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PCI-Express接口的PCB布线规则

1.阻抗要求 PCI Express的接口走线阻抗在4层或6层板时必须保持100差分（±20％ MAX）/60单端 ±15% 。 2.线宽和线距通过阻抗计算软件，结合PCB叠层情况，计算出合理的走线线宽和线距。比如，微带线情况下，差分线的宽度为5mil，差分对中2条走线的间距是7mil。（带状线...
2022-07-07 21:51【ltqshs】
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三问TDM

前言提前声明，这里的“问”不是质疑，而是请教，免得再有人骂我是喷子。久闻阿里TDM召回的大名，文章也读了好久了。TDM打破了传统召回中，user侧与item侧必须隔离解耦建模的限制（没错，双塔，说的就是你），使item对user history进行Attention这样的交叉结构也能被应用...
2022-07-07 21:51【kaiyuan_sjtu】
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违法行为分析1

spark sql select tt1.tjrq ,tt1.dr sgs ,tt1.jn sgs ,tt1.qntq sgs ,tt1.dr swsgs ,tt1.jn swsgs ,tt1.qntq swsgs ,tt1.dr swrs ,tt1.jn swrs ,tt1.qntq swrs ,...
2022-07-07 21:51【小胖超凶哦！】
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深入理解Mysql锁与事务隔离级别

目录 Mysql事务及ACID特性详解 Mysql%E4%BA%8B%E5%8A%A1%E5%8F%8AACID%E7%89%B9%E6%80%A7%E8%AF%A6%E8%A7%A3 概述 %E6%A6%82%E8%BF%B0 事务及其ACID属性 %E4%BA%8B%E5%8A%A1%E5%8...
2022-07-07 21:51【打分几楼MOTO】
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Mysql索引优化实战二

目录分页查询优化详解 %E5%88%86%E9%A1%B5%E6%9F%A5%E8%AF%A2%E4%BC%98%E5%8C%96%E8%AF%A6%E8%A7%A3 常见的分页场景优化技巧 %E5%B8%B8%E8%A7%81%E7%9A%84%E5%88%86%E9%A1%B5%E5%9C%...
2022-07-07 21:51【打分几楼MOTO】
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Mysql索引优化实战一

目录综合案例 %E7%BB%BC%E5%90%88%E6%A1%88%E4%BE%8B 联合索引第一个字段用范围不会走索引 %E8%81%94%E5%90%88%E7%B4%A2%E5%BC%95%E7%AC%AC%E4%B8%80%E4%B8%AA%E5%AD%97%E6%AE%B5%E7%9...
2022-07-07 21:51【打分几楼MOTO】
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LDO voltage stabilizing chip - internal block diagram and selection parameters

In electronic design , We often need to use different DC voltages to power different devices , One of the most used is through LDO Voltage stabilizin...
2022-07-07 23:19【ltqshs】
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Ros2 topic (03): the difference between ros1 and ros2 [01]

1 summary future ROS2 Will become more and more popular , and ROS1 About to exit history ; millet 、 Huawei is widely used ROS2 了 , However...
2022-07-07 23:19【Mr anhydrous】
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Ros2 topic (03): the difference between ros1 and ros2 [02]

7 summary Continued above ： ROS2 project （03）：ROS1 and ROS2 The difference between 【01】 'ROS2 project （03）：ROS1 and ROS2 The difference ...
2022-07-07 23:19【Mr anhydrous】
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Vulnerability recurrence ----- 49. Apache airflow authentication bypass (cve-2020-17526)

List of articles One 、Apache Airflow brief introduction Apache Airflow 7 Two 、 Causes of loopholes 13 3、 ... and 、 Loophole recurrence 27 On...
2022-07-07 23:19【Seven days】
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Tree background data storage (using webmethod) [easy to understand]

Hello everyone , I meet you again , I'm the king of the whole stack . Tree backstage data Storage The background data storage will be explai...
2022-07-07 23:20【Full stack programmer webmaster】
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Count the top 10 films at the box office and save them in another file

Hello everyone , I meet you again , I'm the king of the whole stack . Today I saw a written test question , It's this ： Given a file m.dat . It sav...
2022-07-07 23:20【Full stack programmer webmaster】
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Cloud native data warehouse analyticdb MySQL user manual

Control flow function Cloud native data warehouse AnalyticDB MySQL edition Alibaba cloud detail/120505.html ' Control flow function Cloud n...
2022-07-07 23:20【Little mouse's test diary】
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Freelink open source call center design idea

Hello everyone , I meet you again , I'm the king of the whole stack . The last article probably talked about the excellent call center systems at ho...
2022-07-07 23:20【Full stack programmer webmaster】
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Coreseek: the second step is index building and testing

Hello everyone , I meet you again , I'm the king of the whole stack . 1, Indexing is very easy. One line of code g:/service/coreseek/bin/indexer c g...
2022-07-07 23:20【Full stack programmer webmaster】
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Experience sharing of system architecture designers in preparing for the exam: the direction of paper writing

One 、 Amount of exercises Comprehensive knowledge multiple choice questions ： 350 Tao architecture every day 10 Practice （35 God ）、250 The way is d...
2022-07-07 23:20【weixin_ forty-six million six hundred and nineteen thousand two】
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JS get the key and value of the object

js Get the object's key and value Get the object's keys Array ： Object.keys obj Get the object's values Array ： Object.values obj let obj = { ...
2022-07-07 23:20【Blue fatty's Dora A Dream】
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Turbo introder common scripts

Blasting user name and password from urllib import quote def user password brute target, engine : for password in open 'D: crypto mutou fuzzDicts p...
2022-07-07 23:21【b1ackc4t】
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MATLAB signal processing [Q & A essays · 2]

1. Matlab Simple interpolation 、 Fitting method 1 Matlab 1 2. Digital signal processing experiment ——FIR Filter design 2 FIR 43 3. Matlab Why is ...
2022-07-07 23:21【Goose feather is on the way】
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PHP uses Alibaba cloud storage

Alibaba cloud object storage website Alibaba cloud object storage website detail/85580.html Install alicloud sdk Use composer Install or use ...
2022-07-07 23:21【Code is a bug】
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