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A numerical analysis on different-generation prototypes of ventricular assist device

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International Journal of Modeling, Simulation, and Scientific Computing 2019年第5期10卷 34-42页

作者： ali tavakoli Golpaygani Kamran Hassani alireza Karimi Amin Nokhbe Zaeim Department of Biomedical Engineering Standard Research Institute KarajIran Department of Biomechanics Science and Research Branch Islamic Azad UniversityTehranIran Department of Mechanical Engineering Kyushu University 744 MotookaNishi-kuFukuoka 819-0395Japan

The ventricular assist device(VAD)assists the patients with heart diseases for limited and prolonged *** device synchronizes with normal heart activities to help foster its ***,its sensitive design requires high *** pumps are the essential part of every VAD which should operate in wide ranges of flow and *** there are various types of VAD under different designs,it is neither practical nor plausible to experimentally/clinically investigate their ***,in the concurrent study,a numerical study was carried out on four different generation prototypes of VAD pumps for reaching an optimum *** computational fluid dynamics(CFD)method,the software derived,showed and streamlined the flow field shear stress both inside the VAD and its ***,the vortices and flow rate-pressure curves were *** results showed that the curved blade pumps operate better compared to that of the straight blade types,concerning the provision of enough pressure and less damage to the red blood *** results have implications not only for comparing different types of VAD designs but also for understanding the resulted shear stresses and pressures as a result of the blade’s structure.

关键词： Pump generation CFD ventricular assist device numerical simulation ventricular blade

Detection and identification of S1 and S2 heart sounds using wavelet decomposition method

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International Journal of Biomathematics 2015年第6期8卷 141-155页

作者： ali tavakoli Golpaygani Nahid Abolpour Kamran Hassani D. John Doyle Biomedical Engineering DepartmentFaculty of Electrical Mechanical and Construction Engineering Standard Research Institute Karaj Iran Department of Physics and Biomedical EngineeringShiraz University of Medical Sciences Shiraz Iran Department of Biomechanics Science and Research Branch Islamic Azad University Tehran Iran Department of General AnesthesiologyAnesthesiology Institute Cleveland Clinic Abu Dhabi Abu Dhabi UAE

Phonocardiogram （PCG）, the digital recording of heart sounds is becoming increasingly popular as a primary detection system for diagnosing heart disorders and it is relatively inexpensive. Electrocardiogram （ECG） is used during the PCG in order to identify the systolic and diastolic parts manually. In this study a heart sound segmentation algorithm has been developed which separates the heart sound signal into these parts automa- tically. This study was carried out on 100 patients with normal and abnormal heart sounds. The algorithm uses discrete wavelet decomposition and reconstruction to pro- duce PCG intensity envelopes and separates that into four parts： the first heart sound, the systolic period, the second heart sound and the diastolic period. The performance of the algorithm has been evaluated using 14,000 cardiac periods from 100 digital PCG recordings, including normal and abnormal heart sounds. In tests, the algorithm was over93% correct in detecting the first and second heart sounds. The presented automatic seg- mentation Mgorithm using w^velet decomposition and reconstruction to select suitable frequency band for envelope calculations has been found to be effective to segment PCG signals into four parts without using an ECG.

关键词： Phonocardiography auscultation murmurs wavelet decomposition waveletreconstruction segmentation.

Study of relation between the gamma flux buildup factors and source geometry by M-C simulation

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Nuclear Science and Techniques 2017年第9期28卷 31-35页

作者： ali Rasouli Hossein tavakoli-Anbaran Faculty of Physics Shahrood University of Technology

This paper is to achieve a gamma-ray source with the lowest rate of buildup factor, which is of great importance in medical, industrial and agricultural *** flux buildup factor of gamma rays is calculated by the MCNP code for point, linear, surface and volume sources with shield layers of lead, iron and aluminum. The results show that for the high Z shielding material, the flux buildup factor of coaxial cylindrical sources is the lowest(1.6–2.3)of all sources, while for low Z shielding materials, the coaxial disk surface sources have smaller buildup factor(1.45–1.6).

关键词：通量几何模拟增强因子 γ射线源农业科学 MCNP 伽马射线

Moisture-dependent physical properties of barley grains

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International Journal of Agricultural and Biological Engineering 2009年第4期2卷 84-91页

作者： Mahmoud tavakoli Hamed tavakoli ali Rajabipour Hojat Ahmadi Seyed Mohammad Taghi Gharib-Zahedi Department of Food Science and Technology Faculty of AgricultureUniversity of ZabolZabolIran Department of Agricultural Machinery Engineering Faculty of Agricultural Engineering&TechnologyUniversity of TehranP.O.Box 4111Karaj 31587-77871Iran Department of Food Science and Engineering Faculty of Agricultural Engineering&TechnologyUniversity of TehranKarajIran

Designing equipment for processing,sorting,sizing and other post-harvest operations of agricultural products requires information about their physical *** study was carried out to evaluate the effect of moisture content on some physical properties of barley *** levels of moisture content ranging from 7.34%to 21.58%(d.b.)were *** average length,width,thickness,arithmetic mean diameter,geometric mean diameter,thousand grain mass,sphericity,surface area and repose angle increased from 8.91 to 9.64 mm,3.30 to 3.74 mm,2.58 to 2.98 mm,4.93 to 5.45 mm,4.23 to 4.75 mm,44.48 to 51.30 g,47.55%to 49.35%,56.66 to 71.09 mm2 and 31.16°to 36.90°,respectively,as moisture content increased from 7.34%to 21.58%(d.b.).The bulk density,true density and porosity were found to decrease with increasing moisture *** static friction coefficient of the grains increased linearly against various surfaces(plywood,glass and galvanized iron sheet)as the moisture content *** all moisture content,the maximum friction was offered by plywood,followed by galvanized iron sheet and glass surface.

关键词： barley moisture content angle of repose coefficient of friction

A comprehensive review of renewable energy resources for electricity generation in Australia

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Frontiers in Energy 2020年第3期14卷 510-529页

作者： alireza HEIDARI ali ESMAEEL NEZHAD Ahmad tavakoli Navid REZAEI Foad H.GANDOMAN Mohammad Reza MIVEH Abdollah AHMADI Majid MALEKPOUR School of Electrical Engineering and Telecommunications The University of New South WalesSydney 2052Australia Department of Electrical Electronicand Information EngineeringUniversity of BolognaBologna 40126Italy Lloy's Register Melbourne 3000Australia Department of Electrical Engineering University of KurdistanSanandaj ***Iran Research group MOBI-Mobility Logisticsand Automotive Technology Research CenterVrije Universiteit BrusselPleinlaan 2Brussels 1050BelgiumFlanders Make 3001HaverleeBelgium MIVEH Department of Electrical Engineering Tafresh UniversityTafresh 39518-79611Iran

Recently,renewable energy resources and their impacts have sparked a heated debate to resolve the Australian energy *** are many projects launched throughout the country to improve network security and *** paper aims to review the current status of different renewable energy resources along with their impacts on society and the ***,it provides for the first time the statistics of the documents published in the field of renewable energy in *** statistics include information such as the rate of papers published,possible journals for finding relative paper,types of documents published,top authors,and the most prevalent keywords in the field of renewable energy in *** will focus on solar,wind,biomass,geothermal and hydropower technologies and will investigate the social and environmental impacts of these technologies.

关键词： renewable energy hydro energy wind power photovoltaic geothermal bioenergy

Evaluation of microRNA-146a expression in acute lymphoblastic leukemia

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Frontiers in Biology 2016年第1期11卷 53-58页

作者： Farzaneh tavakoli Kaveh Jaseb Mohammad ali Jalali Far Masoud Soleimani Elahe Khodadi Najmaldin Saki Health Research Institute Research Center of Thalassemia & Hemoglobinopathy Ahvaz Jundishapur University of Medical Sciences Ahvaz Iran Department of hematology School of Medical Sciences Tarbiat Modares University Tehran Iran

MicroRNAs （miRNAs） play an essential role in the development and progression of acute lymphoblastic leukemia （ALL）, and could serve as disease biomarkers and therapeutic targets. The function of miR-146a in lymphoid differentiation has been here with discussed. However, the role of this miRNA in the outcome of ALL is not well understood. Peripheral blood of 48 patients with ALL and 20 age- and sex-matched healthy control subjects was used to accurately evaluate the expression of miR-146a by stem-loop Real time PCR. No statistically significant difference was found between patients and controls in total miR-146a expression. The expression of miR-146a was high （18.75%）, low （27.08~o） and not different （54.17%） in ALL patients. Our analysis indicated no association between the expression of miR-146a and any prognostic factors such as WBC/PLT counts, Hb, fusion genes （P190 and some translocations） with ALL type. This study revealed that miR-146a cannot be an independent factor for predicting the outcome of ALL patients. We suggest a multi-parameter analysis including miRNAs, transcription factors and critical genes to achieve a precise clinical panel for prognostic values.

关键词： miR-146a acute lymphoblastic leukemia prognostic marker

Thermal Analysis Simulation of Germanium Zone Refining Process Assuming a Constant Radio-Frequency Heating Source

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Chinese Physics Letters 2016年第5期33卷 123-126页

作者： Mahdi Ezheiyan Hossein Sadeghi Mohammad-Hossein tavakoli Department of Physics Malek-Ashtar University of Technology Department of Physics Bu-Ali Sina University

Three-dimensional thermal a nalysis simulation of a horizontal zone refining system is conducted for germanimn semiconductor materials. The considered geometry includes a g＇ral）hite boat filled with germanium placed in a cylindrical quartz tube. A flow of Ar and H2 gas mixture is purged througll the tube. A narrow section of the, boat is assmned to be exposed to a constant heat rate produced b v an rf coil located outside the quartz tube. The results of this analysis provide essential information about various parameters such as the shape of tile molten zone, required power and temperature gradient in the system.

关键词： of on Thermal Analysis Simulation of Germanium Zone Refining Process Assuming a Constant Radio-Frequency Heating Source in is for

Computational Study of Electromagnetic Fields,Eddy Currents and Induction Heating in Thin and Thick Workpieces

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Communications in Computational Physics 2010年第6期8卷 211-225页

作者： Mohammad Hossein tavakoli Hossein Karbaschi Feridoun Samavat Physics Department Bu-Ali Sina UniversityHamedan 65174Iran

A set of 2D steady state finite element numerical simulations of electromagnetic fields,eddy currents distribution and induction heating pattern has been done for different thicknesses of a metal *** between the calculation results show the importance of workpiece thickness on induction heating process including electromagnetic field distribution,eddy currents pattern,heating structure and coil efficiency.

关键词： Computer simulation finite element analysis modeling induction heating metals

Experimental study on bearing capacity of shell strip footings near geotextile-reinforced earth slopes

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Journal of Central South University 2021年第8期28卷 2527-2543页

作者： Seyed ali GHAFFARI Elham SATTARI Amir HAMIDI Gholamhosein tavakoli MEHRJARDI Abtin FARSHI HOMAYOUN ROOZ Department of Civil Engineering School of EngineeringKharazmi UniversityTehranIran

From a financial point of view,urbanization frequently enforces the clients to construct superstructures near the slopes,giving rise to increasing the risk of building *** conducting a series of small-scale plate load tests,this work aims to investigate the effects of installing geotextile reinforcement layers in sandy slope and reducing the apex angle of triangular shell strip *** results show considerable effect of using geotextile-reinforced layers and decreasing the apex angle on the ultimate bearing capacity of shell *** increasing foundation distance from the slope,the adverse effect of the slope is ***,as the distance decreases,the effect of reinforcement and apex angle is *** practical applications,empirical equations are also presented for determining the ultimate bearing capacity of the footings and scale effect as ***,3D numerical simulations are executed and compared with the experimental results.

关键词： slope shell strip footing geotextile-reinforced apex angle ultimate bearing capacity numerical simulation