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Search Results: 1 - 10 of 48574 matches for " Xu Hou "
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Reconfigure ZigBee Network Based on System Design  [PDF]
Yuan XU, Shubo QIU, Meng HOU
Wireless Sensor Network (WSN) , 2009, DOI: 10.4236/wsn.2009.13027
Abstract: This article analyses key technology used by network layer based on ZigBee technology. Then a reconfigure network as well as its strategy of forming network and distributing node is given. The simulation proved that the stability of reconfigure network and the ability of transmitting pass through obstacle are better than tradi-tional network; it has an active significance for shorter delay because of the flexible of the improved forming network strategy.
The Research on Stability of DC/DC in Parallel System  [PDF]
Ye Xu, Pengfei Hou, Jinquan Wang, Lei Xu, Chaohong Shi
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B154
Abstract:

In this paper, a main structure of DC distributed power system is introduced; the stability of the output voltage in parallel system is put forward. This paper analyses the output impedance of master-slave current sharing mode and average current sharing, analyses the stability of parallel system through simulation, there is Right-half plane (RHP) polar in the Bode plot of input impedance. At last this paper distinguishes whether this system is stability and verifies the validity of the simulation.

Synthesis dynamic and developmental profile of prothoracicotropic hormone between diapause- and nondiapause-destined individuals in Helicoverpa armigera
ChengLin Hou,WeiHua Xu
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-0310-1
Abstract: Biosynthesis and secretion of prothoracicotropic hormone (PTTH) of diapause- and nondiapause-destined individuals in Helicoverpa armigera were studied using whole-mount immunocytochemistry and enzyme-linked immunosorbent assay (ELISA). The immunocytochemistry revealed that PTTH is expressed in two pairs of lateral neurosecretory cells of the brain. The presence of immunoreactivity has not significant difference between the brains of the diapause- and nondiapause-destined 6th instar larvae. However, the obvious differences of expressional pattern from day 4 pupae were observed between the two types. PTTH titers in hemolymph from the 6th instar larvae to pharate adults were measured by the ELISA. Although there were similar titer changes between the two types of individuals at the larval stage, a significant difference from developmental expression was detected at the pupal stage, suggesting that the expression and secretion of PTTH does play a crucial role in regulation of pupal diapause of H. armigera.
Effect of Zhenju Jiangya Tablet on the endothelial function of hyperlipidemic rabbits
HOU Xu-Min
Zhong Xi Yi Jie He Xue Bao , 2004,
Abstract: Objective: To study the effect of Zhenju Jiangya Tablet (ZJ) on the injured endothelial cells and endothelium-dependent relaxation function of hyperlipidemia rabbits. Methods: Male New Zealand rabbits were randomized into four groups: control group, hyperlipidemia group, ZJ group and sivastatin group. The endothelium-dependent relaxation function was evaluated by APV using intravascular Doppler, and the morphology of endothelial cells was detected by light microscopy and electron microscopy, and nitric oxide synthase was evaluated. Results: ZJ reduced the lesions of hyperlipidemia vessels, and the APV after Ach injection of each group was (1.14±0.26), (1.74±0.59), (1.22±0.37) and (1.17±0.41) respectively. The eNOS of each group was (4.21±0.37), (1.43±0.88), (3.95±0.67) and (4.08±0.46) nmol·min-1·g-1 respectively. Conclusion: ZJ can improve the abnormality of endothelial cells and endothelium-dependent relaxation function of hyperlipidemia.
Integrating LCA and LCC Study of FGD System at a Thermal Power Plant in China
Rui Xu,Fengsheng Hou
Journal of Software , 2010, DOI: 10.4304/jsw.5.12.1425-1433
Abstract: This paper presents the integrating Life Cycle Assessment (LCA) and Life Cycle Costing (LCC) study of the Flue Gas Desulphurization (FGD) system in Fengcheng thermal power plant in China. The FGD systems have been installed in a power generation plant to reduce the large amount of SO2 emission. Studies to appraise FGD system in power plant have mainly focused on economic analysis. This paper gives a way of combing LCA and LCC analysis, which can be used to evaluate ecological and economic benefits both before and after the installation of the FGD system. The focus of this study is to consider not only the LCA outcome but also the LCC factors. LCA provides a broad view by generating a model which links the industry to be assessed through all its material and energy resource flows to other environmentally significant processes in the wider industrial network. The Life Cycle Costing was used to provide a comparison between alternative before and after installation of the FGD system. LCC, as a powerful analytical tool, examines the total cost, in net present value terms, of a FGD system over its entire service lifetime. Comparative models of the power plant, before and after the installation of the FGD system, are evaluated using the LCA model. The results indicate that the installation of the FGD system can reduce the acidification problem associated with combustible fossil fuel plants by approximately 97%. The LCC estimation shows the major costs of the FGD system: capital investment, operating and maintenance, and miscellaneous costs. The modeling and model analysis of LCA and LCC for FGD system provide the foundation for assessing the selection of desulphurization technology for large thermal power plant in China; it is also helpful to optimize construction, operation and maintenance of FGD installation.
Socialism and Ecological Crises: A View from China
Yanjie Hou,Jie Xu
Journal of Sustainable Development , 2012, DOI: 10.5539/jsd.v5n4p126
Abstract: In this paper I try to figure out how capital logic caused ecological crises since capitalism developed. Furthermore I attempt to explore the relationship of capital logic and socialist countries. China, being a socialist country, is seriously bothered by ecological crises. I argued wether plan economy or market economy, when the government is deeply influenced by the lure of rapid economy growth, capital logic would dominate society, and ecological crises are inevitable. It is time for China to begin to implement controls on the market to improve ecological outcomes and rethink the concept of socialism. I conclude that ecological crises can be resolved, depending on whether China can move on from its traditional misunderstanding of socialism and make socialism redress the failure of the market. I make some suggestions, including Green GDP, restricted consumerism and narrowing the income gap. These may help to solve the current environmental crisis.
Simplex Subdivisions and Nonnegativity Decision of Forms
Xiaorong Hou,Song Xu
Computer Science , 2009,
Abstract: This paper mainly studies nonnegativity decision of forms based on variable substitutions. Unlike existing research, the paper regards simplex subdivisions as new perspectives to study variable substitutions, gives some subdivisions of the simplex T_n, introduces the concept of convergence of the subdivision sequence, and presents a sufficient and necessary condition for the convergent self-similar subdivision sequence. Then the relationships between subdivisions and their corresponding substitutions are established. Moreover, it is proven that if the form F is indefinite on T_n and the sequence of the successive L-substitution sets is convergent, then the sequence of sets {SLS^(m)(F)} is negatively terminating, and an algorithm for deciding indefinite forms with a counter-example is obtained. Thus, various effective substitutions for deciding positive semi-definite forms and indefinite forms are gained, which are beyond the weighted difference substitutions characterized by "difference".
Research on a High-Efficiency LED Driving Circuit Based on Buck Topology  [PDF]
Renbo Xu, Hongjian Li, Yongzhi Li, Xiaomao Hou
Circuits and Systems (CS) , 2011, DOI: 10.4236/cs.2011.24048
Abstract: A high efficiency LED(Light Emitting Diode) driver based on Buck converter, which could operate under a wide AC input voltage range(85V~265V) and drive a series of high power LEDs, is presented in this paper. The operation principles, power loss factors of the LED driver in this study are analyzed and discussed in detail and some effective ways to improve efficiency are proposed through system design considerations. To verify the feasibility, a laboratory prototype is also designed and tested for an LED lamp which consists of 16 LUMILEDS LEDs in series. Experimental results show that a high efficiency of 92% at I0=350mA can be achieved and the studied driver might be practical for driving high power LEDs. In the last, the overall efficiency over 90% is gained through some experiments under variable input and output voltages and verifies the validity of the designed driver.
Overview of Sub-synchronous Oscillation in Wind Power System  [PDF]
Han Chen, Chunlin Guo, Jianting Xu, Pengxin Hou
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B087
Abstract:

Nowadays with the improvement in the degree of emphasis on new energy, the wind power system has developed more and more rapidly over the world. Usually the wind plants are located in the remote areas which are far from the load centers. Generally series compensated AC transmission and high voltage DC transmission are made use of to improve the transmission capacity as two main effective ways which can solve the problem of large scale wind power transmission. The paper describes the three kinds of impact varieties and impact mechanisms in the sub-synchronous oscillation phenomena of wind power system based on doubly fed induction generator (DFIG) wind generators. At last, we point out the important problem that should be stressed in the wind power system.

Effects of Methylprednisolone on the Expression and Activity of Calpain Following Ischemia-Reperfusion Spinal Cord Injury in Rats  [PDF]
Zifeng Zhang, Jinquan Xu, Yushu Bai, Tiesheng Hou
Neuroscience & Medicine (NM) , 2014, DOI: 10.4236/nm.2014.51005
Abstract:

The present study was undertaken to examine the effects of methylprednisolone on the expression and activity of calpain in spinal cord tissue following spinal cord ischemia-reperfusion injury in rats. Adult male Sprague-Dawley rats were subjected to sham operations, ischemia-reperfusion and vehicle treated, or ischemia-reperfusion with methylprednisolone administration after injury. The expression of calpain I in the injured segments of the spinal cord as well as the degradation of the 68 kD neurofilament protein (NFP), a calpain-specific substrate, was determined at 3 h, 24 h, 72 h and 7 days after reperfusion using immunohistochemical labeling and western blot analysis, respectively. Three hours after spinal cord reperfusion, calpain I-positive cells and NFP degradation products were evident. The number of positive cells and immunoreactivity increased with time and peaked at 72 h after reperfusion. In addition, the number of calpain I-positive cells and the abundance of NFP degradation products were significantly lower in the methylprednisolone group, compared with vehicle treated animals following ischemia-reperfusion injury. The results of this study suggest that methylprednisolone can inhibit the expression and degradation activity of calpain following ischemia-reperfusion injury, providing further insight into the therapeutic benefits of methylprednisolone treatment for spinal cord injury.

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