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排序方式: 共有118条查询结果,搜索用时 15 毫秒
111.
W.J. Briscoe Jason Brudvik K.G. Fissum K. Hansen L. Isaksson M. Lundin B. Nilsson B. Schroder 《中国物理 C》2009,33(12):1159-1166
The upgrade of the MAX-lab injector and the construction of MAX Ⅲ, provided the opportunity for upgrading the tagged-photon facility and thus lead to the possibility of more extensive program in nuclear physics research. This upgrade increased the injected electron energy to an eventual maximum of 250 MeV and allows for the extraction of electrons from the MAX Ⅰ ring operated in the stretcher mode. The first stretched beam was delivered in September 2005. The tagged-photon facility was commissioned in parallel with the commissioning of new experimental equipment. The PAC approved experimental program is current in progress, including measurements of pion photoproduction below the △(1232). The efforts at the tagged photon-facility are pursued within an international collaboration with around fifty members. 相似文献
112.
FTIR Study of the Thermal Degradation of Poly(vinyl Alcohol) 总被引:2,自引:0,他引:2
P. S. Thomas J.-P. Guerbois G. F. Russell B. J. Briscoe 《Journal of Thermal Analysis and Calorimetry》2001,64(2):501-508
The degradation of poly(vinyl alcohol) was investigated using TG analysis and Fourier transform infrared spectroscopy to determine
the effect of atmosphere on the process of degradation. In the spectra, four vibrational modes were identified that characterised
the major steps of the degradation process. These were the O-H, C-H, C=O and C=C stretching modes. The mechanism observed
for degradation in an inert atmosphere was in accordance with the accepted mechanism of elimination followed by pyrolisation.
Evidence of conjugated polyenes, however, was not observed. For the air atmosphere, oxidation in both steps of the degradation
process was observed.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
113.
T. Iqbal B. J. Briscoe S. Yasin P. F. Luckham 《Journal of Macromolecular Science: Physics》2014,53(9):1522-1532
A systematic experimental study of the large strain surface mechanical properties of a number of polymers {polymethylmethacrylate (PMMA), polyetheretherketone (PEEK), polystyrene (PS), polycarbonate (PC), polypropylene (PP), and ultra-high molecular weight polyethylene (UHMWPE)} at the nanometer scale is described. The polymeric surfaces were indented and the data were analyzed using a contact compliance method in conjunction with a nano-indenter system. The indentation experiments were performed using a Berkovich Tip indenter with a continuous contact compliance indentation mode. The indentations were performed using a constant loading rate (300 μN/sec) to a maximum penetration depth of 5 μm. The experimental results showed a considerable strain-rate hardening effect for the polymers and a peculiarly harder response of these surfaces at the near-to-surface (submicron) layers. PMMA was the hardest polymer of the selection, whereas UHMWPE and PP were observed to be the softest polymers. The paper includes practical consideration of a creeping effect and appropriateness of tip calibration using harder surfaces for nanoindentation experimentation of polymers. 相似文献
114.
Indentation is a comparatively simple and virtually nondestructive method of determining mechanical properties of material surfaces by means of an indenter inducing a localized deformation. The paper present experimental results of the load-displacement curves, the hardness and the elastic modulus data, and associated analysis for poly(methyl methacrylate) (PMMA) surfaces as a function of contact displacement. The experimental results include continuous stiffness indentations performed using constant loading rate and constant displacement rate experiments. The continuous stiffness indentation involves continuous calculation of a material stiffness, and hence hardness and elastic modulus of surfaces, during discrete loading-unloading cycles, as in a conventional indentation routine, and in a comparatively smaller time constant. The dependence of the compliance curves, the hardness, the elastic modulus and the plasticity index upon the imposed penetration depth, the applied normal load and the deformation rate are described. Tip area and load frame calibrations for the continuous stiffness indentation are also reported. The paper includes practical considerations encountered during indentation of polymers specifically at low penetration depths. The experimental results show a peculiarly harder response of PMMA surfaces at the submicron (near to surface) layers. 相似文献
115.
Tarbert CM Watts DP Aguar P Ahrens J Annand JR Arends HJ Beck R Bekrenev V Boillat B Braghieri A Branford D Briscoe WJ Brudvik J Cherepnya S Codling R Downie EJ Föhl K Glazier DI Grabmayr P Gregor R Heid E Hornidge D Jahn O Kashevarov VL Knezevic A Kondratiev R Korolija M Kotulla M Krambrich D Krusche B Lang M Lisin V Livingston K Lugert S Macgregor IJ Manley DM Martinez M McGeorge JC Mekterovic D Metag V Nefkens BM Nikolaev A Novotny R Owens RO Pedroni P Polonski A Prakhov SN Price JW Rosner G 《Physical review letters》2008,100(13):132301
We present the first detailed measurement of incoherent photoproduction of neutral pions to a discrete state of a residual nucleus. The 12C(gamma,pi(0))(12)C*(4.4 MeV) reaction has been studied with the Glasgow photon tagger at MAMI employing a new technique which uses the large solid angle Crystal Ball detector both as a pi(0) spectrometer and to detect decay photons from the excited residual nucleus. The technique has potential applications to a broad range of future nuclear measurements with the Crystal Ball and similar detector systems elsewhere. Such data are sensitive to the propagation of the Delta in the nuclear medium and will give the first information on matter transition form factors from measurements with an electromagnetic probe. The incoherent cross sections are compared to two theoretical predictions including a Delta-hole model. 相似文献
116.
Girod FX Niyazov RA Avakian H Ball J Bedlinskiy I Burkert VD De Masi R Elouadrhiri L Garçon M Guidal M Jo HS Joo K Kubarovsky V Kuleshov SV MacCormick M Niccolai S Pogorelko O Sabatié F Stepanyan S Stoler P Ungaro M Zhao B Amaryan MJ Ambrozewicz P Anghinolfi M Asryan G Bagdasaryan H Baillie N Ball JP Baltzell NA Batourine V Battaglieri M Bellis M Benmouna N Berman BL Biselli AS Blaszczyk L Bouchigny S Boiarinov S Bradford R Branford D Briscoe WJ Brooks WK Bültmann S Butuceanu C Calarco JR 《Physical review letters》2008,100(16):162002
The beam-spin asymmetries in the hard exclusive electroproduction of photons on the proton (e p-->epgamma) were measured over a wide kinematic range and with high statistical accuracy. These asymmetries result from the interference of the Bethe-Heitler process and of deeply virtual Compton scattering. Over the whole kinematic range (x(B) from 0.11 to 0.58, Q2 from 1 to 4.8 GeV2, -t from 0.09 to 1.8 GeV2), the azimuthal dependence of the asymmetries is compatible with expectations from leading-twist dominance, A approximately a sinphi/(1+c cosphi). This extensive set of data can thus be used to constrain significantly the generalized parton distributions of the nucleon in the valence quark sector. 相似文献
117.
A. A. Christman W. D. Block J. Schultz H. V. A. Briscoe und J. W. Matthews 《Fresenius' Journal of Analytical Chemistry》1939,117(7-8):276
Ohne Zusammenfassung 相似文献
118.