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material Selection of a natural Fibre Reinforced Polymer Composites using an Analytical Approach

Journal of Renewable materials 2019年第11期7卷 1165-1179页

作者： m.noryani S.m.Sapuan m.T.mastura m.Y.m.Zuhri E.S.Zainudin Advanced Engineering materials and Composites Research Centre Department of Mechanical and Manufacturing EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Laboratory of Biocomposite Technology Institute of Tropical Forestry and Forest Products(INTROP)Universiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Faculty of mechanical Engineering Universiti Teknikal Malaysia MelakaHang Tuah Jaya76100 Durian TunggalMelakaMalaysia Faculty of mechanical and manufacturing Engineering Technology Universiti Teknikal Malaysia MelakaHang Tuah Jaya76100 Durian TunggalMelakaMalaysia Centre of Advanced Research on Energy Universiti Teknikal Malaysia MelakaHang Tuah Jaya76100 Durian TunggalMelakaMalaysia

material selection has become a critical part of design for engineers,due to availability of diverse choice of materials that have similar properties and meet the product design *** of statistical analysis alone makes it difficult to identify the ideal composition of the final *** integrated approach between statistical model and micromechanical model is *** this paper,resultant natural fibre and polymer matrix from previous study is used to estimate the mechanical properties such as density,Young’s modulus and tensile *** levels of fibre loading are used to compare the optimum natural fibre reinforced polymer composite(nFRPC).The result from this analytical approach revealed that kenaf/polystyrene(PS)with 40%fibre loading is the ideal composite in automotive component *** was found that the ideal composite score is 1.156 g/cm^(3),24.2 GPa and 413.4 mPa for density,Young’s modulus and tensile strength,respectively.A suggestion to increase the properties on Young’s modulus are also *** work proves that the statistical model is well incorporated with the analytical approach to choose the correct composite to use in automotive application.

关键词： material selection natural fibre reinforced polymer composites rule of mixtures

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The Reinforcing Effect of Graphene on the mechanical Properties of Carbon-Epoxy Composites

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Open Journal of Composite materials 2020年第2期10卷 27-44页

作者： Hadimani Shivakumar n. m. Renukappa K. n. Shivakumar B. Suresha Department of Electronics and Communication Engineering Kalpataru Institute of Technology (Visvesvaraya Technological University Belagavi) Tiptur Karnataka India Department of Electronics and Communication Engineering JSS Science and Technology University Mysuru Karnataka India Centers for Composite materials Research North Carolina A & T State University Greensboro NC USA Center for Composite materials Research The National Institute of Engineering Mysuru India

Graphene nanoplatelets (GnPs) are novel nanofillers holding attractive characteristics, including vigorous compatibility with majority polymers, outstanding mechanical, thermal, and electrical properties. In this study, the outstanding GnPs filler was reinforced to the epoxy matrix and carbon fabric/epoxy hybrid composite slabs to enrich their mechanical properties. Graphene nanoplatelets of 0.5, 1, 1.5 and 2 weight percentages were integrated into the epoxy and the physico-mechanical (microstructure, density, tensile, flexural and impact strength) properties were investigated. Furthermore, the mechanical properties of unfilled and 1 wt% GnPs filled carbon fabric/epoxy hybrid composite slabs were investigated. Subsequently, noteworthy improvement in the mechanical properties was conquered for the carbon fabric/epoxy hybrid composites.

关键词： Graphene nanoplatelets Carbon Fabric/Epoxy Hybrid Composite Physico-mechanical Properties Impact Strength

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Anatomical, Histochemical and Cytogenetic Features of <i>Doryopteris triphylla</i>(Pteridaceae)

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American Journal of Plant Sciences 2017年第4期8卷 907-920页

作者： Diego Armando neira Aldo Rubén Andrada Valeria de los ángeles Páez Ana maría Rodriguez norma Fabiana Ríos Olga Gladys martínez marcela Alicia Hernández Herbario Pteridológico Fundación Miguel Lillo Tucumán Argentina Instituto de Genética Fundación Miguel Lillo Tucumán Argentina Inquinoa-Conicet Tucumán Argentina Facultad de Ciencias naturales Universidad Nacional de Salta-IBIGEO Salta Argentina

Doryopteris triphylla (Pteridaceae-Cheilanthoideae) grows in xeric habitats in Brazil, Paraguay, Uruguay and Argentina. The aim of this study was to characterize D. triphylla anatomically, histochemically and cytogenetically. For anatomical characterization, rhizomes, roots, petioles and leaves were made and then stained using Safranine-Astra Blue for further observations. Leaf blades were also cleared. For histochemical analysis, leaf cross sections were stained with different reagents to identify glandular trichomes compounds. For cytogenetic characterization, a karyogram was performed using laboratory cultivated roots. Results show a dictyostelic rhizome covered with scales with apical secreting gland;diarch roots;petiole cross-sections show thick cuticle, uniseriate epidermis, parenchymatic cortex cells with thick walls and a vascular bundle with two xylem groups;and hypostomatic fronds with glandular trichomes. Histochemical studies of secretion products of the glandular trichomes were positive for polysaccharides, pectins, lipids, acid lipids, dihydroxyphenols, phenols and flavonoids. Cytogenetically, D. triphylla is described as a diploid species (2n = 60), with chromosomes gradually decreasing in size. The apical glands in scales of rhizomes, the presence of two xylem groups in the vascular bundle in the petiole and the glandular trichomes on the abaxial surface are new contributions to the species. The type of chemical products secreted by glandular leaf trichomes and karyotype estimation is shown for the first time in this species.

关键词： Anatomy Histochemistry Karyogram Pteridaceae

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运用环保吸附剂墨角藻和响应面法去除Cr(Ⅵ)和皮革染料

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中国皮革 2014年第17期43卷 47-50页

作者： m. Cobas m. A. Sanromán m. Pazos 维哥大学化学工程系西班牙维哥36310

采用墨角藻作为低成本的吸附剂处理制革废水。制革废水呈黄棕色且具有高浓度的Cr(Ⅵ)。因此,使用Cr(Ⅵ)溶液和4种颜料混合,模拟制革废水。基于Box-Behnken设计,采用响应面分析法优化吸附过程。选择初始溶液pH、生物质含量和预处理中CaCl... 详细信息

采用墨角藻作为低成本的吸附剂处理制革废水。制革废水呈黄棕色且具有高浓度的Cr(Ⅵ)。因此,使用Cr(Ⅵ)溶液和4种颜料混合,模拟制革废水。基于Box-Behnken设计,采用响应面分析法优化吸附过程。选择初始溶液pH、生物质含量和预处理中CaCl2溶液浓度为主要参数。统计学分析结果表明:pH值的影响可以忽略不计,生物质含量和CaCl2溶液浓度是主要的影响参数。在最优条件下,98%的Cr(Ⅵ)和88%的染料被除去。相比Temkin,Langmuir和D-R等温模型,Freundlich等温模型能够很好地拟合平衡数据。另外,证实了吸附后的吸附剂可以作为糙皮侧耳菌生产酶的支持基质。

关键词：方差分析生物吸附 Cr(VI) 皮革染料墨角藻

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Teleportation of Entangled States through Divorce of Entangled Pair mediated by a Weak Coherent Field in a High-Q Cavity

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Chinese Physics Letters 2008年第7期25卷 2488-2491页

作者： W. B. Cardoso n. G. de Almeida Instituto de Ffsica Universidade Federal de Goiaes 74.001-970 Goiaenia (GO) Brazil nucleo de Pesquisas em Fisica Universidade Catoelica de Goids 74.605-080 Goiania (GO) Brazil

We propose a scheme to partially teleport an unknown entangled atomic state. A high-Q cavity, supporting one mode of a weak coherent state, is needed to accomplish this process. By partial teleportation we mean that teleportation will occur by changing one of the partners of the entangled state to be teleported. The entangled state to be teleported is composed by one pair of particles, we called this surprising characteristic of maintaining the entanglement, even when one of the particle of the entangled pair being teleported is changed, of divorce of entangled states.

关键词： UnKnOWn ATOmIC STATE DETERmInISTIC QUAnTUm TELEPORTATIOn PODOLSKY-ROSEn CHAnnELS SCHEmE SUPERPOSITIOn OPERATIOnS LIGHT

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Laboratory tests to study the influence of rock stress confinement on the performances of TBm discs in tunnels

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International Journal of minerals,metallurgy and materials 2011年第3期18卷 253-259页

作者： n. Innaurato C. Oggeri P. Oreste R. Vinai DITAG Politecnico di Torino Corso Duca degli Abruzzi 24 Turin Italy

To clarify some aspects of rock destruction with a disc acting on a high confined tunnel face, a series of tests were carried out to examine fracture mechanisms under an indenter that simulates the tunnel boring machine （TBm） tool action, in the presence of an adjacent groove, when a state of stress （lateral confinement） is imposed on a rock sample. These tests proved the importance of carefully establishing the optimal distance of grooves produced by discs acting on a confined surface, and the value （as a mere order of magnitude） of the increase of the thrust to produce the initiation of chip formation, as long as the confinement pressure becomes greater.

关键词： tunnels boring machines rock mechanics stress analysis

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Effect of squeezing on construction and structural safety of the Swiss high-level radioactive waste repository drifts

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JOURnAL OF ROCK mECHAnICS AnD GEOTECHnicaL EnGInEERInG 2024年第12期16卷 5162-5178页

作者： nordas, Alexandros n. natale, matteo Cantieni, Linard Anagnostou, Georgios Swiss Fed Inst Technol Dept Civil Environm & Geomat Engn CH-8093 Zurich Switzerland natl Cooperat Disposal Radioact Waste nagra Dept Construct & Environm CH-5430 Wettingen Switzerland

The deep geological repository for radioactive waste in Switzerland will be embedded in an approximately 100 m thick layer of Opalinus Clay. The emplacement drifts for high-level waste (approximately 3.5 m diameter) are planned to be excavated with a shielded tunnel boring machine (TBm) and supported by a segmental lining. At the repository depth of 900 m in the designated siting region nordlich Lagern, squeezing conditions may be encountered due to the rock strength and the high hydrostatic pressure (90 bar). This paper presents a detailed assessment of the shield jamming and lining overstressing hazards, considering a stiff lining (resistance principle) and a deformable lining (yielding principle), and proposes conceptual design solutions. The assessment is based on three-dimensional transient hydromechanical simulations, which additionally consider the effects of ground anisotropy and the desaturation that may occur under negative pore pressures generated during the drift excavation. By addressing these design issues, the paper takes the opportunity to analyse some more fundamental aspects related to the influences of anisotropy and desaturation on the development of rock convergences and pressures over time, and their markedly different effects on the two lining systems. The results demonstrate that, regardless of these effects, shield jamming can be avoided with a moderate TBm overcut, however overstressing of a stiff lining may be critical depending on whether the ground desaturates. This uncertainty is eliminated using a deformable system with reasonable dimensions of yielding elements, which can also accommodate thermal strains generated due to the high temperature of the disposal canisters. (c) 2024 Institute of Rock and Soil mechanics, Chinese Academy of Sciences. Published by Elsevier B.V. This is an open access article under the CC BY license (http://***/licenses/by/4.0/).

关键词： Radioactive waste disposal Squeezing Opalinus clay Anisotropy Ground desaturation Transient consolidation Tunnel boring machine

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mCRO-PUF:A novel modified Crossover RO-PUF with an Ultra-Expanded CRP Space

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Computers, materials & Continua 2023年第3期74卷 4831-4845页

作者： Hassan Rabiei masoud Kaveh mohammad Reza mosavi Diego martín Department of Electrical Engineering Iran University of Science and TechnologyTehran13114-16846Iran Department of Communication and networking Aalto UniversityEspoo00076Finland ETSI de Telecomunicación Universidad Politécnica de MadridAv.Complutense 30Madrid28040Spain

With the expanding use of the Internet of Things(IoT)devices and the connection of humans and devices to the Internet,the need to provide security in this field is constantly *** conventional cryptographic solutions need the IoT device to store secret keys in its non-volatile memory(nVm)leading the system to be vulnerable to physical *** addition,they are not appropriate for IoT applications due to their complex ***,physically unclonable functions(PUFs)have been introduced to simultaneously address these *** are lightweight and easy-toaccess hardware security primitives which employ the unique characteristics of integrated circuits(ICs)to generate secret *** all proposed PUFs,ring oscillator PUF(RO-PUF)has had amore suitable structure for hardware implementation because of its high reliability and easier providing of circuital ***,RO-PUF has not been so attractive for authentication purposes due to its limited supported challenge-response pairs(CRPs).A few efforts have been made in recent years that could successfully improve the RO-PUF CRP space,such as configurable RO-PUF(CRO-PUF).In this paper,by considerably improving the CRO-PUF structure and adding spare paths,we propose a novel strong RO-PUF structure that exponentially grows the CRP space and dramatically reduces the hardware *** implement our design on a simple and low-cost FPGA chip named XC6SLX9-2tqg144,stating that the proposed design can be used in IoT *** addition,to improve the CRP space,our design creates a suitable improvement in different security/performance terms of the generated responses,and dramatically outperforms the *** average reliability,uniqueness,and uniformity of the responses generated are 99.55%,48.49%,and 50.99%,respectively.

关键词： RO-PUF CRP space configurable design

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Long-term effects of environmentally relevant concentrations of silver nanoparticles on microbial biomass, enzyme activity,and functional genes involved in the nitrogen cycle of loamy soil

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Journal of Environmental Sciences 2018年第7期30卷 12-22页

作者： Anna-Lena Grün Susanne Straskraba Stefanie Schulz michael Schloter Christoph Emmerling Faculty of Regional and Environmental Sciences Department of Soil Science University of Trier J.W.Goethe University Institute of Molecular Biosciences Research for Comparative microbiome Analysis Helmholtz Zentrum München Chair for Soil Science Technische Universit?t München

The increasing production and use of engineered silver nanoparticles（AgnP） in industry and private households are leading to increased concentrations of AgnP in the environment. An ecological risk assessment of AgnP is needed, but it requires understanding the long term effects of environmentally relevant concentrations of AgnP on the soil microbiome. Hence, the aim of this study was to reveal the long-term effects of AgnP on soil microorganisms. The study was conducted as a laboratory incubation experiment over a period of one year using a loamy soil and AgnP concentrations ranging from 0.01 to 1 mg AgnP/kg soil. The short term effects of AgnP were, in general, ***, after one year of exposure to 0.01 mg AgnP/kg, there were significant negative effects on soil microbial biomass（quantified by extractable DnA; p = 0.000） and bacterial ammonia oxidizers（quantified by amo A gene copy numbers; p = 0.009）. Furthermore, the tested AgnP concentrations significantly decreased the soil microbial biomass, the leucine aminopeptidase activity（quantified by substrate turnover; p = 0.014）, and the abundance of nitrogen fixing microorganisms（quantified by nif H gene copy numbers; p = 0.001）. The results of the positive control with Ag nO3 revealed predominantly stronger effects due to Ag＋ion release. Thus, the increasing toxicity of AgnP during the test period may reflect the long-term release of Ag^＋ions. nevertheless, even very low concentrations of AgnP caused disadvantages for the microbial soil community, especially for nitrogen cycling, and our results confirmed the risks of releasing AgnP into the environment.

关键词： Silver nanoparticles Soil microbiome amoA nifH Leucine aminopeptidase activity AgPure

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Reversible Data Hiding in Encrypted Images Based on Adaptive Prediction and Labeling

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Computers, materials & Continua 2022年第11期73卷 3613-3628页

作者： Jiaohua Qin Zhibin He Xuyu Xiang neal n.Xiong College of Computer Science and Information Technology Central South University of Forestry&TechnologyChangsha410004China Department of mathematics and Computer Science Northeastern State UniversityTahlequah74464OKUSA

Recently,reversible data hiding in encrypted images(RDHEI)based on pixel prediction has been a hot ***,existing schemes still employ a pixel predictor that ignores pixel changes in the diagonal direction during prediction,and the pixel labeling scheme is *** solve these problems,this paper proposes reversible data hiding in encrypted images based on adaptive prediction and ***,we design an adaptive gradient prediction(AGP),which uses eight adjacent pixels and combines four scanning methods(i.e.,horizontal,vertical,diagonal,and diagonal)for *** can adaptively adjust the weight of the linear prediction model according to the weight of the edge attribute of the pixel,which improves the prediction ability of the predictor for complex *** the same time,we adopt an adaptive huffman coding labeling scheme,which can adaptively generate huffman codes for labeling according to different images,effectively improving the scheme’s embedding performance on the *** experimental results show that the algorithm has a higher embedding *** embedding rate on the test image Jetplane is 4.2102 bpp,and the average embedding rate on the image dataset Bossbase is 3.8625 bpp.

关键词： Reversible data hiding adaptive gradient prediction huffman coding embedding capacity

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