70,886 research outputs found

### Gravitational gradiometer measures mass changes

Differential angular accelerometer, utilizing complex geometric configurations and spring-coupled rotating masses, demonstrates feasibility of measuring mass distributions of celestial bodies by detecting spatial gradients of their fields from orbiting vehicles. Applications include mineralogical surveying, geodetic engineering, and solar system investigation

### Voices in the Band: A Doctor, Her Patients, and How the Outlook on AIDS Care Changed from Doomed to Hopeful

[Excerpt] I wanted to write a book about my patients and my colleagues and how we made it through the roller-coaster last decade of the twentieth century, how we moved from helplessly watching our patients die to being able to offer them a treatment course and a fairly normal life expectancy. In that time we saw some patients literally return from deathâ€™s door. This kind of dramatic success has not been seen in any other field of medicine, except perhaps following the introduction of penicillin many years ago. I wanted to try to answer the question â€śWhat was it like?â€ť What was it like to care for patients with AIDS, a disease that didnâ€™t even exist when I was in college? How did we deal with dying patients for whom we had a diagnosis but no treatment? How did we care for patients that many in society rejected, patients that many even within the field of medicine rejected? What happened in those years, when the prognosis for a patient with HIV went from nearly hopeless to very hopeful

### Fiber optic crossbar switch for automatically patching optical signals

A system for automatically optically switching fiber optic data signals between a plurality of input optical fibers and selective ones of a plurality of output fibers is described. The system includes optical detectors which are connected to each of the input fibers for converting the optic data signals appearing at the respective input fibers to an RF signal. A plurality of RF to optical signal converters are arranged in rows and columns. The output of each of the optical detectors are each applied to a respective row of optical signal converted for being converters back to an optical signal when the particular optical signal converter is selectively activated by a dc voltage

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