiao, Sai Zhang, Hongguang Li, Kai Teng, Shaolong Wu, Yongbin Liu, Fahui Yu, Zhihong He, Lijuan Li, Liangzhi Li, Delong Meng, Huaqun Yin, and Yujie Wang
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soil microbial community ,bacterial wilt ,metagenomics ,interactions ,HGT ,Plant culture ,SB1-1110 - Abstract
Understanding the response of soil microbial communities to pathogenic Ralstonia solanacearum is crucial for preventing bacterial wilt outbreaks. In this study, we investigated the soil physicochemical and microbial community to assess their impact on the pathogenic R.solanacearum through metagenomics. Our results revealed that certain archaeal taxa were the main contributors influencing the health of plants. Additionally, the presence of the pathogen showed a strong negative correlation with soil phosphorus levels, while soil phosphorus was significantly correlated with bacterial and archaeal communities. We found that the network of microbial interactions in healthy plant rhizosphere soils was more complex compared to diseased soils. The diseased soil network had more linkages, particularly related to the pathogen occurrence. Within the network, the family Comamonadaceae, specifically Ramlibacter_tataouinensis, was enriched in healthy samples and showed a significantly negative correlation with the pathogen. In terms of archaea, Halorubrum, Halorussus_halophilus (family: Halobacteriaceae), and Natronomonas_pharaonis (family: Haloarculaceae) were enriched in healthy plant rhizosphere soils and showed negative correlations with R.solanacearum. These findings suggested that the presence of these archaea may potentially reduce the occurrence of bacterial wilt disease. On the other hand, Halostagnicola_larseniia and Haloterrigena_sp._BND6 (family: Natrialbaceae) had higher relative abundance in diseased plants and exhibited significantly positive correlations with R.solanacearum, indicating their potential contribution to the pathogen’s occurrence. Moreover, we explored the possibility of functional gene sharing among the correlating bacterial pairs within the Molecular Ecological Network. Our analysis revealed 468 entries of horizontal gene transfer (HGT) events, emphasizing the significance of HGT in shaping the adaptive traits of plant-associated bacteria, particularly in relation to host colonization and pathogenicity. Overall, this work revealed key factors, patterns and response mechanisms underlying the rhizosphere soil microbial populations. The findings offer valuable guidance for effectively controlling soil-borne bacterial diseases and developing sustainable agriculture practices.
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- 2024
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5. Efficacy and safety of Lianhua Qingwen granule in the treatment of non-influenza viral pneumonia: a randomized, double-blind, placebo-controlled, multicenter clinical study
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Chengjie Ma, Bojun Chen, Yanming Li, Li Gu, Jianping Dong, Zhenyang Xu, Lijuan Wei, Zhihong He, Xiuhong Nie, Shuwen Feng, Bin Cao, Lei Sun, Limin Yang, Xingwang Li, and Rongmeng Jiang
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non-influenza virus pneumonia ,Lianhua clear blast particles ,Chinese medicine treatment ,clinical trials ,RCT – randomized controlled trial ,Medicine (General) ,R5-920 - Abstract
ObjectiveTo observe the effectiveness and safety of Lianhua Qingwen granule in the treatment of non-influenza viral pneumonia.MethodsThis study was a multicenter, randomized, double-blind, placebo-controlled trial. Subjects who met the inclusion and exclusion criteria and were clinically diagnosed with viral pneumonia (negative for influenza virus) were randomly divided into the Lianhua Qingwen granule trial group and placebo control group. Patients in the trial group was given Lianhua Qingwen granule, 2 bags at a time, 3 times a day, and the controls were given placebo, with a treatment course of 7 days. Patients’ clinical symptoms and signs, and treatment-associated adverse events were observed. Subjects should be included in the full analysis set (FAS) as long as they were all given the medication and had an effectiveness test performed after randomization. Subjects should be included in the Per Protocol Set (PPS),a subset of the total analysis set, which should contain those with strong compliance, no protocol violations, and complete baseline values for the primary indicators.ResultsA total of 169 subjects were enrolled in 12 subcenters, including 151 (76 in the trial group and 75 in the control group) in the FAS and 140 (68 in the trial group and 72 in the control group) in the PPS. After 7 days of treatment, the clinical symptom relief rates were 82.98% (FAS) and 87.12% (PPS) in the trial group, and 75.11% (FAS) and 76.02% (PPS) in the control group, respectively. The clinical symptom relief rates in the trial group were significantly higher than those in the control group (p 0.05).SafetyThere were no significant differences in body weight, vital signs, blood routine, urine routine, stool routine, and blood biochemical indicators (CK, AST, ALT, Cr, and Bun) between the two groups before and after treatment (p > 0.05). During treatment, there were no significant differences in the incidence of adverse events and serious adverse events between the two groups (p > 0.05).ConclusionLianhua Qingwen granules improved the clinical symptoms of patients with non-influenza virus pneumonia, especially ameliorating cough and expectoration. Lianhua Qingwen granules were associated with good safety.
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- 2024
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6. KLF4 transcription factor in tumorigenesis
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Zhihong He, Jie He, and Keping Xie
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Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 ,Cytology ,QH573-671 - Abstract
Abstract Krüppel-like transcriptional factor is important in maintaining cellular functions. Deletion of Krüppel-like transcriptional factor usually causes abnormal embryonic development and even embryonic death. KLF4 is a prominent member of this family, and embryonic deletion of KLF4 leads to alterations in skin permeability and postnatal death. In addition to its important role in embryo development, it also plays a critical role in inflammation and malignancy. It has been investigated that KLF4 has a regulatory role in a variety of cancers, including lung, breast, prostate, colorectal, pancreatic, hepatocellular, ovarian, esophageal, bladder and brain cancer. However, the role of KLF4 in tumorigenesis is complex, which may link to its unique structure with both transcriptional activation and transcriptional repression domains, and to the regulation of its upstream and downstream signaling molecules. In this review, we will summarize the structural and functional aspects of KLF4, with a focus on KLF4 as a clinical biomarker and therapeutic target in different types of tumors.
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- 2023
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7. Theoretical exploration of heat transport in a stagnant power-law fluid flow over a stretching spinning porous disk filled with homogeneous-heterogeneous chemical reactions
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Zhihong He, Muhammad Bilal Arain, Usman, W.A. Khan, Ali Rashash R Alzahrani, Taseer Muhammad, A.S. Hendy, and Mohamed R. Ali
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Homogeneous-heterogeneous reactions ,Power-law fluids ,Porous disk ,Stagnant flow ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
The distinction between homogeneous and heterogeneous chemical reactions is crucial because many chemically reactive systems, such as hydrometallurgical processes, cooling towers, biological systems, fog dispersion, catalysis, etc., involve both types of reactions. Thus, this study analyzes the heat transmission (HT) characteristics in an MHD stagnant flow of power-law fluid caused by a spinning disk that is stretched and saturated in a porous medium. The study considers homogeneous-heterogeneous (HH) reactions and nonlinear thermal radiation subject to no-slip and convection boundary conditions. The leading equations are switched into ordinary differential equations (ODEs) employing similarity variables. The study focuses on the dimensionless concentration, velocity, temperature, Nusselt number, and skin friction coefficient, which are discussed in detail in the results and discussion section. The study observes that for power-law fluids with an index value less than 1, the skin friction coefficient decays as the power-law index grows. It also notes that the dimensionless skin friction of power-law fluids decreases as the velocity ratio increases. The dimensionless concentration increases with Schmidt and modified Prandtl numbers for both power-law fluids over a stretching spinning porous disk. The HH reaction parameters decline the concentration of power-law fluids.
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- 2023
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8. Data-driven methods for situation awareness and operational adjustment of sustainable energy integration into power systems
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Shi Jin, Qian Liu, Wenlu Zhang, Zhihong He, Yuxiong He, Lihong Zhang, Yuan Liu, Peidong Xu, Xiao Zhang, and Yuhong He
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power system ,situation awareness ,operational adjustment ,forecasting ,reinforcement learning ,General Works - Abstract
In the context of increasing complexity in power system operations due to the integration of renewable energy sources, two main challenges arise: accurate short-term wind power forecasting and power flow convergence control. Accurate wind power forecasting plays a crucial role in power system scheduling, while controlling power flow convergence is essential for system stability. This study proposes a concise short-term wind power generation prediction model that combines a feature selection-based convolutional neural network-bidirectional long short-term memory network (CNN-BiLSTM) model. By effectively screening multidimensional feature datasets, the model optimizes the selection of highly correlated feature parameters and assigns weights to input data based on feature correlation. The CNN-BiLSTM combination model is then employed to establish a predictive model for wind power generation based on multiple features. Additionally, this study introduces an automatic adjustment model for power flow convergence using the D3QN (Double Dueling Q Network) reinforcement learning algorithm. This addresses the challenge of power imbalance leading to flow non-convergence, enabling effective control of power flow convergence and adaptive adjustment of operating modes. Experiments conducted using the KDD Cup 2022 wind power prediction dataset validate the wind power prediction method. The results demonstrate that the CNN-BiLSTM model effectively utilizes time-series data, surpassing other neural networks in prediction accuracy. Simulation results based on the PYPOWER case39 standard case reveal that the reinforcement learning model’s reward value increases with training rounds and stabilizes at 40. Remarkably, more than 72% of abnormal flow samples achieve rapid convergence within 10 steps, affirming the proposed method's efficacy and computational efficiency. The findings of this study contribute to enhancing the accurate awareness of new energy integration into power systems and provide a novel adaptive control method for power flow.
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- 2023
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9. Aberrant HPO Axis Alterations and Autoimmune Abnormalities in PCOS Patients with DOR: A Retrospective Analysis
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Xueying Geng, Zhihong He, Zhouzhou Bao, Wen Di, and Zhuowei Gu
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PCOS ,DOR ,autoimmune antibodies ,HPO axis ,glucolipid metabolism ,Medicine - Abstract
Background: There is a group of polycystic ovary syndrome (PCOS) patients in clinic who have diminished ovarian reserve (DOR) in combination. This study was designed to evaluate the differences in glucolipid metabolism, hypothalamic–pituitary–ovarian (HPO) axis-related parameters, and autoimmune antibodies in PCOS patients with and without DOR. Methods: A total of 2307 PCOS patients, including 1757 patients with PCOS alone and 550 patients who have both PCOS and DOR, were enrolled in this retrospective study. Parameters of glucolipid metabolism, HPO axis-related parameters, and autoimmune antibodies were measured and analyzed. Results: The prevalence of DOR among all patients with PCOS was 23.84%. Many HPO axis-related parameters, such as follicle-stimulating hormone (FSH), luteinizing hormone (LH), estradiol (E2), and prolactin (PRL) were significantly different in PCOS with DOR compared with PCOS without DOR. The FSH levels were positively correlated with LH, testosterone (T), and androstenedione (AD) levels, but had no association with glucolipid metabolism after adjusting for body mass index (BMI). Moreover, anti-ovarian antibody (AOAb) and anti-21-OH antibody (21-OHAb) levels were significantly elevated in PCOS patients with DOR. Conclusions: PCOS patients with DOR showed more chaotic HPO axis hormone levels and elevated autoimmune antibodies, suggesting that autoimmune factors may be the cause of DOR in women with PCOS.
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- 2023
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10. Geometry and Kinematics of a Dancing Milky Way: Unveiling the Precession and Inclination Variation across the Galactic Plane via Open Clusters
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Zhihong He
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Milky Way Galaxy ,Open star clusters ,Galaxies ,Galaxy disks ,Galaxy structure ,Astrophysics ,QB460-466 - Abstract
This Letter presents a study of the geometry and motion of the Galactic disk using open clusters in the Gaia era. The findings suggest that the inclination θ _i of the Galactic disk increases gradually from the inner to the outer disk, with a shift in orientation at the Galactocentric radius of approximately 6 ± 1 kpc. Furthermore, this study brings forth the revelation that the mid-plane of the Milky Way may not possess a stationary or fixed position. A plausible explanation is that the inclined orbits of celestial bodies within our Galaxy exhibit a consistent pattern of elliptical shapes, deviating from perfect circularity; however, more observations are needed to confirm this. An analysis of the vertical motion along the Galactocentric radius reveals that the disk has warped with precession and that the line of node shifts at different radii, aligning with the results from the classical Cepheids. Although there is uncertainty for precession/peculiar motion in solar orbit, after considering the uncertainty, the study derives a median value of ${\dot{\phi }}_{\mathrm{LON}}$ = 6.8 km s ^−1 kpc ^−1 in the Galaxy. This value for the derived precession in the outer disk is lower than those in the literature due to the systematic motion in solar orbit ( θ _i = 0.°6). The study also finds that the inclinational variation of the disk is significant and can cause systematic motion, with the variation rate ${\dot{\theta }}_{i}$ decreasing along the Galactic radius with a slope of −8.9 μ as yr ^−1 kpc ^−1 . Moreover, the derived ${\dot{\theta }}_{i}$ in solar orbit is 59.1 ± 11.2 _sample ± 7.7 ${}_{{V}_{Z\odot }}$ μ as yr ^−1 , which makes it observable for high-precision astrometry.
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- 2023
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11. Comparative study on electrocardiograms and serological examinations of acute pulmonary embolism and acute non‐ST elevation myocardial infarction
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Zhihong He, Wenmiao Bi, Zhe Lang, Yanjie Zhen, Ying Jin, Hongjuan Liu, Dongfu Li, Xiaoning Hu, and Huanling Li
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acute non‐ST elevation myocardial infarction ,acute pulmonary embolism ,D‐dimer ,electrocardiogram ,myocardial zymogram ,troponin ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Abstract Background The aim of this study was to investigate the value of electrocardiograms (ECGs) and serological examinations in the differential diagnosis of acute pulmonary embolism (APE) and acute non‐ST elevation myocardial infarction (NSTEMI) in order to reduce the rate of clinical misdiagnosis. Methods The clinical data of 37 patients with APE and 103 patients with NSTEMI admitted to our hospital were retrospectively analyzed. The differences in the clinical manifestations, ECGs, myocardial zymograms, D‐dimers, and troponin (cTn) of the two groups were compared. Results In the patients with APE, the main symptom—found in 25 cases (67.56%)—was dyspnea, while in the patients with NSTEMI, the main symptom—found in 52 cases (50.49%)—was chest tightness. The incidences of sinus tachycardia and SIQIIITIII in the group of patients with APE were higher than in the group of patients with NSTEMI, and the difference was statistically significant (p .05), although there was a statistically significant difference of creatine kinase (CK) and the creatine kinase isoenzyme‐MB (CK‐MB) in the two groups (p
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- 2022
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12. Metformin inhibits cervical cancer cell proliferation by modulating PI3K/Akt-induced major histocompatibility complex class I-related chain A gene expression
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Chenglai Xia, Chang Liu, Zhihong He, Yantao Cai, and Jinman Chen
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Metformin ,Histocompatibility complex class I-related chain a ,Cervical cancer ,PI3K ,Cell proliferation ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Abstract Background Recent studies have shown that the classic hypoglycemic drug metformin inhibits tumor growth; however, the underlying mechanism remains unclear. We previously showed that metformin disrupts the sponge effect of long non-coding RNA MALAT1/miR-142-3p to inhibit cervical cancer cell proliferation. In this study, we interrogated the ability of metformin to modulate the anti-tumor immune response in cervical cancer. Methods The cell counting kit-8 assay was used to detect the viability of cervical cancer cells. Flow cytometry assays were performed to measure cell apoptosis and cell cycle. Lactate dehydrogenase (LDH) cytotoxicity assay was used to detect NK Cell Cytotoxicity. Relative protein levels were determined by immunoblotting and relative gene levels were determined by quantitative real-time PCR. Tumor Xenograft Modeling was used to evaluate the effect of metformin in vivo. Results Metformin inhibited cervical cancer cell proliferation, cervical cancer xenograft growth, expression of PCNA, p-PI3K and p-Akt. Moreover metformin induced cervical cancer cell apoptosis and caused cancer cell cycle arrest. In addition, metformin upregulated the expression of DDR-1 and p53 in human cervical cancer cells. Furthermore, metformin also regulated the mRNA and protein expression of MICA and HSP70 on the surface of human cervical cancer cells via the PI3K/Akt pathway, enhancing NK cell cytotoxicity. Conclusions In conclusion, our results suggest that metformin may be used as immunopotentiator to inhibit cervical cancer progression and may be considered a viable candidate for combination therapy with immunotherapy.
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- 2020
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13. Quantitative proteomics analysis of differentially expressed proteins induced by astragaloside IV in cervical cancer cell invasion
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Chenglai Xia, Zhihong He, and Yantao Cai
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Astragaloside IV ,Quantitative proteomics ,iTRAQ ,Parallel reaction monitoring ,Cervical cancer ,Cytology ,QH573-671 - Abstract
Abstract Background Cervical cancer remains the second leading cause of mortality in women in developing countries. While surgery, chemotherapy, radiotherapy, and vaccine therapy are being applied for its treatment, individually or in combination, the survival rate in advanced cervical cancer patients is still very low. Traditional Chinese medicine has been found to be effective in the treatment of cervical cancer. Astragaloside IV (AS-IV), a compound belonging to Astragalus polysaccharides, shows anticancer activity through several cell signaling pathways. However, the detailed molecular mechanism governing the anticancer activity of AS-IV remains unknown. Material and methods In our study, we performed tumor xenograft analysis, transwell cell migration and invasion assay, Western blot analysis, and iTRAQ combination by parallel reaction monitoring (PRM) analysis to study the molecular mechanism of AS-IV in the suppression of cervical cancer cell invasion. Results Our results showed that AS-IV suppressed cervical cancer cell invasion and induced autophagy in them, with the tumor growth curve increasing slowly. We also identified 32 proteins that were differentially expressed in the SiHa cells when treated with AS-IV, with 16 of them involved in the upregulation and 16 in the downregulation of these cells. These differentially expressed proteins, which were predominantly actin–myosin complexes, controlled cell proliferation and cell development by steroid binding and altering the composition of the cell cytoskeleton. DCP1A and TMSB4X, the two proteins regulating autophagy, increased in cervical cancer cells when treated with AS-IV. Conclusions We conclude that AS-IV could inhibit cervical cancer invasion by inducing autophagy in cervical cancer cells. Since iTRAQ combination by PRM has been observed to be useful in identifying macromolecular target compounds, it may be considered as a novel strategy in the screening of anticancer compounds used in the treatment of cervical cancer.
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- 2020
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14. Survey for Distant Stellar Aggregates in the Galactic Disk: Detecting 2000 Star Clusters and Candidates, along with the Dwarf Galaxy IC 10
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Zhihong He, Yangping Luo, Kun Wang, Anbing Ren, Liming Peng, Qian Cui, Xiaochen Liu, and Qingquan Jiang
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Open star clusters ,Globular star clusters ,Dwarf galaxies ,Milky Way Galaxy ,Gaia ,Astrophysics ,QB460-466 - Abstract
Despite having data for over 10 ^9 stars from Gaia, less than 10 ^4 star clusters and candidates have been discovered. In particular, distant star clusters are rarely identified, due to the challenges posed by heavy extinction and great distance. However, Gaia data has continued to improve, enabling even fainter cluster members to be distinguished from field stars. In this work, we introduce a star-cluster search method based on the DBSCAN algorithm; we have made improvements to make it better suited for identifying clusters on dimmer and more distant stars. After having removed member stars of known Gaia-based clusters, we identified 2086 objects with ∣ b ∣ < 10°, of which 1488 are highly reliable open star clusters, along with 569 candidates, 28 globular cluster candidates, and one irregular galaxy (IC 10) at low Galactic latitudes. We found that the proper motion of IC 10 is similar to, yet slightly different from, the water maser observations, which is an important result for the comparison with Gaia and the Very Long Baseline Array. When compared with the star clusters appearing in Gaia Data Release (DR) 2/EDR3, we found nearly 3 times as many new objects above a distance of 5 kpc, including hundreds of them above A _v > 5 mag. This has enabled us to detect a higher number of old clusters, over a billion years old, that are difficult to detect due to observational limitations. Our findings significantly expand the remote cluster sample and enhance our understanding of the limits of Gaia DR3 data in stellar aggregates research.
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- 2023
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15. WiRIM: Resolution Improving Mechanism for Human Sensing With Commodity Wi-Fi
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Xinbin Shen, Lingchao Guo, Zhaoming Lu, Xiangming Wen, and Zhihong He
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Human sensing ,resolution improvement ,Wi-Fi ,CSI ,cross-location human activity recognition ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
The growing physical (PHY) layer capabilities of Wi-Fi have made it possible to use Wi-Fi signals for both communication and human sensing. Wi-Fi channel state information (CSI) in PHY layer can be obtained from commodity Wi-Fi devices. As CSI can detect the minute environment changes that alter signal propagation, it is thus capable of capturing the subtle human activities to provide cost-effective and easy-to-use human sensing. However, the limited bandwidth of each individual Wi-Fi channel fundamentally constrains the resolution of signals, resulting in poor performance of human sensing. In this paper, we present WiRIM, a resolution improving mechanism for Wi-Fi based human sensing. We design a channel switching and aggregation algorithm to extend the effective bandwidth of commodity Wi-Fi signals and improve the performance and efficiency of human sensing applications. With aggregated CSI, WiRIM constructs feature images which contain rich frequency, temporal and spatial characteristics, and then uses a deep learning method to process the extracted features. We propose a cross-location human activity recognition (CLHAR) scenario as a case study. The CLHAR scenario requires a high enough resolution of the Wi-Fi signals to accurately recognize different activities under the interference of tiny changes in human location. The experiments demonstrate the generality and effectiveness of the proposed mechanism.
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- 2019
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16. iTRAQ-based quantitative proteomic analysis of the inhibition of cervical cancer cell invasion and migration by metformin
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Chenglai Xia, Fang Yang, Zhihong He, and Yantao Cai
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Quantitative proteomics ,Metformin ,Cervical cancer ,Tumor invasion ,Tumor metastasis ,Therapeutics. Pharmacology ,RM1-950 - Abstract
In recent years the anti-diabetic drug metformin has been shown to inhibit tumor growth, but the underlying mechanism is unclear. Our previous results showed that metformin can destroy the sponge effect of long-chain non-coding RNA MALAT1/miR-142-3p and inhibit the proliferation of cervical cancer cells. Metformin can inhibit the PI3K/Akt signaling pathway and synergizes with Nelfinavir to inhibit the proliferation and invasion of cervical cancer cells. In this study, we used iTRAQ-based proteomics, mass spectrometry-based targeted proteomics, immunoblotting, and bioinformatics to analyze the molecular mechanism by which metformin inhibits the proliferation and invasion of cervical cancer cells. We found that 53 proteins were differentially expressed in cervical cancer cells after metformin treatment, of which 20 were up-regulated and 33 were down-regulated. Bioinformatics analysis showed that the 53 differentially expressed proteins are negative regulators of receptor signaling that inhibit cell growth and are mainly enriched in cell growth and apoptosis signaling pathways. We performed PRM verification on 11 of the differentially expressed proteins and found that they were all associated with apoptosis. We also found that metformin up-regulated the expression of the tumor suppressor IGFBP7 to inhibit the proliferation and invasion of cervical cancer cells. Our results indicate that metformin mainly regulates the insulin signaling pathway and interferes with cell proliferation and apoptosis to inhibit proliferation and invasion of cervical cancer cells. These differentially expressed proteins may become new targets for the treatment of cervical cancer.
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- 2020
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17. Unveiling Hidden Stellar Aggregates in the Milky Way: 1656 New Star Clusters Found in Gaia EDR3
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Zhihong He, Xiaochen Liu, Yangping Luo, Kun Wang, and Qingquan Jiang
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Open star clusters ,Star clusters ,Astrophysics ,QB460-466 - Abstract
We report 1656 new star clusters found in the Galactic disk (∣ b ∣ < 20°) beyond 1.2 kpc, using Gaia EDR3 data. Based on an unsupervised machine-learning algorithm, DBSCAN, and following our previous studies, we utilized a unique method to do the data preparation and obtain the clustering coefficients, which proved to be an effective way to search blindly for star clusters. We tabulate the physical parameters and member stars of the new clusters, and present some interesting examples, including a globular cluster candidate. The cluster parameters and member stars are available in machine-readable format in the online journal. We examine the new discoveries and discuss their statistical properties. The proper-motion dispersions and radii of the star clusters are the same as those previously reported. The new clusters beyond 1.2 kpc are older than those in the solar neighborhood, and the new objects found in the third Galactic quadrant present the lowest line-of-sight extinctions. Combined with our previous results, the total population of new clusters and candidates detected through our method is 2541, corresponding to 55% of all newly published clusters in the Gaia era. The number of cataloged Gaia star clusters was also increased to nearly 6000. In the near future, it will be necessary to make a unified confirmation and member star determination for all reported clusters.
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- 2022
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18. Wide-Angle Polarization-Controllable Structure Color Based on Metamaterial Resonators With Polarized Multiband Absorption Peaks
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Lei Zhao, Han Liu, Zhihong He, and Shikui Dong
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Subwavelength structure ,plasmonics ,metamaterial ,nanostructures ,Applied optics. Photonics ,TA1501-1820 ,Optics. Light ,QC350-467 - Abstract
The polarization-controllable structure color has been theoretically designed by utilizing metamaterial resonators with polarization-dependent multiband absorption peaks. Our designed nanostructure, consisting of the periodic circle and ellipse resonators, shows above 80% reflectivity from 502 to 553 nm (the green structure color) for TE-polarized incident white light, but above 80% reflectivity from 610 to 750 nm (the red structure color) for TM-polarized incident white light. Therefore, the structure colors gradually change from green to red when the polarization angles increasing from 0° (TE) to 90° (TM). The polarization-controllable structure colors come from the polarization-dependent multiband absorption peaks. When the polarization changes from TE to TM, the absorption peaks shift from 454, 624, and 714 nm to 454, 498, and 550 nm. The physical mechanism is explained by the electromagnetic fields distribution and the equivalent LC circuit model. It can keep the structure color for a wide incident angle.
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- 2018
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19. Infrared Optical Observability of an Earth Entry Orbital Test Vehicle Using Ground-Based Remote Sensors
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Qinglin Niu, Xiaying Meng, Zhihong He, and Shikui Dong
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ground-based detection ,infrared imaging ,observability ,detecting distance ,earth entry vehicle ,Science - Abstract
Optical design parameters for a ground-based infrared sensor rely strongly on the target’s optical radiation properties. Infrared (IR) optical observability and imaging simulations of an Earth entry vehicle were evaluated using a comprehensive numerical model. Based on a ground-based IR detection system, this model considered many physical mechanisms including thermochemical nonequilibrium reacting flow, radiative properties, optical propagation, detection range, atmospheric transmittance, and imaging processes. An orbital test vehicle (OTV) was selected as the research object for analysis of its observability using a ground-based infrared system. IR radiance contours, maximum detecting range (MDR), and thermal infrared (TIR) pixel arrangement were modeled. The results show that the distribution of IR radiance is strongly dependent on the angle of observation and the spectral band. Several special phenomena, including a strong receiving region (SRR), a characteristic attitude, a blind zone, and an equivalent zone, are all found in the varying altitude MDR distributions of mid-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) irradiances. In addition, the possible increase in detectivity can greatly improve the MDR at high altitudes, especially for the backward and forward views. The difference in the peak radiance of the LWIR images is within one order of magnitude, but the difference in that of the MWIR images varies greatly. Analyses and results indicate that this model can provide guidance in the design of remote ground-based detection systems.
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- 2019
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20. Effect of Channel Diameter on the Combustion and Thermal Behavior of a Hydrogen/Air Premixed Flame in a Swirl Micro-Combustor
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Xiao Yang, Zhihong He, Lei Zhao, Shikui Dong, and Heping Tan
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micro combustion ,hydrogen ,swirl micro-combustor ,channel diameter ,flame anchoring ,Technology - Abstract
Improving the flame stability and thermal behavior of the micro-combustor (MC) are major challenges in microscale combustion. In this paper, the micro combustions of an H2/air premixed flame in a swirl MC with various channel diameters (Din = 2, 3, 4 mm) were analyzed based on an established three-dimensional numerical model. The effects of hydrogen mass flow rate, thermal conductivity of walls, and the preferential transport of species were investigated. The results indicated that the flame type was characterized by the presence of two recirculation zones. The flame was anchored by the recirculation zones, and the anchoring location of the flame root was the starting position of the recirculation zones. The recirculation zones had a larger distribution of local equivalence ratio, especially in the proximity of the flame root, indicating the formation of a radical pool. The combustion efficiency increased with an increasing Din due to the longer residence time of the reactants. Furthermore, the MC with Din = 2 mm obtained the highest outer wall temperature distribution. However, the MC with Din = 4 mm had a better uniformity of outer wall temperature and large emitter efficiency due to the larger radiation surface. An increase in thermal conductivity boosts the thermal performance of combustion efficiency, emitter efficiency, and wall temperature uniformity. But there is a critical point of thermal conductivity that can increase the thermal performance. The above results can offer us significant guidance for designing MC with high thermal performance.
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- 2019
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- View/download PDF
21. ST-Segment Alterations in the Electrocardiogram of Acute Pulmonary Thromboembolism: A Rabbit Model.
- Author
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Dongchao LIU, Bing DUAN, Meina Zhao, Lin Wu, Yazhen Cao, Ningbo Liu, Zheng Xue, ZhiHong He, and Jie Mi
- Subjects
ELECTROCARDIOGRAPHY ,PULMONARY embolism ,POLYMERASE chain reaction ,BRAIN natriuretic factor ,MESSENGER RNA - Abstract
In this study, we investigated the mechanism underlying electrocardiogram (ECG) alterations in a rabbit model of acute pulmonary thromboembolism (PTE). Twelve healthy adult New Zealand white rabbits were used, with eight in the experimental group (PTE group) and four in the control group. After developing the rabbit model of acute PTE, ECG and coronary angiography were performed. HE staining was conducted on the right and left ventricular tissues, and polymerase chain reaction (PCR) was used to determine brain natriuretic peptide (BNP), tumor necrosis factor-alpha (TNF-α), and Troponin I (TNI) mRNA expression in the myocardium. There were considerable changes in the ST segment of the ECG in the PTE group. Coronary angiography revealed the absence of spasm, stenosis, and occlusion. In the plasma of the PTE group, the levels of D-dimer, BNP, TNF-α, and TNI were significantly elevated, and these changes were statistically significant (P<0.05). PCR analysis of ventricular myocardial tissue indicated significantly higher levels of BNP, TNF-α, and TNI mRNA in the PTE group than in the control group. These differences were statistically significant (P<0.05). The ST-T variations on the ECG of rabbits with acute PTE correlate strongly with the temporary changes in right heart volume caused by acute PTE. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
22. Emergency Semantic Feature Vector Extraction From WiFi Signals for In-Home Monitoring of Elderly.
- Author
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Lingchao Guo, Zhaoming Lu, Shuang Zhou 0003, Xiangming Wen, and Zhihong He
- Published
- 2021
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23. Contact-Free In-Home Health Monitoring System with Commodity Wi-Fi.
- Author
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Zhihong He, Lingchao Guo, Zhaoming Lu, Xiangming Wen, Wei Zheng 0001, and Shuang Zhou 0003
- Published
- 2019
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24. Super edge-connectivity and zeroth-order Randiæ index.
- Author
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Zhihong He and Mei Lu
- Published
- 2020
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- View/download PDF
25. Boundary layer effect of light transmission through ionic liquid under electric field
- Author
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Ji Zhou, Yi Zheng, Shikui Dong, Zhihong He, Bao Liu, and Yanhu Zhang
- Subjects
General Physics and Astronomy ,General Materials Science - Published
- 2023
26. When Healthcare Meets Off-the-Shelf WiFi: A Non-Wearable and Low-Costs Approach for In-Home Monitoring.
- Author
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Lingchao Guo, Zhaoming Lu, Shuang Zhou 0003, Xiangming Wen, and Zhihong He
- Published
- 2020
27. Disjoint Cycles of Different Lengths in 3-Regular Digraphs.
- Author
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Zhihong He, Panpan Cheng, and Yunshu Gao
- Published
- 2022
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- View/download PDF
28. Reversible data hiding in encrypted image with separable capability and high embedding capacity.
- Author
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Chuan Qin 0001, Zhihong He, Xiangyang Luo, and Jing Dong 0003
- Published
- 2018
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29. Visible watermark removal scheme based on reversible data hiding and image inpainting.
- Author
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Chuan Qin 0001, Zhihong He, Heng Yao, Fang Cao, and Liping Gao
- Published
- 2018
- Full Text
- View/download PDF
30. 3D Video Image Processing Effect Optimization Method Based on Virtual Reality Technology
- Author
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Zhihong He, Wenjie Jia, Erhua Sun, and Huilong Sun
- Subjects
Signal Processing ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Electrical and Electronic Engineering - Abstract
The existing optimization methods have the problem of image edge blur, which leads to a high degree of shadow residue. In order to address this problem, reduce the shadow residual degree, this paper designs a 3D video image processing effect optimization method supported by virtual reality technology. Coding was used to eliminate redundant data in video and eliminate image noise using median filtering. The virtual reality technology detects the image edge and determines the motion offset between the image frames. According to the motion parameters of the camera carrier obtained from the motion estimation, the feature point matching algorithm constructs the video image motion model, and uses the camera calibration technology to set the processing effect optimization mode. It is optimized by perspective projection transformation. Experimental results: the average shadow residual degree of the optimization method and the two existing optimization methods are 3.108%, 6.167% and 6.396% respectively, which proves that the optimization method combined with virtual reality technology has higher practical application value.
- Published
- 2022
31. Evolution trend of soil fertility in tobacco-planting area of Chenzhou, Hunan Province, China
- Author
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Yansong, Xiao, Yahua, Liao, Jianlin, Hou, Lijuan, Li, Taosha, Xu, Fengying, Ma, Fahui, Yu, Zhipeng, Tan, Zhihong, He, Hong, Jian, Hongguang, Li, and Bin, He
- Subjects
General Immunology and Microbiology ,General Neuroscience ,General Agricultural and Biological Sciences ,General Biochemistry, Genetics and Molecular Biology - Abstract
In this study, the data of fertility indicators of soil samples (0–20 cm) in 1980s, 2000 and 2015 in Chenzhou city were used, and the soil integrated fertility index (IFI) was calculated. The results showed that the soil pH was decreased, total nitrogen (TN), organic matter (OM), available phosphorus (AP) and potassium (AK), exchangeable calcium (Ca2+), magnesium (Mg2+) and available copper (Cu) contents were increased, total phosphorus (TP), available sulfur (S) and water-soluble chlorine (Cl−) contents were decreased, total potassium (TK), available boron (B), iron (Fe), manganese (Mn) and zinc (Zn) were decreased first and then increased. In 2015, most of the fields were higher in pH, OM, TN, AN, AK, Ca2+, Mg2+, S, Fe, Mn, Cu and Zn, suitable in B, but lower in TP, AP, TK, available molybdenum (Mo) and Cl−. Most of the fields were in the middle grade of IFI in 2000 and 2015, and the mean IFI increased from 0.492 to 0.556 from 2000 to 2015. Thus, for soil improvement, more attention should be paid to adjust soil pH, reduce the application of organic, nitrogen and calcium fertilizers, while increase the fertilizer application of other nutrients.
- Published
- 2022
32. Componentwise Complementary Cycles in Almost Regular 3-Partite Tournaments.
- Author
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Zhihong He, Guojun Li, Dawei Ding, and Quanhui Liu
- Published
- 2007
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33. New Open Cluster candidates Found in Galactic Disk Using Gaia DR2/EDR3 Data
- Author
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Zhihong He, Chunyan Li, Jing Zhong, Guimei Liu, Leya Bai, Songmei Qin, Yueyue Jiang, Xi Zhang, and Li Chen
- Subjects
Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics - Astrophysics of Galaxies - Abstract
We report 541 new open cluster candidates in Gaia EDR3 through revisiting the cluster results from an earlier analysis of the Gaia DR2, which revealed nearly a thousand open cluster candidates in the solar neighborhood (mostly d < 3 kpc) resideing at Galactic latitudes |b| < 20 degrees. A subsequent comparison with lists of known clusters shows a large increases of the cluster samples within 2 kpc from the Sun. We assign membership probabilities to the stars through the open source pyUPMASK algorithm, and also estimate the physical parameters through isochrone fitting for each candidate. Most of the new candidates show small total proper motion dispersions and clear features in the color-magnitude diagrams. Besides, the metallicity gradient of the new candidates is consistent with those found in the literature. The cluster parameters and member stars are available at CDS via anonymous ftp to cdsarc.u-strasbg.fr(130.79.128.5) or via https://cdsarc.unistra.fr/viz-bin/cat/J/ApJS. The discovery of these new objects shows that the open cluster samples in Gaia data is still not complete, and more discoveries are expected in the future researches., 13 pages, 8 figures, 3 tables, accepted for publication in ApJS; online data submitted to CDS (see link int the paper)
- Published
- 2022
34. Weakly Cycle Complementary 3-Partite Tournaments.
- Author
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Zhihong He and Yan Wang
- Published
- 2011
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35. Protein folding simulations of 2D HP model by the genetic algorithm based on optimal secondary structures.
- Author
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Chenhua Huang, Xiangbo Yang, and Zhihong He
- Published
- 2010
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36. Complementary cycles in regular multipartite tournaments, where one cycle has length five.
- Author
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Zhihong He, Torsten Korneffel, Dirk Meierling, Lutz Volkmann, and Stefan Winzen
- Published
- 2009
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37. A Blind All-sky Search for Star Clusters in Gaia EDR3: 886 Clusters within 1.2 kpc of the Sun
- Author
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Zhihong He, Kun Wang, Yangping Luo, Jing Li, Xiaochen Liu, and Qingquan Jiang
- Subjects
Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics - Astrophysics of Galaxies - Abstract
Although previous searches for star clusters have been very successful, many clusters are likely still omitted, especially at high Galactic latitude regions. In this work, based on the astrometry of Gaia EDR3, we searched nearby (parallax > 0.8 mas) all-sky regions, obtaining 886 star clusters, of which 270 candidates have not been cataloged before. At the same time, we have presented the physical parameters of the clusters by fitting theoretical isochrones to their optical magnitudes. More halo members and expanding structures in many star clusters were also found. Most of the new objects are young clusters that are less than 100 million years old. Our work greatly increased the sample size and physical parameters of star clusters in the solar neighborhood, in particular, 46 clusters are newly found with |b| > 20 deg, which represents an increase of nearly three fold of cluster numbers at high Galactic latitude regions. The cluster parameters and member stars are available at CDS via https://cdsarc.u-strasbg.fr/ftp/vizier.submit//hezh22b/, and the cluster figure sets are available via https://doi.org/10.12149/101133., 16 figures, 2 tables (full version available at CDS), 886 figures in figure set, accepted for publication on ApJs
- Published
- 2022
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- View/download PDF
38. Improved Algorithms for Single Machine Serial-Batch Scheduling to Minimize Makespan and Maximum Cost
- Author
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Zhihong He and Shuguang Li
- Subjects
History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2022
39. Comparison of Precipitation from Different Meteorological Stations: A Case Study
- Author
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Yansong Xiao, Yahua Liao, Lijuan Li, Jianlin Hou, Sijun Li, Zhipeng Tan, Rujing Deng, Zhihong He, Hongguang Li, and Bin He
- Published
- 2022
40. Comparative study on electrocardiograms and serological examinations of acute pulmonary embolism and acute non‐ST elevation myocardial infarction
- Author
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Zhihong He, Wenmiao Bi, Zhe Lang, Yanjie Zhen, Ying Jin, Hongjuan Liu, Dongfu Li, Xiaoning Hu, and Huanling Li
- Subjects
Arrhythmias, Cardiac ,General Medicine ,Electrocardiography ,Dyspnea ,Physiology (medical) ,Acute Disease ,Creatine Kinase, MB Form ,Humans ,ST Elevation Myocardial Infarction ,Non-ST Elevated Myocardial Infarction ,Pulmonary Embolism ,Cardiology and Cardiovascular Medicine ,Creatine Kinase ,Anterior Wall Myocardial Infarction ,Biomarkers ,Retrospective Studies - Abstract
The aim of this study was to investigate the value of electrocardiograms (ECGs) and serological examinations in the differential diagnosis of acute pulmonary embolism (APE) and acute non-ST elevation myocardial infarction (NSTEMI) in order to reduce the rate of clinical misdiagnosis.The clinical data of 37 patients with APE and 103 patients with NSTEMI admitted to our hospital were retrospectively analyzed. The differences in the clinical manifestations, ECGs, myocardial zymograms, D-dimers, and troponin (cTn) of the two groups were compared.In the patients with APE, the main symptom-found in 25 cases (67.56%)-was dyspnea, while in the patients with NSTEMI, the main symptom-found in 52 cases (50.49%)-was chest tightness. The incidences of sinus tachycardia and SWith the occurrence of clinical manifestations like dyspnea, chest tightness, chest pain, and palpitation of unknown causes, the possibility of APE and NSTEMI should be considered.
- Published
- 2021
41. Energy-efficient, area-efficient, high-accuracy and low-complexity switching scheme for SAR ADC.
- Author
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Yunfeng Hu, Zichuan Yi, Zhihong He, and Bin Li 0007
- Published
- 2017
- Full Text
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42. Numerical analysis of turbulence radiation interaction effect on radiative heat transfer in a swirling oxyfuel furnace
- Author
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Xiao Yang, Qinglin Niu, He-Ping Tan, Zhihong He, and Shikui Dong
- Subjects
Fluid Flow and Transfer Processes ,Materials science ,Turbulence ,020209 energy ,Mechanical Engineering ,Numerical analysis ,02 engineering and technology ,Mechanics ,Radiation ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Combustion ,Radiation Interaction ,Heat flux ,Thermal radiation ,0202 electrical engineering, electronic engineering, information engineering ,Radiative transfer ,0210 nano-technology - Abstract
With the application of oxyfuel combustion technology, the status of radiative heat transfer in oxyfuel flames is prominent, and accurate description of it is essential. This study simulates the turbulence radiation interaction (TRI) in a swirling gas-fired furnace to understand the thermal radiation behavior under oxycombustion conditions. Employing the non-gray weighted sum of gray gases model calculates the radiative properties of the participating media and the TRI is modeled. The effects of TRI on the radiative heat transfer in the furnace under different oxycombustion conditions and swirl numbers are analyzed. The results show that the effects of thermal radiation on temperature fields are critical in the gas-fired furnace, especially for oxycombustion condition with high oxygen concentration, and the same is true for TRI effect. With the increase of O2 concentration in O2/CO2 oxidizer, the radiative heat flux on the chamber wall, the radiative heat flux contribution to total heat flux, and the net radiative heat loss are increased. Increasing swirl number can weaken the TRI effect. It is observed that with 35% O2 in oxidizer, the radiation contribution to heat flux along the entire wall and local increase of radiative heat flux due to TRI effect are almost than 45% and 18%, respectively.
- Published
- 2019
43. Efficacy and safety of leflunomide in IgA nephropathy: a systematic review and meta-analysis
- Author
-
Si Feng, Jianwei Yi, Zhihong He, and Shizhang Xu
- Subjects
Nephrology ,medicine.medical_specialty ,Cyclophosphamide ,Urology ,030232 urology & nephrology ,Renal function ,030204 cardiovascular system & hematology ,Gastroenterology ,law.invention ,Nephropathy ,03 medical and health sciences ,0302 clinical medicine ,Randomized controlled trial ,law ,Internal medicine ,Humans ,Medicine ,Leflunomide ,medicine.diagnostic_test ,business.industry ,Glomerulonephritis, IGA ,medicine.disease ,Clinical trial ,Treatment Outcome ,Renal biopsy ,business ,Immunosuppressive Agents ,medicine.drug - Abstract
The optimal therapy for immunoglobulin A nephropathy (IgAN) remains uncertain. Leflunomide (LEF) is an immunosuppressive drug which may reduce deposition of glomerular autoantibodies and immune complexes. Several clinical trials were designed to evaluate the efficacy of LEF, but their results were controversial. Ovid Medline, Embase, the Cochrane Library, PubMed, and CNKI were systematically searched. Search terms included (“glomerulonephritis” OR “nephritis”) AND (“immunoglobulin A” OR “IgA”) AND “leflunomide”. Studies in which patients were diagnosed with IgAN based on renal biopsy were included. Studies needed to report clinical outcomes via either short- or long-term clinical examination, remission rate, or complication rate. Forty-four studies encompassing 1802 patients were included, of which 35 were randomized controlled trials. Results of 24 h post-treatment urine protein tests and serum creatinine tests were significantly lower in patients treat with LEF and corticosteroids (CS) or valsartan (ACEI) (CS + LEF or CS + ACEI) compared with patients treated with CS or ACEI alone (P
- Published
- 2019
44. Numerical analysis of point-source infrared radiation phenomena of rocket exhaust plumes at low and middle altitudes
- Author
-
Xinhu Duan, Qinglin Niu, Xiaying Meng, Zhihong He, and Shikui Dong
- Subjects
business.product_category ,Liquid-propellant rocket ,Point source ,Attenuation ,02 engineering and technology ,Spectral bands ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Plume ,Computational physics ,010309 optics ,Rocket ,0103 physical sciences ,Radiance ,Radiative transfer ,Environmental science ,0210 nano-technology ,business ,Physics::Atmospheric and Oceanic Physics - Abstract
Rocket exhaust plume treated as a significant radiation source has been widely used in space-based detection. In this paper, infrared radiation signatures of plumes were studied in the view of the phenomenon. The reacting plume flows were calculated by an axisymmetric computational fluid dynamics (CFD) solver. Radiative properties of gases were evaluated with the statistical narrow-band (SNB) model by relying on the NASA-3080 database. The line-of-sight (LOS) based on the single-line-group (SLG) approximation was employed for radiative transfer computations. The numerical model was validated against reference data. Based on this model, radiation characteristics of Atlas-II liquid rocket plumes were computed and analyzed in aspects of afterburning, atmospheric attenuation, spectral bands and observation angle. Results show that afterburning has a significant improvement in the wavelengths of 1.5–6.0 μm. Also, the atmospheric attenuation greatly decreases the plume radiance at low altitudes but it can be ignored above 40 km. Radiance is strongly dependent on the spectral bands. The altitude-varying spectral dependency can contribute to the rocket altitude estimation. The effect of the observation angle on the radiance distributions is varying with the spectra band and the flight altitude. These results are helpful for the design of the rocket motors and the application of the infrared detecting system.
- Published
- 2019
45. Evaluation of the non-gray weighted sum of gray gases models for radiative heat transfer in realistic non-isothermal and non-homogeneous flames using decoupled and coupled calculations
- Author
-
He-Ping Tan, Xiao Yang, Zhihong He, and Shikui Dong
- Subjects
Fluid Flow and Transfer Processes ,Physics ,Cfd simulation ,business.industry ,Mechanical Engineering ,02 engineering and technology ,Mechanics ,Computational fluid dynamics ,Radiant heat ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Combustion ,01 natural sciences ,Isothermal process ,010305 fluids & plasmas ,Heat flux ,Thermal radiation ,Non homogeneous ,0103 physical sciences ,0210 nano-technology ,business - Abstract
Radiative heat transfer plays an important role in combustion systems. Good compromise between the accuracy and computational requirements of the weighted sum of gray gases (WSGG) model makes it widely used in CFD simulations. In this paper, the accuracy of various WSGG models is assessed by the comparison with the results of radiative heat source and heat flux calculated by line by line (LBL) approach in a realistic non-isothermal and non-homogeneous flame using decoupled calculations. Then these models are implemented to CFD code to investigate the radiative heat transfer for a 600 kW furnace using coupled calculations. The experimental data from the furnace has been used to evaluate the computational applicability and reliability of WSGG models. Results show that the non-gray formulation of WSGG model is more accurate than gray modelling approach, compared with LBL results. The non-gray WSGG models of Krishnamoorthy et al. (2013), Bordbar et al. (2014) and Shan et al. (2018) provide the minimal overall errors compared with the measured temperature fields. The results demonstrate that using the non-gray approach instead of gray approach for global CFD simulation improves the simulation accuracy of thermal radiation transfer. The computing time of non-gray models is larger, approximately 3–4 times that of gray WSGG models.
- Published
- 2019
46. Metformin combined with nelfinavir induces SIRT3/mROS-dependent autophagy in human cervical cancer cells and xenograft in nude mice
- Author
-
Chenglai Xia, Zhihong He, Jie Yang, Shaofen Liang, Shibo Jiang, Weikang Xu, Guohong Xiao, and Ruihong Chen
- Subjects
0301 basic medicine ,SIRT3 ,Mice, Nude ,Uterine Cervical Neoplasms ,Mice ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Nude mouse ,Sirtuin 3 ,Lactate dehydrogenase ,Antineoplastic Combined Chemotherapy Protocols ,Autophagy ,medicine ,Animals ,Humans ,Hypoglycemic Agents ,Cytotoxicity ,Pharmacology ,Mice, Inbred BALB C ,Nelfinavir ,biology ,HIV Protease Inhibitors ,biology.organism_classification ,Xenograft Model Antitumor Assays ,Metformin ,Tumor Burden ,Blot ,030104 developmental biology ,chemistry ,Cancer research ,Female ,Reactive Oxygen Species ,030217 neurology & neurosurgery ,HeLa Cells ,medicine.drug - Abstract
The molecular mechanisms underlying the antineoplastic properties of metformin combined with nelfinavir remain elusive. To explore this question, transmission electron microscopy (TEM) was used to observe the combinatorial effect of inducing autophagosome formation in human cervical cancer cells. Western blotting respectively assayed protein expression of LC3I, LC3II, Beclin-1, Autophagy-related protein 7 (Atg7), Autophagy-related protein 3 (Atg3), NAD-dependent deacetylase sirtuin-3 (SIRT3) and major histocompatibility complex class I chain-related gene A (MICA). Lactate dehydrogenase (LDH) cytotoxicity assay evaluated natural killer (NK) cell cytotoxicity in the presence of metformin and nelfinavir in combination or each drug alone. Using tumor xenografts in a nude mouse model, antitumor efficacy of the drug combination was assessed. We found that the drug combination could induce autophagosome formation in human cervical cancer cells. The biomarker proteins of autophagy, including Beclin-1, Atg7 and Atg3, decreased, but the ratios of LC3I/II increased. We also found that this drug combination sensitizes human cervical cancer cells to NK cell-mediated lysis by increasing the protein of SIRT3 and MICA. Moreover, this drug combination markedly induced autophagy of SiHa xenografts in nude mice. Therefore, it can be concluded that metformin, in combination with nelfinavir, can induce SIRT3/mROS-dependent autophagy and sensitize NK cell-mediated lysis in human cervical cancer cells and cervical cancer cell xenografts in nude mice. Thus, our findings have revealed the detailed molecular mechanisms underlying the antitumor effects of metformin in combination with nelfinavir in cervical cancer.
- Published
- 2019
47. Numerical investigations on combustion and emission characteristics of a novel elliptical jet-stabilized model combustor
- Author
-
Zhihong He, Shikui Dong, Penghua Qiu, Xiao Yang, and He-Ping Tan
- Subjects
Jet (fluid) ,Materials science ,Turbulence ,020209 energy ,Mechanical Engineering ,02 engineering and technology ,Building and Construction ,Mechanics ,Combustion ,Pollution ,Industrial and Manufacturing Engineering ,Liquid fuel ,General Energy ,020401 chemical engineering ,Thermal radiation ,Thermal ,0202 electrical engineering, electronic engineering, information engineering ,Combustor ,Mass flow rate ,0204 chemical engineering ,Electrical and Electronic Engineering ,Civil and Structural Engineering - Abstract
In this study, a novel elliptical jet-stabilized combustor is developed; the combustion and emission characteristics are numerically investigated and compared with those of a circular jet-stabilized combustor. Five elliptical combustors with different semi-major/semi-minor axis ratios (1.00, 1.27, 1.56, 1.89, and 2.25) are considered, and an optimization method for adjustable stabilizer jet air supply is proposed. An Eulerian-Lagrangian approach is used for solving the liquid fuel spray. Employing the realizable k-e turbulence model and the finite-rate/eddy-dissipation model simulates the turbulent combustion. The discrete ordinate method is used to model thermal radiation, and the thermal and prompt NO formations are to be predictive of NO emissions. The numerical models are validated against available experimental data. The results show that the semi-major/semi-minor axis ratio significantly affects the performance of elliptical jet-stabilized combustors. To improve the temperature uniformity and to reduce NO emissions, the proposed optimization method is successfully applied. Compared with the circular combustor, the optimized elliptical combustor achieves strong mixing performance, resulting in improved combustion and emission performance. By adjusting the major/minor axis jet mass flow rate ratio (ma/mb = 0.6) in the elliptical combustor with semi-major/semi-minor axis ratio of 1.56, NO emissions are reduced by 50% compared with the circular combustor.
- Published
- 2019
48. Numerical analysis of thermal radiation noise of shock layer over an infrared optical dome at near-ground altitudes
- Author
-
Peng Gao, Zhihong He, Shikui Dong, Qinglin Niu, and Zhichao Yuan
- Subjects
Materials science ,Infrared ,Astrophysics::Instrumentation and Methods for Astrophysics ,02 engineering and technology ,Radius ,Radiation ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Computational physics ,010309 optics ,Dome (geology) ,Thermal radiation ,0103 physical sciences ,Radiative transfer ,0210 nano-technology ,Radiant intensity ,Noise (radio) - Abstract
To examine the effect of atmospheric trace species on the infrared thermal radiation of a supersonic dome, a series of radiation characteristics with different geometry sizes at near-ground altitudes were investigated numerically. The conjugate heat transfer method was applied to build the heat transfer model of the optical dome. Three major radiating species of H2O, CO2, and CO were taken into account in the shock layer. A line-by-line (LBL) method was used for evaluating the radiative properties of species. A line-of-sight (LOS) approach was applied to solve the radiative transfer equation (RTE). The simulated and measured results of the dome were also proposed to validate the numerical method. The effects of the dome geometry size, the dome material and the time-varying altitude on the infrared radiation noise were studied in detail. The results show that the altitude-varying radiation intensity along the LOS is related to the ambient density and velocity. The variation of the dome radius is proportional to the total radiation received on the dome surface. It is observed that the maximum radiation intensity along the LOS does not occur in the normal direction of the receiving point, but it is determined by both the flow field parameters and the path length. Also, the radiation increment corresponding to different dome sizes approximately obeys a Gaussian distribution related to the product of density and velocity.
- Published
- 2019
49. Enhancement of thermal performance by converging-diverging channel in a micro tube combustor fueled by premixed hydrogen/air
- Author
-
Xiao Yang, He-Ping Tan, Zhihong He, and Shikui Dong
- Subjects
Work (thermodynamics) ,Materials science ,Hydrogen ,Renewable Energy, Sustainability and the Environment ,Energy conversion efficiency ,Energy Engineering and Power Technology ,chemistry.chemical_element ,02 engineering and technology ,Mechanics ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Fuel Technology ,chemistry ,Thermophotovoltaic ,Thermal ,Combustor ,0210 nano-technology ,Common emitter ,Dimensionless quantity - Abstract
As the core component of the micro thermophotovoltaic (MTPV) system, the micro combustor with a high and uniform wall temperature distribution is beneficial to improve the energy conversion efficiency. In this paper, a micro tube combustor with converging-diverging channel is proposed and the thermal performance is numerically investigated, compared with that of the micro combustor with cylindrical channel. The effects of inlet velocity of H2/air mixture, dimensionless position and diameter of throat, and solid material on the thermal performance are widely analyzed. Results show that the outer wall temperature and emitter efficiency of the micro combustor with converging-diverging channel are higher than that of the micro combustor with cylindrical channel, and the converging-diverging channel has more uniform temperature distribution. The converging-diverging micro combustor with dimensionless throat position l = 0.375 and dimensionless throat diameter β = 0.4 is more suitable for the application of MTPV system. When H2/air inlet velocity is 11 m/s and H2/air equivalence ratio is 1.0, the mean wall temperature is increased by 82.39 K and the emitter efficiency is increased by 6.59%, while the normalized temperature standard deviation is reduced by 65.85%. Additionally, the use of SiC as wall material can improve the thermal performance of the micro combustor. It is worth noting that this work will offer us significant guidelines for the optimized work of micro tube combustor.
- Published
- 2019
50. Long noncoding RNA GIHCG functions as an oncogene and serves as a serum diagnostic biomarker for cervical cancer
- Author
-
Lihua Li, Zhihong He, Naiqun Wang, Lihua Mao, Xiaolian Zhang, and Yanfeng Song
- Subjects
0301 basic medicine ,Cervical cancer ,microRNA ,Oncogene ,cervical cancer ,diagnosis ,Cell growth ,business.industry ,Cell migration ,medicine.disease ,Long non-coding RNA ,03 medical and health sciences ,030104 developmental biology ,0302 clinical medicine ,Oncology ,oncogene ,Apoptosis ,Cell culture ,030220 oncology & carcinogenesis ,medicine ,Cancer research ,long noncoding RNA ,business ,Research Paper - Abstract
Cervical cancer is the most common and lethal gynaecological tumor. Long noncoding RNAs (lncRNAs) have critical roles in various cancers, including cervical cancer. However, few studies investigated the diagnostic value of lncRNAs for cervical cancer. In this study, we investigated the expression pattern of a recently identified lncRNA GIHCG in cervical cancer tissues, cell lines, and serums by qRT-PCR. Furthermore, we explored the roles of GIHCG in cervical cancer using gain-of-function and loss-of-function assays. Our results revealed that GIHCG is up-regulated in cervical cancer tissues and cell lines compared with adjacent normal tissues and normal cervical epithelial cell line, respectively. Furthermore, serum GIHCG is significantly up-regulated in cervical cancer patients compared with healthy controls. ROC curve analysis revealed that serum GIHCG could accurately discriminate cervical cancer patients from healthy controls. Functionally, we found that overexpression of GIHCG promotes cell proliferation, inhibits cell apoptosis, and promotes cell migration of cervical cancer cells. Conversely, depletion of GIHCG inhibits cell proliferation, induces cell apoptosis, and inhibits cell migration of cervical cancer cells. Mechanistically, we found that GIHCG represses the expression of miR-200b. The expression of miR-200b is inversely correlated with the expression of GIHCG in cervical cancer tissues. Moreover, overexpression of miR-200b attenuates the roles of GIHCG in promoting cervical cancer tumor growth in vivo. In summary, this study demonstrated that GIHCG functions as an oncogene in cervical cancer via repressing miR-200b. This study also suggested that GIHCG may be a non-invasive diagnostic biomarker and a potential therapeutic target for cervical cancer.
- Published
- 2019
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