Party Alignment on Gun Laws: Urban v.s. Rural

Mass shootings in the United States have led to debate about gun rights and increased division over the second amendment. Have parties’ positions on gun laws affected voter alignment? This study seeks to determine the effects of restrictive gun laws over time on party alignment within the United States. The urban rural divide in the United States has played a distinctive role in voter alignment on issues like restrictive gun laws. To evaluate this claim, this study uses the Pew Research Center and other opinion polls from the last twenty years to determine whether restrictive gun laws produce higher levels of partisanship amongst voters on rural areas versus voters in urban areas. Additionally, this research serves to evaluate whether levels of partisanship have seen shifts in how people identify with their party on restrictive gun laws

Radial drift in warped protoplanetary disks

The meter-size barrier in protoplanetary disks is a major challenge in planet formation, for which many solutions were suggested. One of the leading solutions is dust traps, that halt or slow the inward migration of dust particles. The source and profile of these traps are still not completely known. Warped disks are ubiquitous among accretion disks in general and protoplanetary disks in particular, and the warping could lead naturally to the formation of dust traps. Dust traps in warped disks could rise not only from pressure gradients, but also due to different precession rates between gas and dust. Here we derive analytically the radial drift in warped disks, and demonstrate derivation for some specific conditions. The radial drift in warped protoplanetary disks is qualitatively different, and depending on the structure of the disk, dust traps could form due to the warping. Similar processes could lead to the formation of traps also in other accretion disks such as AGN disks

Asymptotic degree distribution in preferential attachment graph models with multiple type edges

We deal with a general preferential attachment graph model with multiple type edges. The types are chosen randomly, in a way that depends on the evolution of the graph. In the N-type case, we define the (generalized) degree of a given vertex as where is the number of type k edges connected to it. We prove the existence of an a.s. asymptotic degree distribution for a general family of preferential attachment random graph models with multi-type edges. More precisely, we show that the proportion of vertices with (generalized) degree d tends to some random variable as the number of steps goes to infinity. We also provide recurrence equations for the asymptotic degree distribution. Finally, we generalize the scale-free property of random graphs to the multi-type case

Data to the leaf-beetle fauna of Greece (Coleoptera: Chrysomelidae)

During the period 1981 to 2004 the researchers of the Hungarian Entomological Society organised 9 collecting trips to West- and Central Greece, to the Pelopponisos and some other Greek islands (Crete, Corfu, Rhodes, Thíra). This article contains the data related to the leaf beetles of 11 subfamilies, 40 genera and 114 species collected on these trips. Psylliodes toelgi Heiertinger, 1914 was proven to be a new record to Greece