全文获取类型
收费全文 | 9607篇 |
免费 | 1574篇 |
国内免费 | 2372篇 |
专业分类
化学 | 4822篇 |
晶体学 | 34篇 |
力学 | 1335篇 |
综合类 | 41篇 |
数学 | 2349篇 |
物理学 | 4972篇 |
出版年
2023年 | 164篇 |
2022年 | 165篇 |
2021年 | 137篇 |
2020年 | 132篇 |
2019年 | 116篇 |
2018年 | 180篇 |
2017年 | 77篇 |
2016年 | 182篇 |
2015年 | 211篇 |
2014年 | 355篇 |
2013年 | 314篇 |
2012年 | 487篇 |
2011年 | 497篇 |
2010年 | 397篇 |
2009年 | 300篇 |
2008年 | 303篇 |
2007年 | 555篇 |
2006年 | 537篇 |
2005年 | 647篇 |
2004年 | 575篇 |
2003年 | 392篇 |
2002年 | 484篇 |
2001年 | 551篇 |
2000年 | 442篇 |
1999年 | 514篇 |
1998年 | 227篇 |
1997年 | 147篇 |
1996年 | 206篇 |
1995年 | 273篇 |
1994年 | 229篇 |
1993年 | 242篇 |
1992年 | 226篇 |
1991年 | 161篇 |
1990年 | 198篇 |
1989年 | 197篇 |
1988年 | 222篇 |
1987年 | 230篇 |
1986年 | 194篇 |
1985年 | 264篇 |
1984年 | 171篇 |
1983年 | 114篇 |
1982年 | 107篇 |
1981年 | 90篇 |
1975年 | 116篇 |
1959年 | 83篇 |
1958年 | 125篇 |
1957年 | 123篇 |
1956年 | 109篇 |
1955年 | 118篇 |
1954年 | 90篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
依据反射或检基原理,本文提出用于截尾资料的两样本队列半数生存期(CHL)检验.两样本合并CHL经指数内插取自Kaplan-Meier或Berkson-Gage估计值.连续性校正,经以有效样本容量取代样本容量,扩展自Yates校正.合并标准误来自同源性生存率方差估计值,后者经有效样本容量扩展自二项分布方差.无截尾时,这些统计量还原为经典中位数检验.与反射统计量相比,检基统计量具有更高的功效.附有工作实例描述其临床应用. 相似文献
122.
I.TntroductionStatisticalandneuralnetworkmcthodsforpatternclassiflcationusesignificantlydifTerentapproachesintrainingaclassificr.Inthestatistica1approach,thcformationofaclassifier1arge1ydependsonthestatisticsofthetrainingpatternsand,insomecases,theassumptionsaboutthedistributionofthepopulation.Theneuralnetworkmethodisnon-parametricandcanbeadaptivcinthetrainingprocessl'l.Becauseofitssimplicityandflexibility,theneuralnetworkhasbecnincreasing1yusedforpatternclassiflcation.Itisnowwe11knownthatan… 相似文献
123.
P.Sablonniere 《分析论及其应用》1992,(3)
Suppose that we want to approximate fC[0,1]by polynomials in P_n,using only itsvalues on X_n={i/n,0≤i≤n}.This can be done by the Lagrange interpolant L_n f or theclassical Bernstein polynomial B_n f.But,when n tends to infinity,L_n f does not converge to fin general and the convergence of B_n f to fis very slow.We define a family of operators B~(k)_n,n≥k,which are intermediate ones between B(0)_n=B~(1)_n=B_n and B~(n)_n=L_n,and we studysome of their properties.In particular,we prove a Voronovskaja-type theorem which assertsthat B~(k)_n f-f=0(n~(-[(k+2)/2))for f sufficiently regular.Moreover,B(k)_n f uses only values of B_n f and its derivaties and can be computed by DeCasteljau or subdivision algorithms. 相似文献
124.
Studies on the properties of flow-induced oscillation and sound radiation in streamlined protuberant special cavities 总被引:1,自引:0,他引:1
I.IntroductionAsanuidpassingthroughthecavityatcertainflowrate,themediuminthemouthandthccavityisoscillatingandsoundisradiated.Noton1ystochasticturbu1encenoiscispossi-blyproducedbutsinglefrequencysoundofspecia1lydesignatedpitchisalsoproduced.Andthusthespcctrumofthcradiatedsoundisshownascontinuousspectrumandcharacteristiclinespcctrum.Inthiscascwcmaycallitflow-inducedosci1lation.Flow-inducedoscillationandsoundradiationcanbeproducedasafluid(waterorgas)passingthroughthecavitybysinkingcavityunderint… 相似文献
125.
A sufficient condition for the order of approximation of a continuous 2π periodic function with a givenmajorant for the modulus of continuity by the [F, d_n] means of its Fourier serier to be of Jackson order isobtained. This sufficient condition is shown to be not enough for the order of approximation by partial sums oftheir Fourier series to be of Jackson order. The error estimate is shown to be the best possible. 相似文献
126.
127.
The reference [4] proved the consistency of S1 and S2 among Lewis' five strict implication systems in the modal logic by using the method of the Boolean-valued model. But, in this method, the consistency of S3, S4 and S5 in Lewis' five strict implication systems is not decided. This paper makes use of the properties: (1) the equivalence of the modal systems S3 and P3, S4 and P4; (2) the modal systems P3 and P4 all contained the modal axiom T(□p → p); (3) the modal axiom T is correspondence to the reflexive property in VB. Hence, the paper proves: (a) ‖As31‖ = 1; (b) ‖AS41‖ = 1; (c) ‖AS5l‖ = 1 in the model (where B is a complete Boolean algebra, R is reflexive property in VB). Therefore, the paper finally proves that the Boolean-valued model VB of the ZFC axiom system in set theory is also a Boolean-valued model of Lewis' the strict implication system S3, S4 and S5. 相似文献
128.
§1 IntroductionAt present,boundary value problems (BVPs) are widely investigated with variousmethods and techniques. BVPs with integral boundary conditions constitute a veryinteresting class of problems such as multipoint,three-point,four-point and nonlocalboundary value problems which are considered by many authors.And the existence ofpositive solutions for these problems becomes the subjectof many papers[1—6] .In a recentpaper[7] ,the authors have studied the existence of positive solut… 相似文献
129.
The present paper establishes sufficient conditions for the uniformly bounded of any solution of (1.1) and which tend to zero as t → ∞. 相似文献
130.
M.I.Gil' 《Annals of Differential Equations》2004,20(2):145-154
The nonlocal initial problem for nonlinear nonautonomous evolution equati-ons in a Banach space is considered. It is assumed that the nonlinearities havethe local Lipschitz properties. The existence and uniqueness of mild solutionsare proved. Applications to integro-differential equations are discussed.The main tool in the paper is the normalizing mapping (the generalizednorm). 相似文献