Technological Institute of Aragon

El Puerto de Santa María, Spain

Technological Institute of Aragon

El Puerto de Santa María, Spain
Time filter
Source Type

Resano M.,University of Zaragoza | Mozas E.,Technological Institute of Aragon | Crespo C.,Technological Institute of Aragon | Briceno J.,University of Zaragoza | And 2 more authors.
Journal of Analytical Atomic Spectrometry | Year: 2010

In this work, the capabilities of solid sampling high-resolution continuum source graphite furnace atomic absorption spectrometry (GFAAS) for the direct determination of the Au content in different body compartments of mice that were previously exposed to Au nanoparticles (AuNP) capped with different compounds have been investigated. It was concluded that this technique offers interesting features for this type of application, permitting the fast (approx. 15 min per sample) and simple analysis of these materials with minimal sample pretreatment, ensuring a similar analytical response regardless of the functionalizing compound chosen for the NP. The potential of this technique for resolving spectral overlaps with PO molecular lines is shown to be essential to ensure interference-free results for those samples containing only a few tens of ng g-1 of Au (brain tissues), such that accurate results can be obtained using straightforward calibration against aqueous standards even in circumstances that would be very unfavorable for traditional line source GFAAS instrumentation. A detection limit of 5 pg (2 ng g-1) is reported. The usefulness of the method proposed to obtain meaningful conclusions regarding i) the temporal biodistribution of small (approx. 2 nm in diameter) AuNP in mouse organs, and ii) the different behavior observed depending upon the functionalizing compound used (glucose or lactose) is also demonstrated. © 2010 The Royal Society of Chemistry.

Escuin D.,University of Zaragoza | Millan C.,Technological Institute of Aragon | Larrode E.,University of Zaragoza
Networks and Spatial Economics | Year: 2012

The aim of the paper is to model urban distribution vehicle routing problems by means of hubs in large cities. The idea behind the urban distribution center (DC) is to provide buffer points where cargo and packages which are to be delivered to shops and businesses can be stored beforehand. At these centers, there will be other kinds of routing problems corresponding to other fairly similar distribution problems. In this paper, a new vehicle routing model (based on the known Time-Dependent Vehicle Routing Problem with Time Windows, TDVRPTW) has been carried out and a change in the traditional approach is proposed, by adopting a system in which some customers are served by urban DCs while remaining customers are served by traditional routes. This study is also motivated by recent developments in real time traffic data acquisition systems, as well as national and international policies aimed at reducing concentrations of greenhouse gases emitted by traditional vans. By using k DCs, the whole problem is now composed of k+1 problems: one special VRPTW for each DC in addition to the main problem, in which some customers and k DC are serviced. The model has been tested by simulating one real case of pharmaceutical distribution within the city of Zaragoza. © 2009 The Author(s).

Artaso P.,Technological Institute of Aragon | Lopez-Nicolas G.,University of Zaragoza
Measurement: Journal of the International Measurement Confederation | Year: 2016

The ability of fast and automatic volume measurement of merchandise is of paramount importance in logistics. In this paper, we address the problem of volume estimation of goods stacked on pallets and transported in pallet trucks. Practical requirements of this industrial application are that the load of the moving pallet truck has to be measured in real-time, and that the measurement system should be non-invasive and non-contact, as well as robust and accurate. The main contribution of this paper is the design of simple, flexible, fast and robust algorithms for volume estimation. A significant feature of these algorithms is that they can be used in industrial environments and that they perform properly even when they use the information provided by different range devices working simultaneously. In addition, we propose a novel perception system for volume measurement consisting of a heterogeneous set of range sensors based on different technologies, such as time of flight and structured light, working simultaneously. Another key point of our proposal is the investigation of the performance of these sensors in terms of precision and accuracy under a diverse set of conditions. We also analyse their interferences and performance when they operate at the same time. Then, the analysis of this study is used to determine the final configuration of the cameras for the perception system. Real experiments proof the performance and reliability of the approach and demonstrate its validity for the industrial application considered. © 2016 Elsevier Ltd. All rights reserved.

Miana M.,Technological Institute of Aragon | Cortes C.,University of Zaragoza | Pelegay J.L.,Technological Institute of Aragon | Valdes J.R.,Technological Institute of Aragon | Putz T.,TRW
IEEE Transactions on Advanced Packaging | Year: 2010

This paper formulates the methodology of transient thermal network modeling (TTNM) for the study of unsteady heat transfer in systems where the presence of multiple length and time scales prevents the analysis by means of current computational or experimental techniques. The TTNM is based on reduced order models (ROMs) and it is established under the essential premise that a transient heat transfer process can be modeled by its division in a succession of stationary states and the division of the geometry in isothermal elements, according to the characteristic time and length scales obtained by scale analysis. The methodology is subsequently validated with canonical examples and considerations are given for the application to practical problems. © 2006 IEEE.

Miana M.,Technological Institute of Aragon | Cortes C.,University of Zaragoza | Pelegay J.L.,Technological Institute of Aragon | Valdes J.R.,Technological Institute of Aragon | And 2 more authors.
IEEE Transactions on Advanced Packaging | Year: 2010

This paper applies the methodology of transient thermal network modelling (TTNM) introduced in Part I to the heat transfer analysis of an electronic control unit (ECU) located in the engine enclosure of a motorcar. The complexity of the geometry, the diverse heat transfer mechanisms involved and the duration of the operating cycle prevent the use of both simple, lumped models and detailed numerical simulations. The TTNM methodology relies instead in steady, approximate heat transfer correlations and a division of the system into the largest possible isothermal elements, based on the analysis of characteristic time and length scales. The dynamic heat balance of each element is then written down, conforming the TTNM of the system, which is numerically integrated with an adequate time step. The practical aspects of the TTNM methodology (design stage) are finally demonstrated; in this particular case-study, the model reveals a very high risk of damage of electronic components due to the radiative heat load received from the exhaust pipe of the engine. A design modification consisting of a radiative shield is proposed and model-tested, achieving an appropriate reduction of heat flux and temperatures, and thus an adequate protection of critical components. © 2006 IEEE.

Resano M.,University of Zaragoza | Bolea-Fernandez E.,University of Zaragoza | Mozas E.,Technological Institute of Aragon | Florez M.R.,University of Zaragoza | And 2 more authors.
Journal of Analytical Atomic Spectrometry | Year: 2013

This work explores the possibilities of solid sampling high-resolution continuum source graphite furnace atomic absorption spectrometry for the direct analysis of carbon nanotubes. In particular, the simultaneous determination of Co, Fe, Ni and Pb is intended, as these elements are typically found in these samples as impurities. The results demonstrate that it is possible to find spectral (monitoring of the region between 283.168 and 283.481 nm), furnace (2500 °C for atomization; use of 100 ng Pd as a chemical modifier) and detector (use of side pixels to expand the linear range) conditions that permit the development of a fast and straightforward method for the simultaneous determination of the target elements at the levels at which they are typically found (mg g-1 for Co, Fe and Ni; μg g-1 for Pb) in carbon nanotubes. Limits of detection of 23 pg (Pb), 6 ng (Fe), 65 ng (Ni) and 86 ng (Co) were obtained, which are suitable for this type of sample. In this way, it was feasible to carry out the analysis of the samples investigated (one candidate reference material and three commercially available samples) and achieve accurate results when constructing the calibration curve with aqueous standards. Precision values for 5 solid sample replicates varied between 7 and 15% RSD in most cases. Overall, the proposed method shows important benefits for the cost-effective analysis of such complex samples in routine labs. This journal is © The Royal Society of Chemistry.

Resano M.,University of Zaragoza | Mozas E.,Technological Institute of Aragon | Crespo C.,Technological Institute of Aragon | Perez J.,IQE | And 2 more authors.
Spectrochimica Acta - Part B Atomic Spectroscopy | Year: 2012

This paper reports on the use of solid sampling-graphite furnace atomic absorption spectrometry for the direct analysis of synthetic amorphous silica. In particular, determination of hazardous elements such As, Cd, Cr, Cu, Pb and Sb is investigated, as required by regulations of the food industry. The conclusion of the work is that, after proper optimization of the working conditions, paying particular attention to the atomization temperature and the use of proper modifiers (graphite powder, HNO 3 or Pd), it is possible to develop suitable procedures that rely on the use of aqueous standard solutions to construct the calibration curves for all the elements investigated. The proposed method shows important benefits for the cost-effective analysis of such difficult samples in routine labs, permitting fast screening of those elements that are very rarely present in this type of sample, but also accurate quantification of those often found, while offering low limits of detection (always below 0.1 mg g - 1) that comply well with legal requirements, and precision levels that are fit for the purpose (approx. 6-9% R.S.D.). © 2012 Elsevier B.V.

Fernandez-Canteli A.,University of Oviedo | Castillo E.,University of Cantabria | Arguelles A.,University of Oviedo | Fernandez P.,University of Oviedo | Canales M.,Technological Institute of Aragon
International Journal of Fatigue | Year: 2012

The determination of the -N field for a certain material, similar to the S-N case, implies a relatively high number of costly and time consuming fatigue tests at different strain amplitudes. For specific applications, the mere estimation of the fatigue limit seems to be sufficient for guaranteeing lifetime safety in fatigue design allowing practical methods to be advantageously applied as a result of the notable reduction of the experimental program implied. In this work, the reliability of the fatigue limit provided by the Risitano thermographic method is investigated in order to check its validity for practical applications. With this aim, an experimental program on a C55E steel under strain control is performed, from which the probabilistic -N field is assessed using the Weibull regression model of Castillo et al., which provides a global solution in both low- and long-cycle fatigue regions. The fatigue limit is derived, primarily as stress range and then compared with that resulting from the Risitano methodology. With the purpose of improving the estimation of the fatigue limit, a novel assessment procedure of the thermographic results is presented that allows an improved correspondence between the fatigue limits arising from both models, thus confirming the suitability of the thermographic technique in practical applications. © 2011 Elsevier Ltd. All rights reserved.

Garcia J.J.T.,University of Oviedo | Alonso I.G.,University of Oviedo | De La Rua Garcia R.B.,R and D Unit | Ibor C.M.,Technological Institute of Aragon
2012 IEEE International Electric Vehicle Conference, IEVC 2012 | Year: 2012

The aim of this research is to develop a set of technologies and standards for the interoperability of an energy-efficient robotic village. Furthermore, the approach for achieving that will be done in the form of a living lab. So the research presented here will be to proof and to tune different technological standards and technologies considered "green", in a large experimental context of a Robotic Village. The research topics associated with it will be related with the increase of the energy efficiency in different daily areas and how they will contribute to the objectives of 2020 agenda from the UE, of reducing human impact on climate change. One of those research areas is the Smart Way, where technological challenges of the EV, the automation in road infrastructure building and the interoperability of road management and transportation systems will be gathered in order to boost a progressive variation of current transportation model. Concretely, the studies and developments necessary to achieve an increase in energy density and service life, reduced recharge times and price decrease will be carried out. © 2012 IEEE.

Chackelson C.,University of Navarra | Errasti A.,University of Navarra | Cipres D.,Technological Institute of Aragon | Lahoz F.,Technological Institute of Aragon
International Journal of Production Research | Year: 2013

Warehouse design has become important due to its impact on service to customers and total logistics costs. Order picking is the key activity of a warehouse and an appropriate design will directly affect its overall performance. The increasing complexity of warehouses means that the main operating strategies such as storage location assignment, batching and routing need to be considered simultaneously. A Design of Experiment approach aided by Discrete Event Simulation could help to meet these new picking design process requirements, especially when various performance measures need to be compared. Some of the trade-offs that managers must keep in mind when designing order picking systems are shown, describing a single-case study carried out at a retail distributor. © 152013 © 2013 Taylor & Francis.

Loading Technological Institute of Aragon collaborators
Loading Technological Institute of Aragon collaborators