نتایج جستجو برای: printed circuit boards pcbs

تعداد نتایج: 155450  

2015
Jorge Enrique Madrigal-Arias Rosalba Argumedo-Delira Alejandro Alarcón Ma. Remedios Mendoza-López Oscar García-Barradas Jesús Samuel Cruz-Sánchez Ronald Ferrera-Cerrato Maribel Jiménez-Fernández

In an effort to develop alternate techniques to recover metals from waste electrical and electronic equipment (WEEE), this research evaluated the bioleaching efficiency of gold (Au), copper (Cu) and nickel (Ni) by two strains of Aspergillus niger in the presence of gold-plated finger integrated circuits found in computer motherboards (GFICMs) and cellular phone printed circuit boards (PCBs). Th...

2001

Circuitry that may be built into an integrated circuit to assist in the test, maintenance, and support of assembled printed circuit boards is defined. The circuitry includes a standard interface through which instructions and test data are communicated. A set of test features is defined, including a boundary-scan register, such that the component is able to respond to a minimum set of instructi...

2001

Circuitry that may be built into an integrated circuit to assist in the test, maintenance, and support of assembled printed circuit boards is defined. The circuitry includes a standard interface through which instructions and test data are communicated. A set of test features is defined, including a boundary-scan register, such that the component is able to respond to a minimum set of instructi...

Journal: :Electronics 2023

Printed circuit boards (PCBs) are extensively used to assemble electronic equipment. Currently, PCBs an integral part of almost all products. However, various surface defects can still occur during mass production. An enhanced YOLOv5s network named YOLO-MBBi is proposed detect on address the shortcomings existing PCB defect detection methods, such as their low accuracy and poor real-time perfor...

Journal: :Recycling 2021

Reclamation of printed circuit boards (PCBs) to recover metals is gaining growing attention due minerals being non-renewable resources. Currently, extraction from PCBs through an efficient and green method still under investigation. The present investigation concerns the recycling using hydrometallurgical processes. First, basic (Cu, Ni, Zn Fe) were separated a sulfuric acid solution at moderat...

Journal: :ACS Sustainable Chemistry & Engineering 2022

The conversion of plastic wastes into benzene, toluene, and xylenes (BTX) is a promising strategy to achieve circular economy carbon neutrality. Here, the ex situ catalytic fast pyrolysis epoxy-printed circuit boards (PCBs) waste tires (WTs) was studied using hierarchical ZSM-5 zeolites biochar (BC). results show that alkali–acid treatment created micromesoporous structures with higher specific...

2012
Ricardo Montero Alicia Guevara Ernesto de la Torre

Nowadays, over 300 tons of Au are used in electronic equipment each year with other precious and strategic metals such as Ag, Pt, Pd, Cu, Nb, Ta, etc.. After the use-phase, the electronic devices become electronic waste (e-waste); consequently it is important to consider e-waste as a secondary supply for the recovery of these metals. This paper presents the recovery of Au, Ag, Cu and Nb from PC...

Journal: :Metals 2022

Various metals and semiconductors containing printed circuit boards (PCBs) are abundant in any electronic device equipped with controlling computing features. These devices inevitably constitute e-waste after the end of service life. The typical construction PCBs includes mechanically chemically resistive materials, which significantly reduce reaction rate or even avoid accessing chemical reage...

Journal: :World Journal Of Advanced Research and Reviews 2022

Natural minerals are a powerful tool in politics when some have major role production. Its depletion is now hot topic worldwide. Thus, the safety of environment, natural surface water, groundwater and protection soils from chronic contamination by metallic inorganic elements global concern. Indeed, industrialization development led to generation huge varied amounts waste, including electronic w...

Journal: :Eureka: Physics and Engineering 2022

Inspection of defects in the printed circuit boards (PCBs) has both safety and economic significance 4.0 industrial manufacturing. Nevertheless, it is still a challenging problem to be studied in-depth due complexity PCB layouts shrinking down tendency electronic component size. In this paper, real-time automated supervision algorithm proposed test PCBs quality among different scenarios. The de...

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