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矿井提升机为保证安全运行均装没有提升过卷保护装置,一般过卷保护工作原理为:深度指示器在提升过程中指示提升容器的位置,在容器接近终端位置时发出减速信号,在提升过卷时,切断安全回路,进行安全制动。 相似文献
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北美的门窗热工性能认证 总被引:1,自引:0,他引:1
本文综述了NFRC和"能源之星"对门窗热工性能认证要求、热效标识和北美对采用节能门窗的激励措施. 相似文献
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Juankun Zhang Min Li Peidong XuShuhai Jiang Yuliang LiuYi Chen Lijuan LiuZuoliang Sha 《Materials Science and Engineering: B》2013,178(18):1191-1194
A novel biosensor (the synthetic receptor sensor) employing the molecular imprinted technology for the digoxin analysis is investigated. The molecularly imprinted polymer (MIP) modified electrode can specifically bind to the analyte in the sample without sample pretreatment. The digoxin analyzed by the MIP sensor was carried out in 1 mM K3Fe(CN)6 solution with the cyclic voltammetry. In the system, the K3Fe(CN)63−/Fe2(CN)64− redox couple was taking place. When the solution contains the digoxin, the MIP on the electrode will bind the digoxin. Further the redox system is interrupted and the peak current is decreased according to the digoxin concentration increasing. Digoxin is a glycosylated steroid-like drug. It is important for the heart disease treatment. However, since the digoxin toxic level is low, the drug remains in the blood sample must be monitored frequently. The device possesses many advantages, such as high specific recognition properties, good chemical and mechanical stability, simplicity and low cost of preparation, sensitive and label free determination. The reproducibility is good (CV < 5). The linear relationship between the digoxin concentration and the current is 1.28–128 nM, and a detection limit of 1.28 nM is achieved. The detection time is less than 5 min. 相似文献
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《Journal of Visual Languages and Computing》2014,25(6):891-902
Augmented reality (AR) by a projector allows for the easy association of information by labeling the objects. When a projector is installed above a workspace and pointed downward, supportive information can be presented; however, the label will be deformed if the object is nonplanar. Also, a label might be projected in a region where it is hidden by the object, i.e., a blind area. In this paper, we propose a view management technique to allow interpretation by improving the legibility of the information. We propose the nonoverlapped gradient descent (NGD) method, which determines the position of a newly added label by avoiding overlap with the surrounding labels and linkage lines. The issues of presenting in a shadow or blind area are also addressed by estimating these areas based on the approximation of objects as a simple solid. The results of an experiment show that the visibility of the labels was improved by using this method. 相似文献
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纺织厂用组合式中央空调机组,当工艺送风机出现故障时,用环境风机代替工艺风机的无干扰切换。结果表明:当工艺风机出现故障,人为手动无干扰切换,用环境风机代替工艺风机,环境风温与风压均能满足工艺送风要求,停下工艺风机进行故障维修处理,满足生产工艺要求。 相似文献
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This paper proposes a new and reliable segmentation approach based on a fusion framework for combining multiple region-based segmentation maps (with any number of regions) to provide a final improved (i.e., accurate and consistent) segmentation result. The core of this new combination model is based on a consensus (cost) function derived from the recent information Theory based variation of information criterion, proposed by Meila, and allowing to quantify the amount of information that is lost or gained in changing from one clustering to another. In this case, the resulting consensus energy-based segmentation fusion model can be efficiently optimized by exploiting an iterative steepest local energy descent strategy combined with a connectivity constraint. This new framework of segmentation combination, relying on the fusion of inaccurate, quickly and roughly calculated, spatial clustering results, emerges as an appealing alternative to the use of complex segmentation models existing nowadays. Experiments on the Berkeley Segmentation Dataset show that the proposed fusion framework compares favorably to previous techniques in terms of reliability scores. 相似文献
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Stefan Schuler 《电源世界》2012,(1):50-52,44
本文对IGBT开关性能的提高进行了分析研究,分析了关断控制、直流母线和模块等因素的影响,可以通过选择合适的开关速度、吸收电容和合理的模块设计改进开关性能。 相似文献