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Really learn to understand the transistor primer (classic) __ electronic circuit

not connected to the voltage, in order to ensure that the transistor turn-off, you can add a resistor in the circuit (R2), through the resistor, the base is connected to the 0V. Thus the base is unlikely to present a current. (since no current flows through the R2, the R2 voltage is equal to 0V) without pressure drop. The value of R2 in the actual circuit is 1kω-1mω. Analysis of the transistor's conduction and turn-off When the switch is in a, the existence of the base is very current, then

On the _javascript techniques of JavaScript browser objects

= Test.firstelementchild; The second approach is to use querySelector() and querySelectorAll() , you need to understand the selector syntax, and then use the conditions to get the node, more convenient: Get the node with ID Q1 through Queryselector: var q1 = document.queryselector (' #q1 '); Obtain all nodes in the

Spring boot RABBITMQ integration, delay Message Queuing implementation

com.ks.common.constant.MQConstant; /** * * @author Victor * @desc Hello Message Queuing consumer * /@Component @RabbitListener (queues = Mqconstant.hello_queue_name) Public class Helloprocessor { @RabbitHandler public void Process (String Content) { System.out.println ("Accept message:" + content); } } Inject Service @Autowired private Imessagequeueservice messagequeueservice; Send Message Messagequeueservice.send (mqconstant.hello_queue_na

Django Model filter Conditional filtering

__exact exactly equals like ' AAA ' __iexact precision equals ignoring case ilike ' AAA ' __contains contains like '%aaa% ' __icontains includes ignoring case ilike '%aaa% ', but for SQLite, the effect of contains is equivalent to Icontains. __GT Greater than __gte greater than or equal to __lt less than __lte less than or equal to __in exists in a list range __startswith to ... Beginning __istartswith to ... Start ignoring case __endswith to ... End __iendswith to ... End, ignoring case __rang

Django Model filter Conditional filtering, and multi-table join query, reverse query, a field of distinct

condition is selected Queryset, filter indicates that =,exclude represents! =. Queryset.distinct () to repeat__exact exactly equals like ' AAA '__iexact precision equals ignoring case ilike ' AAA '__contains contains like '%aaa% '__icontains includes ignoring case ilike '%aaa% ', but for SQLite, the effect of contains is equivalent to Icontains.__GT Greater than__gte greater than or equal to__lt less than__lte less than or equal to__in exists in a list range__startswith to ... Beginning__istar

ACTIVEMQ Learning notes-distribution strategy

number of current Windows sizes has been processed, you can continue to send the next windowsize. AdvantagesA good producer will wait until the ACK is returned and then continue sending the message to avoid flooding the traffic. Configure client-side ExceptionsWhen the broker resource is low, it is also one of the options to replace the blocking operation of Send () with a micro-throw exception. When the Sendfailifnospace property is configured to True, the broker throws an javax.jms.ResourceAl

C algorithm and data structure-linear table application, polynomial summation --- ShinePans

) {prev-> A + = current-> A; // why "prev-> coef + = current-> coef" is wrong? Prev-> next = current-> next; free (current); current = prev-> next; continue ;//! Without this sentence, the function will be wrong and report an problem} prev = prev-> next; current = prev-> next;} if (current) {prev = plist-> next; current = prev-> next ;}}/ * // merge the same class void UnitePoly (LNode * h) // merge the same class items {LNode * p1, * p2, * q1, * q2,

C language memory alignment judgment date struct knowledge, alignment

("This year is Leap Year \ n "); // printf ("And today is the % d year's % d day \ n", date. year, date. day); //} // else // {// printf ("This year is not Leap Year \ n "); // printf ("And toda is the % d year's % d day \ n", date. year, date. day); //} // use. operator and-> operator typedef struct A {char a; int B; struct A * pe;} A; typedef struct B {A a; int B; struct A * pc ;} b; struct C // memory alignment {int c; char a; // The preceding address must be an integer multiple of the follo

Install Oracle10G software on AIX

========================================================== ============================================== Rootvg: PV_NAME pv state total PPs FREE DISTRIBUTION Hdisk0 active 542 4 00... 00... 00... 00... 04 ========================================================== ============================================== Datavg: PV_NAME pv state total PPs FREE DISTRIBUTION Hdisk3 active 159 139 32... 22... 21... 32... 32 Hdisk4 active 159 159 32... 32... 31... 32... 32 ====================================

Java self-adding and self-subtraction

1 Public classADD {2 3 Public Static voidMain (string[] args) {4 inti = 0;5i=i++ + + +i;6 intj = 0;7j= ++j + j + + + j + J;8 intK = 0;9k=k++ + k++ + k++ + + +K;Ten intH = 0; OneH=++h + + +h; A intP1=0,p2=0; - intQ1=0,q2=0; -q1=+P1; theq2=p2++; -System.out.println ("I" +i); -System.out.println ("J" +j); -System.out.println ("K" +k); +System.out.println ("H" +h); -System.out.println ("P1" +p1); +Syst

[Data structure] stack and queue

Question 1: Use two queues to implement a stack Ideas: The two queues are Q1 and Q2 respectively. When the stack push operation is called, the elements are directly pushed to queue Q1. the time complexity is O (1 ). When calling the stack pop operation, First push the q1.size ()-1 element in Q1 to Q2, and then pop the

Quaternary element and Rotation

I. Basis of four tuples Q (x, y, z, W), where X, Y, Z is used to determine the rotation axis, W is the Rotation Angle Q = W + Xi + YJ + ZK, I, j, and K are the unit components of the three virtual axes. I * j = K J * k = I; K * I = J; Cross multiplication: C = A × B = | I j k || A1 B1 C1 || A2 B2 C2 |= (B1c2-b2c1, c1a2-a1c2, a1b2-a2b1) C is also a vector, and the length of C is | A | B | sin (theta), perpendicular to the plane where A and B are located. The direction is determined by the right h

Convert real numbers into scores

Convert a real number to a fractional real number that contains rational and irrational numbers. Any rational number can be expressed as P/Q (p, q is an integer, Q! = 0). If the denominator of a score cannot exceed a certain value, a score cannot be accurately expressed for a general rational number or irrational number. We will mainly discuss how to find a pair of scores P1/Q1 and P2/Q2 so that Q1 and Q2 a

Inverted output of the linked list and reverse output of the linked list

Inverted output of the linked list and reverse output of the linked list The inverted output of the linked list, which we may think of, is to flip the linked list and traverse it again. In this case, the time complexity is O (n), but the disadvantage is that the Code is slightly complicated. Or open up an array, traverse a linked list sequentially, copy the elements to the array, and output the array in reverse order. In fact, the time complexity of this question cannot be lower than O (n). Howe

PHP source code encryption imitation micro-shield PHP encryption expert (phpcodelock)

CopyCode Code: function t_rndstr ($ length = "") {// returns a random string $ STR = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz "; If ($ length = ""){ Return str_shuffle ($ Str ); } Else { Return substr (str_shuffle ($ Str),-$ length ); } } $ T_k1 = t_rndstr (); // random key 1 $ T_k2 = t_rndstr (); // random key 2 $ Vstr = file_get_contents ("XK/index. php"); // file to be encrypted $ V1 = base64_encode ($ vstr ); $ C = strtr ($ V1, $ t_k1, $ t_k2); // replace the corresponding chara

Chapter 1 squid Chinese authoritative guide

available to the diskd process. By specifying the value of the Q2 parameter of the cache_dir row, you can configure this limit value:Cache_dir diskd/cache0 7000 16 256 q2 = 50 Second, if the number of queuing operations reaches another limit, squid will stop asking the diskd process to open the file. The default value is 72 messages. If squid wants to open a disk file for reading or writing, but the selected cache_dir has too many unfinished operations, the opening request will fail. When the f

Automatic parallelism in Oracle 11gR2

: 2873591275 Bytes --------------------------------------------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (% CPU) | Time | TQ | IN-OUT | PQ Distrib |Bytes --------------------------------------------------------------------------------------------------------------| 0 | select statement | 14 | 1218 | 2 (0) | 00:00:01 || 1 | px coordinator || 2 | px send qc (RANDOM) |: TQ10000 | 14 | 1218 | 2 (0) | 00:00:01 |

Ex7. Write a queue

#include #includetypedefintQelemtype;typedefstructqnode{qelemtype data; structQnode *Next;} Qnode,*Queueptr;typedefstruct{queueptr front; QUEUEPTR Rear;} Linkqueue;intInitqueue (Linkqueue p) {Q.front= Q.rear = (queueptr)malloc(sizeof(Qnode)); if(! Q.front) Exit (-2); Q.front->next =NULL; return 1;}intEnQueue (Linkqueue Q,qelemtype e) {queueptr P= (queueptr)malloc(sizeof(Qnode)); if(!p) Exit (-2); P->data = E;p->next =NULL; Q.rear->next =p; Q.rear=p; return 1;}intDeQueue (Linkqueue q,qelemtype e)

"Anchor Point"

First Jump: (Jump on the same page, use name to locate)Use the Name property only for the a tag, and other tags such as div cannot be positionedAHref= "#q1"> Problem one?A>AHref= "#q2"> Question two?A>AHref= "#q3"> Problem three?A>Aname= "Q1" > question one Span style= "color: #0000ff;" >a> a name= "Q2" > question two answers aa name= "Q3" > answer to question three a> Second jump: (Jump on the same p

TI launches Simplelink low energy Bluetooth CC2541

TI launches Simplelink low energy Bluetooth CC2541Recently, Texas Instruments (ti) announced the launch of SimplelinkLow Energy Bluetooth (bluetooth®low) CC2541-q1, a highly integrated wireless microcontroller (MCU), Low-power, low-cost, simplified automotive connectivity for emerging smartphone control and wired replacement applications. CC2541-Q1 leverages the following success stories: TI has a broad mar

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