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131.
Threshold energies Et are determined for photoelectron emission by 20 inorganic anions in aqueous solution (7.1 < Et < 9.1 eV). Calculated values of Et for Cl?, Br?, I? agree with experiment. The Et are correlated with charge-transf absorption spectra. 相似文献
132.
Summary Al2O3-PLOT columns are used with great advantage for the analysis of volatiles, because of the increased capacity ratio and selectivity compared to WCOT-columns. Their applicability is limited to relatively non-polar components with relatively low boiling points i. e. eluting before n-decane.In the analysis of the halocarbons in stratospheric air, the decomposition of certain compounds was observed. In this study the stability of a number of volatile organic compounds was determined in function dependence of the column temperature using a two-dimensional GC-system.A possible reaction mechanism for the decomposition is proposed and confirmed for several chlorinated ethanes. 相似文献
133.
Monitoring data from chemical analysis of rainwater and aerosol samples collected in an urban area have been interpreted by the use of environmetric approaches. An attempt was done to compare the data set structures of both type of precipitation and to estimate the contribution of different anthropogenic and naturally occurring emission sources to the total mass of the wet and dry precipitation. It was found that three latent factors explaining over 80% of the total variance of the set are responsible for the rainwater set structure-'sea spray', 'soil dust', and 'anthropogenic'. Only two were the latent factors explaining the dominant part of the variance in the case of aerosol samples-'anthropogenic' and 'natural'. It is shown that the anthropogenic influence for aerosol samples is more complex that that of rainwater samples and represents interaction between typical anthropogenic sources and natural emitters. Additionally, a source apportioning using multiple regression on absolute principal component scores is performed in order to obtain qualitative information about the impact of the different identified emission sources on the urban environment. 相似文献
134.
The impact of spilled explosives, their by-products and degradation products on human beings and the environment has been
recognised as a serious problem at areas of existing and former ammunition plants. In nature, aerobic and anaerobic degradation
processes of explosives and their accompanying compounds yield polar contaminants with relatively high water solubilities.
Most are potentially carcinogenic and mutagenic. An HPLC method applying UV-detection for nitroaromatic compounds and amperometric
detection for aminoaromatic and phenolic compounds was used for monitoring the degradation of explosives in a polluted groundwater
sample under natural conditions. Analysis was performed by direct injection of aliquots of the sample after exposition to
daylight for different periods of time.
Presented as a poster at the Anakon ’95 Conference in Schliersee, April 24–26, 1995 相似文献
135.
R.J. Van De Nesse G.Ph. Hoornweg C. Gooijer U.A.Th. Brinkman N.H. Velthorst 《Analytica chimica acta》1989
Laser-induced fluorescence (LIF) detection in conventional-size column liquid chromatography is achieved at 257 nm with a frequency-doubled argon-ion laser. Short-wavelength excitation offers two important advantages: firstly, a wide variety of analytes can be excited, and secondly, the Raman scatter of the eluent does not interfere with the fluorescence of the analytes. A standard mixture of polynuclear aromatic hydrocarbons was studied, both with LIF detection and with a commercially available sensitive conventional fluorescence detector. The improvement in the detection limits ranges from about a factory of 4 to 30; the LIF detection limits are typically at the 50 ng l?1 level, which corresponds to an injected amount of 0.5 pg. 相似文献
136.
Thérèse Dupuis 《Mikrochimica acta》1967,55(3):461-464
Résumé Dans le spectre d'absorption infrarouge de l'iodatochromate de potassium K[(CrO3)(IO3)], on peut identifier la présence de bandes de vibration de valence de ponts Cr-0-I à 508 et680 cm–1.
Summary The infrared absorption spectrum of potassium iodatochromate K(CrO3)(IO3) contains vibration bands of the valence bridges Cr-O-I at 508 and 680 cm–1.
Zusammenfassung Im Infrarot-Absorptionsspektrum des Kaliumjodatochromats lassen sich Banden der Valenzschwingungen der Atomgruppe Or-O-J bei 508 und 680 cm–1 nachweisen.相似文献
137.
M. De Bruin P. Bode H. Th. Wolterbeek 《Journal of Radioanalytical and Nuclear Chemistry》1987,110(2):365-372
Two examples are given to illustrate how modern experimental techniques may extend the scope of possibilities of radiotracer applications. The first example refers to the use of a Ge-detector -ray spectrometer to measure the transport in plants of 15 elements simultaneously. The second example presented is an in-vivo study of the binding of Cd-ions in plants using meansurements of perturbed --directional correlations. 相似文献
138.
The amperometric behaviour of a copper electrode towards amino acids is studied by means of a rotating disc electrode. A theoretical model describing the anodic background current in a buffer solution and the increase of the current caused by amino acids is checked experimentally. The influences of the amino acid concentration, the rotation speed of the electrode and the composition of the buffer solution are studied. It is proved that chemical dissolution of a passivating film on the electrode surface, which is enhanced by the complexation reaction between the amino acid and copper(II) ions, is the principle of the phenomena observed. The applicability to flow systems is demonstrated. 相似文献
139.
Zusammenfassung Durch Messungen der Alterung (Verminderung der prozentualen Farbstoffaufnahme) der zwei aufeinander liegenden Oxyde auf anodisch
oxydiertem Aluminium wurde folgendes festgestellt:
Das genannteγ
2-Al2O3 weist keine wesentliche Alterung in der Luft und unter Wasser auf, da es kompakt und geordnet ist.
Dasγ
1-Al2O3 altert in der Luft und unter Wasser proportional der Zeit. Seine Alterungsgeschwindigkeit ist proportional der Herstellungsstromdichte.
Nach 12 A/dm2 nimmt die Alterung nicht mehr zu, da dieses Oxyd die maximale Fehlordnung besitzt. Die Alterung in der Luft ist kleiner als
unter Wasser, da dieses mit seinem L?sungsverm?gen für die Rekristallisation günstig ist. Mit zunehmender Temperatur nimmt
die Alterungsgeschwindigkeit bis 90°C zu und f?llt darüber hinaus bis zu Null (120°C). Bei h?heren Temperaturen findet eine
Verjüngung des Oxyds statt. Dieses Ph?nomen mit Temperaturmaximum ist zum ersten Mal bei heterogenen Reaktionen unter ?nderung
eines festen Stoffes festgestellt worden und bedeutet eine Rückreaktion entweder unter Bildung von neuen Fehlordnungen (die
Werte der Aktivierungsenergien der Hin- und Rückreaktion sind dafür plausibel) oder eine Freilegung von anwesenden aktiven
Zentren, wegen Desorption von Wasser. 相似文献
140.
von Euler H Olsson JM Hultenby K Thörne A Lagerstedt AS 《Bioelectrochemistry (Amsterdam, Netherlands)》2003,59(1-2):89-98
INTRODUCTION: Electrochemical treatment (EChT) has been taken under serious consideration as being one of several techniques for local treatment of malignancies. The advantage of EChT is the minimal invasive approach and the absence of serious side effects. Macroscopic, histopathological and ultra-structural findings in liver following a four-electrode configuration (dog) and a two-electrode EChT design (dog and rat) were studied. MATERIALS AND METHODS: 30 female Sprague-Dawley rats and four female beagle dogs were studied with EChT using Platinum:Iridium electrodes and the delivered dose was 5, 10 or 90 C (As). After EChT, the animals were euthanized. RESULTS: The distribution of the lesions was predictable, irrespective of dose and electrode configuration. Destruction volumes were found to fit into a logarithmic curve (dose-response). Histopathological examination confirmed a spherical (rat) and cylindrical/ellipsoidal (dog) lesion. The type of necrosis differed due to electrode polarity. Ultra-structural analysis showed distinct features of cell damage depending on the distance from the electrode. Histopathological and ultra-structural examination demonstrated that the liver tissue close to the border of the lesion displayed a normal morphology. CONCLUSIONS: The in vivo dose-planning model is reliable, even in species with larger tissue mass such as dogs. A multi-electrode EChT-design could obtain predictable lesions. The cellular toxicity following EChT is clearly identified and varies with the distance from the electrode and polarity. The distinct border between the lesion and normal tissue suggests that EChT in a clinical setting for the treatment of liver tumours can give a reliable destruction margin. 相似文献