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Park, J.,Lee, D.H.,Yoon, S.H.,Vu, T.M.,Yun, J.H.,Keel, S.I. Pergamon Press ; Elsevier Science Ltd 2009 International journal of hydrogen energy Vol.34 No.3
Numerical study is conducted to grasp flame characteristics in H<SUB>2</SUB>/CO syngas counterflow diffusion flames diluted with He and Ar. An effective fuel Lewis number, applicable to premixed burning regime and even to moderately stretched diffusion flames, is suggested through the comparison among fuel Lewis number, effective Lewis number, and effective fuel Lewis number. Flame characteristics with and without the suppression of the diffusivities of H, H<SUB>2</SUB>, and He are compared in order to clarify the important role of preferential diffusion effects through them. It is found that the scarcity of H and He in reaction zone increases flame temperature whereas that of H<SUB>2</SUB> deteriorates flame temperature. Impact of preferential diffusion of H, H<SUB>2</SUB>, and He in flame characteristics is also addressed to reaction pathways for the purpose of displaying chemical effects.
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.
Cost-effective optical fiber daylighting system using modified compound parabolic concentrators
Vu, N.H.,Shin, S. Association for Applied Solar Energy ; Elsevier Sc 2016 SOLAR ENERGY -PHOENIX ARIZONA THEN NEW YORK- Vol.136 No.-
We present a cost-effective optical fiber daylighting system composed of modified compound parabolic concentrators (M-CPC) coupled with plastic optical fibers (POFs). An M-CPC is made by combining two conventional CPCs into one component. Our simulation results demonstrate an optical efficiency of up to 84% when the concentration ratio of the M-CPC is fixed at 100. We have also used a simulation to determine an optimal geometric structure of M-CPCs. Because of the simplicity of the M-CPC structure, a lower-cost mass production process is possible. Our quest for an optimal structure has also shown that M-CPC has high tolerance for input angle of sunlight. The high tolerance allows replacing a highly precise active sun-tracking system with a lower accuracy sun-tracking system as a cost-effective solution. A prototype of M-CPC was fabricated by laser cutting method and preliminary experiments of a sunlight concentrator using M-CPC were performed in outdoor. The good agreement between simulation results and experimental results confirm that M-CPC is designed properly. The overall system cost is also estimated. Some considerations on the economic expansion of the system in terms of efficiency are discussed. The results show that the presented optical fiber daylighting system is a strong candidate for low-price and highly efficient solution for solar energy application to building energy savings.
Certainty equivalence adaptive speed controller for permanent magnet synchronous motor
Vu, N.T.T.,Choi, H.H.,Jung, J.W. Pergamon Press 2012 Mechatronics Vol.22 No.6
This paper designs a robust adaptive speed controller based on the certainty equivalence principle for a permanent magnet synchronous motor (PMSM). The proposed controller quickly adapts to the variation of model parameters and load torque, thus it does not need exact knowledge about system parameters. The proposed control system can guarantee good performance such as a fast transient response, a small steady-state error, and a good tracking capability. The proposed control algorithm is executed by using a TMS320F28335 floating point DSP. The simulation and experimental results are given to verify the effectiveness of the proposed method in the presence of the variation of system parameters and load torque.
Vu, T.K.V.,Sommer, G.S.,Vu, C.C.,Jorgensen, H. Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.2
Livestock production in Vietnam is, as in most Asian countries, increasing rapidly and changing into specialized highly intensified operations. The volume of animal excreta generated exceeds the capacity of the operation land base and cannot be utilized efficiently. As a consequence, there is a loss of plant nutrients from livestock farms that causes environmental pollution. This study carried out a feed and excretion experiment measuring fecal characteristic, daily fecal production, daily nitrogen and phosphorous excretion from grower-finisher pigs fed prevalent rations in Vietnam. Furthermore, equations for assessing the excretion were tested, which can be used in farm models for optimal recycling of manure while focusing on reducing pollution. The results indicated that fecal production and nutrient excretion were affected by the different rations tested. This study showed that five selected equations for predicting excretion from grower-finisher pigs in Danish conditions can also be used with precision in Vietnamese pig farming systems. The equations have been proven valid and can, therefore, be used as a much needed tool for assessing fecal production and nitrogen in excreta on pig farms. The study also showed that about 12% of nitrogen excreted was emitted during housing. Waste water contains more than half of the nitrogen excreted, mainly in ammonium form which has a high potential for gaseous emission.