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
Rajan S.D.,Scientific Solutions, Inc. |
Becker K.M.,Pennsylvania State University
IEEE Journal of Oceanic Engineering | Year: 2010
A perturbative inversion method for estimating sediment compressional-wave-speed profiles from modal travel-time data is extended to include range-dependent environments. The procedure entails dividing a region into range-independent sections and obtaining estimates of the sediment properties for each region. Inversion results obtained using synthetic data show that range-dependent properties can be obtained if an experiment is designed to include multiple source/receiver combinations. This approach is applied to field data collected during the 2006 Shallow Water Experiment (SW06). The sediment compressional-wave-speed profiles resulting from analysis of the field data are evaluated by comparing acoustic fields predicted based on the inversion to acoustic fields measured during a different experiment conducted in the same region. The model is also compared to seismic reflection survey data collected during SW06. Resolution and variance estimated for the inversion results are also presented. © 2005 IEEE. 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.