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Temperature effect on performance of nanoparticle/surfactant flooding in enhanced heavy oil recovery

Petroleum Science 2019年第6期16卷 1387-1402页

作者： Sajjad Mahmoudi Arezou jafari Soheila Javadian Department of Petroleum Engineering Faculty of Chemical EngineeringTarbiat Modares UniversityTehranIran Department of Physical Chemistry Faculty of Basic ScienceTarbiat Modares UniversityP.O.Box 14115-175TehranIran

Recently,nanoparticles have been used along with surfactants for enhancing oil *** the recent studies show that oil recovery is enhanced using nanoparticle/surfactant solutions,some effective parameters and mechanisms involved in the oil recovery have not yet been ***,the temperature effect on the stability of nanoparticle/surfactant solutions and ultimate oil recovery has been studied in this work,and the optimal concentrations of both SiO2 nanoparticle and surfactant(sodium dodecyl sulfate)have been determined by the Central Composite Design *** addition,the simultaneous effects of parameters and their interactions have been *** of the stability of the injected solutions indicates that the nanoparticle concentration is the most important factor affecting the solution *** surfactant makes the solution more stable if used in appropriate concentrations below the *** to the micromodel flooding results,the most effective factor for enhancing oil recovery is temperature compared to the nanoparticle and surfactant ***,in floodings with higher porous medium temperature,the oil viscosity reduction is considerable,and more oil is *** addition,the surfactant concentration plays a more effective role in reservoirs with higher *** other words,at a surfactant concentration of 250 ppm,the ultimate oil recovery is improved about 20%with a temperature increase of 20°***,when the surfactant concentration is equal to 750 ppm,the temperature increase enhances the ultimate oil recovery by only about 7%.Finally,the nanoparticle and surfactant optimum concentrations determined by Design-Expert software were equal to 46 and 159 ppm,*** is worthy to note that obtained results are validated by the confirmation test.

关键词： Enhanced heavy oil recovery Nanoparticle Surfactant Temperature High salinity brine Stability Micromodel Experimental design

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Determination of the oxidative stability of olive oil using an integrated system based on dielectric spectroscopy and computer vision

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Information Processing in Agriculture 2019年第1期6卷 20-25页

作者： alireza Sanaeifar Abdolabbas jafari Department of Biosystems Engineering Shiraz UniversityShirazIran Lincoln Agritech Ltd. Lincoln UniversityLincolnNew Zealand

During storage,olive oil may suffer degradation leading to an inferior quality level when purchased and *** stability is one of the most important parameters for maintaining the quality of olive oil,which affects its acceptability and market *** current methods of predicting the oxidative stability of edible oils are costly and *** aim of the present research is to demonstrate the use of dielectric spectroscopy integrated with computer vision for determining the oxidative stability index(OSI)of olive *** most effective features were selected from the extracted dielectric and visual features for each olive oil *** machine learning techniques were employed to process the raw data to develop an oxidative stability prediction algorithm,including artificial neural network(ANN),support vector machine(SVM)and multiple linear regression(MLR).The predictive models showed a great agreement with the results obtained by the Rancimat instrument that was used as a reference *** best result for modelling the oxidative stability of olive oil was obtained using SVM technique with the R-value of *** can be concluded that this new approach may be utilized as a perfect replacement for quicker and cheaper assessment of olive oil oxidation.

关键词： Computer vision Dielectric spectroscopy Olive oil Oxidative stability index

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Evaluation of the Relationship between Blocking Patterns and Duration of Spring Frost Waves:The Case of Iran

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Journal of Meteorological Research 2020年第3期34卷 586-600页

作者： Farzaneh jafari HOMBARI Gholamreaza BARATI Mohammad MORADI Department of Physical Geography Faculty of Earth SciencesUniversity of Shahid BeheshtiTehran ***Iran Iran Meteorological Organization Tehran ***Iran

In order to evaluate the effects of blocking patterns on the duration of frost waves across Iran,the minimum daily temperatures of 60 weather stations were collected from 20 March 1968 to 21 June *** findings,which were obtained based on the distribution tables of reported temperatures and their frequency variation graphs,resulted in identifying 114 frost *** obtained the daily weather maps at 500 hPa from NCEP/NCAR during the peak days of durable frosts,and it was revealed that the formation of low pressures over 20°-70°E and the dominant southwest-northeast troughs at 500 hPa facilitated the influx of cold air from both eastern Europe and central Siberia toward Iran,leading to the average frost duration of 12.4 ***,low-pressure centers appeared in a dipole pattern in northern Iran over Caspian Sea and created durable frosts with an average duration of 15.4 *** effect of omega shaped pattern of the geopotential height on durable frosts demonstrated a sharp difference with two recent patterns leading to the frost occurrence with a 13.3-day duration ***,the slow speed of cold western currents in the rex type of blocking from 30°to 50°N caused durable frosts of 14.3 ***,we found a specific reduction in the frequency of blocking patterns,which has occurred in the past four ***,the blocking and non-blocking patterns cause long-and short-duration frosts over Iran,respectively.

关键词： blocking patterns durable frosts spring season Iran

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Nanoparticles assisted microwave radiation:Fluid-rock interactions in oil reservoirs

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Petroleum Science 2021年第6期18卷 1797-1812页

作者： Hamzeh Shamsi Armandi Arezou jafari Reza Gharibshahi Faculty of Chemical Engineering Tarbiat Modares UniversityTehranIran

Recently,many researchers have focused on the usage of electromagnetic waves in oil production and well stimulation,but so far the effect of these waves on the fluid and rock interaction and its simultaneous effect with nanoparticles have not been ***-rock interaction is one of the most important factors affecting fluid distribution in the *** this study,the oil reservoir rock wettability alteration under electromagnetic heating and the presence of nanoparticles has been *** nanoparticles of TiO_2,Fe_(3)O_(4),and TiO_2/Fe_(3)O_(4)have been ***_2 nanoparticles are commercially available,and the other mentioned nanoparticles are synthesized via a co-precipitation *** acid has been used to modify surfaces of nanoparticles and stabilize them in water as the base ***,the adsorption of the nanoparticles on the rock surface has been *** the next step,the amount of oil outflow from the rock has been measured and reported as the external fluid *** this process,the nanoparticle performance in wettability alteration was investigated using pH and inductively coupled plasma(ICP)*** better understand the governing mechanisms,oil viscosity was measured by mixing the oil with nanoparticles and put under *** results reveal that the microwave has a great ability to reduce oil contact angle with carbonate *** the presence of0.2 wt%Fe_(3)O_(4)nanoparticles,the contact angle was reduced from 155°to 19°after 28 min of irradiation,indicating strong rock ***,microwave irradiation on Fe_(3)O_(4)nanofluid extracts75%of the oil from the *** microwave radiation,the pH of the nanofluid increases and hence,more nanoparticles are adsorbed on the rock which subsequently causes more rock *** viscosity change results prove that there is an optimal irradiation time of 5 min in which oil viscosity reduces from 481 cP to 410 cP and then increases to 827

关键词： Microwave radiation Wettability alteration Nanoparticle adsorption Rock-fluid interaction

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A drought resistance index to select drought resistant plant species based on leaf water potential measurements

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Journal of Arid Land 2019年第4期11卷 623-635页

作者： SayedJamaleddin KHAJEDDIN SayedHamid MATINKHAH Zahra jafari Department of Natural Resources Isfahan University of Technology

The water deficit in arid and semi-arid regions is the primary limiting factor for the development of urban greenery and forestation. In addition, planting the species that consume low levels of water is useful in arid and semi-arid regions that have poor water management measures. Leaf water potential(Ψ) is a physiological parameter that can be used to identify drought resistance in various species. Indeed, Ψ is one of the most important properties of a plant that can be measured using a pressure chamber. Drought avoiding or drought resistant species have a lower Ψ than plants that use normal or high levels of water. To determine drought resistance of species that are suitable for afforestation in arid urban regions, we evaluated twenty woody species in the Isfahan City, central Iran. The experimental design was random split-split plots with five replications. The species were planted outdoor in plastic pots and then subjected to treatments that consisted of two soil types and five drip irrigation regimes. To evaluate the resistance of each species to drought, we used the Ψ and the number of survived plants to obtain the drought resistance index(DRI). Then, cluster analysis, dendrogram, and similarity index were used to group the species using DRI. Result indicates that the evaluated species were classified into five groups:(1) high water consuming species(DRI>–60 MPa);(2) above normal water consuming species(–60 MPa≥DRI>–90 MPa);(3) normal water consuming species(–90 MPa≥DRI>–120 MPa);(4) semi-drought resistant species(–120 MPa≥DRI>–150 MPa);and(5) drought resistant species(DRI≤–150 MPa). According to the DRI, Salix babylonica L., Populus alba L., and P. nigra L. are high water consuming species, Platanus orientalis L. and Albizia julibrissin Benth are normal water consuming species, and Quercus infectoria Oliv. and Olea europaea L. can be considered as drought resistant species.

关键词： drought resistant species drought resistance index forestation leaf water potential water deficit

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Numerical analysis of rock fracturing by gas pressure using the extended finite element method

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Petroleum Science 2015年第2期12卷 304-315页

作者： Majid Goodarzi Soheil Mohammadi Ahmad jafari Department of Civil Engineering and Geoscience University of Newcastle School of Civil Engineering University of Tehran School of Mining Engineering University of Tehran

High energy gas fracturing is a simple approach of applying high pressure gas to stimulate wells by gen- erating several radial cracks without creating any other damages to the wells. In this paper, a numerical algorithm is proposed to quantitatively simulate propagation of these fractures around a pressurized hole as a quasi-static phenomenon. The gas flow through the cracks is assumed as a one-dimensional transient flow, governed by equations of conservation of mass and momentum. The fractured medium is modeled with the extended finite element method, and the stress intensity factor is calculated by the simple, though sufficiently accurate, displacement ex- trapolation method. To evaluate the proposed algorithm, two field tests are simulated and the unknown parameters are determined through calibration. Sensitivity analyses are performed on the main effective parameters. Considering that the level of uncertainty is very high in these types of engineering problems, the results show a good agreement with the experimental data. They are also consistent with the theory that the final crack length is mainly determined by the gas pressure rather than the initial crack length produced by the stress waves.

关键词： Gas fracturing Numerical modeling Extended finite element Fracture mechanics

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Temperature-dependent development of Neoseiulus barked （Acari： Phytoseiidae） on Tetranychus urticae （Acari： Tetranychidae） at seven constant temperatures

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Insect Science 2012年第2期19卷 220-228页

作者： Shahriar jafari Yaghoub Fathipour Farid Faraji Department of Entomology Faculty of Agriculture Tarbiat Modares University Tehran Iran MITOX Consultants Amsterdam The Netherlands

The effect of seven constant temperatures of 15, 20, 25, 27, 30, 35 and 37℃ on developmental time ofNeoseiulus barkeri Hughes were determined in laboratory conditions under 65% - 5% RH and a photoperiod of 12 ： 12 （L ： D） h on nymphal stages of Tetranychus urticae Koch. Total developmental time of females （from egg to adult emergence） at the above-mentioned temperatures was 26.59, 14.43, 6.32, 5.64, 4.59, 3.98 and 4.67 days, respectively. Developmental rate of the N. barkeri increased as temperature increased from 15 to 35℃, but declined at 37℃. A linear and two nonlinear models were fitted to developmental rate of immature stages ofN. barkeri to predict the developmental rate as a function of temperature, as well as to estimate the thermal constant （K） and critical temperatures （i.e., Tmin, Topt and Tmax）. The estimated values of the Tmin and K for total developmental time using the linear model were 12.07℃ and 86.20 degree-days （DD）, respectively. The Trnin and Tmax estimated by the Sharpe-Schoolfield-Ikemoto （SSI） model were 11.90℃ and 37.41℃, respectively. The estimated Topt for overall immature stage development ofN. barkeri by the Lactin and SSI models were 33.89℃ and 24.51℃, respectively. Based on the biological criteria of model evaluation, the linear and SSI models were found to be the best models for describing the developmental rate of overall immature stages of N. barkeri and estimating the temperature thresholds.

关键词： Neoseiulus barkeri temperature thresholds temperature-dependent development Tetranychus urticae thermal constant

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An overview of travel-associated central nervous system infectious diseases:risk assessment,general considerations and future directions

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Asian Pacific Journal of Tropical Biomedicine 2014年第8期4卷 589-596页

作者： Morteza Izadi Annan Is'haqi Mohammad ali Is'haqi Nematollah Jonaidi jafari Fatemeh Rahamaty Abdolali Banki Baqiyatallah Hospital Baqiyatallah University of Medical SciencesTehranIran Department of Neurology Tehran University of Medical SciencesTehran.Iran Department of Infectious Diseases Rasoul Akram HospitalIran University of Medical SciencesTehran Iran Department of Neurology Baqiyatallah University of Medical SciencesTehranIran

Nervous system infections are among the most important diseases in *** travellers might be exposed to infectious agents of central nervous system,which may require in-patient *** course is not uncommon in this family of disorders and requires swift *** overview of the available evidence in the field ***,Urgent to pave the way to increase the awareness of travel-medicine practitioners and highlights dark areas for future *** November 2013,data were collected from PubMed,Scopus,and Web of knowledge(1980 to2013) including books,reviews,and peer-reviewed literature,Works pertained to pre-travel care,interventions,vaccinations related neurological infections were *** we provide information on pre-travel care,vaccination,chronic nervous system disorders,and post-travel *** with regard to knowledge gaps,and state-of-the-art research are *** an increasing number of international travellers,novel dynamic ways are available for physicians to monitor spread of central nervous system *** research has made great progresses in developing newer medications,detecting the spread of infections and the public *** an ongoing scientific discussion in the field of travel medicine,further research is required for vaccine development,state-of-the-art laboratory tests,and genetic engineering of vectors.

关键词： Travel medicine Infectious diseases Nervous system disorders

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A non-fluorinated mechanochemically robust volumetric superhydrophobic nanocomposite

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Journal of Materials Science & Technology 2021年第7期66卷 213-225页

作者： E.Vazirinasab G.Momen R.jafari Department of Applied Sciences University of Quebec in Chicoutimi(UQAC)555boul.de I'universiteChicoutimiQuebecG7H 2B1Canada

The widespread use of water-repellent superhydrophobic surfaces is limited by the inherent fragility of their micro-and nanoscale roughness, which is prone to damage and degradation. Here, we report a non-fluorinated volumetric superhydrophobic nanocomposites that demonstrate mechanochemical robustness. The nanocomposites are produced through the addition of microscale diatomaceous earth and nanoscale fumed silica particles to high-temperature vulcanized silicone rubber. The water-repellency of the surface and bulk of nanocomposites having 120 phr of filler was determined based on the water contact angle and contact angle hysteresis. We compared the water-repellency of nanocomposites of differing diatomaceous earth to fumed silica mass ratios. Increasing the amount of diatomaceous earth enhanced the water-repellency of the nanocomposite surface, whereas an increased amount of fumed silica improved the water-repellency of the bulk material. Moreover, increasing the diatomaceous earth/fumed silica mass ratio improved the cross-linking density and hardness values of the *** being subjected to a range of mechanical durability tests, including sandpaper abrasion,knife scratching, tape peeling, water jet impact, and sandblasting, the nanocomposite maintained a water contact angle of 163. and contact angle hysteresis of 2°. When the water-repellency of the prepared nanocomposites eventually deteriorated, we restored their superhydrophobicity by removing the upper surface of the nanocomposite. This extraordinary robustness stems from the embedded low surface energy micro/nanostructures distributed throughout the nanocomposite. We also demonstrated the chemical stability, UV resistance, and self-cleaning abilities of the nanocomposite to illustrate the potential for real-life applications of this material.

关键词： Volumetric superhydrophobic Nanocomposite Diatomaceous earth Hierarchical micro/nanostructure Mechanical robustness Chemical stability Self-cleaning

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Effect of NiO-NiCr2O4 nano-oxides on the microstructural,mechanical and corrosion properties of Ni-coated carbon steel

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International Journal of Minerals,Metallurgy and Materials 2023年第6期30卷 1078-1092页

作者： Saeed Mojallal Hurieh Mohammadzadeh Abbas Aghaeinejad-Meybodi Robabeh jafari Materials Engineering Department Faculty of EngineeringUrmia UniversityUrmiaIran Chemical Engineering Department Faculty of EngineeringUrmia UniversityUrmiaIran

Pure Ni and its composites with different percentages of Ni-Cr nano-oxides were coated over carbon steel to assess the coating features and mechanical and corrosion behavior.A nano-oxide composite of Ni-Cr was first synthesized through chemical coprecipitation with uniform distribution *** was employed to coat pure Ni and Ni-(Ni-Cr)oxides(10,20,30,40,and 50 g/L)on the steel *** electron microscope and field emission scanning electron microscope were adopted to examine the microstructure of powders and coatings,and X-ray diffraction analysis was employed to study the chemical *** microhardness,thickness,and wear resistance of the coatings were assessed,polarization and electrochemical impedance spectroscopy(EIS)tests were conducted to analyze the corrosion behavior,and the corresponding equivalent circuit was *** showed flawless and crack-free coatings for all samples and uniform distribution of nano-oxides in the Ni matrix for the samples of 10-30 g/*** oxides were detected at high *** microhardness(HV 661),thickness(116μm),and wear resistance of coatings were found at 30 g/L.A three-loop equivalent circuit corresponded satisfactorily to all EIS *** corrosion resistance increased with the nano-oxide concentration of up to 30 g/L but decreased at 40 g/*** sample of 50 g/L showed the best corrosion resistance.

关键词： nanocomposite powder electroplating coating corrosion resistance electrochemical impedance spectroscopy wear resistance

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