超声弹性应变率值在鉴别乳腺炎与乳腺癌中的应用分析

目的：探讨超声弹性应变率值在乳腺炎与乳腺癌患者中的鉴别及应用效果。方法：选择2015年6月至2017年10月入院治疗的乳腺癌患者48例和乳腺炎患者50例,分别设乳腺炎组和乳腺癌组。两组入院后均采用日立图腾彩超诊断仪对患者进行诊断,检查时患者先行常规二维超声检查,然后对患者进行弹性图像检查,选择感兴趣区域,采用系统软件计算出弹性应变率比值,绘制ROC曲线,分析超声弹性应变率值在乳腺炎与乳腺癌患者中的诊断、鉴别效能。结果：乳腺癌与乳腺炎患者均经过病理检查得到确诊,乳腺癌类型中排在前两位为浸润性导管癌、导管内癌,分别占68.75%和16.67%;乳腺炎排在前两位为导管壁增厚,周围伴有炎细胞浸润和导管壁结构破坏伴结核样肉芽肿,分别占36.0%和34.0%;乳腺炎组与乳腺癌组均顺利完成弹性图像检查,乳腺癌组超声弹性应变率值,高于乳腺炎组（P<0.05）;ROC曲线结果表明,超声弹性应变率ROC曲线下面积为0.935,诊断乳腺炎、乳腺癌敏感度、特异度及准确度分别为93.1%、90.2%和85.7%。结论：将超声弹性应变率值用于乳腺癌和乳腺炎鉴别中效果理想,能获得较高的诊断效能,能为临床治疗提供依据和参考,值得推广应用。     

Influence of the Arctic on the Predictability of Eurasian Winter Extreme Weather Events

The linkage between the Arctic and midlatitudes has received much attention recently due to the rapidly changing climate. Many investigations have been conducted to reveal the relationship between the Arctic and Eurasian extreme events from the perspective of climatological statistics. As a prediction source for extreme events in Eurasia, Arctic conditions are crucial for extreme event predictions. Therefore, it is urgent to explore the Arctic influence on the predictability of Eurasian extreme ...     

Application of entropy analysis of in situ droplet-size spectra in evaluation of oil chemical dispersion efficacy

In situ droplet-size distributions were measured using a laser in situ scattering and transmissiometry (LISST-100X) particle size analyzer during the evaluation of natural and chemical dispersion efficiency of crude oils under different wave and current conditions. An entropy grouping of the in situ dispersed oil droplet-size spectra has classified the multi-modal droplet-size distributions into different groups based on similar droplet-size spectra characteristics within groups and distinction between groups. A generalized linear logistic regression model was fitted to analyze the effects of a number of factors and their interactions on the grouping of oil droplet-size spectra. The grouped results corresponded to the oil dispersion efficiency at different levels. This new method for droplet-size distribution data analysis can have significant implication in field evaluation of natural and chemical dispersion efficiency of oil.     

金县短水准预报效能的研究

本文首次给出了金县台人工地震探测的最新结果。论述了跨断层短水准还可开发利用的前兆信息资源,并利用层次合成模型对金县短水准异常信息作了两个层次合成,使其地震预报效能较传统方法有了较大幅度提高,其前兆信息水平约60％、预报地震成功率达54％、地震报准率达72％,说明前兆异常信息的层次合成是提高单台单项目地震预报效能经济而有效的方法之一。     

Experimental study on low temperature performance of polymer drilling mud agents

Drilling fluid additives has a major impact on rheology behavior and other performances of the drilling fluid. The key to low temperature drilling fluids is choosing antifreeze and polymer agent which have a strong ability in resisting low temperature. On the basis of determining glycol as antifreeze agent, the low-temperature-performance and capacities of anti-collapse of regular validity mud agents have been studied, the mechanism of anti-caving of the partially hydrolyzed polyacrylamide (PHPA), polypropylene potassium (KPA) and PAC-141 polymer additives have been also analyzed. A pilot study of compatibility between ethylene glycol and the polymers has educed that the polymers, ethylene glycol and inorganic salt are compatible, and they can significantly reduce the freezing point of drilling fluid. Anti-collapse ability of the drilling mud is the results of synergistic action among the agents.     

山东黄河下游区域生态地球化学评价方法技术探讨

山东黄河下游区域生态地球化学评价是以多目标区域地球化学调查资料为基础,在5．3万km^2范围内按一定的采样密度采集大气干湿沉降、化肥、大宗农作物（小麦、玉米的籽实、茎叶和根系土）样品,分析As,Cd等重金属元素和N,B等有益营养元素含量,研究元素在农业生态系统中的输入、输出通量,进行农业生态系统评价。采集济南、济宁2城市冶金尘、燃煤尘、建筑尘、汽车尾气尘等不同端元组分样品和大气干湿沉降、城市降尘、城市表层土壤样品,进行As,Cd等重金属元素含量及降尘铅同位素组成、粒径和物相分析,研究2城市各类污染物对城市大气和土壤排放量、排放比例和污染程度,评价其对城市生态环境影响。采集黄河、徒骇河、小清河等人海河流的悬浮物、水体、底泥及河流入海口处2m深柱状样品,分析As,Cd等重金属元素含量,对典型柱状样进行^210Pb和^137Cs定年,研究重金属元素随时间的变化规律,获取底积物年沉积速率,分析陆源物质对浅海沉积环境变迁的影响,对浅海生态环境安全性进行预警。     

富营养化和海水盐度对日本鳗草生物量和碳氮含量的协同影响

营养盐和盐度对海草的生长和生理都具有重要影响,但二者对海草的协同作用还未见报道。本研究以日本鳗草(Zosterajaponica)为对象,在室内可控条件下进行营养盐和盐度对日本鳗草的协同影响研究。实验结果显示,营养盐和盐度对日本鳗草地上生物量、地上部分C含量、地下部分C含量均有显著的协同影响。日本鳗草组织中的营养盐含量(Nt)与盐度有显著相关性,但并未受到营养盐和盐度的协同影响。营养盐和盐度会协同影响海草的固碳能力,并同时影响其对硝酸盐的吸收。     

Spatiotemporal characteristics and driving mechanism of the coupling coordination degree of urbanization and ecological environment in Kazakhstan

Journal of Geographical Sciences - When viewed against the backdrop of globalization and the Belt and Road Initiative (BRI), Central Asia has ushered in new development opportunities. However,...     

Ultrasound Accelerated Oxidation of Organic Dyes by a Micron‐Sized Copper/Peroxomonosulfate System

Experiments on the degradation of acid orange 7 (AO7) using micron‐sized zero‐valent copper (ZVC) are conducted in acidic aqueous solution under ultrasonic (US) irradiation. The US/ZVC/peroxymonosulfate (PMS) process for AO7 degradation is significantly better than that of an independent system. Based on the characterization of ZVC, it is observed that the corrosion speed of ZVC increases after ultrasound, owing to which a greater amount of Cu⁺ (0–3.03 mg L^?1) and Cu²⁺ are produced. Exposure to US irradiation increases the available surface area of the catalysts to generate many new reactive sites for the degradation process. The AO7 degradation rate after the addition of a new copper reagent—neocuproine hemihydrate—from 6.33% to 100% proved that Cu⁺ is the main activator of PMS. Results indicated that free radicals (OH^? and SO₄^??) act as activators of PMS in the process. And higher ultrasound power, lower solution pH, and a larger ZVC dose are favorable for AO7 removal.     

区域政策项目评价的基本问题与分析框架

区域政策评价是区域政策程序中的一个重要环节,但目前对有关的基本问题尚缺乏统一的认识,区域政策项目评价十分不规范。文章将分析区域政策评价的内涵、特点与作用,从区域政策干预逻辑的角度讨论区域政策效应评价的重要基本概念以及这些概念之间的关系,并在此基础上进一步讨论反映区域政策效应与效益的指标。作者认为,科学地确定区域政策评价的范围与内容,是统筹区域发展的必然要求。是完善中国区域政策的一个不可或缺的重要内容之一。