一种新的反馈式流媒体拥塞控制算法

参考基于反馈的流媒体拥塞控制算法FCA基础之上,从减少系统抖动入手,提出了一种新的基于反馈的流媒体拥塞控制算法。仿真实验结果表明,NFCA算法在延时抖动有所改进,更适合流媒体的传输。     

新疆不同民族大学生神经类型与适宜运动项目的相关研究

为了了解新疆汉族、维吾尔族、哈萨克族、蒙古族、柯尔克孜族、锡伯族大学生神经类型的民族特征,以及民族间性格、气质的差异,采用艾森克问卷法进行了516名大学生的运动心理指标测试调查与对比分析.所取得的分析资料将为研究各少数民族大学生的心理特征提供参考依据;也为各民族运动员的选材提供参考依据.     

城市人口迁移的网络特征

以中国东北地区城市人口数据和城市人口迁移的引力模型为基础,建立了城市网络,并利用复杂网络的理论和研究成果,分析了城市人口迁移的网络特征,发现城市网络具有典型复杂网络的无尺度特性,人口与城市的关系如同Internet的网络流量与节点之间的关系,城市人口的迁移具有偏好依附特性,给出了偏好依附的模型.同时对东北地区城市网络中节点的度分布进行了研究,依据各城市在网络的节点度情况,预测了东北地区未来发展的情况.     

基于自对偶测度的Choquet积分

提出了自对偶测度的定义,讨论了自对偶测度的简单性质,给出了基于自对偶测度的Choquet积分的定义,并讨论了该积分的基本性质.     

基于政策过程的我国荒漠化治理研究述评

自20世纪70年代被确立为一项全球性议题以来,荒漠化治理就从地方行为上升为世界各国的共识性政策话语.荒漠化是一个复杂的土地退化过程,一直以来学者们的重点是基于物理、化学和生物视角的水土保持与土地退化防治研究,而政策层面的研究较为少见.围绕荒漠化治理政策执行过程中呈现出的政策稳定和政策变迁两种取向,发现政府政策工具的运用...     

The yak genome and adaptation to life at high altitude

Domestic yaks (Bos grunniens) provide meat and other necessities for Tibetans living at high altitude on the Qinghai-Tibetan Plateau and in adjacent regions. Comparison between yak and the closely related low-altitude cattle (Bos taurus) is informative in studying animal adaptation to high altitude. Here, we present the draft genome sequence of a female domestic yak generated using Illumina-based technology at 65-fold coverage. Genomic comparisons between yak and cattle identify an expansion in yak of gene families related to sensory perception and energy metabolism, as well as an enrichment of protein domains involved in sensing the extracellular environment and hypoxic stress. Positively selected and rapidly evolving genes in the yak lineage are also found to be significantly enriched in functional categories and pathways related to hypoxia and nutrition metabolism. These findings may have important implications for understanding adaptation to high altitude in other animal species and for hypoxia-related diseases in humans.     

Nuclear reprogramming of cloned embryos and its implications for therapeutic cloning

Therapeutic cloning, whereby somatic cell nuclear transfer (SCNT) is used to generate patient-specific embryonic stem cells (ESCs) from blastocysts cloned by nuclear transfer (ntESCs), holds great promise for the treatment of many human diseases. ntESCs have been derived in mice and cattle, but thus far there are no credible reports of human ntESCs. Here we review the recent literature on nuclear reprogramming by SCNT, including studies of gene expression, DNA methylation, chromatin remodeling, genomic imprinting and X chromosome inactivation. Reprogramming of genes expressed in the inner cell mass, from which ntESCs are derived, seems to be highly efficient. Defects in the extraembryonic lineage are probably the major cause of the low success rate of reproductive cloning but are not expected to affect the derivation of ntESCs. We remain optimistic that human therapeutic cloning is achievable and that the derivation of patient-specific ntESC lines will have great potential for regenerative medicine.     

中性点非有效接地系统单相接地故障仿真分析

为了提取小电流接地系统单相接地时故障线路和非故障线路的零模暂态能量值,利用电磁暂态程序ATP建立了仿真模型,借助Matlab程序设计得到了相应的零模暂态能量值.同时综合考虑不同接地过渡电阻、不同故障距离、不同故障初相角以及间歇性接地故障等多个因素,对小电流接地系统的单相接地故障进行了大量仿真.仿真分析结果表明:基于零模暂态能量的故障选线方法检测灵敏度高,不仅适用于中性点不接地系统,而且适用于中性点经消弧线圈接地系统及间歇性接地故障.     

用可持续发展度来预测评价通化地区的钢铁工业

根据有关政策、法规和通化地区生态环境及经济结构等因素,选择5类4层24项指标,构成通化地区可持续发展度指标体系.采用专家评分方法,建立层次加权组合法的多指标综合测算模型,预测评价通化地区钢铁工业对生态环境和社会经济的影响,并对2010年和2020年通化地区可持续发展度给出了定量评价,验证各项指标的合理性.     

青洲闽江大桥的抖振分析及风载内力计算

青洲闽江是位于强风地区的一座大跨结合梁斜拉桥,据此较详细地分析了青洲桥设计方案和增设气动外形措施后的风致抖振响应,计算了风荷荷载作用下在结构中产生的动内力和静风内力。