¹ÌÌåÎïÀíÏ°ÌâÏê½â

Ϊb1?2?i?3.14?1010i£¬b2?1.57?1010j£¬ÓÉ´Ë¿É×ö³ö´Ë¾ØÐξ§¸ñµÄµ¹¸ñ×ÓͼÈçÏÂͼa1.57¡Á1010m-1 5.3Ëùʾ£º ͼ5.3 ¾ØÐξ§¸ñµÄµ¹¸ñ×Ó £¨2£©¸Ã¾ØÐξ§¸ñµÄµÚÒ»²¼ÀïÔ¨ÇøºÍµÚ¶þ²¼ÀïÔ¨ÇøÈçÏÂͼ5.4Ëùʾ£º ͼ5.4 ¾ØÐξ§¸ñµÄµÚÒ»ºÍµÚ¶þ²¼ÀïÔ¨Çø £¨3£©Éè¸Ã¶þά¾ØÐξ§¸ñ¾§Ì庬ÓÐN¸öµç×Ó£¬ÓÉÓÚ·ÑÃ×ÃæÊÇk¿Õ¼äÕ¼Óеç×ÓÓë²»Õ¼Óеç×ÓÇøÓòµÄ·Ö½çÃ棬ËùÒÔÓÐÏÂʽ³ÉÁ¢ Óɴ˵à kF?ÉÏʽÖÐn?2?(N1/2)?2?n1/2 SNΪ¸Ã¶þά¾§¸ñ¾§ÌåµÄµç×ÓÃܶȡ£ SÓÚÊÇ¿ÉÇóµÃ¸Ã¶þά¾§¸ñ¾§ÌåµÄ·ÑÃ×ÃæµÄ°ë¾¶Îª

ÓÉ´Ë¿É×ö³ö×ÔÓɵç×ӵķÑÃ×ÃæÈçÏÂͼ5.5ÖÐÔ²ÃæËùʾ£º

ͼ5.5 ¶þά¾ØÐξ§¸ñµÄ·ÑÃ×ÃæÔ²

18.Ö¤Ã÷£ºÓ¦ÓýôÊø¸¿·½·¨£¬¶ÔÓÚһάµ¥Ô­×ÓÁ´£¬ÈçÖ»¼Æ¼°×î½üÁÚÔ­×Ó¼äµÄÏ໥×÷Óã¬Æäs̬µç×ÓµÄÄÜ´øΪ

E(k)?Emin?4Jsin2(ka/2)¡£

ʽÖУºEminΪÄÜ´øµ×²¿µÄÄÜÁ¿£»JΪ½»µþ»ý·Ö¡£²¢ÇóÄÜ´øµÄ¿í¶È¼°ÄÜ´ø¶¥²¿ºÍµ×²¿µç×ÓµÄÓÐЧÖÊÁ¿¡£

½â£ºÉès̬µÄÔ­×ÓÄܼ¶Îª?s£¬µ±Ö»¼Æ¼°×î½üÁÚ¸ñµãµÄÏ໥×÷ÓÃʱ£¬ÔòÓýôÊø¸¿·½·¨¿ÉÇóµÃ¸Ãһάµ¥Ô­×ÓÁ´µÄs̬µç×ÓÄÜÁ¿Îª

ÉÏʽÖÐJ0????i(¦Î)[U(¦Î)?V(¦Î)]d¦Î?0£¬

?2* J(Rs)???i(¦Î?Rs)[U(¦Î)?V(¦Î)]?i(¦Î)d¦Î?0£¨ÆäÖÐU(¦Î)±íʾ¾§ÌåÖеÄÖÜ

ÆÚÐÔÊƳ¡£¬Ò²¼´¸÷¸ñµãÔ­×ÓÊƳ¡Ö®ºÍ¡£V(¦Î)Ϊij¸ñµãµÄÔ­×ÓÊƳ¡£©

41

ÓÉÓÚs̬²¨º¯ÊýÊÇÇòÐζԳƵģ¬Òò¶øÔÚ¸÷¸ö·½ÏòÖصþ»ý·ÖÏàͬ¡£

ÔÚһάµ¥Ô­×ÓÁ´ÖУ¬Ã¿¸öÔ­×ÓÖÜΧÓÐ2¸ö½üÁÚ¸ñµã£¬Æä¸ñʸ·Ö±ðΪaiºÍ?ai£¬ÓÉ´Ë¿É֪һάµ¥Ô­×ÓÁ´µÄs̬µç×ÓÄÜÁ¿¿É»¯Îª£º

*ÉÏʽÖÐJ?J(ai)?J(?ai)???i(¦Î?ai)[U(¦Î)?V(¦Î)]?i(¦Î)d¦Î?0

?ÓÉ´Ë¿ÉÖª£¬µ±k?0ʱ£¬¼´ÄÜ´øµ×µÄÄÜÁ¿ÎªEmin??s?J0?2J£»µ±k??¶¥µÄÄÜÁ¿ÎªEmax??s?J0?2J

ÓÚÊÇ¿ÉÖ¤µÃһάµ¥Ô­×ÓÁ´µÄs̬µç×ÓÄÜÁ¿Îª ²¢ÇÒ»¹¿ÉµÃÄÜ´ø¿í¶ÈΪ?E?Emax?Emin?4J

?a£¬¼´ÄÜ´ø

d2E?2?2ÓÉ´Ë»¹¿ÉÇóµÃÓÐЧÖÊÁ¿m(k)??/ 2dk2aJcoska*2?2ÓÚÊÇ¿ÉÇóµÃÄÜ´ø¶¥²¿µÄµç×ÓÓÐЧÖÊÁ¿m?m(?)??

a2a2J**??2ÄÜ´øµ×²¿µÄµç×ÓÓÐЧÖÊÁ¿m?m(0)?¡£ 22aJ**19.Éè¶þάÕýÈý½ÇÐξ§¸ñÖÐÔ­×Ó¼ä¾àΪa£¬ÊÔ¸ù¾Ý½ôÊø¸¿½üËƵĽá¹û£¬Çó³öÄÜ´øE(k)µÄ±í´ïʽ£¬²¢Çó³öÏàÓ¦µÄµç×ÓËÙ¶Èv(k)ºÍÓÐЧÖÊÁ¿µÄ¸÷¸ö·ÖÁ¿

m??¡£

½â£ºµ±Ö»¼Æ¼°×î½üÁÚ¸ñµãµÄÏ໥×÷ÓÃʱ£¬¸ù¾Ý½ôÊø¸¿½üËƿɵøþ§¸ñÓÉÔ­×Ós̬µÄÐγɵÄÄÜ´ø±í´ïʽΪ

ÉÏʽÖÐJ0??E(k)??s?J0?Rs?½üÁÚ?J(Rs )e?k?Rs ¡­¡­¡­¡­¡­¡­¡­£¨1£©

??(¦Î)i2[U(¦Î)?V(¦Î)]d¦Î?0£¬

* J(Rs)???i(¦Î?Rs)[U(¦Î)?V(¦Î)]?i(¦Î)d¦Î?0£¨ÆäÖÐU(¦Î)±íʾ¾§ÌåÖеÄÖÜ

?ÆÚÐÔÊƳ¡£¬Ò²¼´¸÷¸ñµãÔ­×ÓÊƳ¡Ö®ºÍ¡£V(¦Î)Ϊij¸ñµãµÄÔ­×ÓÊƳ¡£©

Ôڴ˶þά¾§¸ñÖУ¬È¡Ô­µãΪ²Î¿¼µã£¬ÔòÆäÁù¸ö½üÁÚ¸ñµã×ø±êֵΪ £¨a£¬0£© £¨?a£¬0£© £¨

13a£¬a£©£¬ 22£¨?111333a£¬a£© £¨a£¬?a£© £¨ ?a£¬?a£© 222222°Ñ½üÁÚ¸ñʽRs´úÈ루1£©Ê½£¬²¢¿¼Âǵ½s̬²¨º¯ÊýµÄÇò¶Ô³ÆÐԿɵãº

42

??s?J0?2J1[cosakx?cos(akx?12313 aky)?cos(akx?aky)] ¡­¡­£¨2£©

222ÉÏʽÖÐJ1±íʾԭµãËù´¦¸ñµãÓëÈÎÒ»×î½üÁÚ¸ñµãµÄ²¨º¯ÊýµÄÖصþ»ý·ÖµÄ¸ºÖµ£¬²¢ÓÐ

J1?0¡£

ÓÉ´Ë¿ÉÖªÏàÓ¦µÄµç×ÓËÙ¶ÈΪ

*Ñ¡È¡kx£¬kyÖáÑØÕÅÁ¿Ö÷Öá·½Ïò£¬ÔòÓÐm*?mxyyx?0£¬¶ø

20.ÓýôÊø¸¿·½·¨´¦ÀíÃæÐÄÁ¢·½µÄs̬µç×Ó£¬ÈôÖ»¼Æ¼°×î½üÁÚÏ໥×÷Óã¬ÊÔµ¼³öÆäÄÜ´øΪ ²¢ÇóÄÜ´øµ×²¿µç×ÓµÄÓÐЧÖÊÁ¿¡£

½â£ºµ±Ö»¼Æ¼°×î½üÁÚ¸ñµãµÄÏ໥×÷ÓÃʱ£¬ÓýôÊø¸¿½üËÆ·½·¨´¦Àí¾§ÌåµÄs̬µç×Ó£¬ÆäÄÜ´øE(k)µÄ±í´ïʽ¿ÉдΪ

ÉÏʽÖÐE0??s£¬A????(¦Î)i2[U(¦Î)?V(¦Î)]d¦Î?0£¬

* J??i(¦Î?Rs)[U(¦Î)?V(¦Î)]?i(¦Î)d¦Î?0£¨ÆäÖÐU(¦Î)±íʾ¾§ÌåÖеÄÖÜÆÚÐÔÊÆ

?³¡£¬Ò²¼´¸÷¸ñµãÔ­×ÓÊƳ¡Ö®ºÍ£»V(¦Î)Ϊ×î½üÁÚ¸ñµãµÄÔ­×ÓÊƳ¡£»RsΪ×î½üÁÚ¸ñµãµÄλʸ£©¡£

¶ÔÃæÐÄÁ¢·½¾§¸ñ£¬È¡Ô­µãΪ²Î¿¼µã£¬ÔòÆä×î½üÁÚµÄ12¸ö¸ñµãµÄλʸ×ø±êֵΪ

aaaaaaaa£¬£¬0£©£¬£¨£¬?£¬0£©£¬£¨?£¬£¬0£©£¬£¨?£¬?£¬0£© 22222222aaaaaaaa£¨£¬0£¬£©£¬£¨£¬0£¬?£©£¬£¨?£¬0£¬£©£¬£¨?£¬0£¬?£© 22222222aaaaaaaa£¨0£¬£¬£©£¬£¨0£¬£¬?£©£¬£¨0£¬?£¬£©£¬£¨0£¬?£¬?£©

22222222£¨

½«ÉÏÊöµÄ12Ì××ø±êÖµ´úÈëÉÏÊöµÄE(k)µÄ±í´ïʽ£¬¿ÉµÃ

ÓÉÓÚJ?0£¬ËùÒÔµ±kx?ky?kz?0ʱ£¬E(k)ÓÐ×îСֵEmin?E0?A?12J£¬¼´ÎªÄÜ´øµ×²¿¡£

Ñ¡È¡kx£¬ky£¬kzÖáÑØÕÅÁ¿Ö÷Öá·½Ïò£¬ÔòÓÐmxy?myx?mxz?mzx?myz?mzy?0£¬¶øÔÚÄÜ´øµ×²¿ÓÐ

******43

44

ÁªÏµ¿Í·þ£º779662525#qq.com(#Ì滻Ϊ@)