580 research outputs found
TOPS Imaging with TerraSAR-X: Mode Design and Performance Analysis
No full textThis paper reports about the performed investigations for the implementation of the wide swath TOPS imaging mode with TerraSAR-X. The TOPS mode overcomes the limitations imposed by the ScanSAR mode by steering the antenna along-track during the acquisition of a burst. In this way, a uniform signal to noise ratio (SNR) is achieved, and consequently, scalloping and an azimuth-dependent distributed target ambiguity ratio (DTAR) are avoided. However, the use of electronically steered antennas leads to a quantization of the steering law and a non-ideal pattern for squinted angles (grating lobes and main lobe reduction). The former provokes spurious peaks, while the latter introduces a slight scalloping and DTAR deterioration. These effects are analyzed and quantified for TerraSAR-X and a TOPS system design approach is presented. Next, the requirements concerning interferometry are investigated. Finally, several results are shown with TerraSAR-X data, including a comparison between the TOPS and ScanSAR modes and the reporting of first TOPS interferometric results
Killing potato tops with chemicals in Oregon
No full textTitle from PDF caption (viewed on December 7, 2017).This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
A 115.1 TOPS/W, 12.1 TOPS/mm<sup>2</sup>Computation-in-Memory using Ring-Oscillator based ADC for Edge AI
No full textAnalog computation-in-memory (CIM) architecture alleviates massive data movement between the memory and the processor, thus promising great prospects to accelerate certain computational tasks in an energy-efficient manner. However, data converters involved in these architectures typically achieve the required computing accuracy at the expense of high area and energy footprint which can potentially determine CIM candidacy for low-power and compact edge-AI devices. In this work, we present a memory-periphery co-design to perform accurate A/D conversions of analog matrix-vector-multiplication (MVM) outputs. Here, we introduce a scheme where select-lines and bit-lines in the memory are virtually fixed to improve conversion accuracy and aid a ring-oscillator-based A/D conversion, equipped with component sharing and inter-matching of the reference blocks. In addition, we deploy a self-timed technique to further ensure high robustness addressing global design and cycle-to-cycle variations. Based on measurement results of a 4Kb CIM chip prototype equipped with TSMC 40nm, a relative accuracy of up to 99.71% is achieved with an energy efficiency of 115.1 TOPS/W and computational density of 12.1 TOPS/mm2 for the MNIST dataset. Thus, an improvement of up to 11.3X and 7.5X compared to the state-of-the-art, respectively.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Computer EngineeringElectrical Engineering, Mathematics and Computer ScienceQuantum & Computer Engineerin
Enabling the Processing of Sentinel-1 TOPS Data with the Open-Source DORIS Software (PPT)
No full textPart of Session 3 - Sentinel-1 TOPS InSAR resultsMathematical Geodesy and Positionin
Bulletin No. 227 - Sugar Beet Tops, Cottonseed Cake, and Mono-Calcium Phosphate in Rations for Steers
No full textBulletin No. 227 - Sugar Beet Tops, Cottonseed Cake, and Mono-Calcium Phosphate in Rations for Steer
View from Wooly Tops
No full textThis photograph looking eastward from Wooly Tops is included in the records of the Smoky Mountains Hiking Club, formed after a group of outdoor enthusiasts hiked up to Mount LeConte in October 1924. The image was made by hiking club member, Walter Berry. Also penciled in on the back of the photograph is “C.C. Campbell,” referring to Carlos C. Campbell (1892-1978), a founding member of the Great Smoky Mountains Conservation Association and author of “Birth of a National Park.
Chimney Tops from Bear Pen Hollow
No full textThis photograph of Chimney Tops is taken from Bear Pen Hollow with hikers standing beside the Newfound Gap Highway. This picture was made by Carlos C. Campbell (1892-1978), a founding member of the Great Smoky Mountains Conservation Association and author of “Birth of a National Park,” published in 1960. This photograph, with others in this series, are included in the records of the Smoky Mountains Hiking Club, formed after a group of outdoor enthusiasts hiked up to Mount LeConte in October 1924
ON THE SELECTION RULES OF TORSION VIBRATIONS OF TOPS MOLECULES
No full textAuthor Institution: U S A S R D L., Fort Monmouth, New Jersey.The selection rules for torsion vibrations of molecules having two or three symmetrically arranged () tops have been analyzed by using group theoretical methods. The selection rules were established by using a symmetry group that contains the symmetry elements of the tops as well as the point group elements of the whole molecule. This analysis predicted infrared allowed transitions which should be forbidden according to the common treatment of the torsion vibration problem. In particular, for two tops molecules having and three tops molecules having point group symmetry, the transition between the ground and the first exited torsional state consist of two instead of one infrared active transition
Complex phonological tasks predict reading in 7 to 11 years of age typically developing Russian children
No full textBackground The important role of phonological processing for reading has been demonstrated by many studies. The purpose of this research was to investigate the role of phonological processing for reading in Russian. Specifically, we tested whether the overall complexity of a phonological task predicts reading fluency and reading comprehension. Method We used seven phonological tests ranked according to the number of linguistic processes involved in each task. We examined the relative difficulty of the tests and the relationship between phonological processing and reading skills (reading fluency and comprehension of simpler and more difficult texts) in 90 typically developing 7 to 11 years-of-age Russian-speaking children. Results Phonological tests that involved more linguistic processes had lower response accuracies. At the individual level, a greater estimated cost of adding a linguistic process to a phonological test was associated with a reliable decrease in reading fluency but not reading comprehension. Conclusions Our findings confirmed the substantial role of phonological processing in reading acquisition while stressing a higher predictive value of more complex phonological tests for reading fluency. The relationship between phonological processing and reading comprehension, in Russian, needs further investigations.This study was performed with financial support from the Russian Foundation for Basic Research, Project No. 17-29-09122. The contribution of Victoria Reshetnikova and Wim Tops was funded by the Center for Language and Brain NRU Higher School of Economics, RF Government Grant, ag. No. 14.641.31.0004.Dorofeeva, SV (corresponding author), Natl Res Univ Higher Sch Econ, Ctr Language & Brain, Moscow, Russia.
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TOPS: Technology Options for Coupled Underground Coal Gasification and CO2 Capture and Storage
No full textThe TOPS project takes a radical and holistic approach to coupled UCG-CCS, and thus the site selection criteria for the coupled processes, considering both geological, reservoir and process engineering aspects and different end-uses of the produced synthetic gas in order to optimise the whole value chain. In particular, the experimental research carried out utilises a newly constructed high pressure gasification reactor investigating several prospective options of UCG technology implementations. Integrated research addresses field based technology knowledge gaps, such as cavity progression and geomechanics, potential groundwater contamination and subsidence impacts, together with research into process engineering solutions in order to assess the role/impact of site specific factors and selected reagents on the operability of given CO2 emission mitigation options. Ultimately, research aims to minimise the need for on-site CO2 storage capacity as well as maximising the economic yield of UCG through value added end products.Geoscience & EngineeringCivil Engineering and Geoscience
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