When the solder paste is in a heated environment, the solder paste backflow is divided into five stages,1. First, used to achieve the required viscosity and silk screen performanceThe solvent starts to evaporate and the temperature increases slowly.(About 3 °C per second ),Limit boiling and splash to prevent small tin beadsAnd,Some components are sensitive to internal stress. If the external temperature of
For solder mask Layers and paste mask Layers Two concepts, there are many beginners do not understand the concept of these two layers, because they do have some similarities, on their own view, tribute everyone reference:
Solder Masks Layers: That is, the solder mask layer, is the PCB board (surface patch Pads, plug-in pads, vias) outside a layer of green oil, i
Definition of PCB layer:Solder Mask: Solder masks, refers to the board on the green oil on the part, because it is negative output, so actually there is solder mask part of the actual effect is not on the green oil, but tin plating, silver.
Help solder layer: Paste mask, is the machine to use the patch, is corresponding to all SMD components of the pad, the size
An error occurred in the design rule check (that is, DRC). In my experience, the majority is a safe distance error, that is, the distance between your component and the component or between the wire and the element or between the wire and the wire is less than the set safe distance. You can remove the distance or modify the design rules. If you do not require a safe distance (such as a low operating voltage), you can ignore the DRC layer off will not be green. ---from BaiduPROTEL:
With the 23rd batch of iphone x arriving, around the tyrants have to use up, because the iphone x Liu Qi caused by a lot of adaptation problems, so this group of tyrants more immersed in a variety of find bugs, as expected, the Pea Princess applet in some places also appeared a lost experience bad place, Mainly is the Product Details page and the shopping cart's suction bottom button bar, will overlap with the home indicator horizontal bar, like this,
application range and industry of vacuum suction cupsVacuum Suction cup, also known as Sucker, is one of the vacuum equipment actuators. The layout is more brief, the installation is more convenient, the appearance is beautiful, the suction holding force is strong and so on characteristic. classification of Vacuum suction
The Design and Application of Vacuum suction cups are briefly described:
Theoretical suction F (n) = effective adsorption area (m2) * vacuum degree (kPa)
If the pressure of compressed air is 5MPa MPa, the vacuum generator can generate a vacuum degree greater than 80 kPa. Generally, 70kpa is used for calculation in Engineering.
40 in diameter, the suction cup has
Description: This article selected from the "QQ Group ranking Automatic Suction 1.0" a book, want to see more content please contact the author directly;1. Invalid QQ Group MarketingSpeaking of QQ Group, many people want the most should be the following skills and software, such as:① How to batch add QQ group;② How to bulk mass not be sealed number;③ How to make good relations with the group master, lest send advertisement to be kicked;④ How to extrac
Domestic mobile App Store, more forums, there are quite a lot of stores, forums only need to submit, fill in the information and description after a little can be completed upload, there is no audit, so loose mechanism, just to the hacker made " "Opportunity, they are carefully tricksters, step by step let mobile phone users into the suction trap." Below, we will follow the Love encryption technician to understand the mobile phone
Description: This article selected from the "QQ Group ranking Automatic Suction 1.0" a book, want to see more content please contact the author directly;1. Invalid QQ Group MarketingSpeaking of QQ Group, many people want the most should be the following skills and software, such as:① How to batch add QQ group;② How to bulk mass not be sealed number;③ How to make good relations with the group master, lest send advertisement to be kicked;④ How to extrac
In July 4, 2006 AD, it was the day X after the suction cup decided to leave the company by the end of May. I wandered outside the company hall and met Ji Jun and came to ask me, "Have you ever written anything for a suction cup?" I said "no ". He told me, "You still need to write something. Before the suction cup disappears, you will be confused with you ."
This
I saw several experts on TV this morning and told me that I had to pay for the best operation strategy. I had to pay a cup of tea and put it on his face, I have something better than you. I have seen many TV experts mention high-throttling and Low-suction. But how many of them can achieve high-throttling and Low-suction?It seems that it makes sense to hear the phrase "low buy high sell" from experts. In fac
It is my pleasure to earn RMB 100 a month for daily suction of 3000 million live powder monthly plus 100 million powder operation projects to share the operation idea of passive daily suction of 3000 million powder monthly plus million powder, because this method is really awesome, it is a conservative number to say that the method is to suck 100 million powder a day, because the daily passive addition of f
Funding
Regular upward shock waves often appear in the disc. The main fund suction. Ordinary stocks rarely carry out such powerful attacks.
Slowly seek funding. There are often large sale orders, but they will be quickly removed, or the number of sold tickets is getting fewer and fewer. Often fall below a certain technical support level (such as a moving average), but the stock price has not fallen much. There is often a blank fall in a time-sharing
React operation real DOM Implementation Dynamic bottom suction example, reactdom
Dynamic bottom suction: fixed is displayed on the page at the beginning. When the page is scrolled to a certain distance from the bottom, the fixed part is fixed.
This requires Page scrolling distance calculation. If Jquery or native js is used for implementation, the use of react does not recommend DOM operations, however, if
It is my pleasure to earn RMB 100 a month for daily suction of 3000 million live powder monthly plus 100 million powder operation projects to share the operation idea of passive daily suction of 3000 million powder monthly plus million powder, because this method is really awesome, it is a conservative number to say that the method is to suck 100 million powder a day, because the daily passive addition of f
the card game is eagerly awaiting innovation. Integrated several points, "Three Kingdoms Kill Legend" is basically tailor-made, as the classic card game "Three Kingdoms kill" continuation, it takes into account the needs of the players, the picture style is a lovely q version, the characters dialogue comedy, the plot brain hole open, the whole game comedy, from the first eye firmly grasp the player's eyeball. And as a continuation of the classic card game, "Three Kingdoms Kill legend" does n
planning, the wheat field said it will be mainly used for public promotion and Platform (e-commerce + parent-child service) to improve the function. The wheat field believes that the public dividend decline will play a role in the screening of the marketing number, in fact, the golden age of the development of high-quality content platform, he is confident that in the next 2.5 months time to reach 500,000 fans.Original address: http://www.lindukj.cn/news/archives/759Start-up 3.5, do 8 apps all
Android suction animation effect detailed.
Here, I want to introduce how to achieve a similar effect on Android. First look at the effect I realized.
The above illustration shows a few frames of the animation, from 1-4, which shows the picture being inhaled from the original graphic to a point (red logo).
To achieve this effect, we took advantage of the Canvas.drawbitmapmesh () method, which involves the concept of a mesh.
The concept of 2,mesh
Me
I believe many people have done this drainage play, but the effect is still very OK. The article we shared today is very brief, but it is real deal dry, and there are friends who need to use this method to drain the article.I'd say this fan. Fission principle: Mainly through free mobile 500M traffic as bait, using this bait to drive fans to help us to promote, to achieve a snowball-type suction powder. (500m traffic using the software to pick up, we d
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