54 research outputs found
On the density of the set of primes which are related to decimal expansion of rational numbers (Analytic Number Theory and Surrounding Areas)
Spacial and temporal variations of water characteristics in the Japan Sea bottom layer
The Japan Sea is an almost landlocked marginal sea. We measured profiles of CTD potential temperature at 9 stations in the southeastern Japan Sea to clarify the characteristics of the abyssal circulation in the Sea. It was shown that the results were closely correlated with the topography of the Japan Sea which is characterized by a rise in the center of the Sea (Yamato Rise) and three basins (Japan, Yamato and Tsushima Basins) around the Yamato Rise.At each station in the Basins (6 stations), we observed the bottom layer, a layer of constant potential temperature (within ±0.0005°C) below 2,000–2,500 m depth to the bottom. Dissolved oxygen is also constant (within ±1 μmol kg−1) in the bottom layer. The bottom layer of the Japan Basin (northern basin) is shown to have lower potential temperature by 0.012°C and higher dissolved oxygen content by 5 μmol kg−1 than that of the Yamato Basin (southern basin). There is no bottom layer at the remaining 3 stations located in the passage between the Japan Basin and the Yamato Basin, possibly due to the topographic effect of the Yamato Rise which restricts the exchange and mixing of the two Basin bottom waters.By comparing the vertical profiles of dissolved oxygen in 1969, 1977, 1979 and 1984 in the Japan and the Yamato Basins, it was found that in both Basins the thickness of the bottom layer decreased by 400 m between 1969 and 1984, and the bottom oxygen concentration was also decreased by 5–7 μmol kg−1 between 1977 and 1984. These temporal variations were interpreted to be transient, probably caused by the recent reduction or cessation of new bottom water formation in the northern Japan Sea
Sediment trap experiments in the deep North Atlantic: Isotopic and elemental fluxes
We have carried out sediment trap experiments at sites in the Sargasso Sea (S2) and in the Atlantic off Barbados (E) to determine the mass flux and chemical composition of material sinking to the sea floor…
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Research and Design of a Routing Protocol in Large-Scale Wireless Sensor Networks
无线传感器网络,作为全球未来十大技术之一,集成了传感器技术、嵌入式计算技术、分布式信息处理和自组织网技术,可实时感知、采集、处理、传输网络分布区域内的各种信息数据,在军事国防、生物医疗、环境监测、抢险救灾、防恐反恐、危险区域远程控制等领域具有十分广阔的应用前景。 本文研究分析了无线传感器网络的已有路由协议,并针对大规模的无线传感器网络设计了一种树状路由协议,它根据节点地址信息来形成路由,从而简化了复杂繁冗的路由表查找和维护,节省了不必要的开销,提高了路由效率,实现了快速有效的数据传输。 为支持此路由协议本文提出了一种自适应动态地址分配算——ADAR(AdaptiveDynamicAddre...As one of the ten high technologies in the future, wireless sensor network, which is the integration of micro-sensors, embedded computing, modern network and Ad Hoc technologies, can apperceive, collect, process and transmit various information data within the region. It can be used in military defense, biomedical, environmental monitoring, disaster relief, counter-terrorism, remote control of haz...学位:工学硕士院系专业:信息科学与技术学院通信工程系_通信与信息系统学号:2332007115216
Application of Ion Exchange Technique to Decontamination of Polluted Water Generated by Fukushima Nuclear Disaster
Variations in seawater osmium isotope composition since the last glacial maximum: A case study from the Japan Sea
Experimental alteration of molybdenite: Evaluation of the Re-Os system, infrared spectroscopic profile and polytype
Speciation of Chromium in Seawater by ICP-AES with Dual Mini-columns Containing Chelating Resin
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