bluuebunny/crossref_metadata_2025 huggingface dataset:
Investigation of charge trapping mechanism in MoS2 field effect transistor by incorporating Al into host La2O3 as gate dielectric
Authors: Yang Kun , Chen Yanning , Wang Shulong , Han Tao , Liu Hongxia
Published: March 2021

The charge trapping effect plays a key role in multi-bit memory devices and brain-like neuron devices. Herein, MoS2 field effect transistors are fabricated, incorporating Al into host La2O3 as the gate dielectric, which exhibit excellent electrical properties with an on–off ratio in the memory window of ∼106 and a memory window ratio of ∼40%. Furthermore, the charge trapping and de-trapping processes were systematically studied, and the time constants are obtained from time-domain characteristics. Making use of the charge trapping effect, the threshold voltage of the device can be continuously adjusted. The oxide layer trap density and the interface state trap density are extracted using the charge separation method. These theoretical studies provide a deeper understanding of ways to control the charge trapping process, benefitting the commercialization of two-dimensional electronic devices and the development of new charge trapping devices.
Effective picture of bubble expansion
Authors: Cai Rong-Gen , Wang Shao-Jiang
Published: March 2021

Recently the thermal friction on an expanding bubble from the cosmic first-order phase transition has been calculated to all orders of the interactions between the bubble wall and thermal plasma, leading to a γ2-scaling instead of the previously estimated γ1-scaling for the thermal friction exerted on a fast-moving bubble wall with a Lorentz factor γ. We propose for the first time the effective equation of motion (EOM) for an expanding bubble wall in the presence of an arbitrary γ-scaling friction to compute the efficiency factor from bubble collisions, which, in the case of γ2-scaling friction, is found to be larger than the recently updated estimation when the bubble walls collide after starting to approach a constant terminal velocity, leading to a slightly larger signal of the gravitational waves background from bubble collisions due to its quadratic dependence on the bubble collision efficiency factor, although the γ2-scaling friction itself has already suppressed the contribution from bubble collisions compared to that with γ1-scaling friction. We also suggest a phenomenological parameterization for the out-of-equilibrium term in the Boltzmann equation that could reproduce the recently found (γ2-1)-scaling of the friction term in the effective EOM of an expanding bubble wall, which merits further study in future numerical simulations of bubble expansion and collisions.
Irreducible cosmic production of relic vortons
Authors: Auclair Pierre , Peter Patrick , Ringeval Christophe , Steer Danièle
Published: March 2021

The existence of a scaling network of current-carrying
cosmic strings in our Universe is expected to continuously create
loops endowed with a conserved current during the cosmological
expansion. These loops radiate gravitational waves and may stabilise
into centrifugally supported configurations. We show that this
process generates an irreducible population of vortons which has not
been considered so far. In particular, we expect vortons to be
massively present today even if no loops are created at the time of
string formation. We determine their cosmological distribution, and
estimate their relic abundance today as a function of both the
string tension and the current energy scale. This allows us to rule
out new domains of this parameter space. At the same time, given
some conditions on the string current, vortons are shown to provide a
viable and original dark matter candidate, possibly for all values
of the string tension. Their mass, spin and charge spectrum being
broad, vortons would have an unusual phenomenology in dark
matter searches.
Fixed point theorems under Rhoades and Reich contractive conditions in complete cone metric spaces
Authors: Sunarsini  , Apriliani E , Yunus M
Published: March 2021

One of the extended metric space concepts is a cone metric space. The cone metric space was first proposed by Guang and Xian in 2007. In their research, they introduced Banach fixed point theorems in complete cone metric space, namely by analogizing the fixed point theorems in complete metric space. They add normal properties to the cone set. However, Rezapour in 2008 refuted Banach fixed point theorems in cone metric space by eliminating normal properties of the cone set. For this reason, we will investigate the existence and uniqueness of Rhoades and Reich contractive mappings in cone metric space by referring to the research of Guang and Rezapour.
Forecasting electricity loads on national holidays in East Kalimantan
Authors: Hasanah P , Wiradinata SA , Azka M , Sari CA
Published: March 2021

In the last decades, electricity becomes essential problems in East Kalimantan. Some previous research has conducted to assess the power plant systems and to examine the future electricity demand during the period. Moreover, there are some particular events such as national holidays that bring different impacts on the electricity demand. Forecasting electricity loads on national holidays will give significant information to the stakeholders in order to prevent the power outage of electricity. Two samples of hourly electricity loads in national holidays; New Year and Independence Day during 2015-2018 is analyzed in this research. Furthermore, the SARIMA model is used to estimate the suitable model to predict the future electricity loads. The result shows that SARIMA (2,2,0)(0,1,0)24 and SARIMA (1,1,0)(1,1,0)24 are the appropriate model for New Year and Independence Day, respectively. In addition, it is predicted that in 2020 the electricity demand on New Year will rise to 400 MegaWatt based on 95% of confidence intervals. On Independence Day, the electricity consumption will reach 300-450 MegaWatt in 2019 and 2020 with significant growth up to 10% each year.
The Domination number of 2-neighbourhood-corona graphs
Authors: Darmaji  , Rinurwati  , Wahyudi S
Published: March 2021

Given a simple graph G. Vertex set of G is V, and edge set of G is E. Domination set, denoted by S, that is subset of V such that every vertex in V which is not element of S has distance one to S. The least number of the elements of S is the domination number of the graph G, that is ϒ(G). Let G1 and G2 be a simple graph. G1 has n1 vertices, and has m1 edges. G2 has n2 vertices, and has m2 edges. We defined an operator called neighbourhood corona, denoted by a star ‘*’. Graph G1*G2 is a new graph obtained by making ni copies of second graph and for each i make connecting all vertices in i-th copy of second graph G2 to neighbours of vi = 1, 2, …, n. Furthermore, new graph 2-neighbourhood corona G1*2G2, has n1 copies of G2 and for each i make connecting to all vertices of ith copy of G2 to neighbours of vi, i = 1, 2, …, n. In this research, we determined ϒ(Gi*2G2) where G1 is a complete graph Kn or Cycle Cn, and G2 is K1 or P2. Furthermore, we determined ϒ(G1 *mG2) due to domination number of complete graph Kn and cycle Cn. Since ϒ(Kn) = 1 then ϒ (Kn*mK1) = 1 + m. Furthermore, ϒ(Kn*mP2) = 1 + m. Since

ϒ
(

C
n

)
=

[

n
3

]

then

ϒ
(
C

n

*

m
K

1

)
=

[

n
3

]

+

[

n
3

]

m
=

[

n
3

]

(
1
+
m
)
=

ϒ
(
C

n

)
(
1
+
m
)

. Furthermore,

ϒ
(
C

n

*

m
P

2

)
=

[

n
3

]

+

[

n
3

]

m
=

[

n
3

]

(
1
+
m
)
=

ϒ
(
C

n

)
(
1
+
m
)

.
The efficiency of Spatial Durbin Model (SDM) parameters estimation on advertisement tax revenue in Malang City
Authors: Atikah N , Widodo B , Rahardjo S , Mardlijah  , Kholifia N , Afifah D L
Published: March 2021

The Spatial Durbin Model (SDM) is a development of the Spatial Autoregressive Model (SAR), in which the effect of spatial lag takes into account on the independent and dependent variables. In determining the parameter estimations in the SDM model, it is necessary to determine appropriate method. The estimation methods that can be used are Maximum Likelihood Estimation (MLE), Bayesian, Generalized Method of Moment, and Method of Moment (MM). In this paper, we will determine the best estimation method for obtaining the advertisement tax revenue model. We further conduct mapping the area to optimize advertisement tax revenue in Malang. From the comparative analysis process of the MLE and MM methods, the results show that the MLE method is a suitable method for estimating SDM parameters in advertisement tax revenue data in Malang City. From the variables that have been used to the model of SDM, all variables significantly affect the advertisement tax revenue. The mapping results show that the Gadang and Bandulan villages are the places with the most potential to increase advertisement tax revenue. This is because those villages are border areas in which many vehicles pass the border, and there are also many companies/industries.
Determining the optimal window length of the time-varying copula parameter: a simulation study
Authors: Ahdika Atina , Rosadi Dedi , Effendie Adhitya Ronnie , Gunardi
Published: March 2021

A time-varying copula is a multivariate cumulative distribution function that can accommodate the temporal dependence of random variables. To capture the temporal dependence of random variables using a copula, we can form a time variation on copula parameters. Some studies reported that a function of a latent variable following an autoregressive process defines time-varying copula parameters. The process consists of an autoregressive coefficient describing the influence of the parameters in previous times and a forcing variable representing the relationship between the marginal variables which utilize previous information over a certain number of window lengths of the observations. Previous studies reported that ARMA(1,10) defines time-varying copula parameters. However, the optimal parameters of time-varying copulas do not always require ten last observations. Therefore, we determine the optimal window length of the time-varying copula parameter by conducting a numerical simulation on four types of copula with different strengths and directions of dependence. The window length is defined as a new parameter and the optimal parameters can be obtained by finding the values producing the smallest AIC. We also provide a numerical simulation on how to improve the accuracy of the predicted series by changing the mean and standard deviation of the residual pairs.
Edge metric dimensions of neighbourhood corona graph containing dominant vertices
Authors: Rosyidah N M , Rinurwati
Published: March 2021

Connected graph G = (V(G), E(G)) with V(G) = {υ1, υ2,..υ
n
} and a graph H and an ordered set Z = {z
1,z
2,…,z
k} £ V( G) are given. The set Z, for which the representations of every two distinct edges e1, e2£E (G) with respect to Z are distinct, is called edge resolving set. The edge resolving set with minimum cardinality is called edge metric basis for G, its cardinality is called edge metric dimension of G, and is denoted by e d im( G). Let H
1, H
2,…,H
n be copies of graph H. The neighbourhood corona between G and H, G*H, is obtained by taking G and |V(G)| copies of H, then making all vertices in the ith copy of H adjacent to all neighbours of v
i
£ V(G), with i £ { 1, 2,…,n}. In this paper, we determine and analyze edge metric dimensions of neighbourhood corona between G and H, edim(G*H), where G is a graph containing dominant vertices, that is G £ {K

n
, S

n
, F

n
, W

n
} and is graph k
1.
Extended use of error-free transformation for real matrix multiplication to complex matrix multiplication
Authors: Kazal Nurul Yakim , Mukhlash Imam , Sanjoyo Bandung Arry , Hidayat Nurul , Ozaki Katsuhisa
Published: March 2021

The presence of rounding errors is frequently inevitable when performing arithmetic operations in computers due to the use of floating-point number system whose elements have finite precision. Consequently, error-free transformation algorithms are proposed as solutions, and a particular instance of these is the error-free transformation algorithm for real matrix multiplication. Based on the previously mentioned algorithm, this study proposes two error-error free transformation algorithms for complex matrix multiplication. By conducting the numerical experiment, one finds that the combination of both proposed algorithms with an accurate summation algorithm generates the most accurate results, but it also suffers from a notable increase in the computing time ratio. On the other hand, the second proposed algorithm, which is simply another form of the first one with the change of order in summation, combined with the pure floating-point addition produces results that are nearly as accurate as those generated by the former combination. Since these results are achieved with significantly smaller computing time ratio, then the study concludes that the last combination is the best method for complex matrix multiplication in terms of accuracy and computing time efficiency.
Model predictive control in optimizing stock portfolio based on stock prediction data using Holt-Winter’s exponential smoothing
Authors: Agustina C S , Asfihani T , Ginting R R , Subchan S
Published: March 2021

This study aims to solve an optimization problem on stock portfolio. There are two main subtopics of this research, namely stock price prediction using Holt Winter’s Exponential Smoothing method and stock portfolio optimization using Model Predictive Control (MPC) method. The steps that have been taken are: collecting and analysing stock price data, determination of smoothing parameters and stock price prediction, calculation of stock price prediction returns, determining the stock portfolio model and system constraints, converting the objective function into a quadratic programming form, and initialization of optimization parameters and program simulation. Based on the simulation results, all control variables are within the predetermined constraints. The application of MPC in optimizing all capital in a portfolio based on stock price predictions can provide satisfactory results. This is represented by the decisions given by the MPC which resulted in the investor’s total capital increasing closer to the expected target.
Classification of security quality level using Fuzzy Logic study case: Balikpapan City
Authors: Fathurahmah Naufal , Pancahayani Sigit , Hasmi Abrari Noor , Prihasto Bima
Published: March 2021

A liveable city is a city with a comfortable environment that gives its residents a sense of perfection to live and ease to do various activities. Balikpapan is one of major cities whose has the third-largest population in the province of East Kalimantan consisting of 6 districts namely, South Balikpapan, East Balikpapan, North Balikpapan, West Balikpapan, Central Balikpapan, and Balikpapan City. The consequence that arises from the large population is the increase in crime that affects the liveability in terms of security quality. In this study, Mamdani Fuzzy Logic is used to investigate the level of security quality of each sub-district in this city based on the crime figures. Moreover, the types of criminalities are categorized into four kinds, namely fraud, theft, immoral violence, and other crimes. Based on the result, it was found that the order of sub-districts with the best level of security is Central Balikpapan which is followed by Northern and Eastern Balikpapan with fairly good security status. Meanwhile, sub-districts with lax security are Western Balikpapan, Balikpapan City and Southern Balikpapan.
Kolmogorov-Smirnov Goodness-of-Fit test for identifying distribution of the number of earthquakes and the losses due to earthquakes in Indonesia
Authors: Oktaviana Pratnya P , Irhamah
Published: March 2021

Earthquakes of high magnitude often result in large casualties and huge economic losses in Indonesia. An earthquake risk assessment must be carried out. The risk assessment process requires a structured approach. This paper is containing of the first step of risk assessment using actuarial-statistical method. The data used as research variables in this paper are the number of earthquakes and the losses due to earthquakes. The earthquakes data used are earthquakes with magnitude > 5 Richter Scale. Data is collected within the last 40 years, from 1980 to 2019. Data is collected from Indonesian Disaster Data and Information, and NOAA National Centers for Environmental Information (NCEI). Descriptive statistics analysis obtains that the most frequently earthquakes with magnitude > 5 Richter Scale occurred in Indonesia in 2004, where as it is known that at the end of 2004 an earthquake with a magnitude of 9.1 Richter Scale occurred in Aceh which caused the highest loss, which was around 147485.500 billion rupiah. Normality test of the variables results that the number of earthquakes and the losses due to earthquakes are not normally distributed. Kolmogorov-Smirnov Goodness-of-Fit test results that the number of earthquakes follows Gamma Distribution with shape parameter α = 1.800 and scale parameter β = 2.236; while the losses due to earthquakes follows Power Function Distribution with shape parameter α = 0.072, and boundary parameter a = 0, b = 2.810 x 105.
The reduction of CO2
emission using the optimal control approach
Authors: Fitria Irma , Anggriani Indira , Irawan Ferdo
Published: March 2021

Indonesia is the country that has the largest tropical forest with a wide variety of biodiversity. Forests are natural resources that have an important role in human life. However, the existence of forest is currently decreasing along with the increasing of industrialization. The depletion of forest area and the expansion of industrialization can cause the increasing of CO2
emission. Therefore, it is necessary to control forest resources and industrial development, thus the level of CO2
emission can be minimized. In this study, the dynamics of CO2
emission, forest area and industrialization are modelled mathematically. In order to reduce the level of CO2
emission, we design two control variables in the model which are reforestation and government policy. The optimal control theory using Pontryagin Minimum Principle is applied to find the optimal level of control variables. Furthermore, numerical simulation is given to illustrate the performance of the optimal control variables. Based on the simulation result, the level of CO2
emission with controls is less than the level of CO2
emission without controls. This result suggests that providing reforestation and government policy can reduce the concentration of CO2.
The Environmental Safety of Fish Products
Authors: Popova N V , Pavlova A I
Published: March 2021

The anthropogenic pollution of the environment leads to the discharge of various pollutants into water ecosystems, which further accumulate in fish and other hydrobionts. Fish is a valuable traditional food source for humans, and the quality assessment for fish products is therefore a relevant problem. This article deals with researching the content of pollutants in game fish, in particular in the Siberian whitefish. The goal of this work is to identify the content of heavy metals and cesium 137 in the muscle tissue and organs of the fish (whitefish) caught in the lower reaches of the Lena River. Research methods: The sampled materials were tested for heavy metals using the atomic absorption method. The content of Cs 137 was established using the spectrometric method. Results: the average concentration values for heavy metals (mg/kg) (Pb, Cd, Hg) in the muscle tissue and organs of the whitefish do not exceed the limits. The average content of lead in muscular tissue is 0.0135±0.0025 mg/kg, cadmium - 0.0076±0.0014 mg/kg, and mercury 0.0011±0.0000 ug. Arsenic was not found in the muscle tissue and organs of the fish. The highest relative content of heavy metals was observed in the livers of the whitefish. The content of cesium 137 is insignificant and below the allowed level of radionuclide activity. Conclusion: The analysis of the research results shows that the contents of heavy metals and cesium 137 in the fish caught in the lower reaches of the Lena do not exceed the standard levels. The on-going pollution of lakes and rivers within the Lena watershed calls for regular monitoring of heavy metal and radionuclide content and accumulation in game fish.
Post-occupancy Evaluation of Yan’an Revolutionary Site from the visitors’ perspective based on multivariate statistical analysis
Authors: Liu Daohui , Wu Nong , Sun Yiyou
Published: March 2021

Taking the Yan’an Revolutionary site as the research object, constructing an evaluation indexes system, collecting data onto the three nationally famous Yan’an Revolutionary sites in Zaoyuan, Yangjialing and Wangjiaping, and using multivariate statistical analysis methods of post-use evaluation research. Factor analysis proves that the Yan’an Revolutionary Site Exhibition and Evaluation System is basically correct. One-way ANOVA tests analysis shows that people of different ages have significant differences in the five indicators in supporting services, the four indicators in the environment, all the indicators for auxiliary display, and the four indicators displayed by the main body. In addition, the higher the educational background, the more significant the difference in the four indicators of supporting services. The results of random forest algorithm analysis of evaluation indicators and overall satisfaction in the Yan’an Revolutionary Site show that there are four out of eight indicators for supporting services; four out of ten indicators for main display; two out of five indicators for auxiliary display items; two of the seven indicators of environmental atmosphere, these indicators have a great impact on the overall satisfaction from visitors.
Optimization Strategy of University Campus Outdoor Environment in Cold Area
Authors: Jia Jiaojiao , Ma Huizhi , Pan Runfeng
Published: March 2021

The paper aims to construct the outdoor space environment which is suitable for the cold climate, meets the campus structure and natural conditions of university, and meets the needs of the activities of teachers and students. On the basis of a large number of actual investigation and case collection, this paper studies the culture, landscape elements and design methods of the outdoor environment of universities in cold areas. The paper analyzes and summarizes the trend and existing problems, provide some feasible suggestions and strategies for the design of outdoor space environment in cold universities during the contemporary economic and social conditions.
Ecological Optimization of Spatial Patterns of Water Conservancy landscape in Qilian Mountains based on land processes: a case study of Zamu River Basin in Upper Shiyang River Basin
Authors: Cheng-xiang Ma , Jun-de Wang
Published: March 2021

Based on the relation of the ecological landscape to its ecological function, this paper takes Zamu river basin in upper Shiyang river as an example, which located in the cold region of Qilian Mountains in northwestern of China. With the use of the remote sensing data, the spatial information processing technology of GIS, suitability evaluation with the overall optimization of land use patter is applied to ascertain the function zoning and ecological pattern components of land use, to develop approaches to the ecological optimization of the spatial pattern of water conservation landscape in the mountains region. The results show that: With Zamu river basin as the research object, based on the source of the water conservation ecological landscape of frozen soil and water conservation forest, considering the zonal distribution of the frozen soil and water conservation forests in order to classification of factors such an slope, elevation, vegetation cover type and so on, we divided Zamu river valley into five ecological function regions. There are the water conservation core, water conservation buffer, water conservation excessive area, water conservation area and human development and utilization of the edge area. Also we put forward the countermeasures for protecting the each function.
Analysis of Indoor Thermal Environment of Korean-Chinese Dwellings in Yanbian Area in Winter
Authors: Gao Songhua , Jin Guanghu , Quan Haogang
Published: March 2021

In order to understand the construction technology characteristics of traditional Korean-Chinese dwellings in Yanbian area, traditional Korean-Chinese earthen and brick houses were used as the research objects in the analysis of the indoor thermal environment. In this study, temperature and relative humidity in each room were separately tested. Due to the particular heating method applied in the traditional Korean-Chinese dwellings, the indoor temperature and relative humidity are relatively stable, i.e. average temperature is maintained above 16°C, and average relative humidity is maintained at about 50%. The test results can effectively verify the superiority of Korean-Chinese traditional construction experience and technology.
Comprehensive Evaluation and Analysis of Spatial Dynamic Transition of Air Pollution
Authors: Fangfeng Li , Jieping Cai , Zicen Liao
Published: March 2021

The prevention and control of air pollution has a long way to go. This paper makes a comprehensive evaluation of air pollution and explores its spatial distribution characteristics in order to provide suggestions for environmental control. In this paper, a comprehensive evaluation index is constructed by factor analysis method, and Moran’s I index is calculated to analyze the spatial distribution and dynamic transition of air pollution. The results show that there is a positive spatial correlation of air pollution in China, and it has a high degree of spatial stability. It is possible to alleviate the pressure on the general atmospheric environment by improving the environment in highly polluted areas.
Study on 3D printing based on UAV oblique photogrammetry
Authors: Yang Jingming , Yan Guihai , Geng Pei
Published: March 2021

UAV oblique photogrammetry can quickly reconstruct a three-dimensional real-scene model of an object, and the 3D printing technology based on the principle of additive manufacturing can print a digital three-dimensional model into a 3D object. These two high-technologies realize the mutual conversion between virtual (digital) and reality, and have good potential application value. This study takes the Zhuhai Sports Center Natatorium as an example to study oblique photography and 3D printing technology. We reconstructed the high-precision 3D real-scene model of the natatorium, and printed a 3D solid model of the natatorium with high reduction and rich details. Finally, we explored the establishment of oblique photography and 3D printing workflow.
Renewal Design of Urban “Gray Space” Based on Sustainable Development in The Post-epidemic Period
Authors: Li Jiaqi
Published: March 2021

By discussing the importance of the mobile individual economy and renewing urban “gray space” to cities in the sustainable development of cities in the post-epidemic period, it leads to a view that combines the protection of urban mobile individual economy and renewing urban “gray space”. Taking the renewal and reconstruction of the “gray space” under the Juzizhou Bridge in Changsha City as a design case, the feasibility of the viewpoint is verified by establishing a model to restore the site.
Research on urban commercial complex design based on ecological concept-A case study of The Roof in shanghai
Authors: Chen Suliu , Sun Yunrui , Lu Ming , Jiang Maomin
Published: March 2021

Urban commercial complex, as a kind of composite building with multiple functional spaces, is becoming the main body of the development of urban commercial buildings. It is of great significance to apply the ecological architectural design concept to the design of urban commercial complex. Taking Shanghai The Roof commercial complex as an example, this paper shows the application of ecological building technology and methods in commercial complex, and discusses the theory and strategy of integrating ecological building concept into architectural design, so as to provide some reference for the ecological design of urban commercial complex.
Finite element analysis of flexural performance of different fiber reinforced recycled concrete beams
Authors: Cheng Yang , Pei Changchun
Published: March 2021

In this paper, the influence of different kinds of fiber on the mid-span bending moment and deflection of the regenerated concrete beam under the initial cracking and yielding state is studied by ANSYS finite element simulation analysis. The results show that different kinds of fibers have little influence on the mid-span bending moment of the regenerated aggregate concrete beam at the initial cracking, and have a great influence on the deflection value at the initial cracking, among which the reinforced effect is obtained in the group mixed with steel fiber. The mid-span bending moment and deflection of the trabeculae at the yield of the trabeculae are reduced by the addition of different kinds of fibers.
Methods of As-is BIM Reconstruction Using Point Cloud Data for Existing Buildings
Authors: Wang Ting , Xiong Zhaoyang
Published: March 2021

In recent years, as the construction industry shifts from the construction of new buildings to the maintenance and use of existing buildings, the demand for creating Building Information Modeling(BIM) has continued to grow. This article summarizes various research work in different fields and gives an overview. This paper introduces the current research status of creating As-is BIM, then summarizes the corresponding algorithms and data processing methods for creating As-is BIM using 3D reconstruction technology; finally, the detailed research progress and the existing research results and knowledge gaps are discussed, and potential future development opportunities are proposed.
Analysis of Typical Old Building Reconstruction and Reinforcement
Authors: Zhang Chunmei , Zhang Mingyue , Zhang Wanlai , Jin Ziwei
Published: March 2021

In recent years, the rapid development of China’s economy makes the existing building stock soaring, many of which have the service life of more than 10 years, thus emerging more and more hidden diseases, diseases and other quality problems urgently need to be reinforced. This paper around a multilayer cast-in-situ reinforced concrete frame structure of the old buildings, through the inspection process, the conclusion and the reinforcement scheme of combing the following conclusion: after old buildings reconstruction must be strictly according to the professional testing department of the appraisal report issued to reinforce the transformation processing, transformation of conditions in addition to meet the design requirements, the feasibility of economic cost should also be considered. The old buildings that cannot meet the above two basic conditions should not be changed or reinforced rashly.
Experimental research on cement-soil mixture ratio of track foundation cement mixing pile
Authors: Zheng Airong , Wang Jiannan
Published: March 2021

In order to ensure the feasibility and economy of the construction scheme of cement mixing piles for track foundation, a cement-soil indoor mix ratio test was carried out. Selected ordinary Portland cement and sulfate-resistant cement, groundwater and tap water, three mixing ratio experiments were carried out. The experimental study found that the cement-soil has high strength, which can fully meet the bearing capacity requirements of the track foundation, and the cement content can be appropriately reduced. The strength of the solidified soil increases with the increase of the cement content, and the groundwater has no adverse effect on the strength of the cement-soil. The strength of solidified soil with P.HSR 42.5 cement is not significantly higher than that of P.O42.5 cement. Even in BDQ1 and BD4 track foundations, the strength of solidified soil with P.O42.5 cement is significantly higher than that of P.O42.5 cement.
Research on the application of reverse method in high-rise building construction
Authors: Zhang Mingyue
Published: March 2021

In high-rise building engineering, a variety of construction techniques can be applied, and reverse practice is one of the common ones. Based on this, in order to improve the quality of the project as the purpose, to the application of technology as the content, the construction experience is summarized. This paper first introduces the reverse method, then expounds the classification standard of this method and the characteristics of different types of techniques. Finally, the application means of the technology are summarized from the aspects of foundation engineering and concrete engineering.
Technical Application of Nanocomposite in Construction
Authors: Zhe Zhang , Qijian Yang , Kejuan Wu
Published: March 2021

The particle size of nano-ions is very small, and the specific surface area is large. It has the characteristics of significant and small size effect, so it is more commonly used in construction at present. This article starts with the progress of nanocomposite technology in new functional building, and explores its specific ideas in new building materials through in-depth analysis.
Analysis And Research on The Factors Influencing The Design of Assembled Buildings
Authors: Cui Yanqing , Liu Ying , Diao Qianhong
Published: March 2021

Based on the previous research on the current situation of the application of assembly design, this paper identifies 14 influencing factors that cause the problems of assembly design by combining the literature research method and the Delphi method. In order to ensure the accuracy and appropriateness of the influencing factors, a questionnaire survey was conducted among the professionals and technicians who had worked on assembly building design projects, and 10 major influencing factors were selected by the magnitude of the influencing factors. Then, using expert interviews, the 10 factors were ranked in terms of their application to the assembly building design process, and finally five important factors influencing the assembly building design process were derived. The theoretical basis for future research on the optimization of assembly building design was laid.
An Empirical Study on the Influencing Factors of the Total Output Value of Construction Industry Based on Spss
Authors: Yufang Shi , Jingwen Zhu
Published: March 2021

The construction industry is a pillar industry of the country. The sustainable development of the national economy will depend to a large extent on the orderly and reasonable development of the construction industry. This study takes the total output value of the construction industry as the research object, combined with the characteristics of the Chinese construction industry, and uses SPSS analysis software to conduct targeted empirical research. The following conclusions are obtained: (1) The total output value of the construction industry is greatly affected by the gross domestic product, the net fixed assets of the construction industry, the wages of construction workers and the internal expenditures of construction R&D funds. (2) Compared with the internal expenditures of construction R&D funds, labor input has a greater impact on the total output value of the construction industry, indicating that the behavior of technology to change the market is not obvious. (3) By increasing capital investment and expanding the labor market, the total output value of the construction industry can be effectively increased and the high-quality development of the construction industry market can be promoted.
Analysis of Mechanical Characteristics of Walls of Masonry Structure House under Dynamic Load
Authors: Huang He , Zou Chuanlong , Lan Zhijun , Chen Shan
Published: March 2021

Research and analysis on the walls of masonry structure houses in a certain area of north of Guangxi. The house walls are divided into three types: pure walls, walls with windows and walls with doors, and use ABAQUS to design the corresponding wall models, Adopt the horizontal periodic reciprocating load of different magnitudes to calculate the mechanical performance of the wall, and study the stress change characteristics and crack development law of the wall. The results show that: (a) Under load, the stress concentration of the wall is greatly affected by the hole. The larger the hole, the more obvious the stress concentration. (b) Under the load, the cracks change with the holes in the wall, and the cracks in the non-porous wall show a straight shape. As the wall openings appear and become larger, the cracks gradually change from a straight shape to an X shape, and then It becomes the law of V-shaped and inverted V-shaped.
Structural Damage Identification Based on Sensitivity Analysis and Sparse Constraint
Authors: Fan Qin
Published: March 2021

In the problem of structural damage identification, only a few elements or substructures are damaged, which means the damage of the structure has sparsity. Hence, this paper proposed a structural damage identification method based on sensitivity analysis and sparse constraint. This method established the sensitivity equations through the first-order sensitivity analysis of the structure. Then a damaged elements compression method was used to reduce the number of damaged elements. And the original problem was transformed into a constrained optimization problem with the L1 norm of damage coefficients as the objective function to describe the sparsity. Finally, the results of a numerical example showed that the method can effectively identify single-damage and multi-damage conditions with great robustness.
Experimental study on seismic performance of steel reinforced high-strength concrete composite columns
Authors: Yang Yong , Wang Chen , Chang Hao , Xue Yicong
Published: March 2021

In order to combine the advantages of steel reinforced concrete column, high-strength concrete and precast structures, a novel steel reinforced high-strength concrete composite column is presented in this paper. With the aim to explore the seismic performance of this composite column, three column specimens were designed and tested under cyclic loading. The cyclic behavior of test specimens was evaluated through the failure patterns, hysteresis loops, skeleton curves, energy dissipation, stiffness degradation and displacement ductility. The test results indicated that the shear failure could be found in the specimens subjected to low aspect ratio, and the rest specimens all failed in flexural-shear failure. The initial stiffness and bearing capacity decreased with the increasing of aspect ratio, and the energy dissipation capacity and displacement ductility increased with the increasing of aspect ratio.
Dynamic mechanical properties of jointed soft rock samples subjected to cyclic triaxial loading: a FEM-DEM-based study
Authors: Liu Mingxing , Liu Enlong , Feng Jili , Zheng Qingsong , Fu Jie , Luo Wenjun
Published: March 2021

In order to investigate the fatigue behavior of jointed soft rock samples with different joint dip angles, cyclic triaxial tests under different stress amplitudes and confining pressures were numerically simulated using the combined finite-discrete element method (FEM-DEM). The dynamic strength and deformation rules were revealed, including the masing effect, the ratcheting effect, the volumetric strain properties and the failure modes influenced by joint dip angles. During the first hysteresis loop, the nonlinearity of the loading curve is much stronger than that in subsequent cycles, and the damage and deformation are almost the most, which demonstrates that the effect of stress history on soft jointed samples subjected to cyclic loading is great, especially the first loading cycle. When the applied static and dynamic maximum deviatoric stress are the same, the vertical compressive stress of the dynamic case is found to be lower than that of the static case, and the vertical tensile stress exists in some local position, which may be the reason why the cracks can increase and propagate gradually when the dynamic maximum stress is lower than the static strength.
Theoretical Analyses and Experimental Research on Transmission of Electromagnetic Wave Passing through Concrete Materials Surface
Authors: Zhou Daochuan
Published: March 2021

Simplified theoretical model of electromagnetic wave propagation on concrete materials surface is established first by only considering the normal incidence case. In order to investigate the impact of concrete component to the wave transmission, concrete materials specimens with different composite were casted, which were tested by electromagnetic pulse testing method. Study shows that the transmission rate is only relevant with the concrete materials relative dielectric parameter. The greater relative dielectric constant, the smaller transmission rate in materials surface is. Among all this concrete casting components, unit volume water content has the most obvious influence on transmission rate. To change the transmission rate of electromagnetic wave, it is necessary to control the unit volume water content in concrete materials design process.
Study on the axial compression performance of partially prefabricated steel concrete columns after fire
Authors: Yang Yong , Yao Xukun , Zhou Pan , Xue Yicong
Published: March 2021

In combination with the advantages of steel reinforced concrete columns, high strength and high performance concrete and precast assembled structures, a new type of partially precast assembled steel reinforced concrete columns (SRHCC) was proposed in this paper. In order to study its post-fire axial compression performance, the finite element analysis software ABAQUS was used to simulate its temperature field under standard fire based on experiments. The results show that the core temperature of the specimen increases with the increase of the thickness of the section steel protective layer and decreases with the increase of the firing time. On this basis, the limit equilibrium theory was used to propose the formula for calculating the residual carrying capacity of SRHCC after fire. The calculated results were close to the test results and tended to be safe.
Seismic Demand Analysis of Stacked Box Structure in Battery Storage Power Station
Authors: Li Sheng , Lu Zhicheng , Zhu Zhubing , Lin Sen
Published: March 2021

The modular construction of building manufactures most part of a building in factories and assemblies the modular units in construction site. It reduces the construction period and has less impact on the environment. The self-supported modular building has been adopted in hotel buildings, hospital buildings and school buildings, et al.. However, due to relatively short history of application, the modular construction has not beenwidely used in multi-storeys industry building. This paper proposed the application of modular structure in electrical installations. In current practice, theenergy storage station installs dozens of modular battery container on ground. When these container boxes are stacked together to form multi-storey structure, land occupation can be significantly reduced. On the other hand, this building manner will make the structural more vulnerable in earthquake. This paper investigated the performance of the structure during earthquakes and found that increasing the structural rigidity under lateral load was necessary. The analysis result also provided suggestion on the shear demand of inter modular connector.
Research on the secondary design of prefabricated buildings based on Three-Dimensional
Authors: Wang Yamin , Li Teng , Su Jizhi , Cheng Nan , Liu Zhong , Wu Hailiang , Zhang Wuchen
Published: March 2021

With the improvement of design requirements and computer technology, the three-dimensional design with multi-professional collaborative design, refined design and engineering digitization as the core, is being popularized and used in the substation engineering design of State Grid Corporation. This paper will use the three-dimensional software to deepen the design of prefabricated buildings, and refine assembly building design, embed pipeline and set openings reasonably, which would reduce the site labor input, shorten the construction period, and reduce the site construction risk, and improve the quality and technological level of engineering construction at the same time.
The Application of Cohesive Element Method in the Stability Analysis of Jointed Slope
Authors: Ma Liangliang , Peng Kai , Ye Xiangfei , Liu Yaolai , Wang Xiaoping , Li Xueyong
Published: March 2021

a coupled numerical method (FEM/DEM) is generated to model the complete fracture processes of rock material. cohesive elements are inserted along the boundaries of the discretized elements to model the fracture initiation and propagation in rock material. Then this method is applied to the jointed slope, and the stability of the slope under different joint cohesion is studied. By comparing theoretical values and numerical results, it is verified that this numerical method can effectively and reliably study the stability of jointed slopes.
Influence of Different Number of the Open Exhaust Outlets in Tunnel Lateral Exhaust System on Smoke Exhaust Effect
Authors: Huang Yang , Zhang Li , Han Xuefeng
Published: March 2021

In this paper, firstly, the parameters of the tunnel fire model are set up, the tunnel model is established, the reasonable grid is divided, and the appropriate fire power is selected. Secondly, the data of exhaust mode, layout position, exhaust power and wind speed of exhaust outlet of lateral exhaust system are selected reasonably. Finally, by using the FDS simulation software, the motion, visibility, smoke spreading distance and temperature of the tunnel fire smoke are simulated by changing the number of smoke vents opened in the lateral exhaust system under the same fire environment. The result of the simulation shows the number of open smoke outlets is 4 groups(upstream 1 group, downstream 3 groups), the smoke control effect is the best.
The hindrances of using modular constructions in Sichuan Province of China: A comprehensive literature review
Authors: Zhou Zhenquan
Published: March 2021

In global construction markets, environmental sustainability plays a significant role in the sustainable development goals (SDGs) presented by the United Nations. To improve building sustainability, an increasing number of investigations have indicated the effectiveness of replacing the cast-in-place building method with modular constructions. However, the practical promotion of modular constructions has been facing various obstacles, especially for those developing countries. This article aims to explore the main hindrances of using modular constructions in the Sichuan Province of China, where the construction conditions are more complicated than other Chinese regions. Through a comprehensive literature review, dozens of previous studies on the barriers of promoting modular constructions outline the critical hindrances in Sichuan’s construction industries. The top five interdependent factors are related to the higher initial costs, insufficient working experiences, high degree of dependency on cast-in-place methods, complexity of stakeholder management, and defective policy support. The research findings can assist in promoting the local modular constructions more smoothly, which can efficiently improve the environmental sustainability of Sichuan under SDGs. To consolidate the research findings and supplement other potential barriers, a formal questionnaire on cultural resistance of ethnic minority groups in Sichuan is required for further investigation.