三维无限深方势阱能级简并度与对称性关系的讨论

本文详细讨论了量子力学的一个重要特例——三维无限深方势阱的能级简并度的特点及简并度与对称性之间的关系.通过分析得到了重要结论.并指出了与氢原子和谐振子体系的区别.     

预警机远距引导歼击机的误差分析和引导效能

为定量分析和评估预警机对歼击机的远距引导效能,以远距引导成功概率作为引导效能指标,模拟预警机远距引导歼击机过程并进行分析和建模。将歼击机的远距引导分解为水平引导和垂直引导,按照平行接近法引导规则,建立水平和垂直引导误差分析模型,利用概率分析方法推导了远距引导效能公式,获得预警机引导误差、机载雷达性能、目标机特性等因素与远距引导效能之间的关系。最后以预警机远距引导某型歼击机拦截目标机为例,在载机速度低于超音速目标的场景下,分析了目标进入角、截获距离、天线扫描范围、目标参数测量精度等主要因素对远距引导概率的影响规律,并根据仿真计算结果,分析讨论了在此场景下提高远距引导效能的有效途径。     

A genetic variation map for chicken with 2.8 million single-nucleotide polymorphisms

We describe a genetic variation map for the chicken genome containing 2.8 million single-nucleotide polymorphisms (SNPs). This map is based on a comparison of the sequences of three domestic chicken breeds (a broiler, a layer and a Chinese silkie) with that of their wild ancestor, red jungle fowl. Subsequent experiments indicate that at least 90% of the variant sites are true SNPs, and at least 70% are common SNPs that segregate in many domestic breeds. Mean nucleotide diversity is about five SNPs per kilobase for almost every possible comparison between red jungle fowl and domestic lines, between two different domestic lines, and within domestic lines--in contrast to the notion that domestic animals are highly inbred relative to their wild ancestors. In fact, most of the SNPs originated before domestication, and there is little evidence of selective sweeps for adaptive alleles on length scales greater than 100 kilobases.     

锥形床亲和层析过程的场协同分析

为了对亲和层析过程的强化提供理论依据,应用非平衡热力学唯象理论,分析了该过程中温度场、化学势场及重力场等各种场之间的协同关系,以及各自场内不同分量之间的协同关系.得到了亲和层析过程的总熵变表达式,多场协同条件下质量通量和热量通量的唯象表达式以及相应的传质和传热系数.分析结果表明:重力场的存在,维持了体系的非平衡状态、保证了锥形床的稳定操作,避免了柱子堵塞及压密化.上流锥形床亲和层析在多场协同下,其传质、传热以及吸附反应相互影响,过程的最终传递方向将取决于各场之间综合作用的结果.     

案例教学在现代物流教学上的应用

本文介绍了案例教学法的概念和特点,阐明了在现代物流教学中引入案例教学法的必要性,指出把握知识点、收集案例、分析案例及总结,是现代物流案例教学的关键环节。     

大孔膦酸树脂对铽的吸附性能研究

就大孔膦酸树脂(简称PAR)对铽(Ⅲ)的吸附性能进行了研究.实验选在pH为5.6的HAc-NaAc缓冲体系中进行.在实验条件下,树脂吸附铽离子的吸附速率随铽离子质量浓度的增大而增大,随温度的升高而增大,随振荡频率的增大而增大,随树脂粒径的减小而增大.     

信息隐藏与数字水印的研究及发展

随着Internet和多媒体技术的飞速发展，多媒体通信成为人们进行信息交流的重要手段，信息的安全和保密显得越来越重要，促进了多媒体信息、图像信息和声音信息的加密研究。信息安全技术越来越重要，成为大家研究的一个重要课题。主要介绍信息隐藏和数字水印技术的关系，各自的原理、模型、特点、分类、方法及其应用领域等内客。     

Population information extraction in Chaohu watershed based on RS and GIS

It is always difficult to extract population information of small watershed during the region environment assessment.The report adopted compound areal interpolation to study the population in Chaohu watershed with the GIS technique and landuse interpretation data from remote sensing.The result indicated that the method is effective to extract population information of small watershed.     

辣椒的离体再生及抗虫基因转化的研究

研究建立起一套简单、高效的辣椒遗传转化系统。利用根癌农杆菌介导带柄子叶,将豇豆胰蛋白酶抑制剂（CpTI)基因转入辣椒栽培品种“益都羊角椒”中。对获得的33株卡那霉素（Km)抗性植物进行PCR检测,证明有6株为转CpTI基因植株。通过对转基因植株进行抗虫性研究,发现R1代植株对棉铃虫表达出一定的抗性,但不同转化体之间其抗性存在着差异。     

U-Pb dating of zircon grains from the ore-bearing plagioclase amphibolite in the Dashuigou Te deposit

The Dashuigou Te deposit is a unique independent one found in the world, and hosted in the plagioclase arnphibolite. The upper intercept age of single zircon from the arnphibolite can be considered to be the crystallization age of the source-rock of the amphibolite (tholeiitic basalt), while the lower intercept is nearly consistent with the time of the tectono-thermal event.