检索结果-南通市图书馆

A low-voltage and energy-efficient full adder cell based on carbon nanotube technology

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2010年第2期2卷 114-120页

作者： Keivan Navi Rabe'e Sharifi Rad Mohammad hossein Moaiyeri amir Momeni Faculty of Electrical and Computer Engineering Shahid Beheshti UniversityGC

Scaling problems and limitations of conventional silicon transistors have led the designers to exploit novel nano-technologies. One of the most promising and feasible nano-technologies is CNT(Carbon Nanotube) based transistors. In this paper, a high-speed and energy-efficient CNFET(Carbon Nanotube Field Effect Transistor) based Full Adder cell is proposed for nanotechnology. This design is simulated in various supply voltages, frequencies and load capacitors using HSPICE circuit simulator. Significant improvement is achieved in terms of speed and PDP(Power-Delay-Product) in comparison with other classical and state-of-the-art CMOS and CNFET-based designs, existing in the literature. The proposed Full Adder can also drive large load capacitance and works properly in low supply voltages.

关键词： CNFET Low-Voltage Full-Adder Minority-Function Nanotechnology

Investigation of production depletion rate effect on the ne ar-wellbore stresses in the two Iranian southwest oilfields|

在线全文

学校读者我要写书评

暂无评论

Petroleum Research 2020年第4期5卷 347-361页

作者： Khalil Shahbazi amir hossein Zarei Alireza Shahbazi Abbas Ayatizadeh Tanha Faculy Member of Petroleur University of Technologx Iran Ahwaz Faculy of Engineering Petroleurm University of Techunology Iran National lrunion Driling Compury Well Logging DepartmentAhwazlran

Effect of depletion rate on wellbore stability due to production of oil from hydrocarbon-bearing reser-voirs is important and can result in a reduction of the reservoir pore pressure.A reduction in the reservoir pressure,in tum,results in a change in the stresses acting within the *** these changes are not well analyzed and applied in future calculations,we may be unsuccessful in some cases such as drilling infill wells or extended wells,forecast of sand production and optimum flow rate,preventing of casing collapse,***,knowing the stresses around the well at every stage of production is fundamental to the next *** this paper,we recognized these changes in near-wellbore stresses using data from logging(image log,dipole sonic,full set log,mud log),production data,infor-mation from kick,blow out,loss *** determined it using Techlog software and theoretical *** wells of two huge oilfields of sw Iran were investigated after depletion or production for long *** each well,state of stresses were calculated in cases of safe drilling mud weight using log data and theoretical *** the end effect of depletion rate on wellbore stability was investigated in these three wells.

关键词： Depletion rate Wellbore stability Pore pressure Sand production Near-wellbore stress

Effects of hooked-collar on the local scour around a lenticular bridge pier

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2023年第1期38卷 1-11页

作者： Rashid Farooq amir hossein Azimi Muhammad Atiq Ur Rehman Tariq Afzal Ahmed Department of Civil Engineering International Islamic University Department of Civil Engineering Lakehead University College of Engineering and Science Victoria University Department of Civil Engineering University of Engineering and Technology James Watt School of Engineering University of Glasgow

This paper presents the results of comprehensive laboratory experiments to investigate the effects of hooked-collar on the scour development around a vertical pier with a lenticular cross section. The flow around the pier was uniform, steady, and under the clear-water condition. The axial scour profiles for cases without and with a lenticular hooked-collar were measured and the effects of hooked-collar dimensions and elevation from the bed were examined. To compute the efficiency of hooked-collar for scour prevention, the results of local scour for a bridge pier without a collar and a bridge pier with a plain collar, without a hooked wall, were used as benchmark data sets. A wide range of hooked-collar geometries such as the ratio of collar width to the pier width, Wc/Wp, ranging from 1.5 to 3.5, the ratio of hooked-collar wall height to the pier width, Hc/Wp, ranging from 0.15 to 0.6, and the ratio of collar elevation to the pier width, Ec/Wp, of-0.5, 0, and 0.5 were tested. The experimental results indicated that the equilibrium scour depth decreased with the ratio of hooked-collar to the pier width when Wcis twice the pier width, Wp. For Wc/Wp> 2, the scour depth was similar to the tests with an infinitely large pier width. In addition, the scour depth consistently reduced as the hooked-collar wall height, Hc, to the pier width, Wp, approached 0.3. The highest scour reduction efficiency was achieved when the hooked-collar being placed on the bed surface. Empirical models were developed for prediction of maximum scour depth near the lenticular bridge pier with a modified collar. The results showed that the volume of scour hole around a lenticular pier increased non-linearly with the maximum scour depth and it was independent of the hooked-collar geometry.

关键词： Local scour Erosion Collar Hooked-collar Lenticular pier Scour countermeasure Steady flow

Evaluation of some engineering properties of cucumber(Cucumis sativus L.)seeds and kernels based on image processing

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Information Processing in Agriculture 2017年第4期4卷 300-315页

作者： amir hossein Mirzabe Masoud Barati kakolaki Behnam Abouali Rasoul Sadin Department of Mechanical Engineering of Biosystems Aboureihan CollegeTehran UniversityTehranIran Department of Biosystems Bajgah CollegeShiraz UniversityShirazIran

In this study,a method based on digital image processing was employed to investigate effect of the moisture content on gravimetrical and frictional properties of the cucumber seeds and *** research indicated that the application of visual machines and the image processing could be a rapid method that enables accurate measurement of the dimensional parameters of two varieties of this product *** length,width,and thickness of the seeds of Rashid variety ranged from 6.40 to 9.07,2.91 to 4.21 and 0.65 to1.50 mm,respectively;the corresponding value of Negin variety ranged from 6.89 to 9.07,2.49 to 4.21,and 0.69 to 1.68 mm,*** and shell ratios of the Rashid variety were found to be 69.811 and 30.189%,respectively;the corresponding values of the Negin variety were found to be 72.727 and 27.273%,*** the bulk densities of the two varieties of cucumber seeds and kernels that decreased with the moisture content,true density and porosity of the two varieties of cucumber seeds and kernels *** the moisture content increased from 5.04 to 21.12%(d.b),the angle of the static friction of the seeds of Negin variety increased from 30.39°to 37.18°,28.83° to 34.991,24.37°to 30.04°,and 15.77°to 19.57°for wood,rubber,iron,and galvanized,respectively,the corresponding value of the Negin variety increased from 21.12to 27.16°,24.43°to 31.41°,19.90°to 25.59°and 14.09°to 18.12°as the moisture content increased from 5.02 to 21.02%(d.b).

关键词： Image processing Physical and mechanical properties Cucumber

Adaptive Fuzzy Sliding Mode Control of Under-actuated Nonlinear Systems

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2018年第3期15卷 364-376页

作者： amir hossein Davaie Markazi Mohammad Maadani Seyed Hassan Zabihifar Nafiseh Doost-Mohammadi School of Mechanical Engineering Iran University of Science and Technology

A new extension of the conventional adaptive fuzzy sliding mode control（AFSMC） scheme, for the case of under-actuated and uncertain affine multiple-input multiple-output（MIMO） systems, is presented. In particular, the assumption for non-zero diagonal entries of the input gain matrix of the plant is relaxed. In other words, the control effect of one actuator can propagate from a subgroup of canonical state equations to the rest of equations in an indirect sense. The asymptotic stability of the proposed AFSM control method is proved using a Lyapunov-based methodology. The effectiveness of the proposed method for the case of under-actuated systems is investigated in the presence of plant uncertainties and disturbances, through simulation studies.

关键词： Adaptive fuzzy sliding mode control (AFSMC) nonlinear systems uncertain systems under-actuated systems remoteenvironmental monitoring units (REMUS).

Using Pd-salen complex as an efficient catalyst for the copper-and solvent-free coupling of acyl chlorides with terminal alkynes under aerobic conditions

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2010年第6期21卷 656-660页

作者： Mohammad Bakherad amir hossein Amin Ali Keivanloo Bahram Bahramian Mersad Raessi School of Chemistry Shahrood University of TechnologyShahroodIran

The palladium-salen complex palladium(Ⅱ) N,N'-bis{[5-(triphenylphosphonium)-methyl]salicylidene}-1,2-ethanediamine chloride was found to be a highly active catalyst for the copper- and solvent-free coupling reaction of terminal alkynes with different acyl chlorides in the presence of triethylamine as base,giving excellent ynones under aerobic conditions.

关键词： Copper-free Ynones Pd-salen complex Neat

Developing a robust correlation for prediction of sweet and sour gas hydrate formation temperature

在线全文

学校读者我要写书评

暂无评论

Petroleum 2022年第2期8卷 204-209页

作者： Mohammad Mesbah Samaneh Habibnia Shahin Ahmadi amir hossein Saeedi Dehaghani Sareh Bayat Young Researchers and Elites Club Science and Research BranchIslamic Azad UniversityTehranIran Department of Chemical Engineering Sahand University of TechnologyTabrizIran Department of Environmental Health Engineering Faculty of Environment Health EngineeringZabol University of Medical SciencesZabolIran Department of Petroleum Engineering Faculty of Chemical EngineeringTarbiat Modares UniversityTehranIran Department of Environmental Health Engineering School of Public HealthHamedan University of Medical SciencesHamedanIran

There are numerous correlations and thermodynamic models for predicting the natural gas hydrate formation condition but still the lack of a simple and unifying general model that addresses a broad ranges of gas *** study was aimed to develop a user-friendly universal correlation based on hybrid group method of data handling(GMDH)for prediction of hydrate formation temperature of a wide range of natural gas mixtures including sweet and sour *** establish the hybrid GMDH,the total experimental data of 343 were obtained from open *** selection of input variables was based on the hydrate structure formed by each gas *** modeling resulted in a strong algorithm since the squared correlation coefficient(R2)and root mean square error(RMSE)were 0.9721 and 1.2152,*** comparison to some conventional correlation,this model represented not only the outstanding statistical parameters but also its absolute superiority over *** particular,the result was encouraging for sour gases concentrated at H2S to the extent that the model outstrips all available thermodynamic models and *** statistical approach was applied on datasets to the discovery of the defected and doubtful experimental data and suitability of the *** to this algorithm,approximately all the data points were in the proper range of the model and the proposed hybrid GMDH model was statistically reliable.

关键词： Hydrate formation temperature HFT Wide range of natural gas mixtures Unified correlation Group method of data handling GMDH Outlier detection

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Medicine 2023年第4期21卷 354-360页

作者： amir Mohammad Jaladat Mahdi Alizadeh Vaghasloo Fatemeh Atarzadeh Mohammad hossein Ayati amir Hooman Kazemi Emine Akin Mohammad Hashem Hashempur Department of Persian Medicine School of MedicineShiraz University of Medical SciencesShiraz ***Iran Department of Traditional Medicine School of Persian MedicineTehran University of Medical SciencesTehran ***Iran Department of History of Medicine School of Traditional MedicineTehran University of Medical SciencesTehran ***Iran International School Beijing University of Chinese MedicineBeijing 100029China Alkali Life Center Healthy Life&Consultancy and EducationAtas ehir-Istanbul 34750Turkey Research Center for Traditional Medicine and History of Medicine Department of Persian MedicineSchool of MedicineShiraz University of Medical SciencesShiraz ***Iran

Kaiy(medieval cautery)is an ancient method of heat therapy in traditional Persian medicine(TPM).Some of its important applications have been neglected during the medical ***,different treatment modalities that incorporate heat,including moxibustion,have progressed in traditional Chinese *** this study,we reviewed the main TPM textbooks that were written specifically in the field of *** considered the traditional teachings in the context of contemporary information,gathered from the scientific literature about moxibustion and modern *** surgical therapeutic indications of kaiy(e.g.,debridement and coagulative procedures)have been advanced by the innovation of ***,those therapeutic applications that were based on the TPM humoral theory for relieving body coldness or myofascial pains—which are similar to moxibustion usages—have not received the same *** from the broad similarities of kaiy and moxibustion as thermal therapies with similar indications,there is a striking correspondence between kaiy point mapping and ***,further research on different kaiy aspects is recommended.

关键词： Traditional Persian medicine Moxibustion Chinese medicine Kaiy Medieval cautery Fire acupuncture

Experimental study of Iranian heavy crude oil viscosity reduction by diluting with heptane, methanol, toluene, gas condensate and naphtha

在线全文

学校读者我要写书评

暂无评论

Petroleum 2016年第4期2卷 415-424页

作者： amir hossein Saeedi Dehaghani Mohammad Hasan Badizad Petroleum Engineering Group Faculty of Chemical EngineeringTarbiat Modares UniversityTehranIran

Due to the high viscosity of heavy crude oils,production from these reservoirs is a demanding *** tackle this problem,reducing oil viscosity is a promising *** are various methods to reduce viscosity of heavy oil:heating,diluting,emulsification,and core annular *** this study,dilution approach was employed,using industrial solvents and gas *** viscosity of two Iranian heavy crude oils was measured by mixing with solvents at different *** of both oil samples with toluene and heptane,resulted in viscosity ***,their effect became less significant at higher concentrations of *** of forming hydrogen bonds,adding methanol to heavy crude oil resulted in higher *** adding condensate,viscosity of each sample *** condensate had a greater impact on heavier oil;however,at higher temperatures its effect was *** with naphtha decreased heavy oil viscosity in the same way as n-heptane and *** experimental investigation,different viscosity models were evaluated for prediction of heavy oil/solvent *** was recognized that Lederer'model is the best one.

关键词： Heavy oil Viscosity reduction Dilution Toluene Methanol n-Heptane Naphtha Gas condensate