全文获取类型
收费全文 | 1016篇 |
免费 | 26篇 |
国内免费 | 6篇 |
专业分类
化学 | 713篇 |
晶体学 | 6篇 |
力学 | 24篇 |
数学 | 120篇 |
物理学 | 185篇 |
出版年
2022年 | 15篇 |
2021年 | 12篇 |
2020年 | 17篇 |
2019年 | 22篇 |
2018年 | 15篇 |
2017年 | 11篇 |
2016年 | 28篇 |
2015年 | 23篇 |
2014年 | 24篇 |
2013年 | 70篇 |
2012年 | 55篇 |
2011年 | 59篇 |
2010年 | 33篇 |
2009年 | 39篇 |
2008年 | 58篇 |
2007年 | 42篇 |
2006年 | 41篇 |
2005年 | 36篇 |
2004年 | 38篇 |
2003年 | 30篇 |
2002年 | 31篇 |
2001年 | 15篇 |
2000年 | 19篇 |
1999年 | 11篇 |
1998年 | 13篇 |
1997年 | 13篇 |
1995年 | 11篇 |
1994年 | 18篇 |
1993年 | 13篇 |
1992年 | 11篇 |
1991年 | 7篇 |
1990年 | 7篇 |
1989年 | 7篇 |
1988年 | 13篇 |
1987年 | 9篇 |
1986年 | 7篇 |
1985年 | 12篇 |
1984年 | 11篇 |
1983年 | 8篇 |
1982年 | 7篇 |
1981年 | 12篇 |
1980年 | 6篇 |
1979年 | 15篇 |
1978年 | 8篇 |
1977年 | 12篇 |
1976年 | 7篇 |
1975年 | 13篇 |
1974年 | 7篇 |
1973年 | 7篇 |
1969年 | 6篇 |
排序方式: 共有1048条查询结果,搜索用时 15 毫秒
61.
Deepa Sathian Rupali Rohatgi V. Jayalakshmi P. K. Marathe Sarala Nair R. V. Kolekar G. Chourasiya S. Kannan 《Indian Journal of Physics》2009,83(6):863-869
CR-39 Solid State Nuclear Track Detecting foils (SSNTD), along with 1 mm thick polyethylene radiator, sealed in triple laminated
pouches, are used for country wide Fast Neutron Personnel Monitoring in India. With the present system of processing by elevated
temperature electrochemical etching (ETECE) and evaluation using automatic image analysis, only 16 foils are processed at
a time and it is useful over the dose equivalent range 0.2 mSv to 10 mSv. It has been reported that, by processing CR-39 of
good detection efficiency by chemical etching at elevated temperature, more numbers of foils can be processed simultaneously.
In the present study, CR-39 foils from Pershore Moulding (UK) have been chemically etched using 7 N KOH under various conditions
of temperature and etching durations and evaluated using high magnification microscope. The duration of chemical etching,
has been optimized at a constant temperature of 60°C for chemical etching process. The characteristics of the chemically etched
CR-39 foils are compared with the characteristics of the CR-39 foils processed by the existing system of ETECE and the detailed
results are presented in the full text of the paper. It has been observed that by chemical etching process, the dose equivalent
range of CR-39 foils can be extended above 60 mSv.
相似文献
62.
Guy Patchornik Irishi N.N. NamboothiriDivya K. Nair Ellen WachtelSidney R. Cohen Noga FriedmanMordechai Sheves 《Journal of colloid and interface science》2012,388(1):300-305
A strategy for clustering of native lipid membranes is presented. It relies on the formation of complexes between hydrophobic chelators embedded within the lipid bilayer and metal cations in the aqueous phase, capable of binding two (or more) chelators simultaneously Fig. 1. We used this approach with purple membranes containing the light driven proton pump protein bacteriorhodopsin (bR) and showed that patches of purple membranes cluster into mm sized aggregates and that these are stable for months when incubated at 19 °C in the dark. The strategy may be general since four different hydrophobic chelators (1,10-phenanthroline, bathophenanthroline, Phen-C10, and 8-hydroxyquinoline) and various divalent cations (Ni2+, Zn2+, Cd2+, Mn2+, and Cu2+) induced formation of membrane clusters. Moreover, the absolute requirement for a hydrophobic chelator and the appropriate metal cations was demonstrated with light and atomic force microscopy (AFM); the presence of the metal does not appear to affect the functional state of the protein. The potential utility of the approach as an alternative to assembled lipid bilayers is suggested. 相似文献
63.
[reaction: see text]. A facile one-pot synthesis of 1-amino-4-aryl-tetralin derivatives by the CAN-induced cyclodimerization of various styrenes in acetonitrile and acrylonitrile is described. 相似文献
64.
Suppose denote the ergodic averages for the natural numbers . Let denote the corresponding maximal function and let for . We show that for if there exists such that then there exists such that . Similar weak (1,1) inequalities follow for V
q
when you know them for M too also with q > 1. We also show this fails completely if q= 1. We also show that for certain polynomial like and random sequences , if
and
is of exponential growth then
for a certain positive constant C.
(Received 11 February 1998; in revised form 10 December 1998) 相似文献
65.
We consider the problem of the identification of continuous functionsf∶[0, 1]→R, by means of the sums
. This is not possible, in general, but we prove that it may be the case under auxiliary conditions. We also study the behaviour
of a well known exceptional function.
Sunto Consideriamo il problema dell’identificazione delle funzioni continuef:[0,1]→ →R, mediante le somme . Ciò non è, in generale, possibile: dimostriamo però tale possibilità sotto condizioni ausiliarie. Studiamo inoltre il comportamento di una ben nota funzione eccezionale.相似文献
66.
67.
Utility of Zeo-Karb 226 and Dowex A-l for the separation of Tl and In at 5-ppm level from high-purity zinc and zinc-base alloys has been investigated. With Zeo-Karb 226 (NH(4)(+)), T1(+) is conveniently separated from these materials and also from many other cations, with l.0M ammonium nitrate as the eluent. It is subsequently determined with Rhodamine B. This separation principle is also applied to the analysis of Pb-Tl alloys. Both Tl and In (along with Fe) are preconcentrated on Zeo-Karb 226(H(+)) from a solution of the sample at pH 3.0. Suitable methods of subsequent determination of Tl and In are described. In the case of Dowex A-1(H(+)), Tl(+), In(3+), Fe(3+) and Cu(2+) are retained from a solution of the sample at pH 2.0. An o-phenanthroline solution at pH 2.0 elutes all but traces of Cu(2+). In(3+) along with Fe(3+) is eluted with l.0M hydrochloric acid. Finally, Tl is eluted with 2.0M hydrochloric acid containing sulphurous acid. 相似文献
68.
The stability of a curved rail under a constant moving load has been investigated using a linear theory; critical speeds of the moving load, and the dynamic rail deflections and rotation were calculated. The effect of the foundation was included through distributed linear springs. It was assumed that the moving load remains in constant contact with the rail and travels along a fixed path on the rail head. 相似文献
69.
[reaction: see text] The pyridine-mediated reaction of dimethyl acetylenedicarboxylate and cyclobutene-1,2-diones affords selective access to either hexasubstituted benzene derivatives or cyclopentenedione derivatives depending on the concentration of pyridine. 相似文献
70.
[reaction: see text] Pyridine catalyzes the reaction of 1,2-diaryl diones with dimethyl butynedioate to afford diaroyl maleates. This unprecedented rearrangement involves a unique benzoyl migration and proceeds with complete stereoselectivity. 相似文献