Papers by doan son nguyen
AIP Conference Proceedings, 2006
AIP Conference Proceedings, 2006
Relationship between Critical Current Density and Self‐Field Losses of Ag‐Sheathed (Bi,Pb)SrCaCuO... more Relationship between Critical Current Density and Self‐Field Losses of Ag‐Sheathed (Bi,Pb)SrCaCuO Superconducting Tapes. [AIP Conference Proceedings 824, 696 (2006)]. Doan N. Nguyen, Pamidi VPSS Sastry, Guomin Zhang, David C. Knoll, Justin Schwartz. Abstract. ...
Advances in Experimental Medicine and Biology, 1994
1. Adv Exp Med Biol. 1994;350:211-7. Transcription of message for tumor necrosis factor-alpha by ... more 1. Adv Exp Med Biol. 1994;350:211-7. Transcription of message for tumor necrosis factor-alpha by lacrimal gland is regulated by corneal wounding. Thompson HW, Beuerman RW, Cook J, Underwood LW, Nguyen DH. Laboratory ...
Alternating current (AC) loss and current carrying capacity are two of the most crucial considera... more Alternating current (AC) loss and current carrying capacity are two of the most crucial considerations in large-scale power applications of high temperature superconducting (HTS) conductors. AC losses result in an increased thermal load for cooling machines, and thus increased operating costs. Furthermore, AC losses can stimulate quenching phenomena or at least decrease the stability margin for superconducting devices. Thus, understanding
Superconductor Science and Technology, 2013
Superconductor Science and Technology, 2009
Page 1. A new finite-element method simulation model for computing AC loss in roll assisted biaxi... more Page 1. A new finite-element method simulation model for computing AC loss in roll assisted biaxially textured substrate YBCO tapes This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2010 Supercond. Sci. Technol. 23 025001 ...
Superconductor Science and Technology, 2009
Page 1. AC loss study of antiparallel connected YBCO coated conductors This article has been down... more Page 1. AC loss study of antiparallel connected YBCO coated conductors This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2009 Supercond. Sci. Technol. 22 055014 (http://iopscience.iop.org/0953-2048/22/5/055014) ...
Superconductor Science and Technology, 2010
In a three-phase tri-axial cable, the magnetic interaction between the phases makes the loss meas... more In a three-phase tri-axial cable, the magnetic interaction between the phases makes the loss measurement by an electromagnetic method very complex. We developed the theoretical background showing that three-phase AC loss measurements by the electromagnetic method are, in principle, possible. We then implemented this theory in practical measurements on a 3 m long, tri-axial cable fabricated from RABiTS (rolling-assisted biaxially textured substrate) coated conductor. Initially, the proposed measurement technique was implemented in the simpler cases when the three cable phases are 180° out of phase, i.e. (0°, 180°, 360°) or (0°, 360°, 180°) rather than (0°, 120°, 240°) as in a traditional three-phase system. For these cases, the currents in the phases are either in phase (360° phase difference) or anti-phase (180° phase difference). These are essentially single-phase measurements with only one transport current used as the supply for all three phases. This simplification allowed us to use both the established and the proposed techniques to measure the total losses of the cable for these cases. An excellent agreement between the two measurement methods confirmed the validation of our proposed measurement technique. The proposed measurement method was then employed to measure the total AC losses in a cable when it operates in the true three-phase mode. We believe that these data represent the first electromagnetic three-phase AC loss measurements.
Superconductor Science and Technology, 2011
ABSTRACT In this paper, we investigate the effectiveness of alternative designs to reduce the AC ... more ABSTRACT In this paper, we investigate the effectiveness of alternative designs to reduce the AC losses of high temperature superconducting (HTS) power transmission cables. The idea behind these designs is to undermine the edge effect, which is one of the main factors contributing to AC losses in HTS power cables made of coated tapes. The edge effect, which arises from the presence of gaps between the tapes, results in large normal components of magnetic field near the edges of the tapes and in turns leads to a current distribution with higher density near the edges. To perform our investigation we use a numerical technique developed in our previous work which allows us to consider the helical configuration of the tapes. Through numerical simulations we assess the effectiveness of two overlapped designs, i.e. a cyclic overlapped design and an anticyclic overlapped design, in reduction of AC losses in single layer HTS power cables made of coated tapes. Simulation results show that AC losses can be reduced by about 70% as compared with a typical single layer cable.
Superconductor Science and Technology, 2006
... E-mail: [email protected] Received 30 June 2006 Published 29 August 2006 Online at stacks.i... more ... E-mail: [email protected] Received 30 June 2006 Published 29 August 2006 Online at stacks.iop.org/SUST/19/1010 ... 1011 Page 4. DN Nguyen et al Figure 2. Schematic views of a rectangular pick-up coil and a sample. ...
Journal of Applied Physics, 2005
The effect of phase difference between transport current and perpendicular applied magnetic field... more The effect of phase difference between transport current and perpendicular applied magnetic field, Δρ, on total ac loss in multifilamentary, silver-sheathed Bi,Pb2Sr2Ca2Cu3Ox ... The HTS tape used in these experiments was silver-sheathed, untwisted Bi-2223 tape made by ...
Journal of Applied Physics, 2009
Numerical analysis of ac loss in bifilar stacks and coils of ion beam assisted deposition YBCO co... more Numerical analysis of ac loss in bifilar stacks and coils of ion beam assisted deposition YBCO coated conductors. [Journal of Applied Physics 105, 063917 (2009)]. Doan N. Nguyen, Stephen P. Ashworth, Jeffrey O. Willis. Abstract. ...
Journal of Applied Physics, 2009
Experimental and finite-element method studies of the effects of ferromagnetic substrate on the t... more Experimental and finite-element method studies of the effects of ferromagnetic substrate on the total ac loss in a rolling-assisted biaxially textured substrate YBaCuO tape exposed to a parallel ac magnetic field. [Journal of Applied Physics 106, 093913 (2009)]. ...
IEEE Transactions on Appiled Superconductivity, 2005
Practical applications of HTS tapes cannot avoid various stresses and strains, including tension,... more Practical applications of HTS tapes cannot avoid various stresses and strains, including tension, bending and/or torsion. These loads directly affect the critical current and AC losses of HTS tapes. Thus the investigation of the effect of stress/strain on HTS tapes is important for practical applications. Here, the critical currents and AC losses are measured at 77 K for different Bi2223/Ag composite tapes under different room temperature stress/strain. The strain dependence of the critical currents and AC losses of Bi2223/Ag composite superconducting tapes are studied. A comparison is given for the measured results and the values calculated from the formulae developed from the Norris formula and critical current-strain relationship.
IEEE Transactions on Applied Superconductivity, 2007
IEEE Transactions on Applied Superconductivity, 2009
A versatile experimental facility was designed and set up to measure transport ac losses, magneti... more A versatile experimental facility was designed and set up to measure transport ac losses, magnetization ac losses, and total ac losses in high-temperature superconductors at variable temperatures. Several sets of measurements were carried out in the temperature range of 35 K to 100 K. Sample temperature during the measurements could be controlled within plusmn0.5 K of set temperature. Temperature dependence of transport losses reflects variation of critical current density of the tapes with temperature. Temperature dependence of magnetization losses exhibits an interesting behavior with a peak, whose position shifts to lower temperatures as the magnetic field is increased. Experimental data of ac losses at various temperatures are compared with those calculated using numerical methods. Generally, the simulated results reproduce well the experimental data.
IEEE Transactions on Applied Superconductivity, 2014
ABSTRACT
Arthritis & Rheumatism, 2011
This study was undertaken to generate and characterize human induced pluripotent stem cells (PSCs... more This study was undertaken to generate and characterize human induced pluripotent stem cells (PSCs) from patients with osteoarthritis (OA) and to examine whether these cells can be developed into disease-relevant cell types for use in disease modeling and drug discovery. Human synovial cells isolated from two 71-year-old women with advanced OA were characterized and reprogrammed into induced PSCs by ectopic expression of 4 transcription factors (Oct-4, SOX2, Klf4, and c-Myc). The pluripotency status of each induced PSC line was validated by comparison with human embryonic stem cells (ESCs). We found that OA patient-derived human synovial cells had human mesenchymal stem cell (MSC)-like characteristics, as indicated by the expression of specific markers, including CD14-, CD19-, CD34-, CD45-, CD44+, CD51+, CD90+, CD105+, and CD147+. Microarray analysis of human MSCs and human synovial cells further determined their unique and overlapping gene expression patterns. The pluripotency of established human induced PSCs was confirmed by their human ESC-like morphology, expression of pluripotency markers, gene expression profiles, epigenetic status, normal karyotype, and in vitro and in vivo differentiation potential. The potential of human induced PSCs to differentiate into distinct mesenchymal cell lineages, such as osteoblasts, adipocytes, and chondrocytes, was further confirmed by positive expression of markers for respective cell types and positive staining with alizarin red S (osteoblasts), oil red O (adipocytes), or Alcian blue (chondrocytes). Functional chondrocyte differentiation of induced PSCs in pellet culture and 3-dimensional polycaprolactone scaffold culture was assessed by chondrocyte self-assembly and histology. Our findings indicate that patient-derived synovial cells are an attractive source of MSCs as well as induced PSCs and have the potential to advance cartilage tissue engineering and cell-based models of cartilage defects.
This study presents measurements of AC losses in multi-filamentary Bi-2223/Ag tapes using a calor... more This study presents measurements of AC losses in multi-filamentary Bi-2223/Ag tapes using a calorimetric method. The AC losses are investigated at 77 K for different AC currents in the range of 5-60 Amps,and for different frequencies in the range of 50 Hz to 500 Hz. The results are compared with theoretical Norris model [1] of calculating self-field loss in high
We present a decadal-resolution stalagmite δ18O inferred Asian summer monsoon (ASM) record from 2... more We present a decadal-resolution stalagmite δ18O inferred Asian summer monsoon (ASM) record from 27.8-30.0 ka, using 230Th dates with precision as good as ±82 yrs, in Son La Province, northwestern Vietnam. During this time window, the onset of a strong ASM at 30.05 ± 0.08 ka and its duration of 1.45 kyrs match those in Hulu δ18O records with 100-150-yr resolution. The coincidence of stalagmite δ18O records from 21-32°N indicates the ASM prevailed over the whole East Asia realm. It was generally consistent with the Greenland Interstadial Event 4 (GIS 4); however, three discrepancies are exhibited between the millennial-scale Asian stalagmite and Greenland events. (1) The onset of the ASM led that of GIS 4 1.1 ± 0.9 kyrs (2σ). (2) The duration of 1.45 kyrs for the ASM is longer than that of 0.5-0.6 kyrs for GIS 4. (3) The prevailing plateau-type ASM episode is in contrast to the temperature decline in the Greenland. The different characteristics of ASM and GIS 4 could be related to the discontinuity of Heinrich Event 3, thermal evolution in the southern hemisphere, and/or low-latitudinal climatic variability.
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Papers by doan son nguyen