The effective operation of certain electronic, medical, industrial, and testing equipment relies on high-quality focusing imaging capability, which also plays a vital role in the field wave physics. Therefore, continuously improving resolution capacity is essential. However, homogeneous medium dominated by diffraction limit, best for could only reach half wavelength corresponding to lowest operating frequency, significantly hindering relevant application value. development phononic crystals...

Many advanced physical properties can be realized by using well-designed acoustic metamaterial (AM) structures, which have significant application value in engineering. In particular, thin-walled membrane, plate, and shell-type structures with deep subwavelength thicknesses that meet light weight requirements attracted the attention of many researchers engineers from various specialized fields. This Tutorial systematically introduced structural design methods, acoustic/elastic wave...

A space-shift phase-coherent cancellation acoustic metasurface is developed, which can achieve broadband low-frequency sound absorption via ultra-thin integrated structure composed of multiple units with weak capability. Through a design the channel length, large-size required in thickness direction for transferred into an extremely space layer. The gradient length are compactly arranged layer through folding, coplanar component working bandwidth exceeding octave and only λ/25 to λ/57...

We present an ultra-broadband acoustic metamaterial with inhomogeneous high-order Fabry–Pérot (FP) resonances that achieves near-perfect continuous absorption in the range of 400–10000 Hz. The unit is composed multiple FP channels cross-sectional areas, allowing for flexible adjustment impedance characteristics each channel. This approach prevents peaks’ resistances from increasing rapidly and ensures a smooth resistance characteristic across broad frequency range. As result, performance...

This work reports extraordinary topological properties of sound transmission through states in sonic crystals denominated by the Suzuki phase, consisting a rectangular lattice vacancies created triangular lattice. These low-symmetry exhibit unique due to embedded vacancies. A generalized folding method explains band structure and quasi-type-II Dirac point which is related underlying Analogous acoustic valley Hall effect, phase contains three types edge on four possible interfaces separating...

Abstract This paper proposes a novel bow-spring local resonance (LR) structure featuring an exceptionally wide low-frequency stopband. Unlike traditional methods reliant on heavy mass or stiffness adjustments, this effectively manipulates and amplifies the dynamic characteristics of negative solely by designing parameter values for set. Through finite element method analysis, ultra-wide stopband ranging from 91 to 570 Hz is achieved within LR structure. Further modification connection...

In this paper, impact attenuation and blast-wave mitigation are effectively realized by the dissipative stratified metamaterials with negative mass mechanism due to coupling of different resonators. To create a broad bandgap metamaterials, dispersion curve effective property investigated. It is found that effect resonators produced relative movement main masses can make original starting lower frequency, thus input waves could be blocked effectively. Simulation results show elastic...

Abstract Fans are integral equipment widely employed in both industrial settings and daily life. However, a persistent challenge fans design lies the inherent conflict between aerodynamic performance noise levels. Improving efficiency often results compromise of acoustic performance. To tackle this issue, we bionic method to craft novel axial fan impeller featuring curved hub serrated leading edges. The impact structural optimization on properties impeller, as well influence parameters these...

Purpose Relying on a multilevel approach, this paper investigates the day-to-day variations in family-supportive supervisor behaviors influencing subordinates' job stress, as well mediating role of positive emotions and moderating ethical leadership. Design/methodology/approach Using experience-sampling methodology, study collected data from 137 civil servants China who responded to one daily survey for 10 working days. Findings With total 1,370 surveys, results supported hypothesized model...

Purpose Although a plethora of literature has developed person–job fit theory, how leaders' emotions affect followers' received insufficient attention. Drawing on as social information (EASI) the present research study investigated impact positive and further explained mediating role psychological safety moderating effect organizational identification. Design/methodology/approach Data were collected from 319 Chinese employees nested in 67 teams, cross-level design was adopted to examine...

This work reports topological extraordinary properties of sound transmission through states in sonic crystals denominated Suzuki phase, consisting a rectangular lattice vacancies created triangular lattice. These low-symmetry exhibit unique due to the embedded vacancies. A generalized folding method explains band structure and quasi-type-II Dirac point which is related underlying In analogy acoustic valley Hall effect, phase contains three types edge on four possible interfaces separating...

Acoustic topological insulators have the excellent characteristic of pseudospin-dependent one-way transmission sound edge states immune to backscattering. We realize broadband acoustic pseudospin with subwavelength generalized insulators, which is achieved by reverse pseudospin-orbit coupling. The band and nontrivial bandgap can be adjusting structure scatterers introducing resonators. results demonstrate that resonator significantly reduce frequencies p -states d resonance scattering;...

Abstract. Although leader–member exchange (LMX) has been widely studied, knowledge about how followers influence the LMX process remains unknown. By integrating broaden-and-build theory (BBT) with emotion as social information (EASI) theory, we develop a follower-centric multilevel model to investigate followers' positive emotions have an impact on via mediating role of leader identification and moderating leaders' emotions. We conducted survey 319 Chinese employees from 67 teams. The...

Although leader-member exchange (LMX) has received burgeoning attention in recent decades, a majority of research focus on how leaders rather than followers affect LMX. Zooming the effect followers' emotions LMX, this study proposes that positive and leader identification is associated with further hypothesizes leaders' moderate relationship between Results from 319 Chinese employees show are positively related to Moreover, moderatethe

It is widely agreed that information systems security police compliance plays a pivotal role in safeguarding organizational security. This study empirically investigated and individual factors predicting employees’ ISSP compliance. With survey data of 525 civil servants China, results showed training climate were significantly related to Specifically, had stronger effect on than training. Furthermore, it was found perceived severity, vulnerability response efficacy positively We discussed...

Despite a lot of researches that examine person-job fit, the relationship between leaders' positive emotion and fit has attracted insufficient attention. Drawing on as social information theory (hereafter EASI), this study proposes multi-level moderated mediation model in which promote followers' via psychological safety indirect effect is by organizational identification. The contributes to related literature clarifying importance prompting math employees job.

Abstract Internet users’ cybersecurity psychology and cognition play an important role in their behavior. Taking 347 Chinese undergraduate students for example, this study assessed internet judgment its effect on behavior the Eastern countries. Results showed that average percentage correct of was 63.62%, had positive impact Furthermore, gender a moderating relationship between behavior, compared with female, more influence male’