氮磷钾肥配合施用对甜菜的效应

应用三因素五水平回归最优设计方案，在内蒙河套乌拉特前旗短甜菜产地进行氮磷钾化肥配合施用对甜菜效应的试验，建立了甜菜块根产量、产糖量与施肥量关系的函数效应方程，得出了在当地中等偏上土壤肥力条件下甜菜块根最高产、最高亩产糖的氮磷钾肥配施数量以及块根亩产、亩产糖最佳经济施肥量。     

Preparation and application of high sound insulation polyurethane composite film through glass fiber reinforcement

Laminated glasses have been widely used in buildings, physical protections, and vehicles because of their safety, sound insulation, thermal insulation, and other performance. In recent years, the high sound insulation performance of laminated glass intermediate films in the frequency range of low or high frequencies has attracted more and more attentions. In this work, a glass fiber/polyurethane elastomer composite (PU-MGF) film with high transparency and impact resistance has been successfully synthesized, 5 dB of the transmission loss increased at 1600–6000 Hz, and 3.6 dB increased at 63–1600 Hz compared with the control polyurethane film. This is a significant progress in the laminated glass industry. In addition, the transmittance of the composite reaches over 75%. The excellent impact resistance of the laminated glass, based on PU-MGF film, has been confirmed through falling ball impact test, demonstrating its ability to withstand multiple impacts without spattering. The PU-MGF film prepared in this work exhibits great potential for applications in building windows, transportation, and soundproof devices.     

以欠采样速率实现盲谱感知及二维DOA估计

提出了两种以欠采样率实现盲谱感知与二维波达方向(DOA)估计的算法。这两种算法利用了MWC的周期信号所对应的傅里叶级数系数矩阵来确定未知信号频谱所在的子频带位置,然后利用二维阵列的信号模型估计得到包含二维DOA的空间相位。通过空间相位信息与子频带位置信息能重构出子带谱信息,以此能得到频率的高精度估计,最后通过空间相位分别估计得到信号的方位角与俯仰角。仿真验证了所提欠采样接收机与相应算法的有效性,以及在低信噪比环境下依然有较好的鲁棒性。     

生态染整技术

介绍了生态纺织品的概念和生态纺织品检测标准Oeko-Tex标准100的检测内容,从纺织纤维原料和染整加工方面论述了纺织品加工中存在的生态问题,从原料、前处理、染色、印花和后整理五方面介绍了目前采用的具有创新性和实用性的生态染整加工技术。     

基于Boson NetSim的小型网络虚拟实现

随着互联网的迅猛发展,Cisco路由器在互联网中得到广泛使用,整个英特网中80%的路由器均采用Cisco的产品。该文提出了一种模拟路由器设置方法,并且对其中的关键组成部件如内部网关协议RIP、静态路由设置等功能和实现过程进行了描述。另外,通过输入命令语句来完成端口的设置,以及实现虚拟路由器相互之间的通信。对原型的测试证明所提出的模拟路由器设置在使用中是可行的。     

矩形集成电路半解析热分析软件--BJX热分析软件的研制

半解析热分析法具有解析法的高精度，又具有数值法的较宽适用范围。编制出的计算软件具有分析时间短、操作简便、成本低廉等优点，可能成为下一代集成电路实际使用的热分析软件。     

快速心肌显像剂^99mTc—TEBO的标记和动物体内分布实验

报道了用＾９９ｍＴｃ标记Ｔｅｂｏｒｏｘｉｍｅ（简称ＴＥＢＯ），并在标记后对其质量进行了鉴定。结果表明，其物理性质、化学性质及生物学性质均符合国家制定的放射性药物的质量标准；动物实验表明，小鼠注射量为成人用量的１００倍、观察１５天后，实验组和对照组无差别；注入量为０．１ｍｌ（２０７．２Ｂｑ／只），２ｍｉｎ后心肌摄取达峰值１７．７５±０．３３％（ｇ ｏｒｇａｎ）＾－１；心肌清除也快，１５ｍｉｎ已清除至     

界面聚合法制备包油胶囊

探讨子用界面聚合法制备尼龙包油胶囊的实验条件，研究了不同配料比对胶囊性质的影响，得到制备稳定包油胶囊的最佳实验条件。     

Adaptive moving mesh methods for simulating one‐dimensional groundwater problems with sharp moving fronts

Accurate modelling of groundwater flow and transport with sharp moving fronts often involves high computational cost, when a fixed/uniform mesh is used. In this paper, we investigate the modelling of groundwater problems using a particular adaptive mesh method called the moving mesh partial differential equation approach. With this approach, the mesh is dynamically relocated through a partial differential equation to capture the evolving sharp fronts with a relatively small number of grid points. The mesh movement and physical system modelling are realized by solving the mesh movement and physical partial differential equations alternately. The method is applied to the modelling of a range of groundwater problems, including advection dominated chemical transport and reaction, non‐linear infiltration in soil, and the coupling of density dependent flow and transport. Numerical results demonstrate that sharp moving fronts can be accurately and efficiently captured by the moving mesh approach. Also addressed are important implementation strategies, e.g. the construction of the monitor function based on the interpolation error, control of mesh concentration, and two‐layer mesh movement. Copyright © 2002 John Wiley & Sons, Ltd.