塔里木盆地富满油田二叠系玄武岩井壁稳定技术研究及应用

塔里木盆地富满油田二叠系普遍发育有玄武岩,玄武岩段钻进易发生井壁失稳,引起卡钻等井下故障复杂,影响了在该区块钻井时效和经济效益。通过对二叠系玄武岩进一步结构特征研究、易垮井地震相态特征及实钻特征研究、理化特性、地应力、坍塌压力研究,确定引起井壁失稳的原因。根据该区块现场实钻资料及井壁失稳处理经验,从强化钻井液封堵性、控制滤失量、提高钻井液抑制性、携岩能力、密度优选、控制工程参数等几个方面给出避免二叠系玄武岩井壁失稳的处理建议。研究成果在AM3井应用成功,效果显著,对指导富满油田二叠系玄武岩钻进具有一定的指导意义。     

A comprehensive analysis of factors influencing the injury severity of large-truck crashes

Given the importance of trucking to the economic well being of a country and the safety concerns posed by the trucks, a study of large-truck crashes is critical. This paper contributes by undertaking an extensive analysis of the empirical factors affecting injury severity of large-truck crashes. Data from a recent, nationally representative sample of large-truck crashes are examined to determine the factors affecting the overall injury severity of these crashes. The explanatory factors include the characteristics of the crash, vehicle(s), and the driver(s). The injury severity was modeled using two measures. Several similarities and some differences were observed across the two models which underscore the need for improved accuracy in the assessment of injury severity of crashes. The estimated models capture the marginal effects of a variety of explanatory factors simultaneously. In particular, the models indicate the impacts of several driver behavior variables on the severity of the crashes, after controlling for a variety of other factors. For example, driver distraction (truck drivers), alcohol use (car drivers), and emotional factors (car drivers) are found to be associated with higher severity crashes. A further interesting finding is the strong statistical significance of several dummy variables that indicate missing data – these reflect how the nature of the crash itself could affect the completeness of the data. Future efforts should seek to collect such data more comprehensively so that the true effects of these aspects on the crash severity can be determined.     

电气化铁路接入末端电网的三相不平衡影响因素分析

近年来,伴随着电气化铁路接入新疆电网,致使新疆电网末端弱联系地区电能质量问题突显出来,文中针对格库铁路接入新疆巴州地区电网带来的三相不平衡问题开展影响因素分析。首先,根据三相电压不平衡的概念及表达式开展电气化铁路负序三相不平衡的分析计算,得出三相不平衡的影响因素;然后,基于电力电气以及电能管理的综合分析软件(简称ETAP)搭建格库铁路接入新疆电网的典型仿真模型,仿真分析格库铁路接入末端弱联系电网带来的三相不平衡问题的影响因素;最后,分析基于实测数据的负序电流及电压产生的三相不平衡对电力系统及用户的影响,并利用ETAP软件分别从电铁侧和电网侧验证改善三相电压不平衡措施的有效性。     

浅埋大跨连拱隧道施工中变形的监测与控制措施

详细介绍了京珠高速公路某双连拱隧道采用三导洞超前法施工过程中变形的现场监测结果与分析 ,提出了抑制变形的工程措施 ,对后续工程施工具有指导意义。     

立足农村看民生新医疗卫生体制改革调研

通过对农村新医疗卫生体制改革调研,分析百强县和贫困县存在的问题,提出措施和建议。     

Distance measures for medical image retrieval

Imaging has occupied a huge role in the management of patients, whether hospitalized or not. Depending on the patient's clinical problem, a variety of imaging modalities were available for use. Radiology is the branch of medical science dealing with medical imaging. It may use X‐ray machines or other such radiation devices. It also uses techniques that do not involve radiation, such as magnetic resonance imaging (MRI) and ultrasound (US). Commonly used imaging modalities include plain radiography, computed tomography (CT), MRI, US, and nuclear imaging techniques. Each of these modalities has strengths and limitations which dictates its use in diagnosis. The usage of modality for a particular problem must be reviewed with emphasis on method of generating an image with costs, strengths and weaknesses, and associated risks. The reason for image retrieval is due to increase in acquisition of images. Physicians and radiologists feel better while using retrieval techniques for faster remedy in surgery and medicine due to the following reasons: giving details to the patients, searching the present and past records from the larger databases, and giving solutions to them in a faster and more accurate way. Similarity measures are one of the techniques that help us in retrieval of medical images. Similarity measures also termed as distance metrics, which plays an important role in CBIR and CBMIR. They calculate the visual similarities between the query image and images in the database which were ranked by their similarities with the query image. Different similarity measures have different effects in an image retrieval system significantly. So, it is important to find the best distance metrics for CBIR system. In this article, various distance methods were used and then they are compared for effective medical image retrieval. A double‐step approach is followed for effective retrieval. This article describes some easily computable distance measures for medical image retrieval using measures such as probability, mean, standard deviation, skew, energy, and entropy. The distance measures used are Euclidean, Manhattan, Mahalanobis, Canberra, Bray‐Curtis, squared chord, and Squared chi‐squared. Two kind of decision rules precision and accuracy were used for measuring retrieval. A dataset is created using various imaging modalities like CT, MRI, and US images. From the final results, it is very clear that each distance metric with each measures shows different results in retrieval of medical images. It is found that the distance metrics with all the measures shows different precision and recall value calculated from their retrieved medical images. The best retrieval results for Euclidean distance metric is only with probability measure showing 75% of precision and 30% of recall when comparing with other measures. The best retrieval results for Manhattan distance metric is only with mean as a measure giving 50% of precision and 20% of recall when compared its performance with other measures in the retrieval of medical images. The best retrieval results for Mahalanobis distance metric is only with probability as a measure giving 75% of precision and 30% of recall when compared its performance with other measures in the retrieval of medical images. The best retrieval results for Canberra distance metric is only with mean as a measure giving 50% of precision and 20% of recall when compared its performance with other measures in the retrieval of medical images. The best retrieval results for Bray‐Curtis distance metric is only with mean as a measure giving 50% of precision and 20% of recall when compared its performance with other measures in the retrieval of medical images. The best retrieval results for squared‐chord distance metric is only with mean as a measure giving 50% of precision and 20% of recall when compared its performance with other measures in the retrieval of medical images. The best retrieval results for squared chi‐chord distance metric is only with mean as a measure showing 50% of precision and 20% of recall when compared its performance with other measures in the retrieval of medical images. These results indicate that these easily computable similarity distance measures have a wide variety of medical image retrieval applications. © 2013 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 23, 9–21, 2013     

北方冬季高炉无料钟炉顶的稳定运行改造

本文主要阐述高炉无料钟炉顶设备的运行使用与生产过程的联系,由于东北冬季室外温度较低,怎样保证炉顶设备在低温气候能满足正常高炉生产运行就是重中之重,根据现场设备不足与其他外界因素的制约,结合与对设备掌握的理论基础和自己的实际工作经验,浅谈几点满足冬季运行的工作手段及措施。     

纠正、纠正措施及预防措施在产品质量控制中的应用

通过阐述纠正、纠正措施、预防措施的定义、区别和在实际工作中的应用，使从事质量工作的相关人员能够更好地控制产品质量。     

探讨建筑工程技术管理中控制要点与优化措施

文章主要阐述建筑工程施工技术的控制要点和优化措施,目的就是说明建筑施工单位加强建筑施工技术管理的重要性,以供参考。     

建筑工程安全生产管理的特点与措施

随着我国市场经济的迅猛发展,建筑行业已经成为社会经济的重要支柱之一。在建筑行业高速发展的今天,探讨建筑工程施工质量和安全的管理,可以促进建筑工程施工质量与安全管理水平的提高,有利于建筑行业的健康快速发展。