United States of America as Represented by the Administrator of Nasa

Yijiang Lu

Jing Li

Meyya Meyyappan

Richard T Wilkins

James J Hanratty

System and method for monitoring receipt and estimating flux value, in real time, of incident radiation, using two or more nanostructures (NSs) and associated terminals to provide closed electrical paths and to measure one or more electrical property change values &#x394;EPV, associated with irradiated NSs, during a sequence of irradiation time intervals. Effects of irradiation, without healing and with healing, of the NSs, are separately modeled for first order and second order healing. Change values &#x394;EPV are related to flux, to cumulative dose received by NSs, and to radiation and healing effectivity parameters and/or &#x3bc;, associated with the NS material and to the flux. Flux and/or dose are estimated in real time, based on EPV change values, using measured &#x394;EPV values. Threshold dose for specified changes of biological origin (usually undesired) can be estimated. Effects of time-dependent radiation flux are analyzed in pre-healing and healing regimes.

Real time radiation monitoring using nanotechnology

Methods and systems for determining if one or more target molecules are present in a gas, by exposing a functionalized carbon nanostructure (CNS) to the gas and measuring an electrical parameter value EPV(n) associated with each of N CNS sub-arrays. In a first embodiment, a most-probable concentration value C(opt) is estimated, and an error value, depending upon differences between the measured values EPV(n) and corresponding values EPV(n;C(opt)) is computed. If the error value is less than a first error threshold value, the system interprets this as indicating that the target molecule is present in a concentration C&#x2248;C(opt). A second embodiment uses extensive statistical and vector space analysis to estimate target molecule concentration.

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San Jose, CA, United States of America

Yijiang Lu