Alternative equation of motion approach to the single-impurity Anderson model

Solving the single-impurity Anderson model (SIAM) is a basic problem of solid state physics. The SIAM model is very important, at present it is also used for systems with quantum impurities, e.g. semiconductor quantum dots and molecular transistors. Its main application is in the scheme of dynamical mean field theory (DMFT) describing strong correlation electron systems. To solve the SIAM problem we use the equation of motion (EOM) Green function approach. In this report we present the novel EOM approximation in which we differentiate the Green function over both time variables. This differs from the commonly used EOM solution by Appelbaum, Penn and Lacroix where the authors take time derivative only over primary time variable. After extending calculations to higher order Green functions we find the new approximate dynamical solution of SIAM. The results are compared with the solutions to the SIAM problem at intermediate Coulomb repulsion U such as the Modified Iterative Perturbation Theory. Our approach is suitable for describing quantum dots.Comment: 6 pages, 3 figure

Analiza prevalencije izabranih odstupanja kvalitete peradi za klanje u Poljskoj u razdoblju 2016. - 2019.

The aim of the study was to analyse the results of official post-mortem inspections of hens, chickens, turkeys, ducks and geese carried out in poultry slaughterhouses in Poland by the Veterinary Inspection in 2016–2019. The data from the sanitary and veterinary survey were taken from annual reports drawn up by the General Veterinary Inspectorate (RRW-6) in 2016–2019. During this period, nearly 900 million hens, 206 million turkeys, 122 million ducks, 63 million geese, and over 5.7 billion slaughter chickens were slaughtered under veterinary supervision. Symptoms or lesions were found in almost 2.6 million hens (0.29%), 1.8 million turkeys (0.86%), 792 thousand ducks (0.65%), 185 thousand geese (0.29%) and over 27.3 million chickens (0.48%). The main causes of confiscation were emaciation (0.14%), incomplete loss of blood (0.06%), and septicaemia and pyaemia (0.07%). Quality deviations in the form of emaciation or incomplete loss of blood of slaughtered animals indicate shortcomings during rearing or transport of animals for slaughter. Therefore, there may be legitimate concerns about the appropriate level of animal welfare. The size of overall losses in poultry is determined by the disqualification of chickens, due to slaughter size in comparison with other species. The confiscation of such a large number of chickens deserves greater attention to determine the causes involved.Cilj je ove studije bio analizirati rezultate službene obdukcijske inspekcije kokošiju, pilića, purica, pataka i gusaka koje je u razdoblju 2016.-2019. godine obavila veterinarska inspekcija u klaonicama peradi u Poljskoj. Analizirani su podatci sanitarnog i veterinarskog nadzora uzeti iz godišnjih izvješća koje je sastavio Glavni veterinarski inspektorat (RRW-6) u razdoblju 2016.-2019. godine. Između 2016. i 2019. godine, gotovo 900 milijuna kokošiju, više od 5,7 milijardi pilića za klanje, više od 206 milijuna purica, više od 122 milijuna pataka i više od 63 milijuna gusaka zaklano je pod veterinarskim nadzorom. Simptomi ili lezije pronađeni su u gotovo 2,6 milijuna kokošiju (0,29 %), više od 27,3 milijuna pilića (0,48 %), gotovo 1,8 milijuna purica (0,86 %), gotovo 729 tisuća pataka (0,65 %) te gotovo 185 tisuća gusaka (0,29 %). Glavni uzroci konfiskacije bili su propadanje (0,14 %), nepotpun gubitak krvi (0,06 %), kao i septikemija i pijemija (0,07 %). Odstupanja kvalitete u obliku propadanja ili nepotpunog gubitka krvi zaklanih životinja ukazuju na grješke tijekom uzgoja ili prijevoza životinja za klanje pa stoga može postojati opravdana zabrinutost u svezi prikladne razine dobrobiti životinja. Količina sveukupnih gubitaka u peradarstvu određuje se diskvalifikacijom pilića, zbog količine klanja u usporedbi s ostalim vrstama. Konfiskacija takvog velikog broja pilića zaslužuje više pozornosti, kao i pronalaženja razloga za to

Evidence for non-Gaussianity in the COBE DMR Four Year Sky Maps

We introduce and study the distribution of an estimator for the normalized bispectrum of the Cosmic Microwave Background (CMB) anisotropy. We use it to construct a goodness of fit statistic to test the coadded 53 and 90 GHz COBE-DMR 4 year maps for non-Gaussianity. Our results indicate that Gaussianity is ruled out at the confidence level in excess of 98%. This value is a lower bound, given all the investigated systematics. The dominant non-Gaussian contribution is found near the multipole of order $\ell=16$. Our attempts to explain this effect as caused by the diffuse foreground emission from the Galaxy have failed. We conclude that unless there exists a microwave foreground emission which spatially correlates neither with the DIRBE nor Haslam maps, the cosmological CMB anisotropy is genuinely non-Gaussian.Comment: 16 pages, 3 figs uses aasms4.tex, revised and accepted to Ap. J. Let

On the issue of determination of the threshold ratios of narcotic drugs as features of traffic offenses and misdemeanors

The issue presented in this article is the problem of specificity of the features which constitute the prohibited acts whose definitions contain the term condition under the influence and the term condition after consumption. One must take note of the fact that the lack of definition of clear quantitative limits of narcotic drugs in the content of the penalizing regulation does not make it unconstitutional. Although prima facie this situation may raise doubts related to the procedural safeguards, there is a number of important reasons for not providing specific ratios. However, it must be emphasized that both the doctrine and the jurisprudence point at the lack of possibility, or significant difficulty, to create an exhaustive list of narcotic drugs and their precise threshold ratios on which the criminality of individual behavior would depend.This article aims at providing general information on the subject to the broader public, and explaining reasons behind the status quo, rather than at solving the arising legal problems. The commitment embodies the intention to launch an irregular series of papers under a general (sub) title

Magnetic ordering of itinerant systems in modified mean field theory: antiferromagnetism

We analyze the itinerant model for antiferromagnetism, which was developed previously by Plischke, Mattis, Brouers and Mizia. In this model we include both; single-site and two-site electron correlations. Including additionally band degeneration into the model allows for considering intra-atomic exchange interactions in the Hamiltonian. The modified Hartree-Fock approximation for the two-site interactions is used. This approximation gives the spin band narrowing, which is the same for both spin directions and affects possibility of antiferromagnetic ordering. We use the Green function technique and CPA decoupling. This allows for the change in shape of the spin bands, described by the correlation factors, which decreases kinetic energy of the system. The effective Hartree field and the gain in kinetic energy due to the on-site and inter-site correlation factors drive the antiferromagnetism.Comment: 8 pages, 1 figur

Groźba bezprawna jako znamię przestępstwa z art. 245 k.k. : rozważania na tle orzecznictwa Sądu Najwyższego i sądów apelacyjnych

This article aims to interpret the term “unlawful threat” under Article 245 of the Criminal Code. It can be observed that judicial decisions of the Supreme Court and legal doctrine do not provide a uniform interpretation of the term. The work discusses whether the result in the shape of a justified concern that the threat will be carried out is necessary. Such a criminal result is described in Article 190 of the Criminal Code which penalizes punishable threats. It corresponds with Article 115 § 12 of the Criminal Code which defines an unlawful threat. In the opinion of the authors, causing a justified fear that the threat will be carried out is one of the statutory features in all three cases, i.e. unlawful threats to commit a criminal offence, to institute criminal proceedings and to disseminate defamatory information.Celem niniejszego artykułu jest dokonanie wykładni znamienia groźby bezprawnej występującego na gruncie art. 245 k.k. We wskazanym zakresie brak jest jednolitości w orzecznictwie Sądu Najwyższego, sądów apelacyjnych oraz w doktrynie. Zasadniczy problem wiąże się z kwestią zawierania się w pojęciu groźby bezprawnej skutku w postaci wzbudzenia uzasadnionej obawy spełnienia groźby. Skutek ten został określony w art. 190 k.k. opisującym przestępstwo tzw. groźby karalnej, do którego odsyła definicja ustawowa groźby bezprawnej określona w art. 115 § 12 k.k. W ocenie autorów skutek polegający na powstaniu uzasadnionej obawy spełnienia groźby należy do elementów groźby bezprawnej we wszystkich trzech przypadkach, tj. w przypadku groźby popełnienia przestępstwa, spowodowania postępowania karnego lub rozgłoszenia infamującej wiadomości