170,542 research outputs found
Hubert Michel et J.-C. Santucci (dir.). Le Maghreb et le monde arabe
No full textAdda Joëlle. Hubert Michel et J.-C. Santucci (dir.). Le Maghreb et le monde arabe. In: Politique étrangère, n°1 - 1989 - 54ᵉannée. pp. 152-153
I borghi, presepi d'Italia. Ma anche: sfida culturale, tutela del paesaggio e modello alternativo di sviluppo
No full textNocheta adda Rolston 1980
No full textNocheta adda Rolston, 1980 Examined material (n=16): Pará. 4 ♂, Parauapebas, Serraria, Serra Norte, 8 ♂ 3 ♀, Pojuca. Acre. 1 ♀, Rio Branco. Distribution. Rolston et al. (1980) described Nocheta adda based in a male from Brazilian Amazon, but did not mentioned the state. A—Pará and Acre. C—Suriname (Rolston et al. 1980; Grazia 1989).Published as part of Silva, Valeria Juliete Da, Santos, Cleverson Rannieri Meira Dos & Fernandes, Jose Antonio Marin, 2018, Stink bugs (Hemiptera: Pentatomidae) from Brazilian Amazon: checklist and new records, pp. 401-455 in Zootaxa 4425 (3) on page 443, DOI: 10.11646/zootaxa.4425.3.1, http://zenodo.org/record/126751
[Uebergang schweizerischer Krieger über die Adda]
No full textDargestellt wird eine Schlacht 1521 am Fluss Adda während den Italienischen KriegenBullinger del. ; D. Ehrenzeller sc. 1826Blatt im Umschlag mit der Bezeichnung "Keine Brun Nr. Schweizerische Erzählungen. St. Gallen. (30 von 32 Kupfern)" und handschriftlicher Notiz "vollst. Exemplar ZB 36 513 / 6 Radierungen von David Ehrenzeller 1826"Oberhalb des Bildfeldes rechts bezeichnet "P. 147."Handschriftliche Notiz auf dem Blatt "28"Handschriftliche Notiz auf dem Unterlagenblatt "D. Ehrenzeller sc. 1826 nach Bullinger"Weiteres Exemplar (Bild 6 x 7,1 cm, Platte 7,1 cm, Blatt 7,8 x 9,4 cm) unter der Signatur: Geschichte 1521 Adda I, 1Erschienen in: [Leonhard Meister]: Schweizerische Erzählungen, St. Gallen [1826?], nach S. 14
Economia dello Sport
No full textStudio delle caratteristiche economiche e istituzionali dei mercati delle attività sportive. I beni scambiati sono molteplici: dall'organizzazione di competizioni alla prestazione degli atleti professionisti, agli strumenti per svolgere l'attività sportiva. La domanda e l'offerta sono diversificate a seconda della tipologia di prodotto venduto. Il valore della produzione di beni e servizi sportivi contribuisce a formare il prodotto interno lordo, che rappresenta un indice sintetico della ricchezza di un paese. Lo sport è un settore in continua crescita ed espansione. E' considerato dall'Unione Europea uno degli obiettivi strategici da perseguire per realizzare prosperità e solidarietà
Capabilities of the ADDA code for nanophotonics
No full textInternational audienceThe open-source code ADDA (https://github.com/adda-team/adda) is based on the discrete dipole approximation (DDA) – a numerically exact method derived from the frequency-domain volume-integral formulation of the Maxwell equations [1]. It can simulate interaction of electromagnetic fields (scattering and absorption) with finite 3D objects of arbitrary shape and composition. Besides standard sequential execution on a CPU or a GPU, ADDA can run on a multiprocessor distributed-memory system, parallelizing a single DDA calculation. This together with almost linear scaling of computational complexity with the number of dipoles (discretization voxels) allows huge system sizes and/or fine discretization levels. The code is written in C99, is highly portable, and includes a graphical user interface.ADDA provides full control over the scattering geometry (particle morphology and orientation, incident beam) and allows one to calculate a wide variety of integral and angle-resolved quantities. In addition to far-field scattering by various beams (including built-in Gaussian and Bessel ones), this includes near fields as well as excitation by a point dipole or a fast electron. Moreover, ADDA can rigorously and efficiently simulate the scattering by particles near a plane homogeneous substrate or placed in a homogeneous absorbing host medium. It also incorporates many DDA improvements aimed at increasing both the accuracy and computational speed.At the conference we will describe the main features of ADDA, including the ones still in development, with special emphasis on nanoparticles. They include a wide range of built-in Bessel beams [2] and simulations of electron energy-loss spectroscopy (EELS) and cathodoluminescence [3]. The latter two can be computed in an arbitrary passive host medium, even when the electron emits the Cherenkov radiation, or for particles on top of a semi-infinite substrate (under certain approximations). These capabilities also generalize the concept of the Purcell effect, which ADDA can rigorously compute in free space or near a substrate. Placing a point source inside a nanoparticle allows one to calculate near-field radiative heat transfer or Casimir forces between two objects. Recent numerical improvements include block- or shifted iterative methods to accelerate computations for multiple incident beams (e.g., particle orientations) or refractive indices.References:[1] M.A. Yurkin and A.G. Hoekstra, “The discrete-dipole-approximation code ADDA: Capabilities and known limitations,” J. Quant. Spectrosc. Radiat. Transfer 112, 2234–2247 (2011).[2] S.A. Glukhova and M.A. Yurkin, “Vector Bessel beams: General classification and scattering simulations,” Phys. Rev. A 106, 033508 (2022).[3] A.A. Kichigin and M.A. Yurkin, “Simulating electron energy-loss spectroscopy and cathodoluminescence for particles in arbitrary host medium using the discrete dipole approximation,” J. Phys. Chem. C 127, 4154–4167 (2023)
Gebel Adda Cemeteries 3 and 4 (1963-1964)
No full textThe excavation team of the American Research Center in
Egypt, under the direction of Dr Nicholas B. Millet, first
arrived at Gebel Adda in January 1963, for what were to
be four excavation seasons. Excavations started in Cemetery
1, which included numerous tumuli, extending over
c. 450m from the southern end of the concession to north
east of the Citadel (Millet 1963). Work began in the south
of the cemetery and excavated c. 127 tumuli, dated to the
later post-Meroitic (X-Group) period. In the same area,
amongst the tumuli, c. 30 medieval (Christian) graves were
also found, thought likely to date to the earliest period
of Christianization at Gebel Adda. Four examples of the
double domed mud-brick tombs of the post-medieval
(Islamic) period were also excavated in Cemetery One.
In March 1963 excavations were also begun in Cemetery
3, lying some 160m south east of the Citadel hill (Figure
1, Plate 1), an area covered with much wind-blown sand,
exposing c. 400 tombs during the first season (Millet 1963,
154). This work was continued in the second (1963-1964)
season (Millet 1964) and the third season, for which no
preliminary report was published (see also Millet 1967b;
1968; 2005; Grzymski 2010).
Some preliminary observations of this area were published
as the excavations were still underway by Millet (Millet 1963;
1964), but little else relating to this important work has yet
been published. However, the first author (RH), as a member
of the ARCE team, can throw some further light on some features of the excavations. Most importantly, having carried
out much of the original preparation of site plans, it has been
possible to reconstruct here some partial plans of Cemetery
3, which together with personal photographs of the site
provide some useful new information concerning this part of
the Gebel Adda excavations. Until the surviving site archives
are more fully studied, and hopefully published, this brief
report, as with previous reports (Huber and Edwards 2009;
2010), can provide a few further insights into the fascinating
and clearly complex history of the Gebel Adda cemeteries
The C terminus of the AddA subunit of the Bacillus subtilis ATP-dependent DNase is required for the ATP-dependent exonuclease activity but not for the helicase activity
No full textComparison of subunit AddA of the Bacillus subtilis AddAB enzyme, subunit RecB of the Escherichia coli RecBCD enzyme, and subunit RecB of the Haemophilus influenzae RecBCD enzyme revealed several regions of homology. Whereas the first seven regions are common among helicases, the two C-terminally located regions are unique for RecB of E. coli and H. influenzae and AddA. Deletion of the C-terminal region resulted in the production of an enzyme which showed moderately impaired levels of ATP-dependent helicase activity, whereas the ATP-dependent exonuclease activity was completely destroyed. The mutant enzyme was almost completely capable of complementing E. coli recBCD and B. subtilis addAB strains with respect to DNA repair and homologous recombination. These results strongly suggest that at least part of the C-terminal region of the AddA protein is indispensable for exonuclease activity and that, in contrast to the exonuclease activity, the helicase activity of the addAB gene product is important for DNA repair and homologous recombination.</p
Recent developments of the ADDA code
No full textInternational audienceThe open-source code ADDA (https://github.com/adda-team/adda) is based on the discrete dipoleapproximation (DDA) – a numerically exact method derived from the frequency-domain volume-integralformulation of Maxwell’s equations [1]. It can simulate the interaction of electromagnetic fields(scattering and absorption) with finite 3D objects of arbitrary shape and composition. Besides standardsequential execution on a single CPU or GPU, ADDA can run on a multiprocessor distributed-memorysystem, parallelizing a single DDA calculation. This, combined with the almost linear scaling ofcomputational complexity with the number of dipoles (discretization voxels), allows large system sizesand/or fine discretization levels.ADDA is written in C99 and is highly portable. It provides full control over the scattering geometry(particle morphology and orientation, incident beam) and allows users to calculate a wide variety ofintegral and angle-resolved quantities. In addition to far-field scattering by various beams (includingbuilt-in Gaussian and Bessel beams), this includes near fields as well as excitation by a point dipole or afast electron. Moreover, ADDA can rigorously and efficiently simulate the scattering by particles near aplane homogeneous substrate or embedded in a homogeneous absorbing host medium. It alsoincorporates many DDA improvements aimed at increasing both accuracy and computational speed.In this talk we will focus on the recently implemented ADDA features, either incorporated into themain codebase or available in separate development branches. These include a wide range of built-inBessel beams [2] and simulations of electron energy-loss spectroscopy (EELS) and cathodoluminescence[3]. The latter two can be computed in an arbitrary passive host medium, even when the electron emitsthe Cherenkov radiation, or for particles on top of a semi-infinite substrate (under certainapproximations). These capabilities also generalize the concept of the Purcell factor (i.e., theenhancement of a point-dipole emitter), which ADDA can rigorously compute in free space or near asubstrate [4].Next, we will discuss the analytical approximations of Green’s-tensor integrals for the correspondingDDA formulation, known as IGT, as well as various enhancements to the iterative solvers. Theseenhancements include block- or shifted iterative methods to accelerate computations for multipleincident beams (e.g., particle orientations) or refractive indices, as well as the use of specialized initialguesses for large particles [5]. Finally, many of these features are accessible through a graphical userinterface and we are actively working on integrating ADDA with Spack – a package manager thatfacilitates installation on a wide range of systems, including supercomputing environments.[1] M. A. Yurkin and A. G. Hoekstra, J. Quant. Spectrosc. Radiat. Transfer 112, 2234 (2011).[2] S. A. Glukhova and M. A. Yurkin, Phys. Rev. A 106, 033508 (2022).[3] A. A. Kichigin and M. A. Yurkin, J. Phys. Chem. C 127, 4154 (2023).[4] A. E. Moskalensky and M. A. Yurkin, Phys. Rev. A 99, 053824 (2019).[5] K. G. Inzhevatkin and M. A. Yurkin, J. Quant. Spectrosc. Radiat. Transfer 277, 107965 (2022)
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