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Chau, MinhThuyen,Luo, An,Shuai, Zhikang,Ma, Fujun,Xie, Ning,Chau, VanBao The Korean Institute of Power Electronics 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.5
This paper analyses the mathematical model and control strategies of a Hybrid Active Power Filter with Injection Circuit (IHAPF). The control strategy based on the load harmonic current detection is selected. A novel control method for a IHAPF, which is based on the analyzed control mathematical model, is proposed. It consists of two closed-control loops. The upper closed-control loop consists of a single fuzzy logic controller and the IHAPF model, while the lower closed-control loop is composed of an Adaptive Network based Fuzzy Inference System (ANFIS) controller, a Neural Generalized Predictive (NGP) regulator and the IHAPF model. The purpose of the lower closed-control loop is to improve the performance of the upper closed-control loop. When compared to other control methods, the simulation and experimental results show that the proposed control method has the advantages of a shorter response time, good online control and very effective harmonics reduction.
MinhThuyen Chau,An Luo,Zhikang Shuai,Fujun Ma,Ning Xie,VanBao Chau 전력전자학회 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.5
This paper analyses the mathematical model and control strategies of a Hybrid Active Power Filter with Injection Circuit (IHAPF). The control strategy based on the load harmonic current detection is selected. A novel control method for a IHAPF, which is based on the analyzed control mathematical model, is proposed. It consists of two closed-control loops. The upper closed-control loop consists of a single fuzzy logic controller and the IHAPF model, while the lower closed-control loop is composed of an Adaptive Network based Fuzzy Inference System (ANFIS) controller, a Neural Generalized Predictive (NGP) regulator and the IHAPF model. The purpose of the lower closed-control loop is to improve the performance of the upper closedcontrol loop. When compared to other control methods, the simulation and experimental results show that the proposed control method has the advantages of a shorter response time, good online control and very effective harmonics reduction.
Chau, N.,The, N.D.,Hoa, N.Q.,Huu, C.X.,Tho, N.D.,Yu, S.-C. Elsevier 2007 Materials science & engineering. properties, micro Vol.449 No.-
<P><B>Abstract</B></P><P>A large number of amorphous ribbons based on Finemet have been prepared by rapid quenching on a single copper wheel with linear speed of <I>v</I>=25–30m/s. The ribbons are 20–25μm thick and 6–8mm wide. All as-cast samples are amorphous. Two criteria producing the colossal magnetocaloric effect (CMCE) in magnetic materials working as magnetic refrigerants are high saturation magnetization and sharp ferromagnetic–paramagnetic phase transition. The Fe-based amorphous ribbons fit these cretia. Thermomagnetic curves as well as isothermal magnetization curves around the Curie temperature of all the studied samples have been determined. The results show that the magnetic entropy change, |Δ<I>S</I><SUB>m</SUB>|, belongs to a class of materials with CMCE and the |Δ<I>S</I><SUB>m</SUB>|<SUB>max</SUB> values have been obtained at a moderately low magnetic field change of 1.35T, moreover |Δ<I>S</I><SUB>m</SUB>|<SUB>max</SUB> occurred at quite high temperature.</P>
History and present state of Vietnamese traditional medicine
Chau, Hoang-Bao 경희대학교 동서의학연구소 1989 INTERNATIONAL SYMPOSIUM ON EAST-WEST MEDICINE Vol.1989 No.3
Vietnam has a millienial traditional medicine. Under the reign of the HUNG kings(2879-257 BC) and of AN DUONG VUONG(257-179 BC) our ancestors found meals utilized as materia medica and medicinal plants. During the period of struggle for independence and liberty under the Chinese domination(179 BC-938 AB) the Chinese mandarins brought Chinese medicine with them in Vietnam. There was also exchange of midicines between Vietnam and China. Under the indenpendent reigns of Vietnam(938-1884) Vietnamese traditional medicine developed with the integration of Vietnamese and Chinese medicines. TUE TINH was a famous physician of the 14the century and HAITHUONG LAN ONG, that of the 18th century. During the period of struggle against French colonization Vietnamese traditional medicine has lost its official status and there was importaion of Westem medicine which has taken the official place in the health services of the country. Since 1945 until now, under the new regimes(Democratic Republic and Socialist Republic) thraditional medicine recovers its official place in the health system. From 1955, efforts were made to inherit and develop traditional medicine, to integrate it with Western modern medicine in order to enlarge the abilities of prevention and treatment and to edify a Vietnamese medicine. At present time we have established a system of traditional medicine in the national health network. We have also put into practice the three different methods of medicine and pharmacy : traditional, modern and integrated.
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.
Particle Filtration Efficiency Testing of Sterilization Wrap Masks
Chau, Destiny F.,O'Shaughnessy, Patrick,Schmitz, Michael L. The Korean Society for Preventive Medicine 2021 Journal of Preventive Medicine and Public Health Vol.54 No.1
Objectives: Non-traditional materials are used for mask construction to address personal protective equipment shortages during the coronavirus disease 2019 (COVID-19) pandemic. Reusable masks made from surgical sterilization wrap represent such an innovative approach with social media frequently referring to them as "N95 alternatives." This material was tested for particle filtration efficiency and breathability to clarify what role they might have in infection prevention and control. Methods: A heavyweight, double layer sterilization wrap was tested when new and after 2, 4, 6, and 10 autoclave sterilizing cycles and compared with an approved N95 respirator and a surgical mask via testing procedures using a sodium chloride aerosol for N95 efficiency testing similar to 42 CFR 84.181. Pressure testing to indicate breathability was also conducted. Results: The particle filtration efficiency for the sterilization wrap ranged between 58% to 66%, with similar performance when new and after sterilizing cycles. The N95 respirator and surgical mask performed at 95% and 68% respectively. Pressure drops for the sterilization wrap, N95 and surgical mask were 10.4 mmH2O, 5.9 mmH2O, and 5.1 mmH2O, respectively, well below the National Institute for Occupational Safety and Health limits of 35 mmH2O during initial inhalation and 25 mmH2O during initial exhalation. Conclusions: The sterilization wrap's particle filtration efficiency is much lower than a N95 respirator, but falls within the range of a surgical mask, with acceptable breathability. Performance testing of non-traditional mask materials is crucial to determine potential protection efficacy and for correcting misinterpretation propagated through popular media.