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Search Results: 1 - 10 of 313109 matches for " 王佳 "
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可溶性糖对植物生长发育调控作用的研究进展
The Regulation of Soluble Sugars in the Growth and Development of Plants
 [PDF]

, 唐中华
Botanical Research (BR) , 2014, DOI: 10.12677/BR.2014.33011
Abstract:

可溶性糖如葡萄糖,蔗糖,在植物的生命周期中具有重要作用。它不仅为植物的生长发育提供能量和代谢中间产物,而且具有信号功能。它也是植物生长发育和基因表达的重要调节因子。在对植物进行调控时,它又与其它信号如植物激素组成复杂的信号网络体系。本文主要阐述可溶性糖对植物生长发育调控作用,以及在调控制过程中与植物激素和环境因子之间相互关系。
Soluble sugars, such as glucose and sucrose, play an important role in the cycle of plant life. They not only provide energy and mid-metabolites, but also act as signals, regulating the growth and development of plant. When regulating the plant, sugars with other signals such as hormone constitute complex transduction web. In this paper, we illuminate the regulation of soluble sugars in the development and growth of plant, and the interaction of soluble sugars and phytohormones, and environment factors.

陈述性偏好法中受访者不确定性的研究综述
A Literature Review on Respondent Uncertainty in Stated Preference Studies
 [PDF]

, 葛姣菊
Modern Marketing (MOM) , 2015, DOI: 10.12677/MOM.2015.53006
Abstract:
陈述偏好法是调查消费者需求的重要手段,但是这种方法由于存在受访者不确定性可能会导致假设误差,有效地处理受访者的偏好不确定性能提高估值效率,目前这个问题尚未引起国内学者的注意。因此本文对陈述偏好法中的受访者不确定性展开系统地综述和评价,分别从产生受访者不确定性的原因、受访者不确定性的测量手段和处理方法三个方面进行梳理总结,指出现有研究的不足之处和未来研究方向及趋势。
Stated preference methods are the main tool for economic valuation of non-market goods and services. However, empirical evidence demonstrates that respondents are often uncertain when answering valuation questions. Respondent uncertainty is often considered as one of the main li-mitations of stated preferences methods, which has received far less attention in Chinese academe. Through a systematic review of the literature, this paper introduces the research achievement of respondent uncertainty in stated preference studies from the angles of causes, measuring methods and treatments. Finally, it points out the directions in future research.
有机缓蚀剂作用机理和脱附行为的研究

腐蚀科学与防护技术 , 1991,
Abstract: 本文使用电位极化、循环极化、交流阻抗及恒电位计时电流等多种电化学技术,研究了本所研制的高效高温浓酸型缓蚀剂——二丙炔氧甲基烷基胺类化合物的缓蚀性能与作用机理以及吸附型有机缓蚀剂的阳极脱附现象。结果表明,炔甲基胺是一类更适用于盐酸的兼有胺和丙炔醇优点而性能更好的高效缓蚀剂。其中,烷基含6和8个碳原子的化合物性能最好。讨论了氯离子协同效应及绥蚀作用机理。
有机缓蚀剂作用机理和脱附行为的研究

腐蚀科学与防护技术 , 1991,
Abstract: 本文使用电位极化、循环极化、交流阻抗及恒电位计时电流等多种电化学技术,研究了本所研制的高效高温浓酸型缓蚀剂——二丙炔氧甲基烷基胺类化合物的缓蚀性能与作用机理以及吸附型有机缓蚀剂的阳极脱附现象。结果表明,炔甲基胺是一类更适用于盐酸的兼有胺和丙炔醇优点而性能更好的高效缓蚀剂。其中,烷基含6和8个碳原子的化合物性能最好。讨论了氯离子协同效应及绥蚀作用机理。
模糊控制在垂直切换判决算法中的应用

计算机应用 , 2012,
Abstract: ?为了满足用户的各种通信需求,垂直切换判决算法中考虑的因素越来越多,判决因素的增加,使得切换判决所需的时间延长,不能够实现快而有效的切换判决,影响了移动终端的实用性。并行模糊控制系统使得各判决因素同时进行模糊推理且大大减少模糊规则的数量,降低了切换判决的时延。把网络可用带宽、用户移动速度及网络的服务费用作为判决因素进入并行模糊控制系统,通过用户服务类型的不同,对各判决因素动态地计算相应的权值,同时各判决因素通过模糊控制系统的输出值与权值对应相乘相加,从而得到最优的切换目标网络。仿真结果表明,该算法增强了切换的准确性,减少了不必要的切换,增强了系统性能。
Ag沉积N、S掺杂改性P25材料对大肠杆菌的抑菌性研究

- , 2016, DOI: 10.13982/j.mfst.1673-9078.2016.2.013
Abstract: 为扩展纳米TiO2光谱响应范围,提高其可见光催化抗菌性能,本文以商业纳米TiO2为原料,采用Ag化学沉积,N、S非金属元素掺杂制备改性P25抑菌材料(Ag-P25、Ag-N-P25、Ag-S-P25),研究这三种材料在可见光下对大肠杆菌的抑菌效果。研究表明,三种抑菌材料对大肠杆菌均有良好的抑制效果,其抑菌率随光照时间延长而不断上升。三种材料抑菌效果的强弱顺序为:Ag-S-P25、Ag-N-P25、Ag-P25。当光照时间为100 min时,三者对大肠杆菌的抑菌率均达100%,与纯P25的抑菌率(79%)相对比,提高了21%。通过扫描电镜观察和提取菌体质粒DNA的电泳检测表明,三种材料对大肠杆菌菌体造成破坏,引起DNA泄漏,导致菌体死亡。通过研究讨论改性P25材料对大肠杆菌的灭活机理,可为具有抗菌功能的新型保鲜材料的研究开发提供理论和实验依据。
To broaden the spectral response of nanoscale TiO2 and to enhance its visible-light photocatalytic antibacterial activity, in this study, chemical deposition of silver (Ag) and the doping of nonmetal elements nitrogen (N) and sulfur (S) was performed to prepare modified P25 antibacterial materials (Ag-P25, Ag-N-P25, and Ag-S-P25) with commercial TiO2 nanoparticles as the raw material. The antibacterial effects of these three P25 materials were studied against Escherichia coli under visible light. The study showed that all the three antibacterial materials had good inhibitory effects on E. coli growth. The antibacterial rate of the modified P25 materials increased with the extension of illumination time under visible light. The antibacterial effects of the three materials were in the following order: Ag-S-P25 > Ag-N-P25 > Ag-P25. When the materials were illuminated for 100 min, the antibacterial rate of Ag-S-P25, Ag-N-P25, and Ag-P25 reached 100%, which was 21% higher than that of pure P25 material. The results from scanning electron microscopy (SEM) and electrophoresis of the bacterial plasmid DNA showed that the E. coli cells were damaged by these three materials, which also caused the leakage of plasmid DNA and led to the death of bacteria. Further study and discussion on the E. coli inactivation mechanism of modified P25 materials can provide a theoretical and experimental foundation for the development of new antibacterial materials for food preservation.
藕合的AKNS方程的可积离散化
Integrable Discretization of the Coupled AKNS Equation
 [PDF]

, 张丽华, 李德生
Advances in Applied Mathematics (AAM) , 2013, DOI: 10.12677/AAM.2013.24021
Abstract:
本文主要研究了藕合的二阶AKNS方程的可积离散化。首先对藕合的二阶AKNS方程的半离散双线性导数方程运用Hirota方法和Maple求出了其新的N-孤子解;然后通过对半离散的双线性导数方程中的时间变量进行离散化,得到全离散的双线性导数方程并对其进行了求解;最后通过适当的变换得出差分差分AKNS方程。
>This paper mainly studied the integrable discretization of the second order coupled AKNS equation. First of all, some new N soliton solutions of the semi-discrete double linear derivative equation of the second order coupled AKNS equation are got by using the Hirota method and Maple. Then, the full discrete bilinear derivative equation is obtained through the method of discrete time of the semi-discrete double linear deriva- tive equation and its N soliton solutions are found out. Finally, the difference-difference AKNS equation is obtained by an appropriate transformation.

深圳房地产价格波动因素研究
Research of Shenzhen Estate Price Fluctuation Factors
 [PDF]

, 蓝裕平
Emergence and Transfer of Wealth (ETW) , 2016, DOI: 10.12677/ETW.2016.62002
Abstract:
自从上世纪90年代以来,我国逐渐推行货币化住房制度以后,我国的房地产业快速发展,推动经济拉动内需并成为国民经济的支柱性产业。房价的飞速上涨对于国家经济的发展,人民的正常生活都造成了巨大影响。目前,我国经济处于转折点,房地产行业正在加速调整。因此,研究影响房地产价格成因对于当下的中国尤其具有迫切性和必要性。对于中国房地产而言,以北上广深的一线城市房价涨幅尤为剧烈,以上城市房价对当地的经济一方面带来正面影响,另一方面,也带来了巨大的负面影响。因此本文将深圳作为研究对象,从国内外研究进行综述,对于影响房地产价格的因素作出深刻剖析,在此基础上利用2004~2013数据,运用相关性分析和线性回归分析进行实证研究。研究发现(以深圳为例)大学生应届毕业人口数,年均商品房销售面积,人均可支配收入,居民消费价格指数对于房地产价格的影响。并提出处理改善和防范措施,对症下药,使得房地产业更好的发展。
Since the beginning of 90’s of the last century, after the gradual implementation of the monetary housing system in China, the estate industry has developed rapidly, and promoted economy to boost domestic demand, which becomes a pillar industry of the national economy. The rapid in-crease in housing price has a great impact on the country’s economic development and people’s normal life. At present, due to the China’s economy at a turning point, the estate industry is acce-lerating adjustment. Therefore, it is urgent and necessary to study the causes influencing estate price. For China’s real estate, housing price is increasing greatly in Beijing, Shanghai, Guangzhou and Shenzhen, bringing positive influence on the local economy, and also negative influence. So this article takes Shenzhen as the research object, reviews from researches at home and abroad, to analyze the factors influencing real estate price, and based on the 2004-2013 data, empirical research is carried out using correlation and linear regression analysis. Study finds that (a case study of Shenzhen) the number of fresh graduates, average annual estate sales area, per capita disposable income, consumer price index influence the real estate price. Moreover, process im-provements and preventive measures are proposed, for better development of real estate.
培养学生自学能力初探

心理科学进展 , 1993,
Abstract: 能力的培养已成教学改革的一个中心问题。中国科学院心理研究所,在初中进行“自学辅导式”教学实验成功的基础上,又根据高中生的特点,遵循心理学原则,研究了“回忆、自学、辅导、讲解”为课堂模式,独立掌握知识,获取技能的能力。“自学辅导”是以教师为主体和主导变为以学生为主体,教师为主导,把重视知识的传授改
Q235钢/NaCl液滴界面微区电化学特征参数分布特征
唐晓,
腐蚀科学与防护技术 , 2010,
Abstract: 本文采用扫描Kelvin探针、扫描振动电极等方法表征了NaCl液滴覆盖下Q235钢表面的微区电化学参数分布的特征.结果证实,NaCl液滴下碳钢表面的电位分布和电流密度分布是不均匀的,中心为阳极区,边缘为阴极区.液滴中心和边缘阴阳极电位相差04V,阴阳极电流密度相差09μA/cm2.NaCl液滴下碳钢表面电化学参数的不均匀分布导致液滴边缘发生强烈的阴极极化,导致附近区域碱性化是微液滴形成的主要原因.
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