First-Principles Study of the Influence of Zirconium on the Diffusion of Uranium Defects in Uranium Dioxide

Huan Wang,Yu Zou,Zhong Zhang,Kai-Yuan Wang,Huan An,Chang-Yong Zhan,Jun Wang,Jian-Chun Wu 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.8

The migration properties of uranium vacancies and interstitials in zirconium-doped uranium dioxide are studied by using density functional theory (DFT) and the climbing-image nudge elastic band (CI-NEB) method. The strong correlations among uranium $5f$ electrons were described by using a spherically averaged Hubbard parameter. In the model, the zirconium atoms are introduced by replacing the uranium atoms at the nearest and the next nearest neighbor sites along the diffusion path of uranium defects. The doping with zirconium obviously reduces the migration barriers for defects in uranium dioxide. The effect of doping with zirconium on the diffusion of uranium defects decreases with increasing distance between the zirconium dopant and the uranium defects. Further, we investigated the lattice distortion and the electron transfer associated with the migration of uranium defects, and we analyzed the physical origin of the reduction in the migration barriers caused by zirconium doping.

No-Load Power of Disc Refiner in Low Consistency Refining

Huan LIU,Jixian DONG,Xiya GUO,Bo Wang,Qiao Lijie,Chuanwu DUAN,Kai QI,Lingbo Kong 한국펄프·종이공학회 2020 펄프.종이기술 Vol.52 No.2

Disc refiner is the key equipment in pulping and papermaking process, and the no-load power of disc refiner will directly affect the refining efficiency. So the refining efficiency and energy saving of the refining process will be promoted through theoretical and experimental study on it. In this paper, the measurement and the theoretical calculation method of the no-load power of disc refiner in low consistency refining were summarized. And the effects of pulp properties, control parameters and bar parameters of refining plate on no-load power were analyzed. The main research direction of the no-load power of disc refiner was proposed which has a positive significance on energy saving and pulp quality improvements of refining process.

A heat shock cognate 70 gene in the endoparasitoid, Pteromalus puparum, and its expression in relation to thermal stress

( Huan Wang ),( Sheng Zhang Dong ),( Kai Li ),( Cui Hu ),( Gong Yin Ye ) 생화학분자생물학회 2008 BMB Reports Vol.41 No.5

Effect of Pulp Properties on the Power Consumption in Low Consistency Refining

( Huan Liu ),( Jixian Dong ),( Kai Qi ),( Xiya Guo ),( Ying Yan ),( Lijie Qiao ),( Chuanwu Duan ),( Zhiming Zhao ) 한국목재공학회 2020 목재공학 Vol.48 No.6

The power consumption in the low consistency (LC) refining is an important indicator for the optimal control of the process and it is composed of the net power and the no-load power. The refining efficiency and process characterization of LC refining are directly affected by power consumption. In this paper, the effect of pulp consistency and average fiber length on the power consumption and refining efficiency were studied through the LC refining trials conducted by an experimental disc refiner. It is found that the curve of power-gap clearance can be divided into constant power section, power reduction section, and power increase section. And the no-load power and the adjustable domain of loading applied by the refining plates will increase as the increase of pulp consistency, while the increase of net power is larger than that of no-load power which makes the increasing of refining efficiency. Meanwhile, the adjustable domain of loading applied by the refining plates can be slightly improved by increasing the average fiber length, but its effect on the no-load power in the LC refining process can be neglected. The study of power consumption in LC refining is of positive significance for the proper selection of pulp properties in LC refining, in-depth exploration of refining mechanism, and energy consumption reduction in refining.

Methodology of uncertainty analysis prediction based on multi-well data fusion

Huan Jie Zhang,Kai Wei,Alain P. Tchameni,G. Ben-Kane 한국자원공학회 2018 Geosystem engineering Vol.21 No.3

During drilling activities, geological parameters of a well to be drilled (target well) can be predicted within a limited interval based on multi-well data fusion which aims at ensuring a drilling safety, enhancement of drilling efficiency, reduction of drilling cost as well as acquiring accurate measurements in respect to Oil and Gas protection layers. This work presents a method of uncertainty analysis prediction of pressures using fusion data (formation pressures) from adjacent multi-well. The Eaton method, effective stress theory, and mathematical confidence interval were the various methods used to establish the formation pressure matrix of the target well. The results revealed that due to the complexity and variability of the formations, data interpretation errors of the geological parameters were inevitable. Therefore, the probability density distribution function was established through stratigraphy, probability statistics, and information diffusion. Moreover, the real value of the wells’ formation pressure (target well) was within the distribution interval of multi-well data fusion. Hence, the developed method cannot only effectively reduce the interval of geological parameter of the target well but also enhance the accuracy of parameters prediction.

Parametric Design and Performance Characteristic of Isometric Curved Bar Plate Based on SEL and SSL

Huan Liu,Jixian Dong,Chuanwu Duan,Ruifan Yang,Xiya Guo,Bo Wang,Kai Qi,Lijie Qiao,Sha Wang 한국펄프·종이공학회 2019 펄프.종이기술 Vol.51 No.5

Curved bar plate is common used in the pulp refining, but its design method is rather vague due it complex shape. A design method of isometric curved bar plate using two main parameters, the starting point and bar angle of central curve, was proposed in this paper and the calculation of characterization parameters of specific edge load (SEL) and specific surface load (SSL) was described. Isometric curved bar plates designed by two methods, one with fixed starting point and various bar angles and another with fixed bar angle and various starting points, were analyzed by characterization parameters of SEL and SSL. It would be expected to design isometric curved bar plate by the first method and the SEL would be a useful refining intensity to measure it in actual refining, however, the refining characteristics of different isometric curved bar plates should be further studied. The study on the design of isometric curved bar plate would be conductive to the research of curved bar plate and rapid design of it.

Study on Fiber Cutting Performance of Isometric Straight Bar Plate with Different Bar Angle

Huan Liu,Jixian Dong,Xiya Guo,Chong Luo,Xiaohui Tian,Xiaojun Jiang,Sha Wang,Ruifan Yang,Chuanwu Duan,Bo Wang,Kai Qi 한국펄프·종이공학회 2019 펄프.종이기술 Vol.51 No.5

The refining plate is a direct-acting component of refiners in pulping, and the bar profile of it have a major impact on fiber cutting, which affects the paper forming and strength of the formed paper. In this paper, the fiber average length, the fiber length distribution, the original fiber cutting rate and adjacent fiber cutting rate of samples collected in different refining time are used to analyze the fiber cutting mechanism of the isometric straight bar refining plates with different bar angles. The results show that the fiber cutting performance of plates gradually decreases and the limit fiber cutting length of the plate increases with the increase of the bar angle which is opposite to the conclusion predicted by specific edge load (SEL). However, the fiber cutting action of plates is gradually weakened until the average fiber length is reduced to the limit cutting length of plates. Meanwhile, the cutting mechanism of the straight bar plates with different bar angles is different. The larger bar angle of plate, the lower fiber cutting rate and the adjacent cutting rate of which is basically kept constant during refining, while the adjacent cutting rate of smaller bar angle plate on fibers gradually decreases with refining and finally remains constant. The study on the cutting performance of different bar angle plates has positive significance for the selection and design of refining plates for different pulping process.

Study the Thermal Behaviours for Asphalt Concrete Mixed with Basic Oxygen Furnace Slags

( Huan-lin Luo ),( Deng-fong Lin ),( Show-ing Shieh ),( Yi-hong Liu ),( Yu-kai Wang ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-

In Taiwan, the basic oxygen furnace (BOF) slags are characterized as porous material and with better heat insulation than that of the natural aggregates. The BOF slags have been applied to the pavement as parts of the natural aggregate replacement. The asphalt concrete (AC) with the BOF slags replacements were well recognized and performed. In this study, parts of natural aggregates were replaced by the BOF slags in the AC helping resolve the gradual shortage of the natural resources and save energy and reduce the produce of carbon. In this study, parts of the natural aggregates were replaced by the coarse and fine BOF slags in the construction of AC. Because the thermal insulation and heat absorption are different between BOF slags and natural aggregates, the infrared thermal conductivity measuring instrument was applied to obtain the surface temperatures presented as thermal infrared images in AC. Then, the infrared temperature distribution images were obtained by using the image transformation techniques. The results show that the thermal conductivity for the AC containing with fine BOF slag was larger than that for the coarse BOF slag. The BOG slag replacement in AC helped improve the thermal insulation in AC. Moreover, the temperature was more uniformly distributed for AC with the fine BOF slag than that for the coarse BOF slag replacement. However, the coarse BOF slag was better in the preserve of energy for AC than that of the fine BOF slag.

Research of Book Positioning System Based on Wireless Sensor Network

Huan Wang,Kai Wang 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.5

In order to meet the need of book management in smart library and achieve the positioning of perception node for book position, ZigBee wireless smart network technology is adopted to achieve the information interaction of book information and book management, and RFID technology is used to provide communication perception platform for monitoring book node. Least square method and RSSI (Received signal strength indication) are used to achieve the optimized 3d positioning for book node. The simulation result shows that the amount of calculation for the algorithm is small, whose positioning accuracy reaches 1.21%.

Deep Brain Stimulation of the Subthalamic and Pedunculopontine Nucleus in a Patient with Parkinson's Disease

Liu, Huan-Guang,Zhang, Kai,Yang, An-Chao,Zhang, Jian-Guo The Korean Neurosurgical Society 2015 Journal of Korean neurosurgical society Vol.57 No.4

Deep brain stimulation (DBS) of the pedunculopontine nucleus (PPN) is a novel therapy developed to treat Parkinson's disease. We report a patient who underwent bilateral DBS of the PPN and subthalamic nucleus (STN). He suffered from freezing of gait (FOG), bradykinesia, rigidity and mild tremors. The patient underwent bilateral DBS of the PPN and STN. We compared the benefits of PPN-DBS and STN-DBS using motor and gait subscores. The PPN-DBS provided modest improvements in the gait disorder and freezing episodes, while the STN-DBS failed to improve the dominant problems. This special case suggests that PPN-DBS may have a unique role in ameliorating the locomotor symptoms and has the potential to provide improvement in FOG.