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排序方式: 共有58条查询结果,搜索用时 10 毫秒
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Paramasivam Anandakumar Mallina Venkata Timmaraju Ramachandran Velmurugan 《应用聚合物科学杂志》2024,141(4):e54845
Design of automotive components with over-molded short/continuous fiber reinforced thermoplastic composites necessitates understanding of their behavior under extreme outdoor conditions. The short, quasi-isotropic and over-molded short/continuous glass fiber reinforced polypropylene (PP) composite specimens were prepared as per standard and immersed in water until equilibration to study their relative moisture absorption characteristics and consequent mechanical behavior. As the absorbed moisture mostly occupied the interface between fiber and matrix in laminated composite inserts and moisture absorption of short fiber composite core is insignificant, the moisture absorption of over-molded composites is just above 50% of that of laminated composites. The flexural, interlaminar shear and impact behavior of equilibrated composites is primarily governed by the quantum of imbibed moisture of composite materials. Optical analysis of failed moisture equilibrated over-molded specimens showed a marginal delamination between plies of the inserts without any perceptible damage within the short fiber composite similar to dry as molded specimens. 相似文献
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A. Zarei Hanzaki Ph.D. Student R. Pandi Ph.D. Student P. D. Hodgson S. Yue 《Metallurgical and Materials Transactions A》1993,24(12):2657-2665
In the processing of steel, the design of any kind of heat treatment and/or thermomechanical processing schedule, to obtain
a given microstructure, is greatly facilitated by the knowledge of the austenite-to-ferrite transformation characteristics.
In the past, isothermal and continuous cooling tests were used in the laboratory to create time-temperature-transformation
and continuous cooling transformation diagrams, respectively, which then served as the source of transformation data. The
problem with such information is that it is only truly applicable to one particular microstructure, usually one resulting
from a simple reheating cycle in the austenite region. Most industrial steel processing operations additionally involve several
stages of high-temperature deformation leading to changes in the microstructure emerging from the final pass. To account for
this situation, a novel laboratory method for the determination of the transformation characteristics, based on continuous
cooling deformation testing, was developed. A major attraction of this test technique is that the specific microstructure,
for which the transformation characteristics are required, can be generated by hot deformation and then immediately evaluated
by continuous cooling deformation. In this article, the basic continuous cooling deformation test technique and general methods
of data analysis are illustrated, using results from several different grades of steel.
Formerly with the Department of Mining and Metallurgical Engineering, McGill University 相似文献
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This paper investigates what impact optical node failures may have on wavelength-division-multiplexed networks, in which reliable end-to-end optical circuits are provisioned dynamically. At the node level, the optical cross-connect (OXC) equipment availability measure is estimated using proven component level availability models. At the network level, end-to-end optical circuits are provisioned only when the level of connection availability required by the application can be guaranteed. With the objective of yielding efficient utilization of the network resources, i.e., fibers and OXCs, circuit redundancy is achieved by means of shared path protection (SPP) switching, in combination with differentiated reliability (DiR). The resulting optimal routing and wavelength assignment problem is proven to be NP-complete. To produce suboptimal solutions in polynomial time, a heuristic technique is presented, which makes use of a time-efficient method to estimate the end-to-end circuit availability in the presence of multiple (link and node) failures. Using the proposed heuristic, a selection of representative OXC architectures and optical switching technologies is examined to assess the influence of the node equipment choice on the overall network performance. 相似文献
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A novel stochastic optimisation approach to solve constrained economic load dispatch problem using hybrid bacterial foraging (BF) technique is presented. in order to explore the search space for finding the local minima of the current location, the simplex algorithm called nelder-mead is used along with BF algorithm. the proposed methodology easily takes care of solving non-convex economic dispatch problems along with different constraints such as transmission losses, dynamic operation constraints (ramp rate limits) and prohibited zones. simulations were performed over various standard test systems with different number of generating units and comparisons are performed with other existing relevant approaches. the findings affirmed the robustness and proficiency of proposed methodology over other existing techniques. 相似文献
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Haldorai Anandakumar Ramu Arulmurugan Chow Chee-Onn 《Mobile Networks and Applications》2019,24(1):221-223
Mobile Networks and Applications - 相似文献
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Thermal stresses and probability of failure of a functionally graded solid oxide fuel cell (SOFC) are investigated using graded finite elements. Two types of anode-supported SOFCs with different cathode materials are considered: NiO-YSZ/YSZ/LSM and NiO-YSZ/YSZ/GDC-LSCF. Thermal stresses are significantly reduced in a functionally graded SOFC as compared with a conventional layered SOFC when they are subject to spatially uniform and non-uniform temperature loads. Stress discontinuities are observed across the interfaces between the electrodes and the electrolyte for the layered SOFC due to material discontinuity. The total probability of failure is also computed using the Weibull analysis. For the regions of graded electrodes, we considered the gradation of mechanical properties (such as Young’s modulus, the Poisson’s ratio, the thermal expansion coefficient) and Weibull parameters (such as the characteristic strength and the Weibull modulus). A functionally graded SOFC showed the least probability of failure based on the continuum mechanics approach used herein. 相似文献
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R. Pandiselvam Anjineyulu Kothakota V. Thirupathi S. Anandakumar P. Krishnakumar 《臭氧:科学与工程》2017,39(1):54-60
The new fumigant ozone offers an alternative to contact insecticides such as phosphine and methyl bromide as a grain fumigant. This study was carried out to test the flow characteristics of ozone from points of release to the available concentration of ozone to kill pests at other areas along the storage bin. A mass transfer model which predicts ozone concentration as a function of time was applied along with continuity equation to simulate the ozone transfer in a storage bin. Ozone exchange rate based on grain bed thickness was taken into account and evaluated using the correlation developed during the experiment. The relative error between the experimental and predicted ozone concentration values for the entire bin geometry was less than 25.7%. Overall, the general trends of measured ozone concentration were compatible with the simulated ones. 相似文献