نتایج جستجو برای: ratio of valley

تعداد نتایج: 21182691  

Journal: :PRX quantum 2021

Electrons confined in silicon quantum dots exhibit orbital, spin, and valley degrees of freedom. The degree freedom originates from the bulk bandstructure silicon, which has six degenerate electronic minima. degeneracy can be lifted wells due to strain confinement, but "valley splitting" two lowest lying valleys is known sensitive atomic-scale disorder. Large splittings are desirable have a wel...

1998
JAMES C. WYANT KATHERINE CREATH

VIII. IX. X. XI. XII. Sign Conventions Aberration-Free Image Spherical Wavefront, Defocus, and Lateral Shift Angular, Transverse, and Longitudinal Aberration Seidel Aberrations A. Spherical Aberration B. Coma C. Astigmatism D. Field Curvature E. Distortion Zernike Polynomials Relationship between Zernike Polynomials and Third-Order Aberrations Peak-to-Valley and RMS Wavefront Aberration Strehl ...

2007
A. C. de Araújo J. P. H. B. Ometto A. J. Dolman

The carbon isotope of a leaf (δCleaf) is generally more negative in riparian zones than in areas with low soil moisture content or rainfall input. In Central Amazonia, the small-scale topography is composed of plateaus and valleys, with plateaus generally having a lower soil moisture status than the valley edges in the dry season. Yet in the dry season, the nocturnal accumulation of CO2 is high...

M. Kamalian and A. Sohrabi Bidar,

This paper presents the complete algorithm of site response analysis of nonhomogeneous topographic structures using transient two-dimensional boundary element method (BEM). Seismic behaviour of various topographic features including canyon, half plane, sedimentary filled valley and ridge sections, subjected to incident SV and P waves are analysed. The analysis shows the efficiency of the propos...

Journal: :Physical review 2021

We test the valley-filtering capabilities of a quantum dot inscribed by locally straining an $\alpha$-$\mathcal{T}_3$ lattice. Specifically, we consider out-of-plane Gaussian bump in center four-terminal configuration and calculate generated pseudomagnetic field having opposite direction for electrons originating from different valleys, resulting valley-polarized currents, conductance between i...

Journal: :Nanoscale 2017
Xiaofang Chen Liangshuai Zhong Xiao Li Jingshan Qi

In this letter we study the valley degeneracy splitting of the transition-metal dichalcogenide monolayer by first-principles calculations. The local magnetic moments are introduced into the system when the transition-metal atoms are adsorbed on the monolayer surface. The Zeeman effect arising from the local magnetic moment at transition-metal atom sites lifts the valley degeneracy. Anomalous ch...

Extended abstract Introduction The attention of forefront foreign researchers has focused on glacier circus. Glacial cirque is the most important pattern of glacial erosion. Deep depressions with steep walls, flat floor or low slope, half-bowl shaped (crescent shaped) are created at high altitudes in the mountains margin by the erosion of mountain glacier (Ahmadi, Feiznia, 2012). Th...

2006
Robert S. Anderson Peter Molnar Mark A. Kessler

[1] Glacial occupation of alpine valleys results in a distinct signature in the long-valley profile, including steepening of the profile in the headwaters, flattening at lower elevations, and a step in the profile at the convergence of headwater tributaries. We present analytic results for glacial erosion patterns by making the following assumptions: (1) the initial profile is linear, (2) the w...

Journal: :Environmental management 2010
Stephen S Warrner Robert U Fischer Ann M Holtrop Leon C Hinz James M Novak

Stream habitat assessments are conducted to evaluate biological potential, determine anthropogenic impacts, and guide restoration projects. Utilizing these procedures, managers must first select a representative stream reach, which is typically selected based on several criteria. To develop a consistent and unbiased procedure for choosing sampling locations, the Illinois Department of Natural R...

Morphotectonic investigations were carried out by the use of morphometric indices which serve as a tool of identification in regions with active tectonic warp. Landforms in active deformation area are produced from relations of tectonic and surficial processes. One of the most significant landforms underground is rivers that are extremely responsive to tectonic movements mainly uplift and tilti...

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