Stability and electronic spectra of C76N2 isomers     

Teng QW  Wu S 《Journal of Zhejiang University. Science. B》2005,6(6):602-605

INTRODUCTION The synthesis and characterization of het-erofullerenes are very challengeable research topics because of application in superconductivity, photo-electronics, organic magnetism and even nanotubes. Pradeep et al.(1991) studied the interaction between nitrogen and fullerenes and obtained nitrogen deriva-tives of C60 and C70 such as C59N2, C59N4, C59N6 and C70N2 by contact-arc vaporization of graphite in a partial N2 or NH3 atmosphere. Yu et al.(1995) syn-thesized carbon n…  相似文献   

电视制作中涉及的存储技术     

赵腾 《甘肃广播电视大学学报》2005,15(3):19-23

总结了电视制作目前涉及到的存储方式和存储技术.根据电视节目制作特点,对各种存储方式和技术进行了比较,并介绍了多级存储技术在媒体资产管理系统中的应用.  相似文献   

Yimu San improves obstetric ability of pregnant mice by increasing serum oxytocin levels and connexin 43 expression in uterine smooth muscle     

Qi-huan Wang  Shuang Zhang  Li-meng Qin  Wen-jun Zhang  Feng-hua Liu  Jian-qin Xu  Yun-fei Ma  Ke-dao Teng 《Journal of Zhejiang University. Science. B》2017,18(11):986-993

Prolonged farrowing remains one of the critical challenges in intensive pig farming. This study aims to explore the effects and mechanism of Yimu San (YMS), a Chinese veterinary medicine micro mist, on delivery ability with mouse models. Thirty-two pregnant mice were randomly divided into a control group and low-YMS, med-YMS, and high-YMS groups. The labor process time and stillbirth rate were recorded, the levels of serum oxytocin and prostaglandin E₂ (PGE₂) were measured with enzyme-linked immunosorbent assay (ELISA). Contractility measurements of the isolated uterus and the expression of connexin 43 (Cx43) in uterine smooth muscle were evaluated. The results showed that compared with the control group, the birth process time and stillbirth rate in the med-YMS and high-YMS groups were remarkably lower. The in vitro uterine contractions, levels of oxytocin, PGE₂, and Cx43 in the med-YMS and high-YMS groups were significantly higher than those in the control group. The differences of the above measurements between the low-YMS group and the control group were not obvious. It can be speculated that YMS could significantly promote labor in pregnant mice by enhancing the levels of oxytocin, Cx43, and PGE₂.  相似文献   

基于平衡记分卡法的绿色供应链绩效模糊评价模型   总被引：2，自引：0，他引：2  

陈腾  史金平 《武汉职业技术学院学报》2006,5(5):43-46

通过对绿色供应链内涵的分析,结合传统供应链绩效评价的指标体系和平衡记分卡法的四个维度,对绿色供应链绩效进行指标设计,运用模糊数学工具和层次分析法建立绿色供应链绩效评价模型,并进行量化处理。  相似文献   

陕西省中等职业教育发展状况调查     

滕勇 《中国职业技术教育》2006,(23):34-36

本文通过对陕西省中职教育资源状况和对2005届陕西省初中毕业生报考意愿的抽样调查分析。认为根据教育部要求，陕西省中职扩招任务是可以完成的，但仍需克服相当大的困难。  相似文献   

Teachers’ beliefs of behaviors,learning, and teaching related to minority students: a comparison of Han and Mongolian Chinese teachers     

Jian Wang  Xing Teng 《Teaching Education》2016,27(4):371-395

Teachers from mainstream and minority backgrounds teaching in the same school contexts presumably hold different beliefs of learning and teaching about minority students due to their unique prior life and ethnic experiences. Teachers in similar school environments are also assumed to share beliefs of teaching and learning about their students because of the influences of their similar school contexts despite their different prior life and ethnic experiences. This study examines the two contentious assumptions by surveying the beliefs of behavior, learning, and teaching that the mainstream Han and minority Mongolian Chinese teachers in the same school contexts hold about their Mongolian Chinese students. It found that the two groups agreed that teachers’ inadequate planning and management were the major sources of their students’ behavior problems while students’ home backgrounds, abilities, and efforts explained their learning failure or success. Both believed that students’ emotional and social problems were more important than their learning problems for them to attend to, and their expertise in helping students develop self-worth was more important than their expertise in curriculum and pedagogy. Both preferred to vary teaching standards, content, and methods to accommodate students’ differences and offer opportunities for students to discover things themselves.  相似文献   

Effect of Flow Directions on Multiphase Flow Boiling Heat Transfer Enhanced by Suspending Particles in a Circulating Evaporation System     

Jiang  Feng  Jiang  Teng  Qi  Guopeng  Li  Xiulun 《天津大学学报(英文版)》2019,25(3):201-213

A circulating fluidized bed evaporator(including down-flow, horizontal, and up-flow beds) was constructed to study the effect of flow directions on multiphase flow boiling heat transfer. A range of experimental investigations were carried out by varying amount of added particles(0-2%), circulation flow rate(2.15-5.16 m~3/h) and heat flux(8-16 kW/m~2). The comparison of heat transfer performance in different vertical heights of the horizontal bed was also discussed. Results reveal that the glass bead particle can enhance heat transfer compared with vapor-liquid two-phase flow for all beds. At a low heat flux(q = 8 kW/m), the heat-transfer-enhancing factor of the horizontal bed is obviously greater than those of the up-flow and down-flow beds. With the increase in the amount of added particles, the heat-transfer-enhancing factors of the up-flow and down-flow beds increase, whereas that of the horizontal bed initially increases and then decreases. However, at a high heat flux(q=16 kW/m), the heat-transfer-enhancing factors of the three beds show an increasing tendency with the increase in the amount of added particles and become closer than those at a low heat flux. For all beds, the heat-transfer-enhancing factor generally increases with the circulation flow rate but decreases with the increase in heat flux.  相似文献   

Optimal local sensor decision rule for target detection with channel fading statistics in multi-sensor networks     

Yongsheng Yan  Haiyan Wang  Teng Xue  Xuan Wang 《Journal of The Franklin Institute》2017,354(1):530-555

In this paper, we investigate the optimal local sensor decision rule based on non-ideal transmission channels between local sensors and the fusion center for distributed target detection system. The optimality of a likelihood-ratio test (LRT)-based local decision rule at local sensor, which requires only the knowledge of channel statistics instead of instantaneous channel state information (CSI), is established. The coupled local decision rule at each sensor is derived in a closed-form for coherent BPSK and OOK and non-coherent OOK. The iterative person-by-person optimization (PBPO) algorithm is employed to solve the coupled local thresholds. Simulation analysis reveals that the derived thresholds according to the local decision rule are consistent to the exhaustive searching. Furthermore, the detection performance of the system with the proposed optimal local decision rule for different reception modes and modulations is analyzed and compared.  相似文献   

项目型组织成员知识转移动机实证研究—与组织情境的跨层次作用          下载免费PDF全文

马腾  曹吉鸣  王立强 《科研管理》2017,38(11):126-136

知识是项目型组织(project-based organizations,PBOs)持续发展的关键资源,其有效地转移和共享不但有助于项目的成功,更有利于PBOs的长远发展。本研究运用多层线性模型,通过采集和分析来自中国建筑第*工程局有限公司的480个项目型组织样本问卷数据,探讨组织情景对项目型组织成员知识转移动机和知识转移效果的跨层次影响。结果表明:知识转移动机是决定知识转移行为的关键所在;组织情境差异化影响成员的知识转移动机和知识转移效果。这一发现揭示了组织情景影响成员知识动机和知识转移效果的内在机理,拓展了主流文献的相关研究,并为项目型组织知识管理实践提供借鉴。  相似文献   

地区差异下居民消费对用水量的影响分析——基于门槛模型的实证研究     

金巍  章恒全  秦腾  毛广雄  刘双双 《软科学》2017,(6)

基于Hansen非动态面板门槛回归模型,从全国和东部、中部和西部三大区域就居民消费对用水量的门槛效应进行实证分析,结果表明:在居民收入和人力资本的作用下,居民消费对用水量的影响存在显著的门槛效应.全国层面,居民消费对用水量的弹性系数呈现先降后升的变化形态,但增幅降低;区域层面,东部居民消费对用水量的促进作用逐渐降低,西部居民消费促进用水量的增长,中部门槛检验不显著.进一步分析发现:经济发展,特别是城镇化影响门槛值和弹性系数的大小,人力资本作为门槛变量时居民消费对用水量的影响最大.  相似文献