Application of the nonlinear crystal SrB4O7 for ultrafast diagnostics converting to wavelengths as short as 125 nm

We used non-phase-matched second-harmonic generation (SHG) in the highly nonlinear but low-birefringence crystal SrB4O7 for temporal characterization (autocorrelation) of femtosecond UV pulses to convert these pulses to wavelengths as low as 125 nm, close to the transparency limit of SrB4O7. The sensitivity of this method was approximately 1 microJ at the fundamental for a repetition rate of 1 kHz. We also used SHG at longer wavelengths to estimate the three nonlinear coefficients of SrB4O7.     

Discussion on the choice of separated components in fMRI data analysis by spatial independent component analysis

By measuring the changes of magnetic resonance signals during a stimulation, the functional magnetic resonance imaging (fMRI) is able to localize the neural activation in the brain. In this report, we discuss the fMRI application of the spatial independent component analysis (spatial ICA), which maximizes statistical independence over spatial images. Included simulations show the possibility of the spatial ICA on discriminating asynchronous activations or different response patterns in an fMRI data set. An in vivo visual stimulation fMRI test was conducted, and the result shows a proper sum of the separated components as the final image is better than a single component, using fMRI data analysis by spatial ICA. Our result means that spatial ICA is a useful tool for the detection of different response activations and suggests that a proper sum of the separated independent components should be used for the imaging result of fMRI data processing.     

甲烷压缩因子的测定

本文根据Burnett方法,利用已有的实验装置,对温度分别为25℃、50℃,压力达到10MPa的甲烷气体进行了实验研究,得到了相应状态下的甲烷的维里系数和压缩因子;并且对照文献值作了比较。误差分析表明结果良好。     

新的油井岩样荧光直照检测方法

本文从油井岩样及其氯仿浸出物的荧光光谱分析入手,对当前石油勘探系统中亟待改进的目视荧光直照检测方法进行了全面的实验和理论研究。     

Analytical calculation of the collimated detector response for the characterization of nuclear waste drums by segmented gamma scanning

Improved methods for the reconstruction of the isotope specific activity content in nuclear waste drums with data obtained by a gamma scanning system developed at Shanghai Jiao Tong University require an analytical function of the detector response. In this work we derive an analytical detector response function for a collimated HPGe detector with a square collimation window. The model is based on a purely geometric model respecting the configuration of the collimated detector system, the positions of radioactive point sources and the absorption of γ-rays in the matrix as well as in the HPGe crystal. We show that the derived analytical detector response function is in good agreement with data simulated by MCNP5.     

The model of chaotic sequences based on adaptive particle swarm optimization arithmetic combined with seasonal term

Within a competitive electric power market, electricity price is one of the core elements, which is crucial to all the market participants. Accurately forecasting of electricity price becomes highly desirable. This paper propose a forecasting model of electricity price using chaotic sequences for forecasting of short term electricity price in the Australian power market. One modified model is applies seasonal adjustment and another modified model is employed seasonal adjustment and adaptive particle swarm optimization (APSO) that determines the parameters for the chaotic system. The experimental results show that the proposed methods performs noticeably better than the traditional chaotic algorithm.     

双穴二氧四胺Cu(Ⅱ)和Ni(Ⅱ)配合物的合成和性质

本文合成了二种新配体，Ｎ，Ｎ＇－双［水杨醛缩（２－氨乙基）］乙二酰胺（ｄｓａｅ）和Ｎ，Ｎ＇－双［水杨醛缩（２－氨乙基）］丙二酰胺（ｄｓａｐ）及其Ｃｕ、Ｎｉ的配合物，并用元素分析、红外、摩尔电导、磁化率表征，测定了ＣｕＨ－２ｄｓａｐ配合物的稳定常数，结果表明Ｃｕ、Ｎｉ与ｄｓａｅ生成双核配合物，Ｃｕ与ｄｓａｐ生成单核配合物，并对其原因进行了讨论。