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A Concise Design for Irradiating U-10Zr Metallic Fuel at Very Low Burnup
Haibing Guo,Wei Zhou,Yong Sun,Dazhi Qian,Jimin Ma,Jun Leng,Heyong Huo,Shaohua Wang 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.4
In order to investigate the swelling behavior and fuelecladding interaction mechanism ofUe10Zr alloy metallic fuel at very low burnup, an irradiation experiment was conciselydesigned and conducted on the China Mianyang Research Reactor. Two types of irradiationsamples were designed for studying free swelling without restraint and the fuelecladdinginteraction mechanism. A new bonding material, namely, pure aluminum powder, wasused to fill the gap between the fuel slug and sample shell for reducing thermal resistanceand allowing the expansion of the fuel slug. In this paper, the concise irradiation rig designis introduced, and the neutronic and thermalehydraulic analyses, which were carried outmainly using MCNP (Monte Carlo N-Particle) and FLUENT codes, are presented. Out-of-piletests were conducted prior to irradiation to verify the manufacturing quality and hydraulicperformance of the rig. Nondestructive postirradiation examinations using cold neutronradiography technology were conducted to check fuel cladding integrity and swellingbehavior. The results of the preliminary examinations confirmed the safety and effectivenessof the design.
Ke Wei,Qing Ma,Haibing Tang,Xiaoguang Fan,Jian Zhang 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.12
The folding, die underfilling, rib shifting and average grain size of primary equiaxed were investigated using five different unequal thickness billets in transitional region of Ti-alloy multi-rib component under isothermal local loading and compared with integral loading. In terms of the macro deformation, the results show that the material transfers from the second-loading zone into the first-loading zone and the die underfilling decreases with the initial volume of the first-loading zone increasing, which reduces the risk of folding and rib shifting. However, that folding and rib shifting did not appear during the integral loading. Nevertheless, when the initial volume of the first-loading zone reaches a certain value, the die underfilling is aggravated both in local and integral loading. With respect to the microstructure, as the initial volume of the first-loading zone increases, the average grain size is decreased after the first-loading step, but increased after the second-loading step with consideration of one single loading step, which lead to the grain size being barely influenced by different billet volume distribution under both loading steps.
Yaping Sheng,Qigu Huang,Haibing Huang,Mengshan Yu,Xinli Zhang,Lu Cheng,Zhi Liu,Wei Liu,Jianjun Yi,Wantai Yang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
The copolymerization of MMA with ethylene was promoted by metallocene complex in the presence ofinitiator tetra(2,3-epoxy propoxy)silane (Is), reducing agent Zn and cocatalyst MAO, combining freeradical polymerization with coordination polymerization via sequential monomer addition strategy inone-pot to produce 4-arms hydroxy-functionalized PMMA-b-PE. The effects of polymerizationconditions such as temperature, time, ethylene pressure and Al/Ti molar ratio on the polymerizationperformance were investigated. 4-Arms hydroxy-functionalized PMMA-b-PE was obtained by solventextraction and determined by GPC, MALLS, DSC, FT-IR, WAXD and 1H(13C) NMR. The DSC result indicatedthat the 4-arms hydroxy-functionalized PMMA-b-PE had one Tg at 87.0 ℃ and one Tm at 117.0 ℃ whichattributed to Tg of PMMA segment and Tm of PE segment, respectively. The microstructure of 4-armshydroxy-functionalized PMMA-b-PE was further confirmed by WAXD, FT-IR, and 13C NMR analysis. These results demonstrated that the obtained 4-arms block copolymer consisted of PMMA segment andcrystalline PE segment.
Zhi Liu,Xinli Zhang,Haibing Huang,Jianjun Yi,Wei Liu,Weijiao Liu,Hongpeng Zhen,Kejing Gao,Mingge Zhang,Wantai Yang,Qigu Huang 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.6
A new method was presented for preparing (co-)polyethylene with broad molecular weight distribution (MWD) and high molecular weight employed by the novel heterogeneous Ziegler–Natta catalysts via one-pot strategy. The preparation of these catalysts involved the introduction of alkoxy silane compounds as electron donors. The influences of the electron donors structure, as well as polymerization conditions such as temperature, molar ratio of Al/Ti, ethylene pressure and the concentration of 1-hexene in feed on the polymerization performance for ethylene (co-)polymerization, were investigated. The morphology of the catalyst particles was characterized by SEM and Ti content of these catalysts was characterized by ICP. The GPC results showed that the obtained homopolyethylene and ethylene/1-hexene copolymer had the widest molecular weight distribution up to ca 50 when diethoxy-isopropoxy-(t–butoxy)-silane (ED3) was used as internal electron donor. The 13C NMR and FT-IR analysis indicated that these catalysts efficiently catalyzed the copolymerization of ethylene with 1-hexene.
Polymerized Ionic Liquid for the Regulation of Phase Structure of PLA/PCL Blends
Yiyang Zhou,Qiuyue Meng,Ping Wang,Haibing Wei,Pei Xu,Yunsheng Ding 한국고분자학회 2022 Macromolecular Research Vol.30 No.9
Polymerized ionic liquid containing block structure (PIL) has been used as regulator for the phase structure of poly(lactide) (PLA)/poly(ε-caprolactone) (PCL) blends. The phase structure, crystallization, rheology behavior and mechanical properties of PLA/PCL and PLA/PCL/PIL blends were systematically investigated. PIL could be located in PCL phase or at the PLA/PCL interface, enhancing the interaction between polymer components. The crystallization ability of PLA and PCL was simultaneously enhanced with the addition of PIL, since the plasticization effect of ionic moiety and PEO segments in PIL as well as the nucleation effect of PIL-formed ionic cluster. When PIL content was 0.5 wt%, the PLA/PCL/0.5PIL blend system exhibited much better mechanical properties than additivefree PLA/PCL blend. But as PIL contents increased, the significantly change in viscosity ratio between PLA and PCL would lead to obviously change in phase structure of PLA/PCL blend, thus the mechanical properties of the blends would be degraded.
Guaranteeing Deadlines for Inter-Data Center Transfers
Zhang, Hong,Chen, Kai,Bai, Wei,Han, Dongsu,Tian, Chen,Wang, Hao,Guan, Haibing,Zhang, Ming Institute of Electrical and Electronics Engineers, 2017 IEEE/ACM transactions on networking Vol.25 No.1
<P>Inter-data center wide area networks (inter-DC WANs) carry a significant amount of data transfers that require to be completed within certain time periods, or deadlines. However, very little work has been done to guarantee such deadlines. The crux is that the current inter-DC WAN lacks an interface for users to specify their transfer deadlines and a mechanism for provider to ensure the completion while maintaining high WAN utilization. In this paper, we address the problem by introducing a deadline-based network abstraction (DNA) for inter-DC WANs. DNA allows users to explicitly specify the amount of data to be delivered and the deadline by which it has to be completed. The malleability of DNA provides flexibility in resource allocation. Based on this, we develop a system called Amoeba that implements DNA. Our simulations and test bed experiments show that Amoeba, by harnessing DNA's malleability, accommodates 15% more user requests with deadlines, while achieving 60% higher WAN utilization than prior solutions.</P>