线性模型M—估计下误差密度估计的相合性

线性模型Ｙｉ＝ｘ′ｉβ＋ｅｉ,ｉ＝１,２,…,其中ｅｉ｛｝∞ｉ＝１ｉｄ．,有未知密度ｆ（ｘ）．讨论了在对β作一般估计后,基于残差作出的误差密度核估计的相合性．在比文献［７,８］弱的条件下,证明了误差密度核估计的逐点弱相合,逐点强相合和一致强相合．     

微机在陀螺找北装置中的应用

陀螺找北装置是利用陀螺仪的定轴性和进动性原理而制成的一种自主式导般系统,适应于全天候作业。本文介绍用捷联式初始对准原理构成装置的数学模型,并采用16位微处理系统进行误差补偿、控制和计算,实现快速自动找北。     

论入世后我国银行财务面临的挑战与机遇

加入WTO，为我国的经济发展提供新的契机，对我国的金融业而言也将是机遇和挑战并存。本着重分析了加入WTO对我国金融业银行财务的影响，并针对其面临的挑战提出了相应的应对策略。     

中国石化产业创新系统研究

石化产业作为国际竞争异常激烈的产业,它在我国国民经济发展中具有重要的战略地位。从技术、组织和制度三个方面对影响我国石化产业创新的障碍性因素进行分析,研究构建了中国石化产业创新系统结构模型,并对该系统结构进行分析。     

美国先进核能技术发展动态分析与启示

 随着全球经济结构调整和核能产业的技术升级,美国无论是从国家政策层面,还是从具体的项目推进看,先进核能技术都已成为其能源发展的必然选择。从法律法规、战略规划、科研经费和重大项目部署等方面,梳理了美国近年来在先进核能领域所采取的一系列措施,分析了美国为推动先进核能创新发展所采取的措施和办法,为中国核能产业结构调整提供参考。     

Radiation-induced precipitation of transmutation elements rhenium/osmium and their effects on hydrogen behavior in tungsten

Here,we review recent computational findings focused on the behavior of transmutation elements (TEs) in Tungsten (W).W is chosen as one of the most promising materials for the divertor armor and plasma facing components in future fusion reactors.However,W in exposure of fusion neutrons can cause the transmutation reaction and produce TEs,such as rhenium and osmium.The presence of TEs can change chemical component of materials,and therefore inevitably influence the microstructure and properties of W materials.Multiscale simulation methods have been employed to investigate the dissolution,diffusion and radiation induced precipitation of TEs,as well as their effects on the behaviors of hydrogen isotopes in W.This systematic review can provide an insightful understanding to estimate the influence of TEs on the properties and performance of Wbased materials.     

Earth-abundant photovoltaic semiconductor NaSbS_2 in the rocksalt-derived structure:A first-principles study

NaSbS_2 was recently proposed as a novel photovoltaic semiconductor with earth-abundant component elements,but its fundamental material properties have not been well studied.The systematical first-principles calculations for its electronic,optical and defect properties were carried out in the present study,and the results show that:i)NaSbS_2 in the rocksalt-derived structure has a quasi-direct band gap and thus may have long minority carrier lifetime;ii) its absorption coefficients are as high as 10~4～10~5 cm~(-1) for the visible light and almost isotropic despite that the structure is distorted relative to the high-symmetry rocksalt structure;iii) the effective masses of the electron and hole carriers are anisotropic with much larger values along the z direction than in the x-y plane,and hence the orientational control of thin films should be important for enhancing the photovoltaic performance;iv) the valence and conduction band edges of NaSbS_2 are close to those of CuGaSe_2) so the n-CdS/pCuGaSe_2 device structure can be inherited to form the n-CdS/p-NaSbS_2 solar cells;v) the acceptor defects (Na_(Sb)antisites and Na vacancies) have very high concentration,making the synthesized NaSbS_2 always be p-type;vi)the S-rich condition can suppress the formation of deep-level donor defects (S vacancies and Sb_(Na) antisites) and therefore should be adopted for fabricating high-efficiency NaSbS_2 solar cells.     

Recent advances in non-toxic quantum dots and their biomedical applications

Quantum dots (QDs) with unique quantum confinement effect and electro-optical properties are attractive for biomedical applications. Toxic effects of traditional semiconductor QDs made of heavy metal ions have serious safety concerns for their undesired environmental or healthy impact. Recent reports on core-shell structure modification of QDs by using biocompatible ligands or polymers is one way to be effectively minimizing toxicity effects of traditional QDs. Furthermore, designs of heave metal-free and metal-free QDs formulations are more promising alternatives, due to the non-toxic and eco-friendly nature of the starting materials. In article, we will review the recent designs of non-toxic or less toxic QDs, including carbon-based, biomolecules-based, silicon-based, and ternary I-III-VI QDs, and their biological applications (bio-imaging, drug delivery, gene therapy and immunoassay).     

Suitable energy platform significantly improves charge separation of g-C_3N_4 for CO_2 reduction and pollutant oxidation under visible-light

The photocatalytic activities of g-C_3N_4 can be significantly improved by increasing life time of the photogenerated charges. Here, in this work we introduced TiO_2 as proper energy platform to accept the photogenerated electrons from g-C_3N_4 during photocatalysis. The nanophotocatalysts formed from the combination of a suitable amount of TiO_2 nanoparticles and g-C_3N_4 nanosheets showed 8.75 and 4.22% enhancement in photocatalytic activities for CO_2 reduction and 2-chlorophenol(2-CP) degradation under visible light illumination as compared to bare g-C_3N_4. Based on the surface photovoltage spectra, photoluminescence spectra and examination of formed hydroxyl radicals, it was confirmed that these enhanced photoactivities were attributed to the much-improved charge separation via the electron transfer from g-C_3N_4 to TiO_2. From trapping experiments,it was found that hydroxyl radicals were the major species involved in the photocatalytic degradation of 2-CP.This study is helpful to synthesize efficient photocatalysts to cope with energy and environmental issues.     

探析活系统模型:发展、模型及系统方 法简

斯塔福德·比尔成功汲取系统论、控制论、信息论领域的研究成果，并将这些成果成功引入组织管理之中，成功的创建了活系统模型，本文力求厘清活系统模型的发展脉络，探讨活系统模型的萌芽与创立的历史进程，并在此基础上分析该模型及其系统方法，旨在更全面地了解和研究活系统模型。