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81.
M. Mazzocco C. Signorini M. Romoli R. Bonetti A. De Francesco A. De Rosa M. Di Pietro L. Fortunato T. Glodariu A. Guglielmetti G. Inglima T. Ishikawa H. Ishiyama R. Kanungo N. Khai S. Jeong M. La Commara B. Martin H. Miyatake T. Motobayashi T. Nomura D. Pierroutsakou M. Sandoli F. Soramel L. Stroe I. Sugai M. H. Tanaka E. Vardaci Y. Watanabe A. Yoshida K. Yoshida 《The European physical journal. Special topics》2007,150(1):37-40
The elastic scattering process for 11Be ions impinging on
a 209Bi target was studied in the energy range around the
Coulomb barrier. The angular distributions of the 11Be scattered
particles were analyzed within the optical model framework in order
to evaluate the reaction cross section, which turned out to be much larger
than the fusion one, especially in the sub-barrier region. The comparison
with the system 9Be + 209Bi showed that the reaction cross section
is larger for the reaction 11Be + 209Bi in the energy range around
the Coulomb barrier, while they are rather similar at higher bombarding energies.
This result suggests that direct processes related to the 11Be
halo structure and lower binding energy are more relevant
at near-barrier energies. 相似文献
82.
3+3]Cycloalkyne dimers linked by an azo group: a stable cis-azo compound forms polymeric aggregates by nonplanar pi-pi interactions 总被引:1,自引:0,他引:1
Saiki Y Sugiura H Nakamura K Yamaguchi M Hoshi T Anzai J 《Journal of the American Chemical Society》2003,125(31):9268-9269
We previously reported that the structure of the linker moiety controlled intramolecular and bimolecular aggregation of [3+3]cycloalkyne oligomers, which are cyclic acetylene derivatives containing helicenes. Here, novel [3+3]cycloalkyne dimers linked by the azo group are synthesized, and aggregation behaviors are studied, which turned out to be considerably different. The trans- and cis-azo compounds were synthesized by the oxidative coupling of a [3+3]cycloalkyne amine derivative, and the stereochemistry was determined by UV-vis spectroscopy. 1H NMR, CD, gel permeation chromatography analysis, and vapor pressure osmometry in chloroform revealed that the trans-isomer forms a strong and selective bimolecular aggregate. The cis-isomer forms a trimolecular aggregate at a concentration below 1 mM and a polymeric aggregate at above 1 mM. Unlike known diaryl azo compounds, these azo isomers do not interconvert when subjected to heating or irradiation. In contrast, a model compound lacking the cyclic helicene structure isomerizes readily. 相似文献
83.
Sugiura H Nigorikawa Y Saiki Y Nakamura K Yamaguchi M 《Journal of the American Chemical Society》2004,126(45):14858-14864
Optically active acyclic ethynylhelicene oligomers were synthesized in high yields by a two-directional method involving Sonogashira coupling and deprotection. Their CD spectra in chloroform exhibited large differences between the oligomers with less than seven helicenes and their higher homologues, which indicated the formation of helical structures for the latter and random coil structures for the former. The helical heptamer gradually unfolded to a random coil structure in chloroform at room temperature. The unfolding rate was examined by CD in several aromatic solvents as well, and the rate constant k was found to be highly dependent on the type of aromatic substituent: k differed by seven orders of magnitude between iodobenzene and trifluoromethylbenzene. Several features of the rates are notable: The reaction rates in halobenzenes were in the order of iodobenzene > bromobenzene > chlorobenzene > benzene > fluorobenzene > m-difluorobenzene, those in alkylbenzenes were styrene > phenylacetylene > ethylbenzene > toluene > benzene, and those in heteroatom-substituted arenes were thioanisole > benzonitrile > anisole > ethyl benzoate > benzene > trifluoromethylbenzene. The log k values exhibited good correlation with the absolute hardness, eta, of the arenes, and higher unfolding rates were observed in the soft arenes. Vapor pressure osmometry studies indicated that the helical structure of the heptamer is dimeric in benzene, fluorobenzene, and trifluoromethylbenzene, while the random coil structure of the heptamer is monomeric in chloroform and toluene. When a chloroform solution of the random coil structure was concentrated to a small volume, the helical structure could be regenerated. 相似文献
84.
Kenji Miyatake Allan S. Hay 《Journal of polymer science. Part A, Polymer chemistry》2001,39(11):1854-1859
Three arylene difluoride monomers containing phosphine oxide ( 1 ), phosphinic acid ( 2 ), or phosphinate ester ( 3 ) groups were prepared and polymerized with bisphenol A to give novel poly-(arylene ether)s ( 4 , 5 , and 6 ). The polymers obtained had moderate molecular weights (ηinh: 0.14–0.30 dL g−1 in N-methylpyrrolidinone) and glass-transition temperatures (Tg: 102–200 °C), depending on the phosphine group in the main chain. Using bis(4-fluorophenyl)sulfone as a comonomer improved the polymerization to give copolymers with higher solution viscosities. The stoichiometric investigation revealed that 7 mol % excess of fluoride monomer gave the highest molecular weight copolymer 8 with ηinh of 0.78 dL g−1, which had a Tg of 176 °C, a T of 432 °C, and formed a hard film by casting from solution. © 2001 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 39: 1854–1859, 2001 相似文献
85.
Dr. Toshiharu Ishizaki Hideaki Karasaki Dr. Yuto Kage Misaki Kamioka Yitong Wang Dr. Shigeki Mori Prof. Dr. Naoto Ishikawa Prof. Dr. Takamitsu Fukuda Prof. Dr. Hiroyuki Furuta Prof. Dr. Soji Shimizu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(49):12686-12692
A novel pyrrolopyrrole azadipyrrin ( Janus-PPAD ) with Janus duality was synthesized by a Schiff base–forming reaction of diketopyrrolopyrrole. The orthogonal interactions of the hydrogen-bonding ketopyrrole and metal-coordinating azadipyrrin moieties in Janus-PPAD enabled the metal ions to be arranged at regular intervals: zinc(II) and cobalt(II) coordination provided metal-coordinated Janus-PPAD dimers, which can subsequently form hydrogen-bonded one-dimensional arrays both in solution and in the solid state. The supramolecular assembly of the zinc(II) complex in solution was investigated by 1H NMR spectroscopy based on the isodesmic model, in which a binding constant for the elongation of assemblies is constant. Owing to the tetrahedral coordination, in the solid state, the cobalt(II) complex exhibited a slow magnetic relaxation due to the negative D value of −27.1 cm−1 with an effective relaxation energy barrier Ueff of 38.0 cm−1. The effect of magnetic dilution on the relaxation behavior is discussed. The relaxation mechanism at low temperature was analyzed by considering spin lattice interactions and quantum tunneling effects. The easy-axis magnetic anisotropy was confirmed, and the relevant wave functions were obtained by ab initio CASSCF calculations. 相似文献
86.
Copper‐Catalyzed γ‐Selective and Stereospecific Allylic Cross‐Coupling with Secondary Alkylboranes
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Yuto Yasuda Kazunori Nagao Yoshinori Shido Prof. Dr. Seiji Mori Prof. Dr. Hirohisa Ohmiya Prof. Dr. Masaya Sawamura 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(27):9666-9670
The scope of the copper‐catalyzed coupling reactions between organoboron compounds and allylic phosphates is expanded significantly by employing triphenylphosphine as a ligand for copper, allowing the use of secondary alkylboron compounds. The reaction proceeds with complete γ‐E‐selectivity and preferential 1,3‐syn stereoselectivity. The reaction of γ‐silicon‐substituted allylic phosphates affords enantioenriched α‐stereogenic allylsilanes. 相似文献
87.
Rebekka Anna Bohmann Yuto Unoh Prof. Dr. Masahiro Miura Prof. Dr. Carsten Bolm 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(20):6783-6786
A one‐pot Michael addition/cyclization/condensation reaction sequence for the regioselective synthesis of 1,2‐thiazines, starting from propargyl ketones and NH‐sulfoximines or NH‐sulfondiimines, has been developed. Under mild and operationally simple reaction conditions previously unprecedented 1,2‐thiazine 1‐imide and 1‐oxide derivatives are formed in good to excellent yields. The products represent heterocyclic building blocks, readily modifiable by a regioselective C?H bond functionalization, classical cross‐coupling reactions, and deprotection. 相似文献
88.
Takahiro Ishii Miyu Miyagi Yuto Shinjo Yu Minamida Hiroshi Matsuura Tsuyoshi Abe 《Natural product research》2020,34(19):2787-2793
AbstractWe report on the chemical characteristics of the red alga Laurencia japonensis, collected off the coast of Yoshio, Katsuura, Boso Peninsula, Japan. We isolated two new brominated C15-acetogenins in this species, which we name katsuurenyne A (1) and katsuurenyne B (2), along with two already known halogenated terpenes [2,10-dibromo-3-chloro-α-chamigrene (7) and aplysiadiol (8)]. We extensively analysed spectral data (from IR, ESI-MS, 1D-NMR and 2D-NMR) to confirm the structure of these compounds. 相似文献
89.
Partially fluorinated and ammonium‐functionalized terpolymers: Effect of aliphatic groups on the properties of anion conductive membranes
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Hideaki Ono Junpei Miyake Kenji Miyatake 《Journal of polymer science. Part A, Polymer chemistry》2017,55(8):1442-1450
Synthesis and properties of a series of ammonium‐containing terpolymers (QPAF‐3) as anion conductive membranes are reported. The QPAF‐3s composed of perfluoroalkylene, alkylene, and ammonium‐functionalized phenylene groups without heteroatom linkages in the main chain were synthesized via nickel‐mediated polycondensation reaction, followed by chloromethylation, quaternization, and ion exchange reactions. Self‐standing, bendable membranes were obtained by solution casting. The QPAF‐3 membrane with optimized terpolymer composition and ion exchange capacity (1.46 meq g?1) showed high hydroxide ion conductivity (123 mS cm?1 in water at 80 °C). The alkaline stability test in 1 M KOH for 1000 h at 80 °C and the post‐test analysis with IR spectra and tensile strength suggested that ammonium groups were likely to be decomposed while the polymer main chain was chemically more robust. The presence of the alkylene groups in the terpolymers lowered solubility, glass transition temperature, and elongation property of the resulting membranes. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55 , 1442–1450 相似文献
90.
T. Shimoda K. Tajiri K. Kura A. Odahara M. Suga Y. Hirayama N. Imai H. Miyatake M. Pearson C. D. P. Levy K. P. Jackson R. Legillon C. Petrache T. Fukuchi N. Hamatani T. Hori M. Kazato Y. Kenmoku T. Masue H. Nishibata T. Suzuki A. Takashima R. Yokoyama 《Hyperfine Interactions》2014,225(1-3):183-191
Spin-polarized radioactive nuclear beams at TRIUMF enable a new spectroscopic method which efficiently assigns spins and parities of the daughter levels by taking advantage of the asymmetric β-decay of the polarized parent nucleus. This method was successfully applied to structure studies of 29Mg and 30Mg in connection with the physics of the “island of inversion”. In 29Mg, two low-lying levels with intruder configuration were assigned. In 30Mg, coexistence of spherical shape, prolate shape and γ-collectivity was strongly suggested. 相似文献