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排序方式: 共有141条查询结果,搜索用时 31 毫秒
1.
Osamu Kameya Tatsuhiko Hasegawa Naomi Hirano Munezo Seki Makoto Tosa Yoshiaki Taniguchi Keiya Takakubo 《Astrophysics and Space Science》1986,118(1-2):449-451
CS(J=1–0), C34S(J=1–0), and CH3OH(10–00A and E) emission lines in the core region of molecular cloud associated with NGC 7538 have been surveyed at angular resolution of 33. Distribution of CS column density shows two prominent peaks. Both blue and red wings in CS line are most prominent at 30 northwest of IRS 11.Paper presented at the IAU Third Asian-Pacific Regional Meeting, held in Kyoto, Japan, between 30 September–6 October, 1984.This work was carried out under the common use observation program at the Nobeyama Radio Observatory (NRO). NRO, a branch of the Tokyo Astronomical Observatory, University of Tokyo, is a cosmic radio observing facility open to outside users. 相似文献
2.
Gas-liquid chromatographic method byGehrke
et al. was applied to the determination of the dissolved proteinaceous substace. Sea-water samples were evaporated in vacuum to the volume of one twentieth of the initial volume and separated from deposited inorganic salt crystals. Thirteen kinds of amino acids except histidine, arginine and cystine were quantitatively determined for artificial sea water containing sixteen standard amino acids with accuracy of about five percent and with yield of 80 to 103 percent. This method has advantage comparing with paper or thin layer chromatography on the precision and comparing with ion-exchange method on sensitivity.The difference of amino acid concentration between the sea-water samples of different depth and different region was observed. The total amounts of dissolved amino acids were found to be between 33 and 92g per liter in sea water of Pacific Ocean taken at the surface to 1,500 m in depth.Contribution No. 41, from The Research Institute of North Pacific Fisheries, Hokkaido University. 相似文献
3.
Historical GEK data provided by JODC is analyzed to investigate the characteristic variation in velocity of the Kuroshio, with special reference to the formation of small meanders south of Kyûshû. It is found that, during or prior to the period of small meander formation, there is a tendency for an abrupt increase in the current velocity west of Yaku-Shima (Yaku-Island), representing an increase in the main current intensity upstream. Also, there are apparent time lags in the variation in current velocity along the path of the Kuroshio between the upstream and the downstream regions of the small meander area. Namely, it is apparent that the increase in Kuroshio velocity in the Satsunan Strait procedes that offshore of Shikoku during the period of the small meander formation, by the order of one month. These results indicate that a nonlinear effect due to the increase in current velocity is a possible cause of the generation of small meanders. 相似文献
4.
A formulation for the aerodynamic roughness length of air flow over wind waves $$z_0 = \gamma {\text{ }}u_* /\sigma p$$ which was proposed by Toba (1979) and Toba and Koga (1986) from dimensional considerations with some data analysis, is shown to correspond with a formulation for irregular solid surfaces $$(z_0 /h) = a(h/l)^{1 + \beta } $$ which resulted from work by Woodinget al. (1973) and Kustas and Brutsaert (1986);u * is the friction velocity,σ p the spectral peak frequency of wind waves,h the mean height of the solid obstacles,l the mean distance between their crests, andα,Β, andγ are constants. This correspondence is reached by the existence of a statistical 3/2-power law and an effective dispersion relationship for wind waves. Because both approaches of parameterizingz 0 were arrived at independently, they provide each other mutual reinforcement. 相似文献
5.
Yoshihiko Sekine Fukuji Yamada Yoshiaki Toba Eugene C. Lafond 《Journal of Oceanography》1994,50(4):391-401
Two-dimensional temperature data observed by use of a 275 meter towed thermistor chain deployed from an oceanographic research vessel USS MARYSVILLE, which cruised with a speed of 6.2 knots in July 1966 across the Kuroshio Extension in the North Pacific, are investigated. Two-dimensional variations of the distribution of the isotherms along the ship's track are analyzed with special reference to their slope, wavelength and wave height. The results show that the slope and wave height of isotherms have a tendency to increase as the temperature decreases. Even if the contribution of wave heights smaller than 1.5 m is neglected, i.e., contribution of large scale slope with a horizontal scale of 5–30 km is subtracted, this tendency is still detected. In contrast to this, the wavelength evaluated by the crest to crest method has no dependency on the temperature. Power spectrum of the isotherm depth is proportional tok
–1.87 for 13°C andk
–2.13 for 27°C, wherek is the wave number. It is shown that the spectra of warmer isotherms are relatively well approximated by –2 power law (Garrett and Munk spectrum) for internal waves rather than the –5/3 power law (Kolmogorov spectrum) for three dimensional isotropic turbulence. 相似文献
6.
Ikuo Yoshikawa Hiroshi Kawamura Kuniaki Okuda Yoshiaki Toba 《Journal of Oceanography》1988,44(3):143-156
The structure of the turbulent boundary layer underneath laboratory wind waves was studied by using a combination of a high-sensitivity thermometer array with a two-component sonic flowmeter. The temperature fluctuations are used to detect movements of water parcels, with temperature as a passive quantity. The turbulence energy was dominant in the frequency range (0.01 0.1 Hz), which was much smaller than the wind-wave frequency (2 5 Hz), and in which the turbulence was anisotropic. There was a frequency range (0.2 2 Hz for velocity, 0.2 5 Hz for temperature fluctuation) where the turbulence was isotropic and had a –5/3 slope in the energy spectrum. These points are the same as those in previous works. However, by analyses of the time series by using a variable-interval time-averaging technique (VITA), it has been found that conspicuous events in this main turbulence energy band are the downward bursting from the vicinity of the water surface. Thus the structure of the water layer underneath the wind waves has characters which are similar to the familiar turbulent boundary layer over a rough solid wall, as already conceived. It has been found that, at the same time, the turbulence energy can be related to quantities of the wind waves (the root mean squared water level fluctuation and the wave peak frequency), for different wind and wave conditions. That is, the turbulence underneath the wind waves develops under a close coupling with the wind waves. 相似文献
7.
This paper describes experiments on interfacial phenomena in a stratified shear flow having a sharp velocity shear at a density
interface. The interface was visualized in vertical cross-section using dye, and the flow pattern was traced using aluminum
powder. Two kinds of internal waves with different phase velocities and wave profiles were observed. They are here named p(positive)-waves
and n(negative)-waves, respectively. By means of a two-dimensional visualization technique, the following facts have been
confirmed regarding these waves. (1) The two kinds of waves propagate in the opposite direction relative to a system moving
with the mean velocity at the interface, and their dispersion relations approximately agree with the two solutions of interfacial
waves in a two-layer system of a linear basic shear flow. (2) The p-wave has sharp crests and flat troughs, and the n-wave
has the reverse of this. This difference in wave profile is due to the finite amplitude effect. (3) Phase velocity of each
wave lies within the range of the mean velocity profile, so that a critical layer exists and each wave has a “cat's eye” flow
pattern in the vicinity of the critical layer, when observed in a system moving with the phase velocity. Consequently, these
two waves are symmetrical with respect to the interface. The mechanisms of generation of these waves, and the entrainment
process are discussed. It is inferred that when the “cat's eye” flow pattern is distorted and a stagnation point approaches
the interface, entrainment in the form of a stretched wisp from the lower to the upper layer occurs for the p-wave, and from
the upper to the lower layer for the n-wave. 相似文献
8.
Mean monthly records of coastal sea surface temperature data (CSST) obtained from stations along the Japanese coasts of the Japan Sea and from those in the related seas for the period 1941–1984 were analyzed by using various methods of time series analysis, for the purpose of clarifying the nature of the year-to-year variations of the state of the Japan Sea. The year-to-year variations in the Japan Sea were found to be closely related to those in the East China Sea and in the western North Pacific. Specific results are as follows. (1) A sudden cooling in the early 1960's occurred in the southern stations of the Japan Sea and continued to the end of the analyzed data. (2) Variations, with about a 6-year periodicity, were observed at most stations, and were especially dominant in the southern stations of the Japan Sea (3) These variations could be traced back to the Kuroshio region of the East China Sea. (4) Variations, with about a 10-year periodicity, were also observed in the northern stations of the Japan Sea. 相似文献
9.
Priestley’s 1959 discussion concerning the estimations of momentum flux and of heat flux from profile observations of wind
and temperature, stating that the closeness of the curve fitting is deceptive, is first critically re-examined. Then a method
is proposed to estimate vertical flux of momentum and heat over the water surface, from the combined data of of wind speed
and temperature are assumed to have similar log-linear profiles, and the most probable profiles are determined by applying
the method of least squares simultaneously to wind and temperature data. Consequently, the most probable values of vertical
flux of momentum and heat may be estimated to satisfy as much as possible observed data of both wind and temperature simultaneously.
The coefficient of the linear term of the log-linear profile, which is treated as an indeterminate coefficient in this method,
may be determined from each observed data as a function of stability length. By tentatively applying the method to Rider’s
1954 data it is found that the coefficient shows a characteristic behavior with the stability length. 相似文献
10.
A method for the prediction of ocean waves was developed on the basis of the single-parameter growth equation of wind waves, proposed byToba (1978) on the basis of similarity in growing wind waves. The applicability of the method to actual problems was tested by hindcasting the wave characteristics with the method, for two cases with differing time and space scales, one in Kii Channel Approach, Japan, and the other in the North Atlantic Ocean. The results showed that the present method can predict waves within an error of 1.3 m in wave heights, which ranged from 3 to 12 m. 相似文献