Orbits of Ten Visual Binary Stars

We present the orbits of ten visual binary stars: WDS 01015 6922, WDS 01424– 0645, WDS 01461 6349, WDS 04374–0951, WDS 04478 5318, WDS 05255–0033, WDS 05491 6248, WDS 06404 4058, WDS 07479–1212, and WDS 18384 0850. We have also determined their masses, dynamical parallaxes and ephemerides.     

自主控制的GIS技术与制图学远程教育:GITTA工程

“瑞士虚拟校园(SVC)”是瑞士联邦1999年发起,2000年启动的项目,主要是应用新的信息与网络技术,使G-IS技术得到广泛传播。现在人们对相关教育素材的需求不断上升。GITTA项     

佛罗里达和大巴哈马滩上新世—更新世低水位大气成岩作用的限制条件:海平面变动模型的意义

业已证实，潜水大气透镜体内更新世浅水碳酸盐岩中广泛发育成岩作用．且有人推测在更新世大规模低水位期间连续发生这种交代作用，其根据来自出现广布的埋藏洞穴（大于5000m；Spencer，1967），但是，所有的这些洞穴发现在浅水岩相中，在沉积作用之后不久开始重复地出露，因此，洞穴形成的原始深度仍然存在问题．为了正确确定大规模低水位期间出现的大气水成岩作用，蓄意在沉积作用时期存在一个未重复的与大气流体接触的层段，并且目前存在于海面之下80－120m，这样的一个较深水岩相上覆有浅水岩相，在佛罗里达南部和大巴哈马滩前积边缘（C…     

地核探索——一项并不过分的建议

对我们这颗行星的内部运作情况进行探索——这不是科幻小说，而是一项在技术上行得通的方案。     

Grain-size end-members and environmentally sensitive grain-size components: A comparative study in the mud shelf depocenters off southern Brazil

The current study aims to do a comparative analysis of the results obtained with two End-Member(EM)grain-size modeling techniques(AnalySize and BasEMMA)and the Environmental Sensitive Grain-Size(ESGS)modeling for sediment samples collected in the mudbelts of the southern Brazilian shelf.The methods were compared using grain-size data from the south Brazilian shelf,and the results are discussed here.It is the first time that the concept of ESGS,in its present form,is utilized outside China.The results show that despite its relative ease of use,the ESGS is not fully comparable to the EM analyses,and only two grain-size ESGS classes were recognized as analogous to EMs.The comparison of the AnalySize and BasEMMA procedures also revealed significant differences between the techniques.A comparative analysis between the two EM techniques revealed advantages in the BasEMMA,especially in the better correlation of the end-members with the original grain size distribution.The analysis of the geographical distribution of the EM abundances allowed point sources of sandy populations to be recognized as well as the contribution of the Rio de la Plata as a source of silty sediments to be inferred.     

平坦低地农业区人类活动影响下地形对森林分布的影响（英文）

Complex topography buffers forests against deforestation in mountainous regions.However,it is unknown if terrain also shapes forest distribution in lowlands where human impacts are likely to be less constrained by terrain.In such regions,if important at all,topographic effects will depend on cultural-historical factors and thus be human-driven(anthropogenic) rather than natural,except in regions where the general climate or extreme soils limit the occurrence of forests.We used spatial regression modeling to assess the extent to which topographic factors explain forest distribution(presence-absence at a 48×48 m resolution) in a lowland agricultural region(Denmark,43,075 km2) at regional and landscape scales(whole study area and 10×10 km grid cells,respectively),how landscape-scale forest-topography relationships vary geographically,and which potential drivers(topographic heterogeneity,forest cover,clay content,coastal/inland location) determine this geographic heterogeneity.Given a moist temperate climate and non-extreme soils all landscapes in Denmark would naturally be largely forest covered,and any topographic relationships will be totally or primarily human-driven.At regional scale,topographic predictors explained only 5% of the distribution of forest.In contrast,the explanatory power of topography varied from 0%–61% at landscape scale,with clear geographic patterning.Explanatory power of topography at landscape scale was moderately dependent on the potential drivers,with topographic control being strongest in areas with high topographic heterogeneity and little forest cover.However,these conditioning effects were themselves geographically variable.Our findings show that topography by shaping human land-use can affect forest distribution even in flat,lowland regions,but especially via localized,geographically variable effects.     

Engineering Geological Map of the Sakha （Yakutia） Republic

The Engineering Geological Map of the Sakha（Yakutia） Republic covers about 3 million kilometers which is one-fifth of the territory of Russia.The map displays ground and geocryological conditions and active faults.Seismic intensity,schemes of zoning by factors of engineering geological conditions,and the general scheme of engineering geological zoning of the Sakha（Yakutia） Republic or the SR（Y）,are shown on the inset maps.The map is required to provide information for planning,construction and exploitation of engineering structures in the SR（Y）.A distinguishing feature of the map is the indication of almost blanket distribution of the frozen ground class.Types of the frozen ground class are separated by lithology,while ground varieties are separated by temperature.Fresh and ultra-fresh suprapermafrost water is predominant within the territory.The compiled map indicates parts of the Arctic-Asian and Baikalo-Stanovoi planetary seismic belts that make engineering geological conditions more complicated.     

Study of moisture migration in clay soils considering rate of freezing

The paper presents some methods of numerical modeling and a study of moisture changing in frozen clay soils considering rates of freezing in the base of construction.An impact assessment of moisture changes in clay soils affecting strength characteristics during thawing was carried out in stability tests.     

Use of a telemetered dispensing system for controlling nutrient additions to experimental patch reefs in the ENCORE study at One Tree Island, Great Barrier Reef, Australia

A telemetrically controlled system was developed to add nutrients automatically to experimental patch reefs in a remote marine environment. The experiment, called ENCORE, was done in the lagoon of One Tree Island, a remote research station at the southern end of the Great Barrier Reef. Nutrient dispensing units (NDUs), moored adjacent to patch reefs in the lagoon, were telemetrically linked to a base station on the island. The base station, about 3 km away from the furthest NDU, consisted of a dedicated computer, controller and radio transmitter, which relayed coded signals to a radio receiver mounted on each NDU. This activated a solenoid valve to discharge a measured quantity of concentrated nutrient solution from a measuring chamber using compressed air from a SCUBA tank. The solution was discharged through 4-8 PVC outlets into the basins of the patch reefs to allow thorough mixing. The base station interrogated each NDU to find out if the operation had been successful and stored the information on disk to provide a daily log of operations. Nutrient samples taken within the patch reefs demonstrated that calculated initial mean concentrations of 2 micrograms-at PO4-P l-1 and 10 micrograms-at NH4-N l-1 were achieved. The system we have developed can be used in many situations where regular perturbations need to be introduced to aquatic ecosystems. It uses state-of-the-art technology, yet all components are commercially readily available and relatively inexpensive. Detailed specifications and drawings are available from the Great Barrier Reef Marine Park Authority.