悬索桥伸缩缝焊缝表面无损检测工艺分析

通过对几种表面无损检测方法的分析、研究,针对马鞍山长江公路大桥左汊悬索桥伸缩缝焊缝表面无损检测的实例,选择了磁粉检测和渗透检测方法;并对检测器材、检测设备、检测工艺等进行了探讨,阐述了检测过程中的注意事项。     

涡流检测技术在金属表面缺陷检测中的应用

本文对无损检测的发展概况进行了介绍,并对涡流检测的原理进行了详细的阐述。基于涡流及其趋肤效应原理,对等效阻抗法、低频涡流检测、高频涡流检测、多频涡流检测、扫频涡流检测、阵列涡流检测几种常用的涡流检测方法进行了介绍。以金属回转体表面缺陷检测为例,结合具体的试验方案、软硬件要求、试验结果数据分析,描述了涡流检测的实际应用效果。     

石钢在线超声检测生产实践

介绍了超声检测技术的原理,针对现场检测时出现的问题,对超声探伤设备进行了改进,检测结果得到了用户的一致认可,未发现检测质量问题.     

钢材无损检测试验方法标准体系述评

介绍了钢材无损检测试验方法标准体系,对国内外钢材无损检测标准体系进行了分析对比,阐述了我国无损检测标准的特点,介绍了无损检测方法标准改革的初步方案。     

基桩检测探讨

根据基桩检测分类,论述了桩基的检测方法和对基桩施工质量的影响因素,探讨了基桩检测中存在的问题、检测方法及设备存在的局限性。     

无损检测技术可靠性的探讨

本文对无损检测技术可靠性进行探讨,分析了无损检测技术可靠性的真正含义,论述了可靠性对产品质量的影响,分析了影响可靠性的因素,增加无损检测的可靠性措施,提高了产品质量检测的可靠性.     

在线超声检测技术及其在水平连铸坯生产中的应用

铜及铜合金水平连铸坯内部通常存在气孔、疏松、裂纹等缺陷,严重影响产品质量和成材率。基于超声波检测原理结合C扫描成像技术和多通道扫描技术可对各类铸坯缺陷进行精确检测和实时显示。设计开发了可在线往复检测的超声检测设备,并对水平连铸铜板带坯在线检测结果进行验证。对检测异常处采取了金相试验,以此确认检测异常处是否为缺陷,从而验证设备检测结果的准确性。收集后续铜板带成材率数据,并与在线检测数据进行对比分析,给出了两者之间的相互联系。在线超声检测设备拥有检测数据可实时反馈以及检测精度高等优点,能为企业的实际生产与决策提供数据参考。     

黄金检测技术发展历程与展望

随着科学技术的不断发展,中国黄金检测技术得到了大幅提升。从黄金检测的历史、标准化道路、质量保证、自动化智能化发展4个方面阐述了黄金检测技术的发展历程,并对黄金检测的未来发展方向进行了展望,以期为黄金检测技术的高质量发展提供参考。     

激光跟踪仪在检测连铸机安装精度中的应用

简要介绍了典型连铸机安装部位的精度要求以及目前检测方法的现状,同时介绍了激光跟踪仪的检测原理、方法和精度。主要通过激光跟踪仪在检测连铸机安装精度中的实际应用,在可行性、检测数据及检测耗时方面与现有检测方法进行对比分析,说明了激光跟踪仪在检测连铸机安装精度中的实用性、精准度和高效率。     

钢材的在线和成品检测

本文综述了国内外型钢的表面和内部缺陷的检测,钢管的检测,带钢的检测,线棒材的检测等.     

高温连铸坯探伤技术探讨

通过对高温状态下连铸坯表面缺陷探伤的两种常见方法的对比，并从其检测原理、检测装置、价格等方面进行探讨，提出适合于国内钢铁企业高温连铸坯表面缺陷的有效检测方法。     

Deceiving Oneself About Being in Control: Conscious Detection of Changes in Visuomotor Coupling.

Previous research has demonstrated that compensatory movements for changes in visuomotor coupling often are not consciously detected. But what factors affect the conscious detection of such changes? This issue was addressed in 4 experiments. Participants carried out a drawing task in which the relative velocity between the actual movement and its visual consequences was perturbed. Unconscious compensatory movements and conscious detection rates were simultaneously recorded. There was an invariant relationship between the extent of the change and its conscious detection that was proportional to the initial drawing velocity. This suggests that conscious change detection relies on a system that integrates visual and motor information-as, for instance, suggested by the internal model theory of motor control. Figural discrepancies increased the detection rates, indicating that additional cues for the what system facilitate conscious change detection. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

剪切法测定中厚板厚度方向性能及标准化

针对中厚板的厚度方向性能测定,设计了一种剪切模具。阐述了剪切模具的检测原理及工作原理,并描述了其基本组成部分及试验方法,对于中厚板厚度方向性能的测定有较好的实用价值,并为该方法的标准化做了初步工作。     

航空薄壁管探伤设备的调试和检验

随着某特殊产品的订货标准不断更新,对其检测手段也在不断改进。通过对原有探伤设备更新双通道电脑数字探伤仪,达到改单探头探伤为双探头探伤。按GB/T5777-95标准的C5级验收,系统综合性指标符合YB-4082-2000标准规定的要求,为航空薄壁管的质量提供可靠检测手段。     

GKD2型内燃机车司控器试验电路

以前对司控器逻辑关系的检测都是采取手工检测方法,即用万用表测量触头是处于闭合还是处于分断状态,存在着检测速度慢,检测效果不好及检测不可靠等缺点.为此设计了为辅修时对GKD2型内燃机车司机控制器动作进行检测的试验电路,并描述了试验电路的工作原理、主要功能及其实现方法.     

地下水污染检测技术研究进展

矿产资源的开采及工农业生产等活动不仅对地下水环境造成严重污染,同时对人体健康构成威胁,对地下水质检测逐渐引起研究者们的日益重视.在系统地总结地下水污染物的来源、种类和特点的基础上,论述地下水污染检测技术的国内外发展现状,其中包括:有机污染物检测、无机污染物检测、病原菌微生物检测及多种衍生技术的联合应用检测,并对不同检测方法进行对比,阐述分析各检测方法的优缺点及其未来的发展趋势.      

The effect of VIP/PACAP family of peptides on pancreatic blood flow and secretion in conscious dogs

Coherent oscillatory activity of a population of neurons is thought to be a vital feature of temporal coding in the brain. We focus on the question of whether a single neuron can transform a spike code into a rate code. More precisely, how does a neuron vary its mean output firing rate, if its input changes from random to coherent? We investigate the coincidence detection properties of an integrate-and-fire neuron in dependence upon internal parameters and input statistics. In particular, we show how coincidence detection depends on the membrane time constant and the threshold. Furthermore, we demonstrate that there is an optimal threshold for coincidence detection and that there is a broad range of near-optimal threshold values. Fine-tuning is not necessary.     

U75V钢轨轨腰探伤不合原因的分析

为查明U75V钢轨轨腰探伤不合原因,采用垂直探伤定位法准确定位缺陷后,利用光学显微镜、扫描电镜对定位的缺陷部位进行了非金属夹杂物、金相组织等检验分析.结果表明,在U75V钢轨轨腰探伤不合处存在长度超过2.0mm的异常大硅酸盐类非金属夹杂物和组织偏析,分析认为异常大硅酸盐类非金属夹杂物是导致探伤不合的主要原因.     

基于图像的圆盘剪侧隙和重合量测量技术

介绍了一种圆盘剪侧隙和重合量的检测方法，针对检测对象的位置及成像特点，采用Canny算子边缘提取法得到检测边缘，具有精度高、算法快的特点，以此开发了相应的检测系统，应用于生产线上，满足了生产检测需求，提高了生产效率。     

Usefulness and limitations of ultrasonography in the initial evaluation of blunt abdominal trauma

BACKGROUND: In the assessment of blunt abdominal trauma, the reliability of ultrasonography (US) in identifying individual organ injuries remains uncertain, in spite of its usefulness in detecting hemoperitoneum. This study was designed to evaluate the overall diagnostic value of US, including identification of individual organ injuries. METHODS: The accuracy of US in the detection of intra-abdominal injuries and the identification of individual organ injuries was evaluated in 1,239 patients seen during a 15-year period. Accuracy was based on detection of intraperitoneal fluid, free air, or irregular parenchymal lesions. RESULTS: For the detection of injuries, US was 94.6% sensitive, 95.1% specific, and 94.9% accurate. Individual organ injuries were identified with sensitivities of 92.4, 90.0, 92.2, 71.4, and 34.7% for the liver, spleen, kidneys, pancreas, and intestine, respectively. CONCLUSION: US is reliable for the detection of injuries and the identification of solid-organ injuries despite its poor sensitivity for intestinal injuries.