Rietveld Quantitative Phase Analysis of Oil Well Cement: In Situ Hydration Study at 150 Bars and 150 °C

William Osler at 150.

An in situ powder diffraction study of the structural mixed-phase of YBa2Cu3O6+x at 200 and 300C

In this study, the YBa2Cu3O6+x samples at temperatures 200 and 300°C, as the value of x ( the oxygen content in 0the basal plane)  increased under nearly thermodynamical equilibrium condition, the structure changed from the well- known tetragonal (T) to a mixed-phase (T+OII) region (orthorhombicII phase is a superstructure). This mixed-phase region suggests a first order T/OII phase transition ...

A 150-MHz Translinear Phase-Locked Loop

This paper describes the design and implementation of a current-mode phase-locked loop (PLL) using static and dynamic (log-domain) translinear circuits. The loop is fully tuneable, with independent control of center frequency and loop bandwidth. The loop employs a recently proposed current-mode “log-domain” oscillator in a classical PLL topology to obtain these features. The PLL has been fabric...

The National Academy of Sciences at 150.

of the United States and began to compile data annually to provide the record of all sorts of domains of American life. Data on population, finance, commerce, agriculture, exports, mining, railroads, telegraphs, immigration, education, and public lands were all published and developed into time series collections thereafter. The leaders of the Federal Statistical System became major leaders in ...

Redetermination of 3-methyl­isoquinoline at 150 K

The structure of the title compound, C(19)H(9)O, has been redetermined at 150 K. The redetermination is of significantly higher precision than a previous room-temperature structure [Ribar et al. (1974 ▶). Cryst. Struct. Commun.3, 323-325]. The C-N bond lengths for this redetermination are much closer to those observed in comparable structures, and the orientation of the methyl group with respec...