中国铜冶炼企业的竞争趋势及对策建议

文章分析了我国大型及中小型铜冶炼企业所面临竞争环境,提出了我国铜冶炼企业应采取的对策建议,即:联合进口原料;走大型企业联合之路,组建中国铜业集团;开发利用海外资源;加大国内资源勘探;继续进行技改、挖潜,提高企业竞争力等。     

On basic definitions of unified fracture mechanics terminology

The adoption of unified fracture mechanics terminology (UFMT) will promote efficient communication between specialists in different fields of fracture research, harmonization of national and international standards relating to fracture mechanics, and last but not least improvement of the existing methodology for teaching and education in fatigue and fracture. In this paper the definitions of some basic and related terms included in different standards on fracture mechanics terminology are confronted with one another. Alternative definitions of the same terms are offered. By this strategy the author tries to show that the definitions of basic and related terms appropriate for the UFMT should emerge as a consequence of harmonizing a crack model with an actual crack and then both taken together with a fracture model, laboratory test methods, and failure assessment codes.Published in Problemy Prochonsti, No. 1, pp. 17–29, January, 1996.This paper is published as a matter of discussion.     

Superconductivity and magnetism in niobium doped YBa2Cu3O7 Related high Tc ceramics

Magnetic characterization has been performed on the members of the cuprateniobate RBa₂Cu₂NbO₈ (R = Pr, Nd, and La) series and R_1.5Ce_0.5Sr₂Cu₂NbO₁₀ (R = Pr, Eu, Nd, and Sm) series. The PrBCNO samples show a signature in the magnetization of a magnetic ordering at 12K. The PrCSCNO sample is nonsuperconducting and shows two distinct orderings at 17K and 53K. No such magnetic phase transition is observed down to 2K in the Nd and La based RBCNO materials or the Nd, Sm, and Eu based RCSCNO materials. Measurements of the lower critical field curve, dc irreversibility line, and critical curent densities are reported for each of the superconducting NdCSCNO, SmCSCNO, and EuCSCNO compounds.     

巧用心理暗示提升高校图书馆服务质量

心理暗示是用含蓄、间接的方法,在无对抗的条件下,对人的心理和行为产生影响的过程。在高校图书馆的读者服务工作中,馆员们若能遵循目的性、权威性等原则,灵活掌握和运用言语暗示、行为暗示、环境暗示等方法,就能更好地利用心理暗示的积极作用,提升服务质量。     

建立实施职业健康安全管理体系迎接入世挑战

建立和实施职业健康安全管理体系 (OHSMS) ,改善职工健康状况 ,改善劳动条件已成为刻不容缓的任务。介绍了柳钢职业健康安全管理体系的建立和实施情况 ,并提出了建立文化OHSMS和QMS整合型管理体系的设想及建立整合型管理体系应注意的问题。     

《中华人民共和国煤炭法》亟待修订

当前,由于《煤炭法》颁布的时代背景发生很大变化,该法已经不能适应形势发展和实际工作的需要。该法存在的主要问题包括煤炭开采市场准入门槛设置过低、对煤炭生产开发规划规定过分原则等。我们应以科学发展观为指导,按照市场经济规律的要求,针对存在的问题尽快对《煤炭法》进行修订和完善。     

Anaerobic digestion of alkaline black liquor using an up-flow anaerobic sludge blanket reactor

The anaerobic digestion of alkaline black liquor from a cereal straw pulping mill was studied in batch (serum bottles) and continuous systems (up-flow anaerobic sludge blanket reactor—UASB). The batch digestion studies confirmed that lignin and related compounds (LRC) in the alkaline black liquor were the main inhibitory substances and could not be decomposed by anaerobic bacteria. At organic loading rates of 5–10 kg COD m^?3 day^?1, the UASB reactor achieved 50–60% COD removal efficiencies. Gas production was 2–3 dm³ per dm³ of alkaline black liquor. Two different sludge types were examined in the reactor: granular and cluster-like sludges. Sludge in a cluster, which involved many small granules and flocs, tended to form larger aggregates and possessed good settling ability.     

中国石化集团原油资源优化配置及建议

介绍了石化集团原油资源现状，分析了原油资源配置过程中存在的主要问题，提出了资源优化配置的原则与基本思路，及实施原油资源优化配置的配套措施和建议。     

磷酸西格列汀制剂中有关物质的合成

摘要：以西格列汀为原料依次富马酸二甲酯和马来酸酐分别经氮杂迈克尔加成和胺化反应制备相应西格列汀有关物质：①以西格列汀和富马酸二甲酯为原料，在DBU催化剂作用下，在N2保护下25℃搅拌6小时，经氢氧化锂，用乙酸乙酯-盐酸调节pH后，水相析晶体系分离提纯，得到西格列汀加合物有关物质I，HPLC纯度大于99%，收率76%；②以马来酸酐为原料，在K2CO3催化作用下，室温搅拌2小时，经一步法胺解开环反应制备西格列汀有关物质II，收率97%。本方法路线短，能耗低，生产成本低，操作简单，两种西格列汀有关物质收率好纯度高，适合工业化生产。     

国内外天然气化工产品发展方案探讨

阐述了国内外天然气化工产品的生产现状和发展趋势，从传统天然气化工产品中规划出乙酸乙烯、聚氯乙烯、甲醇等3个产品链方案，并分别对其产品方案及规模、产品市场、投资估算、主要技术经济指标等进行了分析，提出了当前我国发展天然气化工存在的问题和建议。