Aplicação do ultra-som em sistemas eletroquímicos: considerações teóricas e experimentais

The aim of this review is to present and discuss the applications of ultrasound in electrochemical systems such as in sonoelectroanalysis and sonoelectrolysis for the electrochemical combustion of organic compounds. Initially, theoretical and experimental aspects are discussed, particularly those related to the enhancement of mass transport and the surface cleaning effects. Some results are included to illustrate alternative geometries for the experimental measurements and the working electrodes used in these systems. In the sequence, the available publications are presented and discussed to demonstrate that ultrasound combined with electrochemical techniques is a powerful set-up for the detection of analytes such as metals and/or organic compounds in hostile media and for the effective destruction of toxic organic substances. At the end, a table summarizes the results already published in the literature.

Om det, som bör i achttagas wid belägenheten af en landt-gård

Invocatio: I.J.N.

Oförgripeliga tanckar om den wärkan som et lands upodling har på dess climat

Invocatio: I.J.N.

Om caffé och de inhemska wäxter, som pläga brukas i des ställe

Invocatio: I.J.N.

Determinação de fósforo biodisponível em rações de peixes utilizando extração assistida por ultra-som e espectrofotometria no visível

The aim of the present work was to develop and optimize a method for determination of bioavailable phosphorus in samples of feces and fish feed using ultrasound extraction and subsequent quantification by visible spectrophotometry. Using as extractor solution HNO3 0.50 mol L-1, the great conditions of extraction established were: sample mass - 100 mg, samples granulometry - < 60 µm, sonification time - five cycles of 40 s and ultrasound potency - 136 W. The proposed method was applied in studies of digestibility of this nutrient in different feeds used in diets of juvenile of Nile tilapia.

Om det, som bör i achttagas, wid en stads anlägning

Invocatio: I.J.N.

Om den skada, som kjölden tilfogar åker- och trägårds skötseln i Finland

Invocatio: Med Guds Hjelp.

Om nyttan, som kunnat tilfalla wart kjära fädernesland, af des nybygge i America, fordom Nya Swerige kalladt

Invocatio: Med Guds wälsignande nåd och wederbörandes tilstånd yttrade tankar.

Om nyttan som England kan hafwa af sina nybyggen i norra America

Inv: Med Guds Hjelp.

Om nyttan, som tilfaller en province af en deri anlagd stapelstad

Painovuosi nimekkeestä.

Oral history som tvärvetenskap : : rapport från konferensen Oral history - the Art of dialogue : 8.-10.11.2007 Jagiellonska universitetet Krakow

Ajankohtaista

Minnen från Skatudden, eller, Det Helsingfors som går / pennteckningar af Rud. Wald. Åkerblom

Kuvateos sisältää viisi painokuvaa Rudolf Waldemar Åkerblomin piirustuksista, jotka ovat tallentaneet 1800-luvun lopulla katoamassa ollutta Helsinkiä: Katajanokan puutaloja ja vinoon painuneita hökkeleitä.

Att studera det svenska i Finland som ett pussel

Ajankohtaista

Recension: Catrin Norrby & Gisela Håkansson (2007), Språkinlärning och språkanvändning. Svenska som andraspråk i och utanför Sverige.

Recension.

Som på blånande fjärdar

Soitinnus: lauluääni, piano.