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Zhang Q.-W.,China Institute of Atomic Energy | He G.-Z.,China Institute of Atomic Energy | Huang X.,China Institute of Atomic Energy | Huang X.,University of South China | And 3 more authors.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology

The γ ray total absorption BaF2 detector facility is being constructed at China Institute of Atomic Energy, which will be used to accurately measure the neutron capture cross section with the energy of keV. The pulse signals from the detectors were acquired by FlashADC. The energy spectra of 60Co and 137Cs were obtained by integral of waveform area, and their resolutions were as equal as that of traditional electronics method. Three methods (pulse shape discrimination, baseline compensation and time window limit) of digital waveform analysis were applied to effectively reduce the background from α particles and electronics noise. The arrival time of γ ray detected by BaF2 detector was determined by various timing methods. The comparison of FWHM indicates that constant fraction discrimination and digital constant fraction discrimination will be used to measure the neutron energy of capture reaction in online experiment. Source

Sun Z.,University of Wollongong | Sun Z.,Huaneng Shandong Shidao Bay Nuclear Power Co. | Shen J.,University of Wollongong
Journal of Systems and Software

This paper presents a secure storage model named Peer to Cloud and Peer (P2CP). P2CP uses the cloud storage system as a backbone storage system. However, when data transmission occurs, the data nodes, cloud user, and the non-cloud user are involved to complete the transaction all together. The users, typically the client peers, can communicate with each other directly, thus bypassing servers on the cloud. Similarly, cloud servers can communicate with each other in a P2P mode. We also introduce a "hierarchy security" method to guarantee the data security in the proposed P2CP storage model. A key feature of our P2CP is that it has three data transmission tunnels: the cloud-user data transmission tunnel, the clients' data transmission tunnel, and the common data transmission tunnel. Assuming that the P2CP model follows the Poisson process or Little's law, we not only mathematically prove that the speed of P2CP is generally better than that of the pure peer-to-peer (P2P) model, the peer to server and peer (P2SP) model or the pure cloud model, but also testify the results through simulations. Beyond security, we also investigate the performance of another characteristic of usability of the data storage, namely availability, where P2CP is more robust to the failures of peers or servers in the cloud environment. Crown Copyright © 2012 Published by Elsevier Inc. All rights reserved. Source

Zhang Z.-H.,China Academy of Engineering Physics | Mi X.-M.,China Academy of Engineering Physics | Ye L.,Huaneng Shandong Shidao Bay Nuclear Power Co. | Liu Z.-Y.,China Academy of Engineering Physics | And 2 more authors.
Hedongli Gongcheng/Nuclear Power Engineering

The paper introduces the structure of CITP-II tritium production irradiation device, presents the basic process of refueling breeders, studies the device's Solid-Gas phase flow, and computes the flow field parameters, such as pressure, velocity, and buoyancy. The result shows that the reliable structural design and reasonable gas differential pressure could realize the online refueling of irradiation device. Source

Yu W.-W.,Suzhou Nuclear Power Research Institute | Tian Y.,Tianjin University | Chen Y.,Huaneng Shandong Shidao Bay Nuclear Power Co. | Jiang J.-W.,Suzhou Nuclear Power Research Institute | Xue F.,Tsinghua University
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment

In order to investigate the effect of thermal aging on mechanical-hardening behavior of CF8 cast stainless steel for reactor coolant pump (RCP) case material, static tensile experiments of the as-received and thermal aged CF8 steel at room temperature and 350℃ were carried out at a constant strain rate. The results show that the distribution of strain in the gauge length of the specimen is not uniform during tensile. With the increasing thermal aging time, the tensile strength of the steel gradually increases, but the elongation percentage changes reversely. The staged mechanical-hardening behavior of the steel at room temperature and 350℃ is observed and the n-values of each stage increase gradually during the deformation with the increasing thermal aging time, especially for the first stage. ©, 2015, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved. Source

Xu H.,Shanghai University of Electric Power | Xu H.,Shanghai Power Environmental Protection Engineering Technology Research Center | Jin J.,Shanghai University of Electric Power | Sun Y.,Huaneng Shandong Shidao Bay Nuclear Power Co. | And 2 more authors.
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering

Absorption experiments were performed in a bubbling system to study the effects of four different organic amines on the wet flue gas desulfurization, while desorption experiments were conducted in an oil-bath heating device to analyze the desorption effects of the four organic amines. Results show that the desulfurization rate of above organic amines declines with the variation of time following the order below: piperazine > ethylenediamine > DEA > MDEA; whereas their desorption rate at same desorption temperatures increases with the variation of time, showing the desorption performance from strong to weak as follows: MDEA > ethylenediamine > DEA > piperazine. Through calculation with thermodynamic parameters, it is found that the Gibbs free energy of MDEA for absorption of SO2 is less than that of limestone, indicating that MDEA is a better desulfurizing agent, with stronger capability in SO2 absorption than limestone. © 2016, Editorial Department of Chinese Society of Power Engineering. All right reserved. Source

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