200,727 research outputs found
Regioregular Poly(3-octylthiophene): Diffraction studies and computational modeling
No full textPoly(3-alkylthiophenes) are one of the most widely used polymers for organic photovoltaics. The scarcity of detailed atomistic models1-3 for these compounds has impaired the modeling and development of such organic devices. In this communication we will show interesting results on poly(3-octylthiophene) (P3OT) and its polymorphs. Diffraction studies of highly crystalline thin films samples and computational modeling, with molecular mechanics and density functional theory methods, both developed within our group, were used to assess conformation and packing energy of P3OT in its two polymorphs, form I and form II. Their relative stability will also be discussed and placed in the context4-6 of poly(3-alkylthiophenes) polymorphism.
AKNOWLEDGMENTS ICS CNRS Strasbourg
REFERENCES
(1) Arosio, P.; Famulari, A.; Moreno, M.; Raos, G.; Catellani, M.; Meille, S. V. Chem. Mater. 2009, 21, 78-87.
(2) Buono A., Son N.H., Raos G., Gila L., Cominetti A., Catellani M., Meille S.V., Macromolecules 2010, 43, 6772-6781.
(3) Kayunkid, N.; Uttiya, S.; Brinkmann, M.; Macromolecules, 2010, 43, 4961–4967.
(4) Prosa, T. J.; Winokur, M.; McCulloch, R. D.; Macromolecules, 1996, 29, 3654–3656.
(5) Rahimi, K.; Botiz, J.; Stingelin, N.; Kayunkid, N. ; Sommer, M.; Koch, F. P. V.; Nguyen, H.; Coulembier, O.; DuBois, P.; Brinkmann, M.; Reiter, G.; Angew. Chem. Int. Ed., 2012, 51, 11131–11135
(6) Dudenko, D.; Kiersnowski, A.; Shu, J.; Pisula W.; Sebastiani, D.; Spiess H. W.; Hansen, M. R.; Angew. Chem. Int. Ed. 2012, 51, 1106
Polystilifera Brinkmann 1917
No full textOrder Polystilifera Brinkmann, 1917 One polystiliferan nemertean was collected at 950 m depth from non-seep seamount habitat at Cocos Canyon (SIO-BIC N263). The specimen is 65 mm long and dorso-ventrally flattened. The body is translucent and coloration is pale pinkish (Fig. 3D–E). This reptant hoplonemertean is sister to another undescribed Reptantia Brinkmann, 1917 from the Kuril Islands (500 m depth). Together with three further unidentified hadal reptant hoplonemerteans, this clade is sister to Pelagica Brinkmann, 1917 (Fig. 6). Again, we choose not to name this species as a thorough taxonomic revision of Reptantia is warranted. The histological data set is published herein: https://doi.org/10.5281/zenodo.6375286.Published as part of Sagorny, Christina, Döhren, Jörn von, Rouse, Greg W. & Tilic, Ekin, 2022, Cutting the ribbon: bathyal Nemertea from seeps along the Costa Rica margin, with descriptions of 2 new genera and 9 new species, pp. 132-174 in European Journal of Taxonomy 845 (1) on page 147, DOI: 10.5852/ejt.2022.845.1959, http://zenodo.org/record/725885
Entobdella brattstroemi Brinkmann 1952
No full textEntobdella brattstroemi Brinkmann, 1952 (Figs. 15H, 35) Type host and locality: Fine flounder, Paralichthys adspersus (Steindachner, 1867) (Pleuronectiformes: Paralichthyidae); Pacific Ocean, off coast of Chile, Golfo de Ancud, N of Isla Abtoa, 41°47'18" S, 73°20'55" W, depth 60 m (Brinkmann 1952a). Other locality: Coquimbo (approximately 29°57' S, 71°25' W), approximately 1300 km north of type locality. Specimens collected by Dr M. T. González (Entobdella sp. 2; Table 2). Site on host: Skin. Holotype: Adult specimen already designated by Brinkmann (1952a) (SMNH No.: LUCE type 3864; M107, 1 slide). Voucher specimens: 2 adult specimens (SAMA AHC No 29195, 2 slides) from P. adspersus off Coquimbo, Chile (Entobdella sp. 2: Table 2). Specimens studied: Holotype and voucher specimens listed above. Redescription (Fig. 35): See also Brinkmann (1952a). In present study, based on holotype and 2 vouchers (see above): total length 4403 (3971 – 5191) (n = 3); body width 3335 (2873 – 4003) (n = 3); haptor length and breadth 2265 (2045 – 2587) and 2345 (2088 – 2797) respectively (n = 3); length of accessory sclerite 312 (282 – 355) (n = 5); length of anterior hamulus 877 (698 – 963) (n = 5); length of posterior hamulus 146 (121 – 170) (n = 4); pharynx length and width 428 (345 – 500) and 635 (478 – 738) respectively (n = 3); testis length and width 286 (250 – 331) and 536 (506 – 563) respectively (n = 3). Accessory sclerites stout with strongly developed and characteristically shaped flanges along inner and outer borders of curved distal third (Figs. 15H, 35B). Outer flange wider than inner flange. Differential diagnosis: Distinguished from other Entobdella spp. by characteristic shape of accessory sclerites (Figs. 15H, 35B). On skin of Paralichthys adspersus. Comments. The holotype of E. brattstroemi is in a poor condition – in particular the shapes of the accessory sclerites are hard to resolve. The 2 specimens donated by Dr González (Entobdella sp. 2; Table 2) are in good condition and are lodged as vouchers at the SAMA (see above). The type locality is approximately 1300 km south of Coquimbo where Dr González collected her specimens. Although the specimens recently acquired by us came from a locality 1300 km north of the type locality, they are from the same host as Brinkmann's specimen, namely Paralichthys adspersus, and this, together with the similarly shaped accessory sclerites, indicates that the 3 studied specimens are conspecific.Published as part of Kearn, Graham C., Whittington, Ian D. & Evans-Gowing, Richard, 2007, A revision of Entobdella Blainville in Lamarck, 1818, with special emphasis on the nominal (type) species " Entobdella hippoglossi (Müller, 1776) Blainville, 1818 " (Monogenea: Capsalidae: Entobdellinae) from teleost flatfishes, with descriptions of three new species and a new genus, pp. 1-54 in Zootaxa 1659 on pages 44-4
Starobinsky Inflation from String Theory?
No full textStarobinsky inflation is currently one of the best models concerning
agreement with cosmological data. Despite this observational success, it is
still lacking a robust embedding into a UV complete theory. Previous efforts to
derive Starobinsky inflation from string theory have been based on the
derivation of higher derivative curvature terms from the low-energy limit of
ten-dimensional string theory. This approach is however known to fail due to
the difficulty to tame the effect of contributions proportional to the Ricci
scalar to a power larger than two. In this paper we investigate an alternative
attempt which exploits instead the ubiquitous presence of scalar fields in
string compactifications combined with the fact that Starobinsky inflation can
be recast as Einstein gravity coupled to a scalar field with a precise
potential and conformal coupling to matter fermions. We focus in particular on
type IIB K\"ahler moduli since they have shown to lead to exponential
potentials with a Starobinsky-like plateau. We consider three classes of moduli
with a different topological origin: the volume modulus, bulk fibre moduli, and
blow-up modes. The only modulus with the correct coupling to matter is the
volume mode but its potential does not feature any plateau at large field
values. Fibre moduli admit instead a potential very similar to Starobinsky
inflation with a natural suppression of higher curvature corrections, but they
cannot reproduce the correct conformal coupling to matter. Blow-up modes have
both a wrong potential and a wrong coupling. Our analysis implies therefore
that embedding Starobinsky inflation into string theory seems rather hard.
Finally, it provides a detailed derivation of the coupling to matter of fibre
moduli which could be used as a way to discriminate Starobinsky from fibre
inflation.Comment: 24 pages, 4 figure
Supplemental Material - The ethnic penalty in welfare deservingness: A factorial survey experiment on welfare chauvinism in pension attitudes in Germany
No full textSupplemental Material for The ethnic penalty in welfare deservingness: A factorial survey experiment on welfare chauvinism in pension attitudes in Germany by Elias Naumann, Marvin M Brinkmann and Katja Möhring in Journal of European Social Policy</p
“The tasks of school or: What good brings the school actually?” The systematical attempt of the phenomenology of school
No full text“The tasks of school or: What good brings the school actually?” The systematical attempt of the phenomenology of school. – This article analyzes the issue of school in the context of phenomenology. In a theoretical manner also tries to gain an insight into the thinking of Eugen Fink and J. M. Langeveld. The school is characterized as a place with a specific institutionally organized teaching practice and own teaching logic, which is in many ways different from other social disciplines and institutions. Brinkmann with Langeveld explain on educational and theoretical base the educational activities as a didactic component, which is causing productions of educational questions exceeding the scope of social issues, time and space of the pedagogical schedule. Finally, with Fink explains Brinkmann the socio-theoretical perspective defining of educational interaction and communication in terms of staged teaching practice in schools and in the conditions of dynamically developing science and technology (postmodernism), as well as in conflict pluralistic postdemocracy
Überprüfung des Insolvenzanfechtungsrechts durch Bundesregierung ergibt: Es fehlt an Fiskusprivilegien!
No full textBrinkmann M, Thole C, Jacoby F. Überprüfung des Insolvenzanfechtungsrechts durch Bundesregierung ergibt: Es fehlt an Fiskusprivilegien!. ZIP - Zeitschrift für Wirtschaftsrecht. 2015;36(42):2001-2002
Influence of the wall heat losses on the performance of a network of nonstationary catalytic burners
No full text- …
