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  • 1
    Monograph available for loan
    Monograph available for loan
    Recent approaches in polar earth science : the 10th Seoul International Symposium on Polar Sciences ; October 21-23, 2003 ; Songdo Beach Hotel, Incheon, Korea (2003)
    Seoul : Korea Polar Research Institute
    Details Availability
    Call number: AWI P7-18-91976
    Type of Medium: Monograph available for loan
    Pages: 140 Seiten , Illustrationen
    Language: English
    Note: Contents: Polar sciences and global environmental changes / Byong-Kwon Park. - The sun earth connection: thermodynamics of the terrestrial atmosphere during geo-effective events / R. J. Niciejewski and Y.-I. Won. - Observations of atmospheric waves in the high-latitude / Y.-I. Won, R. J. Niciejewski, P. Espy, J.-K. Chung and Bang Yong Lee. - Malaysian Antarctic Research Program / Nasaruddin Rahman, Salleh Mohd Nor and Azizan Abu Samah. - Compositional variation in pyrochlore from the Sokoli Phoscorite-Carbonatite complex, Kola Peninsula, Arctic / Mi Jung Lee, C. Terry Williams, Jong Ik Lee, and Yeadong Kim. - U-Th-Pb electron microprobe datings on the Rayner complex, East Antarctica / Yoichi Motoyoshi, Tomokazu Hokada and Kazuyuki Shiraishi. - Geochemical variation during hydrothermal alteration of basaltic andesite at Barton Peninsula, King George Island, Antarctica / Soon Do Hur, Jong Ik Lee and Jeong Hwang. - The paleocene-eocene volcanic succession in the Barton Peninsula, King George Island, Antarctica: Lithofacies, eruption styles and depositional processes / Seung Bum Kim, Young Kwan Shon and Moon Young Choe. - Holocene paleoclimate in Antarctic Lake Langer (King George Island) / B. K. Khim, K. Lee, H. I. Yoon and C. Y. Kang. - Holocene paleoceanography and paleoclimate of the West Spitsbergen Area, Euro-Arctic margin / Morten Hald, Hanne Ebbesen, Matthias Forwick, Sergei Korsun, Tore O. Vorren, Liza Khomenko, and Fred Godtliebsen. - Origins and paleoceanographic significance of layered diatom ooze interval from the Bransfield Strait in the Northern Antarctic Peninsula around 2500 yrs BP / Ho Il Yoon, Byong-Kwon Park, Yeadong Kim, Cheon Yun kang and Sung-Ho Kang. - A record of holocene environmental changes in terrestrial sedimentary deposits on King George Island, Antarctica / A. Tatur, R. del Valle, A. Barczuk, J. Martinez-Macchiavello. - Geochemistry of soils of King George Island, South Shetland Islands, West Antarctica: Implications for pedogenesis in cold polar regions / Yong Il Lee, Hyoun Soo Lim, and Ho Il Yoon. - Seafloor structure around the epicenter of the Great Antarctic Plate earthquake / Yoshifumi Nogi and Kin-ichiro Koizumi. - Multidisciplinary surveys by 'structure and evolution of the East Antarctic Lithosphere': SEAL-2000, -2002 / M. Kanao, H. Miyamachi, S. Toda, H. Murakami, T. Tsutsui, T. Matsushima, M. Takada, A. Watanabe, M. Yamashita, K. Yoshii, K. Kaminuma, and SEAL Geotransect Group. - Local seismic activity around Syowa Station, East Antarctica / Katsutada Kaminuma and Masaki Kanao. - Morphological characteristics of the intersection between Phoenix Ridge and the Hero Fracture Zone / Kyu Jung Kim, Young Keun Jin, Sang Heon Nam, Joo Han Lee and Yeadong Kim. - Visual observation experiments to investigate the formation processes of globular gas hydrate / H. Shoji. - Gas hydrate BSR-derived heat flow variation on the South Shetland Continental Margin, Antarctic Peninsula / Young Keun Jin, Sang Heon Nam, Yeadong Kim, Kyu Jung Kim and Joo Han Lee. - Introduction to ice core drilling program on Amery Ice Shelf in the 2002/2003 Antarctic summer season / Yuansheng Li, Dejun Tan, Zengdi Pan, Zhaoqian Dong, Bo Sun and Jiahong Wen. - 724 M deep ice core from Akademii Nauk Ice Cap Severnaya Zemlya (Russian Arctic) - Electrical conductivity measurements and isotopic record / D. Fritzsche, R. Schütt, H. Meyer, H. Miller, and F. Wilhelms. - Introduction of the Chinese Polar Cryospheric Database System (CPCDS) / Xiang Qin, Dahe Qin and Yongjian Ding. - Natural variations in lead, cadmium, copper and zinc concentrations and their sources in Vostok Antarctic Ice from 65,000 to 240,000 years BP / Sungmin Hong, Kang Hyun Lee, Claude F. Boutron, Christophe P. Ferrari, Jean Robert Petit, Carlo Barbante, Kevin Rosman, Vladimir Y. Lipenkov. - Fluctuation of ice sheet elevation in East Antarctica since the late Pliocene / Xiaohan Liu, Ping Kong, Feixin Huang, Xiaoli Li, and Aimin Fang. - Variations of total ozone amount and erythermal ultraviolet radiation at King Sejong Station in West Antarctica / Bang Yong Lee, Hi-Ku Cho, Yun-Gon Lee and Young-In Won. - Variability of regional atmospheric circulation related with recent warming in the Antarctic Peninsula / Jeong-Soon Lee, Tae-Yong Kwon, Bang-Yong Lee, Ho Il Yoon and Jeong-Woo Kim. - The surface UV-A and erythermal UV-B radiation changes at King Sejong Station of West Antarctica / Kyu-Tae Lee, Joon-Bum Jee, Won-Hak Lee, Youn-Joung Kim, Bang Yong Lee, and Young-In Won. - Climatological characteristics of the polar ionosphere based on the Sondrestrom and Chatanika incoherent scatter radar measurements / Young-Sil Kwak and Byung-Ho Ahn. - Cloudy band and air inclusions observed in deep ice core samples from GRIP, Greenland / Kimiko Shimohara, Hitoshi Shoji and Sepp Kipfstuhl. - Geochemical trends and Milankovitch cycles within sediment from the North Atlantic Ocean / Sangmin Hyun, Naokazu Ahagon and Ho Il Yoon. - Oceanographic mechanism of regional warming in the Antarctic Peninsula / Kyu-Cheul Yoo, Ho Il Yoon, Jae-Kyung Oh, Tae-Yong Kwon and Cheon Yun Kang. - East Asian Monsoon variation during the late pleistocene to holocene: paleoclimate changes indicated by proxy records from Jeju Island, Korea / Seung Hyoun Lee, Yong Il Lee, Ho Il Yoon and Cheon Yun Kang. - Occurrence of vivianite in late pleistocene lacustrine sediments at Sogwipo, Jeju Island, Korea / Seung Hyoun Lee, Yong Il Lee, Ho Il Yoon, Cheon Yun Kang and Yaedong Kim. - Microfabric analysis of laminated diatom ooze in the holocene sediments from the eastern Bransfield Strait, Antarctic Peninsula / Jang Jun Bahk, Ho Il Yoon, Yeadong Kim, Cheon Yun Kang and Sung Ho Bae. - Late Quaternary paleoenvironment of the Saint Anna Trough, Arcitc Russia / Jae Il Lee, Yeadong Kim and Ho Il Yoon. - Formation and dissociation processes of gas hydrates composed of methane and carbon dioxide below the ice point / A. Hachikubo, K. Yamada, T. Miura, K. Hyakutake, K. Abe and H. Shoji. - Visual observations of tubular gas hydrate formation in a pressure cell with water and seafloor sediment / K. Hyakutake, O. Kitamura, S. Kataoka, A. Hachikubo, H. Shoji and L. Mazurenko. - Formation processes of massive gas hydrate in a pressure cell with water-saturated sediment conditions / O. Kitamura, S. Kataoka, K. Hyakutake, A. Hachikubo and H. Shoji. - Phase equilibrium studies on mixed gas hydrates composed of methane and carbon dioxide below the ice point / T. Miura, A. Hachikubo, K. Hyakutake, K. Abe and H. Shoji. - CP-MAS 13C-NMR study on the crystallographic structure of natural gas hydrate in the bottom of the Okhotsk Sea and Lake Baikal / M. Kida, H. Sakagami, H. Minami, Y. Numokawa, N. Takahashi, T. Matveeva, H. Shoji, S. Takeya, Y. Kamata, T. Ebinuma, H. Narita, V. Soloviev, K. Wallmann, N. Biebow, A. Obzhirov, A. Salomatin, J. Poort, O. Khlystov and M. Grachev. - Some features of gas hydrates in the sea of Okhotsk / T. Matveeva, V. Soloviev, K. Wallmann, A. Obzhirov, N. Biebow, J. Poort, A. Salomatin and H. Shoji. - High-resolution echo facies analysis of glacial-marine deposits in the Bransfield Basin, Antarctica / S. H. Yoon, H. I. Yoon and J. Howe. - Characteristics of Beach sands, King George Island, West Antarctica / Tae Jin Choi, Yong Il Lee and Ho Il Yoon. - Transition from debris flow to hyperconcentrated flow in a submarine channel (the Cretaceous Cerro Toro Formation, Southern Chile) / Y. K. Sohn, M. Y. Choe, and H. R. Jo. - Chemical weathering of glacial debris and volcanic ash in King George Island, Antarctica / Gi Young Jeong and Bong Ho Lee. - The cenozoic sedimentary records found in the Grove Mountains, East Antarctica and their climatic implications / Aimin Fang, Xiaohan Liu, Xiaoli Li, Jong Ik Lee, Yitai Ju and Feixin Huang. - The pollen assemblages found in the cenozoic sedimentary rocks in Grove Mountains, East Antarctica / Aimin Fang, Xiaohan Liu, Xiaoli Li, Yitai Ju and Weimin W
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
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    Ice rafted debris proxies for sediment cores RS15-LC42, RS15-LC48, IODP Site 318-U1361 and ODP Site 118-1165 (2020)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: Quantification of ice-rafted debris (IRD) abundances in deep-sea records using three independent methodologies of obtaining IRD abundances and how different approaches will affect determinations of mass accumulation rates (MARs). The three methodologies for this cross comparison of methods include: counting clasts 〉2 mm in x-radiograph images; the sieved weight percentage of the medium-to-coarse sand fraction (250 μm-2 mm); and volumetric estimates of the 〉125 μm sand fraction using Laser diffraction Particle Size Analysis (LPSA) methods to determine particle size. The data are collected from the Wilkes Land and Ross Sea region of Antarctica, using cores RS15-LC42,RS15-LC48, IODP sites 1361 and ODP site 1165.
    Keywords: Antarctica; Grain Size; Ice Rafted Debris; method
    Type: Dataset
    Format: application/zip, 15 datasets
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  • 3
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    Neodymium isotopic ratios and clay mineral composition from ODP Hole 1147A and Site 184-1148 (2002)
    PANGAEA
    In:  Supplement to: Clift, Peter D; Lee, Jae Il; Clark, M K; Blusztajn, Jerzy S (2002): Erosional response of South China to arc rifting and monsoonal strengthening; a record from the South China Sea. Marine Geology, 184(3-4), 207-226, https://doi.org/10.1016/S0025-3227(01)00301-2
    Details
    Publication Date: 2024-03-02
    Description: Ocean Drilling Program sampling of the distal passive margin of South China at Sites 1147 and 1148 has yielded clay-rich hemipelagic sediments dating to 32 Ma (Oligocene), just prior to the onset of seafloor spreading in the South China Sea. The location of the drill sites offshore the Pearl River suggests that this river, or its predecessor, may have been the source of the sediment in the basin, which accounts for only not, vert, similar ~1.8% of the total Neogene sediment in the Asian marginal seas. A mean erosion depth of not, vert, similar ~1 km over the current Pearl River drainage basin is sufficient to account for the sediment volume on the margin. Two-dimensional backstripping of across-margin seismic profiles shows that sedimentation rates peaked during the middle Miocene (11-16 Ma) and the Pleistocene (since 1.8 Ma). Nd isotopic analysis of clays yielded epsilonNd values of -7.7 to -11.0, consistent with the South China Block being the major source of sediment. More positive epsilonNd values during and shortly after rifting compared to later sedimentation reflect preferential erosion at that time of more juvenile continental arc rocks exposed along the margin. As the drainage basin developed and erosion shifted from within the rift to the continental interior epsilonNd values became more negative. A rapid change in the clay mineralogy from smectite-dominated to illite dominated at not, vert, similar 15.5 Ma, synchronous with middle Miocene rapid sedimentation, mostly reflects a change to a wetter, more erosive climate. Evidence that the elevation of the Tibetan Plateau and erosion in the western Himalaya both peaked close to this time supports the suggestion that the Asian monsoon became much more intense at that time, much earlier than the 8.5 Ma age commonly accepted.
    Keywords: 184-1147A; 184-1148A; 184-1148B; AGE; Chlorite; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Illite; Joides Resolution; Kaolinite; Leg184; Mass spectrometer VG 354; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; Ocean Drilling Program; ODP; Opal-CT; Sample code/label; Smectite; South China Sea; X-ray diffraction TEXTUR, clay fraction; ε-Neodymium
    Type: Dataset
    Format: text/tab-separated-values, 362 data points
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  • 4
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    Concentrations of IPSO25 in surface sediments from coastal and near-coastal Antarctic locations (2016)
    PANGAEA
    In:  Supplement to: Belt, Simon T; Smik, Lukas; Brown, Thomas A; Kim, Jung-Hyun; Rowland, Steve J; Allen, Claire Susannah; Gal, Jong-Ku; Shin, Kyung-Hoon; Lee, Jae Il; Taylor, Kyle W R (2016): Source identification and distribution reveals the potential of the geochemical Antarctic sea ice proxy IPSO25. Nature Communications, 7, 12655, https://doi.org/10.1038/ncomms12655
    Details
    Publication Date: 2024-03-18
    Description: The presence of a di-unsaturated highly branched isoprenoid (HBI) lipid biomarker (diene II) in Southern Ocean sediments has previously been proposed as a proxy measure of palaeo Antarctic sea ice. Here we show that a source of diene II is the sympagic diatom Berkeleya adeliensis Medlin. Furthermore, the propensity for B. adeliensis to flourish in platelet ice is reflected by an offshore downward gradient in diene II concentration in 〉100 surface sediments from Antarctic coastal and near-coastal environments. Since platelet ice formation is strongly associated with super-cooled freshwater inflow, we further hypothesize that sedimentary diene II provides a potentially sensitive proxy indicator of landfast sea ice influenced by meltwater discharge from nearby glaciers and ice shelves, and re-examination of some previous diene II downcore records supports this hypothesis. The term IPSO25-Ice Proxy for the Southern Ocean with 25 carbon atoms-is proposed as a proxy name for diene II.
    Keywords: Antarctic Peninsula; ANT-II/3; ANT-III/3; ANT-IV/2; ANT-IV/3; ANT-IV/4; ANT-IX/3; ANT-VI/2; ANT-VI/3; ANT-VIII/5; ANT-VIII/6; Atka Bay; Bransfield Strait; Campaign of event; Camp Norway; Cape Fiske; Date/Time of event; DEPTH, sediment/rock; Drake Passage; Elevation of event; Event label; Filchner Shelf; Filchner Trough; Fram Strait; Gas chromatography - Mass spectrometry (GC-MS); Giant box corer; GKG; Gould Bay; Greenland Slope; Halley Bay; Ice Proxy for the Southern Ocean with 25 carbon atoms per unit sediment mass; Kapp Norvegia; King George Island, Antarctic Peninsula; Latitude of event; Lazarev Sea; Location of event; Longitude of event; Lyddan Island; Maud Rise; Optional event label; Polarstern; Polarstern Kuppe; PS04; PS04/225; PS06/289; PS06/303; PS06/313; PS06/329; PS06 SIBEX; PS08; PS08/294; PS08/324; PS08/327; PS08/333; PS08/338; PS08/340; PS08/344; PS08/345; PS08/346; PS08/347; PS08/350; PS08/353; PS08/354; PS08/355; PS08/356; PS08/364; PS08/366; PS08/368; PS08/374; PS08/375; PS08/379; PS08/380; PS08/381; PS08/382; PS08/386; PS08/396; PS08/402; PS08/445; PS08/601; PS1138-8; PS12; PS12/119; PS12/122; PS12/127; PS12/129; PS12/195; PS12/458; PS1273-1; PS1277-1; PS1282-1; PS1284-1; PS1345-8; PS1364-1; PS1366-2; PS1367-1; PS1370-1; PS1371-1; PS1372-2; PS1373-2; PS1374-2; PS1375-2; PS1376-2; PS1377-1; PS1378-1; PS1379-1; PS1380-1; PS1386-1; PS1388-1; PS1390-1; PS1394-1; PS1395-1; PS1396-1; PS1397-1; PS1398-2; PS1399-1; PS1402-2; PS1406-1; PS1412-1; PS1421-1; PS1453-1; PS1539-1; PS1540-1; PS1542-1; PS1544-1; PS1559-1; PS16; PS16/432; PS16/472; PS16/499; PS16/507; PS16/516; PS16/518; PS16/525; PS16/536; PS16/540; PS16/541; PS16/547; PS16/549; PS1635-2; PS1798-2; PS18; PS18/148; PS18/171; PS18/214; PS18/218; PS18/221; PS1802-2; PS1803-2; PS1805-5; PS1812-5; PS1813-5; PS1817-5; PS1822-1; PS1823-1; PS1824-2; PS1825-5; PS1826-2; PS2006-1; PS2024-3; PS2062-2; PS2065-1; PS2067-1; Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 57 data points
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  • 5
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    Sensitivity of the West Antarctic Ice Sheet to +2 °C (SWAIS 2C) (2022)
    In:  EPIC3Scientific Drilling, 30, pp. 101-112, ISSN: 1816-3459
    Details
    Publication Date: 2022-03-14
    Description: The West Antarctic Ice Sheet (WAIS) presently holds enough ice to raise global sea level by 4.3 m if completely melted. The unknown response of the WAIS to future warming remains a significant challenge for numerical models in quantifying predictions of future sea level rise. Sea level rise is one of the clearest planet-wide signals of human-induced climate change. The Sensitivity of the West Antarctic Ice Sheet to a Warming of 2 ∘C (SWAIS 2C) Project aims to understand past and current drivers and thresholds of WAIS dynamics to improve projections of the rate and size of ice sheet changes under a range of elevated greenhouse gas levels in the atmosphere as well as the associated average global temperature scenarios to and beyond the +2 ∘C target of the Paris Climate Agreement. Despite efforts through previous land and ship-based drilling on and along the Antarctic margin, unequivocal evidence of major WAIS retreat or collapse and its causes has remained elusive. To evaluate and plan for the interdisciplinary scientific opportunities and engineering challenges that an International Continental Drilling Program (ICDP) project along the Siple coast near the grounding zone of the WAIS could offer (Fig. 1), researchers, engineers, and logistics providers representing 10 countries held a virtual workshop in October 2020. This international partnership comprised of geologists, glaciologists, oceanographers, geophysicists, microbiologists, climate and ice sheet modelers, and engineers outlined specific research objectives and logistical challenges associated with the recovery of Neogene and Quaternary geological records from the West Antarctic interior adjacent to the Kamb Ice Stream and at Crary Ice Rise. New geophysical surveys at these locations have identified drilling targets in which new drilling technologies will allow for the recovery of up to 200 m of sediments beneath the ice sheet. Sub-ice-shelf records have so far proven difficult to obtain but are critical to better constrain marine ice sheet sensitivity to past and future increases in global mean surface temperature up to 2 ∘C above pre-industrial levels. Thus, the scientific and technological advances developed through this program will enable us to test whether WAIS collapsed during past intervals of warmth and determine its sensitivity to a +2 ∘C global warming threshold (UNFCCC, 2015).
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 6
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    Reviews and syntheses : Ocean iron fertilization experiments – past, present, and future looking to a future Korean Iron Fertilization Experiment in the Southern Ocean (KIFES) project (2018)
    Copernicus Publications on behalf of the European Geosciences Union
    Details
    Publication Date: 2022-05-25
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Biogeosciences 15 (2018): 5847-5889, doi:10.5194/bg-15-5847-2018.
    Description: Since the start of the industrial revolution, human activities have caused a rapid increase in atmospheric carbon dioxide (CO2) concentrations, which have, in turn, had an impact on climate leading to global warming and ocean acidification. Various approaches have been proposed to reduce atmospheric CO2. The Martin (or iron) hypothesis suggests that ocean iron fertilization (OIF) could be an effective method for stimulating oceanic carbon sequestration through the biological pump in iron-limited, high-nutrient, low-chlorophyll (HNLC) regions. To test the Martin hypothesis, 13 artificial OIF (aOIF) experiments have been performed since 1990 in HNLC regions. These aOIF field experiments have demonstrated that primary production (PP) can be significantly enhanced by the artificial addition of iron. However, except in the Southern Ocean (SO) European Iron Fertilization Experiment (EIFEX), no significant change in the effectiveness of aOIF (i.e., the amount of iron-induced carbon export flux below the winter mixed layer depth, MLD) has been detected. These results, including possible side effects, have been debated amongst those who support and oppose aOIF experimentation, and many questions concerning the effectiveness of scientific aOIF, environmental side effects, and international aOIF law frameworks remain. In the context of increasing global and political concerns associated with climate change, it is valuable to examine the validity and usefulness of the aOIF experiments. Furthermore, it is logical to carry out such experiments because they allow one to study how plankton-based ecosystems work by providing insight into mechanisms operating in real time and under in situ conditions. To maximize the effectiveness of aOIF experiments under international aOIF regulations in the future, we therefore suggest a design that incorporates several components. (1) Experiments conducted in the center of an eddy structure when grazing pressure is low and silicate levels are high (e.g., in the SO south of the polar front during early summer). (2) Shipboard observations extending over a minimum of  ∼ 40 days, with multiple iron injections (at least two or three iron infusions of  ∼ 2000kg with an interval of  ∼ 10–15 days to fertilize a patch of 300km2 and obtain a  ∼ 2nM concentration). (3) Tracing of the iron-fertilized patch using both physical (e.g., a drifting buoy) and biogeochemical (e.g., sulfur hexafluoride, photosynthetic quantum efficiency, and partial pressure of CO2) tracers. (4) Employment of neutrally buoyant sediment traps (NBST) and application of the water-column-derived thorium-234 (234Th) method at two depths (i.e., just below the in situ MLD and at the winter MLD), with autonomous profilers equipped with an underwater video profiler (UVP) and a transmissometer. (5) Monitoring of side effects on marine/ocean ecosystems, including production of climate-relevant gases (e.g., nitrous oxide, N2O; dimethyl sulfide, DMS; and halogenated volatile organic compounds, HVOCs), decline in oxygen inventory, and development of toxic algae blooms, with optical-sensor-equipped autonomous moored profilers and/or autonomous benthic vehicles. Lastly, we introduce the scientific aOIF experimental design guidelines for a future Korean Iron Fertilization Experiment in the Southern Ocean (KIFES).
    Description: This research was a part of the project titled the Korean Iron Fertilization Experiment in the Southern Ocean (KOPRI, PM 16060) funded by the Ministry of Oceans and Fisheries, Korea. This work was partly supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (no. 2015R1C1A1A01052051); the Korea-Arctic Ocean Observing System project (K-AOOS) (KOPRI, 20160245) funded by the MOF, Korea; and the KOPRI project (PE18200). Alison M. Macdonald was supported by NOAA grant no. NA11OAR4310063 and internal WHOI funding.
    Repository Name: Woods Hole Open Access Server
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  • 7
    Electronic Resource
    Electronic Resource
    Exchange and crystalline electric fields at R sites in R2Fe14B (R=Tb, Dy, Ho, Er, and Tm) (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 3008-3012 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The R-Fe exchange field and the crystalline-electric-field (CEF) parameters at f and g sites in the R2Fe14B compounds (R=Tb, Dy, Ho, Er, and Tm) are determined by analyzing inelastic neutron-scattering spectra and high-field magnetization curves at low temperatures. The determined R-Fe exchange field and CEF parameters vary monotonously across the series. Different values for the R-Fe exchange field at f and g sites with a ratio of about 1.2 and for the second-order CEF parameter A02 at f and g sites with a ratio of 1.24 have been deduced. By using the determined parameters, our calculations reproduce well the observed first-order magnetization process along the [100] direction in Er2Fe14B and Tm2Fe14B at low temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356167
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  • 8
    Electronic Resource
    Electronic Resource
    Paleozoic sedimentation and tectonics in Korea: A review (2003)
    Melbourne, Australia : Blackwell Science Pty
    The @island arc 12 (2003), S. 0 
    Details
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract  The geological history of the Korean Paleozoic is recorded in lower and upper Paleozoic strata, mostly distributed in two relatively large sedimentary basins, the Taebaeksan and Pyeongnam basins. The lower Paleozoic sedimentary rocks are exclusively of marine origin, dominated by shallow platform carbonate rocks with minor interbedded siliciclastic rocks. The development of the lower Paleozoic sequence was mostly controlled by eustatic changes, having cyclic sedimentation of various temporal scales. During the early Paleozoic the Korean Peninsula was located in a low-latitude tropical region and experienced frequent storm activities. The upper Paleozoic sequence comprises paralic to non-marine rocks with minor limestone intercalations in the lower part of the sequence. Upsection changes in sandstone composition and mudrock geochemistry of the upper Paleozoic Pyeongan Supergroup in the Samcheok coalfield indicate that sediments may have been derived from the continued uplift and unroofing of a collisional orogen source. There exists a great unconformity between the lower and upper Paleozoic strata, which spans the geological time from the Late Ordovician to Early Carboniferous. The unconformity period is conventionally thought to be of non-deposition, but a recent study suggests that it is characterized by continuous sedimentation and significant removal (〉1 km thick) of sediments by erosion. No Paleozoic tectonic history has been addressed so far, and thus it needs further study to elucidate geological events during the middle–late Paleozoic in the Korean Peninsula. Tectonostratigraphic correlation of the Korean Peninsula with neighboring Chinese blocks has been a hot issue for a long time. Although the eastward extension of the Chinese collision belt has been recently suggested to be the Imjingang belt located in the middle of the peninsula, further studies are needed to test this hypothesis because results of recent paleontological, sedimentological and stratigraphic studies on Paleozoic sediments are not in agreement with this possibility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1440-1738.2003.00388.x
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  • 9
    Electronic Resource
    Electronic Resource
    Feldspar albitization in Cretaceous non-marine mudrocks, Gyeongsang Basin, Korea (1998)
    Oxford UK : Blackwell Science Ltd
    Sedimentology 45 (1998), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Plagioclases and K-feldspars in the sandstones and mudrocks of the Cretaceous non-marine Gyeongsang Basin, Korea, were partially to completely albitized. The preservation of fresh plagioclase grains in early micrite-cemented sandstones suggests the diagenetic origin of albite. Albitization textures in mudrocks were examined using backscattered electron images. In contrast to completely albitized plagioclase grains in sandstones, those in mudrocks are mostly partially albitized. It suggests that mudrocks can be more useful for a provenance study than sandstones by preserving detrital minerals better. K-feldspar is unaltered to partially albitized in both sandstones and mudrocks. In mudrocks albitization starts preferentially along microfractures, cleavages and grain margins. Albitization along grain margins seems to be a characteristic feature in mudrocks where development of microfractures in silt-sized feldspar grains by physical compaction is limited by clayey matrix as well as by overpressure. The extent of albitization in mudrocks is mainly controlled by composition of the detrital plagioclase. Mudrocks containing calcic plagioclase grains tend to be more extensively albitized than those containing sodic varieties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3091.1998.00173.x
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    Electronic Resource
    Electronic Resource
    Structure of the catalytic domain of human phosphodiesterase 5 with bound drug molecules (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 425 (2003), S. 98-102 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Phosphodiesterases (PDEs) are a superfamily of enzymes that degrade the intracellular second messengers cyclic AMP and cyclic GMP. As essential regulators of cyclic nucleotide signalling with diverse physiological functions, PDEs are drug targets for the treatment of various diseases, including ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01914
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