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Production Rate Determination for Linear Construction Projects Based on Linear Scheduling Method
Liqiang Liu,Yisheng Liu,Yuanjie Tang 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.4
Traditional scheduling methods such as CPM or PERT have been found to be inappropriate for scheduling the linear construction projects. According to the limitations of Traditional scheduling methods, Linear Scheduling Method (LSM) is proposed specifically for linear construction projects. Aiming at overcoming the limitations of network technology in deciding the production rate of linear construction projects, basing on LSM with its mathematical principle, this paper proposes a new method to decide the production rate of linear construction projects. This paper first analyses the parameters of linear scheduling method and their interrelationships, such as distance interval, time interval, activity, CAP determination of LSM. Then it gives determination method of production rate and the rate float. The determination method can increase the effectiveness of production rate input and output data for the linear projects, which will significantly improve the resource allocation. It also draws the effect of production rate float in the construction schedule control.
Luo, Yongting,Xu, Xiaochao,Liu, Jiwei,Li, Jian,Sun, Yisheng,Liu, Zhen,Liu, Jinzhi,Damme, Els Van,Balzarini, Jan,Bao, Jinku Korean Society for Biochemistry and Molecular Biol 2007 Journal of biochemistry and molecular biology Vol.40 No.3
A novel mannose-binding tuber lectin with in vitro antiproliferative activity towards human cancer cell lines and antiviral activity against HSV-II was isolated from fresh tubers of a traditional Chinese medicinal herb, Typhonium divaricatum (L.) Decne by a combined procedure involving extraction, ammonium sulfate precipitation, ion exchange chromatography on DEAE-SEPHAROSE, CM-SEPHAROSE and gel-filtration on sephacryl S-200. The apparent molecular mass of the purified Typhonium divaricatum lectin (TDL) was 48 kDa. TDL exhibits hemagglutinating activity toward rabbit erythrocytes at 0.95 $\mu$g/ml, and its activity could be strongly inhibited by mannan, ovomucoid, asialofetuin and thyroglobulin. TDL showed antiproliferative activity towards some well established human cancer cell lines, e.g. Pro-01 (56.7 $\pm$ 6.8), Bre-04 (41.5 $\pm$ 4.8), and Lu-04 (11.4 $\pm$ 0.3). The anti-HSV-II activity of TDL was elucidated by testing its HSV-II infection inhibitory activity in Vero cells with $TC_50$ and $EC_50$ of 5.176 mg/ml and 3.054 $\mu$g/ml respectively. The full-length cDNA sequence of TDL was 1145 bp and contained an 813-bp open reading frame (ORF) encoding a 271 amino acid precursor of 29-kDa. Homology analysis showed that TDL had high homology with many other mannose-binding lectins. Secondary and three-dimensional structures analyses showed that TDL is heterotetramer and similar with lectins from mannose-binding lectin superfamily, especially those from family Araceae.
Zhenmin Liu,Junwei Wang,Mao-qing Kang,Ning Yin,Xin-kui Wang,Yisheng Tan,Yulei Zhu 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
MgAl hydrotalcite synthesized via co-precipitation method from magnesium and aluminum nitrateswas calcined to produce Mg4AlO5.5 mixed oxides. The oxides were modified by introducing LiNO3 andapplied to the synthesis of glycerol carbonate from glycerol and dimethyl carbonate. The research resultsindicated that LiNO3/Mg4AlO5.5 was an efficient catalyst for the synthesis of glycerol carbonate. The fullconversion of glycerol and 96.28% yield of glycerol carbonate were obtained after reacting at 80 8C for1.5 h in the presence of LiNO3/Mg4AlO5.5. The structure and properties of the catalysts were studied bymeans of XRD, TGA, BET, CO2-TPD and Hammett indicator method. It was found that the basic strengthand the basicity of the catalysts were enhanced after addition of LiNO3. Over Mg4AlO5.5 oxides, LiNO3 waseasily converted to LiAlO2 which constituted new strong basic sites. Too high basic strength and basicityof catalysts may improve the conversion of glycerol at the cost of GC selectivity reduction.
Current-voltage Characteristics of NdFeAsO0.85F0.15 and NdFeAsO0.85 Superconductors
Yong Liu,YiSheng Chai,Hyeong-Jin Kim,G.R. Stewart,김기훈,Zhi-An Ren,Zhong-Xian Zhao 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2
The vortex phase diagrams of NdFeAsO0.85F0.15 and NdFeAsO0.85 superconductors are determined from an analysis of resistivity and current-voltage (I-V ) measurements in magnetic fields up to 9 T. A vortex glass to liquid transition can be identified only in the oxygen-deficient NdFeAsO0.85, for which the I-V curves can be well scaled onto liquid and glass branches consistent with the vortex glass theory. With increasing magnetic field, the activation energy, U0, deduced from the Arrhenius plots of the resistivity based on the thermally-activated flux-flow model decays more quickly for NdFeAsO0.85F0.15 than for NdFeAsO0.85. Moreover, the irreversibility field, Hirr, of NdFeAsO0.85 increases more rapidly than that of NdFeAsO0.85F0.15 with decreasing temperature. These observations imply strong vortex pinning effects in the oxygen-deficient NdFeAsO0.85, presumably caused by enhanced defects and disorders. We infer that the observation of a vortex glass to liquid transition in NdFeAsO0.85 may be also related to the enhanced defects and disorder in the specimen.
Synthesis of light olefins from syngas over Fe–Mn–V–K catalysts in the slurry phase
Gencun Wang,Yisheng Tan,Kan Zhang,Ping Liu,Haitao Hui 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
Fe–Mn–V–K catalysts for the synthesis of light olefins from CO hydrogenation were prepared by a specially controlled degradation method. The effect of the V content on the structure and the catalytic performance of the catalysts were investigated in a continuously stirred tank slurry reactor. Mo¨ssbauer spectra (MES) results show that the incorporation of V with appropriate contents can improve the dispersion of the a-Fe2O3 phase. CO hydrogenation results indicate that a small addition of V can improve the product distribution. The addition can also increase the selectivity to light olefins by inhibiting the secondary hydrogenation reaction of the initial olefin. The best catalytic performance was obtained at the Fe/Mn/V molar ratio of 3/1/0.2. The total C2–C4 content in all hydrocarbons and O/P in the C2–C4 fraction were 49.15 wt% and 3.95, respectively.
Qingde Zhang,Yizhuo Han,Yisheng Tan,Guangbo Liu,Caihong Yang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The promotional effects of Sm2O3 on Mn-H4SiW12O40/SiO2 for dimethyl ether (DME) direct-oxidation to dimethoxymethane (DMM) were investigated. The results showed that Sm2O3 introduction could significantly improve the activity of Mn-H4SiW12O40/SiO2 for DMM formation, and DMM selectivity was remarkably increased from 36.3% to 60.3% when the Sm2O3 content was 1%. The catalysts were characterized by ICP-AES, XRD, NH3-TPD, Pyridine-IR and XPS. The Sm2O3 introduction enhanced the number of Lewis acid sites and weak acid sites and also increased the amount of Mn4+ species of Mn-H4SiW12O40/SiO2, which is favorable for the formation of DMM.
Conduction Heating of Boron Alloyed Steel in Application for Hot Stamping
Weikang Liang,Yong Liu,Bin Zhu,Minglin Zhou,Yisheng Zhang 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
In traditional hot stamping process, heating of the sheet by radiation heating occupies most of cycle time, which limits the application of hot stamping in automotive industry. Thus a faster heating method has great significance on the hot stamping. The conduction heating overcomes shortage of the radiation heating because of higher heating rate and greater energy efficiency. It attracts increasing attention in the application of heating blanks in hot stamping. In the present study, a movable conduction heating device on die was designed in terms of the Joule’s Law. Heating experiments of boron alloyed steel were performed using the developed device. Heating rate and uniform temperature region were investigated in the non-heat preservation condition (NHPC) and the heat preservation condition (HPC). The results revealed that in the HPC, the heating rate was improved by 13.1 °C/s. In addition, the length of the uniform temperature region was lengthened by 15 mm. It was demonstrated that the HPC was preferred. Furthermore, it was indicated that the mechanical properties of the blanks in uniform temperature region of the conduction heating were also superior to that of the radiation heating.
( Yanling Quan ),( Lin Wang ),( Yisheng Liu ),( Jingxiang Cong ),( Shengquan Xie ),( Xiuhong Wu ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.3
Plackett-Burman (PB) and Box-Behnken (BB) experimental designs were used to optimize fermentation variables for the biotransformation of glycyrrhizin (GL) to monoglucuronyl-glycyrrhetinic acid (MGGA). The PB design was first used to screen the important factors among the medium variables. The steepest ascent method was used to approach the optimum range for each of these factors. The BB design was finally used to analyze the response surfaces of the screened factors for further optimization. The optimized conditions for this system were 0.7 g/L MgSO4·7H2O, 1.19 g/L GL, and cultivation for six days. The biotransformation of GL to MGGA could reach up to 35.72%, which is a good result for this kind of transformation.
Hybrid phase-shifted modulation method for hybrid cascaded H-bridge inverters
Hu, Wenhua,Guo, Jiamin,Liu, Jianfeng,Yuan, Yisheng The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.10
Due to its unreasonable DC voltage distribution, the phase-shifted pulse width modulation (PS-PWM) method cannot be directly applied to equal-ratio and equal-difference hybrid CHB inverters. Thus, these types of inverters lose the double-frequency characteristic of the CHB topology. To preserve this double-frequency characteristic, reduce the switching frequency of the high-voltage cells, and simplify the modulation method. This article proposes an optimized topology for the hybrid CHB inverter by optimizing the distribution of the DC voltage. A hybrid PS-PWM method is also proposed by combing the step-wave modulation method and the PS-PWM method. Theoretical analysis, simulation analysis, and experimental results show that the optimized topology and the hybrid PS-PWM method are both valid and feasible.
Effect of Tensile Deformation of Austenite on the Morphology and Strength of Lath Martensite
Zengmin Shi,Kai liu,Maoqiu Wang,Jie Shi,Han Dong,Jian Pu,Bo Chi,Yisheng Zhang,Li Jian 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.2
A hot-rolled steel, 22SiMn2TiB, was employed to study the effect of austenite deformation on the micro-structure and strength of the subsequently formed lath martensite. It was revealed that the sizes of the mar-tensite packet, block and lath were refined by the tensile deformation of austenite at temperatures above 850 °C. With the increase of the deformation temperature, the packet size increased, whereas the block size decreased. The width of the lath was independent of the prior austenite grain size and the deformation temperature. The refinement of martensite blocks was considered to strengthen the ausformed martensite.