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  • AIP Publishing  (12)
  • 1
    Online Resource
    Online Resource
    Preparation and mechanical properties of modified nanocellulose/PLA composites from cassava residue
    AIP Publishing ; 2018
    In:  AIP Advances Vol. 8, No. 2 ( 2018-02-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 8, No. 2 ( 2018-02-01)
    Abstract: Nanocellulose was prepared by a mechanochemical method using cassava residue as a raw material and phosphoric acid as the auxiliary agent. The prepared nanocellulose was hydrophobically modified with stearic acid to improve its dispersibility. This modified nanocellulose was added to polylactic acid (PLA) film-forming liquids at concentrations of 0%, 0.5%, 1.0%, 1.5% and 2.0%, and the effect of modified nanocellulose on the mechanical properties of polylactic acid (PLA) films were investigated. When at least 0.5% modified nanocellulose is added, more active groups of modified nanocellulose are adsorbed onto the PLA molecular chain. Although the tensile strength of the film is only improved by 13.59%, the flexibility of the film decreases, and the elastic modulus decreases by 28.91%. When 1% modified nanocellulose is added, the modified nanocellulose and PLA are tangled together through molecular chains and they co-crystallize to form a stable network structure. The tensile strength of the nanocomposite films is enhanced by 40.03%, the elastic modulus is enhanced by 55.65%, and the flexibility of the film decreases.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5023278
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2583909-3
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  • 2
    Online Resource
    Online Resource
    Dietary fibres from cassava residue: Physicochemical and enzymatic improvement, structure and physical properties
    AIP Publishing ; 2018
    In:  AIP Advances Vol. 8, No. 10 ( 2018-10-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 8, No. 10 ( 2018-10-01)
    Abstract: In this study, an physico-chemical method and enzymatic improvement were used to extract cassava dietary fiber from cassava residue. α-amylase, glucoamylase, lipase, and protease were added to the physically comminuted cassava residue to remove starch, fat, and protein. Then, with the aid of ultrasound, dietary fiber was bleached with hydrogen peroxide to increase its whiteness. Finally, the cassava dietary fiber was treated with cellulase to increase the amount of soluble dietary fiber. The yield of dietary fiber was 75.63%, 37.55% of which was soluble dietary fiber. Water-holding capacity, water-swelling capacity, and oil-holding capacity of cassava dietary fiber were 4.020 g/g, 2.091 mL/g, and 2.891 g/g, respectively, which were 11.14%, 52.85%, and 9.55% higher than those of raw tapioca. Thus, the physical and chemical properties of the dietary fiber were improved.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5054639
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2583909-3
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  • 3
    Online Resource
    Online Resource
    Raman scattering and thermogravimetric analysis of iodine-doped multiwall carbon nanotubes
    AIP Publishing ; 2002
    In:  Applied Physics Letters Vol. 80, No. 14 ( 2002-04-08), p. 2553-2555
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 80, No. 14 ( 2002-04-08), p. 2553-2555
    Abstract: Iodine-doped multiwall carbon nanotubes (I-MWNTs) were characterized by means of Raman scattering and thermogravimetric analysis. The results show that multiwall carbon nanotubes (MWNTs) can be effectively doped by iodine and exchange electrons with iodine. Iodine atoms form charged polyiodide chains inside tubes of different inner diameter, which is similar to the iodine-doped single-wall carbon nanotubes (I-SWNTs), but can not intercalate into the graphene walls of MWNTs. The Raman scattering behavior of I-MWNTs exhibits some differences from that of I-SWNTs and the low-dimensional conductive hydrocarbon-iodine complex “perylene⋅I2.92.”
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.1468269
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2002
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 4
    Online Resource
    Online Resource
    Thermal behavior of a PV panel integrated with PCM-filled metallic tubes: An experimental study
    AIP Publishing ; 2017
    In:  Journal of Renewable and Sustainable Energy Vol. 9, No. 5 ( 2017-09-01)
    Details
    In: Journal of Renewable and Sustainable Energy, AIP Publishing, Vol. 9, No. 5 ( 2017-09-01)
    Abstract: The current research work aims to maintain high photovoltaic (PV) efficiency by keeping them at low operating temperature. For this purpose, commercially available phase change material (PCM) RT24 encapsulated in copper tubes was attached at the back side of a PV panel as a heat sink. The main concept of using the copper tube as PCM encapsulation is to produce a fin effect on the back of the PV panel to enhance the rate of heat transfer from the PV panel to ambient air. The experimental results showed that a maximum temperature reduction of 8.5 °C can be achieved at the front surface of the PV panel with 2.5 kg of PCM per square meter of the PV panel area. The PV back surface was also cooled down from 62 °C to 56 °C by the PCM. Enhancement in efficiency up to 3% was observed. The fin effect for the PV panel cooling was observed as the PV panel was maintained at a lower temperature, even after the PCM was completely utilized. The total cost incurred for the current PCM-based thermal regulation of the PV panel was $93/m2 of the PV area or $0.60/W of the PV power.
    Type of Medium: Online Resource
    ISSN: 1941-7012
    URL: Article
    DOI: 10.1063/1.4995022
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 2444311-6
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  • 5
    Online Resource
    Online Resource
    An asymptotic-preserving and energy-conserving particle-in-cell method for Vlasov–Maxwell equations
    AIP Publishing ; 2023
    In:  Journal of Mathematical Physics Vol. 64, No. 6 ( 2023-06-01)
    Details
    In: Journal of Mathematical Physics, AIP Publishing, Vol. 64, No. 6 ( 2023-06-01)
    Abstract: In this paper, we develop an asymptotic-preserving and energy-conserving (APEC) Particle-In-Cell (PIC) algorithm for the Vlasov–Maxwell system. This algorithm not only guarantees that the asymptotic limiting of the discrete scheme is a consistent and stable discretization of the quasi-neutral limit of the continuous model but also preserves Gauss’s law and energy conservation at the same time; therefore, it is promising to provide stable simulations of complex plasma systems even in the quasi-neutral regime. The key ingredients for achieving these properties include the generalization of Ohm’s law for electric fields such that asymptotic-preserving discretization can be achieved and a proper decomposition of the effects of the electromagnetic fields such that a Lagrange multiplier method can be appropriately employed for correcting the kinetic energy. We investigate the performance of the APEC method with three benchmark tests in one dimension, including the linear Landau damping, the bump-on-tail problem, and the two-stream instability. Detailed comparisons are conducted by including the results from the classical explicit leapfrog and the previously developed asymptotic-preserving PIC schemes. Our numerical experiments show that the proposed APEC scheme can give accurate and stable simulations of both kinetic and quasi-neutral regimes, demonstrating the attractive properties of the method across scales.
    Type of Medium: Online Resource
    ISSN: 0022-2488 , 1089-7658
    URL: Article
    DOI: 10.1063/5.0126389
    RVK:
    UA 4660
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1472481-9
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  • 6
    Online Resource
    Online Resource
    In-plane anisotropic 2D CrPS4 for promising polarization-sensitive photodetection
    AIP Publishing ; 2021
    In:  Applied Physics Letters Vol. 119, No. 17 ( 2021-10-25)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 119, No. 17 ( 2021-10-25)
    Abstract: Polarized photodetectors have been widely used in military and civilian applications. The investigation of promising two-dimensional materials with low symmetry structures will be of great significance for the development of polarized integrated nanodevices. In this work, chromium thiophosphate (CrPS4), a ternary layered semiconductor with low symmetry puckered structures and unique linear dichroism (LD) conversion behavior is introduced to act as a polarization-sensitive photodetector. Angle-resolved polarized Raman spectra (ARPRS), polarization-resolved photoluminescence (PL) spectra, polarization-resolved absorption spectroscopy (PRAS), and electrical transport measurement systematically indicate intriguing anisotropic optical and electrical properties in 2D (two-dimensional) CrPS4. The photodetector of CrPS4 shows a linear anisotropy ratio of ≈1.33 with 405 nm illumination. This pioneering research not only stimulates interest in the development of novel anisotropic 2D materials but also enriches the family of polarization-sensitive photodetectors.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0066143
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 7
    Online Resource
    Online Resource
    The left-handed property of the composite structure of metallic wires in an anisotropy medium host
    AIP Publishing ; 2009
    In:  Applied Physics Letters Vol. 94, No. 9 ( 2009-03-02)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 94, No. 9 ( 2009-03-02)
    Abstract: The electromagnetic character of the composite structure composed of metallic wires in a homogeneous mu-negative medium was studied using the method of finite difference time domain. Under the condition of transverse electromagnetic or transverse electric wave, left-handed material (LHM) can be made if the medium has proper anisotropic negative permeability. Negative permeability along H⃗ of wave is the necessary and sufficient condition for LHM. Permeability along E⃗ of wave plays no role in realizing LHM, while negative permeability along k⃗ destroys the left-handed property. It gives a clear direction to produce LHM using uniaxial or gyrotropic medium.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3093800
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 8
    Online Resource
    Online Resource
    Achieving higher thermoelectric performance for p-type Cr2Ge2Te6 via optimizing doping
    AIP Publishing ; 2018
    In:  Applied Physics Letters Vol. 113, No. 26 ( 2018-12-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 113, No. 26 ( 2018-12-24)
    Abstract: Cr2Ge2Te6-based compounds with a layered structure and high symmetry hold a great promise for thermoelectric applications. Our studies have been committed to improve their electrical properties considering the low power factor of only ∼0.23 mW/mK2 in pristine samples. In this work, various doping contents on the site that has less influence on the charge-conducting band have been investigated to enhance the power factor. The results show that Fe-doping is the most favorable among elements we applied. According to the first-principles calculation, the Fe doping on the Cr site leads to the increment of the density of states around the Fermi level. By tuning the carrier concentration via Fe doping, the peak power factor rises from 0.23 mW/mK2 to 0.37 mW/mK2 and zT rises from 0.3 to 0.4 at 830 K for Cr1.9Fe0.1Ge2Te6 along the pressing direction. These results shed lights for designing high performance thermoelectric materials.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5064787
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 9
    Online Resource
    Online Resource
    Left-handed behavior and low-loss passband in a ferromagnetic sandwich structure
    AIP Publishing ; 2009
    In:  Applied Physics Letters Vol. 95, No. 11 ( 2009-09-14)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 95, No. 11 ( 2009-09-14)
    Abstract: The electromagnetic properties of a ferromagnetic-dielectric-ferromagnetic sandwich structure were studied by experiment and simulation. In the transmission spectra, an obvious passband emerges in the broad forbidden band of ferromagnetic resonance because the strong coupling of two resonating ferrite slabs excites a propagating mode. The passband has ultralow loss (∼−1 dB) due to the feature of surface wave and the bias magnetic field pump. A negative phase evolution of propagating wave occurs in the second slab only based on the magnetic resonance. The ultralow insertion loss of passband and magnetotunability endow the sandwich structure a promising application future.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3233899
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
    Online Resource
    Online Resource
    The study of three-dimensional temperature field distribution reconstruction using ultrasonic thermometry
    AIP Publishing ; 2016
    In:  AIP Advances Vol. 6, No. 7 ( 2016-07-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 6, No. 7 ( 2016-07-01)
    Abstract: As an efficient technique, microwave heating is applied for various thermal processes in recent years. Information of temperature field distribution is important to security and stability in the process of microwave heating. In this paper, we investigate a three-dimensional temperature field distribution reconstruction algorithm using ultrasonic thermometry. Four three-dimensional temperature field distribution models with different complex levels are used in the simulation experiments. The error analysis between the temperature field distribution models and the reconstructed ones indicates that the proposed reconstruction algorithm possesses high reconstruction precision.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.4958922
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 2583909-3
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