2,625 Result(s)

Article

Microwave properties of highly oriented YBa₂Cu₃O₇-δ superconducting thin films

We have performed millimeter-wave frequency (94 GHz) measurements on high-quality YBa₂Cu₃O₇-δ superconducting films on yttrium-stabilized (100) ZrO₂ and MgO substrates. The ∼0.2μm thin films fabricated by magnetr...

Bao Jia-shan, Zhou Shi-**, Wu Ke-qing, Lou Wei-gen… in Journal of Superconductivity (1991)

Article

Study on structure-property relationship of polyimide blends

Three pairs of polyimide/polyimide blends (50/50 wt%) with different molecular structures were prepared by two ways, i.e. mixing of the polyamic acid precursors with subsequent imidization, and direct solution...

Zhenhua Sun, Haiying Li, Yugang Zhuang, Mengxian Ding, Zhiliu Feng in Polymer Bulletin (1991)

Article

Metastable Phase Formation in the Y-TI System by Ion Mixing

Amorphization behavior was studied for the Y-Ti system, which has rather positive heat of formation being around + 22 kJ/mol, by room temperature 360 keV xenon ion mixing of Y_xTi_100-xmultilayered films to various...

S. L. Lai, Z. J. Zhang, J. R. Ding, B. X. Liu in MRS Online Proceedings Library (1991)

Article

Al-Yb Amorphous Alloys Produced by Ion Mixing or Solid State Reaction

We report, in this paper, three different ways of producing amorphous alloys in the Al-Yb system, (i) Al₈₀Yb₂₀multilayered films were readily amorphized by 180 keV xenon ion mixing at room temperature(RT) to a do...

B. X. Liu, J. R. Ding, D. Z. Che, H. B. Zhang in MRS Online Proceedings Library (1991)

Article

Defect States in Hydrogenated Amorphous Silicon-Sulphur Alloys by ESR and PAS

We have presented ESR and PAS measurements for a series of a-SiS:H and a-Si: H films deposited by glow discharge at different parameters. The spin density in a-SiS:H alloys measured by ESR is essentially indep...

Gaorong Han, Jianmin Oiao, Piyi Du, Zhonghua Jiang… in MRS Online Proceedings Library (1991)

Article

Irradiation Effect of Slow Neutrons on Mechanical Behaviour Related to Flux Pinning In YBa₂Cu₃O_y

Internal friction and modulus in YBa₂Cu₃O_y, which are related to flux pinning, were examined by means of the vibrating reed technique before and after the slow neutron irradiation to different fluences. Both the ...

J. S. Zhu, J. Li, Y. N. Wang, J. R. **, M. Gu… in MRS Online Proceedings Library (1991)

Article

Sol-Gel and RF Sputtering Thin Film Coatings for Fiber Optic Sensor Applications

Thin film coating techniques appear to have many advantages over other techniques for immobilization and incorporation of chemical indicators to optical waveguides in develo** dye based fiber optic chemical ...

M. R. Shahriari, J. Y. Ding, C. M. Wang, C. H. Lin… in MRS Online Proceedings Library (1991)

Article

Characterization of A-Si: H and A-SiGe: H Films in Liquid Crystal Light Valve

A-Si: H and a-Si: H/a-SiGe: H heterojunctions have been prepared as the photoconductors in the liquid crystal light valves. The impedance matching conditions of the a-Si: H and the heterojunction in the valves...

Jianmin Qiao, Gaorong Han, Piyi Du, Weiqiang Han… in MRS Online Proceedings Library (1991)

Article

Molecular Beam Epitaxy of Zn_l−x Cd_x Se/ZnSe Heterostructures And Their Optical Properties

Superlattices and quantum wells of Zn_l−xCd_xSe/ZnSe, and heterostructures based on ZnSe/CdSe digital alloys have been grown by molecular beam epitaxy (MBE). Their optical properties were studied with particular em...

H. Luo, N. Samarth, J. K. Furdyna, H. Jeon, J. Ding… in MRS Online Proceedings Library (1991)

Article

Deformation behaviour in α/β two-phase super-plastic brass

α/β brass consists of hard α and soft β phase in its superplastic temperature range. Because of the difference between their mechanical properties, the superplastic behaviour of the alloy differs from that of ...

Ding Hua, Wu Qingling, Ma Longxiang in Journal of Materials Science (1992)

Article

Deformation behaviour in α/β two-phase super-plastic brass

α/β brass consists of hard α and soft β phase in its superplastic temperature range. Because of the difference between their mechanical properties, the superplastic behaviour of the alloy differs from that of ...

Ding Hua, Wu Qingling, Ma Longxiang in Journal of Materials Science (1992)

Article

SEM examination of the oxide-metal interface formed during the aqueous corrosion of a Zr-2.5 wt% Nb alloy

The oxide-metal interface formed during the aqueous corrosion of a Zr-2.5 wt% Nb alloy has been studied by SEM, using a specimen preparation method which also has potential application to other materials conta...

Y. Ding, D. O. Northwood in Journal of Materials Science (1992)

Article

In-situ deposition of superconducting YBCO thin films by magnetron sputtering from powder target

We have used stoichiometric Y₁Ba₂Cu₃O_7−x powder as magnetron sputtering target to deposit high-quality high-T _c superconducting thin films on MgO, SrTiO₃, and ZrO₂ substrates....

W. G. Luo, A. L. Ding, K. S. Chan, G. G. Shi, A. Cheng… in Journal of Superconductivity (1992)

Article

Theory of hydrogen-assisted crack growth

A model for hydrogen-induced cracking is proposed and developed on the assumption that hydrogen enters the embrittling process zone (EPZ) ahead of the crack-tip and promotes localized plastic flow which is pro...

Ding Hong-Zhi, **ng **u-San in Journal of Materials Science (1992)

Article

Transition elements matching the near crack-tip strain field

New transition elements used with the collapsed triangular singular elements are constructed by using the improved isoparametric transformations. Without 1/r singular terms, the new transition elements' strain fi...

Ding Haojiang, He Wenjun in International Journal of Fracture (1992)

Article

Synthesis of diamond crystals and films using an oxygen-acetylene flame under atmosheric pressure

Diamond growth with rates up to 100 to 140 μm/hr was achieved using an oxygen-acetylene combustion spraying technique in an atmospheric environment. Investigations on the processing indicated that the gas flow...

H. -C. Chiao, H. -L. Lin, X. -T. Li, C. -X. Ding in Journal of Thermal Spray Technology (1992)

Article

Voltage reduction for photorefractive two-wave mixing in InP:Fe by optical gap control

We report a method to increase the photorefractive two-wave mixing gain coefficient Γ in semiconductors by using additional incident laser radiation. Two auxiliary beams are used to optimize the spatial distri...

Y. Ding, H. J. Eichler, B. Smandek in Applied Physics A (1992)

Article

Picosecond photorefractive diffraction in CdTe at 1 μm

Using a ps-transient grating technique the contribution of the ps-photorefractive effect to the first-order probe-beam diffraction signal has been studied in CdTe at 1 μm investigating diffraction kinetics at ...

I. Rückmann, J. Kornack, J. Kolenda, M. Petrauskaus, Y. Ding… in Applied Physics A (1992)

Article

“Links” instruments for measuring gears

N. N. Markov, Ding Teng-Du in Measurement Techniques (1992)

Article

Reactions of Titanium Films with thin Silicon Dioxide, Nitride, and Oxynitride Films During Rapid Thermal Annealing

The interactions of Ti with SiO₂, Si₃N₄, and SiOiNy have been studied during rapid thermal annealing at 400 to 900 °C in Ar with 3% H₂ ambient. X-ray diffraction, sheet resistance measurements, RBS, nuclear react...

Sen-Hou Ko, N. M. Devashrajee, Shyam P. Murarka… in MRS Online Proceedings Library (1992)