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1.
A. G. Akopyan 《Journal of Applied Mechanics and Technical Physics》1991,32(5):808-813
Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 5, pp. 159–163, September–October, 1991. 相似文献
2.
We analyze bremsstrahlung due to collision of a relativistic electron with an ion in an external longitudinal magnetic field. Within the framework of the perturbation method, a general expression for the electric field of radiation is derived. It is shown that the magnitude of the resonance peak of the spectral line is determined by the small dissipative force of radiation reaction. The influence of the external field on the specific intensity and polarization of the wave is analyzed in detail. 相似文献
3.
Differential absorption spectra of RbAg4I5 have been measured in the exciton absorption region of AgI within the temperature range 27–250 °C. In the same temperature
range, the temperature behavior of the heat capacity of RbAg4I5, Rb2AgI3, and KAg4I5 have been obtained by differential scanning calorimetry. An analysis of the results suggests that, in AgI microcrystals less
than r
cr in size, the upper boundary for stability of the low-temperature β modification is higher by several tens of degrees.
Fiz. Tverd. Tela (St. Petersburg) 40, 852–854 (May 1998) 相似文献
4.
M. L. Eritsyan L. A. Gyurdzhyan L. T. Melkonyan G. V. Akopyan 《Russian Journal of Applied Chemistry》2006,79(10):1666-1668
Composition and rheological characteristics of aqueous solutions of acrylic acid/urea copolymers were studied, including the composition dependences of the equivalent conductivity and viscosity. 相似文献
5.
IR spectra of solutions of LiCIO4 (1), NaCIO4 (2), LiI (3), NaI (4) in binary acetone — acetonitrile solvent were investigated in the region of CN (1–4), CC (1,3) and CH (3,4) stretching vibration bands of acetonitrile and CCC group (1) asymetric stretching vibration band of acetone at the wide range varying of the composition of the binary solvent. Infrared studies were also carried out on solutions of LiCIO4 and NaCIO4 in CH3CNC2H5OH mixtures. The C N (1,2) and CC (1) stretching bands of acetonitrile were measured for 0.7–1.0M of CH3CN. The observed intensities of IR bands allowed to calculate the solvating abilities of used solvents and to estimate the change of solvation sphere composition. 相似文献
6.
N. S. Arutyunyan L. A. Akopyan G. A. Gevorgyan G. M. Snkhchyan G. A. Panosyan 《Chemistry of Heterocyclic Compounds》2005,41(4):437-441
A preparative method was developed for the synthesis of ethyl furfurylidenecyanoacetate. Its condensation with phenylmagnesium bromide gave ethyl α-cyano-β-(2-furyl)hydrocinnamate, the decarboxylation of which led to β-(2-furyl)hydrocinnamonitrile. Reduction of this nitrile with lithium aluminum hydride gave 2-(3-amino-1-phenylpropyl)furan. Some of its transformations were studied.__________Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 517–521, April, 2005. 相似文献
7.
V. E. Proskurina M. N. Akopyan V. A. Myagchenkov 《Russian Journal of Applied Chemistry》2006,79(7):1146-1152
The kinetics of hindered sedimentation and thickening of the sediments of a real disperse system (bentonitic clay suspension) was studied. The flocculation parameters of acrylamide copolymers in aqueous and aqueous salt solutions were evaluated in relation to the chemical nature and concentration of flocculants and electrolytes. 相似文献
8.
The IR spectra were measured and the vibrational problem was solved for the 1,2-dimethyl-3-phenylcyclopropene (I) and 1,2-diphenylcyclopropene (II) molecules. The forms of the normal vibrations were determined, and the vibrations associated with vibrations of the exo- and endocyclic bonds of the ring were distinguished. It was shown that substitution at the double bond of cyclopropene leads to a change in the form of the symmetrical vibration of the ring in comparison with the vibration of unsubstituted cyclopropene. It was shown that a significant hypsochromic shift of the band of the symmetrical ring vibration in 1,2-disubstituted cyclopropenes in comparison with cyclopropenes that do not contain substituents at the C1,2 atoms is due chiefly to the kinematic effect of the substituent. It was found that the introduction of substituents at the double bond of the ring leads to a decrease in the force constant of the double bonds.St. Petersberg University. Translated from Zhurnal Strukturnoi Khimii, Vol. 34, No. 1, pp. 125–132, January–February, 1993. 相似文献
9.
M. E. Akopyan V. I. Kleimenov M. V. Kleimenov A. G. Feofilov 《High Energy Chemistry》2001,35(4):265-269
The stepwise ionization processes of 1,2-dihydroxybenzene vapor at 315–275 and 266 nm were studied by the techniques of mass spectrometry, total ionization current spectroscopy, and zero electron kinetic energy spectroscopy. A two-step ionization process yielding the molecular ion prevails at a laser intensity up to 107W/cm2. As the radiation intensity increases, fragmentation takes place via the dissociation of molecular and fragment ions due to absorption of one additional photon. The formation pathways of principal fragment ions are discussed. 相似文献
10.
G. K. Airapetyan M. G. Akopyan Zh. S. Arustamyan É. A. Markaryan 《Chemistry of Heterocyclic Compounds》1993,29(5):578-581
Methods have been developed for the synthesis of 1,4-benzodioxanyl-6-ethylamine with cyclopentyl and tetrahydropyranyl substituents in the -position. These compounds have been used as starting materials for the synthesis of new heterocyclic systems, the 4-spirocyclosubstituted dioxinoisoquinolines.For Communication 29, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 677–680, May, 1993. 相似文献