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This library has been written to generate a SVG image of QR Code in Node.js, goals: pure JavaScript. no browser requirement. no external dependencies. generate SVG output.

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6 Oct 2018 ... The library is designed first in Java and then ported to JavaScript, TypeScript, Python, C++, C, and Rust. It is open source under the MIT ...

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Warpage Issues The impact of warpage on a PWB assembly is multifaceted. First, warpage must typically be overcome when a PWB is placed in a card cage. Card cage placement of warped boards results in a rapid change in the loading of the solder joints that may lead to micro-crack formation or, in severe instances, solder joint fracture. Severe PWB warpage may create a card that physically cannot be placed in a card cage, resulting in a non-manufacturable product. Warped boards should be clamped in a controlled fashion to reduce the stress imparted to solder joints upon installation in a card cage. 58.3.5.1 Effect of Lead-Free Conversion. With the conversion to lead-free, it is imperative to ensure that the base material used in the PWB is compatible with the higher reflow temperatures. While more industry wide research is needed, the use of materials such as Dicyandiamide (DICY) cured FR-4 appears to be limited to applications with less than 240 C peak reflow temperature, whereas Phenolic cured PWBs are preferred for applications higher

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Creating and Reading QR Codes with Node.js | www ...
Oct 25, 2018 · A QR Code is a 2-dimensional bar code. They're generally used to encode a URL so someone can just scan the code and visit a site.

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zxing/zxing: ZXing ("Zebra Crossing") barcode scanning ... - GitHub
ZXing ("Zebra Crossing") barcode scanning library for Java , Android .... The project is in maintenance mode, meaning, changes are driven by contributed patches. ... The Barcode Scanner app can no longer be published, so it's unlikely any changes will be accepted for it. ... QR code is trademarked by Denso Wave, inc.

than 240 C This is because of the better resistance to delamination observed for the phenolics after multiple reflows7, 8 The thermal mass of the components and the amount of copper in large panel boards could make it difficult to maintain temperatures below 240 C Detailed temperature measurements and reflow profiling should be performed on large boards to ensure that the temperature rise across the PWB is compatible with the PWB material 5836 Die and Package Stress Issues A second issue associated with board warpage is die and package stress The package experiences an amount of stress as it constrains the PWB from contracting during cooling after reflow If this stress is severe enough, the silicon may crack Also, severe stress may create multiple types of package delamination and/or cracking.

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Java QR Code Generator - zxing example - JournalDev
Today we will look into java QR code generator program . If you are tech and gadget savvy, then you must be aware of the QR code . You will find it everywhere ...

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Read QR Code content with Selenium and zxing – Elias Nogueira ...
16 Feb 2018 ... As we use Selenium WebDriver with Java as programming language the main challenge was find a library (in Java ) to read the QR Code .

The extreme danger here is that a device could pass full first-level qualification (first-level qualification typically consists of thermal cycling, humidity and temperature exposure, extreme-temperature storage, and shock and vibration experiments performed on packaged devices not attached to a PWB) yet suffer from delamination/die cracking due to stresses imparted by a warped PWB This is one of the primary reasons that many packaged IC suppliers and consumers require that secondlevel qualification test vehicles include daisy chains at the first-level interconnect Inclusion of first-level joints or wire bonds allows for the impact of second-level attach on first-level reliability to be assessed simultaneously with second-level solder joint reliability during a second-level qualification9 58361 Effect of Lead-Free Conversion Lead-free conversion exacerbates these potential silicon-level failures.

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Read QR Code content with Selenium and zxing – Elias Nogueira ...
16 Feb 2018 ... Reading a QR Code . The ZXing (“zebra crossing”) is an open-source, multi-format 1D/2D barcode image processing library implemented in Java , with ports to other languages. One of supported 2D format is the QR Code . ... Read the URL through Image.IO and pass it to a BufferedImage.

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Since the assembly is subjected to a higher temperature range than with tin-lead assemblies, there is a higher propensity for early failures due to residual stresses during cool down In addition, there are potential concerns over the effect on low dielectric constant (k) materials in the silicon during second level temperature cycling This is discussed in more detail in Sec 583139 The effect of mold compound and underfill material selection on first-level interconnects is also discussed in more detail in Secs 583135 and 583136 respectively 5837 Back-Side Component Issues A third challenge related to warped PWBs concerns the back-side components in double-sided designs During cool down after reflow, the top of the PWB is restrained from contraction due to the smaller effective CTE of the packaged device.

This can be rewritten as a a + a 2 = 0. Notice that d (a a) = a a + a 2 dt and so we can conclude that a a = C, where C is a constant. Writing this out, we nd a da =C dt a da = C dt

This results in the bottom side of the PWB over contracting during cool down The state of stress on the bottom solder joints due to warpage may be severe enough to fail solder joints or crack the die in bottom-side components Additionally, the back-side components may be subject to residual stresses imparted after the second reflow (when the top-side components are attached via SMT) that may impact the long-term reliability of the devices on both sides and their second-level interconnects As a result, it is important to characterize the thermomechanical reliability of the components that are mounted on the back-side by performing temperature cycling qualification..

Solder Joint Geometry Issues Another consequence of severe warpage is the shape of the post-assembly solder joints. Joints can become excessively deformed, such that the cross section is too small to withstand fatigue. Joints can also become compressed or elongated, causing shorts or opens in some cases. Moreover, with significant increases in body sizes of packages, there is a higher propensity for opens or bridges during reflow. For example, a 20 mm body-size package (1mm pitch)

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Java QR Code - Javapapers
11 Oct 2014 ... ZXing ("Zebra Crossing") is the popular API for QR code processing in Java . Its library has multiple components and we will be using the 'core' for QR code creation in our Java example . Following code is example to create a QR code image and read information from a QR code image.

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