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排序方式: 共有4674条查询结果,搜索用时 31 毫秒
971.
A field‐scale analysis for leachate flow was done for Sections 1/9 and 6/7 of the Fresh Kills landfill at Staten Island, New York. The leachate monitoring programme included field data collection of the leachate mound level for a six‐month period. The monitoring points consisted of discretely screened piezometers and wells set at various depths down to the bottom of the landfill. The position of the iso‐leachate mound head lines, derived from the field data, represented and delineated the shape of the leachate mound inside the landfill. The field data of the leachate mound head were used in the analysis of the hydraulic properties of the refuse and leachate flow rates through Sections 1/9 and 6/7 of the landfill. Piezometers and wells installed near the existing leachate collection line in Section 1/9 helped establish the gradients from which a refined estimate of the hydraulic conductivity was made. From the leachate mound head contours and flow gradients, contributions of flow from different sections of the mound were identified. Finally, the leachate flow rates were computed using Darcy's law. 相似文献
972.
Toughening of MoSi2 for high-temperature applications can be achieved by incorporating ductile refractory-metal reinforcements, provided that a coating is applied to prevent interdiffusion and reaction between the matrix and the reinforcements. In the present study, three different coating techniques for applying a thin Al2 O3 film on Nb reinforcements as a diffusion barrier have been studied. The techniques consisted of (i) sol-gel coating; (ii) physical vapor deposition (PVD); (iii) hot dipping in molten Al, followed by anodizing Al to form Al2 O3 . The processing parameters for the techniques were evaluated and the effectiveness of each coating as a diffusion barrier was assessed. For the present MoSi2 matrix which contains SiO2 , PVD coatings provided the most effective diffusion barrier for processing MoSi2 /Nb composites. 相似文献
973.
Golam M. Newaz 《Composites Science and Technology》1985,24(3):199-214
A deflection-controlled flexural fatigue study of unidirectional glass fiber reinforced epoxy and vinyl ester composites was undertaken. Damage initiation and growth for various deflection levels were evaluated. Also, quantitative assessment of damage was made by monitoring stiffness loss in the composites as a function of fatigue cycles. Results show that the glass/epoxy composite has better performance compared with the glass/vinyl ester composite, especially at low deflection amplitudes. Fatigue behavior of the composites at low deflection amplitudes is found to be primarily influenced by matric and fiber-matrix interfacial damage in the form of longitudinal splitting. 相似文献
974.
Sk Hafijur Rahaman Rajarshi Ghosh Golam Mostafa Barindra Kumar Ghosh 《Inorganic chemistry communications》2005,8(12):1137-1140
A new Schiff base, N,N′-(bis(pyridin-2-yl)formylidene)ethane-1,2-diamine (bpfd) is prepared and used to synthesize a novel end-to-end thiocyanato bridged infinite 1D polymeric heptacoordinated cadmium(II) chain [Cd(bpfd)(μ1,3-NCS)(NCS)]n (1) which forms a 3D supramolecule through weak C–H…S hydrogen bonding and π…π interaction. 相似文献
975.
976.
The city of Zahedan, in South-eastern Iran, has high population growth, limited local freshwater resources and inadequate
water distribution system resulting in water supply failures in recent years. This paper will investigate integration of several
demand management measures such as leakage detection on water distribution network, water metering and low volume water fixtures
as well as the conjunctive use of surface and groundwater resources of this city. For integration of water management criteria,
compromise programming will be used as a multi-objective decision making method. The criteria include minimizing the cost,
maximizing water supply and minimizing the social hazards due to the water supply operations. This model will derive optimum
long-term plans for implementation of water resources. The results will show that demand management can delay a water transfer
project for Zahedan city up to 10 years. Compromise programming is as an efficient tool for integrated water resources management
in urban areas and the method is capable to being used by decision-makers in other cases. 相似文献
977.
Mohammad Javad Rahimdel Mohammad Ataei Reza Khalokakaei Seyed Hadi Hoseinie 《矿业科学技术学报(英文版)》2013,23(5):771-775
Hydraulic system has a critical and important role in drilling machines. Any failure in this system leads to problems in power system and machine operation. Since the failure cannot be prevented entirely, it is important to minimize its probability. Reliability is one of the most efficient and important method to study safe operation probability of hydraulic systems. In this research, the reliability of hydraulic system of four rotary drilling machines in Sarcheshmeh Copper Mine in Iran has been analyzed. The data analysis shows that the time between failures (TBF) of Machines A and C obey the Weibull (2P) and Weibull (3P) distribution, respectively. Also, the TBF of Machines B and D obey the lognormal distribution. With regard to reliability plots of hydraulic systems, preventive reliability-based maintenance time intervals for 80% reliability levels for machines in this system are 10 h. 相似文献
978.
A Fuzzy Variable Least Core Game for Inter-basin Water Resources Allocation Under Uncertainty 总被引:2,自引:1,他引:1
Keighobad Jafarzadegan Armaghan Abed-Elmdoust Reza Kerachian 《Water Resources Management》2013,27(9):3247-3260
In this paper, a new solution concept, called Fuzzy Variable Least Core (FVLC), is developed for fuzzy cooperative games. The FVLC is able to incorporate fuzzy input variables and result in fuzzy benefit shares of players participating in a coalition. This solution concept is used for water and benefit allocation to water users in inter-basin water transfer systems considering the uncertainties associated with their benefit coefficients. In the proposed water allocation methodology, an Integrated Stochastic Dynamic Programming (ISDP) model is developed to obtain the water rights of players and economic water allocation policies. In the next step, the total net fuzzy benefit of the system is reallocated to water users in an equitable and rational way using a FVLC-based model. In this model, a new algorithm is proposed for converting a multilateral cooperative game with fuzzy variables to some fuzzy bilateral cooperative games, which are solved using the FLVC solution concept. The applicability and efficiency of the proposed methodology is examined by applying it to a large scale inter-basin water transfer project in Iran. 相似文献
979.
Biomedical Applications: Engineering of Mature Human Induced Pluripotent Stem Cell‐Derived Cardiomyocytes Using Substrates with Multiscale Topography (Adv. Funct. Mater. 19/2018)
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980.
Tara Foroozan Fernando A. Soto Vitaliy Yurkiv Soroosh Sharifi‐Asl Ramasubramonian Deivanayagam Zhennan Huang Ramin Rojaee Farzad Mashayek Perla B. Balbuena Reza Shahbazian‐Yassar 《Advanced functional materials》2018,28(15)
Dendritic growth of lithium (Li) has severely impeded the practical application of Li‐metal batteries. Herein, a 3D conformal graphene oxide nanosheet (GOn) coating, confined into the woven structure of a glass fiber separator, is reported, which permits facile transport of Li‐ions thought its structure, meanwhile regulating the Li deposition. Electrochemical measurements illustrate a remarkably enhanced cycle life and stability of the Li‐metal anode, which is explained by various microscopy and modeling results. Utilizing scanning electron microscopy, focused ion beam, and optical imaging, the formation of an uniform Li film on the electrode surface in the case of GO‐modified samples is revealed. Ab initio molecular dynamics (AIMD) simulations suggest that Li‐ions initially get adsorbed to the lithiophilic GOn and then diffuse through defect sites. This delayed Li transfer eliminates the “tip effect” leading to a more homogeneous Li nucleation. Meanwhile, C? C bonds rupture observed in the GO during AIMD simulations creates more pathways for faster Li‐ions transport. In addition, phase‐field modeling demonstrates that mechanically rigid GOn coating with proper defect size (smaller than 25 nm) can physically block the anisotropic growth of Li. This new understanding is a significant step toward the employment of 2D materials for regulating the Li deposition. 相似文献