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21.
Timur I. Abdullin Oksana V. Bondar Irina I. Nikitina Emil R. Bulatov Michail V. Morozov Albert Kh. Hilmutdinov Myakzyum Kh. Salakhov Mustafa ulha 《Bioelectrochemistry (Amsterdam, Netherlands)》2009,77(1):37-42
We studied the electrochemical properties of gold nanoparticles (GNPs) and their complexes with proteins using square-wave voltammetry. Effect of the nanoparticle size and detection procedure was explored upon the oxidation of GNPs on a glassy carbon electrode (GCE). For pre-characterized GNPs of 13, 35 and 78 nm diameter, the oxidation peak potential was + 0.98, + 1.03 and + 1.06 V vs. Ag/AgCl, respectively. The conjugation of GNPs with four different proteins was verified by UV–Vis spectroscopy and atomic force microscopy indicated the formation of protein shells around GNPs. This process hampered the oxidation of GNPs on bare GCE causing pronounced decrease in the current response by an average factor of 72. GCE modification with carbon nanotubes weakly influenced the sensitivity of GNP detection but resulted in a 14.5-fold signal increase averaged for all GNP–protein complexes. The acidic dissolution and electrodeposition of GNPs or their complexes adsorbed on GCE allowed superior signal amplification directly proportional to nanoparticle size. The results are useful for the optimization of voltammetric analysis of GNP–protein complexes and can be extended to the characterization of other metal nanostructures and their complexes with biological components. 相似文献
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Igor A. Sedov Timur I. Magsumov Erin Hart Elizabeth Higgins Damini Grover Heidi Zettl Minaz Zad William E. AcreeJr. Michael H. Abraham 《Journal of solution chemistry》2017,46(2):331-351
A gas chromatographic headspace analysis method was used to experimentally determine gas-to-liquid partition coefficients and infinite dilution activity dilution for 14 different aliphatic and cyclic hydrocarbons (alkanes, cycloalkanes, alkenes, alkynes), eight different aromatic compounds (benzene, alkylbenzenes, halobenzenes), five different chloroalkanes (dichloromethane, trichloromethane, 1-chlorobutane, 1,2-dichloropropane, isopropylbromide), tetrahydrofuran, butyl acetate, and acetonitrile dissolved in diethylene glycol at 298.15 K. Solubilities were also measured at 298.15 K for 31 crystalline nonelectrolyte organic solutes including several polycyclic aromatic hydrocarbons and substituted benzoic acid derivatives. The experimental results of the headspace chromatographic and spectroscopic solubility measurements were converted to gas-to-diethylene glycol and water-to-diethylene glycol partition coefficients, and molar solubility ratios using standard thermodynamic relationships. Expressions were derived for solute transfer into diethylene glycol from the calculated partition coefficients and solubility ratios. Mathematical correlations based on the Abraham model describe the observed partition coefficient and solubility data to within 0.14 log10 units (or less). 相似文献
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T.?I.?MadzhidovEmail author T.?R.?Gimadiev D.?A.?Malakhova R.?I.?Nugmanov I.?I.?Baskin I.?S.?Antipin A.?A.?Varnek 《Journal of Structural Chemistry》2017,58(4):650-656
By the structural representation of a chemical reaction in the form of a condensed graph a model allowing the prediction of rate constants (logk) of Diels–Alder reactions performed in different solvents and at different temperatures is constructed for the first time. The model demonstrates good agreement between the predicted and experimental logk values: the mean squared error is less than 0.75 log units. Erroneous predictions correspond to reactions in which reagents contain rarely occurring structural fragments. The model is available for users at https://cimm.kpfu.ru/predictor/. 相似文献
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Weidner T Zharnikov M Hoβbach J Castner DG Siemeling U 《The journal of physical chemistry. C, Nanomaterials and interfaces》2010,114(35):14975-14982
Self-assembled monolayers (SAMs) can decorate surfaces with `smart′ functional units possessing reversible stimulus-response behavior for optical, thermal, magnetic or redox-chemical stimuli. An independent performance of individual functional groups in such a film is desirable, which can be, in particular, ensured by fairly large lateral separations between tailgroups in the SAM. Adsorbate molecules with multiple attachment points are very promising in this context owing to their large surface footprint, which covers a surface area exceeding the lateral dimensions of the functional groups. To address these design constraints, novel tridentate long-chain tripodal thioether ligands with central adamantine units and a redox-active ferrocenyl tailgroup, 1-[4-(ferrocenylethynyl)phenyl]-3,5,7-tri[(4-n-octylsulfanyl)phenyl]adamantine (T8) and 1-[4-(ferrocenylethynyl)phenyl]-3,5,7-tri[(4-n-dodecylsulfanyl)phenyl]adamantine (T12), were synthesized and used as tripodal adsorbate molecules for the fabrication of redox-active ferrocenyl-terminated SAMs on Au(111). These SAMs were characterized by X-ray photoelectron spectroscopy, near edge X-ray absorption fine structure spectroscopy and sum frequency generation spectroscopy. The data suggest that T8 and T12 form almost contamination-free, well-aligned and fairly densely-packed SAMs on Au(111) with laterally separated ferrocenyl units. The SAMs show a homogeneous binding chemistry, an important requirement for high fidelity SAMs. SFG results indicate lateral interactions between neighboring molecules via the long-chain binding units. 相似文献
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Timur I. Nezhmetdinov 《代数通讯》2013,41(12):4669-4681
Let R be a finite commutative ring with identity and ? p d be the cyclic group of prime power order. Define R? p d to mean the group ring of ? p d over R. We determine the structure of the group of units of R? p d in the case when R is generated by an element whose order is not divisible by p. 相似文献
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Semion I. Kuchanov Konstantin V. Tarasevich Timur V. Zharnikov 《Journal of statistical physics》2006,122(5):875-908
The statistical theory of gelation in the simplest process of the non-random polycondensation (S. I. Kuchanov, T. V. Zharnikov,
J. Stat. Phys., 111(5/6), 1273 (2003)) has been refined as to be able to take into account the effect of a monomer configuration
on topological characteristics of the polymer network of the gel. Proceeding from the kinetic analysis of such a polycondensation,
we rigorously prove that it can be described in terms of some stochastic branching process. The parameters of the process
depend on the overall number of functional groups in the monomer as well as on the pattern of their mutual arrangement. Examples
of some model systems illustrate the effect of kinetic and configurational factors on the topology of a polymer network formed
in the course of non-random polycondensation. 相似文献