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Interaction between compressibility and particulate suspension on peristaltically driven flow in planar channel

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Applied Mathematics and Mechanics(English Edition) 2017年第1期38卷 137-154页

作者： I.M.ELDESOKY S.I.ABDELSALAM R.M.ABUMANDOUR M.h.KAMEL K.VAFAI Department of Basic Engineering Sciences Faculty of EngineeringMenoufia UniversityMenoufia 32511Egypt Department of Mechanical Engineering University of CaliforniaCalifornia 92521U.S.A. Basic Science Department Faculty of EngineeringThe British University in EgyptCairo 11837Egypt Department of Engineering Mathematics and Physics Faculty of Engineering Cairo UniversityGiza 12613Egypt

The peristaltic pumping of a viscous compressible liquid mixed with rigid spherical particles of the same size in a channel is theoretically investigated. The momentum equations for the compressible flow are solved with a perturbation analysis. The analysis is carried out by duly accounting for the nonlinear convective acceleration terms for the fluid part on the wavy wall. The zeroth-order terms yield the Poiseuille flow, and the first-order terms give the Orr-Sommerfeld equation. The explicit expression for the net axial velocity is derived. The effects of the embedded parameters on the axial fluid velocity are studied through different engineering applications. The features of the flow characteristics are analyzed and discussed in detail. The obtained results are evaluated for various parameters associated with the blood flow in the blood vessels with diameters less than 5 500 μm, whereas the particle diameter has been taken to be 8 μm. This study provides a scope to evaluate the effect of the theory of two-phase flow characteristics with compressible fluid problems, and is helpful for understanding the role of engineering applications of pumping solid-fluid mixture by peristaltically driven motion.

关键词： two-phase flow peristaltic transport compressible liquid perturbation method

ThE GROWTh AND 1/4-ThEOREMS FOR STARLIKE MAPPINGS IN C^n

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Chinese Science Bulletin 1990年第5期35卷 357-359页

作者： CARL h. FITZ GERALD 龚昇 ROGER W. BARNARD Department of Mathematics University of California San Diego La Jolla CA 92093 USA University of Science and Technology of China Hefei 230026 PRC Department of Mathematics Texas Tech. University Lubbock Texas 79409 USA

ⅠMore than fifty years ago, henri Cartant ~j suggested that geometric function theory ofone complex variable should be extended to biholomorphic mappings of several complexvariables. In particular, he cited the special classes of starlike and convex mappings asappropriate topics for generalization. In noting some of the difficulties of generalization, hepointed out the Growth Theorem as one of the results that would not extend to thepolydisc (nor to the ball). Also, he observed that for normalized biholomorphic

关键词： starlike mapping convex mapping Koebe 1/4-Theorem.

Examining perception of job satisfaction and intention to leave among ICU nurses in China

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International Journal of Nursing Sciences 2015年第2期2卷 140-148页

作者： hong Tao Carol h.Ellenbecker Yuefeng Wang Ying Li University of Wisconsin Milwaukee College of NursingUSA University of Massachusetts Boston College of Nursing and Health SciencesUSA harbin Medical University DaQing Campus Nursing DepartmentChina Second Military Medical University College of Nursing800 Xiang Yin RoadShanghai 200433China

Objectives:Previous studies in China's Mainland found ICU nurses to be less satisfied with their jobs and more inclined to leave them than are nurses in other hospital *** aimed to determine ICU nurses'perspectives on the factors that influence job satisfaction and whether or not to continue working in the ***:Nine ICU nurses were asked five open-ended questions to elicit the nurses'perspectives on job satisfaction and intentions to *** were analyzed according to the process described by Knafl and Webster(1988).Core concepts were identified using the constant comparative ***:Two themes emerged as major influences on job dissatisfaction:1)stress experienced from excessive workload demands and the ICU work environment,and 2)a lack of respect and recognition for the nurses'*** themes emerged as major influences on job satisfaction:1)recognition of work,and 2)professional opportunities and relationships with *** effects of job satisfaction or dissatisfaction on the nurses'intentions to leave their jobs varied,although three categories were ***:For ICU nurses in China,sources of job dissatisfaction are potentially remedied with simple *** staffing is necessary but not sufficient for a positive work *** should address the factors that directly affect their nurses'levels of job satisfaction,as it will ultimately result in less staff turnover and greater patient care.

关键词： ICU nurses Job satisfaction Job dissatisfaction Intent to leave Working experience

Toward an operating speed profile model for rural two-lane roads in Egypt

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Journal of Traffic and Transportation Engineering(English Edition) 2016年第1期3卷 82-88页

作者： Ibrahim h.hashim Talaat A.Abdel-Wahed Yasser Moustafa Faculty of Engineering Menoufia University Faculty of Engineering Sohag University

The geometric design, especially the horizontal and vertical alignments, of rural two-lane highway facilities is considered one of the most important factors affecting the quality of traffic service and safety. A consistent highway geometric design is defined to be one that conforms to the driver＇s expectations. In order to calculate the main measures of design consistency, an accurate operating speed profile model for road alignment is needed. Studies have shown that operating speed models are country dependent due to varying demographics, driver attitudes, habits, etc. This paper develops a speed profile model for two-lane rural roads in Egypt. This includes the development of operating speed models for horizontal curves and tangents, as well as the study of the characteristics and relationships between acceleration and deceleration rates before and after horizontal curves. The study uses a desert rural two-lane, two-way road sections that connect the city of Sohag with the city of hurghada, in Upper Egypt. All geometric characteristics were obtained from high- way authority. Speed data regarding individual drivers traveling on selected two-lane rural road sections were sampled using an on-board GPS system. The study confirms the finding in previous research that curvature is the most important factor in determining the speed on horizontal curves. Moreover, tangent length is the most important factor in determining operating speeds at tangents. The acceleration and deceleration characteristics were derived to gain an understanding of the behavior of individual vehicles traveling through curves of varying radii and lengths as well as preceding tangent length. Several operating speed models were developed for tangents and curves as well as for acceleration and deceleration rates. Incredibly effective, these models can be used for design consistency evaluations.

关键词： Speed profile modelOperating speedConsistencyDeceleration and accelerationhorizontal curveTangent

Tensile properties of strain-hardening cementitious composites containing polyvinyl-alcohol fibers hybridized with polypropylene fibers

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Journal of Central South University 2018年第1期25卷 51-59页

作者： h.R.Pakravan M.Jamshidi Young Researchers and Elite Club Central Tehran Branch Islamic Azad University School of Chemical Engineering Iran University of Science and Technology (IUST)

Partially replacing polyvinyl-alcohol(PVA)fibers with polypropylene(PP)fibers in strain-hardening cementitious composites(fiber hybridization)modify certain mechanical properties of these *** hybridization based on the introduction of low-modulus hydrophobic polypropylene fibers improves the ductility and the strain-hardening behavior of the cementitious composites containing polyvinyl-alcohol fibers of different types(PVA-ShCC).Pull-out tests indicate that adding PP fibers increases the energy capacity of the hybrid composite with respect to the material containing only PVA fibers under tensile loading,and PP-fiber geometry(i.e.,section shape and length)is a key factor in enhancing the strain capacity.

关键词： polyvinyl-alcohol (PVA) strain-hardening cementitious composite (PVA-ShCC) fiber hybridization

Further results on stability criteria for T-S fuzzy systems with time-varying delay 36

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Further results on stability criteria for T-S fuzzy systems ...

Prediction of sand production onset in petroleum reservoirs using a reliable classification approach

第36届中国控制会议

作者： Yajuan Liu Ju h.Park S.M.Lee Department of Electrical Engineering Yeungnam University Department of Electronic Engineering Kyungpook National University

ISBN: (纸本)9781538629185

This paper studies the problem of stability for Takagi-Sugeno（T-S） fuzzy systems with time varying *** employing a new augmented Lyapunov-Krasovskii function,using the second-order Bessel-Legendre inequality and combining with reciprocally convex approach,some less conservative delay-dependent stability criteria are derived within the framework of linear matrix inequalities（LMIs）.Two numerical examples are proposed to illustrate the effectiveness and the improvement of the proposed method.

关键词： T-S fuzzy systems Time varying delay Inequality inequality Lyapunov method

来源： cnki会议评论

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Petroleum 2017年第2期3卷 280-285页

作者： Farhad Gharagheizi Amir h.Mohammadi Milad Arabloo Amin Shokrollahi Department of Chemical Engineering Texas Tech UniversityLubbockTXUnited States Thermodynamics Research Unit School of EngineeringUniversity of KwaZulu-NatalHoward College CampusKing George V AvenueDurban4041South Africa Institut de Recherche en Genie Chimique et Petrolier(IRGCP) Paris CedexFrance Departement de Genie des Mines de la Metallurgie et des MateriauxFaculte des Sciences et de GenieUniversite LavalQuebec(QC)G1V 0A6Canada Young Researchers and Elites Club North Tehran BranchIslamic Azad UniversityTehranIran

Controlling sand production in the petroleum industry has been a long-standing problem for more than 70 *** provide technical support for sand control strategy,it is necessary to predict the conditions at which sanding *** this end,for the first time,least square support machine(LSSVM)classification approach,as a novel technique,is applied to identify the conditions under which sand production *** model presented in this communication takes into account different parameters that may play a role in *** performance of proposed LSSVM model is examined using field data reported in open *** is shown that the developed model can accurately predict the sand production in a real *** results of this study indicates that implementation of LSSVM modeling can effectively help completion designers to make an on time sand control plan with least deterioration of production.

关键词： Sand production Least square SVM ROC graph Classification description Modeling Sanding onset

Fuzzy control of electro-mechanical gearbox actuator

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中南大学学报（自然科学版） 2003年第Z1期34卷 113-117页

作者： G Iordanidis P h Mellor D holliday P M Churn Department of Electrical and Electronic Engineering University of Bristol Bristol BS8 1UB UK

In this paper, a prototype direct-drive electro-mechanical actuator is proposed to select gears in a high performance gearbox. Because of the nonlinear behavior of the actuator, a fuzzy logic controller is adopted. The result of simulation has proved that the dynamic response obtained using the fuzzy controller is much faster than that obtained using traditional PD controller.

关键词： actuator PD controller fuzzy logic controller

hIGh PRESSURE SYNThESIS OF hIGh T_(c)A15 Nb_(3)Si

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Chinese Physics Letters 1987年第1期4卷 44-46页

作者： WANG Yaoji WANG Wenkui hE Shouan h.Iwasaki Institute of Physics Academia SinicaBeijing The Research Institute for Iron Steel and Other MetalsTohoku UniversityJapan

The A15 Nb_(3)Si with a smaller lattice parameter(a=0.5093nm)has been synthesized from the amorphous Nb_(77)Si_(23) alloy under high pressure by using Bridgman anvils *** measurements shoued that the A15 phase produce... 详细信息

关键词： alloys. alloy (3)