Blind equalization and sequence estimation using Markov chain Monte Carlo methods

This paper discusses the problem of restoring a digital input signal that has been degraded by an unknown FIR filter in noise, using the Gibbs sampler. A method for drawing a random sample of a sequence of bits is presented; this is shown to have faster convergence than a scheme by Chen and Li, which draws bits independently. ©1998 IEEE.

Genetic diversity and population history of the red panda (Ailurus fulgens) as inferred from mitochondrial DNA sequence variations

The red panda (Ailurus fulgens) is one of the flagship species in worldwide conservation and is of special interest in evolutionary studies due to its taxonomic uniqueness. We sequenced a 236-bp fragment of the mitochondrial D-loop region in a sample of 5

Mitochondrial DNA hypervariable region-1 sequence variation and phylogeny of the concolor gibbons, Nomascus

The still little known concolor gibbons are represented by 14 taxa (five species, nine subspecies) distributed parapatrically in China, Myanmar, Vietnam, Laos and Cambodia. To set the stage for a phylogeographic study of the genus we examined DNA sequence

Molecular Cloning and Sequence Analysis of Two cDNAs Encoding Metalloproteinase2disintegrin from Trimeresurus jerdonii

　从菜花烙铁头蛇的毒腺中,利用RT2PCR 进行体外扩增,克隆到2 个金属蛋白酶2去整合素基 因,命名为TJM21、TJM22. TJM21 cDNA 全长为1 528 bp ,编码481 个氨基酸;TJM22 cDNA 全长为1 578 bp ,编码484 个氨基酸. TJM21 和TJM22 都属于Ⅱ型蛇毒金属蛋白酶,由信号肽、前肽、金属蛋白酶、 间隔肽和去整合素5 部分组成. Ⅱ型蛇毒金属蛋白酶氨基酸序列的比较及进化分析显示,它可进一 步分为两类,一类包括大多数Ⅱ型蛇毒金属蛋白酶(其中含有TJM21) ,而TJM22 和agkistin 则组成了 另一类. 并且TJM22 和agkistin 的第407 位和第426 位残基都是半胱氨酸,而在其它Ⅱ型金属蛋白酶 的相应位置,407 位是丝氨酸,426 位则缺失. TJM22 和agkistin 均有可与整合素α2 Ⅰ区域特异性结合 的片段QPNRKRHDNAQ(残基276～284) ,这个片段在其它Ⅱ型金属蛋白酶中并没有发现. 因此推 断, TJM22 和agkistin 可能属于一类新型的Ⅱ型蛇毒金属蛋白酶.

Simulation of solitary wave impact on coastal structures using weakly compressible and incompressible SPH methods

In this paper, we engage a Lagrangian, particle-based CFD method, named Smoothed Particle Hydrodynamic (SPH) to study the solitary wave motion and its impact on coastal structures. Two-dimensional weakly compressible and incompressible SPH models were applied to simulate wave impacting on seawall and schematic coastal house. The results confirmed the accuracy of both models for predicting the wave surface profiles. The incompressible SPH model performed better in predicting the pressure field and impact loadings on coastal structures than the weakly compressible SPH model. The results are in qualitatively agreement with experimental results. Copyright © 2011 by the International Society of Offshore and Polar Engineers (ISOPE).

Energy scattering in weakly non-linear systems.

The Chinese Tam-Tam exhibits non-linear behavior in its vibro-acoustic response. The frequency content of the response during free, unforced vibration smoothly changes, with energy being progressively smeared out over a greater bandwidth with time. This is used as a motivating case for the general study of the phenomenon of energy cascading through weak nonlinearity. Numerical models based upon the Fermi-Pasta-Ulam system of non-linearly coupled oscillators, modified with the addition of damping, have been developed. These were used to study the response of ensembles of systems with randomized natural frequencies. Results from simulations will be presented here. For un-damped systems, individual ensemble members exhibit cyclical energy exchange between linear modes, but the ensemble average displays a steady state. For the ensemble response of damped systems, lightly damped modes can exhibit an effective damping which is higher than predicated by linear theory. The presence of a non-linearity provides a path for energy flow to other modes, increasing the apparent damping spectrum at some frequencies and reducing it at others. The target of this work is a model revealing the governing parameters of a generic system of this type and leading to predictions of the ensemble response.