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Seasonal dynamics of cyanobacteria and eukaryotic phytoplankton in a multiplereservoir recycling irrigation system

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Ecological Processes 2019年第1期8卷 465-475页

作者： Ping kong Patricia Richardson Chuanxue hong Hampton Roads Agricultural Research and Extension Center Virginia Tech1444 Diamond Springs RoadVirginia BeachVA 23455USA

Background:Agricultural runoff recycling systems are manmade aquatic ecosystems of growing significance to global water sustainability,crop health,and *** study investigated the seasonal dynamics of microbial community in a three-reservoir recycling irrigation system with a stepwise water flow and compared with that of an adjacent runoff-free *** water from all production areas was captured in a sedimentation reservoir which overflowed to a transition reservoir then retention reservoir through a *** water was pumped to replenish the reservoirs as needed during growing ***:16S rDNA PCR clone libraries of quarterly water samples from three reservoirs and one stream were sequenced,and 575 operational taxonomic units(OTUs)were identified and assigned to cyanobacteria,eukaryotic phytoplankton,and other *** compared to the stream,three reservoirs consistently had low microbial diversity.A distinct seasonal pattern of microbial community structure was observed for each reservoir and the *** was consistently dominated by other *** reservoir was dominated by cyanobacteria during the summer and fall and eukaryotic phytoplankton during the winter and *** reservoir was dominated by cyanobacteria beginning in the spring but that dominance was altered when water was pumped from the stream from early spring to fall *** reservoir had the greatest shift of microbial community structure,being dominated by other bacteria in the summer,cyanobacteria in the fall,and eukaryotic phytoplankton in the winter and *** temperature and ammonium level were the two most important contributing factors to the seasonality of microbial community in these ***:The three recycling irrigation reservoirs consistently had lower microbial diversity and distinct community structure when compared to the *** reservoirs were typically dominated by cyanobacteria dur

关键词： Bacteria Cyanobacteria Phytoplankton Seasonal dynamics Water recycling Water quality

Microstructure of a Variety of Cokes After Alkali Enrichment

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Journal of Iron and Steel Research International 2013年第7期20卷 45-49页

作者： QI Cheng-lin ZHANG Jian-liang LIU hong-quan kong De-wen WANG xiao-liu State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Sinosteel Furnace Charge Co. Ltd.

It is difficult to distinguish tamping coke and top charging coke by conventional testing methods, such as cold strength, abrasion resistance, reactivity and strength after reaction. Some of tamping coket s properties were even bet-ter than those of top charging coke, hut from practical using effects of blast furnace, tamping coke was not as good as top charging coke. The reaction conditions were featured as high temperature, high alkali condition, intense reac-tion atmosphere and short time. Distribution of porosity in profile, microstructure and slag forming property of ash were analyzed and following conclusions were obtained. After alkali-rich reaction, there were obvious differences be- tween top charging coke and tamping coke in microstructure, The porosityts unevenness of tamping coke was greater than those of top charging coke, and tamping coke was with less and big pores in out space and inner part was dense with more throughout pores. After phase diagram and microstructure analysis, it could he obtained that ash forming characteristics of top charging coke were better than those of tamping coke, and top charging coke＇ s pores were blocked more seriously than those of tamping coke. From analysis of tuyere samples, it could be found that calcium content of ash in coke＇s pores was small and it should belong to coke＇s inherent ash; kalium （wκ =28%） was unusu-ally high in coke. so the situation of high alkali was close to real blast furnace reaction condition.

关键词： coke alkali tamping coke top charging microstructure

LLR calculation for LDPC coded SCBT in 60 GHz WPAN

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Journal of Systems Engineering and Electronics 2010年第5期21卷 734-739页

作者： Lingjun kong Yang xiao Ming Lei Ye Huang Institute of Information Science Beijing Jiaotong University Beijing 100044 E R. China NEC Laboratories NEC Corporation Beijing 100084 P. R. China Communications Technology Laboratories Intel China Research Center Beijing 100080 E R. China

The single-carrier block transmission（SCBT）,a.k.a.,single-carrier frequency-domain equalization（SC-FDE）,is being considered as an option technique for the wireless personal area network（WPAN） operating at 60 *** is found that for residential environment,in non-line-of-sight（NLOS） multi-path channels,the SCBT is much more effective to combat the inter-symbol interference（ISI） compared with orthogonal frequency division multiplexing（OFDM）.Low-density parity-check（LDPC） codes are a class of linear block codes which provide near capacity performance on a large collection of data transmission and storage channels while simultaneously admitting implementable *** facilitate using LDPC codes for SCBT system,a new log-likelihood ratio（LLR） calculation method is proposed based on pilot symbols（PS）.Golay Sequences whose sum autocorrelation has a unique peak and zero sidelobe are used for creating the *** position and length of the PS are not fixed in the data *** simulation results show that the proposed method can significantly improve the LDPC decoding performance in SCBT *** is very promising to support ultra high-data-rate wireless transmission.

关键词： single-carrier block transmission single-carrier frequency-domain equalization low-density parity-check code log-likelihood ratio wireless personal area network.

The complementary graphene growth and etching revealed by large-scale kinetic Monte Carlo simulation

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npj Computational Materials 2021年第1期7卷 117-125页

作者： xiao kong Jianing Zhuang Liyan Zhu Feng Ding Centre for Multidimensional Carbon Materials Institute for Basic ScienceUlsan 44919Korea Institute of Textiles and Clothing Hong Kong Polytechnic University999077 Kowloon Hong KongChina Department of Physics and Jiangsu Key Laboratory of Modern Measurement Technology and Intelligent SystemsHuaiyin Normal University223300 Huai’anChina School of Materials Science and Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea

To fully understand the kinetics of graphene growth,large-scale atomic simulations of graphene islands evolution up to macro sizes(i.e.,graphene islands of a few micrometers or with billions of carbon atoms)during growth and etching is essential,but remains a great *** this paper,we developed a low computational cost large-scale kinetic Monte Carlo(KMC)algorithm,which includes all possible events of carbon attachments and detachments on various edge sites of graphene *** a method allows us to simulate the evolution of graphene islands with sizes up to tens of micrometers during either growth or etching with a single CPU *** this approach and the carefully fitted parameters,we have reproduced the experimentally observed evolution of graphene islands during both growth or etching on Pt(111)surface,and revealed more atomic details of graphene growth and *** on the atomic simulations,we discovered a complementary relationship of graphene growth and etching—the route of graphene island shape evolution during growth is exactly the same as that of the etching of a hole in graphene and that of graphene island etching is exactly same as that of hole *** complementary relation brings us a basic principle to understand the growth and etching of graphene,and other 2D materials from atomic scale to macro size and the KMC algorithm is expected to be further developed into a standard simulation package for investigating the growth mechanism of 2D materials on various substrates.

关键词： sizes complementary island

New Results on H_∞ Control of Linear Systems with Interval Time-Varying Delays

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Journal of Systems Science & Complexity 2015年第2期28卷 327-340页

作者： xiao Shenping CHENG Wubin ZENG hongbing kong Lingshuang Institute of Electrical and Information Engineering Hunan University of Technology

This paper is focused on the H_(∞) control problem for linear systems with interval timevarying *** employing a reciprocally convex combination approach and a delay decomposition approach,some new delay-dependent bounded real lemmas(BRLs) are derived such that the closedloop system is asymptotically stable with a prescribed H_(∞) *** BRLs are then used to solve the H_(∞) controller design by incorporating with the cone complementary *** numerical examples are finally given to show the validity of the proposed method.

关键词： H∞ controllers interval time-varying delay linear matrix inequality (LMI) reciprocally convex approach stability.

Influence of electronic structure on Compton scattering through comparing Cu-Ni alloys with Cu-Ni powder mixtures

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Acta Metallurgica Sinica(English Letters) 2012年第1期25卷 55-64页

作者： Guang LUO Xianquan HU Guangyu xiao Chunyang kong College of Physics and Electronic Engineering Chongqing Normal UniversityChongqing 400047China

The application fields of Compton scattering have been further broadened through the studies of theories and experiments as well as the electronic structure of the scatters. The relationship between the contents of binary alloys （also binary powder mixtures） and the number of Compton scattered photons has been thoroughly examined. The linear expression of the relationship has been obtained approximately according to the Compton scattering theory. And the relationship has been validated well through the Compton scattering experiments with the scatters of Cu-Ni binary alloys or Cu- Ni binary powder mixtures. Furthermore, it is found that the slope of Cu-Ni powder mixture series is steeper than that of Cu-Ni alloy series, and through the pseudopotential plane wave theory of DFT the microscopic principles of Compton scattering of Cu-Ni alloy and Cu-Ni powder mixture series have been discussed and compared with each other. The results show that the electronic structure is the main reason for the difference of the linear slopes, and the line slope of Cu-Ni powder mixtures series is steeper than that of Cu-Ni alloy series.

关键词： Compton scattering Microscopic principle Cu-Ni Line slope

PREDICTION OF PROJECTILE PENETRATION AND PERFORATION BY FINITE CAVITY EXPANSION METHOD WITH THE FREE-SURFACE EFFECT

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Acta Mechanica Solida Sinica 2014年第6期27卷 597-611页

作者： Qin Fang Xiangzhen kong Jian hong Hao Wu PLA University of Science and Technology

With a target treated as the incompressible Tresca and Mohr-Coulomb material, by assuming that cavity expansion produces plastic-elastic and plastic-cracked-elastic response region, the decay function for the free-surface effect is constructed for metal and geological tar- gets, respectively. The forcing function for oblique penetration and perforation is obtained by multiplying the forcing function derived on the basis of infinite target assumption with the de- cay function. Then the projectile is modeled with an explicit transient dynamic finite element code and the target is represented by the forcing function as the pressure boundary condition. This methodology eliminates discretizing the target as well as the need for a complex contact algorithm and is implemented in ABAQUS explicit solver via the user subroutine VDLOAD. It is found that the free-surface effect must be considered in terms of the projectile deformation, residual velocity, projectile trajectory, ricochet limits and critical reverse velocity. The numerical predictions are in good agreement with the available experimental data if the free-surface effect is taken into account.

关键词： penetration perforation finite spherical cavity expansion free-surface effect

EFFECTS OF STATIC ELECTRIC FIELD ON THE FRACTURE BEHAVIOR OF PIEZOELECTRIC CERAMICS

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Acta Mechanica Sinica 2002年第5期18卷 537-550页

作者： Tong-Yi Zhang (Department of Mechanical Engineering,hong kong University of Science and Technology,Clear Water Bay,Kowloon,hong kong,China) Department of Mechanical Engineering Hong Kong University of Science and Technology Kowloon Hong Kong China

The paper gives an overview on experimental observations of the failure behavior of electrically insulating and conducting cracks in piezoelectric ce- *** experiments include the indentation fracture test,the bending test on smooth samples,and the fracture test on pre-notched(or pre-cracked)compact ten- sion *** electrically insulating cracks,the experimental results show a com- plicated fracture behavior under electrical and mechanical *** data are much scattered when a static electric field is applied.A statistically based frac- ture criterion is *** electrically conducting cracks,the experimental results demonstrate that static electric fields can fracture poled and depoled lead zirconate titanate ceramics and that the concepts of fracture mechanics can be used to mea- sure the electrical fracture ***,the electrical fracture toughness is much higher than the mechanical fracture *** highly electrical fracture toughness arises from the greater energy dissipation around the conductive crack tip under purely electric loading,which is impossible under mechanical loading in the brittle ceramics.

关键词： fracture piezoelectric and dielectric ceramics insulating and conducting cracks bending tests indentation fracture tests

Improvement and Implementation of Embedded Fiber Bragg Grating Sensor Signal De-module

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Journal of Harbin Institute of Technology(New Series) 2013年第2期20卷 118-123页

作者： hong-Min Wang Xu-Sheng Wang Chang-hong Jia kong-Qi Li xiao-Fei Hu Hai-Qing Guo College of Automation Harbin University of Science and Technology

This paper focused on high-precision demodulation of wavelength shift of FBG sensor. Fiber tunable F-P filer was used as a demodulation method. 32-bit embedded processor ARM9-S3C2440 chip was used as the main controller and simulated annealing algorithm was realized on ARM to demodulate wavelength signal. Simulation results show that the simulated annealing algorithm is reliable to process analog signals on ARM chip and significant performance is achieved such as saving bandwidth,increasing the amounts of reusable fiber grating sensors in sensor system and speeding up data processing.

关键词： embedded fiber bragg grating simulated annealing algorithm