Calcium isotope fractionation in modern scleractinian corals

The ⁴⁴Ca/⁴⁰Ca ratios of cultured (Acropora sp.) and open ocean (Pavona clavus, Porites sp.) tropical reef corals are positively correlated with growth temperature. The slope of the temperature-fractionation relation is similar to inorganic aragonite precipitates. However, δ^44/40Ca of the coral aragonite is offset from inorganic and sclerosponge aragonite by about +0.5‰. This offset can neither be explained by the very fast, biologically controlled calcification of scleractinian corals, nor as a consequence of calcification from a partly closed volume of fluid. As corals actively transport calcium through several cell layers to the site of calcification, the most likely explanation for the offset is a biologically induced fractionation. Our results indicate a limited use of Ca isotopes in scleractinian corals as temperature proxy.     

密闭微波消解-等离子体发射光谱法测定钢铁样品中的硅

为了准确测定高等级钢铁中的Si,必须使用ＨＦ。用ICP-AES法测定Si会受到Co、Mo、Ni、Ta、V和W的严重干扰,仅仅使用外标或内标（标准加入）无法保证足够的准确性,必须使用基质匹配空白校正技术才能得到准确的Si的测定结果。利用Multiwave 3000 密闭式微波加压湿法消解技术结合ＩＣＰ－AＥＳ测定高等级钢铁中Si的方法,与常规重量法相比,可以极大地节省时间和减小试剂的消耗。     

Moderately compact helix antennas with cutoff patterns for millimeter RTK positioning

GPS Solutions - Helical antennas have been developed that feature a cutoff pattern and are suitable for practical positioning at millimeter level. The antennas are in the form of a tube with...     

Flare-associated coronal expansion phenomena

Two classes of coronal expansion phenomena have been studied in Sacramento Peak coronal movies: Slow, slightly decelerated expansion phenomena (v=∼10− =∼ 2 km/sec) and fast, accelerated, quasi-exploding arches (v =∼ 10 - > 100 km/sec). The various phenomena were found to be associated with flares in different ways: The slow expansions were long lived post-flare phenomena initiated by the flare; the accelerated expanding arches were either (a) arches expanding prior to and apparently exploding at flare onset, or (b) arches apparently emerging from the flare (probably in its initial phase) and rapidly expanding and exploding, or (c) the expansion and disruption of (originally stable) coronal arches during occurrence of a distant flare. These expansions may be considered as evidence for corresponding flare associated changes in the coronal magnetic field. Mitteilung aus dem Fraunhofer Institut Nr. 96.     

International tourism and its impact on the Slovenian society and landscape

By all the usual measurements, Slovenia should present a particularly attractive destination for tourists. First, it has a diversity of natural phenomena; second, the cultural landscape has imprints of many peoples and times. But oddly enough only several resorts, based on attractions of nature, like Rogaka Slatina (mineral wells), Portoro-Portorose (Mediterranean littoral) and Bled (alpine lake) are comparable to similar places in Europe. On above named examples the effects of the tourist industry are elaborated. This paper suggests that the phenomenon tourism impacts the culture, economy and looks of a diversity of Slovenian regions. Due to a basic ignorance during most of the socialist era, in Slovenia as a whole tourism gives bread only to 3% of the resident population. Opportunities for the development of this branch of economy are diverse.     

An Interferometric Method For Measurement Of The Detector Mtf

We present an interferometric method by which the MTF of an array detector is measured directly. The method is not relying on high quality optics and precise alignment/focusing and it is therefore straightforward to set up.     

Life Histories and Breeding Patterns of Three Intertidal Sand Beach Isopods

Abstract. Three-weekly transects were done over a 14-month period at Sundays River Beach, a high energy beach in Algoa Bay, South Africa, to determine the life histories, breeding patterns, and fecundities of three intertidal cirolanid isopods. Eurydice longicornis. Pontogeloides latipes , and Excirolana naialensis. E. longicornis exhibits an annual, multivoltine life history with a more extended breeding period than the other two species. P. latipes and E. natalensis both have biennial. univoltine life histories with lower fecundities than E. longicornis.     

Effects of crude oil on the supralittoral meiofauna of a sandy beach

The supralittoral zone of an open sandy beach was dosed with crude oil and changes in the meiofauna monitored. Treatments included weathered and fresh oil on the surface, fresh oil mixed with dispersant on the surface and weathered oil at the water table, all in layers 0·8 cm thick. In all cases the meiofauna was reduced 1 month after dosing but numbers had returned to normal by 5 months except in the site dosed with fresh oil mixed with dispersant. Oil on the surface had greater effects than oil at the water table; fresh oil had a greater effect than weathered oil and fresh oil with dispersant was more toxic than fresh oil alone. Nematodes were least sensitive to the oil and oligochaetes more sensitive, their numbers being correlated with oil concentrations and depth in the substrate. It is concluded that, under all but the heaviest conditions of pollution in their environment, recovery from oil contamination should occur within 5 months in the meiofauna.