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Chinese Physics B 2020年第11期29卷 391-397页

作者： Md Fazlul Hoque Harun-Or-Roshid Fahad sameer Alshammari Department of Mathematics Pabna University of Science and TechnologyPabna 6600Bangladesh Department of Mathematics College of Science at AlkharjPrince Sattam bin Abdulaziz UniversityAlkharjSaudi Arabia

We present new lemmas,theorem and corollaries to construct interactions among higher-order rogue waves,n-periodic waves and n-solitons solutions(n→∞)to the(2+1)-dimensional asymmetric nizhnik-novikov-Veselov(AnnV)*** examples for theories are given by choosing definite interactions of the wave solutions for the *** particular,we exhibit dynamical interactions between a rogue and a cross bright-dark bell wave,a rogue and a cross-bright bell wave,a rogue and a one-,two-,three-,four-periodic *** addition,we also present multi-types interactions between a rogue and a periodic cross-bright bell wave,a rogue and a periodic cross-bright-bark bell ***,we physically explain such interaction solutions of the model in the 3D and density plots.

关键词： the(2+1)-dimensional asymmetric nizhnik-novikov-Veselov(AnnV)equation higher-order rogue waves n-solitons periodic waves bright-dark bell waves

Performance Evaluation of Calcium Alkali-treated Oil Palm/Pineapple Fibre/Bio-phenolic Composites

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Journal of Bionic Engineering 2022年第5期19卷 1493-1503页

作者： sameer A.Awad Hassan Fouad Eman M.Khalaf n.Saba Hom n.Dhakal M.Jawaid Othman Y.Alothman Department of Chemistry School of Science and TechnologyUniversity of New EnglandArmidaleNSW 2351Australia Department of Chemistry College of Education for Pure ScienceUniversity of Al-AnbarRamadi 31001Iraq Biomedical Engineering Department Faculty of EngineeringHelwan UniversityHelwan 11792Egypt Pharmacy Department Al-Maarif University CollegeAnbar 3001 RamadiIraq Laboratory of Biocomposite Technology Institute of Tropical Forestry and Forest Products(INTROP)Universiti Putra Malaysia43400 SerdangMalaysia Advanced Polymers and Composites(APC)Research Group School of Mechanical and Design EngineeringUniversity of PortsmouthPortsmouth PO13DJUK Department of Chemical Engineering College of EngineeringKing Saud UniversityRiyadh 11433Saudi Arabia

The utilisation of oil palm fibre(OPF)and pineapple leaf fibres(PALF)as reinforcement materials for bio-phenolic composites is growing especially in automotive lightweight *** major aim of this current study is to investigate the influence of alkali(Ca(OH)_(2)) treatment on pure and hybrid *** effects of enhancements in chemical interactions were evaluated by the Fourier-Transform Infrared Spectrometer(FTIR).Dynamic Mechanical Analysis(DMA)and Thermogravimetric Analysis(TGA)performance of untreated reinforcements(OPF and PALF)and treated(OPF/OPF)composites at varying temperature and noted sufficient interfacial bonding contributing towards the improvements in thermal *** DMA results,the storage modulus improved with treated composites while the damping factor was ***,the treated hybrid composites exhibited significant improvements in thermal stability compared to untreated fibre *** results indicated that alkali calcium hydroxide(Ca(OH2(:T)incorporation in hybrid composites(OPF/PALF)results in increased tensile strength and modulus among all ***,the alkali-treated(Ca(OH)_(2))-treated pure composite(T/50%PALF),and hybrid composites(T/1OPF.1PALF)exhibited better flexural strength as compared with other *** contrast,the T/50%PALF showed higher flexural stress of 78.2 MPa,while the flexural modulus was recorded at 6503 *** can be proposed from the findings of this study that the alkali treatment(5%Ca(OH)_(2))can be utilised to improve the strength and efficiency of agriculture biomass to be used as reinforcements in ***,the hybridisation of bio-fibre composites has the potential as a novel variety of biodegradable and sustainable composites appropriate for several industrial and engineering applications.

关键词： Hybrid fibre composites Alkali treatments Surface modifications Mechanical properties Thermal stability

Relativistic symmetries with the trigonometric Pschl-Teller potential plus Coulomb-like tensor interaction

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Chinese Physics B 2013年第6期22卷 181-192页

作者： Babatunde J.Falaye sameer M.Ikhdair Theoretical Physics Section Department of PhysicsUniversity of IlorinP.M.B.1515IlorinNigeria Physics Department Near East University922022 NicosiaNorthern CyprusTurkey Physics Department Faculty of ScienceAn-Najah National UniversityNablusWest BankPalestine

The Dirac equation is solved to obtain its approximate bound states for a spin-1/2 particle in the presence of trigonometric Poeschl-Teller （tPT） potential including a Coulomb-like tensor interaction with arbitrary spin-orbit quantum number κ using an approximation scheme to substitute the centrifugal terms κ（κ± i 1）r^-2. In view of spin and pseudo-spin （p-spin） symmetries, the relativistic energy eigenvalues and the corresponding two-component wave functions of a particle moving in the field of attractive and repulsive tPT potentials are obtained using the asymptotic iteration method （AIM）. We present numerical results in the absence and presence of tensor coupling A and for various values of spin and p-spin constants and quantum numbers n and κ. The non-relativistic limit is also obtained.

关键词： Dirac equation trigonometric Poeschl-Teller potential tensor interaction approximation schemes,asymptotic iteration method

Microstructure,mechanical response and fractography of AZ91E/Al_(2)O_(3)_(p) nano composite fabricated by semi solid stir casting method

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Journal of Magnesium and Alloys 2017年第1期5卷 48-55页

作者： sameer Kumar D Suman K.n.S Tara Sasanka C Ravindra K Palash Poddar Department of Mechanical Engineering R.V.R.&J.C.College of EngineeringGunturIndia Department of Mechanical Engineering Andhra University College of EngineeringVisakhapatnamIndia CSIR-national Metallurgical Laboratory JamshedpurIndia d Department of Mechanical EngineeringNarasaraopeta Engineering CollegeNarasaraopetIndia

The present study confers to the fabrication and its characterization of magnesium alloy(AZ91E)based nano composites with nano Al_(2)O_(3) particulate reinforcements.A novel Semi Solid stir casting technique was adopted for the fabrication of the *** average particle size of 50 nm was used as reinforcement to disperse in *** effects of change in weight fraction of reinforcements on the distribution of particles,particle–matrix interfacial reactions,physical as well as mechanical properties were *** SEM and EDS analysis has shown the uniform distribution of particles in the composite along with the presence of *** mechanical properties of reinforced and unreinforced composite were evaluated and *** of tensile specimens was also discussed.

关键词： Magnesium alloys nano composites Semi solid stir casting Al_(2)O_(3)particle

Two-Phase Flow Modeling in a Single Closed Loop Pulsating Heat Pipes

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Journal of Donghua University(English Edition) 2007年第4期24卷 439-444页

作者：杨洪海 sameer Khandekar Sanka V. V.S. n.S. Manyam Manfred Groll College of Environmental Science and Engineering Donghua University Institute of nuclear Technology and Energy System University of Stuttgart70569 StuttgartGermany

Mathematical modeling of pulsating heat pipes through ‘first’ principles is a contemporary problem which remains quite elusive. Simplifications and assumptions made in all the modeling approaches developed so far render them unsuitable for engineering design. In this paper, a more realistic modeling scheme is presented which provides considerable try for thought toward the next progressive step. At high enough heat flux level, closed loop pulsating heat pipes experience a bulk internal unidirectional fluid circulation. Under such a condition, conventional two-phase flow modeling in capillary tubes may be applied. This has been attempted for single-loop PHPs. A homogeneous model and a separated two-fluid flow model based on simultaneous conservation of mass, momentum and energy, have been developed for an equivalent ‘open flow’ system. The model allows prediction of two-phase flow parameters in each sub-section of the device thereby providing important insights into its operation. The concept of ‘void fraction constraint’ in pulsating heat pipe operation is introduced and its relevance to future modeling attempts is outlined.

关键词： Closed loop pulsating heat pipe flow modeling parametric influences

Low-cost and cleanroom-free fabrication of microneedles

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Microsystems & nanoengineering 2018年第1期4卷 518-524页

作者： Hojatollah Rezaei nejad Aydin Sadeqi Gita Kiaee sameer Sonkusale Department of Electrical and Computer Engineering Nano LabTufts UniversityMedfordMA 02155USA Department of Biomedical Engineering Tufts UniversityMedfordMA 02155USA

We present a facile,low-cost and cleanroom-free technique for the fabrication of microneedles using molds created by laser *** mold with high aspect ratios is achieved on acrylic sheet by engraving a specific pattern of crossover lines(COL)using CO2 laser *** COL pattern on the acrylic sheet creates a sharp conical shape in the center of the *** have shown that a variety of microneedle shapes with different heights and tip angles can be easily achieved by changing the number and the length of the ***(PDMS)microneedles were fabricated by casting the PDMS on the *** resulted PDMS microneedles are oxygen plasma treated and then *** PDMS layer is casted on PDMS microneedles and detached after *** silanization prevents those two layers of PDMS from bonding to each other and makes them easily *** detachment of the PDMS mold of microneedles,the mold is used to fabricate degradable polyvinyl alcohol microneedle patch suitable for transdermal drug *** release kinetics of the needles are also shown and discussed in order to prove the applicability of the needles.

关键词： drug delivery laser ablation microneedles

A Spatial-Temporal network Perspective for the Propagation Dynamics of Air Traffic Delays

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Engineering 2021年第4期7卷 452-464页

作者： Qing Cai sameer Alam Vu n.Duong School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore

Intractable delays occur in air traffic due to the imbalance between ever-increasing air traffic demand and limited airspace *** air traffic is associated with complex air transport systems,delays can be magnified and propagated throughout these systems,resulting in the emergent behavior known as delay *** understanding of delay propagation dynamics is pertinent to modern air traffic *** this work,we present a complex network perspective of delay propagation ***,we model air traffic scenarios using spatial–temporal networks with airports as the *** establish the dynamic edges between the nodes,we develop a delay propagation method and apply it to a given set of air traffic *** on the constructed spatial-temporal networks,we suggest three metrics-magnitude,severity,and speed-to gauge delay propagation *** validate the effectiveness of the proposed method,we carry out case studies on domestic flights in the Southeastern Asia region(SAR)and the United *** demonstrate that the propagation magnitude in terms of the number of flights affected by delay propagation and the amount of propagated delays for the US traffic are respectively five and ten times those of the *** further reveal that the propagation speed for US traffic is eight times faster than that of the *** delay propagation dynamics reveal that about six hub airports in the SAR have significant propagated delays,while the situation in the United States is considerably worse,with a corresponding number of around *** work provides a potent tool for tracing the evolution of air traffic delays.

关键词： Air traffic Transport systems Delay propagation dynamics Spatial–temporal networks

Tuberculous retropharyngeal abscess without cervical spine TB

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Asian Pacific Journal of Tropical Medicine 2011年第3期4卷 251-252页

作者： Chandrakant Patil Rashmi Kharat(Patil) Prasad Deshmukh sameer Singhal Blenda D'Souza Department of E.n.T J.N.M.C SawangiWardhaMaharashtraIndia Department of Pulmonary Medicine Acharya Vinoba Bhave Rural HospitalSawangi(M)WardhaMaharashtra-442004India

Tuberculous retropharyngeal abscess is a rare *** is present in adults usually due to involvement of cervical spine by *** space usually gets involved in children due to pyogenic organisms or secondary to *** is a case of tuberculous retropharyngeal abscess in an adult female,with pulmonary *** patient was not having tuberculous involvement of cervical spine and was managed surgically by aspirating the retropharyngeal abscess transorally and AKT Category I.

关键词： Tuberculous Retropharyngeal abscess Aspiration

Bound States of the Klein-Gordon for Exponential-Type Potentials in D-Dimensions

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Journal of Quantum Information Science 2011年第2期1卷 73-86页

作者： sameer M. Ikhdair 不详

The approximate analytic bound state solutions of the Klein-Gordon equation with equal scalar and vector exponential-type potentials including the centrifugal potential term are obtained for any arbitrary orbital quantum number l and dimensional space D. The relativistic/non-relativistic energy spectrum formula and the corresponding un-normalized radial wave functions, expressed in terms of the Jacobi polynomials and or the generalized hypergeometric functions have been obtained. A short-cut of the nikiforov-Uvarov (nU) method is used in the solution. A unified treatment of the Eckart, Rosen-Morse, Hulthén and Woods-Saxon potential models can be easily derived from our general solution. The present calculations are found to be identical with those ones appearing in the literature. Further, based on the PT-symmetry, the bound state solutions of the trigonometric Rosen-Morse potential can be easily obtained.

关键词： Approximation Scheme Eckart-Type Potentials Rosen-Morse-Type Potentials Trigonometric Rosen-Morse Potential Hulthén Potential and Woods-Saxon Potential Klein-Gordon Equation nU Method

Occurrence and characterization of toxigenic Bacillus cereus in food and infant feces

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Asian Pacific Journal of Tropical Biomedicine 2015年第7期5卷 510-514页

作者： sameer Rushdi Organji Hussein Hasan Abulreesh Khaled Elbanna Gamal Ebrahim Haridy Osman Manal Khider Department of Biology Faculty of Applied Science Umm Al-Qura University Department of Agricultural Microbiology Faculty of Agriculture Fayoum University Agricultural Genetic Engineering Research Institute (AGER)-ARC GizaEgypt Department of Dairy Science Faculty of Agriculture Fayoum University

Objective: To investigate the true incidence of Bacillus cereus(B. cereus) in food and children diarrhea cases. Methods: A total of 110 samples of various dairy products such as raw milk, long life pasteurized milk, yoghurt and infant powdered milk formulas, raw rice, and feces were examined for the presence of B. cereus by selective plating on mannitol-egg-yolk-polymyxin agar. Confirmation of B. cereus was carried out by biochemical tests and PCR. Identification of non-B. cereus isolates was carried out by 16 S r DnA sequencing. Antimicrobial susceptibility was done by disk diffusion ***: Overall 35 samples(31.8%, n = 110) yielded Bacillus-like growth. Of which 19 samples(54.28%) were positive for B. cereus. All isolates were positive for enterotoxin production. no psychrotolerant B. cereus strains were detected in all samples. All B. cereus isolates were resistant to penicillin G, but susceptible to vancomycin, erythromycin and clindamycin. Conclusions: The results of this study confirm the importance of including B. cereus in disease control and prevention programs, as well as in routine clinical and food quality control laboratories in both Saudi Arabia and Egypt.

关键词： Bacillus cereus Bacillus licheniformis Diarrhea Enterotoxin Food Infant milk formula