The colour of the narrow line Sy1-blazar 0324+3410

Aims. We investigate the properties of the host galaxy of the blazar J0324+3410 (B2 0321+33) by the analysis of B and R images obtained with the NOT under good photometric conditions. Methods: The galaxy was studied using different methods: Sersic model fitting, unsharp-masked images, B-R image and B-R profile analysis. Results: The images show that the host galaxy has a ring-like morphology. The B-R colour image reveals two bluish zones: one that coincides with the nuclear region, interpreted as the signature of emission related to the active nucleus, the other zone is extended and is located in the host ring-structure. We discuss the hypothesis that the later is thermal emission from a burst of star formation triggered by an interacting/merging process

Pauli-Limited Superconductivity with Classical Magnetic Fluctuations

We examine the effect of classical magnetic fluctuations on the phase diagram of paramagneticallylimited two-dimensional superconductors under a Zeeman magnetic field. We derive the free energy expansion in powers of the superconducting order parameter and analyze the character of the normalsuperconducting transition. While the transition is of the second order for all temperatures in the absence of magnetic fluctuations, we find that proximity to magnetism drives both the transition into the uniform state and that into the modulated (Fulde-Ferrell-Larkin-Ovchinnikov, FFLO) state to first order at intermediate temperatures. We compute the thermodynamic signatures of the normal-superconducting transition along the upper critical field.Comment: 16 pages, 9 figure

Liva 1 – The First Medieval Sámi Site with Rectangular Hearths in Murmansk Oblast (Russia)

In 2017–2018, the Kola Archaeological Expedition of the Institute of the History of Material Culture (IHMC) RAS carried out excavations at the medieval site of Liva 1 (a hearth-row site)in the Kovdor District of Murmansk Oblast. Sites of this type are fairly well studied in the western part of Sapmi – the area inhabited by the Sámi – but until now they have not beenknown in Russia. The site was found by local residents in 2010. Some of the structures there were destroyed or damaged when searching for artefacts with a metal detector. A total ofnine archaeological structures have been discovered (7 rectangular stone hearths, 1 mound, 1 large pit). Four hearths were excavated. They are of rectangular shape, varying in size from 2.0 x 1.15 to 2.5 x 1.7 metres. The fireplaces are lined with large stone blocks in one course, and the central part is filled with small stones in 2–3 layers. Animal bones, occasionallyforming concentrations, were found near the hearths. Throughout the area of the settlement, numerous iron objects (tools or their fragments) and bronzes were collected includingornaments made in manufacturing centres of Old Rus’, Scandinavia and the Baltic countries. The settlement is dated with radiocarbon analysis and the typology of the ornaments to the11th – 14th centuries

On the Privacy Practices of Just Plain Sites

In addition to visiting high profile sites such as Facebook and Google, web users often visit more modest sites, such as those operated by bloggers, or by local organizations such as schools. Such sites, which we call "Just Plain Sites" (JPSs) are likely to inadvertently represent greater privacy risks than high profile sites by virtue of being unable to afford privacy expertise. To assess the prevalence of the privacy risks to which JPSs may inadvertently be exposing their visitors, we analyzed a number of easily observed privacy practices of such sites. We found that many JPSs collect a great deal of information from their visitors, share a great deal of information about their visitors with third parties, permit a great deal of tracking of their visitors, and use deprecated or unsafe security practices. Our goal in this work is not to scold JPS operators, but to raise awareness of these facts among both JPS operators and visitors, possibly encouraging the operators of such sites to take greater care in their implementations, and visitors to take greater care in how, when, and what they share.Comment: 10 pages, 7 figures, 6 tables, 5 authors, and a partridge in a pear tre

Homotopy Relations for Topological VOA

We consider a parameter-dependent version of the homotopy associative part of the Lian-Zuckerman homotopy algebra and provide the interpretation of multilinear operations of this algebra in terms of integrals over certain polytopes. We explicitly prove the pentagon relation up to homotopy and propose a construction of higher operations.Comment: 15 pages, 1 figure, typos correcte

Imaginary chemical potential and finite fermion density on the lattice

Standard lattice fermion algorithms run into the well-known sign problem at real chemical potential. In this paper we investigate the possibility of using imaginary chemical potential, and argue that it has advantages over other methods, particularly for probing the physics at finite temperature as well as density. As a feasibility study, we present numerical results for the partition function of the two-dimensional Hubbard model with imaginary chemical potential. We also note that systems with a net imbalance of isospin may be simulated using a real chemical potential that couples to I_3 without suffering from the sign problem.Comment: 9 pages, LaTe

Conflictivitat i ruptura en el matrimoni

Es tracta de la intensa i generalitzada crisi del matrimoni, de profunda i àmplia repercussió social, basant-se en documentats estudis i fidedignes estadístiques. Es desenvolupa una tipologia de les situacions d’exclusió, tensió, conflictivitat i ruptura que es donen en relació amb el matrimoni. Sintetitzada, és la següent: a) unions sense lligam jurídic; b) conflictivitat en el si del matrimoni:, c,) doblatge entre la vida conjugal i unes relacions sexuals extramatrimonials; d) separacions merament de fet o a través d’un conveni; e) separació judicial o administrativa, mantenint-se el vincle; f ) nova convivència fixa amb tercera persona; g) assoliment d’una sentència de divorci vincular; h) obtenció d’una resolució judicial que declari nul el matrimoni o d’una dispensa que el deixi sense efecte. S’inclou el resultat d’una anàlisi sociològica efectuada sobre una mostra de les causes de separació conjugal introduïdes al Tribunal Eclesiàstic de Barcelona en el període 1968-1974. Es destaca la importància, a part de consideracions jurídiques, de l’existencia d’un veritable amor psíquic i sexual, d’una compenetració intel·lectual i afectiva, que faci veritablement estable la unió matrimonial i que permeti de superar les influències derivades, en bona part, de la massificació, del materialisme egoista i del consumisme, existents en la societat capitalista i que porten a la tensió, a la conflictivitat i a la ruptura matrimonial

Report on the radiometric analysis of the Ghar Dalam fossil specimens prepared for the Ghar Dalam Museum

Uranium is a radioactive element emitting mainly alpha rays, but its daughter elements Th and Ra are gamma ray emitters. A high resolution gamma ray spectrometry system can be used to determine gamma-emitting radionuclides with energies ranging from 1 keV to 10 MeV depending on the type of detector in a large variety of sample matrices. The simultaneous detection of several gamma radionuclide emitters in the sample material was carried out with a coaxial germanium detector of high resolution connected to a multichannel analyser. Automatic processing of the collected spectral data was controlled by a computer system with selected software. Sources of error in the technique may be caused by improper spectral identities, changes in background, errors in calibration and/or geometry, and lack of homogeneity in samples. Since the samples tested were not in a standardised geometry, some variation in the readings could be expected due to the difference in sample homogeneity. The results obtained for the various samples were standardised as a ratio of 40K, on the assumption that the high solubility of potassium salts would result in a steady equilibrium in all samples. Several fossil specimens kept in the Ghar Dalam Museum were borrowed by courtesy of Dr. G. Zammit Maempel. The specimens had unfortunately no information as to the level they were excavated from, and their providence could not be reliably confirmed.peer-reviewe