CRT用销钉冲压切边工位的模具改进

介绍了CRT用销钉冲压切边工位的模具改进,提出利用冲裁问隙及凹模圆角等因素来达到工艺的特殊要求的一种情况.     

哥伦比亚巴兰基利亚市的APELL进程

本案例研究描述了APELL进程自1995年恢复之后在哥伦比亚巴兰基利亚市实施情况.邀请化工行业的企业加入此项计划,并与地方应急委员会和消防队一起开展活动.本案例研究还包括对一座化学装置中的一场应急演习的详尽描述.     

Indoor and outdoor air concentrations of BTEX and NO2: correlation of repeated measurements

Studies on health effects of air pollutants ideally define exposure through the collection of air samples in the participants' homes. Concentrations derived from these samples are then considered as an estimate for the average concentration of air pollutants in the homes. Conclusions drawn from such studies therefore depend very much on the validity of the measured air pollution concentrations. In this paper we analysed repeated BTEX and NO(2) measurements with a time period of several months lying between the two conducted home visits. We investigated the variability of their concentrations over time by determining correlation coefficients and calculating within- and between-home variances. Our population consisted of 631 homes of participants from two cohort studies within the framework of the German study on Indoor Factors and Genetics in Asthma. Air pollutants were measured using passive samplers both indoors and outdoors. The measured BTEX concentrations were poorly correlated, with Pearson's correlation coefficient r ranging from -0.19 to 0.27. Additionally, a considerable seasonal effect could be observed. A higher correlation was found for the NO(2) concentrations with r ranging between 0.24 and 0.55. For the BTEX, the between-home variance was bigger than the within-home variance, for NO(2) both variances were of about the same order. Our results indicate that in a setting of moderate climate like in Germany, the variability of BTEX and NO(2) concentrations over time is high and a single measurement is a poor surrogate for the long-term concentrations of these air pollutants.     

对战略性环境影响评价体系和方法的研究

从社会、经济、环境高度协调发展的角度，论述了战略性环境影响评价体系的内容，探讨了战略性环境影响评价的实质和特点。在此基础上初步建立了战略性环境影响评价指标体系，提出了一种新的评价方法——综合协调效益法。这对促进环境影响评价学科的发展有重要的意义。     

带压堵漏技术在煤气管道上的应用

济钢焦化厂处理煤气管道环形焊缝泄漏点采取了不停产带压堵漏技术，将特制的卡子固定在煤气管道上的泄漏部分，再用活动法兰连接，从而达到堵漏和提高管道强度的目的。     

Assessing drilling mud and technical fluid contamination in rock core and brine samples intended for microbiological monitoring at the CO2 storage site in Ketzin using fluorescent dye tracers

The CO₂SINK project in Ketzin represents a field laboratory for the storage of CO₂ in a 650-m deep saline aquifer. The project is accompanied by a microbiological monitoring programme to characterise the composition and activity of the autochthonous microbial community in rock and brine samples and their changes in response to CO₂ storage. A prerequisite of these studies is the acquisition of samples free of contamination from microorganisms and organic and inorganic components. Drilling mud and technical fluids are the main sources of contamination. This study describes the application of the fluorescent dye tracers fluorescein and rhodamine B as contamination controls for rock core and brine samples. Fluorescein was added to drilling mud that was used during the coring phase of the Ketzin wells Ktzi 200, 201 and 202. In addition, total organic carbon (TOC) concentrations, reflecting the carboxymethyl cellulose (CMC) component of the drilling mud, were determined to verify the tracer results. The fluorescence and TOC analyses revealed that drilling mud filtrate penetrated the outer 20 mm of mildly permeable sandstone cores. Rhodamine B was added to brines that were used to displace the drilling mud and to flush the wells after completion. The tracer monitoring during the discharge of drilling mud and displacement brines from the wells during hydraulic tests and nitrogen lifts enabled the quantification of reservoir fluid quality. After the production of 140–190 m³ (16–21 borehole volumes) of fluid, the drilling mud concentration was reduced to about 0.05%. The use of fluorescein emerged as a field-capable, sensitive and reliable method during the sampling of rock core and formation brine samples.     

从理念到行动:日本建设循环型社会的主要做法

20世纪90年代末,日本政府面对21世纪的环境和资源压力．针对严峻的资源与环境问题,提出了建立循环经济的构想,2000年还把建立循环型社会提升为基本国策,将该年定为“循环型社会元年”,并颁布和实施了《循环型社会形成推动基本法》等6部法律,采职了一系列行动措施,标志着日本进入了推进循环经济,建立循环型社会的全面发展阶段。日本在推进建设循环型社会进程中,理念先进,措施具体,效果明显。其中．完备的立法和严格的执法是根本保障;必要的经济支持和鼓励优惠政策是重要条件;建立生态工业园区,发展静脉产业是典型示范;以政府绿色采购来启动和引导市场需求是有效手段;政府相关部门管理职能强化和职责明晰是组织保证;加强科学研究,发挥公众和中介组织作用是重要措施。     

京津地区生态系统特征与污染防治

前言 京津地区生态系统特征与污染防治的研究是由中国科学院和院外的14个研究所共同承担和完成的。三年来,在京、津两市和河北省廊房地区34000 km~2的范围内,开展了多学科、多层次的区域生态环境研究。 京津地区是我国首都和华北经济中心所在地。建国以来,京津地区的工农业和城市     

Correcting serum concentrations of organochlorine compounds by lipids: Alternatives to the organochlorine/total lipids ratio

IntroductionWhen studying the effects of organochlorine compounds (OCs) on human health it is common to correct serum concentrations of OC by total lipids (TL). However, the relationship between serum OCs and serum TL is far from established in many diseases, including several cancers. Our aim was to analyze the relationship between serum OC and TL in patients with pancreatic ductal adenocarcinoma (PDA), and to explore several alternatives to perform the OC lipid correction.MethodsIncident cases of PDA were interviewed and had blood drawn soon around hospital admission (n = 144). Serum concentrations of OCs were analysed by high-resolution gas chromatography with electron-capture detection.ResultsMost patients with high TL had moderate or low concentrations of OCs. By contrast, the variability of OC values among patients with normal TL was large. Correlations were of a similar magnitude between OC and TL and between OC and total cholesterol; while these correlations were weak (all Spearman's ρ < 0.3 and R² < 0.11), no OC were significantly correlated with triglycerides. Although all alternatives to the OC/TL linear ratio were statistically significant for at least one OC, their R² was always below 10%.ConclusionsIn patients with severe diseases as PDA, linear correction of OC by TL as commonly performed in epidemiologic studies may be inappropriate. Results contribute to the scant literature on the rationale to correct serum concentrations of OC by lipids. They suggest that it is unwarranted to routinely correct OC by TL, offer ways to assess such need, and present alternatives as no TL correction, correction by total cholesterol only or use of different statistical models.