文东地区沙河街组油源对比与注入史研究

运用地球化学研究手段，对文东地区沙二和沙三段原油、油砂和泥岩进行了饱和烃气相色谱-质谱分析，认为沙二和沙三段原油来自沙三段烃源岩；通过对研究区储层流体包裹体的分析，结合原油构造演化资料，对沙二和沙三段油藏的成藏时期进行了分析。沙二段油气藏主要成藏期为东营中后期及抬升剥蚀期，主成藏期为30~17Ma；沙三段为两期油气充注，第一期为在东营初期（距今33~23Ma），为主成藏期；第二期发生在明化镇期（距今10~0Ma）之后。对文东地区成藏模式进行了分析，把文东地区油藏分为近洼原生型、 油源断层控制的调整型和浅层次生型3类。     

The Impact of Consumer Phase Models in Microbial Risk Analysis

In quantitative microbiological risk assessment (QMRA), the consumer phase model (CPM) describes the part of the food chain between purchase of the food product at retail and exposure. Construction of a CPM is complicated by the large variation in consumer food handling practices and a limited availability of data. Therefore, several subjective (simplifying) assumptions have to be made when a CPM is constructed, but with a single CPM their impact on the QMRA results is unclear. We therefore compared the performance of eight published CPMs for Campylobacter in broiler meat in an example of a QMRA, where all the CPMs were analyzed using one single input distribution of concentrations at retail, and the same dose‐response relationship. It was found that, between CPMs, there may be a considerable difference in the estimated probability of illness per serving. However, the estimated relative risk reductions are less different for scenarios modeling the implementation of control measures. For control measures affecting the Campylobacter prevalence, the relative risk is proportional irrespective of the CPM used. However, for control measures affecting the concentration the CPMs show some difference in the estimated relative risk. This difference is largest for scenarios where the aim is to remove the highly contaminated portion from human exposure. Given these results, we conclude that for many purposes it is not necessary to develop a new detailed CPM for each new QMRA. However, more observational data on consumer food handling practices and their impact on microbial transfer and survival are needed to generalize this conclusion.     

拟周期算子的均质化过程

本文研究具振荡拟周期系数的均质化过程,首先得到了拟周期函数的一些有趣性质,然后证明了拟周期算子的一个均质化定理.     

今道有信美学思想及其当代意义

今道有信论美有三大特点:对审美现象多元相位的探索性;勇于突破常识和超越传统的批判性;积极反思存在与关怀终极的人文性。今氏论美启示有三:承认多元,追求超越;感悟智慧,鼓励原创;扎根存在,关怀人文。     

GeTe系非晶相变薄膜的制备及性能研究

介绍了用真空烧结和真空蒸发制备ＧｅＴｅ和ＧｅＴｅＳｂ非晶薄膜的工艺；从热力学的角度分析了发生相变时在两电极之间形成了晶化的导电丝，熵减少。讨论了Ｓｂ的加入对ＧｅＴｅ非晶薄膜性能的影响。利用电阻与温度的关系计算出ＧｅＴｅＳｂ的相变温度，计算结果与实验测定的相变温度接近。最后用衍射对ＧｅＴｅＳｂ薄膜进行了结构分析。     

BX型中变催化剂的晶型研究

本文用透射电子显微及衍射技术对比研究了铁铬系中变催化剂(FeCrK)和 BX 型中变催化剂(FeCrCeK)的晶型,发现经稀土调变后的催化剂其晶型主体为 r—Fe_2O_3,而未经稀土调变的铁铬系催化剂晶型主体为α—Fe_2O_3。主体晶型为γ—Fe_2O_3的催化剂比表面积,活性比主体晶型为α-Fe_2O_3的催化剂要好     

气液两相流体通过孔板诸流量模型的比较和评价

分析和验证了一些具有代表性的两相孔板流动模型,提出了修正均相流动模型。用平方和加权法对它们作了总体评价,并指出各模型的精度高低和应用性能优劣。     

量子Hall效应与Berry相因子

将绝热过程中的Berry相因于的概念推广到简并系统.在对称规范条件下研究了量子Hall效应与Berry相因子之间的关系,导出了量子Hall电导率与Berry相因子之间的关系,理论分析与Klitzing,Tsui等人的实验结果一致.     

对万加特纳模型及罗瑞-萨维奇问题解法的改进

笔者对一种项目投资组合方案优选方法进行了分析,用两阶段双向排序均衡法对经典的万加特纳模型和罗瑞-萨维奇问题的解法给予改进.     

基于联合变换的旋转不变光学图像加密

利用两个彼此独立的编码脉冲相位掩模在联合变换相关器中对需要保护的图像进行编码,实现对原始图像的加密。该方法的特点是解密时加密图像的旋转不会影响解密效果,相位分布是密钥的合法持有者唯一掌握的确定性函数,可以重构,便于实际应用。计算机模拟的结果证明了方法的可行性。