2,216 research outputs found
A review of alternative approaches to the reduction of CO2 emissions associated with the manufacture of the binder phase in concrete
In this review we discuss a wide range of alternative approaches to the reduction of CO2 emissions associated with the manufacture of the binder phase in concrete. They are classified broadly as follows: (1) Use alternative fuels and/or alternative raw materials in the manufacture of Portland-based cements. (2) Replace Portland clinker with âlow-carbonâ supplementary cementitious materials (SCMs) in concrete. (3) Develop alternative low-carbon binders not based on Portland clinkers. The first approach mainly represents incremental improvements that can be achieved fairly easily and cheaply as long as suitable raw materials can be found. The second approach ranges from incremental improvements, if low levels of SCM substitution are used, all the way to major innovations for binders with very high Portland clinker replacement levels. The third approach is the most risky but also holds the greatest promise for truly significant CO2 reductions if it can be implemented on a large scale
Electromagnetically excited acoustic resonance for evaluating attenuation coefficient and grain size in polycrystalline metals
Copyright 1994 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters, 64(17), 2217-2219, 1994 and may be found at http://dx.doi.org/10.1063/1.11167
Resonance EMAT system for acoustoelastic stress measurement in sheet metals
Copyright 1993 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Review of Scientific Instruments, 64(11), 3198-3205, 1993 and may be found at http://dx.doi.org/10.1063/1.114432
Nonlinear resonance interaction of ultrasonic waves under applied stress
Copyright 1984 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics, 56(1), 235-237, 1984 and may be found at http://dx.doi.org/10.1063/1.33375
Leaky Lamb Wave Along VCR Magnetic Tapes
High recording density with the home-use digital VCRs requires the use of narrow tracks, short recording wavelength, and thin magnetic tapes. Knowledge of Youngâs modulus of the tape is essential for the precise positioning of the tape on the rotating drums and then a stable tape-to-head interface. The magnetic tapes usually show different Youngâs moduli for the machine direction (MD) and the transverse direction (TD) [1]. The anisotropy develops mainly in the base film of polyethylene terephthalate (PET) through the partial crystallization and the crystallite orientation alignment during the stretching process on the tapes [2], while the original PET sheet, from which the tapes are cut, shows much less anisotropy. This situation requires the determination of Youngâs moduli for both MD and TD of the tape. The tapes on play are straightened by tensile loads, which should be controlled with Youngâs modulus for the MD. Too much load may distort the recorded tracks or damage the tape. Besides, the vertical load is applied onto both edges of the running tape by the guiding rollers. Again, too much load may induce the tape buckling. Critical load is proportional to the Youngâs modulus in the TD. Large moduli are desirable for both directions
Epitaxial growth of room-temperature ferrimagnetic semiconductor thin films based on the ilmenite-hematite solid solution
Advanced EMAT-Resonant Technique for Assessment of Damage Accumulation and Remaining Life of Crept Stainless Steel
Many of fossil power plants, which were constructed during 1960âs and 70âs and exceed more than 10,000 working hours, have presently been operating while they have been receiving progressive damage, mainly from creep, as the time proceeds. [1, 2] Furthermore, by shifting the base load of power from fossil power plants to nuclear power plants, they are faced to even more severe operating condition such as daily or weekly startup and shutdown in order to correspond to rapid change of the demand for power. As the consequence of this trend, the materials degradation was accelerated. Therefore, a nondestructive technique is now highly required for safely operating plants and predicting the remaining life. It is also important for the technique to be simple and quick-operating to cope with the large number of measuring points
A novel human hair protein fiber prepared by watery hybridization spinning
This is a preprint of an article published in [Hirao, Y; Ohkawa, K; Yamamoto, H; Fujii, T.,A novel human hair protein fiber prepared by watery hybridization spinning,MACROMOLECULAR MATERIALS AND ENGINEERING,Vol 290,165-171(2005)]ArticleMACROMOLECULAR MATERIALS AND ENGINEERING. 290(3): 165-171 (2005)journal articl
Tunneling-assisted thermalization and recombination of nonequilibrium carriers in localized states : Application to the frequency-resolved drift mobility in amorphous silicon
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