Elemental and phase analysis of nanocomposite coatings on basis Ti-Hf-Si-N system received by the vacuum-arc deposition method

Coatings on the basis Ti-Hf-Si-N system were synthesized by vacuum-arc deposition method from the uniflow and separated ion-plasma flow. The morphology, elemental and phase composition of coatings were investigated. The dependence of the characteristics of the coating from the physical and technological parameters of deposition was installed. The two-phase structure of the coating: a substitutional solution (Ti, Hf)N and quasiamorphous silikonitrid α-Si₃N₄ was determined. The factors that determine the compressive stresses in the coatings were considered.Методом вакуумно-дугового осаждения из прямоточного и сепарированного ионно-плазменного потока синтезированы покрытия на основе системы Ti-Hf-Si-N. Исследована морфология, определен элементный и фазовый состав покрытий. Установлена зависимость характеристик покрытий от физико-технологических параметров осаждения. Определена двухфазная структура покрытия: твердый раствор замещения (Ti, Hf)N и квазиаморфный силиконитрид α-Si₃N₄. Рассмотрены факторы, определяющие сжимающие напряжения в покрытиях.Методом вакуумно-дугового осадження з прямоточного і сепарованого іонно-плазмового потоку синтезовані покриття на основі системи Ti-Hf-Si-N. Досліджено морфологію, визначено елементний і фазовий склад покриттів. Встановлено залежність характеристик покриттів від фізико-технологічних параметрів осадження. Визначена двофазна структура покриття: твердий розчин заміщення (Ti, Hf) N і квазіаморфний силіконітрид α-Si₃N₄. Розглянуто чинники, що визначають стискаючі напруження у покриттях

Influence of thermal annealing and deposition conditions on structure and physical-mechanical properties of multilayered nanosized TiN/ZrN coatings

Nanostructured multilayered TiN/ZrN coatings were fabricated using vacuum-arc deposition method. Amount of layers was 134-533; average bilayer thickness was 20-125 nm depending on deposition conditions. Good planarity of nanoscale bilayers were observed. Regularities of phase-structure changes in surface layers under the influence of aggressive oxygen atmosphere and high temperature (700С) annealing were established as a model of critical working conditions. Bilayer thickness influence on hardness was explored. Maximum hardness was 42 GPa

Influence of thermal annealing and deposition conditions on structure and physical-mechanical properties of multilayered nanosized TiN/ZrN coatings

Nanostructured multilayered TiN/ZrN coatings were fabricated using vacuum-arc deposition method. Amount of layers was 134-533; average bilayer thickness was 20-125 nm depending on deposition conditions. Good planarity of nanoscale bilayers were observed. Regularities of phase-structure changes in surface layers under the influence of aggressive oxygen atmosphere and high temperature (700С) annealing were established as a model of critical working conditions. Bilayer thickness influence on hardness was explored. Maximum hardness was 42 GPa

Formation of Superhard Nanostructured Ti–Hf–N(Fe) Coatings Obtained by Vacuum Arc Deposition in HF discharge

Superhard nanostructured Ti–Hf–N(Fe) coatings are prepared. The formation of local regions of (Ti, Hf)N, FeN, and Hf is detected using μ-PIXE (ion microbeam). It is revealed that the synthesized coatings have a nanohardness of 48 ± 1 GPa and are composed of nanograins with a size of 4.8–10.6 nm, which are enveloped by finer entities of other phases (Ti, Fe)N and FeN. There is a good correlation between the results derived by XRD, TEM, AFM, and SEM and microanalysis, which in turn are complemented by the analysis results obtained using an ion microbeam and PIXE. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3492

Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results

Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC

Measurements of inclusive jet suppression in heavy ion collisions at the LHC provide direct sensitivity to the physics of jet quenching. In a sample of lead-lead collisions at sqrt(s) = 2.76 TeV corresponding to an integrated luminosity of approximately 7 inverse microbarns, ATLAS has measured jets with a calorimeter over the pseudorapidity interval |eta| < 2.1 and over the transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the anti-kt algorithm with values for the distance parameter that determines the nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of the jet yield is characterized by the jet "central-to-peripheral ratio," Rcp. Jet production is found to be suppressed by approximately a factor of two in the 10% most central collisions relative to peripheral collisions. Rcp varies smoothly with centrality as characterized by the number of participating nucleons. The observed suppression is only weakly dependent on jet radius and transverse momentum. These results provide the first direct measurement of inclusive jet suppression in heavy ion collisions and complement previous measurements of dijet transverse energy imbalance at the LHC.Comment: 15 pages plus author list (30 pages total), 8 figures, 2 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-02

Measurement of event-shape observables in Z→ℓ+ℓ− events in pp collisions at √ s=7 TeV with the ATLAS detector at the LHC

Event-shape observables measured using charged particles in inclusive $Z$-boson events are presented, using the electron and muon decay modes of the $Z$ bosons. The measurements are based on an integrated luminosity of $1.1 {\rm fb}^{-1}$ of proton--proton collisions recorded by the ATLAS detector at the LHC at a centre-of-mass energy $\sqrt{s}=7$ TeV. Charged-particle distributions, excluding the lepton--antilepton pair from the $Z$-boson decay, are measured in different ranges of transverse momentum of the $Z$ boson. Distributions include multiplicity, scalar sum of transverse momenta, beam thrust, transverse thrust, spherocity, and $\mathcal{F}$-parameter, which are in particular sensitive to properties of the underlying event at small values of the $Z$-boson transverse momentum. The Sherpa event generator shows larger deviations from the measured observables than Pythia8 and Herwig7. Typically, all three Monte Carlo generators provide predictions that are in better agreement with the data at high $Z$-boson transverse momenta than at low $Z$-boson transverse momenta and for the observables that are less sensitive to the number of charged particles in the event.Comment: 36 pages plus author list + cover page (54 pages total), 14 figures, 4 tables, submitted to EPJC, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2014-0

Inactivation of cGMP-dependent conductance of rod outer segment plasma membrane induced bij cGMP

AbstractIntegral cGMP-dependent currents as well as activity of single cGMP-activated channels in plasma membrane of rod outer segment (ROS) were recorded using the patch-clamp method. The dependence of integral currents on cGMP concentration is shown to be bell-shaped. Decrease in cGMP-dependent conductance at high cGMP concentration results from a decrease in channel opening probability. Thus, cGMP in high concentrations inactivates cGMP-dependent conductance

Pharmacological pain management in chronic pancreatitis

Contains fulltext : 125762.pdf (publisher's version ) (Open Access)Intense abdominal pain is a prominent feature of chronic pancreatitis and its treatment remains a major clinical challenge. Basic studies of pancreatic nerves and experimental human pain research have provided evidence that pain processing is abnormal in these patients and in many cases resembles that seen in neuropathic and chronic pain disorders. An important ultimate outcome of such aberrant pain processing is that once the disease has advanced and the pathophysiological processes are firmly established, the generation of pain can become self-perpetuating and independent of the initial peripheral nociceptive drive. Consequently, the management of pain by traditional methods based on nociceptive deafferentation (e.g., surgery and visceral nerve blockade) becomes difficult and often ineffective. This novel and improved understanding of pain aetiology requires a paradigm shift in pain management of chronic pancreatitis. Modern mechanism based pain treatments taking into account altered pain processing are likely to increasingly replace invasive therapies targeting the nociceptive source, which should be reserved for special and carefully selected cases. In this review, we offer an overview of the current available pharmacological options for pain management in chronic pancreatitis. In addition, future options for pain management are discussed with special emphasis on personalized pain medicine and multidisciplinarity