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==Talkback==
==Talkback==
{{talkback|User talk:Colds7ream/List of space stations|ts=17:29, 22 March 2011 (UTC)}}
{{talkback|User talk:Colds7ream/List of space stations|ts=17:29, 22 March 2011 (UTC)}}

== Posting Photos==

Hey, sorry I havent communicated with you about the Spectrum Auction project. Currently, we have an assignment where we have to do random edits on other wiki pages. I chose to update some things about the cast of The Cosby Show but I cant figure out how to add a picture to the biography section (the long box on the right hand side of the pages). I saw the code from the page on the actual show but I dont know how to get the photos to show up on the page Im doing. I would appreciate any help, thanks.

Letia Armstead





== Advice On Undoing an Edit ==
== Advice On Undoing an Edit ==

Revision as of 16:03, 27 March 2011

journals

Hello, N2e. You have new messages at Wikipedia_talk:WikiProject_Academic_Journals#Help.2FFeedback. Headbomb {talk / contribs / physics / books} 06:28, 21 January 2011 (UTC)[reply]

Done. Thanks for the note. N2e (talk) 14:31, 21 January 2011 (UTC)[reply]

A particularly concise and cogent explanation of specific impulse

The following is a comment left in October 2010 on the Talk:Rocket propellant Talk page. I thought it particularly good, and will leave it here in the comments for others to see. Clear, concise, cogent and very helpful to the lay person in getting over the "why is ISP measured in units of seconds" question. Cheers. N2e (talk) 17:08, 25 January 2011 (UTC)[reply]

Specific impulse is the average exhaust velocity divided by the acceleration of gravity, taken to be 9.80665 meters/sec/sec (approximately 32.174 ft/sec/sec). From Newton's Second Law, the thrust of a rocket engine equals the mass flow rate times the average exhaust velocity. Hence, average exhaust velocity is a measure of rocket engine performance. Typical average exhaust velocities range from about 800 m/sec for black powder rockets to 4565 m/sec for the highest performing oxygen/hydrogen rocket engines. (Electric thrusters have much higher exhaust velocities.) In English speaking countries it is customary to describe flow rates in pounds/second, but pounds are units of force, not of mass. The unit of mass is the slug, which actually weighs 32.174 pounds. To convert pounds/second to slugs/second, one must divide by the acceleration of gravity, 32.174 ft/sec/sec. That is how the custom arose of describing rocket engine performance in terms of "specific impulse" which is the average exhaust velocity divided by "g" (9.80665 m/s/s or 32.174 ft/s/s). To convert specific impulse back to average exhaust velocity, simply multiply by the acceleration of gravity. Magneticlifeform (talk) 23:09, 11 October 2010 (UTC)

  • It's not even interesting as history (dividing by g to get convert imperial unit to mass). It's worse than wrong. First, I don't see anything "cogent" in introducing arcane stuff like slugs in the lede, when you're right in the middle of explaining something else. Moreover, I think the explanation above is physically wrong, inasmuch as it tries to "explain" the need to divide by g to get units of force (thrust) from "mass flow" * "exhaust velocity". The latter is m/t * v = mv/t, but that does indeed give units of thrust = force. HOWEVER, specific impulse is not thrust and it never has force units. So, all this is more complicated, and bad physics AS WELL.

    Dimensionally, specific impulse (Isp) is presented in two different basic dimensional forms: as momentum/mass = velocity, AND as momentum/weight = mv/mg = v/g = time. This is independent of whether SI or Imperial units are used. The "explanation" of needing to divide by a weight, works to explain the "time unit" specific impulse (Isp in sec), but not for the "velocity unit" specific impulse (Isp in ft/sec or m/sec or whatever velocity units you like). SBHarris 18:31, 25 January 2011 (UTC)[reply]

The Downlink: Issue 2

 
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You have recieved this newsletter because you are currently listed as a member of WikiProject Spaceflight, or because you are not a member but have requested it. If you do not wish to receive future issues, please add your name to the opt-out list.

Delivered by MessageDeliveryBot on behalf of WikiProject Spaceflight at 00:21, 2 February 2011 (UTC).[reply]

Hello, N2e. You have new messages at Gracefool's talk page.
You can remove this notice at any time by removing the {{Talkback}} or {{Tb}} template.

Wikipedia Ambassador Program Newsletter: 13 February 2011





This is the second issue of the Wikipedia Ambassador Program Newsletter, with details about what's going on right now and where help is needed.



  • Userboxes and profiles - Add an ambassador userbox to your page, and make sure you've added your mentor profile!
  • Be a coordinating ambassador - Pick and class and make sure no students fall through the cracks.
  • New screencasts - Short videos on watchlists and a number of other topics may be useful to students.
  • Updates from Campus Ambassadors - Ambassadors are starting to report on classroom experiences, both on-wiki and on the Google Group.
  • Other news - There's a new on-wiki application for being an Online Ambassador, and Editing Friday #2 is today!
  • Things you can do - This is just a sample; if you're eager for something to do, there's plenty more.

Delivered by EdwardsBot (talk) 18:24, 11 February 2011 (UTC) [reply]

Lockheed Martin X-33

Hi N2e; I noticed you recently added a citation needed tag for a statement about the origins of the X-33. This statement was easily found in one of the external links; even easier if you use google. As a regular to spaceflight articles, I assume you know NASA provides pretty much all of its documents online, so my question is, why didn't you simply add the reference yourself? Mlm42 (talk) 18:53, 16 February 2011 (UTC)[reply]

Fairly simple, really: Wikipedia needs articles to be improved with verifiable, reliable source citations in myriad uncountable ways. I add many citations to Wikipedia every day. In other cases, when I have other priorities, I flag the claim and will simply have to leave it to the editors who care most about an article, or have the most facility with the literature on that topic to cite it in the future in the great spontaneous order that is Wikipedia.
There is a much fuller summary of my thoughts on this topic here, in a discussion that you have personally weighed in on. See "the end of the matter" subsection for the summary. Cheers. N2e (talk) 19:27, 16 February 2011 (UTC)[reply]
I think everyone agrees we need more references (see Category:Wikipedia backlog). But ask yourself, are you adding the citation needed tags for the readers or for other editors? When readers see a "citation needed" tag, it makes them think that somebody, somewhere genuinely has a reason to doubt this statement. Indeed, the guideline WP:NOCITE suggests we tag statements which are "doubtful". If there are generally problems regarding lack of inline citations, then just add {{More footnotes}} to the section, or article, and add the citation needed tags to particularly doubtful statements. If I understand your position correctly, your motivation for adding the citation needed tags is to get other editors to act, rather than to bring doubt into the reader's mind. Is that right?
No, that is not my position. Other editors might cite it, or they might not. I'm agnostic on whether that happens or doesn't. And I don't force other editors to work on any particular thing with the time they donate to Wikipedia. See the "end of the matter" I previously referred you to and search for "In my view, Wikipedia is improved in one of two ways" I don't really have any motivation to discuss it much more deeply than that right now. N2e (talk) 20:39, 18 February 2011 (UTC)[reply]
I suppose an editor would be within the policies and guidelines of Wikipedia if they added {{cn}} to every single unsourced sentence, regardless of whether the editor genuinely doubted the sentence.. but this doesn't seem very helpful to readers or other editors. I think it would be better to use {{More footnotes}}, or bring up issues on the talk page. Mlm42 (talk) 21:21, 16 February 2011 (UTC)[reply]
I hear your preference. But it has been my experience that most editors, on most articles in Wikipedia, will not support part two of the "two ways" forward without the more specific {{citation needed}} tags on specific claims. N2e (talk) 20:39, 18 February 2011 (UTC)[reply]
Right, so you're adding the tag for the editors, not for the readers. I'm just saying it's better to add tags like this to article space only if you think the reader should see them. One of the reasons editors react, is because they don't want the reader to be faced with a citation needed tag unnecessarily; in other words, you're kicking (knowingly or not) other editors into action. Which is fine, you're within your rights to do it if you want, I'm just saying that one reason people are objecting to these actions sometimes, is because they seem unfriendly. Mlm42 (talk) 20:59, 18 February 2011 (UTC)[reply]
Well, it would be best if folks assumed good faith, but humans are humans and will take things that are article-improvement related as "unfriendly" to some or the other particular editor. I guess if the authors who first added the claims just ensured they were sourced, there would be a lot less need for identifying the unsourced assertions and then patiently allowing a lot of time to pass to see if anyone wants to source the claims. But do note however, if there is some article you are working on, and you would prefer that I remove some of the individual requested cite tags that I added and replace them with a more general section-level or article-level tag, and then you would go forward citing the most important claims that in your view, as one of the authors, would most make the article better, just ask on my Talk page. Cheers. N2e (talk) 06:46, 19 February 2011 (UTC)[reply]

Talkback

Hello, N2e. You have new messages at GW Simulations's talk page.
Message added 16:34, 17 February 2011 (UTC). You can remove this notice at any time by removing the {{Talkback}} or {{Tb}} template.[reply]

Mentoring students: be sure to check in on them

This message is going out to all of the Online Ambassadors who are, or will be, serving as mentors this term.

Hi there! This is just a friendly reminder to check in on what your mentees are doing. If they've started making edits, take a look and help them out or do some example fixes for them, if they need it. And if they are doing good, let them know it!

If you aren't mentoring anyone yet, it looks like you will be soon; at least one large class is asking us to assign mentors for them, and students in a number of others haven't yet gotten to asking ambassadors to be their mentors, but may soon. --Sage Ross - Online Facilitator, Wikimedia Foundation (talk) 20:07, 21 February 2011 (UTC)[reply]

groups of students in need of mentors

Hey there. One of the classes working with the Wikipedia Ambassador Program, Jonathan Obar's Media and Telecommunication Policy, is working in small groups and would like us to assign a mentor to each group (rather than having students request the mentors they'd like, as other classes are doing).

I invite you to sign on as the mentor for one or more groups, especially if any of the topics catch your interest. To sign up, go to the course page and add yourself as "Mentor: you" in the section for that group. They students and/or professor or campus ambassadors should be cleaning things up soon to list all the usernames for each group and add a few more groups. Once you know who the students are in the group, you can leave them each a quick introduction to let them know you'll be mentoring their group.

Thanks!--Sage Ross - Online Facilitator, Wikimedia Foundation (talk) 19:11, 22 February 2011 (UTC)[reply]

Good idea. I looked over the list and have signed on to mentor three students, on the topic of Spectrum auction. Cheers. N2e (talk) 06:16, 23 February 2011 (UTC)[reply]

Poor Man's Talkback

See here]. NeutralhomerTalk03:45, 28 February 2011 (UTC)[reply]

The Downlink: Issue 3

 
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    Your source for news on WikiProject Spaceflight Issue 3, March 2011  
 
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Delivered by MessageDeliveryBot on behalf of Spaceflight at 09:09, 3 March 2011 (UTC).[reply]

Check Your Area of Study

Hello, I have updated the Project Page you are mentoring on with usernames for all the students in your Area of Study. Please send them a message introducing yourself and let them know you are there to help.

As always, please let me know if I can be of assistance. Take Care...NeutralhomerTalk10:14, 3 March 2011 (UTC)[reply]

Thanks

Just saw your pat-on-the-back about the [Allen radiation belt] problem, which I somehow missed until just now. Much appreciated! Wwheaton (talk) 18:54, 3 March 2011 (UTC)[reply]

You are quite welcome. That was a great piece of work to help out Wikipedia! Any kudos you receive are well deserved. N2e (talk) 20:08, 3 March 2011 (UTC)[reply]

Mentor Request

N2e, I am looking for a mentor. I am a student in Approaches to Development and a member of the WikiProjects U.S. Public Policy Initiative.

As part of this course, I had hoped to work on an article related to technology and development. Specifically, I hoped to include information related to the concepts behind the Design for the Other 90% exhibit at the Cooper-Hewitt Museum. I was thinking of either editing the Appropriate Technology article (specifically the [technology in developing areas] section) to include more information on design, appropriate technology, and development or creating a new article for this information.

I would appreciate any advice related to this plan, in particular your thoughts on editing the existing article to expand the section on appropriate technology in developing areas or beginning a new article. I find the appropriate technology article to be a little overwhelming, probably due to the poor organization and the almost "dump" of information.

Thank you for your time. EstellaGr8 (talk) 03:00, 11 March 2011 (UTC)[reply]

Sure, I would be glad to be your mentor on your project. I am uncertain how much help I will be with the content of your work, but will definitely agree to assist you in your project if you want me to be your mentor, majoring on the Wikipedia side of things, and perhaps offering you a useful "big picture" perspective on how any good Wikipedia article emerges. Having said that, I do have some personal background with understanding, and implementing, appropriate technology (for a U.S. "developed nation" situation -- more about that later if you are interested) and have read a bit on AT more broadly (although that was quite some time ago), so I would imagine I might provide some assistance on the content as well. I will look more carefully at your specific early requests, and read the pages about your WikiProject, course, and the existing Appropriate Technology article tomorrow morning. Take a look at my User page to learn a bit more about me, and let me know explicitly if you want to go ahead with me as your mentor. Cheers. N2e (talk) 07:07, 11 March 2011 (UTC)[reply]
Thank you for agreeing to act as my mentor I appreciate your assistance. --EstellaGr8 (talk) 12:20, 11 March 2011 (UTC)[reply]
Okay then, we are good to go. I've added you to my [list] and am now full. I will comment on your specific early questions later this morning. N2e (talk) 15:37, 11 March 2011 (UTC)[reply]

Marking articles students are working on

Howdy, Online Ambassador!

This is a quick message to all the ambassadors about marking and tracking which articles students are working on. For the classes working with the ambassador program, please look over any articles being worked on by students (in particular, any ones you are mentoring, but others who don't have mentors as well) and do these things:

  1. Add {{WAP assignment | term = Spring 2011 }} to the articles' talk pages. (The other parameters of the {{WAP assignment}} template are helpful, so please add them as well, but the term = Spring 2011 one is most important.)
  2. If the article is related to United States public policy, make sure the article the WikiProject banner is on the talk page: {{WikiProject United States Public Policy}}
  3. Add Category:Article Feedback Pilot (a hidden category) to the article itself. The second phase of the Article Feedback Tool project has started, and this time we're trying to include all of the articles students are working on. Please test out the Article Feedback Tool, as well. The new version just deployed, so any bug reports or feedback will be appreciated by the tech team working on it.

And of course, don't forget to check in on the students, give them constructive feedback, praise them for positive contributions, award them {{The WikiPen}} if they are doing excellent work, and so on. And if you haven't done so, make sure any students you are mentoring are listed on your mentor profile.

Thanks! --Sage Ross - Online Facilitator, Wikimedia Foundation (talk) 18:13, 15 March 2011 (UTC)[reply]

Okay, I have done no. 1 and no. 3 for one of the two projects (one of the four editors I am currently mentoring). Will wait for the other students to get active on their article before doing nos. 1-3 for that article. Cheers. N2e (talk) 18:37, 16 March 2011 (UTC)[reply]

Notice of edit of page that is of interest to you

I've edited the Great Pacific Garbage Patch to include a mass media reference, as well as to remove gross misrepresentation of a certain academic paper, which, ironically enough, is publicly available. The mass media reference, incidentally, quotes the primary author of the paper in question, seven years after the publication of the paper in question, to the effect that the plastic density is one thousand times greater than that extrapolated from his paper by a dishonest wikipedia author, who shall probably remain anonymous, or at least not be exposed due to my efforts. The paper considers plastic particulates in the neuston, and the wikipedia article in the original form falsely implied that the paper was calculating the total platic mass in the Great Pacific Garbage Patch. I deliver this notice so as to avoid editing wars, as I'd like either an accurately cited paper to the effect of the original claim (I'll notice in passing that the claim made also constituted original research), or that the undocumented claim not be returned. I realise that you might not be the author of that claim. Boeremoer (talk) 03:43, 16 March 2011 (UTC)[reply]

I have added a comment to the Talk page. Cheers. N2e (talk) 14:08, 20 March 2011 (UTC)[reply]

Got a message about an hour ago from Professor Obar of the Media and Telecommunication Policy project and I think it is viewed best in full:

Can you please communicate to the online mentors that I DO NOT want them moving student material into the main space for them. This is a big problem. I have noticed that this has happened with a number of the projects already, for example, in the broadband.gov article and the media cross-ownership article. We need the students to be doing this on their own, of course so they can learn how to do it, and also so that I can grade what they've done. How am I supposed to follow student submissions if the data is associated with online mentors? A BIG PROBLEM ALREADY... please help me with this. None of you responded to my post about this on the discussion page. This is about to get out of hand. Jaobar (talk) 05:27, 20 March 2011 (UTC)

With that, of course, please only give instructions on how to move, don't do it for them. Please only let them know what to do and let them do it themselves. If they run into problems, provide further instructions. Do not it for them. This seems to be making a mess of Prof. Obar's grading system and I would like to avoid that. Thanks. - NeutralhomerTalkCoor. Online Amb'dor06:11, 20 March 2011 (UTC)[reply]

No problem here. I am "coaching" only, and not "doing". Seems like that is what mentoring ought to be: you know, teaching them to fish not handing them a fish. N2e (talk) 13:36, 20 March 2011 (UTC)[reply]

EstellaGr8 Talkback

Hello, N2e. You have new messages at EstellaGr8's talk page.
Message added 12:03, 21 March 2011 (UTC). You can remove this notice at any time by removing the {{Talkback}} or {{Tb}} template.[reply]


Hello, N2e. You have new messages at Anna Frodesiak's talk page.
You can remove this notice at any time by removing the {{Talkback}} or {{Tb}} template.

Wikipedia Ambassador Program Newsletter: 21 March 2011





This is the third issue of the Wikipedia Ambassador Program Newsletter, with details about what's going on right now and where help is needed.



Delivered by EdwardsBot (talk) 22:25, 21 March 2011 (UTC) [reply]

Talkback

Hello, N2e. You have new messages at User talk:Colds7ream/List of space stations.
Message added 17:29, 22 March 2011 (UTC). You can remove this notice at any time by removing the {{Talkback}} or {{Tb}} template.

Posting Photos

Hey, sorry I havent communicated with you about the Spectrum Auction project. Currently, we have an assignment where we have to do random edits on other wiki pages. I chose to update some things about the cast of The Cosby Show but I cant figure out how to add a picture to the biography section (the long box on the right hand side of the pages). I saw the code from the page on the actual show but I dont know how to get the photos to show up on the page Im doing. I would appreciate any help, thanks.

Letia Armstead



Advice On Undoing an Edit

N2e, I was hoping you could advise me on undoing an edit someone recently made to the Appropriate technology page. They changed the spelling of industrialized to British version: industrialised. As this is the only British-English spelling I can find on the page (utilizing is used in the same paragraph and not utilising, practice is also used throughout the article and not pratise), I was going to change it back to the American-English version. Is that an acceptable thing to do? Thanks for the help. EstellaGr8 (talk) 20:51, 24 March 2011 (UTC)[reply]

First off, I think your intuitive sense of things is about right. I have not looked at the page to consider which type of English spelling, but your intuition is what I usually see: if one type of English spelling is used on a page, it probably should not be changed. However, I do think you should familiarize yourself with the WP manual of style on the topic, it is here.
If the change back is liable to be contentious (and I have no idea at all if it is), then it can be good practice to mention your logic for it, proposal, etc. on the Talk page first. That gives you a chance to build a consensus with other editors.
Having said that, Wikipedia encourages editors to be WP:BOLD, but then offers WP:BRD as a useful process for making it all work out if there is contention on an issue. Some editor is Bold and makes a change to an article (say, use of British English in a word); then some other editor, if they don't think that is quite right, can Revert; then there can/should be a Discussion on the Talk page. Using this logic, it is quite acceptable to just revert it, and invite discussion on the talk page.
At the end of the day, use either approach you think feels right for this circumstance. I will join in on the Talk page (and read the relevant background) at such time as the discussion makes it to that point. Cheers. N2e (talk) 05:06, 25 March 2011 (UTC)[reply]