全文获取类型
收费全文 | 164篇 |
免费 | 0篇 |
专业分类
化学 | 53篇 |
晶体学 | 1篇 |
力学 | 8篇 |
数学 | 15篇 |
物理学 | 81篇 |
无线电 | 6篇 |
出版年
2020年 | 1篇 |
2019年 | 3篇 |
2018年 | 1篇 |
2016年 | 4篇 |
2015年 | 3篇 |
2014年 | 2篇 |
2013年 | 5篇 |
2012年 | 10篇 |
2011年 | 8篇 |
2010年 | 6篇 |
2009年 | 13篇 |
2008年 | 5篇 |
2007年 | 6篇 |
2006年 | 7篇 |
2005年 | 4篇 |
2004年 | 4篇 |
2003年 | 5篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 4篇 |
1997年 | 4篇 |
1996年 | 2篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 1篇 |
1991年 | 5篇 |
1990年 | 3篇 |
1989年 | 6篇 |
1988年 | 2篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 4篇 |
1984年 | 3篇 |
1983年 | 4篇 |
1982年 | 2篇 |
1980年 | 1篇 |
1979年 | 4篇 |
1977年 | 2篇 |
1971年 | 1篇 |
1938年 | 2篇 |
1937年 | 3篇 |
1936年 | 2篇 |
1935年 | 1篇 |
排序方式: 共有164条查询结果,搜索用时 0 毫秒
71.
Godbole MD Roubeau O Mills AM Kooijman H Spek AL Bouwman E 《Inorganic chemistry》2006,45(17):6713-6722
The three novel clusters [Mn6O4(OMe)2(OAc)4(Mesalim)4] (3), [Mn8O2(OH)2(OMe)12(OAc)2(Mesalim)4] (4), and [Fe10O4(OMe)14Cl2(Mesalim)6] (5) have been synthesized from a simple bidentate ligand HMesalim (HMesalim = methyl salicylimidate). Starting from the mononuclear complex [Mn(Mesalim)2(OAc)(MeOH)].MeOH (1), either the hexanuclear complex 3 or the octanuclear complex 4 is obtained after recrystallization, depending upon the reaction conditions and solvents used. Similarly, starting from the purple-colored mononuclear complex [Fe(Mesalim)2Cl] (2), the orange-colored decanuclear iron(III) cluster 5 has been obtained upon recrystallization from methanol. Complex 3, which could also be prepared directly from manganese acetate and the ligand, has a face-sharing double-cubane [Mn6O6] core, unique in transition metal chemistry. Compounds 4 and 5 are composed of [M3O4] partial cubanes. All complexes belong to a class of oxo-bridged cubic close-packed molecular clusters resembling the metal oxide/hydroxide ores. Complex 4 exhibits intramolecular ferromagnetic interactions, as evidenced from dc magnetic susceptibility studies (1.8-300 K), resulting in a high-spin ground state, probably with S(T) = 8. Complex 4 displays single molecule magnet behavior as indicated by frequency and temperature dependences of its ac susceptibility. An Arrhenius plot gave relatively large experimental activation energy of 36.0 K. The magnetic properties of complexes 3 and 5 are dominated by antiferromagnetic interactions leading to zero-spin ground states. 相似文献
72.
73.
S. V. Godbole P. N. Iyer M. L. Jayanth Kumar M. D. Sastry 《Journal of Radioanalytical and Nuclear Chemistry》1996,214(1):9-16
Double sulfates of thallium and lanthanides form an interesting series of compounds with first fractional crystallization leading to the formation of tetrahydrated double sulfates. The radiation induced defects including changes in the oxidation states were studied by carrying out EPR investigations of -irradiated Tl (I) Ln (III) (SO4)2.4H2O (Ln=Sm, Eu and Nd) compounds. The important finding of these investigations is the formation of a radiation-induced paramagnetic center Tl2+ simultaneously with that of Eu2+, revealing their intrinsic association. Similar formation of Tl2+ was not observed in other rare earth salts, implying that the stability of the half-filled electronic configuration of Eu2+ may be responsible for the stabilization of Tl2+. Their relaxation back to Eu3+ and Tl+ simultaneously at 255 K gives further confirmation of their association and suggests that the matrix intrinsically does not favor the stabilization of Eu2+ as reported in a number of other matrices. The hyperfine coupling constant for Tl2+ was calculated using the Breit-Rabi equation and was found to be 80 GHz. 相似文献
74.
Determination of metallic impurities in U3O8 using energy dispersive X-ray fluorescence spectrometry
V. Natarajan B.A. DhawaleB. Rajeswari N.S. HonS.K. Thulasidas N.K. PorwalS.V. Godbole V.K. Manchanda 《Spectrochimica Acta Part B: Atomic Spectroscopy》2008
In order to examine the capability of energy dispersive X-ray fluorescence spectrometry for the determination of some common metallic impurities in nuclear grade U3O8 matrix, a series of synthetic U3O8 standards, containing impurities such as Ca, Co, Cr, Cu, Fe, Mn, Mo, Ni ,V, W and Zn in the concentration range, 100–1000 μg/g, were prepared. Using these standards, calibration curves were set up for different elements after optimizing the spectrometer parameters. Two synthetic samples and five reference standards obtained through an inter-laboratory comparison exercise within analytical laboratories of Department of Atomic Energy, India were analyzed to evaluate the performance of the newly developed analytical methods. The estimates for most of the analytes were in good agreement with the added amounts. The method is fast, since it requires no chemical treatment. The method has good precision for the analytes determined. 相似文献
75.
Rohini M. Godbole 《Pramana》2007,69(6):1215-1219
This talk will consist of a set of personal remarks giving my impressions of the International Workshop on Linear Colliders
(LCWS06) and a theorist’s perspective.
相似文献
76.
Dilip Kumar Ghosh Rohini M. Godbole Sreerup Raychaudhuri 《Zeitschrift fur Physik C Particles and Fields》1997,75(2):357-365
We investigate the possibility that the excess of four-jet events in e + e ? collisions at LEP-1.5 which has been reported by the ALEPH Collaboration could be due to the production of charginos or neutralinos, followed by their decay into quark jets through baryon number-violating (λ″) couplings. An estimate at the parton level shows, however, that these events cannot be due to neutralinos because of the low cross-section, and is unlikely to be due to the production of chargino pairs because of the largely different event shapes. 相似文献
77.
R. M. Godbole 《Pramana》1998,51(1-2):217-228
After giving a very brief introduction to the resolved photon processes, I will summarize the latest experimental information
from HERA, on resolved photon contribution to largep
T jet production as well as to direct photon production. I will point out the interesting role that resolved photon processes
can play in increasing our understanding of the dynamics of the quarkonium production. I will then discuss the newer information
on the parton content of virtual photons as well as thek
T distribution of the partons in the photon. I will end by giving predictions of an eikonalized minijet model for σ
γγ
inel
which crucially uses the experimental measurement of the abovementionedk
T distribution and comparing them with data.
On leave of absence from Department of Physics, University of Bombay, Mumbai 400 076, India 相似文献
78.
We review high-energy scattering processes that are sensitive to the hadronic structure of the photon, describing theoretical
predictions as well as recent experimental results. These processes include deep-inelastic electron-photon scattering ate
+
e
− colliders; and the production of jets, heavy quarks and isolated photons in the collision of real photons ate
+
e
− colliders, as well as in photon-photon collisions atep colliders. We also comment on minijet based calculations of totalγp andγγ cross-sections, and discuss the possibility that future lineare
+
e
− colliders might produce very large photon fluxes due to the beamstrahlung phenomenon; in the most extreme cases, we predict
more than one hadronicγγ event to occur at every bunch crossing. 相似文献
79.
80.
A. P. Godbole M. V. Koutras F. S. Milienos 《Annals of the Institute of Statistical Mathematics》2011,63(3):559-584
A k × n array with entries from a q-letter alphabet is called a t-covering array if each t × n submatrix contains amongst its columns each one of the q
t
different words of length t that can be produced by the q letters. In the present article we use a probabilistic approach based on an appropriate Markov chain embedding technique,
to study a t-covering problem where, instead of looking at all possible t × n submatrices, we consider only submatrices of dimension t × n with its rows being consecutive rows of the original k × n array. Moreover, an exact formula is established for the probability distribution function of the random variable, which
enumerates the number of deficient submatrices (i.e., submatrices with at least one missing word, amongst their columns),
in the case of a k × n binary matrix (q = 2) obtained by realizing kn Bernoulli variables. 相似文献