986 resultados para bandwidth 3.1 GHz to 10.6 GHz


Relevância:

100.00% 100.00%

Publicador:

Relevância:

100.00% 100.00%

Publicador:

Resumo:

An ultra-wideband (UWB) printed slot antenna, suitable for integration with the printed circuit board (PCB) of a wireless universal serial-bus (WUSB) dongle is presented. The design comprises a near-rectangular slot fed by a coplanar waveguide printed on a PCB of width 20 mm. The proposed design has a large bandwidth covering the 3.1-10.6 GHz UWB band, unaffected by the ground length, and omnidirectional radiation patterns. A linear phase response throughout the band further confirms its suitability for high-speed wireless connectivity.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

The stabilization of swine wastewaters from swine confined housing by the combination of a upflow anaerobic sludge blanket (UASB) reactor and waste stabilization ponds is a viable alternative to minimize the environmental impact caused by inadequate disposal of swine wastewaters. In the present study, the polluting load of pre-decanted swine wastewater treated with a series of two 0.705 m(3) UASB reactors and then in parallel in aerated and non-aerated stabilization tanks was investigated from January to July, 2000. Physicochemical and microbiological analyses were made adopting standard methods (Standard Methods for Examination of Water and Wastewater, 19th ed., American Public Health Association, Washington, DC, 1995). COD values decreased as the wastewater ran through the integrated biodigestion system dropping from about 3492 +/- 511-4094 mg l(-1) +/- 481 to 124 +/- 52-490 mg l(-1) +/- 230, while nitrate and nitrite levels increased in stabilization tanks, ranging respectively from 4 +/- 0 to 20 mg l(-1) +/- 3 and 3 +/- 1 to 11 mg l(-1) +/- 24. Although the removal of Escherichia coli was more than 97% +/- 6, the effluents of the treatment system still contained unacceptable levels of E. coli (1.6 x 10(3)-1.2 x 10(6) 100 ml(-1)) according to WHO guidelines for use of wastewater in agriculture and aquaculture. These results indicate the necessity of changes on operational characteristics of the treatment system such as an increase of the hydraulic retention time in UASB reactors or in stabilization tanks. (C) 2003 Published by Elsevier Ltd.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

1. Objectives and planning 1.1 Processing JEFF-3.1.2 in ACE format 1.2 Processing JEFF-3.1.2 to JANIS and BOXER format 1.3 Changes in NJOY99.364 1.4 Updates in JEFF-3.1.2 1.5 Processing TENDL-2011

Relevância:

100.00% 100.00%

Publicador:

Resumo:

A dissertação é dirigida a um especial e não resolvido problema na descrição do desenvolvimento religioso de Israel. Em textos do Antigo Testamento acerca do sacrifício de humanos, há uma unidades literárias autônomas relacionadas ao culto a mOlek. Porém, alguns pesquisadores sustentam que o culto a mOlek não tem esta característica. A dissertação aspira a investigar este argumento, concentrando-se em fontes históricas (2Reis 16,3; 17,17.31; 21,6; 23,10). Discutindo fontes ugaríticas duas listas de divindades e um texto funerário nós perguntares acerca das características das divindades mLlK nas culturas cananéias. Em síntese, mOlek é uma divindade ctônica mas não é destinatária de sacrifícios humanos.(AU)

Relevância:

100.00% 100.00%

Publicador:

Resumo:

A dissertação é dirigida a um especial e não resolvido problema na descrição do desenvolvimento religioso de Israel. Em textos do Antigo Testamento acerca do sacrifício de humanos, há uma unidades literárias autônomas relacionadas ao culto a mOlek. Porém, alguns pesquisadores sustentam que o culto a mOlek não tem esta característica. A dissertação aspira a investigar este argumento, concentrando-se em fontes históricas (2Reis 16,3; 17,17.31; 21,6; 23,10). Discutindo fontes ugaríticas duas listas de divindades e um texto funerário nós perguntares acerca das características das divindades mLlK nas culturas cananéias. Em síntese, mOlek é uma divindade ctônica mas não é destinatária de sacrifícios humanos.(AU)

Relevância:

100.00% 100.00%

Publicador:

Resumo:

A dissertação é dirigida a um especial e não resolvido problema na descrição do desenvolvimento religioso de Israel. Em textos do Antigo Testamento acerca do sacrifício de humanos, há uma unidades literárias autônomas relacionadas ao culto a mOlek. Porém, alguns pesquisadores sustentam que o culto a mOlek não tem esta característica. A dissertação aspira a investigar este argumento, concentrando-se em fontes históricas (2Reis 16,3; 17,17.31; 21,6; 23,10). Discutindo fontes ugaríticas duas listas de divindades e um texto funerário nós perguntares acerca das características das divindades mLlK nas culturas cananéias. Em síntese, mOlek é uma divindade ctônica mas não é destinatária de sacrifícios humanos.(AU)

Relevância:

100.00% 100.00%

Publicador:

Relevância:

100.00% 100.00%

Publicador:

Resumo:

The unusual chiral heterocyclic systems, trioxabicyclo[3.3.1]nona-3,7-dienes (bridged bisdioxines), are incorporated as novel spacer molecules into macrocyclic polyether ring systems of various sizes (8, 9 as well as 11-15) by cyclocondensation reaction of the! bisacid chloride 4b or bisesters 6,7 and 10, with several ethylene glycols. The 2:2 macrocycles 12-14 are obtained in approximately 50:50 mixtures of diastereomers. These conclusions are mainly based on HPLC data presented in Table I as well as X-ray analyses of (1R,5R)-8c (space group Pbca, a = 10.163(3) Angstrom, b = 18.999(4) Angstrom, c = 36.187(10) Angstrom, V = 6987(3) Angstrom(3), Z = 8, d(calc) = 1.218 g cm(-3), 6974 reflections, R = 0.0553.), mesolrac-11 (space group P (1) over bar, a = 10.472(5) Angstrom, b = 16.390(5) Angstrom, c = 17.211(5) Angstrom, alpha = 98.69(2)degrees, beta = 93.04(2)degrees, gamma = 98.52(2)degrees, V = 2879.3(18) Angstrom(3), Z = 2, d(calc) = 1.173 g cm(-3), 11,162 reflections, R = 0.0945) and meso-12 (space group P2(1)/c, a = 9.927(2), b = 18.166(3), c = 17.820(3) Angstrom, beta = 96.590(10)degrees, V = 3192.3(10)Angstrom(3), Z = 4, D-c = 1.109 g cm(-3), 3490 reflections, R = 0.0646). The 1:1 macrocycles 8b,c are also formed by intramolecular transesterification of the open-chain bisesters 7b,c and their formation is favored by the use of metal ions as templates. The bridged bisdioxine moieties in 8b and 12 are converted into the corresponding chiral tetra-oxaadamantane spacers to afford macrocycles 16 and 17. Preliminary metal ion complexation studies with selected species (8c, 11-14) were also performed.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

The chiral stabilised azomethine ylide formed from condensation of the dimethyl acetal of acetone with (5S)-5-phenylmorpholinone undergoes stereoselective exo-cycloaddition reactions with a range of doubly and singly activated dipolarophiles when generated in the presence of excess (MgBr2OEt2)-O-.. The cycloadducts can be degraded to yield enantiomerically pure proline derivatives.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

This work is the analysis of a structure of the microstrip antenna designed for application in ultra wide band systems (Ultra Wideband - UWB). This is a prospective analytical study where they tested the changes in the geometry of the antenna, observing their suitability to the proposed objectives. It is known that the UWB antenna must operate in a range of at least 500 MHz, and answer a fractional bandwidth greater than or equal to 25%. It is also desirable that the antenna meets the specifications of track determined by FCC - Federal Communication Commission, which regulates the system in 2002 designating the UWB bandwidth of 7.5 GHz, a range that varies from 3.1 GHz to 10, 6 GHz. by setting the maximum power spectral density of operation in -41.3 dB / MHz, and defining the fractional bandwidth by 20%. The study starts of a structure of geometry in the form of stylized @, which evolves through changes in its form, in simulated commercial software CST MICROWAVE STUDIO, version 5.3.1, and then tested using the ANSOFT HFSS, version 9. These variations, based on observations of publications available from literature referring to the microstrip monopole planar antennas. As a result it is proposed an antenna, called Monopole Antenna Planar Spiral Almost Rectangular for applications in UWB systems - AMQEUWB, which presents simulated and measured results satisfactory, consistent with the objectives of the study. Some proposals for future work are mentioned

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Two botryosphaerans, exopolysaccharides (EPS) secreted by the ascomyceteous fungus Botryosphaeria rhodina, when grown on sucrose and fructose as sole carbon sources, were structurally compared after their isolation from the culture medium. Both EPS were submitted to trypsin digestion, and eluted as a single peak on gel filtration. Total acid hydrolysis yielded only glucose, and data from methylation analysis and Smith degradation indicated that both EPS constituted a main chain of glucopyranosyl beta(1 -> 3) linkages substituted at O-6. The products obtained after partial acid hydrolysis demonstrated side chains consisting of glucosyl- and gentiobiosyl- linked beta(1 -> 6) residues. C-13-NMR spectroscopy studies showed that all glucosidic linkages were of the beta-configuration. The carbon source affected the side chain structures of botryosphaeran but not the main chain makeup. Sucrose produced less branching (21%) than fructose (31%). (c) 2005 Published by Elsevier Ltd.