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101.
A Bohlin E Nordström BD Patterson PE Bengtsson CJ Kliewer 《The Journal of chemical physics》2012,137(7):074302
S-branch N(2)-H(2) Raman linewidths have been measured in the temperature region 294-1466 K using time-resolved dual-broadband picosecond pure rotational coherent anti-Stokes Raman spectroscopy (RCARS). Data are extracted by mapping the dephasing rates of the CARS signal temporal decay. The J-dependent coherence decays are detected in the time domain by following the individual spectral lines as a function of probe delay. The linewidth data set was employed in spectral fits of N(2) RCARS spectra recorded in binary mixtures of N(2) and H(2) at calibrated temperature conditions up to 661 K using a standard nanosecond RCARS setup. In this region, the set shows a deviation of less than 2% in comparison with thermocouples. The results provide useful knowledge for the applicability of N(2) CARS thermometry on the fuel-side of H(2) diffusion flames. 相似文献
102.
Horvath I Weise CF Andersson EK Chorell E Sellstedt M Bengtsson C Olofsson A Hultgren SJ Chapman M Wolf-Watz M Almqvist F Wittung-Stafshede P 《Journal of the American Chemical Society》2012,134(7):3439-3444
Small organic molecules that inhibit functional bacterial amyloid fibers, curli, are promising new antibiotics. Here we investigated the mechanism by which the ring-fused 2-pyridone FN075 inhibits fibrillation of the curli protein CsgA. Using a variety of biophysical techniques, we found that FN075 promotes CsgA to form off-pathway, non-amyloidogenic oligomeric species. In light of the generic properties of amyloids, we tested whether FN075 would also affect the fibrillation reaction of human α-synuclein, an amyloid-forming protein involved in Parkinson's disease. Surprisingly, FN075 stimulates α-synuclein amyloid fiber formation as measured by thioflavin T emission, electron microscopy (EM), and atomic force microscopy (AFM). NMR data on (15)N-labeled α-synuclein show that upon FN075 addition, α-synuclein oligomers with 7 nm radius form in which the C-terminal 40 residues remain disordered and solvent exposed. The polypeptides in these oligomers contain β-like secondary structure, and the oligomers are detectable by AFM, EM, and size-exclusion chromatography (SEC). Taken together, FN075 triggers oligomer formation of both proteins: in the case of CsgA, the oligomers do not proceed to fibers, whereas for α-synuclein, the oligomers are poised to rapidly form fibers. We conclude that there is a fine balance between small-molecule inhibition and templation that depends on protein chemistry. 相似文献
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M. Bengtsson R. Grnlund M. Sjholm Ch. Abrahamsson A.D. Dernfalk S. Wallstrm A. Larsson P. Weibring S. Karlsson S.M. Gubanski S. Krll S. Svanberg 《Optics and Lasers in Engineering》2005,43(6):624-632
Remote fluorescence imaging of fungal growth on polymeric high-voltage insulators was performed using a mobile lidar system with a laser wavelength of 355 nm. Insulator areas contaminated by fungal growth could be distinguished from clean surfaces and readily be imaged. The experiments were supported by detailed spectral studies performed in laboratory using a fibre-optic fluorosensor incorporating an optical multi-channel analyser system (OMA) and a nitrogen laser emitting radiation at 337 nm. 相似文献
106.
Selective growth of individual multiwalled carbon nanotubes 总被引:1,自引:0,他引:1
R. E. Morjan M. S. Kabir S. W. Lee O. A. Nerushev P. Lundgren S. Bengtsson Y. W. Park E. E. B. Campbell 《Current Applied Physics》2004,4(6):591-594
Growth of individual, vertically aligned multiwalled carbon nanotubes (VACNT) on patterned Si wafers using dc plasma-enhanced CVD is described. The selective growth of individual VACNT within larger holes etched in Si is demonstrated for the first time. 相似文献
107.
Dmitri Riabov Eduard Hryha Masoud Rashidi Sven Bengtsson Lars Nyborg 《Surface and interface analysis : SIA》2020,52(11):694-706
The initial oxide state of powder is essential to the robust additive manufacturing of metal components using powder bed fusion processes. However, the variation of the powder surface oxide composition as a function of the atomizing medium is not clear. This work summarizes a detailed surface characterization of three 316L powders, produced using water atomization (WA), vacuum melting inert gas atomization (VIGA), and nitrogen atomization (GA). X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy analyses were combined to characterize the surface state of the powders. The results showed that the surface oxides consisted of a thin (~4 nm) iron oxide (Fe2O3) layer with particulate oxide phases rich in Cr, Mn, and Si, with a varying composition. XPS analysis combined with depth-profiling showed that the VIGA powder had the lowest surface coverage of particulate compounds, followed by the GA powder, whereas the WA powder had the largest fraction of particulate surface oxides. The composition of the oxides was evaluated based on the XPS analysis of the oxide standards. Effects of Ar sputtering on the peak positions of the oxide standards were evaluated with the aim of providing an accurate analysis of the oxide characteristics at different etch depths. 相似文献
108.
A. Al-Khatib H. Hübel P. Bringel C. Engelhardt A. Neußer-Neffgen G. B. Hagemann C. R. Hansen B. Herskind G. Sletten A. Bracco F. Camera G. Benzoni P. Fallon R. M. Clark M. P. Carpenter R. V. F. Janssens T. L. Khoo T. Lauritsen P. Chowdhury H. Amro A. K. Singh R. Bengtsson 《The European Physical Journal A - Hadrons and Nuclei》2008,36(1):21-29
Excited states in 124Xe were populated in the reaction 82Se(48Ca, 6n)124Xe and γ -ray coincidence relationships were measured with the Gammasphere spectrometer. Two new bands are observed and several
of the previously known bands are extended in the high- as well as in the low-spin region. Two irregular high-spin structures
are also added. The irregularities are a fingerprint of a transition from collective to non-collective behaviour. Configuration
assignments to the new structures are proposed on the basis of systematics and by comparing experimental properties with calculations
within the framework of the cranking model. 相似文献
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