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1.
P. V. Klevtsov L. A. Glinskaya R. F. Klevtsova K. S. Aleksandrov 《Journal of Structural Chemistry》1997,38(4):615-619
Single crystals of CsNaMoO4 · 2H2O were synthesized, and the crystal structure of this compound was determined from X- ray diffraction data (SYNTEX P21 automatic diffractometer, MoKα radiation, 2252 reflections, R =0.037). Crystals are orthorhombic, space group P212121 with unit cell dimensions a =6.379(1), b =8.625(1), c =13.671(2) å, Z =4. The structure of the binary molybdate consists of continuous columns of face- sharing Na octahedra with attached MoO4 tetrahedra. The neighboring columns are linked by the Cs cations and the hydrogen bonds of the water molecules entering into the coordination polyhedra of the Na and Cs atoms. 相似文献
2.
3.
D. P. Klevtsov V. A. Logvinenko B. P. Zolotovskii O. P. Krivoruchko R. A. Buyanov 《Journal of Thermal Analysis and Calorimetry》1988,33(2):531-535
For the mechanochemical activation of two processes can be considered: the structural disordering of laminar crystals, and the formation of molecular dense aggregates from small particles. The activation energy of the dehydration is shown to decrease if the first process predominates, and vice versa. Therefore, to study and compare the kinetics of dehydration of different kaolinites the whole complex of properties the initial samples should be taken into account: the structure defectness, the particle size, particle-packing into aggregates, and the size and density of the aggregates.
Zusammenfassung Bei der mechanochemischen Aktivierung von Kaolinit sind zwei Prozesse zu betrachten: Die strukturelle Unordnung laminarer Kristalle und die Bildung molekular dichter Aggregate aus kleineren Teilchen. Es wird gezeigt, dass die Aktivierungsenergie der Entwässerung abnimmt, wenn der erste Prozess vorherrscht, und zunimmt, wenn der zweite Prozess überwiegt. Deshalb muss bei vergleichenden Untersuchungen zur Entwässerung verschiedener Kaolinite der Gesamtkomplex der Eigenschaften der Ausgangsproben berücksichtigt werden, also die strukturelle Perfektion, Teilchengrösse, Vereinigung von Teilchen zu Aggregaten sowie Grösse und Dichte der Aggregate.
: o . , , , . . , : , , , .相似文献
4.
A.A. Yukhimchuk V.A. Apasov Yu.I. Vinogradov A.N. Golubkov E.V. Gornostaev S.K. Grishechkin L.V. Drakin N.A. Zagoruiko V.N. Istratov P.D. Ishkov A.A. Kononenko G.I. Karyakin V.G. Klevtsov V.A. Klisch V.N. Lobanov A.P. Maksimenko S.S. Matveev A.E. Nikitin V.I. Pustovoy I.I. Sukhoi V.M. Solyankin B.N. Tenyaev V.M. Kharitonov 《Hyperfine Interactions》1999,119(1-4):341-344
A facility is described that allows safe handling of high tritium gas activity as dozens kilocuries in a regular laboratory
environment. It is used to make and deliver into the target a mixture of specific isotopic composition with the contamination
requirement of 10-7 v.f. for Z>1 elements, and recover it upon completion of operation. With this facility, efforts have been accomplished to investigate
into the muon catalyzed fusion on two targets – liquid tritium and high-pressure tritium types. Also, the operation range
was 0.1–120 MPa for pressure and 20–800 K for temperature and the amount of tritium used was about 100 kCi. The facility showed
reliability in operation without indications of radiation beyond the safety level.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
5.
S. F. Solodovinkov Z. A. Solodovnikova R. F. Klevtsova L. A. Glinskaya P. V. Klevtsov E. S. Zolotova 《Journal of Structural Chemistry》1994,35(6):871-878
The binary molybdate of variable composition Li2?2nMn2+x(MoO4)3 (O2Fe2(MoO4)3, was discovered in the Li2MoO4-MnMoO4 system. We have grown single crystals of Li1.60Mn2.20(MoO4)3) and determined its crystal structure (space group Pnma, a=5.145, b=10.681, c=17.985 Å, Z=4). Along with statistical arrangement of Li and Mn in three different atomic positions, cation vacancies in one of these were found. Based on the data obtained, we propose to revise the compositions of some lithium-containing phases with the Li2Fe2(MoO4)3-type structure. 相似文献
6.
R. F. Klevtsova B. G. Bazarov L. A. Glinskaya S. T. Bazarova K. N. Fedorov P. V. Klevtsov Zh. G. Bazarova 《Journal of Structural Chemistry》2002,43(6):939-943
Single crystals of K5(Cd0.5Zr1.5)2(MoO4)6 molybdate have been grown. Its composition and crystal structure have been established from Xray diffraction data CAD4 automatic diffractometer, MoK
radiation, 940 F(hkl), R = 0.0234. The crystals have a trigonal unit cell a = b = 10.624(1), c = 37.694(6), V = 3684.5(8)3, and space group R3c. The 3D mixed framework of the molybdate structure is formed by two kinds of Mo tetrahedra and (Cd, Zr) octahedra joined by shared O vertices. The large cavities in the framework are occupied by K atoms of three kinds. The distribution of Cd2+ and Zr4+ cations over two crystallographic positions has been refined. 相似文献
7.
Binary molybdates K4M2+(MoO4)3 (M2+=Mg, Mn, Co) and crystal structure of K4Mn(MoO4)3 总被引:1,自引:0,他引:1
S. F. Solodovnikov P. V. Klevtsov Z. A. Solodovnikova L. A. Glinskaya R. F. Klevtsova 《Journal of Structural Chemistry》1998,39(2):230-237
Binary molybdates K4M2+ (MoO4)3 (M2+=Mg, Mn, Co) isostructural to triclinic \ga-K4Zn(WO4)3 were synthesized, and optimal conditions for their spontaneous crystallization were found. It was established by XRPA and DTA that at 530°C the structure of the compound with cobalt undergoes a transition to the orthorhombic structure of K4Zn(MoO4)3. The structure of K4Mn(MoO4)3 was determined from single crystal diffraction data (a=7.613, b=9.955, c=10.156 Å,α=92.28,β=106.66,γ=105.58°, Z=2, space group $P\bar 1$ , R=0.030). In this compound, Mn has a higher coordination number (CN=5+1) than that of Zn inα-K4Zn(WO4)3 (CN=4+1). The main structural feature is pairs of MnO6 octahedra linked by the bridging MoO4 tetrahedra into ribbons stretching along the a axis. The structure is compared with related structures of binary molybdates and other members of the alluaudite family. 相似文献
8.
R. F. Klevtsova Zh. G. Bazarova L. A. Glinskaya V. I. Alekseev S. I. Arkhincheeva B. G. Bazarov P. V. Klevtsov K. N. Fedorov 《Journal of Structural Chemistry》1994,35(3):286-290
Three (5∶1∶3, 1∶1∶1, and 2∶1∶6) ternary phases were discovered in the K2MoO4?AMoO4?Zr(MoO4)2 system, where A is Mg or Mn. For A=Mg, we have synthesized 5∶1∶3 single crystals and determined their crystal structure from X-ray diffraction data (a CAD-4 automatic diffractometer, MoKα radiation, 1166 F(hkl), and R=0.026). The compound crystallizes in the trigonal system with space group R3c, a=10.576(1), c=37.511(3), Å, Z=6, dcalc=3.576, and dmsd=3.54 g/cm3. The structure is a three-dimensional composite framework of alternating Mo tetrahedra and (Mg, Zr) octahedra, which are linked via the common O vertices. Potassium atoms of three kinds are located in large framework cavities. Their polyhedra (ten-vertex polyhedra and a cubeoctahedron) are linked together by common faces and edges to form infinite zigzag columns of a large section. When solving the structure, we refined the composition of the crystals and the distribution of Mg2+ and Zr4+ cations in the M(1) and M(2) positions resulting in the formula above. 相似文献
9.
We rederive the expansion of the Bergman kernel on Kähler manifolds developed by Tian, Yau, Zelditch, Lu and Catlin, using path integral and perturbation theory, and generalize it to supersymmetric quantum mechanics. One physics interpretation of this result is as an expansion of the projector of wave functions on the lowest Landau level, in the special case that the magnetic field is proportional to the Kähler form. This is relevant for the quantum Hall effect in curved space, and for its higher dimensional generalizations. Other applications include the theory of coherent states, the study of balanced metrics, noncommutative field theory, and a conjecture on metrics in black hole backgrounds discussed in [24]. We give a short overview of these various topics. From a conceptual point of view, this expansion is noteworthy as it is a geometric expansion, somewhat similar to the DeWitt-Seeley-Gilkey et al short time expansion for the heat kernel, but in this case describing the long time limit, without depending on supersymmetry. 相似文献
10.
NL Asfandiarov AI Fokin VG Lukin EP Nafikova GS Lomakin VS Fal'ko YV Chizhov 《Rapid communications in mass spectrometry : RCM》1999,13(12):1116-1123
A series of anthraquinone (C(14)O(2)H(8)) derivatives has been studied by means of electron capture negative ion mass spectrometry (ECNI-MS), photoelectron spectroscopy (PES), and AM1 quantum chemical calculations. Mean lifetimes of molecular negative ions M(-.) (MNI) have been measured. The mechanism of long-lived MNI formation in the epithermal energy region of incident electrons has been investigated. A simple model of a molecule (a spherical potential well with the repulsive centrifugal term) has been applied for the analysis of the energy dependence of cross sections at the first stage of the electron capture process. It has been shown that a temporary resonance of MNI at the energy approximately 0.5 eV corresponds to a shape resonance with lifetime 1-2.10(-13) s in the f-partial wave (l = 3) of the incident electron. The next resonant state of MNI at the energy approximately 1.7 eV has been associated with the electron excited Feshbach resonance (whose parent state is a triplet npi* transition). In all cases the initial electron state of the MNI relaxes into the ground state by means of a radiationless transition, and the final state of the MNI is a nuclear excited resonance with a lifetime measurable on the mass spectrometry timescale. Copyright 1999 John Wiley & Sons, Ltd. 相似文献