366 research outputs found
High Performance Steel For Highway Bridges
All steels possess a combination of properties that determines how well steel performs. Strength, weldability, toughness, ductility, corrosion resistance, and formability are all important to determine how well steel performs. High-performance steel (HPS) can be defined as having an optimized balance of these properties to give maximum performance in bridge structures while remaining cost-effective
Direct measurement of the fine-structure interval in alkali atoms using diode lasers
We demonstrate a technique for directly measuring the fine-structure interval
in alkali atoms using two frequency-stabilized diode lasers. Each laser has a
linewidth of order 1 MHz and precise tunability: one laser is tuned to a
hyperfine transition in the D_1 line, and the other laser to a hyperfine
transition in the D_2 line. The outputs of the lasers are fed into a scanning
Michelson interferometer that measures the ratio of their wavelengths
accurately. To illustrate the technique, we measure the fine-structure interval
in Rb, and obtain a value of 237.6000(3)(5) cm^-1 for the hyperfine-free
5P_{3/2} - 5P_{1/2} interval.Comment: 3 pages, 2 figures, to be published in Applied Physics Letters, 20
May 2002 editio
High-accuracy wavemeter based on a stabilized diode laser
We have built a high-accuracy wavelength meter for tunable lasers using a
scanning Michelson interferometer and a reference laser of known wavelength.
The reference laser is a frequency stabilized diode laser locked to an atomic
transition in Rb. The wavemeter has a statistical error per measurement of 5
parts in which can be reduced considerably by averaging. Using a second
stabilized diode laser, we have verified that systematic errors are below 4
parts in .Comment: 3 pages, 2 figure
Observation of persistent flow of a Bose-Einstein condensate in a toroidal trap
We have observed the persistent flow of Bose-condensed atoms in a toroidal
trap. The flow persists without decay for up to 10 s, limited only by
experimental factors such as drift and trap lifetime. The quantized rotation
was initiated by transferring one unit, , of the orbital angular
momentum from Laguerre-Gaussian photons to each atom. Stable flow was only
possible when the trap was multiply-connected, and was observed with a BEC
fraction as small as 15%. We also created flow with two units of angular
momentum, and observed its splitting into two singly-charged vortices when the
trap geometry was changed from multiply- to simply-connected.Comment: 1 file, 5 figure
Valuation and Return Dynamics of New Ventures
We develop and analyze a model of a multi-stage investment project that captures many features of R&D ventures and start-up companies. An important feature these problems share is that the firm learns about the potential profitability of the project throughout its life, but that research and development effort itself is only resolved through additional investment by the firm. In addition, the risks associated with the ultimate cash flows the firm realizes on completion of the project have a systematic component, while the purely technical risks are idiosyncratic. Our model captures these different sources of risk, and allows us to study their interaction in determining the risk premia earned by the venture during development. Our results show that the systematic risk, and the required risk premium, of the venture are highest early in its life, and decrease as it approaches completion, despite the idiosyncratic nature of the technical risk.
A CCA2 secure Code based encryption scheme in the Standard Model
This paper proposes an encryption scheme secureagainst chosen cipher text attack, built on the Niederreiterencryption scheme. The security of the scheme is based on thehardness of the Syndrome Decoding problem and the Goppa CodeDistinguishability problem. The scheme uses the techniques providedby Peikert and Waters using the lossy trapdoor functions.Compared to the existing IND-CCA2 secure variants in standardmodel due to Dowsley et.al. and Freeman et. al. (using the repetition paradigm initiated by Rosen and Segev), this schemeis more efficient as it avoids repetitions
Valuation and Return Dynamics of New Ventures.
We develop and analyze a model of a multi-stage investment project that captures many features of R&D; ventures and start-up companies. An important feature these problems share is that the firm learns about the potential profitability of the project throughout its life, but that "technical uncertainty" about the research and development effort itself is only resolved through additional investment by the firm. In addition, the risks associated with the ultimate cash flows the firm realizes on completion of the project have a systematic component, while the purely technical risks are idiosyncratic. Our model captures these different sources of risk, and allows us to study their interaction in determining the risk premia earned by the venture during development. Our results show that the systematic risk, and the required risk premium, of the venture are highest early in its life, and decrease as it approaches completion, despite the idiosyncratic nature of the technical risk.
A case report on a rare presentation of Aeromonas hydrophila
The genus Aeromonas is a member of the family Vibrionaceae. Aeromonas hydrophila is a water-dwelling, gram-negative rod-shaped bacterium, associated with diarrheal illness and less commonly, bone and soft tissue infections, especially among immunocompromised patients. Here we reported a rare presentation of A. hydrophila causing septicemia, septic arthritis, and osteomyelitis in an immunocompetent patient. A 35-year-old female, known hypothyroidism, presented with low back pain for one and half months and left side hip pain radiating to the left lower limb for one month. While in the hospital, she subsequently developed overwhelming sepsis secondary to septic arthritis and osteomyelitis. Which was secondary to a multidrug-resistant strain of A. hydrophila. Despite broad-spectrum antibiotics and aggressive surgical management, she had a recurrence of the infection. Aeromonas species infection in both immunocompetent and immunocompromised patients may result in high morbidity and mortality. This organism is highly virulent and multidrug-resistant. So early diagnosis and early administration of antibiotics would give better outcomes
Sub-natural linewidth in room-temperature Rb vapor using a control laser
We demonstrate two ways of obtaining sub-natural linewidth for probe
absorption through room-temperature Rb vapor. Both techniques use a control
laser that drives the transition from a different ground state. The coherent
drive splits the excited state into two dressed states (Autler-Townes doublet),
which have asymmetric linewidths when the control laser is detuned from
resonance. In the first technique, the laser has a large detuning of 1.18 GHz
to reduce the linewidth to 5.1 MHz from the Doppler width of 560 MHz. In the
second technique, we use a counter-propagating pump beam to eliminate the
first-order Doppler effect. The unperturbed probe linewidth is about 13 MHz,
which is reduced below 3 MHz (0.5 \Gamma) at a detuning of 11.5 MHz.Comment: 4 pages, 7 figure
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