#accaddeoggi 2 marzo 1896: Becquerel scopre la radioattività

Grandi scoperte scientifiche

Antoine Henri Becquerel (Parigi, 15 dicembre 1852 – Le Croisic, 25 agosto 1908) si avvicinò alla scienza grazie al padre e al nonno, entrambi fisici di fama che avevano insegnato al "Muséum national d'histoire naturelle" di Parigi.

La scoperta dei raggi X nel 1895, da parte di Wilhelm Conrad Röntgen, lo indirizzò a sperimentare le relazioni esistenti fra raggi X e fluorescenza.

I suoi studi lo portarono a concludere che la radiazione era un evento naturale e non necessariamente indotto da una fonte di energia esterna, sia essa luce solare o altra fonte artificiale. Il 2 marzo del 1896 espose i risultati all'Accademia francese delle Scienze e da questo giorno si cominciò a parlare in Fisica di radioattività, originata dalla disintegrazione, spontanea o provocata, di un nucleo atomico con conseguente emissione di radiazioni elettromagnetiche.

La radioattività

redazione
parte di: Accadde oggi ...

02/03/2017

Powered by eZ Publish™ CMS Open Source Web Content Management. Copyright © 1999-2014 eZ Systems AS (except where otherwise noted). All rights reserved.

eZ debug

Clear cache:

Quick settings:

Timing: Mar 03 2025 18:28:30
Script start
Timing: Mar 03 2025 18:28:30
Module start 'layout'
Timing: Mar 03 2025 18:28:30
Module start 'content'
Timing: Mar 03 2025 18:28:30
Module end 'content'
Debug: ezpI18n::translateText Mar 03 2025 18:28:30
Missing translation for message in context: 'kernel/navigationpart' with comment: 'Navigation part'. The untranslated message is: 'contentclassmanager'
Debug: ezpI18n::translateText Mar 03 2025 18:28:30
Missing translation for message in context: 'kernel/navigationpart' with comment: 'Navigation part'. The untranslated message is: 'Apps'
Debug: ezpI18n::translateText Mar 03 2025 18:28:30
Missing translation for message in context: 'kernel/navigationpart' with comment: 'Navigation part'. The untranslated message is: 'Amministrazione Trasparente'
Debug: ezpI18n::translateText Mar 03 2025 18:28:30
Missing translation for message in context: 'kernel/navigationpart' with comment: 'Navigation part'. The untranslated message is: 'eZTags'
Error: eZTemplate @ extension/ocbootstrap/design/ocbootstrap/templates/canonical_link.tpl:1[0] Mar 03 2025 18:28:30
Unknown template variable 'pagedata' in namespace ''
Error: eZTemplate @ extension/ocbootstrap/design/ocbootstrap/templates/canonical_link.tpl:1[0] Mar 03 2025 18:28:30
Unknown template variable 'pagedata' in namespace ''
Timing: Mar 03 2025 18:28:30
Script end

Main resources:

Total runtime0.6278 sec
Peak memory usage27,648.0000 KB
Database Queries110

Timing points:

CheckpointStart (sec)Duration (sec)Memory at start (KB)Memory used (KB)
Script start 0.00000.0401 4,816.46091,693.9531
Module start 'layout' 0.04010.0143 6,510.4141679.1406
Module start 'content' 0.05440.5372 7,189.554717,526.7891
Module end 'content' 0.59160.0361 24,716.34381,422.5547
Script end 0.6277  26,138.8984 

Time accumulators:

 Accumulator Duration (sec) Duration (%) Count Average (sec)
Ini load
Load cache0.02704.2992350.0008
Check MTime0.00370.5928350.0001
PostgreSQL Cluster
DB queries0.01282.0412130.0010
Postgresql Total
Database connection0.00370.595610.0037
Postgresql queries0.365658.22811100.0033
Looping result0.00000.000000.0000
MySQL Cluster
DFS operations0.00030.053110.0003
TS translator
TS init0.00811.287270.0012
TS cache load0.00550.878970.0008
TS context load0.00390.617470.0006
Template Total0.510481.330.1701
Template load0.113218.025030.0377
String conversion in template resource0.00050.0870230.0000
Template parser: create text elements0.01512.4038230.0007
Template parser: remove whitespace0.00260.4115230.0001
Template parser: construct tree0.079912.7255230.0035
Template load and register function0.01171.8633100.0012
Template processing0.397163.253630.1324
states
state_id_array0.00210.330320.0010
state_identifier_array0.00300.478830.0010
Override
Cache load0.072011.4745290.0025
Sytem overhead
Fetch class attribute can translate value0.00370.584510.0037
Fetch class attribute name0.00350.564850.0007
XML
Image XML parsing0.00620.994210.0062
class_abstraction
Instantiating content class attribute0.00010.009950.0000
OCoembed
http://www.cbt.biblioteche.provincia.tn.it/oseegenius/resource?uri=2322540.00010.018010.0001
General
String conversion0.00020.0271250.0000
Note: percentages do not add up to 100% because some accumulators overlap

CSS/JS files loaded with "ezjscPacker" during request:

CacheTypePacklevelSourceFiles
CSS0design/base/stylesheets/core.css
JS0extension/ocmaps/design/standard/javascript/leaflet.js
extension/ocbootstrap/design/ocbootstrap/javascript/insertmedia.js

Templates used to render the page:

UsageRequested templateTemplateTemplate loadedEditOverride
1node/view/full.tplfull/article.tplextension/oc_tcu/design/tcu/override/templates/full/article.tplEdit templateOverride template
1parts/opengraph_set_persistent.tpl<No override>extension/ngopengraph/design/standard/templates/parts/opengraph_set_persistent.tplEdit templateOverride template
2content/datatype/view/ezxmltext.tpl<No override>extension/ocembed/design/standard/templates/content/datatype/view/ezxmltext.tplEdit templateOverride template
4content/datatype/view/ezxmltags/paragraph.tpl<No override>extension/ocbootstrap/design/ocbootstrap/templates/content/datatype/view/ezxmltags/paragraph.tplEdit templateOverride template
1atoms/image.tpl<No override>extension/oc_tcu/design/tcu/templates/atoms/image.tplEdit templateOverride template
1content/datatype/view/ezimage.tpl<No override>extension/oc_tcu/design/tcu/templates/content/datatype/view/ezimage.tplEdit templateOverride template
1content/datatype/view/ezxmltags/link.tpl<No override>extension/ocbootstrap/design/ocbootstrap/templates/content/datatype/view/ezxmltags/link.tplEdit templateOverride template
1content/datatype/view/ezstring.tpl<No override>design/standard/templates/content/datatype/view/ezstring.tplEdit templateOverride template
1content/datatype/view/ezobjectrelationlist.tpl<No override>extension/oc_tcu/design/tcu/templates/content/datatype/view/ezobjectrelationlist.tplEdit templateOverride template
1content/view/embed.tpl<No override>extension/ocbootstrap/design/ocbootstrap/templates/content/view/embed.tplEdit templateOverride template
1parts/social_buttons.tpl<No override>extension/oc_tcu/design/tcu/templates/parts/social_buttons.tplEdit templateOverride template
1atoms/meta.tpl<No override>extension/oc_tcu/design/tcu/templates/atoms/meta.tplEdit templateOverride template
1print_pagelayout.tpl<No override>design/standard/templates/print_pagelayout.tplEdit templateOverride template
1page_head.tpl<No override>extension/oc_tcu/design/tcu/templates/page_head.tplEdit templateOverride template
1parts/opengraph_persistent.tpl<No override>extension/ngopengraph/design/standard/templates/parts/opengraph_persistent.tplEdit templateOverride template
1canonical_link.tpl<No override>extension/ocbootstrap/design/ocbootstrap/templates/canonical_link.tplEdit templateOverride template
1link.tpl<No override>extension/oc_tcu/design/tcu/templates/link.tplEdit templateOverride template
1page_mainarea.tpl<No override>design/standard/templates/page_mainarea.tplEdit templateOverride template
1page_warning.tpl<No override>design/standard/templates/page_warning.tplEdit templateOverride template
1page_copyright.tpl<No override>design/standard/templates/page_copyright.tplEdit templateOverride template
1setup/debug_toolbar.tpl<No override>design/standard/templates/setup/debug_toolbar.tplEdit templateOverride template
1setup/clear_cache.tpl<No override>design/standard/templates/setup/clear_cache.tplEdit templateOverride template
1setup/quick_settings.tpl<No override>design/standard/templates/setup/quick_settings.tplEdit templateOverride template
 Number of times templates used: 27
 Number of unique templates used: 23

Time used to render debug report: 0.0008 secs

DEV 192.168.105.41