Mietek Jaroniec

873(top 0.1%)

papers

108.5K(top 0.1%)

citations

146(top 0.1%)

h-index

321(top 0.1%)

g-index

916

all documents

114.5K

doc citations

2.1K

citing journals

105

times ranked

1^st most published author in Materials Science (1975) [with 7 articles having 353 citations]

1^st most published author in Materials Science (1977) [with 8 articles having 93 citations]

1^st most cited paper in Applied Physics (2017) [with 3653 citations of an article]

1^st most published author in Materials Chemistry (1978) [with 6 articles having 72 citations]

2^nd most published author in Physical Sciences (1978) [with 21 articles having 344 citations]

2^nd most published author in Chemical Engineering (1978) [with 8 articles having 128 citations]

2^nd most published author in Materials Science (1978) [with 11 articles having 158 citations]

2^nd most published author in Chemistry (1978) [with 18 articles having 303 citations]

2^nd most published author in Inorganic Chemistry (1978) [with 6 articles having 72 citations]

3^rd most published author in Applied Sciences (1978) [with 8 articles having 128 citations]

3^rd most published author in Chemical Engineering (1979) [with 6 articles having 99 citations]

3^rd most cited paper in Electrochemistry (1989) [with 531 citations of an article]

4^th most published author in Chemical Engineering (1980) [with 6 articles having 134 citations]

4^th most cited author in Chemical Engineering (2000) [with 4184 citations of 14 articles]

4^th most cited author in Inorganic Chemistry (2000) [with 3178 citations of 16 articles]

4^th most published author in Physical Chemistry (1978) [with 9 articles having 116 citations]

4^th most cited paper in Spectroscopy (1989) [with 531 citations of an article]

4^th most published author in Materials Chemistry (1981) [with 6 articles having 60 citations]

4^th most published author in Materials Chemistry (1982) [with 6 articles having 58 citations]

4^th most cited author in Materials Chemistry (2000) [with 3178 citations of 16 articles]

5^th most published author in Physical Sciences (1977) [with 13 articles having 124 citations]

5^th most published author in Physical Sciences (1981) [with 18 articles having 291 citations]

5^th most published author in Chemistry (1977) [with 12 articles having 116 citations]

5^th most cited author in Chemistry (2015) [with 14722 citations of 31 articles]

5^th most published author in Inorganic Chemistry (1981) [with 6 articles having 60 citations]

5^th most cited author in Electrochemistry (1989) [with 531 citations of 3 articles]

5^th most cited author in Spectroscopy (1989) [with 531 citations of 3 articles]

6^th most cited paper in Mechanical Engineering (2017) [with 3642 citations of an article]

6^th most published author in Chemical Engineering (1977) [with 6 articles having 73 citations]

6^th most published author in Materials Science (1982) [with 8 articles having 82 citations]

6^th most published author in Chemistry (1979) [with 13 articles having 252 citations]

6^th most cited paper in Mechanics (2017) [with 3642 citations of an article]

6^th most cited paper in Mechanics of Materials (2017) [with 3642 citations of an article]

7^th most published author in Applied Sciences (1979) [with 6 articles having 99 citations]

7^th most published author in Physical Sciences (1976) [with 15 articles having 319 citations]

7^th most published author in Chemical Engineering (1981) [with 7 articles having 123 citations]

7^th most published author in Materials Science (1976) [with 7 articles having 203 citations]

8^th most published author in Physical Sciences (1979) [with 15 articles having 267 citations]

8^th most published author in Materials Science (1980) [with 9 articles having 137 citations]

8^th most published author in Chemistry (1990) [with 20 articles having 264 citations]

8^th most cited author in Mechanics (2015) [with 5076 citations of 4 articles]

8^th most cited paper in Mechanics of Materials (2001) [with 1561 citations of an article]

8^th most cited author in Mechanics of Materials (2015) [with 5076 citations of 4 articles]

9^th most published author in Applied Sciences (1977) [with 6 articles having 73 citations]

9^th most cited author in Applied Sciences (2000) [with 4261 citations of 15 articles]

9^th most published author in Physical Sciences (1980) [with 14 articles having 242 citations]

9^th most published author in Chemical Engineering (1985) [with 6 articles having 89 citations]

9^th most published author in Chemistry (1981) [with 14 articles having 250 citations]

9^th most cited author in Mechanics (2017) [with 3642 citations of 3 articles]

9^th most cited paper in Applied Physics (2015) [with 3858 citations of an article]

9^th most published author in Physical Chemistry (2005) [with 20 articles having 552 citations]

9^th most cited author in Mechanics of Materials (2017) [with 3642 citations of 3 articles]

10^th most published author in Applied Sciences (1980) [with 6 articles having 134 citations]

10^th most published author in Chemical Engineering (2002) [with 16 articles having 981 citations]

10^th most cited author in Chemistry (2014) [with 14526 citations of 28 articles]

10^th most cited paper in Inorganic Chemistry (1975) [with 223 citations of an article]

10^th most published author in Inorganic Chemistry (1982) [with 6 articles having 58 citations]

10^th most cited paper in Materials Chemistry (1975) [with 223 citations of an article]

10^th most published author in Materials Chemistry (2000) [with 16 articles having 3178 citations]

11^th most published author in Applied Sciences (1981) [with 7 articles having 123 citations]

11^th most cited author in Mechanical Engineering (2017) [with 3642 citations of 3 articles]

11^th most published author in Materials Science (1981) [with 8 articles having 104 citations]

11^th most published author in Chemistry (1975) [with 9 articles having 379 citations]

11^th most published author in Chemistry (1988) [with 17 articles having 176 citations]

11^th most cited paper in Mechanics (2001) [with 1561 citations of an article]

11^th most cited author in Applied Physics (2015) [with 3858 citations of 2 articles]

11^th most cited author in Inorganic Chemistry (1975) [with 223 citations of 3 articles]

11^th most cited author in Materials Chemistry (1975) [with 223 citations of 3 articles]

12^th most published author in Physical Sciences (1975) [with 11 articles having 429 citations]

12^th most published author in Physical Sciences (1982) [with 14 articles having 189 citations]

12^th most published author in Chemical Engineering (1987) [with 6 articles having 61 citations]

12^th most cited paper in Chemical Engineering (2000) [with 4184 citations of an article]

12^th most published author in Chemistry (1983) [with 15 articles having 444 citations]

12^th most cited paper in Electrochemistry (1999) [with 919 citations of an article]

12^th most cited author in Mechanics of Materials (2001) [with 1561 citations of 3 articles]

12^th most cited paper in Materials Chemistry (2001) [with 3623 citations of an article]

13^th most published author in Chemistry (1976) [with 11 articles having 282 citations]

13^th most cited author in Chemistry (2000) [with 5785 citations of 24 articles]

13^th most cited author in Applied Physics (2017) [with 3653 citations of 4 articles]

13^th most published author in Inorganic Chemistry (2000) [with 16 articles having 3178 citations]

13^th most cited author in Electrochemistry (1999) [with 919 citations of 5 articles]

13^th most cited author in Spectroscopy (1999) [with 919 citations of 5 articles]

14^th most cited paper in Mechanical Engineering (2001) [with 1561 citations of an article]

14^th most cited author in Mechanics (2001) [with 1561 citations of 3 articles]

14^th most cited paper in Inorganic Chemistry (2001) [with 3623 citations of an article]

14^th most cited paper in Biochemistry (2000) [with 2331 citations of an article]

14^th most cited author in Materials Chemistry (2001) [with 3623 citations of 6 articles]

15^th most published author in Physical Sciences (1983) [with 16 articles having 445 citations]

15^th most cited author in Chemical Engineering (2012) [with 6377 citations of 12 articles]

15^th most published author in Physical Chemistry (1980) [with 6 articles having 54 citations]

16^th most published author in Materials Science (1979) [with 6 articles having 96 citations]

16^th most published author in Chemistry (1980) [with 11 articles having 189 citations]

16^th most cited author in Inorganic Chemistry (2001) [with 3623 citations of 6 articles]

16^th most published author in Materials Chemistry (2002) [with 14 articles having 863 citations]

17^th most published author in Applied Sciences (1985) [with 6 articles having 89 citations]

17^th most cited author in Applied Sciences (2014) [with 9459 citations of 22 articles]

17^th most cited author in Physical Sciences (2014) [with 14526 citations of 28 articles]

17^th most published author in Chemical Engineering (1990) [with 7 articles having 80 citations]

17^th most cited author in Chemical Engineering (2014) [with 6100 citations of 15 articles]

17^th most cited paper in Industrial Engineering (1981) [with 38 citations of an article]

17^th most published author in Chemistry (1982) [with 11 articles having 128 citations]

17^th most cited author in Analytical Chemistry (1979) [with 148 citations of 5 articles]

17^th most published author in Physical Chemistry (1981) [with 7 articles having 65 citations]

17^th most published author in Physical Chemistry (1983) [with 7 articles having 269 citations]

17^th most published author in Physical Chemistry (2000) [with 16 articles having 1631 citations]

18^th most cited author in Mechanical Engineering (2015) [with 4696 citations of 3 articles]

18^th most published author in Chemical Engineering (2000) [with 14 articles having 4184 citations]

18^th most published author in Materials Science (1988) [with 11 articles having 124 citations]

18^th most cited author in Materials Science (2001) [with 5299 citations of 14 articles]

18^th most cited paper in Applied Physics (2001) [with 1497 citations of an article]

19^th most cited paper in Spectroscopy (1999) [with 919 citations of an article]

20^th most cited author in Chemical Engineering (2001) [with 3929 citations of 9 articles]

20^th most cited author in Biochemistry (2014) [with 4391 citations of 3 articles]

21^st most cited paper in Chemical Engineering (2001) [with 3929 citations of an article]

21^st most cited author in Biochemistry (2000) [with 2331 citations of 1 articles]

22^nd most cited author in Applied Sciences (2012) [with 7982 citations of 17 articles]

22^nd most published author in Chemical Engineering (2005) [with 16 articles having 669 citations]

22^nd most published author in Materials Science (1983) [with 7 articles having 56 citations]

22^nd most published author in Chemistry (1987) [with 14 articles having 190 citations]

22^nd most cited paper in Inorganic Chemistry (2000) [with 3178 citations of an article]

22^nd most cited paper in Materials Chemistry (2000) [with 3178 citations of an article]

23^rd most published author in Physical Sciences (1990) [with 20 articles having 264 citations]

23^rd most cited author in Chemical Engineering (lifetime) [with 47265 citations of 344 articles]

23^rd most published author in Chemistry (1985) [with 12 articles having 146 citations]

23^rd most cited paper in Solid State Physics (1975) [with 27 citations of an article]

23^rd most cited author in Analytical Chemistry (1978) [with 125 citations of 5 articles]

24^th most cited author in Applied Sciences (lifetime) [with 73395 citations of 449 articles]

24^th most published author in Physical Sciences (1988) [with 17 articles having 176 citations]

24^th most cited author in Applied Physics (2001) [with 1497 citations of 2 articles]

24^th most published author in Physical Chemistry (1982) [with 6 articles having 58 citations]

25^th most cited paper in Applied Sciences (2000) [with 4261 citations of an article]

25^th most cited author in Applied Sciences (2001) [with 5490 citations of 12 articles]

25^th most cited author in Mechanical Engineering (2001) [with 1561 citations of 3 articles]

25^th most cited author in Chemistry (2012) [with 11441 citations of 26 articles]

25^th most cited paper in Mechanics (2015) [with 5076 citations of an article]

25^th most cited paper in Mechanics of Materials (2015) [with 5076 citations of an article]

26^th most published author in Chemistry (1984) [with 11 articles having 136 citations]

26^th most cited paper in Environmental Chemistry (2012) [with 1552 citations of an article]

26^th most cited author in Organic Chemistry (1979) [with 148 citations of 5 articles]

26^th most cited paper in Clinical Biochemistry (1974) [with 21 citations of an article]

26^th most cited paper in Materials Chemistry (1974) [with 56 citations of an article]

27^th most published author in Applied Sciences (1987) [with 6 articles having 61 citations]

27^th most cited author in Physical Sciences (2015) [with 14921 citations of 32 articles]

27^th most cited author in Materials Chemistry (2011) [with 1687 citations of 7 articles]

28^th most cited paper in Materials Science (2001) [with 5299 citations of an article]

28^th most cited author in Chemistry (lifetime) [with 110118 citations of 805 articles]

28^th most cited paper in Applied Chemistry (2015) [with 970 citations of an article]

28^th most published author in Analytical Chemistry (1996) [with 7 articles having 106 citations]

29^th most cited author in Applied Sciences (2015) [with 9021 citations of 22 articles]

29^th most cited author in Materials Science (2000) [with 3306 citations of 19 articles]

30^th most published author in Chemical Engineering (1997) [with 9 articles having 731 citations]

31^st most published author in Inorganic Chemistry (2002) [with 14 articles having 863 citations]

31^st most cited author in Condensed Matter Physics (1975) [with 223 citations of 3 articles]

32^nd most published author in Physical Sciences (1984) [with 13 articles having 139 citations]

33^rd most cited author in Materials Science (2015) [with 6735 citations of 17 articles]

33^rd most cited author in Chemistry (2001) [with 5931 citations of 20 articles]

33^rd most cited paper in Computational Mathematics (1992) [with 225 citations of an article]

33^rd most cited author in Physical Chemistry (1975) [with 296 citations of 5 articles]

34^th most published author in Materials Science (1990) [with 10 articles having 102 citations]

34^th most cited paper in Applied Physics (2014) [with 2611 citations of an article]

35^th most cited paper in Applied Sciences (2001) [with 5490 citations of an article]

35^th most cited paper in Mechanical Engineering (2015) [with 4696 citations of an article]

35^th most cited author in Computational Mathematics (1992) [with 225 citations of 1 articles]

35^th most cited paper in Inorganic Chemistry (1974) [with 56 citations of an article]

35^th most cited paper in Clinical Biochemistry (1978) [with 45 citations of an article]

36^th most cited paper in Energy (2011) [with 1694 citations of an article]

36^th most cited author in Materials Science (1975) [with 353 citations of 7 articles]

36^th most cited paper in Physical Chemistry (1975) [with 296 citations of an article]

37^th most published author in Applied Sciences (1990) [with 7 articles having 80 citations]

37^th most published author in Applied Sciences (2000) [with 15 articles having 4261 citations]

38^th most published author in Physical Sciences (1985) [with 12 articles having 146 citations]

38^th most published author in Materials Science (1987) [with 8 articles having 85 citations]

38^th most published author in Chemistry (1989) [with 14 articles having 659 citations]

38^th most cited paper in Chemistry (2015) [with 14722 citations of an article]

38^th most cited author in Mechanics (2018) [with 2281 citations of 5 articles]

38^th most cited author in Mechanics of Materials (2018) [with 2281 citations of 5 articles]

39^th most published author in Applied Sciences (2002) [with 17 articles having 990 citations]

39^th most cited author in Physical Sciences (lifetime) [with 111379 citations of 844 articles]

39^th most cited author in Inorganic Chemistry (2011) [with 1687 citations of 7 articles]

39^th most cited paper in Condensed Matter Physics (1975) [with 223 citations of an article]

40^th most published author in Chemical Engineering (1999) [with 9 articles having 563 citations]

40^th most cited paper in Materials Science (2015) [with 6735 citations of an article]

40^th most cited paper in Mechanics (2014) [with 2635 citations of an article]

40^th most cited paper in Mechanics of Materials (2014) [with 2635 citations of an article]

41^st most cited paper in Physics (2015) [with 5425 citations of an article]

41^st most cited author in Chemistry (2011) [with 7587 citations of 26 articles]

41^st most cited author in Physical Chemistry (2000) [with 1631 citations of 16 articles]

43^rd most published author in Physical Sciences (1987) [with 14 articles having 190 citations]

43^rd most published author in Materials Science (2000) [with 19 articles having 3306 citations]

43^rd most cited paper in Analytical Chemistry (1976) [with 79 citations of an article]

43^rd most cited paper in Clinical Biochemistry (1976) [with 30 citations of an article]

44^th most cited author in Materials Science (2011) [with 5652 citations of 18 articles]

45^th most cited author in Applied Physics (2014) [with 2611 citations of 3 articles]

46^th most cited paper in Energy (2012) [with 1574 citations of an article]

46^th most cited author in Mechanical Engineering (2018) [with 2237 citations of 4 articles]

46^th most cited paper in Analytical Chemistry (1974) [with 21 citations of an article]

47^th most published author in Chemistry (2005) [with 31 articles having 1579 citations]

48^th most cited author in Chemical Engineering (1975) [with 130 citations of 4 articles]

48^th most cited paper in Chemistry (2000) [with 5785 citations of an article]

48^th most cited author in Environmental Chemistry (2012) [with 1552 citations of 1 articles]

48^th most published author in Physical Chemistry (1999) [with 12 articles having 1505 citations]

49^th most cited paper in Physical Chemistry (1989) [with 562 citations of an article]

50^th most published author in Chemistry (2000) [with 24 articles having 5785 citations]

50^th most cited author in Applied Chemistry (2015) [with 970 citations of 4 articles]

50^th most cited author in Mechanics of Materials (lifetime) [with 17457 citations of 49 articles]

51^st most cited author in Applied Sciences (2017) [with 6486 citations of 18 articles]

51^st most cited author in Chemical Engineering (2015) [with 3997 citations of 13 articles]

51^st most cited author in Physical Chemistry (1999) [with 1505 citations of 12 articles]

52^nd most published author in Materials Science (1999) [with 18 articles having 2089 citations]

53^rd most published author in Life Sciences (1979) [with 6 articles having 153 citations]

53^rd most published author in Physical Sciences (1989) [with 15 articles having 661 citations]

53^rd most cited author in Chemistry (2017) [with 7417 citations of 28 articles]

53^rd most cited author in Organic Chemistry (1978) [with 125 citations of 5 articles]

53^rd most cited author in Mechanics of Materials (2014) [with 2635 citations of 4 articles]

54^th most cited paper in Applied Sciences (2017) [with 6486 citations of an article]

54^th most published author in Chemical Engineering (lifetime) [with 344 articles having 47265 citations]

54^th most cited author in Materials Science (lifetime) [with 57804 citations of 505 articles]

54^th most cited paper in Chemistry (2001) [with 5931 citations of an article]

54^th most cited author in Mechanics (2014) [with 2635 citations of 4 articles]

54^th most cited author in Mechanics (lifetime) [with 17457 citations of 49 articles]

55^th most cited author in Chemical Engineering (1976) [with 148 citations of 3 articles]

56^th most cited author in Physical Sciences (2000) [with 5785 citations of 24 articles]

56^th most cited paper in Condensed Matter Physics (1989) [with 534 citations of an article]

57^th most published author in Materials Science (1989) [with 9 articles having 613 citations]

57^th most cited paper in Analytical Chemistry (1978) [with 125 citations of an article]

57^th most cited author in Materials Chemistry (lifetime) [with 15419 citations of 153 articles]

58^th most published author in Materials Chemistry (2005) [with 12 articles having 428 citations]

59^th most cited author in Chemistry (1975) [with 379 citations of 9 articles]

59^th most cited paper in Clinical Biochemistry (1979) [with 38 citations of an article]

60^th most cited paper in Materials Science (1975) [with 353 citations of an article]

60^th most published author in Materials Science (2005) [with 22 articles having 1017 citations]

61^st most cited paper in Analytical Chemistry (1979) [with 148 citations of an article]

62^nd most cited author in Chemical Engineering (1983) [with 257 citations of 5 articles]

62^nd most cited author in Materials Science (2017) [with 5028 citations of 18 articles]

62^nd most cited author in Physical Chemistry (1989) [with 562 citations of 4 articles]

64^th most cited author in Materials Science (1999) [with 2089 citations of 18 articles]

65^th most published author in Chemistry (1999) [with 21 articles having 2120 citations]

66^th most published author in Chemistry (lifetime) [with 805 articles having 110118 citations]

66^th most published author in Analytical Chemistry (1998) [with 6 articles having 143 citations]

69^th most published author in Physical Sciences (1986) [with 11 articles having 398 citations]

70^th most published author in Applied Sciences (2005) [with 17 articles having 679 citations]

70^th most cited paper in Materials Science (2017) [with 5028 citations of an article]

70^th most published author in Chemistry (1986) [with 9 articles having 393 citations]

70^th most cited paper in Applied Physics (2018) [with 1337 citations of an article]

70^th most cited paper in Analytical Chemistry (1975) [with 26 citations of an article]

71^st most cited author in Physical Sciences (2001) [with 5931 citations of 20 articles]

71^st most cited paper in Materials Science (2019) [with 2965 citations of an article]

71^st most cited author in Biochemistry (2012) [with 2599 citations of 2 articles]

72^nd most cited author in Mechanical Engineering (2014) [with 2601 citations of 3 articles]

72^nd most cited paper in Spectroscopy (1995) [with 232 citations of an article]

73^rd most cited paper in Chemical Engineering (2012) [with 6377 citations of an article]

73^rd most cited paper in Materials Chemistry (1986) [with 131 citations of an article]

74^th most cited author in Materials Science (1976) [with 203 citations of 7 articles]

74^th most cited author in Spectroscopy (1995) [with 232 citations of 4 articles]

75^th most cited paper in Chemical Engineering (1983) [with 257 citations of an article]

75^th most published author in Chemical Engineering (2003) [with 10 articles having 972 citations]

75^th most cited paper in Mechanics (2018) [with 2281 citations of an article]

75^th most cited paper in Mechanics of Materials (2018) [with 2281 citations of an article]

76^th most cited paper in Electrochemistry (1995) [with 228 citations of an article]

77^th most cited author in Biochemistry (2019) [with 1707 citations of 3 articles]

77^th most cited paper in Materials Chemistry (1976) [with 45 citations of an article]

77^th most cited author in Materials Chemistry (1999) [with 942 citations of 8 articles]

78^th most published author in Chemical Engineering (2001) [with 9 articles having 3929 citations]

79^th most cited paper in Energy (2010) [with 1099 citations of an article]

79^th most published author in Chemistry (1991) [with 12 articles having 232 citations]

81^st most cited paper in Electrochemistry (1987) [with 44 citations of an article]

82^nd most cited author in Chemical Engineering (1978) [with 128 citations of 8 articles]

82^nd most cited author in Inorganic Chemistry (lifetime) [with 15542 citations of 156 articles]

84^th most published author in Chemistry (2002) [with 24 articles having 1557 citations]

85^th most cited paper in Mechanical Engineering (2014) [with 2601 citations of an article]

86^th most cited author in Condensed Matter Physics (2018) [with 1414 citations of 6 articles]

86^th most cited paper in Biochemistry (2012) [with 2599 citations of an article]

87^th most cited author in Electrochemistry (1995) [with 228 citations of 3 articles]

88^th most cited paper in Physical Sciences (2015) [with 14921 citations of an article]

88^th most cited paper in Chemical Engineering (1976) [with 148 citations of an article]

88^th most cited author in Inorganic Chemistry (1999) [with 942 citations of 8 articles]

88^th most cited author in Condensed Matter Physics (1989) [with 534 citations of 5 articles]

89^th most cited paper in Mechanical Engineering (2018) [with 2237 citations of an article]

90^th most cited author in Energy (2011) [with 1694 citations of 1 articles]

90^th most cited paper in Materials Science (1989) [with 613 citations of an article]

90^th most cited paper in Chemistry (2017) [with 7417 citations of an article]

91^st most cited author in Life Sciences (2014) [with 6242 citations of 4 articles]

91^st most cited paper in Inorganic Chemistry (1986) [with 131 citations of an article]

91^st most published author in Materials Chemistry (1999) [with 8 articles having 942 citations]

92^nd most cited paper in Applied Sciences (2015) [with 9021 citations of an article]

92^nd most published author in Chemical Engineering (2006) [with 11 articles having 524 citations]

92^nd most cited paper in Condensed Matter Physics (2018) [with 1414 citations of an article]

95^th most cited author in Applied Sciences (1975) [with 130 citations of 4 articles]

95^th most cited author in Mechanical Engineering (lifetime) [with 17684 citations of 47 articles]

95^th most cited author in Materials Science (2014) [with 5039 citations of 14 articles]

95^th most cited author in Chemistry (1976) [with 282 citations of 11 articles]

95^th most cited paper in Condensed Matter Physics (1974) [with 56 citations of an article]

96^th most cited paper in Materials Science (2000) [with 3306 citations of an article]

96^th most cited author in Condensed Matter Physics (1999) [with 998 citations of 6 articles]

97^th most cited author in Energy (2012) [with 1574 citations of 3 articles]

97^th most published author in Materials Science (2002) [with 17 articles having 1082 citations]

97^th most published author in Materials Science (lifetime) [with 505 articles having 57804 citations]

97^th most cited paper in Applied Physics (lifetime) [with 13875 citations of an article]

98^th most cited paper in Chemical Engineering (1975) [with 130 citations of an article]

Rankings

Scientometrics

Citing Bodies

Mietek Jaroniec