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Search Results: 1 - 10 of 19737 matches for " Zehui Chang "
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Heat Transfer Modelling of Plate Heat Exchanger in Solar Heating System  [PDF]
Yan Jia, Can Wang, Zehui Chang, Wenxiong Li, Chi Zhang
Open Journal of Fluid Dynamics (OJFD) , 2017, DOI: 10.4236/ojfd.2017.73029
Abstract:
Plate heat exchanger can obtain higher thermal performance because of its advantages in high heat transfer coefficient, small scale, and can realize pure counter current flow. It has been widely applied in HVAC industry. In this paper, the numerical research of plate heat exchanger in solar heating system has been proposed. Aimed at the type of herringbone corrugated plate which has better thermal performance and been widely used, the three dimensional model is established by Gambit software. Using FLUENT software for numerical calculation, by studying the effect of corrugated inclination angle, corrugated depth, corrugated spacing and inlet velocity of heat exchanger on internal temperature, pressure, velocity distributions of domains, the relationship between the above parameters and the Nusselt Number and the pressure drop was obtained by simulation data. Heat transfer coefficient and pressure drop correlations used to measure the overall performance of the heat exchanger. The result shows that the optimal structure parameters is corrugated angle 60°, corrugated depth 4 mm and corrugated spacing 16 mm.
Who Benefits from Altruism in Supply Chain Management?  [PDF]
Zehui Ge, Qiying Hu
American Journal of Operations Research (AJOR) , 2012, DOI: 10.4236/ajor.2012.21007
Abstract: The significant effect of social preference on strategic behavior has been convinced by recent research. Along this stream of research, we study firms’ altruistic incentives in supply chains since the selfish rationality can’t deal with economic behaviors. We show that the performance of the supply chain in consideration of altruism is between those of scenarios under decentralization and under integration. We further shows that a manufacturer, as a leader, should find an egoistic retailer, while a retailer, as a follower, should find a manufacturer with altruistic liability, to form a good chain.
Chronology and geochemistry of lamprophyre dykes from Beishan area, Gansu province and implications for the crust-mantle interaction.
甘肃北山地区煌斑岩的年代学和地球化学及其壳幔作用过程讨论

LIU Chang,ZHAO ZeHui,and GUO ZhaoJie,
刘畅 赵泽辉[
,] 郭召杰

岩石学报 , 2006,
Abstract: 柳园地区下二叠统中发育多条煌斑岩脉,并且在空间上和二叠纪玄武岩、辉长岩和超镁铁岩关系密切。煌斑岩K-Ar、Ar-Ar定年测定表明岩脉侵入时间在220~240Ma之间。地球化学表现为富集大离子亲石元素和轻稀土,亏损高场强元素(Ta-Nb-Ti、Zr、Hf)的特征。Sr-Nd同位素以高的(^87Sr/^86Sr)i 0.708616~0.708744,较低的εNd(t)-3.89~-2.14为特征。Nb/Ta(16.16~19.14,相对于原始地幔的17.5)、Zr/Hf(42.14~43.95,相对于原始地幔的36.7)以及Ta.Nd.Ti的亏损,显示源区可能和早期俯冲洋壳或造山带根部拆沉组份脱水、富集流体交代岩石圈地幔有关。本区煌斑岩为二叠纪裂谷发展到后期,富集流体上涌,交代岩石圈地幔部分熔融,并沿断裂侵入的产物;是二叠纪开始的裂谷作用和火山活动晚期阶段产物。
General Cell-Binding Activity of Intramolecular G-Quadruplexes with Parallel Structure
Tianjun Chang, Cui Qi, Jie Meng, Nan Zhang, Tao Bing, Xianda Yang, Zehui Cao, Dihua Shangguan
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0062348
Abstract: G-quadruplexes (G4s) are four-stranded nucleic acid structures adopted by some repetitive guanine-rich sequences. Putative G-quadruplex-forming sequences (PQSs) are highly prevalent in human genome. Recently some G4s have been reported to have cancer-selective antiproliferative activity. A G4 DNA, AS1411, is currently in phase II clinical trials as an anticancer agent, which is reported to bind tumor cells by targeting surface nucleolin. AS1411 also has been extensively investigated as a target-recognition element for cancer cell specific drug delivery or cancer cell imaging. Here we show that, in addition to AS1411, intramolecular G4s with parallel structure (including PQSs in genes) have general binding activity to many cell lines with different affinity. The binding of these G4s compete with each other, and their targets are certain cellular surface proteins. The tested G4s exhibit enhanced cellular uptake than non-G4 sequences. This uptake may be through the endosome/lysosome pathway, but it is independent of cellular binding of the G4s. The tested G4s also show selective antiproliferative activity that is independent of their cellular binding. Our findings provide new insight into the molecular recognition of G4s by cells; offer new clues for understanding the functions of G4s in vivo, and may extend the potential applications of G4s.
Interfacial tension and wall energy of a Bose-Einstein condensate binary mixture: triple-parabola approximation
Zehui Deng,Bert Van Schaeybroeck,Chang-You Lin,Nguyen Van Thu,Joseph O. Indekeu
Physics , 2015, DOI: 10.1016/j.physa.2015.10.063
Abstract: Accurate and useful analytic approximations are developed for order parameter profiles and interfacial tensions of phase-separated binary mixtures of Bose-Einstein condensates. The pure condensates 1 and 2, each of which contains a particular species of atoms, feature healing lengths $\xi_1$ and $\xi_2$. The inter-atomic interactions are repulsive. In particular, the effective inter-species repulsive interaction strength is $K$. A triple-parabola approximation (TPA) is proposed, to represent closely the energy density featured in Gross-Pitaevskii (GP) theory. This TPA allows us to define a model, which is a handy alternative to the full GP theory, while still possessing a simple analytic solution. The TPA offers a significant improvement over the recently introduced double-parabola approximation (DPA). In particular, a more accurate amplitude for the wall energy (of a single condensate) is derived and, importantly, a more correct expression for the interfacial tension (of two condensates) is obtained, which describes better its dependence on $K$ in the strong segregation regime, while also the interface profiles undergo a qualitative improvement.
Mechanics Analysis of Overhead Transmission Lines Based On-line Monitoring  [PDF]
Lili Dai, Yongli Zhu, Zehui Liang
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.32B001
Abstract: At present, the on-line monitoring is widely applied to the power line monitoring. In this paper, a new mechanical calculation model is established according to the on-line monitoring. And this model is based on the parameters that tension sensors and angle sensors on suspended points detect, and combines with the parameters of the wire itself, and also considers the deflection angel of wires due to wind. In this model, mechanics parameters of wires are turned into the new coordinate plane after deflection angel of wires due to wind, or windage yaw plane. A statics tension balance equation is built in the vertical direction of the new windage yaw plane. According to the theoretical analysis and algorithm, we verify the accuracy of this newly developed mechanical calculation model.
Comparison of Three Modes of AT-fed Traction Power Networks  [PDF]
Qingan Ma, Qunzhan Li, Zehui Mi
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B196
Abstract:

The features of three modes of AT-fed traction power networks (TPNs) have been briefly described in the existing literature, which is not adequate yet. In this paper, these three modes of TPNs are compared mainly on TPN capacity, transformer capacity, rail potential and voltage level, etc., and conclusions are drawn.

时序驱动的详细布局方法
刘畅, 郭泽晖, 贺旭, 郭阳
LIU Chang
, GUO Zehui, HE Xu, GUO Yang

- , 2018, DOI: 10.11887/j.cn.201801010
Abstract: 针对超大规模集成电路布局过程中时序优化问题, 提出一种时序驱动的详细布局方法。对设计进行时序分析并获取时序违反路径集合, 对路径上两个连续固定单元间的线网进行平滑处理,以减小路径曲折度以及减少线长。再针对每一个可移动单元与其相邻的线网建立二次规划时序模型,求解局部最优布局位置。对于给定的测试电路,实验结果表明,最差的时序违反与总的时序违反均有明显改善,采用ICCAD 2015竞赛的测试模板和评价方法,总的时序性能有45~350 min的提升。
To cope with the timing problem of placement in the very large integrated circuit, a timing-driven optimization method for placement was proposed. Firstly, the design was analyzed by a timing evaluation tool and the timing violation paths were collected. A rough placement method was used on the moved cells between any two successive fixed cells in those paths to smooth the nets. After that, a detailed placement based on quadratic timing model was used to optimize the timing characteristics. For the given benchmarks and the evaluation method in ICCAD 2015 contest, the experimental results show that both the worst negative slack and the total negative slack are improved, and the overall timing performance is improved by 45~350 min.
Effective of Microwave-KOH Pretreatment on Enzymatic Hydrolysis of Bamboo  [PDF]
Zhiqiang Li, Zehui Jiang, Benhua Fei, Yan Yu, Zhiyong Cai
Journal of Sustainable Bioenergy Systems (JSBS) , 2012, DOI: 10.4236/jsbs.2012.24015
Abstract: Bamboo, with its advantages of fast growth, short renovation, easy propagation and rich in cellulose and hemicellulose, is a potential feedstock for bioethanol or other biofuels production. The objective of this study was to examine the feasibility of microwave assistant KOH pretreatments to enhance enzymatic hydrolysis of bamboo. Pretreatment was carried out by immersing the bamboo in KOH (12% and 8% w/w bamboo) solutions and exposing the slurry to microwave radiation power of 400 W for 30min. Chemical composition of the pretreated substrates and spent liquor was analyzed. Pretreated substrates were enzymatic hydrolyzed, and glucose and xylose in the hydrolysate were analyzed. The results showed that the pretreated substrate with microwave assisted KOH had significantly higher sugar yield than the untreated samples. The fermentation inhibitors formic acid, furfural, HMF and levulinic acid were much lower than acid pretreatment reported.
Effects of Nourishing “Yin”-Removing “Fire” Chinese Herb Mixture on the Expression of GABAB Receptors in Hypothalamus of Precocious Puberty Female Rats  [PDF]
Zhejun Chen, Zehui Meng, Shiran Wang, Liting Zhu, Zhanzhuang Tian
Chinese Medicine (CM) , 2016, DOI: 10.4236/cm.2016.72008
Abstract: Objectives: To investigate the potential role of GABAB Receptors (GABABRs) involved in the effect of Nourishing “Yin”-Removing “Fire” Chinese herb mixture (TCM) treatment on precocious puberty. Methods: Female Sprague-Dawley rats were randomly divided into four groups: normal (N), central precocious puberty (CPP) model (M), CPP fed with normal saline (S) and CPP fed with Nourishing “Yin”-Removing “Fire” Chinese herb mixture (TCM). Rats of postnatal day 5 were given a single subcutaneous injection of 240 μg danazol to establish CPP model rats. Rats of S and TCM groups were continuously administered with saline or nourishing “Yin”-removing “Fire” Chinese herb mixture since postnatal day 15. The expression of GABABRs was detected by means of real-time PCR and immunohistochemistry. Results: The expression of hypothalamic GnRH mRNA in M was significantly increased on the day of pre-puberty when compared with that of N (P < 0.01). On the day of onset-puberty, LH levels were higher in M than those in N (P < 0.01), while the serum E2 and LH levels of TCM decreased when compared with those of M (P < 0.05). On the day of pre-puberty, the number of GABAB1 receptor (GABABR1) immunoreactive cells in the arcuate nucleus (ARN) was decreased in M when compared with that of N (P < 0.05) and increased in TCM compared with that of M (P < 0.05); simultaneously, the expression of GABABR1 mRNA in hypothalamus was significantly decreased in M when compared with that of N (P < 0.01) and increased in TCM compared with that of M (P < 0.01). On the day of onset-puberty, the number of GABABR1 immunoreactive cells in medial septum (MS) was decreased in M compared with that in N (P < 0.05) and increased in TCM comparing with that of M (P < 0.05); meanwhile, the mRNA expression of GABABR1 in hypothalamus was decreased in M compared with that in N (P < 0.05), while the numbers of GABAB2 receptor (GABABR2) immunoreactive cells in the ARN, MS and diagnonal band of broca (DBB) were decreased in M when compared with those of N (P < 0.05) and increased in TCM compared with those of M (P < 0.05) on the day of onset-puberty. At the same time, the mRNA expression of GABABR2 was significantly decreased in M compared with that of N (P < 0.01). Conclusions: These results indicated that the GABABRs might
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