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Wyszukujesz frazę "binding energy" wg kryterium: Temat


Tytuł:
Modified Integrated Nuclear Model for the Binding Energy of Finite Nuclei
Autorzy:
Cherop, Hezekiah K.
Khanna, Kapil M.
Tematy:
Nuclear model
binding energy
binding fraction
nuclei
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Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:
https://bibliotekanauki.pl/articles/1031026.pdf  Link otwiera się w nowym oknie
Opis:
A modified integrated nuclear model (MINM) for calculating the binding energies of finite nuclei is proposed. The model is an improvement of the integrated nuclear model (INM) that was formulated based on the theory of quantum chromodynamics. MINM is a simple model that depends on the proton and neutron numbers, and a variable stability coefficient factor denoted by λ. The variable λ rectifies the inequality in the neutron to proton ratio that results from the increase in the size of the nucleus. The results of the binding fraction obtained from MINM were compared with the existing experimental data obtained from atomic mass evaluation tables, AME2016. It was found that, the root mean square deviation for the binding fractions obtained from MINM is 0.2267 MeV with respect to the experimental data, while the root mean square deviation for the binding fraction obtained from INM is 1.5801 MeV. The root mean square deviation for MINM is very small. This supports the validity of the MINM and the consequent accuracy in the values of the binding fraction for different nuclei, especially in the region whereby A>220.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interactions between osmium atoms dissolved in iron observed by the 57Fe Mössbauer spectroscopy
Autorzy:
Konieczny, R.
Idczak, R.
Chojcan, J.
Tematy:
binding energy
enthalpy of solution
iron alloys
Mössbauer spectroscopy
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Wydawca:
Instytut Chemii i Techniki Jądrowej
Powiązania:
https://bibliotekanauki.pl/articles/148144.pdf  Link otwiera się w nowym oknie
Opis:
The room temperature 57Fe Mössbauer spectra for binary iron-based solid solutions Fe1−xOsx, with x in the range 0.01 ≤ x ≤ 0.05, were analyzed in terms of binding energy Eb between two Os atoms in the Fe-Os system. The extrapolated values of Eb for x = 0 were used for computation of enthalpy of solution of osmium in iron. The result was compared with that resulting from the cellular atomic model of alloys by Miedema. The comparison shows that our fi ndings are in qualitative agreement with the Miedema’s model predictions.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modified Phenomenological Formula for the Ground State Energy of Light Nuclei
Autorzy:
Chemogos, P. K.
Muguro, K. M.
Khanna, K. M.
Tematy:
binding energy
ground state energy
isotopes
light nuclei
liquid drop model
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Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:
https://bibliotekanauki.pl/articles/1046531.pdf  Link otwiera się w nowym oknie
Opis:
A modified phenomenological formula for the ground state binding energy in the region of light nuclei is proposed. Since binding energy is proportional to the volume of a nuclide, the new formula contains a volume term proportional to the mass number A and expresses asymmetry energy and coulomb repulsion energy between protons in a much simpler form than the way it is presented in the liquid drop model. The formula is used to calculate nuclear binding energy using three terms only, namely mass number A, neutron number, N and atomic number, Z. The correspondence with the conventional Liquid drop model and with the experimental results is highly satisfactory for light nuclei. Considering a set of 60 light nuclei for A≤55, the formula yields root mean square deviation of 0.541 MeV, with respect to experimental values. This is better than conventional Liquid drop model which gives a root mean square deviation of 3.485 MeV over the same range of nuclei. The value of f is comparatively smaller for even-odd nuclei when compared to the corresponding even-even nuclei. Thus even-even nuclei are more strongly bound than odd-odd or even-odd nuclei making them more stable.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Encapsulation of l-menthol in hydroxypropyl-β-cyclodextrin and release characteristics of the inclusion complex
Autorzy:
Zhu, G.
Xiao, Z.
Zhou, R.
Niu, Y.
Tematy:
l-menthol
inclusion complex
release characteristics
binding energy
release kinetics
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Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:
https://bibliotekanauki.pl/articles/778623.pdf  Link otwiera się w nowym oknie
Opis:
l-menthol has been widely used in flavour, food and pharmaceuticals. Because of its high volatility and whisker growth, l-menthol-hydroxypropyl-β-cyclodextrin inclusion complex was produced to improve shelf-life, provide protection, and enhance the stability of l-menthol. The inclusion complex was characterized by Fourier transform infrared spectroscopy, X-ray diffraction. The results show that l-menthol was successfully encapsulated in hydroxypropyl-β-cyclodextrin. l-menthol loading capacity is about 8.44%. Geometries and binding energies of l-menthol-hydroxypropyl-β-cyclodextrin inclusion complexes were investigated using molecular mechanics calculations. The shape and orientation of the most stable complex, and the minimum binding energy were determined. L-menthol release from complex was determined by thermogravimetric analysis. Two l-menthol release rate peaks were observed at 69.3 and 279.1°C. The l-menthol release reaction order, release activation energy and the preexponential factor were obtained.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DESIGN, SYNTHESIS AND BIOLOGICAL ESTIMATION OF INNOVATIVE PYRAZOLES AS ANTICANCER AGENTS TARGETING CDK2
Autorzy:
Ibrahim, Diaa A.
Radini, Ibrahim A.
KHIDRE, Rizk E.
Tematy:
Pharmacophore
binding energy
pyrazoles
anti-proliferative activity
CDK2 inhibitors
Docking study
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Wydawca:
Polskie Towarzystwo Farmaceutyczne
Powiązania:
https://bibliotekanauki.pl/articles/895649.pdf  Link otwiera się w nowym oknie
Opis:
CDK2, which exhibits an indispensable role as an organizer of cell growth, is the powerfully studied protein Kinases objective of anticancer suppressors. The present study was dedicated to design (pharmacophore, docking, and binding energy) and to prepare an inspired derivatives of pyrazole and pyrazolo[1,5-d]pyrimidine as promising anticancer agents, which can act by targeting CDK2. The promising compounds were selected according to their fit-value and binding energy scores. The anticancer activity against MCF-7 was tested for the prepared compounds and compounds 2, 3b, and 7b showed expressive activity with IC50 1.75, 0.89 and 1.32 µM respectively. The CDK2 evaluation was carried out to estimate the efficiency of the prepared compounds as promising inhibitors. The results revealed that compound 3b with effective inhibitory activity against tumor growth and with its potent inhibition against the CDK2 enzyme with percent inhibition 86 would be a prospective anticancer agent. The prepared compounds with high biological activity could be used as lead inhibitors for the CDK2 kinase domain.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Excitonic quasimolecule consisting of two semiconductor quantum dots
Autorzy:
Pokutnyi, S.I.
Salejda, W.
Tematy:
spatially separated electron and holes
quantum dots
binding energy
Coulomb and exchange interaction
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Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/173809.pdf  Link otwiera się w nowym oknie
Opis:
The effect of a significant increase in the binding energy of the singlet ground state of an excitonic quasimolecule consisting of two CdS quantum dots, in comparison with the binding energy of a biexciton in a single crystal of CdS (almost by two orders of magnitude), has been found.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czy istnieje energia wiązania w czasoprzestrzeni Schwarzschilda-de Sittera?
Is there binding energy in Schwarzschild-de Sitter Spacetime?
Autorzy:
Kulczycki, Wojciech
Opis:
Zbadano kwestię akrecji sferycznej w czasoprzestrzeni Schwarzschilda-de Sittera z uwzględnieniem „back reaction”; przedmiotem badań była stosowalność definicji energii wiązania (zaczerpniętej z modeli wnętrza gwiazd) Ew:=B-m. Przyjęto politropowe równanie stanu gazu p=Kρ0Γ dla K=1 i różnych wartości Γ. Użyto współrzędnych współporuszających. W fizycznym zakresie parametru Γϵ(1;5/3) znaleziono wyłącznie rozwiązania akrecyjne o „energii wiązania” Ew<0. Rozwiązania o dodatniej energii wiązania znaleziono wyłącznie dla Γ<1 i dla Γ>2,8. Postawiono zatem hipotezę, że dodatnia wartość energii dla podanych zakresów parametru Γ potwierdza ich niefizyczność poprzez ich niestabilność. Drugą hipotezą jest to, że w zakresie fizycznym parametru Γ dla rozwiązań akrecyjnych Ew jest zawsze ujemna.
I studied accretion in Schwarzschild-de Sitter Spacetime including back reaction regarding the usefulness of binding energy definition (taken from modeling of star interior) Ew=B-m. I used a polytropic gas with the following equation of state: p= Kρ0Γ with K=1 and different values of Γ. I also used comoving coordinates. Within the physical interval of Γϵ(1;5/3) I found only accretion solutions with negative values of Ew. Solutions with positive values of Ew were found only for Γ<1 and Γ>2,8. Therefore, I put forward a hypothesis that positive values of Ew confirm unphysical character of these solutions. The second hypothesis is that within the physical interval of Γ for accretion solutions Ew is always negative.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
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