检索结果-南通市图书馆

Large conversion of energy in dielectric elastomers by electromechanical phase transition

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

Acta Mechanica Sinica 2012年第4期28卷 1106-1114页

作者： tong-qing Lu Zhi-Gang Suo State Key Lab for Strength and Vibration of Mechanical Structures International Center of Applied MechanicsSchool of Aerospace EngineeringXi'an Jiaotong University 710049 Xi' an China School of Engineering and Applied Sciences Harvard University CambridgeMA 02138 USA

When air is pumped in, a tubular balloon initially inflates slightly and homogeneously. A short section of the balloon then forms a bulge, which coexists with the unbulged section of the balloon. As more air is pumped in, the bulged section elongates at the expense of the unbulged section, until the entire balloon is bulged. The phenomenon is analogous to the liquid-to-vapor phase transition. Here we study the bulging transition in a dielectric elastomer tube as air is pumped into the balloon and a voltage is applied through the thickness of the membrane. We formulate the condition for coexistent budged and unbulged sections, and identify allowable states set by electrical breakdown and mechanical rupture. We find that the bulging transition dramatically amplifies electromechanical energy conversion. Energy converted in an electromechanical cycle consisting of unbulged and bulged states is thousands of times that in an electromechanical cycle consisting of only unbulged states.

关键词： Dielectric elastomer Bulge Electromechanical energy conversion. Tubular balloon Electromechanical transition

On the Center Problem for Generalized Abel Equations

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2023年第12期39卷 2329-2337页

作者： chang Jian LIU Shao qing WANG School of Mathematics(Zhuhai) Sun Yat-sen UniversityZhuhai 519082P.R.China

This paper is devoted to the conditions of the existence of CC-center for the generalized Abel *** some new original methods,we obtain extended results of the main theorems in the paper by Llibre and Valls(2020)and th... 详细信息

关键词： Generalized Abel equation composition condition center problem

Cloning and sequence analysis of nine novel MYB genes in Taxodiaceae plants

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2014年第4期25卷 795-804页

作者： Yong-quan LU qing JIA Zai-kang tong The Nurturing Station for the State Key Laboratory of Subtropical Silviculture Zhejiang Agriculture and Forestry University

Myeloblastosis （MYB） is one of the largest transcribed factor families in plants. To gain an overall picture of the evolution of MYB genes in relict plants, we cloned nine novel MYB genes in Taxodiaceae plants （ Taxodium distichum, Taxodium ascendens, Cryptomeria japonica var. Sinensis, Cryptomeria japonica cv. Araucarioides, Cryptomer Ja- ponica, Metasequoia glyptostroboides, Cunninghamia lanceolata, Tai- wania cryptomerioides and Glyptostrobus pensilis）. The deduced amino acid sequences for MYBs showed that the nine MYB proteins contained two DNA binding domains. The first domain is from amino acid position 29 to 78, wherein three tryptophanes at 33, 53 and 73 were separated by 19 amino acids, respectively. The second domain is from amino acid position 82 to 127, wherein three tryptophanes at 86, 105 and 124 were separated by 18 amino acids, respectively, whereas the first tryptophane at amino acid position 86 is replaced by a phenylalanine. The characteri- zation of these conserved domains at nine MYBs indicated that they all belong to the R2R3-MYB group. The secondary structure analysis showed that a-helix and 13-turn are the major motifs of the predicted secondary structure of MYBs. The three dimensional model of each MYB protein showed that the structure is like clip, making it more flexi- ble and mobile. The similarities between the nine MYB proteins in Taxodiaceae were calculated. The highest identical value of 99% is be- tween CjsMYB, CjMYB and CjaMYB, whereas the lowest value of 82% is between TaMYB and C1MYB. According to the phylogenetic tree, the distances between different genera were relatively large whereas those within genera were relatively small. As expected, accessions of the same genus formed a subgroup before being grouped with other genera.

关键词： Myeloblastosis Taxodiaceae clone analysis R2R3-MYB group

Development of amplified consensus genetic markers in Taxodiaceae based on Cryptomeria japonica ESTs data

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2013年第3期24卷 503-508页

作者： LU Yong-quan JIA qing tong Zai-kang The Nurturing Station for the State Key Laboratory of Subtropical Silviculture Zhejiang Agriculture and Forestry University

Amplified consensus genetic marker （ACGM） is a PCR-based marker technique that uses primers designed within conserved regions of coding sequences. After a comparison of Cryptomeria japonica and Arabidopsis ESTs to search for conserved sequences, 237 single e-PCR products were obtained. We randomly selected 110 candidate ACGM markers to test. Of the 110 candidate ACGM markers tested, 106 yielded stable and clear PCR products in C. japonica. We then tested the utility of these 106 primer pairs in 10 species, representing 7 genera of Taxodi- aceae. The number of specific amplification primer pairs among those 10 species varied from 49 to 103 （or 46.2±97.2%）. The 106 primer pairs （ACGM loci） were high transferable to Cryptomeria fortunei Hooibrenk （97.2%） but were low in Metasequoia glyptostroboides （46.2%）. The number of PCR bands per primer pair ranged from 1.06 to 1.15, which means that most of the ACGM primers can obtain a single band within these 10 Taxodiaceae species. In summary, our study shows that ACGM is a technique applicable for marker development even in species with limited sequence data.

关键词： ACGM Taxodiaceae Cryptomeriajaponica EST database

Communication-based positioning systems:past,present and prospects

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2012年第6期12卷 601-624页

作者： Guan-Yi Ma qing-Tao Wan tong Gan National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China guanyima @ nao. *** Graduate University of Chinese Academy of Sciences Beijing 100049 China

This paper reviews positioning systems in the context of communication systems. First, the basic positioning technique is described for location based ser- vice （LBS） in mobile communication systems. Then the high integrity global posi- tioning system （iGPS） is introduced in terms of aspects of what it is and how the low Earth orbit （LEO） Iridium telecommunication satellites enhance the global posi- tioning system （GPS）. Emphasis is on the Chinese Area Positioning System （CAPS） which is mainly based on commercial geostationary （GEO） communication satellites, including decommissioned GEO and inclined geosynchronous communication satel- lites. Characterized by its low cost, high flexibility, wide-area coverage and ample frequency resources, a distinctive feature of CAPS is that its navigation messages are generated on the ground, then uploaded to and forwarded by the communication satellites. Fundamental principles and key technologies applied in the construction of CAPS are presented in detail from the CAPS validation phase to its experimental system setup. A prospective view of CAPS has concluded it to be a seamless, high ac- curacy, large capacity navigation and communication system which can be achieved by expanding it world wide and enhancing it with LEO satellites and mobile base stations. Hence, this system is a potential candidate for the next generation of radio navigation after GPS.

关键词： satellite navigation -- communication -- mobile positioning -- CAPS-- iGPS -- LBS

Electronic properties of one-dimensional systems with long-range correlated binary potentials

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2011年第8期20卷 335-339页

作者： Gong Long-Yan tong Pei-qing Zhou Zi-Cong College of Science Nanjing University of Posts and Telecommunications Nanjing 210003 China Department of Physics Nanjing Normal University Nanjing 210097 China Department of Physics Tamkang University 151 Ying-Chuan Tamsui 25137 Taipei Taiwan China

We study numerically the electronic properties of one-dimensional systems with long-range correlated binary potentials. The potentials are mapped from binary sequences with a power-law power spectrum over the entire frequency range, which is characterized by correlation exponent β. We find the localization length ζ increases withβ. At system sizes N →∞, there are no extended states. However, there exists a transition at a threshold ζ. Whenβ 〉 βc, we obtain ζ 〉 0. On the other hand, at finite system sizes, ζ≥ N may happen at certain β, which makes the system ＂metallic＂, and the upper-bound system size N＊（β） is given.

关键词： electronic properties long-range correlation binary potentials localization

Understanding the proteome encoded by “non-coding RNAs”:new insights into human genome

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2020年第7期63卷 986-995页

作者： Shaohua Lu tong Wang Gong Zhang qing-Yu He MOE Key Laboratory of Tumor Molecular Biology and Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes Institute of Life and Health EngineeringCollege of Life Science and TechnologyJinan UniversityGuangzhou 510632China

A great number of non-coding RNAs(ncRNAs) account for the majority of the genome. The translation of these ncRNAs has been noted but seriously underestimated due to both technological and theoretical limitations. Based on the development of ribosome profiling(Ribo-seq), full length translating RNA analysis(RNC-seq) and mass spectrometry technology, more and more ncRNAs are being found to be translated in different organism, and some of them can produce functional peptides. While recently, not only individual new functional proteins, but also a new proteome have been experimentally discovered to be encoded by endogenous lncRNAs and circRNAs. These new proteins are of biological significance, suggesting the connection of the translation of ncRNAs to human physiology and diseases. Therefore, an in-depth and systematic understanding of the coding capabilities of ncRNAs is necessary for basic biology and medicine. In this review, we summarize the advances in the field of discovering this new proteome, i.e. "ncRNA-coded" proteins.

关键词： non-coding RNAs Ribo-seq RNC-seq proteome young gene

Temperature Dependence of Optically Erased Two-Wave Mixing in Ce:KNSBN

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1998年第5期15卷 345-347页

作者： LIU Jin-song LU Ke-qing LIANG chang-hong ZHANG Du-ying TANG Tian-tong Department of Applied Physics Xidian UniversityXi’an 710071 Institute of Electronic and Information Engineering Jiaotong UniversityXi’an 710049

The intensity response of an optically erased photorefractive two-wave mixing to the erase beam is studied by using the coupling wave equation and the band-transport *** concepts of response strength and the minimum response intensity are introduced and their temperature dependence is investigated.A 2-fold increase in the response strength and 4-fold decrease in minimum response intensity have been experimentally observed in Ce:KNSBN at 633 nm when the crystal temperature is raised from 320 to *** experimental results are in agreement with theoretical analysis and show that the response property can be improved by changing the crystal temperature.

关键词： temperature crystal wave

Distribution of Mineral Nutrients and Active Ingredients in Aloe vera Irrigated with Diluted Seawater

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

Pedosphere 2014年第6期24卷 722-730页

作者： JIANG Chao-Qiang QUAN Ling-tong SHI Feng YANG Na WANG chang-Hai YIN Xiao-Ming ZHENG qing-Song College of Resources and Environmental Science Key Laboratory of Marine BiologyNanjing Agricultural University Tobacco Research Institute Anhui Academy of Agricultural Science College of Life Science Nanjing Agricultural University

With increasing demand for irrigation water, agricultural scientists and planners pay more attention to the utilization of diluted seawater as an alternative source for irrigation of crops. A greenhouse pot experiment was conducted to study how seawater stress(SS) affects growth, water content, cationic accumulation, and active ingredients in leaves of Aloe vera after 30 d of growth in nutrient media with 0%(control), 22%(22% SS), and 42%(42% SS) seawater stress. Results indicated the SS did not change dry biomass of leaves and stems, but gradually decreased biomass allocation to roots with increasing seawater stress. Na+and Cl-in A. vera plant did not increase obviously with a big increase in seawater percentage due to low transpiration of Aloe vera. 42% SS decreased N concentration in most plant organs, but did not change or increased P concentration. Seawater stress tended to decrease concentrations of K+and Ca2+in A. vera. However, seawater salinity tended to increase the concentrations of aloin concentration in top(young) and middle leaves, and there was no significant effect of both stresses on aloin concentration in base(old) leaves. The 42% SS treatment decreased polysaccharide concentrations only in the base leaves, but not in top and middle leaves. In summary, supplying suitably diluted seawater for 30 d could increase the qualities and value of A. vera, without substantial effects on shoot dry biomass production.

关键词： aloin growth nutrition distribution polysaccharide seawater irrigation