798 Result(s)
within
Conference Paper
**u-**u Zhang
Characterization and Evaluation of Materials
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Chapter and Conference Paper
The Application of Neutron Radiography to the Measurement of the Water-Permeability of Concret
The water-permeability of concret is significant for dam, offshore plateform and underwater basement of bridge etc. The traditional measuring method of permeability is the fixed pressure of water method in whi...
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Chapter and Conference Paper
Neutron Radiography Study in Tsinghua University
The work of Neutron Radiography described in this paper was performed at the research reactor of Tsinghua University, which is a pool-type light water reactor with a power of 2 MW. This neutron radiography sys...
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Chapter and Conference Paper
Propylene Polymerizations with Group 4 Metallocene/Alumoxane Systems
The existing Ti and Zr metallocene/methylalumoxane (MAO) isospecific propylene polymerization catalyst systems are unsuitable at conventional polymerization temperatures. The most significant problems have bee...
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Chapter and Conference Paper
Plastic Flow, Instability and Modes of Failure in the Uniaxial Compression of Porous Cylinders
Gurson’s mixed hardening plasticity model, with strain- and stress-controlled nucleations, was used in a large deformation finite element program to study the plastic flow and damage in the uniaxial compressio...
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Chapter and Conference Paper
Micromechanical Modelling and Computation of Shakedown with Nonlinear Kinematic Hardening — Including Examples for 2D-Problems
A static shakedown theorem is presented using a micromechanical overlay model which simulates elastic-plastic material behaviour with nonlinear kinematic hardening. It is a generalization of the Melan theorem ...
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Chapter and Conference Paper
Creep Instability of Spinning Viscoelastic Rod
In this paper, A general theory for studying dynamic instability of viscoelastic spinning rod (shaft, arm etc.) is presented. The continuous and multi-degree-of-freedom(MDOF) discrete model are both considered...
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Chapter and Conference Paper
Shear Band Development in a Viscoplastic Cylinder
We study the development of shear bands in a viscoplastic hollow circular cylinder containing two elliptical voids on a radial line and located symmetrically about the center. The material of the cylinder is a...
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Chapter and Conference Paper
Polymethylsilane as a Precursor to High Purity Silicon Carbide
Polymethylsilane, -[MeHSi]x-, synthesized by dehydrogenative coupling of MeSiH3, will when heated to temperatures in excess of 800°C give almost pure, nanocrystalline SiC. The chemical evolution of polymer to cer...
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Chapter and Conference Paper
Diffusion Bonding of Si3n4 to Metals by Hip used for High Temperature Applications
In the last few years there has been growing interest in the joining of metals to ceramics for use as structural materials. Diffusion bonding of Si3N4 to the new generation of ODS-superalloys, such as MA-6000, is...
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Chapter and Conference Paper
High-Tc Low-Noise dc SQUIDs Operating at 77K
We have used a superconductor-normal metal-superconductor (SNS) step-edge technique to produce low-noise dc SQUIDs operating at 77 K. The device fabrication process is both reproducible and manufacturable, and...
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Chapter and Conference Paper
Phase Assemblages in the Melt State in Ag-Sheathed Bi-2212 Tape in 1% and 7.5% O2
Ag-sheathed Bi-2212 (Bi2Sr2CaCu2Ox) tape has been melt processed in 1% and 7.5% O2 remainder N2 atmospheres. In 7.5% O2 the melt from which 2212 forms on cooling contained liquid, (Sr,Ca)CuO2 (1:1), and (Sr,Ca)2C...
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Chapter and Conference Paper
Microwave Penetration Depth Measurements as a Probe of the Superconducting State of YBCO
Using microwave cavity perturbation techniques we have made a series of precision measurements of the penetration depth, ⋋, of single crystals of YBa2Cu3OX. The studies have been made on nominally pure twinned an...
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Chapter and Conference Paper
Effect of Current Amplitude and Coupling Strength on the microwave Performance of YBa2Cu3O7-x SQUIDs at 3 GHz
The microwave properties of hysteretic single junction SQUIDs coupled to half-wavelength microstrip resonators were investigated at 3 GHz between 4.2 and 80 K. The samples were prepared from epitaxial YBa2Cu3O7-x
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Chapter and Conference Paper
Micro FT-IR and EXAFS Studies on Periodic and Chaotic Precipitation in Bile Salt Systems
Micro FT-IR and EXAFS spectroscopy methods were utilized to characterize the periodic and chaotic precipitation occuring in some metal bile salt systems in sol-gel medium. The results indicate that the precipi...
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Chapter and Conference Paper
Novel H-bonding in Acid Soaps and Pressure-induced Proton Shift. An FT-IR Approach
Acid potassium soaps (KHA2, in which A stands for carboxylate) of myristic acid, palmitic acid, and stearic acid were studied with a Fourier-transform infrared spectrometer. The infrared spectra of the acid soaps...
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Chapter and Conference Paper
FT-IR Study of the Coordination of an Organophosphonic Acid with Lanthanide Ions
The coordination interaction between saponified 2-ethyl-hexylphosphonic acid mono-2-ethylhexyl ester (HEHEHP) with lanthanide ions [Ln(III)] in an extracted organic phase has been studied by FT-IR spectral ana...
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Chapter and Conference Paper
Infrared Spectroscopic Characterization of the Crystallinity and the Hydrocarbon Chain Packing of the Polyethylene Segments in Poly(ethylene-co-dimethylaminoethyl Methacrylate)
The multicrystalline behaviour and the crystallinity of poly(ethylene-co-dimethylaminoethyl methacrylate) were investigated by infrared spectroscopy. The metastable monoclinic packing structure of the polyethy...
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Chapter and Conference Paper
A Procedure for Testing the Radiometric Accuracy of Fourier-transform Infrared Spectrometers
We present a simple procedure for evaluation of FT-IR radiometric accuracy, which incorporates the use of calibrated standard reference materials. It starts with the standard practice for testing the FT-IR perfor...
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Chapter and Conference Paper
Far-Infrared Spectra of Kaolinite/Alkali Metal Halide Complexes
Photoacoustic and diffuse reflectance spectra between ~ 200 and 700 cm-1 are reported for six kaolinite/alkali metal halide complexes. Significant modifications of the kaolinite bands are caused by intercalation ...
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Chapter and Conference Paper
Photothermal Absorption Spectroscopy of Mica
Infrared absorption by mica produces an elastic wave that is detected by lead zirconate titanate (PZT) in intimate contact with the sample. The interferogram recorded with an FT-IR spectrometer at a mirror spe...
