全文获取类型
收费全文 | 309篇 |
免费 | 14篇 |
专业分类
化学 | 149篇 |
晶体学 | 1篇 |
力学 | 6篇 |
数学 | 14篇 |
物理学 | 153篇 |
出版年
2023年 | 2篇 |
2022年 | 3篇 |
2021年 | 2篇 |
2020年 | 2篇 |
2019年 | 4篇 |
2018年 | 5篇 |
2016年 | 3篇 |
2015年 | 9篇 |
2014年 | 10篇 |
2013年 | 5篇 |
2012年 | 13篇 |
2011年 | 10篇 |
2010年 | 7篇 |
2009年 | 6篇 |
2008年 | 16篇 |
2007年 | 16篇 |
2006年 | 19篇 |
2005年 | 19篇 |
2004年 | 11篇 |
2003年 | 17篇 |
2002年 | 12篇 |
2001年 | 9篇 |
2000年 | 9篇 |
1996年 | 6篇 |
1995年 | 9篇 |
1994年 | 9篇 |
1993年 | 5篇 |
1992年 | 19篇 |
1991年 | 7篇 |
1990年 | 5篇 |
1989年 | 2篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1986年 | 9篇 |
1983年 | 3篇 |
1981年 | 2篇 |
1979年 | 3篇 |
1978年 | 5篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1973年 | 2篇 |
1970年 | 1篇 |
1968年 | 1篇 |
1966年 | 1篇 |
1964年 | 1篇 |
1963年 | 1篇 |
1939年 | 1篇 |
1932年 | 1篇 |
1897年 | 2篇 |
1893年 | 1篇 |
排序方式: 共有323条查询结果,搜索用时 78 毫秒
91.
Adler SS Afanasiev S Aidala C Ajitanand NN Akiba Y Alexander J Amirikas R Aphecetche L Aronson SH Averbeck R Awes TC Azmoun R Babintsev V Baldisseri A Barish KN Barnes PD Bassalleck B Bathe S Batsouli S Baublis V Bazilevsky A Belikov S Berdnikov Y Bhagavatula S Boissevain JG Borel H Borenstein S Brooks ML Brown DS Bruner N Bucher D Buesching H Bumazhnov V Bunce G Burward-Hoy JM Butsyk S Camard X Chai JS Chand P Chang WC Chernichenko S Chi CY Chiba J Chiu M Choi IJ Choi J Choudhury RK Chujo T 《Physical review letters》2003,91(7):072301
Transverse momentum spectra of neutral pions in the range 1
相似文献
92.
Adler SS Afanasiev S Aidala C Ajitanand NN Akiba Y Alexander J Amirikas R Aphecetche L Aronson SH Averbeck R Awes TC Azmoun R Babintsev V Baldisseri A Barish KN Barnes PD Bassalleck B Bathe S Batsouli S Baublis V Bazilevsky A Belikov S Berdnikov Y Bhagavatula S Boissevain JG Borel H Borenstein S Brooks ML Brown DS Bruner N Bucher D Buesching H Bumazhnov V Bunce G Burward-Hoy JM Butsyk S Camard X Chai JS Chand P Chang WC Chernichenko S Chi CY Chiba J Chiu M Choi IJ Choi J Choudhury RK Chujo T 《Physical review letters》2005,94(8):082301
The PHENIX experiment has measured midrapidity transverse momentum spectra (0.4
相似文献
93.
The reaction of benzaldehyde with excess pyrrole at room temperature in the absence of solvent affords a mixture of meso-substituted polypyrranes species. After separation by column chromatography, these may be used to prepare a range of calix[4]phyrin macrocycles by condensation with acetone under conditions of acid catalysis. 相似文献
94.
95.
E. Bucher J. P. Maita G. W. Hull Jr. L. D. Longinotti B. Lüthi P. S. Wang 《Zeitschrift für Physik B Condensed Matter》1976,25(1):41-48
We have investigated elastic, magnetic, thermal and structural properties of systems which exhibit induced magnetic behavior (TbP, PrSn3, Pr3Se4, Pr3Te4). Particular emphasis is given to phonon effects due to the crystalline electric field, phase transitions, and magnetic fields. TbP has a first order magnetic phase transition and both TbP, PrSn3 show a temperature dependence of the elastic constants, which can be explained with the known crystal field level scheme. The compounds Pr3S4, La3S4, Pr3Se4 exhibit structural instabilities at much higher temperatures than the magnetic or superconducting transition temperatures. Pr3Te4 does not exhibit a structural transition, but a strong elastic softening in a magnetic field. This effect is due to strong field dependent quadrupole transitions. All these systems are analyzed with respect to typical induced moment parameters. 相似文献
96.
E. Bucher 《Applied Physics A: Materials Science & Processing》1978,17(1):1-26
Parameters such as the energy gapE
g
, open circuit voltageV
oc
, short circuit current densityj
sc
, fill factor F.F., efficiency η, antireflection coating condition A.R. and illumination conditions of currently known photovoltaic
diodes are reviewed and tabulated, followed by some critical comments. 相似文献
97.
Sm4Bi3 has the anti-Th3P4 (cubic) structure with three Sm2+ ions and one Sm3+ ion. The compound undergoes a first-order, isostructural transition at about 26 kbar. The resistance abruptly decreases by a factor of three and the volume by about 10%. The Sm2+ ions undergo a change towards the 3+ state in the transition and the material goes from semimetallic to a metallic state. The behavior of the resistance anomaly suggests termination of the phase boundary at a critical point. 相似文献
98.
J. Sierro E. Bucher L.D. Longinotti H. Takayama P. Fulde 《Solid State Communications》1975,17(1):79-81
We report here strong thermopower anomalies in two Van Vleck paramagnets TmCd and PrPb3, due to crystal field levels. The results can only be understood on the basis of electron-ion interactions involving orbital degrees of freedom, and therefore differ markedly from the dilute alloy case. 相似文献
99.
The electric field gradient eq at Os nuclei in Os and Re single crystals has been determined by Mössbauer transmission experiments with the 137 keV resonance in 186Os as -4.5 (3) × 1017 V/cm2 and - 3.8 (3) × 1017 V/cm2, respectively. 相似文献
100.
Adcox K Adler SS Ajitanand NN Akiba Y Alexander J Aphecetche L Arai Y Aronson SH Averbeck R Awes TC Barish KN Barnes PD Barrette J Bassalleck B Bathe S Baublis V Bazilevsky A Belikov S Bellaiche FG Belyaev ST Bennett MJ Berdnikov Y Botelho S Brooks ML Brown DS Bruner N Bucher D Buesching H Bumazhnov V Bunce G Burward-Hoy J Butsyk S Carey TA Chand P Chang J Chang WC Chavez LL Chernichenko S Chi CY Chiba J Chiu M Choudhury RK Christ T Chujo T Chung MS Chung P Cianciolo V Cole BA D'Enterria DG 《Physical review letters》2001,86(16):3500-3505
We present results for the charged-particle multiplicity distribution at midrapidity in Au-Au collisions at square root of [s(NN)] = 130 GeV measured with the PHENIX detector at RHIC. For the 5% most central collisions we find dN(ch)/d eta(vertical line eta = 0) = 622+/-1(stat)+/-41(syst). The results, analyzed as a function of centrality, show a steady rise of the particle density per participating nucleon with centrality. 相似文献