Több mint tíz év telt el a Naszály lepkéit tárgyaló első közlemény megjelenése óta. Ismert tény, hogy faunisztikai kutatást sohasem lehet lezártnak tekinteni, mert időről időre újabb fajok jelennek meg vizsgált területen. A területről ebben az elmúlt időszakban 51 új moly- és 75 nagylepkefaj került elő, összesítve 1473 lepkefaj vált ismeretessé (727, ill. 746 faj). fajszám tekintetében munka ha...

La actividad laboral del ser humano ha permitido transformar el mundo pero, al mismo tiempo, ha generado riesgos y enfermedades que han sido reconocidas desde muy antiguo. Galeno describió las intoxicaciones de los mineros de Chipre; durante el renacimiento, Georg Agricola (1494-1555) realizó una primera división entre enfermedades laborales crónicas y agudas; Paracelso, a mediados del siglo XV...

A satissability problem can be regarded as a nondisjoint union of set covering problems. We show that if the resolution method of theorem proving is applied to the satissability problem, its constraint set deenes an integral polytope if and only if the constraint sets of the set covering problems do. In this sense, resolution reduces the integrality question for the satissability problem to tha...

In this paper we propose a new multivariate GARCH model with timevarying correlations. We adopt the vech representation based on the conditional variances and the conditional correlations. While each conditional-variance term is assumed to follow a univariate GARCH formulation, the conditional-correlation matrix is postulated to follow an autoregressive moving average type of analogue. By impos...

Objectives—To evaluate the impact of the United States Tobacco Price Support Program (TPSP) on domestic cigarette consumption and the potential political impact of the TPSP on eVorts to reduce smoking. Data sources—Published studies known to the authors and a search of AGRICOLA from 1980 to 1996. Study selection—Studies published in a refereed journal or research reports published by an accredi...

We used a survey of attendees of an organic farming conference in Minnesota, U.S.A., to determine whether farmers would be more likely to adopt a fall-seeded winter rye cover crop preceding soybeans if doing so could aid in the suppression of soybean aphid, Aphis glycines Matsumura (Homoptera: Aphididae). Of the 24 soybean growers that responded to our survey, 22 indicated that they would be mo...