MIMO HSDPA系统中的chip级空时均衡接收方案

提出了一种频率选择性衰落环境下多输入多输出高速下行分组接入(MIMO HSDPA)系统中chip级的空时均衡接收方案, 以消除多天线和多码扩频传输时产生的严重的码间干扰和共信道间干扰; 并推导出分数采样时的空时均衡接收机以进一步提高接收机性能, 然后给出分析和接收信干噪比来设计最优权重. ITU Pedestrian A信道环境下的仿真结果验证了本文的分析和接收机优越的性能.     

牛顿环实验的研究

利用公式推理和实践测量对牛顿环实验中环中心出现亮纹、环内凹、环中心出现较大暗斑的变形牛顿环进行了分析，结果表明，环中心出现亮纹、环内凹变形牛顿环对透镜曲率半径测量结果无影响，而环中心出现较大暗斑的变形牛顿环会使透镜曲率半径的测量结果偏大于真值。     

Interference and Inhibition in Cognition and Behavior: Unifying Themes for Educational Psychology

In this article, we review modern work on interference and inhibition in cognition and behavior. We begin by briefly reviewing the historical and conceptual roots of this new body of work. Next we discuss five new theoretical frameworks that use the concepts of interference and inhibition to explain cognitive and behavioral phenomena. In the section that follows, we review evidence of individual and developmental differences in inhibition and susceptibility to interference in at-risk students. We then consider the implications of this new body of work for research on educational psychology by discussing six selected areas of research: intelligence, strategies, reading comprehension, logical and mathematical reasoning, self-regulated learning, and retention. In the next section, we explore four critical issues that pose significant challenges to research in inhibition and interference. Finally, we discuss the relevance of this work to educational practice by focusing on its implications for the curriculum and instruction. Throughout, our principal goal is to bring this new body of work to the attention of the readers of this journal and to show how it might be useful in guiding research and theory in educational psychology.     

多元智力理论应用于多媒体外语教学的探讨

文章主要介绍了美国哈佛大学心理学教授加德纳博士(Gardner)在对人类潜能研究的基础上提出的多元智力理论,该理论为我们更好地理解外语学习者的个体差异,认识外语教学,特别是为多媒体外语教学提供了一个崭新的视角。多媒体外语教学能更好地满足不同智力特点的学习者的发展需要。同时,文章还针对多媒体网络教学存在的一些问题提出了相应的解决措施。     

论光源位置与杨氏干涉条纹变化的关系

双缝干涉是分波面法干涉的典型例子,本文讨论了光源位置对干涉条纹的影响和光源移动速度与干涉条纹移动速度间的关系。     

高职院校英语文化环境现状调查及对策分析

高职院校英语教学和英语学习仍在沿袭以往的传统模式,大部分高职院校教学管理者、英语教师和学生没有"英语文化环境"这一概念,也没有尝试通过优化英语文化环境来提高英语教学质量.文章通过探讨英语文化环境和英语学习的关系,引入多元智能理论即MI理论,探索优化高职院校英语文化环境的各种途径,协助高职学生在均衡发展多元智能同时提高英语实际应用能力.     

Cornuside alleviates experimental autoimmune encephalomyelitis by inhibiting Th17 cell infiltration into the central nervous system

The present study was conducted to clarify the therapeutic effect of cornuside on experimental autoimmune encephalomyelitis(EAE) and its influence on T helper 17(Th17) cell and regulatory T(Treg) cell infiltration into the central nervous system. Rats were randomly placed into four treatment groups: control, EAE, EAE+cornuside, and EAE+prednisolone. The neurological function scores of rats were assessed daily. On the second day after EAE rats began to show neurological deficit symptoms, the four groups were treated with normal saline, normal saline, cornuside(150 mg/kg), and prednisolone(5 mg/kg), respectively. The treatment was discontinued after two weeks, and the spinal cord was obtained for hematoxylin and eosin(HE)and luxol fast blue staining, as well as retinoic acid receptor-related orphan receptor γ(RORγ) and forkhead box protein P3(Foxp3) immunohistochemical staining. Blood was collected for Th17 and Treg cell flow cytometry testing, and the serum levels of interleukin(IL)-17 A, IL-10, transforming growth factor-β(TGF-β), IL-6, IL-23, and IL-2 were measured via enzymelinked immunosorbent assay(ELISA). Compared with rats in the EAE group, rats in the EAE+cornuside and EAE+prednisolone groups began to recover from neurological deficits earlier, and had a greater degree of improvement of symptoms. Focal inflammation, demyelination, and RORγ-positive cell infiltration were reduced by cornuside or prednisolone treatment, whereas the Foxp3-positive cell numbers were not significantly different. Meanwhile, the number of Th17 cells and the IL-17 A, IL-6,and IL-23 levels were lower in the blood after cornuside or prednisolone treatment, whereas the number of Treg cells or the levels of IL-10, TGF-β, and IL-2 were not markedly different. Cornuside can alleviate symptoms of EAE neurological deficits through its anti-inflammatory and immunosuppressive effects, and Th17 cells may be one of its therapeutic targets.     

植物多倍体基因组的形成与进化

多倍化是植物进化变异的自然现象，也是促进植物发生进化改变的重要力量。在被子植物中，约 70％的种类在进化史中曾发生过一次或多次多倍化的过程。目前的研究结果表明，自然界绝大多数多倍体是通过未减数配子的融合而形成的，并且很多多倍体种是通过多次独立的多倍化过程而重复发生的。由多倍化所导致的重复基因在多倍体基因组中可能有三种不同的命运，即：保持原有的功能、基因沉默或分化并执行新的功能。多倍化以后，重复基因组的进化动态则主要表现在染色体重排和“染色体二倍化”、不同基因组之间的相互渗透、以及核-质之间的相互作用等方面。     

Performance prediction of data fusion for information retrieval

The data fusion technique has been investigated by many researchers and has been used in implementing several information retrieval systems. However, the results from data fusion vary in different situations. To find out under which condition data fusion may lead to performance improvement is an important issue. In this paper, we present an analysis of the behaviour of several well-known methods such as CombSum and CombMNZ for fusion of multiple information retrieval results. Based on this analysis, we predict the performance of the data fusion methods. Experiments are conducted with three groups of results submitted to TREC 6, TREC 2001, and TREC 2004. The experiments show that the prediction of the performance of data fusion is quite accurate, and it can be used in situations very different from the training examples. Compared with previous work, our result is more accurate and in a better position for applications since various number of component systems can be supported while only two was used previously.     

基于进入权理论的技术创新网络治理分析

本文运用进入权理论对企业技术创新的网络化治理作尝试性分析与研究。认为企业是创新的主体,以知识经济为主要特征的经济全球化趋势,使得企业技术创新更多地将依赖于网络组织,技术创新活动的相互依赖性大大增加。一方面以市场价格为主的协调机制存在明显不足;另一方面以契约为主的协调机制因合同的不完全性而难以奏效。本文认为,企业技术创新的网络化治理的目的是促进网络参与者对技术创新网络的专用性投资并维护其完整性,从而提升增强企业的竞争力