Kuorma-auto

Kuorma-auton ovi suljetaan.

Kuorma-auto

Kuorma-auto kaasuttaa, lähtee liikkeelle ja ääni etääntyy

Auto, koira haukkuu

Auto lähestyy ja ajaa ohi. Koira haukkuu taustalla.

Auto jarruttaa

Auto. Auto jarruttaa voimakkaasti asfaltilla jarrut kirskuen.

Auto

Auto käynnistetään ja ajetaan pois.

Auto ja liikkeellelähtö

Kävely autoon. Oven avaaminen. Auton käynnistäminen ja liikkeellelähtö. Lada.

Kuorma-auto

Kuorma-auton oven avaaminen. Auton käynnistäminen ja liikkeellelähtö. Tasaista ajoa. Vaihteiden käyttöä ja lavan kolinaa.

Auto

Auto käynnistetään, lähtee liikkeelle ja etääntyy tasaisesti.

Kuorma-auto

Kuorma-auto lähestyy, pysähtyy, moottori on päällä, kaasuttelua ja moottorin sammutus.

Adaptação de forno de microondas doméstico para realização de reações de transesterificação sob refluxo e catálise por argilas

The microwave oven became an important source of heating for many laboratory procedures including accelerating organic reactions. Reactions that require long reflux times can sometimes be carried out in a few hours or minutes in a conventional microwave oven. However, longer reflux times can be troublesome since domestic microwave ovens are not prepared for these harsh conditions. This technical note presents our finding on heterogeneous catalysis transesterification reactions between b-keto-esters and carbohydrate derivatives under heating or microwave irradiation using an adapted domestic microwave oven.

Auto-associação do dodecilsulfato de sódio (SDS) com o polímero hidrofobicamente modificado etil(hidroxietil) celulose (EHEC)

Mixtures of ethyl(hydroxyethyl)cellulose (EHEC) and Sodium Dodecyl Sulfate (SDS) were investigated using surface tension, conductivity and viscosity measurements in aqueous solutions. The parameters of the surfactant to polymer association processes such as the critical aggregation concentration (cac) and saturation of the polymer by SDS (psp) were determined from the plots of surface tension and specific conductivity versus surfactant concentration. Through the final results we see that there was no specific link of polymer with the surfactant, implying therefore a phenomenon of only cooperative association.

Sistema para realização de medidas de luminescência com excitação por Raios X

In this work is presented a versatile system for X-ray excited optical luminescence (XEOL) measurements. The apparatus was assembled from a sample holder connected to an optical fiber responsibly for the acquisition of the scintillation signal. The spectrum is registered with a CCD coupled in a spectrograph provided with diffraction gratings. The system performance was analyzed by exciting GdAlO3:Eu3+ 3.0 at.% with X-rays from a diffractometer and measuring the emission spectra. The system can be used to obtain precise and reliable spectroscopic properties of samples with various conformations without the loss of the required safety when dealing with ionizing radiations.