1,023 research outputs found
Far-infrared vibrational properties of tetragonal C60 polymer
We report high-resolution far-infrared transmittance measurements and quantum-molecular-dynamics calculations of the two-dimensional tetragonal (7) high-temperature/high-pressure C-60 polymer, as a complement to our previous work on the C-60 dimer, and the one-dimensional orthorhombic (O) and two-dimensional rhombohedral (R) C-60 Polymers [V. C. Long et at., Phys. Rev. B 61, 13 191 (2000)]. The spectral features are assigned as intramolecular modes according to our quantum-molecular-dynamics calculations. In addition, we determine the I-h C-60 parent symmetry of each polymer vibrational mode by expanding the calculated polymer eigenvectors in terms of our calculated eigenvectors for I-h C-60. We find that many of the T-polymer vibrational modes are derived from more than one I-h C-60 parent symmetry, confirming that a weak perturbation model is inadequate for these covalently bonded C-60 balls. In particular, strongly infrared-active T-polymer modes with frequencies of 606 and 610 cm(-1) are found to be derived from a linear combination of three or more I-h C-60 parent modes. As in the O and R polymers, modes of the T polymer with substantial T-1u(2) character, which are polarized in the stretched directions, are found to have large downshifts. Finally, in our comparison of theory with experiment, we find indications that the in-plane lattice of the T polymer may not actually be square
Vörs-Máriaasszonysziget őskori lelőhely interdiszciplináris feldolgozása = Vörs-Máriaasszonysziget - an interdisciplinary study of the prehistoric site
Az OTKA T-046297 program a Vörs-Máriaasszonysziget, többperiĂłdusĂş lelĹ‘hely Ĺ‘skori anyagának rĂ©gĂ©szeti, tĂ©rinformatikai Ă©s termĂ©szettudományos feldolgozását vĂ©gezte el. KiemelkedĹ‘ jelentĹ‘sĂ©gű a koraneolitikus leletanyag (StarÄŤevo kultĂşra). A terĂĽleten további 7 rĂ©gĂ©szeti korszak emlĂ©kanyaga is elĹ‘kerĂĽlt. ElkĂ©szĂĽlt a lelĹ‘hely rĂ©gĂ©szeti, környezetrĂ©gĂ©szeti Ă©s archeometriai feldolgozása. Az adatokat tĂ©rinformatikai alapĂş rendszerbe rögzĂtettĂĽk. A kerámia leletekrĹ‘l rajzok Ă©s fotĂłk kĂ©szĂĽltek, összesen 230 db A3 fotomontázs táblán elhelyezve. Dokumentáltuk a kĂ©szĂtĂ©stechnikát, kĂsĂ©rletekkel alátámasztva. A kerámia anyagon rĂ©szletes petroarcheolĂłgiai vizsgálatok kĂ©szĂĽltek. További petroarcheolĂłgiai vizsgálatok kĂ©szĂĽltek a paticsokon Ă©s a kĹ‘anyagon. ElkĂ©szĂĽlt a lelĹ‘hely környezet-rĂ©gĂ©szeti feldolgozása. A lelĹ‘hely objektumaibĂłl 77 zsák mintát iszapoltunk le (1389 l). A lelĹ‘helyen Ă©s környezetĂ©ben talajtani/palinolĂłgiai sekĂ©ly fĂşrásokat mĂ©lyĂtettĂĽnk (összesen 17 fĂşrás). A mintákon palinolĂłgiai, szedimentolĂłgiai, mikro- Ă©s makrobotanikai, malakolĂłgiai Ă©s archeozoolĂłgiai vizsgálatok kĂ©szĂĽltek. A lelĹ‘helyrĹ‘l kĂ©t neolit korĂş temetkezĂ©s kerĂĽlt elĹ‘, a csontvázakon antropolĂłgiai, DNA Ă©s C-14 vizsgálatok kĂ©szĂĽltek. További, összesen 12 C-14 vizsgálat kĂ©szĂĽlt a lelĹ‘hely zárt objektumaibĂłl származĂł állatcsont Ă©s faszĂ©n maradványokon. A beĂ©rkezett jelentĂ©seket (összesen 15 jelentĂ©s) monografikus formában, angol nyelven, a dokumentáciĂłs anyagot DVD-n jelentetjĂĽk meg, várhatĂłan 2009-ben | The OTKA T-046297 program has accomplished the archaeological and natural scientific elaboration of the prehistoric material from Vörs-Máriaasszonysziget multi-period site. Outstanding part of the material is the legacy of the Early Neolithic StarÄŤevo culture. Apart from the Early Neolithic, remains of 7 archaeological cultures have been documented. Archaeological, environmental archaeological and archaeometrical investigation of the site was accomplished. Data were registered in a GIS system. The pottery was consered and presented on drawings and photos. Altogether 230 A3 size photo-montage plates were compiled. Production techniques were also investigated supported by experimental archaeology approach. Detailed petroarcheological research was performed on the pottery, daub and the lithic finds. Environmental archaeological study of the site was made on 77 sacks of silted soil samples (1389 l) and 17 shallow (hand) boreholes for sedimentological and palinological analysis. Palinological, sedimentological, micro- and macrobotanical, malacological and archaeozoological investigations were carried out. Two Neolithic burials were found on the site, the skeletons were submitted to anthropological, DNA and C-14 studies. Further 12 C-14 studies were made on bone and charcoal samples of the closed features. We are planning to publish results in English in monographic form with a DVD attached on the documentation and illustrations, probably in 2009
Investigating the Social Return on Technical Investments
In this paper, we examine the importance of the use of the social Return of Investment (SROI) method by investors, company managers in the evaluation of a particular technical investment or activity. The SROI analysis method differs from other financial valuation methods because it collects and analyses information about the social value of the resources used by the activities. In most cases, the economic analysis of investments does not contain such information, and neither such that would examine the impact of these resources on society. As a result of the SROI analysis, qualitative, quantitative and financial data are available on the project, providing the end-user with information on the social values of the examined investment. This issue is particularly important for environmental investments financed by the European Union
Proteoglycan Aggrecan Conducting T Cell Activation and Apoptosis in a Murine Model of Rheumatoid Arthritis
Rheumatoid arthritis (RA) is a systemic autoimmune disease and its targeting of the joints indicates the presence of a candidate autoantigen(s) in synovial joints. Patients with RA show immune responses in their peripheral blood to proteoglycan (PG) aggrecan. One of the most relevant animal models of RA appears to be proteoglycan-induced arthritis (PGIA), and CD4+ T cells seem to play a crucial role in the initiation of the disease. In this review, the role of various T cell epitopes of aggrecan in the induction of autoreactive T cell activation and arthritis is discussed. We pay special attention to two critically important arthritogenic epitopes, 5/4E8 and P135H, found in the G1 and G3 domains of PG aggrecan, respectively, in the induction of autoimmune arthritis. Finally, results obtained with the recently developed PG-specific TCR transgenic mice system showed that altered T cell apoptosis, the balance of activation, and apoptosis of autoreactive T cells are critical factors in the development of autoimmunity
Development of proteoglycan-induced arthritis depends on T cell-supported autoantibody production, but does not involve significant influx of T cells into the joints
Vidra (Lutra lutra) populáciĂłk genetikai analĂzisĂ©nek hazai elĹ‘zetes eredmĂ©nyei mikroszatellit polimorfizmus alapján
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