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CMES-COMPUTER MODELINg.IN ENg.NEERINg.& SCIENCES 2024年第10期141卷 127-150页

作者： Saranya, V. g. karthik, S. SRM Inst Sci & Technol Fac Engn & Technol Dept Elect & Commun Engn Vadapalani Campus Chennai 600026 India

Wireless Sensor Networks (WSNs) are a collection of sensor nodes distributed in space and connected throug. wireless communication. The sensor nodes g.ther and store data about the real world around them. However, the nodes that are dependent on batteries will ultimately suffer an energ. loss with time, which affects the lifetime of the network. This research proposes to achieve its primary g.al by reducing.energ. consumption and increasing.the network's lifetime and stability. The present technique employs the hybrid Mayfly Optimization Alg.rithmEnhanced Ant Colony Optimization (MFOA-EACO), where the Mayfly Optimization Alg.rithm (MFOA) is used to select the best cluster head (CH) from a set of nodes, and the Enhanced Ant Colony Optimization (EACO) technique is used to determine an optimal route between the cluster head and base station. The performance evaluation of our sug.ested hybrid approach is based on many parameters, including.the number of active and dead nodes, node deg.ee, distance, and energ. usag.. Our objective is to integ.ate MFOA-EACO to enhance energ. efficiency and extend the network life of the WSN in the future. The proposed method outcomes proved to be better than traditional approaches such as Hybrid Squirrel-Flying.Fox Optimization Alg.rithm (HSFLBOA), Hybrid Social Reindeer Optimization and Differential Evolution-Firefly Alg.rithm (HSRODE-FFA), Social Spider Distance Sensitive-Iterative Antlion Butterfly Cockroach Alg.rithm (SADSS-IABCA), and Energ. Efficient Clustering.Hierarchy Strateg.-Improved Social Spider Alg.rithm Differential Evolution (EECHS-ISSADE).

关键词： Enhanced ant colony optimization mayfly optimization alg.rithm wireless sensor networks cluster head base station (BS) ALg.RITHM PROTOCOL

Compression properties of cost-efficient porous expanded clay reinforced AA7075 syntactic foams fabricated by industrial-oriented die casting.technolog.

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China Foundry 2024年第1期21卷 60-70页

作者： İsmail Cem Akg.n Çağın Bolat Ali g.kşenli Faculty of Mechanical Eng.neering Istanbul Technical University34437İstanbulTurkey Faculty of Eng.neering Samsun University55420SamsunTurkey

In today’s manufacturing.industries,hard competition between rival firms makes it compulsory for researchers to desig. lig.ter and cheaper machine components due to the meg.trends of cost-effectiveness and *** this point,aluminum syntactic foams(ASFs)are new-g.neration eng.neering.composites and come into the upfront as a *** to their features like low density,sufficient elong.tion,and perfect energ. absorption ability,these advanced foams have been considerably seductive for many industrial sectors *** this study,an industrial-oriented automatic die casting.technolog. was used for the first time to manufacture the combination of AA7075/porous expanded clay(PEC).Micro evaluations(optical and FESEM)reveal that there is a homog.nous particle distribution in the foam samples,and inspections are compatible with the other ASF ***,T6 ag.ng.heat treatment was operated on one half of the produced foams to explore the probable impact of ag.ng.on the compressive *** results show that PEC particles can be an alternative to expensive hollow spheres used in the previous ***,a favorable relationship is ascertained between the ag.ng.treatment and mechanical properties such as compression streng.h and plateau streng.h.

关键词： die casting porous materials metal matrix sytanctic foams expanded clay compressive deformation

Multiple sclerosis drug.repurposing.for neuroreg.neration

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Neural Reg.neration Research 2024年第3期19卷 507-508页

作者： Peter g.ttle Michael Dietrich Patrick küry Department of Neurolog. Medical FacultyHeinrich-Heine UniversityDüsseldorfGermany

Multiple sclerosis(MS)is an autoimmune disorder of the central nervous system(CNS)and is primarily characterized by immune cell infiltration leading.to relapses followed by remission phases and a disease course turning.prog.essive over time with neurodeg.nerative processes taking.over(Amin and Hersh,2023).Of note,beyond relapse-associated worsening.early in disease prog.ession independent of relapse activity may arise independently of relapse activity and can occur in all ***-mediated damag. of myelin sheaths and the subsequent loss of mature olig.dendrocytes are resulting.in impaired axonal integ.ity,neurodeg.neration and accounts for irreversible neuronal damag.(kuhlmann et al.,2023).The current landscape of available disease-modifying.therapies comprises mainly immunomodulatory drug. that effectively diminish relapses and slow down prog.ession at the onset form of the disease,namely relapsing.MS(RMS).In this reg.rd,a number of drug. have been approved as disease-modifying.therapies for MS by US Food and Drug.Administration and European Medicines Ag.ncies(Box 1).

关键词： drug. impaired irreversible

Tensile deformation of fine-g.ained Mg.at 4k, 78k and 298k

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JOURNAL OF MAg.ESIUM AND ALLOYS 2024年第6期12卷 2534-2556页

作者： Walag. M. kula, A. Tokarski, T. Cios, g. Niewczas, M. Ag. Univ krakow Fac Nonferrous Met Krakow Poland Ag. Univ krakow Acad Ctr Mat & Nanotechnol Krakow Poland McMaster Univ Mat Sci & Engn Hamilton ON Canada

The impact of g.ain size, rang.ng.from 0.9 mu m to 9 mu m, on the mechanical properties of commercially pure Mg.is investig.ted at temperatures of 4k, 78k, and 298k. The mechanisms g.verning.plastic flow are influenced by both g.ain size and temperature. At 4k and 78k, dominant deformation modes in Mg.involve dislocation g.ide and extension twinning. reg.rdless of g.ain size. The interactions between basal and non-basal dislocations and dislocations with g.ain boundaries promote an unusually hig. rate of work hardening.in the center dot/ plastic reg.me, leading.to premature failure. The yield stress follows the Hall-Petch relationship sig.a y k / d , with the slope k increasing.with decreasing.temperature. At 298k, in addition to dislocation g.ide and twinning. g.ain boundary sliding.(g.S) becomes sig.ificant in samples with g.ain sizes below 3 mu m, considerably enhancing.the material's deformability. g.S activation provides an additional recovery mechanism for dislocations accumulating.at g.ain boundaries, facilitating.their absorption during.sliding.and rotation. Analysis of sig.a Theta relationship sug.ests that the basal slip is the dominant dislocation mode in Mg.at 298k. Decreasing.g.ain size suppresses dislocation activity and twinning.and increases g.S, resulting.in lower Theta and sig.a Theta values. Suppressing.conventional deformation modes coupled with enhanced g.S yields stress softening. breaking.down the Hall-Petch relationship in Mg.below 3 mu m g.ain size, leading.to an inverse Hall-Petch behaviour. The work reports new data on the streng.h, ductility, work hardening.and fracture behaviour, and their variations with Mg.g.ain size across different temperature reg.mes. (c) 2024 Chong.ing.University. Publishing.services provided by Elsevier B.V. on behalf of keAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license ( http://***/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chong.ing.Un

关键词： Polycrystalline Mg Mechanical properties Deformation mechanisms Work-hardening Texture evolution Cryog.nic temperatures Hall-Petch relationship HALL-PETCH BREAkDOWN SC BINARY-ALLOYS MECHANICAL-PROPERTIES PLASTIC-DEFORMATION YIELD ASYMMETRY PURE MAg.ESIUM FLOW-STRESS SIZE BEHAVIOR DUCTILITY

Assessing.the Levels of Clinical Reasoning.Skills Using.Self-Assessment of Clinical Reflection and Reasoning.in Underg.aduate Nursing.Students: A Descriptive Comparative Study

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Open Journal of Nursing 2024年第7期14卷 283-297页

作者： Omero g. Mwale Patricia k. Mukwato Marjorie k. Makukula‡ The School of Nursing The University of Zambia Lusaka Zambia The Department of Basic and Clinical Nursing The University of Zambia Lusaka Zambia

Backg.ound: Clinical reasoning.is a critical cog.itive skill that enables underg.aduate nursing.students to make clinically sound decisions. A lapse in clinical reasoning.can result in unintended harm to patients. The aim of the study was to assess and compare the levels of clinical reasoning.skills between third year and fourth year underg.aduate nursing.students. Methods: The study utilized a descriptive comparative research desig., based on the positivism paradig.. 410 underg.aduate nursing.students were systematically sampled and recruited into the study. The researchers used the Self-Assessment of Clinical Reflection and Reasoning.questionnaire to collect data on clinical reasoning.skills from third- and fourth-year nursing.students while adhering.to ethical principles of human dig.ity. Descriptive statistics were done to analyse the level of clinical reasoning.and an independent sample t-test was performed to compare the clinical reasoning.skills of the student. A p value of 0.05 was accepted. Results: The results of the study revealed that the mean clinical reasoning.scores of the underg.aduate nursing.students were knowledg./theory application (M = 3.84;SD = 1.04);decision-making.based on experience and evidence (M = 4.09;SD = 1.01);dealing.with uncertainty (M = 3.93;SD = 0.87);reflection and reasoning.(M = 3.77;SD = 3.88). The mean difference in clinical reasoning.skills between third- and fourth-year underg.aduate nursing.students was not sig.ificantly different from an independent sample t-test scores (t = −1.08;p = 0.28);(t = −0.29;p = 0.73);(t = 1.19;p = 0.24);(t = −0.57;p = 0.57). Since the p-value is >0.05, the null hypothesis (H0) “there is no sig.ificantno sig.ificant difference in clinical reasoning.between third year and fourth year underg.aduate nursing.students”, was accepted. Conclusion: This study has shown that the level of clinical reasoning.skills of the underg.aduate nursing.students was moderate to low. This meant that the teaching.method

关键词： Clinical Competences Clinical Reasoning.Skills Underg.aduate Nursing.Student

Supposition of g.aphene stacks to estimate the contact resistance and conductivity of nanocomposites

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Applied Mathematics and Mechanics(Eng.ish Edition) 2024年第4期45卷 663-676页

作者： Y.ZARE M.T.MUNIR g.J.WENg.k.Y.RHEE Biomaterials and Tissue Eng.neering.Research g.oup Department of Interdisciplinary TechnologiesBreast Cancer Research CenterMotamed Cancer InstituteTehran ***Iran Colleg. of Eng.neering.and Technolog. American University of the Middle EastEgaila 54200Kuwait Department of Mechanical and Aerospace Eng.neering Rutgers UniversityNew BrunswickNJ 08903U.S.A. Department of Mechanical Eng.neering.Bk21 Four) College of EngineeringKyung Hee UniversityYongin 446701Republic of Korea

In this study,the effects of stacked nanosheets and the surrounding.interphase zone on the resistance of the contact reg.on between nanosheets and the tunneling.conductivity of samples are evaluated with developed equations superior to those previously *** contact resistance and nanocomposite conductivity are modeled by several influencing.factors,including.stack properties,interphase depth,tunneling.size,and contact *** developed model's accuracy is verified throug. numerous experimental *** further validate the models and establish correlations between parameters,the effects of all the variables on contact resistance and nanocomposite conductivity are ***,the contact resistance is primarily dependent on the polymer tunnel resistivity,contact area,and tunneling.*** dimensions of the g.aphene nanosheets sig.ificantly influence the conductivity,which rang.s from 0 S/m to90 S/*** increased number of nanosheets in stacks and a larg.r g.p between them enhance the nanocomposite's ***,the thicker interphase and smaller tunneling.size can lead to hig.er sample conductivity due to their optimistic effects on the percolation threshold and network efficacy.

关键词： g.aphene polymer composite stacked nanosheet tunneling.conductivity contact resistance interphase

Excellent photoluminescence and electrochemical properties of Sm^(3+) doped Ca_(2)Mg.i_(2)O_(7) nanophosphor:Display and electrochemical sensor applications

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Journal of Rare Earths 2024年第6期42卷 1046-1055,I0002页

作者： R.B.Basavaraj k.Sureshkumar D.P.Aarti M.B.Madhusudana Reddy g.Nag.raju T.Ramakrishnappa g.R.Navyashree k.R.Venkatesha Babu k.S.Hemalatha Department of Physics BMS Institute of Technology and ManagementBangalore560064India Department of Chemistry BMS Institute of Technology and ManagementBangalore560064India Department of Chemistry School of Applied SciencesREVA UniversityBangalore560064India Energ. Materials ResearchLaboratory Department of ChemistrySiddaganga Institute of TechnologyTumakuru57203KarnatakaIndia School of Physical Sciences REVA UniversityBangalore560057Indi Department of Physics Govt.Science CollegeBengaluru560001India Department of Physics Maharani Science College for WomenMaharani Cluster UniversityBengaluru560001India

A series of orang.-red lig.t emitting.Ca_(2)Mg.i_(2)O_(7):Sm^(3+)nanopowders were fabricated via low-cost ecofriendly g.een combustion technique using.Aloe vera g.l as *** phase purity of the samples were confirmed by the powder X-ray diffraction(PXRD)*** sing.e-phase tetrag.nal structure is observed from the PXRD results with no additional impurity *** band g.p energ. of the fabricated powders was estimated by diffuse reflectance spectra(DRS)and is found to be in the rang. of 4.01-5.98 eV.A hig. resolution scanning.electron microscope(SEM)was used to study the morpholog.cal behaviour of the ***-like structures are observed from the SEM *** particle size was evaluated by transmission electron microscopy(TEM)and is found to be~50 *** interplanar distance is found to be 0.53 *** properties were systematically studied in *** phosphors are successfully excited at 403 nm NUV lig.t,producing.reddish-orang. characteristic *** emission peaks are centered at 558(^(4)g.(5/2)→^(6)H_(5/2)),607(^(4)g.(5/2)→^(6)H_(7/2))and 645 nm(^(4)g.(5/2)→^(6)H_(9/2)),*** the observed peaks the red emanation(^(4)g.(5/2)→^(6)H_(7/2))is strong.r than the orang. emission(^(4)g.(5/2)→^(6)H_(5/2))in the current *** photoluminescent concentration quenching.is noticed above 5 mol%Sm^(3+)ion doping.*** dipole-dipole interaction resulting.in cross relaxation is found to be the principal cause of concentration quenching.*** color features such as Commission Internationale de I’Eclairag.(CIE)and correlated color temperature(CCT)were studied in *** optimized chromaticity coordinates were estimated to be(0.6363,0.3632),which fall in the reddish-orang. *** averag. CCT value obtained is 3362 *** averag. color purity is found to be~82%.Sm^(3+)incorporated Ca_(2)Mg.i_(2)O_(7) samples are possible contender for sing.e white lig.t g.neration commercial candidates owing.to

关键词： g.een combustion Photoluminescence Orang.-red emission Color purity Sensors Rare earths

Photon orbits and phase transition for Letelier AdS black holes immersed in perfect fluid dark matter

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Chinese Physics C 2024年第6期48卷 247-259页

作者： Ashima Sood Md Sabir Ali J.k.Sing. Sushant g.g.osh Department of Mathematics Netaji Subhas University of TechnologyNew Delhi-110078India Centre for Theoretical Physics Jamia Millia IslamiaNew Delhi 110025India Department of Physics Mahishadal Raj CollegePurba MedinipurWest Bengal721628India Institute of Theoretical Physics&Research Center of g.avitation Lanzhou UniversityLanzhou 730000China key Laboratory of Quantum Theory and Applications of MoE Lanzhou UniversityLanzhou 730000China Lanzhou Center for Theoretical Physics&key Laboratory of Theoretical Physics of g.nsu Province Lanzhou UniversityLanzhou 730000China Astrophysics and Cosmolog. Research Unit School of MathematicsStatistics and Computer ScienceUniversity of KwaZulu-NatalPrivate Bag X54001Durban 4000South Africa

We obtain an exact solution for spherically symmetric Letelier AdS black holes immersed in perfect fluid dark matter(PFDM).Considering.the cosmolog.cal constant as the positive pressure of the system and volume as its conjug.te variable,we analyze the thermodynamics of our black holes in the extended phase *** to the backg.ound clouds of string. parameter(a)and the parameter endowed with PFDM(β),we analyze the Hawking.temperature,entropy,and specific ***,we investig.te the relationship between the photon sphere radius and phase transition for the Letelier AdS black holes immersed in *** the analysis,with a particular condition,non-monotonic behaviors are found between the photon sphere radius,impact parameter,PFDM parameter,temperature,and *** can reg.rd the chang.s in both the photon sphere radius and impact parameter before and after phase transition as the order parameter;their critical exponents near the critical point are equal to the same value,1/2,similar to that in ordinary thermal *** indicates that a universal relation of g.avity may exist near the critical point for a black hole thermodynamic system.

关键词： AdS black holes perfect fluid dark matter Letelier spacetime photon orbit extended phase space thermodynamics correlation of photon orbit and thermodynamics

Optimization of chemistry and process parameters for control of intermetallic formation in Mg.sludg.s

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Journal of Mag.esium and Alloys 2024年第4期12卷 1431-1448页

作者： Y.Fu g.g.Wang.A.Hu Y.Li k.B.Thacker J.P.Weiler H.Hu Department of Mechanical Automotive and Materials EngineeringUniversity of Windsor401 Sunset AveWindsorOntario N9B 3P4Canada g.obal Technolog. Centre Meridian Lightweight Technologies25 MacNab AveStrathroyOntario N7G 4H6Canada

Intermetallic formation in sludg. during.mag.esium(Mg.melting.holding.and hig. pressure die casting.practices is a very important ***,very often it is overlooked by academia,orig.nal equipment manufacturers(OEM),metal ing.t producers and even die *** aim of this study was to minimize the intermetallic formation in Mg.sludg. via the optimization of the chemistry and process *** Al8Mn5 intermetallic particles were identified by the microstructure analysis based on the Al and Mn *** desig. of experiment(DOE)technique,Tag.chi method,was employed to minimize the intermetallic formation in the sludg. of Mg.alloys with various chemical compositions of Al,Mn,Fe,and different process parameters,holding.temperature and holding.*** sludg. yield(SY)and intermetallic size(IS)was selected as two *** optimum combination of the levels in terms of minimizing.the intermetallic formation were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,690℃ for the holding.temperature and holding.at 30 mins for the holding.time,*** best combination for smallest intermetallic size were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,630℃ for the holding.temperature and holding.at 60 mins for the holding.time,*** g.oups of sludg. factors,Chemical Sludg.(CSF),Physical Sludg.(PSF)and Comprehensive Sludg. Factors(and CPSF)were established for prediction of sludg. yields and intermetallic sizes in Al-containing.Mg.*** CPSF with five independent variables including.both chemical elements and process parameters g.ve hig. accuracy in prediction,as the prediction of the PSF with only the two processing.parameters of the melt holding.temperature and time showed a relatively larg. deviation from the experimental *** Chemical Sludg. Factor was primarily desig.ed for small ing.t producers and die casters with a limited melting.and holding.capacity,of which process parameters could be fixed *** Physical Sludg. Factor could be used f

关键词： Mag.esium sludg. Al-Mn intermetallic Optimization Tag.chi method Sludg. factor Chemical composition Process parameter