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Reconfigurable lens provides variable-focus in optics without any moving part. The material for a reconfigurable lens should be deformable in the presence of external stimuli meanwhile maintaining its optical transparency for the lens function. This article reports the fabrication and actuation property of the Poly(acrylic acid)-Poly(vinyl alcohol) (PAP) hydrogels for reconfigurable active lens. The...
Off-grid power system is well acknowledged as a viable alternative to grid extension in rural areas of developing countries. A significant portion of such projects has been installed in many developing countries through government subsidy program or donorfunded projects. Follow ups are necessary for the detailed analysis of the project results and to correctly determine the impact of the project and...
Silicon (Si) nanowires have been widely used as sensor and heater in various fields such as biology and chemistry due to its high sensitivity and fast responsivity. In this paper, we measured the temporal response property of Si nanowire-heater through infrared microscopy. Nanowire-heaters were fabricated using silicon-on-insulator (SOI) wafer with Si heights of 15 μm and 30 μm, respectively. In order...
Residual vibration of the system base due to the rapid acceleration of a motion stage may significantly reduce life span and productivity of the manufacturing equipment. Although a passive reaction force compensation (RFC) mechanism was developed to reduce the residual vibration of a linear motor motion stage, the passive RFC cannot adjust its dynamic characteristic against the motion profile variation...
Using an improved multilayer-beams model, the surface effect caused by surface stress and surface elasticity on mechanical properties of laminated nanobeams in bending, bucking and vibration is incorporated into the nonlinear beam theory. Analytical solutions are obtained to study the influence of surface and interface effects for simply supported boundary conditions. Unlike the deduction of previous...
Nowadays, the need for not only technically but also environmentally efficient machining processes is increasing. In this context, the reduction of oil emulsion type coolants used during machining of aeronautical engine components supposes a great challenge. In this paper, a novel approach based on the design, optimization and validation of a nozzle adaptor combining cryogenic technology and minimum...
In this study, a hybrid composite material was fabricated by stacking carbon fiber-reinforced plastic on CR340 plates to increase the specific strength and specific stiffness, compared to thick boron steel plates or dual-phase steels. A deep drawing test was conducted for this hybrid composite material, using various blank holding force, to assess its formability and potential use in vehicle parts...
In machine tools, hydraulic units are one of the main consumers of energy. Hydraulically driven functionalities of machine tools include tool clamping, tool change, work piece clamping or palette change operating. For these functions, two pressure circuits (60 bar and 200 bar) are necessary. This paper introduces a novel, energy-efficient hydraulic unit that combines a variable displacement pump with...
wChemical mechanical polishing (CMP) is the dirtiest semiconductor process using a slurry containing chemicals and abrasives. CMP process consumes a huge amount of slurry, which affects environmental sustainability negatively. The semiconductor industry has attempted to evaluate and reduce the carbon dioxide equivalent (CDE) for environmental sustainability. In this study, the environmental impact...
This paper presents a new energy management control strategy of a hybrid electric vehicle, using dynamic programming with preview driving cycle information. Dynamic programming is a promising solution for energy management problem of the hybrid electric vehicle, yet global optimality can only be achieved with preview driving cycle information due to its non-causal property. As recent driving cycle...
The twenty-first century is a knowledge-based and increasingly environmental age. Many countries are introducing new policies and production concepts that are consistent with these trends. Recently, interest in recycle, reuse and remanufacturing technologies has been increasing, with the eco-friendly and energy-efficient production. One of these eco-friendly production methods, remanufacturing, is...
Recently, the aluminum–air (Al–air) battery has spotlighted since its low cost, sustainable properties, and high theoretical potential. To improve battery performance, several approaches for Al anode modification have been introduced, such as alloy processes, metal oxide deposition, etc. However, such processes could induce critical side effects during battery operation for example, by-product creation...
The tire pressure monitoring system (TPMS) research is mostly concentrated in the ultralow-power circuit field. However, one of the biggest challenges is overcoming the unavoidable replacement of batteries owing to their self-discharging, unstable performance by using the energy-harvesting technology. A TPMS must be installed on the wheel surface for permanent operation. Likewise, the energy harvester...
The thermal barrier coating (TBC) is applied to gas turbine components to protect the hot-section components from extremely high temperature condition. Since metallic substrate cannot endure such severe condition of gas turbines, the delamination of the TBC can cause the failure of the whole system. Thus, the delamination life of the TBC is one of the most important issues for designing the hot-section...
As well as the micro patterns, many functional surfaces exhibit micro/nano hierarchical patterns. Micro- and nano-patterned surfaces can be fabricated using various techniques including photolithography, electron-beams, and so on. However, these processes were developed for semiconductor fabrication and are not convenient for large-area applications. In this paper, we describe a manufacturing process...
Brush plating is one of the remanufacturing technologies which have been widely used in engine remanufacturing. In this paper, α-Al2O3/Ni composite coatings were prepared on the inner hole face of the big end of connecting rod by a self-made automatic plating machine. To investigate the effects of process parameters on residual stresses of α-Al2O3/Ni composite coating, a L16(44) orthogonal experiment...
Natural fibers and bio-based composites are competitive to conventional materials in structural and transportation industry. Natural fibers reinforced polymer matrix composites are familiar/common materials currently. Various properties of these composites have been explored in the already available literature, and has been continuing with new developments. They have a risk of flammability in most...
In this study, NiCrAl metal foam was used as the support material. Rh/Al-Ce-Zr-based catalysts were also used as a reforming catalyst, and was coated over a metal foam plate using a rotary vacuum evaporator. The Al-Ce-Zr-based catalytic support material coated over a metal foam plate exhibited a nano-structured morphology. XRD showed that the cerium and zirconium components in the Al-Ce-Zr-based catalytic...
Carbon-fiber-reinforced thermoplastic (CFRTP) laminate undergoes large deformations and slip between each layer during the prepreg compression forming (PCF) process. Particularly, the formability of CFRTPs varies for each layer as a result of the temperature difference during heat transfer between tool and laminate because of the viscosity of resin. These behaviors affect the final product quality...
Titanium-based alloys are commonly applied in high-performing structural components. Their machinability could be penalized by severe tool wear and poor surface quality. As a result, cutting fluids are widely used to improve the production rate without negatively affecting the machined surface integrity and the tool life. The experimental research activities presented in this paper are focusing on...
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