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Valery Ivanovich ELFIMOV Hamid KHAKZAD 《水科学与水工程》2014,7(3):267-276
In this study, the performance of the extended shallow water model (ESWM) in evaluation of the flow regime of turbidity currents entering the Dez Reservoir was investigated. The continuity equations for fluid and particles and the Navier-Stokes equations govern the entire flow of turbidity currents. The shallow water equations governing the flow of the depositing phase of turbidity currents are derived from these equations. A case study was conducted on the flow regime of turbidity currents entering the Dez Reservoir in Iran from January 2002 to July 2003. Facing a serious sedimentation problem, the dead storage of the Dez Reservoir will be full in the coming 10 years, and the inflowing water in the hydropower conduit system is now becoming turbid. Based on the values of the dimensionless friction number ( Nf ≤1 ) and dimensionless entrainment number ( NE≤ 1 ) of turbidity currents, and the coefficient of determination between the observed and predicted deposit depths (R2 = 0.86) for the flow regime of negligible friction and negligible entrainment (NFNE), the flow regime of turbidity currents coming into the Dez Reservoir is considered to be NFNE. The results suggest that the ESWM is an appropriate approach for evaluation of the flow regime of turbidity currents in dam reservoirs where the characteristics of turbidity currents, such as the deposit depth, must be evaluated. 相似文献
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Krivosheina Marina Nikolaevna Kobenko Sergey Viktorovich Kashin Oleg Aleksandrovich Lotkov Aleksander Ivanovich Khon Yurii Andreevich 《Materials Science & Technology》2019,35(7):823-830
The paper is present 3D numerical simulation data on elastoplastic deformation in auxetic single crystals with account of anisotropic pressure. The use of anisotropic pressure allows us to demonstrate the absence of shock wave splitting into an elastic precursor and a plastic wave in a Zn single crystal in the loading direction [0001]. This effect in Zn single crystals is observed in full-scale experiments at any loading rate in the [0001] direction. It is shown that anisotropic pressure should be entered into mathematical models of materials whose elastic properties are characterised by five and more independent elastic constants and hence by bulk compression anisotropy. The use of isotropic pressure in simulating the deformation of such materials leads to nonphysical results. 相似文献
14.
Gennady Ivanovich Churilov Svetlana Dmitrievna Polishchuk Anna Anatolievna Nazarova 《材料科学与工程:中英文B版...》2013,(6):379-385
They have conducted the research to identify the possibility of increasing the abiotic polymerization intensity and efficiency both in the organism and in animals' muscular tissue. These tasks can be partially solved in a case of biogenous nano-metals usage such as cuprum and cobalt when adding them to the fodder. To estimate the meat productivity indexes they have formed black and white bull-calves groups. The nano-crystal cobalt ration additive for experimental bull-calves has led to live weight increase in 2 months per 6%, in 4 months per 4.8%, in 8 months per 11.7% and in 12 months per 19% in comparison with the controlled group. Amino-transferases content depending on the nano-metal has increased by the end of the experiment from 2.4% to 8.8% on retention of de Rittis index within the physiological norm. Essential amino acids content in blood has increased per 8%-13% One can also see mineral substances increase in animals' muscular tissue. Estimation of meat chemical content and some quantitative indexes of meat productivity prove the conclusion about the positive influence of cuprum and cobalt nano-powders fodder additives. 相似文献
15.
Ivanovich M. Zukerman M. Fitzpatrick P. Gitlits M. 《Vehicular Technology, IEEE Transactions on》1998,47(3):790-797
This paper considers three circuit allocation schemes for half- and full-rate connections in the Global system for Mobile Communications (GSM): best fit, repacking, and fair repacking. Analytic numerical methods are used to investigate each scheme's blocking probability behavior. The analysis is based on a reduction of the state space to a manageable size. Fair repacking is found to be the fairest and most efficient. However, the best-fit scheme, while being somewhat less efficient and fair, is simpler to implement. The effect on quality of service (QoS) of voice dropouts related to intracell handover (repacking) was found to be negligible 相似文献
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Ivan Fiodorovich Gorlov Evgeniy Ivanovich Titov Gennadiy Viacheslavovich Semenov Marina Ivanovna Slozhenkina Aleksandr Yurievich Sokolov Ruslan Saferbegovich Omarov 《International Journal of Food Properties》2018,21(1):1031-1042
This paper presents a study of the processing of collagen-containing raw material and its changes in the course of targeted complex processing by hydrolysis, including freeze-drying. The pH, chemical composition, penetration magnitude, and critical shear stress were determined. The dried samples were examined using Fourier-transform infrared spectroscopy, and their microstructures were characterized. The characteristic property of the product developed was determined to be the presence of a relatively homogeneous fibrillar structure that promotes the functional capacity of the proteinoid-forming fibres in the compositions of foods from different groups. 相似文献
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变型蔡氏电路的混沌保密通信 总被引:1,自引:0,他引:1
为了产生更复杂的混沌系统,使通信更安全可靠,设计了一种产生丰富混沌行为的变型蔡氏电路,并进行了理论分析和计算机仿真.在此基础上根据驱动-响应同步原理设计了混沌保密通信电路,以方波作为输入信号进行了相应的硬件实验研究,给出了通信系统中各元件的参数和各部分的波形.结果表明:电路实验结果与计算机模拟结果完全符合,并且在响应电路和驱动电路的元件参数一致,其相对误差小于1%的条件下,当输入方波信号频率在约8 kHz~9 MHz时,该变型蔡氏电路的混沌保密通信系统可以实现保密通信. 相似文献
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Cameron Fraser Zukerman Moshe Ivanovich Milosh Saravanabavananthan Sivathasan Hewawasam Ranil 《Wireless Networks》2000,6(5):391-399
Many modern multi‐service medium access protocols (MACs) use a collision based capacity request signaling channel as part
of a hybrid TDMA frame structure. Multi‐slot Stack Random Access Algorithm (msSTART) is proposed for use in IEEE 802.14 hybrid
fiber/coaxial network and will be highly relevant for the S‐MAC development of evolving WATM MAC specifications. This paper
studies the performance of msSTART as an example of a Q‐ary tree contention resolution algorithm (CRA) in the wireless environment
using the novel Basic Deadlock model. We contrast approximate results for msSTART performance obtained by simulation under
extreme inter‐station correlation with analytical results for the more popular p‐persistence CRA used in several testbed WATM
implementations. Using three signaling channel schemes designed to provide support for increased system stability, to implement
priority in the wireless MAC, and maximise efficiency, we provide comparative results for evaluation of msSTART and p‐persistence
ALOHA under what the IEEE 802.14 working group has termed the “disaster scenario”. We find that of the three schemes evaluated
the full Contention Mini‐Slot (CMS) sharing scheme employing multiple CMSs per data region extends the protocol's useable
load region the furthest. We conclude that Q‐ary tree contention resolution algorithms (in particular msSTART) are best adapted
to the wireless environment, providing less case sensitive performance.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献