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51.
Hermes Huang Chetan Shende Atanu Sengupta Frank Inscore Carl Brouillette Wayne Smith Stuart Farquharson 《Journal of Raman spectroscopy : JRS》2012,43(6):701-705
Many trace chemical analyses are being transitioned from the lab to the field, among which is surface‐enhanced Raman spectroscopy. Although initial portable Raman analyzers primarily employ 785 nm laser excitation, recent studies suggest longer wavelengths, with an appropriate surface‐enhanced Raman‐active substrate, may provide equal sensitivity. Furthermore, 1550 nm excitation may provide added safety for the user, in that permanent retina damage does not occur. Here, we show that a reasonable enhancement factor can be obtained for melamine using 1550 nm laser excitation that is nearly equivalent to those obtained using 785 and 1064 nm laser excitation. We also demonstrate that a number of other chemicals of interest can be measured by 1550 nm surface‐enhanced Raman scattering, albeit only modest sensitivity is achieved because of instrument limitations, not enhancement factors. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
52.
Stefan Linsinger Selcan Tuncel Wilfried Hermes Matthias Eul Bernard Chevalier Rainer Pöttgen Prof. Dr. 《无机化学与普通化学杂志》2009,635(2):282-286
The rare earth‐rich compounds RE23Rh7Mg4 (RE = La, Ce, Pr, Nd, Sm, Gd) were prepared by induction‐melting the elements in sealed tantalum tubes. The new compounds were characterized by X‐ray powder diffraction. They crystallize with the hexagonal Pr23Ir7Mg4 type structure, space group P63mc. The structures of La23Rh7Mg4 (a = 1019.1(1), c = 2303.7(4) pm, wR2 = 0.0827, 1979 F2 values, 69 variables), Nd23Rh7Mg4 (a = 995.4(2), c = 2242.3(5) pm, wR2 = 0.0592, 2555 F2 values, 74 variables) and Gd23Rh6.86(5)Mg4 (a = 980.5(2), c = 2205.9(5) pm, wR2 = 0.0390, 2083 F2 values, 71 variables) were refined from single crystal X‐ray diffractometer data. The three crystallographically different rhodium atoms have trigonal prismatic rare earth coordination with short RE–Rh distances (283–300 pm in Nd23Rh7Mg4). The prisms are condensed via common edges, leading to a rigid three‐dimensional network in which isolated Mg4 tetrahedra (312–317 pm Mg–Mg in Nd23Rh7Mg4) are embedded. Temperature dependent magnetic susceptibility data of Ce23Rh7Mg4 indicate Curie‐Weiss behavior with an experimental magnetic moment of 2.52(1) μB/Ce atom, indicative for stable trivalent cerium. Antiferromagnetic ordering is evident at 2.9 K. 相似文献
53.
54.
F. Hermes E.W. Jasper H.E. Kurz T. Mayer-kuckuk P.F.A. Goudsmit H. Arnold 《Nuclear Physics A》1974,228(1):175-179
Excitation functions for the reactions and were measured at bombarding energies up to 75 MeV. The data are compared to the results of an equilibrium statistical model calculation including angular momentum conservation and γ-ray competition. Satisfactory agreement was found except for the high energy tails. 相似文献
55.
We propose a new perturbation approach to finitesize effects within the 4 field theory for a one-component order parameter with periodic boundary conditions. Our approach is applicable both above and belowT
c
. Renormalization-group calculations of finite-size scaling functions in three dimensions are compared with new Monte Carlo data for theL×L×L Ising model withL=8, 16, 32. The field-theoretic predictions are in good overall agreement with the Monte Carlo data.Dedicated to Professor Herbert Wagner on the occasion of his 60th birthday 相似文献
56.
57.
F. Risse W. Bertl P. David H. Hänscheid E. Hermes J. Konijn C. T. A. M. de Laat H. Pruys Ch. Rösel W. Schrieder A. Taal D. Vermeulen 《Zeitschrift für Physik A Hadrons and Nuclei》1991,339(4):427-433
The probabilities of muon attachment to fission fragments in the prompt fission of237Np have been determined as a function of fragment mass and total kinetic energy release in a (
–,f
1
f
2
e
–)-coincidence measurement. A strong dependence of the attachment probability on the fragment mass is observed. The experimental results are compared with theoretical predictions.It is a pleasure to thank Professor T. Mayer-Kuckuk for his co-operation in performing the project. We gratefully acknowledge the permanent support of Professor J.P. Blaser and his staff at PSI. We thank Professor R. Engfer, Dr. A.v.d. Schaaf, and Dr. H.C. Walter for their support in using the electron spectrometer SIN-DRUM I. We are thankful to Professor S. Polikanov (GSI) and to Dr. T. Krogulski (University of Warsaw, Bialystok) for intensive and fruitful discussions. We appreciate the collaboration of Professor W. Müller and Dr. J. Pauwels (CBNM-Mol) in the target preparation. This work has been funded by the German Federal Minister for Research and Technology (BMFT) under the contract number 06BN271 (PD, HH, FR, ChR, WS). We thank the following institutions and organisations for financial support: Foundation for Fundamental Research on Matter (FOM), the Netherlands Organisation of the Advancement of Pure Research (NWO) (JK, CdL, AT), and the Swiss National Foundation (SNF) (WB, EH; HP, DV). One of the authors is grateful for a fellowship granted by the Studienstiftung des deutschen Volkes (FR). 相似文献
58.
Ihor R. Muts Vasyl I. Zaremba Dr. Ute Ch. Rodewald Wilfried Hermes Rainer Pöttgen Prof. Dr. 《无机化学与普通化学杂志》2007,633(15):2725-2729
The metal‐rich indides Ca2Pd2In and Ca2Pt2In were synthesised from the elements in sealed tantalum ampoules in an induction furnace. Both samples were investigated by X‐ray powder and single crystal diffraction: HT‐Pr2Co2Al type, C2/c, a = 1017.6(5), b = 574.1(3), c = 812.7(3) pm, β = 104.54(2)°, wR2 = 0.0344, 590 F2 values for Ca2Pd2In and a = 1004.3(3), b = 568.9(1), c = 813.1(2) pm, β = 104.25(2)°, wR2 = 0.0435, 654 F2 values for Ca2Pt2In with 25 variables per refinement. The structure contain Pd2 (272 pm) and Pt2 (264 pm) dumb‐bells with a trigonal prismatic coordination for each transition metal atom. These AlB2 related slabs are condensed via common edges. Together the palladium and indium atoms build up three‐dimensional [Pd2In] and [Pt2In] polyanionic networks in which the calcium atoms fill larger channels. The bonding of calcium to the network proceeds via shorter Ca–Pd and Ca–Pt contacts. Ca2Pd2In and Ca2Pt2In are Pauli paramagnets. 相似文献
59.
Paulo Emilio Feuser Amanda Virtuoso Jacques Juan Marcelo Carpio Arévalo Maria Eliane Merlin Rocha Maria Claudia dos Santos-Silva Claudia Sayer Pedro H. Hermes de Araújo 《Journal of nanoparticle research》2016,18(4):104
The encapsulation of superparamagnetic nanoparticles (MNPs) in polymeric nanoparticles (NPs) with modified surfaces can improve targeted delivery and induce cell death by hyperthermia. The goals of this study were to synthesize and characterize surface modified superparamagnetic poly(methyl methacrylate) with folic acid (FA) prepared by miniemulsion polymerization (MNPsPMMA-FA) and to evaluate their in vitro cytotoxicity and cellular uptake in non-tumor cells, murine fibroblast (L929) cells and tumor cells that overexpressed folate receptor (FR) β, and chronic myeloid leukemia cells in blast crisis (K562). Lastly, hemolysis assays were performed on human red blood cells. MNPsPMMA-FA presented an average mean diameter of 135 nm and a saturation magnetization (Ms) value of 37 emu/g of iron oxide, as well as superparamagnetic behavior. The MNPsPMMA-FA did not present cytotoxicity in L929 and K562 cells. Cellular uptake assays showed a higher uptake of MNPsPMMA-FA than MNPsPMMA in K562 cells when incubated at 37 °C. On the other hand, MNPsPMMA-FA showed a low uptake when endocytosis mechanisms were blocked at low temperature (4 °C), suggesting that the MNPsPMMA-FA uptake was mediated by endocytosis. High concentrations of MNPsPMMA-FA showed hemocompatibility when incubated for 24 h in human red blood cells. Therefore, our results suggest that these carrier systems can be an excellent alternative in targeted drug delivery via FR. 相似文献
60.
U. Sennhauser L. Felawka T. Kozlowski H.K. Walter F.W. Schlepuetz R. Engfer E.A. Hermes P. Heusi H.P. Isaak H.S. Pruys A. Zglinski W.H.A. Hesselink 《Physics letters. [Part B]》1981,103(6):409-412
A particle unstable state of 4H has been identified in the reaction by observing the two emitted tritons. A resonance energy EΓ=(2.7±0.6) MeV and a reduced width γ2=(2.3±0.6) MeV were deduced, in agreement with the parameters of the ground-state level (Jπ=2?) found in the p-wave of n-t-scattering. The yield per stopped pion is (5.6±1.8)×10?4. Previous measurements in pion absorption are in disagreement with our results. 相似文献