试论电气动生产设备的养护与使用

现代生产设备的研制与应用使得生产自动化程度不断提高,为企业生产能力的提高、生产成本的降低奠定了良好的基础.作为现代自动化生产设备的重要类型,电气动生产设备的养护与使用关系到企业的生产安全、关系到企业生产工作的顺利开展、关系到企业产品供应能力的持续与稳定.本文针对电气动生产设备特点对设备的养护与使用进行了简要论述.     

介值定理在解题中的应用

本文通过实例介绍了介值定理在解不等式及证明方程根的存在性中的应用。     

龚自珍谱学理论初探

龚自珍是清代著名的思想家、文学家、史学家及改良主义的先驱者。学界对龚自珍史学的多个领域都有较为深入的研究,唯其族谱之学,鲜有人涉及。其以《怀宁王氏族谱序》和《徽州府志氏族表序》为代表的＂欲其子若孙之贤＂和＂不以宗废贵贵与贤贤＂的谱学观念,在迄今为止的谱学著述中实为难能可贵之见解。本文拟从龚氏所著的谱序资料入手,探讨其谱学思想及其举因。     

钛基铱钽氧化物阳极用于电合成丁二酸的应用研究

以自制的Ti/IrO2＋Ta2O5电极为析氧阳极,以铅为阴极,开展电还原顺丁烯二酸以合成丁二酸的实验研究。结果表明,与传统的铅阳极相比,该电极直流电耗低、寿命长、产品收率有所提高。     

《寡人之于国也》中的“之”字用法辨析

人教版第一册节选《孟子·梁惠王上》中一段,题为《寡人之于国也》,文中寡人之于国也,尽心焉耳矣一句中之的用法,很让人玩味。查教参,没有专门提出来讲。翻阅王力主编的《古代汉语》(中华书局出版)第二册42页解释为之是介词,用在主语和介宾词组之     

“活动课”在初中物理教学中的尝试

在初中物理教学活动中引入"活动课",变死课堂为活教室,让同学们在动手中动脑,实践中益智,取得了较好明显的教学效果.摩擦起电现象把人们的视野引入了电学的世界,但对于初电学之门的学生来说,这无疑是一个很抽象的知识点.面对人类内眼看不见的原子结构,将如何了解摩擦起电的原因和本质呢?通过课本知识,我们可以得到以下三个加强点:①在通常情况下,原子是中性的,由原子组成的物体也是中性的.②不同原子核对电子束缚本领不同.③物体失去电子带正电,得到电子带负电.     

明天新鲜事

明天新鲜事精彩直播中……妈妈被克隆了;一觉醒来,枕边放着能飞行的超人服;校园实践教育让我们乐翻天;发电工厂成了大家的运动乐园;魔法小人正在招收小学徒。迎着和煦的春风,带着无比激动的心情开始我们的新鲜之旅吧!     

Effects of La^3＋on microwave dielectric properties of（Pb0.5Ca0.5）（Fe0.5Ta0.5）O3ceramics

This work investigated the microwave dielectric properties of A-site substitution by rare earth La3+in(Pb0.5Ca0.5)(Fe0.5Ta0.5)O3(PCFT) system.A single perovskite phase was obtained only when the doping content was 2%.Suitable La3+ doping improved microwave dielectric performances.Excessive La3+doping caused the formation of secondary phase,which resulted in the decreasing of permittivity εrand quality factor Qfvalues.Especially,when the doping content is 2%-5%,permittivity εrwas above 75 and Qfvalues were 6...     

Extraction of novel features for emotion recognition

Hilbert-Huang transform method has been widely utilized from its inception because of the superiority in varieties of areas. The Hilbert spectrum thus obtained is able to reflect the distribution of the signal energy in a number of scales accurately. In this paper, a novel feature called ECC is proposed via feature extraction of the Hilbert energy spectrum which describes the distribution of the instantaneous energy. The experimental results conspicuously demonstrate that ECC outperforms the traditional short-term average energy. Combination of the ECC with mel frequency cepstral coefficients (MFCC) delineates the distribution of energy in the time domain and frequency domain, and the features of this group achieve a better recognition effect compared with the feature combination of the short-term average energy, pitch and MFCC. Afterwards, further improvements of ECC are developed. TECC is gained by combining ECC with the teager energy operator, and EFCC is obtained by introducing the instantaneous frequency to the energy. In the experiments, seven status of emotion are selected to be recognized and the highest recognition rate 83.57% is achieved within the classification accuracy of boredom reaching 100%. The numerical results indicate that the proposed features ECC, TECC and EFCC can improve the performance of speech emotion recognition substantially.     

一种基于能量谱葡萄糖浓度检测新方法的研究

葡萄糖浓度检测在治疗糖尿病过程中起着重要作用,采用近红外光谱方法测量葡萄糖浓度是国内外研究的热点．通过实验的方法,用800nm到1600nm的近红外光照射葡萄糖水溶液,对不同葡萄糖浓度对应的能量谱进行分析,发现在1111nm处的吸收峰特征比较明显,与葡萄糖浓度有着对应的关系,通过指数曲线拟合,建立葡萄糖浓度检测的数学模型．