3,569 research outputs found
For multidisciplinary research on the application of remote sensing to water resources problems
Research on the application of remote sensing to problems of water resources was concentrated on sediments and associated nonpoint source pollutants in lakes. Further transfer of the technology of remote sensing and the refinement of equipment and programs for thermal scanning and the digital analysis of images were also addressed
Measurement Theory and General Relativity
The theory of measurement is employed to elucidate the physical basis of
general relativity. For measurements involving phenomena with intrinsic length
or time scales, such scales must in general be negligible compared to the
(translational and rotational) scales characteristic of the motion of the
observer. Thus general relativity is a consistent theory of coincidences so
long as these involve classical point particles and electromagnetic rays
(geometric optics). Wave optics is discussed and the limitations of the
standard theory in this regime are pointed out. A nonlocal theory of
accelerated observers is briefly described that is consistent with observation
and excludes the possibility of existence of a fundamental scalar field in
nature.Comment: LaTeX springer style lamu.cls, 2 figures, 16 pages, published in:
Black Holes: Theory and Observation: Proceedings of the 179th W.E. Heraeus
Seminar, held August 1997 in Bad Honnef, Germany. F.W. Hehl et al.(eds).
(Springer, Berlin Heidelberg 1998
Thermal Evolution and Core Formation on Asteroid 4 Vesta in the Magma Ocean Regime
Geochemical observations of the eucrite and diogenite meteorites, together with observations made by NASAs Dawn spacecraft while orbiting asteroid 4 Vesta, indicate that Vesta has differentiated to form a crust, mantle, and core. Eucrite and diogenite petrology is best explained by solidification of the crust from a magma ocean constituting 60-70% of Vestas silicates [3], or a temperature of ~1550 C. The abundances of moderately siderophile elements (Ni, Co, Mo, W, and P) in eucrites require that essentially all of the metallic phase in Vesta segregated to form a core prior to eucrite formation and likely reached a temperature of 1450- 1575 C. These observations provide important constraints on Vestas thermal evolution. The high inferred temperature indicates that convective heat transport must have been important during part of Vestas thermal evolution. In this study, we model Vestas thermal evolution in the magma ocean regime
Micro-Raman Spectroscopy of Particles in the Mie-size Range: A Short Review
In this paper a short review is given on micro-Raman spectroscopy
where the particles or the dimensions of scattering systems
under investigation are comparable to the wavelength of the exciting
laser light. If the scattering system has well-defined geometries,
e. g. spheres, cylinders, etc., structural resonances can be observed in inelastical light scattering experiments. These resonances can be explained by the well-known Lorenz-Mie-theory. Examples of such Raman-Mie spectra of solid and liquid microspheres, as well as of fibers, are given. A variety of laser light traps are discussed which allow to study such Raman-Mie spectra experimentally
Micro-Raman Spectroscopy of Particles in the Mie-size Range: A Short Review
In this paper a short review is given on micro-Raman spectroscopy
where the particles or the dimensions of scattering systems
under investigation are comparable to the wavelength of the exciting
laser light. If the scattering system has well-defined geometries,
e. g. spheres, cylinders, etc., structural resonances can be observed in inelastical light scattering experiments. These resonances can be explained by the well-known Lorenz-Mie-theory. Examples of such Raman-Mie spectra of solid and liquid microspheres, as well as of fibers, are given. A variety of laser light traps are discussed which allow to study such Raman-Mie spectra experimentally
The Securities and Exchange Commission\u27s 2010 Proxy Access Proposals: A Poison Pill for Corporate Health
The SEC has proposed proxy access rules in the wake of the recent financial crisis. With the stated purpose of removing impediments to the exercise of shareholder voice and increasing director accountability, the proposed rule changes are not without problems. The proposed rules enter a mix in which the corporate governance landscape, shaped by powerful role players, already presents troubling possibilities for activist shareholder abuse. This Article argues that adoption of the proposed rules could be the final piece to a puzzle in which shareholder power is achieved at the expense of long-term corporate health and shareholder value
Thermal conductive connection and method of making same Patent
Thermal conductive, electrically insulated cleavable adhesive connection between electronic module and heat sin
Photosynthetic duration, carboxylation efficiency and stomatal limitation of sun and shade leaves of different ages in field-grown grapevine (Vitis vinifera L.)
The relationship of photosynthesis (A) of grapevine (Vitis vinifera L.) sun and shade leaves of primary and secondary (lateral) shoots to insertion level was investigated over two seasons in the field. The leaf plastochron index (LPI) was used to denote leaf position on the shoot. Additionally, laboratory and field measurements of the response of A to CO2 were conducted. An empirical model was developed to estimate carboxylation efficiency (CE) and stomatal limitations (1) of A. In sun leaves, the relationship of A to LPI changed little until the end of the season (October), whereas stomatal conductance (g) and the intercellular partial pressure of CO2 (ci) increased. Leaves acclimated to low light and leaves older than LPI 5 had 30 % lower A and were operating at a slightly higher ci as sun leaves. During September and October, lateral leaves had highest rates of CO2 assimilation and CE. In mid-October, A and g decreased rapidly and simultaneously for all leaf types, leaf positions and both treatments (sun and shade). Photosynthesis responded similar to individual leaf age as to leaf position. A was linearly related to ci up to non-limiting conductances for sun and shade leaves, for all ages and at all times during the season. The CE and 1 were highest at the beginning of the season and strongly dependent on leaf position. Stomatal limitation declined continuously from about 55 % at the beginning to about 23 and 18 % for sun and shade leaves, respectively, at the end of the season
Wetland mapping from digitized aerial photography
Computer assisted interpretation of small scale aerial imagery was found to be a cost effective and accurate method of mapping complex vegetation patterns if high resolution information is desired. This type of technique is suited for problems such as monitoring changes in species composition due to environmental factors and is a feasible method of monitoring and mapping large areas of wetlands. The technique has the added advantage of being in a computer compatible form which can be transformed into any georeference system of interest
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