排序方式: 共有7条查询结果,搜索用时 15 毫秒
1
1.
D. Babusci H. Czy? F. Gonnella S. Ivashyn M. Mascolo R. Messi D. Moricciani A. Nyffeler G. Venanzoni KLOE-?Collaboration 《The European Physical Journal C - Particles and Fields》2012,72(3):1917
A possibility of KLOE-2 experiment to measure the width
\varGammap0 ?gg\varGamma_{\pi^{0} \to\gamma\gamma} and the π
0
γγ
∗ form factor F(Q
2) at low invariant masses of the virtual photon in the space-like region is considered. This measurement is an important test
of the strong interaction dynamics at low energies. The feasibility is estimated on the basis of a Monte-Carlo simulation.
The expected accuracy for
\varGammap0 ?gg\varGamma_{\pi^{0} \to\gamma\gamma} is at a per cent level, which is better than the current experimental world average and theory. The form factor will be measured
for the first time at Q
2≤0.1 GeV2 in the space-like region. The impact of these measurements on the accuracy of the pion-exchange contribution to the hadronic
light-by-light scattering part of the anomalous magnetic moment of the muon is also discussed. 相似文献
2.
Messi BB Ndjoko-Ioset K Hertlein-Amslinger B Lannang AM Nkengfack AE Wolfender JL Hostettmann K Bringmann G 《Molecules (Basel, Switzerland)》2012,17(5):6114-6125
A new flavanone-chromone biflavonoid, preussianone (1), has been isolated from the leaves of Garcinia preussii, along with four known biflavonoids. The absolute stereostructures were elucidated by chemical, spectroscopic, and chiroptical methods. The biological properties of the new biflavonoid against several bacterial strains were evaluated. 相似文献
3.
Claudia Messi P. Carniti Antonella Gervasini 《Journal of Thermal Analysis and Calorimetry》2008,91(1):93-100
A series of catalysts prepared by dispersing iron oxide on supports of different nature and acidity has been studied. Silica
(S) and silica-zirconia mixed oxides (SZ) with different ZrO2 content (from 5 to 45 mass%) were used as supports for the iron oxide phase which was deposited over them by an equilibrium-adsorption
method. The red-ox properties of the Fe-catalysts were studied by temperature programmed reduction (TPR) technique.
The two well defined and narrow TPR peaks observed could be associated with the reduction steps: I) Fe2O3→FeO and Fe2O3→Fe(0) (at ca. 400°C) and II) FeO→Fe(0) (at ca. 800–900°C). The temperature of the second-step-peak increased with the zirconia
content in the support, likely because of the stronger interaction of the iron oxide phase with the support. Activation parameters
for the two step-reduction processes were obtained by a simple computation procedure applied to the TPR profiles. 相似文献
4.
The KLOE- collaboration A. Anastasi D. Babusci G. Bencivenni M. Berlowski C. Bloise F. Bossi P. Branchini A. Budano L. Caldeira Balkest?hl B. Cao F. Ceradini P. Ciambrone F. Curciarello E. Czerwinski G. D’Agostini E. Danè V. De Leo E. De Lucia A. De Santis P. De Simone A. Di Cicco A. Di Domenico R. Di Salvo D. Domenici A. D’Uffizi A. Fantini G. Felici S. Fiore A. Gajos P. Gauzzi G. Giardina S. Giovannella E. Graziani F. Happacher L. Heijkenskj?ld W. Ikegami Andersson T. Johansson D. Kaminska W. Krzemien A. Kupsc S. Loffredo G. Mandaglio M. Martini M. Mascolo R. Messi S. Miscetti G. Morello D. Moricciani P. Moskal M. Papenbrock A. Passeri V. Patera E. Perez del Rio A. Ranieri P. Santangelo I. Sarra M. Schioppa M. Silarski F. Sirghi L. Tortora G. Venanzoni W. Wislicki M. Wolke 《Journal of High Energy Physics》2016,2016(5):19
5.
The CBELSA/TAPS Collaboration M. Nanova S. Friedrich V. Metag E. Ya. Paryev F. N. Afzal D. Bayadilov B. Bantes R. Beck M. Becker S. Böse K. -T. Brinkmann V. Crede P. Drexler H. Eberhardt D. Elsner F. Frommberger Ch. Funke M. Gottschall M. Grüner E. Gutz Ch. Hammann J. Hannappel J. Hartmann W. Hillert Ph. Hoffmeister Ch. Honisch T. Jude D. Kaiser F. Kalischewski I. Keshelashvili F. Klein K. Koop B. Krusche M. Lang K. Makonyi F. Messi J. Müller J. Müllers D. Piontek T. Rostomyan D. Schaab Ch. Schmidt H. Schmieden R. Schmitz T. Seifen V. Sokhoyan C. Sowa K. Spieker A. Thiel U. Thoma T. Triffterer M. Urban H. van Pee D. Walther Ch. Wendel D. Werthmüller U. Wiedner A. Wilson L. Witthauer Y. Wunderlich H. -G. Zaunick 《The European Physical Journal A - Hadrons and Nuclei》2018,54(10):182
6.
Joseph T. Ndongo Mark E. Issa Angelique N. Messi Muriel Cuendet Dieudonné E. Pegnyemb 《Natural product research》2015,29(17):1684-1687
Seven flavonoids, hemerocallone (1), 6,7-dimethoxy-3′,4′-dimethoxyisoflavone (2), amentoflavone (4), agathisflavone (6), cupressuflavone (8), robustaflavone (9) and epicatechin (10), together with three other compounds, lithospermoside (3), β-D-fructofuranosyl-α-D-glucopyranoside (5) and 3β-O-D-glucopyranosyl-β-stigmasterol (7), were isolated from the ethyl acetate extract of the stem bark of Ochna schweinfurthiana F. Hoffm. All the compounds were characterised by spectroscopic and mass spectrometric methods, and by comparison with literature data. Cytotoxicity of the extracts and compounds against cervical adenocarcinoma (HeLa) cells was evaluated by MTT assay. Compounds 4 and 6 exhibited good cytotoxic activity, with IC50 values of 20.7 and 10.0 μM, respectively. 相似文献
7.
Using Mössbauer spectroscopy we have investigated a set of Fe78?xNixSi8B14 amorphous alloys produced by melt spinning. The samples are all ferromagnetic at room temperature even for an iron concentration as low as 20 at. %. The most interesting observation is the evident asymmetry characterizing the Mossbauer fingerprints for x≦38. We suggest that this asymmetry mirros a change of the short range order. 相似文献
1