新疆锡伯族与哈萨克族间3个STR位点的多态性比较

分别获得CSF1PO,TPOX和TH013个短串联重复序列STR,对新疆锡伯族和哈萨克族人群中等位基因频率、基因型频率及相关法医学数据进行比较。应用PCR技术、4%变性聚丙烯酰胺凝胶电泳及银染技术对上述3个STR位点分型。锡伯族人群CSF1PO位点有9个等位片段,TPOX位点有8个等位片段,TH01位点有8个等位片段;哈萨克族人群CSF1PO位点有8个等位片段,TPOX位点有8个等位片段,TH01位点有7个等位片段,两民族各自的3个STR位点的基因型分布均符合Hardy-Weinberg平衡;锡伯族人群各位点杂合度分别为0.9426,0.8361,0.8853,多态信息量分别为0.8298,0.7213,0.7626;哈萨克族人群各位点杂合度分别为0.8753,0.8777,0.9321,多态信息量分别为0.7401,0.7568,0.7509。以上3个STR位点的基因频率分布在两个不同的人群中具有显著的差异。     

差分Turbo-OFDM在短波数据通信中的应用研究

该文提出了将Turbo码与OFDM调制、差分检测技术相结合，分析了这种差分Turbo-OFDM体制在短波数据通信中的应用可能。该体制具有较高的频率利用率，可有效地抑制短波信道中多径时延、频率选择性衰落、人为干扰与噪声带来的不利影响。仿真结果显示该体制提高了短波信道上数据通信的误码性能。     

高频窄脉冲电解加工的机理研究

探讨了高频窄脉冲电解加工（HSPECM）的机理。结果表明：HSPECM的强脉冲效应，改善了电解加工极间的间隙特性；强压力波，大脉冲间反向电流以及微火花均产生强烈的去极化作用，改善了电流效率特性，缩小了加工截止间隙，这些均强化了阳极溶解的集中蚀除能力，并实现了微小间隙加工。工艺试验证明，上述变化可导致高加工精度，高表面质量和高效率。用HSPECM加工的型腔试件其圆度达到0.02mm，重复精度在0.05mm以内，表面粗糙度在Ra0.60μm以下，使电解加工从半精加工水平提高到了精加工水平。     

径向滑动轴承中流体从层流到紊流的流动分析和转变判据研究

本文推导了有限长圆柱轴承油膜流体流动的约束方程和固壁上的压力边条,用原始变量法直接求解了三维完全的N-S方程,计算分析了有限长圆柱轴承中油膜层流失稳的临界Taylor数、流场、压力场和摩擦阻力,并通过实验对临界Taylor数进行了验证,结果表明,在有限长轴承中,随着转速的提高,摩擦阻力线性增加,层流失稳出现的涡动将增加摩擦阻力,随着偏心率的增加,层流失稳的临界转速将提高.     

陕北长6油层组短期基准面旋回与储层非均质性的关系

鄂尔多斯盆地上三叠统延长组长６油层组为一套砂、泥薄互层的组合类型,储层非均质性很强,尤以层间的非均质性最为严重,明显受基准面升、降,和可容纳空间及沉积物供给量的变化影响。通过高分辨率层序地层的短期基准面升、降旋回过程与储集物性关系的分析,建立了６种不同沉积微相的非均质性模式,探讨了向上变深、向上变浅的非对称型和向上变深后复变浅的对称型短期基准面旋回层序对储层非均质性特征的控制作用     

鞍山市青少年活动中心裙楼结构设计及体会

通过一个工程实例,介绍高层建筑框架结构设计中遇到的工程问题的处理方法     

Respective roles of short-and long-range interactions in protein folding

A new method was presented to discuss the respective roles of short- and long-range interactions in protein folding. It‘s based on an off-lattice model, which is also being called as toy model. Simulated annealing algorithm was used to search its native conformation. When it is applied to analysis proteins lagt and laho, we find that helical segment catmot fold into native conformation without the influence of long-range interactions. That‘s to say that long-range interactions are the main determinants in protein folding.     

The use of monthly indicators to forecast quarterly GDP in the short run: an application to the G7 countries

The delayed release of the National Account data for GDP is an impediment to the early understanding of the economic situation. In the short run, this information gap may be at least partially eliminated by bridge models (BM) which exploit the information content of timely updated monthly indicators. In this paper we examine the forecasting ability of BM for GDP growth in the G7 countries and compare their performance to that of univariate and multivariate statistical benchmark models. We run four alternative one‐quarter‐ahead forecasting experiments to assess BM performance in situations as close as possible to the actual forecasting activity. BM are estimated for GDP both for single countries (USA, Japan, Germany, France, UK, Italy and Canada), and area‐wide (G7, European Union, and Euro area). BM forecasting ability is always superior to that of benchmark models, provided that at least some monthly indicator data are available over the forecasting horizon. Copyright © 2007 John Wiley & Sons, Ltd.     

无人值守设备远程无线监测系统设计

阐述了以GSM网络为平台,利用SMS短消息技术实现对无人值守设备的远程无线监测.同时,提出了一种以Internet网络为依托,实现WEB网页数据发布的通信模式.介绍了系统组成、结构设计及其软硬件实现.其设计方法具有一定的通用性和先进性,可广泛应用于各领域的无人监测系统中.     

基于单位阵的循环移位构造LDPC码的研究

高码率LDPC码的性能研究正日益受到信道编码界的关注，在许多带宽受限的信道环境下提高码率是提高信息传输速率的有效途径之一．这里通过对基于单位阵的循环移位矩阵构造LDPC码方法的研究，从理论上系统分析了此种构造方法．仿真结果表明，该LDPC码的构造方法能有效规避指定长度环，并在高码率下具有很好的编译码性能．