Dongosolo Loyesera la LADP-2 la Pulsed NMR

Kufotokozera Kwachidule:

Pulsed Fourier transform nuclear magnetic resonance imagwiritsa ntchito pulsed RF field kuti igwire ntchito pa nyukiliya kuti ione momwe nyukiliya imayankhira ku pulse, ndipo imagwiritsa ntchito ukadaulo wachangu wa Fourier transform (FFT) kuti isinthe chizindikiro cha nthawi kukhala chizindikiro cha frequency domain, chomwe ndi chofanana ndi mafunde angapo a single frequency continuous wave. Ma spectrometer a nuclear magnetic resonance amasangalatsidwa nthawi imodzi, kotero kuti chodabwitsa cha nuclear magnetic resonance chikhoza kuwonedwa pamlingo waukulu, ndipo chizindikirocho chili chokhazikika. Pakadali pano, njira ya pulse imagwiritsidwa ntchito mu ma spectrometer ambiri a NMR, pomwe njira ya pulse imagwiritsidwa ntchito mu MRI.

Tumizani imelo kwa ife

Tsatanetsatane wa Zamalonda

Ma tag a Zamalonda

Zoyesera

1. Kumvetsetsa chiphunzitso choyambira cha thupi ndi kasinthidwe koyesera ka dongosolo la PNMR. Phunzirani kufotokoza zochitika zokhudzana ndi thupi mu PNMR pogwiritsa ntchito chitsanzo cha vekitala yakale.

2. Phunzirani kugwiritsa ntchito zizindikiro za spin echo (SE) ndi free induction decay (FID) poyeza T₂(nthawi yopumula ya spin-spin). Unikani mphamvu ya homogeneity ya mphamvu ya maginito pa chizindikiro cha NMR.

3. Phunzirani kuyeza T₁(nthawi yopumula ya spin-lattice) pogwiritsa ntchito reverse recovery.

4. Kumvetsetsa bwino momwe njira yopumulira imagwirira ntchito, onani momwe ma paramagnetic ions amakhudzira nthawi yopumulira ya nyukiliya.

5. Muyeso T₂ya yankho la copper sulfate pamlingo wosiyanasiyana. Dziwani ubale wa T₂ndi kusintha kwa kuganizira.

6. Yesani kusamuka kwa mankhwala kwa chitsanzo.

Mafotokozedwe

Kufotokozera	Mafotokozedwe
Mphamvu ya gawo la modulation	mphamvu yayikulu 0.5 A, mphamvu yamagetsi 0 - 6.00 V
Mphamvu ya gawo lofanana	mphamvu yayikulu 0.5 A, mphamvu yamagetsi 0 - 6.00 V
Mafupipafupi a oscillator	20 MHz
Mphamvu ya maginito	0.470 T
M'mimba mwake mwa pole ya maginito	100 mm
Mtunda wa maginito	20 mm
Kugwirizana kwa maginito	20 ppm (10 mm × 10 mm × 10 mm)
Kutentha kolamulidwa	36.500 °C
Kukhazikika kwa maginito	Kufunda kwa maola 4 kuti kukhazikike, mafunde a Larmor akuyenda osakwana 5 Hz pamphindi.

Mndandanda wa Zigawo

Kufotokozera	Kuchuluka	Zindikirani
Chigawo Chotentha Chokhazikika	1	kuphatikizapo maginito ndi chipangizo chowongolera kutentha
Chigawo Chotumizira RF	1	kuphatikizapo magetsi a gawo la modulation
Chigawo Cholandirira Zizindikiro	1	kuphatikizapo magetsi a malo ofanana ndi chiwonetsero cha kutentha
Chingwe cha Mphamvu	1
Zingwe Zosiyanasiyana	12
Machubu a Zitsanzo	10
Buku Lophunzitsira	1