方坯轧材超声波探伤设备的技术改进

主要研究超声波探伤技术在方坯轧材质量检测中的应用,结合生产实际对系统设备进行技术改进,为生产满足客户需求的高质量产品提供强有力的保障。对超声波探伤技术的原理和方法进行分析。介绍了方坯轧材产生波探伤检测系统的架构和相关工艺流程,重点阐述了此次对方坯轧材超声波探伤设备技术的改造和优化,从而提高了系统的稳定性和检测的精度,并满足客户对产品质量的高要求。     

超声波自动探伤设备在临钢3300mm中板生产线的应用

主要介绍了中厚板超声波自动探伤设备的构造、原理、参数和超声波探伤设备的使用方法及工艺流程。     

超声波自动探伤设备在天钢3500mm中厚板生产线上的应用

通过中厚板探伤实践,找出了适合探伤的钢板温度、探头的水膜厚度、入射波高等参数,对影响超声波探伤的因素和探伤设备使用、维护的情况进行了探讨。     

包钢60公斤/米重轨超声波在线探伤试验、试生产总结

包钢60kg/M重轨超声波在线探伤,是在保证重轨探伤灵敏度的前提下,尽量使它与50kg/M重轨在线探伤的方法和设备统一。铁科院金化所探伤室承担了这方面的研究,在探伤方法的制订和设备的研制,以及探伤设备的现场使用上,都做了大量的工作,从而为包钢60kg/M重轨超声波在线探伤的投产使用做出了成绩。这一方案的实现也     

探伤设备综合性能测试方法浅析

为保证公司自动无损探伤设备可靠运行,持续为用户提供质量合格、稳定的钢材产品,针对公司在用圆钢和钢板超声探伤设备从信噪比、漏报率、误报率等方面探讨综合性能测试方法。     

重轨超声波随动探伤装置的研究与设计

由于铁路运输速度和载重的不断增长,对钢轨质量提出了越来越高的要求,在线超声波探伤成为生产高质量钢轨的必要手段。固定接触式超声波探伤装置与钢轨属于刚性接触,易磨损,探伤准确率低,针对这一缺点,提出了随动探伤设计理念,阐述了随动式超声波探伤装置的工作原理、结构组成及设备特点。该装置的应用大幅降低了超声波误判率和重轨在线检测成本。     

自动探伤设备检测缺陷能力的评价试验

采用若干符合用户要求的带有两种人工缺陷的样管,在钢管公司的漏磁探伤和超声波探伤机组进行了自动探伤设备检测缺陷能力的评价试验。结果表明,各探伤机组全部能够稳定地检测出钢管存在的横、纵向缺陷。漏磁探伤对斜向缺陷的检出效果优于超声波探伤。公司主要自动探伤设备能力能够满足大型石油公司的要求。     

提高中厚板探伤合格率实践

阐述了南阳汉冶特钢中厚板超声波探伤的攻关实践,总结出汉冶特钢中厚板探伤不合缺陷主要表现为非金属夹杂、中心偏析、内部裂纹等,并分析了产生上述缺陷的工艺原因。结合汉冶公司的自身装备、工艺实际,摸索出了钙化处理、过热度控制、堆垛缓冷等一系列有效解决中厚板探伤不合格的方法,最终使探伤不合格影响产品质量的局面得到有效遏制。     

钼粉粒度均匀性对钼渗铜材料组织的影响

采用熔渗法制备了钼渗铜材料。采用超声波探伤的方法对钼渗铜材料进行了无损检测，采用SEM和金相分析对钼渗铜材料进行了微观组织观察，分析了钼粉的粒度均匀性对钼渗铜钼材料组织的影响。研究结果表明：粉末粒度均匀性对钼骨架的渗铜性能有影响；粉末中存在的细颗粒较多或者有粉末团聚现象时，钼骨架局部细小孔隙聚集，铜难以渗入这些聚集的小孔隙，造成超声波探伤渗铜均匀性不佳；超声波探伤发现的“面积型渗铜不均”实际是“密集微孔聚集”。     

提高Q370qE钢板超声波探伤合格率的实践

为提高Q370qE钢板的超声波探伤合格率,对Q370qE钢板超声波探伤不合格的地方进行了取样分析.结果表明:影响超声波探伤合格率的主要原因是钢中的非金属夹杂物、中心偏析严重造成的钢板分层、连铸的保护渣和耐火材料的卷入、铸坯的裂纹.采取提高钢的纯净度、改变夹杂物的形态、控制浇注温度和拉速等改进措施后,超声波探伤合格率由75%提高到97%.     

Children's and adults' spontaneous false memories: long-term persistence and mere-testing effects

In studies of children's false memories of word lists, it has been found that false alarms are stable over long-term retention intervals (persistence effect), that the stability of false alarms can equal or exceed that of hits, that earlier memory tests increase the frequency of hits on later tests (true-memory inoculation effect), that earlier memory tests increase the frequency of false alarms on later tests (false-memory creation effect), and that test-induced increases in false alarms can equal or exceed increases for hits. We studied these phenomena in 6-, 8-, and 11-year-olds and in adults using short narratives about everyday objects and events. All of the phenomena were detected at all ages, but levels of spontaneous memory falsification were much higher than for word lists and patterns of developmental change were somewhat different. Important new findings were that the persistence effect and the false-memory creation effect were greatest for statements that would be regarded as factually incorrect reports of events in sworn testimony and that, like suggestive questioning, interviews that involve nonsuggestive recognition questions may nevertheless taint children's memories.     

False recognition and the right frontal lobe: a case study

We described a patient, BG, who exhibited a striking pattern of false recognition after an infarction of the right frontal lobe. Seven experiments document the existence of the phenomenon, explore its characteristics, and demonstrate how it can be eliminated. BG showed pathologically high false alarm rates when stimuli were visual words (experiments 1 and 4), auditory words (experiment 2), environmental sounds (experiment 3), pseudowords (experiment 5), and pictures (experiment 7). His false alarms were not merely attributable to the semantic or physical similarity of studied and non-studied items (experiments 4 and 5). However, BG's false recognitions were virtually eliminated by presenting him with categorized stimuli and testing him with new stimuli from non-studied categories (experiments 6 and 7). The results suggest that BG's false alarms may be attributable to an over-reliance on memory for general characteristics of the study episode, along with impaired memory for specific items. The damaged right frontal lobe mechanisms may normally support the monitoring and/or retrieval processes that are necessary for item-specific recognition.     

铝电解阳极导杆钢爪清理机的改进与设计

结合本单位阳极组装生产线上钢爪清理机的实际应用,针对已使用过的清理阳极导杆组钢爪表面的抛丸机和钢丝清刷机两种机械存在的缺陷,提出应用钢丝绳清理机这一新型设备清理钢爪表面。文章介绍了新型清理机的结构形式、工作原理及其使用效果。     

Using maintenance rehearsal to explore recognition memory.

We examined associative and item recognition using the maintenance rehearsal paradigm. Our intent was to control for mnemonic strategies; to produce a low, graded level of learning; and to provide evidence of the role of attention in long-term memory. An advantage for low-frequency words emerged in both associative and item recognition at very low levels of learning. This early emergence casts doubt on explanations based on the traditional concept of recollection. A comparison of false alarms supports a role for item information or the joint use of cues but not familiarity in producing associative false alarms. We may also have found a way to measure the amount of attention being paid to a to-be-learned item or pair, independently of memory performance on the attended item. This result may be an important step in determining whether coherent theories about the role of attention in long- and short-term memory can be created. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于机器视觉技术的提升机箕斗机械闭锁装置智能分析系统及应用

针对蚕庄金矿采用底卸式双侧挂钩机械闭锁出现的箕斗出曲轨后不能准确复位、卡箕斗和导向轮松动移位甚至脱落等故障,设计研发了一种基于机器视觉技术的提升机箕斗机械闭锁装置智能分析系统。详细介绍了该系统的工作原理、系统组成和主要功能等。现场应用表明:该系统具有处理智能化、速度快、精度高、稳定性好的优点,实现了同类设备非接触式实时在线监测,对同类设备的安全生产有着极为重要的现实意义,兼顾了经济效益和社会效益,推广应用前景较好。     

铝箔分切机的超声波焊接应用

结合铝箔分切机超声波焊接装置的结构及组成特点，阐述了超声波焊接机的参数调整及应用效果，为更好地了解和使用铝箔超声波焊接技术提供了支持。     

When false recognition is unopposed by true recognition: Gist-based memory distortion in Alzheimer's disease.

The authors examined false recognition of semantic associates in patients with probable Alzheimer's disease (AD), older adults, and young adults using a paradigm that provided rates of false recognition after single and multiple exposures to word lists. Using corrected false recognition scores to control for unrelated false alarms, the authors found that (a) the level of false recognition after a single list exposure was lower in AD patients than in controls; (b) across 5 trials, false recognition increased in AD patients, decreased in young adults, and showed a fluctuating pattern in older adults; and (c) all groups showed an increase in true recognition over the 5 trials. Analyses suggested that AD patients built up semantic gist across trials, whereas both control groups were able to use increased item-specific recollection and more conservative response criteria to suppress gist-based false alarms. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Relationship between measures of working memory capacity and the time course of short-term memory retrieval and interference resolution.

The response-signal speed–accuracy trade-off (SAT) procedure was used to investigate the relationship between measures of working memory capacity and the time course of short-term item recognition. High- and low-span participants studied sequentially presented 6-item lists, immediately followed by a recognition probe. Analyses of composite list and serial position SAT functions found no differences in retrieval speed between the 2 span groups. Overall accuracy was higher for high spans than low spans, with more pronounced differences for earlier serial positions. Analysis of false alarms to recent negatives (lures from the previous study list) revealed no differences in the timing or magnitude of early false alarms, thought to reflect familiarity-based judgments. However, analyses of false alarms later in retrieval indicated that recollective information accrues more slowly for low spans, which suggests that recollective information may also contribute less to judgments concerning studied items for low-span participants. These findings can provide an explanation for the greater susceptibility of low spans to interference. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Ironic effects of repetition: Measuring age-related differences in memory.

Four experiments examined ironic effects of repetition, effects opposite to those desired (cf, D. M. Wegner, 1994). For an exclusion task, participants were to respond "yes" to words heard earlier but "no" to words that were read earlier. Results from young adults given adequate time to respond showed that false alarms to earlier-read words decreased with their repetition. An opposite, ironic effect of repetition was found for elderly adults—false alarms to earlier-read words increased with repetition. Younger adults forced to respond quickly or to perform a secondary task while reading words showed the same ironic effect of repetition as did elderly adults. The process-dissociation procedure (L. L. Jacoby, 1991, 1998) was used to show that factors that produce ironic effects do so by reducing recollection while leaving effects of repetition on familiarity unchanged. (PsycINFO Database Record (c) 2010 APA, all rights reserved)