
heinrich velkar

heinrich johann velkar (9 september 1912, ingolstadtlo-25 december 1981, erlangenlo) oka german saiddhaantika mariyu anuvartita bhouthika shaastravetta, athanu "transistron" nuu kanugonnadu, idhi bell prayogasaalalo tayaaru chesina modati vijayavantamaina transister nundi swatantramgaa westinghouselo tayaaru cheyabadina transister. athanu III-V sammelanam semiconductorlalo praathamika pani chesaadu mariyu microwave semiconductor elements mariyu lazer diodlaku maargam sugamam chesaadu.
jeevita charitra mariyu mukhyamaina rachana.
1931loe praarambhinchi, velkar arnald somerfeld aadhvaryamlo munich vishwavidhyaalayamlo chaduvukunnadu, mariyu ataniki Ph.dii. 1936loe somerfeld raasina "electrodynamics-lectures aann theoretical physics valume III" anae pustakam 1933/1934 sheethaakaala semister samayamlo velkar tayaaru chesina upanyaasa gamanikalapai aadharapadi undhi. 1939loe somerfeld aadhvaryamlo velkarku nivaasam manjuru cheyabadindi.
yuddha samvatsaraalalo, 1940 nundi 1945 varaku, velkar oberphaphenhophenloni luftfunkforces samsthalo panicheesaaru, conny ippatikee munich vishwavidhyaalayamloni class clusius yokka bhouthika rasayana samsthatho anubandhaanni (1942 nundi 1944 varaku) konasaaginchaaru. yuddham taruvaata, 1947-1951loe, athanu paarislooni westinghouse anubandha samstha, compagny dess freens ett signox westinghouselo udyogam teesukunnadu. 1951 nundi 1961 varaku, velkar erlangenloni seamens-skertwerke yokka salid-state physics vibhaagaaniki naayakatvam vahinchaadu, akkada athanu silicon semiconductorla sthaanamlo kotta, III-V sammelanaalanu abhivruddhi chesaadu. ayana chesina pani phalitamgaa galvanomagnetic mariyu optoelectronic prabhavalanu pedda ettuna upayoginchadam jarigindi, alaage microelectronicslo kotta switching circuitlu upayoginchabaddaayi. velkar mariyu athani vibhagam microwave semikandaktarlu mariyu lazer diodlaku maargam sugamam chesaayi. 1961 nundi 1969 varaku erlangen simens-skertwerke parisoedhanaa prayogasaalaku directorga panicheesaaru. 1969 nundi 1977loe padavee viramana chese varaku, velkar company yokka anni parisoedhanaa prayogasaalalaku directorga unnaaru.
paarislooni westinghouse anubandha samsthalo unnappudu, velkar mariyu german bhouthika shaastravetta herbert eff. matare oka point contact semiconductor amplifiernu abhivruddhi chesaaru, dheenini juun 1948loe pradarsinchaaru. idhi 1948 juun 30naa bell laboratory saastravettalu point contact transister pradarsana gurinchi chesina prakatanatho samanamga undhi. french westinghouse anubandha samstha 13 augustu 1948naa adhe rakamaina parikarampai patent kosam darakhaastu chesindi. 1949 mae 18naa, eee european aavishkarananu "lae transistron" ledhaa "french transister" gaa prajalaku andinchagaa, modati batch 1,000 parikaraalanu french telecommunications kosam tayaaru chesaaru. eee abhivruddhi german radarnu abhivruddhi chese karyakramalalo germanylo swatantramgaa iddaroo chesina pani yokka perugudala. french patent 1952loe manjuru cheyabadindi.
velkar 1977loe duesh physicalische gesselshaft adhyakshudiga ennikayyaaru.
simens egg, munich, 1976loe III-V compound semiconductor developmentlo velkar maargadarsaka krushini gowravinchadaaniki heinrich velkar memorial avaardunu sthaapinchaaru.

