Search results for: K. Rahmouni

Items from 1 to 20 out of 25 results

article

Electrochemical studies of water insertion and proton – Ceramic interaction in substituted perovskite SrZr0.9Ln0.1O2.95

O. Lacroix, K. Rahmouni, A. Sirat, H. Takenouti, more

Journal of Power Sources > 2014 > 270 > C > 506-515

Because of their high ionic conduction even at relatively low temperatures, proton conducting ceramics are one of the most promising electrolytes for fuel cell. In contrast to oxide-ion conductors, proton-conducting systems, especially in an electrolyser plant, could operate below 600 °C, critical temperature for mechanical and hot corrosion resistance of common stainless steels.Proton conduction...

article

Effect of synthesis duration on the morphological and structural modification of the sea urchin-nanostructured γ-MnO₂ and study of its electrochemical reactivity in alkaline medium

L. Benhaddad, C. Bazin, L. Makhloufi, B. Messaoudi, more

Journal of Solid State Electrochemistry > 2014 > 18 > 8 > 2111-2121

Single-crystalline nanorods and sea urchin-like morphology of the γ-MnO₂ nanostructures were successfully synthesized by hydrothermal method at different synthesis durations. The as-synthesized products were characterized by the techniques X-ray powder diffraction (XRD), field emission gun-scanning electron microscope (FEG-SEM) coupled with energy-dispersive X-ray elemental analysis (EDX), transmission...

article

Central PACAP mediates the sympathetic effects of leptin in a tissue-specific manner

M. Tanida, A. Hayata, N. Shintani, N. Yamamoto, more

Neuroscience > 2013 > 238 > Complete > 297-304

We previously demonstrated that the peptidergic neurotransmitter pituitary adenylate cyclase-activating polypeptide (PACAP) affects the autonomic system and contributes to the control of metabolic and cardiovascular functions. Previous studies have demonstrated the importance of centrally-mediated sympathetic effects of leptin for obesity-related hypertension. Here we tested whether PACAP signaling...

article

Erratum to: Increased metabolic rate and insulin sensitivity in male mice lacking the carcino-embryonic antigen-related cell adhesion molecule 2

P. R. Patel, S. K. Ramakrishnan, M. K. Kaw, C. K. Raphael, more

Diabetologia > 2012 > 55 > 3 > 861-861

The online version of the original article can be found at http://dx.doi.org/10.1007/s00125-011-2388-x .

article

Increased metabolic rate and insulin sensitivity in male mice lacking the carcino-embryonic antigen-related cell adhesion molecule 2

P. R. Patel, S. K. Ramakrishnan, M. K. Kaw, C. K. Raphael, more

Diabetologia > 2012 > 55 > 3 > 763-772

Aims/hypothesis The carcino-embryonic antigen-related cell adhesion molecule (CEACAM)2 is produced in many feeding control centres in the brain, but not in peripheral insulin-targeted tissues. Global Ceacam2 null mutation causes insulin resistance and obesity resulting from hyperphagia and hypometabolism in female Ceacam2 homozygous null mutant mice (Cc2 [also known as Ceacam2]^−/−) mice. Because male...

article

Characterization of porous texture of cermet electrode for steam electrolysis at intermediate temperature

C. Deslouis, M. Keddam, K. Rahmouni, H. Takenouti, more

Electrochimica Acta > 2011 > 56 > 23 > 7890-7898

Electrodes designed for PCEC (Proton Conducting Electrolyzing Cell) should ensure both electron and proton conductions and also allowed the supply or the draining of gaseous phase such as steam, hydrogen and oxygen. Porous cermet electrodes fulfil these requirements: percolated metallic phase for electron conduction, ceramic for proton conduction, and pores for transport of reactant and products in...

article

Central GLP-1 receptor signaling directly controls brown adipose tissue thermogenesis

S.H. Lockie, N. Chaudhary, K. Heppner, D. Smiley, more

Appetite > 2011 > 57 > Supplement 1 > S27

article

Reactivity of Nanostructured MnO2 in Alkaline Medium Studied with a Microcavity Electrode: Effect of Oxidizing Agent

L. Benhaddad, L. Makhloufi, B. Messaoudi, K. Rahmouni, more

Journal of Materials Science & Technology > 2011 > 27 > 7 > 585-593

The synthesis of MnO ₂ powders by hydrothermal method with different oxidizing agents has been successfully achieved. The characterizations by scanning electron microscopy, energy-dispersive X-ray analyses, transmission electron microscopy, and X-ray diffraction techniques confirm the synthesis of nanostructured γ-MnO ₂ powders. The electrochemical reactivity of these powders in 1...

chapter

Improving the tests coverage of a medium voltage protection device using system simulation approaches

K Rahmouni, F Pétrot

International Symposium on Industrial Embedded System (SIES) > 184 - 187

2010 International Symposium on Industrial Embedded Systems (SIES 2010)

In this paper we focus on improving the tests coverage of a Schneider Electric protection device using system modeling and simulation techniques. Our approach consists of modeling the device in its operating environment: Timed Transaction Level Models (T-TLM) for the digital parts, Matlab waveforms for the analog parts, and scripting language for the tests automation. This approach is applied on a...

article

Corrosion inhibitive action of cysteine on Cu–30Ni alloy in aerated 0.5M H2SO4

H. Saifi, M.C. Bernard, S. Joiret, K. Rahmouni, more

Materials Chemistry and Physics > 2010 > 120 > 2-3 > 661-669

Corrosion inhibition of Cu–30Ni alloy in aerated 0.5M H ₂ SO ₄ solution by cysteine, an amino acid, has been investigated. Potentiodynamic polarization and impedance spectroscopy (EIS) at open circuit potential were performed. Corrosion current density was also determined from colorimetric experiments. Voltammetric curves showed that cysteine addition to 0.5M H ₂ SO ₄ ...

article

Protection of ancient and historic bronzes by triazole derivatives

K. Rahmouni, H. Takenouti, N. Hajjaji, A. Srhiri, more

Electrochimica Acta > 2009 > 54 > 22 > 5206-5215

Ancient and historic tin bronzes can be substantially affected by corrosion when submitted to non adequate storage conditions or more aggressive environments such as, for example, the marked increase of air pollution and of acidity of rainwater in urban medium recently affecting outdoor monuments. To protect them, some triazole compounds were tested as corrosion inhibitors of bronze covered with patina...

chapter

Modelling and architecture exploration of a medium voltage protection device

K. Rahmouni, P. Gerin, S. Chabanet, P. Pianu, more

2009 IEEE International Symposium on Industrial Embedded Systems > 46 - 49

2009 IEEE International Symposium on Industrial Embedded Systems (SIES)

In this paper we focus on the modelling and architecture exploration of Schneider Electric protection devices at the Cycle Accurate Bit Accurate (CABA) level. The goal is to find the best hardware/software partitioning and improve the tests coverage rate in order to increase the robustness and fault-tolerance of this class of safety devices. This approach is applied on a medium voltage protection...

article

Reactivity of Nanostructured MnO ₂ in Alkaline Medium Studied with a Micro-Cavity Electrode: Effect of Synthesizing Temperature

L. Benhaddad, L. Makhloufi, B. Messaoudi, K. Rahmouni, more

ACS Applied Materials & Interfaces > 2009 > 1 > 2 > 424 - 432

article

Characterisation of anodic layers on Cu–10Sn bronze (RDE) in aerated NaCl solution

L. Robbiola, T.T.M. Tran, P. Dubot, O. Majerus, more

Corrosion Science > 2008 > 50 > 8 > 2205-2215

The anodic surfaces formed on Cu–10Sn (wt.%) alloy (α-bronze) are investigated in aerated 0.1M aqueous chloride solution, using electrochemical reduction and characterisation methods such as scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). On the whole anodic...

article

New insight into the nature and properties of pale green surfaces of outdoor bronze monuments

L. Robbiola, K. Rahmouni, C. Chiavari, C. Martini, more

Applied Physics A > 2008 > 92 > 1 > 161-169

The present study concerns the chemical–physical and electrochemical characterisations of the pale green surfaces formed on outdoor bronzes exposed in urban conditions. In the first part, results from investigations performed on the equestrian statue of the French king Louis XIV exposed in the Palace of Versailles (France) are given. Analyses by energy-dispersive spectrometry and Raman spectroscopy,...

article

Composition and electrochemical properties of natural patinas of outdoor bronze monuments

C. Chiavari, K. Rahmouni, H. Takenouti, S. Joiret, more

Electrochimica Acta > 2007 > 52 > 27 > 7760-7769

The present study concerns the chemical–physical and electrochemical characterizations of the corrosion compounds formed on outdoor bronzes exposed in urban conditions. Here, we focused on the pale green patinas of surfaces directly exposed to the rainfall leaching. The investigation has been performed from scraped-off patina products of a well representative outdoor bronze monument (Monument to Francis...

article

The inhibiting effect of 3-methyl 1,2,4-triazole 5-thione on corrosion of copper in 3% NaCl in presence of sulphide

K. Rahmouni, N. Hajjaji, M. Keddam, A. Srhiri, more

Electrochimica Acta > 2007 > 52 > 27 > 7519-7528

The effect of sulphide addition to the corrosion of copper in 3% NaCl was studied. The concentration of sulphide was remained rather low, up to 10ppm. The effect of sulphide to copper corrosion is controversial in the literature and worth to verify by means of various experimental techniques. The polarization curves, plotted from a potential close to the open circuit one to negative or to positive...

article

Protection of bronze covered with patina by innoxious organic substances

L. Muresan, S. Varvara, E. Stupnišek-Lisac, H. Otmačić, more

Electrochimica Acta > 2007 > 52 > 27 > 7770-7779

Cultural bronze artefacts are exposed in indoor or outdoor environment. They often suffer of a substantial alteration due to an increasing atmospheric pollution. In this work, we propose the use of some innoxious compounds as corrosion inhibitors of bronze objects covered with patina. The bronze used was Cu–6Sn (in wt.%). This composition was selected after a preliminary work on several archaeological...

article

Electrochemical and spectroscopic evidences of corrosion inhibition of bronze by a triazole derivative

A. Dermaj, N. Hajjaji, S. Joiret, K. Rahmouni, more

Electrochimica Acta > 2007 > 52 > 14 > 4654-4662

The electrochemical behavior of the bronze (Cu–8Sn in wt%) was investigated in 3% NaCl aqueous solution, in presence and in absence of a corrosion inhibitor, the 3-phenyl-1,2,4-triazole-5-thione (PTS). The inhibiting effect of the PTS was evidenced for concentrations higher than 1mM for the cathodic process whereas its effect was clearly seen with a concentration as low as 0.1mM for the anodic process...

article

Place des nouveaux traitements de l'ostéodystrophie rénale : dérivés 1α-hydroxylés de la vitamine D « non hypercalcémiants », complexants non calciques, non magnésiens et non aluminiques des phosphates, et calcimimétiques

L. Harbouche, I. Shahapuni, M. Monge, B. Araar, more

Immuno-analyse et biologie specialisee > 2006 > 21 > 1 > 9-32

La biologie moléculaire a récemment démontré que l'activation du récepteur au calcium était prépondérante sur celle du récepteur de la vitamine D pour freiner la sécrétion et la synthèse de PTH et prévenir l'hyperplasie parathyroïdienne. De plus, alors qu'une délétion du gène du récepteur du calcium est létale, l'hyperparathyroïdie et les troubles de la minéralisation osseuse d'une souris dont le...

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Search results for: K. Rahmouni

Electrochemical studies of water insertion and proton – Ceramic interaction in substituted perovskite SrZr0.9Ln0.1O2.95

Effect of synthesis duration on the morphological and structural modification of the sea urchin-nanostructured γ-MnO₂ and study of its electrochemical reactivity in alkaline medium

Central PACAP mediates the sympathetic effects of leptin in a tissue-specific manner

Erratum to: Increased metabolic rate and insulin sensitivity in male mice lacking the carcino-embryonic antigen-related cell adhesion molecule 2

Increased metabolic rate and insulin sensitivity in male mice lacking the carcino-embryonic antigen-related cell adhesion molecule 2

Characterization of porous texture of cermet electrode for steam electrolysis at intermediate temperature

Central GLP-1 receptor signaling directly controls brown adipose tissue thermogenesis

Reactivity of Nanostructured MnO2 in Alkaline Medium Studied with a Microcavity Electrode: Effect of Oxidizing Agent

Improving the tests coverage of a medium voltage protection device using system simulation approaches

Corrosion inhibitive action of cysteine on Cu–30Ni alloy in aerated 0.5M H2SO4

Protection of ancient and historic bronzes by triazole derivatives

Modelling and architecture exploration of a medium voltage protection device

Reactivity of Nanostructured MnO ₂ in Alkaline Medium Studied with a Micro-Cavity Electrode: Effect of Synthesizing Temperature

Characterisation of anodic layers on Cu–10Sn bronze (RDE) in aerated NaCl solution

New insight into the nature and properties of pale green surfaces of outdoor bronze monuments

Composition and electrochemical properties of natural patinas of outdoor bronze monuments

The inhibiting effect of 3-methyl 1,2,4-triazole 5-thione on corrosion of copper in 3% NaCl in presence of sulphide

Protection of bronze covered with patina by innoxious organic substances

Electrochemical and spectroscopic evidences of corrosion inhibition of bronze by a triazole derivative

Place des nouveaux traitements de l'ostéodystrophie rénale : dérivés 1α-hydroxylés de la vitamine D « non hypercalcémiants », complexants non calciques, non magnésiens et non aluminiques des phosphates, et calcimimétiques

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