313 research outputs found
The new p-process database of KADoNiS
The KADoNiS (Karlsruhe Astrophysical Database of Nucleosynthesis in Stars) project is an online
database (www.kadonis.org) for cross sections relevant to the s-process and the p-process.
The first version was an updated sequel to the previous Bao et al. [1] compilations from 1987
and 2000 for (n; g) cross sections relevant to Big Bang and s-process nucleosynthesis. The first
update, KADoNiS v0.2, was published in 2006 [2]. It contained mainly Maxwellian averaged
(n; g) cross sections relevant to the s-process, and some experimental charged particle induced
reaction relevant to the p-process. After that a second update was presented in 2009 [3].
Recently, we started to collect and review all existing experimental data relevant for p-process
nucleosynthesis and to provide a user-friendly database based on the KADoNiS framework. The
p-process part of the KADoNiS database is currently being extended and will include all available
experimental data from (p; g), (p;n), (p;a), (a,g), (a;n) and (a; p) reactions in or close to the
respective Gamow window
Hierarchies of tree series transformations
AbstractWe study bottom-up and top-down tree series transducers over a semiring A and denote the tree series transformation classes computed by them by BOTtâts(A) and TOPtâts(A), respectively. We present the inclusion diagram of the classes p-BOTtâtsn(A), p-TOPtâtsn(A), p-BOTtâtsn+1(A), and p-TOPtâtsn+1(A) and prove its correctness, where A is a commutative izz-semiring (izz=idempotent, zero-divisor free, and zero-sum free) and the prefix p stands for polynomial. This inclusion diagram implies the properness of the following four hierarchies: p-TOPtâts(A)âp-TOPtâts2(A)âp-TOPtâts3(A)ââŻ,p-BOTtâts(A)âp-BOTtâts2(A)âp-BOTtâts3(A)ââŻ,p-TOPtâts(A)âp-BOTtâts2(A)âp-TOPtâts3(A)âp-BOTtâts4(A)ââŻ,p-BOTtâts(A)âp-TOPtâts2(A)âp-BOTtâts3(A)âp-TOPtâts4(A)ââŻ,where the first hierarchy generalizes the famous top-down tree transformation hierarchy of Engelfriet (Math. Systems Theory 15 (1982) 95â125). As the second main result we prove that the first two hierarchies are proper even for arbitrary (i.e., not necessarily commutative) izz-semirings
Ritka nemesgĂĄz izotĂłpokon lejĂĄtszĂłdĂł nukleĂĄris asztrofizikai reakciĂłk vizsgĂĄlata = Study of nuclear reactions on rare noble gas isotopes relevant to nuclear astrophysics
A 3He(alfa,gamma)7Be szigma(E) hatĂĄskeresztmetszetĂ©re a modellek min. 3,5% pontossĂĄgot igĂ©nyelnek. A mĂ©rĂ©si eredmĂ©nyek erĆsen szĂłrnak, ezĂ©rt a reakciĂłsebessĂ©get [szigma(E)] 3 fĂŒggetlen mĂłdszerrel (aktivĂĄciĂł, g-hozam Ă©s "recoil" szeparĂĄtor) mĂ©rtĂŒk meg. A 3 eredmĂ©ny ĂĄtlagĂ©rtĂ©ke jobb a korĂĄbbiaknĂĄl, de pontossĂĄga mĂ©g nem elegendĆ, tovĂĄbbi mĂ©rĂ©sekre van szĂŒksĂ©g. A CNO-ciklus mĂĄs reakciĂłira [14,15N(p,g)15,16O] is Ășj, meghatĂĄrozĂł szigma(E) Ă©rtĂ©keket adtunk meg (LUNA). A p-folyamat vizsgĂĄlatok sorĂĄn szĂĄmos Ășj reakciĂłsebessĂ©get mĂ©rtĂŒnk Ă©s összehasonlĂtottuk Hauser-Feshbach szĂĄmolĂĄsokkal. EredmĂ©ny: proton keltette reakciĂłkra az egyezĂ©s megfelelĆ, mĂg alfa-rĂ©szecskĂ©kre nem. Pontos rugalmas alfa- szĂłrĂĄsainkbĂłl kapott optikai potenciĂĄlokkal szĂĄmolva sincs egyezĂ©s. A p-folyamat tanulmĂĄnyozĂĄsĂĄra egy Ășj irĂĄnyt, a (p,n) reakciĂłk alkalmazĂĄsĂĄt vezettĂŒk be. Az egyik kulcsreakciĂł [124Xe(alfa,gamma)128Ba] mĂ©rĂ©sĂ©hez a kamra elkĂ©szĂŒlt, tesztelĂ©se folyik. MĂ©rĂ©seinkhez fĆleg aktivĂĄciĂłs mĂłdszert hasznĂĄltunk, ezĂ©rt mĂ©rtĂŒk kĂŒlönbözĆ anyagokba implantĂĄlt aktĂv magok felezĂ©si idejĂ©nek elmĂ©letileg jĂłsolt vĂĄltozĂĄsĂĄt. Sem anyag, sem hĆmĂ©rsĂ©klet fĂŒggĂ©st nem talĂĄltunk. Nemzetközi egyĂŒttmƱködĂ©sben (OTKA IN64269) mĂ©rĂ©seket vĂ©geztĂŒnk az indirekt Trojan Horse MĂłdszerrel. BizonyĂtottuk a mĂłdszer asztrofizikai alkalmazhatĂłsĂĄgĂĄt [7Li(p,alfa)4He], elsĆkĂ©nt mĂ©rtĂŒnk interferencia-mentes p-p szĂłrĂĄst, valamint az 18O(p,alfa)15N Ă©s a 10,11B+p reakciĂłkat az un. Gamow-ablakban (közel nulla energiĂĄnĂĄl). | The 3He(alpha,gamma)7Be is a key reaction (Big-Bang; Hydrogen Burning), the sigma(E) cross section should be known with a precision of 3.5%. Because of discrepancies between different results, we measured it with 3 independent methods (activation, g-yield, recoil separator). The results are consistent, the average rate improved, however, the precision is still not enough. New sigma(E) values were also determined for reactions important for CNO-cycle. Astrophysical p-process: a lot of new reaction rates were measured. The results were compared with Hauser-Feshbach calculations using different particle-nucleus potentials. Conclusion: for proton induced reactions the agreement is acceptable, contrary to alpha-particles. Optical potentials extracted from precise alpha-elastic scattering didn't solved the problem for alpha-s. A new idea, the applicability of (p,n) reactions in p-process studies was introduced. The key reaction, 124Xe(alpha,gamma)128Ba, is in test phase, the setup was developed. In our studies activation method was mostly used, therefore the predicted halflife changes of active nuclei implanted into different materials were checked. Neither host material nor temperature dependence was found. Experiments were performed by Trojan Horse Method in international collaboration (OTKA IN64269). The applicability of that indirect method was proved (7Li+p), first time the interference-free p-p scattering as well as the 18O+p and 10,11B+p reactions at close to zero energies (no extrapolation) were measured
Origin of the p-process radionuclides âčÂČNb and ÂčâŽâ¶Sm in the early solar system and inferences on the birth of the Sun
The abundances of âčÂČNb and ÂčâŽâ¶Sm in the early solar system are determined from meteoritic analysis, and their stellar production is attributed to the p process. We investigate if their origin from thermonuclear supernovae deriving from the explosion of white dwarfs with mass above the Chandrasekhar limit is in agreement with the abundance of â”ÂłMn, another radionuclide present in the early solar system and produced in the same events. A consistent solution for âčÂČNb and â”ÂłMn cannot be found within the current uncertainties and requires the âčÂČNb/âčÂČMo ratio in the early solar system to be at least 50% lower than the current nominal value, which is outside its present error bars. A different solution is to invoke another production site for âčÂČNb, which we find in the α-rich freezeout during core-collapse supernovae from massive stars. Whichever scenario we consider, we find that a relatively long time interval of at least âŒ10 My must have elapsed from when the star-forming region where the Sun was born was isolated from the interstellar medium and the birth of the Sun. This is in agreement with results obtained from radionuclides heavier than iron produced by neutron captures and lends further support to the idea that the Sun was born in a massive star-forming region together with many thousands of stellar siblings
Collecting duct carcinoma appearing as a hepatic hydatid cyst. A rare case report
George Emil Palade University of Medicine, Pharmacy, Science and Technology of Targu
Mures, The 8th International Medical Congress for Students and Young Doctors, September 24-26, 2020Background. Collecting duct carcinoma is located in the renal medulla and it originates from
the collecting duct epithelium. It involves about 1% from all renal epithelial malignancies. Male patients are more exposed and the tumor localization shows a right sided predominance.
It is characterized by aggressiveness and poor prognosis.
Case report. We present a case of a middle age male patient who complained of right
hypochondriac pain. The physical examination evidenced a large abdominal tumor formation
in the right hypochondria and ultrasonography highlighted a mass, localized in the 8th segment
of the right liver lobe. The primary diagnosis defined a hepatic hydatid cyst. A subsequent CT
scan revealed a cystic structure of the right kidney, which presented Bosniak III type and
measured 126x121x146 mm. Surgical treatment was initiated and intraoperatively a right
kidney tumor was detected, due to which right nephrectomy was performed. The
histopathological examination and the immunohistochemical profile established the final
diagnosis of collecting duct carcinoma, with the tumor stage of pT3Nx. Regarding the patient's
evolution, he was mobilized on the first postoperative day and was discharged after seven days.
The patient did not receive any oncological treatment. 18 months following surgery the
laboratory investigation values were within normal limits and any sign of relapse was excluded
with ultrasonography. After 20 months the patient affirms that he is in good overall condition.
Conclusions. As conclusion early diagnosis and surgical treatment can improve patientâs
prognosis and disease-free survival. This work was supported by the Collegium Talentum
2019 Program of Hungary
Weighted languages recognizable by weighted tree automata
Yields of recognizable weighted tree languages, yields of local weighted tree languages, and weighted context-free languages are related. It is shown that the following five classes of weighted languages are the same: (i) the class of weighted languages generated by plain weighted context-free grammars, (ii) the class of weighted languages recognized by plain weighted tree automata, (iii) the class of weighted languages recognized by deterministic and plain topdown weighted tree automata, (iv) the class of weighted languages recognized by deterministic and plain bottom-up weighted tree automata, and (v) the class of weighted languages determined by plain weighted local systems
Mag-asztrofizika indirekt mĂłdszerekkel = Nuclear Astrophysics with indirect methods
A 3He(?,?)7Be ?(E) hatĂĄskeresztmetszetĂ©re a modellek min. 3,5% pontossĂĄgot igĂ©nyelnek. A mĂ©rĂ©si eredmĂ©nyek erĆsen szĂłrnak, ezĂ©rt a reakciĂłsebessĂ©get [?(E)] 3 fĂŒggetlen mĂłdszerrel (aktivĂĄciĂł, g-hozam Ă©s ârecoilâ szeparĂĄtor) mĂ©rtĂŒk meg. A 3 eredmĂ©ny ĂĄtlagĂ©rtĂ©ke jobb a korĂĄbbiaknĂĄl, de pontossĂĄga mĂ©g nem elegendĆ, tovĂĄbbi mĂ©rĂ©sekre van szĂŒksĂ©g. A CNO-ciklus mĂĄs reakciĂłira [14,15N(p,g)15,16O] is Ășj, meghatĂĄrozĂł ?(E) Ă©rtĂ©keket adtunk meg (LUNA). A p-folyamat vizsgĂĄlatok sorĂĄn szĂĄmos Ășj reakciĂłsebessĂ©get mĂ©rtĂŒnk Ă©s összehasonlĂtottuk Hauser-Feshbach szĂĄmolĂĄsokkal. EredmĂ©ny: proton keltette reakciĂłkra az egyezĂ©s megfelelĆ, mĂg ?-rĂ©szecskĂ©kre nem. Pontos rugalmas ?- szĂłrĂĄsainkbĂłl kapott optikai potenciĂĄlokkal szĂĄmolva sincs egyezĂ©s. A p-folyamat tanulmĂĄnyozĂĄsĂĄra egy Ășj irĂĄnyt, a (p,n) reakciĂłk alkalmazĂĄsĂĄt vezettĂŒk be. Az egyik kulcsreakciĂł [124Xe(?,gamma)128Ba] mĂ©rĂ©sĂ©hez a kamra elkĂ©szĂŒlt, tesztelĂ©se folyik. MĂ©rĂ©seinkhez fĆleg aktivĂĄciĂłs mĂłdszert hasznĂĄltunk, ezĂ©rt mĂ©rtĂŒk kĂŒlönbözĆ anyagokba implantĂĄlt aktĂv magok felezĂ©si idejĂ©nek elmĂ©letileg jĂłsolt vĂĄltozĂĄsĂĄt. Sem anyag, sem hĆmĂ©rsĂ©klet fĂŒggĂ©st nem talĂĄltunk. Nemzetközi egyĂŒttmƱködĂ©sben (OTKA IN64269) mĂ©rĂ©seket vĂ©geztĂŒnk az indirekt Trojan Horse MĂłdszerrel. BizonyĂtottuk a mĂłdszer asztrofizikai alkalmazhatĂłsĂĄgĂĄt [7Li(p,?)4He], elsĆkĂ©nt mĂ©rtĂŒnk interferencia-mentes p-p szĂłrĂĄst, valamint az 18O(p,?)15N Ă©s a 10,11B+p reakciĂłkat az un. Gamow-ablakban (közel nulla energiĂĄnĂĄl). | The 3He(?,?)7Be is a key reaction (Big-Bang; Hydrogen Burning), the ?(E) cross section should be known with a precision of 3.5%. Because of discrepancies between different results, we measured it with 3 independent methods (activation, g-yield, recoil separator). The results are consistent, the average rate improved, however, the precision is still not enough. New ?(E) values were also determined for reactions important for CNO-cycle. Astrophysical p-process: a lot of new reaction rates were measured. The results were compared with Hauser-Feshbach calculations using different particle-nucleus potentials. Conclusion: for proton induced reactions the agreement is acceptable, contrary to ?-particles. Optical potentials extracted from precise ?-elastic scattering didn't solved the problem for ?-s. A new idea, the applicability of (p,n) reactions in p-process studies was introduced. The key reaction, 124Xe(?,gamma)128Ba, is in test phase, the setup was developed. In our studies activation method was mostly used, therefore the predicted halflife changes of active nuclei implanted into different materials were checked. Neither host material nor temperature dependence was found. Experiments were performed by Trojan Horse Method in international collaboration. The applicability of that indirect method was proved (7Li+p), first time the interference-free p-p scattering as well as the 18O+p and 10,11B+p reactions at close to zero energies (no extrapolation) were measured
AutomatĂĄk, fĂĄk Ă©s logika = Automata, trees and logic
Elemi idejƱ exponenciĂĄlis algoritmus adtunk meg regulĂĄris szavak ekvivalenciĂĄjĂĄnak eldönthetĆsĂ©gĂ©re. ĂltalĂĄnosĂtottuk Kleene tĂ©telĂ©t vĂ©gtelen szavakat is felismerĆ sĂșlyozott automatĂĄkra. KifejlesztettĂŒnk egy algebrai mĂłdszert, amellyel a CTL logika szĂĄmos szegmense estĂ©n eldönthetĆ, hogy egy regulĂĄris fanyelv definiĂĄlhatĂł-e a szegmensben. VizsgĂĄltuk a faautomatĂĄk algebrai tulajdonsĂĄgait, megadtuk a felismerhetĆsĂ©g egy algebrai jellemzĂ©sĂ©t. DefiniĂĄltunk a multi-leszĂĄllĂł fatranszformĂĄtort Ă©s megmutattuk, hogy ekvivalens a determinisztikus regulĂĄris szƱkĂtĂ©sƱ felszĂĄllĂł fatranszformĂĄtorral. MeghatĂĄroztuk a lineĂĄris multi-leszĂĄllĂł osztĂĄly szĂĄmĂtĂĄsi erejĂ©t. Megmutattuk, hogy az alakmegĆrzĆ leszĂĄllĂł fatranszformĂĄtorok ekvivalensek az ĂĄtcĂmkĂ©zĆkkel Ă©s bebizonyĂtottuk, hogy az alakmegĆrzĆ tulajdonsĂĄg eldönthetĆ. Megadtuk a kavics makrĂł fatranszformĂĄciĂłk egy felbontĂĄsĂĄt Ă©s megmutattuk, hogy a kĂŒlönbözĆ cirkularitĂĄsi tulajdonsĂĄgok eldönthetĆk. Ugyancsak megadtuk a felbontĂĄst erĆs kavics kezelĂ©s estĂ©n is. ĂltalĂĄnosĂtottuk J. Engelfriet hiararchia tĂ©telĂ©t sĂșlyozott fatranszformĂĄtorokra. SĂșlyozott faautomatĂĄkra definiĂĄltuk a termĂĄtĂrĂł szemantikĂĄt Ă©s megmutattuk, hogy ekvivalens az algebari szenmatikĂĄval. Algoritmust adtunk annak eldöntĂ©sĂ©re, hogy egy polinomiĂĄlisan sĂșlyozott faautomata vĂ©ges költsĂ©gƱ-e. VizsgĂĄltuk a sĂșlyozott faautomata kĂŒlönbözĆ vĂĄltozatait: fuzzy faautomata, multioperĂĄtor monoid feletti faautomata, Ez utĂłbbi esetre ĂĄltalĂĄnosĂtottuk a Kleene tĂ©telt. | We gave an elementary algorithm for deciding the equivalence of regular words. We generalized Kleene's theorem to weighted automata processing infinite words. We developed an algebraic method that, for several segments of the CTL logic, can be applied to decide if a regular tree language can be defined in that segment. We examined algebraic properties of tree automata, and gave an algebraic characterization of recognizability. We defined multi bottom-up tree transducers and showed that they are equivalent to top-down tree transducers with regular look-ahead. We determined the computation power of the linear subclass. We showed that shape preserving bottom-up tree transducers are equivalent to relabelings. We proved that the shape preserving property is decidable. We gave a decomposition for pebble macro tree transducers and showed that certain circularity properties are decidable. We also gave a decomposition for the strong pebble handling. We have generalized the hierarchy theorem of J. Engelfriet to weighted tree transducers. We defined the term rewrite semantics of weighted tree transducers and showed that it is equivalent to the algebraic semantics. We gave a decision algorithm for the finite cost property of a polynomially weighted tree automata. We defined different versions of weighted tree automata: fuzzy tree automata, weighted tree automata over a multioperator monoid. For the latter we generalized Kleene's theorem
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