The study of space debris is of critical importance to all space-faring nations. The characterization of debris objects through means of passive imaging techniques would allow for further studies into the origination, specifications, and future trajectory of debris objects. The long-wave infrared waveband is a potential candidate for the observation of space debris. However, in order to simulat...

Reliable detection of non-traversable hazards is a key requirement for off-road autonomous navigation. Under the Army Research Laboratory (ARL) Collaborative Technology Alliances (CTA) program, JPL has evaluated the performance of seven obstacle detection algorithms on a General Dynamics Robotic Systems (GDRS) surveyed obstacle course containing 21 obstacles. Stereo imagery was collected from a...

Gravitational wave detectors aim to detect strain perturbations of space-time on the order of 10−21–10−22 at frequencies between 1 Hz and a few kHz. This space-time strain, integrated over kilometer scale interferometers, will induce movements of suspended mirrors on the order of 10−18–10−19 m. Seismic motion in this frequency band varies between 10−6 m and 10−12 m. Required seismic attenuation...

A rapidly growing United States data base consisting of over 90,000 indoor radon concentrations measured with passive integrating Track Etch detectors is described. The data base is subdivided by region and state, and a variety of s t a t i s t i c a l parameters summarizing the contents of the data base are presented for each geographical area. The primary conclusions that can be drawn are tha...

We propose using optomechanical interaction to narrow the bandwidth of filter cavities for achieving frequency-dependent squeezing in advanced gravitational-wave detectors, inspired by the idea of optomechanically induced transparency. This can allow us to achieve a cavity bandwidth on the order of 100 Hz using small-scale cavities. Additionally, in contrast to a passive Fabry-Pérot cavity, the...

Variations in appearance can detrimentally impact the accuracy of object detectors leading to an unacceptably high rate of missed detections. We propose an incremental retraining method that combines a self-training strategy with an uncertainty-based model for active learning. This enables us to augment an existing training set with selectively-labeled instances from a larger pool of examples t...

In this section we give various parameters for common detector components. The quoted numbers are usually based on typical devices, and should be regarded only as rough approximations for new designs. More detailed discussions of detectors and their underlying physics can be found in books by Ferbel [1], Grupen [2], Kleinknecht [3], Knoll [4], and Green [5]. In Table 28.1 are given typical reso...

The idea of passive euthanasia has recently been attacked in a particularly clear and explicit way by an ‘‘Ethics Task Force’’ established by the European Association of Palliative Care (EAPC) in February 2001. It claims that the expression ‘‘passive euthanasia’’ is a contradiction in terms and hence that there can be no such thing. This paper critically assesses the main arguments for the Task...

Integrated optics and Optical computing are now a mature technology offering many types of devices and manufacturing techniques. Recent breakthroughs in the field of silicon photonics showed low-loss insulators, passive wave guide devices, high speed optical switches, detectors, silicon lasers, and silicon amplifiers, optical amplifiers etc. These devices have provided the possibility to constr...

Whether cortical neurons act as coincidence detectors or temporal integrators has implications for the way in which the cortex encodes information--by average firing rate or by precise timing of action potentials. In this study, we examine temporal coding by a simple passive-membrane model neuron responding to a full spectrum of multisynaptic input patterns, from highly coincident to temporally...