全文获取类型
收费全文 | 2132篇 |
免费 | 91篇 |
国内免费 | 23篇 |
专业分类
化学 | 1480篇 |
晶体学 | 12篇 |
力学 | 90篇 |
综合类 | 1篇 |
数学 | 340篇 |
物理学 | 323篇 |
出版年
2024年 | 6篇 |
2023年 | 26篇 |
2022年 | 45篇 |
2021年 | 126篇 |
2020年 | 107篇 |
2019年 | 90篇 |
2018年 | 88篇 |
2017年 | 73篇 |
2016年 | 123篇 |
2015年 | 70篇 |
2014年 | 81篇 |
2013年 | 197篇 |
2012年 | 139篇 |
2011年 | 150篇 |
2010年 | 88篇 |
2009年 | 80篇 |
2008年 | 102篇 |
2007年 | 92篇 |
2006年 | 79篇 |
2005年 | 78篇 |
2004年 | 59篇 |
2003年 | 61篇 |
2002年 | 36篇 |
2001年 | 24篇 |
2000年 | 15篇 |
1999年 | 16篇 |
1998年 | 9篇 |
1997年 | 5篇 |
1996年 | 15篇 |
1995年 | 6篇 |
1994年 | 8篇 |
1993年 | 13篇 |
1992年 | 14篇 |
1991年 | 10篇 |
1990年 | 7篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1986年 | 10篇 |
1985年 | 9篇 |
1984年 | 7篇 |
1983年 | 9篇 |
1982年 | 10篇 |
1980年 | 10篇 |
1979年 | 9篇 |
1978年 | 8篇 |
1976年 | 4篇 |
1975年 | 6篇 |
1974年 | 2篇 |
1971年 | 2篇 |
排序方式: 共有2246条查询结果,搜索用时 296 毫秒
1.
Fadl A. M. El-Kholy E. M. S. Abulyazid I. Shoman A. A. Awad H. H. Mohammed H. S. 《Journal of Cluster Science》2022,33(6):2601-2615
Journal of Cluster Science - Many environmental hazards are due to chemical insecticides and enhance mosquito species' resistance. This problem is solved by using safer nanocides that reduce... 相似文献
2.
Ahmed Sameh E. Mansour M. A. Hussein Ahmed Kadhim Mallikarjuna B. Almeshaal Mohammed A. Kolsi Lioua 《Journal of Thermal Analysis and Calorimetry》2019,135(2):1443-1449
Journal of Thermal Analysis and Calorimetry - In the present paper, the performance of the graphene oxide in the solar steam generation has experimentally been examined. For this purpose, a setup... 相似文献
3.
Alibe Ibrahim Mustapha Matori Khamirul Amin Sidek Hj Ab Aziz Yaakob Yazid Rashid Umer Alibe Ali Mustapha Zaid Mohd Hafiz Mohd Nasir Salisu Nasir Maharaz Mohammed 《Journal of Thermal Analysis and Calorimetry》2019,136(6):2249-2268
Journal of Thermal Analysis and Calorimetry - Willemite is an inorganic semiconductor material used for optoelectronic applications. The present study purposes a new polymer thermal treatment... 相似文献
4.
Kamel Mohammed Saad Lezsovits Ferenc Hussein Ahmed Kadhim 《Journal of Thermal Analysis and Calorimetry》2019,138(6):4019-4043
Journal of Thermal Analysis and Calorimetry - Flow boiling heat transfer widely utilized in numerous industrial applications such as boiler tubes, evaporators and cooling of reactors in a nuclear... 相似文献
5.
Syed Mohammed Basheeruddin Asdaq Earla Swathi Sunil S Dhamanigi Mohammed Asad Yahya Ali Mohzari Ahmed A. Alrashed Abdulrahman S. Alotaibi Batool Mohammed Alhassan Sreeharsha Nagaraja 《Molecules (Basel, Switzerland)》2020,25(22)
The carrot plant (Daucus carota) and its components are traditionally reported for the management of gastric ulcers. This study was performed to evaluate the role of carrot when administered concurrently with a conventional antiulcer treatment, pantoprazole, in alleviating gastric and duodenal ulcers in female experimental animals. The study involved standard animal models to determine the ulcer preventive effect using pylorus ligation, ethanol, and stress induced acute gastric ulcer models and duodenal ulcer models involving cysteamine. Acetic acid-induced chronic gastric ulcer and indomethacin-induced gastric ulcer models were used to evaluate the ulcer healing effect. Carrot fruit (500 mg/kg) and its co-administration with pantoprazole produced significant protection in an ethanol- and stress-induced acute gastric ulcer and cysteamine-induced duodenal ulcer. The healing of the acetic acid-induced chronic gastric ulcer was also augmented with this combination. Both total proteins and mucin contents were significantly increased in indomethacin-induced gastric ulcers. Similarly, in pylorus ligation, the pepsin content of gastric juice, total acidity, and free acidity were reduced. Overall, both ulcer preventive effects and ulcer healing properties of the pantoprazole were significantly enhanced in animals who received the co-administration of carrot fruit (500 mg/kg). 相似文献
6.
Morsy H. A. Mohammed S. M. Abdel Hamid A. M. Moustafa A. H. El-Sayed H. A. 《Russian Journal of Organic Chemistry》2020,56(1):143-147
Russian Journal of Organic Chemistry - A facile synthesis of a new series of 1,2,3-triazolyl nucleosides via one-pot click reaction is described. Acetylenic nicotinonitriles synthesized previously... 相似文献
7.
Nonlinear Dynamics - Introduction of stiffness nonlinearities to broaden the frequency bandwidth of vibratory energy harvesters has the adverse influence of complicating the response behavior of... 相似文献
8.
Kacimi Rachid Bourass Mohamed Toupance Thierry Wazzan Nuha Chemek Mourad El Alamy Aziz Bejjit Lahcen Alimi Kamel Bouachrine Mohammed 《Research on Chemical Intermediates》2020,46(6):3247-3262
Research on Chemical Intermediates - A theoretical study on four organic dyes based on bis(4-hexyloxy)triphenylamine as donor and electron acceptor cyanoacrylic acid with a... 相似文献
9.
10.