全文获取类型
收费全文 | 732篇 |
免费 | 25篇 |
国内免费 | 11篇 |
专业分类
化学 | 498篇 |
力学 | 15篇 |
数学 | 112篇 |
物理学 | 143篇 |
出版年
2023年 | 3篇 |
2022年 | 3篇 |
2021年 | 16篇 |
2020年 | 18篇 |
2019年 | 11篇 |
2018年 | 7篇 |
2017年 | 9篇 |
2016年 | 14篇 |
2015年 | 16篇 |
2014年 | 27篇 |
2013年 | 48篇 |
2012年 | 47篇 |
2011年 | 45篇 |
2010年 | 22篇 |
2009年 | 30篇 |
2008年 | 28篇 |
2007年 | 49篇 |
2006年 | 32篇 |
2005年 | 42篇 |
2004年 | 44篇 |
2003年 | 35篇 |
2002年 | 29篇 |
2001年 | 23篇 |
2000年 | 16篇 |
1999年 | 15篇 |
1998年 | 10篇 |
1997年 | 11篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1994年 | 8篇 |
1993年 | 6篇 |
1992年 | 10篇 |
1991年 | 7篇 |
1990年 | 15篇 |
1989年 | 3篇 |
1988年 | 14篇 |
1987年 | 8篇 |
1986年 | 11篇 |
1985年 | 4篇 |
1984年 | 8篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 3篇 |
1973年 | 1篇 |
1968年 | 1篇 |
1908年 | 1篇 |
排序方式: 共有768条查询结果,搜索用时 31 毫秒
731.
732.
Adams J Adler C Aggarwal MM Ahammed Z Amonett J Anderson BD Anderson M Arkhipkin D Averichev GS Badyal SK Balewski J Barannikova O Barnby LS Baudot J Bekele S Belaga VV Bellwied R Berger J Bezverkhny BI Bhardwaj S Bhaskar P Bhati AK Bichsel H Billmeier A Bland LC Blyth CO Bonner BE Botje M Boucham A Brandin A Bravar A Cadman RV Cai XZ Caines H Calderón de la Barca Sánchez M Carroll J Castillo J Castro M Cebra D Chaloupka P Chattopadhyay S Chen HF Chen Y Chernenko SP Cherney M Chikanian A Choi B 《Physical review letters》2003,91(7):072304
We report measurements of single-particle inclusive spectra and two-particle azimuthal distributions of charged hadrons at high transverse momentum (high p(T)) in minimum bias and central d+Au collisions at sqrt[s(NN)]=200 GeV. The inclusive yield is enhanced in d+Au collisions relative to binary-scaled p+p collisions, while the two-particle azimuthal distributions are very similar to those observed in p+p collisions. These results demonstrate that the strong suppression of the inclusive yield and back-to-back correlations at high p(T) previously observed in central Au+Au collisions are due to final-state interactions with the dense medium generated in such collisions. 相似文献
733.
Adler C Ahammed Z Allgower C Amonett J Anderson BD Anderson M Averichev GS Balewski J Barannikova O Barnby LS Baudot J Bekele S Belaga VV Bellwied R Berger J Bichsel H Billmeier A Bland LC Blyth CO Bonner BE Boucham A Brandin A Bravar A Cadman RV Caines H Calderón De La Barca Sánchez M Cardenas A Carroll J Castillo J Castro M Cebra D Chaloupka P Chattopadhyay S Chen Y Chernenko SP Cherney M Chikanian A Choi B Christie W Coffin JP Cormier TM Cramer JG Crawford HJ Deng WS Derevschikov AA 《Physical review letters》2003,90(3):032301
Azimuthal anisotropy (v(2)) and two-particle angular correlations of high p(T) charged hadrons have been measured in Au+Au collisions at sqrt[s(NN)]=130 GeV for transverse momenta up to 6 GeV/c, where hard processes are expected to contribute significantly. The two-particle angular correlations exhibit elliptic flow and a structure suggestive of fragmentation of high p(T) partons. The monotonic rise of v(2)(p(T)) for p(T)<2 GeV/c is consistent with collective hydrodynamical flow calculations. At p(T)>3 GeV/c, a saturation of v(2) is observed which persists up to p(T)=6 GeV/c. 相似文献
734.
Ackermann KH Adams N Adler C Ahammed Z Ahmad S Allgower C Amsbaugh J Anderson M Anderssen E Arnesen H Arnold L Averichev GS Baldwin A Balewski J Barannikova O Barnby LS Baudot J Beddo M Bekele S Belaga VV Bellwied R Bennett S Bercovitz J Berger J Betts W Bichsel H Bieser F Bland LC Bloomer M Blyth CO Boehm J Bonner BE Bonnet D Bossingham R Botlo M Boucham A Bouillo N Bouvier S Bradley K Brady FP Braithwaite ES Braithwaite W Brandin A Brown RL Brugalette G Byrd C Caines H 《Physical review letters》2001,86(3):402-407
Elliptic flow from nuclear collisions is a hadronic observable sensitive to the early stages of system evolution. We report first results on elliptic flow of charged particles at midrapidity in Au+Au collisions at square root(S)NN = 130 GeV using the STAR Time Projection Chamber at the Relativistic Heavy Ion Collider. The elliptic flow signal, v2, averaged over transverse momentum, reaches values of about 6% for relatively peripheral collisions and decreases for the more central collisions. This can be interpreted as the observation of a higher degree of thermalization than at lower collision energies. Pseudorapidity and transverse momentum dependence of elliptic flow are also presented. 相似文献
735.
Adler C Ahammed Z Allgower C Amonett J Anderson BD Anderson M Averichev GS Balewski J Barannikova O Barnby LS Baudot J Bekele S Belaga VV Bellwied R Berger J Bichsel H Bland LC Blyth CO Bonner BE Bossingham R Boucham A Brandin A Caines H Calderón De La Barca Sánchez M Cardenas A Carroll J Castillo J Castro M Cebra D Chattopadhyay S Chen ML Chen Y Chernenko SP Cherney M Chikanian A Choi B Christie W Coffin JP Conin L Cormier TM Cramer JG Crawford HJ DeMello M Deng WS Derevschikov AA Didenko L 《Physical review letters》2001,87(11):112303
The minimum-bias multiplicity distribution and the transverse momentum and pseudorapidity distributions for central collisions have been measured for negative hadrons ( h(-)) in Au+Au interactions at square root of ([s(NN)]) = 130 GeV. The multiplicity density at midrapidity for the 5% most central interactions is dN(h(-))/d(eta)/(eta = 0) = 280+/-1(stat)+/-20(syst), an increase per participant of 38% relative to pp collisions at the same energy. The mean transverse momentum is 0.508+/-0.012 GeV/c and is larger than in central Pb+Pb collisions at lower energies. The scaling of the h(-) yield per participant is a strong function of p( perpendicular). The pseudorapidity distribution is almost constant within /eta/<1. 相似文献
736.
737.
A case of a child with a rare giant congenital cavernous lymphangioma giving rise to elephantiasis of the left lower extremity is presented. Plain radiographs revealed underlying bone lesions and magnetic resonance (MR) imaging accurately defined extension of the process into the pelvis and retroperitoneum. 相似文献
738.
G. F. Torres del Castillo 《International Journal of Theoretical Physics》1986,25(8):883-890
It is shown that under certain weak conditions (the vanishing of the field strength along a family of self-dual or anti-self-dual geodesic two-surfaces), in a curved or flat space-time, the linear perturbations of a given gauge field configuration can be expressed in terms of the solutions of a single second-order linear partial differential equation for a matrix potential. The particular case of the self-dual gauge fields is treated in some detail. 相似文献
739.
This paper is concerned with the maximum likelihood estimation problem for the singly truncated normal family of distributions. Necessary and suficient conditions, in terms of the coefficient of variation, are provided in order to obtain a solution to the likelihood equations. Furthermore, the maximum likelihood estimator is obtained as a limit case when the likelihood equation has no solution. 相似文献
740.
J. R. Castillo J. M. Mir C. Martinez M. T. Gomez 《Fresenius' Journal of Analytical Chemistry》1986,325(2):171-174
Summary Optimum for the generation of arsine from As(III) and (V) in a generating system without carrier gas and with atomization in an air-acetylene flame were established. A 3% solution of NaBH4 was used as reducer. The effect of 26 different species on the determination of arsenic was studied. The method has been applied to determine arsenic in copper.A linear relationship exists between 0.5 and 3 g for As(III) and between 1 and 4 total g of As(V). The sensitivity, expressed as the slope of the calibration curve is 0.067 g–1 for As(III) and 0.054 g–1 for As(V); the characteristic masses are 1.22 g and 0.44 g, and the limits of detection 0.27 g and 0.33 g, respectively.
This work has been sponsored by the CAICYT (project 3378/83) of the Spanish Education and Science Department. 相似文献
Direkte Flammen-AAS — Erzeugung flüchtiger kovalenter HydrideStörungen durch das Verhältnis der As(III/V)-Valenzstufen und Arsenbestimmung in Kupfer
Zusammenfassung Optimale Bedingungen wurden ausgearbeitet für die Arsinerzeugung aus As(III) und As(V) in einem System ohne Trägergas mit Atomisierung in einer Luft-Acetylen-Flamme. Zur Reduktion dient eine 3%ige NaBH4-Lösung. Der Einfluß von 26 Fremdionen wurde geprüft und das Verfahren zur Arsenbestimmung in Kupfer angewendet. Eine lineare Beziehung ergab sich für 0,5–3 g As(III) und 1–4 g As(V). Die Empfindlichkeit (als Neigung der Eichkurve) beträgt 0,067 g–1 für As(III) und 0,054 g–1 für As(V). Die charakteristischen Massen sind 1,22 g bzw. 0,44 g und die Nachweisgrenzen 0,27 g bzw. 0,33 g.
This work has been sponsored by the CAICYT (project 3378/83) of the Spanish Education and Science Department. 相似文献