检索结果-内蒙古大学图书馆

arXiv 2022年

作者： Koren, Gil Meir, Sagi Holschuh, Lennard Mertens, Haydyn D.T. Ehm, Tamara Yahalom, Nadav Golombek, Adina Schwartz, Tal Svergun, Dmitri I. Saleh, Omar A. Dzubiella, Joachim Beck, Roy Raymond & Beverly Sackler School of Physics & Astronomy Tel Aviv University Tel Aviv6997801 Israel The Center for Physics & Chemistry of Living Systems Tel Aviv University Tel Aviv6997801 Israel The Center for NanoTechnology & NanoScience Tel Aviv University Tel Aviv6997801 Israel Applied Theoretical Physics-Computational Physics Physikalisches Institut Albert-Ludwigs-Universit Freiburg FreiburgD-79104 Germany European Molecular Biology Laboratory Hamburg Unit Hamburg22607 Germany Faculty of Physics Center for NanoScience Ludwig-Maximilians-Universität MünchenD-80539 Germany School of Chemistry Raymond and Beverly Sackler Faculty of Exact Sciences Tel Aviv University Center for Light-Matter Interaction Tel Aviv University Tel Aviv6997801 Israel The Center for Nanoscience and Nanotechnology Tel Aviv University Tel Aviv69978 Israel BMSE Program University of California Santa BarbaraCA93110 United States Materials Department University of California Santa BarbaraCA93110 United States Cluster of Excellence livMatS @ FIT Freiburg Center for Interactive Materials and Bioinspired Technologies Albert-Ludwigs-Universit Freiburg FreiburgD-79104 Germany

Short-range interactions and long-range contacts drive the 3D folding of structured proteins. The proteins’ structure has a direct impact on their biological function. However, nearly 40% of the eukaryotes proteome is composed of intrinsically disordered proteins (IDPs) and protein regions that fluctuate between ensembles of numerous conformations. Therefore, to understand their biological function, it is critical to depict how the structural ensemble statistics correlate to the IDPs’ amino acid sequence. Here, using small-angle x-ray scattering (SAXS) and time-resolved Förster resonance energy transfer (trFRET), we study the intra-molecular structural heterogeneity of the neurofilament low intrinsically disordered tail domain (NFLt). Using theoretical results of polymer physics, we find that the Flory scaling exponent of NFLt sub-segments correlates linearly with their net charge, ranging from statistics of ideal to self-avoiding chains. Surprisingly, measuring the same segments in the context of the whole NFLt protein, we find that regardless of the peptide sequence, the segments’ structural statistics are more expanded than when measured independently. Our findings show that while polymer physics can, to some level, relate the IDP’s sequence to its ensemble conformations, long-range contacts between distant amino acids play a crucial role in determining intra-molecular structures. This emphasizes the necessity of advanced polymer theories to fully describe IDPs ensembles with the hope it will allow us to model their biological function. © 2022, CC BY.

关键词： Proteins

来源：评论

学校读者我要写书评

暂无评论

Tuning the Morphology and Chiroptical Properties of Discrete Gold Nanorods with Amino Acids

引用

Angewandte Chemie 2018年第50期130卷

作者： Guangchao Zheng Zhiyong Bao Jorge Pérez‐Juste Ruolan Du Wei Liu Jiyan Dai Wei Zhang Lawrence Yoon Suk Lee Kwok‐Yin Wong State Key Laboratory of Chemical Biology and Drug Discovery Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hunghom Kowloon Hong Kong China Department of Applied Physics The Hong Kong Polytechnic University Hunghom Kowloon Hong Kong China Departamento de Química Física y Centro Singular de Investigaciones Biomédicas (CINBIO) Universidad de Vigo Vigo Spain Institute of Applied Physics and Computational Mathematics P. O. Box 8009(28) Beijing 100088 P. R. China

The synthesis of discrete nanostructures with a strong, persistent, stable plasmonic circular dichroism (PCD) signal is challenging. We report a seed‐mediated growth approach to obtain discrete Au nanorods with high and stable chiroptical responses (c‐Au NRs) in the visible to near‐IR region. The morphology of the c‐Au NRs was governed by the concentration of l ‐ or d ‐cysteine used. The amino acids encapsulated within the discrete gold nanostructure enhance their PCD signal, attributed to coupling of dipoles of chiral molecules with the near‐field induced optical activity at the hot spots inside the c‐Au NRs. The stability of the PCD signal and biocompatibility of c‐Au NRs was improved by coating with silica or protein corona. Discrete c‐Au NR@SiO 2 with Janus or core–shell configurations retained their PCD signal even in organic solvents. A side‐by‐side assembly of c‐Au NRs induced by l ‐glutathione led to further PCD signal enhancement, with anisotropic g factors as high as 0.048.

关键词： Aminosäuren Bioverträglichkeit Chiroptische Eigenschaften Gold-Nanostäbe Morphologie

来源：评论

学校读者我要写书评

暂无评论

The atacama cosmology telescope: Delensed power spectra and parameters

arXiv

引用

arXiv 2020年

作者： Han, Dongwon Sehgal, Neelima MacInnis, Amanda van Engelen, Alexander Sherwin, Blake D. Madhavacheril, Mathew S. Aiola, Simone Battaglia, Nicholas Beall, James A. Becker, Daniel T. Calabrese, Erminia Choi, Steve K. Darwish, Omar Denison, Edward V. Devlin, Mark J. Dunkley, Jo Ferraro, Simone Fox, Anna E. Hasselfield, Matthew Hill, J. Colin Hilton, Gene C. Hilton, Matt Hložek, Renée Hubmayr, Johannes Hughes, John P. Kosowsky, Arthur van Lanen, Jeff Louis, Thibaut Moodley, Kavilan Naess, Sigurd Namikawa, Toshiya Nati, Federico Nibarger, John P. Niemack, Michael D. Page, Lyman A. Partridge, Bruce Qu, Frank J. Schillaci, Alessandro Spergel, David N. Staggs, Suzanne Storer, Emilie Wollack, Edward J. Physics and Astronomy Department Stony Brook University Stony BrookNY11794 United States Center for Computational Astrophysics Flatiron Institute 162 5th Avenue New YorkNY10010 United States School of Earth and Space Exploration Arizona State University TempeAZ85287 United States Department of Applied Mathematics and Theoretical Physics University of Cambridge Wilberforce Road CambridgeCB3 0WA United Kingdom Kavli Institute for Cosmology University of Cambridge Madingley Road CambridgeCB3 OHA United Kingdom Centre for the Universe Perimeter Institute for Theoretical Physics WaterlooONN2L 2Y5 Canada Department of Astrophysical Sciences Princeton University 4 Ivy Lane PrincetonNJ08544 United States Department of Astronomy Cornell University IthacaNY14853 United States NIST Quantum Devices Group 325 Broadway Mailcode 817.03 BoulderCO80305 United States School of Physics and Astronomy Cardiff University The Parade Cardiff WalesCF24 3AA United Kingdom Department of Physics Cornell University IthacaNY14853 United States Department of Physics and Astronomy University of Pennsylvania 209 South 33rd Street PhiladelphiaPA19104 United States Joseph Henry Laboratories of Physics Jadwin Hall Princeton University PrincetonNJ08544 United States Berkeley Center for Cosmological Physics Department of Physics University of California BerkeleyCA94720 United States Lawrence Berkeley National Laboratory One Cyclotron Road BerkeleyCA94720 United States Department of Astronomy and Astrophysics The Pennsylvania State University University ParkPA16802 United States Institute for Gravitation and the Cosmos The Pennsylvania State University University ParkPA16802 United States Department of Physics Columbia University New YorkNY10027 United States Astrophysics Research Centre School of Mathematics Statistics & Computer Science University of KwaZulu-Natal Westville Campus Durban4041 South Africa David A. Dunlap Department of Astronomy and

We present ΛCDM cosmological parameter constraints obtained from delensed microwave background power spectra. Lensing maps from a subset of DR4 data from the Atacama Cosmology Telescope (ACT) are used to undo the lensing effect in ACT spectra observed at 150 and 98 GHz. At 150 GHz, we remove the lensing distortion with an effective efficiency of 30% (TT), 30% (EE), 26% (TE) and 20% (BB);this results in detections of the delensing effect at 8.7σ (TT), 5.1σ (EE), 2.6σ (TE), and 2.4σ (BB) significance. The combination of 150 and 98 GHz TT, EE, and TE delensed spectra is well fit by a standard ΛCDM model. We also measure the shift in best-fit parameters when fitting delensed versus lensed spectra;while this shift does not inform our ability to measure cosmological parameters, it does provide a three-way consistency check among the lensing inferred from the best-fit parameters, the lensing in the CMB power spectrum, and the reconstructed lensing map. This shift is predicted to be zero when fitting with the correct model since both lensed and delensed spectra originate from the same region of sky. Fitting with a ΛCDM model and marginalizing over foregrounds, we find that the shift in cosmological parameters is consistent with zero. Our results show that gravitational lensing of the microwave background is internally consistent within the framework of the standard cosmological model. Copyright © 2020, The Authors. All rights reserved.

关键词： Power spectrum

来源：评论

学校读者我要写书评

暂无评论

Convective Boundary Mixing Processes

引用

Research Notes of the AAS 2022年第2期6卷

作者： Evan H. Anders Adam S. Jermyn Daniel Lecoanet J. R. Fuentes Lydia Korre Benjamin P. Brown Jeffrey S. Oishi CIERA Northwestern University Evanston IL 60201 USA evan.anders@northwestern.edu Center for Computational Astrophysics Flatiron Institute New York NY 10010 USA Department of Engineering Sciences and Applied Mathematics Northwestern University Evanston IL 60208 USA Department of Physics and McGill Space Institute McGill University 3600 rue University Montreal QC H3A 2T8 Canada Department of Applied Mathematics University of Colorado Boulder CO 80309-0526 USA Laboratory for Atmospheric and Space Physics Boulder CO 80303 USA University of Colorado Department of Astrophysical and Planetary Sciences Boulder CO 80309 USA Bates College Department of Physics and Astronomy Lewiston Maine 04240 USA

Convective motions extend beyond the nominal boundaries of a convection zone. These motions mix fluid through multiple mechanisms collectively called 'convective boundary mixing.' In this note, we discuss three distinct fluid dynamical processes: convective overshoot, entrainment, and penetrative convection. We describe the structure of a convective boundary that these processes create. To resolve discrepancies between models and observations, the stellar astrophysics community should distinguish between these processes and parameterize each of them separately in 1D evolutionary models.

关键词： Stellar convective zones Stellar physics Stellar evolutionary models

来源：评论

学校读者我要写书评

暂无评论

Elemental analysis of tsunami soil collected from Aceh of Indonesia using scanning electron microscope-energy dispersive x-ray (SEM-EDX)

引用

AIP Conference Proceedings 2023年第1期2480卷

作者： Muliadi Ramli Rara Mitaphonna Kurnia Lahna Nasrullah Idris Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Syiah Kuala Jl. Syech Abdurrauf No. 3 Darussalam 23111 Banda Aceh Aceh Indonesia Doctoral Program of Mathematics and Applied Sciences Universitas Syiah Kuala 23111 Banda Aceh Indonesia Department of Physics Faculty of Mathematics and Natural Sciences Universitas Syiah Kuala Jl. Syech Abdurrauf No. 3 Darussalam 23111 Banda Aceh Aceh Indonesia

Characterization of soil impacted by 2004 Indian Ocean tsunami giant disaster was carried out using a Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX) for investigating its chemical composition. The soil sample was collected from several part of Aceh province of Indonesia. Aceh region is well known as a worst flood land by the 2004 Indian Ocean tsunami. In this preliminary report, results from SEM-EDX analysis for soil sample collected from West Aceh Regency, the closest region to the earthquake epicenter, are presented. SEM image of the tsunami impacted soil sample shows a characteristic morphology with smaller particles and inhomogenous distribution. This is assumed due to the precipitation of several dissolved chemical elements during inundation by the tsunami water. EDX analysis proved that the tsunami impacted soil sample contaminated by organic components such as C and O, alkali/alkaline earth metals (Ca, Mg, Na, and K) as well as transition metals components including Al, Ti, Fe, Si. On the other hand, this experiment also displayed that oxygen element is a dominant element in the tsunami impacted soil with concentration of 52,57%, followed by carbon of 23.37% and silica of 13.41% (wt). The chemical profile of the tsunami impacted soil observed in this work suggests that SEM-EDX technique is a prospective method for evaluation of chemical composition in any impacted soil samples collected from tsunami affected area of Aceh, Indonesia.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Physical model of discontinuity response in landslide application using geometry normalized electromagnetic system (GNES)

引用

AIP Conference Proceedings 2020年第1期2221卷

作者： Muhammad Syukri Surbakti Bukhari Nazli Ismail Nasrullah Idris Muhammad Isa Elin Yusibani Zakaria Muhammad Nurman Mohd Zubir Mat Jafri 1Department of Physics Faculty of Mathematics and Natural Sciences Universitas Syiah Kuala Jln. SyechAbdul Ra’uf No. 3 Darussalam 23111 Banda Aceh Aceh Indonesia 2Doctorate Program of Mathematics and Applied Science (DMAS) Postgraduate Program Universitas Syiah Kuala Banda Aceh 23111 Indonesia 3SMAN 2 Binjai Jalan Padang No. 8 Binjai 20722 Indonesia 4School of Physics UniversitiSains Malaysia Minden 11800 Penang Malaysia

The discontinuity in a fractured land in landslide application could be represented by the metal defects in the physical modeling that will usually reduce the mass of the metal. The scale factor n is important for interpreting the field data using the physical model data. In this physical modeling (n = 100), the anomaly targets are aluminum plates and aluminum plates with the discontinuities. It is assumed the nonconductive environment. In the free-air condition which has zero conductivity is become representative of this environment. In the zero conductivity, the secondary field from the medium is not presence. In this condition, there are no phase differences between transmitted electromagnetic fields and that was received by the receiver. The discontinuity in this term is any treatment or defect that causes disruption or leads to a reduction in response triggered by the eddy currents. The discontinuities used on the thin plates and flaws will interrupt or reduce the eddy current flow on the plate, thereby reducing the induced voltage on the receiving coil and increasing its effective impedance. This is the basis of eddy current measurement. The electromagnetic field response to a metal that has discontinuities will change the eddy current portion. The eddy current that changes, therefore, will change the second field so that the percent response (% Response) of the receiver in the Geometry Normalized Electromagnetic System (GNES) instrument will also change.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Preliminary report on feasibility of laser induced breakdown spectroscopy (LIBS) coupled with eco-friendly capping material for discriminating heavy metal contaminants in liquid milk

引用

AIP Conference Proceedings 2023年第1期2480卷

作者： Muliadi Ramli Rara Mitaphonna Febriani Saiful Kurnia Lahna Nasrullah Idris Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Syiah Kuala Jl. Syech Abdurrauf No. 3 Darussalam 23111 Banda Aceh Aceh Indonesia Doctoral Program of Mathematics and Applied Sciences Universitas Syiah Kuala 23111 Banda Aceh Indonesia Department of Physics Faculty of Mathematics and Natural Sciences Universitas Syiah Kuala Jl. Syech Abdurrauf No. 3 Darussalam 23111 Banda Aceh Aceh Indonesia

This work was carried out to examine the feasibility of LIBS technique coupled with chitosan adsorbent for heavy metal analysis in liquid sample, namely liquid milk products. Heavy metals contained in the liquid products were trapped on the chitosan surface before being irradiated by a focused laser beam using a LIBS technique. Preliminary results of the emission spectra of the heavy metal (Pb) capped on chitosan can clearly be detected using the LIBS technique. Thus, this proposed method of LIBS coupled with chitosan adsorbent could be a promising, efficient and eco-friendly techniques for analyzing heavy metal contaminants in milk liquid samples.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Preface

Smart Innovation, Systems and Technologies

引用

Smart Innovation, Systems and Technologies 2019年 133卷 v页

作者： Petrov, Igor B. Favorskaya, Alena V. Favorskaya, Margarita N. Simakov, Sergey S. Jain, Lakhmi C. Department of Computer Science and Numerical Mathematics Moscow Institute of Physics and Technology The Moscow Area Dolgoprudny Russia Department of Applied Computational Geophysics Moscow Institute of Physics and Technology The Moscow Area Dolgoprudny Russia Institute of Informatics and Telecommunications Reshetnev Siberian State University of Science and Technology Krasnoyarsk Russia Department of Computational Physics Moscow Institute of Physics and Technology The Moscow Area Dolgoprudny Russia Faculty of Engineering and Information Technology Centre for Artificial Intelligence University of Technology SydneyNSW Australia Faculty of Science and Technology University of Canberra CanberraACT Australia Faculty of Science Liverpool Hope University Liverpool United Kingdom KES International Shoreham-by-Sea United Kingdom

来源：评论

学校读者我要写书评

暂无评论

A Density Functional Theory Study of a Calcium- Montmorillonite: A First Investigation for Medicine Application

引用

Journal of physics: Conference Series 2016年第1期739卷

作者： Triati Dewi Kencana Wungu Muhammad Rifqi Al Fauzan Widayani Suprijadi Department of Physics Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia Research Center for Nanosciences and Nanotechnology Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia Master Program in Computational Science Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia

In this study, we performed structural geometry and electronic properties calculations of calcium - based clay mineral for medicine application using first principles calculation by means of Density Functional Theory. Here, a kind of clay mineral used was Ca- montmorillonite and it is applied as an absorber of dangerous metal contained in a human body, such as Pb, which causes osteoporosis. Osteoporosis is a disease associated with bone mass decreases. Since montmorillonite has ability to exchange its cation (Ca+2), therefore, it plays an important role in preventing or/and cure human bone from osteoporosis. In order to understand how Ca-montmorillonite can do detoxification in the human body, we firstly investigated the mechanism of Pb adsorption on the surface of Ca-montmorillonite in an atomic level point of view. We found that the repulsive interactions between H of OH groups with Ca and Pb yielding the rotation of the H of OH groups of montmorillonite. A relatively small movement of Ca was observed when Pb is adsorbed and the band gap of Ca- montmorillonite becomes 1.87 eV narrow.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Manipulating chiral-spin transport with ferroelectric polarization

arXiv

引用

arXiv 2023年

作者： Huang, Xiaoxi Chen, Xianzhe Li, Yuhang Mangeri, John Zhang, Hongrui Ramesh, Maya Taghinejad, Hossein Meisenheimer, Peter Caretta, Lucas Susarla, Sandhya Jain, Rakshit Klewe, Christoph Wang, Tianye Chen, Rui Hsu, Cheng-Hsiang Pan, Hao Yin, Jia Shafer, Padraic Qiu, Ziqiang Rodrigues, Davi R. Heinonen, Olle Vasudevan, Dilip Íñiguez, Jorge Schlom, Darrell G. Salahuddin, Sayeef Martin, Lane W. Analytis, James G. Ralph, Daniel C. Cheng, Ran Yao, Zhi Ramesh, Ramamoorthy Department of Materials Science and Engineering University of California BerkeleyCA94720 United States Materials Sciences Division Lawrence Berkeley National Laboratory CA94720 United States Department of Electrical and Computer Engineering University of California RiversideCA92521 United States Avenue des Hauts-Fourneaux 5 Esch/AlzetteL-4362 Luxembourg Department of Materials Science and Engineering Cornell University IthacaNY14853 United States Department of Physics University of California BerkeleyCA94720 United States School for Engineering of Matter Transport and Energy Arizona State University TempeAZ85281 United States Department of Physics Cornell University IthacaNY14853 United States Kavli Institute Cornell for Nanoscale Science IthacaNY14853 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Electrical Engineering and Computer Sciences University of California BerkeleyCA94720 United States Applied Mathematics and Computational Research Division Lawrence Berkeley National Laboratory CA94720 United States Department of Electrical Engineering Politecnico di Bari Via Edoardo Orabona 4 BA Bari70126 Italy Materials Science Division Argonne National Laboratory 9700 S Cass Ave LemontIL60439 United States Department of Physics and Materials Science University of Luxembourg 41 Rue du Brill BelvauxL-4422 Luxembourg Department of Physics and Astronomy University of California RiversideCA92521 United States

A collective excitation of the spin structure in a magnetic insulator can transmit spin-angular momentum with negligible dissipation1–5. This quantum of a spin wave, introduced more than nine decades ago6, has always been manipulated through magnetic dipoles7–10, (i.e., time-reversal symmetry). Here, we report the experimental observation of chiral-spin transport in multiferroic BiFeO3, where the spin transport is controlled by reversing the ferroelectric polarization (i.e., spatial inversion symmetry). The ferroelectrically controlled magnons produce an unprecedented ratio of up to 18% rectification at room temperature. The spin torque that the magnons in BiFeO3 carry can be used to efficiently switch the magnetization of adjacent magnets, with a spin-torque efficiency being comparable to the spin Hall effect in heavy metals. Utilizing such a controllable magnon generation and transmission in BiFeO3, an all-oxide, energy-scalable logic is demonstrated composed of spin-orbit injection, detection, and magnetoelectric control. This observation opens a new chapter of multiferroic magnons and paves an alternative pathway towards low-dissipation nanoelectronics. Copyright © 2023, The Authors. All rights reserved.

关键词： Iron compounds

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：