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Jiafei Geng,Zhanglei He 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.12
Internet of things is a major change in the development of science and technology; it combines the virtual information with the physical world, so that economic activity and social activities are more intelligent, convenient and efficient. In this paper, the author research on the innovation and development strategy of logistics service under the internet of things. The essence of modern logistics is to take the information technology as the core competitiveness, pay attention to the integration of resources and the whole process of logistics optimization, it is the ablest to play the advantages of Internet of things technology applications. The application of communication and network technology in real-time transfer of information, it can realize the logistics operation agility and integration.
A finite-element analysis of the connecting bolts of slewing bearings based on the orthogonal method
Ming Qiu,Jiafei Yan,Binhai Zhao,Long Chen,Yaoxing Bai 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.3
This paper presents an analysis of the main factors affecting the performance of connecting bolts for slewing bearings. For double row four-point contact ball bearings, major factors include the preload, friction coefficient and height of the bushes. First, bolt connection performances with different levels of each factor are calculated with the finite element method (FEM). Then, the calculation results are analyzed with the orthogonal method. The analysis indicates that the preload is the most important factor affecting the bolt connection performance, followed, to a lesser degree, by the height of the bushes. The friction coefficient is the least important factor.
Nan Zhang,Jiafei Lyu,Peng Bai,Xianghai Guo 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Boron isotopic separation was investigated experimentally and theoretically on boron-specific adsorbent, namely pyrocatechol-modified resin (CL-RESIN). The static adsorption results with initial boron concentration of 8.648 g L−1 at 25 °C were well fitted by the pseudo-second-order kinetic model and Henry isotherm model, from which relevant parameters were used for subsequent isotopic separation simulation by Aspen Chromatograph. The maximum static boron isotopic separation factor with CL-RESIN was 1.13 at 25 °C, thus adsorption-based boron isotopic separation in a chromatographic column packing with CL-RESIN was further studied by experiments and simulations. 11B had greater affinity with CL-RESIN in concentrated boric acid solution with dynamic boron isotopic separation factor of 1.15 and enriched 10B was collected in effluent. Simulation of boron isotopic separation was completed, and simulated results were in good agreement with experimental breakthrough curves under the same conditions. Furthermore, the dynamic behaviors of boron isotopic separation were predicted by simulation under different operating conditions. Response surface methodology (RSM) was employed to determine optimized operating conditions in a chromatographic column. Consequently, the optimized operating conditions were achieved with flow rate of 1.24 mL min−1, 44 cm column length, 0.46 cm column diameter and feed concentration of 8.648 g L−1.
Design and fabrication of a non-clogging scaffold composed of semi-permeable membrane
Tan, Shiyi,Gu, Jiafei,Han, Seung Chul,Lee, Dong-Weon,Kang, Kiju Elsevier 2018 Materials & Design Vol.142 No.-
<P><B>Abstract</B></P> <P>In this study, a novel concept of polymer scaffold was proposed based on 3D porous membrane architecture. It had two distinct sub-volumes intertwined with each other but separated by a single continuous smooth semi-permeable membrane. One sub-volume was used for cell culture, while the other served as a perfusion channel. Mass transfer was implemented through the interfacial porous membrane. Consequently, this scaffold was expected to be completely free from clogging problem due to growing tissue. The sample scaffolds of poly <SMALL>L</SMALL>-lactic acid (PLLA) was fabricated based on 3D UV photo-lithography and porogen leaching technique, which provided a P-surface-like architecture composed of porous membrane having smooth and fine texture with considerably high porosity. Despite high overall porosity of approximately 97%, these scaffolds had strengths and Young's moduli appropriate for regeneration of bones or cartilages. Wettability and permeability of polydopamine-coated PLLA porous membrane were sufficiently high.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A 3D polymer membrane architecture was proposed as a novel concept of bio scaffold. </LI> <LI> It had two sub-volumes that were intertwined but separated by a semi-permeable membrane. </LI> <LI> One sub-volume was used for cell culture, while the other served as a perfusion channel. </LI> <LI> Mass transfer was implemented through the interfacial semi-permeable membrane. </LI> <LI> Despite very high porosity, its strength & modulus was appropriate for bones or cartilages. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Yi Zhang,Weiwei Jian,Yangchun Zhan,Yongchen Song,Mingjun Yang,Jiafei Zhao,Yu Liu,Weiguo Liu,Yong Shen 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.1
Densities of CO2+Dagang - formation brine solution were measured by a magnetic suspension balance(MSB) in the pressure range from (10 to 18) MPa, at the temperatures from (313.15 to 363.15) K and CO2 mass frac-tions at 0, 0.0101, 0.0198 and 0.0299. The experimental results revealed that the solution densities increased linearlywith the increasing pressure and CO2 concentration, while decreasing with the increasing temperatures in the experi-mental range. When the temperature increased from (313.15 to 363.15) K, the slopes of the densities versus (vs.) CO2mass fractions decreased from (0.193 to 0.106) g·cm−3. A correlation equation was developed based on thermody-namic theory and experimental data. The absolute average deviation between the correlation equation and the experi-mental data was 0.05%, and the maximum deviation was 0.37% for the density of CO2+water/brine solution in com-mon geological storage conditions. According to the density of CO2 - free brine and apparent molar volume of CO2 inbrine, the equal density temperature (Te) of CO2+Dagang brine solution was obtained at 464.67 K when pressure is10MPa, which means that the density of brine dissolved with CO2 will be less than that of CO2-free brine when thetemperature is higher than 464.67 K at 10MPa. In this work the formation temperature of the Dagang oilfield reser-voir is from 313.15 K to 363.15 K, which is lower than the equal density temperature. Therefore, the safety of CO2 stor-age in Dagang oilfield reservoir can be guaranteed.