bluuebunny/crossref_metadata_2025 huggingface dataset:
Investigation of using U-233 in thorium base instead of conventional fuel in Russian PWR by SERPENT Code
Authors: Hassan A A , Alassaf S H , Savander V I , Afanasyev V V , Abu Sondos M A
Published: December 2020

In this work, the fuel assembly of type TVS-2006, which is used in Russian reactor VVER-1200, is considered. A proposed fuel of Thorium and Uranium-233 ((Th232+U233)O2 has been investigated to replace the fuel currently used (U238 as a fertile and U235 as fissile). This has been done in order to compare the; conversion ratio, reproduction factor (η), burnup, effective delayed neutrons fraction (βeff), Minor Actinides (MA) inventory, and Temperature coefficients of reactivity. The calculations performed using the Monte Carlo code (SERPENT-2.31) to analyze and compare the two fuels. Results showed that using U-233 in the Thorium base will considerably increase the reactivity at the Beginning Of Cycle (BOC), increase the conversion ratio, and burn up. Besides, the safety parameters for the proposed Th-based fuel, in general, lower than that for Low Enriched Uranium (LEU) but still acceptable.
Possibility assessment for production of non-traditional nuclear fuel in thorium blanket of hybrid thermonuclear reactor
Authors: Kulikov G G , Shmelev A N , Kruglikov A E , Apse V A , Kulikov E G
Published: December 2020

The paper aims at studying specific peculiarities in isotope composition of thorium blanket under irradiation by fusion neutron source (FNS) in hybrid thermonuclear reactor (HTR). High-energy (14 MeV) component of neutron spectrum in thorium HTR blanket results in production of non-traditional fissile mixture including not only233U, but also231Pa232U and 234U. Extraction of such non-traditional fuel from spent Th-blanket and its utilization in traditional nuclear power reactors could increase fuel burn-up and strengthen regime of nuclear non-proliferation. The detailed investigations of these positive effects require high-precision neutron-physical analyses of thorium HTR blanket. The results obtained in these investigations are presented in the paper. The following results were obtained: the chosen model of HTR allowed us to form high-energy neutron spectrum in Th-blanket with significant fraction of 14 MeV neutrons; it was evaluated that threshold (n,2n) and (n,3n)-reactions are able to produce significant amounts of non-traditional target isotopes231Pa and232U; it was shown that accumulation of non-traditional target isotopes weakened substantially in depth of Th-blanket. So, it seems reasonable to seek for optimal thickness of Th-blanket and, thus, to find optimal loading of natural thorium.
Diagnostics of coolant boiling onset based on the analysis of fluctuations of thermohydraulic parameters
Authors: Litvintsova Y E , Laouar S , Delov M I , Kuzmenkov D M , Lavrukhin A A , Kutsenko K V
Published: December 2020

When operating heat-exchange facilities, it is of interest to develop methods of diagnostic and prediction for coolant boiling onset. It is known that the surface temperature of a heating element always has stochastic oscillations around an average value, the analysis of such fluctuations will make it possible to predict the change in the heat transfer regimes.

This paper presents the results of an experimental study of temperature fluctuations for an inertial heater and using of method of diagnostic are based on statistical and frequency analysis of temperature fluctuations. It is shown that there is a correlation between the frequency characteristics of heater temperature fluctuations and oscillations in the thermohydraulic parameters of the coolant (temperature, flow, pressure). The obtained results will find application in the development of an automated system for diagnostics the coolant boiling onset in power facilities.
Simulation of 3D hydraulic effects in the IR-8 reactor’s IRT-3M FA using ATHLET code
Authors: Glyva K I , Nikonov S P
Published: December 2020

This article presents the results of the calculated determination of the 3D hydraulic effects in the gaps of the fuel assembly (FA) IRT-3M. Determination 3d hydraulic effects was carried out using the one-dimensional ATHLET code. Previous work has already been done to analyze the test results hydraulic eight- and six-tube FA IRT-3M reactor IR-8. However, it has not been paid attention to the partition of hydraulic structures in the FAs in the gaps between the fuel rods in the sector in accordance with the division of thermal structures. The new improved FA model was created according to model for neutron physics calculations to create coupling calculation further. The total consumption through the FAs of the improved model changed by less than 0.01% from the base model. The obtained differences in the velocities in the flat and angular sectors will make it possible to obtain a more accurate temperature field distribution for estimation of the margin before the onset of surface boiling. The results of this work can be used in determining the permissible power of the IRT type research reactors: IR-8 at NRC KI (Moscow), IRT-MEPHI at NRNU MEPHI (Moscow), IRT-T at TPU (Tomsk) and WWR-SM at INP (Tashkent).
Calculation of VVER MOX pin-cell benchmark with OpenMC code
Authors: Nikalaichyk A , Bahdanovich R
Published: December 2020

This article presents the results of the ‘Weapons-Grade MOX VVER-1000 Neutronics Benchmarks’ calculated with the OpenMC code. The purpose of this work was to master the OpenMC code and adapt it for VVER calculations in order to use it in the research work conducted at the department. Previously the benchmark was calculated with the SAS2H, HELIOS and MCU codes. Cases calculated with the OpenMC code consist of eight fuel variants with a specific sets of reactor conditions which represent normal and off-normal situations. The obtained infinite neutron multiplication factors are consistent with the presented in the benchmark at the level of 0.02% to 4.71%. The best consistency is observed with the HELIOS code, deviations are less than 1.6%. Despite the rather large deviations for some variants, it can be argued that the OpenMC code allows getting close to other codes results and can be used for similar calculations of VVER-1000.
CORIUMSITY program code for the consequences analysis of a severe core melt accident
Authors: Saldikov I S , Bogdanova E V , Pugachev P A , Ryzhov S N , Smirnov A D , Ternovykh M Y , Tikhomirov G V
Published: December 2020

As part of the tasks to improve the nuclear safety of nuclear power plants, a new program code was developed. The CORIUMSITY program code developed, considered in this work, is intended to analyze the scenario in which an accident at a nuclear power plant is simulated with the melting of the core and the formation of the so-called “corium” - a mixture of nuclear and structural materials of the nuclear reactor core, formed as a result of thermal and mechanical impact during an accident. The CORIUMSITY program code, is intended to analyze several scenarios of different accidents, include an accident with reactor core melting. The functions of this code can help in solving many urgent nuclear safety problems. One of the main methods of operation of the CORIUMSITY code algorithms is the matrix exponential method, which consists in using a matrix function of a square matrix, in which as values are used indicators corresponding to nuclides from the CORIUMSITY code database. The program implements an iterative Euler method for solving the system of levels of nuclear fuel burnup. The CORIUMSITY code was verified with benchmark data to assess the accuracy of the calculation.
SKETCH-N/ATHLET coupled calculations using the boundary conditions plugin
Authors: Romanenko V I , Nikonov S P , Zimin V G , Perin Y , Henry R , Velkov K
Published: December 2020

The paper describes recent developments in the multi-physics coupling scheme between the SKETCH-N nodal neutronics code and the best-estimate thermohydraulic code ATHLET v3.2. The boundary conditions plugin was implemented. The verification and validation were performed using the transient of the Kalinin-3 international Benchmark. The simulation results using the boundary conditions plugin show good agreement with experimental data and calculations performed by using SKETCH-N/ATHLET direct calculations. The calculations of the transient “Switch off of one MCP (Main Coolant Pump) at nominal power” is performed applying a simple core thermohydraulic model without taking into account inter-channel mass transfer.
Estimation of Accuracy of the Method of Gamma- Spectrometry for Non-Destructive Control of Gadolinium Content and Uranium Enrichment in Non-Irradiated VVER-type Fuel Pellets
Authors: Stogov Yu V
Published: December 2020

The gamma-spectra of the single (UO2-Gd2O3)-pellets were measured on the planar detector HPLeGe. The measurements of Gd content in (UO2-Gd2O3)-pellets were performed by X-ray fluorescence method. The total count rate in the doublet 42,3 and 43,0 keV Kα1,2-X-rays from Gd was used as a measure of Gd content. In measurements was used241Am as an external radiation source for exciting the doublet 42,3 and 43,0 keV Kα1,2-X-rays from Gd. In order to obtain the calibration dependence of count rate in doublet 42,3 and 43,0 keV from Gd content in (UO2-Gd2O3)-pellets there were used standard (UO2-Gd2O3)-pellets with the known Gd content, density and enrichment. The estimates of influence of deviations of the density of (UO2-Gd2O3)-pellets and Gd content on total count rate in doublet 42,3 and 43,0 keV were performed. The “pure” gamma-spectra (without employing of external radiation source) were used to obtain the data on uranium enrichment of fuel pellets using multigroup gamma-spectra analysis code (MGAU) and additional information about Gd content. The dependence ofS185,7keVS98,43keVfrom Gd content in (UO2-Gd2O3)-pellets is present (the ratio of count rates for two peaks: Eγ=185,7 keV (the measure of235U) and E=98,43 keV (the measure of235,238U).
Tolerant fuel for VVER reactors
Authors: Alhmoud A Z , Kruglov V B , Kruglov A B , Tanash H A
Published: December 2020

The main factor of destruction of fuel rods in accidents with loss of coolant is associated with the vapor-zirconium reaction occurring between the fuel rod shell and the coolant (water). Improving the reliability of fuel cells can be obtained by modifying or replacing the fuel shell, materials that do not interact with the coolant during normal operation and in emergencies. The loss of coolant accident is a design-basis accident in light water reactors. The postulated accident requires an analysis of the double guillotine break in a main primary coolant pipe, which allows the coolant to freely discharge out of the primary system into the containment of the building. In the present work, the heat stored in the active zone of the reactor, the heat capacity of the fuel and the shell temperatures are determined for ATF materials U-10Mo and U3Si2. The calculated values are compared with the usually used fuel UO2. The results showed beneficial effect of using ATF materials. The above quantities are decreased dramatically for ATF, promising to replace UO2 with ATF fuels. This reduces the probabilities of accidents and oxidation in the nuclear reactors. The calculations are done for nuclear power plant, type VVER-1200.
Membrane vesicles nanotheranostic systems: sources, engineering methods, and challenges
Authors: Nie Weidong , Wu Guanghao , Zhong Haizheng , Xie Hai-Yan
Published: December 2020

Extracellular vesicles (EVs) are cell secretory native components with long-circulation, good biocompatibility, and physiologic barriers cross ability. EVs derived from different donor cells inherit varying characteristics and functions from their original cells and are favorable to serve as vectors for diagnosing and treating various diseases. However, EVs nanotheranostics are still in their infancy because of their limited accumulation at lesion sites and compromised therapy efficiency. Hence, engineering modification of EVs is usually needed to further enhance their stability, biological activity, and lesion-targeting capacity. Herein, we overview the characteristics of EVs from different sources, as well as the latest developments of surface engineering and cargo loading methods. We also focus especially on advances in EVs-based disease theranostics. At the end of the review, we predict the obstacles and prospects of the future clinical application of EVs.
High-resolution forest carbon mapping for climate mitigation baselines over the RGGI region, USA
Authors: Tang Hao , Ma Lei , Lister Andrew , O’Neill-Dunne Jarlath , Lu Jiaming , Lamb Rachel L , Dubayah Ralph , Hurtt George
Published: December 2020

Large-scale airborne lidar data collections can be used to generate high-resolution forest aboveground biomass maps at the state level and beyond as demonstrated in early phases of NASA’s Carbon Monitoring System program. While products like aboveground biomass maps derived from these leaf-off lidar datasets each can meet state- or substate-level measurement requirements individually, combining them over multiple jurisdictions does not guarantee the consistency required in forest carbon planning, trading and reporting schemes. In this study, we refine a multi-state level forest carbon monitoring framework that addresses these spatial inconsistencies caused by variability in data quality and modeling techniques. This work is built upon our long term efforts to link airborne lidar, National Agricultural Imagery Program imagery and USDA Forest Service Forest Inventory and Analysis plot measurements for high-resolution forest aboveground biomass mapping. Compared with machine learning algorithms (r
2 = 0.38, bias = −2.3, RMSE = 45.2 Mg ha−1), the use of a linear model is not only able to maintain a good prediction accuracy of aboveground biomass density (r
2 = 0.32, bias = 4.0, RMSE = 49.4 Mg ha−1) but largely mitigates problems related to variability in data quality. Our latest effort has led to the generation of a consistent 30 m pixel forest aboveground carbon map covering 11 states in the Regional Greenhouse Gas Initiative region of the USA. Such an approach can directly contribute to the formation of a cohesive forest carbon accounting system at national and even international levels, especially via future integrations with NASA’s spaceborne lidar missions.
Relationship of surface soil moisture with solar-induced chlorophyll fluorescence and normalized difference vegetation index in different phenological stages: a case study of Northeast China
Authors: Shen Qiu , Liu Leizhen , Zhao Wenhui , Yang Jianhua , Han Xinyi , Tian Feng , Wu Jianjun
Published: December 2020

Solar-induced chlorophyll fluorescence (SIF) is closely related to vegetation photosynthesis, and is considered as a direct and non-invasive indicator of the functional status of photosynthetic machinery; the normalized difference vegetation index (NDVI) can also reflect photosynthetic characteristics. Both are related to surface soil moisture (SSM), which is susceptible to drought, and phenology plays an important role in these vegetation-moisture relationships. Based on a variety of gridded SIF, NDVI, and SSM datasets obtained from satellite sensors, we presented the detailed relationships of SSM with SIF and NDVI in different phenological stages. Results showed that SIF and NDVI were significantly correlated with SSM in different phenological stages, especially during the maturity and senescence stages. For different vegetation types, SIF was more sensitive than NDVI to SSM anomalies in grasslands and forests during the maturity stage and rainfed croplands during the senescence stage. These relationships were regulated by precipitation and mean temperature, and decreased precipitation had the most significant impact when accompanied by increased temperature during the maturity stage or decreased temperature during the senescence stage. Our findings shed light on the role that phenology has in the relationships of SSM with SIF and NDVI on a large scale, which can further improve the understanding of vegetation-moisture relationships.
Integrable discretizations for classical Boussinesq system
Authors: Huang Wenhua , Xue Lingling , Liu Q P
Published: December 2020

In this paper, we propose and study integrable discrete systems related to the classical Boussinesq system. Based on elementary and binary Darboux transformations and associated Bäcklund transformations, both full-discrete systems and semi-discrete systems are constructed. The discrete systems obtained from elementary Darboux transformation are shown to be the discrete systems of relativistic Toda lattice type appeared in the work of Suris (1997) and the ones from binary Darboux transformations are two-component extensions of the lattice potential KdV equation and Kac–van Moerbeke equation. For these discrete systems, their different continuum limits, various interesting reductions and Darboux–Bäcklund transformations are considered. Some solutions such as discrete resonant solitons are also presented.
Exponentially distributed noise—its correlation function and its effect on nonlinear dynamics
Authors: Farah George N , Lindner Benjamin
Published: December 2020

We propose a simple Langevin equation as a generator for a noise process with Laplace-distributed values (pure exponential decays for both positive and negative values of the noise). We calculate explicit expressions for the correlation function, the noise intensity, and the correlation time of this noise process and formulate a scaled version of the generating Langevin equation such that correlation time and variance or correlation time and noise intensity for the desired noise process can be exactly prescribed. We then test the effect of the noise distribution on a classical escape problem: the Kramers rate of an overdamped particle out of the minimum of a cubic potential. We study the problem both for constant variance and constant intensity scalings and compare to an Ornstein–Uhlenbeck process with the same noise parameters. We demonstrate that specifically at weak fluctuations, the Laplace noise induces more frequent escapes than its Gaussian counterpart while at stronger noise the opposite effect is observed.
The luanzhu city in hebei province soil fertility quality evaluation
Authors: Lilin  , Lizhao  , Zhenzhihua
Published: December 2020

This research work in the quality evaluation of soil fertility and soil testing formula, on the basis of continue to enlarge the area of soil soil test and sample points, get more soil nutrient material, based on the test results, combined with previous data, the system analysis to the state of the luanzhou city in hebei province the current situation of the agricultural land soil fertility quality.
Research Progress of Regulated Deficit Irrigation Technology in Watermelon (Citrullus lanatus) Cultivation
Authors: Wang Zeyi , Wang Yingying , Zhang Hengjia
Published: December 2020

Regulated deficit irrigation (RDI) technology provides a new way to solve the contradiction between agricultural water supply-demand and the shortage of water resources. The paper briefly introduces the concept of RDI technology and its water-saving mechanism, and then describes the specific application of RDI technology in watermelon planting and the impact of RDI on watermelon growth dynamics, photosynthetic physiological characteristics, water productivity, and quality. It is concluded that timely and appropriate RDI of watermelon can not only improve the quality of the watermelon and maintain or even increase the yield, but also increase the water use efficiency (WUE). Finally, the main problems existing in the watermelon RDI technology are summarized, and its application is prospected, in order to obtain new results in the follow-up research of watermelon RDI.
Risk Mitigation Measures for Coronavirus Disease 2019
Authors: Lu Yujia , Zhou Ruke , Zhang Heran
Published: December 2020

Since December 2019, Coronavirus disease 2019 (COVID-19) broke out in China and soon spread worldwide. The once-in-a-century pandemic brought unexpected effect on both economy and health globally. Up to August 12, 2020, more than 20 million cases have been diagnosed across nearly 200 countries. In some countries such as the United States and India, confirmed cases are still increasing substantially. However, China, as the most severe one in the early stage of the outbreak, has curbed epidemic and saved lives rapidly. The intention of this review is to discuss effective risk mitigation measures, with the main focus on those applied in China, aiming to provide actionable and achievable guidance for the fight against Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) in the world. We analyzed, evaluated and summarized the crucial strategies, including risk communication, quarantine and isolation, vaccine and antiviral administration. The above risk mitigation measures have proven to be effective in fighting against the epidemic in China. In light of specific conditions, we believe these effective risk mitigation measures can be well applied in other countries. In this paper, we will analyze the solution to control the worldwide pandemic and even the epidemic occurring in the future.
A review of Corona Virus Disease 2019 (COVID-19)
Authors: Xie Renlong
Published: December 2020

Covid-19 is a novel infectious disease caused by coronavirus with symptoms of fever and cough. It is caused by a novel coronavirus (SARS-CoV-2) in Wuhan, China, in December 2019. There are already some medical records in most countries in the world, which has greatly affected the development of the domestic and international economy and social order. The World Health Organization (WHO) has declared a continuous outbreak as a global public health emergency. Since research on it is still in its infancy, no treatment has been found to treat the disease. In this review, we will summarize the clinical manifestations, transmission routes, detection methods, treatment and prevention methods of COVID-19 and future development trends, and may provide some reference for the treatment of the disease.
The Technical Function and Application Exploration of visual concept in environmental engineering projects
Authors: Fang Yin , Zheng Gong , Bo Gu
Published: December 2020

The industrial economy has greatly improved China’s overall strength and the quality of life of its people has also improved significantly. However, the fact that human health is threatened by the natural environment caused by industrial economies cannot be underestimated. In order to solve this universal problem affecting all mankind, different countries have put forward the concepts of energy conservation, emission reduction, ecology and sustainable development, and reached consensus around the world. The paper will study visual concepts to better promote environmental art design for the service of society.
Analysis on the Green Development Model of Urban Agglomeration in China
Authors: Zhang Fang
Published: December 2020

Urban agglomeration is an important carrier to promote China’s economic development. The current development model of urban agglomerations in China has problems such as lack of overall planning, unbalanced development, poor ecological environment, and low quality of human settlements. Based on the analysis of the current development problems of Chinese urban agglomerations, the research puts forward the content of the generalized green urban agglomeration system. The research results have certain theoretical value and practical significance for promoting the transformation of urban agglomeration from traditional to green.
From Green to Healthy, Analysis of Humanistic Strategy under Ecological City Space
Authors: Pan Hongyan , Tang Ziyi , Han Jihong , Sun Hua
Published: December 2020

In recent years, the global ecological environment has further deteriorated. After frequent pollution and public health incidents, we all have higher expectations for the cities in which we live. With the vigorous promotion of green ecological urban areas in China, the country is paying more and more attention to the construction of people’s cities such as ecological environment and healthy cities. This paper constructs a new generation of people-oriented ecological city through three spatial levels of “green and healthy building cells–green and healthy community units–green and healthy urban areas”. Based on the analysis of standards and objectives under different spatial levels of the city, this paper puts forward corresponding human-oriented objectives strategies such as safety, health and wisdom under the concept of “green and healthy”, pays attention to people’s green livability, health and safety in urban areas, communities and architectural spaces, and provides support for the development of the city in the future.
Spatial and temporal variation Trend Analysis of vegetation cover in Urban agglomeration of Pearl River Delta from 2000 to 2015
Authors: Zhang Dong , Wu Fengzhi , Fang Yanzhuo , Lu Ni
Published: December 2020

Based on MODIS NDVI remote sensing data, the methods of regression analysis, CV stability analysis, Hurst exponent analysis are used to invert the spatio-temporal variation trend of vegetation cover in the Pearl River Delta region from 2000 to 2015. On this basis, the future change trend of vegetation cover was predicted. The results indicate that (1) the vegetation coverage in the Pearl River Delta was on a rising trend in general from 2000 to 2015 (0.029/10 years). (2). The vegetation change in The Pearl River Delta region was mainly significantly improved (39.73%), and significantly degraded and slightly degraded areas accounted for only 13.22%, which were staggered with significantly improved regions. (3) Degree of vegetation cover fluctuation in cities and surrounding areas has significant spatial consistency with degraded areas of vegetation cover, which indicates that there is a certain correlation between the change of vegetation cover around the city and human activities. (4) Combined with the analysis of future and past trends, the condition that vegetation cover firstly degrades and then improves will occur. While vegetation degradation may occur in non-urban concentrated areas without good ecological planning. The research results will be helpful to understand the trend and spatial distribution of vegetation in the Pearl River Delta region.
A Review on Green Consumption
Authors: Bian Tiao
Published: December 2020

In environmental protection activities, consumers play an increasingly important role, and green consumption is the embodiment of environmental protection behavior in the consumption field.Although there have been some studies on green consumption at home and abroad, few studies systematically review the related studies on green consumption.On the basis of clarifying the basic concept of green consumption, this paper combs the relevant literature of green consumption from the aspects of the influencing factors of green consumption and the causes of the attitudinal and behavioral differences of green consumption, and discusses the countermeasures for the development of green consumption from the perspectives of consumer enterprises and the government.Finally, the shortcomings and possible future research directions are summarized.
Comparison and analysis of several medical waste treatment technologies
Authors: Xu Lufeng , Dong Kun , Zhang Yiming , Li Haixiang
Published: December 2020

Medical waste is a kind of special waste with great harm. Since the 1950s, the treatment of medical waste has attracted widespread attention from all over the world. At present, scholars at home and abroad are increasingly rich in research on medical waste treatment technology and have achieved certain research results. This article comprehensively compares and analyzes the technical influencing parameters, advantages and disadvantages of incineration treatment, pressure steam sterilization treatment, chemical treatment, microwave treatment, plasma treatment and other medical waste treatment methods, and emphasizes that high-temperature pyrolysis incineration treatment technology has reduced weight and is harmless. This is the current direction of domestic medical waste treatment research and development.
Research Framework of Fresh Agricultural Products Logistics Network Optimization Based on Cold Chain
Authors: He Xu-Dong
Published: December 2020

The paper comprehensively integrates multidisciplinary theoretical knowledge such as complexity network, game theory, ecology, system coordination optimization theory, using mathematical analysis and system model construction and other tools to carry out structural analysis and operation mechanism research on agricultural product cold chain logistics ecosystem. The paper explains the interrelationship between the micro-behaviors of the node members of the cold chain system and the evolution of the macro-structure of the system, reveals the complexity of the evolution of the cold chain logistics ecosystem, and studies the impact of the system coordination mechanism on the optimal decision of the system members. The agricultural product cold chain ecosystem network will be comprehensively coordinated and optimized, thereby ultimately improving the overall performance of the cold chain system.
Prediction of construction waste in representative cities of North and South based on Grey Model
Authors: Wang Peng Fei , Liu Yang , Gao Si Yan , Luo Shaohua , Jia JingJue , Yang Heng , Liu XiaoYu
Published: December 2020

With the orderly promotion of construction waste treatment in China, the process of construction waste reduction is also gradually launched. At present, the production of construction waste in many cities is in the historical high decline stage. In order to better plan the capacity of urban construction waste treatment and recycling, it is necessary to forecast the output of construction waste in a period of time in the future. Based on the historical data from 2012 to 2018 in the statistical yearbook, this paper forecasts the construction waste production from 2020 to 2023 in Shenyang Dalian, the core city of Northeast China, and Guangzhou and Shenzhen, the provincial capitals of Guangdong Province. By comparing the growth trend of population with the growth trend of construction waste, it is found that the growth of construction waste is along with the increase trend of population. Meanwhile, four suggestions for urban waste disposal are provided.
Research on fine management of construction project based on BIM5D technology
Authors: Wu Bei , Cai Yuping , Shi Yansiyi , Gao Zhanwang
Published: December 2020

On the basis of the original BIM technology, the concept of continuous upgrading and development, increasing progress and time has become the latest BIM5D technology, which can not only simulate the appearance of the actual project after completion and make it visually displayed, but also increase the management of progress and cost.By using the latest BIM5D technology, the construction project can shorten the construction period, reduce the cost and ensure the quality, improve the working efficiency of the staff and enhance the competitiveness of the enterprise. Therefore, it is of heart value to study how to combine the BIM5D technology with the detailed study of construction project and how to manage it.
Exploration and Analysis on the way of building green lifestyle
Authors: Yang Lijing , Li Xiaochun
Published: December 2020

The construction of green lifestyle is an important part of practicing General Secretary Xi Jinping’s thought of ecological civilization, and is the content of returning to human ecological life. Reverence for nature in the field of subject cognition is the ideological premise of building a green lifestyle. It is the material foundation of Luther’s lifestyle to integrate the concept of “clear water and green mountains are gold and silver mountains” into the increase of productivity. It is the value pursuit of green lifestyle to focus on people’s free and all-round development. In face of a series of world history problems, building a green lifestyle is the manifestation of “Chinese wisdom”.
Analysis on the New Green Total Factor Productivity of Transportation Industry
Authors: Su Ruijie
Published: December 2020

Combined with the new requirements of high-quality economic development for the transportation industry, this paper improves the total factor productivity(TFP) index system from the perspective of economic, social and environmental factors. This paper selects panel data of 30 provinces and cities in China from 2007 to 2018, uses the Super-efficiency Slack Based Model and GML index to make a comprehensive evaluation and analysis on the change of TFP in China’s transportation industry. The empirical results show that the new green TFP can more objectively reflect the economic growth and technological progress of the transportation industry after the environmental factors and social costs are included in the evaluation system. During the sample study period, the TFP of the transportation industry shows a trend of first decreasing and then significantly increasing. Moreover, the empirical results varies significantly among provinces and regions, and the TFP value of the eastern region is obviously better than that of the central and western regions. Finally, this paper gives policy suggestions on how to promote the high-quality development of transportation industry in different regions.
Research on Remote Sensing Feature Selection and Information Extraction of Urban Construction Waste Based on Jilin-1 Image
Authors: Hong Shu , Chen Qiang , Jia Ziyi , Li Yuanyuan
Published: December 2020

Construction waste generally refers to the waste generated by man-made or natural factors such as new construction, demolition, and repair. It has many characteristics such as discrete distribution, various types, and frequent changes. Conventional survey methods are difficult to obtain construction waste location information quickly and accurately, while information extraction methods based on high-resolution remote sensing images can efficiently acquire construction waste information in a large area. Therefore, this paper uses the domestic Jilin-1 satellite (JL-101A) remote sensing image, based on multi-scale segmentation, and through the method of object-oriented remote sensing feature recognition. This paper regards the Qianxinzhuang Village in Daxing District, Beijing as the study area. And it takes research on information extraction of construction waste in cities. The results show that the optimal segmentation scale of the study area is 74; the overall accuracy of the object-oriented knowledge rule classification method is 88.0%, and the Kappa coefficient is 83.6%. The results show that the object-oriented method based on the domestic Jilin-1 satellite is feasible for information extraction of construction waste, and it has certain significance for the management of construction waste.
Research on the Legitimacy Acquisition of Reverse Logistics for Pharmaceutical Enterprises
Authors: Luo Yumei , Wang Guiping , Li Yuwei
Published: December 2020

How to deal with the recycling of waste drugs, reduce the waste of social resources and environmental pollution, and promote the sustainable development of society and ecology, has become a social concern. But so far, due to the lack of the legitimacy of reverse logistics of waste drugs, pharmaceutical enterprises are faced with many obstacles to realize the business. Based on legitimacy theory, this study adopts panel discussion to identify three types of legitimacy: cognitive, pragmatic and moral, and their importance in the implementation of reverse logistics. We further analyze how pharmaceutical enterprises acquire these legitimacies. The study found that moral legitimacy is the most important and should be acquired first, and then cognitive and pragmatic legitimacy.
Study on Ecological Environment and Ecological Planning of Small Summer Resort Based on User Experience
Authors: Li Ming
Published: December 2020

With the rapid development of tourism, eco-tourism has become an important development direction of tourism. The tourism resources and environmental conditions of small summer resorts determine that small summer resorts are ideal places to develop ecotourism, but the ecological environment of small summer resorts is extremely fragile. Therefore, in the development of ecotourism, the development of small summer resorts must take the protection of ecological environment and ecotourism resources as the premise and the development of ecotourism products as the basic idea. This paper attempts to study the ecological environment and ecological planning of small summer resorts from the perspective of user experience. This paper analyzes the ecological aesthetic characteristics of small summer resorts from the aspects of natural landscape, landscape architecture and ecological environment, in order to broaden the research horizon of small summer resorts. Especially, the plant arrangement and management of small summer resorts are the key to protect the ecological environment of small summer resorts, and must take into account the landscape aesthetics and the natural laws of the ecosystem.
Optimization of defluorination and iron reduction effect of manganese-loaded activated alumina by Response Surface Methodologyology
Authors: You Kun , Gao Yujia , Fu Jinxiang , Kang Ning , Gao Liansong
Published: December 2020

Influenced by geological environment, both fluoride ion and iron ion exceed the standard in underground drinking water sources in some areas. Aiming at this problem, the experiment was designed by Response Surface Methodologyology(RSM). With the goal that fluoride ion in the effluent meets the Standards for Drinking Water quality (GB 5749-2006) and the concentration of iron ion in the effluent drops significantly, the adsorption time, pH value and temperature were taken as independent variables, and the primary and secondary relationship of influencing factors on fluoride and iron reduction of manganese-loaded activated alumina was explored, then the process parameters were optimized. The remarkable relationships are AF(adsorption time)>BF(pH value)>CF(temperature), BFe(pH value) > CFe(temperature)>AFe(adsorption time).Under the conditions of adsorption time 8h, pH value 4 and temperature 25°C, when the mass concentrations of iron and fluorine in raw water are 2mg/L, the removal rates of fluoride and iron can reach 68% and 59.5%, and the mass concentrations of effluent are 0.61mg/L and 0.81mg/L, respectively.
A dimensionality reduction method of power load data based on the combination of VMD-OMP-Kmeans
Authors: Li Tong , Song Jinliang , Chen Jian , Tong Haosong , Jia Cui , Wang Anni
Published: December 2020

With the power data becoming more and more complex, it is of great significance to reduce the dimension and reconstruct the power data for the subsequent processing and application of power big data. This paper presents an algorithm based on variational mode decomposition (VMD) decomposition and orthogonal matching pursuit (OMP) reconstruction to reduce the dimension of power load data. Firstly, VMD method is used to decompose and filter the power load data; Secondly, K-means clustering algorithm is used to synthesize the decomposed data mode into a cluster center data set. Then, the data set is used as a dictionary; Thirdly, an OMP algorithm is proposed to select the elements to be reconstructed in the dictionary. And the corresponding data weights are given to reconstruct the load data with high-precision. As a result, the dimensionality of massive load data is reduced automatically. Finally, this paper builds a flexible load data dimensionality reduction model based on VMD method to verify the proposed method.
Study on heat transfer enhancement of solar finned tube phase change regenerator
Authors: Jiang Jingzhi , Chen Zhengjia , Bo Lin , Cui Haiting , Peng Peiying
Published: December 2020

Based on the problems of heat storage in the process of solar energy utilization and the advantages of finned tube heat exchanger, the finned tube is applied into the solar phase change heat accumulator and the heat storage process of the phase change material is simulated numerically. The results show that the use of finned tube instead of smooth tube in solar phase change heat accumulator can effectively improve the heat transfer intensity of the outside of the tube during phase change heat storage, thus enhancing the heat transfer capacity of the whole heat accumulator and shortening the heat storage time. In the simulation range of this paper, the optimum structure parameter of finned tube is: finned outer diameter of D2=28mm, fins thickness of t=1mm, fins number of c=13, spacing between fins of h=25mm.
Performance and characteristics of methylene blue adsorption using nanomagnetite graphite adsorbent
Authors: Wen Shuangxi , Zhang Juanjuan , Meng Dele , Yang Hongyi , Yang Tongneng , Xiao Mi
Published: December 2020

In this paper, a nanomagnetite graphite adsorbent (MGNP) was developed for removal of methylene blue from aqueous solutions. MGNP was synthesized through the nanographite powder (GNP) functionalized with magnetic γ-Fe2O3 nanoparticles under alkaline conditions and calcining for 3 h at 300 °C. The MGNP featured a quick separation process from solutions with an external magnet. The surface charge of the adsorbent was pH-dependent, the pHpzc of MGNP was approximately 7.2. The methylene blue adsorption isotherm of the MGNP can be well fitted by the Langmuir model, the maximum adsorption capacity was about 114.94 mg/g at 25 °C when pH = 7 ± 0.1. In conclusion, the MGNP could be a potential adsorbent for the uptake of methylene blue from wastewater.
Influence of cooling rate on structure and combustion reactivity of char during char preparation process
Authors: Chi Huanying , Su Sheng , Xiang Jun , Yu Pengfeng , Huang Haizhou , Guo Tingting , Li Hanjian
Published: December 2020

Different chars with various cooling rates were obtained in the novel concentrating photothermal reactor to investigate the influence of cooling rate on the structure and combustion reactivity of char. The chars were prepared at 900°C with holding time of 10s, 30s and 120s, respectively. Subsequently, the cold (ex-situ) chars were prepared from the hot (in-situ) chars by controlling different cooling rates of 180°C/s (fast cooling rate), 30°C/s (sub-fast cooling rate), 6.8°C/s (moderate cooling rate) and 1.3°C/s (slow cooling rate). The ex-situ chars were then employed for the combustion in 30%O2/70%CO2 atmosphere at 900°C for 180s. For comparison, the in-situ char was conducted by instantaneously switching the reaction atmosphere. For the chars with holding time of 10s, the mass fraction of in-situ char was higher than the char yield of ex-situ char, and the char yield was decreased with the decrease of cooling rate. The char yield with slow cooling rate was decreased by 11.16% than that with fast cooling rate. The maximum and average mass loss rate of char in O2/CO2 was decreased as the cooling rate decreased. Reduced influence of cooling rate on the aromatic ring systems of char with holding time of 30s and its reactivity was displayed, while almost no difference of those with holding time of 120s was illustrated. The reactivity was closely related to the chemical structure of the char, but no positive correlation was found between the combustion reactivity and the specific surface area of char. The residues proportion of volatile components was the decisive factor of char reactivity.
Research on Fiscal and Tax Policy to Promote the Development of Low-carbon Economy in Shandong Province
Authors: Zhang Xianghui
Published: December 2020

With the development of economy, energy consumption is increasing, resulting in global temperature warming, which poses a threat to human survival. The energy consumption and economic growth of Shandong Province are in the forefront of our country. How to save energy while promoting economic development and realize the rapid, healthy and sustainable development of economy is a problem worth thinking about. Under the new normal of economy, fiscal and taxation policy plays an important role in promoting the development of low-carbon economy, and it is urgent to explore the fiscal and taxation policy suitable for the development of low-carbon economy in Shandong Province. On the basis of introducing the current situation of fiscal and taxation policies to promote the development of low-carbon economy in Shandong Province, this paper analyses the existing problems of fiscal and taxation policies to promote the development of low-carbon economy in Shandong Province, and puts forward corresponding suggestions. The aim is to promote the development of low-carbon economy in Shandong Province.
Design and Implementation of Mobile Integrated Off-grid Energy Storage Power Supply for Ship
Authors: Zhou Ling Hui , Liu Dan Ya
Published: December 2020

This paper designs a Mobile Integrated Off-grid Energy Storage Power Supply for Ship (Power Bank for Ship). The power bank for ship is mainly used to provide power supply services for ships. It can supply power for daily loads of ships and can also be conveniently charged by the marine electric generator or the charging station onboard.The power bank for ship has the characteristics of high integration, intelligence, two-way power supply and charging. The successful development of this equipment provides new ideas for the realization of clean energy for ships in my country, and has a positive effect on the environmental protection of the Yangtze River and other inland river economic zones.
Exploring the research fronts of low carbon and energy-efficiency in economic environmental development: a scientometric analysis from a multidisciplinary literature
Authors: Pan Chung-Lien , Huang Jieqi , Zhou Xiaobing , Chen Zizhen , Chen Zixuan , Chen Ziyao , Yu Yilin
Published: December 2020

In the increasingly severe global economic environment, low-carbon and energy efficiency have become a hot topic in contemporary times. In order to provide low-carbon and energy efficiency at the forefront of economic and environmental development, this article is based on 192 data retrieved from the Web of Science (WoS) database. This article conducted a comprehensive data and visualization analysis on keywords such as “low-carbon economy” and “low-carbon development”.
The development trend and problems of Chinese condiments
Authors: Zhou Yilun , Xiangning Chen
Published: December 2020

After more than 20 years of accumulation, Chinese condiment market has achieved considerable development. While the market scale and output are expanding year by year, condiments are also changing from traditional to compound and functional segmentation. The condiment market will also become more concentrated, and the speed of introducing new technologies will accelerate, shifting toward a more consumer-friendly direction. However, there are also some problems during the development. This article lists some of the problems exposed by the development of the condiment market and proposes some improvement measures.
Effects of exogenous ABA on the physiological characteristics and chlorophyll fluorescence of Gynura cusimbua seedlings under drought stress
Authors: Cai Lujuan , Feng Yingying
Published: December 2020

This paper is to investigate the physiological mechanism of exogenous abscisic acid (ABA) on alleviating drought stress in Gynura cusimbua The effects of exogenous ABA on physiological characteristics and chlorophyll fluorescence parameters of the leaves of Gynura cusimbua under drought stress were studied with 10% polyethylene glycol 6000 (PEG 6000) in simulated drought stress. The results showed that the activities of antioxidant enzymes and some fluorescence parameters increased slightly after spraying exogenous ABA. Under drought stress, exogenous ABA can increase chlorophyll content, enhance antioxidant enzyme activity, reduce MDA content, increase maximum photochemical efficiency Fv / FM, regulatory energy dissipation Y (NPQ), photochemical quenching QL, actual quantum efficiency Y (II), non-photochemical quenching NPQ fluorescence parameters, and reduce non-regulatory energy dissipation Y (NO) and minimum fluorescence Fo parameters, so as to reduce the damage to seedlings under drought stress. Among them, the ABA concentration of 200 μmol/L was the best to alleviate 10% drought stress.