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M.Evans - LIGO
M.Evans - LIGO

... isolation system on moving ground, suspension, sensors and actuators » feedback loops : length and alignment controls, feedback to laser ...
G1200687-v1 - LIGO Scientific Collaboration
G1200687-v1 - LIGO Scientific Collaboration

... We present the status of ground based gravitational wave detectors. All observatories are currently in the process of installing second generation instruments with the intend to introduce the era of detection. The regular observations of sources will require a worldwide network of detectors for reli ...
Optimizing Probabilistic Query Processing on Continuous
Optimizing Probabilistic Query Processing on Continuous

... using a suite of new techniques grounded in statistical theory and a new design of the query optimizer. Our contributions include: Selections (§3): Selections with complex predicates on continuous uncertain data often involve high-dimensional integrals such as with Q1 and Q2. In this work, we propo ...
Noise reduction applied to asteroseismology
Noise reduction applied to asteroseismology

... • Photon-shot noise due to statistical fluctuations in the measurements has a Poisson distribution and a power increasing with frequency. It is a problem with weak signals. • Also seismic noise affect to sensible ground instruments like LIGO (gravitational wave detector). Nevertheless, for LISA the ...
Searching for GW with LIGO
Searching for GW with LIGO

... Future detectors will require much further development • Squeezed light, entanglement, macroscopic quantum mechanical techniques • Unconventional optics: gratings, cryogenic optics, new shapes • New materials for substrates and coatings • New interferometer configurations • Lasers: higher power, gre ...
Large Dynamic Range Dynamically Biased Log-Domain
Large Dynamic Range Dynamically Biased Log-Domain

... the filter over a wide range of input currents are presented. With suitable dynamic biasing, the fabricated filter can maintain a THD < 40 dB and S/N > 53.7 dB for differential input current amplitudes ranging from 3 µA to 2.5 mA (a range of 58.4 dB). In terms of the range of signals that can be han ...
the ˆg search for extraterrestrial civilizations with large energy
the ˆg search for extraterrestrial civilizations with large energy

... independently by other transiting objects or other methods, such as asteroseismology). Kipping identified six effects that would create such a discrepancy: orbital eccentricity, blends with other stars, starspots, dynamically generated transit timing variations (TTVs), transit duration variations (T ...
Cross-bispectra and trispectra of the non
Cross-bispectra and trispectra of the non

... With these two functions, the connected perturbation theory fourpoint function up to third order in the linear power spectrum PL (k) can be expressed by the following two tree-level contributions, Tδ k1 ,k2 ,k3 ,k4 = t (2) ((k1 , k2 ), (k3 , k4 )) + all pairs ∈ {1, 2, 3, 4} + t (3) (k1 , k2 , k3 , k ...
Planetary detection limits taking into account stellar noise
Planetary detection limits taking into account stellar noise

... In the raw VPSD of all the stars, except α Cen B, we note a substantial excess of power at 3.1, 6.2, and 9.3 mHz (see Fig. 1, top panel). It has been shown that these anomalies are due to a problem in the guiding engine of the telescope, resulting in poor guiding precision (e.g. Teixeira et al. 2009 ...
Flux Calibration of the ACS CCD Cameras SPACE TELESCOPE SCIENCE
Flux Calibration of the ACS CCD Cameras SPACE TELESCOPE SCIENCE

... The calibration of the ACS filter complement is based on the observations of spectrophotometric standards and the application of synthetic photometry techniques (De Marchi et al. 2004, DeM; Sirianni et al. 2005, S05, Bohlin 2007a, B07). The transmission of the filters, the throughput of the optics, ...
Radiometer
Radiometer

... cryogenic termination. The radiometer output and termination temperature are monitored when the termination is at equilibrium (about 6 K). The termination is then heated to approximately 15 K Because of the low ambient temperature, the heat capacity of the termination is small, and the physical temp ...
The Search for Directed Intelligence
The Search for Directed Intelligence

... the analog of phased array radar that is becoming more common. An analogous revolution is taking place in visible and near IR coherent systems allowing for free space beam combining with no upper limit to power. This is very much analogous to the revolution in computing that has been brought about b ...
Thermal lensing in Virgo and Polynomial Search: an all-sky
Thermal lensing in Virgo and Polynomial Search: an all-sky

... schematic of the inspiral waveform (courtesy of [7]). ...
Quantum Enhanced Gravitational Wave Detector
Quantum Enhanced Gravitational Wave Detector

... optimized for shot optimized for shot  noise limited  interferomter,   maximum pump  power 80% of  threshold ...
Timing Resolution Performance Comparison for Fast and
Timing Resolution Performance Comparison for Fast and

... a SiPM device with 3×3 mm2 sensitive area, the single photo electron response from the fast output is less than 2 ns wide compared with 50 ns width observed at the standard output. Using the fast readout signal, a coincidence resolving time (CRT) of 190 ps (FWHM - full width at half maximum) was mea ...
The Search for Directed Intelligence
The Search for Directed Intelligence

... being sought out[1,2,3]. A number of searches have looked for optical signatures, though few were able to be done systematically due to practical and funding limitations [4-13]. We will assume that the civilizations we are seeking have directed energy capability to equals or exceed our currently and ...
On the Properties and Topology of the Cosmic Web Environments
On the Properties and Topology of the Cosmic Web Environments

... The NEXUS+ algorithm 1. Apply a filter to the input field. 2. Compute the Hessian of the filtered field f. 3. Use the Hessian eigenvalues to assign an environment signature to each point. 4. Repeat steps 1-3 for a range of filter scales. 5. Combine the environmental signatures of each scale to get a ...
G030139-00 - DCC
G030139-00 - DCC

... Graphic by R. Dupuis, Glasgow ...
Le PHARE
Le PHARE

... where prog-name is the name of the program, followed by a configuration file called with -c configurationfile and a list of parameters. Any -Parameter value statement in the command-line overrides the values written in the configuration file. The part enclosed within brackets is optional, if not spe ...
Discussion about Noise Equivalent Power and its use for photon
Discussion about Noise Equivalent Power and its use for photon

... Contrary of what could be thought regarding the wide use of the Noise Equivalent Power in literature to characterize the measurements limits of detectors, it is not easy to find a clear mathematical definition of the NEP in the literature! The first definition given here comes from the Federal Stand ...
Sample manuscript showing specifications and style
Sample manuscript showing specifications and style

... The CIS 107 device was tested in the cryogenic dewar with TP-14 Polycold Compact Cooler. The device can be cooled from room temperature to 160K through a cold plate on top of the ceramic package. The temperature was monitored with a temperature sensor mounted on the ceramic package and also another ...
"Characterization of 3D-integrated Active Pixel Sensor for X-ray Detection."
"Characterization of 3D-integrated Active Pixel Sensor for X-ray Detection."

... valid in our sensor. X-ray detection is a direct and precise way to study interpixel interaction, because in this case, a known quantity of signal charge is instantaneously deposited in a pixel. The reactions of that pixel and the adjacent ones to this stimulus can provide the desired parameters. To ...
Amplitude and intensity interferometry using satellite LNB receivers
Amplitude and intensity interferometry using satellite LNB receivers

... Figure 4: Disconnection of the LNB internal local oscillators and injection of the external 10 GHz oscillator A further requirement for interferometry is for the sampling of the data on the two channels to be synchronous, and this is achieved using a National Instrument USB 5133 ADC. It samples on t ...
Full Text, PDF - Superconductivity News Forum
Full Text, PDF - Superconductivity News Forum

... device normal resistance, RN, was 55 Ohm and the residual resistance was much less than 1 Ohm. The critical current is very pronounced below TC (≈ 330 mK) but quickly collapses as the temperature increases by a few mK. Because of the dc stability condition dV/dI > RL (RL is the load resistance), i ...
Slow Light with Integrated Gain and Large Pulse Delay
Slow Light with Integrated Gain and Large Pulse Delay

... offset each other [16], such that the delay-bandwidth product for EIT-based slow light (g EIT ) is independent of the control field intensity, jC j2 , but proportional to the optical depth. Therefore, a larger delay-bandwidth product requires a larger optical depth, which comes at the expense of ...
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Matched filter

In signal processing, a matched filter (originally known as a North filter) is obtained by correlating a known signal, or template, with an unknown signal to detect the presence of the template in the unknown signal. This is equivalent to convolving the unknown signal with a conjugated time-reversed version of the template. The matched filter is the optimal linear filter for maximizing the signal to noise ratio (SNR) in the presence of additive stochastic noise. Matched filters are commonly used in radar, in which a known signal is sent out, and the reflected signal is examined for common elements of the out-going signal. Pulse compression is an example of matched filtering. It is so called because impulse response is matched to input pulse signals. Two-dimensional matched filters are commonly used in image processing, e.g., to improve SNR for X-ray.Matched filtering is a demodulation technique with LTI (Linear Time Invariant) filters to maximize SNR.
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