Littérature scientifique sur le sujet « Fréquences THz »
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Articles de revues sur le sujet "Fréquences THz"
Vigne, Nathan, Baptiste Chomet, Alaeddine Abbes, Mohamed Seghilani, Stéphane Blin, Mikhael Myara, Grégoire Beaudoin et al. « États originaux de la lumière par structuration 3D de l’émission D’un laser à Métasurface ». Photoniques, no 109 (juillet 2021) : 46–50. http://dx.doi.org/10.1051/photon/202110946.
Texte intégral-Brunel, M. « Génération de battements GHz ou THz au moyen de lasers bi-fréquences ». Revue de l'Electricité et de l'Electronique -, no 01 (2003) : 37. http://dx.doi.org/10.3845/ree.2003.004.
Texte intégralBelgasmi, I., et M. Hamimid. « Accurate Hysteresis Loops Calculation Under the Frequency Effect Using the Inverse Jiles-Atherton Model ». Advanced Electromagnetics 9, no 2 (12 novembre 2020) : 93–98. http://dx.doi.org/10.7716/aem.v9i2.1515.
Texte intégralDIAKITE, Mamady, et Et Al. « Paludisme chez les drépanocytaires de forme majeurs : aspects épidémiologiques, cliniques, thérapeutiques et évolutif au service d’hématologie de l’hôpital national Ignace Deen de Conakry ». Revue Malienne d'Infectiologie et de Microbiologie 16, no 3 (12 janvier 2022) : 36–40. http://dx.doi.org/10.53597/remim.v16i3.2026.
Texte intégralOgbanya, K. C., C. A. Eze, N. H. Okereke et C. K. Chukwu. « Assessment of changes in physiological parameters and immune marker levels in cattle presented for slaughter at Ikpa Nsukka slaughter abattoir ». Nigerian Journal of Animal Production 48, no 3 (6 mars 2021) : 204–9. http://dx.doi.org/10.51791/njap.v48i3.2959.
Texte intégralWu, Robert, Vikas Patel, Sabreena Moosa, Laura Langer, Thomas MacMillan, Rodrigo Cavalcanti, Peter Cram, Keith Gunaratne et Mark Bayley. « Fitbit Data Show Poor Correlation with Measures of Activity and Sleep among Hospitalized General Medicine Patients ». Canadian Journal of General Internal Medicine 17, no 4 (18 novembre 2022) : 38–47. http://dx.doi.org/10.22374/cjgim.v17i4.616.
Texte intégralMoutaouakkil, Youssef, Hicham Fettah, Sara Rharrit, Sanaa Lhajoui, Jamal Elmssaouri, Ahmed Bennana et Sanaa Makram. « Immunotherapy in the treatment of cancer ». Batna Journal of Medical Sciences (BJMS) 2, no 2 (30 décembre 2012) : 147–52. http://dx.doi.org/10.48087/bjmsra.2015.2210.
Texte intégralMiller, William Ian. « Some aspects of householding in the medieval Icelandic commonwealth ». Continuity and Change 3, no 3 (décembre 1988) : 321–55. http://dx.doi.org/10.1017/s0268416000004276.
Texte intégralGalati, Dario, Renato Miceli et Marco Tamietto. « Emotions and feelings in the Bible : analysis of the Pentateuch's affective lexicon ». Social Science Information 46, no 2 (juin 2007) : 355–76. http://dx.doi.org/10.1177/0539018407076653.
Texte intégralYoussouf, Oumarou, Eudes Habib Evrard Mafata Ngonvon, JM Bambe Ouati et Serge Magloire Camengo Police. « Les Anomalies en Endoscopies Digestives Hautes à Bangui ». European Scientific Journal, ESJ 8 (25 août 2022) : 257. http://dx.doi.org/10.19044/esj.2022.v8n0p257.
Texte intégralThèses sur le sujet "Fréquences THz"
Loghmari, Zeineb. « Lasers à cascades quantiques InAs / AISb au-delà de 10µm : émission mono-fréquence et génération du THz par différence de fréquences ». Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS088.
Texte intégralApplications such as gas spectroscopy or medical imaging require light sources emitting in the mid- and far infrared (10 µm<λ < 28 µm) as well as in the THz (λ > 60µm). High-performance, continuous wave regime (CW) and single-frequency emission components are essential for this type of application. Quantum cascade lasers (QCLs) are the only sources that can cover this wide range of wavelengths thanks to their inter-sub-band transitions. However, the performance of LCQs in this wavelength range is often limited by non-radiative transitions. The latter generate mechanisms such as photon absorption by TO phonons or electron relaxation by LO phonons. As a result, laser emission in CW and at room temperature becomes particularly difficult. The objective of this thesis is the development of InAs/AlSb LCQs above 10 µm for single-frequency emission and THz generation by frequency difference. A key point in this work is the use of the InAs/AlSb material system. Their advantage is based on the low effective mass. It is 0.023m0 for InAs compared to 0.041m0 for InGaAs and 0.067m0 in GaAs.First, the development of LCQ active regions based on InAs/AlSb emitting at 11µm was carried out. This work made it possible to produce single-frequency DFB sources emitting continuously at 295K and which were used in QEPAS spectroscopy for ethylene sensing. This LCQ has also been transferred to Silicon (Si) substrate. He has demonstrated the world's most efficient LCQ grown directly on Si substrate. The wavelength range ≥ 11µm was also explored. First, by using a dielectric waveguide where this study leads to an active region design at 20µm whose performances exceed the state of the art in the world with continuous operation up to 240K. Then, these technologies were also exploited by using metal-metal waveguides. In this part, the limits of this waveguide were tested. This made it possible to produce a dual-frequency DFB CQL with a metal-metal waveguide emitting two wavelengths in the far infrared for the generation of THz by difference frequency. In this context, the non-linearity of this type of active region has been optimized. The extraction of the THz wave was also studied
Zakharenko, Olena. « Spectroscopie THz de molécules atmosphériques : application à l'étude de composés organiques volatils ». Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10018/document.
Texte intégralWe present the molecular spectroscopy results with the experimental developments and the analyses of high resolution spectra of molecules of atmospheric interest. We set up and tested a new frequency multiplication chain intended to extend the range of THz spectrometer in the PhLAM laboratory. The important parameters of the spectrometer, such as sensitivity, measurement precision and harmonic composition of the radiation source, were characterized using the rotational spectra of two simple molecules: formaldehyde and carbon monoxide. The extended analysis of rotational structure of HDCO, D2CO and 13C, 17O, 18O, and 13C18O isotopic species is also presented.Furthermore we studied the millimeterwave and terahertz rotational spectrum of 3 significant atmospheric molecules: methacrolein and methyl vinyl ketone, the main oxidation products of isoprene, and ethyl nitrite, a combustion product of alcohol based fuels and of photochemical oxidation of volatile organic compounds. These complex molecules are characterized by different large amplitude motions. In particular, the methyl group torsion was modeled in the experimental accuracy for the ground and the lowest excited vibrational states for methacrolein and methyl vinyl ketone. We thus provide an essential information for the detailed analysis of infrared spectra, recorded by high-resolution infrared spectroscopy, in the atmospheric windows
Cardenas, Nieto Jairo Ricardo. « Modélisation et optimisation de l’émission THz par des oscillations de Bloch ». Paris 6, 2010. http://www.theses.fr/2010PA066383.
Texte intégralBernard, Vincent. « Stabilisation en fréquence de lasers à CO² en dessous du Hertz : application à la métrologie des fréquences dans la région spectrale de 30 THz ». Paris 6, 1997. http://www.theses.fr/1997PA066762.
Texte intégralIskandar, Zyad. « Système de formation de faisceau dans la bande 300 GHz en technologie BiCMOS 55nm pour l’imagerie THz ». Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT072/document.
Texte intégralThe sub-millimeter wave band that covers the frequency range from 300 GHz to 3 THz has an interesting properties such the ability to penetrate materials. For THz imaging, it is possible to detect objects inside packages, clothes... With the evolution of integrated technologies and the increase of the cut-off frequencies of transistors 〖(f〗_t/f_max), many circuits and systems have been fabricated around 300 GHz, especially phased arrays for beamforming applications. These systems generate a signal and steer it electronically in a direction of the space. In this work, a novel architecture of phased array is proposed. It is based on the generation of a signal in the 270-300 GHz band, while controlling its phase by using phase shifters implemented in the LO path in the 45-50 GHz band. Each bloc should be measured in a stand-alone version, in order to get an idea about whole system performances. For this, the transmitter in the 270-300 GHz band has been realized first. It consists of a sub-harmonic injection locked oscillator, a passive mixer and IF amplifiers. Then, a novel architecture of phase shifter was proposed, it is based on slow waves coupled lines. Finally, a frequency multiplier chain was performed to generate the injection signal by using a lower frequency signal (3-5 GHz). The circuits are fabricated in a 55nm BiCMOS technology from STMicroelectronics. Measurements results are in a good agreement with simulations. Once the blocks are validated, sub systems are realized in order to validate one path of the array. The perspectives of this work include the design and realization of the complete phased array with multiple paths/antennas
Lai, Ngoc Diep. « Etude théorique et expérimentale des lasers solides bi-fréquences dans les domaines GHz à THz, en régime continu ou impulsionnel ». Phd thesis, Rennes 1, 2003. https://tel.archives-ouvertes.fr/tel-00410958.
Texte intégralGacemi, Djamal Eddine. « Étude expérimentale et simulation des modes électromagnétiques se propageant sur des guides d’ondes métalliques de petites dimensions aux fréquences THz ». Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112413.
Texte intégralFocusing optical energy into a small spot diameter much smaller than the diffraction limit has long been a very interesting topic in photonics. In Terahertz (with a wavelength of about 300 microns) this challenge is particularly important to meet the growing interest in high-resolution imaging and spectroscopy of materials whose size is smaller than the wavelength in free space. In my thesis, I studied the confinement of surface waves at THz frequencies on metal structures with sub-wavelength dimensions . I experimentally measured the confinement of the electric field and calculated the dispersion relation of the surface mode on a metal structure deposited on a low permittivity dielectric substrate. These measurements are obtained using a guided-wave time domain spectroscopy set-up, developed during my PhD. The measurement is made by a near-field freely positionable electro-optical probe. These experimental results are supplemented by numerical simulations obtained by finite element analysis software Comsol Multiphysics. The experimental results show a confinement of λ/20 of the EM surface mode on a sub-wavelength dimension rectangular metal wire
Jung, Cécile. « Conception et fabrication de circuits intégrés basés sur les nano-diodes Schottky GaAs fonctionnant aux fréquences THz et sub-THz pour les récepteurs hétérodynes spatiaux dédiés à l'astrophysique ». Paris 11, 2009. http://www.theses.fr/2009PA112240.
Texte intégralThe objective of this thesis is to design and integrate circuits mixers at 330GHz and 183GHz for heterodyne detection in astrophysics. These circuits are based on Schottky diodes, allowing operation at room temperature. The main point of the thesis is to develop a protocol for fabrication of submicron Schottky diodes and to integrate them in circuits mixers. These circuits are integrated in a test block and characterized in terms of RF performances. This thesis work may be used for circuits at higher frequencies, for both mixers and multipliers. A fabrication process entirely based on electron beam lithography has been developed, allowing the realization of Schottky diodes with submicronic anodes and improvement of their electrical characteristics. Many studies for specific optimization of the ohmic and schottky contacts have yielded to series resistances below 10Ω and to best ideality factors between 1,08 and 1,15. Two types of circuits have been made. One for operation at 330GHz composed of a pair of anti-parallel anodes on a 10μm membrane. The other, for a frequency of 183GHz, consists of a MMIC circuit including a pair of anti-parallel anodes on a 50μm membrane. One of the components to 330GHz has been integrated into a mixer bloc, its RF performances have been characterized. The preliminary result was encouraging with a noise temperature of 1800K for a conversion loss of 8dB
Moron, Guerra José. « Design of Sub-THz heterodyne receivers in 65 nm CMOS process ». Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10053/document.
Texte intégralThe main goal of this thesis is to explore design opportunities beyond the millimeter wave frequencies and to get as close as possible to the THz band using CMOS technologies. The main application is the heterodyne detection for THz imaging. The cut-off frequencies ft/fmax of the used process (65 nm CMOS) are 150/205 GHz, the chosen operation frequency of the developed systems is 280 GHz which means that the circuits developed during this thesis operate at least 80 GHz beyond their fmax cut-off frequency. Two 280 GHz sub-harmonic injection locked oscillators were developed, the injection frequency corresponds to one sixth of the ouput frequency. In order to generate oscillations beyond fmax, harmonic boost techniques are used such as the push-push and triple push techniques. The output power of the oscillators are - 19 and - 14 dBm at 280 GHz. Both components were used as local oscillators for two heterodyne receivers operating around the same frequency. In order to down-covert the Sub-THz signal, a passive resistive mixer is used; this kind of circuit allows mixing beyond the active transistor limits. Also there is no LNA at the begining of the Rx chain since the cut-off frequencies are very low and there will be no gain for amplification at 280 GHz. The conversion gain of both receivers is - 6 dB however the NF's are 36 dB and 30 dB. The best receiver (30 dB) is co-integrated with an antenna (developed by Labsticc) using the same process allowing heterodyne detection THz imaging
Acef, Mohand Ouali. « Améliorations et comparaisons d'étalons de fréquences optiques : développement d'un spectromètre à très haute résolution autour de 28 THz et application à la spectroscopie de SF6 ». Paris 11, 1989. http://www.theses.fr/1989PA112052.
Texte intégralLivres sur le sujet "Fréquences THz"
Canada. Dept. of Foreign Affairs and International Trade. Radio : exchange of notes constituting an agreement amending the agreement between the Government of Canada and the Government of the United States of America on the use of the 88 to 108 megahertz band for frequency modulation broadcasting (FM), done at Washington on February 25, 1991 (with annexes), Washington, July 9, 1997, in force July 9, 1997 = : Radio : échange de notes constituant un accord modifiant l'accord entre le gouvernement du Canada et le gouvernement des États-Unis d'Amérique sur l'utilisation de la bande de fréquences de 88 à 108 mégahertz pour la radiodiffusion en modulation de fréquence (FM), fait à Washington le 25 février 1991 (avec annexes), Washington, le 9 juillet 1997, en vigueur le 9 juillet 1997. Ottawa, Ont : Queen's Printer = Imprimeur de la Reine, 1998.
Trouver le texte intégralForstmann, F. Metal optics near the plasma frequency. Berlin : Springer-Verlag, 1986.
Trouver le texte intégralCommon Market for Eastern and Southern Africa. FAQ : Answers to the most frequently Asked Questions about the COMESA Customs Union = Réponses aux questions les plus fréquentes au sujet de l'Union douanière du COMESA. Lusaka, Zambia : Common Market for Eastern and Southern Africa, 2012.
Trouver le texte intégralNeumann, Kenneth J. The authenticity of the Pauline Epistles in the light of stylostatistical analysis. Atlanta, Ga : Scholars Press, 1990.
Trouver le texte intégralAndersen, Francis I. The vocabulary of the Old Testament. Roma : Pontificio Istituto biblico, 1989.
Trouver le texte intégralStig, Johansson. Frequency analysis of English vocabulary and grammar : Based on the LOB corpus. Oxford [England] : Clarendon Press, 1989.
Trouver le texte intégralCanada. Dept. of Foreign Affairs and International Trade. Telecommunications - television : exchange of notes between the Government of Canada and the Government of the United States of America constituting an agreement concerning the use of frequency bands for television broadcasting and the associated working arrangement (with annexes), Washington, November 3, 1993 and January 5, 1994, in force January 5, 1994 = : Télécommunications - télévision : échange de notes entre le gouvernement du Canada et le gouvernement des États-Unis d'Amérique constitutant un accord concernant l'utilisation des bandes de fréquence pour la télédiffusion et l'entente officieuse s'y rapportant (avec annexes), Washington, le 3 novembre 1993 et le 5 janvier 1994, en vigueur le 5 janvier 1994. Ottawa, Ont : Queen's Printer = Imprimeur de la Reine, 1998.
Trouver le texte intégralSurbeck, Martin, et Gottfried Hohmann. Affiliations, aggressions and an adoption : Male–male relationships in wild bonobos. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198728511.003.0003.
Texte intégralForbes, Dean A., et Francis I. Andersen. Vocabulary of the Old Testament. Loyola Pr, 1993.
Trouver le texte intégralThe Use of words in context : The vocabulary of college students. New York : Plenum Press, 1985.
Trouver le texte intégralChapitres de livres sur le sujet "Fréquences THz"
Nørgaard, Lars Cyril. « “The Secret Sin That One Commits by Thought Alone” : Confession as Private and Public in Seventeenth-Century France ». Dans Tracing Private Conversations in Early Modern Europe, 205–33. Cham : Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-46630-4_8.
Texte intégralLe Moigne, Philippe. « Une tournure syntaxique fréquente en Ésaïe-LXX : Substantif abstrait + λήμψεται + complément d’objet direct ». Dans The Legacy of Soisalon-Soininen, 119–38. Göttingen : Vandenhoeck & Ruprecht, 2020. http://dx.doi.org/10.13109/9783666564871.119.
Texte intégral« The Frequency Dictionary Das Frequenzwörterbuch Le dictionnaire de fréquences ». Dans Wörterbücher / Dictionaries / Dictionnaires, Part 2, sous la direction de Franz Josef Hausmann, Oskar Reichmann, Herbert Ernst Wiegand et Ladislav Zgusta. Berlin • New York : Walter de Gruyter, 1990. http://dx.doi.org/10.1515/9783110124200.2.12.1314.
Texte intégral« Diafrequente Markierungen im allgemeinen einsprachigen Wörterbuch Frequency Labels in the General Monolingual Dictionary Les marques de fréquence dans le dictionnaire monolingue ». Dans Wörterbücher / Dictionaries / Dictionnaires, Part 1, sous la direction de Franz Josef Hausmann, Oskar Reichmann, Herbert Ernst Wiegand et Ladislav Zgusta. Berlin • New York : Walter de Gruyter, 1989. http://dx.doi.org/10.1515/9783110095852.1.4.688.
Texte intégralBRETON, Justine. « Comprendre les épidémies des séries arthuriennes au regard de la pandémie de 2020 ». Dans Les épidémies au prisme des SHS, 45–54. Editions des archives contemporaines, 2022. http://dx.doi.org/10.17184/eac.5989.
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