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关键词： structure health monitoring   high-speed vision   belt vibration analysis   wide -area conveyor monitoring   instrumentation   control and system engineering  

摘要： This study proposes a novel video -based conveyor monitoring method that can estimate distances between belt-supporting rollers by analyzing belt vibration responses in high -frame -rate (HFR) images. Focusing on the fact that the vibration components of a belt include frequencies inversely proportional to the distance between its ends, roller-to -roller distances that correspond to the state of contact between a belt and rollers are estimated by HFR-video-based analysis that can detect vibration peak frequencies at multiple belt positions without directly observing them captured in images. Its effectiveness was verified by conducting a wide -area monitoring test of a material handing conveyor in ironworks for roller-to -roller distance estimation with vibration frequency analysis at multiple points on its several -tens -of-meters belt in 9344x600 images captured at 300 fps.

关键词： Subsurface dam   Analytical solutions   Fundamental solutions method   Underground dam   Groundwater hydraulics  

摘要： A steady-state semianalytical solution for evaluating the hydraulic head distribution created by a rectangular underground dam that fully penetrates a sloping aquifer is proposed. The length of the dam concerns only a limited part of the aquifer width. This solution uses the second method of linearization of the nonlinear partial differential equation, a closer approximation of the exact solution, which allows for the consideration that the saturated thickness varies in space. This solution improves upon a previous solution, which was developed with the use of the first method of linearization (assuming a negligible variation in saturated thickness). Results show that the maximum differences in aquifer hydraulic head upgradient and downgradient across the centre of the dam are almost identical (deviation < 2%), even when the degree of saturation or desaturation near the dam (beta) is similar to 50%. However, the previous solution overestimates the hydraulic head upgradient of the dam and underestimates it downgradient with deviations increasing as beta increases. This study shows that if beta <= 20% the solution with the first linearization method gives satisfactory results, which is similar to previous studies. Otherwise, it is preferable to use the new solution developed. Analysis of the solution included sensitivity tests and type curves to evaluate the maximum hydraulic differences induced by the underground dam. The proposed solution can be implemented as an operational tool for engineers designing underground dams and is meant to supplement existing hydrogeological models for improving the design of such structures.

关键词： 掌上电脑  

ISBN: (纸本)9787121491030

摘要： 本书系统地诠释工业PDA(ProcessDataAcquisition)高速数据采集分析系统的一般原理，结合丰富的插图，介绍该系统的功能、性能指标、安装使用方法；广视角地剖析该系统支持的PLC、硬件接口模块、数据总线类型；详细阐述完全开放的数据接口。本书共13章，充分展示PDA高速数据采集分析系统架构、技术研发、应用策略，以及数据采集原理、编程技巧。其中涉及的相关系统，如长期趋势分析系统、开放式高频时序数据库、数据库系统及升迁工具、数字钢卷转换计算系统、数字钢卷快速搜索统计系统、设备诊断同步过采样系统、轧辊剥落预警及快停系统、辊道电流监测系统、高频高密高速数据平台等，具有重要的工程指导意义。本书是工程经验的总结，可作为工作手册，为质量分析和大数据平台提供基础数据。

关键词： Aluminum castings  

摘要： In recent years, the applications of aluminum castings have changed from internal combustion engine parts, such as engine blocks, to components such as battery cases and vehicle bodies. Shrinkage porosity causes a significant loss of strength in these aluminum castings, and it is important to improve the accuracy of shrinkage porosity prediction using casting CAE. Kobelco Research Institute, Inc. owns the equipment to acquire physical property values via casting CAE. In this study, sand mold aluminum castings have been prototyped, and shrinkage porosity has been predicted by the casting CAE. To compare the prediction accuracy, analyses have been performed using casting CAE on two cases;default data based on thermodynamics calculation and data acquired by Kobelco Research Institute, Inc. The results are presented in this paper. © 2024 Kobe Steel Ltd. All rights reserved.

摘要： 《义务教育生物学课程标准(2022 年版)》提出要全面落实习近平新时代中国特色社会主义思想,将社会主义先进文化、革命文化、中华优秀传统文化、国家安全、生命安全与健康等重大主题教育有机融入课程,增强课程的思想性.初中生物作为一门研究生命现象和生命规律的学科,内容与社会生活中的很多情景息息相关,其中蕴含着很多思政素材,由于中考复习时间紧,任务重,教学中往往注重知识的讲解,而忽略思政教育.

关键词： 人工智能  

ISBN: (纸本)9787115654472

摘要： 本书对华为ICT大赛2023-2024实践赛昇腾AI赛道真题进行解析，涉及昇腾AI应用实战、昇腾全栈AI平台、MindSpore开发框架实践、AI算法与应用等技术方向。共4章，第1章先讲解华为ICT大赛目标，以及华为ICT大赛2023-2024比赛内容及方式，然后介绍实践赛昇腾AI赛道的赛制和考试大纲；第2-4章按照由浅入深的顺序逐步解析全国初赛、全国总决赛和全球总决赛的真题，在解析时根据各技术细分方向分解每道题的考点，帮助读者系统掌握考点、提升实践技能。

关键词： 计算机网络  

ISBN: (纸本)9787115654489

摘要： 本书对华为ICT大赛2023-2024实践赛网络赛道真题进行解析，涉及数通、安全和WLAN等技术方向。共5章，第1章首先讲解华为ICT大赛目标，以及华为ICT大赛2023-2024比赛内容及方式，然后介绍实践赛网络赛道赛制和考试大纲；第2-5章按照由浅入深的顺序逐步解析2023-2024省赛初赛、省赛复赛、全国总决赛和全球总决赛的真题，解析时根据各技术方向讲解每道题的考点，帮助读者系统掌握考点、提升实践技能。

关键词： 电子计算机  

ISBN: (纸本)9787115654564

摘要： 本书对华为ICT大赛2023—2024实践赛计算赛道真题进行解析，涉及openEuler、openGauss、KunpengApplicationDevelopment等前沿技术。本书共5章，第1章先讲解华为ICT大赛目标，以及华为ICT大赛2023—2024实践赛和创新赛，然后介绍实践赛计算赛道的赛制和考试大纲；第2～5章按照由浅入深的顺序逐步解析省赛初赛、省赛复赛、总决赛和全球总决赛的真题，解析时根据各技术细分方向分解真题涉及的考点，帮助学生系统掌握考点相关知识并提升实践技能。

关键词： 17α-羟化酶/17,20-裂解酶缺乏症   先天性肾上腺皮质增生症   高血压  

摘要： 17α-羟化酶/17,20-裂解酶缺乏症(17α-hydroxylase/17,20-lyasedeficiency,17-OHD)是先天性肾上腺皮质增生症中的罕见类型,临床以性发育异常、高血压和低血钾为主要表现,文献报道初诊年龄多在青少年阶段。本文报道1例中年女性初诊为17-OHD患者,并对该患者临床特点进行分析。

关键词： 云计算  

ISBN: (纸本)9787115654571

摘要： 本书对华为ICT大赛2023-2024实践赛云赛道真题进行解析，涉及云、大数据、AI这3个技术方向。共5章，第1章先讲解华为ICT大赛目标，以及华为ICT大赛2023-2024实践赛和创新赛的比赛内容，然后介绍实践赛云赛道赛制和考试大纲；第2-5章按照由浅入深的顺序逐步解析省赛初赛、省赛复赛、全国总决赛和全球总决赛的真题，解析时根据各技术方向分解每道题的考点，帮助读者系统掌握考点并提升实践技能。