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Elaboration d'auto-assemblages supramoléculaires de Donneurs et Accepteurs d'électrons sur Au(111) et leur étude par microscopie à Effet Tunnel couplée à une excitation laser. / Supramolecular 2D self-assembly of Donors and Acceptors on Au(111) and their study by Light-Assisted Scanning Tunneling MicroscopyLombana, Andrés Felipe 17 March 2017 (has links)
Nous présentons l'auto-assemblage 2D de molécules Donneuses (D) et Acceptrices (A) d'électrons sur Au(111), ainsi que leur étude par un dispositif de Microscopie à Effet Tunnel couplé à une excitation lumineuse (LA-STM). Dans un premier temps, des systèmes 2D supramoléculaires robustes (liaisons hydrogène) D et/ou A ont été élaborés par un procédé en solution. Des liaisons hydrogène sont mises en évidence sur un assemblage d'un dérivé de porphyrine (D) pouvant en établir plusieurs, montrant le lien entre les liaisons établies et la géométrie obtenue. D'autre part, un réseau poreux "hôte" à base de molécules de PTCDI (A) et de mélamine est utilisé pour diriger la croissance de molécules "invitées" à l'intérieur des pores. Des systèmes hôte-invités sont alors élaborés en utilisant soit un dérivé thiolé de porphyrine (D), soit un polyoxométalate (POM). Une étude infrarouge de surface (PM-IRRAS) montre en plus que le réseau a une influence différente sur le processus d'organisation des deux molécules.Dans un deuxième temps, la mise en place d'un dispositif de LA-STM est décrite, avec une étude réalisée sur une bicouche moléculaire D/A constituée d'un polymère (PTB7) et d'un dérivé de fullerène (PC71BM). Premièrement, les effets photo-physiques, non spécifiques aux molécules et inhérents à la technique, ont été étudiés. Cela a permis de mesurer le courant à potentiels opposés DI=I(V+)-I(V-), attribué aux transferts de charge aux jonctions D/A. La localisation de ce courant permet d'identifier les jonctions D/A actives en surface avec une résolution nanométrique. / We present the 2D self-assembly of molecular electron Donors (D) and Acceptors (A) on Au(111) and their study by Light-Assisted Scanning Tunneling Microscopy (LA-STM). Firstly, hydrogen bonded supramolecular assemblies are elaborated from solutions. On one hand, a the self-assembly of a porphyrin derivative (D) show the relationship between the established hydrogen bonds and the obtained geometry. On the other hand, a PTCDI-melamine porous host network was used to template the growth of guest molecules within the pores. Host-guest systems are then elaborated using a thiolated porphyrin derivative and a polyoxometalate (POM) molecule. A surface infrared analysis (PM-IRRAS) shows that the network has different effects on the growth process and orientation angles of the two molecules.Secondly, we developed a LA-STM setup and we analysed a polymer/fullerene (PTB7/PC71BM) D/A molecular system. After the study of the photo-physical phenomena giving rise to the photo-current, we measured the current at opposite bias voltages DI=I(V+)-I(V-). We attribute this current to the photo-absorption of the molecules and to the electron transfer at the molecular D/A junctions which allows us to identify the active junctions on the surface with the nanometre resolution.
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Design of Up/Down Conversion Mixer for IEEE 802.11a ApplicationZeng, Yu-Shan 30 July 2012 (has links)
The IEEE 802.11a has become the mainstream protocol used in modern wireless communication system due to its high propagation rate of data (54 Mb/s). To meet high propagation rates, the communication devices used in IEEE 802.11a protocol usually present a high conversion gain and a high linearity (denoted as third order intercept point, IIP3). The IIP3 of conventional up- and down-conversion mixers are only about 0 dBm and -5 dBm, which fail to achieve a high propagation rate of data. This thesis utilizes the TSMC 0.18 µm CMOS technology to design and fabrication up- and down-conversion mixers with very high linearity for IEEE 802.11a application.
The proposed high-linearity up-conversion mixer with 1.01 mm ¡Ñ 0.85 mm chip size and its wide bandwidth (5~6 GHz) is well suited for IEEE 802.11a application. To enhance the linearity and bandwidth, a transconductor stage with gm-boosted structure, a switch stgae with LO-body grounded structure and a load stage with shunt peaking structure are adopted in this research. Under 5.2/5.4/5.8 GHz operating frequencies, the implemented up-conversion mixer demonstrates a high conversion gain of 6.8/7.1/6.3 dB and a high linearity of 8.9/9/13.2 dBm, respectivly. In addition, a moderate consuming power (6.86 mW) of such mixer can be achieved at 1.2 V supply voltage.
On the other hand, this thesis also designed and fabricated a high-linearity down-conversion mixer with chip size of 1.02 mm ¡Ñ 0.86 mm and 5.2 GHz center frequency. To improve the linearity and isolation and reduce the high-order noise, a transconductor stage with dual-gate structure and a load stage with RC-tank structure are adopted in this research. According to the EM-simulation resutls, the proposed down-conversion mixer presents a moderate conversion gain of 6 dB and a high linearity of 0.8 dBm. Additionly, a moderate consuming power (6.75 mW) of such mixer can be achieved at 1.8 V supply voltage.
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« Cheminer avec Dieu » : pentecôtisme et migration à Bruxelles/« To walk with God » : Pentecostalism and migration in BrusselsMaskens, Maïté 22 June 2010 (has links)
Depuis une trentaine d’années, des Églises pentecôtistes portées par des communautés en migration ou issues de celles-ci ont fait leur apparition dans la capitale européenne. Leur implantation et leur succès grandissants vont de pair avec l’intensification des flux migratoires de ces trois dernières décennies en provenance d’Afrique sub-saharienne et d’Amérique Latine. Cette thèse entend explorer l’enchevêtrement entre l’expérience religieuse et le parcours migratoire des acteurs pentecôtistes euro-africains et euro-latinoaméricains à Bruxelles. Dans ces espaces, les convertis travaillent collectivement à réaliser la transformation encouragée par le scénario religieux qui consiste à appliquer le « plan parfait de Dieu » dans leur vie. Porteurs d’ambitions missionnaires, les fidèles donnent des contenus inédits à leur posture identitaire en redéfinissant la place qui leur est assignée dans le contexte de la Belgique postcoloniale. L’affiliation religieuse joue comme un marqueur de distinction, processus qui est particulièrement saillant dans le domaine de la sexualité et des rapports de genre entretenus à l’intérieur même des assemblées./During the past thirty years, Pentecostal churches, mostly composed by followers from Subsaharan Africa and Latin America, blossomed in Brussels. Their presence and growing success go hand in hand with the intensification of the migratory flows, the last three decades, from these two continents. This thesis investigates the relationship between the religious experience and the migratory route of the euro-African and euro-Latin-American Pentecostal actors in Brussels. In these meeting spaces, the converts work collectively to realise the transformation process encouraged by the religious scenario which consists in applying the perfect " plan of God " to their life. Carriers of missionary ambitions, the believers give new contents to their identity by redefining the place which is assigned to them in the context of post-colonial Belgium. The religious membership operates as a marker of distinction, a process which is particularly striking in the field of sexuality and gender relation maintained within the assemblies.
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Design of Up/Down Conversion Mixer for IEEE 802.11a ApplicationZeng, Yu-Shan 01 August 2012 (has links)
The IEEE 802.11a has become the mainstream protocol used in modern wireless communication system due to its high propagation rate of data (54 Mb/s). To meet high propagation rates, the communication devices used in IEEE 802.11a protocol usually present a high conversion gain and a high linearity (denoted as third order intercept point, IIP3). The IIP3 of conventional up- and down-conversion mixers are only about 0 dBm and -5 dBm, which fail to achieve a high propagation rate of data. This thesis utilizes the TSMC 0.18 £gm CMOS technology to design and fabrication up- and down-conversion mixers with very high linearity for IEEE 802.11a application.
The proposed high-linearity up-conversion mixer with 1.01 mm ¡Ñ 0.85 mm chip size and its wide bandwidth (5~6 GHz) is well suited for IEEE 802.11a application. To enhance the linearity and bandwidth, a transconductor stage with gm-boosted structure, a switch stgae with LO-body grounded structure and a load stage with shunt peaking structure are adopted in this research. Under 5.2/5.4/5.8 GHz operating frequencies, the implemented up-conversion mixer demonstrates a high conversion gain of 6.8/7.1/6.3 dB and a high linearity of 8.9/9/13.2 dBm, respectivly. In addition, a moderate consuming power (6.86 mW) of such mixer can be achieved at 1.2 V supply voltage.
On the other hand, this thesis also designed and fabricated a high-linearity down-conversion mixer with chip size of 1.02 mm ¡Ñ 0.86 mm and 5.2 GHz center frequency. To improve the linearity and isolation and reduce the high-order noise, a transconductor stage with dual-gate structure and a load stage with RC-tank structure are adopted in this research. According to the EM-simulation resutls, the proposed down-conversion mixer presents a moderate conversion gain of 6 dB and a high linearity of 0.8 dBm. Additionly, a moderate consuming power (6.75 mW) of such mixer can be achieved at 1.8 V supply voltage.
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Understanding non-Pauline conversions in Luke-Acts with an eye to the blurring of ritual boundariesHelvig, Mikkin B. Steltenkamp. January 2008 (has links)
Thesis (M.A.)--Denver Seminary, 2008. / Includes bibliographical references (leaves 140-149).
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Environmental effects of multi-stage flash (MSF) desalination plant at Al-Jubail, Saudi Arabia /Ahmad, Mansoor, January 2002 (has links)
Thesis (M.Eng.)--Memorial University of Newfoundland, 2002. / Bibliography: leaves 144-150.
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Ad Quirinum book three and Cyprian's catechumenateAlexis-Baker, Andy. January 2007 (has links)
Thesis (M.A.)--Associated Mennonite Biblical Seminary, 2007. / Includes bibliographical references (leaves 114-123).
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Ad Quirinum book three and Cyprian's catechumenateAlexis-Baker, Andy. January 2007 (has links)
Thesis (M.A.)--Associated Mennonite Biblical Seminary, 2007. / Includes bibliographical references (leaves 114-123).
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Evangelical conversion and Latin American masculinitySantos, Jose Leonardo. January 2008 (has links)
Thesis (Ph.D. in Anthropology)--S.M.U. / Title from PDF title page (viewed Mar. 16, 2009). Source: Dissertation Abstracts International, Volume: 69-12, Section: A. Adviser: Caroline Brettell. Includes bibliographical references.
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Understanding non-Pauline conversions in Luke-Acts with an eye to the blurring of ritual boundariesHelvig, Mikkin B. Steltenkamp. January 2008 (has links)
Thesis (M.A.)--Denver Seminary, 2008. / Includes bibliographical references (leaves 140-149).
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