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Separation of Valuable Metal from Waste Photovoltaic Ribbon through Extraction and Precipitation
Chen, Wei-Sheng,Chen, Yen-Jung,Yueh, Kai-Chieh The Korean Institute of Resources Recycling 2020 資源 리싸이클링 Vol.29 No.2
With rapid increasing production and installation, recycling of photovoltaic modules has become the main issue. According to the research, the accumulation of waste modules will reach to 8600 tons in 2030. Moreover, Crystalline-silicon (c-Si) Photovoltaic modules account for more than 90% of the waste. C-Si PV modules contain 1.3% of weight of photovoltaic ribbon inside which contains the most of lead, tin and copper in the PV modules, which would cause environmental and humility problem. This study provided a valuable metal separation process for PV ribbons. Ribbons content 82.1% of Cu, 8.9% of Sn, 5.2% of Pb, and 3.1% of Ag. All of them were leached by 3M of hydrochloric acid in the optimal condition. Ag was halogenated to AgCl and precipitated. Cu ion was extracted and separated from Pb and Sn by Lix984N then stripped by 3M H2SO4. The effect of the optimal parameters of extraction was also studied in this essay. The maximum extraction efficiency of Cu ion was 99.64%. The separation condition of Pb and Sn were obtained by adjusting the pH value to 4 thought ammonia to precipitate and separate Pb and Sn. The recovery of Pb and Sn can reach 99%.
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Fabrication of a Biodegradable Multi-layered Polyvinyl Alcohol Stent
Mei-Chen Lin,Ching-Wen Lou,Jan-Yi Lin,Ting An Lin,Yueh-Sheng Chen,Jia-Horng Lin 한국섬유공학회 2018 Fibers and polymers Vol.19 No.8
This study aims to develop biodegradable vascular stents that prevent permanent damage caused by rejection of the immune system of the human body. Polyvinyl alcohol (PVA) yarns are twisted to enhance their strength. The twisted yarns are braided and then coated with chitosan (CS). The CS-coated PVA vascular stents are chemically crosslinked with genipin (GP) to improve their flexibility and biodegradability. Their morphological characteristics are also observed using a stereoscopic microscope, and their properties are evaluated through scanning electron microscopy, Fourier transform infrared, bending test, biodegradability test, drug release measurement, and MTT assay. Results reveal that wet PVA-CS-GP vascular stents coated with multiple CS layers can maintain a tubular structure when they are bent. After crosslinking is performed, the compressive strength of the PVA-CS-GP stents is 17.04 times higher than that of pure PVA. The weight loss rate of the PVA-CS-GP vascular stents as <3 % after 30 days. The PVA-CS-GP vascular stents composed of 0.10 % heparin sodium show a good drug release effect. Biological activity test indicates that these stents exhibit good proliferation, and our structural model verifies that they are good vascular stents.
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Bamboo Charcoal/Quick-Dry/Metallic Elastic Knits: Manufacturing Techniques and Property Evaluations
Jia-Horng Lin,Chih Hung He,Mong-Chuan Lee,Yueh-Sheng Chen,Ching-Wen Lou 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7
Protective clothing with electromagnetic shielding effectiveness (EMSE) is a functional textile, which shieldselectromagnetic waves to protect the human body from the far infrared rays. Traditional EMSE garments primarily usemetallic plates for reflecting electromagnetic interference (EMI). However, they also have disadvantages of a heavy weight,easy corrosion, and high production cost. In this study, three different functional yarns are combined, during which the twistnumber of metallic wires is changed for a better shielding effect. A crochet machine is used to fabricate functional elasticknits with the metallic composite yarns as the warp- and weft-inlaid yarns. The test results show that double (D) functionalelastic knits exhibit EMSE of above 20 dB when the EMI are between 1.0 and 3.0 GHz. In addition, the knit structure canimprove breaking tensile strength by 170 % and increases bursting strength by 58 %, but undermines the tear strength by10 %. Although changing twist number of metallic composite yarns does not affect water absorption rate along the weftdirection, it helps increasing elastic recovery rate by 3.1 %, water absorption rate along the warp direction by 106 %, farinfraredemissivity by 2.3 %, water vapor transmission rate by 20 %, and air permeability by 6 %.
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Chuan-Te Tsai,Yung-Ming Chang,Shu-Luan Lin,Yueh-Sheng Chen,Yu-Lan Yeh,Viswanadha Vijaya Padma,Chin-Chuan Tsai,Ray-Jade Chen,Tsung-Jung Ho,Chih-Yang Huang 한국식품영양과학회 2016 Journal of medicinal food Vol.19 No.3
Angiotensin II (Ang II) is a very important cardiovascular disease inducer and may cause cardiac pathological hypertrophy and remodeling. We evaluated a Chinese traditional medicine, alpinate oxyphyllae fructus (AOF), for therapeutic efficacy for treating Ang II-induced cardiac hypertrophy. AOF has been used to treat patients with various symptoms accompanying hypertension and cerebrovascular disorders in Korea. We investigated its protective effect against Ang II-induced cytoskeletal change and hypertrophy in H9c2 cells. The results showed that treating cells with Ang II resulted in pathological hypertrophy, such as increased expression of transcription factors NFAT-3/p-NFAT-3, hypertrophic response genes (atrial natriuretic peptide [ANP] and b-type natriuretic peptide [BNP]), and Gαq down-stream effectors (PLCβ3 and calcineurin). Pretreatment with AOF (60–100 μg/mL) led to significantly reduced hypertrophy. We also found that AOF pretreatment significantly suppressed the cardiac remodeling proteins, metalloproteinase (MMP9 and MMP2), and plasminogen activator, induced by Ang II challenge. In conclusion, we provide evidence that AOF protects against Ang II-induced pathological hypertrophy by specifically inhibiting the insulin-like growth factor (IGF) II/IIR-related signaling pathway in H9c2 cells. AOF might be a candidate for cardiac hypertrophy and ventricular remodeling prevention in chronic cardiovascular diseases.
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