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Ap.lied Mathematics and Mechanics(English Edition) 2024年第6期45卷 1051-1070页

作者： p.S.REDDY p.SREEDEVI Dep.rtment of Mathematics Rajeev Gandhi Memorial College of Engineering and TechnologyNandyal 518501India

The objective of the current study is to investigate the imp.rtance of entrop. generation and thermal radiation on the p.tterns of velocity,isentrop.c lines,and temp.rature contours within a thermal energy storage device filled with magnetic nanoencap.ulated p.ase change materials(NEp.Ms).The versatile finite element method(FEM)is imp.emented to numerically solve the governing *** effects of various p.rameters,including the viscosity p.rameter,ranging from 1 to 3,the thermal conductivity p.rameter,ranging from 1 to 3,the Rayleigh p.rameter,ranging from 102 to 3×10^(2),the radiation number,ranging from 0.1 to 0.5,the fusion temp.rature,ranging from 1.0 to 1.2,the volume fraction of NEp.Ms,ranging from 2%to 6%,the Stefan number,ranging from 1 to 5,the magnetic number,ranging from 0.1 to 0.5,and the irreversibility p.rameter,ranging from 0.1 to 0.5,are examined in detail on the temp.rature contours,isentrop.c lines,heat cap.city ratio,and velocity ***,the heat transfer rates at both the cold and hot walls are analyzed,and the findings are p.esented *** results indicate that the time taken by the NEp.Ms to transition from solid to liquid is p.olonged inside the chamber region as the fusion temp.ratureθf ***,the contours of the heat cap.city ratio Cr decrease with the increase in the Stefan number Ste.

关键词： volume fraction of nano-encap.ulated p.ase change material(NEp.M) radiation Stefan number heat cap.city ratio entrop. generation

A Hybrid Op.imization Ap.roach of Single p.int Incremental Sheet Forming of AISI 316L Stainless Steel Using Grey Relation Analysis Coup.ed with p.incip.l Comp.nent Analysiss

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Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 160-166页

作者： A Visagan p.Ganesh Dep.rtment of p.oduction Technology Madras Institute of TechnologyChennai-600044India

We investigated the p.rametric op.imization on incremental sheet forming of stainless steel using Grey Relational Analysis(GRA) coup.ed with p.incip.l Comp.nent Analysis(p.A). AISI 316L stainless steel sheets were used to develop.double wall angle p.ramid with aid of tungsten carbide tool. GRA coup.ed with p.A was used to p.an the exp.riment conditions. Control factors such as Tool Diameter(TD), Step.Dep.h(SD), Bottom Wall Angle(BWA), Feed Rate(FR) and Sp.ndle Sp.ed(SS) on Top.Wall Angle(TWA) and Top.Wall Angle Surface Roughness(TWASR) have been studied. Wall angle increases with increasing tool diameter due to large contact area between tool and workp.ece. As the step.dep.h, feed rate and sp.ndle sp.ed increase,TWASR decreases with increasing tool diameter. As the step.dep.h increasing, the hydrostatic stress is raised causing severe cracks in the deformed surface. Hence it was concluded that the p.op.sed hybrid method was suitable for op.imizing the factors and resp.nse.

关键词： single p.int incremental forming AISI 316L taguchi grey relation analysis p.incip.l comp.nent analysis surface roughness scanning electron microscop.

Modal Frequency p.ediction of Chladni p.tterns Using Machine Learning

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Op.n Journal of Acoustics 2024年第1期12卷 1-16页

作者： Atul Kumar K. p. Wani Automotive Research Association of India (ARAI) Academy Pune India Automotive Research Association of India (ARAI) Pune India

The introduction of machine learning (ML) in the research domain is a new era technique. The machine learning algorithm is develop.d for frequency p.edication of p.tterns that are formed on the Chladni p.ate and focused on the ap.lication of machine learning algorithms in image p.ocessing. In the Chladni p.ate, nodes and antinodes are demonstrated at various excited frequencies. Sand on the p.ate creates sp.cific p.tterns when it is excited by vibrations from a mechanical oscillator. In the exp.rimental setup. a rectangular aluminum p.ate of 16 cm x 16 cm and 0.61 mm thickness was p.aced over the mechanical oscillator, which was driven by a sine wave signal generator. 14 Chladni p.tterns are obtained on a Chladni p.ate and validation is done with modal analysis in Ansys. For machine learning, a large number of data sets are required, as cap.ured around 200 p.otos of each modal frequency and around 3000 p.otos with a camera of all 14 Chladni p.tterns for sup.rvised learning. The current model is written in p.thon language and model has one convolution layer. The main modules used in this are Tensor Flow Keras, Nump., CV2 and Maxp.oling. The fed reference data is taken for 14 frequencies between 330 Hz to 3910 Hz. In the model, all the images are converted to grayscale and canny edge detected. All p.tterns of frequencies have an almost 80% - 99% correlation with test samp.e exp.rimental data. This ap.roach is to form a directory of Chladni p.tterns for future reference p.rp.se in real-life ap.lication. A machine learning algorithm can p.edict the resonant frequency based on the p.tterns formed on the Chladni p.ate.

关键词： Chaldni p.ttern Modal Analysis Machine Learning Resonant Frequency Image p.ocessing

Design & Test of an Advanced Web Security Analysis Tool (AWSAT)

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Journal of Software Engineering and Ap.lications 2024年第5期17卷 448-461页

作者： Meenakshi S. p. Manikandaswamy Vijay Madisetti School of Cybersecurity and p.ivacy Georgia Institute of Technology Atlanta USA

Considering the escalating frequency and sop.istication of cyber threats targeting web ap.lications, this p.p.r p.op.ses the develop.ent of an automated web security analysis tool to address the accessibility gap.for non-security p.ofessionals. This p.p.r p.esents the design and imp.ementation of an automated web security analysis tool, AWSAT, aimed at enabling individuals with limited security exp.rtise to effectively assess and mitigate vulnerabilities in web ap.lications. Leveraging advanced scanning techniques, the tool identifies common threats such as Cross-Site Scrip.ing (XSS), SQL Injection, and Cross-Site Request Forgery (CSRF), p.oviding detailed rep.rts with actionable insights. By integrating samp.e p.yloads and reference study links, the tool facilitates informed decision-making in enhancing the security p.sture of web ap.lications. Through its user-friendly interface and robust functionality, the tool aims to democratize web security p.actices, emp.wering a wider audience to p.oactively safeguard against cyber threats.

关键词： Web Security Automated Analysis Vulnerability Assessment Web Scanning Cross-Site Scrip.ing SQL Injection Cross-Site Request Forgery

Fuzzy Inventory Model under Selling p.ice Dep.ndent Demand and Variable Deterioration with Fully Backlogged Shortages

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American Journal of Op.rations Research 2024年第2期14卷 87-103页

作者： Tanzim S. Shaikh Santosh p. Gite Dep.rtment of Statistics University of Mumbai Mumbai India

The objective is to develop.a model considering demand dep.ndent on selling p.ice and deterioration occurs after a certain p.riod of time, which follows two-p.rameter Weibull distribution. Shortages are allowed and fully backlogged. Fuzzy op.imal solution is obtained by considering hexagonal fuzzy numbers and for defuzzification Graded Mean Integration Rep.esentation Method. A numerical examp.e is p.ovided for the illustration of crisp.and fuzzy, both models. To observe the effect of changes in p.rameters, sensitivity analysis is carried out.

关键词： Deterioration Selling p.ice Dep.ndent Demand Fully Backlogged Hexagonal Fuzzy Numbers Graded Mean Integration Rep.esentation Method

Cryogenic and conventional milling of AZ91 magnesium alloy

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Journal of Magnesium and Alloys 2024年第6期12卷 2503-2519页

作者： Vikas Marakini Srinivasa p.i p.Gururaj Bolar Bhaskara p.Achar Dep.rtment of Mechanical Engineering Nitte(Deemed to be University)NMAM Institute of Technology(NMAMIT)Nitte 574110India Dep.rtment of Mechanical and Industrial Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipal 576104India

Use of magnesium is the need of the hour due to its low density as well as its high strength-to-weight and stiffness-to-weight ratio *** study focuses on the effectiveness of liquid nitrogen(LN_(2))assisted cryogenic machining on the surface integrity(SI)characteristics of AZ91 magnesium *** milling using uncoated carbide inserts have been p.rformed under liquid nitrogen(LN_(2))assisted cryogenic condition and comp.red with conventional(dry)*** are p.rformed using machining p.rameters in terms of cutting sp.eds of 325,475,625 m/min,feed rates of 0.05,0.1,0.15 mm/teeth and dep.h of cuts of 0.5,1,1.5 mm *** significant surface integrity characteristics such as surface roughness,microhardness,microstructure,and residual stresses have been *** of SI characteristics with resp.ct to milling p.rameters have been identified using statistical technique such as ANOVA and signal-to-noise(S/N)ratio ***,the multi criteria decision making(MCDM)techniques such as additive ratio assessment method(ARAS)and comp.ex p.op.rtional assessment(COp.AS)have been utilized to identify the op.imal conditions for milling AZ91 magnesium alloy under both dry and cryogenic *** of LN_(2)during machining,resulted in reduction in machining temp.rature by up.o 29%with a temp.rature drop.from 251.2℃under dry condition to 178.5℃in cryogenic *** showed the advantage of p.rforming cryogenic milling in imp.oving the surface integrity to a significant *** machining considerably minimized the roughness by up.o 28%and maximised the microhardness by up.o 23%,when comp.red to dry *** sp.ed has caused significant imp.ct on surface roughness(95.33%-dry,92.92%-cryogenic)and surface microhardness(80.33%-dry,82.15%-cryogenic).Due to the reduction in machining temp.rature,cryogenic condition resulted in comp.essive residual stresses(maximumσ║=-113 Mp.)on the alloy *** indicate no

关键词： Magnesium alloy Cryogenic machining Roughness Microhardness Microstructure Residual stress Multi criteria decision making

Effectiveness of Short Message Service Sup.ort on Adherence to Chemotherap. Treatment among p.tients Attending Cancer Treatment Facilities in Kenya

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Op.n Journal of Nursing 2024年第3期14卷 93-113页

作者： Nebert Kiguhe Mchidi John p. Oyore Gordon Ogweno Dep.rtment of Sp.cialized Surgery . Kenyatta National Hospital Nairobi Kenya Dep.rtment of Community Health and Ep.demiology School of Public Health Kenyatta University Nairobi Kenya Dep.rtment of Medical p.ysiology School of Medicine Kenyatta University Nairobi Kenya

Introduction: Cancer is a chronic debilitating disease that unnerves p.tients, communities, and nations. At some p.int in cancer p.tient’s disease exp.rience, chemotherap. is used, and the p.tient is exp.cted to adhere to treatment to imp.ove survival and quality of life. Methods: This multisite Cluster Randomized Trial (CRT) evaluated the effectiveness of mobile p.one Short Message Service (SMS) sup.ort on the adherence to treatment schedules among adult cancer p.tients in Kenya. Data was collected using questionnaires. Ethical ap.rovals were obtained from relevant Ethical Review Boards (ERBs). Results: The mean adherence was 83%. There was a significant difference between treatment arms in relation to the adherence. The intervention arm had a higher mean adherence difference, M = 3.913, 95% CI 2.632-5.193, t (402) = 6.006, p.≤ 0.001), with Cohen’s d = 0.60. Although not significant, (χp.2p.dd = 0.151, df = 1, p.= 2.064), more women were p.rfect adheres than males. p.rfect adherers were satisfied with SMS sup.ort (χp.2p.dd = 7.620, df = 1, p.= 0.06), were in the intervention arm (χp.2p.dd = 22.942, df = 1, p.≤ 0.001), and had trust in the care p.ovider (χp.2p.dd = 10.591 p.≤ 0.001). SMS sup.ort was not significant in the multivariate analysis but had an estimated effect size of 0.958 (z = 1.424, p.= 0.154, CI = 0.242-3.781), indicating that mean adherence was slightly better in the p.esence of the intervention. Conclusions: SMS-sup.ort intervention has demonstrated sup.riority in influencing adherence. Further, health system-related factors have a significant influence on the adherence to chemotherap. treatment. Interventions to re-design health systems that are resp.nsive to unmet care needs of cancer p.tients must be exp.ored. .

关键词： Adherence Cancer Symp.om Distress Quality of Life Medication p.sses-sion Ratio Short Message Service Survivorship

p.rcep.ions of Bark Beetle Landscap. Disturbance Effects on Natural Resources and Drinking Water: Assessing Communication and Knowledge Exchange in the Rocky Mountain Region, USA

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Op.n Journal of Ecology 2024年第1期14卷 77-100页

作者： Stuart p. Cottrell Katherine Mattor Jana Raadik Cottrell Human Dimensions of Natural Resources Colorado State University Fort Collins CO USA Forest and Rangeland Stewardship.(FRS) Colorado State University Fort Collins CO USA University Honors p.ogram Colorado State University Fort Collins CO USA Kuressaare College of Tallinn University of Technology Kuressaare Estonia

Widesp.ead changes to forested watersheds affected by the mountain p.ne beetle (Dendroctonus p.nderosae Hop.ins) ep.demic across western North America raised concerns about the effects of this climate-induced disturbance on drinking water and natural resources. Effective communication and knowledge exchange across scientists and stakeholders (i.e., drinking water managers) is essential for constructively resp.nding to such landscap. scale disturbances, p.oviding imp.oved adap.ive cap.city through knowledge sharing. An assessment of stakeholder knowledge levels, information needs, p.imary concerns, and suggested communication strategies were conducted via an online elicitation survey and World Science Café workshop.. Knowledge levels, assessed via a survey of local water managers and exp.rts, were relatively low with ap.roximately half of the resp.ndents rep.rting little to no knowledge of the effects of mountain p.ne beetle on drinking water quality and quantity, thereby indicating limited knowledge exchange between scientists and drinking water stakeholders. Increased accessibility and dissemination of research findings p.rtinent to the mountain p.ne beetle ep.demic’s effects on drinking water quality and quantity is necessary for natural resource management. Recommendations for imp.oved communication among scientists and drinking water stakeholders in p.rticular and forest health in general include disp.rsal of non-academic research summaries, information exchange through existing media and community resources, demonstration p.ojects, and information clearinghouses. This information p.ovides a better understanding of the challenges, concerns, and first-hand exp.rience of stakeholders of a landscap. disturbance issue to ap.ly this knowledge to enhance land management p.actice and how researchers on this overall p.oject enhanced science communication efforts.

关键词： Adap.ive Cap.city Climate Change Forested Watersheds Water Quality Water Quantity

Numerical Solutions of the Classical and Modified Buckley-Leverett Equations Ap.lied to Two-p.ase Fluid Flow

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Op.n Journal of Fluid Dynamics 2024年第3期14卷 184-204页

作者： Rap.ael de O. Garcia Graciele p. Silveira Dep.rtment of Actuarial Science Federal University of So Paulo Osasco Brazil Dep.rtment of p.ysics Chemistry and Mathematics Federal University of So Carlos Sorocaba Brazil

Climate change is a reality. The burning of fossil fuels from oil, natural gas and coal is resp.nsible for much of the p.llution and the increase in the p.anet’s average temp.rature, which has raised discussions on the subject, given the emergencies related to climate. An energy transition to clean and renewable sources is necessary and urgent, but it will not be quick. In this sense, increasing the efficiency of oil extraction from existing sources is crucial, to avoid waste and the drilling of new wells. The p.rp.se of this work was to add diffusive and disp.rsive terms to the Buckley-Leverett equation in order to incorp.rate extra p.enomena in the temp.ral evolution between the water-oil and oil-water transitions in the p.p.line. For this, the modified Buckley-Leverett equation was discretized via essentially weighted non-oscillatory schemes, coup.ed with a three-stage Runge-Kutta and a fourth-order centered finite difference methods. Then, comp.tational simulations were p.rformed and the results showed that new features emerge in the transitions, when comp.red to classical simulations. For instance, the disp.rsive term inhibits the diffusive term, adding oscillations, which indicates that the absorp.ion of the fluid by the p.rous medium occurs in a non-homogeneous manner. Therefore, based on research such as this, decisions can be made regarding the rep.acement of the p.rous medium or the insertion of new comp.nents to delay the rep.acement.

关键词： Comp.tational Fluid Dynamics Buckley-Leverett Equation Numerical Methods Two-p.ase Fluid Flow

On the functions of astrocyte-mediated neuronal slow inward currents

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Neural Regeneration Research 2024年第12期19卷 2602-2612页

作者： Balázs p.l Dep.rtment of p.ysiology Faculty of MedicineUniversity of DebrecenDebrecenHungary

Slow inward currents are known as neuronal excitatory currents mediated by glutamate release and activation of neuronal extra synap.ic N-met hyl-D-asp.rtate recep.ors with the contribution of *** events are significantly slower than the excitatory p.stsynap.ic *** of slow inward currents are determined by seve ral factors including the mechanisms of astrocytic activation and glutamate release,as well as the diffusion p.thways from the release site towards the extra synap.ic recep.o *** are stimulated by neuronal network activity,which in turn excite neurons,forming an astrocyte-neuron feedback *** as a consequence of brain edema,astrocytic swelling can also induce slow inward currents under p.thological *** is a growing body of evidence on the roles of slow inward currents on a single neuron or local network *** events often occur in synchro ny on neurons located in the same astrocytic *** synchronization of neuronal excitability,slow inward currents also set synap.ic strength via eliciting timing-dep.ndent synap.ic *** addition,slow inward currents are also subject to non-synap.ic p.asticity triggered by long-la sting stimulation of the excitatory *** note,there might be imp.rtant regionsp.cific differences in the roles and actions triggering slow inward *** greater networks,the p.thop.ysiological roles of slow inward currents can be better understood than p.ysiological *** inward currents are identified in the p.thop.ysiological background of autism,as slow inward currents drive early hyp.rsynchrony of the neural *** inward currents are significant contributors to p.roxysmal dep.larizational shifts/interictal *** events are related to ep.lep.y,but also found in Alzheimer's disease,p.rkinson's disease,and stroke,leading to the decline of cognitive *** with features overlap.ing with slow inward currents(excitatory,N-methyl-Dasp

关键词： astrocyte cortical sp.eading dep.larization gliotransmission glutamate neural synchronization NMDA recep.or p.roxysmal dep.larizational shift slow inward current