指数的

On the basis of the molecular branching index of Randic,by adding Pauling molecular electronegative,a new molecular topological index was proposed and used to correlate between the chemical structures of haloalkane s and their boiling point at normal pressure.

在Rand ic提出的分子支化度指数的基础上，引进了卤原子的电负性，提出了一种新的拓扑指数，并对饱和卤代烃在常压下的沸点与化学结构之间的关系进行研究，建立了回归方程，相关系数达到0.995，预测值与实验值基本吻合

Finally, the author proves the sharp bound for the indices of convergence of n*n reducible Boolean matrices with f〓≥2 the writer lets f〓 be the greatest common divisor of the distinct lengths of the elementary cycles of the associated digraph D (A for a reducible Boolean matrix A , and characterizes the matrices with the largest index.

最后，设f〓为可约布尔矩阵A的伴随有向图D的所有圈长的最大公约数，当f〓≥2时，我们得到了可约布尔矩阵幂敛指数的一个上界和达到最大幂敛指数的矩阵的完全刻划。

The index of producer prices shows (in the national currency of the country concerned) changes in the ex works sale prices of all products sold on the domestic markets of the various countries, excluding imports.

该指数的生产者价格指数表明的变化工厂销售价格上出售的所有产品的国内市场的各个国家，但不包括进口。

Firstly, we give out a reduction way for quasilinear generalized system A〓=G , and the concept of the index κ geometrically nonsingularity, where A is singular and of smooth kernal space. By using the canonical projection mappings onto the space of ker A , a class singular pointimpasse point only owned by nonlinear generalized system is also studied and we also prove that the regular index κ quasilinear generaized system A〓=G defined on the region W is equivalent with an ODEs 〓 defined on a submanifold W〓 of the W, so we reduce the problem of quasilinear generalized system to the problem of an ODEs.

首先利用投影函数，给出了拟线性广义系统A〓=G的一种归约方法，提出了指数κ几何非奇异的概念，同时对广义系统特有的一类奇点-寂点进行了研究，证明了正则指数κ的拟线性问题A〓=G等价于在其定义域W中某一个子流形W〓上的正常微分方程〓，从而将拟线性广义系统的问题归结为常微分方程问题。

Based on the meteorological observation data and the vegetation index data in Yulin,synchronousness relationship of vegetation index and sandstorm activities were analyzed,the results indicates that,Intra-annual changes of vegetation covers and sandstorm activities are evidently inverse synchronous,which may conduce to reducing the wind-break and sand-fixing function of vegetation.

以榆林市为例，利用气象观测和植被指数数据，对植被覆盖与沙尘暴活动发生的时间同步性关系进行了分析，结果显示：植被覆盖与沙尘暴活动存在着年内的时间不同步性，严重制约植被防风固沙生态功能的发挥；沙尘暴日数与植被指数的年际变化呈现出反相关系证明了植被覆盖对沙尘暴活动具有很强的防护作用。

A new group of autocorrelation topological index (At、Bt、Ct and Dt) was designed and developed based on the vertex degree of molecular topology and autocorrelation function of mathematics. The autocorrelation functions were calculated from the square root of the vertex degree、modified vertex degree and their combination, that is d i、、 and . The matrix description method and the algorithm of computer software have been developed for the new topological index calculation.

针对目前自相关拓扑指数的计算完全依赖于实验参数而存在的问题，以分子拓扑学点价和自相关函数研究为基础，将点价、修正点价及其组合：、、、的平方根分别作为自相关函数中的f，设计开发出一组新的以点价计算为基础的自相关拓扑指数At、Bt、Ct和Dt。

Methods 104 patients with chronic cerebral circulation insufficiency were randomly divided into two groups.in basis of routine therapy, patients in treatment group (n=56) were treated by yangxue qingnao granules,4 g,three times a day; patients in control group (n＝48) were treated by troxerutin, 3 pills a day.the course was 30 days in two groups.the indexes of hemorrheology and mca,aca,pca, va, ba and pi were observed before and after treatment.results there were significant differences between two groups in blood viscosity, plasma viscosity, mca,aca,pca,mca and pi after treatment (p.05).conclusion yangxue qingnao granules have definite effect on chronic cerebral circulation insufficiency, and decrease and hemorrheology in patients with ccci, relieve angiospasm and improve clinical symptoms.

将慢性脑供血不足患者104例随机分为2组。在常规治疗基础上治疗组56例加服养血清脑颗粒，每次4 g，每日3次口服。对照组48例在常规治疗基础上加服曲克芦丁，每次2片，每日3次口服。2组均30日为1个疗程。观察2组临床疗效，治疗前后血液流变学指标及大脑中动脉、大脑前动脉、大脑后动脉、左右椎动脉和基底动脉的搏动指数及阻力指数的变化。结果 2组治疗后全血黏度、血浆黏度，mca、aca、pca的pi及mca的ri及总有效率比较差异均有统计学意义(p＜0.05)。结论养血清脑颗粒治疗慢性脑供血不足疗效确切，能降低ccci患者的血液黏稠度及血液流变学指标，增加脑供血，缓解血管痉挛，改善临床症状，改善脑供血不足。

The results show that the value of burning rate pressure exponent of propellant and its change law can bring about a great change of interior ballistic behavior, The new type high-energy propellant whose burning rate pressure exponent is decrescent as pressure increasing can obtain higher interior ballistic piezometric efficiency, and reduce the sensitivity of bore pressure and muzzle velocity on loaded conditions of propellant.

结果表明，发射药燃速压力指数的大小及其随压力的变化规律对内弹道性能有很大的影响，对于燃速压力指数随压力升高而减小的新型高能发射药，可获得较高的内弹道示压效率，降低膛压和弹丸初速对发射药装填条件的敏感性。

Based on geomorphy and anthropo-factor that influence land use structure, D and S of 8 types is analyzed, and the result indicate that:(1) the complicated geomorphy is uppermost factor that influence fractal dimension of land use type;(2) the social economical level influence D and S of land use structure in a certain extent;(3) the average fractal dimension values and average stability indexes are integrative reflection of the land use structure of each region.

结果表明：(1)复杂的地貌类型是影响土地利用类型D 值和S值的最主要因素；(2)社会经济发展水平一定程度上影响土地利用类型的分维值和稳定性指数；(3)区域土地利用类型的平均分维值、稳定性指数的大小是土地利用结构的综合反映。

"Davidia involucrate" was a rare valuable and endangered plant in China. In this article, We studied the distribution pattern of its population with t test of Dispersal index, X^2 test of Poisson distribution and F test of Morisita's index. Its assemble intensity is also analyzed through Negative binomial index, Green's index, Lloyd's index and Patchness index.

采用扩散系数的t检验、Poisson分布的x^2拟合检验及Morisita指数的F检验来研究珙桐种群的空间分布格局类型，用负二项参数、Green指数和Lloyd的平均拥挤度m(上标*与聚块性指标来研究珙桐的聚集强度。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。