The Atmospheric Mercury Pollution Survey During Autumn and Winter Seasons in Xiamen

文章采用两次金汞齐-冷原子荧光光谱法对厦门地区秋冬季节大气汞的污染状况作了初步调查分析,结果表明厦门地区大气中汞的浓度平均为11.037 ng/M3,其含量高于北半球大气气态总汞含量的背景值(1.5--2.0 ng/M3),表明该地区已受到一定程度的大气汞污染;在一定的采样区域,大气汞浓度与温度、太阳辐射量、大气压、空气湿度成正相关,与风速成负相关;气态汞的含量在80%左右,这与该地区的人为活动多有关,与其他地区报道的类似区域情况的汞污染状况相符;工业区,学校实验室周边区域,生产过程中以汞为原料的工厂等附近区域,大气中汞的含量较高,开阔区域的海边含量较低,交通繁忙区域最低(所选采样点与交通要道有一定的距离),这种浓度分布说明了大气中汞的存在具有区域性特征。In this paper,the atmospheric mercury pollution during autumn and winter seasons in Xiamen was analyzed with the method of two-stage gold amalgamation-cold vapor atomic fluorescence spectroscopy.The results show that the average concentration of atmospheric mercury in Xiamen is 11.037ng/m3,which is higher than the background value(1.5ng/m3--2.0ng/m3) of the atmospheric mercury in the northern hemisphere.It indicates that there is a certain degree of mercury pollution in Xiamen.there is a positive relationship between mercury concentration and temperature、solar radiation、atmospheric pressure and humidity,while there is a negative relationship between mercury concentration and wind speed.The content of gaseous mercury in Xiamen is about 80%,which shows analogous level compared to the mercury concentration in other areas.The high content of gaseous mercury in Xiamen maybe related to the human activities.The mercury concentration is high in some regions such as industrial zone,areas around school laboratories,factories which use mercury as raw materials,while the mercury concentration is a little lower in the open area of the seaside,and the mercury concentration is the lowest in traffic busy areas(there is some distance between sampling locations and traffic busy in this study).The distribution of mercury concentration indicates that there is a regional character of atmospheric mercury in Xiamen

Effect of Loading Content of Silver on Lithium Storage for TiO2 Net-Work Flexible Film Electrode

采用水热法结合银镜反应制备出一系列不同Ag负载量(2.2%、4.0%、6.4%,; w/w)改性的3D纳米网状结构Ag@TiO_2薄膜电极。利用电感耦合等离子体技术(ICP)、X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(; TEM)和X射线能谱(EDX)等表征手段测试所合成材料的形貌及成分,实验结果表明Ag纳米颗粒可以成功沉积在TiO_2纳米线表面。电化学测试数据则; 表明,4.0%(w/w)负载量的Ag@TiO_2相比于未改性和其他负载量的TiO_2纳米线具有更好的倍率性能和更稳定的可逆容量。在50,100,; 200, 400, 800和1 200 mA·g~(-1)的电流密度条件下,该改性电极的放电容量可分别达到261.4,253.7,239.5,; 216.5, 193.1和185.1 mAh·g~(-1),在200 mA·g~(-1)下循环80次后容量保持率仍能达到99.8%。A series of silver-modified TiO(2)flexible film electrodes with hierarchical 3D nano-network structure are facilely synthesized using hydrothermal method followed via the traditional silver mirror reaction. Successful deposition of Ag nanoparticles on to the TiO2 nanowires surface is confirmed by inductively coupled plasma (ICP) technique, X-ray diffraction (XRD), scanning electron microscope (SEM) with energy-dispersive X-ray analysis (EDX) and transmission electron microscopy (TEM). The electrochemical properties of the Ag@TiO2 nanowires were researched in this work. Our results show that the Ag@TiO2 nanowires with 4.0% (w/w) silver exhibits a better rate performance and more excellent reversibility than pristine one. At different current densities of 50, 100, 200, 400, 800 and 1 200 mA . g(-1), the discharge capacities of the Ag@TiO2 electrodes are 261.4, 253.7, 239.5, 216.5, 193.1 and 185.1 mAh . g(-1), respectively. After 80 cycles at 200 mA . g(-1), its discharge capacity retention is 99.8% indicating Ag@TiO(2)electrodes are potentially useful for LIBs.国家自然科学基金(N0.51604132）资助项目

银负载量对网状TiO柔性薄膜电极储锂性能的影响

采用水热法结合银镜反应制备出一系列不同Ag负载量（2.2%、4.0%、6.4%,w/w）改性的3D纳米网状结构Ag@Ti O2薄膜电极。利用电感耦合等离子体技术（ICP）、X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）和X射线能谱（EDX）等表征手段测试所合成材料的形貌及成分,实验结果表明Ag纳米颗粒可以成功沉积在Ti O2纳米线表面。电化学测试数据则表明,4.0%（w/w）负载量的Ag@Ti O2相比于未改性和其他负载量的Ti O2纳米线具有更好的倍率性能和更稳定的可逆容量。在50,100,200,400,800和1 200 m A·g的电流密度条件下,该改性电极的放电容量可分别达到261.4,253.7,239.5,216.5,193.1和185.1 m Ah·g,在200 m A·g下循环80次后容量保持率仍能达到99.8%。国家自然科学基金(No.51604132)资助项目

Distribution of dimethylsulfide of Xiamen sea surface water in spring

采用固相微萃取(SPME) 气相色谱法(GC)测定了厦门海域20个站位表层海水中DMS二甲基硫的含量,并对其分布进行分析。结果表明,厦门海域DMS含量在0 65～40 69nmol·L-1,平均浓度为12 83nmol·L-1。其中,西海域的含量最高,东海域次之,同安湾最低。与其它海域海水中DMS浓度比较,厦门海域DMS含量较高,浓度变化范围大,与叶绿素a浓度及表层水温、盐度之间无明显的相关关系。Dimethylsulfide (DMS) in surface seawater samples collected at 20 stations in the Xiamen sea area were analyzed with SPME-GC method. The results showed that the DMS concentrations varied from 0.65 to 40.69 nmol·L~(-1) with an average of 12.83 nmol·L~(-1). The concentration was the highest in Xiamen Western sea area, while was lower in Eastern sea area and the lowest in Tong'an Bay. Comparation with other sea areas, DMS concentration in Xiamen sea was higher, with the large variation. There were no clear relationships DMS with chlorophyll a, temperature and salty in Xiamen sea.国家自然科学基金(20077022);; 教育部重点课题(教技司2000第156号

Material and Energy Conversion of Integrated 100,t/a-Scale Bio-Jet Fuel-Range Hydrocarbon Production System via Aqueous Conversion of Biomass

以农业废弃物生物质为原料，利用水相转化技术，进行了百吨/年规模生物航油类烃(C8~C15)合成试运行.过程中采用两步酸解法分别将玉米秸秆中半纤维素和纤维素转化为糠醛和乙酰丙酸，作为生物质基平台化合物.在碱性条件下糠醛与乙酰丙酸经Aldol缩合反应实现碳链增长，生成的长链含氧中间体经过低温预加氢、高温加氢脱氧及精制，生成C8~C15范围内液态烃，可作为生物航油组分.以试运行实验结果为基础，进行了过程的物质与能量转化分析.结果表明，该路线获得液态烃类的基本性质满足合成航油ASTM-7566标准要求，并充分利用了原料中纤维素和半纤维素组分，是一条基于生物质的长链液态烃合成路线，1t航油约需10~12t干基玉米秸秆

日本留学で得たもの : 信州大学受入・派遣交換留学生の記録

Article信大日本語教育研究 4: 156-173 (2004)departmental bulletin pape

The effect of nurse initiated patient/family education strategy on people with schizophrenia in Beijing

2004-2005 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

芳樟树叶乙醇提取物的抗癌作用

探讨了芳樟树叶乙醇提取物各部分的抗癌作用。采用系统溶剂法从芳樟树叶得到一系列提取物,运用MTT和集落形成实验法考察各提取物对体外培养的人肺癌95-D细胞、人口腔表皮样癌KB细胞和肝癌HepG2细胞增殖的影响。结果发现石油醚部分A1、氯仿部分A2和乙酸乙酯部分A3对3种肿瘤细胞的增殖和集落形成均有不同程度的抑制作用,且给药量与细胞抑制和集落形成明显的正相关关系。因此,芳樟树叶乙醇提取物在体外有明显的抗肿瘤作用,且抗癌有效组分很可能在它的石油醚部分、氯仿部分以及乙酸乙酯部分

提高CO_2加氢合成甲醇选择性和收率的一种方法

提高CO2加氢合成甲醇选择性和收率的一种方法李基涛张伟德付金印古萍英（厦门大学化学系物理化学研究所361005）区泽棠（香港浸会大学化学系九龙塘）关键词CO2加氢合成甲醇CO的作用提高选择性和收率随着工业发展和人类利用石化能源的增加，大气中CO2浓度...香港浸会大学科研基金;厦门大学固体表面物理化学国家重点实验

Preliminary delineation and classification of estuarine drainage areas for major coastal rivers in China

采用gIS技术开展中国主要入海河流的流域边界及其汇水单元、河口集水区的划分及其分类。基于ArCgIS水文分析模块划分出15条入海河流的汇水单元,并通过5种不同汇水单元面积等级的划分来表达各入海河流汇水单元的详细程度;划分的流域面积与相关文献资料对比偏差在10%以内;在流域与汇水单元划分的基础上,基于感潮河段的数据收集,确定出88个中国主要入海河流的河口集水区。通过建立分类指标体系,采用聚类分析方法,划分出5类河口:第一类EdA主要分布在环渤海地区、山东半岛和广东沿海;第二类EdA主要分布在长江口和杭州湾周围;第三类EdA主要分布在江苏北部沿海和辽东半岛;第四类包括山东江苏交界处沿海、江苏南部沿海;第五类主要分布在福建浙江沿海、珠江口、长江口、海河口附近、辽河河口附近,并利用快速生物评价法验证河口分类的合理性。研究成果可为进一步开展我国近海河口和海域营养盐基准制订与生态分区提供基础空间数据与方法借鉴。Classification of estuarine and coastal waters has been recognized as a critical step for natural resource managers to describe and inventory coastal systems,understand constraints,predict the most sensitive systems,manage and protect coastal resources.However,the research on ecological classification in China is still in infancy,especially the classification of estuarine and coastal waters at regional or nationwide scale.This research employed Geographical Information System(GIS) and multivariate statistical analyses to delineate and classify the watersheds and estuarine drainage areas from fifteen major coastal rivers in China.The Hydrology module in ArcGIS environment was used to delineate the sub-watersheds from the fifteen coastal rivers,represented by spatially different details with five thresholds.The watershed boundaries of fifteen coastal rivers were further delimited and validated with literature documents.The deviation was less than 10%.Based on the analysis of spatial distribution of tide heads for fifteen rivers and the previously delineated sub-watersheds,88 estuarine drainage areas(EDAs) were further defined.A five-class classification system was developed with the hierarchical cluster analysis,based on the physical,biological and chemical properties of EDA.Estuaries having the smallest total EDA were grouped as class one,and they are located in Bohai Bay,Shandong peninsula and coastal areas of Guangdong;estuaries having the lowest average salinity range and the highest concentration of total suspended solid were grouped as class two,and they are located in Yangtze River estuary and Hangzhou bay;estuaries having the highest average depth and the highest wind speed were grouped as class three,and they are located in coastal areas of Northern Jiangsu and Liaodong peninsula;estuaries having the lowest dissolved oxygen and highest tidal range were grouped as class four,and they are located in coastal areas between Shandong and Jiangsu,coastal areas of Southern Jiangsu;estuaries having the largest average EDA and highest freshwater flow were grouped as class five,and they are located in coastal areas of Fujian and Zhejiang,Pearl river estuary,Haihe River estuary,and Liaohe River estuary.A rapid bio-assessment procedure was successfully employed to validate the classified result based on the collected data from literatures.The findings in this study provided the basic geospatial data for further developing nutrient criteria and eco-regionalization in estuarine and coastal waters in China.国家海洋局海洋公益性行业科研专项(200805090);国家海洋局近岸海域生态环境重点实验室基金(201005