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Very powerful PCB wiring technology

check and DRC check are correct, the uncabled area should be ground filled and a large area copper layer should be used as the ground wire, on the Printed Board, the unused parts are connected to the ground as the ground. Or make a multi-layer board, power supply, ground each occupies a layer. -- PCB wiring process requirements ①. Line Generally, the signal line width is 0.3mm (12mil), and the power line width is 0.77mm (30mil) or 1.27mm (50mil ); the distance between the wire and the

Python curses use

() function.PadPad is a special case of window. The pad can be larger than the displayed screen, showing only part of the pad at a time. Creating a pad is simple and requires only a wide height. But refreshing the pad needs to provide the coordinates of some pad displayed o

PHP Encryption and decryption method

function Encrypt ($data, $key) {$prep _code = serialize ($data);$block = Mcrypt_get_block_size (' des ', ' ECB ');if ($pad = $block-(strlen ($prep _code)% $block)) $prep _code. = Str_repeat (Chr ($pad), $pad);}$encrypt = Mcrypt_encrypt (Mcrypt_des, $key, $prep _code, MCRYPT_MODE_ECB);Return Base64_encode ($encrypt);}function Decrypt ($str, $key) {$str = Base64_de

In IE6-8, Date does not support toISOString.

This article mainly introduces the repair method of toISOString is not supported by Date in IE6-8, friends can refer to the Date. prototype. toISOString method is added in ES5, ES3 document does not, as follows This method is not supported in IE6/7/8. You can fix it as follows: The Code is as follows: If (! Date. prototype. toISOString ){Date. prototype. toISOString = function (){Function pad (n) {return n Return this. getUTCFullYear () +

Compatible processing of retina new iPad and general resolution iPad pages

the following CSS: img { width: 200px; height: 200px;} In ipad2 or mini iPad, images are normally displayed. However, in new iPad, one CSS pixel actually has four bitmap pixels, and one is divided into four, obviously not enough, only colorApproximate SelectionTherefore, the image is blurred (©Smashingmagazine )! Therefore, for high-definition display of images on the Retina screen, the original size of the images we need cannot be 200x200 pixels, but 2 times the height, that is, 400x400

PCB Package Size

1/8 W 1206 1/4 W 1210 1/3 W 1812 1/2 W 2010 3/4 W 2512 1 W On the capacitor encapsulation in addition to the above chip encapsulation, the non-polar capacitor, its encapsulation model also has rad type, such as "RAD-0.1" "RAD-0.2", etc, the suffix number indicates the distance between two pad in the encapsulation

PHP reversible encryption/decryption functions

The member systems of many projects require the remember login function. the Function of using cookies is to directly store customer information to cookies, if you write cookies directly, security risks are inevitable. Therefore, if you store cookies after reversible encryption, the function source code is secure. Copy codeThe code is as follows: Function encrypt ($ data, $ key ){ $ Prep_code = serialize ($ data ); $ Block = mcrypt_get_block_size ('Des ', 'ECB '); If ($

PHP reversible encryption/decryption functions

The member systems of many projects require the remember login function. the Function of using cookies is to directly store customer information to cookies, if you write cookies directly, security risks are inevitable. Therefore, if you store cookies after reversible encryption, the function source code is secure. The code is as follows: Function encrypt ($ data, $ key ){$ Prep_code = serialize ($ data );$ Block = mcrypt_get_block_size ('Des ', 'ECB ');If ($

Oracle Database ORA-00354 ORA-00353 ORA-00312 exception handling

:0x1c3euba:0x00000000.002f.21 ext:0x5 spc:0x1334uba:0x00000000.002e.37 ext:0x4 spc:0x788uba:0x00000000.0000.00 ext:0x0 spc:0x0uba:0x00000000.0000.00 ext:0x0 spc:0x0TRN TBL:: From here you can determine that there is a problem with the allocation block record in the Undo segment header, clear KTUXC.FBP.FBP[N].KUBA.KDBA related records, and open the database normally . struct KTUXC kernel transaction undo Xaction Table Control. {. struct KSCN SCN with 3 members. {04148 UB4 bas = 0x9cd2de01 = 313

Matconvnet in Mnist source code analysis

The code for this article comes from matconvnetHere's your own comment on the code:Cnn_mnist_init.mfunctionNET = Cnn_mnist_init (varargin)% Cnn_mnist_lenet Initialize a CNN Similar forMnistopts.usebatchnorm = true;#batchNorm是否使用Opts.networktype =' Simplenn ';#网络结构使用lenet结构opts = Vl_argparse (opts, varargin); RNG (' Default '); RNG (0); f=1/ -; net.layers = {};# define each layer parameter, type is the layer attribute of the network, Stride is the step, pad

Android phone tablet is not mistaken, use fragment to implement compatible mobile phone and tablet program

Remember I was involved in the development of a Huawei project that requires programs to support several terminal devices, including the Android phone and the Android Pad. Then, in order to save people, the company's rogue to let the Android phone and Android pad are developed by our team. At that time, the project team decided to make two versions of the app, a mobile phone version, a

PCB Plate Making Notes Daquan

The original is from: I modify the part according to my needs. Http://blog.sina.com.cn/s/blog_4dfea6e40100u923.html -----Please forward your Electronic design Engineer First-class production from the first-class design, our production can not be separated from your design cooperation, please fully cooperate with the engineers please according to the production process detailed design One, the relevant design parameters: I. Line 1. Minimum line width: 6mil (0.153mm). That is, if less than

My09_mysql specify point-in-time recovery

file is initially-change MASTER to master_log_file= ' mysql-bin.000012 ', master_log_pos= 190;)Recovery readiness**********************************************Fully prepared starting point--Change MASTER to master_log_file= ' mysql-bin.000016 ', master_log_pos=190;Original Library Settings dataUpdate sbtest3 set pad= ' sweep this two microcode, free to receive small gifts ' where id=101;Update sbtest2 set pad

Linux Operations Common commands

(calculate φ)? Echo ' obase=16; ibase=10; 123 ' | BC Binary conversion (decimal to hexadecimal)? echo $ ((0X2DEC)) binary conversion (Hex to decimal) ((Shell Math extension))? Echo ' pad=20; min=64; (100*10^6)/((pad+min) *8) ' | BC more complex calculation, here calculate the maximum faste packet rate? Echo ' pad=20; min=64;Print (100E6)/((

Programmers must have 10 big health equipment! We need to work more healthy! _ Life Health

recommendation here is----sandbags! Tie sandbags to the legs or hands, so take a step on the exercise, countless iterations down, the effect is quite considerable na! Equipment 2: Back Back good When the "waist acid back pain foot cramp", we can not expect every time to take the cover of the cover card high calcium to solve the problem. After all, to find the root cause, as a programmer, sitting on the job every day, it is easy to develop the habit of hunched. So, we have to use the kille

How to draw an ellipse on a geometric artboard

of the ellipse (Figure 2). Figure 2 Ellipse Finish, save and exit. 2. Hold down the SHIFT key, select the point F, choose "Show"-> "Tracking Point", also select the point G and Point C, select "Show"-> "Tracking point." Hold down SHIFT to select Points C and segment AB, select "Edit"-> "Action class button"-> "Animation", pop-up "Matching path" dialog box, select "Two-way", "along line segment J", "Slowly", press the "animation" button to complete the setup. An animation button

Implementation method of DES encryption and decryption in PHP and. NET _php instance

->key); Mcrypt_generic_init ($TD, $key, $IV); $ret = Trim (Mdecrypt_generic ($TD, Base64_decode ($value)); $ret = $this-GT;UNPADDINGPKCS7 ($ret); Mcrypt_generic_deinit ($TD); Mcrypt_module_close ($TD); return $ret; } Private Function PaddingPKCS7 ($data) { $block _size = mcrypt_get_block_size (' TripleDES ', ' CBC '); $padding _char = $block _size-(strlen ($data)% $block _size); $data. = Str_repeat (Chr ($padding _char), $padding _char); return $data; } Private Function UnPadd

Use Droupout layer in Caffe to improve accuracy of Cifar10 picture set 10% (0.62 to 0.72)

\\b_datacreate\\mean.binaryproto"} data_param {source: "D:\\Caf feinfo\\b_datacreate\\train_db "Batch_size:50 Backend:lmdb}}" layer {name: "Cifar" type: "Data" Top: " Data "Top:" label "include {phase:test} transform_param {mean_file:" D:\\caffeinfo\\b_datacreate\\mean . Binaryproto "} data_param {Source:" d:\\caffeinfo\\b_datacreate\\val_db "batch_size:50 Backend:lmdb }} layer {name: "CONV1" type: "Convolution" bottom: "Data" Top: "Conv1" param {lr_mult:1} param { Lr_mult:2} convol

PCB design of crystal oscillator circuit

crystal oscillator must be grounded, the outward radiation of the crystal oscillator, and the interference of the external signal to the crystal oscillator can also be shielded. 5. Do not wire under the crystal oscillator, to ensure full paving, while in the Crystal Oscillator 300mil range do not wiring, this can prevent crystal interference other wiring, devices and layer performance. 6. Clock signal traces should be as short as possible, the line is wider, in the wiring length and away from

Use and testing of "Sphinx" Mysql+sphinx full-Text Search

, default is 3306sql_query= \SELECT userid as ID, \K, \C, \Pad \From Sbtest1 \where C like '%03679578678% ' \Sql_attr_uint = k #数据类型int或者timestampSql_field_string = C #数据类型text或者stringsql_attr_string = Pad #数据类型string}Index Sbtest1{Source= Sbtest_sbtest1Path=/var/lib/sphinx/sbtest1 #索引文件的路径}Index TESTRT{type= RTrt_mem_limit= 128MPath=/VAR/LIB/SPHINX/TESTRTrt_field= Titlert_field= Contentrt_attr_uint= GID}In

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