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Tran Dang Thanh,Phan, T. L.,Phung Quoc Thanh,Hoang Nam Nhat,Duong Anh Tuan,Yu, S. C. IEEE 2014 IEEE transactions on magnetics Vol.50 No.6
<P>This paper presents a detailed study on the Co-doping influence on the electrical and magnetotransport properties of La0.7Ca0.3Mn1-xCoxO3(x = 0.09-0.17) prepared by solid-state reaction. Magnetic measurements versus temperature revealed a gradual decrease of the magnetization (M) and Curie temperature (T-C) with increasing Co concentration (x). The T-C values vary from 194 to 159 K as changing x from 0.09 to 0.17, respectively. H/M versus M-2 performances around T-C prove the x = 0.09 sample undergoing a first-order magnetic phase transition (FOMT) while the samples with x >= 0.11 undergo a second-order magnetic phase transition (SOMT). The other with x = 0.10 is considered as a threshold concentration of the FOMT-SOMT transformation. Considering temperature dependences of resistivity, rho(T), in the presence and absence of the magnetic field, the samples (excepting for x = 0.17) exhibit a metal-insulator transition at T (P) = 60-160 K, which shifts toward lower temperatures with increasing x. In the metallic-ferromagnetic region, the rho(T) data are well fitted to a power function rho(T) = rho(0) + rho(2) T-2 + rho(4.5) T-4.5. This indicates electron-electron and electron-magnon scattering processes are dominant at temperatures T < T (P). In addition, the conduction data at temperatures T > theta(D)/2 (theta(D) is the Debye temperature) and T (P) < T < theta(D)/2 obey the small-polaron and variable-range hopping models, respectively. The values of activation energy E-p, and density of states at the Fermi level N(E-F) were accordingly determined. Here, N(E-F) increases while E-p decreases when an external magnetic field is applied. We also have found that N(E-F) increases when materials transfer from the FOMT to the SOMT, and N(E-F) value becomes smallest for the sample having the coexistence of the FOMT and SOMT (i.e., x = 0.10).</P>
Chau Nguyen N.,Anh Le T.,Vu Nguyen H.,Phuc Hoang K. 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.2
Bioassays to evaluate the mortality, virulence and reproduction potentials of four indigenous EPN strains, SPQ16, S-BM12, H-KT3987 and H-CB3452 on insect larvae of mealworm (Tenebrio molitor) and greater wax moth (Galleria mellonella) revealed the highest mortality rates of two insect larvae at the highest inoculation dose of 100 IJs to range from 89 to 100 percent and 94.3–100 percent at 48 h after inoculation, respectively. Virulence was high for all nematode strains, with LC 50 values between 29.6 and 47.3 IJs/insect host. The highest IJ yields were different between nematode strains and insect host, from 66.8 × 10 3 IJs (S-PQ16) to 118.6 × 10 3 IJs (HKT3987) on T. molitor, and from 54.2 × 10 3 IJs (S-BM12) to 163.3 × 10 3 IJs (H-KT3987) on G. mellonella. The culturing cost in terms of food expenditure for rearing insect larvae varied between insect larvae and nematode strains, from 6.76 to 26.63 USD per billion IJs for nematode strains cultured on T. molitor larvae and from 3.54 to 7.81 USD per billion IJs for nematode strains cultured on G. mellonella larvae. The full cost for a nematode product of 2.5 × 10 9 IJs per hectare, produced through in vivo mass culturing, of the most efficient nematode strain, H-KT3987, was 191.3 USD, slightly cheaper than 199.4 USD for the same nematode product produced through in vitro mass culturing.
INDIAN MERCHANTS IN ANCIENT SOUTHEAST ASIA: THE CASE OF ÓC EO – FUNAN
Nguyễn Văn Kim,Doãn Tùng Anh 부경대학교 글로벌지역학연구소 2022 Journal of Global and Area Studies(JGA) Vol.6 No.1
Being considered a trading polity, Funan was known to have established relationships with major regional economic centers and nations. At its height, Funan controlled a variety of valuable resources and dominated the Southeast Asian maritime trade network, which included many trading ports, raw materials production centers, as well as the Isthmus of Kra, the principal link in the East-West trade route. In this, Indians, notably traders and craftsmen, did not only limit their presence to trading with Funan, but had also permanently settled in the Lower Mekong Delta. They were involved in political life, propagating religion, enriching culture, and producing commodities. Indians’ contributions set the commodity standards for Funan’s economy, affecting arts and the current of ideas in Funan, as well as other Southeast Asian states. Together with internal factors, these external factors influenced the transformation of Funan into a regional power.
Magnetoresistance of Si1−xMnx Semiconductor Thin Films Grown by Using Molecular Beam Epitaxy
T. T. Lan Anh,H. K. Lim,B. C. Lee,D. H. Kim,K. J. Baek,D. J. Kim,H. J. Kim,J. H. Kim,Y. E. Ihm 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.1
The magnetoresistance of Si1−xMnx (x = 0.065, 0.076, and 0.113) thin films grown by using molecular beam epitaxy has been studied. The electrical resistivities of Si0.935Mn0.065 and Si0.924Mn0.076 thin films show semiconductor behaviors. The magnetoresistance of Si0.935Mn0.065 and Si0.924Mn0.076 thin films is negative at low temperatures and gradually transits to positive as the temperature increases. The conduction is dominated by variable range hopping, and the negative magnetoresistance is attributed, in part, to spin-dependent scattering. The magnetoresistance of the Si0.887Mn0.113 thin film increases with temperature, revealing metallic characteristics at temperatures below 240 K. The magnetoresistance of the Si0.887Mn0.113 thin film is also negative at low temperatures and positive at 300 K, but the magnetoresistance has a minimum at the Curie temperature of the ferromagnetic SiMn phase. An intriguing anomalous magnetoresistance was also observed at room temperature. The magnetoresistance of Si1−xMnx (x = 0.065, 0.076, and 0.113) thin films grown by using molecular beam epitaxy has been studied. The electrical resistivities of Si0.935Mn0.065 and Si0.924Mn0.076 thin films show semiconductor behaviors. The magnetoresistance of Si0.935Mn0.065 and Si0.924Mn0.076 thin films is negative at low temperatures and gradually transits to positive as the temperature increases. The conduction is dominated by variable range hopping, and the negative magnetoresistance is attributed, in part, to spin-dependent scattering. The magnetoresistance of the Si0.887Mn0.113 thin film increases with temperature, revealing metallic characteristics at temperatures below 240 K. The magnetoresistance of the Si0.887Mn0.113 thin film is also negative at low temperatures and positive at 300 K, but the magnetoresistance has a minimum at the Curie temperature of the ferromagnetic SiMn phase. An intriguing anomalous magnetoresistance was also observed at room temperature.
The Suicide Gene Diphtheria Toxin A Based Therapy in Cancer Treatment
Anh Nguyen.T.Q,정동기 한국발생생물학회 2012 발생과 생식 Vol.16 No.3
Therapeutic cancer is a long lasting and turbulent history accompany with the milestones in surgical intervention, chemotherapy and radiotherapy. In the past decade, however, metastatic cancer still obstinately exists challenging the professional scientist. Beside the major forms of cancer treatment, Diphtheria toxin (DT) which is produced by a pathogenic strain of bacterium Corynebacterium diphtheria to shield themselves against the other dangerous organism,have been researched as a potential candidate to overcome the drawback such as non-specific, non-effect to drug resistant cancer cell and side effects when using chemotherapy and radiotherapy. In the context of suicide gene therapy, the DT expression under controlling of tissue-specific promoter will be targeted in cancer cell but defect in normal cell. The molecular mechanism, characteristic of DT-bases therapy and prominent achievements of preclinical and clinical studies for the past decade are summarized and discussed in this review.