Hadamard matrices of order 20

Three classes for Hadamard matrices of order 2

Apparatus for measuring electric field strength on the surface of a model vehicle Patent

Space environment simulation system for measuring spacecraft electric field strength in plasma sheat

Extremal curves in nilpotent Lie groups

We classify extremal curves in free nilpotent Lie groups. The classification is obtained via an explicit integration of the adjoint equation in Pontryagin Maximum Principle. It turns out that abnormal extremals are precisely the horizontal curves contained in algebraic varieties of a specific type. We also extend the results to the nonfree case.Comment: 30 pages, final versio

Analytical study of a free-wing/free-trimmer concept

The free-wing/free-trimmer is a NASA-Conceived extension of the free-wing concept intended to permit the use of high-lift flaps. Wing pitching moments are balanced by a smaller, external surface attached by a boom or equivalent structure. The external trimmer is, itself, a miniature free wing, and pitch control of the wing-trimmer assembly is effected through a trailing-edge control tab on the trimmer surface. The longitudinal behavior of representative small free-wing/free-trimmer aircraft was analyzed. Aft-mounted trimmer surfaces are found to be superior to forward trimmers, although the permissible trimmer moment arm is limited, in both cases, by adverse dynamic effects. Aft-trimmer configurations provide excellent gust alleviation and meet fundamental stick-fixed stability criteria while exceeding the lift capabilities of pure free-wing configurations

Sensible heat transfer in the Gemini and Apollo pressure suits

Sensible heat transfer effects in Gemini and Apollo pressure suit

Study and development of acoustic treatment for jet engine tailpipes

A study and development program was accomplished to attenuate turbine noise generated in the JT3D turbofan engine. Analytical studies were used to design an acoustic liner for the tailpipe. Engine ground tests defined the tailpipe environmental factors and laboratory tests were used to support the analytical studies. Furnace-brazed, stainless steel, perforated sheet acoustic liners were designed, fabricated, installed, and ground tested in the tailpipe of a JT3D engine. Test results showed the turbine tones were suppressed below the level of the jet exhaust for most far field polar angles

Gabapentin in the Treatment of Bipolar Disorder

Gabapentin, a relatively new anti-epileptic drug (AED), is emerging as a therapeutic option for treatment refractory and rapid-cycling bipolar illnesses. Pharmacotherapy for bipolar disorders traditionally involves valproate, carbamazapine, or lithium, drugs which are associated with numerous adverse effects. Conversely, gabapentin has an attractive pharmacokinetics profile and relatively few side effects. There are no large randomized controlled clinical trials to date examining gabapentin’s role in mood stabilization. However, informal reports have cited encouraging results in up to 80% of patients and general tolerance to side effects. These findings make the new drug a possible choice for patients who have failed to respond to traditional agents or developed side effects which interfere with medication compliance