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Journal of Magnesium and Alloys 2019年第1期7卷 155-165页

作者： I.Dinaharan S.C.Vettivel M.Balakrishnan e.t.akinlabi Department of Mechanical engineering Science University of JohannesburgAuckland Park Kingsway CampusJohannesburg 2006 GautengSouth Africa Department of Mechanical engineering Chandigarh College of Engineering and TechnologyChandigarh 160019India Department of Mechanical engineering Nehru Institute of Engineering and TechnologyCoimbatore 641105 Tamil NaduIndia

Utilizing fly ash(FA)as reinforcement for magnesium matrix composites(MMCs)brings down the production cost and the land *** alloy AZ31 was reinforced with FA particles(10 vol.%)successfully by two different processing methods namely conventional stir casting and friction stir processing(FSP).the microstructural features were observed using optical microscope,scanning electron microscope and electron backscatter *** sliding wear behavior was tested using a pin-on-disc wear *** stir cast composite showed inhomogeneous particle dispersion and coarse grain *** of the FA particles decomposed and reacted with the matrix alloy to produce undesirable ***,FSP composite showed superior particle dispersion and fine,equiaxed grains by dynamic *** particles encountered disintegration but there was no interfacial *** composite demonstrated higher strengthening and wear resistance to that of stir cast *** morphology of the worn surface and the wear debris were studied in detail.

关键词： Magnesium matrix composite Stir casting Friction stir processing Fly ash Wear

Free vibration and transient response of double curved beams connected by intermediate straight beams

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Applied Mathematics and Mechanics(english edition) 2025年第1期46卷 37-62页

作者： R.A.JAFARI-tALOOKOLAeI H.GHANDVAR e.JUMAeV S.KHAtIR t.CUONG-Le School of Mechanical engineering Babol Noshirvani University of Technology Department of Mechanical engineering Faculty of Engineering New Uzbekistan University University of Business and Science Center for engineering Application and technology Solutions Ho Chi Minh City Open University

this paper investigates the free vibration and transient response of interconnected structures including double curved beams and intermediate straight beams,which are all constructed from functionally graded porous(FGP) materials. the strain potential and kinetic energies of each beam along with the work done by the external force are calculated. Additionally, a higher-order beam element is introduced to derive stiffness and mass matrices, along with the force vector. the curved and straight beams are discretized, and their assembled stiffness, mass matrices, and force vectors, are *** conditions at the joints are used to derive the total matrices of the entire structure. Subsequently, the natural frequencies and transient response of the system are determined. the accuracy of the mathematical model and the self-developed computer program is validated through the comparison of the obtained results with those of the existing literature and commercial software ANSYS, demonstrating excellent ***, a comprehensive study is conducted to investigate the effects of various parameters on the free vibration and transient response of the considered structure.

关键词： double curved beam finite element method functionally graded porous (FGP) material intermediate straight beam O313 vibration analysis

Magnetosymbiosis discovery:new perspectives in magnetotaxis research

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Journal of Oceanology and Limnology 2025年第1期43卷 177-186页

作者： Caroline L.MONteIL Christopher t.LeFeVRe Aix-Marseille Université CEACNRSInstitute of Biosciences and Biotechnologies of Aix-MarseilleSaint-Paul-lez-Durance 13115France

Magnetotactic bacteria have been the only known magnetoreceptive microorganisms for *** if the existence of magnetotactic protists was suggested in 1986,this is only 30 years later that magnetotaxis was extended to the domain of eukaryota,thanks to the characterization of magnetotactic symbiotic assemblies composed of a flagellated protist and bacteria biomineralizing magnetic *** mutualistic ectosymbiosis relies on a collective magnetotaxis coupled to a hydrogen-based *** new form of cooperation challenges our view of magnetic biomineralization in prokaryotes and magnetoreception in *** this review,we present how magnetosymbiosis was discovered and how cooperation ***,we discuss the future research and the new perspectives such discovery brought to the field of magnetotaxis.

关键词： magnetotaxis biomineralization symbiosis magnetotactic

An overview of biomass solid fuels:Biomass sources,processing methods,and morphological and microstructural properties

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Journal of Bioresources and Bioproducts 2023年第4期8卷 333-360页

作者： Segun e.Ibitoye Rasheedat M.Mahamood tien-Chien Jen Chanchal Loha esther t.akinlabi Department of Mechanical engineering Science Faculty of Engineering and the Built EnvironmentUniversity of JohannesburgAuckland Park2006524South Africa Department of Mechanical engineering Faculty of Engineering and TechnologyUniversity of IlorinIlorin P.M.B.1515Nigeria energy Research and technology Group CSIR-Central Mechanical Engineering Research InstituteWest BengalDurgapur-713209India Department of Mechanical and Construction engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle NE18STUnited Kingdom

Biomass solid fuel(BSF)has emerged as a promising renewable energy source,but its morphological and microstructural properties are crucial in determining their physical,mechanical,and chemical *** paper provides an overview of recent research on *** focus is on biomass sources,BSF processing methods,and morphological and microstructural properties,with a special emphasis on energy-related *** inclusion and exclusion criteria were established for the study to ensure *** inclusion criteria encompassed studies about BSFs and studies investigating the influence of biomass sources and processing methods on the morphological and microstructural properties of solid fuels within the past five *** technologies for converting biomass into usable energy were discussed,including gasification,torrefaction,carbonization,hydrothermal carbonization(HtC),and *** has advantages and disadvantages in energy performance,techno-economics,and climate *** is efficient but requires high *** produces bio-oil,char,and gases based on feedstock *** generates low-cost biochar for solid fuels and carbon sequestration *** increases energy density for co-firing with *** processes wet biomass efficiently with lower energy *** treatment affects BSF durability and strength,often leading to less durability due to voids and gaps between *** carbonization alters surface morphology,creating cavities,pores,and distinctive *** pyrolysis generates biochar with better morphological properties,while fast pyrolysis yields biochar with lower porosity and surface *** constitutes 67%of the biomass sources utilized for bioenergy generation,followed by wood residues(5%),agro-residues(4%),municipal solid wastes(3%),energy crops(3%),livestock wastes(3%),and forest residues(1%).each source has advantages and drawbacks,such as avail

关键词： Biomass feedstock Microstructural property Morphological property Renewable energy thermal treatment

transport mechanism in chemically reactive hybrid nanofluid flow containing gyrotactic micro-organisms over a curved oscillatory surface

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Applied Mathematics and Mechanics(english edition) 2025年第1期46卷 177-192页

作者： M.NAVeeD M.IMRAN t.ASGHAR Z.ABBAS Department of Mathematics Division of Science and TechnologyUniversity of Education Department of Mathematics The Islamia University of Bahawalpur

this paper examines the transport analysis, including both heat transfer and mass transfer, in hybrid nanofluid flow containing gyrotactic microorganisms towards a curved oscillatory surface. the influence of magnetic fields is also inspected in terms of their physical characteristics. to depict the phenomena of transport, modified versions of both Fick's and Fourier's laws are used. Additionally, the characteristics of both heterogeneous and homogeneous chemical reactions are also incorporated. Utilizing a curvilinear coordinate system, the flow problem is formulated as partial differential equations(PDes)for momentum, concentration, microorganism field, and energy. An analytical solution to the obtained flow equations is achieved utilizing the homotopy analysis method(HAM).the effects of significant flow parameters on the pressure and microorganism fields, velocity, oscillation velocity, concentration, and temperature distributions are shown via graphs. Furthermore, the variations in skin friction, mass transfer rate, heat transfer rate, and local motile number due to different involved parameters are presented in tables and are analyzed in detail. Graphical results indicate that the curves of velocity and temperature fields are enhanced as the values of the solid volume fraction variables *** is also verified that the concentration rate field decreases as the values of the homogeneous reaction strength parameter and the radius of curvature parameter increase, and it increases with the Schmidt number and the heterogeneous reaction strength *** outcomes show a favorable response of the motile number to advanced values of the Peclet number, the Schmidt number, the microorganism difference parameter, and the bio-convective Lewis number.

关键词： analytical solution Cattaneo-Christov heat and mass flux chemical reaction gyrotactic microorganism hybrid nanofluid O368 oscillating curved stretchable sheet

effects of processing parameters on corrosion properties of dissimilar friction stir welds of aluminium and copper

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transactions of Nonferrous Metals Society of China 2014年第5期24卷 1323-1330页

作者： esther t.akinlabi Anthony ANDReWS Stephen A.akinlabi Department of Mechanical engineering Science University of JohannesburgAuckland Park Kingsway Campus Department of Materials engineering Kwame Nkrumah University of Science and Technology School of Mechanical Industrial and Aeronautical Engineering University of Witwatersrand

the influence of friction stir welding processing parameters on dissimilar joints conducted between aluminium alloy （AA5754） and commercially pure copper （C11000） was studied. the welds were produced by varying the rotational speed from 600 to 1200 r/min and the feed rate from 50 to 300 mm/min. the resulting microstructure and the corrosion properties of the welds produced were studied. It was found that the joint interfacial regions of the welds were characterized by interlayers of aluminium and copper. the corrosion tests revealed that the corrosion resistance of the welds was improved as the rotational speed was increased. the corrosion rates of the welds compared to the base metals were improved compared with Cu and decreased slightly compared with the aluminium alloy. the lowest corrosion rate was obtained at welds produced at rotational speed of 950 r/min and feed rate of 300 mm/min which corresponds to a weld produced at a low heat input.

关键词： aluminium alloy copper corrosion friction stir weld processing parameters

Altered microRNA composition in the uterine lumen fluid in cattle(Bos taurus)pregnancies initiated by artificial insemination or transfer of an in vitro produced embryo

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Journal of Animal Science and Biotechnology 2025年第1期16卷 76-91页

作者： Fernando H.Biase Sarah e.Moorey Julie G.Schnuelle Soren Rodning Martha Sofia Ortega thomas e.Spencer School of Animal Sciences Virginia Polytechnic Institute and State University175 W Campus DrBlacksburgVA 24061USA Department of Animal Science University of TennesseeKnoxvilleTN 37996USA Department of Clinical Sciences Auburn UniversityAuburnAL 36849USA Department of Animal Science Auburn UniversityAuburnAL 36849USA Department of Animal and Dairy Sciences University of Wisconsin MadisonMadisonWI 53706USA Division of Animal Sciences University of MissouriColumbiaMO 65211USA

Background MicroRNAs(miRNAs)are presented in the uterine lumen of many mammals,and in vitro experiments have determined that several miRNAs are important for the regulation of endometrial and trophoblast *** aim was to identify and contrast the miRNAs present in extracellular vesicles(eVs)in the uterine lumen fluid(ULF)at the onset of attachment in cattle pregnancies(gestation d 18)initiated by artificial insemination(AI)or by the trans-fer of an in vitro-produced blastocyst(IVP-et).A third group had no conceptus after the transfer of an IVP *** the abundance of 263 annotated miRNAs was quantified in the eVs collected from *** was an increase in the transcript abundance of 20 miRNAs in the ULF eVs from the AI pregnant group,while 4 miRNAs had a lower abundance relative to the group not containing a ***,4 miRNAs were more abun-dant in ULF eVs in the AI pregnant group relative to IVP-et group(bta-mir-17,bta-mir-7-3,MIR7-1,MIR18A).Specific miRNAs in the ULF eVs were co-expressed with messenger RNAs expressed in extra-embryonic tissues and endome-trium,including genes that are known to be their *** the results provide biological insights into the participation of miRNAs in the regulation of trophoblast proliferation and differentiation,as well as in endometrium *** knowledge that in vitro cultured embryos can contribute to the altered abundance of specific miRNAs in the uterine lumen can lead to the development of cor-rective approaches to reduce conceptus losses during the first month of pregnancy in cattle.

关键词： Artificial reproductive technology Cattle Conceptus embryos endometrium Small RNA

Abrasive wear behavior of functionally graded Al_(3)ti reinforced aluminum matrix composite

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China Foundry 2025年第1期22卷 45-54页

作者： eylül tuğçe Yaman Yildiz Ömer Savaş Muhammed Soner Başer engin Kocaman Ince Shipping Group 34724IstanbulTurkey Yildiz technical University Faculty of Naval Architecture and Maritime34349IstanbulTurkey Ministry of transport and Infrastructure General Directorate of Marine Affairs06338AnkaraTurkey Zonguldak Bulent ecevit University Faculty of EngineeringDepartment of Aerospace Engineering67100ZonguldakTurkey

Aluminum alloys are widely used in industry due to their light *** alloys are generally exposed to abrasive wear,which diminishes their effective *** wear resistance of these alloys is enhanced by adding various reinforcements,however,this enhancement comes at the cost of reduced fracture *** paradox of increased wear resistance versus decreased fracture toughness in aluminum alloys can be resolved by using functionally graded materials (FGMs).this study focuses on the abrasive wear behavior of functional graded aluminum matrix composites reinforced with Al_(3)ti *** wear properties of the composites were investigated by considering the characteristics of the composite such as matrix type and various composite zones,as well as the wear parameters such as abrasive particle diameter,load,sliding speed and *** method was used in the abrasive wear tests in order to get more reliable results in a timeefficient *** recipes were created based on the L_(27)(3^(6)) orthogonal *** a result of the study,it is observed that the wear resistance of the composites increases with an increase in Al_(3)ti reinforcement content and hardness of the *** addition,the size of abrasive particles and the applied load are significant factors affecting abrasive wear.

关键词： functionally graded Al_(3)ti taguchi abrasive wear

Circadian nutrition:is meal timing an elixir for fatigue?

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Science Bulletin 2025年第3期70卷 309-312页

作者： Zhihui Zhang Lu Yan Jonas t.treebak Min-Dian Li Department of Cardiovascular Medicine Center for Circadian Metabolism and Cardiovascular DiseaseSouthwest HospitalArmy Medical UniversityChongqing 400038China Ministry of education(MOe)Key Laboratory of Geriatric Cardiovascular and Cerebrovascular Disease Chongqing 400038China Novo Nordisk Foundation Center for Basic Metabolic Research Faculty of Health and Medical SciencesUniversity of CopenhagenCopenhagen 2200Denmark

Fatigue is increasingly prevalent in industrialized societies,highlighting an urgent need for effective clinical and lifestyle *** manifests as reduced muscle endurance,strength and a persistent sensation of exhaustio... 详细信息

关键词： fatigue strength sensation

Advances and challenges in diagnosing and managing adult autoimmune enteropathy

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World Journal of Gastroenterology 2025年第2期31卷 128-131页

作者： Grigorios Christodoulidis Sara e Agko Marina N Kouliou Konstantinos e Koumarelas Dimitris Zacharoulis Department of General Surgery University Hospital of LarissaLarissa 41110Greece Department of Intensive Care Unit Asklepios Paulinen Clinic WiesbadenWiesbaden 65197Germany Department of emergency Medicine General Hospital of LarissaLarissa 41221Greece Department of Surgery University Hospital of LarissaLarissa 41334Greece

Autoimmune enteropathy(AIe)is a rare immune mediated disorder primarily affecting children,characterized by chronic diarrhea,malabsorption,vomiting,weight loss and villous *** has also been observed in adults presenting diagnostic and treatment challenges due to its overlap with other gastrointestinal disorders such as celiac *** diagnostic criteria for AIe include small bowel villous atrophy,lack of response to dietary restrictions,presence of anti-enterocyte antibodies,and predisposition to autoimmunity without severe *** criteria emphasize characteristic histological findings and exclusion of other causes of villous *** is associated with various autoimmune disorders and can present with overlapping features with Celiac disease,including villous atrophy but without significant intraepithelial *** primarily involves immunosuppression using corticosteroids,calcineurin inhibitors,and anti-tumor necrosis factor therapy,alongside nutri-tional *** the challenges,understanding AIe’s diverse manifest-ations and improving diagnostic criteria are essential for effective management and improved patient *** research is needed to elucidate the pathogenesis,disease progression and long-term outcomes of AIe.

关键词： Autoimmune enteropathy Diagnosis Prognosis Adult autoimmune enter-opathy and challenges Autoimmune enteropathy and treatment Autoimmune enteropathy and diagnostic criteria Pathophysiology of autoimmune enteropathy