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排序方式: 共有346条查询结果,搜索用时 15 毫秒
61.
Mahmoodzadeh Arsalan Mohammadi Mokhtar Daraei Ako Farid Hama Ali Hunar Ismail Abdullah Abdulqadir Kameran Al-Salihi Nawzad 《Neural computing & applications》2021,33(1):321-348
Neural Computing and Applications - This research intends to use machine learning approaches to predict tunnel geology and its construction time and costs. For this purpose, the Gaussian Process... 相似文献
62.
In process planning, determining feature’s machining precedence is an essential step. The task becomes more difficult if features
interact with each other, in which case the feature precedence information may suggest multiple machining sequences of the
features. This paper considers interacting features in a feature-based model for process planning tasks. For each feature,
precedence information is generated considering both roughing and finishing operations. A rule-based system is developed and
implemented based on the information about machining precedence of the interacting features. The STEP-NC data model is used
as the underlying data model. This model is object-oriented and compliant with the existing STEP standards. The output of
the system is also in the STEP format through an information model developed using the EXPRESS language. 相似文献
63.
This work presents an experimental study to assess the performance characteristics of hydrostatic thrust bearings. A test rig is designed for testing two configurations of hydrostatic bearings compensated by a capillary tube, one with a mid-circular recess and the other with multi-sectors (four recesses of different recess radii ratios). The performance characteristics have been measured, namely, oil film thickness, recess pressure, pressure distribution and oil flow rate. A specially devised computer program using an iterative technique has been adopted to compute numerically the pressure distribution and predict other performance characteristics. Good agreement has been obtained between predicted theoretical performance and that experimentally measured. The results demonstrate that the bearing recess size and location have a great influence on the performance of the hydrostatic thrust bearing. 相似文献
64.
The frictional behaviour was experimentally investigated of alumino-silicate ceramics (3Al2O3, 2SiO2) rubbing against a hard steel surface under static and kinetic friction conditions. Tests were carried out on a pin-on-disc machine under both dry and wet contact conditions. Results showed that the frictional behaviour under either static or kinetic conditions was highly dependent on the ceramic body phase transformation which in turn was controlled by the firing temperature during ceramic processing and treatment. Lower friction values were evident when using specimens of ceramic bodies containing a high mullite crystalline phase, which are attained at high firing temperatures. Both the running speed and applied loads had insignificant effects at high loads.During kinetic friction tests lower frictional values were displayed than for static friction tests under wet contact conditions, and under dry conditions when using high mullite ceramic bodies. For specimens of ceramics fired at relatively low temperatures, kinetic friction tests produced higher frictional values than static friction tests. 相似文献
65.
Brahim Lakhrissi Loubna Lakhrissi Mohamed Massoui El Mokhtar Essassi Francesc Comelles Jordi Esquena Conxita Solans Carlos Rodríguez-Abreu 《Journal of surfactants and detergents》2010,13(3):329-338
The surface and self-aggregation properties in water of a new series of amphiphilic homologues, bis-benzimidazolone derivatives
of d-glucose, were investigated. Parameters such as the maximal surface excess concentration, minimal area per molecule at the
interface, and critical micelle concentration (CMC) were found to be significantly dependent on the hydrophobic alkyl chain
length. The synthesized compounds form micelles at remarkably low concentrations, and CMCs derived from surface tension measurements
show a minimum as a function of the alkyl chain length; this unusual trend can be attributed to the formation of submicellar
aggregates in compounds with long alkyl chains, as evidenced from fluorescence probe spectroscopy data. At high surfactant
concentrations, lyotropic liquid crystalline phases with hexagonal structure are formed. Small angle X-ray scattering measurements
indicate that the characteristic nanoscopic lengths increase with water swelling and alkyl chain length. 相似文献
66.
Effect of different starter cultures on the biogenic amines production as a critical control point in fresh fermented sausages 总被引:1,自引:1,他引:0
Sayed Mokhtar Gamal Mostafa Refat Taha Gehad Sallah Saeed Eldeep 《European Food Research and Technology》2012,235(3):527-535
The selection of critical control points is one of the most important steps in the design of a hazard analysis and critical control points system. In this study, the influence of starter culture inoculation on biogenic amine accumulation in fresh fermented sausage as critical control point was studied. The effect of three starter culture Lactobacillus plantarum plus Bifidobacterium lactis, L. plantarum plus Bifidobacterium bifidum or L. plantarum plus B. lactis and B. bifidum on amines production were investigated. Tyramine (TY), Cadaverine (CA), Putrescine (PU), Histamine (HIS) and Tryptamine (TR) contents increased during the fermentation and storage stage, and TY was the prevailing amine in the final product. Sausages produced by fermentation with starters, as compared to natural fermentation (control), had a lower amount of biogenic amine. A great reduction in biogenic amine content was achieved when Bifidobacterium sp. were inoculated, also levels of species of Enterobacteriaceae and Pseudomonas decreased, while lactic acid bacteria counts increased during fermentation and storage. 相似文献
67.
Raja Mohd Hafidz Raja Nhari Nur Fadhilah Khairil Mokhtar Irwan Hanish Muhajir Hamid Muhammad Asraf Alif Mohamed Rashidi Nur Maisarah Shahidan 《Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment》2018,35(5):807-817
Detection of porcine plasma using indirect ELISA was developed using mAb B4E1 for the prevention of their usage in human food that creates religious and health conflicts. The immunoassay has a CV < 20% and did not cross-react to other meat and non-meat proteins. The sensitivity of the assay is 0.25% (w/w) of porcine plasma in spiked raw and cooked fish surimi. The assay did not produce a false positive result for any of the commercial fish surimi tested that were not contain porcine plasma. Determination of a 60-kDa antigenic protein of porcine blood using Western blot confirmed its presence in the plasma fraction of the porcine blood. Further proteomic analysis involving liquid chromatography–tandem mass spectrometry (LC-MS/MS) revealed the 60-kDa protein to be porcine serum albumin. 相似文献
68.
69.
Mohamed Zidour Kouider Halim BenrahouAbdelwahed Semmah Mokhtar NaceriHichem Abdesselem Belhadj Karima BakhtiAbdelouahed Tounsi 《Computational Materials Science》2012,51(1):252-260
Based on nonlocal theory of thermal elasticity mechanics, a nonlocal elastic Timoshenko beam model is developed for free vibration analysis of zigzag single-walled carbon nanotube (SWCNT) considering thermal effect. The nonlocal constitutive equations of Eringen are used in the formulations. The equivalent Young’s modulus and shear modulus for zigzag SWCNT are derived using an energy-equivalent model. Results indicate significant dependence of natural frequencies on the temperature change as well as the chirality of zigzag carbon nanotube. These findings are important in mechanical design considerations of devices that use carbon nanotubes. 相似文献
70.
Smaïl Benbarek Bel Abbes Bachir Bouiadjra Bouziane Mohamed El Mokhtar Tarik Achour Boualem Serier 《Materials science & engineering. C, Materials for biological applications》2013,33(1):543-549
In this study, we use the finite element method to analyze the propagation's path of the crack in the orthopedic cement of the total hip replacement. In fact, a small python statement was incorporated with the Abaqus software to do in loop the following operations: extracting the crack propagation direction from the previous study using the maximal circumferential stresses criterion, drawing the new path, meshing and calculating again (stresses and fracture parameters). The loop is broken when the user's desired crack length is reached (number of propagations) or the value of the mode I stress intensity factor is negative. Results show that the crack propagation's path can be influenced by human body posture. The existing of a cavity in the vicinity of the crack can change its propagation path or can absolutely attract it enough to meet it. Crack can propagate in the outward direction (toward the acetabulum bone) and cannot propagate in the opposite direction, the mode I stress intensity factor increases with the crack length and that of mode II vanishes. 相似文献