China Zhongyuan Engineering Corporation

Beijing, China

China Zhongyuan Engineering Corporation

Beijing, China

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Hao X.-C.,Chinese Academy of Sciences | Xiong C.,Chinese Academy of Sciences | Liang T.,Chinese Academy of Sciences | Chen B.,Chinese Academy of Sciences | And 3 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2017

Alloy 690 heat-treated by different processes was employed to study the grain growth behavior and the effect of grain size variation on intergranular carbide precipitation and composition of grain boundaries. The results show that the grain growth tendency increases with the increasing solid solution treating temperature, but the aging time has little effect on the grain growth. After thermal treatment (aging), carbides are precipitated at grain boundaries. Intergranular carbides are more continuous and coarse and of strip morphology in the samples with bigger grain size, while the carbides are small, dispersal in the small grain samples. Cr-depleted zone occurs and the Cr, Ni and Fe concentration changes at the grain boundaries. The minimum Cr concentration is higher and the width of Cr-depleted zones is smaller in the samples with small grains than that in the samples with big grains. © 2017, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.


Hou Y.-N.,China Isotope & Radiation Corporation | Hou Y.-N.,China Zhongyuan Engineering Corporation | Xie X.-Q.,China Isotope & Radiation Corporation | Xie X.-Q.,China Zhongyuan Engineering Corporation
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2015

To face the risk of being exposed to high ionizing radiation and the impact of rising purchase costs when applying 241Am-Be neutron source in oil well logging, an alternative solution of replacing241Am-Be with 252Cf neutron source is studied:241Am-Be and 252Cf are compared in terms of pros and cons, and to add a small amount of 252Cf each time on a continuous interval is introduced to maintain the required neutron output for oil-welling logging purpose. © 2015, Editorial Board of Nuclear Electronics & Detection Tech. All right reserved.


Wang Y.,China Agricultural University | Lin C.,China Agricultural University | Li J.,China Zhongyuan Engineering Corporation | Duan N.,China Agricultural University | And 2 more authors.
The Scientific World Journal | Year: 2013

Environmental pollution and energy crisis restrict the development of China, and the utilization of renewable technology is an effective strategy to alleviate the damage. Biogas engineering has rapidly developed attributes to solve environmental problems and create a renewable energy product biogas. In this paper, two different biogas plants' materials were analyzed by emergy method. One of them is a biogas project whose degraded material is feces (BPF system), and the other is the one whose degraded material is corn straw (BPC system). As a result, the ecological-economic values of BPF and BPC are $28,300/yr and $8,100/yr, respectively. Considering currency, environment, and human inputs, both of the biogas projects have the ability of disposing waste and potential for development. The proportion of biogas output is much more than fertilizer output; so, fertilizer utilization should be emphasized in the future. In comparison, BPF is better than BPC in the aspects of ecological-economic benefits, environmental benefits, and sustainability. The reason is the difficulty of corn straw seasonal collection and degradation. Thus it is proposed that BPC should be combined with the other raw materials. © 2013 Yang Wang et al.


Gao J.,Beihang University | He Q.,Beihang University | Zhan Z.,Beihang University | Gao H.,China Zhongyuan Engineering Corporation
ICNSC 2016 - 13th IEEE International Conference on Networking, Sensing and Control | Year: 2016

Considering that the motion law of billiards is complicated, a dynamic model based on fuzzy neural network is proposed to predict the final position of cue ball after stroking and collision. The collision coordinate system is established to descript the cue ball location after colliding with the target ball. Based on the relationship between the system's input and output, the Monte-Carlo method is ado[ted to record the large amounts of data collected by the billiard robot program. Back propagation Neural Network (BPNN) method is used to train the data to establish a fuzzy dynamic model. In the verification test, the billiard robot is able to correctly predict the final position of cue ball after colliding. The statistic result shows that a lower value of the input geometric features is more easily for the robot to learn, which is tallied with the behavior of human beings to play. © 2016 IEEE.


Chen L.-X.,Nanjing University of Aeronautics and Astronautics | Chen L.-X.,Northwest Institute of Nuclear Technology | Zhu L.,Northwest Institute of Nuclear Technology | Ma T.-Y.,Northwest Institute of Nuclear Technology | And 3 more authors.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2012

Using subchannel code PRTHA, some thermal-hydraulic parameters of IHNI-1 reactor were calculated. The fuel element temperature field and the coolant temperature distribution of the core were analyzed, and the calculation results of the power in the beginning of subcooled boiling were presented. The transient characteristics of IHNI-1 reactor were analyzed by using RELAP5 code, and the variation of the transient parameters with reactivity was also calculated. The analysis of the paper indicates that IHNI-1 reactor has the characteristics of inherent safety.


Zhang Z.,China Nuclear Industry Beijing 401 Hospital | Chong Y.,China Zhongyuan Engineering Corporation | Chen X.,China Zhongyuan Engineering Corporation | Jin C.,China Nuclear Industry Beijing 401 Hospital | And 2 more authors.
Applied Radiation and Isotopes | Year: 2015

A prompt gamma neutron activation analysis (PGNAA) system has been recently developed at the 30-kW research reactor In-Hospital Neutron Irradiator (IHNI) in Beijing. Neutrons from the specially designed thermal neutron beam were used. The thermal flux of this beam is 3.08×106 cm-2 s-1 at a full reactor power of 30 kW. The PGNAA system consists of an n-type high-purity germanium (HPGe) detector of 40% efficiency, a digital spectrometer, and a shielding part. For both the detector shielding part and the neutron beam shielding part, the inner layer is composed of 6Li2CO3 powder and the outer layer lead. The boron-10 sensitivity of the PGNAA system is approximately 2.5 cps/ppm. Two calibration curves were produced for the 1-10 ppm and 10-50 ppm samples. The measurement results of the control samples were in accordance with the inductively coupled plasma atomic emission spectroscopy (ICP-AES) results. © 2015 Elsevier Ltd.


PubMed | Beijing Capture Technology Ltd Co., China Nuclear Industry Beijing 401 Hospital and China Zhongyuan Engineering Corporation
Type: | Journal: Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine | Year: 2015

A prompt gamma neutron activation analysis (PGNAA) system has been recently developed at the 30-kW research reactor In-Hospital Neutron Irradiator (IHNI) in Beijing. Neutrons from the specially designed thermal neutron beam were used. The thermal flux of this beam is 3.0810(6) cm(-2) s(-1) at a full reactor power of 30 kW. The PGNAA system consists of an n-type high-purity germanium (HPGe) detector of 40% efficiency, a digital spectrometer, and a shielding part. For both the detector shielding part and the neutron beam shielding part, the inner layer is composed of (6)Li2CO3 powder and the outer layer lead. The boron-10 sensitivity of the PGNAA system is approximately 2.5 cps/ppm. Two calibration curves were produced for the 1-10 ppm and 10-50 ppm samples. The measurement results of the control samples were in accordance with the inductively coupled plasma atomic emission spectroscopy (ICP-AES) results.


Liu Q.,Nanjing University of Technology | Dong J.,Nanjing University of Technology | Liu M.,China Zhongyuan Engineering Corporation
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011 - Proceedings | Year: 2011

Steel-concrete composite wall is a novel composite structure composed of thin sheet steel outer skin filled with light weight concrete. The composite wall panel can be used as bearing member and also as maintenance structural plate, which can satisfy functional requirement of building including bearing capacity, heat insulation and preservation. As a concerned matter in engineering field, investigation progress of unilateral contact buckling of steel skin sheet is presented by summary, analysis and contrast of relevant results. © 2011 IEEE.


Dong J.,Nanjing University of Technology | Liu M.,Nanjing University of Technology | Liu M.,China Zhongyuan Engineering Corporation | Liu Q.,Nanjing University of Technology | Dai B.,Nanjing University of Technology
Jiangsu Daxue Xuebao (Ziran Kexue Ban)/Journal of Jiangsu University (Natural Science Edition) | Year: 2011

In order to get the influence of inner material stiffness on buckling coefficient of steel skin sheet under unilateral contact, the bi-modulus constraint model was adopted to simulate the constraint of inner materials. According to a novel disaplacement function, energy method was used to deduce the buckling coefficient of steel skin sheet by the principle of stationary potential energy. The results show that the buckling coefficient of Kcr is directly proportion to the logarithm of compressive stiffness coefficient of kr1. When kr1 tends to 0, Kcr approaches a constant value and increases with the increasing of adhesive stiffness coefficient kr2. When kr1 tends to ∞, Kcr also tends to be a constant value with remarkable influence by kr2. The result shows that an appropriate increase of adhesive stiffness can significantly increase the buckling coefficient of the steel skin sheet when the compression stiffness stays at a constant value.


Yang M.,Jiangsu University | Wang X.,Jiangsu University | Gao B.,Jiangsu University | Zhang N.,Jiangsu University | Wang J.,China Zhongyuan Engineering Corporation
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2014

The structural mesh and k-ω turbulence model were used to study the unsteady flow characteristic of whole flow field in a centrifugal pump and to analyze the unsteady excitation characteristic under different working conditions. This study focused on the analysis of pressure pulsation at different locations under different working conditions and a hydrodynamic forces on the single blade, discussed the influence factor that induced the radial loading of the single blade under each revolution. It shows that, the blade passing frequency is the dominant frequency both in the pressure pulsation frequency spectrum and the impeller radial force spectrum, while the shaft frequency is the main excited frequency in the radial hydrodynamic force on a single blade. The radial force on the single blade increased with the flow, the force on single blade under low flow rate conditions is nonuniform obviously while it's uniform close to the rated conditions or BEP. By analyzing the unsteady excitation characteristic of the single blade, the phenomenon of jet-wake at the trailing edge close to the tongue can change the blade loading significantly, the radial hydrodynamic forces is sensitive and directly related to the change of the flow structure near the volute tongue. ©, 2014, Editorial Department of Journal of Drainage and Irrigation Machinery Engineering. All right reserved.

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