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Search Results: 1 - 10 of 18633 matches for " Zhenguo Han "
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The Evolution of Contestable Markets: A Computing Simulation  [PDF]
Zhenguo Han, Hui Zhang, Minrong He
iBusiness (IB) , 2010, DOI: 10.4236/ib.2010.23037
Abstract: This paper introduces a computing simulation of the evolution of contestable markets. The results show that the evolving outcome of contestable markets is a monopoly when the market demand is fixed. This computing simulation also tells us how information to influence the evolution of contestable markets. In the end, some advices are provided.
Influence of magnetic field on nitric oxide and neuropeptide Y in rat adrenal gland
Zhenguo Luo,Qingguo Han,Xiaoyun Zhang
Chinese Science Bulletin , 2001, DOI: 10.1007/BF02901908
Abstract: We have investigated the effects of magnetic fields on nitric acid (NO) and neuropeptide Y (NPY) on adrenal glands of the rat using NO nitric acid reductase-spectrophotometry d histochemistry techniques. We found that all cellular layers of the adrenal cortex, including zona glomerulosa, zona fasciculata and zona reticularis were stained by NADPH-d, and some chromaffin cells of the medulla were positive for NPY. Furthermore, magnetic fields increased NO so strongly that high NO levels could be maintained for several hours, as well as some neuroganglion cells in medulla that were double-stained for NPY and NADPH-d. Our data showed that the magnetic field can regulate endocrine and neuroendocrine directly by some action on parenchyma cells, or indirectly by action to NO-ergic, NPY-ergic neurons in the adrenal gland.
Molecular mechanism of effect of rotating constant magnetic field on organisms
Xiaoyun Zhang,Zhenguo Luo,Xiaoyang He,Qingguo Han,Weide Zhang
Science China Life Sciences , 2001, DOI: 10.1007/BF02882398
Abstract: The effect of RCMF-magnetic therapy apparatus on signal substances was studied. The radioimmunoassay (RIA) suggested that the magnetic field increased β-endorphin markedly in plasma. ELISA indicated that the magnetic field inhibited vomiting reaction induced by chemotherapy drug, with reversible decrease of serotonin (5-HT) level in brains, small intestine tissue and serum. Furthermore, the bioeffect of magnetic fields on 5-HT level presented a typical window effect and post-effect, and the inhibitory effect of magnetic field on the emesis was parallel to the decrease level of 5-HT. This result implied that the decrease of 5-HT might be the basis of rotating constant magnetic field (RCMF) inhibiting drug-induced emesis. The nitric acid reductase-spectrophotometry and nicotinamide adenine dinucleotide-diaphorase/arginine-vasopressin (AVP) cytochemistry technique showed that the magnetic field induced nitric oxide (NO) increase in hypothalamus and the high NO(A) level lasted for 3 hours. The results suggested that NO(A) increases after the treatment of the magnetic field in hypothalamus, which may result from strong expression of NO-ergic neuron in paraventricular hypothalamic nucleus (PVN), periventricular hypothalamic nucleus (PEN) and supraoptic nucleus (SON). The coexistence of NO and AVP may play an important role in the regulation of endocrine and neuroendocrine by the magnetic field. And our data also confirmed that the magnetic field increased the content of NO so strongly that high NO level lasted for 3 hours, also made neuropeptide Y (NPY) cell in medulla stained heavily.
Countably Many Positive Solutions for Nonlinear Singular n-Point Boundary Value Problems  [PDF]
Zhenguo Li, Youlin Shang
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.515220
Abstract:

In this paper, a fixed-point theorem has been used to investigate the existence of countable positive solutions of n-point boundary value problem. As an application, we also give an example to demonstrate our results.

Simulation and Analysis of Hydrogen Production by Dimethyl Ether Steam Reforming for PEMFC  [PDF]
Zhenguo Luo, Cong Li
Journal of Power and Energy Engineering (JPEE) , 2016, DOI: 10.4236/jpee.2016.45004
Abstract: Energy crisis has become a serious global problem, and Proton exchange membrane fuel cell (PEMFC) has played an important role in the solution of the energy crisis. The hydrogen production process by dimethyl ether steam reforming for PEMFC was studied. The yield of H2 and energy efficiency of system with different mass ratios (0.3:0.7, 0.35:0.65, 0.4:0.6) of dimethyl ether (DME) and steam were analyzed, and both of yield of H2 and energy efficiency of system increased with the increase of the mass ratio of DME and steam. The energy efficiency of hydrogen production system using reactor as heat source and hydrogen production system using engine exhaust gas as heat source is compared, and energy efficiency of using reactor as heat source (57.96117%, 63.89651%, 69.0002%) is higher than that using engine exhaust gas as heat source (54.4913%, 60.11311%, 66.25342%).
A New Type of Double-Lumen Catheter to Replace Current One in RCA  [PDF]
Yingfeng Xue, Zhenguo Yu
International Journal of Clinical Medicine (IJCM) , 2016, DOI: 10.4236/ijcm.2016.79068
Abstract: Objective: To replace the peripheral venous puncture for blood sampling with taking blood samples extracorporally from arterial line before predilution during RCA-CRRT performed. Methods: A new type of double-lumen femoral catheter was used instead of the current tubes. The new type of double-lumen tube had a greater distance from the inner venous ports to the inner arterial ports than current tubes. The minimum distance from the venous port to the arterial port was greatly lengthened. Replacement solution contained citrate, zero Ca2+, zero bicarbonate, low Na+. Blood samples were synchronously collected from the arterial line before the infusion of citrate replacement fluid and from the peripheral vein. The iCa concentration data of two groups were analyzed to observe the difference between iCa concentration levels in the arterial line and in peripheral vein; the anticoagulant effect of RCA and possible complications were observed, such as bleeding, clottings and hypocalcaemia. Results: 28 times of RCA-CRRT were performed on17 AKI and CRF patients with active bleeding or at the high risk of bleeding; 336 blood samples were collected. Statistics showed that the difference of iCa concentration between arterial line group and the peripheral vein group was not significant (P = 0.9), there is a high degree of similarity between the iCa concentration of arterial line blood and the peripheral venous blood. None of the patients developed citrate toxicity or metabolic alkalosis. None induced bleeding, or bleeding aggravated. No obvious clotting occurred. Systemic calcium concentration was achieved in the ideal range. Conclusion: In clinical practice, the data of iCa concentration from arterial line can be used to replace that from peripheral vein when the new type of double-lumen femoral catheter is placed in femoral vein. RCA-CRRT therapy is safe and effective.
The spatial distribution of cis regulatory elements in yeast promoters and its implications for transcriptional regulation
Zhenguo Lin, Wei-Sheng Wu, Han Liang, Yong Woo, Wen-Hsiung Li
BMC Genomics , 2010, DOI: 10.1186/1471-2164-11-581
Abstract: We found a sharp peak for the distribution of TFBSs at ~115 bp upstream of the TSS, but no clear peak when the translation start codon was used as the reference point. Our analysis of sequence variation data among 63 yeast strains revealed very low deletion polymorphisms in the region between the distribution peak and the TSS, suggesting that the distances between TFBSs and the TSS have been selectively constrained in evolution. As in previous studies, we found that the nucleosome occupancy and the presence/absence of TATA-box in the promoter region affect the TFBS distribution pattern. In addition, we found that there exists a correlation between the 5'UTR length and the TFBS distribution pattern and we showed that the TFBS distribution pattern affects gene transcription level and plasticity.The spatial distribution of TFBSs obtained using the TSS as the reference point shows a much sharper peak than does the distribution obtained using the translation start codon as the reference point. The TFBS distribution pattern is affected by nucleosome occupancy and presence of TATA-box and it affects the transcription level and transcription plasticity of the gene.The binding of gene-specific transcription factors (TFs) to the TF binding sites (TFBSs) in the promoter region is required for the initiation of gene transcription. In the last decade, extensive efforts have been made to identify TFBSs in Saccharomyces cerevisiae using both experimental and computational approaches [1-9]. These data are useful for studying the spatial distribution of TFBSs on yeast promoters. This distribution may be used to address questions on gene regulation such as whether there exists a "preferred zone" in the promoter for TF binding and how strongly the position of a TFBS affects the transcriptional output of a gene.In S. cerevisiae, several studies have revealed that TFBSs are not uniformly distributed over the promoter region [2-4,10,11]. For example, using computational tools to search f
Multiple Positive Periodic Solutions for Two Kinds of Higher-Dimension Impulsive Differential Equations with Multiple Delays and Two Parameters
Zhenguo Luo
Journal of Mathematics , 2014, DOI: 10.1155/2014/214093
Abstract: By applying the fixed point theorem, we derive some new criteria for the existence of multiple positive periodic solutions for two kinds of?? -dimension periodic impulsive functional differential equations with multiple delays and two parameters: ), a.e., , , , , , and ), a.e., , , , , , As an application, we study some special cases of the previous systems, which have been studied extensively in the literature. 1. Introduction Let , , , , , and , respectively. Denote by the set of operators which are continuous for , and have discontinuities of the first kind at the points but are continuous from the left at these points. For each , the norm of is defined as . Let denote the Banach space of bounded continuous functions with the norm , where . The matrix means that each pair of corresponding elements of and satisfies the inequality . In particular, is called a positive matrix if . Impulsive differential equations are suitable for the mathematical simulation of evolutionary process whose states are subject to sudden changes at certain moments. Equations of this kind are found in almost every domain of applied sciences, and numerous examples are given in [1–4]. In recent years, the existence theory of positive periodic solutions of delay differential equations with impulsive effects or without impulsive effects has been an object of active research, and we refer the reader to [5–17]. Recently, in [5], Jiang and Wei studied the following nonimpulsive delay differential equation: They obtained sufficient conditions for the existence of the positive periodic solutions of (1). Motivated by [5], in [6], Zhao et al. investigated the following impulsive delay differential equation: They derived some sufficient conditions for the existence of the positive periodic solutions of (2). In [7], Huo et al. considered the following impulsive delay differential equation: They got sufficient conditions for the existence and attractivity of the positive periodic solutions of (3). Motivated by [5–7], in [8], Zhang et al. studied the following impulsive delay differential equation: They obtained some sufficient conditions for the existence of the positive periodic solutions of (4). However, to this day, only a little work has been done on the existence of positive periodic solutions to the high-dimension impulsive differential equations based on the theory in cones. Motivated by this, in this paper, we mainly consider the following two classes of impulsive functional differential equations with two parameters: with initial conditions: where and , , are -periodic; that is, ,
The Study on Influencing Factors of Team Brainstorming Effectiveness
Zhenguo Zhao,Jialin Hou
International Journal of Business and Management , 2009, DOI: 10.5539/ijbm.v5n1p181
Abstract: Brainstorming is a creative and innovative tool. As a team problem-solving tool, team brainstorming can help the team conceive a lot of creative ideas and methods. Through a review of relevant literatures, this paper summarizes the three main factors of team brainstorming effectiveness: the heterogeneity of team composition, processing mode of team social information and interactive mode of team members. In addition, a conceptual model is built to show the interaction among the three.
Existence of solutions to n-th order neutral dynamic equations on time scales
Qiaoluan Li,Zhenguo Zhang
Electronic Journal of Differential Equations , 2010,
Abstract: In this article, we study n-th order neutral nonlinear dynamic equation on time scales. We obtain sufficient conditions for the existence of non-oscillatory solutions by using fixed point theory.
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