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  • IOP Publishing  (25)
  • 1
    Online Resource
    Online Resource
    Study on the 400 mm 4 × 2 combined slab amplifier system
    IOP Publishing ; 2021
    In:  Laser Physics Letters Vol. 18, No. 8 ( 2021-08-01), p. 085002-
    Details
    In: Laser Physics Letters, IOP Publishing, Vol. 18, No. 8 ( 2021-08-01), p. 085002-
    Type of Medium: Online Resource
    ISSN: 1612-2011 , 1612-202X
    URL: Article
    DOI: 10.1088/1612-202X/ac0e3d
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2131546-2
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  • 2
    Online Resource
    Online Resource
    In-situ synthesis of Ni–Co–S nanoparticles embedded in novel carbon bowknots and flowers with pseudocapacitance-boosted lithium ion storage
    IOP Publishing ; 2019
    In:  Nanotechnology Vol. 30, No. 15 ( 2019-04-12), p. 155701-
    Details
    In: Nanotechnology, IOP Publishing, Vol. 30, No. 15 ( 2019-04-12), p. 155701-
    Type of Medium: Online Resource
    ISSN: 0957-4484 , 1361-6528
    URL: Article
    DOI: 10.1088/1361-6528/aafe42
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 1362365-5
    SSG: 11
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  • 3
    Online Resource
    Online Resource
    Simulation implementation of air pollution traceability algorithm based on unmanned aerial vehicle
    IOP Publishing ; 2021
    In:  IOP Conference Series: Earth and Environmental Science Vol. 675, No. 1 ( 2021-02-01), p. 012012-
    Details
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 675, No. 1 ( 2021-02-01), p. 012012-
    Abstract: Air pollution has serious harm to the ecological environment and human health. However, current ground monitoring methods and mobile robot traceability methods are difficult to accurately and quickly trace air pollution sources after pollution events. To solve this problem, this paper proposes an air pollution traceability algorithm based on unmanned aerial vehicle (UAV), which combines the mobile and flexible UAV with the hill climb traceability algorithm to realize the monitoring and tracking of air pollution source in a large area. Gaussian concentration field and turbulent concentration field are built by MATLAB, and the simulation experiment is carried out in these two concentration fields. Experimental results show that the algorithm can trace air pollution sources quickly and accurately.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    URL: Article
    DOI: 10.1088/1755-1315/675/1/012012
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2434538-6
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  • 4
    Online Resource
    Online Resource
    A dynamic failure mode and effect analysis (FMEA) method for CNC machine tool in service
    IOP Publishing ; 2023
    In:  Journal of Physics: Conference Series Vol. 2483, No. 1 ( 2023-05-01), p. 012047-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2483, No. 1 ( 2023-05-01), p. 012047-
    Abstract: To solve the problems such as uncertain evaluation information, high dependence on experts, and no consideration of the degradation of machine operating performance to failure risk in the practical application of FMEA in CNC machine tool operation and maintenance, a dynamic failure mode and effect analysis (FMEA) method for CNC machine tool in service is proposed, operation and maintenance data is introduced to the traditional failure risk analysis, which makes semantics criteria and data-driven method are systematically integrated, resulting in better performance of quantitative assessment and risk ranking of dynamic fault risk. Afterward, the fault classification and maintenance strategy of the CNC machine tool based on risk priority number (RPN) is proposed, which provides decision support for efficient operation and maintenance of the CNC machine tool. Finally, a machining center is taken as an example to verify the feasibility and effectiveness of the method.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/2483/1/012047
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2166409-2
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  • 5
    Online Resource
    Online Resource
    Electromagnetic modeling of 35kV distribution transformer lightning overvoltage and its prevention method
    IOP Publishing ; 2021
    In:  Journal of Physics: Conference Series Vol. 1980, No. 1 ( 2021-07-01), p. 012001-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1980, No. 1 ( 2021-07-01), p. 012001-
    Abstract: Distribution transformers are important power conversion equipment, whose safe and reliable operations affect the power supply quality of the distribution network. In order to analyze the lightning strike fault of distribution transformers, some more reasonable protection measures of transformers could be put forward. In this paper, a 35kV distribution transformer under the lightning strike is taken as the research object. Firstly, the lightning overvoltage model of the distribution transformer was established with the method of the double exponential model. Secondly, through the simulation of the distribution transformer, it was found that the electromagnetic transient distribution change dramatically, which will quickly cause the winding current flickering and form the winding overvoltage. Finally, through the voltage distribution law and the magnetic flux distortion of the transformer, it can be seen that the lightning overvoltage has a serious effect on the electromagnetic parameters of the transformer. The protection scheme is briefly analyzed, which has a guiding significance for the lightning protection design of distribution transformers.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1980/1/012001
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2166409-2
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  • 6
    Online Resource
    Online Resource
    NO x storage and reduction assisted by non-thermal plasma over Co/Pt/Ba/γ-Al 2 O 3 catalyst using CH 4 as reductant
    IOP Publishing ; 2021
    In:  Plasma Science and Technology Vol. 23, No. 2 ( 2021-02-01), p. 025506-
    Details
    In: Plasma Science and Technology, IOP Publishing, Vol. 23, No. 2 ( 2021-02-01), p. 025506-
    Abstract: NO x storage and reduction (NSR) technology has been regarded as one of the most promising strategies for the removal of nitric oxides (NO x ) from lean-burn engines, and the potential of the plasma catalysis method for NO x reduction has been confirmed in the past few decades. This work reports the NSR of nitric oxide (NO) by combining non-thermal plasma (NTP) and Co/Pt/Ba/ γ -Al 2 O 3 (Co/PBA) catalyst using methane as a reductant. The experimental results reveal that the NO x conversion of NSR assisted by NTP is notably enhanced compared to the catalytic efficiency obtained from NSR in the range of 150 °C–350 °C, and NO x conversion of the 8% Co/PBA catalyst reaches 96.8% at 350 °C. Oxygen (O 2 ) has a significant effect on the removal of NO x , and the NO x conversion increases firstly and then decreases when the O 2 concentration ranges from 2% to 10%. Water vapor reduces the NO x storage capacity of Co/PBA catalysts on account of the competition for adsorption sites on the surface of Co/PBA catalysts. There is a negative correlation between sulfur dioxide (SO 2 ) and NO x conversion in the NTP system, and the 8% Co/PBA catalyst exhibits higher NO x conversion compared to other catalysts, which shows that Co has a certain SO 2 resistance.
    Type of Medium: Online Resource
    ISSN: 1009-0630
    URL: Article
    DOI: 10.1088/2058-6272/abd620
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2240796-0
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  • 7
    Online Resource
    Online Resource
    Numerical Simulation Study on Failure of Graphite Heat Exchanger with Orifice Block
    IOP Publishing ; 2021
    In:  Journal of Physics: Conference Series Vol. 1802, No. 4 ( 2021-03-01), p. 042079-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1802, No. 4 ( 2021-03-01), p. 042079-
    Abstract: Phenolic impregnated graphite is a new kind of material with higher corrosion resistance and thermal conductivity. In the chemical industry, it is often used to make containers and pipes containing strong acid and alkali medium. It is the characteristic of phenolic resin impregnated graphite heat exchanger that the corrosion resistance and heat transfer efficiency of the heat exchanger are greatly improved. In this paper, a failure case of graphite heat exchanger in a chemical enterprise in Shanghai was analyzed by numerical simulation. According to the actual working conditions, the temperature field and flow field in the porous graphite heat exchanger were numerically simulated. The numerical simulation results of temperature field showed that the graphite block would be subject to thermal shock when the equipment was started and shut down, resulting in the increase of temperature difference of graphite block In addition, the pre tightening force of the flange of graphite heat exchanger was simulated by numerical simulation, and it was found that the position of stress concentration coincided with the crack position of actual failure, and the improvement suggestions were put forward for the structural design of graphite block.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1802/4/042079
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2166409-2
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  • 8
    Online Resource
    Online Resource
    Design and Implementation of Intelligent Security Robot Based on Lidar and Vision Fusion*
    IOP Publishing ; 2022
    In:  Journal of Physics: Conference Series Vol. 2216, No. 1 ( 2022-03-01), p. 012013-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2216, No. 1 ( 2022-03-01), p. 012013-
    Abstract: Nowadays, the mainstream security robot is expensive and the single 2D Lidar SLAM robot has large pose error and large matching calculation in navigation. To solve these problems, this paper designs an intelligent security robot based on the ROS system and STM32 microcontroller. Through the fusion of camera, IMU, lidar multi-sensor data, completing its own positioning, surrounding environment mapping and autonomous navigation functions; Binocular camera for face recognition, lock suspicious persons; Combined with temperature and humidity, smoke and other sensors for environmental monitoring, real-time alarm; Security personnel remote control, according to the data uploaded by the robot to complete the patrol. After a lot of experiments, the functions of the robot are better completed, which has a certain practical value.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/2216/1/012013
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2166409-2
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  • 9
    Online Resource
    Online Resource
    Study on performance change of phenolic resin impregnated graphite in acid environment
    IOP Publishing ; 2021
    In:  IOP Conference Series: Earth and Environmental Science Vol. 692, No. 3 ( 2021-03-01), p. 032077-
    Details
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 692, No. 3 ( 2021-03-01), p. 032077-
    Abstract: Phenolic impregnated graphite is a new kind of material with higher corrosion resistance and thermal conductivity. In the chemical industry, it is often used to make containers and pipes containing strong acid and alkali medium. In this paper, the working conditions of impregnated graphite materials in the actual production were simulated in the laboratory, and the. mechanical properties and material characterization of impregnated graphite after soaking in sulfuric acid at different temperatures were compared. The results show that the tensile strength of phenolic resin impregnated graphite decreases with the increase of immersion temperature under the action of acid medium and temperature; the results of thermogravimetric analysis show that the inner phenolic resin expands and extrudes graphite particles to produce internal stress, and the graphite particles will fall off partially, but the chemical structure of phenolic resin does not change.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    URL: Article
    DOI: 10.1088/1755-1315/692/3/032077
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2434538-6
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  • 10
    Online Resource
    Online Resource
    An iterative image-based inter-frame motion compensation method for dynamic brain PET imaging
    IOP Publishing ; 2022
    In:  Physics in Medicine & Biology Vol. 67, No. 3 ( 2022-02-07), p. 035012-
    Details
    In: Physics in Medicine & Biology, IOP Publishing, Vol. 67, No. 3 ( 2022-02-07), p. 035012-
    Abstract: As a non-invasive imaging tool, positron emission tomography (PET) plays an important role in brain science and disease research. Dynamic acquisition is one way of brain PET imaging. Its wide application in clinical research has often been hindered by practical challenges, such as patient involuntary movement, which could degrade both image quality and the accuracy of the quantification. This is even more obvious in scans of patients with neurodegeneration or mental disorders. Conventional motion compensation methods were either based on images or raw measured data, were shown to be able to reduce the effect of motion on the image quality. As for a dynamic PET scan, motion compensation can be challenging as tracer kinetics and relatively high noise can be present in dynamic frames. In this work, we propose an image-based inter-frame motion compensation approach specifically designed for dynamic brain PET imaging. Our method has an iterative implementation that only requires reconstructed images, based on which the inter-frame subject movement can be estimated and compensated. The method utilized tracer-specific kinetic modelling and can deal with simple and complex movement patterns. The synthesized phantom study showed that the proposed method can compensate for the simulated motion in scans with 18 F-FDG, 18 F-Fallypride and 18 F-AV45. Fifteen dynamic 18 F-FDG patient scans with motion artifacts were also processed. The quality of the recovered image was superior to the one of the non-corrected images and the corrected images with other image-based methods. The proposed method enables retrospective image quality control for dynamic brain PET imaging, hence facilitating the applications of dynamic PET in clinics and research.
    Type of Medium: Online Resource
    ISSN: 0031-9155 , 1361-6560
    URL: Article
    DOI: 10.1088/1361-6560/ac4a8f
    RVK:
    WA 15000
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1473501-5
    SSG: 12
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