The application rule of simple symmetrical wave signal magneto-optical modulation in spatial azimuth measurement

The purpose of the study is to summarize the application rule of sine wave and other simple symmetrical wave signal magneto-optical modulation in azimuth measurement, and acquire the limit on modulation signal when establishing azimuth measurement model. Firstly, we analyze the principle of traditional azimuth measurement system based on sine wave signal magneto-optical modulation, and establish the error free measurement model based on trigonometric function, after that we present the measurement models based on mixed signal with tangent, cosine and sine function, respectively. Secondly, we discuss the application feasibility of rectangle wave, triangle wave and sawtooth wave signal magneto-optical modulation in azimuth measurement respectively, and establish the azimuth measurement models based on rectangle wave and triangle wave signal modulation respectively, and analyze the reason why the sawtooth wave signal modulation cannot be applied in the azimuth measurement. Finally, we summarize the four simple signal magneto-optical modulation and acquire the requirements on modulation signal when establishing the azimuth measurement model based on simple wave single magneto-optical modulation. The study has an important guiding significance on the application of simple symmetrical wave magneto-optical modulation in azimuth measurement.     

The application rule of half-wave signal magneto-optical modulation in spatial azimuth measurement

The purpose of this study is to summarize the application rule of half-wave signal magneto-optical modulation in azimuth measurement, and obtain the limit on modulation signal when establishing the azimuth measurement model. After analysis on the azimuth measurement system principle, the model of modulated signal are present according to Malous law, the application feasibility of the four half-wave signal magneto-optical modulation in azimuth measurement are discussed respectively, the azimuth measurement models based on mixed signal are present, and the reason why the AC signal cannot be used to establish the azimuth measurement model is analyzed.     

New ultrasonic assisted technology of freezing,cooling and thawing in solid food processing: A review

Solid foods include fish, shrimp, shellfish, and other aquatic products, fruits, and vegetables. These products are commonly used for food freezing, cooling, and thawing. However, traditional freezing, cooling, and thawing of solid food technologies have limitations in quality, such as protein denaturation and water loss in food. Ultrasound-assisted technology has become a useful method in solid food processing due to improved preservation quality of solid food. This paper comprehensively reviews the mechanism and application of ultrasonic in solid food processing technology. Although the application of ultrasound-assisted ultrasound in solid food processing is relatively comprehensive, the energy saving of food cold processing is essential for practical application. This paper analyzes the optimization of ultrasonic in solid food processing, including orthogonal/multi-frequency technology and the combination of ultrasonic and other technologies, which provides new ideas for freezing, cooling, and thawing of solid food processing.     

木质素资源利用的研究进展

木质素作为一种大量存在的可再生资源,具有巨大的应用潜力。近年来,木质素资源的高效利用问题引起了人们的广泛关注。本文综述了近几年来国内外木质素资源利用的研究状况,简要介绍了木质素利用的两种方式:大分子形式利用以及液化降解利用。重点介绍了木质素液化降解制备生物油及酚类化合物的国内外研究现状,并对液化降解机理进行了阐述。最后,总结了当前木质素资源利用存在的问题,提出了未来木质素利用的研究方向,展望了木质素的发展前景。     

原子吸收光谱法在汽车自动变速器故障检测中的应用

研究原子吸收光谱法在汽车自动变速器故障检测中的创新性应用。通过原子吸收光谱法测定行驶里程分别为10 000～15 000,20 000～26 000,32 000～38 000,43 000～49 000,52 000～58 000km五批奥迪A6自动变速器油液(ATF)中主要金属Fe,Cu,Cr的含量,建立奥迪A6自动变速器不同行驶里程数ATF主要金属含量的数据库。研究发现主要金属含量随着汽车行驶里程数上升而增加,并且其正常含量在两条趋势线之间。测定有故障症状的ATF主要金属含量,并与其数据库数值比对,既可以判断自动变速器的磨损状况,也可以帮助汽车检测维修人员在不解体状态下诊断汽车自动变速器的故障原因,降低汽车维修成本,提高维修质量。     

基于期望视角的感知服务质量与顾客满意度区别研究

从期望出发,比较顾客视角的感知服务质量与满意度的区别。首先对期望概念进行明确界定,借鉴卡诺模型分类方法划分期望类别,基于重要性维度得到期望的三个类别:核心属性期望、重要属性期望和附加属性期望。以餐饮行业为实证研究背景,比较期望视角下的顾客满意度和感知服务质量的区别。发现核心属性期望、重要属性期望对顾客的服务质量评价影响更大,而附加属性期望对顾客的满意度评价影响更大。最后,给出企业对顾客期望、服务质量与顾客满意度的管理意义。     

光散射技术在研究高分子溶液和凝胶方面的应用

从溶液中的高分子、凝胶粒子及微乳胶粒子形态结构的表征和凝胶化过程、微乳液聚合及大分子缔合等动态过程的跟踪等方面的研究综述了近十几年来光散射技术在高分子溶液和凝胶领域的应用,并简单介绍了光散射技术的基本原理、发展简史和仪器及使用方法。     

固相微萃取-高效液相色谱联用技术的进展

固相微萃取（SPME）技术是近年来发展起来的一种无溶剂,集采样、萃取、浓缩、进样于一体的样品预处理新技术,它与同效液相色谱技术的联用已受到人们的瞩目;该文评述了SPME-HPLC联用技术的进展,并展望这一技术的应用前景。     

光色谱的进展

光色谱是近年来发展起来的利用辐射力和介质流体分离粒子的新技术,在分离和测定粒子大小及生物化学研究中有较大的应用潜力。本文对光色谱的理论、应用进展进行综述。     

沸石膜的合成、表征与应用

综述了沸石膜的合成、表征及应用。沸石膜合成最常用的方法为水热合成法,并相继发展了二次生长和微波合成法。XRD、SEM、EPMA及气体渗透为表征沸石膜常用的手段。沸石膜在分离、膜反应、催化及光学材料等方面具有广阔的应用前景。最后对沸石膜的发展进行了展望。