Lọc kết quả

Năm xuất bản 

1. Trước1957  (427.077)
2. 1957 đến 1973  (995.902)
3. 1974 đến 1990  (3.264.065)
4. 1991 đến 2008  (8.883.271)
5. Sau 2008  (16.255.949)
6. Lựa chọn khác 

Tài liệu mới 

1. Mới từ tuần trước  (26.886)
2. Mới từ tháng trước  (40.899)
3. Mới từ 3 tháng trước  (165.532)
4. Lựa chọn khác 

Dạng tài nguyên 

1. Bài báo  (27.287.140)
2. Sáng chế  (1.213.137)
3. Book Chapters  (331.214)
4. magazinearticle  (325.951)
5. Kỷ yếu hội nghị  (282.270)
6. Bình xét khoa học  (145.469)
7. Sách  (58.687)
8. Báo cáo thực tập  (22.633)
9. Tin tức  (14.387)
10. Luận văn/Luận án  (11.063)
11. Videos  (6.837)
12. Web Resources  (6.482)
13. Từ điển/Bách khoa thư  (5.447)
14. Newsletter Articles  (4.389)
15. Tài liệu chính phủ  (3.606)
16. Datasets  (1.764)
17. Dạng khác  (1.454)
18. Tài nguyên văn bản  (1.287)
19. Hình ảnh  (1.009)
20. Standards  (967)
21. Tạp chí  (540)
22. Lựa chọn khác 

Chủ đề 

1. Science & Technology  (26.174.457)
2. Life Sciences & Biomedicine  (16.539.720)
3. Humans  (7.381.750)
4. Physical Sciences  (6.776.790)
5. Technology  (4.540.100)
6. Female  (3.740.356)
7. Male  (3.719.894)
8. Animals  (3.431.123)
9. Biological And Medical Sciences  (3.209.834)
10. Chemistry  (2.887.616)
11. Physics  (2.823.326)
12. Exact Sciences And Technology  (2.475.336)
13. Engineering  (2.075.456)
14. Adult  (2.046.960)
15. Middle Aged  (1.851.384)
16. Medical Sciences  (1.846.465)
17. Biochemistry & Molecular Biology  (1.713.934)
18. Science & Technology - Other Topics  (1.679.245)
19. Fundamental And Applied Biological Sciences. Psychology  (1.481.833)
20. General & Internal Medicine  (1.409.471)
21. Lựa chọn khác 

Tác giả 

1. Chirikure, Shadreck  (29)
2. National Research Council (U.S.)  (15)
3. Policy and Global Affairs  (9)
4. Wessner, Charles W  (8)
5. National Research Council  (7)
6. National Research Council Staff  (7)
7. National Academy of Sciences Staff  (5)
8. National Research Council (U.S.). Committee on Capitalizing on Science, Technology, and Innovation: An Assessment of the Small Business Innovation Research Program  (5)
9. National Academy of Sciences (U.S.)  (4)
10. National Academy of Sciences  (4)
11. National Academy of Engineering Staff  (4)
12. Institute of Medicine  (4)
13. Board on Science, Technology, and Economic Policy  (3)
14. Division on Engineering and Physical Sciences  (3)
15. National Academy of Engineering  (3)
16. National Academies of Sciences, Engineering, and Medicine; Policy and Global Affairs; Board on Science, Technology, and Economic Policy  (2)
17. Committee for Capitalizing on Science, Technology, and Innovation: An Assessment of the Small Business Innovation Research Pr  (2)
18. Poirier, Carol  (2)
19. Board on Science, Technology and Economic Policy Staff  (2)
20. Charles W. Wessner  (2)
21. Committee on Science, Engineering, and Public Policy  (2)
22. National Academy of Sciences, National Academy of Engineering, Institute of Medicine  (2)
23. Committee for Capitalizing on Science, Technology, and Innovation: An Assessment of the Small Business Innovation Research Program  (2)
24. United Nations Commission on Science and Technology for Development  (2)
25. International Development Research Centre (Canada)  (2)
26. Committee on Capitalizing on Science, Technology, and Innovation: An Assessment of the Small Business Innovation Research Pro  (2)
27. Chirikure, Shadreck  (1)
28. State Science and Technology Commission of the People's Republic of China  (1)
29. Van Ameringen, Marc  (1)
30. Louis, Garrick E  (1)
31. Committee on Challenges for the Chemical Sciences in the 21st Century  (1)
32. Lựa chọn khác 

Cơ sở dữ liệu 

1. ProQuest Central  (12.024.838)
2. MEDLINE  (11.130.834)
3. DOAJ Directory of Open Access Journals  (7.897.345)
4. GFMER Free Medical Journals  (7.226.412)
5. PubMed Central  (6.776.664)
6. ROAD: Directory of Open Access Scholarly Resources  (5.957.214)
7. HighWire Press (Free Journals)  (2.542.809)
8. Springer Nature OA/Free Journals  (1.353.768)
9. esp@cenet  (1.172.027)
10. Wiley-Blackwell Open Access Titles  (1.111.832)
11. ProQuest One Psychology  (1.049.561)
12. Nature Open Access  (497.853)
13. IOP Publishing Free Content  (427.183)
14. Hyper Article en Ligne (HAL) (Open Access)  (414.041)
15. IngentaConnect Free/Open Access Journals  (335.011)
16. Public Library of Science (PLoS)  (334.911)
17. Journals@Ovid Open Access Journal Collection Rolling  (319.946)
18. Oxford Journals Open Access Collection  (311.519)
19. JSTOR Early Journal Content Free  (294.086)
20. Freely Accessible Journals  (288.530)
21. Lựa chọn khác 

Ngôn ngữ 

1. English  (29.135.641)
2. Japanese  (3.252.535)
3. Chinese  (1.327.727)
4. Portuguese  (219.140)
5. French  (99.511)
6. German  (94.354)
7. Spanish  (73.245)
8. Korean  (60.127)
9. Russian  (47.193)
10. Norwegian  (19.140)
11. Turkish  (16.488)
12. Polish  (12.663)
13. Hungarian  (8.011)
14. Italian  (7.787)
15. Czech  (6.786)
16. Persian  (4.483)
17. Dutch  (3.972)
18. Slovak  (3.905)
19. Croatian  (3.246)
20. Arabic  (3.165)
21. Lựa chọn khác 

Nhan đề tạp chí 

1. Bmj  (185.929)
2. British Medical Journal  (122.701)
3. Journal Of The American Chemical Society  (104.060)
4. Nature  (217.232)
5. Plos One  (280.789)
6. Proceedings Of The National Academy Of Sciences - Pnas  (139.288)
7. Scientific Reports  (192.371)
8. The Astrophysical Journal  (113.060)
9. The Journal Of Biological Chemistry  (161.436)
10. The Lancet  (124.262)
11. Lựa chọn khác