论“适度消费”的伦理维度

消费行为是道德因素与经济因素的统一，这是我们能够对消费行为进行伦理评价的基本依据。本文从个人消费者需要出发，以生态伦理的视角，着重探讨适度消费“度”的确定及其根据。本文认为：社会为消费者提供的“基本生活条件”与自然的可持续能力能够承受“最高消费量”共同构成了适度消费的“度”，这个“度”兼顾了消费者个人与社会、人类与自然的伦理关系。尤其在人类与自然的矛盾日益突显的现代，后一种伦理关系尤为珍贵，它所体现的理性生活态度，值得人类尊重和坚持。     

圆自由射流多尺度涡结构迁移特性的实验研究

在流场背景湍流度比较大或流场中涡结构的尺度范围比较宽的情况下，为了研究湍流场中不同尺度涡结构的迁移速度，用IFA300双通道恒温热线风速计和两个热线探针测量圆自由射流中心线上距离一定的空间两点同一时刻的流向速度分量，用子波分析提取了每一个探针输出的不同尺度的脉动速度信号，计算了两个探针输出的同一尺度脉动速度信号的互相关函数，利用互相关函数达到最大值对应的延迟时间研究了湍流多尺度涡结构的迁移特性。实验结果表明：不同尺度涡结构具有不同的迁移速度，小尺度涡的迁移速度较大，大尺度涡的迁移速度较小。其中，一部分尺度的涡结构是湍流中的主要结构，该尺度涡结构对湍流的贡献也是主要的，其迁移速度与实验测得的湍流平均速度较为接近。     

叉剪式液压平台车结构模态有限元分析

运用ANSYS软件对叉剪式液压平台车进行结构模态有限元分析,计算得出平台车的前5阶模态频率及相应的主振型,为设计和使用提供理论依据。     

方形膜片压力敏感元件的频率特性

方形膜片是一种先进的敏感压力的谐振子。其于板的大找度变形理论，建立了被测压力与谐振子固有频率的数学模型，计算机、分析了谐振子的几何参数对振动特性的影响规律，得到了在给定压力得程内，对确定材料的膜片其固有频率相对零压力频率的变化率只与其边长、膜片厚的比值有关的重要结论，为设计该类谐振子提供了理论依据。     

A 2-D comparison of ionospheric convection derived from SuperDARN and DMSP measurements

Ion drift vectors measured by the DMSP satellites are compared with plasma convection vectors obtained by the SuperDARN HF radars through the standard Map Potential algorithm of Ruohoniemi and Baker [Ruohoniemi, M., Baker, K.B. Large-scale imaging of high-latitude convection with super dual auroral radar network HF radar observations. J. Geophys. Res. 103, 20797–20811, 1998]. Despite significant data spread, the agreement can be qualified as reasonable for a data set comprising of 149 satellite passes over the Northern Hemisphere at high latitudes. The slope of the best-fit line relating SuperDARN and DMSP velocity magnitudes is of the order of 0.3 with a tendency for the SuperDARN velocities to be smaller. The agreement between the azimuths of the ion drift and convection is better with the slope of the best-fit line being close to 1. It is shown that consistency between the radar and satellite measurements is much better if the SuperDARN line-of-sight velocities are compared with the DMSP cross-track ion drifts for events showing slow spatial and temporal variations of the convection. If areas of strong convection changes are included into comparison, the degree of agreement deteriorates drastically. This result implies that differences in the spatial and temporal resolutions of DMSP and SuperDARN measurements are crucial factors contributing to the observed discrepancies. In addition, some differences are introduced when the SuperDARN line-of-sight velocities are filtered and reprocessed into vectors with the application of a background convection model.     

EXTENDED SELF SIMILARITY OF PASSIVE SCALAR IN RAYLEIGH-BENARD CONVECTION FLOW BASED ON WAVELET TRANSFORM

Wavelet transform is used to analyze the scaling rule convection flow from two aspects. By utilizing the method of extended self similarity (ESS), one can find the obtained scaling exponent agrees well with the one obtained from the temperature data in a experiment of wind tunnel. And then we propose a newly defined formula based on wavelet transform, and can determine the scaling exponent ξ(q) of temperature data. The obtained results demonstrate that we can correctly extract ξ(q) by using the method which is named as wavelet transform maximum modulus (WTMM).``     

磁尾等离子体片对流对亚暴的影响

采用2(1/2)维全粒子电磁模拟方法研究了等离子体片中稳态对流及局地爆发高速流对磁层亚暴触发过程的影响.研究发现,地向瞬时局地高速流可触发磁场重联,导致储存于磁尾磁场能量的快速释放.但是,等离子体片稳态对流可抑制磁尾磁场重联过程.此项研究结果表明,局地爆发高速流能够触发磁层亚暴;而行星际磁场(IMF)持续南向时的稳态磁层对流期间,不易发生亚暴.      

基于自相关函数的自然纹理图像分形维数的估计

提出了一种估计分形维数的新方法,并利用该方法估计自然纹理图像的分形维数.分形维数是描述图像粗糙程度的主要参数.将分数布朗运动推广到离散情况,研究离散高斯噪声的自相关函数的性质.根据自相关函数的性质,获得估计分形维数的自相关函数方法.合成分形图像和自然纹理图像被用来检验该方法的准确性,并与计盒方法进行了比较,结果显示自相关法是准确的和有效的.      

关于轴流压气机的非定常两代流型

针对作者提出的轴流压气机非定常两代流型——非定常自然流型(UNFT)和非定常耦合流型(UCFT)——概念,本文进行了数值模拟和试验两个方面的验证。从数值模拟结果来看,实现非定常耦合流型后,对应非定常流场的时空结构将由无序状态向有序状态转化,流场的时均性能也能得到较大提高。环形叶栅声激励和PIV测量的实验结果亦证实了这一结论。