如何有效培养和提高高级语言程序设计学习兴趣

针对大学本科高级语言程序设计教学中对学生学习兴趣的培养不够重视的实际状况,文章在分析学习兴趣对教学重要性的基础上,就如何培养和提高学生的学习兴趣进行了深入的研究;结合笔者在计算机本科教学改革中所作的尝试,着重从融洽师生感情、认识课程重要性、精心选择例题、多模式教学、丰富学习交流互动渠道和改进实验体系6个方面给出了合理有效的方法,有效地培养和提高学生的学习兴趣,在很大程度上提高了整体教学效果。     

应用ANTLR实现过程式语言操作语义的动态演示

介绍了一个面向过程语言的文法特点,应用ANTLR实现了该语言操作语义的动态演示,系统可辅助教师进行课堂教学,为学生自主学习提供良好的支撑环境,从而用形象的图形界面为学生搭起通向掌握抽象思维方法的桥梁。     

Information diffusion-based spatio-temporal risk analysis of grassland fire disaster in northern China

This study presents a Geographical Information Systems (GIS) and information diffusion-based methodology for spatio-temporal risk analysis of grassland fire disaster to livestock production in the grassland area of the northern China. We employed information matrix to analyze and to quantify fuzzy relationship between the number of annual severe grassland fire disasters and annual burned area. We also evaluated the consequences of grassland fire disaster between 1991 and 2006 based on historical data from 12 northern China provinces. The results show that the probabilities of annual grassland fire disasters and annual damage rates on different levels increase gradually from southwest to northeast across the northern China. The annual burned area can be predicted effectively using the number of annual severe grassland fire disasters. The result shows reliability as tested by two-tailed Pearson correlation coefficient. This study contributes a reference in decision making for prevention of grassland fire disaster and for stockbreeding sustainable development planning. The fuzzy relationship could provide information to make compensation plan for the disaster affected area.     

The estimation of probability distribution of SDE by only one sample trajectory

This paper focuses on the method of the simulation of a stochastic system and the main method of our paper is the Monte Carlo computation simulation method. Taking the stochastic Logistic equation as an example, we present the simulation of the sample trajectory by Euler scheme and the invariant probability distribution of stochastic differential equations with the Monte Carlo method. We also compare the simulation result with the analytical result for the autonomous stochastic Logistic model. Moreover, the stochastic Logistic equation with Markovian switching which is described by a Markov chain taking values in a finite state space is considered.     

Soft polygroups

Soft set theory, introduced by Molodtsov, has been considered as an effective mathematical tool for modeling uncertainties. In this paper, we initiate the study of algebraic hyperstructures of soft sets. The concepts of soft polygroups, normal soft polygroups, soft subpolygroups and normal soft subpolygroups are introduced, and some related properties are investigated. Furthermore, we propose the homomorphism and isomorphism of soft polygroups, and establish three isomorphism theorems for soft polygroups.     

Bayesian analysis of the patterns of biological susceptibility via reversible jump MCMC sampling

In some biological experiments, it is quite common that laboratory subjects differ in their patterns of susceptibility to a treatment. Finite mixture models are useful in those situations. In this paper we model the number of components and the component parameters jointly, and base inference about these quantities on their posterior probabilities, making use of the reversible jump Markov chain Monte Carlo methods. In particular, we apply the methodology to the analysis of univariate normal mixtures with multidimensional parameters, using a hierarchical prior model that allows weak priors while avoiding improper priors in the mixture context. The practical significance of the proposed method is illustrated with a dose-response data set.     

南水北调水市场机制实验研究的启示

南水北调工程水资源管理制度决定着调水工程的成败,基于国情和水情,水资源配置的准市场机制是其必要的制度选择.在南水北调工程水市场机制实验研究的基础上,通过对实验过程的观察、实验结果的分析,得到及时发布市场信息、建立协商机制、完善水权流转制度等南水北调水资源配置的几点启示.     

Hydrological Evolution of Wetland in Naoli River Basin and its Driving Mechanism

Naoli river basin(NRB), with an area of 24,863 km², is the largest basin and also the largest marsh distribution area in Sanjiang Plain, Heilongjiang, China. The hydrological evolution process of wetland in NRB has made a marked ecological responses for anthropic activities, also reflects the drying trend of the Sanjiang Plain, Northeast China. Global climate warming also contributes to the hydrological evolution process. The following key research results are obtained: (1) The monthly average water level of Naoli river at Caizuizi hydrological station in different ages showed a marked decline tendency, the annual mean water level dropped from 96.63 m during 1960–1969 to 95.59 m during 2000–2005, the water level drawdown is 1.04 m; (2) The annual runoff flowing into wetlands in NRB decreased. Duration of Naoli river and its tributaries being thoroughly frozen from riverbed to river-water-surface showed an prolonged trend, and the water level drawdown in frozen seasons increased. The water storage capacities of wetlands in NRB declined. (3) The interactions between ground water and surface water in wetland areas are close. The ground water level variation span is bigger than that of surface water level in wetland areas of NRB. The drawdown of ground water level promotes the surface water level to decline, correspondingly. In recent 20 years, the cultivated area extension of rice field in upstream NRB has made an adverse influence on the hydrological processes of wetlands. (4) The wetland area decrease and farmland area increase significantly contribute to the runoff depth decrease of wetlands in NRB. The runoff depth variability has been mostly posed by anthropic activities. (5) Reservoirs, ditches and dykes in NRB have greatly changed the runoff generation processes. Thickness of the seasonal frozen soil layer becoming thinner and the evaporation potential becoming bigger also contribute to the runoff depth reduction and the water level drawdown of rivers. The present study results will provide a scientific basic for developing an integrated watershed management program for NRB, especially, restoring the wetland hydrological processes, maintaining or improving the wetland structure and enhancing the wetland service functions.     

(Ba_(0.94)La_(0.06))Ti_(0.985)O_3陶瓷的低温相变点的确定

为了对国产X射线衍射仪(XRD)进行低于室温的温度校正,采用冷压陶瓷技术制备了(Ba1-xLax)Ti1-x/4O3(x=0.06)(BL6T)陶瓷样品.BL6T陶瓷的铁电相变点(TC)由升温的介电温谱和降温的拉曼光谱技术确定.结果表明:BL6T具有一级相变特征,符合变温XRD校正要求.但BL6T显示热弛豫效应,采用两种技术确定的相变点分别发生在-3和-6℃,两者显示较小的热弛豫(3℃).