检索结果-南通市图书馆

A review of C_1 chemistry synthesis using yttrium-stabilized zirconia catalyst

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2008年第1期26卷 1-6页

作者： Antonius Indarto Jae-Wook Choi Hwaung lee hyung Keun Song Plasma-Catalyst Chemical Process

C1 chemistry based on synthesis gas, methane, and carbon dioxide offers many routes to industrial chemicals. The reactions related to the synthesis of gas can be classified into direct and indirect approach for making such products, such as acetic acid, dimethyl ether, and alcohol. Catalytic syngas processing is currently done at high temperatures and pressures, conditions that could be unfavorable for the life of the catalyst. Another issue of C1 chemistry is related to the methane-initiated process. It has been known that direct methane conversions are still suffering from low yields and selectivity of products resulting in unprofitable ways to produce products, such as higher hydrocarbons, methanol, and so on. However, many experts and researchers are still trying to find the best method to overcome these barriers, for example, by finding the best catalyst to reduce the high-energy barrier of the reactions and conduct only selective catalyst-surface reactions. The appli- cation of Yttria-Stabilized Zirconia （YSZ） and its combination with other metals for catalyzing purposes are increasing. The existence of an interesting site that acts as oxygen store could be the main reason for it. Moreover, formation of intermediate species on the surface of YSZ also contributes significantly in increasing the production of some specific products. Understanding the phenomena happening inside could be necessary. In this article, the use of YSZ for some C1 chemistry reactions was discussed and reviewed.

关键词： C1 chemistry methane synthesis gas methanol yttria-stabilized zirconia catalyst oxygen storage rare earths

Development of single-action,two-step clinching system using finite element analysis

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2009年第B9期19卷 266-270页

作者： Seong-Wook lee Tae-hyung KIM Geun-Jo HAN Power & Industrial Systems R&D Center Hyosung Corporation Department of Mechanical Engineering Department of Mechanical Engineering Dong-A University

Traditional manufacturing processes for bending and combining the upper and lower heat insulation plates for a car catalytic converter need two kinds of bending dies. This study was carried out to develop a single-action, two-step clinching system for clinching heat insulation plates. To design the operating mechanism for this clinching system, finite element analysis was used to estimate the bending load needed and to predict the bent shape of the heat insulation plate. Then a recovery and cushioning system was designed for the bending die. It is expected that this new process will improve the manufacturing quality of heat insulation plates and will reduce manufacturing cost. And a higher value-added technique for mold and pressing systems was introduced.

关键词：缓冲系统有限元分析开发汽车催化转化器单动模具技术隔热板板弯曲

Stability analysis for time delay control of nonlinear systems in discrete-time domain with a standard discretisation method

在线全文

学校读者我要写书评

暂无评论

Control Theory and Technology 2020年第1期18卷 92-106页

作者： Jinoh lee Gustavo A.MEDRANO-CERDA Je hyung JUNG Advanced Robotics Istituto Italian.di TecnologiaVia Morego 30Genoa16163Italy Tecnalia Research and Innovation Mikeletegi Pasealekua1-3E-20009Donostia-San SebastianSpain

This paper provides stability analysis results for discretised time delay control(TDC)as implemented in a sampled data system with the standard form of zero-order *** first substantiate stability issues in discrete-time TDC using an example and propose sufficient stability criteria in the sense of *** parameters significantly affecting the overall system stability are the sampling period,the desired trajectory and the selection of the reference model dynamics.

关键词： Time delay control(TDC) discretisation stability analysis zero-order hold

Decomposition of CCl_4 and CHCl_3 on gliding arc plasma

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2006年第1期18卷 83-89页

作者： Antonius Indarto CHOI Jae-wook lee Hwaung SONG hyung-keun Korea Institute of Science and Technology Clean Technology Research Center P.O. Box 131 Cheongryang Seoul 130-650 Korea Korea Institute of Science and Technology Clean Technology Research Center P.O. Box 131 Cheongryang Seoul 130-650 Korea.

Decomposition of chlorinated hydrocarbons, CCl4 and CHCl3, in gliding plasma was examined. The effects of initial concentrations, total gas flow rates, and power consumption have been investigated. The conversion result was relatively high. It reached 80% for CCl4 and 97% for CHCl3. Using atmospheric air as the carrier gas, the plasma reaction occurred at exothermic reaction and the main products were CO2, CO, and Cl2. Transformation into CCl4 was also detected for CHCl3 decomposition reaction. The conversion of CCh and CHCl3 were increased with the increasing applied frequency and decreasing total gas flow rate.

关键词： plasma gliding arc CCl4 CHCl3 decomposition reaction

THE PHYSICAL PROPERTIES OF POLY(2-HYDROXYETHYL METHACRYLATE)COPOLYMER HYDROGELS USED AS INTRAVAGINAL RINGS

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2009年第3期27卷 359-366页

作者： Young A Han Eun Mi lee Byung chul Ji Department of Textile System Engineering Kyungpook National UniversityDaegu 702-701Korea Department of Advanced Organic Materials Science and Engineering Kyungpook National UniversityDaegu 702-701Korea

Poly(2-hydroxyethyl methacrylate)(PHEMA)and poly(2-hydroxyethyl methacrylate-co-sodium methacrylate) [P(HEMA-co-SMA)]hydrogels with different compositions were prepared to be used as intravaginal rings,and their gelation time,water content,mechanical properties and morphology were *** water content of PHEMA and P(HEMA-co-SMA) hydrogels decreased as the concentration of the monomer and the degree of crosslinking increased,while the water content significantly increased as the content of SMA,the hydrophilic monomer,*** increasing of the concentration of the crosslinking agent affected the tensile and flexural properties *** presence of a proper small amount of SMA also led the tensile and flexural modulus to move to a higher *** results showed that P(HEMA-co-SMA) hydrogel with high drug load and good mechanical properties at optimum preparation conditions can be prepared for intravaginal rings to deliver nonhormonal *** results may be applied to prepare better intravaginal drug delivery devices.

关键词： PHEMA and P(HEMA-co-SMA)hydrogels Tensile and flexural properties High drug load Intravaginal drug delivery devices.

Prediction of Cold and Heat Patterns Using Anthropometric Measures Based on Machine Learning

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2018年第1期24卷 16-23页

作者： Bum Ju lee Jae chul lee Jiho Nam Jong Yeol Kim Medical Research Division Korea Institute of Oriental Medicine

Objective： To examine the association of body shape with cold and heat patterns, to determine which anthropometric measure is the best indicator for discriminating between the two patterns, and to investigate whether using a combination of measures can improve the predictive power to diagnose these patterns. Methods： Based on a total of 4,859 subjects （3,000 women and 1,859 men）, statistical analyses using binary logistic regression were performed to assess the significance of the difference and the predictive power of each anthropometric measure, and binary logistic regression and Naive Bayes with the variable selection technique were used to assess the improvement in the predictive power of the patterns using the combined measures. Results： In women, the strongest indicators for determining the cold and heat patterns among anthropometric measures were body mass index （BMI） and rib circumference; in men, the best indicator was BMI. In experiments using a combination of measures, the values of the area under the receiver operating characteristic curve in women were 0.776 by Naive Bayes and 0.772 by logistic regression, and the values in men were 0.788 by Naive Bayes and 0.779 by logistic regression. Conclusions： Individuals with a higher BMI have a tendency toward a heat pattern in both women and men. The use of a combination of anthropometric measures can slightly improve the diagnostic accuracy. Our findings can provide fundamental information for the diagnosis of cold and heat patterns based on body shape for personalized medicine.

关键词： cold and heat patterns personalized medicine cold syndrome predictive power machine learning data mining

Milk protein-shelled gold nanoparticles with gastrointestinally active absorption for aurotherapy to brain tumor

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2022年第2期7卷 35-48页

作者： hyung Shik Kim Seung Jae lee Dong Yun lee Department of Bioengineering College of Engineeringand BK FOUR Biopharmaceutical Innovation Leader for Education and Research GroupHanyang UniversitySeoul04763Republic of Korea Institute of Nano Science and Technology Hanyang UniversitySeoul04763Republic of Korea

Orally absorbable gold nanoparticles(AuNP)having cancer ablation therapy is strongly demanded to treat glioblastoma multiforme(GBM)for patients with its highest incidence ***,we develop a milk protein lactoferrin-conjugated AuNP for its oral absorption and targeting to the GBM through the interaction between lactoferrin(Lf)and lactoferrin receptor(LfR)that is highly expressed in the intestine,blood-brain barrier and *** stability and long circulation of AuNP,glutathione and polyethylene glycol(PEG)is introduced,which is called to *** Lf-PEG-AuNP are orally administered to orthotopic GBM-bearing mice,11-fold and 8-fold higher concentrations of AuNP are measured in bloodstreams and GBM in the brain,respectively,compared with ***,orally administered Lf-PEG-AuNP exhibit an outstanding temperature rise in GBM by irradiating laser and significantly reduce tumor ***,we suggest that the Lf-PEG-AuNP can fundamentally target GBM in the brain through oral absorption,and that its efficient photothermal therapy is possible.

关键词： intestine absorption gastrointestinal

Radar Data Assimilation for the Simulation of Mesoscale Convective Systems

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2010年第5期27卷 1025-1042页

作者： Jo-Han lee Hyun-Ha lee Yonghan CHOI hyung-Woo KIM Dong-Kyou lee School of Earth and Environmental Sciences Seoul National University

A heavy rainfall case related to Mesoscale Convective Systems （MCSs） over the Korean Peninsula was selected to investigate the impact of radar data assimilation on a heavy rainfall forecast. The Weather Research and Forecasting （WRF） three-dimensional variational （3DVAR） data assimilation system with tuning of the length scale of the background error covariance and observation error parameters was used to assimilate radar radial velocity and reffectivity data. The radar data used in the assimilation experiments were preprocessed using quality-control procedures and interpolated/thinned into Cartesian coordinates by the SPRINT/CEDRIC packages. Sensitivity experiments were carried out in order to determine the optimal values of the assimilation window length and the update frequency used for the rapid update cycle and incremental analysis update experiments. The assimilation of radar data has a positive influence on the heavy rainfall forecast. Quantitative features of the heavy rainfall case, such as the maximum rainfall amount and Root Mean Squared Differences （RMSDs） of zonal/meridional wind components, were improved by tuning of the length scale and observation error parameters. Qualitative features of the case, such as the maximum rainfall position and time series of hourly rainfall, were enhanced by an incremental analysis update technique. The positive effects of the radar data assimilation and the tuning of the length scale and observation error parameters were clearly shown by the 3DVAR increment.

关键词： WRF 3DVAR 3DVAR cycling initialization tuning heavy rainfall radar data

Ecotoxicity evaluation of Cu-and Fe-CNT complexes based on the activity of bacterial bioluminescence and seed germination

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2018年第5期30卷 198-205页

作者： In chul Kong Kyung Seok Ko Mun Hui lee Ji Hwoan lee Young-Hwan Han Department of Environmental Engineering Yeungnam UniversityGyungsan 38541Republic of Korea Geologic Environment Division Korea Institute of Geoscience and Mineral Resources(KIGAM)Daejeon 34132Republic of Korea School of Materials Science and Engineering Yeungnam University Gyungsan 38541Republic of Korea International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430079China

The toxic effects of the composites of Fe^0 and Cu^0 with different percentages of CNTs were examined based on the activity of bacterial bioluminescence and seed germination. In terms of the EC50 values, the toxic effects of Cu^0 on bacterial bioluminescence and seed germination were approximately 2 and 180 times greater than that of Fe^0, respectively. The toxicity increased with increasing CNT content in the Cu-CNT mixtures for both organisms,whereas opposite results were observed with Fe-CNT mixtures. The mean toxic effects of Cu-CNT（6%） were approximately 1.3–1.4 times greater than that of Cu-CNT（0%）, whereas the toxic effects of Fe-CNT（6%） were approximately 2.1–2.5 times lower than that of Fe-CNT（0%） for both the bioluminescence activity and seed germination. The causes of this phenomenon are unclear at this point. More research will be needed to elucidate the mechanism of the toxicity of nano-mixture materials and the causes of the different patterns of toxicity with Cu-and Fe-CNT mixtures.

关键词： Metal-CNT complex Bioluminescence Seed germination Toxic effect