The vortex electromagnetic (EM) wave radar has the potential to obtain more accurate micro‐motion parameters for target recognition. However, with the existing algorithms of micro‐motion parameter ...extraction it is difficult to obtain the real rotation radius and tilt angle of a rotational target in the presence of multiple scattering points in the radar beam. A micro‐motion parameter extraction algorithm for rotating targets based on the vortex EM wave radar is proposed in this article. The angular Doppler is obtained from the dual‐mode vortex EM echoes. The time interval between the maximum and minimum angular Doppler frequency is derived. The relationship between the time interval and micro‐motion parameters is shown. By combining the linear Doppler and the angular Doppler, the micro‐motion parameters are roughly estimated. Then, fine micro‐motion parameters are obtained by using an iterative soft threshold algorithm. The proposed algorithm can extract the real rotation radius and tilt angle in the case of multiple scattering points. The performance and robustness of the algorithm are proved by simulations.
Due to increasingly intense competition among companies, employees' innovative behavior has not only become a crucial factor for company development but also a topic of broad and current interest ...among companies and researchers. It is a requisite for companies to identify the antecedents of employees' innovative behavior. The main objective of this study was to investigate the effect of psychological capital (PsyCap) on employees' innovative behavior through its relationship with job satisfaction and organizational commitment. The partial least squares method was adopted in this study to analyze 266 employees from China. The results showed that PsyCap had positive effects on job satisfaction and organizational commitment, and verified the relationship between employees' innovative behavior and their job satisfaction and organizational commitment. Moreover, the mediating effect of PsyCap in terms of job satisfaction and organizational commitment on employees' innovative behavior was verified by a mediation analysis. Employees' innovative behavior is not only essential for the research and development department; rather, it is also important for other departments. The empirical results of this study show that companies should consider taking measures to increase employees' PsyCap, so as to enhance their innovative behavior. Lastly, the study also provided the managerial implications of its findings and recommendations for future research.
•Inhibition of bacterial growth by EGCG is not attributed to its H2O2 production.•EGCG increase intracellular ROS and induce adaptive oxidative stress response.•Inhibition of bacterial growth by EGCG ...was blunted by NAC.•EGCG increased bacterial lethality of paraquat with synergistic effect.
The antibacterial effects of tea polyphenol epigallocatechin gallate (EGCG), a common phytochemical with a number of potential health benefits, are well known. However, the mechanism of its bactericidal action remains unclear. Using E. coli as a model organism, it is argued here that H2O2 synthesis by EGCG is not attributed to its inhibitory effects. In contrast, the bactericidal action of EGCG was a result of increased intracellular reactive oxygen species and blunted adaptive oxidative stress response in E. coli due to the co-administration of antioxidant N-acetylcysteine, and not on account of exogenous catalase. Furthermore, we noted a synergistic bactericidal effect for EGCG when combined with paraquat. However, under anaerobic conditions, the inhibitory effect of EGCG was prevented. In conclusion, EGCG caused an increase in endogenous oxidative stress in E. coli, thereby inhibiting its growth, and hence the use of EGCG as a prooxidant is supported by this study.
In this article, we present the analysis, design, and implementation of a wideband 10-W monolithic microwave integrated circuit power amplifier (PA), fabricated in a low-cost 0.1-<inline-formula> ...<tex-math notation="LaTeX">\mu \text{m} </tex-math></inline-formula> gallium nitride (GaN) on Si technology. The design is focused on the realization of a low-loss and wideband impedance transformation networks across 2-20 GHz using a reactive matching (RM) technique. The two-stage GaN PA achieves an average output power of 40.1 dBm and a peak output power of 41.6 dBm at 13 GHz, in the CW-mode operation, with a small-signal gain of <inline-formula> <tex-math notation="LaTeX">S_{21} > 25.5 </tex-math></inline-formula> dB over the entire bandwidth. The average power-added efficiency (PAE) is 21%, with a peak PAE of 29% at 6 GHz. The PA chip occupies an area of <inline-formula> <tex-math notation="LaTeX">2.9\times 2.6 </tex-math></inline-formula> mm 2 . To the best of our knowledge, the PA presented in this work demonstrates the highest broadband gain among the reported GaN-based RMPAs with a corresponding output power of about 10 W.
The micro-Doppler (m-D) effect of radar targets reflects the target motion attribute, which can provide important information for target recognition. Based on the m-D effect, the estimation of ...micromotion parameters of the cone is of great significance in the field of antimissile. However, the existing methods based on monostatic radar can only extract some micromotion parameters, and the research on m-D properties is not in-depth enough. In this article, the m-D properties of the precession cone with fins are studied. First, the motion model of the precession cone with fins is given. Subsequently, the frequency shift equation of the fin is studied, and a set of equations containing the relationship between the micromotion parameters is constructed. The micromotion parameters (precession angle, bottom radius, angle between the coning vector and the radar line of sight, etc.) are estimated by solving the set of equations. The effectiveness of the algorithm is verified by simulated data and measured data.
ABSTRACTEnterprise Instant Messaging (EIM) has become an increasingly important tool for enterprises to operate efficiently and for the employees to communicate smoothly, especially with the recent ...outbreak of the pandemic. This means that employers and employees are having to adapt to new ways of working, e.g. teleworking or home-based working, and they could experience emotional stress, irritability and anxiety. However, few studies have used sentiment analysis to help employees manage their emotions and past studies mostly applied retrospective sentiment analysis on user-generated content as such as Twitter or the internal enterprise data. In this study we present an Employee Sentiment Analysis and Management System (ESAMS) that continuously monitors the emotions of the employees in real time by analyzing the conversations so the managerial members and the team members can actively manage their emotions or adjust their actions on the spot. As a proof-of-concept, we use Naïve Bayes as our sentiment classifier and achieve an average classification accuracy of 74%. The ESAMS was pilot-tested for one month by 10 participants, who were later interviewed as part of the evaluation. The results show that the ESAMS was helpful in improving team performance and team management.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
The vortex electromagnetic (EM) wave carrying orbital angular momentum (OAM) has attracted much attention in radar applications. Aimed at the moving target detection application of vortex EM waves, ...the Doppler effect and the micro-Doppler (m-D) effect, both including the linear Doppler shift and the angular Doppler shift, are investigated. The theoretical analyses demonstrate that the Doppler effect and the m-D effect in vortex-EM-wave-based radar are significantly more complicated than those in traditional non-vortex-EM-wave-based radar, and can provide additional features for target identification and recognition. Simulations are given to validate the proposed theoretical analyses.
A covalent post-assembly strategy is developed to prepare a composite of dispersive MOF particles in an aerogel matrix. Briefly, the anhydride group-decorated MOF (UiO-66-NH 2 ) particles covalently ...coupled with polyimide (PI) monomers through a one-pot amidation polymerization reaction, succeeding a process of gel–sol, freeze-drying and thermal-imidization to obtain the UiO-66-PI aerogel. The designed composite shows outstanding catalytic activity in CO 2 cycloaddition and excellent adsorption capacity for dyes.
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