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Low molecular weight mannuronic acid, guluronic acid and κ carrageenan were prepared from algin and carrageenan by the acid hydrolysis method, and their weight average molecular weights and the distribution widths of molecular weight were determined by high performance gel permeation chromatography respectively.

本文以褐藻胶和κ-卡拉胶为原料通过酸水解分别获得了低聚的甘露糖醛酸、古罗糖醛酸和低聚κ-卡拉胶，并采用 HPGPC法测定了这 3种低聚糖的重均分子量。在此基础上再经硫酸酯化和成盐修饰制备了各自的硫酸酯碱式铝盐。

The object of projectile design is analyzed, and the layer-TOPSIS method is provided for the evaluation of total effectiveness by taking the layer concept into the TOPSIS method. In the calculation of object weights, the grade calculation method is suggested, which has less dependence on the subjectivity of decision-maker and can take account of both sensitivity and allowableness of objects, the geometric-arithmetic method is provided for grade weight calculation and methods for sensitive weight and allowable weight are given. Of modes in system analyzing, the penetration model of target with spherical-fragment is carried out based on the theory of Dynamic Spherical Cavity Expansion, and it is a supplement of the models for calculation the damage of the fragmentation warhead to target.

对弹丸设计进行了目标分析；通过在TOPSIS方法中引入层次结构的概念，提出了适用于弹丸总体效能评价的层次TOPSIS评价方法；在指标权重计算中，提出了对决策者主观依赖较少的能反映指标的敏感性和相容性的分级权重计算方法；在分级权重计算中，分别给出了等比-等差权值计算方法和敏感-相容权值计算方法；在系统分析的模型中，对破片战斗部的威力计算中的模型进行了补充，在空穴膨胀理论的基础上提出了球形破片侵彻有限厚靶板的侵彻计算模型。

The effects of temperature,shearing rate,angular frequency,molecular weight and molecular weight distribution on the rheological behavior were discussed.The resultsshowed that the molecular weight and its distribution of the polymer inferred from ...

研究表明，从稳态和动态测得的流变曲线求得的4种PP切片的分子量及其分布指数是同落球粘度法与熔融指数法相结合求得的分子量分布指数相吻合的。

The apparent weight of calcium,the length and weight of the rats,and the length,weight,bone density and calcium content of the femurs were measured in every group.

将SD大鼠随机分成6组，分别喂养氨基酸钙复合物、碳酸钙和低钙饲料，通过测量相应饲料喂养大鼠的身长和体重，钙表观吸收率，以及股骨的长度、重量、骨密度、钙含量指标，观察氨基酸钙复合物对SD大鼠骨密度的影响。

For each substance, a mole is its atomic weight, molecular weight, or formula weight in grams.

对于每种物质来说，莫耳是它以克为单位的原子量、分子量或式量。

It measures weight quickly and accurately and displays weight is gram, avoirdupois ounce, troyounce, or penny weight, totally 4 units.

它迅速测量重量并且准确地和显示克、盎司、ozt 或 dwt ， 4 个计量单位。

Round the actual weight is loaded through the load bearing axle parts, such as the role of the body in the weight-bearing load of the central hole roulette wheel, the weight-bearing pressure rim round the bottom of rubber board in the track.

负重轮的实际受载情况是负重轮轴通过轴承等零件将车体载荷作用在负重轮轮盘的中心孔上，负重轮下方橡胶轮缘压在履带板上。

In this dissertation, the best simultaneous approximation with weight to infinite sequence from simultaneous-suns in complex normed linear space is considered, and in the case when the weight satisfies a certain condition, the characterizations of approximation from a simultaneous-sun and uniqueness of approximation from a RS-set are obtained; moreover, in the case when the weight is free, the characterizations of approximation to a totally bounded sequence from a convex set are established.

本文在复赋范空间中研究了同时太阳集对无限序列的加权同时逼近问题，在权满足一定条件时，通过把所研究问题转化为连续向量值函数空间中相应集对一个上半连续函数的最佳逼近问题，得到了逼近的特征和RS集逼近的唯一性定理，有例表明它们是已有结果的本质推广；在权不受限制时，得到了凸集对全有界序列逼近的特征。

The result showed that the single correlation between the characters of weight and heart girth, chest width and circumference of cannon bone was significantly different. The correlation between weight and heart girth, chest width, circumference of cannon bone was highly positive correlation. Among seven regression models, the correlation index of six regression models was over 0.7, but that of 60 days was 0.452. The result suggested that selecting body weight was efficient through heart girth, body high, chest width and circumference of cannon bone.

对不同日龄各项体尺与体重建立的了回归方程，结果表明，60日龄回归模型的决定系数R~2=0.452，其它6个回归模型的相关指数均在0.7以上，其中方程1、5、6、7的相关指数都在0.9以上，表明这些回归方程中各项体尺指标与体重之间相关密切，根据胸围、管围、体高和胸宽对体重的选择都是有效的，具有一定的参考作用。

The time required for the feed passing through the alimentary tract increased with the increase of body weight.Pigs with body weight of33 kg.were fed with daily ration of 48g and 30g per kg body weight,and the speed of chyme passing throug...

稠喂和稀喂对通行速度没有明显影响，而且日粮消化率以稠喂的为高，生喂或熟喂对通行速度及消化率都没有明显影响，在青饲料不同加工方法中以鲜甘薯藤打浆的通行速度较快，消化率也较高。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。