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  • Physik  (9)
  • UA 5534.B  (9)
  • 1
    Online-Ressource
    Online-Ressource
    Evidence for complete low-frequency vibration band gaps in a thick elastic steel metamaterial plate
    World Scientific Pub Co Pte Ltd ; 2019
    In:  Modern Physics Letters B Vol. 33, No. 04 ( 2019-02-10), p. 1950038-
    Details
    In: Modern Physics Letters B, World Scientific Pub Co Pte Ltd, Vol. 33, No. 04 ( 2019-02-10), p. 1950038-
    Kurzfassung: Elastic steel metamaterial plates can be used for noise- and vibration-reduction due to unique physical properties related to their vibration band gap. However, obtaining a complete low-frequency vibration band gap in a thick elastic steel metamaterial plate is difficult. In this paper, we simulate a complete low-frequency vibration band gap in a thick elastic steel metamaterial plate. The structure consists of periodic, double-sided, composite stepped resonators, which were deposited on a 2D locally resonant phononic crystal plate. The phononic crystal plate consists of an array of rubber fillers embedded in a thick steel plate. The dispersion relations, power-transmission spectra, and the displacement fields of the eigenmodes are calculated using the finite-element method. The results show that, for the proposed structure, the opening of the first complete vibration band gap is reduced by a factor of 9.5 compared to a conventional thick elastic steel metamaterial plate. This causes attenuation of low-frequency elastic waves. The formation mechanisms for the vibration band gap are also explored numerically. The results indicate that the formation mechanism for the new low-frequency vibration band gap can be attributed to coupling between a local resonance mode of the composite stepped resonators and the Lamb wave mode of the thick steel-plate. The location of the vibration band gap is determined by the resonator mode of the composite stepped resonators. The vibration band gap effects of the composite stepped resonators are also investigated in this paper. We find that the location of the complete vibration band gaps can be modulated with a relatively low frequency using different composite stepped resonators. Such an elastic steel metamaterial plate with a complete low-frequency vibration band gap can be used to reduce both vibration and noise in various commercial and research applications.
    Materialart: Online-Ressource
    ISSN: 0217-9849 , 1793-6640
    URL: Article
    DOI: 10.1142/S0217984919500386
    RVK:
    UA 5534.B
    Sprache: Englisch
    Verlag: World Scientific Pub Co Pte Ltd
    Publikationsdatum: 2019
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Online-Ressource
    Online-Ressource
    Excellent sensitivity of SnO 2 nanoparticles to formaldehyde
    World Scientific Pub Co Pte Ltd ; 2022
    In:  Modern Physics Letters B Vol. 36, No. 32n33 ( 2022-11-20)
    Details
    In: Modern Physics Letters B, World Scientific Pub Co Pte Ltd, Vol. 36, No. 32n33 ( 2022-11-20)
    Kurzfassung: The room temperature gas sensors have always been an important research direction of the gas sensor, and the room temperature gas sensors without the assistance of the light is more valuable. The SnO 2 nanoparticles were synthesized by hydrothermal method, which showed good formaldehyde sensitivity, had the advantages of low test temperature, only [Formula: see text]C, good formaldehyde selectivity, and especially the good response to formaldehyde at room temperature. The nanostructure and gas-sensing properties were characterized by scanning electron microscopy, EDS mapping, nitrogen physical adsorption, and X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and WS-60B gas-sensing measurement system. Compared with the reported research results, we carefully discuss the physical mechanism of the SnO 2 formaldehyde sensor with low operating temperature and good formaldehyde selectivity in this paper.
    Materialart: Online-Ressource
    ISSN: 0217-9849 , 1793-6640
    URL: Article
    DOI: 10.1142/S0217984922501767
    RVK:
    UA 5534.B
    Sprache: Englisch
    Verlag: World Scientific Pub Co Pte Ltd
    Publikationsdatum: 2022
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Online-Ressource
    Online-Ressource
    Detection of accumulated continuously ethanol concentration by ZnO–SnO 2 composite nanorods sensor
    World Scientific Pub Co Pte Ltd ; 2021
    In:  Modern Physics Letters B Vol. 35, No. 25 ( 2021-09-10), p. 2150395-
    Details
    In: Modern Physics Letters B, World Scientific Pub Co Pte Ltd, Vol. 35, No. 25 ( 2021-09-10), p. 2150395-
    Kurzfassung: ZnO–SnO 2 composite nanorods with rough surfaces were synthesized via a coaxially nested needle electrospinning method. The morphology and nanostructure were characterized by scanning electron microscopy, atomic force microscope, EDS mapping, nitrogen physical adsorption, and X-ray diffraction. The synthesis mechanisms of ZnO–SnO 2 nanorods were discussed, which combined the gas sensitivity advantages of different materials. ZnO–SnO 2 nanorods sensor with good ethanol gas sensitivity achieved accurate measurement of continuous ethanol concentration. The sensor exhibited good selectivity to ethanol in the presence of formaldehyde, methanol, acetone, acetic acid, benzene, and xylene at 290[Formula: see text]C. The response and recovery time to 100 ppm ethanol were about 13 and 35 s, respectively. The energy band, barrier, charge transfer of ZnO–SnO 2 composite material was discussed, and its optimization of gas sensitivity was analyzed in detail.
    Materialart: Online-Ressource
    ISSN: 0217-9849 , 1793-6640
    URL: Article
    DOI: 10.1142/S0217984921503954
    RVK:
    UA 5534.B
    Sprache: Englisch
    Verlag: World Scientific Pub Co Pte Ltd
    Publikationsdatum: 2021
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Online-Ressource
    Online-Ressource
    Petal-like ZnO-based ultra-sensitive ethylene glycol sensors synthesized by solvent regulation
    World Scientific Pub Co Pte Ltd ; 2023
    In:  Modern Physics Letters B
    Details
    In: Modern Physics Letters B, World Scientific Pub Co Pte Ltd
    Kurzfassung: The ZnO-10, ZnO-20, ZnO-30, and ZnO-40 nanopetal-shaped samples were successfully synthesized by a hydrothermal method. The results of XRD, SEM, TEM, and BET indicate that the micro–nano petal-like samples have the advantages of high purity, good crystallinity, and large specific surface area. The ZnO-20 sample with the largest specific surface area and pore volume was prepared by adjusting the scheme without changing the sample morphology. The specific surface area and pore volume of the sample were 33.6914[Formula: see text]m 2 /g and 0.1561[Formula: see text]ml/g. The results of gas sensitivity test show that the sample has the highest response and super good gas sensitivity selectivity. At 250 ∘ C, the responses to 5[Formula: see text]ppm and 50[Formula: see text] ppm ethylene glycol can reach 14.4 and 293, respectively. Because of the excellent gas performance of ZnO nanosheets, this work can provide a theoretical basis for the research and development of ultra-sensitive ethylene glycol gas sensors in the industry.
    Materialart: Online-Ressource
    ISSN: 0217-9849 , 1793-6640
    URL: Article
    DOI: 10.1142/S0217984924500179
    RVK:
    UA 5534.B
    Sprache: Englisch
    Verlag: World Scientific Pub Co Pte Ltd
    Publikationsdatum: 2023
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    Online-Ressource
    Online-Ressource
    OPTIMAL ANTI-CLONING FOR REAL STATE
    World Scientific Pub Co Pte Ltd ; 2008
    In:  Modern Physics Letters B Vol. 22, No. 08 ( 2008-03-30), p. 555-559
    Details
    In: Modern Physics Letters B, World Scientific Pub Co Pte Ltd, Vol. 22, No. 08 ( 2008-03-30), p. 555-559
    Kurzfassung: We present two optimal quantum anti-cloning machines for real state in two dimensions, i.e., input state lying in the x–z equator. The first anti-cloning machine produces two outputs which are orthogonal to the input, and the second one produces two anti-parallel outputs for a single input state. The optimal fidelities are also derived.
    Materialart: Online-Ressource
    ISSN: 0217-9849 , 1793-6640
    URL: Article
    DOI: 10.1142/S0217984908015061
    RVK:
    UA 5534.B
    Sprache: Englisch
    Verlag: World Scientific Pub Co Pte Ltd
    Publikationsdatum: 2008
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Online-Ressource
    Online-Ressource
    Dual-channel high sensitivity photonic crystal fiber sensor based on rectangular air holes
    World Scientific Pub Co Pte Ltd ; 2023
    In:  Modern Physics Letters B
    Details
    In: Modern Physics Letters B, World Scientific Pub Co Pte Ltd
    Kurzfassung: This paper proposes a dual-channel high sensitivity photonic crystal fiber sensor with rectangular air holes, which can detect the refractive index of a single sample or detect the refractive index of two samples simultaneously, to increase the detection efficiency and wavelength sensitivity of the sample refractive index. The sensor can reduce the times of filling, emptying and cleaning of the sample to be tested and save labor and time costs. The finite element method is used to thoroughly analyze the proposed structure’s sensing properties. The results show that when the sensor detects a single sample, the maximum wavelength sensitivity is 67,300[Formula: see text]nm/RIU, and the highest figure of merit (FOM) is 547 RIU[Formula: see text] . When the sensor detects two samples synchronously, the maximum wavelength sensitivity is 64,100[Formula: see text]nm/RIU, which is the highest level among the known sensors of the same kind. It has good application prospect in the field of high sensitivity refractive index detection.
    Materialart: Online-Ressource
    ISSN: 0217-9849 , 1793-6640
    URL: Article
    DOI: 10.1142/S0217984924500283
    RVK:
    UA 5534.B
    Sprache: Englisch
    Verlag: World Scientific Pub Co Pte Ltd
    Publikationsdatum: 2023
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
    Online-Ressource
    Online-Ressource
    CHARACTERIZATION OF POROUS Mg – Zn ALLOY USING X-RAY TOMOGRAPHY AND ITS DRUG-LOADING BEHAVIOR
    World Scientific Pub Co Pte Ltd ; 2013
    In:  Modern Physics Letters B Vol. 27, No. 19 ( 2013-07-30), p. 1341009-
    Details
    In: Modern Physics Letters B, World Scientific Pub Co Pte Ltd, Vol. 27, No. 19 ( 2013-07-30), p. 1341009-
    Kurzfassung: Porous Mg alloys will be promising orthopedic implants materials. In this study, porous Mg – Zn alloy with a porosity of 30% was prepared by powder metallurgy process. XRD was used to examine the composition of the sample and synchrotron radiation-based X-ray micro-computed tomography (SR-μCT) was used to investigate the pore properties of the sample. The results showed that the sample comprised a single Mg phase and a Mg 2 Zn 11 phase. The SR-μCT results showed that the porosity of the sample is about 30% which is approximate to the theoretical porosity. The pore morphology was irregular and the largest pore was about 200 μm in diameter. And a large pore cluster was identified meaning that most of the pores in the sample were interconnected with each other. This is beneficial for the materials transformation after the implantation of the sample in human body, which will boost the bone regeneration. Drug-loading experiment showed that Ibuprofen can be successfully loaded in porous Mg – Zn alloy, which means that porous Mg – Zn alloy could be an orthopedic drug delivery system (DDS).
    Materialart: Online-Ressource
    ISSN: 0217-9849 , 1793-6640
    URL: Article
    DOI: 10.1142/S0217984913410091
    RVK:
    UA 5534.B
    Sprache: Englisch
    Verlag: World Scientific Pub Co Pte Ltd
    Publikationsdatum: 2013
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 8
    Online-Ressource
    Online-Ressource
    The transport phenomenon of inertia Brownian particles in a periodic potential with non-Gaussian noise
    World Scientific Pub Co Pte Ltd ; 2019
    In:  Modern Physics Letters B Vol. 33, No. 02 ( 2019-01-20), p. 1950004-
    Details
    In: Modern Physics Letters B, World Scientific Pub Co Pte Ltd, Vol. 33, No. 02 ( 2019-01-20), p. 1950004-
    Kurzfassung: The transport phenomenon (movement and diffusion) of inertia Brownian particles in a periodic potential with non-Gaussian noise is investigated. It is found that proper noise intensity Q will promote particles directional movement (or diffusion), but large Q will inhibit this phenomenon. For large value of Q, the average velocity [Formula: see text] (or the diffusion coefficient D) has a maximum with increasing correlation time [Formula: see text] . But for small value of Q, [Formula: see text] (or D) decreases with increasing [Formula: see text] . In some cases, for the same value of Q and the same value of [Formula: see text], non-Gaussian noise can induce particles directional movement (or diffusion), but Gaussian colored noise cannot.
    Materialart: Online-Ressource
    ISSN: 0217-9849 , 1793-6640
    URL: Article
    DOI: 10.1142/S0217984919500040
    RVK:
    UA 5534.B
    Sprache: Englisch
    Verlag: World Scientific Pub Co Pte Ltd
    Publikationsdatum: 2019
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    Online-Ressource
    Online-Ressource
    A high-sensitivity dual-sample synchronous detection photonic crystal fiber sensor
    World Scientific Pub Co Pte Ltd ; 2021
    In:  Modern Physics Letters B Vol. 35, No. 18 ( 2021-06-30), p. 2150306-
    Details
    In: Modern Physics Letters B, World Scientific Pub Co Pte Ltd, Vol. 35, No. 18 ( 2021-06-30), p. 2150306-
    Kurzfassung: The photonic crystal fiber (PCF) sensor based on surface plasmon resonance (SPR) technology has flexibility in birefringence, negative dispersion, effective area and nonlinearity and has become a widely studied new fiber. However, there are many problems in the practical application of the sensor, such as complex structure design, not easy to prepare, the low sensitivity of sensing detection, narrow range of refractive index detection of analytes, which greatly limits the application range and functions of PCF sensors. To solve the above problems, this paper adopts a structure with a longer vertical distance between the D-shaped large air hole channel and the core. The energy of the core conduction mode is better limited by the cladding to transmit in the core, and the plasma mode is enhanced, which can effectively increase the wavelength sensitivity. In this paper, the hexagonal double-clad air hole structure and the D-type structure are combined to ensure a simple structure and facilitate manufacturing and production, while the wavelength sensitivity is also greatly improved. The wavelength sensitivity of the dual sample channel can reach up to 16200 nm/RIU and 15800 nm/RIU, which has broad application prospects in the field of high-sensitivity detection.
    Materialart: Online-Ressource
    ISSN: 0217-9849 , 1793-6640
    URL: Article
    DOI: 10.1142/S0217984921503061
    RVK:
    UA 5534.B
    Sprache: Englisch
    Verlag: World Scientific Pub Co Pte Ltd
    Publikationsdatum: 2021
    Standort Signatur Einschränkungen Verfügbarkeit
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