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Flow stress modeling of a new HSLA steel by Zerilli-Armstrong model

materials Today: Proceedings 2023年 91卷 131-137页

作者： Bishal Kanrar Subrata Mukherjee debdulal das Department of Metallurgy and Materials Engineering Indian Institute of Engineering Science and Technology Shibpur Howrah 711103 India Material Characterisation Research Group R&D Division Tata Steel Limited Jamshedpur 801101 India

The selection of an appropriate constitutive model is vital for the design of thermo-mechanical treatment as it describes the flow patterns and governs the metallurgical transformations. In this research, the constitutive behavior of a newly developed high-strength steel has been studied employing a physical-based Zerilli-Armstrong model. For this purpose, the experimentally generated stress–strain data from isothermal compression tests performed over a wide range of temperatures (1073–1323 K) and strain rates (0.01–10 s −1 ) have been considered. The constitutive relationships of flow stress as functions of temperature, strain rate, and true strain have been developed for both original and modified Zerilli-Armstrong models. The comparison between the measured and predicted flow stresses demonstrates better predictability of the modified model with a higher correlation coefficient (r = 0.982) and a much lower average absolute relative error (AArE = 7.31%) since the values of r and AArE for the original model are 0.845 and 23.96%, respectively. The better accuracy of the modified Zerilli-Armstrong model is attributed to the fact that it additionally considers the coupled effects of temperature and strain, unlike the original Zerilli-Armstrong model.

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BOE-ziSIM: A design-technology-Manufacturing Co-optimization Platform

BOE-ziSIM: A Design-Technology-Manufacturing Co-optimization...

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Advanced Patterning Solutions (IWAPS), International Workshop on

作者： Nan Liu Zhizhao Zhang Shantao Chen Lisong dong Hong Wang Technology R&D Center Beijing Zhongxiangying Technology Co. Ltd Technology R&D Center Beijing Zhongxiangying Technology Co. Ltd Beijing China Panel Technology Development BOE Technology Group Co. Ltd. Beijing China Institute of Microelectronics of Chinese Academy of Science Beijing China Beijing Zhongxiangying Technology Co. Ltd Beijing China

Thin-film transistors (TFT) and organic light-emitting diodes (OLEd) for display applications involve new materials, structures and processes in the design and development phase, and these elements can have a significant impact on the performance of the TFT devices. The increasing need for personalized and diversified display productions brings two problems: 1. To achieve the desired performance indicators in fabrication processes, a large number of experiments are required to continuously optimize the process parameters, which not only increases economic and time costs but also limits the development speed of new productions. 2. The display production iterations are getting faster to meet the market requirement, in other words, the time left for yield improvement becomes shorter. A design-technology-Manufacturing Co-optimization platform called BOE-ziSIM is introduced in this paper, it was developed to solve the above mentioned problems, the experiment results show that the defects analysis time is reduced from hours to minutes, and the equipment adjustment time is reduced from days to minutes.

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rF rectifier design for Efficient WPT in Medical Implants: A Wideband Approach for White Space WiFi and LTE Applications

RF Rectifier Design for Efficient WPT in Medical Implants: A...

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Asia-Pacific Conference on Applied Electromagnetics, APACE

作者： Surajo Muhammad Jun Jiat Tiang Suhandi Bujang Center for Intelligent Network Telekom Research & Development (TM R&D) Sdn Bhd TM Innovation Centre Cyberjaya Malaysia Centre For Wireless Technology Faculty of Engineering Multimedia University Cyberjaya Malaysia

ISBN: (数字)9798350364163

ISBN: (纸本)9798350364170

This paper presents a unique design approach for a high-efficiency wideband rF rectifier, which incorporates a two-branch cell configuration combined with an L-shunt matching network (MN), a radial stub, and a series inductor. The rectifier has been optimized to achieve peak power transfer efficiency across the 2.37–2.70 GHz frequency range, making it well suited for white space Wi-Fi and LTE applications. Simulation results indicate promising performance, with a maximum power conversion efficiency (PCE) of 66.25% at an input power level of 5 dBm. Furthermore, the rectifier achieves rF-to-dC conversion efficiencies between 11.50% and 13.5% at -20 dBm, demonstrating its effectiveness across a range of input power levels. designed on an rT/duroid substrate, the rectifier has a compact footprint of 19.75 mm × 15.20 mm and utilizes a single-series diode (SSrd) architecture. The design employs a sequential matching technique to ensure a wide impedance bandwidth, enabling efficient utilization of the targeted frequency spectrum. This work highlights the potential of the proposed rectifier for wireless power transfer applications in biomedical implants, particularly in scenarios where ambient power management is critical.

关键词： radio frequency rectifiers Implants Computer architecture Wireless power transfer White spaces Wireless fidelity Wideband Long Term Evolution Substrates

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Mussel-inspired modification of 2d MoS2 to construct a hybrid nanocomposite membrane with enhanced pervaporation dehydration of isopropanol

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Journal of Environmental Chemical Engineering 2024年第1期12卷

作者： Gallardo, Marwin r. Ciou, Jyun-Xiang Wang, Chen-Hsiu Ang, Micah Belle Marie Yap Millare, Jeremiah C. Li, Chi-Lan Tsai, Hui-An Huang, Shu-Hsien Lee, Kueir-rarn R&D Center for Membrane Technology and Department of Chemical Engineering Chung Yuan Christian University Taoyuan32023 Taiwan School of Chemical Biological and Materials Engineering and Sciences Mapúa University Manila1002 Philippines Department of Chemical and Materials Engineering National Ilan University Yilan26047 Taiwan

In this work, a thin-film nanocomposite (TFN) membrane was constructed using a hybrid polydopamine (Pd)-MoS2 (MoS2@Pd) filler for pervaporation dehydration of isopropanol. The exfoliated MoS2 was first modified through bio-inspired coating of Pd. The resulting MoS2@Pd with different weight ratio with respect to PEI was then deposited into the hydrolyzed polyacrylonitrile support through pressure-assisted filtration, followed by crosslinking with trimesoyl chloride. Characterization experiments were performed with the membranes using Attenuated Total reflectance Fourier Transform Infrared Spectroscopy, X-ray Photoelectron Spectroscopy, Energy-dispersive X-ray Spectroscopy, Field Emission Scanning Electron Microscopy, Atomic Force Microscopy, and water contact angle analyses. The Pd serves as a bridging agent between MoS2 and the crosslinked PEI, enhancing the membrane's physicochemical properties, including surface morphology and hydrophilicity. For membrane performance on pervaporation dehydration of 70/30 wt% isopropanol/water mixture at 25 °C, the addition of MoS2@Pd led to a simultaneous increase in permeation total flux and water content in the permeate. Notably, MoS2@Pd0.3-TFN membrane demonstrated a permeation flux of 2870.10 g∙m−2∙h−1 and 0.86/99.14 wt% isopropanol/water permeate mixture. The membrane also maintained stable performance under varying feed concentration, feed temperature, and long-term operations. This study contributes valuable insights into the development of MoS2-based membrane with enhanced pervaporation separation performance. © 2023 Elsevier Ltd

关键词： Scanning electron microscopy

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Thermal Cycling Performance of Heterogeneous Sn-Ag-Cu Solder Joint with Minor Elements Addition 26

Thermal Cycling Performance of Heterogeneous Sn-Ag-Cu Solder...

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26th Electronics Packaging technology Conference, EPTC 2024

作者： Bae, Joo Young Kim, Mi-Song Hong, Won Sik Yoo, Sehoon Moon, Jeong Tak Park, Sang-Bok Kang, Nam Hyun Korea Electronics Technology Institute Saenari-ro Seongnam-si Gyeonggi-do13509 Korea Republic of Korea Institute of Industrial Technology Gaetbeol-ro Incheon21999 Korea Republic of Solder Development Team R&D Center MK Electron Co. Ltd. Yongin-si Gyeonggi-do17030 Korea Republic of SNF Co. Ltd. 20 Singi-ro Yongin-si Gyeonggi-do17059 Korea Republic of Department of Materials Science and Engineering Pusan National University Busandaehak-ro 63 beon-gil Busan46241 Korea Republic of

ISBN: (纸本)9798331522001

Coarse intermetallic compound (IMC) formation can lead to brittleness and generate cracks between the solder and the IMC interface under printed circuit board (PCB) warpage. Microstructure of the solder joint is closely related to its thermo-mechanical properties. Thus, it is essential to control the microstructure of the solder joint. Ball grid array (BGA) packages with 300 μm diameter Sn-3.0Ag-0.5Cu (SAC305) and Sn-2.5Ag-0.8Cu-0.05Ni-1.0Bi (SAC(-Ni,Bi)) solder balls were soldered with SAC305 solder paste on the PCB coupon. These combinations of homogeneous (SAC305 solder ball and paste) and heterogeneous (SAC(-Ni,Bi) solder ball and SAC305 paste) solder joints were prepared to compare solder joint reliability. To compare the solder joint reliability of homogeneous and heterogeneous solder joints, the shear strength of the solder joint was measured before and after thermal cycling tests. After the shear strength test, the area ratio of ductile-brittle fracture surfaces was also compared. The IMC thickness was measured and the crack propagation in the solder joint was analyzed before and after the thermal cycle test. © 2024 IEEE.

关键词： Thermal cycling

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Quantifying Objective and Perceived Image Quality Through Eeg and Eye-Tracking

SSRN

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SSrN 2024年

作者： Lim, Changhyun Jeon, Hyun-Jun Jung, Woojae Kwak, Youngshin Lee, Myong Young Ham, Jung Hyun Joo, Hyun Bin Kwon, Oh-Sang Chung, dongil Department of Biomedical Engineering Ulsan National Institute of Science and Technology Ulsan Korea Republic of TV Picture Quality Development Gr. TV R&D Center of LG Electronics Korea Republic of

Image quality evaluation of electronic displays is inherently subjective. To date, user studies in focus groups and viewers’ self-reports have been the primary sources of feedback used as judgment criteria for the display quality. However, little has been known whether the measured responses to visual stimuli, other than self-reports, reflect the objective and subjective levels of image quality on displays. Here, we used electroencephalogram (EEG) and eye-tracking to investigate whether individuals’ neural and physiological responses to visual stimuli track three objectively discerned levels of image quality, as well as their self-ratings on vividness. Our findings reveal that shared and dissociable sets of neurophysiological features successfully tracked both the objective and subjective perspectives of image quality. The current research underscores the effectiveness of EEG and eye-tracking as potential quantitative tools for assessing both the objective image quality disparities and the subjective affective nuances in users' visual display experiences. © 2024, The Authors. All rights reserved.

关键词： Eye tracking

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ZK60 based alloys with high-strength and high-ductility:A review

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resources Chemicals and materials 2023年第2期2卷 151-166页

作者： Qiang Yang Zefeng Xie Jun Li Shuhui Lv Wei Zhang ruizhi Wu Hucheng Pan rongguang Li Xin Qiu State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022PR China School of Materials Science and Engineering Changchun University of Science and Technology130022PR China Department of China FAW Co. Ltd.R&D Institute PrototypingChangchun 130011PR China Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001PR China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) College of Materials Science and EngineeringNortheastern UniversityShenyang 110819PR China School of Mechanical and Power Engineering Shenyang University of Chemical TechnologyShenyang 110142PR China

Wrought magnesium alloys with high-strength and high-ductility property have been attracting more and more interest in automotive and aerospace industries,and the conventional Mg-Zn based alloys are widely accepted as the representative *** of Mg-Zn based alloys with rare earth(rE)element additions and with modified preparation processes domains the evolution of their potential structural ***,their highest tensile yield strength(TYS)is still in the order of 400 MPa,clearly lower than that of the Mg-rE based alloys,in the order of 500 MPa,much less compared with the high-strength aluminum alloys and titanium *** to many previous investigations,two relatively efficient methods to improve mechanical properties of ZK based alloys were revealed as:alloying by rE and optimizing wrought ***,comprehensive combinative investigation was hitherto not conducted to ***,it is imperative in the next work to further improve the yield strength to the order of 500 MPa or much higher,and simultaneously modify the tension-compression strength asymmetry of the ZK series ***,developing novel wrought processes for ZK60(+rE)alloys or exploring appropriate pre-dealing treatments before or after the wrought processes might be an important approach to accomplish a much higher level of balance of high-strength and high-ductility.

关键词： Magnesium alloys High-strength and high-ductility

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Polyol grafted thin film nanocomposite membrane: Enhanced pervaporation performance for isopropanol dehydration

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Separation and Purification technology 2024年 328卷

作者： Chu, Min-Yi Ang, Micah Belle Marie Yap Millare, Jeremiah C. Yang, Hong-Li Huang, Shu-Hsien Tsai, Hui-An Lee, Kueir-rarn R&D Center for Membrane Technology and Department of Chemical Engineering Chung Yuan Christian University Taoyuan32023 Taiwan School of Chemical Biological and Materials Engineering and Sciences Mapúa University Manila1002 Philippines Department of Chemical and Materials Engineering National Ilan University Yilan26047 Taiwan

Isopropanol is used as a cleaning agents especially in the semiconductor industry. Thus, recycling, and purifying alcohol can reduce the overall cost of production. To improve the separation performance of the thin-film nanocomposite (TFN) membrane, nanozeolite (NZ) was embedded in polyamide layer followed by post-treatment of polyols. The polyamide layer was fabricated through interfacial polymerization of diethylenetriamine (dETA) and trimesoyl chloride (TMC). NZ was dispersed in TMC in order to be embedded on the separation layer. Afterwards, the membrane was simultaneously post-treated using polyols. different types of polyols were introduced: d-sorbitol (dST), erythritol (ErT), and pentaerythritol (PET). A higher number of hydroxyl groups can provide a denser separation layer. Their chemical structures also affects the reaction rate, where more linear structures (dST and ErT) had better reaction and crosslinking with acyl chloride. High reaction rate of dST gives the roughest surface and high crosslinking degree. Compared to other polyols, Using dST in post-treatment exhibited the highest separation performance. It had a permeation flux of 3,098 g·m−2·h−1 and 99.9 wt% water concentration in permeate (feed = 70 wt% aqueous isopropanol solution at 25℃). Therefore, post-treatment using polyols can further enhance the separation efficiency of TFN membranes with a stable performance over a long period of time. © 2023 Elsevier B.V.

关键词： Pervaporation

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Metal-organic framework integrated surface-engineered polyelectrolyte membranes enhancing tetrahydrofuran dehydration

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Journal of the Taiwan Institute of Chemical Engineers 2024年 162卷

作者： Huang, Yu-Han Huang, Shu-Hsien Gallardo, Marwin r. Millare, Jeremiah C. Li, Chi-Lan Lee, Kueir-rarn Department of Chemical and Materials Engineering National Ilan University Yilan26047 Taiwan R&D Center for Membrane Technology and Department of Chemical Engineering Chung Yuan Christian University Taoyuan32023 Taiwan School of Chemical Biological and Materials Engineering and Sciences Mapúa University Manila1002 Philippines

Background: Enhancing composite membrane performance is crucial for industrial separation processes. Integrating metal-organic frameworks (MOFs) into membranes offers a promising strategy. We introduce a novel approach by integrating HKUST-1 MOF within a polyelectrolyte matrix to improve membrane efficiency. Methods: A layer-by-layer self-assembly technique on a hydrolyzed polyacrylonitrile support integrates HKUST-1 into a polyelectrolyte matrix. Polyethyleneimine (PEI) and polyacrylic acid (PAA) form the polyelectrolyte layer through electrostatic interactions. The incorporation of HKUST-1 within the PEI matrix enhances separation efficiency, particularly in tetrahydrofuran dehydration, with optimal conditions using 100 ppm of HKUST-1 and forming 2 bilayers. Significant findings: Under optimal conditions, the resulting membrane exhibits exceptional performance. It demonstrates a permeation flux of 1442.30 g∙m−2∙h−1, a water concentration in the permeate of 98.0 wt%, and a separation factor of 440. The modified membrane also shows remarkable stability across varying temperatures (25–55 °C) and tetrahydrofuran concentrations in the feed (10–90 wt%) during long-term testing. These findings highlight the membrane's potential for enhancing separation processes in the chemical industry. © 2024

关键词： dehydration

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development of two-stage calibration technique for mems/fog inertial navigation system

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Journal of Institute of Control, robotics and Systems 2021年第6期27卷 450-458页

作者： Yu, Haesung Seo, Yeong-Bin Lee, Inseop Oh, Juhyun Yi, Hyeongsub Kim, Cheonjoong Lee, Sang Jeong The 3rd R&D Institute-3rd Directorate Agency for Defense Development Korea Republic of Weapon System Engineering University of Science and Technology Department of Electronics Engineering Chungnam National University Korea Republic of

This paper presents a two-stage calibration method for a MEMS/FOG inertial navigation system (INS). In general, low-grade MEMS accelerometers cannot realize indirect calibration due to the occurrence of large errors. The indirect calibration method calculates the inertial sensor error as a linear combination of the velocity errors by changing the posture according to the rotation sequence based on the rate table and by repeating the alignment and navigation processes. However, if the inertial sensor error is extremely large, a nonlinear velocity error is additionally generated, and thus, the inertial sensor error cannot be accurately calculated. In this study, we developed a two-level calibration method. In the first stage, the large error of the inertial sensor was calculated and compensated via a direct calibration method. In the second stage, indirect calibration was performed by repeating the alignment and navigation processes by using the accelerometer and gyro calibrated in the first stage. The performance of the inertial navigation system could be enhanced by applying an indirect calibration technique suitable to the operating environment. The experimental results demonstrated that the proposed method could reduce the navigation error. © ICrOS 2021.

关键词： Inertial navigation systems

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