检索结果-南通市图书馆

Generalized Besov Type Spaces on the Dual of the Laguerre Hypergroup

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 Mathematica Sinica,English Series 2009年第9期25卷 1543-1560页

作者： miloud ASSAL Département de Mathématiques Faculté des Sciences de Bizerte Jarzouna - Bizerte - 7021

In this paper we introduce the homogeneous Besov type spaces ∧p,q^γ（K） on the dual of Laguerre hypergroup K and we establish some new harmonic analysis results. We give some character- izations of these spaces using equivalent seminorms. Also we study the non-homogeneous Besov type spaces ∧p,q^γ（K）. We give some properties of these spaces and embeddings results with respect to their parameters p, q and γ.

关键词： Laguerre hypergroup Besov type spaces Calderón-reproducing formula

Effect of Coriolis and centrifugal forces on flow and heat transfer at high rotation number and high density ratio in non orthogonally internal cooling channel

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2017年第1期30卷 216-234页

作者： Brahim Berrabah miloud Aminallah Department of Mechanical Engineering Materials and Reactive Systems Laboratory Faculty of Technology Djillali Liabes University Sidi Bel-Abbes 22000 Algeria

Numerical predictions of three-dimensional flow and heat transfer are performed for a two-pass square channel with 45° staggered ribs in non-orthogonally mode-rotation using the second moment closure model. At Reynolds number of 25,000, the rotation numbers studied were 0,0.24, 0.35 and 1.00. The density ratios were 0.13, 0.23 and 0.50. The results show that at high buoyancy parameter and high rotation number with a low density ratio, the flow in the first passage is governed by the secondary flow induced by the rotation whereas the secondary flow induced by the skewed ribs was almost distorted. As a result the heat transfer rate is enhanced on both co-trailing and co-leading sides compared to low and medium rotation number. In contrast, for the second passage, the rotation slightly reduces the heat transfer rate on co-leading side at high rotation number with a low density ratio and degrades it significantly on both co-trailing and co-leading sides at high buoyancy parameter compared to the stationary, low and medium rotation numbers. The numerical results are in fair agreement with available experimental data in the bend region and the second passage, while in the first passage were overestimated at low and medium rotation numbers.

关键词： Blade cooling Computational FluidDynamic (CFD) Heat transfer High buoyancy parameter High rotation number

AN IMPROVED HARDY'S INEQUALITY

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2013年第5期33卷 1382-1386页

作者： Assal miloud Rahmouni ATEF Department of Mathematics Faculty of Science King Abdulaziz University Department of Mathematics Faculty of Sciences of Bizerte University of Carthage

In this paper we shall extend Hardy＇s inequality associated with Fourier trans- form to the strip n（2-p） ≤σ〈 n＋p（N＋ 1） where N = [n（1/p- 1）], the greatest integer not exceeding n（1/p - 1）.

关键词： Hardy's space Hardy's inequality

Finite element model for linear-elastic mixed mode loading using adaptive mesh strategy

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第1期9卷 32-37页

作者： miloud SOUIYAH Abdulnaser ALSHOAIBI A. MUCHTAR A.K. ARIFFIN Department of Mechanical & Materials Engineering Universiti Kebangsaan Malaysia Bangi Selangor 43600 Malaysia

An adaptive mesh finite element model has been developed to predict the crack propagation direction as well as to calculate the stress intensity factors （SIFs）, under linear-elastic assumption for mixed mode loading application. The finite element mesh is generated using the advancing front method. In order to suit the requirements of the fracture analysis, the generation of the background mesh and the construction of singular elements have been added to the developed program. The adaptive remeshing process is carried out based on the posteriori stress error norm scheme to obtain an optimal mesh. Previous works of the authors have proposed techniques for adaptive mesh generation of 2D cracked models. Facilitated by the singular elements, the displacement extrapolation technique is employed to calculate the SIK The fracture is modeled by the splitting node approach and the trajectory follows the successive linear extensions of each crack increment. The SlFs values for two different case studies were estimated and validated by direct comparisons with other researchers work.

关键词： Linear-elastic fracture mechanics Adaptive refinement Stress intensity factors (SIFs) Crack propagation

Heat Transfer Enhancement in a Parabolic Trough Solar Receiver using Longitudinal Fins and Nanofluids

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2016年第5期25卷 410-417页

作者： Amina Benabderrahmane miloud Aminallah Samir Laouedj Abdelylah Benazza J.P.Solano Laboratory of Reactive Systems and Materials DjiUali Liabes UniversitySidi Bel AbbesAlgeria Ingenieria Termica y de Fluidos Univcrsidad Politecnica de CartagenaCartagenaSpain

In this paper,we present a three dimensional numerical investigation of heat transfer in a parabolic trough collector receiver with longitudinal fins using different kinds of nanofluid,with an operational temperature of 573 K and nanoparticle concentration of 1% in *** outer surface of the absorber receives a non-uniform heat flux,which is obtained by using the Monte Carlo ray tracing *** numerical results are contrasted with empirical results available in the open literature.A significant improvement of heat transfer is derived when the Reynolds number varies in the range 2.57×104≤ Re≤ 2.57×105,the tube-side Nusselt number increases from 1.3 to 1.8 times,also the metallic nanoparticles improve heat transfer greatly than other nanoparticles,combining both mechanisms provides better heat transfer and higher thermo-hydraulic performance.

关键词： numerical study Monte Carlo ray trace parabolic trough collector heat transfer longitudinal fins nanofluid

Antihydatic and immunomodulatory effects of Algerian propolis ethanolic extract:In vitro and in vivo study

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2019年第3期12卷 106-116页

作者： Nahla Deghbar Dalila Mezioug Touri Kahina Yacine-miloud Medjdoub Chafia Touil-Boukoffa Cytokines and NO Synthases-Immunity and Pathogeny team Laboratory of Cellular and Molecular Biology Faculty of Biological Sciences University of Sciences and Technology Houari Boumediene Department of Thoracic Surgery Mustapha Pacha Hospital

Objective: To evaluate the in vitro and in vivo effect of the Algerian propolis ethanolic extract(EEP) against Echinococcus granulosus(E. granulosus) infection. Methods: In vitro scolicidal activity of EEP was investigated on the protoscolices of hydatid cyst. This in vitro study was conducted by using an in vivo assay. BALB/c mice were inoculated with E. granulosus and treated with propolis for three months. Hydatid cysts development was assessed. Nitric oxide(NO), tumor necrosis factor alpha(TNF-α) production and inducible NO synthase, NF-κB, and TNF-α spleen expression were estimated by Griess method and immunofluorescence ***: Our study revealed that EEP has a high scolicidal activity against E. granulosus. Oral administration of EEP decreased TNF-α, NF-κB and inducible NO synthase expression in the spleen tissues in the CE+EEP group, in comparison with the CE group. Concomitantly, EEP treatment caused an important systemic decrease in NO and TNF-α levels. These findings are associated with the reduction of CE development. Conclusions: This is the first report demonstrating with interest the antihydatic and immunomodulatory effects of the Algerian EEP, suggesting its therapeutic potential for the hydatid disease treatment.

关键词： Cystic echinococcosis Algerian propolis Antihydatic effect Immunomodulatory effect

Mechanisms for the Application of Health Services Marketing Policies in Algeria

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 Accounting and Auditing 2012年第6期8卷 845-855页

作者： Dr.miloud Toumi University of Mohamed Khidher Biskra Algeria

In this paper, we tried to give health services marketing mix and raise patients＇ interest in health services with the contribution to highlighting the possible application mechanisms of different marketing policies on health services in Algeria. Because we see that, health foundations in Algeria like other foundations live in an environment marked with constantly economic, social, politic, and cultural changes. And to respond to change requirements, especially with the appearance of health services market liberation signs, these foundations are obliged to adapt to ensure their existence and development by giving best services to meet the patients＇ needs in order to gain their satisfaction and loyalty. These ones, who became more conscious about the quality of services they are given quantitatively, qualitatively, and timely.

关键词： economy of health health services service marketing policies health services marketing policies totalquality management

Asymptotic Analysis of Linear and Interval Linear Fractional-Order Neutral Delay Differential Systems Described by the Caputo-Fabrizio Derivative

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics 2020年第12期11卷 1229-1242页

作者： Ann Al Sawoor miloud Sadkane Laboratoire de Mathématiques de Bretagne Atlantique CNRS-UMR 6205 Université de Brest Brest Cedex 3 France

Asymptotic stability of linear and interval linear fractional-order neutral delay differential systems described by the Caputo-Fabrizio (CF) fractional derivatives is investigated. Using Laplace transform, a novel characteristic equation is derived. Stability criteria are established based on an algebraic approach and norm-based criteria are also presented. It is shown that asymptotic stability is ensured for linear fractional-order neutral delay differential systems provided that the underlying stability criterion holds for any delay parameter. In addition, sufficient conditions are derived to ensure the asymptotic stability of interval linear fractional order neutral delay differential systems. Examples are provided to illustrate the effectiveness and applicability of the theoretical results.

关键词： Fractional Calculus Caputo-Fabrizio Fractional Derivative Neutral Delay Differential Systems Asymptotic Stability

Study of the Mechanical Performance of a Recycled Aggregate Concrete with Admixture Addition

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Civil Engineering 2013年第2期3卷 99-103页

作者： Larbi Belagraa miloud Beddar Department of Civil Engineering M’Sila University M’Sila Algeria Laboratory of Materials and Electronic Systems (LMSE) Faculty of Sciences and Technology Bordj Bou Arreridj University Bordj Bou Arreridj Algeria

The needs of the construction sector are still increasing for concrete. However the shortage of natural resources of aggregate could be a problem for the concrete industry. In addition, the negative impact on the environment is due to the construction demolition;where disposal wastes create a severe ecological and environmental hazard. In the last decade, a major interest has been developed for the reuse of recycled aggregates that present more than 70% of the concrete volume. The reused products should fulfill the requirements of lower cost and better quality, in order to establish its role in the concrete. The aim of this study is to assess the effect of the local admixtures on the mechanical behavior of recycled aggregate concrete (RAC). Physical and mechanical properties of RAC were investigated including density, compressive and flexural strength. The non-destructive test methods (NDT: pulse-velocity and rebound hammer) were used to determine the concrete strength. The results obtained were compared with crushed aggregate concrete (CAC) using the normal compressive testing machine test method. Thus, the convenience of indirect tests in the case of a recycled aggregate concrete were demonstrated.

关键词： Recycled Concrete Aggregate Demolition Waste Non-Destructive Tests Mechanical Strength Admixture