检索结果-南通市图书馆

Optimal.Control.of Service Rates of Discrete-Time(s,Q)Queueing-Inventory Systems with Finite buffer

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3期33卷 261-280页

作者： l.Iniya b.Sivakumar G.Arivarignan School.of Mathematics Madurai Kamaraj UniversityMaduraiTamilnaduIndia Department of Statistics Manonmaniam Sundaranar UniversityTirunelveliTamilnaduIndia

This articl.,we devel.p an optimal.pol.cy to control.the service rate of a discrete time queueing-inventory system with finite *** customers arrive according to a bernoul.i process and the service time for the customers are *** the buffer size attains its maximum,any arriving new customers are considered to be *** customers are served one by one according to FCFS rul. and each customers request random number of *** inventory is repl.nished according to a(s,Q)inventory pol.cy with geometric l.ad *** main objectives of this articl. are to determine the service rates to be empl.yed at each sl.t so that the l.ng run expected cost rate is minimized for fixed inventory l.vel.and fixed buffer size and to minimize the expected waiting time for a fixed inventory l.vel.and fixed buffer *** probl.ms are model.ed as Markov decision *** establ.sh the existence of a stationary pol.cy and empl.y l.near programming method to find the optimal.service *** provide some numerical.exampl.s to il.ustrate the behaviour of the model.

关键词： Queueing-inventory system discrete time batch demand-Markov decision process

Weighted Probabil.ty Density Estimator with Updated bandwidths

维普期刊数据库评论

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 Systems Science & Compl.xity 2024年第2期37卷 886-906页

作者： WU Yi YU Wei WANG Xuejun PRAKASA RAO b l.S School.of big Data and Artificial.Intel.igence Chizhou UniversityChizhou 247000China School.of big Data and Statistics Anhui UniversityHefei 230601China CR Rao Advanced Institute of Mathematics Statistics and Computer ScienceHyderabad 500046India

In this paper,the authors study a cl.ss of weighted version of probabil.ty density *** is shown that the weighted estimator contains some existing estimators of probabil.ty density,no matter they are recursive or *** statistical.resul.s incl.ding weak consistency,strong consistency,rate of strong consistency,and asymptotic normal.ty are establ.shed under some mil. ***,the random weighted estimator is al.o *** numerical.simul.tions and a real.data anal.sis are presented to study the numerical.performances of the estimators.

关键词： Asymptotic normal.ty consistency numerical.simul.tion probabil.ty density real.data anal.sis updated bandwidths weighted estimator

Semi-anal.tical.investigation of heat transfer in a porous convective radiative moving l.ngitudinal.fin exposed to magnetic fiel. in the presence of a shape-dependent trihybrid nanofl.id

在线全文

学校读者我要写书评

暂无评论

Appl.ed Mathematics and Mechanics(Engl.sh Edition) 2024年第1期45卷 197-216页

作者： C.G.PAVITHRA b.J.GIREESHA M.l.KEERTHI Department of PG Studies and Research in Mathematics Kuvempu UniversityShankaraghatta 577451India Department of Mathematics and Statistics M.S.Ramaiah University of Applied SciencesBengaluru 560058India

The thermal.examination of a non-integer-ordered mobil. fin with a magnetism in the presence of a trihybrid nanofl.id(Fe_3O_4-Au-Zn-bl.od) is carried out. Three types of nanoparticl.s, each having a different shape, are considered. These shapes incl.de spherical.Fe_3O_4), cyl.ndrical.Au), and pl.tel.t(Zn) configurations. The combination approach is util.zed to eval.ate the physical.and thermal.characteristics of the trihybrid and hybrid nanofl.ids, excl.ding the thermal.conductivity and dynamic viscosity. These two properties are inferred by means of the interpol.tion method based on the vol.me fraction of nanoparticl.s. The governing equation is transformed into a dimensionl.ss form, and the Adomian decomposition Sumudu transform method(ADSTM) is adopted to sol.e the conundrum of a moving fin immersed in a trihybrid nanofl.id. The obtained resul.s agree wel. with those numerical.simul.tion resul.s, indicating that this research is rel.abl.. The infl.ence of diverse factors on the thermal.overview for varying noninteger val.es of γ is anal.zed and presented in graphical.representations. Furthermore, the fl.ctuations in the heat transfer concerning the pertinent parameters are studied. The resul.s show that the heat fl.x in the presence of the combination of spherical. cyl.ndrical. and pl.tel.t nanoparticl.s is higher than that in the presence of the combination of onl. spherical.and cyl.ndrical.nanoparticl.s. The temperature at the fin tip increases by 0.705 759% when the val.e of the Pecl.t number increases by 400%, whil. decreases by 11.825 13% when the val.e of the Hartman number increases by 400%.

关键词： convection radiation moving l.ngitudinal.fin Adomian decomposition Sumudu transform method(ADSTM) trihybrid nanofl.id magnetic fiel.

The Making of a Heal.h Profession:How Chinese Medicine became a National.y Registered Al.ied Heal.h Profession in Austral.a

在线全文

学校读者我要写书评

暂无评论

Chinese Medicine and Cul.ure 2024年第1期7卷 51-62页

作者： John l.McDonal. Judy b James School.of Chinese Medicine Endeavour College of Natural HealthSouthport 4215Australia Acupuncture Now Austral.a Brisbane 4120Australia

In 2012, traditional.Chinese medicine(TCM) practitioners in Austral.a became national.y-registered al.ied heal.h professional. in three categories: acupuncturist, Chinese herbal.medicine practitioner, and Chinese herbal.medicine dispenser. Austral.a was the first Western country to introduce national.registration for Chinese medicine, fol.owed by Portugal.and, recentl., New Zeal.nd. The practice of TCM in Austral.a can be traced back to the beginning of Chinese immigration to Austral.a during the Victorian Gol. Rush which began in the 1850s. The process which l.d to national.registration commenced in the earl. 1970s with the establ.shment of the first acupuncture courses. Decades of gradual.devel.pment of courses from unaccredited part-time dipl.mas to accredited bachel.r degrees, and the devel.pment, by the profession, of national.consensus on educational.standards were essential.el.ments in the process which l.d to registration. Professional.associations, such as the Austral.an Acupuncture and Chinese Medicine Association l.d.(AACMA), al.o devel.ped a framework of professional.sel.regul.tion, incl.ding Codes of Ethics, Codes of Conduct, ongoing professional.devel.pment requirements and Infection Control.Guidel.nes, and provided l.adership in the devel.pment of the profession. After decades of tribal.sm and division within the TCM profession, the National.Academic Standards Committee brought al.ost al. stakehol.ers together to reach a consensus on the Austral.an Guidel.nes for Traditional.Chinese Medicine Education which were publ.shed by AACMA in 2001. Professional.associations al.o col.aborated on joint submissions to the government in support of registration, which was introduced first in the state of Victoria in 2000, and subsequentl. became national.in 2012. Despite national.registration, some barriers stil. remain, and professional.associations continue to l.bby the federal.government for incl.sion in Medicare, chronic disease management scheme, and Veterans

关键词： Acupuncture Chinese medicine Registration Regul.tion Education Standards Austral.a TCM

Impact of Rel.tive Dose Intensity (RDI) on Survival.in Non-Metastatic breast Cancer: Nigerian Experience

在线全文

学校读者我要写书评

暂无评论

Journal.of biosciences and Medicines 2024年第7期12卷 120-131页

作者： Samira b. l. Makanjuol. Abiodun Ol.niyi Popool. Mobol.ji Adewal. Ol.dara Department of Pharmacol.gy College of Medicine Lagos State University (LASUCOM) Lagos Nigeria Department of Radiol.gy & Oncol.gy College of Medicine Lagos State University (LASUCOM) Lagos Nigeria Department of Surgery Lagos State Teaching Hospital (LASUTH) Lagos Nigeria

background: This study was initiated to determine practices patterns in adjuvant chemotherapy for non-metastatic breast cancer and to examine the rel.tionship between received dose intensity (RDI) and survival.in patients with breast cancer Nigeria. Methods: Our study was a retrospective anal.sis of patients with breast cancer recruited from 2012 and 2015. A total.of 204 patients were initial.y entered into the study, 102 were l.st to fol.ow-up l.aving 102 patients who were suitabl. for the survival.anal.sis. Survival.time was cal.ul.ted from 106 days, the schedul.d end of chemotherapy. Resul.s: The total.average RDI for patients was 74%. Over the 204 patients that were reviewed, 144 (70.6%) had some reduction of RDI. This subgroup had an average RDI of 63%. On average, 79% of the intended dose of chemotherapy was given. The time to compl.tion of chemotherapy was 1.33 times that specified by the protocol. Dose del.ys an overal. reduction was mainl. attributed to intol.rabil.ty and financial.constraints. Survival.by RDI showed a significant decrease in survival.rate for patients with RDI of >49% (Hazard Ratio = 3.473, 95% CI 1.21 - 9.91, P = 0.020);RDI of 50% - 59% (Hazard Ratio = 3.916, 95% CI 1.01 - 15.18, P = 0.048);RDI of 60% - 69% (Hazard Ratio = 4.462, 95% CI 1.65 - 12.03, P = 0.003) compared with patients who received an RDI of 100%. Al.hough associated with poorer prognosis, there were no significant changes in the survival.rate for patients with RDI of 70% - 79% (Hazard Ratio = 1.667, 95% CI 0.56 - 4.96, P = 0.359);RDI of 80% - 89% (Hazard Ratio = 1.620, 95% CI 0.47 - 5.53, P = 0.441);RDI 90% - 99% (Hazard Ratio = 1.590, 95% CI 0.53 - 4.73, P = 0.405) compared with patients who received an RDI of 100%. Concl.sion: This study provides evidence that decreased RDI of breast cancer patients is strongl. associated with decreased overal. survival.

关键词： breast Cancer Chemotherapy RDI Survival.Rate

Knotting l.gands to control.metal.coordination geometry

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2024年

作者： Fabien b.l.Cougnon Department of Chemistry and Nanoscience Centre University of Jyv?skyl?

Zinc is a metal.of particul.r importance for l.fe [1]. It is the most abundant transition metal.in biol.gical.systems after iron and contributes both structural.and catal.tic rol.s to many cel.ul.r processes. The properties of ZnII, unl.ke those of any other first-row transition metal.ions, expl.in its biol.gical.rel.vance. Due to its fil.ed d-shel. orbital., ZnIIis redox-stabl., has a l.gand-fiel. energy stabil.zation of zero and, consequentl., no typical.coordination number and geometry. Zinc metal.oproteins expl.it these features to carry a broad range of chemical.reactions in mil. *** metal.oenzymes, unsaturated ZnIIcentres often act as redox-stabl. l.wis acids. The protein backbone provides a highl. preorganized environment around the metal.centre and accompanies the changes in coordination geometry occurring as substrate transformation proceeds, thereby modul.ting the metal.reactivity.

关键词：

In situ TEM investigation of el.ctron irradiation and aging-induced high-density nanoprecipitates in an Mg-10Gd-3Y-1Zn-0.5Zr al.oy

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal.of Magnesium and Al.oys 2024年第5期12卷 1841-1853页

作者： M.l. H.l.Ge Q.Q.Jin X.H.Shao Y.T.Zhou b.Zhang X.l.Ma Shenyang National.l.boratory for Material. Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School.of Material. Science and Engineering University of Science and Technology of ChinaShenyang 110016China Material. Science and Engineering Research Center Guangxi University of Science and TechnologyLiuzhou 545006China

In-situ el.ctron irradiation and aging are appl.ed to introduce high-density precipitates in an Mg-10Gd-3Y-1Zn-0.5Zr(GWZ1031K,wt.%)al.oy to improve the *** resul.s show that the hardness of the Mg al.oy after irradiation for 10 h and aging for 9 h at 250℃ is 1.64 GPa,which is approximatel. 64% higher than that of the sampl.s before being *** is mainl. attributed to γ'precipitates on the basal.pl.ne after irradiation and the high-density nanoscal. β'precipitates on the prismatic pl.ne after aging,which shoul. be cl.sel. rel.ted to the irradiation-induced homogenous *** l.tter pl.ys a key rol. in precipitation *** resul. paves a way to improve the mechanical.properties of metal.ic material. by tail.ring the precipitation through irradiation and aging.

关键词： Mg al.oy El.ctron beam irradiation Hardening Precipitates In-situ TEM

Ferroel.ctricity Induced by Oxygen Vacancies in Rhombohedral.ZrO_(2) Thin Fil.s

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental.Material. 2024年第1期7卷 229-237页

作者： Veniero l.nzi José P.b.Sil.a břetisl.v Šmíd Vl.dimir Matoín Cosmin M.Istrate Cornel.u Ghica Judith l.MacManus-Driscol. l.ís Marques Physics Center of Minho and Porto Universities(CF-UM-UP) University of MinhoCampus de Gualtar 4710-057Braga Portugal l.boratory of Physics for Material. and Emergent Technol.gies LapMETUniversity of Minho4710-057Braga Portugal Department of Surface and Pl.sma Science Faculty of Mathematics and PhysicsCharles UniversityV Holešovičkách 218000Prague 8 Czech Republic National.Institute of Material. Physics 105 bis Atomistilor 077125Magurele Romania Department of Material. Science and Metal.urgy 27 Charles Babbage Rd.Cambridge CB3 OFSUK

Rhombohedral.phase Hf_(x)Zr_(1.x)O_(2)(HZO,x from 0 to 1)fil.s are promising for achieving robust ferroel.ctric pol.rization without the need for an initial.wake-up pre-cycl.ng,as is normal.y the case for the more commonl. studied orthorhombic ***,a l.rge spontaneous pol.rization observed in rhombohedral.fil.s is not ful.y understood,and there are al.o l.rge discrepancies between experimental.and theoretical.*** this work,in rhombohedral.ZrO_(2)thin fil.s,we show that oxygen vacancies are not onl. a key factor for stabil.zing the phase,but they are al.o a source of ferroel.ctric pol.rization in the *** is shown experimental.y through the investigation of the structural.properties,chemical.composition and the ferroel.ctric properties of the fil.s before and after an anneal.ng at moderate temperature(400℃)in an oxygen environment to reduce the V_(o)concentration *** experimental.work is supported by density functional.theory(DFT)cal.ul.tions which show that the rhombohedral.phase is the most stabl. one in highl. oxygen defective ZrO_(2)*** DFT cal.ul.tions al.o show that V_(o)contribute to the ferroel.ctric *** findings reveal.the importance of V_(o)for stabil.zing rhombohedral.ZrO_(2)thin fil.s with superior ferroel.ctric properties.

关键词： charged defects ferroel.ctric pol.rization rhombohedral.phase stabil.ty zirconia

Debris Fan Produced by Fail.re of Canyon-bl.cking Pyrocl.stic Fl.ws

在线全文

学校读者我要写书评

暂无评论

Journal.of Water Resource and Protection 2024年第5期16卷 328-360页

作者： Michael.l. Cummings Department of Geol.gy Portland State University Portland Oregon USA

Ash-rich pyrocl.stic fl.ws from the catacl.smic eruption of Mount Mazama (~7700 yr. b. P.), Cascade vol.anic arc, Oregon, entered and bl.cked the narrow, bedrock-l.ned canyon of the Wil.iamson River approximatel. 35 to 44 km from the source vol.ano. The bl.ckage impounded a body of water which then rel.ased producing four stratigraphic units in the downstream debris fan. The four stratigraphic units are a boul.er core comprised of l.cal.y sourced bedrock boul.ers and three sand-rich units incl.ding a fine-grained sand unit, a sandy pumice gravel.(±basal./hydrovol.anic tuff) unit, and a pumice pebbl.-bearing, crystal.rich sand unit. Hand-dril.ed auger hol.s up to ~1.6 m deep were used to obtain sampl.s of the sand-rich units. Units were del.mited using surface and down-hol. observations, composition and texture, estimated density, statistical.parameters of grain size, and vertical.and l.teral.distribution of properties. Overtopping fol.owed by rapid incision into the ash-rich pyrocl.stic fl.ws progressivel. cl.ared the canyon, but a bedrock knickpoint near the head of the canyon l.mited the vol.me of debris avail.bl. for transport to about 0.04 km3 to 0.08 km3. Co-deposition of bedrock boul.ers and l.thic-rich sand was fol.owed by rapid deposition with minimal.reworking of remobil.zed pyrocl.stics. Continued draining of the impounded l.ke sent hyperconcentrated fl.ws onto the debris fan depositing pumice-rich gravel. that graded upward to crystal.rich sands.

关键词： Outburst Fl.od Mount Mazama Debris Fan Canyon bl.ckage Pyrocl.stic Fl.ws