On February 28, 2021, a fireball dropped ?0.6 kg of recovered CM2 carbonaceous chondrite meteorites in South-West England near the town Winchcombe. We reconstruct fireball's atmospheric trajectory, light curve, fragmentation behavior, and pre-atmospheric orbit from optical records contributed by five networks. The progenitor meteoroid was three orders magnitude less massive (?13 kg) than any pr...

For millennia, human beings have believed that it is morally wrong to judge others by the fortuitous or unfortunate events that befall them or by the actions of another person. Rather, an individual's own intended, deliberate actions should be the basis of his or her evaluation, reward, and punishment. In a series of studies, the authors investigated whether such rules guide the judgments of ch...

1998, vol. 53, n° 2 0034-379X In this paper, I adopt a critical sociological approach to analyse how labour law shaped a 23-day strike at a western Canadian university in the fall of 1995. I begin with a brief discussion of the sociological alternative. Next, I provide a chronology of the strike, followed by a brief analysis of how both economic and sociological models contribute to understandi...

Research suggests that season of birth is associated with several psychiatric and neurological disorders, and also with adult monoamine neurotransmitter turnover. Personality traits are modulated in part by neurotransmitters; and population studies show season of birth variations in adult personality traits such as novelty seeking. Also, neurotransmitters are involved in suicidal behavior; and ...

We present an empirical analysis of the effectiveness of frame selection (also known as Lucky Imaging) techniques for high resolution imaging. A high-speed image recording system has been used to observe a number of bright stars. The observations were made over a wide range of values of D/r0 and exposure time. The improvement in Strehl ratio of the stellar images due to aligning frames and sele...

Suppose the vertices of a graph G are labeled with real numbers. For each vertex v ∈ G, let S(v) denote the sum of the labels of all vertices adjacent to v. A labeling is called lucky if S(u) 6= S(v) for every pair u and v of adjacent vertices in G. The least integer k for which a graph G has a lucky labeling from {1, 2, . . . , k} is called the lucky number of the graph, denoted η(G). In 2009,...

In this note, we define the concepts of admissible relation and admissible partition for an arbitrary BL-general fuzzy automaton.In particular, a connection between the admissible partition and the quotient BL-general fuzzy automaton is presented.It is shown that if we use the maximal admissible partition, then we obtain a quotient BL-general fuzzy automaton and this quotient is minimal. Finall...