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431.
Inagaki K Takatsu A Watanabe T Aoyagi Y Yarita T Okamoto K Chiba K 《Analytical and bioanalytical chemistry》2007,387(7):2325-2334
A new marine sediment certified reference material, NMIJ CRM 7306-a, for butyltin and phenyltin analysis has been prepared
and certified by the National Metrological Institute of Japan at the National Institute of Advanced Industrial Science and
Technology (NMIJ/AIST). Candidate sediment material was collected at a bay near industrial activity in Japan. After air-drying,
sieving, and mixing the material was sterilized with γ-ray irradiation. The material was re-mixed and packaged into 250 glass
bottles (15 g each) and these were stored in a freezer at −30 °C. Certification was performed by use of three different types
of species-specific isotope-dilution mass spectrometry (SSID–MS)—SSID–GC–ICP–MS, SSID–GC–MS, and SSID–LC–ICP–MS, with 118Sn-enriched organotin compounds synthesized from 118Sn-enriched metal used as a spike. The 118Sn-enriched mono-butyltin (MBT), dibutyltin (DBT), and tributyltin (TBT) were synthesized as a mixture whereas the 118Sn-enriched di-phenyltin (DPhT) and triphenyltin (TPhT) were synthesized individually. Four different extraction methods,
mechanical shaking, ultrasonic, microwave-assisted, and pressurized liquid extraction, were adopted to avoid possible analytical
bias caused by non-quantitative extraction and degradation or inter-conversion of analytes in sample preparations. Tropolone
was used as chelating agent in all the extraction methods. Certified values are given for TBT 44±3 μg kg−1 as Sn, DBT 51 ± 2 μg kg−1 as Sn, MBT 67 ± 3 μg kg−1 as Sn, TPhT 6.9 ± 1.2 μg kg−1 as Sn, and DPhT 3.4 ± 1.2 μg kg−1 as Sn. These levels are lower than in other sediment CRMs currently available for analysis of organotin compounds. 相似文献
432.
We have used a laminar flow stream formed by a microfabricated nozzle array to prepare cell-encapsulated alginate gel micro-tubes, in which cells formed a cylindrical multi-cellular aggregate after cultivation for two weeks. 相似文献
433.
Aoyagi S Sado Y Nishibori E Sawa H Okada H Tobita H Kasama Y Kitaura R Shinohara H 《Angewandte Chemie (International ed. in English)》2012,51(14):3377-3381
Rock solid: Fullerene-encapsulated Li(+) (Li(+) @C(60) ) is an alkaline cation owing to the spherical shape and positive charge. Li(+) @C(60) crystallizes as a rock-salt-type crystal in the presence of PF(6) (-) . The orientations of C(60) and PF(6) (-) (orange) are perfectly ordered below 370?K, and Li(+) (purple) hops within the cage. At temperatures below 100?K two Li(+) units are localized at two polar positions within each C(60) . 相似文献
434.
Hill JP Schumacher AL D'Souza F Labuta J Redshaw C Elsegood MR Aoyagi M Nakanishi T Ariga K 《Inorganic chemistry》2006,45(20):8288-8296
5,10,15,20-Tetrakis-3,5-di-tert-butyl-4-oxocyclohexadienylidene porphyrinogen and its di-N-benzylated derivative are solvatochromic dyes capable of binding anionic species. The influence of solvent polarity and hydrogen bonding on their electronic absorption spectra was observed. Hydrogen bonding by the porphyrinogen amine protons of acetone solvent molecules could be observed in the solid state. The acetone solvate of N21N23-dibenzyl-5,10,15,20-tetrakis-3,5-di-tert-butyl-4-oxocyclohexadienylidene porphyrinogen crystallized under anhydrous conditions in the space group P with cell dimensions a = 12.1693(11) A, b = 17.5849(13) A, c = 21.0965(17) A, alpha = 69.870(4) degrees , beta = 78.140(4) degrees , gamma = 82.865(5) degrees . These porphyrinogens are capable of binding a variety of anions and can be used to distinguish fluoride chromogenically from the other halide anions. Solvatochromism was combined with anion binding in an attempt to provide more selective tests for anions. The anion binding properties were investigated using UV/vis spectrophotometry and 1H NMR spectroscopy. 相似文献
435.
Islam Md. Rafiqul Kazuaki Shimada Shigenobu Aoyagi Yuji Takikawa Chizuko Kabuto 《Heteroatom Chemistry》2004,15(2):175-186
5H-1,2,4-oxathiazoles were efficiently synthesized from 6H-1,3,5-oxathiazine S-oxides by thermal cycloreversion of the substrates and the products were effectively converted into 1,2,4-thiadiazoles. © 2004 Wiley Periodicals, Inc. Heteroatom Chem 15:175–186, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20004 相似文献
436.
Keisuke Shigenobu Taku Sudoh Junichi Murai Kaoru Dokko Masayoshi Watanabe Kazuhide Ueno 《Chemical record (New York, N.Y.)》2023,23(8):e202200301
Highly concentrated electrolytes (HCEs) have a similarity to ionic liquids (ILs) in high ionic nature, and indeed some of HECs are found to behave like an IL. HCEs have attracted considerable attention as prospective candidates for electrolyte materials in future lithium secondary batteries owing to their favorable properties both in the bulk and at the electrochemical interface. In this study, we highlight the effects of the solvent, counter anion, and diluent of HCEs on the Li+ ion coordination structure and transport properties (e. g., ionic conductivity and apparent Li+ ion transference number measured under anion-blocking conditions, ). Our studies on dynamic ion correlations unveiled the difference in the ion conduction mechanisms in HCEs and their intimate relevance to values. Our systematic analysis of the transport properties of HCEs also suggests the need for a compromise to simultaneously achieve high ionic conductivity and high values. 相似文献
437.
Islam Md. Rafiqul Kazuaki Shimada Shigenobu Aoyagi Yoriko Fujisawa Yuji Takikawa 《Heteroatom Chemistry》2004,15(3):208-215
Treatment of 6H-1,3,5-oxathiazine S-oxides by Lawesson's reagent (LR) at high temperature furnished 3H-1,2,4-dithiazoles in moderate to good yields. Deoxygenation of 6H-1,3,5-oxathiazine S-oxides was performed by LR in the presence of EtOH. © 2004 Wiley Periodicals, Inc. Heteroatom Chem 15:208–215, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20011 相似文献
438.