Switching power supply Three topologies: Buck,boost,buck-boost. The topology diagram is as follows:BuckBoostδBuck-boostTransformer calculation:One, Buck circuit transformer calculationThe buck Circuit is the most severe inductor operating condition at the highest input voltage;1, first set the following parameters: Input voltage vin, Output voltage iout, operating frequency F;2, because the circuit works in the critical mode, so the inductor peak current of 2Iout;3, duty ratio d=vout/vin;4, by t
[] args) {String S1 = "Monday";String s2 = "Monday"; if (S1 = = s2)System.out.println ("S1 = = s2"); ElseSYSTEM.OUT.PRINTLN ("S1! = s2"); }}Compile and run the program, output: S1 = = S2Description: S1 and S2 refer to the same String object-"Monday"! 2.A little change to the program, there will be more strange discovery: public class TestString {public static void Main (string[] args) {String S1 = "Monday";String s2 = new String ("Monday"); if (S1 = = s2)System.out.println ("S1 = = s2"); ElseSYS
Microsoft Certified Systems Engineer (MCSE)
Learn more about MCSE CertificationThe qualification of a Microsoft Certified System engineer means that Microsoft acknowledges that you have a high level of expertise to analyze business requirements and to design and impleme
file, there can be functions with the same name in these two classes. When referencing, for the sake of distinction, the class masterpiece should be added to the qualification: Class a//Declare Class A {public: void funl ();//Declare the FUNL function in Class A private: NBSP int i; void A::funl () //to define the FUNL function {...} in Class A. The Class b//declares that class B {public: void funl (), and //b classes also have function v
Java generics
keyword Description? wildcard character type Extends t> represents the upper bound of a type, which indicates that a parameterized type may be a subclass of T or T. The super t> represents the lower bound of the type (called a supertype qualifier in the Java core), indicating that the parameterized type is a supertype of this type (the parent type) until the object
extends Sample
Class Food {public static void Main (string[] args) {listlistList.add (New Apple ());List.add (New
procedures, the first one to intercept and to tune up the second actual processed stored procedure.The intercepted stored procedure is from the network:drop procedure if exists pro_deletelog; --exist or deleteCREATE PROCEDURE Pro_deletelog (qualification varchar (100))--Define parametersBegindeclare i int;declare Start1 int;declare Length int;declare totallenght int;DECLARE filed varchar (100);DECLARE sqlstr varchar (2000);DECLARE stmtnovelsearch var
, with the format defined as the type variable placed after the modifier, preceded by the return type. As we can see, the above generic methods can be called for various types of arrays, and while the types of these arrays are known to be finite, they can also be implemented with overloading, but the coding efficiency is much lower. The sample code that calls the above generic method is as follows:String[] strings = {"AA", "BB", "cc"= arrayalg.getmiddle (names);4.
addition, we also need to understand the security of e-commerce systems, electronic finance security, and legal protection issues.E-commerce division qualification and trainingE-commerce division occupations are divided into four levels: E-commerce operator (National Vocational Qualification Level 4), assistant E-Commerce Division (National Vocational Qualification
The profession of IT practitioners in China-computerProgramDesigner (from network)
In fact, I have long wanted to know which jobs in computer science are available. I want to give myself some direction, but the computer is too broad and there are many jobs, so I have never been familiar with it in detail. Today, I finally made up my mind to search for it on the Internet and found that it was so broad as I thought! Let's take a look at the programmers. The information may be incomplete and ther
certification. Different certificates require different knowledge, different social recognition, and different examination methods. To help students understand the types and features of influential Software Test certifications at home and abroad, I chose "ISTQB" based on relevant materials ", "QAI" and "software reviewer" are compared and analyzed.
Authentication NameClassification features
ISTQB
QAI
Chinese software reviewer
Full name
International Software Testin
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