Electron emission plays a dominant role in plasma-cathode interactions and is a key factor in many plasma phenomena and industrial *** is necessary to illustrate the various electron emission mechanisms and the corres...
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Electron emission plays a dominant role in plasma-cathode interactions and is a key factor in many plasma phenomena and industrial *** is necessary to illustrate the various electron emission mechanisms and the corresponding applicable description models to evaluate their impacts on discharge *** this study,detailed expressions of the simplified formulas valid for field emission to thermo-field emission to thermionic emission typically used in the numerical simulation are proposed,and the corresponding application ranges are determined in the framework of the Murphy-Good theory,which is commonly regarded as the general model and to be accurate in the full range of conditions of the validity of the *** parameterization was used to evaluate the emission current density of the Murphy-Good formula,and a deviation factor was defined to obtain the application ranges for different work functions(2.5‒5 eV),cathode temperatures(300‒6000 K),and emitted electric fields(10^(5) to 10^(10) V·m^(-1)).The deviation factor was shown to be a nonmonotonic function of the three parameters.A comparative study of particle number densities in atmospheric gas discharge with a tungsten cathode was performed based on the one-dimensional implicit particle-in-cell(PIC)with the Monte Carlo collision(MCC)method according to the aforementioned application *** was found that small differences in emission current density can lead to variations in the distributions of particle number density due to changes in the collisional *** study provides a theoretical basis for selecting emission models for subsequent numerical simulations.
Inspired by basic circuit connection methods,memristors can also be utilized in the construction of complex discrete chaotic *** investigate the dynamical effects of hybrid memristors,we propose two hybrid tri-memrist...
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Inspired by basic circuit connection methods,memristors can also be utilized in the construction of complex discrete chaotic *** investigate the dynamical effects of hybrid memristors,we propose two hybrid tri-memristor hyperchaotic(HTMH)mapping structures based on the hybrid parallel/cascade and cascade/parallel operations,*** the HTMH mapping structure with hybrid parallel/cascade operation as an example,this map possesses a spatial invariant set whose stability is closely related to the initial states of the *** distributions and bifurcation behaviours dependent on the control parameters are explored with numerical ***,the memristor initial offset-boosting mechanism is theoretically demonstrated,and memristor initial offset-boosting behaviours are numerically *** results clarify that the HTMH map can exhibit hyperchaotic behaviours and extreme multistability with homogeneous coexisting infinite *** addition,an FPGA hardware platform is fabricated to implement the HTMH map and generate pseudorandom numbers(PRNs)with high ***,the generated PRNs can be applied in Wasserstein generative adversarial nets(WGANs)to enhance training stability and generation capability.
With the popularization of smartphones with GPS, user information attached to the locations is facing the risk of leakage. In the real world, even if the locations of a user are well protected, attackers can also mine...
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Respiratory protection is critical to minimize airborne infection risk for healthcare *** main factor affecting infection risk in the medical scenario is leakage between the respirator and the healthcare workers’***,...
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Respiratory protection is critical to minimize airborne infection risk for healthcare *** main factor affecting infection risk in the medical scenario is leakage between the respirator and the healthcare workers’***,it is difficult to quantify the effectiveness of respirators due to the numerous influencing *** medical activities were simulated by the fitting test,and the inverse of the results were used to get the total inward leakage of respirators.114 subjects were divided according to gender,profession,age,risk area,and BMIs,participated in fitting test of four N95 *** result showed that the value range of total inward leakage for tested N95 respirators was between 0.50%and 2.39%.Flat-folded respirators were more prone to leakage than cup-shaped ones,so it was essential to account for the impact of respirator ***,this study found that gender and profession had no significant correlation with total inward *** medical procedures include bending,and turning head from side to side,or up and down,which had a significant influence on the protective efficacy of the N95 *** dimensions and BMI exerted a more pronounced influence on the protective efficacy of the N95 respirator,and they were in the *** personnels wore a well-fitting N95 respirator properly for excellent protection,reducing occurrence of nosocomial infections and occupational exposures,and optimizing respiratory protection strategies.
Qinqiang Opera is a treasure of Chinese intangible cultural inheritance. To inject new vitality into the creation and development of Qinqiang opera, this paper proposes an automatic Qinqiang opera generation method ba...
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Two dimensional(2D)materials are promising gas sensing materials,but the most of them need to be heated to show promising sensing *** structures with high sensing performance at room-temperature are ***,another 2D mat...
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Two dimensional(2D)materials are promising gas sensing materials,but the most of them need to be heated to show promising sensing *** structures with high sensing performance at room-temperature are ***,another 2D material,violet phosphorus(VP)nanoflake is investigated as gas sensing *** VP nanoflakes have been effectively ablated to have layers of 1–5 layers by laser ablation in *** VP nanoflakes are combined with graphene to form VP/G heterostructuresbased NO *** ultra-high gauge factor of 3×10^(7)for ppb-level sensing and high resistance response of 59.21%with ultra-short recovery time of 6s for ppm-level sensing have been *** sensing mechanism is also analysed by density functional theory(DFT)*** adsorption energy of VP/G is calculated to be-0.788 e V,resulting in electrons migration from P to N to form a P-N bond in the gap between VP and graphene *** work provides a facile approach to ablate VP for mass *** as-produced structures have also provided potential gas sensors with ultrasensitive performance as ppb-level room-temperature sensors.
Point clouds registration is a key step in three-dimension data processing and the Iterative Closest Point algorithm has been widely for this task. An improved semi-dense Iterative Closest Point registration algorithm...
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The diffusion of toxic gas caused by the leakage of stored high-pressure chemical gases will cause significant harm to the environment and residents. Therefore, it is crucial to trace the source of leakage and predict...
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0 INTRODUCTION The Qinling Mountains(QM),located at the geographical center of China,serve as a crucial dividing line between the northern and southern and play a vital role as an ecological security barrier,significa...
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0 INTRODUCTION The Qinling Mountains(QM),located at the geographical center of China,serve as a crucial dividing line between the northern and southern and play a vital role as an ecological security barrier,significantly influencing the country's geological,geographical,and ecological landscape(Jia et al.,2023;Peng et al.,2023).The QM stretch from the White Stone Mountain in the northern part of Lintan County,Gansu Province,to the Funiu Mountains in Henan Province in the east.
Analyzing relationships among pathological images under varying conditions during colposcopy is crucial for diagnosing cervical dysplasia. However, images from different conditions present challenges in accurate align...
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