检索结果-南通市图书馆

A semi-analytical method for forced vibration analysis of cracked laminated composite beam with general boundary condition

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 Ocean Engineering and Science 2021年第1期6卷 40-53页

作者： Sok Kim Kwanghun Kim Myongchol Ri Yongsong paek Choljun Kim Department of Information Engineering Chongjin Mine&Metal UniversityChongjin 999091Democratic People’s Republic of Korea Department of Engineering Machine Pyongyang University of Mechanical EngineeringPyongyang 999093Democratic People’s Republic of Korea Institute of Science Pyongyang University of Mechanical EngineeringPyongyang 999093Democratic People’s Republic of Korea Department of Resources Development Mechanical Engineering Pyongyang University of Mechanical EngineeringPyongyang 999093Democratic People’s Republic of Korea

In this paper,a semi-analytical method for the forced vibration analysis of cracked laminated composite beam(CLCB)is *** computational model is formulated by Timoshenko beam theory and its dynamic solution is solved using the Jacobi-Ritz *** boundary conditions(BCs)at both ends of the CLCB are generalized by the application of artificial elastic springs,the CLCB is separated into two elements along the crack,the flexibility coefficient of fracture theory is used to model the essential continuous condition of the connective *** the allowable displacement functions used to analyze dynamic characteristics of CLCB are expressed by classical Jacobi orthogonal polynomials in a more general *** accuracy of the proposed method is verified through the compare with results of the finite element method(software ABAQUS is used in this paper).On this basis,the parametric study for dynamic analysis characteristics of CLCB is performed to provide reference datum for engineers.

关键词： Semi-analytical method Cracked laminated composite beam(CLCB) Dynamic analysis General boundary condition Numerical analysis

Design Strategy for Vulcanization Accelerator of Diphenylguanidine/Cyclodextrin Inclusion Complex for Natural Rubber Latex Foam with Enhancing Performance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research 2023年第1期2022卷 97-109页

作者： Wang Zhang Liwei Lin Junqiang Guo Ming Wu Sumin Park Hang Yao Sun Ha paek Guowang Diao Yuanzhe Piao Department of Applied Bioengineering Graduate School of Convergence Science and Technology Seoul National UniversitySeoul 08826Republic of Korea School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhouJiangsu 225002China Departmentof Neurosurgery Movement Diorder CenterSeoul National University HospitalHypoxia Ischemia Disease InstituteCancer Research InstituteSeoul National University College of MedicineSeoul 03080Republic of Korea Advanced Institutes of Convergence Technology 145 Gwanggyo-roYeongtong-guSuwon-siGyeonggi-do16229Republic of Korea

Vulcanization is an essential process to obtain high-performance rubber ***(DPG)is often used as the secondary accelerator in the vulcanization process of natural rubber(NR)***,DPG would make NR latex emulsion exhibit gelation,resulting in the negative vulcanization *** addition,exposure to DPG might lead to some physiological diseases during the production process of DPG doped NR ***-β-cyclodextrin(HP-β-CD)with the hydrophobic interior and hydrophilic exterior has the advantages of good water solubility,high bioavailability,reliable stability,and low *** this study,the inclusion complex of diphenylguanidine-hydroxypropyl-β-cyclodextrin(DPG-HP-β-CD)is prepared by bali milling with a host-guest molar ratio of 1:1,which has also been applied to the foaming process of NR *** mechanical properties of DPG-HP-β-CD inclusion complex/natural rubber latex foam(DPG-HP-β-CD/NRLF)have been significantly improved,including the tensile strength,elongation at break,hardness,compression set,resilience,and antiaging ***,the usage of DPG has been reduced,leading to the reduction of toxicity and environmental hazards.

关键词： latex rubber Complex

Mutation of Oryza sativa CORONATINE INSENSITIVE 1b(OsCOI1b) delays leaf senescence

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 Integrative Plant Biology 2015年第6期57卷 562-576页

作者： Sang-Hwa Lee Yasuhito Sakuraba Taeyoung Lee Kyu-Won Kim Gynheung An Han Yong Lee Nam-Chon paek Department of Plant Science Plant Genomics and Breeding InstituteResearch Institute of Agriculture and Life SciencesSeoul National University Interdisciplinary Program in Bioinformatics Seoul National University Department of Plant Molecular Systems Biotechnology Crop Biotech InstituteKyung Hee University Department of Agricultural Biotechnology Seoul National University

Jasmonic acid （JA） functions in plant development, including senescence and immunity. Arabidopsis thaliana CORONATINE INSENSITIVE 1 encodes a JA receptor and functions in the JA‐responsive signaling pathway. The Arabidopsis genome harbors a single COI gene, but the rice （Oryza sativa） genome harbors three COI homologs, OsCOI1a, OsCOI1b, and OsCOI2. Thus, it remains unclear whether each OsCOI has distinct, additive, synergistic, or redundant func-tions in development. Here, we use the oscoi1b‐1 knockout mutants to show that OsCOI1b mainly affects leaf senescence under senescence‐promoting conditions. oscoi1b‐1 mutants stayed green during dark‐induced and natural senescence, with substantial retention of chlorophylls and photosyn-thetic capacity. Furthermore, several senescence‐associated genes were downregulated in oscoi1b‐1 mutants, including homologs of Arabidopsis thaliana ETHYLENE INSENSITIVE 3 and ORESARA 1, important regulators of leaf senescence. These results suggest that crosstalk between JA signaling and ethylene signaling affects leaf senescence. The Arabidopsis coi1‐1 plants containing 35S：OsCOI1a or 35S：OsCOI1b rescued the delayed leaf senescence during dark incubation, sug-gesting that both OsCOI1a and OsCOI1b are required for promoting leaf senescence in rice. oscoi1b‐1 mutants showed significant decreases in spikelet fertility and grain weight, leading to severe reduction of grain yield, indicating that OsCOI1‐mediated JA signaling affects spikelet fertility and grain filling.

关键词： Jasmonic acid leaf senescence OsCOI1b rice stay-green

GIGANTEA Shapes the Photoperiodic Rhythms of Thermomorphogenic Growth in Arabidopsis

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2020年第3期13卷 459-470页

作者： Young-Joon Park Jae Young Kim June-Hee Lee Byoung-Doo Lee Nam-Chon paek Chung-Mo Park Department of Chemistry Seoul National UniversitySeoul 08826Korea Department of Plant Science Seoul National UniversitySeoul 08826Korea Plant Genomics and Breeding Institute Seoul National UniversitySeoul 08826Korea These authors contributed equally to this article

Plants maintain their internal temperature under environments with fluctuating temperatures by adjusting their morphology and architecture,an adaptive process termed ***,the rhythmic patterns of plant thermomorphogenesis are governed by day-length ***,it remains elusive how thermomorphogenic rhythms are regulated by ***,we show that warm temperatures enhance the accumulation of the chaperone GIGANTEA(Gl),which thermostabilizes the DELLA protein,REPRESSOR OF ga1-3(RGA),under long days,thereby attenuating PHYTOCHROME INTERACTING FACTOR 4(PIF4)-mediated *** contrast,under short days,when Gl accumulation is reduced,RGA is readily degraded through the gibberellic acid-mediated ubiquitination-proteasome pathway,promoting thermomorphogenic *** data indicate that the GI-RGA-PIF4 signaling module enables plant thermomorphogenic responses to occur in a day-length-dependent *** propose that the Gl-mediated integration of photoperiodic and temperature information shapes thermomorphogenic rhythms,which enable plants to adapt to diel fluctuations in day length and temperature during seasonal transitions.

关键词： thermomorphogenesis day length Gl RGA PIF4

Influence of glass-based dental ceramic type and thickness with identical shade on the light transmittance and the degree of conversion of resin cement

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Oral Science 2018年第1期10卷 44-49页

作者： Soram Oh Su-Mi Shin Hyun-Jung Kim Janghyun paek Sung-Joon Kim Tai Hyun Yoon Sun-Young Kim Department of Conservative Dentistry Graduate School Kyung Hee University Seoul Korea Department of Prosthodontics School of Dentistry Kyung Hee University Seoul Korea Department of Dentistry School of Medicine Jeju National University Jeju Korea Department of Physics Korea University Seoul Korea and SDepartment of Conservative Dentistry Dental Research Institute School of Dentistry Seoul National University Seoul Korea

The purpose of this study was to assess the influence of the types and thicknesses of glass ceramic plates on light transmittance and compare the degrees of conversion(DC) of resin cement under the ceramic materials. Three ceramic plates with thicknesses of 0.5, 1.0, 2.0, and 4.0 mm were fabricated from each of five commercial ceramic blocks in shade A2: high-translucency and low-translucency IPS Empress CAD(EmpHT and EmpLT); high-translucency and low-translucency IPS *** CAD(EmxHT and EmxLT); and Vita Mark Ⅱ(Vita). The translucency parameter was obtained using a colorimeter. The light transmittance rate was measured using a photodetector attached to an optical power meter. The DC of a resin cement(Variolink N) underneath the ceramic plates was examined by Fourier transform infrared spectroscopy. The translucency parameter, light transmittance rate, and DC showed significant differences by ceramic type and thickness(P 0.05). Both type and thickness of the glass ceramics significantly influenced the light transmittance and DC of the light-cured resin cement beneath the ceramic of the same shade.

关键词： MICROTENSILE BOND STRENGTH MECHANICAL-PROPERTIES LUTING AGENT CURING MODE POLYMERIZATION TRANSMISSION TRANSLUCENCY COMPOSITE PORCELAIN HARDNESS

Arabidopsis STAY-GREEN2 Is a Negative Regulator of Chlorophyll Degradation during Leaf Senescence

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2014年第8期7卷 1288-1302页

作者： Yasuhito Sakuraba So-Yon Park Ye-Sol Kim Seung-Hyun Wang Soo-Cheul Yoo Stefan Hortensteiner Nam-Chon paek Department of Plant Science Plant Genomics and Breeding Institute Research Institute of Agriculture and Life Sciences Seoul NationalUniversity Seoul 151-921 Korea Present address: Department of Plant Pathology Physiology and Weed Science Virginia Tech Blacksburg VA 24061 USA Present address: Advanced Radiation Technology Institute Korea Atomic Energy Research Institute Jeongeup 580-185 Korea Department of Plant & Environmental Science Hankyong National University Ansung 456-749 Korea Institute of Plant Biology University of Zurich CH-8008 Zurich Switzerland

Chlorophyll （Chl） degradation causes leaf yellowing during senescence or under stress conditions. For Chl breakdown, STAY-GREEN1 （SGR1） interacts with Chl catabolic enzymes （CCEs） and light-harvesting complex II （LHCII） at the thylakoid membrane, possibly to allow metabolic channeling of potentially phototoxic Chl breakdown intermediates. Among these Chl catabolic components, SGR1 acts as a key regulator of leaf yellowing. In addition to SGR1 （At4g22920）, the Arabidopsis thaliana genome contains an additional homolog, SGR2 （At4g11910）, whose biological function remains elusive. under senescence-inducing conditions, SGR2 expression is highly up-regulated, similarly to SGR1 expression. Here we show that SGR2 function counteracts SGR1 activity in leaf Chl degradation; SGR2-overexpressing plants stayed green and the sgr2-1 knockout mutant exhibited early leaf yellowing under age-, dark-, and stress-induced senescence conditions. Like SGR1, SGR2 interacted with LHCII but, in contrast to SGR1, SGR2 interactions with CCEs were very limited. Furthermore, SGR1 and SGR2 formed homo- or heterodimers, strongly suggesting a role for SGR2 in negatively regulat- ing Chl degradation by possibly interfering with the proposed CCE-recruiting function of SGR1. Our data indicate an antagonistic evolution of the functions of SGR1 and SGR2 in Arabidopsis to balance Chl catabolism in chloroplasts with the dismantling and remobilizing of other cellular components in senescing leaf cells.

关键词： Arabidopsis thaliana stay-green SGR1 SGR2 chlorophyll degradation leaf senescence abiotic stress.

Analytical solution for one-dimensional nonlinear consolidation of saturated multi-layered soil under time-dependent loading

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 Ocean Engineering and Science 2021年第1期6卷 21-29页

作者： Pyol Kim Hyong-Sik Kim Chol-U Pak Chung-Hyok paek Gun-Hyang Ri Hak-Bom Myong Faculty of Geology Kim Il Sung UniversityPyongyang 999093Democratic People’s Republic of Korea

This paper presents analytical solutions for one-dimensional nonlinear consolidation of saturated multi-layered soil under time-dependent *** solutions are derived for one-dimensional nonlinear consolidation of multi-layered soil subjected to constant loading and ramp *** proposed solutions are verified through the comparison with the existing solutions for double-layered soil and singlelayered soil,which shows the proposed solutions are more general ones for one-dimensional nonlinear consolidation of saturated soils subjected to time-dependent *** on the proposed solutions,nonlinear consolidation behavior of saturated multi-layered soil under time-dependent loading is investigated.

关键词： Saturated soil Multi-layered Nonlinear consolidation Analytical solution

Effects of tissue-cultured mountain ginseng （Panax ginseng CA Meyer） extract on male patients with erectile dysfunction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2009年第3期11卷 356-361页

作者： Tae-Hwan Kim Seung Hyun Jeon Eun-Joo Hahn Kee-Yoeup paek Jong Kwan Park Nae Young Youn Hyung-Lae Lee Department of Urology School of Medicine Kyung Hee University Seoul 134-727 Korea Research Center for the Development of Advanced Horticultural Technology Chungbuk National University Cheongju 361-711 Korea Department of Urology Chonbuk National University Medical School Jeonju 561-712 Korea Infertility Clinic Sanbornjeil Women＇s Hospital Kunpo 435-042 Korea

Korean ginseng and mountain ginseng （Panax ginseng CA Meyer） are important traditional herbal plants whose ginsenosides are generally accepted as serving to improve sexual functions, such as penile erection. We investigated the effects of tissue-cultured mountain ginseng extract （TMGE） on male patients with erectile dysfunction （ED）. A double-blind, placebo-controlled study was conducted with 143 patients experiencing ED. Over the course of 8 weeks, one group took 1 000 mg of TMGE twice a day, and the other group took 1 000 mg of placebo twice a day. The effects of the TMGE and the placebo were analyzed using the Korean version of the International Index of Erectile Function （IIEF） questionnaire. A total of 86 patients completed 8 weeks of treatment. The scores on the five domains of the IIEF after medication were significantly higher than the baseline scores in the group treated with TMGE （P 〈 0.05）, whereas no significant improvement was observed in the placebo group （P 〉 0.05）. Erectile function and overall satisfaction scores after medication were significantly higher in the TMGE group than in the placebo group （P 〈 0.05）. Erectile function of patients in the TMGE-treated group significantly improved, suggesting that TMGE could be utilized for improving erectile function in male patients.

关键词： erectile dysfunction Panax ginseng tissue-cultured mountain ginseng extract

运动计时系统中的多阅读器算法及其在低频带宽中的应用（英文）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Communications 2013年第12期10卷 16-24页

作者： Min-Ho paek Choon-Seong Leem Dae-Jung Bae Department of Information and Industrial Engineering Yonsei University

In sports timing systems,P2P communication is used at low frequency bandwidths(under 135 KHz) between tags and readers in the RFID ***,in such cases,collisions tend to occur when a reader deals with multiple RFID tags *** overcome this issue,a sports timing system including a Multi Reader Controller(MRC)loaded with an advanced multiple reader algorithm and application was created and applied at large-scale citizens' marathon *** these cases,a large number of people pass over the installed urethane type's antenna mat continually during a short period of *** study verified the superiority of the improved algorithm and application through the on-thespot application of the multi reader algorithm and application program,which allows us to smoothly measure runners' times through multiaccess reading for rapid collision avoidance.

关键词：应用程序改进算法计时系统运动员频率带宽读取 RFID标签多重