scholarly journals Возможность управления динамикой и структурой магнитного солитона в трехслойной ферромагнитной структуре

2021 ◽  
Vol 47 (10) ◽  
pp. 15
Author(s):  
Е.Г. Екомасов ◽  
В.Н. Назаров ◽  
К.Ю. Самсонов ◽  
Р.Р. Муртазин
Keyword(s):  
Magnetic Fields ◽  
Thin Layer ◽  
Small Amplitude ◽  
Equation Of Motion ◽  
Geometric Parameters ◽  
Variable Frequency ◽  
Layer Width ◽  
Resonant Effect ◽  
Translational Mode ◽  
Over Time

The generation and excitation of a magnetic soliton in a three-layer ferromagnet by constant magnetic fields and fields of variable frequency and small amplitude in the presence of dissipation in the system are considered. The analysis of the solutions of the equation of motion in an alternating field shows the possibility of increasing the amplitude of the magnetic soliton over time under certain conditions. The resonant effect is also affected by the geometric parameters of the thin layer: at a large layer width, the translational mode of the soliton oscillations is also excited.

Nature of inclined growth in thin-layer electrodeposition under uniform magnetic fields

2012 ◽  
Vol 86 (5) ◽  
Author(s):  
Alejandro Soba ◽  
Graciela González ◽  
Lucas Calivar ◽  
Guillermo Marshall
Keyword(s):  
Magnetic Fields ◽  
Thin Layer

NONUNIFORM NONLINEAR OSCILLATIONS OF A DOMAIN WALL IN UNIAXIAL FERROMAGNET

1994 ◽  
Vol 04 (03) ◽  
pp. 569-578
Author(s):  
A.F. POPKOV ◽  
I.P. YAREMA ◽  
V.M. ELEONSKY
Keyword(s):  
Magnetic Fields ◽  
Domain Wall ◽  
Small Amplitude ◽  
Nonlinear Oscillations ◽  
Uniaxial Anisotropy ◽  
Life Time ◽  
Uniaxial Ferromagnet ◽  
Alternating Magnetic Fields

The nonlinear small amplitude excitations of a domain wall (DW) in the ferromagnet with high uniaxial anisotropy are investigated using reduced magnetodynamic equations. The “life-time” of soliton-like oscillations of DW in the nondissipative media is defined. The conditions of direct and parametric stabilization of self-localized DW oscillations by alternating magnetic fields are analyzed in the presence of dissipation.

scholarly journals Experimental Study on Time-Dependent Changes in Rheological Properties and Flow Rate of 3D Concrete Printing Materials

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6278
Author(s):  
Hojae Lee ◽  
Eun-A Seo ◽  
Won-Woo Kim ◽  
Jae-Heum Moon
Keyword(s):  
Rheological Properties ◽  
Flow Rate ◽  
Test Specimen ◽  
Three Dimensional ◽  
Time Dependent ◽  
Flow Properties ◽  
Layer Width ◽  
Binder Ratio ◽  
Water To Binder Ratio ◽  
Over Time

Three-dimensional concrete printing (3DCP) materials require a relatively low water-to-binder ratio (W/B) of 0.3 or less to ensure their buildability and flow properties are sufficiently maintained after mixing. In this study, the rheological properties of 3DCP materials with W/B 0.28 were evaluated up to 60 min after mixing, and the yield stress and plastic viscosity were analyzed over time. A gradual decrease in flow rate with time was observed during the transport of 200 kg of material per batch through a 20 m hose. To examine the time-dependent changes in flow rate and layer volume, a 2200 mm × 1000 mm test specimen was printed. The dependence of the layer width over time during the printing process was measured and analyzed. The experimental analyses showed that the flow rate and layer volume of the 3DCP material gradually decreased with time after mixing, which was correlated with the rheological properties.

Analysis of the geometric parameters influence in PCB fixtures for 2D multipole magnetization patterning of thin layer micro-magnets

2019 ◽  
Vol 61 (1) ◽  
pp. 59-71
Author(s):  
Miriam Martinez-Muñoz ◽  
Efren Diez-Jimenez ◽  
Rocio Sanchez-Montero ◽  
Pablo Luis Lopez-Espi ◽  
Juan Antonio Martinez-Rojas
Keyword(s):  
Thin Layer ◽  
Geometric Parameters

scholarly journals Photometric and H-Alpha Variability in Some Be Stars

1987 ◽  
Vol 92 ◽  
pp. 101-103
Author(s):  
S. Catalano ◽  
G. Umana
Keyword(s):  
Magnetic Fields ◽  
Time Scales ◽  
Time Scale ◽  
Small Amplitude ◽  
Rotation Period ◽  
Light Curves ◽  
Radial Pulsation ◽  
Be Stars ◽  
Relative Movement ◽  
Short Term

Short-term variations, typically with small amplitude (Δm < 0.1 mag.), time-scales of hours or near one day and in many cases correlated with the rotation period have been found to be commonplace among Be stars (see Harmanec and Pavlovski 1983 for review and papers). Radial and non-radial pulsation modes have been proposed to explain this variability. However, the light curves are often double-peaked, at first suggesting the stars may have large organized dipole magnetic fields and spots not unlike those in the Ap or Bp stars (Harmanec 1983). These rotationally modulated variations are not stable, and seem to vary in both amplitude and period in the sense that intervals with well defined light curves alternate with intervals when variations are absent. This phenomenon is very reminiscent of formation and apparent relative movement in longitude of spots (groups) in some RS CVn binaries (Catalano 1983, Rodono 1986), but on a much more rapid time scale.

Neurone bioelectric activity under magnetic fields of variable frequency in the range of 0.1–80Hz

2004 ◽  
Vol 272-276 ◽  
pp. 2424-2425 ◽  
Author(s):  
R.N. Pérez Bruzón ◽  
Marı́a J. Azanza ◽  
Ana C. Calvo ◽  
A. del Moral
Keyword(s):  
Magnetic Fields ◽  
Variable Frequency ◽  
Bioelectric Activity

AMBULATORY EFFECTS OF BRIEF EXPOSURES TO MAGNETIC FIELDS CHANGING ORTHOGONALLY IN SPACE OVER TIME

2007 ◽  
Vol 117 (3) ◽  
pp. 417-420
Author(s):  
L. S. ST-PIERRE ◽  
S. A. KOREN ◽  
M. A. PERSINGER
Keyword(s):  
Magnetic Fields ◽  
Over Time

Stability of Disodium Sulfobenzylpenicillin in Large Volume Parenteral Solutions

1978 ◽  
Vol 12 (7) ◽  
pp. 418-423
Author(s):  
Hiroshi Fukuchi ◽  
Minoru Yoshida ◽  
Michio Kumagai ◽  
Teruaki Kitaura
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Thin Layer ◽  
Large Volume ◽  
Degradation Product ◽  
Degradation Products ◽  
Residual Rate ◽  
The Stability ◽  
Layer Chromatography ◽  
Over Time

The stability of disodium sulfobenzylpenicillin (SB-PC) in several large-volume parenteral solutions was studied. A study was also made of the influences of other additive drugs upon the stability of SB-PC in SB-PC IV fluid admixtures. Quantitative determinations were made by iodometry of the residual rate over time of SB-PC. The residual rate of SB-PC in 5-fluorouracil (5-FU injection)-10 percent glucose admixture was 67 percent after 24 hours at 25 °C, (77 °F) and in aminophylline (aminophylline injection J.P.)-10 percent glucose admixture it was 54 percent after 24 hours. It was found that the decomposition of SB-PC was due to amines which were added to these injections. In an admixture of amino acid and SB-PC, the residual rate of SB-PC decreased linearly with the increase in amino acid concentration. In the 12 kinds of amino acids used in this study, the greatest decrease was observed in the admixture with lysine, the residual rate being 76.7 percent. For the study of degradation products of SB-PC, thin layer chromatography was employed and a spot of the degradation product was detected at an Rf value of 0.2.

scholarly journals GELEŽINKELIO KELIO GEOMETRINIŲ PARAMETRŲ DINAMIKOS TYRIMAS TAIKANT KELIO KOKYBĖS INDEKSĄ / RAILWAYS GEOMETRICAL PARAMETERS DYNAMICS INVESTIGATION BY TRACK QUALITY INDEX

2018 ◽  
Vol 10 (0) ◽  
pp. 1-7
Author(s):  
Vytautas Motiejus Bubnelis ◽  
Benas Slepakovas ◽  
Laura Černiauskaitė ◽  
Henrikas Sivilevičius
Keyword(s):  
Quality Index ◽  
Rail Transport ◽  
Geometric Parameters ◽  
Railway Track ◽  
Geometrical Parameters ◽  
Track Geometry ◽  
Track Condition ◽  
Over Time ◽  
Track Quality

Rail transport, in competition with other modes of transport, has to improve the quality of passenger and freight transport. In order to carry passengers and goods quickly, efficiently and safely, it is necessary take maintenance railways so that their geometric parameters do not exceed the tolerances. About real railway track condition, the data is obtained by track geometry recording car, measuring seven geometric parameters dispersion. This paper presents the methodology for determining and estimating the geometric parameters of the track geometry, which shows that the track quality index (TQI) is the sum of the variance of seven geometric parameters. Experimental research on the two-track A (8km) and B (11km) a three-year period (2015-2017) for all 12-month KKI, establish their quality dynamics (change over time). These data indicate that the quality of the analyzed sections A and B was good, but due to the increasing mass (in megatons) of transported loads, there is a tendency to deteriorate. Santrauka Geležinkelių transportas, konkuruodamas su kitomis transporto rūšimis, privalo gerinti keleivių ir krovinių vežimų kokybę. Norint greitai, efektyviai ir saugiai vežti keleivius ir krovinius, būtina taip prižiūrėti geležinkelių kelius, kad jų geometrinių parametrų nuokrypiai neviršytų leidžiamųjų nuokrypių. Apie tikrąją geležinkelių kelio būklę duomenys gaunami kelmačiu išmatavus septynių geometrinių parametrų sklaidą. Šiame darbe pateikta geležinkelio kelio geometrinių parametrų sklaidos nustatymo ir vertinimo metodika, kurioje įrodyta, kad kelio kokybės indeksas (KKI) yra septynių geometrinių parametrų dispersijų suma. Eksperimentiškai ištyrus dviejų geležinkelio kelių A (8 km) ir B (11 km) trijų metų laikotarpiu (nuo 2015 iki 2017 metų) visų 12 mėnesių KKI, nustatyta jų kokybės dinamika (kaita bėgant laikui). Šie duomenys rodo, kad ištyrinėtų A ir B ruožų kelio kokybė buvo gera, bet dėl didėjančios pervežtų krovinių suminės masės (megatonų skaičiaus) turi tendenciją blogėti.

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