山东省民俗旅游资源开发研究

山东作为齐鲁故地,礼仪之邦,蕴藏着丰富的民俗旅游资源,具有开展民俗旅游的优越条件,论文以民俗及民俗旅游的理论研究为基础,综合分析山东民俗旅游的特点、类型和山东民俗旅游开发现状,就目前出现的问题,提出一些有针对性的开发原则和解决对策.     

GPGPU Cloud: A Paradigm for General Purpose Computing

The Kepler General Purpose GPU (GPGPU) architecture was developed to directly support GPU virtualization and make GPGPU cloud computing more broadly applicable by providing general purpose computing capability in the form of on-demand virtual resources. This paper describes a baseline GPGPU cloud system built on Kepler GPUs, for the purpose of exploring hardware potential while improving task performance. This paper elaborates a general scheme which defines the whole cloud system into a cloud layer, a server layer, and a GPGPU layer. This paper also illustrates the hardware features, task features, scheduling mechanism, and execution mechanism of each layer. Thus, this paper provides a better understanding of general-purpose computing on a GPGPU cloud.     

Temperature enhancement induced by ionosphere heating in low altitude region

The assumption that the electron temperature is approximately equal to the ion temperature is not rational during the high frequency （HF） heating in low ionosphere region. Thus, using the theoretical formula of incoherent scatter spectra with collisional plasma, the incoherent scatter data are analyzed during ionosphere heating at 91.7 km height on August 15th 2006. The enhancements of electron temperature are obtained, and the incremental percent is up to 37% and 46% at the universal time of 10：22 and 10：30, respectively. By using the same initialization value, the ionosphere heating process is simulated by Ohmic theory and the experimental results are basically consistent with the simulation.     

Electron acceleration from contracting magnetic islands during reconnection

A long-standing problem in the study of space and astrophysical plasmas is to explain the production of energetic electrons as magnetic fields 'reconnect' and release energy. In the Earth's magnetosphere, electron energies reach hundreds of thousands of electron volts (refs 1-3), whereas the typical electron energies associated with large-scale reconnection-driven flows are just a few electron volts. Recent observations further suggest that these energetic particles are produced in the region where the magnetic field reconnects. In solar flares, upwards of 50 per cent of the energy released can appear as energetic electrons. Here we show that electrons gain kinetic energy by reflecting from the ends of the contracting 'magnetic islands' that form as reconnection proceeds. The mechanism is analogous to the increase of energy of a ball reflecting between two converging walls--the ball gains energy with each bounce. The repetitive interaction of electrons with many islands allows large numbers to be efficiently accelerated to high energy. The back pressure of the energetic electrons throttles reconnection so that the electron energy gain is a large fraction of the released magnetic energy. The resultant energy spectra of electrons take the form of power laws with spectral indices that match the magnetospheric observations.     

航空发动机涡轮叶片振动模态影响因素研究

分别考虑离心力场、气动力场、温度场及热力场等因素的影响,使用有限元分析软件ANSYS,对某型航空发动机涡轮叶片工作状态下的振动模态进行分析,并将不同情况下的计算结果与室温静止状态进行比较,发现温度场及离心力场是影响叶片固有振动频率的主要因素,但对叶片的振型影响很小。然后,综合考虑温度场及离心力场的作用,对叶片进行了包含预应力的热固耦合模态分析,得到了叶片工作状态下的固有振动频率及振型。所得结论对航空发动机叶片的设计、改型及使用具有重要的理论意义和工程应用价值。     

常微分方程教学中一种变换与应用

本文通过常微分方程教学所引进的一种变换，结出了采用这种变换来求常系数非齐线性方程与非齐欧拉方程的特解，以及对求积分的应用．     

振荡管内非定常流动的数值模拟

建立了振荡管内非定常流动与传热的数学模型 ,分别采用Godunov格式和控制容积法对气动方程及传热方程进行离散 ,得到了管内压力波形、气流速度及温度随时间的变化历程 .所得管内压力波在波形和相位上与实验结果吻合较好 ;排气初期的气流速度最大且温度最低 ;管内出现强反射激波 .提出的求解Riemann问题迭代初值可使迭代快速、稳定收敛     

基于虚拟样机技术的汽车操纵稳定性参数正交优化设计

以某型轿车底盘为研究对象,采用虚拟样机软件ADAMS建立整车多体动力学仿真模型;结合汽车操纵稳定性的客观定量评价标准,建立了直接生成操纵稳定性评价值的ADAMS函数;用ADAMS软件结合正交试验方法对整车操纵稳定性进行了虚拟正交优化设计。虚拟样机技术在车辆操纵稳定性参数正交优化中的应用,不仅使仿真模型与集中质量模型相比提高了精度,还分析出整车操纵稳定性的主要零部件影响因素,得到了最优的一组设计方案。由于是直接对具体零部件的优化,整个设计过程适于在企业中应用。     

High-density fiber optic array technology and its applica- tions in functional genomic studies

The development of DNA microarray technology[1]revolutionized our way of studying gene expression.Instead of examining gene expression by Northern blots or RT-PCR one by one, we can now routinely check thechanges of hundreds and thousands of gene expressionlevels simultaneously. Hybridization of cellular cDNAs or cRNAs to tiny chips loaded with oligos or cDNA corre-sponding to the mRNA sequences allows us to have aglobal view of cellular responses instead of a keyholeview. For example …     

锶胁迫条件下生菜光谱效应特征

锶（Sr）胁迫条件下生菜的反射光谱特征会发生明显改变。通过室内生菜水培试验，获取了36个不同生长期、6个不同锶浓度胁迫的生菜叶片400～950 nm波段区间的生化参数信息（叶绿素含量、细胞结构、叶片金属含量）和反射光谱信息，利用光谱技术并结合数学统计方法研究了生菜叶片7个光谱特征参数与实测叶片锶元素含量之间的相关性，优选了较敏感光谱特征参数，建立了其与生菜叶片锶含量的线性回归模型。结果表明，锶胁迫生菜叶片叶绿素含量呈先上升后下降的规律，细胞结构差异不明显。锶胁迫生菜叶片反射光谱直观上无规律，通过采用光谱技术方法分析得出锶胁迫生菜叶片的红边波段位置先“红移”再“蓝移”，红谷波段位置则“红移”，植被指数B4/B3比值先升高后降低，红边归一化植被指数（NDVI）值随着锶浓度的升高而降低。相关性及线性回归模型分析表明红边波段位置与叶片锶含量显著相关。本文为下一步基于光谱特征的叶片重金属含量反演模型的构建提供了较好的数据源和基础理论。