1,867 research outputs found
An investigation of the effects of radiation on silicon nitride insulated gate /MNS/ transistors Final report
Radiation effects on silicon nitride insulated gate field effect transistor
Investigation of new concepts of adaptive devices Quarterly technical report, 3 Dec. 1968 - 2 Mar. 1969
Conduction mechanisms and transient behavior of memory device using semiconductor device
Investigation of new concepts of adaptive devices Quarterly technical report, 3 Mar. - 2 Jun. 1969
Charge decay processes in memory device and in new metal nitride semiconductor light-sensitive memory elemen
Seismic Response to Injection Well Stimulation in a High-Temperature, High-Permeability Reservoir
Fluid injection into the Earth's crust can induce seismic events that cause damage to local infrastructure but also offer valuable insight into seismogenesis. The factors that influence the magnitude, location, and number of induced events remain poorly understood but include injection flow rate and pressure as well as reservoir temperature and permeability. The relationship between injection parameters and injection-induced seismicity in high-temperature, high-permeability reservoirs has not been extensively studied. Here we focus on the Ngatamariki geothermal field in the central Taupō Volcanic Zone, New Zealand, where three stimulation/injection tests have occurred since 2012. We present a catalog of seismicity from 2012 to 2015 created using a matched-filter detection technique. We analyze the stress state in the reservoir during the injection tests from first motion-derived focal mechanisms, yielding an average direction of maximum horizontal compressive stress (SHmax) consistent with the regional NE-SW trend. However, there is significant variation in the direction of maximum compressive stress (σ1), which may reflect geological differences between wells. We use the ratio of injection flow rate to overpressure, referred to as injectivity index, as a proxy for near-well permeability and compare changes in injectivity index to spatiotemporal characteristics of seismicity accompanying each test. Observed increases in injectivity index are generally poorly correlated with seismicity, suggesting that the locations of microearthquakes are not coincident with the zone of stimulation (i.e., increased permeability). Our findings augment a growing body of work suggesting that aseismic opening or slip, rather than seismic shear, is the active process driving well stimulation in many environments
Investigation of new concepts of adaptive devices Quarterly technical report, 15 Sep. - 14 Dec. 1967
Charge storage behavior of multiple layer etched silicon semiconductor devic
Deriving Bisimulation Congruences: 2-categories vs precategories
G-relative pushouts (GRPOs) have recently been proposed by the authors as a new foundation for Leifer and Milner’s approach to deriving labelled bisimulation congruences from reduction systems. This paper develops the theory of GRPOs further, arguing that they provide a simple and powerful basis towards a comprehensive solution. As an example, we construct GRPOs in a category of ‘bunches and wirings.’ We then examine the approach based on Milner’s precategories and Leifer’s functorial reactive systems, and show that it can be recast in a much simpler way into the 2-categorical theory of GRPOs
Investigation of new concepts of adaptive devices Quarterly technical report, 15 Dec. 1967 - 14 Mar. 1968
Fabrication, properties, and application of metal nitride semiconductor/variable threshold transistor memory devic
Structure of an aliphatic amidase from Geobacillus pallidus RAPc8
The amidase from Geobacillus pallidus RAPc8, a moderate
thermophile, is a member of the nitrilase superfamily and
catalyzes the conversion of amides to the corresponding
carboxylic acids and ammonia. It shows both amide-hydrolysis
and acyl-transfer activities and also exhibits stereoselectivity
for some enantiomeric substrates, thus making it a potentially
important industrial catalyst. The crystal structure of
G. pallidus RAPc8 amidase at a resolution of 1.9 A ˚ was
solved by molecular replacement from a crystal belonging to
the primitive cubic space group P4232. G. pallidus RAPc8
amidase is homohexameric in solution and its monomers have
the typical nitrilase-superfamily α-β-β-α fold. Association in
the hexamer preserves the eight-layered α-β-β-α:α-β-β-α
structure across an interface which is conserved in the known
members of the superfamily. The extended carboxy-terminal
tail contributes to this conserved interface by interlocking the
monomers. Analysis of the small active site of the G. pallidus
RAPc8 amidase suggests that access of a water molecule to the
catalytic triad (Cys, Glu, Lys) side chains would be impeded by
the formation of the acyl intermediate. It is proposed that
another active-site residue, Glu142, the position of which is
conserved in the homologues, acts as a general base to catalyse
the hydrolysis of this intermediate. The small size of the
substrate-binding pocket also explains the specificity of this
enzyme for short aliphatic amides and its asymmetry explains
its enantioselectivity
Is life a thermal horizon ?
This talk aims at questioning the vanishing of Unruh temperature for an
inertial observer in Minkovski spacetime with finite lifetime, arguing that in
the non eternal case the existence of a causal horizon is not linked to the
non-vanishing of the acceleration. This is illustrated by a previous result,
the diamonds temperature, that adapts the algebraic approach of Unruh effect to
the finite case.Comment: Proceedings of the conference DICE 2006, Piombino september 200
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