Multipole (E1, M1, E2, M2, E3, M3) transition wavelengths and rates between 3l5l' excited and ground states in nickel-like ions

A relativistic many-body method is developed to calculate energy and transition rates for multipole transitions in many-electron ions. This method is based on relativistic many-body perturbation theory (RMBPT), agrees with MCDF calculations in lowest-order, includes all second-order correlation corrections and includes corrections from negative energy states. Reduced matrix elements, oscillator strengths, and transition rates are calculated for electric-multipole (dipole (E1), quadrupole (E2), and octupole (E3)) and magnetic-multipole (dipole (M1), quadrupole (M2), and octupole (M3)) transitions between 3l5l' excited and ground states in Ni-like ions with nuclear charges ranging from Z = 30 to 100. The calculations start from a 1s22s22p63s23p63d10} Dirac-Fock potential. First-order perturbation theory is used to obtain intermediate-coupling coefficients, and second-order RMBPT is used to determine the matrix elements. A detailed discussion of the various contributions to the dipole matrix elements and energy levels is given for nickellike tungsten (Z = 74). The contributions from negative-energy states are included in the second-order E1, M1, E2 M2, E3, and M3 matrix elements. The resulting transition energies and transition rates are compared with experimental values and with results from other recent calculations. These atomic data are important in modeling of M-shell radiation spectra of heavy ions generated in electron beam ion trap experiments and in M-shell diagnostics of plasmas.Comment: 21 pages, 8 figures, 11 table

Ab initio oscillator strengths for transitions between J=1 odd and J=1,2 even excited states of Ne I

Ab initio theory is developed for radiative transitions between excited states of neon. Calculations of energies for even excited states J=1, J=2 supplement our previous calculations for J=1 odd excited states. Line strengths for transitions between J=1 odd and J=1,2 even states of Ne I are evaluated. A comparison with experiments and semiempirical calculations is given.Comment: 5 page

Mixed configuration-interaction and many-body perturbation theory calculations of energies and oscillator strengths of J=1 odd states of neon

Ab-initio theory is developed for energies of J=1 particle-hole states of neutral neon and for oscillator strengths of transitions from such states to the J=0 ground state. Hole energies of low-Z neonlike ions are evaluated.Comment: 5 pages, 1 figure, 4 table

The ability of a barotropic model to simulate sea level extremes of meteorological origin in the Mediterranean Sea, including those caused by explosive cyclones

Storm surges are responsible for great damage to coastal property and loss of life every year. Coastal management and adaptation practices are essential to reduce such damage. Numerical models provide a useful tool for informing these practices as they simulate sea level with high spatial resolution. Here we investigate the ability of a barotropic version of the HAMSOM model to simulate sea level extremes of meteorological origin in the Mediterranean Sea, including those caused by explosive cyclones. For this purpose, the output of the model is compared to hourly sea level observations from six tide gauge records (Valencia, Barcelona, Marseille, Civitavecchia, Trieste, and Antalya). It is found that the model underestimates the positive extremes significantly at all stations, in some cases by up to 65%. At Trieste, the model can also sometimes overestimate the extremes significantly. The differences between the model and the residuals are not constant for extremes of a given height, which limits the applicability of the numerical model for storm surge forecasting because calibration is difficult. The 50 and 10 year return levels are reasonably well captured by the model at all stations except Barcelona and Marseille, where they are underestimated by over 30%. The number of exceedances of the 99.9th and 99.95% percentiles over a period of 25 years is severely underestimated by the model at all stations. The skill of the model for predicting the timing and value of the storm surges seems to be higher for the events associated with explosive cyclones at all stations

Laser gas-discharge absorption measurements of the ratio of two transition rates in argon

The ratio of two line strengths at 922.7 nm and 978.7 nm of argon is measured in an argon pulsed discharge with the use of a single-mode Ti:Sapphire laser. The result 3.29(0.13) is in agreement with our theoretical prediction 3.23 and with a less accurate ratio 2.89(0.43) from the NIST database.Comment: 5 pages, 2 figures, 1 tabl

Theoretical overview of atomic parity violation. Recent developments and challenges

Recent advances in interpreting the most accurate to-date measurement of atomic parity violation in Cs are reviewed. The inferred nuclear weak charge, Q_W = - 72.65(28)_expt (36)_theor, agrees with the prediction of the standard model at 1 sigma level. Further improved interpretation is limited by an accuracy of solving basic correlation problem of atomic structure. We report on our progress in solving this problem within the relativistic coupled-cluster formalism. We include single-, double- and triple- electronic excitations in the coupled-cluster expansion. Numerical results for energies, electric-dipole matrix elements, and hyperfine-structure constants of Cs are presented.Comment: PAVI'06 proceedings + EJPA; refs + SM Qw fixe

Transcribing Emotions in Spatial Journals: A Study of Good Morning, Midnight and Voyage in the Dark by Jean Rhys

Στόχος αυτής της διατριβής είναι να μελετήσει τις αναπαραστάσεις και μεταπλάσεις του χώρου που γίνονται με βάση τα συναισθήματα, σε δυο έργα της Jean Rhys. Διερευνώ το χώρο ως εύπλαστο και με την ικανότητα να μεταμορφωθεί, ακολουθώντας την προσέγγιση του Andrew Thacker στο Modernism, Space, and the City για τα γεωγραφικά συναισθήματα (“geographical emotions”), την αλληλεπίδραση του χώρου και του συναισθήματος στο Poetics of Space του Gaston Bachelard, και τους τρόπους με τους οποίους η Deborah L. Parsons ερμηνεύει την πόλη ως κείμενο. Προκειμένου να δώσω έμφαση στην αλληλεπίδραση χώρου και συναισθημάτων, υποστηρίζω πως ο χώρος λειτουργεί σαν ημερολόγιο πάνω στο οποίο οι κάτοικοι καταγράφουν τα συναισθήματά τους. Η διατριβή αυτή θα επικεντρωθεί κυρίως σε δύο έργα, το Good Morning Midnight (1939) και το Voyage in the Dark (1934) της Jean Rhys τα οποία αφορούν τη ζωή δυο περιθωριοποιημένων γυναικών σε δύο μητροπόλεις, και συγκεκριμένα το Παρίσι και το Λονδίνο. Η Sasha Jansen και η Anna Morgan καταγράφουν τα συναισθήματά τους στο περιβάλλον γύρω τους, ενώνοντας τον εσωτερικό τους κόσμο με τον εξωτερικό χώρο. Έτσι, οι πρωταγωνίστριες δίνουν την εντύπωση ότι μετατρέπουν το χώρο σε προσωπικά ημερολόγια. Με αυτόν τον τρόπο, οι απρόσωποι εξωτερικοί χώροι και οι εσωτερικοί κόσμοι των δύο γυναικών ενώνονται. Χρησιμοποιώντας την ιδέα του ημερολογίων μαζί με τις αναπαραστάσεις χώρου στα δύο βιβλία της Rhys, ο στόχος μου είναι να ερευνήσω τους τρόπους με τους οποίους τα συναισθήματα και η κοινωνική περιθωριοποίηση των πρωταγωνιστριών μεταβάλλουν τους χώρους που ζουν.My thesis explores representations of space and its transformations based on feelings in two works by Jean Rhys. Drawing on Gaston Bachelard’s Poetics of Space, Andrew Thacker’s approach to geographical emotions in Modernism, Space, and the City, and Deborah L. Parsons’s interpretation of the city as text, I examine space as malleable and able to be transformed according to the emotions of its inhabitants. I argue that space functions like a journal upon which the feelings of the dwellers are transcribed. For my textual analysis I focus on Good Morning, Midnight (1939) and Voyage in the Dark (1934) by Jean Rhys. Both novels delve into the life of marginal women in European capitals: Paris and London. Sasha Jansen and Anna Morgan project their emotions onto their surroundings, dissolving the boundaries between their internal world and external space. Thus, the otherwise impersonal public spaces are transformed into personal mental journals of the protagonists’ subjectivities. As a result, both novels configure space as transformative, based on the emotional response of its marginal female inhabitant. By intertwining the idea of journals with Rhys’s spatial representations, I aim to examine the ways in which her protagonists’ emotions shape the spaces they inhabit based on their helpless and alienated conditions in the metropolis

Analysis of the Extreme Weather Event “Athina” in Early October 2021

Extreme weather events are identified as a major area of interest, and further consideration is demanded. This study investigates the synoptic and dynamic aspects of a storm system, named “Athina”, that affected most of Greece in early October 2021. This system is synoptically attributed to a low surface pressure generated in the Gulf of Genoa, linked to a mid-tropospheric, almost neutral tilted trough, over central Europe. “Athina” brought heavy rain and strong winds to many parts of Greece, causing flooding and landslides in several areas and caused travel disruptions, with ferries and flights cancelled due to the adverse weather conditions. The worst-hit regions were the northwestern part of the country and Evia. Synoptic maps for upper and lower troposphere, observations from Hellenic National Meteorological Service’s network, and satellite imagery were usedfor the analysis of this weather event. The results from a regional numerical weather prediction model are also presented