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This thesis deals primarily with the eastern Islamic world during the period 1000-40. It attempts to delineate the structure of the Ghaznavid empire, its personal and administrative aspect (Part I) and its military aspect (Part II). The material used in Part II has already appeared in substantially similar form as "Ghaznevid military organisation" in Der Islam, XXXVI, 1960, 37-77. Against this background, the province of Khurasan under Ghaznavid rule, and in particular, the city of Nishapur, are described (Part III). The irruption of the Seljuqs is treated in Part V. However, a survey of what is known of the Oghuz before these migrations is prefixed to this (Part IV). It summarises presently-held views, attempting to synthesise the work of Central Asian specialists, Turcologists, historians and archaeologists, who alone are competent t...
The development, capabilities, and products of the computer-based retrieval system of the Jet Propulsion Laboratory Library are described. The system handles books and documents, produces a book catalog, and provides a machine search capability. Programs and documentation are available to the public through NASA's computer software dissemination program.
This paper discusses the use of fluidic devices for measurement and control in the presence of hostile environments. Various applications are presented together with possible solutions by the use of fluidics. Several fluidic devices, components and circuits are described which may be adapted to fluidic measurement and control of processes where other methods fail or become extremely difficult or damaging to the instrumentation. Devices and techniques described include a description of a capillary temperature probe including both probe and circuit designs, and several possible techniques which may be used in the design and testing of fluidic devices.
Pressure-letdown valve combines quasi-porous-plug and vortex-chamber in one controllable unit. Valve useful in fossil-energy plants for reducing pressures in such erosive two-phase process streams as steam/water, coal slurries, or combustion gases with entrained particles. Quasi-Porous Plug consists of plenums separated by perforated plates. Number or size of perforations increases with each succeeding stage to compensate for expansion. In Vortex Chamber, control flow varies to control swirl and therefore difference between inlet and outlet pressures.
A two-level dynamic-thermodynamic sea ice model is used to simulate the growth, drift and decay of sea ice in the Northern Hemisphere during a 30-year period, 1951 to 1980. The model is run with a daily timestep on a 222 km grid and is forced by interanually varying fields of geostrophic wind and temperature-derived thermodynamic fluxes. The objective is a quantitative description of large-scale sea ice variability in terms of the dynamic and thermodynamic processes responsible for the fluctuations, especially in the North Atlantic where sea ice represents a substantial input of fresh water. The fields of ice velocity and thickness contain strong seasonal as well as interannual variability. The mean drift pattern results in thicknesses of 4 to 5 m offshore of northern Canada and Greenland, while winter thicknesses of approximately 2 m ...
Technique adapts analogous ocean-floor-mapping technology. Existing ocean floor acoustic technology adapted for real-time monitoring of thickness and viscosity of flowing slag in coal-conversion processing.
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