HCMUS - Danh sách bài trích tạp chí (The List of Article)
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Duyệt HCMUS - Danh sách bài trích tạp chí (The List of Article) theo Kiểu tài liệu "Giáo trình"
- Ấn phẩmEnhanced degradation of pretilachlor in soil and sediment slurries by inoculation of a mixed bacterial culture under anaerobic condition(Viện Sinh thái và Tài nguyên sinh vật, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2025-09) Ha, Danh Duc; Nguyen, Gia Hien; Nguyen, Thi Dieu Thuy; Nguyen, Thi Kim XuanPretilachlor is a main component of herbicides widely applied to control weeds, causing serious environmental problems. However, its degradation is so slow under anaerobic conditions. This study evaluated the enhancement of pretilachlor degradation using a mixed culture of Pseudomonas sp. Pr1, Proteiniclasticum sp. Pr2 and Paracoccus denitrificans Pr3. The result showed that the degradation using a horizontal-flow anaerobic immobilized biomass bioreactor gave a degradation rate of 3.11 ± 0.31 µM/day after six cycles. Moreover, the inoculation of these bacteria significantly augmented the degradation in slurries of soil collected from a paddy field and sediments from a river. In addition, the determination of pretilachlor degradation in water and soil collected from a paddy field showed that the degradation rates followed an order: a slurry of soil and water (20:80, w/w) > water ≈ soil and water (50:50, w/w). However, adjuvants in an herbicide significantly caused adverse effects on substrate degradation. This study showed the role of isolated bacteria in degradation augmentation in liquid media. It also provided information on the degradation differences in water soil slurry, and soil collected from a paddy field.
- Ấn phẩmNumerical study of thermal lensing and focal shift in 1064 nm fier laser cutting heads 1-6 kW(Viện Vật lý, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2025-12) Do, Thanh TungThermal lensing is an inherent phenomenon in high-power laser optical systems, including fier laser cutting heads, arising from energy absorption–induced thermal and optical variations. This paper presents a numerical study, based on the fiite element method, of thermal lensing effects in a 1064 nm fier laser system operating at 1–6 kW, using fused silica plano-convex lenses with focal lengths of 125–300 mm. The simulations predict a maximum lens temperature of 952 K at 6 kW, leading to focal shifts up to ∆ f = −45 .4 mm for a 300 mm focusing lens, and relative refractive index variations of 74.5–114%. While spot diagram asymmetries appear at higher power levels, these are likely numerical artifacts rather than physical optical deformation. The results highlight the signifiant impact of thermal lensing on focal stability and provide a numerical framework useful for the design and optimization of fier laser cutting heads operating at kilowatt power levels.
- Ấn phẩmThe effect of unparticle in the processes e +e− → γ γ AND γe− → U µe− WHEN THE e + , e− Beams are polarized in unparticle physics(Viện Vật lý, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 2021-07) Dao, Thi Le Thuy; Le, Nhu ThuccccccWe investigate the influence of unparticle physics on the positron-electron (e +e− ) collider via the scalar unparticle (U) and electron (e−) exchange. From computing the contribution of the unparticle exchange to the cross-section (CS) as well as evaluating the dependence of differential cross-section (DCS) on the scattering angle ( θ), we calculate the production of vector unparticle (U µ) in the photon-electron ( γe−) collider in s− and t− channels such as missing energy distribution. Besides, we also found that the polarization of the e+, e− beams also significantly contributes to the CS and DCS of the unparticle production.