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Chinese Physics B 2018年第4期27卷 357-362页

作者： Erfan kadivar Mojtaba Farrokhbin Department of Physics Shiraz University of Technology Department of Physics Faculty of SciencesYazd University

Motivated by our recent work,in this work,we present the numerical study of the anchoring effect on the Frederiks threshold field in a nematic liquid crystal doped with ferroelectric colloidal *** weak anchoring conditions,we employ the relaxation method and Maxwell construction to numerically solve the Euler–Lagrangian differential equation for the total free energy together the Rapini–Papoular surface energy to take into account anchoring of nematic liquid crystal molecules at the *** this study,we focus our attention on obtaining the phase diagrams of Frederiks transition for different values of anchoring strength which have been not computed in our previous *** this way,the effect of nanoparticle radius,nanoparticle volume fraction,nanoparticle polarization,and cell thickness on the Frederiks transition for different values of anchoring conditions are summarized in the phase *** numerical results show that by increasing the nanoparticles size and nanoparticle volume fraction in the ferronematic system,the Frederiks threshold field is strongly reduced.

关键词： anchoring surface effect ferronematics Frederiks transition Maxwell construction

An experimental investigation of transient cavitation control on a hydrofoil using hemispherical vortex generators

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Journal of Hydrodynamics 2021年第6期33卷 1139-1147页

作者： Ebrahim kadivar Takaho Ochiai Yuka Iga Ould el Moctar Ship Technology Ocean Engineering and Transport SystemsUniversity of Duisburg-EssenDuisburgGermany Institute of Fluid Scienece Tohoku UniversitySendaiJapan

Unsteady cavitation causes noise,damage,and performance decline in the marine engineering and fluid machinery ***,finding a method to control the cavitation and its destructive effects is important for the industrial *** this work,we proposed a passive method to control the unsteady behavior of transient cavitation at the medium Reynolds *** this aim,we performed an experimental study using a high-speed camera to analyze the effects of hemispherical vortex generators(VGs)on the cavitation dynamics around a hydrofoil *** addition,the pressure pulsations induced by the collapse of the cavity structures in the wake region of the hydrofoil were captured with a pressure transducer mounted on the wall downstream of the *** results showed that the instability behaviors of the cavity structures on the hydrofoil were mitigated using the proposed cavitation passive control *** addition,the pressure pulsations in the wake region of the hydrofoil were reduced *** can be concluded that the suppression of cavitation instabilities can improve the operating life and reliability of the marine and hydraulic systems.

关键词： Hydrodynamic cavitation cavitation passive control hemispherical vortex generators pressure pulsations high speed observation

利用Cu0/多壁碳纳米管纳米复合物修饰玻碳电极快速非酶法检测葡萄糖和果糖(英文)

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催化学报 2013年第6期34卷 1208-1215页

作者： Hajar SHEKARCHIZADEH Mahdi kadivar Ali A.ENSAFI Department of Food Science and Technology College of AgricultureIsfahan University of TechnologyIsfahan 84156-83111Iran Department of Chemistry Isfahan University of TechnologyIsfahan 84156-83111Iran

A nonenzymatic electrochemical sensor for glucose and fructose was fabricated that contained a glassy carbon electrode modified with a copper oxide (CuO)/multiwalled carbon nanotube (MWCNT) nanocomposite. The electrochemical properties of the CuO/MWCNT‐modified glassy carbon electrode were investigated. Two distinguishable anodic peaks were observed around 0.30 and 0.44 V corresponding to the oxidation of glucose and fructose, respectively, at the surface of the modified electrode. The detection limits for glucose and fructose were both 0.04 mmol/L. The sensor was used to simultaneously determine the concentrations of glucose and fructose in hydrolyzed sucrose samples, and to measure glucose in blood serum samples, demonstrating its potential as a nonenzymatic carbohydrate sensor.

关键词： Nonenzymatic detection Copper oxide Multiwalled carbon nanotube Modified glassy carbon electrode Glucose Fructose Simultaneous determination

Numerical Prediction of Laminar-to-Turbulent Transition Around the Prolate Spheroid

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Journal of Marine Science and Application 2021年第1期20卷 46-54页

作者： Erfan kadivar Ebrahim kadivar Seyed Morteza Javadpour Department of Physics Shiraz University of TechnologyShiraz 71555-313Iran Institute of Ship Technology Ocean Engineering and Transport SystemsUniversity of Duisburg-Essen47057 DuisburgGermany Department of Mechanical Engineering University of GonabadGonabadIran

In this work,the laminar-to-turbulent transition phenomenon around the two-and three-dimensional ellipsoid at different Reynolds numbers is numerically *** the present paper,Reynolds Averaged Navier Stokes(RANS)equations with the Spalart-Allmaras,SST k-ω,and SST-Trans models are used for numerical *** possibility of laminar-toturbulent boundary layer transition is summarized in phase diagrams in terms of skin friction coefficient and Reynolds *** numerical results show that SST-Trans method can detect different aspects of flow such as adverse pressure gradient and laminar-to-turbulent transition *** numerical results indicate that the laminar-to-turbulent transition location on the 6:1 prolate spheroid is in a good agreement with the experimental data at high Reynolds numbers.

关键词： Laminar-to-turbulent transition Shear stress transport turbulence model Skin fraction Three-dimensional ellipsoid

The effect of polymorphism in gene of insulin-like growth factor-Ⅰ on the serum periparturient concentration in Holstein dairy cows

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Asian Pacific Journal of Tropical Biomedicine 2012年第10期2卷 765-769页

作者： A Mirzaei H Sharifiyazdi MR Ahmadi T Ararooti A Rowshan Ghasrodashti a kadivar Department of Clinical Science School of Veterinary MedicineShiraz University Islamic Azad University Kazerun Branch Research Institute of Animal Embryo Technology Shahrekord University

Objective:To investigate the relationship between polymorphism within the 5'-untranslated region(5'-UTR)of IGF-I gene and its periparturient concentration in Iranian Holstein dairy ***:Blood samples(5 mL,n=37)were collected by caudal venipuncture from each animal into sample lubes containing the EDTA and DNA was extracted from *** order to measure ICF-I concentration the collection of blood samples(n=111)was also done at 14 d before calving(prepartum),25 and 45 d ***:We found evidence for a significant effect of C to T mutation in position 512 of IGF-I gene on its serum concentration in dairy cows in *** with CC genotype had significantly higher concentration(Mean-SD)of IGF-I at 14 d prepartum(91.8±18.1)μg/L compared to those with TT genotype(73.3±14.4)μg/L(P=0.04).A significant trend(quadratic)was found for IGF-I concentration,as higher in CC cows compared to ones with TT genotype,during the 14 d before calving to 45 d postpartum(P=0.01).Conclusions:We concluded that C/T transition in the promoter region of IGF-I gene can influence the serum concentration of ICF-I in periparturient dairy cows.

关键词： Polymorphism Insulin-like growth factor-Ⅰ(IGF-Ⅰ) Serum concentration Periparturient Dairy cows

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蓝牙与UART:互补配合,相辅相成

今日电子 2005年第9期 80-81页

作者： Sylvie kadivar Dong Nguyen 飞利浦半导体数据通信产品部

蓝牙是一种流行的无线通信标准。因其便捷、易用、并具有可满足当今快速扩展的移动与个人通信应用需求的带宽,该技术的集成在业内迅速扩展。根据2004年4月In-Stat/MDR发布的报告,未来支持蓝牙的应用将包括蜂窝电话、无绳电话、接入点、... 详细信息

蓝牙是一种流行的无线通信标准。因其便捷、易用、并具有可满足当今快速扩展的移动与个人通信应用需求的带宽,该技术的集成在业内迅速扩展。根据2004年4月In-Stat/MDR发布的报告,未来支持蓝牙的应用将包括蜂窝电话、无绳电话、接入点、台式电脑、笔记本电脑、内存卡、打印机、数码摄像机和数码相机、广泛的消费类设备(包括游戏、音箱、机顶盒与M P3播放机等),以及汽车与工业应用等。蓝牙支持无线点对点连接和LAN、移动电话网络、以太网及家庭网络设备等的无线接入。蓝牙可通过这些设备进行无线发射和接收。它通过一个主机系统和一个主机控制器接口(HCI)发送和接收发射的数据。目前,最流行的HCI是通用异步接收器与发射器(UART)和通信串行总线(USB)连接的,如图1所示。UART通常更受青睐,因其性能和数据吞吐率水平与USB接口相当,且传输协议较为简单,减少了软件开销,是一种更为经济高效的全硬件解决方案。预计很大比例的针对通信应用而开发的蓝牙芯片将在主控制器中包含UART。本文将考察U A R T作为一个界于主机与蓝牙芯片组/模块之间的桥接设备具有的优点。U A R T概述UART通常用于与串行输入和串行输出设备之间的通信...

关键词： UART 蓝牙 In-Stat/MDR 互补无线通信标准 MP3播放机通信应用笔记本电脑数码摄像机

整合MR成像的临床检查能够降低疑似阑尾炎的孕妇剖腹手术的阴性率:一项单机构的研究

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国际医学放射学杂志 2013年第3期 276-276页

作者： E.J.Rapp F.Naim K.kadivar A.Davarpanah D.Cornfeld 张文明 Department of Diagnostic Imaging Yale University School of Medicine

目的将剖腹手术阴性率（NLR）和穿孔率（PR）作为衡量标准,明确右下腹疼痛孕妇采用整合MR成像的临床检查是否能获得更好的结果。材料与方法这项回顾性研究获得了机构审查委员会的批准。收录了从1996年1月1日至2011年8月31日,已进行手术... 详细信息

目的将剖腹手术阴性率（NLR）和穿孔率（PR）作为衡量标准,明确右下腹疼痛孕妇采用整合MR成像的临床检查是否能获得更好的结果。材料与方法这项回顾性研究获得了机构审查委员会的批准。收录了从1996年1月1日至2011年8月31日,已进行手术治疗（n=82）或MRI检查（n=217）的共267例疑似阑尾炎的孕妇病人。相关超声和MRI结果被分类为真阳性、假阳性、真阴性、假阴性或结果不确定。根据MRI的应用情况,将病人分为应用MRI前和应用MRI后两个组别。两个组别分别计算NLR和PR,并采用Fisher精确概率检验进行统计分析,计算出MRI的敏感度、特异度、阳性预测值（PPV）、阴性预测值（NPV）。结果 MRI于2004年应用于临床诊断检查。从1996年—2003年,疑似阑尾炎的孕妇的NLR为55%（17/35）,PR为21%（3/14）。从2004年—2011年,NLR是29%（15/51）,PR为26%（9/35）。NLR下降47%[（55%29%）/55%],并有统计学意义（P=0.02）。PR的变化无统计学意义（P>0.99）。MRI诊断阑尾炎的敏感度、特异度、PPV和NPV分别为89%（17/19）、97%（187/193）、74%（17/23）、99%（187/189）。结论在本中心,将MRI检查列入疑似阑尾炎的孕妇的常规检查中能够降低47%的剖腹手术阴性率,而阑尾穿孔率没有显著变化。

关键词： MRI 敏感度孕妇 MR 阑尾炎肠疾病剖腹手术临床检查