1,720 research outputs found
TechnoFile: Viscosity
The article focuses on the effect the viscosity of a glaze or slip has on a piece of pottery. The article explains the term and provides tests that can be performed to determine the viscosity of a substance. It goes on to describe how one can manipulate the viscosity of a glaze or slip through the addition of water or other aids and includes step-by-step instructions for making a slip
Techno File: Pyrometric Cones
A pyrometer measures temperature, but pyrometric cones measure heatwork. What is a cone, how does it work, and what does any of this have to do with synchronized swimmers? [excerpt
Chasing the Craze: When the Right Variables are Off-Stage
A smooth white glaze, (Figure 1) with a buttery surface and smooth breaking on edges, just enough change of whiteness in a crevice pooling, seemingly opaque when thicker, but with a certain glow, a slight grey showing through. It crazes slightly, a fine webbing of cracks. Not enough to be decorative crazing, and not enough crazing to make me abandon the glaze, but enough crazing that I would like it to be gone. I prefer a system-oriented testing approach as a kind of universal order. A simple Unity Molecular Formula grid mapping method typically shows a boundary line of crazed and non-crazed surfaces and trends in surface quality. Sounds simple enough. But, as has been said, there is no need to seek the ceramic troubles. They will find you. (excerpt
Techno File: Glaze Unity Formula
There are many approaches to modifying a glaze recipe, and different approaches can meet different needs. Some modifications change the colorant level while others change the colorant type altogether. Some may directly replace one material with another add a few weight unit more (or less) of one of the base ingredients in the recipe, or add an amount of an entirely new ingredient. These strategies we use to alter glazes tent to parallel how we cook and modify recipes in the kitchen, but adjustments to the base glaze using the kitchen method do not always give us the results we want. [excerpt
Performance Analysis of Throughput Efficient Switch-over between FSO and mmW Links
Free Space Optics (FSO) links provide usage of high bandwidth and the flexibility of wireless communication links. However, weather patterns like fog and heavy snow fall limit the availability of FSO. Another technology providing similar properties regarding offered data rates and flexibility of setup is Millimeter Wave Technology (mmW), operating at several tens of GHz. In this case, heavy rain limits mmW link availability. A combination of both technologies had been proved to be very effective to achieve very high availability. Different hybrid architectures of these two links and switch-over techniques had been proposed in the recent years. All of these techniques require redundant transmission on either both transmission links or waste bandwidth of backup link when main FSO link is operational. In this paper, a switch-over between these technologies is proposed, to maintain high availability without the loss of transmission bandwidth. The performance of this switch-over has been simulated for more than one year measured availability data for hybrid network of mmW link and FSO link. The switch over behavior has also been simulated for fog, rain and snow events. It has been shown that the availability with switch-over reaches the redundant link availability but switchover can save more than 90% redundant transmission and increase the hybrid network throughput significantly
syn,syn-15,17-Di-2-naphthylhexacyclo[10.2.1.13,10.15,8.02,11.04,9]heptadecane deuterochloroform monosolvate
The main molecule of the title compound, C37H36·CDCl3, is a hydrocarbon with two naphthalene segments attached to opposite ends of a rigid norbornylogous spacer with an overall structure that is approximately C-shaped. The dihedral angle between the naphthalene ring planes is 9.27 (7)°. The cleft that exists between the naphthalene rings is large enough that the compound crystallizes with a solvent molecule (CDCl3) in the cleft. The CDCl3 solvent molecule is present in two disordered orientations in a 3:2 ratio, each involving C—D⋯π to C
6 ring centers
Interpretable Subgroup Discovery in Treatment Effect Estimation with Application to Opioid Prescribing Guidelines
The dearth of prescribing guidelines for physicians is one key driver of the
current opioid epidemic in the United States. In this work, we analyze medical
and pharmaceutical claims data to draw insights on characteristics of patients
who are more prone to adverse outcomes after an initial synthetic opioid
prescription. Toward this end, we propose a generative model that allows
discovery from observational data of subgroups that demonstrate an enhanced or
diminished causal effect due to treatment. Our approach models these
sub-populations as a mixture distribution, using sparsity to enhance
interpretability, while jointly learning nonlinear predictors of the potential
outcomes to better adjust for confounding. The approach leads to
human-interpretable insights on discovered subgroups, improving the practical
utility for decision suppor
Coarse-grained reconfigurable array architectures
Coarse-Grained Reconfigurable Array (CGRA) architectures accelerate the same inner loops that benefit from the high ILP support in VLIW architectures. By executing non-loop code on other cores, however, CGRAs can focus on such loops to execute them more efficiently. This chapter discusses the basic principles of CGRAs, and the wide range of design options available to a CGRA designer, covering a large number of existing CGRA designs. The impact of different options on flexibility, performance, and power-efficiency is discussed, as well as the need for compiler support. The ADRES CGRA design template is studied in more detail as a use case to illustrate the need for design space exploration, for compiler support and for the manual fine-tuning of source code
Russell Lecture: Dark Star Formation and Cooling Instability
Optically thin cooling gas at most temperatures above 30K will make
condensations by pressure pushing material into cool dense regions. This works
without gravity. Cooling condensations will flatten and become
planar/similarity solutions. Most star formation may start from cooling
condensations - with gravity only important in the later stages. The idea that
some of the dark matter could be pristine white dwarfs that condensed slowly on
to planetary sized seeds without firing nuclear reactions is found lacking.
However, recent observations indicate fifty times more halo white dwarfs than
have been previously acknowledged; enough to make the halo fraction observed as
MACHOS.
A cosmological census shows that only 1% of the mass of the Universe is of
known constitution.Comment: 32 Pages, Latex (uses aastex & natbib), 5 eps figures, submitted to
ApJ April 200
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