在人们的生产实践中，经常会遇到如何利用现有资源来安排生产，以取得最大经济 效益的问题。此类问题构成了运筹学的一个重要分支—数学规划，而线性规划(Linear Programming 简记 LP)则是数学规划的一个重要分支。自从 1947 年 G. B. Dantzig 提出 求解线性规划的单纯形方法以来，线性规划在理论上趋向成熟，在实用中日益广泛与深 入。特别是在计算机能处理成千上万个约束条件和决策变量的线性规划问题之后，线性 规划的适用领域更为广泛了，已成为现代管理中经常采用的基本方法之一。 1.1 线性规划的实
标签： 实践
上传时间： 2018-09-17
上传用户：中国宏军
%球体 close all; G=6.67e-11; R=2;%球体半径 p=4.0;%密度 D=10.0;%深度 M=(4/3)*pi*R^3*p;%质量 x=-20:1:20; g=G*M*D./((x.^2+D^2).^(3/2)); Vxz=-3*G*M*D.*x./((x.^2+D^2).^(5/2)); Vzz=G*M.*(2*D^2-x.^2)./((x.^2+D^2).^(5/2)); Vzzz=3*G*M.*(2*D^2-3.*x.^2)./((x.^2+D^2).^(7/2)); subplot(2,2,1) plot(x,g,'k-'); xlabel('水平距离(m)'); ylabel('重力异常值'); title('球体重力异常Δg'); grid on subplot(2,2,2) plot(x,Vxz); xlabel('水平距离(m)'); ylabel('导数值'); title('Vxz'); grid on subplot(2,2,3) plot(x,Vzz); xlabel('水平距离(m)'); ylabel('导数值'); title('Vzz'); grid on subplot(2,2,4); plot(x,Vzzz); xlabel('水平距离(m)'); ylabel('导数值'); title('Vzzz'); grid on %% %水平圆柱体 close all G=6.67e-11; p=10.0;%线密度 D=100.0;%深度 x=-200:1:200; g=G*2*p*D./(x.^2+D^2); Vxz=4*G*p*D.*x./(x.^2+D^2).^2; Vzz=2*G*p.*(D^2-x.^2)./(x.^2+D^2).^2; Vzzz=4*G*p.*(D^2-3.*x.^2)./((x.^2+D^2).^3); subplot(2,2,1) plot(x,g,'k-'); xlabel('水平距离(m)'); ylabel('重力异常值'); title('水平圆柱体重力异常Δg'); grid on subplot(2,2,2) plot(x,Vxz); xlabel('水平距离(m)'); ylabel('导数值'); title('Vxz'); grid on subplot(2,2,3) plot(x,Vzz); xlabel('水平距离(m)'); ylabel('导数值'); title('Vzz'); grid on subplot(2,2,4); plot(x,Vzzz); xlabel('水平距离(m)'); ylabel('导数值'); title('Vzzz'); grid on %% %垂直台阶 G=6.67e-11; p=4.0;%密度 h1=50.0;%下层深度 h2=40.0;%上层深度 x=-100:1:100; g=G*p.*(pi*(h1-h2)+x.*log((x.^2+h1^2)./(x.^2+h2^2))+2*h1.*atan(x./h1)-2*h2.*atan(x./h2)); Vxz=G*p.*log((h1^2+x.^2)./(h2^2+x.^2)); Vzz=2*G*p.*atan((x.*(h1-h2))./(x.^2+h1*h2)); Vzzz=2*G*p.*x*(h1^2-h2^2)./((h1^2+x.^2).*(x.^2+h2^2)); subplot(2,2,1) plot(x,g,'k-'); xlabel('水平距离(m)'); ylabel('重力异常值'); title('垂直台阶重力异常Δg'); grid on subplot(2,2,2) plot(x,Vxz); xlabel('水平距离(m)'); ylabel('导数值'); title('Vxz'); grid on subplot(2,2,3) plot(x,Vzz); xlabel('水平距离(m)'); ylabel('导数值'); title('Vzz'); grid on subplot(2,2,4); plot(x,Vzzz); xlabel('水平距离(m)'); ylabel('导数值'); title('Vzzz'); grid on %% %倾斜台阶 G=6.67e-11; p=4.0;%密度 h1=50.0;%下层深度 h2=40.0;%上层深度 a=pi/6;%倾斜角度 x=-500:1:500; g=G*p.*(pi*(h1-h2)+2*h1.*atan((x+h1*cot(a))./h1)-2*h2.*atan((x+h2*cot(a))./h1)+x.*sin(a)^2.*log(((h1+x.*sin(a).*cos(a)).^2+x.^2.*sin(a)^4)./((h2+x.*(sin(a)*cos(a))).^2+x.^2.*sin(a)^4))); Vxz=G*p.*(sin(a)^2.*log(((h1*cot(a)+x).^2+h1^2)./((h2*cot(a)+x).^2+h2^2))-2*sin(2*a).*(atan((h1/sin(a)+x.*cos(a))./(x.*sin(a)))-atan((h2/sin(a)+x.^cos(a))./(sin(a).*x)))); Vzz=G*p.*(0.5*sin(2*a)^2.*log(((h1*cot(a)+x).^2+h1^2)./((h2*cot(a)+x).^2+h2^2))+2*sin(a)^2.*(atan((h1/sin(a)+x.*cos(a))./(x.*sin(a)))-atan((h2/sin(a)+x.*cos(a))./(x.*sin(a))))); Vzzz=2*G*p*sin(a)^2.*((x+2*h2*cot(a))./((h2*cot(a)+x).^2+h2^2)-(x+2*h1*cot(a))./((h1*cot(a)+x).^2+h1^2)); subplot(2,2,1) plot(x,g,'k-'); xlabel('水平距离(m)'); ylabel('重力异常值'); title('倾斜台阶重力异常Δg'); grid on subplot(2,2,2) plot(x,Vxz); xlabel('水平距离(m)'); ylabel('导数值'); title('Vxz'); grid on subplot(2,2,3) plot(x,Vzz); xlabel('水平距离(m)'); ylabel('导数值'); title('Vzz'); grid on subplot(2,2,4); plot(x,Vzzz); xlabel('水平距离(m)'); ylabel('导数值'); title('Vzzz'); grid on %% %铅锤柱体 G=6.67e-11; p=4.0;%密度 h1=50.0;%下层深度 h2=40.0;%上层深度 a=3;%半径 x=-500:1:500; g=G*p.*((x+a).*log(((x+a).^2+h1^2)./((x+a).^2+h2^2))-(x-a).*log(((x-a).^2+h1^2)./((x-a).^2+h2^2))+2*h1.*(atan((x+a)./h1)-atan((x-a)./h1))-2*h2.*(atan((x+a)./h2)-atan((x-a)./h2))); Vxz=G*p.*log((((x+a).^2+h1^2).*((x-a).^2+h2^2))./(((x+a).^2+h2^2).*((x-a).^2+h1^2))); Vzz=2*G*p.*(atan(h1./(x+a))-atan(h2./(x+a))-atan(h1./(x-a))+atan(h2./(x-a))); Vzzz=2*G*p.*((x+a)./((x+a).^2+h2^2)-(x+a)./((x+a).^2+h1^2)-(x-a)./((x-a).^2+h2^2)+(x-a)./((x-a).^2+h1^2)); subplot(2,2,1) plot(x,g,'k-'); xlabel('水平距离/m') ylabel('重力异常值') title('铅垂柱体重力异常') grid on subplot(2,2,2) plot(x,Vxz); xlabel('水平距离(m)'); ylabel('导数值'); title('Vxz'); grid on subplot(2,2,3) plot(x,Vzz); xlabel('水平距离(m)'); ylabel('导数值'); title('Vzz'); grid on subplot(2,2,4); plot(x,Vzzz); xlabel('水平距离(m)'); ylabel('导数值'); title('Vzzz'); grid on
上传时间： 2019-05-10
上传用户：xiajiang
将ug软件中的刀轨刀路转换成fanuc控制系统数控加工中心可执行的的g代码
标签： 处理器
上传时间： 2019-07-01
上传用户：yanxizhai
书名：bessel functions and their applications 作者：B. G. Korenev
上传时间： 2019-12-30
上传用户：944905540
PRODUCT DESCRIPTION The AD810 is a composite and HDTV compatible, current feedback, video operational amplifier, ideal for use in systems such as multimedia, digital tape recorders and video cameras. The 0.1 dB flatness specification at bandwidth of 30 MHz (G = +2) and the differential gain and phase of 0.02% and 0.04° (NTSC) make the AD810 ideal for any broadcast quality video system. All these specifications are under load conditions of 150 Ω (one 75 Ω back terminated cable). The AD810 is ideal for power sensitive applications such as video cameras, offering a low power supply current of 8.0 mA max. The disable feature reduces the power supply current to only 2.1 mA, while the amplifier is not in use, to conserve power. Furthermore the AD810 is specified over a power supply range of ±5 V to ±15 V.
上传时间： 2020-04-19
上传用户：su1254
The contemporary view of the Smart City is very much static and infrastructure- centric, focusing on installation and subsequent management of Edge devices and analytics of data provided by these devices. While this still allows a more efficient management of the city’s infrastructure, optimizations and savings in different do- mains, the existing architectures are currently designed as single-purpose, vertically siloed solutions. This hinders active involvement of a variety of stakeholders (e.g., citizens and businesses) who naturally form part of the city’s ecosystem and have an inherent interest in jointly coordinating and influencing city-level activities.
标签： Internet Systems Cities People Things Smart The and of
上传时间： 2020-05-26
上传用户：shancjb
At present, there is a strong worldwide push toward bringing fiber closer to indi- vidual homes and businesses. Fiber-to-the-Home/Business (FTTH/B) or close to it networks are poised to become the next major success story for optical fiber com- munications. In fact, FTTH connections are currently experiencing double-digit or even higher growth rates, e.g., in the United States the annual growth rate was 112% between September 2006 and September 2007, and their presence can add value of U.S. $4,000–15,000 to the selling price of a home.
标签： Technologies Broadband Networks Access
上传时间： 2020-05-26
上传用户：shancjb
Emerging technologies such as WiFi and WiMAX are profoundly changing the landscape of wireless broadband. As we evolve into future generation wireless networks, a primary challenge is the support of high data rate, integrated multi- media type traffic over a unified platform. Due to its inherent advantages in high-speed communication, orthogonal frequency division multiplexing (OFDM) has become the modem of choice for a number of high profile wireless systems (e.g., DVB-T, WiFi, WiMAX, Ultra-wideband).
标签： Broadband Wireless Networks
上传时间： 2020-05-26
上传用户：shancjb
The field of digital communication has evolved rapidly in the past few decades, with commercial applications proliferating in wireline communi- cation networks (e.g., digital subscriber loop, cable, fiber optics), wireless communication (e.g., cell phones and wireless local area networks), and stor- age media (e.g., compact discs, hard drives). The typical undergraduate and graduate student is drawn to the field because of these applications, but is often intimidated by the mathematical background necessary to understand communication theory.
标签： Communication Fundamentals Digital of
上传时间： 2020-05-27
上传用户：shancjb
This book describes how global mobile communication was made. It is written for those who want or need to know how this was achieved e.g.: † Young professionals who want to build their career on GSM and UMTS and need to understand the basics † Strategic and technical planners who want to drive the future GSM and UMTS develop- ment † Strategists who plan to repeat GSM’s success in the fourth generation † Academics, who want to understand and analyse the development of GSM and UMTS; † Activists in other large scale international communication projects who want to use experiences gained
标签： Creation UMTS GSM and The of
上传时间： 2020-05-27
上传用户：shancjb
