Results 191 to 200 of about 6,644,877 (248)

Investigation of levels of perfluoroalkyl substances in surface water, sediment and fish tissue in New Jersey, USA.

Science of the Total Environment, 2020
Per- and polyfluoroalkyl substances (PFAS) are persistent, bioaccumulative, and toxic substances found in New Jersey (NJ) due to historic and current industrial activities and the use of aqueous film forming foams. This research documents PFAS occurrence
S. Goodrow, B. Ruppel, R. Lippincott, G. Post, N. Procopio   +4 more
semanticscholar   +1 more source

Reference measurements of low levels of 60Co in steel

Applied Radiation and Isotopes, 2004
Analysis of 60Co traces in the matrix steel has recently gained in importance. This paper deals with the low-level gamma-ray spectrometry measurements that were part of a recent German survey aiming at determining the present levels of artificial radionuclides in commercial steel.
Köhler, M, Hult, M, Arnold, D, Laubenstein, M, Reyss, J.-L   +4 more
openaire   +3 more sources

Digital Twin as a Service (DTaaS) in Industry 4.0: An Architecture Reference Model

Advanced Engineering Informatics, 2021
Recent findings have shown that Digital Twin served multiple constituencies. However, the dilemma between the scope and scale needs a sophisticated reference architecture, a right set of technologies, and a suitable business model.
Shohin Aheleroff, X. Xu, R. Zhong, Yuqian Lu   +3 more
semanticscholar   +1 more source

Evolution of diagnostic reference levels in Spanish intraoral radiology

Radiation Protection Dosimetry, 2012
A total of 16 175 official reports of quality assurance on dental radiodiagnostic surgeries from 16 Spanish autonomous regions compiled during 2002-09 were studied to determine the evolution of diagnostic reference levels (DRLs) for obtaining a diagnostic image in the normal conditions of clinical practice in Spanish dental clinics.
M, Alcaraz, F, Velasco, Y, Martínez-Beneyto, M, Alcaraz-Saura, E, Velasco, G D, Achel, M, Canteras   +6 more
openaire   +2 more sources

Determination of the Normal Hearing Reference Level

The Journal of the Acoustical Society of America, 1956
The auditory thresholds of two groups of “fairgoers” were examined at the Wisconsin State Fair in 1954 and 1955. Each group was tested with pure tones with a view to determining the reference level of normal hearing. The first group consisted of 3500 persons between 10 and 79 years of age.
Aram Glorig, William Grings, Douglas E. Wheeler, Robert R. Quiggle   +3 more
openaire   +1 more source

Diagnostic reference level of computed tomography (CT) in japan

Radiation Protection Dosimetry, 2011
Optimisation of computed tomography (CT) parameters is important in avoiding excess radiation exposure. The aim of this study is to establish the diagnostic reference levels (DRL) of CT in Japan by using dose-length product (DLP). Datasheets were sent to all hospitals/clinics which had CT scanner(s) in Gunma prefecture.
Yasuhiro, Fukushima, Yoshito, Tsushima, Hiroyuki, Takei, Ayako, Taketomi-Takahashi, Hidenori, Otake, Keigo, Endo   +5 more
openaire   +2 more sources

Two Levels of Reference Service in a Municipal Reference Library

The Reference Librarian, 1988
Chicago's Municipal Reference Library (MRL) is a busy governmental library which serves a two-fold public: it serves city employees (approximately 36,000 of them) as a special library and the public as a reference library. This creates problems for the reference librarian: remembering who receives which services, often "switching gears" while working ...
openaire   +1 more source

Reference materials at emission levels of NH 3 and HCl

Fresenius' Journal of Analytical Chemistry, 2001
Due to instability in static mixtures, in the past only dynamic preparation techniques for mixtures of NH3 and HCl were maintained; however, recent developments of new passivation techniques for cylinder treatment and commercially available nitrogen with a very low content of impurities have opened up the possibility of preparing stable mixtures in ...
J I, van Wijk, G, Nieuwenkamp, T L, Hafkenscheid   +2 more
openaire   +2 more sources

Multiple Level of Referents in Information State

2012
As we strive for sophisticated machine translation and reliable information extraction, we have launched a subproject pertaining to the practical elaboration of "intensional" levels of discourse referents in the framework of a representational dynamic discourse semantics, the DRT-based [14] ℜReALIS [2], and the implementation of resulting ...
Gábor Alberti, Márton Károly
openaire   +1 more source

Construction of mm‐Level Terrestrial Reference Frame

Chinese Journal of Geophysics, 2009
AbstractIt is noted in this paper that the latest international terrestrial reference frame ITRF2005 cannot satisfy the current need of monitoring mm‐level terrestrial dynamic change. The strategy of using the latest results of ITRF2005, SBL/GGFC (Special Bureau for Loading/Global Geophysical Fluids Center), GRACE and other satellites to construct mm ...
openaire   +1 more source