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| 1 | 采用上限分析方法对悬臂式挡土墙进行伪静力分析(英文)显示文摘鉴于悬臂式挡土墙在建设和开发项目中的广泛应用,合理考虑地震荷载的优化设计和分析是一个典型的工程问题。本文提出了一种利用上限法进行挡土墙拟静力分析的新算法。该算法可用于基于该机理墙体内外稳定性设计和校核。该算法的主要特点之一是能够有效地利用多目标优化,同时确定失效楔块的临界条件、作用在墙体上的最小安全系数和最大受力,以及墙体的最小重量。由所提出的失效机制所得到的结果表明,在使用上限极限分析方法时,作用力的最大化应同时考虑通过墙根后部平面方向的优化。本文还应用该算法确定了地震加速度系数的临界方向。地震加速度系数的临界方向定义为作用在墙体上的最大力方向,以保证墙体稳定的安全系数最小。本研究结果与基于极限平衡法和有限元分析的类似研究结果一致,通过遗传算法优化确定了关键失效机制。 | Asadollah RANJBAR KARKANAKI Navid GANJIAN Farajollah ASKARI | 2019 | Journal of Central South University2019，26，1： | 7 |
| 2 | TiC-Maraging stainless steel composite:microstructure, mechanical and wear properties显示文摘Particulate TiC reinforced 17-4PH and 465 maraging stainless steel matrix composites were processed by con- ventional powder metallurgy (P/M). TiC-maraging stainless steel composites with theoretical density >97% were produced using conventional P/M. The microstructure, and mechanical and wear properties of the composites were evaluated. The microstructure of the composites consisted of (core-rim structure) spherical and semi-spherical TiC particles depending on the wettability of the matrix with TiC particles. In TiC-maraging stainless steel composites, 465 stainless steel binder phase showed good wettability with TiC particles. Some microcracks appeared in the composites, indicating the presence of ten- sile stresses in the composites produced during sintering. The typical properties, hardness, and bend strength were reported for the composites. After heat treatment and aging, an increase in hardness was observed. The increase in hardness was at- tributed to the aging reaction in maraging stainless steel. The specific wear behavior of the composites strongly depends on the content of TiC particles and their interparticle spacing, and on the heat treatment of the maraging stainless steel. | Akhtar Farid Khadijah Ali Shah Syed Javid Askari | 2006 | Rare Metals2006，25，6： | 6 |
| 3 | High-temperature synthesis of SAPO-34 molecular sieve using a dry gel method显示文摘 | Yazdan Rezaei Rouein Halladj Sima Askari Ali Tarjomannejad Tofan Rezaei | 2016 | Particuology2016，14，4： | 5 |
| 4 | COVID-19 infection and liver injury:Clinical features,biomarkers,potential mechanisms,treatment,and management challenges显示文摘It is hypothesized that liver impairment caused by coronavirus disease 2019(COVID-19)infection might play a central role in severe clinical presentations.Liver injury is closely associated with severe disease and,even with antiviral drugs,have a poor prognosis in COVID-19 patients.In addition to the common hepatobiliary disorders caused by COVID-19,patients with pre-existing liver diseases demand special considerations during the current pandemic.Thus,it is vital that upon clinical presentation,patients with concurrent pre-existing liver disease associated with metabolic dysfunction and COVID-19 be managed properly to prevent liver failure.Careful monitoring and early detection of liver damage through biomarkers after hospitalization for COVID-19 is underscored in all cases,particularly in those with pre-existing metabolic liver injury.The purpose of this study was to determine most recent evidence regarding causality,potential risk factors,and challenges,therapeutic options,and management of COVID-19 infection in vulnerable patients with pre-existing liver injury.This review aims to highlight the current frontier of COVID-19 infection and liver injury and the direction of liver injury in these patients. | Gholam Reza Sivandzadeh Hassan Askari Ali Reza Safarpour Fardad Ejtehadi Ehsan Raeis-Abdollahi Armaghan Vaez Lari Mohammad Foad Abazari Firoozeh Tarkesh Kamran Bagheri Lankarani | 2021 | World Journal of Clinical Cases2021，9，22： | 5 |
| 5 | Effects of the nitrification inhibitor nitrapyrin and tillage practices on yield-scaled nitrous oxide emission from a maize field in Iran显示文摘Nitrification inhibitors can effectively decrease nitrification rates and nitrous oxide(N_(2)O)emission while increasing crop yield under certain conditions.However,there is no information available on the effects of nitrification inhibitors and tillage practices on N_(2)O emissions from maize cropping in Iran.To study how tillage practices and nitrapyrin(a nitrification inhibitor)affect N_(2)O emission,a split factorial experiment using a completely randomized block design with three replications was carried out in Northeast Iran,which has a cold semiarid climate.Two main plots were created with conventional tillage and minimum tillage levels,and two nitrogen(N)fertilizer(urea)management systems(with and without nitrapyrin application)were created as subplots.Tillage level did not have any significant effect on soil ammonium(NH_(4)^(+))and nitrate(NO_(3)^(-))concentrations,cumulative amount and yield-scaled N_(2)O emission,and aboveground biomass of maize,whereas nitrapyrin application showed significant effect.Nitrapyrin application significantly reduced the cumulative amount of N_(2)O emission by 41%and 32%in conventional tillage and minimum tillage practices,respectively.A reduction in soil NO_(3)^(-)concentration by nitrapyrin was also observed.The average yield-scaled N_(2)O emission was 13.6 g N_(2)O-N kg^(-1)N uptake in both tillage systems without nitrapyrin application and was significantly reduced to 7.9 and 8.2 g N_(2)O-N kg^(-1)N uptake upon the application of nitrapyrin in minimum tillage and conventional tillage practices,respectively.Additionally,nitrapyrin application increased maize biomass yield by 4%and 13%in the minimum tillage and conventional tillage systems,respectively.Our results indicate that nitrapyrin has a potential role in reducing N_(2)O emission from agricultural systems where urea fertilizers are broadcasted,which is common in Iran due to the practice of traditional farming. | Azam BORZOUEI Ulo MANDER Alar TEEMUSK Alberto SANZ-COBENA Mohammad ZAMAN Dong-Gill KIM Christoph MÜLLER Ali Askary KELESTANIE Parvaneh SAYYAD AMIN Ebrahim MOGHISEH Khadim DAWAR Ana Gabriela PÉREZ-CASTILLO | 2021 | Pedosphere2021，31，2： | 4 |
| 6 | Sintering behavior, microstructure and properties of TiC-FeCr hard alloy显示文摘TiC based cermets were produced with FeCr, as a binder, by conventional P/M (powder metallurgy) to near >97% of the theoretical density. Sintering temperature significantly affects the mechanical properties of the composite. The sintering temperature of >1360°C caused severe chemical reaction between TiC particles and the binder phase. In the TiC-FeCr cermets, the mechanical prop- erties did not vary linearly with the carbide content. Optimum mechanical properties were found in the composite containing 57wt% TiC reinforcement, when sintered at 1360°C for 1 h. Use of carbon as an additive enhanced the mechanical properties of the composites. Cermets containing carbon as an additive with 49wt% TiC exhibited attractive mechanical properties. The microstructure of the developed composite contained less or no debonding, representing good wettability of the binder with TiC particles. Homogeneous distribution of the TiC particles ensured the presence of isotropic mechanical properties and homogeneous distribution of stresses in the composite. Preliminary experiments for evaluation of the oxidation resistance of FeCr bonded TiC cermets indicate that they are more resistant than WC-Co hardmetals. | Farid Akhtar Shiju Guo Jawid Askari Jianjun Tian | 2007 | Journal of University of Science and Technology Beijing2007，14，1： | 3 |
| 7 | Cu-Zn-Al2O3 nanocomposites: study of microstructure, corrosion, and wear properties显示文摘Alumina nanoparticles were added to a Cu-Zn alloy to investigate their effect on the microstructural,tribological,and corrosion properties of the prepared alloys. Alloying was performed using a mixture of copper and zinc powders with 0vol% and 5vol% of α-Al nanopowder in a satellite ball mill. The results showed that the Cu-Zn solid solution formed after 18 h of mechanical alloying. The mechanically alloyed powder was compacted followed by sintering of the obtained green compacts at 750°C for 30 min. Alumina nanoparticles were uniformly distributed in the matrix of the Cu-Zn alloy. The tribological properties were evaluated by pin-on-disk wear tests,which revealed that,upon the addition of alumina nanoparticles,the coefficient of friction and the wear rate were reduced to 20% and 40%,respectively. The corrosion properties of the samples exposed to a 3.5wt% Na Cl solution were studied using the immersion and potentiodynamic polarization methods,which revealed that the addition of alumina nanoparticles reduced the corrosion current of the nanocomposite by 90%. | Mohammad Baghani Mahmood Aliofkhazraei Mehdi Askari | 2017 | International Journal of Minerals,Metallurgy and Materials2017，24，4： | 3 |
| 8 | Recognition of filled walnuts and empty walnuts using acoustic signal processing显示文摘An intelligent walnut recognition system combining acoustic emissions analysis,decision tree and fuzzy inference system(FIS)was developed and tested.In data acquisition part,Fast Fourier Transform(FFT)of impact signals was measured.Feature was extracted in two ways:using time domain and FFT of impact signal.The 66%of samples were used for training and the remains were used for testing.In selection feature part,the most important feature selected was:average and the second frequency amplitude of FFT.The method is based on the feature generation by FFT and time domain,produce decision tree with J48 algorithm and classification by fuzzy rules.The output of J48 algorithm was employed to produce the crisp if-then rule and membership function(MF)sets.The structure of FIS classifier was then defined based on the crisp sets.The results showed that the total classification accuracy was 94.7%,and the proposed FFT-J48-FIS model can be used in separation of filled walnuts from empty walnuts. | Smail Khalifahamzehghasem Mohammad Hassan Komarizadeh Mohammad Askari | 2012 | International Journal of Agricultural and Biological Engineering2012，5，3： | 3 |
| 9 | Evaluation of renewable energies production potential in the Middle East:confronting the world’s energy crisis显示文摘Oil and fossil fuels,the main source of energy in the Middle East have obviously the most destructive effects on the environment and public health.The developed countries of the Middle East are faced with the crisis and energy security.This paper is about evaluating the energy demand/consumption in the Middle East.First,the position of energy consumption in the world and the Middle East is discussed.Next,the evaluation of the current potential of clean energy production from renewable energies is explained.Finally,according to related maps,charts and information presented for the condition of renewable energy which has been approved by the countries of the Middle East,the greatest places in some countries of this region are introduced and discussed. | Hamid BAHRAMPOUR Amir Khosro BEHESHTI MARNANI Mohammad Bagher ASKARI Mohammad Reza BAHRAMPOUR | 2020 | Frontiers in Energy2020，14，1： | 3 |
| 10 | Peripheral interventions and antiplatelet therapy: Role in current practice显示文摘Peripheral arterial disease(PAD) is a common disorder associated with a high risk of cardiovascular mortality and continues to be under-recognized. The major risk factors for PAD are similar to those for coronary and cerebrovascular disease. Management includes exercise program, pharmacologic therapy and revascularization including endovascular and surgical approach. The optimal revascularization strategy, endovascular or surgical intervention, is often debated due to the paucity of head to head randomized controlled studies. Despite significant advances in endovascular interventions resulting in increased utilization over surgical bypass, significant challenges still remain. Platelet activation and aggregation after percutaneous transluminal angioplasty of atherosclerotic arteries are important risk factors for re-occlusion/restenosis and life-threatening thrombosis following endovascular procedures. Antiplatelet agents are commonly prescribed to reduce the risk of myocardial infarction, stroke and death from cardiovascular causes in patients with PAD. Despite an abundance of data demonstrating efficacy of antiplatelet therapy in coronary artery disease and cerebrovascular disease, there is a paucity of clinical information, clinical guidelines and randomized controlled studies in the PAD population. Hence, data on antiplatelet therapy in coronary interventions is frequently extrapolated to peripheral interventions. The aim of this review article is to elucidate the current data on revascularization and the role and duration of antiplatelet and anticoagulant therapy in re-vascularized lower limb PAD patients. | Pahul Singh Yenal Harper Carrie S Oliphant Mohamed Morsy Michelle Skelton Raza Askari Rami N Khouzam | 2017 | World Journal of Cardiology2017，9，7： | 2 |
| 11 | Effect of microstructural parameters on the properties of W-Ni-Fe alloys显示文摘The aim of this research was to examine the effect of microstructural parameters on the tensile properties of dif- ferent compositions of tungsten heavy alloys. The microstructural parameters (grain size, connectivity, contiguity, and solid volume fraction) were measured and were found to have a significant effect on the tensile properties of tungsten-based heavy alloys. The microstructural parameters of W-Ni-Fe alloys are sufficiently different to present a range of me- chanical properties. It is concluded that the mechanical properties of tungsten heavy alloys largely depend on the micro- structural parameters and their ductility is particularly harmed when grains are contiguous. | S.H. Islam QU Xuanhui S.J. Askari M. Tufail and HE Xinbo | 2007 | Rare Metals2007，26，3： | 2 |
| 12 | 沉积参数对CVD金刚石晶粒尺寸的影响显示文摘采用DC Arc Plasma Jet CVD方法制备了金刚石自支撑膜体,考察了温度分布、沉积腔压和CH4/H2等沉积参数对所制备金刚石膜体中的晶粒尺寸的影响.实验发现沿温度降低的方向和增加腔压会使晶粒尺寸变大,当CH4/H2超过15%后,有带刻面的晶粒出现.本次实验最大的晶粒对角线长度超过1mm. | 陈广超 兰昊 李彬 戴风伟 Askari J 黑立富 宋建华 李成名 唐伟忠 佟玉梅 吕反修 | 2007 | Journal of Semiconductors2007，28，z1： | 2 |
| 13 | Robust Adaptive Actuator Failure Compensation for a Class of Uncertain Nonlinear Systems显示文摘This paper presents a robust adaptive state feedback control scheme for a class of parametric-strict-feedback nonlinear systems in the presence of time varying actuator failures. The designed adaptive controller compensates a general class of actuator failures without any need for explicit fault detection. The parameters, times, and patterns of the considered failures are completely unknown. The proposed controller is constructed based on a backstepping design method. The global boundedness of all the closed-loop signals is guaranteed and the tracking error is proved to converge to a small neighborhood of the origin. The proposed approach is employed for a two-axis positioning stage system as well as an aircraft wing system. The simulation results show the correctness and effectiveness of the proposed robust adaptive actuator failure compensation approach. | Mahnaz Hashemi Javad Askari Jafar Ghaisari Marzieh Kamali | 2017 | International Journal of Automation and computing2017，14，6： | 2 |
| 14 | Energy consumption of electrooxidation systems with boron-doped diamond electrodes in the pulse current mode显示文摘A pulse current technique was conducted in a boron-doped diamond (BDD) anode system for electrochemical wastewater treatment. Due to the strong generation and weak absorption of hydroxyl radicals on the diamond surface, the BDD electrode possesses a powerful capability of electrochemical oxidation of organic compounds, especially in the pulse current mode. The influences of pulse current parameters such as current density, pulse duty cycle, and frequency were investigated in terms of chemical oxygen demand (COD) removal, average current efficiency, and specific energy consumption. The results demonstrated that the relatively high COD removal and low specific energy consumption were obtained simultaneously only if the current density or pulse duty cycle was adjusted to a reasonable value. Increasing the frequency slightly enhanced the COD removal and average current efficiency. A pulse-BDD anode system showed a stronger energy saving ability than a constant-BDD anode system when the electrochemical oxidation of phenol of the two systems was compared. The results prove that the pulse current technique is more cost-effective and more suitable for a BDD anode system for real wastewater treatment. A kinetic analysis was presented to explain the above results. | Jun-jun Wei Xu-hui Gao Li-fu Hei Jawaid Askari Cheng-ming Li | 2013 | International Journal of Minerals,Metallurgy and Materials2013，20，1： | 2 |
| 15 | Synthesis and characterization of Nano-crystalline CVD diamond film on pure titanium using Ar/CH4/H2 gas mixture显示文摘 | Askari S J Akhtar F Chen G C | 2007 | Mater Lett2007，61，： | 1 |
| 16 | Synthesis and Characterization of Acrylic-Based Superabsorbents 显示文摘 | Askari F Nafisi S Omidian H | 1993 | J Appl Polym Sci1993，50，： | 1 |
| 17 | Effect of stwmal-cell-derived factor 1 on stem-cell homing and tissue regeneration in ischaemic cardiomyopathy显示文摘 | Askari AT Unzek S Popovic ZB | 2003 | Lancet2003，362，： | 1 |
| 18 | Effect of stromal-cell-derived factor 1 on stem-cell homing and tissue regeneration in ischaemic cardiomyopathy显示文摘 | Askari AT Unzek S Popovic ZB | 2003 | Lancet2003，362，9385： | 1 |
| 19 | Pancreatitis with arthropathy and subcutaneous fat necrosis: evidence for the pathogenicity of lipolytic enzymes显示文摘 | Wilson HA Askari AD Neiderhiser DH | 1983 | Arthritis Rheum1983，26，2： | 1 |
| 20 | Use of a titanium pspillary itsert for the construction of interimplant papillae显示文摘 | Abd El Salam El Askary | 2000 | Implant Dentinstry2000，9，： | 1 |
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