Characterization of Historical Methane Occurrence Frequencies from U.S. Underground Natural Gas Storage Facilities with Implications for Risk Management,Operations, and Regulatory Policy

Defining a baseline for the frequency of occurrences at underground natural gas storage facilities is critical to maintaining safe operation and to the development of appropriate risk management plans and regulatory approaches. Currently used frequency-estimation methods are reviewed and broadened in this article to include critical factors of cause, severity, and uncertainty that contribute to risk. A Bayesian probabilistic analysis characterizes the aleatoric historical occurrence frequencies given imperfect sampling. Frequencies for the three main storage facility types in the United States (depleted oil-and-gas field storage, aquifer storage, solution-mined salt cavern storage) are generally on the order of 3 to 9 × 10^–2 occurrences, of all causes (surface, well integrity, subsurface integrity) and severities (nuisance, serious, catastrophic), per facility-year. Loss of well integrity is associated with many, but not all, occurrences either within the subsurface or from there up to the surface. The probability of one serious or catastrophic leakage occurrence to the ground surface within the next 10 years, assuming constant number of facilities, is approximately 0.1–0.3% for any facility type. Storage operators and industry regulators can use occurrence frequencies, their associated probabilities and uncertainties, and forecasts of severity magnitudes to better prioritize resources, establish a baseline against which progress toward achieving a reduction target could be measured, and develop more effective mitigation/monitoring/reduction programs in a risk management plan.     

Project Feedback Loops: Visualizing Collection Evaluation Decisions

ABSTRACT

In 2016, a collection assessment project evaluated print serials and book collections at Johns Hopkins University in preparation for an upcoming renovation of the Eisenhower Library. Project metrics provided librarians with both goals and measures of success that varied by humanities, social sciences, and science and engineering—such as estimated number of volumes, decision type, and the percentage of serials staying or moving out of the building. A feedback loop with data visualizations helped reduce anxiety and improve communication across library departments by illustrating volume estimates, linear feet, and shelf height by decision type. Key takeaways include lessons learned about necessary data proficiency for academic librarians and the need for better data from our library software and applications to facilitate future collection evaluation projects for weeding off-site serials.     

广州珠江黄埔大桥南汊主引桥衔接处线形控制技术

基于广州珠江黄埔大桥南汉悬索桥施工特点,针对悬索桥主引桥衔接处纵坡线形控制难题,提出解决方案.对于主桥端部钢箱梁纵坡线形的控制,提出两个调坡原则;对于伸缩缝纵坡线形的控制,提出须解决的关键问题及解决方法.所提方案解决了施工进度与施工工序之间的矛盾.     

车用蓄电池早期损坏的原因及预防

分析了车用蓄电池早期损坏的原因，提出了相应的预防措施。     

考虑井筒储存和表皮效应的变流率问题的精确解

本文用较新的观点，建立了无限大均质地层(考虑井筒储存和表皮效应)中单井系统变流率问题的压力降分布的数学模型，利用Laplace变换法，解出了井底压力变化的精确解析解;并将其无因次化，以便于在实际中用来制作试井分析样板曲线图，并简要地指出了实际应用此精确解的方法。     

综合性大学图书馆外文文献信息服务刍议

根据合并后的内蒙古民族大学的性质和特点 ,就综合性大学图书馆外文文献信息资源共享、建立特色馆藏、做好文献翻译、开展文献检索教学、实行对外开放和为地方经济建设服务等问题 ,做了初步探讨     

对解决空调系统热污染问题的方法探讨

针对目前空调系统使用中存在的热污染问题，分析了热污染产生的原因及影响因素，提出了发展浅地层蓄能空调系统等解决方法。     

An experimental study of thermal energy storage with phase change materials by design of experiments

Accurate theoretical modelling and simulation of thermal energy storage (TES) by means of phase change materials (PCM) is very complex and its results are not close enough to experimental values. This paper presents the empirical study of a thermal storage unit operating with a commercial PCM called RT25. The study is carried out by means of the statistical procedure, Design of Experiments. This methodology has rarely been used in the analysis of heat transfer problems. The present study has allowed us to investigate the phenomena involved and to design an actual system. We show the whole procedure followed in order to design the set-up, to run the experiments with a 2³ factorial design, to compare its results with a numerical simulation and to get the empirical model by regression. Its results have been used to design actual installations aimed at free-cooling or maintaining the temperature constant in rooms where thermal security is necessary.     

单箱三室连续宽箱梁有效宽度分析

箱梁在受弯时，横桥向存在剪力滞效应，为了在计算中应用初等材料力学方法求解，采用了翼缘有效宽度方法。以某实桥为背景，通过对单箱三室连续宽箱梁空间实体模型进行了有限元分析，计算得出了箱梁顶板及底板的有效分布宽度系数ρs及ρf，并与规范值进行了比较，可为同类工程设计提供参考。     

限制犯罪记录流向社会公众的思索与实践——以江苏某基层法院未成年人轻罪犯罪记录封存试点为样本

轻罪犯罪记录封存的功能是限制犯罪记录公开,确保涉及未成年人犯罪的有关资料只在公检法司机关内部流转,避免因犯罪记录外流而引发社会公众对未成年犯的非规范性评价,形成"标签效应"。修正后的《刑事诉讼法》规定了轻罪犯罪记录封存制度,但未明确具体操作程序。江苏某基层法院在犯罪记录封存试点工作中引入听证程序等做法成效显著,为进一步研究和推动形成科学规范的封存操作规程积累了有益经验。