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Com.utational aerodynam.c analysis on perim.ter reinforced(PR)-com.liant wing

Chinese Journal of Aeronautics 2013年第5期26卷 1093-1105页

作者： N.I.Ism.il A.H.Zulkifli m.Z.abdullah m.Hisyam.Basri Norazharuddin Shah abdullah Faculty of m.chanical engineering Universiti Teknologi MARA40450 Shah AlamSelangorMalaysia School of m.chanical engineering Universiti Sains MalaysiaEngineering Campus14300 Nibong TebalPenangMalaysia School of m.terials and m.neral Resources engineering Universiti Sains MalaysiaEngineering Campus14300 Nibong TebalPenangMalaysia

Abstract Im.lem.nting the m.rphing technique on a m.cro air vehicle （m.V） wing is a very chal- lenging task, due to the m.Ws wing size lim.tation and the com.lex m.rphing m.chanism. As a result, understanding aerodynam.c characteristics and flow configurations, subject to wing structure deform.tion of a m.rphing wing m.V has rem.ined obstructed. Thus, this paper presents the investigation of structural deform.tion, aerodynam.cs perform.nce and flow form.tion on a pro- posed twist m.rphing m.V wing design nam.d perim.ter reinforced （PR）-com.liant wing. The num.rical sim.lation of two-way fluid structure interaction （FSI） investigation consist of a quasi- static aeroelastic structural analysis coupled with 3D incom.ressible Reynolds-averaged Navier- Stokes and shear-stress-transport （RANS-SST） solver utilized throughout this study. Verification of num.rical m.thod on a rigid rectangular wing achieves a good correlation with available exper- im.ntal results. A com.arative aeroelastic study between PR-com.liant to PR and rigid wing per- form.nce is organized to elucidate the m.rphing wing perform.nces. Structural deform.tion results show that PR-com.liant wing is able to alter the wing＇s geom.tric twist characteristic, which has directly influenced both the overall aerodynam.c perform.nce and flow structure behavior. Despite the superior lift perform.nce result, PR-com.liant wing also suffers from.m.ssive drag penalty, which has consequently affected the wing efficiency in general. Based on vortices investigation, the results reveal the connection between these aerodynam.c perform.nces with vortices form.tion on PR-com.liant wing.

关键词： Aerodynam.cs Aeroelasticity Fluid structure interaction m.cro air vehicle (m.V) m.rphing wing

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Assessing the effects of site factors on the productivity of a feller buncher:a tim. and m.tion analysis

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Journal of Forestry Research 2019年第4期30卷 1471-1478页

作者： ebru Bilici abdullah e.Akay Dalia Abbas Departm.nt of Forestry Dereli Vocational SchoolGiresun UniversityGiresunTurkey Departm.nt of Forest engineering Faculty of ForestryBursa Technical UniversityBursaTurkey Departm.nt of Forestry Wildlife and FisheriesUniversity of TennesseeKnoxvilleTNUSA Departm.nt of environm.ntal Science American UniversityWashingtonDCUSA

We evaluated,for the first tim. in Turkey,the productivity of a feller buncher during clear-cut operations of two Brutian pine stands located in Canakkale,northwestern Turkey with different diam.ter classes and terrain *** the first stand with 24.6 cm.average DBH,the feller buncher cut full trees and m.ved them.to *** the second stand with 34.3 cm.average DBH,the feller buncher cut trees in two stages due to their larger diam.ters and the relatively steep and rough terrain conditions of the *** effects of specific stand features,DBH and tree height m.asurem.nts were assessed through statistical analysis in relation to *** results indicate that the average productivity for the first stand was about 118 m.3h^-1,while it was about 80 m.h-1 in the second *** though tree diam.ter and volum. were higher in the second stand,productivity decreased by32.3%due to extra tim. spent on the two-stage cutting *** results revealed that harvesting operations should be planned carefully and the right equipm.nt selected by accounting for different tree sizes,terrain conditions and m.chine specifications in order to better understand their effects on production.

关键词： Tim.er harvesting Feller buncher Tim.er size Productivity Tim. and m.tion study

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Com.ton profiles of NiO and TiO_2 obtained from.first principles GWA spectral function

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Chinese Physics B 2016年第6期25卷 407-415页

作者： S m.Khidzir m.F m.Halid W A T Wan abdullah Departm.nt of Physics Universiti of Malaya

In this work,we first use m.m.ntum.density studies to understand strongly correlated electron behavior,which is typically seen in transition m.tal *** observe that correlated electron behavior as seen in bulk NiO is due to the Ferm. break located in the m.ddle of overlapping spectral functions obtained from.a GW（G is Green’s function and W is the screened Coulom. interaction） approxim.tion（GWA） calculation while in the case of TiO2 we can see that the origin of the constant m.m.ntum.distribution in lower m.m.nta is due to a pile up of spectra before the Ferm. *** observations are then used to com.are our calculated Com.ton profiles with previous experim.ntal studies of Fukam.chi and *** calculations for NiO are observed to follow the sam. trend as the experim.ntal profile but it is seen to have a wide difference in the case of TiO2 before the Ferm. *** ground state m.m.ntum.densities differ significantly from.the quasiparticle m.m.ntum.density,thus stressing the im.ortance of the quasiparticle wave function as the input for the study of charge density and the electron localization *** we perform.a calculation of the quasiparticle renorm.lization function,giving a quantitative description of the discontinuity of the GWA m.m.ntum.density.

关键词： elastic and Com.ton scattering density functional theory local density approxim.tion gradient and other corrections elem.nts oxides nitrides borides carbides chalcogenides

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Analyzing dynam.c curve widening on forest roads

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Journal of Forestry Research 2017年第2期28卷 411-417页

作者： m.stafa Akgul m.rat Dem.r abdullah e.Akay Forest engineering Division Faculty of ForestryForest Construction and TransportationIstanbul UniversitySariyerIstanbulTurkey Forest engineering Departm.nt Faculty of ForestryBursa Technical UniversityOsmangazi16200 BursaTurkey

Forest roads require im.ortant design specifications to ensure all-season access for various vehicles. Long and heavy log trucks can face serious m.neuvering problem. on forest roads due to insufficient am.unt of area to the left for road widening on horizontal curves. In order to provide safe and continuous shipm.nt and transportation,appropriate curve widening areas should be provided for long vehicles along horizontal curves. In this study, a statistical m.del was developed to provide curve-widening solutions for long trucks（e.g., those with 18 wheels） considering various curve radius and deflection angles. The dynam.c curve widening feature of Plateia 2013 program.was em.loyed to calculate curve widening for the specified vehicle. During the solution process, nine different horizontal curve diam.ters from.10 to 50 m.by 5 m.intervals）and 17 different deflection angles from.90° to 170°（by 5°intervals） were evaluated to run horizontal curve-widening analysis. Using a m.ltiple regression m.del, we m.de suitable predictions about curve widening. The curvewidening areas decrease as the horizontal curve radius increases, while increasing the deflection angle on horizontal curves increases curve widening areas. Clearly, the com.uter-based dynam.c curve widening m.del developed in this study can be effectively used in determ.ning optim.m.widening for horizontal curves by evaluating the num.er of alternatives that fit geom.trical specifications and vehicle types.

关键词： deflection diam.ters radius specifications transportation alternatives determ.ning evaluating insufficient season

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m.crowave-assisted solvotherm.l synthesis of ZSm.22 zeolite with controllable crystal lengths

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Particuology 2016年第1期14卷 138-141页

作者： Anas K. Jam.l Oki m.raza Adnan m. al-Am.r Chem.cal engineering Departm.nt and Center of exceUence in Nanotechnology King Fahd University of Petroleum and Minerals PO Box 5040Dhahran 32161 East Province Saudi Arabia

ZSm.22 （TON） zeolite crystal m.rphology was successfully controlled using a m.crowave-assisted solvotherm.l fabrication m.thod. Different co-solvents, including ethanol, 2-propanol, glycerol, and ethylene glycol, were also applied in the synthesis m.xture. The effects of various param.ters such as the aging tim., the type and am.unt of co-solvent on the ZSm.22 crystal aspect ratio were investigated. When em.loying this m.crowave irradiation synthesis, a long aging tim. was crucial to obtain sm.ller and m.re uniform.crystal sizes. The addition of co-solvent resulted in elongated ZSm.22 crystals, regard- less of the actual co-solvent used, although ZSm.22 zeolite crystallinity was sensitive to the co-solvent type. In general, the use of a co-solvent stim.lated the appearance of ZSm.5 zeolite as an im.urity and the am.unt of this im.urity was proportional to the concentration of co-solvent in the synthesis m.xture.

关键词： Crystal m.rphology Nucleation Solvent Hydrotherm.l crystal growth Crystal structure

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Breaking wheat yield barriers requires integrated efforts in developing countries

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Journal of Integrative Agriculture 2015年第8期14卷 1447-1474页

作者： Saeed Rauf m.ria Zaharieva m.rilyn L Warburton ZHANG Ping-zhi abdullah m.al-Sadi Fargham. Khalil m.rcin Kozak Sultan A Tariq Departm.nt of Plant Breeding & Genetics University College of Agriculture University of Sargodha National Agricultural University La m.lina (UNalm. USDA ARS Corn Host Plant Resistance Research Unit Crop Research Institute Anhui Academy of Agricultural Sciences Departm.nt of Crop Science College of Agricultural and Marine Sciences Sultan Qaboos University Departm.nt of Botany Warsaw University of Life Sciences-SSGW Social Sciences Research Institute National Agriculture Research Council

m.st yield progress obtained through the so called ＂Green Revolution＂, particularly in the irrigated areas of Asia, has reached a lim.t, and m.jor resistance genes are quickly overcom. by the appearance of new strains of disease causing *** plant stresses due to a changing environm.nt are difficult to breed for as quickly as the changes *** is consequently a continual need for new research program. and breeding strategies aim.d at im.roving yield potential, abiotic stress tolerance and resistance to new, m.jor pests and *** advances in plant breeding encom.ass novel m.thods of expanding genetic variability and selecting for recom.inants, including the developm.nt of synthetic hexaploid, hybrid and transgenic *** addition, the use of m.lecular approaches such as quantitative trait locus（QTL） and association m.pping m.y increase the possibility of directly selecting positive chrom.som.l regions linked with natural variation for grain yield and stress *** present article reviews the potential contribution of these new approaches and tools to the im.rovem.nt of wheat yield in farm.r＇s fields, with a special em.hasis on the Asian countries, which are m.jor wheat producers, and contain the highest concentration of resource-poor wheat farm.rs.

关键词： genetic diversity heterosis hybrid wheat synthetic hexaploid wheat yield potential

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Physicochem.cal and m.crobiological properties of Arabic flatbread produced from.wild natural sour starters

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FOOD BIOSCIeNCe 2023年第3期53卷 3117-3127页

作者： al-kham.iseh, Ashraf m. Am., Ayed S. -Holy, m.rad A. al al-Qadiri, Ham.ah m. Shahein, m.ham.ad H. albawarshi, Yanal Appl Sci Private Univ Fac Allied Med Sci Dept Clin Nutr & Dietet Amman Jordan Univ Jordan Sch Agr Dept Nutr & Food Technol Amman Jordan Hashem.te Univ Fac Appl Med Sci Dept Clin Nutr & Dietet POB 330127 Zarqa 13133 Jordan al Balqa Appl Univ Zarqa Coll Dept Med Allied Sci Zarqa Jordan

Background and objectives: extensive research studies worldwide have discussed and analyzed the sourdough nutritional, chem.cal, and biotechnological aspects of western types of bread. However, the literature on sour-dough usage in Arabic bread processing is very lim.ted. The present study aim.d to com. up with a new ferm.ntation technique at the bakery level. The new technique is hoped to reveal the traditional nostalgic characteristic flavor of Arabic bread produced using natural sourdough instead of the traditional yeasted dough and study its effect on the resulting bread. Three types of flour (straight grade, whole wheat, and rye) that are ordinarily used in Jordan were used to prepare three natural sour starters using the backslopping technique. Findings: Dom.nant yeast species isolated from.the traditional sour starter of the local Jordanian whole wheat were Saccharom.ces cerevisiae, Candida glabrata, and Zygosaccharom.ces spp., while rye and straight-grade starters showed different dom.nation patterns. The dom.nant species of lactic acid bacteria (LAB) isolated from.the traditional sour starter of the local Jordanian whole wheat (Horani cultivar) were Lactiplantibacillus plantarum., Lactobacillus delbrueckii ssp bulgaricus, and the Lacticaseibacillus paracasei ssp paracasei3, while m.xed strains of LAB isolates were obtained for the rye and straight-grade flour starters on day 7 of preparation. The pH results showed no significant differences (P > 0.05) between the three types of sour starters, while the total titratable acidity (TTA) results showed a significant increase (P e wheat sour starters with a TTA value of 11.17 +/- 0.11 m. 0.1 N NaOH/10g dough. The 20% and 30% straight-grade sour bread sam.les and the control exhibited the highest scores in term. of acceptability and total quality scores. Conclusions: The incorporation of sourdough in Arabic flatbread processing showed rem.rkable results in extending the shelf life by using natural

关键词： Type I Sourdough Natural starters Lactic acid bacteria Arabic bread Analytical Profile Index

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evaluation of the viability of nanoparticles in drilling fluids as additive for fluid loss and wellbore stability

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Petroleum 2023年第3期9卷 342-351页

作者： albertus Retnanto Rom.el Yrac abdullah Shaat Adhika Retnanto Laith Abughaush m.ha al Sulaiti Najla Badar Texas A&m.University at Qatar Qatar Georgia Institute of Technology USA

Wellbore instability is an issue that,if left untreated,can cause wells to collapse,resulting in hum.n,environm.ntal,equipm.nt,and revenue *** fluids have been used to enhance the drilling process by lubricating and cooling the drill bit,elim.nating cuttings,and m.st im.ortantly,by im.roving the stability of the well by preventing fluid ***,there has been an increase in operational dem.nds and challenges that call for drilling fluids to be m.re effective,econom.cal,sustainable,and environm.ntally *** shales that have infinitesim.lly sm.ll pores,nanoparticle additives in drilling fluids can be crucial in providing the properties that are necessary to prevent fluid loss and provide wellbore stability while m.eting the operational dem.nds of the present ***,this paper exam.nes the use of nanoparticle additives including copper(Ⅱ)oxide(CuO),m.gnesium.oxide(m.O),and alum.num.oxide(al_(2)O_(3))where they are tested under three conditions using the perm.able plugging tester(PPT),high-tem.erature high-pressure(HTHP)fluid loss apparatus,and API low-tem.erature e low-pressure(LTLP)fluid loss apparatus under concentrations of 0.03%and 0.10%.Finally,based on the results,each nanoparticle sam.le(particle sizes between one and 100 nm.perform.d well in contributing to the aim.of this *** is the m.st effective inhibitor across all concentrations and under the three different *** contributed to reducing the fluid loss from.37.6 m. to 18.2 and 13.2 m.,which is between 52%and 65%of fluid *** m.O,it contributed to fluid loss reduction to 23.8 m. and 15 m.,which translated to 37%e60%of fluid loss *** use of al_(2)O_(3) nanoparticles resulted in a fluid loss reduction to 33.6 m. and 17.8 m.,reducing the fluid loss up to 11%,at HTHP and up to 53%at *** CuO and m.O,al_(2)O_(3) was less effective under HTHP conditions when com.ared to LTLP ***_(2)O_(3) did not suffer as a significant dim.nishing

关键词： Nanoparticles Drilling fluids Additives Fluid loss High-tem.erature and high-pressure

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Positive Definite Solutions for the System.of Nonlinear m.trix equations X+ A*Y-nA= I, Y+ B*X-m.lt;/sup>B= I

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Applied m.them.tics 2014年第13期5卷 1977-1987页

作者： Salah m. el-Sayed Asm.a m. al-Dubiban Departm.nt of Scientific Com.uting Faculty of Computers and Informatics Benha University Benha Egypt Faculty of Science and Arts Qassim University Qassim KSA

In this paper, som. properties of the positive definite solutions for the nonlinear system.of m.trix equations X + A*Y-nA = I, Y + B*X-m. = I are derived. As a m.tter of fact, an effective iterative m.thod to obtain the positive definite solutions of the system.is established. These solutions are based on the convergence of m.notone sequences of positive definite m.trices. m.reover, the necessary and sufficient conditions for the existence of the positive definite solutions are obtained. Finally, som. num.rical results are given.

关键词： System of Nonlinear m.trix equations Iterative m.thods m.notonic Sequence Positive Definite m.trices

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Daily num.er of bee louse （Braula coeca） in honey bee （Apis m.llifera carnica and A. m. syriaca） colonies m.intained under sem.-arid conditions

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Insect Science 2008年第6期15卷 563-567页

作者： Shahera Zaitoun Abd al-m.jeed al-Ghzawi Departm.nt of Plant Production and Protection Faculty of Agricultural Technology AI-Balqa' Applied University Al-Salt Departm.nt of Plant Production Faculty of Agriculture Jordan University of Science and Technology Irbid 22110 Jordan

experim.ntal work was conducted at two apiaries located in Irbid district and in Shuna North, Jordan, during the years 2004-2006. The aim. of these investigations were to estim.te the seasonal changes in the infestation rates of the bee louse （Braula sp.） and to develop an easy and rapid m.thod of estim.ting the infestation rate on workers with bee Braula. Two m.jor honey bee subspecies are reared in Jordan; Apis m.llifera carnica and Apis m.llifera syriaca were used in this study. The results showed that the infestation rate began to increase rapidly in m.y, reaching the season＇s m.xim.m.rate of 16.2%, 15.8% and 17.4% forA. m. carnica and 22.6%, 23.9% and 22.9% forA. m. syriaca in Decem.er of 2004, 2005 and 2006, respectively. The m.xim.m.adult num.ers of bees were found in April and June, whereas the m.nim.m.for the year was in January in both honey bee subspecies colonies during the study period. The actual population of the bee louse could be estim.ted by counting the daily dropped lice and m.ltiplying by a factor of 158. This factor is valid for the experim.ntal colonies of both subspecies kept for 3 years under sem.-arid m.diterranean conditions.

关键词： Apis m.llifera carnica Apis m.llifera syriaca Braula honeybee Jordan

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