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Probing the Band Structure of Topological Silicon Photonic Lattices in the Visible Spectrum

Physical Review Letters 2019年第11期122卷 117401-117401页

作者： Siying Peng (彭斯颖) Nick J. Schilder Xiang Ni Jorik van de Groep Mark L. Brongersma Andrea Alù Alexander B. Khanikaev Harry A. Atwater Albert Polman Applied Physics California Institute of Technology Pasadena California 91125 USA Center for Nanophotonics AMOLF Science Park 104 1098 XG Amsterdam Netherlands Department of Electrical Engineering City College of City University of New York New York 10031 USA Physics Program The Graduate Center City University of New York 365 Fifth Avenue New York New York 10016 USA Geballe Laboratory for Advanced Materials Stanford University 476 Lomita Mall Stanford California 94305 USA Photonics Initiative Advanced Science Research Center City University of New York 85 St. Nicholas Terrace New York New York 10031 USA

We study two-dimensional hexagonal photonic lattices of silicon Mie resonators with a topological optical band structure in the visible spectral range. We use 30 keV electrons focused to nanoscale spots to map the local optical density of states in topological photonic lattices with deeply subwavelength resolution. By slightly shrinking or expanding the unit cell, we form hexagonal superstructures and observe the opening of a band gap and a splitting of the double-degenerate Dirac cones, which correspond to topologically trivial and nontrivial phases. Optical transmission spectroscopy shows evidence of topological edge states at the domain walls between topological and trivial lattices.

关键词： Nanophotonics Photonic crystals Topological effects in photonic systems

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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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Cover Feature: Synthesis and Photophysical Properties of Hexabenzocoronene-Tetrabenzoporphyrin Architectures (Eur. J. Org. Chem. 40/2020)

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European Journal of Organic Chemistry 2020年第40期2020卷

作者： Michael Ruppel Lampros-Pascal Gazetas Dr. Dominik Lungerich Dr. Norbert Jux Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM) Friedrich-Alexander University Erlangen-Nuremberg Nikolaus-Fiebiger-Str. 10 91058 Erlangen Germany Institute for Basic Science (IBS) 50 Yonsei-ro Seodaemun-gu Center for Nanomedicine 03722 Seoul Republic of Korea Graduate Program of Nano Biomedical Engineering (NanoBME) Advanced Science Institute Yonsei University 03722 Seoul Republic of Korea

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Compressive strength evaluation and phase analysis of pulp capping materials based on carbonate apatite-SCPC using different concentration of SCPC and calcium hydroxide

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Key engineering materials 2018年第1期782卷 15-20页

作者： Cahyanto, Arief Restunaesha, Muga Zakaria, Myrna Nurlatifah Rezano, Andri El-Ghannam, Ahmed Department of Dental Materials Science and Technology Faculty of Dentistry Universitas Padjadjaran Jl. Raya Bandung-Sumedang KM 21 Jatinangor45363 Indonesia Graduate Student of Faculty of Dentistry Universitas Padjadjaran Jl. Raya Bandung-Sumedang KM 21 Jatinangor45363 Indonesia Department of Endodontology and Operative Dentistry Program Study of Dentistry Faculty of Medicine Universitas Jenderal Achmad Yani Jl. Terusan Jenderal Sudirman PO BOX 148 Cimahi Indonesia Department of Anatomy Physiology and Cell Biology Faculty of Medicine Universitas Padjadjaran Jl. Raya Bandung-Sumedang KM 21 Jatinangor45363 Indonesia Department of Mechanical Engineering and Engineering Science University of North Carolina at Charlotte CharlotteNC28223 United States

The mechanical strength of pulp capping material based on carbonate apatite and silica calcium-phosphate composite (CO3Ap-SCPC) is one of the key factors for the success of the material in protecting the vitality of the pulp during the formation of apatite and dentin reparative. Modifying the material in the powder phase was known to increase the mechanical strength. The purpose of this study was to determine whether the addition of SCPC and calcium hydroxide in pulp capping materials based on CO3Ap-SCPC would affect the compressive strength of this pulp capping material. In this study, three cement groups were used, each group consisted of dicalcium phosphate anhydrous and vaterite which added by SCPC concentration 0%, 5% and 10% and calcium hydroxide concentration 0%, 5% and 10%, respectively. All groups were tested by a compressive strength test and X-Ray diffraction (XRD) for phase analysis. The mean value of compressive strength with addition of 0% SCPC and 10% Ca(OH)2 was 16.54 ± 1.35 MPa, addition of 5% SCPC and 5% Ca(OH)2 was 18.55 ± 2.81 MPa, addition of 10% SCPC and 0% Ca(OH)2 was 9.22 ± 1.21 MPa. The addition of SCPC and Ca(OH)2 show statistically significant in compressive strength (p2 could improve the mechanical strength and the apatite formation of the CO3Ap-SCPC pulp capping material. © 2018 Trans Tech Publications, Switzerland.

关键词： Compressive strength

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Synthesis and characterization of a nanostructured matrix of hydrated calcium phosphate 59th

Synthesis and characterization of a nanostructured matrix of...

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59th Brazilian Ceramic Conference, CBC 59

作者： Possamai, Maicon Douglas Camargo, Nelson Heriberto Almeida Floriano-Silva, Daiara Eckstein, Marli Baltazar Roesler Franczak, Priscila Ferraz Universidade do Estado de Santa Catarina UDESC Post-Graduate Materials Science and Engineering PPGCEM Paulo Malschitzki s/n. Zona Industrial Norte JoinvilleSC Brazil

ISBN: (纸本)9783035711158

Bone reconstruction biomaterials are topics of interest in dentistry, orthopedics, scientific, commercial. The most popular bone repairing and reconstruction biomaterials are calcium phosphates. The demand for biomaterials is associated with the chemical and crystallographic characteristics of the human bone apatite. The wet synthesis method is common in the production of nanostructured powders of hydrated calcium phosphates, providing nanoparticles with sizes less than 50nm. This study aimed to synthesize and characterize hydrated calcium phosphate powders in the molar ratio of Ca/P = 1.67. After calcination at temperature 900°C/2h, these powders provide nanostructured hydroxyapatite matrix. The characterization studies were performed with Scanning Electron Microscopy, X-rays diffraction and Infrared Spectroscopy by Fourier Transform. The results show that the synthesis method provides hydrated calcium phosphate powders formed by aggregated and agglomerated nanoparticles. The thermal treatment of hydrated calcium phosphate powder led to formation of hydroxyapatite matrix. © 2017 Trans Tech Publications, Switzerland.

关键词： Synthesis (chemical)

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Inventory control systems with safety stock and reorder point approach 1

Inventory control systems with safety stock and reorder poin...

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1st International Conference on Information and Communications Technology, ICOIACT 2018

作者： Efrilianda, Devi Ajeng Mustafid Isnanto, R. Rizal Master Program of Information Systems School of Post Graduate Studies Diponegoro University Semarang Indonesia Department of Statistics Faculty of Science and Mathematics Diponegoro University Semarang Central Java Indonesia Department of Computer Systems Faculty of Engineering Diponegoro University Semarang Indonesia

ISBN: (纸本)9781538609545

The inventory control systems has an important role to monitor the condition of the goods at the supply chain stage of goods distribution from the central warehouse to retail in accordance with consumer demand. The research aims to develop inventory control systems on the supply chain distribution of goods from suppliers to retail through the central warehouse with minimal supply chain costs. Minimization of supply chain cost using martingale model of forecast evaluation, and the result as the basis for calculation of safety stock and reorder point. The results of research are the system that can be used to control inventory and renewal of goods in the central warehouse by calculating the minimization of supply chain cost based on consumer demand. Case studies were conducted on the supply chain distribution of goods from the central warehouse to the retail in Semarang. The observation data derived from the goods distribution from central warehouse to retail for certain products over 4 time periods. Through such inventory control system, can minimize supply chain cost, and product inventory level can be maintained in time and amount of inventory that must be fulfilled. © 2018 IEEE.

关键词： Supply chains

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Carrier dynamics in SnS2 single crystals and vertical nanostructures: role of edges

Carrier dynamics in SnS2 single crystals and vertical nanost...

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International Conference on Infrared, Millinmeter, and Terahertz Waves

作者： Kateryna Kushnir Erin Morissette Binod Giri Curtis W. Doiron Ronald L. Grimm Pratap M. Rao Lyubov V. Titova Department of Physics Worcester Polytechnic Institute Worcester MA USA Materials Science and Engineering Graduate Program Worcester Polytechnic Institute Worcester MA USA Department of Chemistry and Biochemistry Worcester Polytechnic Institute Worcester MA USA

SnS_2 is a member of the van der Waals 2D layered materials family. Its moderate bandgap, environmental stability and high carrier mobility makes it attractive for solar energy conversion application. We explore how nanostructuring SnS2 in the form of vertically-aligned nanoflakes to increase the surface area impacts the lifetime and microscopic conductivity of photoinjected carriers compared to the bulk SnS2. Increased surface area and the presence of edges is beneficial to the efficiency of SnS2 photoanode performance but it comes at a cost of increased carrier trapping at surface and edge states.

关键词： Scattering Photoconductivity Crystals Photonic band gap Nanoscale devices Probes

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The analysis of thermal performance of vernacular building envelopes in tropical high lands using Ecotect

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IOP Conference Series. Earth and Environmental science 2020年第1期423卷

作者： Hermawan Sunaryo Kholil, A Department of Architecture Qur’anic Science University Jl. Hasyim Asy’ari Km.03 Wonosobo 56351 Indonesia Doctoral Program in Architecture Diponegoro University Jl. Prof Sudarto Semarang 50275 Indonesia Department of Mechanical Engineering Qur’anic Science University Jl. Hasyim Asy’ari Km.03 Wonosobo 56351 Indonesia Department of Post Graduate Qur’anic Science University Jl. Hasyim Asy’ari Km.03 Wonosobo 56351 Indonesia

Climate change affects all areas, including those with low temperature. Wonosobo belongs to highland areas with low temperature. The thermal performance of buildings is influenced by micro-environment climate so that the climate change will affect the thermal performance of buildings. Vernacular buildings are believed to be able to make the occupants comfortable. The vernacular buildings in tropical highlands have either exposed stone walls or wooden walls. The present research seeks to analyze the thermal performance of building envelopes with wooden walls and exposed stone walls in highland areas. Simulation method using the Ecotect software was applied. There are 12 building models with a variety of roofing and flooring were selected. The results of the simulation indicate that the difference between indoor and outdoor temperatures of one model and other models is not significant. Warm temperature mostly occurs in houses with exposed stone walls. Highland areas need much warmth so that cold temperature will not disturb occupants.

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Fabrication and characterization of nano-zirconia produced by aqueous-based tape casting

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materials Today: Proceedings 2017年第11期4卷 11506-11511页

作者： Micheline dos Reis Araújo Wilson Acchar Post-Graduation Program of Science and Materials Engineering Federal University of Rio Grande do Norte (UFRN) Natal Brazil

In this work, aqueous-based tape casting was used to produce nano-zirconia substrates. Rheological properties of the slurries were measured at room temperature. The acrylic-based suspensions showed a pseudoplastic behavior and remained stable and homogeneous. Warm pressing was used to laminate two or more cast tapes, in order to produce SOFC structures. Strength behavior of the sintered and laminates tapes was also evaluated.

关键词： Nano-zirconia Tape casting Rheogical properties

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Transition-Metal Dichalcogenides: Anisotropic Collective Charge Excitations in Quasimetallic 2D Transition-Metal Dichalcogenides (Adv. Sci. 10/2020)

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Advanced science 2020年第10期7卷 2070055-2070055页

作者： Chi Sin Tang Xinmao Yin Ming Yang Di Wu Jing Wu Lai Mun Wong Changjian Li Shi Wun Tong Yung-Huang Chang Fangping Ouyang Yuan Ping Feng Shi Jie Wang Dongzhi Chi Mark B. H. Breese Wenjing Zhang Andrivo Rusydi Andrew T. S. Wee Department of Physics Faculty of Science National University of Singapore S12 Science Drive 3 Singapore 117551 Singapore NUS Graduate School for Integrative Sciences and Engineering National University of Singapore 21 Lower Kent Ridge Singapore 119077 Singapore Singapore Synchrotron Light Source (SSLS) National University of Singapore 5 Research Link Singapore 117603 Singapore Institute of Materials Research and Engineering (IMRE) A*STAR (Agency for Science Technology and Research) 2 Fusionopolis Way Innovis Singapore 138634 Singapore International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Shenzhen University Shenzhen 518060 China School of Physics and Electronics Central South University No. 932 South Lushan Road Changsha Hunan 410083 China Department of Materials Science & Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore Bachelor Program in Interdisciplinary Studies National Yunlin University of Science and Technology 123 University Road Section 3 Douliou Yunlin 64002 Taiwan

In article number https://***/10.1002/advs.201902726 , Xinmao Yin, Andrew T. S. Wee, and co‐workers observe 1D mid‐IR range anisotropic plasmons in quasi‐metallic WSe 2 and MoS 2 monolayers. In‐depth analysis reveals that the long‐range inter‐chain coupling is responsible for the 1D‐charge dynamics and the plasmon energy is dictated by the effects of spin–orbit coupling. Detailed investigation into these collective modes in 2D‐chained systems opens new opportunities for novel device applications and holds significant implications to the underlying mechanism that governs superconductivity in 2D‐transition‐metal dichalcogenide systems.

关键词： anisotropic charge dynamics phase transitions plasmons spectroscopic ellipsometry transition-metal dichalcogenides

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