Development of a vibrofluidized bed and fluid-dynamic study with dry and wet adipic acid

The vibrofluidized bed developed in this work, consisting of a transparent plexiglass tube with an inner diameter of 0.1 m and a height of 0.5 M was designed for the fluidization of adipic acid. The fluidization behavior of dry adipic acid with particle diameters in the range of 75 - 600 mum and a density of 1340kg/m(3) was studied using mechanical vibration for different sample loads. Variables studied for the wet material include frequency and amplitude of vibration and moisture content of the particles. On the basis of the quantitative flow curve data and visual observations, it is concluded that the fluid dynamics of the bed with wet sticky particles, both vibrating and not vibrating, is different from that of the bed with dry particles. Keywords: vibrofluidized bed, adipic acid, fluid dynamics, acceleration of vibration.20442343

Inverse Scattering Construction of a Dipole Black Ring

Using the inverse scattering method in six dimensions we construct the dipole black ring of five dimensional Einstein-Maxwell-dilaton theory with dilaton coupling a = 2(2/3)^(1/2).The 5d theory can be thought of as the NS sector of low energy string theory in Einstein frame. It can also be obtained by dimensionally reducing six-dimensional vacuum gravity on a circle. Our new approach uses GL(4, R) integrability structure of the theory inherited from six-dimensional vacuum gravity. Our approach is also general enough to potentially generate dipole black objects carrying multiple rotations as well as more exotic multi-horizon configurations

O Aprendizado Formal de Controladoria e a minimização do Efeito Framing: um estudo de decisões gerenciais envolvendo Custos de Oportunidade

The object of this research was to investigate the impact of the formal learning of Auditing, Accounting and Control in the minimization of cognitive biases in management decisions. For this the experimental scenario together with a situation that involved the concept of the Cost of opportunity was delineated. With the help of this concept, this research seeks to understand the behavior associated with the cognitive bias caused by the framing effect. The experiment counted on a control group where the introduction of biases did not exist in the questions submitted to the respondents, and two experimental groups where the questionnaires had biases, the sample being made up of 115 Accounting and Law undergraduate students of the Federal University of Bahia. For the analysis of the experiment Multiple Logistic Regression was used. The results obtained pointed to the inexistence of contributions to the formal learning of Auditing, Accounting and Control in the reduction of the occurrence of the framing effect.El objetivo de esta pesquisa fue verificar el impacto del aprendizaje formal de Contraloría en la minimización de los sesgos cognoscitivos en decisiones gerenciales. Para eso fue delineado un escenario experimental con situación que involucra el concepto de Costo de oportunidad. Con el auxilio de este concepto, se pretende entender el comportamiento asociado al bies cognitivo provocado por el efecto framing. El experimento contó con un grupo de control, donde no existía la introducción de sesgos en las cuestiones a las cuales los respondientes fueron sometidos, y dos grupos experimentales, donde los cuestionarios contenían los sesgos, siendo la muestra compuesta por 155 estudiantes de los cursos de graduación de Ciencias Contables y Derecho de la Universidad Federal de Bahia. Para el análisis del experimento, fue utilizada la Regresión Logística Múltiple. Los resultados encontrados señalaron la inexistencia de contribuciones del aprendizaje formal de Contraloría en la reducción de la ocurrencia del efecto framing.O objetivo desta pesquisa foi verificar o impacto do Aprendizado Formal de Controladoria na minimização dos vieses cognitivos em decisões gerenciais. Para isso, foi delineado um cenário experimental com situação que envolve o conceito de Custo de Oportunidade. Com o auxílio deste conceito, busca-se entender o comportamento associado ao viés cognitivo provocado pelo Efeito Framing. O experimento contou com um grupo de controle, no qual não existia a introdução de vieses nas questões às quais os respondentes foram submetidos; e dois grupos experimentais, nos quais os questionários continham os vieses, sendo a amostra composta por 155 estudantes dos cursos de graduação de Ciências Contábeis e Direito da Universidade Federal da Bahia (UFBA). Para a análise do experimento, foi utilizada a Regressão Logística Múltipla. Os resultados encontrados apontaram para a inexistência de contribuições do Aprendizado Formal de Controladoria na redução da ocorrência do Efeito Framing

Sialic Acid Glycobiology Unveils Trypanosoma cruzi Trypomastigote Membrane Physiology.

Trypanosoma cruzi, the flagellate protozoan agent of Chagas disease or American trypanosomiasis, is unable to synthesize sialic acids de novo. Mucins and trans-sialidase (TS) are substrate and enzyme, respectively, of the glycobiological system that scavenges sialic acid from the host in a crucial interplay for T. cruzi life cycle. The acquisition of the sialyl residue allows the parasite to avoid lysis by serum factors and to interact with the host cell. A major drawback to studying the sialylation kinetics and turnover of the trypomastigote glycoconjugates is the difficulty to identify and follow the recently acquired sialyl residues. To tackle this issue, we followed an unnatural sugar approach as bioorthogonal chemical reporters, where the use of azidosialyl residues allowed identifying the acquired sugar. Advanced microscopy techniques, together with biochemical methods, were used to study the trypomastigote membrane from its glycobiological perspective. Main sialyl acceptors were identified as mucins by biochemical procedures and protein markers. Together with determining their shedding and turnover rates, we also report that several membrane proteins, including TS and its substrates, both glycosylphosphatidylinositol-anchored proteins, are separately distributed on parasite surface and contained in different and highly stable membrane microdomains. Notably, labeling for α(1,3)Galactosyl residues only partially colocalize with sialylated mucins, indicating that two species of glycosylated mucins do exist, which are segregated at the parasite surface. Moreover, sialylated mucins were included in lipid-raft-domains, whereas TS molecules are not. The location of the surface-anchored TS resulted too far off as to be capable to sialylate mucins, a role played by the shed TS instead. Phosphatidylinositol-phospholipase-C activity is actually not present in trypomastigotes. Therefore, shedding of TS occurs via microvesicles instead of as a fully soluble form

Controlling spins in adsorbed molecules by a chemical switch

The development of chemical systems with switchable molecular spins could lead to the architecture of materials with controllable magnetic or spintronic properties. Here, we present conclusive evidence that the spin of an organometallic molecule coupled to a ferromagnetic substrate can be switched between magnetic off and on states by a chemical stimulus. This is achieved by nitric oxide (NO) functioning as an axial ligand of cobalt(II)tetraphenylporphyrin (CoTPP) ferromagnetically coupled to nickel thin-film (Ni(001)). On NO addition, the coordination sphere of Co2+ is modified and a NO–CoTPP nitrosyl complex is formed, which corresponds to an off state of the Co spin. Thermal dissociation of NO from the nitrosyl complex restores the on state of the Co spin. The NO-induced reversible off–on switching of surface-adsorbed molecular spins observed here is attributed to a spin trans effect

An electrically charged doubly spinning dipole black ring

We present a new asymptotically flat, doubly spinning black ring of D = 5 Einstein-Maxwell-dilaton theory with Kaluza-Klein dilaton coupling. Besides the mass and two angular momenta, the solution displays both electric charge and (magnetic) dipole charge. The class of solutions that are free from conical singularities is described by four parameters. We first derive the solution in six dimensions employing the inverse scattering method, thereby generalising the inverse-scattering construction by two of the current authors of Emparan's singly spinning dipole black ring. The novel black ring itself arises upon circle Kaluza-Klein reduction. We also compute the main physical properties and asymptotic charges of our new class of solutions. Finally, we present a five-parameter generalisation of our solution.Comment: v2: Improved presentation with new additions including plots of some physical charges and a new appendix with the most general five-parameter solution. Version to be published in JHE

Does Habitual Physical Activity Increase the Sensitivity of the Appetite Control System? A Systematic Review.

BACKGROUND: It has been proposed that habitual physical activity improves appetite control; however, the evidence has never been systematically reviewed. OBJECTIVE: To examine whether appetite control (e.g. subjective appetite, appetite-related peptides, food intake) differs according to levels of physical activity. DATA SOURCES: Medline, Embase and SPORTDiscus were searched for articles published between 1996 and 2015, using keywords pertaining to physical activity, appetite, food intake and appetite-related peptides. STUDY SELECTION: Articles were included if they involved healthy non-smoking adults (aged 18-64 years) participating in cross-sectional studies examining appetite control in active and inactive individuals; or before and after exercise training in previously inactive individuals. STUDY APPRAISAL AND SYNTHESIS: Of 77 full-text articles assessed, 28 studies (14 cross-sectional; 14 exercise training) met the inclusion criteria. RESULTS: Appetite sensations and absolute energy intake did not differ consistently across studies. Active individuals had a greater ability to compensate for high-energy preloads through reductions in energy intake, in comparison with inactive controls. When physical activity level was graded across cross-sectional studies (low, medium, high, very high), a significant curvilinear effect on energy intake (z-scores) was observed. LIMITATIONS: Methodological issues existed concerning the small number of studies, lack of objective quantification of food intake, and various definitions used to define active and inactive individuals. CONCLUSION: Habitually active individuals showed improved compensation for the energy density of foods, but no consistent differences in appetite or absolute energy intake, in comparison with inactive individuals. This review supports a J-shaped relationship between physical activity level and energy intake. Further studies are required to confirm these findings. PROSPERO REGISTRATION NUMBER: CRD42015019696