Relevant bibliographies by topics / Photon addition

Academic literature on the topic 'Photon addition'

Author: Grafiati
Published: 10 March 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Photon addition.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Photon addition"

1

Walker, J. G. "Sub-poissonian Photon Statistics by Photon Addition." Optica Acta: International Journal of Optics 33, no. 3 (March 1986): 213–18. http://dx.doi.org/10.1080/713821940.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Hoai, Nguyen Thi Xuan, and Truong Minh Duc. "Nonclassical properties and teleportation in the two-mode photon-added displaced squeezed states." International Journal of Modern Physics B 30, no. 07 (March 18, 2016): 1650032. http://dx.doi.org/10.1142/s0217979216500326.

Full text
Abstract:
In this paper, we study the nonclassical properties and find out the effect of photon addition on these properties as well as the process of teleportation in the two-mode photon-added displaced squeezed (TMPADS) states. We derive the analytic expressions of the Wigner function, the photon number distribution and the intermode photon antibunching for these states. We show that photon addition operation not only makes the Wigner function become negative but also leads to increase the degree of antibunching. The peak of the photon number distribution becomes flatter and shifts to the greater number of photons by adding photons to both modes simultaneously. Furthermore, it is proved that the degree of intermodal entanglement becomes bigger and bigger through increasing the number of photons added to both modes. As expected, when using these states as an entanglement resource to teleport a state, the average fidelity of teleportation process is also improved by increasing the number of added photons.
APA, Harvard, Vancouver, ISO, and other styles
3

Filippov, S. N. "On Quantum Operations of Photon Subtraction and Photon Addition." Lobachevskii Journal of Mathematics 40, no. 10 (October 2019): 1470–78. http://dx.doi.org/10.1134/s199508021910010x.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Jang, Jae-Young, and Myungjin Cho. "Lensless Three-Dimensional Imaging under Photon-Starved Conditions." Sensors 23, no. 4 (February 20, 2023): 2336. http://dx.doi.org/10.3390/s23042336.

Full text
Abstract:
In this paper, we propose a lensless three-dimensional (3D) imaging under photon-starved conditions using diffraction grating and computational photon counting method. In conventional 3D imaging with and without the lens, 3D visualization of objects under photon-starved conditions may be difficult due to lack of photons. To solve this problem, our proposed method uses diffraction grating imaging as lensless 3D imaging and computational photon counting method for 3D visualization of objects under these conditions. In addition, to improve the visual quality of 3D images under severely photon-starved conditions, in this paper, multiple observation photon counting method with advanced statistical estimation such as Bayesian estimation is proposed. Multiple observation photon counting method can estimate the more accurate 3D images by remedying the random errors of photon occurrence because it can increase the samples of photons. To prove the ability of our proposed method, we implement the optical experiments and calculate the peak sidelobe ratio as the performance metric.
APA, Harvard, Vancouver, ISO, and other styles
5

Melde, T. "A photon number density operator in the covariant formulation of quantum electrodynamics." Canadian Journal of Physics 77, no. 3 (July 1, 1999): 167–75. http://dx.doi.org/10.1139/p99-018.

Full text
Abstract:
We introduce a new photon number density operator in the Gupta-Bleuler quantized photon field and show that the corresponding total number operator counts transverse photons in the new model. It is also shown that the suggested operator interpreted in the usual Hilbert space counts, in addition, a number of gauge photons for the free field. In the case of two fixed charges it also counts an extra number of scalar photons due the charges.PACS Nos.: 12.20.-m, 14.70.Pw, 42.50.Ar
APA, Harvard, Vancouver, ISO, and other styles
6

Sivakumar, S. "Truncated Coherent States and Photon-Addition." International Journal of Theoretical Physics 53, no. 5 (January 5, 2014): 1697–709. http://dx.doi.org/10.1007/s10773-013-1967-7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Nomerotski, A., M. Chekhlov, D. Dolzhenko, R. Glazenborg, B. Farella, M. Keach, R. Mahon, D. Orlov, and P. Svihra. "Intensified Tpx3Cam, a fast data-driven optical camera with nanosecond timing resolution for single photon detection in quantum applications." Journal of Instrumentation 18, no. 01 (January 1, 2023): C01023. http://dx.doi.org/10.1088/1748-0221/18/01/c01023.

Full text
Abstract:
Abstract We describe a fast data-driven optical camera, Tpx3Cam, with nanosecond scale timing resolution and 80 Mpixel/sec throughput. After the addition of intensifier, the camera is single photon sensitive with quantum efficiency determined primarily by the intensifier photocathode. The single photon performance of the camera was characterized with results on the gain, timing resolution and afterpulsing reported here. The intensified camera was successfully used for measurements in a variety of applications including quantum applications. As an example of such application, which requires simultaneous detection of multiple photons, we describe registration of photon pairs from the spontaneous parametric down-conversion source in a spectrometer. We measured the photon wavelength and timing with respective precisions of 0.15 nm and 3 ns, and also demonstrated that the two photons are anti-correlated in energy.
APA, Harvard, Vancouver, ISO, and other styles
8

Kosson, D. Sc, Robert L. "The effect of gravitational field on photon frequency:a fresh look at the photon." Physics & Astronomy International Journal 6, no. 1 (March 9, 2022): 28–29. http://dx.doi.org/10.15406/paij.2022.06.00246.

Full text
Abstract:
The purpose of this paper is to present a new description of the photon. The photon is postulated to be a rotating dipole, consisting of two masses, one with a positive charge and the other a negative charge. This conceptualization of the photon permits a parsimonious explanation of both the wave and particle properties of light while providing a straightforward hypothesis for the increased red shift associated with the early stages of the universe. In addition, if measurements could be made of the red shift associated with photons being drawn into a black hole, such measurements might aid in estimating the strength of the associated gravitational gradient.
APA, Harvard, Vancouver, ISO, and other styles
9

Stumpf, H. "Simultaneous Formation of Electric and Magnetic Photon States by Electroweak Symmetry Breaking." Zeitschrift für Naturforschung A 59, no. 4-5 (May 1, 2004): 185–95. http://dx.doi.org/10.1515/zna-2004-4-501.

Full text
Abstract:
In order to describe the electromagnetic effects (fields) of simultaneously occurring electric and (hypothetical fermionic) magnetic monopoles, Cabibbo and Ferrari introduced in addition to the conventional electric vector potential a magnetic vector potential, thus leading to electric and magnetic photons. A theoretical confirmation (and justification) of this phenomenological ansatz is provided by the manifold of photon states in de Broglie’s theory of fusion. Lochak showed that in this theory either electric or magnetic photon states can be derived. To study the possibility of the simultaneous existence of electric and magnetic photon states a modern version of de Broglie’s fusion theory is used, which is formulated by means of generalized de Broglie-Bargmann-Wigner equations. It is demonstrated that the corresponding photon equations admit the simultaneous existence of electric and magnetic photon states if the electroweak SU(2)- and CP-symmetry breakings are introduced into these equations. The latter symmetry violations induce violations of the permutation symmetry, which is crucial for the proof of Cabibbo’s and Ferrari’s hypothesis referred to photons with partonic substructure.
APA, Harvard, Vancouver, ISO, and other styles
10

Yeo, Gilsu, and Myungjin Cho. "Three-Dimensional Digital Zooming of Integral Imaging under Photon-Starved Conditions." Sensors 23, no. 5 (February 28, 2023): 2645. http://dx.doi.org/10.3390/s23052645.

Full text
Abstract:
In this paper, we propose new three-dimensional (3D) visualization of objects at long distance under photon-starved conditions. In conventional three-dimensional image visualization techniques, the visual quality of three-dimensional images may be degraded because object images at long distances may have low resolution. Thus, in our proposed method, we utilize digital zooming, which can crop and interpolate the region of interest from the image to improve the visual quality of three-dimensional images at long distances. Under photon-starved conditions, three-dimensional images at long distances may not be visualized due to the lack of the number of photons. Photon counting integral imaging can be used to solve this problem, but objects at long distance may still have a small number of photons. In our method, a three-dimensional image can be reconstructed, since photon counting integral imaging with digital zooming is used. In addition, to estimate a more accurate three-dimensional image at long distance under photon-starved conditions, in this paper, multiple observation photon counting integral imaging (i.e., N observation photon counting integral imaging) is used. To show the feasibility of our proposed method, we implement the optical experiments and calculate performance metrics, such as peak sidelobe ratio. Therefore, our method can improve the visualization of three-dimensional objects at long distances under photon-starved conditions.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Photon addition"

1

Andriamiadamanana, Christian. "Addition de photons dans des couches nanoatructurées pour des applications en photovoltaïque." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00733872.

Full text
Abstract:
L'objectif de ce travail est d'étudier un matériau up-converteur sous différentes formes afin de pourvoir l'appliquer au photovoltaïque (cellules de 3ième génération). L'oxyde d'yttrium possédant des propriétés particulièrement intéressantes pour l'up-conversion (gap et indice de réfraction élevés, faible énergie de phonons, dopage facile) a été choisi comme matériau up-converteur et a permis d'étudier les propriétés d'up-conversion de ce matériau sous formes de particules sphériques monodisperses et sous forme de couches minces. Les ions erbium et ytterbium, étant connus pour leurs très bonnes propriétés en up-conversion, ont été choisis comme dopants. Deux méthodes de synthèses : la synthèse par précipitation homogène et la synthèse par voie hydrothermale, ont permis d'obtenir les particules respectant les contraintes morphologiques prédéfinies. L'étude de ce matériau sous forme de particules a permis de déterminer l'influence des différents paramètres physiques et chimiques sur les propriétés d'up-conversion. Les couches minces d'oxyde d'yttrium ont été obtenues par spin-coating. L'étude de ces couches minces a permis de démontrer que les rendements de luminescence mesurés sur les couches sont beaucoup plus faibles que ceux des particules; cependant, la nanostructuration des couches minces a permis de démontrer une exaltation des propriétés de luminescence grâce à l'interaction des ions émetteurs avec les structures plasmoniques résonantes. Des études réalisées en vue de l'application de l'up-conversion au photovoltaïque (génération de courant dans une cellule bifaciale c-Si par excitation sub-band-gap, mesure en fonction de la température, up-conversion sous excitation solaire) ont démontré la faisabilité du concept et a permis de conclure que la réalisation du concept up-conversion/photovoltaïque doit encore passer par l'optimisation des matériaux up-converteur.
APA, Harvard, Vancouver, ISO, and other styles
2

Andriamiadamanana, Mavintana Christian. "Addition de photons dans des couches nanostructurées pour des applications en photovoltaïque." Paris 6, 2012. https://tel.archives-ouvertes.fr/tel-00733872.

Full text
Abstract:
L'objectif de ce travail est d'étudier un matériau up-converteur sous différentes formes capable d'étendre l'utilisation du spectre solaire par les cellules photovoltaïques existantes. Y2O3: Er3+ (Yb3+) a été choisi comme matériau up-converteur et a permis d'étudier les propriétés d'up-conversion de ce matériau sous forme de particules sphériques monodisperses et sous forme de couches minces. Deux méthodes de synthèses : la synthèse par précipitation homogène et la synthèse par voie hydrothermale, ont permis d'obtenir les particules respectant les contraintes morphologiques prédéfinies. L'étude de ce matériau sous forme de particules a permis de déterminer l'influence des différents paramètres physiques et chimiques sur les propriétés d'up-conversion. Les couches minces d'oxyde d'yttrium ont été obtenues par spin-coating. La comparaison des propriétés de ces deux formes de matériaux a permis de démontrer que pour la même puissance d'excitation, les intensités de luminescence mesurées sur les couches sont beaucoup plus faibles que celles des particules; cependant, une étude réalisée sur la nanostructuration de couches minces d'YF3 a permis de démontrer une exaltation des propriétés de luminescence des couches minces, grâce à l'interaction des ions émetteurs avec les structures métalliques résonantes. Des études réalisées en vue de l'application de l'up-conversion au photovoltaïque (génération de courant dans une cellule bifaciale c-Si par excitation sub-bandgap, mesures en fonction de la température, up-conversion sous excitation solaire) ont démontré la faisabilité du concept.
APA, Harvard, Vancouver, ISO, and other styles
3

Taele, Benedict Molibeli. "III-V semiconducting hopping bolometers for detecting nonequilibrium phonons and astroparticles." Thesis, Lancaster University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322851.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Lovchik, Martin Alan. "TRANSITION METAL CATALYZED REARRANGEMENT OF DIMETHYL VINYLCYCLOBUTENE DICARBOXYLATES DERIVATIVES TO DIMETHYL CYCLOHEXADIENE DICARBOXYLATES AND PHTHALATES." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1000127850.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Schmidt, Johanna. "Lithography-based additive manufacturing of ceramics from siloxane preceramic polymers." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3425739.

Full text
Abstract:
Additive manufacturing is a fabrication approach which offers the possibility to build complex 3D structures from a virtual model without requiring moulds or costly post-processing steps to accom-plish the final structures. Digital Light Processing (DLP) and 2-Photon-Lithography (2PL), two lithog-raphy-based techniques, represent additive manufacturing processes, which offer the highest de-gree of achievable complexity and resolution in their printed structures. Both techniques print their 3D structures by using light to polymerise photosensitive materials. Photocurable preceramic poly-mer resins offer the possibility to be shaped by both DLP and 2PL printing and are subsequently transformed into ceramic material through pyrolysis, while maintaining their predetermined printed structure. This work is divided into four parts and presents complementary approaches at the material and production level to build highly complex 3D ceramic macro- and micro-structures, all based on the printing of a photosensitive siloxane preceramic polymer. In the first part the photosensitive polysiloxane is blended with other preceramic siloxane resins, of-fering no photosensitivity but a high ceramic yield upon pyrolysis. Complicated structures with cm-sized dimensions and resolution as low as 30 µm are shaped via DLP printing and turned into SiOC macro-structures with complete shape maintenance. The blending of two siloxanes offers the pos-sibility to control and alter the ceramic yield, shrinkage, resolution and free-carbon content of the structures, while at the same time exhibiting no diminished printing capability. Detailed sinter- and mechanical properties of one of the blends was investigated in detail and at all scales and demon-strated that, while the overall shape of ceramic structures are preserved during pyrolysis, different shrinkages as well as a change in aspect ratio depending on the structural configuration can occur and has to be taken into consideration. The photosensitive polysiloxane, already used for macro-fabrication to gain SiOC structures, was al-so used in 2PL printing to fabricate structures of the same complexity at the microscale. SiOC ce-ramics with homogenous shrinkage and feature sizes as low as 800 nm were built with the help of a new printing configuration and printed support structures. The third part of this work describes a complementary approach at the processing level, when SiOC ceramic structures are fabricated with a new hybrid additive manufacturing approach, combining DLP and 2PL printing. The advantages of DLP, the free standing and easy handling of macro-dimensional structures, are joined with the resolution capability of 2PL printing. Precisely positioned 3D structures with sub-µm sized features on top of cm-sized structured components were printed. In the final part the polymer processing capability of preceramic polymers and their transformation into a reactive ceramic phase upon pyrolysis is exploited. Instead of producing pure SiOC ceramics, the photocurable siloxane preceramic polymer is combined with alumina powders to develop a new ceramic phase, mullite, upon sintering. The phase transformation at low sintering temperatures de-veloped the new mullite phase within the 3D structure, fabricated due to the photosensitive capabil-ities of the siloxane via DLP printing. Due to the complementary approach in this work, 3D ceramic structures have been fabricated at the macroscale (DLP), microscale (2PL) and multi-scale (Hybrid additive manufacturing; DLP + 2PL) on basis of a photosensitive preceramic polymer. Different ceramic materials, SiOC and mullite, have been produced from the polysiloxane thanks to its transformation capability into SiOC ceramic and reactive SiO2 phase at high temperatures. Through the addition of passive and active fillers complex, dense, pore- and crack-free ceramic structures with no sign of delamination and complete mainte-nance of shape have been developed with varying properties.
APA, Harvard, Vancouver, ISO, and other styles
6

Foster, Daniel. "Mechanical and Thermal Characterization of Ultrasonic Additive Manufacturing." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1398997070.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

GRISCOM, LAURENT. "Synthese et proprietes optiques des verres de chalco-halogenures : spectroscopie a 1,3 microns et addition de photons des ions nd 3 + et pr 3 +." Rennes 1, 1999. http://www.theses.fr/1999REN10191.

Full text
Abstract:
Des sources lumineuses sont, a ce jour activement recherchees a 1,3 m pour augmenter la capacite des reseaux de telecommunications par fibres optiques. Pour cela, des compositions de verres dopes aux terres rares et optimises du point de leurs proprietes optiques sont necessaires. Les verres de chalcogenures ayant des indices de refraction eleves et une transparence dans l'infrarouge qui s'etend au-dela de 10 m possedent les qualites necessaires pour operer a cette longueur d'onde. Les verres de chalco-halogenures, avec les elements ge-ga-s-csx ou x = c1, br, i ont ete synthetise au laboratoire. L'ajout d'un halogenure au verre de chalcogenure se traduit par une amelioration de la stabilite thermique et un elargissement du domaine de la transparence dans le visible sans changer les caracteristiques dans l'infrarouge. Ces verres possedent, par ailleurs, une bonne solubilite des ions de terre rare. Ils ont ete dopes par les ions nd 3 + et pr 3 +. Les proprietes physiques et optiques (temperatures caracteristiques, densite, indices de refraction, transmission uv et ir) de ces verres ont ete mesurees et comparees avec celles de verres de sulfure classiques. La theorie de judd-ofelt a ete employee pour la comprehension des mecanismes des transitions 4f-4f dans ces verres. Cependant, les verres de chalcogenures posent des problemes pour l'application de cette theorie du fait du bandgap qui occulte les bandes d'absorption de haute energie des ions de terre rare. Quelques methodes nouvelles ont ete testees pour appliquer la theorie de judd-ofelt dans les verres de chalcogenures. Les emissions des ions nd 3 + et pr 3 + ont ete etudiees dans les verres ga-ge-csx, en fonction de halogene x et en fonction de la concentration en ions de terre rare. Concernant la neodyme, les spectres d'emission ir du niveau 4f 3 / 2 et les emissions visibles de ( 4g 7 / 2, 2k 1 3 / 2, 4g 9 / 2) ont ete enregistres et les durees de vie mesurees. Les processus d'esa a partir de 4f 3 / 2 qui contribuent a reduire l'emission a 1,3 m de nd 3 + ont ete egalement enregistre. Concernant le praseodyme, les spectres d'emissions ainsi que les durees de vie des niveaux 1g 4 (transition a 1,3 m), 1d 2 et 3p j ont ete mesures une part important de ce travail a ete consacre a la mise en evidence et a la caracterisation des processus d'addition de photons vers les niveaux ( 4g 7 / 2, 2k 1 3 / 2, 4g 9 / 2) de nd 3 + et vers les niveaux 1d 2 et 3p j de pr 3 +.
APA, Harvard, Vancouver, ISO, and other styles
8

Mummareddy, Bhargavi. "Additive Manufacturing Processes for High-Performance Ceramics: Manufacturing - Mechanical and Thermal property Relationship." Youngstown State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1629131959379597.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Cheung, Jessica Y. "Small-angle neutron scattering from oxygen precipitates in silicon annealed at low temperatures." Thesis, University of Reading, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369091.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Jahjah, Hussein Rabih. "Réactions radicalaires photo initiées de dérivés de la furanone et leur valorisation en synthèse organique." Reims, 2010. http://theses.univ-reims.fr/sciences/2010REIMS001.pdf.

Full text
Abstract:
La photochimie occupe une part de plus en plus importante en chimie organique, permettant d’obtenir dans des conditions douces un grand nombre de composés difficilement accessibles par les méthodes classiques. Au cours de ce travail, nous nous somme intéressé à différents aspects de la réactivité photochimique de dérivés de furanone. L’irradiation de furanones fonctionnalisées par le tétrahydropyrane et le glycose en présence de l’acétone comme sensibilisateur conduit par un mécanisme de transfert d’énergie à une réaction radicalaire intramoléculaire régiosélective où l’addition se fait en position α de la furanone. Une étape importante dans ce mécanisme est l’étape d’arrachement d’hydrogène. Une réaction d’épimérisation est mise en évidence au niveau du centre anomérique des composés β-anomères. Ce type de réaction photochimique permet d’accéder de façon contrôlé à des structures hautement fonctionnalisés (une famille de carbasucres). Nous avons réalisé une addition sélective en position α du composé carboxylé α,β-insaturé par un transfert mono-électronique via la formation d’un exciplexe ou d’une paire radicaux d’ions en contact. Le mécanisme de cette réaction est mis en évidence par un marquage au deutérium et la discussion de la régiosélectivité. Ce marquage nous a permis de découvrir l’origine de l’hydrogène additionné en position β de la furanone. Les structures accessibles par cette méthode peuvent avoir des propriétés anti-inflammatoires, analgésiques et antipyrétiques bactéricides et diurétique
Photochemistry plays an increasing role in organic chemistry, as a powerful approach to obtain under mild conditions a large number of compounds inaccessible by conventional methods. During this work, we looked at different aspects of the photochemical reactivity of furanone derivatives. Irradiation of furanones functionalized by tetrahydropyran and glucose in the presence of acetone as sensitizer led by a mechanism of energy transfer to a regioselective intramolecular radical reaction where the addition occurs in α position of the furanone. An important step in this mechanism is the hydrogen abstraction. A reaction of epimerization was shown at the anomeric center of β-anomers molecules. This type of photochemical reaction can be controlled to prepare highly functionalized structures (a family of Carba-Sugars). We have carried out a selective addition at a α-position of α,β-unsaturated carbonyl compound by a single-electron transfer via the formation of an exciplex or radical ion pair in contact. The mechanism of this reaction was revealed by a deuterium-labeling and interpretation of the regioselectivity. The isotopic-labeling allowed us to discover the origin of hydrogen added in β position of a furanone. Structures accessible by this method may have anti-inflammatory, analgesic, antipyretic and diuretic as well as bactericidal activities
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Photon addition"

1

Russia) Alexander Gurwitsch Conference (2nd 1999 Moscow. Biophotonics and coherent systems: Proceedings of the 2nd Alexander Gurwitsch Conference, and additional contributions. Moscow: Moscow University Press, 2000.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Meier, Hans-Jörg. Modellstudien zur flavinabhängigen Sauerstoffaktivierung: Nukleophile (Photo) additionen an Phenaziniumkationen. Konstanz: Hartung-Gorre, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Meiborg, Robert W. The romance is gone: Volume IV : annual year 2005 history of aerial photography including corrections, additions, photo spin-offs, personal biographies and any information gathered this year. [Wheaton, IL: Robert W. Meiborg, 2005.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Vučković, Jelena. Quantum optics and cavity QED with quantum dots in photonic crystals. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198768609.003.0008.

Full text
Abstract:
Quantum dots in optical nanocavities are interesting as a test-bed for fundamental studies of light–matter interaction (cavity quantum electrodynamics, QED), as well as an integrated platform for information processing. As a result of the strong field localization inside sub-cubic-wavelength volumes, these dots enable very large emitter–field interaction strengths. In addition to their use in the study of new regimes of cavity QED, they can also be employed to build devices for quantum information processing, such as ultrafast quantum gates, non-classical light sources, and spin–photon interfaces. Beside quantum information systems, many classical information processing devices, such as lasers and modulators, benefit greatly from the enhanced light–matter interaction in such structures. This chapter gives an introduction to quantum dots, photonic crystal resonators, cavity QED, and quantum optics on this platform, as well as possible device applications.
APA, Harvard, Vancouver, ISO, and other styles
5

Webber Phonological Awareness Photo Cards Addition of Phonemes, WPA-11 (Webber Phonological Awareness). Super Duper, 2005.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Hay, Wilbur. Additional Photos That Represent The Hell Of The Future: Volume 9. Wilbur Hay, 2022.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Horing, Norman J. Morgenstern. Interacting Electron–Hole–Phonon System. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198791942.003.0011.

Full text
Abstract:
Chapter 11 employs variational differential techniques and the Schwinger Action Principle to derive coupled-field Green’s function equations for a multi-component system, modeled as an interacting electron-hole-phonon system. The coupled Fermion Green’s function equations involve five interactions (electron-electron, hole-hole, electron-hole, electron-phonon, and hole-phonon). Starting with quantum Hamilton equations of motion for the various electron/hole creation/annihilation operators and their nonequilibrium average/expectation values, variational differentiation with respect to particle sources leads to a chain of coupled Green’s function equations involving differing species of Green’s functions. For example, the 1-electron Green’s function equation is coupled to the 2-electron Green’s function (as earlier), also to the 1-electron/1-hole Green’s function, and to the Green’s function for 1-electron propagation influenced by a nontrivial phonon field. Similar remarks apply to the 1-hole Green’s function equation, and all others. Higher order Green’s function equations are derived by further variational differentiation with respect to sources, yielding additional couplings. Chapter 11 also introduces the 1-phonon Green’s function, emphasizing the role of electron coupling in phonon propagation, leading to dynamic, nonlocal electron screening of the phonon spectrum and hybridization of the ion and electron plasmons, a Bohm-Staver phonon mode, and the Kohn anomaly. Furthermore, the single-electron Green’s function with only phonon coupling can be rewritten, as usual, coupled to the 2-electron Green’s function with an effective time-dependent electron-electron interaction potential mediated by the 1-phonon Green’s function, leading to the polaron as an electron propagating jointly with its induced lattice polarization. An alternative formulation of the coupled Green’s function equations for the electron-hole-phonon model is applied in the development of a generalized shielded potential approximation, analysing its inverse dielectric screening response function and associated hybridized collective modes. A brief discussion of the (theoretical) origin of the exciton-plasmon interaction follows.
APA, Harvard, Vancouver, ISO, and other styles
8

Boston Destinationmap City Map Travel Guide Points Of Interest Additional Inset Map Photos. National Geographic Maps, 2010.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

McNeill, William H., ed. Berkshire Encyclopedia of World History. Berkshire Publishing Group, 2016. http://dx.doi.org/10.1093/acref/9780190622718.001.0001.

Full text
Abstract:
580 entriesFrom the big bang to the 21st century, this renowned encyclopedia provides an integrated view of human and universal history. Eminent scholars examine environmental and social issues by exploring connections and interactions made over time (and across cultures and locales) through trade, warfare, migrations, religion, and diplomacy.Over 100 new articles, and 1,200 illustrations, photos, and maps from the collections of the Library of Congress, the World Digital Library, the New York Public Library, and many more sources, make this second edition a vital addition for world history-focused classrooms and libraries.
APA, Harvard, Vancouver, ISO, and other styles
10

Horing, Norman J. Morgenstern. Quantum Statistical Field Theory. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198791942.001.0001.

Full text
Abstract:
The methods of coupled quantum field theory, which had great initial success in relativistic elementary particle physics and have subsequently played a major role in the extensive development of non-relativistic quantum many-particle theory and condensed matter physics, are at the core of this book. As an introduction to the subject, this presentation is intended to facilitate delivery of the material in an easily digestible form to students at a relatively early stage of their scientific development, specifically advanced undergraduates (rather than second or third year graduate students), who are mathematically strong physics majors. The mechanism to accomplish this is the early introduction of variational calculus with particle sources and the Schwinger Action Principle, accompanied by Green’s functions, and, in addition, a brief derivation of quantum mechanical ensemble theory introducing statistical thermodynamics. Important achievements of the theory in condensed matter and quantum statistical physics are reviewed in detail to help develop research capability. These include the derivation of coupled field Green’s function equations of motion for a model electron-hole-phonon system, extensive discussions of retarded, thermodynamic and non-equilibrium Green’s functions, and their associated spectral representations and approximation procedures. Phenomenology emerging in these discussions includes quantum plasma dynamic, nonlocal screening, plasmons, polaritons, linear electromagnetic response, excitons, polarons, phonons, magnetic Landau quantization, van der Waals interactions, chemisorption, etc. Considerable attention is also given to low-dimensional and nanostructured systems, including quantum wells, wires, dots and superlattices, as well as materials having exceptional conduction properties such as superconductors, superfluids and graphene.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Photon addition"

1

Rasch, J. "On the Addition Theorem for Jacobi Polynomials." In Coincidence Studies of Electron and Photon Impact Ionization, 195–97. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4757-9751-0_23.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Vogel, Julia K., and Igor G. Irastorza. "Solar Production of Ultralight Bosons." In The Search for Ultralight Bosonic Dark Matter, 141–71. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95852-7_5.

Full text
Abstract:
AbstractThis chapter will spotlight axions produced in the core of the Sun. A first focus will be put on the production mechanism for axions in the solar interior through coupling of axions to photons via the Primakoff effect as well as their interactions with electrons. In addition to the axion production, the axion-to-photon conversion probability is a crucial quantity for solar axion searches (also referred to as helioscopes) and determines the expected number of photons from solar axion conversion that are detectable in a ground-based search. After these basic considerations, the helioscope concept will be detailed, and past, current, and future experimental realizations of axion helioscopes will be discussed. This includes the analysis used to aim at axion detection and upper limit calculations in case no signal above background is detected in experimental data. For completeness, alternative approaches other than traditional helioscopes to search for solar axions are discussed.
APA, Harvard, Vancouver, ISO, and other styles
3

Schwehr, Bradley J., David Hartnell, Massimiliano Massi, and Mark J. Hackett. "Luminescent metal complexes as emerging tools for lipid imaging." In Metal Ligand Chromophores for Bioassays, 75–114. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-19863-2_3.

Full text
Abstract:
AbstractFluorescence microscopy is a key tool in the biological sciences, which finds use as a routine laboratory technique (e.g., epifluorescence microscope) or more advanced confocal, two-photon, and super-resolution applications. Through continued developments in microscopy, and other analytical methods, the importance of lipids as constituents of subcellular organelles, signalling or regulating molecules continues to emerge. The increasing recognition of the importance of lipids to fundamental cell biology (in health and disease) has prompted the development of protocols and techniques to image the distribution of lipids in cells and tissues. A diverse suite of spectroscopic and microscopy tools are continuously being developed and explored to add to the “toolbox” to study lipid biology. A relatively recent breakthrough in this field has been the development and subsequent application of metal-based luminescent complexes for imaging lipids in biological systems. These metal-based compounds appear to offer advantages with respect to their tunability of the photophysical properties, in addition to capabilities centred around selectively targeting specific lipid structures or classes of lipids. The presence of the metal centre also opens the path to alternative imaging modalities that might not be applicable to traditional organic fluorophores. This review examines the current progress and developments in metal-based luminescent complexes to study lipids, in addition to exploring potential new avenues and challenges for the field to take.
APA, Harvard, Vancouver, ISO, and other styles
4

El-Tamer, Ayman, Ulf Hinze, and Boris N. Chichkov. "3D Mikro- und Nano-Strukturierung mittels Zwei-Photonen-Polymerisation." In Additive Manufacturing Quantifiziert, 117–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54113-5_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Mantelli, Andrea, Alessia Romani, Raffaella Suriano, Marinella Levi, and Stefano Turri. "Additive Manufacturing of Recycled Composites." In Systemic Circular Economy Solutions for Fiber Reinforced Composites, 141–66. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-22352-5_8.

Full text
Abstract:
AbstractAn additive remanufacturing process for mechanically recycled glass fibers and thermally recycled carbon fibers was developed. The main purpose was to demonstrate the feasibility of an additive remanufacturing process starting from recycled glass and carbon fibers to obtain a new photo- and thermally-curable composite. 3D printable and UV-curable inks were developed and characterized for new ad-hoc UV-assisted 3D printing apparatus. Rheological behavior was investigated and optimized considering the 3D printing process, the recyclate content, and the level of dispersion in the matrix. Some requirements for the new formulations were defined. Moreover, new printing apparatuses were designed and modified to improve the remanufacturing process. Different models and geometries were defined with different printable ink formulations to test material mechanical properties and overall process quality on the final pieces. To sum up, 3D printable inks with different percentages of recycled glass fiber and carbon fiber reinforced polymers were successfully 3D printed.
APA, Harvard, Vancouver, ISO, and other styles
6

Vanelstraete, A., and C. Laermans. "Additional Evidence for TLS in Electron-Irradiated Quartz from Ultrasonic Attenuation Measurements." In Phonon Scattering in Condensed Matter V, 73–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82912-3_22.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Döpp, Dietrich, and Hamid Reza Memarian. "Photo-Diels-Alder Addition of two Captodative Alkenes to 1-Acetonaphthone." In Substituent Effects in Radical Chemistry, 383–85. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4758-0_35.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Kousaalya, Adhimoolam Bakthavachalam. "Sustainable Photo-curable Polymers in Additive Manufacturing Arena: A Review." In Sustainability & Green Polymer Chemistry Volume 1: Green Products and Processes, 89–98. Washington, DC: American Chemical Society, 2020. http://dx.doi.org/10.1021/bk-2020-1372.ch005.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Dey, Argha, Subhasis Roy, and Sourav Mondal. "Performance Enhancement of Dye-Sensitized Solar Cell Using Extracted Photo-Sensitized Organic Molecules in Addition with Dielectric Nanomaterial." In Lecture Notes in Bioengineering, 415–22. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7409-2_41.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

O, Yong Taeg, and Dong Chan Shin. "Effects of Paraffin Addition on Optical Properties and Self-Assembly of SiO2 Photonic Crystal." In Solid State Phenomena, 611–14. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-31-0.611.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Photon addition"

1

Biagi, Nicola, Luca S. Costanzo, Marco Bellini, and Alessandro Zavatta. "Entanglement Generation by Delocalized Single-Photon Addition." In 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2019. http://dx.doi.org/10.1109/cleoe-eqec.2019.8873374.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Biagi, Nicola, Luca S. Costanzo, Marco Bellini, and Alessandro Zavatta. "Multiphoton Entanglement by Delocalized Single Photon Addition." In 2019 21st International Conference on Transparent Optical Networks (ICTON). IEEE, 2019. http://dx.doi.org/10.1109/icton.2019.8840485.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Biagi, Nicola, Luca S. Costanzo, Marco Bellini, and Alessandro Zavatta. "Macroscopic entangled states by delocalized single-photon addition." In Quantum Information and Measurement. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/qim.2019.t3a.2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Gard, Bryan T., Kaushik P. Seshadreesan, Jonathan P. Dowling, Benjamin E. Koltenbah, Claudio G. Parazzoli, Barbara A. Capron, Richard Birrittella, and Christopher C. Gerry. "Photon Addition and Subtraction: New Strategies in Metrology." In Frontiers in Optics. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/fio.2015.fw5a.3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Zavatta, A., M. Locatelli, C. Polycarpou, J. Fiurášek, and M. Bellini. "High-fidelity noiseless amplification by photon addition and subtraction." In SPIE Optics + Optoelectronics, edited by Ivan Prochazka and Jaromír Fiurásek. SPIE, 2011. http://dx.doi.org/10.1117/12.887192.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Parazzoli, Claudio G., Barbara A. Capron, Ben Koltenbah, David Gerwe, Paul Idell, Jonathan Dowling, Christopher Gerry, and Robert W. Boyd. "Enhanced Thermal Images of Faint Objects via Photon Addition / Subtraction." In CLEO: QELS_Fundamental Science. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/cleo_qels.2016.ftu3c.4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Biagi, Nicola, Saverio Francesconi, Manuel Gessner, Alessandro Zavatta, and Marco Bellini. "Using Coherent Multimode Photon Addition for Sensing a Remote Phase." In Quantum Information and Measurement. Washington, D.C.: OSA, 2021. http://dx.doi.org/10.1364/qim.2021.tu3a.6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Bellini, Marco, Nicola Biagi, Luca Salvatore Costanzo, and Alessandro Zavatta. "Quantum Light State Engineering and Entanglement Generation by Multimode Photon Addition." In 2018 IEEE Photonics Society Summer Topical Meeting Series (SUM). IEEE, 2018. http://dx.doi.org/10.1109/phosst.2018.8456771.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Elman, U., B. Luo, and S. Kroll. "The effect of laser frequency and phase fluctuations on coherent addition and erasure of photon echoes." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.ctuj3.

Full text
Abstract:
One important possible application of photon echoes is all-optical data storage. Photon echoes have a number of advantageous properties that make diem very good candidates for such applications, such as high areal density (1 Tb/cm2 has been projected [1], which should be compared with approximately 1 Mb/cm2 for commercially available CMOS memories today) and readout speeds >THz have been experimentally demonstrated [2]. We have addressed the problem of how to selectively erase data bits stored using photon echoes. One solution to this problem is to coherently add a new echo, phase shifted 180 degrees relative to the original echo, and thus achieve selective erasure of data [3].
APA, Harvard, Vancouver, ISO, and other styles
10

Lee, Su-Yong, Hyunchul Nha, Timothy Ralph, and Ping Koy Lam. "Quantum state engineering by a coherent superposition of photon subtraction and addition." In QUANTUM COMMUNICATION, MEASUREMENT AND COMPUTING (QCMC): The Tenth International Conference. AIP, 2011. http://dx.doi.org/10.1063/1.3630180.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Photon addition"

1

Sabri, Mahshad, Yasaman Hosseini, and Roya Sani. The Additive Prognostic Value of Coronary Artery Calcium Scoring and Single-Photon Emission Computed Tomography (SPECT) on Major Adverse Cardiac Events (MACE): A Systematic Review and Meta-analysis PROTOCOL. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, January 2023. http://dx.doi.org/10.37766/inplasy2023.1.0073.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Taverna, Kristin. Vegetation classification and mapping of land additions at Richmond National Battlefield Park, Virginia: Addendum to technical report NPS/NER/NRTR 2008/128. National Park Service, September 2022. http://dx.doi.org/10.36967/2294278.

Full text
Abstract:
In 2008 and 2015, the Virginia Department of Conservation and Recreation, Division of Natural Heritage produced vegetation maps for Richmond National Battlefield Park, following the protocols of the United States Geological Survey (USGS) – National Park Service (NPS) Vegetation Mapping Program. The original 2008 report was part of a regional project to map and classify the vegetation in seven national parks in Virginia. The 2015 report was an addendum to the original report and mapped the vegetation in newly acquired parcels. Since 2015, the park has acquired an additional 820 acres of land within 12 individual parcels, including the 650 acre North Anna unit. This report is an addendum to the 2008 and 2015 reports and documents the mapping of vegetation and other land-use classes for the 12 new land parcels at Richmond National Battlefield Park, with an updated vegetation map for the entire park. The updated map and associated data provide information on the sensitivity and ecological integrity of habitats and can help prioritize areas for protection. The vegetation map of the new land parcels includes eighteen map classes, representing 14 associations from the United States National Vegetation Classification, one nonstandard, park-specific class, and three Anderson Level II land-use categories. The vegetation classification and map classes are consistent with the original 2008 report. Vegetation-map classes for the new land parcels were identified through field reconnaissance, data collection, and aerial photo interpretation. Aerial photography from 2017 served as the base map for mapping the 12 new parcels, and field sampling was conducted in the summer of 2020. Three new map classes for the Park were encountered and described during the study, all within the North Anna park unit. These map classes are Coastal Plain / Outer Piedmont Basic Mesic Forest, Northern Coastal Plain / Piedmont Oak – Beech / Heath Forest, and Southern Piedmont / Inner Coastal Plain Floodplain Terrace Forest. The examples of Coastal Plain / Outer Piedmont Basic Mesic Forest and Southern Piedmont / Inner Coastal Plain Floodplain Terrace Forest at North Anna meet the criteria of size, condition, and landscape context to be considered a Natural Heritage exemplary natural community occurrence and should be targeted for protection and management as needed. New local and global descriptions for the three map classes are included as part of this report. Refinements were made to the vegetation field key to include the new map classes. The updated field key is part of this report. An updated table listing the number of polygons and total hectares for each of the 28 vegetation- map classes over the entire park is also included in the report. A GIS coverage containing a vegetation map for the entire park with updated Federal Geographic Data Committee (FGDC) compliant metadata was completed for this project. The attribute table field names are the same as the 2008 and 2015 products, with the exception of an additional field indicating the year each polygon was last edited.
APA, Harvard, Vancouver, ISO, and other styles
3

Gal'perin, Yu M., V. G. Karpov, and Володимир Миколайович Соловйов. Density of vibrational states in glasses. Springer, November 1988. http://dx.doi.org/10.31812/0564/1005.

Full text
Abstract:
A theory of the vibrational spectra of glasses, based on allowance for the statistical fluctuations of the local elastic constants, is proposed. The existence is established of two characteristic energies h, and h, , dividing the spectrum into regions of qualitatively different behavior of the density of states n (h). At low frequencices w 4 w, the increase of the density of states is determined by the additive contributions of phonons and mutually noninteracting quasilocal vibrations in random soft atomic potentials in the glass. In the intermediate region w , 5 w 5 w, the quasilocal vibrations interact strongly with phonons, and this makes their contributions superadditive. For w > w, the growth of n (h) slows down. As a result, n (h) increases at first more rapidly and then more slowly than the Debye density of states. An analytical expression for n (h) is obtained in the T-matrix formalism in the region w <a,, including the region of strong scattering. A numerical calculation of n (h) is performed in the coherent-potential approximation. The theory predicts qualitatively universal behavior of n (h) in different glasses.
APA, Harvard, Vancouver, ISO, and other styles
4

Shahak, Yosepha, and Donald R. Ort. Physiological Bases for Impaired Photosynthetic Performance of Chilling-Sensitive Fruit Trees. United States Department of Agriculture, May 2001. http://dx.doi.org/10.32747/2001.7575278.bard.

Full text
Abstract:
Chilling-sensitivity is an important agricultural problem in both the U.S. and Israel. Most research attention has focused so far on herbaceous crop plants, even though the problem is also acute in the fruit tree industry. Under BARD funding we made substantial progress in identifying the mechanisms involved in the disruption of photosynthesis following a chill in mango. Our investigation with fruit trees has been substantially accelerated by drawing on our knowledge and experience with herbaceous crops. The four original research objectives, focused or discovering the underlying mechanisms of chill-induced inhibition of photosynthesis in fruit trees, and the main achievements are listed below. [1] Separating stomatal from non-stomatal components of chilling on photosynthesis in fruit trees. We found evidence that the dark chill-induced inhibition of photosynthesis in mango was E combination of both stomatal and mesophyll components. [2] Differentiating photo damage from light-induced photo protection of photosystem II (PSII). Dark chilling exacerbate high light photoinhibition, as a result of primary inhibition in the carbor reduction cycle. Nevertheless, in Israeli orchards we observed chronic photoinhibition of PSII photochemistry in the winter. This photo damage was reversible over a few days if sunlight was attenuated with filters or night temperature rose. Practical implications of this finding deserve further investment. Additional achievement was the development of a new biophysical tool to study macro-structural changes of LHCII particles in intact, attached leaves. [3] Determine the role of oxidative stress in the dark-chilling-induced inhibition, with emphasis on oxygen radical scavenging, lipid peroxidation and redox-controlled carbon-cycle enzymes. We found an increase in lipid peroxidation following a dark chill, and partial protective effects or an antioxidant. However, the photoinhibition observed in mango orchards in Israel during the winter did not appear to be a general oxidative stress. [4] Investigate whether chilling interferes with the diurnal and circadian rhythm of gene expression of key photosynthetic proteins as has been shown for chilling-sensitive crop plants. The results indicated that most of the circadian rhythm in photosynthesis was due to reduced lea: internal CO2 concentrations during the subjective night, as a result of rhythmic stomatal closure Chilling-induced interference with circadian timing in mango, does not play the central role in chilling inhibition of photosynthesis that has previously been demonstrated in certain chilling sensitive herbaceous plants. Practical implications of the research achievements are feasible, but require few more years of research.
APA, Harvard, Vancouver, ISO, and other styles
5

Christopher, David A., and Avihai Danon. Plant Adaptation to Light Stress: Genetic Regulatory Mechanisms. United States Department of Agriculture, May 2004. http://dx.doi.org/10.32747/2004.7586534.bard.

Full text
Abstract:
Original Objectives: 1. Purify and biochemically characterize RB60 orthologs in higher plant chloroplasts; 2. Clone the gene(s) encoding plant RB60 orthologs and determine their structure and expression; 3. Manipulate the expression of RB60; 4. Assay the effects of altered RB60 expression on thylakoid biogenesis and photosynthetic function in plants exposed to different light conditions. In addition, we also examined the gene structure and expression of RB60 orthologs in the non-vascular plant, Physcomitrella patens and cloned the poly(A)-binding protein orthologue (43 kDa RB47-like protein). This protein is believed to a partner that interacts with RB60 to bind to the psbA5' UTR. Thus, to obtain a comprehensive view of RB60 function requires analysis of its biochemical partners such as RB43. Background & Achievements: High levels of sunlight reduce photosynthesis in plants by damaging the photo system II reaction center (PSII) subunits, such as D1 (encoded by the chloroplast tpsbAgene). When the rate of D1 synthesis is less than the rate of photo damage, photo inhibition occurs and plant growth is decreased. Plants use light-activated translation and enhanced psbAmRNA stability to maintain D1 synthesis and replace the photo damaged 01. Despite the importance to photosynthetic capacity, these mechanisms are poorly understood in plants. One intriguing model derived from the algal chloroplast system, Chlamydomonas, implicates the role of three proteins (RB60, RB47, RB38) that bind to the psbAmRNA 5' untranslated leader (5' UTR) in the light to activate translation or enhance mRNA stability. RB60 is the key enzyme, protein D1sulfide isomerase (Pill), that regulates the psbA-RN :Binding proteins (RB's) by way of light-mediated redox potentials generated by the photosystems. However, proteins with these functions have not been described from higher plants. We provided compelling evidence for the existence of RB60, RB47 and RB38 orthologs in the vascular plant, Arabidopsis. Using gel mobility shift, Rnase protection and UV-crosslinking assays, we have shown that a dithiol redox mechanism which resembles a Pill (RB60) activity regulates the interaction of 43- and 30-kDa proteins with a thermolabile stem-loop in the 5' UTR of the psbAmRNA from Arabidopsis. We discovered, in Arabidopsis, the PD1 gene family consists of II members that differ in polypeptide length from 361 to 566 amino acids, presence of signal peptides, KDEL motifs, and the number and positions of thioredoxin domains. PD1's catalyze the reversible formation an disomerization of disulfide bonds necessary for the proper folding, assembly, activity, and secretion of numerous enzymes and structural proteins. PD1's have also evolved novel cellular redox functions, as single enzymes and as subunits of protein complexes in organelles. We provide evidence that at least one Pill is localized to the chloroplast. We have used PDI-specific polyclonal and monoclonal antisera to characterize the PD1 (55 kDa) in the chloroplast that is unevenly distributed between the stroma and pellet (containing membranes, DNA, polysomes, starch), being three-fold more abundant in the pellet phase. PD1-55 levels increase with light intensity and it assembles into a high molecular weight complex of ~230 kDa as determined on native blue gels. In vitro translation of all 11 different Pill's followed by microsomal membrane processing reactions were used to differentiate among PD1's localized in the endoplasmic reticulum or other organelles. These results will provide.1e insights into redox regulatory mechanisms involved in adaptation of the photosynthetic apparatus to light stress. Elucidating the genetic mechanisms and factors regulating chloroplast photosynthetic genes is important for developing strategies to improve photosynthetic efficiency, crop productivity and adaptation to high light environments.
APA, Harvard, Vancouver, ISO, and other styles
6

Halevy, Orna, Zipora Yablonka-Reuveni, and Israel Rozenboim. Enhancement of meat production by monochromatic light stimuli during embryogenesis: effect on muscle development and post-hatch growth. United States Department of Agriculture, June 2004. http://dx.doi.org/10.32747/2004.7586471.bard.

Full text
Abstract:
The original objectives were: A. To determine the critical embryonic age for monochromatic green light stimulation. B. To follow the ontogeny of embryos exposed to monochromatic green light vs. darkness. C. To investigate the effects of monochromatic green light illumination on myoblast and fiber development in the embryo. D. To investigate the stimulatory effect of light combinations during embryo and post-hatch periods on growth and meat production. E. To evaluate the direct effect of monochromatic green light on cultured embryonic and adult myoblasts. The overall purpose of this study was to investigate the effect of monochromatic light stimuli during incubation period of broilers on muscle development and satellite cell myogenesis. Based on previous studies (Halevy et al., 1998; Rozenboim et al., 1999) that demonstrated the positive effects of green-light illumination on body and muscle growth, we hypothesized that monochromatic light illumination accelerates embryo and muscle development and subsequently enhances muscle growth and meat production. Thus, further decreases management costs. Under the cooperation of the laboratories at the Hebrew University of Jerusalem and University of Washington we have conducted the following: 1. We have established the critical stage for exposure to green monochromatic light which has the maximal effect on body and muscle growth (Objective A). We report that embryonic day 5 is optimal for starting illumination. The optimal regime of lighting that will eliminate possible heat effects was evaluated by monitoring egg core temperature at various illumination periods. We found that intermitted lighting (15 min. on; 15 min. off) is optimal to avoid heat effects. 2. We have evaluated in detail gross changes in embryo development profile associated to green light stimuli vs. darkness. In addition, we have investigated the stimulatory effect of light combinations during embryo and post-hatch periods on body and muscle growth (Objective B,D). 3. We have studied the expression profile of muscle regulatory proteins during chicken muscle cell differentiation in cultures using newly developed antibodies. This study paved the way for analyzing the expression of these proteins in our photo stimulation experiments (Objective C). 4. We have studied the pattern ofPax7 expression during myogenesis in the posthatch chicken. Experimental chick pectoralis muscles as well adult myoblast cultures were used in this study and the results led us to propose a novel model for satellite cell differentiation and renewal. 5. The effects of monochromatic green light illumination during embryogenesis have been studied. These studies focused on fetal myoblast and satellite cell proliferation and differentiation at pre- and posthatch periods and on the effects on the expression of muscle regulatory proteins which are involved in these processes. In addition, we have analyzed the effect of photo stimulation in the embryo on myofiber development at early posthatch (Objective C). 6. In follow the reviewers' comments we have not conducted Objective E. The information gathered from these studies is of utmost importance both, for understanding the molecular basis of muscle development in the posthatch chicks and for applied approach for future broiler management. Therefore, the information could be beneficial to agriculture in the short term on the one hand and to future studies on chick muscle development in the embryo and posthatch on the other hand.
APA, Harvard, Vancouver, ISO, and other styles
7

Asenath-Smith, Emily, Emma Ambrogi, Eftihia Barnes, and Jonathon Brame. CuO enhances the photocatalytic activity of Fe₂O₃ through synergistic reactive oxygen species interactions. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42131.

Full text
Abstract:
Iron oxide (α-Fe₂O₃, hematite) colloids were synthesized under hydrothermal conditions and investigated as catalysts for the photodegradation of an organic dye under broad-spectrum illumination. To enhance photocatalytic performance, Fe₂O₃ was combined with other transition-metal oxide (TMO) colloids (e.g., CuO and ZnO), which are sensitive to different regions of the solar spectrum (far visible and ultraviolet, respectively), using a ternary blending approach for compositional mixtures. For a variety of ZnO/Fe₂O₃/CuO mole ratios, the pseudo-first-order rate constant for methyl orange degradation was at least double the sum of the individual Fe₂O₃ and CuO rate constants, indicating there is an underlying synergy governing the photocatalysis reaction with these combinations of TMOs. A full compositional study was carried out to map the interactions between the three TMOs. Additional experiments probed the identity and role of reactive oxygen species and elucidated the mechanism by which CuO enhanced Fe₂O₃ photodegradation while ZnO did not. The increased photocatalytic performance of Fe2O3 in the presence of CuO was associated with hydroxyl radical ROS, consistent with heterogeneous photo-Fenton mechanisms, which are not accessible by ZnO. These results imply that low-cost photocatalytic materials can be engineered for high performance under solar illumination by selective pairing of TMOs with compatible ROS.
APA, Harvard, Vancouver, ISO, and other styles
8

Kharkivska, Alla A., Liudmyla V. Shtefan, Muntasir Alsadoon, and Aleksandr D. Uchitel. Technology of forming future journalists' social information competence in Iraq based on the use of a dynamic pedagogical site. [б. в.], July 2020. http://dx.doi.org/10.31812/123456789/3853.

Full text
Abstract:
The article reveals scientific approaches to substantiating and developing technology to form social information competence of future Iraqi journalists based on using a dynamic pedagogical site. After pre-interviewing students of the Journalism Faculty at Al-Imam Al-Kadhim University College for Islamic Sciences in Baghdad, the authors came to the conclusion there are issues on defining the essence of social information competences. It is established that the majority of respondents do not feel satisfied with the conditions for forming these competences in the education institutions. At the same time, there were also positive trends as most future journalists recognized the importance of these professional competences for their professional development and had a desire to attend additional courses, including distance learning ones. Subsequently, the authors focused on social information competence of future journalists, which is a key issue according to European requirements. The authors describe the essence of this competence as an integrative quality of personality, which characterizes an ability to select, transform information and allows to organize effective professional communication on the basis of the use of modern communicative technologies in the process of individual or team work. Based on the analysis of literary sources, its components are determined: motivational, cognitive, operational and personal. The researchers came to the conclusion that it is necessary to develop a technology for forming social information competence of future journalists based on the use of modern information technologies. The necessity of technology implementation through the preparatory, motivational, operational and diagnostic correction stages was substantiated and its model was developed. The authors found that the main means of technology implementation should be a dynamic pedagogical site, which, unlike static, allows to expand technical possibilities by using such applications as photo galleries, RSS modules, forums, etc. Technically, it can be created using Site builder. Further research will be aimed at improving the structure of the dynamic pedagogical site of the developed technology.
APA, Harvard, Vancouver, ISO, and other styles
9

Yatsymirska, Mariya. MODERN MEDIA TEXT: POLITICAL NARRATIVES, MEANINGS AND SENSES, EMOTIONAL MARKERS. Ivan Franko National University of Lviv, February 2022. http://dx.doi.org/10.30970/vjo.2022.51.11411.

Full text
Abstract:
The article examines modern media texts in the field of political journalism; the role of information narratives and emotional markers in media doctrine is clarified; verbal expression of rational meanings in the articles of famous Ukrainian analysts is shown. Popular theories of emotions in the process of cognition are considered, their relationship with the author’s personality, reader psychology and gonzo journalism is shown. Since the media text, in contrast to the text, is a product of social communication, the main narrative is information with the intention of influencing public opinion. Media text implies the presence of the author as a creator of meanings. In addition, media texts have universal features: word, sound, visuality (stills, photos, videos). They are traditionally divided into radio, TV, newspaper and Internet texts. The concepts of multimedia and hypertext are related to online texts. Web combinations, especially in political journalism, have intensified the interactive branching of nonlinear texts that cannot be published in traditional media. The Internet as a medium has created the conditions for the exchange of ideas in the most emotional way. Hence Gonzo’s interest in journalism, which expresses impressions of certain events in words and epithets, regardless of their stylistic affiliation. There are many such examples on social media in connection with the events surrounding the Wagnerians, the Poroshenko case, Russia’s new aggression against Ukraine, and others. Thus, the study of new features of media text in the context of modern political narratives and emotional markers is important in media research. The article focuses review of etymology, origin and features of using lexemes “cмисл (meaning)” and “сенс (sense)” in linguistic practice of Ukrainians results in the development of meanings and functional stylistic coloring in the usage of these units. Lexemes “cмисл (meaning)” and “сенс (sense)” are used as synonyms, but there are specific fields of meanings where they cannot be interchanged: lexeme “сенс (sense)” should be used when it comes to reasonable grounds for something, lexeme “cмисл (meaning)” should be used when it comes to notion, concept, understanding. Modern political texts are most prominent in genres such as interviews with politicians, political commentaries, analytical articles by media experts and journalists, political reviews, political portraits, political talk shows, and conversations about recent events, accompanied by effective emotional narratives. Etymologically, the concept of “narrative” is associated with the Latin adjective “gnarus” – expert. Speakers, philosophers, and literary critics considered narrative an “example of the human mind.” In modern media texts it is not only “story”, “explanation”, “message techniques”, “chronological reproduction of events”, but first of all the semantic load and what subjective meanings the author voices; it is a process of logical presentation of arguments (narration). The highly professional narrator uses narration as a “method of organizing discourse” around facts and impressions, impresses with his political erudition, extraordinary intelligence and creativity. Some of the above theses are reflected in the following illustrations from the Ukrainian media: “Culture outside politics” – a pro-Russian narrative…” (MP Gabibullayeva); “The next will be Russia – in the post-Soviet space is the Arab Spring…” (journalist Vitaly Portnikov); “In Russia, only the collapse of Ukraine will be perceived as success” (Pavel Klimkin); “Our army is fighting, hiding from the leadership” (Yuri Butusov).
APA, Harvard, Vancouver, ISO, and other styles
10

Tweet, Justin, Holley Flora, Summer Weeks, Eathan McIntyre, and Vincent Santucci. Grand Canyon-Parashant National Monument: Paleontological resource inventory (public version). National Park Service, December 2021. http://dx.doi.org/10.36967/nrr-2289972.

Full text
Abstract:
Grand Canyon-Parashant National Monument (PARA) in northwestern Arizona has significant paleontological resources, which are recognized in the establishing presidential proclamation. Because of the challenges of working in this remote area, there has been little documentation of these resources over the years. PARA also has an unusual management situation which complicates resource management. The majority of PARA is administered by the Bureau of Land Management (BLM; this land is described here as PARA-BLM), while about 20% of the monument is administered by the National Park Service (NPS; this land is described here as PARA-NPS) in conjunction with Lake Mead National Recreation Area (LAKE). Parcels of state and private land are scattered throughout the monument. Reports of fossils within what is now PARA go back to at least 1914. Geologic and paleontologic reports have been sporadic over the past century. Much of what was known of the paleontology before the 2020 field inventory was documented by geologists focused on nearby Grand Canyon National Park (GRCA) and LAKE, or by students working on graduate projects; in either case, paleontology was a secondary topic of interest. The historical record of fossil discoveries in PARA is dominated by Edwin McKee, who reported fossils from localities in PARA-NPS and PARA-BLM as part of larger regional projects published from the 1930s to the 1980s. The U.S. Geological Survey (USGS) has mapped the geology of PARA in a series of publications since the early 1980s. Unpublished reports by researchers from regional institutions have documented paleontological resources in Quaternary caves and rock shelters. From September to December 2020, a field inventory was conducted to better understand the scope and distribution of paleontological resources at PARA. Thirty-eight localities distributed across the monument and throughout its numerous geologic units were documented extensively, including more than 420 GPS points and 1,300 photos, and a small number of fossil specimens were collected and catalogued under 38 numbers. In addition, interviews were conducted with staff to document the status of paleontology at PARA, and potential directions for future management, research, protection, and interpretation. In geologic terms, PARA is located on the boundary of the Colorado Plateau and the Basin and Range provinces. Before the uplift of the Colorado Plateau near the end of the Cretaceous 66 million years ago, this area was much lower in elevation and subject to flooding by shallow continental seas. This led to prolonged episodes of marine deposition as well as complex stratigraphic intervals of alternating terrestrial and marine strata. Most of the rock formations that are exposed in the monument belong to the Paleozoic part of the Grand Canyon section, deposited between approximately 510 and 270 million years ago in mostly shallow marine settings. These rocks have abundant fossils of marine invertebrates such as sponges, corals, bryozoans, brachiopods, bivalves, gastropods, crinoids, and echinoids. The Cambrian–Devonian portion of the Grand Canyon Paleozoic section is represented in only a few areas of PARA. The bulk of the Paleozoic rocks at PARA are Mississippian to Permian in age, approximately 360 to 270 million years old, and belong to the Redwall Limestone through the Kaibab Formation. While the Grand Canyon section has only small remnants of younger Mesozoic rocks, several Mesozoic formations are exposed within PARA, mostly ranging in age from the Early Triassic to the Early Jurassic (approximately 252 to 175 million years ago), as well as some middle Cretaceous rocks deposited approximately 100 million years ago. Mesozoic fossils in PARA include marine fossils in the Moenkopi Formation and petrified wood and invertebrate trace fossils in the Chinle Formation and undivided Moenave and Kayenta Formations.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Photon addition' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography