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=== A wiki encyclopedia project&mdash;and more! ===
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[[Image:Water drop crop.jpg|center|thumb|300px|{{#ifexist:Template:Water drop crop.jpg/credit|{{Water drop crop.jpg/credit}}<br/>|}}Each sentence you add is another drop in an expanding sea of words.]]


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|<div style="background-color:lightyellow; color:darkblue; font-size:90%">'''Share your knowledge. It's a way to achieve immortality.'''<br>&nbsp;&nbsp;&nbsp;&mdash;'''Often attributed to the Dalai Lama'''</div>
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=== Draft of the Week <font size=1>[ [[CZ:Article of the Week|about]] ]</font> ===
[[Image:Tapping_coherer.jpg|thumb|left|200px|Classic "tapping" form of a glass tube "filings coherer".]]A '''[[coherer]]''' is a type of [[radio]] detector, popular in the earliest days of radio development, beginning around 1890. Coherer receivers, used in conjunction with [[spark-gap]] transmitters, were the first devices to make radio communication practical. However, although hailed at the time as a "marvelous electric eye", their relative insensitivity and unreliability led to their replacement by more sophisticated detectors, so the device that helped create a communications revolution disappeared from commercial use by around 1905.


The defining characteristic of a coherer detector is a "light-contact" segment that is normally a poor electrical conductor, but which undergoes a sudden change in conductivity &mdash; usually a marked increase &mdash; in response to increased voltage, including that induced by a received radio signal. A limitation of coherers is that they cannot be used for full audio reception of radio signals, and are limited to receiving simple on-off transmissions, such as the telegraphic dots-and-dashes of Morse code produced by the intermittent keying of a transmitter.
<font size=1>[[Coherer|['''more...''']]]</font>


=== New Draft of the Week <font size=1>[ [[CZ:New Draft of the Week|about]] ]</font> ===
|rowspan=2 style="width:50%; border:1px solid #e9e9e9; border-color:rgba(0,0,0,0.05); margin:0; padding:0; background:#fafafa; background:rgba(255,255,255,0.6); vertical-align:top; -moz-border-radius:0 10px 10px;  -webkit-border-radius:10px;  -webkit-border-top-left-radius:0; -moz-background-clip:padding; -webkit-background-clip:padding;"|
[[Image:Whale-meat-dish.jpg|right|thumb|200px|{{#ifexist:Template:Whale-meat-dish.jpg/credit|{{Whale-meat-dish.jpg/credit}}<br/>|}}Whale meat is considered a delicacy in [[Japan]]. Here, the meat has been sliced into a strip of 'whale bacon'.]]
{|cellspacing=0 style="width:100%; padding:0; margin:0; background:transparent;"
'''[[Whale meat]]''' refers to the edible flesh of various [[species]] of [[whale]]. It can be prepared and eaten in various ways, and for example forms one part of traditional [[Japan]]ese cuisine (鯨肉 ''gei niku'' 'whale meat'). Servings also appear on menus in [[Norway]] and [[Iceland]], where whales are also [[whaling|hunted]], and also some [[Aboriginal]] communities take whales for their [[meat]].
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<h4 style="margin:0 0 0.75em; padding:0;"> '''Article counts''' </h4>
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[[:Category:Citable versions of articles|Citable Articles]] <font size=1>('''{{PAGESINCAT:Citable versions of articles}}''')</font><br />
[[:Category:Developed Articles|Developed Articles]] <font size=1>('''{{PAGESINCAT:Developed Articles}}''')</font><br />
[[:Category:Developing Articles|Developing Articles]] <font size=1>('''{{PAGESINCAT:Developing Articles}}''')</font><br />
[[:Category:Stub Articles|Stubs]] <font size=1>('''{{PAGESINCAT:Stub Articles}}''')</font><br />
<small>([[:Category:CZ Live|{{PAGESINCAT:CZ Live}} total articles]])</small>
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In recent years, however, concerns have been raised about the levels of [[pollution|pollutants]] in samples of whale meat,<ref>''[[New Scientist]]'': '[http://www.newscientist.com/article/dn2362-extreme-mercury-levels-revealed-in-whalemeat-.html Extreme mercury levels revealed in whalemeat]'. 6th June 2002.</ref> and many people around the world object to the hunting and eating of whales and [[dolphin]]s. In turn, pro-whaling representatives have argued that eating whale meat is more [[global warming|environmentally friendly]] than consuming meat raised from [[cattle]].
{{-}}
<font size=1>[[Whale meat|['''more...''']]]</font>
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<big>[[CZ:Featured article|Featured Article]]: ''[[{{FeaturedArticleTitle}}]]''</big>  
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<div style='text-align: right;'><small>''[[{{FeaturedArticleTitle}}|Continued]]...''</small></div>

Revision as of 19:28, 18 February 2024

Help Write Articles about our World

Welcome to Citizendium, a wiki for providing free knowledge where authors use their real names. We regard information as a public good and welcome anyone who wants to share their knowledge on virtually any subject. Our online community prides itself on being congenial and supportive. Read more about who we are.

See Recent Changes—an overview of articles being worked on now.

Become a member--it's free!

Agriculture Earth Sciences Journalism Physics
Anthropology Economics Law Politics
Archaeology Education Library & Info. Sci. Psychology
Architecture Engineering Linguistics Religion
Astronomy Food Science Literature Robotics
Biology Games Mathematics Sociology
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Classics History Music Topic Informant
Computers Hobbies Philosophy Visual Arts


Please help today!
Please make your donations here.
Donations go to keep our servers running. See our financial report.


New Blog Post
Why save Citizendium? My reason number 1.

Article counts

Citable Articles (146)
Developed Articles (1,129)
Developing Articles (7,403)
Stubs (7,676)
(16,484 total articles)

Nam et ipsa scientia potestas est (And thus knowledge itself is power). — Sir Francis Bacon (1561 - 1626), Religious Meditations, Of Heresies
       —add a quotation about knowledge or writing

Featured Article: Nuclear power reconsidered

After decades of failure to slow the rising global consumption of coal, oil and gas,[1] many countries have proceeded as of 2024 to reconsider nuclear power in order to lower the demand for fossil fuels.[2] Wind and solar power alone, without large-scale storage for these intermittent sources, are unlikely to meet the world's needs for reliable energy.[3][4][5] See Figures 1 and 2 on the magnitude of the world energy challenge.

Nuclear power plants that use nuclear reactors to create electricity could provide the abundant, zero-carbon, dispatchable[6] energy needed for a low-carbon future, but not by simply building more of what we already have. New innovative designs for nuclear reactors are needed to avoid the problems of the past.

(CC) Image: Geoff Russell
Fig.1 Electricity consumption may soon double, mostly from coal-fired power plants in the developing world.[7]

Issues Confronting the Nuclear Industry

New reactor designers have sought to address issues that have prevented the acceptance of nuclear power, including safety, waste management, weapons proliferation, and cost. This article will summarize the questions that have been raised and the criteria that have been established for evaluating these designs. Answers to these questions will be provided by the designers of these reactors in the articles on their designs. Further debate will be provided in the Discussion and the Debate Guide pages of those articles.

Footnotes

  1. ↑ Global Energy Growth by Our World In Data
  2. ↑ Countries, organizations, and public figures that have reconsidered their stance on nuclear power are listed on the External Links tab of this article.
  3. ↑ Pumped storage is currently the most economical way to store electricity, but it requires a large reservoir on a nearby hill or in an abandoned mine. Li-ion battery systems at $500 per KWh are not practical for utility-scale storage. See Energy Storage for a summary of other alternatives.
  4. ↑ Utilities that include wind and solar power in their grid must have non-intermittent generating capacity (typically fossil fuels) to handle maximum demand for several days. They can save on fuel, but the cost of the plant is the same with or without intermittent sources.
  5. ↑ Mark Jacobson believes that long-distance transmission lines can provide an alternative to costly storage. See the bibliography for more on this proposal and the critique by Christopher Clack.
  6. ↑ "Load following" is the term used by utilities, and is important when there is a lot of wind and solar on the grid. Some reactors are not able to do this.
  7. ↑ Fig.1.3 in Devanney "Why Nuclear Power has been a Flop"

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