388 research outputs found
The single tube quantitative rapid detection system for coliform
建立了单管定量检测食品中大肠菌群的快速检测系统。通过光子接收器采集样品在410; nm处吸光度变化数据,由固化在计算机内的程序来实现样品中大肠菌群的单管定量快速检测。结果表明,检测系统可检测出7; cfu/mL(g)样品,菌浓度在7~10~5 cfu/mL(g)范围内具有良好的线性关系。当菌浓度为7~10~5; cfu/mL(g)时所需检测时间为558 ~275; min,检测结果与国标法检测结果之间无显著差异。可满足常见食品样品大肠菌群的单管定量快速检测需求。To address the drawbacks of traditional coliform detection methods,such; as long operation time, tedious steps, huge workload and other issues,; the authorspropose a rapid, sensitive and accurate single tube; quantitative detection system for the determination of coliform in food.; The sample absorbance at 410 nm was collected by photon receiver, and; acomputer program was developed to achieve single tube quantitative; rapid detection of the coliform sample. The results show that the; detection system has high sensitivity, the limit of detection is 7; cfu/mL (g),and this system hasa good linear relationship with the; bacterial concentration in the range of 7 ~10~5 cfu/mL (g). The; detection time is only 558 ~ 275 min for the bacteria concentration of 7; ~10~5 cfu/mL (g),and no significant difference is found between the; results of this detection system and the national standard method. It; can satisfy the requirement of single tube quantitative rapid detection; of coliform in common food.福建省教育厅中青年教师教育科研项
The Analysis and Research on the Economic Foundation and Mode of the Logistics Finance in Xiamen
伴随着中小企业融资难的日益加剧,以优势互补、利益共享为主要特征的物流金融业务在中国快速生长,物流企业作为连接物流金融业务各主体的纽带,能够切实掌握商流物流真实信息,降低银企之间信息不对称问题的影响,在开展物流金融业务方面具有独特的优势。物流金融是物流发展的重要一环,也是今后物流产业发展的优势所在。 厦门市是我国最早实行对外开放的东南沿海中心城市,向来重视现代物流业的发展。随着厦门市获国务院批准建设“自贸试验区”并着力打造“21世纪海上丝绸之路”中心枢纽城市,厦门物流业的发展迎来新的挑战和机遇。厦门既有物流业的发展基础,也保有金融业良好的发展环境。基于此,研究厦门物流金融业务对于提振厦门物流经...Along with the increasing loan financing difficulties for the small and medium-sized enterprises, the logistics finance business, which is characterized by realizing complementary advantages and benefit sharing, has grown sharply in China. The logistics enterprise, a link for the respective main business bodies of the logistics finance, is capable of truly obtaining the real information of the log...学位:金融硕士院系专业:经济学院_金融硕士学号:1562013115212
Syntheses, Characterizations and Gas Sensing Properties of ZnO nanomaterials
ZnO由于氧的空位,使它具有半导体的性质,它的禁带宽度约为3.2eV,属于一种宽禁带的氧化物半导体。它在很多方面都有所应用,如气体传感器、微电子器件、光催化、水污染处理等。ZnO气体传感器可以检测各种易燃易爆、有毒有害气体,将外界非电信号转换为电信号,它是传感技术的关键,因此ZnO在气体传感器方面的应用备受人们的瞩目。在本论文中,研究了各种ZnO纳米结构的气敏性质,包括各种表面形貌的ZnO,ZnO复合材料和掺杂的ZnO,主要内容如下:1)通过热分解前驱物,如片状的碱式醋酸锌和片状甘油锌,合成了各种具有分级结构的ZnO片,而且通过简单地控制分解温度,可以得到一系列尺寸大小不一样的颗粒组成的ZnO...ZnO, known as one of the wide band metal oxide semiconductors, has a characteristic of semiconductor because of the oxygen vacancy, which has a forbidden band of about 3.2eV. ZnO has been applied in many fields, such as gas sensors, micro/nano electronic devices, photocatalysts, waste water treatment etc. Gas sensors are used for monitoring or detecting various flammable and poisonous gases. It us...学位:理学硕士院系专业:化学化工学院化学系_物理化学(含化学物理)学号:2005130190
Cultural Exchanges between Nansong-Era China and Japan : Focused on Zen monks' Exchanges
要旨 南宋時期、日中両国間における民間の文化交流は非常に活発であった。その主な理由は四つ挙げられる。第一に、両国は政治的接触がなく、故に文化交流は民間に依拠して行われる必要があったこと。第二に、南宋社会の経済的繁栄、文化的発展、安定した政治状況が、対外交流に有利であったこと。第三に、南宋政府が海外貿易を推奨しており、そのうえ日本側も対宋貿易を展開して中国の先進文化を吸収しようという思惑があったこと。第四に、南宋の造船業と航海技術が過去に増して大きく進歩し、並びに羅針盤を使用するようになった。そしてこのことが日中の海上航行の発展に繋がったのである。両国の禅僧は、学識を有した集合体としてこの時期の文化交流の主体をなし、彼らは日本における禅宗の大躍進を促進しただけでなく、建築・医薬・音楽・絵画・茶道・園林・飲食・書籍・生活習慣といった各分野においても幅広く交流を持ち、両国民に利益をもたらした。訳: 柏崎有里本文は中文併記departmental bulletin pape
南极海冰区冰藻类群及兴衰过程
本文总结了国际上对南极冰藻类群及其生理生态特性的多年研究成果 ,结合我国科学家在南极长城站以及在戴维斯和中山站的越冬研究 ,阐述了南极海冰区的冰藻类群及其形成机理 ,对冰藻的形成、存活、旺发和消亡过程进行讨论 ,并对大洋浮冰区和近岸固定冰区冰藻类群的生态特性进行对比 ,提出了今后有待进一步深入研究的领域
【英文摘要】 Combining with the research results obtained from the Great Wall and Zhongshan Stations of China, the thesis reviews the different ice algal assemblages occurring in the Antarctic sea ice and their formation, survival, growth and disappearance, compares the difference between the pack and fast sea ice zones and brings forward some scientific questions which are needed for further research. There are surface, interior, bottom and sub ice assemblages within ice, and each composes of some types. Because of ...国家自然科学基金项目 ( 30 2 70 112 ;4 0 0 0 6 0 10 )资
The progress in the study of Arctic pack ice ecology
The sea ice community plays an important role in the Arctic marine ecosystem. Because of the predicted environmental changes in the Arctic environment and specifically related to sea ice, the Arctic pack ice biota has received more attention in recent years using modern ice-breaking research vessels. Studies show that the Arctic pack ice contains a diverse biota and besides ice algae, the bacterial and protozoan biomasses can be high. Surprisingly high primary production values were observed in the pack ice..
Development and application of cup truer in advanced optical grinding
对于金刚石砂轮修整,尤其是有高精度要求的圆弧金刚石砂轮,杯形砂轮修整技术可以获得较好的砂轮磨削性能以及修整效率。本文开发了配套超精密平面磨床使用的杯形修整器,分析了其机械误差影响,并完成了修整实验及砂轮表面测量及半径拟合处理,从宏观上考察了该修整器对砂轮磨削性能的提高,结果证明该修整器可以进行有效修整,提高了加工工具精度,能满足金刚石砂轮修整使用要求。For the diamond wheel truing and dressing,especially for high precision arc diamond wheel,the GC cup truing technology is often adopted to obtain fine grinding performance and truing efficiency.This paper presents a cup truer used in surface grinding machine,and analyzes the influence of mechanical error.Truing and dressing experiments and surface measurement of grinding wheel are carried out to obtain improvement of grinding performance and accuracy.The results show that the cup truer developed can well meet the truing and dressing demand.863计划重点项目(2008AA042501);福建省科技重大专项/专题(2006HZ0002-4
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