Showing posts with label Sains. Show all posts
Showing posts with label Sains. Show all posts

Wednesday, 20 April 2016

Selalu Nampak 'Ulat' Ni Terbang Di Mata Anda? Jom Baca Penjelasan Kejadian Ini


Sudah pasti ramai antara kita selalu melihat objek berbentuk cacing atau ulat "tranparent" seperti ini yang terapung-apung di mata kita terutama apabila melihat kearah langit, adakala ia hilang dan adakala muncul bermain-main di mata kita, apakah sebenarnya objek ini?

Untuk pengetahuan anda, ia adalah  ‘muscae volitantes’ atau 'flying flies' dan ianya bukanlah kerana terdapat ulat atau objek pelik di dalam mata kita atau semata-mata khayalan.

Sebenarnya ia terhasil dari cebisan-cebisan tisu, rumpun-rumpun protein atau sel-sel darah merah dalam mata kita yang bergerak.


Maka terhasillah paparan-paparan seperti 'ulat terbang' yang kita lihat hasil bayang-bayang cebisan-cebisan tisu, rumpun-rumpun protein atau sel-sel darah merah yang bergerak itu.

Jika anda ini melihat dengan lebih jelas 'ulat terbang' ini, tutup mata anda dengan kedua-dua belah tangan, lalu buka mata ditempat terang seperti lihat ke langit.

Semakin terang cahaya yang masuk ke mata semakin kecil pupil dan semakin dekat banyak "ulat-ulat" itu terhasil di retina.

Monday, 18 April 2016

'Strong' El Nino to cause low rainfall in Malaysia

Malaysia’s rainfall intensity is expected to reduce by 20 to 60 percent starting this month, following the El Nino phenomenon currently sweeping the country.

Meteorological Department director-general Che Gayah Ismail said the current El Nino level was categorised as ‘strong’ and the country’s temperature is expected to rise between 0.5 to two degrees Celsius.

She said the strong impact of El Nino would continue until April with the northern states in the peninsula starting to feel its effects.
“El Nino’s strong impact will be felt by all the states in the peninsula, Sabah as well as in the Miri and Limbang divisions in Sarawak by the end of this month.
“If we look at the records, the country’s maximum temperature when hit by El Nino in 1998 had reached 40.1 degrees Celsius,” she said.
“Therefore we do not rule out the possibility that the same situation will be repeated,” she added.
El Nino is a warming of the sea surface temperatures which occurs six months in a row every two to four years in the eastern Pacific Ocean.
It can cause a chain of climate change worldwide, among them heavy rainfall in some areas and prolonged drought in others.
The United Nations (UN) released a statement in December last year stating that the El Nino phenomenon was sweeping across the world and that the phenomenon which began with mild and localised conditions in the Pacific in late 2014, had now intensified to cover large portions of Asia and the Pacific.
El Nino is likely to have profound effects on central and southern India, central and north-east Thailand, the central and southern Philippines, northern Cambodia, eastern Indonesia, Papua New Guinea and many Pacific island nations.
In the meantime, Che Gayah said the intensity of El Nino was expected to reach its peak this month, and gradually weaken from February, and the situation is expected to become neutral after June this year.