A Parametric Dynamic Model of Dark Energy

The double complex symmetric gravitational theory is extended to the parametric symmetric gravitational theory by introducing a parameter β. Hence parametric Friedmann-Robertson-Walker equations are obtained and some characters of dark energy in corresponding spaces are discussed by taking different values of β. In our method some previous results can be included as the special case of our results. It is worth noting that some characters of dark energy can be more intuitively described in our model. By analysis, we can predict that the fate of universe would be a Big Rip in the future, and also find that the state parameters for the two different constraint conditions wФ are consistent with the present cosmological observations.     

Photoemission Spectroscopy and Electronic Structures of LiMn2O4

We study the electronic structures of LiMn2O4 by x-ray and ultraviolet photoelectron spectroscopy （XPS, UPS） and resonant photoelectron spectroscopy （RPES）. XPS data suggest that the average oxidation state of Mn ions is 3.55, probably due to the small amount of lithium oxides on the surface. UPS and RPES data imply that Mn ions are in a high spin state, and RPES results show strong Mn3d-O2p hybridization in the LiMn2O4 valence band.     

Information Entropy Squeezing for a Atom in Mode-Mode Competition System

The entropy squeezing properties for a two-level atom interacting with a two-mode field via two different competing transitions are investigated from a quantum information point of view. The influences of the initial state of the system and the relative coupling strength between the atom and the field on the atomic information entropy squeezing are discussed. Our results show that the squeezed direction and the frequency of the information entropy squeezing can be controlled by choosing the phase of the atom dipole and the relative competing strength of atom-field, respectively. We find that, under the same condition, no atomic variance squeezing is predicted from the HUR while optimal entropy squeezing is obtained from the EUR, so the quantum information entropy is a remarkable precision measure for the atomic squeezing in the considered system.     

免跟踪透射式太阳聚光器的设计

针对目前太阳聚光器中因为自动跟踪系统故障率高导致使用成本大幅度增加的主要制约因素,在多年来探讨有效提高太阳能密度的基础上,提出了免跟踪线性菲涅尔透射式太阳聚光器设计的新思路,并对其结构形式和工作原理进行了阐述.     

基于响应面模型的高超声速低温喷管优化

 建立了高超声速低温(HYLTE)喷管的响应面模型,样本点设计矩阵采用正交试验设计法构造,样本数据通过3维粘性NS方程计算喷管光腔耦合段的多组分混合流场获得。基于HYLTE喷管响应面模型,对喷管进行了多目标优化,定义了综合性能参数,优化后喷管混合性能显著改善,综合性能明显提高。计算表明,基于响应面模型的优化策略,能够满足喷管优化对计算精度和计算量的要求。运用多学科设计优化软件框架iSIGHT作为建模和优化的辅助工具,提高了优化设计的实现效率。     

ICF靶用微球弹跳的影响因素分析

 通过对微球弹跳模型的建立,对微球弹跳过程进行了受力分析,解释了微球弹跳过程中遇到的微球粘连或“不跳”、弹跳率起伏不定及弹跳幅度高低不同等现象。通过对加载信号方向与大小、微球质量及尺寸大小、微球及反弹盘表面特性、环境湿度等影响微球弹跳效果因素的分析,提出了改善涂层表面粗糙度和弹跳效果的措施,包括根据微球大小调整微球弹跳激励方式、等离子体中和微球表面电荷、反弹盘表面改性减小球盘之间的相互作用力。     

水热合成六方相NaYbF4∶Er3+/Tm3+的上转换白光性质

在反应温度为220℃,反应时间为48h的温和条件下,利用水热法合成单掺杂或共掺杂Tm3 、Er3 的六方相NaYbF4体系,利用X射线粉末衍射、紫外-可见-近红外漫反射吸收光谱以及荧光光谱等测试手段,分析体系的物相结构和荧光性能。在980nm红外激光的激发下,NaYbF4∶Er3 体系能发出强的绿光和红光,两者分别对应于Er3 离子的(2H11/2,4S3/2)→4I15/2、4F9/2→4I15/2能级跃迁;NaYbF4∶Tm3 体系能发出对应于Tm3 离子1D2→3F4和1G4→3H6能级跃迁的强蓝光;而NaYbF4∶Er3 /Tm3 体系能同时发出红蓝绿三种颜色的光;各发射的归属与单掺杂相同,但由于Er3 和Tm3 离子之间存在能量交叉弛豫,致使各发光强度发生变化。通过控制Er3 和Tm3 离子的浓度及其比例,可以调整NaYbF4∶Er3 /Tm3 体系的上转换蓝光、绿光和红光强度的比例,结果表明,在980nm红外激光的激发下,NaYbF4∶Er3 /Tm3 (0.4%/0.4%)能发出近似白光的上转换发射。因此,NaYbF4∶Er3 /Tm3 有望成为单一基质的上转换白光材料。     

基于可见-近红外光谱技术预测茶鲜叶全氮含量

为快速无损监测茶树氮素营养及其生长状况,基于可见-近红外光谱技术建立了茶鲜叶全氮含量的预测模型。以茶鲜叶为对象,田间试验使用便携式光谱仪采集叶片漫反射光谱信息,通过不同预处理和统计分析,建立茶鲜叶全氮含量预测的光谱模型。试验共采集111个样品,其中86个样品作校正集,25个样品作预测集。通过一阶导数与滑动平均滤波相结合的预处理方法,用7个主成分建立的偏最小二乘模型最好,其校正集均方根误差(RMSEC)为0.097 3,预测集的相关系数为0.888 1,预测均方根误差(RMSEP)为0.130 4,预测的平均相对误差为4.339%。研究结果表明,利用可见-近红外光谱技术可以很好地预测茶鲜叶全氮含量,对于快速实时监测茶树长势和施肥管理具有重要指导意义。     

Generalized Uncertainty Principle and Thermodynamic Quantities of SAdS5 Black Hole

Recently, there has been much attention devoted to resolving the quantum corrections to the Bekenstein- Hawking black hole entropy. The different correction leading terms are obtained by the different methods. In this paper, we calculate the correction to SAdS5 black hole thermodynamic quantity due to the generalized uncertainty principle. Furthermore we derive that the black hole entropy obeys Bekenstein Hawking area theorem. The entropy has infinite correction terms. And every term is finite and calculable. The corrected Cardy-Vedinde formula is derived. In our calculation, Bekenstein Hawking area theorem still holds after considering the generalized uncertainty principle. We have not introduced any hypothesis. The calculation is simple. Physics meaning is clear. We note that our results are quite general. It is not only valid for four-dimensional spacetime but also for higher-dimensional SAdS spacetime.     

Optical Properties of Co-BaTiO3/Mg（100） Nano-Composite Films Grown by Pulsed Laser Deposition Method

Co nanoparticles embedded in a BaTiO3 matrix, namely Co-BaTiO3 nano-composite films are grown on Mg（100） single crystal substrates by the pulsed laser deposition （PLD） method at 650℃. Optical properties of the CoBaTiO3 nano-composite films are examined by absorption spectra （AS） and photoluminescence （PL） spectra. The results indicate that the concentration of Co nano-particles strongly influences the electron transition of the Co BaTiO3 nano-composite films. The PL emission band ranging from 1.9 to 2.2eV is reported. The AS and PL spectra suggest that the band gap is in the range of 3.28-3.7eV.