研究斜程湍流大气中部分相干GSM 波束的扩展、漂移及闪烁研究。斜程湍流大气中部分相干波束的偏振特性及漫射目标的部分相干GSM 波束的散射特性。斜程湍流大气中部分相干GSMP 波束的平均强度，波束半径和双频复相干度的研究。
Research on the extension, drift, and scintillation of partially coherent GSM beams in oblique turbulent atmosphere. The polarization characteristics of partially coherent beams in oblique turbulent atmosphere and the scattering characteristics of partially coherent GSM beams from diffuse targets. Research on the average intensity, beam radius, and dual frequency complex coherence of partially coherent GSMP beams in oblique turbulent atmosphere. (2023-09-09, PDF, 2776KB, 下载0次)
IPC-4552B-2021 EN印制板化学镀镍 浸金(ENIG)镀覆性能规范 英文版.rar (2022-02-04, PDF, 1103KB, 下载0次)
http://www.pudn.com/Download/item/id/1643939700556083.html
Rockchip RK3399是瑞芯微推出的一款低功耗、高性能的应用处理器芯片，该芯片基于Big.Little架构,即具有独立的NEON协同处理器的双核Cortex-A72及四核Cortex-A53组合架构，主要应用于计算机、个人互联网移动设备、VR、广告机等智能终端设备。
Rockchip rk3399 is a low-power, high-performance application processor chip, which is based on Big.Little Architecture, namely dual core cortex-a72 and quad core cortex-a53 composite architecture with independent neon co processor, is mainly used in intelligent terminal devices such as computers, personal Internet mobile devices, VR, advertising machines, etc. (2020-07-22, PDF, 414KB, 下载2次)
陆大金编写的第一版随机过程与应用的习题，深度学习必备！
The first version of random process and application exercises compiled by Lu Dajin is necessary for deep learning! (2020-06-19, PDF, 613KB, 下载7次)
双优（VV-808S)车载小型对讲机使用说明书
Operation manual of vehicle mounted small walkie talkie (vv-808s) (2020-03-20, PDF, 447KB, 下载1次)
模糊pid控制器在两轴双框架光电平台上的应用
Application of fuzzy pid controller on optical level stage (2019-10-29, PDF, 2449KB, 下载0次)
以广域相量测量系统为技术平台，建立基于模型预测控制的含规模化风电场/群互联电网的负荷频率分散预测控制模型。以典型双区域负荷频率控制模型为例，考虑不同风电渗透率情况。仿真研究结果表明，所提基于模型预测控制的负荷频率分散控制模型不但能够有效地跟踪风电输出功率的随机波动， 维持系统频率及区域间交换功率在较小的范围内变化， 并且控制效果明显优于常规 PI 型负荷频率控制器。
Based on the wide area phasor measurement system (WAPMS), a decentralized load-frequency predictive control model for large-scale wind farm/cluster interconnected power grids based on model predictive control (MPC) is established. The typical two-zone load frequency control model is taken as an example to consider the different wind power permeability. The simulation results show that the proposed decentralized load frequency control model based on model predictive control can not only effectively track the random fluctuation of wind power output, but also maintain the change of system frequency and inter-area exchange power in a small range, and the control effect is significantly better than that of conventional PI load frequency controller. (2019-08-17, PDF, 988KB, 下载13次)
America Georgia Doctor
America Georgia Doctor (2018-09-13, PDF, 97KB, 下载0次)
双11电子书_不一样的技术创新_完整版
11 different _ e-book technology innovation _ full version of _Final (2017-11-13, PDF, 19526KB, 下载1次)
这是一个DOCSIS规范合作努力的结果在有线电视实验室，公司的方向进行电缆行业及其客户的利益。本文档可能包含对未拥有或控制的其他文档的引用。CableLabs。使用和理解本文档可能需要查阅其他文件。设计、制造、分销，基于此，使用、销售或服务产品或提供服务文件可能要求第三方提供知识产权许可证。本文档中引用的技术。
This DOCSIS specification is the result of a cooperative effort
undertaken at the direction of Cable Television Laboratories, Inc. for the
benefit of the cable industry and its customers. This document may
contain references to other documents not owned or controlled by
CableLabs. Use and understanding of this document may require
access to such other documents. Designing, manufacturing, distributing,
using, selling, or servicing products, or providing services, based on this
document may require intellectual property licenses from third parties for
technology referenced in this document. (2017-10-25, PDF, 978KB, 下载1次)
提出了一种基于电网电流反馈内环和重复控制外环的双闭环控制策略。利用数字控制固有的一拍延时特性，设计了控制系统内环，实现LCL 滤波器的稳定控制；根据内环闭环传递函数特性，设计了相应陷波器、二阶滤波器以及超前环节作为控制系统外环；同时，引入了给定前馈和电网电压前馈控制环节来抑制电网电压对系统的影响，以增强系统的动态性能。理论分析和实验结果表明，该方法使LCL 型并网逆变器具有稳态精度高、动态性能好以及抗干扰能力强的优点。
the repetitive dual closed-loop control strategy based on grid current feedback was proposed in this paper. The LCL filter was stable due to effective utilization of inherent one-beat delay of digital control. Based on the inner closed-loop transfer function, the corresponding notch filter, the second-order filter and lead-link were designed as a compensator of epetitive control. The gird voltage and current reference feed-forward control suppressed grid disturbance and increased dynamic tracking performances. Theoretical analysis and experimental results show that, the proposed method has the advantages of high steady accuracy, fast dynamic response and strong robustness. (2017-10-16, PDF, 1771KB, 下载26次)
时间简史》是由英国伟大的物理学家、黑洞理论和“大爆炸”理论的创立人史蒂芬·威廉·霍金撰写的一本有关宇宙学的经典著作，是一部将高深的理论物理通俗化的科普范本。
A brief history of time by British great physicists, black holes theory and "big bang theory man Stephen William hawking writing a book about the cosmological classic, is a department advanced theory of physical science popularization template (2011-05-08, PDF, 1398KB, 下载6次)
这是一部伟大的书籍.这是英国着名物理学家霍金与美国物理学家姆罗迪诺(Mlodinow)联合撰写的书籍。在书中，霍金否认了宇宙是上帝创造的自我言论.给人以深思.
This is a great books. This is England with the physicist Stephen Hawking s American physicists Mlodinow LuoDiNuo (written) combined with books. In the book, hawking denied that the universe is god created self remarks. Give a person with thinking.
(2011-05-08, PDF, 8290KB, 下载9次)
这个里面详细讲解了关于克里金插值的内容。学习克里金插值必备
Which explain in detail the Kriging interpolation on the content. Essential learning Kriging (2011-03-09, PDF, 827KB, 下载164次)
JZ4755是全球首款双核CPU高清MP4主控方案，是国产CPU技术在消费电子领域的又一次突破性进展。
JZ4755 is the world' s first dual-core CPU HD MP4 master plan, is made CPU technology in the field of consumer electronics, another breakthrough. (2010-09-25, PDF, 316KB, 下载26次)
美国的xenus系列驱动器，双轴伺服放大器
U.S. xenus series drive, dual-axis servo amplifier (2010-05-28, PDF, 1695KB, 下载6次)
电磁波理论，作者：金瓯孔，电磁场领域经典巨作
Electromagnetic Wave Theory,by Jin Au Kong (2009-10-27, PDF, 23510KB, 下载94次)
针对双输入双输出稳定过程,提出一种新的解耦内模控制设计方法。综合解耦和
稳态误差两方面因素,利用对象传递函数模型行列式的静态增益及次对角元素与同行相应主
对角元素之商的不合理部分(即不稳定极点和纯超前部分)的逆来设计控制器
For the two-input dual-output stabilization process, a new decoupling internal model control design methods. Integrated decoupling and steady-state error of two factors, the use of the object transfer function model of the determinant of the static gain and sub-diagonal elements with the corresponding counterparts of the main diagonal elements of the irrational part of the business (ie the unstable poles and pure ahead in part) inverse to design controller (2009-10-20, PDF, 144KB, 下载35次)
1.本文对一种高效的升压式PWM 变换电路作了分析研究 对开关状态的切换效率高 采用双零软开关工作，大大降低了开关损耗, 提
高了电路的转换效率.
2.该电路在高频的开关电源、逆变器等电力电子电路上有很大的实用价值, 可以提高电路的转换效率.
1. In this paper, an efficient step-up PWM conversion circuit analysis study on the switch to switch the state of high efficiency soft-switching double-zero work, greatly reduces switching losses, improve the conversion efficiency of the circuit .2. The circuit in high-frequency switching power supplies, inverters and other power electronic circuits have great practical value, can improve the circuit (2008-10-02, PDF, 152KB, 下载125次)
合适在上海工作的人员申请上海市引进人才居住证．拿到该居住证可交纳四金
Appropriate staff in Shanghai, Shanghai, the introduction of talent to apply for a residence permit. To get the residence permit can be paid four gold (2008-04-02, PDF, 166KB, 下载4次)