Lead Screening Off Radar for Urban Youths

2006 ◽  
Vol 36 (18) ◽  
pp. 59
Author(s):  
ERIK GOLDMAN
Keyword(s):  
2018 ◽  
Vol 52 (4) ◽  
pp. 39
Author(s):  
Jan Czerniawski

Dowód twierdzenia Bella sprowadza się do wyprowadzenia którejś z nierówności Bella. W ich standardowych wyprowadzeniach jednak kluczową rolę odgrywa warunek faktoryzowalności łącznego prawdopodobieństwa warunkowego, który można uzyskać jako konsekwencję dwóch innych warunków, znanych jako parameter independence i outcome independence. Pierwszy z nich jest dość oczywistym wyrazem warunku lokalności, natomiast drugi budzi wątpliwości. Ponieważ jednak jest on uszczegółowieniem warunku screening off zasady wspólnej przyczyny, jego podważenie wymagałoby zakwestionowania również tego warunku. Gdyby się to powiodło, efektywny dowód twierdzenia Bella wymagałby wyprowadzenia nierówności Bella nie wykorzystującego żadnego uszczegółowienia warunku screening off. Przestawiona zostanie sugestia kierunku, w jakim powinny iść poszukiwania modelu naruszającego ten warunek.


1992 ◽  
Vol 59 (1) ◽  
pp. 142-152 ◽  
Author(s):  
Elliott Sober

Erkenntnis ◽  
2021 ◽  
Author(s):  
David Atkinson ◽  
Jeanne Peijnenburg

AbstractAs is well known, implication is transitive but probabilistic support is not. Eells and Sober, followed by Shogenji, showed that screening off is a sufficient constraint for the transitivity of probabilistic support. Moreover, this screening off condition can be weakened without sacrificing transitivity, as was demonstrated by Suppes and later by Roche. In this paper we introduce an even weaker sufficient condition for the transitivity of probabilistic support, in fact one that can be made as weak as one wishes. We explain that this condition has an interesting property: it shows that transitivity is retained even though the Simpson paradox reigns. We further show that by adding a certain restriction the condition can be turned into one that is both sufficient and necessary for transitivity.


Synthese ◽  
2021 ◽  
Author(s):  
David Atkinson ◽  
Jeanne Peijnenburg

AbstractEells and Sober proved in 1983 that screening off is a sufficient condition for the transitivity of probabilistic causality, and in 2003 Shogenji noted that the same goes for probabilistic support. We start this paper by conjecturing that Hans Reichenbach may have been aware of this fact. Then we consider the work of Suppes and Roche, who demonstrated in 1986 and 2012 respectively that screening off can be generalized, while still being sufficient for transitivity. We point out an interesting difference between Reichenbach’s screening off and the generalized version, which we illustrate with an example about haemophilia among the descendants of Queen Victoria. Finally, we embark on a further generalization: we develop a still weaker condition, one that can be made as weak as one wishes.


1968 ◽  
Vol 23 (1) ◽  
pp. 25-30 ◽  
Author(s):  
J. Clauwaert ◽  
J. Stockx

The pK' values of the current bases, nucleosides, nucleotides, nucleotide derivatives and poly U have been determined over a large range of ionic strength. The pK' shifts of the monomers due to variations in ionic strength can be accounted for qualitatively and quantitatively by means of the relationThe collision diameters of uracil, uridine, uridine cyclic -2':3'-phosphate and 3' (2') -uridylic acid were determined. The introduction of phosphate affects the charge, resulting into differences in activity coefficient between nucleotides and their corresponding nucleosides and bases. A substitution of -H by ribose at N(3) of uracil or cytosine or at N(9) of adenine or guanine results into an electron withdrawal from the bases with lowering of the pK' value. 2'-Deoxyribose exhibits a weaker electron attraction. Introducing -CH3 at C(5) of uracil yields electrons to the base and the pK values of various thymine derivatives are about 0.5 pH units higher than those of the corresponding uracil derivatives. A phosphate group on C2 or C3 results in an electrostatic attraction of the dissociable proton, so that the pK' is increased at low ionic strengths; at higher ionic strengths screening off occurs and the pK' values of the nucleotides become almost the same as those of the corresponding nucleosides. The site of substitution on the ribose moiety is important: C2'-O-phosphate seems to exert a stronger electrostatic attraction on - NH3⊕ groups than C3'-O-phosphate, whereas C5'-O-phosphate exerts in addition an inductive effect that is dependent on the presence of - OH on C2. The electrostatic influence of the phosphate groups on the uracil moiety in UpU, UpC and CpUpC runs roughly parallel to that found in cyclic-2':3'-nucleotides. The pK' shifts experienced in poly U are related to the polyelectrolyte character of this polymer. A new treatment for the evaluation of the electrostatic potential of polynucleotides (poly U) is proposed that is based on the usual rodlike (polyelectrolyte) model.


Analysis ◽  
1980 ◽  
Vol 40 (3) ◽  
pp. 139-143
Author(s):  
A. D. Kline

1939 ◽  
Vol Original Series, Volume 20 (4) ◽  
pp. 406-414
Author(s):  
O. Sandstrom
Keyword(s):  

Author(s):  
Alex Moran

AbstractRelationalists about episodic memory must endorse a disjunctivist theory of memory-experience according to which cases of genuine memory and cases of total confabulation involve distinct kinds of mental event with different natures. This paper is concerned with a pair of arguments against this view, which are analogues of the ‘causal argument’ and the ‘screening off argument’ that have been pressed in recent literature against relationalist (and hence disjunctivist) theories of perception. The central claim to be advanced is that to deal with these two arguments, memory disjunctivists both can and should draw on resources that are standardly appealed to by rival common factor theories of episodic memory, and, in particular, to the idea that genuine memories and merely apparent ones are to be distinguished, at least in part, in terms of the distinctive ways in which they are caused. On the proposed view, there are substantive causal constraints associated both with cases of genuine memory and with cases of mere confabulation. The resulting theory thus tells us something important about the nature both of genuine memories and of mere confabulations, namely, that such experiences must be caused in certain distinctive ways and cannot occur except as the result of a distinctive sort of causal process. In addition, the theory enables the disjunctivist to offer a unified response to an important pair of arguments against her view.


2011 ◽  
Vol 56 (1) ◽  
pp. 143-150
Author(s):  
Sebastian Egenhofer

Ausgehend von Kants Bestimmung von Kritik als »Grenzziehung« wird die bewusstseinsimmanente Repräsentation des Seienden oder die Welt als Abblendung ihres noumenalen Grundes begriffen. Materiell gebundene Bilder gewinnen für die Explikation der Struktur dieser Immanenz eine besondere Funktion. Als Objekte innerhalb der erscheinenden Welt verdoppeln sie deren Phänomenalität in der Dimension des ikonischen Scheins, der sich der (partiellen) Negation des materiellen Bildträgers verdankt. Aufgrund dieser Spaltung in Phänomenalität und Materialität können Bilder eine Kritik des natürlichen, sei es individuellen oder kollektiven Bewusstseins initiieren. Bildkritik kann so als Scharnier zwischen transzendentaler Bewusstseinskritik und Ideologie- oder Spektakelkritik fungieren.<br><br>Starting from Kant’s conception of critique as »Grenzziehung,« the immanent representation of being, or, the conscious world, is understood as a screening off of its noumenal ground. Materially bound images gain a particular function in the explication of the structure of this immanence. As objects within the phenomenal world they duplicate the world’s phenomenal- ity in the dimension of iconic semblance by (partially) negating their material support. This cleavage between the image’s phenomenality and its materiality makes images into possible catalysts of a critique of natural consciousness, be it individual or collective. Thus, »image critique« can serve as a hinge between a transcendental critique of consciousness and a critique of ideology or spectacle.


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