76 results on '"Shuzhen Yu"'
Search Results
2. Stability Analysis of a Delayed Rumor Propagation Model with Nonlinear Incidence Incorporating Impulsive Vaccination
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Yuqian Zhou, Haijun Jiang, Xupeng Luo, and Shuzhen Yu
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rumor propagation ,impulsive vaccination ,nonlinear incidence ,time delay ,Science ,Astrophysics ,QB460-466 ,Physics ,QC1-999 - Abstract
The presence of information asymmetry can hinder the public’s ability to make well-informed decisions, resulting in unwarranted suspicion and the widespread dissemination of rumors. Therefore, it is crucial to provide individuals with consistent and dependable scientific education. Regular popular science education is considered a periodic impulsive intervention to mitigate the impact of information asymmetry and promote a more informed and discerning public. Drawing on these findings, this paper proposes a susceptible-hesitant-infected-refuting-recovered (SHIDR) rumor-spreading model to explain the spread of rumors. The model incorporates elements such as time delay, nonlinear incidence, and refuting individuals. Firstly, by applying the comparison theorem of an impulsive differential equation, we calculate two thresholds for rumor propagation. Additionally, we analyze the conditions of global attractiveness of the rumor-free periodic solution. Furthermore, we consider the condition for the rumor’s permanence. Finally, numerical simulations are conducted to validate the accuracy of our findings. The results suggest that increasing the proportion of impulsive vaccination, reducing the impulsive period, or prolonging the delay time can effectively suppress rumors.
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- 2023
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3. Optimization of direct assessment technology for internal corrosion of gathering and transmission pipelines in Changqing Gas Field
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Fanghui ZHU, Zhiping ZHOU, Xuehu WU, Qiongwei LI, Mingxing LI, Wei LIU, and Shuzhen YU
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gas field ,pipelines ,internal corrosion ,direct assessment ,Oils, fats, and waxes ,TP670-699 ,Gas industry ,TP751-762 - Abstract
For the operation mode of the production, gathering and transmission pipelines is diversified in the Changqing Gas Field, and the flow state and corrosion environment vary greatly, there is a large error between the actual detection and the detection using the prediction model specified in the technical standard of internal corrosion direct assessment. Considering the characteristics of the operating conditions of the gathering and transmission pipelines in Changqing Gas Field, a three-dimensional flow pattern distribution map was plotted based on the gas set, water-gas ratio and pipeline inclination with the Fluent and SolidWorks softwares. In addition, a corrosion prediction model suitable for the actual operating condition parameters was established and optimized based on the De WarrD and SwRI models. Through the detection and verification at 31 excavation points along 9 pipelines, it is shown that the prediction coincidence degree of the detection points is up to 86.67%, which basically satisfies the requirement of pipeline corrosion risk discrimination, and the measures to enhance the accuracy of pipeline elevation-mileage data and reduce the locating error of excavation, etc., are helpful to improve the prediction coincidence degree.
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- 2021
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4. Stability, Hopf Bifurcation and Optimal Control of Multilingual Rumor-Spreading Model with Isolation Mechanism
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Shuzhen Yu, Zhiyong Yu, and Haijun Jiang
- Subjects
stability ,rumor spreading ,online social networks ,Hopf bifurcation ,optimal control ,Mathematics ,QA1-939 - Abstract
The propagation of rumors on online social networks (OSNs) brings an awful lot of trouble to people’s life and society. Aiming at combating rumors spreading on OSNs, two novel rumor-propagation models without and with time delays are proposed, which combine with the influence of the immune mechanism, isolation mechanism and network structure. Firstly, we analyze the existence of rumor equilibria and obtain some existence conditions of backward bifurcation. Secondly, the local stabilities of rumor-free and rumor equilibria are proved by using the Jacobian matrix method, and some critical conditions for the existence of Hopf bifurcation are acquired by selecting critical parameters and delays as bifurcation parameters. Furthermore, an optimal control method is proposed, which can prevent the spread of rumors within an expected time period and minimize the cost of control. Finally, some numerical simulations are provided to verify the effectiveness of the proposed theoretical results.
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- 2022
- Full Text
- View/download PDF
5. Effects of propofol pretreatment on myocardial cell apoptosis and SERCA2 expression in rats with hepatic ischemia/reperfusion
- Author
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Shuzhen Yu, Yongqing Guo, Weiwei Zhang, Lina Zheng, Junming Ren, Jianmin Jin, Baofeng Yu, Yu Zhang, Hao Wang, and Yuhong Zhang
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Propofol ,Liver ,Reperfusion injury ,Myocardium ,Endoplasmic reticulum Ca2+-ATPase2 ,Anesthesiology ,RD78.3-87.3 - Abstract
Abstract Introduction: Hepatic ischemia-reperfusion injury is a common pathophysiological process in liver surgery. Whether Propofol can reduce myocardial ischemia-reperfusion injury induced by hepatic ischemia-reperfusion injury in rats, together with related mechanisms, still needs further studies. Objective: To investigate if propofol would protect the myocardial cells from apoptosis with hepatic ischemia-reperfusion injury. Methods: Male Sprague-Dawley rats (n = 18) were randomly allocated into three groups: Sham Group (Group S, n = 6), Hepatic Ischemia-reperfusion Injury Group (Group IR, n = 6) and Propofol Group (Group P, n = 6). Group S was only subjected to laparotomy. Group IR was attained by ischemia for 30 min and reperfusion for 4 h. Group P was subjected identical insult as in Group IR with the administration of propofol started 10 min before ischemia with 120 mg.kg−1, following by continuous infusion at 20 mg.kg−1.h−1. Cell apoptosis was examined by terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling assay. Endoplasmic reticulum Ca2+-ATPase2 (SERCA2) and cysteine-containing aspartic acid cleaved-caspase3 (cleaved-caspase3) were assayed by western blot and Altimeter polymerase chain reaction. Results: Apoptosis rate was increased, with mRNA and protein of SERCA2 down-regulated and cleaved-caspase3 up-regulated in Group IR compared with Group S (p < 0.01). Apoptosis rate was decreased, with mRNA and protein of SERCA2 up-regulated and cleaved-caspase3 down-regulated in Group P compared with Group IR (p < 0.01). Conclusions: Propofol can reduce hepatic ischemia-reperfusion injury-induced myocardial cell apoptosis, meanwhile, can up-regulate mRNA and protein of SERCA2 in rats.
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- 2018
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6. Dynamic Analysis and Optimal Control of ISCR Rumor Propagation Model with Nonlinear Incidence and Time Delay on Complex Networks
- Author
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Zhongxue Chang, Haijun Jiang, Shuzhen Yu, and Shanshan Chen
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Mathematics ,QA1-939 - Abstract
An Innocents-Spreaders-Calmness-Removes (ISCR) rumor propagation model is established with nonlinear incidence and time delay on complex networks in this paper. Based on the mean-field theory, the spreading dynamics of the ISCR model are discussed in detail. Firstly, the basic reproduction number R0 is obtained by the next generation matrix method to ensure the existence of rumor-prevailing equilibrium. Secondly, by utilizing the Routh–Hurwitz criterion and LaSalle’s invariance principle, the local stability and global stability of rumor equilibria are proved. Moreover, the optimal control is presented via Pontryagin’s minimum principle, which is to effectively restrain rumor diffusion. Finally, the theoretical results are verified by numerical simulations.
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- 2021
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7. Dynamic Analysis and Optimal Control of Rumor Spreading Model with Recurrence and Individual Behaviors in Heterogeneous Networks
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Xinru Tong, Haijun Jiang, Xiangyong Chen, Shuzhen Yu, and Jiarong Li
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rumor propagation ,heterogeneous networks ,rumor recurrence ,individual behaviors ,optimal control ,model application ,Science ,Astrophysics ,QB460-466 ,Physics ,QC1-999 - Abstract
This paper is devoted to investigating the impact of the recurrence of rumors and individual behaviors and control strategies related to rumor spreading in online social networks. To do this, a novel susceptible-hesitating-infected-latent-recovered (SHILR) rumor propagation model in heterogeneous networks is presented. Firstly, based on the relevant mean-field equations of the model, the threshold value is examined to demonstrate the existence and stability of rumor-free/spreading equilibrium with the help of the algebraic method. Secondly, the global stabilities of the equilibria are analyzed through applying Lyapunov stability theory and LaSalle’s invariance principle. Next, the optimal control is proposed by taking advantage of Pontryagin’s maximum principle for reducing the number of infected individuals with minimum cost. Moreover, some numerical examples are carried out to test the theoretical results. Finally, combined with practice, a model application is presented.
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- 2022
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8. MicroRNA Transcriptomes Relate Intermuscular Adipose Tissue to Metabolic Risk
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Mingzhou Li, Xuewei Li, Anan Jiang, Lei Chen, Jinyong Wang, Jian Xiao, Yanzhi Jiang, Lin Bai, Shuzhen Yu, Fengjiao Wang, and Jideng Ma
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intermuscular adipose tissue (IMAT) ,metabolic risk ,miRNA ,pig ,immune response ,inflammation response ,obesity ,transcriptome ,Biology (General) ,QH301-705.5 ,Chemistry ,QD1-999 - Abstract
Intermuscular adipose tissue is located between the muscle fiber bundles in skeletal muscles, and has similar metabolic features to visceral adipose tissue, which has been found to be related to a number of obesity-related diseases. Although various miRNAs are known to play crucial roles in adipose deposition and adipogenesis, the microRNA transcriptome of intermuscular adipose tissue has not, until now, been studied. Here, we sequenced the miRNA transcriptomes of porcine intermuscular adipose tissue by small RNA-sequencing and compared it to a representative subcutaneous adipose tissue. We found that the inflammation- and diabetes-related miRNAs were significantly enriched in the intermuscular rather than in the subcutaneous adipose tissue. A functional enrichment analysis of the genes predicted to be targeted by the enriched miRNAs also indicated that intermuscular adipose tissue was associated mainly with immune and inflammation responses. Our results suggest that the intermuscular adipose tissue should be recognized as a potential metabolic risk factor of obesity.
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- 2013
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9. The dynamic analysis of the rumor spreading and behavior diffusion model with higher-order interactions.
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Yang Xia, Haijun Jiang, Shuzhen Yu, and Zhiyong Yu 0002
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- 2024
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10. Bridging computer and education sciences: A systematic review of automated emotion recognition in online learning environments.
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Shuzhen Yu, Alexey Androsov, Hanbing Yan, and Yi Chen
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- 2024
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11. Fixed-time consensus for multi-agent systems with objective optimization on directed detail-balanced networks.
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Zhiyong Yu 0002, Jian Sun 0003, Shuzhen Yu, and Haijun Jiang
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- 2022
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12. The dynamics and control of 2I2SR rumor spreading models in multilingual online social networks.
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Shuzhen Yu, Zhiyong Yu 0002, Haijun Jiang, and Shuai Yang
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- 2021
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13. Observer-based distributed consensus for multi-agent systems with directed networks and input saturation.
- Author
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Shuzhen Yu, Zhiyong Yu 0002, Haijun Jiang, and Xuehui Mei
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- 2021
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14. Consensus of multi-agent systems with finite-time and fixed-time observation.
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Zhiyong Yu 0002, Shuzhen Yu, and Haijun Jiang
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- 2020
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15. Fixed‐time distributed optimization for multi‐agent systems with external disturbances over directed networks
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Zhiyong Yu, Jian Sun, Shuzhen Yu, and Haijun Jiang
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Control and Systems Engineering ,Mechanical Engineering ,General Chemical Engineering ,Biomedical Engineering ,Aerospace Engineering ,Electrical and Electronic Engineering ,Industrial and Manufacturing Engineering - Published
- 2022
16. High-Voltage 1064 nm InGaAsP Multijunction Laser Power Converters
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Jiajing Yin, Yurun Sun, Ancheng Wang, Shuzhen Yu, Junsheng Wang, Qiuxue Fu, Jie Qin, Yanhui Han, Wei Zhang, Shuming Zhang, Cong Xue, and Jianrong Dong
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Electrical and Electronic Engineering ,Electronic, Optical and Magnetic Materials - Published
- 2022
17. Stability, Hopf Bifurcation and Optimal Control of Multilingual Rumor-Spreading Model with Isolation Mechanism
- Author
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Zhiyong Yu, Haijun Jiang, and Shuzhen Yu
- Subjects
General Mathematics ,Computer Science (miscellaneous) ,stability ,rumor spreading ,online social networks ,Hopf bifurcation ,optimal control ,Engineering (miscellaneous) - Abstract
The propagation of rumors on online social networks (OSNs) brings an awful lot of trouble to people’s life and society. Aiming at combating rumors spreading on OSNs, two novel rumor-propagation models without and with time delays are proposed, which combine with the influence of the immune mechanism, isolation mechanism and network structure. Firstly, we analyze the existence of rumor equilibria and obtain some existence conditions of backward bifurcation. Secondly, the local stabilities of rumor-free and rumor equilibria are proved by using the Jacobian matrix method, and some critical conditions for the existence of Hopf bifurcation are acquired by selecting critical parameters and delays as bifurcation parameters. Furthermore, an optimal control method is proposed, which can prevent the spread of rumors within an expected time period and minimize the cost of control. Finally, some numerical simulations are provided to verify the effectiveness of the proposed theoretical results.
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- 2022
- Full Text
- View/download PDF
18. Distributed consensus for multi‐agent systems via adaptive sliding mode control
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Haijun Jiang, Shuzhen Yu, Zhiyong Yu, and Cheng Hu
- Subjects
Consensus ,Control and Systems Engineering ,Control theory ,Computer science ,Mechanical Engineering ,General Chemical Engineering ,Multi-agent system ,Biomedical Engineering ,Aerospace Engineering ,Electrical and Electronic Engineering ,Sliding mode control ,Industrial and Manufacturing Engineering - Published
- 2021
19. Photo-and thermo-regulation by photonic crystals for extended longevity of C. elegans
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Shuzhen Yu, Yating Shao, Qineng Qiu, Yu Cheng, Renkun Qing, Cai-Feng Wang, Su Chen, and Chen Xu
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Aging ,Developmental Biology - Published
- 2023
20. The study on corrosion inhibition effect of 2-Phenylbenzimidazole for X70 steel in HCl solution at 308 K
- Author
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Boyuan Ran, Zhengnan Wei, Shuzhen Yu, Hui Zhi, Songtao Yan, Shuangyu Cai, Lei Wen, Baomin Fan, Jiancheng Wang, Kaiwei Wang, and Xiaofang Luo
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Electrochemistry - Published
- 2023
21. Dynamic analysis and optimal control of a reaction-diffusion rumor propagation model in multi-lingual environments
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Yang Xia, Haijun Jiang, Zhiyong Yu, Shuzhen Yu, and Xupeng Luo
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Applied Mathematics ,Analysis - Published
- 2023
22. A review on the protective effect of active components in Antrodia camphorata against alcoholic liver injury
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Xiaofeng Liu, Shuzhen Yu, Yao Zhang, Wei Zhang, Hao Zhong, Xiaoqin Lu, and Rongfa Guan
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Pharmacology ,Superoxide Dismutase ,Anti-Inflammatory Agents ,Succinates ,Vitamins ,Lignin ,Antioxidants ,Triterpenes ,Sterols ,Drug Discovery ,Antrodia ,Humans ,Amino Acids ,Inflammation Mediators ,Polyporales ,Liver Diseases, Alcoholic - Abstract
Antrodia camphorata is a genus of wood-rot basidiomycete in the family Fomitopsidaceae. It is a valuable medicinal fungus in China that contains more than 78 kinds of active compounds. A. camphorata has good protection effects on the liver, especially on alcoholic liver injury (ALI).This paper summarizes the complex occurrence and development of alcoholic liver disease (ALD). In addition, the effect of ALD on the intestine through the gut-liver axis is summarized. The protective mechanism of A. camphorata on ALI is reviewed to reveal its therapeutic potential, offering insights into future research.A comprehensive search in the literature was obtained from books and online databases such as Web of Science, Google Scholar, PubMed, Scopus, Science direct, ACS Publications and Baidu Scholar.The pathogenesis of ALD mainly includes oxidative stress injury, intestinal microflora imbalance, inflammatory mediator injury and nutritional imbalance. A. camphorata contains rich active components (e.g. polysaccharides, triterpenoids, maleic and succinic acid derivatives, amino acids, superoxide dismutase, vitamins, lignin and sterols). These components have good antioxidant, anti-inflammatory and intestinal protection activities. Therefore, A. camphorata has a wide application in the prevention and treatment of ALI.ALD develops from a mild disease to alcoholic hepatitis and cirrhosis, which is the main reason of global morbidity and mortality. At present, there is no effective drug for the treatment of ALD. A. camphorata, as a valuable medicinal fungus unique to Taiwan, has a great protective effect on the liver. It is expected to be an effective drug for ALI treatment. Although many studies have performed the protective effects of A. camphorata on ALI, its regulatory effects on the gut-liver axis of ALD patients need to be further explored.
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- 2022
23. Distributed fixed-time optimization for multi-agent systems over a directed network
- Author
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Haijun Jiang, Zhiyong Yu, Shuzhen Yu, and Xuehui Mei
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Mathematical optimization ,Optimization problem ,Computer science ,Applied Mathematics ,Mechanical Engineering ,Multi-agent system ,Regular polygon ,Aerospace Engineering ,Value (computer science) ,Sign function ,Ocean Engineering ,Function (mathematics) ,Interval (mathematics) ,01 natural sciences ,Control and Systems Engineering ,Distributed algorithm ,0103 physical sciences ,Electrical and Electronic Engineering ,010301 acoustics - Abstract
This paper proposes some distributed algorithms to solve the multi-agent optimization problem with equality constraints, in which the team objective is a sum of local convex objective functions. Firstly, a directed network related to equality constraints is constructed before converting the constrained optimization problem into an unconstrained one. Secondly, a continuous algorithm is designed by using local information of agents, and the objective function converges to the global optimum in a fixed-time interval. Moreover, in order to reduce the communication cost, an event-triggered algorithm with sign function is devised. It is found that the optimal value can be achieved in a fixed-time interval, but the sign function can cause high-frequency chattering when the sate variables converge to the optimal value. Therefore, an event-triggered algorithm with saturation function is proposed, which can effectively overcome this disadvantage. Finally, the proposed algorithms are verified by some numerical simulations.
- Published
- 2021
24. Synthesis and washing aid properties of a polycarboxylate copolymer.
- Author
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Dangge Gao, Pengyu Li, Shuzhen Yu, Wei Liu, and Bin Lv
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ACRYLIC acid ,SODIUM tripolyphosphate ,SUCCINIC acid ,SURFACE tension ,CARBOXYLATES ,CARBOXYLATE derivatives ,PH effect - Abstract
Poly(ESA-AA-SAS-HPA) w a s synthesized by solution polymerization from epoxy succinic acid (ESA), acrylic acid (AA), sodium allyl sulfonate (SAS) and hydroxypropyl acrylate (HPA). It was characterized by FT-IR, ¹H NMR, TG and DLS. The effects of chelating pH, temperature and additive mass fraction on the washing aid performance of Poly(ESA-AA-SAS-HPA) were investigated. The results show that, compared with sodium tripolyphosphate, it has good washing aid performance, with the chelating amount of 308.7 mg/g and the calcium dispersing power of 101.5 mg/g. Poly (ESA-AA-SAS-HPA) has good synergism with sodium dodecylbenzene sulfonate (LAS), which can reduce the surface tension of the system to 45 mN/m. [ABSTRACT FROM AUTHOR]
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- 2023
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25. The spread and control of rumors in a multilingual environment
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Zhiyong Yu, Jiarong Li, Haijun Jiang, Xuehui Mei, and Shuzhen Yu
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Lyapunov stability ,Original Paper ,Rumor spreading ,Correctness ,Computer science ,Applied Mathematics ,Mechanical Engineering ,Distributed computing ,Continuous control ,Control (management) ,Heterogeneous network ,Aerospace Engineering ,Ocean Engineering ,Rumor ,01 natural sciences ,Event-triggered impulsive control ,Control and Systems Engineering ,0103 physical sciences ,Multilingual environment ,Electrical and Electronic Engineering ,010301 acoustics ,Basic reproduction number ,Control methods - Abstract
This paper studies the rumor propagation model with heterogeneous networks in a multilingual environment. Firstly, a rumor propagation model with two language spreaders, in which the immunologic mechanism is considered in the ignorant, is proposed on heterogeneous networks. Secondly, the basic reproduction number and the dynamic behaviors are analyzed by using the next-generation matrix method and Lyapunov stability theory, respectively. Moreover, two control strategies are designed to effectively suppress the spread of the rumor. The one is continuous control strategy. By applying real-time control to the spreaders, the rumor spreading time can be greatly reduced and the rumor can die out in a short time. The other is event-triggered impulsive control strategy, which can effectively reduce the consumption of resources and ensure the extinction of the rumor. Finally, the correctness of theoretical analysis and the feasibility of control methods are verified by numerical simulations.
- Published
- 2020
26. Consensus of multi-agent systems with finite-time and fixed-time observation
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Shuzhen Yu, Haijun Jiang, and Zhiyong Yu
- Subjects
Lyapunov function ,Information Systems and Management ,Computer science ,Multi-agent system ,05 social sciences ,Control (management) ,050301 education ,02 engineering and technology ,Computer Science Applications ,Theoretical Computer Science ,Nonlinear system ,symbols.namesake ,Artificial Intelligence ,Control and Systems Engineering ,Fixed time ,Control theory ,0202 electrical engineering, electronic engineering, information engineering ,symbols ,020201 artificial intelligence & image processing ,State (computer science) ,0503 education ,Protocol (object-oriented programming) ,Software - Abstract
This paper addresses the distributed control problem of single-input high-order multi-agent systems (MASs). Firstly, a nonlinear observation system is proposed to track the target system in a finite-time, and a distributed event-triggered protocol is designed to reduce the frequency of data transmission. Moreover, we popularize the distributed event-triggered algorithm to general directed networks. Applying the tree-type error method and implicit Lyapunov functions, some criteria are derived to ensure the finite-time observation and asymptotical consensus. Furthermore, based on single-output state, a fixed-time nonlinear observer is introduced, and the asymptotical consensus is also considered utilizing the distributed event-triggered protocol. Finally, the effectiveness of the control strategies is demonstrated via some numerical simulations.
- Published
- 2020
27. Observer-based consensus for multi-agent systems with partial adaptive dynamic protocols
- Author
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Zhiyong Yu, Cheng Hu, Shuzhen Yu, and Haijun Jiang
- Subjects
Scheme (programming language) ,0209 industrial biotechnology ,Observer (quantum physics) ,Computer science ,Multi-agent system ,02 engineering and technology ,Directed spanning tree ,Computer Science Applications ,Computer Science::Multiagent Systems ,Nonlinear system ,020901 industrial engineering & automation ,Control and Systems Engineering ,Control theory ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,Observer based ,computer ,Analysis ,computer.programming_language - Abstract
This paper studies the consensus of multi-agent systems with linear and nonlinear dynamics, respectively. Based on a reordering scheme and the relative outputs of agents, two kinds of observer-based distributed control protocols are constructed, in which only the weights in the directed spanning tree need to be updated continuously. Randomly choosing a directed spanning tree and using the developed distributed adaptive laws, one can see that the consensus can be achieved under some mild assumptions on agents’ intrinsic dynamics. Finally, two examples are presented to illustrate the theoretical analysis.
- Published
- 2019
28. Polarization control of 795 nm vertical-cavity surface-emitting lasers by in-phase surface gratings
- Author
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Qiuxue Fu, Yurun Sun, Shuzhen Yu, Ancheng Wang, Jiajing Yin, and Jian-Rong Dong
- Subjects
Electrical and Electronic Engineering ,Engineering (miscellaneous) ,Atomic and Molecular Physics, and Optics - Abstract
795 nm vertical-cavity surface-emitting lasers (VCSELs) with in-phase surface gratings are fabricated and investigated theoretically and experimentally. The polarization characteristics of 795 nm VCSELs with various grating periods and depths are analyzed using the rigorous coupled-wave analysis (RCWA) method; the dependence of polarization stability on the profile of gratings demonstrates that the trapezoid grating ridge slightly enhances the orthogonal polarization suppression ratio (OPSR), but increases the threshold current. The fabricated VCSELs with a sub-wavelength in-phase surface grating of a duty cycle of 0.5 show stabilized output polarization at the cost of increasing the threshold current which is in agreement with the calculations. The grating VCSELs with a period of 200 nm and an oxide aperture of3.43µm×4.39µmproduce a single-mode output with an OPSR of 16.6 dB and a slope efficiency of 0.42 W/A at 85°C.
- Published
- 2022
29. Effects of propofol pretreatment on myocardial cell apoptosis and SERCA2 expression in rats with hepatic ischemia/reperfusion
- Author
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Yongqing Guo, Yu Zhang, Yuhong Zhang, Hao Wang, Junming Ren, Baofeng Yu, Shuzhen Yu, Weiwei Zhang, Lina Zheng, and Jianmin Jin
- Subjects
0301 basic medicine ,Male ,Ischemia ,Apoptosis ,030204 cardiovascular system & hematology ,Pharmacology ,Sarcoplasmic Reticulum Calcium-Transporting ATPases ,lcsh:RD78.3-87.3 ,Rats, Sprague-Dawley ,03 medical and health sciences ,Random Allocation ,0302 clinical medicine ,Western blot ,Anesthesiology ,Aspartic acid ,Medicine ,Animals ,Myocytes, Cardiac ,RD78.3-87.3 ,Propofol ,Endoplasmic reticulum Ca2+-ATPase2 ,medicine.diagnostic_test ,business.industry ,Endoplasmic reticulum ,Myocardium ,General Medicine ,medicine.disease ,Pathophysiology ,Rats ,Reperfusion injury ,030104 developmental biology ,Liver ,lcsh:Anesthesiology ,business ,Anesthetics, Intravenous ,medicine.drug - Abstract
Introduction: Hepatic ischemia-reperfusion injury is a common pathophysiological process in liver surgery. Whether Propofol can reduce myocardial ischemia-reperfusion injury induced by hepatic ischemia-reperfusion injury in rats, together with related mechanisms, still needs further studies. Objective: To investigate if propofol would protect the myocardial cells from apoptosis with hepatic ischemia-reperfusion injury. Methods: Male Sprague-Dawley rats (n = 18) were randomly allocated into three groups: Sham Group (Group S, n = 6), Hepatic Ischemia-reperfusion Injury Group (Group IR, n = 6) and Propofol Group (Group P, n = 6). Group S was only subjected to laparotomy. Group IR was attained by ischemia for 30 min and reperfusion for 4 h. Group P was subjected identical insult as in Group IR with the administration of propofol started 10 min before ischemia with 120 mg.kg−1, following by continuous infusion at 20 mg.kg−1.h−1. Cell apoptosis was examined by terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling assay. Endoplasmic reticulum Ca2+-ATPase2 (SERCA2) and cysteine-containing aspartic acid cleaved-caspase3 (cleaved-caspase3) were assayed by western blot and Altimeter polymerase chain reaction. Results: Apoptosis rate was increased, with mRNA and protein of SERCA2 down-regulated and cleaved-caspase3 up-regulated in Group IR compared with Group S (p
- Published
- 2018
30. Leader‐following guaranteed performance consensus for second‐order multi‐agent systems with and without communication delays
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Shuzhen Yu, Cheng Hu, Zhiyong Yu, and Haijun Jiang
- Subjects
Lyapunov stability ,0209 industrial biotechnology ,Control and Optimization ,Computer science ,Multi-agent system ,Linear matrix inequality ,Stability (learning theory) ,02 engineering and technology ,Leader following ,Upper and lower bounds ,Computer Science Applications ,Human-Computer Interaction ,020901 industrial engineering & automation ,Coupling (computer programming) ,Control and Systems Engineering ,Control theory ,Order (exchange) ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,Electrical and Electronic Engineering - Abstract
The leader-following guaranteed-performance consensus problems for second-order multi-agent systems with and without communication time delays are investigated, where a guaranteed performance function is proposed to consider the consensus regulation performance. For the case without the time delay, the coupling gain and pinning strength are carefully considered. When the time delays exist in the communication, we find that the inequality (Seuret and Gouaisbaut) cannot be used to investigate the consensus problems proposed in the study since the obtained conditions cannot be satisfied. Therefore, Jensen's inequality and Newton–Leibniz formula, which can solve this issue well, are introduced. By using the state space decomposition approach, linear matrix inequality and Lyapunov stability theory, some sufficient conditions are derived for achieving the guaranteed performance consensus. Moreover, the upper bound of the performance function is determined. Finally, two examples are shown to verify the validity of the theoretical results.
- Published
- 2018
31. Dynamic Analysis and Optimal Control of ISCR Rumor Propagation Model with Nonlinear Incidence and Time Delay on Complex Networks
- Author
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Shuzhen Yu, Zhongxue Chang, Shanshan Chen, and Haijun Jiang
- Subjects
Article Subject ,Invariance principle ,Computer science ,Computer Science::Social and Information Networks ,Complex network ,Rumor ,Optimal control ,Stability (probability) ,Next-generation matrix ,Modeling and Simulation ,QA1-939 ,Applied mathematics ,Diffusion (business) ,Basic reproduction number ,Mathematics - Abstract
An Innocents-Spreaders-Calmness-Removes (ISCR) rumor propagation model is established with nonlinear incidence and time delay on complex networks in this paper. Based on the mean-field theory, the spreading dynamics of the ISCR model are discussed in detail. Firstly, the basic reproduction number R 0 is obtained by the next generation matrix method to ensure the existence of rumor-prevailing equilibrium. Secondly, by utilizing the Routh–Hurwitz criterion and LaSalle’s invariance principle, the local stability and global stability of rumor equilibria are proved. Moreover, the optimal control is presented via Pontryagin’s minimum principle, which is to effectively restrain rumor diffusion. Finally, the theoretical results are verified by numerical simulations.
- Published
- 2021
32. Consensus of Multi-agent Systems with Feedforward Nonlinear Dynamics and Digraph
- Author
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Zhiyong Yu, Cheng Hu, Shuzhen Yu, and Haijun Jiang
- Subjects
0209 industrial biotechnology ,Strongly connected component ,Computer science ,Multi-agent system ,Feed forward ,02 engineering and technology ,Upper and lower bounds ,Computer Science Applications ,Computer Science::Multiagent Systems ,Nonlinear system ,020901 industrial engineering & automation ,Consensus ,Control and Systems Engineering ,Control theory ,Bounded function ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing - Abstract
This paper considers a high-order consensus problem of multi-agent system with feedforward nonlinear and time-varying input delay in a directed network. In order to achieve the consensus, we propose a low gain distributed protocol which can get rid of impacts of feedforward nonlinearity and an arbitrarily bounded input delay on the consensus problem. Moreover, for any upper bound time-varying delay and strongly connected diagraph, the proposed controller can solve the consensus problem of multi-agent systems with feedforward nonlinearity if the designed parameter θ is great than the threshold value. Finally, several numerical simulations are presented to demonstrate the validity of the theoretical results.
- Published
- 2018
33. Dynamical study and event-triggered impulsive control of rumor propagation model on heterogeneous social network incorporating delay
- Author
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Jiarong Li, Haijun Jiang, Shuzhen Yu, and Zhiyong Yu
- Subjects
Equilibrium point ,Lyapunov stability ,Computer science ,General Mathematics ,Applied Mathematics ,Stability (learning theory) ,General Physics and Astronomy ,Statistical and Nonlinear Physics ,Computer Science::Social and Information Networks ,Function (mathematics) ,Rumor ,Topology ,01 natural sciences ,010305 fluids & plasmas ,Linearization ,Stability theory ,0103 physical sciences ,010301 acoustics ,Heterogeneous network - Abstract
Considering the multilingual environment of rumors propagation, we propose a novel I2SR rumor propagation model with time delay on heterogeneous networks. Firstly, the basic reproduction number, depending on the network structure, is given to ensure the existence of the equilibrium points. Meanwhile, the dynamic behaviors of the rumor free equilibrium point (RFEP) are analyzed via the local linearization method and comparison principle. We also prove that the rumor equilibrium point (REP) is globally asymptotically stable (G-stable) by employing the Lyapunov stability theory and irreducible matrix properties and demonstrate the effect of time delay on the outbreak point and stability. Secondly, in order to reduce the cost of limited public resources, a new event-triggered impulsive control (ETIC) is applied to restrain the propagation of rumor. The event-triggering function is carefully designed and some criteria are obtained to guarantee that the rumor disappeared. Finally, we recognize the most sensitive parameter to the model and numerically simulate the model with some useful parameter sets to justify the theoretical results. Furthermore, using a rumor example of Sina Weibo in 2017, we find that our model can well fit the real rumor spreading process, and the ETIC can effectively inhibit the rumor propagation.
- Published
- 2021
34. Support Morphology-Dependent Catalytic Activity of Pd/CeO2 for Formaldehyde Oxidation
- Author
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Shuzhen Yu, Kebin Zhou, Jin Wang, and Hongyi Tan
- Subjects
Materials science ,Inorganic chemistry ,Formaldehyde ,Catalytic combustion ,General Chemistry ,Catalysis ,Metal ,chemistry.chemical_compound ,chemistry ,X-ray photoelectron spectroscopy ,Chemical engineering ,visual_art ,visual_art.visual_art_medium ,Environmental Chemistry ,Nanorod ,High-resolution transmission electron microscopy ,Space velocity - Abstract
To eliminate indoor formaldehyde (HCHO) pollution, Pd/CeO2 catalysts with different morphologies of ceria support were employed. The palladium nanoparticles loaded on {100}-faceted CeO2 nanocubes exhibited much higher activity than those loaded on {111}-faceted ceria nanooctahedrons and nanorods (enclosed by {100} and {111} facets). The HCHO could be fully converted into CO2 over the Pd/CeO2 nanocubes at a GHSV of 10 000 h–1 and a HCHO inlet concentration of 600 ppm at ambient temperature. The prepared catalysts were characterized by a series of techniques. The HRTEM, ICP-MS and XRD results confirmed the exposed facets of the ceria and the sizes (1–2 nm) of the palladium nanoparticles with loading amounts close to 1%. According to the Pd 3d XPS and H2-TPR results, the status of the Pd-species was dependent on the morphologies of the supports. The {100} facets of ceria could maintain the metallic Pd species rather than the {111} facets, which promoted HCHO catalytic combustion. The Raman and O 1s XPS resul...
- Published
- 2015
35. Morphological Effects of Gold Clusters on the Reactivity of Ceria Surface Oxygen
- Author
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Shuzhen Yu, Jin Wang, Hongyi Tan, and Kebin Zhou
- Subjects
Materials science ,Chemical engineering ,Bilayer ,Monolayer ,Inorganic chemistry ,Atom ,Nanoparticle ,Reactivity (chemistry) ,Density functional theory ,General Chemistry ,Catalysis ,Nanoclusters - Abstract
Well-defined {100}-faceted ceria nanocube-supported gold nanoclusters with various morphologies, including individual atom, monolayer, multilayer and nanoparticle, have been synthesized and systematically investigated combined with density functional theory calculations. A strong morphological effect of gold clusters on the reactivity of ceria surface oxygen has been identified. The reducibility and CO oxidation activities of Au/CeO2 catalysts increased significantly as the morphology of the gold clusters changed from single atoms to monolayer, then to multilayer, then nanoparticles. It was revealed that up to a bilayer of gold clusters were needed for desirable catalytic performance in the Au/CeO2 system. The transfer of electrons from gold clusters to the surface Ce–O groups of ceria and strong Au–Au interactions play significant roles in determining the reducibility of surface oxygen of CeO2.
- Published
- 2015
36. High Porosity Supermacroporous Polystyrene Materials with Excellent Oil–Water Separation and Gas Permeability Properties
- Author
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Kebin Zhou, Shuzhen Yu, Jin Wang, Hongyi Tan, and Xin Liu
- Subjects
geography ,geography.geographical_feature_category ,Materials science ,Pickering emulsion ,chemistry.chemical_compound ,chemistry ,Emulsion ,Amphiphile ,medicine ,General Materials Science ,Polystyrene ,Wetting ,Swelling ,medicine.symptom ,Monolith ,Composite material ,Porosity - Abstract
Two types of monolith high-porosity supermacroporous polystyrene materials had been controlled synthesized from water-in-oil Pickering emulsions. The first type, closed-cell high-porosity (up to 91%) supermacroporous (ca. 500 μm) polystyrene materials (CPPs) was prepared by employing amphiphilic carbonaceous microspheres (CMs) as high internal phase emulsion stabilizer without any inorganic salts or further modifying the wettability of the particles. The second type, hierarchical porous polystyrene materials with highly interconnected macropores (IPPs), was constructed from emulsions stabilized simultaneously by CM particles and a little amount of surfactants. Both types of these monolith porous polystyrene materials possessed excellent mechanical strength. The CPPs were used as absorbents for oil-water separation and high absorption capacity, and absorption rate for oils were realized, which was attributed to their porosity structure and the swelling property of the polystyrene, while the IPPs were highly permeable for gases due to their interconnected macropores.
- Published
- 2015
37. Hydrodeoxygenation of vanillin as a bio-oil model over carbonaceous microspheres-supported Pd catalysts in the aqueous phase and Pickering emulsions
- Author
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Jin Wang, Kebin Zhou, Shuzhen Yu, Zhibin Zhu, and Hongyi Tan
- Subjects
chemistry.chemical_compound ,chemistry ,Vanillin ,Emulsion ,Amphiphile ,Aqueous two-phase system ,Environmental Chemistry ,Organic chemistry ,Selectivity ,Pollution ,Hydrodeoxygenation ,Pickering emulsion ,Catalysis - Abstract
A series of amphiphilic carbonaceous microspheres-supported Pd catalysts have been prepared and their performances for the hydrodeoxygenation of vanillin have been investigated in both a pure aqueous phase and in water–oil biphasic systems. The wettability of the catalyst could be facilely tuned by adjusting the hydrothermal treatment temperature during the synthesis of the carbonaceous microspheres or by a post-treatment process in alkaline solution. In the aqueous phase reactions, the more hydrophilic the catalyst, the more active it was for the hydrodeoxygenation of vanillin. And the wettability of the support affects the activity through the interaction between the catalysts and substrates/products. In the case of a water–oil biphase, the wettability of the support played a key role in forming Pickering emulsions. It was found that the selectivity of the hydrodeoxygenation reactions was determined by the type of Pickering emulsion and high selectivity of p-creosol could be achieved in the water-in-oil emulsion systems.
- Published
- 2014
38. Effects of edaravone on the expression of β-defensin-2 mRNA in lung tissue of rats with myocardial ischemia reperfusion
- Author
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Shuzhen Yu, Jianmin Jin, Jianfeng Wei, Weiwei Zhang, and Yongqing Guo
- Subjects
Male ,Cancer Research ,medicine.medical_specialty ,Pathology ,beta-Defensins ,Blotting, Western ,Myocardial Reperfusion Injury ,Lung injury ,Biochemistry ,Permeability ,chemistry.chemical_compound ,Internal medicine ,Edaravone ,Genetics ,medicine ,Animals ,RNA, Messenger ,Rats, Wistar ,Creatine Kinase ,Lung ,Molecular Biology ,medicine.diagnostic_test ,biology ,Tumor Necrosis Factor-alpha ,business.industry ,respiratory system ,Rats ,Endocrinology ,Bronchoalveolar lavage ,medicine.anatomical_structure ,Gene Expression Regulation ,Oncology ,Mechanism of action ,chemistry ,Apoptosis ,biology.protein ,Molecular Medicine ,Tumor necrosis factor alpha ,Creatine kinase ,medicine.symptom ,business ,Antipyrine - Abstract
The aim of this study was to investigate the effects of edaravone on lung injury caused by myocardial ischemia reperfusion (I/R) in rats. Wistar rats (n=24) were randomly divided into 4 groups: the sham operation (S group) and myocardial I/R groups (C group) and two edaravone‑treated groups (E1 and E2 groups). Rats in the E1 and E2 groups were injected with 3 or 10 mg/kg edaravone, respectively, 1 min before reperfusion. The rats were sacrificed and the lung tissue, bronchoalveolar lavage (BAL) fluid and serum were obtained. The concentration of serum creatine kinase isoenzyme (CK-MB) was determined, the lung permeability index (PPI) was calculated and β-defensin-2 (BD-2) mRNA expression in the lung tissue and BD-2 and TNF-α protein content levels were determined. Serum CK-MB activity and the PPI were increased, while BD-2 mRNA and BD‑2 and TNF-α protein levels in the lung tissue were upregulated in the C, E1 and E2 groups compared with the S group. The above‑mentioned indicators were decreased in the E1 and E2 groups compared with the IR group. The level of the decrease for indicators in the E2 group was significantly different compared with that in the E1 group. In conclusion, edaravone reduced the lung injury caused by myocardial I/R in rats. Its mechanism of action was not only oxygen free radical scavenging, but was also associated with a suppression of the inflammatory response of the lung tissue.
- Published
- 2013
39. core–shell nanowires with different shapes: Synthesis and field emission properties
- Author
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X.G. Liu, Guoqing Miao, Hong Jiang, Hongwei Song, Shuzhen Yu, Lei Cao, Zheng-Cai Li, and Wei Guo
- Subjects
Materials science ,Morphology (linguistics) ,Scanning electron microscope ,Nanowire ,Nanotechnology ,General Chemistry ,Substrate (electronics) ,Condensed Matter Physics ,Methane ,Catalysis ,chemistry.chemical_compound ,Field electron emission ,chemistry ,Chemical engineering ,Transmission electron microscopy ,Materials Chemistry - Abstract
Three different shapes of SiC/SiO 2 core–shell nanowires were synthesized on Si substrates through a reaction between methane and silica using iron as catalyst. Analysis of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results indicated that catalyst morphology was the key factor for the formation of these three different products. The field emission properties of these three nanowires were investigated. Comparing the field emission results of these three nanowires, we can obtain a conclusion that a vertically well-aligned orientation to the substrate played a very significant role in improving the field emission properties when the emitters are up to a considerable number.
- Published
- 2010
40. Growth and optical properties of catalyst-free InP nanowires on Si (100) substrates
- Author
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Hang Song, Hong Jiang, Ligong Zhang, Xiaojuan Sun, Guoqing Miao, Shuzhen Yu, Yixin Jin, Zhiming Li, and Dabing Li
- Subjects
Photoluminescence ,Materials science ,business.industry ,Band gap ,Nanowire ,Chemical vapor deposition ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,symbols.namesake ,Optics ,symbols ,Optoelectronics ,Metalorganic vapour phase epitaxy ,Vapor–liquid–solid method ,business ,Electronic band structure ,Raman scattering - Abstract
Catalyst-free InP nanowires were grown on Si (1 0 0) substrates by metal-organic chemical vapor deposition. Morphology, crystal structure, photoluminescence, and Raman scattering properties of the nanowires were investigated. Most nanowires are long and straight; the angles between the nanowires and the Si substrate are diverse. The photoluminescence peak shows blue-shift from the band gap energy of bulk InP. Both the blue-shift of photoluminescence peak and the full width at half-maximum of photoluminescence spectrum increase with decreasing nanowires growth temperature. Due to laser-induced heating, the TO and LO phonon peaks of the nanowires reveal downshift and asymmetric broadening compared with those of bulk InP at room temperature.
- Published
- 2010
41. A study of two-step growth and properties of In0.82Ga0.18As on InP
- Author
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Hong Jiang, Tiemin Zhang, Zhiming Li, Guoqing Miao, Yixin Jin, Shuzhen Yu, and Hang Song
- Subjects
Diffraction ,Morphology (linguistics) ,Materials science ,Phonon ,Scanning electron microscope ,Mechanical Engineering ,Two step ,Analytical chemistry ,Frequency shift ,Condensed Matter Physics ,Stress (mechanics) ,Crystallography ,symbols.namesake ,Mechanics of Materials ,symbols ,General Materials Science ,Raman spectroscopy - Abstract
In 0.82 Ga 0.18 As was grown by LP-MOCVD on InP substrates with the two-step growth technique. It was analyzed that epilayer's growth temperature affected on the crystalline quality, surface morphology, carrier concentration, and mobility of the In 0.82 Ga 0.18 As, which was characterized by X-ray diffraction, scanning electron microscopy, and Hall measurements. The evaluation of stress in In 0.82 Ga 0.18 As was made from frequency shift of the GaAs-like LO phonon of the Raman spectrum.
- Published
- 2009
42. Hemiparetic Stroke Alters Vastus Lateralis Myosin Heavy Chain Profiles Between the Paretic and Nonparetic Muscles
- Author
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Charlene E. Hafer-Macko, Shuzhen Yu, Richard F. Macko, Steven J. Prior, and Michael J. McKenzie
- Subjects
Male ,medicine.medical_specialty ,Arbitrary unit ,Physical Therapy, Sports Therapy and Rehabilitation ,Major histocompatibility complex ,Article ,Quadriceps Muscle ,Paired samples ,Internal medicine ,MHC class I ,Myosin ,medicine ,Humans ,Orthopedics and Sports Medicine ,Stroke ,Aged ,Paresis ,Aged, 80 and over ,Myosin Heavy Chains ,biology ,business.industry ,Skeletal muscle ,Anatomy ,Middle Aged ,medicine.disease ,Phenotype ,Endocrinology ,medicine.anatomical_structure ,biology.protein ,Female ,medicine.symptom ,business - Abstract
Skeletal muscle phenotype alterations following hemiparetic stroke contribute to disabilities associated with stroke. The phenotypic response following stroke is undefined. This investigation examined the myosin heavy chain (MHC) composition of the vastus lateralis (VL) of stroke survivors in paretic (P) and nonparetic (NP) muscle. Protein obtained from VL of 10 stroke survivors was isolated and purified, and MHC gel electrophoresis was performed. The MHC bands were quantified, and a paired sample two-tailed T test with significance set at p < or = 0.05 was performed. MHC I expression was significantly less in P versus NP VL (.93 vs. 1.00 arbitrary units [AU]). Significantly more IIx MHC was found in the P versus NP VL (1.33 vs. 1.0). No significant differences in type IIa MHC (1.07 P vs. 1.00 NP) were found. These changes in MHC composition suggest an alteration in muscle function due to stroke or the altered activity patterns of muscle following stroke.
- Published
- 2009
43. Effect of buffer thickness on properties of In0.8Ga0.2As/InP with two-step growth technique
- Author
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Hong Jiang, Guoqing Miao, Tiemin Zhang, Yixin Jin, Shuzhen Yu, Hang Song, and Zhiming Li
- Subjects
Electron mobility ,Chemistry ,Scanning electron microscope ,Mechanical Engineering ,Metals and Alloys ,Analytical chemistry ,Substrate (electronics) ,Chemical vapor deposition ,Surface coating ,symbols.namesake ,Mechanics of Materials ,Materials Chemistry ,symbols ,Metalorganic vapour phase epitaxy ,Raman spectroscopy ,Raman scattering - Abstract
In 0.8 Ga 0.2 As was grown by low-pressure metalorganic chemical vapor deposition (LP-MOCVD) on InP(1 0 0) substrate with two-step growth technique. Effect of buffer thickness on crystalline quality, surface morphology, electrical property and stress of In 0.8 Ga 0.2 As epilayer was analyzed, and properties of the In 0.8 Ga 0.2 As epilayer were characterized by X-ray diffraction, scanning electron microscopy, Hall measurements and Raman scattering. The experiments showed that the properties of the In 0.8 Ga 0.2 As epilayer had close relation to the buffer thickness and the optimum buffer thickness was about 100 nm.
- Published
- 2009
44. Human genome comparison of paretic and nonparetic vastus lateralis muscle in patients with hemiparetic stroke
- Author
-
Charlene E. Hafer-Macko, Shuzhen Yu, Richard F. Macko, Michael J. McKenzie, and John C. McLenithan
- Subjects
Male ,medicine.medical_specialty ,Weakness ,Transcription, Genetic ,Vastus lateralis muscle ,Gene Expression ,Article ,Atrophy ,Internal medicine ,Myosin ,medicine ,Humans ,Spasticity ,Muscle, Skeletal ,Stroke ,Aged ,Aged, 80 and over ,Inflammation ,business.industry ,Cell Cycle ,Rehabilitation ,Stroke Rehabilitation ,Skeletal muscle ,Middle Aged ,Microarray Analysis ,medicine.disease ,Paresis ,medicine.anatomical_structure ,Endocrinology ,Lower Extremity ,Chronic Disease ,Physical therapy ,RNA ,Female ,medicine.symptom ,business ,Anaerobic exercise ,Muscle Contraction ,Signal Transduction - Abstract
Hemiparetic stroke leads to major skeletal muscle abnormalities, as illustrated by paretic leg atrophy, weakness, and spasticity. Furthermore, the hemiparetic limb muscle shifts to a fast-twitch muscle fiber phenotype with anaerobic metabolism. This study investigated whether skeletal muscle genes were altered in chronic hemiparetic stroke. The nonparetic leg muscle served as an internal control. We used Affymetrix microarray analysis to survey gene expression differences between paretic and nonparetic vastus lateralis muscle punch biopsies from 10 subjects with chronic hemiparetic stroke. Stroke latency was greater than 6 months. We found that 116 genes were significantly altered between the paretic and non paretic vastus lateralis muscles. These gene differences were consistent with reported differences after stroke in areas such as injury and inflammation markers, the myosin heavy chain profile, and high prevalence of impaired glucose tolerance and type 2 diabetes. Furthermore, while many other families of genes were altered, the gene families with the most genes altered included inflammation, cell cycle regulation, signal transduction, metabolism, and muscle contractile protein genes. This study is an early step toward identification of specific gene regulatory pathways that might lead to these differences, propagate disability, and increase vascular disease risk.
- Published
- 2008
45. Effect of buffer layer thickness and epilayer growth temperature on crystalline quality of InAs0.9Sb0.1 grown by MOCVD
- Author
-
Yixin Jin, Jianchun Xie, Tiemin Zhang, Hong Jiang, Shuzhen Yu, Hang Song, Guoqing Miao, and Zhiming Li
- Subjects
Materials science ,Scanning electron microscope ,Mechanical Engineering ,Metals and Alloys ,Chemical vapor deposition ,Layer thickness ,Buffer (optical fiber) ,Metal ,Crystallography ,Compressive strength ,Quality (physics) ,Mechanics of Materials ,visual_art ,Materials Chemistry ,visual_art.visual_art_medium ,Metalorganic vapour phase epitaxy ,Composite material - Abstract
InAs 0.9 Sb 0.1 epilayers are grown on GaAs (001) substrates by metal organic chemical vapor deposition (MOCVD). In order to relax compressive strain caused by lattice mismatch between InAs 0.9 Sb 0.1 and GaAs, we employ a two-step growth method in which low temperature (430 °C) InAs 0.9 Sb 0.1 buffer layers with different thicknesses are introduced into the structure. Effect of the buffer layer thickness and the epilayer's growth temperature on crystalline quality of the epilayer is investigated, respectively. It is clear that there are strip pyramids paralleling with each other on most surface of the samples. The crystalline quality gets well obviously when the buffer layer thickness change from 0 to 50 nm, but it gets worse when the buffer layer thickness increases to 100 nm. It is also shown that the crystalline quality of the epilayer is improved obviously when the epilayer is grown at 500 °C, and it gets worse when the growth temperature decreases or increases.
- Published
- 2008
46. Comparison of risk assessments for venous thromboembolism during the puerperium
- Author
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Xianggui Luo, Weishe Zhang, Renhui Zhou, Xiangning Tu, Qiaohong Guo, Shuzhen Yuan, Yanhua Zhao, Chenlin Pei, Xinhua Wu, Jiahao Zhu, Yi Huang, Jingrui Huang, and Qi Li
- Subjects
Venous thromboembolism ,Puerperium ,Risk factors ,Risk assessment ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Objective: To compare the predictive value of different risk assessment methods for puerperium venous thromboembolism (VTE). Methods: This study included 55 women with and 165 women without puerperal VTE. Using the cases, 11 assessment methods were compared. Results: The area under the curve (AUC) value of the 11 assessments was highest for the modified Caprini risk assessment model for pregnancy (a modified risk scoring method from Caprini, AUC = 0.805). Pairwise comparison of the AUC values of the 11 assessment methods indicated no significant difference among the five methods with AUC values > 0.7. Among them, the modified Caprini, the risk scoring method recommended by the Swedish Guidelines (Swedish method), and the risk scoring method recommended by the Shanghai consensus (Shanghai method) performed better than the other six methods with AUC values
- Published
- 2023
- Full Text
- View/download PDF
47. Support Morphology-Dependent Catalytic Activity of Pd/CeO₂ for Formaldehyde Oxidation
- Author
-
Hongyi, Tan, Jin, Wang, Shuzhen, Yu, and Kebin, Zhou
- Subjects
Oxygen ,Nanotubes ,Microscopy, Electron, Transmission ,X-Ray Diffraction ,Air Pollution, Indoor ,Formaldehyde ,Nanoparticles ,Cerium ,Carbon Dioxide ,Oxidation-Reduction ,Catalysis ,Palladium - Abstract
To eliminate indoor formaldehyde (HCHO) pollution, Pd/CeO2 catalysts with different morphologies of ceria support were employed. The palladium nanoparticles loaded on {100}-faceted CeO2 nanocubes exhibited much higher activity than those loaded on {111}-faceted ceria nanooctahedrons and nanorods (enclosed by {100} and {111} facets). The HCHO could be fully converted into CO2 over the Pd/CeO2 nanocubes at a GHSV of 10,000 h(-1) and a HCHO inlet concentration of 600 ppm at ambient temperature. The prepared catalysts were characterized by a series of techniques. The HRTEM, ICP-MS and XRD results confirmed the exposed facets of the ceria and the sizes (1-2 nm) of the palladium nanoparticles with loading amounts close to 1%. According to the Pd 3d XPS and H2-TPR results, the status of the Pd-species was dependent on the morphologies of the supports. The {100} facets of ceria could maintain the metallic Pd species rather than the {111} facets, which promoted HCHO catalytic combustion. The Raman and O 1s XPS results revealed that the nanorods with more defect sites and oxygen vacancies were responsible for the easy oxidation of the Pd-species and low catalytic activity.
- Published
- 2015
48. Investigation on growth related aspects of catalyst-free InP nanowires grown by metal organic chemical vapor deposition
- Author
-
Hang Song, Xiaojuan Sun, Zhiming Li, Yixin Jin, Dabing Li, Hong Jiang, Guoqing Miao, Tiemin Zhang, and Shuzhen Yu
- Subjects
Nanostructure ,Materials science ,Scanning electron microscope ,Mechanical Engineering ,Metals and Alloys ,Nanowire ,Nanotechnology ,Chemical vapor deposition ,Epitaxy ,Chemical engineering ,Mechanics of Materials ,Materials Chemistry ,Deposition (phase transition) ,Metalorganic vapour phase epitaxy ,Vapor–liquid–solid method - Abstract
Catalyst-free InP nanowires were grown on Si (1 0 0) substrates by metal organic chemical vapor deposition. In this method, in situ deposited In droplets are seeds of the InP nanowires growth. In order to control the growth of epitaxial InP nanowires, a detailed investigation on the growth related aspects such as the In droplets deposition time, growth temperature, and V/III ratio has been made. The experimental results indicate that the diameter, shape, and length of the nanowires can be controlled by growth conditions.
- Published
- 2009
49. Endogenous microRNA triggered enzyme-free DNA logic self-assembly for amplified bioimaging and enhanced gene therapy via in situ generation of siRNAs
- Author
-
Qinghua Jiang, Shuzhen Yue, Kaixin Yu, Tian Tian, Jian Zhang, Huijun Chu, Zhumei Cui, and Sai Bi
- Subjects
DNA nanotechnology ,miRNA ,siRNA ,Gene therapy ,Cervical carcinoma ,Biotechnology ,TP248.13-248.65 ,Medical technology ,R855-855.5 - Abstract
Abstract Background Small interfering RNA (siRNA) has emerged as a kind of promising therapeutic agents for cancer therapy. However, the off-target effect and degradation are the main challenges for siRNAs delivery. Herein, an enzyme-free DNA amplification strategy initiated by a specific endogenous microRNA has been developed for in situ generation of siRNAs with enhanced gene therapy effect on cervical carcinoma. Methods This strategy contains three DNA hairpins (H1, H2/PS and H3) which can be triggered by microRNA-21 (miR-21) for self-assembly of DNA nanowheels (DNWs). Notably, this system is consistent with the operation of a DNA logic circuitry containing cascaded “AND” gates with feedback mechanism. Accordingly, a versatile biosensing and bioimaging platform is fabricated for sensitive and specific analysis of miR-21 in HeLa cells via fluorescence resonance energy transfer (FRET). Meanwhile, since the vascular endothelial growth factor (VEGF) antisense and sense sequences are encoded in hairpin reactants, the performance of this DNA circuit leads to in situ assembly of VEGF siRNAs in DNWs, which can be specifically recognized and cleaved by Dicer for gene therapy of cervical carcinoma. Results The proposed isothermal amplification approach exhibits high sensitivity for miR-21 with a detection limit of 0.25 pM and indicates excellent specificity to discriminate target miR-21 from the single-base mismatched sequence. Furthermore, this strategy achieves accurate and sensitive imaging analysis of the expression and distribution of miR-21 in different living cells. To note, compared to naked siRNAs alone, in situ siRNA generation shows a significantly enhanced gene silencing and anti-tumor effect due to the high reaction efficiency of DNA circuit and improved delivery stability of siRNAs. Conclusions The endogenous miRNA-activated DNA circuit provides an exciting opportunity to construct a general nanoplatform for precise cancer diagnosis and efficient gene therapy, which has an important significance in clinical translation. Graphic abstract
- Published
- 2021
- Full Text
- View/download PDF
50. MicroRNA Transcriptomes Relate Intermuscular Adipose Tissue to Metabolic Risk
- Author
-
Xuewei Li, Lin Bai, Jideng Ma, Mingzhou Li, Fengjiao Wang, Lei Chen, Jinyong Wang, Yanzhi Jiang, Jian Xiao, Anan Jiang, and Shuzhen Yu
- Subjects
pig ,obesity ,medicine.medical_specialty ,Sus scrofa ,Subcutaneous Fat ,Adipose tissue ,Inflammation ,Biology ,Article ,immune response ,Catalysis ,lcsh:Chemistry ,Inorganic Chemistry ,Transcriptome ,Immune system ,Risk Factors ,Internal medicine ,microRNA ,Diabetes Mellitus ,medicine ,Animals ,Humans ,inflammation response ,Physical and Theoretical Chemistry ,Muscle, Skeletal ,lcsh:QH301-705.5 ,Molecular Biology ,Spectroscopy ,miRNA ,Sequence Analysis, RNA ,Organic Chemistry ,Metabolic risk ,General Medicine ,intermuscular adipose tissue (IMAT) ,metabolic risk ,transcriptome ,Computer Science Applications ,Disease Models, Animal ,MicroRNAs ,Endocrinology ,Adipose Tissue ,lcsh:Biology (General) ,lcsh:QD1-999 ,Adipogenesis ,Female ,Subcutaneous adipose tissue ,medicine.symptom - Abstract
Intermuscular adipose tissue is located between the muscle fiber bundles in skeletal muscles, and has similar metabolic features to visceral adipose tissue, which has been found to be related to a number of obesity-related diseases. Although various miRNAs are known to play crucial roles in adipose deposition and adipogenesis, the microRNA transcriptome of intermuscular adipose tissue has not, until now, been studied. Here, we sequenced the miRNA transcriptomes of porcine intermuscular adipose tissue by small RNA-sequencing and compared it to a representative subcutaneous adipose tissue. We found that the inflammation- and diabetes-related miRNAs were significantly enriched in the intermuscular rather than in the subcutaneous adipose tissue. A functional enrichment analysis of the genes predicted to be targeted by the enriched miRNAs also indicated that intermuscular adipose tissue was associated mainly with immune and inflammation responses. Our results suggest that the intermuscular adipose tissue should be recognized as a potential metabolic risk factor of obesity.
- Published
- 2013
- Full Text
- View/download PDF
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