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1.
A cheap synthesis of the so‐called ‘decalin‐1,8‐diones’ started with the conjugate (1,4‐) addition of cyclohex‐2‐en‐1‐one derivatives to the γ‐position of the dilithium derivative (buta‐1,3‐diene‐1,1‐bis(olate)) of crotonic acid. Hydrogenation of these ‘1,4‐γ’ adducts and final cyclization afforded the enol tautomers of decalin‐1,8‐diones. Nucleophilic substitutions at these 3‐oxoenols by NH3 or primary amines created only monoamino products (namely, 3‐oxoenamines) whose reactions with OPCl3 yielded dihydro(1,3,2)oxazaphosphinin‐2‐one derivatives. The two regioisomers of a trimethyl‐3‐oxoenamine served as models for the constitutional assignments of the two rapidly interconverting (hence, individually NMR‐invisible), tautomeric trimethyl‐3‐oxoenols. Such methyl substitutions served to break the ‘pretended’ symmetry of ‘decalin‐1,8‐dione’. Hydrazine and 3‐oxoenols furnished oxygen‐free indazole derivatives whose N?H bonds exchanged with t1/2=ca. 0.00035 s at ca. ?58(9) °C. 相似文献
2.
Stage-I fatigue cracks are commonly described by the model of Bilby, Cottrell and Swinden (BCS model). However, since several experimental investigations have shown a dislocation-free zone (DFZ) in front of crack-tips, it is necessary to validate the new DFZ model and to examine the deviations to the BCS model. Therefore, the dislocation density distribution is derived from height profiles of slip lines in front of stage-I fatigue cracks in CMSX4® single crystals measured by contact-mode atomic force microscopy. This is possible, because the cracks are initiated at notches milled by focused ion beam technique directly on slip planes with a high Schmid factor. Consequently, the directions of the Burgers vectors are well known; it is possible to calculate the dislocation density distributions from the height profiles. The measured distributions are compared to the calculated distribution function of the DFZ model proposed by Chang et al. The additionally measured microscopic friction stress of the dislocations is then used to calculate the influence of grain boundaries on the dislocation density distribution in front of stage-I cracks. The calculation is done by the extended DFZ model of Shiue et al. and compared with the measured distribution function in polycrystalline specimens. Finally, the crack-tip sliding displacement as a measure for the crack propagation rate is compared for the DFZ model and the BCS model with the experimentally revealed values. The important result: the often used BCS model does not reflect the experimental measurements. On the contrary, the DFZ model reflects the measurements at stage-I cracks qualitatively and quantitatively. 相似文献
3.
T. Hannappel S. Visbeck K. Knorr J. Mahrt M. Zorn F. Willig 《Applied Physics A: Materials Science & Processing》1999,69(4):427-431
For the first time direct contamination-free transfer to UHV was achieved for the P-rich InP(100) surface that is the easiest
to prepare and control in the MOCVD environment. To avoid contamination during transfer a commercial MOCVD apparatus was modified
to allow for transfer of samples to the 10-9 mbar UHV range within a very short time (less than 20 s) [1]. Epitaxial InP(100) films were prepared with TBP (tertiarybutylphosphine)
and TMIn (trimethylindium) as precursors. In situ reflectance anisotropy spectroscopy (RAS) was carried out in the MOCVD environment.
After transfer of the sample to UHV the same RAS spectrum was recovered. Auger-electron spectra (AES) confirmed the P-termination
of the surface reconstructions suggested by RAS.
Received: 19 October 1998 / Accepted: 21 April 1999 / Published online: 14 July 1999 相似文献
4.
E. R. Flint W. H. Beal Aug E. Knorr F. Fuchs und Thomas C. van Nuys 《Fresenius' Journal of Analytical Chemistry》1890,29(1):66-68
Ohne Zusammenfassung 相似文献
5.
G. Lunge A. Zeckendorf H. Wolpert H. Trautzsch J. Rosenthal O. Schulz W. Ohlmüller M. Müller J. B. Cohen G. Appleyard Fl Kratschmer E. Wiener Henriet W. Fossek M. Teich F. Clowes N. P. Schierbeck E. Cramer A. v. Bibra G. Defren Renk Hilger E. v. Raumer G. Gaglio Merget J. Uffelmann L. A. Nekam J. Archarow Kijanicin L. Eisenlohr Cl Fermi C. Arens H. Wegmann E. Knorr J. König und A. Bömer 《Fresenius' Journal of Analytical Chemistry》1897,36(1):329-340
Ohne Zusammenfassung 相似文献
6.
L. Knorr H. Schubert und W. Wislicenus 《Fresenius' Journal of Analytical Chemistry》1913,52(3-4):234-235
Ohne Zusammenfassung 相似文献
7.
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9.
L. Knorr und A. Hörlein 《Fresenius' Journal of Analytical Chemistry》1909,48(7-8):486
Ohne Zusammenfassung 相似文献
10.