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regression analysis of squeezing-induced hybrid nanofluid flow in Darcy-Forchheimer porous medium

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Applied mathematics and mechanics(English Edition) 2025年第1期46卷 193-208页

作者： k.mUHAmmAD m.SArFrAZ Depar.m.nt of Humanities and Sciences School of Electrical Engineering and Computer Science National University of Sciences and Technology Depar.m.nt of mathematics Quaid-i-Azam University

This article presents a mathematical model addressing a scenario involving a hybrid nanofluid flow between two infinite parallel plates. One plate r.m.ins stationary, while the other.m.ves downward at a squeezing velocity. The space between these plates contains a Darcy-Forchheimer porous medium. A mixture of water-based fluid with gold(Au) and silicon dioxide(Si O2) nanoparticles is formulated. In contrast to the conventional Fourier's heat flux equation, this study employs the Cattaneo-Christov heat flux equation. A uniform magnetic field is applied perpendicular to the flow direction, invoking magnetohydrodynamic(mHD) effects. Further, the model accounts for Joule heating, which is the heat generated when an electric current passes through the fluid. The problem is solved via NDSolve in mATHEmATICA. Numerical and statistical analyses are conducted to provide insights into the behavior of the nanomaterials between the parallel plates with respect to the flow, energy transport, and skin *** findings of this study have potential applications in enhancing cooling systems and optimizing thermal management strategies. It is observed that the squeezing motion generates additional pressure gradients within the fluid, which enhances the flow rate but reduces the frictional drag. Consequently, the fluid is pushed more vigorously between the plates, increasing the flow velocity. As the fluid experiences higher flow rates due to the increased squeezing effect, it spends less time in the region between the plates. The thermal relaxation, however, abruptly changes the temperature, leading to a decrease in the temperature fluctuations.

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Nuclear radiation shielding effectiveness and corrosion behavior of some steel alloys for nuclear reactor systems

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Defence Technology（防务技术） 2019年第4期15卷 621-628页

作者： m.m. Sadawy r.m. El Shazly mining and Petroleum Engineering Depar.m.nt Al-Azhar University Nasr City Cairo 11371 Egypt Physics Depar.m.nt Faculty of Science Al-Azhar University Nasr City Cairo 11884 Egypt

Different types of nuclear par.m.ters and corrosion behavior were deduced for carbon steel(AISI 1018),austenitic(304 SS),and duplex(2507 SS)stainless steel *** types of neutron energies as well as nine gamma ray energy lines(121.78-1407.92 keV)were used to evaluate the macroscopic neutron cross-sections(∑,cm^-1)and mass attenuation coefficients[σ,cm^2·g^-1)of gamma ray *** corrosion behavior was investigated using different electrochemical *** results showed that the stainless-steel alloys had a good attitude than that of carbon steel alloy for neutron and gamma ray par.m.ters,especially the duplex stainless *** calculated values of mass attenuation coefficient using WinXcom computer progr.m.Version 3.1),exhibited a very good agreement with the exper.m.ntal values of that ***,the results indicated that duplex stainless-steel exhibited corrosion resistance higher than 304 SS and AISI 1018 steel alloys.

关键词： Steel alloys macroscopic cross-section mass attenuation coefficient Passive film Pitting

EXACT EVALUATIONS OF FINITE TrIGONOmETrIC SUmS BY SAmPLING THEOr.m.

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Acta mathematica Scientia 2011年第2期31卷 408-418页

作者： m.H. Annaby r.m. Asharabi Depar.m.nt of mathematics Faculty of Science Cairo University Depar.m.nt of mathematics Faculty of Education Al-MahweetSana'a University

We use the sampling representations associated with Sturm-Liouville difference operators to derive generalized integral-valued trigonometric sums. This extends the known results where zeros of Chebyshev polynomials of the first kind are involved to the use of the eigenvalues of difference operators, which leads to new identities. In these identities Bernoulli＇s numbers play a role similar to that of Euler＇s in the old ones. Our technique differs fr.m.that of Byrne-Smith （1997） and Berndt-Yeap （2002）.

关键词： Trigonometric sums difference equations sampling theorem

GIS-based analysis of fault patterns in urban areas： A case study of Irkutsk city, russia

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Geoscience Frontiers 2016年第2期7卷 287-294页

作者： r.m. Lobatskaya I.P. Strelchenko Irkutsk research Technological University Irkutsk Russia

The capabilities of GIS in modeling fault patterns are explored for Irkutsk city in East Siberia with implications for ground stability. The neotectonic structure of the area is visualized in three dimension （3D） taking into account fault dips, using the ArcGIS, Globalmapper and Paradigm Geophysical packages. The study area is divided into blocks of different size classes according to the length-based ranks of the bounding faults, which are of five classes distinguished with the equal interval method. The blocks show different deformation patterns, with different densities and strikes of crossing and bounding faults. The data are statistically processed using GIS to estimate the deformation degrees of blocks in arbitrary units per square kilometer using the attributes of rank and crossing/bounding position of faults and the size of blocks. The deformation degrees are then compared with available estimates of ground stability measured as a score of points corresponding to destabilizing factors. Although the comparison generally confirms some linkage between the deformation degree of blocks and their ground stability, the correlation is intricate and ambiguous. In order to enhance the advantages of GIS in building and analyzing 3D models of fault patterns for estimating ground stability and mitigating geological hazards, it is expected in the future to proceed fr.m.the reported initial step of visualization to more advanced analysis.

关键词： GIS 3D modeling Fault pattern Faults Blocks Ground stability

Heterogeneity of mature oligodendrocytes in the central nervous system

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Neural regeneration research 2025年第5期20卷 1336-1349页

作者： Chao Weng Adam m.r.Groh moein Yaqubi Qiao-Ling Cui Jo Anne Stratton G.r.Wayne moore Jack P.Antel Neuroimmunology Unit Montreal Neurological Institute-HospitalDepartment of Neurology and NeurosurgeryMcGill UniversityMontrealQCCanada Depar.m.nt of Neurology Renmin Hospital of Wuhan UniversityWuhanHubei ProvinceChina

mature oligodendrocytes form myelin sheaths that are crucial for the insulation of axons and efficient signal transmission in the central nervous *** evidence has challenged the classical view of the functionally static mature oligodendrocyte and revealed a gamut of dynamic functions such as the ability to modulate neuronal circuitry and provide metabolic support to *** the recognition of potential heterogeneity in mature oligodendrocyte function,a comprehensive summary of mature oligodendrocyte diversity is *** delve into early 20th-century studies by robertson and río-Hortega that laid the foundation for the modern identification of regional and morphological heterogeneity in mature ***,recent morphologic and functional studies call into question the long-assumed homogeneity of mature oligodendrocyte function through the identification of distinct subtypes with varying myelination ***,modern molecular investigations,employing techniques such as single cell/nucleus rNA sequencing,consistently unveil at least six mature oligodendrocyte subpopulations in the human central nervous system that are highly transcriptomically diverse and vary with central nervous system *** and disease related mature oligodendrocyte variation denotes the impact of pathological conditions such as multiple sclerosis,Alzheimer's disease,and psychiatric ***,caution is warranted when subclassifying mature oligodendrocytes because of the simplification needed to make conclusions about cell identity fr.m.temporally confined *** studies leveraging advanced techniques like spatial transcriptomics and single-cell proteomics pr.m.se a more nuanced understanding of mature oligodendrocyte *** research avenues that precisely evaluate mature oligodendrocyte heterogeneity with care to understand the mitigating influence of species,sex,central nervous system region,age,and disease,

关键词： aging central nervous system diseases electron microscopy heterogeneity immunohistochemistry myelin sheath natural history neuroglia oligodendroglia single-cell gene expression analysis

Preparation, Characterization, Biological Activity and 3D molecular.m.deling of mn（Ⅱ）, Co（Ⅱ）, Ni（Ⅱ）, Cu（Ⅱ）, Pd（Ⅱ） and ru（Ⅲ） Complexes of Some Sulfadrug Schiff Bases

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Chinese Journal of Chemistry 2012年第4期30卷 881-890页

作者： EL-Ghamry,H.A. Sakai,k. masaoka,S. EI-Baradie,k.Y Issa,r.m. Chemistry Depar.m.nt Faculty of ScienceTanta UniversityTantaEgypt Chemistry Depar.m.nt Faculty of ScienceKyushu UniversityFukuokaJapan Institute for.m.lecular Science National Institutes of Natural SciencesJapan

mn（Ⅱ）, Co（Ⅱ）, Ni（Ⅱ）, Cu（Ⅱ）, Pd（Ⅱ） and ru（Ⅲ） complexes of Schiff bases derived fr.m.the condensation of sulfaguanidine with 2,4-dihydroxy benzaldehyde （HL1）, 2-hydroxy-l-naphthaldehyde （HL2） and salicylaldehyde （HL3） have been synthesized. The structures of the prepared metal complexes were proposed based on elemental analysis, molar conductance, thermal analysis （TGA, DSC and DTG）, magnetic susceptibility measur.m.nts and spectroscopic techniques （Ir, UV-Vis, and ESr）. In all complexes, the ligand bonds to the metal ion through the azomethine nitrogen and a-hydroxy oxygen atoms. The structures of Pd（Ⅱ） complex 8 and ru（Ⅲ） complex 9 were found to be polynuclear. Two kinds of stereochemical geometries; distorted tetrahedral and distorted square py- r.m.dal, have been realized for the Cu（Ⅱ） complexes based on the results of UV-Vis, magnetic susceptibility and ESr spectra whereas octahedral geometry was predicted for Co（Ⅱ）, mn（Ⅱ） and ru（Ⅲ） complexes. Ni（Ⅱ） com- plexes were predicted to be square planar and tetrahedral and Pd（Ⅱ） complexes were found to be square planar. The antimicrobial activity of the ligands and their.m.tal complexes was also investigated against the gr.m.positive bac- teria Staphylococcus aures and Bacillus subtilis and gr.m.negative bacteria, Escherichia coli and Pesudomonas aeruginosa, by using the agar dilution method. Chlor.m.henicol was used as standard compound. The obtained data revealed that the metal complexes are more or less, active than the parent ligand and standard. The X-ray crys- tal structure of HL3 has been also reported.

关键词： sulfaguanidine transition metal complexes spectral studies biological activity crystal structure mo- lecular.m.deling

marking rNA:m^6A writers,readers,and functions in Arabidopsis

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Journal of molecular Cell Biology 2019年第10期11卷 899-910页

作者： marlene reichel Tino koster Dorothee Staiger rNA Biology and molecular Physiology Faculty of BiologyBielefeld University33615 BielefeldGermany

N^6-methyladenosine(m^6A)emerges as an important modification in eukaryotic mrNAs.m^6A has first been reported in 1974,and its functional significance in mammalian gene regulation and importance for proper development have been well *** arsenal of writer,eraser,and reader proteins accomplish deposition,r.m.val,and interpretation of the m^6A mark,resulting in dynamic *** led to the concept of an epitranscriptome,the compendium of rNA species with chemical modification ofthe nucleobases in the cell,in analogy to the *** m^6A has long been known to also exist in plant mrNAs,proteins involved in m^6A metabolism have only recently been detected by mutant analysis,homology search,and mrNA interactome capture in the reference plant Arabidopsis *** ofthe m^6A modification causes severe developmental abnormalities of leaves and roots and altered timing of reproductive ***,m^6A modification affects viral ***,we discuss recent progress in identifying m^6A sites transcriptome-wide,in identifying the molecular players involved in writing,r.m.ving,and reading the mark,and in assigning functions to this rNA modification in *** highlight similarities and differences to m^6A modification in mammals and provide an outlook on important questions that r.m.in to be addressed.

关键词： Arabidopsis m^6A mrNA interactome posttranscriptional rNA-binding protein

Guava extract (Psidium guajava) alters the labelling of blood constituents with technetium-99m

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2006年第6期7卷 429-435页

作者： ABrEU P.r.C. ALmEIDA m.C. BErNArDO r.m. BErNArDO L.C. BrITO L.C. GArCIA E.A.C. FONSECA A.S. BErNArDO-FILHO m. Depar.m.nt of Biophysics and Biometry Institute of Biology Roberto Alcantara Gomes University of Estate of Rio de Janeiro Rio de Janeiro 20551030 Brazil Depar.m.nt of Physiology Biological Sciences and Health Center Federal University of Sergipe So Cristóvo Sergipe 49100000 Brazil Depar.m.nt of Pharmacology and Psychobiology Institute of Biology Roberto Alcantara Gomes University of Estate of Rio de Janeiro Rio de Janeiro 20551030 Brazil

Psidium guajava (guava) leaf is a phytotherapic used in folk medicine to treat gastrointestinal and respiratory dis-turbances and is used as anti-inflammatory medicine. In nuclear.m.dicine, blood constituents (BC) are labelled with techne-tium-99m (99mTc) and used to image procedures. However, data have demonstrated that synthetic or natural drugs could modify the labelling of BC with 99mTc. The aim of this work was to evaluate the effects of aqueous extract of guava leaves on the labelling of BC with 99mTc. Blood samples of Wistar rats were incubated with different concentrations of guava extract and labelled with 99mTc after the percentage of incorporated radioactivity (%ATI) in BC was determined. The results suggest that aqueous guava extract could present antioxidant action and/or alters the membrane structures involved in ion transport into cells, thus decreasing the radiolabelling of BC with 99mTc. The data showed significant (Pration of ATI in BC fr.m.blood incubated with guava extract.

关键词： Antioxidant Blood constituents Psidium guajava Technetium-99m

Getting physical with medical education:Exercise based virtual anatomy review classes for.m.dical students

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World Journal of methodology 2025年第1期15卷 20-25页

作者： Nadeesha r Samarasinghe Taniya S Nagpal michele L Barbeau Charys m martin Division of General Surgery Faculty of MedicineUniversity of British ColumbiaVancouver V6T 1Z3BCCanada Faculty of kinesiology Sport and RecreationUniversity of AlbertaEdmonton T6G 2R3ABCanada Anatomy and Cell Biology University of Western OntarioLondon N6A 3K7ONCanada Depar.m.nt of Anatomy and Cell Biology Schulich School of Medicine and DentistryThe University of Western OntarioLondon N6A 3K7ONCanada

The benefits of regular physical activity are well ***,few studies have examined the effectiveness of integrating physical activity(PA)into curricula within a post-secondary *** investigate the incorporation of PA into medical curriculum,we developed a series of optional exercise-based review sessions designed to reinforce musculoskeletal(mSk)anatomy course *** synchronous sessions were co-taught by a group fitness instructor and an anatomy *** fitness instructor would lead students through both strength and yoga style exercises,while the anatomy instructor asked questions about relevant anatomical structures related to course material previously *** the sessions,participants were asked to evaluate the classes on their self-reported exam preparedness in improving mSk anatomy knowledge,PA levels,and mental *** participants completed surveys;a majority agreed that the classes increased understanding of mSk concepts(90.0%)and activity levels(97.7%).many(70.0%)felt that the classes helped reduce *** majority of respondents(90.0%)agreed that the classes contributed to increased feelings of social ***,medical students saw benefit in PA based interventions to supplement mSk course *** with increasing activity levels and pr.m.ting health behaviours,integrating PA into medical curriculum may improve comprehension of learning material,alleviate stress and foster social connectivity among medical students.

关键词： medical education musculoskeletal Anatomy Exercise Online learning