交叉口交通信号配时模拟退火全局优化算法

针对我国城市道路交叉口的交通流特性,提出交叉口交通信号配时的模拟退火全局优化算法。     

丙烯酸—丙烯酰胺反相乳液共聚合反应动力学研究

以Ｓｐａｎ８０／ｔｗｅｅｎ８０为乳化剂（ＨＬＢ＝６．４４）、Ｋ２Ｓ２Ｏ８为引发剂、甲苯为油相,研究了丙烯酸－丙烯酰胺反相乳液共聚合反应动力学。     

A recursive method for phase retrieval in Fourier transform domain

In terms of the cascading property and additivity of the order of the fractional Fourier transform, a new recursive algorithm is presented to implement phase retrieval from intensity measurements in the Fourier transform domain. This approach simplifies significantly computational manipulations compared with conventional iterative algorithms.     

A spectral model based on atmospheric self-memorization principle

Based on the atmospheric self-memorization principle, a complex memory function was introduced and the spectral form of atmospheric self-memorial equation was derived. Setting up and solving the equation constitute a new approach of the numerical weather prediction. Using the spectral model T42L9 as a dynamic kernel, a global self-memorial T42 model (SMT42) was established, with which twelve cases of 30-d integration experiments were carried out. Compared with the T42L9, the SMT42 is much better in 500 hPa forecast not only for daily circulation but also for monthly mean circulation. The anomaly correlation coefficient (ACC) of forecast for monthly mean circulation has been improved to 0.42, increased by 0.05, and the root-mean-square error (RMSE) has been reduced from 6.09 to 4.03 dagpm.     

Comparison between varietal purity and zymogram purity in maize

The zymogram purity of 5 inbred lines, 7 single cross hybrids and 7 single cross hybrids mixed with their parental lines was examined by a vertical discontinous polyacrylamide gel electrophoresis. Results indicate that the maize hybrid impurity is mainly composed of three parts:mixed with the seeds from parents or other source, contaminated with the seeds resulting from unknown pollination and variable in genetic background. It was found that the varietal purity is higher than the zymogram purity and they showed a linear relationship. The regression mefficient (γ) between varietal purity and zymogram purity is 0.898 2. There is an average of 3.5 % variable in the field. However, using a known rate of the mixed seeds, their regression mefficient is 0.999 9. It was also found that the examinational mix rate is 0.33% higher than the known mix rate. The seedling rate of the single cross hybrids is 85.71 %, but that of hybrids mixed with their parental lines is only 77%. Therefore, it is reasonable to claim that zymogram purity is lower than the varietal purity.     

Microdissection and amplification of the chromosome arm 5S in a rice telo-tetrasomic

The rice aneuploids with telochromosomes are ideal genetic stocks for chromosome arm identification and microdissection. A rice telo-tetrasomic line with two extra short arms of chromosome 5 (5S) was used in the present study. The amrs of 5S were microdissected from the prometaphase cells in mitosis and amplified with linker adaptor PCR (LA-PCR). The amplified fmgments, ranging from 200–3000 bp, were confirmed to be from the rice chromosome arm 5S by the rice STS and miamatellite markers.     

邻苯二甲酸二丁酯的简便合成方法

在亚硫酰氯存在下,邻苯二甲酸与丁醇反应,高产率生成邻苯二甲酸二丁酯．与经典方法相比,该法具有操作简便,反应时间短,产率高等优点．     

硫酸亚铁剂量计在辐射加工中的应用研究

用硫酸亚铁剂量计对６．６×１０１５Ｂｑ６０Ｃｏγ辐照装置辐射场各项剂量学参数进行了准确测量。用剂量计跟踪测量了大蒜等辐照产品的吸收剂量及剂量分布。对７５１紫外分光光度计进行了校准,测定了该仪器摩尔吸光系数,并使剂量计标准化。     

匈牙利田鼠视交叉上核的研究

哺乳动物下丘脑的视交叉上核控制着多种生理节奏的发生,田鼠是一种营地下生活的独特的啮齿动物,用免疫组织化学,辣根过氧化物酶法和Ｎｉｓｓｌｅ染色法做了其ＳＣＮ形态上的一些研究。     

湖泊水环境中湖流及其风效应研究

在不规则的三角形网格上,采用改型特征线法处理对流算子;采用集中质量的有限元法处理扩散算子,应用数值求解对流扩散方程的分步杂交法,模拟浅水型湖泊的水力特性,计算了1993年三个季度在不同风应力及入出流作用下的流态、流场分布、水位变化情况．