sensitive structure
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2022 ◽  
Vol 148 ◽  
pp. 107697
Author(s):  
Felipe Oliveira Barino ◽  
Renato Luiz Faraco-Filho ◽  
Deivid Campos ◽  
Alexandre Bessa dos Santos

Author(s):  
Xingfu Ma ◽  
Zhinong Li ◽  
Jiawei Xiang ◽  
Chengjun Wang

In this paper, a novel phoxonic crystal (PxC) structure composed of silicon, with optimal dual phononic band gap (PNBG) and photonic band gap (PTBG), is presented. Using the finite element analysis method, both the transmission characteristics and dispersion relation of PNBG and PTBG are calculated, and the existence of dual BGs is demonstrated by the means of the analysis of transmission for the PxC structure. The influences of structural parameters on the dual forbidden band characteristics are further explored, the sensitive structure parameters can be determined: the width of elastic beams, the length of square silicon, and the length of square hole. Using the orthogonal test, 25 experimental runs based on 3-factor and 5-level experiment are performed to finish the numerical experimental design and analysis. Four functional relationships can be acquired between the three sensitive parameters and dual BGs. Finally, the unified objective function method is employed to perform the construction of the single objective optimization model for the purpose of obtaining the optimal dual BGs and the corresponding optimal parameter combinations of the PxC structure. Such scheme can be used as the potential optimization way, which may find wide application in the development and design of PxCs.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ran Sun ◽  
Budi Rahmadya ◽  
Fangyuan Kong ◽  
Shigeki Takeda

AbstractThis paper proposes a visual management scheme of medical things with a color-change radio frequency identification (RFID) tag. The color-change RFID tag employs a specific RFID tag integrated circuit (IC) and a laminated pH-indicating paper. The IC has energy harvesting and switched ground functions, which enable it to generate electricity to the laminated pH-indicating paper. This phenomenon causes electrolysis of NaCl solution absorbed in the laminated pH-indicating paper. Electrolysis generates alkaline matter to change the color of the pH-indicating paper. This paper gives a new and sensitive structure of the laminated pH-indicating paper. The proposed advanced color-change RFID tag with new laminated pH-indicating paper succeeds in changing its color noticeably at a 1 m distance using an RFID reader radiating 1 W radio waves. The color change was observed 3–5 s after starting radio wave irradiation. The results of this experiment also confirm that the changed color can be held for over 24 h. Furthermore, two demonstrations of the visual management system of medical things (patient clothes and sanitizers) are presented.


Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1413
Author(s):  
Rui-Rong Wang ◽  
Hao Guo ◽  
Jun Tang ◽  
Jin-Ping Liu ◽  
Li-Shuang Liu

A force-sensitive structure of an InAs Quantum Dot (QD) embedded in a high electron mobility transistor (HEMT) is presented in this paper. The size of an InAs QD is about 30 nm prepared by the S-K growth mode, and the force-sensitive structure is fabricated by molecular beam epitaxy (MBE). The force-sensitivity characteristic of the QD HEMT is studied by the electrical and mechanical properties. The electrical characteristics show that the InAs QD-HEMT has linear, cut-off, and saturation operating states, and produces different output currents under different gate voltages, which shows that the structure is reasonable. Furthermore, the results of the output characteristics under different pressure show that the output voltage of the QD-HEMT decreases with the increase in pressure, which indicates that the InAs QD-HEMT has a vital mechanical–electrical coupling characteristic. The output voltage of the InAs QD-HEMT in the range of 0–100 kPa shows that the sensitivity was 1.09 mV/kPa.


Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4908
Author(s):  
Peng Wang ◽  
Yifeng Zhong ◽  
Zheng Shi ◽  
Dan Luo ◽  
Qingshan Yi

The orthogrid-stiffened FRP panel (OSFP) is a generic structural element in weight-sensitive structure applications. Based on the variational asymptotic method, a 2D reduced-order plate model (2D-RPM) of OSFP was constructed through matching the strain energy of the original panel for static and dynamic analyses. The local field distributions were recovered using the recovery relationship and global response. The relative influences of select parameters on the effective performance of the OSFP were revealed by parametric studies. The comparative results showed that the effective performance of the OSFP predicted by the 2D-RPM were consistent with those predicted by the 3D finite element model, but the computational efficiency was greatly improved. The stiffener height had the greatest influence on the natural frequency of the panel. The layup configurations of laminates had significant influences on the equivalent stiffness and buckling load of the OSFP but had little effect on the vibration modes, which could be varied by adjusting the stiffening forms.


2021 ◽  
Author(s):  
Florian Bleibinhaus ◽  
Bernd Trabi

<p>Seismic vibrations induced by mine blasting are often a nuisance to residents and may even threaten the integrity of sensitive structure in the vicinity of mines. In this study we investigate the potential to reduce such vibrations through the interference with a second blast sequence. Assuming perfectly repeatable source wavelets and an acoustic, homogeneous model, we predict the radiation patterns of blast sequences with the Fourier shift theorem as a function of azimuth and incidence, and we benchmark those predictions with observations from a seismic array deployed at the iron ore mine Mt Erzberg, Austria. We then use our model to optimize the delay times of blast sequences with an inverse algorithm geared towards minimizing the predicted vibrations in certain target zones. Due to its symmetry, a single row of blasts has no azimuthal reduction potential. A second, quasi-simultaneous mine blast can, however, reduce blast-induced vibrations by up to 20% according to our model. In this study, we discuss the principles and the potential of this approach to vibration reduction. In a second study, we will present applied results obtained with a fully elastic model.</p>


2021 ◽  
Vol 34 (3) ◽  
pp. 570-589
Author(s):  
Feim Blakçori ◽  
Jeremy Aroles

PurposeIn an ever-complexifying business context, organizations need to continuously adapt, adjust and change their routines in order to remain competitive. Drawing upon a qualitative study focusing on three Southeastern European countries (Greece, Bulgaria and Serbia), this paper explores the role played by managerial feedback on routine change within small and medium enterprises (SMEs).Design/methodology/approachThe authors draw from an in-depth qualitative study of six manufacturing SMEs located in three Southeastern European countries: Greece, Bulgaria and Serbia. The process of data collection, which spanned over a period of fifteen months, was centred around both interviews and observations.FindingsThe authors argue that feedback is a powerful and constructive managerial practice that sets to initiate changes in routines through three different means: (1) making sense of the changes required (by channelling information), (2) rationalizing the decision for changing the unproductive routines and (3) reviewing the process of change through the legitimization of situational routines. In addition to this, the authors found that managers perceive that routines need to change for four main reasons: inability to meet targets (e.g. performance); too cumbersome to deal with complex environments; inflexibility and failing to provide control; obsolete in terms of providing a sense of confidence.Practical implicationsThis research provides evidence that feedback is an important managerial means of changing routines in informal, less bureaucratic and less formalized workplaces such as SMEs. Managers might embrace deformalized approaches to feedback when dealing with routines in SMEs. Working within a very sensitive structure where the majority of changes on routines need to be operationalized through their hands, managers and practitioners should deploy feedback in order to highlight the importance of routines as sources of guiding actions, activities and operations occurring in SMEs that create better internal challenges and processes.Originality/valueThe authors’ research suggests that routines are subject of change in dynamic and turbulent situations. Perceiving routines as antithetical to change fails to capture the distinctive features of change such as its fluidity, open-endedness, and inseparability. Likewise, the authors claim that routines are socially constructed organizational phenomena that can be modulated in different ways in SMEs.


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