Initiation of Polarized State in the Tantalum Oxide Thin Films Grown by Magnetron Sputtering on a Substrate of Monocrystalline Silicon (100) Followed by Argon and Oxygen Ions

The pictures of the induced state and the surface potential distribution in thin films of tantalum oxide produced by magnetron sputtering onto a substrate of monocrystalline silicon (100) followed by low energy argon and oxygen ions was investigated by atomic force microscopy in spreading resistance and scanning Kelvin probe microscopy mode. It was shown that it is possible to polarize or depolarize the coating, and then to visualize the state of the induced polarization using an electric field applied via the conductive cantilever in contact spreading resistance microscopy mode. It was found that treatment with argon ions increases the contrast of the of the surface potential distribution maps from 1.2 V to 2,3 V for negative – 10 V voltage on the probe and from 9,6 V to 19,2 V for a positive + 10 V voltage in comparison with the oxygen ions

The biomedical application and corrosion properties of implanted materials with protective coatings

For purposes of orthopedic and trauma surgery operations various stems, spokes, screws, pins made of pure metal and alloys are widely applied. As a result of metal materials using the problems of the patient organism protection from deleterious effects of metallogenic and electrochemical reactions, metal toxicosis – complications, connected with metal ion effect on organism, arise. The present study is devoted to realization of the comparative analysis of corrosion properties of modern implanted materials and coatings in simulated body fluid and their long-term behaviour in animate organism.В даний час різні вироби з металів і сплавів широко застосовуються в сучасній ортопедії і травматології. У результаті використання металевих матеріалів виникає проблема захисту організму від електрохімічних реакцій, токсикозів і інших ускладнень, зв'язаних з негативним впливом металевих іонів на організм пацієнта. У роботі проведений порівняльний аналіз корозійних характеристик сучасних імплантаційних матеріалів і покрить у фізіологічному розчині і їхньому наступному поводженні в живому організмі.В настоящее время различные изделия из металлов и сплавов широко применяются в современной ортопедии и травматологии. В результате использования металлических материалов возникает проблема защиты организма от электрохимических реакций, токсикозов и других осложнений, связанных с негативным воздействием металлических ионов на организм пациента. В работе проведен сравнительный анализ коррозионных характеристик современных имплантационных материалов и покрытий в физиологическом растворе и их последующего поведения в живом организме

Application of Nanocomposite Coatings with Different Structural Physical and Chemical Characteristics in Tissue Engineering

The research covers the results of experimental studies of the effect character of nanocomposite coatings with different physical and chemical parameters (type, roughness, hydrophilic-hydrophobic characteristics) on structural and functional properties (adhesive potential, phenotype, gene expression) of mesenchymal stem cells (MSCs). On the tested nanocoatings (Al2O3, ZrO2, Ta2O5) the capability of oxide coating Al2O3 to enrich the in vitro cultured bone marrow (BM) with the cells of MSCs phenotype markers as well as to increase the expression rate of ido gene in them, which may extend the spectrum of their therapeutic application in clinics, has been found. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3496

Application of Nanocomposite Coatings with Different Structural Physical and Chemical Characteristics in Tissue Engineering

The research covers the results of experimental studies of the effect character of nanocomposite coatings with different physical and chemical parameters (type, roughness, hydrophilic-hydrophobic characteristics) on structural and functional properties (adhesive potential, phenotype, gene expression) of mesenchymal stem cells (MSCs). On the tested nanocoatings (Al2O3, ZrO2, Ta2O5) the capability of oxide coating Al2O3 to enrich the in vitro cultured bone marrow (BM) with the cells of MSCs phenotype markers as well as to increase the expression rate of ido gene in them, which may extend the spectrum of their therapeutic application in clinics, has been found. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3496

The study of the oxide coating effect on bone–implant interface formation by means of electron microscopy method with energy dispersive x-ray analysis

The experimental results of the measurement of the tissue constituent elements distribution, as well as impurity elements in the tissues around a Ti-implant with protective TiO₂ oxide coating are presented. Study of morphology, qualitative and quantitative analysis were carried out by means of scanning electron microscopy method with energy dispersive X-ray analysis. The results show weak migration of Ti into the bone tissue near the interface and protective role of the oxide coatings.Представлено експериментальні результати дослідження розподілу елементів, що входять до складу кісткової тканини та слідів елементів у тканинах навколо титанового імплантату з захисним покриттям ТiO₂. Дослідження морфології, кількісний та якісний аналіз проводили за допомогою методу скануючої електронної мікроскопії з рентгенівським мікроаналізом. Результати показали слабку міграцію титану в кісткову тканину біля інтерфейсу та біосумісність оксидних покриттів.Представлены экспериментальные результаты исследования распределения элементов, составляющих костную ткань и примесей элементов в тканях вокруг титанового имплантата с защитным покрытием ТiO₂. Изучение морфологии, количественный и качественный анализ проводили с помощью метода сканирующей электронной микроскопии с рентгеновским микроанализом. Результаты показали слабую миграцию титана в костную ткань возле интерфейса и биосовместимость оксидных покрытий

Shrinking a large dataset to identify variables associated with increased risk of Plasmodium falciparum infection in Western Kenya

Large datasets are often not amenable to analysis using traditional single-step approaches. Here, our general objective was to apply imputation techniques, principal component analysis (PCA), elastic net and generalized linear models to a large dataset in a systematic approach to extract the most meaningful predictors for a health outcome. We extracted predictors for Plasmodium falciparum infection, from a large covariate dataset while facing limited numbers of observations, using data from the People, Animals, and their Zoonoses (PAZ) project to demonstrate these techniques: data collected from 415 homesteads in western Kenya, contained over 1500 variables that describe the health, environment, and social factors of the humans, livestock, and the homesteads in which they reside. The wide, sparse dataset was simplified to 42 predictors of P. falciparum malaria infection and wealth rankings were produced for all homesteads. The 42 predictors make biological sense and are supported by previous studies. This systematic data-mining approach we used would make many large datasets more manageable and informative for decision-making processes and health policy prioritization

Global Search for New Physics with 2.0/fb at CDF

Data collected in Run II of the Fermilab Tevatron are searched for indications of new electroweak-scale physics. Rather than focusing on particular new physics scenarios, CDF data are analyzed for discrepancies with the standard model prediction. A model-independent approach (Vista) considers gross features of the data, and is sensitive to new large cross-section physics. Further sensitivity to new physics is provided by two additional algorithms: a Bump Hunter searches invariant mass distributions for "bumps" that could indicate resonant production of new particles; and the Sleuth procedure scans for data excesses at large summed transverse momentum. This combined global search for new physics in 2.0/fb of ppbar collisions at sqrt(s)=1.96 TeV reveals no indication of physics beyond the standard model.Comment: 8 pages, 7 figures. Final version which appeared in Physical Review D Rapid Communication

Observation of Orbitally Excited B_s Mesons

We report the first observation of two narrow resonances consistent with states of orbitally excited (L=1) B_s mesons using 1 fb^{-1} of ppbar collisions at sqrt{s} = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron. We use two-body decays into K^- and B^+ mesons reconstructed as B^+ \to J/\psi K^+, J/\psi \to \mu^+ \mu^- or B^+ \to \bar{D}^0 \pi^+, \bar{D}^0 \to K^+ \pi^-. We deduce the masses of the two states to be m(B_{s1}) = 5829.4 +- 0.7 MeV/c^2 and m(B_{s2}^*) = 5839.7 +- 0.7 MeV/c^2.Comment: Version accepted and published by Phys. Rev. Let

Measurement of the Bottom-Strange Meson Mixing Phase in the Full CDF Data Set

We report a measurement of the bottom-strange meson mixing phase \beta_s using the time evolution of B0_s -> J/\psi (->\mu+\mu-) \phi (-> K+ K-) decays in which the quark-flavor content of the bottom-strange meson is identified at production. This measurement uses the full data set of proton-antiproton collisions at sqrt(s)= 1.96 TeV collected by the Collider Detector experiment at the Fermilab Tevatron, corresponding to 9.6 fb-1 of integrated luminosity. We report confidence regions in the two-dimensional space of \beta_s and the B0_s decay-width difference \Delta\Gamma_s, and measure \beta_s in [-\pi/2, -1.51] U [-0.06, 0.30] U [1.26, \pi/2] at the 68% confidence level, in agreement with the standard model expectation. Assuming the standard model value of \beta_s, we also determine \Delta\Gamma_s = 0.068 +- 0.026 (stat) +- 0.009 (syst) ps-1 and the mean B0_s lifetime, \tau_s = 1.528 +- 0.019 (stat) +- 0.009 (syst) ps, which are consistent and competitive with determinations by other experiments.Comment: 8 pages, 2 figures, Phys. Rev. Lett 109, 171802 (2012