钢包耐材对钢中夹杂物的影响及优化

承钢120 t钢包耐材主要采用铝镁碳质、镁碳质和刚玉质预制块砌筑而成.分析了耐火材料中各组分与钢水的作用及影响机理,研究了钢包耐火材料对钢水中的球状氧化物夹杂、硫化物夹杂、A12 03夹杂等形成的影响.随着钢包使用次数的增加,钢中的夹杂物尺寸、数目均呈上升趋势,提出了减少钢水中夹杂物的具体措施.     

3Cr抗CO2和H2S腐蚀系列油套管开发

CO2、H2S腐蚀是石油天然气开采过程中的主要腐蚀问题。文章在分析油井管CO2腐蚀行为和腐蚀特点的基础上，介绍了抗CO2、H2S腐蚀油套管的研制过程并开发出腐蚀性能良好的3Cr系列经济型油套管。文章重点介绍了80、95、110等不同钢级成品管的力学性能，抗CO2、H2S应力腐蚀开裂性能。运用SEM扫描电境、X光电子能谱仪、X射线衍射、体视显微镜等分析了钢经腐蚀后的表面腐蚀产物的组成、结构，并对Cr元素改善钢的抗CO2腐蚀行为及机理进行了分析。     

海南省矿产资源伴生放射性水平调查

海南省第一次污染源普查工作中,全面系统地进行了海南省矿产资源中伴生放射性水平的调查,基本查清了海南省矿产资源中伴生放射性的种类、分布、数量、去向及污染现状等情况,为海南省辐射环境安全和放射性污染源的监管提供科学依据。提出全省矿产资源开发利用中防治伴生放射性污染的对策建议。     

中国核工业30年过量受照人员临床案例选编(英文)

选编了三十多年来,核工业生产中部分过量受照人员的剂量估算、实验室检查、诊断、治疗及医学随访观察的临床案例。介绍了核工业系统中在防治内照射辐射损伤、皮肤放射损伤及小剂量外照射辐射效应等方面的临床实践经验。     

Size-resolved source apportionment of aerosol particles using polycapillary X-ray lens with a plateau in its focal spot

A laboratory micro X-ray fluorescence spectrometer based on a special polycapillary X-ray lens (PXRL) was used to carry out the source apportionment of aerosol particles. In the curve of the distribution of the X-ray intensity in the focal spot of the special PXRL, there was a plateau with a diameter of 21.3 μm in which the distribution of the X-ray intensity was homogeneous. The gain in flux density in the plateau of the PXRL is 1490. The uniformity of this plateau was 2.9%. This was helpful for the quantitative X-ray fluorescence analysis of a single aerosol particle with smaller size than that of the plateau of the PXRL. The fingerprint database of aerosol particles with given sizes from various air pollution sources was established with the single particle analysis method. The size-resolved source apportionment of aerosol particles in haze in Beijing city was performed with this fingerprint database.     

放射性铈在模拟水稻田中的行为

研究了１４１Ｃｅ在模拟水稻田中的迁移、积累和分布。结果表明，１４１Ｃｅ进入田水后向土壤和水稻迁移，水中１４１Ｃｅ浓度迅速下降。水稻中１４１Ｃｅ浓度显著地高于土壤和田水。田水和土壤中的１４１Ｃｅ浓度随时间延长基本上单调降低，而水稻中１４１Ｃｅ浓度则在经历某一最大值后便下降。土壤对１４１Ｃｅ的吸附迅速，吸附率较高，９５％以上的１４１Ｃｅ滞留于表层４ｃｍ之内；土壤中１４１Ｃｅ浓度与离表面深度呈单项指数负相关。     

镀锌产品表面粗糙度影响因素的研究

以马钢第四钢轧总厂1#镀锌线的产品为研究对象,通过大量的数据检测,分析了热浸镀锌产品带钢表面粗糙度的影响因素,并得出变化规律。这些规律可以运用到实际生产中来对带钢表面的粗糙度进行计算和控制。     

Effect of Pseudomonas fluorescens on beef discoloration and oxymyoglobin oxidation in vitro

The relationship between bacterial growth and oxymyoglobin oxidation in vitro and in meat was studied. In the in vitro study, oxymyoglobin was combined with Pseudomonas fluorescens or sterile nutrient broth (control) in an airtight vessel. P. fluorescens samples showed greater metmyoglobin formation and oxygen consumption than controls. The P. fluorescens population in the reaction vessels was correlated with metmyoglobin formation (r = 0.85, P < 0.05) and oxygen consumption (r = 0.91, P < 0.05). When P. fluorescens and oxymyoglobin were combined in an airtight vessel, reducing the headspace from 13 ml and 9 ml to 3 ml resulted in greater metmyoglobin formation (P < 0.05). In the meat study, beef cores prepared from longissimus lumborum were inoculated with P. fluorescens (10(7) CFU/cm2) or sterile peptone water (control), packaged under 1% O2 (+99% N2), air, or 100% O2 and stored at 4 degrees C. Inoculated beef cores showed higher bacterial loads and metmyoglobin formation than their respective controls during 10 h storage in 1% O2, 3 days in air, and 7 days in 100% O2 (P < 0.05). This finding indicated that P. fluorescens could accelerate beef discoloration. Overall, studies demonstrated that oxygen consumption concomitant with P. fluorescens growth decreased partial oxygen pressure, which accelerated oxymyoglobin oxidation.     

Sediment Resuspension and Hydrodynamics in Lake Okeechobee during the Late Summer

In this study, in order to better understand the mechanisms affecting sediment resuspension, extensive data sets were collected in September and October of 2002 including wind velocity, wave, current velocity, water temperature, total suspended solid, suspended sediment concentration, and total phosphorus. Analyses of these data indicate that waves are the dominant factors in sediment resuspension while wind-induced currents are the primary forces to transport suspended sediments. Surface and bottom currents frequently flow in opposite directions, forming a stratified water column. A time lag exists between currents near lake bottom and wind forcing at the surface. The diurnal thermal stratification occurs in the deep region of the lake. A time lag is also found between suspended sediment concentration and wind speed. The study provides valuable storm-event data and mechanism analyses, which can improve our understanding of the lake circulation, wave dynamics, and their impact on sediment resuspension and vertical mixing in Lake Okeechobee. The data resulting from this study will be used to validate the Lake Okeechobee Environment Model which is used to predict the impacts of different management scenarios on lake activities.     

Superior–Subordinate Relationships in Korean Civil Engineering Companies

The Leader–Member Exchange (LMX) relationship quality between superiors and subordinates in Korean civil engineering companies were empirically examined for superiors’ feedback-seeking behaviors. The results showed that for superiors, affect, loyalty, and contribution toward subordinates were positively related to seeking negative as well as positive feedback from subordinates. From subordinates’ point of view, affect, contribution, and professional respect toward their superiors were positively related to superiors’ negative feedback seeking, but affect was negatively related to superiors’ positive feedback seeking. It was also found that superiors and subordinates were not consensual in LMX and superiors’ feedback-seeking behaviors. For example, for superiors, all of the four LMX dimensions were positively related to superiors’ asking subordinates directly for feedback, whereas for subordinates, none of the LMX dimensions were significantly related to superiors’ asking subordinates directly for feedback. These and other findings are discussed in detail, and implications for the findings are provided.