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。     

挤压铜扁线的物理性能检测

采用连续挤压方法生产铜扁线作为一种新型工艺,对挤压铜扁线的物理性能检测,改善铜扁线的导电性、延展性和抗拉强度,分析了挤压铜扁线物理性能检测的不同方法,分别对超声波检测、荧光检测、热塑淬火检测、荷载检测方法进行描述,通过论证对比确定各种方法检测挤压铜扁线的物理性能的优劣,并对检测中的注意事项和检测要领进行了简单阐述,指导连续挤压方法生产铜扁线工艺的改进,改善挤压铜扁线的物理性能。     

带钢表面缺陷检测方法研究进展

带钢是一种重要的钢铁材料,工业生产过程中带钢表面会产生各种不同的缺陷。带钢表面缺陷对产品有重要影响,其特征复杂、多样且不易获取,因此带钢表面缺陷检测一直是研究的重点内容。对带钢表面缺陷检测技术方法的研究进展进行了论述与分析。结合带钢表面缺陷种类,对传统的带钢表面检测方法如人工检测、红外检测、涡流检测和漏磁检测等优缺点进行比较分析,得出这些方法存在检测速度低、无法达到实时在线检测和需要人为干预等缺点。最后对机器视觉的检测方法开展了归纳总结,对基于深度学习的机器视觉识别表面缺陷的原理和方法进行了详述并对未来发展趋势进行了展望。     

金属基复合材料增强体体积含量检测方法概述

金属基复合材料的增强体体积含量是表征其性能的一个重要指标。简要介绍了金属基复合材料增强体体积含量的检测方法以及标准化进展。对显微镜法、图像分析仪法和基体溶解法的适用范围、方法原理、试验设备、试样制备和试验方法进行了系统的总结,并对3种检测方法的优缺点进行了比较分析。分析了金属基复合材料增强体体积含量检测方法的国家标准现状,并对未来体积含量国家标准的制定进行了展望。     

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。     

建筑幕墙检测双供风波动系统

以现行国家标准<建筑幕墙气密、水密、抗风压性能检测方法)GWr 15227-2007为依据,对建筑幕墙水密性能波动加压法检测中存在的一些问题进行了研究.通过对目前检测市场上采用的几种检测系统进行比较,分析了各自的优点和不足,并在借鉴几种检测系统优点的基础上,提出了双供风波动系统的设计方案,为建筑幕墙检测系统的设计提供参考.     

基于模板匹配方法的棒材数量检测

通过对模板检测目标方法进行研究,提出了一种检测棒材数量的方法。该方法首先采用数学形态学的方法和对棒材端面图像进行二值化并提取边界,得到棒材端面的边界图像,然后采用模板匹配的方法对多个圆进行匹配度计算并得到圆心。试验表明该方法是有效、可行的,与传统的Hough变换方法检测圆心的方法相比,本文的方法极大地减少了运算量,大幅度减少了运算时间。     

国内外膨润土指标对铁矿球团性能影响的探讨

对１８种国产膨润土分别采用国内和国外的质量标准和检测方法进行了测定，根据测定结果，对国外的检测方法的进行了比较。     

基于数字图像处理的带钢缺陷检测和度量

针对带钢表面麻点和裂纹缺陷,设计了一种缺陷检测和度量方法。首先对样本图像进行滤波、二值化、细化及去毛刺操作,在得到的二值图上进行麻点缺陷检测,骨架图上进行裂纹缺陷检测。最后,在缺陷区域进行统计分析,得到样本图像的麻点缺陷数量和面积,裂纹缺陷的数量、长度和方向等指标。测试结果表明,该方法可有效实现带钢缺陷的检测和度量。     

一种三相电路通用电流综合检测方法

提出了一种新的实时检测三相三线制或三相四线制电力系统的基波正序分量、负序分量、谐波分量、有功分量、无功分量的方法。在理论分析的基础上，用MATLAB 6.1对两种电路进行了仿真，理论分析和仿真结果证实了所采用方法的有效性。此方法可广泛应用于有源电力滤波器(APF)和统一电能质量调节器(UPQC)的谐波检测电路。     

从能力验证结果看我国土壤重金属元素检测情况

根据2013—2018年期间土壤重金属元素(Ni、Cu、Zn、Pb、Cd、Cr、Hg、As)检测能力验证项目实验室参与情况,对各重金属元素检测的评价结果及采用的标准和检测方法进行了综合比较,分析了我国土壤中重金属检测的水平和发展趋势。结果表明,2013—2018年,我国土壤重金属检测实验室的检测水平逐年提高,参与能力验证的评价结果不满意率从2013年的8.6%降到了2018年的3.8%;获得认可的实验室能力验证平均满意率为92.9%,而非认可实验室平均满意率为88.3%;实验室检测所采用的标准以国家标准和环境标准为主,分别有57%和20%的实验室采用,其次是地矿、城建和农业等行业标准,国际标准的采用渐呈增长趋势,能达到4%。     

从能力验证结果看我国土壤重金属元素检测情况

根据2013—2018年期间土壤重金属元素(Ni、Cu、Zn、Pb、Cd、Cr、Hg、As)检测能力验证项目实验室参与情况,对各重金属元素检测的评价结果及采用的标准和检测方法进行了综合比较,分析了我国土壤中重金属检测的水平和发展趋势。结果表明,2013—2018年,我国土壤重金属检测实验室的检测水平逐年提高,参与能力验证的评价结果不满意率从2013年的8.6%降到了2018年的3.8%;获得认可的实验室能力验证平均满意率为92.9%,而非认可实验室平均满意率为88.3%;实验室检测所采用的标准以国家标准和环境标准为主,分别有57%和20%的实验室采用,其次是地矿、城建和农业等行业标准,国际标准的采用渐呈增长趋势,能达到4%。     

微波测水自动控水技术在水钢烧结系统的生产应用

微波测水与其他测水方式相比较具有抗干扰性强,控制滞后相对较小,测量准确,安全可靠的特点,经过近几年的生产实践及不断完善,技术趋于成熟,可作为红外线测水后的一项升级换代技术,是烧结混合料测水技术的一个发展方向。本文介绍了微波测水自动控制系统的功能、微波测水与红外线测水的对比、微波测量水分自动加水在实际生产过程中应用情况、主要技术经济指标情况以及存在的不足。     

Detection of carbohydrates in capillary electrophoresis

This review focuses on recent developments in sensitive detection modes for carbohydrates after separation by capillary electrophoretic methods. To bring detection sensitivity for carbohydrates analysis in line with current methods in protein sequencing, concentration detection limits of 10(-6) molar or better are required. A discussion of mass detection limits and concentration detection limits is followed by an overview of detection modes for natural and labeled carbohydrates. Amperometric detection and UV and laser-induced fluorescence detection after reductive amination, in particular with 8-aminonaphthalene-1,3,6-trisulfonic acid (ANTS), are discussed in more detail. Finally, the paper outlines developments to be expected in the near future, focusing on the needs in glycobiology such as improved sensitivity and selectivity.     

涡流探伤在钢管生产中的应用

介绍了钢管涡流探伤的原理、特点;涡流探伤方法对钢管缺陷的检测及对检出缺陷的处理方法,影响涡流探伤的因素及涡流检测的局限性。     

Trade-offs in Detecting Letters and Comprehending Text.

Critics of the letter detection task have questioned whether findings from that paradigm reflect normal reading processes. The present study addresses these questions using a new computerized version of the letter detection task in which reading rate along with letter detection and comprehension accuracy are examined. Previous letter detection findings were replicated with this new computerized task. Different conditions were compared in which detection and comprehension instructions were manipulated as well as the salience of the target letters. The requirement to comprehend had small effects on letter detection accuracy and reading rate, and letter detection only modestly reduced comprehension. Thus, the procedures developed in this study permit examination of the component processes contributing to performance in the letter detection task. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

铌的光度分析试剂及其在光度分析中的应用

铌的分析测定对于航天、电子、通讯、能源等行业的发展都具有重大意义。近年来各种新试剂、新方法的不断涌现，使铌的光度分析有了新的进展。通过对铌的光度分析试剂予以综述，重点介绍了各类显色剂及其显色反应体系、相应光度分析方法的最大吸收波长、摩尔吸光系数、检测限、干扰情况及其应用。     

A technique of PVC detection in QRS wave

A technique of PVC detection is described in this paper. The procedures of PVC analysis include noise detection, QRS detection, feature extraction and QRS wave classification. The interference is detected in hierarchy ways. A new non-linear transformation of ECG waveform is given to be taken as the QRS detection function. Taking this QRS detection function, the influence of noise and interference can be reduced greatly. By the technique of QRS template matching, QRS waveforms are sorted into different clusters in QRS wave form space. Then a linear classifier is used to identify the medical meaning of these clustes. Before the linear classifier is applied, the QRS waveforms are classified according to some special decision rules. 38 half-hour standard database is used to test the technique presented in this paper. The result shows t hat accuracy rate of PVC detection is better than 95%.     

Differences in detection of alcohol use in a prenatal population (on a Northern Plains Indian Reservation) using various methods of ascertainment

Although Fetal Alcohol Syndrome (FAS) rates have been reported to be higher in American Indian populations, no screening tool has been validated for alcohol use in American Indian women. The objectives of this study were to compare the detection of prenatal alcohol use by a self-administered questionnaire to detection by clinical interview; and to ascertain whether the screening tool would increase detection of pregnant women who are abusing alcohol. The hospital records of the women were reviewed for any history of alcohol-related illnesses or injuries to compare with results obtained from the questionnaire. Seventy women attending their first prenatal clinic visit on a reservation were screened for alcohol use. There was a wide range in detection of prenatal alcohol use (20%-71% of the sample detected) depending on the method used. There was a large variation in sensitivities (7%-93%) of the individual questions in identifying patients detected as "high risk" by the clinicians. The T-ACE screening questions significantly increased detection of alcohol use compared to detection by the clinicians (p = 0.04 Fisher's exact test). Due to the large variation between different methods of detection, it is recommended that screening tools that increase detection of alcohol use should be combined with methods of higher specificity such as using questions about quantity and frequency of alcohol intake, medical chart review and clinical interview. We also found that various interpretations of the screening questions by the patients highlighted the need to tailor the wording of individual questions to the particular patient population.     

超声波探伤在吊车梁检测中的应用

简要介绍了吊车梁翼板与腹板焊接T型焊缝超声波探伤前的预处理,超声波探伤方法的选择及操作要点,评定与记录。