1,721,062 research outputs found
EXPANSÃO E INTERIORIZAÇÃO DA EDUCAÇÃO SUPERIOR PÚBLICA E GRATUITA: UMA ANÁLISE DA OFERTA E FINANCIAMENTO. BAHIA 2002 – 2006.
Full text linkO trabalho analisa a expansão e interiorização da educação superior pública e gratuita no Estado da Bahia pela análise da expansão da oferta e financiamento diante das mudanças com o advento da nova Lei de Diretrizes e Bases da Educação em 1996, da influência do ideário neoliberal e da política de subvinculação de recursos para a educação básica. Trata de resultado parcial de pesquisa quanti-qualitativa em desenvolvimento no curso de doutorado em educação acerca da oferta e financiamento da educação superior no Brasil e particularmente no Estado da Bahia, no período de 1998 até 2006. Através de levantamento documental das instituições de ensino superior público e gratuito, a pesquisa tem como objetivo estabelecer o perfil de participação dos Governos Federal e Estadual. Constata-se maior participação do Governo Estadual através da ação das quatro universidades estaduais, sendo duas multicampi, com atuação em todo território estadual, implementando a política de interiorização da educação superior pública e gratuita. Do total de matriculas registradas nas duas redes de educação superior no Estado da Bahia no período analisado, 68,0% foram nas instituições estaduais contra 32% na instituição federal
The conductometric titration of cholic acids in non-aqueous solvents
No full textThe study is related to the feasibility of conductometric titrations of cholic acids in non-aqueous solvents (2-methoxyethanol, and 1,2-ethanediol), using N,N-diphenylguanidine as titrant base solubilized in the same solvent
Ionization and Dissociation of Weak Electrolytes. An Initial Approach to Kd and Ki Evaluation.
No full textThe experimental dissociation constant K of weak electrolytes may be consldered as derlved from dlfferent contributions due to the Ionization, K,,and dlssociation, Kd,equlllbrla, respec- tively. AsimplemethodforK,andKdevaluatlonisherein proposed, startlng from experimental K data, obtained by the conductometric method, for plcrlc acld in a set of binary solventsystemmixturesattemperaturesrangingfrom-10 to +80 O C . The correlatlonsbetweenK,and Tand betweenK, and Tare moreover suggested on the basis of a general ex- pression derlved from the Integrated Van’t Hoff equation
Dielectric behaviour of the N,N-dimethylformamide + 2-methoxyethanol + 1,2-dimethoxyethane ternary solvent system from -10° to + 20°C
No full textThe static relative permittivities, epsilon, and excess properties, epsilon(E), of the ternary mixtures N,N-dimethylformamide (DMF)-2-methoxyethanol (ME)-1,2-dimethoxyethane (DME) have been measured at several temperatures in the range -10 to +20-degrees-C. This ternary system shows interesting properties for use as a mixed solvent and for electroanalytical applications. The study of these mixtures should help to increase our understanding of the co-solvation of ionizable and inert solutes. The behaviour of epsilon(E) is quite interesting because this quantity assumes partly positive and partly negative values in the composition domain. As a consequence, there are mixtures which have epsilon(E) = 0, indicating ideal dielectric mixing behaviour. The excess property is discussed in terms of the influence of specific interactions between components, the order and degree of packing in the mixtures and any other effects which produce long-range structure in these mixed liquids.The static relative permittivities, ε, and excess properties, εE, of the ternary mixtures N,N-dimethylformamide (DMF)-2-methoxyethanol (ME)-1,2-dimethoxyethane (DME) have been measured at several temperatures in the range -10 to +20°C. This ternary system shows interesting properties for use as a mixed solvent and for electroanalytical applications. The study of these mixtures should help to increase our understanding of the co-solvation of ionizable and inert solutes. The behaviour of εE is quite interesting because this quantity assumes partly positive and partly negative values in the composition domain. As a consequence, there are mixtures which have εE = 0, indicating ideal dielectric mixing behaviour. The excess property is discussed in terms of the influence of specific interactions between components, the order and degree of packing in the mixtures and any other effects which produce long-range structure in these mixed liquids
Kinematic viscosity studies of the binary ethane-1,2-diol / N,N-dimethylformamide solvent system at various temperatures
No full textKinematic viscosity data (nu) are presented for ethane-1,2-diol, for N,N-dimethylformamide and for nine binary mixtures in the - 10-degrees-C to 80-degrees-C temperature range. The experimental data were fitted by several empirical relations such as Grunberg-Nissan (1949), McAllister (1960), Heric (1966), Lobe (1973), Auslander (1964) and polynomial equations. Some considerations regarding the meaning of the obtained adjustment parameters are made. Furthermore, a new best fit equation is proposed and its validity has been compared to that of the other relations on the basis of the reproducibility of the experimental data
Conductances of sodium tetraphenylborate in 2-methoxyethanol - water binary solvent mixtures
No full textConductance measurements have been carried out on the mixed 2-methoxyethanol (component 1)-water (component 2) solvent system for NaBPh4 solutions at 19 temperatures ranging from - 10 to + 80-degrees-C, and for six binary solvent mixtures covering the 0.1865 less-than-or-equal-to x1 less-than-or-equal-to 1 mole fraction range. The experimental data were processed by the more general Fuoss-Hsia equation, which provides the limiting molar conductance (LAMBDA0). This quantity is well fitted to the function proposed by Speedy and Angell (R. J. Speedy and C. A. Angell, J. Chem. Phys., 1976, 65, 851), LAMBDA0 = LAMBDA0(T/T(s) - 1)gamma, with a singular temperature T(s) for each binary mixture, where A0 and gamma are constants. Furthermore, the activation energy for the limiting equivalent conductivity has been evaluated on the basis of an Arrhenius equation and discussed in terms of the structural solvent-cosolvent complex adduct formation.Conductance measurements have been carried out on the mixed 2-methyoxyethanol (component 1)-water (component 2) solvent system for NaBPh4 solutions at 19 temperatures ranging from -10 to +80°C, and for six binary solvent mixtures covering the 0.1865 ≤ x1 ≤ 1 mole fraction range. The experimental data were processed by the more general Fuoss-Hsia equation, which provides the limiting molar conductance (Λ0). This quantity is well fitted to the function proposed by Speedy and Angell (R. J. Speedy and C. A. Angell, J. Chem. Phys., 1976, 65, 851), Λ0 = A0(T/Ts - 1)γ, with a singular temperature Ts for each binary mixture, where A0 and γ are constants. Furthermore, the activation energy for the limiting equivalent conductivity has been evaluated on the basis of an Arrhenius equation and discussed in terms of the structural solvent-cosolvent complex adduct formation
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The N,N-dimethylformamide + ethane-1,2-diol solvent system. Dielectric constant, refractive index, and related properties at various temperatures
No full textDielectric constant (epsilon) and refractive indexes (n) were measured for pure N,N-dimethylformamide, ethane-1,2-diol, and their six mixtures over the entire composition range and, where possible, at nineteen selected temperatures ranging between -10 and +80-degrees-C. The above properties were fitted by empirical equations stating their dependence on temperature (T) and mole fraction (x1) of the mixture. The refractive indexes of the binary mixtures were used to test the validity of mixing rules at different temperatures
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