检索结果-内蒙古大学图书馆

arXiv 2018年

作者： Folland, T.G. Fali, A. White, S.T. Matson, J.R. Liu, S. Aghamiri, N.A. Edgar, J.H. Haglund, R.F. Abate, Y. Caldwell, J.D. Department of Mechanical Engineering Vanderbilt University NashvilleTN37212 United States Department of Physics and Astronomy University of Georgia AthensGA30602-2451 United States Department of Physics and Astronomy Vanderbilt University NashvilleTN37235 United States Interdisciplinary Materials Science Program Vanderbilt University NashvilleTN37212 Department of Chemical Engineering Kansas State University ManhattanKS66506 United States

Metasurfaces offer the potential to control light propagation at the nanoscale for applications in both free-space and surface-confined geometries1-3. Existing metasurfaces frequently utilize metallic polaritonic4 elements with high absorption losses5, and/or fixed geometrical designs that serve a single function. Here we overcome these limitations by demonstrating a reconfigurable hyperbolic6 metasurface comprising of a heterostructure of isotopically enriched hexagonal boron nitride (hBN)7-10 in direct contact with the phase-change material (PCM) vanadium dioxide (VO2)11-14. Spatially localized metallic and dielectric domains in VO2 change the wavelength of the hyperbolic phonon polaritons (HPhPs) supported in hBN by a factor 1.6 at 1450cm-1. This induces in-plane launching, refraction and reflection of HPhPs in the hBN, proving reconfigurable control of in-plane HPhP propagation at the nanoscale15. These results exemplify a generalizable framework based on combining hyperbolic media and PCMs in order to design optical functionalities such as resonant cavities, beam steering, waveguiding and focusing with nanometric control. Copyright © 2018, The Authors. All rights reserved.

关键词： III-V semiconductors

来源：评论

学校读者我要写书评

暂无评论

Application of free surface synthetic schlieren method in determining surface tension from a light floating object

引用

Journal of Physics: Conference Series 2019年第1期1380卷

作者： C Pathommapas S Yapo E Seesomboon N Pussadee Master's Degree Program in Teaching Physics Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Science Department Udomdarunee School Sukhothai 52000 Thailand Department of Mechanical Engineering Faculty of Engineering Chiang Mai University Chiang Mai 50200 Thailand Plasma and Beam Physics Research Facility Department of Physics and Materials Science Chiang Mai University Chiang Mai 50200 Thailand Thailand Center of Excellence in physics Commission on Higher Education 328 Si Ayutthaya Road Bangkok 10400 Thailand

Free surface synthetic schlieren (FS-SS) is a liquid surface topography visualization technique relying on apparent dot pattern displacement due to liquid surface deformation. It has gained attention in the fluid visualization field due to its relatively simple and inexpensive setup. One of the most powerful features of the FS-SS technique is the 3D topography of deformed liquid surface, in which submillimeter scale changes can be readily observed in great detail. The visualization of liquid meniscus at the solid interface is proposed in this study to calculate surface tension by equating the surface tension force with weight of light, floating object with circular geometry. It was found that surface tensions of liquids are much greater than anticipated, suggesting that the effect of buoyant force of displaced liquid due to deformed interface cannot be neglected. When the buoyant force is included, the calculated surface tension of liquids are within 10% of the reference values.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Room-temperature lasing action in GaN quantum wells in the infrared 1.5 µm region

arXiv

引用

arXiv 2018年

作者： Ho, V.X. Al tahtamouni, T.M. Jiang, H.X. Lin, J.Y. Zavada, J.M. Vinh, N.Q. Department of Physics Center for Soft Matter and Biological Physics Virginia Tech BlacksburgVA24061 United States Materials Science & Technology Program College of Arts & Sciences Qatar University Doha2713 Qatar Department of Electrical and Computer Engineering Texas Tech University LubbockTX79409 United States Department of Electrical and Computer Engineering New York University BrooklynNY11201 United States

Large-scale optoelectronics integration is strongly limited by the lack of efficient light sources, which could be integrated with the silicon complementary metal-oxide-semiconductor (CMOS) technology. Persistent efforts continue to achieve efficient light emission from silicon in the extending the silicon technology into fully integrated optoelectronic circuits. Here, we report the realization of room-temperature stimulated emission in the technologically crucial 1.5 µm wavelength range from Er-doped GaN multiple-quantum wells on silicon and sapphire. Employing the well-acknowledged variable stripe technique, we have demonstrated an optical gain up to 170 cm-1 in the multiple-quantum well structures. The observation of the stimulated emission is accompanied by the characteristic threshold behavior of emission intensity as a function of pump fluence, spectral linewidth narrowing and excitation length. The demonstration of room-temperature lasing at the minimum loss window of optical fibers and in the eye-safe wavelength region of 1.5 µm are highly sought-after for use in many applications including defense, industrial processing, communication, medicine, spectroscopy and imaging. As the synthesis of Er-doped GaN epitaxial layers on silicon and sapphire has been successfully demonstrated, the results laid the foundation for achieving hybrid GaN-Si lasers providing a new pathway towards full photonic integration for silicon optoelectronics. Driven by the strong need for cheap and integrable Si-based optoelectronic devices for a wide range of applications, continuing endeavors have been made to develop structures for light emission, modulation, and detection in this material system. Recent breakthroughs including the demonstration of a high-speed optical modulator in Si,1-2 photodetectors3, and waveguides4 have brought the concept of transition from electrical to optical interconnects closer to realization. However, the base for silicon photonics, namely, a group IV la

关键词： Semiconductor quantum wells

来源：评论

学校读者我要写书评

暂无评论

Fast Degrading Bioactive Elastic Scaffold Loaded with Neural Stem Cells Promote Rapid Spinal Cord Regeneration

SSRN

引用

SSRN 2019年

作者： Gong, Zhe Lei, Dong Yu, Chao Wang, Chenggui Xia, Kaishun Shu, Jiawei Ying, Liwei Du, Jiangnan Zhou, Xiaopeng Wang, Jingkai Huang, Xianpeng Ni, Licheng Wang, Cong Lin, Jingquan Yu, Wei Hu, Bin Li, Liming Gao, Jianqing Li, Yusheng He, Chuanglong Chen, QiXin Wang, Yang Li, Fangcai Belmonte, Juan Carlos Izpisua You, Zhengwei Liang, Chengzhen Department of Orthopedics 2nd Affiliated Hospital School of Medicine Zhejiang University #88 Jie Fang Road Hangzhou 310009 Zhejiang China Orthopedics Research Institute of Zhejiang University No. 88 Jiefang Road Hangzhou310009 China College of Materials Science and Engineering Donghua University 2999 North Renmin Road Shanghai201620 China Institute of Pharmaceutics College of Pharmaceutical Sciences Zhejiang University Zhejiang Hangzhou310058 China Department of Neurosurgery Second Affiliated Hospital School of Medicine Zhejiang University Hangzhou China The Salk Institute for Biological Studies San diegoCA United States Department of Orthopedics Xiangya Hospital Central South University Changsha410008 China College of Chemistry Chemical Engineering and Biotechnology Donghua University Shanghai201620 China Gene Expression Laboratory

Despite decades of research, spinal cord injury (SCI) still causes irreparable damage to the human body. Key challenges that must be overcome include the glial scars and inflammatory responses within the injury site that hinder the regeneration and extension of neurons following SCI. Transplantation of neural stem cells (NSCs) represents a promising SCI therapy, but these approaches still do not result in comprehensive recovery due to the limited neuronal differentiation of NCSs. Recently, functional scaffolds have been combined with NSCs to treat SCI. Accordingly, we therefore fabricated elastic poly (sebacoyl diglyceride) (PSeD) scaffolds with similar mechanical properties to natural spinal cord. Then, poly (sebacoyl diglyceride)-isoleucine-lysine-valine-alanine-valine-serine (PSeD-IKVAVS) was coated on the PSeD scaffolds to create a bioactive interface. The resultant scaffolds loaded with NSCs were implanted in a complete transection model of SCI in the rat. Graft integrated well with host spinal cord. Grafted NSCs exhibited neuronal differentiation rather than typical scar and very few inflammatory cells infiltrated the lesion site, leading to the significant functional recovery of the rats in 4 weeks. Next, our in vitro analyses showed that degradation products of PSeD-IKVAVS promoted NSCs differentiate into neurons, inhibited neuronal apoptosis induced by hydrogen peroxide, and alleviated inflammation stimulated by lipopolysaccharide (LPS). Overall, we demonstrated PSeD-IKVAVS scaffold containing the characteristics of suitable mechanical properties, bioactivity and fast degradability combined with NSCs would significantly promote neuronal regeneration indicating a novel approach for effectively treating SCI. © 2019, The Authors. All rights reserved.

关键词： Patient rehabilitation

来源：评论

学校读者我要写书评

暂无评论

An experimental study on friction and wear of polyethylene with rice-husk

An experimental study on friction and wear of polyethylene w...

引用

International Conference on engineering Tribology and Applied Technology, ICETAT 2016

作者： Chang, Yuh-Ping Lin, Richard Wang, Hsiang-Yu Chu, Li-Ming Ho, Te-Chuan Department of Mechanical Engineering Kun Shan University Tainan710 Taiwan Department of Mechanical Engineering Centre for Advanced Composite Materials University of Auckland New Zealand Department of Applied Science Interdisciplinary Program of Green and Information Technology National Taitung University Taiwan Department of Refining and Manufacturing Research Institute Chinese Petroleum Corporations Taiwan

ISBN: (纸本)9783035710762

As global policy has devoted much effort to promoting energy conservation and carbon reduction over the past few decades, low energy consumption and less pollution have become the future trends. Moreover, with natural resources gradually turning deficient gradually, it is very important for Taiwan to further establish key technologies from reprocessed natural resources as soon as possible. The special geographical features of East Asia have always displayed a large amount of rice-husk, and therefore this paper investigates the green technology of thermoplastic polymerization with rice-husk. This paper clarifies the adhesive wear and tribological properties to evaluate the anti-slip performance of the reprocessed natural resources step by step and uses a self-developed reciprocating friction tester with measurement systems. To monitor the tribological behaviors between the interfaces, the responses of friction coefficient are recorded during the friction processes. After each test, wear loss is measured by an accuracy balance and OM is utilized to observe the worn surface. Therefore, the anti-slip performance of the reprocessed natural resources can be evaluated and a better agricultural economy can thus be obtained. © 2017 Trans Tech Publications, Switzerland.

关键词： Polymerization

来源：评论

学校读者我要写书评

暂无评论

Nanoscale voltage enhancement at cathode interfaces in Li-ion batteries

arXiv

引用

arXiv 2017年

作者： Xu, Shenzhen Jacobs, Ryan Wolverton, Chris Kuech, Thomas Morgan, Dane Materials Science Program University of Wisconsin- Madison MadisonWI United States Department of Materials Science and Engineering University of Wisconsin - Madison MadisonWI United States Department of Chemical and Biological Engineering University of Wisconsin - Madison MadisonWI United States Department of Materials Science and Engineering Northwestern University EvanstonIL United States

Interfaces are ubiquitous in Li-ion battery electrodes, occurring across compositional gradients, regions of multiphase intergrowths, and between electrodes and solid electrolyte interphases or protective coatings. However, the impact of these interfaces on Li energetics remains largely unknown. In this work, we calculated Li intercalation-site energetics across cathode interfaces and demonstrated the physics governing these energetics on both sides of the interface. We studied the olivine/olivine-structured LixFePO4/LixMPO4 (x=0 and 1, M=Co, Ti, Mn) and layered/layered-structured LiNiO2/TiO2 interfaces to explore different material structures and transition metal elements. We found that across an interface from a high- to low-voltage material the Li voltage remains constant in the high-voltage material and decays approximately linearly in the low-voltage region, approaching the Li voltage of the low-voltage material. This effect ranges from 0.5-9nm depending on the interfacial dipole screening. This effect provides a mechanism for a high-voltage material at an interface to significantly enhance the Li intercalation voltage in a low-voltage material over nanometer scale. We showed that this voltage enhancement is governed by a combination of electron transfer (from low- to high-voltage regions), strain and interfacial dipole screening. We explored the implications of this voltage enhancement for a novel heterostructured-cathode design and redox pseudocapacitors. Copyright © 2017, The Authors. All rights reserved.

关键词： Lithium-ion batteries

来源：评论

学校读者我要写书评

暂无评论

End-to-end symmetry preserving inter-atomic potential energy model for finite and extended systems

arXiv

引用

arXiv 2018年

作者： Zhang, Linfeng Han, Jiequn Wang, Han Saidi, Wissam A. Car, Roberto Weinan, E. Program in Applied and Computational Mathematics Princeton University United States Institute of Applied Physics and Computational Mathematics China CAEP Software Center for High Performance Numerical Simulation China Department of Mechanical Engineering and Materials Science University of Pittsburgh United States Department of Chemistry and Department of Physics Princeton University United States Princeton Institute for the Science and Technology of Materials Princeton University United States Department of Mathematics Princeton University United States Beijing Institute of Big Data Research China

Machine learning models are changing the paradigm of molecular modeling, which is a fundamental tool for material science, chemistry, and computational biology. Of particular interest is the inter-atomic potential energy surface (PES). Here we develop Deep Potential - Smooth Edition (DeepPot-SE), an end-to-end machine learning-based PES model, which is able to efficiently represent the PES of a wide variety of systems with the accuracy of ab initio quantum mechanics models. By construction, DeepPot-SE is extensive and continuously differentiable, scales linearly with system size, and preserves all the natural symmetries of the system. Further, we show that DeepPot-SE describes finite and extended systems including organic molecules, metals, semiconductors, and insulators with high fidelity. Copyright © 2018, The Authors. All rights reserved.

关键词： Potential energy

来源：评论

学校读者我要写书评

暂无评论

Biomedical materials: Engineered Bacterial Bioreactor for Tumor Therapy via Fenton‐Like Reaction with Localized H2O2Generation (Adv. Mater. 16/2019)

引用

Advanced materials 2019年第16期31卷

作者： Jin‐Xuan Fan Meng‐Yun Peng He Wang Hao‐Ran Zheng Zong‐Lin Liu Chu‐Xin Li Xia‐Nan Wang Xin‐Hua Liu Si‐Xue Cheng Xian‐Zheng Zhang Key Laboratory of Biomedical Polymers of Ministry of Education & Department of Chemistry Wuhan University Wuhan 430072 P. R. China School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China The Institute for Advanced Studies Wuhan University Wuhan 430072 P. R. China

来源：评论

学校读者我要写书评

暂无评论

Author Correction: Development of a functional salivary gland tissue chip with potential for high-content drug screening

Communications biology

引用

Communications biology 2021年第1期4卷 533页

作者： Yuanhui Song Hitoshi Uchida Azmeer Sharipol Lindsay Piraino Jared A Mereness Matthew H Ingalls Jonathan Rebhahn Shawn D Newlands Lisa A DeLouise Catherine E Ovitt Danielle S W Benoit Department of Biomedical Engineering University of Rochester Rochester NY USA. Center for Oral Biology University of Rochester Medical Center Rochester NY USA. Department of Biomedical Genetics University of Rochester Medical Center Rochester NY USA. Department of Dermatology University of Rochester Medical Center Rochester NY USA. Department of Environmental Medicine University of Rochester Medical Center Rochester NY USA. David H. Smith Center for Vaccine Biology and Immunology University of Rochester Medical Center Rochester NY USA. Department of Otolaryngology University of Rochester Medical Center Rochester NY USA. Wilmot Cancer Institute University of Rochester Medical Center Rochester NY USA. Department of Neuroscience University of Rochester Medical Center Rochester NY USA. Materials Science Program University of Rochester Rochester NY USA. Department of Biomedical Engineering University of Rochester Rochester NY USA. benoit@bme.rochester.edu. Center for Oral Biology University of Rochester Medical Center Rochester NY USA. benoit@bme.rochester.edu. Department of Biomedical Genetics University of Rochester Medical Center Rochester NY USA. benoit@bme.rochester.edu. Department of Environmental Medicine University of Rochester Medical Center Rochester NY USA. benoit@bme.rochester.edu. Wilmot Cancer Institute University of Rochester Medical Center Rochester NY USA. benoit@bme.rochester.edu. Materials Science Program University of Rochester Rochester NY USA. benoit@bme.rochester.edu. Department of Chemical Engineering University of Rochester Rochester NY USA. benoit@bme.rochester.edu. Center for Musculoskeletal Research University of Rochester Medical Center Rochester NY USA. benoit@bme.rochester.edu.

来源：评论

学校读者我要写书评

暂无评论

The effect of green supply chain management implementation to marketing performance through company competitiveness (study on paper industry in West Java)

引用

Journal of Physics: Conference Series 2018年第1期1013卷 012165-012165页

作者： Hijuzaman, O Rahayu, A Kusnendi Management Science Doctoral Studies Program School of Graduate Studies Indonesia University of Education Depok Indonesia Industrial Engineering Program STT Wastukancana Purwakarta Indonesia Management Science Doctoral Studies Program School of Graduate Studies Indonesia University of Education Depok Indonesia

The purpose of this study was to determine and analyze the effect of direct and indirect implementation of Green Supply-Chain Management (GSCM) on the Performance Marketing and Competitiveness Mediation Paper Company in West Java province. Object This research is the paper company that existed in West Java Province, which amounts to 30 companies as well as a sample of research, while variables studied are Variable Green Supply- Chain Management, Company Competitiveness Variable and Variable of Paper Marketing Industry Performance in West Java Province. The method used SEM with Variance Based or Component Based with Software used is SmartPLS 3.0. On this research are identified that no effect of Competitiveness on Marketing Performance in Paper Companies in West Java Province.

关键词：

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：