isi tarah, 7-Eleven, ek nae sampark-mukt bhugataan pranaali ko badhaava dene ke liye MasterCard ke saath kaam kar raha hai. pareekshan mein shaamil hone vaalon ko ek maanaarth nokiya 3220 selafon diya jaata hai - sakriykaran ke baad, ise ek RFID saksham maastarkaard kredit card ke roop mein, duniya bhar ki 7-Eleven ki kisi bhi shrrunkhala mein istemaal kiya ja sakta hai.[12]
Britain mein, RFID praudyogiki ka upayog karke, saarvajanik parivhan ke aseemit prayog ke liye poorv bhugataan ki sanchaalan pranaali ko taiyaar kiya ja raha hai. yeh design kreditkaard sadrush paas mein antarnihit hai, jise jab scan kiya jaata hai to paas ke vaidh hone ka vivran aur us paas ke vaidh hone ke dinon ka pata chalta hai. pehli baar ise laagoo karne waali company nautingham shahar ki NCT company hai, jahaan aam janta pyaar se ise "beep card" kehti hai. iske baad ise safalataapoorvak London mein laagoo kiya gaya, jahaan "oyastar card" pe-aij-you-go yaatra ki anumati deta hai saath hi saath vibhinn samayaavadhi aur vibhinn kshetron ke liye maanya paas ki bhi anumati hai.

radio-aavrutti pehchaan (angreji: Radio-frequency identification) ek vastu ka upayog hai (aamtaur par ek RFID taig ke roop mein sandarbhit) jise ek utpaad, pashu, ya vyakti mein radio tarangon ke istemaal se pehchaan karne aur traiking ke uddeshya se lagaaya ya daala jaata hai. kuchh taig ko kai meter door se aur paathak ki drushti rekha ke paar se padha ja sakta hai.


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kai deshon mein dhoomrapaan ki umr nirdhaarit hai, sanyukt raajya America sahit kai deshon, Europeeya sangh ke adhikaansh sadasya raajyon, New Zealand, Canada, dakshin Africa, isaraail, Bhaarat, Brazil, chili, kosta rika aur Australia mein tambaakoo utpaadon ko naabaaligon ko bechana avaidh hai aur Netherland, ostriya, Belgium, Denmark aur dakshin Africa mein 16 se kam aayu ke logon ko tambaakoo utpaad bechana avaidh hai. 1 sitmbar 2007 ko Germany mein tambaakoo utpaadon ko khareedne ki nyoonatam aayu badhaakar 16 se 18 kar di gayi aur usi ke saath saath great Britain mein bhi 1 October 2007 se yeh seema 16 se 18 kar di gayi.[98] sanyukt raajya America ke 50 mein se 46 raajyon mein nyoonatam aayu 18 varsh hai, Alabama, alaaska, new jersey ke alaava, yoota aur jahaan kaanooni umr 19 varsh hai (New York ke uttari raajya onondaga County ke saath hi saath New York ke lambe aaisalaind ki County sufafolk aur nassoo mein bhi).[krupaya uddharan jodein] kuchh deshon mein tambaakoo utpaadon ko (arthaat khareedne par) bachchon ko dene aur yahaan tak ki dhoomrapaan karne ke kaarya mein sanlagn bachchon ke khilaaf bhi kaanoon hain.[krupaya uddharan jodein] aise kaanoonon ki antarnihit dhaarana hai ki log tambaakoo ke istemaal ke jokhim ke baare mein jaankaar hi upayog ke sambandh mein nirnaya lein. in kaanoonon mein kuchh deshon aur raajyon ne ek dheela pravartan kiya hai. anya kshetron mein cigarette abhi bhi bachchon ko bech rahe hain kyonki ullanghan ke liye jurmaana kam hain ya tulanaatmak roop se bachchon ko bechana laabhakaarak hai.[krupaya uddharan jodein] haalaanki cheen, Turkey aur kai anya deshon mein aam taur par ek bachche ko tambaakoo utpaadon ko khareedne mein kam mushkil ka saamana karna padta hai kyonki aksar unase apne maata-pita ke liye tambaakoo khareedne ke liye dukaan jaane ko kaha jaata hai.
hamesha ki tarah ek tulyakaalik anukramik state machine ko ek sanyojan laujik mein vibhaajit karke laagoo karne ka vyaavahaarik tareeka hota hai aur flip flop ke set ko "state rajistar" kaha jaata hai. har baar ek ghadi tik tik ki signal deti hai aur state rajistar sanyojan laujik ke pichhle state se utpann pratikriya par kabja kar leti hai aur state machine ke sanyojan bhaag mein aparivrtineeya input ke roop mein fir se ise daal deti hai. sanyojan laujik mein samay ke khapat vaale adhikaansh laujik aakalan dvaara ghadi ki sabse tej dar set hoti hai.
prativedan ke liye engineer digital system ke prakaaron par vichaar karte hain. adhikaansh digital system "sanyojan system" aur "anukramik system" mein vibhaajit ho jaate hain. sanyojan pranaali mein hamesha jo input diya jaata hai vahi aautaput vah deta hai. yeh mool roop se laujik prakriya ke set ka pratinidhitv karta hai aur jiski charcha pehle hi ki ja chuki hai.

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