Ilm

RUBOHAK (lotiniash vulpecula, ba rusi lisichka), burjest dar Nimkurai shimolii osmon, ki ravshanoii munirtarin sitoraash az 4,4 qadri sitoravi besh nest. Sharoiti musoidi mushohida iyun. Az tamomi mintaqahoi SSSR mushohida meshavad. Nig. Osmon.  

«SADOI BARQ», mavjhoi infrasadoiero guyand, ki dar sathi bahr haygomi vazidani shamoli sakht shunida meshavad. «Sadoi barq» hangomi dar pasi qullahoi mavj paydo shudani girdob zuhur meyobad. Azbaski surati pahnoishi infrasado aa surati zabti tufon chand karat ziyod ast, az rui avzoi «Sadoi barq» khuruji tufonhoro peshgui kardan mumkin ast.

SADO, mavjhoi chandirro guyand, ki dar muhiti gazshakl, moe va sakht pahn meshavand va onhoro gushi odam qabul karda metavonad. Odam Sadoi basomadash az 16 Gs to 20000 Gs-ro meshunavad. Sadoi basomadash az 16 Gs khurd infrasado va Sadoi basomadash az 20000 Gs kalon ultrasado nom dorad. Mavjhoi chandiri balandbasomadi …

RUTENIY (lotini Ruthenium), Ru, elementi khimiyavii guruhi VIII sis-temai davrii Mendeleev, raqami atomiash 44, massai atomiash 101, 07. Yakjoya bo digar metallhoi platini vomekhurad. Yakchand mineralhoi Rutiniy az jumla osmit, aurosmirid, laurit va gayra ma¬lumand. Rutiniy metalli safedi nuqragun, dushvorgudoz va nihoyat mustahkam ast; t gud. Rutiniyro asosan az korkardi …

RUTIN, kvertseti n-z-r u t i n o z i d, payvasti organiki az guruhi flavonoidho, ki molekulaash az flavoni kvertsetin va disakharidi rutinoz tashkil yoftaast. Dar bargi sudob, buttai choy, marjumak va digar rastaniho mavjud ast. Rutin tasiri vitamini doshta, qobiliyati guzaronandagii kapillyarhoro tanzim me¬namoyad. Chun doru (beshtar hamrohi …

RUBIDIY (lotini Rubidium), Rb, elementi khimiyavii guruhi 1 sistemai davrii Mendeleev, raqami atomiash 37, massai atomiash 85,4678. Pubidiyi tabii az izotophoi sobiti 85Rb (72,15%) va kamradioaktivi 87Rb (TVs—4,8*1010 sol) tarkib yoftaast. Qarib 20 izoopi radioaktivi Rubidiy hosil karda shudaand. Rubidiyro asosan dar istehsoli katodho (baroi fotoelementho) ba kor mebarand; ba …

ROMBOEDR (az romb va yunoni hedra — asos, ruya), dar matematika, parallelepipedest, ki hamai ruyahoyash az rombhoi barobar iboratand.

ROBITA (arabi), dar falsafa aloqa, vobastagii mutaqobilai mavjudoti olam. Robita yake az mafhumhoi asosii materializmi di¬alektiki ba hisob meravad. Durustii marifati inson ba durust muayyan namudani Pobitai hodisahoi gunoguni olam vobasta buda, sababu natija va shaklhoi gunogunand. Hamai hodisavu prosesshoi olam bayni khud Robita dorand, chu¬nin ast mazmuni yake az …

ROBITAHOI ZAMINIYu OFTOBI, tasiri tagyiroti huruji Oftobro ba hodisoti zamini guyand. Saviyai khuruji Oftob (miqdori sohahoi faol va doghoi Oftob, miqdor va iqtidori afrukhthoi oftobi va gayra) bo davri taqriban 11-sola tagyir. meyobad. Dar Zamin davri 11-sola dar yak qator hodisahoi tabiati organiki va gayriorganiki (oshubhoi maydoni magniti, fajri qutbi, …

RIJL (arabi — poy), munirtarin sitorai burji Jabbor ast, ki qadri sitoravii zohiriash 0,1 meboshad. Az Oftob dar masofai 330 parsek voqe gardida, ravshanoiash az ravshanoii Oftob 81 marotiba ziyod ast.