Friction factors, convective heat transfer coefficients and the Colburn analogy for industrial sugarcane juices

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

The aggregation process in tetraethoxysilane-derived sonogels as an analogy to the critical phenomenon

The structural evolution in silica sols prepared from tetraethoxysilane (TEOS) sonohydrolysis was studied 'in situ' using small-angle x-ray scattering (SAXS). The structure of the gelling system can be reasonably well described by a correlation function given by gamma(r) similar to (1/R(2))(1/r) exp(- r/xi), where xi is the structure correlation length and R is a chain persistence length, as an analogy to the Ornstein-Zernike theory in describing critical phenomenon. This approach is also expected for the scattering from some linear and branched molecules as polydisperse coils of linear chains and random f-functional branched polycondensates. The characteristic length. grows following an approximate power law with time t as xi similar to t(1) (with the exponent quite close to 1) while R remains undetermined but with a constant value, except at the beginning of the process in which the growth of. is slower and R increases by only about 15% with respect to the value of the initial sol. The structural evolution with time is compatible with an aggregation process by a phase separation by coarsening. The mechanism of growth seems to be faster than those typically observed for pure diffusion controlled cluster-cluster aggregation. This suggests that physical forces (hydrothermal forces) could be actuating together with diffusion in the gelling process of this system. The data apparently do not support a spinodal decomposition mechanism, at least when starting from the initial stable acid sol studied here.

Citrus greening disease investigation using micro synchrotron radiation X-ray fluorescence in association with soft independent modelling of class analogy (SIMCA)

This study describes the use of micro synchrotron radiation X-ray fluorescence (µSR-XRF) to investigate citrus greening disease in sweet orange (Citrus sinensis) plants. An experiment using healthy plants as control and plants of the same variety infected with Candidatus Liberibacter asiaticus (CLas) was performed to verify variations of the mineral composition of citrus leaves. A µSR-XRF system using the D09B X-ray fluorescence beam line at the Brazilian Synchrotron Light Source (LNLS, Campinas, São Paulo State) was employed for this purpose. The data were analyzed using a chemometric tool called soft independent modelling of class analogy (SIMCA). The promising results from SIMCA models reinforce the evidence that plants infected by citrus greening (both asymptomatic and symptomatic) undergo alterations in their micro- and macronutrient compositions.

Is there a Population II analogy to the F star lithium dip?

Observers have found a small number of lithium-depleted halo stars in the temperature range of the Spite plateau. The current status of the mass-loss hypothesis for producing the observed lithium dip in Population (Pop) I stars is briefly discussed and extended to Pop II stars as a possible explanation for these halo objects. Based on detections of F-type main-sequence variables, mass loss is assumed to occur in a narrow temperature region corresponding to this “instability strip.” As Pop II main-sequence stars evolve to the blue, they enter this narrow temperature region, then move back through the lower temperature area of the Spite plateau. If 0.05 M⊙ (solar mass) or more have been lost, they will show lithium depletion. This hypothesis affects the lithium-to- beryllium abundance, the ratio of high- to low-lithium stars, and the luminosity function. Constraints on the mass-loss hypothesis due to these effects are discussed. Finally, mass loss in this temperature range would operate in stars near the turnoff of metal-poor globular clusters, resulting in apparent ages 2 to 3 Gyr (gigayears) older than they actually are.

The natural principles and analogy of the harmony of form.

Mode of access: Internet.

The psychological basis of phonetic law and analogy.

"Reprinted from the Publications of the Modern language association of America, vol. IX, no. 2."

A key to the classical pronunciation of Greek, Latin and Scripture proper names : in which the words are accented and divided into syllables exactly as they ought to be pronounced, according to rules drawn from analogy and the best usage : to which are added, terminational vocabularies of Hebrew, Greek and Latiln proper names, in which the words are arranged according to their final syllables, and classed according to their accents : by which the general analogy of pronunciation may be seen at one view, and the accentuation of each word more earily remembered : concluding with observations on the Greek and Latin accent and quantity : with some probable conjectures on the method of freeing them from the obscurity and confusion in which they are involved, both by the ancients and moderns ... /

"Errata": p. 285.

A Philosophical enquiry in the nature, origin and extent of animal motion, deduced from the principles of reason and analogy /

Mode of access: Internet.

An inquiry into the present state of medical surgery; including the analogy betwixt external and internal disorders... vol. I /

Mode of access: Internet.

A key to the classical pronunciation of Greek, Latin, and scripture proper names : in which the words are accented and divided into syllables exactly as they ought to be pronounced, according to rules drawn from analogy and the best usuage to which are added terminational vocabularies of Hebrew, Greek and Latin proper names, in which the words are arranged according to their final syllables, and classed according to their accents; by which the general analogy of pronunciation may be seen at one view, and the accentuation of each word more easily remembered. Concluding with observations on the Greek and Latin accents and quantity; with some probable conjectures on the method of freeing them from obscurity and confusion in which they are involved, both by the ancients and moderns /

Edition statement at head of title.

The mirror of nature, presenting a practical illustration of the science of phrenology : accompanied by a chart, embracing an analogy of the mental faculties, in their various degrees of development, and the phenomena produced by their combined activity /

Mode of access: Internet.