浅议政府投资建设项目代建制管理模式

文章通过综述目前国内外的最新研究成果,认为骨骼肌纤维类型之间可以实现相互转变,可能与运动神经元的活动、运动神经的化学营养性作用、基因改变以及相关代谢酶活性的选择性增强等因素有关.     

Estimation of wind erosion rates by using 137Cs tracing technique: A case study in Tariat-Xilin Gol transect, Mongolian Plateau

Wind erosion is one of the major environmental problems in semi-arid and arid regions. Here we established the Tariat-Xilin Gol transect from northwest to southeast across the Mongolian Plateau, and selected seven sampling sites along the transect. We then estimated the soil wind erosion rates by using the 137Cs tracing technique and examined their spatial dynamics. Our results showed that the 137Cs inventories of sampling sites ranged from 265.63=44.91 to 1279.54=166.53 Bq. m-2, and the wind erosion rates varied from 64.58 to 419.63 t. km-2. a-~ accordingly. In the Mongolia section of the transect （from Tariat to Sainshand）, the wind erosion rate increased gradually with vegetation type and climatic regimes; the wind erosion process was controlled by physical factors such as annual precipitation and vegetation coverage, etc., and the impact of human activities was negligible. While in the China section of the transect （Inner Mongolia）, the wind erosion rates of Xilin Hot and Zhengxiangbai Banner were thrice as much as those of Bayannur of Mongolia, although these three sites were all dominated by typical steppe. Besides the physical factors, higher population density and livestock carrying level should be responsible for the higher wind erosion rates in these two regions of Inner Mongolia.     

视频移动侦测技术在城市交通管理中的应用

针对城市交通管理中的交通红绿灯计算机监控系统采用地埋感应线圈来识别红灯禁行区车辆的缺陷,描述在该计算机监控系统中如何采用视频移动侦测技术(VMD),取代地埋感应线圈来识别道路红灯禁区中行使的车辆,减少安置地埋线圈时对路面造成的损坏.分析应用该技术的可行性,硬件的可实现性.阐述如何通过计算机程序荻取摄相机自动抓拍的交通红绿灯路口上行驶的机动车的违章行使照片和道路交通状况信息的方法.     

Thermal conductivity measurement of InGaAs/InGaAsP superlattice thin films

The thermal conductivities of InGaAs/ InGaAsP superlattices with different period lengths were measured from 100 to 320 K using 3ω method. In this temperature range, the thermal conductivities were found to decrease with an increase in temperature. For the period length-dependant thermal conductivity, the minimum value does exist at a certain period length, which demonstrates that at a short period length, superlattice thermal conductivity increases with a decrease in the period length. When the period is longer than a certain period length, the interface thermal resistance dominates in phonon transport. The experimental and theoretical results confirmed the previous predictions from the lattice dynamics analysis, i.e. with the increase in period length, the dominant mechanisms of phonon transport in superlattices will shift from wave mode to particle mode. This is crucial for the cutoff of the phonons and lays a sound foundation for the design of superlattice structures.     

对乙烯基苯磺酸钠接枝聚丙烯纤维

利用超声波的分散原理,以二甲苯作为界面剂,把引发剂过氧化苯甲酰(BPO)分散到聚丙烯(PP)纤维表层里,然后在水溶液中接枝对乙烯基苯磺酸钠(VSB),得到接枝产物PP-g-VSB纤维．研究反应条件对接枝率的影响,以及接枝率对接枝纤维性能的影响,并用热重分析加以表征．结果表明,反应温度为90℃、VSB和 BPO质量分数分别为8％,4％,可得到接枝率34％、离子交换当量1．2 mmol·g-1的强酸型离子交换纤维．     

电荷与电流体系能量的非线性叠加

本文根据场能公式和利用场强线性叠加原理,严格证明电荷体系能量的非线性叠加;并给出能量叠加的数学形式。     

Co/ZnO颗粒膜的超顺磁性研究

对金属颗粒与氧化物半导体颗粒膜的超顺磁特性用Ｌａｎｇｅｖｉｎ函数进行了拟和，理论与实验结果符合的较好，同时分析了样品的磁矩随退火温度的变化关系。     

采用光流场运动估计的双树复小波域视频水印算法

提出一种基于光流场的双树复小波变换(DT-CWT)的数字水印算法.首先利用光流信息检测出视频序列的关键帧,然后利用光流场技术对选取的关键帧进行局部区域的运动估计.最后,根据人眼对快速流动物体敏感性弱的特点,将水印信号分块嵌入关键帧内快速运动区域.测试结果表明:该算法具有很好的不可见特性,在面对噪声、缩放等恶意攻击时也具有很好的稳定性,同时也具有很好的实时性.     

某些烧结锆刚玉材料剥落损坏现象分析

通过对材料及其剥落产物的显微结构、晶相组成和化学组成分析,发现剥落是由于材料的制造过程未生成应有的氧化锆与莫来石晶相,而残余的大量锆英石在含碱环境中分解而造成的。     

种子园樟子松疱锈病病原及转主的研究

报道了大兴安岭地区种子园樟子松疱锈病发生的严重危害.通过林间调查和室内人工接种试验结果,引起该病害的病原菌为松芍柱锈菌,其转主寄主也只有芍药一种.