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Effects of channel blocks on the spiking regularity in clustered neuronal networks

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Science China(Technological Sciences) 2014年第5期57卷 879-884页

作者： SUN xiaoJuan shi xia School of Science Beijing University of Posts and Telecommunications

In this paper,we discuss the influences of channel blocks on the spiking regularity in a clustered neuronal network by applying stochastic Hodgkin-Huxley neuronal models as the building *** the aid of simulation results,we reveal that the spiking regularity of the clustered neuronal network could be resonantly enhanced via fine-tuning of the non-blocked potassium channel fraction *** the non-blocked sodium channel fraction xNa can enhance the spiking regularity of the clustered neuronal network in most *** results indicate that not only sodium channel blocks but also potassium channel blocks could have great influences on the regularity of spike timings in the clustered neuronal *** the importance of spike timings in neuronal information transforming processes,our results may give some implications for understanding the nonnegligible role of randomness in ion channels in neuronal systems.

关键词： channel blocks spiking regularity clustered neuronal networks

Periodic Solutions of Nonautonomous Second Order Hamiltonian Systems

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Acta Mathematica Sinica,English Series 2005年第4期21卷 685-690页

作者： shi xia LUAN An Min MAO Department of Mathematics Qufu Normal University Qufu 273165. P. R. China Institute of Mathematics Academy of Mathematics and Systems Science Chinese Academy of Sciences. Beijing 100080. P. R. China

In this paper, we develop the local linking theorem given by Li and Willein by replacing the Palais-Smale condition with a Cerami one, and apply it to the study of the existence of periodic solutions of the nonautonomous second order Hamiltonian systems （H） ü＋A（t）u＋∨V（t, u）=0, u∈R^N, t∈R. We handle the case of superquadratic nonlinearities which differ from those used previously. Our results extend the theorems given by Li and Willem.

关键词： Non-autonomous Hamiltonian systems Periodic solutions Local linking Critical point theory Variational method

Fe-Mo-B Enhanced Sintering of P/M 316L Stainless Steel

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Journal of Iron and Steel Research International 2008年第1期15卷 10-14页

作者： YANG xia GUO shi-ju Institute of Powder Metallurgy University of Science and Technology Beijing Beijing 100083 China

Liquid-phase enhanced sintering of powder metallurgy（P/M）316L stainless steel by addition of sintering aids was studied.2%-8% of pre-alloyed Fe-Mo-B powder with two different particle sizes was added as sintering aids,and the specimens were sintered in vacuum at 1 200-1 350 ℃.The results show that the fine Fe-Mo-B powder（5-10 μm）has stronger activated *** sintered density increases with the increase in sintering aid content or sintering *** compaction has a better effect on the control of dimensional precision of *** prealloyed Fe-Mo-B powder deviated from Mo2FeB2 component can also be sintering aid of P/M 316L stainless steel.

关键词： P/M 316L stainless steel liquid-phase sintering activated sintering Fe-Mo-B sintering aid

Survival Probability of Population-size-dependent Branching Processes in Random Environments

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Acta Mathematicae Applicatae Sinica 2016年第2期32卷 477-484页

作者： shi-xia MA xiao-yu XING School of Sciences Hebei University of Technology

The class of population-size-dependent branching processes in independent identically distributed random environments is investigated. Under the critical case and appropriate moment assumption, we establish an asympto... 详细信息

关键词： branching processes population-size-dependent processes random environments survival proba-bility

Relationship between Levels of Testosterone and Cortisol in Saliva and Aggressive Behaviors of Adolescents

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Biomedical and Environmental Sciences 2009年第1期22卷 44-49页

作者： YI-ZHEN YU AND JUN-xia shi Department of Child and Adolescent Health and Maternal Care School of Public Health Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 Hubei China xiamen Maternity and Child Hospital Xiamen 361003 Fujian China

Objective To explore the endocfinal factors which influence the aggressive behavior of adolescents. Methods The levels of cortisol （CORT）, testosterone （T）, prolactin （PRL）, and growth hormone （GH） in saliva from 20 aggressive students and 20 non-aggressive control students were measured by radioimmunoassay （RIA）. The students were matched for their gender, age, grade, stage of pubertal development, and economic status of their families. Results The salivary T levels were 22.20±14.50 pg/mL and 19.54±12.52 pg/mL in aggressive male and female students, 13.20±6.85 pg/mL and 5.24±3.03 pg/mL in non-aggressive male and female students （P〈0.05）. The male aggressive students had a lower level of CORT in saliva than non-aggressive male students （P〈0.05）. There were no significant differences in the salivary levels of PRL or GH between the aggressive and non-aggressive groups. Correlation analysis revealed a negative relationship in male students between the salivary CORT levels and the aggression factor scores of the child behavior checklist （CBCL）. In addition, the data also showed a positive relationship between the salivary T levels and the aggression factor scores of CBCL in female students. Multiple linear regression analysis showed that the salivary CORT level was an independent predictive factor for aggressive behaviors in adolescent boys. The higher the CORT level, the less aggressive the boys were. Conclusion CORT and T levels may play a certain role in adolescent aggressive behaviors.

关键词： Adolescents Aggressive behavior Testosterone (T) Cortisol (CORT)

Synthesis and Acid-Catalyzed Cyclization of 2-Alkenylstilbenes： a New Approach to the Substituted Indenes

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Chinese Journal of Chemistry 2015年第11期33卷 1276-1286页

作者： Wei Ding xiaoxin shi xia Lu Department of Pharmaceutical Engineering School of Pharmacy East China University of Science and Technology Shanghai 200237 China

A base-catalyzed ring-opening of 1-benzylisochromans 1 firstly produced 2-alkenylstilbenes 2, which then underwent a mild acid-catalyzed intramolecular cyclization to furnish 1,2-disubstituted indenes 3 in high yields. Subsequently, a base-catalyzed isomerization of the 1,2-disubstituted indenes 3 afforded the more stable 2,3-disubstituted indenes 4 in almost quantitative yields.

关键词： isochroman stilbene indene cyclization ring-opening synthetic methodology

Bisexual Galton-Watson Branching Processes in Random Environments

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Acta Mathematicae Applicatae Sinica 2006年第3期22卷 419-428页

作者： shi-xia Ma School of Mathematical Sciences Nankai University Tianjin 300071 China

In this paper, we consider a bisexual Galton-Watson branching process whose offspring probability distribution is controlled by a random environment proccss. Some results for the probability generating functions associated with the process are obtained and sufficient conditions for certain extinction and for non-certain extinction are established.

关键词： Bisexual Galton-Watson branching processes branching processes in random environments,extinction probabilities

Stepping into the Public World： Cases of Guixiu Philanthropic Activities in Late Qing China

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Frontiers of History in China 2014年第2期9卷 247-279页

作者： xia shi Divisionof Social Sciences New College of Florida Sarasota FL 34243-2197 USA

This article explores the of certain elite women during late little-known public philanthropic activities Qing China. By examining contemporary newspapers, it traces the new development of women＇s philanthropic engagement and further analyzes two cases, one on disaster relief and the other on women＇s education, to illustrate the issues, controversies and achievements that went along with women＇s philanthropy. It demonstrates how philanthropy, a traditionally-sanctioned field for women＇s activism, legitimatized women to move out of domestic seclusion and reposition themselves in the public sphere in a crucial transitional era when for ＂good women＂ to appear in public was something hotly debated, and how through philanthropic opportunities some were able to engage with political affairs. The broad social impact of their initiatives suggests the continued importance of traditional elite women during China＇s transition to the modern era; it challenges some of our previous notions, which often unthinkingly accepted the verdict of ＂New Women＂ that those who did not embrace their path to modernity were parasitic, unproductive, and backward. By looking carefully at philanthropy, the article reveals fascinating issues and rich details of women＇s public activities that previous historical narratives have often overlooked. It helps to understand how reconfigured traditions became essential components of modernity in the development of modern Chinese gender roles. It also adds a gender perspective to the burgeoning historiography on Chinese philanthropy.

关键词： elite women philanthropy late Qing public tradition

L_p approximation by Bernstein-Kantorovich quasi-interpolants

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Applied Mathematics(A Journal of Chinese Universities) 2009年第2期24卷 200-208页

作者： LIU Li-xia shi Ling GUO Shun-sheng College of Math. and Inform. Sci. Hebei Normal Univ. Shijiazhuang 050016 China

Bernstein-Kantorovich quasi-interpolants K^（2r-1）n（f, x） are considered and direct, inverse and equivalence theorems with Ditzian-Totik modulus of smoothness ω^2rφ（f, t）p （1 ≤ p ≤＋∞） are obtained.

关键词： quasi-interpolant Bernstein-Kantorovich operator Ditzian-Totik modulus