食品中亚硫酸盐使用及检测方法的研究进展     

于杰  于晓婕  王旭  丁健  李娟  李献刚 《石家庄学院学报》2011,13(3):8-13,128

亚硫酸盐是一类在食品中广泛使用却常被忽视的添加剂,不恰当的使用会对人体造成一定的损伤.笔者综述了食品中亚硫酸盐的使用及检验方法,并讨论了各种检测方法的优缺点.旨在对食品生产过程中亚硫酸盐的使用及检测起到一定的指导作用.  相似文献   

H3C以太网交换机VRP文件丢失解决方法探讨     

冷飞 《衡水学院学报》2011,13(4):40-42

探讨了Quidway3928-SI交换机发生故障后,如何备份及恢复丢失的VRP文件.  相似文献   

苯二酚在PTh/NTiO₂/GCE上的电化学行为的研究     

匡云飞  邹建陵  李玉明  许金生  冯泳兰  秦婕  谢选青  汤亚妮  郑强  谭旭 《衡阳师范学院学报》2011,32(6):70-73

该文利用循环伏安法(CV)和线性扫描溶出伏安法(LSSV)研究了对苯二酚(HQ)和间苯二酚(RS)在聚噻吩/纳米二氧化钛修饰玻碳电极(PTh/NTiO2/GCE)上的电化学行为。该修饰电极作为两种苯二酚传感器表现出极好的灵敏度和选择性。在0.2mol/L柠檬酸-磷酸氢二钠缓冲溶液(pH 4.6),RS和HQ的氧化峰电位相距508 mV,且在PTh/NTiO2/GCE上的峰比在裸GCE上的高出6.5倍。在最佳条件下,PTh/NTiO2/GCE对HQ和RS在1.0×10-7～8.0×10-6范围内都有较好的线性关系,混合物中的检出限(S/N=3)分别为3.3×10-8 mol/L和3.7×10-8 mol/L。通过计算得出了一些动力学参数如电子转移数(n),质子转移数(m)。该法被用来同时测定废水中的RS和HQ结果满意。  相似文献   

基于古诺模型的斯密悖论探究——兼评心理主义与反心理主义     

温旭 《毕节学院学报》2011,29(12):54-57

＂斯密悖论＂指斯密在《国富论》中以利己心为核心的经济人和《道德情操论》中以同情心为核心的道德人之间的矛盾。一个半世纪以来,国内外学界围绕着这一＂悖论＂的研究持续不断。借助古诺模型的方法对＂斯密悖论＂中的经济人与道德人进行博弈分析,试图提出利己与利他的有机统一体——经济道德人。  相似文献   

基于工作过程的高职物流管理专业课程体系开发     

赵保粮  宗斐  郇青  王振平 《济南职业学院学报》2011,(2)

要实现高职教育的培养目标,就应该认识到在教学中的"工作过程知识"的重要性,重视开发基于工作过程的高职专业课程体系,强调工学结合,在教学过程中采取行动导向的教学模式.为了使学生对工作过程有更加直观的认识,更加熟悉工作过程,基于工作过程的课程必须建立在校企合作的基础上,课程建设的全过程都必须是开放的,从社会需求调研、工作任务分析、学习性工作任务设计,到"双师"素质教师队伍培养均建立在校企合作的基础上.本文基于对工作过程导向的物流专业课程改革的思路和实践的研究,结合我系对物流管理专业的课程改革,对专业课程体系开发提出建议,以切实提高本专业的教学效果.  相似文献   

滨海新区现代物流基础岗位人才需求与教育衔接的研究     

王莹  张旭  李金东 《天津职业院校联合学报》2011,13(2):37-39

近年来,滨海新区经济一直保持稳步上涨趋势。通过调查研究发现企业人才需求,与现在高职教育不能实现完全对接。通过分析企业对人才的能力要求,找出目前高职教学计划、教学方法的不当之处,建议构建"一体两翼"式的课程体系、推进"2+1"教学模式等措施,强化高职生能力素质,进而培养出适应滨海新区经济发展需要的实用型人才。  相似文献   

Comparison of different techniques for time-frequency analysis of internal combustion engine vibration signals     

Yang Jin  Zhi-yong Hao  Xu Zheng 《浙江大学学报(A卷英文版)》2011,12(7):519-531

In this study, we report an analysis of cylinder head vibration signals at a steady engine speed using short-time Fourier transform (STFT). Three popular time-frequency analysis techniques, i.e., STFT, analytic wavelet transform (AWT) and S transform (ST), have been examined. AWT and ST are often applied in engine signal analyses. In particular, an AWT expression in terms of the quality factor Q and an analytical relationship between ST and AWT have been derived. The time-frequency resolution of a Gaussian function windowed STFT was studied via numerical simulation. Based on the simulation, the empirical limits for the lowest distinguishable frequency as well as the time and frequency resolutions were determined. These can provide insights for window width selection, spectrogram interpretation and artifact identification. Gaussian function windowed STFTs were applied to some cylinder head vibration signals. The spectrograms of the same signals from ST and AWT were also determined for comparison. The results indicate that the uniform resolution feature of STFT is not necessarily a disadvantage for time-frequency analysis of vibration signals when the engine is in stationary state because it can more accurately localize the frequency components excited by transient excitations without much loss of time resolution.  相似文献   

Dynamic responses of cable-stayed bridges to vehicular loading including the effects of the local vibration of cables     

He Zhang  Xu Xie 《浙江大学学报(A卷英文版)》2011,12(8):593-604

Stay cables, the primary load carrying components of cable-stayed bridges (CSBs), are characterised by high flexibility which increases with the span of the bridge. This makes stay cables vulnerable to local vibrations which may have significant effects on the dynamic responses of long-span CSBs. Hence, it is essential to account for these effects in the assessment of the dynamics CSBs. In this paper, the dynamic responses of CSBs under vehicular loads are studied using the finite element method (FEM), while the local vibration of stay cables is analyzed using the substructure method. A case study of a cable-stayed steel bridge with a center span of 448 m demonstrates that stay cables undergo large displacements in the primary mode of the whole bridge although, in general, a cable’s local vibrations are not obvious. The road surface roughness has significant effects on the interaction force between the deck and vehicle but little effect on the global response of the bridge. Load impact factors of the main girder and tower are small, and the impact factors of the tension of cables are larger than those of the displacements of girders and towers.  相似文献   

高职教育实践教学体系要素构建研究     

韩叙 《天津职业院校联合学报》2011,13(10):20-23

文章探讨了高职教育实践教学体系的特征,构建高职实践教学体系的原则,阐述了高职实践教学体系的构成要素,构建实践教学体系应注意的几个环节。  相似文献   

Exploring the cosmopolitanism in China: examining mosheng ren (“the stranger”) communication through Momo     

Deya Xu 《Critical Studies in Media Communication》2019,36(2):122-139

This paper discusses a phenomenon that has become popular in mainland China in recent years, “mosheng ren communication,” focusing specifically on an application known as Momo, a social discovery and dating platform that is widely used in China. It first outlines the context of post-Mao China, which has produced urbanism, individualization, and a sexual revolution. Thereafter, it turns to the theories of the stranger and cosmopolitanism, which are used to analyze mosheng ren communication. This paper adopts cultural discourse analysis as the analytical procedure to present the findings of online and offline interviews conducted in both Beijing and Shanghai to examine how Momo users in urban metropolises make use of this app in order to analyze the cultural radiants in their communication practices. Based on the data obtained, this paper analyzes mosheng ren communication in the Chinese context and describes how Momo is designed to facilitate it. Momo users can enter into sexual relations based on the use of authentic photos on their profiles; alternatively, they can communicate anonymously. They are also “in-between” traditional Chinese values and new values. Momo users contribute a Chinese form of cosmopolitanism through cultivation of insensitivity to mosheng ren, while their engagement in mosheng ren communication implies that the members of are more open to others.  相似文献