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ESSD: Energy Saving and Securing Data Algorithm for WSNs Security

Computers, materials & Continua 2022年第11期73卷 3969-3981页

作者： manar m.Aldaseen khaled m.matrouk Laiali H.Almazaydeh khaled m.Elleithy Computer Engineering Department Al-Hussein Bin Talal UniversityMa’anJordan Software Engineering Department Al-Hussein Bin Talal UniversityMa’anJordan Computer Science and Engineering Department University of BridgeportCTBridgeportUSA

The Wireless Sensor Networks(WSNs)are characterized by their widespread deployment due to low cost,but the WSNs are vulnerable to various types of *** defend against the attacks,an effective security solution is ***,the limits of these networks’battery-based energy to the sensor are the most critical impediments to selecting cryptographic ***,finding a suitable algorithm that achieves the least energy consumption in data encryption and decryption and providing a highly protected system for data remains the fundamental *** this research,the main objective is to obtain data security during transmission by proposing a robust and low-power encryption algorithm,in addition,to examining security algorithms such as ECC and mD5 based on previous *** this research,the Energy Saving and Securing Data algorithm(ESSD)algorithm is introduced,which provides the message Digest 5(mD5)computation simplicity by modifying the Elliptic Curve Cryptography(ECC)under the primary condition of power *** three algorithms,ECC,mD5,and ESSD,are applied to Low Energy Adaptive Clustering Hierarchy(LEACH)and Threshold-sensitive Energy Efficient Sensor Network Protocol(TEEN)hierarchical routing algorithms which are considered the most widely used in *** results of security methods under the LEACH protocol show that all nodes are dead at 456,496,and 496,respectively,to ECC,mD5,and *** results of security methods under the TEEN protocol show that the test ends at 3743,4815,and 4889,respectively,to ECC,mD5,and *** on these results,the ESSD outperforms better in terms of increased security and less power *** addition,it is advantageous when applied to TEEN protocol.

关键词： Cryptography ECC energy consumption ESSD LEACH mD5 RSA TEEN WSNs

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Influence of Support Conditions on the Hydroelastic Behaviour of Floating Thick Elastic Plate

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Journal of marine Science and Application 2019年第3期18卷 295-313页

作者： k.m.Praveen D.karmakar C.Guedes Soares Department of Applied mechanics and Hydraulics National Institute of Technology KarnatakaSurathkalMangalore 575025India Centre for marine Technology and Ocean Engineering (CENTEC) Instituto Superior TécnicoUniversidade de LisboaAv. Rovisco Pais1049 001 LisbonPortugal

The hydroelastic response of very large floating structures (VLFS) under the action of ocean waves is analysed considering the small amplitude wave theory. The very large floating structure is modelled as a floating thick elastic plate based on Timoshenko- mindlin plate theory, and the analysis for the hydroelastic response is performed considering different edge boundary conditions. The numerical study is performed to analyse the wave reflection and transmission characteristics of the floating plate under the influence of different support conditions using eigenfunction expansion method along with the orthogonal mode-coupling relation in the case of finite water depth. Further, the analysis is extended for shallow water depth, and the continuity of energy and mass flux is applied along the edges of the plate to obtain the solution for the problem. The hydroelastic behaviour in terms of reflection and transmission coefficients, plate deflection, strain, bending moment and shear force of the floating thick elastic plate with support conditions is analysed and compared for finite and shallow water depth. The study reveals an interesting aspect in the analysis of thick floating elastic plate with support condition due to the presence of the rotary inertia and transverse shear deformation. The present study will be helpful for the design and analysis of the VLFS in the case of finite and shallow water depth.

关键词： Timoshenko-mindlin plate theory Very large floating structure Support condition Rotary inertia Transverse shear deformation

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Improvement in the mechanical properties of Al/SiC nanocomposites fabricated by severe plastic deformation and friction stir processing

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International Journal of minerals,metallurgy and materials 2017年第3期24卷 297-308页

作者： m.Sarkari khorrami m.kazeminezhad Y.miyashita A.H.kokabi Department of materials Science and Engineering Sharif University of Technology Department of mechanical Engineering Nagaoka University of Technology

Severely deformed aluminum sheets were processed by friction stir processing(FSP) with Si C nanoparticles under different conditions to improve the mechanical properties of both the stir zone and the heat affected zone(HAZ).In the case of using a simple probe and the same rotational direction(RD) of the FSP tool between passes,at least three FSP passes were required to obtain the appropriate distribution of ***,after three FSP passes,fracture occurred outward from the stir zone during transverse tensile tests;thus,the strength of the specimen was significantly lower than that of the severely deformed base material because of the softening phenomenon in the *** improve the mechanical properties of the HAZ,we investigated the possibility of achieving an appropriate distribution of nanoparticles using fewer FSP *** results indicated that using the threaded probe and changing the RD of the FSP tool between the passes effectively shattered the clusters of nanoparticles and led to an acceptable distribution of Si C nanoparticles after two FSP *** these cases,fracture occurred at the HAZ with higher strength compared to the specimen processed using three FSP passes with the same RD between the passes and with the simple *** fracture behaviors of the processed specimens are discussed in detail.

关键词： friction stir processing plastic deformation aluminum silicon carbide nanocomposites mechanical properties

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COmPOSITION AND RHEOLOGY OF POLYAmIDE-6 OBTAINED BY USING BI-AND TRI-FUNCTIONAL COUPLING AGENTS

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Chinese Journal of Polymer Science 2013年第1期31卷 58-70页

作者： J.J.m. Slot E. van Ruymbeke P.A.m. Steeman materials Science Centre DSM Research Department of mathematics and Computer Science Eindhoven University of Technology

A statistical approach is developed, based on a monte Carlo method, in order to determine the statistical composition of a polyamide-6 sample composed of caprolactam （an AB-type monomer） and of a di-acid （A2 type） or a tri- acid （A3 type） as coupling agents. For this composition, the linear theological behavior of these systems is predicted using a tube-based theory. This allows us to show that while coupling agents of type A2 can be seen as flow improver, the effect of branching agents of type A3, depending on the synthesis recipe and the conversion level, can lead either to an increase or to a decrease of the viscosity. By adding specific amount of these agents, we also show that it is possible to obtain materials with the same zero-shear viscosity but with different shear thinning behavior. Furthermore, the polydispersity of linear samples of the same average number molecular weight, mn, is discussed in function of the amount of A2 monomers they contain. Ranging from 2 to 1.5, this difference in polydispersity is expected to have a significant influence on the processing behavior of such materials.

关键词： Polyamide-6 Random branching Statistical composition Rheology monte Carlo Tube theory.

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Particle Size Distribution and Characterization of High Siliceous and microporous materials

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Journal of materials Science & Technology 2005年第4期21卷 563-570页

作者： S.kDurrani J.Akhtar m.Ahmad m.J.moughal Nuclear materials Division Pakistan Institute of Nuclear Science and Technology P.O. Nilore Islamabad PakistanNuclear Materials Division Pakistan Institute of Nuclear Science and Technology P.O. Nilore Islamabad PakistanNuclear Physics Divisions Pakistan Institute of Nuclear Science and Technology P.O. Nilore Islamaad PakistanNuclear Materials Division Pakistan Institute of Nuclear Science and Technology P.O. Nilore. Islamabad. Pakistan

Particle size, textural and surface characteristics influence some major technological properties of high siliceous aluminosilicate zeolite and sillicoaluminophosphate （SAPO） microporous materials. A comparative study was furnished for measuring surface characteristics, particle size and particle size distribution using particle size analyzer （PSA） and scanning electron microscope （SEm）. The PSA is capable of measuring particle diameter in micron range. The results of these techniques for estimation of particle size were compared and correlated statistically. Student t-test and variance ratio test （F-test） methods were performed for the significance of results by the analysis of variance （ANONA） and multiple-range tests. Textural and surface characteristics were evaluated by Brunauer, Emmett ＆ Teller （BET） volumetric technique and v-αs plotting method. The textural results shows that the external surface area and micropore volume of microporous materials were higher than those of the high siliceous zeolites and its zeotype materials.

关键词： Synthesis High siliceous zeolites microporous materials Particle size distribution micropore volume SEm

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Effect of Hydrogen Charging on the Tensile and Constant Load Properties of an Austenitic Stainless Steel Weldment

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Journal of materials Science & Technology 2001年第4期17卷 444-448页

作者： A.m.Nasreldin, m.m.A.Gad, I.T.Hassan, m.m.Ghoneim and A.A.El-sayed metallurgy Dept., Nuclear Research Centre, Atomic Energy Authority P.O.13759, Cairo, Egypt metall. Dept. Nucl. Res. Cent. Atomic Energy Authority P.O. 13759 Cairo Egypt

The effect of cathodic hydrogen charging on the tensile and constant load properties was deter- mined for an austenitic stainless steel weldment comprising a 304L steel in the solution treated condition as a base metal and a 308L filler steel as a weld metal. Part of the 304L solution treated steel was separately given additional sensitization treatment to simulate the microstructure that would develop in the heat affected zone. Tests were performed at room temperature on notched round bar specimens. Hydrogen charging resulted in a pronounced embrittlement of the tested materials. This was manifested mainly as a considerable loss in the ductility of tensile specimens and a decrease in the time to failure and threshold stress of constant load specimens. The 308L weld metal exhibited the highest, and the 304L solution treated steel the lowest, resistance to hydrogen embrittlement. Hydrogen embrittlement was associated with the formation of strain induced martensite as well as a transition from brittle to ductile fracture morphology onwards the centre of the specimens.

关键词： Effect of Hydrogen Charging on the Tensile and Constant Load Properties of an Austenitic Stainless Steel Weldment 308

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Ecosystem services assessment using a valuation framework for the Bangladesh Sundarbans: livelihood contribution and degradation analysis

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Journal of Forestry Research 2017年第1期28卷 1-13页

作者： m.m.Abdullah-Al-mamun kazi mohammad masum A.H.m.Raihan Sarker Asyraf mansor Institute of Forestry and Environmental Sciences Chittagong University Department of Forestry and Environmental Science Shahjalal University of Science and Technology School of Biological Sciences Universiti Sains Malaysia

The ecosystem services provided by the Bangladesh Sundarbans contribute in various sectors especially to the livelihood of the surrounding peoples, but they are often overlooked in the valuation process. This study investigates the significance of ecosystem services on peoples＇ lives and how these services are affected by climate change and other factors. Here an economic valuation framework was used to list the ecosystem services provided by this mangrove forest. Direct uses included timber, gol- pata （Nypa fruticans）, honey, beeswax, fish, shrimp larvae and tourism. Indirect uses included carbon storage, protection from cyclones and tidal surges, breeding and nursery grounds for the aquatic species, and biodiversity conservation. This work also found that the ecosystem services were diminished by fresh water flow reduction, overharvesting, sea level rise, salinity increase, poaching, and climate change. In the present context and future scenario, sea level rise will be an important contributor to changes in ecosystem services. But because many factors impact sea level rise, the impact of climate change takes on less importance than many other causes of ecosystem service degradation in the Bangladesh Sundarbans.

关键词： Climate change Bangladesh Sundarbans Ecosystem service Life and livelihood - mangrove

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Effect of Ablation Casting on microstructure and Casting Properties of A356 Aluminium Casting Alloy

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Acta metallurgica Sinica(English Letters) 2013年第1期26卷 85-91页

作者： V. Bohlooli m. Shabani mahalli S. m. A. Boutorabi Casting Research Center School of Metallurgy and Materials Engineering Iran University of Science and Technology (IUST) Center of Excellence for High Strength Alloys Technology (CEHSAT) School of Metallurgy and Materials Engineering Iran University of Science and Technology (IUST)

Recently the Ablation Casting Technology was invented as a new casting process to improve foundry products quality. In this study, the effects of processing variables on the porosity content, rnicrostructure and feedability of A356 casting alloy were investigated. Secondary dendrite arm spacing （SDAS） and eutectic silicon mor-phologies were studied to evaluate the influence of Ablation Casting on the rnicrostructure. Casting density was measured in order to identify porosity content and feedability of ablated and non-ablated specimens. In addition, solidification behavior of the samples was investigated by using thermal analysis technique. The cooling curves and the first derivative curves were plotted and compared with each other. Results showed the ablation process could increase solidification rate significantly. In addition, the microstructural evidences revealed that Ablation Casting process results in more fine and homogeneous structure compared to the non-ablated casting. The feedability improved, SDAS reduced to 35% and porosity content decreased to 3.84 vol.% by implementing this process. It concluded the Ablation Casting is an effective process to gain higher quality in aluminum foundry.

关键词： Ablation Casting A356 aluminium alloy microstructure Porosity Cooling curve

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Overview of SPH-ALE applications for hydraulic turbines in ANDRITZ Hydro

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Journal of Hydrodynamics 2018年第1期30卷 114-121页

作者： m.Rentschler J.C.marongiu m.Neuhauser E.Parkinson R&D Department ANDRITZ Hydro

Over the past 13 years, ANDRITZ Hydro has developed an in-house tool based on the SPH-ALE method for applications in flow simulations in hydraulic turbines. The initial motivation is related to the challenging simulation of free surface flows in Pelton turbines, where highly dynamic water jets interact with rotating buckets, creating thin water jets traveling inside the housing and possibly causing disturbances on the runner. The present paper proposes an overview of industrial applications allowed by the developed tool, including design evaluation of Pelton runners and casings, transient operation of Pelton units and free surface flows in hydraulic structures.

关键词： Pelton turbine two-phase folw smoothed particle hydrodynamics(SPH) arbitrary Lagrange-Euler(ALE)

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Polyurethane Composites Synthesized Using Natural Oil-Based Polyols and Sisal Fibe

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Journal of Renewable materials 2018年第4期6卷 426-437页

作者： S.michalowski m.A.mosiewicki m.kuran´ska m.I.Aranguren A.Prociak Department of Chemistry and Technology of Polymers Faculty of Chemical Engineering and TechnologyCracow University of TechnologyWarszawska 2431-155CracowPoland Instituto de Investigaciones en Ciencia y Tecnología de materiales-Universidad Nacional de mar del Plata Consejo Nacional de Investigaciones Científicas y TécnicasAv.J.B.Justo 43027600Mar del PlataArgentina

Elastomeric polyurethanes were prepared from a reference polyurethane system modified with biobased polyols synthesized using rapeseed or palm *** reference material was modified by replacement of the commercial polyol by 10%of biopolyols and also by addition of sisal fibers up to 5 wt%.The higher functionality of the biopolyols increased the crosslinking density of the networks and this was reflected by an increase in hardness and a decrease in water *** effect of the sisal fibers mainly improved the mechanical and thermomechanical properties of the system with rapeseed oil because of good dispersion and strong fiber-matrix *** system containing palm oil polyol corresponded to an initial formulation of high viscosity and,consequently,the resulting composites presented lower densities than the theoretically expected *** results are associated with fiber dispersion problems in the initial reactive mixture.

关键词： Biopolyols palm oil rapeseed oil polyurethane composites

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