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Microstructure transformations and improving wear resistance of austenitic stainless steel additively fabricated by arc-based DED process

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Defence Technology（防务技术） 2024年第8期38卷 194-204页

作者： Ashish Yadav Manu Srivastava Prashant K.jain Sandeep Rathee Hybrid Additive Manufacturing laboratory Mechanical Engineering DepartmentPDPM Indian Institute of Information TechnologyDesign&ManufacturingJabalpur482005Madhya PradeshIndia FFF laboratory Mechanical Engineering DepartmentPDPM Indian Institute of Information TechnologyDesign&ManufacturingJabalpur482005Madhya PradeshIndia Department of Mechanical Engineering National Institute of TechnologySrinagarIndia

In this study, austenitic stainless steel(ASS) was additively fabricated by an arc-based direct energy deposition(DED) technique. Macrostructure, microstructure, mechanical characteristics at different spatial orientations(0°, 90°, and 45°), and wear characteristics were evaluated at the deposited structure top, middle, and bottom regions. Results show that austenite(γ) and delta-ferrite(δ) phases make up most of the microstructure of additively fabricated SS316lSi steel. Within γ matrix, δ phase is dispersed both(within and along) grain boundaries, exhibiting a fine vermicular morphology. The bottom, middle,and top regions of WAAM deposited ASS exhibit similar values to those of wrought SS316l in the tensile and impact test findings. Notably, a drop in hardness values is observed as build height increases. During SEM examinations of fractured surfaces from tensile specimen, closed dimples were observed, indicating good ductility of as-built structure. Wear test findings show signs of mild oxidation and usual adhesive wear. By depositing a mechanically mixed composite layer, an increase in the oxidation percentage was discovered to facilitate healing of worn surfaces. The findings of this study will help in design, production and renovation of products/components that are prone to wear. WAAM-deposited ASS has remarkable strength and ability to withstand impacts;it can be used in the production of armour plates for defence applications, mainly military vehicles and aircraft.

关键词： Metal additive deposition Defence applications Arc-based DED Characterization Wear behaviour Fractography

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Exploring the Potential of Syzygium cumini(l.)Skeels(Jamun)Seed Powder as an Eco-Friendly Agent for Developing Friction Ridges on Porous and Nonporous Surfaces

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Journal of Forensic Science and Medicine 2024年第2期10卷 75-83页

作者： Vaibhav Sharma Abhishek R.Rai Divyansh jain Poonam Kumari Varad Nagar Anubhav Singh Kumud Kant Awasthi Archana Gautam Tina Sharma Mahipal Singh Sankhla Anuj Sharma Department of Forensic Science Vivekananda Global UniversityJaipurRajasthanIndia School of Forensics Risk Management and National SecurityRashtriya Raksha UniversityLavadGujaratIndia Department of life Sciences Vivekananda Global UniversityJaipurRajasthanIndia Department of Forensic Science UIAHSChandigarh UniversityMohaliPunjabIndia University Centre for Research and Development Chandigarh UniversityMohaliPunjabIndia Department of Forensic Science ITM UniversityGwaliorM.P.India

Background:Development of obscured fingerprints on a diverse range of surfaces is a crucial aspect of forensic *** and Objectives:In this particular study,the utilization of Syzygium cumini(l.)Skeels(Jamun)seed powder was examined for the purpose of revealing hidden fingerprints on a variety of surfaces,including both permeable and impermeable *** and Methods:The seed powder was extracted using a simple process and was analysed using multiple analytical *** efficacy of the jamun seed powder in developing latent fingerprints was ***:The findings of this investigation demonstrate that the jamun seed powder was capable of producing fingerprint patterns of exceptional quality and clarity on numerous ***:This research highlights the potential use of jamun seed powder as a practical and effective alternative for the development of hidden fingerprints in forensic investigations,while also providing cost-effectiveness.

关键词： Forensic investigation jamun seed latent fingerprints medicinal value

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Dengue induced acute liver failure:A meta summary of case reports

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World Journal of Virology 2024年第1期13卷 133-142页

作者： Deven Juneja Ravi jain Prashant Nasa Department of Critical Care Medicine Max Super Speciality HospitalNew Delhi 110017India Department of Critical Care Medicine Mahatma Gandhi Medical College and HospitalJaipur 302022RajasthanIndia Department of Critical Care Medicine NMC Specialty HospitalDubai 7832United Arab Emirates

BACKGROUND Dengue fever is the most common cause of viral hemorrhagic fever,with more than 400 million cases being reported annually,*** though hepatic involvement is common,acute liver failure(AlF)is a rare complication of dengue *** To analyze the demographic profile,symptomology,hospital course and outcomes of patients presenting with AlF secondary to dengue infection by reviewing the published case *** A systematic search was performed from multiple databases including PubMed,Reference Citation Analysis,Science Direct,and Google *** search terms used were"dengue"OR"severe dengue"OR"dengue shock syndrome"OR"dengue haemorrhagic syndrome"OR"dengue fever"AND"acute liver failure"OR"hepatic failure"OR"liver injury".The inclusion criteria were:(1)Case reports or case series with individual patient details;(2)Reported acute liver failure secondary to dengue infection;and(3)Published in English language and on adult *** data were extracted for patient demographics,clinical sympto-matology,clinical interventions,hospital and intensive care unit course,need for organ support and clinical *** Data from 19 case reports fulfilling the predefined inclusion criteria were *** median age of patients was 38 years(inter quartile range:Q3-Q126.5 years)with a female preponderance(52.6%).The median days from diagnosis of dengue to development of AlF was 4.5 *** increase in aspartate aminotransferase was higher than that in alanine aminotransferase(median 4625 U/l vs 3100 U/l).All the patients had one or more organ failure,with neurological failure present in 73.7%cases.42.1%patients required vasopressor support and hepatic enceph-alopathy was the most reported complication in 13(68.4%)*** of the patients were managed conser-vatively and 2 patients were taken up for liver *** 1 death was reported(5.3%).CONClUSION Dengue infection may rarely lead to *** patients may frequently require inten

关键词： Dengue fever Acute liver failure Dengue induced hepatitis Hepatic failure Fulminant hepatitis Severe dengue

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long-term follow-up of kidney transplant recipients admitted to a tertiary care transplant center with SARS-CoV-2

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World Journal of Virology 2024年第2期13卷 87-95页

作者： Emily E Zona Mina l Gibes Asha S jain Jeannina A Smith Jacqueline M Garonzik-Wang Didier A Mandelbrot Sandesh Parajuli Division of Nephrology Department of MedicineUniversity of Wisconsin School of Medicine and Public HealthMadisonWI 53705United States Department of Infectious Disease University of Wisconsin Hospital and ClinicsMadisonWI 53705United States Department of Surgery University of WisconsinMadisonWI 53705United States Department of Medicine University of Wisconsin School of Medicine and Public HealthMadisonWI 53705United States Department of Medicine University of Wisconsin School of Medicine and Public HealthUniversity of Wisconsin MadisonMadisonWI 53705United States

BACKGROUND Kidney transplant recipients(KTR)are at risk of severe coronavirus disease 2019(COVID-19)disease and mortality after severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)*** predicted that hospitalization for COVID-19 and subsequent admission to the intensive care unit(ICU)would yield worse outcomes in *** was stratified by ICU *** of interest included risk factors for ICU admission and mortality,length of stay(lOS),respiratory symptoms at admission,all-cause graft failure at the last follow-up,and death related to *** 96 KTRs were hospitalized for SARS-COV-2 infection.21(22%)required ICU *** ICU group had longer hospital lOS(21.8 vs 8.6 days,Plikely to experience graft failure(81%vs 31%,Plast-follow up,and 71%had death related to *** factors for ICU admission included male sex(aHR:3.11,95%CI:1.04-9.34;P=0.04).Risk factors for all-cause mortality and COVID-19-related mortality included ICU admission and advanced age at SARS-CoV-2 *** was highest within a month of COVID-19 diagnosis,with the ICU group having increased risk of all-cause(aHR:11.2,95%CI:5.11-24.5;Plated mortality(aHR:27.2,95%CI:8.69-84.9;PlUSION ICU admission conferred an increased risk of mortality,graft failure,and longer ***-fifth of those hospit-alized died of COVID-19,reflecting the impact of COVID-19-related morbidity and mortality among KTRs.

关键词： Kidney transplants SARS-CoV-2 Intensive care unit admission Outcomes Graft failure

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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 Pál Department of Physiology Faculty of MedicineUniversity of DebrecenDebrecenHungary

Slow inward currents are known as neuronal excitatory currents mediated by glutamate release and activation of neuronal extra synaptic N-met hyl-D-aspartate receptors with the contribution of *** events are significantly slower than the excitatory postsynaptic *** of slow inward currents are determined by seve ral factors including the mechanisms of astrocytic activation and glutamate release,as well as the diffusion pathways from the release site towards the extra synaptic recepto *** 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 pathological *** 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 synaptic strength via eliciting timing-dependent synaptic *** addition,slow inward currents are also subject to non-synaptic plasticity triggered by long-la sting stimulation of the excitatory *** note,there might be important regionspecific differences in the roles and actions triggering slow inward *** greater networks,the pathophysiological roles of slow inward currents can be better understood than physiological *** inward currents are identified in the pathophysiological background of autism,as slow inward currents drive early hypersynchrony of the neural *** inward currents are significant contributors to paroxysmal depolarizational shifts/interictal *** events are related to epilepsy,but also found in Alzheimer's disease,Parkinson's disease,and stroke,leading to the decline of cognitive *** with features overlapping with slow inward currents(excitatory,N-methyl-Dasp

关键词： astrocyte cortical spreading depolarization gliotransmission glutamate neural synchronization NMDA receptor paroxysmal depolarizational shift slow inward current

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On calculating glacial isostatic adjustment

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Geodesy and Geodynamics 2024年第5期15卷 441-452页

作者： l.M.Cathles Cornell University IthacaNY 14853USA

Modeling the earth's fluid and elastic response to the melting of the glaciers of the last ice age is the most direct way to infer the earth's radial viscosity ***,we compare two methods for calculating the viscoelastic response to surface *** one,the elastic equation of motion is converted to a viscoelastic equation using the Correspondence *** the other,elastic deformation is added to the viscous flow as isostatic adjustment *** two modeling methods predict adjustment histories that are different enough to potentially impact the interpretation of the observed glacial isostatic adjustment(GIA).The differences arise from buoyancy and whether fluid displacements are subjected to hydrostatic *** methods agree if they use the same equations and boundary *** origin of the differences is determined by varying the boundary conditions and pre-stress application.

关键词： Glacial isostatic adjustment Viscoelastic normal modes Hydrostatic pre-stress Elastic buoyancy Correspondence principle

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Effect of radiative loss mechanisms on FIR thermometric parameters of Nd^(3+)-doped lithium tellurite glasses

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Journal of Rare Earths 2024年第7期42卷 1250-1257,I0002页

作者： C.Y.Morassuti A.P.l Silva l.A.O.Nunes S.M.lima l.H.C.Andrade Optical and Photothermal Spectroscopy Group(GEOF) Center for Studies in Natural Resources(CERNA)State University of Mato Grosso do Sul(UEMS)C.P.351DouradosMSBrazil Renato Archer Information Technology Center Dom Pedro I Highway(SP-65)Km 1436-Chácaras Campos dos AmaraisCampinasSPBrazil Institute of Physics of São Carlos University of São PauloSão CarlosSPBrazil

Nd^(3+)-doped tellurite glasses are promising materials for thermometers based on the fluorescence intensity ratio(FIR)***,at high Nd^(3+)concentrations,energy transfer(ET)processes such as optical reabsorption and cross-relaxation can affect the Nd^(3+)emission,which has been little explored in the ***,the present work investigated the use of Nd^(3+)-doped tellurite glass(samples doped with Nd^(3+)at 0.2 mol%,0.5 mol%,2.0 mol%,and 4.0 mol%)in fluorescence thermometers,in the temperature range from 299 to 371 *** results indicate a strong dependence of the FIR parameters on the Nd^(3+)concentration,due to changes in the emission band profiles caused by optical reabsorption of the Nd^(3+)emissions and cross-relaxation processes.A decrease of the relative sensitivity of the ratio^(4)F_(5/2)→^(4)I_(9/2)/^(4)F_(3/2)→^(4)I_(9/2)is observed for samples doped with higher amounts of Nd^(3+).The maximum relative sensitivity at 299 K is 3.00%/K,which is the highest value among the reported Nd^(3+)ions.

关键词： Nd^(3+)-doped tellurite glass Fluorescence intensity ratio Optical thermometry Judd-Ofelt Rare earths

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Non-adhesive and adhesive contacts of an elastic quarter-or eighth-space with freely sliding sides

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Friction 2024年第9期12卷 2052-2063页

作者： Qiang lI Valentin l.POPOV Technische Universität Berlin Berlin 10623Germany

The contact of an elastic quarter-or eighth-space is studied under the condition that the movement of the side surface of the quarter-space is constrained:It can slide freely along the plane of the side surface but its normal movement is blocked(for example,by a rigid wall).The solution of this contact problem can be easily achieved by additionally applying a mirrored load to an elastic ***-adhesive contact and the Johnson–Kendall–Roberts(JKR)-type adhesive contact between a rigid sphere and an elastic quarter-space under such a boundary condition is numerically simulated using the fast Fourier transform(FFT)-assisted boundary element method(BEM).Contacts of an elastic eighth-space are investigated using the same *** on the position of the sphere relative to the side edge,different contact behavior is *** the case of adhesive contact,the force of adhesion first increases with increasing the distance from the edge of the quarter-space,achieves a maximum,and decreases further to the JKR-value in large distance from the *** enhancement of the force of adhesion compared to the half-space-contact is associated with the pinning of the contact area at the *** provide the maps of the force of adhesion and their analytical approximations,as well as pressure distributions in the contact plane and inside the quarter-/eighth-space.

关键词： quarter-space eighth-space adhesion edge effect boundary element method(BEM)

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Quantum vortices get stretched

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Frontiers of physics 2024年第3期19卷 225-227页

作者： Emanuel A.l.Henn São Carlos Institute of Physics University of São Paulo-PO Box 36913560-970São CarlosBrazil

Since its discovery, superfluidity [1,2] remains one of the most remarkable phenomena in quantum physics. The onset of the quantum regime in liquid helium is visually striking, when the fluid flows without dissipation or detaches from a rotating bucket, remaining still upon soft rotations. The same phenomenon is present in the context of ultracold bosonic quantum gases where, most of the time, superfluidity walks hand-in-hand with the transition to Bose−Einstein condensation [3].

关键词： quantum rotating rotation

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Time-inconsistent stochastic linear-quadratic control problem with indefinite control weight costs

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Science China Mathematics 2024年第1期67卷 211-236页

作者： Qi lü Bowen Ma School of Mathematics Sichuan UniversityChengdu 610064China

A time-inconsistent linear-quadratic optimal control problem for stochastic differential equations is *** introduce conditions where the control cost weighting matrix is possibly *** such conditions,we obtain a family of closed-loop equilibrium strategies via multi-person differential *** result extends Yong’s work(2017) in the case of stochastic differential equations,where a unique closed-loop equilibrium strategy can be derived under standard conditions(namely,the control cost weighting matrix is uniformly positive definite,and the other weighting coefficients are positive semidefinite).

关键词： linear-quadratic optimal control problem time-inconsistent cost functional generalized Riccati equation indefinite control weight cost closed-loop equilibrium strategy

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