Search results for "Standard"
showing 10 items of 3299 documents
Saturated absorption spectroscopy: elimination of crossover resonances by use of a nanocell
2007
It is demonstrated that velocity selective optical pumping/saturation resonances of reduced absorption in a Rb vapor nanocell with thickness \textit{L=} $\lambda $, 2$\lambda $, and 3$\lambda $ (resonant wavelength $\lambda $ = 780 nm) allow the complete elimination of crossover (CO) resonances. We observe well pronounced resonances corresponding to the F$_{g}=3$ $\to $ F$_{e}=2,3,4$ hyperfine transitions of the $^{85}$Rb D$_{2}$ line with linewidths close to the natural width. A small CO resonance located midway between F$_{g}=3$ $\to $ F$_{e}=3$ and F$_{g}=3$ $\to$ F$_{e}=4$ transitions appears only for \textit{L} = 4$\lambda $. The D$_{2}$ line ($\lambda $ = 852 nm) in a Cs nanocell exhi…
The spanish banks in face of the corporate social responsibility Standards: previous analysis of the financial crisis
2013
Transparency of information in the field of CSR (Corporate Social Responsibility) is common to various standards. In recent years there has been a proliferation of standards and models for the formalization of CSR strategies. The objective is to assess the degree of implementation of standards of normalization. The analysis was conducted with data from the year 2008, coinciding with the first signs of the financial crisis, serving as a reference point to analyze the effect of the crisis. The field work was conducted using a survey answered by 57 Spanish credit institutions. We found a low degree of implementation of standards. The GRI (Global Reporting Initiative) and the ISO 14001 stood ou…
Measurement of the single-top-quark production cross section at CDF.
2008
We report a measurement of the single top quark production cross section in 2.2 ~fb-1 of p-pbar collision data collected by the Collider Detector at Fermilab at sqrt{s}=1.96 TeV. Candidate events are classified as signal-like by three parallel analyses which use likelihood, matrix element, and neural network discriminants. These results are combined in order to improve the sensitivity. We observe a signal consistent with the standard model prediction, but inconsistent with the background-only model by 3.7 standard deviations with a median expected sensitivity of 4.9 standard deviations. We measure a cross section of 2.2 +0.7 -0.6(stat+sys) pb, extract the CKM matrix element value |V_{tb}|=0…
La elección del momento oportuno de la política ambiental en un mercado duopolístico
2015
[EN] In this paper the strategic use of innovation by two polluting firms to influence environ-mental policy is evaluated. The analysis is carried out by comparing two alternative policy regimes for two policy instruments: Taxes and standards. The first of the regimes assumes that the regulator commits to an ex-ante level of the policy instrument. In the second one, there is no commitment. The results show that when there is no commitment and a tax is used to control emissions, the strategic behavior of firms can be welfare improving if the efficiency of the clean technology is relatively low. If this is not the case, the strategic behavior of the duopolists has a detrimental effect on welf…
Intended Learning Outcomes of Seven Finnish B.Sc. in IT Programs
2021
Defining the intended learning outcomes is a significant part of curriculum design. Especially,the program-level competence requirements outline the objectives of the education, align the more detailed program structures and content of the curriculum, and create the basis for constructive alignment. Several different bodies aim at defining the goals of engineering programs on different levelsof abstraction.Some of these documents can be considered as statements of the 'minimum threshold'.Respectively, others provide detailed guidelines to support the design of post-secondary programsin specific engineering fields. For example, the CDIO Initiative has defined a general reference syllabus aim…
Standardvarietäten in finnischen DaF- und EFL-Lehrwerken : Ein Vergleich zwischen Deutsch-Lehrwerken und Englisch-Lehrwerken
2010
Englanti ja saksa ovat kieliä, jotka ovat virallisia kieliä useammassa maassa eli niillä on useampi standardivarieteetti. Tällöin puhutaan kielen plurisentrisyydestä. Standardivarieteettien tunteminen on oleellinen osa kommunikatiivista kompetenssia ja oppilaan kielitaitoa. Tässä työssä tutkittiin, miten suomalaiset englannin ja saksan vieraankielen oppikirjat ottavat huomioon kielen plurisentrisyyden ja sen eri standardivarieteetit. Tavoitteena oli tutkia, millainen rooli kullakin standardivarieteetilla oppikirjassa on, missä järjestyksessä varieteetit tulevat opinpolulla esiin, mitä kielen aspekteja, esim. sanasto ja ääntäminen, oppikirjat standardivarieteeteista esittelevät. Tavoitteena …
Sparse Sampling and Maximum Likelihood Estimation for Boolean Models
1991
A condition for practical independence of contact distribution functions in Boolean models is obtained. This result allows the authors to use maximum likelihcod methods, via sparse sampling, for estimating unknown parameters of an isotropic Boolean model. The second part of this paper is devoted to a simulation study of the proposed method. AMS classification: 60D05
Assessing the quality of studies in meta-research: Review/guidelines on the most important quality assessment tools
2020
Systematic reviews and meta-analyses pool data from individual studies to generate a higher level of evidence to be evaluated by guidelines. These reviews ultimately guide clinicians and stakeholders in health-related decisions. However, the informativeness and quality of evidence synthesis inherently depend on the quality of what has been pooled into meta-research projects. Moreover, beyond the quality of included individual studies, only a methodologically correct process, in relation to systematic reviews and meta-analyses themselves, can produce a reliable and valid evidence synthesis. Hence, quality of meta-research projects also affects evidence synthesis reliability. In this overview…
A new mathematical approach for the estimation of the AUC and its variability under different experimental designs in preclinical studies
2011
The aim of the present work was to develop a new mathematical method for estimating the area under the curve (AUC) and its variability that could be applied in different preclinical experimental designs and amenable to be implemented in standard calculation worksheets. In order to assess the usefulness of the new approach, different experimental scenarios were studied and the results were compared with those obtained with commonly used software: WinNonlin® and Phoenix WinNonlin®. The results do not show statistical differences among the AUC values obtained by both procedures, but the new method appears to be a better estimator of the AUC standard error, measured as the coverage of 95% confi…
Modeling temperature effects on mortality: multiple segmented relationships with common break points.
2008
We present a model for estimation of temperature effects on mortality that is able to capture jointly the typical features of every temperature-death relationship, that is, nonlinearity and delayed effect of cold and heat over a few days. Using a segmented approximation along with a doubly penalized spline-based distributed lag parameterization, estimates and relevant standard errors of the cold- and heat-related risks and the heat tolerance are provided. The model is applied to data from Milano, Italy.