15,171 research outputs found
Analyse des signaux multicomposante à modulation de fréquence linéaire par la transformation de Teager-Huang-Hough
Full text linkA novel detection approach of linear FM (LFM) signals, with single or multiple components, in the time-frequency plane of Teager-Huang (TH) transform is presented. The detection scheme that combines TH transform and Hough transform is referred to as Teager-Huang-Hough (THH) transform. The input signal is mapped into the time-frequency plane by using TH transform followed by the application of Hough transform to recognize time-frequency components. LFM components are detected and their parameters are estimated from peaks and their locations in the Hough space. Advantages of THH transform over Hough transform of Wigner-Ville distribution (WVD) are: 1) cross-terms free detection and estimation, and 2) good time and frequency resolutions. No assumptions are made about the number of components of the LFM signals and their models. THH transform is illustrated on multicomponent LFM signals in free and noisy environments and the results compared with WVD-Hough and pseudo-WVD-Hough transforms
Small bowel volvulus caused by re-implantation and growth of remnant tissue from a previously excised ovarian mucinous cystadenoma.
No full textReduced N-methyl-pyridylethynyl porphyrins exhibit strong near-IR absorptions
No full text[[abstract]]Porphines bearing two N-methyl-4-pyridylethynyl substituent reversibly undergo two one-electron reductions at room temperature. The anion radicals and di-anions show diminished visible bands (similar to 450 nm and 600-700 nm) and intense absorptions in the 800-nm and 1100-nm region, respectively. Some of the near-IR bands have extinction coefficients greater than 1.5 x 10(5) M-1 cm(-1). (C) 2008 Elsevier B.V. All rights reserved.[[note]]SC
Electrophysiologic evaluation of neuromuscular functions during limb lengthening by callus distraction
No full textRelationship of Anatomical Classifications to Degenerative Changes in Untreated Developmental Dysplasia of the Hip
No full textReduced fat mass in rats fed a high oleic acid-rich safflower oil diet is associated with changes in expression of hepatic PPAR alpha and adipose SREBP-1c-regulated genes
No full textPreparation, electrochemical and spectral properties of free-base and manganese N-methyl-pyridylethynyl porphyrins
No full text[[abstract]]Two series of free-base and manganese N-methyl-pyridylethynyl-5,15-biphenyl porphyrins were synthesized, and their UV-Visible, electrochemical and spectro-electrochemical properties were studied. Cyclic voltammetry experiments showed positive shifts in the reduction potentials and the UV-Visible spectra showed significant red-shifts in the absorption wavelengths of these porphyrins, indicating the effects of N-methyl-pyridylethynyl substituents.[[note]]SC
Biodegradation potential of MTBE and BTEX under aerobic, nitrate reducing, and methanogenic conditions at a gasoline-contaminated site
No full text[[abstract]]In this study, a gasoline-contaminated site was selected to evaluate the biodegrading potential of methyl tert-butyl ether (MTBE) and benzene (B), toluene (T), ethylbenzene (E) and xylenes (X), collectively known as BTEX under aerobic, nitrate reducing, and methanogenic conditions at the site. Results show that in situ microorganisms had capabilities of degrading MTBE and BTEX using MTBE and BTEX as major carbon sources under aerobic condition. Under conditions of nitrate reduction and methanogenesis, BETX could be decomposed by in situ microorganism; but MTBE was not decomposed. The decomposition of BTEX under anaerobic condition was much slower than aerobic condition. Benzene had the slowest degrading rate. In addition, BTEX was decomposed faster and more completely under methanogenic condition than nitrate reducing condition. The on-site activated sludge system is effective in decomposing BTEX but not effective in decomposing MTBE. Results of this study reveal that the enhanced aerobic bioremediation method is more feasible for renovating this site. Injecting air, pure oxygen or oxygen-releasing chemicals will raise the removal rate of pollutants. Results of this study will be helpful in designing a practical system for bioremediation of this and other similar sites.[[note]]SC
Pure primary squamous cell carcinoma of the ovary: a case report and review of the literature.
No full text- …
