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Ching-Ming Lee,Lin-Xiu Ye,Jia-Mou Lee,Yu-Cyun Lin,Chao-Yuan Huang,J. C. Wu,Masakiyo Tsunoda,Migaku Takahashi,Te-ho Wu 한국자기학회 2011 Journal of Magnetics Vol.16 No.2
This study reports an alternative method for measuring the magnetoresistance of unpatterned magnetic tunnel junctions similar to the current-in-plane tunneling (CIPT) method. Instead of using microprobes, a series of point contacts with different spacings are coated on the top surface of the junctions and R-H loops at various spacings are then measured by the usual four-point probe method. The values of magnetoresistance and resistance-area products can be obtained by fitting the measured data to the CIPT theoretical model. The test results of two types of junctions were highly similar to those obtained from standard CIPT tools. The proposed method may help to accelerate the process for evaluating the quality of magnetic tunnel junctions when commercial CIPT tools are not accessible.
Liwei Wu,Jingyan Ban,Qian Jiang,Ting-Ting Li,Bing-Chiuan Shiu,Shih-Yu Huang,Ching-Wen Lou,Jia-Horng Lin 한국섬유공학회 2019 Fibers and polymers Vol.20 No.6
Polyethylene terephthalate (PET) nonwoven fabrics, carbon fabrics (CF), and flexible polyurethane (PU) foamsare made into novel sandwich composites using one-step molding. The flame retradance and mechanical properties of thesandwich composites are evaluated, examining the influences of the content of flame retardant agent (20, 30, 40, and 50 wt%)and areal density of PET panels (200, 300, and 400 g/m2). The test results show that the PET/CF/PU sandwich composites arerated flame retardant as V0 and do not generate melts. The failure mode of PET/CF/PU sandwich composites converts fromoverall fracture to layered fracture as a result of increasing the flame retardant agent. The tensile strength at break of PET/CF/PU sandwich composites with corresponding PET panels is 650 N for 200 g/m2, 928 N for 300 g/m2, and 1744 N for 400 g/m2,which are 42.63 %, 60.48 %, and 77.85 % greater than those of the PET/PU sandwich composites. Moreover, the burstingstrength of PET/CF/PU sandwich composites with corresponding PET panels is 3322 N for 200 g/m2, 3869 N for 300 g/m2,and 4978 N for 400 g/m2, which are 195 %, 180 %, and 143 % greater than those of the PET/PU sandwich composites.
Ting-Ting Li,Wenna Dai,Liwei Wu,Hao-Kai Peng,Xiayun Zhang,Bing-Chiuan Shiu,Jia-Horng Lin,Ching-Wen Lou 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2
In order to deeply explore the fiber characteristics influencing on stab resistance of shear thickening fluid (STF)-impregnated fabrics, two different weaving fabrics, ultra-high molecular weight polyethylene (UHMWPE) fabric and Kevlar fabrics are saturate the various concentrations and particle size of STFs. Result shows that, SiO2/PEG-200 blends demonstrate quick shear-thickening property, and the critical shear rate lowers to 1.2-45 s-1 with higher concentration of 75 nm SiO2. STF concentration and particle size significantly affect spike puncture resistance property, but the knife stab resistance mainly depends on fiber characteristics. Comparatively, STF-UHMWPE composite fabrics exhibit better knife stab resistance but weaker spike puncture resistance than STF-Kevlar fabrics. This study can provide an optimization for structure design of stab resistance armors in the future.
Yi‑Chia Kuan,Venkatesan Thiruvengadam,Jia‑Shin Lin,Jia‑Hsin Liu,Tsan‑Jan Chen,Hsin‑Mao Wu,Wen‑Ching Wang,Liang‑Jwu Chen 한국식물생명공학회 2018 Plant biotechnology reports Vol.12 No.1
The broad-specificity amino acid racemase (Bsar) from Pseudomonas putida catalyzes the racemization of various amino acids, offering a flexible and feasible platform to develop a new non-antibiotic selectable marker system for plant transformation. In the present study, we demonstrated that a Bsar variant, Bsar-R174K, that is useful as a selectable marker gene in Arabidopsis and rice that were susceptible to l-lysine and D-alanine. The introduction of wild-type Bsar, Bsar-R174K or Bsar-R174A into E. coli lysine or asparagine auxotrophs was able to rescue the growth of these microorganisms in minimal media supplemented with selectable amino acid enantiomers. The transformation of Arabidopsis with Bsar or Bsar variants based on d-alanine selection revealed that Bsar-R174K had the greatest efficiency (2.40%), superior to kanamycin selectionbased transformation (1.10%). Whereas, l-lysine-based selection exhibited lower efficiency for Bsar-R174K (0.17%). The progenies of selected Bsar-R174K transgenic Arabidopsis revealed normal growth properties. In addition, Bsar-R174K transgenic rice was obtained on l-lysine medium with an efficiency of 0.9%, and the progenies of the transgenic rice revealed morphologically normal phenotypes comparable with their wild-type counterparts. This study presents the first report of broad range amino acid racemase Bsar-R174K as a non-antibiotic selectable marker system applied in transgenic plants.
An Improved Symmetrically-Graded Doped-Channel Heterostructure Field-Effect Transistor
Ke-Hua Su,Wei-Chou Hsu,Chang-Luen Wu,Ching-Sung Lee,Po-Jung Hu,Yeong-Jia Chen,Yu-Shyan Lin 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.6
A new heterostructure field-effect transistor with an InGaAs symmetrically-graded doped-channel (SGDC) structure has been successfully investigated. The channel design demonstrated a reduced Coulomb scattering phenomenon by confining the conduction electrons away from the channel/spacer interface. Consequently, a higher current density, a higher breakdown voltage, a wider gate-voltage swing, a higher transconductance, a higher threshold voltage, and improved microwave and power characteristics were achieved by using the SGDC structure, as compared to those of conventional doped-channel devices. Besides, the AlGaAs/GaAs superlattice buffer structure was used to improve the high-temperature threshold-voltage characteristics.
Ting-Ting Li,Fei Sun,Xing Liu,Hua-Ling Wu,Ching-Wen Lou,Jia-Horng Lin 한국섬유공학회 2018 Fibers and polymers Vol.19 No.6
High-modulus PET filaments and thermal bonding are used to reinforce the puncture resistance stability of the insole composite. This study aims to discuss the influences of the amount of low-melting-point polyester fibers (LMPET) and needle densities (ND) on tensile, bursting, and quasi-static puncture resistance properties. Besides, significance of LMPET amount and ND on puncture resistance against flat-head (A), spherical-head (B), and pointed-head (C) probes are in particular investigated to simulate the diversified application environments for insoles. Research result shows that, LMPET amount significantly affects the static puncture resistance against three probes; ND only significantly influences the puncture resistance against Probe A and C. Thermal bonding significantly improves the puncture strength against Probe B with various LMPET amounts of insoles, but evidently increases the puncture resistance against Probe A and C when being punched at various ND. The amount of LMPET fibers has a positive influence on the puncture strength of insoles, and 70 wt% of LMPET provide the average static puncture resistance up to 342.6 N. The high-modulus resultant insoles have advantages of flexibility, ease of process, and bendability with a higher and more stabilized puncture resistances.
Min-Hsiung Pan,Katarzyna Maresz,Pei-Sheng Lee,Jia-Ching Wu,Chi-Tang Ho,Janusz Popko,Dilip S. Mehta,Sidney J. Stohs,Vladimir Badmaev 한국식품영양과학회 2016 Journal of medicinal food Vol.19 No.7
Circulatory markers of low-grade inflammation such as tumor necrosis factor-alpha (TNF-α), interleukin-1 alpha (IL-1α), and interleukin-1 beta (IL-1β) positively correlate with endothelial damage, atheroma formation, cardiovascular disease, and aging. The natural vitamin K2-menaquinone-7 (MK-7) added to the cell culture of human monocyte-derived macrophages (hMDMs) at the same time as toll-like receptor (TLR) agonists did not influence the production of TNF-α. When the cells were pretreated up to 6 h with MK-7 before treatment with TLR agonists, MK-7 did not inhibit significantly the production of TNF-α after the TLR activation. However, 30 h pretreatment of hMDMs with at least 10 μM of MK-7 effectively and dose dependently inhibited the proinflammatory function of hMDMs. Pretreatment of hMDMs with 10 μM of MK-7 for 30 h resulted in 20% inhibition of TNF-α production after lipopolysaccharide (LPS) activation (P < .05) and 43% inhibition after macrophage-activating lipopeptide (MALP) activation (P < .001). Pathogen-associated molecular pattern (PMPP) activation was inhibited by 20% with MK-7 pretreatment; however, this inhibition was not statistically significant. The 30 h pretreatment of a THP-1-differentiated monocyte cell line with MK-7 resulted in a dose-dependent downregulation of TNFα, IL-1α, and IL-1β gene expression as evaluated by RNA semiquantitative reverse transcription polymerase chain reaction (RT-PCR). MK-7 is able to modulate immune and inflammatory reactions in the dose–response inhibition of TNF-α, IL-1α, and IL-1β gene expression and protein production by the healthy hMDMs in vitro.