具有多级孔的纯硅沸石材料的合成

采用表面活性剂组装沸石晶种的方法, 研究了不同浓度的非离子表面活性剂 P123 对组装的纳米Silicalite-1沸石晶粒的形貌和性质的影响. 实验发现, 在稀溶液体系中 P123 组装的沸石颗粒既在低角区呈现出介孔材料的特性, 又在高角区表现出沸石的结构特征; TEM证实纳米粒子间存在无序的蠕虫状介孔孔道.     

锂离子电池固态电解质的研究进展

和传统电解液相比,固态电解质热稳定性好,电位窗高,力学性能好且对环境友好;更重要地,由固态电解质组成的锂离子电池能量密度比传统锂离子电池更高,因而成为当前研究的热点。综述了几种主要固态电解质,包括无机固体电解质、固态聚合物电解质、凝胶电解质及复合型电解质的优势、研究进展以及面临的问题,并展望了未来固态电解质的发展趋势。     

基于Web 2.0的边与节点同时增长网络模型

模拟了Web2.0网络的发展过程并研究其拓扑结构,分析某门户网站实际博客数据的度分布、节点度时间变化,发现与先前的无标度网络模型有所差别.根据真实网络的生长特点,提出了边与节点同时增长的网络模型,包括随机连接及近邻互联的网络构造规则.仿真研究表明,模拟的网络更接近实际,在没有优先连接过程时,模型能得到幂率的度分布;并且网络有更大的聚类系数以及正的度相关性。     

The direct ionization processes in the collisions of partially stripped carbon and oxygen ions with helium atoms at low-to-intermediate energies

The values of direct double- to-single ionization ratio R of helium atoms induced by C^q＋, O^q＋ （q = 1 -4） ions at incident energies from 0.2 to 8.5MeV are measured. Based on the existing model （Shao J X, Chen X M and Ding B W 2007 Phys. Rev. A 75 012701） the effective charge of the projectile is introduced to theoretically estimate the value of R for the partially stripped ions impacting on helium atoms. The results calculated from our ＂effective charge＂ model are in good agreement with the experimental data, and the dependence of the effective charge on the ionization energy of the projectile is also discussed qualitatively.     

基于多分辨率色彩传递的彩色夜视方法研究

为了获得符合人眼感知的彩色夜视图像,帮助观察者获取丰富的场景信息和舒适的观察效果,提出了一种基于多分辨率色彩传递的彩色夜视处理方法.结合微光与红外图像特点,对二者进行YUV空间拮抗视觉特性的彩色融合之后,采用控向金字塔对彩色融合图像(源图像)和参考图像各颜色通道进行多分辨率分解,计算子带图像的均值和标准方差,通过参考图像与源图像在各子带的方差比调整源图像的子带系数值,再经金字塔重构,最终使微光与红外彩色夜视图像获得类似参考图像的自然感色彩.分析了lαβ、YUV和RGB颜色空间对色彩传递的影响,并确定YUV颜色空间更适于多分辨率分解的色彩传递.相比传统的线性色彩传递方法,本方法不仅使彩色夜视图像拥有更符合真实场景的色彩,还可以提高其细节信息,改善场景感知,提升融合图像目标探测能力.     

功能蛋白纳米材料在环境保护中的应用

蛋白质是一类结构稳定、官能基团丰富的生物大分子.近年来基于功能蛋白纳米材料的改性制备逐渐成为环境领域的研究热点.其中多巴胺、淀粉样纤维和蛋白质杂化纳米花是最具代表性的三类功能蛋白纳米材料.受海洋生物贻贝启发,多巴胺在碱性条件下可氧化自聚成富有黏性的聚多巴胺涂层广泛用于界面改性;淀粉样纤维是功能蛋白经热处理或化学变性形成...     

可见近红外波段光谱辐射采集系统的设计与应用

针对目前卫星遥感器进行场地定标的光谱观测仪器的应用需求，设计了可见近红外波段(0.4 μm~1.0 μm)的光谱辐射采集电路系统，并结合光谱辐射采集模块进行了应用与数据分析。重点介绍了线阵探测器的选型与驱动需求，并完成了基于STM32微处理器的设计。结合辐射观测需求，在信号处理部分使用仪表放大器运放对探测器的模拟输出信号进行处理，并采用STM32内部的A/D转换器采集。分析数字信号输出的结果，该辐射测量电路系统的的采集数据达到了1 LSB的数据精度(≤0.8 mV)。探测器电路系统应用到光谱辐射采集模块中，进行了户外应用与数据分析，光谱辐照度比对结果的偏差小于5%。光谱辐照度的比对结果证明整个系统可以直接进行产品应用，满足野外辐射测量数据的可靠性获取。     

Enhancement of water self-diffusion at super-hydrophilic surface with ordered water

It has been well acknowledged that molecular water structures at the interface play an important role in the surface properties, such as wetting behavior or surface frictions. Using molecular dynamics simulation, we show that the water self-diffusion on the top of the first ordered water layer can be enhanced near a super-hydrophilic solid surface. This is attributed to the fewer number of hydrogen bonds between the first ordered water layer and water molecules above this layer, where the ordered water structures induce much slower relaxation behavior of water dipole and longer lifetime of hydrogen bonds formed within the first layer.     

α型β级Bazilevi?函数的Milin系数估计和相邻系数问题

该文讨论了α型β级Bazilevi?函数上的Milin系数和相邻系数模之差的估计,得到准确结果,推广了一些已有结论;另外,作为特例给出Milin函数的几何特征.     

Detailed structural,mechanical,and electronic study of five structures for CaF2 under high pressure

Detailed density functional theory(DFT)calculations of the structural,mechanical,thermodynamic,and electronicproperties of crystalline CaF2 with five different structures in the pressure range of 0 GPa–150 GPa are performed byboth GGA(generalized gradient approximation)-PBE(Perdew–Burke–Ernzerhof)and LDA(local density approximation)-CAPZ(Cambridge Serial Total Energy Package).It is found that the enthalpy differences imply that the fluorite phase→PbCl2-type phase→Ni2In-type phase transition in CaF2 occurs at PGGA1=8.0 GPa,PGGA2=111.4 GPa by usingthe XC of GGA,and PLDA1=4.5 GPa,PLDA2=101.7 GPa by LDA,respectively,which is consistent with previousexperiments and theoretical conclusions.Moreover,the enthalpy differences between PbCl2-type and Ni2In-type phases inone molecular formula become very small at the pressure of about 100 GPa,indicating the possibility of coexistence of twophase at high pressures.This may be the reason why the transition pressure of the second phase transition in other reportsis so huge(68 GPa–278 GPa).The volume changed in the second phase transition are also consistent with the enthalpydifference result.Besides,the pressure dependence of mechanical and thermodynamic properties of CaF2 is studied.Itis found that the high-pressure phase of Ni2In-type structure has better stiffness in CaF2 crystal,and the hardness of thematerial has hardly changed in the second phase transition.Finally,the electronic structure of CaF2 is also analyzed withthe change of pressure.By analyzing the band gap and density of states,the large band gap indicates the CaF2 crystal isalways an insulator at 0 GPa–150 GPa.