Tianhui- e 'ngoe ea baetsi le barekisi ba li-chip tsa UV LED ba etellang pele ho fana ka ts'ebeletso ea chip ea LED ea ODM/OEM UV ka lilemo tse fetang 22+.
Rea u amohela bokamosong ba theknoloji ea mabone! Sengoliloeng sa rona sa morao-rao, re hlahloba matla a phetoho a li-chips tsa UV LED le bokhoni ba tsona ba ho fetola tsela eo re bonesang tikoloho ea rona ka eona. Ha lefats'e le ntse le tsoela pele ho amohela litharollo tse tšoarellang le tse baballang matla, li-chips tsa UV tsa LED li ntse li hlaha e le phetoho ea papali indastering ea mabone. Eba le rona ha re ntse re hlahloba tsoelopele e makatsang le menyetla eo li-chips tsa UV LED li fanang ka tsona, 'me u ithute hore na li betla tsela ea bokamoso bo khanyang, bo tsitsitseng haholoanyane.
Ha lefats'e la mabone le ntse le tsoela pele ho fetoha, li-chips tsa UV tsa LED li hlahile e le theknoloji ea phetoho, e fanang ka mefuta e mengata ea melemo le lits'ebetso. Sehloohong sena, re tla fana ka kenyelletso e tebileng ea li-chips tsa UV LED, ho hlahloba hore na ke eng le hore na li sebetsa joang, le bokhoni boo ba nang le bona ba ho fetola indasteri ea mabone.
Ha re le Tianhui, re bile ka pele ho nts'etsopele le ho hlahisa li-chips tsa UV LED, 'me re thabetse ho arolelana matla le bokhoni ba theknoloji ena.
Li-chips tsa UV LED ke lisebelisoa tsa semiconductor tse hlahisang leseli la ultraviolet (UV) ha motlakase o feta ho tsona. Ho fapana le mabone a tloaelehileng a UV, a sebelisang mouoane oa mercury ho hlahisa leseli la UV, li-chips tsa UV ke lisebelisoa tsa boemo bo tiileng, tse li etsang hore li boloke matla le ho baballa tikoloho. Lebaka ke hobane ha li na lisebelisoa tse kotsi joalo ka mercury, 'me li sebelisa matla a fokolang ha li ntse li fana ka nako e telele ea bophelo.
E 'ngoe ea likarolo tsa bohlokoa tsa li-chips tsa UV LED ke bokhoni ba tsona ba ho hlahisa leseli ka har'a mahlaseli a ultraviolet, a sa bonahaleng mahlong a motho. Sena se etsa hore li tšoanelehe bakeng sa lits'ebetso tse fapaneng, ho kenyeletsoa sterilization, tlhoekiso ea metsi, le tlhahlobo ea fluorescence. Lilemong tsa morao tjena, li-chips tsa UV LED le tsona li fumane ts'ebetso lefapheng la pheko ea UV, moo li sebelisetsoang ho phekola liphahlo, li-inks le likhomaretsi liindastering tse fapaneng.
Molao-motheo o sebetsang oa li-chips tsa UV LED o ipapisitse le motsamao oa lielektrone ka har'a thepa ea semiconductor. Ha motlakase o sebelisoa ho chip, li-electrone li matlafatsoa 'me li tloha sebakeng se fosahetseng (N) ho ea sebakeng se setle (P), moo li kopanang hape le masoba a electron le ho lokolla matla ka mokhoa oa photons. Matla a li-photon a lekanya bolelele ba maqhubu a khanya e hlahisoang, 'me tabeng ea li-chips tsa UV LED, bolelele bona bo oela ka har'a mahlaseli a ultraviolet.
Tianhui esale e etella pele ho nts'etsopele ea li-chips tsa UV LED, e sebelisa tsebo ea rona ea theknoloji ea semiconductor le mahlale a lintho tse bonahalang ho theha lihlahisoa tse sebetsang hantle le tse tšepahalang. Lits'oants'o tsa rona tsa UV tsa LED li etselitsoe ho fana ka khanya e nepahetseng le e tsitsitseng ea khanya ea UV, e li etsa hore e be tse loketseng bakeng sa lits'ebetso tse boima joalo ka kalafo ea indasteri le ho bolaea likokoana-hloko.
Ntle le litšoaneleho tsa bona tsa tekheniki, li-chips tsa UV LED li boetse li fana ka melemo e sebetsang ho feta mabone a setso a UV. Li kopane ebile li bobebe, li fana ka phetoho e kholo ho moralo le ho kopanya. Ba boetse ba na le bokhoni ba hang-hang, ba felisa tlhokahalo ea nako ea ho futhumatsa le ho ntlafatsa katleho ka kakaretso.
Ha tlhoko ea li-chips tsa UV e ntse e hola, Tianhui e ntse e ikemiselitse ho khanna boqapi le ho sutumelletsa meeli ea se ka khonehang ka theknoloji ena. Re ntse re tsoela pele ho batlisisa lisebelisoa tse ncha, lits'ebetso le lits'ebetso ho ntlafatsa ts'ebetso le ho feto-fetoha ha li-chips tsa rona tsa UV LED, le ho fihlela litlhoko tse tsoelang pele tsa indasteri ea mabone.
Qetellong, li-chips tsa UV LED li emela tsoelo-pele e kholo theknolojing ea mabone, tse fanang ka tharollo e baballang matla, e baballang tikoloho le e fapaneng bakeng sa lits'ebetso tse fapaneng. Tianhui e motlotlo ho ba ka pele ho phetohelo ena, 'me re thabile ho bona phetoho eo li-chips tsa UV LED li tla ba le eona bokamosong ba mabone.
Lilemong tsa morao tjena, li-chips tsa UV LED li ntse li etsa maqhubu indastering ea mabone, li fana ka melemo e mengata ho feta mahlale a mabone a setso. Joaloka moetapele lebaleng, Tianhui e bile ka pele ho phetohelo ena, a sebelisa matla a li-chips tsa UV LED ho theha litharollo tse ncha tsa mabone tse fetolang tsela eo re bonesang lefatše la rona ka eona.
O mong oa melemo ea bohlokoa ka ho fetisisa ea li-chips tsa UV LED ho feta mahlale a mabone a setso ke matla a tsona a matla. Li-chips tsa UV tsa LED li hloka matla a fokolang haholo ho hlahisa khanya e lekanang le ea mehloli ea mabone a setso, joalo ka mabone a incandescent kapa fluorescent. Sena ha se fetole feela ho theola likoloto tsa motlakase bakeng sa bareki le likhoebo empa hape se fokotsa tlhoko e akaretsang ea matla, ho etsa hore li-chips tsa UV LED e be khetho e tšoarellang haholoanyane bakeng sa mabone.
Ntle le ts'ebetso ea bona ea matla, li-chips tsa UV LED le tsona li fana ka nako e telele ea bophelo ha li bapisoa le mahlale a mabone a setso. Le ha mabone a incandescent le a fluorescent a ka hloka ho nkeloa sebaka ka lihora tse ling le tse ling tse likete tse 'maloa, li-chips tsa UV li ka nka lihora tse fetang 50,000, ho bolelang hore litšenyehelo tse tlase tsa tlhokomelo le tse ling bakeng sa bareki le likhoebo. Nako ena e ntseng e eketseha ea bophelo e boetse e kenya letsoho phokotsong ea litšila, kaha mehloli e fokolang ea mabone e hloka ho lahloa le ho nkeloa sebaka ka nako.
Ho feta moo, li-chips tsa UV LED li tsebahala ka ho tšoarella ha tsona le ho hana ho ts'oha le ho thothomela, ho li etsa tharollo e nepahetseng ea mabone bakeng sa lits'ebetso tse fapaneng, ho kenyeletsoa mabone a kantle, mabone a likoloi le mabone a indasteri. Bokhoni ba bona ba ho mamella maemo a thata a tikoloho bo ba etsa khetho e tšepahalang bakeng sa bareki le likhoebo tse batlang litharollo tsa mabone tsa nako e telele le tsa tlhokomelo e tlase.
Monyetla o mong oa li-chips tsa UV tsa LED ke boholo ba tsona bo kopaneng le ho tenyetseha ha moralo. Ho fapana le mehloli ea mabone ea setso e ka hlokang lisebelisoa tse kholo le tse matla, li-chips tsa UV tsa LED li ka kopanngoa le meralo e metle le ea sejoale-joale, e lumellang hore ho be le tharollo ea mabone a mangata le a fapaneng. Ho tenyetseha hona ha moralo ho bula menyetla ea lefats'e bakeng sa litsebi tsa meralo ea meralo, baqapi le litsebi tsa mabone, e ba nolofalletsang ho theha lits'ebetso tsa mabone tse ikhethang tse ntlafatsang boipiletso ba sebaka sefe kapa sefe.
Tianhui, e le mofani ea ka sehloohong oa li-chips tsa UV LED, o utloisisa bokhoni ba theknoloji ena ea phetoho 'me o ntse a sebelisa melemo ea eona ho hlahisa tharollo ea mabone a morao-rao bakeng sa mefuta e mengata ea lisebelisoa. Ho tloha ho mabone a bolulo le a khoebo ho isa lits'ebetsong tse ikhethileng tse kang sterilization le pholiso ea UV, li-chips tsa Tianhui tsa UV LED li matlafatsa moloko o latelang oa mabone a mabone.
Qetellong, melemo ea li-chips tsa UV LED ho feta mahlale a mabone a setso a hlakile. Ho tloha ho matla a bona a matla le nako e telele ea bophelo ho isa ho ts'ebetso ea bona e tšoarellang le ho tenyetseha ha moralo, li-chips tsa UV LED li fetola tsela eo re bonesang lefatše la rona ka eona. Joaloka pula-maliboho lefapheng lena, Tianhui e ikemiselitse ho sebelisa matla a li-chips tsa UV LED ho theha mekhoa e mecha, e tsitsitseng, le e ka tšeptjoang ea mabone e khotsofatsang litlhoko tse tsoelang pele tsa bareki le likhoebo ka ho tšoana.
Lefatšeng lena le lulang le fetoha, bokamoso ba mabone boa khanya, 'me bo ntse bo bōptjoa ke matla a li-chips tsa UV LED. Eba le Tianhui ho amoheleng theknoloji ena ea phetoho 'me u utloe phello ea phetoho ea mabone a UV LED.
Lilemong tsa morao tjena, li-chips tsa UV LED li ntse li hapa tlhokomelo e kholo le ho ts'oara liindasteri tse fapaneng bakeng sa bokhoni ba tsona ba ho fetola mabone. Joaloka moetsi ea ka sehloohong le mofani oa thepa ea li-chips tsa UV, Tianhui e 'nile ea e-ba ka pele ho tsoelo-pele ena ea theknoloji, ho hlahisa le ho fana ka litharollo tse ncha tsa UV LED chip ho finyella litlhoko tse fapaneng tsa liindasteri tse fapaneng.
E 'ngoe ea lits'ebetso tsa mantlha tsa li-chips tsa UV LED ke indastering ea tlhokomelo ea bophelo bo botle le ea bongaka. Lits'oants'o tsa UV tsa LED li sebelisitsoe haholo bakeng sa ts'ebetso ea ho thibela likokoana-hloko le ho bolaea likokoana-hloko lipetlele, lilaboratori le litsing tse ling tsa bophelo bo botle. Sehlahisoa sa UV-C se hlahisoang ke li-chips tsena se sebetsa hantle ho bolaeng libaktheria, livaerase le likokoana-hloko tse ling, se fana ka tharollo e tšepahalang le e sebetsang hantle bakeng sa ho boloka tikoloho e hloekile ebile e se na likokoana-hloko. Li-chips tsa Tianhui tsa UV LED li etselitsoe ka ho khetheha ho fana ka leseli le phahameng la UV-C, ho netefatsa hore ho na le likokoana-hloko le ho thibela likokoana-hloko maemong a tlhokomelo ea bophelo.
Ntle le moo, li-chips tsa UV LED li boetse li fumane lits'ebetso tse pharalletseng indastering ea tlhoekiso ea metsi le moea. Ka ho sebelisa mahlaseli a matla a UV-C, li-chips tsa Tianhui tsa UV LED li ka bolaea metsi le moea ka nepo, tsa tlosa litšila tse kotsi le ho ntlafatsa boleng ka kakaretso. Theknoloji ena e thusitse haholo ho rarolla mathata a tšilafalo ea metsi le moea, ho fana ka tharollo e tsitsitseng le e theko e tlaase bakeng sa ho hloekisa mehloli ea bohlokoa.
Ntle le ts'ebeliso ea bophelo bo botle le tikoloho, li-chips tsa UV li ipakile e le thepa ea bohlokoa indastering ea lijo le lino. Li-chips tsa UV tsa LED li sebelisetsoa ho boloka lijo le ho paka, ho lelefatsa bophelo ba shelofo ea thepa e senyehang ntle le tlhoko ea li-additives kapa li-preservatives. Li-chips tsa Tianhui tsa UV LED li etselitsoe ho fana ka tlhahiso e nepahetseng le e tsitsitseng ea UV-C, ho netefatsa polokeho ea lijo le boleng bo nepahetseng nakong eohle ea tlhahiso le kabo.
Ho feta moo, li-chips tsa UV tsa LED li kentse letsoho haholo indastering ea lisebelisoa tsa elektroniki le tsa semiconductor. Li-chips tsena li sebelisoa bakeng sa lits'ebetso tsa pholiso ea UV, ho thusa ho folisa ka potlako le ka nepo ha likhomaretsi, liphahlo le li-inks ha ho etsoa elektroniki. Li-chips tsa Tianhui tsa UV LED li fana ka ts'ebetso e ke keng ea lekanngoa le ho tšepahala, ho nolofalletsa bahlahisi ho finyella tlhahiso e phahameng le boleng bo phahameng mekhoeng ea bona ea tlhahiso.
Ka ntle ho liindasteri tsena, li-chips tsa UV LED le tsona li fumane lits'ebetso makaleng a khatiso, a likoloi le a sefofane, tse bonts'ang ho feto-fetoha ha tsona le bokhoni ba ho khanna boqapi mafapheng a fapaneng. Ha tlhoko ea theknoloji ea chip ea UV e ntse e hola, Tianhui e ntse e ikemiselitse ho nts'etsapele nts'etsopele le phepelo ea litharollo tsa mabone a mahlaseli a UV, ho matlafatsa liindasteri ka tharollo ea mabone e tsitsitseng, e sebetsang hantle le e sebetsang hantle.
Qetellong, ts'ebeliso ea li-chips tsa UV LED liindastering tse fapaneng li kholo ebile li na le tšusumetso, li fetola mekhoa ea mabone a setso le ho beha litekanyetso tse ncha tsa ts'ebetso, ts'ebetso le ts'ebetso. Ka boitseanape ba Tianhui le boinehelo ba tsoelo-pele ea theknoloji, monyetla oa li-chips tsa UV tsa LED ho tsamaisa phetoho e ntle ho liindasteri ha o na moeli.
Lilemong tsa morao tjena, tsoelo-pele e potlakileng ea theknoloji e lebisitse ho nts'etsopele ea lisebelisoa tsa UV LED, tse nang le monyetla oa ho fetola indasteri ea mabone. Li-chips tsena li na le bokhoni ba ho ntša lebone la ultraviolet (UV), 'me li mothating oa ho fetoha papali mabapi le ho baballa tikoloho le matla.
Li-chips tsa UV tsa LED li na le mefuta e mengata ea lits'ebetso tse ka bang teng, ho tloha ho likhomaretsi le likhoele ho isa ho sebolaea metsi le moea. Nakong e fetileng, mabone a tloaelehileng a UV a ne a sebelisetsoa merero ena, empa hangata a ne a tla le litšitiso tse kholo. Mabone ana a ne a le maholo, a phela nako e khutšoanyane, 'me a ja matla a mangata. Leha ho le joalo, ho tla ha li-chips tsa UV LED ho rarollotse litaba tsena, ho fana ka tharollo e sebetsang hantle le e tšoarellang.
E 'ngoe ea melemo ea bohlokoa ea li-chips tsa UV ke matla a tsona a matla. Li-chips tsena li hloka matla a fokolang haholo ho sebetsa ho feta mabone a tloaelehileng a UV, a bakang tšebeliso e tlase ea motlakase le ho fokotsa tlhahiso ea khabone. Sena se etsa hore li-chips tsa UV LED e be khetho ea ho bonesa tikoloho, e ikamahanyang le ts'ebetso ea lefats'e bakeng sa mekhoa e tsitsitseng le paballo ea matla.
Ho feta moo, li-chips tsa UV LED li na le nako e telele ea bophelo ha li bapisoa le mabone a setso a UV, ho bolelang hore a hloka ho nkeloa sebaka khafetsa. Sena ha se fokotse feela litšenyehelo tsa tlhokomelo empa hape se fokotsa bongata ba litšila tsa elektronike tse hlahisoang, e leng se tlatsetsang ho boloka tikoloho.
Ka lebaka la melemo ena, li-chips tsa UV LED li na le monyetla oa ho ama liindasteri tse fapaneng haholo. Mohlala, lefapheng la bongaka, li-chips tsa UV tsa LED li ka sebelisoa molemong oa ho koala, ho netefatsa bohloeki ba lisebelisoa tsa bongaka le lits'ebeletso. Lefapheng la tlhahiso, li-chips tsena li ka thusa ho folisa likhomaretsi le likhoele, ho ntlafatsa ts'ebetso ea ts'ebetso le boleng ba sehlahisoa.
Tianhui, moqapi ea etelletseng pele indastering ea mabone, o bile ka pele ho nts'etsopele ea chip ea UV LED. Ka boitlamo ba tsoelo-pele le tsoelo-pele ea theknoloji, Tianhui e ntse e sebelisa bokhoni ba li-chips tsa UV LED ho etsa tharollo ea mabone a morao-rao. Ka ho sebelisa matla a li-chips tsa UV LED, Tianhui e khonne ho fana ka lihlahisoa tse sa faneng feela ka ts'ebetso e phahameng empa hape li kenya letsoho ho bolokeng tikoloho le matla.
Ho Tianhui, re hlokomela bohlokoa ba li-chips tsa UV LED ho bopa bokamoso ba mabone. Boinehelo ba rona ba ho etsa lipatlisiso le nts'etsopele bo re lumelletse ho kopanya li-chips tsena lihlahisoa tsa rona, ho re nolofalletsa ho fa bareki ba rona tharollo ea mabone e sebetsang hantle, e se nang tikoloho. Re lumela hore kamohelo e atileng ea li-chips tsa UV LED e ke ke ea tsamaisa tsoelopele indastering ea mabone feela empa hape e tla kenya letsoho bokamosong bo tsitsitseng le bo botle ba tikoloho.
Qetellong, ho hlaha ha li-chips tsa UV LED ho emela mohato oa bohlokoa tsoelo-peleng ea theknoloji ea mabone. Ka matla a tsona a matla le monyetla oa ho baballa tikoloho, li-chips tsena li na le bokhoni ba ho fetola liindasteri tse fapaneng. Joaloka moetapele indastering ea mabone, Tianhui o ikemiselitse ho sebelisa matla a li-chips tsa UV ho theha tharollo ea mabone a macha le a tsitsitseng, 'me re thabile ho bona phello e ntle eo lichifi tsena li tla ba le eona bokamosong ba mabone.
Ha theknoloji e ntse e tsoela pele ka lebelo le potlakileng, indasteri ea mabone e bone phetoho e kholo ka ho hlahisoa ha li-chips tsa UV LED. Li-chips tsena li butse lefatše la menyetla ea lisebelisoa tsa mabone, tse fanang ka ts'ebetso e ntlafalitsoeng le ts'ebetso ha li bapisoa le mehloli ea mabone a setso. Sehloohong sena, re tla hlahloba lintlha tsa ho kenya ts'ebetsong li-chips tsa UV LED lits'ebetsong tsa mabone le phello e ka bang teng indastering.
Ha ho tluoa tabeng ea ho kenya ts'ebetsong li-chips tsa UV LED lits'ebetsong tsa mabone, ho na le lintlha tse 'maloa tsa bohlokoa tse lokelang ho tsotelloa. Pele ho tsohle, ho bohlokoa ho utloisisa theknoloji e ka morao ho li-chips tsa UV le hore na li fapana joang le mehloli ea mabone a setso. Lits'oants'o tsa UV tsa LED li hlahisa leseli la ultraviolet, le ka sebelisetsoang lits'ebetso tse fapaneng ho kenyelletsa ho phekola, ho thibela likokoana-hloko le ho bolaea likokoana-hloko. Sena se etsa hore e be khetho e fapaneng le e sebetsang bakeng sa lisebelisoa tsa mabone.
E 'ngoe ea lintlha tsa bohlokoa tsa ho kenya ts'ebetsong li-chips tsa UV LED lits'ebetsong tsa mabone ke mokhoa oa ho boloka litšenyehelo. Le ha matsete a pele ho li-chips tsa UV LED a ka ba holimo ho feta mehloli ea mabone a setso, poloko ea nako e telele e ka ba ea bohlokoa. Lits'oants'o tsa UV tsa LED li na le nako e telele ea bophelo le tšebeliso e tlase ea matla, e bakang litšenyehelo tse fokotsehileng tsa tlhokomelo le ts'ebetso. Sena se ka etsa hore e be khetho e theko e tlaase bakeng sa lits'ebetso tsa mabone tsa khoebo le tsa bolulo.
Ntle le ho boloka litšenyehelo, li-chips tsa UV LED li fana ka ts'ebetso e ntlafalitsoeng ha e bapisoa le mehloli ea mabone a setso. Li na le ts'ebetso e phahameng le tlhahiso, li fana ka kabo ea khanya e khanyang le e ts'oanang. Sena se ka fella ka ponahalo e betere le tlhahiso e ntlafalitsoeng maemong a fapaneng, ho kenyeletsoa libaka tsa indasteri, tsa mabenkele le tsa bolulo. Ho feta moo, li-chips tsa UV tsa LED li na le nako ea karabelo e potlakileng 'me li ka fifala habonolo, li fana ka taolo e kholo le ho fetoha habonolo lits'ebetsong tsa mabone.
Ntho e 'ngoe ea bohlokoa eo ho nahanoang ka eona bakeng sa ho kenya ts'ebetsong li-chips tsa UV LED lits'ebetsong tsa mabone ke phello ea tikoloho. Ka ho tsepamisitse maikutlo ho ts'ebetsong le ts'ebetsong ea matla, li-chips tsa UV tsa LED ke tharollo ea mabone a eco-friendly. Ha li na mercury kapa lisebelisoa tse ling tse kotsi, e leng se etsang hore e be khetho e sireletsehileng le e tsitsitseng haholoanyane bakeng sa lisebelisoa tsa mabone a kahare le kantle. Ho feta moo, tšebeliso ea bona e tlase ea matla e thusa ho fokotsa tlhahiso ea khabone le ho fokotsa sekhahla sa tikoloho.
Ha ho tluoa tabeng ea ho kenya ts'ebetsong li-chips tsa UV LED lits'ebetsong tsa mabone, ho bohlokoa ho sebetsa le moetsi ea ka tšeptjoang le ea nang le phihlelo. Tianhui ke mofani ea ka sehloohong oa li-chips tsa LED tsa UV, tse fanang ka lihlahisoa tse ngata tsa boleng bo phahameng tse etselitsoeng lisebelisoa tse fapaneng tsa mabone. Ka thekenoloji ea rona e tsoetseng pele le boitseanape tšimong, re ka thusa likhoebo le batho ka bomong ho fetohela lits'ebetsong tsa mabone tsa UV LED ka kholiseho.
Qetellong, ts'ebetsong ea li-chips tsa UV LED lits'ebetsong tsa mabone e fana ka melemo e mengata, ho tloha ho boloka litšenyehelo le ts'ebetso e ntlafetseng ho ea ts'ebetsong ea tikoloho. Ka ho utloisisa theknoloji e ka morao ho li-chips tsa UV le ho sebetsa le moetsi ea tsebahalang joalo ka Tianhui, likhoebo le batho ka bomong ba ka nka monyetla oa tharollo ena ea mabone 'me ba lule ba le ka pele ho indasteri.
Qetellong, nts'etsopele le ts'ebeliso ea li-chips tsa UV LED e hlile e fetotse indasteri ea mabone. Li-chips tsena tse tsoetseng pele ha lia ntlafatsa feela ts'ebetso ea matla le ho fokotsa khabone, empa li boetse li butse menyetla e mecha mafapheng a fapaneng joalo ka tlhokomelo ea bophelo bo botle, temo le indasteri. Ka boiphihlelo ba rona ba lilemo tse 20 indastering, re ikemiselitse ho tsoela pele ho fetoha le ho ntlafatsa molemong oa ho tlisa matla a li-chips tsa UV LED liindastering le lits'ebetsong tse ling. Bokamoso ba mabone bo khanya ka bokhoni bo makatsang ba theknoloji ea UV LED, 'me re thabetse ho ba ka pele ho phetoho ena.