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RISS 인기검색어
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- 저자 : Youhong Tang (검색결과 3 건)
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Experimental understanding of the viscosity reduction ability of TLCPs with different PEs
Tang, Youhong,Zuo, Min,Gao, Ping 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.3
In this study, two thermotropic liquid crystalline polyesters (TLCPs) synthesized by polycondensation of p-hydroxybenzoic acid /hydroquinone/ poly dicarboxylic acid were used as viscosity reduction agents for polyethylene (PE). The TLCPs had different thermal, rheological and other physical properties that were quantitatively characterized. The two TLCPs were blended with high density PE (HDPE) and high molecular mass PE (HMMPE) by simple twin screw extrusion under the same weight ratio of 1.0 wt% and were each rheologically characterized at $190^{\circ}C$. The TLCPs acted as processing modifiers for the PEs and the bulk viscosity of the blends decreased dramatically. However, the viscosity reduction ability was not identical: one TLCP had obviously higher viscosity reduction ability on the HDPE, with a maximum viscosity reduction ratio of 68.1%, whereas the other TLCP had higher viscosity reduction ability on the HMMPE, with a maximum viscosity reduction ratio of 98.7%. Proposed explanations for these differences are evaluated.
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Experimental understanding of the viscosity reduction ability of TLCPs with different PEs
Youhong Tang,Min Zuo,Ping Gao 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.3
In this study, two thermotropic liquid crystalline polyesters (TLCPs) synthesized by polycondensation of phydroxybenzoicacid /hydroquinone/ poly dicarboxylic acid were used as viscosity reduction agents forpolyethylene (PE). The TLCPs had different thermal, rheological and other physical properties that werequantitatively characterized. The two TLCPs were blended with high density PE (HDPE) and high molecularmass PE (HMMPE) by simple twin screw extrusion under the same weight ratio of 1.0 wt% and wereeach rheologically characterized at 190oC. The TLCPs acted as processing modifiers for the PEs and thebulk viscosity of the blends decreased dramatically. However, the viscosity reduction ability was not identical:one TLCP had obviously higher viscosity reduction ability on the HDPE, with a maximum viscosityreduction ratio of 68.1%, whereas the other TLCP had higher viscosity reduction ability on the HMMPE,with a maximum viscosity reduction ratio of 98.7%. Proposed explanations for these differences are evaluated.
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Youhong Lin,Shuyu Li,Bingfeng Fu,Ping Tang 한국국회학회 2019 한국과 세계 Vol.1 No.2
최근 몇 년간 국제 테러단체가 점점 확대고 있으며, 파키스탄은 새로운 테러단체인 “Arch of Instability” 의 중심이 되고 있다. 이는 파키스탄의 국내 정치 경제 발전에 심각한 위협을 줄 뿐만 아니라 국제 안보 구조와 대테러 국제정세에 심각한 위협을 가하고 있다. 또한 이는 중국 “일대일로”의 중요한 프로젝트인 “파키스탄 경제 통로”에도 심각한 위협이 되고 있다. 따라서 기존문헌을 정리한 결과를 파키스탄의 테러 상황에 대한 추가적인 연구가 필요하여 본 논문은 컴퓨터 과학 및 기술영역에서 새로 부각되고 있는 시각화 연구방법을 사용하여 Web of Science 데이터베이스를 활용하고 국제 학술계가 파키스탄의 테러에 대한 연구결과를 시각화 분석하여 국제학술계가 연구한 파키스탄 테러단체의 국가간의 협력망도 제출하였다. 더불어 파키스탄 테러 연구에 관한 국제 학술계의 저자 및 협력 네트워크에 대한 양적인 분석으로 파키스탄 테러 연구소의 국제 학술계의 연구 핫스팟 및 연구 트렌드도 정리하였다. In recent years, as the international terrorism is increasingly spread around, Pakistan has become one of the center of the Arch of Instability of the Indian subcontinent, which not only seriously threatens the political economy in Pakistan but also challenges the international safety pattern and anti-terrorist security situation severely. At the same time, this will also be a serious threat to the China-Pakistan Economic Corridor(CPEC), a flagship project of China s Belt and the Road Initiative(BRI). Therefore, it is necessary to study the current situation of Pakistan terrorism. The authors use the visualization research method to have visualization analysis of the results from international academe about the Pakistan terrorism research in database of Web of Science and depicts the international cooperation network of Pakistan terrorism studied by the international academe. The quantitative analysis of the international academe about the author and cooperation network of Pakistan terrorism research can help to further figure out the research hotspots and research fronts of the Pakistan terrorism research from the international academe.
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