bluuebunny/crossref_metadata_2025_split huggingface dataset:
Double-propagation mode in short-gap spark discharges driven by HV pulses with sub-ns rise time
Authors: Höft H , Becker M M , Kolb J F , Huiskamp T 
Published: July 2020

Abstract
The object of this study is the investigation of spark discharges ignited by unipolar positive rectangular high voltage (HV) pulses with 200 ps rise time and (15 ± 2) kV amplitude with 3 ns duration full width at half maximum in synthetic air in a 1.2 mm pin-to-pin gap (tungsten electrodes) at atmospheric pressure. The discharge development was recorded by synchronised iCCD and streak camera measurements in single-shot operation, revealing a two-stage propagation mode. The discharge started with a fast initial breakdown across the entire gap (∼10 mm ns−1) during the HV slope, followed by a much slower (∼0.1 mm ns−1) propagation originating from both electrodes towards the gap centre. The combination of high-resolution diagnostics with numerical modelling indicated that the initial breakdown phase is caused by the rapid increase of electric field strength during the steep HV slope, which leads to the simultaneous fast propagation of a positive and a negative streamer.
Routes to control Cooper minimum in high order harmonics generated in argon gas
Authors: Boltaev G S , Ganeev R A , Abbasi N A , Iqbal M , Kim V V , Al-Harmi H , Tong X M , Alnaser A S 
Published: July 2020

Abstract
We present a systematic study on the control of Cooper minimum (CM) in the high-order harmonics spectra generated during the interaction of Ar gas with ultrashort near-infrared laser pulses. Tailoring the width and depth of CM in argon is demonstrated by changing the gas jet position with respect to the focal plane of focusing lens and by defocusing-assisted phase-matching. We further analyze the influence of single- and two-color laser pump schemes on the appearance of CM. The application of two orthogonally-polarized fields of fundamental radiation and its second harmonic, which is also used to generate controllable yields of odd and even harmonics, led to diminishing the CM in the harmonic spectra. Our experimental findings are supported by theoretical calculations that solve the time-dependent Schrödinger equation in the microscopic domain, and take into account the phase matching in the macroscopic domain.
Controlling the helicity of magnetic skyrmions by electrical field in frustrated magnets
Authors: Yao Xiaoyan , Chen Jun , Dong Shuai 
Published: July 2020

Abstract
The skyrmions generated by frustration in centrosymmetric structures host extra internal degrees of freedom—vorticity and helicity, resulting in distinctive properties and potential functionality, which are not shared by the skyrmions stemming from the Dzyaloshinskii–Moriya interaction in noncentrosymmetric structures. The present work indicates that the magnetism-driven electric polarization carried by skyrmions provides a direct handle for tuning helicity. Especially for the in-plane magnetized skyrmions, the helicity can be continuously rotated and exactly picked by applying an external electric field for both skyrmions and antiskyrmions
.
The in-plane uniaxial anisotropy is beneficial to this manipulation.
Vega-Les Information System. Actual Features and Future Evolution
Authors: Balashov I , Bartalev S , Bartalev S , Burtsev M , Vorushilov I , Egorov V , Kashnitskii A , Khovratovich T , Khvostikov S , Kobets D , Loupian E , Saigin I , Senko K , Stytsenko F , Sychugov I , Zharko V 
Published: July 2020

Abstract
The paper describes the Vega-Les (“Les” is the Russian word meaning “forest”) information system developed in the Space Research Institute of the Russian Academy of Sciences (IKI) for complex monitoring of the Russian forests with satellite data. The Vega-Les information system provides online access to continuously updated long term Earth remote sensing data and derived products archives and automated data processing, analysis and synthesis online tools for wide range of remote users for forest resources monitoring and research. The paper gives information about system’s main features, available satellite data and provides examples of data analysis and processing tools.
The use of information and infocommunication technologies in the management of urban forests of St. Petersburg using geographic information systems
Authors: Kolbina O , Yagotinceva N , Bogdanov P. , Istomin E. , Vagizov M 
Published: July 2020

Abstract
The article considers the possibility of using infocommunication technologies in the management of urban forests. There are schemes and models of integration the Internet of things into geoinformation systems for making managerial decisions that contribute to the care of green spaces in the city of St. Petersburg.
Method for solving problems of the theory restrictions of infocommunication systems using linear equations with many unknowns
Authors: Malikova D M , Slashchev E S , Istomin E P , Vagizov M R , Kolbina O E 
Published: July 2020

Abstract
The article presents a method for solving problems of theory of constraint in the form of linear equations with many unknowns encountered in practice when managing the life cycle of engineering products. The development of any type of info-communication systems may include mathematical modeling of current processes based on a system of linear equations. The use of the method is meant for automating the process of substantiating the decisions taken at the stage of preparation for production and managing the product life cycle when managing dimensional, temporary and economic relations. The example of the first problem describes the key aspects of pricing and remuneration taking into account the productivity of workers. The second problem is to determine the economically achievable tolerance of the closing link of a dimension chain. The third problem describes the aspects of the enterprise load, taking into account mandatory contributions. These problems allow us to find a rational solution with a limited number of input data. The presented problems reveal a method for solving the problems of the theory of constraint and the prospects of using equations for practice in managing the life cycle and building automated systems.
Assessment of the influence of natural and climatic conditions on forest carting out
Authors: Mokhirev A , Bragina N , Medvedev S 
Published: July 2020

Abstract
There were many factors that influence the volume of forest carting out. They were divided into managed and unmanaged. The human impact on unmanaged factors was minimized. These included the natural and climatic conditions under which the wood carting out took place. However, these factors were among the most significant, especially in Siberia, in sharply continental conditions. The purpose of this study was to assess the influence of natural and climatic factors on forest carting out using the mathematical tool. For research data were collected on the volume of daily carting out of wood from forest areas for several years in the winter time. For the same dates, information was collected on climatic conditions: air humidity; wind speed; type of precipitation; precipitation duration; maximum air temperature; minimum air temperature; amount of precipitation; visibility range; snow depth. Multivariate analysis was performed using the Microsoft Office Excel software product, as well as controlling calculations in the Statistica 10.0 statistical product. As a result, the linear multiple regression equation was obtained.
Alternative energy in vegetable and crushed wood raw materials drying processes
Authors: Mukhametzyanov Sh R , Safin R R , Ilalova G F , Mukhtarova A R , Shageeva A I 
Published: July 2020

AbstractThe article describes an self-contained complex energy-saving plant for remote areas, that provides heat and electricity for the needs of a condenser kiln by thermochemical gasification of logging, woodworking, and agricultural waste. A special feature of the proposed plant is the condenser kiln which allows minimizing the cost of heat energy by using a compression heat pump and implementing pulse drying modes consisting of alternate stages of heating and drying. A pulse process helps avoid the use of water vapor while maintaining the quality characteristics of the materials to be dried. It was found that the use of torrefied crushed raw materials as an alternative energy source can increase the productivity of the entire self-contained drying plant.
A conceptual model for geodata processing for sustainable forest management
Authors: Tatarnikova T , Stepanov S , Petrov Y , Sidorenko A , Martyn I 
Published: July 2020

Abstract
In scientific work, the process of sustainable forest management is considered as a guiding industry principle for the interaction of man and the ecosystem. The purpose of sustainable forest management is the formation of a forest ecosystem with various resources and functions. Effective forest management is not possible without the corresponding information support. The goal of the scientific work is to develop a conceptual model of geodata processing for sustainable forest management. The objective function of the model is investigated - reforestation modeling, the result of which is the preparation of a spatial solution for sustainable forest management (managerial decision model). An algorithm for performing interconnected functional subsystems is presented: «Processing GEODATA», «Mapping», «Prediction», «Analytics», «Economic calculation», «Modeling of reforestation activities». The contextual chart “Processing GEODATA” has been developed, which describes a macromodel of the process of processing geospatial data in order to build a cartographic basis of the system under study. A general view of the geodata processing function is presented, the result of which is a three-dimensional spatial information model. The final result of the work can be used to solve the problems of forestry management at different levels of management.
Synthesis of Environmental Functional Materials and its Application in Domestic Sewage
Authors: Li Hongcui , Jiang Yuhan , Li Yurong 
Published: July 2020

Abstract
Environmental functional materials have unique physical, chemical and biological properties, and have excellent environmental purification effect, so they can be used to eliminate or reduce water environmental pollution, play the role of decolorization, deodorization and sterilization. In this paper, the composite method was used to prepare environmental functional materials, and the treatment effect of domestic sewage was studied. COD, TP and TN were the research indicators. Single factor experiment and orthogonal experiment were carried out. The results show that the best reaction conditions of COD, TP and TN are as follows: reaction time is 45 min, 55 min, 45 min, dosage is 0.180 g, 0.100 g, 0.130 g, temperature is 40°C, 60°C, 40°C. The best removal rate of COD, TP and TN was 81.8%, 59.4%, 51.1%, respectively. The treatment effect of environmental functional materials of COD in domestic sewage is better than that of TP and TN. Therefore, environmental functional materials can be used to treat sewage of high concentration of COD.
Simulation on Solar assisted Air Source Heat Pump Heating System in Rural House by Using TRNSYS
Authors: Ma XiaoXue , Wang Xiaotong 
Published: July 2020

Abstract
According to the simulation software TRNSYS to simulate the Solar assisted Air Source Heat Pump Heating System in a multilayer rural houses in Lanzhou area. By analysis simulation data on solar and air source heat pump as the heat source, providing energy for the low-temperature radiant floor heating, the paper discusses the feasibility and comfort of this system. Based on the solar radiation characteristics, the advantages of this system was given out, developing the building energy efficiency.
Analysis of the voltage jump fault of the reinforced computer program-controlled power supply
Authors: Li Chao 
Published: July 2020

Abstract
During the process of hardening the computer, it was found that the voltage of the program-controlled power supply that was originally set to a voltage value would suddenly jump when the machine was turned on and off. According to this problem, locate the fault. The cause of the final positioning fault is that the software of the program-controlled power supply processor has not set up a signal verification process, which causes the program-controlled power supply to mistakenly consider the changes generated by the RS232 signal when the power is turned on and off as voltage control signals, resulting in voltage jumps. Modify the software of the program-controlled power processor to increase the signal verification when the program-controlled power processor receives the RS232 signal of the main board, which can effectively solve the fault phenomenon.
Research on the Performance Evaluation of Green and Low-Carbon Industrial Development in Gansu Province
Authors: Wang Cuiyun , Quoquan  , Chen Lili , Shang Xueying 
Published: July 2020

Abstract
Having rich natural resources and important strategic location, Gansu province was deployed with a large number of key industries after the liberation of the country. However, most of these industries have high-carbon and high-emission, which not only cause more serious damage to the already fragile ecological environment, but also restrict the green and low-carbon development of industry in Gansu province. Based on the analysis of the status quo of industrial green and low-carbon development in Gansu province, this paper evaluates the performance of industrial green and low-carbon development in recent 10 years, and then puts forward the countermeasures for green and low-carbon development.
A CFD-based simulation study of a double-storey sedimentation tank for drinking water treatment
Authors: Zhang Shuo , Wang Ruhua , Xu Jiajiong 
Published: July 2020

Abstract
CFD is applied to study the effects of geometric factors and particle concentration of double-storey advection sedimentation tank on hydraulic state and particle removal for low turbidity raw water. The results show that the width has a great influence on the particle concentration at the outlet. When the width is 5m, the effluent turbidity can basically meet the design. The impact of hydraulic load on the weir about 3L/s/m on the particle concentration at the outlet is small. When the water depth is shallow, the particle concentration at the outlet increases significantly.
On the Global Rare Earth Elements Utilization and Its Supply-Demand in the Future
Authors: Yan Deru , Ro Sunghyok , Sunam O , Kim Sehun 
Published: July 2020

Abstract
Rare Earth Elements (REE) refers to 17 minerals with similar characteristics. Rare earth is in the limelight as a key material for future industries because of their unique chemical, electrical, magnetic, and luminescent properties and excellent radiological shielding effects. The scarcity of REEs cannot be imagined in the successful execution of the fourth industrial revolution and the sustainable economic development, which is now in front of humanity. Therefore, it is very urgent for each country and each enterprise to understand the global rare earth production situation and take measures against the future prospects. Therefore, the paper first addresses the definition and importance of rare earths and attempts to analyze their reserves, countries and global production in detail. Next, based on the analysis of development trends in the electric vehicle industry, renewable energy and the mordern electronic industries where the use of rare earths is essential, this paper suggests a rare earth supply and demand strategy that can be referred to in the rare earth resources scarce developed countries including Europe.
Impacts of Land Use Change on NDVI in Shaanxi Province of China
Authors: Wang Feng , Liu XiaoKang , Liu Xu , Li Yongfeng , Wang Tao 
Published: July 2020

Abstract
Land use change is one of the main impacts of human activities and has a profound impact on vegetation change. Based on the MODIS normalized difference vegetation index (NDVI) from 2000 to 2018 and land use data in 2000, 2005, 2010, and 2015, the land use and its impacts on NDVI change in the Shaanxi province of China were analyzed. This study showed that the land use structure in Shaanxi province is stable, with forest land, grassland and farmland as the main components. The main feature of land use change from 2000 to 2015 was the large area of farmland converted to construction land, mainly distributed in the Guanzhong Plain in the central Shaanxi province, especially in the vicinity of the capital city of Xi’an. The impact of land use changes on NDVI showed a significant decreasing trend in the area converted to construction land during 2000-2018, while the NDVI for areas converted to forest, farmland and grassland all showed a significant increasing trend. The growth rate of NDVI in the area converted to farmland was higher than in the areas converted to forest land and grassland, the reason for which needs further study.
Study on the variation characteristics of rainstorm and flood in Puyang River Basin
Authors: Hu Haiying , Liu Zhipeng 
Published: July 2020

Abstract
Based on the measured rainfall and runoff data of 6 hydrological stations in the Puyang River Basin for many years, the trend of rainfall and runoff series are analyzed by using the methods of the regression analysis and the Mann-Kendall test in Puyang River Basin. The main conclusions are as follows: The trend analysis results show that the annual maximum 1-hour, 3-hour and 24-hour rainfall series in the Puyang River Basin is basically on the rise, but the flood and runoff series show a downward trend. It reflects that the main reason for the decrease of runoff in the Puyang River Basin is not the climate change. It is likely to be related to the impact of human activities. In summary, under the influence of climate change and human activities, human activities are the main reason for the decrease of runoff in the Puyang River Basin.
Design and Application of Monitoring Station of Black and Odorous Water Body Based on Industrial Computer and Remote Computer
Authors: Ye Long , Yang Shichao , Wu Peihao , Mai Yuebang , Cheng Lihui , Tao Xiaochao , Dang Zhi 
Published: July 2020

Abstract
Monitoring station of black and odorous water body (BOWD) based on industrial computer and remote computer control was designed and built to resolve the time-consuming problem about manual monitoring in the course of supervise of BOWD. Hardware configuration, technological process and software design were researched according to the demand analysis of monitoring station of BOWD. The results indicate that the monitoring station of BOWD can get real-time monitoring data of classification evaluation indexes of BOWD with a good stability, the relative error is below 7.14% between real-time monitoring data and manual monitoring date.
Assessment of water-saving status of civil buildings in Jiangsu Province based on AHP method
Authors: Li Jiaxin , Shen Ronglei , Li Jiarui , Fang Shuying , Zhao Yuechen 
Published: July 2020

Abstract
The shortage of water resources, serious water pollution, and the destruction of aquatic ecology have become important factors restricting the economic and social development of the region. In 2014, General Secretary Xi Jinping stood at the strategic height of sustainable development, and proposed a water management policy of “water conservation priority, space balance, system governance, and two-handed efforts”. Among them, water conservation is given top priority. This article takes Jiangsu Province as an example. It determines the water-saving assessment indicators for civil buildings in Jiangsu Province by reading relevant codes and standards. It is based on the AHP Analytic Hierarchy Process to give weight to each indicator. Through expert scoring, get the score of the current status of water-saving implementation of civil buildings in Jiangsu Province, comprehensively analyze the current status and problems of water conservation in civil buildings in Jiangsu Province, establish a typical water-saving model for buildings, play a demonstration and lead role, and promote the water-saving work of civil buildings in other provinces.
Study on the relationship of ecological effect in the ecological restoration of urban lakes
Authors: Chen Guangrong 
Published: July 2020

Abstract
the combination of biological manipulation and aquatic vegetation restoration had become an important way of ecological restoration of lake water. The research on the relationship among fish, zooplankton and aquatic vegetation was helpful to lake ecological restoration. By investigating the distribution of fish, aquatic vegetation and zooplankton in some urban lakes in the South of the five ridges, the abundance and relative abundance of Cladocera and Copepoda were generally lower in the lakes where fish was farmed, while the abundance of Cladocera and crustacea was relatively higher in lakes with hydrophytes. The ecological restoration of typical tropical shallow urban lake showed that the combination of aquatic vegetation restoration and fish regulation was an effective measure for the control of tropical shallow eutrophication urban lake. It provided a reference for how to take biological control measures to restore the water body and how to maintain the stability of the ecosystem after the ecological restoration.
Comparative Study of Main Meteorological Factors Inside and Outside the Forest of Xianweng Mountain National Forest Park
Authors: Ren Guoli , Yang Xuewen , Wang Xue , Zhang Yaosheng , Li Shengju , Li Lan 
Published: July 2020

Abstract
Investigations of meteorological conditions can reveal the dynamics of microclimates in specific forests. Meteorological factors are necessary factors for quantitative observation and research of forest ecosystems. A systematic analysis of the forest boundary and the main meteorological factors outside the forest in Xianweng Mountain National Forest Park can accurately reveal the interaction between the forest and meteorological factors in Xianweng Mountain National Forest Park. Based on the meteorological observation data of the forest of Xianweng Mountain National Forest Park for three consecutive years, and using experimental methods to locate meteorological factors inside and outside the forest, compare meteorological factors such as atmospheric temperature, relative humidity, precipitation and wind speed, and wind direction, and analyze their different characteristics. The results show that the main reason for the difference in temperature and humidity inside and outside the forest is that the canopy absorbs solar radiation and emits long-wave radiation from the ground. The dense canopy also impedes air exchange inside and outside the forest, reducing wind speeds in the woods. Meteorological factors play an important role in guiding the distribution of forests, and have an important impact on the growth of trees in the forest, the development of trees, and the accumulation of tree biomass. A systematic comparative analysis of the main meteorological factors inside and outside the forest of Xianweng Mountain National Forest Park revealed the interaction between the forest and meteorological factors of Xianweng Mountain National Forest Park. According to the meteorological observation data of Xianweng Mountain National Forest Park, in order to make reasonable use of meteorological resources in the future, to develop forests, to protect the balance of natural ecosystems and their healthy development are of great significance.