NaI多道脉冲幅度分析系统在燃料元件破损监测中的应用研究

介绍了船用堆燃料元件破损监测中较常用的两种方法.通过分析其缺陷,提出了用NaI多道脉冲幅度分析系统测量特征核素(131I、137Cs)的方法,有效避免了监测中的干扰因素的影响,降低了定量监测中的误报率,提高了燃料元件破损监测的效率和置信度.     

地震相控非线性随机反演研究与应用

 在地震相模型控制下，通过原始数据将各个单一反演问题转化为一个联合反演问题，可降低反演在描述参数几何形态时的单个反演问题的自由度，从本质上提高地球物理反演的效果。本文在计算过程中采用了非线性随机反演算法，能有效提高地震资料的分辨率，并充分考虑地质条件的随机特性，使反演结果更符合实际地质情况。在胜利、中原油田等地区的储层预测中，应用本文方法均取得了良好的效果，为岩性油气藏勘探提供了可靠基础数据。     

低渗透压敏油藏油井流入动态方程及其应用

注水开发的低渗透油藏存在启动压力和压力敏感性,使开发难度加大。当流压低于饱和压力以后,流入动态指示曲线凹向压力轴,会出现一个产量最大点。在前人研究的基础上,从平面径向拟稳态渗流规律出发,考虑启动压力梯度和压力敏感效应对油藏渗流的影响,与油相和液相相对流动能力方程相结合,建立了具有最大产量点的低渗透压力敏感油藏直井流入动态方程,据此可对油藏产能进行评价预测,确定出油井最低允许流动压力和油井的合理工作制度。在龙南、新站油田的应用表明,预测值与实测值比较吻合,满足矿场工程精度要求,说明所建立的流入动态方程能有效评价预测油井产能和确定油井允许的最小流压界限,为充分发挥油井生产能力、合理高效开发低渗透压力敏感油藏提供了理论依据。     

川东二叠系生物礁油气藏的地震勘探技术

 生物礁油气藏是一种特殊的岩性油气藏，由于其地质特点的多样性和复杂性，使得生物礁的地震勘探难度很大。本文针对川东地区二叠系生物礁的地质特点和资料情况，以生物礁气藏为研究对象，从已知井井震响应特征分析出发，通过地震反射结构分析、神经网络波形分类处理、地震属性分析、三维可视化解释、多参数地震反演等多项地震特殊处理和解释方法，建立了生物礁和生物礁储层的判别模式，形成了有针对性的地震勘探配套技术。其中以伽马、补偿中子及声波为目标曲线的多参数地震反演技术对于预测和评价生物礁特别有效。     

The intervalley X6→Γ6, L6 scattering time in GaAs measured by ultrafast pump-probe infrared absorption spectroscopy

A direct measurement of the dynamics of electrons in the X₆ valley for a GaAs crystal by time-resolved absorption spectroscopy is reported for the first time. IR picosecond probe pulses were used to monitor the growth and decay of the population in the X₆ valley subsequent to excitation by a 527 nm pump pulse. The intervalley X₆→Γ₆, L₆ scattering time t_x of 0.70 ± 0.50 ps is determined and the crossection for the X₆→X₇ transition is estimated to be 1.8 × 10⁻¹⁶ cm².     

Protein phosphorylation: technologies for the identification of phosphoamino acids

Protein phosphorylation plays a central role in many biological and biomedical phenomena. In this review, while a brief overview of the occurrence and function of protein phosphorylation is given, the primary focus is on studies related to the detection and analysis of phosphorylation both in vivo and in vitro. We focus on phosphorylation of serine, threonine and tyrosine, the most commonly phosphorylated amino acids in eukaryotes. Technologies such as radiolabelling, antibody recognition, chromatographic methods (HPLC, TLC), electrophoresis, Edman sequencing and mass spectrometry are reviewed. We consider the speed, simplicity and sensitivity of tools for detection and identification of protein phosphorylation, as well as quantitation and site characterisation. The limitations of currently available methods are summarised.     

The biology of prothrombin

Prothrombin and thrombin are involved in diverse biological functions. The structure of prothrombin has been studied extensively and its cDNA has been cloned from several species. The tissue-specific expression of this protein has been studied, as well as the developmental expression pattern. The structure of the human gene coding for prothrombin has been determined, and gene regulation studies have been performed that indicate that HNF-1 might be responsible for the liver-specific expression of this protein. Other regulatory elements have been identified. In order to further study the biological properties of prothrombin, prothrombin-deficient mice have been generated using gene targeting technology. Prothrombin deficiency in mice results in partial embryonic lethality. The mice that survive to birth die from bleeding events. The embryonic lethality occurs between embryonic days 9.5 and 11.5 and appears to be due to the loss of integrity of the vasculature due to a failure in blood coagulation. These results indicate that prothrombin plays not only a key role in hemostasis but suggests that it may be important for mouse development.     

云纹图象计算机处理技术的进展及其应用

本文对１９８７年至今国内外光测力学条纹图，主要是云纹图象的计算机采集，处理和力学量提取技术的进展进行了回顾，包括利用通用图象处理程序，直接利用灰度，用付利叶变换对条纹图进行分析，引入相移技术提高灵敏度，利用采色编码提取力学量。以及建立在云纹图特点基础上的新的图象处理技术等；分析了它们各自的优缺点，适用范围和存在的问题，讨论了它们在科究和工程测试中的应用前景。