\u0110\u01b0\u1eddng c\u1ea7u v\u01b0\u1ee3t l\u00e0 m\u1ed9t trong nh\u1eefng ti\u00eau ch\u00ed giao th\u00f4ng c\u1ee7a th\u00e0nh ph\u1ed1 hi\u1ec7n \u0111\u1ea1i. Khi l\u00e1i xe tr\u00ean \u0111\u01b0\u1eddng c\u1ea7u v\u01b0\u1ee3t, n\u1ebfu ch\u00fa \u00fd b\u1ea1n s\u1ebd nh\u00ecn th\u1ea5y nhi\u1ec1u ch\u1ed7 hai b\u00ean \u0111\u01b0\u1eddng ng\u01b0\u1eddi ta d\u1ef1ng nh\u1eefng t\u1ea5m ch\u1eafn trong su\u1ed1t ho\u1eb7c b\u1eb1ng nh\u1eefng t\u1ea5m nh\u1ef1a m\u00e0u \u0111\u1ee5c. Nh\u1eefng t\u1ea5m ch\u1eafn n\u00e0y c\u00f3 t\u00e1c d\u1ee5ng g\u00ec? Nguy\u00ean l\u00e0 ch\u00fang d\u00f9ng \u0111\u1ec3 gi\u1ea3m th\u1ea5p ti\u1ebfng \u1ed3n giao th\u00f4ng.<\/p>\n\n\n\n
V\u00ec th\u00e0nh ph\u1ed1 kh\u00f4ng gian ch\u1eadt h\u1eb9p, \u0111\u01b0\u1eddng c\u1ea7u v\u01b0\u1ee3t c\u00f3 l\u00fac \u0111i qua g\u1ea7n khu d\u00e2n c\u01b0 ho\u1eb7c nh\u00e0 l\u00e0m vi\u1ec7c cao t\u1ea7ng n\u00ean b\u1eaft bu\u1ed9c ph\u1ea3i d\u1ef1ng nh\u1eefng t\u1ea5m ch\u1eafn \u0111\u1ec3 ng\u0103n c\u1ea3n \u1ea3nh h\u01b0\u1edfng ti\u1ebfng \u1ed3n giao th\u00f4ng. M\u1eb7c d\u00f9 m\u1eb7t \u0111\u01b0\u1eddng c\u1ea7u v\u01b0\u1ee3t b\u1eb1ng ph\u1eb3ng, ti\u1ebfng c\u00f2i \u00f4 t\u00f4 nh\u1ecf, nh\u01b0ng v\u00ec l\u01b0\u1ee3ng \u00f4 t\u00f4 nhi\u1ec1u cho n\u00ean ti\u1ebfng \u1ed3n c\u1ee7a \u0111\u1ed9ng c\u01a1 r\u1ea5t l\u1edbn. L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111\u1ed1i ph\u00f3 ti\u1ebfng \u1ed3n giao th\u00f4ng tr\u00ean \u0111\u01b0\u1eddng c\u1ea7u v\u01b0\u1ee3t n\u00e0y? Ng\u01b0\u1eddi ta \u0111\u00e3 \u0111\u1eb7t nh\u1eefng t\u1ea5m ch\u1eafn, \u0111\u00f3 l\u00e0 bi\u1ec7n ph\u00e1p r\u1ea5t t\u1ed1t. T\u01b0\u1eddng ch\u1eafn ti\u1ebfng \u1ed3n ph\u1ea3i \u0111\u1eb7t \u1edf gi\u1eefa ngu\u1ed3n g\u00e2y ti\u1ebfng \u1ed3n v\u00e0 n\u01a1i ti\u1ebfp thu ti\u1ebfng \u1ed3n nh\u1eb1m ng\u0103n c\u1ea3n ti\u1ebfng \u1ed3n truy\u1ec1n t\u1edbi. Nh\u1eefng t\u01b0\u1eddng ch\u1eafn l\u1edbn th\u01b0\u1eddng d\u00f9ng \u0111\u1ec3 gi\u1ea3m th\u1ea5p ti\u1ebfng \u1ed3n giao th\u00f4ng tr\u00ean \u0111\u01b0\u1eddng cao t\u1ed1c ho\u1eb7c s\u1ef1 nhi\u1ec5u lo\u1ea1n \u1edf nh\u1eefng v\u00f9ng g\u1ea7n s\u00e2n bay. N\u00f3i chung ng\u01b0\u1eddi ta th\u01b0\u1eddng d\u00f9ng nh\u1ef1a t\u1ea5m ho\u1eb7c th\u00e9p t\u1ea5m \u0111\u1ec3 t\u1ea1o th\u00e0nh nh\u1eefng b\u1ee9c t\u01b0\u1eddng hai t\u1ea7ng, \u1edf gi\u1eefa r\u1ed7ng, trong \u0111\u00f3 ch\u00e8n c\u00e1c v\u1eadt li\u1ec7u kh\u1eed \u00e2m thanh. \u1ede \u0111\u01b0\u1eddng c\u1ea7u v\u01b0\u1ee3t th\u01b0\u1eddng d\u1ef1ng c\u00e1c b\u1ee9c t\u01b0\u1eddng ch\u1eafn c\u1ea3 hai b\u00ean. T\u01b0\u1eddng m\u1ecfng, kh\u00f4ng chi\u1ebfm di\u1ec7n t\u00edch cao kho\u1ea3ng 2 m v\u00e0 h\u00ecnh v\u00f2ng cung. T\u01b0\u1eddng ch\u1eafn \u00e2m n\u00e0y th\u01b0\u1eddng c\u00f3 hi\u1ec7u qu\u1ea3 t\u01b0\u01a1ng \u0111\u1ed1i t\u1ed1t. Theo \u0111o \u0111\u1ea1c, l\u01b0\u1ee3ng c\u00e1ch \u00e2m b\u00ecnh qu\u00e2n c\u1ee7a n\u00f3 th\u01b0\u1eddng v\u01b0\u1ee3t qu\u00e1 30 dB, h\u1ec7 s\u1ed1 h\u00fat \u00e2m b\u00ecnh qu\u00e2n v\u01b0\u1ee3t qu\u00e1 0,6, n\u00f3i chung c\u00f3 th\u1ec3 gi\u1ea3m th\u1ea5p ti\u1ebfng \u1ed3n t\u1eeb 5 \u2013 15 dB. M\u1ee9c \u0111\u1ed9 gi\u1ea3m th\u1ea5p \u0111\u01b0\u1ee3c bao nhi\u00eau ph\u1ee5 thu\u1ed9c v\u00e0o vi\u1ec7c d\u00f9ng v\u1eadt li\u1ec7u g\u00ec v\u00e0 kh\u1ea3 n\u0103ng h\u00fat \u00e2m thanh c\u1ee7a ch\u00fang ra sao.<\/p>\n\n\n\n
N\u0103m 1993, c\u00e1c ng\u00e0nh c\u00f3 li\u00ean quan \u1edf Th\u01b0\u1ee3ng H\u1ea3i \u0111\u00e3 \u0111\u1ea7u t\u01b0 h\u01a1n 10 tri\u1ec7u \u0111\u1ed3ng \u0111\u1ec3 \u0111\u1eb7t 18 b\u1ee9c t\u01b0\u1eddng tr\u00ean c\u00e1c ch\u1ed7 g\u1eb7p nhau c\u1ee7a c\u1ea7u v\u01b0\u1ee3t \u0111\u01b0\u1eddng v\u00f2ng th\u00e0nh ph\u1ed1 v\u1edbi c\u1ea7u v\u01b0\u1ee3t tr\u1ee5c \u0111\u01b0\u1eddng giao th\u00f4ng b\u1eafc-nam, l\u00e0 nh\u1eefng n\u01a1i r\u1ea5t nh\u1ea1y c\u1ea3m v\u1edbi ti\u1ebfng \u1ed3n. T\u1ed5ng c\u1ed9ng chi\u1ec1u d\u00e0i c\u1ee7a c\u00e1c \u0111o\u1ea1n t\u01b0\u1eddng ch\u1eafn h\u1ee3p l\u1ea1i kho\u1ea3ng 8 km v\u00e0 \u0111\u00e3 \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u qu\u1ea3 gi\u1ea3m ti\u1ebfng \u1ed3n r\u00f5 r\u1ec7t. Th\u1ef1c t\u1ebf m\u00e0 n\u00f3i, \u0111\u1eb7t t\u1ea5m ch\u1eafn gi\u1ea3m ti\u1ebfng \u1ed3n l\u00e0 bi\u1ec7n ph\u00e1p c\u00f3 hi\u1ec7u qu\u1ea3 \u0111\u1ed1i v\u1edbi \u0111\u01b0\u1eddng c\u1ea7u v\u01b0\u1ee3t.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: Ti\u1ebfng \u1ed3n giao th\u00f4ng; T\u01b0\u1eddng ch\u1eafn ti\u1ebfng \u1ed3n.<\/p>\n","protected":false},"excerpt":{"rendered":"
\u0110\u01b0\u1eddng c\u1ea7u v\u01b0\u1ee3t l\u00e0 m\u1ed9t trong nh\u1eefng ti\u00eau ch\u00ed giao th\u00f4ng c\u1ee7a th\u00e0nh ph\u1ed1 hi\u1ec7n \u0111\u1ea1i. Khi l\u00e1i xe tr\u00ean \u0111\u01b0\u1eddng c\u1ea7u v\u01b0\u1ee3t, n\u1ebfu ch\u00fa \u00fd b\u1ea1n s\u1ebd nh\u00ecn th\u1ea5y nhi\u1ec1u ch\u1ed7 hai b\u00ean \u0111\u01b0\u1eddng ng\u01b0\u1eddi ta d\u1ef1ng nh\u1eefng t\u1ea5m ch\u1eafn trong su\u1ed1t ho\u1eb7c b\u1eb1ng nh\u1eefng t\u1ea5m nh\u1ef1a m\u00e0u \u0111\u1ee5c. Nh\u1eefng t\u1ea5m ch\u1eafn n\u00e0y c\u00f3 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[15,17],"tags":[],"class_list":["post-9462","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-moi-truong"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/9462","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=9462"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/9462\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=9462"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=9462"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=9462"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}