对热轧带肋钢筋重量偏差进行预报的可行性探讨

对重量偏差数据的统计分析表明,马钢生产的热轧带肋钢筋重量偏差富余量较大,而锯切前后,所测量的钢筋长度对重量偏差影响很小。本文提出可以对80%来样,通过直接称重量和测量长度来计算重量偏差,而对20%的来样,进行锯切加工后,测量钢筋的长度,计算重量偏差,用做数据的比对。     

GB1499—1998钢筋混凝土用热轧带肋钢筋标准问题解答

问题１：当钢筋的重量偏差符合标准的要求时，其内径偏差是否可不保？答：对，这与原标准的规定正好相反。由于重量偏差是在成批生产后才测量的，不能及时反馈进行工艺控制，企业应根据标准中规定的重量偏差值，反算出符合标准要求的内径偏差值，以便于现场控制。问题２：...     

舞钢锅炉及压力容器用19Mn6/P355GH钢板技术条件

1 适用范围 本技术条件完全等同采用DIN17155/EN10028标准,适用于制造蒸汽锅炉设备、压力容器及其构件用厚度≤150mm的钢板。 2 尺寸、外形、重量及允许偏差 19Mn6/P355GH钢板的尺寸、外形、重量及允许偏差应符合DIN1543/EN 10029标准规定。 3 技术条件 3.1 冶炼方法     

钢筋混凝土用热轧带肋钢筋 大企业产品用着放心

国家质量监督检验检疫总局 2 0 0 2年对热轧带肋钢筋进行了产品质量国家监督专项抽查 ,抽查范围包括生产企业、建材市场和建筑工地。抽查结果表明 ,一是大中型企业产品质量较好 ,小型企业的产品抽样合格率较低。二是在建筑工地抽查的产品质量问题较多。三是未获得生产许可证的企业的产品抽样合格率为 5 1.6% ,比获得生产许可证企业的产品抽样合格率 77.8%低 2 6.2个百分点。抽查中反映出的主要质量问题 :1.重量偏差问题普遍存在。重量偏差是热轧带肋钢筋的重要质量指标 ,如果重量负偏差较大 ,会使钢筋的横截面积减小 ,相应的力学性能也会受…     

钢筋混凝土用热轧带肋钢筋理论重量交货的探讨

用重量允许偏差替代内径尺寸偏差交货是混凝土用热轧带肋钢筋新标准 GB14 99- 1998修订的重要内容之一。论述该变化给生产、设计和检验带来的影响及探讨内径变化与重量变化之间的关系 ,找出内径尺寸变化与重量变化之间的对应关系 ,为生产检验提供指导。     

HRB335热轧带肋钢筋试验分析

为确保HRB335热轧带肋钢筋力学性能，对其生产工艺、成分性能、重量偏差进行了分析研究，提出合理制定钢筋内控化学成分及重量偏差的建议并指导生产，取得了满意效果。     

热轧带肋钢筋负偏差轧制工艺

本文就螺纹钢实行负偏差轧制在工艺上作了探讨。生产中按负偏差轧制，产品的重量负偏差率为2-3％，负偏差轧制率达90％，产品质量符合标准要求，在横列式轧机上，螺纹钢实行负偏差轧制完全可行。     

热轧带肋钢筋负偏差轧制工艺

本文就螺纹钢实行负偏差轧制在工艺上作了探讨，生产中按负偏差轧制，产品的重量负偏差率为２－３％，负偏差轧制率达９０％，产品质量符合标准要求，在横列式轧机上，螺纹钢实行负偏差轧制完全可行。     

6VH连轧机推张力轧制的控制

钢管厂要求管坯的重量公差为±1%。这不仅是对管坯直径公差有较高的要求,而且要求管坯全长直径偏差控制在±1mm 范围内,否则无法实现钢管厂火焰切割机最佳化分切工艺。为此通过 PLC 对6VH 连轧机推拉钢轧制进行控制,对不同钢种采用微张力或微推力轧制,从而将管坯全长直径偏差控制在要求范围内。     

关于中厚板负偏差轧制中若干问题的探讨

本文阐述了中厚板负偏差轧制中有关负偏差轧制普明文经、利率、盈重率、盈重量和厚度目标值的概念及其计算方法。     

莱钢锻压厂推行负偏差轧制的措施

钢材产品实行负偏差轧制是企业提高经济效益的有效措施。莱钢锻压厂为实现负偏差轧制，除改进工艺技术、改造生产线外，还加强管理，提高操作技术水平，严格计量，严格岗位责任制，从而保证了负差材产品质量稳定，年多创经济效益１０００ 多万元。     

Innovative Data Acquisition for Heavily Instrumented Flexible Pavements

A data acquisition program was written to allow independent triggering of multiple test sections of a thin flexible pavement. A total of 129 electronic sensors were installed in 17 test sections and subjected to 2,100 truck passes over several months immediately after construction. The measured strains were highly variable in the thin flexible pavement, but the program was still able to successfully trigger each section independently. The majority of signal processing was also performed within the program, which was written in Lab VIEW 7 Express. This approach significantly reduced the amount of postprocessing effort that would have otherwise been required. The quality of the triggering approach was compared to independently collected weigh in motion data. The majority of the test sections recorded within 0.5% of the number of vehicles recorded by the weigh in motion system. Key components of all major facets of the data acquisition and programming performed are discussed in detail.     

多元线性回归在镀锌板锌层控制上的应用

通过实际生产中收集的大量锌层质量控制数据,结合多元线性回归方法,得出锌层质量控制的经验控制模型,对实际操作中快速命中预定锌层质量具有一定的指导意义。     

When infants take mothers' advice: 18-month-olds integrate perceptual and social information to guide motor action.

The social cognition and perception-action literatures are largely separate, both conceptually and empirically. However, both areas of research emphasize infants' emerging abilities to use available information--social and perceptual information, respectively--for making decisions about action. Borrowing methods from both research traditions, this study examined whether 18-month-old infants incorporate both social and perceptual information in their motor decisions. The infants' task was to determine whether to walk down slopes of varying risk levels as their mothers encouraged or discouraged walking. First, a psychophysical procedure was used to determine slopes that were safe, borderline, and risky for individual infants. Next, during a series of test trials, infants received mothers' advice about whether to walk. Infants used social information selectively: They ignored encouraging advice to walk down risky slopes and discouraging advice to avoid safe slopes, but they deferred to mothers' advice at borderline slopes. Findings indicate that 18-month-old infants correctly weigh competing sources of information when making decisions about motor action and that they rely on social information only when perceptual information is inadequate or uncertain. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

在Power builder环境下实现选矿厂微机核子秤系统的设计开发

介绍丁核子秤的基本工作原理和微机核子秤的硬件组成，介绍了在Windows2000操作系统下，用Power Builder实现系统的原理，提出了一种用微机核子秤计量选矿厂动态固体物料的方法，标定结果表明，微机核子秤的计量误差≤1％，并且用户可以方便的进行历史记录的联网查询打印，为选矿企业的办公自动化提供基础数据。     

波形分析软件在自动轨道衡监测和诊断上的应用

简要介绍了自动轨道衡波形分析软件的开发,并重点阐述了该软件在铁水动态轨道衡进行监测和诊断上的应用。     

大型球磨机衬板材质和热处理工艺的研究

在不增加贵重合金元素的前提下,设计的中碳钢SiCrMnMo成分具有足够的淬透性和淬硬性,经中温回火处理,具有硬度和韧性的良好配合.经试验,在有效厚度超过110mm、重约700kg的大型球磨机衬板上实际应用,耐磨性明显提高.     

Detection and management of foreign bodies in soft tissue

The discovery and management of foreign bodies in soft tissue are challenging problems for emergency physicians. History, physical examination, and thorough wound exploration serve as the screening test for the presence of foreign bodies. Various radiographic studies can be performed to confirm the diagnosis, to identify the object's composition and shape, and to determine its approximate location in the tissues. Once the object is discovered, the clinician must weigh the potential harm of the foreign body in its current location against the risks of attempting removal.     

电厂输煤系统皮带秤的改造及应用

通过对输煤皮带机系统的现状分析及调查 ,提出了切实可行的改造方案 ,并就方案实施过程进行了详细的论述。通过实施效果的分析 ,论证了皮带秤实物校验装置的正确选型与使用是保证电子皮带秤计量准确度及运行稳定性的必要条件。     

核子秤在高炉入包原料系统中的应用

济钢第三炼铁厂应用核子秤对高炉的入炉原料、燃料进行计量，并根据各入包原料系统的实际情况调试设定计量参数，实现了分炉计量考核，为成分分析提供了依据；同时解决了物料打错仓的问题；并可用同一秤体对不同物料进行计量。