Metallurgie ou l'Art de tirer et de purifier les métaux /

Mode of access: Internet.

Traité des essais par la voie sèche ou Des propriétés, de la composition et de l'essai des substances métalliques et des combustibles : a l'usage des ingénieurs des mines, des exploitans et des directeurs d'usines /

Contiene: Tome premier.

Nouveau dictionnaire de botanique médicale et pharmaceutique.../

Mode of access: Internet.

Médecine homoeopathique domestique /

Mode of access: Internet.

Resumen de las observaciones meteorológicas ... /

A lo largo de su publicación cambió de editor e impresor.

Manual alfabético razonado de las monedas, pesos y medidas de todos los tiempos y países ... /

Mode of access: Internet.

Dictionnaire abrege des inventions et des decouvertes dans les sciences et dans les arts /

Contiene: t. 2.

Traité élémentaire de physique /

Contiene: Tome 2.

Traité élémentaire de physique /

Contiene: Tome 1.

Renacimiento : drama en tres actos, en prosa /

"Estrenado en el Teatro Vico de Jumilla la noche del 8 de Mayo de 1902, con el titulo de El Marques de Altos-Hornos" - title page.

25 DE DEZEMBRO: SIMBOLISMOS E APROXIMAÇÕES ENTRE OS DEUSES APOLO, HÉLIOS, MITRA E JESUS CRISTO UMA ANÁLISE EM MITOLOGIA COMPARADA

O Solstício de Inverno demonstra, a importância do sol como elemento proporcionador da vida, em inúmeras culturas européias e orientais. Os gregos, de modo um tanto distinto de outros povos, constituíram sua mítica, cultuando dois deuses solares, que se alternaram nas crenças e nos cultos deste povo: Hélios e Apolo. Os latinos, que absorvem parte da mítica grega, cultuando estas divindades, trazem progressivamente, outro deus sol para ser adorado: a divindade persa Mitra. O cristianismo que migra de sua origem local e cultural, para as cidades latinas, principalmente Roma, no primeiro século, provoca e enfrenta um combate constante com as crenças pagãs, principalmente as crenças solares, conseguindo progressivamente, uma supremacia, até o ponto em que as religiões não cristãs, são suprimidas, processo iniciado com o imperador Constantino e finalizado com Teodósio. Entretanto, o imaginário das culturas derrotadas pelo cristianismo, não consegue ser eliminado completamente; os deuses pagãos se instalam, em diversos elementos da nova religião, como na comemoração do nascimento de Jesus Cristo, defendido pela igreja, como acontecido em 25 de dezembro. O período na verdade, era milenarmente anterior ao surgimento do cristianismo, como data do nascimento do deus Mitra, e próximo do Solstício de Inverno, onde eram cultuados os deuses Apolo e Hélios, transformados na cultura latina no culto ao Sol Invicto.

Estudo de um secador híbrido (solar-elétrico) para desidratação de frutas

The growing need for food is something that worries the world, which has a population that is growing at a geometric progression while their resources grows at an arithmetic progression. To alleviate this problem there are some proposals, including increased food production or reduce waste thereof. Many studies have been conducted in the world in order to reduce food waste that can reach 40% of production, depending on the region. For this purpose techniques are used to retard degradation of foods, including drying. This paper presents a design of a hybrid fruit dryer that uses solar energy and electric energy with automation of the process. To accomplish drying tests were chosen Typical fruits with good acceptability as processed fruits. During the experiments were measured temperature values at different points. Were also measured humidity values, solar radiation and mass. A data acquisition system was built using a Arduino for obtaining temperatures. The data were sent to a program named Secador de Frutas, done in this work, to plot the same. The volume of the drying chamber was 423 liters and despite the unusual size test using mirrors to increase the incidence of direct radiation, showed that the drier is competitive when compared with other solar dryers produced in Hydraulic Machines and Solar Energy Laboratory (LMHES ) UFRN. The drier has been built at a cost of 3 to 5 times smaller than industrial dryers that operate with the same load of fruit. And the energy cost to produce dried fruits was more feasible compared with such dryers that use LPG as an energy source. However, the drying time was longer.

Produção e análise do desempenho óptico e elétrico de filmes finos de SnO2:F para aplicações fotovoltaicas

Conselho Nacional de Desenvolvimento Científico e Tecnológico - CNPq

Não-extensividade no contexto da atividade magnética solar: o problema da assimetria hemisférica

Solar activity indicators, each as sunspot numbers, sunspot area and flares, over the Sun’s photosphere are not considered to be symmetric between the northern and southern hemispheres of the Sun. This behavior is also known as the North-South Asymmetry of the different solar indices. Among the different conclusions obtained by several authors, we can point that the N-S asymmetry is a real and systematic phenomenon and is not due to random variability. In the present work, the probability distributions from the Marshall Space Flight Centre (MSFC) database are investigated using a statistical tool arises from well-known Non-Extensive Statistical Mechanics proposed by C. Tsallis in 1988. We present our results and discuss their physical implications with the help of theoretical model and observations. We obtained that there is a strong dependence between the nonextensive entropic parameter q and long-term solar variability presents in the sunspot area data. Among the most important results, we highlight that the asymmetry index q reveals the dominance of the North against the South. This behavior has been discussed and confirmed by several authors, but in no time they have given such behavior to a statistical model property. Thus, we conclude that this parameter can be considered as an effective measure for diagnosing long-term variations of solar dynamo. Finally, our dissertation opens a new approach for investigating time series in astrophysics from the perspective of non-extensivity.

Análise wavelet e modelo de manchas em curvas de luz estelares dos telescópios espaciais Kepler e CoRoT

Analogous to sunspots and solar photospheric faculae, which visibility is modulated by stellar rotation, stellar active regions consist of cool spots and bright faculae caused by the magnetic field of the star. Such starspots are now well established as major tracers used to estimate the stellar rotation period, but their dynamic behavior may also be used to analyze other relevant phenomena such as the presence of magnetic activity and its cycles. To calculate the stellar rotation period, identify the presence of active regions and investigate if the star exhibits or not differential rotation, we apply two methods: a wavelet analysis and a spot model. The wavelet procedure is also applied here to study pulsation in order to identify specific signatures of this particular stellar variability for different types of pulsating variable stars. The wavelet transform has been used as a powerful tool for treating several problems in astrophysics. In this work, we show that the time-frequency analysis of stellar light curves using the wavelet transform is a practical tool for identifying rotation, magnetic activity, and pulsation signatures. We present the wavelet spectral composition and multiscale variations of the time series for four classes of stars: targets dominated by magnetic activity, stars with transiting planets, those with binary transits, and pulsating stars. We applied the Morlet wavelet (6th order), which offers high time and frequency resolution. By applying the wavelet transform to the signal, we obtain the wavelet local and global power spectra. The first is interpreted as energy distribution of the signal in time-frequency space, and the second is obtained by time integration of the local map. Since the wavelet transform is a useful mathematical tool for nonstationary signals, this technique applied to Kepler and CoRoT light curves allows us to clearly identify particular signatures for different phenomena. In particular, patterns were identified for the temporal evolution of the rotation period and other periodicity due to active regions affecting these light curves. In addition, a beat-pattern vii signature in the local wavelet map of pulsating stars over the entire time span was also detected. The second method is based on starspots detection during transits of an extrasolar planet orbiting its host star. As a planet eclipses its parent star, we can detect physical phenomena on the surface of the star. If a dark spot on the disk of the star is partially or totally eclipsed, the integrated stellar luminosity will increase slightly. By analyzing the transit light curve it is possible to infer the physical properties of starspots, such as size, intensity, position and temperature. By detecting the same spot on consecutive transits, it is possible to obtain additional information such as the stellar rotation period in the planetary transit latitude, differential rotation, and magnetic activity cycles. Transit observations of CoRoT-18 and Kepler-17 were used to implement this model.