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Ivantsov Ruslan D.,Lin Chun-Rong,Ivanova Oxana S.,Altunin Roman R.,Knyazev Yuriy V.,Molokeev Maxim S.,Zharkov Sergey M.,Chen Ying-Zhen,Lin En-Szu,Chen Bing-Yi,Shestakov Nikolai P.,Edelman Irina S. 한국물리학회 2021 Current Applied Physics Vol.25 No.-
Greigite (Fe3S4) nanoparticles (NPs) were fabricated by the thermal decomposition method using two different surfactants: oleylamine (OLA) and 1-hexadecylamine (HDA). In both cases, the synthesized NPs were characterized as the Fe3S4 nanocrystals with minor inclusions of Fe9S11 phase. FT-IR spectroscopy and thermogravimetric analysis allow concluding about OLA or HDA shells covering magnetic core of NPs. M¨ossbauer spectra has revealed deviations of iron ions distribution among crystal positions from that presented in literature for pure greigite. In accordance with these deviations, the pronounce changes are observed in the magnetic circular dichroism (MCD) spectra which manifest themselves as the spectrum shift to higher energies of electromagnetic waves and redistribution of the MCD maximum intensities. These effects are associated with a change in the density of electronic states in the samples due to the redistribution of iron ions between octahedral and tetrahedral positions in nanocrystals under the influence of surfactants.
Characteristics of Twin-Fluid Micro-Atomizer with Internal Mixing Mechanisms
( Muh Rong Wang ),( K. H. Yang ),( J. S. Chiu ),( Deng Sang Lai ),( T. S. Leu ),( Sheng Chih Shen ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-
The twin-fluid atomizer has three micro channels fabricated via MEMS bulk micro-machining processes, one for the liquid supply and two for introducing the atomization gas. The effects of the length scale of the micro-channels on the atomization performance are investigated. The orifice hydraulic diameter (dH) of the micro atomizer is 45μm. Malvern Insitec RT-Sizer is used to measure the particle size. Results show that the twin-fluid micro-atomizer with internal mixing mechanisms can produce fine spray with Sauter Mean Diameter of 5μm under the gas pressure of 5kg/cm2 and liquid flow rate of 0.1ml/min, a performance better than the micro atomizers reported in the literature. Flow visualization through a microscope shows that the micro-spray is unstable when the two impinging gas flows are staggered inside the atomizer. The micro-spray began to twist by these two impinging gas flows when the gas pressure goes up to 2 kg/cm2. The twisting angle and the cone angle of the spray remain constant when the gas pressure is more than 3 kg/cm2. Significant decrease in the particle size takes place when the gas pressure is more than 4kg/cm2. The atomization efficiency of the twin-fluid micro-atomizer with internal mixing mechanism is several times higher than other type of twin-fluid atomizers.
Nam, J.S.,Rong Kim, A.,Kim, D.M.,Chang, T.S.,Kim, B.S.,Bae, J.W. ELSEVIER 2017 CATALYSIS COMMUNICATIONS Vol.99 No.-
A novel heterogeneous rhodium-incorporated graphitic carbon nitride (Rh-g-C<SUB>3</SUB>N<SUB>4</SUB>) was investigated for a liquid-phase carbonylation of methanol to acetic acid (AA) to overcome disadvantages of the commercialized Rh-based homogeneous catalysts. The heterogeneous Rh-g-C<SUB>3</SUB>N<SUB>4</SUB> catalyst showed a superior catalytic activity in a liquid-phase carbonylation with AA yield above 82% under the reaction conditions of 413K and CO pressure of 4.0MPa, where the initially formed MA intermediate can be easily hydrolyzed to form AA. A higher dispersion of the incorporated rhodium nanoparticles in the g-C<SUB>3</SUB>N<SUB>4</SUB> matrix with a small crystallite size was responsible for a higher catalytic activity with a less leaching degree of active rhodium metals. The novel Rh-g-C<SUB>3</SUB>N<SUB>4</SUB> with rhodium content of 1-3wt% can be a candidate to substitute the commercial homogeneous Rh complex catalyst for AA production by methanol carbonylation.
Park, J. Y.,Han, S. H.,Lee, J. H.,Han, Y. S.,Lee, Y. S.,Rong, X.,McSpadden Gardener, B. B.,Park, H.-S.,Kim, Y. C. American Society for Microbiology 2011 Journal of Bacteriology Vol.193 No.23
<P>Pseudomonas putida B001 is a rhizobacterium that was isolated on the basis of its abilities to grow under low-nutrient conditions and induce systemic resistance against bacterial, fungal, and viral diseases of plants. Here we report the draft genome sequence and automatic annotation of strain B001. Comparison of this sequence to the sequenced genome of P. putida KT2440 points to a subset of gene functions that may be related to the defense-inducing functions of B001.</P>
Femtoliter-scale patterning by high-speed, highly scaled inverse gravure printing.
Kitsomboonloha, Rungrot,Morris, S J S,Rong, Xiaoying,Subramanian, Vivek American Chemical Society 2012 Langmuir Vol.28 No.48
<P>Pattern printing techniques have advanced rapidly in the past decade, driven by their potential applications in printed electronics. Several printing techniques have realized printed features of 10 μm or smaller, but unfortunately, they suffer from disadvantages that prevent their deployment in real applications; in particular, process throughput is a significant concern. Direct gravure printing is promising in this regard. Gravure printing delivers high throughput and has a proven history of being manufacturing worthy. Unfortunately, it suffers from scalability challenges because of limitations in roll manufacturing and limited understanding of the relevant printing mechanisms. Gravure printing involves interactions between the ink, the patterned cylinder master, the doctor blade that wipes excess ink, and the substrate to which the pattern is transferred. As gravure-printed features are scaled, the associated complexities are increased, and a detailed study of the various processes involved is lacking. In this work, we report on various gravure-related fluidic mechanisms using a novel highly scaled inverse direct gravure printer. The printer allows the overall pattern formation process to be studied in detail by separating the entire printing process into three sequential steps: filling, wiping, and transferring. We found that pattern formation by highly scaled gravure printing is governed by the wettability of the ink to the printing plate, doctor blade, and substrate. These individual functions are linked by the apparent capillary number (Ca); the printed volume fraction (φ(p)) of a feature can be constructed by incorporating these basis functions. By relating Ca and φ(p), an optimized operating point can be specified, and the associated limiting phenomena can be identified. We used this relationship to find the optimized ink viscosity and printing speed to achieve printed polymer lines and line spacings as small as 2 μm at printing speeds as high as 1 m/s.</P>
Yong Duck Kim,Jae Gill Yun,Yeong Rong Seo,Chandrakant S. Karigar,Myung Suk Choi 한국원예학회 2015 원예과학기술지 Vol.33 No.1
Effects of mineral salts (N, P, K, Ca<SUP>2+</SUP>, Mg<SUP>2+</SUP>, and Fe<SUP>3+</SUP>) on the shoot growth and metabolite production of tea tree were s tudied u sing in v itro culture techniques. Among mineral s alts, H₂PO₄⁻ was the most important for enhanced growth rate of tea tree, while Mg<SUP>2+</SUP> and Ca<SUP>2+</SUP> did not a ffect plant growth. Remov al o f NH₄⁺ and NO₃ from the culture medium enhanced shoot multiplication compared to other treatments. Metabolite production was variable depending on mineral types and concentration. Removal of Ca<SUP>2+</SUP> decreased the production of caffeine; however, other treatments did not influence its production. Ca<SUP>2+</SUP>, NH₄⁺ and Fe<SUP>3+</SUP> were important factors for catechin production in tea tree. These results can be used as the basis for development of technical soil controls suitable for tea tree cultivation in the future.
Magnetic properties of one-dimensional embedded nickel nanostructures in gold nanowires
S. Ishrat,K. Maaz,Rong Chen,김수현,정명화,김길호 한국물리학회 2012 Current Applied Physics Vol.12 No.1
Magnetic nanostructures of nickel embedded in gold were successfully fabricated by electrochemical deposition in porous alumina templates. Structural characterization of the samples confirmed the formation of pure phase, crystalline multi-segmented AueNieAu nanowires. Magnetic characterization of the wires reveals that ferromagnetism arises as a result of Ni embedded in Au segments. An interesting behavior of coercivity was observed that showed a rapid decrease of coercivity for smaller Ni segments while a monotonic decrease was found for the larger segments. Finally, the saturation magnetization of the wires exhibited a slower increase for smaller Ni segments while a sharp increase was observed for larger Ni segments.
Modeling of flow-induced crystallization of colored polypropylene in injection molding
Rong Zheng,R. I. Tanner,D. Lee Wo,Xi-jun Fan,C. Hadinata,F.S. Costa,P.K. Kennedy,P. Zhu,G. Edward 한국유변학회 2010 Korea-Australia rheology journal Vol.22 No.3
We present a study on flow-induced crystallization of an injection-molded isotactic polypropylene (iPP) mixed with colorant additives. Two types of blue colorants were used in the study: one is the ultramarine Blue composed of Sodium Alumino Sulpho Silicate (UB) and the other is the PV Fast Blue composed of Cu-Phthalocyanine (CuPc). The CuPc colorant exhibits increased nucleation of both quiescent and flow-induced crystallization, and results in more oriented microstructures, causing a high degree of anisotropy in material properties and shrinkage of the injection molded parts. In contrast, the nucleating effect of the UB colorant is negligible under the quiescent condition, but becomes notable in the case of short-term shear treatment at high shear rates. The UB colorant does not significantly increase the degree of anisotropy as compared with the virgin iPP. A flow-induced crystallization kinetic model is used in the numerical simulation for the injection molding process, and predicted the colorant effects as observed in experiments.
Influence of overhead transmission line on grounding impedance measurement of substation
Zeng, Rong,He, Jinliang,Lee, Jaebok,Chang, S.,Tu, Youping,Gao, Yanqing,Zou, Jun,Guan, Zhicheng IEEE 2005 IEEE transactions on power delivery Vol.20 No.2
How to precisely measure the grounding impedance of large-scale substations is a fundamental guarantee for the safe operation of power systems. If the ground wires were connected to the grounding grid, these ground wires would shunt a part of the injected measuring current and allow the measured grounding impedance to be smaller than the actual impedance of the grounding system. Based on an actual 500-kV grounding system, this paper discusses how to analyze the influence of the overhead ground wire on the measured grounding impedance and how to obtain the real grounding impedance of the grounding system. A numerical analysis model considering the grounding system, the transmission lines, towers, and their grounding devices, based on the multilayer soil model analyzed from field test data of apparent soil resistivity, was constructed to analyze the influence of ground wires and tower grounding resistances on grounding impedance, and the general effects of different parameters, such as tower impedance, grounding impedance, and circuits of transmission lines, were analyzed. The real grounding impedance of the substation with connected overhead ground wires was validated, and some useful results have been obtained, based on the field-measured values and numerical analysis.