# Université de Technologie de Belfort-Montbéliard

Belfort, France

27
Members

## Publication History View all

• Source
##### Article: Rapid in situ fabrication of Fe/SiC bulk nanocomposites by selective laser melting directly from a mixed powder of microsized Fe and SiC
[Hide abstract]
ABSTRACT: Fe/SiC bulk nanocomposites were fabricated by selective laser melting (SLM) directly from a simple mixture of microsized Fe and SiC. Uniformly dispersed nanosized SiC particles with a mean particle size of 78 nm were obtained and fine homogeneous needle-shaped martensite and partial pearlitic microstructures were observed in different planes of the SLM-fabricated Fe/SiC composites. The Fe/SiC nanocomposite exhibits much higher strength than pure Fe sample, with an ultimate tensile strength of up to 753 ± 49 MPa.
Scripta Materialia 03/2014; 75:90–93.
• Source
##### Article: Adaptive-Gain Second Order Sliding Mode Observer Design for Switching Power Converters
[Hide abstract]
ABSTRACT: In this paper, a novel adaptive-gain Second Order Sliding Mode (SOSM) observer is proposed for multicell converters by considering it as a class of hybrid systems. The aim is to reduce the number of voltage sensors by estimating the capacitor voltages only from the measurement of load current. The proposed observer is proven to be robust in the presence of perturbations with \emph{unknown} boundary. However, the states of the system are only partially observable in the sense of observability rank condition. Due to its switching behavior, a recent concept of $Z(T_N)$ observability is used to analysis its hybrid observability, since its observability depends upon the switching control signals. Under certain condition of the switching sequences, the voltage across each capacitor becomes observable. Simulation results and comparisons with Luenberger switched observer highlight the effectiveness and robustness of the proposed observer with respect to output measurement noise and system uncertainties (load variations).
Control Engineering Practice 11/2013;
• ##### Article: Selective laser melting commercially pure Ti under vacuum
[Hide abstract]
ABSTRACT: A commercially pure Ti part was produced using self-developed vacuum selective laser melting system. A smooth surface with roughness Ra 5 μm can be obtained due to avoiding balling process. The density value of the samples with low laser scanning velocity was the same as the theoretical density value. The evolution of microstructural feature is also observed with increasing scanning velocity. The phase transformation was shown as follows: fine and homogenous α → irregular acicular martensite α′ → refined zigzag martensite a″.
Vacuum 09/2013; 95:25–29.

#### Information

Belfort, France
• Website
http://www.multiagent.fr/people:koukam_abderrafiaa
Information provided on this web page is aggregated encyclopedic and bibliographical information relating to the named institution. Information provided is not approved by the institution itself. The institution’s logo (and/or other graphical identification, such as a coat of arms) is used only to identify the institution in a nominal way. Under certain jurisdictions it may be property of the institution.

#### Top Collaborating Institutions

• 179,567
Total Impact Points
5008
Members
• 2,914
Total Impact Points
550
Members

#### Collaborations

This map visualizes which other institutions researchers from Université de Technologie de Belfort-Montbéliard have collaborated with.

## Rg score distribution

See how the RG Scores of researchers from Université de Technologie de Belfort-Montbéliard are distributed.