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排序方式: 共有163条查询结果,搜索用时 15 毫秒
1.
S. A. Soldatova J. A. Rodriguez Alarcon A. T. Soldatenkov 《Chemistry of Heterocyclic Compounds》1994,30(1):69-72
High-temperature heterocyclization of -benzylisoquinolines on oxide-type catalysts gave angular indolo[2,1a] isoquinoline.For Communication 4 see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 79–82, January, 1994. 相似文献
2.
Jorge A. R. Alarcon A. T. Soldatenkov S. A. Soldatova Alicia U. Samalloa Juan U. Obando N. S. Prostakov 《Chemistry of Heterocyclic Compounds》1993,29(9):1054-1058
2,3,8,9-Tetramethoxy-11-phenyldibenz[2,3;7,8]indolizine was obtainedinhighyieldfrom (6,7-dimethoxyisoquinolin-1-yl)-(3,4-dimethylphenyl)phenylcarbinol by cyclization in the presence of formic acid. The behavior of (6,7-dimethoxyisoquinolin-1-yl)-(3,4-dimethoxyphenyl)methylcarbinol and (6,7-dimethoxyisoquinolin-1-yl-(3,4-dimethoxyphenyl)carbinol was studied under these same conditions. 2,3,7,8-Tetramethoxy-11-phenyl-5,6-dihydrodibenz[2,3;7,8]indolizine was obtained by hydrogenation on rhenium heptasulfide.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1233–1238, September, 1993. 相似文献
3.
4.
Madeline J. Simpson Horacio Poblete May Griffith Emilio I. Alarcon Juan C. Scaiano 《Photochemistry and photobiology》2013,89(6):1433-1441
The role of recombinant Type‐I human collagen in the free form or forming AgNP@collagen on the photophysical and photochemical behavior of rose Bengal was analyzed. The formation of dye aggregates on the protein surface was experimentally observed and corroborated by docking calculations. The formation of such aggregates is believed to change the main oxidative mechanism from Type‐II (singlet oxygen) to Type‐I (free radical) photosensitization. Remarkably, the presence of AgNP in the form of AgNP@collagen altered the dynamics of dye triplet deactivation, effectively preventing the dye degradation and reducing the extent of protein crosslinked. Both crosslinked rHC and AgNP@collagen were able to support fibroblasts proliferation, but only the material containing silver was resistant to S. epidermidis infection. 相似文献
5.
Emission of volatile sesquiterpenes and monoterpenes in grapevine genotypes following Plasmopara viticola inoculation in vitro 下载免费PDF全文
Alberto Algarra Alarcon Valentina Lazazzara Luca Cappellin Pier Luigi Bianchedi Rainer Schuhmacher Georg Wohlfahrt Ilaria Pertot Franco Biasioli Michele Perazzolli 《Journal of mass spectrometry : JMS》2015,50(8):1013-1022
The grapevine (Vitis vinifera) is one of the most widely cultivated fruit crops globally, and one of its most important diseases in terms of economic losses is downy mildew, caused by Plasmopara viticola. Several wild Vitis species have been found to be resistant to this pathogen and have been used in breeding programs to introduce resistance traits to susceptible cultivars. Plant defense is based on different mechanisms, and volatile organic compounds (VOCs) play a major role in the response to insects and pathogens. Although grapevine resistance mechanisms and the production of secondary metabolites have been widely characterized in resistant genotypes, the emission of VOCs has not yet been investigated following P. viticola inoculation. A Proton Transfer Reaction‐Time of Flight‐Mass Spectrometer (PTR‐ToF‐MS) was used to analyze the VOCs emitted by in vitro‐grown plants of grapevine genotypes with different levels of resistance. Downy mildew inoculation significantly increased the emission of monoterpenes and sesquiterpenes by the resistant SO4 and Kober 5BB genotypes, but not by the susceptible V. vinifera Pinot noir. Volatile terpenes were implicated in plant defense responses against pathogens, suggesting that they could play a major role in the resistance against downy mildew by direct toxicity or by inducing grapevine resistance. The grapevine genotypes differed in terms of the VOC emission pattern of both inoculated and uninoculated plants, indicating that PTR‐ToF‐MS could be used to screen hybrids with different levels of downy mildew resistance. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
6.
Niedermaier O Scheit H Bildstein V Boie H Fitting J von Hahn R Köck F Lauer M Pal UK Podlech H Repnow R Schwalm D Alvarez C Ames F Bollen G Emhofer S Habs D Kester O Lutter R Rudolph K Pasini M Thirolf PG Wolf BH Eberth J Gersch G Hess H Reiter P Thelen O Warr N Weisshaar D Aksouh F Van den Bergh P Van Duppen P Huyse M Ivanov O Mayet P Van de Walle J Aystö J Butler PA Cederkäll J Delahaye P Fynbo HO Fraile LM Forstner O Franchoo S Köster U Nilsson T Oinonen M Sieber T Wenander F Pantea M 《Physical review letters》2005,94(17):172501
We report on the first radioactive beam experiment performed at the recently commissioned REX-ISOLDE facility at CERN in conjunction with the highly efficient gamma spectrometer MINIBALL. Using 30Mg ions accelerated to an energy of 2.25 MeV/u together with a thin (nat)Ni target, Coulomb excitation of the first excited 2+ states of the projectile and target nuclei well below the Coulomb barrier was observed. From the measured relative deexcitation gamma-ray yields the B(E2;0(+)gs-->2(+)1) value of 30Mg was determined to be 241(31)e2 fm4. Our result is lower than values obtained at projectile fragmentation facilities using the intermediate-energy Coulomb excitation method, and confirms the theoretical conjecture that the neutron-rich magnesium isotope 30Mg resides outside the "island of inversion." 相似文献
7.
Valiente-Dobón JJ Steinhardt T Svensson CE Afanasjev AV Ragnarsson I Andreoiu C Austin RA Carpenter MP Dashdorj D de Angelis G Dönau F Eberth J Farnea E Freeman SJ Gadea A Garrett PE Görgen A Grinyer GF Hyland B Jenkins D Johnston-Theasby F Joshi P Jungclaus A Lieb KP Macchiavelli AO Moore EF Mukherjee G Napoli DR Phillips AA Plettner C Reviol W Sarantites D Schnare H Schumaker MA Schwengner R Seweryniak D Smith MB Stefanescu I Thelen O Wadsworth R 《Physical review letters》2005,95(23):232501
Three rotational bands in 74Kr were studied up to (in one case one transition short of) the maximum spin I(max) of their respective single-particle configurations. Their lifetimes have been determined using the Doppler-shift attenuation method. The deduced transition quadrupole moments reveal a modest decrease, but far from a complete loss of collectivity at the maximum spin I(max). This feature, together with the results of mean field calculations, indicates that the observed bands do not terminate at I = I(max). 相似文献
8.
The Bates Larger Acceptance Spectrometer Toroid (BLAST) is a detector designed to study in a comprehensive and precise way the spin dependent electromagnetic response of few-body nuclei. The BLAST scientific program is focussed on the study of these systems in terms of nucleon structure, the ground state few body structure built from the nucleon-nucleon interaction and the nature of the interaction of the virtual photon forQ 2≤1 (GeV/c)2). To accomplish its scientific goals, BLAST utilizes the latest technology available in the form of polarized electron scattering from pure, polarized internal gas targets. The Bates Soung Hall Ring (SHR) delivers longitudinally polarized electrons at the location of the BLAST detector. Measurement are currently underway, and and a brief status report is presented here. 相似文献
9.
N.?WarrEmail author J.?Eberth G.?Pascovici H.?G.?Thomas D.?Wei?haar The MINIBALL Collaboration 《The European Physical Journal A - Hadrons and Nuclei》2003,20(1):65-66
MINIBALL is a new spectrometer of position-sensitive Ge detectors designed for nuclear-structure studies at the REX-ISOLDE (D. Habs et al. , Prog. Part. Nucl. Phys. 38, 111 (1997)) radioactive-beam facility at CERN. It combines high efficiency and high granularity, using pulse-shape analysis and 6-fold segmented Ge detectors.Received: 24 October 2002, Published online: 17 February 2004PACS:
29.30.-h Spectrometers and spectroscopic techniques 相似文献
10.
K. Bharuth-Ram J. Billowes J. Heese C. J. Gross K. P. Lieb N. Martin S. Skoda J. Eberth 《Hyperfine Interactions》1990,59(1-4):109-112
The IMPAD technique has been used to determine the Larmor precessions of the83Y 595 keV 13/2+ and 145 keV 7/2+ states in iron. The net precessions found are ωτ(13/2+)=−9(2) mrad and ωτ(7/2+)=−92(5) mrad, leading to g-factors, g(13/2+)=+1.3(4) and g(7/2+)=+0.61(18). These results are discussed in terms of a partially decoupled [422]5/2+ Nilsson band. 相似文献