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The circuit board

Xem 1-20 trên 38 kết quả The circuit board
  • Defect detection is recognized to be the most integral criterion for the printed circuit boards (PCBs) quality in industrial manufacturing. The traditional PCB inspection methods have several disadvantages such as time-consuming, labor-intensive, environmental clutter - susceptibility, and inaccurate detection ability. This paper offers a deep learning method for PCB defect detection.

    pdf6p viericschmid 12-01-2022 12 1   Download

  • This problem and its variants can find many other meaningful applications in modern manufacturing systems, such as the robot cell scheduling with computer numerical control machines or printed circuit boards. The idea behind our algorithm may inspire more practical algorithms.

    pdf14p guernsey 28-12-2021 6 0   Download

  • The hydrothermal growing conditions such as temperature and time were investigated by Xray diffractometry (XRD), Raman scattering, as well as Scanning Electron Microscopy (SEM). It is shown that the as-prepared ZnO nanorod was grown well-vertically on the substrate. Furthermore, we investigated the photocatalytic activity of synthesized samples, which showed the enhanced photodegradation ability in the composite sample.

    pdf10p meyerowitz 25-12-2021 7 0   Download

  • In the manufacturing field of sheet products, such as paper, cigarette package, packing box, printed circuit board (PCB), solar silicon chip and so on, the detection of laminated sheet is an essential part. The precision of the counting directly affects the economic benefit of the factory and the subsequent production operation. In order to reduce the high cost and noise in mechanical paper counters, paper counting algorithms based on the gray value difference of paper have been applied and tested to solve these problems based only on vision signals.

    pdf7p quenchua10 18-01-2021 12 1   Download

  • In this work, ZnO nanorods (NRs) were successfully grown on printed circuit board substrates (PCBs) by utilizing a one-step, seedless, low-cost hydrothermal method. It was shown that by implementing a galvanic cell structure in an aqueous solution of 80 mM of zinc nitrate hexahydrate and hexamethylenetetramine, ZnO NRs can directly grow on the PCBs substrate without the assistance of a seed layer. The effect of hydrothermal time on the surface morphologies, and the crystallinity of the as-grown ZnO nanorods (NRs) was also investigated.

    pdf8p 12120609 01-06-2020 5 1   Download

  • Recycling printed circuit boards (PCBs) is an important solution not only to treat hazardous waste but also to recover valuable materials. This research focus on optimizing the leaching copper process from waste PCBs to recycle. This process was performed in Fe2(SO4)3 solution at room temperature and using H2O2 as an oxidant. For optimization, response surface methodology was used to investigate the different parameters, including Fe2(SO4)3 concentration, volume of H2O2 addition and leaching time.

    pdf7p abcxyz123_02 03-03-2020 8 0   Download

  • The surface inclination angles were 0, 45, 90, 135, and 180. Results showed the Onset of Nucleate Boiling (ONB) heat flux increased with increasing heater orientation from 0 to 90, while early ONB occurred when the heater faced downwards (135 and 180). The nucleate boiling was observed to be unstable at low heat flux (1e21% of CHF) and changed into typical boiling when the heat flux was above 21% of CHF.

    pdf11p minhxaminhyeu3 25-06-2019 8 1   Download

  • In this paper we have designed two new compact Photonic Band Gap Structures, shows the properties of Band stop filters. Photonic Band gap filters are designed on central frequencies 1.7GHz and 2.2GHz. These Photonic filters are stable and observable. Also used photonic band gap structure on the filter surfaces, have been provided information about the increasing bandwidth up to 30% of band stop filters.

    pdf5p byphasse043256 21-03-2019 17 0   Download

  • The process of copper leaching by sulfuric acid solution was studied using experimental planning methods using the simulation software Modde 5.0. The parameters were calculated and simulated to evaluate the effect of the acid concentration, leaching time, and the ratio between the solid and liquid phases on the leaching efficiency. The obtained results by simulation were compared with real experimental results. The obtained results from this study are planning in the actual deployment of the Hanoi Urban Environment One Member Limited Company in Vietnam.

    pdf5p giesumanh 10-11-2018 28 0   Download

  • In this study, the liberation of metals from computer PCBs was conducted in detail by mechanical processes including cutting and crushing. The obtained results demonstrate the distribution metallic and non-metallic component weighs as a function of particle sizes.

    pdf7p cumeo3000 01-08-2018 18 0   Download

  • Results of copper and lead recovery from discarded printing circuit boards (PCB) by acidic dissolution and electrodeposition are presented. A preliminary procedure of the recovery process is proposed with the following steps: disposal of the mounted electrical elements, cleaning, grinding, iron separation for grains screening, metal dissolution, and electrolysis.

    pdf9p cumeo3000 01-08-2018 25 0   Download

  • In this paper, a capacitive sensor based on printed circuit board was designed and fabricated to detect air bubbles that appear in the engine lubricating oil. A three-electrode capacitive sensor structure is designed and simulated for monitoring and estimating amount and size of air bubbles in oil.

    pdf9p jangni 13-04-2018 29 0   Download

  • High quality, high density, and well-aligned zinc oxide (ZnO) nanorods have been synthesized on cost-effective printed circuit board (PCB) substrates via a simple, seedless, onestep, low-temperature hydrothermal method based galvanic cell structure. It was found that the outer diameters of the ZnO nanorods range from 50 nm to 400 nm.

    pdf5p truongtien_09 08-04-2018 29 1   Download

  • Most people look at an electronic circuit diagram, or a printed circuit board, and have no idea what they are. One component on the board, and one little squiggle on the diagram, looks much as another. For them, electronics is a black art, practised by weird techies, spouting untranslatable jargon and abbreviations which make absolutely no sense whatsoever to the rest of us in the real world.

    pdf289p nguyenthai_thinh 16-03-2013 64 20   Download

  • The microcontroller is an exciting new device in the field of electronics control. It is a complete computer control system on a single chip. microcontrollers include EPROM program memory, user RAM for storing program data, timer circuits, an instruction set, special function registers, power on reset, interrupts, low power consumption and a security bit for software protection. Some microcontrollers like the 16F818/9 devices include on board A to D converters.

    pdf320p nguyenthai_thinh 16-03-2013 112 24   Download

  • Today's defense systems incorporate an increasing number of electronic components, intended to enable these systems to be more accurate, more sophisticated, and more effective. Advances in printed circuits and associated interconnection—an integral technology—have enabled this trend, and these advances are expected to continue to enable future combat systems.

    pdf95p camnhung_1 14-12-2012 61 3   Download

  • My first contact with speech coding was in 1993 when I was a Field Application Engineer at Texas Instruments, Inc. Soon after joining the company I was assigned to design a demo prototype for the digital telephone answering device project. Initially I was in charge of hardware including circuit design and printed circuit board layout. The core of the board consisted of a microcontroller sending commands to a mixed signal processor, where all the signal processing tasks— including speech coding—were performed.

    pdf578p camchuong_1 04-12-2012 70 6   Download

  • Personal scale PCB milling machines use one of two processes, a mechanical etching process, or a process in which conductive materials are sprayed onto a base board. The mechanical etching process on a desktop circuit maker involves a rotating milling bit that mechanically etches out the desired circuit design onto a copper circuit board. Both etching and spraying techniques enable users to create multi-layer and finely detailed PCBs.

    pdf0p quynho77 13-11-2012 38 1   Download

  • The relationship between the manufacturers of electronic components and the assemblers of electronic circuitry resembles that between two different orders of living beings, for example insects and plants: they need one another to be able to exist, and for that reason there are close links between the evolutionary paths of both. The shapes and the dimensions of their bodies, or respectively their functions, must match one another, so that whatever is needed to ensure the survival of either species can be properly performed. Any mistakes or mismatches are punished by extinction....

    pdf389p beobobeo 01-08-2012 110 23   Download

  • The increasing percentage of digital designers and digital layout experts in the engineering population reflects the directions that our industry is headed. Although the emphasis on digital design is providing significant advances in electronics end products, there is still and will always be a portion of circuit design that interfaces with the analog or real world. There is some similarity in layout strategies between these two domains, but the differences can make an easy circuit layout design less than optimum when trying to achieve good results.

    pdf32p beobobeo 01-08-2012 77 3   Download

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