bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Forming Process of Aviation Composite Material Based on Finite Element Simulation
Authors: He Jun , Cao Meng , Cong Fanglin , Wang Shuo 
Published: March 2021

Abstract
The temperature field by influenced during the curing process of the autoclave, the composite material laminate produces thermal stress and curing residual stress resulting in deformation. Hence, the product is difficult to achieve the expected goal. In this paper, finite element analysis of composite laminates is carried out by using ABAQUS software. For the composite prepreg unidirectional zone, the finite element simulation of the temperature distribution, stress distribution and deformation of composite laminates is carried out during the curing process. The mathematical model of composite curing is established, and the curves of stress and temperature with time are obtained. The influence of various factors on the curing effect is obtained. The influence of factors such as autoclave holding temperature, heating rate, gas pressure in the tank and layup angle on the temperature field and stress field of composite laminates are discussed by finite element method. Through the method of finite element model, time and experiment cost can be saved effectively, which provides a powerful theoretical basis for actual production.
A LCA-based Optimization Method of Green Ecological Building Envelopes: A Case Study in China
Authors: Song Yiming , Zhang Hong , Mo Hongzhi 
Published: March 2021

Abstract
Climate change and resource depletion have led to the destruction of the environment, making it more urgent to address the irreversible environmental effects caused by construction industry. Life Cycle Assessment (LCA) is a systematic analytical method applied to evaluate buildings since 1990, covering every phase of buildings’ whole life cycle. However, the application and influence of LCA has been restricted due to the time-consuming procedures, the high cost of software, the hysteresis and limited samples in academic studies. This research takes a light-frame industrialized housing product as a prototype, collects a variety of common building envelope materials, evaluates the life cycle energy of 1344 possible wall assemblies by using C# language, and investigates the influences of different materials. The results show that construction energy accounts for 65.97% to 68.41% of life cycle energy, which is the largest part in the whole life span, much higher than the proportion of operation energy. Meanwhile, both life cycle energy and construction energy are strongly influenced by the outer layer materials of the building’s envelope, and the operation energy is closely related to the thermal insulation materials. In addition, this paper also shows a feasible methodology that could be adjusted to estimate various life cycle performance (including life cycle energy, life cycle carbon emissions, life cycle cost assessment, etc.) automatically in the architectural design stage and guide the buildings’ design more effectively.
Study on the Preparation Method and Combustion Characteristics of Biomass Char Fuel Made from Chicken Manure Synergistic Plastic Waste
Authors: Wang Jingfu , Matsushita Takamichi , Yuminaga Jikyou , Jia Hongxin 
Published: March 2021

Abstract
In order to solve the problem of energy utilization of urban plastic garbage and livestock manure, this paper developed a method and technology to produce high-calorific value biomass char fuel through low-temperature pyrolysis in drying, thermal decomposition, extrusion and other processes, using urban plastic garbage and chicken manure as raw materials which are difficult to recycle. Established the verification experiment device in Chiba prefecture, with a 15% plastic + 85% chicken manure as raw material, the preparation of the calorific value of 5500-6000 kcal/kg of high calorific value of biomass char fuel. The ignition temperature, burning-out temperature, comprehensive combustion characteristic index S and other combustion characteristics of fuel were analysed by thermogravimetric experiments. The kinetic analysis of fuel was carried out by means of Coats-Redfern method. The pre-exponential factor and activation energy of combustion temperature range were obtained. The results show that the volatilization of biomass char fuel exceeds 60%, the ignition temperature and burnout temperature are low, and the ignition performance is good and the combustion speed is fast. The fuel calorific value is 24985kJ/kg (5976kcal/kg), the activation energy is 55.11kJ/mol, and the comprehensive combustion characteristic index S is 4.57×10−8 min−2K−3, which is similar to bituminous coal. In addition, biomass char fuel contains almost no sulphur and does not require desulfurization equipment. It is a kind of biomass fuel that can achieve clean and efficient combustion and replace coal.
Insights into Variable Effects of As (III) on the Fate of Antibiotics Resistance Genes and Microbial Community during Antibiotic Fermentation Dregs Co-composted with Swine Manure
Authors: Zhang Bo , Wang Peng 
Published: March 2021

Abstract
Composting is used commonly for the treatment and cycle utilization of solid organic wastes like antibiotics fermentation dregs (AFDs) and swine manure. Heavy metal arsenic is prevalent in those two matters as well. While its effects on the fate of antibiotic resistance genes and succession of microbial communities are still unclearly. Therefore, the lab-scale composting experiments with two exposure levels of As were established in this study. The results showed that co-composting could reduce the biological activity and toxicity of As effectively, and the bioavailable As contents had a higher potential ecological effects on the dissemination of ARGs rather than the total amounts of As. Additionally, correlations analysis indicated that the succession of bacterial community and bioavailable heavy metals were all response for the ARGs propagation during As-amended co-composting process, indicating that the changes of ARGs were driven by the combined effects of various factors during the co-composting process.
Land Transportation Accessibility and Urbanization Spatial Pattern Based on Coupling Coordination—Taking Chengdu-Chongqing Urban Agglomeration as an Example
Authors: Wang Qi , Qian Yongsheng , Zeng Junwei , Yin Fan , Zhu Leipeng 
Published: March 2021

Abstract
Urbanization and transportation network construction influence and restrict each other. To explore the interaction between transportation development and urbanization spatial pattern, take the Chengdu-Chongqing urban agglomeration as an example to discuss the evolution relationship between land transportation accessibility and urbanization spatial pattern based on coupling coordination measurement model. The results show that the spatial distribution of urbanization level has typical characteristics of “core-periphery”. Besides, the accessibility of all kinds of land transportation presents a pattern of “central agglomeration” and “axis expansion”. The coupling coordination degree of the land transportation accessibility and urbanization is generally higher, and the western region is better than that of the eastern area. Specifically, coupling coordination degree between urbanization and high-speed railway/ordinary railway accessibility is higher in the west and lower in the east, while it opposite between urbanization and highway/land transportation accessibility, which is higher in the east and lower in the west.
A Generalized Approach to Estimating the Out-of-plane Buckling of Steel Sections with a Triangularly Corrugated Web
Authors: Kudryavtsev Sergey 
Published: March 2021

AbstractBuilding practice shows that I-sections consist of flanges and corrugated web could be quite effectively used for the construction of compressed structures. In the present work, an investigation into the behaviour and design of steel bending and compressed members with the triangularly corrugated web is carried out. Based on the result of the finite element analysis (FEA) conducted by the ABAQUS an attempt is made to generalize approaches in the evaluation of the stability of such structures. The necessity for this work is since, in the most building codes and studies, the issues of the global buckling of such structures are considered separately for beam structures and for structures at central and eccentrical compression. Most of the building codes do not provide any recommendations and requirements for the design of compression members with corrugated webs at all and only consider the case of bending. It is shown that beam and column structures with triangularly corrugated web works almost identically in case of out-of-plane buckling. Finally, is proposed an expression allow to calculate the critical force in flanges of the cross-section in case of out of plane buckling caused by transverse bending, axial of eccentrical compression uniformly, that could be useful for practical structural design.
Strength Verification of Structural Steels and Materials
Authors: Juhás Pavol 
Published: March 2021

Abstract
There is already a relatively wide range of structural steels and materials of various shapes and strengths for manufacturing of steel structures. They produce in different countries of Europe and the world. It is primarily a matter of the manufacturer, resp. the contractor of the steel structure with the vat and under what conditions he will provide the necessary construction materials. In addition to the price point of view, the quality of the considered construction materials is probably important. In particular, their geometric and strength suitability and accuracy are taken into account here. The quality of structural steels and materials is generally specified in the relevant standards and is the responsibility of the respective manufacturers. They declare it in the so-called quality certificates. At the same time, for various reasons, there may be a need to verify the declared quality, in particular the strength of specific structural steels and materials. The paper presents common probabilistic-statistical procedure and the strength procedures of structural steels and materials based on the test results, which are enabled by the current European standard EN 1990: 2002 as well as the transformed national standard CSN EN 1990: 2004, and similar other national standards. The practical application of the individual procedures and some details are illustrated by a specific example.
Construction-Technical Survey of a Historical Building in Loket
Authors: Kankovsky Ales , Dedic Martin 
Published: March 2021

Abstract
The main objective of the article is to inform about the construction-technical survey, which focuses on the existing historical building from the first half of the 19th century, in Loket city, Czech Republic. In the past, the building was hit by floods, which affected its technical condition, the deterioration of which also affected the subsequent abandonment of the building, and neglect of maintenance. The main research issues stem from the building-technical survey focused on the condition of structures, especially the load-bearing wall structures, the ceiling structures, and the roof structures. After detecting the faults and other possible damage, we look for their causes and find out which of them are fatal to the building and which can easily remove. Of the evaluated structures, we focus mainly on their damage due to moisture, excessive structures loading, and changes in foundation conditions caused by previous floods. Furthermore, we assess the impact of failures on the structure and operation of the building. In conclusion, we propose measures based on the structure’s found failures and possibilities for their repair.
Ensuring Blast Resistance of Critically Important Buildings and Constructions in Case of Air Crash
Authors: Komarov A A , Gromov N V , Korolchenko O N 
Published: March 2021

Abstract
Introduction. The paper is focused on improving blast resistance of critically important buildings and constructions exposed to a deflagration explosion due to an aircraft (A/C) crash in their vicinity, by improving methods of the explosion effects calculation. The main tasks include: 1. considering the physical processes that occur during an aircraft crash, which causes the formation of a highly explosive cloud; 2. quantifying the parameters affecting explosion loadings; 3. provide insights into modern procedures for calculating effects of a deflagration explosion caused by an A/C crash; 4. giving an example of calculating the loadings on a critically important building or construction in a crash deflagration explosion. Methodology and calculations. The article presents a methodology for calculating the maximum parameters of explosion loadings on buildings and constructions arising from aircraft crash situations. The calculations are performed with the help of author’s and generally accepted methods by the numerical method with the use of MatLab software complex. Results and discussion. As a result of calculations, the proposed methodology allows to obtain: the fuel mass values capable of forming highly explosive mixture; to choose the appropriate scenario for the development of an aircraft crash: an igneous ball or a deflagration explosion of a fuel-air mixture; to determine the time dependence of the fuel vapor concentration in the air; to evaluate the maximum apparent flame front speed; to determine the dynamic parameters of the fireball and the time dependences of the overpressure at points in the space adjacent to the explosion site; to build up a maximum pressure field created by this deflagration explosion; to obtain the explosion loading integral parameters: the maximum and minimum explosion overpressure, the compression phase pulse, the probability of destruction of buildings; to evaluate vibration loading on the building from a deflagration explosion. Conclusion. The methodology presented in the article can be used to calculate the loadings on buildings and structures during a deflagration explosion that occurs when an aircraft crash.
Properties of Selected Polyurethane Sealants in the Sealing of Cement-based Materials
Authors: Boháček Adam 
Published: March 2021

Abstract
Since the rise of cement-based building elements, there has been a need to seal these materials. Therefore, this article deals with the sealing of cement-based materials, specifically glass cement. The aim of this work is to find a sealant for sealing this problematic substrate, to verify its suitability and to show that polyurethane sealants are also important in the construction market. The problem of a cement-based substrate lies mainly in the dustiness of its surface, where there are always small dust particles on its surface. The main method for testing these sealants is the tensile test, which checks both the properties of the sealant itself and the contact joint between the sealant and the base material. Tensile test specimens are made of glass-cement plates and three representatives of one-component flexible polyurethane sealants are selected as the sealing material. From the results of the tensile test, it can be concluded that, with the appropriate choice of sealant and primer, problematic cement-based materials with good results can be sealed, provided that the grinding is carried out correctly.
Problems of Regulating the Safe Evacuation of People at the Subway Stations
Authors: Parfyonenko A , Kostyuchenko E 
Published: March 2021

Abstract
This article describes the main provisions for assessing the safety of people during the evacuation from the subway stations. A huge number of passengers waiting for the train, leads to a seal flow. The high-density value reduces the width of the doorway in the light. People tend to enter the car without waiting for the passengers to leave it, being afraid not to have time to land in the allotted time for this or not to get into the car as a result of its overfilling. Higher intensity values can be observed in the case of a small number of waiting passengers. The density of people on the platform when waiting for the train determines, in addition, the comfort of the waiting conditions of passengers and their safety. The presented results of the study on the safety of subways will allow more accurately and differentially determine the movement of human flows in the different sections of the track at the metro stations.
Problems and Solutions for Green Roofs
Authors: Maltseva I N , Shvalev D M , Tkachuk K A 
Published: March 2021

Abstract
Green roofs have been the standard design in many countries for hundreds of years due to the excellent thermal insulation properties of the fertile layer. A green roof is a space created by adding additional layers of fertile soil and plants over a traditional roofing system. Green roofing should not be confused with a traditional roof garden where plants are placed in free-standing containers on an exploited roof terrace. This article discusses the main advantages of roofing landscaping, the factors that influence the choice of type of roofing depending on climatic conditions and the main types of design solutions in megacities. The authors analyse the influence of the green roof on the energy efficiency of the building in the climatic conditions of Yekaterinburg. The main disadvantages of landscaped exploited coatings are considered. Also proposed is a new technology for the construction of an operated roof without a roll coating, but using penetrating waterproofing of reinforced concrete structures. It has now been proven that a properly designed and installed green roof can replace or compensate for the green environment at ground level that a large city is deprived of as a result of urbanization. The use of green roofs gives the metropolis ecological, social, economic and aesthetic benefits.
Measurement of Information Security Awareness Level: A Case Study of Digital Wallet Users
Authors: Fadhilah A L , Ruldeviyani Y , Prakoso R , Arisya K F 
Published: March 2021

Abstract
Awareness of a person is an important factor in maintaining information security and reducing the fraud gap. The existence of various types of digital wallet application fraud requires someone to have an awareness of information security. This study was conducted to measure the information security awareness of digital wallet users. The research was conducted by distributing questionnaires to 156 respondents of digital wallet users. These respondents represented users of digital wallet applications in Indonesia. Information security was measured based on the user’s knowledge-attitude-behavior. The assessment of information security awareness level was calculated using the Analytic Hierarchy Process (AHP) method. The results showed that the score was at the awareness level of good (80.78%). However, several focus areas still showed score at the average level which was one of the reasons why there are still many information security breaches against users of the digital wallet.
The Performance of Indonesia’s President: A Sentiment Analysis in Social Media
Authors: Mansur Agus , Allamsyah Zuhdi , Amalia Putri 
Published: March 2021

Abstract
The role of a leader is critical, especially when a person leads a country. Indonesia, as the biggest archipelago country, led by Jokowi since 2014. From his first period in 2014 until his second period started in 2019, many opinions, suggestions, and criticisms addressed to the president, Jokowi. This research aims to measure the performance of Jokowi as Indonesia’s president by collecting public opinions on social media, peculiarly in an interview video published on YouTube. All comments are scrapped and processed using machine learning tools, which are Python and TextBlob. The results of this research are positive and negative sentiments related to Jokowi. From the research conducted, the most influential positive sentiments of Jokowi are his personality. The negative sentiments gained in the video are about the poor quality of translation and the English skill of Jokowi.
Digital Village: Modelling of Public Wireless Internet Development using Supply Chain Structure Approach
Authors: Wijiyanto  , Nurchim  
Published: March 2021

AbstractThis study aims to describe the design of rural public wireless internet development based on a supply chain structure approach. Now, many new internet services have sprung up in the private, public, business, education, health, and even governmental sectors until considered as the leading global system. Especially in rural areas, the provision of cable internet networks and cellular internet networks have not been able to reach all rural areas, so a new breakthrough is needed, one of which is a public wireless internet network. This research was conducted with a Design-Based Research approach that combines scientific design methods with the problems that occur for internet development in rural areas of Indonesia. The finding that the development of wireless internet in rural areas can be carried out with the concept of a supply chain structure consisting of suppliers (ISP providers of internet sources), manufacturers (local government or village-owned enterprises managing and transmitting wireless internet to wholesaler), wholesaler (installed 5GHz wireless repeater in people residential areas), retailers (installed 5GHz wireless receiver devices from wholesaler and convert to 2.4GHz wireless transmitters installed in every resident’s house) and customers (each resident’s smartphones or notebooks device connected by wireless).
Smart Bumdes: Innovation of E-Collaboration and E-Commerce for Village Economic Development Solution in the New Normal Era (Case Study in Batu City)
Authors: Prabowo A , Arisha F , Triyana D , Baharudin A F 
Published: March 2021

Abstract
The COVID-19 outbreak in Indonesia has burdened society with enormous costs, from the number of deaths, limited activities, and loss of work. The negative effect of this causes global economic crisis. Businesses feel the negative impact of the Corona COVID-19 virus pandemic which threatens the status of the continuity of the business, especially businesses that do not have sufficiently good adaptations, such as businesses owned by BUMDes (Village- owned enterprises). The purpose of this research is to find the latest innovations through Smart BUMDes based on technology (application). The research method used is the Empathy Map method with direct interview techniques with BUMDes and the efforts under them, and refined through the Experimental method to make the application. The results of this study present an online platform called Smart BUMDes which functions as e-collaboration and e-commerce. E-collaboration functions as a forum that facilitates training and business consultation, Controlling, Monitoring and Reporting by related Mnistries, Local Governments, Village Governments (BUMDes and businesses under them). E-commerce has a function as a platform for selling local village products and services. From these two functions, it is hoped that they can build the village economy in the new normal era.