flexible structure
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2022 ◽  
pp. 214-235
Author(s):  
Konur Alp Demir

In this chapter, an analysis of the electronic decision making system, which is thought to benefit from the heavy bureaucratic system which does not take into account the expectations of the citizen in the public administration system, will be used to make a more flexible structure. The focus of this chapter is on the need to design the decision-making mechanisms of the state according to the expectations of the citizen. For this purpose, requests and complaints from the citizens through the electronic environment should be taken into consideration in the decision-making process. In fact, this situation is reflected in the application of electronic participation management model. The application of this management model in the public administration system is the citizen participation complaint and demand system which is carried out under the name of electronic government. The examination of this system, which is an example of the application of participatory democracy, is important for the reflection of democratic values on the administration system.


2022 ◽  
pp. 410-431
Author(s):  
Konur Alp Demir

In this chapter, an analysis of the electronic decision making system, which is thought to benefit from the heavy bureaucratic system which does not take into account the expectations of the citizen in the public administration system, will be used to make a more flexible structure. The focus of this chapter is on the need to design the decision-making mechanisms of the state according to the expectations of the citizen. For this purpose, requests and complaints from the citizens through the electronic environment should be taken into consideration in the decision-making process. In fact, this situation is reflected in the application of electronic participation management model. The application of this management model in the public administration system is the citizen participation complaint and demand system which is carried out under the name of electronic government. The examination of this system, which is an example of the application of participatory democracy, is important for the reflection of democratic values on the administration system.


2021 ◽  
Vol 53 (6) ◽  
pp. 210605
Author(s):  
Iwan Prasetiyo ◽  
Gradi Desendra ◽  
Khoerul Anwar ◽  
Mohammad Kemal Agusta

Several studies have been devoted to increasing the attenuation performance of the Helmholtz resonator (HR). One way is by periodic coupling of HRs in a ducting system. In this study, we propose a different approach, where a membrane (or a thin flexible structure in general) is added to the air cavity of a periodic HR array in order to further enhance the attenuation by utilizing the resonance effect of the membrane. It is expected that three attenuation mechanisms will exist in the system that can enhance the overall attenuation, i.e. the resonance mechanism of the HR, the Bragg reflection of the periodic system, and the resonance mechanism of the membrane or thin flexible structure. This study found that the proposed system yields two adjacent attenuation peaks, related to the HR and the membrane respectively. Moreover, extension of the attenuation bandwidth was also observed as a result of the periodic arrangement of HRs. With the same HR parameters, the peak attenuation by the membrane is tunable by changing its material properties. However, such a system does not always produce a wider attenuation bandwidth; the resonance bandwidths of both mechanisms must overlap.


2021 ◽  
Vol 12 (1) ◽  
pp. 14
Author(s):  
Tran Nguyen Lam Giang ◽  
Catherine Jiayi Cai ◽  
Godwin Ponraj ◽  
Hongliang Ren

The steady rise of deployable structures and mechanisms based on kirigami and origami principles has brought about design innovations that yield flexible and lightweight robots. These robots are designed based on desirable locomotion mechanisms and often incorporate additional materials to support their flexible structure to enable load-bearing applications and considerable efficient movement. One tetherless way to actuate these robots is via the use of magnets. This paper incorporates magnetic actuation and kirigami structures based on the lamina emergent mechanism (LEM). Three designs of magnetic-actuated LEMs (triangular prism, single LEM (SLEM), alternating mirror dual LEM (AMDLEM)) are proposed, and small permanent magnets are attached to the structures’ flaps or legs that rotate in response to an Actuating Permanent Magnet (APM) to yield stick-slip locomotion, enabling the robots to waddle and crawl on a frictional surface. For preliminary characterization, we actuate the three designs at a frequency of 0.6 Hz. We observed the triangular prism, SLEM, and AMDLEM prototypes to achieve horizontal speeds of 4.3 mm/s, 10.7 mm/s, and 12.5 mm/s on flat surfaces, respectively. We further explore how changing different parameters (actuation frequency, friction, leg length, stiffness, compressibility) affects the locomotion of the different mechanisms.


2021 ◽  
Vol 22 (22) ◽  
pp. 12122
Author(s):  
Agnieszka Markowska ◽  
Adam Roman Markowski ◽  
Iwona Jarocka-Karpowicz

6-aminohexanoic acid is an ω-amino acid with a hydrophobic, flexible structure. Although the ω-amino acid in question is mainly used clinically as an antifibrinolytic drug, other applications are also interesting and important. This synthetic lysine derivative, without an α-amino group, plays a significant role in chemical synthesis of modified peptides and in the polyamide synthetic fibers (nylon) industry. It is also often used as a linker in various biologically active structures. This review concentrates on the role of 6-aminohexanoic acid in the structure of various molecules.


Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6548
Author(s):  
Peng Liao ◽  
Jiyang Fu ◽  
Wenyong Ma ◽  
Yuan Cai ◽  
Yuncheng He

According to the engineering phenomenon of the galloping of ice-coated transmission lines at certain wind speeds, this paper proposes a novel type of energy harvester based on the galloping of a flexible structure. It uses the tension generated by the galloping structure to cause periodic strain on the piezoelectric cantilever beam, which is highly efficient for converting wind energy into electricity. On this basis, a physical model of fluid–structure interaction is established, and the Reynolds-averaged Navier–Stokes equation and SST K -ω turbulent model based on ANSYS Fluent are used to carry out a two-dimensional steady computational fluid dynamics (CFD) numerical simulation. First, the CFD technology under different grid densities and time steps is verified. CFD numerical simulation technology is used to simulate the physical model of the energy harvester, and the effect of wind speed on the lateral displacement and aerodynamic force of the flexible structure is analyzed. In addition, this paper also carries out a parameterized study on the influence of the harvester’s behavior, through the wind tunnel test, focusing on the voltage and electric power output efficiency. The harvester has a maximum output power of 119.7 μW/mm3 at the optimal resistance value of 200 KΩ at a wind speed of 10 m/s. The research results provide certain guidance for the design of a high-efficiency harvester with a square aerodynamic shape and a flexible bluff body.


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