Introduction: Myocardial perfusion imaging is a nuclear medicine imaging method that is used to detect coronary artery diseases. One of the main sources of error in this imaging method is the detection of Compton scattered photons in the photopeak energy window used for data acquisition. This results in the degradation of the image contrast, and therefore decreases the...

Gravity data gaps in mountainous areas are nowadays often filled in with the data from airborne gravity surveys. Because of the errors caused by the airborne gravimeter sensors, and because of rough flight conditions, such errors cannot be completely eliminated. The precision of the gravity disturbances generated by the airborne gravimetry is around 3-5 mgal. A major obstacle in using airborne ...

the first step in studying dust events is the estimation of dust emission from sources. in this study, the simulations of the vertical dust flux (vdf) over iran by the mba (marticorena, bergametti, and alfaro) and shao schemes are compared. the mba scheme is energy-based and derived on the basis of energy balance between the kinetic energy of saltating particles and binding energy of the surfac...

The importance of explicitly resolving the Stokes drift in ocean surface modelling is demonstrated by comparing four models with 58,612 observational data points obtained from undrogued drifting buoys Estuary and Gulf St. Lawrence, Canada. Drift model inputs are regional atmosphere circulation, spectral wave models. control considers near-surface currents provided top grid cell circulation mode...

high through put sequencing of single nucleotide polymorphisms (snp) has revolutionized the fine scale analysis of the population structure in different species. various methods have been proposed and used for the study of population structure using whole-genome marker data that each has advantages and disadvantages with respect to their characteristics. super paramagnetic clustering (spc) whic...

The usual satellite image orientation is based on bias corrected rational polynomial coefficients (RPC). The RPC are describing the direct sensor orientation of the satellite images. The locations of the projection centres today are without problems, but an accuracy limit is caused by the attitudes. Very high resolution satellites today are very agile, able to change the pointed area over 200km...

Tropospheric delay models based on GNSS observations are essential for studying tropospheric changes. However, the uneven distribution of stations reduces accuracy in remote areas. Moreover, calculated by traditional models, which rely meteorological parameters, is lower compared to achieved models. At present, there sufficient surface observation facilities around world that can obtain paramet...

We propose a methodology for local gravity field modelling fromgravity data using spherical radial basis functions. The methodology comprises two steps: in step 1, gravity data (gravity anomalies and/or gravity disturbances) are used to estimate the disturbing potential using least-squares techniques. The latter is represented as a linear combination of spherical radial basis functions (SRBFs)....