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排序方式: 共有165条查询结果,搜索用时 218 毫秒
51.
Emrah Dogan Mahnaz Gumrukcuoglu Mehmet Sandalci Mucahit Opan 《Engineering Applications of Artificial Intelligence》2010,23(6):961-967
Adaptive neuro-fuzzy inference system (ANFIS) models are proposed as an alternative approach of evaporation estimation for Yuvacik Dam. This study has three objectives: (1) to develop ANFIS models to estimate daily pan evaporation from measured meteorological data; (2) to compare the ANFIS model to the multiple linear regression (MLR) model; and (3) to evaluate the potential of ANFIS model. Various combinations of daily meteorological data, namely air temperature, relative humidity, solar radiation and wind speed, are used as inputs to the ANFIS so as to evaluate the degree of effect of each of these variables on daily pan evaporation. The results of the ANFIS model are compared with MLR model. Mean square error, average absolute relative error and coefficient of determination statistics are used as comparison criteria for the evaluation of the model performances. The ANFIS technique whose inputs are solar radiation, air temperature, relative humidity and wind speed, gives mean square errors of 0.181 mm, average absolute relative errors of 9.590% mm, and determination coefficient of 0.958 for Yuvacik Dam station, respectively. Based on the comparisons, it was found that the ANFIS technique could be employed successfully in modelling evaporation process from the available climatic data. 相似文献
52.
In the current work, silica-decorated graphene oxide (SiO2@GONPs) nanohybrids were used to reinforce the jute fiber/epoxy (JF/EP) composite. Tetraethylorthosilicate (TEOS) was utilized to prepare the SiO2@GONPs using a facial route. The results of Fourier-transform infrared spectroscopy (FTIR), atomic force microscopy, and elemental X-ray mapping confirmed the successful synthesis of SiO2@GONPs nanohybrids. Herein, the effects of SiO2@GONPs loading (0, 0.1, 0.3, and 0.5 wt%) on the mechanical behavior of the JF/EP composite were investigated with emphasis on the flexural and high-velocity impact properties. The results revealed that reinforcement of matrix with 0.3 wt% SiO2@GONPs enhanced the flexural strength of the JF/EP composite by about 40%. The energy absorption capability and impact limit velocity of the 0.3 wt% SiO2@GONPs-filled JF/EP composite were 61 and 28%, respectively, higher than those of the neat specimen. Compared to the untreated-GONPs, the SiO2@GONPs nanohybrid demonstrated an evident superiority in improving the mechanical properties of the JF/EP composite at the same loading. Evaluation of the fracture surfaces of the multiscale composites revealed that the improved fiber-matrix interfacial bonding was the basic mechanism of fracture in these specimens. 相似文献
53.
Effect of processing conditions on porosity formation in cold gas dynamic spraying of copper 总被引:1,自引:0,他引:1
Saden H. Zahiri Darren Fraser Stefan Gulizia Mahnaz Jahedi 《Journal of Thermal Spray Technology》2006,15(3):422-430
The cold gas dynamics process is a promising low-temperature spray process in which particles are accelerated in a supersonic
flow before impacting with substrate to be coated. In this study the effect of spray temperature, spray pressure, and particle
size on porosity formation in cold spray coatings are investigated. Results show that an increase in spray temperature and
a decrease in particle size lead to a decline in volume fraction of porosity. Furthermore, particle velocity and particle
temperature are determined to be the significant parameters for elimination of porosity. A model is proposed for estimation
of the volume fraction of porosity for alloy of this study. 相似文献
54.
Zero‐Trans Cake Shortening: Formulation and Characterization of Physicochemical,Rheological, and Textural Properties
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Zahra Saghafi Mohammad Hossein Naeli Mahnaz Tabibiazar Azizollaah Zargaraan 《Journal of the American Oil Chemists' Society》2018,95(2):171-183
Cake shortening is an important ingredient that imparts taste and texture in the cake as the final product. Hydrogenated shortenings contain high amounts of trans fatty acids, which is considered a risk factor for obesity, cancers, and cardiovascular diseases. In this research, chemically interesterified blends of canola oil (CO) and palm stearin (PS) were recruited in order to formulate zero‐trans shortening, specifically for cake application. The optimization of shortening formulation was performed by Design‐Expert software, considering melting, congelation, textural, and rheological properties of cake shortening as responses. The formulated shortening in the weight ratio of 66.41:33.58 (PS:CO) (%, w/w) was analyzed and compared with two commercial cake shortenings in terms of fatty acid and triacylglycerol composition, slip melting point (SMP), solid fat content (SFC), and rheological and textural properties. The results showed that the formulated zero‐trans cake shortening with 0.2% trans, 47.2% saturated fatty acids, SMP of 40.9 °C, SFC of 10.51% at 37 °C, firmness of 1522.5 g, and linear viscoelastic range of 0.035% had the most acceptable criteria among cake‐shortening samples. The findings of this study offer insights into the relationship between shortening functionality and physicochemical properties and serve as a base for future studies on zero‐trans shortenings formulation. 相似文献
55.
Mahnaz Shahverdi Bahareh Baheri Mashallah Rezakazemi Elahe Motaee Toraj Mohammadi 《Polymer Engineering and Science》2013,53(7):1487-1493
Poly(vinyl alcohol) (PVA)/zeolite 4A mixed matrix composite membranes supported on polypropylene microfiltration membranes were prepared by solution casting method and crosslinked with glutaraldehyde to investigate their pervaporation (PV) separation properties of water–ethylene glycol mixtures. Scanning electron microscopy images showed homogeneous distribution of zeolite nanoparticles within the polymer matrix without any visible macroscopic voids at the zeolite–polymer interface. The PV experiments were accomplished to investigate the effects of water concentration (10–40 wt%) and temperature (60–80°C) on separation performance of the membranes. It was found out that 5 wt% loading of the 4A nanoparticles into the PVA matrix is optimal to obtain the best separation performance. The experimental results revealed that loading of zeolite 4A enhanced the membrane performance [both permeation flux (5%) and separation factor (32%) at 5 wt% zeolite loading]. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers 相似文献
56.
Peter C. King Saden H. Zahiri Mahnaz Z. Jahedi 《Journal of Thermal Spray Technology》2008,17(2):221-227
Nd2Fe14B permanent magnet/aluminum composite coatings were produced by cold spray deposition. Isotropic Nd2Fe14B powder was blended with aluminum powder to make mixtures of 20-80 vol.% Nd2Fe14B, and these mixtures were sprayed at temperatures of 200-480 °C. The hard Nd2Fe14B particles tended to fracture and fragment upon impact, while aluminum underwent severe plastic deformation, eliminating
pores, and trapping Nd2Fe14B within the coating. It was found that higher spray temperatures and finer Nd2Fe14B particle sizes improved the retention rate of Nd2Fe14B within the composite structure. This was explained from a contact mechanics viewpoint by calculating the effect of process
parameters on the rebound momentum of Nd2Fe14B particles. The magnetic properties of Nd2Fe14B remained unaffected by the cold spray process. 相似文献
57.
Taofik H. Nassan S. Zeinali HerisS.H. Noie 《International Communications in Heat and Mass Transfer》2010
The present paper is a comparison between heat transfer characteristics of Al2O3/water and CuO/water nanofluids through a square cross-section cupric duct in laminar flow under uniform heat flux. Sometimes because of pressure drop limitations the need for noncircular ducts arises in many heat transfer applications, and a testing facility has been constructed for this purpose and experimental studies were performed on both nanofluids under different nanoparticles concentrations in distilled water as a base fluid. The results indicate that a considerable heat transfer enhancement has been achieved by both nanofluids compared with base fluid. However, CuO/water nanofluid shows better heat transfer augmentation compared with Al2O3/water nanofluid through square cross-section duct. 相似文献
58.
Mahnaz M. Abdi Anuar Kassim H. N. M. Ekramul Mahmud Wan Mahmood Mat Yunus Zainal Abidin Talib Amir R. Sadrolhosseini 《Journal of Materials Science》2009,44(14):3682-3686
This work studies the electrical and optical properties of the conducting polymer composite films of polypyrrole–chitosan
(PPy–CHI). The surface plasmon resonance (SPR) technique was used to study the optical properties of PPy and PPy–CHI composite
films. Then, the values of the real and imaginary parts of the refractive indexes of PPy and PPy–CHI films were obtained by
nonlinear least square fitting using Fresnel equations for a three-layer system of SPR system. The electrical conductivity
measurements showed that the conductivity of the electrochemical prepared films improved in the presence of CHI and can be
controlled by varying the CHI amount in the composite. The thermal diffusivity of the PPy–CHI composite films was measured
by open photoacoustic spectroscopy and it has been shown that the thermal diffusivity is related to the electron migration
in the conjugation chain length. The increase in electromagnetic interference shielding effectiveness (EMI SE) with the increase
in electrical conductivity of the films is mostly from shielding by reflection rather than absorption. 相似文献
59.
The theory of photoelasticity is used to study analytically the effects of T-stress on the fringe patterns around the crack tip in mode II crack specimens. The locus of an isochromatic fringe determined
by taking into account the T-stress is compared with the locus of a fringe with no T-stress. It is shown for mode II cracks that in the presence of T-stress, the fringe loops are neither symmetric nor continuous. Asymmetric and discontinuous fringe patterns predicted in
this paper are consistent with the experimental results observed previously in photoelasticity tests. 相似文献
60.
This paper presents a new method for estimating the parameters of quarterplane two dimensional (2-D) autoregressive model based on the Levinson–Durbin algorithm. To achieve this aim, one-dimensional formulations related to Levinson–Durbin algorithm are extended to 2-D case. Online parameter estimation, capability of parameters variation detection, estimation improvement by using new data and less computational requirement are the significant advantages of the proposed method. Because of not involving complex and time consuming matrix computations, the presented method is computationally efficient. Numerical simulations are presented to show the efficiency of the proposed approach. 相似文献