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Global bifurcations and multi-pulse chaotic dynamics for a simply supported rectangular thin plate are studied by the extended Melnikov method. The rectangular thin plate is subject to transversal and in-plane excitation. A two-degree-of-freedom nonlinear nonautonomous system governing equations of motion for the rectangular thin plate is derived by the von Karman type equation and the Galerkin approach. A one-toone internal resonance is considered. An averaged equation is obtained with a multi-scale method. After transforming the averaged equation into a standard form, the extended Melnikov method is used to show the existence of multi-pulse chaotic dynamics, which can be used to explain the mechanism of modal interactions of thin plates. A method for calculating the Melnikov function is given without an explicit analytical expression of homoclinic orbits. Furthermore, restrictions on the damping, excitation, and detuning parameters are obtained, under which the multi-pulse chaotic dynamics is expected. The results of numerical simulations are also given to indicate the existence of small amplitude multi-pulse chaotic responses for the rectangular thin plate.

作为演绎于语言场域的修辞范式，视觉顶针的审美实践依循于这一辞格自身的形式逻辑，而图像不同于语言的形式特征及其现代视觉文本的表征结构，赋予了视觉顶针更为多元的实践形态。它在呈现顶针辞格视觉生产独特景观的同时，也将现代视觉叙事的技术机制与跨媒介结构，以及现代视觉的叙事语境与日常生活的审美化图式纳入这一辞格的动因体例进行考察，进而在确证这一辞格合法身份的基础上为现代视觉辞格谱系的确立提供了可行性依据。

Based on the tropical cyclone（TC） observations in the western North Pacific from 2000 to 2008, this paper adopts the particle swarm optimization（PSO） algorithm of evolutionary computation to optimize one comprehensive classification rule, and apply the optimized classification rule to the forecasting of TC intensity change. In the process of the optimization, the strategy of hierarchical pruning has been adopted in the PSO algorithm to narrow the search area,and thus to enhance the local search ability, i.e. hierarchical PSO algorithm. The TC intensity classification rule involves core attributes including 12-HMWS, MPI, and Rainrate which play vital roles in TC intensity change. The testing accuracy using the new mined rule by hierarchical PSO algorithm reaches 89.6%. The current study shows that the novel classification method for TC intensity change analysis based on hierarchic PSO algorithm is not only easy to explain the source of rule core attributes, but also has great potential to improve the forecasting of TC intensity change.

The orientation strategy of side pipe and the heat transfer performance of six ground heat exchangers （GHEs） were optimized by numerical simulation, with soil being treated as a porous medium. An experiment on the heat transfer of four GHEs was carried out in 2010. Results indicate that the velocity field is disturbed by GHEs. The optimal orientation strategy of side pipe is that the upward pipe is located upstream and the downward pipe down- stream. The space between GHEs should be appropriately adjusted, depending on the direction and flow velocity. Groups of GHEs should be installed perpendicular to the mainstream in a single row, but if the acreage does not meet the requirements, GHEs should be installed in staggered multiple rows. Fewer GHEs parallel to the mainstream strengthen the heat transfer. Moreover, numerical results agree well with the test data, with the maximum relative error being less than 7.7%.

With isopentane as working fluid, the heat transfer performances for corrugated, nodal and horizontal grain tubes are simulated. The structural parameters of the three kinds of tubes are compared with those of the plain tube. The numerical results using computational fluid dynamics are validated with theoretical values. For the corrugated, nodal and horizontal grain tubes, the heat transfer enhancements （HTEs） are 2.31-2.53, 1.18-1.86 and 1.02-1.31 times of those of the plain tube, respectively. However, the improved HTEs are at the expense of pressure losses. The drag coefficients are 6.10-7.09, 2.06-11.03 and 0.53-1.83 higher, respectively. From the viewpoint of comprehensive heat transfer factor, the corrugated tube is recommended for engineering applications, followed by the horizontal grain tube.

Feature models have been widely adopted to reuse the requirements of a set of similar products in a domain. In feature models＇ construction, one basic task is to ensure the consistency of feature models, which often involves detecting and fixing of inconsistencies in feature models. While many approaches have been proposed, most of them focus on detecting inconsistencies rather than fixing inconsistencies. In this paper, we propose a novel dynamic-priority based approach to interactively fixing inconsistencies in feature models, and report an implementation of a system that not only automatically recommends a solution to fixing inconsistencies but also supports domain analysts to gradually reach the desirable solution by dynamically adjusting priorities of constraints. The key technical contribution is, as far as we are aware, the first application of the constraint hierarchy theory to feature modeling, where the degree of domain analysts＇ confidence on constraints is expressed by using priority and inconsistencies are resolved by deleting one or more lower-priority constraints. Two case studies demonstrate the usability and scalability （efficiency） of our new approach.

An improved test rig providing both the heat and cold source was used to perform thermal response test （TRT）, and the line source model was used for data analysis. The principle of determining the temperature difference between the inlet and outlet of test well can keep the heating or cooling rate constant, along with a reduced size of test rig. Among the influencial factors of the line source model, the temperature difference was determined as the most important, which agreed with the test results. When the gravel was taken as the backfill material, the soil thermal conductivities of heating and cooling at the test place were 1.883 W/（m＆#183;K） and 1.754 W/（m＆#183;K）, respectively, and the deviation of TRT between heating and cooling soil was 6.8%. In the case of fine sand, the thermal conductivities of heating and cooling were 1.541 W/（m＆#183;K） and 1.486 W/（m＆#183;K）, respectively, and the corresponding deviation was 6%. It was also concluded that different velocities of water had less influence on TRT than the temperature difference.

Prior knowledge of the correlations among commercially important traits in Glyptocidaris crenularis can be used to guide development of breeding and aquaculture programs for this species. We evaluated the phenotypic correlations between somatic and gonadal traits in G. crenularis during two sample periods (October 2010 and April 2011). The coefficients of variation (CV%) for body weight (BW), redness (a*), yellowness (b*), gonad wet weight (GW), and gonad index (GI) were >20% in both periods, while those of other traits were very low. GW was significantly correlated with somatic traits (diameter, height, and body weight) in both periods, although the correlation coefficients ranged from 0.473 to 0.636 (P <0.01). Gonad moisture content (GC), a*, and lightness (L*) were not significantly correlated with somatic traits (P >0.05). The color trait b* was negatively correlated with somatic traits (test diameter, test height, and body weight) during the period when the gonads were well developed (April 2011, P <0.05). We observed little difference in the nature of the phenotypic correlations between the two sample periods. The high variation in the somatic and gonad weight traits in G. crenularis suggests there is considerable potential for selective breeding. However, our results suggest that gonad quality traits cannot be selected indirectly by selecting for body weight. Our study provides an insight into the method for improving the breeding and aquaculture of G. crenulari.

A wideband dual-feedback low noise amplifier （LNA） was analyzed, designed and implemented using SiGe heterojunction bipolar transistor （HBT） technology. The design analysis in terms of gain, input and output matching, noise and poles for the amplifier was presented in detail. The area of the complete chip die, including bonding pads and seal ring, was 655 μm × 495 μm. The on-wafer measurements on the fabricated wideband LNA sample demonstrated good performance： a small-signal power gain of 33 dB with 3-dB bandwidth at 3.3 GHz was achieved; the input and output return losses were better than - 10 dB from 100 MHz to 4 GHz and to 6 GHz, respectively; the noise figure was lower than 4.25 dB from 100 MHz to 6 GHz; with a 5 V supply, the values of OPtdB and OIP3 were 1.7 dBm and 11 dBm at 3-dB bandwidth, respectively.