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Entanglement properties of disordered quantum spin chains with long-range antiferromagnetic interactions

Physical Review B 2020年第21期102卷 214201-214201页

作者： Y. Mohdeb J. Vahedi N. Moure A. Roshani Hyun-Yong Lee R. N. Bhatt Stefan Kettemann Stephan Haas Department of Physics and Earth Sciences Jacobs University Bremen Bremen 28759 Germany Technische Universität Braunschweig Institut für Mathematische Physik Mendelssohnstr. 3 38106 Braunschweig Germany Department of Physics Sari Branch Islamic Azad University Sari 48164-194 Iran Department of Physics and Astronomy University of Southern California Los Angeles California 90089-0484 USA Department of Applied Physics Graduate School Korea University Sejong 30019 Korea Division of Display and Semiconductor Physics Korea University Sejong 30019 Korea Interdisciplinary Program in EċICT-Culture-Sports Convergence Korea University Sejong 30019 Korea Department of Electrical Engineering Princeton University Princeton New Jersey 08544 USA School of Natural Sciences Institute for Advanced Study Princeton New Jersey 08540 USA Division of Advanced Materials Science Pohang University of Science and Technology (POSTECH) Pohang 790-784 Korea

Entanglement measures are useful tools in characterizing otherwise unknown quantum phases and indicating transitions between them. Here we examine the concurrence and entanglement entropy in quantum spin chains with random long-range couplings, spatially decaying with a power-law exponent α. Using the strong disorder renormalization group (SDRG) technique, we find by analytical solution of the master equation a strong disorder fixed point, characterized by a fixed point distribution of the couplings with a finite dynamical exponent, which describes the system consistently in the regime α>12. A numerical implementation of the SDRG method yields a power-law spatial decay of the average concurrence, which is also confirmed by exact numerical diagonalization. However, we find that the lowest-order SDRG approach is not sufficient to obtain the typical value of the concurrence. We therefore implement a correction scheme which allows us to obtain the leading-order corrections to the random singlet state. This approach yields a power-law spatial decay of the typical value of the concurrence, which we derive both by a numerical implementation of the corrections and by analytics. Next, using numerical SDRG, the entanglement entropy (EE) is found to be logarithmically enhanced for all α, corresponding to a critical behavior with an effective central charge c=ln(2), independent of α. This is confirmed by an analytical derivation. Using numerical exact diagonalization (ED), we confirm the logarithmic enhancement of the EE and a weak dependence on α. For a wide range of partition size l, the EE fits a critical behavior with a central charge close to c=1, which is the same as for the clean Haldane-Shastry model with a power-law-decaying interaction with α=2. Only for small l≪L, in a range which increases with the number of spins N, we find deviations which are rather consistent with the strong disorder fixed point central charge c=ln(2). Furthermore, we find using ED that the conc

关键词： Magnetism Quantum entanglement Disordered systems Doped semiconductors Density matrix methods Exact diagonalization Renormalization group Tensor network methods

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Magnetic Nanocoils: Remote Control of Time-Regulated Stretching of Ligand-Presenting Nanocoils In Situ Regulates the Cyclic Adhesion and Differentiation of Stem Cells (Adv. Mater. 11/2021)

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Advanced materials 2021年第11期33卷

作者： Sunhong Min Min Jun Ko Hee Joon Jung Wonsik Kim Seong-Beom Han Yuri Kim Gunhyu Bae Sungkyu Lee Ramar Thangam Hyojun Choi Na Li Jeong Eun Shin Yoo Sang Jeon Hyeon Su Park Yu Jin Kim Uday Kumar Sukumar Jae-Jun Song Seung-Keun Park Seung-Ho Yu Yun Chan Kang Ki-Bum Lee Qiang Wei Dong-Hwee Kim Seung Min Han Ramasamy Paulmurugan Young Keun Kim Heemin Kang Department of Materials Science and Engineering Korea University Seoul 02841 Republic of Korea Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA International Institute for Nanotechnology Evanston IL USA NUANCE Center Northwestern University Evanston IL USA Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology Daejeon 34141 Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea University Seoul 02841 Republic of Korea Department of Otorhinolaryngology-Head and Neck Surgery Korea University College of Medicine Seoul 08308 Republic of Korea Department of Radiology Molecular Imaging Program at Stanford Stanford University School of Medicine Stanford University Palo Alto CA 94304 USA Department of Chemical Engineering Kongju National University Cheonan 31080 Republic of Korea Department of Chemical and Biological Engineering Korea University Seoul 02841 Republic of Korea Department of Chemistry and Chemical Biology Rutgers University Piscataway NJ 08854 USA College of Polymer Science and Engineering State Key Laboratory of Polymer Materials and Engineering Sichuan University Chengdu 610065 China Department of Radiology Canary Center at Stanford for Cancer Early Detection Stanford University School of Medicine Stanford University Palo Alto CA 94304 USA Department of Biomicrosystem Technology Korea University Seoul 02841 Republic of Korea

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Cover Feature: Quantum Mechanical Calculations for Biomass Valorization over Metal-Organic Frameworks (MOFs) (Chem. Asian J. 9/2021)

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Chemistry – An Asian Journal 2021年第9期16卷

作者： Jyun-Yi Yeh Shih-Cheng Li Celine H. Chen Prof. Kevin C.-W. Wu Prof. Yi-Pei Li International Graduate Program of Molecular Science and Technology (NTU-MST) National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan Taiwan International Graduate Program (TIGP) Academia Sinica No. 128 Sec. 2 Academia Road Taipei 11529 Taiwan Department of Chemical Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan School of Engineering Brown University 184 Hope St Providence RI 02912 United States Center of Atomic Initiative for New Materials National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan

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Development of a Measurement Software for the Characterization of WORM Devices for Novel Memory Storage Applications

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Journal of Computer and Communications 2018年第9期6卷 1-13页

作者： Mirko Congiu Miguel H. Boratto Paride Pica Carlos F. O. Graeff POSMAT—Post-Graduate Program in Materials Science and Technology School of Sciences UNESP—S&#227 o Paulo State University Bauru SP Brazil Department of Chemistry-Piazzale Aldo Moro University of Rome “La Sapienza” Rome RM Italy Department of Physics School of Sciences UNESP—S&#227 o Paulo State University Bauru SP Brazil

We hereby propose a software solution to perform high quality electrical measurements for the characterization of WORM (write-once read many), a new generation memory device which is being intensively studied for non-volatile data storage. The as-proposed software is completely based on .NET framework and sample C# code. The paper performed a relevant measurement based on this software. Working WORM devices, based on a polymeric matrix embedded with gold and copper sulfide nanoparticles, have been used for test measurements. The aim of this paper is to show the main steps to develop a fully working measurement software without using any expensive dedicated software.

关键词： WORM Memristor Electrical Measurements Memory Devices

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Friction riveting (‘FricRiveting’) of 6056 T6 aluminium alloy and polyamide 6: influence of rotational speed on the formation of the anchoring zone and on mechanical performance

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Welding International 2017年第7期31卷 509-518页

作者： Cordeiro de Proença, Bruno Blaga, Lucian Fernandez dos Santos, Jorge Bresciani Canto, Leonardo de Traglia Amancio Filho, Sergio Post-Graduate Programme in Materials Science and Engineering Universidade Federal de São Carlos–UFSCar São Carlos Brazil Centre for Materials and Coastal Research Institute of Materials Research Materials Mechanics Solid State Joining Processes Helmholtz-Zentrum Geesthacht Geesthacht Germany Institute of Polymer Composites Hamburg University of Technology Hamburg Germany

Metal-polymer hybrid structures can be used as an alternative solution for reducing weight and fuel consumption in the transport industry, which aims to minimise the emission of harmful gases that have a greenhouse effect. Friction riveting is a relatively new technique for joining metal-polymer hybrid structures. The process is based on the generation of frictional heat between the components, resulting in the plastic deformation of the end of the metal rivet, which is anchored inside the polymer component. This study assessed the technical feasibility of joining AA 6056 T6 and PA6, focusing on the influence of the rotational speed of the rivet on the mechanical performance of the joints. The maximum temperature reached during the process increased with the rotational speed, from 291 ± 6 °C with 10,000 rev/min to 375 ± 5 °C with 15,000 rev/min. The use of higher rotational speeds led to the tip of the rivet undergoing plastic deformation during the friction phase. This produced mechanically stronger joints, because the metal rivet was anchored more securely in the polymer block. The AA 6056 T6-PA6 joints perform well in terms of tensile strength, reaching 85% of the tensile strength of the metal rivet. We therefore confirmed that it is possible to join AA 6056 T6 and PA6 using the technique of friction riveting, and that rotational speed directly affects the tensile strength of the joints. © 2017 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Tensile strength

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Influence of MIG/MAG Welding Process on Mechanical and Pitting Corrosion Behaviors on the Super-Duplex Stainless Steel SAF 2507 Welded Joints

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materials sciences and Applications 2018年第2期9卷 228-245页

作者： Bruno Leonardy S. Lopes Samuel F. Rodrigues Eden S. Silva Gedeon S. Reis Waldemir dos P. Martins Juvenilson Costa Damascena Valdemar S. Leal Graduate Program in Materials Engineering Federal Institute of Education Science and Technology of Maranh&atilde o—IFMA S&atilde o Luís MA Brazil Engineering Coordination Universidade UNICEUMA S&atilde o Luís MA Brazil

The main objective of this research is to better understand the correlation between the constituent phases presented in the super-duplex steel SAF 2507 when it is under welding process by arc shielding gas MIG-MAG (Metal Inert Gas-Metal Active Gas). Conventional short circuit transfer and derivative STT (Surface Tension Transfer) using the 2594 welding wire as a filler metal and the effects on welding power in hardness, toughness and pitting corrosion are considered here. The results showed that the welding energy (Ew) changed the α/γ-phase’s balance and occasionally formed σ-phase in ferrite grain boundaries which led to changes in hardness, toughness and pitting corrosion resistance in molten zone (MZ), heat activated zone (HAZ) and metal base regions (MB). Furthermore, the increased amount of γ-phase improved the pitting corrosion resistance index (PRENγ) mainly in the MZ. This is due to decrease of α-phase fraction and formation of coarser grains, for higher welding energy. The toughness in the MZ decreased with less formation of γ-phase, coalescence of ferritic grains and localized formation of σ-phase, raising the hardness in the HAZ when the welding energy was lower.

关键词： Super-Duplex Steels Welding Toughness Pitting Corrosion Microhardness

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Fish and seaweed (Eucheuma cotonii) meatball for reducing constipation effect

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AIP Conference Proceedings 2019年第1期2155卷

作者： I. Made Sugitha I. Putu Suparthana Pinky Natalia Samanta 1Food Science and Technology Study Program Faculty of Agricultural Technology Udayana University Bukit Jimbaran Badung Bali Indonesia 2Post-graduate Program Udayana University Bukit Jimbaran Badung Bali Indonesia

Functions of dietary fiber include increasing stool mass and reducing intestinal transit time which can be used to prevent constipation. This study aims to determine the ability of mixed catfish meatballs and sea grass flour to reduce constipation through two stages. The first stage was to get the best meatball quality (ratio of tapioca composition and seaweed flour manipulated at 100%: 0%; 90%: 10%; 80%: 20%; 70%: 30%) followed by the second stage which was in vivo testing for rat with doses of meatballs manipulated at 2 g, 4 g, 6 g and 8 g. Research data were analyzed with one-way variance analysis with a confidence level of 95%. Composition of tapioca and seaweed flour at 70%: 30% was the best fish meatball formula resulting in these data: 64.90% moisture content, 2.00% ash, 5.76% fat, 13.91% protein, 13.43% carbohydrate, total food fiber 5.94%) with sensory value: appearance 8.67 (smooth, not hollow, and bright surface), flavor 7.00 (less fish flavor), taste 6.67 (less meat fish taste), texture 9 (solid, compact, springy). The in vivo test showed that administration of 2 g / 200 g weigh body of rat was able to produce rat feces back to normal condition (47.93% moisture content) with a frequency of defecation 21 times per day (no constipation any more).

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MoSi2N4single-layer: A novel two-dimensional material with outstanding mechanical, thermal, electronic, optical, and photocatalytic properties

arXiv

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arXiv 2020年

作者： Bafekry, A. Faraji, M. Hoat, Do M. Fadlallah, M.M. Shahrokhi, M. Shojaei, F. Gogova, D. Ghergherehchi, M. Department of Physics University of Guilan Rasht41335-1914 Iran Department of Physics University of Antwerp Groenenborgerlaan 171 AntwerpB-2020 Belgium Micro and Nanotechnology Graduate Program TOBB University of Economics and Technology Sogutozu Caddesi No 43 Sogutozu Ankara06560 Turkey Computational Laboratory for Advanced Materials and Structures Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City Viet Nam Department of Physics Faculty of Science Benha University Benha13518 Egypt University Lyon ENS de Lyon CNRS Universit Claude Bernard Lyon 1 Laboratoire de Chimie UMR 5182 LyonF-69342 France Department of Chemistry Faculty of Sciences Persian Gulf University Bushehr75169 Iran Department of Physics University of Oslo P.O. Box 1048 Blindern Oslo Norway College of Electronic and Electrical Engineering Sungkyun Kwan University Suwon Korea Republic of

Very recently, the two-dimensional (2D) form of MoSi2N4has been successfully fabricated [Hong et al., Sci. 369, 670 (2020)]. Motivated by theses recent experimental results, herein we investigate the structural, mechanical, thermal, electronic, optical and photocatalytic properties using hybrid density functional theory (HSE06-DFT). Phonon band dispersion calculations reveal the dynamical stability of MoSi2N4monolayer structure. Furthermore, the mechanical study confirms the stability of MoSi2N4monolayer. As compared to the corresponding value of graphene, we find the Young's modulus decreases by ∼ 30% while the Poisson's ratio increases by ∼ 30%. In addition, its work function is very similar to that of phosphorene and MoS2 monolayers. The electronic structure investigation shows the MoSi2N4monolayer is an indirect bandgap semiconductor. We have determined the bandgap using the HSE06 (GGA) is 2.35 (1.79) eV, which is an overestimated (underestimated) value of the experimental bandgap (1.99 eV). The thermoelectric study shows a good thermoelectric performance of the MoSi2N4monolayer with a figure of merit slightly larger than unity at high temperatures. The optical analysis using the RPA method constructed over HSE06 shows that the first absorption peak of the MoSi2N4monolayer for in-plane polarization is located in the visible range of spectrum, i.e. it is a promising candidate for advancing optoelectronic nanodevices. The photocatalytic study indicates the MoSi2N4monloayer can be a promising photocatalyst for water splitting as well as and CO2 reduction. In summary, the fascinating MoSi2N4monloayer is a promising 2D material in many applications due to its unique physical properties. Copyright © 2020, The Authors. All rights reserved.

关键词： Molybdenum compounds

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Chemical composition, minerals, physicochemical properties and antioxidant activity in camu camu seed oil

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Chemical Engineering Transactions 2018年 64卷 325-330页

作者： Filho, Diógenes de Melo Fiho, Antonio A. Magalhães Neto, Agenor T. Santos, Ricardo C. Chagas, Edvan A. Chagas, Pollyana C. Montero, Ismael F. de Sousa, Rita de Cássia P. Post-Graduate Program in Chemistry PPGQ Center for Research and Graduate Studies in Science and Technology NPPGCT Federal University of Roraima Paricarana Campus Boa Vista-RRCEP 69304-000 Brazil Post-Graduate Program in Chemistry PPGQ Center for Research and Graduate Studies in Science and Technology NPPGCT Departament of Chemistry and Post-Graduate in Biotechnology and Biodiversity Program RedeBionorte Federal University of Roraima Paricarana Campus Boa Vista-RRCEP 69304-000 Brazil Departament of Chemistry Federal University of Roraima Paricarana Campus Boa Vista-RRCEP 69304-000 Brazil National Postdoctoral Program of CAPES PNPD/CAPES associated to the Postgraduate Program in Agronomy of Federal University of Roraima POSAGRO/UFRR Campus Cauamé BR 174 s/n Km 12 District Monte Cristo Boa Vista-RRCEP 69310-250 Brazil Brazilian Agricultural Research Corporation Embrapa Rodovia 174 Km 8 Industrial District Boa VistaRRCEP 69301970 Brazil Embrapa Rodovia 174 Km 8 Industrial District Boa VistaRRCEP 69301970 Brazil Post Graduate in Agronomy POSAGRO UFRR Campus Paricarana Boa Vista-RRCEP 69304-000 Brazil Post-Graduate in Biotechnology and Biodiversity Program RedeBionorte Federal University of Roraima Paricarana Campus Boa Vista-RRCEP 69304-000 Brazil

ISBN: (纸本)9788895608563

The aim of this work was to perform chemical and physicochemical analysis of oil of the camu camu (Myrciaria dubia (H.B.K) Mc Vaugh) seeds obtained at Caçari beach, on the banks of the Cauamé river, in Boa Vista city, Roraima state, Brazil. From the seeds, the dark green oil was 2.88% yield. The physical and chemical properties of the oil through the1H and13C NMR spectra: iodine content (55.39 g I2 100g-1), saponification index (178.14 mg KOH g-1), acidity (1.46 mg KOH g-1), olefinic/aliphatic hydrogen ratio (0.36), average molecular weight (934.16 g mol-1). Analysis of the signal displacements in1H and13C NMR spectra confirmed the presence of the fatty acid functional groups and unsaturated fatty acid unsaturations, so the concentration of linolenic acid was 0.43%, acid 12.02% oleic, oleic was 62.49% and saturated fatty acids 25.10%. The quantitative analysis of minerals by ICP-OES showed concentrations of elements: K, Na, P, Si (> 100 ppm);Mg, S (10 to 100 ppm) and Ti (-1). Copyright © 2018, AIDIC Servizi S.r.l.

关键词： Physicochemical properties

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a-Tocopherol in amazon fruits

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Chemical Engineering Transactions 2018年 64卷 229-234页

作者： Ribeiro, Pedro R. E. Santos, Ricardo C. Chagas, Edvan A. de Melo Filho, Antonio A. Montero, Ismael F. Chagas, Pollyana C. Abreu, Herliana D. F. de Melo, Ana Cristina G. R. Post-Graduate in Natural Resources Program Federal University of Roraima Boa Vista-RRCEP 69304-000 Brazil National Postdoctoral Program of CAPESassociated to POSAGRO/UFRR Campus Cauamé BR 174 s/n Km 12 District Monte Cristo Boa Vista-RRCEP 69310-250 Brazil Embrapa Rodovia 174 Km 8 Industrial District Boa Vista-RRCEP 69301970 Brazil Post-Graduate Program in Chemistry Center for Research and Graduate Studies in Science and Technology UFRR and Chemistry Department Campus Paricarana Boa Vista-RRCEP 69304-000 Brazil Post Graduate Program in Biodiversity and Biotechnology Bionorte State Coordination of Roraima UFRR Campus Paricarana Boa Vista-RRCEP 69304-000 Brazil Post Graduate in Agronomy UFRR Campus Paricarana Boa Vista-RRCEP 69304-000 Brazil

ISBN: (纸本)9788895608563

The aim of this work was to perform analysis of the a-tocopherol content by HPLC in Amazonian fruits consumed in Roraima state, Brazil, namely: ata brava, açaí, bacaba, buriti, buritirana, yellow murici, red murici, piaçaba braba, pupunha varieties red and yellow and tucumanzinho. A high concentration of the vitamin in the açaí pulp (1101.11 mg L-1) and of the ata brava seeds (644.27 mg L-1) was observed, but other fruits such as buritirana pulp (166.34 mg L-1), red murici (179.52 mg L-1), and piaçaba brava (8.77 mg L-1) presented low amounts of a-tocopherol. As for the yellow and red varieties of pupunha and the tucumanzinho, no presence of the isomer was detected. Identification and quantification of a-tocopherol cited in this work are unpublished for the ata brava, buritirana and red murici, as for the other fruits studied there were variations. Amazonian fruits may present a-tocopherol in its lipid composition, which is one of the most bioactive isomers of vitamin E, for this reason. Copyright © 2018, AIDIC Servizi S.r.l.

关键词： Fruits

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