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High density thermite mixture for shaped charge ordnance disposal

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Defence Technology（防务技术） 2017年第5期13卷 376-379页

作者： tamer Elshenawy Salah Soliman Ahmed Hawass Technical Research Center Cairo Egypt

The effect of thermite mixture based on aluminum and ferric oxides for ammunition neutralization has been studied and tested. Thermochemical calculations have been carried out for different percentage of Al using Chemical Equilibrium Code to expect the highest performance thermite mixture used for shaped charge ordnance disposal. Densities and enthalpy of different formulations have been calculated and demonstrated. The optimized thermite formulation has been prepared experimentally using cold isostatic pressing technique, which exhibited relatively high density and high burning rate thermite mixture. The produced green product compacted powder mixture was tested against small caliber shaped charge bomblet for neutralization. Theoretical and experimental results showed that the prepared thermite mixture containing 33% of aluminum as a fuel with ferric oxide can be successfully used for shaped charge ordnance disposal.

关键词： Chemical Equilibrium Code which exhibited relatively high density

Influence of electric current intensity on the performance of electroformed copper liner for shaped charge application

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Defence Technology（防务技术） 2017年第6期13卷 439-442页

作者： tamer Elshenawy Salah Soliman Ahmed Hawwas Technical Research Center CairoEgypt

Electrolytic Copper used in the shaped charge liner manufacturing can be produced from acid solution using electro-deposition technique. The intensity of the applied electric current controls the quality of the produced copper grade. The electric current intensity within the electrolytic acidic solution cell with the minimum oxygen and sulfur elements in the produced copper was optimized and found to be 30-40 A/Ft^2. The elemental composition of the obtained electrolytic copper was determined using highend stationary vacuum spectrometer, while the oxygen was determined precisely using ELTRA ONH-2000 apparatus. Besides, SEM was used to investigate the shape of the copper texture inside the deposited layers and to determine the average grain size. New relations have been obtained between the applied current intensity and both the oxygen and sulfur contents and the average grain size of the produced copper. Experimental result showed that when the applied current density increases to a certain limit, the oxygen and sulfur content in the electrolytic copper decreases. Performance of the produced copper liner was investigated by the static firing of a small caliber shaped charge containing an electro-formed copper liners, where the penetration depth of the optimized electrolytic liner was enhanced by 22.7% compared to that of baseline non-optimized liner.

关键词： Electrolytic Copper SEM was used to investigate the shape of the copper texture

Which predictors could effect on remission of type 2 diabetes mellitus after the metabolic surgery:A general perspective of current studies?

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World Journal of Diabetes 2021年第8期12卷 1312-1324页

作者： Gamze Akkus tamer Tetiker Department of Internal Medicine Cukurova University Medical FacultyAdana 33170Turkey Department of Endocrinology Cukurova UniversityAdana 33170Turkey

BACKGROUND The alarming rise in the worldwide prevalence of obesity is paralleled by an increasing burden of type 2 diabetes mellitus(T2DM).Metabolic surgery is the most effective means of obtaining substantial and durable weight loss in individual obese patients with *** are randomized trials that justify the inclusion of metabolic surgery into the treatment algorithm for patients with T2DM,but remission rates of T2DM after metabolic surgery can display great *** To discuss the most commonly used surgical options including vertical sleeve gastrectomy,adjustable gastric banding,Roux-en-Y gastric bypass,and biliopancreatic diversion with duodenal *** We also report from observational and randomized controlled studies on rate of remission of T2DM after the surgical *** In light of the recent findings,metabolic surgery is a safe and effective treatment option for obese patient with T2DM,but further studies are needed to clarify better the rate of diabetes *** In light of the recent findings,metabolic surgery is a safe and effective treatment option for obese patients with T2DM,but further studies are needed to clarify better the rate of diabetes remission.

关键词： Metabolic surgery Type 2 diabetes mellitus Vertical sleeve gastrectomy Biliopancreatic diversion

On the Use of Nanofluids in Solar Energy Applications

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Journal of Thermal Science 2020年第3期29卷 513-534页

作者： CUCE Erdem CUCE Pinar Mert GUCLU tamer BESIR Ahmet Burhaneddin Department of Mechanical Engineering Faculty of EngineeringRecep Tayyip Erdogan UniversityZihni Derin Campus53100 RizeTurkey Low/Zero Carbon Energy Technologies Laboratory Faculty of EngineeringRecep Tayyip Erdogan UniversityZihni Derin Campus53100 RizeTurkey Department of Energy Systems Engineering Faculty of EngineeringRecep Tayyip Erdogan UniversityZihni Derin Campus53100 RizeTurkey

Renewable energy technologies are in the centre of interest to narrow the gap between fossil fuels and clean energy *** dominant role of solar energy systems among the alternatives is beyond question owing to being associated with an infinite energy source,well-documented theory,simplicity,eco-friendly structure and notably higher energy and exergy efficiency range compared to other ***,in solar energy systems,conventional working fluids with poor thermophysical properties are still *** other words,further improvements are still available in the said systems by the use of unique nanoparticles with superior thermal,electrical,optical and mechanical *** the scope of this research,the applications of nanofluids in various solar energy systems such as tracking and non-tracking solar collectors,photovoltaic/thermal systems,solar thermoelectric devices,solar stills,solar thermal energy storage systems,solar greenhouses and solar ponds are comprehensively *** comparisons and discussions are proposed for the potential impacts of various nanofluids on coefficient of performance(COP)and thermodynamic performance figures of solar energy systems such as energy and exergy efficiency,effectiveness and *** challenges of nanofluids are also addressed which need to be resolved in further works.

关键词： nanofluids solar energy applications thermal and electrical performance COP cost

The present state of complementary medicine regulation in Saudi Arabia

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Journal of Integrative Medicine 2019年第3期17卷 147-149页

作者： tamer Aboushanab Mohamed Khalil Yaser Al Ahmari National Center for Complementary and Alternative Medicine Ministry of Health

The prevalence of use of traditional and complementary medicine in the Saudi Arabia population has reached 75%. The most used therapies are religious healing, herbal medicine and cupping therapy. The National Center for Complementary and Alternative Medicine is the Saudi national reference for all activities regarding complementary medicine. This article briefly highlights the current state of complementary medicine regulation in Saudi Arabia.

关键词： Complementary medicine Integrative medicine Cupping Acupuncture Saudi Arabia

Stability and Bifurcation Analysis of a Discrete Predator-Prey Model with Mixed Holling Interaction

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Computer Modeling in Engineering & Sciences 2020年第3期122卷 907-921页

作者： M.F.Elettreby tamer Nabil A.Khawagi Mathematics Department Faculty of ScienceKing Khalid UniversityAbha9004Saudi Arabia. Mathematics Department Faculty of ScienceMansoura UniversityMansoura35516Egypt. Basic Science Department Faculty of Computers and InformaticsSuez Canal UniversityIsmailiaEgypt. Mathematics Department Faculty of Science and ArtsKing Khalid UniversityMohayil AsirSaudi Arabia.

In this paper,a discrete Lotka-Volterra predator-prey model is proposed that considers mixed functional responses of Holling types I and *** equilibrium points of the model are obtained,and their stability is *** dynamical behavior of this model is studied according to the change of the control *** find that the complex dynamical behavior extends from a stable state to chaotic ***,the analytical results are clarified by some numerical simulations.

关键词： Predator-prey model functional response of Holling type stability and bifurcation analysis chaos.

Fundamentals of percutaneous coronary bifurcation interventions

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World Journal of Cardiology 2022年第3期14卷 108-138页

作者： tamer Kırat Department of Cardiology Yücelen HospitalMuğla 48000Turkey

Coronary bifurcation lesions(CBLs)account for 15%-20%of all percutaneous coronary *** complex nature of these lesions is responsible for poorer procedural,early and late *** complex lesion subset has received great attention in the interventional cardiac community,and multiple stenting techniques have been *** these,the provisional stenting technique is most often the default strategy;however,the elective double stenting(EDS)technique is preferred in certain subsets of complex *** double kissing crush technique may be the preferred EDS technique because of its efficacy and safety in comparative trials;however,this technique consists of many steps and requires *** new methods have recently been added to the EDS techniques to provide better stent scaffolding and to reduce early and late adverse *** imaging is necessary to determine the interventional strategy and postinterventional *** review discusses the basic concepts,contemporary percutaneous interventional technical approaches,new methods,and controversial treatment issues of CBLs.

关键词： Percutaneous coronary intervention Coronary artery disease Drug-eluting stents Bifurcation lesion Stenting technique Left main intervention

Quantification and spatial distribution of salicylic acid in film tablets using FT-Raman mapping with multivariate curve resolution

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Asian Journal of Pharmaceutical Sciences 2018年第2期13卷 155-162页

作者： Haslet Eksi-Kocak Sibel Ilbasmis tamer Sebnem Yilmaz Merve Eryilmaz Ismail Hakkl Boyaci Ugur tamer Department of Biomedical Engineering Faculty of Engineering Istanbul Aydin University Department of Pharmaceutical Technology Faculty of Pharmacy Gazi University Department of Analytical Chemistry Faculty of Pharmacy Gazi University Food Research Center Hacettepe University

In this study, we proposed a rapid and sensitive method for quantification and spatial distribution of salicylic acid in film tablets using FT-Raman spectroscopy with multivariate curve resolution(MCR). For this purpose, the constituents of film tablets were identified by using FT-Raman spectroscopy, and then eight different concentrations of salicylic acid tablets were visualized by Raman mapping. MCR was applied to mapping data to expose the active pharmaceutical ingredients in the presence of other excipients by monitoring distribution maps and combination of FT-Raman mapping with MCR enabled the determination of lower salicylic acid concentrations. In addition, the distribution of major excipient, lactose, was examined in the tablet form. A calibration curve was obtained by plotting the intensity of the Raman signal at 1635 cm^(-1) versus the concentration of salicylic acid and the correlation was found to be linear within the range of 0.5%–3.9% with a correlation coefficient of 0.99. The limit of detection for the technique was determined 0.35%. The ability of the technique to quantify salicylic acid in tablet test samples was also investigated.

关键词： Raman mapping Multivariate curve resolution FT-Raman spectroscopy Salicylic acid

An approach for measuring spatial similarity among COVID-19 epicenters

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Geo-Spatial Information Science 2023年第3期26卷 496-513页

作者： Neda Kaffash Charandabi Abolghasem Sadeghi-Niaraki Soo-Mi Choi tamer Abuhmed Geomatic Department Marand Technical FacultyUniversity of TabrizTabrizIran Department of Computer Science and Engineering and Convergence Engineering for Intelligent Drone Sejong UniversitySeoulSouth Korea College of Computing and Informatics Sungkyunkwan UniversitySuwonSouth Korea

Most countries and territories worldwide are affected by coronavirus disease 2019(COVID-19),and some cities have become known as epicenters owing to high *** of the changeable and unknown nature of the virus,managers of different cities could learn from the experiences of cities that have been successful in controlling COVID-19 instead of wasting time exploring different *** would be even more beneficial if they analyzed the experiences of similar *** similarity of such cities could be examined within a geographic information system based on various *** study investigated the similarities among eight cities-Wuhan,Tehran,Bergamo,Madrid,Paris,Daegu,New York,and Berlin-in terms of the COVID-19 situation(target)in these locations based on proximity factors,weather,and demographic ***,the factor and target layers were prepared,and then similar cities were identified using a similarity model and different distance *** results were aggregated using the Copeland method because of the different outcomes for each *** most similar city was identified for each selected city,and its similarity level was determined based on these *** results suggested the following pairs of similar cities:Wuhan-Berlin,Tehran-Berlin,Daegu-Wuhan,Bergamo-Madrid,Paris-Madrid,and New York-Paris based on COVID-19 related data up to 15 April 2020(target T1),and Daegu-Wuhan,Tehran-Madrid,Bergamo-Paris,Berlin-Paris,and New York-Madrid up to 8 December 2021(target T2)with a minimum and maximum similarity rate of 82.85%and 92.36%,*** similar cities,the most similar factors among the proximity criteria are the distance from bus and metro stations;among weather,the criteria are humidity and pressure;and among demographics,the criteria are male and female population ratios,literacy ratio,and death ratio from asthma and cancer,with a minimum and maximum difference of 0%and 64.94%,*** addition,according to the rando

关键词： COVID-19 GIS spatial similarity environmental factors demographic factors