1. Full name: Nguyen Bao Trung                         2. Sex: Male

3. Date of birth: 04/08/1983                                            4. Place of birth: Phu Tho

5. Admission decision number:  No. 4982/QĐ-ĐHKHTN signed 27/11/2013.

6. Changes in academic process:

7. Official thesis title: Anharmonic correlated Debye model and thermodynamic parameters of  face-centered-cubic crystal in XAFS.

8. Major: Theoretical physics and mathematics physics               9. Code: 62.44.01.03

10. Supervisors:            Prof. Dr. Nguyen Van Hung.

11. Summary of the new findings of the thesis:

Based on many-body perturbation approach (MBPA) and quantum statistics, developed anharmonic correlated Debye model (ACDM) and derived analytical expressions for cumulants in anharmonic XAFS to the fourth order.

Applied ACDM to derived expressions for thermodynamic parameters of face-centered-cubic crystal. The result shows a good agreement with other theories in anharmonic XAFS.

Numerical calculation result for Cu and Ni crystals are found to be in good agreement with experiment as well as other theoretical calculations.

12. Paratical applicability, if any: The results of the thesis contribute to enhanced XAFS technique in research structure of materials.

13. Further research directions, if any: Applied ACDM for other structure (bcc, hcp,…) and for doped materials.

14. Thesis-related publications:

- The new findings of the thesis are published in 7 articles, in national scientific journals (3 papers) and international (4 papers).

- Nguyen Van Hung, Nguyen Bao Trung (2006), “Anharmonic correlated Debye model Debye-Waller factor compared to Einstein model result”, VNU. J. Science. 22 (2), pp 40-46.

- Nguyen Van Hung, Nguyen Thi Nu, Nguyen Bao Trung (2008), “Calculation of dispersion relation and real atomic vibration of fcc crystals containing  dopant atom using effective potential”, VNU. J. Science. 24 (4), pp 223-230.

- Nguyen Van Hung, Nguyen Bao Trung, Barbara Kirchner (2010), “Anharmonic correlated Debye model Debye-Waller factors”, Physica B 405, pp 2519-2525.

- Nguyen Van Hung, Nguyen Bao Trung, Duong Duy Son, Tong Sy Tien, Nguyen Ba Duc (2014), “High-order XAFS cumulants of fcc crystals based on anharmonic correlated Debye model and effective potential”, J. Phys. Sci. Appl. 4 (1), pp 43-49.

- Nguyen Van Hung, Nguyen Bao Trung, Nguyen Ba Duc (2015), “Temperature dependence of high-order Expanded XAFS Debye-Waller factors of metallic nickel studied based on Anharmonic correlated Debye model”, J. Mater. Sci. Appl. 1 (2), pp 51-57.

- Nguyen Bao Trung, Nguyen Van Hung, Ha Dang Khoa (2016), “Temperature dependence of high-order expanded anharmonic correlated Debye-Waller factors of metallic copper”, Int. J. Adv. Mater. Research 2 (4), pp 52-58.

- Nguyen Van Hung, Nguyen Bao Trung, Nguyen Cong Toan, Ha Dang Khoa (2017), “Anharmonic correlated Debye model Debye-Waller factors of metallic Copper compared to experiment and to other theories”, VNU. J. Science. 33 (3) 37-44.