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  • Articles  (651)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (651)
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  • Articles  (651)
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  • 1
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    Tailoring the nature and strength of electron–phonon interactions in the SrTiO3(001) 2D electron liquid (2016)
    Springer Nature
    Details
    Publication Date: 2016-07-23
    Description: Nature Materials 15, 835 (2016). doi:10.1038/nmat4623 Authors: Z. Wang, S. McKeown Walker, A. Tamai, Y. Wang, Z. Ristic, F. Y. Bruno, A. de la Torre, S. Riccò, N. C. Plumb, M. Shi, P. Hlawenka, J. Sánchez-Barriga, A. Varykhalov, T. K. Kim, M. Hoesch, P. D. C. King, W. Meevasana, U. Diebold, J. Mesot, B. Moritz, T. P. Devereaux, M. Radovic & F. Baumberger Surfaces and interfaces offer new possibilities for tailoring the many-body interactions that dominate the electrical and thermal properties of transition metal oxides. Here, we use the prototypical two-dimensional electron liquid (2DEL) at the SrTiO3(001) surface to reveal a remarkably complex evolution of electron–phonon coupling with the tunable carrier density of this system. At low density, where superconductivity is found in the analogous 2DEL at the LaAlO3/SrTiO3 interface, our angle-resolved photoemission data show replica bands separated by 100 meV from the main bands. This is a hallmark of a coherent polaronic liquid and implies long-range coupling to a single longitudinal optical phonon branch. In the overdoped regime the preferential coupling to this branch decreases and the 2DEL undergoes a crossover to a more conventional metallic state with weaker short-range electron–phonon interaction. These results place constraints on the theoretical description of superconductivity and allow a unified understanding of the transport properties in SrTiO3-based 2DELs.
    Print ISSN: 1476-1122
    Electronic ISSN: 1476-4660
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Natural Sciences in General , Physics
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  • 2
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    Research on the two-phase flow and separation mechanism in the oil-gas cyclone separator (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-08-11
    Description: The cyclone separator has attracted increasing attention due to its small size, rapid construction and high separation efficiency. This study investigated its gas-liquid two-phase flow and separation characteristics experimentally and numerically. A numerical model of two- phase flow in the cyclone separator was proposed using the Euler-Lagrange method. The distribution of pressure, tangential and axial velocity in the gas-phase flow field was obtained, and the oil droplet movement was traced. Separation efficiency was also studied experimentally, and the diameter distributions of oil droplets at the inlet and the outlet of the separator were measured by a Malvern laser particle size analyser to verify the simulation model. Based on high-speed photography technology, the oil film distribution and flow pattern on the wall of the cyclone separator were visualised. The variation of oil-gas two-phase flow in the cyclone separator was compared under various inlet flow rates. Based on ...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 3
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    Spectroscopic evidence for negative electronic compressibility in a quasi-three-dimensional spin–orbit correlated metal (2015)
    Springer Nature
    Details
    Publication Date: 2015-05-21
    Description: Nature Materials 14, 577 (2015). doi:10.1038/nmat4273 Authors: Junfeng He, T. Hogan, Thomas R. Mion, H. Hafiz, Y. He, J. D. Denlinger, S-K. Mo, C. Dhital, X. Chen, Qisen Lin, Y. Zhang, M. Hashimoto, H. Pan, D. H. Lu, M. Arita, K. Shimada, R. S. Markiewicz, Z. Wang, K. Kempa, M. J. Naughton, A. Bansil, S. D. Wilson & Rui-Hua He Negative compressibility is a sign of thermodynamic instability of open or non-equilibrium systems. In quantum materials consisting of multiple mutually coupled subsystems, the compressibility of one subsystem can be negative if it is countered by positive compressibility of the others. Manifestations of this effect have so far been limited to low-dimensional dilute electron systems. Here, we present evidence from angle-resolved photoemission spectroscopy (ARPES) for negative electronic compressibility (NEC) in the quasi-three-dimensional (3D) spin–orbit correlated metal (Sr1−xLax)3Ir2O7. Increased electron filling accompanies an anomalous decrease of the chemical potential, as indicated by the overall movement of the deep valence bands. Such anomaly, suggestive of NEC, is shown to be primarily driven by the lowering in energy of the conduction band as the correlated bandgap reduces. Our finding points to a distinct pathway towards an uncharted territory of NEC featuring bulk correlated metals with unique potential for applications in low-power nanoelectronics and novel metamaterials.
    Print ISSN: 1476-1122
    Electronic ISSN: 1476-4660
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Natural Sciences in General , Physics
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  • 4
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    Effect of pure β-Si 3 N 4 powder on microstructure and mechanical properties of porous Si 3 N 4 ceramics (2011)
    Institute of Physics (IOP)
    Details
    Publication Date: 2011-04-08
    Description: Porous Si 3 N 4 ceramics were produced by the initial Si 3 N 4 powder added different amounts of β-Si 3 N 4 powder. The density, porosity and flexural strength were tested by the methods of Archimedes method and three-point bending measurements, respectively. Phase composition and microstructure of Si 3 N 4 ceramics were studied by X-ray diffraction and scanning electron microscopy. Fibrous β-Si 3 N 4 grains developed in the porous microstructure. The grain morphology and size were affected by adding different amounts of β-Si 3 N 4 powder. Fibrous β-Si 3 N 4 grains dispersed in the porous Si 3 N 4 ceramics uniformly with the length of 4~10μm, the average diameter of 0.6μm and average aspect ratio of 7 were obtained. Adding 3 mass% β-Si 3 N 4 powder, porous Si 3 N 4 ceramics with excellent pro...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 5
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    Research on estimating method for the smart electric energy meter’s error based on parameter degradation model (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-06-16
    Description: The performance of the smart electric energy meter deteriorates during the operation, which will affects the accuracy of energy metering. In order to estimate the smart meter’s error during the operation, a method based on parameter degradation model is proposed. The meter’s degradation parameters and degradation acting parameters are determined, aiming at building parameter degradation model and putting forward error estimation constraint. Big data analysis methods are adopted in the process of solving degradation network. As the data are of multiple categories and data changing rates are variable, pre-processing method of differential normalized data is employed. Additionally, feed-forward neural network is adopted to approximate degradation characteristics, because elementary function is incapable of describing degradation network. Therefore, the smart meter’s error can be estimated according to the error estimation constraint, assuming degradation acting parameters pre-deter...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 6
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    Study on vibration extraction and control characteristics of the high speed spindle online dynamic (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-09-20
    Description: In order to solve the mechanical spindle low processing accuracy and precision elements problems which were caused by high speed spindle noise and vibration, a robust and reliable vibration extraction and control scheme of mechanical spindle was proposed. Based on the electromagnetic balancing system and by applying LabV1EW visual instrument, high speed spindle noise reduction and vibration signals filtering were pre- processed and vibration signals sampling, quantization, interception were post-processed. Base frequency vibration signals amplitude and phase were extracted by using different signal extraction methods. Through experiment verification and comparative analysis, the optimal vibration signal amplitude and phase extraction method was selected. By using the influence coefficient method, the influential factors including spindle speed, trial weights magnitude and phase were analysed. The high speed spindle unbalance was calculated and compensated. The high speed spindle...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 7
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    An efficient synthesis of 3,4-Dihydrofuro [3,4-B] [1,4] dioxepine-6,8-dicarboxylic Acid (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-02-14
    Description: As a class of important conjugated polymers, electroluminescent material of polyfuran possess a lot of merits, including good stability, structure is easy to be modified and controllable electrochemical properties. This study uses ethylene diglycol, diethyl oxalate, 1,3- dibromopropane and so on as raw materials to synthesize 3, 4 - ethylenedioxy furan monomer and similar derivatives via oxidation, acetylation, hydrolysis and elimination reaction, etc.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 8
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    Carbon materials derived from rice husks at low and high temperatures (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-07-08
    Description: Rice husk (RH) can be classified as an agriculture residue, majorly produced from by-product of rice milling industries. However, RHs are only mainly utilized for low value energy resource. A great number of researches and innovations have shown that heat treated RHs can turn into valuable carbon materials. In this study, the RHs were carbonized at 800°C and 2500°C, respectively. Their structure, morphology, elemental composition, and quality were characterized using transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. The carbon materials obtained from low and high temperature carbonization processes showed different characteristics. High purity and crystallinity of carbon materials were obtained from RHs carbonized at 2500°C. Furthermore, from Raman results, RHs carbonized at 2500°C exhibited low D/G ratio. This further reveals that the RHs carbonized at 2500°C possess minimal defects. The unique characteristics of RHs carbonized at high ...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 9
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    Optimization of Formulation Technology for Gastric Floating Tablets of total alkaloids from Chelidonium majus L . (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-08-04
    Description: In this paper, the formulation technology of gastric floating tablets of total alkaloids from Chelidonium majus (TAC) was optimized according to its behavior of floating and the release characteristics. Gastric floating tablets were prepared by direct compression with dry powder. The floating time and release performance were used as indexes to evaluate and optimize the formulation. Single factor tests and orthogonal tests were carried out to optimize formulation parameters which impacted properties of TAC gastric floating tablets. The optimal prescription processes were 20% of total alkaloid extracts from Chelidonium majus L. , 15 % HPMCK 15M , 15 % NaHCO 3 and 50 % microcrystalline cellulose PH-101 (MCC). The average release of the drug within 12h was 91.23%, the floating time was 3s, and the duration time was over 12h. In conclusion, the TAC gastric floating tablets prepared by the optimized orthogonal test showed a good floating performance wi...
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 10
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    Research on Modeling Technology of Virtual Robot Based on LabVIEW (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-12-22
    Description: Because of the dangerous working environment, the underwater operation robot for nuclear power station needs manual teleoperation. In the process of operation, it is necessary to guide the position and orientation of the robot in real time. In this paper, the geometric modeling of the virtual robot and the working environment is accomplished by using SolidWorks software, and the accurate modeling and assembly of the robot are realized. Using LabVIEW software to read the model, and established the manipulator forward kinematics and inverse kinematics model, and realized the hierarchical modeling of virtual robot and computer graphics modeling. Experimental results show that the method studied in this paper can be successfully applied to robot control system.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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