Makina saltzaile baten diseinu elektronikoa

Nivel educativo: Grado. Duración (en horas): Más de 50 horas

Interacting single atoms with nanophotonics for chip-integrated quantum networks

Underlying matter and light are their building blocks of tiny atoms and photons. The ability to control and utilize matter-light interactions down to the elementary single atom and photon level at the nano-scale opens up exciting studies at the frontiers of science with applications in medicine, energy, and information technology. Of these, an intriguing front is the development of quantum networks where N >> 1 single-atom nodes are coherently linked by single photons, forming a collective quantum entity potentially capable of performing quantum computations and simulations. Here, a promising approach is to use optical cavities within the setting of cavity quantum electrodynamics (QED). However, since its first realization in 1992 by Kimble et al., current proof-of-principle experiments have involved just one or two conventional cavities. To move beyond to N >> 1 nodes, in this thesis we investigate a platform born from the marriage of cavity QED and nanophotonics, where single atoms at ~100 nm near the surfaces of lithographically fabricated dielectric photonic devices can strongly interact with single photons, on a chip. Particularly, we experimentally investigate three main types of devices: microtoroidal optical cavities, optical nanofibers, and nanophotonic crystal based structures. With a microtoroidal cavity, we realized a robust and efficient photon router where single photons are extracted from an incident coherent state of light and redirected to a separate output with high efficiency. We achieved strong single atom-photon coupling with atoms located ~100 nm near the surface of a microtoroid, which revealed important aspects in the atom dynamics and QED of these systems including atom-surface interaction effects. We present a method to achieve state-insensitive atom trapping near optical nanofibers, critical in nanophotonic systems where electromagnetic fields are tightly confined. We developed a system that fabricates high quality nanofibers with high controllability, with which we experimentally demonstrate a state-insensitive atom trap. We present initial investigations on nanophotonic crystal based structures as a platform for strong atom-photon interactions. The experimental advances and theoretical investigations carried out in this thesis provide a framework for and open the door to strong single atom-photon interactions using nanophotonics for chip-integrated quantum networks.

Nuclear weak interaction rates during stellar evolution and collapse

Nuclear weak interaction rates, including electron and positron emission rates, and continuum electron and positron capture rates , as well as the associated v and –/v energy loss rates are calculated on a detailed grid of temperature and density for the free nucleons and 226 nuclei with masses between A = 21 and 60. Gamow-Teller and Fermi discrete-state transition matrix element systematics and the Gamow-Teller T^< →/← T^> resonance transitions are discussed in depth and are implemented in the stellar rate calculations. Results of the calculations are presented on an abbreviated grid of temperature and density and comparison is made to terrestrial weak transition rates where possible. Neutron shell blocking of allowed electron capture on heavy nuclei during stellar core collapse is discussed along with several unblocking mechanisms operative at high temperature and density. The results of one-zone collapse calculations are presented which suggest that the effect of neutron shell blocking is to produce a larger core lepton fraction at neutrino trapping which leads to a larger inner-core mass and hence a stronger post-bounce shock.

El sector agrario guipuzcoano en la encrucijada de los siglos XVI y XVII

[ES]La presente investigación pretende analizar la situación del sector agrario guipuzcoano durante los siglos XVI y XVII, período en el que el sector agropecuario guipuzcoano experimentó una serie de cambios profundos, adoptando una nueva fisionomía, que se consolidó durante los siglos XVIII y XIX, principalmente debido al impacto de la expansión del maíz. Lejos de generalizar a todo el territorio las diferentes dinámicas, se intentará analizar la geografía y ritmo de dichos cambios y transformaciones; la diversidad de situaciones fue importante, teniendo en cuenta que se partía de diferentes condiciones ortográficas, climáticas y económicas.

Zientziaren izaera eta energiaren tratamendu didaktikoa

Nivel educativo: Grado. Duración (en horas): Más de 50 horas

Exploratory survey of Malian and Ndururu traps in River Rima, north western Nigeria

The fabrication and operational techniques of Malian and Ndurutu traps mostly used by the fishermen in River Rima in north western Nigeria were evaluated through structured questionnaire and measurement of samples of the Data collected were analyzed using descriptive statistics. There was no standard in the dimensions of either of the traps. The traps were made of locally sourced materials, except the synthetic net of the Malian trap. About 81 and 80% of the respondents fabricated their Malian and Ndurutu traps, respectively. The major problems encountered in the structure and operation of the Malian trap included projection above water, stealing of catches and trap, and trapping of small sized fishes as indicated by 61.9, 47.6 and 28.6% of the respondents, respectively. In the case of the Ndurutu trap, 72.0, 48.0, 12.0 and 8.0% of the respondents respectively indicated poor durability, single entrance valve, destruction by cattle and instability in water, as the major problems encountered. As improvement measures for the Malian trap, the respondents suggested increase in number and size of valve (81.0%), horizontal positioning (57.1%) and square shape (47.6%) while 52.0% each suggested increase in number of entrance valve and netting of Ndurutu trap. The fishermen demonstrated ingenuity in the fabrication and operation of the traps, but they failed to initiate the required improvement. It is important to critically examine the designs, materials, costs and limitations of the traps and the suggestions of the fishermen, as basis for improvement on the technology of the traps

Crowdfunding para organizaciones del Tercer y Cuarto Sector

Máster en Dirección Empresarial desde la Innovación y la Internacionalización. Curso 2013/2014

Controlling wave propagation through nonlinear engineered granular systems

We study the fundamental dynamic behavior of a special class of ordered granular systems in order to design new, structured materials with unique physical properties. The dynamic properties of granular systems are dictated by the nonlinear, Hertzian, potential in compression and zero tensile strength resulting from the discrete material structure. Engineering the underlying particle arrangement of granular systems allows for unique dynamic properties, not observed in natural, disordered granular media. While extensive studies on 1D granular crystals have suggested their usefulness for a variety of engineering applications, considerably less attention has been given to higher-dimensional systems. The extension of these studies in higher dimensions could enable the discovery of richer physical phenomena not possible in 1D, such as spatial redirection and anisotropic energy trapping. We present experiments, numerical simulation (based on a discrete particle model), and in some cases theoretical predictions for several engineered granular systems, studying the effects of particle arrangement on the highly nonlinear transient wave propagation to develop means for controlling the wave propagation pathways. The first component of this thesis studies the stress wave propagation resulting from a localized impulsive loading for three different 2D particle lattice structures: square, centered square, and hexagonal granular crystals. By varying the lattice structure, we observe a wide range of properties for the propagating stress waves: quasi-1D solitary wave propagation, fully 2D wave propagation with tunable wave front shapes, and 2D pulsed wave propagation. Additionally the effects of weak disorder, inevitably present in real granular systems, are investigated. The second half of this thesis studies the solitary wave propagation through 2D and 3D ordered networks of granular chains, reducing the effective density compared to granular crystals by selectively placing wave guiding chains to control the acoustic wave transmission. The rapid wave front amplitude decay exhibited by these granular networks makes them highly attractive for impact mitigation applications. The agreement between experiments, numerical simulations, and applicable theoretical predictions validates the wave guiding capabilities of these engineered granular crystals and networks and opens a wide range of possibilities for the realization of increasingly complex granular material design.

Heterodimerization of integrin Mac-1 subunits studied by single-molecule imaging

Heterodimerization of integrin Mac-1 (alpha(M) beta(2)) Subunits plays important role on regulating leukocytes adhesion to extracellular matrix or endothelial cells. Here, using total internal reflection microscopy, we investigated the heterodimerization of integrin Mac-1 subunits at the single-molecule level in live cells. Individual alpha(M) subunit fused to the enhanced yellow fluorescent protein (eYFP) was imaged at the basal plasma membrane of live Chinese hamster ovary (CHO) cells. Through analysis of mean square displacement (MSD), diffusion coefficient, the size of restricted domain and fraction of molecules undergoing restricted diffusion, we found that as compared with the diffusion in the absence of beta(2) subunit, the diffusion of single-molecule of alpha(M)-YFP was suppressed significantly in the presence of beta(2) subunit. Thus, based on the oligomerization-induced trapping model, we suggested that in the presence of beta(2) subunit, the am subunit may form heterodimer with it. (C) 2008 Elsevier Inc. All rights reserved.

Isolation and characterization of proteins that bind to yeast origins of DNA replication

Yeast chromosomes contain sequences called ARSs which function as origins of replication in vitro and in vivo. We have carried out a systematic deletion analysis of ARS1, allowing us to define three functionally distinct domains, designated A, B, and C. Domain A is a sequence of 11 to 19bp, containing the core consensus element that is required for replication. The core consensus sequence, A/TTTTATPuTTTA/T, is conserved at all ARSs sequenced to date. A fragment containing only element A and 8 flanking nucleotides enables autonomous replication of centromeric plasmids. These plasmids replicate very inefficiently, suggesting that flanking sequences must be important for ARS function. Domain B also provides important sequences needed for efficient replication. Deletion of domain B drastically increases the doubling times of transformants and reduces plasmid stability. Domain B contains a potential consensus sequence conserved at some ARSs which overlaps a region of bent DNA. Mutational analysis suggests this bent DNA may be important for ARS function. Deletion of domain C has only a slight effect on replication of plasmids carrying those deletions.

We have identified a protein called ARS binding factor I (ABF-I) that binds to the HMR-E ARS and ARS1. We have purified this protein to homogeneity using conventional and oligonucleotide affinity chromatography. The protein has an apparent molecular weight of 135kDa and is present at about 700 molecules per diploid cell, based on the yield of purified protein and in situ antibody staining. DNaseI footprinting reveals that ABF-I binds sequence-specifically to an approximately 24bp sequence that overlaps element Bat ARSl. This same protein binds to and protects a similar size region at the HMR-E ARS.

We also find evidence for another ARS binding protein, ABF-III, based on DN asei footprint analysis and gel retardation assays. The protein protects approximately 22bp adjacent to the ABF-I site. There appears to be no interaction between ABF-I and ABF-III despite the proximity of their binding sites.

To address the function of ABF-I in DNA replication, we have cloned the ABF-I gene using rabbit polyclonal anti-sera and murine monoclonal antibodies against ABF-I to screen a λgt11 expression library. Four EcoRI restriction fragments were isolated which encoded proteins that were recognized by both polyclonal and monoclonal antibodies. A gene disruption can now be constructed to determine the in vivo function of ABF-I.

Amara Berri Sistemaren Baliagarritasuna Aztertzen

XX. mendean eman zen hezkuntza sistemaren aldaketa dela eta agertutako “Eskola Berria”ren mugimenduaren barnean dagoen Amara Berri Sistema mugimendu garrantzitsua eta oso berritzailea da. Hezkuntza kalitatea hobetzeko nahiarekin, hogei hezkuntza zentro baino gehiagok lan-sare bat osatzen dute, non sistema honen finkatzeari eta garapenari erreferentzia egiten dioten helburuak ezartzen diren. Ikerketa lan honetan ikasleen kalifikazio akademikoak eta irakasleek Amara Berri Sistemaren gainean duten pertzepzioa ageri dira. Horrela, Amara Berri Sistemak eskolari eta bertako kideei dakarkien onurak anitzak direla eta egiaztaturik daudela baieztatzen dugu.

Angelman sindromea hezkuntzaren ikuspuntutik

Bai gizartean zein hezkuntzan ezaugarri, testuinguru, garapen, behar, interes eta zailtasun desberdinak dituzten ikasleak aurkituko ditugu eta hezkuntzak erantzun inklusibo baten hautua egin behar du aniztasun honen aurrean. Badaude, ordea, ezkutuan, itzalean eta isilean geratzen diren haurrak, beraien beharrei behar bezala erantzuten ez zaienak eta hezkuntza duin bat mugatuta dutenak. Hauek, gaixotasun arraroak dituzten ikasleak dira. Angelman sindromea gaixotasun arraroa da eta lan honen helburua ikasle hauen errealitatea biluztea, kaleratzea eta manifestatzea da. Beraien egunerokotasuneko oztopo eta beharrak ezagutu eta hauei erantzun esanguratsu bat emateko ikerketa da hurrengo hau, bilaketa bibliografiko baten bidez burututakoa. Ikasle hauen hitz egiteko ezintasuna aintzat hartuz, komunikazioaren mundu ezezagun batetan murgiltzeko aukera eskaintzen diguna. Haur hauen isiltasuna garrasi bihurtuko duen lana.

Animalien Bitartezko Esku Hartzea Eskolan

Gaur egungo umeak naturatik urrun eta deskonektatuta bizi dira eta honek izakionganako ondorioak dakartza. Hezkuntza sistema eta mundu natural errealaren arteko lotura eza honen eraginez sortutako emozio desorekak ezagututa, natura eskola eremura gerturatzea erabaki nuen. Balooren laguntzarekin Animalien Bitartezko esku hartze batzuk bizi izan genituen eskolako bi urteko gelan. Txakurraren bitartez umeak emozioak azaleratzearen momentu preziatu bat izan zuten, non errespetua, konfiantza, ziurtasuna, maitasuna eta enpatia moduko kontzeptuak garatu zituzten. Esperientzia hau bizi izandako guztiontzat aberasgarria izan zen arren, onartu beharra dago behar bereziak dituzten umeen arteko bizipenak benetan harrigarriak izan zirela.

La ansiedad en el aprendizaje de segundas lenguas

[SPA] El objetivo de este Trabajo de Fin de Grado es realizar una investigación sobre cómo afecta la ansiedad en el proceso de aprendizaje de segundas lenguas y posteriormente ofrecer técnicas o estrategias para combatir dicha ansiedad. CASTELLANO

Aurreiritzietatik Kulturartekotasunera

[EUS] Joseba Sarrionandiak (2013, 224) “Batzuetan egunkarian munduan gertatzen den guztia irakurtzen da eta munduan geratzen den guztia, munduan geratzen den guztia sinestea da” hitzekin eman zion hasiera poema bati. Honekin adierazi nahi duguna da milaka ikuspuntu daudela errealitate baten baitan. Lan honen helburua da, ikuspuntu guztiak antzematea ezinezkoa delako, aurretiaz ditugun ikuspuntuak baztertzea aurrean duguna era objektiboz baloratu ahal izateko. Hau da, aurretiaz aurrean dugunaz dakiguna desikastea, aurrean dugun horretaz ikasteko. Gauzatutako inkesta baten bitartez ikusi dugu ezagutzen ez dugunaren gain iritziak ditugula (aurreiritziak) eta ezagutu genuena ezagutu beharko genukeena baldintzatzen duela (estereotipoak). Beraz, marko teorikoan oinarritutako inkesta baten emaitzetan babestu gara desikasi prozesua martxan jarriko duen dokumental bat egiteko eta ikasi prozesuaren hastapena izango den gida bat gauzatzeko.