检索结果-南通市图书馆

Temperature uniformity,Correlations and the Flow Field in Swirling Impinging Jets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2023年第2期32卷 662-679页

作者： Zahir u.AHMED Yasir M.AL-ABDELI Department of Mechanical Engineering Khulna University of Engineering&TechnologyKhulna 9203Bangladesh School of Engineering Edith Cowan UniversityJoondalupWA 6027Australia

Infrared thermography,velocity and impingement pressure measurements alongside numerical modelling are used in this study to resolve(heated)surface temperature distributions of turbulent swirling impinging jets for two Reynolds numbers(Re=11600 and 24600).Whilst building upon earlier discoveries for this same geometry,this paper provides three new contributions:(1)identifying the role of impingement distance(H/D)as a deciding factor in the trade-off between more efficient heat transfer(at high swirl numbers)and achieving better substrate temperature uniformity(lower gradients),(2)developing correlations to predict Nusselt number for swirling and non-swirling cooling jets,and(3)predicting the underlying mixing field in these jets and its interplay with the thermal distributions *** indicate substrate temperature uniformity varies based on H/D and swirl intensity(S)with a significant level of thermal non-uniformity occurring in near-field impingement(H/D=1)at stronger swirl(S=0.59 and 0.74).Four correlations describing the effects of S,Re,and H on the average heat transfer and stagnation heat transfer are developed and yield accuracies of 8%and 12%,*** recirculation near the impingement surface is predicted at H/D=1 for stronger swirl jets which disappears at other substrate *** peak wall shear stress reduces and the flow impingement becomes radially wider at higher H/D and *** turbulence or eddy viscosity regions for non-swirling jets(S=0)are predicted in the shear layer and entrainment regions at H/D=1,but such turbulence is confined to the impingement and wall jet regions for strongly swirling flows.

关键词： Temperature uniformity Nusselt number IR imaging CTA RANS

维普期刊数据库

Inter-relationship of Various Results in Analysis of （14.0 MeV／u） Pb＋Pb Reaction using Mica and CN-85 Track Detectors

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2005年第1期22卷 69-71页

作者： F.N.Khattak E.u.Khan TabassumNasir J.J.Baluch F.u.Khan u.W.C. GomalUniversityDeraIsmailKhanPakistan RadiationPhysicsDivision PINSTECHNiloreIslamabadPakistan DepartmentofPhysics GomalUniversityDeraIsmailKhanPakistan

Two detector materials mica and cellulose-nitrate(CN)-85 have been used to study (14.0MeV/u) Pb + Pb reaction. Events of different multiplicities were registered in mica and CN-85 detectors using the 2π-geometry technique of solid state nuclear track detection. After removing the target material from the detectors the damaged trails in the detectors were revealed as tracks by proper chemical etching. The irradiated area of each sample was scanned and events of different multiplicities were traced. The binary events were bifurcated into elastic and inelastic events. The elastic binary events and three prong events, observed in the reaction, have been used to search out coefficients Cμν in the presence of both the detectors, for the reaction under study. using these coefficients 3- and 4-prong events have been analysed. From the detailed analysis of the results of (14.0MeV/u) Pb+Pb reaction, obtained from mica and CN-85 track detectors we observed a great resemblance of results obtained from the two detectors. Combining the results of both the detectors, we report some important outcomes.

关键词： CN-85轨迹探测器高能物理学铅原子碰撞反应固态

Optimal Site and Size of Distributed Generation Allocation in Radial Distribution Network using Multi-objective Optimization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2021年第2期9卷 404-415页

作者： Aamir Ali M.u.Keerio J.A.Laghari the Department of Electrical Engineering Quaid-E-Awam University of Engineering Science and TechnologyNawabshahPakistan

Distributed generation(DG)allocation in the distribution network is generally a multi-objective optimization *** maximum benefits of DG injection in the distribution system highly depend on the selection of an appropriate number of DGs and their capacity along with the best *** this paper,the improved decomposition based evolutionary algorithm(I-DBEA)is used for the selection of optimal number,capacity and site of DG in order to minimize real power losses and voltage deviation,and to maximize the voltage stability *** proposed I-DBEA technique has the ability to incorporate non-linear,nonconvex and mixed-integer variable problems and it is independent of local extrema *** order to validate the effectiveness of the proposed technique,IEEE 33-bus,69-bus,and 119-bus standard radial distribution networks are ***,the choice of optimal number of DGs in the distribution system is also *** simulation results of the proposed method are compared with the existing *** comparison shows that the proposed method has the ability to get the multi-objective optimization of different conflicting objective functions with global optimal values along with the smallest size of DG.

关键词： Distribution system distributed generation multi-objective optimization active power loss improved decomposition based evolutionary algorithm(I-DBEA)

维普期刊数据库

Pressure and Spectral Density of Fermions at Finite Temperature

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1999年第10期16卷 709-711页

作者： HOu De-fu u.Heinz LI Jia-rong Institute of Particle Physics Huazhong Normal UniversityWuhan 430079 Institut fur Theoretische Physik Universitat RegensburgD-93040 RegensburgGermany

The pressure of a fermion system is expressed as a mass integral over the full two-point spectral densities within the real time formalism by use of the Keldysh representation for the *** simpliSes the calculation significantly and allows a Dyson *** expression is used to demonstrate that potential infrared divergences are rendered *** apply it to check the pressures of an ideal fermion gas and of a chemically non-equilibrated quantum chromodynamics plasma.

关键词： Fermi apply render

Dissolution behavior of bioactive glass ceramics with different CaO/MgO ratios in SBF-K9 and r-SBF

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2014年第4期24卷 354-363页

作者： M.u.Hashmi Saqlain A.Shah Department of Applied Sciences Superior University Lahore 2. Department of PhysicsFC College (A Chartered University) Department of Material Science and Engineering Washington University

In the present work,we studied dissolution behavior of three glass ceramics samples each having 34 SiO2–14.5 P2O5–1 CaF2–0.5 MgF2(%wt)and ratio of CaO/MgO varying from 11.5:1 to 1:11.5 in conventional SBF(SBF-K9) and revised SBF(r-SBF) that has ionic concentration exactly equal to that of human blood *** that purpose,samples were immersed in fluids for different time periods upto 25 *** film XRD analysis revealed the diffusive nature of the phases on the surfaces of samples after soaking for different time periods in *** showed the poor precipitation and small thickness of the HCAp layer on the samples as compared to that in SBF-K9,thus indicating the fitness and sensitivity of r-SBF for in-vitro characterization of ***,FTIR and EDS revealed slow bonding rate on the surfaces of the samples in r-SBF than that in SBF-K9 that showed the dependence of bond formation on the composition of the materials as well as on the physiological fluid used for in-vitro *** rate of HCAp formation was slower in r-SBF due to more competitive adsorption of CO3 ions to Ca and Mg ions owing to greater amount of CO3 in r-SBF than that in *** shows the importance of CO3 content in the physiological fluids for the in-vitro assessment of ***,r-SBF is recommended to be used for assessment of samples to clearly understand their behavior in-vivo.

关键词： Dissolution behavior SBF-K9 r-SBF

The role of degenerative pathways in the development of irreversible consequences after brain ischemia

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 2019年第6期14卷 982-983页

作者： Ryszard Pluta Marzena u?amek-Kozio? Laboratory of Ischemic and Neurodegenerative Brain Research Mossakowski Medical Research CentrePolish Academy of Sciences First Department of Neurology Institute of Psychiatry and Neurology

Ischemic stroke and irreversible consequences:Ischemic stroke in humans is the second most common cause of death in the world(Mozaffarian et al.,2016).The outcomes after a stroke are often dependent on complications,including motor disorders,depression and dementia(Pluta et al.,2018a),which causes a high risk of re-hospitalization and/or palliative *** is also the main reason for long-term disability in people after stroke,with up to half of those who survived the stroke will not regain their independence until the end of their lives(Mozaffarian et al.,2016).According to epidemiological forecasts,human ischemic stroke will soon become the dominant cause of death worldwide(Bejot et al.,2016)as well as dementia with the phenotype of Alzheimer’s disease(AD;Kim and Lee 2018).It is suggested that human ischemic stroke and experimental brain ischemia in animals are associated with the possible development of AD neuropathology(Pluta et al.,2018a).

关键词： degenerative pathways irreversible consequences brain ischemia

维普期刊数据库

The importance of combined radiation and endocrine therapy in locally advanced prostate cancer

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2012年第2期14卷 245-246页

作者： Phiuip J Gray William u Shipley Harvard Radiation Oncology Program BostonMA 02114USA Department of Radiation Oncology Massachusetts General HospitalBostonMA 02114USA

The management of all stages of prostate cancer has become an increasingly com-plex task as new treatment paradigms are tested and the results of large randomized studies become available. Despite these advances, prostate cancer remains the second leading cause of cancer death and the seventh overall cause of death in men in the united States.

关键词： radiation endocrine therapy cancer

Diversity of wave structures to the conformable fractional dynamical 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

Journal of Ocean Engineering and Science 2023年第5期8卷 559-572页

作者： u.Younas J.Ren State Key Laboratory of Power Grid Environmental Protection/Henan Academy of Big Data Zhengzhou UniversityZhengzhou 450001China

This manuscript examines the recently developed conformable three-dimensional Wazwaz-Benjamin-Bona-Mahony(3D-WBBM)equation’s dynamical behavior in terms of its spatial and temporal *** governing equation is stretch for the Korteweg-de-Vries equation that represents the unidirectional propagation of small amplitude long waves on the surface of hydro magnetic and acoustic waves in a channel,especially for shallow *** wave solutions of various types,such as kink and shock,as well as singleton,combined solitons,and complex solitons,are all ***,solutions to hyperbolic,exponential,and trigonometric functions are obtained through the use of recently developed methods,namely the Kudryashov method(KM),the modified Kudryashov method(MKM),and the new extended direct algebraic method(NEDAM).The study conducts a comparison of our findings to well-known findings,and concludes that the solutions reached here are ***,the earned results are sketched in different shapes to demonstrate their dynamics as a function of parameter *** can assert from the obtained results that the applied techniques are simple,vibrant,and quite well,and will be helpful tool for addressing more highly nonlinear issues in various of fields,especially in ocean and coastal ***,our findings are first step toward understanding the structure and physical behavior of complicated *** anticipate that our results will be highly valuable in bet-ter understanding the waves that occur in the *** feel that this work is timely and will be of interest to a wide spectrum of experts working on ocean engineering models.

关键词： Integrability Soliton solutions 3D-WBBM equation Kudryashov and modified Kudryashov method NEDAM

A simple single-step approach towards synthesis of nanofluids containing cuboctahedral cuprous oxide particles using glucose reduction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2018年第1期12卷 74-82页

作者： u. Sandhya SHENOY A. Nityananda SHETTY Department of Chemistry National Institute of Technology Karnataka Surathkal Mangalore 575025 Karnataka India Department of Chemistry College of Engineering and Technology Srinivas University Mangalore 574146 India

Enhancement of thermal properties of conventional heat transfer fluids has become one of the important technical challenges. Since nanofluids offer a promising help in this regard, development of simpler and hassle free routes for their synthesis is of utmost importance. Synthesis of nanofluids using a hassle free route with greener chemicals has been reported. The single-step chemical approach reported here overcomes the drawbacks of the two-step procedures in the synthesis of nanofluids. The resulting Newtonian nanofluids prepared contained cuboctahedral particles of cuprous oxide and exhibited a thermal conductivity of 2.852 W- m-1. K-1. Polyvinylpyrro- lidone （PVP） used during the synthesis acted as a stabilizing agent rendering the nanofluid a stability of 9 weeks.

关键词： cuprous oxide nanofluids thermal conductivity viscosity