| ²é¿´: 3102 | »Ø¸´: 5 | |||
| µ±Ç°Ö»ÏÔʾÂú×ãÖ¸¶¨Ìõ¼þµÄ»ØÌû£¬µã»÷ÕâÀï²é¿´±¾»°ÌâµÄËùÓлØÌû | |||
yush087гæ (³õÈëÎÄ̳)
|
[ÇóÖú]
ºË´ÅÐÅÔë±È
|
||
| ºË´ÅÐÅÔë±ÈÔõô¼ÆË㣿ÈçºÎ¸ü׼ȷµÄ¼ÆË㣿 |
» ÊÕ¼±¾ÌûµÄÌÔÌûר¼ÍƼö
NMR&MRI |
» ²ÂÄãϲ»¶
Ò»Ö¾Ô¸±±¾©»¯¹¤´óѧ070300 ѧ˶336Çóµ÷¼Á
ÒѾÓÐ8È˻ظ´
Ò»Ö¾Ô¸¶«»ª´óѧ»¯Ñ§070300£¬Çóµ÷¼Á
ÒѾÓÐ6È˻ظ´
318Çóµ÷¼Á
ÒѾÓÐ7È˻ظ´
Çóµ÷¼ÁÒ»Ö¾Ô¸º£´ó£¬0703»¯Ñ§Ñ§Ë¶304·Ö£¬Óдó´´ÏîÄ¿£¬Ëļ¶Òѹý
ÒѾÓÐ6È˻ظ´
Ò»Ö¾Ô¸ÎäÀí²ÄÁϹ¤³Ì348Çóµ÷¼Á
ÒѾÓÐ5È˻ظ´
Çóµ÷¼Á
ÒѾÓÐ7È˻ظ´
275Çóµ÷¼Á
ÒѾÓÐ6È˻ظ´
ÕÐ08¿¼Êýѧ
ÒѾÓÐ7È˻ظ´
303Çóµ÷¼Á
ÒѾÓÐ6È˻ظ´
306Çóµ÷¼Á
ÒѾÓÐ4È˻ظ´
boringboring
гæ (³õÈëÎÄ̳)
- Ó¦Öú: 1 (Ó×¶ùÔ°)
- ½ð±Ò: 24.3
- Ìû×Ó: 21
- ÔÚÏß: 4.9Сʱ
- ³æºÅ: 2554964
- ×¢²á: 2013-07-20
- רҵ: ²¨Æ×·ÖÎöÓë³ÉÏñ·ÖÎö
¡¾´ð°¸¡¿Ó¦Öú»ØÌû
|
In theory, signal-to-noise ratio S/N can be done in the following way. Process your spectrum, well phase it and correct the baseline. Locate the strongest peak, integrate over it, (say 0.1 ppm depending the peak width) and the integration is the signal. Now, randomly integrate over N noise regions (i.e., the non-peak regions) of 0.1 ppm wide. The average integration is the noise. signal/noise = S/N Some folks like to figure out S/N using peak height of the strongest peak and the height of the noise regions. They will run into argument of peak-to-peak or root-mean-square noise heights. |
3Â¥2013-07-26 04:37:12
cjzhu
ľ³æ (ÖøÃûдÊÖ)
- Ó¦Öú: 390 (˶ʿ)
- ½ð±Ò: 3186.6
- ºì»¨: 88
- Ìû×Ó: 1966
- ÔÚÏß: 3261.3Сʱ
- ³æºÅ: 727004
- ×¢²á: 2009-03-20
- רҵ: ºË´Å
¡¾´ð°¸¡¿Ó¦Öú»ØÌû
¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
| ²¼Â³¿ËµÄºË´ÅÒÇÓÐsinoÃüÁî¿ÉÒԲⶨÐÅÔë±È£¬¾ßÌ幫ʽ¿ÉÒÔ help sino ²é¿´¸ÃÃüÁîµÄ°ïÖúÎļþ¡£ |
2Â¥2013-07-20 10:17:31
suruiqin
°æÖ÷ (ÖªÃû×÷¼Ò)
- Ó¦Öú: 195 (¸ßÖÐÉú)
- ¹ó±ö: 1.84
- ½ð±Ò: 6267
- É¢½ð: 20242
- ºì»¨: 151
- ɳ·¢: 162
- Ìû×Ó: 8368
- ÔÚÏß: 910.3Сʱ
- ³æºÅ: 1875887
- ×¢²á: 2012-07-02
- ÐÔ±ð: MM
- רҵ: É«Æ×·ÖÎö
- ¹ÜϽ: ·ÖÎö

4Â¥2013-07-26 09:58:51
pisceswu
½ð³æ (СÓÐÃûÆø)
- Ó¦Öú: 4 (Ó×¶ùÔ°)
- ½ð±Ò: 936.7
- ºì»¨: 11
- Ìû×Ó: 101
- ÔÚÏß: 92.7Сʱ
- ³æºÅ: 2191599
- ×¢²á: 2012-12-17
|
noise ²»ÊÇ»ý·ÖµÃµ½µÄ¡£ ÀíÂÛÉÏÄã¶Ônoise»ý·Ö£¬½á¹û¾ÍÊÇÎÞÏÞ½Ó½üÓÚ0. Æ×ͼÉÏÈκÎÒ»¸öµã¶¼ÊÇÓÐ ÐźŠu ºÍ ÔëÒô sigma ×é³É¡£ ÔÚ»ùÏßλÖã¬ÐźÅΪ0£¬Ö»Ê£ÏÂÔëÒô¡£Ëã±ê×¼·½²î¿ÉÒԵõ½ÔëÒôµÄ´óС¡£ ×î¸ß·åµÄλÖã¬ÐźÅÏà¶ÔÔëÒô´óºÜ¶à¡£¿ÉÒÔÖ±½ÓÈÏΪȫÓÉÐźŹ¹³É¡£ ÐźÅ/ÔëÒô=ÐÅÔë±È S/N ÐźÅѡȡµÄλÖò»Í¬£¬SÊDz»Ò»ÑùµÄ¡£ËãµÄS/N¶¼Êǵ¥Ö¸Ä³Ò»¸öÇø£¨Ä³Ò»´¦£©µÄ¡£ |
5Â¥2013-07-26 11:13:48













»Ø¸´´ËÂ¥