The status and development of treatment techniques of typical waste electrical and electronic equipment in China: A review

2014 ◽  
Vol 32 (4) ◽  
pp. 254-269 ◽  
Author(s):  
Yunxia He ◽  
Zhenming Xu
2014 ◽  
Vol 878 ◽  
pp. 600-608 ◽  
Author(s):  
Chao Deng ◽  
Ying Li ◽  
Jin Hui Li ◽  
Hua Fen Li

Polybrominated diphenyl ethers (PBDEs), especially pentaBDE and decaBDE have been extensively used as flame retardants in plastics of most electronic equipment. However, PBDE congeners have been found in the environment, in wildlife and in human body worldwide with evidences that they pose risks both to human health and to the entire ecosystem. China has become an important pentaBDE and decaBDE production country because of the increasing domestic demand due to rapid development of electronic industry in recent years. Although pentaBDE was phased out in 2004, decaBDE still remains in production and is used in electrical industry. Additionally, large amounts of plastics containing these pollutants from waste electrical and electronic equipment (WEEE) are generated in China each year and their disposal has been a vital environmental challenge. Machaniclal recycling, fedlock recycling and landfilling are three main means of disposal of WEEE plastics. This article reviews the production of PBDEs, the amounts of WEEE and the disposal of WEEE plastics worldwide, with a special focus on China. The state of the emission of PBDEs and highly toxic polybrominated dibenzo dioxins/furans in the process of disposal is summed up based on previous studies. This article recommends that mechanical recycling should be the main means of disposal of WEEE recycling with regards to the summaries, the current practices and the status in China.


2019 ◽  
Vol 25 (2) ◽  
pp. 83-98
Author(s):  
A. P. Sereda ◽  
A. M. Belyakova

The objective of the study — to propose a classification for Haglund’s syndrome based on the differentiated treatment outcomes and to conduct a systematic review of articles on this topic.Materials and Methods. The article based on the diagnosis and treatment of 77 patients with Haglund’s syndrome. 68 patients with Haglund’s syndrome underwent surgery (79 operations), 14 of which were endoscopic. In 9 patients conservative treatment techniques were undertaken.Results. As a result of analyzing a variety of cases of Haglund’s syndrome, we proposed clinical and morphological classifications for Haglund’s syndrome that help to choose the optimal treatment tactics. according to its clinical form, Haglund’s deformity may be common, atypical, and “hiding”. A special clinical variation is a cosmetic form. Depending on morphological characteristics, it was proposed to distinguish upper, upper-lateral, “arc type”, total types, and atypical variations. With the upper type of deformity and, rarely, with the upper-lateral one, an endoscopic technique or minimally invasive surgical correction is preferable. For more extensive variants, the only solution should be an open procedure. The outcomes at 11.5±1.2 months after surgery showed significant improvement in patient condition as compared to the preoperative status (p<0.001). On the AOFAS, the scores were 92.2±3.1 after open procedures (86.1±3.5 and 93.2±2.2 for the different types) and 94.7±1.8 after endoscopic operations. However, we cannot speak confidently of the advantage of endoscopic surgery, since adequate resection during the endoscopic operation is possible only in limited cases of the Haglund’s deformity types (upper and upper-lateral). For the same reason, it is impossible to compare the results of minimally invasive surgery with fluoroscopic control with the results of open surgical intervention. according to AOFAS (p<0.001), conservative treatment also improved the status of patients, more specifically from 75.1±4.7 to 80.1±5.7. However these improvements were significantly less compared to surgical treatment (p<0.001). Our results of patient treatment were included in an updated systematic review of twenty-eight studies related to the results of open (681 patients in total) and endoscopic (321 patients in total) treatment of patients with Haglund’s syndrome.Conclusion. Particular attention should be paid to the “hiding” clinical cases which do not manifest signs of tenopathy, but are detrimental to athletic performance. We consider treatment strategy based on clinical and morphological classifications as justified, when the type of operation (open, minimally invasive or endoscopic) was determined by the type of deformity and its localization.


elni Review ◽  
2006 ◽  
pp. 27-36
Author(s):  
Deepali Sinha-Khetriwal ◽  
Rolf Widmer ◽  
Mathias Schluep ◽  
Martin Eugster ◽  
Xuejun Wang ◽  
...  

Electrical and electronic equipment pervades modern lifestyles and its usage is growing rapidly around the world. Quick obsolescence and newer functionalities are resulting in huge quantities of these products become waste. This fast growing waste stream has been subject to regulations based on the concept of extended producer responsibility in several countries, mainly in Europe. This paper looks at the progress of legislating this particular waste stream with special emphasis on the three countries, namely China, India and South Africa, within the framework of the Swiss global e-waste programme, after looking briefly at the status of transposing the WEEE Directive (waste electrical and electronic equipment) in Europe.


Author(s):  
Samuel - Davy- Baleng ◽  
Olive -Vivien –Noah/Ewoti ◽  
Ernest Koji ◽  
Antoine Tamsa /Arfao ◽  
Luciane - Marlyse – Moungang ◽  
...  

A study was carried out in order to assess the health impact linked to the untreated use of water from the watercourse in the town of Nkolamfamba by the neighboring populations. The surveys were conducted on the entire population taking into account the status of the respondent, his responsibility in the family, his level of education. In a questionnaire, after identifying the respondents, the points considered were knowledge of the management of solid and liquid household waste, the supply of drinking water, the health and environmental impact linked to the use of untreated water. The results of the surveys were codified and processed by statistical analyzes using SPSS version 16 software. 0 in order to establish the links between the health risks recorded and the microbiological quality of the water used. It shows positive and very significant correlations (P <0.01) between the type of activity carried out and the treatment of water before consumption, between the source of supply and the treatment with bleach, between monthly income and water supply, between the interviewee's neighborhood and the water treatment before consumption. Positive and significant correlations (P <0.05) were observed between the source of water supply and water-borne diseases, the source of water supply and knowledge of water quality, water-borne diseases and water treatment before consumption. However, a significant but negative correlation was observed between monthly income and bleach treatment. The populations of the locality of Nkolafamba should be sensitized on water treatment techniques.


Author(s):  
L.J. Chen ◽  
Y.F. Hsieh

One measure of the maturity of a device technology is the ease and reliability of applying contact metallurgy. Compared to metal contact of silicon, the status of GaAs metallization is still at its primitive stage. With the advent of GaAs MESFET and integrated circuits, very stringent requirements were placed on their metal contacts. During the past few years, extensive researches have been conducted in the area of Au-Ge-Ni in order to lower contact resistances and improve uniformity. In this paper, we report the results of TEM study of interfacial reactions between Ni and GaAs as part of the attempt to understand the role of nickel in Au-Ge-Ni contact of GaAs.N-type, Si-doped, (001) oriented GaAs wafers, 15 mil in thickness, were grown by gradient-freeze method. Nickel thin films, 300Å in thickness, were e-gun deposited on GaAs wafers. The samples were then annealed in dry N2 in a 3-zone diffusion furnace at temperatures 200°C - 600°C for 5-180 minutes. Thin foils for TEM examinations were prepared by chemical polishing from the GaA.s side. TEM investigations were performed with JE0L- 100B and JE0L-200CX electron microscopes.


Author(s):  
Frank J. Longo

Measurement of the egg's electrical activity, the fertilization potential or the activation current (in voltage clamped eggs), provides a means of detecting the earliest perceivable response of the egg to the fertilizing sperm. By using the electrical physiological record as a “real time” indicator of the instant of electrical continuity between the gametes, eggs can be inseminated with sperm at lower, more physiological densities, thereby assuring that only one sperm interacts with the egg. Integrating techniques of intracellular electrophysiological recording, video-imaging, and electron microscopy, we are able to identify the fertilizing sperm precisely and correlate the status of gamete organelles with the first indication (fertilization potential/activation current) of the egg's response to the attached sperm. Hence, this integrated system provides improved temporal and spatial resolution of morphological changes at the site of gamete interaction, under a variety of experimental conditions. Using these integrated techniques, we have investigated when sperm-egg plasma membrane fusion occurs in sea urchins with respect to the onset of the egg's change in electrical activity.


2000 ◽  
Vol 64 (11) ◽  
pp. 772-774 ◽  
Author(s):  
JG Odom ◽  
PL Beemsterboer ◽  
TD Pate ◽  
NK Haden

2002 ◽  
Vol 110 (2) ◽  
pp. 9-15 ◽  
Author(s):  
W Freedman
Keyword(s):  

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