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  • 1
    Publication Date: 2016-09-03
    Description: The loose sediments in the Yangtze River Delta, the North China Plain, the plain of Northern Jiangsu and other districts in China are of great thickness, complex in structure and abundant in groundwater. Groundwater overexploitation easily results in geological disasters of land subsidence. Aiming at the issues, assessment models coupling exploitable groundwater resources and land subsidence control in regional loose sediments were brought up in this paper. The two models were: (1) a three dimensional groundwater seepage model with land subsidence based on the one dimensional Terzaghi consolidation theory; (2) a three dimensional full coupling model on groundwater seepage and land subsidence based on the Biot consolidation theory to simulate and calculate. It can be used to simulate and calculate the problems in real situations. Thus, the groundwater seepage and land subsidence were coupled together in the model to evaluate the amount of exploitable groundwater under the specifi...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 2
    Publication Date: 2018-12-04
    Description: Author(s): X. H. Wu (吴鑫辉), Q. B. Chen (陈启博), P. W. Zhao (赵鹏巍), S. Q. Zhang (张双全), and J. Meng (孟杰) We calculate the intraband electromagnetic transitions in the framework of a collective Hamiltonian for chiral and wobbling modes. By going beyond the mean-field approximation on the orientations of the rotational axis, the collective Hamiltonian provides descriptions of both the yrast band and coll... [Phys. Rev. C 98, 064302] Published Mon Dec 03, 2018
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
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  • 3
    Publication Date: 2015-01-17
    Description: Our understanding of when and how humans adapted to living on the Tibetan Plateau at altitudes above 2000 to 3000 meters has been constrained by a paucity of archaeological data. Here we report data sets from the northeastern Tibetan Plateau indicating that the first villages were established only by 5200 calendar years before the present (cal yr B.P.). Using these data, we tested the hypothesis that a novel agropastoral economy facilitated year-round living at higher altitudes since 3600 cal yr B.P. This successful subsistence strategy facilitated the adaptation of farmers-herders to the challenges of global temperature decline during the late Holocene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, F H -- Dong, G H -- Zhang, D J -- Liu, X Y -- Jia, X -- An, C B -- Ma, M M -- Xie, Y W -- Barton, L -- Ren, X Y -- Zhao, Z J -- Wu, X H -- Jones, M K -- New York, N.Y. -- Science. 2015 Jan 16;347(6219):248-50. doi: 10.1126/science.1259172. Epub 2014 Nov 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Key Laboratory of Western China's Environmental Systems (Ministry of Education), Lanzhou University, Lanzhou 730000, China. fhchen@lzu.edu.cn ghdong@lzu.edu.cn. ; Key Laboratory of Western China's Environmental Systems (Ministry of Education), Lanzhou University, Lanzhou 730000, China. ; Department of Anthropology, Washington University in St. Louis, St. Louis, MO 63130-48, USA. ; Center for Comparative Archaeology, Department of Anthropology, University of Pittsburgh, Pittsburgh, PA 15260, USA. ; Qinghai Provincial Institute of Cultural Relics and Archaeology, Xining 810007, China. ; Institute of Archaeology, Chinese Academy of Social Sciences, Beijing 100710, China. ; School of Archaeology and Museology, Peking University, Beijing 100871, China. ; McDonald Institute of Archaeological Research, University of Cambridge, Cambridge CB2 3ER, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25593179" target="_blank"〉PubMed〈/a〉
    Keywords: Acclimatization ; Agriculture/*history ; *Altitude ; Archaeology ; Climate ; History, Ancient ; Humans ; Radiometric Dating ; Temperature ; Tibet
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 2017-08-15
    Description: Author(s): X. H. Wu and H. Shen We study the finite-size effects, like the surface and Coulomb energies, on the hadron-quark mixed phase in neutron stars. The equilibrium conditions for coexisting hadronic and quark phases are derived by minimizing the total energy including the surface and Coulomb contributions, which are differe... [Phys. Rev. C 96, 025802] Published Mon Aug 14, 2017
    Keywords: Nuclear Astrophysics
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
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  • 5
    Publication Date: 2015-10-16
    Description: The hominin record from southern Asia for the early Late Pleistocene epoch is scarce. Well-dated and well-preserved fossils older than approximately 45,000 years that can be unequivocally attributed to Homo sapiens are lacking. Here we present evidence from the newly excavated Fuyan Cave in Daoxian (southern China). This site has provided 47 human teeth dated to more than 80,000 years old, and with an inferred maximum age of 120,000 years. The morphological and metric assessment of this sample supports its unequivocal assignment to H. sapiens. The Daoxian sample is more derived than any other anatomically modern humans, resembling middle-to-late Late Pleistocene specimens and even contemporary humans. Our study shows that fully modern morphologies were present in southern China 30,000-70,000 years earlier than in the Levant and Europe. Our data fill a chronological and geographical gap that is relevant for understanding when H. sapiens first appeared in southern Asia. The Daoxian teeth also support the hypothesis that during the same period, southern China was inhabited by more derived populations than central and northern China. This evidence is important for the study of dispersal routes of modern humans. Finally, our results are relevant to exploring the reasons for the relatively late entry of H. sapiens into Europe. Some studies have investigated how the competition with H. sapiens may have caused Neanderthals' extinction (see ref. 8 and references therein). Notably, although fully modern humans were already present in southern China at least as early as approximately 80,000 years ago, there is no evidence that they entered Europe before approximately 45,000 years ago. This could indicate that H. neanderthalensis was indeed an additional ecological barrier for modern humans, who could only enter Europe when the demise of Neanderthals had already started.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Liu, Wu -- Martinon-Torres, Maria -- Cai, Yan-jun -- Xing, Song -- Tong, Hao-wen -- Pei, Shu-wen -- Sier, Mark Jan -- Wu, Xiao-hong -- Edwards, R Lawrence -- Cheng, Hai -- Li, Yi-yuan -- Yang, Xiong-xin -- de Castro, Jose Maria Bermudez -- Wu, Xiu-jie -- England -- Nature. 2015 Oct 29;526(7575):696-9. doi: 10.1038/nature15696. Epub 2015 Oct 14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China. ; UCL Anthropology, 14 Taviton Street, London WC1H 0BW, UK. ; Departamento de Ciencias Historicas y Geografia. University of Burgos. Hospital del Rey, s/n. 09001 Burgos, Spain. ; Centro Nacional de Investigacion sobre la Evolucion Humana (CENIEH), Paseo Sierra de Atapuerca 3, 09002 Burgos, Spain. ; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xian 710075, China. ; Paleomagnetic Laboratory 'Fort Hoofddijk', Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Budapestlaan 17, 3584 CD Utrecht, The Netherlands. ; Faculty of Archaeology, Leiden University, PO Box 9515, 2300 RA Leiden, The Netherlands. ; School of Archaeology and Museology, Peking University, Beijing 100871, China. ; Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455, USA. ; Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China. ; Institute of Cultural Relics and Archaeology, Hunan Province, Changsha 410008, China. ; Cultural Relics Administration of Daoxian County, Daoxian 425300, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26466566" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 2012-11-01
    Description: Ordovician strata of the South Mayo Trough in western Ireland contain clastic deposits that represent materials eroded from a large and diverse continental area over a time scale that spans much of the Earth’s history. Therefore, it is a useful region to use detrital zircons to construct a continental crustal growth model. Here, we report integrated U–Pb, Lu–Hf and O isotope measurements obtained from in situ analyses of 160 zircons from the South Mayo Trough. U–Pb zircon crystallization ages define three major magmatic episodes of crustal reworking in the Archaean (Lewisian), Mesoproterozoic (Grenville), and Ordovician (Grampian). These data, together with oxygen isotope data and Hf model ages, suggest that crustal growth, recorded in the strata of the South Mayo Trough, started at c. 4 Ga and continued until 1.4 Ga, with two major growth periods at 2.3–2.1 and 2.0–1.5 Ga. We find that the crustal incubation time is decoupled from the duration of supracrustal alteration processes; some zircons with very long crustal incubation times have pristine mantle δ18O signatures suggesting minimal low-temperature surface processing in their source regions. Identifying such zircons is the key for future studies in constructing realistic net continental crustal growth models unaffected by crustal recycling.Supplementary materials: Data tables for U–Pb, Lu–Hf and oxygen isotopes for detrital zircons from South Mayo Trough, as well as plots of values for zircon standards (δ18O for R33, U–Pb ages for 91500 and R33, and 176Hf/177Hf for 91500, GJ-1, and Plešovice) and reverse concordia plots of zircon samples are available at www.geolsoc.org.uk/SUP18543.
    Print ISSN: 0016-7649
    Topics: Geosciences
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  • 7
    Publication Date: 2016-09-27
    Description: To increase the test efficiency of thermal performance of solar collector, a vehicle- mounted test system with high automation, simple operation, good mobility and stability is proposed in this paper. By refitting a medium bus, design of mechanical system and test loop, and using PC control technology, we implemented the vehicle-mounted system and realized effective integration between vehicle and test equipment. A number of tests have been done, and the results show that the vehicle-mounted test system has good parameters and performance and can be widely used to provide door-to-door testing services in the field of solar thermal application.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 3228-3237 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Defect structures were investigated by transmission electron microscopy for GaN/Al2O3 (0001) epilayers grown by metal-organic chemical vapor deposition using a two-step process. The defect structures, including threading dislocations, partial dislocation bounding stacking faults, and inversion domains, were analyzed by diffraction contrast, high-resolution imaging, and convergent beam diffraction. GaN film growth was initiated at 600 °C with a nominal 20 nm nucleation layer. This was followed by high-temperature growth at 1080 °C. The near-interfacial region of the films consists of a mixture of cubic and hexagonal GaN, which is characterized by a high density of stacking faults bounded by Shockley and Frank partial dislocations. The near-interfacial region shows a high density of inversion domains. Above ∼0.5 μm thickness, the film consists of isolated threading dislocations of either pure edge, mixed, or pure screw character with a total density of ∼7×108 cm−2. The threading dislocation reduction in these films is associated with cubic to hexagonal transformation of the nucleation layer region during high temperature growth. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 747-749 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Extended defect reduction in GaN grown by lateral epitaxial overgrowth (LEO) on large-area SiO2/GaN/Al2O3 wafers by low pressure metalorganic chemical vapor deposition is characterized using transmission electron microscopy and atomic force microscopy. The laterally overgrown GaN (LEO GaN) has a rectangular cross section with smooth (0001) and {112¯0} facets. The density of mixed-character and pure edge threading dislocations in the LEO GaN (〈5×106 cm−2) is reduced by at least 3–4 orders of magnitude from that of bulk GaN (∼1010 cm−2). A small number of edge dislocations with line directions parallel to the basal plane are generated between the bulk-like overgrown GaN and the LEO GaN regions as well as at the intersection of adjacent merging LEO GaN stripes. The edge dislocations are most likely generated to accommodate the small misorientation between bulk-like GaN and LEO GaN regions as well as between adjacent single-crystal LEO GaN stripes. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the growth of InGaN/GaN multiple quantum well (MQW) structures, a novel defect (called the "V-defect") initiates at threading dislocations in one of the first quantum wells in a MQW stack. This defect is common to almost all InGaN MQW heterostructures. The nature of the V-defect was evaluated using transmission electron microscopy (TEM), scanning TEM (STEM), and low-temperature cathodoluminescence (CL) on a series of In0.20Ga0.80N/GaN MQW samples. The structure of the V-defect includes buried side-wall quantum wells (on the {101¯1} planes) and an open hexagonal inverted pyramid which is defined by the six {101¯1} planes. Thus, in cross section this defect appears as an open "V". The formation of the V-defect is kinetically controlled by reduced Ga incorporation on the pyramid walls ({101¯1} planes). The V-defect is correlated with the localized excitonic recombination centers that give rise to a long-wavelength shoulder in photoluminescence (PL) and CL spectra. This long-wavelength shoulder has the following characteristics: (i) its intensity is correlated with the side-wall quantum wells; (ii) the temperature independence of the full width at half maximum strongly supports a localized exciton recombination process. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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