نتایج جستجو برای: conical lattice structure made of carbon

تعداد نتایج: 21275669  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بیرجند - دانشکده علوم انسانی 1389

نشان می دهیم که هر اشتقاق لی روی یک c^*-جبر به شکل استاندارد است، یعنی می تواند به طور یکتا به مجموع یک اشتقاق لی و یک اثر مرکز مقدار تجزیه شود. کلمات کلیدی: اشتقاق، اشتقاق لی، c^*-جبر.

Journal: :Optics express 2011
Yu-Chieh Huang Chia-Feng Lin Sy-Hann Chen Jing-Jie Dai Guei-Miao Wang Kun-Pin Huang Kuei-Ting Chen Yi-Hsiang Hsu

The conical air-void structure of an InGaN light-emitting diode (LEDs) was formed at the GaN/sapphire interface to increase the light extraction efficiency. The fabrication process of the conical air-void structure consisted of a dry process and a crystallographic wet etching process on an undoped GaN layer, followed by a re-growth process for the InGaN LED structure. A higher light output powe...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه لرستان - دانشکده ادبیات و زبانهای خارجی 1393

rested on sociocultural theory (sct), this study attempted to examine the effect of written corrective feedback (wcf) followed by producing written languaging on developing writing accuracy over new tasks. to this aim, two intact iranian efl classes at the low-intermediate level were randomly assigned to two experimental groups: direct (n = 25) and indirect (n = 25). both groups wrote on a numb...

2003
Gary Pennington Neil Goldsman Thomas Antonsen Gary Wayne Pennington

Title of dissertation: ELECTRON TRANSPORT SIMULATIONS AND BAND STRUCTURE CALCULATIONS OF NEW MATERIALS FOR ELECTRONICS: SILICON CARBIDE AND CARBON NANOTUBES. Gary Pennington, Doctor of Philosophy, 2003 Dissertation directed by: Professor Neil Goldsman Department of Electrical Engineering Silicon carbide (SiC) and carbon nanotubes (CNTs) are two materials which have promising potential in electr...

پایان نامه :دانشگاه تربیت معلم - تهران - دانشکده علوم انسانی 1390

abstract al- muntazam by ibn al -jawzi is one of the greatest the book ancient book of texts on history of islam in the 6th century.it is very important one;because of including rare reports which are not found any where.in addition to historical reports,his outlook , in which embodies information on mythologies, milal wa nihal (sects and creeds), geography, and political, social and religiou...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیخ بهایی - دانشکده زبانهای خارجی 1392

the purpose of this study was to investigate the impact of blended learning and multimedia softwares on iranian efl students vocabulary learning. in addition, the present study tried to examine the extent to which multimedia softwares can be applied into efl classes in iran. it also attempted to find out students attitudes toward using these softwares. to this end, 87 iranian efl learners at el...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه مازندران - دانشکده علوم انسانی و اجتماعی 1388

abstract the present study was conducted to examine the effect of proficiency on students interaction while carrying out the grammar-based task(s) in collaboration. in particular, the study examines whether the level of proficiency affects the learners’ focus of attention to grammatical and lexical features. the study takes a further step and examines whether there is any difference in the use...

2001
Hendrik Willem Christiaan POSTMA Leonid Gurevich Liesbeth Venema Alberto Morpurgo Keith Williams John van Noort

Carbon nanotubes are molecules entirely made of carbon atoms. Owing to their special shape, they are extremely stiff but also very flexible. The electronic properties are determined by the exact symmetry of the nanotube lattice, resulting in either metallic or semiconducting behavior. Due to their small diameter, electronic motion is directed in the length direction of the nanotube, making them...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مهندسی 1392

flow in natural river bends is a complex and turbulent phenomenon which affects the scour and sedimentations and causes an irregular bed topography on the bed. for the reason, the flow hydralics and the parameters which affect the flow to be studied and understand. in this study the effect of bed and wall roughness using the software fluent discussed in a sharp 90-degree flume bend with 40.3cm ...

Journal: :Physical review 2021

We investigate the optical conductivity and far-infrared magneto-optical response of BaNiS$_2$, a simple square-lattice semimetal characterized by Dirac nodal lines that disperse exclusively along out-of-plane direction. With magnetic field aligned line in-plane Landau level spectra show nearly $\sqrt{B}$ behavior, hallmark conical-band dispersion with small spin-orbit coupling gap. The exhibit...

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