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  • 1
    Online Resource
    Online Resource
    Operation and performance of the ATLAS semiconductor tracker in LHC Run 2
    IOP Publishing ; 2022
    In:  Journal of Instrumentation Vol. 17, No. 01 ( 2022-01-01), p. P01013-
    Details
    In: Journal of Instrumentation, IOP Publishing, Vol. 17, No. 01 ( 2022-01-01), p. P01013-
    Abstract: The semiconductor tracker (SCT) is one of the tracking systems for charged particles in the ATLAS detector. It consists of 4088 silicon strip sensor modules. During Run 2 (2015–2018) the Large Hadron Collider delivered an integrated luminosity of 156 fb -1 to the ATLAS experiment at a centre-of-mass proton-proton collision energy of 13 TeV. The instantaneous luminosity and pile-up conditions were far in excess of those assumed in the original design of the SCT detector. Due to improvements to the data acquisition system, the SCT operated stably throughout Run 2. It was available for 99.9% of the integrated luminosity and achieved a data-quality efficiency of 99.85%. Detailed studies have been made of the leakage current in SCT modules and the evolution of the full depletion voltage, which are used to study the impact of radiation damage to the modules.
    Type of Medium: Online Resource
    ISSN: 1748-0221
    URL: Article
    DOI: 10.1088/1748-0221/17/01/P01013
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2235672-1
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  • 2
    Online Resource
    Online Resource
    Electrically sintered silver nanowire networks for use as transparent electrodes and heaters
    IOP Publishing ; 2019
    In:  Materials Research Express Vol. 6, No. 11 ( 2019-10-18), p. 116316-
    Details
    In: Materials Research Express, IOP Publishing, Vol. 6, No. 11 ( 2019-10-18), p. 116316-
    Type of Medium: Online Resource
    ISSN: 2053-1591
    URL: Article
    DOI: 10.1088/2053-1591/ab47e0
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2760382-9
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  • 3
    Online Resource
    Online Resource
    An ultra wideband (UWB) localization system for automatic guided vehicles (agvs) in smart warehouses
    IOP Publishing ; 2023
    In:  Journal of Physics: Conference Series Vol. 2580, No. 1 ( 2023-09-01), p. 012032-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2580, No. 1 ( 2023-09-01), p. 012032-
    Abstract: As the main component of indoor positioning technology, UWB technology plays an important role in promoting the development of indoor and outdoor seamless positioning technology. This paper presents a proposed localization system of a propagation channel measurement campaign performed in a smart warehouse environment whose dimension is 100 meters * 100 meters and provides an extensive model for this environment. Three different arrangements of basestations are simulated to analyze the effects of basestation constellations and virtual racks are set up to determine the approximate line-of-sight (LOS) probability. At the same time, by considering the influences of varying transmit power, using weighting and using two-way ranging, the distribution of errors and the reliability threshold are drawn and the required bandwidths are determined. Finally, according to the simulation results, the optimal layout and modulation parameters are recommended, and improvements in channel models and algorithms for future work are concluded.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/2580/1/012032
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2166409-2
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  • 4
    Online Resource
    Online Resource
    Research on Typical Architecture and Application of Distribution Internet of Things Based on Blockchain
    IOP Publishing ; 2020
    In:  Journal of Physics: Conference Series Vol. 1621, No. 1 ( 2020-08-01), p. 012095-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1621, No. 1 ( 2020-08-01), p. 012095-
    Abstract: The new round of energy reform is marked by large-scale development and utilization of new energy and re-electrification as the fundamental path, to cope with the pressure of absorbing renewable energy and stupendous access to variable loads such as electric vehicle charging piles creates several problems such as a large number of equipment failure and low standardization in the distribution network, to overcome this, the distribution Internet of Things (D-IoT) came into existence. In this paper an equivalent architecture of blockchain and D-IoT is built based on master-slave multi-chain. The combined equivalent architecture proposes the crucial application of blockchain technologies as consensus mechanism and smart contract in the D-IoT in order to explore the broad application prospects of blockchain in the D-IoT.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1621/1/012095
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2166409-2
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  • 5
    Online Resource
    Online Resource
    Improving Land Vehicle Gravimetry Using a New SINS/GNSS/VEL Method
    IOP Publishing ; 2020
    In:  IOP Conference Series: Earth and Environmental Science Vol. 513, No. 1 ( 2020-06-01), p. 012054-
    Details
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 513, No. 1 ( 2020-06-01), p. 012054-
    Abstract: GNSS plays a key role in land vehicle gravimetry. However, GNSS is unstable due to the influence of the observation environment, which adversely affects the gravimetry accuracy. The velometer can get rid of the restrictions on the use of GNSS by land vehicle gravimetry. In this paper, a SINS/GNSS/VEL method is proposed. This method uses both centralized filtering and federated filtering methods to process the gravity data. Based on the SGA-WZ02 strapdown gravimeter developed by the National University of Defense Technology (NUDT), the vehicle gravimetry test was carried out on a road of approximately 37 kilometers in east Changsha. The test consists of 4 lines in the south-north direction with an average speed of 40 km/h. Compared with traditional SINS/GNSS method, the accuracy of repeated lines using the centralized filtering method improves from 1.58mGal to 1.37mGal, and the external accuracy improves from 2.31mGal to 2.19mGal with a resolution of 2 km. Using federal filtering method, the internal accuracy is 1.36mGal and the external accuracy is 2.22mGal. It indicates that these two methods proposed could both improve the accuracy of gravimetry compared with the traditional SINS/GNSS method. Meanwhile, with adding the external sensor observation, these methods can improve the stability of gravimetry especially for practical survey operations that will save cost and improve efficiency. Finally, several discussions are proposed on the applicability and further improvement of the method.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    URL: Article
    DOI: 10.1088/1755-1315/513/1/012054
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2434538-6
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  • 6
    Online Resource
    Online Resource
    A geomagnetic vector evolutionary compensation method using Woodbury equation
    IOP Publishing ; 2024
    In:  Measurement Science and Technology Vol. 35, No. 2 ( 2024-02-01), p. 025029-
    Details
    In: Measurement Science and Technology, IOP Publishing, Vol. 35, No. 2 ( 2024-02-01), p. 025029-
    Abstract: High-accuracy geomagnetic vector measurements inevitably suffer from the magnetic interference derived from ferromagnetic materials and electric equipment. Traditionally, to eliminate the influence of magnetic interference, a compensation process can be implemented to estimate the interference parameters that contain hard-iron and soft-iron parameters. The traditional compensation method did not consider the situation where the interference parameters would vary over time due to the change in magnetic properties. To overcome this problem, we proposed an evolutionary compensation method based on the Woodbury equation. Using this approach, the interference parameters can be iteratively updated during the measurement process by combining the previous information and the latest measurement data. Both simulation and experimentation were undertaken to evaluate the effectiveness of our proposed approach. The results demonstrate that the proposed method is successful in minimizing the impact of magnetic interference variations. The experiment shows that the RMS errors of geomagnetic filed total intensity and three components can be decreased from 4042.57 nT, 1425.84 nT, 5342.40 nT, and 2921.34 nT to 170.57 nT, 58.39 nT, 207.99 nT and 137.75 nT respectively by traditional method, while with evolutionary method the errors can be reduced to 47.37 nT, 16.19 nT, 57.61 nT and 38.38 nT respectively.
    Type of Medium: Online Resource
    ISSN: 0957-0233 , 1361-6501
    URL: Article
    DOI: 10.1088/1361-6501/ad0ca8
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2024
    detail.hit.zdb_id: 1362523-8
    detail.hit.zdb_id: 1011901-2
    SSG: 11
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  • 7
    Online Resource
    Online Resource
    Research on Security Control Mechanism of Power Distribution IoT Based on Trusted Computing
    IOP Publishing ; 2020
    In:  Journal of Physics: Conference Series Vol. 1639, No. 1 ( 2020-10-01), p. 012085-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1639, No. 1 ( 2020-10-01), p. 012085-
    Abstract: Performing an in-depth study on the Power Internet of Things (IoT), it is known that the distribution network faces higher security risks due to a large number of terminals, various types of equipment, and the flexible access of each device to the distribution network structure and dynamic boundary. Therefore, it is urgent to make significant research on the security control mechanism for the power distribution Internet of Things, to realize the safe access of IoT devices in the Power IoT. Firstly, this paper analyses the shortage of power system security under the background of the IoT. Secondly, trusted computing technology is represented by the TrustZone and is deeply studied, and the feasibility of its application for the security of power distribution IoT is analyzed. Furthermore, the TrustZone-based security management and control architecture for power distribution novel IoT equipment is proposed, and its integrity measurement and trusted network connection process are analyzed. Finally, the security of this architecture is analyzed briefly.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1639/1/012085
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2166409-2
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  • 8
    Online Resource
    Online Resource
    Depth profiled polarization effects in AlGaN quantum wells probed with interconnected cathodoluminescence spectroscopy and ion sputtering
    IOP Publishing ; 2022
    In:  Applied Physics Express Vol. 15, No. 7 ( 2022-07-01), p. 072006-
    Details
    In: Applied Physics Express, IOP Publishing, Vol. 15, No. 7 ( 2022-07-01), p. 072006-
    Abstract: Based on interconnected ion sputtering and cathodoluminescence spectroscopy, an optical spectroscopic strategy has been developed to profile depth-dependent polarization effects in an AlGaN multiple-quantum-well structure. Two emission bands at about 258 nm and 315 nm have been identified to originate from the quantum wells and Ga-rich domains, respectively, and their depth-dependent spectral characteristics reveal that the spontaneous polarization dominates the piezoelectric polarization in the quantum wells, and the emission wavelengths vary with respect to the etching depth due to interactions of the spontaneous polarization field with the piezoelectric polarization field and the surface charge induced electric field.
    Type of Medium: Online Resource
    ISSN: 1882-0778 , 1882-0786
    URL: Article
    DOI: 10.35848/1882-0786/ac75ab
    RVK:
    UA 2244
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2417569-9
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  • 9
    Online Resource
    Online Resource
    Analysis of the thermodynamic disequilibrium loss of the two-phase expansion process and its influence on the performance of a reciprocating expander
    IOP Publishing ; 2019
    In:  IOP Conference Series: Materials Science and Engineering Vol. 604, No. 1 ( 2019-08-01), p. 012041-
    Details
    In: IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 604, No. 1 ( 2019-08-01), p. 012041-
    Abstract: The screw expander and the reciprocating expander were considered as the suitable technologies to be employed as two-phase expanders of the Trilateral Flash Cycle (TFC) systems. The two-phase expansion process in the screw expander could be approximately viewed as the thermodynamic equilibrium process due to the strong disturbing and mixing between the two-phase working fluids in the chamber volume. However, for the reciprocating expander, the situation was different. The flashed vapor in the reciprocating expander cylinder was separated from liquid in the flash chamber, which would result in a significant thermodynamic disequilibrium loss. To assess this loss, the thermodynamic equilibrium model (TEM) and the flash vaporization model (FVM) were simultaneously proposed in this paper. Water was used as the two-phase working fluid. The two-phase expansion processes, the isentropic efficiencies and the output expansion works of the two models were obtained. Predicted results were analyzed and compared under different rotation speeds and injection temperatures. The results showed that when rotation speed of the expander was increased from 50 r/min to 1000 r/min, the thermodynamic disequilibrium loss was approximately increased from 5.3% to 6.3%, and when injection temperature was decreased from 523.15 K to 473.15 K, the thermodynamic disequilibrium loss was approximately increased from 4.5% to 6.2%.
    Type of Medium: Online Resource
    ISSN: 1757-8981 , 1757-899X
    URL: Article
    DOI: 10.1088/1757-899X/604/1/012041
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2506501-4
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  • 10
    Online Resource
    Online Resource
    Flexible and disposable gold nanoparticles-N-doped carbon-modified electrochemical sensor for simultaneous detection of dopamine and uric acid
    IOP Publishing ; 2021
    In:  Nanotechnology Vol. 32, No. 6 ( 2021-02-05), p. 065502-
    Details
    In: Nanotechnology, IOP Publishing, Vol. 32, No. 6 ( 2021-02-05), p. 065502-
    Abstract: Catalytic and electrocatalytic applications of supported metal nanoparticles are hindered due to an aggregation of metal nanoparticles and catalytic leaching under harsh operations. Hence, stable and leaching free catalysts with high surface area are extremely desirable but also challenging. Here we report a gold nanoparticles-hosted mesoporous nitrogen doped carbon matrix, which is prepared using bovine serum albumin (BSA) through calcination. BSA plays three roles in this process as a reducing agent, capping agent and carbon precursor, hence the protocol exhibits economic and sustainable. Gold nanoparticles at N-doped BSA carbon (AuNPs@NBSAC)-modified three-electrode strip-based flexible sensor system has been developed, which displayed effective, sensitive and selective for simultaneous detection of uric acid (UA) and dopamine (DA). The AuNPs@NBSAC-modified sensor showed an excellent response toward DA with a linear response throughout the concentration range from 1 to 50 μ M and a detection limit of 0.05 μ M. It also exhibited an excellent response toward UA, with a wide detection range from 5 to 200 μ M as well as a detection limit of 0.1 μ M. The findings suggest that the AuNPs@NBSAC nanohybrid reveals promising applications and can be considered as potential electrode materials for development of electrochemical biosensors.
    Type of Medium: Online Resource
    ISSN: 0957-4484 , 1361-6528
    URL: Article
    DOI: 10.1088/1361-6528/abc388
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 1362365-5
    SSG: 11
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