NLGI Spokesman

Quartiles

The set of journals have been ranked according to their SJR and divided into four equal groups, four quartiles. Q1 (green) comprises the quarter of the journals with the highest values, Q2 (yellow) the second highest values, Q3 (orange) the third highest values and Q4 (red) the lowest values.

Category	Year	Quartile
Energy Engineering and Power Technology	1999	Q2
Energy Engineering and Power Technology	2000	Q1
Energy Engineering and Power Technology	2001	Q2
Energy Engineering and Power Technology	2002	Q2
Energy Engineering and Power Technology	2003	Q2
Energy Engineering and Power Technology	2004	Q2
Energy Engineering and Power Technology	2005	Q3
Energy Engineering and Power Technology	2006	Q3
Energy Engineering and Power Technology	2007	Q3
Energy Engineering and Power Technology	2008	Q4
Energy Engineering and Power Technology	2009	Q3
Energy Engineering and Power Technology	2010	Q3
Energy Engineering and Power Technology	2011	Q4
Energy Engineering and Power Technology	2012	Q4
Energy Engineering and Power Technology	2013	Q4
Energy Engineering and Power Technology	2014	Q4
Energy Engineering and Power Technology	2015	Q4
Energy Engineering and Power Technology	2016	Q4
Energy Engineering and Power Technology	2017	Q4
Energy Engineering and Power Technology	2018	Q4
Energy Engineering and Power Technology	2019	Q4
Materials Chemistry	1999	Q3
Materials Chemistry	2000	Q2
Materials Chemistry	2001	Q3
Materials Chemistry	2002	Q3
Materials Chemistry	2003	Q4
Materials Chemistry	2004	Q3
Materials Chemistry	2005	Q4
Materials Chemistry	2006	Q4
Materials Chemistry	2007	Q4
Materials Chemistry	2008	Q4
Materials Chemistry	2009	Q4
Materials Chemistry	2010	Q4
Materials Chemistry	2011	Q4
Materials Chemistry	2012	Q4
Materials Chemistry	2013	Q4
Materials Chemistry	2014	Q4
Materials Chemistry	2015	Q4
Materials Chemistry	2016	Q4
Materials Chemistry	2017	Q4
Materials Chemistry	2018	Q4
Materials Chemistry	2019	Q4
Mechanical Engineering	1999	Q3
Mechanical Engineering	2000	Q2
Mechanical Engineering	2001	Q3
Mechanical Engineering	2002	Q2
Mechanical Engineering	2003	Q3
Mechanical Engineering	2004	Q2
Mechanical Engineering	2005	Q4
Mechanical Engineering	2006	Q3
Mechanical Engineering	2007	Q3
Mechanical Engineering	2008	Q4
Mechanical Engineering	2009	Q3
Mechanical Engineering	2010	Q4
Mechanical Engineering	2011	Q4
Mechanical Engineering	2012	Q4
Mechanical Engineering	2013	Q4
Mechanical Engineering	2014	Q4
Mechanical Engineering	2015	Q4
Mechanical Engineering	2016	Q4
Mechanical Engineering	2017	Q4
Mechanical Engineering	2018	Q4
Mechanical Engineering	2019	Q4
Surfaces, Coatings and Films	1999	Q3
Surfaces, Coatings and Films	2000	Q2
Surfaces, Coatings and Films	2001	Q3
Surfaces, Coatings and Films	2002	Q3
Surfaces, Coatings and Films	2003	Q3
Surfaces, Coatings and Films	2004	Q3
Surfaces, Coatings and Films	2005	Q4
Surfaces, Coatings and Films	2006	Q4
Surfaces, Coatings and Films	2007	Q3
Surfaces, Coatings and Films	2008	Q4
Surfaces, Coatings and Films	2009	Q3
Surfaces, Coatings and Films	2010	Q4
Surfaces, Coatings and Films	2011	Q4
Surfaces, Coatings and Films	2012	Q4
Surfaces, Coatings and Films	2013	Q4
Surfaces, Coatings and Films	2014	Q4
Surfaces, Coatings and Films	2015	Q4
Surfaces, Coatings and Films	2016	Q4
Surfaces, Coatings and Films	2017	Q4
Surfaces, Coatings and Films	2018	Q4
Surfaces, Coatings and Films	2019	Q4

SJR

The SJR is a size-independent prestige indicator that ranks journals by their 'average prestige per article'. It is based on the idea that 'all citations are not created equal'. SJR is a measure of scientific influence of journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from It measures the scientific influence of the average article in a journal, it expresses how central to the global scientific discussion an average article of the journal is.

Year	SJR
1999	0.182
2000	0.450
2001	0.211
2002	0.262
2003	0.165
2004	0.208
2005	0.105
2006	0.118
2007	0.143
2008	0.100
2009	0.139
2010	0.123
2011	0.100
2012	0.110
2013	0.111
2014	0.100
2015	0.100
2016	0.101
2017	0.111
2018	0.101
2019	0.102

Total Documents

Evolution of the number of published documents. All types of documents are considered, including citable and non citable documents.

Year	Documents
1999	57
2000	25
2001	47
2002	55
2003	59
2004	60
2005	54
2006	70
2007	68
2008	31
2009	39
2010	30
2011	34
2012	36
2013	34
2014	38
2015	0
2016	0
2017	0
2018	0
2019	0

Citations per document

This indicator counts the number of citations received by documents from a journal and divides them by the total number of documents published in that journal. The chart shows the evolution of the average number of times documents published in a journal in the past two, three and four years have been cited in the current year. The two years line is equivalent to journal impact factor ™ (Thomson Reuters) metric.

Cites per document	Year	Value
Cites / Doc. (4 years)	1999	0.169
Cites / Doc. (4 years)	2000	0.164
Cites / Doc. (4 years)	2001	0.159
Cites / Doc. (4 years)	2002	0.296
Cites / Doc. (4 years)	2003	0.103
Cites / Doc. (4 years)	2004	0.156
Cites / Doc. (4 years)	2005	0.167
Cites / Doc. (4 years)	2006	0.118
Cites / Doc. (4 years)	2007	0.152
Cites / Doc. (4 years)	2008	0.028
Cites / Doc. (4 years)	2009	0.103
Cites / Doc. (4 years)	2010	0.091
Cites / Doc. (4 years)	2011	0.071
Cites / Doc. (4 years)	2012	0.104
Cites / Doc. (4 years)	2013	0.079
Cites / Doc. (4 years)	2014	0.030
Cites / Doc. (4 years)	2015	0.007
Cites / Doc. (4 years)	2016	0.009
Cites / Doc. (4 years)	2017	0.042
Cites / Doc. (4 years)	2018	0.053
Cites / Doc. (4 years)	2019	0.000
Cites / Doc. (3 years)	1999	0.169
Cites / Doc. (3 years)	2000	0.187
Cites / Doc. (3 years)	2001	0.133
Cites / Doc. (3 years)	2002	0.264
Cites / Doc. (3 years)	2003	0.126
Cites / Doc. (3 years)	2004	0.112
Cites / Doc. (3 years)	2005	0.178
Cites / Doc. (3 years)	2006	0.092
Cites / Doc. (3 years)	2007	0.141
Cites / Doc. (3 years)	2008	0.021
Cites / Doc. (3 years)	2009	0.118
Cites / Doc. (3 years)	2010	0.109
Cites / Doc. (3 years)	2011	0.070
Cites / Doc. (3 years)	2012	0.117
Cites / Doc. (3 years)	2013	0.050
Cites / Doc. (3 years)	2014	0.019
Cites / Doc. (3 years)	2015	0.009
Cites / Doc. (3 years)	2016	0.014
Cites / Doc. (3 years)	2017	0.053
Cites / Doc. (3 years)	2018	0.000
Cites / Doc. (3 years)	2019	0.000
Cites / Doc. (2 years)	1999	0.180
Cites / Doc. (2 years)	2000	0.163
Cites / Doc. (2 years)	2001	0.110
Cites / Doc. (2 years)	2002	0.278
Cites / Doc. (2 years)	2003	0.049
Cites / Doc. (2 years)	2004	0.070
Cites / Doc. (2 years)	2005	0.176
Cites / Doc. (2 years)	2006	0.061
Cites / Doc. (2 years)	2007	0.161
Cites / Doc. (2 years)	2008	0.014
Cites / Doc. (2 years)	2009	0.141
Cites / Doc. (2 years)	2010	0.100
Cites / Doc. (2 years)	2011	0.101
Cites / Doc. (2 years)	2012	0.094
Cites / Doc. (2 years)	2013	0.071
Cites / Doc. (2 years)	2014	0.014
Cites / Doc. (2 years)	2015	0.014
Cites / Doc. (2 years)	2016	0.026
Cites / Doc. (2 years)	2017	0.000
Cites / Doc. (2 years)	2018	0.000
Cites / Doc. (2 years)	2019	0.000

Total Cites

Self-Cites

Evolution of the total number of citations and journal's self-citations received by a journal's published documents during the three previous years.
Journal Self-citation is defined as the number of citation from a journal citing article to articles published by the same journal.

Cites	Year	Value
Self Cites	1999	3
Self Cites	2000	8
Self Cites	2001	10
Self Cites	2002	9
Self Cites	2003	3
Self Cites	2004	6
Self Cites	2005	8
Self Cites	2006	5
Self Cites	2007	8
Self Cites	2008	1
Self Cites	2009	9
Self Cites	2010	9
Self Cites	2011	4
Self Cites	2012	6
Self Cites	2013	5
Self Cites	2014	1
Self Cites	2015	0
Self Cites	2016	0
Self Cites	2017	0
Self Cites	2018	0
Self Cites	2019	0
Total Cites	1999	13
Total Cites	2000	20
Total Cites	2001	14
Total Cites	2002	34
Total Cites	2003	16
Total Cites	2004	18
Total Cites	2005	31
Total Cites	2006	16
Total Cites	2007	26
Total Cites	2008	4
Total Cites	2009	20
Total Cites	2010	15
Total Cites	2011	7
Total Cites	2012	12
Total Cites	2013	5
Total Cites	2014	2
Total Cites	2015	1
Total Cites	2016	1
Total Cites	2017	2
Total Cites	2018	0
Total Cites	2019	0

External Cites per Doc

Cites per Doc

Evolution of the number of total citation per document and external citation per document (i.e. journal self-citations removed) received by a journal's published documents during the three previous years. External citations are calculated by subtracting the number of self-citations from the total number of citations received by the journal’s documents.

Cites	Year	Value
External Cites per document	1999	0.130
External Cites per document	2000	0.112
External Cites per document	2001	0.038
External Cites per document	2002	0.194
External Cites per document	2003	0.102
External Cites per document	2004	0.075
External Cites per document	2005	0.132
External Cites per document	2006	0.064
External Cites per document	2007	0.098
External Cites per document	2008	0.016
External Cites per document	2009	0.065
External Cites per document	2010	0.043
External Cites per document	2011	0.030
External Cites per document	2012	0.058
External Cites per document	2013	0.000
External Cites per document	2014	0.010
External Cites per document	2015	0.009
External Cites per document	2016	0.014
External Cites per document	2017	0.053
External Cites per document	2018	0
External Cites per document	2019	0
Cites per document	1999	0.169
Cites per document	2000	0.187
Cites per document	2001	0.133
Cites per document	2002	0.264
Cites per document	2003	0.126
Cites per document	2004	0.112
Cites per document	2005	0.178
Cites per document	2006	0.092
Cites per document	2007	0.141
Cites per document	2008	0.021
Cites per document	2009	0.118
Cites per document	2010	0.109
Cites per document	2011	0.070
Cites per document	2012	0.117
Cites per document	2013	0.050
Cites per document	2014	0.019
Cites per document	2015	0.009
Cites per document	2016	0.014
Cites per document	2017	0.053
Cites per document	2018	0.000
Cites per document	2019	0.000

% International Collaboration

International Collaboration accounts for the articles that have been produced by researchers from several countries. The chart shows the ratio of a journal's documents signed by researchers from more than one country; that is including more than one country address.

Year	International Collaboration
1999	0.00
2000	8.00
2001	0.00
2002	1.82
2003	6.78
2004	11.67
2005	1.85
2006	7.14
2007	5.88
2008	0.00
2009	0.00
2010	10.00
2011	5.88
2012	0.00
2013	2.94
2014	0.00
2015	0
2016	0
2017	0
2018	0
2019	0

Citable documents

Non-citable documents

Not every article in a journal is considered primary research and therefore "citable", this chart shows the ratio of a journal's articles including substantial research (research articles, conference papers and reviews) in three year windows vs. those documents other than research articles, reviews and conference papers.

Documents	Year	Value
Non-citable documents	1999	3
Non-citable documents	2000	31
Non-citable documents	2001	32
Non-citable documents	2002	55
Non-citable documents	2003	28
Non-citable documents	2004	64
Non-citable documents	2005	75
Non-citable documents	2006	103
Non-citable documents	2007	104
Non-citable documents	2008	109
Non-citable documents	2009	84
Non-citable documents	2010	47
Non-citable documents	2011	18
Non-citable documents	2012	13
Non-citable documents	2013	30
Non-citable documents	2014	20
Non-citable documents	2015	18
Non-citable documents	2016	0
Non-citable documents	2017	0
Non-citable documents	2018	0
Non-citable documents	2019	0
Citable documents	1999	74
Citable documents	2000	76
Citable documents	2001	73
Citable documents	2002	74
Citable documents	2003	99
Citable documents	2004	97
Citable documents	2005	99
Citable documents	2006	70
Citable documents	2007	80
Citable documents	2008	83
Citable documents	2009	85
Citable documents	2010	91
Citable documents	2011	82
Citable documents	2012	90
Citable documents	2013	70
Citable documents	2014	84
Citable documents	2015	90
Citable documents	2016	72
Citable documents	2017	38
Citable documents	2018	0
Citable documents	2019	0

Cited documents

Uncited documents

Ratio of a journal's items, grouped in three years windows, that have been cited at least once vs. those not cited during the following year.

Documents	Year	Value
Uncited documents	1999	67
Uncited documents	2000	96
Uncited documents	2001	94
Uncited documents	2002	114
Uncited documents	2003	113
Uncited documents	2004	149
Uncited documents	2005	150
Uncited documents	2006	162
Uncited documents	2007	163
Uncited documents	2008	188
Uncited documents	2009	154
Uncited documents	2010	126
Uncited documents	2011	93
Uncited documents	2012	94
Uncited documents	2013	96
Uncited documents	2014	102
Uncited documents	2015	107
Uncited documents	2016	71
Uncited documents	2017	36
Uncited documents	2018	0
Uncited documents	2019	0
Cited documents	1999	10
Cited documents	2000	11
Cited documents	2001	11
Cited documents	2002	15
Cited documents	2003	14
Cited documents	2004	12
Cited documents	2005	24
Cited documents	2006	11
Cited documents	2007	21
Cited documents	2008	4
Cited documents	2009	15
Cited documents	2010	12
Cited documents	2011	7
Cited documents	2012	9
Cited documents	2013	4
Cited documents	2014	2
Cited documents	2015	1
Cited documents	2016	1
Cited documents	2017	2
Cited documents	2018	0
Cited documents	2019	0