Ф410离心复合铸铁轧辊结合层不良的成因及控制

从铸造工艺和实际操作对Ф410离心复合轧辊结合层质量的成因进行了全面分析,结果表明,原工艺玻璃渣的加入量、填芯速度均存在一定的问题;同时扒渣不尽也是重要原因;并提出控制措施,为提高轧辊质量、解决轧辊复合层结合不良的技术难题提供了重要依据。     

电解铝液生产大尺寸扁锭工艺技术研究

针对目前国内铝合金铸锭存在的质量问题进行了分析,总结了电解铝液生产工艺的铸造工艺及熔炼工艺的注意要点,并就冷却强度、铸造速度、铸造温度以及结晶器液面高度等相关工艺参数的优化控制,提出了几点建议。     

方型钢锭模凝固进程的数值模拟及铸造工艺的改进

对鞍钢Zx8.3t高炉铁水钢锭模的现行工艺进行了模拟计算分析,实测了钢锭模凝固时的温度场,提出了四种铸造工艺改进方案。结果表明,在钢锭模底部加一冷铁,显著地改变了钢锭模的凝固进程,消除了原铸造工艺在钢锭模围带处的缩孔缺陷,提高了钢锭模的铸造质量。     

烧结机热筛板盲孔的消除方法

针对攀钢烧结机热筛板铸造过程中出现的盲孔问题，将原工艺的单边泥芯头改进为Ｚ字型泥芯，解决了盲孔问题，收到了较好的效果。     

20kg铝锭连续铸造机自动堆垛系统的改进

针对20kg铝锭连续铸造机原控制系统存在的问题,介绍改进情况。     

低压铸造法制备铝基复合材料的研究现状

低压铸造工艺是一种近净成型技术,在金属基复合材料制备中具有广泛的应用和发展前景。概述了目前利用低压铸造技术制备铝基复合材料的研究进展,重点阐述了复合材料的充型基本理论和铸造工艺研究中存在的问题,并提出了今后需要重点研究的方向。     

大直径铝合金活塞的模具设计和铸造工艺优化

大直径铝合金活塞的模具设计是工业生产制造中研究的重点。本文以原铸造工艺为基础,借助铸造凝固模拟分析软件对铸造工艺进行分析,数值模拟大直径铝活塞毛坯铸件的浇筑及凝固过程,在数值模拟的过程中对铸件可能产生铸造缺陷的部位进行预测。结合相应的模拟结果进一步改进和优化原有的铸造工艺和模具结构,结果证实改造后的铸造工艺和模具结构模拟效果更高,在实际生产中可明显提升铸件质量,将活塞试制周期明显缩短,避免产生大量的试制成本,起到优化产生性能的目的。     

汽室涨圈的离心铸造

针对砂型铸汽室涨圈存在的问题,采用离心铸造生产汽室涨圈。离心铸造汽室涨圈的工艺参数、浇注工艺和热处理工艺的分析以及生产实际表明,其生产工艺可行、铸件成品率高、质量可以保证。     

铸造铝合金方棒浇铸质量控制与应用

针对热顶模半连续铸造铝合金方棒存在的工艺技术及产品质量缺陷问题，分析了生产中产生问题的原因，研发了方棒铸造用结晶器成型技术，采取了操作强化、工艺控制、技术升级、工装维护等具体措施，使生产率提升到17 t/h，铸造成材率提升到99.5%，产品质量良好。     

一种铸造铝合金用水溶性易溃散二氧化碳自硬砂的研究

目前,内蒙古地区的铸造加工企业生产铝合金铸件时,一般用呋喃树脂砂,酚醛树脂砂或覆膜砂制备砂型和砂芯。树脂砂铸造生产存在较多的问题。针对这一情况,采用新型的型砂粘结剂及新的混制工艺,研发了一种铸造铝合金用水溶性易溃散二氧化碳自硬砂。     

铝电解铸造保温炉采用天然气加热的节能分析

通过对铝电解铸造保温炉前后两种加热方式的比较，得出采用天然气加热的优越性，同时，采用先进技术对其进行实时控制，具有控制精度高、安全可靠的优点。     

把金堆城钼业公司培育成世界级跨国公司

提高钼产品质量、创建JDC品牌 ,研发拥有自己知识产权的新产品、新技术和新设备 ,引进高级技术人才与管理人才 ,把金堆城钼业公司培育成世界级跨国公司     

Evidence for involvement of Bax and p53, but not caspases, in radiation-induced cell death of cultured postnatal hippocampal neurons

This paper unfolds the events, the people and the times that led up to the founding of AChemS and fashioned its character during its early formative years. It describes the path over which AChemS came, going from the original assertions and denials for the need of such an organization to its later inception and nascent development. This narration highlights such topics as the debate over the need for AChemS, the role of National Science Foundation in the founding of AChemS, the derivation of the Association's name, the choice of Sarasota and the Hyatt House as the meeting site, the generation of the programs for the early annual meetings, the adoption of the bylaws, the process of incorporation and tax deferment, and the birth of the Givaudan Lectureship. Most emphatically highlighted, however, is the enthusiasm, commitment and hard work that the members of the chemosensory research community displayed in bringing AChemS to fruition.     

mtDNA haplogroup X: An ancient link between Europe/Western Asia and North America?

On the basis of comprehensive RFLP analysis, it has been inferred that approximately 97% of Native American mtDNAs belong to one of four major founding mtDNA lineages, designated haplogroups "A"-"D." It has been proposed that a fifth mtDNA haplogroup (haplogroup X) represents a minor founding lineage in Native Americans. Unlike haplogroups A-D, haplogroup X is also found at low frequencies in modern European populations. To investigate the origins, diversity, and continental relationships of this haplogroup, we performed mtDNA high-resolution RFLP and complete control region (CR) sequence analysis on 22 putative Native American haplogroup X and 14 putative European haplogroup X mtDNAs. The results identified a consensus haplogroup X motif that characterizes our European and Native American samples. Among Native Americans, haplogroup X appears to be essentially restricted to northern Amerindian groups, including the Ojibwa, the Nuu-Chah-Nulth, the Sioux, and the Yakima, although we also observed this haplogroup in the Na-Dene-speaking Navajo. Median network analysis indicated that European and Native American haplogroup X mtDNAs, although distinct, nevertheless are distantly related to each other. Time estimates for the arrival of X in North America are 12,000-36,000 years ago, depending on the number of assumed founders, thus supporting the conclusion that the peoples harboring haplogroup X were among the original founders of Native American populations. To date, haplogroup X has not been unambiguously identified in Asia, raising the possibility that some Native American founders were of Caucasian ancestry.     

Uncertainties in Geologic Profiles versus Variability in Pile Founding Depth

How the design and actual founding depths of foundations correspond to the variability of geological conditions has long been a concern. This paper evaluates the spatial variability characteristics of as-built and estimated founding depths of driven steel H piles with reference to the spatial variability characteristics of geologic profiles at a weathered soil site in Hong Kong. Spatial variability characteristics are evaluated in terms of variance and scale of fluctuation. The variability of three founding depth indicators, i.e., the depth of Grade-III bedrock, the depth of standard penetration test blow count “N” of 200 blows/0.3 m (SPT-200), and the depth of completely decomposed granite over the site was estimated. It is found that pile founding depths exhibit greater variations than those of the geologic profiles due to the presence of design model errors, judgment errors, and construction effects. The as-built founding depths are mostly between the SPT-200 profile and the Grade-III bedrock profile. The variances of as-built pile length are similar to those with depth of SPT-200 but less than those with depth of Grade-III bedrock. The scale of fluctuation of as-built pile length is on the order of 20 m when kriging is used and 10 m when kriging is not used, which are less than those with depths of SPT-200 and Grade-III bedrock.     

18AVRFR-2型全自动膨胀仪的改造

利用计算机、传感器和控制技术完成18AVRFR-2型全自动高温膨胀仪测试数据的测量、采集及处理系统的改造,恢复了设备原有功能。     

Translarnygeal tracheostomy (TLT). A variant technique for use in hypoxemic conditions and in the difficult airway

AIM: To prepare a variation to the original Fantoni technique for the purpose of performing a translaryngeal tracheostomy (TLT) without the need for repeated endotracheal intubation operations, neck movements and phases of apnea, in order to make this technique practicable and completely safe in the case of patients who are difficult to intubate, have cervical rachis injuries or suffer from serious hypoxemia. SETTING: Multi-purpose intensive care. PATIENTS: Fourteen patients (18-79 years old) to undergo tracheostomy, suffering from various limitations contraindicating the performance of a TLT according to the original Fantoni technique. OPERATION: Distinctive elements of the illustrated technique are: 1) the use of a fiber-bronchoscope in place of the rigid tracheoscope; 2) the insertion into the trachea of a particular guidewire, with J-shaped tip, placed on the outside of the artificial airway; 3) the use of a small-diameter endotracheal tube positioned coaxially to the original airway, to ventilate the patient during the introduction of the tracheostomy tube. RESULTS: TLT was performed on 13 patients. In one case it was not performed because of the impossibility of introducing the thin endotracheal tube in the original artificial airway. No problems, complications or SatO2 reductions occurred during operations. CONCLUSIONS: The variation presented is a safe and easy-to-perform technique considered advantageous in the case of TLTs performed on patients suffering from serious hypoxemia, who are difficult to intubate or have cervical rachis injuries.     

mtDNA variation in the Yanomami: evidence for additional New World founding lineages

Native Americans have been classified into four founding haplogroups with as many as seven founding lineages based on mtDNA RFLPs and DNA sequence data. mtDNA analysis was completed for 83 Yanomami from eight villages in the Surucucu and Catrimani Plateau regions of Roraima in northwestern Brazil. Samples were typed for 15 polymorphic mtDNA sites (14 RFLP sites and 1 deletion site), and a subset was sequenced for both hypervariable regions of the mitochondrial D-loop. Substantial mitochondrial diversity was detected among the Yanomami, five of seven accepted founding haplotypes and three others were observed. Of the 83 samples, 4 (4.8%) were lineage B1, 1 (1.2%) was lineage B2, 31 (37.4%) were lineage C1, 29 (34.9%) were lineage C2, 2 (2.4%) were lineage D1, 6 (7.2%) were lineage D2, 7 (8.4%) were a haplotype we designated "X6," and 3 (3.6%) were a haplotype we designated "X7." Sequence analysis found 43 haplotypes in 50 samples. B2, X6, and X7 are previously unrecognized mitochondrial founding lineage types of Native Americans. The widespread distribution of these haplotypes in the New World and Asia provides support for declaring these lineages to be New World founding types.     

辽宁省杨家杖子钼矿田及外围二轮找矿潜力分析

杨家杖子钼矿是建国初期在前苏联帮助下建成的我国建国后第一座重要的有色金属工业基地。历经六十余年的开发,区内资源严重危机。本文在对矿田勘查和开发调查的基础上,通过对矿田地质背景和矿床地质特征的研究,对该区及外围二轮找矿潜力进行了分析,指出了下步地质勘查的突破方向。     

Retrospect: Psychology as a profession.

(This reprinted article originally appeared in the Journal of Consulting Psychology, 1937, Vol 1, 1–3. [The following abstract of the original article appeared in PA, Vol 11:2040].) States that the development of psychology as a science and its application to the control of human conduct may in the course of the coming century be as significant for civilization as has been the industrial revolution. The growth of applied psychology is discussed as well as the importance of professional schools and professional standards to the development of psychology as a profession, and the growth of the American Psychological Association since its founding in 1892. The author describes his involvement in 2 efforts to develop psychology as a profession and notes 2 successful undertakings: the Journal of Consulting Psychology and the Psychological Corporation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)