|||
影响因子
|
> 20
|
>15
|
>10
|
>5
|
>3
|
>1.5
|
>1
|
全部
|
全球
|
29
|
52
|
105
|
345
|
979
|
2588
|
3620
|
6426
|
美国
|
19
|
39
|
72
|
198
|
516
|
1190
|
1599
|
2443
|
65.5%
|
75.0%
|
68.6%
|
57.4%
|
52.7%
|
46.0%
|
44.2%
|
38.0%
|
|
英国
|
9
|
11
|
26
|
105
|
279
|
649
|
887
|
1363
|
31.0%
|
21.2%
|
24.8%
|
30.4%
|
28.5%
|
25.1%
|
24.5%
|
21.2%
|
|
德国
|
0
|
0
|
1
|
8
|
45
|
149
|
231
|
454
|
0.0%
|
0.0%
|
1.0%
|
2.3%
|
4.6%
|
5.8%
|
6.4%
|
7.1%
|
|
日本
|
0
|
0
|
0
|
1
|
3
|
25
|
56
|
170
|
0.0%
|
0.0%
|
0.0%
|
0.3%
|
0.3%
|
1.0%
|
1.5%
|
2.6%
|
|
加拿大
|
0
|
0
|
0
|
0
|
4
|
21
|
34
|
78
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.4%
|
0.8%
|
0.9%
|
1.2%
|
|
中国
|
0
|
0
|
0
|
0
|
2
|
7
|
9
|
76
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.2%
|
0.3%
|
0.2%
|
1.2%
|
|
澳大利亚
|
0
|
0
|
0
|
0
|
1
|
20
|
34
|
67
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.1%
|
0.8%
|
0.9%
|
1.0%
|
|
俄国
|
0
|
0
|
0
|
0
|
0
|
3
|
9
|
108
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.1%
|
0.2%
|
1.7%
|
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