查询词典 arithmetic

Using Greek sources, he compiled in Latin selections from elementary treatises on arithmetic , geometry, and astronomy.

他根据希腊材料用拉丁文选编算术、几何与天文的初等读物。

It is analyzed that the identity-based cryptography and the elliptic curve encryption arithmetic,and also its application in E-business.

本文详细讨论了基于身份的密码体制和椭圆曲线加密算法，分析了其在电子商务的安全交易过程中的应用。

The definition and characters of Double-module quadratic residue is discussed in this paper,The arithmetic for choosing base point of Elliptic curve cryptosystem in optimal extension field is worked out and proven mathematically,moreover,the successful probability is also provided.

本文讨论了重模二次剩余的定义、性质，完整地设计出选取最优扩域上的椭圆曲线密码系统的基点的算法，并给出了选取成功的概率和相关数学证明。

In the process of elliptic curve digital signature verification, the elliptic curve scalar multiplication and the elliptic point addition, which are under different coordinates, need to be calculated twice and once, respectively. With operands allocation, the two operations in the thesis are using the shared registers and arithmetic units as well as the same modular inverse process. No extra resource is needed for the introduction of point addition. Hence the resource utilization efficiency is optimized.

论文对这两种不同坐标系下的计算进行了寄存器和运算单元的统一调度，使它们的求逆运算共用同样的流程，减小了控制状态机的复杂度，并且在实现标量乘法的基础上，没有增加额外的运算单元或寄存器，点加运算的所有计算资源均和标量乘法公用，最大限度的提高了资源利用率。

In the embedment of the information, the hiding algorithm of Discrete Cosine Transform based on modular arithmetic has been chosen in the frequency law.

在秘密信息的嵌入入程中，选择了频域法中的基于模运算的离散余弦变换隐藏算法，这样就增强了隐秘载体在传输入程中的安全性。

The main research work of this paper are focused on following areas:(1) Based on review of the theory and methods on measurements of particle fields, a new idea for obtaining particle size and velocity distribution within a spray through imaging the particle field with a laser light sheet was put forward;(2) A DPIV (Digital Particle Image Velocimetry) system, is fit for velocity measurements of low speed flows, was developed and expended to particle size distribution measurement;(3) An arithmetic for particle velocity field reconstruction was developed, and the velocity distribution of water mist was also obtained;(4) A software system for particle analysis, which based on image geometry emend, de-noise and image partition was developed, the parameters such as particle size distribution, mean diameter, number of particles, minimum and maximum diameter can be got with this system;(5) A water mist system was developed and its characteristics, such as droplet velocity, size distribution, number of droplets and spray cone angle under different conditions were obtained from experiments with PIVS;(6) The measurement results of water mist characteristics with PIVS were compared and analyzed with the simply simulated results, and in addition, in order to verify the accuracy of PIVS, some experiments were conducted with the standard particles, such as glass-ball with known mean diameter of 50μm and 115μm, metallic coated tracing particle with mean diameter of 12μm;(7) Some experimental studies on interaction of water mist with liquid pool fires were conducted.

本论文的主要工作包括以下几个方面：（1）在对粒子场测量的相关理论和具体方法进行综述分析的基础上，提出了通过采用激光片光对粒子场进行成像以获取其粒径和速度等参数分布的新思路；（2）研制了适宜于低速流动速度场测量的DPIV(Digital Particle Image Velocimetry)系统，并使其实现了对粒子场粒径分布的测量功能；（3）研制了基于粒子运动轨迹的速度场重建算法，获取了细水雾雾场的速度分布；（4）研制了基于几何校正、去噪、图象分割等图象处理方法的"粒度分析软件系统"，该系统既可分析给出粒子场的粒径分布直方图和平均粒径，还可给出粒子的数目以及最大、最小粒径等信息；（5）建立了一细水雾发生系统，并应用上述方法对不同压力条件下细水雾系统的雾场特性（如速度分布、雾滴粒径分布、雾滴的数目、喷雾张角以及雾化长度等）进行了实验测量研究；（6）对细水雾特性参数的PIVS测量结果与计算机简单模拟计算结果进行了定性比较分析，并利用平均粒径为50μm和115μm的玻璃球以及12μm的标准示踪粒子对PIVS系统的粒径和速度测量结果进行了实验验证，同时对其局限性进行了分析讨论；（7）对不同工况条件下细水雾与油池火相互作用的过程进行了模拟实验研究。

We need to add the controller in order to enhance the control precision and response speed of DVD focus servo system, and then a new emendation arithmetic was put forward.

为了提高DVD聚焦伺服系统的控制精度和响应速度需要加入控制器，提出了一种新的校正算法。

Using the client"s importment, enchiridion"s information and design experience, along with efficient grabble arithmetic, we can get the Vehicle-Bridge parts porperty value quickly.

第四章将产品进行了组件化分析，以产品结构更改范围最小化为依据，给出了仿真模型子系统的划分方法，以便实现产品的结构更改与优化。

On the basis of mathematical analysis, a multiobjective nonlinear programming model on a multiobjective transporting vehicle arrangement is set up. Two fast arithmetic methods, i. e. gradual integralization method and enumerative integralization method, are put forward hereafter and an actual problem is solved by making use of the Matlab program.

针对露天矿生产中的一个多目标优化运输问题，基於数学分析，建立了一个多目标非线性规划模型；提出了模型的逐步整数化方法和穷举整数化方法两种快速算法，并利用研制的Matlab程序计算了一个实际问题。

Potential Species' Distribution System, a new GIS-based system, has been designed and implemented to predict the potential distribution of species by using presence data only. The result, normally overpredicted by traditional Environment Envelope Model, is improved by using hierarchical cluster arithmetic that can reduce the influence caused by outliers.

在这一系统中，通过层次聚类算法对物种已知分布点数据进行处理，减少了异常值对预测结果的影响，从而解决了环境包络模型预测结果过于乐观的问题，在物种已知分布数据较少时也能取得较好的结果。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐