区域水资源承载力模糊线性规划模型及应用

首先按照联合国教科文组织提出的资源承载力定义,给出水资源承载力的定义,建立了水资源承载力的模糊线性规划模型,然后运用这模型对江西省的近期水资源承载力问题进行研究,数据结果表明模型的应用是成功的.     

Caloric properties of dilute nonelectrolyte solutions: A success story

Selected aspects of the thermodynamics of very dilute solutions of gases in liquids, in particular aqueous solutions, are reviewed and connected with recent high-precision experimental techniques [vapor-liquid equilibrium measurements (VLE), calorimetry and densimetry]. Some of the problems encountered in data reduction and data correlation over large temperature ranges, including the critical region, are discussed. The focus is on caloric properties, such as partial molar enthalpy changes on solution, ΔH^∞₂, and partial molar heat capacity changes on solution, ΔC^∞_P,2: direct calorimetric methods are compared with indirect methods based on VLE studies as a function of temperature (van't Hoff approach).     

Storage capacity of a dam with gamma type inputs

Summary Consider mutually independent inputsX ₁,...,X _n onn different occasions into a dam or storage facility. The total input isY=X ₁+...+X _n. This sum is a basic quantity in many types of stochastic process problems. The distribution ofY and other aspects connected withY are studied by different authors when the inputs are independently and identically distributed exponential or gamma random variables. In this article explicit exact expressions for the density ofY are given whenX ₁,...,X _n are independent gamma distributed variables with different parameters. The exact density is written as a finite sum, in terms of zonal polynomials and in terms of confluent hypergeometric functions. Approximations whenn is large and asymptotic results are also given.     

Economic evaluation for the optimal introduction of flexible manufacturing technology under rivalry

Unless procedures for the economic evaluation of flexible manufacturing technology are revamped, much of U.S. industry could repeat the experience of American automobile and steel companies from the recent past. The dynamic character of flexible manufacturing technology in terms of associated developments in microelectronics, a trend toward equipment modularity, and the increasing diversity of relevant markets make flexible manufacturing especially vulnerable to the weaknesses of conventional procedures for the justification of capital expenditures. Building on the work of V. Smith, M.I. Kamien and N.L. Schwartz, this paper presents optimization models from which economically reasonable plans can be derived for the implementation of flexible manufacturing technology. Although the assumptions of these models are not focused on the situation of a specific plant, model implications and the overall perspectives here on the economic evaluation of flexible system options should provide general guidance for manufacturing planners.     

粘虫（Mythimna Separata实验种群生殖力表的研究

本文以粘虫为实验材料,在3个温度和同一相对湿度条件下,组建了粘虫实验种群生殖力表。应用3种方法分别求得各统计量的值如下。 内禀增长能力:18℃下为0.0668/每日;25℃下为0.1256/每日;30℃下为0.1272/每日。 周限增长率:18℃下为1.069/每日;25℃下为1.135/每日;30℃下为1.136/每日。 净增殖率:18℃下为309.792/每日,25℃下为319.876/每日;30℃下为134.211/每日。     

"三点式"过程教学的课堂探讨

"知识--活动--能力"是过程教学的三点式,它是学生习得的基础知识,经过教师指导下的学生活动,在活动中转化为学生的能力.本文以<同分异构体>的课堂教学为例,剖析"三点式"的课堂过程教学.     

浅谈电化教学与智能培养

开发智力,培养能力是当今教育的核心,要加快实现这一目标,离不开现代化的教学手段.本文就电化教学的特点及影响智能的诸多因素,从六个方面集中阐述电化教学对智能培养的积极作用.     

线性循环细胞自动机的动态分析

本文利用线性循环细胞自动机的线性循环特性,把自动机问题归结为有限环R=F_■[x]/(x~■-1)中的一些纯粹代数问题.即用中国剩余定理,把环R 分解成一些子环的直和.然后将与这些子环相对应的小自动机的功态特性合成为原来自动机的动态特性.     

自然数前n项幂的和及其分解性质

本文给出由S_K(n)=1~K 2~K … n~K,K=1,2,…的求和公式,得出S_K 1(n)的求和公式的简单方法,此法可顺便得出下一个伯努利数B_K 1。利用这个方法求出了1≤K≤41次幂的等幂和公式(按n的幂排列),以及B_(2K),K=1,2,…,20。另外,本文还给出S_K(n)的分解性质和S_K(n)分解的形式。     

Heat loss corrections for heat capacity flow calorimeters

A single equation describes all linear thermal models for the heat losses in heat capacity flow calorimeters. This equation is used to correct for heat losses by extrapolating the apparent heat capacity to the zero value of a modified reciprocal flow rate. The method, which does not require an auxiliary pump, has been successfully tested for aqueous sodium chloride solutions to 300.8°C, with the derived apparent molar heat capacities being in agreement with literature values. Aqueous solutions of 2-methylpropan-2-ol (t-butanol) gave anomalous results requiring further investigation. Two other correction methods are both consistent with the new method but apply less generally and require care in the evaluation of the correction factors.