Journal des avoués : ou Recueil général des lois, décrets impériaux, décisions du Conseil d'état et de ministres, arrêts et jugemens qui fixent un point de la procédure civile, criminelle ou commerciale

1825 (T29).

Journal des avoués : ou Recueil général des lois, décrets impériaux, décisions du Conseil d'état et de ministres, arrêts et jugemens qui fixent un point de la procédure civile, criminelle ou commerciale

1855 (SER2,T9,A44).

Journal des avoués : ou Recueil général des lois, décrets impériaux, décisions du Conseil d'état et de ministres, arrêts et jugemens qui fixent un point de la procédure civile, criminelle ou commerciale

1810 (T2).

Journal des avoués : ou Recueil général des lois, décrets impériaux, décisions du Conseil d'état et de ministres, arrêts et jugemens qui fixent un point de la procédure civile, criminelle ou commerciale

1812 (T6).

Journal des avoués : ou Recueil général des lois, décrets impériaux, décisions du Conseil d'état et de ministres, arrêts et jugemens qui fixent un point de la procédure civile, criminelle ou commerciale

1813 (T8).

Journal des avoués : ou Recueil général des lois, décrets impériaux, décisions du Conseil d'état et de ministres, arrêts et jugemens qui fixent un point de la procédure civile, criminelle ou commerciale

1812 (T5).

Side peaks in Nb and NbTi point-contact spectra

Superconductor – normal metal point contacts were investigated, using different combinations of Cu, brass, Nb and NbTi. The resulting spectra contained side peaks. The currents at which these side peaks appeared, depended on the radii of the contacts. For contacts with Nb this dependence was quadratic, while for contacts with NbTi it was linear. Based on this, we argue that the side peaks in the case of the Nb contacts are due to the critical current density being exceeded. In contrast, side peaks of the NbTi contacts are caused by the self-magnetic field exceeding the lower critical field of NbTi. The NbTi contacts did not show the expected contribution from the vanishing Maxwell resistance of the superconductor, a question which remained open.

Critical aspects on the behavior of material from the mechanical tool-workpiece interaction in single point diamond turning

Some material aspects such as grain size, purity and anisotropy exert an important influence on surface quality, especially in single point diamond turning. The aim of this paper is to present and discuss some critical factors that can limit the accuracy of ultraprecision machining of non-ferrous metals and to identify the effects of them on the cutting mechanism with single point diamond tools. This will be carried out through observations of machined surfaces and chips produced using optical and scanning electron microscopy. Solutions to reduce the influence of some of these limiting factors related with the mechanism of generation of mirror-like surfaces will be discussed.

Parameter optimization of AC rectangular wave outputs for aluminum cold wire GTAW

The objective of this work was to optimize the parameter setup for GTAW of aluminum using an AC rectangular wave output and continuous feeding. A series of welds was carried-out in an industrial joint, with variation of the negative and positive current amplitude, the negative and positive duration time, the travel speed and the feeding speed. Another series was carried out to investigate the isolate effect of the negative duration time and travel speed. Bead geometry aspects were assessed, such as reinforcement, penetration, incomplete fusion and joint wall bridging. The results showed that currents at both polarities are remarkably more significant than the respective duration times. It was also shown that there is a straight relationship between welding speed and feeding speed and this relationship must be followed for obtaining sound beads. A very short positive duration time is enough for arc stability achievement and when the negative duration time is longer than 5 ms its effect on geometry appears. The possibility of optimizing the parameter selection, despite the high inter-correlation amongst them, was demonstrate through a computer program. An approach to reduce the number of variables in this process is also presented.

Estimation of aircraft aerodynamic derivatives using Extended Kalman Filter

Design of flight control laws, verification of performance predictions, and the implementation of flight simulations are tasks that require a mathematical model of the aircraft dynamics. The dynamical models are characterized by coefficients (aerodynamic derivatives) whose values must be determined from flight tests. This work outlines the use of the Extended Kalman Filter (EKF) in obtaining the aerodynamic derivatives of an aircraft. The EKF shows several advantages over the more traditional least-square method (LS). Among these the most important are: there are no restrictions on linearity or in the form which the parameters appears in the mathematical model describing the system, and it is not required that these parameters be time invariant. The EKF uses the statistical properties of the process and the observation noise, to produce estimates based on the mean square error of the estimates themselves. Differently, the LS minimizes a cost function based on the plant output behavior. Results for the estimation of some longitudinal aerodynamic derivatives from simulated data are presented.

Application of the finite element method in cold forging processes

The demand for more efficient manufacturing processes has been increasing in the last few years. The cold forging process is presented as a possible solution, because it allows the production of parts with a good surface finish and with good mechanical properties. Nevertheless, the cold forming sequence design is very empirical and it is based on the designer experience. The computational modeling of each forming process stage by the finite element method can make the sequence design faster and more efficient, decreasing the use of conventional "trial and error" methods. In this study, the application of a commercial general finite element software - ANSYS - has been applied to model a forming operation. Models have been developed to simulate the ring compression test and to simulate a basic forming operation (upsetting) that is applied in most of the cold forging parts sequences. The simulated upsetting operation is one stage of the automotive starter parts manufacturing process. Experiments have been done to obtain the stress-strain material curve, the material flow during the simulated stage, and the required forming force. These experiments provided results used as numerical model input data and as validation of model results. The comparison between experiments and numerical results confirms the developed methodology potential on die filling prediction.

How is OpenAIRE supporting open access policies and infrastructures in Europe? A Nordic point of view!

Presentation at the Nordic Perspectives on Open Access and Open Science seminar, Helsinki, October 15, 2013

Mikrohuokoisen pinnoitteen kehittäminen suodatinkankaan päälle

Mikrohuokoisia membraaneja käytetään monissa suodatussovelluksissa kuten vedenpuhdistuksessa. Tämän työn tavoite oli pinnoittaa suodatinkankaita mikrohuokoisella membraanilla. Membraanimateriaalin ja suodatuskankaan yhdistelmällä tavoiteltiin komposiittimateriaalia, jolla on membraanin selektiivinen erotuskyky ja kankaan mekaaniset ominaisuudet. Tämän työn kirjallisuusosa käsittelee membraanin valmistusta faasi-inversiomenetelmällä, pinnoitteeksi soveltuvia membraanimateriaaleja sekä pinnoitteen lujittamista. Kokeellisessa osassa suodatuskankaalle kehitettiin sopivaa pinnoitusmenetelmää. Pinnoitemateriaaleina käytettiin akryylidispersioainetta, polyamidia ja polysulfonia. Tuloksista huomattiin, ettei akryylidispersioaine soveltunut pinnoitemateriaaliksi. Kangasta onnistuttiin pinnoittamaan polyamidilla ja pinnoitusolosuhteita kontrolloimalla saatiin aikaiseksi pinnoite, joka pysyi kankaassa kiinni ja jonka rakenne koostui noin 12 μm huokosista. Polymeeriliuoksen pitoisuuden huomattiin vaikuttavan pinnoitteen rakenteeseen, mutta siihen jäi edelleen suuria avoimia huokosia. Suuret yksittäiset huokoset laskivat kuplapistepainetta ja tekivät huokoskokojakaumasta leveämmän. Polyamidipitoisuudella 14 ja 16 m–% pinnoite oli tunkeutunut kankaan sisään ja sen rakenne oli huokoinen, mutta pintakerrokseen muodostunut tiivis ihokerros tukki materiaalia. Tulosten perusteella kankaiden pinnoittaminen membraanikerroksella on mahdollista mutta pinnoitusprosessia täytyy edelleen kehittää, jotta päästään pienempään huokoskokoon ja kapeampaan huokoskokojakaumaan pinnoitteessa.