1,722,958 research outputs found
Obituary: Anthony Starace (1945-2019)
Full text linkAnthony Starace, George Holmes University Professor of physics, died Sept. 5 from complications related to pancreatitis. He was 74.
Starace was born July 24, 1945, in the Queens borough of New York City. He graduated from Stuyvesant High School and earned his bachelor’s degree from Columbia University in 1966 before moving west to the University of Chicago, where he earned his doctorate under adviser Ugo Fano in 1971. It was in Chicago that he met Katherine Fritz of Beatrice, Nebraska, his wife of 51 years.
Following a postdoctoral appointment at Imperial College London, Starace moved to Lincoln as an assistant professor in 1973 and rapidly rose through the ranks, becoming a professor in 1981 and George Holmes University Professor in 2001.
Starace was one of the world’s leading experts in the physics of atomic photo-ionization. At the turn of the century, he became a pioneer in the field of attosecond science, in which extremely intense laser pulses of extremely short duration interact with nanoscale targets
Obituary: Anthony Starace (1945-2019)
Full text linkAnthony Starace, George Holmes University Professor of physics, died Sept. 5 from complications related to pancreatitis. He was 74.
Starace was born July 24, 1945, in the Queens borough of New York City. He graduated from Stuyvesant High School and earned his bachelor’s degree from Columbia University in 1966 before moving west to the University of Chicago, where he earned his doctorate under adviser Ugo Fano in 1971. It was in Chicago that he met Katherine Fritz of Beatrice, Nebraska, his wife of 51 years.
Following a postdoctoral appointment at Imperial College London, Starace moved to Lincoln as an assistant professor in 1973 and rapidly rose through the ranks, becoming a professor in 1981 and George Holmes University Professor in 2001.
Starace was one of the world’s leading experts in the physics of atomic photo-ionization. At the turn of the century, he became a pioneer in the field of attosecond science, in which extremely intense laser pulses of extremely short duration interact with nanoscale targets
Optimal management of nail disease in patients with psoriasis
No full textBianca Maria Piraccini, Michela Starace Division of Dermatology, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy Abstract: Psoriasis is a common skin disease, with nail involvement in approximately 80% of patients. Nail psoriasis is often associated with psoriatic arthropathy. Involvement of the nails does not always have relationship with the type, gravity, extension, or duration of skin psoriasis. Nail psoriasis can occur at any age and all parts of the nails and the surrounding structures can be affected. Two clinical patterns of nail manifestations have been seen due to psoriasis: nail matrix involvement or nail bed involvement. In the first case, irregular and deep pitting, red spots of the lunula, crumbling, and leukonychia are seen; in the second case, salmon patches, onycholysis with erythematous border, subungual hyperkeratosis, and splinter hemorrhages are observed. These clinical features are more visible in fingernails than in toenails, where nail abnormalities are not diagnostic and are usually clinically indistinguishable from other conditions, especially onychomycosis. Nail psoriasis causes, above all, psychosocial and aesthetic problems, but many patients often complain about functional damage. Diagnosis of nail psoriasis is clinical and histopathology is necessary only in selected cases. Nail psoriasis has an unpredictable course but, in most cases, the disease is chronic and complete remissions are uncommon. Sun exposure does not usually improve and may even worsen nail psoriasis. There are no curative treatments. Treatment of nail psoriasis includes different types of medications, from topical therapy to systemic therapy, according to the severity and extension of the disease. Moreover, we should not underestimate the use of biological agents and new therapy with lasers or iontophoresis. This review offers an investigation of the different treatment options for nail psoriasis and the optimal management of nail disease in patients with psoriasis. Keywords: biologics, nail psoriasis, topical therapy, systemic therap
Certezza e ordine del "ius civile" nell' "Enchiridion"
No full textI concetti di ordine, organizzazione, certezza del diritto che si è soliti impiegare per descrivere il fenomeno della codificazione in età tardo antica, possono rivelarsi di aiuto anche per una indagine dello sviluppo storico del ius civile nell'Enchiridion di Pomponio. In questa chiave di lettura emerge una precisa finalità del giurista antonino, quella di accentuare l'importanza e la centralità del ruolo svolto dalla giurisprudenza nella produzione e applicazione del diritto, in un momento nel quale si manifestava con crescente prepotenza l'impiego di quegli stessi concetti da parte del potere imperiale in funzione della attuazione di una politica di progressivo accentramento.The concepts of order, organization, certainty of law, usually characterizing the phenomen of codification completely implemented in Late antiquity, revel theyself advantageous for retracing the historical development of ius civile in Pomponii Enchiridion. This interpretation shows the finality of the author to emphasize jurisprudence’s role in contrast of the bully imperial trend to use the same concepts for political reasons, that is put into effect centralization and command of law’s production and application
Two-photon detachment cross sections and dynamic polarizability of H\u3csup\u3e-\u3c/sup\u3e using a variationally stable, coupled-channel hyperspherical approach
Full text linkWe present a generalization of the variationally stable method of Gao and Starace [B. Gao and A. F. Starace, Phys. Rev. Lett. 61, 404 (1988); Phys. Rev. A 39, 4550 (1989)] for two-electron atoms and ions that incorporates a coupled-channel adiabatic hyperspherical approach. Using this approach, we report results for two-photon detachment of H-, in which we have coupled one, two, three, and four adiabatic hyperspherical channels within each term level of the initial, intermediate, and final states. We present results also for the dynamic polarizability of H- as well as for the one-photon detachment cross section. Comparisons are given with results of prior work
Applications of Elliptically-Polarized, Few-Cycle Attosecond Pulses
No full textUse of elliptically-polarized light opens the possibility of investigating effects that are not accessible with linearly-polarized pulses. This talk presents new physical effects that are predicted for ionization of the helium atom by few-cycle, elliptically-polarized attosecond pulses. For double ionization of He by an intense elliptically-polarized attosecond pulse, we predict a nonlinear dichroic effect (i.e., the difference of the two-electron angular distributions in the polarization plane for opposite helicities of the ionizing pulse) that is sensitive to the carrier-envelope phase, ellipticity, peak intensity I, and temporal duration of the pulse [1]. For single [2,3] and double ionization [4] of He by two oppositely circularly-polarized, time-delayed attosecond pulses, we predict that the photoelectron momentum distributions in the polarization plane have helical vortex structures that are exquisitely sensitive to the time-delay between the pulses, their relative phase, and their handedness [2-4]. These effects manifest the ability to control the angular distributions of the ionized electrons by means of the attosecond pulse parameters. Our predictions are obtained numerically by solving the two-electron time-dependent Schrödinger equation for the six-dimensional case of elliptically-polarized attosecond pulses. They are interpreted analytically by means of perturbation theory analyses of the two ionization processes.
*This work is supported in part by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Award No. DE-FG03-96ER14646.
[1] J.M. Ngoko Djiokap, N.L. Manakov, A.V. Meremianin, S.X. Hu, L.B. Madsen, and A.F. Starace, “Nonlinear dichroism in back-to-back double ionization of He by an intense elliptically-polarized few-cycle XUV pulse,” Phys. Rev. Lett. 113, 223002 (2014).
[2] J.M. Ngoko Djiokap, S.X. Hu, L.B. Madsen, N.L. Manakov, A.V. Meremianin, and A.F. Starace, “Electron Vortices in Photoionization by Circularly Polarized Attosecond Pulses,” Phys. Rev. Lett. 115, 113004 (2015).
[3] J.M. Ngoko Djiokap, A.V. Meremianin, N.L. Manakov, S.X. Hu, L.B. Madsen, and A.F. Starace, “Multistart Spiral Electron Vortices in Ionization by Circularly Polarized UV Pulses,” Phys. Rev. A 94, 013408 (2016).
[4] J.M. Ngoko Djiokap, A.V. Meremianin, N.L. Manakov, S.X. Hu, L.B. Madsen, and A.F. Starace, “Kinematical Vortices in Double Photoionization of Helium by Attosecond Pulses,” Phys. Rev. A (accepted 19 June 2017, in press).Non UBCUnreviewedAuthor affiliation: University of NebraskaFacult
Fili della trasmissione. Il progetto delle donne De Viti De Marco-Starace nel Salento del Novecento.
No full textStudio sulla trasmissione di un progetto politico tra due generazioni di donne della famiglia De Viti De Marco-Starace nel Salento della prima metà del '90
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