电能量计量系统在生产中发挥实效

为适应电力市场发展改革,加强电能量计量系统的应用已成为必然.本文探讨了湖北孝感供电公司电能量计量系统的应用中若干情况,提出进一步加强系统实用化.     

转型的能量

这是2014年的最后一个月,又到了回顾与总结的节点。 虽然每年的这个时刻,是“我们改变了世界,还是世界改变了我们”这个问题总会萦绕心头,但答案其实并不重要,因为世上不变的,唯有改变。真正值得我们探讨的是一年中那些最值得关注和思考的变革是什么,2014年,我们看到了在移动互联网大潮下,传统IT产业开始了果断的转型。     

认知特征与飞行技术水平关系的探究

本文对飞行技术的评定进行研究,然后对其人之分化进行了成套的检验,选择了80名公司飞行员,对他们的技术水平和认知能力进行了评定,从而能够分析出飞行员的认知特征与飞行水平之间存在的关系。通过对80名飞行员的认知特征和飞行技术水平之间的关系进行分析,可以看出,认知能力强的飞行员其飞行技术水平也比较高,空间认知的特征对飞行技术能够产生重要的影响,其作用能够高于言语的认知特征,从而在平时就要培养飞行员的认知能力。     

Dynamic buffering performance of the honeycomb paperboard filled with polyurethane

A new kind of composite buffering material was made by filling the voids of honeycomb paperboard with polyurethane. Drop tests were performed to evaluate the dynamic energy absorption capacity of the material. Based on the tests results, we analyzed the mechanical behaviors of the material under different conditions and obtained the inherent influencing laws of some factors on the material＇s dynamic buffering performance. It was shown that the dynamic buffering performance varied directly with impact velocity, and inversely with the void diameter, thickness and buffeting area of the composite material.     

Specific energy optimization in sawing of rocks using Taguchi approah简

This work aims at selecting optimal operating variables to obtain the minimum specific energy （SE） in sawing of rocks. A particular granite was sampled and sawn by a fully automated circular diamond sawblades. The peripheral speed, the traverse speed, the cut depth and the flow rate of cooling fluid were selected as the operating variables. Taguchi approach was adopted as a statistical design of experimental technique for optimization studies. The results were evaluated based on the analysis of variance and signal-to-noise ratio （S/N ratio）. Statistically significant operating variables and their percentage contribution to the process were also determined. Additionally, a statistical model was developed to demonstrate the relationship between SE and operating variables using regression analysis and the model was then verified. It was found that the optimal combination of operating variables for minimum SE is the peripheral speed of 25 m/s, the traverse speed of 70 cm/min, the cut depth of 2 cm and the flow rate of cooling fluid of 100 mL/s. The cut depth and traverse speed were statistically determined as the significant operating variables affecting the SE, respectively. Furthermore, the regression model results reveal that the predictive model has a high applicability for practical applications.     

压铸机铸件顶出机构的能量分析方法

运用能量观点分析了顶杆机构的稳定问题，给出了圆截面顶杆临界力能量计算公式，并通过常数Ｒ的提出，建立了能量公式与Ｅｕｌｅｒ公式的关系。通过对Ｒ的分析，设计了顶杆结构。     

一种基于HSV空间的自然图像抠图算法

自然图像抠图是指从自然图像中把前景物体抽取出来的技术。提出一种基于HSV空间的自然图像抠图算法,算法以Grab Cut为基础,利用图像HSV空间的主色波形图动态设定高斯混合模型参数,并通过引入能量函数迭代差值加快收敛。算法提高了Grab Cut在抠图中的分割效率和精度。算法应用于背景颜色较少的彩色图像,取得了较好的抠图效果。     

佳能EOS 60D数码单反相机速度释放激情的能量

数码单反相机目前遭遇到了前所未有的挑战,中端数码单反相机面对的是价位在1万元左右的中高端数码单反相机的压力。就如我们这次所测试的佳能EOS 60D,它实际上就面临着佳能EOS 7D所带来的压力。     

动力锂电池组智能管理系统设计

本文介绍了一种动力锂电池组智能管理系统的设计方案。方案以ATmega8为主控制器,除了可以对电池组在充、放电时提供有效的过充、过流、过放、温度保护外,还可以实现单节锂电池间的能量均衡,使电池组的整体性能得以充分发挥,并可以通过PC机读取保存在Flash里的历史充、放电信息。