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51.
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53.
Pauline van den Berg Theo Arentze Harry Timmermans 《Journal of Geographical Systems》2012,14(2):125-141
Recently, there has been an increasing interest in the role of social networks in spatial-choice and travel behavior. It has
been acknowledged that social activities and the travel for these activities can emerge from individuals’ social networks
and that social activities are responsible for an important portion of travel demand. The influence of information and communication
technologies (ICT’s) is also important in this respect. The purpose of the paper is to examine the effects of characteristics
of egos and ego-alter relationships on the frequency of social interaction by different communication modes, using multilevel
path analysis. The analyses are based on social network data collected in 2008 in the Eindhoven region in the Netherlands
among 116 respondents. The results indicate a complementary relationship between contact frequencies by different modes. The
contact frequencies of the different modes, especially face-to-face and telephone, can also be largely explained by the ego’s
personal characteristics and the type of relationship and the distance between ego and alter. 相似文献
54.
Chineke Theo Chidiezie 《大气科学》1997,21(5):638-640
本文目的在于描述热带湿润气候中局地天气预报的各种方法。文中所给的结果在大多数情况下是可靠的。 相似文献
55.
The tilt correction servo for the Sydney University Stellar Interferometer (SUSI) consists of a 'pyramid' detector and piezo-electrically controlled tilt mirrors. The system measures image position and re-centers it with a sample frequency of 1000 Hz thereby holding the two beams of the interferometer parallel with a standard deviation of 0.164 ± 0.025 arcseconds. With an aperture size of 0.06 metres this implies less than a 2% loss in the visibility measurements made by SUSI. The servo has been used to magnitude 6.5 stars and is predicted to have a limiting magnitude of 7.5 and possibly as high as 8.5. The system not only corrects for the tilt introduced by the atmosphere but will supply a good estimate of seeing conditions using the same optical path through the atmosphere as the visibility measurements of the interferometer. 相似文献
56.
57.
A non-linear non-hydrostatic model (MIT-gcm) is used to study the generation and propagation of internal tides. The model domain covers a continental slope and neighbouring parts of the deep ocean and shelf. Uniformity in the along-slope direction is assumed. We focus on the non-linear evolution of the internal tide once generated. In particular, we show that in the main region of generation, over the upper part of the slope, small-scale features occur, indicative of breaking and mixing. Far from the generation region, non-linear processes are important in the reflection of the beam at the bottom, where higher harmonics are generated. This implies an energy transfer toward higher frequencies and the resulting shape of the energy spectra is consistent with observations. Turbulent and mixing processes are analysed by employing an adiabatic sorting method; thus, we calculate the development in time of the available potential energy, the variation in the background potential energy due to irreversible processes, and the distribution of the Cox number (the local turbulent diffusivity normalized by the background diffusivity) over the slope. With rotation, the transfer of energy to higher harmonics is reduced. 相似文献
58.
The Seasat altimeter data has been completely adjusted by a crossing arc technique to reduce the crossover discrepancies to
approximately ±30 cm in five regional adjustments. This data was then used to create sea surface heights at 1° intersections
in the ocean areas with respect to the GRS80 ellipsoid. These heights excluded the direct tidal effects but included the induced
permanent deformation.
A geoid corresponding to these sea surface heights was computed, based on the potential coefficients of the GEML2 gravity
field up to degree 6, augmented by Rapp's coefficients up to degree 180. The differences between sea surface heights and the
geoid were computed to give approximate estimates of sea surface topography. These estimates are dominated by errors in both
sea surface heights and geoid undulations. To optimally determine sea surface topography a spherical harmonic analysis of
raw estimates was carried out and the series was further truncated at degree 6, giving estimates with minimum wavelengths
on the order of 6000 km.
The direction of current flow can be computed on a global basis using the spherical harmonic expansion of the sea surface
topography. Ths has been done, not only for Seasat/GEML2 estimates, but also using the recent dynamic topography estimates
of Levitus. The results of the two solutions are very similar and agree well with the major circulation features of the oceans. 相似文献
59.
The key to ‘sustainable conjunctive use of groundwater for additional irrigation’ is the salt balance of groundwater below an irrigated field. This paper aims to develop a mathematical tool to study the accumulation of salt in the groundwater below an irrigated field as caused by irrigation recirculation. This study derives a salt balance of groundwater to ensure that the additional irrigation from groundwater remains possible in the future. The water and salt budgets by themselves do neither provide information concerning farmers' options nor on the limits of the individual terms in the budget equations. It is presumed that farmers will intuitively aim for (1) an optimal value of the actual evapotranspiration, and (2) a return flow as a feasible low fraction of the available water. We, therefore, derive the irrigation from groundwater Q as a consequence of the predefined farmers' aims to achieve a high actual evapotranspiration in combination with a given optimally used irrigation system. Our model concludes that the required amount of drainage is only dependent on the ratio of the salinity in the surface irrigation water and the acceptable salinity of the groundwater. The final salinity in the saturated zone only depends on salt‐carrying inflows and outflows. From the aforesaid model, it is further concluded that sustainable conjunctive use of groundwater for additional irrigation requires long‐term salt management, which should be founded on the essential controlling factors as derived in this paper. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
60.
S. Savin L. Zelenyi V. Budaev J. Buechner M. Balikhin V.E. Korepanov V. Kudryashov L. Lezhen Z. Nemecek D. Novikov J.L. Rauch S. Romanov A. Skalsky 《Planetary and Space Science》2011,59(7):606-617
The scientific rationale of the ROY multi-satellite mission addresses multiscale investigations of plasma processes in the key magnetospheric regions with strong plasma gradients, turbulence and magnetic field annihilation in the range from electron inertial length to MHD scales.The main scientific aims of ROY mission include explorations of:
- (a)
- turbulence on a non-uniform background as a keystone for transport processes;
- (b)
- structures and jets in plasma flows associated with anomalously large concentration of kinetic energy; their impact on the energy balance and boundary formation;
- (c)
- transport barriers: plasma separation and mixing, Alfvenic collapse of magnetic field lines and turbulent dissipation of kinetic energy;
- (d)
- self-organized versus forced reconnection of magnetic field lines;
- (e)
- collisionless shocks, plasma discontinuities and associated particle acceleration processes.
- •
- simultaneous sampling of low- and high-latitudes magnetopause, bow shock and geomagnetic tail at the same local time;
- •
- tracing of magnetosheath streamlines from the bow shock to near-Earth geomagnetic tail;
- •
- passing “through” the SCOPE on the inbound orbit leg;
- •
- common measurements (with SCOPE and other equatorial spacecraft) at distances of ∼ few thousand km for durations of ∼several hours per orbit.