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Persistent alanine aminotransferase elevation among the general Iranian population: Prevalence and causes

World Journal of Gastroenterology 2008年第18期14卷 2867-2871页

作者： Raika Jamali Mahmoodreza Khonsari Shahin Merat Masoud Khoshnia Elham Jafari Alireza Bahram Kalhori Hassan Abolghasemi Sedighe Amini Mahtab Maghsoudlu Mohammad Reza Deyhim houri rezvan Akram Pourshams Digestive Disease Research Center Shariati Hospital Medical Sciences/University of Tehran Tehran 14117 Iran Department of Internal Medicine Hamadan Hamadan University of Medical Sciences Iran Department of Radiology Gonbad Social Insurance Organization Khatam Hospital Golestan Iran Iranian Blood Transfusion Research Center Tehran 14117 Iran

AIM: To determine the prevalence and causes of persistently elevated alanine aminotransferase (ALT) levels among the general population in northern Iran. METHODS: A total of 2292 (1376 female, aged 18-75 year), were selected by systematic clustered random sampling from the cities and villages of Gonbad and Kalaleh in Golestan Province and invited to participate in the study. A comprehensive history regarding alcohol drinking and medication was taken. Body mass index (BMI), viral markers and ALT levels were measured. If ALT level was ≥ 40 U/L, it was rechecked twice within 6 mo. Those with ≥ 2 times elevation of ALT were considered as having persistently elevated ALT level. Non-alcoholic fatty liver disease (NAFLD) was diagnosed based on evidence of fatty liver upon sonography and excluding other etiology. RESULTS: A total of 2049 (1351 female) patients participated in the study, 162 (7.9%) had elevated ALT level at the first measurement. Persistently elevated ALT level was detected in 64 (3.1%) participants, with51 (79.6%) with no obvious etiology, six (9.3%) with Hepatitis B, four (6.2%) with Hepatitis C virus (HCV) infection and three (4.6%) with alcoholic hepatitis. The prevalence of NAFLD and alcoholic hepatitis was 2.04% (42 patients) and 0.1% (three), respectively. There was correlation between NAFLD and male gender, overweight, diabetes and living in an urban area [odds ratio = 3.03 (95% CI: 1.6-5.72), 4.21 (95% CI: 1.83-9.68), 2.86 (95% CI: 1.05-7.79) and 2.04 (95% CI: 1.00-4.16) respectively]. CONCLUSION: NAFLD is the most common cause of persistently elevated serum ALT level among the general population of Iran.

关键词： Alanine aminotransferase Iran Non-alcoholic fatty liver disease Viral hepatitis

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Evaluation of rutting performance of stone matrix asphalt mixtures containing warm mix additives

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Journal of Central South University 2017年第2期24卷 360-373页

作者： rezvan Babagoli Hassan Ziari Department of Civil Engineering Faculty of Engineering Pardis Branch Islamic Azad University School of Civil Engineering Iran University of Science and Technology

Permanent deformation or rutting, one of the most important distresses in flexible pavements, has long been a problem in asphalt mixtures and thus a great deal of research has been focused on the development of a rheological parameter that would address the rutting susceptibility of both unmodified and modified bituminous binders. In this research, three warm mix additives(Sasobit, Rheofalt and Zycotherm) were used to modify 60-70 penetration grade base binder. The rutting potential of both modified and unmodified binders were evaluated through the multiple stress creep recovery(MSCR)-based parameter, nonrecoverable compliance(Jnr) and recovery parameter(R). Several performance tests carried on stone matrix asphalt(SMA) mixtures comprising different nominal maximum aggregate sizes(NMASs, 9.5, 12.5 and 19 mm), like Marshall stability, dynamic and static creep and Hamburg wheel tracking tests to evaluate their rutting performance. The objective of this work is to correlate MSCR test results to performance. Results indicate that for the range of the gradations investigated in this work, increasing the nominal maximum aggregate size of the gradation would increase the permanent deformation resistance of the SMA mixture. Addition of 3% sasobit to base binder leads an increase in Jnr100 about 82%. Addition of 2% rheofalt to base binder leads an recovery increase of about 9.76 % and 27.44% in stress levels of 100 and 3200 Pa, respectively. The results reveal that rutting resistance of mixtures improves as Jnr decreases. The use of the MSCR test in the rutting characterization of bituminous binders is highly recommended based on the results of this work.

关键词： warm additives multiple stress creep recovery rutting flow number flow time wheel track test

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Influence of N^+implantation on structure,morphology,and corrosion behavior of Al in NaCl solution

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Chinese Physics B 2020年第5期29卷 516-524页

作者： Hadi Savaloni rezvan Karami Helma Sadat Bahari Fateme Abdi School of Physics College of ScienceUniversity of TehranTehranIran

Structural and morphological changes as well as corrosion behavior of N+implanted Al in 0.6 M NaCl solution as function of N+fluence are *** x-ray diffraction results confirmed AlN *** atomic force microscope(AFM)images showed larger grains on the surface of Al with increasing N+*** can be due to the increased number of impacts of N+with Al atoms and energy conversion to heat,which increases the diffusion rate of the incident ions in the ***,the number of the grain boundaries is reduced,resulting in corrosion resistance *** impedance spectroscopy(EIS)and polarization results showed the increase of corrosion resistance of Al with increasing N+*** data was used to simulate equivalent electric circuits(EC)for the *** dependence of the surface morphology on the EC elements was *** scanning electron microscope(SEM)analysis of the samples after corrosion test also showed that the surfaces of the implanted Al samples remain more intact relative to the untreated Al sample,consistent with the EIS and polarization results.

关键词： aluminium ion implantation surface morphology corrosion electrochemical impedance spectroscopy polarization

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Distinct element modelling of fracture plan control in continuum and jointed rock mass in presplitting method of surface mining

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International Journal of Mining Science and Technology 2014年第6期24卷 871-881页

作者： Sharafisafa Mansour Aliabadian Zeinab Alizadeh rezvan Mortazavi Ali Department of Mining Metallurgy and Petroleum Engineering Amirkabir University of Technology Department of Mining Engineering Sahand University of Technology

Controlled blasting techniques are used to control overbreak and to aid in the stability of the remaining rock formation. Presplitting is one of the most common methods which is used in many open pit mining and surface blast design. The purpose of presplitting is to form a fracture plane across which the radial cracks from the production blast cannot travel. The purpose of this study is to investigate of effect of presplitting on the generation of a smooth wall in continuum and jointed rock mass. The 2D distinct element code was used to simulate the presplitting in a rock slope. The blast load history as a function of time was applied to the inner wall of each blasthole. Important parameters that were considered in the analysis were stress tensor and fracturing pattern. The blast loading magnitude and blasthole spacing and jointing pattern were found to be very significant in the final results.

关键词： Controlled blasting Presplitting method Continuum and jointed rock mass Distinct element modelling

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Kinetics of gadolinium extraction with D2EHPA and Cyanex301 using single drop column

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Rare Metals 2016年第6期35卷 487-494页

作者： rezvan Torkaman Meisam Torab-Mostaedi Jaber Safdari Mohammad Ali Moosavian School of Chemical Engineering College of EngineeringUniversity of Tehran Nuclear Fuel Cycle Research School Nuclear Science and Technology Research Institute

The extraction kinetics of Gd（III） from the nitric acid medium using bis（2,4,4-trimethylpentyl） dithio- phosphinic acid （Cyanex301） and 2-ethylhexyl phosphoric acid （D2EHPA） in kerosene solution were measured by the single drop technique. The influences of hydrogen ion concentration, gadolinium ion concentration, extractant concentration, column height, and nozzle diameter on the extraction rate were investigated. The forward rate equations for the gadolinium extraction with D2EHPA and Cyanex301 were obtained. Based on the experimental results, the forward extraction rate constant was calculated. With the increase of D2EHPA or Cyanex301 concentration, the drop rising diameter and the value of interfacial tension decrease in the studied system, which shows that D2EHPA or Cyanex301 has interfacial activity as a kind of surfactant. Also, the droplet diameter and interfacial tension decrease with the increase of aqueous solution acidity. The experimental results show that the D2EHPA extractant provides faster extraction rate in comparison with Cyanex301 extractant, and it would be useful in industrial continuous extraction process.

关键词： Reaction kinetics Solvent extraction Single drop column Gadolinium Rare earths

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Numerical simulation of fatigue crack propagation in heterogeneous geomaterials under varied loads using displacement discontinuity method

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第3期15卷 702-716页

作者： rezvan Alizadeh Mohammad Fatehi Marji Abolfazl Abdollahipour Mehdi Pourghasemi Sagand Department of Mining and Metallurgical Engineering Faculty of EngineeringYazd UniversityYazdIran School of Mining Engineering College of EngineeringUniversity of TehranTehranIran

Heterogeneous brittle geomaterials are highly susceptible to cyclic *** contain inherent flaws and cracks that grow under fatigue loads and lead to *** study presents a numerical model for analyzing fatigue in these materials based on the two-dimensional(2D)boundary element method and linear elastic fracture *** process is formulated by coupling the displacement discontinuity method with the incorporation technique of dissimilar regions and the governing equations of *** heterogeneous media are assumed to consist of materials with different properties,and the interfaces are assumed to be completely *** addition,the domains include multiple cracks exposed to constant and variable amplitude cyclic *** stress intensity factor is a crucial parameter in fatigue analysis,which is determined using the displacement field around crack *** incremental crack growth scheme is applied to calculating the fatigue *** growth rate values are employed to estimate the length of crack extension when there are multiple *** interaction between cracks is considered,which also includes the coalescence ***,various structures under different cyclic loads are examined to evaluate the accuracy of this *** results demonstrate the efficiency of the proposed approach in modeling fatigue crack growth and life *** behavior of life curves for the heterogeneous domain was as *** curves illustrate the breakpoints caused by utilizing discrete incremental life *** these points,the trend of the curves changed with the material properties and fatigue characteristics of the new material around the crack tips.

关键词： Fatigue life Crack coalescence Interface Incorporation technique Variable amplitude loading

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Integration of buildings with third-generation photovoltaic solar cells: a review

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Clean Energy 2021年第3期5卷 505-526页

作者： Elahe Mirabi Fatemeh Akrami Abarghuie rezvan Arazi Department of Architecture Faculty of technical and engineeringIlam UniversityIlamI.R.Iran Department of Architecture Faculty of Art and ArchitectureYazd UniversityYazdI.R.Iran Department of Chemistry Faculty of scienceYazd UniversityYazdI.R.Iran

Clean-energy technologies have been welcomed due to environmental concerns and high fossil-fuel ***,photovoltaic(PV)cells are among the most well-known technologies that are used today to integrate with ***,these cells have attracted the attention of researchers and designers,combined with the windows and facades of buildings,as solar cells that are in a typical window or facade of a building can reduce the demand for urban electricity by generating clean *** the four generations that have been industrialized in the development of solar cells,the third generation,including dye-sensitized solar cells(DSSCs)and perovskite,is used more in combination with the facades and windows of *** to the characteristics of these cells,the study of transparency,colour effect and their impact on energy consumption is *** to now,case studies have highlighted the features mentioned in the building ***,this paper aims to provide constructive information about the practical and functional features as well as the limitations of this technology,which can be used as a reference for researchers and designers.

关键词： renewable energies building-integrated photovoltaics nano-crystalline dye-sensitized solar cell semi-transparent-based perovskite solar cells energy-saving

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Engineering Nano/Microscale Chiral Self‑Assembly in 3D Printed Constructs

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Nano-Micro Letters 2024年第3期16卷 313-332页

作者： Mohsen Esmaeili Ehsan Akbari Kyle George Gelareh rezvan Nader Taheri‑Qazvini Monirosadat Sadati Department of Chemical Engineering University of South CarolinaColumbiaSC 29208USA TA Instruments Waters LLCNew CastleDE 19720USA Biomedical Engineering Program University of South CarolinaColumbiaSC 29208USA

Helical hierarchy found in biomolecules like cellulose,chitin,and collagen underpins the remarkable mechanical strength and vibrant colors observed in living *** study advances the integration of helical/chiral assembly and 3D printing technology,providing precise spatial control over chiral nano/microstructures of rod-shaped colloidal nanoparticles in intricate *** designed reactive chiral inks based on cellulose nanocrystal(CNC)suspensions and acrylamide monomers,enabling the chiral assembly at nano/microscale,beyond the resolution seen in printed *** employed a range of complementary techniques including Orthogonal Superposition rheometry and in situ rheo-optic measurements under steady shear rate *** techniques help us to understand the nature of the nonlinear flow behavior of the chiral inks,and directly probe the flow-induced microstructural dynamics and phase transitions at constant shear rates,as well as their post-flow ***,we analyzed the photo-curing process to identify key parameters affecting gelation kinetics and structural integrity of the printed object within the supporting *** insights into the interplay between the chiral inks self-assembly dynamics,3D printing flow kinematics and photopolymerization kinetics provide a roadmap to direct the out-of-equilibrium arrangement of CNC particles in the 3D printed filaments,ranging from uniform nematic to 3D concentric chiral structures with controlled pitch length,as well as random orientation of chiral *** biomimetic approach can pave the way for the creation of materials with superior mechanical properties or programable photonic responses that arise from 3D nano/microstructure and can be translated into larger scale 3D printed designs.

关键词： Directed chiral self-assembly Cellulose nanocrystals Bioinspired nanocomposite 3D printing Rheology

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自复位学校建筑抗震韧性区域评估用数字孪生模型

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同济大学学报（自然科学版） 2023年第12期51卷 1879-1899页

作者： rezvan Pooya 张云峰马里兰大学土木与环境工程系公园市20742

在区域层面上对具有自复位模块结构的学校建筑进行抗震损伤和恢复力评估研究,建立了一个基于Python语言的从结构非线性分析到损伤程度可视化演示用的数字孪生模型。Python语言也是目前通用于机器学习模型训练的编程语言,方便在该数字孪... 详细信息

在区域层面上对具有自复位模块结构的学校建筑进行抗震损伤和恢复力评估研究,建立了一个基于Python语言的从结构非线性分析到损伤程度可视化演示用的数字孪生模型。Python语言也是目前通用于机器学习模型训练的编程语言,方便在该数字孪生模型中引入人工智能模型来代替结构仿真计算,通过使用实时监测地震动和结构响应数据结合人工智能模型进行区域灾害响应和功能恢复快速评估。结构损伤和恢复力分析结果(如不同地震下修复成本、修复时间、不可修复的概率等指标)通过生成shapefile在地理信息系统(GIS)软件中进行三维可视化,从而对采用自复位模块结构的学校建筑结构群在区域范围上进行抗震韧性定量评估。该模型的计算模块包括区域建筑结构清单生成、简化数值模型建立、地震响应非线性分析、结构响应参数生成、建筑结构易损部件定义、地震损失概率模型评估以及区域灾害损失的结果输出。这里的基于概率模型的学校建筑结构地震损失评估采用了FEMA P-58方法,并使用了Pelicun软件包进行计算。以旧金山湾区近2000栋学校建筑作为案例,对假定使用偏心支撑框架自复位结构作为抗震结构体系的学校建筑群进行了抗震韧性评估,研究了通过采用数字孪生模型对新型结构模块系统在学校建筑群区域灾害响应和功能恢复的影响。研究中使用了简化结构模型来缩短震后损伤和功能恢复仿真运算时间,同时提出了通过采用人工智能模型来实现强震后实时预测建筑群震后损失,并通过研究偏心支撑框架自复位结构体系的能量耗散比这一参数变化对学校建筑结构恢复力指标的影响,演示了采用不同的结构设计对建筑结构群在区域层面上的抗震损伤和恢复力的影响。

关键词：自复位结构区域地震灾害评估概率损伤评定数字孪生模型防灾减灾

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Comparison of sedative effectiveness of thiopental versus midazolam in reduction of shoulder dislocation

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World Journal of Emergency Medicine 2018年第2期9卷 125-129页

作者： Elnaz Vahidi rezvan Hemati Mehdi Momeni Amirhossein Jahanshir Morteza Saeedi Emergency Medicine Research Center Shariati Hospital Emergency Medicine Department Tehran University of Medical Sciences

BACKGROUND: Various sedative drugs have been proposed to control anxiety and agitation in shoulder dislocation, but none of them has been diagnosed as the best sedative and relaxant agent. The study aimed to compare the sedative effectiveness of thiopental versus midazolam in reduction of shoulder ***: A randomized double-blind controlled trail was performed in 80 patients with shoulder dislocation recruited from the emergency department. Ten patients were excluded and 70 patients were enrolled in the study. Case group received intravenous thiopental 2 mg/kg+2 μg/kg fentanyl while control group received intravenous midazolam 0.1 mg/kg+2 μg/kg fentanyl. Number of times, patients and physician's satisfaction, difficulty of procedure, degree of muscle relaxation, time of sedation and complete recovery, number of patients with apnea episode, O2 saturation, patient's pain score and adverse events were all ***: Muscular tone had significant difference between the two groups(P-value=0.014) and thiopental was more muscle relaxant than midazolam. Replacement of shoulder dislocation in thiopental group was easier than midazolam group(P-value=0.043). There was no need to use multiple methods of reduction in either group. Before drug infusion the mean±SD VAS scores were 8.37±2.21 in the midazolam group(A) and 8.94±1.78 in the thiopental group(B); mean difference 0.57, 95% CI= –0.38 to 1.52. After completion of the procedure, the mean±SD VAS scores in group(A) and(B) were 3.20±1.30 vs. 3.65±1.30; mean difference –0.45, 95% CI= –1.07 to ***: Thiopental might be more effective and relaxant than midazolam for reduction of shoulder dislocation.

关键词： Thiopental Shoulder dislocation Midazolam Emergency medicine

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