Characterizing the dynamics of auditory perception

After listening to a sound that is presented repeatedly, subjects report hearing different transforms of the original sound. The frequency of reported transforms is a sensitive index of some speech disorders as well as cognitive flexibility in aging. In this paper, we propose and investigate quantitative measures that characterize the dynamics of this phenomenon, known as the verbal transformation effect. In particular, we show that the distribution of the dwell time, the time spent perceiving a string of a given phonemic form before switching to another form, obeys a power law for normal subjects with an exponent valued between 1 and 2. This result suggests that within this paradigm there is no characteristic time scale for the perceptual process. Additionally, we analyze the correlation properties of the transforms. We suggest that the complexity measures and techniques introduced here might be useful diagnostic tools for a number of speech and cognitive disorders. (c) 1995 American Institute of Physics.     

The projection method for computing multidimensional absolutely continuous invariant measures

We present an algorithm for numerically computing an absolutely continuous invariant measure associated with a piecewiseC ² expanding mappingS: on a bounded region R ^N. The method is based on the Galerkin projection principle for solving an operator equation in a Banach space. With the help of the modern notion of functions of bounded variation in multidimension, we prove the convergence of the algorithm.     

Bernstein多项式导数的整体收敛速度

研究Ｂｅｒｎｓｔｅｉｎ多项式的导数对可导函数的整体逼近,利用Ｋ－泛函和光滑模的方法,建立了同时逼近的正定理和逆定理     

稀土肥料在日光温室栽培草莓上的应用研究

探讨了不同浓度的稀土肥料,分别用于日光温室栽培草莓（Ｆｒａｇａｒｉａａｎａｎａｓｓａ）的浸根及根外追肥,结果表明：定植时用２００－３００ｍｇ／ｋｇ浓度浸根;生长旺盛期、初花期、盛花期用３００－４００ｍｇ／ｋｇ浓度喷施,对草莓具有显著的增产效果。     

Chronology of environmental events over East Asia during the past 130 ka

In the transitional region between the Loess Plateau and deserts, 4 sections located respectively at Yuling, Hengshan, Dingbian and Huining of China are studied. The high-resolution paleoclimatic records obtained show that environmental events on varying time scales have happened over East Asia. These events are dated with the time scales established using the recently-developed approach of Automatic Orbital Tuning. This leads to the establishment of the chronology of the environmental events.