http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Recent progress on the traditional and emerging catalysts for propane dehydrogenation
Fushan Feng,Haiyuan Zhang,Shaoqi Chu,Qinqin Zhang,Chao Wang,Guang-Jian Wang,Fang Wang,Liancheng Bing,Dezhi Han 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
Propene is an important chemical raw material with continuously growing demand from the propenedownstream industry. Compared with the traditional catalytic cracking process and steam cracking ofnaphtha, the propane dehydrogenation (PDH) process is an attractive alternative to efficiently producehigh-purity propene. Presently, the traditional Pt-based and Cr-based catalysts for PDH are mainly usedin commercial processes. And the non-noble metal catalysts and carbon catalysts for PDH also receiveincreasing attention with the development of research both from academia and industry. In this review,the recent progress on the traditional catalysts, the emerging non-noble metal catalysts, and carbon catalystswas summarized, together with the discussion of the key research issues and development directionof these PDH catalysts. This review could provide the theoretical and technical foundation fordeveloping novel high-efficiency PDH catalysts.
Investigation of Carrier Transport Mechanism in CdSe/PVK Hybrid Nanocomposites
Fushan Li,Han-Moe Cha,Seung-Mi Seo,손동익,Hyuk-Ju Kim,김태환 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1
The carrier transport mechanism in inorganic/organic hybrid nanocomposites consisting of core/shell type CdSe/ZnS nanoparticles dispersed in a poly(N-vinylcarbazole) (PVK) layer was investigated by using current density-electric field (J-E) measurements. The J-E curves showed that the current density increased with increasing content of CdSe nanoparticles up to 0.2 wt% and that the current density decreased above a 0.5 wt% content of nanoparticles due to the aggregation of the PVK layer. A proposed theoretical model for the carrier transport mechanism is in reasonable agreement with the J-E results.
Gene expression defines natural changes in mammalian lifespan
Fushan, Alexey A,Turanov, Anton A,Lee, Sang-Goo,Kim, Eun Bae,Lobanov, Alexei V,Yim, Sun Hee,Buffenstein, Rochelle,Lee, Sang-Rae,Chang, Kyu-Tae,Rhee, Hwanseok,Kim, Jong-So,Yang, Kap-Seok,Gladyshev, Vad BLACKWELL PUBLISHING 2015 AGING CELL Vol.14 No.3
<P>Mammals differ more than 100-fold in maximum lifespan, which can be altered in either direction during evolution, but the molecular basis for natural changes in longevity is not understood. Divergent evolution of mammals also led to extensive changes in gene expression within and between lineages. To understand the relationship between lifespan and variation in gene expression, we carried out RNA-seq-based gene expression analyses of liver, kidney, and brain of 33 diverse species of mammals. Our analysis uncovered parallel evolution of gene expression and lifespan, as well as the associated life-history traits, and identified the processes and pathways involved. These findings provide direct insights into how nature reversibly adjusts lifespan and other traits during adaptive radiation of lineages.</P>
Simulation Study of an e-Beam Addressed Liquid Crystal Display for Projection
Zhou, Fushan,Yang, Deng-Ke,Molitor, R.J. The Korean Infomation Display Society 2002 Journal of information display Vol.3 No.4
We have carried out a simulation study on an e-beam addressed liquid crystal projection display in which the liquid crystal is switched by the electric field of the charge, produced by an electron beam, on the surface of the display. We calculated the electric field produced by the surface charge, the liquid crystal director configuration and the profile of the transmitted light. We studied the factors affecting the resolution of the display and the effect of pretilt angle on the performance of the display. The e-beam addressed liquid crystal projection display potentially has the advantages of high resolution and high brightness.
Li, Fushan,Son, Dong Ick,Cho, Sung Hwan,Kim, Tae Whan IOP Pub 2009 Nanotechnology Vol.20 No.18
<P>Transmission electron microscopy images showed that the ZnO quantum dots (QDs) were conjugated with multi-walled carbon nanotubes (MWCNTs). Bistable memories utilizing an ensemble of the ZnO QD–MWCNT heterostructures were developed and the storage capability of the devices was significantly enhanced due to the conjugation of the ZnO QDs and the MWCNTs. Operating mechanisms of memory devices fabricated utilizing the ZnO QD–MWCNT heterostructures are described on the basis of the current–voltage results. The memory devices exhibited excellent environmental stability at ambient conditions. </P>
Li, Fushan,Cho, Sung Whan,Park, Kyu Ha,Son, Dong Ick,Kim, Tae Whan American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.7
<P>Transmission electron microscopy images showed that ZnO nanoparticles were randomly distributed inside the polymethyl methacrylate (PMMA) layer. Capacitance-voltage (C-V) measurements on the Al/ZnO nanoparticles embedded in a PMMA layer/C60/p-Si diode at 300 K showed a clockwise hysteresis with a flatband voltage shift due to existence of the ZnO nanoparticles and a C60 buffer layer. The insertion of the C60 layer enlarged the memory window of the device containing the ZnO nanoparticle, as estimated by the flatband voltage shift in the C-V hysteresis. Capacitance-time measurements showed that the devices exhibited excellent memory retention ability at ambient conditions. Operating mechanisms of the charge injection, capture, and emission in the active layer and the charging and the discharging processes in the devices are described on the basis of the C-V results.</P>
Flexible photovoltaic cells fabricated utilizing ZnO quantum dot/carbon nanotube heterojunctions
Li, Fushan,Son, Dong Ick,Cho, Sung Hwan,Kim, Won Tae,Kim, Tae Whan IOP Pub 2009 Nanotechnology Vol.20 No.15
<P><I>In situ</I> growth of ZnO quantum dots (QDs) on the surface of multi-walled carbon nanotubes (MWCNTs) was presented, and their application in photovoltaic cells by using flexible polyethylene terephthalate substrates was demonstrated. High-resolution transmission electron microscopy images revealed the conjugation of ZnO QDs with MWCNTs. Photoluminescence spectra indicated that the charge transfer efficiency at ZnO QD–MWCNT heterojunctions was above 90%, as confirmed by time-resolved photoluminescence measurements. Current–voltage measurements on the flexible devices fabricated utilizing ZnO QD–MWCNT heterojunctions showed the robust nature of the ZnO QD–MWCNT-based photovoltaic cells and their potential applications as the power source for flexible hand-held consumer electronics. </P>