8,760 research outputs found
General circulation in the atmosphere of Venus driven by polar and diurnal variations of surface temperature
Mathematical model for Venus atmosphere circulation pattern determined by polar and diurnal temperature variation
A methodology for unified hardware-software design
Unified hardware-software design for digital computer
Data synthesis and display programs for wave distribution function analysis
At the National Space Science Data Center (NSSDC) software was written to synthesize and display artificial data for use in developing the methodology of wave distribution analysis. The software comprises two separate interactive programs, one for data synthesis and the other for data display
Why Do We Use New Practices ?
Are new practices and techniques adopted simply because they\u27re discovered and made available? Not unless they\u27re profitable, is the answer that research is giving. Here\u27s an example based on the use of fertilizer in Iowa
Efficient assessment of window views in high-rise, high-density urban areas using 3D color City Information Models
Urban-scale quantification of window views can inform housing selection and
valuation, landscape management, and urban planning. However, window views are
numerous in high-rise, high-density urban areas and current automatic
assessments of window views are inaccurate and time-consuming. Thus, both
accurate and efficient assessment of window views is significant in improving
the automation for urban-scale window view applications. The paper presents an
automatic, accurate, and efficient assessment of window view indices (WVIs) of
greenery, sky, waterbody, and construction using 3D color City Information
Models (CIMs). The workflow includes: i) 3D semantic segmentation of
photorealistic CIM and Digital Surface Model (DSM), and ii) batch computation
of WVIs. Experimental results showed the estimated WVIs were more accurate
(RMSE < 0.01), and the proposed method was more efficient (3.68 times faster)
than Li et al.'s (2022) 2D semantic segmentation. Thus, the proposed method can
facilitate large-scale WVI assessment and update in healthy high-rise,
high-density urban development
An analysis of returns from farm and nonfarm employment opportunities on Shelby-Grundy-Haig soils
The objective of this study is to examine alternative methods for increasing incomes of farm families on Shelby-Grundy-Haig soils of southern Iowa. Prospects for increasing incomes through greater capital use, improved technology, larger farm size, part-time farming and shifts to non-farm occupations are considered. Linear programming is used in deriving optimum farm plans and farm size under various resource situations.
Plans are first computed for typical or modal resource situations on farms of 80, 160 and 210 acres, using current farming techniques of the soil area. These plans provide, for each farm size, a benchmark income figure for comparison of earnings from other farm and non-farm alternatives. The benchmark income for each farm size is first compared with incomes from farm plans where capital is increased and all other resources and technology remain at the benchmark level. Returns on this additional capital are high for all three farm sizes studied. Computed next are increases in income possible from use of improved farming techniques while operating capital and other resources are held constant at the benchmark level. Use of improved techniques with capital held constant also produces high returns. When improved techniques and greater capital are used together, however, the income increases are greater than from either used alone. This complementarity suggests a need for integrated educational and credit programs
Non linear flux flow in TiN superconducting thin film
We have studied the superconducting behavior of 100 nm Titanium Nitride (TiN)
thin film in a perpendicular magnetic field. We found a zero field transition
temperature of 4.6 K and a slope in the H-T plane of -0.745 T/K. At 4.2 K, we
have performed careful transport measurements by measuring both the
differential resistivity and voltage as a function of a DC current. Our results
are analyzed in the framework of linear and non linear flux flow behavior. In
particular, we have observed an electronic instability at high vortex
velocities and from its dependence with respect to the applied magnetic field,
we can exctract the inelastic scattering time and diffusion length of the
quasiparticles
Evolution of superconductivity by oxygen annealing in FeTe0.8S0.2
Oxygen annealing dramatically improved the superconducting properties of
solid-state-reacted FeTe0.8S0.2, which showed only a broad onset of
superconducting transition just after the synthesis. The zero resistivity
appeared and reached 8.5 K by the oxygen annealing at 200\degree C. The
superconducting volume fraction was also enhanced from 0 to almost 100%. The
lattice constants were compressed by the oxygen annealing, indicating that the
evolution of bulk superconductivity in FeTe0.8S0.2 was correlated to the
shrinkage of lattice.Comment: 13 pages, 6 figure
Effect of Strain Relaxation on Magnetotransport properties of epitaxial La_0.7Ca_0.3MnO_3 films
In this paper, we have studied the effect of strain relaxation on
magneto-transport properties of La_0.7Ca_0.3MnO_3 epitaxial films (200 nm
thick), which were deposited by pulsed laser deposition technique under
identical conditions. All the films are epitaxial and have cubic unit cell. The
amount of strain relaxation has been varied by taking three different single
crystal substrates of SrTiO_3, LaAlO_3 and MgO. It has been found that for
thicker films the strain gets relaxed and produces variable amount of disorder
depending on the strength of strain relaxation. The magnitude of lattice
relaxation has been found to be 0.384, 3.057 and 6.411 percent for film
deposited on SrTiO_3, LaAlO_3 and MgO respectively. The films on LaAlO_3 and
SrTiO_3 show higher T_{IM} of 243 K and 217 K respectively as compared to
T_{IM} of 191 K for the film on MgO. Similarly T_C of the films on SrTiO_3 and
LaAlO_3 is sharper and has value of 245 K and 220 K respectively whereas the TC
of the film on MgO is 175 K. Higher degree of relaxation creates more defects
and hence TIM (T_C) of the film on MgO is significantly lower than of SrTiO_3
and LaAlO_3. We have adopted a different approach to correlate the effect of
strain relaxation on magneto-transport properties of LCMO films by evaluating
the resistivity variation through Mott's VRH model. The variable presence of
disorder in these thick films due to lattice relaxation which have been
analyzed through Mott's VRH model provides a strong additional evidence that
the strength of lattice relaxation produces disorder dominantly by increase in
density of defects such as stacking faults, dislocations, etc. which affect the
magneto-transport properties of thick epitaxial La_0.7Ca_0.3MnO_3 films
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