Iterative shaping reconstruction algorithm based on the modulus maxima of signals' dyadic wavelet transform

An iterative shaping reconstruction algorithm based on modulus maxima of signals' dyadic wavelet transform is proposed. Numerical experiments show that the algorithm is of good convergence and smaller reconstruction error. Compared with Mallat's alternating projection algorithm, this algorithm is simpler and faster.     

Analysis on sustainable growth range of population

Based on the summarization and the analysis of the obtained research results, the models for local stability and for global stability of ecosystems are developed by means of the theory of dissipative structures, with which the questions on sustainable growth range of population are answered.     

Late Mesozoic interaction between crust and mantle in coastal area of Zhejiang-Fujian

This paper summarizes the lithogeochemical features of composite lavas, dikes and plutons composed of early Cretaceous associated basic-acidic igneous rocks from the coastal area of Zhejiang-Fujian. On the basis of the studies on Nd, Sr, Pb isotopic signatures and geochemical characteristics of large ion lithophile elements (L1LE) , light rare earth elements (LREE) and high field strong elements ( HFSE) of these contemporary basic-acidic igneous rocks, it is considered that the source enrichment caused by the subduction of Pacific plate and contamination of crustal rocks and melts during ascending process may lead to the formation of basaltic magmas with a high LILE concentration. These late Mesozoic composite basic-acidic igneous rocks are the products of the interactions between crust and mantle in active continental margin.     

Nonlinear dynamics of controlled mechanical systems

Unavoidable time delays in the feedback path of a controlled mechanical system may render the sys- tem unstable, and block the development and the application of dynamic control. This paper summarizes the recent work of the authors on the dynamics of controlled mechanical system with time delays. It starts with the dimensional reduction of delayed nonlinear systems composed of stiff and soft substructures and then presents the experimental modeling of lin¬ear and nonlinear mechanical systems with the time delays in state feedback taken into account. In the frame of linear controlled systems, this paper outlines the analysis of delay-independent stability and stability switches with the increase of time delay, the stability analysis in the case of short time delay, and the robust stability analysis of the system pos¬sessing uncertain parameters. Afterwards, the paper briefly discusses the primary resonance and subharmonic resonance, as well as the corresponding stability analysis, of a kind of harmonically forced Duffing oscillators with time delay, and the stabilization of periodic motion of nonlinear delayed systems. Finally, the applications of the stability analysis ap¬proaches to structure controls and active chassis of ground vehicles are outlined.     

Drug release from a coated planar matrix with a super-saturation loading in the core I

A comprehensive model is proposed to accurately describe the kinetics of drug release from a coated matrix when drug loading in the core is above its saturation level. The general solutions are obtained in dimensionless form by Laplace transform, from which special cases have been derived and the results have been discussed in different variables. According to the derived equations, the concentration profiles in the core and coating were computed and il¬lustrated for various diffusivity ratios and thickness ratios.     

Erosion and sediment delivery in rills on steep loess slope

Sediment delivery in rills on the loess slope was studied by inflow experiments. Relationships between sediment delivery rate in rills and flow shear stress, discharge and slope gradient, maximum sediment and unit runoff power, and discharge and slope gradient were analyzed. A relationship is presented for calculating the erosion rate in rills .     

Roles of computational auditory model in automatic speech recognition

The development of computational auditory modeling in the last 30 vears is reviewed, and its development in the com trig years is predicted .     

Coral Sr thermometer simplified from Sr/Ca thermometer

Cubic sub-samples obtained from a Porites coral slice collected from Xisha Islands, South China Sea, were weighed with precise micro-balance. The Sr and Ca concentrations were analyzed with isotope dilution thermal ionization mass spectrometry. Our results demonstrate that Ca concentrations in all samples are very uniform ( mean = 9.52mmol/g, la = 0.02mmol/g) ; Sr concentrations and Sr/Ca ratios are well correlated (correlation coefficient r = 0.9968) . It implies that the Sr thermometer can replace Sr/Ca thermometer and the determination of Ca can be omitted. This can save up to 50% time and cost, and more importantly, paleoclimate study using coral proxy can now be carried out in routine Sr isotope laboratories.     

C.I.分散红60及其同系列染料在不同pH染浴中的染色性能

在不同ｐＨ染浴中测试了Ｃ．Ｉ．分散红６０及其相关品种（Ｃ。Ｉ。分散红１２７、１４６及１９１）对涤纶织物的染色性能。结果表明,染浴ｐＨ不影响Ｃ．Ｉ．分散红６０、１９１对涤纶织物染色的提升力。中性、碱性染浴下Ｃ。Ｉ。分散红１４６对涤纶织物的染色性能优于酸性染浴。Ｃ．Ｉ．分散红１２７在碱性染浴下对涤纶织物染色的提升力小于中性染浴,在酸性条件下能获得最佳提升力。染浴ｐＨ对上述染料的而晒、耐升华牢度没有影响     

一种适用无线视频通讯低复杂度H.264 VBSME VLSI结构

针对无线视频通讯H.264编码器关键技术VBSME VLSI实现,提出了一种低复杂度结构,该结构由宏块输入缓存器,17×16 蛇形扫描寄存器阵列, 8×8 PE阵列,4×4 SAD加法树和四步可变块运动矢量生成器组成。在有效保持所有的H.264宏块特性的基础上,相对于宏块级的VBSME结构,通过采用新提出的四步可变块运动矢量生成器和双时钟频率调谐技术,主要的数据通道宽度缩减到25%, 硬件代价缩减到37％,关键路径延时由9.8?ns减少到8.2?ns,功耗约降低了50.3％。