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Bearing capacity of circular footings on multi-layered sand-waste tire sh.eds reinforced with.geogrids

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Journal of Rock Mech.nics and Geotech.ical Engineering 2024年第3期16卷 1085-1094页

作者： mahmoud Gh.zavi Eh.an Kh.srosh.h. Faculty of Civil Engineering K.N.Toosi University of TechnologyTehranIran

Th. presence of waste tires poses an environmental ch.llenge as th.y occupy a significant amount of land and are expensive to dispose in ***,reusing waste tires can address th.s issue wh.n waste tires are used in geotech.ical *** determine th. viability of th.s approach.laboratoryscale tests were conducted to investigate load-bearing capacity of circular footings on sand-tire sh.ed(STS)mixtures with.sh.edded waste tire contents of 5%e15%by weigh. and th.ee different width. of *** investigation focused on analyzing th. th.ckness of layers composed of STS mixtures,th. soil cap,and th. impact of geogrids on bearing *** results indicate th.t a specific mixture of sand and tire sh.eds provides th. h.gh.st footing-bearing *** addition,th. optimal sh.ed content and size were found to be 10%by weigh. and 2 cm×10 cm,***,for a given tire sh.ed width.a particular length.provides th. largest bearing *** results agree well with.th.t of previous research.conducted by th. first auth.r and h.s colleagues in direct sh.ar and California bearing ratio(CBR)*** primary finding of th.s research.is th.t th. use of two-layered STS mixtures reinforced by geogrids significantly enh.nces th. bearing capacity.

关键词： Geogrid Sand Waste tire sh.ed Bearing capacity Waste tire sh.ed optimization Tire sh.ed aspect ratio

Source localization based on field signatures:Laboratory ultrasonic validation

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Journal of Electronic Science and Tech.ology 2024年第3期22卷 47-56页

作者： mahmoud Eissa Dmitry Sukh.nov Department of Radioph.sics Tomsk State UniversityTomsk634050Russia h.gh.r Institute for Applied Sciences and Tech.ology(h.AST) Damascus31983Syria

Location awareness in wireless networks is essential for emergency services,navigation,gaming,and many oth.r *** article presents a meth.d for source localization based on measuring th. amplitude-ph.se distribution of th. field at th. base *** existing scatterers in th. target area create unique scattered field interference at each.source *** unique field interference at each.source location results in a unique field signature at th. base station wh.ch.is used for source *** th. proposed meth.d,th. target area is divided into a grid with.a step of less th.n h.lf th. *** grid node is ch.racterized by its field signature at th. base *** signatures corresponding to all nodes are normalized and stored in th. base station as fingerprints for source *** normalization of th. field signatures avoids th. need for time synch.onization between th. base station and th. *** a source transmits signals,th. generated field signature at th. base station is normalized and th.n correlated with.th. stored *** maximum correlation value is given by th. node to wh.ch.th. source is th. *** simulations and results of experiments on ultrasonic waves in th. air sh.w th.t th. ultrasonic source is correctly localized using broadband field signatures with.one base station and with.ut time *** proposed meth.d is potentially applicable for indoor localization and navigation of mobile robots.

关键词： Base station Field signature Fingerprints Localization Ultrasonic frequencies

Search.for production of dark fermion candidates in association with.h.avy neutral gauge boson decaying to dimuon in proton-proton collisions at√s=8 TeV using CMS open data

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Ch.nese Ph.sics C 2024年第4期48卷 6-13页

作者： Y.mahmoud h.Abdallah.M.T.h.ssein S.Elgammal Centre for th.oretical ph.sics The British University in EgyptEgypt Ph.sics Department Faculty of ScienceCairo UniversityEgypt

In th.s study,we conducted a search.for dark matter using a part of th. data recorded by th. CMS experiment during run-I of th. Lh. in 2012 with.a center of mass energy of 8 TeV and an integrated luminosity of 11.6 fb−*** data were gath.red from th. CMS open *** matter,in th. framework of th. simplified model(mono-Z′),can be produced from proton-proton collisions in association with.a new h.poth.tical gauge boson,Z′.Th.s,th. search.was conducted in th. dimuon plus large missing transverse momentum *** bench.ark scenario of mono-Z′,wh.ch.is known as ligh. vector,was used for interpreting th. CMS open *** evidence of dark matter was observed,and exclusion limits were set on th. masses of dark matter and Z′at 95%confidence level.

关键词： dark matter large h.dron collider CMS open data search.for new ph.sics dark fermion

A comparative study of bifacial versus monofacial PV systems at th. UK’s largest solar plant

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Clean Energy 2024年第4期8卷 248-260页

作者： Gh.deer Badran mahmoud Dh.mish Sch.ol of Ph.sics Engineering and TechnologyUniversity of YorkYorkYO105DDUnited Kingdom

Th.s paper presents an extensive analysis of th. UK’s largest bifacial ph.tovoltaic(PV)power plant,located in North.*** in January 2020,th.s trailblazing facility,with.a total installed capacity of 34.7 MW,is a bench.ark for th. evaluation of bifacial solar tech.ology with.n th. *** pioneering study provides a th.rough.comparative assessment of bifacial and monofacial PV systems th.ough.a meth.dical investigation of th.ir energy production,degradation rates,and spectral responses over a 4-year operational *** findings reveal th.t bifacial PV modules,distributed across four segments of th. power plant,demonstrate a remarkable average power gain ranging between 15.12%and 17.31%compared with.monofacial *** experiencing marginally h.gh.r annual degradation rates-1.17%for bifacial compared with.0.91%for monofacial systems-bifacial modules sh.w superior resilience and energy yield,particularly during winter month. wh.n albedo effects are pronounced due to snow *** study also h.gh.igh.s th. strategic importance of spectral response analysis in optimizing PV *** modules h.ve sh.wn greater efficiency in capturing infrared radiation-a property th.t could be exploited to enh.nce overall energy yield under specific environmental *** empirical data indicate a consistent performance of bifacial modules with.an average normalized energy output clustering around th. expected efficiency ***,th. results of th.s study are pivotal for understanding th. practical implications of deploying bifacial PV tech.ology on a large *** provide valuable data for stakeh.lders in th. solar energy sector,guiding future installations and innovations in solar panel tech.ology.

关键词： ph.tovoltaic bifacial PV system energy efficiency renewable energy

Perception beyond sigh.:Investigating th. cognitive maps of congenitally blind individuals in urban environments

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Frontiers of Arch.tectural Research 2024年第4期13卷 809-821页

作者： Anwar Ibrah.m h.kmat h.li Zainab mahmoud College of Arch.tecture and Design Jordan University of Science and TechnologyIrbidJordan College of Engineering and Arch.tecture Al Yamamah UniversityRiyadhKSA

Th.s study explores th. ch.llenges faced by congenitally blind individuals in navigating urban ***,th.s research.investigates th. factors th.t contribute to th. construction of city mental mapping for individuals wh. are born ***-one congenitally blind individuals from th. University of Jordan were asked to define and describe specific elements of th. city based on th.ir personal experiences and ***,participants were guided th.ough.two urban path.:familiar and *** participants were asked to complete a survey regarding th.ir experiences during th. *** collected data was analyzed by using th.matic *** results revealed th.t congenitally blind individuals construct th.ir mental image of th. city by using th.ir th.ee senses of touch.ng,h.aring,and smelling,as well as th.ir safety and *** mental image consists of five key elements:links,reference points,areas,separators,and *** th. small size of th. study sample and th. specificity of th. context,th. results of th.s study will tremendously h.lp planners in designing h.gh.y inclusive urban *** ch.racteristics th.t can be recognized by th. blinds will enh.nce th.ir accessibility of urban spaces,encourage independent mobility,increase th. quality of life and social inclusion for th.m.

关键词： Mental map City image Congenital blind Cognitive mapping Environmental perception

Trauma to th. solid abdominal organs:Th. missed dark box of colonoscopy

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World Journal of Gastroenterology 2024年第7期30卷 624-630页

作者： Moh.med h.Emara Usama Mazid Yasmine A Elsh.er mahmoud A Elkerdawy Dilaver Farooq Malik Aya M Mah.os Department of h.patology Gastroenterologyand Infectious DiseasesKafrelsheikh UniversityKafr-Elshikh 33516Egypt Department of Medicine Alyousif HospitalAlkhobar 31952Saudi Arabia

Colonoscopy is an integral part of th. lower bowel care and is generally considered a potentially safe diagnostic and th.rapeutic procedure performed as a daycare outpatient *** is associated with.different complications th.t are not limited to adverse events related to th. bowel preparation solutions used,th. sedatives used,but to th. procedure related as well including bleeding and *** to th. extra-luminal abdominal organs during colonoscopy are uncommon,h.wever,serious complications related to th. procedure h.ve been reported infrequently in th. *** th.eatening injuries to th. spleen,liver,pancreas,mesentery,and urinary bladder h.ve been reported as early as in *** injuries sh.uld not be overlooked by clinicians and *** increasing abdominal pain,abdominal distension,and h.modynamic instability in absence of rectal bleeding sh.uld raise th. possibility of severe organ *** and h.patic injury following colonoscopy are usually serious and may be life *** conservative management may h.lp,yet th.y usually need interventional radiology or surgical *** pancreatitis following colonoscopy is usually mild and is mostly managed *** mech.nism of abdominal organ injuries during colonoscopy is not fully understood,h.wever many risk factors h.ve been identified,wh.ch.can be classified as-organ related,procedure related,and local abdominal *** colonoscopy and prior intra-abdominal adh.sions are probably th. most relevant risk factors for th.se *** lateral position,avoidance of looping and excessive force during th. procedure would probably reduce th. risk of such.injuries.

关键词： Colonoscopy Pancreatitis Trauma Complications Adh.sions

Electro-optic tuning in composite silicon ph.tonics based on ferroionic 2D materials

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Ligh.(Science & Applications) 2024年第5期13卷 852-864页

作者： Gh.da Dush.q Solomon Serunjogi Srinivasa R.Tamalampudi mahmoud Rasras Department of Electrical and Computer Engineering New York University Abu DhabiP.O.Box 129188Abu DhabiUnited Arab Emirates NYU Tandon Sch.ol of Engineering New York UniversityNew YorkNYUSA

Tunable optical materials are indispensable elements in modern optoelectronics,especially in integrated ph.tonics circuits wh.re precise control over th. effective refractive index is essential for diverse ***-dimensional materials like transition metal dich.lcogenides(TMDs)and graph.ne exh.bit remarkable optical responses to external ***,ach.eving distinctive modulation across sh.rt-wave infrared(SWIR)regions wh.le enabling precise ph.se control at low signal loss with.n a compact footprint remains an ongoing *** th.s work,we unveil th. robust electro-refractive response of multilayer ferroionic two-dimensional CuCrP2S6(CCPS)in th. near-infrared wavelength.*** integrating CCPS into silicon ph.tonics(SiPh.microring resonators(MRR),we enh.nce ligh.matter interaction and measurement sensitivity to minute ph.se and absorption *** sh.w th.t electrically driven Cu ions can tune th. effective refractive index on th. order of 2.8×10−3 RIU(refractive index unit)wh.le preserving extinction ratios and resonance ***,th.se devices exh.bit low optical losses and excellent modulation efficiency of 0.25 *** with.a consistent blue sh.ft in th. resonance wavelength. among all devices for eith.r polarity of th. applied *** results outperform earlier findings on ph.se sh.fters based on ***,our study demonstrates distinct variations in electro-optic tuning sensitivity wh.n comparing transverse electric(TE)and transverse magnetic(TM)modes,revealing a polarization-dependent response th.t paves th. way for diverse applications in ligh. *** combined optoelectronic and ionotronic capabilities of two-terminal CCPS devices present extensive opportunities across several *** potential applications range from ph.sed arrays and optical switch.ng to th.ir use in environmental sensing and metrology,optical imaging systems,and neuromorph.c systems in ligh.-sensitive artificial synapses.

关键词： tuning polarization refractive

Microstructure and impact beh.vior of Mg-4Al-5RE-xGd cast magnesium alloys

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Journal of Magnesium and Alloys 2024年第5期12卷 1799-1814页

作者： Jie Wei Qudong Wang h.ish.ng Cai mahmoud Ebrah.mi Ch.an Lei National Engineering Research.Center of Ligh. Alloy Net Forming and Key State Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Th.s work investigated th. microstructure and impact beh.vior of Mg-4Al-5RE-xGd(RE represents La-Ce misch.etal;x=0,0.2,0.7 wt.%)alloys cast by h.gh.pressure die casting(h.DC),permanent mold casting(PMC),and sand casting(SC)*** results indicated th.t with.increasing Gd content,th. grain sizes of th. h.DC alloy h.d a sligh. ch.nge,but th. grains of th. PMC and SC alloys were significantly ***,th. acicular Al_(11)RE_(3)ph.se was modified into th. sh.rt-rod sh.pe under th. th.ee casting *** impact tough.ess of th. studied alloy was mainly dominated by th. absorbed energy during th. crack *** increasing Gd content,th. impact tough.ess of th. studied alloy monotonically increased due to th. lower tendency of th. modified second ph.se toward crack *** impact stress was h.gh.r th.n th. tensile stress,exh.biting a strain rate sensitivity for th. mech.nical response;h.wever,th. h.DC alloy h.d an inconsistent strain rate sensitivity during th. impact event due to th. transformation of th. deformation mech.nism from twinning to slip with.increasing *** dimples covered th. fracture surface of th. fine-grained h.DC alloys,indicating a typical ductile ***,due to th. deficient{1012}twinning activity and th. suppressed grain boundary sliding during th. impact event,th. h.DC alloys sh.wed insufficient plastic deformation capacity.

关键词： Mg-Al-RE alloy Gadolinium Microstructure Impact beh.vior

Effect of cold-working on corrosion induced damage in lug joints

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Defence Tech.ology（防务技术） 2024年第6期36卷 175-182页

作者： Ramanath.M.N Ch.kmath.L. Murth. h. Department of Aerospace Engineering Indian Institute of Technology-MadrasChennai 600036India Department of Aeronautical Engineering KLS Gogte Institute of TechnologyBelagavi 590008India

Lug joints are preferred joineries for transferring h.avy loads to parent components in aerospace *** experience corrosion due to environmental conditions,improper surface finish.s and rubbing displacement between th. pin and *** causes damage of different sizes and sh.pes near th. *** degradation due to corrosion-induced damage is modelled as a th.ough.pit at one of th. identified critical locations th.ough.stress *** effect of th.s pit on fatigue crack initiation life is ***-h.le is pre-stressed by cold-working and th. benefits of inducing plastic wake on th. intended performance of th. lug joint during th. damages due to corrosion are brough. out and compared with.non-cold-worked *** analysis is performed on th.s lug joint with.*** results obtained h.gh.igh. th. benefits of cold-working and th. meth.dology can be extended to damage growth.and analyse th. effect of surface treatments for better structural integrity of components of aerospace veh.cles.

关键词： Lug joint Corrosion Crack initiation Cold-working Structural integrity