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Microstructural Development of Brass Alloys with Various Bi and Pb Additions
Chih-Chun Hsieh,Jia-Siang Wang,Paxon Ti-Yuan Wu,Weite Wu 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.6
In the study, using the gravity casting method, adding 1.52%Pb, 0.5%Bi, 1%Bi and 1.5%Bi into the brass (Cu- 40%Zn) alloy. The microstructural changes from the Widmanstätten into the networked structures when Pb was added to 1.5%. The microstructure was an acicular Widmanstätten when Bi contents were 0.5% and 1% and it was a plate Widmanstätten when Bi contents were 1.5%. There were four kinds of precipitation morphologies of Bi particles. The precipitation morphologies of Bi particles can be divided into a globular (<1 μm), a disc (=1 μm), discontinuous massive (>1 μm), and continuous block structures (about 20~30 μm). The Pb particles were embedded in the networked α phase and the Bi particles precipitated at the α/α and the α/β’ grain boundaries. The XRD analysis showed the high proportion of β’ phase with 0.5% Bi-brass and 1% Bi-brass and indicated a lower one with Pb-brass and 1.5% Bi-brass.
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Dynamic Modeling and Control of a Padder Roller System
Kuo, Chung-Feng Jeffrey,Chen, Jia-Siang The Korean Fiber Society 2007 Fibers and polymers Vol.8 No.5
This is the first time in the literature dealing with the dynamic modeling and control of a rotating padder roller system. It is intended to design a control system with effective scheme and robustness to stabilize all vibration modes of a rotating padder roller system by using one set of sensor and actuator. The controller design depends on the specific pole-zero patterns. In practice, the pole-zero patterns remain the same, no matter how the physical system parameters are different. By properly placing the actuator and sensor, a realizable controller and sensor is designed to stabilize all the vibration modes and make the closed loop system absolutely stable. This will suppress the vibration without suffering from spillover and can eliminate an infinite number of vibration modes. The performance of this controller has been successfully implemented by computer simulation.
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Chih-Chun Hsieh,Yi-Chia Liu,Jia-Siang Wang,Weite Wu 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.4
The aim of this study is to discuss the effect of microstructural development with different Ti contents inFe-based hardfacing alloys. A series of Fe-Cr-C-Si-Mn-xTi alloy fillers was deposited on SS400 low carbonsteel substrate using oscillating gas tungsten arc welding. The microstructure in the Fe-based hardfacing alloywithout Ti content addition included: the primary γ, eutectic γ+(Fe,Cr)3C, eutectic γ+(Fe,Cr)2C and martensite. With increasing Ti contents, the microstructures showed the primary TiC carbide, γ phase and eutectic+(Fe,Cr,Ti)3C. The amount and size of TiC carbide in the hardfacing layers increased as the Ti contentincreased. However, the eutectic γ+(Fe,Cr,Ti)3C content decreased as the Ti content increased. Accordingto the results of the hardness test, the lowest hardness value (HRC 54.93) was found with 0% wt% Ti andthe highest hardness (HRC 60.29) was observed with 4.87 wt% Ti.
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Ting An Lin,Yu-Chun Chuang,Jan-Yi Lin,Mei-Chen Lin,Ching-Wen Lou,Keng Siang Sim,Jia-Horng Lin 한국섬유공학회 2020 Fibers and polymers Vol.21 No.10
People have increasingly rising health consciousness in recent years and researchers are thus devoted themselvesto develop multi-functional textile products. In this study, stainless steel (SS) filaments are used for electromagnetic shieldingeffectiveness (EMSE) while polypropylene (PP) filaments are used for ultraviolet resistance and good mechanical properties. Spinning and weaving continuous formation techniques are employed to produce wrapped yarns with SS and PP filaments,after which a weaving process is employed for the preparation of SS/PP woven fabrics. The woven fabrics are tested forEMSE and UV resistance, examining the effect of the lamination-layer numbers and lamination-layer angles. Test resultsshow that the optimal EMSE and UV resistance occur when SS/PP woven fabrics are laminated with two layers at 90 °. Notonly focus on the mechanical performance, the proposed woven fabrics with good EMSE, UV resistance, and a light weight,and are good candidate for a variety of application as required. The proposed UV resistance and EMSE woven fabricssignificantly increase the additional values of traditional textiles.
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Swati Vijayan,Quan Yao Ho,Choong Hou Koh,Ian Tatt Liew,Sobhana Thangaraju,Ningyan Wong,Yann Shan Keh,Zi Hui Sharel Ong,Jia Qin Tan,Khung Keong Yeo,Terrance Siang Jin Chua,Terence Kee 대한이식학회 2022 Korean Journal of Transplantation Vol.36 No.3
Background: Cardiac evaluation before deceased donor kidney transplant (DDKT) remains a matter of debate. Data on Asian countries and countries with prolonged waiting times are lacking. This study aimed to assess the outcomes of patients referred for DDKT after a cardiac evaluation at an Asian tertiary transplant center. Methods: This single-center retrospective review analyzed patients who were referred for waitlist placement and underwent cardiac stress testing between January 2009 and December 2015. Patients with cardiac symptoms were excluded. The primary outcome was three-point major adverse cardiovascular events (MACE), a composite of non-fatal myocardial infarction, non-fatal stroke, and cardiovascular death. Results: Of 468 patients referred for DDKT, 198 who underwent cardiac stress testing (myocardial perfusion studies in 159 patients and stress echocardiography in 39 patients) were analyzed. MACE occurred in 20.7% of the patients over a median follow-up of 4.6 years. Cardiac stress tests were positive for ischemia in 19.7% of the patients. Coronary angiography was performed in 63 patients, including 29 patients with diabetic kidney disease and negative cardiac stress tests. Significant coronary artery disease (CAD) was detected in 27 patients (42.8%), of whom 18 underwent revascularization. MACE was associated with significant CAD on coronary angiography in the multivariable analysis. Cardiac stress test results were not associated with MACE. Amongst diabetic patients who had negative cardiac stress tests, 37.9% had significant CAD on coronary angiography. Conclusions: The cardiovascular disease burden is significant amongst DDKT waitlist candidates. Pretransplant cardiac screening may identify patients with significant CAD at higher risk of MACE.
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