【正文】 和永磁體剩余磁場(chǎng)強(qiáng)度（圖14）之間的關(guān)系，以及磁懸浮力曲線與超導(dǎo)樣品厚度和縱橫比的關(guān)系（圖15） 圖14 磁懸浮力曲線隨不同等效電流和永磁體不同的剩余磁場(chǎng)的變化 圖15 磁懸浮力曲線與超導(dǎo)樣品厚度和縱橫比的關(guān)系 [1] F. Hellman, E. M. Gyorgy, D. W. Johnson, Jr.,H. M. O’Bryan, and R. C. Sherwood, ”Levitation of a magnet over a ?at typeII superconductor”, J. Appl. Phys 63, 447450(1988).[2]W. G. Harter, A. M. Hermann, and Z. Z. Sheng, ”Levitation e?ects involving high Tc thallium based superconductors”, Appl. Phys. Lett. 53, 11191121(1988). [3] F. Hellman, E. M. Gyorgy, D. W. Johnson, Jr.,H. M. O’Bryan, and R. C. Sherwood, ”Levitation of a magnet over a ?at typeII superconductor”, J. Appl. Phys 63, 447450(1988). [4] A. R. Conn, N. I. M. Gould, Ph. L. Toint, LANCELOT: A Fortran Package for LargeScale Nonlinear Optimization, Springer Series in Computational Mathematics(Springer Verlag, Berlin 1992).[5] J. R. Hull 2000 Supercond. Sci. Techno. 13 R1。 Appl. Phys. Lett. 90 042503.[17] D. L. Shi, D. Qu. Sagar, and K. Lahir 1997Appl. Phys. Lett. 70 3606.[18] Y. S. Cha, J. R. Hull, T. M. Mulcahy, and T. D. Rossing, J. Appl. Phys. 70, 6504 (1991).[19] B. Lehndorff, H. G. K252。 Phys. Rev. Lett. 8, 250 (1962).[25] For example, K. V. Bhagwat and P. Chaddah, Pramana 33, 521 (1989)。 P. N. Mikheenko and Y. E. Kuzovlev, Physica C 204, 229 (1993)。 M. W. Coffey Phys. Rev. B 52 R9851(1995)。李老師將總結(jié)的研究方法和積累的科研經(jīng)驗(yàn)都毫無(wú)保留地向我傳授，所有這一切將使我終生受益。其實(shí)，我從大一下學(xué)期就結(jié)識(shí)了李老師，在以后的學(xué)習(xí)和生活中，李老師給了我很多幫助和關(guān)懷。2009年下學(xué)期，李老師每周都抽出二個(gè)小時(shí)間給我我講解他在超導(dǎo)理論方面的科學(xué)探索，李老師知識(shí)淵博，思維敏捷，思路開(kāi)闊，考慮問(wèn)題細(xì)致而周全，從他身上我了解了開(kāi)展科研工作的方法和步驟，知道了從事科研所必備的素質(zhì)和精神。畢業(yè)設(shè)計(jì)期間，與他們共同合作，相互學(xué)習(xí)，一起談?wù)摚刮沂芤娣藴\。27。這段珍貴的學(xué)習(xí)經(jīng)歷使我受益匪淺，無(wú)論是學(xué)術(shù)上還是人生閱歷上，對(duì)我以后的發(fā)展有很大的幫助。在平時(shí)的學(xué)習(xí)和生活當(dāng)中，我得到了許多同學(xué)的幫助和真誠(chéng)的鼓勵(lì)，在此表示衷心的感謝。李老師經(jīng)常鼓勵(lì)我勤于思考，敢于質(zhì)疑，勇于創(chuàng)新。感謝賈瑜教授、孫強(qiáng)教授、胡行教授、曹義剛教授等，他們給我提供了一個(gè)良好的科研環(huán)境，在學(xué)習(xí)和科研中給予了巨大的關(guān)心和支持。 E. Rodr?guez, J. Luzuriaga, C. D’Ovidio, and C. Esparza, ‘‘Softening of the fluxline structure in La2xSrxCuO4 measured by a vibrating reed,’’ Phys. Rev. B 42, 10796–10800 (1990).[40] Y. B. Kim, C. F. Hempstead and A. R. Strand, ‘‘Critical persistent currents in hard superconductors,’’ Phys. Rev. Lett. 9, 306–309 (1962).[41]. Brandt E H, 1996 Phys. Rev. B 54 (6) 4246. [42]. Brandt E H, 1998 Phys. Rev. B 58 (10) 6506. [43]. Qin M J, Li G, Liu H K, and Dou S X, Brandt E H, 2002 Phys. Rev B 66 (10) 024516.[44] Raphael B. Kasal, Rubens de Andrade Simulation of Dynamic Levitation Force Taking Flux Creep Into Account , JUNE 2007，21582161[45] . Herrmann, C. Cottevielle,G. Duperray, , T. Verhaege,C. Albrecht, ,“Cryogenic load calculation on high current lead,” Cryogenics, vol. 33, pp. 555–562, 1993.[46] T. Rettelbach and G. J. Schimitz, “3D simulation of temperature, electric field and current density evolution in superconducting ponents,” Superconductor Science and Technology,–653,2003.[47] J. Grundmann, M. Lindmayer, R. Rockelein, and W. Schmidt, “Simulation of HTS switching with the finite element analysis program ANSYS,” Superconductor Science and Technology, vol. 16, –565, 2003.[48] 楊萬(wàn)民，周廉，馮勇等，Effect of grainalignment on the levitation force of meltprocessed YBCO bulk Vol 8 No 7 1999 533538.V. 致謝首先感謝我的導(dǎo)師李平林教授，李老師淵博的學(xué)識(shí)、嚴(yán)謹(jǐn)?shù)膶W(xué)風(fēng)、認(rèn)真的工作態(tài)度和開(kāi)闊的事業(yè)令我敬佩。 E. H. Brandt, ibid. 54, 4246 (1996).[26] E. H. Brandt, Am. J. Phys. 58, 43 (1990).[27] M. J. Qin, G. Li, H. K. Liu, S. X. Dou, E. H. Brant, Phys. Rew. B 66 024516(2002).[28] Hellman F., Gyorgy E M, Johnson D W, . 1988 Appl. Phys. 63 447。s, and J. S. Mu241。cke, and H. Piel, Physica C 247, 280 (1995).[20] P. Z. Chang, F. C. Moon, J. R. Hull, and T. M. Mulcahy, J. Appl. Phys. 67, 4358 (1990).[21] B. A. Tent et al, 1998 Phys. Rev. B 58, 11761。 N. Koshizuka, F. Ishikawa, H. Nasu, M. Murakami, et al., Phys. C 378 (2001) 11.[7] Wang J J, He C Y, Meng L F, . 2003 . 16 527 533[8] J. R. Hull, E. F. Hilton, T. M. Mulcahy, Z. J. Yang, and A. Lockwood, “Low friction in mixedmu superconducting bearings,’’ J. Appl. Phys. 78(11), 6833–6838 (1995).[9] J. R. Wang, P. X. Zhang, L. Zhou, M. Z. Wu, W. Gawalek, P. Gornert, H. Weh, in: 15th Inter. Conf. on Magnet Technol., Beijing, October 20 24, 1997.[10] F. C. Moon, M. M. Yanoviak, R. Ware. Hysteretic levitation forces in superconducting ceramics [J]. Appl. Phys. Lett., 1988, 52 (18): 15341536. [11] K. Hiroaki, O. Assushi. Measurement and analysis of lateral forces between magnets and highTc superconductors [J]. J. Appl. Phys., 1995, 77 (2): 770778]. [12] M. Masato, O. Terutugu, F. Hiroyuki, et al. Large levitation force due to flux pinning in YBaCuO superconduc