Novetats

Cervical cord atrophy and long-term disease progression in patients with primary-progressive multiple sclerosis

UPCommons - dv., 04/20/2018 - 18:31
Cervical cord atrophy and long-term disease progression in patients with primary-progressive multiple sclerosis Aymerich Martínez, Francisco Javier; Auger, Cristina; Alonso, J.; Alberich, Manel; Sastre Garriga, Jaume; Tintoré, Mar; Montalban, Xavier; Rovira, Alex
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New Vectorial Propulsion System and Trajectory Control Designs for Improved AUV Mission Autonomy

UPCommons - dv., 04/20/2018 - 18:24
New Vectorial Propulsion System and Trajectory Control Designs for Improved AUV Mission Autonomy Masmitjà Rusiñol, Ivan; González Agudelo, julian; Galarza Bogota, Cesar; Gomáriz Castro, Spartacus; Aguzzi, Jacopo; Río Fernandez, Joaquín del Autonomous Underwater Vehicles (AUV) are proving to be a promising platform design for multidisciplinary autonomous operability with a wide range of applications in marine ecology and geoscience. Here, two novel contributions towards increasing the autonomous navigation capability of a new AUV prototype (the Guanay II) as a mix between a propelled vehicle and a glider are presented. Firstly, a vectorial propulsion system has been designed to provide full vehicle maneuverability in both horizontal and vertical planes. Furthermore, two controllers have been esigned, based on fuzzy controls, to provide the vehicle with autonomous navigation capabilities. Due to the decoupled system propriety, the controllers in the horizontal plane have been designed separately from the vertical plane. This class of non-linear controllers has been used to interpret inguistic laws into different zones of functionality. This method provided good performance, used as interpolation between different rules or linear controls. Both improvements have been validated through simulations and field tests, displaying good performance results. Finally, the conclusion of this work is that the Guanay II AUV has a solid controller to perform autonomous navigation and carry out vertical immersions
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Influence of pH in the synthesis of ferric tannate pigment for application in antifouling coatings

UPCommons - dv., 04/20/2018 - 17:48
Influence of pH in the synthesis of ferric tannate pigment for application in antifouling coatings Peres, Rafael; Zmozinski, Ariane V.; Moreno Martinez, Juan Antonio; Armelín Diggroc, Elaine Aparecida; Alemán Llansó, Carlos; Ferreira, Carlos Arthur Ferric tannate was synthesized at pH 4 and pH 7 (FT4 and FT7, respectively) as a new class of environmentally friendly antifouling pigments. The solubility of both pigments was evaluated by gravimetric tests, showing that FT4 is more soluble than FT7. A mixture of rosin/acrylic resin (9:1 w/w) was sufficient to form an antifouling coating due to improved matrix properties. Electrochemical impedance spectroscopy (EIS) measurements were used to determine the apparent water coefficient of diffusion (D) and coating behavior. The D in the coating formulated with FT4 exhibited better values than that obtained with FT7. EIS results showed that both coatings present Fickian behavior at the initial stages of immersion, while flat Nyquist plots revealed penetration of water in the films. The physicochemical characteristics of FT4 pigment were determined by thermogravimetry and Fourier transform infrared. Immersion tests in the Mediterranean Sea demonstrated the excellent efficacy of the FT4-containing coating against marine fouling after six months of immersion.
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Introduction to the special issue on ‘‘hydro-meteorological time series analysis and their relation to climate change’’

UPCommons - dv., 04/20/2018 - 17:35
Introduction to the special issue on ‘‘hydro-meteorological time series analysis and their relation to climate change’’ Estévez, Javier; García Marín, Amanda; Báez Benítez, Julián; Casas Castillo, M. del Carmen; Telesca, Luciano
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Initial evaluation of SAR capabilities in UAV multicopter platforms

UPCommons - dv., 04/20/2018 - 15:48
Initial evaluation of SAR capabilities in UAV multicopter platforms Lort Cuenca, Marc; Aguasca Solé, Alberto; López Martínez, Carlos; Martínez Marín, Tomás Airborne synthetic aperture radar (SAR) sensors have been commonly used during the last decades to monitor different phenomena in medium-scale areas of observation, such as object detection and characterization or topographic mapping. The use of unmanned aerial vehicles (UAVs) is a cost-effective solution that offers higher operational flexibility than airborne systems to monitor these types of scenarios. The Universitat Politècnica de Catalunya has developed the first fully polarimetric SAR system at X-band integrated into a small UAV multicopter platform (UAV MP). The sensor, called AiR-based remote sensing, has been integrated into the platform overcoming restrictions of weight, space, robustness, and power consumption. To demonstrate the validity of the developed system, some measurement campaigns have been conducted in the outskirts of Barcelona, Spain. © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
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Diffuse sunlight based calibration of the water vapor channel in the UPC Raman lidar

UPCommons - dv., 04/20/2018 - 15:37
Diffuse sunlight based calibration of the water vapor channel in the UPC Raman lidar Muñoz Porcar, Constantino; Comerón Tejero, Adolfo; Sicard, Michaël; Barragán Cuesta, Rubén; García Vizcaíno, David; Rodríguez Gómez, Alejandro Antonio; Rocadenbosch Burillo, Francisco A method for determining the calibration factor of the water vapor channel of a Raman lidar, based on zenith measurements of diffuse sunlight and on assumptions regarding some system parameters and Raman scattering models, has been applied to the lidar system of Universitat Politècnica de Catalunya (UPC; Technical University of Catalonia, Spain). Results will be analyzed in terms of stability and comparison with typical methods relying on simultaneous radiosonde measurements.
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Snapshot processing of high-order BOC signals in the cloud: on sensitivity and distortion effects

UPCommons - dv., 04/20/2018 - 15:29
Snapshot processing of high-order BOC signals in the cloud: on sensitivity and distortion effects García Molina, José; Fernández Rubio, Juan Antonio; Weiler, R.; Crisci, M. This paper discusses the unambiguous estimation of high-order BOC signals in the cloud based on signal snapshots gathered by low-end SDR receivers. In particular, the sensitivity and distortion problems are introduced, assessing the probability of false lock when using a conventional ML-based estimator (based on the search of the absolute maximum of the cross-correlation function) and a post-correlation ML-based estimator exploiting the a priori known distortion of the cross-correlation function introduced by the filtering stage of the SDR receiver. The simulation results show that, while distortion issues can be handled, sensitivity remains a problem at low C/No conditions and when limited snapshot lengths are considered.
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Sumer and the modern paradigm

UPCommons - dv., 04/20/2018 - 15:15
Sumer and the modern paradigm Azara Nicolás, Pedro
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Cubierta : pérgola para espacios públicos en el barrio de San Pedro Norte de Terrassa

UPCommons - dv., 04/20/2018 - 14:49
Cubierta : pérgola para espacios públicos en el barrio de San Pedro Norte de Terrassa Ferrer Peñuelas, David
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Reaching consensus on communication of critical laboratory results using a collective intelligence method

UPCommons - dv., 04/20/2018 - 13:45
Reaching consensus on communication of critical laboratory results using a collective intelligence method Llovet, Maria Isabel; Biosca, Carmen; Martínez-Iribarren, Alicia; Blanco, Aurora; Busquets, Glòria; Castro Bleda, María José; Llopis, Maria Antonia; Montesinos, Mercé; Minchinela, Joana; Perich, Carme; Prieto, Judith; Ruiz, Rosa; Serrat, Núria; Simón, Margarita; Trejo Omeñaca, Alejandro; Monguet Fierro, José María; Ibarz, Mercè; López-Pablo, Carlos There is no consensus in the literature about what analytes or values should be informed as critical results and how they should be communicated. The main aim of this project is to establish consensual standards of critical results for the laboratories participating in the study. Among the project's secondary objectives, establishing consensual procedures for communication can be highlighted. Consensus was reached among all participating laboratories establishing the basis for the construction of the initial model put forward for consensus in conjunction with the clinicians. A real-time Delphi, methodology
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Contextualizing technology in the classroom via remote access: using space exploration themes and scanning electron microscopy as tools to promote engagement in geology/chemistry experiments

UPCommons - dj., 04/19/2018 - 17:46
Contextualizing technology in the classroom via remote access: using space exploration themes and scanning electron microscopy as tools to promote engagement in geology/chemistry experiments Rodriguez, Brandon; Jaramillo, Veronica; Wolf, Vanessa; Bautista, Esteban; Portillo, Jennifer; Brouke, Alexandra; Min, Ashley; Melendez, Andrea; Amann, Joseph; Pena-Francesch, Abdon; Ashcroft, Jared A multidisciplinary science experiment was performed in K-12 classrooms focusing on the interconnection between technology with geology and chemistry. The engagement and passion for science of over eight hundred students across twenty-one classrooms, utilizing a combination of hands-on activities using relationships between Earth and space rock studies, followed by a remote access session wherein students remotely employed the use of a scanning electron microscope (SEM) and energy-dispersive spectroscopy (EDS) to validate their findings was investigated. Participants represent predominantly low-income minority communities, with little exposure to the themes and equipment used, despite being freely available resources. Students indicated greatly increased interest in scientific practices and careers, as well as a better grasp of the content as a result of the lab and remote access coupling format
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Modelling of pollen dispersion in the atmosphere: evaluation with a continuous 1β+1δ lidar

UPCommons - dj., 04/19/2018 - 17:08
Modelling of pollen dispersion in the atmosphere: evaluation with a continuous 1β+1δ lidar Sicard, Michaël; Izquierdo, Rebeca; Jorba, Oriol; Alarcón, Marta; Belmonte, Jordina; Comerón, Adolfo; de Linares, Concepción; Baldasano, Jose M. Pollen allergenicity plays an important role on human health and wellness. It is thus of large public interest to increase our knowledge of pollen grain behavior in the atmosphere (source, emission, processes involved during their transport, etc.) at fine temporal and spatial scales. First simulations with the Barcelona Supercomputing Center NMMB/BSC-CTM model of Platanus and Pinus dispersion in the atmosphere were performed during a 5-day pollination event observed in Barcelona, Spain, between 27 – 31 March, 2015. The simulations are compared to vertical profiles measured with the continuous Barcelona Micro Pulse Lidar system. First results show that the vertical distribution is well reproduced by the model in shape, but not in intensity, the model largely underestimating in the afternoon. Guidelines are proposed to improve the dispersion of airborne pollen by numerical prediction models.
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The impact of virtual trips on the development of Arabic language oral skills among third grade students in Jordan

UPCommons - dj., 04/19/2018 - 16:27
The impact of virtual trips on the development of Arabic language oral skills among third grade students in Jordan Al-Hijaya, Nayel; Al-Zaghamim, Sumaya; Arouri, Yousef This study aimed at investigating the impact of virtual trips on developing Arabic language oral skills among third grade students in Jordan. The researchers used a quasi-experimental design to answer the research questions. The study sample consisted of 48 students who were chosen purposely. The participants were divided randomly into two groups: 1) experimental group that consisted of 24 students who were taught by using a Virtual Trip Model (VTM), and 2) control group which consisted of 24 students who were taught by using a traditional method of teaching. To achieve the study objectives, the researchers developed a content-based VTM and achievement test to measure Arabic language oral skills. Reliability and validity of the study instruments were checked. To answer the study questions, means and standard deviations were calculated, and ANCOVA test was used. Study results revealed that there were statistically significant differences (α=0.05) between means of students’ achievement test scores attributed to teaching method variable, and in favor of the experimental group. Furthermore, there were no statistically significant differences (α=0.05) between means of students’ achievements test scores attributed to gender variable, and the interaction between teaching method and gender variables. Additional implications and future recommendations were argued
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Feasibility of precise navigation in high and low latitude regions under scintillation conditions

UPCommons - dj., 04/19/2018 - 15:58
Feasibility of precise navigation in high and low latitude regions under scintillation conditions Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo; Rovira Garcia, Adrià; Camps Carmona, Adriano José; Riba Sagarra, Jaume; Barbosa, José; Blanch Llosa, Estefania; Altadill, David; Orús Pérez, Raul Scintillation is one of the most challenging problems in Global Navigation Satellite Systems (GNSS) navigation. This phenomenon appears when the radio signal passes through ionospheric irregularities. These irregularities represent rapid changes on the refraction index and, depending on their size, they can produce also diffractive effects affecting the signal amplitude and, eventually producing cycle slips. In this work, we show that the scintillation effects on the GNSS signal are quite different in low and high latitudes. For low latitude receivers, the main effects, from the point of view of precise navigation, are the increase of the carrier phase noise (measured by s¿) and the fade on the signal intensity (measured by S4) that can produce cycle slips in the GNSS signal. With several examples, we show that the detection of these cycle slips is the most challenging problem for precise navigation, in such a way that, if these cycle slips are detected, precise navigation can be achieved in these regions under scintillation conditions. For high-latitude receivers the situation differs. In this region the size of the irregularities is typically larger than the Fresnel length, so the main effects are related with the fast change on the refractive index associated to the fast movement of the irregularities (which can reach velocities up to several km/s). Consequently, the main effect on the GNSS signals is a fast fluctuation of the carrier phase (large s¿), but with a moderate fade in the amplitude (moderate S4). Therefore, as shown through several examples, fluctuations at high-latitude usually do not produce cycle slips, being the effect quite limited on the ionosphere-free combination and, in general, precise navigation can be achieved also during strong scintillation conditions.
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Validation of a gonio-hyperspectral imaging system based on light-emitting diodes for the spectral and colorimetric analysis of automotive coatings

UPCommons - dj., 04/19/2018 - 15:52
Validation of a gonio-hyperspectral imaging system based on light-emitting diodes for the spectral and colorimetric analysis of automotive coatings Burgos Fernández, Francisco Javier; Vilaseca Ricart, Meritxell; Perales Romero, Esther; Chorro Calderón, Elisabet; Martínez Verdú, Francisco Miguel; Fernández Dorado, José; Pujol Ramo, Jaume In this study, a novel gonio-hyperspectral imaging system based on light-emitting diodes for the analysis of automotive coatings was validated colorimetrically and spectrally from 368 to 1309 nm. A total of 30 pearlescent, 30 metallic, and 30 solid real automotive coatings were evaluated with this system, the BYK-mac and X-Rite MA98 gonio-spectrophotometers, and also with the SPECTRO 320 spectrometer for further comparison. The results showed very precise correlations, especially in the visible range. In conclusion, this new system provides a deeper assessment of goniochromatic pigments than current approaches due to the expansion of the spectral range to the infrared.
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Curso metódico de dibujo lineal : con aplicaciones á las artes, á la industria y á la agrimensura

UPCommons - dj., 04/19/2018 - 15:19
Curso metódico de dibujo lineal : con aplicaciones á las artes, á la industria y á la agrimensura Giró y Aranols, Andrés, 1812-1884 Conté: vol. 1. Parte primera, que comprende el trazado ó dibujo geométrico, el dibujo de imitación, de adorno, lavado y agrimensura Pag.: vol. 1: 320 p., 7 f. de làm. pleg.
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La Ganadería en España : avance sobre la riqueza pecuaria en 1891

UPCommons - dj., 04/19/2018 - 15:18
La Ganadería en España : avance sobre la riqueza pecuaria en 1891 A la part superior de la portada: Dirección General de Agricultura, Industria y Comercio
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Observatorio meteorológico de la granja y la red meteorológica : provincias de Barcelona, Baleares, Gerona, Lérida y Tarragona : Memoria correspondiente al año meteológico de 1895 á 1896

UPCommons - dj., 04/19/2018 - 15:15
Observatorio meteorológico de la granja y la red meteorológica : provincias de Barcelona, Baleares, Gerona, Lérida y Tarragona : Memoria correspondiente al año meteológico de 1895 á 1896 Granja Experimental de Barcelona
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Animales útiles y dañinos á la agricultura

UPCommons - dj., 04/19/2018 - 15:15
Animales útiles y dañinos á la agricultura Joigneaux, Pierre, 1815-1892
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Manual de cultivos agricolas

UPCommons - dj., 04/19/2018 - 15:15
Manual de cultivos agricolas Plá y Rave, Eugenio, -1874 A port.: "Obra declarada de texto para las escuelas por Real Orden de 8 de junio de 1880"
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