Masses of constituent quarks confined in open bottom hadrons

We apply color-spin and flavor-spin quark-quark interactions to the meson and baryon constituent quarks, and calculate constituent quark masses, as well as the coupling constants of these interactions. The main goal of this paper was to determine constituent quark masses from light and open bottom hadron masses, using the fitting method we have developed and clustering of hadron groups. We use color-spin Fermi-Breit (FB) and flavor-spin Glozman-Riska (GR) hyperfine interaction (HFI) to determine constituent quark masses (especially $b$ quark mass). Another aim was to discern between the FB and GR HFI because our previous findings had indicated that both interactions were satisfactory. Our improved fitting procedure of constituent quark masses showed that on average color-spin (Fermi-Breit) hyperfine interaction yields better fits. The method also shows the way how the constituent quark masses and the strength of the interaction constants appear in different hadron environments.Comment: 15 pages, 6 tables, 1 figure. Accepted for publication in Mod. Phys. Lett.

Interaction with the Environment: Anthropological Cybernetic Model

Cybernetics is primarily concerned with the transfer of information through, and (re)actions of systems. The research aim was to investigate models of interaction dynamics between an anthropological system and its environment. Equifinality dynamic model defined by three compartments and propensity for establishment of a steady state regardless of the initial conditions was applied. The intention was to apply this concept in anthropological research using the OPSIM procedure. DYNOPS model defined by four age-group compartments and the environment was also used. The model was applied on the census of the Bogomolje village on the island of Hvar (R. Croatia). Through numerous simulations, it was found that the influence of the environment increases with the decrease of time spent in the young age compartment. A drawback of DYNOPS model is that it places the environment in an unchangeable category, while in reality it necessarily changes through numerous interactions with various agents. Finally, cybernetics should not only be used to explicate, but also predict and correct undesired communal developments

The First Spectroscopically Resolved Sub-parsec Orbit of a Supermassive Binary Black Hole

One of the most intriguing scenarios proposed to explain how active galactic nuclei are triggered involves the existence of a supermassive binary black hole system in their cores. Here we present an observational evidence for the first spectroscopically resolved sub-parsec orbit of a such system in the core of Seyfert galaxy NGC 4151. Using a method similar to those typically applied for spectroscopic binary stars we obtained radial velocity curves of the supermassive binary system, from which we calculated orbital elements and made estimates about the masses of components. Our analysis shows that periodic variations in the light and radial velocity curves can be accounted for an eccentric, sub-parsec Keplerian orbit of a 15.9-year period. The flux maximum in the lightcurve correspond to the approaching phase of a secondary component towards the observer. According to the obtained results we speculate that the periodic variations in the observed H{\alpha} line shape and flux are due to shock waves generated by the supersonic motion of the components through the surrounding medium. Given the large observational effort needed to reveal this spectroscopically resolved binary orbital motion we suggest that many such systems may exist in similar objects even if they are hard to find. Detecting more of them will provide us with insight into black hole mass growth process.Comment: 29 pages, 10 figures, published in ApJ, 759, 11

RXJ 0921+4529: a binary quasar or gravitational lens?

We report the new spectroscopic observations of the gravitational lens RXJ 021+4529 with the multi-mode focal reducer SCORPIO of the SAO RAS 6-m telescope. The new spectral observations were compared with the previously observed spectra of components A and B of RXJ 0921+4529, i.e. the same components observed in different epochs. We found a significant difference in the spectrum between the components that cannot be explained with microlensing and/or spectral variation. We conclude that RXJ 0921+4529 is a binary quasar system, where redshifts of quasars A and B are 1.6535 +/- 0.0005 and 1.6625 +/- 0.0015, respectively.Comment: 6 pages, 5 figures, accepted for publication in The Astrophysical Journal Letter

Polymers Based on Renewable Raw Materials – Part II

A short review of biopolymers based on starch (starch derivatives, thermoplastic starch), lignin and hemicelluloses, chitin (chitosan) and products obtained by degradation of starch and other polysaccharides and sugars (poly(lactic acid), poly(hydroxyalkanoates)), as well as some of their basic properties and application area, are given in this part. The problem of environmental and economic feasibility of biopolymers based on renewable raw materials and their competitiveness with polymers based on fossil raw materials is discussed. Also pointed out are the problems that appear due to the increasing use of agricultural land for the production of raw materials for the chemical industry and energy, instead for the production of food for humans and animals. The optimistic assessments of experts considering the development perspectives of biopolymers based on renewable raw materials in the next ten years have also been pointed out.At the end of the paper, the success of a team of researchers gathered around the experts from the company Bayer is indicated. They were the first in the world to develop a catalyst by which they managed to effectively activate CO - and incorporate it into polyols, used for the synthesis of polyurethanes in semi-industrial scale. By applying this process, for the first time a pollutant will be used as a basic raw material for the synthesis of organic compounds, which will have significant consequences on the development of the chemical industry, and therefore the production of polymers

Nucleotide sequence analysis of the inversion termini located within IS3 elements α3β3 and β5α5 of Escherichia coli K-12

This paper presents the first detailed structural analysis of termini of an inversion mediated by recombination between Escherichia coli native IS elements. The complete nucleotide sequence of the inversion termini in the lactose region of Escherichia coli K-12 confirms our previous suggestion that the inversion occurred by homologous recombination between α3β3 and β5α5 IS3 elements (D.J. Savic, J. Bacteriol. 140:311-319, 1979; D.J. Savic, S. Romac, and S.D. Ehrlich, J. Bacteriol. 155:943-946, 1983). The data show a slight structural divergence of α3β3 and β5α5 elements, but they do not reveal new sequences within recomhined IS3 elements that could influence the expression of nearby genes

The influence of air pollution on the content of 3.4-benzpyrene in nonrefined oil obtained from sunflower seeds grown in differently polluted areas

Postavljena je pretpostavka da je zagađenost zraka jedan od bitnih elemenata koji uslovljuju kontaminaciju biljnih ulja. Određivan je sadržaj 3,4-benzpirena u sirovom suncokretovom ulju, ekstrahiranom iz sjemena suncokreta, uzgajanog na različito kontaminiranim područjima, kao i u uzorcima zemlje, uzetih sa zasijanih površina. Isključeni su moguće utjecaji u periodu sazrijevanja sjemena (žetva, transport, skladištenje) pa do finalne industrijske prerade. Uzorci sjemena su ručno sabrani i laboratorijskom tehnikom priređeni uzorci ulja. Nađene količine 3,4-benzpirena u ulju, u količinama od 0,4-40,5 µg/kg ulja, pokazuju direktnu ovisnost o intenzitetu zagađivanja zraka. Relativno visoki sadržaj 3,4-benzpirena u uzorcima zemlje (29,3-900,0 µg/kg zemlje) ukazuju na veliku rezistentnost i mogućnost akumulacije ove karcinogene supstance.It is supposed that air pollution is one of crucial factors in contamination of vegetable oils. The content of 3,4-benzpyrene was determined in nonrefined oil, obtained from sunflower seeds which were grown in areas with varying degree of pollution, and in the samples of soil taken from the same areas. Possible influences during the ripening of the seed (harvest, transport, storage) until the final industrial processing were excluded. Seed samples were hand collected and oil samples prepared under laboratory conditions. The amount of 3,4-benzpyrene in oil ranges from 0.4-40,5 µg/kg oil and shows direct relationship with the intensity of air pollution. A relatively high content of 3,4-benzpyrene in soil samples (29.3-900.0 µg/kg soil) points at a high resistance and possibility of accumulation of this carcinogenic substance

Mould and mycotoxin contamination of pig and poultry feed

During ten-year period (1995-2004), a total of 756 analyses of pig and poultry feed was performed. Standard methods were used for microbiological determination. Qualitative and quantitative analyze of mycotoxins was performed by TLC technique. Feed for young categories contained from 100 to 3,400,000 CFU/g of feed. In 35.71% of all samples the detected amount was above acceptable levels. Feed for adult categories contained from 800 to 8,000,000 CFU/g of feed. In only 7.54% of samples this amount was over the tolerable level. Species determination revealed great heterogeneity, with the most common findings of Penicillium spp. (28.38%), Aspregillus spp. (26.37%) Mucor spp. (24.67%), Fusarium spp. (11.33%) and Rhizopus spp. (9.22%). The amount and type of mycotoxin varied depending on the feed category as well as on year of detection, implicating a strong influence of climatic factors and average humidity of the specified year. In a total of 320 analyzed feeds for pigs and poultry the characteristic finding was a combined contamination with two or three mycotoxins. In 161 samples of feed for young animals the presence of AFB1, F-2 and OTA was detected in 36, 161 and 161 samples respectively, while in 33, 83 and 71 samples the detected amounts were above tolerable levels. In 159 samples of feed for adult animals the presence of AFB1, F-2 and OTA was detected in 32, 159 and 159 samples, respectively while in 31, 65 and 99 samples the detected amounts were above tolerable levels

Razvoj i ocjena modela za predikciju temperature površine kolničke konstrukcije

This paper examines the existing models for predicting pavement temperatures and formulates a new one using a regression equation to predict the minimum and maximum pavement surface temperatures depending on the air temperature. Also, the paper presents a model for pavement temperature prediction according to the Superpave methodology and conducts the validation of the model for measured temperatures.U članku su predstavljeni postojeći modeli za predikciju temperature kolnika i formuliran je novi model pomoću regresione jednadžbe kojom se predviđaju minimalne i maksimalne temperature površine kolnika u ovisnosti od temperature zraka. Također je predstavljen i model za predikciju temperature prema Superpave metodologiji i izvedeno je vrednovanje modela za izmjerene temperature

Three natural mechanical systems on Stiefel varieties

We consider integrable generalizations of the spherical pendulum system to the Stiefel variety $V(n,r)=SO(n)/SO(n-r)$ for a certain metric. For the case of V(n,2) an alternative integrable model of the pendulum is presented. We also describe a system on the Stiefel variety with a four-degree potential. The latter has invariant relations on $T^*V(n,r)$ which provide the complete integrability of the flow reduced on the oriented Grassmannian variety $G^+(n,r)=SO(n)/SO(r)\times SO(n-r)$.Comment: 14 page