Refractive index and layer thickness of an adsorbing protein as reporters of monolayer formation

A method is presented for a separate real-time determination of refractive index and layer thickness of an adsorbing thin layer. The changing angular deflections of TE and TM modes in a dedicated planar waveguide structure are measured. A resolution of 0.01 in the refractive index and 0.5 nm in the average thickness is obtained. The method is illustrated with experimental results on the binding of an antibody to the substrate, both in a physisorption and in an immunoreaction. In the latter, results are consistent with an end-on binding of the antibody to the surface

J. Guillerme, La vie en haute altitude, Paris, Presses Universitaires de France, (Col. Que Sais-je?), 1954, 127 p.

Fil: R.G.C.. Universidad Nacional de Cuyo. Facultad de Filosofía y Letra

Dutch goals for glass recycling

A review with 3 refs. [on SciFinder (R)

F. Pardillo Vaquer, E. M. Biosco, R. Candil Vila. J. Gómez de Llanera y N. Llopis Llado, El Universo y la Tierra, en Enciclopedia Labor, t. I. (Barcelona, Ed. Labor, 1955) 830 p.

Fil: R.G.C.. Universidad Nacional de Cuyo. Facultad de Filosofía y Letra

Automóvil Club Argentino, Guía de viaje de la Argentina. Zona Sur, Buenos Aires, G. Kraft Ltda., 1956, 631 p.

Fil: R.G.C. Universidad Nacional de Cuyo. Facultad de Filosofía y Letra

L. Lliboutry, Nieves y glaciares de Chile. Fundamentos de Glaciología, Santiago de Chile, Ediciones de la Universidad, 1956, 471 p.

Fil: R.G.C.. Universidad Nacional de Cuyo. Facultad de Filosofía y Letra

Effects of deposition and fouling on thermal behaviour of glass furnace regenerators

A model is presented to predict the decrease of the thermal performance of glass furnace regenerators due to fouling by flue gas condensates. The model consists of 4 parts: a description of the thermal performance (heat transfer) of regenerator checkers; a description of chem. reactions in and deposition from flue gases in the regenerator; a description of the heat transfer in the furnace combustion chamber; and detn. of volatilization of S, chloride, and Na components from the melt. The aging and the redn. of the thermal efficiency due to fouling has been predicted for different checker-work constructions, as a function of the pull rate, as a function of glass melt temps., and as a function of the applied cullet fraction in the batch. Depending on the different conditions, the predicted increase in energy consumption is a few percent per yr, mainly due to fouling. Cruciform and chimney block checkers seem to be less sensitive to this fouling than pigeonhole and basket-weave packings. As glass melt temps. increase, dust emissions and fouling rates increase. The model is in quite good agreement with practical observations in industrial furnaces. [on SciFinder (R)

Thermal behaviour of glass batch on batch heating

The heating process of a Ba-Sr glass batch was studied in a 40 L pot furnace, using a multiple thermocouple assembly. The effect of several batch parameters on the heating process was measured, including layer thickness, cullet fraction, water content, and pellets. The results were evaluated using a heat penetration batch model. In the model 2 heating stages, below and above a certain batch transition temp., ns, typically 800 to 900 Deg, are distinguished. Values for the temp.-dependent thermal diffusivity of the batch were derived from exptl. temp. distributions in the batch during heating. Below ns, the thermal diffusivity has an almost const. value of 0.4 * 10-6 m2/s for a std. (powder) batch blanket; for n > ns, the net thermal diffusivity strongly increases with temp., due to the formation of primary melt phases. For ns <n <1100 Deg, the av. value is about 1.4 * 10-6 m2/s. A 100% cullet layer has a 50% higher thermal diffusivity for n <ns; pelletizing the batch has little influence on the virtual thermal diffusivity and (extra) wetting has a retarding effect on batch heating due to extra heat absorption. As for the furnace temp., it appears that increasing the temp. of the glass melt is more effective for improving the batch heating rate than increasing the temp. of the combustion chamber. Practical recommendations are given for batch prepn., charging, and heating in industrial glass tanks. [on SciFinder (R)