ROM-less RNS-to-binary converter moduli {22N ��� 1, 22N + 1, 2N ��� 3, 2N + 3}

In this paper, a novel ROM-less RNS-to-binary converter is proposed, using a new balanced moduli set {22n-1, 22n + 1, 2n-3, 2n + 3} for n even. The proposed converter is implemented with a two stage ROM-less approach, which computes the value of X based only in arithmetic operations, without using lookup tables. Experimental results for 24 to 120 bits of Dynamic Range, show that the proposed converter structure allows a balanced system with 20% faster arithmetic channels regarding the related state of the art, while requiring similar area resources. This improvement in the channel's performance is enough to offset the higher conversion costs of the proposed converter. Furthermore, up to 20% better Power-Delay-Product efficiency metric can be achieved for the full RNS architecture using the proposed moduli set. �� 2014 IEEE.

Exposi����o ocupacional a campos electromagn��ticos em resson��ncia magn��tica: a RM 3 TESLA do Hospital Dona Estef��nia

Mestrado em Radia����es Aplicadas ��s Tecnologias da Sa��de

Rearranjos 3-aza-Cope : efeito dram��tico dos substituintes na velocidade da reac����o

Disserta����o apresentada para a obten����o do Grau de Doutor em Qu��mica Especialidade de Qu��mica Org��nica pela Universidade Nova de Lisboa,Faculdade de Ci��ncias e Tecnologia

Halogen-bonded tris (2,4-Bis(trichloromethyl)-1,3,5,triazapentadienato)-M(III) [M = Mn, Fe, Co] complexes and their catalytic activity in the peroxidative oxidation of 1-phenylethanol to acetophenone

One-pot template condensation of CCl3C=N with ammonia on a metal source [MnCl2 center dot 4H(2)O, FeCl3 center dot 6H(2)O or Co(CH3COO)(2)center dot 4H(2)O] in DMSO led to the formation of tris(2,4-bis(trichloromethyl)-1,3,5-triazapentadienato)-M(III) complexes, [M(NH=C(CCl3)NC(CCl3)=-NH}(3)]center dot n(CH3)(2)SO [M = Mn, n = 1 (1); M = Fe, n = 2 (2); M = Co, n = 2 (3)1, which were characterized using elemental analysis, and IR, ESI-MS and single-crystal X-ray analysis. The role of inter- and intramolecular non-covalent halogen and hydrogen bonds in the synthesis of 1-3 is discussed. It is shown that the crystal ionic radii of the metal ions [68.5 (Co) < 69 (Fe) < 72 (Mn), pm] are related to the corresponding Cl center dot center dot center dot Cl distances [3.178 (3) > 3.155 (2) > 3.133 (1) Al. Compounds 1-3 and the related di(triazapentadienato)-Cu(v) complex [Cu(NH=C(CCl3)NC(CCl3)=NH}2]center dot 2(CH3)(2)SO (4) act as catalyst precursors for the additive-free microwave (MW) assisted homogeneous oxidation of 1-phenylethanol with tert-butylhydroperoxide (TBHP), leading to the formation of acetophenone with yields up to 99% and TONs up to 5.0 x 10(3) after 1 h of low power (10 W) MW irradiation.

Homo-and heteropolymetallic 3-(2-pyridyl)pyrazolate manganese and rhenium complexes

fac-[MBr(CO)(3)(pypzH)] (M = Mn, Re; pypzH = (3-(2-pyridyl) pyrazole) complexes are prepared from fac[ MBr(CO)(3)(NCMe)(2)] and pypzH. The result of their deprotonation depends on the metallic substrate: the rhenium complex affords cleanly the bimetallic compound [fac-{Re(CO)(3)(mu(2)-pypz)}] 2 (mu(2)-pypz = mu(2)-3-(2pyridyl-. 1N) pyrazolate-2. 1N), which was crystallographically characterized, whereas a similar manganese complex was not detected. When two equivalents of pyridylpyrazolate are used, polymetallic species [fac-M(CO) 3(mu(2)-pypz)(mu(3)-pypz) M'] (mu(3)-pypz = mu(3)-3-(2-pyridyl-kappa N-1) pyrazolate-1 kappa 2N, N: 2. 1N:; M = Mn, M' = Li, Na, K; M = Re, M' = Na) are obtained. The crystal structures of the manganese carbonylate complexes were determined. The lithium complex is a monomer containing one manganese and one lithium atom, whereas the sodium and potassium complexes are dimers and reveal an unprecedented coordination mode for the bridging 3-(2-pyridyl) pyrazolate ligand, where the nitrogen of the pyridyl fragment and the nitrogen-1 of pyrazolate are chelated to manganese atoms, and each nitrogen-2 of pyrazolate is coordinated to two alkaline atoms. The polymetallic carbonylate complexes are unstable in solution and evolve spontaneously to [fac-{Re(CO) 3(mu(2)-pypz)}](2) or to the trimetallic paramagnetic species [MnII(mu(2)-pypz) 2{fac-{MnI(CO) 3(mu(2)-pypz)}(2)}]. The related complex cis-[MnCl2(pypzH)(2)] was also synthesized and structurally characterized. The electrochemical behavior of the new homo-and heteropolymetallic 3-(2-pyridyl) pyrazolate complexes has been studied and details of their redox properties are reported.

Mu-Chlorido-Bridged Dimanganese(II) complexes of the schiff base derived from [2+2] condensation of 2,6-diformyl-4-methylphenol and 1,3-bis(3-aminopropyl)tetramethyldisloxane: structure, magnetismo, electrochemical behaviour, and catalytic oxidation of secondary alcohols

The reaction of 2,6-diformyl-4-methylphenol with 1,3-bis(3-aminopropyl)tetramethyldisiloxane in the presence of MnCl2 in a 1:1:2 molar ratio in methanol afforded a dinuclear -chlorido-bridged manganese(II) complex of the macrocyclic [2+2] condensation product (H2L), namely, [Mn2Cl2(H2L)(HL)]Cl center dot 3H(2)O (1). The latter afforded a new compound, namely, [Mn2Cl2(H2L)(2)][MnCl4]center dot 4CH(3)CN center dot 0.5CHCl(3 center dot)0.4H(2)O (2), after recrystallisation from 1:1 CHCl3/CH3CN. The co-existence of the free and complexed azomethine groups, phenolato donors, mu-chlorido bridges, and the disiloxane unit were well evidenced by ESI mass spectrometry and FTIR spectroscopy and confirmed by X-ray crystallography. The magnetic measurements revealed an antiferromagnetic interaction between the two high-spin (S = 5/2, g = 2) manganese(II) ions through the mu-chlorido bridging ligands. The electrochemical behaviour of 1 and 2 has been studied, and details of their redox properties are reported. Both compounds act as catalysts or catalyst precursors in the solvent-free low-power microwave-assisted oxidation of selected secondary alcohols, for example, 1-phenylethanol, cyclohexanol, 2- and 3-octanol, to the corresponding ketones in the absence of solvent. The highest yield of 72% was achieved for 1-phenylethanol by using a maximum of 1% molar ratio of catalyst relative to substrate.

��-Chlorido-bridged dimanganese(II) complexes of the schiff base derived from [2+2] condensation of 2,6-diformyl-4-methylphenol and 1,3-bis(3-aminopropyl)tetramethyldisiloxane: structure, magnetismo, electrochemical behaviour, and catalytic oxidation of secondary alcohols

The reaction of 2,6-diformyl-4-methylphenol with 1,3-bis(3-aminopropyl)tetramethyldisiloxane in the presence of MnCl2 in a 1:1:2 molar ratio in methanol afforded a dinuclear -chlorido-bridged manganese(II) complex of the macrocyclic [2+2] condensation product (H2L), namely, [Mn2Cl2(H2L)(HL)]Cl center dot 3H(2)O (1). The latter afforded a new compound, namely, [Mn2Cl2(H2L)(2)][MnCl4]center dot 4CH(3)CN center dot 0.5CHCl(3 center dot)0.4H(2)O (2), after recrystallisation from 1:1 CHCl3/CH3CN. The co-existence of the free and complexed azomethine groups, phenolato donors, mu-chlorido bridges, and the disiloxane unit were well evidenced by ESI mass spectrometry and FTIR spectroscopy and confirmed by X-ray crystallography. The magnetic measurements revealed an antiferromagnetic interaction between the two high-spin (S = 5/2, g = 2) manganese(II) ions through the mu-chlorido bridging ligands. The electrochemical behaviour of 1 and 2 has been studied, and details of their redox properties are reported. Both compounds act as catalysts or catalyst precursors in the solvent-free low-power microwave-assisted oxidation of selected secondary alcohols, for example, 1-phenylethanol, cyclohexanol, 2- and 3-octanol, to the corresponding ketones in the absence of solvent. The highest yield of 72% was achieved for 1-phenylethanol by using a maximum of 1% molar ratio of catalyst relative to substrate.

Molybdenum ��� and tungsten(II) monometallic 3-(2-pyridyl)pyrazole and bimetallic 3-(2-pyridyl)pyrazolate complexes

Molybdenum and tungsten complexes containing the pypzH (3-(2-pyridyl)pyrazole) ligand as a chelating bidentate are prepared: [Mo(CO)(4)(pypzH)], cis-[MoBr(eta(3)-allyl)(CO)(2)(pypzH)], cis-[MoCl(eta(3)-methallyl)(CO)(2)(pypzH)], [MI2(CO)(3)(pypzH)] (M = Mo, W) from [Mo(CO)(4)(NBD)] or the adequate bis(acetonitrile) complexes. The deprotonation of the molybdenum allyl or methallyl complexes affords the bimetallic complexes [cis-{Mo(eta(3)-allyl)(CO)(2)(mu(2)-pypz)}](2) or [cis-{Mo(eta(3)-methallyl)(CO)(2)(mu(2)-pypz)}](2) (mu(2)-pypz = mu(2)-3-(2-pyridyl-kappa N-1) pyrazolate-2 kappa N-1). The allyl complex was subjected to an electrochemical study, which shows a marked connection between both metallic centres through the bridging pyridylpyrazolates.

Estudos sobre o comportamento mec��nico e estrutural das anteparas n��s 3 e 17 dos salva-vidas da classe vigilante

Disserta����o apresentada na Faculdade de Ci��ncias e Tecnologia da Universidade Nova de Lisboa para obten����o do grau de Mestre em Engenharia Mec��nica

Conce����es das crian��as no 3.�� e 5.�� ano sobre o conceito de ser vivo

Relat��rio de Est��gio apresentado �� Escola Superior de Educa����o de Lisboa para obten����o de grau de mestre em Ensino do 1.�� e 2.�� Ciclo do Ensino B��sico

Evolu����o de estrat��gias de c��lculo mental: um estudo no 3.�� ano de escolaridade

A presente comunica����o ir�� incidir numa investiga����o realizada ao longo do ano letivo de 2013/2014, no ��mbito da unidade curricular ���Pr��tica de Ensino Supervisionada II���, do Mestrado em Ensino do 1.�� e 2.�� Ciclo do Ensino B��sico, que teve como objetivo a compreens��o das estrat��gias de c��lculo mental utilizadas pelos alunos, nas diversas opera����es, envolvendo n��meros naturais, e o modo como estas se desenvolvem, contemplando as seguintes quest��es: i) Qual a import��ncia da implementa����o de uma rotina de c��lculo mental?; ii) Que estrat��gias de c��lculo mental usam os alunos?; iii) De que modo podem evoluir essas estrat��gias?; iv) Qual a import��ncia da discuss��o oral das estrat��gias utilizadas? A metodologia seguiu o paradigma interpretativo, assumindo uma natureza qualitativa. Optou-se pela combina����o de v��rias t��cnicas de recolha de dados: observa����o, entrevista e an��lise documental. Foram analisadas as tiras de c��lculo mental de duas alunas do 3.�� ano ao longo de toda a interven����o e, recorrendo ��s notas de campo efetuadas durante a partilha de estrat��gias, foram ainda analisadas as estrat��gias utilizadas pela turma no in��cio, meio e fim da implementa����o. Por ��ltimo, foi aplicada uma entrevista a essas duas alunas, a qual permitiu a identifica����o das estrat��gias utilizadas, na mesma tira, por cada uma das estudantes.

Significados de fra����o ��� um estudo numa turma de 3.�� ano

Relat��rio de Est��gio apresentado �� Escola Superior de Educa����o de Lisboa para obten����o de grau de mestre em Ensino do 1.�� e do 2.�� Ciclo do Ensino B��sico

Integra����o Intranet ��� Pro/Engineer Wildfire 3.0 Via Pro/Web.Link

Mestrado em Engenharia Inform��tica, ��rea de Especializa����o em Arquiteturas, Sistemas e Redes

Contributo dos m��sculos respirat��rios para a fisiopatologia da hiperc��pnia na doen��a pulmonar cr��nica estabilizada : parte 3 = The role of the respiratory muscles in the pathophisiology of chronic hypercapnia in clinically stable chronic obstructive pulmonary diseases: part 3

Rev Port Pneumol. VII(2): 234-250, 2001

Histopatologia da leishmaniose tegumentar por Leishmania braziliensis braziliensis. 3. Rea����o celular nos tecidos

Os A.A. analisam as altera����es histopatol��gicas observadas em 378 casos de Leishmaniose Tegumentar da localidade de Tr��s Bra��os Estado da Bahia, dos quais 307 eram de portadores de les��es exclusivamente cut��neas, 54 de portadores de les��es exclusivamnte mucosas e 17 de portadores de les��es cut��neo-mucosas. A infiltra����o histiolinfoplasmocit��ria, na maioria dos casos, parece desempenhar o papel de resposta celular inespec��fica �� presen��a de um irritante tecidual, por��m, nos casos de forma mucosa, n��o se pode afastar a possibilidade de que esse infiltrado esteja participando de uma rea����o de tipo autoagressivo. O plasm��cito constitui um elemento quase constante nas les��es desenvolvidas, mas n��o tem sido observado nas les��es residuais, quer em via de cura ou j�� cicatrizadas; sua presen��a nestes casos denota, quase sempre, tend��ncia �� recidiva. Os mastdcitos foram observados em les��es tanto da forma cut��nea como da forma mucosa, mas predominavam nas primeiras. Seu n��mero foi significantemente maior no padr��o de Rea����o Exsudativa e Neer��tico Granulomatosa, onde os fen��menos necr��ticos s��o bem desenvolvidos. Os eosin��filos apresentaram associa����o significativa com os mast��citos, confirmando a exist��ncia de um eixo bidirecional entre est��s duas c��lulas, o qual deve participar da modula����o inflamat��ria, na Leishmaniose Tegumentar. Dois tipos de rea����o granulomatosa foram observados: um desorganizado, em rela����o, muitas vezes, com a necrose tissular, e outro organizado, mais raro, do tipo tubercul��ide. O primeiro foi interpretado como de origem p��s-necr��tica, surgindo com a redu����o da carga parasit��ria, propiciada pelos fen��menos necr��ticos: eliminado o ant��geno e mantidos os n��veis de anticorpos, surgem as condi����es necess��rias ao estabelecimento do granuloma, semelhante ��quele observado nas les��es por imunocomplexo em excesso de anticorpos. O outro tipo de rea����o foi o granuloma de c��lulas epiteli��des, que surgiu em dois grupos de pacientes. Nos pacientes jovens, com doen��a de curto tempo de evolu����o e intradermorrea����o n��o exacerbada, este tipo de granuloma talvez seja a express��o da Hipersensibilidade Granulomatosa Espec��fica, descrita por EPSTEIN (1977). No outro grupo de pacientes, havia em todos intradermorrea����o exacerbada. Nestes casos a hipersensibilidade granulomatosa, associando-se �� hipersensibilidade mediada por c��lulas �� agora ampliada pelo seq��estro do ant��geno ��, refor��aria o processo granulomatoso, atrav��s da reverbera����o do est��mulo ant��g��nico; isso tornaria o tratamento mais dif��cil e pior o progn��stico para o caso.