Mixing Effect of Two-Dimensional Micromixers Based on the Deformed Square-Wave

设计并制作了多种二维变形方波微混合器,通过荧光观测及标准偏差数值分析,在低rE数(rE≤13.33)时,考察拐角和单元长度对混合器混合效果的影响。结果表明,集成拐角的混合器存在一个临界rE值1.3,当rE1.3时,可以产生回流,混合效率随着拐角的减小逐渐提高。对于集成6个单元、拐角为45°、单元长度(S)为3132μM的微混合器,在雷诺系数rE=13.33时,混合效率为56%,约提高了1倍;但当拐角与混合单元长度增大时,混合效率明显降低。A series of two-dimensional micromixers based on the deformed square-wave were designed and fabricated.The effect of the turning angle and unit length on the mixing efficiency at low Reynolds number(Re≤13.33)was investigated by fluorescence observation and numerical analysis of the standard deviation from the pixel intensity distribution.The results indicate that the mixer with the integrated turning angle has a critical Reynolds value of 1.3.The mixture only depends on the molecular diffusion and the mixing efficiencies remained at about 28% when Re1.3.For the micromixer of six square-wave units with 45° turning angle and 3 132 μm unit length,the mixing efficiency is increased to 56% at Re=13.33.However,the mixing efficiency is decreased with turning angle and unit length increasing.国家基础科学人才培养基金资助项目(J0630429);福建省自然科学基金计划项目(D0740013);集美大学科研基金资助项目(ZQ2007001

Development of Multi-excitation Wavelength Fluorescence Detector for Shipboard Phytoplankton Detection

水体中叶绿素a（Chlorophylla，Chla）浓度、浮游植物分类是水质监测、初级生产力估算、水色遥感反演等所需的基础数据。Chla的总浓度是表征水体中浮游植物浓度的主要指标，也是目前浮游植物现场测定的主要参数。浮游植物浓度测定方法主要有荧光光谱法、分光光度法，测定过程一般都是在实验室进行，使用光学系统复杂的商品化仪器，测定过程对温度/湿度的要求严格。因此，现有的实验室仪器很难满足船载/车载或现场分析的要求。本文基于浮游植物色素的激发光谱和荧光光谱特性，以及模块化设计思想，研制了以发光二极管（LightEmittedDiodes，LED）为激发光源、流动注射为进样方式的船载浮游植物多激发波...Determination of Chlorophyll a (Chl a) and differentiation of phytoplankton in water can provide valuable information for monitoring of algae blooms and water quality, primary productivity estimation and remote sensing retrieval. Detecting total Chl a concentration as phytoplankton concentration is a main method of phytoplankton in-situ determination. Generally, fluorescence spectroscopy and spect...学位：理学硕士院系专业：海洋与环境学院_海洋化学学号：2242010115131

基于液芯波导的船载CDOM测量系统的设计和航次考察

有色溶解有机物(CdOM)是海水中溶解有机物的主要成分之一,由于它强烈吸收紫外光和蓝光,对海洋的水色产生影响,是研究自然生态系统、水色遥感、水体碳循环的重要因素。实验设计并搭建了基于液芯波导(lCW)的CdOM测量系统。系统主要由光源、光纤、液芯波导流通池、蠕动泵和微型光谱仪构成。对九龙江河口近岸盐度0~30梯度范围内16个站位的表层水样进行采样,并用本系统进行现场分析,获得各个站位水样的吸收光谱,计算CdOM吸收系数A和指数拟合后的光谱斜率S与实验室CAry 100bIO分光光度计的测定结果比较。本系统所测A(355nM)的范围为0.52~2.47M--(-1),CAry100bIO测得A(355nM)的范围为平行样品0.47~2.45M--(-1)。现场与实验室测量所得吸收系数基本一致(r=0.96),说明本系统适用于海上船载分析测量CdOM的吸收光谱

Design of shipborne CDOM determining system based on liquid core waveguide and voyage evalution

有色溶解有机物(CdOM)是海水中溶解有机物的主要成分之一,由于它强烈吸收紫外光和蓝光,对海洋的水色产生影响,是研究自然生态系统、水色遥感、水体碳循环的重要因素。实验设计并搭建了基于液芯波导(lCW)的CdOM测量系统。系统主要由光源、光纤、液芯波导流通池、蠕动泵和微型光谱仪构成。对九龙江河口近岸盐度0~30梯度范围内16个站位的表层水样进行采样,并用本系统进行现场分析,获得各个站位水样的吸收光谱,计算CdOM吸收系数A和指数拟合后的光谱斜率S与CAry 100bIO分光光度计的测定结果比较。本系统测定355 nM处的吸收系数A(355nM)作为CdOM的丰度指数,其范围为0.52~2.47M--(-1),CAry100bIO测定A(355nM)的范围为0.47~2.45M--(-1)。现场与实验室测量所得吸收系数基本一致(r--2=0.996),说明本系统适用于海上船载分析测量CdOM的吸收光谱。Colored dissolved organic matter(CDOM) is a major component of dissolved organic matter(DOM) in seawater.Due to intensely absorbing UV and blue light and influencing the color of seawater,it is key factor to nature ecosystem,water color remote sensing and carbon cycle investigation.A CDOM determining system was designed and fabricated.The system mainly consists of light source,fiber,liquid core waveguide(LCW) flow cell and micro spectrometer.We took the surface water samples from 16 sites near coast of Jiulongjiang estuary where the salinity ranging from 0 to 30.We used our instrument to analyze the samples simultaneously on ship to obtain their absorption spectra,calculate the CDOM absorption coefficients and the slope of the log-linearized absorption spectra,and compared the data with the values using a cary 100 spectrometer.The dynamic range of a(355nm),as the abundance of CDOM,for our LCW measurement was 0.52 - 2.47m-1,while for cary 100 it was 0.47 - 2.45m-1.Correlation between in situ measured CDOM and the laboratory measurement was high,R2 = 0.996.These results support the conclusion that the system is suitable for determining CDOM absorption spectrum on ship.国家高技术研究发展计划(863计划)(No.2008AA09Z108

Y-shaped electric -field free electro -osmotic pump with small sub -channels in parallel

设计并制作了一种y型无电场电渗泵芯片,以聚电解质静电自组装技术在侧臂通道分别修饰正、负电荷形成电渗泵,实现中间主通道无电场干扰。侧臂由多个平行亚通道构成,以增强电渗泵流速。使用中性离子示踪法、毛细管法分别测定电渗泵流速与压强,考察了电场、亚通道个数及深度对流速与压强的影响。结果表明,流速、压强随外加电场增大而增大,并呈线性关系;流速随侧臂亚通道个数增大而增大,压强随通道深度减小而增大。当电场强度为600V/CM时,含9个深10μM、宽度25μM亚通道的电渗泵流速与压强分别为672nl/MIn和442PA。A novel Y-shaped electro-osmotic pump consisting of two arms which has small sub-channels in parallel was developed.Two arm-channels were modified with cationic and anio-nic polyelectrolyte respectively,allowing a field-free flow to be generated in main-channel.Flow rate and pressure were measured by particle tracking and capillary method respectively,and the influence of electric field, numbers and depth of sub-channel on flow rate and pressure was investigated as well.Results showed that both of flow rate and pumping pressure increased linearly with electric field.As the number of subchannels increases,the flow rate becomes higher by increasing the cross-sectional area at a constant electric field.Meanwhile,the pressure falls as depth of sub-channel increases.Flow rate and pumping pressure were 672nL/min and 442Pa respectively for the pump with 9 sub-channels(10am deep、25μm wide)in parallel,when electric field was 600V/cm.国家自然科学基金面上项目20675066;国家基础科学人才培养基金J0630429项目资