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Creation Date 

1. Before 1960  (14,529)
2. 1960 To 1975  (51,087)
3. 1976 To 1991  (198,839)
4. 1992 To 2008  (467,594)
5. After 2008  (737,510)
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New Records 

1. New From Last Week  (17)
2. New From Last Month  (34,390)
3. New From Last 3 Month  (35,074)
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Resource Type 

1. Patents  (1,429,139)
2. Articles  (23,581)
3. Newsletter Articles  (12,219)
4. Newspaper Articles  (1,832)
5. magazinearticle  (1,721)
6. Reports  (656)
7. Web Resources  (461)
8. Books  (365)
9. Thesises (postgraduate)  (322)
10. Conference Proceedings  (293)
11. Book Chapters  (169)
12. Audio  (23)
13. Reviews  (21)
14. Text Resources  (14)
15. Datasets  (7)
16. References  (4)
17. Government Documents  (2)
18. Standards  (1)
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Subject 

1. Physics  (1,130,861)
2. Testing  (588,020)
3. Measuring  (587,998)
4. Basic Electric Elements  (483,721)
5. Measuring Magnetic Variables  (472,701)
6. Measuring Electric Variables  (472,701)
7. Electric Communication Technique  (458,084)
8. Generation  (349,487)
9. Conversion Or Distribution Of Electric Power  (349,430)
10. Education  (295,502)
11. Cryptography  (295,295)
12. Advertising  (295,275)
13. Seals  (295,256)
14. Display  (295,252)
15. Pictorial Communication, E.G. Television  (248,057)
16. Semiconductor Devices  (237,285)
17. Electric Solid State Devices Not Otherwise Provided For  (237,270)
18. Controlling  (222,568)
19. Regulating  (222,567)
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Databases 

1. esp@cenet  (1,429,139)
2. ProQuest Central  (38,448)
3. DOAJ Directory of Open Access Journals  (12,644)
4. ROAD: Directory of Open Access Scholarly Resources  (11,346)
5. Geneva Foundation Free Medical Journals at publisher websites  (7,933)
6. MEDLINE  (2,092)
7. Open Access: PubMed Central  (1,362)
8. Coronavirus Research Database  (1,112)
9. Open Access: IOP Publishing Free Content  (693)
10. SpringerOpen  (669)
11. IOPscience (Open Access)  (584)
12. RePEc  (512)
13. Open Access: Wiley-Blackwell Open Access Journals  (399)
14. ProQuest One Psychology  (360)
15. Open Knowledge Repository  (283)
16. Open Access: Nature Open Access  (257)
17. Public Library of Science  (248)
18. Open Access: EDP Open  (218)
19. SWEPUB Freely available online  (197)
20. Taylor & Francis (Open access)  (188)
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Language 

1. English  (1,286,403)
2. Chinese  (232,284)
3. French  (197,399)
4. German  (165,809)
5. Korean  (79,018)
6. Japanese  (67,534)
7. Spanish  (12,718)
8. Russian  (6,741)
9. Portuguese  (5,468)
10. Italian  (4,142)
11. Swedish  (3,779)
12. Dutch  (2,304)
13. Finnish  (2,230)
14. Danish  (1,938)
15. Polish  (1,844)
16. Norwegian  (1,598)
17. Ukrainian  (496)
18. Romanian  (490)
19. Czech  (415)
20. Hungarian  (345)
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Journal Title 

1. Applied Sciences  (531)
2. Contify Energy News  (434)
3. Energies  (4,564)
4. Environmental Science And Pollution Research International  (253)
5. International Journal Of Energy Economics And Policy  (243)
6. Iop Conference Series: Earth And Environmental Science  (286)
7. Iop Conference Series. Earth And Environmental Science  (292)
8. Sensors  (254)
9. Sustainability  (1,464)
10. The Energy Journal  (528)
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