bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling of charge effects in dielectric films of radiation MOS sensors
Authors: Andreev D V , Bondarenko G G , Andreev V V , Stolyarov A A
Published: January 2021

We have modeled the charge effects in radiation metal-oxide-semiconductor (MOS) sensors functioning in a wide range of electric fields including high-field injection of electrons into the dielectric film. In order to study the charge effects taking place in MOS sensors, we use the extended model suggested by us previously. The extended model, besides the accumulation of positive charge in the dielectric and the generation of the surface states at the interface, takes into consideration the accumulation of negative charge in the bulk of dielectric film caused by the electron capturing on traps. We demonstrate that the accumulation of the negative and positive charges in the bulk of the gate dielectric under high fields can significantly influence on the redistribution of electric fields inside the dielectric and, as a sequence, on change of the charge state of MOS structure which describes the sensor characteristics. We have ascertained that in order to properly utilize MOS sensors under high-field injection of electrons it has been necessary to take into consideration the possible capturing of electrons in the bulk of gate dielectric and adjust results of measurements with the model suggested.
Probability laws in multi-dimensional noisy HK-models
Authors: Bolychev Anton , Manita Anatoly
Published: January 2021

The classical Hegselmann-Krause opinion dynamics model is known for the simplicity of its interaction rules and for the striking complexity of its collective behavior observed in computer simulations. The nonlinearity of the dynamics makes an analytical study of the model a very hard task. Recently there is some interest in introducing a random noise in the HK dynamics. In our study we focus on exact analysis of probability laws for a noisy HK model and give a detailed description of distribution transformations related to such systems. Our results shed some light on a long-time behavior of the noisy HK model and open new possibilities for future analytical and numerical studies in this area.
Two-body metal-insulator transitions in the Anderson-Hubbard model
Authors: Stellin F , Orso G
Published: January 2021

We review our recent results on Anderson localization in systems of two interacting particles coupled by contact interactions. Based on an exact mapping to an effective single-particle problem, we numerically investigate the occurrence of metal-insulator phase transitions for the pair in two-(2D) and three-dimensional (3D) disordered lattices. In two dimensions, we find that interactions cause an exponential enhancement of the pair localization length with respect to its single-particle counterpart, but do not induce a delocalization transition. In particular we show that previous claims of 2D interaction-induced Anderson transitions are the results of strong finite-size effects. In three dimensions we find that the pair undergoes a metal-insulator transition belonging to the same (orthogonal) universality class of the noninteracting model. We then explore the phase diagram in the space of energy E, disorder W and interaction strength U, which reveals a rich and counterintuitive structure, endowed with multiple metallic and insulating phases. We point out that this phenomenon originates from the molecular and scattering-like nature of the pair states available at given energy and disorder strength.
A Simulation Model for Macro- and Micro-Fusion Algorithms in the CPU Core
Authors: Vishnekov A V , Ivanova E M , Stepanov N A , Shaimov N D
Published: January 2021

The article discusses the features of modern processor’s microarchitecture, the method of instruction’s and micro-operation’s accelerated execution. The research focuses on the organization of the decoding stage in the CPU core pipeline and Macro- and Micro-fusion algorithms. The Macro- and Micro-fusion mechanisms are defined. A computer simulator has been developed to explore these mechanisms. The developed software has a user-friendly interface, is easy to use, and combines training and research options. The computer simulator demonstrates the sequence of mechanism’ s implementation; the resulting macro-or microoperations set after Macro- and Micro-fusion, and also reflects each algorithm features for different processor’s families. The software allows you to use either a pre-prepared file with Assembler (x86) code fragments as source data, or enter/change the source code fragments at your request. The main combinations of machine instructions that can be fused into a single macro-operation are considered, as well as instructions that can be decoded into fused micro-operations. The simulator can be useful both for in Computer Science & Engineering students, especially for on-line education and for researchers and General-purpose CPU cores developers.
Selective pumping of a nonlinear quantum oscillator
Authors: Bastrakova M V , Klenov N V , Satanin A M
Published: January 2021

Selective pumping of a quantum system under the influence of unmodulated short-range pulses of large amplitude is studied using the example of a weakly nonlinear Josephson oscillator. An exact solution is obtained in the case of small parameter anharmonicity for changes in the system energy and population of levels after impact. It is shown that due to the interference of state amplitudes, it is possible to stabilize the system and prevent undesirable excitations (energy growth). When anharmonicity is taken into account, the system stability conditions are studied numerically. The obtained results are important when analyzing leakage to high-lying levels in a transmon-qubit under the influence of short unipolar control pulses.
Dynamic chaos in the kicked “photon-qubit atom”
Authors: Semenov Andrey , Satanin Arkady
Published: January 2021

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

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

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

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

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

China’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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
The effect of anodic potential on bornite dissolution: A key button of copper pollution
Authors: Lin Hao , Wang Jun , Qiu Guanzhou
Published: January 2021

The relationship between anodic potential and sulfur film of bornite in acidic electrolyte was investigated by electrochemical experiments and surface analytical techniques. The formation of sulfur film decreased the conductivity of bornite, and the initial current density of bornite was positively correlated with subjected potential due to thermodynamic energy. The higher potential hindered the formation of sulfur precipitates Sn
2-/S0 and forced products of bornite diffuse into electrolyte. The S 2p
3/2
spectrum proved that S2- has been converted to S2
2-, Sn
2-/S0 and SO4
2- during bornite dissolution. Combined with the composition of sulfur film formed on the bornite surface, the passive effect of sulfur film was mainly caused by formed Sn
2-/S0. The solution potential was the primary factor in the bornite dissolution under acidic environment.
Design Of Pluggable Solar Greenhouse
Authors: Wenxiong Yang , Chengwei Ma
Published: January 2021

Original design of a plug-in assembly type solar greenhouse, good insulation effect, plug and pull, can change the height and length of the wall according to production needs. This new type of solar greenhouse adopts plug-in heat preservation wall. This kind of wall adopts standardized module, which can be industrialized mass production. It has the advantages of low cost, convenient disassembly, assembly and transportation, and protection of land and environment.
Advances in Cd Remediation Techniques for Contaminated Soils
Authors: Changjia Jiang , Shuang Cui , Qi Feng , Xiuli Sun
Published: January 2021

For heavy metal Cd pollution, here are two general ideas for solving Cd pollution. Firstly, Cd separated or extracted from the soil and decreased in soil Cd content. Secondly, the existence of Cd were changed in soil, reduced its mobility and bioavailability. At present Cd contaminated soil remediation technology is divided into three main categories: physical remediation technology, chemical remediation technology, bioremediation technology.
Review on the connotation, Evaluation and Path of Industrial High Quality Development in the Yellow River Basin
Authors: Li Linshan , Li Wei
Published: January 2021

The Yellow River Basin is an important ecological barrier and an important economic zone in China, which plays a very important role in ecological security and economic and social development in China. The industrial foundation of the Yellow River Basin is solid, with huge market potential, but there are also many problems. Through literature combing, identifying the connotation of watershed industrial high-quality development, comparing the evaluation index system of industrial development quality, summing up the countermeasures and suggestions of high-quality development path, which provides useful inspiration for the study of high-quality development theory of watershed industrial economics and economic geography in China.
Research on Ecological Environment Changes Based on Remote Sensing Monitoring Perspective
Authors: Yuan Qingmin , Wang Haoting
Published: January 2021

Accelerating process of urbanization has brought about a series of ecological and environmental problems. In this paper, vegetation index, humidity index, surface temperature, and building-bare soil index are used to quantitatively characterize the four ecological element indexes of greenness, humidity, heat and dryness. Through principal component analysis, a remote sensing ecological index model is established, and this article comparatively analyzes the remote sensing ecological index in 2014 and 2019 from the two dimensions of time and space. The results show that the ecological environment of Qingdao is partially optimized and improved but the overall trend is decreasing.
Effect of humidity on atmospheric VOCs measurement
Authors: Bi Zhe , Shi Yaolong , Wang Zhen , Han Xiao , Wang Man
Published: January 2021

Trace volatile organic compounds (VOCs) play an important role in physic-chemical processes of the troposphere. Accurate measurement of ambient VOCs is needed. However, the determination of VOCs is difficult due to the large amount of water in atmosphere. A dynamic dilution and humidifying system was developed to study the impact of water on ambient VOCs measurement. Result showed that the deviation of aldehydes and ketones was much larger comparing with the BTEX compounds. And the C10-C11 compounds were more susceptible to air humidity compared with C6-C8 compounds. This showed that the hydrophilic compounds and compounds with high carbon number were more susceptible to air humidity comparing with hydrophobic compounds and compounds with lower carbon number.
Optimization of recharged water quantity of Yufuhe River in Jinan City based on Hydrus-2D Software, China
Authors: Sun Xiuxiu , Ren Qinglian , Wang Weiping , Xu Qiaoyi , Wang Qing
Published: January 2021

Jinan, Shandong Province, China frequently faces challenges related to spring protection and water supply security, and managed aquifer recharge (MAR) presents an effective solution to these challenges. Three MAR projects with multiple sources in Yufuhe River in Western Jinan City are conductive to increasing groundwater supply and maintaining groundwater levels. In order to determine the reasonable recharge flows and time, the hydrogeological conditions of the study area were described, the river infiltration recharge processes were simulated by Hydrus-2D software, and the recharge schemes for different groundwater depths were put forward. The results show that the model can achieve the better fitting effect. When the releasing flow is small, the optimal scheme is to continuously discharge water by 286800, 282500 and 282000 m3/d for 19.5, 12.7 and 10.5 days when the groundwater depth is 42, 30, 23 m at Cuima Village respectively. This study has certain significance for the efficient water lease of the Yufuhe River recharge project in Jinan City.
Design of Patrol Unmanned Aerial Vehicle Based on MPU9250
Authors: Tang Yanfeng , Lin Songbin
Published: January 2021

To improve the attitude control accuracy of quadcopter UAVs, a patrol UAV with STM32 as the main controller and MPU9250 as the attitude detection module is designed in this paper. For attitude control part, a kind of attitude control algorithm which preprocesses by extended Kalman filter algorithm is designed and then a cascade PID control algorithm is adopted. The test flight results show that the UAV can achieve functions of lifting, rolling, pitching, yawing and hovering.
Design Water Level Calculation And Analysis Of Chittagong Power Plant Project In Bangladesh
Authors: Guan Ning , Chen Hanbao , Xu Yanan , Luan Yingni , Tan Zhonghua
Published: January 2021

The design water level calculation methods in the Chinese and foreign codes are different. The design high and low water levels and extreme high and low water levels in the Chinese norms are calculated using historical cumulative frequencies with tide level data of not less than 1 year and 20 years, respectively. In foreign norms, the average high and low tide levels of spring tides are mostly used as the design high and low water levels, and for the sea areas lacking long-term measured data, the water level combination method is mostly used to determine the extreme water levels. This paper compares the results of different methods used to calculate the design water level using the Chittagong Power Plant in Bangladesh as an example. The calculations show that it is safer to use the tidal eigenvalue method to determine the design high and low water levels, and that the Water Level Combination Method is more suitable for extreme water level determination than Bangladesh National Building Code.
Research on Change Laws of Pore Water Pressure of Soft Clay in the Large-scale Wave Flume
Authors: Zhen Liu , Yongzhou Cheng , Huaqing Zhang , Xiangwei Meng , Yunpeng Jiang , longzai Ge
Published: January 2021

The study on the interaction between wave structure and soft clay foundation is carried out in the large scale wave flume trough of the Academy of communications and transportation under the construction of the research on the failure mechanism and design parameters of the port hydraulic structure under the harsh hydrology condition. The remolding technology of the soft clay foundation of the Yangtze River mouth is studied. The model test scale of is 1:5. In the test, the strength of the original soil can be reduced to the similarity of the test phenomenon. The soil strength is reduced by increasing the water content of the original soil, and a series of tests are made on the characteristics of the original soil. The strength of soil increases with the increase of static time. The early growth is fast and the later growth is slow. In the experiment, the soil pressure and pore water pressure sensor were arranged to observe the change rule of soil pressure and pore water pressure under the action of wave. By arranging water pressure sensor and laser displacement sensor, the force and settlement of the structure of the semicircle caisson were observed. In this paper, the variation rule of earth pressure and pore water pressure under different wave heights and longtime waves are studied. The pore pressure and soil pressure change with the wave action, the influence of pore pressure increases with the increase of wave height. Maximum pore pressure occurs at a certain depth of soil. The change in pore pressure is irregular. After a certain value is reached, the soil is softened and destroyed.
Experiment of Ship Maneuvering Motion in Muddy Navigation Area
Authors: Peng Wen Chun , Ni Luan Ying , Xiu Pang Qi , Bo Zhang Rui
Published: January 2021

In order to make full use of natural resources and ensure the safety of the ship navigation, based on the self-designed ship trajectory tracking system, the self-propelled model test of ship maneuverability which include cycle test and zig-zag test under the combined effects of water and fluid mud was completed in the test pool. And then based on the results of the tests, the influences of under-keel clearance on ship resistance, heading stability and turning radius were analyzed, and the maneuverability of the ship’s navigation in the fluid mud was comprehensively evaluated. The results show that as the under-keel clearance decreases, the linear stability of the ship increases, but its maneuverability deteriorates. In order to ensure safety, the depth of ship dragging into the fluid mud must be less than 10% of ship’s draft.
Experimental study on wave-induced load on crest wall in North Indian Ocean
Authors: Jiang Yunpeng , Chen Hanbao , Ji Zezhou , Zhang Huaqing
Published: January 2021

Wave-induced load is one of the most important aspects in the design of coastal engineering. It is well known that long period waves are very common along the coast of the Atlantic and India ocean, which is rather different from wind waves. Many coastal projects were designed by China Design Code and American Coastal Engineering Manual (CEM). Physical model test was carried out in this paper to study wave loading of crest wall under impulsive action by long-period wave. The result of test was compared with China Design Code and CEM. And then a verification test was also adopted to prove that there was obvious difference between them. It was indicated that China code and CEM had very close results but much smaller than that of model test, with ratio of 1:5. The long-period wave load on crest wall was much more than results by empirical formula. The isolated crest wall and rear unsupported was also taken up with wave action and it was destroyed easily. So impulsive action by long-period wave on crest wall should be paid more attention in project design. The scope of empirical formula is limited and physical model test is indispensable for the reliability of structure.
Monitoring of the Effects of Dry and Wet Dust Removal Equipment at a Coal Port Transfer Station
Authors: Hong Ningning , Peng Shitao , Ye Yin , Hu Tao , Su Ning
Published: January 2021

Dust removal technology in port transfer station is divided into dry and wet types. Based on the monitoring data of a professional coal port, this paper compares the dust removal rates of dry and wet dust removal equipment in transfer station. The monitoring results show that the dust suppression rate of wet dust removal equipment in port transfer station is nearly twice of dry dust removal equipment. The results of this paper can provide a reference for the dust removal scheme decision of dry bulk cargo terminal transfer station.
Refined Dust Fine Control Method of Bulk Cargo Yard Based on Whole-field Monitoring
Authors: Ye Yin , Hong Ningning , Su Ning , Peng Shitao
Published: January 2021

The fine dust control method and control system of bulk cargo yard based on whole-site monitoring are realized through the following paths. Firstly, the extinction coefficient of the whole area of the storage yard is obtained by using lidar, and the proportion relationship between the extinction coefficient and the dust concentration data measured at the same position is obtained to obtain the dust concentration distribution in the whole area. Secondly, the radar scanning plane is divided into N grids with the control range of each spray head as a grid unit, and the average dust concentration in each grid is calculated. Thirdly, the critical value of the average dust concentration and the critical value of dust contribution rate are set to judge the grid that needs to start the sprinkler head. Repeat the above process to achieve continuous fine control of dust in bulk cargo yard. The system not only improves the efficiency of dust suppression, but also reduces the amount of sprayed water, achieves the purpose of improving the efficiency of environmental protection effects, reducing the labor intensity of workers, and maximizing the utilization of water resources while effectively removing dust.
Influence of guaranteed power supply service on competitive power market and compensation mechanism design
Authors: Wang Dongfa , Ding Weibing , Gao Feng , Xu Yang , Hu Jiahua
Published: January 2021

In the modern power market system, it is necessary to establish a mature power supply guarantee service mechanism to protect the rights and interests of all users, realize the reasonable allocation of power resources and achieve the “Pareto improvement” of social welfare. Based on a broader definition of guaranteed power supply service, this paper clarifies the scope and mode of guaranteed power supply service, calculates the power supply cost and market clearing electricity of guaranteed power supply service, and designs a corresponding compensation mechanism system to promote the sustainable development of guaranteed power supply service. In the long run, guaranteed power supply service should return to the market mechanism, pricing based on “power supply cost + reasonable profit”, and become an essential part of the competitive power market.
Low-speed wind turbine design based on Wilson theory
Authors: Yunhao Chen , Danmei Hu , Zhenjiang Zhao
Published: January 2021

As a clean and renewable energy with huge reserves, wind energy has been widely developed and utilized worldwide. Wind turbine blades are one of the main components of wind power generation. The degree of conversion of wind energy by the blades can determine the efficiency of the wind turbine. This paper aims to optimize the design of low-speed wind turbine blades with a rated power of 600 kW and an average wind speed of 4.3 m/s at the hub height. Wind turbines use variable speed and pitch control to determine the design parameters of the wind turbine. We choose an airfoil with good aerodynamic performance at low wind speeds. The Wilson design method is used to calculate the chord length, torsion angle and other parameters of each segment of the blade, complete the preliminary shape design of the low-speed blade, and calculate its aerodynamic performance.
Design of Intelligent Firefighter Helmet Based on AR Technology
Authors: Dianxi Zhang , Danhongand Chen , Zhen Gong
Published: January 2021

Traditional firefighter helmet has the disadvantages of poor shading and lack of flexibility. AR is the process of computing 3d coordinate points according to the image points of real objects, and then superimposing “virtual + real” surreal scenes based on real scenery through the calculation simulation of the processor. The AR firefighter helmet is a new type of firefighting protective that uses AR technology in traditional firefighter helmet. Intelligent firefighter helmet based on AR technology uses 3D simulation imaging technology, thermal camera tracking technology, human-computer interaction technology, and code recognition technology to maximize the effect of realistic fire scenes. It can enable firefighters to see the real situation in the scene of heavy smoke and improve the efficiency of rescue. Therefore, firefighter helmets with AR equipment represent the future development trend of firefighter helmet. This paper discusses the theory, value, technical operation, design and development of intelligence. The research on the fireman’s helmet based on augmented reality technology has leading advantages and application value.
Fractional plasticity with anisotropic yielding
Authors: Lu Wei
Published: January 2021

Granular soil in the field may have an extent of anisotropy, due to natural sedimentation process. To capture the anisotropic constitutive behaviour of such granular soil, an anisotropic fractional-order plasticity approach based on an anisotropic yielding surface is developed in this study. By calculating the stress gradient on the anisotropic yielding surface, a state-dependent stress-dilatancy relation considering material anisotropy is obtained. Then, several different triaxial test results of anisotropically consolidated granular soil are simulated and compared by the model. It is found that the proposed anisotropic fractional plasticity model can reasonably simulate the stress-strain behaviour of silty sand Merriespruit tailing. However, more effort needs to be carried out to enhance the model for more complicated loading condition.
Research on Building Energy Saving Reconstruction of Industrial Park in Urban Fringe Residential Area in Hot Summer and Cold Winter Area
Authors: Zhou Bailing , Wang Junxuan , Xu Liang
Published: January 2021

We find that there are some problems in the process of energy-saving transformation of existing buildings in the urban fringe Industrial Park: according to the current norms, adopting standardized energy-saving transformation scheme, ignoring the actual energy consumption composition of local specific buildings. Based on this, we try to take the government led and household participation as the standard operation procedure to investigate the energy consumption situation, diagnose the weak links, evaluate the transformation results and determine the transformation scheme as the standard operation procedures.