Feng J.,Scientific Solutions, Inc.
Acta Crystallographica Section A: Foundations of Crystallography | Year: 2012
A new Fourier cycling phasing method is proposed based on the mathematical principle of the global minimization. In reciprocal space, the Fourier coefficient is of a mixed form of the normalized structure factors (2E o 2 - E c 2)E c, while in direct space the Fourier map is modified with a peak-picking procedure. This method does not use any preliminary information and does not rely on any critical parameter; it can start with either randomly assigned phases or fixed phases (all zeros). This method performs significantly better than the commonly used forms of Fourier cycling. © 2012 International Union of Crystallography. Source
Feng J.,Scientific Solutions, Inc.
Journal of Applied Crystallography | Year: 2011
A method is proposed for the initial identification of non-hydrogen atomic species in a crystal from X-ray diffraction intensities when the chemical composition is not available. When atom positions are determined, a portion of the scattering factor curve for each atom can be obtained by Fourier synthesis with reflections from concentric shells. From these curves, the atomic number and the isotropic displacement parameter for all non-H atoms, and the scaling constant of the structure factors, can be approximately determined. © 2011 International Union of Crystallography Printed in Singapore - all rights reserved. Source
Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase I | Award Amount: 80.00K | Year: 2010
Based on its extensive experience designing, building, testing, and operating the High Frequency Marine Mammal Mitigation Sonar (HF/M3), the Integrated Marine Mammal Monitoring and Protection System (IMAPS), and the Swimmer Detection Sonar Network (SDSN), Scientific Solutions, Inc. proposes to develop a simple, compact, and low power active sonar for short-range detection, localization, and tracking of marine mammals. The requirement is for all the electronics and processing to integrate with an AN/SSQ-125 (A-size) sonobuoy. Preliminary analysis shows that a low source level of 173 dB re µPa2 @ 1 m should be possible while still achieving a range of 300 m and a bearing accuracy on the order of 10 degrees. The approached to be used is that of the SDSN system, simple fixed beams vice the use of a complex phased array system. The fine-bearing algorithm developed and proven for the SDSN will be used to determine bearing. In Phase 1 the feasibility of implementing the sonar will be assessed including integration with the AN/SSQ-125 source buoy. In Phase 2 a prototype of the mitigation sonar will be developed and tested at NUWC’s Lake Seneca test facility, using simulated marine mammal targets that SSI has already developed and tested.
Scientific Solutions, Inc. | Date: 2014-09-05
Disclosed is an ultrasonic IRIS inspection system and a method of providing automatically compensated concentric B-scans by means of curve-fitting the unadjusted tube boundaries from inspection data, and from the curve fitted theoretical circle, using non-linear regression analysis to determine an adjusted center. The off-center distance between the adjust center and the misaligned center is then used to produce concentric inspection result by compensating the unadjusted inspection result with the off-center distance.
Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase I | Award Amount: 99.83K | Year: 2010
This proposal describes the Space Plug-and-Play Spectrometer (SPNPS), a spectrometer built in support of the development of rapid-response CubeSat payloads. The goal is to have payloads which can be made to order in days or even hours, through the use of Space Plug-and-Play Avionics (SPA). The SPNPS instrument augments that goal by providing a spectrometer as plug-and-play as any electronic or mechanical component, a spectrometer which can be snapped into place and interchanged with other equivalent-size spectrometers at various wavelengths nearly as efficiently as changing boards in a computer. The spectrometer chosen for this development is the monolithic Spatial Heterodyne Spectrometer, a Fourier transform interferometer requiring no moving parts, and no alignment beyond its initial laboratory assembly. A stock of monolithic SHS units for various wavelengths will be constructed, able to be pulled off the shelf at a moment''s notice, clamped, and inserted in the prospective CubeSat payload. The SPNPS is proposed for rocket exhaust plume detection, but has myriad potential uses. BENEFIT: Small size and low operating power enable the SPNPS “SpinUps” sensor to fly on any spacecraft from the smallest (CubeSat) to the largest. Because SPNPS is a relatively simple instrument, it could obtain useful data from almost any Low Earth Orbit (LEO) mission, ranging from three-axis stabilized to spinning. This versatility makes it attractive to a number of different agencies with different missions and needs, including the US Air Force (the Defense Meteorological Satellite Program), The US Navy (the Colony-I concept), NASA and NSF. The potential for CubeSat fleets and robust SPNPS units to be included on Solar System survey missions, and Mission to Planet Earth, is immense. And the NSF has recently begun CubeSat programs of its own. The SPNPS would also have use outside CubeSats, for any satellites seeking lightweight, felxible, directly constructed systems. In the private sector, three top-tier markets for SPNPS application are: (1) oil and gas exploration, (2) mineral exploration, and (3) agriculture. These markets have been selected based on relative application maturity, potential market size, and the number of existing users of multi-spectral imaging in these markets likely to expand their capabilities. Potential partners include Headwall photonics, and Telops.