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Effect of Water Stress on the Growth and Physiology of Coffee Plants
( Vu,N. T. ),( J. M. Park ),( A. T. Tran ),( T. K. Bui ),( D. C. Vu ),( D. C. Jang ),( I. S. Kim ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2018 강원 농업생명환경연구 Vol.30 No.3
Water stress effects on the growth and physiology of three coffee species, arabica, robusta, and liberica, were investigated. Unlike in plants that had water supply, plant height, leaf length, and leaf width values decreased significantly in arabica and liberica in a water deficit condition but did not statistically differ in robusta coffee plants. The highest values of reduction in growth characteristics of coffee plants under water deficit condition were observed in arabica, but they did not significantly differ from those in robusta or liberica. The highest value of relative water content in a water deficit condition was observed in liberica, but it was similar to that of robusta. The SPAD value and Fv/Fm of all coffee species decreased significantly during the period without irrigation but increased significantly after re-watering. SPAD values of robusta and liberica in a water deficit condition were higher than those of arabica. The highest value of relative ion leakage during drought was observed in arabica. On the other hand, robusta generally appeared to be more vigorous than arabica and liberica, as shown by its relatively lower percentage of wilting plants and higher percentage of recovering plants.
Vu, H.C.,Dwivedi, A.D.,Le, T.T.,Seo, S.H.,Kim, E.J.,Chang, Y.S. Elsevier 2017 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.307 No.-
Graphene oxide has been utilized effectively for the adsorption of heavy metals. Incorporation of graphene oxide with magnetite nanoparticles through co-precipitation enhances separation of a newly designed magnetite graphene oxide by a magnetic field. Considering the instability of magnetite graphene oxide under different water chemistry conditions, we designed encapsulated magnetite graphene oxide inside a non-toxic alginate bead as a high-performance green chemical for the uptake of Cr(VI) and As(V) in water treatment applications (mGO/bead). The alginate, itself revealed low contribution for metal ions uptake, however this could potentially inhibit the aggregation of magnetite graphene oxide powder showing enhanced performance to extract metals from water. Material capacity minimally altered over a range of pH values for As(V), while Cr(VI) uptake varied with pH changes, which were explained by a local pH-controlled mechanism. Induced hydrolysis was facilitated by the release of Fe<SUP>3+</SUP> from Fe<SUP>3+</SUP>-crosslinked mGO/beads, thus enhancing the removal of Cr(VI). For a complex mixture of heavy metals, influence of the presence of co-occurring ions in a mixed contaminant system (Cr(VI), As(V), Cu(II), Cd(II)) revealed an excellent performance (~80-100% removal) by the composite material. The mGO/bead maintained its activity in wastewater and exhibited greater adsorption efficiency for both Cr(VI) and As(V) compared with activated carbon and carbon nanotube. The mGO/beads could be collected and reused for at least 5 cycles without the leaching of core mineral contents. The results indicate the advantages of mGO/beads over the popular adsorbents that can be developed as a versatile material for water treatment.
Magnetic Properties and Magnetic Viscosity of Pr4Fe76Co10B6Nb3Cu1 Nanocomposite Magnet
N. D. The,N. H. Hai,C. X. Huu,H. D. Anh,L. V. Vu,N. Chau,V. V. Hiep 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
The nanocomposite magnet Pr4Fe76Co10B6Nb3Cu1 has been obtainedbynanocrystallizationofa rapidly-quenchedamorphous ake. Thein uenceoftheannealingprocessonthestructuralandthe magnetic properties are investigated. High magnetic hardness was reached with of large coercivity of Hc = 3.65 kOe, a remanent induction of Mr = 12.0 kG, Mr=Ms = 0.79 and maximum energy product (BH)max = 17.6 MGOe at optimal annealing conditions. The multiphase structures of Fe3B as soft phases and of Pr2Fe14B as hard phase were conrmed by X-ray diraction data. The magneticviscosityasafunctionofthereverseeldwasevaluatedforallspecimen. Theresultsshow thatthemagneticviscositycoecientpeaksatacriticalnucleationeld,atwhichthemagnetization reversal of the specimens becomes irreversible.
Effect of Storage Temperature and Duration on Growth and Quality of Tomato Plug Seedlings
( N T Vu ),( S H Kim ),( D C Vu ),( I S Kim ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2015 강원 농업생명환경연구 Vol.27 No.1
The objective of this study was conducted to evaluate effect of storage temperatures (13, 10, 7, 4oC and control (glasshouse condition)) and duration on growth and quality of tomato seedlings. Inhibition of seedling elongation was observed in all low storage temperatures. Plant height and number of leaves of tomato seedlings decreased with decreasing temperature. Leaf chlorophyll value of seedlings in control was lower than that at 13oC temperature, but it was higher than that at 10oC and 7oC temperatures. Chilling injury and curly leaf were observed in seedlings at 10, 7oC temperature after 10 or 20 days in storage, but they were not observed in seedlings at 13oC temperature. The time of expanding leaf and chilling injury index increased with increasing storage duration. Delay flowering time increased with increasing storage duration and decreasing storage temperature. 4oC temperature was not suitable for long-term storage of tomato seedlings. After 10 days in storage, only 37.5% of seedling survival rate was observed at 4oC temperature, but 100% of seedling survival rates were observed at 13oC, 10oC and 7oC temperatures after 10 or 20 days in storage. Although almost growth parameters of tomato seedlings decreased with decreasing temperature after 10 or 20 days in storage, but there was not statistically significant difference between 10 and 7oC temperatures with total root surface area, total root length, and number of root tips. The compactness of tomato seedlings at 13, 10 and 7oC were similar to that in control treatment after 10 days in storage, but it decreased with decreasing storage temperature after 20 days in storage.
Development of Low-Cost Drive System of a Small-Size Electric Vehicles
T.T.Vu,D.T.Lien,T.W.Chun,H.H.Lee,H.G.Kim,E.C Nho 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper develops the low-cost drive system of the small-size electric vehicles (EVs) driven by the brushed dc motor. The power circuit for driving the dc motor is designed by considering both the cost and efficiency. Some MOSFET and diodes at the power converter are connected in parallel for reducing the conduction loss. In order to change smoothly the rotating direction of dc motor, an operating sequence for both the field current and the armature voltage according to the accelerator pedal angle is suggested. Through the simulation studies and experimental results with the low-cost 8-bit AVR, the performances of the proposed methods are verified.
P. N. Son,T. T. Anh,C. D. Vu,V. H. Tan 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Thermal neutron capture cross-sections and resonance integrals for ^(69)Ga and ^(71)Ga were measured by the activation method. The experimental samples with and without a cylindrical Cd-shield case 1 mm in thickness were irradiated in the neutron field of the thermal column facility of Dalat research reactor. The induced activities in the samples were measured by using a high-resolution HPGe detector. Thermal neutron cross-sections for 2200 m/s neutrons and resonance integrals for the ^(69)Ga(n,γ)^(70)Ga and ^(71)Ga(n,γ)^(72)Ga reactions have been obtained relative to the reference values of the ^(197)Au(n,γ)^(198)Au reaction with σ_0 = 98.65 ± 0.09 barn and I_0 = 1550 ± 28 barn. The necessary correction factors for thermal neutron and resonance neutron self-shielding effects were taken into account in the determinations. The present results are discussed and compared with the evaluated data from ENDF/BVII, JEFF 3.0 and JENDL 3.3.
Photonic Crystal Nanocavities for E cient Light Con nement and Emission
Axel Scherer,,T. Yoshie,,M. Lon car,,J. Vu ckovi c,K. Okamoto,D. Deppe 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
When combined with high index contrast slabs in which light can be efficiently guided, microfabricated two-dimensional photonic crystals provide us with the geometries needed to confine and concentrate light into extremely small volumes and to obtain very high field intensities. Fabrication of optical structures has now evolved to a precision which allows us to control light within such etched nanostructures. Sub-wavelength nano-optic cavities can be designed for efficient and flexible control over both emission wavelength and frequency, and nanofabricated optical waveguides can be used for efficient coupling of light between devices. The substantial reduction of the size of optical components leads to their integration in large numbers and the possibility to combine different functionalities on a single chip, much in the same way as electronic components have been integrated for improved multi-functionality of microchips. Here we describe the use of microfabricated periodic structures, photonic crystals, to define functional nano-optic cavities for efficient confinement and emission of light, which leads to the desire for miniaturization of optical devices.