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Dietary modulation of omasal epithelium development in weanling goats

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Dietary modulation of omasal epithelium development in weanl...

中国生理学会2007年消化内分泌生殖学术研讨会

作者： z.shen~* and Q.zhen (College of Animal Medicine,Nanjing Agricultural University,China)

＜正＞Background:The omasum,positioned between reticulo-rumen and abomasum,is the third part of the complex four-stomach of *** is now recognized that the reticulo-rumen and omasum are important organs for absorption ...

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Microglia regulate RVLM-projecting PVN neuronal activity

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Microglia regulate RVLM-projecting PVN neuronal activity

2019年中国生理学会心血管生理学术研讨会

作者： Qianqian Bi Bo Wei Chao Wang Yan Gu Xiao z.shen Peng Shi zhejiang University School of Medicine The Second Affiliated Hospital

＜正＞Microglia,the primary immune cells in the CNS,are critical in the maintenance of brain homeostasis such as participating neurogenesis and pruning *** previous work indicates that microglia are activated in hypertension;depletion of microglia in different activation status have opposite effects on blood pressure

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MPTP-induced impairment of cardiovascular function and autonomic neurons in the brain stem

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MPTP-induced impairment of cardiovascular function and auton...

2019年浙江省神经病学学术大会

作者： Xiaoli Liu Bo Wei Qianqian Bi Li Li Jian He Yuancheng Weng shenyan zhang Genxiang Mao Xiao z.shen Jing Yan Peng Shi The Second Affiliated Hospital Zhejiang Chinese Medical University Department of Neurology Zhejiang Hospital Department of Cardiology of the Second Affiliated Hospital and Institute of Translational MedicineZhejiang University School of Medicine Department of Physiology and Department of Cardiology of the Second Affiliated HospitalZhejiang University School of Medicine BGI Genomics zhejiang Provincial Key Lab of Geriatrics Zhejiang Hospital Department of Intensive Care Unit Zhejiang Hospital

Parkinson’s Disease(PD) is characterized by the loss of dopaminergic neurons in the substantia nigra pars compacta(SNpC).Besides motor disorders,PD patients usually have non-motor symptoms related to autonomic ***(1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine) is widely used to generate murine model of PD,Here,we examined the effects of MPTP on catecholaminergic neurons and autonomic function in *** 10 mg/kg/day of MPTP(4 consecutive days),we found that in addition to the loss of tyrosine hydroxylase(TH)+neurons in SNpC,MPTP treatment also induced loss of TH+ neurons in both rostroventrolateral medulla(RVLM) and nucleus tract solitaire(NTS) of the brain *** is associated with a significant decrease of dopamine,norepinephrine and epinephrine in the basal ganglia,cortex,brain stem and blood,as measured by liquid chromatography-mass spectrometry(LCMS) two and seven days post ***,there is a transient but significant reduction of systolic arterial pressure during the MPTP *** the blood pressure would restore to normal level after the cease of MPTP,there was a lasting effect of baroreflex desensitization and alteration of time-domain of heart rate variability in MPTP-treated ***,our results indicate that the loss of TH+neurons in hindbrain by MPTP treatment led to impaired autonomic cardiovascular *** of data collected from MPTP murine PD model should consider the accompanied autonomic dysfunction.

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创新是移动业务普及的推动要素

网络电信 2006年第12期8卷 17-20页

作者： G．Baker T．Kama G．Marciano z.shen

移动运营商在高速增长的市场中的关键挑战和机遇是如何服务当前没有享受或正在享受服务的用户，并从中获取收益。

关键词：移动业务创新移动运营商商业模型服务市场收益

A FAMILY OF DIFFERENCE SCHEMES WITH FOURNEAR-CONSERVED QUANTITIES FOR THE KdV EQUATION

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Journal of Computational Mathematics 1998年第2期16卷 129-140页

作者： Han, z.shen, LJ No Jiaotong Univ Dept Comp Sci & Technol Beijing 100044 Peoples R China Inst Appl Phys & Computat Math Beijing 100088 Peoples R China

We construct and analyze a family of semi-discretized difference schemes with two parameters for the Korteweg-de Vries (KdV) equation. The scheme possesses the first four near-conserved quantities for periodic boundary conditions. The existence and the convergence of its global solution in Sobolev space L-infinity(0,T;H-3) are proved and the scheme is also stable about initial values. Furthermore, the scheme conserves exactly the first two conserved quantities in the special case.

关键词： convergence difference scheme KdV equation conserved quantity

Transient Characteristics and Accommodative Current Limiting Strategy for Bidirectional Interlinking Converters in Hybrid AC/DC Microgrids

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1575-1588页

作者： Xia shen zhikang Shuai Wen Huang Chao shen Yang shen z.John shen College of Electrical and Information Engineering Hunan UniversityChangsha 410082China Department of Electrical and Computer Engineering Illinois Institute of TechnologyChicagoIL 60616 USA

Bidirectional interlinking converter(BIC)is the core equipment in a hybrid AC/DC microgrid connected between AC and DC ***,the variety of control modes and flexible bidirectional power flow complicate the influence of AC faults on BIC itself and on DC sub-grid,which potentially threaten both converter safety and system *** study first investigates AC fault influence on the BIC and DC bus voltage under different BIC control modes and different pre-fault operation states,by developing a mathematical model and equivalent sequence ***,based on the analysis results,a general accommodative current limiting strategy is proposed for BIC without limitations to specific mode or operation *** amplitude is predicted and constrained according to the critical requirements to protect the BIC and relieving the AC fault influence on the DC bus *** with conventional methods,potential current limit failure and distortions under asymmetric faults can also be ***,experiments verify feasibility of the proposed method.

关键词： Bidirectional interlinking converter current limiting fault characteristic hybrid AC/DC microgrid variation/oscillation of DC bus voltage

Surface Wettability and Chemistry of Ozone Perfusion Processed Porous Collagen Scaffold

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Journal of Bionic Engineering 2011年第3期8卷 223-233页

作者： Chaozong Liu Shirley z. shen 乙hiwu Han School of Mechanical and Systems Engineering University of Newcastle Newcastle upon Tyne NEI 7R U UK Polymer Composite & Nanomaterials CSIRO Manufacturing & Infrastructure Technology Highett Vic 3190 Australia Key Laboratory of Bionic Engineering (Ministry of Education China) Jilin University Changchun 130022 P. R. China

Crosslinking treatment of collagen has often been used to improve the biological stability and mechanical properties of 3D porous collagen scaffolds. However, accompanying these improvements, the collagen fibril surface becomes hydrophobic nature resulting in a reduced surface wettability. The wetting of the collagen fibril by culture medium is reduced and it is difficult for the medium to diffuse into the 3D structure of a porous collagen scaffold. This paper reports a ＂perfusion processing＂ strategy using ozone to improve the surface wettability of chemical crosslinked collagen scaffolds. Surface wettability, surface composition and biological stability were analyzed to evaluate the effectiveness of this surface processing strategy. It was observed that ozone perfusion processing improved surface wettability for both exterior and interior surfaces of the porous 3D collagen scaffold. The improvement in wettability is attributed to the incorporation of oxygen-containing functional groups onto the surface of the collagen fibrils, as confirmed by X-ray Photoelectron Spectroscopy （XPS） analysis. This leads to a significant improvement in water taking capability without compromising the bulk biological stability and mechanical properties, and confirms that ozone perfusion processing is an effective tool to modify the wettability both for interior and exterior surfaces throughout the scaffold.

关键词： scaffold collagen surface modification hydrophilicity ozone perfusion

Stability Investigation and Improvement for DC Cascade Systems with Simplified Impedance-based Stability Criterion

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1044-1052页

作者： Junbin Fang zhikang Shuai Yang Li zhibing Wang Xiangyang Wu Xia shen z.John shen College of Electrical and Information Engineering Hunan UniversityChangsha 410082China Renewable Energy Department of China Electric Power Research Institute Beijing 100192China Department of Electrical and Computer Engineering Illinois Institute of TechnologyChicagoIL 60616USA IEEE

In DC distributed power systems(DPSs),the complex impedance interactions possibly lead to DC bus voltage oscillation or *** previous research,the stability analysis of DPSs is implemented based on mathematical analysis in control *** specific mechanisms of the instability of the cascade system have not been intuitively *** this paper,the stability analysis of DPSs based on the traditional Nyquist criterion is simplified to the resonance analysis of the seriesconnected port impedance(z=R+jX)of source and load *** reveals that the essential reason for impedance instability of a DC cascade system is that the negative damping characteristic(Rzero-crossing *** simplified stability criterion for DC cascade systems can be concluded as:in the negative damping frequency ranges(Rzero-crossing point of the reactance component(i.e.,X=0).According to the proposed stability criterion,the oscillation modes of cascade systems are classified.A typical one is the internal impedance instability excited by the negative damping,and the other one is that the external disturbance amplified by negativity in a low stability ***,the impedance reshaping method for stability improvement of the system can be further *** validity of the simplified criterion is verified theoretically and experimentally by a positive damping reshaping method.

关键词： DC cascaded system,impedance model impedance reconstruction stability criterion

OXIDATION BEHAVIOR OF KOVAR ALLOY IN CONTROLLED ATMOSPHERE

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Acta Metallurgica Sinica(English Letters) 2008年第6期21卷 409-418页

作者： D. W. Luo z.S. shen School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Controlled oxidation experiments were performed on Kovar alloy by changing oxidation atmosphere, temperature, and exposure time to produce films with different oxide type and thickness. The results indicated that single Fe3O4 and single FeO were respectively obtained when Kovar alloy was oxidized in N2-2.31%H2O-0.95%H2 at 500℃ and in N2-2.31%H2O-0.5%H2 at 1000℃, and all kinetic curves followed linear relation; mixed oxides of FeO and Fe3O4 formed when Kovar was oxidized in N2-2.31%H2O at 1000℃and parabolic kinetics were obeyed. Analysis of metallographic cross section of oxides indicated that oxygen diffusion inward through the oxide scale is responsible for intergranular oxide, which had formed beneath the oxide scales when the oxide products were mixed oxides of FeO and Fe3O4, and which did not occur when the oxide was single FeO or Fe3O4. The oxidation model was also established.

关键词： Kovar alloy, Oxidation Controlled atmosphere H2-H2O-N2