The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We compare water-vapor absorption models generated with HITRAN Online and HITEMP2010 to measurements with a dual-comb spectrometer. For strong lines up to 1300K, HITRAN Online is a more accurate predictor of strengths, shapes, and positions.
Near-infrared frequency-comb spectroscopy is a powerful tool with which to measure absorption of CO2, CH4, H2O over turbulent paths such as meter scale paths in active furnaces or 11 km horizontal paths over cities. Work of the U.S. government, not subject to copyright.
We demonstrate wavelength modulation spectroscopy of CO2 at >30 atm using a fast-scanning MEMS laser. The technique shows promise for sensitive measurements of species with broadband absorption features, such as high-pressure gases and large molecules.
We demonstrate an AO-OFDM system with a WSS-based transmitter and time-lens based receiver for spectral magnification, achieving BER∼10−9 for a 28×10 Gbit/s DPSK AO-OFDM signal. Furthermore, the receiver performance for DPSK and DQPSK is investigated using Monte Carlo simulations.
A new meander open complementary split ring resonator (MOCSRR) particle was presented in this paper. The resonant frequency for the particle was 26.5 % lower than an OCSRR particle with the same overall dimensions. The resonant frequency was determined by simulating a CPW test structure in Momentum, modeling the MOCSRR particle with an equivalent circuit and measurements. Good agreement was observed...
Typical thin-film photovoltaic cells incorporate a textured transparent conductive oxide to efficiently harvest solar energy. What should be the ideally desired morphology of this textured surface for best cell performance - is highly debated but remains an unsolved mystery. We present a comprehensive methodology to 1) accurately model, 2) extract macroscopically sufficient statistical finger-prints...
The system performance of an antibody-functionalized microchamber array, developed for selectively binding target cancer cells, is quantitatively characterized. The devices are designed to allow accurate counting of loaded and captured cells from heterogeneous suspensions. Specific interaction between cancer cell receptors and immobilized surface ligands has been demonstrated under static conditions...
The effect of flow acceleration, rather than just the flow rate, on the response of an attached cancer cell is for the first time reported. Selective binding of prostate cancer cells to a surface functionalized with anti-N-cadherin antibodies utilizing a microfluidic system under flow conditions has been studied. Here, the behavior of a captured cell under a time-dependent flow field is investigated...
We introduce Renyi Entropy in this paper and review the basic associated properties that differentiate Renyi Entropy from Shannon Entropy. Theoretic and simulation examples are used to illustrate the differences between the two entropies. We suggest several potential applications of Renyi Entropy to such areas as spectral estimation and pattern recognition.
In this paper we propose a hybrid localization system combining an Ultra-Wideband localization system with inertial sensors. Algorithms for dead reckoning as well as the fusion of data provided by the UWB system and the inertial sensors are presented. Finally experimental results are shown.
We show in this paper that first order aliased spectra, from sampling a band limited low pass random process at an average Nyquist rate, may be eliminated. Our approach is to use two arbitrarily closely spaced samples each sampling instant. A convergence proof is given for the random waveforms. Matlab simulations demonstrate reconstruction of a random waveform with low pass characteristics.
In this paper we present a combined angle-of-arrival and time-of-arrival localization scheme, based on two-way range estimation as defined in IEEE 802.15.4a and additional angle estimation, using two closely spaced receiving antennas. Practical measurement results are presented, showing the potential of combined AOA/TOA localization.
In this paper, we observe simultaneously three different FWM processes involving various types of phase-matching due to the dispersion properties of a new 3.1 km-long dispersion shifted fiber. The fiber has a zero-dispersion wavelength (ZDW) of 1549 nm and is pumped by a 1.3 W continuous-wave (CW) Raman fiber laser (RFL) as well as a 500 mW CW erbium-doped fiber laser (EDFL). The EDFL is tunable across...
Non Line of Sight (NLOS) channels are one of the major drawbacks for accurate ranging and localization with Ultra-Wideband (UWB) technology. Whereas several proposals exist to detect these situations, a comprehensive overview, investigation and testing of these methods has to the authors' knowledge not yet been prepared. This paper tries to fill this gap with a classification of the algorithms proposed...
At JPL, a <5 kg free-flying micro-inspector spacecraft is being designed for host-vehicle inspection. The spacecraft includes a hazard avoidance sensor to navigate relative to the vehicle being inspected. Structured light was selected for hazard avoidance because of its low mass and cost. Structured light is a method of remote sensing 3-dimensional structure of the proximity utilizing a laser,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.