中国含稀土废物辨识及其稀土含量检测分析

对中国稀土产业链各个环节产生的含稀土废物进行辨识,并对其稀土回收情况进行初步分析,筛选出了仍可能具有稀土回收价值的含稀土废物之后,对筛选出的废物进行采样、检测、分析,明确其稀土元素的种类和含量。结果表明,稀土原材料产品以及稀土深加工产品和功能性产品生产过程中产生的含稀土废物,稀土回收的空间已不大;仍具有稀土回收价值的主要是稀土产品使用后所产生的6类含稀土废物:废稀土磁材器件、废荧光粉、废稀土抛光粉、废FCC催化剂、废稀土玻璃和废稀土陶瓷。     

稀土固体废物的成因、成分分析及综合利用

根据稀土工业产业链实际情况,就产生批量固体废弃物的工艺过程及稀土材料进行了讨论,对稀土湿法冶金渣、电解渣、铁基稀土永磁材料、钴基稀土永磁材料、稀土贮氢材料、稀土抛光粉、稀土催化剂等固体废物的成因、生成量、成分分析及综合利用进行了综述,并对稀土固体废物的处理及管理提出了建议。     

稀土出口价格与稀土储备

稀土出口价格和稀土储备是稀土研究的两个重要问题.从稀土的应用价值、相对稀缺性、生产的环境代价以及稀土供给的垄断特征,分析我国稀土出口应该有一个比较高的价格;从供求关系、市场结构、储备特征、储备对需求弹性和供给弹性的影响,分析储备对稀土出口价格的影响方向和影响效果;从储备的作用和稀土产业的未来发展目标,提出稀土储备的主要目的和方式.研究结果表明：稀土出口所形成的市场结构使我们丧失了稀土出口的议价能力;稀土国家储备在短期会对稀土出口价格提升产生一定的效果,但长期效果有限;稀土储备的主要目的应该是促进稀土应用产业的发展,并以稀土原矿（稀土资源）储备为主.     

浅谈四川稀土产业状况

对四川氟碳铈稀土矿的特征进行简要阐述,对四川地区稀土资源整合、稀土企业的矿山开采、冶炼分离以及稀土应用情况进行分析,对目前中国稀土产业格局以及四川地区产业格局进行分析。最后根据四川稀土产业状况,结合国内外形势,提出四川稀土发展的建议。     

浅析稀土抛光粉产业的发展现状与前景

本文简要介绍了红粉与稀土抛光粉作为抛光材料的优缺点,比较深入地介绍了甘肃稀土集团有限责任公司稀土抛光粉产业的发展历史、产品规模、生产技术工艺特点,并对照分析了国内外其他稀土抛光粉生产企业的类似概况;针对不同抛光材料对稀土抛光粉质量要求的不同,从稀土抛光粉的分类、稀土抛光粉的技术特性等方面进行了详细探讨。通过对国内外生产稀土抛光粉企业的产量规模以及应用行业的发展方向的分析,对甘肃稀土集团有限责任公司稀土抛光粉产业提出了发展方向,展望了未来。     

PVC塑料稀土复合热稳定剂的研制

本文制备了柠檬酸稀土、月桂酸稀土、硬脂酸稀土和苹果酸稀土,对各稀土产品进行了热稳定性研究,发现苹果酸稀土的热稳定性最好,其长期热稳定性与有机锡相当。并用苹果酸稀土与硬脂酸锌进行复配,发现具有很好的协同效应。     

世界稀土资源供需现状与中国产业政策研究

稀土资源已经成为世界现代工业化建设中不可或缺的因素,有着重要的战略价值.根据世界稀土资源的分布现状及世界稀土资源的供求状况,并结合我国稀土资源开采利用中存在的盲目滥采、落后开采、生态环境破坏严重、稀土产品深加工和后处理工艺技术水平低等问题,分析了我国进行稀土资源调控的政策方向,即建立稀土资源国家战略储备机制、建立并健全稀土期货交易市场、加强稀土产业政策的执行力度、谨慎制订稀土出口配额以及对稀土勘探、开采、分离、冶炼、深加工以及出口等设立专题分别进行重点研究与攻关,对我国未来稀土产业健康发展具有重要意义.      

世界稀土供应趋势分析

对国内外稀土储量变化和稀土矿产品、稀土冶炼分离产品、稀土新材料产品供应的长时间序列数据,进行了系统的分析。研究了世界稀土供应变化趋势,研究了我国稀土生产管理政策以及对我国的稀土价格和稀土产量变化的影响。通过定量和定性分析,认为近年来世界范围内稀土供应国家将逐渐增加,中国稀土供应量占世界比例将下降,世界稀土矿产品的供应将呈现多元化的供应格局与趋势。     

中国稀土资源整合政策对市场的影响分析

中国在WTO稀土、钨、钼相关产品出口管理措施案败诉后,组建大集团全面整合国内的稀土矿山资源和冶炼分离企业,把稀土综合利用项目纳入生产总量控制的计划管理迫在眉睫。中国稀土资源分布具有区域特征,决定了稀土产品的生产区域性。在中国政府整合稀土资源过程中,目前在稀土矿开采、冶炼分离产业基本形成六大集团绝对控制的局面。但存在中央、地方和企业之间的利益博弈,非法开采、产能过剩和走私等问题。稀土黑色产业链对稀土市场的产量和价格造成冲击,破坏环境和国家产业政策。在分析国外稀土分布和产能、成本后,中国廉价稀土对国外稀土企业的生产影响甚大。中国稀土政策与企业利益的博弈是影响稀土市场和价格的主要因素。     

全国稀土应用规划会在京召开

1986年3月7日在北京召开了“七五”期间全国稀土应用规划会议,进一步推广了稀土在各方面的应用,包括工业、农业、医疗卫生等方面。我国的稀土资源十分丰富,但目前还远远未被开发利用。我国应用稀土主要在如下几方面进行了较多的研究。稀土在铸铁中的应用,如钢锭模、暖气片等。稀土对人体的影响,即稀土在医疗方面的作用研究也较多,但对稀土在铜中的应用研究还很少,稀土对钢的强度和韧性的影响及其机理几乎还是未知数。有些单位对稀土加入钢中的工艺方法及其复合稀土合金应用等方法作了些工作。有人认为在炼钢中用稀土粉代替钙粉更经济;包头已成立了稀土冶金开发公司,并可生产一些稀土产品。     

Three-dimensional model of the fibrin(ogen) molecule and fibrin fibril

The paper deals with the three-dimensional model of fibrin(ogen) molecule and fibrin fibril, based on the electron microscopy data on fibrin(ogen) molecule and on fibrin fibril structure, data on symmetry of fibrinogen primary structure, on domain structure of molecule, on location of sites of polymerization and on the data on polymerization mechanism of fibrin.     

A meta-analytic study of social desirability distortion in computer-administered questionnaires, traditional questionnaires, and interviews.

A meta-analysis of social desirability distortion compared computer questionnaires with traditional paper-and-pencil questionnaires and face-to-face interviews in 61 studies (1967–1997; 673 effect sizes). Controlling for correlated observations, a near-zero overall effect size was obtained for computer versus paper-and-pencil questionnaires. With moderators, there was less distortion on computerized measures of social desirability responding than on the paper-and-pencil measures, especially when respondents were alone and could backtrack. There was more distortion on the computer on other scales, but distortion was small when respondents were alone, anonymous, and could backtrack. There was less distortion on computerized versions of interviews than on face-to-face interviews. Research is needed on nonlinear patterns of distortion, and on the effects of context and interface on privacy perceptions and on responses to sensitive questions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Proliferation and differentiation of human trabecular osteoblastic cells on hydroxyapatite

In order to evaluate whether human osteoblastic cells differentiate normally on hydroxyapatite, we have compared the adhesion, proliferation, and differentiation of human trabecular (HT) osteoblastic cells on synthetic-dense hydroxyapatite and on standard plastic culture. We show here that initial HT cell attachment was 4-fold lower on hydroxyapatite than on plastic after 4 h of culture, and that normal cell attachment on hydroxyapatite was restored after 18 h of culture. HT cell proliferation was similar on the two substrates at 2-8 days of culture, but was lower on hydroxyapatite compared to plastic after 15 and 28 days of culture, as evaluated by DNA synthesis or cell number. HT cells cultured on both substrates produced an abundant extracellular matrix which immunostained for Type I collagen. The levels of carboxyterminal propeptide of Type I procollagen (P1CP) in the medium were lower in HT cell cultures on hydroxyapatite than on plastic. In addition, (3H)-proline incorporation into matrix proteins and the mean thickness of matrix layers were 52% and 26% lower, respectively, on hydroxyapatite compared to plastic after 4 weeks of culture, indicating that the total collagenous matrix synthesized by HT cells was lower on hydroxyapatite. However, (3H)-proline and calcium uptake expressed per cell was higher on hydroxyapatite than on plastic. The results show that human osteoblastic cells attach, proliferate, and differentiate on dense hydroxyapatite with a sequence similar to that of plastic. However, the growth of human osteoblastic cells is lower on hydroxyapatite in long-term culture, which results in a reduced amount of extracellular matrix, although matrix production per cell may be increased.     

Expression of HLA-ABC and -DR locus antigens on human kidney, endothelial, tubular and glomerular cells

The distribution of the major histocompatibility complex antigens on the various cellular structures of the human kidney was analysed by using a modified Staphylococcus aureus Cowan 1 method. Conventional alloantisera and heterologous antisera raised against isolated molecules were used for the HLA-ABC antigens, whereas the HLA-DR (Ia) antigens were detected with heterologous antisera only. The HLA-ABC antigens were expressed on all types of kidney passenger leucocytes, on vascular endothelial cells, and on kidney tubular cells, but not substantially on the glomerular podocytes. The DR antigens were strongly expressed on (a fraction of) the passenger lymphocytes and on the kidney vascular endothelial cells, weakly on the passenger monocytes, but not measurably on the urine-producing apparatus of the kidney--that is, on the glomerular and tubular cells.     

Oxidative stress is found in amyloid deposits in systemic amyloidosis

PURPOSE: To investigate a method of diagnosing angiomyolipoma that contains minimal fat. MATERIALS AND METHODS: In six cases of angiomyolipoma with minimal fat, the attenuation on contrast material-enhanced and unenhanced computed tomographic (CT) images, the echogenicity on sonograms, the signal intensity on T2-weighted magnetic resonance (MR) images, and the gross configuration of the lesion were retrospectively analyzed. In 100 cases of renal cell carcinoma, the same parameters were analyzed, and results were compared with those of angiomyolipoma. RESULTS: When compared with the surrounding renal parenchyma, all six angiomyolipomas showed homogeneously high attenuation on unenhanced CT images, homogeneous enhancement on contrast-enhanced CT images, and homogeneous isoechogenicity on sonograms. Of the five angiomyolipomas examined with MR imaging, four were hypointense and one was isointense on T2-weighted images. All six angiomyolipomas protruded from the renal margin. None of the 100 renal cell carcinomas showed homogeneously high attenuation on unenhanced CT images, homogeneous enhancement on contrast-enhanced CT images, or homogeneous isoechogenicity on sonograms. CONCLUSION: In the kidney, homogeneously high attenuation on unenhanced CT images, homogeneous enhancement on contrast-enhanced CT images, and homogeneous isoechogenicity on sonograms are suggestive of angiomyolipoma that contains abundant muscle and minimal fat.     

丹宁酸对锌电解电流效率的影响

对存在于硫酸锌溶液中的丹宁酸有机物对锌电解电流效率的影响进行了试验研究,结合生产实际对建矿以来工业生产中有关锌电解电流效率的相关数据进行分析,认为存在于硫酸锌溶液中的丹宁酸有机物极易在氧化介质和高温环境中被破坏除去,不会对锌电解造成危害和降低锌电解电流效率。     

炼钢厂生产管理信息系统的设计与实现

炼钢厂生产管理信息系统包括制造命令管理子系统、生产辅助管理子系统和工艺质量管理子系统.本文从软件工程理论出发,围绕数据库应用系统的开发,结合制造命令管理子系统的具体实现,主要介绍了生产管理系统在Oracle Developer中的设计思想及开发方法.     

Effects of ionizing radiation on cartilage: emphasis on effects on the extracellular matrix

In this report, we review data dealing with radiation effects on cartilage. More specifically, we emphasize on alterations caused in the extra-cellular cartilage matrix. Although radiation studies predominantly describe the effect on the structure of DNA and on the mitotic activity of cells, alterations caused by the effect on the non-mitotic activity can also be important. Cartilage, having an extracellular matrix composed of 2 major components, aggrecan and collagen, provides a good model to study this kind of radiation effects. The following topics concerning literature data are summarized: effects on the amount of matrix synthesized, effects on the activity of certain enzymes and effects on the structure and morphology of the matrix. Some new findings concerning the radiation effect on the size distribution of aggrecan-aggregate populations, de novo synthesized by chondrocyte cultures, either derived from calcifying or from non-calcifying cartilage, are given.     

Highlights of the annual meeting of the International Society for the Advancement of Respiratory Psychophysiology and the 14th International Symposium on Respiratory Psychophysiology

This article provides a review of selected presentations and events that highlighted the annual meeting of the International Society for the Advancement of Respiratory Psychophysiology (ISARP) and the 14th International Symposium on Respiratory Psychophysiology, Toronto, Ontario, Canada, October 1995. The meeting, which was scheduled as a satellite to the 35th annual meeting of the Society for Psychophysiological Research, included two workshops (Diana M. Innocenti on "Identification of Individual Breathing Patterns and Introduction to the Reeducation of Dysfunctional Patterns in Hyperventilation, Asthma, and Emphysema" and Richard N. Gevirtz on "Respiratory and Psychophysiological Factors in the Diagnosis and Treatment of Functional Cardiac and Panic Disorders"), two symposia (one on "Breathing Retraining: Issues and Applications" and one on "Capnography and Hyperventilatory Hemodynamics"), three invited addresses (Hans Folgering on "Rehabilitation of Patients with Exercise Hypoxemia"; David Stubbing on "Assessing Impairment, Disability, and Handicap in Chronic Lung Disease"; and Robert Banzett on "Hypercapnia-Induced Air Hunger"), three panel sessions (one on "Respiratory Psychophysiology of Airway Obstruction," one on "Applied Respiratory Psychophysiology," and one on "Hyperventilation and Panic: Psychological Aspects"), and a poster session.     

Delaying colostrum intake by one day has important effects on metabolic traits and on gastrointestinal and metabolic hormones in neonatal calves

Effects on metabolic and endocrine traits of feeding colostrum on d 1 and 2, then mature milk up to d 7, or glucose or water on d 1, colostrum on d 2 and 3 and then mature milk up to d 7 were studied in calves. Calves fed colostrum within the first 24 h after birth had significantly higher rectal temperatures, heart rates and respiratory frequencies than calves provided only water or glucose. Significantly elevated plasma nonesterified fatty acid and bilirubin concentrations on d 1 and 2 of life in calves fed only water on d 1 compared with calves of the other groups mirrored reduced energy intake. Fecal consistency was significantly higher during wk 1 of life, and gastrin and glucose-dependent insulinotropic polypeptide increased only on d 1 and/or 2 of life in calves already fed colostrum on d 1, expressing improved functioning of the gastrointestinal tract. Significantly higher plasma globulin levels up to d 7 in calves fed colostrum on d 1 than in those starting colostrum intake only on d 2 demonstrated significantly enhanced efficiency of gamma-globulin absorption. Furthermore, significantly higher circulating glucose, albumin, insulin, insulin-like growth factor-I concentrations and significantly lower urea levels in calves fed colostrum on d 1 compared with those fed colostrum starting on d 2 of life indicated stimulation of anabolic processes. In conclusion, colostrum intake by calves within the first 24 h of life is needed not only for an adequate immune status, but also to produce the additional important and favorable effects on metabolic and endocrine traits and on vitality.