Nghiên cứu truyền siêu âm trong môi trường đất đá

HA
NOI
- 2007
DAI HOC
QUdc
GIA HA NOI
TRlJdNG
DAI HOC KHOA HOC
TU
NHIEN
^ ^
Jis
y
JjS
rf!
Sp
t"
»I"
NGHIEN
Ciru
TRUYEN SIEU AM TRONG MOI
TRUdNG
DAT DA.
( Research of transmission of
untra-sound
in ground and
stone
environments)
MA
SO:
QT-07-17.

CHU TRI
D^
TAI:
THS.GVC NGUYEN DANG LAM
CAC CAN BO THAM GIA: CN. PHAM VAN THANH
CN. VO LY THANH HA.
KS.
NGO QUY THEM
OAi
HOC QUOC GIA HA NOI
TRUNG TAM THONG TIN THU VIEN
PJJJIL
HA NOI - 2007
l.Bao
cao torn tat:
a. Ten de
tdi:
Nghien
ciJu
qua trinh truyen song sieu am trong moi
trixdng
dat da.
Ma sd'de
tai: QT-07-17.
b. Chu tri de
tdi:
Ths.
GVC
Nguyin Dang Lam.
c. Cdn bg tham gia:

l.CN.
Pham
Van Thanh.
2.
CN. Vo Ly Thanh Ha.
3.
KS.
Ngd
Quy Them.
d. Muc tieu vd noi dung nghien
cuti:
- Muc tieu: Nghien
cihi
qua
trinh
truyen song am trong cac moi trucmg tho nhu dat, cat, be
tong
v.v Danh
gia kha nang thu phat song sieu am trong cac moi trudng nay.
- Noi dung nghien
cihi:
+ Che tao may phat sieu am tan sd 40kHz - 500kHz .
+
Che'
tao cac
m§u
do.
+ Khao sat
toe
do truyen song sieu am trong cac moi

trucfng
tho.
+ Danh gia kha nang
diing
song sieu am tham do long dat.
e. Cdc ket qud dat duac:
1.
Thiet ke
Idp
rap thanh cong may phat sieu am tan so 40kHz den 500kHz.
2.
Khao sat duac quy luat bien doi van
toe
truyen song trong cac moi
tru5ng
tho
va danh gia kha nang co the diing song sieu am tham do long dat
a
do sau duai
Im.
3.
Co mpt bao cao khoa hoc tai hoi nghi khoa hoc truang Dai hoc Su pham Ha
Noi 2 thang
11
nam 2007.
4.
De tai giup thuc hien 2 khoa luan sinh vien.
/. Tinh hinh kinh
phi
de tdi:

Kinh phi da sii dung 20.000.000 d ( Hai muai trieu dong
chSn
).
Xac nhan cua BCN Khoa
PGS.TS Nguyen The Binh
Xac nhan cua truang
OMO Hl£u
THUONG
t
/
PQS.lS.SjjiL^u^&iuni
2.
Summary (by English)
a. Project, code
Research of transmission of untra-sound in ground and stone environments
Code : QT-07-17
b.
Main responsible person
MS.
Nguyen Dang Lam, Faculty of Physics,
Hanoi University of Science (HUS), Hanoi National University
c.
Incorporated members
BA. Pham Van Thanh
BA. Vo Ly Thanh Ha
ED.
Ngo Quy Them
d. Purposes and contents
- Purposes: Research of transmission of untra-sound in some crude environments
as ground, sand, concrete, etc

- Contents:
+ Create generator 40kHz-500kHz
+ create samples
+ research velocity untra-sound in crude environments
+ evaluate ablity of using of untrasound to explore in earth's womb
e. Results
1.
design and assemble generator from 40kHz to 500kHz.
2.
research the laws of changing of velocity in some crude environments and evaluate
ablity of using of untrasound to explore
Im
under ground .
3.
01 report of Science Conference of Hanoi Pedagogical University
N*^2
11/2007.
4.
02 thesises of undergraduated students.
Muc luc
Un mo diu
5
Chuang 1: Khao sat kha nang truyen song sieu am trong dat da 6
1.1 Che tao miu do 6
1.2
H^
thi^
bi do 9
1.3 Ket qua va thao luan
11

Chuang 2: Che tao may phat sieu
am
14
2.1
So
do mach dien 14
2.2
Ketqua
va thao luan
18
Ketkuan
20
Tai lieu tham khao 21
Phu
luc 22
Lcil
ma dau.
The ky 20 nhan loai da
chu:ng
kien su phat
tri^n
manh me ciia khoa hoc va ky thuat.
Trong do
am
- situ
km cOng
la mot trong nhirng nganh khoa hoc co
nhiJng
budrc tien
vucft

bac va da tham
nh|p
ngay cang nhieu vao cac
linh
vuc khoa hoc, c6ng nong nghiep, y te,
giao
thong, f
Viec tham do khao sat long dat nham phat hien
nhiing
di vat khao co hay
nhung
di^m
khong dam bao chat luang tren de dieu nhu
td
moi, cac diem dat
r6ng,khao
sat tinh dong deu trong ket ca'u
b6
tong xay dung, ma khong
c5n
dao hay pha hiiy la mot
giai phap tiet kiem rat
Idn
cho kinh phi thi cong cong trinh, trong qua trinh dao dap de
dieu,v.v Do
do, viec nghien cuu cac quy luat truyen song sieu
am
trong cac moi truang
tho nhu da't, da la het
su'c

quan trong, dat tien de cho viec che tao nhung thiet bi co kha
nang ap dung trong thuc te.
De tai nay nham khang dinh kha nang truyen song sieu am trong moi truang tho
nhu dat, da, be
tong, Tir
do dua ra nhung hudng phat trien tiep theo de co the ap dung
duac trong thuc te.
Chuang 1: Khao sat kha nang truyen song sieu am
trong dat da.
1.1 Che tao
mSu
do.
Mau do duoc che tao bao gom:
(1).
3
mau
do lam bang dat hinh lap phuang:
5 cm
5 cm
5 cm
Hinh
1.1:
Kich thucfc
3
miu
dat
hinh
lap phuang
Ty le pha duac cho nhu bang:
Ky hieu

1.1
1.2
1.3
Ten
mau
MIu
1
Mau
2
Mau 3
Dat phu xa
2
2
4
Dat thjt
2
2
4
Dat cat
2
4
2
(2).
2 mSu be tong hinh lap phuang
10 cm
0 cm
Hinh
1.2:
Kich lhu6c cua miu be tong
hinh

lap phuang
- Miu ba tong mac 300, ky hieu 2.1,
ti
le: nu6c/xi mang = 0.44
+ Xi mang: 4
+ Da: 1
+ Cat: 5
- Miu
be
t6ng mac 300 + phu gia deo (Sika), ky hieu 2.2:
nu6c/xi mang=0.361
(3).
1 miu da xanh hinh tru: ky hieu 3.1
0=74.5 mm
h=200
mm
Hinh
1.3:
Kich thu6c
ciia
miu da
(4).
Miu gach nung, ky hieu 4.1
215
mm
90 mm
50 mm
Hinh
1.4:
Kich

thudc ciia miu gach nung
(5).
Miu
be
tong
hinh
hop chu nhat, ky hieu 5.1
200 mm
200 mm
00 mm
Hinh
1.5:
Kich
thuac cua miu gach be tong
(6).
Miu do ket hap:
CHt
DM
Gfic.h
xay
8R
tong
L=65 cm
37 cm
7 cm
37 cm
37 cm
Hinh
1.6: Miu do ket hgfp
1.2 He

thiet
bi do.
1.2.1. Thiet
bi
C386
Day
la
thiet
bj
sieu
am
diing
de do van
toe truyen
sieu
am. Vdi miu do cd
chieu
dai
1,
thdi gian truyen
t thi van
toe
truyen
C
duac tinh theo cong thiic:
c-l
t
DSu
E'lal
Mau

Dau
%u
May phat
-
Ihu
sieu am
a)
b)
Hinh
1.7:
May sieu am C386
a) May C386
b)
Cach tien hanh
do
Cac
dac
trung
ciia
may:
Thdi gian
do
duac
tdi da
Do phan giai
Do chinh
xac
Nguon nang luang
Cudng
dp

Thdi gian
lam
viec
Xung sieu
am
9999
^
0.16
fis
±
0.16
ps
12VDC
0.3
A
5 h
vdi
nguon
12 V, 1.9A.h
Bien
do da
lap
trinh
1000 Volt
dinh
750 Volt
dinh
Toe
dd phat
si6u am

/
Bd nhd
Mach ra RS 232
Dai
lugng
do
500 Volt
dinh
250
Voh
dinh
Da lap trinh :
1 pulse/sec
2 pulse/sec
3 pulse/sec
4 pulse/sec
200 gia tri cho mdi dai lugng do
4800 bps
Khdng chin le
8 bit sd lieu
2 bit dimg
Tdc dp
Chieu dai
Thdi gian
Mddun Young
1.2.2.
Thiet bi CLS 2
SCfiEEN
|[HSPI>y)
MliASUREMFfJl KLtCTRONCS

Check'ubes b
CONCRETE
Emetljig prqbe
I'HivriiiKovTHrMJMC
liililil.NCMMIIon
ReceJvijig
probe
f"*v/^^-tv,-;.j^.
Hinh 1.8: Sa do khdi va hinh anh ciia may CLS 2
Trong dd:
Screen (display): bg hien thi
Winch: cam bien do do sau.
10
Check tubes: cac ong de tha bien
tijr
sieu am
Emetting probe: bien
tir
phat sieu am.
Receiving Probe: bie'n
tijr
thu sieu am.
1.3 Ket qua va thao luan.
a.Tien
hanh do trong phdng thi nghiem: Sii dung thiet bi C386
- Ket
qua
tien hanh do cac miu trong phdng thi nghiem, thu dugc:
+ Vdi 2 miu be tong mac 300 va mac 300 + phu gia deo (sika)
Ten miu

Mac 300
Mac 300+phu gia deo
(sika)
Ky hieu miu
2.1
2.2
van
tdc truyen
sieu
am
(m/s)
4388.6
4452.2
Khdi lugng rieng
(kg/cm^)
2.63
2.637
Chung ta thay: su khac nhau ve khdi lugng rieng la nhd nhung vin cd the phat hien
dugc
sir
khac nhau ve van tdc truyen sdng sieu am trong hai moi trudng nay.
+ Vdi cac miu khac, tien hanh do dac trong phdng thi nghiem:
STT
1
2
3
4
5
Ten
mSu

Da
Gach nung
MSu da't 1
Mau dat 2
Mau da't 3
Ky hieu
mSu
3.1
4.1
1.1
1.2
1.3
Van
toe
(m/s)
5681.818
1487.889
1329.787
1373.626
1348.8
He so ha'p
thuCa)
7.25042
18.83898
44.44134
62.29842
50.36067
Khoi
lugng
rieng p

(kg/m^)
2639.463
1672.539
1934.704
1906.504
1862.354
Kich thuoc
mSu
(cm)
1=20,
d=7.45
21.5x9x5.5
5x5x5
5x5x5
5x5x5
11
\
\
\.
N
—I r
•
1
"
1
•
1
'
1
'

1
•ecc :acc ?ooo zxio riK :x3j zboa
•ikg-m)
a)
vim/s)
5CC0
'A(j m)
b)
Hinh 1.9 : Cac ket qua tien hanh do dac trong phdng thi nghiem
Nhu vay:
- Mat do cang
Idn
thi
van
tdc truyen sieu
am
se cang
Idn.
- Ddi vdi he sd ha'p thu: ta tha'y phu thugc nhieu vao mat do hat, dp ddng deu trong
ti^ng
miu khao sat: he sd hap thu la nhd nha't ddi vdi vat lieu la da,
Idn
nha't la miu
dat sd 2.
b.
Tien hanh do tren miu do sir dung thiet bi CLS2
Bang. Ket qua
kiem
tra thi
nghiem

van
toe truyen song trong
moi
trudng
cat, dat,
gach
xay, be
tong bang phi/ong phap
STT
1
Kt hi«i c(K
TN'
DOsait kkiiilrs
im)
1
i
i
Sieu
am
Van l6c trii\^ti !ir>n|i sieu am
trong
lit,
dat.
IriL'itl
00-(i '7
CJI
0.3^-()7J
Ibi
ft.M-^!>7l
Wl-yy7

0."?J^
1.12
l:Sj.VlS6h
gach
Uv,
brlon^
i.i:-
i4>i
Re
titni;
1 :!10(U.;i5S
Hinh 1.10: Ket qua do tren
miu ket hgp
12
-
Six
dung thie't bi CLS2 do tren miu do ket hgp ta thay cd su phan
Idp
ro rang tren
tirng
Idp
do, cd the xac dinh gan chinh xac cac lap khac nhau, nhat la cac loai cd
mat do hat rat khac nhau nhu dat vdi gach xay, dat vdi be tong, gach vdi be tdng.
c.
Tien hanh do tren hien trudng tai tda nha
15
ting Dai hgc Hung Vuang:
i-ix-
no
-

Tube*
J - J
(".i^^.U-l.lOO
luhc&
•s
•
§16
•±i
20:
0
HtOd 2(IO0 3000 -IIJOO 51)(»n 6(HK)
n
1(100 2010 .lono -looo
5000
wtoo
V"cloi:ily(Mcier/set)
Hinh
1.11:
Ke't qua do dac tren 2 cgc 09 va
31
Tiir
ke't qua nay cho ta thay cgc 09 tdt hon cgc
31
Ket luan chung:
Qua qua trinh do dac tren thuc le ta tha'y: van tdc sieu
am
phu thugc vao cac moi
trudng. Cd
sir
phan biet tdc do mot

each
ro rang giira cac mdi trudng. Tdc do tang ddi vdi
cac mdi trudng cd do lien ket
Idn:
tang tir mdi trudng dat cat den gach, be tong. Vdi cac
cot be tdng cd do dong nha't thi tdc do truyen sdng la tuang ddi on dinh. Con cot cd chat
lugng khdng ddng deu thi tdc do truyen sdng thay doi
Idn.
Vdi ket qua nay chiing ta cd the khang dinh : cd the dung sdng sieu am de tham dd
Idng
da't. Cd the thu dugc tin hieu phan xa
tij
cac
Idp
vat lieu khac nhau
tir
do cd the diing
ky thuat mach dien
tix
de su ly tin hieu thu dugc thanh hinh anh cac
Idp
dat da dudi long
dat phuc vu cho viec tham dd long da't d do sau dudi
Im.
13
Chuang 2: Che tao may phat sieu am.
2.1 So do mach dien.
2.1.1
Sado
khdi.

Phat tin hieu
dong bd
(1)
Chinh do
rdng xung
(2)
—•
Phat tan sd
cdng hudng
(40kHz-
500kHz)
(3)
!
Khuech dai
(4)
1
'
Bien
iix
phat sieu
am
(5)
Hinh
2T:
Sa dd khdi may kich phat sieu am
(1):
Khdi phat tin hieu ddng bg: phat tin hieu ddng bg cho toan bg he thdng
(2):
Khdi chinh do rgng xung: thay
ddi

do rgng
ciia
xung
kich
phat sieu am.
(3):
Khdi phat tan sd cong hudng: tao xung vd tuyen ben trong xung kich phat sieu am,
tan sd xung vd tuyen cd the dugc dieu chinh
phii
hgp vdi tan sd cdng hudng ciia bien
tir
phat de sdng sieu am dugc phat ra vdi cudng do
Idn
nha't.
(4):
Khdi khue'ch dai: khue'ch dai xung kich phat sieu am
tijr
12V p-p len tdi tren 200V p-p
(5):
Bie'n
tir
phat sieu am: bien tu ap dien phat sieu am truyen vao moi trudng khao sat.
(1)
(2)
(3)
(4)
(5)
D
D
Hinh 2.2: Gian dd xung

14
2.1.2 Mach phat
tin
hieu dong bo:
vcc
vcc
UI
1 RST
VCC
H„iiMi
II'
I'liliHiBii
CVOLT DISC
—
C2
104
•
> ^i
I
TRIG
^
GND
NE555a
OUT
i
-^iit 1
Rl
400K
\2
400K Ii

20.0hs:
WltllUlllMlllllll'P
|l^
11.53935Hz
II h
ii»iit"
•> I
•• •
"1
a)
. ^) .
Hinh 2.3: Bd phat xung dong bg va tin hieu dau ra
a) Sa dd bg phat b) Tin hieu dau ra
Outl
t,=
0.693
(R1+R2)C2
t2 =
0.693 (R2)
C2
T = ti+t2 =
0.693
(R,+2R2)C2
Prod(Cl) 86.66ns ^eo.ochs
/4^
.44
T
(/?,
+2/?2)C2
Thay vao cac gia tri tuang

iing
tren chiing ta thu dugc: f=12Hz
ti=0.055
s
t2=0.027 s
Thuc nghiem thu dugc tan sd la
11.54
Hz
tl=0.058 s
t2=0.028
s
t=0.08
s
2.1.3 Mach
chinh
do rgng xung:
Tin hieu ndi ra ciing tan sd vdi tin hieu ndi vao, tuy nhien do rgng xung cua
tin
hieu
ndi ra cd the thay doi dugc bang
each
thay ddi gia tri VR
15
vcc Out
r
VR
VCC
lnM)uli
V
V

I
02
_
i
m
VCC
—==cr^i™^
6'
CVOLT
DISC-
Out2
103
OUTHJM:^;
KE;5}D
TS.BEV
b)
a)
^
c)
Hinh 2.4: Bg chinh do rgng xung
a) Sa do nguyen ly b) Tin hieu dau ra Out 2 vdi tin hieu ddng bg Outl
c) Do rgng mot xung cua Out 2
Do rgng phin
miic
cao dugc tinh theo cdng
thurc:
t=l.l*VR*C2
Vdi:
gia tri
VR=116.3kohm

C2=10-'^
Thi
i=l2S JUS
bien tix phat manh nha't.
16
2.1.4 Bo phat tan sd cong
hudng;
vcc
In
J = Qui
2
:C2:
102
U3
^
5
;
RST
THR
CVOLT
CI
i™^
S''
^
GND
Nt555D'
VRI
5flK
VCC
vcc

p^
7
.
©tse-
VR2
50K
OUT
Gill 3
Out
2
?HB
•^
k,
>-P
<iCl> 13.8933U
neq<CI)
Out
3
•"
a) b)
Hinh 2.5: Bd phat tin sd cdng hudng
a) Sa dd nguyen ly b) Tin hieu dau ra Out 2 va Out
3
Dau
ra
Out
3
dugc dieu
khie'n
bdi tin hieu

ra
bg
thii
2. Khi
tin
hieu
ra
bg
thu*
2 la
miic
cao, dau ra Uot 3 se la tin hieu dao ddng vdi tin sd rieng dugc tinh:
1
_ 1.44
' '
T,
'
{VR,+2VR^)C^
Tin sd diu ra cd the dugc dieu chinh tit 40kHz den 500kHz
2.1.4 Bd khuech dai:
vtc
In
4-Out
J
lensxs
i«eM^i.
Out
3
Tin hieu tren bie'n
til

thu
Mm\f^/v\/^^
p-p
(CD
12,666AP
(CD
ig.3us
Coupling
DClfVt
lYestcn 51.B1347kHz
SflO.
(K.»
Probe
t:l
B
Offset
e.eo
u
CHI
1:1
z.ee
u/diu
DC
Full
CHZ
1:1
2.ee
u^diu
DC
run

ft
->
B(N)
Auto
Banduidth
Full
•^^^AT
Next
(l^2)
a)
b)
Hinh 2.6: Bd khuech dai
a) Sa dd nguyen
ly
b) Tin hieu dau ra Out 3 va tin hieu sieu am
17
-^1 HOC QUOC GIA HA
NOI
^
I^UNG
TAM
THONGj]N_r^^^
Tin hieu ra
Out3
dugc dua qua lang khue'ch dai darlington de khue'ch dai ddng, tin hieu
tren colector ciia T, dua vao bien the, tin hieu dau ra
ciia
bien the dat dugc
* 230 K
kich

vao hai
dSu
bie'n
tir
sieu am, bien tix se phat ra cac
chijm
xung sieu am vdi tan sd lap lai
bang
t^n
sd dong bd cua khdi 1.
2.2 Ket qua va thao luan.
Da tao dugc may phat sieu
am
vdi tan sd cd the dieu chinh 40kHz den 500kHz va
kich phat dugc bien
tir
sieu am.
Bien tu sieu am da phat dugc theo timg
chijm
vdi tan sd bang tin sd ciia bd phat
ddng bg. Tan sd sdng sieu am la 63.9 kHz, bien do
Idn
nha't dat dugc 9.2 V p-p
rt>KOCAWft»
BOkS^S Z&nviu YCK0GA«4
1
4
:
au.
DO

J
<(
rtainllOlc
>>
P-P
1
-100.Oft*
-jPiTip^*
CD
11.2500U
n-eq
CI) eo.eus
It
1~-
•
f^
1 1 • ri
i.
_
01 > 16.66667I(HZ
1
DO.OOnl
a)
lens/s imuMm
yyy\f^/\A^wwwvvv^•«*
p-p
<C1) 1Z.6667U
nr^(Cl> 51.81347kHz
b)
yCHOGAWftf

lens/s
lediMi.
<<
MamllOk
>>
4.5eMW
4.7»eeeu
3.2m6W
m^^^
YOKOGWH
•
-ta?
I'-P
(C2)
9.d3333U
rres<cz)
PP0d(C2)
63.9386ZkHz
15.64US
c) d)
Hinh 2.7: Tin hieu phat sieu am
a,b: Xung sieu am thu tren bien tu thu va xung
kich
phat
cd:
Chiim
sieu am tai bien tu thu
sens^
2«Muii.
18

Thii*
nghiem
ihict
bi phat sieu am: bien
tir
sieu am dugc kich phat dat vao hai dau
ciia mSu mSu xi mang ky hieu 5.1
(hinh
2.6 a), diing dao dong ky do tin hieu tai bie'n tu
thu,
so sanh vdi thdi diem bat dau kich phat sieu
am
la cd thdi gian truyen qua ciia sdng
sieu am:
Van tdc sdng sieu
am
se la:
A/
=
52/zy
/
200.10
A/
52.10
=^3846w/.y
]—mv
«
Ptain:]<>
>>
a) b)

Hinh
2.8: May phat sieu am va tin hieu thu dugc sau khi truyen qua
mau
a) May phat sieu am
b) Tin hieu thu dugc :
b] :
tin
hieu
ciia
xung
kich
phat va xung sieu am thu dugc sau khi qua
mau
b2 :
khuech
dai
hinh
anh
ciia
bl
19
Ket kuan.
So sanh vdi muc tieu de ra ciia de tai, ket qua thu dugc ciia chiing tdi da hoan thanh
dugc muc tieu de ra.
1.
Thiet ke lap rap thanh cdng may phat sieu am tan sd 50kHz den 500kHz.
2.
Khao sat dugc quy luat bien doi
van
tdc truyen sdng sieu am trong cac mdi

trudng thd,
tiif
dd khang dinh cd kha nang
dijng
sdng sieu am tham dd
Idng
dat.
3.
Cd mpt bao cao khoa hgc tai hoi nghi khoa hoc trudng Dai hoc
S\x
pham Ha Ndi 2
thang
11
nam 2007: Mot sd ket qud nghien cuu qua trinh truyen song sieu dm
trong moi trudng ddt
dd,
be tong
4.
2 khoa luan tdt nghiep sinh vien.
Hudng phat trien tie'p theo ciia de tai la che
lao
may tham dd long dat phuc vu cdng
tac khao co hoc hien thi hinh anh 3D.
20
Tai lieu tham khao.
1.
Sieu am, nguyen ly va
iing
dung. Nguyen Viet Kinh, Nguyin Dang Lam.
2.

Tai lieu chuyen khao
ki^m
tra khdng pha hiiy bang phuang phap sieu am. Khoa Vat
Ly - Dai hgc Tong hgp Ha Ndi.
3.
Hudng dan sii dung may
thir
sieu am Tyce C368. PGS.TS Cao Chi Dung - Vien ca
hgc.
4.
CSL2
Manual.
21
Phu luc
L Photocopy bai bao kem bia va muc luc Tap chi cong bd
01 bao cao Hoi nghi Khoa hgc Dai hgc Su pham 2, 2007
Nguyfin
Dang Lam, Pham Van Thanh, Ngo Quy Them, Mot
sdket
qud
nghien
cdu
qua trinh truyen song sieu dm trong mdi
trucmg
ddt dd, be tong, tr. 58, Hdi nghi
Khoa hgc Dai hgc Su pham 2, 2007.
2.
Photocopy bia luan van Dai hgc dugc thuc hien theo hudng de tai
Khda luan Dai hgc:
• Tran Trgng Nghia, K48 Vat ly, Phuang phdp kiem tra khuyet tat trong khdi

be tong bdng mdy thd
sieu
dm type C386, 2007.
• Tran Van Hieu,
Xdy
dung
thie't
bi phdt song sieu dm, 2007
22
BOGiAoOUf;
VADAOiAO
TRl/ONG
OAI HOC SU PHAM HA NOI 2
KY YFAJ
Hi!
iGHi
md^
HOC
7
HA
.\OI
- 2007
23
MUC LUC
1.
Phat bieu khai mac cua Hieu
tri/dng
3
2.
Danh muc cac tdm tat bao cao 7

3. Tieu ban: Van hgc 7
4.
Tieu ban: Ngdn
ngCr
25
5. Tieu ban: KHGD - GDTC & GDTC 31
6. Tieu ban: Toan - Tin 44
7. Tieu ban: Vat ly 55
8. Tieu ban: Hoa hgc 65
9. Tieu ban: Sinh - KTNN 81
10.
Muc luc
99
24
Hpi nghi
Khoa hoc 2007
hieu
SO
radar hien dai. thuc hien
iren
bo mach
TMS320C6416T
DSK
ciia
hang Texas Instrument. Cac
chucmg irinh
ma ngu6n
C
viet vdi su trg giup
cua phan

m6m
Mallab SPtooI di tao ra cac tap he sd cho cac bd
lpc.
D'ltm
thu vi cua cac
bO lpc
nay
la chi
c^n
thay d6i cac tap
he
s6 trong
mpt
chuang trinh ma ngudn C duy
nhit
la ta co
th^
tao ra
dupe
cac loai bp loc
khac nhau vdi cac dac trung
tin
sd hoan toan khac
bi6t.
7. Mpt so ket qua nghien
cCfu
qua trinh truyen song sieu am
trong moi
tradng
ddt da, be tong

Nguyen
Ddng Lam,
Pligm
Vdn Thdnh
Dgi
hoc Qudc gia Ha
Noi
Ngo Quy
Tliem
Vien
Ca,
Vien KH&CN Viet
Nam
B^o
cao
trinh
bay nhung ket qua budc dau cua
vi^c
nghien
ciiu,
khao
.sal
qua trinh truyen song sieu
am
trong m6i tmdng da't, da, be
i6ng.
Nhom tac gia bao cao da do
dupe van tO'c
truyen song sieu
am

trong cac
moi trudng tren, khao sat danh gia
dupe
kha nang
truyen
qua
ciia
song
sieu
am
va danh gia kha nang thu song phan xa khi s6ng gap cac lap dia
tang khac nhau.
Cac ket qua tren khang dinh kha nang
diing
song sieu am chup anh
Idp
dia
lang gan
mat da't dudi
1
m.
8. Influence of atom density on criticaltemperature Tc in
high-tc superconductors
Nguyen The Lam
Hanoi Pedagogic
Univer.stty
No 2
It
will show
ihai,

the Cooper pairing may be
represented
by our
Coopc^r
pairing
potential.
With the Cooper
pairing,
the received
energy
spectrum of
elccirons
is suit as other
theories The
low density of atoms
58
25