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排序方式: 共有362条查询结果,搜索用时 15 毫秒
31.
T. Petrisor Jr. R. B. Mos M. Nasui M. S. Gabor A. Augieri G. Celentano D. De Felicis E. Bemporad L. Ciontea T. Petrisor 《Journal of Superconductivity and Novel Magnetism》2014,27(11):2493-2500
In the present paper, we analyze the role of in situ grown BaZrO3 (BZO) inclusions in YBa2Cu3O7?x (YBCO) thin films prepared by chemical solution deposition using a low fluorine coating solution, on the field angle dependence of the critical current density, J c (??), data using the vortex path model. In order to form a coherent picture on the BZO doping influence on the pinning properties of the YBCO matrix, detailed structural analyses performed by X-ray diffraction techniques and microstructural evaluation by transmission electron microscopy are also presented. The evaluation of different contributions to the overall, J c , permitted us to prove the effectiveness of the BZO inclusions acting as isotropic pinning centers, reflected in a uniform component of high relative value with respect to other components. For the studied 10 mol % BZO doping concentration, a threefold increase in the critical current density, J c , of the YBCO host is measured, in self-field at 77 K, corresponding to a value of J c =2.9MA/cm2, whereas a factor 10 is measured at 1 T (J c =0.35 MA/cm2). 相似文献
32.
Hirokazu Yoshizawa Gabor C. Temes 《IEEE transactions on circuits and systems. I, Regular papers》2007,54(1):193-199
This paper describes high-precision switched-capacitor (SC) track-and-hold amplifier (THA) stages. They use a novel continuous-time correlated double sampling (CDS) scheme to desensitize the operation to amplifier imperfections. Unlike earlier predictive-CDS amplifiers, the circuits do not need a sampled-and-held input signal for their operation. During the tracking period, an auxiliary continuous-time signal path is established, which predicts the output voltage during the holding period. This allows accurate operation even for low amplifier gains and large offsets over a wide input frequency range. Extensive simulations were performed to compare the performance of the proposed THAs with earlier circuits utilizing CDS. The results verify that their operation is far more robust than that of any previously described SC amplifiers 相似文献
33.
Oxide layers were grown on tubular samples of Zr–1%Nb under conditions simulating those in VVER-type pressurised water reactors, viz. in near-neutral borate solutions in an autoclave at 290 °C. These samples were investigated using electrochemical impedance spectroscopy which was found to be suitable to follow in situ the corrosion process. A –CPEoxRox– element was used to characterise the oxide layer on Zr–1%Nb. Both the CPEox coefficient, σox, and the parallel resistance, Rox, were found to be thickness dependent. The layer thickness, however, can only be calculated after a calibration procedure. The temperature dependence of the CPEox element was also found to be anomalous while the temperature dependence of Rox indicates that the oxide layer has semiconductor properties. The relaxation time – defined as (Roxσox)1/ – was found to be quasi-independent of oxidation time and temperature; thus it is characteristic to the oxide layer on Zr–1%Nb. 相似文献
34.
35.
Gabor Karsai Kristinn Andersen George E. Cook R. Joel Barnett 《Journal of Intelligent Manufacturing》1992,3(4):229-235
While welding processes are of great importance in manufacturing, their modeling and control is still subject of research. The highly nonlinear, strongly coupled, and multivariable nature of these processes renders the use of analytical tools practically impossible. In this article a novel approach is presented which employs networks of simple nonlinear units: a neural network. A widely used welding process, the Gas Tungsten Arc Welding is presented and the problem of its modeling and control is exhibited. A very brief introduction to neural networks is followed by presenting the experimental results for modeling the static and dynamic behavior of the process, as well as some practical recommendations regarding the use of the neural network techniques for controlling these processes. 相似文献
36.
J. K. Holt D. G. Goodwin A. M. Gabor F. Jiang M. Stavola Harry A. Atwater 《Thin solid films》2003,430(1-2):37-40
The stoichiometry and hydrogen content of hot-wire (HW)-grown silicon nitride was examined as a function of SiH4/NH3 flow ratio. The effect of post-deposition hydrogenation treatment on overall film hydrogen content was determined. The hydrogen release properties in Si-rich and N-rich nitride layers were characterized by annealing treatments. Defect hydrogenation was studied using Fourier transform infrared spectroscopy on platinum-diffused silicon substrates. HW nitride layers were deposited onto diffused emitter String Ribbon silicon substrates, producing cells with comparable short circuit current density, open circuit voltage, fill-factor, and efficiency to those fabricated using plasma chemical vapor deposition nitride layers. 相似文献
37.
38.
Scobey Robert P. Howard Dwight L. Gabor Andrew J. 《IEEE transactions on bio-medical engineering》1981,(4):358-359
There are several specialized applications which require amplifiers with very low input capacitance. Two field effect transistors (FET's) can be cascaded in a source follower configuration to drive the drain of the input FET. The cascaded source follower provides at least an order of magnitude decrease in input capacitance. The cascaded source follower can be added to existing amplifiers or incorporated into new amplifier design with relatively little difficulty. 相似文献
39.
40.
Design of a novel MRI compatible manipulator for image guided prostate interventions 总被引:7,自引:0,他引:7
Krieger A Susil RC Ménard C Coleman JA Fichtinger G Atalar E Whitcomb LL 《IEEE transactions on bio-medical engineering》2005,52(2):306-313
This paper reports a novel remotely actuated manipulator for access to prostate tissue under magnetic resonance imaging guidance (APT-MRI) device, designed for use in a standard high-field MRI scanner. The device provides three-dimensional MRI guided needle placement with millimeter accuracy under physician control. Procedures enabled by this device include MRI guided needle biopsy, fiducial marker placements, and therapy delivery. Its compact size allows for use in both standard cylindrical and open configuration MRI scanners. Preliminary in vivo canine experiments and first clinical trials are reported. 相似文献