47,360 research outputs found
Graphite as a structural material in conditions of high thermal flux: a survey of existing knowledge and an assessment of current research and development
The state of fundamental knowledge on the subject of graphite and
the graphitisation process is reviewed. The principle methods of
manufacture may be considered to include (1) conventional graphitisation
of a coke filler-binder mix, (2) the compaction at high pressure and
temperatures of natural or artificial graphite particles without a binder,
(3) pyrolytic graphites derived from gaseous deposition, and (4)
conventional graphites impregnated by liquid or gas and re-graphitised.
The present state of development of these processes is examined. The
erosion of graphite by high velocity gases at high temperatures is due
primarily to oxidation effects which occur preferentially at crystallite
boundaries. Coatings of carbides and nitrides improve the resistance
at temperatures below about 1700 degrees C, but above this, pyrolytic coatings
are more successful. The addition of vapourising compounds, iodides and
fluorides, or the addition of carbides and nitrides to the graphite
mix, are both beneficial, but of little value at very high temperatures.
The development of new graphites, either the impregnated type, or those produced by pressure baking, may offer a margin of improvement, as the
best surface structure at temperatures of 3000 degrees C and above appears to
be simply graphite. Additions may do little to improve the mechanism
of erosion, but they may usefully lower the surface temperature.
Considerations relating to thermal shock, creep and fabrication are
surveyed. Some of the conclusions are: that graphite is of singular
importance to high temperature technology; that commercial issues
cannot be allowed to impede vigorous development towards more resistant
forms; that much is to be gained by viewing graphite from a metals
standpoint; that the fundamental theory of the basic crystal mechanics
is undeveloped; that the present wide variability in properties should
not be regarded overseriously; that non-destructive assessment by
damping measurements needs development, that coatings and impregnants
are of high priority, and that, of all factors, oxidation is the most
serious limitation to use at the present time
The ALEPH Search for the Standard Model Higgs Boson
A search has been performed for the Standard Model Higgs boson in the data
collected with the ALEPH detector in 2000. An excess of 3 sigma above the
background expectation is found. The observed excess is consistent with the
production of the Higgs boson with a mass close to 114 GeV/c2.Comment: 5 pages, 5 figure
Temperature effects on material characteristics
Some of the physical properties of the main elements of interest in
high temperature technology are reviewed. Some general trends emerge
when these properties are viewed as a function of melting point, but there
are a few notable exceptions. Titanium, zirconium, niobium and tantalum
all have disappointingly low moduli; chromium is excellent in many ways,
but has a limited ductility at lower temperatures; molybdenum oxidises
catastrophically above about 700° C, and niobium suffers from severe
oxygen embrittlement. Beryllium and carbon (in the graphitic form) both
stand out as exceptional materials, both have very low densities, beryllium
a very high modulus but an unfortunately low ductility, while graphite has
a relatively low strength at the lower temperatures, although at temperatures
of 2000° C and above it emerges as a quite exceptional (and probably as the
ultimate) high temperature material. Some of the fundamental factors
involved in high temperature material development are examined, in the
light, particularly, of past progress with the nickel alloys. If a similar
progress can be achieved with other base elements then a considerable
margin still remains to be exploited. Protection from oxidation at high
temperatures is evidently a factor of major concern, not only with metals,
but with graphite also. Successful coatings are therefore of high importance and the questions they raise, such as bonding, differential thermal expansion,
and so on, represent aspects of an even wider class covered by the term
“composite structures". Such structures appear to offer the only serious
solution to many high temperature requirements, and their design,
construction and utilization has created a whole series of new exercises
in materials assessment. Matters have become so complex, that a very
radical and fundamental reassessment is required if we are to change, in
any very significant way, the wasteful and ad hoc methods which characterise
so much of present-day materials engineering
Preliminary Test of Prescribed Burning for Control of Maple Leaf Cutter (Lepidoptera: Incurvariidae)
Leaf litter burning in the spring resulted in 87.5% mortality of maple leaf cutter pupae, Paraclemensia acerifoliella (Fitch). No apparent damage was observed on sugar maple or beech trees within the burn area
Emulation of multivariate simulators using thin-plate splines with application to atmospheric dispersion
It is often desirable to build a statistical emulator of a complex computer simulator in order to perform analysis which would otherwise be computationally infeasible. We propose methodology to model multivariate output from a computer simulator taking into account output structure in the responses. The utility of this approach is demonstrated by applying it to a chemical and biological hazard prediction model. Predicting the hazard area which results from an accidental or deliberate chemical or biological release is imperative in civil and military planning and also in emergency response. The hazard area resulting from such a release is highly structured in space and we therefore propose the use of a thin-plate spline to capture the spatial structure and fit a Gaussian process emulator to the coefficients of the resultant basis functions. We compare and contrast four different techniques for emulating multivariate output: dimension-reduction using (i) a fully Bayesian approach with a principal component basis, (ii) a fully Bayesian approach with a thin-plate spline basis, assuming that the basis coefficients are independent, and (iii) a “plug-in” Bayesian approach with a thin-plate spline basis and a separable covariance structure; and (iv) a functional data modeling approach using a tensor-product (separable) Gaussian process. We develop methodology for the two thin-plate spline emulators and demonstrate that these emulators significantly outperform the principal component emulator. Further, the separable thin-plate spline emulator, which accounts for the dependence between basis coefficients, provides substantially more realistic quantification of uncertainty, and is also computationally more tractable, allowing fast emulation. For high resolution output data, it also offers substantial predictive and computational ad- vantages over the tensor-product Gaussian process emulator
PSD-95 Is Associated with the Postsynaptic Density and Not with the Presynaptic Membrane at Forebrain Synapses
PSD-95, a prominent protein component of the postsynaptic density (PSD) fraction from rat forebrain, has been localized by light microscopy to dendrites of hippocampal neurons (Cho et al., 1992) and to the presynaptic plexus of cerebellar basket cells (Kistner et al., 1993). Here we extend these studies to show that an affinity-purified antibody to PSD-95 labels the dendrites of most neurons in the forebrain and of a subset of neurons in the cerebellum. To confirm that PSD-95 is associated with the PSD at forebrain synapses and to clarify whether it is also associated with the presynaptic membrane, we employed immunogold electron microscopy of forebrain synaptosomes. Gold-labeled antibodies to PSD-95 labeled postsynaptic densities in both intact and lysed forebrain synaptosomes but did not label presynaptic terminals or the presynaptic membrane. The asymmetric distribution of PSD-95 at synapses contrasts with that of its homologs, disks-large and ZO-1, which are arranged symmetrically at septate and tight junctions, respectively
High power coupled CO2 waveguide laser array
A hollow-bore ridge waveguide technique for phase locking arrays of coupled CO2 rf excited waveguide lasers was demonstrated. Stable phase-locked operation of two- and three-channel arrays has been demonstrated at the 50 W output level. Preliminary experiments with a five-element array generated an output power of 95 W but phase-locked operation was not conclusively demonstrated
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