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91.
Map sheets have been often used as a basic spatial unit for managing spatial data produced from paper maps. This often results
in incompatibility between adjacent map sheets, because spatial objects do not cross the boundaries smoothly and even the
boundaries themselves do not match their neighbors exactly. To solve the problem this paper proposes a computational procedure
for joining separate map sheets to obtain seamless spatial data. Line objects digitized separately in different map sheets
are considered, which are frequently used to represent road networks, gas pipelines, and boundaries of polygon objects. The
procedure consists of three steps: (1) extraction of end nodes, (2) detection of matching nodes, and (3) transformation of
the map sheet. Each step goes interactively so that unexpected errors can be avoided by human observation. To test the validity
of the procedure, map sheets are combined containing the road network data of Tokyo 23-ku area, Japan.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
92.
W. H. McCutcheon G. Sandell H. E. Matthews T. B. H. Kuiper E. C. Sutton W. C. Danchi T. Sato 《Monthly notices of the Royal Astronomical Society》2000,316(1):152-164
The northern section of the molecular cloud complex NGC 6334 has been mapped in the CO and CS spectral line emission and in continuum emission at a wavelength of 1300 μm. Our observations highlight the two dominant sources, I and I(N), and a host of weaker sources. NGC 6334 I is associated with a cometary ultracompact H ii region and a hot, compact core ≤10 arcsec in size. Mid-infrared and CH3 OH observations indicate that it is also associated with at least two protostellar sources, each of which may drive a molecular outflow. For region I we confirm the extreme high-velocity outflow first discovered by Bachiller & Cernicharo and find that it is very energetic with a mechanical luminosity of 390 L⊙ . A dynamical age for the outflow is ∼3000 yr. We also find a weaker outflow originating from the vicinity of NGC 6334 I. In CO and CS this outflow is quite prominent to the north-west, but much less so on the eastern side of I, where there is very little molecular gas. Spectral survey data show a molecular environment at position I which is rich in methanol, methyl formate and dimethyl ether, with lines ranging in energy up to 900 K above the ground state. NGC 6334 I(N) is more dense than I, but cooler, and has none of the high-excitation lines observed toward I. I(N) also has an associated outflow, but it is less energetic than the outflow from I. The fully sampled continuum map shows a network of filaments, voids and cores, many of which are likely to be sites of star formation. A striking feature is a narrow, linear ridge which defines the western boundary. It is unclear if there is a connection between this filament and the many potential sites of star formation, or if the filament existed prior to the star formation activity. 相似文献
93.
Hisaaki Sato 《Marine Georesources & Geotechnology》2018,36(7):768-780
We propose a geochemical parameter, “metal flux” in evaluating hydrogenetic Co-rich ferromanganese crust deposits in the Pacific seamount area, that is based on physical, chemical, and geological characterization of the integrated growth piles of crusts. We calculated the metal flux for fifteen sites from different depths ranging between 900-6000m from different seamounts. The secular and areal variations of metal flux indicate a strong geological controls, and also can be a reliable tool for estimating an economic potential of the crusts. The Co flux decreases with increasing water depth, followed by almost constant flux of Ni and Mn. The Al and Fe fluxes vary with regions, indicating higher values in the western regions near the island arc probably related to a supply from the Asian continents. The results imply that Co, a redox sensitive metal element, is controlled by redox conditions of seawater, while Fe and Al are by terrigenous input. The metal flux reflects global and regional conditions and controls the compositional diversity of metals, thus consequently, the parameter can be a reliable powerful tool to estimate or single out more potential areas. 相似文献
94.
A monthly mean climatology of the mixed layer depth (MLD) in the North Pacific has been produced by using Argo observations.
The optimum method and parameter for evaluating the MLD from the Argo data are statistically determined. The MLD and its properties
from each density profile were calculated with the method and parameter. The monthly mean climatology of the MLD is computed
on a 2° × 2° grid with more than 30 profiles for each grid. Two bands of deep mixed layer with more than 200 m depth are found
to the north and south of the Kuroshio Extension in the winter climatology, which cannot be reproduced in some previous climatologies.
Early shoaling of the winter mixed layer between 20–30°N, which has been pointed out by previous studies, is also well recognized.
A notable feature suggested by our climatology is that the deepest mixed layer tends to occur about one month before the mixed
layer density peaks in the middle latitudes, especially in the western region, while they tend to coincide with each other
in higher latitudes. 相似文献
95.
It is greatly expected that the relic neutrino background from past supernovae will be detected by Superkamiokande (SK) which is now under construction. We calculate the spectrum and the event rate at SK systematically by using the results of simulations of a supernova explosion and reasonable supernova rates. We also investigate the effect of a cosmological constant, Λ, on the spectrum, since some recent cosmological observations strongly suggest the existence of Λ. We find following results. (1) The spectrum has a peak at about 3 MeV, which is much lower than that of previous estimates (6–10 MeV). (2) The event rate at SK in the range from 10 MeV to 50 MeV, where the relic neutrinos from past supernovae are dominant, is about 25h502(RSN/0.1 yr−1)(nGh50−3/0.02 Mpc−3) events per year, where RSN is the supernova rate in a galaxy, nG is the number density of galaxies, and h50 = H0/(50 km/s Mpc), where H0 is the Hubble constant. (3) The event rate is almost insensitive to Λ. The flux increases in the low energy side (< 10 MeV) with increasing Λ, but decreases in the high energy side (> 10 MeV) in models in which the integrated number of supernovae in one galaxy is fixed. 相似文献
96.
Takenobu Michioka Hiroshi Takimoto Hiroki Ono Ayumu Sato 《Boundary-Layer Meteorology》2018,168(2):247-267
The effects of fetch on turbulent flow and pollutant dispersion within a canopy formed by regularly-spaced cubical objects is investigated using large-eddy simulation. Six tracer gases are simultaneously released from a ground-level continuous pollutant line source placed parallel to the spanwise axis at the first, second, third, fifth, seventh and tenth rows. Beyond the seventh row, the standard deviations of the fluctuations in the velocity components and the Reynolds shear stresses reach nearly equivalent states. Low-frequency turbulent flow is generated near the bottom surface around the first row and develops as the fetch increases. The turbulent flow eventually passes through the canopy at a near-constant interval. The mean concentration within the canopy reaches a near-constant value beyond the seventh row. In the first and second rows, narrow coherent structures frequently affect the pollutant escape from the top of the canopy. These structures increase in width as the fetch increases, and they mainly affect the removal of pollutants from the canopy. 相似文献
97.
High-pressure and ultrahigh-temperature metamorphism at Komateri, northern Madurai Block, southern India 总被引:1,自引:0,他引:1
Toshiaki Tsunogae M. Santosh Hiroyuki Ohyama Kei Sato 《Journal of Asian Earth Sciences》2008,33(5-6):395-413
We report for the first time the evidence for prograde high-pressure (HP) metamorphism preceding a peak ultrahigh-temperature (UHT) event in the northernmost part of the Madurai Block in southern India. Mg–Al-rich Grt–Ged rocks from Komateri in Karur district contain poikiloblastic garnet with numerous multi-phase inclusions. Although most of the inclusion assemblages are composed of gedrite, quartz, and secondary biotite, rare staurolite + sapphirine and spinel + quartz are also present. The XMg (=Mg/[Fe+Mg]) of staurolite (0.45–0.49) is almost consistent with that reported previously from Namakkal district in the Palghat–Cauvery Shear Zone system (XMg = 0.51–0.52), north of the Madurai Block. The HP event was followed by peak UHT metamorphism at T = 880–1040 °C and P = 9.8–12.5 kbar as indicated by thermobarometric computations in the Grt–Ged rock and associated mafic granulite. Symplectic intergrowth of spinel (XMg = 0.50–0.59, ZnO < 1.7 wt.%) and quartz, a diagnostic indicator of UHT metamorphism, probably formed by decompression at UHT conditions. The rocks subsequently underwent retrograde metamorphism at T = 720–760 °C and P = 4.2–5.1 kbar. The P–T conditions and clockwise exhumation trajectory of the Komateri rocks, comparable to similar features recorded from the Palghat–Cauvery Shear Zone system, suggest that the Madurai Block and the Palghat–Cauvery Shear Zone system underwent similar HP and UHT metamorphic history probably related to the continent–continent collision during the final stage of amalgamation of Gondwana supercontinent. 相似文献
98.
Girardi V.A. V. Teixeira W. Bettencourt J.S. Andrade S. Navarro M.S. Sato K. 《《幕》》2008,31(4):392-400
The Amazonian Craton comprises an Archean domain surrounded by four successively younger Proterozoic tectonic provinces. Within the Rio-Negro-Juruena province the Serra da Providencia Intrusive Suite (1.60 and 1.53 Ga) consists of A-type rapakivi gran- ites, charnockites and mangerites genetically associated with diabase dikes, gabbros and amphibolites. The original mafic melts were derived from a depleted mantle source (εN(T) +2.5 to +2.8;εSr(T) -12.1). Underplated mafic magma induced melting of a short-lived felsic crust, thus originating coeval felsic-mafic magmatism in a conti- nental intraplate setting. The Colorado Complex, assigned to the Rondonian-San Ignacio province, comprises 1.35-1.36 Ga intrusive bimodal magmatism represented by monzonite gneisses associated with amphibolite, gabbro and metadiabase dikes intercalated with metasediments with detrital zircon that yield U- Pb ages of 1.35 to 1.42 Ga. Mafic samples dis- play juvenile signatures (εNd(T) 0.0 to +5.2; εSr(T) --5.0 to --30.7) and are less contaminated than the Serra da Previdencia and Nova Brasilandia ones. The generation of the basaltic magma is related to the subduction of an oceanic slab below the peridotite wedge (intraoceanic arc setting). Fluids and/or small melts from the slab impregnated the mantle. The Nova Brasilandia Sequence (Sunsas-Aguapef province) comprises a metasedimentary sequence intruded by 1.10-1.02 Ga metadia- bases, gabbros, meta-gabbros, and amphibolites associated with granitic plutons (bimodal mag- matism). The original tholeiitic magmas, derived from a depleted source (εNd(T) = +3.1 to +5.0), in a proto-oceanic setting, underwent subsequent contamination by the host rocks, as indicated by the isotopic and trace element data. 相似文献
99.
D. E. Smylie Xianhua Jiang B. J. Brennan Kachishige Sato 《Geophysical Journal International》1992,108(2):465-490
100.