“圆锥的体积”教学思路及方法

教学要根据教材和学生的实际,把握教学的知识点,弄清求圆锥体积的公式与求柱体体积的异同,能较熟练地求出圆锥的体积,并运用学生掌握知识的规律,从感知小学教材内容,理解数学课本内容,巩固课堂教学知识,运用小学数学知识进行教学活动。     

舒服工作术

前几年流行的“心灵鸡汤”类的书,是教自己如何舒服的,而《找到人生好感觉》是教人如伺让别人舒服,从而使自己获得舒服的工作。     

苏联和俄罗斯的“新年好”邮资封片漫说

新年是全世界大多数国家的节日。很多国家都要发行有关的邮资票品。苏联和俄罗斯是发行这类票品品种多、数量大的国家之一。从1962年开始到苏联解体(1991年)，以至现在的俄罗斯每年都要发行一套标有СНОВЫМ ГОДМ(“新年好”或“祝贺新年”)的邮票，形成了名为“新年好”的系列邮票。除邮票外，苏联和俄罗斯还发行了品种更多、数量更大的贺年邮资信封和邮资明信片。     

食品科学与工程专业《仪器分析实验》教学改革研究

针对当前食品科学与工程专业仪器分析实验课教学的现状,指出教学过程中普遍存在的问题,结合仪器分析实验课教学的实践探索,阐述了该课程改革所取得的初步成果以及将来改革的思路和设想,以培养更为出色的应用型人才。     

Extraction of Partial Discharge Acoustic Signal by Wavelet Transform with Teager＇s Energy Operator

To develop a measurement system for monitoring partial discharge （PD） without the effect of external interferences,an algorithm of PD signal extraction based on wavelet transform with Teager＇s energy operators was presented. Acoustic signal generated by PD was selected to remove excessive interfering signals and electromagnetic interferences. Acoustic signals were collected and decomposed into I0 levels by wavelet transform into approximation and detail components. “Daubechies 25” was proved to be the most suitable mother wavelet for the extraction of PD acoustic signals. Compared with conventional wavelet denoising method, Teager＇s energy operators were adopted to the PD signal reconstruction and the signal to noise ratio was in creased by 20%-25% inthe experiment,without lost in energy and pulse amplitude.