Comb-shaped circularly polarised dielectric resonator antenna

A new shaped circularly polarised dielectric resonator antenna is proposed. This antenna, compared to some previous investigations, is easier to implement, free from a complicated feed network and offers wider axial ratio bandwidth. About 4% AR bandwidth (<3 dB) with S/sub 11/<-10 dB and 3.5 dBi peak gain is reported.     

Ne^3P0,2）与乙腈的能量转移反应研究

在流动余辉装置上，我们研究了亚稳态原子Ｎｅ（＾３Ｐ０，２）与乙腈的能量转移反应，观察到了ＣＮ（Ａ－Ｘ），ＣＮ（Ｂ－Ｘ），ＣＨ（Ａ－Ｘ）的发射谱。计算了ＣＮ（Ａ，Ｂ）的相对振动粒子数布居，并对该反的机理进行了讨论。     

A pole-assignment algorithm for linear state feedback

A new algorithm for the pole-assignment problem of a controllable time-invariant linear multivariable system with linear state feedback is presented. The resulting feedback matrix is a least-squares solution and is robust in a loose sense. The method is based on the controllability canonical (staircase) form and amounts to a new proof for the existence of a solution of the pole-assignment problem. Illustrative examples are given.     

Hg_(1-x)Cd_xTe反型层子能带结构的实验研究

本文在4.2K下测定了液相外延HgCdTe MIS结构样品的电容谱,磁阻振荡以及迴旋共振效应,并从实验测量结果,采用物理参数拟合法,确定了该样品在电量子限条件下反型层电子子能带结构,包括基态子能带能量E_o、费密能级E_F,子能带电子有效质量m~*(E_F)、m~*(E_o)、反型层平均厚度Z_i、耗尽层厚度Z_d,以及它们随子能带电子浓度N_s的变化。     

锥形双螺杆磨损机理及抗磨技术

本文对锥形双螺杆的磨损机理进行了分析，指出了用于加工木塑复合材料的锥形双螺杆的主要磨损机理是机械疲劳磨损，而螺杆的腐蚀磨损加速了螺杆的机械疲劳磨损。同时，介绍了国内外螺杆的抗磨技术及其在锥形双螺杆中的应用，如合理选材、表面强化、渗氮、喷丸得理和金属镀层等。     

Task response time for real-time distributed systems with resourcecontentions

An analytic model is proposed for estimating task response times in distributed systems with resource contentions. The model consists of two submodels. The first submodel is an extended queuing network model used for approximating module response times. This submodel is solved by a decomposition technique which reduces the computational complexity by two to three orders of magnitude when compared with a direct approach. The second submodel is a weighted control-flow graph model from which task response time can be obtained by aggregating module response time in accordance with the precedence relationships. Task response times estimated by the analytic model compare closely with simulation results. It is shown that resource contention delays depend on the availability of resources as well as on the invocation rates and response times of the modules that use the resources. The model can be used to study the tradeoffs among module assignments, scheduling policies, interprocessor communications, and resource contentions in distributed processing systems     

浅析利用抽芯成果判断深层搅拌桩复合地基承载力

该文以在工程检测中大量抽取搅拌桩水泥土芯样的无侧限抗压强度的实际数据为基础 ,从正确理解文献 [2 ]折减系数与水泥土安全分项系数和搅拌桩安全分项系数的关系 ,提出如何理解搅拌桩的设计意图 ,从而对利用搅拌桩芯样的无侧限抗压强度来判断深层搅拌桩的质量提出了看法 ,并对如何设计深层搅拌桩提出了建议     

光引发合成聚丙烯酰胺在选煤厂的应用

介绍了光引发合成聚丙烯酰胺的方法及在选煤厂的应用,结果表明,由光引发合成聚丙烯酰胺,方法简单,产品分子量高,在选煤厂煤泥水处理中应用效果良好,在相同条件下使用效果超过商品聚丙烯酰胺。     

丝状藻响应温度变化的生长及功能特性

针对近年来丝状蓝藻水华的频繁暴发问题,研究了3种常见丝状藻生长对温度的响应以及生长与功能特性间的关系。结果表明：温度由15℃增加至30℃,拟柱孢藻比生长速率由0.28 d^-1增加为0.70 d^-1,光合活性（F_v/F_m）在0.40~0.61范围内波动,单位藻细胞溶解性总氮（DTN）和溶解性反应磷（SRP）消耗量也分别增加了6.36 mg-DTN/mg-Chl.a、0.15 mg-SRP/mg-Chl.a;伪鱼腥藻比生长速率从0.12 d^-1到0.60 d^-1,F_v/F_m在15℃时达到最低,为0.12,单位藻细胞氮磷消耗量也分别增加了21.72 mg-DTN/mg-Chl.a、1.71 mg-SRP/mg-Chl.a;水华束丝藻比生长速率从0.20 d^-1到0.44 d^-1,F_v/F_m受影响较小,单位藻细胞氮磷消耗量也分别增加了12.29 mg-DTN/mg-Chl.a、0.83 mg-SRP/mg-Chl.a。温度升高都会促进3种丝状藻生长,拟柱孢藻易在大于30℃高温下形成优势;伪鱼腥藻温度适应范围广,但温度低于15℃会抑制伪鱼腥藻生长;水华束丝藻最佳生长温度为25℃,并可在15℃时取得优势,耐低温能力较强。另外,丝状藻可通过权衡藻细胞生理特性以维持不同温度下的生长优势。     

微生物加固路基强度及稳定性

微生物诱导沉积碳酸钙沉积技术(MICP,Microbially Induced Calcite Precipitation)是利用岩土层中的细菌微生物,在人为诱导作用下,生成具有胶结作用的碳酸盐沉淀,附着于岩土层间隙内,用于改善岩土层的强度,增强地基稳定性。利用MICP技术加固福建标准砂,进行不同围压下的三轴试验,结果表明,标准砂加固前后黏聚力的提高值为60.1kPa。利用Plaxis软件模拟高速公路路基加固技术,通过MICP诱导碳酸钙沉淀技术对高速公路路基加固,改变岩土体基本性能,利用强度折减法模拟在MICP技术加固前后路基的强度及稳定性变化,稳定性系数由1.096增大为1.827,高速公路路基经过MICP加固后,稳定性大大提高,边坡破坏面由坡脚移动至坡面。