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Theoretical Investigation of Structural, Electronic, and Mechanical Properties of Two Dimensional C, Si, Ge, Sn

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Crystal Structure Theory and Applications 2016年第3期5卷 43-55页

作者： rita john Benita Merlin Department of Theoretical Physics University of Madras Guindy Campus Chennai India Department of Electronics and Communication Science Alpha Arts and Science College Chennai India

In this article, we investigate the predictions of the first principles on structural stability, electronic and mechanical properties of 2D nanostructures: graphene, silicene, germanene and stenane. The electronic band structure and density of states in all these 2D materials are found to be generic in nature. A small band gap is generated in all the reported materials other than graphene. The linearity at the Dirac cone changes to quadratic, from graphene to stenane and a perfect semimetalicity is exhibited only by graphene. All other 2D structures tend to become semiconductors with an infinitesimal band gap. Bonding characteristics are revealed by density of states histogram, charge density contour, and Mulliken population analysis. Among all 2D materials graphene exhibits exotic mechanical properties. Analysis by born stability criteria and the calculation of formation enthalpies envisages the structural stability of all the structures in the 2D form. The calculated second order elastic stiffness tensor is used to determine the moduli of elasticity in turn to explore the mechanical properties of all these structures for the prolific use in engineering science. Graphene is found to be the strongest material but brittle in nature. Germanene and stenane exhibit ductile nature and hence could be easily incorporated with the existing technology in the semiconductor industry on substrates.

关键词： 2D Nanomaterials Electronic Band Structure Graphene Silicene Germanene Stenane Mechanical Properties Bonding Characteristics

Theoretical Investigations of Ti-Based Binary Shape Memory Alloys

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Materials Sciences and Applications 2011年第10期2卷 1355-1366页

作者： rita john Hannah Ruben 不详

The electronic structure and ground state properties of TiX (X = Fe, Ni, Pd, Pt and Cu) type Shape Memory alloys have been calculated using the self consistent Tight- Binding Linear Muffin Tin Orbital (TB-LMTO) method. The systematic total energy studies made on TiX alloys in both B2 and (B19/B19’) structures successfully explain the structural stability of these compounds. The equilibrium lattice parameters, bulk moduli (Bo), cohesive energy (Ecoh) and heat of formation (ΔH) are calculated for these systems and compared with the available experimental and other theoretical results. The bonding nature of these TiX alloys is analyzed via the density of states (DOS) histogram.

关键词： Shape Memory Alloys TB-LMTO B2-B19 Phases Structural Parameters

Ab Initio Calculations on Structural, Electronic and Optical Properties of ZnO in Wurtzite Phase

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Crystal Structure Theory and Applications 2016年第2期5卷 24-41页

作者： rita john S. Padmavathi Department of Theoretical Physics University of Madras Chennai India

Self-consistent ab initio calculations are performed on the structural, electronic and optical properties of wurtzite ZnO. The Full Potential Linearized Augmented Plane Wave (FP-LAPW) method is applied to solve the Kohn-Sham equations. Results are obtained by using the PBE-GGA and mBJLDA exchange correlation potentials. The energy and charge convergence have been examined to study the ground state properties. The band structure and Density of States (DOS) diagrams are plotted from the calculated equilibrium lattice parameters. The general profiles of the optical spectra and the optical properties, including the real and imaginary part of dielectric function, reflectivity, refractive index, absorption co-efficient, electron energy loss function and optical conductivity of wurtzite ZnO under ambient conditions are discussed. The optical anisotropy is studied through the calculated optical constants, namely dielectric function and refractive index along three different crystallographic axes.

关键词： w-ZnO DFT mBJLDA Optical Properties

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心理咨询面谈技术

Melon(Cucumis melo)fruit‑specific monoterpene synthase

作者： (美)john Sommers-Flanagan (美)rita Sommers-Flanagan

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Molecular Horticulture 2023年第1期3卷 357-360页

作者： Kathrine H.Davidson Syamkumar Sivasankara Pillai Yukihiro Nagashima Jashbir Singh rita Metrani Kevin MCrosby john Jifon Bhimanagouda Patil Seyednami Niyakan Xiaoning Qian Hisashi Koiwa Department of Horticultural Sciences Vegetable and Fruit Improvement CenterTexas A&M UniversityTX 77843 College StationUSA Texas A&M AgriLife Research and Extension Center 2415 E Business 83WeslacoTX 78596USA Department of Food Science and Technology Texas A&M UniversityCollege StationTX 77843USA Department of Electrical and Computer Engineering Texas A&M UniversityCollege StationTX 77843USA TEES‑AgriLife Center for Bioinformatics&Genomic Systems Engineering Texas A&M UniversityCollege StationTX 77843USA Department of Computer Science and Engineering Texas A&M UniversityCollege StationTX 77843USA Molecular and Environmental Plant Sciences Texas A&M UniversityCollege StationTX 77843USA

Muskmelon(Cucumis melo L.)is one of the important horticultural crops of the Cucurbitaceae *** production of melon fruits was approximately 27 million tons,with the United States production yielding 616,050 tons(FAO 2018).Melon is diploid(2n=24)and has an approximate genome size of 450 Mbp(Arumuganathan and Earle 1991).A high-quality reference genome of melon(DHL92 v4.0)covers 358 Mbp pseudomolecules(Castanera et al.2019).

关键词： crops yielding Melon

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心理咨询面谈技术

心理咨询面谈技术

Clinical Effects of Hydrogen Administration: From Animal and Human Diseases to Exercise Medicine

2001年

作者：（美）rita Sommers-Flanagan （美）john Sommers-Flanagan 陈祉妍等译

本书内容有：第一部分成为一名心理健康工作者；第二部分倾听与关系发展；第三部分面谈结构和评估；第四部分与特殊群体面谈。

关键词：咨询心理学

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International Journal of Clinical Medicine 2016年第1期7卷 32-76页

作者： Garth L. Nicolson Gonzalo Ferreira de Mattos Robert Settineri Carlos Costa rita Ellithorpe Steven Rosenblatt James La Valle Antonio Jimenez Shigeo Ohta Department of Molecular Pathology The Institute for Molecular Medicine Huntington Beach USA Laboratory of Ion Channels School of Medicine Universidad de la República Montevideo Uruguay Sierra Research Irvine USA Tustin Longevity Center Tustin USA Saint john’s Health Center Santa Monica USA Progressive Medical Center Orange USA Hope Cancer Institute Playas de Tijuana Mexico Department of Biochemistry and Cell Biology Graduate School of Medicine Nippon Medical School Kawasaki Japan

Here we review the literature on the effects of molecular hydrogen (H2) on normal human subjects and patients with a variety of diagnoses, such as metabolic, rheumatic, cardiovascular and neurodegenerative and other diseases, infections and physical and radiation damage as well as effects on aging and exercise. Although the effects of H2 have been studied in multiple animal models of human disease, such studies will not be reviewed in depth here. H2 can be administered as a gas, in saline implants or infusions, as topical solutions or baths or by drinking H2-enriched water. This latter method is the easiest and least costly method of administration. There are no safety issues with hydrogen;it has been used for years in gas mixtures for deep diving and in numerous clinical trials without adverse events, and there are no warnings in the literature of its toxicity or long-term exposure effects. Molecular hydrogen has proven useful and convenient as a novel antioxidant and modifier of gene expression in many conditions where oxidative stress and changes in gene expression result in cellular damage.

关键词： Anti-Oxidant Hydrogen Therapy Gene Regulation Gamates Inflammatory Disease Neurodegenerative Disease Rheumatic Disease Infections Aging Exercise Metabolic Disease Ischemia Cardiovascular Disease Neuromuscular Disease Radiation Skin Sepsis

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音质腔式与发音教学

外语教学理论与实践 1984年第2期 27-27页

作者： john H.Esling rita F.Wong 田石

音质腔式(voice quality settings)指发音时喉、舌、唇、软颚等习惯采取的姿势,可用来描写ESL学生的口音特征,并帮助说英语的非本族语者改进发音. 在美国,宽式音质腔式可包括以下特征:(1)双唇平展,(2)下颚张开,(3)舌位颚化,(4)卷舌发音,... 详细信息

音质腔式(voice quality settings)指发音时喉、舌、唇、软颚等习惯采取的姿势,可用来描写ESL学生的口音特征,并帮助说英语的非本族语者改进发音. 在美国,宽式音质腔式可包括以下特征:(1)双唇平展,(2)下颚张开,(3)舌位颚化,(4)卷舌发音,(5)鼻音,(6)喉头放低,(7)音域低. 并非所有方言区都有同样的特征,有些地区甚至可以具有截然相反的特征,但包含上述某些特征的腔式十分普遍,学生很容易看到并学会区分这些发音习惯。双唇平展,

关键词：腔式发音说英语音质声性质英国英语

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万事通奥利佛之钻石大考验

空中英语教室（初级版．大家说英语） 2020年第8期 14-16,51页

作者： john Ryan PAGE DESIGN BY MICHELLE TI ILLUSTRATED BY ARNOLD L EE

奥利佛·沛吉在一家图书馆工作。他非常喜欢在书堆当中工作,他的许多朋友也都爱书,他的同事杰洛德就是一个例子。有一天,杰洛德来到奥利佛的办公桌前,很兴奋地说。“奥利佛,我需要告诉你一件事,”杰洛德兴奋地说,“我要结婚了!”

关键词：爱书图书馆洛德办公桌兴奋