What does Nafta Journal publish?
Nafta Journal publishes yet unpublished original
scientific papers and reports, interesting literary reviews, and
discussions dealing with current topics in petroleum exploration,
exploitation and processing, the petrochemical industry, economics
in the petroleum industry and related areas.
Papers are published in the Croatian and/or
English language. Priority is given to articles written in English.
Principally, the paper should present the integral text intended for
publishing. A cover letter enclosed with the manuscript should
contain the author's data (full name, address, academic title,
profession, and phone number of the institute or company of
The manuscripts are sent to the following
address: Nafta Journal , 10000 Zagreb , Savska c. 64/IV, R. Croatia,
to the attention of the Editor-in-Chief.
Category of papers
Papers are categorized as follows:
- Original scientific paper
- Preliminary communication
- Professional paper
- Conference paper
- Presentation, social news, note, book review,
survey of foreign technical literature, and similar.
Original scientific paper
Contains yet unpublished results of an original
research. It should be elaborated in sufficient detail enabling a
qualified scientist, based on the information received, to:
• reproduce the experiment and obtain the
described results with equal precision or within an error margin as
specified by the author;
• repeat the author's observations,
calculations or theoretic deductions, and arrive to similar
Contains new scientific knowledge and results
that require immediate publication. The paper is required to contain
at least one new fact, scientific information, but it should not
contain sufficient detail enabling the reader to test the described
Contains a global review of a specific field or a
problem, which has been published previously but which is here
integrated, analyzed, suitably presented, and discussed.
Embraces useful articles dealing with
professional fields and engaged in topics unrelated to original
research. This means that the subject does not necessarily represent
news on a global scale. For instance, this refers to the
reproduction of well-known research work that represents valuable
material in terms of expanding knowledge and adjusting the original
research to specific industrial and scientific requirements.
Represents a category, which as a rule, shall be
published only if not already published in the proceedings.
A manuscript is submitted in duplicate (one
original and one copy), containing the following: 1) work title; 2)
full name(s) of author(s); 3) textual part, which as a rule consists
of an introduction, experimental part, review of results, analysis
of results, and a conclusion; 4) list of references; 5) tables; 6)
figures, photos, and/or equations; 7) figure and/or photo captions;
8) acknowledgements (if any); 9) abstract; 10) extended abstract.
The work title should be concise. The author(s)
full name(s) should be written underneath the work title.
Main elements – layout and structure of
The Editor's office recommends that an original
scientific paper reports the results of one's own investigation, and
be presented in the following manner:
(a) Introduction – Stating the subject of
the paper, its scope and objectives, as well as including an
overview of earlier research published in scientific literature.
When a well-known subject is involved,
particularly when similar papers have already been published in the
Nafta Journal, the introduction and the list of references should be
as brief as possible.
In the description of earlier research work, the
references should be in chronological order so as to give an idea of
the history and development of the field involved.
(b) Experimental – Experiments and
measurements should be described in a manner enabling the results to
be readily reproduced. When commercial or earlier described
instruments are involved, it is necessary to specify the references
and conditions in which the experiments were performed (scale). If
proper experimental procedure has been developed, it should be
presented in the form of prescription, giving all details and
easy-to-consult drawings and/or drawings of constructed
(c) Results – The results should be
presented in well laid out tables or charts. The charts should
record all the results obtained by experiments. Statistical
processing of the results is recommended.
(d) Discussion – Analysis of the obtained
results, comparison with previously published data, established
regularities, comments on errors and precision of measurement. In
some cases, if the author finds it convenient, the results and
discussion may be presented side by side (simultaneously), although
it is better to present them separately.
(e) Conclusion – Contains an overview of
the most important results. It should be written in a manner
enabling the reader, by only reading the Conclusion, to form a
general idea as to the value of the work and his interests related
to it, and to what purpose he may use it. The conclusion may also be
written simultaneously with the discussion, but here the rule also
applies that it is best to write it separately. The conclusion may
also be published at the beginning of the article, as is recently
the case in certain US magazines.
(f) Key words – The author him/herself
should establish the most characteristic words contained in the
article. The author should write three to six key words, indicating
the very essence of the article, both in Croatian (if possible) and
English. For example, an article entitled “Characteristic Trends of
Drilling Costs in the Dinarides” has the following key words:
Bušenje – Drilling
Troškovi – Costs
Dinaridi – Dinarides
(g) Acknowledgements (if any) – follow at
the end of the article but precede References.
(h) References – Correct citation of
references should be dealt with carefully. References should be
typed on a separate page and each reference numbered in order of
appearance in the text.
(i) Citation of journals – The citation
should read in the following order: author's surname, author's
first-name initial(s), comma , name of the journal or its
international abbreviation, space (without a comma), volume
or annual file ( underlined or bold ), comma ,
page number, year in brackets , full stop . E.g.:
Skerlev P., Velebir K., Nafta ( Zagreb ) 29 , 24
If a journal has separate page numbering for each
issue of the same annual file, the number of the journal should be
indicated in brackets following the volume, otherwise it will not be
unmistakably identified. It should be mentioned that in petroleum
literature there are many similar journals and such errors in
citation are very common. Thus, the correct way to write the
Jelinek J., Hlavacek V., Hydrocarbon Processing
50 (8), 135 (1971).
In order to help the authors in their work, at
the end of these instructions we shall quote a list of the most
frequently cited journals dealing with petroleum industry along with
the relevant abbreviations. If two different journals share the same
title, then we should write in brackets the place of publication.
This is precisely the case with our journal. The correct citation
should therefore read as follows: Nafta ( Zagreb ) to be
distinguished from Nafta ( Katowice ).
(j) Citation of books - Books should be
cited as follows: author's surname, author's first-name initials,
book title, publisher, place of publication, year of publication,
page abbreviation, page number (commas are placed as shown in the
example). E.g.: King C.J., Separation Processes, McGraw-Hill , New
York , 1980. p. 59-68.
(k) Citation of patents - The details
should be written in the following order: author's surname, author's
first-name initials, in brackets the company in whose name the
patent is registered (or first the name of the company, and then of
the inventor's dependent on who the patentee is), abbreviation of
the country of patent registration, patent number, date of
publication, date as of which the patent is effective (priority
date), number of pages. If the author has not had a letter patent
submitted to him, then the source is quoted (which in most cases is
the reference journal). For example:
Heller G.L. and Cole L.C.
(to Columbian Carbon Co.) U.S.3,079,239 Feb. 26, 1963 , Appl. Aug.
12, 1960 ; 11 pp. or
Phillips Petroleum Co. (By L.W. Pollock). Ger
1,130,100 May 24, 1962 ; Appl. June 19, 1950 ; 7 pp. cited after
C.A. (1963) 402 b
(l) Miscellaneous - Congressional
communications, internal communications from individual companies,
off-prints and similar, should be cited in as much detail as
possible. This refers especially to data on the publisher and the
date of issue, and in distinction from other references it should
also include the title. For example:
Parker B., Structural
Features and Hydrocarbon Deposits on the Mackenzie Delta, World
Petrol. Congr. Proc., 9th, Tokyo , 1975, Panel Discussion, p. 5.
(m) Abstract – Should be brief and
informative. It points out conclusions for each new piece of
information the paper supplies. This will help the reader to decide
promptly whether he is interested in the relevant article. An
abstract (as well as the article) is written in the third person and
in connected writing, in the form of a composition (not a list of
titles). It should be clearly phrased, readable, and readily
understandable without having to refer to the text of the original
article. It should not include equations or references, and it
should have a maximum of 500 characters.
The Nafta Journal
publishes abstracts both in Croatian and English (English abstracts
are translated into Croatian on the journal's account). For papers
that do not supply specific new results (referential papers,
historical papers, reviews), it is sufficient to write an abstract
indicating the topic of the paper in one or two sentences. For
N.N., Recent methods for determination of
hydrocarbon structure. The article supplies a list of literature
dealing with analytical methods for determination of hydrocarbon
structure in oil fractions, quoting 42 references.
And finally, the abstract should include the
title of the paper (in the language of the abstract), along with the
author's name and surname written underneath the title.
(n) Extended Abstract - Written in English
for a paper prepared in Croatian, and in Croatian for a paper
prepared in English, length 1-2 printed pages. It should be written
in a manner enabling the reader to identify the basic content of the
work, by consulting the English text in the tables and figures etc.,
(of which the text should supply pertinent instructions). This
refers especially to the results of research work and relevant
Units of measurement
When writing a paper we should strictly use
SI-units. The measurements of all relations should be specified.
When dealing with specific nomenclature, we should include a list of
all the symbols and definitions that have been used in the relevant
article, both in English and in the language of the article. The use
of Anglo-American units of measurement may be allowed only where
customary (for example: oil pipeline diameter in inches, capacity of
a refinery in barrels per day). In these cases, we should write the
measurements first in our units and then the Anglo-American units in
External form of the manuscript
The manuscript must be typewritten on one side of
the paper only, on quality, standard-sized paper (A4 - 210 x 297 mm
or similar). The recommended maximum volume of a manuscript is 16
typewritten, double-spaced pages, A4 paper size, with all enclosures
included (figures, tables, references, etc.). One page may have
28-30 typewritten lines. The first page of the manuscript should
have a top margin of at least 5 cm (2"), and a left margin of at
least 3.5 cm on every typewritten page for possible symbols and for
the copy editor to enter necessary instructions. Each page of the
manuscript should be numbered, i.e. marked with an ordinal number
starting from l.
Tables should be concise but only to the extent
that they ensure quick comprehension of the data and easy reference.
For the same reason, vertical lines should be avoided in a table.
Do not write the same data both in tables and diagrams, except
in rare instances.
Tables should be typed on separate pages,
while there location within the text should be noted at the center
of a separate line, as for example:
(Table No. 6 - Oil Production and
Column headings should be concise and perfectly
clear. Due to limited space frequent use of abbreviations is
necessary, however we prefer the use of standard, generally accepted
abbreviations. If column space is very limited, you may use a symbol
in its heading (e.g. capital letter or a number), but then it should
be explained properly in a legend underneath the table. Each page of
the manuscript containing a table should bear a note at the top, as
for example: Table(s) of article "How to shorten the time...", by
Note: Each table title should be written in
Croatian and English.
Only sharp, clear, well-contrasted,
black-and-white or color photographs will be considered. Photographs
should not be glued in place. They should be sent with the
manuscript as a separate attachment, specifying on the back of the
photo its relevant number (if any), and its caption. The location of
the photo shall be noted within the text as for example:
(Figure No. 4 - View of equipment
for the extraction of oil distillates)
Photographs should not be folded or creased. If
the photographs are sent by mail, make sure to have them packed
properly in order to prevent folding or creasing.
The same rules for photographs also apply to
figures (diagrams, charts, geographical maps and similar). They
should be suitably sized (A4-A5 format) on white drawing or tracing
paper, without lines. Figures (like photographs) may be stereotyped
for printing, reduced or enlarged in relation to the original
drawings. Thus, if the author (i.e. drafter) finds it easier to
construct an enlarged drawing, he is free to do so, but he should
bear in mind that by reducing a drawing by half for instance, not
only shall the lines of the drawing be equally reduced and thinned,
but also the letters and numbers. He should take care that the
letters and numbers are large enough to withstand photographic
reduction and to remain clear and legible. (The letters and numbers
in figures shall conform to applied standards of technical drawing).
The letters should not be drawn manually, but rather with the use of
Figures should include the minimum amount of text
necessary for its comprehension, e.g. the name of the measuring
variable on the x- and y-axes, its dimension, brief explanation of
curves, etc. All remaining information should be presented in a
legend underneath the figure.
Photo and figure captions should
be written in Croatian and English (English captions shall be
translated into Croatian on the journal's account). Figures should
have a minimum margin of 5 cm at all sides for technical symbols and
instructions for the printing-office.
Mathematical and physical symbols in the text
(functions, variables and single values) are printed in Italic
. The author should underline them in pencil in the manuscript
to make them clearly visible for the typesetting process.
Principally, footnotes should be avoided.
Parenthetical observations, data references and similar should be
quoted within the text (e.g. within brackets). Hence, the author
should avoid frequent use of footnotes and apply them only when he
thinks that it is absolutely necessary or unavoidable. In that case,
he should indicate them in the text by an Arabic superscript numeral
placed immediately after the material to be footnoted. For example:
The actual drilling of planned wells 3 proceeded
according to schedule.
The text of the footnote should be typed on a
separate page(s). At the top of the relevant page there should be a
note stating, for example: Footnotes of article "Current Trends in
the Petroleum Industry..." by R. Protic.
The use of standard abbreviations should conform
to established orthographic rules.
When there are frequently
used terms in the article and the author wishes (or should) write
them in their abbreviated form, then at the first use he should
introduce the relevant term by spelling it out in full, followed by
its abbreviation in brackets. For example: Now that furfural solvent
extraction (hereinafter: FSE) has been well-tuned, our
The cover letter sent with the manuscript should
naturally include the following: full name of author, qualifications
(e.g. graduate engineer of technology), scientific title (e.g.
doctor of technical sciences), company name and job title i.e. jobs
and assignments he/she performs, precise address, phone number and
the number of the author's transfer account.
If the paper is
prepared by several authors, the full official addresses of all
authors should be indicated. On a separate sheet indicate the
precise address of the author with whom the editor's office should
The cover letter should also contain the name
of the person to whom the fee should be sent, as well as the fee
Data for establishing universal decimal
It would be very useful if the author him/herself
determines several basic terms of his/her work to be entered into
the universal decimal classification (UDC), which the Nafta Journal
indicates at the end of each scientific paper. This will certainly
help to identify the article more precisely.
Note to authors
Finally, we should point out that authors are
obliged to suggest the category of their article.
The reviewer should also make his own proposal. In controversial
cases, the editor of the department to which the paper has been
classified will decide on the matter.
As a separate enclosure to
the paper, the author(s) of categorized articles may send their
photo (6 x 9 cm), and a brief professional biography to be printed
with the article.
Authors are fully responsible for the contents
of their work. The editorial office will assume, that prior to
submitting their work, the authors have resolved all matters related
to publishing the contents of their work in conformance with the
regulations of the institute and/or company of their employment.
How soon will the work be published will depend
on how well the manuscript is prepared. Principally, articles
requiring major modifications will be returned to the author for
improvement before reviewing/editing.
We would very much appreciate it if the
authors send the article in electronic form (on a disc or CD) along
with the compulsory original and duplicate of the manuscript.