SCIENTIFIC WRITING. Based mainly on the AIP Style guide and The Technical Writer s Handbook by Matt Young.
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1 SCIENTIFIC WRITING Based mainly on the AIP Style guide and The Technical Writer s Handbook by Matt Young.
2 OVERVIEW The structure of scientific reports Writing with clarity Scientific style conventions Mandatory style conventions Debated style conventions
3 The Structure of the Report Title The title should be descriptive and informative. Abstract The abstract should state very concisely (usually in one paragraph) the scope and nature of the subject discussed, the basic method or approach, and a summary of the major results. The abstract should stand alone without reference to the rest of the paper. Introduction The introduction should outline for the reader exactly what is to be discussed in the paper, the purpose of the work, and a brief history of previous work relevant to the investigation. It gives us the big picture, so that we have enough context to understand the Theory and Procedure sections. Theory Experiments are designed and performed within a theoretical context. Describe this context here and summarize, motivate, or derive the relevant equations.
4 Procedure Briefly describe what you did in full sentences and complete paragraphs. Don t write this section as a numbered list of steps, and don t imitate a lab manual. Use the past tense. Figures of the apparatus, including either schematics or digital photographs, are often valuable here. Focus on the essence of the experiment, not on the knobs that you turned. Results and Analysis Concisely summarize your results and discuss them. This section will probably include plots and tables to display your results. Talk the reader through the results -- explain, explain, explain! Talk the reader through the important things to notice when looking at the figure. Plots and tables do not stand alone; each one must be discussed in the text. All graphs, figures, and tables must be labeled and captioned. Conclusion or Summary Tell the reader again whatever you want them to remember. Draw what conclusions you can based on your data. Uncertainty should normally be discussed. In some cases you may have to say that no conclusions can yet be drawn from your data. Acknowledgments, References, Appendices
5 Before beginning to write Analyze the problem: Exactly what information do I wish to present in this paper? For what specific group of readers am I writing? What background information can I assume these readers have? What is the most logical sequence in which I should present the information to the readers?
6 General rules for writing BE CLEAR Consider the beauty and efficiency of the simple declarative sentence as a medium for communicating scientific information. BE CONCISE Avoid idle words; Make every word count. BE COMPLETE Do not assume your reader has all the background information you have about your subject matter. Make sure your argument is complete and logical. Avoid jargon. BE SELF-CRITICAL Put yourself constantly in the place of your reader. Ask yourself Is there any way in which this passage could be misunderstood by someone reading it for the first
7 The value of clear writing I personally believe that most sloppy writing is just sloppy thinking made manifest, and that by focusing on writing better, scientists become better scientists, too. Writing disciplines your mind, and the act of reducing amorphous thoughts to structured, formal language crystallizes your thinking in a way that nothing else can. Celia Elliott, Science Writer, UIUC
8 WRITING WITH CLARITY
9 YOUNG S FIRST RULE
10 Write the way you talk; then polish.
11 DEAD WORDS I have made this letter longer than usual, only because I have not had the time to make it shorter. Blaise Pascal If I had more time, this letter would be shorter. Voltaire
12 Orwell said, If it is possible to cut a word out, always cut it out. Today we might cut the two instances of out from his sentence, but they are not exactly instances of dead or meaningless words. Dead words are phrases like it is seen that, it is well known that, it is found that, recall that, and note that and its partner it should be noted that. These words have no real meaning. When they are used to excess, they do not do the job they are supposed to do: to highlight points you want to make strongly. The best way to highlight some point is to do it with your writing or your punctuation. For example, instead of writing it should be pointed out that all the time, find the sentence you really want to stand out, polish it, and give it a paragraph all its own. That probably makes it stand out better than a handful of dead words and saves typesetting besides.
13 Examples: From The Dictionary of Concise Writing: She said she was 'in the process of cleaning the house.' How is that different from simply 'cleaning the house'?'' I thought, an overwhelming majority of -> most to a certain extent -> in part is of the opinion that -> believes This is a result of the fact that aluminum and copper plates of different thicknesses were used in this particular study with materials on hand. This is because aluminum and copper plates of different thicknesses were used in this particular study with materials on hand.
14 FALSE ELEGANCE
15 False elegance is using long or pretentious words where common words exist. For example, using utilization for use, in view of the fact that for because, and therein for in it are examples of false elegance. Much advantage accrues to this method from the availability of fluorescent dyes is a falsely elegant way to say Fluorescent dyes have proved valuable to us.
16 Other writers achieve false elegance by elegant variation, or changing words to avoid repeating a word within the same sentence or paragraph. Indeed, bad writers often go to great lengths to avoid repetition. Why? You don t get variety, say, by switching to fabricate just because you have just used build, or switching to employ because you have just used use. Use the word that sounds most natural to you, and don t worry about getting variety by an artificial device. We calculated the mean and standard deviation; the average was Average and mean are synonyms here but why change terminology in mid-sentence? We calculated the mean and standard deviation; the mean was 17.0.
17 ''Never use a long word when a diminutive one will do.'' -William Safire
18 VAGUE WORDS, VOGUE WORDS
19 Sometimes difficult to distinguish. A vague word is a word that does not have a precise meaning or is not precise enough for a given application. Typical vague words are nice, fine, really, good, bad, and, in many contexts, important, kind, type, character, relative, appreciable, or device. If you use an adjective, for example, but always have to intensify it with a word like actually, very, totally, extremely, or exceptionally, drop the intensifier or look for a more precise adjective that means what you want to say.
20 A word like apparatus or device can also be a vague word. For example, do not write We used a device that dispersed the light into its constituent colors. In this context, device is too vague; tell us what kind of device: We used a prism spectrometer to disperse the light into its constituent colors. Words like imperative and essential (and their adverbs) are vogue words, that is, words that are in style and have lost much of their strength. For example, essential does not mean just important; it means of the utmost importance. If you have to intensify it with extremely, you are using a vogue word that has lost much of its force...
21 Adjectives like appreciable, relative and reasonable are also vogue words and may be vague. Relatively large in microscopy is not even significant in astronomy. Therefore, don t write The surface feature was relatively large, but, rather, something like The surface feature was several kilometers across or The surface feature was easily resolved by the telescope.
22 SCIENTIFIC STYLE (MANDATORY CONVENTIONS!)
23 EQUATIONS
24 Very short equations [with italicized variables] may be used in sentences: Points r < a are in the core of the fiber. The line extends from x = a to x = b. Longer equations are given lines of their own and usually numbered along the right margin. These equations are also best treated as parts of sentences and, in most publications, are also punctuated as such: The lens equation is 1 / L - 1 / L = 1 / f, (23) where f is the focal length.
25 NUMBERS IN SENTENCES
26 There is an arbitrary rule that you spell numbers less than or equal to ten; some people add to this round numbers such as twenty, thirty, and one hundred. (Others spell unity and zero as well.) In technical writing, the rule applies only to numbers used to indicate quantity. Thus, we write two, 40 khz transmitters, but a factor of 3. Seeing a factor of three in a manuscript always makes me want to ask, A factor of three what? Similarly, I would not write Frame one any more than I would write Figure one; write Frame 1. Some publications that require hyphenation would hyphenate something like 30-cm radius, since 30-cm is a compound modifier.
27 Many countries use a comma, not a dot, as the decimal marker. In numbers with lots of digits, therefore, separate the digits into groups of three and leave spaces, not commas, between groups. Count both ways from the decimal point and write, for example, or , but not 299,792,458 or 5.640,51. Leave out the space when only four digits are involved (1066 not 1 066), unless the number appears in a table with longer numbers.
28 SI UNITS
29 Write the units in Roman type, not italic. (Variables are italicized.) Thus, 6 m indicates a length of 6 meters, while 6 m indicates a mass a factor of 6 larger than the mass m. When you spell the name of an SI unit fully--hertz, decibel, mole, meter--do not capitalize it even if the unit is named after a person (except at the beginning of a sentence or where you would otherwise capitalize). When you abbreviate a unit--hz, db, mol, m--capitalize the abbreviation only when the unit is named after a person. The International System calls for a space between the number and a unit or its abbreviation. That is, write 9.8 cm, not 9.8cm.
30 Avoid abbreviating units when they are not associated with a number: To cool an atom from 300 K to mk temperatures requires scattering events. Rewrite to spell out the unit completely: To cool an atom from 300 K to millikelvin temperatures requires scattering events.
31 NAKED DECIMAL POINT
32 A decimal point is a little thing; it can easily get lost. Do not leave your decimal points naked but precede them with a digit. That is, when reporting numbers less than 1 write them with a leading 0: , not.7071
33 OTHER CONVENTIONS
34 Contractions: Don t use em in technical writing. Uncertainty: Guidelines are in the Junior IS manual Only 1 sig fig in the uncertainty Uncertainty and value end at the same place Same scientific notation exponent for both values References: Again, guidelines are in the manual. Note that borrowing a figure requires more explicit citation than borrowing general ideas. I do not encourage indiscriminate copying of images from the web.
35 SCIENTIFIC STYLE (DEBATABLE CONVENTIONS!)
36 Passive voice First-person Gender neutral language (he, he or she, they)
37 EXAMPLES
38 Sample Abstract The purpose of this experiment is to create and study chaos in a mechanical system. The specific system studied herein is that of a forced damped harmonic oscillator with a bi-stable equilibrium. This system can act chaotically when conditions are set up in some ways, while it exhibits perfectly ordinary periodic oscillations when the conditions are set up in other ways. In this report, several different ways by examining different graphs of the data, including phase diagrams and Poincare plots, are used to show that the system exhibit chaotic motion. It is also informative to examine the Fourier transforms of the data to see the dependence of the chaotic system on the driving frequency. Fourier transforms of the data were also taken to show that the driving frequency has a significant effect on the chaotic oscillations of the system.
39 Sample Conclusion Chaos was observed in the mechanical system for runs B and C. This was seen in the erratic behavior of the angular position vs. time graph. The complete filling of the phase space on the phase diagram indicated chaos was present. The swirl shape of the Poincare plot was indicative of chaotic motion. Finally the divergence due to initial conditions observed between runs B and C constitutes fairly solid evidence that the parameters set for those runs do induce chaos. We also observed that while the driving frequency was very important to the low amplitude steady state of Run B, it was not the most important oscillation frequency during the high amplitude chaotic state of the same run. The Fourier transform of the whole of Run B shows that it has contributions from a large number of frequencies, although the driving frequency is the most prevalent, which further indicates that the system is experiencing erratic and chaotic behavior.
40 ADDITIONAL RESOURCES
41 Ms. Particular Resources from Celia Elliott, University of Illinois Physics Dept
42 Ms. Particular Writing well is not an art, it's a craft. It requires learning basic techniques, practicing them over and over, getting feedback, and writing with the expectation that you'll rewrite, sometimes many times. So keep practicing! Celia Elliott, Science Writer, UIUC
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