Re: Help, help help!!! (fwd)

[Dam Son <son@fermi.phys.washington.edu>]

---------- Forwarded message ----------
Date: Sat, 15 Mar 1997 02:02:14 -0800
From: cuongnguyen <cuong.nguyen@rug.ac.be>
To: vks <viet-khsv@is.aist-nara.ac.jp>, Toan <toan@usa.net>
Subject: [Viet-Khsv: 4253] Re: Help, help help!!!

Chao ca nha,
Chao Anh Toan

Cuong xin chan thanh cam on Anh Ca, Anh VuNguyenTha`nh, Anh TLthanh, 
ba.n So+? va- Anh Toa-n (toan@usa.net) da giu'p cho Cuong nhung tin tuc 
co gia tri de Cuong chuan bi cho cai Presentation sap toi. Tuy vay Cuong 
van con co' mot so^' thac mac muon hoi them, phien cac Anh giu'p no^'t.

1. Anh Tha`nh co' no'i la- khi' gi- do' trong tu? la.nh thi do' la- khi' 
Freon. Nhung hi-nh nhu la co' hai loai freon thi- pha?i vi khi o VN ca'i 
tu? la.nh nha Cuong no' bi. do- gas va phai di nap lai. Khi den cua hang 
thi- nguoi ta hoi la thich loai gas na-o, freon 11 va freon 22 moi loai 
moi tie^-n. Vay thi- chu'ng kha'c nhau die^?m gi- va- loai na-o la-m 
thu?ng Ozone layer??? Co-n voi tu? la.nh thi cha'c la loai nao da(t hon 
thi tot hon :-))

2. Do+n vi. do a'nh sa'ng thuong la- Lux, va^.y thi co-n co' don vi. nao 
kha'c kho^ng??? Do+n vi. do UV co' pha?i la- Lux kho^ng??? Ca'c den UV 
thuong co' kha? nang pha't ra bao nhieu don vi.???

3. Trong Lab cua Cuong du-ng ra^'t nhieu UV lamp de^? khu+? tru-ng. Ve 
nguye^n ly' cua de-n thi- Cuong da hie^?u nho+- ba-i cua Anh Thanh va- 
cua So+?. Va^.y xin ho?i the^m the^' na-y: trong cataloge cu?a de-n ghi 
so^' gio+- su+? du.ng, thu+o+-ng khoa?ng 2000gio+-. Va^.y khi qua' so^' 
gio+- do' thi- no' kho^ng pha't ra UV nua hay sao??? ta.i sao va^.y???

4. UV (trong tu nhien) duoc tao ra tu mat troi nhung no khong den duoc 
trai dat la do bi Ozone layer hap thu. Vay thi- neu Ozone layer khong 
thung thi tai be mat trai dat co' UV hay khong? neu co' thi chiem bao 
nhieu % trong solar radiation reached to earth surface? Khi do thi ca^y 
co^'i ba(-ng ca'ch nao cho^'ng la.i duoc UV vi chlorophille trong la' 
cay la- mot pigment ra^'t de bi. pha^n hu?y.

5. UV co' kha? nang dam xuye^n the na-o? No' co' xuye^ng qua nuoc nhu la 
visible radiation kho^ng??? No' co' the^? xuye^n qua ki'nh ma-u 
kho^ng??? Cuong thay trong qua?ng ca'o mo^.t ki'nh deo ma('t la- ngan 
duoc UV B, vay thi- ki'nh loai nao ngan duoc ca? ba loai UV??? 

6. Cung trong qua?ng ca'o cua mot so^' loa.i skill creams thay ghi la- 
cho^'ng duoc UV, vay thi- ca'i cha^'t gi- trong do' la- quye^'t di.nh 
ti'nh cha^'t na-y???

Va-i cau ho?i nho?, ra^'t mong cac Anh cac Chi bo+'t chu't tho+-i gian 
giu'p Cuong vo+'i.

Xin chan thanh cam on.

Phu Cuong in Ghent