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111.
Bortoletto D Brown DN Fast J McIlwain RL Miao T Miller DH Modesitt M Schaffner SF Shibata EI Shipsey IP Wang PN Battle M Ernst J Kroha H Roberts S Sparks K Thorndike EH Wang CH Dominick J Sanghera S Skwarnicki T Stroynowski R Artuso M He D Goldberg M Horwitz N Kennett R Moneti GC Muheim F Mukhin Y Playfer S Rozen Y Stone S Thulasidas M Vasseur G Zhu G Bartelt J Csorna SE Egyed Z Jain V Sheldon P Akerib DS Barish B Chadha M Chan S Cowen DF Eigen G Miller JS O'Grady C Urheim J Weinstein AJ 《Physical review letters》1993,71(12):1791-1795
112.
Avery P Besson D Garren L Yelton J Kinoshita K Pipkin FM Procario M Wilson R Wolinski J Xiao D Zhu Y Ammar R Baringer P Coppage D Haas P Kwak N Lam H Ro S Kubota Y Nelson JK Perticone D Poling R Fulton R Jensen T Johnson DR Kagan H Kass R Morrow F Whitmore J Wilson P Bortoletto D Dominick J McIlwain RL Miller DH Ng CR Schaffner SF Shibata EI Shipsey IP Yao W Sparks K Thorndike EH Wang C Alam MS Kim IJ Li WC Lou XC Romero V Sun CR Wang P Zoeller MM Goldberg M Haupt T Horwitz N Jain V Mestayer MD 《Physical review D: Particles and fields》1991,43(11):3599-3610
113.
Barbaro P Bianchini C Dal Santo V Meli A Moneti S Psaro R Scaffidi A Sordelli L Vizza F 《Journal of the American Chemical Society》2006,128(21):7065-7076
The complex Rh(cod)(sulfos) (Rh(I); sulfos = (-)O(3)S(C(6)H(4))CH(2)C(CH(2)PPh(2))(3); cod = cycloocta-1,5-diene), either free or supported on silica, does not catalyze the hydrogenation of benzene in either homogeneous or heterogeneous phase. However, when silica contains supported Pd metal nanoparticles (Pd(0)/SiO(2)), a hybrid catalyst (Rh(I)-Pd(0)/SiO(2)) is formed that hydrogenates benzene 4 times faster than does Pd(0)/SiO(2) alone. EXAFS and DRIFT measurements of in situ and ex situ prepared samples, batch catalytic reactions under different conditions, deuterium labeling experiments, and model organometallic studies, taken together, have shown that the rhodium single sites and the palladium nanoparticles cooperate with each other in promoting the hydrogenation of benzene through the formation of a unique entity throughout the catalytic cycle. Besides decreasing the extent of cyclohexa-1,3-diene disproportionation at palladium, the combined action of the two metals activates the arene so as to allow the rhodium sites to enter the catalytic cycle and speed up the overall hydrogenation process by rapidly reducing benzene to cyclohexa-1,3-diene. 相似文献
114.
115.
C. Mealli S. Midollini S. Moneti L. Sacconi 《Journal of organometallic chemistry》1981,205(2):273-279
The [(C3Ph3)Ni(PPh3)2]ClO4 complex reacts with the tridentate ligands, 1,1,1-tris(dimethylphosphinomethyl)ethane, 1,1,1-tris(diphenylphosphinomethyl)ethane, (bis(2-diphenylphosphino)ethyl)phenylphosphine, (bis(2-diphenylphosphino)ethyl)-n-propylamine, and 1,1,1-tris(diphenylarsinomethyl)ethane to give cationic η3-triphenylcyclopropenyl complexes of formula [(C3Ph3)NiL]Y (Y = ClO4, BPh4). An uncharged derivative with the formula [(C3Ph3)Ni(hb(3,5-me2Pz)3)] (hb(3,5-me2Pz)3 = hydrotris(3,5-dimethyl-1-pyrazolyl)borate) has also been prepared. The molecular structure of [(C3Ph3)Ni(triphos)]ClO4 has been determined from counter diffraction data. The crystals are monoclinic, space group P21/n with cell dimensions: a 17.750(5), b 17.629(5), c 16.509(4) Å; β 92-59(9)°, Dc = 1.359 g cm?3 for Z = 4. Full matrix least-squares refinement led to the conventional R factor of 0.064 for 2556 observed reflections. The molecular structure consists of [(C3Ph3)Ni(triphos)]+ cations and ClO4? anions. The nickel atom is coordinated to the three phosphorus atoms of the triphos ligand, and to the C3Ph3 fragment in a symmetric η3 fashion. 相似文献
116.
J.H. Cobb S. Iwata R.B. Palmer D.C. Rahm P. Rehak I. Stumer C.W. Fabjan E. Fowler I. Mannelli P. Mouzourakis K. Nakamura A. Nappi W.J. Willis M. Goldberg N. Horwitz G.C. Moneti A.J. Lankford C. Kourkoumelis 《Physics letters. [Part B]》1978,78(4):519-522
The hadronic production of electron pairs with masses between 200 and 500 MeV and large transverse momentum has been measured at the CERN Intersecting Storage Rings (ISR). The expected relation between low-mass electron pairs and real photons is used to determine the direct hadronic production of photons. Contrary to indications from some previous experiments, the observed spectrum is consistent with expectations from the decay of known mesons, and leads to a value for the ratio of direct photons to π0 of γ/π0 = (0.55 ± 0.92)% for 2 < pT < 3 GeV and 〈√s〉 = 55 GeV. 相似文献
117.
C. Kourkoumelis L.K. Resvanis T.A. Filippas E. Fokitis A.M. Cnops S. Iwata R.B. Palmer D.C. Rahm P. Rehak I. Stumer C.W. Fabjan T. Fields D. Lissauer I. Mannelli P. Mouzourakis A. Nappi W.J. Willis M. Goldberg G.C. Moneti 《Physics letters. [Part B]》1979,85(1):147-150
The correlation between a high transverse momentum π0and η and a second π0 have been measured using an apparatus with large azimuthal acceptance. The angular distribution of α, measuring the deviation from collinearity in azimuth, peaks near zero. The r.m.s. of the distribution is found to have an inverse logarithmic rather than a fall-off. 相似文献
118.
We propose to engineer the atomic band structure in optical lattices in order to design a Fabry-Perot interferometer with large mode spacing and strong nonlinear coupling to be employed in atom optics. The use of an optical lattice allows for a significant reduction of the atomic effective mass, while the slow modulation of its parameters spatially confines the matter waves on a length scale of a few dozen optical wavelengths. As a consequence, the mode spacing in such a cavity would be as high as one-tenth of the recoil energy, allowing for a very efficient filter action, while the nonlinear coupling due to interatomic interactions could lead to bistability and limiting effects in the transmission of the atomic beam. 相似文献
119.
Cronin-Hennessy D Lyon AL Thorndike EH Savinov V Coan TE Fadeyev V Gao YS Maravin Y Narsky I Stroynowski R Ye J Wlodek T Artuso M Ayad R Boulahouache C Bukin K Dambasuren E Karamov S Majumder G Moneti GC Mountain R Schuh S Skwarnicki T Stone S Wang JC Wolf A Wu J Kopp S Kostin M Mahmood AH Csorna SE Danko I McLean KW Xu Z Godang R Bonvicini G Cinabro D Dubrovin M McGee S Zhou GJ Lipeles E Pappas SP Schmidtler M Shapiro A Sun WM Weinstein AJ Würthwein F Jaffe DE Masek G Paar HP Potter EM Prell S 《Physical review letters》2001,86(17):3730-3734
The CLEO experiment at the CESR collider has used 13.7 fb(-1) of data to search for the production of the Omega(0)(c) (css ground state) in e(+)e(-) collisions at square root of (s) approximately 10.6 GeV. The modes used to study the Omega(0)(c) are Omega(-)pi(+), Omega(-)pi(+)pi(0), Xi-K-pi(+)pi(+), Xi0K-pi(+), and Omega(-)pi(+)pi(+)pi(-). We observe a signal of 40.4+/-9.0(stat) events at a mass of 2694.6+/-2.6(stat)+/-1.9(syst) MeV/c(2), for all modes combined. 相似文献
120.
Molin L Seraglia R Dani FR Moneti G Traldi P 《Rapid communications in mass spectrometry : RCM》2011,25(20):3091-3096
1,5‐Diaminonaphthalene (DAN) has been described as an interesting and effective matrix for matrix‐assisted laser desorption/ionization (MALDI) experiments in positive ion mode, being able to activate in‐source decomposition phenomena and, when employed for the analysis of proteins containing disulphide bridge(s), being able to activate reduction processes, resulting in disulphide bridge cleavage. The mechanisms of the DAN reactivity have been studied in detail, and the results indicate that the reduction properties of the matrix are of a radical nature. In the present study the structure of the reactive species produced by DAN, responsible for its reductive properties, has been investigated by accurate mass measurements and tandem mass spectrometry (MS/MS) experiments. Contrary to what is usually observed by laser irradiation of other MALDI matrices (with the sole formation of the MH+ ion of the matrix), DAN leads to the formation of odd‐electron molecular ions M+?. This can be rationalized by the occurrence of two photon pooling processes, due to the low ionization energy of DAN. Thus the M+? ion of DAN can be considered responsible for both analyte protonation and disulphide bond reduction and some mechanisms are proposed for this behaviour. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献