俄罗斯巴扬琴作品研究——以迈克尔·巴里萨维奇·布朗纳创作为例

迈克尔·巴里萨维奇·布朗纳是俄罗斯一位非常著名的作曲家,他一生创作了100余部涉及歌剧、舞剧、室内乐等各个领域的不朽杰作,而与影像和情节相关的作品在作曲家的创作中占据重要地位。这位作曲家与弗里德李赫·利普斯在音乐会上的相识将他对巴扬琴音乐的创作推向了顶峰。

在实践中界定民俗的“实践民俗理论”——西蒙·布朗纳教授访谈录

张举文:首先,感谢您在今夏为北京师范大学所做的一系列讲座,特别是昨天的精彩学术报告,吸引了近四千人观看。其次,也感谢您接受这次访谈,让更多的中国同行有机会了解您,包括您现在作为一位民俗学家的理论观点,以及您作为一位有着典型移民经历的美国人如何成为民俗学家的历程。因为我们将有其他文章从学术角度与您所谈的实际理论进行对话,所以我想我们现在可以像聊家常一样聊聊您的个人成长,有关实践理论在美国的学术情况,以及您与实践理论的关系。

Boundary layer flow of third grade nanofluid with Newtonian heating and viscous dissipation

Two-dimensional boundary layer flow of an incompressible third grade nanofluid over a stretching surface is investigated.Influence of thermophoresis and Brownian motion is considered in the presence of Newtonian heating and viscous dissipation.Governing nonlinear problems of velocity, temperature and nanoparticle concentration are solved via homotopic procedure.Convergence is examined graphically and numerically. Results of temperature and nanoparticle concentration are plotted and discussed for various values of material parameters, Prandtl number, Lewis number, Newtonian heating parameter, Eckert number and thermophoresis and Brownian motion parameters. Numerical computations are performed. The results show that the change in temperature and nanoparticle concentration distribution functions is similar when we use higher values of material parameters β1 andβ2. It is seen that the temperature and thermal boundary layer thickness are increasing functions of Newtonian heating parameter γ.An increase in thermophoresis and Brownian motion parameters tends to an enhancement in the temperature.

Wigner Function for Klein-Gordon Landau Problem

First we calculate the Wigner phase-space distribution function for the Klein-Gordan Landau problem ona commmutative space.Then we study the modifications introduced by the coordinate-coordinate noncommuting andmomentum-momentum noncommuting, namely, by using a generalized Bopp’s shift method we construct the Wignerfunction for the Klein-Gordan Landau problem both on a noncommutative space (NCS) and a noncommutative phasespace (NCPS).

The Impact of Rural Women＇s Land Rights on Food Production in the Brong-Ahafo Region of Ghana

The poor performance of the agricultural sector as reflected in high prices of food stuffs as well as huge importation of food has been a major concern to many governments in Africa. Agriculture remains the backbone of Ghana＇s economy and women who constitute about 70% to 80% of farm labour face discrimination in terms of means of production such as land. The purpose of this study is to assess the impact of women＇s land rights on food production in the Brong-Ahafo region which is Ghana＇s food basket. Several land reforms have been instituted to ensure equitable access to land in order to enhance food production, yet the study reveals that many women have limited or no access to land and experience insecurity of tenure, which affects their farming methods, choice of crops grown, and production levels, consequently, resulting in low incomes and poverty. Relevant Primary Rate Access （RPRA） tools were used to gather data. The data were analyzed through descriptive statistics using Statistic Package for Social Science （SPSS） and Microsoft soRwares and presented into percentages, tabulation, and graphics. The research also revealed that the lack of awareness and education on land reforms and policies coupled with escalating land prices and complicated land transaction method are the major challenges to women＇s access and security over land. The study recommends the decentralization of the land title registration process, gender mainstreaming in the land title registration process, and intensification of advocacy on land rights, among others as crucial to improve women＇s access, control, and security over land for agricultural purposes

Asymmetrical free diffusion with orientation-dependence of molecules in finite timescales

Using molecular dynamics simulations, we show that free diffusion of a nanoscale particle (molecule) with asymmetric structure critically depends on the orientation in a finite timescale of picoseconds to nanoseconds. In a timescale of ~100 ps, there are ~10% more possibilities for the particle moving along the initial orientation than moving opposite to the orientation; and the diffusion distances of the particle reach ~1 nm. We find that the key to this observation is the orientation-dependence of the damping force to the moving of the nanoscale particle and a finite time is required to regulate the particle orientation. This finding extends the work of Einstein to nano-world beyond random Brownian motion, thus will have a critical role in the understanding of the nanoscale world.

A modified TEMOM model for Brownian coagulation of nanoparticles based on the asymptotic solution of the sectional method

The Taylor-series expansion method of moments(TEMOM)is modified to match the behavior of real self-preserved aerosols by taking advantage of the numerical results obtained by the sectional method for Brownian coagulation in both continuum and free molecular regimes.The newly proposed model is able to predict the evolution of the zeroth and second moments more accurately than the original TEMOM when the aerosol size distribution approaches self-preserving or the coagulation time is sufficiently long.A special kind of coordinate diagram,which describes the relationship between the moment equations and one non-dimensional moment is first used to investigate different methods of moments that only involve the first three moments.The errors produced by different methods of moments can be qualitatively explained by these diagrams.By polynomial fitting,a new set of moment equations for Brownian coagulation in the free molecular regime is proposed in the framework of the log-normal preserving theory.