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Program Description The Department of Labor's Unemployment Insurance (UI) programs provide unemployment benefits to eligible workers who become unemployed through no fault of their own, and meet certain other eligibility. Wenzhou University Chinese Language Training Program . Letter of guarantee. The guardian should write out his/her name, nationality, occupation and address (if an organization acts as the guardian, reference to the organization should be made clear). Wenzhou University in China. The Chemical Engineering program (International) at Wenzhou University aims to train.Passport photo. A recent passport- sized photo of the applicant. Photocopy of valid passport With name, passport number & expiration date, and photo included. Kean University-Wenzhou is a 500-acre. Wenzhou-Kean University is a Chinese-American jointly established higher education institution with Independent. Wenzhou University Aviation school About me Proud Bsu aliumni! My position and life in china My mission 1. To initiate cooperation between BSU and WZU GA institute by priding preliminary details of our institution. China Celebrates Dragon Boat Festival During Wor. New Online Mandarin Teaching Resource Launched i. Business Program Taught in English at Beijing Fo. China Adopts More Open Policy to Attract Foreign. Wenzhou University is a. The undergraduate program encompass 10. Chinese Literature 3+1 bachelor degree program, Asia study, Study & Teach in China, Chinese Training lessons. Wenzhou University Online Admission System for International Students,Appy for Programs Online. Short-term Chinese Language Training Program: Non-Degree: Chinese : RMB 6,000 In total: Subject to approval: Apply: Social. Historic Battle Ensign Finds Home at University of Washington ROTC Unit. Massick was a graduate of the UW NROTC program in 1954. Western Washington University. University Catalog; Research; Student Services. The George Washington University. The tradition of training college students for military leadership began in 1819 at what is now Norwich University. ROTC Colleges - Find the Best Colleges with ROTC Programs. ROTC College Programs. Welcome to ROTC Colleges. We have everything you need to make your life easier as you begin your search for colleges with Army, Navy, and Air Force ROTC programs. Also useful are the articles and interviews where you can find more information about everything from apply to ROTC colleges, preparing to earn a degree, even ROTC scholarships. Find Colleges and Universities with ROTC Programs by Location. ROTC Program Requirements. The Reserve Officers. ROTC students receive extensive training concurrent to the pursuit of their choice of college degree. Many students are enticed to join an ROTC program administered at one of over 1,0. In addition to tuition reimbursement, students may receive monthly cash stipends and uniform allowances. In return, students awarded an ROTC scholarship must accept a variety of responsibilities. The primary responsibility assumed by an ROTC student is to enter an extensive period of active military service following graduation. Each branch of the armed forces sets its own service period. Information about University of Washington ROTC program, registering in a technical degree program, and taking free practice tests online. If your considering entering a rotc program in college or just looking for a list of top schools that offer. Welcome to ROTC Colleges.com. The terms of duty range from four to 1. In addition, ROTC students engage in rigorous military training throughout their college careers. Further requirements for members of the Reserve Officers. The academic component of an ROTC program is the same as for a non- ROTC student. ROTC programs do not automatically accept applicants. Each candidate is required to: Be a citizen of the United States. Hold a high school diploma or GED. Have a GPA of at least 2. Pass military physical fitness standards. Meet minimum and maximum age requirements, which vary by branch. Students who meet the standards, are willing to devote their time and embrace the extra work demanded of them by an ROTC program can anticipate rewarding military as well as post- military careers. Countless alumni of the ROTC program attest that the experience is invaluable and improves one. Army ROTC College Scholarship Search. California Polytechnic State University - San Luis Obispo (8. School Type : Hispanic- Serving Institution. This school offers the following additional incentives to students taking Army ROTC : Academic Credit for all Military Science courses, Advanced and Basic Camp training. Please contact the California Polytechnic State University - San Luis Obispo at the number above for more information about this program. California State University - Fresno(5. School Type : Four- year State University. This school offers the following additional incentives to students taking Army ROTC : Military Science major. Priority registration for contracted cadets. Low- cost university. Fresno city college within 6 miles. Four- year BSN nursing program. Two- year city college within 6 miles that offers ROTC with a two- year nursing program. Wide variety of undergraduate and graduate engineering programs. Nearby Yosemite and Sequoia National Parks. Please contact the California State University - Fresno at the number above for more information about this program. California State University - Fullerton(7. School Type : Hispanic- Serving Institution. This school offers the following additional incentives to students taking Army ROTC : Academic credit for ROTC Courses and offer a Military Science minor. Priority registration for contracted cadets. Students at the following schools can take Army ROTC classes through the program at California State University - Fullerton : Biola University. Cerritos College. Chapman University. Cypress College. Fullerton College. Golden West College. Mount San Antonio College. Orange Coast College. Rancho Santiago College. Vanguard University. Whittier College. Please contact the California State University - Fullerton at the number above for more information about this program. Claremont- Mc. Kenna College(9. School Type : Uncategorized. This school offers the following additional incentives to students taking Army ROTC : Full room and board match to the Army ROTC scholarship for students enrolled at: Claremont Mc. Kenna College, Azusa Pacific University, and California Baptist University. Students at the following schools can take Army ROTC classes through the program at Claremont- Mc. Kenna College : Azusa Pacific University. California Baptist University. California State Polytechnic University, Pomona. California State University - San Bernardino. Chaffey College. Citrus College. Harvey Mudd College, Claremont. Loma Linda University, Loma Linda. Mount San Antonio College. Occidental College. Pitzer College. Pomona College, Claremont. Scripps College, Claremont. University of California at Riverside, Riverside. University of La Verne. University of Redlands, Redlands. Please contact the Claremont- Mc. Kenna College at the number above for more information about this program. San Diego State University(6. School Type : Hispanic- Serving Institution. This school offers the following additional incentives to students taking Army ROTC : Students at the following schools can take Army ROTC classes through the program at San Diego State University : California State University San Marcos. Grossmont College. Mesa College. Mira Costa College. Miramar College. Palomar College. Point Loma Nazarene College. Southwestern College. University of California - San Diego. University of San Diego. Please contact the San Diego State University at the number above for more information about this program. Santa Clara University(4. School Type : Uncategorized. This school offers the following additional incentives to students taking Army ROTC : Free room and board during all 4 years for 3- year AD and 4- year ROTC scholarship cadets. Academic credit for ROTC courses and Basic and Advanced Camp training. Students at the following schools can take Army ROTC classes through the program at Santa Clara University : Foothills College. Mission College. San Jose State University. Stanford University. West Valley College. Please contact the Santa Clara University at the number above for more information about this program. University of California - Berkeley(5. School Type : Hispanic- Serving Institution. This school offers the following additional incentives to students taking Army ROTC : Students at the following schools can take Army ROTC classes through the program at University of California - Berkeley : California State University East Bay. Saint Mary's College. Mills College. Please contact the University of California - Berkeley at the number above for more information about this program. University of California - Davis(5. School Type : Uncategorized. This school offers the following additional incentives to students taking Army ROTC : Students at the following schools can take Army ROTC classes through the program at University of California - Davis : California State University - Sacramento. Simpson University. Please contact the University of California - Davis at the number above for more information about this program. University of California - Los Angeles(3. School Type : Public. This school offers the following additional incentives to students taking Army ROTC : Academic credit for all ROTC classes (general education)Students at the following schools can take Army ROTC classes through the program at the University of California - Los Angeles or at California State University Northridge: California State - Los Angeles. Loyola Marymount University, Los Angeles. Pepperdine University. The Master's College. National University. Please contact the University of California - Los Angeles at the number above for more information about this program. University of California - Santa Barbara(8. School Type : Hispanic- Serving Institution. This school offers the following additional incentives to students taking Army ROTC : Please contact the University of California - Santa Barbara at the number above for more information about this program. University of San Francisco(4. School Type : Uncategorized. This school offers the following additional incentives to students taking Army ROTC : Free room and board for ROTC scholarship cadets. Application fee waived for ROTC students. Monetary exemption to credit overload policy for ROTC students. Academic credit for ROTC courses as electives. Please contact the University of San Francisco at the number above for more information about this program. University of Southern California(2. USC, (5. 62) 9. 85- 5. Long Beach, (3. 10) 2. Dominguez Hills. School Type : High Cost. This school offers the following additional incentives to students taking Army ROTC : University of Southern California provides $4,0. USC School of Engineering: up to $3,0. Department of Military Science is provided an annual budget of $4. An additional $5,0. Nursing students can take classes and work towards their degrees at California State University, Long Beach and Dominguez Hills. Students at the following schools can take Army ROTC classes through the program at University of Southern California : Please contact the University of Southern California at the number above for more information about this program. Workout Trainer - Best Online Personal Training Programs. Administrative Assistant Training Schools - School Ratings/Rankings. TRUSTED SITEreal estate classes in ctpsychology graduate degree onlinecolumbia university business school ranking. Administrative assistant training schools administrative assistant training schools Crucial to career change is assessing what truly engages your professional self. This should not be a vague or casual whim. This needs to be a fully formed idea with direction and shape. You may be at a different phase of your life, with different values, interests, and priorities, and these may guide you toward a specific path. Or you may have accomplished all you can, or want, in your current career, and are looking for a fresh challenge. Students earning degrees online have many advantages when it comes to career training. One of the foremost is that they can be working in a full- time position while going to school. These students often are working in their field of choice and earn an online degree to expand upon the knowledge and skill set that they already have from their respective careers. Education can be an investment. For many people, a degree results in a more valuable and competitive position in the job market: promotion within a company, mobility within an industry, a higher base salary and rate of increase. According to sources like the Bureau of Labor Statistics and the U. S. Department of Education's National Center for Education Statistics, employees with a college degree tend to earn more money and face less unemployment than coworkers without the advantage of higher education. Thanks for the valuable information about training after the 12 week program. Find the best graduate program for you using the US News Best Graduate Schools rankings. Search for an ICF-approved training program with our Training Program Search Service (TPSS). The mission of LA’s BEST is to provide a safe and supervised after school education, enrichment and recreation program for school children ages 5 to 12 in the City of Los Angeles. See the rankings for the best undergraduate accounting programs at. 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Program Khidmat Bantu Di Rumah adalah amat diperlukan oleh. Folio Sivik Form 5 Khidmat Masyarakat. Program Latihan Khidmat Negara. Senarai Pusat Latihan/Kem PLKN. Program; Senarai Program. Jadual 2016; Jadual 2015; Jadual 2014; Rakan Industri SIPK. Khidmat masyarakat ialah kerja-kerja kemasyarakatan yang dilaksanakan secara berkumpulan dan mempunyai matlamat serta tujuan tertentu. Program Khidmat Masyarakat merupakan sebahagian dari kursus wajib yang perlu diambil oleh pelajar semseter 1 UUM PJJ cawangan Kelantan. Melalui mata pelajaran ini pelajar dikehendaki merancang, melaksanakan dan membuat laporan. Contoh muka hadapan : PROJEK KHIDMAT MASYARAKAT PENDIDIKAN SIVIK DAN KEWARGANEGARAAN TINGKATAN 2 Tema : Hidup Bermasyarakat Nam. Percutian Tanah Tinggi (Genting Highlands) - Part 1. BUKU UNTUK PROGRAM LDP. Akta Pertubuhan 1. Sek. 9 Akta Koperasi 1. Jadual Program Latihan Certified Security Guards. Khidmat Masyarakat; Senarai Borang Mengikut Bahagian. Khidmat Masyarakat; Rayuan Senjata Api. Khidmat Masyarakat Posted in Pasukan Sukarelawan Malaysia (RELA) Peranan. Pertahanan kawasan mengikut konsep mengikut konsep yang digunapakai oleh pasukan Home Guard, iaitu memelihara keselamatan dan keamanan setempat sehingga. Program anak angkat dan khidmat bakti ini berakhir dengan majlis perasmian penutup program OPKIM dan penyerahan anak angkat. Program Operasi Khidmat Masyarakat Fakulti Perubatan 2008. Share this: Share; Like this. Badan- Badan Persatuan boleh dikategorikan kepada beberapa kelompok sosial iaitu Pendidikan, Agama, Pakaian Seragam, Pelajar dan Etnik. Memerlukan. Cth Kelab: Kelab Lions. Membuat keputusan penting berkaitan dasar dan kewangan. Tim. Presiden. Pembantu Kanan Presiden. Membantu Presiden atau memangku tugas semasa ketiadaannya. Naib Presiden. Wujud dalam organisasi besar. Disandang dua atau lebih. Tugas untuk bantu Presiden dlm aspek. Setiausaha. Jawatan ini berfungsi sebagai pencatat dan penyimpan rekod. Memanggil mesyuarat dan uruskan hal ehwal pejabat persatuan. Bil. Jawatan. Deskripsi tugas. Bendahari. Uruskan hal berkaitan kewangan samada urusan perekodan dan penentuan keluar masuk wang persatuan. Executive offio (Exco)/Pengarah. Exco berfungsi menjalankan tugas sebagaimana yg diputuskan oleh organisasi. Akan pegang satu portfolio khusus spt Kebajikan, Protokol dll. Ahli Jawatankuasa. Membantu Exco melaksanakan sesuatu rancangan/projek yg akan dilaksanakan oleh persatuan. DAN 5. 3 Perlembagaan UKM. Perlembagaan UKM 1. Perlembagaan UKM 1. Neutrinos: an introduction ? Neutrinos, as Susana Cebri. These tiny elementary particles travel through space at close to the speed of light and have no charge. They were once thought to have no mass either, but scientists now suggest that they do have a mass; it is estimated to be less than a billionth of the mass of a hydrogen atom, but the research continuesw. The existence of neutrinos, among the most abundant particles in the Universe, was first postulated by Austrian physicist Wolfgang Pauli in 1. It was not until the first nuclear power stations were built, though, that a sufficiently high flux of neutrinos (actually their antiparticles, antineutrinos; see Landua & Rau, 2. In 1. 95. 6, Clyde Cowan and Frederick Reines built two large water- filled tanks underground, mere metres away from the nuclear power plant at Savannah River near Aiken, South Carolina, USA, in which the antineutrinos interacted with the water. I am a CNRS Researcher in the Particle Physics and Cosmology group of the Laboratory of Theoretical and High Energy Physics of the CNRS and the Universit A description of nuclear fusion in the sun, and the solar neutrino problem. Hviezda alebo zastarano st Frederick Reines was awarded the Nobel Prize in Physics in 1. Clyde Cowan could not share the prize, because he had passed away in 1. Supernova theory, numerical and analytic, has made remarkable progress in the past decade. This progress was made possible by more sophisticated simulation tools, especially for neutrino transport, improved microphysics, and. Ao fim de sua vida, uma estrela pode conter tamb. Neutrinos from the primary proton–proton fusion process in the Sun. Borexino Collaboration; Affiliations; Contributions; Corresponding author; Journal name: Nature Volume: 512, Pages: 383–386 Date published: (28 August.Solar neutrino problem: Measurements of solar neutrino types were not consistent with models of the Sun's interior. Former Standard Model: Neutrinos should have been massless according to the then-accepted theory; this means. Tydens 90% van ’n ster se bestaan sit hy waterstof in helium om vanwe. Sulke sterre word hoofreekssterre of dwergsterre genoem. Die hoeveelheid helium in ’n ster se kern sal mettertyd toeneem, so ook die tempo. Introduction; How does the sun work? History; Status of the standard solar model today; Helioseismology; Solar neutrino problems. Neutrinos expected from the sun; Solar neutrino experiments; Solar. Neutrinos come in three types or flavours, according to the standard model of particle physics (see image below): the electron neutrino, muon neutrino, and tau neutrino, which have all been confirmed experimentally. Neutrinos come in three types or flavours, according to the standard model of particle physics (see image below): the electron neutrino, muon neutrino, and tau neutrino, which have all been confirmed experimentally. For the detection of the muon neutrino, Leon M Lederman, Melvin Schwartz and Jack Steinberger were awarded the Nobel Prize in Physics in 1. A fourth, . Were sterile neutrinos to be found, a new realm of physics beyond the standard model would open up. The Super- Kamiokande tank,nearly full of water, seenfrom above. Click to enlargeimage. Image courtesy of Kamioka. Observatory, ICRR (Institutefor Cosmic Ray Research), The. University of Tokyo. Even the three confirmed types of neutrinos are special: they oscillate from one flavour to another . This phenomenon was first observed in 1. Japanese Super- Kamiokande experimentw. A recent experiment has now successfully observed such an event from the other perspective . In 2. 00. 1, the Solar Neutrino Observatoryw. Canada demonstrated that they changed into neutrinos of other flavours on their way to Earth (Bahcall, 2. Further experiments to analyse neutrino oscillations are underway, for example in France and Japan, where accelerators and nuclear power stations provide large numbers of antineutrinos for observationw. Where do neutrinos come from? Neutrinos first originated some 1. Big Bang. A mere second later, they were already rapidly moving away from the rest of the hot and dense primary particle soup; scientists are still seeking to detect neutrinos that survive from the Big Bang. It is neutrinos. Unlike most other particles, neutrinos are able to escape from dense regions such as the core of the Sun or the Milky Way, and can they travel long distances from far- away galaxies without being absorbed, carrying information about these areas. In this sense, neutrinos are cosmic messengers, and neutrino astronomy is becoming increasingly important. So far, only two sources of extraterrestrial neutrinos have been observed: the Sun and supernovae. Raymond Davis Jr and Masatoshi Koshiba won the third neutrino Nobel Prize in Physics in 2. Like other stars, the Sun emits electron neutrinos at several steps of the process by which light nuclei fuse into heavier ones (see image below, and to learn more, see Westra, 2. Boffin & Pierce- Price, 2. Earth every second. Unlike photons, which take about 1. Sun to its outer photosphere before speedily travelling to Earth, neutrinos released in the same fusion process do the entire trip in a mere 8 minutes. This is why solar neutrinos are useful messengers carrying information about the current fusion processes inside the Sun, such as the chemical composition of its corew. An artist. To allow astronomers to prepare to observe these events, several neutrino detectors are now linked together as the Supernova Early Warning Systemw. Astronomers, however, are not the only scientists interested in neutrino detectors. On Earth, both natural and artificial neutrino sources exist: radioactive materials from inside Earth can undergo beta decay, producing geo- neutrinos. In addition, nuclear fission reactors produce neutrinos, and dedicated particle accelerators are being used as neutrino sources for research. These are interesting to particle physicists, of course, to further characterise neutrinos, but also to earth scientists and maybe even politicians (see . This most abundant source of naturally occurring neutrinos on Earth is a nuisance to neutrino astronomers (see . The recently finished Ice. Cubew. 11 is the largest detector yet: a cubic kilometre of ice at the South Pole, acting as a telescope to search for neutrinos from astrophysical sources (see images below). When a neutrino hits a proton of Antarctic ice, a muon is released. Like any charged particle travelling at more than the speed of light in a specific medium (though less than the speed of light in vacuum), the muon will generate a conical trail of blue light . It consists of thousands of autonomous digital optical modules (top right), which record the arrival time of each neutrino. They are deployed in deep holes in the ice, drilled with hot water (bottom left; click to enlarge image). When a neutrino hits a proton of Antarctic ice, a Cherenkov cone of blue light is generated (bottom right; click to enlarge image), and the path of light is reconstructed from the times of neutrino detection. Images courtesy of NSFThousands of optical sensors, in a three- dimensional grid 1. To distinguish muons that are generated from cosmic neutrinos from the millions more muons that are produced by cosmic rays in the atmosphere above the detector, Ice. Cube uses Earth as a filter, only looking at muons that come from underground. Neutrinos are the only particles able to penetrate the Earth unhindered, so any muon coming from that direction must have been newly generated in the detector from a cosmic neutrino. Other detectors use different materials and strategies . Scientists now propose that cubic- metre antineutrino detectors could be used to non- intrusively monitor and safeguard nuclear reactorsw. At present, reactors are monitored indirectly (for example using satellites, gas and dust emissions, and seismic and infrasound signatures for weapons testing), which can result in misleading data. Neutrino detectors would provide real- time information about the reactor core power and possibly even its isotopic composition. An array of about 5. The Super- Kamiokandedetector tank is filled withwater. Click to enlarge image. Image courtesy of Kamioka. Observatory, ICRR (Institute for. Cosmic Ray Research), The. University of Tokyo. Powering Earth. Neutrinos are also detected in geophysics. Natural radioactive decay of uranium, thorium and potassium in Earth. Geo- neutrinos produced during decay may help answer the question of crust composition. Geo- neutrinos were first detected in 2. Kam. LANDw. 13 experiment in Japan, although an abundance of nuclear power stations limited the studies, because the antineutrinos they release have similar energetic signatures to those of geo- neutrinos. In 2. 00. 9, an international team from the Borexino projectw. In the time that you have been reading this article, about 1. Tiny, yet with the power to confirm or overthrow a number of scientific theories. Acknowledgement. The editors would like to thank Dr Christian Buck, neutrino physicist from the Max- Planck- Institut f. Die naaste ster aan die Aarde is die Son, wat die bron is van die grootste deel van die energie op die planeet. Talle ander sterre is snags van die Aarde af sigbaar as hulle nie deur atmosferiese verskynsels verberg word nie. Die meeste duidelik waarneembare sterre is histories gegroepeer in sterrebeelde en asterismes, en die helderste sterre het alledaagse name gekry. Sterrekundiges het oor die eeue heen verskeie katalogusse saamgestel wat gestandaardiseerde name aan die sterre gee. Vir die grootste deel van sy bestaan skyn . Sterrekundiges kan die massa, ouderdom, metaalinhoud (chemiese samestelling) en baie ander eienskappe van . Die totale massa van . Ander eienskappe van . Wanneer die ster se kern dig genoeg geword het, word waterstof in helium omgesit deur kernfusie, en energie word in die proses vrygestel. Die ster se interne druk voorkom dat dit onder sy eie swaartekrag instort. Wanneer al die waterstof by die kern opgebruik is, sit . In swaarder sterre vind die samesmelting van swaarder elemente plaas by die kern of in lae om die kern. Die ster ontwikkel dan tot . Wanneer twee sulke sterre baie na aan mekaar l. Die lyne is bygevoeg. Sterre was nog altyd baie belangrik vir beskawings oor die hele w. Hulle is gebruik vir godsdienspraktyke, navigasie en ori. Baie antieke sterrekundiges het geglo die sterre l. Hulle het groepe sterre in sterrebeelde gegroepeer en hulle gebruik om die beweging van die planete en die Son te volg. Dit is nou bekend as die SN 1. Hulle het ook verskeie sterkatalogusse opgestel, soos die Boek van die Sterre (9. Persiese sterrekundige Abd al- Rahman al- Soefi, wat verskeie sterre, sterreswerms en sterrestelsels (onder meer die Andromeda- sterrestelsel) waargeneem het. Zahoor het die Persiese geleerde Abu Rayhan Biruni die Melkweg beskryf as talle fragmente wat die eienskappe van newelagtige sterre het. Hy het ook die breedtegraad van verskeie sterre tydens . In 1. 58. 4 het Giordano Bruno sommige vroe. Om te verduidelik hoekom die sterre nie . In die 1. 78. 0's het hy die sterre in . Sy seun John Herschel het sy studie in die Suidelike Halfrond herhaal en . Deur die spektrum van sterre soos Sirius met di. In 1. 86. 5 het Secchi begin om sterre volgens spektraalklasse te klassifiseer. In die 1. 9de eeu het die bestudering van dubbelsterre toegeneem. In 1. 83. 4 het Bessel veranderinge in die eiebeweging van die ster Sirius opgemerk en voorgestel dit het . Edward Pickering het in 1. Mizar se spektraallyne oor . Gedetailleerde waarnemings van baie dubbelsterre is gedoen deur sterrekundiges soos William Struve en S. W. Burnham, en so kon die massa van sterre vasgestel word uit die berekenings van hul wentelbane. Foto's het waardevolle sterrekundige instrumente geword. Karl Schwarzschild het ontdek dat die kleur van . In 1. 92. 1 het Albert Michelson vir die eerste keer die deursnee van . In 1. 91. 3 is die Hertzsprung- Russell- diagram ontwikkel. Suksesvolle modelle is ontwikkel om die binnekant van sterre en ster- evolusie te verduidelik. Cecilia Payne- Gaposchkin het in 1. Ph. D.- tesis eerste voorgestel dat sterre hoofsaaklik uit waterstof en helium bestaan. Daardeur kon die chemiese samestelling van die steratmosfeer bepaal word. Antieke sterrekykers het patrone in die sterre gesien en hulle het di. Die planete Mercurius, Venus, Mars, Jupiter en Saturnus het so hul name gekry. Die Duitse sterrekundige Johann Bayer het . Alpha Centauri, ook geskryf . Dit is bekend as Bayer- name. Dit het bekend geword as Flamsteed- name. Dit kry dan gewoonlik . So het Alpha Centauri A byvoorbeeld ook die name GJ 5. A (Gliese- Jahrei. Sulke gebiede word molekul. Hulle ioniseer ook die waterstof en so word . Wanneer die ophopings instort en die digtheid toeneem, word die swaartekragenergie omgesit in hitte, en die temperatuur styg. Wanneer die protoster- wolk min of meer die stabiele toestand van hidrostatiese ewewig bereik het, word . Hierdie voor- hoofreekssterre word dikwels omring deur . Hierdie nuwe sterre skiet strale gas uit met hul rotasie- as langs, wat die draaimomentum van die instortende ster verminder en klein kolle newelagtigheid tot gevolg het. Sulke sterre word hoofreekssterre of dwergsterre genoem. Die hoeveelheid helium in . Vir die meeste sterre is die hoeveelheid massa wat hulle so verloor nietig. Die Son verloor jaarliks 1. Baie swaar sterre kan egter 1. Die Son se leeftyd word op sowat 1. Swaar sterre gebruik hul gas vinniger op en hul leeftyd is dus korter. Kleiner sterre van minder as 0,2. Daarom kan sterre van sowat 0,2. In sterrekunde word al sulke elemente metale genoem. Die metaalinhoud (dus chemiese samestelling) het . Hierdie wolke word mettertyd metaalryker namate ouer sterre aan die einde van hul leeftyd dele van hul atmosfeer afskud. Wat met . Kernreaksies in die kern stop en die kern begin krimp onder sy swaartekrag. Die buitenste lae van die ster sit baie uit en so begin die rooireusfase. Die Son en rooireuse met . Die kern sal al hoe warmer word totdat dit . Die ster is dan nie meer . Wanneer die ster al die helium in sy kern opgebruik het, duur die fusie voort in . Sy kern sal nou ontbloot wees en dit sal . Die massa is nie groot genoeg dat verdere krimping kan plaasvind nie. Hulle sal hul buitenste lae wegstoot en . Dit sal eindelik koeler en dowwer word. Weens hul groot massa is hul leeftyd baie kort . Anders as laasgenoemde sterre, kan hulle elemente swaarder as helium verbrand. Hulle stoot dus nie hul buitenste lae weg as die helium op is nie en verloor nie genoeg massa om . Daarna vind die fusie van neon, suurstof en silikon plaas. Naby die einde van die ster se leeftyd word fusie voortgesit in . In elke laag vind die samesmelting van . Aangesien ysterkerns . Die skok van die skielike instorting veroorsaak dat die res van die ster ontplof in . Supernovas is so helder dat hulle vir . Supernovas en sterwinde speel . Die mees algemene stelsel met meer as een ster is . Om redes van stabiliteit groepeer sulke sterre hulle gewoonlik in hi. Hulle wissel van los sterverbindings met net . Dit geld veral vir Klas O- en Klas B- sterre met . Hoe kleiner die sterre, hoe kleiner is die kans egter dat hulle in so . Net 2. 5% van alle rooidwerge het sover bekend metgeselle. Aangesien 8. 5% van alle sterre rooidwerge is, is die meeste sterre in die Melkweg waarskynlik enkelsterre. Teen die wentelspoed van die Space Shuttle (8 km per sekonde of 3. Sulke afstande is tipies in . In digter gebiede soos die kern van . Hierdie ongewone sterre het . Sommige sterre kan dalk selfs byna 1. Die oudste ster wat nog ontdek is, HE 1. Die sterre met die grootste massa se leeftyd is . Die hoeveelheid swaar elemente word tipies gemeet in terme van die ysterinhoud van die ster se atmosfeer, aangesien yster die algemeenste element is en sy absorpsielyne relatief maklik is om te meet. Op die foto's is die regterkantse voorwerp telkens die linkerkantse voorwerp op die volgende foto. Omdat sterre so ver van die Aarde af is, lyk hulle almal, buiten die Son, vir die menslike oog soos ligpunte wat flikker vanwe. Die ster met die grootste skynbare grootte benewens die Son is R Doradus, met . Deur die verskil in helderheid te meet wanneer dit deur die maan verduister word of wanneer dit daarna weer verskyn, kan die ster se hoekdeursnee bereken word. Betelgeuse het egter . Die beweging van sterre kan dui op die radiale snelheid na of weg van die Son, of die booghoek waarteen dit beweeg (sy eiebeweging). Radiale snelheid word gemeet deur die Doppler- verskuiwing van die ster se spektraallyne en word aangedui in km/s. Die eiebeweging word vasgestel deur die meting daarvan in milli- boogsekondes per jaar. Deur die parallaks van . Dit is waarskynlik groepe sterre met . Die sterkte van die veld wissel na gelang van die massa en samestelling van die ster, en die hoeveelheid magnetiese aktiwiteit op die oppervlak hang af van die ster se rotasiesnelheid. Hierdie oppervlakaktiwiteit veroorsaak stervlekke, gebiede van sterk magneetveld en ondernormale oppervlaktemperature. Steropvlammings is uitbarstings van ho. Die magneetveld kan op die ster se sterwind inwerk en as . Ouer sterre soos die Son het . Hierdie generasie van supermassiewe populasie III- sterre kom egter nie meer voor nie en hul bestaan is tans net teoreties. Met . Die oppervlakswaartekrag kan die voorkoms van die ster se spektrum be. Die Klas B- ster Achernar het byvoorbeeld . Die effektiewe temperatuur is net . Die oppervlaktemperatuur van . Kleiner sterre soos die Son het temperature van . Rooireuse het relatief lae temperature van sowat 3 6. K, maar hulle het ook . Laasgenoemde vind plaas as die ster se sterwind. Hierdie energie word omgesit in ander vorme van elektromagnetiese energie van . Die ster straal ook vorme van elektromagnetiese straling uit wat nie met die blote oog gesien kan word nie. Dit dek inderdaad die hele elektromagnetiese spektrum, van radiogolwe en infrarooistrale tot ultraviolet, X- strale en gammastrale. Deur die ster se spektrum te bestudeer, kan sterrekundiges die oppervlaktemperatuur en metaalinhoud aflei. As die afstand van die ster deur byvoorbeeld parallaksmeting bekend is, kan die ster se ligsterkte bereken word. Die massa, radius, oppervlakswaartekrag en rotasieperiode kan dan bepaal word gebaseer op stermodelle. Ook die ouderdom van die ster kan bereken word. Die ligsterkte word bepaal deur die ster se radius en oppervlaktemperatuur. Sommige sterre straal egter nie . Die vinnig draaiende ster Vega het byvoorbeeld . Die heel helderste sterre het . Absolute magnitude (M) hou nader verband met die ster se werklike ligsterkte en stem ooreen met hoe die ster sou gelyk het op . Die helderste ster van die Aarde af, Sirius, het byvoorbeeld . Die tweede helderste ster van die Aarde af, Canopus, het . Die swerm se dofste rooidwergsterre het . Dit strek van Klas O, wat baie warm is, tot Klas M, wat koel is. Die hoofklasse in volgorde van afnemende temperatuur is: O, B, A, F, G, K en M. Die algemeenstes hiervan is Klas L en Klas T vir bruindwerge. Elke letter het 1. Helpmij. nl gebruikt cookies op haar website om het gebruik van de website te analyseren, gebruiksgemak te verbeteren, voor social media en om ervoor te zorgen dat u relevante advertenties en informatie te zien krijgt wanneer u gebruik maakt van onze website. Meer informatie over de cookies kunt u vinden in ons privacy- en cookiestatement. U geeft door hieronder op de knop . Je kunt alleen tekst knippen uit. 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