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81.
82.
83.
E. V. Brakhman G. V. Danilyan A. V. Fedorov I. L. Karpikhin V. A. Krakhotin V. S. Pavlov R. Golub E. I. Korobkina T. Wilpert 《JETP Letters》2004,80(11):675-677
The preliminary result of the P-odd asymmetry of prompt neutron emission in 235U fission induced by polarized cold neutrons is a=(2.7±0.8)×10?5. Only scission neutrons can show such asymmetry, whereas neutrons emitted by excited fragments are the unavoidable background, which suppress the sought asymmetry. The P-odd asymmetry of light fragment emission for 235U is equal to (8.4±0.6)×10?5. Assuming that the last figure defines the parity mixture of the fissile nucleus, then the suppression factor is equal approximately to 3. 相似文献
84.
Aptamer-functionalized Au nanoparticles for the amplified optical detection of thrombin 总被引:7,自引:0,他引:7
Pavlov V Xiao Y Shlyahovsky B Willner I 《Journal of the American Chemical Society》2004,126(38):11768-11769
The catalytic enlargement of aptamer-functionalized Au nanoparticles amplifies the optical detection of aptamer-thrombin complexes in solution and on surfaces. 相似文献
85.
L. M. Mosulishvili M. V. Frontasyeva S. S. Pavlov A. I. Belokobylsky E. I. Kirkesali A. I. Khizanishvili 《Journal of Radioanalytical and Nuclear Chemistry》2004,259(1):41-45
Epithermal neutron activation analysis (ENAA) was used for study the biomass of Spirulina platensis. The background levels of concentration 27 macro-, micro- and trace elements ranging from 10-3 to 104 ppm was determined. It was found that the biomass of Spirulina does not contain toxic element concentrations above the tolerance level and can be utilized as a matrix of pharmaceuticals. The conentrations of basic elements in C-phycocianin and DNA extracted from Spirulina platensis were determined by ENAA. A comparison of the element content of a whole Spirulina biomass with that of a refined C-phycocianin preparation was made. 相似文献
86.
R.Kh. Zhukavin D.M. Gaponova A.V. Muravjov E.E. Orlova V.N. Shastin S.G. Pavlov H.-W. Hübers J.N. Hovenier T.O. Klaassen H. Riemann A.F.G. van der Meer 《Applied physics. B, Lasers and optics》2003,76(5):613-616
Terahertz stimulated emission of phosphorus donors in silicon optically excited by radiation from the free-electron laser
FELIX has been studied. It is found that a spectral line of the Si:P laser emission depends on pump frequency. Stimulated
emission arises on the 2p0→1s(E) intra-centre transition (21.2 meV) under resonant pumping of the 2p0 state and on the 2p0→1s(T2) transition (22.3 meV) under pumping of the 2p± or higher odd-parity donor states. The line shift is attributed to the Auger redistribution of the 1s(E)- and 1s(T2)-state populations.
Received: 7 November 2002 / Revised version: 7 April 2003 / Published online: 14 May 2003
RID="*"
ID="*"Corresponding author. Fax: +49-30/6705-55-07, E-mail: sergeij.pavlov@dlr.de
RID="**"
ID="**"On leave from: The Institute for Physics of Microstructures, Nizhny Novgorod, Russia 相似文献
87.
Pavlov A. E. Sokolov V. M. Zakharov V. I. 《Russian Journal of General Chemistry》2001,71(11):1811-1814
A series of acetylated aryl -D-glucopyranosides were prepared in 12-63% yields from tetra-O- acetyl--D-glycopyranosyl bromide and phenols containing acyl, formyl, and hydroxy substituents, and also from sterically hindered phenols in the two-phase system chloroform-aqueous alkali in the presence of triethylbenzylammonium chloride. Hydroxyethylated sucrose and dibenzo-18-crown-6 do not behave as phasetransfer catalysts in glycosylation of phenols. 相似文献
88.
A. A. Pavlov 《Acta Appl Math》2001,68(1-3):137-157
We define N-theory as being an analogue of K-theory on the category of von Neumann algebras such that K
0(A)N
0(A) for any von Neumann algebra A. Moreover, it turns out to be possible to construct the extension of the Chern character to some homomorphism from N
0(A) to an even Banach cyclic homology of A. Also, we define generalized Lefschetz numbers for an arbitrary unitary endomorphism U of an A-elliptic complex. We study them in the situation when U is an element of a representation of some compact Lie group. 相似文献
89.
A. I. Pavlov 《Mathematical Notes》2000,68(3):370-377
The main result of this paper is the following theorem. Suppose thatτ(n) = ∑
d|n
l and the arithmetical functionF satisfies the following conditions:
Then there exist constantsA
1,A
2, andA
3 such that for any fixed \g3\s>0 the following relation holds:
. Moreover, if for any primep the inequality \vbf(p)\vb\s<1 holds and the functionF is strongly multiplicative, thenA
1\s>0.
Translated fromMatematicheskie Zametki, Vol. 68, No. 3, pp. 429–438, September, 2000. 相似文献
1) | the functionF is multiplicative; |
2) | ifF(n) = ∑ d|n f(d), then there exists an α>0 such that the relationf(n)=O(n −α) holds asn→∞. |
90.
Fiebig M Frohlich D Kohn K Leute S Lottermoser T Pavlov VV Pisarev RV 《Physical review letters》2000,84(24):5620-5623
Optical second harmonic spectroscopy is introduced as a powerful supplement for the determination of complex magnetic structures. Experimental efforts are simplified and new degrees of freedom are opened. Thereby, some principal or technical restrictions of neutron or magnetic x-ray diffraction experiments are overcome. High spatial resolution leads to additional information about magnetically ordered matter. As an example, the noncollinear magnetic structure of the hexagonal manganites RMnO3 ( R = Sc, Y, Ho, Er, Tm, Yb, Lu) is analyzed. The results show that some earlier conclusions on their magnetic symmetry and properties should be revised. 相似文献