Ultrafine Nanofiber Electrospinning and its Application in the Water Treatment

静电纺丝纳米纤维已经在过滤、传感、污染吸附、微纳能源等多个领域表现出了巨大的应用潜力，在这些应用中要求纤维的比表面积越大越好。纤维直径越小其比表面积越大，进一步细化纳米纤维，提高其均匀性和比表面积则已经成为了目前静电纺丝技术应用研究的重点。本文将针对高密度多射流静电纺丝和超细均匀纳米纤维的高效喷射制造开展研究工作，并探索纳米纤维在水体重金属污染吸附去除中的应用。 利用疏水铜网制备新型纺丝喷头，实现超细均匀纳米纤维的直接纺丝制造。疏水铜网网孔直径仅38µm，可建立多射流纺丝喷射模式，不仅降低纺丝射流直径，并增强了射流的鞭动不稳定，进一步减小了纳米纤维的直径且提高了均匀性。利用新型的...The electrospinning nanofiber has profound application potential in fields such as filtration, sensor and pollutant absorption technologies, as well as micro-nano energy. These applications require large specific surface area of the fiber for better performance, which is corresponding to small dimension of the fiber. The current researches on Electrospinning technology and application mainly focus...学位：工学博士院系专业：物理与机电工程学院_机械电子工程学号：1992007015365

Vibration measuring methods of micro-machined tunning gyroscope

结合微机械陀螺仪和隧道效应的特点,提出了角振动微机械隧道陀螺仪的工作原理和结构设计方案。针对微机械陀螺的驱动和检测在面内和面外的结构特点,制定了图像处理法、静电力阶跃激励法和机械激励法等振动特性测试方法,在大气环境下分别对隧道陀螺仪驱动和检测模态的振动特性进行了测试,得到了相应的谐振频率,采用不同的方法得到的结果基本一致。Based on the characteristics of micro-machined gyroscope and tunneling effect,the principle of operation and structure design of angular vibrating tunneling gyroscope have been introduced.Given the vibration direction of driving and sensing mode in in-plane and out-of-plane,several vibration measuring methods,including image processing,electrostatic force step stimulation and mechanism excitation,were utilized to test the vibration characteristics of the driving and sensing model of the tunneling gyroscope under the atmosphere environment,the resonance frequency and quality factor of the tunneling gyroscope were also obtained.The same results are obtained by different methods.国家自然科学基金(50675222);国家863高技术研究发展计划(2007AA04Z308);福建省高校新世纪优秀人才支持计划(2007

Coupling Effect and the Structural Schematic Design of Decoupled Micromachined Vibrated Gyroscope

微机械振动陀螺是近几年发展起来的新型惯性元件 ,其误差源主要有微机械结构的 Brown-ian噪声、电路噪声、机械耦合误差及电子机械耦合误差等 ,这些误差严重影响陀螺仪的精度 .本文提出了单级隔离耦合和双级隔离耦合的结构方案 ,有效减小机械耦合误差 ,提高精度 .Silicon micromachined gyroscope is a new type of inertial sensor developed in recent years, whose error resource often comes from brownian noise, electronic noise, mechanical coupling effects and electromechanical crosstalk , etc. These errors would affect the precision of gyroscope greatly.The structural schemes of the single decoupled and double decoupled were proposed in this paper. The mechanical coupling error could be reduced greatly and be made more precise by applying these types of structure

Structural design and performance analysis on cantilever beam micromachined tunneling gyroscope

介绍了电子隧道效应在微机械陀螺仪中的应用,根据电子隧道效应的特点与要求提出了隧道陀螺仪的结构方案,利用ANSYS进行系统模态分析、静电-结构的耦合场分析及系统的性能分析。讨论了系统的机械灵敏度及隧道电流与隧道电极间隙的关系。Application of electron tunneling effect in micromachined gyroscope is described.According to the prerequisite and characteristic of tunneling effect,a scheme of gyroscope structure is presented.Modal analysis and electrostatic-structure coupling analysis and performance analysis are described by using ANSYS software.Mechanical sensitivity and relation between the tunneling current and the distance of electrode are discussed.福建省自然科学基金资助项目(A0110003);; 福建省教育厅B类科研项目(JB03283

新工科背景下《互换性与技术测量》教学模式改革研究

针对当前《互换性与技术测量》课程教学中存在的知识点相对独立、教学过程与工程应用存在较大脱节、难以满足"新工科"背景下课程与知识创新的要求等问题,文章以成果产出为导向,开展课程内容的分层与归类,引入知识模块进行知识梳理与教学组织的重构,实现知识讲授、小组讨论、动手实践等教学环节的有机融合,完成教学闭环,提升案例教学效果。此研究可以较好地推动课程与知识创新,具有较好的实践意义。厦门理工学院2016年度教育教学改革与建设项目（JGY201601

粉煤灰颗粒的微观分类探讨

鉴于目前关于粉煤灰颗粒的微观分类没有一个普遍、清晰、浅显的分类方法,且术语不够统一的情况,为方便学术交流提出了一个新的较普遍、清晰、浅显的原状粉煤灰颗粒分类方法,使粉煤灰颗粒微观分类方法更加完善

Advances in Electrospinning Technology for Preparing Nanofibers

通过对近年来大量相关文献进行分析,在介绍最新静电纺丝技术的同时,归纳出静电纺丝技术制造纳米纤维发展的两个方向,即微观控制方向与宏观制造方向.指出微观方向发展主要集中在如何提高纳米线的定位精度与纤维均一性等微观指标的控制;宏观方向上将聚焦于如何提高纺丝效率以及丝线有序性收集等关键问题上,为静电纺丝技术进一步发展提供了新的思路.Based on the analysis of much related literature in recent years,it introduces some of the latest technologies.Meanwhile,it sums up the development of nano-fibers in the two directions,micro-direction and macro-direction.In the micro-direction,more studies will focus on improving positioning accuracy,micro-fiber uniformity and so on.In the maro-direction,spinning efficiency and orderly collection will be emphasized.This study provides a new way of thinking for further development of electrospinning technology.国家自然科学基金资助项目(E051005);广东省自然科学基金资助项目(S2011040004079);广东工业大学博士启动基金资助项目(113010);广东省引进创新科研团队资助;广东省微纳加工技术与装备重点实验室资

Direct Fabrication of Ultrafine Electrospinning Nanofiber

采用装配有疏水铜网的新型喷头研究了超细纳米纤维的制备.静电纺丝实现之前,首先对铜网进行了疏水处理,并将其安装于喷头前端.静电纺丝过程中,聚合物溶液由精密注射泵输送至喷头处.安装于喷头的铜网可将管道内的聚合物溶液分成多股细流从铜网网孔中流出.从铜网网孔流出的溶液细流受电场力作用被拉伸成多股独立射流,并从喷头携带走聚集的正电荷.受铜网表面疏水性和射流间电荷排斥力的影响,从铜网喷射出的多股射流都将保持其独立的轨迹而不会产生聚集.疏水铜网有利于减小纺丝射流的初始直径,并获得均匀的超细纳米纤维.利用新型的电纺丝喷头成功制备了直径20~80 nM的聚氧化乙烯(PEO)和聚乙烯醇(PVA)超细纳米纤维.实验结果表明,超细纳米纤维的直径随着电纺丝溶液浓度的增加而变大.A novel spinneret assembled with Cu grid was presented in this paper to fabricate ultrafine nanofiber directly.Before electrospinning,hydrophobic treatment was performed on the Cu grid,which was then fixed at the front end of spinneret.During electrospinning,the polymer solution was transferred to the spinneret by the precise syringe pump.Through the holes in the Cu grid,polymer solution flow was divided into several smaller ones.The fine liquid flow from each hole of Cu grid was stretched into individual jets by the electric field force,and the liquid jets carried away the positive charges accumulated on the spinneret.Due to the hydrophobic treatment and the charge repulsive force between charged jets,liquid jets emanated from Cu grid kept their own tracks without aggregation.The initial diameter of liquid jet was greatly decreased by the Cu grid after hydrophobic treatment,and the smaller jet led to finer uniform nanofiber.Polyethylene oxide(PEO) and polyvinyl alcohol(PVA) ultrafine nanofiber with the diameter of 20—80 nm were fabricated by this novel spinneret,and the diameter of ultrafine nanofiber increases with the increase of polymer solution concentration.国家自然科学基金重点资助项目(51035002);国家自然科学基金资助项目(50875222

Design and fabrication of bulk micromachined tunneling gyroscope with fan-shaped comb drivers

介绍了一种利用隧道效应所具有的高位移敏感特性来获得较高灵敏度的微机械隧道振动陀螺仪的设计和工艺制备,该陀螺仪分别采用扇形梳齿驱动和面外振动悬臂梁的方式实现质量块的振动和恒隧道电流的检测。介绍了扇形梳齿驱动的工作原理和隧道陀螺仪的设计。由于采用了硅玻键合和深反应离子蚀刻(drIE)的ddSOg体硅制备工艺,因而可获得较大的敏感质量块,从而使陀螺仪具有较高的灵敏度和较大的动态响应范围。根据检测模态和驱动模态匹配的原则,利用有限元模型对隧道陀螺仪的结构尺寸进行了优化,仿真结果表明,该陀螺仪在常压下的灵敏度为0 .007nM(°)/S。A bulk micromachined vibratory tunneling gyroscope which employs the high displacement sensitivity of quantum tunneling to obtain the desired resolution has been developed.The device consists of fan-shaped comb drivers which can oscillate and an out-of-plane silicon cantilever linked up to a substrate suspended by springs.Because of adopting a solid-mass silicon structure to get the larger proof mass, the new ultracompact device can provide extremely high sensitivity and a wide dynamic range.Based on the modal analysis by a Finite Element Method(FEM), the structure dimensions are optimized according to resonant frequency matching of the driving mode and the sensing mode.Simulation results demonstrate that the gyroscope owns the sensitivity of 0.007 nm(°)/s at atmospheric pressure, which also shows the Deep Dry Silicon on Glass (DDSOG) process can be used to fabricate not only the micro-machined tunneling gyroscope but also other sensors and actuators.SupportedbyFujianScienceandTechnologyPlan(GrantNo.2002H022

THE ORGANIC CARBON of PHYTOPLANKTON IN MEIZHOU BAY IN THE SUMMER

湄洲湾夏季浮游植物有机碳的调查结果表明，活体有机碳［（POC（b）］含量为42.5~185.0μg/dM3，平均值为77.5μg/dM3；POC（b）和叶绿素（CHlA）的转换系数为62.4；由三磷酸腺苷（ATP）计算所得POC（b）要比由光合作用速率（Pr）所计算的结果大。同时，同化系数（PI）的变化为0.78~2.22H-1，它的垂直变化与POC（b）分布有关。氮是湄洲湾初级生产力的限制性营养盐。The organic carbon of phytoplanktonwas measured in MeiZhou Bay in the Summer of 1992.POC(B) Content varied in 42.5￣185.0 μg/dm 3,with an average concentrtiom of 77.5 μg/dm 3.The relationship between POC(B) and chlorphyll a content can be expressed as Following,POC(B)=62.4 chla.The organic Carbon of phytophankton measured by ATP was hight than that by 14 C tracer method.The growth of phytoplankton was limited by the lack of nitrogen in Meizhon Bay.The supply and cycling of nutrients play an important role in photosynthetic index and primary productivity.福建省30万t乙烯工程环境评价水质监测研究课