Academic literature on the topic 'Phuong Ha Bui'

Chi, Nguyen Minh, Loi, Vu Van, Thuy, Pham Thi Thu, Anh, Chung Nhu, Phuong, Tran Thi, Bao, Hoang Quoc, Van, Cao Van, Truong, Pham Xuan, Ha, Dinh Thi, Long, Bui Duc, Vuong, Tran Quy, Pham, Duy Long (2024): A bagworm damaging chestnut trees in Vietnam. Ecologica Montenegrina 71: 227-236, DOI: 10.37828/em.2024.71.23, URL: http://dx.doi.org/10.37828/em.2024.71.23

In Vietnam, Cinnamomum cassia is widely utilized not only as a spice but also as a key ingredient in medicine, cosmetics, and the processing industry. The varying climatic conditions across different geographic regions where cinnamon is cultivated significantly influence its quality, often leading to the unintentional mixing of cinnamon from multiple sources. To analyze cinnamon samples, Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR) was employed to measure 139 samples collected from four distinct provinces in Vietnam – Yen Bai, Quang Ninh, Thanh Hoa, and Quang Nam – each representing unique climatic conditions. To enhance data quality, the second derivative Savitzky-Golay smoothing method was applied, improving spectral resolution and reducing noise. Unsupervised chemometric techniques, including Principal Component Analysis (PCA) and Hierarchical Cluster Analysis (HCA), were used to assess classification potential. Additionally, supervised machine learning models, such as Support Vector Machine (SVM), Decision Tree (DT), Random Forest (RF), GausianNB, BernoulliNB, AdaBoost, and Gradient Boosting were combined with PCA results and trained using first derivative Savitzky-Golay smoothed spectra for classification. The results demonstrated that the PCA-SVM model achieved the highest classification accuracy (96.88%) with the second derivative spectra, whereas first derivative and raw data exhibited lower performance. This study underscores that ATR-FTIR spectroscopy, when combined with second-derivative preprocessing and PCA-SVM, provides a simple, rapid, non-destructive, and cost-effective approach for distinguishing cinnamon bark samples based on their geographical origin, offering valuable insights for quality assessment. For citation: Bui Thi Lan Phuong, Hoang Thi Bich, Nguyen Van Phuong, Bui An Duy, Nguyen Duc Phong, Nguyen Manh Son, Pham Gia Bach, Nguyen Thi Cam Ha, Ta Thi Thao, Nguyen Thi Kieu Anh Geographical discriminant and classification of cinnamomum cassia collected in Vietnam using ATR-FTIR coupled with machine learning algorithms. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2025. V. 68. N 7. P. 102-113. DOI: 10.6060/ivkkt.20256807.7246.

In this paper, seismic activity characteristics in the East Sea area was analyzed by authors on the base of the unified earthquake catalog (1900-2017), including 131505 events with magnitude 3 ≤ Mw ≤ 8.4. The seismic intensity in the East Sea during the period 1900-2017 is characterized by the earthquake representative level Mw = 4.7. The strong earthquake activity in the East Sea area clearly shows the regularity in each stage. In the period from 1900 to 2017, the East Sea area has four periods of strong earthquake activity, each stage is nearly 30 years with particular characteristics. The distribution of the maximum earthquake quantities by years has a cyclicity in all four periods. In each stage there are 1-2 strong earthquakes with Mmax ≥ 8.0. The strong earthquakes with Mmax ≥ 7.5 have occurred by a repeatable rule of 3-5 years in all four stages. This allows the prediction of the maximum earthquake repeat cycle of Mmax ≥ 7.5 in the study area is 3-5 years. In other hand, the maximum magnitude values for the East Sea region has assessed by GEV method with several different predict periods (20, 40, 60, 80, 100 years), with predicted probability 80%. We concluded that it is possible that earthquake have Mmax = 8.7 will occur in next 100 years.ReferencesBautista C.B., Bautista M.L.P., Oike K., Wu F.T., Punongbayan R.S., 2001. A new insight on the geometry of subducting slabs in northern Luzon, Philippines. Tectonophysics, 339, 279-310.Bui Cong Que, et al., 2010. Seismic and tsunamis hazard in coastal Viet Nam. Natural Science and Technology Publishing House, 311p.Bui Van Duan, Nguyen Cong Thang, Nguyen Van Vuong, Pham Dinh Nguyen, 2013. The magnitude of the largest possible earthquake in the Muong La-Bac Yen fault zone. J. Sci. of the Earth, 35, 53-59 (in Vietnamese).Cao Dinh Trieu, Pham Nam Hung, 2008. Deep-seated fault zone presents the risk of strong earthquakes in the East and South Vietnam Sea. Scientific Report of the First National Conference on Marine Geology, Ha Long, October, 9-10, 491-497.Hsu Ya-Ju, Yu Shui Ben, Song Teh.-Ru Alex, Bacolcol Teresito, 2012. Plate coupling along the Manila subduction zone between Taiwan and northern Luzon. J. Asian Earth Sci., 51, 98-108.http://www.ioc-tsunami.org/index.php?option=com_oe&task=viewDocumentRecord&docID=16478.http://www.jcomm.info/index.php?option=com_oevàtask=viewDocumentRecordvafdocID=16484.Kirby S., Geist E., Lee W.H., Scholl D., Blakely, R., October 2005. 660 Tsunami source characterization for western Pacific subduction 661 zones: a perliminary report. Report, USGS Tsunami Subduction 662 Source Working Group.Le Duc Anh, Nguyen Hoang., Shakirov RB., Tran T.H., 2017. Geochemistry of late miocene-pleistocene basalts in the Phu Quy island area (East Vietnam Sea): Implication for mantle source feature and melt generation, Vietnam J. Earth Sci., 39, 270-288.Le Huy Minh, Frederic Masson, Alain Bourdiilon, Patrick Lassudrie Duchesne, Rolland Fleury, Jyr-ching Hu, Vu Tuan Hung, Le Truong Thanh, Nguyen Chien Thang, Nguyen Ha Thanh, 2014. GPS data continuously in Vietnam and Southeast Asia. J. Sci. of the Earth, 36, 1-13.Le Van De, 1986. Outline of tectonics of the East Vietnam sea and adjacent areas. Proc. 1st Conf. Geol. Indoch., Ho Chi Minh City, 397-404, Hanoi.Ngo T.L., Tran V.P., 2013. Development of a new algorithm for the separation of seismic and anemone groups from the earthquake list to ensure the independence of events. Journal of Marine Science and Technology, Hanoi, 13(3A), 79-85.Nguyen Dinh Xuyen., et al., 2007. Report on the implementation of the task "Earthquake scenarios for tsunamis in the South China Sea". Institute of Meteorology and Hydrology.Nguyen Hong Phuong, 2015. Estimation of seismic hazard parameters for potential tsunami genic sources in the South China Sea region.Nguyen Hong Phuong, 2001. Probabilistic Seismic Hazard Assessment Along the Southeastern Coast of Vietnam, Natural Hazards, 24, 53-74.Nguyen Hong Phuong, 2004. Earthquake risk map of Vietnam and East Sea. J. Sci. of the Earth, 26, 97-111.Nguyen Hong Phuong, Bui Cong Que, 2012. Investigation of earthquake tsunami sources, capable of affecting Vietnamese coast, Nat Hazards, 64, 311-327.Nguyen Hong Phuong, Pham The Truyen, 2014. Probabilistic Seismic Hazard Assessment for the South Central Vietnam. J. Sci. of the Earth, 36, 451-461.Nguyen Hong Phuong, Pham The Truyen, Nguyen Ta Nam, 2017. Probabilistic Seismic Hazard Assessment for the Tranh River hydropower plant No2 site, Quang nam province, Vietnam J. Earth Sci., 38(2), 188-201.Nguyen Van Luong, Bui Cong Que, Nguyen Van Duong, 2008. Tectonic stresses and modern movements in the crust of the Earth in the East Sea area, Journal of Marine Science and Technology, 46-52.Nguyen Van Luong, Duong Quoc Hung, Bui Thi Thanh and Tong Duy Cuong, 2003. Characteristics of fault systems in the East Sea area. J. Sci. of the Earth., 25, 1-8 (in Vietnamese).Nguyen Van Luong, et al., 2002. Result of establishment of the list of earthquake dynamics in the East Sea area, studies on geology and marine geophysics, VII, Hanoi.Nguyen Van Luong, et al., 2008. Tectonic seismic and geodynamic features of the South China Sea, Proceedings of the 1st National Conference on Marine Geology and Sustainable Development, 9-10, Ha Long, 498-509.Pham Van Thuc and Nguyen Thi Kim Thanh, 2004. Earthquake zone in the South China Sea and coastal areas. Journal of Geology, A series, 285, 11-12.Pham Van Thuc, 2001, Characteristics of tsunamis in the East Sea region of Vietnam. TC and CNN, TI, 2, 52-64.Phan Trong Trinh, Ngo Van Liem, Vy Quoc Hai, John Beavan, Nguyen Van Huong, Hoang Quang Vinh, Bui Van Thom, Nguyen Quang Xuyen, Nguyen Dang Tuc, Dinh Van Thuan, Nguyen Trong Tan, Nguyen Viet Thuan, Le Huy Minh, Bui Thi Thao. Nguyen Huy Thinh, Dinh Van The, Le Minh Tung, Tran Quoc Hung, Nguyen Viet Tien, 2010b. Modern tectonic movement in the East Sea and surrounding areas. Journal of Geology. Series A, 320, 9-10, Hanoi.Phan Trong Trinh, 2006. The Tsunami and December 26, 2004 in the Indian Ocean: A Warning to Vietnam. Journal of Geology, Series A, 293, Hanoi.Phan Trong Trinh, et al., 2010a. Research on the tectonic activity, modern tectonics and geodynamics of the South China Sea as a scientific basis for forecasting the types of catastrophe involved and proposed solutions prevent. KC.09.11/06-10. Institute of Geology, 446p.Phan Trong Trinh, Nguyen Van Huong, Ngo Van Liem, Tran Dinh To, Vy Quoc Hai, Hoang Quang Vinh, Bui Van Thom, Nguyen Quang Xuyen, Nguyen Viet Thuan, Bui Thi Thao, 2011. Geological and geological hazards in Vietnam's sea and nearby. J. Sci. of the Earth, 33, 443-456.Pisarenko V.F., Sornette A., Sornette D. and Rodkin M.V, 2008. New approach to the Characterization of Mmax and of the Tail of the Distribution of Earthquake Magnitudes. Pure and Applied Geophysics, 165, 847-888.Pisarenko V.F, Sornette D. and Rodkin M.V., 2010. Distribution of maximum Earthquake magnitudes in future time intervals: application to the seismicity of Japan (1923-2007). EPS (Earth, Planets and Space), 62, 567-578.Pisarenko V.F., Rodkin M.V, and Rukavishnikova T.A., 2014. Estimation of the Probability of Strongest Seismic Disasters Based on the Extreme Value Theory. Physics of the Solid Earth, 50(3), 311-324.Pisarenko V.F., Rodkin M.V. and et al., 2012. New general quantile approach to the seismic rick assessment application to the Vietnam region. //Proceedings of the International Conference on "Geophysics - Cooperation and Sustainable Development." Science and Technology Publishing House. Hanoi, 161-167.Vu Thanh Ca, 2008. Report on the project to build a map of tsunami warning for coastal areas of Vietnam. Institute of Hydrometeorology and Environment - Ministry of Natural Resources and Environment.Yingchun Liu, Angela Santos, Shuo M. Wang, Yaolin Sh, Hailing Liu, David A. Yuen, 2007. Tsunami hazards along Chinese coast from potential earthquakes in the South China Sea. Phys. Earth Planet. Interiors, 163, 233-244.Zhiguo Xu, 2015. Seismicity and Focal mechanisms in the South China Sea Region and its Tectonic Significances.

This study investigates the factors influencing compulsory tax compliance behavior among digital content creators in Vietnam, a sector experiencing rapid growth amid evolving digital tax regulations. A quantitative approach was used to collect data from Google Forms sent via email and social media, receiving 282 participant responses. The SmartPLS 3.0 software was used to analyze the data collected through the survey process. The results of the study indicate that four factors influence compulsory tax compliance of content creators in Vietnam: Tax fairness, the power of tax authorities, tax awareness, and tax complexity. Policy recommendations are proposed to improve tax administration and support digital content creators to effectively meet their tax obligations in Vietnam’s dynamic digital economy.

Nickel (Ni) laterites are regolith materials derived from ultramafic rocks and play an important role in the world's Ni production. Ni-laterite deposits are the supergene enrichment of Ni formed from the intense chemical and mechanical weathering of ultramafic parental rocks. In Vietnam, the weathering profile containing Ni laterite was first discovered in the Ha Tri massive (Cao Bang). This profile develops on the Ha Tri serpentinized peridotite rocks classified to the Cao Bang mafic-ultramafic complex (North Vietnam) and exhibits thick weathered zone (10 - 15m). This work carried out a detailed study of the weathering profile at the center of Ha Tri massive. Samples from different horizons of the profile were collected and analyzed in detail by XRF, XRD and SEM-EDX methods to establish the relationship between the Ni-rich supergene products and the parental peridotites (lherzolite) rocks in Ha Tri massive. The results show that the saprolite horizon is most Ni-rich in the weathering profile in Ha Tri. In this horizon, Ni-silicate minerals of garnierite group such as pimelite, nepouite and other Mg-Ni silicates have been found. The appearance of minerals of garnierite group is due to the exchange of Mg by Ni during weathering of peridotite minerals, especially olivine, which leads to the enrichment of the supergene Ni. The occurrence of Ni silicates suggests the existence of the supergene Ni ore in the weathering profile of the Ha Tri massive.References Bosio N.J., Hurst J.V., Smith R.L., 1975. Nickelliferousnontronite, a 15 Å garnierite, at Niquelandia, Goias Brazil. Clays Clay Miner., 23, 400-403. Brand N.W., Butt C.R.M., Elias M., 1998. Nickel Laterites: Classification and features. AGSO Journal of Australian Geology & Geophysics, 17(4), 81-88. Bricker O.P., Nesbitt H.W. and Gunter W.D., 1973. The stability of talc. American Mineralogist, 58, 64-72. Brindley G.W. and Hang P.T., 1973. The nature of garnierites. Structures, chemical composition and color characteristics. Clay and Clay Minerals, 21, 27-40. Brindley G.W. and Maksimovic Z., 1974. The nature and nomenclature of hydrous nickel-containing silicates. Clay Minerals, 10, 271-277. Brindley G.W. and Wan H.M., 1975. Composition structures and thermal behavior of nickel containing minerals in thelizardite-ne´pouite series. American Mineralogist, 60, 863-871. Brindley G.W., Bish D.L. and Wan H.M., 1979. Compositions, structures and properties of nickel containing minerals in the kerolite-pimelite series. American Mineralogist, 64, 615-625. Cluzel D. and Vigier B., 2008. Syntectonic mobility of supergene nickel ores from New Caledonia (Southwest Pacific). Evidence from faulted regolith and garnierite veins. Resource Geology, 58, 161-170. Colin F., Nahon D., Trescases J.J., Melfi A.J., 1990. Lateritic weathering of pyroxenites at Niquelandia, Goais, Brazil: The supergene behavior ofnickel: Economic Geology, 85, 1010-1023. Das S.K., Sahoo R.K., Muralidhar J., Nayak B.K., 1999. Mineralogy and geochemistry of profilesthrough lateritic nickel deposits at Kansa,Sukinda, Orissa. Joural of Geoogical. SocietyIndia, 53, 649-668. Decarreau A., Colin F., Herbillon A., Manceau A., Nahon D., Paquet H., Trauth-Badaud D.,Trescases J.J., 1987. Domain segregation in NiFe-Mg-Smectites. Clay Minerals, 35, 1-10. Freyssinet P., Butt C.R.M. and Morris R.C., 2005. Oreforming processes related to lateritic weathering. Economic Geology, 100th aniversary volume, 681-722.Garnier J., Quantin C., Martins E.S., Becquer T., 2006. Solid speciation and availability of chromium in ultramafic soils from Niquelandia, Brazil. Journal of Geochemical Exploration, 88, 206-209. Garnier J., Quantin C., Guimarães E., Becquer T., 2008. Can chromite weathering be a source of Cr in soils? Mineralogy Magazine, 72, 49-53. Gleeson S.A., Butt C.R. and Elias M., 2003. Nickel laterites: A review. SEG Newsletter, 54, 11-18. Gleeson S.A., Butt C.R., Wlias M., 2003. Nickellaterites: a review. SEG Newsletter, Society of Economic Geology, 54. Available from www.segweb.org. Golightly J.P., 1981. Nickeliferous laterite deposits. Economic Geology, 75th Anniversary volume, 710-735. Golightly J.P., 2010. Progress in understanding the evolution of nickel laterite. Society of Economic Geology, In Special Publication, 15, 451-485. Manceau A. and Calas G., 1985. Heterogeneous distribution of nickel in hydrous silicates from New Caledonia ore deposits. American Mineralogist, 70, 549-558. Nguyen Van Pho, 2013. Tropic weathering in Vietnam (in Vietnamese). Pubisher Science and Technology, 365p.Ngo Xuan Thanh, Tran Thanh Hai, Nguyen Hoang, Vu Quang Lan, S. Kwon, Tetsumaru Itaya, M. Santosh, 2014. Backarc mafic-ultramafic magmatism in Northeastern Vietnam and its regional tectonic significance. Journal of Asian Earth Sciences, 90, 45-60.Pelletier B., 1983. Localisation du nickel dans les minerais ‘‘garnieritiques’’ de Nouvelle-Caledonie. Sciences Ge´ologique: Me´moires, 73, 173-183.Pelletier B., 1996. Serpentines in nickel silicate ores from New Caledonia. In Grimsey E.J., and Neuss I. (eds): Nickel ’96, Australasian Institute of Miningand Metallurgy, Melbourne, Publication Series 6(9), 197-205. Proenza J.A., Lewis J.F., Galı´ S., Tauler E., Labrador M., Melgarejo J.C., Longo F. and Bloise G., 2008. Garnierite mineralization from Falcondo Ni-laterite deposit (Dominican Republic). Macla, 9, 197-198. Soler J.M., Cama J., Galı´ S., Mele´ndez W., Ramı´rez, A., andEstanga, J., 2008. Composition and dissolution kinetics ofgarnierite from the Loma de Hierro Ni-laterite deposit,Venezuela. Chemical Geology, 249, 191-202. Springer G., 1974. Compositional and structural variations ingarnierites. The Canadian Mineralogist, 12, 381-388. Springer G., 1976. Falcondoite, nickel analogue of sepiolite. The Canadian Mineralogist, 14, 407-409.Svetlitskaya T.V., Tolstykh N.D., Izokh A.E., Phuong Ngo Thi, 2015. PGE geochemical constraints on the origin of the Ni-Cu-PGE sulfide mineralization in the Suoi Cun intrusion, Cao Bang province, Northeastern Vietnam. Miner Petrol, 109, 161-180.Tran Trong Hoa, Izokh A.E., Polyakov G.V., Borisenko A.S., Tran Tuan Anh, Balykin P.A., Ngo Thi Phuong, Rudnev S.N., Vu Van Van, Bui An Nien, 2008. Permo-Triassic magmatism and metallogeny of Northern Vietnam in relation to the Emeishan plume. Russ. Geol. Geophys., 49, 480-491.Trescases J.J., 1975. L'évolution supergene des roches ultrabasiques en zone tropicale: Formation de gisements nikelifères de Nouvelle Caledonie. Editions ORSTOM, Paris, 259p.Tri T.V., Khuc V. (eds), 2011. Geology and Earth Resources of Vietnam. 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This paper presents some results of rainfall forecast in the monsoon onset period in South Vietnam, with the use of ensemble Kalman filter to assimilate observation data into the initial field of the model. The study of rainfall forecasts are experimented at the time of Southern monsoon outbreaks for 3 years (2005, 2008 and 2009), corresponding to 18 cases. In each case, there are five trials, including satellite wind data assimilation, upper-air sounding data assimilation, mixed data (satellite wind+upper-air sounding data) assimilation and two controlled trials (one single predictive test and one multi-physical ensemble prediction), which is equivalent to 85 forecasts for one trial. Based on the statistical evaluation of 36 samples (18 meteorological stations and 18 trials), the results show that Kalman filter assimilates satellite wind data to forecast well rainfall at 48 hours and 72 hours ranges. With 24 hour forecasting period, upper-air sounding data assimilation and mixed data assimilation experiments predicted better rainfall than non-assimilation tests. The results of the assessment based on the phase prediction indicators also show that the ensemble Kalman filter assimilating satellite wind data and mixed data sets improve the rain forecasting capability of the model at 48 hours and 72 hour ranges, while the upper-air sounding data assimilation test produces satisfactory results at the 72 hour forecast range, and the multi-physical ensemble test predicted good rainfall at 24 hour and 48 hour forecasts. The results of this research initially lead to a new research approach, Kalman Filter Application that assimilates the existing observation data into input data of the model that can improve the quality of rainfall forecast in Southern Vietnam and overall country in general.References Bui Minh Tuan, Nguyen Minh Truong, 2013. 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