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  • AIP Publishing  (9)
  • 1
    Online Resource
    Online Resource
    Two-dimensional displacement measurement based on two parallel gratings
    AIP Publishing ; 2018
    In:  Review of Scientific Instruments Vol. 89, No. 6 ( 2018-06-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 89, No. 6 ( 2018-06-01)
    Abstract: In this paper, a two-dimensional (2-D) planar encoder based on two parallel gratings, which includes a scanning grating and scale grating, is presented. The scanning grating is a combined transmission rectangular grating comprised of a 2-D grating located at the center and two one-dimensional (1-D) gratings located at the sides. The grating lines of the two 1-D gratings are perpendicular to each other and parallel with the 2-D grating lines. The scale grating is a 2-D reflective-type rectangular grating placed in parallel with the scanning grating, and there is an angular difference of 45° between the grating lines of the two 2-D gratings. With the special structural design of the scanning grating, the encoder can measure the 2-D displacement in the grating plane simultaneously, and the measured interference signals in the two directions are uncoupled. Moreover, by utilizing the scanning grating to modulate the phase of the interference signals instead of the prisms, the structure of the encoder is compact. Experiments were implemented, and the results demonstrate the validity of the 2-D planar grating encoder.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.5024637
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 2
    Online Resource
    Online Resource
    Tip-induced flexoelectricity, polar vortices, and magnetic moments in ferroelastic materials
    AIP Publishing ; 2021
    In:  Journal of Applied Physics Vol. 129, No. 8 ( 2021-02-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 129, No. 8 ( 2021-02-28)
    Abstract: Flexoelectricity in twinned ferroelastic thin films generates polarity inside twin walls. The electrical dipoles are typically aligned parallel to twin walls while out-of-plane dipoles are induced elastically by an atomic force microscopy (AFM) tip or by atomic steps in the substrate. Molecular dynamics modeling shows that the out-of-plane dipoles form polar vortex structures next to the domain walls. Flexoelectricity, e.g., by moving AFM tips, produces displacement currents inside these vortices. We estimate that these displacement currents generate magnetic fields with moments in the order of 10−9 μB per atomic layer.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0039509
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 3
    Online Resource
    Online Resource
    Upgrading optical information of rotating mirror cameras
    AIP Publishing ; 2014
    In:  Review of Scientific Instruments Vol. 85, No. 11 ( 2014-11-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 85, No. 11 ( 2014-11-01)
    Abstract: To date, rotating mirror (RM) cameras still serve as indispensable imaging equipment for the diagnosis of microsecond transient processes due to their excellent characteristics. This paper, for upgrading the optical information capacity of the cameras, presents the new optical acceleration principle to increase the framing frequency or scanning velocity, the new design theory without principle errors instead of the classical theories with some flaws in principle to have applied to design our simultaneous streak and framing rotating mirror camera with continuous access, and the new rotating mirror with novel structure, made of an aluminum alloy, to have considerably reduced lateral deformation of the RM and improved the performance of the camera.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.4900404
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 4
    Online Resource
    Online Resource
    Fluorination-induced magnetism in boron nitride nanotubes from ab initio calculations
    AIP Publishing ; 2008
    In:  Applied Physics Letters Vol. 92, No. 10 ( 2008-03-10)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 92, No. 10 ( 2008-03-10)
    Abstract: Ab initio calculations were conducted to investigate the electronic structures and magnetic properties of fluorinated boron nitride nanotube (F-BNNT). It was found that the chemisorption of F atoms on the B atoms of BNNT can induce spontaneous magnetization, whereas no magnetism can be produced when the B and N atoms are equally fluorinated. This provides a different approach to tune the magnetic properties of BNNTs as well as a synthetic route toward metal-free magnetic materials.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2894507
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    All-optical separation of chiral nanoparticles on silicon-based microfluidic chips with vector exceptional points
    AIP Publishing ; 2023
    In:  APL Photonics Vol. 8, No. 3 ( 2023-03-01)
    Details
    In: APL Photonics, AIP Publishing, Vol. 8, No. 3 ( 2023-03-01)
    Abstract: Surface-enhanced all-optical separation of chiral molecules plays an important role in the field of chiral recognition. However, the originally designed photonic micro/nano-structures are always suffering from a lot of limitations, such as low strengths of chiral optical forces, limited spatial resolutions, and narrow separation areas. Here, we theoretically design a silicon-based microfluidic chip to achieve highly efficient separations of chiral nanoparticles. By breaking the mirror-symmetry of a pair of lossy waveguides, two original orthogonal modes are coupled with each other, triggering the formation of a vector exceptional point. Numerical simulations clearly show that the superchiral gradient field can be generated in the microfluidic chip assisted by the vector exceptional point. Such a surface-enhanced chiral gradient field can induce extremely strong chiral gradient forces, pushing nanoparticles with opposite chirality toward different sides of the extended slot. Furthermore, we construct cascade vector exception points in a single microfluidic chip to fulfill the chiral separation with a larger spatial distance. Based on particle tracking simulations, we numerically demonstrate the feasibility and efficiency of our designed microfluidic chips under the influence of the thermal motion of nanoparticles. Our work proposes an efficient way of separating enantiomers in microfluidic chips with high spatial resolution, and shows an exciting prospect for next-generation chiral separation technologies.
    Type of Medium: Online Resource
    ISSN: 2378-0967
    URL: Article
    DOI: 10.1063/5.0138174
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2857268-3
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  • 6
    Online Resource
    Online Resource
    Piezoelectricity and electrostriction in ferroelastic materials with polar twin boundaries and domain junctions
    AIP Publishing ; 2019
    In:  Applied Physics Letters Vol. 114, No. 20 ( 2019-05-20)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 114, No. 20 ( 2019-05-20)
    Abstract: Weak piezoelectricity, compared with electrostriction, occurs in twinned ferroelastic materials even when the uniform bulk material is centro-symmetric. In a simple computer simulation, polarity is exclusively generated by the flexoelectric effect. Simple twinned structures (parallel twin walls) are electrostrictive and show no piezoelectricity. Complex twinned structures break inversion symmetry by the simultaneous appearance of junctions, kinks, needle domains, etc. Such structures show weak piezoelectricity (d ∼ 10−4 pm/V) under periodic boundary conditions together with significant electrostriction. The macroscopic piezoelectric response is stronger (d ∼ 10−3 pm/V) under free boundary conditions due to the effect of relaxing surfaces.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5092523
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 7
    Online Resource
    Online Resource
    Movement of oxygen vacancies in oxide film during annealing observed by an optical reflectivity difference technique
    AIP Publishing ; 2007
    In:  Journal of Applied Physics Vol. 102, No. 5 ( 2007-09-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 102, No. 5 ( 2007-09-01)
    Abstract: The monolayer growth of Nb-doped SrTiO3 on SrTiO3 (100) substrate is prepared by a pulsed laser deposition method. The growth and annealing of the film in vacuum and in oxygen ambient are monitored in real time by an oblique-incidence optical reflectivity difference (OIRD) technique and reflection high-energy electron diffraction technique. The films annealed in different ambient result in different optical annealing signals. From the comparison of experimental OIRD signals with the simulation of OIRD signals, we prove that the optical technique can easily tell whether the oxygen vacancies are moving into or moving out of the film during the annealing. The optical signals are found to be composed of contributions from step edges and terraces.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.2776375
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 8
    Online Resource
    Online Resource
    Field weakening capability investigation of an axial flux permanent-magnet synchronous machine with radially sliding permanent magnets used for electric vehicles
    AIP Publishing ; 2012
    In:  Journal of Applied Physics Vol. 111, No. 7 ( 2012-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 111, No. 7 ( 2012-04-01)
    Abstract: Due to the advantage of high power density compared with the conventional radial flux machines, the axial flux permanent-magnet synchronous machines (PMSMs) are very suitable candidates for the power train of electric vehicles (EVs). In this paper, a new axial flux PMSM adopting radially sliding permanent magnets (PMs) to fulfill field-weakening control and to improve the operating speed range is investigated. The field-weakening structure and principle of the axial flux PMSM with radially sliding PMs are proposed and analyzed. The influence of radially sliding PMs on electromagnetic performances and parameters is analyzed based on FEM. The field-weakening method with radially sliding PMs, which is a mechanical method, is compared and combined with traditional electrical method. Due to the optimized combination of the two methods, the field-weakening capability of the machine is much improved and the maximum speed can reach up to six times of the base speed with constant power, which is very satisfying for EV drive application.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3676230
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 9
    Online Resource
    Online Resource
    Method for reducing waveform distortion by increasing damping strength for electromagnetic vibrators
    AIP Publishing ; 2021
    In:  AIP Advances Vol. 11, No. 3 ( 2021-03-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 11, No. 3 ( 2021-03-01)
    Abstract: Voice coil motors are frequently used as force drivers in electromagnetic vibrators. As a constant current is applied, the generated driving force is not constant but varies with displacement due to the inhomogeneous magnetic field within the stroke range. When a sinusoidal current is applied to the voice coil motors, the above effect can lead to a severe waveform distortion on the output acceleration. In order to find an effective method to reduce it, a general nonlinear dynamic model has been established and analyzed with a focus on the effect of the damping strength of the vibrator on the waveform distortion. The numerical calculations show that the waveform distortion can be efficiently reduced by increasing the damping strength under various working conditions. Based on these results, an eddy current damper (ECD) was designed with a maximized damping coefficient and applied to our home-made vibrator. Once the ECD is incorporated, the waveform distortion of the output acceleration is significantly reduced, which validates our modeling.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0029581
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2583909-3
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