福建省闽侯县区域农作物种植面积的空间抽样方案

基于国产GF-1号卫星影像农作物空间分布数据,以正方形网格作为抽样单元形状,综合应用遥感技术、空间抽样方法、模拟退火算法及空间自相关理论,对福建省闽侯县农作物种植面积进行估算.结果表明:根据全局自相关指数Moran’s I及其显著性指标Z Score,选取1 500 m×1 500 m作为最优单元尺寸;对研究区进行剖分,构建抽样框,对比空间随机抽样、空间系统抽样及空间分层抽样的抽样结果,空间分层抽样方法的样本容量为37,相对误差为3.86%,抽样效率最高;运用模拟退火优化算法规划野外调查的最优路径,确定空间抽样调查方案.全国统计科学研究资助项目(2015LZ18

An Overview of Marine Fluorescent Dissolved Organic Matter

海洋荧光溶解有机物(FDOM)是海洋有色溶解有机物中可产生荧光的组分,其理化性质对于海洋上层的水色遥感、光化学以及浮游植物的生产力和生态系统结构与功能等都有重要影响。总结了FDOM的3种荧光光谱分析技术及其特点,重点对其两种主要成分(类腐殖质和类蛋白质荧光物质)的荧光特性、分布变化以及来源、分布变化及其去除等进行了全面细致的综述,阐述了研究FDOM的海洋学意义,并对今后有待深入研究的重点问题作了展望。The fluorescent dissolved organic matter (FDOM) is the fluorescent component of marine chromophoric dissolved organic matter (CDOM). It has significant influence on the remote sensing, photochemistry, phytoplankton productivity and the ecosystem structure of the surface ocean. Three kinds of spectrofluorimetries for seawater FDOM were summarized and compared, with specific emphasis on three-dimensional excitation/emission matrix spectra (EEMs). The fluorescent characteristics, distribution, variation, source and transformation of the two main components of FDOM——humic-like and protein-like substances——were systematically discussed. Then, scientific questions were raised for further research, such as photochemical reaction of CDOM and its ecological effects, role of bacteria in production and transformation of CDOM, relationship between CDOM and colloidal organic carbon, and interpretation of EEMs signals.国家自然科学基金项目“典型河口生态系溶解荧光有机物质生物地球化学过程研究”(编号:40106007)资助;; 国家自然科学基金项目(No.40676046和No.40106007)资

A Preliminary Study on the Characteristics of Auditory Verb Learning among Successful Aging Elderly

目的:探索成功老龄者的记忆特征。方法:采用中国老年成套神经心理测验中听觉词汇学习测验评估65岁以上社区老人421名,其中成功老龄(SA)组230名,常态老龄(UA)组137名,轻度认知损害(MCI)组54名。结果:(1)控制年龄、性别、教育程度后,SA 与MCI、UA 与MCI 组间即刻记忆、延迟回忆保持率、倒摄抑制有显著性差异(P<0.01); 但三组间学习效应指数、前摄抑制无显著性差异。(2)对三组间七次回忆正确数进行重复测量协方差分析:SA 与UA 组组别及时间与组别交互作用均无显著性差异,但时间*组别变化趋势有显著性差异(P<0.05)。SA 与MCI、UA 与MCI 比较,组别及时间与组别交互作用、变化趋势均有显著性差异(P<0. 05)。结论:(1)延迟回忆可能是鉴别SA 较敏感的指标。(2)UA、MCI 仍具一定的学习能力,为进行成功老龄化干预提供了相关理论依据

成功老龄者听觉词汇学习特征初步研究

目的：探索成功老龄者的记忆特征。方法：采用中国老年成套神经心理测验中听觉词汇学习测验评估65岁以上社区老人421名，其中成功老龄(SA)组230名，常态老龄COA)组137名，轻度认知损害(MCI)组54名。结果：(1)控制年龄、性别、教育程度后，SA与MCI、UA与MCI组间即刻记忆、延迟回忆保持率、倒摄抑制有显著性差异(P<0．01)；但三组间学习效应指数、前摄抑制无显著性差异。(2)对三组间七次回忆正确数进行重复测量协方差分析：SA与UA组组别及时间与组别交互作用均无显著性差异，但时间^*组别变化趋势有显著性差异(P<0．05)。SA与MCI、UA与MCI比较，组别及时问与组别交互作用、变化趋势均有显著性差异(P<0．05)。结论：(1)延迟回忆可能是鉴别SA较敏感的指标。(2)UA、MCI仍具一定的学习能力，为进行成功老龄化干预提供了相关理论依据

Synthesis,Characterization and Molecular Recognition Property of Magnetic Molecularly Imprinted Polymers Microspheres with Modified Rosin as Cross-linking agent for Solid Phase Extraction of Metronidazole

本文以改性松香（马来松香丙烯酸乙二醇酯）为交联剂,采用表面印迹-悬浮聚合法制备对甲硝唑（MNZ）具有特异选择性的磁性分子印迹聚合物（MMIPs）微粒。首先在以共沉淀法合成的Fe3O4钠米粒子（Fe3O4NPs）表面包裹油酸（OA）形成Fe3O4@OA NPs;然后,以模板分子甲硝唑、功能单体甲基丙烯酸、交联剂改性松香、Fe3O4@OA NPs发生共聚合反应形成MMIPs。通过单因素实验对MMIPs的合成条件进行优化。采用场发射扫描电镜（FESEM）、傅利叶变换红外光谱（FT-IR）、振动样品磁强分析（VSM）、热重分析（TGA）和吸附实验等方法对MMIPs的形态、结构、磁性、热稳定性和分子识别特性等进行表征。结果表明MMIPs的粒径均匀,具有较强热稳定性,快速的磁响应性以及分子识别特异性;在外加磁场作用下,MMIPs可快速将甲硝唑与样品基质分离,大大提高了样品前处理的实验效率。MMIPs作为一种新型固相萃取材料,可以从化妆品样品中选择性分离和富集违规添加的甲硝唑,可应用于化妆品的安全检测。Novel MMIPs were designed and synthesized by surface-suspension polymerization using ethylene glycol maleic rosinate acrylate（ EGMRA） as the cross-linking agent in this study. First,oleic acid（ OA） was modified onto the surface of Fe3O4 NPs that were prepared by the co-precipitation. Finally,the MMIP was prepared by suspension polymerization using Fe3O4NPs@ OA as magnetic core,MNZ as the template molecule,methacrylic acid as the functional monomer,and modified rosin as the cross-linking agent. The optimal synthetic conditions were studied by single factor experiment. The morphology,magnetic,thermal stabilization and adsorption selectivity properties of the obtained MMIPs were characterized by field-emission scanning electron microscope（ SEM）,Fourier transform infrared spectrometer（ FT-IR）,vibrating sample magnetometer（ VSM）,thermal gravimetric analyzer（ TGA） and re-binding experiments. The results indicated that the MMIPs materials had uniformity particle,stronger thermal stabilization,fast magnetism response and high selective adsorption capacity. The absorbed analytes of MMIPs were quickly separated using an external magnetic field which greatly improved sample pre-treatment efficiency. The MMIPs can be used for the separation and enrichment of trace amounts of MNZ in cosmetic samples.国家自然科学基金(21165003,21545011

Using ADS to Design and Simulation of an Inverted Doherty Amplifier

基于AdVAnCEd dESIgn SySTEM(AdS)平台,通过优化偏置电压和输入功率比例改善三阶互调失真(IMd3),仿真设计一款工作于2.14 gHz频段WCdMA基站不对称功率驱动的反向dOHErTy功率放大器(IdPA).IdPA结构中接在峰值放大器补偿线后的微带线能减少功率泄露,改善输出效率.仿真结果表明,当载波放大器的栅极偏置电压为2.74 V,峰值放大器的栅极偏置电压为0.9 V并且输入功率比例为1∶2.07,输出功率为44 dbM时其功率附加效率(PAE)为25.26%,比Ab类平衡功率放大器提高了9.63%,比传统的dOHErTy功率放大器(dPA)提高了1.12%;IMd3为-40.82dbC,和Ab类平衡功率放大器相比改善了3.34 dbC.因此,这种简单结构的不对称功率驱动的IdPA实现了高效率和高线性度的良好折中,能够很好地适用于现代无线通信系统中.We use ADS platform to design and simulation of a uneven power drive inverted Doherty amplifier(IDPA).It is suitable for WCDMA base-station applications at 2.14 GHz.The inverted Doherty amplifier through the microstrip line after the peaking amplifier output network to improve power leakage and efficiency.This configuration have a good compromise of efficiency and linearity to optimum the peaking amplifier gate bias voltage at 0.9 V,carrier amplifier gate bias voltage at 2.74 V,and using 1∶2.07 uneven power drive to IDPA.At an output power of 44 dBm,the IDPA perform with 9.63% higher power-added efficiency(25.26% versus 15.63%)and 3.34 dBc better third-order intermodulation distortion(-40.82 dBc versus-37.48 dBc) than the balanced class-AB amplifier,and 1.12% higher power-added efficiency(25.26% versus 24.14%) than the conventional Doherty amplifier(DPA) does.It can indicate that this simple configuration is suitable for modern wireless communication systems

Design and application of a cable fixings for medical equipment (一种医疗设备用线路固定结构的设计与应用)

The poor management of wires may shorten the life cycle of the medical equipment and reduced work efficiency in medical workers. This paper introduced the structure and application of a cable fixings for medical equipment, which has been designed to extend the life cycle of the medical equipment and facilitate the equipment repair. (医疗设备的线路整理不及时或不当, 不仅缩短了仪器的使用周期, 也降低了医护人员的工作效率。本研究设计了一款新型医疗设备用线路固定结构, 不仅能有效延长医疗设备的使用寿命, 降低医疗成本, 同时也方便检修和使用。

沂蒙山区某村庄生物质氮资源量及其有机粮食生产潜力

农村生物质含有大量的氮素,就地肥料化既缓解环境污染问题,又能创造经济效益。该研究以沂蒙山区典型村庄蒋家庄为例,实地调查和分析了该村生物质资源量与氮含量,并利用田间试验探讨了其生产有机主粮的潜力与经济效益。结果表明,蒋家庄植物生物质量(干基)为722.5t·a~(-1),禽畜粪尿(鲜量)2703.1t·a~(-1),可降解生活垃圾(鲜基)25.4t·a~(-1),三者折合纯氮为18.88t·a~(-1)。1kg牛粪可生产1.04kg有机主粮,1kg植物生物质有机肥平均可生产0.53kg有机主粮。该村生物质氮总量可满足全村农作物有机种植需求,经济效益可增加2倍以上

准噶尔荒漠生物多样性及其与环境作用关系研究

一、项目简要说明： 准噶尔盆地荒漠是我国乃至世界温带荒漠的典型代表。本项目对准噶尔荒漠生物多样性现状进行了深入研究,对重要物种的濒危状况和生存现状进行评价,开展关键种和重要野生生物资源的保护生物学研究,并提出切实可行的保护策略;对重要生物类群之间的相互作用关系以及重要生物类群对环境的响应及适应机制进行研究。研究对于温带荒漠生物多样性的保育与可持续利用、维护生态环境安全具有重要的理论和现实意义。 出版专著2部、发表论文61篇。其中SCI收录14篇,共被引用43次;2篇被EI收录;42篇被CSCD收录,被引用66次,有两篇研究论文获奖。申请发明专利3项,软件登记1项。培养博士生..