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Yu-Hsien Lien,Fu-Yao Liu,Jyy-Ning Chen,Yu-Shan Huang,Yu-Hong Wei,Chiyang Yu,Che-Chi Shu 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.2
Water lettuce (Pistia stratiotes) is one of the most well-known aquatic weeds as it causes problems in watercourses all over the world. This invasive species is fast-growing and thus has the potential for its use in preparing growth medium of microorganisms. Toward it, the pretreatment and enzymatic saccharification are positively the decisive processes. But there are other crucial processes, which are usually ignored by researchers. To the best of my knowledge, this presented work is the first time discovering that the juice obtained from water lettuce is valuable. Except for sterilization, no treatment is needed for the water lettuce’s juice and it can be directly served for cell growth. For Escherichia coli, Saccharomyces cerevisiae, Pichia pastoris, Bacillus subtilis, Lactococcus Lactis, Lactobacillus rhamnosus, and Lactobacillus plantarum, the cell density in the broth of water lettuce’s juice as the only carbon source is 10-60% higher than that in LB, YPD, BHI, M17, MRS. We then examined the production of microbial lipid by YM prepared in the juice of water lettuce. In comparison to commercial medium YM broth, the YM with juice caused 84% increase in the production of microbial lipid. A simple process of collecting juice notably increased productivity.
Anomalous doping effect in black phosphorene using first-principles calculations
Yu, Weiyang,Zhu, Zhili,Niu, Chun-Yao,Li, Chong,Cho, Jun-Hyung,Jia, Yu The Royal Society of Chemistry 2015 Physical chemistry chemical physics Vol.17 No.25
<P>Using first-principles density functional theory calculations, we investigate the geometries, electronic structures, and thermodynamic stabilities of substitutionally doped phosphorene sheets with group III, IV, V, and VI elements. We find that the electronic properties of phosphorene are drastically modified by the number of valence electrons in dopant atoms. The dopants with an even number of valence electrons enable the doped phosphorenes to have a metallic feature, while the dopants with an odd number of valence electrons retain a semiconducting feature. This even–odd oscillating behavior is attributed to the peculiar bonding characteristics of phosphorene and the strong hybridization of sp orbitals between dopants and phosphorene. Furthermore, the calculated formation energies of various substitutional dopants in phosphorene show that such doped systems can be thermodynamically stable. These results propose an intriguing route to tune the transport properties of electronic and photoelectronic devices based on phosphorene.</P> <P>Graphic Abstract</P><P>Using first-principles density functional theory calculations, we investigate the geometries, electronic structures, and thermodynamic stabilities of substitutionally doped phosphorene sheets with group III, IV, V, and VI elements. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5cp01732g'> </P>
Robust Output Feedback Consensus of High-order Multi-agent Systems with Nonlinear Uncertainties
Yao Yu,Na Li,Liang Sun,Jian Liu,Changyin Sun 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.2
In this paper, the output feedback consensus problem of high-order multi-agent systems with nonlinear uncertainties is researched by the robust control method. By the dimensional extension of the observation matrix, the consensus control problem is transformed into a stability problem. Then the robust controller is designed by combining the nominal controller and the robust compensator. The nominal controller can obtain desired nominal performance based on the output informations. The robust compensator, which relys on robust signal compensation technology, is order to suppress the nonlinear uncertainties. According to the proposed method, output consensus error can be guaranteed as small as desired. Finally, simulation results are given to illustrate the effectiveness of this control method.
An Analytical Solution for Voltage Stability Studies Incorporating Wind Power
Yu-Zhang Lin,Li-Bao Shi,Liang-Zhong Yao,Yi-Xin Ni,Shi-Yao Qin,Rui-Ming Wang,Jin-Ping Zhang 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.3
Voltage stability is one of the most critical security issues which has not yet been well resolved to date. In this paper, an analytical method called PQ plane analysis with consideration of the reactive power capability of wind turbine generator and the wake effect of wind farm is proposed for voltage stability study. Two voltage stability indices based on the proposed PQ plane analysis method incorporating the uncertainties of load-increasing direction and wind generation are designed and implemented. Cases studies are conducted to investigate the impacts of wind power incorporation with different control modes. Simulation results demonstrate that the constant voltage control based on reactive power capability significantly enhances voltage stability in comparison of the conventional constant power factor control. Some meaningful conclusions are obtained.
Yu‑Yao Chang,Wen‑Bin Young 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2
In this study, the vacuum-bag-only (VBO) process was used to fabricate composite laminates by employing interleavedunidirectional fully impregnated prepreg and dry fiber. The mechanical test results show that the flexure strength, compressionafter impact (CAI) strength and compression before impact (CBI) strength of the carbon fiber composite laminateproduced by this process are about 84%, 72% and 83% of the autoclave composite laminate, respectively. The CAI strengthwith impact energy of 8.5 J retained about 85.4% and 96.4% of the original strength, respectively, for the componentsfabricated by the interleaved layup VBO and conventional autoclave processes. Ultrasonic scanning was performed for the50 × 50 cm2unidirectional carbon fiber composite to identify the void distribution. The results show that the compositesfabricated by interleaved layup VBO process have good quality and low porosity. In the case of glass fiber composites, thehybrid laminate of this process was used to fabricate composite laminate in which unidirectional glass fiber prepregs andbidirectional dry woven glass fiber fabric are interleaved layup. The ultrasonic test results show that the internal pores ofthis composite laminate are very few, and the quality is good. The feasibility of applying the process to different materialsor woven materials was demonstrated.
Yu, Weiyang,Zhu, Zhili,Niu, Chun-Yao,Li, Chong,Cho, Jun-Hyung,Jia, Yu Springer US 2016 NANOSCALE RESEARCH LETTERS Vol.11 No.1
<P>We present first-principles density-functional calculations for the structural, electronic, and magnetic properties of substitutional 3<I>d</I> transition metal (TM) impurities in two-dimensional black and blue phosphorenes. We find that the magnetic properties of such substitutional impurities can be understood in terms of a simple model based on the Hund’s rule. The TM-doped black phosphorenes with Ti, V, Cr, Mn, Fe, and Ni impurities show dilute magnetic semiconductor (DMS) properties while those with Sc and Co impurities show nonmagnetic properties. On the other hand, the TM-doped blue phosphorenes with V, Cr, Mn, and Fe impurities show DMS properties, with Ni impurity showing half-metal properties, whereas Sc- and Co-doped systems show nonmagnetic properties. We identify two different regimes depending on the occupation of the hybridized electronic states of TM and phosphorous atoms: (i) bonding states are completely empty or filled for Sc- and Co-doped black and blue phosphorenes, leading to nonmagnetic; (ii) non-bonding <I>d</I> states are partially occupied for Ti-, V-, Cr-, Mn-, Fe- and Ni-doped black and blue phosphorenes, giving rise to large and localized spin moments. These results provide a new route for the potential applications of dilute magnetic semiconductor and half-metal in spintronic devices by employing black and blue phosphorenes.</P><P><B>PACS numbers:</B> 73.22.-f, 75.50.Pp, 75.75. + a</P>
Effects of Submicron Metakaolin on Hydration and Compressive Strength of Portland Cement Slurry
Yao Yu Wang,Lihua Zhao,Jing Zhao 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.7
Submicron metakaolin (SMK) is an ultrafine aluminosilicate material, which was used for improving properties of cement slurry in this paper. SMK was added to the slurry mix as a partial substitute for Portland cement in proportions of 1%, 3%, 5% and 7%. To explore the influence of SMK on hydration of cement slurry, the heat flow and pH measurement was used to indicate that SMK significantly increased the rate of heat release and total heat release,increase the rate of calcium hydroxide (CH) generation in the pore solution at initial stage of hydration. The hardened specimens at different ages (3 – 28 days) were measured by X–ray diffraction, Differential Thermal Analysis and Compressive strength. The results showed that:SMK displayed pozzolanic effect which reduced CH content and increased the generation of Calcium Silicate Hydrate (C-S-H) gel at later stages of hydration. The compressive strength tests showed that SMK highest increased compressive strength of the slurry by 67% and 19% at 3d and 28d over plain cement slurry. It was concluded that SMK could improve manyproperties of cement slurry and has the use potential on actual projects.