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排序方式: 共有145条查询结果,搜索用时 46 毫秒
1.
Aleksandr Drozd Olaf Witkowski Satoshi Matsuoka Takashi Ikegami 《Artificial Life and Robotics》2016,21(3):317-323
We extend an abstract agent-based swarming model based on the evolution of neural network controllers, to explore further the emergence of swarming. Our model is grounded in the ecological situation, in which agents can access some information from the environment about the resource location, but through a noisy channel. Swarming critically improves the efficiency of group foraging, by allowing agents to reach resource areas much more easily by correcting individual mistakes in group dynamics. As high levels of noise may make the emergence of collective behavior depend on a critical mass of agents, it is crucial to reach sufficient computing power to allow for the evolution of the whole set of dynamics in simulation. Since simulating neural controllers and information exchanges between agents are computationally intensive, to scale up simulations to model critical masses of individuals, the implementation requires careful optimization. We apply techniques from astrophysics known as treecodes to compute the signal propagation, and efficiently parallelize for multi-core architectures. Our results open up future research on signal-based emergent collective behavior as a valid collective strategy for uninformed search over a domain space. 相似文献
2.
Santanu Mondal Andriy Durygin Vadym Drozd Jose Belisario Zhe Cheng 《Journal of the American Ceramic Society》2020,103(9):4876-4893
In this research, near fully dense single phase bulk multicomponent transition metal nitride (Nb1/3Ta1/3Ti1/3)N1−δ has been successfully synthesized from mixed commercial powders of NbN, TaN and TiN via reaction flash sintering technique. This was performed with an applied pressure of ~ 35 MPa at 25°C under a constant DC electric field (~24-32 V/cm). The flash event, which is the abrupt increase in current (up to ~ 25.2 A/mm2) and temperature, occurred without preheating. The threshold power dissipation on the sample right before the flash is ~ 0.7 W/mm3. The formation of single phase (Nb1/3Ta1/3Ti1/3)N1−δ random solid solution and its compositional uniformity were confirmed by XRD and EDS, respectively. The effects of ball milling duration and limiting current density on phase formation were studied. Simulation based on Joule heating provides an estimate of the ultimate sample temperature of ~ 1850°C. Vickers hardness of the obtained (Nb1/3Ta1/3Ti1/3)N1−δ is 17.6 ± 0.6 GPa, which is comparable to similarly flash sintered ingredient binary nitrides of TaN and NbN. TGA in air shows that the oxidation resistance of (Nb1/3Ta1/3Ti1/3)N1−δ is better than that of TaN and NbN but inferior to TiN. The study demonstrates that reaction flash sintering can be a highly efficient technique for synthesizing bulk multicomponent ceramics for both material fundamental investigations and application development. 相似文献
3.
Lyci George Vadym DrozdAndriy Durygin Jiuhua ChenSurendra K. Saxena 《International Journal of Hydrogen Energy》2009
Mg2FeH6 was synthesized by ball milling MgH2 and Fe (2:1 molar ratio) mixture for 72 h followed by heating at 400 °C under H2 pressure. The hydride formation, its structure and homogeneity were investigated by scanning electron microscopy, X-ray diffraction, transmission electron microscopy and Raman spectroscopy. High pressure in situ synchrotron X-ray diffraction and Vienna ab initio simulation were used to determine bulk modulus of the sample. The bulk modulus of Mg2FeH6 was found to be 75.4(4) GPa by optimized experiment and 76.3 GPa by theoretical simulation. From high temperature in situ X-ray diffraction study the volumetric thermal expansion coefficient of Mg2FeH6 was found to be αv = 5.85(3) × 10−5 + 7.47(7) × 10−8 (T − To)/°C. Decomposition of Mg2FeH6 was observed at 425 °C and the decomposition products were Mg, Fe and H2. 相似文献
4.
We describe the application of a local discontinuous Galerkin method to the numerical solution of the three-dimensional shallow water equations. The shallow water equations are used to model surface water flows where the hydrostatic pressure assumption is valid. The authors recently developed a DG\linebreak method for the depth-integrated shallow water equations. The method described here is an extension of these ideas to non-depth-integrated models. The method and its implementation are discussed, followed by numerical examples on several test problems.This revised version was published online in July 2005 with corrected volume and issue numbers. 相似文献
5.
P. P. Krivoruchko B. G. Alapin É. V. Degtyareva V. I. Drozd 《Refractories and Industrial Ceramics》1980,21(7-8):441-444
Conclusions The effect of a medium with a variable partial pressure of oxygen on the sintering at 1300°C of SnO2, both pure and with some additions, has been studied. The sintering of pure SnO2 is not activated at lower pO2 while the volatility of the material sharply increases when pO2<10 Pa.With the addition of sintering additives to the SnO2, the compaction of the material is markedly improved with a reduction in pO2; this is particularly so when variable-valence oxides (V, Mn, Sb) are used. The change in the valence state on reduction helps the additional solubility of these ions in the SnO2 lattice.Translated from Ogneupory, No. 8, pp. 48–51, August, 1980. 相似文献
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8.
Nishad A. Phatak Shrinivas R. Kulkarni Vadym Drozd Surendra K. Saxena Liwei Deng Yingwei Fei Jingzhu Hu Wei Luo Rajeev Ahuja 《Journal of Alloys and Compounds》2008,463(1-2):220-225
Mn+1AXn compounds have gathered huge momentum because of its exciting properties. In this paper we report the synthesis of ternary layered ceramic Cr2GeC, a 211 Mn+1AXn compound by hot-pressing. Scanning electron microscopy and X-ray diffraction have been employed to characterize the new synthesized phase. High-pressure compressibility of Cr2GeC were measured using diamond anvil cell and synchrotron radiation at room temperature up to 48 GPa. No phase transformation was observed in the experimental pressure range. The bulk modulus of Cr2GeC calculated using the Birch–Murnaghan equation of state is 169 ± 3 GPa, with K′ = 3.05 ± 0.15. 相似文献
9.
R. Nüssl T. Jewula C. Binninger R. Drozd W. Ruile D. Beckmeier T. Sulima I. Eisele W. Hansch 《Materials Characterization》2010,61(11):1054-1060
To explore mechanical stress durability of thin aluminum–scandium (AlSc) films, 0.86 GHz nano resonators with AlSc electrodes have been manufactured. Four different samples have been prepared altering the Sc content in the alloy between 0.0% and 2.5%. A final lift-off step accomplished manufacture procedure of the devices. The resonators have been operated with heavy load to determine power durability. The resonators with AlSc electrodes show increased power durability compared to conventional Al metallized devices. Texture and grain structure of all films have been investigated by means of electron backscatter diffraction (EBSD) and atomic force microscopy (AFM). Material fatigue of electrodes has been visualized by scanning electron microscopy (SEM). The refined grain structure of these alloys can explain the enhanced mechanical stress durability of AlSc electrodes. 相似文献
10.
Babkina L. A. Drozd V. I. Khonchik I. V. Zinchenko V. L. Nikulina L. N. Stepanyuk N. A. 《Refractories and Industrial Ceramics》2001,42(9-10):372-373
Studies are conducted to develop the optimum composition of a mullite-corundum mortar for cementing mullite-corundum engineering components. It is shown that the optimum composition for cementing vibrocast components of complex configuration is the MMK85-1-grade mullite-corundum mortar (TU U 14-7-178–99 Specifications) based on a phosphate binder. A technique is proposed by which unburnt components, preliminarily dried and calcined, are cemented into a one-piece product of particularly complex configuration. 相似文献