荧光色在交通标志上的应用

荧光材料能吸收光源中的高频短波光能,通过电子能级的变迁,瞬间转换成低频长波的光能并释放出来,所以具有非常醒目、鲜艳的特点。将其与反光材料结合在一起,应用于交通标志中,极大地提高了交通标志在恶劣天气下的特别效果。通过深入阐述其在交通安全工程中的作用,并基于在国外的应用现状,展望荧光色在我国的应用前景,对荧光色交通标志的推广应用大有裨益。     

Constant Stress Accelerated Life Tests for Vacuum Fluorescent Display Based on Least Square Method

To estimate the life of vacuum fluorescent display (VFD) more accurately and reduce test time and cost, four constant stress accelerated life tests (CSALTs) were conducted on an accelerated life test model. In the model, statistical analysis of test data is achieved by applying lognormal function to describe the life distribution, and least square method (LSM) to calculate the mean value and the standard deviation of logarithm. As a result, the accelerated life equation was obtained, and then a self-develop...     

超声波均匀沉淀法制备Y2O3∶Eu3＋纳米晶及其荧光性能

在超声波作用下,使用均匀沉淀法制备了纳米Y2O3:Eu3+荧光粉,考察反应物配比、溶液pH值、反应时间、煅烧温度等制备条件对产物品粒尺寸及产率的影响.利用X射线粉末衍射(XRD)、等离子体原子发射光谱(ICP-AES)、透射电镜(TEM)和荧光光谱等测试手段表征产物,结果表明,该法制得的纳米Y2O3:Eu3+荧光粉颗粒为球形,粒度分布均匀,平均粒径约为30 nm.与微米晶相比,该纳米晶的激发光谱发生明显红移,电荷迁移态最大值(CTS)红移12 nm,发射光谱中发射主峰蓝移8 nm.     

超声波均匀沉淀法制备Y2O3∶Eu3＋纳米晶及其荧光性能

在超声波作用下,使用均匀沉淀法制备了纳米Y2O3∶Eu3＋荧光粉,考察反应物配比、溶液pH值、反应时间、煅烧温度等制备条件对产物晶粒尺寸及产率的影响.利用X射线粉末衍射（XRD）、等离子体原子发射光谱（ICP-AES）、透射电镜（TEM）和荧光光谱等测试手段表征产物,结果表明,该法制得的纳米Y2O3∶Eu3＋荧光粉颗粒为球形,粒度分布均匀,平均粒径约为30 nm.与微米晶相比,该纳米晶的激发光谱发生明显红移,电荷迁移态最大值（CTS）红移12 nm,发射光谱中发射主峰蓝移8 nm.     

皇冠图Gn,m的邻点可区别边色数

定义皇冠图Gn,m为V（Gn,m）={ui|i=1,2,…,n}∪{vi|i=1,2,…,n|∪i=1 m|uij|j=1,2,…,m},E(Gn,m)={u1u2,u2u3,…u2u1}v1v2,v2v3,…vnv1}∪{u1vi|i=1,2,…,n}∪i=1^n{∪i=1^n{uijij|j=1,2,…,m}∪i=1^n{uijui(j 1|j 1,2,…|j=1,2,…,m-1}),(n≥3,m≥1）。本文得到了Gn,m的邻点可区别边色数。     

A dual measurement method of strain and temperature

With the rapid development of China's foreign trade, the coastal and inland waterway transport has been increased rapidly. The potential market for marine engines is more and more obvious. The measurement of the engine temperature and strain becomes very important. The fluorescence fiber sensors are broadly used to measure temperature, concentration, and pH value, etc. The fluorescence sensing systems are based on different principles, namely fluorescence intensity, fluorescence intensity ratio, and fluorescence lifetime. The fluorescence lifetime is an effective parameter for sensing purpose, because it is independent of the intensity of the pumping source and does not need expensive narrow-band filters. An experiment system has been established, in which some samples were produced to measure the fluorescence lifetime and temperature characteristics and the relationship of the strain and temperature versus the fluorescence lifetime was achieved at the same time. The experiment result was fitted and analyzed. The test results show that the fluorescence lifetime decreases with the increasing of temperature. The change of fluorescence lifetime with the strain is inconspicuous comparing to that with the temperature.     

潜入蓝色空间

可曾幻想过驾驶一艘小型潜艇在海中飞行?这些类似电影场景的奇妙画面,将伴随科技的发展在不远的将来一一实现。     

SP彩色压花荧光路面施工技术

SP彩色压花荧光路面施工技术通过将SP彩色涂料喷涂于沥青表面,改变了传统沥青的黑色表面,使路面更加美观;通过沥青压花工艺,在沥青路面路口及边缘印出各种图案,既增加了道路防滑性,又使道路更具提示性和美观性;通过将荧光材料填充于预留图案中,白天兼顾装饰美观作用,夜间发出彩色荧光,大大提高了观赏性和道路行驶安全性。本文对SP彩色压花荧光路面施工技术的工艺流程及操作要点进行了阐述,可对该技术的推广应用起到一定的借鉴作用。     

高职航海类课程教学改革探索与实践

课程教学改革,是航海职业教育内涵发展的重要组成部分。文章结合参加福建省级职业院校教师教学能力的实践,以《船舶结构与货运》为例,探讨了高职航海类课程改革举措。针对学情,通过课程内容重构和教学方法改革,激发学生的学习积极性,建立“以学生为主体”互动式教学模式,探索“一门一色”的课程教学方案。