一类典型非线性需求下二度价格歧视的研究

对一类典型非线性需求函数条件下垄断厂商实施二度价格歧视的方法、程度和特点给出了较为系统的研究。     

健美操形体训练与降脂的初探

运用实验方法对重庆市某健身俱乐部A、B两组学员进行不同内容的健身实验，实验组在每次有氧健身操之前增加对身体各部位的器械训练，结果表明：实验组减脂量明显高于对照组。同时还能培养人们自觉锻炼身体的习惯，增强体质，塑造美好形体。     

Novel l_2-l_∞ controller design for LPV discrete time-delay systems

1.INTRODUCTION Manyreal worldsystemscanbemodeledaslinearpa rameter varying(LPV)systems[1],whosestate spacerepresentationmatricesarefunctionsofasetof parametersthataremeasurableinrealtime.Recent ly,manyresearchersathomeandabroadhavebeen engagedinthestabilityanalysisandgainscheduling controlofLPVsystemsextensivelyandagreatnum berofimportantresultshavebeenreportedinthelit erature(see,forinstance,Refs.[1～7]andtheref erencestherein).Mostoftheseresultsfocusoncon tinuous timecases,while…     

Composite interval mapping of QTL for dynamic traits

The theoretical foundation for mapping quantitative trait loci (QTL) was laid by Sax[1] who discovered the association between the segregation pattern of pigment markers with seed size of bean. However, statistical methods were not well developed until th…     

A new way of transformation from a-quartz to coesite

A laboratory method combining the high-energy mechanical ball milling and high static pressure has been suggested for modelling synthesis of coesite in the Earth's crust. A window of milling time, a mechanical collision-induced intermediate phase ofα-quartz and its condition of easily crystallizing into coesite under the condition of 3.0 GPa, 923 K, < 1.0 min have been discovered. The new method needs much shorter synthesizing time and lower synthesizing critical pressure than those used before. The Raman spectra for the coesite synthesized by the present method have covered all the information of those natural and synthesized coesites reported before. It is demonstrated that this method has a great potential in geo-science research and implied the other possible mechanism of coesite formation in the Earth's crust.     

蔗糖酯合成新方法的研究

本法以苛性钾与脂肪酸钾（乙）酯首先反应生成的部分中性皂作为乳化分散剂，使蔗糖和脂肪酸甲（乙）酯在熔融状态下直接发生酯交换反应合成蔗糖酯。     

水基热分解法制备钛酸铅系薄膜

采用水基热分解法在ＳｉＯ２／Ｓｉ基底上制备了钛酸铅和掺镧钛酸铅铁电薄膜。详细研究了以水为溶剂，将铅盐和钛醇盐等直接加入到溶剂中制成先体溶液，测量溶液的ＤＴＡ－ＴＧＡ曲线和透光率曲线；对薄膜作ＸＲＤ和ＳＥＭ分析，并对其结果进行了简要讨论了测量了室温下薄膜介电性能和铁电性能。     

振动系统非线性特性的神经网络识别法

本文介绍了振动系统非线性特性识别的一种结构化神经网络方法，与标准的前馈网络融进了人们对系统的已知认识，神经网络仅仅用来学习未知部分，本文将其应用于振动系统非线性特性的识别，结果表明该法是可行的。     

关于熵函数导出方法的研究——Carnot循环导出法的改进

对现行教材中熵函数的传统导出方法进行了评述，指出成为难点的原因是：冗长的推导，否定性的叙述使学生不适应；数学抽象的逻辑思维使学生不习惯以及讲授时没能紧扣热二律的律文。在此基础上，提出处理这段教材的改进措施，并进一步提出对熵函数导出方法的根本性的变动，归纳为七种导出法。     

多波长同时测定食品中4种合成色素

本文研究了紫外分光光度法多波长同时测定食品中合成色素的最佳测试条件,确定了各色素在该测试系统中的最佳波长。测定了各色素在不同波长的百分比浓度吸光系数,方法变异系数为:3.09％～6.62％,回收率为:96.4％～104.2％。