立体组合幻方

解决了8k阶立体组合幻方的理论和构造问题,首次将函数引入了立体组合幻方的构造,设计出8k阶立体组合幻方的函数模型,推导出其和的均等值公式。     

8k阶完美立体组合幻方

以．8．阶完美立体函数幻方为模型，讨论了k为任意自然数时8k阶完善立体组合幻方的构造方法，并给出k=1，2时8阶完美立体幻方和16阶完美立体组合幻方的构造实例。     

P2阶拉丁方与P2阶二次、双重和立体幻方

讨论用同一种模式的P^2(P为奇素数)阶正交拉丁方为数理座标，构造P^2阶二次、双重和立体三种不同幻方的方法，用该方法构造出了当P=3，5时的二次、双重幻方及P=3时的立体幻方，以实例形式给出了部分构造结果。     

4k+2阶幻方的一种构造方法

n阶幻方就是把自然数 1 ,2 ,3 ,… ,n2 排成 n× n阵列 ,使得各行中的各数之和、各列中的各数之和以及两条对角线中的各数之和都是同一个数 S,这个数 S就称为幻方的 ·幻·和[1] .为了方便本文中的叙述 ,把左上至右下的一条对角线称为主对角线 ,把右上至左下的对角线称为副对角线 .显然 ,n阶幻和S=n( n2 +1 ) / 2 .幻方有许多特殊的构造方法 ,所有的奇数阶幻方都可以用 L oubère构造法构造 [2 ] .本文中利用 L oubère构造法构造 n =4k +2阶幻方 .1　划分幻方 ,把 4k + 2阶幻方划分为 4个奇数阶幻方A CD B图 1　划分小幻方　　令 u =n/…     

完美幻方的最简构造法

将 1到 n2个连续自然数填入 n× n个格子组成的方阵中 .当各行、各列、两对角线及其各互补对角线上的 n个数之和均相等时 ,称其为 n阶完美幻方 ,幻和常数 Sn=n( n2 + 1 ) /2 .当 n =4k或 n为以 3不能整除的奇数阶时 ,作者从多种平衡关系中总结出容易掌握的构造方法 .1　 n =4k (k∈ N+ )时1 2 5 65 5 1 3 1 460 5 93 45 45 3 1 5 1 65 85 72 93 0 444 3 1 71 840 3 93 1 3 2 42 41 1 92 0 3 83 75 2 5 1 5 66463 91 05 0 497862 61 1 1 1 248472 5 2 63 63 5 2 1 2 24645 2 72 83 43 3 2 3 2 4图 3　 8阶完美幻方 (8A,S8=2 60 )　　首先将…     

双重幻方与多元双重幻方

在双重幻方的基础上,提出了多元双重幻方的命题。将函数引入了双重幻方与多元双重幻方的构造,设计出构造双重幻方与多元双重幻方的函数模型,推导出其和与积的均等值公式。     

4n附4中心对称幻方的构造及性质

给出了４ｎ附４中心对称幻方的构造性质，并对其运算做了充分的讨论。     

立体幻方的构造

本文首先提出奇数阶立体幻方及2~K阶(K=2,3,……)立体幻方的最简构造方法,并解决了最困难的一种立体幻方(即偶数阶中非2~K阶又不能通过复合方法来构造的幻方,如12阶等可通过复合方法得到)的构造方法。     

4n阶4中心对称幻方的构造及性质

给出了４ｎ阶４中心对称幻方的构造性质，并对其运算做了充分的讨论．     

全最小二乘法在红外光谱法同时测定多组分混合物中的应用

利用全最小二乘法，对丙酮中所含红外光谱重叠严重的苯及甲苯所测数据，自编程序，在计算机上进行处理，所得结果相对误差均小于６％，优于最小二乘法．     

羽绒羽毛检测方法分析

分析了现今的羽绒羽毛检测项目与方法并探讨了各种方法存在的弊端.介绍了氢氧化钠溶液对几种羽毛的化学溶解性,结果表明,羽毛的溶解性差异可以作为羽毛种类鉴别方法之一.     

关于奇数阶拉丁方正交的注记

本文指出文献[1]中关于拉丁方正交的结论是错误的,并给出了两个奇数阶拉丁方正交的充分必要条件。     

任意浓度下活度系数的计算

根据实验所测有关电解质溶液的活度系数,确定其数学模型为γ=e~(a bm cm~2 d/m)。利用最小二乘法建立了1∶1型电解质活度系数与浓度之间的函数关系式,从而通过此关系式可对任意浓度下1∶1型电解质的活度系数进行预测,其相对误差不超过2.6％。     

涤纶POY微细旦丝平行纺丝设备及工艺探讨

介绍了涤纶POY微细旦丝平行纺丝卷绕设备及纺丝工艺技术特点。重点对纺丝箱体、卷绕机、冷却条件等设备及工艺特点进行了详细讨论。     

A COMPARISON OF METHODS FOR THE MICROBIOLOGICAL SAMPLING OF COMPRESSED GASES

A study was carried out to evaluate eight methods for microbiological sampling of compressed gases. The devices tested were: Koch exposed plate; exposed honeypot; exposed bottle; Hollaender & Dalla Valle device; Porton impinger; Multistage liquid impinger; ASBC.impinger; membrane filtration method. The devices were compared by presenting a constant number of organisms per unit volume of gas to each device. The organism used was Bacillus stearothermophilus which in its spore form represents the type of organism which is most difficult to entrap. Other aspects of alternative sampling methods which were examined included testing of potential desiccation effects involving vegetative microorganisms on membrane filters, and susceptibility of devices to external contamination. The method recommended was a modification of that of Hollaender & Dalla Valle. This method had the highest collection efficiency and greatest statistical reliability of all those tested. The recommended methods of analysis of the IOB, EBC and ASBC were found to be inferior in a number of respects including susceptibility to external contamination, poor collection efficiency and statistical variability.     

METHODS FOR THE DETERMINATION OF VOLATILE NITROSAMINES IN MALT,WORT AND BEER

Methods for the analysis of beer, wort and malt for NDMA at the one in 10⁹ level using the thermal energy analyzer have been evaluated. The beer and wort procedure using Preptube extraction has been shown to give excellent results. For malt, the preparation of an aqueous extract, followed by analysis by the beer procedure, also gives excellent results. Vacuum distillation from mineral oil has also been examined for the analysis of malt. Providing sufficient aqueous phase is initially present, this procedure yields results similar to those from aqueous extraction. The methods will also detect NDEA, although no NDEA has been observed in any of the beer, wort or malt samples examined. NDMA has been observed to be present in bound forms in malt and Preptubes and is released by the addition of water     

统计中的查找计数方法

本文以选票统计问题为例,讨论了3种查找计数方法(顺序法、二分法、插值法)在统计中的应用,提出了一种新颖的查找计数方法——一次到位法,给出了用FOXPLUS数据库语言编写的算法子程序,并比较了它们各自的特点和适用范围。     

IMPROVED METHODS FOR THE QUALITY CONTROL OF KIESELGUHR

Measurement of the effective bed voidage and Sauter mean diameter enables the mean hydraulic radius of a given kieselguhr to be calculated. This is the best single indicator of the performance of a kieselguhr. An improved method for measurement of effective bed voidage employs a fine grade of calcium carbonate “filler” to measure interparticulate voidage. Results are consistent with published particulate bed voidages. Particle size analysis can also be used to estimate the effective bed voidage, to calculate the Sauter mean diameter and to check on the consistency of supplied kieselguhr. The correlation for effective bed voidage is strengthened by employing different calibrations for each supplier.