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Structural and optical properties of nanostructured copper sulfide semiconductor synthesized in an industrial mill

Frontiers of Chemical science and Engineering 2019年第1期13卷 164-170页

作者： Marcela Achimovicova Erika Dutkova Erika Tothova Zdenka Bujnakova Jaroslav Briancin Satoshi Kitazono Institute of Mineral and Waste Processing Waste Disposal and Geomechanics Clausthal University of Technology Clausthal 38678 Germany Institute of Geotechnics Slovak Academy of Sciences Kosice 04001 Slovakia Nakase Refinery Nihon Seiko Co. Ltd. Yabu-shi Hyogo 667-1111 Japan

Chalcogenide nanostructured semiconductor, copper sulfide (CuS) was prepared from copper and sulfur powders in stoichiometric ratio by a simple, fast, and convenient one-step mechanochemical synthesis after 40 min of milling in an industrial eccentric vibratory mill. The kinetics of the mechanochemical synthesis and the influence of the physical properties of two Cu powder precursor types on the kinetics were studied. The crystal structure, physical properties, and morphology of the product were characterized by X-ray diffraction (XRD), the specific surface area measurements, particle size distribution and scanning electron microscopy. The XRD analysis confirmed the hexagonal crystal structure of the product-CuS (covellite) with the average size of the crystallites 11 nm. The scanning electron microscopy analysis has revealed that the agglomerated grains have a plate-like structure composed of CuS nanoparticles. The thermal analysis was performed to investigate the thermal stability of the mechanochemically synthesized CuS. The optical properties were studied using UV-Vis and photoluminescence spectroscopy. The determined optical band gap energy 1.80 eV responds to the value of the bulk CuS, because of agglomerated nanoparticles. In addition, a mechanism of CuS mechanochemical reaction was proposed, and the verification of CuS commercial production was performed.

关键词： copper sulfide industrial mechanochemical synthesis thermal analysis optical properties

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Internet-based collaborative pseudo-dynamic testing of multi-span bridge structure

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Progress in Natural science:materials International 2009年第5期19卷 623-633页

作者： Dapeng Wang a, Shizhu Tiana, Xinjiang Caia, Yunlei Fan b, Yan Xiaob,c a School of Civil Engineering, Harbin Institute of technology, Harbin 150090, China b School of Civil Engineering, Hunan University, Changsha 410082, China c Department of Civil Engineering, University of Southern California, Los Angeles, CA 90089, USA School of Civil Engineering Harbin Institute of Technology Harbin 150090 China School of Civil Engineering Hunan University Changsha 410082 China Department of Civil Engineering University of Southern California Los Angeles CA 90089 USA

In this paper, the first Internet-based collaborative pseudo-dynamic testing of a multi-span bridge system in China’s mainland is presented in detail, which has been carried out by the collaboration of Hunan University (HNU), Harbin Institute of technology (HIT) and Tsinghua University (TU) in China’s mainland, and the University of Southern California (USC) in the USA. The prototype system of Russion River Bridge at Southern California in America is illustrated. Different testing specimens, testing equipments and substructure boundary conditions at HNU and HIT laboratories are described. A network protocol platform for collaborative pseudo-dynamic testing, called NetSLab, and some function modules developed on the use of its standardized interface are introduced. Aiming at the MTS system widely used in structural testing, two approaches are presented to implement the communication interface between NetSLab and testing equipment, respectively, studied by HNU and HIT. The integrated networked testing system and collaborative testing procedures are presented. The testing results manifest that the networked collaborative testing system with powerful capability provides a testing platform with good coordination for complex models or actual structures, and achieves remote sharing of testing equipments.

关键词： Internet-based collaborative pseudo-dynamic testing Multi-span bridge structure Network protocol platform Communication interface Remote sharing of testing equipment

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Strategies for Adoption of Circular Economy in the Nigeria Construction Industry

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Journal of Management science & Engineering Research 2023年第2期6卷 47-59页

作者： Abdullahi Idris Abdulkabir Opeyemi Bello Department of Building Federal University of TechnologyMinna920101Nigeria Dollahills Research Lab Dollasoft TechnologiesLagos State101283Nigeria

The concept of circular economy has gained recognition as a way to manage waste and conserve resources sustainably,and has the potential to transform the construction *** is particularly relevant in the construction industry due to the significant amounts of waste generated during the construction and demolition *** study examines the perceived importance and effectiveness of strategies related to the circular economy in the construction *** data were collected through a survey administered to professionals in the construction sector,capturing their perceptions of various *** results reveal that most strategies received high mean ratings,indicating their perceived *** such as waste management and recycling facilities,design for disassembly,and prioritising the use of renewable and sustainable materials were highly valued by the ***,statistical analyses confirmed the significance of these ***,some strategies received comparatively lower ratings,suggesting the need for further attention and *** findings have important implications for policymakers,industry professionals,and stakeholders,guiding decision-making and resource *** prioritising and implementing the identified strategies,stakeholders can drive the adoption of circular economy principles,enhance resource efficiency,and reduce waste in construction ***,this study lays the foundation for future research,highlighting the importance of exploring barriers to implementation,understanding synergies and trade-offs among strategies,conducting longitudinal studies to assess long-term impact,and broadening the participant pool for a more comprehensive ***,this study contributes to the growing body of knowledge on the circular economy in the construction industry and provides valuable insights for promoting sustainability and circularity within the sector.

关键词： Circular economy Construction industry Strategies Resource efficiency Sustainability

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Development of Computer Software for Evaluating Performance Index of Fairly Used Vehicle Engines

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材料科学与工程（中英文A版） 2014年第7期4卷 249-254页

作者： Morufu Oyekola Oduola Kayode Oke Kunle Joseph Akinluwade Adelana Rasaki Adetunji Department of Engineering Prototype Engineering Development Institute llesa Nigeria Department of Mechanical Engineering Federal University of Technology Akure (FUTA) Akure Nigeria

The introduction of Structural Adjustment Programme (SAP) in 1984 to tackle economic challenges marked the entry of used vehicles which are imported mainly from Europe and America into the road transportation system of Nigeria. However, many problems, ranging from pollution and degradation of environment to personal inconveniencies to owners/users of these used vehicles due to frequent breakdown, have been identified with these vehicles. Sequel to this, software was designed with graphical user interface (GUI) for evaluating performance index of cars being imported into the country as a way of solving the problems earlier identified. The software was validated using data obtained from 1990 Nissan Primera vehicle model. The result from the validation gave the performance index value of 8.8019 × 10-29 for the vehicle used. This implies that the reliability of this vehicle model is almost nil after twenty years of usage.

关键词：计算机软件性能指标二手车评价发动机图形用户界面道路运输系统 TIFF格式

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Practical Approach Design Piezoresistive Pressure Sensor in Circular Diaphragm

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材料科学与工程（中英文B版） 2019年第3期9卷 85-91页

作者： Renan Gabbi Luiz Antonio Rasia Daniel Curvello de Mendonca Müller Jorge Ramírez Beltrán Jose Antonio Gonzalez da Silva Manuel Martin Perez Reimbold federal Institute of Education Science and Technology FarroupilhaCampus PanambiPanambi 98280-000Brazil Department of Exact sciences and Engineering Regional University of the Northwest of the State of Rio Grande do SulPanambi 98280-000Brazil University Veterinary Hospital Federal University of Santa MariaSanta Maria 97105-900Brazil Technological University of Habana JoséAntonio Echeverría Havana 62644Cuba

This paper presents a methodology for analytical calculation and computational simulation using the finite element method for piezoresistive graphite sensor element on flexible polymer substrate,A4 *** computer simulation aims to find the region of greatest mechanical tension and deflection of the circular diaphragm set in the circumference *** steps for simulation are geometry definition,mesh generation,inclusion of material physical properties and simulation *** mathematical modeling of maximum mechanical stress and deflection is described analytically and *** analytical calculations were compared with the computer simulation and presented a relative percentage error of 3.38%for the maximum *** results show that the piezoresistor should be positioned at the edges of the circular diaphragm to take advantage of maximum mechanical stress by defining the best location for graphite film deposition for sensor device designs and fabrications.

关键词： Piezoresistivity sensor element finite elements and mathematical modeling

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SH INTERFACE WAVES IN PRESTRESSED PIEZOELECTRIC LAYERED STRUCTURE

SH INTERFACE WAVES IN PRESTRESSED PIEZOELECTRIC LAYERED STRU...

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2016年全国压电和声波理论及器件应用研讨会

作者： Kai MIAO Jian-jun LIU Xiao-shan CAO Department of Engineering Mechanics School of Civil Engineering and ArchitectureXi'an University of Technology State Key Laboratory of Transducer technology Chinese Academy of Sciences

Background, Motivation and Objective With the development of the surface acoustic wave(SAW), nondestructive evaluation using different ultrasonic waves in modern industries and medical fields has been paid more and more attention by many researchers. At present, many studies focused on the Rayleigh wave propagation behavior in different piezoelectric structures with subsurface damage. In addition, many researchers investigated the propagation behavior of the horizontal shear(SH) wave in different structures, including functionally graded piezoelectric materials plate, infinite/semi-infinite piezoelectric/piezomagnetic structure and other layered structures. To provide a useful technique to detecting the subsurface damage in the structure, we propose a layered structure composed of piezoelectric covered layer and an elastic layer with surface damage and study the SH interface waves in the structure. The structure is prestressed so that the displacement and the stress in the interface are continuous. The propagation behavior of SH wave in layered structure with subsurface damage is analyzed in this paper. Statement of Contribution/Methods In the theoretical research, we investigate the propagation of SH interface wave in a layered structure. The upper layer is the homogenous piezoelectric material, the substrate is homogenous elastic half space, and a functionally graded elastic damage layer is in between the upper layer and the substrate. We establish the governing equations with respect to the prestress, the displacement and the electrical potential based on constitutive equations. We also can obtain the relation between the mechanical displacement and the strain components, the relation between the electric field intensity and the electric potential the equations of motion. Through the description of the problem, we could get some mechanical and electrical boundary conditions. Furthermore, an analytical dispersion equation of SH wave for the case of boundary condit

关键词： Piezoelectric layered structure SH interface wave Subsurface damage Dispersion equation

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A Multi-Parametric Platform and Data Fusion for Noninvasive Monitoring of Vital Parameters and Diagnostic of Cardiovascular Diseases

A Multi-Parametric Platform and Data Fusion for Noninvasive ...

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International Conference on Intelligent Computational Systems(ICICS’2012);International Conference on Mechanical,Automotive and materials Engineering(ICMAME’2012);International Conference on Electronics,Biomedical Engineering and its Applications(ICEBEA’2012);International Conference on Ecological,Environmental and Biological sciences(ICEEBS’2012);International Conference on Business,Economics,Management and Behavioral sciences (ICBEMBS’2012);International Conference on Applied Mathematics and Pharmaceutical sciences(ICAMPS’2012)

作者： Omar Abdallah Armin Bolz the Institute of Biomedical Engineering Karlsruhe Institute of Technology KIT

Cardiovascular diseases （CVDs） are the leading causes of mortality and morbidity in the world. Although a large proportion of CVDs is preventable, they continue to rise mainly because preventive measures are inadequate and the people do little for that aim. Valuable quality service denotes the accurate diagnosis of patients and providing efficient treatment. Poor clinical decisions may lead to disasters and hence are seldom entertained. Besides, it is essential that the hospitals decrease the cost of clinical test. Appropriate computer-based information and/or decision support systems can aid in achieving clinical tests at a reduced cost. We describe in this paper an innovative multi- sensor system platform that enables the monitoring of vital parameters and allows the diagnostic of cardiovascular diseases non-invasively in an easy manner. Fuzzy logic and Neuronal Network can be applied by data fusion for the detection of further parameters from the different signals of the sensors and permits a decision making by the diagnosis of CVDs.

关键词： cardiovascular diseases prevention data fusion multisensor diagnostic vital parameter monitoring

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Controllable Height of Regular Copper Array Using Electrochemical Plating

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材料科学与工程（中英文A版） 2015年第5期5卷 233-237页

作者： Ya-Wen Su National Nano Device laboratories Hsinchu Taiwan

A novel bottom-up electrochemical plating technology is proposed and demonstrated. This reproducible plating technology possesses several advantages for fabricating regular copper arrays. The process eliminates surface voids and defects. Copper lines with 40 nm in width and copper pillar with 60 nm in diameter are formed by electrochemical copper plating combined with e-beam patterning. High quality crystalline copper lines and pillars were produced by making use of low electrolyte concentrations. Further, the height of structures was precisely monitored in situ by calculating the amount of charge needed for electroplating. This bottom-up plating approach meant that the over-fill problem commonly associated with electroplating could be avoided. The result was regular copper nanostructures. This technology could be applied in the manufacture of various nano-scale structures using different metals.

关键词：化学镀技术化学镀铜阵列纳米结构控制用电电镀技术自底向上

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Nanorobotics in Drug Delivery Systems for Treatment of Cancer： A Review

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材料科学与工程（中英文A版） 2016年第3期6卷 167-180页

作者： Glecia Virgolino da Silva LUZ Post-Graduate Program in Biomedical Engineering Campus Gama-FGA University of Brasilia-UnB Brasilia 72444-240 Brazil Pharmaceutical technology and Quality Control of Medicines University Center of Distrito Federal-UDF Brasilia 70390-045Brazil University of Brasilia-UnB/ UnB at Gama-FGA Brasilia 72444-240 Brazil Post-Graduate Program in Health sciences Campus Darcy Ribeiro University of Brasilia-UnB Brasilia 70910-900 Brazil Nanotechnology Laboratory- University of Brasilia at Gama (NANOTEC-FGA/UnB) Brasilia 72444-240 Brazil

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Proficiency Testing in Analysis of Wine Products

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Journal of Chemistry and Chemical Engineering 2013年第8期7卷 774-778页

作者： Jarmila Lastincova Eubica Pospisilova Ernest Beinrohr Central Controlling and Testing Institute in Agriculture Bratislava 83316 Slovakia Faculty of Agronomy Mendel University in Brno Brno 61300 Czech Republic Faculty of Chemical and Food technology Slovak University of Technology Bratislava 81237 Slovakia

The quality variety wines which are produced in specified regions of Slovakia are mostly watched category of wine in European Union. Quality of the measurement for appropriate parameter in wine sample is given by uncertainty. Therefore, protocol of analysis has to have an uncertainty of measurement and should be made in accredited laboratory. In Slovakia, there are six wine growing regions （Tokaj, east Slovakia region, south Slovakia region, middle Slovakia region, Nitriansky region and Little-Carpathian region） where the quality wines with protected designation of origin are produced. Central Controlling and Testing Institute in Agriculture in Bratislava is a state organization, which has an accredited laboratory for testing wine products before introduction into the market. This article presents the results of the authors＇ measurements in proficiency testing FAPAS （food analysis performance assessment scheme） which were organized by Central science Laboratory in York （England） in 2011. The authors add also interlaboratory comparison in 2012 between Slovak accredited laboratories. The results show very good agreement. Quality control in the wine sector presents very important feature in the market, therefore, using certified reference materials and checking the accredited laboratories with interlaboratory comparisons is very helpful. Testing of wine in the authors＇ laboratory is performed by EN ISO/IEC： 17025. The results show that z-score lies not outside the range ±2 and this is a chance that the authors＇ results are actually acceptable.

关键词： Wine analysis comparison proficiency tests.

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