1,495 research outputs found
Contact material for pressure-sintering ferrites
Pressure-sintering, in which the unfired laminated ferrite plane is placed between two flat punches and pressed during firing, reduces lateral firing shrinkage to less than one percent. A decrease in thickness of the laminate produces the required volume shrinkage. Phlogopite is the most suitable contact material investigated
Laminated ferrite memory fabrication
Powder and slurry preparation, and sheet and conductive line fabrication for laminated ferrite memory arra
Fecundity of Quail in Spacelab Microgravity
Flight experiments in which fertilized Japanese quail eggs were allowed to develop to various ages in space, and the results of the following laboratory tests are described. Laboratory-based experiments concerned with the embryonic development of Japanese quail in gravity using simulated vibrations and G-force are reported. Effect of turning and ambient temperature at various days of incubation on the development of Japanese quail, and method to feed and water adult and newly hatched Japanese quail in microgravity using a gelatin-based diet as a solid water supply, are also described
Conditioning of Leverage Scores and Computation by QR Decomposition
The leverage scores of a full-column rank matrix A are the squared row norms
of any orthonormal basis for range(A). We show that corresponding leverage
scores of two matrices A and A + \Delta A are close in the relative sense, if
they have large magnitude and if all principal angles between the column spaces
of A and A + \Delta A are small. We also show three classes of bounds that are
based on perturbation results of QR decompositions. They demonstrate that
relative differences between individual leverage scores strongly depend on the
particular type of perturbation \Delta A. The bounds imply that the relative
accuracy of an individual leverage score depends on: its magnitude and the
two-norm condition of A, if \Delta A is a general perturbation; the two-norm
condition number of A, if \Delta A is a perturbation with the same norm-wise
row-scaling as A; (to first order) neither condition number nor leverage score
magnitude, if \Delta A is a component-wise row-scaled perturbation. Numerical
experiments confirm the qualitative and quantitative accuracy of our bounds.Comment: This version has been accepted to SIMAX but has not yet gone through
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Theory Summary and Future Directions
Summary talk at the Lepton-Photon Symposium, Cornell University, Aug. 10-15,
1993.Comment: (Talk presented at the Lepton-Photon Symposium, Cornell University,
Aug. 10-15, 1993.) 19 page
Some thermophysical property measurements of porous ceramic ''Glassrock''
Thermophysical properties of porous ceramic material - thermal conductivity, specific heat, density, and porosity measurement
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Management of pediatric uveitis
Pediatric uveitis is a topic of special interest not only because of the unique diagnostic and therapeutic challenges but also because of the lifetime burden of vision loss if the problem is not adequately treated, as well as the economic and psychological toll on the family. Often, uveitis in children is discovered as part of a routine eye exam; this silent, insidious inflammation can be difficult to treat and can lead to further complications if not handled skillfully. Corticosteroids have long been the mainstay of therapy; however, the significant associated side effects mandate a corticosteroid-sparing therapeutic regimen in pursuit of remission. In this review, we cover the therapeutic options for pediatric uveitis, specifically focusing on the most common non-infectious varieties, juvenile idiopathic arthritis-associated uveitis and pars planitis
A negative mass theorem for surfaces of positive genus
We define the "sum of squares of the wavelengths" of a Riemannian surface
(M,g) to be the regularized trace of the inverse of the Laplacian. We normalize
by scaling and adding a constant, to obtain a "mass", which is scale invariant
and vanishes at the round sphere. This is an anlaog for closed surfaces of the
ADM mass from general relativity. We show that if M has positive genus then on
each conformal class, the mass attains a negative minimum. For the minimizing
metric, there is a sharp logarithmic Hardy-Littlewood-Sobolev inequality and a
Moser-Trudinger-Onofri type inequality.Comment: 8 page
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