bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimal interference of the tibial component of the cementless Oxford Unicompartmental Knee Replacement
Authors: Campi S. , Mellon S. J. , Ridley D. , Foulke B. , Dodd C. A. F. , Pandit H. G. , Murray D. W.
Published: March 2018

Objectives

The primary stability of the cementless Oxford Unicompartmental Knee Replacement (OUKR) relies on interference fit (or press fit). Insufficient interference may cause implant loosening, whilst excessive interference could cause bone damage and fracture. The aim of this study was to identify the optimal interference fit by measuring the force required to seat the tibial component of the cementless OUKR (push-in force) and the force required to remove the component (pull-out force).

Materials and Methods

Six cementless OUKR tibial components were implanted in 12 new slots prepared on blocks of solid polyurethane foam (20 pounds per cubic foot (PCF), Sawbones, Malmo, Sweden) with a range of interference of 0.1 mm to 1.9 mm using a Dartec materials testing machine HC10 (Zwick Ltd, Herefordshire, United Kingdom) . The experiment was repeated with cellular polyurethane foam (15 PCF), which is a more porous analogue for trabecular bone.

Results

The push-in force progressively increased with increasing interference. The pull-out force was related in a non-linear fashion to interference, decreasing with higher interference. Compared with the current nominal interference, a lower interference would reduce the push-in forces by up to 45% (p < 0.001 One way ANOVA) ensuring comparable (or improved) pull-out forces (p > 0.05 Bonferroni post hoc test). With the more porous bone analogue, although the forces were lower, the relationship between interference and push-in and pull-out force were similar.

Conclusions

This study suggests that decreasing the interference fit of the tibial component of the cementless OUKR reduces the push-in force and can increase the pull-out force. An optimal interference fit may both improve primary fixation and decrease the risk of fracture. Cite this article: S. Campi, S. J. Mellon, D. Ridley, B. Foulke, C. A. F. Dodd, H. G. Pandit, D. W. Murray. Optimal interference of the tibial component of the cementless Oxford Unicompartmental Knee Replacement. Bone Joint Res 2018;7:226–231. DOI: 10.1302/2046-3758.73.BJR-2017-0193.R1.
The help-seeking process among women victims of partner violence in Italy
Authors: Bastiani Federica , Saurel-Cubizolles Marie-Josèphe , Romito Patrizia
Published: March 2018

Looking for support has a central role in the process of escaping violence. This study aims to investigate which sources of help women victims of intimate partner violence (IPV) contacted before arriving at an anti-violence centre (AVC), and to analyse the links with the women’s characteristics, their history of violence and the involvement of children. A cross-sectional study was conducted among 151 women arriving at five AVCs in Italy, where they filled in a self-administered questionnaire. Women reported high levels of violence; children were closely involved. Only two women reported no previous contact with sources of help; 33.1 per cent of the sample contacted four or more sources. Non-Italian women were more likely to contact four or more sources of help; having children was linked to more contacts with social workers; more severe violence was linked to more contacts with law enforcement agents. When children were involved in violence, the odds ratio for contacting four or more sources of help increased significantly, also after controlling for women’s nationality (adjusted odds ratio 9.47, p<0.05). This study provides evidence of the active behaviour of victims of violence and of the role played by children’s involvement in women’s help-seeking behaviour.
The impact of cooperative learning and direct instruction on Saravan Islamic Azad university studentâ€™s math progress in first half of educational year 2013-2014
Authors: Parsafar Abdol Hamid , Nosrat Azizollah
Published: March 2018

The aim of this study is to compare the impact of cooperative learning and direct instruction on Saravan Islamic Azad University studentâ€™s math progress in first half of educational year 2013-2014. Research method is semi â€“ trial of unequal control group with pre and post â€“ test. Population of the sample includes all students of first half of 2013-2014 educational year that have taken math courses in Saravan Unit and the number of them is 130. 65 subjects are in control group and 65 subjects are in test group. There were 35 female students and 30 male students in each group. Measurement tools in this study are researcher built math progress and Rionâ€™s Intelligence test. Subjects of the study first participated in pre â€“ tests and then instructed by cooperative learning method for 10 weeks and after that post â€“ tests were done and required data were collected. In order to analyze the data, t-test was used. Results showed that math progress of test group with cooperative method, was higher than the control group that were instructed by direct method and the difference was significant .in addition, it was con-cluded that there is no significant math progress in two females and males groups.
Sustainability Learning Labs in Small Island Developing States: A Case Study of the Seychelles
Authors: Krütli Pius , Pohl Christian , Stauffacher Michael
Published: March 2018

The teaching component is widely lacking in the discussion of real-world laboratories. We introduce a sustainability learning lab, where students both profit from this platform and also contribute to the success of the lab.In the discussion of real-world laboratories, the teaching
component is widely lacking. We address this by introducing a prototype of a sustainability learning lab (SLL) in the global South using a case study of the Seychelles as an example. In 2015 the Transdisciplinarity Lab (TdLab) of ETH Zurich initiated a long-term collaboration with the University
of Seychelles (UniSey) and the Ministry of Environment, Energy and Climate Change (MEECC). Teaching activities include transdisciplinary case studies (tdCS) for students from UniSey and ETH, alternated with courses for UniSey only. BSc and MSc theses as well as internships complement these.
In 2016 the TdLab, UniSey and MEECC jointly decided to focus on solid waste in a tdCS that engaged 18 ETH and 18 UniSey students with diverse backgrounds. This collaborative approach in a real-world setting with students from different cultures and engaging with a broad range of stakeholders
is promising. Students managed to bring novel observations and insights to the surface. Thus, students both profit from this learning platform and also contribute substantially to the further development of the SLL.
Transitioning Urban Experiments: Reflections on Doing Action Research with Urban Labs
Authors: Scholl Christian , de Kraker Joop , Hoeflehner Thomas , Wlasak Petra , Drage Thomas , Eriksen Mette Agger
Published: March 2018

There is a large diversity in lab approaches. We contribute to a much needed evaluation by reflecting on a specific transdisciplinary action research approach that transforms a conventional innovation project into a transition experiment. We show how the approach could be adapted in
order to be applied to urban labs focusing on sustainability transitions in governance systems.Urban labs have gained popularity throughout Europe. They are a manifestation of the search for new forms of urban governance capable of addressing the complex problems that cities are facing
nowadays. These labs typically aim to create space for transdisciplinary research, co-creation and experimenting with potential solutions to sustainability challenges. In urban labs in four European cities, we applied a specific transdisciplinary action research approach labelled as “transitioning
of (urban lab) experiments”. Our approach consists of four steps: co-design of experiments, setting explicit learning goals, evaluating what has been learned, and dissemination and embedding of lessons learned. Critically reflecting on the difficulties encountered in the implementation
of the transitioning approach, we conclude that it must be adapted when applied to urban labs focusing on sustainability transitions in institutional and governance systems rather than in socio-technical systems. We provide recommendations as to how the approach could be adapted.
Structure Matters: Real-World Laboratories as a New Type of Large-Scale Research Infrastructure: A Framework Inspired by Giddens' Structuration Theory
Authors: Schneidewind Uwe , Augenstein Karoline , Stelzer Franziska , Wanner Matthias
Published: March 2018

In order to grasp the transformative potential of real-world laboratories, it is essential to understand them as a large-scale research infrastructure. Unlike single transdisciplinary projects and processes, real-world labs are not only about temporary interventions or knowledge integration.
They are also about establishing long-lasting spaces for transformation and reflexive learning.
Tensions and Trade-offs in Real-World Laboratories - The Participants' Perspective
Authors: Engels Franziska , Rogge Jan-Christoph
Published: March 2018

Real-world laboratories have made their way into policy programs and corporate agendas. They are expected to foster innovation on both the local and wider societal scales through co-creative settings in the “real world”. Yet little attention has been paid to how these multiple
expectations affect micro-level practices and pose challenges for the heterogeneous actors involved in these settings. Two case studies show the emerging tensions relating to participation, temporality and space, and the ways in which participants perceive and deal with them.
Why “is at”? —On Quine’s Objection to Carnap’s Aufbau in “Two Dogmas of Empiricism”
Authors: Lam Ka Ho
Published: March 2018

In “Two Dogmas”, Quine indicates that Carnap’s Aufbau fails “in principle” to reduce our knowledge of the external world to sense data. This is because in projecting the sensory material to reconstruct the physical world, Carnap gives up the use of operating rules and switches to a procedure informed by general principles. This procedure falls short of providing an eliminative translation for the connective “is at”, which is necessary for the reduction. In dissecting Quine’s objection, I argue that Quine has at best proven the claim that the use of general principles essentially fails the task of radical reductionism. However, in order to establish the conclusion that the Aufbau fails in principle, Quine needs to further vindicate two other claims. They are: first, a switch from operating rules to general principles is necessary; second, the set of general principles Carnap adopts is the best alternative. By disambiguating the notion of “explicit definition” and examining the concept of definability in the Aufbau, I explore the possibility of justifying these two claims that Quine overlooks in his objection. The result suggests that Quine’s objection stands in tension with his radical reductionist reading of the Aufbau.
Anna Boncompagni, Wittgenstein and Pragmatism
Authors: Coliva Annalisa
Published: March 2018

London: Palgrave Macmillan, 2016.311 + xv pages. $63 Hardcover. ISBN 978-1-137-58846-3.Reviewed by Annalisa Coliva.
Influence of Power Clean Ability and Training Age on Adaptations to Weightlifting-Style Training
Authors: James Lachlan P. , Comfort Paul , Suchomel Timothy J. , Kelly Vincent G. , Beckman Emma M. , Haff G. Gregory
Published: March 2018

James, LP, Comfort, P, Suchomel, TJ, Kelly, VG, Beckman, EM, and Haff, GG. Influence of power clean ability and training age on adaptations to weightlifting-style training. J Strength Cond Res 33(11): 2936–2944, 2019—The purpose of this investigation was to determine whether weightlifting actions are a viable method for improving athletic performance among weaker, inexperienced lifters when compared with individuals with a greater power clean (PC) result, and hence weightlifting ability and experience. Two groups of males with distinctly different PC performances (higher performance [HP]: N = 8; body mass [BM] = 78.1 ± 4.0 kg; 1 repetition maximum [1RM] PC = 1.08 ± 0.09 kg·BM−1; lower performance [LP]: N = 8; BM = 82.6 ± 14.0 kg; 1RM PC = 0.78 ± 0.1 kg·BM−1) and resistance training age (HP: resistance training experience = 3.5 ± 1.2 years; LP: resistance training experience = 1.44 ± 1.50 years) undertook 10 weeks of training involving weightlifting derivatives, in addition to supplemental ballistic and plyometric exercises. Testing of athletic performance (represented by measures derived from the countermovement jump) occurred at baseline, after 5 weeks of training, and after 10 weeks of training. Both groups significantly improved across the majority of outcome variables after training (Hedges' g = 0.98–2.55, p ≤ 0.01–0.05). Only the HP participants experienced significant changes at midtest (g = 0.99–1.27, p ≤ 0.01–0.05), whereas no significant changes were revealed between midtest and posttest in this group. In contrast to this, the LP participants displayed a significant improvement in relative impulse (g = 1.39, p < 0.01) and rate of force development (g = 1.91, p < 0.01) during this final period (p < 0.01). As weaker, inexperienced lifters underwent a significant and meaningful enhancement in maximal neuromuscular measures after weightlifting derivative-focused training, practitioners should consider early implementation of such exercises. However, it is important for coaches to note that a delayed training effect might be present in weaker, less experienced lifters.
Biological modification of mechanical properties of the sea surface microlayer, influencing waves, ripples, foam and air-sea fluxes
Authors: Jenkinson Ian R. , Seuront Laurent , Ding Haibing , Elias Florence
Published: March 2018

Gas exchange reduction (GER) at the air-sea interface is positively related to the concentration of organic matter (OM) in the top centimetre of the ocean, as well as to phytoplankton abundance and primary production. The mechanisms relating OM to GER remain unclear, but may involve mechanical (rheological) damping of turbulence in the water immediately below the surface microlayer, damping of ripples and blocking of molecular diffusion by layers of OM, as well as electrical effects. To help guide future research in GER, particularly of CO2, we review published rheological properties of ocean water and cultures of phytoplankton and bacteria in both 3D and 2D deformation geometries, in water from both the surface layer and underlying water. Production of foam modulates air-sea exchange of many properties and substances, perhaps including climate-changing gases such as CO2. We thus also review biological modulation of production and decay of whitecaps and other sea foam. In the ocean literature on biological production of OM, particularly that which associates with the sea surface, the terms “surfactant” and “surface-active” have been given a variety of meanings that are sometimes vague, and may confuse. We therefore propose a more restricted definition of these terms in line with usage in surface science and organic chemistry. Finally, possible changes in OM-modulated GER are presented in relation to predicted global environmental changes.
Razvijanje interkulturalne kompetencije u ranom i predškolskom odgoju i obrazovanju
Authors: Bedeković Vesna , Šimić Marija
Published: March 2018

Susreti različitih kultura u današnjem globalnom multikulturalnom društvu događaju se gotovo svakog trena u najraznovrsnijim oblicima komuniciranja. Interkulturalna komunikacija zbog sve izraženije međuovisnosti među ljudima različitih kultura, religija, jezika i svjetonazora postala je realnost svakodnevnog života, pri čemu susreti kultura podrazumijevaju nužnost kvalitetnog međusobnog suodnosa temeljenog na ideji interkulturalizma. S obzirom na to da se djetinjstvo smatra izuzetno važnim razdobljem ljudskoga života, ustanove ranog i predškolskog odgoja i obrazovanja predstavljaju mjesta prve formalne izvanobiteljske socijalizacije i najranijeg institucionalnog prenošenja društveno prihvaćenih normi i vrijednosti, kao i mjesta u kojima se ostvaruju obrasci interkulturalnog odnosa primjenjivi u društvu. U radu je dan prikaz rezultata empirijskog istraživanja koje je imalo za cilj utvrditi razinu osnovnih znanja u području interkulturalizma i ispitati poželjne interkulturalne kompetencije odgajatelja te učinkovitost interkulturalnog djelovanja u procesu ranog i predškolskog odgoja i obrazovanja.
Short-term effects of transdermal estradiol in men undergoing androgen deprivation therapy for prostate cancer: a randomized placebo-controlled trial
Authors: Russell Nicholas , Hoermann Rudolf , Cheung Ada S , Ching Michael , Zajac Jeffrey D , Handelsman David J , Grossmann Mathis
Published: March 2018

Objective

There is increasing recognition that, in men, some biological actions attributed to testosterone (TS) are mediated by estradiol (E2). This study used two low doses of daily transdermal E2 gel to assess the effects on circulating E2 concentrations in men with prostate cancer with suppressed endogenous E2 production arising from androgen deprivation therapy (ADT). Secondarily, we aimed to assess short-term biological effects of E2 add-back without increasing circulating TS.

Design

28-day randomised, placebo-controlled trial.

Methods

37 participants were randomised to either 0.9 or 1.8 mg of 0.1% E2 gel per day or matched placebo gel. Fasting morning serum hormones, quality of life questionnaires, and treatment side effects were evaluated at baseline, days 14 and 28. Hot flush diaries and other biochemical measurements were completed at baseline and study end.

Results

Transdermal E2 significantly raised serum E2 from baseline to day 28 compared to placebo in the 0.9 mg dose group (median: 208 pmol/L; interquartile range: 157–332) and in the 1.8 mg dose group (median: 220 pmol/L; interquartile range: 144–660). E2 treatment reduced hot flush frequency and severity as well as beta carboxyl-terminal type 1 collagen telopeptide.

Conclusion

In men with castrate levels of E2 and TS, daily transdermal E2: 0.9–1.8 mg increased median serum E2 concentrations into the reference range reported for healthy men, but with substantial variability. E2 treatment reduced hot flushes and bone resorption. Larger studies will be required to test whether low-dose E2 treatment can mitigate ADT-associated adverse effects without E2-related toxicity.
The Influence of Electron-Hole Exchange Interaction of Colloidal CdSQuantum Dots on the Value of the Resonant Stokes Shift
Authors: Boichuk V.І. , Sokolnyk O.A. , Leshko R.Ya.
Published: March 2018

On the basis of the model of the multiband valence band the exiton energy was calculated in the CdSnanocrystals as a function of quantum dot radius. The dependence of the resonance Stokes shift was analized and the comparison with the corresponding experimental data were provided.
P-V Centers Behavior in Diamond C(111) Subsurface Layers
Authors: Ananina O. , Severina Elena
Published: March 2018

Quantum-chemical modeling is used to study the dependence of spin states, geometrical, electronic and energy characteristics of P-V center from its location on the surface of the diamond C(111). The (111) surface of diamond crystal is found to affect the geometrical parameters, charge characteristics and spin density distribution of P-V centers.
The Luminescent Centra in thin Films of β–Ga2O3 and (Y0.06Ga0.94)2O3
Authors: Bordun O.M. , Bordun B.O. , Kukharskyy I.Yo. , Medvid I.I.
Published: March 2018

Photoexcitation and photoluminescence spectra of b–Ga2O3 and (Y0.06Ga0.94)2O3 thin films obtained by high-frequency ion-plasmous sputtering was investigated. Luminescence spectra were factorized on ultimate constituents using Alentsev-Fock method. The nature of two intensive luminescent band with maxima in region 3.00 and 3.15 eV and two faint intensive luminescent band with maxima in region 4.00 and 4.25 eV was discussion. Luminescence decay time for band with maximum in region 3.00 and 3.15 eV in different types of b–Ga2O3 and (Y0.06Ga0.94)2O3 thin films was established.
Effect of pH of the Reaction Mediumon the Structure and Properties of Spinel-Type Ferrite Nanopowder
Authors: Ostafiychuk B.K. , Nykoliuk M.O. , Hrubyak A.B. , Kaykan Y.S. , Kaykan L.S.
Published: March 2018

In this work using sol-gel auto-combustion synthesis was synthesised single-phase magnesium-substituted lithium ferrite at different pH reaction medium. The synthesized materials were investigated by X-ray and Mossbauer methods. It was shown that the pH of the reaction medium plays a crucial role in the formation of the microstructure and properties of synthesized systems.
Effect of pH of Synthesis on CdS/L-cys Colloidal Solutions Optical Properties
Authors: Krupko O.V. , Shcherbak L.P. , Khalavka Yu.B.
Published: March 2018

Using the measurements of absorption spectra and photoluminescence, as well as electron microscopic studies, the limits of concentrations of cadmium and sulfur ions and the stabilizer L-cysteine, suitable for obtaining stable colloidal solutions of quantum dots (size 1 - 5 nm) with CdS and high quantum yield. The influence of the initial pH values ​​of the reaction system within 7 - 11 on the absorption edge, photoluminescence and quantum yield of colloidal solutions of CdS / L-cis nanoparticles is shown. The results were systematized using the simplex lattice design of the Chefe method.
Nanostructured Anodic Oxide Films of Niobium: Features of Electrochemical Formation, Functional Properties and Applications (Review)
Authors: Вayrachniy B. I. , Tokareva I. A.
Published: March 2018

The review summarizes data on the anodic behavior of niobium in aqueous solutions. Features of electrochemical formation nanostructured oxide coatings on niobium by anodic oxidation are systematized. The article deals with theoretical aspects formation of the porous anodic oxide layers. The influence of process parameters and the characteristics of the electrolyte on layer of niobium oxide were analyzed. The functional properties of porous coating on niobium are considered and promising areas of practical application identified.
Vanadium and Chlorine doping Influence on Magnetic Susceptibility of Cd0.9Zn0.1Te Monocrystals
Authors: Brytan V.B. , Pavlovskyy Yu.V. , Uhryn Yu.O. , Peleshchak R.M.
Published: March 2018

The magnetic field experimental dependences of vanadium and chlorine doped Cd1-xZnxTe monocrystals magnetic susceptibility have been research. The magnetic susceptibility non-linearity has been observed. It is shown that this non-linearity due to super paramagnetic nature magnetic clusters forming.
Electric and photoelectric properties of solid solutions Ag2In2Si(Ge)Se6
Authors: Zamuruieva O.V. , Khvyshchu M.V. , Parasyuk O.V. , Myronchuk G.L.
Published: March 2018

Temperature depen-dences of specific dark conductivity and spectral distributions ofphotoconductivity have been studied. It has been established thatthe Ag2In2SiSe6and Ag2In2GeSe6single crystals are high-resistancesemiconductors withp-type conductivity.  The interpretation of experimental results conducted under the Mott model for disordered systems. Thus, from the experimental results follows that the solid solution AgInSe2 - Si(Ge)Se2 when the temperature drops from 300 to 200 K, the conductivity in the area carried thermo excited permitted carriers impurity activation energy of ~ 0.59eV and 0.48eV for Ag2In2SiSe6 and Ag2In2GeSe6 respectively.
Investigation of Crystal and Electronic Structures Features of Hf1-xTmxNiSn Semiconductor Solid Solution
Authors: Romaka L.P. , Rogl P.-F. , Нoryn A.M. , Krayovskyy V.Ya. , Stadnyk Yu.V. , Romaka V.V.
Published: March 2018

The features of structural, energy state and electrokinetic characteristics were investigated for Hf1‑xTmxNiSn solid solution in the range: T = 80 - 400 K, x = 0 - 0.40. It was confirmed partly disorder crystal structure of HfNiSn compound as a result of occupation in the 4a crystallographic site of Hf (5d26s2) atoms by Ni (3d84s2) ones up to ~ 1 % that generates in the crystal structural defects of donor nature. It was shown that introduction of Tm atoms ordered crystal structure (“healing” of structural defects). It was established mechanisms of simultaneous generation of structural defects as acceptors by substitution of Hf (5d26s2) by Tm (4f135d06s2) atoms, and the donor nature defects as a result of the appearance of vacancies in the Sn (4b) atoms sites, which determines the mechanisms of conductivity for Hf1-xTmxNiSn.
Methods of Synthesis of Nanodispersed Iron Fluoride as the Cathode Materials for Lithium-Ion Battery
Authors: Moklyak V. V. , Zbihley L. Z.
Published: March 2018

The paper deals with the analysis and classification of the modern methods of synthesis nanostructure iron fluoride and their composites with improved performance, and also the results of testing iron fluoride in lithium-ion battery. Literature data are generalized to select the most universal methods of synthesis anhydrous iron fluoride for revealing the relationship between the conditions of synthesis and structural, magnetic and morphological properties of nanosystems, and thus opens possibilities for functional materials with predetermined, adapted for use in a particular area properties.
Electrochemical Properties of Polyaniline in Aqueous Environments of Iodide and Bromide in the System of Electrochemical Energy Source
Authors: Bakhmatyuk B.P. , Аksimentyeva О.І. , Dupliak І.Ya. , Horbenko Yu.Yu.
Published: March 2018

The influence on specific discharge characteristics of redox - active iodide and bromide electrolytes of polyaniline as the cathode material in electrochemical energy sources with zinc anode was studied. Electrochemical and capacitive properties of PAN cathode was investigated using galvanostatic, potentiostatic, cyclic voltampermetric and impedance methods. It was established that PAN cathode inherent discharge specific capacity of Ср = 126 A × h × kg-1 with current load і = 103 A × kg-1 in zinc - sulfate electrolyte and Ср = 301 A × h × kg-1 in the same conditions in the presence of KI. Thus there is a reverse transition of various forms of PAN leucoemeraldine / emeraldine, that among the redox electrolyte causes increase in electrical capacitance and conductivity of PAN electrodes in the charged state.
Chemical Treatment of CdTe and Solid Solution ZnxCd1-xTe and Cd0,2Hg0,8Te and Aqueous Solutions of HNO3–НІ-Lactate Acid
Authors: Hvozdiyevskyy E.E. , Tomashik Z.F. , Tomashyk V.M. , Denysyuk R.O.
Published: March 2018

The method of disk rotating kinetics of dissolution processes CdTe, ZnxCd1-xTe and Cd0,2Hg0,8Te in yodvydilyayuchyh etching compositions HNO3-NO-lactate acid. The dependence of etching rate of said material concentration oxidizer and organic solvent. Optimized polishing compositions herbalists and modes chemical dynamic polishing of semiconductor materials studied. The influence of Zn and Hg content in the composition of solid solutions on the quality of the resulting surface etching mixtures.
Design and Simulation Elements of Analytical Microsystem-on-Chip With the Structures "Silicon-on-Insulator"
Authors: Dovgiy V.V. , Kohut I.T. , Golota V.I.
Published: March 2018

In this paper the results of architecture development, layout designof analytical microsystem-on-chip with the structures "silicon-on-insulator" (SOI) and its elements schemotechnical computer simulation for determine their electrical and time characteristics are presented.
Design and Technology Analysis Bipolar Transistors Based on High Performance Structures AlGaAs / GaAs Structures for Submicron LargeIntegrated Circuits
Authors: Novosyadlyj S.P. , Boyko S.I.
Published: March 2018

This paper analyzes performance of bipolar transistors based on AlGaAs/GaAs heterostructures (HBT). Use of heterojunction as emitter junction allows radical improvement of its performance. Numerical simulation of HBT in ring oscillator mode showed that the delay of the BT with 1x2 µm emitter can be reduced to 8 ps at a maximum current of 105 A/cm2. HBT with one and two (emitter and collector) heterojunctions showed 24 ps delay at 9.1 mW and 17 ps at 40 mW.
Peculiarities in WC and W2C Eutectic Phases Dissolution in Interfacial Zones of Composites
Authors: Sukhova О.V. , Syrovatkо Yu.V.
Published: March 2018

The structural and phase composition of dissolution-and-diffusion interfacial zones at the particle-matrix interfaces of the composites reinforced with W–C particles infiltrated by a molten iron-base binder has been investigated. The peculiarities in the filler’s phases dissolution during infiltration have been explained within the framework of computed model allowing the estimation of an average atom oscillation frequency of the investigated phases.
The Density of MoSi2 Electron States for the Amorphous Film
Authors: Stetsun A.I.
Published: March 2018

The density of MoSi2 electron states for the amorphous film has been calculated.  An electron states at the top of valence band for this material are provided d electrons of molybdenum, p electrons of silicon and p electrons of molybdenum.  d electrons of molybdenum are significant especially for physical properties of MoSi2.
Incorporation of Nanoparticles into Inorganic Salt Crystals (review)
Authors: Vorontsov D. , Khalavka Yu. , Okrepka G.
Published: March 2018

This article provides an overview of the literature data on the incorporation of nanoparticles into crystals of inorganic salts, particularly alkali metal halides, potassium dihydrogen phosphate and others. The description of methods of obtaining composite crystals salt:nanoparticles, their properties and practical application are overviewed. It is shown that the process of incorporation of nanoparticles into the matrix depends on many factors, so systematic study of the effect of various parameters on its course and efficiency remains actual problem.
The Electrodeposition of Nickel Coatings, Modified Ultrafine Diamonds
Authors: Zabludovsky V.A. , Tytarenko V.V.
Published: March 2018

The polarization analysis of nickelwhen the concentration of ultrafine particles of diamond (UFD) in the electrolyte solution and its frequency mixing. It was found that the addition of nanodiamond particles in an aqueous electrolyte solution causes a shift reduction potential nickel electronegative region, increase resistance to charge transfer and the formation of a fine-grained, close-packed surfaces that determined the increase of microhardness and wear resistance of the metal coating.
Influence of Plasticizers on the Stress State of Epoxy Composites
Authors: Sirenko H.O. , Mandzyuk I.A. , Martynyuk M.I. , Soltys L.M.
Published: March 2018

The results of researches of influence of plasticizers and fillers on the stress state of epoxy composites during solidification and thermal shocks have been shown. It has been observed the influence of plasticizers based on tricresyl phosphate, dibutyl phthalate, triethanol amine, polynaphthyl methane, mineral and castor oils, monoglycidyl ethers oxydiarylmethane, adducts based on them and polyethylene polyamine and copper complex of this adduct and fillers: quartz sand, molybdenum disulfide, bentonite and mica on deformation and stress state of epoxy resin. Minimum deformation and stress state has epoxy composites with plasticizers based on monoglycidyl ethers oxydiarylmethane, adducts based on them and polyethylene polyamine and copper complex of this adduct and fillers – molybdenum disulphide and bentonite.
Fractal Dimension and Parameters of the Grunasena Polymer Systems with Negative Poissonratio
Authors: Shevchuk T.N. , Bordjuk N.A.
Published: March 2018

Based on the principles of fractal approach and synergy of structure formation processes modeled in polymer ausketykah based on thermoplastic polyurethane filled with powder of iron (Fe), molybdenum (Mo) and tungsten (W). Within the cluster model filled polymers shown that clusters and mizhklasterni area is nanoutvorenyamy.To study defined lattice of acoustic parameters of the Grunasena. Modeled filled polymer such systems, using fractal dimensions determined by the dimensions of boundary layers.
Electrophysical Properties of Nanocomposites on the Basis of Polychlorotrifluoroethylene and Magnesium Oxide Modified with Copper Iodide
Authors: Mazurenko R.V. , Gorbik P.P. , Gunya G.M. , Makhno S.N.
Published: March 2018

Досліджено електрофізичні властивості в надвисокочастотному діапазоні та на низьких частотах композитів на основі хімічно модифікованого йодидом міді високодисперсного оксиду магнію та поліхлортрифторетилена в інтервалі температур 25 - 170оС і концентрацій CuI від 0 до 0,80 об’ємних часток. Встановлено оптимальний об’ємний вміст йодиду міді (~ 0,75) в композитах CuI/MgO, при якому міжфазна взаємодія проявляється найбільш інтенсивно, а електрофізичні параметри набувають максимальних значень. Показано, що полімерні композити, до складу яких входить CuI/MgO, мають вищі значення дійсної та уявної складових комплексної діелектричної проникності та електропровідності в порівнянні з системою, яка не містить модифіковані компоненти.
Aggregation Features of Monodisperse Palladium Nanoparticles Supported on g-Al2O3
Authors: Kalishyn Ye.Yu. , Bychko I.B. , Kaidanovych Z.V. , Trypolskyi A.I. , Strizhak P.E. , Ordynskyi V.V.
Published: March 2018

The production of supported on γ-A12O3 palladium catalysts by colloidal solution deposition method have been improved. Influence of temperature on the structure and dispersion characteristics of supported nanosized palladium particles during catalyst preparation and activation was investigated. It has been shown that at temperatures below 300oC monodisperse particles palladium catalysts are stable. Further temperature increase leads to aggregation of monodisperse metal nanoparticles by the mechanism of reaction-limited aggregation (RLA) to form polydisperse system.
Optical Absorption and Piezoelectric Effect Investigation in Single Crystal of AgGaGe3Se7.6Te0.4 Solid Solution
Authors: Krymus A.S. , Kityk I.V. , Parasyuk O.V. , Myronchuk G.L.
Published: March 2018

In present work spectral distribution of absorption coefficient in the range of 100 – 300 K was investigated and band gap values  evaluated. Parameters of Urbach rule were calculated and linearity  of temperature dependence of Urbach energy was showed. Thermo induced piezoelectric effect in a range of 297 ‑ 357 K was investigated. Laser induced kinetics of piezomodule was investigated and absence of irreversible changes was showed. Influence of heating the crystal during laser illuminating on piezoelectric module was adjusted.
The Influence of Chemical Modificate of Surface of Titanium Phosphate on its Ability to Sorb Strontium Ions From Aqueous Solutions
Authors: Vasylyeva H. , Tsyba M. , Kylivnyk Yu. , Yakovlev V.
Published: March 2018

The influence of chemical modificate of surface of titanium phosphate on its ability to sorb of strontium ions from aqueous solutions was investigated. The samples of titanium phosphate were modificated by NH4OH solution and irradiate by Bremsstrahlung gamma rays. It was shown, that phosphate titanium’s ability to sorb of strontium ions from aqueous solutions is increasing after modificated.
Features of Structural, Energy and Kinetic Characteristics of Hf1-xErxNiSn Solid Solution
Authors: Romaka L.P. , Rogl P.-F. , Нoryn A.M. , Romaka V.V. , Krayovskyy V.Ya. , Stadnyk Yu.V.
Published: March 2018

1-xErxNiSn solid solution in the range: T = 80 – 400 K, x = 0 - 0.10. It was confirmed partly disorder crystal structure of HfNiSn compound as a result of occupation in the 4a crystallographic site of Hf (5d26s2) atoms by Ni (3d84s2) ones up to ~ 1 % that generates in the crystal structural defects of donor nature. It was shown that introduction of Er atoms ordered crystal structure (“healing” of structural defects). It was established mechanisms of simultaneous generation of structural defects as acceptors by substitution of Hf (5d26s2) by Er (4f125d06s2) atoms, and the donor nature defects as a result of the appearance of vacancies in the Sn (4b) atoms sites, which determines the mechanisms of conductivity for Hf1-xErxNiSn.
Effect of laser irradiation on Electrochemical Properties of composite MoS2/C
Authors: Yablon L.S. , Morushko O.V. , Ostafiychuk B.K. , Budzulyak І.М. , Khemiy О.M.
Published: March 2018

The paper presents the results of studies of electrochemical properties of composite MoS2/C. It is shown that the contribution to the conductivity of composites makes a charge accumulation capacitive nature inherent in high-conductive carbon, which is situated between the layers of MoS2, improved charge transfer processes during charge / discharge, and quick turnaround faradeyivski processes inherent molybdenum disulphide. Found that the highest discharge specific capacity has laser irradiated composite MoS2/C with a carbon content of 70% (209 F/g), due to the best combination of two mechanisms of charge accumulation and activation of charge carriers under the influence of laser.
The Influence of Silver Nanoparticles on Absorption Spectra and Structure of thin Poly(ortho-toluidine) Films
Authors: Konopelnyk O.I. o , Aksimentyeva O.I. , Horbenko Yu.Yu. , Savytsky N.S.
Published: March 2018

Poly(ortho-toluidine) (PoTI) films of different thicknesses were obtained by electrochemical polymerization on the SnO2 surface and doped with silver nanoparticles, synthesized by citrate method. It was established that doping by nanosilver causes significant changes in optical absorption of films in the wavelength range λ = 310-450 nm and λ = 550 - 1000 nm. In comparison with the undoped PoTI there is decrease in the intensity and half-width strip of π-π * transition with maximum at λ = 370 nm, the appearance of the absorption band with a maximum at λ = 612 nm and leveling broad bipolaron band at λ = 800 - 950 nm. The observed changes can be explained by the interaction of silver nanoparticles with conjugated polymer chain which is confirmed by research of structure of PoTI films doped with nanosilver.
Crystalquasichemical Description the Formation of Defects in nanodispersed Yttrium-Iron Garnet
Authors: Fedoriv V.D. , Turovska L.V. , Yaremiy I.P. , Stashko N.V.
Published: March 2018

By the sol-gel method of autocombustionan initial oxide system was synthesized for a receipt a nanodispersed Yttrium Iron Garnet. It was set that forming of the monophase system Y3Fe5O12 begins at temperatures above 973 К in static air atmosphere. The crystalquasichemical formulas for Y3Fe5O12 are offered. Dependence of concentration of defects from a degree non-stoichiometry of oxygen is calculated. It was set that the formation of garnet structure needed oxygen atmosphere annealing. Partial pressure of oxygen determines the resulting structure defects.
Chemical Polishig of CdTe and Solid Solution ZnxCd1-xTe and Cd0.2Hg0.8Te by the HNO3 – НІ – Glycerin Acid Aqueous Solutions
Authors: Hvozdiyevskyi E.E. , Denysyuk R.O. , Tomashyk V.M. , Tomashyk Z.F.
Published: March 2018

The chemical dissolution of the CdTe, ZnxCd1-xTe and Cd0,2Hg0,8 solid solutions single crystals in the HNO3 – HI – glycerin aqueous solutions has been investigated. The etching rate dependences of the mentioned above materials versus the iodine and organic content in the compositions and the kinetic peculiarities of the chemical dissolution have been determined. It was established that the dissolution rate of the semiconductor solid solutions in the HNO3 – HI – glycerin etchant compositions decreases with the increasing of oxidizer and glycerin. Using experimental data, the compositions of polishing solutions and the conditions of chemical-dynamic polishing of the CdTe, ZnxCd1-xTe and Cd0,2Hg0,8Te surfaces have been optimized.
The Kinetic Peculiarities of the Nanocrystallization of Amorphous Alloys Fe84Nb2B14, which are Doped by Rare Earth Metals
Authors: Boichyshyn L. , Danyliak M.-O. , Kotur B. , Mika T.
Published: March 2018

The thermal stability and crystallization of the Fe82Nb2B14RE2 (RE = Y, Gd, Tb, Dy) amorphous alloys were investigated by differential scanning calorimetric (DSC) method. By X-ray diffraction (XRD) method has been established that the initial AMA have amorphous structure. The RE alloying of Fe82Nb2B14RE2 amorphous alloys increase the nanocrystallization temperatures for ~ 110 K and activation energies of crystallization for ~ 330 kJ/mol. The Avrami constant was found to be 1.86 for Fe84Nb2B14 at 703 K, 1.17 for Fe82Nb2B14Y2 at 813 K, 1.36 for Fe82Nb2B14Gd2 at 808 K, 1.76 for Fe82Nb2B14Tb2 at 808 K and 1.92 for Fe82Nb2B14Dy2  at 808 K. Two-dimensional diffusion controlled growth mechanism with decreasing nucleation rate was observed in the alloys.
Investigation of Changes in Resistivity of n-Si with Temperature and Uniaxial Stress
Authors: Gaidar G.P.
Published: March 2018

In this work the changes in resistivity of n‑Si with temperature and uniaxial stress X, oriented both in <100> and in [111] direction, were investigated. The value of the anisotropy parameter of mobility was obtained in the conditions of  J || X || [100] and  J ┴ X || [100] with using the experimental data concerning longitudinal and transverse tenso-resistance. The presence of the n-Si tenso-resistance was found in the conditions of  X || J ||[111], i.e., in the absence of the interminimum redistribution of charge carriers. The physical explanation of the results was presented.
Features of Structural, Electrokinetic, and Energy State Characteristics of ZrNiSn1-xGax Solid Solution
Authors: Romaka L.P. , Нoryn A.M. , Stadnyk Yu.V. , Krayovskyy V.Ya. , Romaka V.A. , Rykavets Z.M. , Rogl P.-F.
Published: March 2018

Features of structural, electrokinetic, and energy state characteristics of ZrNiSn1-xGax semiconductive solid solution were investigated in the temperature ranges Т = 80 - 400 K and х = 0 - 0.15. Disorder of crystal structure for n-ZrNiSn compound as a result of occupation of Zr (4d25s2) atoms in 4a sites by Ni (3d84s2) ones up to ~ 1 % was confirmed. It generated donor levels band ɛD1 in the band gap. It was shown that introduction of Ga (4s24p1) atoms by means of substitution of Sn (5s25p2) ones ordered crystal structure. In this case acceptor defects were generated in 4b sites and it created extended acceptor impurity band ɛА. It was suggested that with generation of acceptor structural defects the vacancies in the Sn (4b) atomic sites simultaneously generated donor defects and formed deep donor band ɛD2 (donor-acceptor pair took place).
The Physical and Thermodynamic Functions of Borides
Authors: Filonenko N.Yu.
Published: March 2018

In the paper the physical properties and thermodynamic functions of borides Х2В (Х=W, Mo, Mn, Fe, Co, Ni та Cr) are studied with accounting for fluctuation processes. We use the microstructure analysis, the X-ray structural and the durometric analyses to determine the physical properties of alloys. In the paper it is determined the phase composition and physical properties of borides. In this paper for the first time it is determined the thermodynamic functions of borides using the Hillert and Staffansson model with accounting for the first degree approximation of high-temperature expansion for the free energy potential of binary alloys. We obtain the temperature dependences for such thermodynamic functions as Gibbs free energy, entropy, enthalpy and heat capacity Ср along with their values at the formation temperature for Х2В (Х=W, Mo, Mn, Fe, Co, Ni та Cr). The approach under consideration enables to give more thorough from the thermodynamic point of view description of borides formed from the liquid. The outcomes of the thermodynamic function calculation for borides are in good agreement with experimental data and results of other authors.
Synthesis and Electrical Properties of Ag8SnSe6 Argyrodite Thin Films
Authors: Semkiv I.V. , Ukrainets N.A. , Kusnezh V.V. , Zmiiovska E.O. , Petrus R.Yu. , Ilchuk H.A. , Dubiv T.O.
Published: March 2018

The synthesis of Ag8SnSe6 argyrodite thin films with thickness 500 nm by selenization of Ag-Sn film at 480 oC was carried out. Thin films were investigated by X-ray diffraction. Ternary Ag8SnSe6 synthesized in orthorhombic structure with the lattice parameters a = 7.9081(6) Å, b = 7.8189(7) Å, c = 11.0464(9) Å, V = 683.03(10) Å3. Resistive switching cell based on Ag8SnSe6 argyrodite with silver and graphite electrodes was fabricated. Electrical properties of cell were investigated using impedance spectroscopy and cyclic voltammetry. Cell structure and process in this cell were modeled by electric equvivalent circuit. Resistive switching phenomena in Ag/Ag8SnSe6/C cell at certain applied voltage were demonstrated.
Coefficient of Interband Light Absorption by InAs/GaхIn1-хAs Quantum Dot Superlattice at Low Temperatures
Authors: Boichuk V.I. , Bilynsky I.V. , Pazyuk R.I.
Published: March 2018

In the paper the InAs/GaxIn1-xAs superlattice system of small size cubic QDs (10 nm) has been considered. Dispersion relations for electron and hole subbands have been calculated for superlattices of different dimensionality. The dependences of the interband absorption coefficient on light frequency, quantum dot size and interdot distance have been researched.It is shown, that the dimension of the superlattice has influence on the shape of the absorption bands and the increasingof the distance between quantum dots is followed by narrowing of the absorption peaks for all three superlatticetypes.
Effect of Microwave Radiation on the Band Structure and Electronic Parameters of the Heterosystems with Fullerenes
Authors: Matveeva L.O. , Venger E.F. , Konakova R.V. , Kolyadina O.Yu. , Neluba P.L. , Shynkarenko V.V.
Published: March 2018

The results of a complex study of C60/Si heterosystems are presented in this work: the crystal structure and composition of the films, internal mechanical stresses, electronic parameters of the film and the film-substrate interface, and the effect of external influences (ultraviolet irradiation, thermal annealing, gamma and microwave irradiation). The advantage of microwave treatment over others is established: the absence of fullerene decomposition, the removal of internal mechanical stresses in the heterosystem, and the improvement of its electronic parameters. Methods for remove the decomposition of C60 molecules under the influence of other treatments have been developed. To eliminate the interaction of fullerenes with oxygen, it was proposed to perform thermal annealing and UV irradiation in vacuum, and in the case of g-irradiation, apply a protective coating on the surface of the film (GeOx or SiOx). In solar cells with C6 films in the polymer matrix on Si, a significant advantage of titanium contacts in comparison with gold is established, especially after microwave treatment. Contact resistance decreased as a result of hybridization of 3d-orbitals of titanium and 2p-orbitals of fullerenes with the formation of ТіхС60 carbides and radiation-stimulated diffusion of metals, which increases the contact area.
The Changes of Structure and Electrical Properties of Thin Films During Long-Term Aging
Authors: Yatsyshyn B.P. , Domantsevych N.I.
Published: March 2018

The changes of surface structure and electrical properties of crystalline thin films of ternary compounds (La, Y, Sc)-(Ni, Fe)-Ge with metal content not more than 50 at. percent, which are obtained by vacuum deposition, are investigated. The directions of growth defects of films in aging over 20 years shown also as the influence of aging on the electrical properties of the condensates are analyzed.