检索结果-南通市图书馆

Quantum model simulations of attosecond electron diffraction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2010年第6期53卷 987-1004页

作者： Peter baum jrn MANZ Axel SCHILD Max-Planck-Institute of Quantum Optics and Ludwig-Maximilians-Universitt München Freie Universitt Berlin Institut für Chemie und Biochemie

Ultrafast diffraction with free attosecond electron pulses promises insight into the four-dimensional motion of charge density inatoms,molecules and condensed matter. Here we consider the quantum dynamics of the electron-electron scattering process on anattosecond time scale. By numerically solving the time-dependent two-electron Schrdinger equation,we investigate the interactionof an incoming keV-range electron wavepacket by the bound electron of an aligned H+2 molecule,using a one-dimensional *** findings reveal the ratio of elastic to inelastic contributions,the role of exchange interaction,and the influence of the molecularelectron density to diffraction. Momentum transfer during the scattering process,from the incoming to the bound electron mediatedby the nuclei,leaves the bound electron in a state of coherent oscillation with attosecond recurrences. Entanglement causes relatedstate-selective oscillations in the phase shift of the scattered electron. Two scenarios of distinguishable and indistinguishable freeand bound electrons yield equivalent results,irrespective of the electronic spins. This suggests to employ the scenario of distinguishable electrons,which is computationally less demanding. Our findings support the possibility of using electron diffraction forimaging the motion of charge density,but also suggest the application of free electron pulses for inducing attosecond dynamics.

关键词： ultrafast electron diffraction scattering theory attosecond dynamics entanglement coherence

Development of a panel of unigene-derived polymorphic EST–SSR markers in lentil using public database information

在线全文

学校读者我要写书评

暂无评论

The Crop journal 2016年第5期4卷 425-433页

作者： Debjyoti Sen Gupta Peng Cheng Gaurav Sablok Dil Thavarajah Pushparajah Thavarajah Clarice j.Coyne Shiv kumar Michael baum Rebecca j.McGee Department of Plant Sciences North Dakota State University ICAR-ARS Indian Institute of Pulses Research Division of Plant Sciences University of Missouri Department of Biodiversity and Molecular Ecology Research and Innovation Centre Fondazione Edmund Mach Agricultural and Environmental Sciences Clemson University International College Beijing China Agricultural University USDA-ARS Western Regional Plant Introduction Station Washington State University BIGM Program International Center for Agricultural Research in the Dry Areas (ICARDA) USDA-ARS Grain Legume Genetics and Physiology Research Unit Washington State University

Lentil(Lens culinaris Medik.), a diploid(2n = 14) with a genome size greater than 4000 Mbp, is an important cool season food legume grown worldwide. The availability of genomic resources is limited in this crop species. The objective of this study was to develop polymorphic markers in lentil using publicly available curated expressed sequence tag information(ESTs). In this study, 9513 ESTs were downloaded from the National Center for Biotechnology Information(NCBI) database to develop unigene-based simple sequence repeat(SSR) markers. The ESTs were assembled into 4053 unigenes and then analyzed to identify 374 SSRs using the MISA microsatellite identification tool. Among the 374 SSRs, 26 compound SSRs were *** pairs for these SSRs were designed using Primer3 version 1.14. To classify the functional annotation of ESTs and EST–SSRs, BLASTx searches(using E-value 1 × 10-5) against the public UniP rot(http://***/) and NCBI(http://***/) databases were performed. Further functional annotation was performed using PLAZA(version3.0) comparative genomics and GO annotation was summarized using the Plant GO slim category. Among the synthesized 312 primers, 219 successfully amplified Lens DNA. A diverse panel of 24 Lens genotypes was used to identify polymorphic markers. A polymorphic set of 57 markers successfully discriminated the test genotypes. This set of polymorphic markers with functional annotation data could be used as molecular tools in lentil breeding.

关键词： Lens culinaris EST-SSRs Functional annotation Unigene sequences EST database Genetic resources

Adenoviral vector-mediated aquaporin-1 gene therapy for radiation-induced parotid hypofunction

在线全文

学校读者我要写书评

暂无评论

Adenoviral vector-mediated aquaporin-1 gene therapy for radi...

2017全国口腔生物医学学术年会

作者： Bruce j baum Molecular Physiology and Therapeutics Branch National Institute of Dental and Craniofacial ResearchNIH

Head and neck cancers are common malignancies worldwide,with most patients treated at least in part with *** salivary glands in the radiation field are often *** improved methods of radiation therapy,radiation-induced...

关键词：

Molecular Characterization of Atlas 66-Derived Wheat Near-Isogenic Lines Contrasting in Aluminum (Al) Tolerance

在线全文

cnki会议

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2007年第5期6卷 522-528页

作者： GUO Pei-guo BAI Gui-hua LI Rong-hua Brett Carver Michael baum College of Life Science Guangzhou University Guangzhou 510006 P.R.China USDA-ARS-PIant Science and Entomology Research Unit 4008 Throckmorton Hall Kansas State University Manhattan KS 66506 USA Department of Plant and Soil Sciences Oklahoma State University 0K74078 USA International Center for Agricultural Research in the Dry Areas （ICARDA） P.O.Box 5466 Aleppo Syria

Aluminum （Al） toxicity is the major limiting factor for wheat growth in acidic soils. Genetic improvement of Al tolerance is one of the most cost-effective solutions to improve wheat productivity. The objective of this study was to characterize near isogenic lines （NILs） contrasting in Al tolerance derived from Atlas 66 in the backgrounds of Al-sensitive cultivars Chisholm and Century using amplified fragment length polymorphism （AFLP） and simple sequence repeat （SSR）. A total of 200 AFLP and 88 SSR primer pairs were screened and 12 markers （11 AFLPs and one SSR） were associated with Al-tolerance in NILs of at least one recurrent parental background. Among them, nine were linked to A1 tolerance in the Chisholm-derived NILs, seven were associated with Al-tolerance in the Century-derived NILs, and three AFLPs derived from the primer combinations of pAG/mGCAG, pCAG/mAGC and pGTG/mGCG, and one SSR, Xwmc331 on chromosome 4D, associated with A1 tolerance in NILs of both recurrent parental backgrounds. Those common markers across two backgrounds may be the major marker loci associated with Al-tolerance in Atlas 66 and could be useful for marker-assisted breeding to improve Al tolerance in wheat. In addition, evaluation of Al tolerance among different genotypes using hematoxylin stain and relative root growth revealed that Atlas 66 was more tolerant to Al stress than the NILs, therefore suggested that the Al-tolerant NILs might not carry all Al-tolerance loci from Arias 66 and inheritance of Al tolerance in Arias 66 is more likely multigenic.

关键词： aluminum (Al) tolerance Triticum aestivum L. molecular marker

An ALE method for compressible multi-material flows on unstructured grids

在线全文

学校读者我要写书评

暂无评论

An ALE method for compressible multi-material flows on unstr...

The 24th International Symposium on Shock Waves

作者： j.D.baum R.Lhner Center for Applied Computational Center SAICMcLean VA 22102USA Institute for Computational Sciences and Informatics George Mason UniversityFairfaxVA 22030USA

IntroductionMulti-material flows, where a moving interface exists between two immiscible fluids, can be found in a variety of engineering problems. Development of numerically accurate and computationally efficient algorithms for multi-material flow simulations remains one of the unresolved issues in computational fluid dynamics. These flow problems are characterized by the existence of material interfaces. The modeling of these complicated free boundaries poses a difficult numerical challenge, as they are either time dependent or unknown a priori and determined as part of the solution. A number of numerical methods exist for solving the interface problems: interface capturing methods (mixed cell methods), level set methods, volume of fluid and interface reconstruction methods, interface tracking methods, free-Lagrange methods. Unfortunately,

关键词：

Individual and Gender Information from Ferret: A Chemical Investigation of Urine in Comparison with Anal Gland Secretion

在线全文

cnki会议

学校读者我要写书评

暂无评论

Individual and Gender Information from Ferret: A Chemical In...

中国动物学会兽类学分会第六届会员代表大会暨学术讨论会

作者： Helena Soini kevin Bruce Donald Weisler Sarah k. Woodley Micheal j. baum Milos Novotny titute for Pheromone Research at Department of Chemistry Indiana University Bloomington IN 47405 nstitute of Zoology Chinese Academy of Sciences Beijing 100080 China titute for Pheromone Research at Department of Chemistry Indiana University Bloomington IN 47405 nstitute of Zoology Chinese Academy of Sciences Beijing 100080 China titute for Pheromone Research at Department of Chemistry Indiana University Bloomington IN 47405 nstitute of Zoology Chinese Academy of Sciences Beijing 100080 China Department of Biology Boston University Boston MA 02215 USA titute for Pheromone Research at Department of Chemistry Indiana University Bloomington IN 47405 titute for Pheromone Research at Department of Chemistry Indiana University Bloomington IN 47405

＜正＞In this study, the novel quantitative stir bar sorptive extraction （SBSE） and thermal desorption gas chromatography-mass spectrometry （GC-MS） method was used to investigate urinary volatiles in comparison wi...

关键词：

在线全文

cnki会议

学校读者我要写书评

暂无评论

涎腺疾病的基因治疗

涎腺疾病的基因治疗

第三届中国国际暨第六届全国口腔颌面外科学术会

作者： Bruce j. baum 弗吉尼亚大学

The concept of transferring genes to tissues for clinical applications has been discussed for ～50 years, but the ability to manipulate genetic material via recombinant DNA technology has brought this

关键词：

Differentially Expressed Genes between Two Barley Cultivars Contrasting in Drought Tolerance

在线全文

cnki会议

学校读者我要写书评

暂无评论

分子植物育种 2007年第2期5卷 181-183页

作者： P.G. Guo　 M. baum　 R.H. Li 　 S. Grando R.k. Varshney　 j. Valkoun　 S. Ceccarelli　 A. Grane College of Life Science Guangzhou University Guangzhou 510006 China International Centre for Agricultural Research in the Dry Areas （ICARDA） P.O. Box 5466 Aleppo Syria Institute of Plant Genetics and Crop Plant Research （IPk） Gatersleben Germany

Drought tolerance is a key trait for increasing and stabilizing barley productivity in dry areas. A number of genes have been described that respond to drought at the transcriptional level (Seki et al., 2002; Cheong e... 详细信息

关键词：基因表达栽培品种干旱耐受性能

在线全文

学校读者我要写书评

暂无评论

插管式换热器的最优化设计

化学工程 1983年第2期 85-89+50页

作者： A.j.baum 王抚华化工部第六设计院

插管式换热器由圆管组成,即由一端密封的外管及在该管中设置的另一根内管构成。在内管底部与外管的封盖之间留有一间隙,这样由中心管及外管环隙构成了流体的通路,热量是由内管的主物流通过外管传递给次物流的。因此在结构上只需对换热... 详细信息

插管式换热器由圆管组成,即由一端密封的外管及在该管中设置的另一根内管构成。在内管底部与外管的封盖之间留有一间隙,这样由中心管及外管环隙构成了流体的通路,热量是由内管的主物流通过外管传递给次物流的。因此在结构上只需对换热器一侧做成受压容器,而且不受弯曲和轴向压缩应力。本文导出了评价插管式换热器性能所需要的基本方程,并将预测结果与一组试验数据进行了比较。介绍了主物流方向及内管直径和壁厚变化的参数影响,论证了可以通过适当的内管尺寸来有效地提高插管式换热器的性能。

关键词：管式换热器内管物流外管管状换热器对流传热系数管壁热阻最优化设计