世界再生金属生产现状与趋势

介绍了世界废钢铁、再生铝、再生铜、再生铅锌、再生贵金属等的生产现状,指出了再生金属产业的广阔前景。     

微波在吸附有机质活性炭再生中的应用

文中综述了在吸附有机质活性炭再生中的微波技术的应用现状,探讨了微波加热再生条件对再生活性炭吸附性能的影响,并对微波再生活性炭的机理进行了简单的阐述.文献表明,采用微波再生活性炭,具有再生时间短、再生效果好、能耗低等优点.一般情况下,直接对活性炭进行微波再生,再生后的活性炭吸附容量及比表面积有所下降,中孔增多,导致活性炭的平均孔径变大;如果采用活化剂对活性炭进行微波活化再生,可有效提高再生活性炭的吸附性能.     

离子交换器逆流再生技术浅析

逆流再生是一种离子交换技术,是相对于运行工艺而言的,即:再生工艺采用底部进再生液,增设中间排水装置,再生液同交换剂接触再生时,再生液可以充分发挥它们的作用。本文通过对离子交换器逆流再生技术与顺流再生技术的对比分析,验证了逆流再生工艺具有再生耗量低、自耗水量小、出水质量高、周期制水量大、对原水的选择适应性较大的特点。从而得出逆流再生工艺要比顺流式优越的结论。     

载金活性炭活化再生技术研究现状与进展

活性炭作为炭浸法/炭浆法的载金介质,在循环利用中需进行活化再生,以保持其吸附金的活性.从活性炭性质与金吸附原理出发,探讨了载金活性炭活性下降的主要机制.基于此,总结了活性炭活化再生常规技术,介绍了具有大规模应用前景的活化再生新技术,包括新型酸洗柱、超声强化酸洗、强制放电再生、微波再生、电热再生,简述了其作业机理、活化再...     

酸再生机组废气达标排放控制与对策

为了符合更加严格的环保要求,对酸再生机组容易出环保事故的关键点进行了分析。以酸再生焙烧炉废气温度、浓缩铁液杂质、酸再生废气HCl水平为重点,分析了故障原因。通过改进设备、调整工艺方法,保证了酸再生机组环保稳定性,并对酸再生的一些改进建议和操作方法进行了详细的介绍。     

浅谈再生铝回收及利用技术

从再生铝的分解与拆解技术、细分与提纯技术、废铝合金化技术、熔体纯净化技术、高性能再生铝产品加工技术5个方面分析了再生铝回收及利用技术的现状,提出了该技术所面临的问题,阐明了发展再生铝产业需开发的关键技术,并指出再生铝回收及利用技术的发展方向。     

我国废铝再生的意义、现状及对策

比较详细地介绍了铝再生在我国的重要意义。铝再生节约铝矿资源、节约能源、减少污染、经济效益好。本文还指出了当前我国铝再生的现状和存在的同题。提出了解决同题的一些对策．并对铝再生在我国的发展作了展望。     

国内再生金属行业上半年发展状况

上半年,中国再生金属行业继续保持了平稳的发展态势,再生铜、再生铝的产能、产量稳定增长。随着建设节约型社会和发展循环经济的观念不断深入人心,社会各界对再生金属产业的认识不断趋于客观,对再生金属产业的接纳程度也日益加大。     

国内外再生铅生产现状及发展趋势

本文阐述了国内外再生铅工业技术现状、产业政策、产量及区域分布情况,分析了发展我国再生铅工业的主要障碍,指出了国内外再生铅工业的发展趋势。     

除盐水系统再生工艺的改进

除盐水制水系统在增设了弱酸、弱碱离子交换器之后，原有的再生操作方法存在弊端，使离子交换器再生效果逐步变差，酸、碱耗较高。将原有再生方法改进成三步，不但满足了弱酸、弱碱离子交换器的再生需求，同时降低了酸碱耗。     

钢液连铸二次冷却先进工艺模型的发展与研究

 钢液连铸二次冷却的效果直接影响连铸坯质量,为了合理地控制二次冷却过程,多种静态和动态控制工艺模型被提出。系统综述了目前二冷静态和动态控制工艺模型的发展,包括二冷区各回路水量与拉速呈一次线性或二次曲线关系的二冷控制工艺模型、基于修正有效拉速的二冷动态控制工艺模型和基于在线传热计算的二冷动态控制工艺模型等,以及基于钢液过热度和二冷进水温度的二冷控制先进工艺模型和基于在线温度测量反馈调节各回路水量的二冷动态控制工艺模型。随着二冷控制工艺模型的发展,其控制的实时性、可靠性、准确性以及运行的稳定性也逐渐提高,从而为高质量铸坯生产及智能化二冷控制奠定了基础。     

板坯连铸二冷制度优化

应用二冷区铸坯表面温度测定和连铸坯硫印、低倍检验等方法，分析评价了攀钢板坯连铸现行二冷制度对铸坯内部质量的影响，并在此基础上优化完善了连铸二冷配水制度。结果表明，采用增大二次冷却强度、增加二冷段后区铸坯冷却能力的配水制度对减轻铸坯中心偏析、扩大铸坯等轴晶率、提高铸坯内部质量有明显效果，为进一步完善连铸二冷控制制度提供了坚实的技术基础。     

次级发射相关研究及应用的发展与现状

本文简述了次级发射的理论研究。次级发射理论在于研究影响次级发射的相关因素及对离子轰击下的次级发射现象的研究,以及对氧在金属表面的覆盖率与二次电子发射性能的关系的研究。介绍了几种成熟的有效次级发射体的性能研究、实际应用和与这些发射体相关的理论探讨。本文根据新型稀土钼热阴极材料发射理论研究成果,提出稀土钼次级发射材料研究的一些设想。     

Effect of Secondary Impacts on SPT Rod Energy and Sampler Penetration

This paper explores the standard penetration test (SPT) hammer-anvil behavior and investigates the effect of secondary impact on SPT energy and sampler penetration. It is observed that the hammer-anvil behavior after the impact depends on the characteristics of the wave reflected from the sampler. The type-I secondary impact, which is dominant for N<25, is induced due to the rapid downward movement of the anvil and the recontact of the following hammer on the rebounding anvil. The maximum energy calculated by integrating force and velocity (EFV) is achieved immediately after the occurrence of the type-I secondary impact and an additional sampler penetration is triggered by the type-I secondary impact. The type-II secondary impact, which is dominant for N>50, is produced by the restrike of the pushed-up hammer on the resting anvil. The type-II secondary impact causes only recoverable anvil deformation and does not contribute to the maximum EFV energy. For N-values of 25–50, both or either types of secondary impacts happen. As N-value increases, the type-I secondary impact fade away progressively and the type-II secondary impact becomes more distinctive.     

陕西寺沟铅锌矿新认识及潜力分析

寺沟-银洞梁背斜南翼次级褶皱非常发育,初步查明的次级褶皱就有四个,从北向南依次为北枝次级倒转向斜、北枝次级背斜、南枝次级向斜和南枝次级紧闭背斜,寺沟铅锌矿产在南枝次级紧闭背斜的南翼,是典型的背斜控矿,该背斜向西倾伏,西部仍有找矿潜力。该区褶皱发育,控矿的南枝次级紧闭褶皱相对非常紧闭,宽度小、高度低,不容易判断、识别,这就给深部找矿带来难度。用常规钻探探矿方法,准确探到南枝次级紧闭背斜(矿体)的几率较小,用钻探控制深部矿体一是要准确判断、预测深部背斜(矿体)位置;二是要从已知背斜(矿体)开始,沿矿体倾伏方向小间距向深推进。     

Factors associated with survival following secondary AIDS: 1988 to 1995

The second AIDS-defining condition diagnosed chronologically is referred to in this report as the secondary AIDS diagnosis. In this study, we examined survival following a secondary AIDS diagnosis using demographic and clinical factors known within 1 year before secondary AIDS diagnosis. In a prospective cohort of 2412 HIV-seropositive homosexual men observed in the Multicenter AIDS Cohort Study (MACS), 609 presented with a secondary AIDS diagnosis between January 1, 1988 and March 31, 1995. To analyze the data, we used survival analysis methods including the Kaplan-Meier product-limit estimator and extended Cox models that allow for nonproportional hazards. The median survival time after a secondary diagnosis was 10.3 months. Rapidity of progression from an initial AIDS diagnosis to a secondary diagnosis was not associated with survival. Drug treatment did not show a beneficial effect because of confounding by indication (i.e., selection bias) and limited efficacy on advanced disease of treatments available prior to 1995. However, a beneficial effect was captured by the use of calendar periods as a proxy measure for the relative exposure to drug treatments. Later calendar year of secondary diagnosis, secondary Kaposi's sarcoma, and higher CD4+ cell count were found to be significantly (p < .05) associated with longer survival time. However, secondary AIDS diagnosis was a significant factor only in the short term. Using secondary Pneumocystis carinii pneumonia as the reference diagnosis, the relative hazard of death 3 months after the time of secondary Kaposi's sarcoma diagnosis was 0.56 (95% confidence interval [CI] = 0.36-0.89) whereas the relative hazard after concurrently diagnosed multiple secondary illnesses was 2.06 (95% CI = 1.26-3.38). After approximately 1 year from the secondary diagnosis, the type of diagnosis was no longer significantly associated with survival.     

Automatic stimulus–response translation in dual-task performance.

In bottleneck models of overlapping-task performance, stimulus-response translation for secondary tasks is postponed until the primary response is selected. If this is so, then compatibility between the secondary and primary responses, or between the secondary response and the primary stimulus, should not affect primary-task performance. Yet such effects were demonstrated in 5 dual-task experiments combining primary manual and secondary vocal tasks: Pronounced effects of compatibility between the secondary and primary response and between the secondary response and primary stimulus were found on primary-task performance. The latter effect was also found with the lowest level of an extensive stimulus onset asynchrony variation, when the secondary task was not speeded, and even when the 2 tasks were performed on different trials. Findings suggest that secondary responses were activated before primary response selection was completed and thus support an automatic-translation hypothesis holding that, although eventual response selection may be serial, stimulus-response translation is performed in parallel. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

城镇二次供水污染过程分析及对策

本文分析了二次供水的现状，指出二次供水卫生污染的主要污染源是贮水箱(池)，并分析了贮水箱(池)受污染的原因。通过对二次供水消毒各种方法的优缺点进行评价，提出适合我国二次供水消毒的方法和防止二次供水卫生污染的对策。     

Coincidence grain boundary and role of inhibitor for secondary recrystallization in Fe-3% Si alloy

Secondary recrystallization behavior in the presence of AlN and MnS precipitates in Fe-3% Si alloy, processed by one stage cold rolling method, was investigated with special reference to a role of inhibitor for secondary recrystallization. The sharpness of Goss secondary texture is higher in the early stage of secondary recrystallization. In the case of stronger grain growth inhibition by precipitates during secondary recrystallization, the evolution of secondary recrystallized grains in orientations dispersed from Goss orientation is smaller than that in the case of weaker grain growth inhibition. The mechanism of these experimental results is explained by the specific grain boundary migration characteristics in the presence of inhibitor, namely, the critical frequency of Σ9 coincidence oriented grains in relation to nucleus for the evolution of secondary recrystallization is considered to be higher in the case of stronger grain growth inhibition during secondary recrystallization.