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基于PIC單片機的脈沖電源:設計了一種金屬凝固過程用脈沖電源。該電源采用PIC16F877作為主控芯片，實現對窄脈沖電流幅值的檢測，以及時電流脈沖幅值根據模糊PID算法進行閑環控制。使用結果表明：該電源的輸出脈沖波形良好，電流幅值穩定，滿足合金材料凝固過程的工藝要求且運行穩定可靠。關鍵詞：脈沖電源；PIC16F877單片機；模糊PID；閑環控制 Abstract：A kind of pulse power supply was designed which uses in the metal solidification process ．．I11is power supply used PIC16F877 to take the master control chip reali on to the narrow pulse electric current peak-to-peak value examination，carried on the closed-loop control to the electric current pulse peak-to-peak value basis fuzzy PID algorithm．The use result indicated ，this power supply output se profile is good，and the electric current peak-to-p~k value is stable，It satisfies the alloy material solidification process the technological requirement and movement stable reliable，Key words：p se po wer supply；PIC16F877single-chip microcontroller；f r PID；closed-loop control
上傳時間： 2013-10-27
上傳用戶：xcy122677
We offer a broad line of high performance low dropout (LDO) linear regulators with fasttransient response, excellent line and load regulation, and very wide input voltage rangefrom 0.9V to 100V. Output currents range from 20mA to 10A, with positive, negative andmultiple output versions available. Many devices offer output voltage operation <0.8V andsome feature operation as low as 0V, even with a single supply. Most are stable with ceramicoutput capacitors. LDO regulators can be applied in virtually any application.
上傳時間： 2013-11-15
上傳用戶：努力努力再努力
Frequently, voltage reference stability and noise defi nemeasurement limits in instrumentation systems. In particular,reference noise often sets stable resolution limits.Reference voltages have decreased with the continuingdrop in system power supply voltages, making referencenoise increasingly important. The compressed signalprocessing range mandates a commensurate reductionin reference noise to maintain resolution. Noise ultimatelytranslates into quantization uncertainty in A to D converters,introducing jitter in applications such as scales, inertialnavigation systems, infrared thermography, DVMs andmedical imaging apparatus. A new low voltage reference,the LTC6655, has only 0.3ppm (775nV) noise at 2.5VOUT.Figure 1 lists salient specifi cations in tabular form. Accuracyand temperature coeffi cient are characteristic ofhigh grade, low voltage references. 0.1Hz to 10Hz noise,particularly noteworthy, is unequalled by any low voltageelectronic reference.
上傳時間： 2013-10-30
上傳用戶：wxhwjf
java 開發的郵件服務器平臺。支持以下協議。 協議可以修改為自己的專門標識，這個版本絕對能用，我自己的郵件服務器就是使用這個開源項目，修改后架設的，據說21cn也是用這個引擎開發的郵件系統。SMTP轉發的時候需要二次開發。 Item Status Since First released SMTP server stable 1.0 0.95 Mailet Engine stable 1.2 0.95 FileSystem mailboxes/spool stable 1.2 1.0 RDBMS mailboxes/spool stable 1.2 1.2 POP3 server stable 1.1 1.0 RDBMS - Users stable 1.2.1 1.2.1 LDAP Support - Users Experimental 1.2 1.2 TLS Support - POP3 Experimental 1.2 1.2 Remote Manager stable 1.0 1.0 TLS Support - Remote Manager stable 1.2 1.2 NNTP server Experimental 1.2 1.2 FetchPOP Experimental 2.1 2.1
上傳時間： 2014-01-19
上傳用戶：zhouchang199
項目描述: Env_audit is a program that ferrets out everything it can about the environment. It looks for process IDs, UID, GID, signal masks, umask, priority, file descriptors, and environmental variables. It comes with test configurations for anacron, apache, atd, crond, GDB, inittab, logrotate, PHP, pppd, procmail, rsh, rxvt, sendmail, SSH, stunnel, sudo, xinetd, and xterm. env_audit是一個搜索有關環境的所有東西的程序。它查詢進程IDs，UID, GID,信號掩碼，umask,優先權，文件描述符，和環境變量。它提供了用于anacron, apache, atd, crond, GDB, inittab, logrotate, PHP, pppd, procmail, rsh, rxvt, sendmail, SSH, stunnel, sudo, xinetd, 和xterm的測試配置。 類別: Development Status: 5 - Production/stable Environment: Console (Text Based) Intended Audience: System Administrators License: GNU General Public License (GPL) Operating System: POSIX Topic: Security
標簽： environment everything Env_audit ferrets
上傳時間： 2013-12-02
上傳用戶：qweqweqwe
Eclipse是開放源代碼的項目，你可以到www.eclipse.org去免費下載Eclipse的最新版本，一般Eclipse提供幾個下載版本：Release，stable Build，Integration Build和Nightly Build，建議下載Release或stable版本，筆者用的是Build20020125（stable版本）。Eclipse本身是用Java語言編寫，但下載的壓縮包中并不包含Java運行環境，需要用戶自己另行安裝JRE，并且要在操作系統的環境變量中指明JRE中bin的路徑。安裝Eclipse的步驟非常簡單：只需將下載的壓縮包按原路徑直接解壓既可。
上傳時間： 2014-01-24
上傳用戶：xiaohuanhuan
1.刪除了大部分重復代碼，將顯示表格的代碼集中到了FTable.asp和stable.asp兩個文件中， 便于用戶修改表格的樣式. 2.上一版本中系統可以顯示如：2001-2-29 2001-4-31 等不存在的日期報表. 此版修正了這個錯誤. 3.修改了本周統計中包含其它周統計數據的錯誤. 4.增加全部年統計分析,不過好象沒什么用處 :-) 5.增加了無數據時的信息提示. 6.增加幾種顯示樣式. 7.可以設置網站所在地區,每頁顯示行數,刷新間隔等參數.
上傳時間： 2014-11-22
上傳用戶：ruixue198909
The cable compensation system is an experiment system that performs simulations of partial or microgravity environments on earth. It is a highly nonlinear and complex system.In this paper, a network based on the theory of the Fuzzy Cerebellum Model Articulation Controller(FCMAC) is proposed to control this cable compensation system. In FCMAC ,without appropriate learning rate, the control system based on FCMAC will become unstable or its convergence speed will become slow.In order to guarantee the convergence of tracking error, we present a new kind of optimization based on adaptive GA for selecting learning rate.Furthermore, this approach is evaluated and its performance is discussed.The simulation results shows that performance of the FCMAC based the proposed method is stable and more effective.
標簽： system compensation simulations experiment
上傳時間： 2015-08-26
上傳用戶：希醬大魔王
Securing Apache 2: Step-by-Step When choosing a web server, Apache very often wins against its competitors because of stability, performance, that fact that it s open source, and many other advantages. But when deciding on which version of Apache to use, the choice is not always so simple. On the one hand there is a very popular, stable version used by millions of users, version 1.3, and on the other hand, there is an enhanced and re-designed version 2.0.
標簽： Apache Step-by-Step Securing choosing
上傳時間： 2015-09-06
上傳用戶：gundamwzc
Linux in a Nutshell, 5th Edition By Stephen Figgins, Robert Love, Arnold Robbins, Ellen Siever, Aaron Weber ... ... ... ... ... ... ... ..... Publisher: O Reilly Pub Date: July 2005 ISBN: 0-596-00930-5 Pages: 944 Over the last few years, Linux has grown both as an operating system and a tool for personal and business use. Simultaneously becoming more user friendly and more powerful as a back-end system, Linux has achieved new plateaus: the newer filesystems have solidified, new commands and tools have appeared and become standard, and the desktop--including new desktop environments--have proved to be viable, stable, and readily accessible to even those who don t consider themselves computer gurus.
標簽： Nutshell Edition Figgins Stephen
上傳時間： 2015-12-03
上傳用戶：frank1234
