International Journal of Precision Engineering and Manufacturing-Green Technology
The benefits of cutting fluids in machining are well known, but their use is accompanied by health and environment hazards. Moreover, strict environmental regulations make the manufacturers to switch over to dry turning, which is not feasible during machining of sticky material like stainless steel and Inconel etc. Therefore, the use of minimal quantities of lubricant (MQL) can be regarded as an alternative...
Due to concerns about environmental protection, product life cycle management for end-of-life has received increasing attention in many industrial sectors. To support these functions, crucial issues have been studied to realize a product recovery management system. Until the present time most research has been concerned with decision making under the assumption that all the relevant and accurate information...
Cellulose, the chain of glucose residues easily obtained from nature, is the most common natural polymer. Owing to its own unique material properties, compared to the conventional usage, nanocellulose (NC) with a crystalline structure can be considered to be used in various industrial applications. As a novel sustainable future material, we review the recent achievements of NC from the view point...
A Rapid Life Cycle Assessment (RLCA) method based on Green features is proposed in order to solve the inherent limitations of conventional Life Cycle Assessment (LCA), such as long period, massive data requirement, which result in difficulties in supporting product conceptual design. Firstly, Green Feature is proposed in supporting the LCA in conceptual design, where a mapping relationship is established...
The extended-range electric vehicle (E-REV) is an electric vehicle concept that has a light engine to allow an extended driving range. One of the most important features of these vehicles, based on electricity, is their ability to recover significant amounts of braking energy in a process known as regenerative braking. The more driving motor operates widely as generator, the more braking energy can...
Jacket structures are still at the early stage of their development for use in the offshore wind industry. The aim of this paper is to investigate the effect of the soil-structure interaction on the response of an offshore wind turbine with a jacket-type foundation. For this purpose, two different models of flexible foundation-the p-y model and the p-y model considering pile groups effect-are employed...
Sapphire wafers are widely used as substrates for fabricating gallium nitride light-emitting diodes. The quality of light-emitting diodes depends on the total thickness variation and BOW of the wafers. The multi-wire saw process is critical in determining post-processing times for steps such as diamond mechanical polishing and chemical mechanical polishing. In particular, thickness variation is affected...
The realization of lubricant free forming processes is motivated by an increasing demand for resource efficiency and higher environmental standards. Further potentials are the reduction of production steps and time. The dry conditions lead to an intensive interaction between tool and workpiece. Increasing friction and wear are the consequences. One approach to face these challenges is the implementation...
Demand for sapphire wafer has increased with growth of LED market. Chemical mechanical polishing (CMP) comprises a large part of wafering cost since the CMP process requires approximately 3–6 hours. For longer polishing times, the cost of consumables (COC) in CMP increases the total wafering cost; hence, considerable efforts have been made to decrease the polishing time of sapphire wafers to reduce...
Battery thermal management for electric or hybrid vehicles is crucial to prevent overheating and uneven heating across a battery pack. Thus, this paper provides a reliable and accurate co-simulation approach that can predict the thermal state inside a battery pack by the electrochemical responses of lithium-ion (Li-ion) battery cells. The approach is based on coupling an electric circuit model and...
We show that crack-free drilled structures with 25 μm hole size can be fabricated in the 12 μm-thick Permalloy foil by a nanosecond ultraviolet laser with low pulse energy and high repetition rate. The number of pulses required for drilling decreased with increasing pulse energy. The obtained hole exhibited a smaller size than the laser spot, implying that only the central part of a focused Gaussian...
Due to global warming and the rise of the CO2 emissions electric mobility is in the focus. In this case costs for li-ion batteries and especially the material costs are the main cost drivers for electric vehicles. The aim of this paper is to develop a material cost model which can evaluate cell chemistry alternatives for li-ion battery anodes and cathodes. A focus is set on innovative cell chemistries...
Manufacturing industry has been facing tremendous pressure on environmental regulations like the reduction of pollutants, e.g., carbon dioxide. Limited natural resources have driven manufacturing companies to seek ways to reduce energy consumption for daily production. Manufacturing industry needs to consider sustainability for green manufacturing during the entire product life cycle. Conventional...
This paper presents a horizontal active vibration isolator (HAVI) using both horizontal and vertical forces of an electromagnetic planar actuator (EPA). The horizontal force is used to reject horizontal disturbance while the vertical force is applied to adjust natural frequency of the HAVI. A simulation model of the active horizontal isolator with flexible beam column (FBC) is built and active isolation...
This paper demonstrates the effect of the extrusion ratio on the mechanical properties of the as-forged Mg-8Al-0.5Zn alloy. Three extruded Mg bars with the extrusion ratio of 9:1, 16:1, and 25:1 are prepared in the same extrusion condition, which are applied to the warm forging test to obtain the different microstructure with respect to the degree of extrusion effect in Mg alloys. The extrusion ratio...
Enhanced global trade forces companies to comply with a variety of environmental legislations each being subject to continuous modifications. During the past years the number of environmental legislations increased dramatically while law enforcement agencies expanded their active analysis of companies and their products. The number of companies being accused to sell non-compliant products by both...
In this study, we design a lightweight antenna-supporting structure for a vehicle-mounted radar system using a multiphase design exploration method. In the first phase of the approach, structural topology within a given design domain is optimized in order to reduce the weight and increase the structural integrity applying various design scenarios, which provides several preliminary structural layouts...
The achievement of obtaining low contact resistivity between silver electrodes and the emitter layer of a crystalline silicon solar cell has been a constant issue for the silver paste developers in crystalline silicon solar cell industries. However, it has been found that there are factors that significantly distort the accurate characterization of contact resistivity. One group of such factors have...
Recently, cost effectiveness and environmental consideration have become essential issues in the fabrication techniques. In this study, microlens array has been fabricated with simple processes. On a silicon substrate, which has circular micro holes, photoresist mixture has been coated using the spin coating process. The process has been conducted for various spin speeds to change the centrifugal...
By the quick growth of wind power generation in the world, this clean energy becomes an important green electrical source in many countries. However, volatile and non-dispatchable nature of this energy source motivates researchers to find accurate and robust methods to predict its future values. Because of nonlinear and complex behaviors of this signal, more efficient wind power forecast methods are...