Debye Limiting Law Violation in Clusters and Nanostructures

In this work fractal continuum model of condensed matter was used. Calculations of vibrational spectra of molecular clusters were carried out. It was established that temperature changes of heat capacity associated to intermolecular oscillations in clusters does not obey Debye limiting law. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3524

Посухостійкість гібридів яблуні з участю сорту Видубицька плакуча в умовах Лісостепу України

Objective – to determine the drought-resistance of hybrids of Vydubytska plakucha apple × Malus domestica Borkh cultivars in Forest-Steppe of Ukraine, waterlogging of tissues, water-retaining capacity, the general deficit of water in leaves and their turgorisation. Material and methods. The drought tolerance of 15 hybrids of the apple of the Vydubytska plakucha × cultivers M. domestica from the gene-pool M.M. Gryshko National Botanical Garden of the NAS of Ukraine. Hyb ri dization was carried out to obtain decorative forms, apple trees with a sign of «weeping», inherited from the сultivar Vydubytska plakucha. Results. The greatest amount of water was recorded in the leaves of hybrids of the V. p. × Khoroshovka (56.8 %), V. p. × 1–22 (54.3 %), the smallest – in the leaves of hybrids V. p. × Oranzheve (51.6 %), V. p. × Uralske nalyvne (50.0 %). Water deficiency in the leaves was 15–25 %, which does not lead to lethal damage to plants. A high percentage of the moisture content was characteristic of the V. p. × Khoroshovka, and the lowest was the hybrid of the V. p. × Renet Koksa Oranzhevyy. Conclusion. The most drought-resistant are the hybrids of V. p. × Khoroshovka and V. p. × Luyiza, less stable – V. p. × Renet Koksa Oranzhevyy, V. p. × Uralske nalyvne, V. p. × Antor, the intermediate place is occupied by hybrid V. p. × Uelsi.Мета – визначити посухостійкість гібридів яблуні ‘Видубицька плакуча’ × сорти Malus domestica Borkh. у Лісостепу України, обводненість тканин, водоутримувальну здатність, загальний дефіцит води у листках та їх тургорисцентність. Матеріал та методи. Оцінено посухостійкість 15 гібридів яблуні 'Видубицька плакуча' × сорти M. domestica з генофонду Національного ботанічного саду імені М.М. Гришка НАН України. Гібридизацію було проведено для одержання декоративних форм яблуні з ознакою “плакучість”, успадкованою від сорту ‘Видубицька плакуча’. Результати. Найбільшу кількість води відзначено в листках гібридів В. п. × Хорошовка (56,8 %), В. п. × 1-22 (54,3 %), найменшу – в листках гібридів В. п. × Оранжеве (51,6 %), В. п. × Уральське наливне (50,0 %). Водний дефіцит у листках становив 15—25 %, що не призводить до летального пошкодження рослин. Найвищим відсотком утримання вологи характеризувалися В. п. × Хорошовка, а найнижчим – гібрид В. п. × Ренет Кокса Оранжевий. Висновок. Найпосухостійкішими є гібриди В. п. × Хорошовка та В. п. × Луїза, менш стійкими – В. п. × Ренет Кокса Оранжевий, В. п. × Уральське наливне, В. п. × Антор, проміжне місце посідає гібрид В. п. × Уєлсі

Functional Coatings Based on Hydroxyapatite and Polymers Formed on Ti-6Al-4V Substrates

The paper describes perspective technology for deposition of inorganic-organic coatings used for biomedical application. Synthetic hydroxyapatite was used as inorganic compound, due to the similarity of the main component to bone tissue. As organic components we used chitosan and alginate – natural biopolymers, which widely used for bioactive and biocompatible composites formation. Thermal substrate method used for coatings deposition based on principle of decreasing solubility of hydroxyapatite with increasing of substrate temperature and allow to deposit coatings at substrate temperatures below 100 °C. Porous composite hydroxyapatite-chitosan and hydroxyapatite-alginate coatings were obtained on Ti-6Al-4V substrates. Morphology, phase composition and adhesion to the substrate surface were investigated. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3529

Baxter Q-operator and Separation of Variables for the open SL(2,R) spin chain

We construct the Baxter Q-operator and the representation of the Separated Variables (SoV) for the homogeneous open SL(2,R) spin chain. Applying the diagrammatical approach, we calculate Sklyanin's integration measure in the separated variables and obtain the solution to the spectral problem for the model in terms of the eigenvalues of the Q-operator. We show that the transition kernel to the SoV representation is factorized into the product of certain operators each depending on a single separated variable. As a consequence, it has a universal pyramid-like form that has been already observed for various quantum integrable models such as periodic Toda chain, closed SL(2,R) and SL(2,C) spin chains.Comment: 29 pages, 9 figures, Latex styl

Preclinical antitumor activity of the diindolylmethane formulation in xenograft mouse model of prostate cancer

Aim: Preclinical study of the specific anticancer pharmacological activity of the formulation containing active substance 3,3ʹ-diindolylmethane (DIM), cod liver oil, polysorbate 80 and α-tocopherol acetate (vitamin E), in vivo in a xenograft animal model of LNCaP. Materials and Methods: The DIM, cod liver oil, polysorbate 80 and α-tocopherol acetate (vitamin E) formulation was intragastrically administered to BALB/c-nude (nu/nu) mice during 33 days post inoculation at the dose of 133 mg/kg/day. Antitumor activity of the test drug was estimated by the rate of tumor growth inhibition (T/C% — treated versus control), dividing the tumor volumes from treatment groups with the control groups. Results: Statistically significant tumor xenograft regressions have been shown in group which received the DIM, cod liver oil, polysorbate 80 and α-tocopherol acetate (vitamin E) on the 37th day of observation post inoculation. The highest antitumor activity was achieved on the 39th day (T/C = 16,8%). Therapeutic effect lasts for 6 days after the end of therapy period. Conclusion: Our findings demonstrate inhibitory effect of the formulation on tumor development in the xenograft animal model due to the tumor growth rate reduction. Key Words: 3,3´-diindolylmethane, bioavailability, anticancer activity, xenograft model, LNCaP cell line, preclinical studies

Separation of variables for the quantum SL(2,R) spin chain

We construct representation of the Separated Variables (SoV) for the quantum SL(2,R) Heisenberg closed spin chain and obtain the integral representation for the eigenfunctions of the model. We calculate explicitly the Sklyanin measure defining the scalar product in the SoV representation and demonstrate that the language of Feynman diagrams is extremely useful in establishing various properties of the model. The kernel of the unitary transformation to the SoV representation is described by the same "pyramid diagram" as appeared before in the SoV representation for the SL(2,C) spin magnet. We argue that this kernel is given by the product of the Baxter Q-operators projected onto a special reference state.Comment: 26 pages, Latex style, 9 figures. References corrected, minor stylistic changes, version to be publishe

Electric field gradients in MgB2_2 synthesized at high pressure: 111^111Cd TDPAC study and ab initio calculation

We report the high-pressure synthesis of novel superconductor MgB$_2$ and some related compounds. The superconducting transition temperature of our samples of MgB$_2$ is equal to 36.6 K. The MgB$_2$ lattice parameters determined via X-ray diffraction are in excellent agreement with results of our ab initio calculations. The time-differential perturbed angular correlation (TDPAC) experiments demonstrate a small increase in quadrupole frequency of $^111$Cd probe with decreasing temperature from 293 to 4.2 K. The electric field gradient (EFG) at the B site calculated from first principles is in fair agreement with EFG obtained from $^11$B NMR spectra of MgB$_2$ reported in the literature. It is also very close to EFG found in our $^111$Cd TDPAC measurements, which suggests that the $^111$Cd probe substitutes for boron in the MgB$_2$ lattice.Comment: 10 pages, 3 figure

Optical Multicolor WBVR-Observations of the X-Ray Star V1341 Cyg = Cyg X-2 in 1986-1992

We present the results of $WBVR$ observations of the low-mass X-ray binary V1341 $\textrm{Cyg} = \textrm{Cyg}$ X--2. Our observations include a total of 2375 individual measurements in four bands on 478 nights in 1986-1992. We tied the comparison and check stars used for the binary to the $WBVR$ catalog using their $JHK$ magnitudes. The uncertainty of this procedure was 3$$ in the $B$ and $V$ bands and 8%-10% for the $W$ and $R$ bands. In quiescence, the amplitude of the periodic component in the binary's $B$ brightness variations is within $0.265^{m}{-}0.278^{m}$ ($0.290^{m}{-}0.320^{m}$ in $W$); this is due to the ellipsoidal shape of the optical component, which is distorted with gravitational forces from the X-ray component. Some of the system's active states (long flares) may be due to instabilities in the accretion disk, and possibly to instabilities of gas flows and other accretion structures. The binary possesses a low-luminosity accretion disk. The light curves reveal no indications of an eclipse near the phases of the upper and lower conjunctions in quiescence or in active states during the observed intervals. We conclude that the optical star in the close binary V1341 $\textrm{Cyg} = \textrm{Cyg}$ X-2 is a red giant rather than a blue straggler. We studied the long-term variability of the binary during the seven years covered by our observations. The optical observations presented in this study are compared to X-ray data from the Ginga observatory for the same time intervals.Comment: 35 pages, 8 figure

Structural Properties of Magnesium Oxide Thin Films Deposited by Spray Pyrolysis Technique

In this work, structural properties of magnesium oxide films have studied by X-ray diffraction methods. MgO obtained by spray pyrolysis technique at the different substrate temperatures on the glass substrates. The 0.2 M magnesium chloride hexahydrate aqueous solution was selected as a precursor in the solution. The influence of substrate temperature on the phase composition, texture quality, coherent scattering domain size and lattice constant of the material was investigated. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3710

Effect of electron irradiation on transparent conductive films ZnO:Al deposited at different sputtering power

Transparent conductive oxide thin films of Al-doped ZnO grown by rf magnetron sputtering were irradiated with high energy electrons with the energy 12.6 MeV and fluence 5·10¹⁴ e/cm². The films were produced using different sputtering powers. It has been shown that electron irradiation creates defects that lead to distortions of the crystal lattice, which results in reduced crystallinity of the films. Also, it leads to film heating that results in radiation annealing and relaxation of the lattice