全文获取类型
收费全文 | 505篇 |
免费 | 11篇 |
国内免费 | 1篇 |
专业分类
化学 | 349篇 |
晶体学 | 3篇 |
力学 | 10篇 |
数学 | 88篇 |
物理学 | 67篇 |
出版年
2023年 | 3篇 |
2022年 | 4篇 |
2021年 | 4篇 |
2020年 | 8篇 |
2019年 | 6篇 |
2018年 | 4篇 |
2017年 | 9篇 |
2016年 | 12篇 |
2015年 | 9篇 |
2014年 | 8篇 |
2013年 | 27篇 |
2012年 | 30篇 |
2011年 | 34篇 |
2010年 | 22篇 |
2009年 | 14篇 |
2008年 | 28篇 |
2007年 | 20篇 |
2006年 | 26篇 |
2005年 | 23篇 |
2004年 | 25篇 |
2003年 | 20篇 |
2002年 | 31篇 |
2001年 | 7篇 |
2000年 | 5篇 |
1999年 | 3篇 |
1998年 | 5篇 |
1997年 | 7篇 |
1996年 | 4篇 |
1995年 | 4篇 |
1993年 | 8篇 |
1992年 | 5篇 |
1991年 | 6篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1986年 | 6篇 |
1984年 | 7篇 |
1983年 | 7篇 |
1982年 | 5篇 |
1981年 | 6篇 |
1980年 | 6篇 |
1979年 | 8篇 |
1977年 | 4篇 |
1973年 | 2篇 |
1971年 | 2篇 |
1967年 | 3篇 |
1964年 | 4篇 |
1963年 | 2篇 |
1959年 | 4篇 |
1943年 | 3篇 |
1928年 | 2篇 |
排序方式: 共有517条查询结果,搜索用时 343 毫秒
511.
George C. Bourantas Benjamin F. Zwick Theo Philippe Lavier Vassilios C. Loukopoulos Athanassios A. Dimas Adam Wittek Karol Miller 《国际流体数值方法杂志》2023,95(1):143-175
We present a strong form meshless solver for numerical solution of the nonstationary, incompressible, viscous Navier–Stokes equations in two (2D) and three dimensions (3D). We solve the flow equations in their stream function-vorticity (in 2D) and vector potential-vorticity (in 3D) formulation, by extending to 3D flows the boundary condition-enforced immersed boundary method, originally introduced in the literature for 2D problems. We use a Cartesian grid, uniform or locally refined, to discretize the spatial domain. We apply an explicit time integration scheme to update the transient vorticity equations, and we solve the Poisson type equation for the stream function or vector potential field using the meshless point collocation method. Spatial derivatives of the unknown field functions are computed using the discretization-corrected particle strength exchange method. We verify the accuracy of the proposed numerical scheme through commonly used benchmark and example problems. Excellent agreement with the data from the literature was achieved. The proposed method was shown to be very efficient, having relatively large critical time steps. 相似文献
512.
513.
514.
Theo Fromme Lucie K. Tintrop Dr. Sven Reichenberger Prof. Dr. Torsten C. Schmidt Prof. Dr. Stephan Barcikowski 《Chemphyschem》2023,24(11):e202300089
Laser ablation in liquids has been established as a scalable preparation method of nanoparticles for various applications. Particularly for materials prone to oxidation, it is established to suppress oxidation by using organic solvents as a liquid medium. While this often functionalizes the nanoparticles with a carbon shell, the related chemical processes that result from laser-induced decomposition reactions of the organic solvents remain uncertain. Using a systematic series of C6 solvents complemented by n-pentane and n-heptane during the nanosecond laser ablation of gold, the present study focuses on the solvent-dependent influence on gas formation rates, nanoparticle productivity, and gas composition. Both the permanent gas and hydrogen formation was found to be linearly correlated with ablation rate, ΔHvap, and pyrolysis activation energy. Based on this, a decomposition pathway linked to pyrolysis is proposed allowing the deduction of first selection rules for solvents that influence the formation of carbon or permanent gases. 相似文献
515.
Ralph J.S. van Mechelen Jarno E.J. Wolters Sebastian Fredrich Christian J.F. Bertens Marion J.J. Gijbels Albert P.H.J. Schenning Leonard Pinchuk Theo G.M.F. Gorgels Henny J.M. Beckers 《Macromolecular bioscience》2023,23(10):2300075
Fibrosis of the filtering bleb is one of the main causes of failure after bleb-forming glaucoma surgery. Intraoperative application of mitomycin C (MMC) is the current gold standard to reduce the fibrotic response. However, MMC is cytotoxic and one-time application is often insufficient. A sustained-release drug delivery system (DDS), loaded with MMC, may be less cytotoxic and equally or more effective. Two degradable (polycaprolactone (PCL) and polylactic-co-glycolic acid (PLGA)) MMC-loaded DDSs are developed. Release kinetics are first assessed in vitro followed by rabbit implants in conjunction with the PRESERFLO MicroShunt. As a control, the MicroShunt is implanted with adjunctive use of a MMC solution. Rabbits are euthanized at postoperative day (POD) 28 and 90. The PLGA and PCL DDSs release (on average) 99% and 75% of MMC, respectively. All groups show functioning blebs until POD 90. Rabbits implanted with a DDS show more inflammation with avascular thin-walled blebs when compared to the control. However, collagen is more loosely arranged. The PLGA DDS shows less inflammation, less foreign body response (FBR), and more complete degradation at POD 90 when compared to the PCL DDS. Further optimization with regard to dosage is required to reduce side effects to the conjunctiva. 相似文献
516.
517.