User profiles for "author:T Ptak"

Thomas Ptak

- Verified email at umm.edu - Cited by 2010

Thomas Ptak

- Verified email at txstate.edu - Cited by 327

Tracer tests for the investigation of heterogeneous porous media and stochastic modelling of flow and transport—a review of some recent developments

T Ptak, M Piepenbrink, E Martac - Journal of hydrology, 2004 - Elsevier
In heterogeneous porous aquifers, simulations and predictions of groundwater flow and
solute (contaminant) transport require detailed knowledge of aquifer parameters and their …

Quantitative neuropathology by high resolution magic angle spinning proton magnetic resonance spectroscopy

LL Cheng, MJ Ma, L Becerra, T Ptak… - Proceedings of the …, 1997 - National Acad Sciences
We describe a method that directly relates tissue neuropathological analysis to medical
imaging. Presently, only indirect and often tenuous relationships are made between imaging …

Investigation of apparent diffusion coefficient and diffusion tensor anisotropy in acute and chronic multiple sclerosis lesions

AL Tievsky, T Ptak, J Farkas - American Journal of …, 1999 - Am Soc Neuroradiology
BACKGROUND AND PURPOSE: The various stages of multiple sclerosis (MS) are
characterized by de-and remyelination as well as by inflammation. Diffusion MR imaging is …

Itopride in functional dyspepsia: results of two phase III multicentre, randomised, double-blind, placebo-controlled trials

NJ Talley, J Tack, T Ptak, R Gupta, M Giguere - Gut, 2008 - gut.bmj.com
Background: Functional dyspepsia (FD) is a common disorder but there is currently little
efficacious drug therapy. Itopride, a prokinetic approved in several countries, showed …

Critically evaluating the purported global “boom” in small hydropower development through spatial and temporal analysis

T Ptak, A Crootof, T Harlan, S Kelly - Renewable and Sustainable Energy …, 2022 - Elsevier
Due to a rapid proliferation of small hydropower (SHP) in many parts of the world, a
purported boom in SHP development globally has captured significant attention in recent …

Borders resurgent: towards a post-Covid-19 global border regime?

SM Radil, J Castan Pinos, T Ptak - Space and Polity, 2021 - Taylor & Francis
An immediate political geographic consequence of the global pandemic is the rapid
imposition of national and subnational borders, particularly where cross-boundary openness …

Radiation dose is reduced with a single-pass whole-body multi–detector row CT trauma protocol compared with a conventional segmented method: initial experience

T Ptak, JT Rhea, RA Novelline - Radiology, 2003 - pubs.rsna.org
Radiation dose data were collected from a calibrated multi–detector row computed
tomographic (CT) scanner during trauma CT. One protocol (used with 10 case subjects) …

Imaging of head trauma

S Rincon, R Gupta, T Ptak - Handbook of clinical neurology, 2016 - Elsevier
Imaging is an indispensable part of the initial assessment and subsequent management of
patients with head trauma. Initially, it is important for diagnosing the extent of injury and the …

Quantification of mass fluxes and natural attenuation rates at an industrial site with a limited monitoring network: a case study

A Bockelmann, D Zamfirescu, T Ptak… - Journal of Contaminant …, 2003 - Elsevier
At many “real world” field sites, the number of available monitoring wells is limited due to
economic or geological reasons. Under such restricted conditions, it is difficult to perform a …

Modelling the effects of tides and storm surges on coastal aquifers using a coupled surface–subsurface approach

J Yang, T Graf, M Herold, T Ptak - Journal of contaminant hydrology, 2013 - Elsevier
Coastal aquifers are complex hydrologic systems because many physical processes
interact:(i) variably saturated flow,(ii) spatial–temporal fluid density variations,(iii) tidal …