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Search Results: 1 - 10 of 115820 matches for " Jun-Feng Yang "
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Poly[[[μ-1,1′-(butane-1,4-diyl)diimidazole-κ2N3:N3′](μ-cyclohexane-1,4-dicarboxylato-κ4O1,O1′:O4,O4′)nickel(II)] 0.25-hydrate]
Chun-Hui Yang,Guang Yang,Zhen-Wu Du,Jun-Feng Lv
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809004024
Abstract: In the title coordination polymer, {[Ni(C8H10O4)(C10H14N4)]·0.25H2O}n, the coordination of the NiII ion is distorted octahedral. The 1,1′-(butane-1,4-diyl)diimidazole ligand and the cyclohexane-1,4-dicarboxylate dianion bridge metal centres, forming a two-dimensional (4,4) network. The network is consolidated by O—H...O hydrogen bonds between the statistically occupied water molecules and O atoms of the two carboxylate groups.
Research on Coordinated Production-Distribution Operation in Manufacturing Supply Chain
生产企业供应链中产销运作协调研究

TIAN Jun-feng,YANG Mei,
田俊峰
,杨 梅

系统工程理论与实践 , 2006,
Abstract: The paper studies coordinated production distribution operation problem in manufacturing supply chain network comprised of single plant,multiple products and multiple distribution centers.A multi period mixed integer programming model is proposed according to the assumptions,whose aim to synchronously optimize production and distribution.Lagrangian relaxation heuristic algorithm is designed to solve the model by equivalent transformation.Finally,a numeral example is given to validate effectiveness of the algorithm.The computational result shows that coordinated production distribution operation can remarkably reduce supply chain cost.
Morphological Phylogeny of the Water Snake Subfamily Homalopsinae (Serpent: Colubridae)
水蛇亚科形态学特征的支序分析

LU Shun-qing,PANG Jun-feng,YANG Datong,
吕顺清

动物学研究 , 2006,
Abstract: The morphological phylogeny of the water snake subfamily Homalopsinae,containing 10 genera,of which seven are monotypic,was not reported up until now. Here fourteen morphological characters were selected for the cladistic analysis. Using software Hennig 86,two phylogenetic trees were inferred and the results showed that the subfamily Homalopsinae was divided into two groups. Compared with the molecular phylonenetic tree of Voris et al(2002),the genera Gerarda and Fordonia are sister groups in both studies; both studies also yielded the same monophyletic lineage,which contained three genera (Cerberus Erpeton Homalopsis). However,the position of the genus Cantoria is distinctly different with the study of Voris et al(2002).
Research on Information Brittleness Structure in Network Communication System
网络通信系统的信息脆性结构的研究

XUE Ping,WU Jun-feng,LIU Yang,
薛萍
,武俊峰,刘洋

计算机科学 , 2011,
Abstract: From system brittleness research point of view, this paper defined all the factors and incidents in a system,which can influence the system and arouse the system brittleness, as brittleness environment These factors and incidents can cause sudden collapse of the system. Based on the brittleness of the system environment, the paper established the network communication system brittleness structure model. Combined with brittleness entropy, process of information brittleness risk in a network information system was analyzed. The result of the analysis shows the practicable of the method. The effectiveness and stability of the system information brittleness structure analysis method were proved in the paper. In the end, through building analysis model of main brittleness factor, the paper applied the analysis method to a specific network information system, and obtained satisfactory results.
Study of Bc --> J/psi pi, etac pi decays with perturbative QCD approach
Sun, Jun-Feng;Du, Dong-Sheng;Yang, Yue-Ling
High Energy Physics - Phenomenology , 2008, DOI: 10.1140/epjc/s10052-009-0872-y
Abstract: The Bc --> J/psi pi, etac pi decays are studied with the perturbative QCD approach. It is found that form factors and branching ratios are sensitive to the parameters w, v, f_J/psi and f_etac, where w and v are the parameters of the charmonium wave functions for Coulomb potential and harmonic oscillator potential, respectively, f_J/psi and f_etac are the decay constants of the J/psi and etac mesons, respectively. The large branching ratios and the clear signals of the final states make the Bc --> J/psi pi, etac pi decays to be the prospective channels for measurements at the hadron colliders
Off-pump coronary artery bypass grafting using a bilateral internal mammary artery Y graft
Cheng-Xiong Gu,Jun-Feng Yang,Hong-Chao Zhang,Hua Wei
老年心脏病学杂志(英文版) , 2012,
Abstract: ObjectiveTo evaluate the outcome of off-pump coronary artery bypass grafting (OPCABG) using a bilateral internal mammary artery (BIMA) Y configuration graft to achieve total arterial myocardial revascularization. Methods From October 2002 to December 2008, 208 patients (196 males and 12 females) underwent OPCABG using a BIMA Y configuration graft. The average age of the patients was 56.5 ± 11.3 years, with an age range of 33–78 years. A total of 167 (80.2%) cases had triple-vessel disease. Left main stem disease was found in 33 (15.9%) cases, and double-vessel disease was found in 8 (3.9%) cases. The semi-skeletonization technique was used to harvest the two internal mammary arteries (IMAs), and then the free right internal mammary artery was connected end-to-side to the left internal mammary artery (LIMA) in situ to complete the Y configuration graft. Off-pump and sequential anastomosis methods were used to perform coronary artery bypass surgery in all patients. Graft patency was assessed intra-operatively with the HT311 transit time flowmeter. Results A total of 728 distal anastomoses were performed in 208 patients, with the average being 3.5 ± 1.3 per person. No one died or experienced recurrent angina within 30 days after the operation. Conclusions OPCABG using the BIMA Y graft was safe and effective to achieve total arterial revascularization. This method avoids surgical operation on the ascending aorta and other incisions.
Robust Efficient MIMO Detector
稳健的高效MIMO检测器

Hu Jun-feng,Zhang Hai-lin,Yang Yuan,
胡军锋
,张海林,杨 远

电子与信息学报 , 2009,
Abstract: The unbiased Minimum Mean-Square Error-Iterative Tree Search (MMSE-ITS) detector, which is known to be one of the most efficient Multi-Input Multi-Output (MIMO) detectors available, is improved by selectively augmenting partial length paths and by adding one bit complement vectors. Simulation and analysis results show that the improved detector provides better detection performance with lower complexity than the unbiased MMSE-ITS detector does. In addition, the improved .detector avoids the clipping operation completely and is robust to any MIMO channels.
Reliable Maintanace of Wireless Sensor Networks for Event-detection Applications
事件检测型传感器网络的可靠性维护

HU Si-quan,YANG Jin-yangWANG Jun-feng,
胡四泉
,杨金阳,王俊峰

计算机科学 , 2011,
Abstract: The reliability maintannace of the wireless sensor network is a key point to keep the alarm messages delivered reliably to the monitor center on time in a event detection application. Based on the unreliable links in the wireless sensor network and the network charateristics of an event detection application, MPRRM, a multiple path redundant reliability maintanace algoritm was proposed in this paper. Both analytical and simulation results show that the MPRRM algorithm is superior to the previous published solutions in the metrics of reliability, false positive rate, latency and message overhead.
Off-pump coronary artery bypass grafting using a bilateral internal mammary artery Y graft

Cheng-Xiong Gu,Jun-Feng Yang,Hong-Chao Zhang,Hua Wei,Ling-Ke Li,

老年心脏病学杂志(英文版) , 2012,
Abstract:
Effect of medium composition on the growth and secretion of cultured root of Astragalus adsurgens Pall
培养基成分对沙打旺组培根生长及分泌物的影响研究

YANG Shan-Yun,MA Yong-Qing,SHUI Jun-Feng,ZHU Yan-Feng,
杨善云
,马永清,税军峰,朱彦锋

中国生态农业学报 , 2005,
Abstract: 研究表明培养基成分可影响沙打旺组培根生长和根分泌物的产生。适宜沙打旺组培根生长的改良B5培养基组分为(以1L标准B5培养基为基础调节,下同)KNO32660.5mg、(NH4)2SO484.1mg、CaCl2.2H2O75.0mg、MgSO4.7H2O125.0mg、FeSO4.7H2O13.9mg、MnSO4.4H2O5.0mg和萘乙酸(NAA)0.6mg。组培根分泌物对沙打旺和小麦胚根生长抑制作用最强的培养基组分为KNO34565.9mg、(NH4)2SO448.1mg、MnSO4.4H2O5.0mg、肌醇150.0mg、烟酸1.5mg、盐酸吡哆辛1.5mg、盐酸硫胺15.0mg、NAA0.8mg和蔗糖50.0g。
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