无螺栓衬板材料及工艺研究

本文通过生产实践研究分析，优选出一种合适氧化铝矿球磨机无螺栓种板特殊工矿条件具有优良耐磨耐冲击抗腐蚀性强的合金材料；并对其铸造工艺及热处理工艺进行研究优化，最终得到质量可靠、性能优良的产品。     

大型球磨机衬板材质和热处理工艺的研究

在不增加贵重合金元素的前提下,设计的中碳钢SiCrMnMo成分具有足够的淬透性和淬硬性,经中温回火处理,具有硬度和韧性的良好配合.经试验,在有效厚度超过110mm、重约700kg的大型球磨机衬板上实际应用,耐磨性明显提高.     

提高球磨机衬板耐用性的研究

高锰钢衬板初始硬度低，在球磨机的工况条件下不能充分发挥工作硬化效应。针对这种情况研制了ＺＧ６０ＭｎＣｒ３合金衬板，该衬板具有较高的初始硬度与较强的硬化能力，且耐磨性高，经工业应用表明：使用寿命比ＺＧＭｎ１３衬板提高４３．４５％。     

双金属复合球磨机衬板投产

双金属复合球磨机衬板投产江都市电力器材总厂针对国内球磨机衬板耐磨性差、易变形且无法与硬度高的磨球匹配使用的缺点，应用专利技术成果，在国内率先研制生产成功立浇双金属复合球磨机衬板，填补了国内一项空白，于最近通过了电力部电力机械局组织的新产品鉴定，并投入...     

矿用球磨机复合铸造衬板的结构分析

本文介绍了矿用球磨机复合铸造衬板的结构形式,同时简述了矿用球磨机双金属复合铸造衬板结构失效形式,并对矿用球磨机复合铸造衬板结构工艺做了一定的研究。该矿用球磨机复合铸造衬板兼具多种衬板的优点,既有较高的耐磨性和使用寿命,又有良好的整体韧性,在矿用球磨机上非常适合使用。     

中碳低铬多元合金衬板的研究

中碳低铬多元合金钢是一种综合性能较好的耐磨材料，经热处理后的金相组织为隐针马氏体＋下贝氏体＋少量残余奥低体，硬度ＨＲＣ５３－５７，冲击功为８０Ｊ，耐磨性是ＺＧＭｎ１３的３倍，将其用在球磨机衬板等铸件上，具有很大的推广价值。     

中碳低铬多元合金钢衬板的研究

中碳低铬多元合金钢是一种综合性能较好的耐磨材料，经热处理后的金相组织为隐针马氏体十下国氏体十少量残余奥氏体，硬度ＨＲＣ５３～５７，冲击功为８０Ｊ，耐磨性是ＺＧＭｎ１３的３倍，将其用在球磨机材板等铸件上，具有很大的推广价值。     

对球磨机衬板选材的一点看法

球磨机是选矿工业中的主要设备。为了保护球磨机筒体内表面不受磨损和控制钢球在简体内的运动轧迹，筒体内铺有高锰钢衬板。主要介绍球磨机衬板装在不同部位，应选不同材质的衬板。     

济钢一炼铁厂球磨机衬板的改进

1 引言 济钢一炼铁厂现在使用的3台球磨机中,2台为250/390型,1台为290/410型。在检修中发现,球磨机原筒体上所用衬板为ZG13Mn材质,在高温180～250℃的工作     

关于球磨机推广使用橡胶衬板的建议

本文详细阐述了橡胶衬板的种种性能、特点及其在球磨机中使用的情况,从各方面提出了推广使用橡胶衬板的必要性.     

论废旧电子线路板的资源化回收利用

电子工业迅猛发展,如何有效回收利用废旧电子线路板已成为一个新课题。文章就电子线路板回收的意义、现状及方法进行了探讨,以期废旧电子线路板资源化回收利用能步入良性发展轨道。     

The virtual cutting edge: The Internet and adolescent self-injury.

The 2 studies reported here use observational data from message boards to investigate how adolescents solicit and share information related to self-injurious behavior. Study 1 examines the prevalence and nature of these message boards, their users, and most commonly discussed topics. Study 2 was intended to explore the correlations between content areas raised for discussion. Both studies were intended to shed light on the role of message boards in spreading information about self-injurious practices and influencing help-seeking behavior. More than 400 self-injury message boards were identified. Most are populated by females who describe themselves as between 12 and 20 years of age. Findings show that online interactions clearly provide essential social support for otherwise isolated adolescents, but they may also normalize and encourage self-injurious behavior and add potentially lethal behaviors to the repertoire of established adolescent self-injurers and those exploring identity options. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Psychology and mental health advisory councils: Where do we stand?

The Division of Psychologists in Public Service of the Maryland Psychological Association established a task force to study the underrepresentation of psychologists on mental health advisory boards. Chairpersons of 35 boards responded to a survey. Results corroborate psychology's underrepresentation but indicate (1) that those boards responding to the survey that had previously worked with psychologists were overwhelmingly positive about the experience and (2) that most boards welcome involvement by psychologists. (0 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

废旧电脑印刷电路板的热解特性及动力学分析

为了分析废旧电脑印刷电路板热解过程中的反应机理,研究废旧电脑印刷电路板(DN)在常规热解条件下的升温特性和热解动力学.研究发现,DN粉末主要的质量损失发生在热解温度为553～773 K时的有机物分解阶段,且可分为主要热解和残渣分解两个过程,其相应的平均活化能分别为137.12 kJ/mol和31.31 kJ/mol.通...     

MAP法和折点氯化法联合工艺处理印制线路板铜氨废水试验研究

在废印刷电路板回收利用时通常会产生大量含重金属离子的废水,一般含有[Cu（NH₃）₄]2+、NH₄+和NH₃·H₂O,这些铜氨络离子稳定性高,处理难度极高。文中以废印刷电路板在回收利用有价金属时产生的铜氨废水为研究对象,通过MAP法和折点氯化法联合工艺对该废水进行处理,有效回收了氨氮和铜。该联合工艺不仅可以有效地节约经济成本,并且回收的铜和氨氮产物也能产生一定的经济效益。结果表明:MAP反应的较优条件为pH=9.5,废水中氨氮与投入磷盐和镁盐的摩尔比为4:1:1.1,对氨氮的去除率为23%,铜的去除率为2%,形成了磷酸氨镁沉淀。折点氯化法的较优pH为9.5,N/Cl的摩尔比为1:1.6,氨氮处理效果为98.8%,铜去除率99.8%。      

废弃线路板中金属循环利用技术研究进展

废弃线路板是废弃电子产品的核心部件,其主要由贵金属、有色金属、重金属、溴化阻燃剂和树脂等组成。废弃线路板内金属的循环利用不仅有利于实现资源循环,还能降低其对环境产生的危害。概述了从废弃线路板中回收金属的技术,包括机械处理技术、火法冶金技术、湿法冶金技术及生物冶金技术,并对不同技术的优缺点进行了分析;生物冶金技术处理废弃线路板具有良好的应用前景,有望实现工业化应用,为废弃线路板低成本、环保、高效循环利用提供保障,解决了废弃线路板循环利用过程中存在的潜在风险。     

电感耦合等离子体原子发射光谱法测定废旧线路板中砷锑铋锡镍铅铟银镧铈钆钇

采用硝酸和盐酸溶解样品, 电感耦合等离子体原子发射光谱法(ICP-AES)测定了废旧线路板中砷、锑、铋、锡、镍、铅、铟、银、镧、铈、钆和钇12种元素。对硝酸和盐酸的用量、分析谱线的选择、基体的影响和仪器参数等进行了研究, 确定了实验的最佳测定条件。通过加标回收试验和采用电感耦合等离子体质谱(ICP-MS)法进行对照分析, 验证了方法的可靠性和准确性。试验表明, 方法适用于废旧线路板中砷、锑、铋、锡、镍、铅、铟、银、镧、铈、钆和钇的测定。方法的检出限(3s)为0.000 9~0.04 μg/mL, 测定样品的相对标准偏差(n=5)在0.58%~4.6%之间, 加标回收率在85%~104%范围。     

Development of a model for evaluation of microbial cross-contamination in the kitchen

Foods can become contaminated with pathogenic microorganisms from hands, the cutting board, and knives during preparation in the kitchen. A laboratory model was developed to determine occurrence of cross-contamination and efficacy of decontamination procedures in kitchen food-handling practices. Enterobacter aerogenes B199A, an indicator bacterium with attachment characteristics similar to that of Salmonella spp., was used. Chicken meat with skin inoculated with 10(6) CFU of E. aerogenes B199A/g was cut into small pieces on a sterile cutting board. The extent of cross-contamination occurring from meat to the cutting board and from the cutting board to vegetables (lettuce and cucumbers) subsequently cut on the board was determined. Swab samples from the cutting board, hand washings, and lettuce and cucumber samples revealed that approximately 10(5) CFU of E. aerogenes/cm2 were transferred to the board and hands and approximately 10(3) to 10(4) CFU of E. aerogenes/g to the lettuce and cucumbers. The surfaces of the cutting board and hands were treated with antibacterial agents after cutting the meat, and counts of E. aerogenes on the cutting board and vegetables (lettuce and cucumbers) were determined. Results revealed that use of the disinfectant reduced the population of E. aerogenes to almost nondetectable levels on the cutting boards. The average counts after treatment were < 20 CFU/g of vegetable and ranged from < 20 to 200 CFU per cm2 or g on the cutting board and subsequently on the vegetables. These results indicate that bacteria with attachment characteristics similar to Salmonella spp. can be readily transferred to cutting boards during food preparation and then cross-contaminate fresh vegetables if the boards are not cleaned. Application of a kitchen disinfectant can greatly reduce bacterial contamination on cutting boards.     

冷轧平整板形控制工艺探讨

介绍了平整过程中影响板形缺陷的因素,提出了解决平整过程中板形缺陷的主要因素是轧辊的辊型控制,并分析指出了生产实际中可通过合适的原始辊型凸度、调整液压弯辊装置、倾斜轧辊以及调节轧制压力和带钢张力来改善平整板形的控制方法。     

Psychology and the courts: Some implications of recent judicial decisions for state licensing boards.

Licensing boards for psychologists are increasingly being subjected to court challenges of their decisions. This article reviews several recent judicial decisions concerning licensing boards and the issues of eligibility for licensure, evaluation of candidates for licensure, and enforcement of licensing laws. The outcome in nearly all of the cases was primarily determined by the degree to which licensing boards adhered to principles of due process. Implications of these findings for the administration of boards, particularly in the area of rules and regulations, are discussed. (5 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)