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排序方式: 共有175条查询结果,搜索用时 125 毫秒
1.
F. Seiffert R. Schwengner G. Winter L. Funke W. Lieberz R. Reinhardt K. P. Schmittgen D. Weil R. Wrzal K. O. Zell P. von Brentano 《Zeitschrift für Physik A Hadrons and Nuclei》1991,340(2):141-153
Excited states of73Se have been investigated up to spin, 21/2 using techniques of in-beamγ-ray spectroscopy in connection with the70Ge(α, n) reaction. Mean lifetimes of 12 levels have been determined applying Doppler-shift andγ-RF-methods. Five different bands have been identified that reflect a variety of different excitation modes. The decoupled 9/2+ band is likely to correspond to an oblate deformation while the 5/2+ band is interpreted as a strongly coupled prolate band built on the Nilsson configuration [422] 5/2+. The 3/2? band is a strongly coupled band built on the [301] 3/2} configuration.Nuclear reactions:70Ge(α,n),E=14, 16, 18, 19, 20MeV; measuredE γ,I γ,σ(E γ,θ),γγ-coin, linear polarization, DSA,γ(t).75Se deduced levels,I, π, τ, δ(E2/M1), B(σλ). Enriched targets, Ge detectors. 相似文献
2.
H. Prade J. Döring W. Enghardt L. Funke L. Käubler 《Zeitschrift für Physik A Hadrons and Nuclei》1987,328(4):501-502
An (α, 2nγ) in-beam study of excited states in 142Nd revealed 27 new levels on top of the 6+ isomer. Nanosecond lifetimes were found for two levels. The measured excitation energies were compared with spherical shell-model predictions obtained from suitably truncated model spaces. 相似文献
3.
R. G. Gamper P. T. Funke A. A. Volpe 《Journal of polymer science. Part A, Polymer chemistry》1971,9(8):2137-2146
A series of ferrocene-containing polymeric azines and polymeric Schiff bases have been synthesized by means of acid-catalyzed solution polycondensations. The molecular structures of the polymers synthesized have been determined, and information concerning their thermal behavior has been obtained. Comparative thermal stabilities of the products of polymerization of aliphatic and aromatic diamines with 1,1′-diformylferrocene and 1,1′-diacetylferrocene were investigated by thermogravimetric analysis both in air and in an inert atmosphere. In the inert atmosphere, initial weight loss due to thermal stress did not occur below 300°C in all cases, and in many cases 50–70% residue of polymer sample remained at 700°C. The use of a fluorinated diamine led to the synthesis of a polymer which did not exhibit any significant enhancement of thermal properties. Investigation of the polymer products by direct inlet mass spectroscopy led to the observation that several of the systems contained significant amounts of cyclic dimers, although linear polymers were the major products in most cases. Extraction of the cyclic dimers followed by molecular weight determination by vapor phase osmometry confirmed their molecular structures. 相似文献
4.
G. Schnitt und A. Funke 《Fresenius' Journal of Analytical Chemistry》1967,230(5):338-344
Zusammenfassung Die Methode von Bonsels u. Linnemann [1] zur Bestimmung von FeII und MnIII lieferte bei der Überprüfung falsche Ergebnisse. Die Ursache liegt darin, daß sich der Blindwert des Azides in Gegenwart von Mn2ü-Ionen erheblich erhöht und in der Siedehitze eine Reaktion zwischen MnIII und CrIII abläuft. Da eine Auflösung selbst fein pulverisierter Ferrite in dem mitgeteilten Lösungsgemisch nur in der Siedehitze erfolgt, ist eine Bestimmung von FeII und MnIII in Ferriten nach dieser Methode nicht möglich.
Herrn Dr. P. Kleinert vom Institut für Magnetische Werkstoffe danken wir an dieser Stelle für wertvolle Diskussionsbeiträge und das bei der Durchführung der Arbeit gezeigte Interesse. 相似文献
Summary The method for the determination of FeII and MnIII in manganese ferrites by Bonsels and Linnemann [1] was examined. It was found that the consumption of NaN3, used for the reduction of MnIII and effecting in a second (not wanted) reaction the reduction of Cr2O7 2–, is essentially increased by the presence of MnII and causes an error in the determination of FeII. The second error is the reaction between MnIII and CrIII at boiling temperature. On account of the necessity to dissolve the ferrites with the acid mixture at boiling temperature the determination of MnIII and FeII is not possible.
Herrn Dr. P. Kleinert vom Institut für Magnetische Werkstoffe danken wir an dieser Stelle für wertvolle Diskussionsbeiträge und das bei der Durchführung der Arbeit gezeigte Interesse. 相似文献
5.
6.
7.
A. Funke und P. Kleinert 《Fresenius' Journal of Analytical Chemistry》1971,255(5):353-357
Zusammenfassung Zur Bestimmung von Fluoridverbindungen des Types Me(I)Me(II)F3 werden Analysenmethoden beschrieben, die mit Hilfe von Eichsubstanzen überprüft und korrigiert werden. Rubidium wird mit Natriumtetraphenylborat gefällt. Eisen wird cerimetrisch, Nickel und Kobalt werden komplexometrisch bzw. photometrisch und Fluor wird nach Abtrennung als Fluorokieselsäure mit Silberoxid bestimmt. — Der relative Fehler liegt bei der photometrischen Kobaltbestimmung bei etwa 5%, bei allen anderen Analysenmethoden unter 1%.
IV. Mitteilung: diese Z. 250, 253 (1970). 相似文献
Analytical investigations of magnetic materialsV. Complete analysis of metal fluoride compounds of the type Me(I)Me(II)F3
The methods are examined and corrected with standard substances. Rubidium is determined with sodium tetraphenyloboron, while the iron, nickel and cobalt contents are titrated cerimetrically or complexometrically or measured photometrically, respectively. Fluorine is separated as fluorosilicic acid and determined with silver oxide. The relative errors are for the photometric cobalt analysis about 5%, or the other methods up to 1%.
IV. Mitteilung: diese Z. 250, 253 (1970). 相似文献
8.
L. G. Kostova W. Andrejtscheff L. K. Kostov L. Funke E. Will A. I. Vdovin 《Zeitschrift für Physik A Hadrons and Nuclei》1992,342(2):145-148
Using the (,n) reaction, the half-life of the first 11/2– level in97Mo has been determined as T1/2(1437.0 keV)=2.5±0.3 ns by means of the pulsed beam method. The experimentally obtainedB(M2) value between theh
11/2 andg
7/2 configurations in97Mo has been satisfactorily described within the quasiparticle-phonon model usingg
s
eff
=0.6g
s
free
. Similar calculations and comparisons with experminental data have been performed also for95,99Mo as well as for99Ru and101Pd.This work is partly supported by the Bulgarian National Research Foundation 相似文献
9.
J. Döring L. Funke W. Wagner G. Winter 《Zeitschrift für Physik A Hadrons and Nuclei》1991,339(3):425-426
Excited states in the doubly-odd nucleus82Rb have been investigated via the reactions79Br(,n) and78Se(7Li,3n) using in-beam-ray spectroscopy. The level energy of the longlived 5– isomer has been determined to 68.3 keV which is below the energy of the 2– state found at 88.9 keV with a lifetime of=2.4(2) ns. A sequence of positive-parity states beginning with a 6+ level at 191.3 keV (=20(3) ns) and extending to a (10+) level has been interpreted to contain the two-particle configuration (g
9/2
9/2) and collective excitations. 相似文献
10.
K. Funke R. D. Banhatti D. Laughman M. Mutke M. D. Ingram 《The European physical journal. Special topics》2008,161(1):65-78
Complementary ways for studying the motion of mobile ions
in materials with disordered structures are obtained by varying
pressure, tempe- rature and frequency. New results are presented based
on a combination of experimental work and modelling. Pressure-dependent measurements on alkali borate glasses show there
is a remarkable difference between the activation volumes for
conduction and diffusion, with ΔVσ< ΔVD,
implying that the Haven ratio decreases with increasing pressure. We
propose a mechanism that is characterised by a directionally
positive correlation between successive hops of different ions into
a moving vacant site. The effect of increasing pressure is to
increase the degree of directional correlation and thus to make the
conduction pathways increasingly linear in aspect. In sodium
borate glasses with much lower sodium content, a maximum has been
observed when ionic conductivity is plotted versus temperature at
fixed frequency. This feature is identified as being of the nearly
constant loss (NCL) type, caused by localised flip-flop movements of
interacting charges in the B2O3 network. In crystalline
γ-RbAg4I5, a related localised effect has also been
found, in this case caused by activated hops of silver ions confined
within structural “pockets”. Finally, the frequency dependence
of the ionic conductivity is reviewed in fragile ionic melts.
Fragility is interpreted here as a consequence of the shape of the
local ionic potentials, which unlike in glass do not reflect the
pre-existence of empty cation sites for successive ions to hop into.
This difference in short-range, short-time behaviour leads directly
to the emergence of non-Arrhenius dc conductivity and fluidity
behaviours in molten salts. We are thus able to establish a
common phenomenological and theoretical approach to ion transport in
a wide range of systems, largely based on broadband conductivity
spectroscopy. 相似文献