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The effects of the rotor-stator interaction on unsteady pressure pulsation and radial force in a centrifugal pump

Journal of Hydrodynamics 2018年第4期30卷 672-681页

作者： issa Chalghoum Sami Elaoud Hatem Kanfoudi Mohsen Akrout Research Laboratory "Applied Fluid Mechanics Process and Environment Engineering" National Engineering School of Sfax Sfax Tunisia Research Laboratory "Laboratory of Hydraulics and Environment Modeling" National Engineering School of Tunis ENIT Hydraulic Engineering Tunis Tunisia

An unsteady numerical analysis has been conducted to study the strong interaction between impeller blade and volute tongue of a centrifugal pump. The 3-D-URANS equations were solved with the shear stress transport turbulence model for a wide range of flow rates. These unsteady interactions are mostly related to the unsteady radial force due to an imbalance in the pressure field at the impeller periphery. This force represents dynamic load that are one of the most important sources of vibration and hydraulic noise. Based on this phenomenon, this work analyzes and gives a more realistic prediction of the pressure fluctuation and the radial force during steady and unsteady calculation by considering the effect of the change in the pump operating point. Actually, the pressure fluctuations in the impeller and the volute were recorded by mounting nine monitoring points on the impeller and volute casing. The results of the existing analysis has proven that the pressure fluctuation is periodic due to the relative position of impeller blade to volute tongue. The characteristics of the time domain and frequency domain of the pressure pulsation were analyzed under different coupling conditions. Fast Fourier transform was performed to obtain the spectra of pressure pulsation. Besides, the steady and unsteady forces were calculated around the impeller periphery to fully characterize the pump behavior. The obtained pump performance curves were numerically compared with the experimental ones, and the outcome have shown an acceptable agreement between both curves.

关键词： Unsteady simulation blade-tongue interaction unsteady pressure distribution blade-passing frequency

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Liver Tumor Decision Support System on Human Magnetic Resonance Images:A Comparative Study

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Computer Systems Science & Engineering 2023年第8期46卷 1653-1671页

作者： Hiam alquran Yazan al-issa Mohammed alslatie Isam Abu-Qasmieh Amin alqudah Wan Azani Mustafa Yasmin Mohd Yacob Department of Biomedical Systems and Informatics Engineering Yarmouk University 556Irbid21163Jordan Department of Biomedical Engineering Jordan University of Science and TechnologyIrbid22110Jordan Department of Computer Engineering Yarmouk University 556Irbid21163Jordan The of Biomedical Technology King Hussein Medical CenterRoyal Jordanian Medical ServiceAmman11855Jordan Faculty of Electrical Engineering&Technology Campus Pauh PutraUniversiti Malaysia PerlisArau02600PerlisMalaysia Faculty of Electronic Engineering&Technology Campus Pauh PutraUniversiti Malaysia PerlisArau02600PerlisMalaysia Advanced Computing Centre of Excellence(CoE)Universiti Malaysia PerlisArau02600PerlisMalaysia

Liver cancer is the second leading cause of cancer death *** tumor detection may help identify suitable treatment and increase the survival *** imaging is a non-invasive tool that can help uncover abnormalities in human *** Resonance Imaging(MRI),in particular,uses magnetic fields and radio waves to differentiate internal human organs ***,the interpretation of medical images requires the subjective expertise of a radiologist and ***,building an automated diagnosis computer-based system can help specialists reduce incorrect *** paper proposes a hybrid automated system to compare the performance of 3D features and 2D features in classifying magnetic resonance liver tumor *** paper proposed two models;the first one employed the 3D features while the second exploited the 2D *** first system uses 3D texture attributes,3D shape features,and 3D graphical deep descriptors beside an ensemble classifier to differentiate between four 3D tumor *** top of that,the proposed method is applied to 2D slices for comparison *** proposed approach attained 100%accuracy in discriminating between all types of tumors,100%Area Under the Curve(AUC),100%sensitivity,and 100%specificity and precision as well in 3D liver *** the other hand,the performance is lower in 2D *** maximum accuracy reached 96.4%for two classes and 92.1%for four *** top-class performance of the proposed system can be attributed to the exploitation of various types of feature selection methods besides utilizing the ReliefF features selection technique to choose the most relevant features associated with different *** novelty of this work appeared in building a highly accurate system under specific circumstances without any processing for the images and human input,besides comparing the performance between 2D and 3D *** the future,the presented work can be extended to be

关键词： Liver tumors ensemble classifier 3D shape features 3D cooccurrence matrix ResNet101

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Tandem synthesis of functionalized hexaalkyl benzoisoquinolinopyrrolonaphthyridine-hexacarboxylate, via isoquinoline based multi-component reaction

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Chinese Chemical Letters 2013年第11期24卷 979-983页

作者： Mohammad Piltan issa Yavari Loghman Moradi Department of Chemistry Sanandaj Branch Islamic Azad University Chemistry Department Tarbiat Modares University Department of Chemistry Faculty of Science University of Kurdistan

An expedient,synthetic method to fused polycyclic derivatives of isoquinoline is described via tandem reaction of isoquinoline,dialkyl acetylenedicarboxylates and dialkyl chloromalonate.

关键词： Isoquinoline Tandem reaction Acetylenic esters Dialkyl chloromalonate

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Measure of Multifunctional Agriculture-Syrian Experts’ Perception

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Agricultural Sciences 2022年第3期13卷 429-437页

作者： Ahmad Jaddouh Yasser ali al-issa Agricultural Economic Department Faculty of Agriculture University of Aleppo Aleppo Syria

Multifunctionality, as a feature of agriculture, is subject to different interpretations, depending on the state and context. The core concept of Multifunctionality of Agriculture (MFA) is that the agricultural sector has multiple roles. These roles are not confined to food and fiber production, but also to the provision of several non-market commodities. In this study, we have interviewed 30 Syrian experts from different fields of sciences so as to examine their understanding of the concept of multifunctional agriculture and its elements and look closely into the importance of the elements of MFA in Syrian agricultural policy context from an expert’s point of view. The results show that wider roles of agriculture are highly acknowledged among the chosen experts but few of them are working on it. In its broadest sense, no undivided acceptance of the concept of multifunctionality has been found. The Syrian agriculture policies have elements which support and improve MFA, but it is not clearly recognized as such.

关键词： Multifunctional Agriculture Delphi Method Agricultural Policy Syrian Arab Republic

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Chimeric Antigen Receptors and Regulatory T Cells:The Potential for HLA-Specific Immunosuppression in Transplantation

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Engineering 2022年第3期8卷 30-43页

作者： Sabrina Wright Conor Hennessy Joanna Hester Fadi issa Nuffield Department of Surgical Sciences University of OxfordOxford OX39DUUK

Chimeric antigen receptors(CARs)are a breakthrough in genetic engineering that have revolutio nized the field of adoptive cellular therapy(ACT).Cells expressing these receptors are rerouted to a predefined target by the inclusion of an antigen-specific binding region within the synthetic CAR *** advantage of cells with programmed specificity has been demonstrated clinically in the field of oncology,and it is clear that such cells have greater accuracy,potency,and reduced off-target therapeutic effects compared with their unmodified *** contrast to conventional T cells(Tconvs),regulatory T cells(Tregs)play a major role in suppressing immune activation and regulating the host immune *** expression within Tregs has been proposed as a therapy for autoimmune and inflammatory diseases,graft-versus-host disease(GVHD),and organ transplant rejectio *** the latter,they hold immense potential as mediators of immune tolerance for recipients of ***,current research into CAR-Treg engineering is extremely limited,and there is uncertainty regarding optimal design for therapeutic *** review examines the rationale behind the development of CAR-Tregs,their significance for human transplantation,potential designs,safety considerations,and comparisons of CAR-Tregs in transplantation models to date.

关键词： Chimeric antigen receptors T cell Treg alloimmunity Bioengineering Transplant Autoimmunity

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Hepatitis B Surface Antigen and Hepatitis C Virus Antibodies among Drug Users in Burkina Faso

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Advances in Microbiology 2024年第1期14卷 92-104页

作者： Sylvie Zida Kadari Cissé Odette Ky-Zerbo Dinanibè Kambiré Serge Théophile Soubeiga Simon Tiendrebéogo Fatou Sissoko issa Sory Célestine Ki-Toé Solange Dioma Djeneba Zorom Adama Ouédraogo Cedric Dimitri Axon Hien Mahamoudou Sanou Seni Kouanda Henri Gautier Ouédraogo Institut de Recherche en Sciences de la Santé Ouagadougou Burkina Faso Dé partement de G&eacuteographie Universit&eacute Norbert ZONGO Koudougou Burkina Faso Secré tariat permanent du Conseil national de lutte contre le Sida et les IST (SP/CNLS-IST) Ouagadougou Burkina Faso Initiative Privé e et Communautaire pour la Sant&eacute et la Riposte au VIH/SIDA au Burkina Faso (IPC/BF) Ouagadougou Burkina Faso Unité de Formation et de Recherche en Sciences de la Sant&eacute (UFR-SDS) Universit&eacute Joseph KI-ZERBO Ouagadougou Burkina Faso

Introduction: The epidemiology of both hepatitis B virus (HBV) and hepatitis C virus (HCV) infections among drug users (DUs) is little known in West Africa. The study aimed to assess the prevalence of hepatitis B and C viruses among drug users in Burkina Faso. Methodology: This was a cross-sectional biological and behavioral survey conducted between June and August 2022, among drug users in Ouagadougou and Bobo Dioulasso, the two main cities of Burkina Faso. A respondent-driven sampling (RDS) was used to recruit drug users. Hepatitis B surface antigen was determined using lateral flow rapid test kits and antibodies to hepatitis C virus in serum determined using an Enzyme-Linked Immunosorbent Assay. Data were entered and analyzed using Stata 17 software. Weighted binary logistic regression was used to identify the associated factors of hepatitis B and C infections and a p-value Results: A total of 323 drug users were recruited with 97.5% males. The mean age was 32.7 years old. The inhaled or smoked mode was the most used by drug users. The adjusted hepatitis B and hepatitis C prevalence among study participants were 11.1% and 2.3% respectively. The marital status (p = 0.001), and the nationality (p = 0.011) were significantly associated with hepatitis B infection. The type of drug used was not significantly associated with hepatitis B infection or hepatitis C infection. Conclusion: The prevalence of HBsAg and anti-HCV antibodies among DUs are comparable to those reported in the general population in Burkina Faso. This result suggests that the main routes of contamination by HBV and HCV among DUs are similar to those in the population, and could be explained by the low use of the injectable route by DUs in Burkina Faso.

关键词： Drug Users Hepatitis C Hepatitis B Prevalence Burkina Faso

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Effect of granulated rubber on shear strength of fine-grained sand

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第5期9卷 936-944页

作者： Seyed Mahmoud Anvari issa Shooshpasha Saman Soleimani Kutanaei Department of Civil Engineering Babol University of Technology Babol Iran

Review of the literature related to the mixture of shredded tire and sand shows that,despite of the increase in shear strength due to addition of tire chips,granulated rubber causes reduction in shear strength of *** this study,the shear behavior of mixtures of fine-grained sand and 1-5 mm granulated rubber is *** direct shear tests were conducted on sandegranulated rubber mixtures with various rubber contents(0%,5%,10%,20% and 30%) at different relative densities(50%,70% and 90%) and different normal stresses(34.5 kPa,54.5 kPa,74.5 kPa and 104.5 kPa).The obtained results show that the granulated rubber improves the shear strength of fine-grained sand at medium relative density and low normal *** degree of improvement in shear strength is a function of rubber content,relative density and normal *** results show that at relative density of 50%,by adding 5% granulated rubber,the internal friction angle of sand increases from 35.1° to 39.2°.However,at relative densities of 70% and 90%,addition of granulated rubber to sand decreases its internal friction *** results also indicate that the behavior of sand becomes more ductile with increasing granulated rubber *** granulated rubber leads to greater yielding strain and less tangent stiffness of *** maximum dilation angle decreases with the decrease in granulated rubber *** stress ratio of sample at critical state(ψ= 0°) decreases with increasing granulated rubber content.

关键词： Granulated rubber Fine-grained sand Relative density Shear strength

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Isoquinoline-mediated 5-vinylation and N-vinylation of benzo[d]oxazole-2-thiol and benzo[d]thiazole-2-thiol

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Chinese Chemical Letters 2012年第1期23卷 5-8页

作者： issa Yavari Samira Nasiri-Gheidari Anvar Mirzaei Department of Chemistry Tarbiat Modares UniversityPO Box 14115-175TehranIran

An effective route to 5-vinylated and N-vinylated benzo[d]oxazole-2（3H）-thiones and benzo[d]thiazole-2（3H）-thiones is described via reaction of acetylenic esters and benzo[d]oxazole-2-thiol and benzo[d]thiazole-2-... 详细信息

关键词： S-Vinylation N-Vinylation Acetylenic esters Benzo[d]oxazole-2-thiol Benzo[d]thiazole-2-thiol Isoquinoline

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Synthesis of functionalized azadienes from aminobenzothiazole,acetylenic esters and isocyanides

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Chinese Chemical Letters 2012年第1期23卷 49-52页

作者： issa Yavari Samira Arab-Salmanabadi ali Aminkhani Department of Chemistry Science and Research BranchIslamic Azad UniversityTehranlran

The reaction between 2-aminobenzothiazole with dialkyl acetylenedicarboxylates in the presence of isocyanides,leads to functionalized azadienes in good yields.

关键词： Aminobenzothiazole Azadiene Isocyanide Zwitterionic intermediate

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Influence of zeolite and cement additions on mechanical behavior of sandy soil

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第5期8卷 746-752页

作者： Hossein Mola-Abasi issa Shooshpasha Geotechnical Department Babol University of Technology

It is well known that the cemented sand is one of economic and environmental topics in soil stabilization. In this instance, a blend of sand, cement and other materials such as fiber, glass, nanoparticle and zeolite can be commercially available and effectively used in soil stabilization in road construction. However, the influence and effectiveness of zeolite on the properties of cemented sand systems have not been completely explored. In this study, based on an experimental program, the effects of zeolite on the characteristics of cemented sands are investigated. Stabilizing agent includes Portland cement of type II and zeolite. Results show the improvements of unconfined compressive strength （UCS） and failure properties of cemented sand when the cement is replaced by zeolite at an optimum proportion of 30% after 28 days. The rate of strength improvement is approximately between 20% and 78%. The efficiency of using zeolite increases with the increases in cement amount and porosity. Finally, a power function of void-cement ratio and zeolite content is demonstrated to be an appropriate method to assess UCS of zeolite-cemented mixtures.

关键词： ZeoliteCemented sand StrengthUnconfined compressive strength (UCS) Void-cement ratio

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