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  • 1
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    Study on Thermal Kinetics of nano Al/micro MnO 2 Thermite System (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-10-12
    Description: In order to explore the thermal kinetics of nano Al-micro MnO 2 thermite system, the Al/MnO 2 thermite sample was mixed by the ultrasonic dispersion method. On the basis of the study of thermal decomposition of MnO 2 powder, the thermal performance of the sample was study by simultaneous thermal analysis technique at the temperature range from room temperature to 1000°C, which could found the thermite reaction occurred in 650-660°C before the melting of Al, which belongs to solid state reactions with the 350 J/g heat releasing. Besides, the microstructure changes of the thermite during reaction were observed by field emission scanning electron microscope (FE-SEM). Based on the TG-DSC test with multiple heating rates and using of the activation energy calculated by Kissniger method, it could be proved the sample had good stability and safety performance.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 2
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    Study on Thermal Chemical Reaction of Al/MnO 2 Thermite (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-10-12
    Description: To explore the reaction characteristics and mechanism of Al/MnO 2 thermite, selecting the high purity micron grade Al and MnO 2 powder, the Al/MnO 2 thermite sample was mixed by the ultrasonic dispersion method. On the basis of the study of thermal decomposition of MnO 2 powder, the thermal performance of the sample was study by simultaneous thermal analysis technique at the temperature range from room temperature to 900°C, and the reaction products were analyzed by X-ray diffraction (XRD). The microstructure changes of the thermite during reaction were observed by field emission scanning electron microscope (FE-SEM). The results showed that the MnO 2 has two processes of thermal decomposition during the temperature rising, and the reaction products were Mn 2 O 3 and Mn 3 O 4 , and the onset temperature were 498.3°C and 781.5°C, the heat release were - 197.1J/g and -57.4 J/g, respectively. Al/...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 3
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    Probing HZγ and Hγγ anomalous couplings in the process e + e − → Hγ (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-11-27
    Description: We propose to measure the HZγ and Hγγ anomalous couplings in the process e + e − → Hγ with the sequential decay of H → bb̄. The discovery potential of observing the anomalous couplings are explored in detail. Our study shows that future electron-positron colliders have great potential to test the HZγ and Hγγ couplings. Conservative bounds on the two anomalous couplings are also derived when no new physics signal is detected on top of the SM backgrounds.
    Print ISSN: 1674-1137
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 4
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    Evidence for coexisting prolate and near-oblate shapes at high spin in 125 Cs (2016)
    Institute of Physics (IOP)
    Details
    Publication Date: 2016-12-16
    Description: Excited states in the odd-proton nucleus 125 Cs were investigated by means of in-beam γ -ray spectroscopy. The πg 7/2 band is observed to fork into a Δ I = 1 coupled band and a Δ I = 2 decoupled band at high spins. To assign the possible configurations of these two bands, experimental B (M1)/ B (E2) ratios and signature splittings have been evaluated for the Δ I = 1 band, and calculations based on the geometrical model, cranked shell model and total Routhian surfaces model have been performed. They are suggested to be a near-oblate band built on the ( πg 7/2 / d 5/2 ) ⊗ ( νh 11/2 ) 2 configuration and a prolate band built on the πg 7/2 ⊗ ( πh 11/2 ) 2 configuration, respectively.
    Print ISSN: 1674-1137
    Topics: Physics
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  • 5
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    Parametric design and static behavior analysis of single-layer hemi-ellipsoida latticed shell (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-06-03
    Description: The parametric design macro programs of two basic types of single-layer hemi-ellipsoidal latticed shell are developed by using APDL (Ansys Parametric Design Language) parameterized design language. The parametric design of single-layer hemi-ellipsoidal latticed shell structures can be built under the condition of giving the macroscopic geometric parameters such as specifical parameter t, parameter k, span S1, span S2, rise f, valley number Kn, radial node number Nx etc. Ansys software is applied to study comparison of characteristics of the Kewitte type net shell structure of different vector height f, radial node number Nx and boundary constraints. The results show that modeling design of hemi-ellipsoidal latticed shell can be built conveniently and quickly by the application of parametric design of macro program. The three-way grid type is more reasonable force performance, and it’s mechanical performance is better when the span ratio is 1/2. Thus it is suggested to give prior...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 6
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    Phonon chirality tuned through interface transmission in a one-dimensional atomic junction model (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-07-05
    Description: There has been growing interest in revealing exotic properties of chiral phonons since they were found in honeycomb AB lattice, and very recently they were experimentally verified in a tungsten diselenide monolayer (2018 Science 359 579). In this work, we manipulate phonon chirality through interface transmission via a one-dimensional atomic junction model by using the scattering boundary method. Due to the difference of phase change between two transverse directions induced by the anisotropy at interface coupling, the phonon polarization can be tuned between circular and linear in the high-frequency range. In a double-junction atomic model with an anisotropic center, we find that the phase change accumulates when the phonon transmits through the interface material thus the phonon can be tuned between different chirality in the medium frequency range. The phase change is found to linearly depend on the width of the interface material, while the transmission coeffic...
    Electronic ISSN: 1367-2630
    Topics: Physics
    Published by Institute of Physics (IOP)
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