bluuebunny/crossref_metadata_2025 huggingface dataset:
Author Correction: In-plane selective area InSb–Al nanowire quantum networks
Authors: Op het Veld Roy L. M. , Xu Di , Schaller Vanessa , Verheijen Marcel A. , Peters Stan M. E. , Jung Jason , Tong Chuyao , Wang Qingzhen , de Moor Michiel W. A. , Hesselmann Bart , Vermeulen Kiefer , Bommer Jouri D. S. , Lee Joon Sue , Sarikov Andrey , Pendharkar Mihir , Marzegalli Anna , Koelling Sebastian , Kouwenhoven Leo P. , Miglio Leo , Palmstrøm Chris J. , Zhang Hao , Bakkers Erik P. A. M.
Published: March 2021

A Correction to this paper has been published: https://doi.org/10.1038/s42005-021-00578-4
Marine ammonia-oxidising archaea and bacteria occupy distinct iron and copper niches
Authors: Shafiee Roxana T , Diver Poppy J , Snow Joseph T , Zhang Qiong , Rickaby Rosalind E M
Published: March 2021

Ammonia oxidation by archaea and bacteria (AOA and AOB), is the first step of nitrification in the oceans. As AOA have an ammonium affinity 200-fold higher than AOB isolates, the chemical niche allowing AOB to persist in the oligotrophic ocean remains unclear. Here we show that marine isolates, Nitrosopumilus maritimus strain SCM1 (AOA) and Nitrosococcus oceani strain C-107 (AOB) have contrasting physiologies in response to the trace metals iron (Fe) and copper (Cu), holding potential implications for their niche separation in the oceans. A greater affinity for unchelated Fe may allow AOB to inhabit shallower, euphotic waters where ammonium supply is high, but competition for Fe is rife. In contrast to AOB, AOA isolates have a greater affinity and toxicity threshold for unchelated Cu providing additional explanation to the greater success of AOA in the marine environment where Cu availability can be highly variable. Using comparative genomics, we predict that the proteomic and metal transport basis giving rise to contrasting physiologies in isolates is widespread across phylogenetically diverse marine AOA and AOB that are not yet available in pure culture. Our results develop the testable hypothesis that ammonia oxidation may be limited by Cu in large tracts of the open ocean and suggest a relatively earlier emergence of AOB than AOA when considered in the context of evolving trace metal availabilities over geologic time.
Emerging investigator series: prompt response of estuarine denitrifying bacterial communities to copper nanoparticles at relevant environmental concentrations
Authors: Costa Joana , Sousa António G. G. , Carneiro Ana Carolina , Mucha Ana Paula , Almeida C. Marisa R. , Magalhães Catarina , Baptista Mafalda S.
Published: March 2021

In estuaries the deposition of copper nanoparticles upon sediments can contribute to change metal availability and promote the transcriptional response of denitrifying bacteria.
Physicochemical characterization and the hypoglycemia effects of polysaccharide isolated from Passiflora edulis Sims peel
Authors: Guan Yuan , Sun Hefei , Chen Huiying , Li Peijun , Shan Yang , Li Xia
Published: March 2021

One polysaccharide, designated as WPEP-A, was isolated from Passiflora edulis Sims peel. Our results showed that WPEP-A had hypoglycemic activity and improved intestinal function in diabetic mice, which may contribute to the attenuation of the hypoglycemia effects.
Time-dependent communication between multiple amino acids during protein folding
Authors: Chong Song-Ho , Ham Sihyun
Published: March 2021

Cooperativity in contact formation among multiple amino acids starts to develop upon entering the folding transition path and attains a maximum at the folding transition state, providing the molecular origin of the two-state folding behavior.
Transformation of random lasing to Fabry–Perot lasing: observation of high temperature lasing from carbon dots
Authors: Ni Yiqun , Li Xiangyang , Liang Wenqing , Zhang Shaofeng , Xu Xuesong , Li Zhenyuan , Li Ling , Shao Yonghong , Ruan Shuangchen , Zhang Wenfei
Published: March 2021

Red emissive random lasing at 612 nm was realized from a planar microcavity using CDs as the gain medium at room temperature. Simultaneously, the transformation of random lasing to Fabry–Perot lasing in the same laser cavity at 250 °C was observed.
Purpurin derivatives as visible-light photosensitizers for 3D printing and valuable biological applications
Authors: Sautrot-Ba Pauline , Brezová Vlasta , Malval Jean-Pierre , Chiappone Annalisa , Breloy Louise , Abbad-Andaloussi Samir , Versace Davy-Louis
Published: March 2021

Synthesis of new visible-light absorbing purpurin derivatives as promising photosensitizers for 3D photoprinting and anti-adhesion properties.
Hollow carbon-based nanosystem for photoacoustic imaging-guided hydrogenothermal therapy in the second near-infrared window
Authors: Jia Zhuo , Dai Rong , Zheng Ziliang , Qin Yufei , Duan Ailin , Peng Xiaoyang , Xie Xianmei , Zhang Ruiping
Published: March 2021

We have developed a novel nanotheranostic platform (HC-AB NPs) via loading ammonia borane (AB) into hollow carbon nanoparticles (HCs) for NIR-II photoacoustic (PA) imaging-guided NIR-II hydrogenothermal therapy.
Vitamin C assisted synthesis of rGO–Ag/PANI nanocomposites for improved photocatalytic degradation of pharmaceutical wastes
Authors: Sravya S. , RamaDevi Dharmasoth , Belachew Neway , Rao K. Eswara , Basavaiah K.
Published: March 2021

A highly efficient visible light active polyaniline (PANI)/Ag composites grafted reduced graphene oxide (rGO–Ag/PANI) was prepared for the efficient photocatalytic degradation of paracetamol.
A modified XY model of transformer oil–paper insulation system including non‐uniform aging and conductance effect
Authors: Fan Xianhao , Liu Jiefeng , Zhang Yiyi , Yang Shichang , Zhang Chaohai , Zhang Yubo
Published: March 2021

The accuracy and feasibility of the traditional XY model of transformer oil–paper insulation system are disputable since it ignored the effect of non‐uniform aging and conductance on dielectric response property. Given this issue, this work attempted to report a modified XY model to overcome these defects. The novelty of this work is in the exploration of the modified XY model as a potential tool for establishing the quantitative correlation among the complex relative permittivity of the liquid insulation, solid insulation, and liquid–solid composite insulation. In that respect, the presented verification experiments proved the feasibility and accuracy of the reported model. The contributions are expected to provide a theoretical basis for the condition evaluation of transformer solid insulation under non‐uniform aging conditions.
Hazard evaluation of ground potential difference within grounding grid on personal safety under impulse current
Authors: Li Chun , Wen Xishan , Guo Lei , Chen Jiafeng , Chen Jiahao , Lu Hailiang
Published: March 2021

Due to the impedance characteristic of conductor, the ground potential rise is different within grounding grid when impulse current is injected. When staff touches objects with different GPR at the same time, the GPD will be applied to human body, leading to potential personal safety problem. The impact of GPD on human body needs to be evaluated. The method of moment was used to calculate the ground potential rise of grounding grid under impulse current. By regarding the human body as a resistance, the current flowing through it because of ground potential difference was obtained. Methods based on current amplitude and electrical charge was used to evaluate personal safety. The effects of injecting current waveform, injecting position, soil resistivity, grounding conductor and grounding grid structure on ground potential difference and safe current threshold were studied. Results show the ground potential difference near injecting point may pose a threat to personal safety. The evaluation method based on electrical charge was recommended. In field test, the injecting point of grounding grid should be far away from corners, and staff should be kept away from the injecting point, so as to mitigate the risk of ground potential difference on personal safety.
Research on Evaluation Method of Cost Management and Control Effect of Power Transmission and Transformation Project Based on BIM Technology
Authors: Duo Zhang , Zhengping Wang , Chenlei Yin
Published: March 2021

The power transmission and transformation project is the carrier of power energy transmission and plays an important role in supporting economic development and improving people's living standards. Based on the application status of BIM technology and the actual situation in power transmission and transformation projects, this paper combs the application fields of BIM technology from the perspective of the whole process of project construction, and constructs an index system based on the construction effect of the whole process of the project. The analytic hierarchy process is used to calculate the index weights, and the expert scoring method is used to evaluate the effects of different projects according to the actual situation, so as to enhance the application scope of BIM technology in the construction of power transmission and transformation projects. The research results of this paper can provide support and reference for the establishment of a construction digital model covering the entire process and resources of a power project, and a BIM system suitable for the power industry.
Multiphysics simulation of a solid oxide fuel cell based on COMSOL method
Authors: Yaoxuan Qiao , Cheng Fan , Kening Sun
Published: March 2021

Solid oxide fuel cells (SOFCs) are promising high-effective energy conversion devices for wide fuel sources and high energy efficiency. Based on non-linear kinetics at triple-phase-boundary, a three-dimensional model with a single flow channel was constructed. Distribution of mass flow, temperature and current density in a different configuration and working conditions were investigated. Critical factors in voltage output, power output, and reactant utilizations were determined. It is concluded that increasing temperature can give better performances. The increase of inlet flow results in an increased of power density but a decrease of fuel utilization efficiency. The numerical simulation provides a scientific basis for control strategy and structural design of SOFC.
Construction and verification of an environment and energy prediction model for Controlled Environment Housing
Authors: Yang Li , Du Longhuan , Yang Chaowu , Hu Chenming , Yu Chunlin , Du Huarui , Li Qingyun
Published: March 2021

In order to satisfy the healthy growth and performance of livestock and poultry, a large amount of energy is often consumed in the production process of modern livestock and poultry breeding, which is used for automatic feeding management and regulation of breeding environment. In this study, based on the ISO 13790 5R1C equivalent resistance capacitance network computing model, using the henhouse heat balance, water balance, balance of gas (ammonia, carbon dioxide concentration) principle, we developed a simple closed loop control henhouse environment and energy consumption prediction model, Through on-site validation tests, the results show that the model is reliable, and it can assist the farmer for breeding planning, house-design process and increase environmental control and energy management efficiency.
The Impact of the Reform of Factor Market-oriented Allocation on Grid Companies and Related Suggestions
Authors: Wei Zhu , Xinling Wang , Haolan Li
Published: March 2021

On April 9, 2020, the CPC Central Committee and the State Council issued “Opinions on Building a More Complete System and Mechanism for Market-oriented Allocation of Factors” (hereinafter referred to as the Opinions), which made an important deployment to promote the five production factors to achieve a higher level of market-oriented allocation. As the key link of power allocation, Grid Companies are directly related to the economic and social development of the whole country. This paper analyzes the main contents of the opinions in detail, studies the impact of the opinions on power network planning and construction, labor employment, capital operation, technological innovation, the development of emerging industries of Grid Companies, and puts forward targeted suggestions to provide theoretical support for the development of Grid Companies.
International Trends Analysis for Subject of Hydrogen Production with Water Electrolysis
Authors: Pengfei Fei , Chao Zhang
Published: March 2021

Abstracts

Since the 21st century, the domestic and foreign energy structure has been deeply adjusted and therefore the study about hydrogen production with water electrolysis becomes a hotspot. This paper makes bibliometric analysis for related indexes in the field of hydrogen production with water electrolysis, for example, output scale of articles, academic influence, discipline layout, and international cooperation, and compares China’s strength with other countries around the world to obtain development trend of the technology in the world, thus formulating related development strategy and discipline policy for the technology and providing useful reference for corporate investment decision-making and researchers in selecting research direction.
Study on drag reduction of flexible structure under flows
Authors: Song Jixiang , Chen Weimin , Yan Dingbang , Guo Shuangxi
Published: March 2021

Flexible structures are common in nature and engineering. Under the action of fluid, the flexible structure bends to reduce drag. The study of this phenomenon has important scientific and engineering significance, so this article conducts research. Firstly, the differential equations are established, then solved by numerical methods, and finally numerically simulated.
Metal-organic Frameworks as a Robust Biocatalysis Platform for Enzymatic Production of Biodiesel
Authors: Liu Xinlong , Liu Peng , An Na , Liu Chen
Published: March 2021

Metal–organic frameworks (MOFs) are an attractive class of hybrid materials with metal clusters and organic linkers. The unusual properties of MOFs, such as permanent nanoscale porosity, high surface area, uniformly structured cavities and the availability of in-pore functionality and outer-surface modification, are advantageous using as lipase immobilization platform. Herein, we covalent immobilized CALB onto MOFs and then evaluated the biocatalyst performance in the esterification of oleic acid with methanol for biodiesel production. Experimental data about the methanolysis process was evaluated by response surface methodology. The highest yield of 98.9 ± 0.4% was obtained under the optimized conditions: methanol/oil ratio of 3.65:1, a reaction temperature of 46.3 °C, a CALB@MOF loading of 117.77 mg and a reaction time of 11.55 h, which was closed to the predicted value (100.00%). Verification experiment confirmed the validity of the predicted model.
Simulation Evaluation of Fast Frequency Response Capacity of New Energy Power Stations
Authors: Wanzheng Chang , Nan Wang , Yan Cheng , Shumin Sun , Yanzhuo Wang , Qinghua Li , Zhihao Zhang
Published: March 2021

The number of new energy power stations in China is boosting in recent years, a large number of conventional power supplies have been replaced, resulting in severe problems in controlling the frequency of power grids and easily leading to frequency issues of the state power grid. When large frequency disturbance occurs in power grid, renewable energy stations can participate in primary frequency regulation of power grid and provide support for system frequency, and the primary frequency regulation capability of the large power grid in sending end is significantly enhanced. In this study, a simulation evaluation method was proposed for the FFR controller of new energy power stations based on the RT-LAB real-time simulation analysis platform. The FFR controller was connected to in the simulation model of the state power grid via I/O physical interfaces and MODBUS communication, so as to conduct the step disturbance test, anti-disturbance performance verification test and automatic generation control (AGC) coordination test and hardware-in-the-loop simulation test of the controller. Results of the tests proved that the test method proposed in this study is accurate and reliable, and help improve the performance of a new energy power station in the state power grid.
Defect-states Passivation Strategy in Perovskite Solar Cells
Authors: Hu Hongrui
Published: March 2021

In the modern era, energy demand rises dramatically accompanied by the rapid growth of our population, causing urgent energy shortages and environmental issues around the globe. People turned their attention to solar energy for an eco-friendly and economic solution, in which, perovskite solar cells emerged and had caught a great deal of attention in the past decades for their promising and commercial development potential. To fully release their capability for a high-performance device, defect mechanisms which are one of the main factors inhibiting the efficiency and stability, as well as passivation strategies must be thoroughly studied. In this review, the concept and formation mechanism of the defects are summarized, the corresponding defect characterization techniques regarding their working principles and downsides were also compared. Furthermore, substantial passivation strategies were discussed. Although perovskite solar cells still have a long way to go, facing difficulties in a lot of other aspects, we believe that the research we are doing now is of great significance in making perovskite into a real application.
Numerical simulation study of oil diffusion at low tide near the port area of Ma’ao, Zhoushan
Authors: Dong Junyan , Tang Zhibo , Zeng Hao , Mei Zhihu , Hang Ruishan , Chen Lei
Published: March 2021

In this paper, the numerical hydrodynamic simulation has been carried out by using measured topographic data and related tidal information. The oil particle tracking module of MIKE21 is adopted to study the processes of drifting and turbulent diffusion of oil particles on the water surface, where four working conditions, namely, static wind, dominant wind direction, maximum wind direction and most unfavourable wind direction, are applied. Results show that Xiushan Island will be the apparent ‘victim’ in the cases of oil spill in all wind directions. Meanwhile, due to the existence of Changbai Island and Xiushan Island, the diffusion process of oil particles is obviously retarded to impact the protected marine areas.
Research on the Impact of External Situation on Power Grid Project Investment
Authors: Yufeng Chai , Xin Tian , Xiaoling Jin
Published: March 2021

In recent years, China sees complicated and volatile external situation and growing downward pressure on the domestic economy. Moreover, COVID-19 has adversely affected China's economic and social development. In such context, the Company, as the great strength and strong pillar, reduces the energy consumption cost for three consecutive years. Besides, uncertain factors in terms of power grid development investment have brought about larger impact on the demand and capacity of power grid project investment and proposed higher requirements on the Company. Externally, economic and social development, national strategic deployment, implementation of power supply planning and planned load, and trans-provincial and trans-regional power trading mechanism have a crucial impact on the actual operating benefits of power grid projects.
Research on the coordinated optimization operation method of Park Comprehensive Energy System Based on master-slave game
Authors: Xu Nan , Zhou Bo , Nie Jing , Song Yan , Zhao Zihao
Published: March 2021

With the transformation of the energy market from the traditional vertical integrated structure to the interactive competitive structure, the distributed characteristics of the energy system become more and more obvious, and the traditional centralized optimization method is difficult to reveal the interaction between the multi-agent. In this paper, a method based on master-slave game is proposed to optimize the operation of park integrated energy system. Firstly, user load model, user benefit model, operator revenue and cost model are established for park integrated energy system. Secondly, the Stackelberg master-slave game model of interactive optimization operation is established, and the peak cutting compensation price is adjusted. Both of them aim at maximizing their own interests until the game equilibrium is achieved. A distributed cooperative optimization model with one master and many slaves is established and solved by the combination of genetic algorithm and quadratic programming. Finally, an example is given to verify the effectiveness of the proposed method.
Experimental determination of deviation factor of natural gas in natural gas reservoir with high CO2 content
Authors: Zhang Guofang , Chen Taoping , Wang Fuping , Sun Boyu , Wang Yong , Hou Dali
Published: March 2021

The deviation factor of natural gas is a coefficient to quantitatively describe the deviation degree between real gas (natural gas) and ideal gas. Generally, the deviation factor of natural gas is measured in PVT cell without considering porous media. However, when natural gas is in underground porous media reservoir, due to the adsorption of porous media, the deviation factor of natural gas in porous media deviates from that measured in conventional PVT cell. Moreover, compared with other gases, CO2 has stronger adsorption capacity. Therefore, in porous media, the deviation factor of natural gas considering the adsorption of porous media is quite different from that measured in conventional PVT cell. In this paper, simulating the isothermal mining conditions in gas reservoir,the deviation factor of natural gas with different CO2 content considering the influence of porous media under different pressure isothermal conditions is studied by using the test of designed sand filled long slim tube in series. And under the same conditions, the deviation factor is compared with that of conventional PVT. The experimental results show that under the same conditions, due to the adsorption of porous media, the deviation factor measured in porous media is smaller than that measured by PVT cell without considering porous media.
Research on Dynamic Monitoring and Early Warning Model of Fund for Power Grid Infrastructure Projects
Authors: Gao Qian , Han Yuchun , Yang Junyi , Zhang Guiqin , Hong Yu , Ding Cheng , Cao Weijie
Published: March 2021

In order to strengthen the all-round and whole process management and control of the project, improve the quality of statistical data, support the high-quality development of the company and power grid, and identify the mismatch between the progress of fund payment and the progress of project site construction and cost accounting. Through the research on the dynamic monitoring and early warning model of power grid infrastructure project funds, the problems existing in the fund settlement and payment management of power grid project in the process of project implementation are accurately revealed, and the project fund payment risk is prevented.
Comparative Analysis of Equity Financing Efficiency between Chinese and American New Energy Vehicle Listed Enterprises
Authors: Li Mo
Published: March 2021

Under the dual pressure of global energy crisis and environmental problems, the exploration and application of new energy is an inevitable trend of economic development. Therefore, the development and research on equity financing efficiency of new energy vehicle listed companies appear to be of great value. From the perspective of equity financing efficiency, this paper explores the development status of new energy vehicle listed companies in the current era. Different from previous literature studies, we select China and the United States for comparative analysis and attempts to put forward strategic suggestions. Our paper adopts the DEA model, which is an equity financing efficiency evaluation model, to comprehensively evaluate the effectiveness of new energy listed enterprises, and then compares the equity financing efficiency of Chinese and American enterprises. Later, suggestions are provided on how to optimize the equity financing efficiency and development of new energy vehicle listed enterprises in China according to the found problems and conclusions.
Overview of leaching remediation of heavy metal contamination in soil
Authors: Shuang Cui , Qing Han , Tianyi Zhang
Published: March 2021

The remediation methods of heavy metal contaminated soil can be divided into bioremediation, physical remediation and chemical remediation. Chemical remediation mainly includes soil leaching and chemical curing. There are two kinds of soil leaching remediation methods: in situ soil leaching remediation and ectopic leaching remediation. The eluent of heavy metals in soil includes inorganic eluent, chelating agent, surfactant and so on. Soil leaching can be applied to the remediation of contaminated soil alone or combined with other remediation methods.
Structural Optimization and Experimental Research of High-rise Guyed Tower
Authors: Jing Wu , Junke Han , Fang Ye , Wenyan Qi , Jinshan Yu , Peng Wei , Haijun Xing
Published: March 2021

In this paper, the structural optimization of high-rise guyed tower is carried out for the guyed wire and tower column schemes. The schemes are compared from the four guyed wires and eight guyed wires, the width of the tower column, the uniform cross-section tower column and the variable cross-section tower column, etc. And the single-column tower with eight guyed wires and variable cross-section is recommended for the high-rise guyed tower. Through the full-scale test study of the high-rise guyed tower, the safety of the high-rise guyed tower structural optimization and the feasibility of engineering application are verified. According to the technical and economic analysis of traditional self-supporting towers and high-rise guyed towers recommended in this paper, it can be seen that the weight and total cost of the high-rise guyed towers are 75.3% and 88.5% of the traditional self-supporting towers respectively, demonstrating the technical and economic advantages of the high-rise guyed towers. The advantages and disadvantages of high-rise guyed towers and self-supporting towers are summarized for reference in engineering design.
Research Progress on Phenotypic Plasticity of Invasive Plants in Response to Drought Stress
Authors: Wang Zhe , Cai Xiaojie , Yin Zhiyi
Published: March 2021

Biological invasion seriously threatens ecological stability and social development. One of the bases for forming invasion is alien species’ strong phenotypic plasticity. Phenotypic plasticity can help alien species adapt to environmental changes and enhance their invasive ability. China is one of the countries seriously affected by drought. Under the background of environmental drought, exploring the reasons why invasive plants can gain growth advantages and mastering the phenotypic changes of invasive plants in response to drought stress are conducive to helping us understand more about the invasion mechanism of invasive species. In this paper, the research progresses of invasive plants’ morphological plasticity and physiological plasticity under drought stress in recent years are reviewed, the invasive plants’ morphological and physiological metabolic characteristics under drought are summarized, and the growth advantages of invasive plants are discussed, which provided a scientific theoretical basis for alleviating the serious harm caused by biological invasion to China’s natural environment.
Coastal City Environmental Protection and Governance: Reviewing Residents’ Recycling of Renewable Resources for Waste Management in China
Authors: Shih Sheng-Feng , Lin Meng-Chen , Lin Li-Fen
Published: March 2021

China’s coastal cities have vigorously promoted environmental protection of urban garbage classification system, and the construction process of renewable resources recovery system is still in a state of slow development. This study starts from the residents’ awareness and daily behavior of renewable resources utilization. Through in-depth interviews and questionnaire survey, we can get a better grasp of the awareness and behavior of renewable resources recovery from the interviews, and make more systematic and comprehensive statistics on residents’ understanding of renewable resources related issues from the questionnaire. In addition to the difficulties in management, capital, personnel and technology, urban residents are not active enough in recycling renewable resources in their daily life. Therefore, renewable resources are a new kind of human resources. The rational use of "waste" can not only solve the environmental problems, but also solve the resource problems, so as to achieve a win-win situation. In today’s society, the concept of circular economy ecosystem has been gradually introduced into the mechanism of economic operation. The construction of renewable resources recycling system has become an important part of circular economy strategy.
Analysis of the Spatial and Temporal Variation Characteristics of Ozone in the Pearl River Delta Region from 2016 to 2020
Authors: Chuntao Huang , Jifu Lu , Qifeng Liao
Published: March 2021

Based on the historical data of air ozone monitoring of Pearl River Delta from 2016 to 2020, the temporal and spatial variation characteristics of ozone in the Pearl River Delta were analyzed. The results showed that the mean change curves of Q3 in the seven cities in the Pearl River Delta region from 2016 to 2020 were M-shaped, and the change trend was basically the same, except Huizhou and Zhuhai. The over standard rate of daily mean value of Q3 in Jiangmen City from 2016 to 2020 was more than 10%, and the over standard situation of daily mean value of Q3 was serious. In the Pearl River Delta region, the change trend of the monthly mean value of Q3 in the same year was basically the same. On the whole, the mean value from August to November was higher, and the mean value in June was lower. The peak of Q3 concentration appeared between 12:00 and 16:00 in the daytime, and it was generally low at night.
Accuracy analysis and verification of the method for calculation of geodetic problem on earth ellipsoid surface
Authors: Dong Jian , Ji Hongchao , Tang Lulu , Peng Rencan , Zhang Zhiqiang
Published: March 2021

The method for calculation of geodetic problem on earth ellipsoid surface is the basic premise for the realization of high-precision marine delimitation technology. Based on the analysis of the construction principle of the existing solution of geodetic problem method, the algorithm for direct geodetic problem solution(DGPS) based on nested coefficient method and Bessel’s inverse geodetic problem solution(IGPS), which are suitable for various distance solutions, are optimized. Then, the experimental verification scheme of the solution of geodetic problem is designed. Finally, the crossing and reducing accuracy of different calculation examples are verified by different geodetic problem solution methods, and the experiment shows that: the verified accuracy of point-position plotting, distance calculation and azimuth calculation meet the requirements of the indexes of high-precision marine delimitation.
Research on the sustainable use of Zhenjiang’s industrial building heritage under the green concept
Authors: Si Hongwei , Qin Weiwei
Published: March 2021

The industrial architectural heritage of Zhenjiang has unrepeatable technological and cultural art values. This paper fully understands and scientifically evaluates the characteristics and values of industrial architectural heritage, analyzes different sustainable utilization strategies for industrial architectural heritage under the guidance of green concept, and gives corresponding design and measures for conservation and utilization of industrial architectural heritage.
Environmental Hydrochemical Characteristics of a Dam Site of a Hydropower Station and its Influence on the Project
Authors: Wang Ze
Published: March 2021

Environmental water’s corrosion evaluation of concrete (structure), steel bars and steel structures in reinforced concrete structures is an item of engineering investigation. Therefore, environmental water samples are used for water chemical composition testing during the investigation and carried out according to regulations. Evaluation is very necessary. Taking the Lai Hydropower Station dam site as an example, through the test results of the chemical composition of the water samples, the environmental water and engineering-related chemical characteristics are analyzed, and the corresponding corrosiveness evaluation is carried out according to the requirements of relevant standards, and the surface water and groundwater concrete (structure) is corrosive, indicating the degree of influence on the project. This paper also provide a basis for the project to take protective measures and put forward protecting measures recommendations.
Social Exclusion and Switching Behaviour of Green Products: The Mediating role of Control Demand
Authors: Dong Zhijia , Qiu Xiaodong
Published: March 2021

This study examined the impact of social exclusion and green product conversion behaviour. One study has conducted the result showed that consumers who experienced social exclusion showed more switching behaviour of green product than those who not feel excluded. This effect is mediated by the control demand, while the individual’s self-construction type plays a moderate role.
Application of the circle beauty in the environmental design of Lin-gang Special Area of Shanghai
Authors: Ge Hongbo
Published: March 2021

Dishui Lake, an artificially excavated circular lake, has become a landmark landform in the Lin gang Special Area of Shanghai. It contains the green ecological concept of the harmony between human and nature at the beginning of the design, and establishes a relatively perfect lighthouse coordinate for the grand blueprint of the Lin-gang Special Area. This paper takes the application of circle in environmental design as the breakthrough point, and uses the similarities of Qinglong Town site for reference, and expounds the application of the beauty of circle in environmental design to show the concept of green ecology, so as to provide an accurate connection between sea and land for the excellent cultural inheritance of the Chinese nation.
P-Cu alloy as anode materials for lithium ion batteries: a first-principles study
Authors: Huang Zhaowen , Chen Benjing , Li Jingyang , Zhao Lingzhi
Published: March 2021

In this paper, based on the first principle method, the mechanism of lithium intercalation and deintercalation of P-Cu alloy as anode material of lithium-ion battery was studied. The results followed that the volume expansion coefficient of Li-P-Cu is small, 59.4650% for Li2PCu3 and 61.4071% for Li2P2Cu, indicating that the introduction of Cu can effectively inhibit the volume expansion of phosphorus. And PCu3 is superior to P2Cu in terms of volume expansion coefficient and lithium intercalation formation energy and good conductivity.
Rapid determination of iodine content in drinking water by isopropyl sensitization and inductively coupled plasma mass spectrometry (ICP-MS)
Authors: Zeng Yanxia , Zhu Xiashi
Published: March 2021

A subject for the rapid determination of iodine content in drinking water by isopropyl sensitization and ICP-MS was established. The samples were dissolved in 1% ammonia solution,127I was selected as the mass number to be measured and159Tb as an internal standard. At the same time, 4% (V/V) isopropanol was used to enhance aerosol gasification efficiency, 2% NH3·H2O was used to effectively eliminate memory effects of iodine by cleaning sample for 180 seconds. The results show that, the detection limits of iodine in this method are 0.007 mg·kg-1and it is superior to other literature. The standard curve has a good linear relationship and the recovery rates of testing rusults range are from 96.00% to 112.3%. The content of iodine in standard substance water samples was determined by ICP-MS method. The iodine content in water samples from seven drinking water sources in Lianyungang area was analyzed between 14~21 μg·L-1. It was in line with the allowable value of 10~300 μg·L-1of the sanitary standard for drinking water, suggesting that the iodine content of drinking water resources in Lianyungang area was in a safe range.
Analysis of improved cleaning process targeting tough spot around the yogurt filling machine
Authors: Yan Gu , Longtao Zhao
Published: March 2021

The dairy industry produces sterilized room temperature yogurt. In the process of water flushing filling machine of valves ABC structure, the milk pressed by the seal ring of plunger valve A cannot be cleaned for a long time, causing scaling and increasing the risk of pollution. In order to avoid the risk, the filling machine need to be manually disassembled and cleaned which takes more than 4 hours, resulting in great loss of efficiency. This paper integrates the aseptic tank technology and filling technology of China Mengniu Dairy Company Limited. On this basis, the cleaning process of the sterile[1] normal temperature yogurt filling machine is improved, the technology of water flushing valve A is innovated. It solves the problem of milk scale caused by the pressing of ring of valve A which is hard to clean, therefore minimizes the risk of microbial contamination. The improved process has been tested and applied to sterilized normal temperature yoghurt. The risk control of pollution products with high pectin fiber and even the filling machine with steam barrier structure in food industry is also applicable, which has certain promotion value.
Optimization of the preparation process of rice quinoa gel by response surface methodology
Authors: Yilun Zhou , Xiaoguang Feng , Xiangning Chen , Fushi Zhao
Published: March 2021

Rice noodles is a common food, but it is faced with the characteristics of hard texture and poor nutrition after aging. Quinoa is rich in dietary fiber and nutritious and can enrich the color and taste of rice noodles. In this paper, red quinoa is used as an additive, gelatinization time, quinoa added amount, and water added are selected as influencing factors on a single factor basis, and the hardness of rice quinoa gel is used as the response value to carry out experiments to optimize rice quinoa gelling Glue production process. The results show that the best process is: gelatinization time 30min, quinoa addition amount 30%, material to water ratio 1:2 (g/mL). The test product of this formula has uniform color, uniform gel, strong aroma, good taste and fine mouthfeel.
Analysis on heat transfer and start-up performance of mercury heat pipe
Authors: Zhang Xiuxiang , He Kang , Yang Quan , Xi Chengcai
Published: March 2021

Mercury heat pipe has the advantages of good thermal stability and low saturated vapor pressure, which is the best choice for the transition from water heat pipe to liquid metal heat pipe. The effects of heating power and heat pipe structure on start-up time and steady-state heat transfer performance of mercury heat pipe were studied by using transient thermal network model. The results showed that: 1) Increasing the length of condenser is beneficial to reducing the start-up time and thermal resistance; 2) Increasing the heating power or wall thickness will reduce the thermal resistance, but increase the start-up time, and increasing the porosity of wick is just the opposite; 3) Increasing the thickness of wick can increase both the start-up time and the thermal resistance.
Thermal performance comparison of Rankine cycle, reheat cycle and regenerative cycle with the same initial and final parameters
Authors: Wang Yarong , Wang Peirong
Published: March 2021

The conversion between thermal energy and mechanical energy can be realized through the thermal cycle of working medium in a series of power plants. For the thermodynamic analysis of the thermal cycle, it mainly analyzes the thermal efficiency and steam consumption rate of the cycle to analyze the main factors affecting the thermal efficiency of the cycle, and the measures to improve the thermal efficiency, in order to reduce the fuel consumption and reduce the power generation cost.
Determination of Cysteine by Discoloration Spectrophotometry using Copper(II)-Bis-Cyclohexanone Oxalydihydrazone
Authors: Tu Changqing , Wen Xinrong
Published: March 2021

In the alkaline medium of pH=9.18, Cu2+ can be reduced to Cu+ by the sulfhydryl (-SH) of cysteine, and it result in the decrease the amount of Cu2+ in the system. The decrement of Cu2+ is directly proportional to the addition of cysteine, then using bis-cyclohexanone oxalyldihydrazone (BCO) as chromogenic reagent for Cu2+ to determinate the content of cysteine indirectly by discoloration spectrophotometry. A new method for the determination of cysteine by discoloration spectrophotometry using Copper(II)-BCO has been established. The influencing factors of the determination of cysteine is investigated. The results show that the maximum absorption wavelength of chromogenic system was 602 nm, in the range of 0.008000~0.06800 mg/mL, the linear relationship between the decrease of absorbance and the mass concentration of methimazol is A=0.2162+2.4824C (mg/mL), and the linear correlation coefficient is r=0.9959. The method has been applied to the determination of cysteine in food, and the results are basically consistent with those determined by pharmacopoeial method.
The impact of challenge-hindrance stressors on creativity: the mediating role of regulatory focus and the moderating role of proactive personality
Authors: Yang Yixin , Zhou Mingjian
Published: March 2021

Based on the challenge-hindrance stressors framework and regulatory focus theory, this study explored the mediating role of promotion focus between challenge stressors and employee creativity, and the mediating role of prevention focus between hindrance stressors and creativity. In addition, we further explored the moderating role of proactive personality in this model. In the end, we discuss implications and limitations of our argument for theory and practices.
Impact of Perception of Performance Appraisal Politics on Affective Commitment: Mediate Effect of Perception of Organizational Support and Differentiation Effect of Perception Attribution
Authors: Zhen-qi Jiao , Guang-jin Zhang
Published: March 2021

Performance appraisal politics is widespread in the organization. It provides a new perspective for improving performance appraisal to study its effects on employee attitudes. In addition, its influence on employees’ attitude is still blank. This paper utilizes questionnaire survey and structural equation model to study the impact of different types of perception of performance appraisal politics on employees’ affective commitment. The result shows that different types of perception of performance appraisal politics have different effect on employees’ attitude. Perception of public-private concerned high ratings has positive effect, however, perception of organizational-interested low ratings, selfish high rating perception and self-interested low rating perception have negative effect. The effect strength was decided by employee’s attribution about perception of performance appraisal politics. Perception of organizational support played a complete mediate role in the impact of perception of performance appraisal politics on employees’ affective commitment. Based on the findings of the study, managers can reduce employees’ negative perception of performance appraisal politics and passive consequences by restricting estimators’ selfish leniency and conscious oppressive evaluation, guiding employees to attribute performance appraisal politics positively and enhancing perception of organizational support.
Humanitarian logistics and emergency relief management: hot perspectives and its optimization approach
Authors: Zhang Linlin , Cui Na
Published: March 2021

Post-disaster humanitarian relief is full of importance, complexity and difficulty, which makes people pay more attentions to various disaster relief measures and emergency management practices related to disaster preventions and reductions. The main purpose of humanitarian relief is to protect the lives of the victims in the affected areas and provide victims with the indispensable relief materials to survive from the unexpected disaster. Therefore, this paper puts its focus on some key decisions raised in the process of post-disaster humanitarian relief activities and summarizes the state-of-the-art researches in the area of critical emergency facility location, relief material allocation, emergency vehicle routing and the incorporation of the interests of the victims in the modeling framework. Specifically, through the analysis, this paper draws some key questions that can be further explored in the current research, in order to lay the foundation for the follow-up research, and can better serve the emergency rescue transportation practice under disaster conditions.
Research on the Integration of Ideological and Political Elements in the Course “Database Technology and Application”
Authors: Liu Yuan
Published: March 2021

In the course of curriculum ideological and political integrated teaching concept design process, the main basis is “Living morality and fostering people”, which has a positive role in promoting the development of Chinese higher education. To this end, relevant staff should integrate ideological politics and daily course teaching. This article summarizes the curriculum teaching objectives and curriculum ideological and political objectives based on previous work experience. The author discusses the integration of ideological and political elements in the course “Database Technology and Application” from seven aspects. They including top-level design and planning, revision of curriculum syllabus, reform practice and promotion, “database security maintenance” teaching ideology and politics, “database integrity” teaching ideology and politics, ideological and political improvement of teacher construction, and ideological and political realization of teaching process.
A Study on Students’ Autonomous Learning Ability, Teacher-student Interaction and Its Influence on Academic Development during the COVID-19 Epidemic
Authors: Sun Xiaotian
Published: March 2021

During the COVID-19 epidemic in 2020, online teaching was in full swing. However, due to a variety of factors, there are significant differences in students’ academic development at this stage. This paper collects the experience and evaluation of undergraduate students’ learning ability, teacher-student interaction and academic development in this context. It is found that students’ autonomous learning ability has a significant effect on their academic development, compared with little effect on teacher-student interaction. Based on these results, this paper puts forward some suggestions on the evaluation system of teachers and the guidance of students’ autonomous learning.