scholarly journals Preliminary Computation on Potential Thermal Enenrgy Intake from Thermally Stratified Water Areas

1994 ◽  
Vol 38 ◽  
pp. 229-234
Author(s):  
Kohji MICHIOKU
Keyword(s):  
Preliminary Computation

Impact of the Icelandic hotspot on GPS time series in southeast Greenland

2020 ◽  
Author(s):  
Valentina R. Barletta ◽  
Andrea Bordoni ◽  
Shfaqat Abbas Khan
Keyword(s):  
Time Series ◽  
Greenland Ice Sheet ◽  
Ice Age ◽  
Low Viscosity ◽  
The Earth ◽  
Gps Velocities ◽  
Global Sea Level ◽  
Gps Time Series ◽  
Iceland Plume ◽  
Preliminary Computation

<p>The mass lost from Greenland ice sheet is one of the most important contribution to the global sea level rise, and it is under constant monitoring. However, still little is known about the heat flux at the glacier bedrock, and how it affects dynamics of the major outlet glaciers in Greenland. Recent studies suggest that the hotspot currently under Iceland have been under eastern Greenland at ~40 Ma BP and that the upwelling of hot material from the Iceland plume towards Greenland is ongoing. A warm upper mantle has a low viscosity, which in turn causes the solid Earth to rebound much faster to deglaciation. We have good reasons to believe that mantle beneath SE-Greenland has very low viscosity (Khan, et al. 2016), as also suggested by the discrepancy between the GPS velocities and the predicted purely elastic deformations caused by present-day ice loss. Here we present a preliminary computation of the Earth deformation driven by a low viscosity mantle excited by the deglatiation since the little ice age (LIA) to the present day. We produce the time series of such deformation and compare it with GPS time series, the oldest dating back to 1992.</p>

Feasibility of a 5 T Magnet by using Bi-2223/Ag Tape at 30 K

1999 ◽  
Vol 13 (09n10) ◽  
pp. 1345-1350 ◽  
Author(s):  
A. Matrone ◽  
M. Ariante ◽  
V. Cavaliere ◽  
M. Mariani ◽  
G. Masullo ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Cross Section ◽  
Fill Factor ◽  
Concept Design ◽  
Operating Current ◽  
Preliminary Computation ◽  
The Magnetic Field

The feasibility of a 5 T magnet by using Bi-2223/Ag tapes at 30 K has been investigated. Preliminary computation demonstrates that the target is attainable by assembling 20 double pancakes manufactured by co-winding two Bi-2223/Ag tapes having overall cross-section of 0.25 × 3.5 mm 2 and 25% fill factor, being the expected operating current about 200 A. The pancakes located at the edges are the most critical because the component of the magnetic field orthogonal to the tape surface is large enough to strongly depress J c . To overcome this problem the edge pancakes could be fabricated by using Bi-2223/Ag tapes with new concept design (e.g. with oriented filaments).

scholarly journals Electronic Currents and Anapolar Response Induced in Molecules by Monochromatic Light

Chemistry ◽  
2021 ◽  
Vol 3 (3) ◽  
pp. 1022-1036
Author(s):  
Francesco Ferdinando Summa ◽  
Paolo Lazzeretti
Keyword(s):  
Numerical Integration ◽  
Electric Dipole ◽  
Monochromatic Light ◽  
Electric Quadrupole ◽  
Computational Techniques ◽  
Optical Fields ◽  
Electronic Current ◽  
Chiral Species ◽  
Preliminary Computation ◽  
Preliminary Application

It is shown that the electric dipole- and electric quadrupole–anapole polarizabilities, denoted respectively by fαβ′ and gα,βγ′, and the anapole magnetizability aαβ, are intrinsic properties of the electron cloud of molecules responding to optical fields. fαβ′ is a nonvanishing property of chiral and achiral compounds, whereas aαβ is suitable for enantiomer discrimination of chiral species. They can conveniently be evaluated by numerical integration, employing a formulation complementary to that provided by perturbation theory and relying on the preliminary computation of electronic current density tensors all over the molecular domain. The origin dependence of the dynamic anapolar response is rationalized via related computational techniques employing numerical integration, as well as definitions of molecular property tensors, for example, electric dipole and electric quadrupole polarizabilties and magnetizability. A preliminary application of the theory is reported for the Ra enantiomer of the hydrogen peroxide molecule, evaluating tensor components of electric dipole-anapole polarizability and anapole magnetizability as functions of the dihedral angle ϕ≡∠ H-O-O-H in the range 0∘≤ϕ≤180∘.

Analytical potentiometric data analyses of metal–ligand equilibria by microcomputer. A general procedure for minimizing potential sources of errors and a fast linear-scaled least-squares algorithm

1987 ◽  
Vol 65 (12) ◽  
pp. 2798-2803 ◽  
Author(s):  
Patrick Decock ◽  
Bibudhendra Sarkar
Keyword(s):  
General Procedure ◽  
Formation Constants ◽  
Titration Curves ◽  
Potential Sources ◽  
Free Ion ◽  
Multiple Species ◽  
Preliminary Computation ◽  
Best Fit ◽  
Selection Of ◽  
Potentiometric Data

Analytical potentiometry is a powerful technique to investigate multiple species in solution and their formation constants. However, there have been some difficulties in this method resulting primarily from the theoretical approach. In this paper we critically examined them and improvements have been implemented successfully. Suitable experimental designs are adapted and preliminary computation of potentiometric data are performed to minimize potential sources of errors. Criteria are proposed to choose the best set of titration curves. A correction is introduced to partially minimize the errors originating from the volume variation. A linear-scaled minimization algorithm has been implemented to extract the value of the complex stability constants from the experimental free ion concentrations. This has two advantages over the earlier non-linear minimization process. The execution time is faster and it facilitates the selection of the best fit of species. A series of 14 programs are introduced to run on a low memory microcomputer.

Processing the CAD Model of Sculptured Artifacts for Free-Form Thick-Layered Object Manufacturing

2000 ◽  
Author(s):  
Imre Horváth ◽  
Zoltán Rusák ◽  
Han J. Broek ◽  
Bert Douwes
Keyword(s):  
Cutting Tool ◽  
Free Form ◽  
Cad Model ◽  
Algorithmic Support ◽  
Cad Models ◽  
Speed Up ◽  
Specialized Experts ◽  
High Level ◽  
Sculptured Objects ◽  
Preliminary Computation

Abstract Processing CAD models of large sized, structurally complex, and dominantly sculptured objects for free-form thick-layered object manufacturing (FF-TLOM) is a non-trivial task. Algorithmic support is needed, especially when the applicators of the FF-TLOM technology are not specialized experts. The research team of the authors has developed and programmed a system of such algorithms to prepare NURBS-based assembly models for layered manufacturing, but also to control both the cutting tool and the manufacturing equipment. This paper starts with a brief overview of the FF-TLOM technology and the concept of reducing a CAD model to fabrication elements. Then, it explains the high-level concepts supporting the algorithms, and presents the details of their operation. The logically linked system of algorithms is applied to find the best position for segmentation. The best segmentation orientation can be found in a computation-intensive, multi-criterion optimization process. It is difficult to simplify and speed up, for the valuation of the parameters of the objective function cannot be done without a preliminary computation of the segments and layers.

UAV aerodynamic design involving genetic algorithm and artificial neural network for wing preliminary computation

2019 ◽  
Vol 84 ◽  
pp. 464-483 ◽  
Author(s):  
Abdelwahid Boutemedjet ◽  
Marija Samardžić ◽  
Lamine Rebhi ◽  
Zoran Rajić ◽  
Takieddine Mouada
Keyword(s):  
Neural Network ◽  
Genetic Algorithm ◽  
Artificial Neural Network ◽  
Aerodynamic Design ◽  
Artificial Neural ◽  
Preliminary Computation
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