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排序方式: 共有66条查询结果,搜索用时 62 毫秒
1.
T. Butz Ch. Meinecke M. Morawski T. Reinert M. Schwertner D. Spemann J. Vogt 《Applied Surface Science》2005,252(1):43-48
This contribution deals with the morphological and elemental characterisation with high-energy (MeV) focused ion beams (in particular protons) with special emphasis on high spatial resolution in the sub-micrometer regime and very low minimum detection limits (sub-ppm) in trace element analysis. The most important methods like particle induced X-ray emission (PIXE), Rutherford backscattering spectrometry (RBS), as well as scanning transmission ion microscopy (STIM) and STIM-tomography will be illustrated by examples from material and life sciences. 相似文献
2.
F. Reinert P. Steiner Th. Engel S. Hüfner 《Zeitschrift für Physik B Condensed Matter》1995,99(2):223-227
Electron-energy loss spectra of potassium permanganate (KMnO4) with primary electron energies 25 eV<=E0<=500 eV show 7 peaks in the energy-loss range 1 eV<=ΔE<=10eV and are successfully analysed with a superposition of 7 independent Gaussians. The intensity of these lines follow roughly a power-law dependence on the primary energy I∝E 0 -α . There are two groups of lines, the first with an exponent α≈0.5, while the lines in the second group decay much stronger with increasingE 0 corresponding to a value 0.9<=α<=1.3. The 4 lines in the first group are identified as dipole allowed transitions by comparison to recent first principle molecular-orbital calculations for the (MnO4) molecule by H. Nakai et al. The dipole-allowed excitation spectrum obtained from this analysis agrees very well with these first principle calculations. 相似文献
3.
Hoebbel Dagobert Reinert Thomas Schmidt Helmut Arpac Ertugrul 《Journal of Sol-Gel Science and Technology》1997,10(2):115-126
The complexation degrees of Al-, Ti- and Zr-butoxide (M) with unsaturated and saturated -diketones (3-allylpentane-2.4-dione-APD, acetylacetone-ACAC) and -ketoesters (methacryloxyethyl-acetoacetate-MEAA, allylacetoacetate-AAA, ethylacetoacetate-EAA) as organic ligands (L) were examined by IR and 13 C NMR spectroscopy and were found to be L:M 1.5. The hydrolytic stability of the ligands of the metal alkoxide complexes (L:M = 1) during hydrolysis/condensation reactions at the molar ratio h (H2O : OR) = 0.5–2.0 decreases with increasing H
4.
Weinhardt L Fuchs O Batchelor D Bär M Blum M Denlinger JD Yang W Schöll A Reinert F Umbach E Heske C 《The Journal of chemical physics》2011,135(10):104705
We have employed a unique spectroscopic approach, a resonant inelastic soft x-ray scattering (RIXS) map, to identify and separate electron-hole correlation effects in core-level spectroscopy. With this approach, we are able to derive a comprehensive picture of the electronic structure, separating ground state properties (such as the HOMO-LUMO separation) from excited state properties (such as the C 1s core-exciton binding energy of C(60)). In particular, our approach allows us to determine the difference between core- and valence exciton binding energies in C(60) [0.5 (±0.2) eV]. Furthermore, the RIXS map gives detailed insight into the symmetries of the intermediate and final states of the RIXS process. 相似文献
5.
F. Reinert P. Steiner R. Zimmermann R. Claessen S. Hüfner 《Zeitschrift für Physik B Condensed Matter》1995,99(1):229-234
The valence band of potassium permanganate (KMnO4) was investigated by means of resonant photoemission spectroscopy (ResPES) at the Mn2p, Mn3p and O1s edge. These data confirm
the previous conclusions of a strong deviation from a purely ionic charge distribution in this compound. The ResPES data are
in agreement with previous results about the character of the individual valence band states. A simple cluster model is used
to explain qualitatively the different structures seen in the valence band spectra and their dependence on the photon energy. 相似文献
6.
Dr. K. E. Reinert 《Colloid and polymer science》1968,228(1-2):66-76
Zusammenfassung Ein allgemeiner Zusammenhang zwischen Sedimentationskonstanten verteilung und Diffusionskonstantenverteilung wird angegeben. Darauf aufbauend werden für polydisperse Proben linearer Makromoleküle Beziehungen zwischen den verschiedenen Mittelwerten der Diffusionskonstante abgeleitet. Analoge Zusammenhänge werden angegeben zwischen verschiedenen mittleren Molekulargewichten
nach derSvedberg-Gleichung einerseits und dem GewichtsmittelM
w
oder dem MolekulargewichtM
+ einer monodispersen Subfraktion mit der vorgegebenen Sedimentationskonstantes
0=s
0+ andererseits.Die Ergebnisse sind für eine beliebige Form der Verteilung formuliert. Sie sind dargestellt als Funktion des Gestaltsparameters
und der MomenteI
(v)
der reduzierten Sedimentationskonstantenverteilung. Letztere sind leicht bestimmbar im Falle sehr hochmolekularer Proben und sehr empfindlicher Nachweismethoden. Bei Benutzung einer speziellen einparametrigen Näherung für die reduzierten Sedimentationskonstantenverteilung ist oft eine einfache Abschätzung des Polydispersitätseinflusses möglich.Weiterhin wird eine Möglichkeit für die Berechnung des Einflusses von Gestaltsänderungen auf das Verhältnis o. g. Mittelwerte angegeben. In Umkehrung des Verfahrens ist man in der Lage, die mit Konformationsänderungen verbundenen Veränderungen des Parametersa
s
durch Messung der Änderung der reduzierten Sedimentationskonstantenverteilung einer Probe anzugeben.
Mit 5 Abbildungen und 3 Tabellen
Mitteilung über Polydispersität und Konformation. 相似文献
Summary A general relation between sedimentation constant distribution and diffusion constant distribution is presented. Based on it equations combining different mean values of diffusion constant are derived for polydisperse samples of linear macromolecules. Analogous relations are formulated between different average molecular weights according to theSvedberg equation on the one hand and the weight averageM w or the molecular weightM + of the monodisperse subfraction with an arbitrary sedimentation constants 0=s 0+ on the other hand.The results are formulated for an arbitrary form of the distribution. They are expressed in terms of the shape parameter and the momentsI (v) of the reduced sedimentation constant distribution which may be easily determined in the case of very high molecular weight samples and very sensitive detection methods. By use of a special single parameter approximation for the reduced sedimentation constant distribution a simple estimation of the polydispersity effect may often be possible.Furthermore a possibility is demonstrated for the calculation of the influence of changes in shape on the ratio of given mean values. Converting the procedure we are able to calculate the variation of the parametera s accompanying a conformational change by measuring the change of the reduced sedimentation constant distribution.
Mit 5 Abbildungen und 3 Tabellen
Mitteilung über Polydispersität und Konformation. 相似文献
7.
8.
Let n be an integer and A0,..., Ak random subsets of {1,..., n} of fixed sizes a0,..., ak, respectively chosen independently and uniformly. We provide an explicit and easily computable total variation bound between
the distance from the random variable
, the size of the intersection of the random sets, to a Poisson random variable Z with intensity λ = EW. In particular, the bound tends to zero when λ converges and
for all j = 0,..., k, showing that W has an asymptotic Poisson distribution in this regime.
Received February 24, 2005 相似文献
9.
10.
Two new chemosensor dyes with either one or two trifluoroacetophenone recognition moieties have been investigated in terms of reversibly interacting with amines and diamines. 相似文献