bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design of Face QR Code Recognition System based on PCA
Authors: Tan Linglong , Wu Fengzhi , Wang Qing 
Published: June 2021

Abstract
This article discusses the face two-dimensional code recognition technology, using the PCA algorithm to study the dimensionality reduction processing process of the face image. Based on the analysis of QR encoding and decoding methods, the generation of face two-dimensional codes is realized. Choose 140 pictures in ORL face database as the experimental data set, study the face two-dimensional code recognition system, and realize a process of face recognition. The experimental results show that the face image data has a large dimension, and the principal component analysis method can be used to obtain the key data. Through the experiment, PCA can be used to reduce the dimensionality to obtain the effective information of the face, and to encode and decode the two-dimensional code. The ZXing two-dimensional code open source library called by the experiment has high experimental efficiency, which is beneficial to improve the operating efficiency of face two-dimensional code recognition and facilitate the machine to complete the simulation.
Image Compression and Reconstruction Based on PCA
Authors: Tan Linglong , Wu Fengzhi , Li Weilong 
Published: June 2021

Abstract
In view of the disadvantages of large image space, high dimension of feature representation and large storage, this paper uses principal component analysis to compress the data, which can effectively reduce the loss of information, reduce the dimension of data and extract features in all aspects of image compression. In this paper, based on the analysis of PCA algorithm dimension reduction, reconstruction, feature extraction principle, the PCA algorithm is applied to image compression and reconstruction. Through the principal component analysis of sample variables, the feature vector of sample variance is calculated, and its principal component is extracted, and the contribution rate is calculated to realize image PCA compression. By extracting different eigenvalues from the original image and calculating its compression ratio and contribution rate, we can see that the clarity of the image is positively correlated with the value of the eigenvalue, and the larger the value of the eigenvalue, the higher the contribution rate. PCA based image processing technology is simple to use, high compression rate and high quality of image reconstruction, which is unmatched by many other methods.
Research on Mathematical Model of Strip Slip during Speed Increase of the Bridle Roll of SPM
Authors: Wang Yong-Qiang , Li Yang-Long , Wen Jie , Yu Meng , Li Gong-Yin 
Published: June 2021

Abstract
When the strip slip occurs during the speed-up process of SPM, there is the relative slippage between the strip and the bridle roll. It will cause the fluctuation of rolling force, elongation and tension of SPM, which are harmful to the strip surface quality and stable operation. For the sake of researching the mechanism of relative slipping happens between the bridle roll and strip when the speed of the skin pass mill (SPM) is increased, a mathematical model for relative sliding between the strip steel and the bridle roll was built. At the same time, a quantitative parameter named “the strip slip risk ratio” was proposed. On the basis of this model, a lot of factors that affect the slip were analyzed, such as friction coefficient, front and rear tension, velocity, acceleration, coiling angle and etc. The results show that increasing friction coefficient, decreasing tension difference, decreasing velocity and acceleration will reduce the slip risk of sliding strip. According to the calculation results, the controllable influencing factors for strip slipping were optimized. The roughness of bridle roll was increased from 4 to 5 microns. The tension difference of bridle assembly at the outlet of SPM was decreased by 50% and the strip acceleration of SPM was reduced from 0.6 to 0.5 m/s2. After application of measures, the monthly incidence of strip slipping is obviously reduced. The incidence of strip slipping per month is reduced from about 3.33% to 0.17%, which prevents the slip between strip and the bridle roll during the speeding process of SPM.
Adaptive Probabilistic Broadcasting for Floating Content
Authors: Shuai X Y , Zhang B , Yin Y X 
Published: June 2021

Abstract
Floating Content (FC) is emerged by bounded geographical zone in a mobile ad hoc network (MANET) to live in the anchor zone (AZ) for special applications such as emergency messages and traffic information for some time. To improve the availability, accessibility and reduce the number of FC duplication, the adaptive probabilistic broadcasting for FC (APFC) based on the number of neighbours and the informed node location is proposed. When a node without FC enters the transmission radius of informed node that is with FC. By exchanged message with the new node, the informed node obtains the information of the new node and its own neighbours. The informed node calculates the transmission probability p based on the collected neighbour information. Then the node automatically selects whether to use APFC or broadcast the FC according to the current position. The algorithm is simulated in different randomly networks. The results show that this algorithm outperforms other broadcasting algorithms in FC duplication.
Virtual Technology in New Media
Authors: Wu Qixiang , He Lin 
Published: June 2021

Abstract
Virtual technology and new media blend with each other and continue to collide, adding different fun to our lives. The interactive design in virtual technology allows people to see the world in the eyes of new media more realistically, making art closer to life and making the picture more vivid and vivid. The new media environment also makes virtual technology useful. It is no longer a tall thing in the eyes of ordinary people, so that ordinary people can also feel the changes that this technology brings to life. With the impact of the digital information age, people can quickly meet their needs for information and accelerate their pace of life; and in the process of impact, art and data blend with each other to form a new art form of new media art. This article focuses on the application of virtual technology in the field of new media. By establishing a new media database model and combining the interactive functions of virtual technology, the necessity of integration of virtual technology and new media is proposed. The data shows that 300 packets are sent per second, each packet size is 600bites (these can be set in the configuration file), the bandwidth of the transmitted data is 0.81Mb / s, and the upper crosshead model is obtained. The results show that many functions of virtual technology are applied in the field of new media.
Shrub growth in the Alps diverges from air temperature since the 1990s
Authors: Francon Loïc , Corona Christophe , Till-Bottraud Irène , Choler Philippe , Roussel Erwan , Carlson Bradley Z , Morin Samuel , Girard Brigitte , Stoffel Markus 
Published: June 2021

Abstract
In the European Alps, air temperature has increased almost twice as much as the global average over the last century and, as a corollary, snow cover duration has decreased substantially. In the Arctic, dendroecological studies have evidenced that shrub growth is highly sensitive to temperature—this phenomenon has often been linked to shrub expansion and ecosystem greening. Yet, the impacts of climate change on mountain shrub radial growth have not been studied with a comparable level of detail so far. Moreover, dendroecological studies performed in mountain environments did not account for the potential modulation and/or buffering of global warming impacts by topography, despite its possible crucial role in complex alpine environments. To fill this gap, we analyzed a network of eight sites dominated by the dwarf shrub Rhododendron ferrugineum. The sites selected for analysis represent the diversity of continentality, elevation and slope aspect that can be found across the French Alps. We quantified annual radial increment growth for 119 individuals, assembled meteorological reanalyzes specifically accounting for topographic effects (elevation, slope and aspect) and assessed climate-growth relations using a mixed modeling approach. In agreement with a vast majority of dendroecological work conducted in alpine and arctic environments, we find that the number of growing degree days during the snow-free period snow-free growing degree days (SFGDDs) is a strong and consistent driver of R. ferrugineum growth across all sites since 1960 until the late 1980s. We also document a marked loss of sensitivity of radial growth to increasing SFGDD since the 1990s, with this decoupling being more pronounced at the driest sites. Our observations of the spatial and temporal variability of shrub sensitivity to limiting factors can be compared to the ‘divergence’ problem observed in tree-ring series from circumpolar and alpine regions and, accordingly, sheds light on possible future trajectories of alpine shrub growth in response to ongoing climate change.
Holistic energy efficient design approach to sustainable building using monitored energy management system
Authors: Buzatu R , Muntean D , Ungureanu V , Ciutina A , Gireadă M , Vitan D 
Published: June 2021

Abstract
Building sector focuses on surpassing challenges linked to energy efficiency and mitigation measures related to greenhouse gas emissions, in consequence, it needs to improve building performance in the interest of decreasing impact over environment. Buildings with reduced long-term operating cost, environmental-friendly and moderate construction costs can be achieved only by multi-object optimization and cross-disciplinary analysis, embodying a holistic approach. Following the main principles of the holistic sustainable design approach, the paper presents a sustainable experimental modular laboratory involving various strategy in regard with sustainable building, as resource, cost and material efficiency, health and well-being, environmentally conscious design, life cycle design, modular design, reusable/recyclable element, environment-friendly demolition method, safety design, consideration of life cycle cost, materials cost and waste disposal cost. Besides the installation of renewable energy sources and conservation of energy, the holistic construction of laboratory included also an integrated design with consideration for technology, operation and maintenance, which involved the implementation of a monitored energy management system. The system provides an accurate overview of the building’s performance during operational phase. Although the monitoring is still in an incipient phase, recordings showed promising results regarding the behaviour of recycled-PET thermal wadding used for insulation and indoor comfort conditions.
Review of an innovative thermal and economic model of a thermal solar source
Authors: Dragne H , Iordache F 
Published: June 2021

Abstract
This paper presents an innovative calculation method that simplifies the present calculation in the existing Romanian solar methodology, but also brings a new approach to the problem of determining the actual efficiency of a heating system using solar panels during the actual hours of sunshine. This new method will also make better economical estimations by including a new calculation method that is adapted strictly to solar panels applications. Both proposed methods, include a new approach of determining the thermal and economic indicators faster or more precise. The results shown in this article, validate the new calculation method and offer new perspectives on real-time hourly solar system performance evaluation. Those results show that although the actual hourly efficiency of the solar panels increases over a small period of time, daily system efficiency that includes the consumer’s heating needs, decreases due to the limitation of the required thermal energy over a longer period of time that exceeds those sunshine hours. This paper provides a new vision regarding the way solar systems are treated and suggests some adjustments that need to be made in calculating the solar systems. Thus, due to a considerably higher heat input over a given period of the day, it is concluded that these systems work much better in the case of extra storage of this energy (larger storage tank) or by adjusting the indoor temperatures (through automation) during this solar charging regime.
The influence of characteristics of aggregates on performance of asphalt mixtures
Authors: Ene N M , Răcănel C 
Published: June 2021

Abstract
Under the current conditions of road traffic growth, importance should be given to the use of construction products whose technical characteristics have to be tested and to comply with the regulations in force. In our country at present there is the European standard EN 13043:2003 regarding the conditions that natural and artificial aggregates must meet in order to be used in asphalt mixtures. As is well known, these conditions are presented in the form of categories of values to be set by the designer to result in an asphalt mix with certain characteristics. However, this standard does not contain a national annex with specifications on the aggregate categories depending on the type of asphalt mix correlated with the technical class / road / street technical category. The majority of beneficiaries that use aggregates in the production of asphalt mixtures have problems on the national market because there is no correlation between this standard and the national provisions in force, namely the AND 605/2016 (version in force on this date). This paper analyzes the conditions that the natural aggregates for the bituminous mixtures must have and correlates the performance of the aggregates with the performance of the asphalt mix.
Shared energy storage market operation mechanism to promote new energy consumption
Authors: Zhang Xinlin , Zhang Yanchi , Zhao Yuzhuo , Chen Dong , Li He , Xie Da 
Published: June 2021

Abstract
The configuration of energy storage helps to promote renewable energy consumption, but the high cost of energy storage becomes a major factor limiting its development. Through shared energy storage, the utilization rate of energy storage can be improved and the recovery of energy storage investment costs can be accelerated. This paper first introduces the application scenarios of the proposed shared energy storage, then analyzes the characteristics of shared energy storage. Furthermore, the transaction process between new energy and shared energy storage is put forward, and the clearing model of shared energy storage market is established. To minimize the consumption cost of new energy generators by coordinating the sharing of idle energy storage capacity. Finally, the proposed method is verified through examples to analyze the benefits of shared energy storage for investors and new energy generators, as well as the changes in new energy consumption.
System simulation of air-cooling single effect LiBr absorption refrigerating system driven by solar heat source
Authors: Zhou Yu , Yan Guihuan , Wang Xu , Hui Xiaoyang , Xu Chongqing , Han Tao 
Published: June 2021

Abstract
Air-cooling single-effect absorption refrigeration system has the characteristics of water saving, space saving and maintenance cost compared with water-cooling. In order to study the characteristics of air-cooled system, this paper uses Aspen Plus to build an air-cooled single-effect LiBr absorption refrigeration system with a cooling capacity of 23kW and adiabatic evaporation and adiabatic absorption, and the influence of temperature on the system at different condensing temperatures is studied. The results show that with the increase of generating temperature, the load increase of solution heat exchanger gradually slows down and then becomes faster, while the load increase of other equipment gradually slows down. After the system COP value rises to a certain value, it basically remains unchanged.
Optimization Analysis of AVC Adjustment Strategy for Power System with Large-scale Wind Power
Authors: Liu Jin , Li Tong , Xu Mingyu , Chen Xiaoguang , Hu Yuanting , Mu Xinghua , Liu Zhiyang 
Published: June 2021

Abstract
As a kind of economical and clean renewable energy, wind power generation is more and more widely used. Wind power plants are far away from the load center and the output power is highly random. Therefore, the control of reactive power, voltage and network loss at public connection points are more difficult. The automatic voltage control system uses the real-time operating data of the power grid to select the best reactive voltage control scheme from the perspective of the entire system. It takes the voltage safety and quality as the conditional limit, takes the economy of the system as the goal, and optimizes the voltage in real-time control. This article gives a control strategy for the problem of inability to smooth transition and repeated oscillations in the signal processing of the abnormal state of the AVC system. The upper and lower limit planes of voltage and reactive power are divided into 27 areas, and each area corresponds to different control strategies. This method can be used to achieve smooth transition of control strategy, real-time voltage optimization control.
Research on Risk Assessment Techniques of Offshore Wind Power Projects during Operation Period
Authors: Liu Baozhan , Jin Weiwei , Zhao Jianping , Zhang Qinfan , An Wei 
Published: June 2021

Abstract
In light of the complex operating environment and high maintenance cost of offshore wind power projects, a risk evaluation system is established in accordance with the risk’s features and sources during the operation period of offshore wind power projects. On grounds of the risk evaluation system, a risk assessment method for offshore wind power projects during the operation period is put forward based on the multi-level fuzzy comprehensive evaluation method, and a specific project in the South China Sea is evaluated with the assessment model. The results showed that the risk probability is moderate to low, the consequences of the hazards are moderate, and the comprehensive risk rating is moderate for the assessed project during the operation period. It is necessary to follow the ALARP (As Low As Reasonably Practicable) principle to mitigate the risk. The risk level of offshore wind farms during the operation period can be judged using the evaluation method to provide technical support for prevention and emergency response of the accidents related to the offshore wind power projects.
Experimental study on pressure fluctuation characteristics of model pump in Huangjinxia hydro-junction
Authors: Dong Peng 
Published: June 2021

Abstract
In this study, the pressure pulsation characteristics of different position in the model pump unit are studied by experiments in combination with the Huangjinxia hydro-junction. The pressure pulsation of the inlet pipe, the volute outlet and the area between impeller and guide vane under different operating conditions were measured and analyzed. The results show that the maximum pressure pulsation amplitude of the pump is less than the guaranteed values by comparing the test results with the value requirement of the pump, which ensures the safe and stable operation of the pump. FFT transform is used to analyze the main frequency and amplitude of pressure pulsation. The main frequency and secondary frequency at the impeller inlet are respectively 15.29 and 7.65 times of the rotating frequency, which are 2 and 1 times of the blade frequency. The amplitude of main frequency at each monitoring point increases with the increase of head. The test results of pressure pulsation value meet the requirements of the contract in the whole pump operation rang.
Numerical Analysis of Wind Wake Superposition and Boundary Layer Interaction
Authors: Barasa Maulidi , Li Xuemin , Zhang Yi , Xu Weiming 
Published: June 2021

Abstract
Understanding the wake impacts to a wind farm is critical for layout planning and turbine design. Wind Wake Models estimates wake development through a single turbine which is then aggregated with a wake variety of methods to calculate the combined wake profile for a wind farm. This study considered downstream wake interactions, and the energy content in the wake profile as the wake developed for three rows and five downstream turbines. This study also looks at the influence of different atmospheric stratifications to wind farm wake superposition. Our findings for the wake and boundary superimposition model determine that the streamwise velocity component range from 8.8 to 9.0 m s-1 (98 to 100 %) for the stable ABL ranges and 8.92 to 9.0 m s-1 (99 to 100 %) for the unstable ABL ranges. This study further determines that the minimum streamwise velocity for the stable and unstable ABL are 8.97 and 8.96 m s-1, and the mean normalized velocity deficit for the stable and unstable ABL are 0.972 and 0.975. The wake deficit for the superimposition of a coupled wake boundary model in the stable case surpasses that of the unstable case due to lower turbulence.
Safety analysis and forecast of new energy vehicle fire accident
Authors: Xiaoggang Wang , Futang Xing , Guixin Shi , Yue Huang 
Published: June 2021

Abstract
In recent years, due to the aggravation of air pollution and the exhaustion of coal and oil resources, new energy vehicles have achieved rapid development. However, new energy vehicles have many hidden dangers. Spontaneous combustion, explosion and other accidents often occur all over the world, which restrict the development of new energy vehicles. In this paper, the fault tree analysis method is used to qualitatively analyse the new energy vehicle, the accident diagram is obtained, the importance of each basic event is analysed, and the fuzzy decision method is used to predict the fire accident of new energy vehicle.
Application techniques for micro capsules on energy security: A case study on Class B fire
Authors: Dong Yan , Zhao Chen Yu , Lv Xiao Zhe , Zhang Tian Wei , Zhang Cun Wei 
Published: June 2021

Abstract
At present, with the rapid development of the national economy, China’s demand for energy is becoming stronger. It is particularly important to develop an efficient and environmentally friendly fire extinguishing agent to ensure energy security. As a new type of environmentally friendly fire extinguishing agent, dry water has the advantages of both water mist and dry powder fire extinguishing agent. The core-shell structure of dry water fire extinguishing agent makes it have fluidity and dispersibility similar to powder fire extinguishing agent, while maintaining extremely high-water content, making it of great application value in the field of fire extinguishing agents. In this paper, the preparation, physical and chemical properties of dry water extinguishing agents and the fire extinguishing performance of Class B fires are studied, based on the existing fire extinguishing theories and experimental results, the fire extinguishing mechanism of dry water extinguishing agents is discussed.