全文获取类型
收费全文 | 1302篇 |
免费 | 114篇 |
国内免费 | 184篇 |
专业分类
化学 | 64篇 |
晶体学 | 1篇 |
力学 | 21篇 |
综合类 | 52篇 |
数学 | 1246篇 |
物理学 | 216篇 |
出版年
2024年 | 4篇 |
2023年 | 22篇 |
2022年 | 26篇 |
2021年 | 34篇 |
2020年 | 33篇 |
2019年 | 34篇 |
2018年 | 59篇 |
2017年 | 57篇 |
2016年 | 29篇 |
2015年 | 31篇 |
2014年 | 45篇 |
2013年 | 333篇 |
2012年 | 44篇 |
2011年 | 61篇 |
2010年 | 38篇 |
2009年 | 56篇 |
2008年 | 74篇 |
2007年 | 50篇 |
2006年 | 75篇 |
2005年 | 52篇 |
2004年 | 50篇 |
2003年 | 60篇 |
2002年 | 65篇 |
2001年 | 39篇 |
2000年 | 46篇 |
1999年 | 36篇 |
1998年 | 33篇 |
1997年 | 41篇 |
1996年 | 22篇 |
1995年 | 19篇 |
1994年 | 9篇 |
1993年 | 7篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1989年 | 4篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1959年 | 1篇 |
排序方式: 共有1600条查询结果,搜索用时 15 毫秒
971.
972.
973.
Crystalline silicon bifacial photovoltaic modules (BFPVs), which simultaneously harvest the front- and rear-incident light, are suitable for building-integrated energy harvesting system due to their high power output and transparency. However, the lack of a rear reflector in semi-transparent BFPVs lowers their efficiency. In this study, we proposed a selective reflector (SR) with a dielectric/metal/dielectric structure to increase the power output of BFPVs and ensure a clear view through the BFPV windows. The SRs exhibit a high transmittance in the visible-light region and a high reflectance in the near-infrared (NIR)-light region. By recycling unabsorbed photons by SR, the power output of the SR-incorporated BFPVs is 13.2% higher than that of the BFPVs with bare glass. Moreover, the SR prevents the heating of the interior of buildings by reflecting the NIR light. Hence, the SR can contribute to energy efficiency of buildings. 相似文献
974.
We look at two analogs each for the well-known congruences of Fermat and Wilson in the case of polynomials over finite fields. When we look at them modulo higher powers of primes, we find interesting relations linking them together, as well as linking them with derivatives and zeta values. The link with the zeta value carries over to the number field case, with the zeta value at 1 being replaced by Euler's constant. 相似文献
975.
976.
977.
978.
979.
Mohamed W. Attwa Hany W. Darwish Nasser S. Al-Shakliah Adnan A. Kadi 《Molecules (Basel, Switzerland)》2021,26(9)
The concurrent use of oral encorafenib (Braftovi, ENF) and binimetinib (Mektovi, BNB) is a combination anticancer therapy approved by the United States Food and Drug Administration (USFDA) for patients with BRAFV600E/V600K mutations suffering from metastatic or unresectable melanoma. Metabolism is considered one of the main pathways of drug elimination from the body (responsible for elimination of about 75% of known drugs), it is important to understand and study drug metabolic stability. Metabolically unstable compounds are not good as they required repetitive dosages during therapy, while very stable drugs may result in increasing the risk of adverse drug reactions. Metabolic stability of compounds could be examined using in vitro or in silico experiments. First, in silico metabolic vulnerability for ENF and BNB was investigated using the StarDrop WhichP450 module to confirm the lability of the drugs under study to liver metabolism. Second, we established an LC–MS/MS method for the simultaneous quantification of ENF and BNB applied to metabolic stability assessment. Third, in silico toxicity assessment of ENF and BNB was performed using the StarDrop DEREK module. Chromatographic separation of ENF, BNB, and avitinib (an internal standard) was achieved using an isocratic mobile phase on a Hypersil BDS C18 column. The linear range for ENF and BNB in the human liver microsome (HLM) matrix was 5–500 ng/mL (R2 ≥ 0.999). The metabolic stabilities were calculated using intrinsic clearance and in vitro half-life. Furthermore, ENF and BNB did not significantly influence each other’s metabolic stability or metabolic disposition when used concurrently. These results indicate that ENF and BNB will slowly bioaccumulate after multiple doses. 相似文献
980.