bluuebunny/crossref_metadata_2025 huggingface dataset:
Critical phenomena in 1D Ising model with arbitrary spin
Authors: Proshkin Alexey , Kassan-Ogly Felix , Zarubin Alexander , Ponomareva Tatyana , Menshikh Ivan
Published: July 2018

The aim of this work was to study critical phenomena taking place in 1D Ising model with different exchange interactions signs and arbitrary spin values in a magnetic field. Exact analytical formulas for frustration fields, zero temperature magnetization and entropy at these fields are obtained. The general behavior of pair spin correlation function with the accounting of only interactions between nearest neighbors is examined.
Magnetization curves and hysteresis loops of nanostructured rare earth titanates
Authors: Rinkevich Anatoly B. , Korolev Alexander V. , Samoilovich Mikhail I. , Demokritov Sergej O. , Perov Dmitry V.
Published: July 2018

Magnetic properties of the nanocomposite materials containing particles of rare earth titanates with pyrochlore structure have been investigated. For the nanocomposites with Gd2Ti2O7, La2Ti2O7 it has been observed that the effective magnetic moment in the nanocomposites differs substantially from that for Gd3+ and La3+ ions. The hysteresis loops was obtained for the nanocomposites with Dy3+, Gd3+, Yb3+, Er+, Sm3+ ions. There is no hysteresis loops for the nanocomposites with La2Ti2O7, Pr2Ti2O7 and Nd2Ti2O7 particles. It has been shown that nanocomposites with Yb2Ti2O7, Dy2Ti2O7 and Er2Ti2O7 particles have one crossing point on the descending branches of hysteresis loop in some temperature range.
Appearance of itinerant electrons detected by IR spectroscopy and its correlation with surface magnetism in Co-doped TiO2 nanopowders
Authors: Mostovshchikova E.V. , Yermakov A.Ye. , Uimin M.A. , Minin A.S.
Published: July 2018

IR absorption and magnetic data for the titanium dioxide nanopowders are studied. Additional absorption in IR range is revealed in nanocrystalline TiO2 and Co-doped TiO2 after reducing annealing and explained by appearance of the oxygen vacancies and delocalised charge carriers. Increasing of the absorption in IR range after annealing of Co-doped TiO2 in vacuum (or decreasing of this contribution after annealing in air) correlates with arising (or vanishing) of ferromagnetic contribution.
Phase Dynamics in Arrays of Coupled Vortex Spin-Torque Nano-Oscillators
Authors: Katkova Olga , Safin Ansar , Udalov Nikolay , Kapranov Mikhail
Published: July 2018

In this work, the mode analysis technique of complex networks nonlinear selfoscillatory vortex-based spin-torque nano-oscillattors (STNOs) with nonidentity and nonisochrony is developed. We construct adjacency matrices of different type of networks and calculate the normal modes. After the calculation of normal modes we shift to truncated equations for slowly varying amplitudes and phases in the normal coordinates using generalized quasi-Hamiltonian approach. Finally, we present the phase dynamics based on the Kuramotoapproach and compare different networks to the ability of synchronization.
On Nature of the Induced Anisotropy in the Chemically Deposited Со‒Р Films
Authors: Chzhan Anatoly V. , Podorozhnyak Sergey A. , Volochaev Mikhail N. , Patrin Gennady S.
Published: July 2018

The induced magnetic anisotropy in the Со‒Рfilms prepared by chemical deposition from liquid solutions in a magnetic field has been investigated. The pronounced difference between the anisotropy values and relaxation times points out the existence of different physical mechanisms responsible for the occurrence of anisotropy of the Со‒Р films at low and high pH values. Possible mechanisms of the induced anisotropy in the Со‒Р films prepared at different pH values are discussed.
Magneto-Optical Response Amplification In Multi-Layer Nanocomposite-Semiconductor Structures
Authors: Buravtsova Victoria , Gan’shina Elena , Kalinin Yuri , Sitnikov Alexander
Published: July 2018

The spectral and field dependences of the Transversal Kerr Effect (TKE) for (Co40Fe40B20)Z(SiO2)100-Z/Si (or С) multilayer (ML) nanocomposite-semiconductor structures were studied depending on the concentration of the nanocomposite layer ferromagnetic phase (Z), chemical of semiconductor layer and its thickness. It was found that under certain conditions an addition of thin nonmagnetic semiconductor layer leads to the increase of a multilayer magneto-optical (MO) response and softening of the magnetic properties of ML structure, up to the appearance of ferromagnetic (FM) ordering. The observed anomalous changes in magnetic and MO properties are well correlated with abrupt changes in the electric properties of ML structures. Decreasing of ferromagnetic phase concentration Z in the nanocomposite layer as well as increasing of the semiconductor layer thickness led to the disappearance of anomalous behavior in the MO properties. The results obtained are discussed taking into account the formation of a new magnetic phase on the FM granule-semiconductor interface.
Magnetic properties of poly(p-xylylene)-Ni nanocomposites
Authors: Vdovichenko Artem , Streltsov Dmitry , Orekhov Anton , Vasiliev Alexander , Zubavichus Yan , Grigoriev Evgenii , Zavyalov Sergei , Oveshnikov Leonid , Chvalun Sergei
Published: July 2018

The dependence of electrical and magnetic properties on structure of thin poly(p-xylylene) - nickel nanocomposite films with Ni concentrations from 5 to 30 vol.% was studied. It was found that metal concentration strongly affects size and oxidation state of the nanoparticles. Effect of the filler content on electrical and magnetic properties of the nanocomposites was revealed. These properties are determined by percolation phenomenon, with the percolation threshold value of about 10 vol.%. The well pronounced magnetic hysteresis as well as ferromagnetic ordering were observed at Ni content above the percolation threshold. The diagrams of magnetic properties of these composites as a function of composition and temperature were elaborated.
Magnetic properties of the natural and isotope-modified diamond and silicon carbide
Authors: Taldenkov A.N. , Inyushkin A.V. , Chistotina E.A. , Ralchenko V.G. , Bolshakov A.P. , Mokhov E.N.
Published: July 2018

The magnetic properties of single crystals of synthetic diamond and crystals of silicon carbide were studied. High-purity samples of diamonds synthesized with HPHT and CVD technologies were used. The crystals of silicon carbide were grown by sublimation and industrial technology. Along with samples with a natural isotopic composition, monoisotopic crystals of diamond (99.96% 12C and 99.96% 13C) and silicon carbide (99.993% of 28Si) were studied. On the basis of the data obtained, the diamagnetic susceptibility was determined and the concentration of paramagnetic centers and the content of the ferromagnetic component were evaluated. The results are discussed.
Effects of spin polarization on resonant photoemission from d-f states in TbNi2Mnx compounds
Authors: Grebennikov Vladimir I. , Kuznetsova Tatyana V. , Gerasimov Evgenii.G. , Mushnikov Nikolai.V.
Published: July 2018

Resonant photoemission in narrow-band materials is described by the sum of first-and secondorder transitions, their quantum-mechanical interference leads to an increase in the spectrum from the valence bands and the appearance of an asymmetric dependence on the photon energy. These effects are studied theoretically and experimentally using the example of three-component intermetallic compounds TbNi2Mnx. The competition between the elastic and inelastic photoemission channels leads to a different dependence of photoemission spectra from nickel and manganese on photon energy. The elastic channel is realized on atoms with large magnetic moments, the inelastic Auger decay occurs on atoms with small moments.
THE INVESTIGATION OF CRYSTAL AND MAGNETIC STRUCTURES OF SOLID SOLUTIONS BaFe12-xDxO19 (D= In AND Ga; x= 0.1 – 1.2)
Authors: Turchenko Vitalii , Trukhanov Alex V. , Trukhanov Sergei V. , Kazakevich I.S.
Published: July 2018

The influence of partially substituted of barium ferrites by diamagnetic In and Ga ions with neutron diffraction method was studied. The substitution of Fe by In ions leads to increase of volume of unit cell while replacing with Ga ions insignificantly change the lattice parameters. The concentration dependence of the Tc Curie temperature as well as the magnetization is constructed. The refinement of the magnetic structure was carried out within the framework of Gorter’s model. The microstructural parameters of solid solutions BaFe12-xDxO19 (D= In and Ga; x = 0.1–1.2) were determined by the high-resolution neutron diffraction method.
Ab initio study of magnetic and structural properties of Fe-Ga alloys
Authors: Matyunina Mariya , Zagrebin Mikhail , Sokolovskiy Vladimir , Buchelnikov Vasiliy
Published: July 2018

The structural and magnetic properties for a series of Fe100-xGax alloys (x = 18 – 30 at.%) are studied in the framework of first-principles calculations and Monte Carlo simulations. The both, general gradient approximation and local density approximation are considered for the exchange-correlation functional. The ground state ab initio calculations are performed for both D03 and L12 crystal structures. It is shown that for general gradient approximation, the optimized lattice parameters and total magnetic moments are found in the better agreement with experimental ones. Using the calculated exchange coupling constants for studied compositions, Curie temperatures are estimated by means of Monte Carlo simulations of Heisenberg Hamiltonian.
Giant forced magnetostriction in Tb0.2Gd0.8 single crystal
Authors: Nikitin Sergey , Ivanova Tatiana , Zvonov Alexey , Rogacki Krzysztof , Koshkid'ko Yurii , Ćwik Jacek
Published: July 2018

The results of investigation of the Tb0.2Gd0.8 single crystal forced magnetostriction are presented. Temperature dependences of magnetostriction have been measured from 4 to 300°K in applied magnetic fields up to 14 T. The giant field induced magnetostriction ~ 1.5•10-3 was discovered in the room temperature region in magnetic fields up to 14 T.
Competing anisotropy in the (TmxPr1-x)2Fe17 system
Authors: Platonov Sergey , Kuchin Anatoly , Volegov Alexey , Korolev Alexander , Neznakhin Dmitriy , Voronin Vladimir , Proskurnina Natal’ya , Kolodkin Denis
Published: July 2018

The magnetization curves of magnetically aligned finely powdered samples of the (TmxPr1-x)2Fe17 compounds have been measured at 4 K. The easy magnetization axis is oriented in the basal plane or along the hexagonal axis for the compounds with x = 0-0.3 and 0.7-1, respectively. This is because of the absence of magnetic ordering in the Tm and Pr subsystems in these ranges, respectively, and because of competing anisotropy of the subsystems. For the compositions with x = 0.4-0.6, both rare-earth subsystems are magnetically ordered and the easy magnetization axis is oriented between the basal plane and the hexagonal axis. The critical fields of FOMPs decrease quickly as the Pr or Tm content decreases in the ranges 0-0.3 and 0.7-1, respectively. The magnetization anisotropy also diminishes as the Tm content becomes smaller than x = 0.7. No influence of the intrinsic microdeformations on the magnetization of the compounds was detected.
Electomagnetic absorption of composites based on epoxy resin and metallic iron nanoparticles
Authors: Krekhno Roman V. , Safronov Alexander P. , Beketova Anna I. , Beketov Igor V.
Published: July 2018

The heat losses originated from the electro-magnetic absorption in magnetic epoxy-based composites with embedded metallic iron nanoparicles were studied by Calvet microcalorimetry. Iron magnetic nanoparticles (MNPs) were synthesized by electrical explosion of wire (EEW) method; they were non-agglomerated, spherical in shape and had a weight average diameter 85 nm. Composites based on the cured epoxy-dian resin contained MNPs in weight content varying from 10% up to 70% . To study the heat loss in alterating magnetic field commercial Calvet microcalorimeter was equiped by two coils in the serial connection placed in the calorimeter cells; one of the coils contained a sample of composite the other was a reference. The electromagnetic adsorption was studied in the alternating magnetic field up to 1700 A /m in 67 – 214 kHz frequency range. The measured values of the specific power losses revealed linear dependence on iron MNPs content in composite and non-linear increasing function of the field frequency.
Effect of alloying elements (Zr, Hf, Co), heat and mechanical treatment conditions on the phase composition and magnetic properties of SmFe11Ti compounds with ThMn12 structure
Authors: Urzhumtsev Andrey , Anikin Maksim , Tarasov Evgeniy , Semkin Mikhail , Cherepkov Maksim , Kudrevatykh Nikolay , Zinin Aleksandr , Moskalev Vladimir
Published: July 2018

The results of thermomagnetic, metallographic and X-ray diffraction phase analysis as well as the measurements of specific magnetization (σs), Curie temperature (TC), coercive force (HC) of (Sm,M)(Fe,M)12-xTix alloys samples, where M = Zr, Hf, Co with the ThMn12 main phase structure (1-12) are presented. The effect of the annealing temperature and the cooling rate on the formation of 1-12 phase and its magnetic properties, including the effect of high-energy milling on the magnetic hysteresis properties and alloys structure are described. It was found that the highest magnetic characteristics such as σs = 112.6 emu/g and TC = 600 ºC are attained in the (Sm0.8Zr0.2)(Fe0.75Co0.25)11.4Ti0.6 alloy after its annealing at 1050 °C and rapid cooling. It is noted that a mechanical milling of the alloy leads to 1-12 phase amorphization which accompanied by an α-(Fe) or metal Co phases impurity formation.
Study of reversibility of coercivity under heat treatment in permanent magnets
Authors: Lileev Alexey , Pinkas Victoria , Voronchihina Kristina , Gunbin Anton
Published: July 2018

This article is aimed at observation all discussion and results that have ever been found about the phenomenon of reversibility of coercivity under heat treatments in permanent magnets including the latest researches. Despite the fundamental differences in the nature of coercivity as sensitive to structure property and magnetization reversal processes all works illustrate no changes in structure under heat treatment that causes doubts about this phenomenon.
Influence of additional compounds on coercivity of sintered Nd-Fe-B magnets
Authors: Pham Thanh , Nguyen Duong , Nguyen Yen , Nguyen Lam , Dinh Quang , Nguyen Ngoc , Victor Koledov , Alexander Kamantsev , Alexey Mashirov , Nguyen Dan
Published: July 2018

In this paper, we investigated the influence of additional compounds of Dy-Nb-Al, Nd-Cu-Al… on the coercivity of the sintered Nd16.5Fe77B6.5 magnets. The additional compounds were first prepared by arc-melting method and then ground into particles with size in the range of 40 - 80 nm using a high energy ball milling method. After that, the additional powder were mixed with micrometer Nd-Fe-B powder before magnetic anisotropic pressing, vacuum sintering and annealing. The structure of the magnets was thoroughly analyzed using X-ray diffraction and electron microscopy techniques. The magnetic properties of the magnets were investigated on a pulsed field magnetometer. The results show that the coercivity of the sintered Nd-Fe-B magnets can be improved by introducing additional nanoparticles to their grain boundaries. The improvement of the coercivity of the magnets is clearly dependent on composition and fraction of the additional compounds. The coercivity has been enhanced 40% for the magnets by adding 3 wt% of the Dy-free compound of Nd40Cu30Al30.
Peculiarities of the magnetocaloric effect in FeRh-based alloys in the vicinity of the first order magnetic phase transition
Authors: Gimaev Radel , Zverev Vladimir , Spichkin Yury , Tishin Alexander , Miyanaga Takafumi
Published: July 2018

Medical applications of magnetocaloric effect (MCE) require possibility for precision shift of a temperature of the magnetic phase transition at the same MCE value and minimize irreversibility. Thus, detail dynamic MCE investigation of such alloys with non-toxic biocompatible dopants need to be done. In present work, the giant magnetocaloric effect, which is observed in the whole family of Fe-Rh alloys, has been investigated in Pd-doped samples in slowly cycled magnetic fields of up to 1.8 T in magnitude for a range of temperatures, 250 K < T < 350 K. The shift of the ferromagnetic/antiferromagnetic transition temperature down towards room temperature and the decrease in the MCE have been observed in these alloys in comparison with a quasi-equiatomic FeRh alloy. The measurements have also shown an asymmetric behaviour of the first order magnetic phase transition with respect to whether the transition is traversed by heating from lower temperatures or cooling from above. These peculiarities have been explained in the framework of the ab-initio density functional theory-based disordered local moment theory of the MCE. The results have been compared with the those for the non-doped FeRh alloy. Thus features of the first order magnetic phase transition that these alloys have in common have been revealed which enable some predictions to be made appropriate for practical applications.
Ternary phase diagram of Ni-Mn-Ga: insights from ab initio calculations
Authors: Sokolovskaya Yulia , Zagrebin Mikhail , Buchelnikov Vasiliy , Zayak Alexey
Published: July 2018

In this work we perform a wide-range systematic study of the family off-stoichiometric Ni-Mn-Ga alloys by using the supercell approach in the framework of density functional theory. Our goal is to explore the compositional variations of the structural stability and magnetic properties of Ni-Mn-Ga compositions. As a result equilibrium lattice parameters, bulk moduli, total magnetic moments, and formation energies of a wide range of Heusler alloys have been mapped on compositional ternary diagrams.
Effect of ageing on magnetic and electrical properties of Ti–substituted La-Sr manganites
Authors: Badelin A. , Datskaya Z. , Estemirova S. , Karpasyuk V. , Merkulov D.
Published: July 2018

The changes of structural, magnetic and electrical parameters of ceramic La0.8-xSr0.2+xMn1-xTixO3+γ (0.025 ≤ x ≤ 0.150) manganites during long-term storage at room temperature and after thermal cycling were investigated. The unit cell volume (V) of all manganites decreased over time. Most considerable decrease of V and broadening of X-ray diffraction lines width were observed in the samples with high quantity of titanium. During the storage period magnetization (σ) and Curie point (Tc) of manganites with relatively low Ti content decreased, while the compositions with high values of “x” exhibited some trend of σ and Tc increase. The resistance of the samples with x < 0.100 increased over time. Fluctuations of magnetization of all thermal-aged samples were within the error of measurement, and Curie point of manganites with x = 0.150 showed the rise. From the data obtained it might be inferred that ageing phenomena in Ti-substituted manganites can be associated with oxidation processes, the transfer of Ti4+ to vacant sites in rare-earth sublattice and formation of microinhomogeneities.
Colossal magnetoresistance and anomalous Hall effect in nonmagnetic semiconductors
Authors: Obukhov Sergei , Panysheva Tatiana
Published: July 2018

Colossal Magnetoresistance (CMR) in nonmagnetic semiconductors and magnetic materials has been investigated as a function of magnetic field, charge carriers concentration and temperature. Both types of materials demonstrated qualitative and quantitative coincidence of CMR dependence on magnetic field, charge carriers concentration and temperature. The findings support the CMR interpretation in the framework of the Excitonic Insulator (EI) model and transition of an insulating EI phase to conducting state under magnetic field for all types of materials under study. It is suggested that Jahn-Teller distortion caused by magnetic ions and external uniaxial stress could initiate EI phase formation
Temperature characteristics of the nonlinear magnetoelectric effect
Authors: Burdin Dmitry , Ekonomov Nikolay , Chashin Dmitry , Fetisov Yury
Published: July 2018

The temperature characteristics of the nonresonant nonlinear magnetoelectric effect in the twolayer LGT-Metglas structure at a large excitation field amplitude are studied. It is shown that the harmonics of the signal have a different course when the temperature is varied in the range from 200 K to 400 K, which is explained by a change in the shape of the magnetization curve. Amplitude of alternating magnetic field affects the form of each ME voltage harmonic.
Magnetoelectric effect in ferromagnetic-semiconductor layered composite structures
Authors: Fetisov Leonid , Chashin Dmitri , Saveliev Dmitri , Plekhanova Daria , Makarova Ludmila , Stognii Alexandr
Published: July 2018

The results of magnetoelectric effect experimental studies in two different structures based on piezoelectric semiconductor gallium arsenide are presented. The monolithic structure consisted of a gallium arsenide substrate with deposited nickel layer (GaAs-Ni), and the composite structure contained a semiconductor substrate with an amorphous magnetic alloy (GaAs-Metglas) ribbon glued on one side. A quality factor Q ≈ 23500 and magnetoelectric coefficient of 316 V/Oe.cm were achieved at the frequency of planar acoustic oscillations for GaAs-Ni structure at room temperature.
Suppression of the magnetoelectric hysteresis in a composite langatate-metglas structure
Authors: Burdin D.A. , Chashin D.V. , Ekonomov N.A. , Fetisov L.Y. , Fetisov Y.K.
Published: July 2018

The suppression of the magnetoelectric effect hysteresis in a composite planar structure containing mechanically coupled layers of piezoelectric langatate and magnetostrictive amorphous alloy Metglas was observed and investigated. As the pumping magnetic field with frequency ~84 kHz was increased from 0.6 Oe up to 20 Oe, the coercive fields for the 1st and 3rd voltage harmonics generated by the structure were decreased from ~0.7 Oe up to zero. The suppression of the magnetoelectric hysteresis will allow increasing of absolute accuracy of the magnetoelectric magnetic field sensors by ~2 orders of magnitude.
Superconducting mesa-structures with a spin filtering manganite interlayer
Authors: Constantinian Karen , Ovsyannikov Gennady , Kislinskii Yulii , Demidov Victor , Shadrin Anton , Petrzhik Andrey
Published: July 2018

We report on current transport and magnetism in hybrid superconducting mesa-structures prepared from epitaxial superconductor YBa2Cu3O7-δ and manganite LaMnO3 thin films. Superconducting Au-Nb bilayer was the top electrode. Measurements of magnetic resonance in heterostructure with the only Au top electrode (without Nb) showed ferromagnetic state close to Curie temperature of LaMnO3, 150 K. A spin filtering was revealed by measurements of tunneling magneto-resistance. Mesa-structures had no superconducting current even at reduced temperature T=300 mK and the smallest manganite interlayer thickness, dM=5.6 nm. Varying the external magnetic field |H|<10 Oe and dc bias current |I|<0.5 mA the microwave generation with power P <1 pW with a line-width of order 50 MHz was observed in GHz frequency band. The frequency of generation could be tuned by the biasing current with a rate 1013 Hz/A. The impact of spin polarized current on microwave generation is discussed taking into account the asymmetry of oscillation amplitudes over the applied magnetic field.
Nonlinear Response of a Superconductor of the Bi-Sr-Ca-Cu-O System to an Alternating Magnetic Field in the Superconducting Transition Temperature Range
Authors: Sergeev Alexander , Golev Igor , Gvozdevskaya Victoria , Barkalova Anastasia
Published: July 2018

The nonlinear response of the superconductor of the Bi-Sr-Ca-Cu-O system in the temperature range of the superconducting transition under the action of a harmonic alternating magnetic field is experimentally studied. For multiphase superconductors having in their volume regions with distinct critical temperatures, the effect of odd harmonics in the response signal is observed. The contribution of crystallites and the system of weak bonds between the crystallites in the nonlinear response is singled out. It was found that the nonlinear properties of the investigated samples in the resistive state are determined mainly by the nonlinear current-voltage characteristics of the system of weak bonds between the crystallites.
Effects of magnetic fields on capillary-gravity waves in the presence of magnetic surfactants
Authors: Zhukov Alexander V.
Published: July 2018

The stability of capillary-gravity wave motion on horizontal free surface of viscous noncompressible fluid in the presence of magnetic surfactant in an external magnetic field was studied. It is shown that for normal as well as for tangential external magnetic field the horizontal free liquid surface is unstable for field strength exceeding some critical value that does not depend on the elastic constant of the surfactant film. However, for oblique external magnetic field the stability of the free surface depends not only on the field value but also on the surfactant elastic constant.
Levitation and motion of a magnet partially immersed into a magnetic fluid
Authors: Pelevina Daria , Kobzev Mikhail , Kalmykov Sergey , Merkulov Dmitrii , Naletova Vera
Published: July 2018

The levitation of a permanent disc magnet partially immersed into a magnetic fluid volume on a horizontal plane is studied theoretically and experimentally. Motion of the magnet along a thin magnetic fluid layer is investigated experimentally. A mathematical model of the magnet dynamics is proposed.
On the temperature dependence of ferrofluid susceptibility
Authors: Dikansky Yuri , Ispiryan Anna , Kunikin Stanislav
Published: July 2018

The fulfillment of Curie– Weiss laws for a ferrofluid is critically discussed. The results of investigations of the magnetic susceptibility temperature dependences of ferrofluid and dried powder of magnetic particles are presented. The effective field parameter is computed in approximation of the effective field theory. It is indicated that the value of the effective field parameter is not constant and depends on the concentration of magnetic nanoparticles and the temperature of the sample. It was found that Curie-Weiss law with λ = 4π / 3 is satisfied for ferrofluid with a limited range of volume concentration of magnetic particles.
Volumetric registration of magnetic nanoparticles for optimization of quantitative immunochromatographic assays for detection of small molecules
Authors: Guteneva Natalia V. , Znoyko Sergey L. , Orlov Alexey V. , Nikitin Maxim P. , Nikitin Petr I.
Published: July 2018

Precise quantitative and highly sensitive detection of small molecules (haptens) is highly demanded in medicine, food quality control, in vitro diagnostics, criminalistics, environmental monitoring, etc. In the present work, the magnetic method of particle quantification and the optical methods of spectral correlation and spectral phase interferometry complement each other for optimization of a quantitative assay for measuring concentrations of small molecules. The assay employs magnetic nanoparticles as labels in rapid immunochromatographic format. The approach was demonstrated with fluorescein as a model molecule. The interferometric label-free biosensors were employed for selection of optimal reagents that produced high specificity and sensitivity. The method of magnetic particle quantification counted the magnetic labels over the entire volume of the immunochromatographic membrane to provide their distribution along the test strip. Such distribution was used for optimization of such parameters as concentrations of the used reagents and of antibody immobilized on the labels, amount of the labels and conjugates of haptens with protein carriers to realize the advanced quantitative immunochromatographic assay.
Laws of volume elasticity in physical processes of the effect of T, P, H parameters on the lattice modifications, phase transitions, conductivity and magnetism
Authors: Polyakov Petr
Published: July 2018

Analysis of the experimental results allows to single out the law of bulk elasticity that implies that the structural binding energy is formed by physical and chemical methods and transformed into elastic stresses that control lattice changes, formation of phase transitions, resistivity and magnetism in the course of physical processes under the effect of parameters. The laws of volume thermo-, baro-and magnetoelasticity are the determining factors in lattice modifications in the structure sites together with the composition variation.
Phase transitions and thermodynamic properties of the antiferromagnetic Potts model on a face-centered cubic lattice
Authors: Babaev Albert , Murtazaev Akai , Kassan-Ogly Felix , Proshkin Alexey
Published: July 2018

Using the Monte Carlo method we investigate the phase transitions and thermodynamic properties of magnetic structures with noncollinear directions of magnetic moments corresponded to antiferromagnetic q=4 Potts model on a face-centered cubic lattice. Monte Carlo simulations are performed on lattices with linear sizes L=20÷44. Thermodynamic parameters: the order parameter mAF, susceptibility χ, internal energy U, and specific heat C are evaluated for all studied systems. By employing the fourth order Binder cumulant method, a first order transition is shown to be occurred in the model.
Spin-Density Correlations and Short-Range Order in Metals above the Curie Temperature
Authors: Melnikov Nikolai B. , Reser Boris I. , Paradezhenko Georgii V.
Published: July 2018

In the dynamic spin-fluctuation theory, we calculate the effective and local magnetic moments and spatial spin-density correlator. Our theoretical results are demonstrated by the example of bcc Fe. The effective and local moments are found in good agrement with results of polarized neutron scattering experiment over a wide temperature range. The calculated short-range order is small (up to 5 Å) and slowly decreases with temperature
Intact stability and seakeeping characteristics of autonomous surface vehicle (asv) using swath hullform to support bathymetry survey activities on the coastal area
Authors: Ahmad Fauzan Zakki , Triwiyatno Aris , Sasmito Bandi , Nubly Muhammad H.
Published: July 2018

The information is an important thing to search a new resource. In this decade, with leading-edge technology is easier to find any information about our earth. Thus, that is must be explored by the ships. The exploration works usually take a long time, and for convenience, the unmanned technology is much promised. In this research, we focused on the autonomous surface vehicle for bathymetry survey. To design the ASV, we must consider the reliability, efficiency, and safety. To reach those three components, the analysis of resistance, stability and wave response are necessary. Therefore, the hull form design is focused on Small Waterplane Area Twin Hull (SWATH) hull form. According to the numerical analysis, the proposed SWATH hull form of ASV is suitable for bathymetry activities. It can be proved by the stability performance which the maximum value of GZ is at 26.40. The resistance calculation result is indicated that the drag of coefficient of this hull form is about 0.013.
Comparative Study of Structural Geometric to the Ultimate Strength on Fixed Jacket Platform
Authors: Zubair Muis Muhammad Alie , Icon Yan Franchover Obednego , Achmad Yasir Baeda , Rachman Taufiqur , Juswan
Published: July 2018

The brace configuration plays an important role to the ultimate strength of fixed jacket platform. The braces against the combined load in vertical and horizontal direction. In the present study, the ultimate strength of the fixed jacket platform is analysed considering the shape of the structural geometric. Four types of brace configuration namely, K, N, X and Y are taken to be assessed. Dimensions of the structure are constant including properties and materials. The boundary conditions are assumed to be fixed at the bottom part. The Non-Linear Finite Element Analysis (NLFEA) is adopted to calculate the ultimate strength of the structure and those results of brace configuration are compared with one another and discussed in the present study.
Experimental Study of Scouring Characteristic Around Hexagonal Artificial Reef
Authors: Dwito Armono Haryo , Wirayuhanto Harish
Published: July 2018

Artificial reef is a structure placed underwater which has similar function with natural reef. Artificial reef can also serve as a submerged breakwater. When placed in shallow water, the structure is vulnerable to scouring and soil subsidence which cause structural failure. This paper present serial testings in Ocean Environment and Ocean Energy Laboratory, Ocean Engineering Department, ITS, to determine the scouring characteristic with variation of gap, and waves for 1: 10 model scale hexagonal artificial reef. The results of this research can guide the planning of structural protection against scouring. From a series of tests, it can be summarized that for 1 diameter gap reef distance, the maximum scouring occurs behind the structure, whereas for no gap distance, it occurs at the front of the structure. At the center of the structure, for no gap distance, sedimentation occurs dominantly, whereas for 1 diameter gap distance, scouring process occurs dominantly. The maximum scouring depth (5,3cm) occurs when the gap is equal to 1 diameter of reefs and minimum scour(2,9 cm) occurs when there is no gap between the reef.
Tidal, wave, current and sediment flow patterns in wet season in the estuary of Porong River Sidoarjo, Indonesia
Authors: Engki A. Kisnarti , Viv Dj. Prasita
Published: July 2018

The objectives of this research are to analyze characteristics of physical oceanography, such as : tides, waves, currents, and discharges at Muara Kali Porong. This research also discuss sediment flow patterns and morphology in around the Estuary of Porong River. Tidal data were used as correction to the depth. The calculation to determine the tidal current velocity and wind data along with current data are used for simulation model. Sedimentation process with a simulation of 15 days in the West Season occured in the Northeast of Lusi Island with sediment thickness ranged from 1.6 to 2.6 m.
Bio-Inhibitor on Corrosion Rate of ASTM A53 Steel in Marine Environment
Authors: Pratikno Herman , Sulistiyaning Titah Harmin , Kurnia Shandy Yossy
Published: July 2018

There are many methods to prevent the corrosion process. One of them is corrosion inhibitors usage. Inhibitor divided into two types, there are organic inhibitor and non-organic inhibitor. Organic inhibitor could be obtained by extracting some materials which exist in nature. In this research, bio-inhibitors were made from rambutan (Nephelium lappaceum) peel, banana (Musa acuminata Colla) peel, mango (Mangifera indica L.) leaves and papaya (Carica papaya)leaves. The determination of corrosion rate used weight loss method. The material of carbon steel ASTM A53 was used in the research. The salinity of artificial seawater was 35 ‰. The results showed that corrosion rate on carbon steel ASTM A53 was 0.2172 mpy at mango leaves and the efficiency of those inhibitor was 44.5%. The corrosion rate carbon steel ASTM A53 was 0.2436 mpy for corrosion rate and 37.8% of inhibitor efficiency when it used papaya leaves as bioinhibitor. Meanwhile, it reached 0.2739 mpy and 0.2812 mpy of corrosion rate for banana peel and rambutan peel, respectively. The efficiency of inhibitor were 30% and 28.2% for banana peel and rambutan peel, respectively. The corrosion rate on carbon steel ASTM A53 without inhibitor was 0.3914 mpy. Based on the microstructure results, all specimens in all variation of treatments showed pitting corrosion and uniform corrosion on specimen. In conclusion, mango leaves, papaya leaves, banana peel and rambutan peel have potentially to be used as bio-inhibitor to decrease the corrosion rate in marine environment.
The Estimation of Volume and Type of Household Waste in the Coastal Village, Besuki Region, Situbondo, East Java
Authors: Sseptiningtiyas Dina T , Sakinah Wazirotus , Listriyana Ani
Published: July 2018

Population growth is very influential on the amount of waste generated. The available land is very limited. The coastal community in Besuki mostly disposes garbage in the sea of any river due to unavailability of landfill. So we need a study on the estimated volume and type of waste generated by households in coastal village in Besuki region, Situbondo. This study used 10 household samples spread over coastal village. The study was conducted for 8 days using survey method with sampling (Proportional Random Sampling). Based on the results of the preparation, obtained the waste generated in the form of organic waste and non-organic waste. The composition of organic waste can be selected into several types of leaves, garbage, household, food scraps, and wood. As for the type of non-organic waste can be sorted into plastic, paper, metal, rubber, styrofoam, and cloth. The total amount volume of waste produced per household in a day in coastal villages is 47,3 liters with the largest composition of waste generated from plastic by 43,36%.
Analysis of static structural of ocean FARMITS offshore cage due to environmental load
Authors: Purnawanti Yani , Syahroni Nur , Mulyadi Yeyes
Published: July 2018

Consumption of fish in Indonesia continuously increase from 2000 to 2014. Particularly fish farming in Java from 2006-2014 is quite high, so there need to be adequate facilities for fish farming. Responding to these challenges, we developed Offshore Cage Ocean FARMITS technology specifically designed For the southern waters of Java Island. This paper discusses the static structure strength analysis of deformation and maximum yield strength that occurs on the offshore cage structure of Ocean FARMITS. The frame structure made of hollow pipe made from HDPE will be placed at 4,41m Wave Height, with a period of 19s. Numerical simulations are performed to obtain a motion response RAO and structural response due to random waves. This Structure is then analyzed under mooring conditions with the Catenary Mooring configuration. Rope stress that occur due to environmental loads will give tension stress to the structure, resulting in the offshore cage structure to occur maximum stress and deformation. The result of this research is to prove that the structure that is made by HDPE able to restrain the tension force of mooring line stress. This has been validated by the standard of Practical Aspects of Offshore Aquaculture System Design from Aquaculture America, so this structure can be said to be operating safely under Indonesian Irregular Wave.
Submarine rudder stern-plane configuration for optimum manoeuvring
Authors: Suastika Ketut , Virliani Putri , Wasis D. Aryawan
Published: July 2018

The purpose of the present study is to investigate submarine rudder stern-plane configuration to obtain optimum manoeuvring characteristics. Three configurations are investigated: +, x and y configuration. The equations of motions were derived with the external forces and moments consist of contributions due to the hydrostatics, hydrodynamics and propeller thrust. To obtain the hydrodynamic coefficients and the hydrodynamic derivatives, the lift and drag were calculated using computational fluid dynamics (CFD). The equations of motions were numerically integrated using Eulerian method to obtain the turning circle. Results of the calculations show that the x-configuration gives the smallest tactical diameter, transfer and advance, which is considered as the most optimum rudder stern-plane configuration.
Chronisch entzündliche Darmerkrankungen: Neue Therapieformen
Authors: Klag Thomas , Wehkamp Jan
Published: July 2018

New promising treatment options for chronic inflammatory bowel diseases, confirm the expanded pathophysiological understanding in terms of the interactions of the gastrointestinal microbiome with the adaptive and innate immune response and barrier protection. Therefore, these interrelations are focus of research and therapeutic strategies. The following review will give insights into the pathomechanisms, current treatment options and future developments.
Chronisch-entzündliche Darmerkrankungen: Diagnostik und Therapie in der Praxis
Authors: Teich Niels , Klugmann Tobias
Published: July 2018

Significant increases in Crohn’s disease incidence have been noticed in recent decades. Therefore it gets more important to increase practical knowledge, present therapy innovations and draw attention to the need for vaccinations of immunosuppressed IBD patients as well as useful supportive therapy options.
Evaluation of Vascular Remodeling in Carotid Atherosclerosis Among Type 2 Diabetes Mellitus Patients Using High-Frequency Ultrasonography Combined with Serum Resistin
Authors: Wang Li-Kun , Wu Xue-Liang , Shi Li , Yang Rui-Min , Liu Wei-Liang , Hu Zhen-Shun , Zhang Zhi-Hua , Wang Yi-Cheng
Published: July 2018

Diabetes remains a long standing public health issue among the Chinese population, with an incidence of up to 11.6%, of which type 2 diabetes mellitus (T2DM) accounts for 85%–95%. During this study, we aimed to elucidate the value of high-frequency ultrasonography (HFUS) combined with serum resistin on vascular remodeling (VR) in carotid atherosclerosis (CA) among patients suffering from T2DM. A total of 432 T2DM were recruited and assigned into the short T2DM duration group (<5 years), middle T2DM duration group (5~10 years) and long T2DM duration group (>10 years), while another 172 healthy cases were recruited as the control group. The intima-media thickness (IMT) as well as plaque score, detection rate and type were detected by the HFUS. The respective blood pressure readings were measured and pulse pressure was calculated accordingly. The serum resistin level, remodeling incidence and type, levels of total cholesterol (TC), fasting blood glucose (FBG), low-density lipoprotein cholesterol (LDL-C), high-density liproprotein cholesterol (HDL-C), and triglyceride (TG) were measured. The correlation between IMT, the plaque detection rate and blood pressure were analyzed. A receiver operating characteristic (ROC) curve was constructed in order to evaluate the impact of VR in CA on T2DM patients who were solely using HFUS and serum resistin respectively, as well as a combination of HFUS with serum resistin. As In comparison with the control group, the short, middle and long T2DM duration groups all displayed increased IMT, plaque score and detection rate, serum resistin level and VR incidence, especially for the long T2DM duration group. Levels of TC, TG, FBG and LDL-C were much higher while HDL-C was lower among patients with T2DM than those in the control group. A positive correlation was detected between the disease course and IMT. The detection rate of plaque with thickening IMT exhibited upregulated levels when compared to those with normal IMT. The HFUS, serum resistin and HFUS combined with serum resistin respective areas under the ROC curve were 0.873, 0.867 and 0.923, respectively, suggesting that the combination of HFUS and serum resistin was superior to that of individual HFUS or individual serum resistin in regard to the impact of VR in CA on T2DM patients. The results of this study revealed that the combination of HFUS and serum resistin was superior to individual HFUS or individual serum resistin in relation to its ability to evaluate the impact of VR in CA in patients with T2DM.
Wissensstand von Patienten und Gesundheitsberufen über Diabetes-bedingte Augenerkrankungen (Risikofaktoren, Früherkennung und Behandlung)
Authors: Röck Daniel , Schnellbächer Elisabeth , Fritsche Andreas , Ziemssen Tjalf , Ziemssen Focke , Marahrens Lydia
Published: July 2018

Die diabetische Retinopathie ist zwar von Betroffenen am meisten gefürchtet. Eine Auffrischung des Wissens über die Komplikation und ihre Behandlung stellt sich selbst für Betroffene und Experten in Gesundheitsberufen nicht einfach dar. Die Augenheilkunde steht als Fachrichtung etwas isoliert und weist weitere Spezialisierungen auf. Deshalb sollte mit dieser Studie der aktuelle Wissensstand und relevante Lücken strukturiert erfasst werden.

Material und Methoden Der etablierte Eye-Q Fragebogen (© National Eye Institute) wurde ins Deutsche übersetzt und mit Fragen zur optischen Kohärenztomografie (OCT) sowie intravitrealen operativen Medikamentenapplikation (IVOM) ergänzt. 810 Patienten mit Diabetes wurden im Rahmen der Querschnittsstudie (NCT02311504) an diabetologischen Schwerpunktpraxen befragt. Parallel wurde der Fragebogen durch 190 Ärzte und 90 Diabetesberater im Rahmen des 49. Diabetes-Kongress der Deutschen Diabetes Gesellschaft (DDG 2014) beantwortet.

Ergebnisse Während die mittlere Gesamtpunktzahl der Betroffenen mit Diabetes 4,9 (von 9 möglichen Punkten für den Eye-Q Komplex) betrug, erreichten die Gesundheitsexperten einen mittleren Score von 6,8. Die Ärztinnen und Ärzte (Diabetologen: 7,5, Internisten: 7,2, Hausärzte: 7,0) erzielten dabei ein besseres Ergebnis als Diabetesberater/innen (5,8) und Diabetesassistentinnen (5,7). Als schwerwiegend muss beachtet werden, dass nach wie vor noch ein erheblicher Teil der Betroffenen (272 von 805) frühe Warnzeichen für den Fall einer diabetischen Retinopathie erwartet. Weniger offensichtliche Auswirkungen des Diabetes am Auge wie das trockene Auge, die Katarakt oder das Glaukom wurden sowohl in der Patientengruppe als auch unter den Diabetes-Behandlern unterschätzt. Fragen zum Einsatz neuerer Diagnostik (OCT: 38 %) und Therapien (IVOM: 16 %) wurden selbst unter den befragten Fachleuten nur von einer Minderheit korrekt beantwortet.

Diskussion Bezüglich der Komplikationen der Augen haben die auf Diabetes spezialisierten Fachleute einen deutlichen Wissensvorsprung gegenüber den Betroffenen. Wissenslücken im Bereich der verschiedenen diabetischen Augenkomplikationen und insbesondere neuerer diagnostischer und therapeutischer Möglichkeiten unterstreichen aber den Bedarf eines intensiveren interdisziplinären Austausches und besserer Schulungsprogramme.
Randomized study of digital single-operator cholangioscope compared to fiberoptic single-operator cholangioscope in a novel cholangioscopy bench model
Authors: Shah Raj , Neuhaus Horst , Parsi Mansour , Reddy D. , Pleskow Douglas
Published: July 2018

Background and study aims Cholangiopancreatoscopy is utilized for diagnosis and therapy of pancreaticobiliary disorders. a fully-disposable, digital, single-operator cholangioscope (DSOC) was developed with high image resolution and wide field-of-view. This bench study compared the new DSOC to the previous semi-disposable, fiber-optic cholangioscope (FSOC) prior to the clinical availability of the DSOC system.

Methods Five experts performed one practice run followed by randomized runs comparing DSOC to FSOC in a biliary tract model consisting of three fixed left-intrahepatic tracts (LIHD), and variable common bile duct (CBD) and right-intrahepatic tracts (RIHD) with seven total lesions in multiple configurations. Timed runs aimed to visualize and target each lesion using miniature biopsy forceps. Definitions: visual success, visualizing targets; targeting success, touching target with forceps; complete run, touching seven targets within 20 minutes. Image quality, ease-of-use, and time to completion were recorded.

Results Thirty-seven evaluable runs (20 DSOC, 17 FSOC) were completed. DSOC was superior to FSOC in Visual (99 % vs. 67 %, P < 0.001) and targeting success (6.6 vs. 4.5, P = 0.009), proportion of complete runs (13 /20 vs. 0 /17, P < 0.001) and time of run (10.1 min vs. 15.4 min, P < 0.001). For fixed LIHD, DSOC achieved higher targeting success compared to FSOC (2.6 vs. 1.1, P < 0.001) with no difference in RIHD and CBD targets (4.0 vs. 3.4, P = 0.39). Investigators reported superior image quality and ease-of-use with DSOC.

Conclusions In this model, DSOC performed superiorly to FSOC in image quality, visualization, and maneuverability. The model could potentially be utilized for training endoscopists less experienced with cholangiopancreatoscopy.