http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Yu Huang,Houbin Li,Xiongzhi Zhang,Kaiqiao Fu,Chi Huang,Shiju Yuan 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-
In the present study, a series of cationic spherical polyelectrolyte brushes (CSPB), consisting of a silicacore and a shell of copolymer of acrylamide (AM) and [2-(methacryloyloxy)ethyl] trimethylammoniumchloride (METAC), were synthesized. Then a dual-component system which was composed of CSPB andanionic polyacrylamide (APAM) was used to improve the retention and drainage properties of bleachedeucalyptus kraft pulp and precipitated calcium carbonate (PCC). Comparative researches about retentionand drainage properties between CSPB/APAM system and cationic starch/APAM system wereundertaken as well. Results showed that further improvement in first-pass retention (FPR) of pulp,FPR of PCC and drainage time could be achieved by CSPB/APAM system. It was also found that increase ofshear intensity led to a decrease in retention efficiency, while it had no significant influence on drainagetime of pulp. However, due to the symmetrical or quasi-symmetrical spherical brush structure, CSPB stillshowed better retention efficiency than cationic starch under different turbulent conditions. Furthermore, the flocculation mechanism of the CSPB/APAM dual-component system was proposedin the paper.
Feng Ding,Shuwei Zhang,Houbin Chen,Hongxiang Peng,Jiang Lu,Xinhua He,Jiechun Pan 한국유전학회 2018 Genes & Genomics Vol.40 No.12
Litchi (Litchi chinensis Sonn.) is an important subtropical fruit crop with high commercial value due to its high nutritional values and favorable tastes. However, irregular bearing attributed to unstable flowering is a major ongoing problem for litchi producers. Previous studies indicate that low-temperature is a key factor in litchi floral induction. In order to reveal the genetic and molecular mechanisms underlying the reproductive process in litchi, we had analyzed the transcriptome of buds before and after low-temperature induction using RNA-seq technology. A key flower bud differentiation associated gene, a homologue of FLORICAULA/LEAFY, was identified and named LcLFY (GenBank Accession No. KF008435). The cDNA sequence of LcLFY encodes a putative protein of 388 amino acids. To gain insight into the role of LcLFY, the temporal expression level of this gene was measured by real-time RT-PCR. LcLFY was highly expressed in flower buds and its expression correlated with the floral developmental stage. Heterologous expression of LcLFY in transgenic tobacco plants induced precocious flowering. Meantime, we investigated the sub-cellular localization of LcLFY. The LcLFY-Green fluorescent protein (GFP) fusion protein was found in the nucleus. The results suggest that LcLFY plays a pivotal role as a transcription factor in controlling the transition to flowering and in the development of floral organs in litchi.
Ultra-High Damping Capacity of Oxide Reinforced Magnesium Matrix Composites by In Situ Synthesis
Diqing Wan,Jiajun Hu,Houbin Wang,Yinglin Hu,Lili Li 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
In this work, in situ oxidation and particle-dispersed methods are successfully used to prepare novel oxide/Mg compositeswith ultra-high damping capacity starting from pure Mg as the matrix. Successful incorporation of the MgO particles into theMg matrix is experimentally demonstrated, and the role of the oxide in enhancing the damping capacities of the compositesis examined in detail. The increased damping capacity of the composites with respect to the pure magnesium is attributedto an increased dislocation density and the introduction of interface damping. In the temperature-dependent damping tests,two damping peaks P1and P2were found. The P1peak is considered to be related to the interaction between dislocations andimpurity atoms or vacancies. The P2peak is considered to be caused by the grain boundaries sliding.
Effect of the Secondary Phase on Mechanical and Damping Properties of Mg–Zn–Y–Si Alloy
Wan Diqing,Wang Houbin,Hu Jiajun,Hu Yinglin,Wang Linsen,Fang Kangjin 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
The Mg–Zn–Y–Si alloy containing the secondary phase is designed by conventional casting. The Mg2Siphase with differentvolume fractions is obtained by controlling the content of Si (mass fraction: 0%, 0.3%, 1.0%, 3.0%). The effects of Mg2Siphase and LPSO phase on the mechanical properties and damping properties of the alloys are investigated. The results showthat due to the addition of Si, the grain of the alloy is refined, and the intergranular secondary phase Mg2Siphase is created.In addition, the addition of Si also causes the bulk LPSO phase inherent in the matrix to transform into a thin-strip LPSOphase, which greatly improves the mechanical properties of the alloys. The damping properties of the alloys have also beenimproved due to the new internal friction mechanisms in the alloy. Therefore, the overall performance of mechanical anddamping of the alloy is greatly improved.
Anelastic and Microplastic Damping of an Mg–Zn–Y–Al Alloy
Diqing Wan,Jiajun Hu,Yinglin Hu,Houbin Wang 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.1
In this study, the Mg97Zn1Y2–Al alloy was selected as a high damping material, anelastic and microplastic damping wereanalyzed by studying strain amplitude-dependent damping curves of the alloy. The C1and C2values of the Granato–Lücke(G–L) model, the theoretical basis of anelastic damping, can be calculated for each alloy, then, the corresponding numbersof strong and weak pinners are deduced. However, since the occurrence of microplastic damping in a high strain amplitudecannot be explained by the G–L model, a new microplastic damping theory was introduced, by comparing the activationvolume of the material dislocation slip, the microplastic damping capacity of the Mg97Zn1Y2–xwt%Al (x = 0.3, 1, 3) alloysat the microplastic stage are compared. The elastic and plastic deformation of the materials could be sensitively reflected bystudying the damping behavior of these two stages
Wang Rongxin,An Aimin,Wen Yongan,Song Houbin 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.3
This article presents a parallel fuzzy PID control strategy on a bulb tubular turbine generator unit for improving the robust control performance. First, the nonlinear model of a bulb tubular turbine generator unit is built in MATLAB/Simulink, and the PID controller parameters are adjusted under rated head. Then, an integrated fuzzy logic PID controller is designed to regulate the hydraulic turbine unit. The eff ectiveness and robustness capability of the proposed controller are evaluated in four independent experiments: starting process, load rejection, frequency tracking and frequency interference. The experimental results validate that the proposed controller can signifi cantly improve the response performance of the speed of hydraulic turbine units. The coeffi cient mutation experiment reveals that the robustness of the system has been improved obviously, and unique contributions of the work can provide a reference for the optimal control of bulb tubular turbine generator units.
Yang Zou,Tao Zhang,Guannan Wang,Mengwen Zhou,Yabo Xiong,Shaoyun Huang,Houbin Li,Xinghai Liu 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
3,3,7,7-tetrakis(difluoroamino) octahydro-1,5-dinitro-1,5-diazocine (HNFX) is a high-density energeticoxidizer with four difluoroamino groups (-NF2). In this study, 1,5-ditosyl-1,5-diazocane-3,7-dione, as animportant intermediate for synthesis of HNFX, was successfully synthesized using Swern oxidation in atraditional batch reactor and a continuousflow microreactor, respectively. 1,5-dotosyl-1,5-diazocane-3,7-dione was characterized by HPLC, FTIR, 1H NMR, 13C NMR, Mass spectrometry, and X-ray crystaldiffraction. Compared with the traditional batch reactor, the microreactor showed several advantages,including less reaction time, milder reaction temperature, higher yield and selectivity for 1,5-ditosyl-1,5-diazocane-3,7-dione. Moreover, the microreactor could ensure the safer and large-scale industrialproduction of 1,5-ditosyl-1,5-diazocane-3,7-dione. However, some solids produced in Swern oxidationwhich might block the channels (diameter of 0.3 mm) in the microreactor. To overcome the challenges,the experimental device was modified to suit for Swern oxidation, contributing to wider application ofthe microreactor. Besides, response surface methodology (RSM) was introduced and an appropriatemathematical model was built to optimize experimental conditions. The optimum experimentalparameters were recommended as 7.8 C for the reaction temperature, 7.7 mL/min for theflow rate, and6% for the concentration of oxalyl chloride. The actual yield of 1,5-ditosyl-1,5-diazocane-3,7-dione was89.7%, which was in great agreement with the highest predicted yield (90.1%).
Yifu Zhang,Meijuan Fan,Fei Niu,Weibing Wu,Chi Huang,Xinghai Liu,Houbin Li,Xin Liu 한국물리학회 2012 Current Applied Physics Vol.12 No.3
Belt-like VO2(M) with a rectangular cross section was first synthesized by the irreversible transformation of VO2(A) at the elevated temperatures under the inert atmosphere to the best of our knowledge. The asobtained samples were characterized by a combination of techniques including XRD, SEM and TEM. The processes of converting VO2(A) to VO2(M) were briefly discussed. The as-obtained VO2(M) has belt-like morphology with a rectangular cross section with typical lengths up to several tens of micrometers,widths ranging from tens of nanometers to several micrometers, and thicknesses about 60e150 nm. The morphology and size of the VO2(M) were dependent on that of the precursor VO2(A). The phase transition properties of VO2(M) were investigated by DSC, indicating that it exhibited a strong phase transition at 67.9 ℃ in the heating cycle and 61.1 ℃ in the cooling cycle. Furthermore, the optical switching property of VO2(M) was studied by the variable-temperature infrared spectra, and it was found that the as-obtained VO2(M) could be used as the optical switch.