15,358 research outputs found
Condition and condition duration indicator Patent
Electric network for monitoring temperatures, detecting critical temperatures, and indicating critical time duratio
Seismic displacement transducer Patent
Determining sway of buildings by low frequency device using pendulu
Device calibrates vibration transducer at amplitudes up to 20 g
A piezoelectric transducer provides accurate calibration of vibration amplitudes to 20 g. The calibration system uses an electromagnetically driven resonant beam to generate mechanical vibrations at a fixed frequency
Improved manual radio frequency direction finder
Antenna loop direction finder, consisting of two separate loops mounted rigidly together at right angles to each other, requires single rotation for operation. The loops, one for bearing, the other for sensing, are rotated manually. Sensing loop, in conjunction with nondirectional antenna, produces signal with directional pattern
An alternative construction of the positive inner product for pseudo-Hermitian Hamiltonians: Examples
This paper builds on our earlier proposal for construction of a positive
inner product for pseudo-Hermitian Hamiltonians and we give several examples to
clarify our method. We show through the example of the harmonic oscillator how
our construction applies equally well to Hermitian Hamiltonians which form a
subset of pseudo-Hermitian systems. For finite dimensional pseudo-Hermitian
matrix Hamiltonians we construct the positive inner product (in the case of
matrices for both real as well as complex eigenvalues). When the
quantum mechanical system cannot be diagonalized exactly, our construction can
be carried out perturbatively and we develop the general formalism for such a
perturbative calculation systematically (for real eigenvalues). We illustrate
how this general formalism works out in practice by calculating the inner
product for a couple of symmetric quantum mechanical theories.Comment: 9 pages, revte
Shuttle system ascent aerodynamic and plume heating
The shuttle program provided a challenge to the aerothermodynamicist due to the complexity of the flow field around the vehicle during ascent, since the configuration causes multiple shock interactions between the elements. Wind tunnel tests provided data for the prediction of the ascent design heating environment which involves both plume and aerodynamic heating phenomena. The approach for the heating methodology based on ground test firings and the use of the wind tunnel data to formulate the math models is discussed
Thermoset-thermoplastic aromatic polyamide containing N-propargyl groups
The compounds of the class of aromatic polyamides useful as matrix resins in the manufacture of composites or laminate fabrication were developed. The process for preparing this thermoplastic-thermoset polyamide system involves incorporating a latent crosslinking moiety along the backbone of the polyamide to improve the temperature range of fabrication thereof wherein the resin softens at a relatively low temperature (approx. 154 C) and subsequently sets-up or undergoes crosslinking when subjected to higher temperature (approx. 280 C)
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