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1.
The motion equations governing the dynamical behavior of a viscoelasticTimoshenko beam with finite deformation are derived and simplified byGalerkin method. The viscoelastic material is assumed to obey thethree-dimensional fractional derivative constitutive relation. Thedynamical behaviors of the simplified systems with order 1 and order 2are numerically computed and compared by using the computational methodpresented by the authors. The dynamical behaviors of the systems areuniform qualitatively, but there is a little deviation quantitatively.And the truncated system with order 1 is safer than the one of order 2.It is also shown that the lower order system is reasonable. Theinfluences of the load parameter and the fractional derivative parameter(material parameter) on the deflection of the beam are consideredrespectively. The numerical methods in nonlinear dynamics, such as phasediagram, and Poincaré section, are applied to reveal dynamical behaviorsof the nonlinear viscoelastic Timoshenko beam. There are plenty ofdynamical behaviors, such as periodicity, bifurcation, quasi-periodicityand chaos in the dynamical system. 相似文献
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Sk S. Hossain Chang-Jun Bae P. K. Roy 《International Journal of Applied Ceramic Technology》2021,18(5):1783-1791
Lightweight insulation refractories are essential for high-temperature performance to reduce energy consumption. This study investigates a new insulation material, that is, solid waste rice husk ash (RHA) derived lightweight refractory castable, replacing traditional insulation refractory brick. The RHA is generated after the burning of rice husk as biomass fuel. The RHA is used as an aggregate and alkali-extracted silica sol from RHA as a binder to fabricate the insulation castable. The nanosilica containing (~30 wt%) sol is employed to synthesize the refractory castable by varying the sol amount (2.5-12.5 wt% silica from sol). The castable specimens are cast by a vibro-caster and fired at 900-1200°C in a muffle furnace. The physic-mechanical and thermal conductivity (κ) of the castable is investigated. At 1100°C with 10 wt% dry sol retaining sample shows an excellent apparent porosity (~65%), low bulk density (~ 0.8 g/cm3), and κ (0.136 W/m k) with sustainable compressive strength (6 MPa). The acquired results are a good match with the literature (other wastes-derived insulation materials) and industrial (silica insulation brick) obtained data. These promising outcomes may inspire the refractory industries for using RHA as an aggregate and RHA extracted sol as a binder for making insulation castable. 相似文献
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固定十六烷三甲基溴化铵(CTAB)浓度为0.15 mmol/L,改变β-环糊精(β-CD)浓度,测定了β-CD/CTAB混合水溶液30℃时的表面张力,由表面张力升高段与稳定段的拐点,求出水溶液中β-CD-CTAB包合物的包合比为1.53:1.通过红外光谱确认了该包合物的存在.测定不同浓度的该包合物溶液与钠基蒙脱土相互作用8小时后的表面张力,由CTAB溶液表面张力~溶液浓度曲线求得吸附后包合物溶液中CTAB浓度,取为吸附平衡浓度,并计算CTAB在钠基蒙脱土上的吸附量,构建包合物溶液中CTAB的吸附等温线,与采用相同方法求得的CTAB的溶液吸附等温线相比,CTAB的饱和吸附量降低75%.讨论了有关的机理.此结果为阳离子表面活性剂用作驱油剂提供了新思路.图7参7. 相似文献
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Yu-YueDu Chang-JunJiang 《计算机科学技术学报》2004,19(2):0-0
Temporal colored Petri nets, an extension of temporal Petri nets, are introduced in this paper. It can distinguish the personality of individuals (tokens), describe clearly the causal and temporal relationships betwee nevents in concurrent systems, and represent elegantly certain fundamental properties of concurrent systems, such as eventuality and fairness. The use of this method is illustrated with an example of modeling and formal verification of an online stock trading system. The functional correctness of the modeled system is formally verified based on the temporal colored Petri net model and temporal assertions. Also, some main properties of the system are analyzed. It has been demonstrated sufficiently that temporal colored Petri nets can verify efficiently some time-related properties of concurrent systems, and provide both the power of dynamic representation graphically and the function of logical inference formally. Finally. future work is described. 相似文献