Personal Sampler for Viable Airborne Microorganisms: Main Development Stages     

Igor E. Agranovski 《洁净——土壤、空气、水》2007,35(1):111-117

A new personal bioaerosol sampler has been developed and verified as an efficient tool for monitoring of viable/non‐viable airborne microorganisms, including bacteria, fungi, and viruses. The operational principle of the device is based on continuous passage of an air sample through porous media submerged into a liquid layer. During motion along narrow and tortuous ways inside the porous media, the air stream is split into a large number of ultra small bubbles with the particulates are being scavenged by these bubbles and, thus, effectively trapped. The device was initially verified for monitoring of viable airborne bacteria and fungi, firstly, under controlled laboratory conditions and later in a field. It was demonstrated that bacterial recovery rates for these two groups of microorganisms were very high and the device was found to be fully feasible for such monitoring. The next step of the device investigation was performed in the laboratory on monitoring viable airborne viruses with a range of sensitivities to physical and biological stresses. As the result, the new personal sampler demonstrated a very high recovery rate even for viruses which are rather sensitive to environmental stress (Avian Influenza, SARS, Mumps, etc.). Some following field studies, undertook in a hospital and animal houses, also demonstrated an excellent performance of the new device for selective and reliable monitoring of viable airborne viruses even in environments highly contaminated by other microorganisms. This paper reviews the main development staged of the new personal bioaerosol sampler.  相似文献   

长江三角洲南翼晚更新世——全新世沉积物地球物理研究     

孙秀容  戴纯俊  刘志高  许冬儿  潘兆忠 《物探与化探》2002,26(3):175-178

利用蕴涵着丰富的地球物理信息的波速测试成果 ,对长江三角洲南翼晚更新世—全新世沉积物作沉积过程及其沉积环境讨论  相似文献   

吉林通化南岔式金矿地质—地球物理—地球化学综合找矿模型   总被引：9，自引：0，他引：9  

关键 《中国地质》2001,28(12):22-29,42

老岭成矿带为吉林省最重要的贵金属、有色金属成矿带，南岔金矿是该成矿带近几年新发现的金矿床。在阐述南岔金矿成矿地质条件、岩（矿）石物性参数特征、地球物理场、地球化学特征的基础上，归纳并提取了控矿地质因素和物化控找矿标志，从而建立了“南岔式”金矿的地质－地球物理－地球化学找矿模型。  相似文献   

Propagation of tube waves generated by an external source in layered permeable rocks     

A. M. Ionov  G. A. Maximov 《Geophysical Journal International》1996,124(3):888-906

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物理探查方法在土壤改良中的应用研究   总被引：4，自引：0，他引：4  

郭秀军  章光新  谭笑平 《地理科学》1999,19(5):470-474

如何快速全面的了解整个改良区的土层分布情况及盐碱化程度,如何对改良的效果进行了有效的检测,是盐碱地改良工作中的所要解决的问题,应用物理探查的方法解决这些问题,证实其在盐碱地的改良工程中是一种可行,有效的方法,并拟在国家“九五”重点科技攻关项目专题－松嫩平原盐碱地综合治理与农业持续发展研究中采用此项技术方法,进行跨学科的技术应用研究。  相似文献   

EH-4电导率成像系统的特点及其在金属矿勘探中的应用   总被引：10，自引：0，他引：10  

孟贵祥  兰险 《矿床地质》2006,25(1):36-42

EH-4电导率成像系统是一种混场源频率域电磁观测系统,具有轻便、高效、勘探深度大、分辨率高的特点。通过在块状硫化物铜矿、斑岩铜矿已知矿区的试验研究,证实EH-4系统在这两种矿床类型的隐伏-半隐伏金属矿勘探中有较好的找矿效果。  相似文献   

云南兰坪—思茅盆地中轴构造带的特征及其研究意义   总被引：9，自引：1，他引：9       下载免费PDF全文

管 烨王安建  李朋武曹殿华 刘俊来 《中国地质》2006,33(4):832-841

笔者利用云南西部已有的DSS地震测深、石油反射地震资料的再解释,并通过地球物理、地球化学以及矿产等资料的综合分析,对滇西兰坪—思茅盆地内的中轴构造带的构造特征进行了深入分析。研究结果表明兰坪—思茅盆地内的中轴构造带是一条近南北走向的集断裂带、伸展构造、深部隆起为一身的大型构造带。地震测深的速度结构及反射地震剖面表明,中轴构造带在思茅盆地南部存在有深部地幔的上隆现象,该构造带内的断裂系统倾向在盆地南北有差异。研究发现该构造带与矿床、侵入碱性岩体及区域地化异常分布有密切的关系。结合地质构造分析研究,表明该构造带是一多期活动的重要构造带,具有伸展走滑的性质;中轴构造带在形成、演化过程中被近东西向的多条直线型断裂所错断,从构造形态上看与大洋中脊有相似的展布特征。该构造带对盆地的构造演化以及矿产形成具有重要控制作用。  相似文献   

Lidar遥感基本原理及其发展     

隋立春  张宝印 《测绘学院学报》2006,(2)

介绍了航空激光扫描(Airborne laser scanning)或者Lidar遥感信息获取系统的基本原理、系统的组成、数据获取的方法及其步骤;对近数十年来应用激光扫描遥感信息获取地形表面模型方面取得的主要成果、应用现状做了简要回顾和评述;结合GIS和影像融合方法对Lidar遥感技术未来发展趋势进行了展望。  相似文献   

Turbulent fluxes from Helipod flights above quasi-homogeneous patches within the LITFASS area     

Jens Bange  Thomas Spieß  Marcus Herold  Frank Beyrich  Barbara Hennemuth 《Boundary-Layer Meteorology》2006,121(1):127-151

Turbulent fluxes of sensible and latent heat were measured with the helicopter-borne turbulence probe Helipod over a heterogeneous landscape around the Meteorological Observatory Lindenberg during the STINHO-2 and LITFASS-2003 field experiments. Besides the determination of area-averaged heat fluxes, the analysis focused on different aspects of the response of the turbulent structure of the convective boundary layer (CBL) on the surface heterogeneity. A special flight pattern was designed to study flux profiles both over quasi-homogeneous sub-areas of the study region (representing the major land use types—forest, farmland, water) and over a typical mixture of the different surfaces. Significant differences were found between the heat fluxes over the individual surfaces along flight legs at about 80 m above ground level, in agreement with large-aperture scintillometer measurements. This flux separation was still present during some flights at levels near the middle of the CBL. Different scales for the blending height and horizontal heterogeneity were calculated, but none of them could be identified as a reliable indicator of the mixing state of the lower CBL. With the exception of the flights over water, the latent heat flux measurements generally showed a larger statistical error when compared with the sensible heat flux. Correlation coefficients a nd integral length scales were used to characterise the interplay between the vertical transport of sensible and latent heat, which was found to vary between ‘fairly correlated’ and ‘decoupled’, also depending on the soil moisture conditions.  相似文献   

甘肃金川铜镍矿床地质—地球物理综合找矿模型   总被引：1，自引：0，他引：1       下载免费PDF全文

付开泉  李百祥 《甘肃地质》2006,15(1):62-67

据金川铜镍硫化矿床大量物化探资料,对金川铜镍矿4个矿区,按剥蚀程度不同分为3种类型:Ⅰ矿区矿体和岩体均出露;Ⅱ矿区岩体出露矿体隐伏;Ⅲ、Ⅳ矿区岩体和矿体均为隐伏;分别根据岩体、矿床赋存的地球物理—地球化学场特征,建立了矿床地质—地球物理综合找矿模型,并阐述了矿床的区域地球物理场标志。  相似文献