የቆሻሻ እቃዎችን ቆሻሻ እንደገና ጥቅም ላይ ማዋል እና እንደገና መጠቀምየተበላሸ ዩራኒየም እና ጤና (ሲቪል ፣ ወታደራዊ) እናቅርብ

የህይወት ማምረት ውጤቶችን በአካባቢያዊ ተጽእኖዎች: ፕላስቲኮች, ኬሚካሎች, ተሽከርካሪዎች, የግብርና-ግብይት ግብይት. በቀጥታ (recycle or recycling) እና በድጋሚ ጥቅም ላይ ማዋልን እንደገና ጥቅም ላይ ማዋል እና ቆሻሻን እንደገና ጥቅም ላይ ማዋል.
ማክሲመስስ ሊዮ
ባለሙያ ኢኮሎጂስት
ባለሙያ ኢኮሎጂስት
መልእክቶች 2065
ምዝገባ: 07/11/06, 13:18
x 81

ያልተነበበ መልዕክትአን ማክሲመስስ ሊዮ » 21/05/11, 17:26

ፊክስክስ እንዲህ ጽፏል
ማክስማይነስ ሊዮ እንዲህ ሲል ጽፈዋልIl y a le lien Wikipedia : http://fr.wikipedia.org/wiki/Uranium_appauvri

Un document AREVA où on affirme que l'uranium appauvri n'est pas utilisé par l'armée française :"The French Defense Ministry has repeated on several occasions that these materials had never been used by the French armed forces." :

http://www.areva.com/EN/news-5402/a-rev ... anium.html

Or il y a (eu ?) un site d'essai dans les Landes ለእኔ ይመስለኛል ፡፡


Gluuurps ... c'est chez moi ça ! Tu te souviens pas oû ils ont fait le coup ?????

Je n'ai pas (encore) retrouvé le reportage télé (de Envoyé Spécial ?), un officier nous faisait visiter un site de stockage en France. Ça doit dater d'une douzaine d'années.

Mais, il y (eu) des essais du côté de Bourges et dans le Lot :

http://www.rfi.fr/actufr/articles/013/article_7595.asp
http://french.peopledaily.com.cn/french ... 44949.html

"En France par exemple, révèle le quotidien régional la «Nouvelle République», 1 400 obus à l'uranium appauvri ont été testés par le centre d'essai de l'armement de Bourges depuis dix ans."

http://bienprofond.free.fr/hiroshi/2009 ... UAHuma.htm

: አስደንጋጭ: : ክፉ:
0 x

የተጠቃሚው አምሳያ
ክሪስቶፍ
አወያይ
አወያይ
መልእክቶች 51820
ምዝገባ: 10/02/03, 14:06
አካባቢ ፕላኔት ግሪን ሃውስ
x 1081

ያልተነበበ መልዕክትአን ክሪስቶፍ » 21/05/11, 21:02



L'info qui me bleufe le plus sur cette page c'est :

Lors du tir, le recul est équivalent à celui de la poussée d'un des réacteurs de l'A-10


Force du recul : selon cadence. Valeur-type : 45 kN


4.5 Tonnes de recul !

On comprends bien pourquoi l'A10 a 2 moteurs :D
Ca doit bien se sentir dans le cockpit !

J'en ai vu un voler en Belgique qui tournait au dessus de la maison : ca fait un bruit d'airbus très aigu ! Rien à voir avec un Mirage ou F16 !
0 x
Ce forum ነግሮሻል? እሱን እርዱት። እርሱ ሌሎችን መርዳት ለመቀጠል - በኢኮሎጂ እና በ Google ዜና ላይ ጽሑፍ ያትሙ
dedeleco
ባለሙያ ኢኮሎጂስት
ባለሙያ ኢኮሎጂስት
መልእክቶች 9211
ምዝገባ: 16/01/10, 01:19
x 6

ያልተነበበ መልዕክትአን dedeleco » 21/05/11, 23:42

Force du recul : selon cadence. Valeur-type : 45 kN

une impulsion de recul m.v n'est pas une force, et la force subit est déterminée par la résistance du ressort qui absorbe l'impulsion en arrêtant le recul sur une distance.
donc cette phrase n'a pas de sens!!

Avec un simple marteau tapant sur un clou costaud sur du bois extra dur on fait aussi bien et même plus fort, car il s'arrête sur quelques microns !!
0 x
የተጠቃሚው አምሳያ
ክሪስቶፍ
አወያይ
አወያይ
መልእክቶች 51820
ምዝገባ: 10/02/03, 14:06
አካባቢ ፕላኔት ግሪን ሃውስ
x 1081

ያልተነበበ መልዕክትአን ክሪስቶፍ » 22/05/11, 00:18

Il y a bien marqué "selon cadence" et je pense que c'est la résultante "lissée" sur une période de tir (qui ne dépasse pas quelques secondes tout au plus de toute façon).

Si tu veux la calculer, tu peux peux le faire toi même avec le calcul de la réaction ! (masse obus, vitesse d'éjection, cadence...)

Avec la formule très simple:
F = m * V

m = débit massique éjecté en kg/s
V = vitesse initiale (on assimile à la sortie bouche)

መተግበሪያ:

masse obus = 0.35 kg environ

Les bandes de munitions l'alimentant dans l'A-10 comptent souvent quatre PGU-13/B HEI (munition HEI, pour High Explosive Incendiary) explosives-incendiaires de 29 cm de long pour 267 ou 319 g (version amélioré) suivie d'une PGU-14/B API (API, pour Armor Piercing Incendiary) antiblindage de 426 g.


cadence = 2100 tr/min

débit massique = 0.35 * 2100 / 60 =12.25 kg/s

V = 1 000 m/s

Force = 12.25 * 1000 = 12.25 kN

Les 45 kN sont surement atteint dans des conditions d'essais plus difficiles (cadence plus élevée et munition plus lourde).

ps: tu retrouvera le même résultat en partant directement de la 2ieme loi de Newton:

F = masse * accélération

masse = 0.35
accélération = 1000 m/s à 35 Hz donc accélération moyenne 35 000 m/s²

F = 0.35 * 35 000 = 12.25 kN
0 x
Ce forum ነግሮሻል? እሱን እርዱት። እርሱ ሌሎችን መርዳት ለመቀጠል - በኢኮሎጂ እና በ Google ዜና ላይ ጽሑፍ ያትሙ
dedeleco
ባለሙያ ኢኮሎጂስት
ባለሙያ ኢኮሎጂስት
መልእክቶች 9211
ምዝገባ: 16/01/10, 01:19
x 6

ያልተነበበ መልዕክትአን dedeleco » 22/05/11, 02:20

D'accord, il s'agit de la force moyenne à la cadence de 2100/minute soit à 28,5ms entre chaque coup, alors que chacun dure deux millisecondes pour un canon de l'ordre du mètre, avec une force instantanée de recul bien plus forte à ce moment, à peu près 28/2=14 fois plus forte, et même plus, si le ressort est très fort pour éviter des amplitudes de mouvement très fortes, qui sinon peuvent être 14 fois et plus le recul moyen du canon avec un ressort mou et un canon léger.

Je considérais un seul coup et pas leur répétition intensive, cadence qui n'a pas grande signification avec un marteau pour enfoncer un clou ou un pieu, où la force max au moment du choc est ce qui compte, et pas la force moyenne.
La résistance mécanique du canon est déterminée par cette force maximum et son échauffement.

De tout manière c'est assez HS pour les problèmes de santé sur les effets de cet cochonnerie.
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dedeleco
ባለሙያ ኢኮሎጂስት
ባለሙያ ኢኮሎጂስት
መልእክቶች 9211
ምዝገባ: 16/01/10, 01:19
x 6

ያልተነበበ መልዕክትአን dedeleco » 22/05/11, 03:35

Pour l'effet sur la santé lire le long rapport déjà mentionné sur econologie sur les effets des radiations par l'EU :
page 153 un long chapitre sur les effets sur la santé de l'uranium appauvri à lire pour comprendre les erreurs officielles qui font refuser les effets réels des nanoparticules d'uranium appauvri inhalé !!

የመስኖ ልማት አደጋ ላይ የአውሮፓ ኮሚቴ ፡፡
http://www.euradcom.org/2011/ecrr2010.pdf

የዩራኒየም መሣሪያዎች-ለምን ሰልፉ ለምን አስፈለገ?
http://www.unidir.ch/pdf/articles/pdf-art2758.pdf

Ce rapport ne semble pas avoir été lu sur éconologie avec soin !!

C'est une horreur toxique très sous estimé qui empoisonne nos vies avec un effet 1000 fois plus élevé que celui admis officiellement par le nucléaire, physiciens qui ignorent la biologie réelle !!


The scientific investigation of DU gives a curious condensed echo of the earlier investigations into the nuclear site child leukemias. This is not surprising given the political consequences of having to concede that the low doses of DU, conventionally assessed, were capable of causing such graphic and appalling genetic effects on populations exposed to the dust. For if this could happen with Uranium, it means that all of the basic equations and assumptions of the risk model are wrong. The matter has been painstakingly researched and reviewed recently by an American academic, Paul Zimmerman whose conclusions, independently gained by an academic, closely agree with the ECRR thesis developed in 2003 and in the present 2010 report (Zimmerman 2008).
It is an interesting fact that the military and the nuclear industry internally take Uranium exposure very seriously as far as handling the material is concerned. Spills, even small ones have to be dealt with, with all the rigours associated with contamination by radioactive material. The same is true for the military, ማን publish internal documents warning of the health effects. However, as soon as the Uranium is shot from the gun and has contaminated the theatre of war, it suddenly becomes benign, in all the reports of the issue, and in the denials of the military and its risk agencies and those of the governments involved.
The effects of exposure to Uranium are not, of course, restricted to DU and passive weapons fallout. Uranium is increasingly contaminating the environment, near nuclear sites, near isotope separation plants, near fuel manufactories, near Uranium mines and in atomic and thermonuclear weapons fission fallout, near and remote from the test sites. Uranium is increasingly found in food and drinking water as it is a significant component of agricultural fertilizer. It is therefore also found near fertilizer factories and phosphate mines and in the transportation of phosphate ore and its agricultural products
The mining of Uranium began at the beginning of the last century. Also beginning at the same time was a new disease: childhood leukemia, which is believed to result from a mutation in utero. The temporal correlation between the incidence of this disease and the production of Uranium (modeled as Radium) is startling,
Owing to the high density of Uranium, (19 g.cm-3 metal and 10.96 g. cm-3 for the dioxide) and the fact that the metal is pyrophoric (burns in air) the substance is used in the manufacture of armour piercing shells, missile nose cones and penetrators. It is also employed in certain ballast materials in some aircraft (e.g. helicopter rotors, commercial aircraft counterweights). As a weapon, on impact, the DU burns to a fine aerosol of ceramic Uranium oxide particles of mean diameters from about 1000nm (down to below 100nm depending on different study results and distances from targets. These particles are long lived in the environment (and in tissue), and can travel significant distances from the point of impact up to thousands of miles (Busby and Morgan 2005). They become resuspended in air, are found in air filters in cars at some distance from the attacks, and are respirable. Because their diameters are so small, below 1000nm, they are able to pass through the lung into the lymphatic system and in principle can lodge anywhere in the body. Here they may remain for several years in the same place. The biological half life of such particulate Uranium is unknown but is very long. According to research with animals it can be greater than 13 years (Royal Society 2001).
A single Abrams 120mm tank shell contains about 3kg of DU (111MBq of radioactivity) and there is 275g in a 30mm GAU3A A-10 Thunderbolt Gatling Gun round. These munitions were used in Gulf War 1. More recently evidence has emerged that hard target warheads have been deployed on cruise missiles and bunker busting bombs, each containing up to one tonne of Uranium. Estimates of the quantity of Uranium used in Gulf War 2 in 2003 are as high as 1700 tonnes (Al Ani and Baker 2009).
Military penetrators explode on impact with hard targets with about 80% conversion to micron diameter Uranium Oxide particles of a ‘ceramic’ nature. These particles are highly mobile and extremely long lived in the environment, owing to the very high degree of insolubility of Uranium Oxides UO2 and U3O8. They can be inhaled and the sub-micron diameter particles are translocated from the lung to the lymphatic system, building up in the tracheobronchial lymph nodes and potentially able to circulate everywhere in the body since they incapacitate macrophages (Kalinich et al. 2002). They can pass through the skin and through most gas-mask filters.

The reason that DU is employed is that the weapons are astoundingly successful and have revolutionised warfare, rendering the tank and its armour useless. In addition, its use represents a route for the nuclear industry to rid itself of a waste product which would otherwise be expensive to dispose of. But the downside is that the material clearly represents a radiation hazard which is indiscriminate: battlefields are going to be contaminated and civilian populations are going to be exposed.

U-238 has a very long half life, 4500 million years, so owing to its much shorter half life of 24,100 years, the specific activity of Pu-239 is far greater. It is 2.3TBq/kg. But this means that 350 tons of DU (or 4.30TBq of U-238) is equivalent in activity (quantity of radiation) to about 2 kg of Plutonium-239. The ethical dimensions of the intentional scattering of 2kg of Plutonium-239 over a populated area are easy to imagine.

Despite this, there have been virtually no epidemiological studies carried out of populations exposed to weapons Uranium. The one exception is a study carried out at the request of the Italian military into cancer in the Balkans peacekeepers. The first report showed a significant excess of lymphoma (equivalent to 8-fold) in peacekeepers stationed in Bosnia and Kosovo (Italian report 2001). More recent investigation of the data shows that the cancers were mainly from those who served in Bosnia, making the relative risk more like 14-fold. A recent update on the situation seems to have been kept confidential; reports are that levels of cancer in this cohort are startlingly high and checks are being carried out.

Cancer data from Sarajevo in Bosnia has been reported, and show remarkable increases (up to 20-fold) in the incidence at many sites (Hamburg 2003). A cohort study of cervical cancer in Greece concluded that exposure to Uranium aerosols was the cause of a statistically significant increase in the disease those exposed as shown by cervical smear screening results (Papathanasiuo et al 2005). There have also been many reported of high levels of cancer in Iraq following the bombing both in 1991 and later in 2003,

The situation in Iraq has become serious: genotoxicity of Uranium exposures has resulted in a catastrophic increase in cancer and congenital disease.

A case control study of UK Atomic Test Veterans children and grandchildren identified a 9-fold excess of congenital conditions in the children and an 8-fold excess in the grandchildren relative to national controls (Busby and de Messieres 2007). These veterans were exposed mainly to Uranium since their gamma film badge doses were in general known and analysis showed the existence of significant quantities of Uranium on the test sites.
A review of the reproductive toxicity of natural and depleted Uranium by Domingo (2001) concluded that Uranium was a development toxicant when given orally or subcutaneously to mice. Decreased fertility, embryo toxicity, teratogenicity and reduced growth were shown to occur. Paternain et al (1989) had already showed developmental and birth outcome effects in mice at doses as low as 5mg/kg with no zero effect dose. A study of the effects of Uranium on the hatching success, development and survival in early stages of zebrafish (danio rerio) was reported by Bourrachot et al (2008). The authors used levels of depleted Uranium in the water of 200-500g/l (about 3Bql-1) but also employed a higher specific activity Uranium isotope U-233 to examine the effects of what they believed to be chemical rather than radiological stress. Both regimes showed significant developmental effects at the lowest exposures. 250gl-1 showed a 43% reduction in median hatching times relative to a control. A 15 day exposure to this concentration of depleted Uranium gave a 100% mortality at the pro-larval stage. The more radioactive U-233 was more effective, but both isotopes showed the effects at this very low concentration. The radiation doses at which this was occurring are vanishingly small and would not be considered harmful on the basis of current risk models.

It is clear from the results of Lestaeval et al 2005 that at levels where there is no nephrotoxicity, there are measurable changes in behaviour in rats exposed to 144g/kg. by injection. Taken together, these studies strongly suggest that Gulf War syndrome is an effect of inhalation of micrograms of Uranium and draw attention to the extraordinary neurotoxicity of the material.

When doses are calculated in terms of absorbed dose following ICRP, the quantities of Uranium usually found in the environment confer very small doses compared with natural background gamma radiation, and even smaller when compared with the levels of dose which correlated with cancer in the A-Bomb groups. But it is clear that this approach is massively in error, since it has avoided or, more accurately, knows nothing about, chemistry, biology, physiology and pharmacology. These sciences were historically considered of less importance than physics and mathematics, in some deeply felt (by the physicists anyway) philosophical and emotional way. This is the flaw in rational analysis: it is only as good as its data, and if, in order to solve a problem, it has to be reduced to the level where a solution can be claimed, the answer is often wrong.
The Committee has had to deal with this very real problem by presenting a real solution; in this case the solution is to weight Uranium exposures by a factor of 1000 at normal background gamma photon levels (100nGy/h). This will be modified when experimental results of Secondary Photoelectron effects become available. It is clear that the effects of Uranium are wide ranging, and so to consider only genetic effects from Uranium exposure would be quite wrong. In addition, different types of exposure will cause different spectra of conditions.


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