检索结果-内蒙古大学图书馆

作者： Fallon, James C. Bloomfield, Hannah C. Brayshaw, David J. Sparrow, Sarah N. Wallom, David C. H. Woollings, Tim Brown, Kate Dawkins, Laura Palin, Erika Houben, Nikolaus Huppmann, Daniel Schyska, Bruno U. Department of Meteorology University of Reading Reading United Kingdom Environmental Change Institute University of Oxford Oxford United Kingdom Oxford e-Research Centre Department of Engineering Science University of Oxford Oxford United Kingdom Atmospheric Oceanic and Planetary Physics Department of Physics University of Oxford Oxford United Kingdom Met Office Exeter United Kingdom Energy Economics Group Technische Universität Wien Vienna Austria Energy Climate and Environment Program International Institute for Applied Systems Analysis Laxenburg Austria Oldenburg Germany

2021 Energy-Climate Hackathon: What: Approximately 40 participants-with expertise spanning energy, computer science, and weather and climate research-joined a week-long Energy-Climate data "hackathon"in a run-up to the 2021 UN COP26 conference. Six projects to promote and grow data and science understanding were initiated and developed by teams over the course of the week, supported by access to state-of-the-art computational resources and stimulated by keynote speakers from industry and academia. The hackathon concluded with teams presenting their output to a panel of invited experts. The conference was initiated by University of Oxford Dr. Sarah Sparrow, Professor David Wallom, Professor Tim Woollings, and University of Reading Professor David Brayshaw, Dr. Hannah Bloomfield, in partnership with the Met Office, the United Kingdom's national meteorological service, and with support from the United Kingdom's CEDA-JASMIN service and Gurobi optimization software. When: 18 May (half-day "scoping"event) and 21-25 June 2021 (main hackathon) Where: Online. © 2022 American Meteorological Society.

关键词： Decision support systems

来源：评论

学校读者我要写书评

暂无评论

Persistent Room-Temperature Photodarkening in Cu-Doped β−Ga2O3

引用

Physical Review Letters 2022年第7期128卷 077402-077402页

作者： J. Jesenovec C. Pansegrau M. D. McCluskey J. S. McCloy T. D. Gustafson L. E. Halliburton J. B. Varley Institute of Materials Research Washington State University Pullman Washington 99164-2711 USA Materials Science and Engineering Program Washington State University Pullman Washington 99164 USA Department of Physics and Astronomy Washington State University Pullman Washington 99164-2814 USA Department of Engineering Physics Air Force Institute of Technology Wright-Patterson Air Force Base Dayton Ohio 45433 USA Department of Physics and Astronomy West Virginia University Morgantown West Virginia 26506-6315 USA Lawrence Livermore National Laboratory Livermore California 94551-0808 USA

β−Ga2O3 is an ultrawide band gap semiconductor with emerging applications in power electronics. The introduction of acceptor dopants yields semi-insulating substrates necessary for thin-film devices. In the present work, exposure of Cu-doped β−Ga2O3 to UV light >4 eV is shown to cause large, persistent photo-induced darkening at room temperature. Electron paramagnetic resonance spectroscopy indicates that light exposure converts Cu2+ to Cu3+, a rare oxidation state that is responsible for the optical absorption. The photodarkening is accompanied by the appearance of O─H vibrational modes in the infrared spectrum. Hybrid function calculations show that Cu acceptors can favorably complex with hydrogen donors incorporated as interstitial (Hi) or substitutional (HO) defects. When CuGa−HO complexes absorb light, hydrogen is released, contributing to the observed Cu3+ species and O─H modes.

关键词： Doped semiconductors Semiconductor compounds Wide band gap systems Electron paramagnetic resonance Fourier transform infrared spectroscopy Optical absorption spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Terahertz Magnetospectroscopy of Gadolinium Gallium Garnet in Fields up to 25 T

Terahertz Magnetospectroscopy of Gadolinium Gallium Garnet i...

引用

JSAP-OSA Joint Symposia, JSAP 2021

作者： Bao, J. Peraca, N. Marquez Tay, F. Kritzell, T.E. Li, X. Noe, G.T. Katayama, I. Takeda, J. Nojiri, H. Yamahara, H. Tabata, H. Baydin, A. Kono, J. Department of Physics and Astronomy Rice University HoustonTX United States Department of Electrical and Computer Engineering Rice University HoustonTX United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX United States Department of Physics Graduate School of Engineering Science Yokohama National University Yokohama Japan Institute for Materials Research Tohoku University Sendai Japan Department of Electrical Engineering and Information Systems Graduate School of Engineering University of Tokyo Japan Smalley-Curl Institute Rice University HoustonTX United States Department of Materials Science and NanoEngineering Rice University HoustonTX United States

来源：评论

学校读者我要写书评

暂无评论

Non-Empirical Models for Assessing the Thermal Properties of Nonlinear Polyatomic Molecules

SSRN

引用

SSRN 2025年

作者： Eyube, Edwin Samson Yabwa, D. Onate, C.A. Makama, E.K. Tahir, A.M. Omugbe, E. Makasson, C.R. Umar, U. Department of Physics Faculty of Physical Sciences Modibbo Adama University P.M.B. 2076 Adamawa State Yola Nigeria Department of Physics Faculty of Science Taraba State University P.M.B. 1176 Taraba State Jalingo Nigeria Physics Program College of Agriculture Engineering and Science Bowen University Iwo Osun State Nigeria Department of Physics Faculty of Natural Sciences University of Jos P.M.B. 2084 Plateau State Jos Nigeria Department of Science Laboratory Technology School of Science and Technology Adamawa State Polytechnic P.M.B. 2146 Adamawa State Yola Nigeria Department of Physics University of Agriculture and Environmental Sciences P.M.B. 1038 Imo State Umuagwo Nigeria Department of Physics Modibbo Adama University Secondary School P.M.B. 2076 Adamawa State Yola Nigeria

The current study explores computational models developed using the improved Scarf potential and harmonic oscillator to simulate vibrational modes in nonlinear polyatomic systems. These models are derived from the partition functions of the system and are designed to predict molar Gibbs free energy, entropy, enthalpy, and heat capacity. The models are applied to nonlinear polyatomic molecules, including aluminum chloride (AlCl2), boron difluoride (BF2), and sulfur dioxide (SO2). For Gibbs free energy and entropy, the equations yield a mean percentage relative error (MPRE) of no more than 0.09% compared to NIST data. Furthermore, using the heat capacity expression, MPRE values of 0.968%, 1.035%, and 2.764% are obtained for AlCl2, BF2, and SO2, respectively. These findings are in good agreement with results from existing literature on nonlinear molecules © 2025, The Authors. All rights reserved.

关键词： Free energy

来源：评论

学校读者我要写书评

暂无评论

Near-Unity Emitting, Widely Tailorable and Stable Exciton Concentrators Built from Doubly Gradient 2D Semiconductor Nanoplatelets

arXiv

引用

arXiv 2023年

作者： Liang, Xiao Durmusoglu, Emek G. Lunina, Maria Hernandez-Martinez, Pedro Ludwig Valuckas, Vytautas Yan, Fei Lekina, Yulia Sharma, Vijay Kumar Yin, Tingting Ha, Son Tung Shen, Ze Xiang Sun, Handong Kuznetsov, Arseniy Demir, Hilmi Volkan LUMINOUS Center of Excellence for Semiconductor Lighting and Displays The Photonics Institute School of Electrical and Electronic Engineering Nanyang Technological University Singapore639798 Singapore Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore637371 Singapore Interdisciplinary Graduate Program Nanyang Technological University Singapore637371 Singapore 2 Fusionopolis Way #08-03 Innovis 138634 Singapore UNAM-Institute of Materials Science and Nanotechnology The National Nanotechnology Research Center Department of Electrical and Electronics Engineering Department of Physics Bilkent University Bilkent Ankara06800 Turkey

The strength of electrostatic interactions (EI) between electrons and holes within semiconductor nanocrystals profoundly impact the performance of their optoelectronic systems, and different optoelectronic devices demand distinct EI strength of the active medium. However, achieving a broad range, fine-tuning of the EI strength for specific optoelectronic applications is a daunting challenge, especially in quasi 2-dimensional core-shell semiconductor nanoplatelets (NPLs), as the epitaxial growth of the inorganic shell along the direction of the thickness that solely contributes to the quantum confined effect significantly undermines the strength of the EI. Herein we propose and demonstrate a novel doubly-gradient (DG) core-shell architecture of semiconductor NPLs for on-demand tailoring of the EI strength by controlling the localized exciton concentration via in-plane architectural modulation, demonstrated by a wide tuning of radiative recombination rate and exciton binding energy. Moreover, these exciton-concentration-engineered DG NPLs also exhibit a near-unity quantum yield, remarkable thermal and photo stability, as well as considerably suppressed self-absorption. As proof-of-concept demonstrations, highly efficient color converters and high-performance light-emitting diodes (external quantum efficiency: 16.9%, maximum luminance: 43, 000 cd/m2) have been achieved based on the DG NPLs. This work thus opens up new avenues for developing high-performance colloidal optoelectronic device applications. Copyright © 2023, The Authors. All rights reserved.

关键词： Quantum yield

来源：评论

学校读者我要写书评

暂无评论

Numerical Modeling and Simulation of Dropped Granular Particles on the Curved Surface 11

Numerical Modeling and Simulation of Dropped Granular Partic...

引用

11th National physics Seminar, SNF 2022

作者： Muliyati, D. Sumardani, D. Mutoharoh, M. Sari, N.L.K. Department of Physics Education Universitas Negeri Jakarta Jl. Rawamangun Muka Jakarta13220 Indonesia Pusat Pengembangan Media Digital Universitas Negeri Jakarta Jl. Rawamangun Muka Jakarta13220 Indonesia Teachers College National Chiayi University Chiayi City60004 Taiwan Industry Engineering Study Program Universitas Krisnadwipayana Jatiwaringin Bekasi13077 Indonesia Department of Physics Fakultas Teknik Dan Sains Universitas Nasional Jl. Sawo Manila Pejaten Ps. Minggu Jakarta12520 Indonesia

This study aims to present an approach for analyzing the performance of granular cosmetic adhesion by a numerical simulation using the uFlex particle. To ensure the viability of a numerical simulation, the effect of the process parameters on the dropping granular performance such as curve type, surface moisture level, and curve angle was evaluated. Results suggest that the humidity and curvature angle have significant effects on the density of cosmetic particles on the surface, while the other parameter have relatively small effects. Moreover, the effect of each parameter on the granular adhesion at the surface has been explained by utilizing the particle analysis after the collision. The simulation result shows the adhesion of granular particles with a curved surface leads to better performance under moist surfaces with a convex shape at the angle of 0 degrees. However, on all curvatures, worse adhesion performance under dry surfaces with convex shape. © Published under licence by IOP Publishing Ltd.

关键词： Adhesion

来源：评论

学校读者我要写书评

暂无评论

Giant Thermomechanical Bandgap engineering in Quasi-two-dimensional Tellurium

arXiv

引用

arXiv 2023年

作者： Hussain, Naveed Ahmed, Shehzad Tep, Hüseyin U. Ullah, Kaleem Shahzad, Khurram Wu, Hui Shcherbakov, Maxim R. Department of Electrical Engineering and Computer Science University of California Irvine IrvineCA92697 United States State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China College of Physics and Optoelectronic Engineering Shenzhen University Guangdong518060 China Micro and Nano-Technology Program School of Natural and Applied Sciences Middle East Technical University Ankara06800 Turkey Department of Electrical and Computer Engineering University of Delaware NewarkDE19711 United States Department of Physics Middle East Technical University Ankara06800 Turkey

Mechanical straining-induced bandgap modulation in two-dimensional (2D) materials has been confined to volatile and narrow modulation due to substrate slippage and poor strain transfer. We report the thermomechanical modulation of the inherent bandgap in quasi-2D tellurium nanoflakes (TeNFs) via non-volatile strain induction during hot-press synthesis. We leveraged the coefficient of thermal expansion (CTE) mismatch between TeNFs and growth substrates by maintaining a high-pressure enforced non-slip condition during thermal relaxation (623 to 300K) to achieve the optimal biaxial compressive strain of -4.6 percent in TeNFs/sapphire. This resulted in an enormous bandgap modulation of 2.3 eV, at a rate of up to ~600 meV/%, which is two-fold larger than reported modulation rate. Strained TeNFs display robust band-to-band radiative excitonic blue photoemission with an intrinsic quantum efficiency (IQE) of c.a. 79.9%, making it promising for energy efficient blue LEDs and nanolasers. Computational studies reveal that biaxial compressive strain inhibits exciton-exciton annihilation by evading van-Hove singularities, hence promoting radiative-recombination. Bandgap modulation by such nonvolatile straining is scalable to other 2D semiconductors for on-demand nano(opto)-electronics. Copyright © 2023, The Authors. All rights reserved.

关键词： Energy gap

来源：评论

学校读者我要写书评

暂无评论

Non-Empirical Models for Assessing the Thermal Properties of Nonlinear Polyatomic Molecules

SSRN

引用

SSRN 2025年

作者： Eyube, Edwin Samson Yabwa, D. Onate, C.A. Makama, E.K. Tahir, A.M. Omugbe, E. Makasson, C.R. Umar, U. Department of Physics Faculty of Physical Sciences Modibbo Adama University P.M.B. 2076 Adamawa State Yola Nigeria Department of Physics Faculty of Science Taraba State University P.M.B. 1176 Taraba State Jalingo Nigeria Physics Program College of Agriculture Engineering and Science Bowen University Osun State Iwo Nigeria Department of Physics Faculty of Natural Sciences University of Jos P.M.B. 2084 Plateau State Jos Nigeria Department of Science Laboratory Technology School of Science and Technology Adamawa State Polytechnic P.M.B. 2146 Adamawa State Yola Nigeria Department of Physics University of Agriculture and Environmental Sciences Umuagwo P.M.B. 1038 Imo State Nigeria Department of Physics Modibbo Adama University Secondary School P.M.B. 2076 Adamawa State Yola Nigeria

关键词： Free energy

来源：评论

学校读者我要写书评

暂无评论

Status of Classical Molecular Dynamics Force Fields for Liquid Tri- n -butyl Phosphate with and without Polarization

引用

Chemical engineering Science 2025年

作者： Faranak Hatami Valmor F. de Almeida Dept. of Physics and Applied Physics University of Massachusetts Lowell Lowell MA 01854 USA Dept. of Chemical Engineering (Nuclear Energy Engineering Program) University of Massachusetts Lowell Lowell MA 01854 USA

We present a comprehensive computational molecular dynamics investigation of key properties of tri-n-butyl phosphate of interest in solvent extraction applied to nuclear fuel recycling. Using polarized and nonpolarized force fields, thermodynamic properties (mass density, heat of vaporization, and electric dipole moment) and transport properties (shear viscosity and self-diffusion coefficients) are thoroughly investigated. Transport properties are calculated by equilibrium molecular dynamics simulations, and alternatively, by non-equilibrium simulations. This study reports on the best force fields currently available as judged by the aforementioned properties predictions in comparison to experimental data. It is observed that predictions of thermodynamics properties are accurate when using existing force fields, and that added polarization can improve these predictions using specific force fields when calculating some properties but not in general across all force fields. In contrast, accurate predictions of transport properties are still a challenge whether using polarization or not. For example, thermodynamics properties can be predicted at or below 4.5 % deviation from experiments with the nonpolarized AMBER-DFT model. While transport properties can be best predicted at a combined 62.6 % deviation using the polarized OPLS2005 model (without polarization, results worsen to 75.5 % ). Many models can be used for thermodynamic property predictions at the ≈ 10 % deviation from experimental values using both polarized and non-polarized force fields. This situation is very different for transport properties, for example, the best individual prediction for self-diffusion coefficient deviates − 17.4 % from the experimental value; transport properties are systematically underpredicted by all force fields whether equilibrium or non-equilibrium methods are used.

关键词：

来源：评论

学校读者我要写书评

暂无评论

On the approximability of random-hypergraph MAX-3-XORSAT problems with quantum algorithms

arXiv

引用

arXiv 2023年

作者： Kapit, Eliot Barton, Brandon A. Feeney, Sean Grattan, George Patnaik, Pratik Sagal, Jacob Carr, Lincoln D. Oganesyan, Vadim Department of Physics Colorado School of Mines 1523 Illinois St GoldenCO80401 United States Department of Applied Mathematics and Statistics Colorado School of Mines 1500 Illinois St GoldenCO80401 United States Quantum Engineering Program Colorado School of Mines 1523 Illinois St GoldenCO80401 United States Department of Physics and Astronomy College of Staten Island CUNY Staten IslandNY10314 United States Physics Program and Initiative for the Theoretical Sciences The Graduate Center CUNY New YorkNY10016 United States Center for Computational Quantum Physics Flatiron Institute 162 5th Avenue New YorkNY10010 United States

A canonical feature of the constraint satisfaction problems in NP is approximation hardness, where in the worst case, finding sufficient-quality approximate solutions is exponentially hard for all known methods. Fundamentally, the lack of any guided local minimum escape method ensures both exact and approximate classical approximation hardness, but the equivalent mechanism(s) for quantum algorithms are poorly understood. For algorithms based on Hamiltonian time evolution, we explore this question through the prototypically hard MAX-3-XORSAT problem class. We conclude that the mechanisms for quantum exact and approximation hardness are fundamentally distinct. We review known results from the literature, and identify mechanisms that make conventional quantum methods (such as Adiabatic Quantum Computing) weak approximation algorithms in the worst case. We construct a family of "spectrally filtered" quantum algorithms that escape these issues, and develop analytical theories for their performance. We show that, for random hypergraphs in the approximation-hard regime, if we define the energy to be E = Nunsat - Nsat, spectrally filtered quantum optimization will return states with E ≤ qmEGS (where EGS is the ground state energy) in sub-quadratic time, where conservatively, qm 0.59. This is in contrast to qm → 0 for the hardest instances with classical searches. We test all of these claims with extensive numerical simulations. We do not claim that this approximation guarantee holds for all possible hypergraphs, though our algorithm’s mechanism can likely generalize widely. These results suggest that quantum computers are more powerful for approximate optimization than had been previously assumed. © 2023, CC BY.

关键词： Constraint satisfaction problems

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：