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Abstract

With advancing technology, printed circuit board (PCB), one of the most important components of ewaste, has become a source of pollution due to an ineffective waste management system. This problem can be solved by converting PCB waste into a valuable product which will emerge to maximize the renewable energy supplies. In this aspect, co-pyrolysis is advantageous in both simple and successful in producing high-quality pyrolysis oil. In this paper, cotton stalk (CS) as biomass was used and pyrolysis of PCB, CS, and a mixture of both in 1:1 have been carried out. CS has a good combustibility at 500°C which was chosen for the pyrolysis reaction in a fixed bed reactor for slow pyrolysis. The pyrolytic oil was analysed by GC–MS and FTIR. The results indicate that there is an increase in oil yield from 19.6% to 27.5% by weight and phenol and phenolic compounds in oil of co-pyrolysis from 60.94% to 76.82% compared to literature available. There is an increase in bromine solidification in char by 25% with a mixture of CS and PCB compared to CS and PCB individually which is much higher than literature data. To the best of the authors’ knowledge, co-pyrolysis of PCB:CS has been attempted first time and debromination of oil was found excellent in the present work.
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Authors and Affiliations

Sonalben B. Prajapati
1 2
Alok Gautam
3 2
Shina Gautam
3 2

  1. Government Engineering College, Chemical Engineering Department, Bhuj- 370001, Gujarat, India
  2. Gujarat Technological University, Chandkheda, Ahmedabad, 382424 Gujarat, India
  3. Shroff S. R. Rotary Institute of Chemical Technology, Chemical Engineering Department, Bharuch-393135, Gujarat, India
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Abstract

The aim of this study was to examine the pollution level of polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) and selected chloroorganic pesticides (HCH isomers, DDT and its metabolites, aldrin, dieldrin, endrin, heptachlor, endosulfan I and II, and methoxychlor) in surface sediments from selected fjords, tidal plains and lakes from the North Svalbard area. The sediments were collected from 34 sampling stations in July 2005. Only endosulfan I and methoxychlor, among selected chloroorganic pesticides, were measured in concentrations near detection limit (LoD) in fourteen sediment samples. The sum of seven PCB congeners varied from < 0.9 to 5.6 ng g-1 d.w. in sediments from fjords and tidal plains and from < 0.1 to 14.6 ng g-1 d.w. in sediments from lakes. The concentrations of analysed PAH compounds in surface sediments from lakes were over ten times higher (Ʃ16PAHs to 429 ng g-1 d.w.) than in sediments from fjords and tidal plains (Ʃ16PAHs to 36 ng g-1 d.w.).

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Authors and Affiliations

Grażyna Sapota
Barbara Wojtasik
Dorota Burska
Kamil Nowiński
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Abstract

Presence of heavier molecules and toxic brominated compounds in pyrolysis products of printed circuit boards (PCB) make their use difficult. In the present work to overcome this problem PCBs were pyrolyzed in presence of catalysts such as ZSM-5 and Ca(OH)2 to study their effect on pyrolysis products. The comparison of non-catalytic pyrolysis of PCB was done with oil and gas compositions produced by both techniques. Pyrolysis experiments were done at a lab scale set-up. However, the increased concentrations of ZSM-5 were found to increase char and gases were found to be rich in CH4 and O2. The composition of oils was mainly composed of phenols, phenol derivatives and aromatic compounds, which increased with pyrolysis with ZSM-5 and Ca(OH)2. Ca(OH)2 was found effective in removing brominated compounds from oil and no halogens were observed in oil. Char produced during pyrolysis was mesoporous in nature and composed of some fractions of metals and glass fibers.
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Authors and Affiliations

Vaibhav Pandere
1 2
Alok Gautam
1 2
Shina Gautam
1 2

  1. Chemical Engineering Department, Shroff S. R. Rotary Institute of Chemical Technology, Bharuch-393135, Gujarat, India
  2. Gujarat Technological University, Chandkheda, Ahmedabad-382424 Gujarat, India
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Abstract

As we enter the 5G (5th-Generation) era, the amount of information and data has become increasingly tremendous. Therefore, electronic circuits need to have higher chip density, faster operating speed and better signal quality of transmission. As the carrier of electronic components, the design difficulty of high-speed PCB (Printed Circuit Board) is also increasing. Equal-length wiring is an essential part of PCB design. But now, it can no longer meet the needs of designers. Accordingly, in view of the shortcomings of the traditional equal-length wiring, this article proposes two optimization ways: the ”spiral wiring” way and the ”double spiral wiring” way. Based on the theoretical analysis of the transmission lines, the two optimization ways take the three aspects of optimizing the layout and wiring space, suppressing crosstalk and reducing reflection as the main points to optimize the design. Eventually, this article performs simulation and verification of schematic diagram and PCB of the optimal design by using HyperLynx simulation software. The simulation results show that these two ways not only improve the flexibility of the transmission line layout, but also improve the signal integrity of the transmission lines. Of course, this also proves the feasibility and reliability of the two optimized designs.
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Bibliography

[1] Gong Yonglin. The hot spots of printed circuit technology in 2020. Printed Circuit Information, 28(2):1–11, 2020.
[2] Myeonghoon Oh, Youngwoo Kim, Hag Young Kim, Young Kyun Kim, and Jinsung Kim. Wire optimization and delay reduction for highperformance on-chip interconnection in gals systems. Etri Journal, 39(4):582–591, 2017.
[3] YuanWei-Qun, Song Jian-Yuan, Chen Shi-Rong, Suntak Technology Co, and LTD. Research and optimization design of high-speed pcb based on signal integrity. Journal of Guangdong University of Technology, 36(6):74–79, 2019.
[4] L.W.; Zhao Z.L. Yang, C.Z.; De. Research on signal integrity in high speed digital pcb board design. Automation and Instrumentation, (9):1– 4, 2018.
[5] YuanWei-Qun, Song Jian-Yuan, Chen Shi-Rong, Suntak Technology Co, and LTD. Research and optimization design of high-speed pcb based on signal integrity. Journal of Guangdong University of Technology, 36(6):74–79, 2019.
[6] Zhang Min. Signal integrity and design optimization of high speed parallel bus interface. Wireless Internet Technology, 15(6):3–4, 2019.
[7] Nastaran Soleimani, Mohammad G H Alijani, and Mohammad Hassan Neshati. Crosstalk analysis of multi-microstrip coupled lines using transmission line modeling. International Journal of Rf and Microwave Computer-aided Engineering, 29(6), 2019.
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[12] Nastaran Soleimani, Mohammad GH Alijani, and Mohammad H Neshati. Crosstalk analysis at near-end and far-end of the coupled transmission lines based on eigenvector decomposition. AEU-International Journal of Electronics and Communications, 112:152944, 2019.
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[18] Nastaran Soleimani, Mohammad GH Alijani, and Mohammad H Neshati. Crosstalk analysis of multi-microstrip coupled lines using transmission line modeling. International Journal of RF and Microwave Computer-Aided Engineering, 29(6):e21677, 2019.
[19] S. M¨uller, T. Reuschel, R. Rimolo-Donadio, Y. H. Kwark, H. Br¨uns, and C. Schuster. Energy-aware signal integrity analysis for high-speed pcb links. IEEE Transactions on Electromagnetic Compatibility, 57(5):1226– 1234, 2015.
[20] Jie Tang, Yi Gong, and Zhen Guo Yang. Failure analysis on cracking of blind and buried vias of printed circuit board for high-end mobile phones. Soldering and Surface Mount Technology, 31(4), 2019.
[21] Liu Lu, Cao Yuesheng, and Duo Ruihua. Design and realization of high-density fdr interconnection switch board. Computer Engineering, (6):3, 2016.
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Authors and Affiliations

Kaixing Cheng
1
Zhongqiang Luo
1
Xingzhong Xiong
1
Xiaohan Wei
1

  1. Artificial Intelligence Key Laboratory of Sichuan Province, Sichuan University of Science and Engineering, Yibin, China
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Abstract

Contents of PCBs was investigated using the gas chromatography method in the tissue of four Antarctic migratory birds: Oceanites oceanicus, Larus dominicanus, Catharacta skua and Sterna vittata, and the three penguin species: Pvgoscelis adeliae, P. papua and P. antarctica. Samples were collected at King George Island in February 1978 and, for comparison, in March 1983. The highest PCBs content was recorded in the adipose tissue of O. oceanicus and C. skua (15.7 and 1.2 ppm). Differences in the content of these compounds in the tissue of various penguin species in 1978 was observed. The mean cumulation level of PCBs in the adipose tissue of penguins was higher in 1983 than in 1978. Differences in the level of PCBs contents in the tissue of migratory birds were related to their winter migrations to areas polluted to various degress with PCBs remains. A tendency to the increase of the contamination of penguin tissues with PCBs was observed. This tendency was related to the increase of vhe pollution of the Antarctic environment with these compounds.

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Authors and Affiliations

Aleksy B. Łukowski
Marek A. Karolewski
Tadeusz Górski

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