Ikhoyili yensimbi ye-PPGIiyi-substrate yensimbi ehlanganisiwe embozwe ngesendlalelo semikhiqizo yokumboza yemvelo, ngenxa yezakhiwo zayo ezinhle kakhulu zokulwa nokugqwala, ukumelana nesimo sezulu kanye nokubukeka okuhle, esetshenziswa kabanzi ekwakheni, ezintweni zasekhaya, ezimotweni nakwezinye izimboni. Umlando wama-rolls ahlanganiswe ngombala uqala ekuqaleni kwekhulu lama-20 futhi ekuqaleni wawuklanyelwe ukuxazulula inkinga yokugqwala kwamapuleti ensimbi ehlanganisiwe ezindaweni ezimanzi. Ngokuvuthwa kobuchwepheshe bokufaka i-galvanizing, insimbi ehlanganisiwe isetshenziswe kabanzi emakethe.
Ngawo-1960, umqondo we-imiqulu embozwe ngombalakwaqala ukuvela, futhi abakhiqizi basebenzisa ubuchwepheshe bokumboza ukuze bangeze umbala kanye nezendlalelo zokuvikela kumapuleti ensimbi agqitshiwe, okuhlangabezana nezidingo ezimbili zemakethe zobuhle nokuqina. Phakathi nalesi sikhathi, ukumboza okuyinhloko okusetshenzisiwe ikakhulukazi ukumboza okusekelwe kumafutha, yize kunezinzuzo ezithile ekusebenzeni, kodwa ukuvikelwa kwemvelo nokuphepha kusadingeka kuthuthukiswe.
Ngawo-1970 nawo-1980, ngokuthuthuka kobuchwepheshe be-resin yokwenziwa kanye nokwemboza, inqubo yokukhiqiza ye-PPGI yathuthukiswa njalo, ukunamathela, ukumelana nokugqwala kanye nokumelana nesimo sezulu kwengubo kwathuthukiswa kakhulu, futhi imibala ehlukahlukene kanye nokuthungwa kwengubo kwavela emakethe ukuze kuhlangatshezwane nezidingo zomuntu ngamunye zamakhasimende ahlukene. Phakathi nalesi sikhathi, i-PPGI yaqala ukusetshenziswa kabanzi kuukwakha uphahla nezindonga, iba yingxenye ebalulekile yezakhiwo zanamuhla.
Ngemva kokungena ekhulwini lama-21, ukukhuthazwa kokuqwashisa ngemvelo emhlabeni wonke kuye kwashukumisela imboni yopende ukuba ithuthuke ngendlela yokuvikela okuluhlaza kanye nemvelo. Abakhiqizi abaningi baqala ukusebenzisa izembozo ezisekelwe emanzini kanye nezembozo ezingaphili ukuze banciphise umthelela wazo emvelweni. Lolu shintsho alugcini nje ngokuthuthukisa ukuphepha kwe-PPGI, kodwa futhi luyenza incintisane kakhulu emakethe. Ngalesi sikhathi, insimu yokusetshenziswa kwe-PPGI yandiswa kakhulu ukuze ifake izimboni eziningi ezifana nemishini yasekhaya kanye nengaphakathi lezimoto, okubonisa ukuphakama kwayo ngokuhlukahluka kanye nokuzivumelanisa nezimo.
Njengoba isayensi nobuchwepheshe buqhubeka nokuthuthuka, amathuba entuthuko yesikhathi esizayo ye-PPGI abanzi. Ukwethulwa kwezinto ezintsha nobuchwepheshe kuzoqhubekisela phambili i-PPGI ekusebenzeni okuphezulu kanye nentuthuko enobungani nemvelo. Njengoba kugcizelelwa kakhulu ekwakheni okusimeme kanye nomklamo oluhlaza, i-PPGI kulindeleke ukuthi idlale indima enkulu kulezi zindawo.
Ngamafuphi,Imiqulu embozwe ngombala we-PPGIsezibe yinto ebalulekile embonini yanamuhla ngezakhiwo zazo ezinhle kakhulu zomzimba kanye nokubukeka okuhle. Ngokuthuthuka okuqhubekayo kobuchwepheshe kanye nezinguquko ekufuneni kwemakethe, ukusetshenziswa kwe-PPGI kuzoqhubeka nokukhula, kulethe amathuba amaningi kuzo zonke izigaba zokuphila.
IQEMBU LASEBUKHOSINI
Ikheli
Indawo yezimboni zokuthuthukiswa kweKangsheng,
Isifunda saseWuqing, idolobha laseTianjin, eChina.
I-imeyili
Amahora
UMsombuluko-NgeSonto: Isevisi yamahora angu-24
Isikhathi sokuthunyelwe: Okthoba-12-2024