Abstract

Superplastic alloys exhibit extremely high ductility (>300%) without cracks when tensile-strained at temperatures above half of their melting point. Superplasticity, which resembles the flow behavior honey, is caused by grain boundary sliding in metals. Although several non-ferrous and ferrous superplastic are reported, practical applications limited due to material cost, low strength after forming, deformation temperature, complicated fabrication process. Here we introduce a new...

This study aims to validate the large-scale application of self-sensing concrete in airport runway pavements and use electrical resistance tomography (ERT) for characterizing spatially distributed damage during accelerated pavement testing. not only retains expected mechanical properties typical pavements, but it can also sense deformation strain. First, sensing were encoded by modifying cement-aggregate interface with multi-walled carbon nanotube (MWCNT) thin films. MWCNT films spray-coated...

This research describes the micro‐mechanical behavior of an Al–Mg alloy system synthesized from two separate commercial Al‐1050 and ZK60 alloys through application high‐pressure torsion (HPT) for five turns at room temperature. The essential mechanical characteristics are observed corresponding phases in a multi‐layered structure disk center but edge contains metal matrix nanocomposite (MMNC) exhibiting apparent plastic instability decreasing strain rate sensitivity under rates 10 −4 −10 −3...

In this work, a mechanical vibrational analysis of an ultrasonic atomizer is carried out to control its atomization mass transfer rate. An device constructed with piezoelectric ring coupled metallic circular thin plate micro-apertures. The mechanism by complex phenomenon model because the coupling effect between fluid and dynamic mechanics controlled vibrating element. Here, micro-apertures shape meshed during vibration, as well resonance frequency modes, are numerically studied using finite...

This study reports the design, fabrication, and characterization of first 3D-printed peristaltic pumps for creating maintaining dry vacuum in compact systems. The implement a novel actuator design with notched cross-section that requires less than half force to fully seal, making it possible create maintain low at actuation speed. devices are made via multi-material extrusion: rigid parts polylactic acid (PLA), while compliant FiberFlex 40D—a relatively new flexible material is easier print...

The processing of metals through the application high-pressure torsion (HPT) provides potential for achieving exceptional grain refinement in bulk metals. Numerous reports are now available demonstrating HPT to a range pure and simple alloys. In practice, excellent is achieved using this technique with average size often reduced true nano-scale range. Contrary significant during HPT, models hardness evolution very different depending upon material properties. For better understanding...

Severe plastic deformation is an attractive processing method for refining microstructures of metallic materials to have ultrafine grain sizes within the submicrometer or even nanometer levels. Especially, it becomes generally known that metals through application high-pressure torsion (HPT) provides potential achieving exceptional refinement in bulk disk metals. In present study, a ZK60A magnesium alloy was processed by HPT at room temperature series numbers revolutions under constant...

The objective of this study was to develop a noncontact, noninvasive, imaging system for monitoring the strain and deformation states osseointegrated prostheses. proposed sensing methodology comprised two parts. First, passive thin film designed such that its electrical permittivity increases in tandem with applied tensile loading decreases while unloading. It found patterning films could enhance their dielectric property's sensitivity strain. can be deposited onto prosthesis surfaces as an...

Soft robotics are receiving great attention due to its compliant nature and potential for achieving high degree-of-freedom motions, which essential mimicking bioinspired systems. Various methods have been developed actuate soft materials, ranging from pneumatic actuation implementing phase transformation. However, techniques that involve fluid pressure require tethered tubes external compressors, whereas transformation generally relies on temperature changes. In this study, a novel method of...

Severe plastic deformation (SPD) is an attractive processing method for refining microstructures of metallic materials to give ultrafine grain sizes within the submicrometer even nanometer levels. Experiments were conducted discuss evolution hardness, microstructure and strain rate sensitivity, m, in a Zn-22% Al eutectoid alloy processed by high- pressure torsion (HPT). The data from microhardness nanoindentation hardness measurements revealed that there significant weakening Zn-Al during...

Soft material actuation is a promising field that can potentially solve several limitations of traditional robotic systems. These systems comprise soft and flexible materials to achieve high degrees freedom compliance with their surroundings. One method actuate such structures vaporize liquid embedded inside the material. The elastomers are inflated since generated vapor occupies much larger volume after phase transformation. simplest widely used design liquids installing heating element...

대형녹조류인 Ulva pertusa는 전 세계 연안에 서식하는 저서성 종으로 대발생 또는 인공구조물에 착생되어 경제적, 사회적인 측면에서 문제를 야기시키고 있다. 착생생물을 제어하기 위해 신방오제인 ziram, diruon, zinc pyrithione (ZnPT), copper pyrithione(CuPT), DBNPA, triclosan 등이 방오도료로 사용 중이나, 대형 및 미세조류를 이용한 신방오 제들의 방오능 검증과 기초적인 연구자료가 부족한 실정이다. 따라서 본 연구에서는 초기 우점착생종인 구멍갈파래의 포자를 이용하여 방오제의 효능을 검증하고 생체막 형성의 우점종인 미세조류 Nitzschia pungens를 방오능을 검증하였다. 구멍갈파래포자의 운동성 검증에서 ziram과 ZnPT는 diuron, CuPT, triclosan보다 50% 높은 억제를 나타내었고 착생 검증에서는 ziram이 가장 낮은 착생률 1%로 나타났으며 CuPT는 100 μg/L의 농도에서 다른...

In this study, the proximate composition of Pyropia dentata was compared by analysis minerals and amino acids that were produced at Seocheon, Chungcheongnam-do Wando Jangheung, Jeollanam-do. Moisture, ash crude proteins analyzed using AOAC method, lipid Soxhlet inorganic performed ICP-OES. Amino acid used for analyzer. The analysis, moisture content, maximum values displayed in while content appeared Jangheung's Pyropia. Crude Seocheon's amount lipid, carbohydrate Wando's Inorganic calcium,...