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    Wyświetlanie 1-4 z 4
    Tytuł:
    Ozone detection based on an nitrogen oxide photoacoustic spectroscopy system and chemical reaction
    Autorzy:
    Jin, Huawei
    Ji, Haitao
    Wang, Haowei
    Li, Shuo
    Powiązania:
    https://bibliotekanauki.pl/articles/28407430.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    photoacoustic spectroscopy
    nitric oxide
    ozone
    differential detection
    spektroskopia fotoakustyczna
    tlenek azotu
    ozon
    dedekcja różnicowa
    Opis:
    Ozone is known as a “god-given purifying agent”, and its quantitative detection is of great significance. A low-cost photoacoustic spectroscopy (PAS) which is based on absorption at the low-power blue diode emitting at 403.65 nm has been used for nitrogen oxide (NO2) concentration measurements. According to the formula of nitric oxide (NO) reaction and ozone (O3) production of NO2and the differential detection method, a dual-channel PAS system for O3 detection is reported. The consistency of NO2detection with the dual-channel photoacoustic spectroscopy system is good by contrast. The coefficient of determination R2 can still reach 0.846. An intercomparison between the system and a cavity ring-down system (CRDS) was shown to verify the accuracy. The results showed a linear correction factor (R2) of 0.943 in a slope of 0.862±0.002, with an offset of (0.773±0.128) ppb. In addition, the measurement of 3using the dual-channel cavity photoacoustic spectroscopy technique was deployed. These observations indicate that 3concentrations can be effectively observed with the dual-channel PAS instrument.
    Źródło:
    Environment Protection Engineering; 2023, 49, 4; 73--87
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time requirements in closed and open batch distillation arrangements for separation of a binary mixture
    Autorzy:
    Zhao, Shuo
    Bai, Peng
    Guo, Xianghai
    Tang, Ke
    Li, Guangzhong
    Powiązania:
    https://bibliotekanauki.pl/articles/778400.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    time requirements
    closed operation
    multivessel column
    binary mixture
    Opis:
    Batch time requirements are provided for the separation of binary zeotropic mixtures in two different multivessel columns (with and without vapor bypass), a non-cyclic two-vessel column and a regular batch column based on dynamic simulations. The first three columns are operated as closed (total reflux) systems and the regular batch column is operated as an open (partial reflux) system. We analyze the effects of feed composition, relative volatility and product specification on the time requirements. The multivessel arrangements perform better than the regular batch column, which requires from 4.00 to 34.67% more time to complete a given separation. The elimination of the vapor bypass in the multivessel column is impractical though it has a positive effect on the batch time requirements. Thus, the multivessel column, with the vapor stream bypassing the intermediate vessel, is proposed as the best candidate for a binary zeotropic mixture with low concentration of light component, low relative volatility and high product purity demand. Furthermore, an experimental multivessel column with vapor bypass is built and the corresponding experiments verify the simulations.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 4; 66-74
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on driving behavior decision making system of autonomous driving vehicle based on benefit evaluation model
    Autorzy:
    Wang, Pengwei
    Gao, Song
    Li, Liang
    Cheng, Shuo
    Zhao, Hailan
    Powiązania:
    https://bibliotekanauki.pl/articles/223910.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    autonomous driving vehicle
    decision making model
    finite state machine
    lane change decision
    Opis:
    Autonomous driving vehicle could increase driving efficiency, reduce traffic congestion and improve driving safety, it is considered as the solution of current traffic problems. Decision making systems for autonomous driving vehicles have significant effects on driving performance. The performance of decision making system is affected by its framework and decision making model. In real traffic scenarios, the driving condition of autonomous driving vehicle faced is random and time-varying, the performance of current decision making system is unable to meet the full scene autonomous driving requirements. For autonomous driving vehicle, the division between different driving behaviors needs clear boundary conditions. Typically, in lane change scenario, multiple reasonable driving behavior choices cause conflict of driving state. The fundamental cause of conflict lies in overlapping boundary conditions. To design a decision making system for autonomous driving vehicles, firstly, based on the decomposition of human driver operation process, five basic driving behavior modes are constructed, a driving behavior decision making framework for autonomous driving vehicle based on finite state machine is proposed. Then, to achieve lane change decision making for autonomous driving vehicle, lane change behavior characteristics of human driver lane change maneuver are analyzed and extracted. Based on the analysis, multiple attributes such as driving efficiency and safety are considered, all attributes benefits are quantified and the driving behavior benefit evaluation model is established. By evaluating the benefits of all alternative driving behaviors, the optimal driving behavior for current driving scenario is output. Finally, to verify the performances of the proposed decision making model, a series of real vehicle tests are implemented in different scenarios, the real time performance, effectiveness, and feasibility performance of the proposed method is accessed. The results show that the proposed driving behavior decision making model has good feasibility, real-time performance and multi-choice filtering performance in dynamic traffic scenarios.
    Źródło:
    Archives of Transport; 2020, 53, 1; 21-36
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of progressive collapse of a super-long span latticed steel arch structure
    Autorzy:
    Guo, Shuangchao
    Xu, Delin
    Shang, Kaiguang
    Yang, Shuo
    Wang, Di
    Li, Gen
    Zheng, Bing
    Jiao, Yong
    Powiązania:
    https://bibliotekanauki.pl/articles/2200875.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    progressive collapse
    steel arch truss structure
    compression instability
    Opis:
    The progressive collapse of a space grid structure which has a large number of members and a large span is the focus of current research. Before the progressive collapse of the structure, there is a problem of instability of the members. In this paper, dynamic nonlinear analysis of a super-long span latticed steel arch structure is carried out to study its progressive collapse process using a Kinematic Hardening Plasticity constitutive model compiled by Vumat material subprogram in Abaqus, which takes into account instability of the members. Differences in the dynamic response process of the structure at the collapse moment and the failure sequence of the members using the member stability model and the material failure constitutive model are compared. Compared with the material failure constitutive model, when the member stability constitutive model is used, the proportion of compressive buckling members in the structural failure is higher, and the bearing capacity of the structure is lower when the initial failure occurs. The structure suffers from localized member compressive failure rather than material yielding, which leads to the progressive collapse of the structure.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2023, 61, 1; 103--117
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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