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    Wyświetlanie 1-11 z 11
    Tytuł:
    Influence of hydrated Ca2+ and Mg2+ complexes on the sulfidization of smithsonite : density functional based tight binding (DFTB+) study
    Autorzy:
    Wu, Zhiqiang
    Tang, Xiaoqin
    Chen, Jianhua
    Chen, Ye
    Powiązania:
    https://bibliotekanauki.pl/articles/2175440.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    smithsonite
    sulfidization
    DFTB+ hydrated
    adsorption
    Opis:
    Ca2+ and Mg2+ are the most dominating unavoidable ions in the smithsonite flotation. In this paper, the effect of Ca2+ (Mg2+) on the surface of smithsonite sulfidization in a system where water molecules are present was investigated using density functional based tight binding (DFTB+) simulations for the first time. The results indicated that the adsorption of hydrated Ca2+ complexes is stronger than that of hydrated Mg2+ complexes on the hydrated smithsonite (101) surface. In addition, at low concentrations of sodium sulfide, there is no adsorption of HS- on the surface pre-adsorbed with hydrated Ca2+ complexes, but only on the surface pre-adsorbed with hydrated Mg2+ complexes. At high concentrations of Na2S, S2- weakens the adsorption of hydrated Ca2+ complexes due to competitive adsorption, but the presence of S2- could desorb hydrated Mg2+ complexes from the surface. The results compared the differences in effects of Ca2+ and Mg2+ on smithsonite sulfidization, which could provide an atomic scale basis for researching the surface sulfidization of oxide minerals.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 156040
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the risk classification of cruise ship fires based on an attention-BP neural network
    Autorzy:
    Xiong, Zhenghua
    Xiang, Bo
    Chen, Ye
    Chen, Bin
    Powiązania:
    https://bibliotekanauki.pl/articles/32912853.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    cruise fire
    simulation modeling
    ensemble learning
    BP neural network
    Opis:
    Due to the relatively closed environment, complex internal structure, and difficult evacuation of personnel, it is more difficult to prevent ship fires than land fires. In this paper, taking the large cruise ship as the research object, the physical model of a cruise cabin fire is established through PyroSim software, and the safety indexes such as smoke temperature, CO concentration, and visibility are numerically simulated. An Attention-BP neural network model is designed for realizing the intelligent identification of a cabin fire and dividing the risk level, which integrates the diagnosis results of multiple neural network models through the self-Attention mechanism and adaptively distributes the weight of each BP neural network model. The proposed model can provide decision-making reference for subsequent fire-fighting measures and personnel evacuation. Experimental results show that the proposed Attention-BP neural network model can effectively realize the early warning of the fire risk level. Compared with other machine learning algorithms, it has the highest stability and accuracy and reduces the uncertainty of early cabin fire warning.
    Źródło:
    Polish Maritime Research; 2022, 3; 61-68
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Experiments of A New Internal Cone Type Traveling Wave Ultrasonic Motor
    Autorzy:
    Chen, Ye
    Yang, Junlin
    Li, Liang
    Xiao, Shihao
    Powiązania:
    https://bibliotekanauki.pl/articles/31339802.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    ultrasonic motors
    traveling wave
    internal cone type
    bending vibration
    Opis:
    In order to simplify the motor structure, to reduce the difficulty of rotor pre-pressure application and to obtain better output performance, a new internal cone type rotating traveling wave ultrasonic motor is proposed. The parametric model of the internal cone type ultrasonic motor was established by the ANSYS finite element software. The ultrasonic motor consists of an internal cone type vibrator and a tapered rotor. The dynamic analysis of the motor vibrator is carried out, and two in-plane third-order bending modes with the same frequency and orthogonality are selected as the working modes. The other advantages of this motor are that pre-pressure can be imposed by the weight of the rotor. The prototype was trial-manufactured and experimentally tested for its vibration characteristics and output performance. When the excitation frequency is 22260.0 Hz, the pre-pressure is 0.1 N and the peak-to-peak excitation voltage is 300 V, the maximum output torque of the prototype is 1.06 N · mm, and the maximum no-load speed can reach 441.2 rpm. The optimal pre-pressure force under different loads is studied, and the influence of the pre-pressure force on the mechanical properties of the ultrasonic motor is analyzed. It is instructive in the practical application of this ultrasonic motor.
    Źródło:
    Archives of Acoustics; 2023, 48, 3; 373-380
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An approach to suppress high-frequency resonance using model predictive and selective harmonic elimination combined strategy
    Autorzy:
    Chen, Sitong
    Chen, Xiaoqiang
    Wang, Ying
    Xiong, Ye
    Powiązania:
    https://bibliotekanauki.pl/articles/1841300.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CRH5 EMUs and traction power supply coupled system
    high-frequency oscillation
    high speed railway
    model predictive control (MPC)
    selective harmonic elimination pulse-width modulation (SHEPWM)
    CRH5 EMU i system sprzężony z zasilaniem trakcyjnym
    oscylacja wysokiej częstotliwości
    kolej dużych prędkości
    kontrola predykcyjna modelu (MPC)
    selektywna eliminacja harmoniczna modulacja szerokości impulsu (SHEPWM)
    Opis:
    High-frequency resonance is a prominent phenomenon which affects the normal operation of the high-speed railway in China. Aiming at this problem, the resonance mechanism is analyzed first. Then, model predictive control and selective harmonic elimination pulse-width modulation (MPC-SHEPWM) combined control strategy is proposed, where the harmonics which cause the resonance can be eliminated at the harmonic source. Besides, the MPC is combined to make the current track the reference in transients. The proposed control has the ability to suppress the resonance while has a faster dynamic performance comparing with SHEPWM. Finally, the proposed MPC-SHEPWM is tested in a simulation model of CRH5 (Chinese Railway High-speed), EMUs (electric multiple units) and a traction power supply coupled system, which shows that the proposed MPC-SHEPWM approach can achieve the resonance suppression and shows a better dynamic performance.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 2; 415-430
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Analysis of Ultrasonic Composite Transducer with a Quarter-wave Taper Transition Horn
    Autorzy:
    Chen, Tao
    Li, Hongbo
    Wang, Qihan
    Ye, Junpeng
    Powiązania:
    https://bibliotekanauki.pl/articles/1953535.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    equivalent circuit
    composite transducer
    quarter-wave
    prestressed bolt
    finite element analysis
    Opis:
    Based on the electromechanical equivalent circuit theory, equations related to the resonance frequency and the magnifying coefficient of a quarter-wave vibrator and a quarter-wave taper transition horn were deduced, respectively. A series of 3D models of ultrasonic composite transducers with various conical section length was also established. To reveal the influences of the conical section length and the prestressed bolt on the dynamic characteristics (resonance frequency, amplitude, displacement node, and the maximum equivalent stress) of the models and the design accuracy, finite element (FE) analyses were carried out. The results show that the addition of prestressed bolt increases the resonance frequency and causes the displacement node on the center axis to move towards the small cylindrical section. As the conical section length rises, the increment of resonance frequency reduces and tends to a stable value of 360 Hz while the displacement of the node on the center axis becomes lager and gradually approaches 1.5 mm. Furthermore, the amplitude of the output terminal is stable at 16.18 µm under 220 V peak-topeak (77.8 VRMS) sinusoidal potential excitation. After that, a prototype was fabricated and validated experiments were conducted. The experimental results are consistent with that of theory and simulations. It provides theoretical basis for the design and optimization of small-size, large-amplitude, and high-power composite transducers.
    Źródło:
    Archives of Acoustics; 2020, 45, 4; 687-697
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of Electrospun Composite PEG/PVP Phase-Change Nanofibers and their Application in Cigarette Cooling Filters
    Autorzy:
    Chen, Chen
    Li, Liqun
    Qiao, Yuemei
    Guo, Chunsheng
    Ye, Yajun
    Du, He
    Powiązania:
    https://bibliotekanauki.pl/articles/24200970.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    electrospun nanofiber
    phase-change material
    cigarette cooling filter
    PEG
    polyethylene glycol
    PVP
    polyvinylpyrrolidone
    PCM
    Opis:
    Composite phase-change nanofibers were prepared by electrospinning with polyethylene glycol (PEG) as the phase-change material (PCM) and polyvinylpyrrolidone (PVP) as the carrier matrix. The high PEG content endowed the nanofibers with an excellent cooling effect and significantly reduced the smoke temperature. For PEG70/PVP nanofibers, the smoke temperature can be decreased 45℃ at the 8th puff, and be kept below 45℃. The cooling test proved that the electrospun PEG/PVP phase-change nanofibers exhibited a desirable cooling performance, improving the comfort of cigarette products. And the composite PEG/PVP phase-change nanofibers present great potential as the cooling cigarette filter material for HnB tobacco application.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2023, 31, 3; 9-13
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical and experimental verification of impact response of laminated aluminum composite structure
    Autorzy:
    Wang, Jifeng
    Morris, Tyler P.
    Bihamta, Reza
    Pan, Ye-Chen
    Powiązania:
    https://bibliotekanauki.pl/articles/140133.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laminated aluminum structure
    axial drop
    buckling
    three-point bending
    flexural response
    delamination
    Opis:
    Laminated Aluminum Composite Structure (LACS) has shown great potential for replacing traditional bulk aluminum parts, due to its ability to maintain low manufacturing costs and create complex geometries. In this study, a LACS, that consists of 20 aluminum layers joined by a structural tape adhesive, was fabricated and tested to understand its impact performance. Three impact tests were conducted: axial drop, normal and transverse three-point bending drop tests. Numerical simulations were performed to predict the peak loads and failure modes during impacts. Material models with failure properties were used to simulate the cohesive failure, interfacial failure, and aluminum fracture. Various failure modes were observed experimentally (large plastic deformation, axial buckling, local wrinkling, aluminum fracture and delamination) and captured by simulations. Cross-section size of the axial drop model was varied to understand the LACS buckling direction and force response. For threepoint bending drop simulations, the mechanism causing the maximum plastic strain at various locations in the aluminum and adhesive layers was discussed. This study presents an insight to understand the axial and flexural responses under dynamic loading, and the failure modes in LACS. The developed simulation methodology can be used to predict the performance of LACS with more complex geometries.
    Źródło:
    Archive of Mechanical Engineering; 2020, LXVII, 2; 127-147
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Forecasting short-term electric load using extreme learning machine with improved tree seed algorithm based on Lévy flight
    Autorzy:
    Chen, Xuan
    Przystupa, Krzysztof
    Ye, Zhiwei
    Chen, Feng
    Wang, Chunzhi
    Liu, Jinhang
    Gao, Rong
    Wei, Ming
    Kochan, Orest
    Powiązania:
    https://bibliotekanauki.pl/articles/2087016.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    short-term electric load forecast
    extreme learning machine
    Lévy flight
    tree-seed algorithm
    Kernel principal component analysis
    Opis:
    In recent years, forecasting has received increasing attention since it provides an important basis for the effective operation of power systems. In this paper, a hybrid method, composed of kernel principal component analysis (KPCA), tree seed algorithm based on Lévy flight (LTSA) and extreme learning machine (ELM), is proposed for short-term load forecasting. Specifically, the randomly generated weights and biases of ELM have a significant impact on the stability of prediction results. Therefore, in order to solve this problem, LTSA is utilized to obtain the optimal parameters before the prediction process is executed by ELM, which is called LTSA-ELM. Meanwhile, the input data is extracted by KPCA considering the sparseness of the electric load data and used as the input of LTSA-ELM model. The proposed method is tested on the data from European network on intelligent technologies (EUNITE) and experimental results demonstrate the superiority of the proposed approaches compared to the other methods involved in the paper.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 2; 153--162
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular cloning, expression and characterization of Bmserpin-2 gene from Bombyx mori
    Autorzy:
    Pan, Ye
    Xia, Hengchuan
    Lü, Peng
    Chen, KePing
    Yao, Qin
    Chen, Huiqin
    Gao, Lu
    He, Yuanqing
    Wang, Lin
    Powiązania:
    https://bibliotekanauki.pl/articles/1040486.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    serpin-2
    Bombyx mori
    bioinformatics
    subcellular location
    qPCR
    Opis:
    Serpins are a broadly distributed family of protease inhibitors. In this study, the gene encoding Bombyx mori serpin-2 (Bmserpin-2) was cloned and expressed in E. coli. The Bmserpin-2 cDNA contains a 1125 bp open reading frame (ORF). The deduced protein has 374 amino-acid residues, contains a conserved SERPIN domain and shares extensive homology with other invertebrate serpins. RT-PCR analysis showed that Bmserpin-2 was expressed in all developmental stages of B. mori larvae and various larval tissues. Subcellular localization analysis indicated that Bmserpin-2 protein was located in the cytoplasm. Interestingly, real-time quantitative PCR revealed that the expression of Bmserpin-2 in the midgut of susceptible B. mori strain 306 significantly increased at 72 hours post inoculation (hpi) when infected with BmNPV. However, there was no significant increase of the Bmserpin-2 expression in resistant strain NB infected with BmNPV. Thus, our data indicates that Bmserpin-2 may be involved in B. mori antiviral response.
    Źródło:
    Acta Biochimica Polonica; 2009, 56, 4; 671-677
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ChatGPT: Cross cultural tourism research imperative
    Autorzy:
    Chen, Sirong
    Zhang, Ke
    Li, Xiaonan
    Ye, Huiyue
    Lin, Katsy Jiaxin
    Law, Rob
    Powiązania:
    https://bibliotekanauki.pl/articles/2199826.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Ekonomiczny w Katowicach
    Tematy:
    ChatGPT
    large language models
    tourism
    cross-cultural analysis
    Opis:
    Aim/purpose – Cultural differences play an influential role in driving tourism development and varying outcomes of technology acceptance. The impact of ChatGPT on tourism is yet to be explored. Therefore, this study discussed how ChatGPT may influence tourism development and management in different cultural contexts. Design/methodology/approach – Drawing specifically on individualism and collectivism from Hofstede’s cultural dimensions theory, this study compared the differences in the perception of ChatGPT between Oriental and Western cultures. Findings – Individualism and collectivism explain the diversity of perception on ChatGPT between Oriental and Western cultures. Research implications/limitations – Implications and suggestions are provided to academia and industry accordingly. Particularly, the difference between technological concepts and tools is highlighted to avoid having excessive expectations toward tools. Originality/value/contribution – This study extends the research on tourism and Artificial Intelligence and advocates additional attention to the imperative of cross-cultural differences regarding ChatGPT and tourism.
    Źródło:
    Journal of Economics and Management; 2023, 45; 137-146
    1732-1948
    Pojawia się w:
    Journal of Economics and Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of chromium and strontium from aqueous solutions by adsorption on laterite
    Autorzy:
    He, Yong
    Chen, Yong-Gui
    Zhang, Ke-Neng
    Ye, Wei-Min
    Wu, Dong-Yu
    Powiązania:
    https://bibliotekanauki.pl/articles/204768.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    adsorption
    isotherms
    chromium
    strontium
    laterite
    Opis:
    To investigate the adsorptive properties of a local laterite deposited in Chenzhou, Hunan province, China, the adsorptive properties of the natural laterite were investigated by batch technique in this study. The effects of contact time, pH, ionic strength, temperature, and the concentration on adsorption properties were also analyzed. The obtained experimental results show that the main mineral composition of laterite is kaolinite and montmorillonite. The adsorption process achieved equilibrium within 60 minutes and 90 minutes for Sr(II) and Cr(VI), respectively. The adsorption capacities for Cr(VI) and Sr(II) by the laterite were about 7.25 mg·g-1 and 8.35 mg·g-1 under the given experimental conditions, respectively. The equilibrium adsorption data were fitted to the second-order kinetic equation. The adsorption capacity for Sr(II) onto the laterite increased with increasing pH from 3–11 but decreased with increasing ionic strength from 0.001 to 1.0 M NaCl. The Sr(II) adsorption reaction on laterite was endothermic and the process of adsorption was favored at high temperature. Similarly, the adsorption capacity for Cr(VI) onto the laterite increased with increasing pH from 3–11, however, the ionic strength and temperature had an insignificant effect on Cr(VI) adsorption. The adsorption of Cr(VI) and Sr(II) was dominated by ion exchange and surface complexation in this work. Furthermore, the Langmuir and Freundlich adsorption isotherm model was used for the description of the adsorption process. The results suggest that the studied laterite samples can be effectively used for the treatment of contaminated wastewaters.
    Źródło:
    Archives of Environmental Protection; 2019, 45, 3; 11-20
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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