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MBE Growth and Transport Properties of MnGeP2 under Various P Pressure
최정용,황영훈,김재희,조성래,C-C. Tsai 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.6
We have studied the magneto-transport properties of ferromagnetic MnGeP2 semiconductor thin films deposited on GaAs(100) by using molecular beam epitaxy (MBE) under diverse beam equivalent pressures (BEP) of phosphorus. The growth direction was along the c-axis of the film, whose surface was very rough. The temperature-dependent electrical resistance results strongly support the presence of a ferromagnetic phase transition in the chalcopyrite MnGeP2 thin film around 320 K. On the other hand, it shows an anisotropic magneto-resistance and an anomalous Hall effect in p-type MnGeP2 thin films, indicating the presence of spin-polarized hole carriers in MnGeP2. We have successfully observed magnetic domains at room temperature by using magnetic force microscopy (MFM). We have studied the magneto-transport properties of ferromagnetic MnGeP2 semiconductor thin films deposited on GaAs(100) by using molecular beam epitaxy (MBE) under diverse beam equivalent pressures (BEP) of phosphorus. The growth direction was along the c-axis of the film, whose surface was very rough. The temperature-dependent electrical resistance results strongly support the presence of a ferromagnetic phase transition in the chalcopyrite MnGeP2 thin film around 320 K. On the other hand, it shows an anisotropic magneto-resistance and an anomalous Hall effect in p-type MnGeP2 thin films, indicating the presence of spin-polarized hole carriers in MnGeP2. We have successfully observed magnetic domains at room temperature by using magnetic force microscopy (MFM).
Ferrimagnetism in strained Fe2As thin films on Si(001)
Hwang, Younghun,Choi, Jeongyong,Cho, Sunglae,Ketterson, John B.,Tsai, C.-C. American Institute of Physics 2009 JOURNAL OF APPLIED PHYSICS - Vol.105 No.7
<P>We present the structural and magnetic properties of Fe2As thin films grown on Si(100) by molecular beam epitaxy. From the reflection high-energy electron diffraction and x- ray diffraction patterns, the orientation of Fe2As film on Si(100) was found to be a c-axis in the tetragonal crystal structure. The tetragonal Fe2As thin film exhibited ferrimagnetic (FIM) ordering at room temperature. The magnetic moment of Fe2As was 0.1 mu(B)/unit cell determined from the saturated magnetic moment. The observed FIM in Fe2As films was attributed to the strain in the film. (c) 2009 American Institute of Physics. [DOI: 10.1063/1.3068626]</P>
Bone Drilling System for Quantifying Hand Feeling in Orthopedic Surgery
( C. -y. Wu ),( J. -y. Su ),( C. -s. Hsu ),( Y. -h. Chen ),( K. -f. Chang ),( C. -c. Huang ),( H. -m. Wu ),( Y. -c. Tsai ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
In this work, a bone drilling system was designed to quantify “hand feeling”, which can benefit surgeons to be more acquainted with bone hardness. A bi-axial force/torque sensor is mounted on the bone drilling system in order to measure the thrust force and the torque caused by drilling in bones. The system is assembled with a motorized stage, which is directly integrated with a surgical handpiece by an adjustable holder, to drill into various bones (porcine mandible, porcine femur, porcine rib) at different feed speeds and spindle speeds. The results reveal that the feed speed is positively corresponded with force and torque. However, the effect of spindle speed on force and torque is negligible. In addition, drilling bones without spraying water can cause the drilling temperature to increase to 73.3°C. According to the data from the experiments, the exact force and torque during bone drilling can be predicted with the given parameters. Thus, surgeons are capable of preventing the use of excessive force during bone drilling.
Tsai, C.F.,Lin, L.J.,Wang, C.H.,Tsai, C.S.,Chang, S.C.,Lee, T.T. Asian Australasian Association of Animal Productio 2022 Animal Bioscience Vol.35 No.12
Objective: A series of experiment were conducted to evaluate the effects of replacing a part of soybean meal (SBM) at 6% of broiler diets with fermented soybean meal (FSBM) obtained by single or two-stage fermentation by measuring growth performance, antioxidant activity in the jejunum and distal intestinal microflora. Methods: Soybean meal samples were prepared by single-stage fermentation using Bacillus velezensis (Bv) (FSBM<sub>B</sub>), or Lactobacillus spp. (as commercial control) (FSBM<sub>L</sub>). Additional SBM sample was prepared by two-stage fermentation using Bv and subsequently using Lactobacillus brevis ATCC 367 (Lb) (FSBM<sub>B+L</sub>). Enzyme activity, chemical composition, trichloroethanoic acid-nitrogen solubility index (TCA-NSI) and antioxidant activity were measured. Then, in an in vivo study, 320 Ross308 broilers were divided into four groups with ad libitum supply of feed and water. Four groups were fed either a corn-soybean meal diet (SBM), or one of fermented SBM diets (FSBM<sub>B+L</sub>, FSBM<sub>B</sub>, and FSBM<sub>L</sub>). Growth, serum characteristics, microflora, and the mRNA expression of selected genes were measured. Results: Compared to SBM, FSBM<sub>B+L</sub> contained lower galacto-oligosaccharide, allergic protein, and trypsin inhibitor, and higher TCA-NSI by about three times (p<0.05). Reducing power and 1,1-diphenyl-2-picrylhydrazyl free radical scavenging ability correlated positively with the TCA-NSI content in FSBM. Growth performances were not significantly different among four groups. In jejunum of 35-day-old broilers, partial replacement of SBM by FSBM<sub>B+L</sub> increased the activity of superoxide dismutase and catalase (CAT), and the FSBM<sub>B</sub> group had the highest catalase activity (p<0.05). Partial replacement of SBM by FSBM increased relative mRNA expressions of nuclear factor erythroid 2-related factor 2 (Nrf2), heme oxygenase-1 (HO-1), and peptide transporter 1 (PepT1) (p<0.05); however, FSBM<sub>B+L</sub> increased CAT mRNA level to 5 times of the control (p<0.05). Conclusion: Using Bv- and Lb-processed SBM through two-stage fermentation to partially replace 6% of diets will improve the gut's antioxidant activity under commercial breeding in broilers.
Super-Eddington Accretion in the <i>WISE</i>-selected Extremely Luminous Infrared Galaxy W2246−0526
Tsai, Chao-Wei,Eisenhardt, Peter R. M.,Jun, Hyunsung D.,Wu, Jingwen,Assef, Roberto J.,Blain, Andrew W.,Dí,az-Santos, Tanio,Jones, Suzy F.,Stern, Daniel,Wright, Edward L.,Yeh, Sherry C. C. American Astronomical Society 2018 The Astrophysical journal Vol.868 No.1
C.S. Tsai,Yung-Chang Lin,Wen-Shin Chen,Tsu-Cheng Chiang,Bo-Jen Chen 국제구조공학회 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.35 No.2
Recently, earthquake proof technology has been widely applied to both new and existing structures and bridges. The analysis of bridge systems equipped with structural control devices, which possess large degrees of freedom and nonlinear characteristics, is a result in time-consuming task. Therefore, a piecewise exact solution is proposed in this study to simplify the seismic mitigation analysis process for bridge systems equipped with sliding-type isolators. In this study, the simplified system having two degrees of freedom, to reasonably represent the large number of degrees of freedom of a bridge, and is modeled to obtain a piecewise exact solution for system responses during earthquakes. Simultaneously, we used the nonlinear finite element computer program to analyze he bridge responses and verify the accuracy of the proposed piecewise exact solution for bridge systems equipped with sliding-type isolators. The conclusions derived by comparing the results obtained from the piecewise exact solution and nonlinear finite element analysis reveal that the proposed solution not only simplifies the calculation process but also provides highly accurate seismic responses of isolated bridges under earthquakes.
Using Frequency Domain Reflectometry for Rapidly Measurement of Peanut Moisture Content
( C. J. Hsu ),( C. C. Hsu ),( H. K. Lee ),( T. M. Chen ),( P. K. Lei ),( Y. C. Tsai ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
In order to achieve rapidly measurement of peanut moisture content, the Frequency Domain Reflectometry (FDR) system was designed and develop by combining a dual-probe frequency domain reflectometer and Latte Panda. For the peanut moisture content FDR measurement, the calibration curve is necessary to define at first. The peanut samples (Tainan No.9 and Tainan No.18) are separate into pods and kernels and pulverized into granule shape for the measurement. The samples are baked in the oven at 130°C for 6 hours for removing the water content and defined it as 0% moisture content. Then the different weights of water have been added into samples for making different moisture content peanuts. The different dielectric constant measured by FDR sensor system is corresponded as the different moisture content. The calibration curve can be obtained from the relationship between the different moisture content peanut samples and the corresponding dielectric constant. During the FDR measurement, 32 N/㎡ applying force to the sample is necessary for eliminating the air gap. Furthermore, different methods for measuring the peanut moisture content were carried out in the factory with the drying machine. The comparison and results of different measure methods during the drying process at factory has been completed. The result shows that different measuring method have the same peanut moisture content trend. In addition, another method for obtaining the calibration curve was carried out in this work. The peanuts were baked to different moisture content and measured the corresponding dielectric constant. The calibration curves of peanut’s pods and kernels and the accuracy test has been defined. The both correlation coefficients of the testing samples are more than 0.97. It proves that this proposal FDR system have high accuracy and is enable to rapidly measure from 5% to 60% moisture content of peanut.
Tsai, C.S.,Lin, Yung-Chang Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.40 No.2
In order to upgrade the seismic resistibility of structures and enhance the functionality of an isolator, a new base isolator called the multiple trench friction pendulum system (MTFPS) is proposed in this study. The proposed MTFPS isolator is composed of a trench concave surface and several intermediate sliding plates in two orthogonal directions. Mathematical formulations have been derived to examine the characteristics of the proposed MTFPS isolator possessing numerous intermediate sliding plates. By means of mathematical formulations which have been validated by experimental results of bidirectional ground shaking, it can be inferred that the natural period and damping effect of the MTFPS isolator with several intermediate sliding plates can be altered continually and controllably during earthquakes. Furthermore, results obtained from the component and shaking table tests demonstrate that the proposed isolator provides good protection to structures for prevention of damage from strong earthquakes.