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2 edition of martensite phase transition in NiTi studied by perturbed [gamma]-[gamma] angular correlations found in the catalog.

martensite phase transition in NiTi studied by perturbed [gamma]-[gamma] angular correlations

John C. Sy

martensite phase transition in NiTi studied by perturbed [gamma]-[gamma] angular correlations

by John C. Sy

  • 335 Want to read
  • 21 Currently reading

Published .
Written in English

    Subjects:
  • Hyperfine interactions.

  • Edition Notes

    Statementby John C. Sy.
    The Physical Object
    Paginationix, 34 leaves, bound :
    Number of Pages34
    ID Numbers
    Open LibraryOL16951535M

    A formalism to interpret the perturbations of γ-γ directional correlations from nuclei oriented by heavy-ion induced reactions is described. Applications to multidetector arrays are considered and aspects of experiments designed to measure magnetic dipoCited by: e -gamma distribution is the probability distribu-tion that is area under the curve is unity. (ii) e mean of -gamma distribution is equal to a parameter #. (iii) e variance of -gamma distribution is equal to the product of two parameters #. Proof of (i). Using the de nition of -gamma distribution along with the relation (), we have 1 0 ().

      CalcGamma() computes a 1-D, 2-D, or 3-D local or global Gamma index between two datasets (reference and target) given a defined coordinate space using MATLAB. The Gamma analysis is performed based on the formalism presented by D. A. Low et. al., A technique for the quantitative evaluation of dose distributions., Med Phys. May; 25(5): Multi-Phase-Field Study for Pearlite Transformation with Grain Boundary Diffusion Akinori Yamanaka1, Takashi Yamamoto2, Tomohiro Takaki3, Yoshihiro Tomita2 1Graduate School of Science and Technology, Kobe University, , Rokkodai, Nada, Kobe, Hyogo, Japan, [email protected];File Size: KB.

    The effect of a phase transition (i.e. the order parameter) on the elastic moduli, can be calculated from the volume-, or more generally, the strain-dependence of the transition tem-perature Tc. For any second-order transition described by Landau theory there is a jump δγ in the specific heat coef-. Stability of erythrocyte ghosts: a gamma-ray perturbed angular correlation study. Kruse CA, Tin GW, Baldeschwieler JD. The structural integrity of erythrocyte ghosts made by the preswell and slow-dialysis techniques has been studied in vitro by use of gamma-ray perturbed angular correlation (PAC) techniques and also by standard in vitro leakage Cited by: 3.


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Martensite phase transition in NiTi studied by perturbed [gamma]-[gamma] angular correlations by John C. Sy Download PDF EPUB FB2

The technique of perturbed angular correlation of gamma rays (PAC) was applied to study the martensitic phase transition of a shape-memory-effect alloy Ni Ti doped with In/Cd probe atoms. Spectra measured above and below the martensite starting temperature,M s ≈ K, exhibit quadrupole interactions of probes at cubic and noncubic Cited by: 1.

Martensitic phase transformation in TiNi. The equiatomic TiNi was studied earlier by perturbed angular The martensitic phase transition in NiTi. Hyperfine Interact – ( Author: R.

Sewak, R. Sewak, C. Dey, C. Dey. Perturbed angular correlation (PAC) method was applied to study the martensitic phase transition of the TiPd shape memory alloy doped with In/ Cd probe atoms. The hyperfine interaction parameters and their concentration and temperature dependences for probes with cubic and noncubic surroundings of the lattice sites, consistent with the respective crystal structures in martensite Cited by: 2.

Gamma – Gamma – Angular - Correlation The measurement of γ-angular distributions in coincidence is the standard method of determining the spin of excited nuclear levels. In this experiment the measurement of three-dimensional spectra enables a quick and very accurate determination of the angular distribution characterized by the.

The gamma spectrum of yEu was investigated using 30 cm3 coaxial Ge(Li) detector. Several new gamma-transitions have been identified. Measurements of gamma-gamma coincidences yielded a revised level scheme ofSm. A new level at keV was established.

The spin sequences and the multipolarity mixing ratio of several gamma-ray cascades were established using gamma-gamma angular Cited by: 8. The spin and parity of five levels and the nature of ten transitions in Te were determined by means of gamma-gamma angular correlations and by maki Cited by: Perturbed angular correlation (PAC) method was applied to study the martensitic phase transition of the TiPd shape memory alloy doped with In, Hf, and Zr.

To conserve momentum, the gamma rays must propagate in opposite directions. The angular correlation between the two keV -rays from 22Na is therefore theoretically given by.

However, there is a finite width of the angular correlation due to the finite angular resolution of the detectors used in the experiment. Thermomagnetic analysis and domain structure in the phase transition region of Ni-Mn-Ga and Fig.

Martensite relief of an oriented Co 48 Ni 22 Ga 30 single crystal with a size of 3 ×3×6 mm (a) and respec-tive interference bands observed with the aid of plane parallel indicator film applied to the sample surface (b). Fig. Determine the strength of the relationship. Gamma, like other correlation coefficients, ranges from -1 to +1.

-1 and +1 each indicate perfect relationships. No relationship is indicated by 0. How far from 0 gamma needs to be to be considered "strong" or "moderate" varies with the field of study.

The martensite, Ni 2MnGa, exhibits a “pseudo-gap” behavior at B.E. = eV as T --> T MT. Pseudo-gap at PMT appears to be imperfect nesting (dispersion in ARPES) while perfect nesting occurs at the MT (no dispersion in ARPES). The pre-martensite transition is a failed attempt to transition to a lower energy state.

GAMMA-GAMMAANGULARCORRELATION INTHEDECAYOFCOBALT by CAPTAIN,UNITEDSTATESARMY Submittedinpartialfulfillmentof therequirementsforthedegreeof.

studies. One nev/ gamma ray and four-n«4v cascade transitions are establishedc The existing hyperfine field models are discussed in brief. The systematics of the variation of the dilute impu­ rity hyperfine fields in the host matrices of Fe, Ni, C£ are studied.

All. Perturbed gamma-gamma angular correlation studies of In bound to double and single stranded DNA. Kalfas CA, Sideris EG, Martin PW. Using In as a probe, the dynamics of double and single stranded DNA have been studied by performing time-differential gamma-gamma angular correlation measurements on the keV transitions in by: 9.

The first order martensite transition has been observed clearly through magnetic, electronic-and magneto-transport studies in Ni 45 Mn 44 Sn 11 disordered. Full text of "Gamma-gamma angular correlation in the decay Keally precise measurements of angular correlations involv- ing gamma radiation had to wait until a means of detection more efficient and reliable than Geiger counters could be developed.

but not the parities. If at least one of the transitions is not a pure multipole, it will. Full text of "Gamma-gamma angular correlation in the decay of cobalt See other formats LIBRARY U.S.

NAVAL POSTGRADUATE SCHOOL MONTEREY, CALIFORNIA UNITED STATES NAVAL POSTGRADUATE SCHOOL THESIS GAMMA -GAMMA ANGULAR CORRELATION IN THE DECAY OF COBALT 60 by Fort A.

Vers or, Jr. 12ND P ( GAMMA-GAMMA. ; 13(1) Phase Transformation Studies af a Low Alloy Steel in the (a+γ) Phase Region the intercritical treatment and also the conventional steel heat-treatment.

The tensile properties evaluated were the ultimate tensile strength and percentage. Jump frequencies of In/Cd tracer atoms were measured for a series of layered phases LanCoIn3n+2 using the technique of perturbed angular correlation of gamma rays (PAC).

The frequencies were determined by analysis of nuclear quadrupole relaxation produced by fluctuating electric field gradients.

Samples were synthesized having nominal values n= 1, 2, 3, 5 and, Cited by: 3. John W Cahn and Leonid A Bendersky, An isotropic glass phase in Al-Fe-Si formed by a first order transition, in Amorphous and Nanocrystalline Metals, MRS Symposium MM, Fallaccepted.

Cahn, The angular degrees of freedom and symmetries of interfaces between two-dimensional crystals, in prep. We have investigated the martensitic transformation behavior in a single crystal of Ni2MnGa under various magnetic field.

The single crystal used in the present study exhibits an intermediate phase (I-phase) transformation at TI = K and a martensitic transformation at TM = K. Since the martensite phase (M-phase) of Ni2MnGa has a large magnetocrystalline Cited by: 3.A grain boundary phase transition is defined in terms of discontinuities in the first derivatives of the excess Gibbs free energy for first-order transitions and discontinuities in the higher-order de~vatives of the excess Gibbs free energy for higher-order grain boundary phase transitions.present work the angular correlation apparatus has been adapted for on-line use with the TRISTAN isotope separator.

This report will present, in order, a discussion of the theoretical background of gamma-gamma angular correlations, a brief description of the apparatus and experimental proce­ dure, and the results of three experiments. MeasurementsCited by: 1.