Search results for: M.A. Sainz

Items from 1 to 20 out of 22 results

article

In vitro behaviour of Nurse's Ass-phase: A new calcium silicophosphate ceramic

R. Rabadan-Ros, P. Mazón, S. Serena, M.A. Sainz, more

Journal of the European Ceramic Society > 2017 > 37 > 8 > 2943-2952

In the present study, a new single phase Si–Ca–P-based ceramic (called Nurse's A_ss) was obtained and its in vitro behaviour was explored for potential bone tissue regeneration. A porous Si–Ca–P single phase ceramic was obtained from high-temperature sintering of previously synthesised γ-dicalcium silicate and β-tricalcium phosphate. Apatite-mineralisation ability and the dissolution rate were systematically...

article

New evaluation of the in vitro response of silicocarnotite monophasic material

S. Serena, A. Caballero, P.N. de Aza, M.A. Sainz, more

Ceramics International > 2015 > 41 > 8 > 9411-9419

In the present work the in vitro behavior in SBF of monophasic silicocarnotite material has been studied combining different techniques such as ICP-OES, FE-SEM-EDS, AFM, XRD, ATR-FTIR, and Confocal Raman microscopy. The nucleation of precipitates phases on the material surface has been observed from the first stage of the immersion test giving place to a precipitated layer with the increasing soaking...

article

Single-phase silicocarnotite synthesis in the subsystem Ca3(PO4)2–Ca2SiO4

S. Serena, M.A. Sainz, A. Caballero

Ceramics International > 2014 > 40 > 6 > 8245-8252

In the last years, the addition of silicon to hydroxyapatite and tricalcium-phosphate materials is being widely studied, due to the well-known influence of silicon on bone formation. Silicocarnotite (Ca ₅ (PO ₄ ) ₂ SiO ₄ ) presents a structure type carnotite, very close to hydroxyapatite, with a wide range of Ca ²⁺ , SiO ₄ ⁴⁻ and PO ₄ ³⁻...

article

Role of ZnO additions on the β/α phase relation in TCP based materials: Phase stability, properties, dissolution and biological response

L. Carbajal, S. Serena, A. Caballero, M.A. Saínz, more

Journal of the European Ceramic Society > 2014 > 34 > 5 > 1375-1385

Guided by the need to manufacture smart biomaterials, capable to replace and regenerate the mineral component of the bone, with optimized mechanical performance and bioresoption rate under physiological conditions, modified synthetic Zinc doped monophasic and/or biphasic β/α-tricalcium phosphate, Znc-Ca_3-x(PO₄)₂ (Zn-TCP), dense bioceramics with different phase proportions and microstructures were...

article

Analysis of the polymorphic transformation of nano- and microcrystalline zirconia doped with CaO and MgO during reaction-sintering process by neutron thermodiffraction. A thermodynamic approach

S. Serena, A. Caballero, M.A. Sainz

Journal of the European Ceramic Society > 2013 > 33 > 8 > 1413-1424

Polymorphic transformation of zirconia during reaction-sintering process in nano- and microcrystalline mixtures of monoclinic zirconia and dolomite was analyzed using neutron thermodiffraction experiments. This is being the first time that such an approach has been applied in the analysis of these materials. Taking into account the isoplethal section CaO·MgO–ZrO ₂ , the composition, which...

article

Design and processing of ZnO doped tricalcium phosphate based materials: Influence of β/α polymorph phase assemblage on microstructural evolution

L. Carbajal, A. Caballero, M.A. Sainz

Journal of the European Ceramic Society > 2012 > 32 > 3 > 569-577

Tricalcium phosphate (TCP) based biomaterials are excellent candidates in hard tissue engineering due to their similarity to the natural bone composition and outstanding properties. The presence of additives such as (Mg ²⁺ , Zn ²⁺ , F ⁻ , CO ₃ ²⁻ and/or SiO ₄ ⁻ ) in solid solution in the structure of TCP, affects the stability of its different polymorphs...

article

Erratum to “Sintering behaviour and properties of YAlSiO and YAlSiON glass–ceramics” [Ceram. Int. 37 (2011) 1485–1492]

M.A. Sainz, P. Miranzo, M.I. Osendi

Ceramics International > 2011 > 37 > 8 > 3795

article

Comparison of interval and Monte Carlo simulation for the prediction of postprandial glucose under uncertainty in type 1 diabetes mellitus

R. Calm, M. García-Jaramillo, J. Bondia, M.A. Sainz, more

Computer Methods and Programs in Biomedicine > 2011 > 104 > 3 > 325-332

In this paper, the problem of tackling uncertainty in the prediction of postprandial blood glucose is analyzed. Two simulation approaches, Monte Carlo and interval models, are studied and compared. Interval simulation is carried out using modal interval analysis. Simulation of a glucoregulatory model with uncertainty in insulin sensitivities, glucose absorption and food intake is carried out using...

article

Sintering behaviour and properties of YAlSiO and YAlSiON glass-ceramics

M.A. Sainz, P. Miranzo, M.I. Osendi

Ceramics International > 2011 > 37 > 5 > 1485-1492

Four different YAlSiO and YAlSiON compositions that produced either glass or glass-ceramic materials were designed. Densities, glass transition temperatures, coefficients of thermal expansion and hardness data were established for each material. The sintering behavior was determined from the hot stage microscopy (HSM) runs. For the YAlSiO glass compositions, the viscosity–temperature curves were estimated...

article

Influence of design on bioactivity of novel CaSiO3–CaMg(SiO3)2 bioceramics: In vitro simulated body fluid test and thermodynamic simulation

M.A. Sainz, P. Pena, S. Serena, A. Caballero

Acta Biomaterialia > 2010 > 6 > 7 > 2797-2807

A new type of bioactive ceramic has been designed and obtained from high-temperature phase information from the wollastonite (CaSiO ₃ )–diopside (CaMg(SiO ₃ ) ₂ ) phase equilibrium diagram. The selected composition was that corresponding to the eutectic point of the pseudobinary CaSiO ₃ –CaMg(SiO ₃ ) ₂ system. The sintering behaviour, phase evolution,...

article

The system Clinker–MgO–CaZrO3 and its application to the corrosion behavior of CaZrO3/MgO refractory matrix by clinker

S. Serena, M.A. Sainz, A. Caballero

Journal of the European Ceramic Society > 2009 > 29 > 11 > 2199-2209

Phase relations in the clinker-rich region and the limits between the different stability fields of the isothermal section Clinker (CK)–MgO–CaZrO ₃ at 1500°C were experimentally established. The corrosion behavior by clinker of Portland cement of a CaZrO ₃ -rich/MgO refractory matrix obtained from both natural and synthetic raw materials were also studied. The attack mechanism to CaZrO...

article

Corrosion mechanism of polycrystalline corundum and calcium hexaluminate by calcium silicate slags

B.A. Vázquez, P. Pena, A.H. de Aza, M.A. Sainz, more

Journal of the European Ceramic Society > 2009 > 29 > 8 > 1347-1360

The chemical reactions involved in the corrosion of polycrystalline alumina (Al ₂ O ₃ ) and calcium hexaluminate–hibonite (CaAl ₁₂ O ₁₉ ) ceramics by two dicalcium silicate slags with additions of fluorspar (CaF ₂ ) were studied using a hot-stage microscopy (HSM) up to 1600°C. The corrosion mechanism was investigated on post-mortem corroded samples and the phases...

article

SQualTrack: A Tool for Robust Fault Detection

J. Armengol, J. Vehi, M.A. Sainz, P. Herrero, more

IEEE Transactions on Systems, Man, and Cybernetics, Part B (Cybernetics) > 2009 > 39 > 2 > 475 - 488

One of the techniques used to detect faults in dynamic systems is analytical redundancy. An important difficulty in applying this technique to real systems is dealing with the uncertainties associated with the system itself and with the measurements. In this paper, this uncertainty is taken into account by the use of intervals for the parameters of the model and for the measurements. The method that...

article

Protective Si–Al–O–Y glass coatings on stainless steel in situ prepared by combustion flame spraying

M.A. Sainz, M.I. Osendi, P. Miranzo

Surface & Coatings Technology > 2008 > 202 > 9 > 1712-1717

Surface treatments are a common solution for reducing wear and friction, as well as for increasing oxidation and corrosion resistances. Two refractory glass compositions in the SiO ₂ –Al ₂ O ₃ –Y ₂ O ₃ system have been in situ deposited on AISI 304 stainless steel substrates by combustion flame spraying, with an oxyacetylene torch. Both compositions, 66SiO ...

article

Carbon coating and reaction on magnesia-alumina spinel

A.D. Mazzoni, M.A. Sainz, E.F. Aglietti, A. Caballero

Materials Chemistry and Physics > 2007 > 101 > 1 > 211-216

The reactions that took place in the spinel and in the carbon–spinel interface at high temperatures (1250–1800°C) under low oxygen partial pressure (PO2≤10−16 MPa) are described in detail. Scanning electron microscopy equipped with microanalysis by energy dispersion (SEM-EDS) and X-ray diffraction lattice parameter have been used to determine the extent of solid solubility of Al ₂ O ₃...

chapter

Modal fuzzy quantities and applications to control

J. Bondia, A. Sala, M.A. Sainz

NAFIPS 2006 - 2006 Annual Meeting of the North American Fuzzy Information Processing Society > 599 - 604

NAFIPS 2006-2006 Annual Meeting of the North American Fuzzy Information Processing Society

In this paper modal fuzzy quantities and an arithmetic to operate with them are introduced. Based on the identification of a fuzzy quantity with the set of predicates it accepts and rejects, a modal fuzzy quantity is defined. Modal fuzzy intervals arise as a particular case, with either existential or universal modal intervals as alpha-cuts. Modal interval analysis can then be applied to the alpha-cuts,...

article

Controller Design Under Fuzzy Pole-Placement Specifications: An Interval Arithmetic Approach

J. Bondia, A. Sala, J. Pico, M.A. Sainz

IEEE Transactions on Fuzzy Systems > 2006 > 14 > 6 > 822 - 836

This paper discusses fuzzy specifications for robust controller design, as a way to define different specification levels for different plants in a family and allow the control of performance degradation. Controller synthesis will be understood as mapping a fuzzy plant onto a desired fuzzy set of closed-loop specifications. In this context, a fuzzy plant is considered as a possibility distribution...

article

Thermodynamic assessment of the system ZrO ₂ -CaO-MgO using new experimental results - Calculation of the isoplethal section MgO.CaO-ZrO ₂

S. Serena, M.A. Sainz, S. de Aza, A. Caballero

Journal of the European Ceramic Society > 2005 > 25 > 5 > 681-693

The system ZrO ₂ -CaO-MgO offers the possibility of obtaining different types of advanced materials from mixtures of ZrO ₂ with a natural raw material such as dolomite. The development of these promising materials requires the determination of the system's MgO.CaO-ZrO ₂ isoplethal section. The aim of this paper is to carry out the thermodynamic calculation of the system, and...

article

Thermochemical stability of spinel (MgO.Al ₂ O ₃ ) under strong reducing conditions

M.A. Sainz, A.D. Mazzoni, E.F. Aglietti, A. Caballero

Materials Chemistry and Physics > 2004 > 86 > 2-3 > 399-408

The thermochemical stability of the main refractory oxides and some of their compounds under strong reducing conditions has become increasingly important in recent years. In the present work, the formation, sintering and stability of magnesium-alumina spinel (MgAl ₂ O ₄ ) under very low oxygen partial pressure were studied using Ellingham diagrams. Reduction processes of spinel at...

chapter

Quantified set inversion with applications to control

P. Herrero, M.A. Sainz, J. Vehi, L. Jaulin

2004 IEEE International Conference on Robotics and Automation (IEEE Cat. No.4CH 37508) > 179 - 183

2004 IEEE International Symposium on Computer Aided Control Systems Design

This paper describes a new reliable method, based on modal interval analysis (MIA) and set inversion (SI) techniques, for the characterization of solution sets defined by quantified constraints satisfaction problems (QCSP) over continuous domains. The presented methodology, called quantified set inversion (QSI), can be used over a wide range of engineering problems involving uncertain nonlinear models...

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Search results for: M.A. Sainz

In vitro behaviour of Nurse's Ass-phase: A new calcium silicophosphate ceramic

New evaluation of the in vitro response of silicocarnotite monophasic material

Single-phase silicocarnotite synthesis in the subsystem Ca3(PO4)2–Ca2SiO4

Role of ZnO additions on the β/α phase relation in TCP based materials: Phase stability, properties, dissolution and biological response

Analysis of the polymorphic transformation of nano- and microcrystalline zirconia doped with CaO and MgO during reaction-sintering process by neutron thermodiffraction. A thermodynamic approach

Design and processing of ZnO doped tricalcium phosphate based materials: Influence of β/α polymorph phase assemblage on microstructural evolution

Erratum to “Sintering behaviour and properties of YAlSiO and YAlSiON glass–ceramics” [Ceram. Int. 37 (2011) 1485–1492]

Comparison of interval and Monte Carlo simulation for the prediction of postprandial glucose under uncertainty in type 1 diabetes mellitus

Sintering behaviour and properties of YAlSiO and YAlSiON glass-ceramics

Influence of design on bioactivity of novel CaSiO3–CaMg(SiO3)2 bioceramics: In vitro simulated body fluid test and thermodynamic simulation

The system Clinker–MgO–CaZrO3 and its application to the corrosion behavior of CaZrO3/MgO refractory matrix by clinker

Corrosion mechanism of polycrystalline corundum and calcium hexaluminate by calcium silicate slags

SQualTrack: A Tool for Robust Fault Detection

Protective Si–Al–O–Y glass coatings on stainless steel in situ prepared by combustion flame spraying

Carbon coating and reaction on magnesia-alumina spinel

Modal fuzzy quantities and applications to control

Controller Design Under Fuzzy Pole-Placement Specifications: An Interval Arithmetic Approach

Thermodynamic assessment of the system ZrO ₂ -CaO-MgO using new experimental results - Calculation of the isoplethal section MgO.CaO-ZrO ₂

Thermochemical stability of spinel (MgO.Al ₂ O ₃ ) under strong reducing conditions

Quantified set inversion with applications to control

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