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오늘 본 자료
Effects of Microwave Roasting on Physicochemical Properties of Pistachios (Pistaciavera L.)
Mohammad Hojjati,Luis Noguera-Artiaga,Aneta Wojdyło,Ángel Antonio Carbonell-Barrachina 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.6
Effects of 480 and 640 W power levels and 2, 3 and 4 min for roasting of pistachios using microwaves (MW) on the physicochemical properties of pistachios in comparison with an Iranian traditional method of soaking in salty water and drying under hot-air at 135℃ for 20 min were investigated. MW roasting of pistachios decreased water activity values, producing a softer nut. Twenty one volatile compounds were identified in roasted pistachios using GC-MS. The highest volatile concentration and sensory odor intensity scores were observed for hot air roasted pistachios and MW at 640 W for 4 min. Roasting reduced the force needed to cut pistachios. Unsaturated fatty acid contents in MW roasted pistachios were higher (82.0%) than in hot-air produced nuts (74.7%). Total phenolic content values increased with roasting time and with the MW power level. Pistachios can be successfully roasted using microwaves as a fast and economical method.
SOLVING PAINLEVE EQUATION OF TYPE 1 USING HOMOTOPY PADE METHOD
G. Hojjati,H. Kheiri,S. IRANDOUST-PAKCHIN 장전수학회 2013 Advanced Studies in Contemporary Mathematics Vol.23 No.2
In this paper we use homotopy Pad´e method for solving Painlev¢¥e equation of type 1. The ability of this method in overcoming on the singular points difficulty, makes it to be efficient method in deal with Painlev¢¥e equation.
Mohammad Hojjati,Seyed Hadi Razavi,Karamatollah Rezaei,Kambiz Gilani 한국식품과학회 2011 Food Science and Biotechnology Vol.20 No.1
Microencapsulation of canthaxanthin produced by Dietzia natronolimnaea HS-1 using soluble soybean polysaccharide (SSPS) as a wall material by spray drying method was studied. The SSPS showed very good ability for microencapsulation of canthaxanthin due to its emulsifying properties. The effects of the ratios of core to wall on characteristics of microcapsules were investigated at ratios of 0.25, 0.50, 0.75, and 1.00. The best ratio of core to wall was 0.25 because the microcapsules prepared with this ratio had the smallest size in droplets (0.78 μm) and microcapsules (7.94 μm), also they had the highest microencapsulation efficiency (90.1%) and the lowest losing during process (10.3%). The stability of microcapsules was examined at 25ºC in light and dark during 16 weeks of storage. The degradation of canthaxanthin was more retarded by microencapsulation and greater canthaxanthin stability was observed in dark than light condition. The results showed the oxidation was more suppressed for the microcapsules prepared from the emulsion having smaller droplets.
Shahabedin Hojjati,Hoyoung Jeong(정호영),Seokwon Jeon(전석원) 한국암반공학회 2018 터널과지하공간 Vol.28 No.6
본 연구에서는 유전자 프로그래밍과 개체군집최적화기법을 이용하여 픽 커터의 비에너지를 예측하기 위한 모델을 제안하였다. 기계굴착장비의 굴진성능을 평가하는 것은 터널의 설계 초기 단계에서 매우 중요하며, 비에너지를 이용한 기계 굴착장비의 굴진성능평가방법은 모든 기계굴착공법에 적용될 수 있는 표준화된 방법이다. 본 연구에서는 코니컬형상의 픽 커터가 암석을 절삭할 때 요구되는 비에너지와 암석의 강도특성, 절삭조건 간의 상관관계를 분석하고자 하였으며, 선행연구를 통해 총46개의 선형절삭시험 결과를 수집하여 분석에 활용하였다. 본 연구에서 제안한 예측모델을 이용하여 산정된 픽 커터의 비에너지는 다중선형회귀분석에 비해 작은 평균제곱오차를 나타내었으며, 결정계수 또한 본 연구에서 제안한 모델이 다중선형회귀분석에 비해 우수한 예측결과를 나타내는 것을 확인할 수 있었다. This study suggests the prediction model to estimate the specific energy of a pick cutter using a gene expression programming (GEP) and particle swarm optimization (PSO). Estimating the performance of mechanical excavators is of crucial importance in early design stage of tunnelling projects, and the specific energy (SE) based approach serves as a standard performance prediction procedure that is applicable to all excavation machines. The purpose of this research, is to investigate the relationship between UCS and BTS, penetration depth, cut spacing, and SE. A total of 46 full-scale linear cutting test results using pick cutters and different values of depth of cut and cut spacing on various rock types was collected from the previous study for the analysis. The Mean Squared Error (MSE) associated with the conventional Multiple Linear Regression (MLR) method is more than two times larger than the MSE generated by GEP-PSO algorithm. The R<SUP>2</SUP> value associated with the GEP-PSO algorithm, is about 0.13 higher than the R2 associated with MLR.
A high-order analytical method for thick composite tubes
Hamidreza Yazdani Sarvestani,Mehdi Hojjati 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.21 No.4
In the present paper, a new high-order simple-input analytical method is used to study thick laminated composite straight tubes subjected to combined axial force, torque and bending moment. The most general displacement field of elasticity for an arbitrary laminated composite straight tube is obtained to analytically calculate stresses under combined loadings based on a layerwise method. The accuracy of the proposed method is subsequently verified by comparing the numerical results obtained using the proposed method with finite element method (FEM) and experimental data. The results show good corresponded. The proposed method provides advantages in terms of computational time compared to FEM.
Maryam Kabiri,Shahriar Hojjati Emami,Mohammad Rafinia,Mohammadreza Tahriri 한국물리학회 2011 Current Applied Physics Vol.11 No.3
The aim of this study, is synthesis of an absorbable hemostat gelatin sponge crosslinked with 1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide (EDC). The effects of various gelatin contents and crosslinking agent concentrations, freezing temperature on the mechanical properties, rate of biodegradation in 24 h,hemolytic ability and cell viability of sponges were investigated. The results of scanning electron microscopy (SEM) showed that freezing temperature had a significant effect on the structure and density of sponges. SEM views of the sponges demonstrated that they have pores with mean diameters of 180―280 μm. Fourier transform infrared (FTIR) spectra indicated that there is no residual of the crosslinking agent in the structure of final gelatin sponges because of C―N bonds (urea derivatives) absence. The sample with 1% gelatin and 0.05% EDC freezed at ―25 ℃ (before freeze-drying) showed more than 0.37 cm^-1 UV absorption of hemoglobin or blood clotting in half an hour. The compression modulus of the same sample was more than 150 kPa and percentage of degradation was about 28% in 24 h.
Fatemeh Mosallaie,Hossein Jooyandeh,Mohammad Hojjati,Ali Fazlara 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.6
The present study was conducted to investigatethe ability of two probiotic strains, L. acidophilus PTCC1643 and L. rhamnosus PTCC 1637, to bind aflatoxin B1(AFB1, 20 ng/ml) in comparison with yogurt starter cultures,at equal bacterial count (* 109 LogCFU/ml) duringa 21-day storage period at 4 C. All assessed treatmentsexhibited high percentages of AFB1-binding, ranged from64.56 to 96.58%. However, the ability of probiotic bacteriawas statistically higher than yogurt starter cultures. Aflatoxinbinding ability of the selected lactic acid bacteria wasdependent on both time and bacteria species. The highestand the lowest percentages of AFB1-removal was observedat 11th day of cold storage by L. rhamnosus(96.58 ± 3.97%) and at the first day of storage for yogurtstarter cultures (64.56 ± 5.32%), respectively. The stabilityof bacterial cells-AFB1 complex was remarkable, sinceonly 0.84–26.75% of bounded AFB1 was released frombacterial cells after 3 times washing during the storageperiod.
Homotopy analysis and Homotopy Pade methods for mixed Volterra-Fredholm integral equations
S. Fazeli,H. Kheiri,G. Hojjati 장전수학회 2010 Advanced Studies in Contemporary Mathematics Vol.20 No.4
In this paper, approximate analytical solution of the mixed Volterra-Fredholm inte-gral equation is obtained by the Homotopy analysis and the Homotopy Pade methods. The obtained approximation by using Homotopy method contains an auxiliary parameter which is a simple way to control and adjust the convergence region and rate of solution series. The approximation solutions by [m,m] Homotopy Pade technique is often independent of auxiliary parameter h and this technique accelerates the convergence of the related series.