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We consider a new model for passive mode locking in a semiconductor laser comprising a set of delay differential equations. Bifurcations leading to the appearance and break-up of the mode-locking regime are studied numerically. 相似文献
3.
Mechanism of the radiolytic transformations of cellulose 1. Formation and transformation of radicals
The formation (77K) and transformation (300K) of radicals in celluloses with various degrees of crystallinity under -radiation have been studied by the ESR method. The radical products of the low-temperature -radiolysis of cellulose formed in the polymer chain are macroradicals the unshared electrons of which are localized on C(1) C(4), O(O), and C(5). With a rise in the temperature to 300K they undergo substantial changes, which shows the dominating role of secondary reactions of macroradicals in the radiation-chemical transformation of cellulose.A. S. Sadykov Institute of Organic Chemistry, Academy of Sciences of the Republic of Uzbekistan, Tashkent, fax (3712) 62 70 71. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 587–595, July–August, 1996. Original article submitted February 26, 1996. 相似文献
4.
D. Yu. Turaev 《Russian Journal of Applied Chemistry》2005,78(10):1615-1619
A chemical power cell is suggested, in which the positive and negative electrodes are placed each in its own electrolyte. This makes it possible to obtain the highest absolute value of the electrode potential of each electrode. The electromotive force and the maximum theoretical specific energy are calculated for an acid-alkaline-salt battery of the zinc-dioxide-lead system. 相似文献
5.
We review results on local bifurcations of codimension 1 in reversible systems (flows and diffeomorphisms) which lead to the birth of attractor-repeller pairs from symmetric equilibria (for flows) or periodic points (for diffeomorphisms). 相似文献
6.
D. Yu. Turaev 《Russian Journal of Applied Chemistry》2018,91(7):1112-1117
Zinc-bromine alkali-salt membrane-type chemical power cell was assembled and studied. The open-circuit voltage (OCV) of the zinc-bromine alkali-salt membrane chemical power cell (CPC) was experimentally obtained (2.30 V). This value is close to the theoretically calculated value of the electromotive force (EMF) of the cell (2.27 V) and exceeds the EMF and OCV of many known power cells using a single homogeneous-composition aqueous electrolyte and having no ion-exchange membrane. The maximum theoretical specific energy of the zinc-bromine alkali-salt membrane CPC is 317.3 W h kg–1, which is lower that the corresponding values for the zinc-silver and zinc-nickel power cells and exceeds that of nickel-iron, nickel-cadmium, and lead sulfuric acid CPCs. It is shown that the cell under study can be used as an electric battery. 相似文献
7.
Estimation of ion movement close to atomic chains taking into account the elastic and inelastic energy losses and vacancy type imperfections was performed on the basis of a model of binary interactions of ions with the atoms of a crystal. An analysis of results shows that at scattering by atomic chains a phenomenon which makes a substantial contribution to scattering by the single crystal surface the inelastic energy losses exceed the single scattering ones by a factor of 5–6. 相似文献
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Haewon Song Dino Wu Dimitry Mazunin Sizhou M. Liu Yoshikatsu Sato Nicolas Broguiere Marcy Zenobi-Wong Jeffrey W. Bode 《Helvetica chimica acta》2020,103(11):e2000172
Chemical ligation reactions of functional groups that can be masked with two-photon labile protecting groups provide a powerful technology for the three-dimensional patterning of molecules – including proteins – onto hydrogel scaffolds. In order to utilize readily prepared hydrogels constructed by the potassium acyltrifluoroborate (KAT)-hydroxylamine amide formation ligation for two-photon patterning, we have developed a unique post-polymerization protecting group strategy through the reaction of KATs and dithiols in water and deprotection by two-photon excitation. After precise 3D spatially confined light irradiation, the unprotected KATs undergo ligations with hydroxylamine-functionalized superfolder GFP and sulforhodamine B for the composition of three-dimensional patterns. 相似文献
10.
O. D. Turaev L. I. Mar'yash V. K. Burichenko V. A. Shibev 《Chemistry of Natural Compounds》1981,16(4):394-397
A number of peptide fragments forming analogs of section 33–40 of histone H1, including the phosphorylatable serine-37 residue have been synthesized by the carbodiimide and modified azide methods. The specific introduction of trifluoroacetyl labels at the free -amino groups of the peptides has been effected under conditions in which the other side chains were blocked by benzyloxycarbonyl (Z) protection. Thioethyl trifluoroacetate was used as the trifluoroacetylating reagent. The Z groups were removed from the final products by the action of HBr in absolute CF3COOH.V. I. Nikitin Institute of Chemistry, Academy of Sciences of the TadzhSSR, Dushanbe. Institute of Molecular Biology, Academy of Sciences of the USSR, Moscow. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 542–546, July–August, 1980. 相似文献