Eutrophication in Dongtou Islands,Zhejiang and the relationships between eutrophication and red tide

根据2003年至2005年调查资料,以霓屿岛海域、三盘港海域以及竹屿岛海域为代表对浙江洞头列岛海域的水体富营养化及其与赤潮的关系进行分析研究。结果表明,丰水期水体中营养盐含量明显高于平水期,霓屿海域和三盘港海域富营养化最为严重,无机氮是水质富营养化的主要因素。富营养化和营养盐的结构是2004年5月在洞头列岛海域发生的具齿原甲藻赤潮的物质基础和首要条件,赤潮生物的生长与无机氮和无机磷存在负相关关系The seawater quality in Dongtou Islands,Zhejiang was classified and assessed according to monitor date of seawater from 2003 to 2005.The results showed that the contents of the nutrients are greater in high flow season than in low flow season.The nutrimental level in the Niyu Island and the Sanpan Island are the highest,because the inorganic nitrogen in the waters is too high.The results also showed that the eutrophication and nutrients species in the seawater are the matter bases and major conditions for red tide produced by algae in Dongtou Islands in May,2004.The relationship of the algae growth and the contents of inorganic nitrogen and phosphorus are negative.国家海洋局青年海洋科学基金项目资助(2003127);; 洞头县科技计划项目基金资助(S2003Y01

Red Tide Plankton along the South Coastal Area in Zhejiang Province

利用2002—2004年浙南海域浮游植物的多次调查资料,对发生在浙南海域常见的赤潮生物进行分析整理,为赤潮的常规监测和应急监测提供背景资料。共检测到47种赤潮生物,其中有8种曾发生过赤潮,浙南海域主要的赤潮生物有具齿原甲藻Prorocentrumdentatum、微小原甲藻Prorocentrummininum、米金裸甲藻Gymnodiniummikimotoi、夜光藻Noctilucascintillans、长耳盒形藻Biddulphiaaurita等。此外,布氏双尾藻Ditylumbrightwellii、圆海链藻Thalassiosirarotula、掌状冠盖藻Stephanopyxispalmeriana、小等刺硅鞭藻DictyochafibulafibulaEhrenberg以及一些角藻属种类等赤潮生物也存在潜在威胁。Based on the investigation data of phytoplankton from 2002 to 2004, the present situation of red tide plankton was described along the south coastal area in Zhejiang Province. It is expected to be helpful to the routine and emergency monitoring of red tide. Red tide plankton mainly include Prorocentrum dentatum, P.mininum, Gymnodinium mikimotoi, Noctiluca scintillans and Biddulphia aurita, etc. Moreover, there were potential hazards, such as Ditylum brightwellii, Thalassiosira rotula, Stephanopyxis palmeriana, Dictyochafibula fibula Ehrenberg and Chaetoceros.国家自然科学基金资助项目(40306018

Design of 0.5T magnetic resonance imaging console based on SOPC

针对磁共振成像仪控制台的数字化、小型化发展趋势,设计了一种0.5T磁共振关节成像仪控制台的总体框架。以FPGA的SOPC(System On the Programmable Chip)系统为仪器控制核心,开发了数字化磁共振成像仪控制台部分,将网络传输、数据处理、射频脉冲及梯度波形产生、外设驱动等各个功能集成在单一FPGA芯片中。实现上位机对输出波形,数字调制解调,梯度涡流补偿,抽取滤波等功能的控制。通过各个模块测试,系统功能稳定、脉冲波形可定制,为小型化磁共振成像仪的控制台研制提供了一种可靠性高而灵活的设计方案。Aiming at the development of the digitalization and miniaturization of the MRI system console,the basic structure and work flow of console for the 0.5T MRI were introduced.The consde is designed based on highly integrated SOPC system of FPGA,network communication,data processing,waveform generating is realized and peripherals in signal FPGA is controlled.Realization of tuning the wave,modulation &demodulation,gradient eddy current compensation,decimation and multiple filtering by PC.Finally the system are tested,results show that the system has the merits of high reliability,flexible pulse sequences,providing a compact and flexible scheme for MRI console.国家自然科学基金(11175149)资助项

Design of MRI communications and pulse generation module

针对小型化核磁共振成像仪主控板的功能需要提出新的设计方式,采用FPGA开发板作为主控板,以Nios II嵌入式软核作为协处理器,通过在其上移植μC/OS-Ⅱ操作系统及lwIP协议栈,实现与计算机的网络通信;使用Verilog硬件描述语言编写脉冲序列生成模块,实现对指令的解析以及执行,形成用户要求的脉冲序列。最终测试结果表明,主控板的通信速率以及通过示波器采集得到的脉冲序列均满足成像仪系统要求。而且这种软硬结合的设计方式与以往全软件的设计相比,使成像仪精度更高,性能更加稳定。To satisfy the require of the MRI main control board,this paper puts forwards a new design which uses FPGA development board as main control board and uses Nios II as a co-processor.We transplant theμC/OS-II operating system and protocol stack lwIP to achieve the network communication with computers.Then we use the hardware language Verilog to write pulse sequence generation module to achieve the analysis and execution of the command.Eventually it produces user's pulse sequence.Final test results show that the communication rate of the main control board and pulse sequence which is obtained by oscilloscope can satisfy the requirements of the MRI system.Compared with the past of the whole software design,this design make the MRI system higher precision and more stable.国家自然科学基金(11175149)资助项

纳米多孔二氧化钛空心球的水热法制备及其对Cr(Ⅵ)的吸附特性

利用水热法一步合成了TiO2.结构、形貌表征结果显示,所得产物为纯相锐钛矿型多孔空心结构,平均粒径为172nm.以此吸附剂对Cr(Ⅵ)的吸附实验结果表明,溶液pH对TiO2吸附性能影响显著,在pH为2.7时,产物最大吸附率为86%,随pH值升高,吸附率逐渐降低.其等温吸附行为很好地符合朗缪尔单分子层吸附模型,通过计算得到产物对Cr(Ⅵ)的理论最大单位吸附量为23mg/g.产物吸附Cr(Ⅵ)后,使用碱液可将吸附的Cr(Ⅵ)离子脱附,表现出了极好的重复使用性能.Cr(Ⅲ)共存对TiO2的Cr(Ⅵ)离子吸附能力没有明显影响

纳米多孔二氧化钛空心球的水热法制备及其对crvi的吸附特性

利用水热法一步合成了TiO_2．结构、形貌表征结果显示，所得产物为纯相锐钛矿型多孔空心结构，平均粒径为172 nm.以此吸附剂对Cr(VI)的吸附实验结果表明，溶液pH对TiO_2吸附性能影响显著，在pH为2.7时，产物最大吸附率为86%，随pH值升高，吸附率逐渐降低．其等温吸附行为很好地符合朗缪尔单分子层吸附模型，通过计算得到产物对Cr(VI)的理论最大单位吸附量为23 mg/g.产物吸附Cr(VI)后，使用碱液可将吸附的Cr(VI)离子脱附，表现出了极好的重复使用性能．Cr(lll)共存对TiO_2的Cr(VI)离子吸附能力没有明显影响

纳米多孔二氧化钛空心球的水热法制备及其对Cr(VI)的吸附特性

利用水热法一步合成了TiO_2．结构、形貌表征结果显示，所得产物为纯相锐钛矿型多孔空心结构，平均粒径为172 nm.以此吸附剂对Cr(VI)的吸附实验结果表明，溶液pH对TiO_2吸附性能影响显著，在pH为2.7时，产物最大吸附率为86%，随pH值升高，吸附率逐渐降低．其等温吸附行为很好地符合朗缪尔单分子层吸附模型，通过计算得到产物对Cr(VI)的理论最大单位吸附量为23 mg/g.产物吸附Cr(VI)后，使用碱液可将吸附的Cr(VI)离子脱附，表现出了极好的重复使用性能．Cr(lll)共存对TiO_2的Cr(VI)离子吸附能力没有明显影响

纳米多孔二氧化钛空心球的水热法制备及其对Cr(VI)的吸附特性

利用水热法一步合成了TiO_2．结构、形貌表征结果显示，所得产物为纯相锐钛矿型多孔空心结构，平均粒径为172 nm.以此吸附剂对Cr(VI)的吸附实验结果表明，溶液pH对TiO_2吸附性能影响显著，在pH为2.7时，产物最大吸附率为86%，随pH值升高，吸附率逐渐降低．其等温吸附行为很好地符合朗缪尔单分子层吸附模型，通过计算得到产物对Cr(VI)的理论最大单位吸附量为23 mg/g.产物吸附Cr(VI)后，使用碱液可将吸附的Cr(VI)离子脱附，表现出了极好的重复使用性能．Cr(lll)共存对TiO_2的Cr(VI)离子吸附能力没有明显影响