Characterization of a bioflocculant from a newly isolated Vagococcus sp. W31   总被引：6，自引：0，他引：6  

Gao J  Bao HY  Xin MX  Liu YX  Li Q  Zhang YF 《Journal of Zhejiang University. Science. B》2006,7(3):186-192

INTRODUCTION Bioflocculation is a dynamic process resulting from the synthesis of extracellular polymer by living cells. Since flocculation in microbial system was first reported by Louis Pasteur (Salehizadeh and Sho-jaosadati, 2001), bioflocculation has been investi-gated extensively and a correlation was established between the accumulation of extracellular biofloccu-lants and cell aggregation (Tenney and Verhoff, 1973). Bioflocculants are essentially polymers pro-duced by microorgan…  相似文献   

近红外光谱分析技术的研究与应用     

杨琼  项瑜  杨季冬 《四川三峡学院学报》2013,(3):89-91

基于重庆市高校创新团队＂近红外光谱检测技术研究及其应用＂的建设与发展,重点介绍了近红外光谱分析技术的发展,研究了近红外光谱分析技术在三峡库区特色资源的快速检测的应用.  相似文献   

基于分形的快速最大熵红外图像特征检测     

谭晓静 《重庆师专学报》2013,(5):119-123

文章针对红外图像目标检测问题,提出一种基于分形的快速最大熵的红外图像特征检测算法.该算法利用DBC方法计算分维数,根据人造物和自然背景分形维差异,确定目标区域;最后,通过二维最大熵原则确定最佳阈值,实现对单目标或者多目标图像分割.该算法能够较好实现红外图像特征检测,有效抑制背景和噪声.  相似文献   

电动书架控制系统的设计与实现     

梁盈富 《金华职业技术学院学报》2013,13(3):44-47

针对设计的一种电动书架,开发了其电气控制装置,使书架能够实现旋转运动、上下移动、到位检测和报警功能。完成了该书架控制系统的软件和硬件设计,对书架的运动控制采用红外遥控的控制方式,编制了遥控解码程序。结果表明,该控制系统能够使书架稳定运行,为人们的使用提供了极大的方便。  相似文献   

8种杀菌剂对苦瓜枯萎病菌的室内毒力测定   总被引：1，自引：0，他引：1  

何美仙  罗军 《金华职业技术学院学报》2013,13(3):83-85

采用生长速率测定法和分生孢子萌发抑制率法,在舍药PDA平板上和凹玻片上分别测定8种杀菌剂对苦瓜枯萎病尖孢镰刀菌的毒力作用。结果表明：20％五氯硝基苯DP对菌丝生长的抑制作用最强,EC50值为8．37mg／L,其次为40％五硝·多菌灵WP、12．5％戊唑醇WP、50％多菌灵WP和75％百菌清、聊,EC50值分别为：10．61mg／L、10．65mg／L、12．62mg／L、15．40mg／L。12．5％戊唑醇WP和对孢子萌发抑制作用最强,EC50值为3．68,20％五氯硝基苯DP、25％腈菌唑EC、40％五硝·多菌灵Ⅵ巾、50％多菌灵WP次之,EC50值分别为4．81mg／L、8．51mg／L、9．90mg／L、11．17mg／L。  相似文献   

基于HN911的红外线报警系统     

周海波 《长江工程职业技术学院学报》2008,25(3):55-57

阐述了被动式红外线热释电传感器的工作原理,并介绍了一种基于HN911的实用红外线报警系统的结构及原理。  相似文献   

Nineteenth century chrome yellow and chrome deep from Winsor & NewtonTM     

Vanessa Otero  Joana V. Pinto  Leslie Carlyle  Márcia Vilarigues  Marine Cotte 《文物保护研究》2017,62(3):123-149

The Winsor & Newton^TM (W&N) nineteenth century archive database includes digitised images of hand-written instructions and workshop notes for the manufacture of their artists’ materials. For the first time, all 183 production records for yellow lead chromate pigments were studied and evaluated. They revealed that W&N produced essentially three pigment types: lemon/pale based on mixed crystals of lead chromate and lead sulphate [Pb(Cr,S)O₄]; middle on pure monoclinic lead chromate [PbCrO₄]; and deep that contains the latter admixed with basic lead chromate [Pb₂CrO₅]; accounting for 53, 22, and 21% of the production, respectively. Production records for primrose (4%) were also included since the formulation results in mixed crystals with a high percentage of lead sulphate, which, according to the literature, leaves it more prone to degradation. Each pigment type is characterised by only one or two main synthetic pathways; process variations reveal a systematic and thorough search for a high-quality durable product. A comparison of the chemical composition of pigment reconstructions with early W&N oil paint tubes showed that their records entitled ‘pale’ and ‘lemon’ correlated with the pigment in their tube labelled chrome yellow and, ‘middle’ and ‘deep’ with the label chrome deep. Lemon and middle pigment formulations were made into oil paints to assess their relative photo-stability. The degradation process was followed by colorimetry and was studied by synchrotron radiation-based techniques. Based on the X-ray absorption spectroscopy data, the possibility for creating a stability index for chrome yellows is discussed.  相似文献   

红外光谱Excel处理技术及其应用     

庞新安 《实验技术与管理》2007,24(6):71-73

红外光谱技术是一种高效、快速的现代分析技术,而Microsoft Excel是一个功能强大的数据处理软件,两者均在很多领域得到了广泛应用。该文利用苯甲酸红外光谱实验数据为操作对象,介绍了用Mi-crosoft Excel软件处理该类型实验数据的详细步骤,包括数据引用方法、图表绘制及其修饰等相关技术。  相似文献   

人流量统计系统设计   总被引：2，自引：0，他引：2  

何小映  何红 《中国科技信息》2007,(14):97-98

本统计系统用于统计某个超市的客源流量。该系统具有智能功能,一方面能适时统计该超市的实际人数,自动判断顾客是进入还是离开超市,如果进入则进行加计数,相反则进行减计数,计得的人数通过显示器显示出来。另一方面能统计某天进入超市的总人数,而且能将每天的人流量保存起来,供需要时查询。该系统具有结构简单、成本低廉、计数准确的特点。不仅适用于超市,还适用于其它需要进行人数统计的场合。  相似文献   

Local Spiral Curves Simulating Based on Hough Transformation and Center Auto-Locating of Developing Typhoon     

王萍郭传澍  罗颖昕 《天津大学学报(英文版)》2006,12(2):142-146

In the developing phase of typhoon formation, the spiral belt partly emerges in satellite cloud images. This research starts from images and moves on to graphics and then to representation and recognition. Following this route, local spiral cloud belt is segmented from the raw images using image segmentation, the spiral information is extracted using mathematic morphology, and local spiral curves are detected using Hough transformation. The problem of center locating of developing typhoon has finally been solved through a search algorithm of spiral curve. For No. 99082008 cloud image, the result produced by the algorithm in this paper is at 122. 3 degree west longitude, 17.5 degree north latitude. The real typhoon center location was at 122.4 degree west longitude, 18 degree north latitude.  相似文献