检索结果-南通市图书馆

中国麻作 1997年第3期19卷 46-48,F003页

作者： J.DAS A.K.MOHANTY b.c.singh 冷鹃

Fuzzy Reliability and Availability of System under a calendar-based Inspection Involving Multiple Failures and Its Application to Wind Turbine System

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2024年第2期33卷 187-206页

作者： Mintu Kumar Himani Pant S.b.singh Department of Mathematics Statistics and computer Science G.B.Pant University of AgricultureTechnologyPantnagarUttarakhandIndia

Uncertainty is an important factor that needs to be considered while analyzing the performance of any engineering *** order to quantify uncertainty,fuzzy set theory is frequently used by most of researchers,including energy system *** to the classical reliability theory,component lifetimes have crisp parameters,but due to uncertainty and inaccuracy in data,it is sometimes very difficult to determine the exact values of these parameters in real-world *** overcome this difficulty in the current research,failure and repair rates were taken as triangular fuzzy numbers to determine the fuzzy availability of a system undergoing calendar-based periodic inspection subject to multiple failure modes(FMs).It was assumed that each component in the system had an exponential failure rate and repair rate with fuzzy *** FMs were explicitly taken into account when a functional state of the system was *** FM had a random failure *** the occurrence of any failure,a random time was selected for the relevant corrective repair *** proposed research was studied for one of the major sources of green energy,namely a wind turbine system wherein all the derived propositions have been implemented on it.

关键词： Fuzzy reliability fuzzy availability wind turbine system multiple failure modes triangular fuzzy number

constraining the variable generalized chaplygin gas model in matter creation cosmology

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

communications in Theoretical Physics 2024年第10期76卷 121-136页

作者： Yogesh bhardwaj c P singh Department of Applied Mathematics Delhi Technological University

We explore the variable generalized chaplygin gas（VGcG） model in the theory of matter creation cosmology within the framework of a spatially homogeneous and isotropic flat Friedmann—Lemai tre—Robertson—Walker space-time. Matter creation cosmology is based on reinterpretation of the energy–momentum tensor in Einstein's field equations. This creation corresponds to an irreversible energy flow from the gravitational field to the created matter constituents. The variable chaplygin gas（VcG） is also studied as a particular solution. We use the Markov chain Monte carlo method to constrain the free parameters of three models, namely,Lambda-cold-Dark matter（ΛcDM）, VGcG and VcG models with and without matter creation from the latest observational data from baryon acoustic oscillations, cosmic chronometer, type Ia supernovae（Pantheon） including gamma-ray bursts, quasars and the local measurement of H0from R21 data. Two different combinations of dataset provide a fairly tight constraint on the parameters of the ΛcDM, VGcG and VcG models. The present values of various cosmological parameters are obtained, which are very close to the ΛcDM model. Furthermore, we perform stability analysis, bayesian evidence analysis and information criteria analysis for these models through studying the sound speed, bayes factor, and Akaike information criteria（AIc） and bayesian information criteria（bIc） selection criteria. The values of sound speed for VGcG and VcG models shows that both the models are stable. According to AIc, it is observed that VGcG and VcG models with matter creation are supported considerably less by current observations,while bIc shows that these models are not favoured by observational data.

关键词： chaplygin gas model cosmological model dark energy matter creation

Runx2 regulates peripheral nerve regeneration to promote Schwann cell migration and re-myelination

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第7期19卷 1575-1583页

作者： Rong Hu Xinpeng Dun Lolita singh Matthew c.banton School of Traditional chinese Medicine Department of Traditional Chinese MedicineNanfang HospitalSouthern Medical UniversityGuangzhouGuangdong ProvinceChina The co-innovation center of Neuroregeneration Nantong UniversityNantongJiangsu ProvinceChina Faculty of Health University of PlymouthPlymouthUK

Runx2 is a major regulator of osteoblast differentiation and function;however,the role of Runx2 in peripheral nerve repair is unclea ***,we analyzed Runx2expression following injury and found that it was specifically up-regulated in Schwann ***,using Schwann cell-specific Runx2 knocko ut mice,we studied peripheral nerve development and regeneration and found that multiple steps in the regeneration process following sciatic nerve injury were *** observed in Runx2 knoc kout mice include increased prolife ration of Schwann cells,impaired Schwann cell migration and axonal regrowth,reduced re-myelination of axo ns,and a block in macrophage clearance in the late stage of *** together,our findings indicate that Runx2 is a key regulator of Schwann cell plasticity,and therefore peripheral nerve ***,our study shows that Runx2 plays a major role in Schwann cell migration,re-myelination,and peripheral nerve functional recovery following injury.

关键词： macrophage clearance migration peripheral nerve injury regeneration re-myelination Runx2 Schwann cells

Laser-induced graphene-coated wearable smart textile electrodes for biopotentials signal monitoring

在线全文

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2024年第1期18卷 95-111页

作者： c.M.Vidhya Yogita Maithani Sakshi Kapoor J.P.singh Department of Physics Indian Institute of Technology DelhiHauz KhasNew Delhi 110016India

This paper describes how to produce a wearable dry electrode at a reasonable cost and how to use it for the monitoring of biopotentials in *** textiles in wearable technologies have made a great advancement in the health care management and living standards of *** was manufactured using the low-cost single-step process,laser ablation of polyimide,a commercial *** dispersions were made using solvent isopropyl alcohol which has low boiling point,nontoxicity,and environmental *** successive coating of the graphene dispersion on the cotton fabric to make it conductive,the sheet resistance of the resulting fabric dropped to 3% of its initial *** laser-induced graphene(LIG)cotton dry electrodes thus manufactured are comparable to Ag/Agcl wet electrodes in terms of the skin-to-electrode impedance,measuring between 78.0 and 7.2 kΩ for the frequency between 40 Hz and 1 *** LIG cotton electrode displayed a signal-to-noise ratio of 20.17 *** to its comfort,simplicity,and good performance over a longer period of time,the textile electrode appears suited for medical applications.

关键词： biopotential electrocardiogram electromyogram flexible electrode textile porous graphene

Effect of using borax decahydrate as nanoparticles additive in blends of spirulina biodiesel/diesel on combustion characteristics and knock intensity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

clean Energy 2024年第3期8卷 62-78页

作者： Ajay Partap singh Puneet singh Gautam Mechanical Engineering Department IIMT University Meerut250001 Uttar PradeshIndia

In this extensive investigation,the impact of borax decahydrate as a fuel additive in a diesel single-cylinder engine was rigorously *** decahydrate was introduced at concentrations of 5,15,25 and 35 g in 500 ml of biodiesel,forming five unique fuel mixtures with conventional diesel:90%diesel+10%spirulina biodiesel(Sb10),Sb10+1 g borax decahydrate(Sb10b1),Sb10+3 g borax decahydrate(Sb10b3),Sb10+5 g borax decahydrate(Sb10b5)and Sb10+7 g borax decahydrate(Sb10b7).The investigation encompassed four diverse loading conditions and yielded insightful ***,at full load,Sb10b3 exhibited a higher cylinder peak pressure than diesel,reaching 69.25 *** release rate profiles demonstrated superior efficiency for Sb10 at 50%load,with a cumulative heat release rate of 950 J/°cA,which is lower than the 1050 J/°cA of *** intensity(KI)evaluations revealed that,although Sb10 and Sb10b1 exhibited higher KI than diesel at full load due to elevated peak pressure,Sb10b7 showed no knocking across all loads,indicative of reduced in-cylinder *** meticulous numerical analysis emphasizes the potential of borax decahydrate as a catalyst and enhancer,providing valuable insights into the combustion dynamics of these alternative fuel blends and their viability for sustainable and efficient engine *** summary,out of all the blends,Sb10b3 could be a potential diesel fuel replacement fuel for compression-ignition engines.

关键词： spirulina biodiesel borax decahydrate diesel engine combustion knock intensity HRR in-cylinder pressure

Thermodynamic properties and phase diagram of quark matter within non-extensive Polyakov chiral SU(3)quark mean field model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

chinese Physics c 2024年第5期48卷 60-71页

作者： Dhananjay singh Arvind Kumar Department of Physics Dr.B R Ambedkar National Institute of Technology JalandharJalandhar–144008PunjabIndia

In the present study,we applied Tsallis non-extensive statistics to investigate the thermodynamic properties and phase diagram of quark matter in the Polyakov chiral SU(3)quark mean field *** this model,the properties of the quark matter were modified through the scalar fieldsσ,ζ,δ,χ,vector fieldsω,ρ,ϕ,and Polyakov fieldsΦandΦ¯at finite temperature and chemical ***-extensive effects were introduced through a dimensionless parameter q,and the results were compared to those of the extensive case(q→1).In the non-extensive case,the exponential in the Fermi-Dirac(FD)function was modified to a q-exponential *** influence of the q parameter on the thermodynamic properties,pressure,energy,and entropy density,as well as trace anomaly,was *** speed of sound and specific heat with non-extensive effects were also ***,the effect of non-extensivity on the deconfinement phase transition as well as the chiral phase transition of u,d,and s quarks was *** found that the critical end point(cEP),which defines the point in the(T−μ)phase diagram where the order of the phase transition changes,shifts to a lower value of temperature,TcEP,and a higher value of chemical potential,μcEP,as the non-extensivity is increased,that is,q>1.

关键词： quark matter quark mean field model QcD phase diagram non-extensive statistics

Improving Heat Transfer in Parabolic Trough Solar collectors by Magnetic Nanofluids

在线全文

学校读者我要写书评

暂无评论

Energy Engineering 2024年第4期121卷 835-848页

作者： Ritesh singh Abhishek Gupta Akshoy Ranjan Paul bireswar Paul Suvash c.Saha Department of Applied Mechanics Motilal Nehru National Institute of Technology AllahabadPrayagrajIndia Department of Mechanical and Mechatronic Engineering University of Technology SydneySydneyAustralia

A parabolic trough solar collector(PTSc)converts solar radiation into thermal ***,low thermal efficiency of PTSc poses a hindrance to the deployment of solar thermal power *** performance of PTSc is enhanced in this study by incorporating magnetic nanoparticles into the working *** circular receiver pipe,with dimensions of 66 mm diameter,2 mm thickness,and 24 m length,is exposed to uniform temperature and velocity *** working fluid,Therminol-66,is supplemented with Fe3O4 magnetic nanoparticles at concentrations ranging from 1%to 4%.The findings demonstrate that the inclusion of nanoparticles increases the convective heat transfer coefficient(HTc)of the PTSc,with higher nanoparticle volume fractions leading to greater heat transfer but increased pressure *** thermal enhancement factor(TEF)of the PTSc is positively affected by the volume fraction of nanoparticles,both with and without a magnetic ***,the scenario with a 4%nanoparticle volume fraction and a magnetic field strength of 250 G exhibits the highest TEF,indicating superior thermal *** findings offer potential avenues for improving the efficiency of PTScs in solar thermal plants by introducing magnetic nanoparticles into the working fluid.

关键词： Parabolic trough solar collector(PTSc) magnetic nanofluid(MNF) heat transfer convective heat transfer coefficient(HTc) thermal enhancement factor(TEF)

black hole shadows in Einstein-bel-Robinson gravity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

chinese Physics c 2024年第5期48卷 272-283页

作者： b.Hamil b.c.Lütfüoğlu Laboratoire de Physique Mathématique et Subatomique Facultédes Sciences ExactesUniversitéConstantine 1ConstantineAlgeria Department of Physics University of Hradec KrálovéRokitanského 6250003 Hradec KrálovéCzechia

Gravity models given by higher-order scalar curvature corrections are believed to bear important consequences. Einstein-bel-Robinson (EbR) gravity with quartic curvature modification motivated Sajadi et al. to explore static spherically symmetric black hole solutions using perturbative methods. In this study, inspired by their work, we investigate AdS black hole shadows in EbR gravity and demonstrate how the gravity parameter alters the energy emission rate. Finally, we address the same problem in the presence of plasma, because the black holes are thought to be surrounded by a medium that changes the geodesic of photons.

关键词： black hole shadows Einstein-bel-Robinson gravity plasma

Use of waste plastic oil as a fuel in reactivity-controlled compression ignition engines:a bibliometric investigation from 2017-23

在线全文

学校读者我要写书评

暂无评论

clean Energy 2024年第3期8卷 206-222页

作者： Sumit Kanchan Sarbjot singh Sandhu Department of Mechanical Engineering Dr B R Ambedkar National Institute of TechnologyJalandharPunjabIndia School of Mechanical Engineering Lovely Professional UniversityJalandharPunjabIndia

Waste plastic oil,generated through the pyrolysis of plastic without oxygen,known as plastic-to-fuel conversion,stands as a promising alternative *** research employs bibliometric analysis,a quantitative method,to comprehensively assess publications in the domain of waste plastic oil integration within reactivity-controlled compression ignition *** Scopus as the primary repository post-2017,the study categorizes information into pivotal aspects,including influential journals,countries,authors,affiliations,document types,thematic areas,sponsors and *** analysis reveals significant contributions from diverse nations,prominently India,china,Turkey and *** is the prevalence of Energy,Engineering and chemical Engineering as thematic focal points,with the journal Fuel leading the count followed by the journal Energy emerging as a prominent *** contributions are prolific,led by Gandhi Institute of Technology and Management University and Vellore Institute of *** authors‘Gugulothu S.K’and‘He Z’play a pivotal role in shaping the *** National Natural Science Foundation of china stands out as a primary *** bibliometric analysis provides a structured understanding of waste plastic oil integration in reactivity-controlled compression ignition engines,laying the groundwork for future research *** study identifies potential research platforms beyond Scopus,including Web of Science,crossRef,Science Direct and Google Scholar,as valuable repositories for further ***,after careful observation of the research articles published by the top 10 authors as found in the study,it was found that the authors share a few common characteristics that helped them in advancing the understanding and application of waste plastic oil in reactivity-controlled compression ignition *** are also summarized in the present study with supporting data.

关键词： bibliometric analysis plastic-to-fuel waste plastic oil RccI engine Scopus database