Difference between heartwood and sapwood
Forest Products Laboratory (U.S.)
1919
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Fundação para a Ciência e a Tecnologia (FCT) and National Natural Science Foundation of China under Grant No. 10771022
This study reports for the dyeing of wool using an enzymatic system comprising laccase (EC 1.10.3.2), dye precursor - 2,5-diaminobenzenesulfonic acid and dye modifiers – cathehol and resorcinol. The effect of the process variables - reaction time, enzyme and modifiers concentration on fabrics colour was studied, according to an appropriate experimental design. Different hues and depth of shades could be achieved varying the concentration of the modifiers and the time of laccase treatment. The duration of the enzymatic reaction appeared to be the most important factor in the dyeing process. Thus the dyeing process, performed at low temperature and mild pH, was advantageous in terms of reduced enzyme and chemicals dosage. The ability of the laccases to generate colour “in situ” from originally non-coloured, low-molecular substances, appe...
Relatório de estágio de mestrado em Ensino do 1.º e do 2.º Ciclo do Ensino Básico
Tese de doutoramento em História Contemporânea
Relatório de estágio de mestrado em Ensino do 1.º e 2.º Ciclo do Ensino Básico
Correlation between spin-phonon coupling and the magnetoelectric properties of EuMnO3 and GdMnO3
were investigated using ceramic samples in this work. The experimental results evidence a stronger spinphonon
coupling in GdMnO3 than in EuMnO3, as well as a clear anomaly in the phonon contribution for the
dielectric constant. This anomaly is located at the paramagnetic-incommensurate antiferromagnetic phasetransition
temperature of GdMnO3, corroborating the existence of a magnetoelectric effect in this system. The
absence of the magnetoelectric effect in EuMnO3 is due to the existing disorder revealed in this compound by
the striking thermal metastability and the large decrease in the activation energy associated with the dielectric
relaxation processes. This kind of behavior has no counterpart in GdMnO3. In fact, it has been confirmed th...
This paper intends to identify ergonomic and environmental risks, in the different sectors of the Portuguese Textile and Clothing Industry (TCI). This identification will be used in order to have a better understanding of the risks in each sector of TCI. Knowing these risks, some more focused proposals oriented by a Lean methodology, could be recommended to eliminate them more rapidly.
The Lean methodology to implement Lean in TCI is already in development and includes
ergonomic and sustainable tools to solve the problems related with the identified risks. These tools will allow analysing and evaluating the risks to improve the work environment.
Although the fire has shaped the Mediterranean ecosystems, the occurrence of fire regimes, i.e., their frequency and intensity, have changed, and contributed to a scenario where fires have become not only more likely to occur, but also more difficult to extinguish. In Portugal, the number of large fires (≥100ha), although statistically irrelevant when compared with the total occurrences representing the past 3 decades only 0.8% of cases, is, however, responsible for the majority of area burned annually, representing 73% of the total area burned during the same period. Although in recent years, there is no statistically significant increase in their number, there is still a slight tendency in the increase of the size of the greater large forest fires, much more marked the larger its greatness.
This paper describes the improvement of the setup process of a mechanical press machine in the metal-mechanic area of an elevators company. The work results from a master thesisc project conducted during a period of five months. The Single-Minute Exchange of Die (SMED) methodology and other Lean Production tools (5S, Visual Management and Standard Work) were applied to reduce the setup times observed at the beginning of the project. With
the developed solutions it was possible to reduce setup times, work-in-process (WIP) and distances travelled by operators. Additionally, the setup operations were standardized and consequently the process has become more fast and intuitive for the operators. These improvements allowed the reduction of energy and materials consumption and, consequently,
a decrease on the Greenhouse Gases’ emissions.
Dissertação de mestrado em Finanças
