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Effect of Chromite-Silica Sands Characteristics on Performance of Ladle Filler Sands for Continuous Casting

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Journal of Iron and Steel Research International 2012年第3期19卷 11-13,19页

作者： F Farshidfar m.ghassemi Kakroudi materials Science and Engineering Department University of Tabriz

Free opening rate is mainly determined by the performance of the ladle filler sand. High free opening rates of ladles are required in steel making to improve steel quality. Chromite ladle filler sands are one of the most widely used ladle filler sand. Several operative variables and materials characteristics affect the performance of the sands. Three sets of chromite ladle filler sands were selected and researches were focused on the sintering hehaviour and per- formance of the sands under operative conditions. The effect of particle size distribution on sintering, microstruc- ture, flowability, and permeability were presented. In all cases, the particle size varies from 0.1 to 1.5 mm corre- sponding to free flowing powders. One of the samples has higher permeability factor in comparison with others due to low particle size distribution. The other sample presents very good free opening due to its very good flowability and permeability factor.

关键词： nozzle filler sand chromite based sand sintering behavior penetration depth

Compensation of stress intensity factors in hollow cylinders containing several cracks under torsion by electro-elastic coating

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Applied mathematics and mechanics(English Edition) 2019年第9期40卷 1335-1360页

作者： m. KARImI A. ghassemi A. ATRIAN m. VAHABI Department of mechanical Engineering Najafabad Branch Islamic Azad University Najafabad Iran modern manufacturing Technologies Research Center Najafabad Branch Islamic Azad University Najafabad Iran

In this article, a formulation for a hollow cylinder reinforced with an electroelastic layer is investigated. The hollow cylinder and its electro-elastic coating are under the Saint-Venant torsional loading. First, the solution to the problem containing a Volterra-type screw dislocation is obtained by using the Fourier transform. The problem is then reduced to a set of Cauchy singular integral equations by the distributed dislocation method. Finally, several examples are presented to show the effect of the electro-elastic coating on the reduction of the stress intensity factors at the crack tips.

关键词： hollow cylinder electro-elastic coating stress intensity factor multiple arbitrarily oriented cracks Saint-Venant torsion electric displacement

Numerical simulation of heavy fuel oil atomization using a pulsed pressure-swirl injector

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Chinese Journal of Chemical Engineering 2021年第4期34卷 61-69页

作者： S.m.A.Najafi P.mikaniki H.ghassemi School of mechanical Engineering Iran University of Science and TechnologyP.O.B.16765-163TehranIran

It is known that increasing the injection pressure reduces the breakup length and the droplet *** pulses,on the other hand,helps to atomize the liquid into finer droplets,similar to airassisted injectors but without altering the airtofuel *** further reduce the droplet size and breakup length,a novel injector type,called''Pulsed PressureSwirl"(PPS),is introduced in this work,which is a combination of pressureswirl and ultrasonic pulsed injectors.A pressureswirl atomizer was designed and fabricated specifically for mazut HFO(Heavy Fuel Oil).The droplet formation process and droplet size distribution have been studied experimentally(by shadowgraphy high speed imaging)and numerically(with the opensource VolumeofFluid code Gerris).Changing liquid injection pressure effect on the spray angle and film thickness has been *** simulations have been used to study the primary breakup process and quantify the droplet size distributions,using different injection pulse frequencies and *** numerical results have revealed that the new injector concept successfully produces finer droplets and results in a decrease in the breakup length,especially when applying high pulse frequencies,with no significant changes in the spray angle.

关键词： Spray Heavy fuel oil mazut Atomization Pulsed Pressure-Swirl Injector

microscopic and macroscopic atomization characteristics of a pressure-swirl atomizer, injecting a viscous fuel oil

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Chinese Journal of Chemical Engineering 2020年第1期28卷 9-22页

作者： Seyed mohammad Ali Najafi Pouria mikaniki Hojat ghassemi School of mechanical Engineering Iran University of Science and Technology(IUST)P.O.B.16765-163TehranIran

Combustion of heavy fuels is one of the main sources of greenhouse gases, particulate emissions, ashes, NOxand SOx. Gasification is an advanced and environmentally friendly process that generates combustible and clean gas products such as hydrogen. Some entrained flow gasifiers operate with Heavy Fuel Oil(HFO) feedstock. In this application, HFO atomization is very important in determining the performance and efficiency of the *** atomization characteristics of HFO(mazut) discharging from a pressure-swirl atomizer(PSA) are studied for different pressures difference(Δp) and temperatures in the atmospheric ambient. The investigated parameters include atomizer mass flow rate( _m), discharge coefficient(CD), spray cone angle(θ), breakup length(Lb), the unstable wavelength of undulations on the liquid sheet(λs), global and local SmD(sauter mean diameter) and size distribution of droplets. The characteristics of mazut sheet breakup are deduced from the shadowgraph technique. The experiments on mazut film breakup were compared with the predictions obtained from the liquid film breakup model. Validity of the theory for predicting maximum unstable wavelength was investigated for HFO(as a highly viscous liquid). A modification on the formulation of maximum unstable wavelength was presented for HFO. SmD decreases by getting far from the atomizer. The measurement for SmD and θ were compared with the available correlations. The comparisons of the available correlations with the measurements of SmD andθ show a good agreement for Ballester and Varde correlations, respectively. The results show that the experimental sizing data could be presented by Rosin-Rammler distributions very well at different pressure difference and temperatures.

关键词： Gasifier Heavy fuel oil Atomization Pressure-swirl atomizer mazut Size distribution Wavelength Viscosity

Experimental study of a heavy fuel oil atomization by pressure-swirl injector in the application of entrained flow gasifier

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Chinese Journal of Chemical Engineering 2019年第4期27卷 765-771页

作者： Pouria mikaniki Seyed mohammad Ali Najafi Hojat ghassemi School of mechanical Engineering Iran University of Science and Technology

The available SmD(Sauter mean diameter) correlations on pressure-swirl injectors predict droplet sizing very different from each other, especially for heavy fuels. Also there was a lack in the literature for comparing available correlations. So an experimental study was conducted on a heavy fuel oil(HFO) spray, mazut 380. A pressure swirl injector was designed and fabricated. The experiments for mazut at 40℃ and 80℃ were compared with the results for water, including spray half cone angle, breakup length and mean droplet diameter,at different injection pressures. Lower spray angle, higher breakup length and larger droplets were observed for lower injection pressures and higher liquid viscosity. SmD was about 75 μm for water and about 87 μm for mazut at 80℃. The results for droplet mean diameter were also compared with correlations from previous studies on pressure swirl atomizers. The SmD results show that for water spray, LISA method was in good agreement,also Babu and Ballester correlations were successful when high viscosity fluid was injected.

关键词： Atomization Pressure-swirl injector mazut Size distribution Fuel Viscosity

Using artificial neural network to predict velocity of sound in liquid water as a function of ambient temperature, electrical and magnetic fields

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Journal of Ocean Engineering and Science 2016年第3期1卷 203-211页

作者： Hashem Nowruzi Hassan ghassemi Department of Ocean Engineering Amirkabir University of Technology(Tehran Polytechnic)TehranIran

One of the main thermophysical properties of liquid water is velocity of ***,the effect of different externalities on velocity of sound in liquid water is not well ***,in current study,by designing an artificial neural network(ANN)velocity of sound in liquid water under different externalities is *** externalities are ambient temperature from 272.65 K to 348.43 K,different electrical fields in range of 0 V/m to 4.03E+9 V/m and magnetic fields in range of 0-10.0594 *** prepare of reference dataset for entry to ANN,numerical and experimental data as macroscopic reference data are extracted from microscopic characteristic of water HB *** order to achieve an appropriate ANN,ANN architecture sensitivity analysis is conducted by using an iterative *** procedure in the selected feed-forward back propagation ANN is done by hyperbolic transfer ***,Levenberg-marquardt algorithm is utilized for the optimization *** output showed that the maximum mSE in prediction of velocity of sound is ***,the minimum of correlation coefficient in prediction of velocity of sound is *** on the ANNs outputs,weights and bias,an equation to predict of velocity of sound in liquid water under intended externalities is ***,according to weight sensitivity analysis input of electrical fields with 63%relative importance percentage has a grater impression on the response variable of velocity of sound in liquid water.©2016 Shanghai Jiaotong *** by Elsevier B.V.

关键词： Artificial neural network Electrical field magnetic field Velocity of sound Temperature

Scalable nanolaminated SERS multiwell cell culture assay

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microsystems & Nanoengineering 2020年第1期6卷 916-926页

作者： Xiang Ren Wonil Nam Parham.ghassemi Jeannine S.Strobl Inyoung Kim Wei Zhou masoud Agah Bradley Department of Electrical and Computer Engineering Virginia TechBlacksburgVA 24061USA Department of Statistics Virginia TechBlacksburgVA 24061USA

This paper presents a new cell culture platform enabling label-free surface-enhanced Raman spectroscopy(SERS)analysis of biological *** platform integrates a multilayered metal-insulator-metal nanolaminated SERS substrate and polydimethylsiloxane(PDmS)multiwells for the simultaneous analysis of cultured *** cell lines,including breast normal and cancer cells and prostate cancer cells,were used to validate the applicability of this unique *** cell lines were cultured in different *** Raman spectra of over 100 cells from each cell line were collected and analyzed after 12h of introducing the cells to the *** unique Raman spectra of each cell line yielded biomarkers for identifying cancerous and normal cells.A kernel-based machine learning algorithm was used to extract the high-dimensional variables from the Raman ***,the nonnegative garrote on a kernel machine classifier is a hybrid approach with a mixed nonparametric model that considers the nonlinear relationships between the higher-dimension *** breast cancer cell lines and normal breast epithelial cells were distinguished with an accuracy close to 90%.The prediction rate between breast cancer cells and prostate cancer cells reached 94%.Four blind test groups were used to evaluate the prediction power of the SERS *** peak intensities at the selected Raman shifts of the testing groups were selected and compared with the training groups used in the machine learning *** blind testing groups were correctly predicted 100% of the time,demonstrating the applicability of the multiwell SERS array for analyzing cell populations for cancer research.

关键词： laminated culture prediction

Epistaxis in end stage liver disease masquerading as severe upper gastrointestinal hemorrhage

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World Journal of Gastroenterology 2014年第38期20卷 13993-13998页

作者： marine Camus Dennis m Jensen Jason D matthews Gordon V Ohning Thomas O Kovacs Rome Jutabha Kevin A ghassemi Gustavo A machicado Gareth S Dulai CURE Hemostasis Research Group CURE Digestive Diseases Research CenterDavid Geffen School of Medicine at University of California Division of Digestive Diseases at University of California Los AngelesRonald Reagan Medical Center Department of Gastroenterology Lariboisiere Hospital CURE Hemostasis Research Group CURE Digestive Diseases Research CenterDavid Geffen School of Medicine at University of CaliforniaLos AngelesLos AngelesCA 90095United States Gastroenterology Division at VA Greater Los Angeles Healthcare System Hunterdon Gastrointestinal Associates

AIm: To describe the prevalence, diagnosis, treatment, and outcomes of end stage liver disease (ESLD) patients with severe epistaxis thought to be severe upper gastrointestinal hemorrhage (UGIH).

关键词： Epistaxis Upper gastrointestinal bleeding End stage liver disease Cirrhosis Nasogastric tube Liver transplantation Digestive bleeding Nasal packing Coagulopathy

Vitamin A supplementation downregulates ADH1C and ALDH1A1 mRNA expression in weaned beef calves

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Animal Nutrition 2022年第3期10卷 372-381页

作者： Xue Cheng Jin Dong Qiao Peng Seong Jin Kim Na Yeon Kim Jalil ghassemi Nejad Danil Kim Stephen B.Smith Hong Gu Lee Department of Animal Science and Technology Sanghvi College of Life SciencesKonkuk UniversitySeoul 05029Republic of Korea Asia Pacific Ruminant Institute Icheon 17385Republic of Korea Farm Animal Clinical Training and Research Center Institute of Green-Bio Science and TechnologySeoul National UniversityPyeongchang 25354Republic of Korea Department of Animal Science Texas A&M UniversityCollege StationTX 77843USA

Our previous studies demonstrated that oral vitamin A supplementation during late-stage pregnancy and the neonatal stage enhances birth weight,growth performance,and mRNA expression related to muscle and preadipocyte development in beef *** alcohol dehydrogenase 1C(ADH1C)c.-64T>C genotype also correlated with vitamin A concentration in beef *** study aimed to investigate the effects of vitamin A supplementation on the muscle development and vitamin A metabolism in weaned beef calves with different ADH1C *** male calves(90 d of age;initial BW:89.03 kg[SD 8.60])were stratified according to ADH1C genotype and vitamin A treatment(duration:3 months)and randomly assigned to 4 groups with a 22 factorial *** A treatments included the following:control(10,000 IU/kg of as-fed,*** type;*** type);treatment(40,000 IU/kg of as-fed,*** type;and *** type).Parameters including BW,FI,blood,longissimus dorsi muscle,and liver status during the experimental period were analyzed using the generalized linear model(GLm)procedure and Tukey's test by SAS 9.4 *** vitamin A was significantly increased(Pmin A treatment group at 4 and 6 months of *** type calves showed higher serum vitamin A concentration(Pment group compared with the control at 6 months of ***,BW,ADG and FI showed no differences between the *** addition,mRNA expression in longissimus dorsi muscle revealed upregulation of paired box 7(PAX7)(Pmin A treatment period based on biopsy *** ADH1C and aldehyde dehydrogenase(ALDH)1A1 mRNA expression was downregulated(Pmin A *** TC type of ADH1C showed higher mRNA expression than the TT ***,no effect was observed on adipogenic mRNA expression(preadipocyte factor-1[PREF-1],peroxisome proliferator-activated rece

关键词： Vitamin A ADH1C genotype muscle development Korean native calves