二次型时频分析技术的开发与应用

基于二次型的时频分析是高分辨率时频分析技术的有效方法之一，该项技术能够有效反映时变信号的频谱特性，具有分辨率高、能量集中和跟踪瞬时频率的特点。从时变信号的特点出发，阐述了二次型时频分析技术的基本方法原理，采用正演模型分析验证了该方法的有效性，并在实际地震资料中应用于识别物源方向、划分沉积相带、预测储层结构以及相对厚度等诸多方面，均取得了较好的效果。     

基于熵权的料场方案模糊多属性优选研究

砂石料场方案选择中存在着许多难以精确度量的模糊性因素，常规的平衡法、系统分析法很难对此进行有效的处理。将模糊数学理论应用于砂石料场的方案选择，提出了熵权与模糊理论相结合的砂石料场方案优选方法，重点对标准化属性矩阵的产生、主客观权重结合得到综合权重及相对接近度的计算等几个方面进行了说明，并通过实例验证了该方法的可行性与实用性。     

An analytical expression for the power coefficient of an ideal horizontal-axis wind turbine

The paper shows that an analytical evaluation of the power coefficient C_p for an ideal horizontal-axis wind turbine can be made via an expression giving the direct relationship of C_p and the axial induction factor a. The results obtained agree closely with those obtained numerically from the usual integral expression involving several variables.     

Prediction of foam growth and its nucleation in free and limited expansion

The influence volume approach (IVA) is often utilized for modeling the mass transfer process dictating bubble growth dynamics in physical foaming. However, the assumed concentration profile in the IVA method is only valid when the changes in dissolved gas concentration are small (less than 5%). In addition, the validity of the IVA method is difficult to justify in chemical foaming applications because of the difficulties involved in defining the dissolved gas concentration profile.In the present work, we define two distinct stages of bubble growth for physical foaming. These two stages are termed as free and limited expansion and are controlled by the bubble nucleation rate. Bubble nucleation is assumed to occur only in the free expansion stage. In this stage, the bubble pressure drops substantially from an initially high pressure in the supersaturated state while the dissolved gas concentration changes very little. The second stage of our two-stage mass transfer model is termed the limited expansion stage and accounts for bubble growth in the late stages of foam evolution, when the pressure changes become small. However, in the limited stage of bubble growth the dissolved gas concentration drops significantly, as the available dissolved gas is depleted. To summarize our two-stage mass transfer model of foam expansion, the pressure difference between the bubble phase and the liquid phase is the primary mechanism for driving mass transfer in the early (free) stages of foam growth and the concentration difference is the driver for bubble growth in the late (limited) stages of growth. The first stage can be regarded as the nucleation stage and it is relatively short; while the second stage can be regarded as the bubble growth stage and is much longer. Most of the bubble volume expansion takes place in the second stage.The concentration gradient at the bubble edge, which is often ignored in other models, is analyzed in detail in this paper. The details of our novel mass transfer model are also presented.     

水轮发电机转子动平衡的时-频方法

提出了一种基于时域分析和频域分析的动平衡方法，应用于水轮发电机转子的动平衡。在这种时-频动平衡方法中，用时域分析来确定不平衡力的相位，用频域分析来确定不平衡力的大小。该方法具有平衡精度高、起机次数少的优点。用1台300MW水轮发电机转子的现场试验数据验证了该方法的准确性和适用性。     

A COMPUTER-AIDED UNIFIED APPROACH TO MODELING PWM AND RESONANT CONVERTERS

This letter puts forward a method of modeling for the steady-state and small signal dynamic analysis on PWM, quasi-resonant and series/（parallel） resonant switching converters based on pulse-waveform integral approach. As an example, PWM and quasi-resonant converters are used to discuss the principle of the approach. The results are compared with those in the relative literatures. Computer aided analysis are made to confirm the correctness.     

Complementary modelling of fluid separation processes

Optimal functioning of numerous technological processes depends primarily on relevant process design, properly selected column internals and sufficient understanding of the process behaviour. This can be achieved only with the help of accurate and reliable process models capable of considering process rates in a rigorous way, with respect to both transport phenomena and chemistry. In this article, a new modelling concept called complementary modelling is suggested for a large class of fluid separation processes. Since the conditions and criteria for these processes vary considerably, it is impossible to develop a unified modelling approach. Instead, a reasonable and effective combination of different modelling approaches provides solutions to many present and future tasks. The complementary modelling is discussed in detail and illustrated with several case studies.     

提高自主创新能力，加速变频器制造业持续快速发展

创新是企业发展不竭的动力，是增强企业竞争力的关键因素。本文就变频器企业在当前激烈的市场矗虿中，如何做好自主创新工作进行了探讨。在简要阐述自主创新的重要意义后，分析了变频器企业目前发展的现状和存在的问题。针对问题提出了变频器企业在开展自主创新时，可供参考的一些基本思路和途径。     

高性能磁性液体材料研究进展

解决纳米磁性粒子的耐氧化问题对制备高性能磁性液体具有重要意义。系统介绍了金属磁性液体和氮化铁磁性液体的制备方法，并对各种制备方法进行了评述。综述了磁性液体的耐氧化研究进展，主要是纳米金属粒子的无机物包覆和氮化铁磁性液体的抗氧化剂添加；展望了高性能磁性液体在耐氧化方面的研究趋势。     

Mind, brain, and self in psychoanalysis: Therapeutic implications of the mind-body relation.

Theoretical and empirical findings regarding the mind-body relation and its integration within a concept of the self-as-person lead to certain therapeutic implications and applications. The mind-set of the analyst or psychotherapist regarding the integration of mind-body can have important reverberations, which can dictate decisions for therapeutic intervention and management. Implications for conceptualizing technical modifications in analytic therapy are suggested. Conceptualization of mind and brain operating as an integrated and functional unity contribute to better understanding aspects of mental functioning that remain beyond the reach of conscious awareness and direct therapeutic processing. Particular attention is paid to the issue of combining medications clinically with psychotherapy and psychoanalysis. Future integration of psychoanalysis with advancing trends in therapeutic intervention and with rapidly expanding neurobiological understanding of mental actions as related to brain activity may require a deepening awareness of complexities of the mind-body relation and a more analytically meaningful resolution of the problem. (PsycINFO Database Record (c) 2010 APA, all rights reserved)