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Artificial Intelligence in Agriculture 2021年第1期5卷 185-195页

作者： Morteza Taki rouhollah farhadi Department of Agricultural Machinery and Mechanization Engineering Agricultural Sciences and Natural Resources University of KhuzestanP.O.Box:***MollasaniIran

Energy lost due to shadow in the absorber plate of solar collectors can decrease the solar energy *** some studies,mathematical modeling was applied for calculating the energy gain reduction due to shadow in flatplate solar *** this study,ANN method was developed for modeling the energy gain *** Perceptron(MLP)with one hidden layer and a range of neurons(5–30)by two training algorithms(LM and BR)and tangent sigmoid activation function(TanSig)were used by help of K-fold cross validation *** the first section,six set of solar collector dimensions were used(1×1;1×1.5;1×2;1.5×1.5;1.5×2 and 2×2).In the second section all the range of dimensions were used as the *** results of the first section showed thatMLPwith BR training algorithm can predict the energy gain reductionwith minimumMAPE and RMSE in all the *** best results related to(1.5×1.5)dimension that achieved a MAPE of 0.15±0.09%and RMASE of 4.42±2.43 KJm−2 year−1,*** results of the second section indicated that BR is a better training algorithm than *** MAPE and R2 factors for the best topology(5-27-1)were 0.0610±0.0051%and 0.9999±0.0001,*** results of the sensitivity analysis showed that height has the biggest impact on total energy gain reduction due to shadow in flat-plate solar ***,the results of this study indicated that by using ANN and decrease the energy lost,the efficiency of solar collectors can be increased in all applications such as industry and agriculture.

关键词： Multilayer perceptron Optimization Energy Sensitivity analysis

First Light Curve Analysis of NSVS 8294044,V1023 Her,and V1397 Her Contact Binary Systems

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Research in Astronomy and Astrophysics 2024年第5期24卷 1-12页

作者： Atila Poro Sabrina Baudart Mahshid Nourmohammad Zahra Sabaghpour Arani Fatemeh farhadi Selda Ranjbar Salehian Ahmad Sarostad Saeideh Ranjbaryan Iri Olya Maryam Hadizadeh AmirHossein Khodaei Astronomy Department of the Raderon AI Lab. BurnabyBCCanada Double Stars Committee SociétéAstronomique de FranceParisFrance Independent Astrophysics Researcher IsfahanIran Akhtaran Astronomical Society Isfahan ProvinceAran and BidgolIran Department of Physics Faculty of ScienceZanjan UniversityZanjanIran Astronomy Students'Scientific Association University of TabrizEast Azerbaijan ProvinceTabrizIran Yazd Desert Night Sky Astronomy Institute Yazd ProvinceYazdIran Ayaz Astronomical Association East Azerbaijan ProvinceTabrizIran Khayyam Astronomy Association FarsFasaIran

The first photometric light curve investigation of the NSVS 8294044,V1023 Her,and V1397 Her binary systems is *** used ground-based observations for the NSVS 8294044 system and Transiting Exoplanet Survey Satellite data for V1023 Her and V1397 *** primary and secondary times of minima were extracted from al the data,and,by collecting the literature,a new ephemeris was computed for each *** fits for the O-C diagrams were conducted using the Markov Chain Monte Carlo (MCMC) *** curve solutions were performed using the PHysics Of Eclipsing BinariEs Python code and the MCMC *** systems were found to be contact binary stars based on the fillout factor and mass ratio.V1023 Her showed the O’Connell effect and a cold starspot on the secondary component was required for the light curve *** absolute parameters of the system were estimated based on an empirical relationship between orbital period and *** presented a new T–M equation based on a sample of 428 contact binary systems and found that our three target systems were in good agreement with the *** positions of the systems were also depicted on the M–L,M–R,q–L_(ratio),and M_(tot)–J_(0)diagrams in the logarithmic scales.

关键词： (stars:)binaries eclipsing-techniques photometric-stars individual(NSVS 8294044)

Computational investigation of powder coating of nanoparticles in supersonic and hypersonic impactors

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Particuology 2013年第3期11卷 273-281页

作者： Nima Niksefat Mousa farhadi Kurosh Sedighi Salman Nourouzi Faculty of Mechanical Engineering Babol University of Technology

In this study, numerical simulation of flow field in a supersonic/hypersonic impactor with one or two nozzles was carried out using a commercial computational fluid dynamics （CFD） software FLUENT. The objective was to investigate the effects of working parameters such as pressure ratio （50 〈 Po]Pb 〈 800）, nozzle diameters （D=0.23, 0.27, 0.45 mm）, nozzle to plate distance （0.5 〈L/D〈 50）, particle diameter （1 nm〈 dp 〈 100 nm ） and angle between two nozzles. A single-phase 3D unsteady-state model was implemented by the software. For this purpose, a user-defined function （UDF） was employed to implement nanoparticles for different assumptions of Cunningham correction factor. An axisymmetric form of the compressible Navier-Stokes and energy equations was used for both fluid flow and temperature; Lagrangian particle trajectory analysis was used for particle motion. Using the variable Cunningham cor- rection factor showed suitable agreement with experimental data in comparison with other methods. Results show that increase of the distance between nozzle and impaction plate causes increase of Mach number, the distance between bow shock and impaction plate, and the collection efficiency. Maximum jet velocity, distance between bow shock and impaction plate and collection efficiency increase by using two nozzles in supersonic and hypersonic imoactors.

关键词： Impactor Supersonic and hypersonic flow Nanoparticles Aerosol Aerodynamics

A selective, sensitive and label-free visual assay of fructose using anti-aggregation of gold nanoparticles as a colorimetric probe

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Chinese Chemical Letters 2016年第6期27卷 847-851页

作者： Foroogh Keshvari Morteza Bahram Khalil farhadi Department of analytical Chemistry Faculty of chemistry Urmia University

A new convenient colorimetric sensor for fructose based on anti-aggregation of citrate-capped gold nanoparticles（Au NPs） is presented. 4-Mercaptophenylboronic acid（MPBA） induces the aggregation of Au NPs, leading to a color change from red to blue. Fructose as a potent competitor has strong affinity for MPBA and a borate ester is formed between MPBA and fructose. There is an obvious color change from blue to red with increasing the concentration of fructose. The anti-aggregation effect of fructose on Au NPs was seen by the naked eye and monitored by UV–vis spectra. Our results showed that the absorbance ratio（A（519）/A（640）） was linear with fructose concentration in the range of 0.032–0.96 μmol/L（R^2= 0.996）, with a low detection limit of 0.01 μmol/L（S/N = 3）. Notably, a highly selective recognition of fructose was shown against other monosaccharide and disaccharide（glucose, mannose, galactose,lactose and saccharose）. With anti-aggregation assays higher selectivity is achievable. The results of this work provide a rapid method for evaluating the quantitative analysis of fructose in human plasma at physiologically meaningful concentrations and at neutral pH. The proposed procedure can be used as an efficient method for the precise and accurate determination of fructose.

关键词： Colorimetric sensor Gold nanoparticles Anti-aggregation Fructose

Non-isolated Step-up DC-DC Converter Based on Switched Capacitor Cells

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CSEE Journal of Power and Energy Systems 2023年第3期9卷 1161-1172页

作者： Farid Mohammadi Gevork B.Gharehpetian Hasan Rastegar Mohammad farhadi-Kangarlu Amirkabir university of technology TehranIran Faculty of Electrical and Computer Engineering Urmia UniversityUrmiaIran

A non-isolated high gain step-up DC-DC converter for low power applications is suggested in this *** the designed transformerless converter,the main switch current and voltage stress is reduced while maintaining high voltage *** instance,with a duty cycle of 0.5 a voltage gain equal to 5 is achieved while the normalized switch voltage stress is ***,it decreases power losses of active and passive *** the proposed converter design,the switched-capacitor(SC)technique is used to obtain maximum voltage transfer gain using only one *** three modes of operation,i.e.,continuous conduction mode(CCM),boundary conduction mode(BCM),and discontinuous conduction mode(DCM),are studied in *** small signal analysis(SSA)of the designed converter is investigated,and its steady-state model is examined under *** of the proposed converter proposed in this study is assessed and tested using a *** of the converter is recorded above 94%in a wide range of output ***,compared to the other converters,the results suggest satisfactory performance of the designed *** issue of the proposed converter is that its input current is not smooth due to using the switched-capacitor cell in its *** issue is alleviated by using input filters.

关键词： DC-DC converter high voltage gain nonisolated switched capacitor cell voltage stress

Production of autotetraploid plants by in vitro chromosome engineering in Allium hirtifolium

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Horticultural Plant Journal(园艺学报:英文版) 2023年第5期9卷 986-998页

作者： Nasrin farhadi Jaber Panahandeh Alireza Motallebi-Azar Sam Mokhtarzadeh Department of Horticultural Science Faculty of AgricultureUniversity of TabrizTabriz 51666-14766Iran Field Crops Department Faculty of AgricultureUniversity of DuzceDuzce 81620Turkey

Persian shallot has been propagated vegetatively through daughter bulbs and has a narrow genetic *** the present study,to create genetic diversity in terms of ploidy level,the effects of in vitro polyploidization were investigated on morphological,physiological and phytochemical *** colchicine treatments(0,0.3%,0.5% and 0.7% concentrations)for 24,36 and 48 h and oryzalin treatments(0,0.001%,0.002% and 0.004% concentrations)for 4,6 and 8 h were used.A sterile basal plate of bulbs was used for the induction of polyploidy in liquid and solid *** obtaining plantlets,root tip chromosomes were counted for the determination of ploidy *** cytometry was performed to confirm the chromosome counting *** regenerated diploid and tetraploid plantlets were transferred to ex vitro *** and oryzalin were both successful in inducing polyploids and the polyploids induced were tetraploids and *** highest induction of polyploidy was obtained in solid media using 0.5%(w/v)colchicine for 36 h(35.0% polyploidy induction)and in 0.001%(w/v)Oryzalin for 8 h(45.5% polyploidy induction).Differences in plantlet height and weight,bulblet weight,density,stomatal width and length,and chlorophyll content were observed between tetraploid and diploid *** duplication,as a result of tetraploid induction,significantly influenced the antioxidant content and enzyme *** results showed that total phenolic content,allicin,and antioxidant capacity were significantly higher in the tetraploid plantlets than that in the diploid *** loci polymorphisms indicated that the 12 autotetraploid plants(with high allicin content)had different genotypes from the parental diploid ***,in vitro polyploidy induction not only duplicated chromosomes but also altered the DNA sequence in Allium *** vitro induction of tetraploids in *** can be a reliable way to obtain suitable plant material for bre

关键词： Persian shallot Allium hirtifolium Polyploidy Colchicine Oryzalin Molecular marker

Mucosal mast cells are pivotal elements in inflammatory bowel disease that connect the dots:Stress,intestinal hyperpermeability and inflammation

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World Journal of Gastroenterology 2007年第22期13卷 3027-3030页

作者： Ashkan farhadi Jeremy Z Fields Ali Keshavarzian Division of Digestive disease and Nutrition Rush University Medical Center Chicago IL United States

Mast cells (MC) are pivotal elements in several physiological and immunological functions of the gastro- intestinal (GI) tract. MC translate the stress signals that has been transmitted through brain gut axis into release of proinflammatory mediators that can cause stimulation of nerve endings that could affect afferent nerve terminals and change their perception, affect intestinal motility, increase intestinal hyperpermeability and, in susceptible individuals, modulate the inflammation. Thus, it is not surprising that MC are an important element in the pathogenesis of inflammatory bowel disease and non inflammatory GI disorders such as IBS and mast cell enterocolitis.

关键词： Mast cells Intestinal permeability Stress,Inflammatory bowel disease Irritable bowel syndrome Intestinal barrier

An Effective Framework for Fast Expert Mining in Collaboration Networks:A Group-Oriented and Cost-Based Method

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Journal of Computer Science & Technology 2012年第3期27卷 577-590页

作者： Farnoush farhadi Maryam Sorkhi Sattar Hashemi Ali Hamzeh School of Electrical and Computer Engineering Shiraz UniversityShirazIran

The growth of social networks in modern information systems has enabled the collaboration of experts at a scale that was unseen before. Given a task and a graph of experts where each expert possesses some skills, we tend to find an effective team of experts who axe able to accomplish the task. This team should consider how team members collaborate in an effective manner to perform the task as well as how efficient the team assignment is, considering each expert has the minimum required level of skill. Here, we generalize the problem in multiple perspectives. First, a method is provided to determine the skill level of each expert based on his/her skill and collaboration among neighbors. Second, the graph is aggregated to the set of skilled expert groups that are strongly correlated based on their skills as well as the best connection among them. By considering the groups, search space is significantly reduced and moreover it causes to prevent from the growth of redundant communication costs and team cardinality while assigning the team members. Third, the existing RarestFirst algorithm is extended to more generalized version, and finally the cost definition is customized to improve the efficiency of selected team. Experiments on DBLP co-authorship graph show that in terms of efficiency and effectiveness, our proposed framework is achieved well in practice.

关键词： expert team social network team formation

Study on the Shifting and the Development of Afghan Media System in the Past-Taliban Era（2001-2019）

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Study on the Shifting and the Development of Afghan Media Sy...

作者： Enayatullah farhadi 上海外国语大学

学位级别：硕士

This thesis is a study about the development and growth of media in Afghanistan and its influence on Afghan society and the role of foreign and organizational assistance to emergence an independent media in Afghanistan over the past *** the fall of the Taliban regime,the establishment of the developed and free media is counted as a major achievement in Afghanistan reconstruction *** quantity of media outlets and media freedom in the country has had incredible growth and the Afghan media enjoyed more freedom in comparison with other countries in the region after *** freedoms did not exist in the time of the Taliban *** all of the media including television and internet were forbidden at the time of the Taliban *** one government radio station activated under the severe control of them in Kabul the capital of *** radio did not broadcast educational and informational programs but further serving as a station for airing the religious *** the past eighteen years,the media sector in Afghanistan has advanced at a complex *** has the lowest literacy rate in the world where the people access to information and news by radio and television otherwise the needed information reachable only in print ***,despite the state newspapers,radio,and television,tens of private and independent TV channels and radios stations and hundreds of private newspapers have their activities *** rise of media in such a large number is indicated the unprecedented growth of media after the Taliban era which has not been repeated in the history of *** donors and international institutions assisted millions dollars to the development of media in Afghanistan over the last two *** most private and independent media in Afghanistan has financed by the international *** U.S government,some international institutions and the number of European countries have played a remarkabl

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CoFe_2O_4/CdS nanocomposite:Preparation,characterisation,and application in sonocatalytic degradation of organic dye pollutants

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Chinese Journal of Catalysis 2016年第9期37卷 1487-1495页

作者： saeed farhadi firouzeh siadatnasab Department of Chemistry Lorestan University Khoramabad 68135-465 Iran

A magnetic CoFe2O4/Cd S nanocomposite was prepared via one-step hydrothermal decomposition of cadmium diethanoldithiocarbamate complex on the surface of CoFe2O4 nanoparticles at a low temperature of 200 ℃.The nanocomposite was characterised by X-ray diffraction（XRD）,Fourier transform infrared spectroscopy（FT-IR）,scanning electron microscopy,energy-dispersive X-ray spectroscopy（EDX）,UV-visible spectroscopy,transmission electron microscopy（TEM）,N2 gas sorption analysis,X-ray photoelectron spectroscopy（XPS）,and vibrating sample *** FT-IR,XRD,EDX and XPS results confirmed the formation of the CoFe2O4/Cd S *** on the TEM analysis,the CoFe2O4/Cd S nanocomposite constituted nearly uniform,sphere-like nanoparticles of ～20 nm in *** optical absorption spectrum of the CoFe2O4/Cd S nanocomposite displayed a band gap of 2.21 e V,which made it a suitable candidate for application in sono/photocatalytic degradation of organic ***,the sonocatalytic activity of the CoFe2O4/Cd S nanocomposite was evaluated towards the H2O2-assisted degradation of methylene blue,rhodamine B,and methyl orange under ultrasonic *** nanocomposite displayed excellent sonocatalytic activity towards the degradation of all dyes examined—the dyes were completely decomposed within 5–9 ***,a comparison study revealed that the CoFe2O4/Cd S nanocomposite is a more efficient sonocatalyst than pure Cd S;thus,adopting the nanocomposite approach is an excellent means to improve the sonoactivity of Cd ***,the magnetic properties displayed by the CoFe2O4/Cd S nanocomposite allow easy retrieval of the catalyst from the reaction mixture for subsequent uses.

关键词： CoFe2O4/CdS nanocomposite Cadmium dithiocarbamate Hydrothermal decomposition Sonocatalyst Dye degradation