L'Espérantiste : organe propagateur de la langue internationale "Espéranto" paraissant à la fin de chaque mois / directeur-fondateur : L. de Beaufront

1903/09/30 (A6,N68)- (A6,N69).

L'Espérantiste : organe propagateur de la langue internationale "Espéranto" paraissant à la fin de chaque mois / directeur-fondateur : L. de Beaufront

1898/10 (A1,N10).

L'Espérantiste : organe propagateur de la langue internationale "Espéranto" paraissant à la fin de chaque mois / directeur-fondateur : L. de Beaufront

1905/04 (A8,N4).

L'Espérantiste : organe propagateur de la langue internationale "Espéranto" paraissant à la fin de chaque mois / directeur-fondateur : L. de Beaufront

1900/04 (A3,N28).

L'Espérantiste : organe propagateur de la langue internationale "Espéranto" paraissant à la fin de chaque mois / directeur-fondateur : L. de Beaufront

1899/01 (A2,N13).

L'Espérantiste : organe propagateur de la langue internationale "Espéranto" paraissant à la fin de chaque mois / directeur-fondateur : L. de Beaufront

1900/08 (A3,N32)-1900/09 (A3,N33).

L'Espérantiste : organe propagateur de la langue internationale "Espéranto" paraissant à la fin de chaque mois / directeur-fondateur : L. de Beaufront

1907/05 (A10,N5).

L'Espérantiste : organe propagateur de la langue internationale "Espéranto" paraissant à la fin de chaque mois / directeur-fondateur : L. de Beaufront

1904/05/31 (A7,N5).

Uso de mezclas de azoxistrobina y triazoles para controlar enfermedades de fin de ciclo de la soja

Las enfermedades de fin de ciclo de la soja (EFC), ampliamente difundidas en Argentina, afectan el rendimiento del cultivo y la calidad de la semilla cosechada. La aplicación foliar de fungicidas representa una alternativa eficiente en las actuales condiciones de cultivo (monocultivo y siembra directa). Los objetivos del presente trabajo fueron 1) determinar los agentes causales de la EFC presentes en los ensayos, 2) evaluar la disminución de rendimiento causada por las EFC y 3) valorar la eficiencia de control de mezclas de triazoles y azoxistrobina aplicados en las etapas reproductivas R3 o R5, para el control de las mismas. Se realizaron cuatro ensayos, dos en la campaña 2004/2005, y dos en la campaña 2005/2006, en Armstrong, Santa Fe, núcleo del área sojera de la Región Pampeana. Se utilizaron dos mezclas de azoxistrobina, una con cyproconazole y otra con difenoconazole, y una mezcla de los dos últimos. Los patógenos detectados fueron: Cercospora kikuchii, Colletotrichum truncatum, Septoria glycines, Glomerella glycines y Phomopsis sojae. Todos los tratamientos tuvieron mayores rendimientos que el control no tratado en todos los ensayos, con un nivel de significancia del 5%. Se concluye que, bajo las condiciones de los ensayos, con altas precipitaciones entre R1 y R5.5, los productos utilizados, controlaron eficientemente las EFC presentes.

Pressure drop coefficients for elliptic and circular sections in one, two and three-row arrangements of plate fin and tube heat exchangers

The objective of the present work is the experimental determination of pressure drop coefficients (loss coefficients) for elliptic and circular sections in one, two and three-row arrangements of plate fin and tube heat exchangers. The experiments permitted to correlate the dimensionless loss coefficient with the flow Reynolds number in the rectangular channel formed by the plate fins. The experimental technique consisted of the measurement of the longitudinal pressure distribution along the flow channel, for several values of air mass flow rate. The total number of data runs, each one characterized by the flow Reynolds number, was 216. The present geometry is used in compact heat exchangers for air conditioning systems, heaters, radiators, and others. Also, it is verified the influence of the utilization of elliptic tubes, instead of circular ones, in the pressure drop. The measurements were performed for Reynolds numbers ranging from 200 to 1900.

Tabula geographica Europae ad statum, quo sub finem anni 900 post Christ. nat. suit = L'Europe à la fin de l'an. 900 après naiss. de J. Chr. / in usum iuventutis erudiendae descripta a C. Kruse.

0-meridiaani: Ferro.

Effects of Fin Parameters on Gas-Side Heat Transfer Performance of H-Type Finned Tube Bundle in a Waste Heat Recovery Boiler

Alfa Laval Aalborg Oy designs and manufactures waste heat recovery systems utilizing extended surfaces. The waste heat recovery boiler considered in this thesis is a water-tube boiler where exhaust gas is used as the convective heat transfer medium and water or steam flowing inside the tubes is subject to cross-flow. This thesis aims to contribute to the design of waste heat recovery boiler unit by developing a numerical model of the H-type finned tube bundle currently used by Alfa Laval Aalborg Oy to evaluate the gas-side heat transfer performance. The main objective is to identify weaknesses and potential areas of development in the current H-type finned tube design. In addition, numerical simulations for a total of 15 cases with varying geometric parameters are conducted to investigate the heat transfer and pressure drop performance dependent on H-type fin geometry. The investigated geometric parameters include fin width and height, fin spacing, and fin thickness. Comparison between single and double tube type configuration is also conducted. Based on the simulation results, the local heat transfer and flow behaviour of the H-type finned tube is presented including boundary layer development between the fins, the formation of recirculation zone behind the tubes, and the local variations of flow velocity and temperature within the tube bundle and on the fin surface. Moreover, an evaluation of the effects of various fin parameters on heat transfer and pressure drop performance of H-type finned tube bundle has been provided. It was concluded that from the studied parameters fin spacing and fin width had the most significant effect on tube bundle performance and the effect of fin thickness was the least important. Furthermore, the results suggested that the heat transfer performance would increase due to enhanced turbulence if the current double tube configuration is replaced with single tube configuration, but further investigation and experimental measurements are required in order to validate the results.