비금속 재질인 PB, PE, PVC 수도관을 대상으로 염소 노출에 의한 물리⋅화학적 구조변화를 관찰하여 내구성에 미치는 영향을 평가하고자 하였다. 염소 노출은 NaOCl을 적용하여 0.4에서 2.1 g⋅hr/L의 노출 강도가 높아짐에 따라 PE, PB의 표면 형상 변화는 결정화와 Crack이 일어남을 확인할 수 있었다. 또한 ...

This research addresses a pivotal challenge in advancing the hydrogen economy: developing efficient storage systems that cater to diverse applications. Cryogenic liquid hydrogen is investigated for its superior gravimetric ...

In response to maritime emission regulations, the demand for marine waste heat recovery systems is progressively critical. This study investigates the dynamic stability and thermodynamic performance of a marine organic ...

Driven by the urgent need to combat climate change and ensure a sustainable energy future, this study explores green hydrogen production using a hybrid machine learning (ML) model applied to a photovoltaic-thermal (PVT)–Rankine ...

This study presents an experimental evaluation on R410A and its substitute R454B under the drop-in replacement solution. When cooling water temperature varies from 16 to 26 °C, condensation pressure of R454B is approximately ...

This study investigates the performance of a household freezer operating on a single-stage vapor compression refrigeration cycle through first- and second-law thermodynamic analyses. Experimental tests were conducted at ...

This research focuses on the intelligent transformation demands of fire zone sealing construction in underground coal mines, building a 3D printing system with a six-axis robotic arm at its core, designing an integrated ...

Multi-objective optimization of turning processes remains challenging due to nonlinear and conflicting relationships between productivity, surface quality, and cutting forces. While many existing approaches rely on limited ...

Abrasive water jet (AWJ) has notable advantages in cutting special and difficultto-machine materials due to its cold machining property and high-efficiency material removal. However, complex material removal factors ...

To address the loosening issue of bolted joints—a critical challenge that impairs the reliability of mechanical systems—this study first establishes a theoretical loosening model with bolted joint as the research object. ...