bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dynamic chaos in the kicked “photon-qubit atom”
Authors: Semenov Andrey , Satanin Arkady 
Published: January 2021

Abstract
We study dynamics of a qubit coupled to a single photon mode in a high-quality resonator. For a weak coupling constant the qubit and photon form a long-lived bound state which may be called as a “photon-qubit atom”. We consider the stability and chaotic dynamics of the photon-qubit atom under the action of short electromagnetic pulses. The photon oscillator considered in the classical approximation. We plot the Poincare surface to indicate the appearance of the chaotic behaviour. It is shown that depending on the qubit and field parameters the system may be demonstrating the chaotic behaviour.
An adaptive Gradient-type Method for Composite Optimization Problems with Gradient Dominance Condition and Generalized Smoothness1
Authors: Stonyakin Fedor , Kuznetsova Olesya , Artamonov Sergei , Baran Inna , Fitaev Ibraim 
Published: January 2021

Abstract
We consider an interesting class of composite optimization problems with a gradient dominance condition and introduce corresponding analogue of the recently proposed concept of an inexact oracle. This concept is applied to some classes of smooth functional.
Parallel robots modelling and optimization
Authors: Maminov Artem D. , Posypkin Mikhail A. 
Published: January 2021

Abstract
Parallel robots are mechanical systems with numerous applications in manufacturing, medicine, space industry, etc. Such robots are characterized by closed kinematic chains ensuring robustness and maneuverability. The design of a fully functional parallel robot is a time-consuming task as an engineer needs to enumerate and compare many variants in order to find one with the best characteristics. Typical characteristics are the area of the workspace, the number of singularity-free regions, dexterity index. The design of a parallel robot is thus a multi-objective constraint optimization problem. We propose to use interval analysis to reliably compute characteristics and multiobjective optimization methods to find the Pareto-optimal set of robot parameters. The proposed approach is illustrated on a set of several realistic parallel robotic systems.
Singularity of Optimal Control for a Timoshenko Beam
Authors: Ronzhina Mariya , Manita Larisa 
Published: January 2021

Abstract
We study singularities of optimal solutions in a problem of controlling the Timoshenko beam vibrations. The Timoshenko beam vibrations are described by a system of two coupled hyperbolic equations. Controls are introduced as external bounded forces. We consider the problem of minimizing the mean square deviation of the Timoshenko beam from the equilibrium position. For some initial conditions we reduce this problem to the optimal control problem for ordinary differential equations. We study the case of two-dimensional controls. For some initial positions of the beam, we prove that the optimal solutions have a Fuller type singularity. We give an asymptotic representation of the corresponding family of optimal trajectories.
Combined application of ultrasonic and ultra high frequency techniques in the partial discharge detection and positioning of gas insulated switchgear
Authors: Xiao Jing , Li Xin , Tang Yongming , Hu Jinghao , Wang Lirong , Xu Puming , Yan Ying , Wu Shuifeng 
Published: January 2021

Abstract
Partial discharge live detection of GIS can effectively find internal defects, but it is often interfered by surrounding environmental noise, which affects the correct identification and judgment of defect signals. This paper introduces the application of AE and UHF technique in the live detection of GIS, which successfully recognizes the external interference signal, analyzes the cause of abnormal partial discharge signal based on signal characteristics, and uses the method by calculating time difference to locate the source of the signal. An internal checking on the equipment were conducted based on the test results while the equipment were stopped, and verified the existence of floating fault inside GIS.
Analysis of integrated energy customers under the background of energy revolution
Authors: Wang Lili , Zhang Linjuan , Xu Changqing , Huang Ruting 
Published: January 2021

AbstractChina’s rapid economic development has brought a series of environmental problems, which seriously threaten people’s production and life. Driving the energy revolution and building clean and safe energy systems have become an important part of China’s sustainable development. As a crucial means to reduce energy cost and improve energy efficiency, integrated energy service has been gradually developed in recent years. In this context, how to manage the integrated energy customers and improve their satisfaction and loyalty has become an urgent problem to be solved. This paper applies the method of high dimensional data clustering (HDDC) to study this issue. Moreover, a case study has been analysed to illustrate the suitability and effectiveness of the proposed framework with the daily electricity consumption data of industrial enterprises. This paper has practical value for the integrated energy service providers.
Recent Advances in Sediment Microbial Fuel Cells
Authors: Zhao Qing , Ji Min , Cao Hongmei , Li Yanli 
Published: January 2021

Abstract
Sediment microbial fuel cell is a kind of microbial fuel cell with anode and cathode respectively placed in sediment and water, which can be used in the fields of power supply of low-power equipment and in-situ remediation of river and lake sediments. This paper introduced the related research, and summarized the principle, influencing factors, microbial community, and application.
A review on analytical methods of petroleum hydrocarbons in water and sediment of aquatic systems
Authors: Yue Zongkai , Shi Qirang , Ai Jia , Peng Shitao , Miao Xinyu , Wang Zhiyong 
Published: January 2021

Abstract
In this paper, the research progress on the extraction and analysis methods of petroleum hydrocarbon in water and sediment were reviewed. The principle, application scope, advantages, disadvantages and applications of various extraction methods and determination methods are summarized systematically. At present, liquid-liquid extraction is the most commonly used method to extract petroleum hydrocarbons (PHCs) in water samples, while Soxhlet extraction and ultrasonic extraction are the most commonly used methods to extract PHCs in sediment samples. Gas chromatography is the main development direction to determine the concentration of specific components of PHCs.
Fracture Failure Analysis for Wave Trap Hanging Ring in 220kV Line
Authors: Rong Huang , Yi Xie , Chao Feng , Xianhui Cao , Jun Wang 
Published: January 2021

Abstract
The failure cause of the fracture in wave trap hanging ring in A-phase fault tripping of a 220kV line was analyzed by using macroscopic inspection of fracture, chemical composition analysis, hardness test, metallographic structure analysis and fittings load calculation. The results show that the main causes of hanging ring fracture were unqualified material and welding quality.
Research On Auxiliary Decision-making Technology In the Early Stage of Power Network Base On Multi-plan Integration
Authors: Liu Mengxuan , Zhang Zihe , Zhang Shunxian , Zhang Xiaoliang , Yin Yixing 
Published: January 2021

Abstract
Under the current national comprehensive promotion and deployment of “building territorial spatial planning system and supervise its implementation” background, power network planning and construction must be based on the “multi-plan integration”, in line with the requirements of territorial spatial planning. This paper puts forward the construction scheme of the “early stage of power network auxiliary decision-making tool basing on multi-plan integration”. This tool is based on GIS technology to realize the intelligence, visualization and refinement of substation site and network path selection, which can solve the problem that at present, the grid planning is not coordinated, and inconsistent with other planning, and help improve the efficiency of power network planning and construction.
Mechanical properties and constitutive relationship of Chinese 7A21 aluminum alloy
Authors: Zhu Qiang , Yu Han , Tang Jiebin , Dong Shaobo , Hu Xiaoguang 
Published: January 2021

Abstract
For the design and calculation of transmission line repair tower using high strength aluminum alloy materials, it is necessary to fully understand the mechanical properties and constitutive model of aluminum alloy materials. In this paper, the mechanical properties and constitutive relations of the newly developed 7A21 high strength aluminum alloy for processing L50 × 5 and L80 × 6 profiles are experimentally studied, the newly developed grades of Aluminum alloy include tensile strength fu
, nominal yield strength f0.2
, elongation at break δ10
and section shrinkage ψ, and fit the constitutive model, the basic data support is improved for the design and application of the aluminum alloy material in engineering structure.
Flow and heat transfer characteristics of liquid metal sodium in tubes with different inner wall structures
Authors: Luo Chengyuan , Huang Zizhen , Zhu Xiugen , Qian Peng , Liu Minghou 
Published: January 2021

Abstract
In order to explore the influence of heat transfer medium on the enhancement of flow and heat transfer in the channel, the radial distribution of the streamwise velocity and temperature of water and liquid metal sodium in the square rib tube and the average convective heat transfer coefficient are compared. Numerical results show that the velocity gradient of liquid metal sodium near the wall is slightly larger than that of water, while the temperature gradient is significantly smaller. The heat transfer effect of liquid metal sodium is significantly better than that of water. When the velocity is 3m/s and 11m/s, the average convective heat transfer coefficient of liquid metal sodium increases by 220.59% and 193.42%, respectively, compared with water. In order to analyze the effect of inner strengthened structure on the flow and heat transfer characteristics of liquid metal sodium, the circular tube, square rib tube and circular arc rib tube are studied. Numerical simulation results show that both the average Nusselt number and pressure drop of square rib tube are the largest. When Peclet number is 270 and 990, the average Nusselt number of square rib tube increases by 13.60% and 57.89%, respectively, compared with that of circular tube.
Research on operation monitoring system of spot electricity market
Authors: Xu Ming , Song Wenqin , Tuo Jianjun , Liu Dunnan , Li Tengjian 
Published: January 2021

Abstract
At present, the power system reform has entered a critical period, and the construction of electric power spot market is the core link of deepening the reform of electric power system. In this paper, based on the spot market, combined with the theory of power market operation analysis and monitoring, on the one hand, it analyzes the establishment of power market operation evaluation index system frame, on the other hand, it puts forward the basic principle of power market operation monitoring. Market power monitoring in the electricity market is a key direction that the power regulatory agencies in the market-oriented environment pay close attention to and urgently need to study. We should actively study and explore the market operation monitoring system to adapt to the characteristics of China’s power industry and power market reform.
Research on Simulation and identification method of abnormal bidding behavior of power market members based on cloud technology
Authors: Chang Youyi , Liu Dunnan , Li Qingchun , Cai Zhiyuan , He Xiaoyang , Zhang Ye , Zhang Jian 
Published: January 2021

Abstract
In order to solve the problem that abnormal bidding behaviors are difficult to be identified and controlled in the electricity market, a method based on cloud technology is proposed to simulate and identify abnormal bidding behaviors of power market members, which can give real-time early warning of potential abnormal bidding behaviors in the transaction process. The application of cloud technology big data in simulation identification effectively solves the problem that potential bidding abnormal behavior is difficult to be quantitatively identified, and also overcomes the defect that general identification methods are not easy to understand. Firstly, the paper combs the members, trading methods and types of electricity market, and analyzes the influencing factors of bidding decision-making behavior of power market members; secondly, it designs the general framework and steps of identifying potential abnormal bidding behavior; at the same time, it studies the dynamic evolution trend of bidding behavior of market members, on this basis, realizes the identification of abnormal bidding behavior of market members, and manages and regulates market members.
Flow Characteristics of UBD Applied to Gas Reservoirs
Authors: Lu Zongyu , Liu Yingbiao , Xi Chuanming , Tian Long , Zhu Zhongxi 
Published: January 2021

Abstract
Underbalanced drilling technology implemented in high pressure and low permeability gas reservoirs can better protect gas formation from drilling fluid damage, and can improve the drilling speed, but gas invade into the wellhole from the formation by the underbalanced pressure will make the borehole flow presented two-phase flow state. The gas phase compactness and slippage effect will increase the drilling of well control difficulty. In order to ensure the invaded gas is not appear violent slippage and rapid inflation, study the two-phase flow law is necessary to determine the size of the applied well backpressure, applying process of gas distribution law in borehole, and the bottom hole pressure, for the reasonable design of drilling fluid density, well backpressure design and the equipment selection. This paper applies the numerical difference method to two-phase flow one-dimensional equations were solved. Combined with an example of drilling, the gas void fraction distribution, migration and bottom-hole pressure change law is given, which provides theoretical basis for low permeability gas reservoirs in underbalanced pressure drilling borehole designing.
Study on flow and heat transfer of liquid metal in a new top-slotted microchannel heat sink
Authors: Chen Zhiwei , Qian Peng , Huang Zizhen , Luo Chengyuan , Liu Minghou 
Published: January 2021

Abstract
In order to overcome the disadvantage of large pump power required to maintain flow with the large flow resistance caused by high viscosity and high density of liquid metal in microchannel heat sink, a new top-slotted microchannel is designed in this paper. The flow and heat transfer performance of microchannel heat sink with different slot heights was studied by numerical simulation. The results show that the lowest pump power of 0.00157W is obtained when the slot height is 0.8mm without affecting the cooling performance of the microchannel heat sink, which is 16.5% lower than that of the traditional channel.
Research on Nuclear Energy and Fossil Fuels in China
Authors: Feng LuDa 
Published: January 2021

Abstract
After the courses about Energy and environmental engineering combined with current events, new energy is a very important research object which can not to be ignored. In China, fossil fuels are the major energy resources, it is cheap and high versatility, but when using fossil fuels, it will not only emit fine particles, but also destroy the ecological environment. Nuclear energy has many other advantages within the government’ s focus. This article analyzes the possibility that the nuclear energy can replace fossil fuels.
Assessment of the Maximum Permissible Load of Pollutant in an opened coastal zone using a water quality model: a case study in Hainan of China
Authors: Ouyang Xiyu , Zhao Peng , Chen Hanbao 
Published: January 2021

Abstract
This study aims to estimate the maximum-permissible-loads of pollutant by means of water quality modelling, in order to maintain the concentrations of pollutions below prescribed water quality targets. Modelling of water quality used the Mike21 HD and ecolab modules, while the assessment of maximum-permissible-loads of pollution used the method of response factor coefficient. This research is descriptive quantitative parameters of COD. A scenario assessment was carried out by the flows from various point sources to understand the site-specific relationships between pollution sources and water quality conditions, as well as calculating the maximum-permissible-loads to determine the pollution point source discharge.
Research on the mooring arrangement of a small ship against typhoon in harbor
Authors: Shen Wenjun , Luan Yingni , Chen Hanbao 
Published: January 2021

Abstract
Based on the time domain coupled model, the feasibility of a small vessel moored at the berth against typhoon is studied using the numerical simulation method. Considering the nonlinear characteristics of mooring lines and fenders, the dynamic response characteristics of the coupled system of ship, mooring lines and fenders are analyzed for different mooring arrangement. The reasonable and feasible layout is recommended for typhoon protection, and the influence law of cable load with different pretensions is discussed. The calculation results show that: when the number of mooring lines is increased to 16 and 422 mooring arrangement is adopted, then the mooring safety can be met under the survival condition. At the same time, it is found that the cable load does not decrease with the increase of pretension, but has a trend of decreasing first and then increasing. Therefore, it is necessary to select a reasonable pre-tension during mooring operation.
Investigation and Study of Epibenthic Corals near Hassyan Power Plant in Dubai
Authors: Yina Wang , Cheng Peng , ke Xu , Qing Zhang 
Published: January 2021

Abstract
Harbour and breakwaters of Hassyan power plant are located within Jebel Ali marine ecological reserve in Dubai, UAE. Project sea area has a good diversity and healthy environmental condition. Especially lots of live corals were found in this area. The distribution of epibenthic corals should be investigated in order to meet the requirement of environmental protection. The density, species and distribution were quantitatively estimated by the me thod of underwater video and remote sensing. The investigation showed that eighteen live coral species were recorded from six stations. Two of stations were moderately dense and the richest coral communities, while the other four were sparse communities. The highest cover rate was 37.89%. The investigation results provided basis datum for corals protection and translocation.
Sediment Grain size and heavy metal pollution characteristics in the mud deposit area offshore the Shandong Peninsula before 5000 years
Authors: Zhu Yingtao , Zhu Longhai , Liu Tao , Chen Hanbao 
Published: January 2021

Abstract
In this paper, we analyzed the characteristics of grain size, distribution of seven heavy metals and pollution characteristics of sediments from mud deposit area offshore the Shandong Peninsula before 5000 years, and quantitatively evaluate the ecological risk by the potential ecological risk index method. From 5000 to 8500a, the sediment types in the muddy area offshore Shandong Peninsula are very simple, all of which were silt. The average contents of seven heavy metals were 84.03, 78.78, 30.12, 24.71, 7.39, 0.10 and 0.01μg/g, respectively. The results of single factor pollution evaluation showed that only the content of Cr in the sediment exceeded the standard slightly 5000 years ago, with the maximum exceeding ration of 5%. The RI values of heavy metals in the sediments ranged from 71.28 to 180.79, and the sediments were at low potential ecological risk and had little biological toxicity except for individual layers.
Research status of ship’s ballast water detection
Authors: Liu Liankun , Jia Jianna , Chu Qiang , Zhang Kailei , Peng Shitao 
Published: January 2021

Abstract
Marine ballast water is the main way of marine biological invasion and poses a serious threat to marine ecological security. In order to effectively prevent biological invasion and protect marine ecological safety, the International Maritime Organization (IMO) has adopted the International Convention for The Control and Management of Ship’s Ballast Water and Sediments. In this paper, the progress of the implementation of the convention is briefly introduced, with emphasis on the detection methods of ballast water according to the requirements of regulation D-1 and regulation D-2, such as salinity analysis method, colored dissolved organic matter content analysis method, microscope detection method, chlorophyll A detection method, flow cytometry detection method and flow imaging detection method.
Progress in protein engineering of Organophosphorus hydrolase (OPH)
Authors: Gu Qiamin , Zhao Chuanxin , Chen Gaoyun , Qi Xiuli , Liu Min 
Published: January 2021

Abstract
The biodegradation of organophosphorus pesticides is characterized by high efficiency, mild reaction conditions, no stimulation, environmental friendliness and no secondary pollution, however, the hydrolysis activity, expression level and thermal stability of wild-type enzymes restrict the practical application of biodegradation seriously. Using protein engineering methods, researchers have made many achievements in improving the properties of enzymes.
Study on Admixture of Super Retarding Concrete
Authors: XuJiale  
Published: January 2021

Abstract
This paper mainly studies the influence of five kinds of retarding materials, such as sodium gluconate, sugar, citric acid, maltodextrin and sodium tripolyphosphate, on the setting time of concrete. Through gradient experiment of five different retarders, the influence of the amount of five kinds of retarders on the setting time and strength of concrete is obtained. The experimental results show that different kinds of retarders have different effects on the setting time and compressive strength of concrete. The use methods of super retarded concrete admixtures in 30 hours, 40 hours, 50 hours and 60 hours are obtained by orthogonal experiment.
Effects of melatonin on growth, non-photochemical quenching and related components in tomato seedlings under calcium nitrate stress
Authors: Xie Qingrong , Luo Haotian , Cheng Xuekun , Li Zelin , Lu Wei , He Zhongqun , Zhou Xiaoting 
Published: January 2021

Abstract
The effects of exogenous melatonin on the growth, chlorophyll fluorescence parameters and related components of distribution of heat dissipation in tomato seedlings under Ca (NO3) 2 stress were studied in this experiment. The results showed that calcium nitrate stress inhibited the growth of tomato seedlings, reduced Y (II), Fv’/Fm’, qP and ETR, and produced photoinhibition on tomato seedlings. Spraying exogenous melatonin could increase the growth of tomato seedlings under calcium nitrate stress. Melatonin regulated qP and ETR under calcium nitrate stress, reduced the ratio of Y(NPQ), Y(NO), and increased the ratio of Y(II). Further analysis of NPQ and its three components, which including qE, qT and qI, showed that NPQ and its three components were significantly increased in the stress treatment group, while melatonin could inhibit the increase. Thus, it indicated that exogenous melatonin could effectively alleviate the growth of tomato seedlings under calcium nitrate stress, maintain the reasonable distribution of light energy, and protect the photosystem II from light damage caused by excess light energy.