全文获取类型
收费全文 | 23146篇 |
免费 | 3746篇 |
国内免费 | 3521篇 |
专业分类
化学 | 16926篇 |
晶体学 | 386篇 |
力学 | 1317篇 |
综合类 | 318篇 |
数学 | 2692篇 |
物理学 | 8774篇 |
出版年
2024年 | 52篇 |
2023年 | 378篇 |
2022年 | 737篇 |
2021年 | 776篇 |
2020年 | 840篇 |
2019年 | 902篇 |
2018年 | 780篇 |
2017年 | 815篇 |
2016年 | 1092篇 |
2015年 | 1153篇 |
2014年 | 1353篇 |
2013年 | 1702篇 |
2012年 | 2060篇 |
2011年 | 2038篇 |
2010年 | 1454篇 |
2009年 | 1468篇 |
2008年 | 1666篇 |
2007年 | 1564篇 |
2006年 | 1432篇 |
2005年 | 1182篇 |
2004年 | 976篇 |
2003年 | 823篇 |
2002年 | 921篇 |
2001年 | 805篇 |
2000年 | 626篇 |
1999年 | 503篇 |
1998年 | 381篇 |
1997年 | 277篇 |
1996年 | 286篇 |
1995年 | 250篇 |
1994年 | 192篇 |
1993年 | 185篇 |
1992年 | 129篇 |
1991年 | 108篇 |
1990年 | 104篇 |
1989年 | 80篇 |
1988年 | 62篇 |
1987年 | 54篇 |
1986年 | 44篇 |
1985年 | 53篇 |
1984年 | 21篇 |
1983年 | 18篇 |
1982年 | 17篇 |
1981年 | 10篇 |
1980年 | 10篇 |
1979年 | 9篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1976年 | 6篇 |
1936年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Kai Cheng Xiao-Shuai Zhang Jie An Cheng Li Ruo-Yun Zhang Run Ye Prof. Dr. Bang-Jiao Ye Prof. Dr. Bo Liu Prof. Dr. Yuan-Di Zhao 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(31):7553-7560
Given their superior penetration depths, photosensitizers with longer absorption wavelengths present broader application prospects in photodynamic therapy (PDT). Herein, Ag2S quantum dots were discovered, for the first time, to be capable of killing tumor cells through the photodynamic route by near-infrared light irradiation, which means relatively less excitation of the probe compared with traditional photosensitizers absorbing short wavelengths. On modification with polydopamine (PDA), PDA-Ag2S was obtained, which showed outstanding capacity for inducing reactive oxygen species (increased by 1.69 times). With the addition of PDA, Ag2S had more opportunities to react with surrounding O2, which was demonstrated by typical triplet electron spin resonance (ESR) analysis. Furthermore, the PDT effects of Ag2S and PDA-Ag2S achieved at longer wavelengths were almost identical to the effects produced at 660 nm, which was proved by studies in vitro. PDA-Ag2S showed distinctly better therapeutic effects than Ag2S in experiments in vivo, which further validated the enhanced regulatory effect of PDA. Altogether, a new photosensitizer with longer absorption wavelength was developed by using the hitherto-unexplored photodynamic function of Ag2S quantum dots, which extended and enhanced the regulatory effect originating from PDA. 相似文献
2.
Analysis and pharmacokinetic study of polyphyllin H in beagle dog plasma after oral administration of Rhizoma Paridis Extracts by LC‐MS/MS 下载免费PDF全文
3.
4.
We investigate terahertz radiation(T-rays) from a pentacene organic diode at room temperature. The quantum chemistry calculation for frequency-related Huang–Rhys factor of pentacene is also carried out. The results demonstrate that the T-rays can come from a bending vibration of pentacene skeleton after the energy of pentacene exciton transferring to the vibrational excited state via electron–phonon coupling. Frequency and natural bond orbital analytics of pentacene and its derivatives are performed in order to explain the result and develop new materials to get higher emission. This work provides a new way to produce T-rays with a simple device at room temperature. 相似文献
5.
6.
Journal of Thermal Analysis and Calorimetry - The fire behavior of one flame-retardant PVC cable used as building wire is investigated in this work. Bench scale tests were performed using a cone... 相似文献
7.
Ionics - This study aims to explore the potential merits of palladium oxide sensing electrode. PdO is applied on a solid-state potentiometric sensor on an yttria-stabilized zirconia (YSZ)... 相似文献
8.
9.
10.