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Weak interaction - Wikipedia, the free encyclopedia The weak interaction (often called the weak force or sometimes the weak nuclear force) is one of the four fundamental interactions of nature. Although the weak interaction used to be described by Fermi's theory of a contact four-fermion interaction, the discovery of parity violation and renormalization theory suggested a new approach was needed. These three fields become the W and Z bosons of the weak interaction, while the fourth field remains massless and is the photon of electromagnetism. en.wikipedia.org /wiki/Weak_interaction   (910 words)

Weak - Wikipedia, the free encyclopedia A person may be said to be weak, or the signs of life of a dying person may be said to be weak. A weak symbol is a symbol definition in an object file or dynamic library that may be overridden by other symbol definitions. The weak topology, the weak polar topology, the weak operator topology and weak-star topology of functional analysis. en.wikipedia.org /wiki/Weak   (287 words)

Fundamental Forces The discovery of the W and Z particles in 1983 was hailed as a confirmation of the theories which connect the weak force to the electromagnetic force in electroweak unification. This suggests the weak interaction mechanism for the decay of the pion, which is observed to happen by the muon pathway. The weak interaction in the electron form at left above is responsible for the decay of the neutron and for beta decay in general. hyperphysics.phy-astr.gsu.edu /hbase/forces/funfor.html   (1168 words)

Weak Force In contrast to electromagnetic and strong forces, the strength of the weak force is different for particles and anti-particles (Charge Violation), for a scattering process and its mirror image (Parity Violation), and for a scattering process and the time reversal of that scattering process (Time Violation). The weak interaction finds practical application in the radioactive elements used in medicine and technology, which are in general beta-radioactive, and in the beta-decay of a carbon isotope into nitrogen, which is the basis for the carbon-14 method for dating of organic archaeological remains. The weak charges of quarks and leptons are comparable to their electromagnetic charges, a manifestation of how electromagnetism and the weak force are components of a unified electroweak force. www-project.slac.stanford.edu /e158/weakforce.html   (572 words)

Theory: Weak Interactions Weak interactions involve the exchange or production of W or Z bosons. Carlo Rubbia and Simon van der Meer were awarded the 1984 Nobel Prize for their development of the facility at CERN which first produced and detected W and Z bosons, and for their leadership of the discovery experiment. The weak interaction was first recognized in cataloging the types of nuclear radioactive decay chains, as alpha, beta, and gamma. www2.slac.stanford.edu /vvc/theory/weakinteract.html   (481 words)

Weak Christians | Saint Augustine of Hippo -Welcome to The Crossroads Initiative The weak are those who want to live a good life but are unwilling or unable to endure the sufferings that inevitably threaten. In the case of the weak sheep, it is to be feared that the temptation, when it comes, may break him. Weak men are those who appear to be zealous in doing good works but are unwilling or unable to endure the sufferings that threaten. www.crossroadsinitiative.com /library_article/250/Weak_Christians__St._Augustine.html   (649 words)

3.3 weakref -- Weak references A weak reference to an object is not enough to keep the object alive: when the only remaining references to a referent are weak references, garbage collection is free to destroy the referent and reuse its memory for something else. A primary use for weak references is to implement caches or mappings holding large objects, where it's desired that a large object not be kept alive solely because it appears in a cache or mapping. use weak references in their implementation, setting up callback functions on the weak references that notify the weak dictionaries when a key or value has been reclaimed by garbage collection. docs.python.org /lib/module-weakref.html   (951 words)

WeakReference (Java 2 Platform SE v1.4.2) Weak reference objects, which do not prevent their referents from being made finalizable, finalized, and then reclaimed. At that time it will atomically clear all weak references to that object and all weak references to any other weakly-reachable objects from which that object is reachable through a chain of strong and soft references. Creates a new weak reference that refers to the given object and is registered with the given queue. java.sun.com /j2se/1.4.2/docs/api/java/lang/ref/WeakReference.html   (263 words)

weak agnosticism Weak agnosticism is, I think, best defended via an appeal to a principle of epistemic conservatism, along the following lines: one is rationally justified in continuing to believe that p unless one comes to possess positive reason to cease to do so. If the weak agnostic is not prepared to accept or reject the many conflicting hypotheses about the cosmological origins of the universe, why isn't she similarly prepared neither to accept nor reject conflicting hypotheses about the age of the universe, or the nature of the external world? Since the agnostic sees no reason to think that it is no more likely that the world is uncreated than it is that the world was created according to one particular hypothesis about that act of creation, she has no reason to accept the modified version of Forrest's argument.[21] Agnostics can reasonably resist deism. www.infidels.org /library/modern/graham_oppy/agnostic.html   (8718 words)

Technical Note TN2064: Ensuring Backwards Binary Compatibility - Weak Linking and Availability Macros on Mac OS X Weak linking was introduced as a supported OS feature in Mac OS X version 10.2, and the first developer toolset to support weak linking is the July 2002 Developer Tools that shipped as a part of Mac OS X version 10.2. Weak linking allows you to link a symbol such that the symbol does not have to be present at runtime for the binary to continue running. However, weak linking as a feature did not exist in ld or dyld in Mac OS X versions prior to 10.2, so you have to explicitly enable it by setting an environment variable before compilation to tell linker that features can be used that were introduced starting in version 10.2. developer.apple.com /technotes/tn2002/tn2064.html   (3525 words)

strong vs. weak - BioWare's Official Jade Empire Site Strong attacks and weak attacks both halve their health bar so I don't think it could be that. Weak attacks do less damage and don't break blocks, but are much faster, so yuou can usually hit more often. Weak attacks would be too powerful if they did the same amount of damage as the strong attack. jade.bioware.com /forums/viewtopic.html?forum=103&topic=418556   (805 words)

weak. The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. Designating a verse ending in which the metrical stress falls on a word or syllable that is unstressed in normal speech, such as a preposition. Weak is the most widely applicable: “These poor wretches … were so weak they could hardly sit to their oars” (Daniel Defoe). Feeble suggests pathetic or grievous physical or mental weakness or hopeless inadequacy: a feeble intellect; a feeble effort. www.bartleby.com /61/76/W0067600.html   (378 words)

Weak Arrays of weak pointers and hash tables of weak pointers. A weak pointer is a value that the garbage collector may erase at any time. A weak pointer is said to be full if it points to a value, empty if the value was erased by the GC. caml.inria.fr /pub/docs/manual-ocaml/libref/Weak.html   (229 words)

Weak Lensing Page This very weak distortion has been extracted to give two-dimensional mass-maps of the clusters and allow determination of their total masses. To detect this very weak tidal shearing of the light from background galaxies requires averaging over many such galaxies to reduce the noise introduced by the intrinsic ellipticity of these background galaxies. We are part of a project to find the weak lensing maps and masses for a complete, X-ray luminosity-limited sample of 25 nearby southern clusters scheduled for Sunyaev-Zel'dovich (SZ) observations by the Viper telescope at the South Pole. astro.uchicago.edu /home/web/joffre/weaklensing.html   (741 words)

Scientists make landmark observations about weak force The collaboration's challenge was to find the rate of rare events: the electron-electron scatters that took place by exchanging a Z particle, which mediates the weak force (see illustration at http://www-group.slac.stanford.edu/com/e158/feynman.htm). Because there is an asymmetry in how the weak force acts, there is a slight difference in how often left-handed electrons scatter using a Z particle compared to the rate for right-handed electrons. The measured asymmetry for E158 is proportional to the electron's weak charge, which determines the strength of the weak force between two electrons. news-service.stanford.edu /news/2005/july13/weak-071305.html   (839 words)

Weak Hadith Summary: Sometimes a weak hadith defense is used to divert the criticism of Muhammad's behavior that is recorded in ancient traditional Muslim sources. A weak hadith technically refers to the chain of narrators (isnad), reputation of the narrators, and the text of narration (matn). Therefore, it is unjustified to use a weak hadith defense when a sahih hadith is used to present the actions and teachings of Muhammad. www.muhammadanism.org /Hadith/Weak.htm   (1560 words)

weak definition - Dictionary - MSN Encarta Do not confuse the spelling of weak and week, which sound similar. Weak is an adjective meaning "not strong," as in weak legs, weak tea, a weak argument. He's a weak man who can't resist the chance of what seems like easy money. encarta.msn.com /encnet/features/dictionary/DictionaryResults.aspx?refid=1861711718   (382 words)

Definition of weak - Merriam-Webster Online Dictionary 4 a : not able to function properly eyes> b (1) : lacking skill or proficiency (2) : indicative of a lack of skill or aptitude subject> c : wanting in vigor of expression or effect weak translation of the poem> coffee> b : lacking normal intensity or potency weak radio signal> weak strain of virus> suggests extreme weakness inviting pity or contempt . www.m-w.com /cgi-bin/dictionary?book=Dictionary&va=weak   (460 words)

The WEAK signature   (Site not responding. Last check: 2007-10-23) A weak pointer is one that is not sufficient to keep an object live. is pointed to by ordinary pointers and by weak pointers, it will stay live (not be garbage collected); but if it is pointed to only by weak pointers, then it may be garbage collected. The semantics of weak pointers to immutable data structures in ML is ambiguous. www.smlnj.org /doc/SMLofNJ/pages/weak.html   (368 words)

CD Baby: WEAK: weak - from blackdog Weaks music is like erie pulsing vines entering your emotional soul, wrapped in a haunting embrace. Weak is Antony Widoff, a self-styled hermit who makes a variety of delightfully odd, demented and outrageously beautiful music in a room somewhere in upstate New York. Regardless of my inability to capture the genius of Weak, the sound of Weak can easily be drawn from that mighty behemoth of a paragraph. www.cdbaby.com /cd/weak/from/blackdog   (778 words)

Center for Global Development : Initiatives: Archived Initiatives: Commission on Weak States and US National Security On the Brink recognizes that weak and failed states matter to US national security, American values and the prospects for global economic growth; and that a successful response to addressing the challenges of weak states combines security and development policies. Weak states are the "sleeping giant" threat to national security, receiving extremely limited attention within the highest levels of government. "Weak and failing states are as much a strategic problem as they are a moral and humanitarian concern. www.cgdev.org /section/initiatives/_archive/weakstates   (457 words)

Bridge:Weak Two Archive   (Site not responding. Last check: 2007-10-23) While not stricly "weak two", Tom's use of a multi 2 diamond opposite partner's 1 club is quite clever (click the link). So long as you do not mix weak and strong hands and hold at least 4 cards in the suit bid, you can do this right down to level 2 (God help them!) Rule of 22 still applies and your partner must explore game if his hand justifies it opposite a decent pre-empt. In particular where an opening may be weak or strong those who fail to explore game opposite a possible strong type may be penalised. www.cavendish.demon.co.uk /bridge/weak.two/index.htm   (3128 words)

MedlinePlus Medical Encyclopedia: Pulse - weak or absent Weak or absent pulse is any difficulty in feeling a pulse, or an inability to detect a pulse at all. An absent or weak pulse may affect one limb or affect the whole body. The absence of a pulse as determined by a lay person (someone who is not a medical professional) may not indicate a problem. www.nlm.nih.gov /medlineplus/ency/article/003078.htm   (397 words)

Weak bones - WrongDiagnosis.com The cause of Weak bones may be more easily identified if other symptoms exist. When you follow a link to our interactive multiple symptoms page, you will be able to modify your list by adding and removing symptoms thus helping to better research your condition. The distinction between a symptom and complication is not always clear, and conditions mentioning this symptom as a complication may also be relevant. www.wrongdiagnosis.com /sym/weak_bones.htm   (482 words)

weak (definition) [a] having little physical or spiritual strength; "a weak radio signal"; "a weak link". [a] overly diluted; thin and insipid; "washy coffee"; "watery milk"; "weak tea". [a] used of vowels or syllables; pronounced with little or no stress; "a syllable that ends in a short vowel is a light syllable"; "a weak stress on the second syllable". lookwayup.com /lwu.exe/lwu/d?s=f&w=weak   (87 words)

Weak Lensing and GOODS Weak gravitational lensing allows us to directly measure, for example, the power spectrum of mass density perturbation on the scale of eight megaparsecs. A weak lensing signal manifests as about a two to ten percent shear and convergence in an image. Identification and deconvolution of systematic error from PSF and pixelization effects are essential for measuring the weak lensing shear. www-astro.lbl.gov /~fwh   (850 words)

Waldo Jaquith » Blog » Kilgore and “weak.” I’ve been pushing the “weak Kilgore” meme for months now, because I think it will be effective. [C]onsider a Kaine campaign piece describing Kilgore as “weak and ineffective on parole abolition.” This is a truly astonishing claim since Kilgore was secretary of public safety in the administration that rewrote parole laws, changing them from a revolving door to a barely cracked one. True, as the release states, thousands of prisoners sentenced before the new parole laws took effect still are eligible for parole based on the old laws. waldo.jaquith.org /blog/2005/03/kilgore-weak-2   (1472 words)

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