Pole assignment for systems over rings

A very simple proof of the pole assignment theorem for systems over a principal ideal domain (and other rings) is given. Furthermore, an algorithm is presented. Extensions are also indicated.     

Determination of the biological value of a protein source with a supposedly ideal amino acid balance (a.r.c. 1981) for the young pig (10 to 20 kg liveweight)

Fourteen entire-male pigs of 16 kg mean liveweight were given a synthetic diet, the sole protein source of which comprised enzymically hydrolysed casein and free synthetic amino acids. The amino acid balance of the 80 g kg^?1 crude protein diet was formulated to equal the Agricultural Research Council (1981) recommended ideal amino acid balance for the growing pig (20 to 90 kg liveweight). In two separate metabolism trials the biological value (BV) of the diet was estimated to be 0.86±0.012 (n=8) and 0.82±0.025 (n=5), respectively. Both BVs were significantly lower than unity, indicating that this dietary amino acid balance was less than ideal for the young pig.     

基于网络流上的秘密共享体制

给定一个通道结构,使它的极小通道结构对应于一个网络的极小割集族,那么存在一个实现它的理想秘密共享体制。而每一个密钥的子密钥正好构成该网络的一个流,反之亦然。给出的实现这些体制的方法极其有效。     

理想气体体积数据换算问题的计算机处理方法

依据理想气体状态方程,以Visual Basic 6.0语言为工具,开发理想气体体积数据换算的处理程序。该程序占用内存小,使用快捷方便,输入数据能迅速显示计算结果。同时经编译可以生成能够脱离Visual Basic单独运行的可执行程序。     

基于组合赋权TOPSIS法的区域森林火灾易损性研究

通过对区域森林火灾易损性进行评价,实现控制火灾风险和减轻损失。考虑到森林火灾暴露性程度和灾害应对能力等因素,构建了由暴露性程度、恢复性指标、敏感性指标、灾害应对能力4个准则层和16个指标层构成的区域森林火灾易损性评价指标体系。利用组合赋权TOPSIS法对四川省21个市（州）开展了森林火灾易损性评价,根据评估结果将四川省的森林火灾易损性水平划分为5个等级。     

暴雨对梁子湖水动力和水质的影响研究

为了分析在暴雨条件下,流域面源污染对梁子湖水质的影响,采用分布式流域面源污染模型,结合湖泊二维水动力水质模型,以暴雨产生的面源径流和污染负荷作为水动力水质模型的边界条件,构建了包含暴雨径流-面源模型与二维水动力水质模型的梁子湖水质模型体系。采用梁子湖水质的实测资料对模型进行了验证,其结果为面源模型的误差在15%以内,水质模型误差在20%以内,表明模型能模拟暴雨条件下面源径流和入湖污染物输入时湖泊水动力及水质的动态响应关系。以2010年7月11日暴雨过程为例,利用所建模型对暴雨前后梁子湖水质变化进行分析。模拟结果表明,水质受暴雨及污染物的冲击影响较大。     

Disturbance observer design with Bode’s ideal cut-off filter in hard-disc-drive servo system

In order to improve the disturbance compensation performance under vibrations in hard-disc-drive servo system, Bode’s ideal cut-off (BICO) filter is applied for the disturbance observer (DOB) design. New DOB is designed with BICO low pass filter (LPF) substituting the normal LPF in the original DOB design. With this BICO LPF, the new DOB can achieve strengthened attenuation of error sensitivity in disturbance frequency range to obtain better disturbance compensation performance while maintaining the robust specifications. This benefit comes from the less phase loss property of the BICO filter. Meanwhile, the BICO filter with the property of sharp roll-off magnitude is applied for the disturbance frequency range detection filter design. Using this BICO identification filter, multiple-DOB control can be used for the disturbance compensation based on the switching according to the disturbance detection. Industrial drive level experimental results are included to validate the proposed new DOB scheme under vibration.     

基于低冲击开发技术下城市暴雨内涝灾害的控制

低冲击开发技术是指采用源头截流、储存、渗滤以及蒸发雨水,最大程度保护及开发改造地区的水文情势,减少负面环境影响,控制与利用的一种雨水管理方法.论文简要概括了低冲击开发技术的研究进展,并重点探讨了低冲击开发技术在防御城市暴雨内涝灾害的应用.     

基于Vague交叉熵的Topsis产品方案优选方法

产品的设计方案优选是个复杂的多准则团队协同决策过程。为解决产品设计方案优选中多准则间的关联被忽视的问题,提出一种改进的Topsis方法模型,即通过Vague交叉熵建立起多准则下的单个专家评价结果模型,再应用证据推理理论融合各专家的冲突性的评价结果,得到各方案综合评价值,以判断出优解顺序。最后,以共享底盘开发的方案评价与选择作为实例验证了该方法的可行性与有效性。     

Study into the Applicability of Laser Beam Quality Factor M^2

The applicable condition of single-frequency laser beam quality factor M2 is studied. Any real single-frequency laser beam can be classified as Gaussian mode and non-Gaussian mode according to the transverse field distribution. Non-Gaussian transverse field distribution can be analytically expressed as the sum of Hermite-Gaussian functions. The propagation function and M2 factor expression for non-Gaussian mode can be obtained by the second moment definition of laser beam spot. The analytical results show, the same as that of Gaussian mode, that the propagation function follows the hyperbolic law and the value of M2 factor is a constant for non-Gaussian mode. But, different non-Gaussian field distributions may have the same M2 value. That means M2 factor cannot reflect the quality of non-Gaussian laser beams correctly. We conclude that the M2 factor is applicable only to ideal Gaussian laser beam generated by stable resonators.