bluuebunny/crossref_metadata_2025 huggingface dataset:
Digital Twins of Building Physics Experimental Laboratory Setups for Effective E-learning
Authors: Johra Hicham , Petrova Ekaterina Aleksandrova , Rohde Lasse , Pomianowski Michal Zbigniew
Published: December 2021

Hands-on experiments in laboratories are fundamental educational tools for technical sciences. However, laboratories are expensive and not always accessible to students: lockdown and in-person meeting restrictions due to the ongoing Covid-19 pandemic, distant location of teachers and students, facilities used for higher-priority purposes. Moreover, creating specific experimental setups for teaching only can be costly. In that context, digitalizing laboratory setups provides an attractive teaching alternative for remote e-learning. Digital twins are not meant to replace real-world experiments but should enable flexible teaching and effective learning at a lower cost. They complement physical setups and can be virtual extensions, allowing for larger and more complex study cases. e-learning is now popular and many educational institutions provide open-access videos of entire courses. However, the digitalization of practical exercises for engineering is yet limited. The e-learning effort presented in this paper aims to establish a series of digital twins of experimental setups for teaching building physics, energy in buildings and indoor environment. The development of the two first digital twins is detailed here. They are designed for teaching operation and balancing hydronic heating systems. Their numerical models and graphical user interfaces are created with the LabVIEW programming environment.
A monitoring system for evaluation of COVID-19 infection risk
Authors: Telicko Jevgenis , Vidulejs Daniels Dagis , Jakovics Andris
Published: December 2021

Monitoring systems allow operators to accomplish the greatest comfort indoors, but, as a rule, the available parameters are not enough to analyse the epidemiological threat in buildings. Due to the pandemic and increasing incidence of the disease, there is a need for monitoring systems that can provide the necessary information to analyse the risk of infection. With timely notification of people about the risks, such a system could not only increase safety in buildings, but also save crucial resources such as the work of medical personnel. This paper presents an example of real-world implementation of a cheap and scalable system to indicate risks and inform people inside. To achieve this, an appropriate set of sensors and communication protocols was selected, and processing of indirect measurements with artificial intelligence (AI) algorithms was carried out on an embedded Jetson Nano computer. Based on the experiments and a review of the literature, the necessary parameters for measurements were selected. Detailed analysis of measured data for risk evaluation is provided in [1].
Assessment of moisture and mould of hempcrete and straw panels
Authors: Raamets Jane , Lokko Laura , Ruus Aime , Kalamees Targo , Muoni Karin
Published: December 2021

At present buildings contribute a third of total greenhouse gas emissions. There is a need for sustainable solutions and natural materials, which offer low-embodied energy and their low impact has a promising potential as construction alternatives. Hempcrete is a lightweight insulation material, which provides natural, airtight, and vapor-permeable insulation. Straw panels are also natural construction materials and they consist of extruded wheat straw and are surrounded with recycled paper on all sides. There are some risks, which can be associated with the use of such materials - infestation, biological degradation, presence of moisture, and structural degradation. The aim of the study is to determine the critical moisture level and mould resistance of hempcrete and straw panels. The results of this study are valuable to both scientists and structural engineers.
Thermo-optical reaction changes of a PCM filled glass system
Authors: Cabanová T , Kuruc M , Čurpek J , Urbán D , Čekon M
Published: December 2021

This paper analyzes thermo-optical reactions of the PCM-based glass element which has the capability to store thermal energy together with a variable transparency level through the energy storage process corresponding to phase change. Optical properties are determined by the level of phase transition at given boundary conditions over time. Special uncommon thermo-optical changes occur during its internal phase transition processes, from liquid to solid phase and vice versa (latent heat of fusion) within a given narrow range of temperature interval. PCM acts as random and diffusive media with relevant scattering effects in solid phase, however in liquid state are highly transparent with direct transmission and no relevant scattering effect. These internal physical changes were detailly identified by experimental test procedures based on optical properties measurements performed using a spectrophotometry, and parallelly with the stabilization of each temperature set provided by environmental chamber. As result of that, relevant differences in the PCM spectral feature can be identified for its different states (solid/liquid) in which transmittance spectra are unstable during rapid phase change process. This provides a substantial base line for the optimization of a PCM glazing system in terms of various degree of freedom for different building types and climate zones.
Development of High Performance Aerogel Concrete (HPAC) and statistical evaluation of compressive strength for practical use in construction
Authors: Fickler S , Welsch T , Schnellenbach-Held M
Published: December 2021

The Institute for Structural Concrete (ISC) at the University of Duisburg-Essen and the Institute of Materials Research of the German Aerospace Center (DLR) developed a new lightweight concrete, called “High Performance Aerogel Concrete” (HPAC). HPAC is made by embedding of silica aerogel granules in a high strength cement matrix. It exhibits a remarkable relation between compressive strength and thermal conductivity. HPAC for the load bearing layer of double-leaf external walls contains approx. 50 vol% aerogel and has a compressive strength in the range of normal concrete (20 MPa – 30 MPa). Up to now, the compressive strength of each mixture was determined on three to six cubes or cylinders. The scattering of the results has not been investigated yet. For this reason, 30 test specimens of a 50 vol%-mixture have been produced in two batches. The results of the compressive strength tests were then statistically evaluated. The underlying statistical distribution was determined by the Anderson-Darling-Test. Subsequently the 5 % fractile values of the mixtures, which represent the characteristic concrete compressive strength, were determined.
Thermal resistance of the ventilated air-spaces behind external claddings; theoretical definition and a parametric study
Authors: Rahiminejad M , Khovalyg D
Published: December 2021

The presence of a ventilated air cavity between the external cladding and the wall core of a wall assembly can have a varying contribution to the thermal performance of the building envelope. In particular, the thermal resistance of a ventilated air-space is a dynamic parameter that is influenced by various thermo-physical parameters. In this study, a theoretical definition of the thermal resistance of a ventilated air-space behind an external cladding is introduced, employing a non-linear network of thermal resistances in the air-space. A numerical code is developed for the steady-state condition and verified with data from hot box tests available in the literature. Thereafter, a parametric analysis is performed based on the air change rate in the cavity (0 to 1000 1/h), type of the external cladding (brick and vinyl siding), seasonal variation (summer and winter conditions), and presence of the reflective insulation. The results are compared with a closed cavity to see the efficiency of the ventilation in the air-space. The results confirm that the theoretical thermal resistance of the ventilated air-space is a function of multiple factors, and its magnitude varies under different conditions.
Thermal performance of roofs suitable for developing countries in tropical climate
Authors: Čanda P , Kopecký P
Published: December 2021

Roof structures have been traditionally built from reed or straw in tropical climate locations. Now, traditional materials are often replaced by pure metal sheets. The roof construction is improved in terms of durability and cost effectiveness, but he roof built from pure metal sheets can cause excessive overheating of interior spaces. The aim of this paper is to compare dynamic thermal performance of different roof assemblies under real boundary conditions. For this purpose, a thermally insulated test box was built on the roof of the university. Six roof samples (0,9 m × 1,1 m) can be mounted on the roof. The roof covering made of pure steel sheet with Zn coating was the reference case. This assembly was then modified step-by-step either by change of colour, or by additional material layers of reed and earth boards, or by 2cm thick ventilated air cavity on the rear side of the sheet. In total, 18 different roof assemblies were tested in three consecutive test runs (approximately three-week periods between 07 – 09-2020). Ventilated air gap and white paint are the best adjustments to reduce heat flux. Dark colours of the metal sheet have the opposite effect. Influence of reed and earth boards was in many cases similar. One roof assembly was selected for use in real project.
An impact of moisture content on the air permeability of the fibrous insulation materials
Authors: Kosiński Piotr , Wójcik Robert , Skoratko Dariusz , Attia Shady
Published: December 2021

Fibrous materials are characterized by good thermal properties, but are susceptible to air filtration. Effective air and wind protection of the building envelope eliminate the problem of air penetration of fibrous materials, but there are still many buildings where this protection has not been applied. Authors investigated the effect of moisture content on the air permeability of chosen loose fibrous materials: mineral wool, wood wool and cellulose fibers. The presented results may be used to simulate and calculate heat loses in existing buildings.
Heat and moisture transfer in wall-to-floor thermal bridges and its influences on the insulation performance
Authors: Xue Yucong , Ge Jian , Fan Yifan
Published: December 2021

The moisture modifies the characteristics of heat transfer in building envelopes. Multiple factors, including the distinct hygric properties of various material, gravity, etc., affect the moisture content, resulting in a non-uniform distribution of water vapour in different parts of the envelope (e.g. column, beam, the main part of exterior walls). Usually, the more water vapour in a material, the higher the thermal conductivity, resulting in more heat transfers here. Moreover, condensation easily occurs where there is wet, marking such parts have risks both on structural safety and mould growth. The wall-to-floor thermal bridge (WFTB) occupies the largest area among all kinds of thermal bridges that formed by frame structures. In this study, we aimed to quantify the influence on heat loss through WFTB when the moisture transfer in envelopes is considered. The average apparent thermal resistance of WFTB (R
TB, ave) was defined to access the insulation performance of WFTB in practical application. The results of transient numerical simulation indicated that when the moisture transfer is considered, the insulation performance of building envelopes decreases significantly, while the adverse effect of WFTB on heat insulation becomes less pronounced. The results indicated that the measures of insulation for WFTB should be reconsidered when the moisture transfer is considered.
Energy use of buildings in relation to occupancy rates
Authors: Davidsson H , Chowdary S K , Gentile N , Berggren B , Kanters J
Published: December 2021

This paper presents basic data of the energy demand for district heating and plug loads logged by a building management system of an energy-efficient academic building located in Lund, Sweden. The data refers to the years 2019 and 2020 when occupancy varied significantly due to the Corona pandemic. The data shows that the building energy demand adapts poorly to fluctuating occupancy rates. With a possible increase of smart working in the future, building codes should account for more fluctuating occupancy rates in the modelling of the energy demand of buildings.
Curing building related illnesses by using an emissions barrier
Authors: Larsson L , Mattsson J , Lehtimaa T
Published: December 2021

A new type of emissions barrier was used in premises with indoor air complaints due to emissions from the buildings in question. The emissions comprised chlorophenols/chloroanisoles and polycyclic aromatic hydrocarbons (PAH) from treated wood, and volatile organic compounds (VOC), mainly 2-ethylhexanol, from PVC flooring and the glue used to paste the flooring onto a concrete slab. Attaching the barrier at the surfaces from where the emissions were spread (floor, walls, ceiling) resulted in a fresh and odour-free indoor air. We conclude that using an emissions barrier in buildings made unhealthy by moisture is an efficient way of restoring a pleasant and healthy indoor air.
Preliminary experimental research of metal-organic frameworks (MOFs) for formaldehyde dynamic adsorption
Authors: Chen Shan , Zu Kan , Fang Lei , Qin Menghao
Published: December 2021

Formaldehyde is a common emission from furniture and indoor decorations. Although the concentration of formaldehyde gas is not too high in the indoor environment, it is highly toxic and carcinogenic. The formaldehyde removal potential of a novel type of green and safe nano-porous materials, Metal-Organic Frameworks (MOFs), with a high surface-to-volume ratio, strong adsorption capacity, and low regeneration temperature was investigated. To date, researchers are mainly focusing on formaldehyde selectivity and detection using MOFs in low moisture circumstances. This study carried out a series of experiments to compare breakthrough curves of formaldehyde dynamic adsorption on MIL-100(Fe), MIL-160(Al), and aluminum fumarate with activated carbon. In experiments, the formaldehyde was evaporated from diluted formalin solution, dried to 30±5 % RH, and driven through different adsorbents by nitrogen. The results indicated that MOFs showed great potential for indoor air formaldehyde removal.
A large field study of relationship between indoor and outdoor climate in residential buildings
Authors: Rupp Ricardo F , Trotta Gianluca , Toftum Jørn , Andersen Rune K
Published: December 2021

High-quality data on indoor climate and energy collected in buildings is required to deepen our understanding of building performance. The aim of this work was to investigate the relationship between the indoor and outdoor climate in Danish residential buildings. Field data was collected in 45 apartments from April 2019 to November 2020. Internet of things (IoT) devices were installed to record the temperature, relative humidity and CO2concentration in the central corridor of each apartment. High CO2concentration (above 1,000ppm) and overheating were observed in the apartments. The changeover between the heating mode and the free running mode occurred between 11.1 to 13.6°C of outdoor air temperature. The temperature setpoints of the heating systems were around 20.6-22.3°C, which could be useful values to feed building simulations in order to achieve more realistic predictions of indoor climate and energy. The results of this study improve our understanding of indoor environmental quality in residential buildings at a national level.
Research on Large Space Fire Monitoring Based on Image Processing
Authors: Zhang Guanghua , Cui Rongsheng , Qi Kai , Wang Bingqi
Published: December 2021

Fire in large space buildings has the characteristics of rapid spread and easy to ignite, which makes it difficult to extinguish fire. Therefore, the research on fire safety prevention technology of large space buildings has strong practical significance and practical value. Fire image automatic monitoring technology is based on the advantages of image processing and the high-speed operation of computer language. This paper proposes a fire monitoring technology which uses the information of flame image to analyze and judge fire. It combines computer graphics, digital image processing and computer vision technology, and one new image-based fire detection and processing technology is studied from the aspects of flame morphology and flame color.
Application Research of Mechanical Mold Design Based on Computer Aided Technology
Authors: Gu Jiren , Chen Longbo
Published: December 2021

There are many kinds of industrial products. Different industrial products play different roles in life. There is no doubt that they are indispensable in our life. We found that most of the production of industrial products rely on the mold industry[1]. Mold industry is also the foundation of mechanical design industry. However, the traditional mold design concept is very old. Moreover, the disadvantages of traditional mold design are also many. Based on this, the experts put forward the mechanical mold design supported by computer-aided technology. This paper presents the main application of computer aided technology in die design.
Design and Research of New Energy Technology in Electric Power Information Intelligent System
Authors: Huang Chongqian
Published: December 2021

After the Industrial Revolution, with the continuous improvement of people’s living standards and the great changes in science and technology, the traditional energy has been unable to meet people’s new needs of production and life and the concept of sustainable development. As a hot topic in recent years, new energy can become one of the new ways to promote the continuation of resources. The traces of the rapid development of new energy can be found in various fields related to people’s lives. Electric power information system is one of the aspects. It is well known that human beings can not live or work without electricity. Therefore, it is very important to apply new energy technology in electric power information system. This study studies from the overview of new energy technology, the overview of power information intelligent system and the application of new energy technology in power information intelligent system.
Optimal Design and Analysis of Intelligent Vehicle Suspension System Based on ADAMS and Artificial Intelligence Algorithms
Authors: Liu Jianjun
Published: December 2021

A complete suspension model is established, and the suspension system is simulated and optimized. The method of suspension system establishment and simulation is explained in detail, and the influence of suspension parameter changes on vehicle handling and stability is analyzed in detail. The dynamic simulation analysis of wheel parallel runout test was carried out on the system, and the suspension system was optimized by artificial intelligence algorithm. The research results provide a technical basis for the design of automobile suspension.
The UI Design of the Picture Logo of the Terminal Human-Computer Interaction Interface
Authors: Liu Ming
Published: December 2021

With the advancement of the information society and the development of China’s economy, enterprises to digital, information, intelligent production requirements continue to improve, the application of industrial software gradually popularized in the production of enterprises. However, in the Internet era, the research on man-machine interface design is in full rage, but the man-machine interface design of domestic industrial software has not been paid attention to. The level of industrial software interface is seriously backward, disjointed with The Times, and completely contrary to, high technology, high efficiency and other industrial execution concepts. On the one hand, this phenomenon will affect the working efficiency of the staff in the operation of the software and the user experience, reduce manufacturing enterprises related to attract talent, on the other hand can also lead to the software under the same technical level, domestic industry software products to attract customers’ ability is insufficient, in the competition with foreign brand products in bad situation.
Application of Computer Network Data Communication Technology in Production and Life
Authors: Lu Jun
Published: December 2021

With the rapid development of modern economy and science and technology, my country’s computer technology has also been rapidly developed. In daily life, information technology has a great impact on people’s lives, such as the large-scale use of mobile media. Essentially, mobile media is a kind of remote network communication technology. With this technology, real-time sharing of information in society can be realized. This article mainly analyzes the application of computer remote network communication technology from the current situation.
Artificial Intelligence Based Sensor Network Congestion Fuzzy Control Algorithm
Authors: Luo Jing , Xiao Xiaoxu , Wang Rongxia
Published: December 2021

The topology control of sensor sensor network was studied based on fuzzy control algorithm. Aiming at the dynamic changes of the topology of large-scale and heterogeneous artificial intelligence sensor networks and the incomplete information between nodes, a smart network-based congestion control algorithm for sensor networks was proposed and the performance of fuzzy control algorithms was analyzed. Based on this, a fuzzy control algorithm was designed. The algorithm fully considered the residual energy of nodes and the distribution of nodes in the network. Therefore, the reasonable election of the cluster head can be realized through the game between nodes, which effectively avoided energy holes, made the network energy consumption more uniform, prolonged the network life cycle, and optimized the network topology.
The Border Attack Defense System is Software-Based
Authors: Wang Rui , Chang Yingxian , Ma Lei , Zhang Hao , Liu Xin , Chen Jianfei , Liu Donglan , Zhang Yong , Su Bing
Published: December 2021

Now the computer has been completely towards the public, the network in daily life is more and more widely used, but at the same time, the potential network security problems are also more and more serious. Some sophisticated computer people in order to make money, crack other personal users or company information, a variety of network attacks one after another. Cyber attack has become an extremely feared existence for ordinary people because of its wide range of attacks, strong attack force and obvious hiding effect, which seriously threatens the security of personal information network. If attacked by this kind of attack, the loss borne by each person or company is immeasurable. In order to maintain network security, the defense system is also improving day by day, and finally presents software. This paper mainly makes a detailed understanding of the border attack and defense system, and analyzes the main reasons and inevitability of the software of the border attack and defense system.
Design and Research of Firewall System of Communication Department Based on Network Information Technology
Authors: Wang Xing , Zhao Tao
Published: December 2021

In the past, the structure of traditional firewalls was similar to that of checkpoints, and the design structure was relatively simple. At the same time, it is also convenient for subsequent maintenance. As an isolation technology, it can be accessed by people with consistent identity information. But for some relatively high-level data information, using traditional firewalls, foreign intruders can easily obtain relevant information. This article chooses to use the working mechanism of network information technology, and then analyzes the hardware structure of the firewall based on the IPX2400 processor. Finally, a preliminary design of a firewall system for the communications department based on the IPX2400 processor is implemented, and its packet filtering function is realized.
Research on Environmental Art Design Based on Computer 3D Animation Technology
Authors: Yin Ni
Published: December 2021

In order to improve the ability of environmental art design, a method of environmental art design based on computer three-dimensional animation technology is proposed, and a three-dimensional animation imaging model of environmental art design is constructed. Combining the RGB decomposition technology to extract the color components of the environmental art design three-dimensional animation image, use the color template space projection algorithm to perform the block fusion processing of the environmental art design three-dimensional animation image. The simulation results show that the three-dimensional recognition ability of environmental art design using this method is better, and the performance of feature reconstruction is better, which improves the three-dimensional visual presentation ability of environmental art design.
Research on the Application of Interaction Design in the Functional Design of Intelligent-home Products
Authors: Zhang Linjing
Published: December 2021

The networking operation of intelligent-home products can expand more functions and bring consumers more in-depth interactive experience. The effective integration of interaction design, intelligence and info tech in intelligent-home products can effectively solve the shortcomings and problems of home market products. Based on this, this paper first analyses the concept and value of product functional interaction design, then studies the functional design of intelligent-home products based on interaction design, and finally gives the utilization strategy of interactive design in the functional design of intelligent-home products.
Research on the Application of Computer BIM Technology in Geotechnical Engineering
Authors: Shang Haijing , Yang Mingling
Published: December 2021

BIM Tech on account of its three-dimensional, intuitive, visual, reconfigurable and other aspects of the typical characteristics, has gained more and more attention in the field of architecture and civil engineering, and obtained more in-depth research and application. On account of this, this paper first analyses the concept of IM tech and its utilization value, then studies the specific utilization of computer BIM Tech in geotechnical engineering, and finally gives the utilization strategy of computer BIM Tech in geotechnical engineering.
Application of Intelligent Manufacturing Technology in the Field of Ship Design and Manufacturing
Authors: Wang Peiyu
Published: December 2021

With the rapid development of information technology and its gradual penetration into the traditional manufacturing industry, modern industry has entered a period of intelligent manufacturing. In order to firmly grasp this brand-new development opportunity, various industries in our country are accelerating innovation and development, forming a number of brand-new industries and models. At this stage, the global shipping volume is increasing slowly and the endogenous power is lacking. The shipbuilding industry occupies a large proportion of my country’s traditional industries. It not only provides technical equipment for the development of marine resources and national defense construction, but is also an important channel for world trade, driving the development of many key industries, and it is a modern comprehensive industry with a huge industrial chain. Sex industry. The shipbuilding industry can drive the rapid development of the local economy and play an important role in promoting labor employment and ensuring the safety of coastal defense. In recent years, my country’s foreign trade has been growing at an alarming rate, which has provided better development opportunities to a certain extent. The industry has high international competitiveness.
Research on Durability Design of Concrete Structure in Building Engineering Based on Computer Technology
Authors: Yang Guang , Guan Hongjie , Ma Wenna
Published: December 2021

With the continuous progress of The Times and the rapid development of society, great changes have taken place in the way people live, study and work at present. Due to the continuous improvement of people’s living standards, people now have higher and higher requirements for their living environment. People are not only satisfied with the food and clothing they used to have, but also pay more attention to the pursuit of spiritual homes. In our country, the computer technology and the construction industry have always been the focus of our national attention, because they are closely related to the lives of ordinary people. In the construction of the concrete structure is an indispensable building material in the construction process, based on the status of the concrete structure in the construction process, the relevant work technology researchers on the concrete structure of a series of characteristics have been related to the development of the function of the continuous exploration and analysis.
Optimization and Upgrade of Special Database Management System for University Archives Based on Cloud Computing
Authors: Wang Jianjun
Published: December 2021

With the progress of society and the development of science and technology, the data management of archives in colleges and universities has also changed from traditional manual operation to information technology system operation, which has taken a big step forward in the speed of data archive management. At the same time, following in the footsteps of the party and the state, according to the education reform measures issued by them, further implementation and implementation. With the innovation of education model, the reform of management method, and the expansion of teaching scale, the types and quantity of files are also increasing, and the scope is also expanding, which leads to the continuous increase of management difficulty. This requires data management to achieve informatization to meet the needs of society. The purpose of this paper is to study the optimization and upgrading of the special database management system of the archives of colleges and universities based on cloud computing. Based on cloud computing, this paper proposes the establishment of a special database management system for college archives and the methods and key technologies used in the process of optimization and upgrading. First, analyze the characteristics of the database management system, and then conduct demand analysis and functional analysis of the system. Secondly, research the advantages and disadvantages between the traditional data management of colleges and universities and the current latest database management system. Finally, according to the needs of the special database and system function requirements, the overall design of the archives management system is carried out, database modeling tools are used to optimize the database, and then its operation is studied, and system testing is carried out to enable it to meet the needs of university archives management. The experimental results show that the focus of database function optimization in different universities is different. University A prefers timeliness, accounting for 46%. University B thinks security is the most important, accounting for as high as 51%. University C is relatively even, both at 30%. The conclusion is to select the most practical and demanding functions for further optimization, and choose an overall design suitable for the special data of colleges and universities.
Research on Aging Dielectric Properties and Physical Testing of Electric Vehicle Insulating Silicone Rubber under First Principles
Authors: Zhang Zhiqiang , Wang Wenlin , Feng Cheng , He Peng , Yang Jingcheng , Wu Zhensheng , Yang Haitao
Published: December 2021

Aiming at the aging problem of insulating silicone rubber for new energy vehicles, this paper studies the equations of the aging of silicone rubber and its dielectric properties based on first-principles calculations. First, through the analysis of the microscopic mechanism of silicone rubber aging, the equations of the aging of silicone rubber and the rupture of the molecular main chain is obtained. Then the equations of silicone rubber molecular length and dielectric constant are solved by density functional theory. Ultimate, a molecular chain scission model of silicone rubber was built, and the micro-dielectric relationship was extended to the macroscopic level. The equation of the norm molecular length of silicone rubber and the dielectric constant is obtained. It provides an important theoretical basis for the aging detection of insulating silicone rubber for new energy vehicles based on electromagnetic waves.
Analysis of Pressurized Pyrolysis Behavior of Yichun Coal at Different Temperature with Gas Chromatography and Mass Spectrometer
Authors: Jiang Yuan , Tian Yuanyu , Qiao Yingyun
Published: December 2021

The fast pyrolysis connected with gas chromatography/mass spectrometer is used to explore the pyrolysis process of Yichun raw coal, and the influence of different pyrolysis temperatures on the composition and distribution of pyrolysis products under high pressure is investigated. Studies have shown that as the temperature increases, the number of volatile substances gradually decreases, which indicates that high pressure inhibits the production of volatiles. In addition, aromatic hydrocarbons in pyrolysis volatile substances dominate, and as the pyrolysis temperature increases, their content gradually increases. The volatile substances transform towards low carbon number compounds with the increment of temperature.
The study of the physical characteristics and cooling plate thermal control below the lithium battery based on FEA
Authors: Yang Dazhou , Jiang Mengjun
Published: December 2021

Four types of cooling plates with serpent channel structures are established to study the cooling effect of rectangular lithium-ion power battery under different cooling plates. Then, the number of serpent bends is analyzed, whether the fillet and pipe wall thickness is set on the cooling performance of the liquid cooling plate. According to the analysis results, a new liquid flow structure form of liquid cooling plate is designed. Numerical simulation results show that the newly designed cooling plate is integrated with the front flow of water and the internal liquid side flow, achieving a cooling effect with the maximum temperature is 309.55K and a pressure drop of 6032.1pa, which has the most effective cooling performance. Under the requirement of controlling reasonable temperature and low-pressure drop, a liquid cooling plate with better performance can be designed by innovatively setting the direction of the water inlet and outlet and the water channel’s internal flow. The above results will provide some ideas for the design of a lithium-ion battery liquid cooling plate.
Research On the Effect of Reinforcing Filler on The Mechanical and Electrical Properties of Insulating Coated Silicone Rubber
Authors: Yang Junting , Huang Zhijuan , Ma Zhenqi , Zheng Mingguo , Su Juan
Published: December 2021

This paper studies the silicone rubber insulation coating material used for the modification of overhead bare wires. The influence of two reinforcing fillers of silicone rubber on the density, mechanical properties and electrical properties of insulating coating materials was explored. Finally,25 copies of white carbon black were selected as a reinforcing filler to prepare a low-density, high-strength, and good insulating silicone insulating coating material.
Realization of GPS Dynamic Hijacking Based on Software Radio
Authors: Wang Zhihui , Yang Fan
Published: December 2021

GPS positioning technology has a wide range of use scenarios, but due to the known characteristics of GPS signal open reception and modulation methods, many solutions can easily deceive GPS signals. Once this technology is abused in violation of regulations, it may cause major safety and property losses. In order to better study the anti-hijacking technology of PGS signals, this article starts with the generative dynamic hijacking of PGS, gives the implementation method based on software radio, and further learns the code phase and dopper between asynchronous hijacking and synchronous hijacking through software radio. The compensation calculation method of Leer frequency shift parameters, and verified the effect of the software radio’s GPS dynamic hijacking implementation method through examples, and provide theoretical support for the design and improvement of future anti-hijacking systems.
High power density thermal control design of onboard phased array antenna
Authors: Su Quanyong , Liu Juan , Xue Xianmou , Shi Zheng
Published: December 2021

Thermal control of high power density phased array antenna [1] has become a critical problem for onboard seeker which is confined by compact structure and harsh flight condition [2-4], different from land-based or airborne seekers. As a key technology, thermal control of onboard phased array antenna faces the challenge of high density power element as well as worse operating temperature. Using finite volume method as theoretic foundation of numerical simulation, this paper firstly calculates temperature field and fluid field via discrete control equation group, which is transformed from continuous integration equation group according to energy reservation equation. Next,2 kinds of phased array antenna with phase change energy storage and water cooling are designed and evaluated by thermal control performance simulation. Then advice is given for reasonable assembly after temperature distribution of phased array antenna is quantified under different assembly state with the influence of contact thermal resistance. At the end, precision of temperature simulation is verified with temperature test result of phased array antenna.
A Study on the Detection Method of Dark Matter using Gravitational Waves
Authors: Li Zheng , Yang Chenyu , Zhou Xinen
Published: December 2021

Dark matter is a type of invisible matter that analytically exists in the universe. Nowadays, scholars have yet detected it and confirmed its presence experimentally. Einstein predicted gravitational waves based on his general theory of relativity. In 2015, the Laser Interferometer Gravitational-Wave Observatory (LIGO) first detected the gravitational wave. This paper reviews the background of dark matter and gravitational waves and introduces the method of detecting dark matter with gravitational waves. Moreover, the feasibility of the scenario has been verified based on information retrieval and theoretical analysis. These results shed light on the future detection schemes of dark matter detection.
Design and Thermal Analysis of Temperature Control Experiment Box for Final Optic Assembly
Authors: Chen Changqi , Xi Tianshu , Zhang Yanan
Published: December 2021

The Final Optic Assembly (FOA) is one of the key components of the inertial confinement nuclear fusion device. The temperature change in the FOA is related to the laser frequency conversion efficiency of the frequency doubling crystal. In order to research the temperature control of FOA, this paper considers the internal atmosphere and internal structure of FOA, designed and fabricated a vacuum temperature control experiment box, and set up heat sources inside the box to simulate the internal heating of the FOA. This article uses different radiation heat transfer models to analysis the temperature field of the vacuum experiment box. Compare the thermal simulation results of the S2S model and the DO model, and compare them with the actual temperature of the vacuum experiment box under the same boundary conditions. The results show that the S2S model fits well with the experimental results and is more suitable for thermal analysis of FOA, which is of great significance to the follow-up FOA temperature control research.
Mechanical Properties and Fracture Analysis of High Strength Bolts in Nuclear Power Plant
Authors: Lai Yunting , Ma Qinzheng , Zuo Dungui , Zhang Guodong , Liao Kaixing , Zhang Zhongwei
Published: December 2021

A high-strength bolt of a steel structure of a nuclear power plant failed and fell off. In order to determine the cause of the bolt’s fracture, a series of tests such as macro inspection, physical and chemical performance test, and microscopic analysis of the fracture were carried out on the failed bolt. The results show that the cause of bolt fracture is hydrogen embrittlement. Hydrogen infiltrated into the bolt during the phosphating process and the corrosion process during use, and then hydrogen continued to accumulate eventually causing hydrogen embrittlement fracture. Dehydrogenation treatment should be performed immediately after the phosphorylation treatment, and the anti-corrosion method of the bolt should be optimized, which is an effective measure to prevent the hydrogen embrittlement of high strength bolts.
A thermoplastic resin matrix and its physical properties suitable for deformable mandrel
Authors: Lu Xin , Jing XiShuang , Zou JiaRong , Zhang ChengYang , Wu ChenJun , Chen SiYu
Published: December 2021

The mandrel is able to shape the part cavity, therefore is of great significance for composite parts in the manufacturing of carbon fiber reinforced polymer(CFRP) composite part. However, in the manufacturing of composite parts with complex cavities, traditional rigid mandrel cannot be removed out of the cavity in any direction after the outer prepreg is cured. To solve the problem of difficult demolding, a kind of deformable mandrel emerged. The deformable mandrel is rigid at room temperature to support composite part curing. While at relatively high temperatures, the mandrel is softened so that the mandrel can be easily removed from the composite part despite the complex part cavity shape, therefore resolving complications regarding the demolding process. In this paper, a thermoplastic resin material matrix suitable for the preparation of deformable mandrel is proposed. Ingredient and manufacturing flow of the thermoplastic resin matrix are introduced, and the applicability of the proposed matrix with regard to the deformable mandrel is validated through dynamic mechanical analysis.
Research on Early Warning Technology of Lightning Arrester Defects Based on Multi-stage Information and Bayesian Inference
Authors: Pei Ying , Niu Lin , Li Haifeng , Li Yajin , Yu Dayang
Published: December 2021

The differences in the probability of occurrence of different equipment and defects lead to the small sample characteristics of the defect of the arrester, which makes it difficult to train an accurate prediction model. It is difficult to identify the abnormal state when the arrester monitoring data does not exceed the limit and increase steadily relying on the arrester monitoring index and threshold to judge the defect. Therefore, a lightning arrester defect early warning method based on multi-stage information and Bayesian inference is proposed. The Bayesian inference algorithm is used to calculate the probability of defect cause categories under different feature quantities. According to the new test evidence, the probability of the defect cause category under different feature quantities is updated to identify the defect cause. The algorithm automatically adjusts the prior probability indicators of equipment defects and causes in the model based on the new detection data and annotation conclusions to ensure the accuracy of defect cause classification. The lightning arrester operation and maintenance data and online monitoring system of a power company is used to analyze and verify the effectiveness and correctness of the method proposed in this paper, which provides effective supportfor the lightning arrester operation and maintenance.
Study on Response Spectrum of Seismic Design of Ultra High Voltage Converter Valves in Bedrock Site
Authors: Cheng Yongfeng , Lin Sen , You Hongbing , Lu Zhicheng , Chen Ersong
Published: December 2021

It is difficult to evaluate seismic performance of ultra-high voltage (UHV) converter valves reasonably because the response spectrum period used in seismic design of electrical equipment fails to cover the structural period of UHV converter valves at present. Bedrock response spectrum is the basis of seismic design response spectrum. 471 records of long period strong earthquakes in bedrock were analysed. The amplification power spectra and average spectra of all records were calculated. The seismic hazard analysis of 17 typical UHV converter stations was carried out, and the bedrock response spectra with exceedance probability of 10% and 2% in 50 years were proposed. The structural forms of the existing main response spectrum descending segments were compared and analysed. The corresponding response spectra of the long period strong earthquake records and the bedrock response spectra of the UHV converter station were fitted. The bedrock response spectrum of the UHV converter valves with the period range of 0-10s was determined, which lays a foundation for the seismic performance evaluation of the UHV converter valves.
Physical Properties and Failure Analysis for Bolts in the Diaphragm Valve by Micro Morphology and Metallographic Test
Authors: Zuo Dungui , Zhang Zhongwei , Lai Yunting , Zhang Guodong
Published: December 2021

The reasons leading to the fracture of 17-4PH stainless steel bolts in the isolation valve of a power plant was analysed by means of morphology analysis, chemical analysis, hardness test, metallographic test, pitting corrosion test and intergranular corrosion test, SEM and other detection means. The results show that there are many corrosion pits on the surface of the valve stem in the seawater system, the corrosion pits is extend and propagation in intergranular cracking. The main reasons to valve stem fracture are the low corrosion resistance of the material and the improper aging process of heat treatment.
Application of Electric Energy Saving Light Source and Light Emitting Diode in the Landscape of Buildings under Optical Spectroscopy Theory
Authors: Shi Xiaojing
Published: December 2021

How to reflect energy conservation and environmental protection in the landscape of high-rise buildings is a hot topic of current research. How to use environmentally friendly materials to show the charm of high-rise building landscape is the main content of this article. Based on the colour samples of the high-rise building landscape, the thesis uses environmental protection and energy-saving light sources to simulate the lighting of the building colour samples in the laboratory. This article realizes the quantitative research on the colour authenticity performance of colour paintings under commonly used LEDs in high-rise building landscapes, and provides a reliable basis for the selection of LEDs in colour painting lighting design.
Variation Characteristics Mathematical Calculation of O3 and Its Relationship with Meteorological Factors by Big Data Technology
Authors: Jin Tiantian , Wang Lei , Zhao Yuguang , Shen Luming
Published: December 2021

Based on the data of environmental monitoring stations and meteorological stations in Qinhuangdao from May 2017 to May 2020, the variation characteristics of O3 and precursors (NO2 and CO) as well as their relationship with meteorological elements were analyzed. The results showed that the daily average concentration of O3-8 h in Qinhuangdao increased year by year. The monthly average concentration of O3-8 h was high in summer and low in winter, and the peak appeared in June. The diurnal variation of O3 concentration was unimodal structure, and the concentration increased in the afternoon, but it decreased at night. The concentration of NO2 and CO was inversely correlated with O3, and the peak value of NO2 in March could be related to frequent cold air activity and increased burning of loose coal. The meteorological elements favorable for the occurrence of ozone pollution weather in Chengde were total solar radiation irradiance greater than 1000W/m2, the daily maximum temperature greater than 33 °C, and the daily minimum relative humidity less than 40% and 65%∽80%, southerly wind or southwest wind.