检索结果-南通市图书馆

Multi-objective optimal control of tungiasis diseases with terminal demands

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2024年第3期17卷 123-151页

作者： Wei Lv si-ting Zhang Lei Wang Department of Mathematics Shanghai University Shanghai200444P.R.China Key Laboratory for Computational Mathematics and Data Intelligence of Liaoning Province Dalian University of Technology Dalian 116024P.R.China Department of Mathematics School of Science Shihezi UniversityShihezi 832003P.R.China

In this paper,we aim to minimize the epidemic size of tungiasis disease and economic costs simultaneously,with terminal demands for infected humans.A human-jigger parasite control system with four control schemes for humans and jiggers is *** propose a multi-objective optimal control problem with terminal constraints,in which the accumulated number of infected humans and control costs are *** applying the modified normal boundary intersection algorithm and the interior point scheme,numerical simulations for different combinations of control schemes are carried out,and actual data in Madagascar are *** combination schemes are indicated from the perspectives of disease eradication,cost saving and time *** these effective combinations are properly performed,the disease can be *** only minimizing the epidemic size,the combination of the optimal treatments and adulticiding efforts is the best choice in the rainy season;the combination of the optimal personal protections and treatments is the preferential option in the dry *** only minimizing the economical cost,the combination of the optimal adulticide and larvicide is the better selection in the rainy season;the combination of the optimal personal protections,treatments and adulticiding efforts is the prior choose in the dry ***,there is a trade-off between the two objectives for all the effective combinations,decision-makers may choose an appropriate one to control the disease.

关键词： Multi-objective optimal control terminal demand control combination tun-giasis disease

Jet formation in shock-heavy gas bubble interaction

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

Acta Mechanica sinica 2013年第1期29卷 24-35页

作者： Zhi-Gang Zhai ting si Li-Yong Zou Xi-Sheng Luo Department of Modern Mechanics University of Science and Technology of China National Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid Physics CAEP

The influences of the acoustic impedance and shock strength on the jet formation in shock-heavy gas bubble interaction are numerically studied in this work. The process of a shock interacting with a krypton or a SF6 bubble is studied by the numerical method VAS2D. As a validation, the experiments of a SF6 bubble accelerated by a planar shock were performed. The results indicate that, due to the mismatch of acoustic impedance, the way of jet formation in heavy gas bubble with different species is diversified under the same initial condition. With respect to the same bubble, the manner of jet formation is also distinctly different under different shock strengths. The disparities of the acoustic impedance result in different effects of shock focusing in the bubble, and different behaviors of shock wave inside and outside the bubble. The analyses of the wave pattern and the pressure variation indicate that the jet formation is closely associated with the pressure perturbation. Moreover, the analy- sis of the vorticity deposition, and comparisons of circulation and baroclinic torque show that the baroclinic vorticity also contributes to the jet formation. It is concluded that the pres- sure perturbation and baroclinic vorticity deposition are the two dominant factors for the jet formation in shock-heavy gas bubble interaction.

关键词： Shock-bubble interaction - Heavy gas bubble Acoustic impedance Jet

Enhancing hydrogen sorption in MgH_(2) by controlling particle size and contact of Ni catalysts

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第4期40卷 995-1002页

作者： ting-Zhi si Xue-Yang Zhang Jing-Jing Feng Xiao-Li Ding Yong-Tao Li School of Materials Science and Engineering Anhui University of TechnologyMaanshan 243002China

A comparative study based on MgH2 ball-milled with altered Ni particle sizes under different conditions was conducted to reveal the effect of close contact between hydrides and metal catalysts on their hydrogen sorption *** is found that the Mg+nano-Ni(5 at%)composites not only exhibit a substantial decreased onset desorption temperature by approximately 180℃ but also dramatically enhance the absorption kinetics by sixteen times in comparison with those of pure MgH_(2).This remarkable kinetics enhancement can be explained by the superior catalytic effect of Ni present in composites that highly depends on its particle size and its close contact with MgH2.

关键词： Hydrogen storage Magnesium hydride Nickel Sorption properties Catalytic effect

Experimental investigation on flow modes of electrospinning

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica sinica 2012年第3期28卷 644-652页

作者： ting si Guang-Bin Li Xing-Xing Chen Rui-Jun Tian Xie-Zhen Yin Department of Modern Mechanics University of Science and Technology of China230026 HefeiChina

Electrospinning experiments are performed by using a set of experimental apparatus, a stroboscopic system is adopted for capturing instantaneous images of the cone- jet configuration. The cone and the jet of aqueous solutions of polyethylene oxide （PEO） are formed from an orifice of a capillary tube under the electric field. The viscoelastic con- stitutive relationship of the PEO solution is measured and discussed. The phenomena owing to the jet instability are described, five flow modes and corresponding structures are obtained with variations of the fluid flow rate Q, the electric potential U and the distance h from the orifice of the cap- illary tube to the collector. The flow modes of the cone-jet configuration involves the steady bending mode, the rotat- ing bending mode, the swinging rotating mode, the blurring bending mode and the branching mode. Regimes in the Q-U plane of the flow modes are also obtained. These results may provide the fundamentals to predict the operating conditions expected in practical applications.

关键词： Electrospinning - Flow mode Jet instability Non-Newtonian fluid Ultrafine fiber

Synergistic catalysis of isolated Fe^(3+) and Fe_2O_3 on FeO_x/HZSM-5 catalysts for Friedel-Crafts benzylation of benzene

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2011年第6期22卷 639-642页

作者： Tao Lin Xin Zhang Rong Li ting Bai si Ying Yang School of Chemical Engineering Northwest UniversityXi'an 710069China

FeO_x/HZSM-5 catalyst with 8 wt.%Fe-loading（8-FeZ） exhibited significantly higher reactivity in the benzylation of benzene with benzyl chloride than FeO_x/HZSM-5 catalyst with 2.5 wt.%Fe-loading（2.5-FeZ） because t... 详细信息

关键词： Friedel-Crafts Synergistic catalysis Benzene Diphenylmethane Fe^(3+) FeO_x/HZSM-5

Numerical study on the evolution of the shock-accelerated SF_6 interface:Influence of the interface shape

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2012年第2期55卷 284-296页

作者： FAN MeiRu ZHAI ZhiGang si ting LUO XiSheng ZOU LiYong TAN DuoWang Department of Modern Mechanics University of Science and Technology of ChinaHefei 230026China National Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid Physics Chinese Academy of Engineering PhysicsMianyang 621900China

The early phases of the shock interaction process on two-dimensional interfaces with different shapes are numerically investigated in this study,which are closely related to the shock refraction and reflection,vorticity production and *** numerical method employs an adaptive unstructured quadrilateral mesh,which can capture the wave pattern and interface evolution very *** are carried out under the conditions of an incident shock Mach number of 1.2 and the light/heavy (air/SF 6) *** different shapes are considered in the simulations:rectangle,ellipse,diamond and two kinds of *** results show that the interfacial shapes can influence the wave patterns particularly on the shape and evolution of refracted shock *** generation and the distribution of vorticity on the interfaces with five different shapes also have *** circulation deposition on five interfaces is quantitatively investigated and compared with theoretical model.A good agreement is found between the numerical results and the predictions by the theoretical *** characteristic scales of the interface are *** the influence of nonlinear-acoustic effect and vorticity effect,the interfaces present different evolution modes.

关键词： binaries: interfacial instability planar shock different shapes

Research progress on animal models of corneal epithelial-stromal injury

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2023年第11期16卷 1890-1898页

作者： Li-Rui Liu Dan Chen si-ting Sheng Jing-Wei Xu Wen Xu Eye Center The Second Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhou 310009Zhejiang ProvinceChina Zhejiang Provincial Key Laboratory of Ophthalmology Zhejiang Provincial Clinical Research Center for Eye DiseasesHangzhou 310009Zhejiang ProvinceChina Zhejiang Provincial Engineering Institute on Eye Diseases Hangzhou 310009Zhejiang ProvinceChina

A corneal epithelial-stromal defect is recognized as a major contributor to corneal *** the rising prevalence of blindness caused by corneal scarring,increasing attention has been focused on corneal epithelialstromal ***,the etiology and pathogenesis of these defects remain inadequately understood,necessitating further investigation through experimental *** modeling methods exist both domestically and internationally,each with distinct adaptive conditions,advantages,and *** review primarily aims to summarize the techniques used to establish optimal animal models of corneal epithelial-stromal injury,including mechanical modeling,chemical alkali burns,post-refractive surgery infections,and genetic *** intention is to provide valuable insights for studying the mechanisms underlying corneal epithelial-stromal injury and the development of corresponding therapeutic interventions.

关键词： cornea corneal epithelial-stromal defect corneal epithelial-stromal injury corneal scarring animal models

Toughening Poly(lactic acid) with Imidazolium-based Elastomeric Ionomers

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

Chinese Journal of Polymer Science 2018年第12期36卷 1342-1352页

作者： Lu Chen Kuan Hu si-ting Sun Hai Jiang Dong Huang Kun-Yu Zhang Li Pan Yue-Sheng Li Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and Engineering Tianjin University Tianjin 300350 China School of Chemical Engineering and Technology Tianjin University Tianjin 300350 China Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300072 China

Imidazolium-based elastomeric ionomers （i-BIIR） were facilely synthesized by ionically modified brominated poly（isobutylene-co-isoprene）（BIIR） with different alkyl chain imidazole and thoroughly explored as novel toughening agents for poly（lactic acid）（PLA）. The miscibility, thermal behavior, phase morphology and mechanical property of ionomers and blends were investigated through dynamic mechanical analyses （DMA）, differential scanning calorimetry （DSC）, scanning electron microscopy （SEM）, tensile and impact testing. DMA and SEM results showed that better compatibility between the PLA and i-BIIR was achieved compared to the PLA/unmodified BIIR elastomer. A remarkable improvement in ductility with an optimum elongation at break up to 235% was achieved for the PLA/i-BIIR blends with 1-dodecylimidazole alkyl chain （i-BIIR-12）, more than 10 times higher than that of pure PLA. The impact strengths of PLA were enhanced from 1.9 kJ/m2 to 4.1 k J/m2 for the PLA/10 wt% i-BIIR-12 blend. Toughening mechanism had been established by systematical analysis of the compatibility, intermolecular interaction and phase structures of the blends. Interracial cavitations initiated massive shear yielding of the PLA matrix owing to a suitable interfacial adhesion which played a key role in the enormous toughening effect in these blends. We believed that introducing imidazolium group into the BIIR elastomer was vital for the formation of a suitable interfacial adhesion.

关键词： Imidazolium-based ionomer Poly(lactic acid) Brominated poly(isobutylene-co-isoprene) Toughening Blend

Supratentorial hemangioblastoma at the anterior skull base:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第26期10卷 9518-9523页

作者： si-ting Xu Xin Cao Xu-Yang Yin Jing-Yi Zhang Jin Nan Jun Zhang Department of Radiology Huashan HospitalFudan UniversityShanghai 200040China

BACKGROUND Hemangioblastoma(HB)is a rare tumor,comprising about 2%of all intracranial *** it is a benign tumor,due to the abundant blood supply and its close relationship with adjacent cerebral blood vessels,surgical resection is difficult and may cause complications such as *** HB can be correctly diagnosed before surgery,complications can be avoided by methods such as vascular embolism before *** SUMMARY A 51-year-old male patient was admitted to our hospital because of blurred vision in his left eye for 2 *** examination revealed oculus dexter vision acuity of 1.0 and oculus sinister vision acuity of *** left vision had tubular visual field,while his right vision had a partial *** tomography and magnetic resonance imaging showed a mass lesion at the left anterior base of the skull,which could have been a *** the operation,the tumor was found to be located at the entrance of the left optic nerve tube,closely adhering to the left optic nerve and the blood supply was extremely *** tumor was carefully separated and diagnosed as HB postoperatively after pathological *** A rare HB at the anterior skull base could be distinguished by its imaging features,which is essential to the surgical procedures.

关键词： Hemangioblastoma Supratentorial Anterior skull base Diagnosis Magnetic resonance imaging Case report