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Ballistic design and testing of a composite armour reinforced by CNTs suitable for armoured vehicles

Defence Technology（防务技术） 2024年第2期32卷 173-195页

作者： Evangelos Ch.Tsirogiannis Evangelos Daskalakis mohamed H.Hassan abdalla m.Omar Paulo Bartolo EODH SA Research and Development DepartmentLakkoma Chalkidikis63080Greece School of mechanical Aerospace and Civil EngineeringUniversity of ManchesterManchesterM139PLUK Singapore Centre for 3D Printing School of Mechanical and Aerospace EngineeringNanyang Technological University639798Singapore

This paper is investigating the use of composite armour reinforced by nanomaterials, for the protection of light armoured(LAV) and medium armoured military vehicles(mAV), and the interaction between the composite materials and high-performance ballistic projectiles. Four armour materials, consisted of front hybrid fibre reinforced polymer cover layer, ceramic strike-face, fibre reinforced polymer intermediate layer and the metal matrix composite reinforced backplate, were manufactured and assembled by adhesive technology. The proposed laminated protection system is suitable for armoured ground vehicles;however, it could be used as armour on ground, air and naval platforms. The design of the protection system, including material selection and thickness, was elaborated depending on the performance requirements of Level 4 + STANAG 4569 military standard(projectile 14.5 mm × 114 mm API B32) and especially on a design philosophy which is analysed with the specifications. The backplate of this new composite is a hybrid material of metal matrix Composite(mmC) reinforced with carbon nanotubes(CNTs), manufactured with the use of powder metallurgy technique. The composite backplate material was morphologically, mechanically and chemically analysed. Results show that all plates are presenting high mechanical properties and ballistic characteristics, compared to commonly used armour plates. Real military ballistic tests according to AEP-STANAG 4569 were carried out for the total composite armour systems. After the ballistic tests, AA2024-CNT3 showed the best protection results, compared with the other plates(AA2024-CNT1 and AA2024-CNT2), with the projectile being unable to fully penetrate the composite plate.

关键词： Passive armour protection Protective armour Ballistic performance Hybrid composites Vehicle protection

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A minimizing Property of Homographic Solutions

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Acta mathematica Sinica,English Series 2014年第2期30卷 353-360页

作者： abdalla m.mANSUR Daniel C.OFFIN Department of mathematics and Statistics Queen’s University

In this paper, we prove that the homographic solutions to the rhombus four body prob- lem are the variational minimizers of the Lagrangian action restricted on a holonomically constrained rhombus loop space.

关键词： Nbody problems holonomic systems action functional

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Spontaneous ejaculation after spinal cord trauma

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Asian Journal of Andrology 2010年第4期12卷 609-610页

作者： Hossam A. Yasien abdalla m. Attia Department of Dermatology Andrology ＆ STDs Faculty of Medicine Menoufiya University Menoufiya 32511 Egypt

I am Dr Hossam A. Yasien, from the Department of Dermatology, Andrology ＆ STDs, Faculty of medicine, menoufiya University, menoufiya, Egypt. Spinal cord lesions in humans are associated with impaired ejaculation [1], suggesting that the effects of descending pathways on the spinal ejaculatory mechanism are predominantly excitatory. In rodents, however, there may be an additional and important descending inhibitory pathway [2]. We report a case of a patient in whom a spinal trauma was unusually associated with spontaneous ejaculation.

关键词： ejaculation spinal trauma

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Synthesis, Structural Characterization, and Antimicrobial Activities of mn（II）, Co（II）, Ni（II）, Cu（ll） and Zn（II） Complexes of Triazole-based Azodyes

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Chinese Journal of Chemistry 2011年第6期29卷 1124-1132页

作者： Khedr, abdalla m. Gaber, mohamed Abd EI-Zaher, Eman H. Chemistry Department Faculty of Science Tanta University Tanta Egypt Botany Department Faculty of Science Tanta University Tanta Egypt

The synthesis and characterization of new transition metal complexes of mn（ll）, Co（II）, Ni（II）, Cu（II） and Zn（II） with 3-（2-hydroxynaph-l-ylazo）-1,2,4-triazole （HL1） and 3-（2-hydroxy-3-carboxynaph-l-ylazo）-1,2,4-triazole （HL2） have been carried out. Their structures were confirmed by elemental analyses, thermal analyses, spectral and magnetic data. The IR and 1H NmR spectra indicated that HL1 and HL2 coordinated to the metal ions as bidentate monobasic ligands via the hydroxyl O and azo N atoms. The UV-Vis, ESR spectra and magnetic moment data revealed the formation of octahedral complexes [mnL1（AcO）（H2O）3] （1）, [CoL1（AcO）（HzO）3]·H2O （2）, [mnL2- （AcO）（H20）3] （6） and [CoL2（AcO）（H2O）3] （7）, [NiL1（AcO）（H2O）] （3）,[ZnLI（AcO）（HzO）]·H2O （5）, [NiL2- （AcO）（H2O）] （8）, [ZnL2（AcO）（H2O）]·H2O （10） have tetrahedral geometry, whereas [CuLI（AcO）（H2O）2] （4） and [CuL2（AcO）（H2O）2]·5H2O （9） have square pyramidal geometry.. The mass spectra of the complexes under EI-con- ditions showed the highest peaks corresponding to their molecular weights, based on the atomic weights of 55mn, 59Co, 58Ni, 63Cu and 64Zn isotopes; besides, other peaks containing other isotopes distribution of the metal. Kinetic and thermodynamic parameters of the thermal decomposition stages were computed from the thermal data using Coats-Redfern method. HL2 and complexes 6--10 were found to have moderate antimicrobial activities against Staphylococcus＇ aureus （gram positive）, Escherichia coli （gram negative） and Salmonella sp bacteria, and antifungal activity against Fusarium oxysporum, Aspergillus niger and Candida albicans. Also, in most cases, metallation increased the activity compared with the free ligand.

关键词： analytical and inorganic chemistry triazole azodyes metal(II) chelates antimicrobial activities

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A Fault-Handling method for the Hamiltonian Cycle in the Hypercube Topology

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Computers, materials & Continua 2021年第7期68卷 505-519页

作者： Adnan A.Hnaif Abdelfatah A.Tamimi Ayman m.abdalla Iqbal Jebril Faculty of Science and Information Technology Al-Zaytoonah University of JordanAmman11733Jordan

many routing protocols,such as distance vector and link-state protocols are used for nding the best paths in a *** nd the path between the source and destination nodes where every node is visited once with no repeats,Hamiltonian and Hypercube routing protocols are often ***,these algorithms are not designed to solve the problem of a node failure,where one or more nodes become *** paper proposes an efcient modied Fault-free Hamiltonian Cycle based on the Hypercube Topology(FHCHT)to perform a connection between nodes when one or more nodes become *** can be applied in a different environment to transmit data with a high-reliability connection by nding an alternative path between the source and destination nodes when some nodes ***,a proposed Hamiltonian Near Cycle(HNC)scheme has been developed and *** implementation results indicated that FHCHT produces alternative cycles relatively similar to a Hamiltonian Cycle for the Hypercube,complete,and random *** implementation of the proposed algorithm in a Hypercube achieved a 31%and 76%reduction in cost compared to the complete and random graphs,respectively.

关键词： Hamiltonian cycle hypercube fault tolerance routing protocols WSN IoT

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Unconstrained Hand Dorsal Veins Image Database and Recognition System

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Computers, materials & Continua 2022年第12期73卷 5063-5073页

作者： mustafa m.Al Rifaee mohammad m.abdallah mosa I.Salah Ayman m.abdalla Faculty of Science and Information Technology Al-Zaytoonah University of JordanAmman11733Jordan Faculty of Architecture and Design Al-Zaytoonah University of JordanAmman11733Jordan

Hand veins can be used effectively in biometric recognition since they are internal organs that,in contrast to fingerprints,are robust under external environment effects such as dirt and paper ***,they form a complex rich shape that is unique,even in identical twins,and allows a high degree of ***,most currently employed hand-based biometric systems rely on hand-touch devices to capture images with the desired *** the start of the COVID-19 pandemic,most handbased biometric systems have become undesirable due to their possible impact on the spread of the ***,new contactless hand-based biometric recognition systems and databases are desired to keep up with the rising hygiene *** contribution of this research is the creation of a database for hand dorsal veins images obtained contact-free with a variation in capturing distance and rotation *** database consists of 1548 images collected from 86 participants whose ages ranged from 19 to 84 *** the other research contribution,a novel geometrical feature extraction method has been developed based on the Curvelet *** method is useful for extracting robust rotation invariance features from vein *** database attributes and the veins recognition results are analyzed to demonstrate their efficacy.

关键词： Biometric recognition contactless hand biometrics veins recognition Curvelet transform image segmentation feature extraction

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Automatic Segmentation and Detection System for Varicocele Using Ultrasound Images

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Computers, materials & Continua 2022年第7期72卷 797-814页

作者： Ayman m.abdalla mohammad Abu Awad Omar AlZoubi La’aly A.Al-Samrraie Department of Computer Science Al-Zaytoonah University of JordanAmman11733Jordan Department of Computer Science Jordan University of Science and TechnologyIrbid22110Jordan Department of Water and Environmental Engineering Al-Huson University CollegeAl-Balqa Applied UniversityIrbidJordan

The enlarged veins in the pampiniform venous plexus,known as varicocele disease,are typically identified using ultrasound *** diagnosis of varicocele is based on examinations made in three positions taken to the right and left testicles of the male *** proposed system is designed to determine whether a patient is *** is more frequent on the left side of the scrotum than on the right and physicians commonly depend on the supine position more than other ***,the experimental results of this study focused on images taken in the supine position of the left testicles of *** are two possible vein structures in each image:a cross-section(circular)and a tube(non-circular)*** proposed system identifies dilated(varicocele)veins of these structures in ultrasound images in three stages:preprocessing,processing,and detection and *** three stages are applied in three different color modes:Grayscale,Red-Green-Blue(RGB),and Hue,Saturation,and Value(HSV).In the preprocessing stage,the region of interest enclosing the pampiniform plexus area is extracted using a median filter and threshold ***,the processing stage employs different filters to perform image ***,edge detection is applied in multiple steps and the detected veins are measured to determine if dilated veins *** implementation results showed the proposed system is faster andmore effective than the previous work.

关键词： Varicocele color mode HSV median filter segmentation canny

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Nanothermite colloids: A new prospective for enhanced performance

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Defence Technology（防务技术） 2019年第3期15卷 319-325页

作者： m. Gaber Zaky Ahmed m. abdalla Rakesh P. Sahu Ishwar K. Puri mostafa Radwan Sherif Elbasuney School of Chemical Engineering Military Technical College Kobry Elkoba Cairo Egypt Department of Engineering Physics and Department of mechanical Engineering McMaster University 1280 Main Street West Hamilton Ontario L8S 4L7 Canada Department of mechanical Engineering McMaster University 1280 Main Street West Hamilton Ontario L8S 4L7 Canada British University in Egypt Elshorouk City Cairo Egypt

Nanothermites (metal oxide/metal) can offer tremendously exothermic self sustained reactions. CuO is one of the most effective oxidizers for naonothermite applications. This study reports on two prospectives for the manufacture of CuO nanoparticles. Colloidal CuO particles of 15 nm particle size were developed using hydrothermal synthesis technique. multiwalled carbon nanotubes (mWCNTs) with surface are 700m2/g was employed as a substrate for synthesis of CuO-coated mWCNTs using electroless plating. On the other hand, aluminium particles with combustion heat of 32000 J/g is of interest as high energy density material. The impact of stoichiometric nanothermite particles (CuO/Al & Cuo-coated mWCNTs/Al) on shock wave strength of Al/TNT nanocomposite was evaluated using ballistic mortar test. While CuO-coated mWCNTs decreased the shock wave strength by 15%;colloidal CuO enhanced the shock wave strength by 30%. The superior performance of colloidal CuO particles was correlated to their steric stabilization with employed organic solvent. This is the first time ever to report on fabrication, isolation, and integration of stablilized colloidal nanothermite particles into energetic matrix where intimate mixing between oxidizer and metal fuel could be achieved.

关键词： Hydrothermal synthesis Nanoparticles Carbon nanotubes Nanothermites Energetic materials

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Features on Very Peripheral Collisions of 16O-Em at 3.7A GeV

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Chinese Physics Letters 2018年第3期35卷 14-17页

作者： m.S.El-Nagdy A.Abdelsalam B.m.Badawy P.I.Zarubin A.m.abdalla A.Saber Physics Department Faculty of ScienceHelwan UniversityHelwanEgypt Physics Department Faculty of ScienceCairo UniversityGizaEgypt Reactor Physics Department Atomic Energy AuthorityEgypt Joint Institute for Nuclear Research DubnaMoscowRussia Department of mathematical and Physical Engineering Faculty of Engineering in ShoubraBenha UniversityCairoEgypt

From 1540 inelastic interactions of 3. 7A GeV 160 projectile with emulsion nuclei, we select samples of 87 and 61 events carefully due to interactions of neutron （n） and singly charged particles （Z = 1）, respectively. New results concerning the topology of such events are investigated. The average multiplicities of secondary relativistic particles that appear as shower tracks for n and Z = 1 stay more or less constant when compared with analogous data on p-Em at similar energy. The multiplicity distributions and the average values of the various secondary charged particles are studied and compared with the corresponding predictions by the cascade evaporation model. The results assume that the n or Z = 1 from 16O collide peripherally with an emulsion target and are considered as an expansion to the N-N collisions.

关键词： Features on Very Peripheral Collisions of O-Em at 3.7 A GeV

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Achievements and trends of solid oxide fuel cells in clean energy field: a perspective review

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Frontiers in Energy 2020年第2期14卷 359-382页

作者： abdalla m.abdalla Shahzad HOSSAIN Pg mohdIskandr PETRA mostafa GHASEmI Abul K.AZAD Faculty of Integrated Technologies Universiti Brunei DarussalamJalanTungku LinkGadong BE 1410Brunei Darussalam mechanical Engineering Department Faculty of EngineeringSuez Canal UniversityIsmailia 41522Egypt Institute of Nuclear Science and Technology Bangladesh Atomic Energy CommissionGPO Box No 3787Dhaka 1000Bangladesh Petroleum Engineering Department Universiti Teknologi PETRONASSeri Iskandar31750 TronohPerakMalaysia

The main concerns in the world today,especially in the energy field,are subjected to clean,efficient,and durable sources of *** three aspects are the main goals that scientist are paying attention ***,the various types of energy resources include fossil and sustainable ones,but still some challenges are chasing these kinds from energy conversion,storage,and ***,the most reliable and considered energy resource nowadays is the utilized one which is as highly efficient,clean,and everlasting as ***,in this review,an attempt is made to highlight one of the promising types as a clean and efficient energy *** oxide fuel cell(SOFC)is the most efficient type of the fuel cell types involved with hydrogen and hydrocarbon-based fuels,especially when it works with combined heat and power(CHP).The importance of this type is due to its nature of work as conversion tool from chemical to electrical for generation of power without noise,pollution,and can be safely handled.

关键词： solid oxide fuel cells(SOFCs) clean energy design micro-scale nano-scale performance

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