bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study of Solar Radiation Effect on Radio Signal Using Plasma Antenna
Authors: Dagang A N , Azmi F S , Umar R 
Published: February 2021

Abstract
Plasma antenna can be formed by energizing glass tubes which are filled with neutral gases. It works similarly as metal antenna where it can transmit and receive wireless signal. This study aims to investigate the effect of weather focused on solar radiation towards the performance of plasma antenna represented by signal strength. Fluorescent lamp was set as plasma because it used ionized gas as its conducting element instead of metal. Execution of electrical properties measurements need to be done first, in order to obtain discharge current and voltage values, that need to be used into Glomac programming for the generation of electron temperature and electron density. Next, calculations of the plasma properties was performed to derive the value of plasma and collision frequencies. The plasma properties are important parameters to design and simulate plasma antenna using Computer Simulation Technology (CST). Antenna parameters in terms of return loss, gain, directivity and radiation pattern can be simulated using CST. Signal strength experiment was conducted to evaluate plasma antenna performance in terms of its capability to capture the signals and analyse the effect of solar radiation on that particular moment through the rate of power level over time versus solar radiation data. It was observed at the highest solar radiation rate which is 920 V/m, the power level recorded is the lowest value at-172.93 dBm. Therefore, the signal strength received by the plasma antenna shows remarkable changes under the influence of solar radiation.
The Implementation of Log Periodic Dipole Antenna (LPDA) and CALLISTO system on Solar Radio Bursts Observation
Authors: Mohamad Ansor N , Hamidi Z S , Shariff N N M 
Published: February 2021

Abstract
Solar activity is very important to be observed in order to study its effects to Earth’s climate and space weather generally. In order to understand the behavior of the Sun and its activity, developing ground-based instruments is one of the ways to record the occurrence of the activity other than satellites data. We present in this paper our work on the implementation of Log Periodic Dipole Antenna (LPDA). The LPDA has been successfully set up at UiTM Shah Alam, Malaysia in 2016 with high performance with 8.4-meter height and it has achieved gain as high as 7.28 dB. It mainly records solar radio bursts during the occurrence of solar activity and has been operating at frequency range of 45-870 Hz. This project is done under International Space Weather Initiative (ISWI) by using CALLISTO spectrometer at the same frequency range to monitor solar observations in supporting developing countries with latest technologies of instrument. Beneficially in Malaysia, our station contributes half of the data on e-CALLISTO website due to 12 hours Sun exposure compared to other stations in different countries. All types of solar bursts obtained by e-CALISTO are presented in this paper.
A Design of “Postsecondary Options” Android Application for Junior High school Student
Authors: Putra Bhakti Caraka , Ummi Noviriska Hasan Sitti , Wulidatin Noor Khilda , Aminur Rahman Fuad , Alfarizqi Nizamuddin Ghiffari Muhammad 
Published: February 2021

Abstract
The purpose of this study is to develop a postsecondary option-based android application that is used by junior secondary students in determining plans for further study. Planning further studies from junior to senior high school and beyond, certainly requires a consideration. All preparations both externally (school, facilities, environment) and internally (academic ability, understanding of learning), and all of that include in postsecondary options. Postsecondary options are awareness the opportunity to obtain a career and develop experts using various abilities such as grouping careers, the ability to assess themselves, and many more. Optimizing postsecondary options can be applied in technology. The research method used is research and development, which develops Android applications based on postsecondary options in helping student’s postsecondary option. In this application, it contains information about the requirements, curriculum, job opportunities in a number of options for further study of students after junior high school and beyond.
Particle Swarm Optimization based modelling of a surface ship using free running experimental approach
Authors: Wang Y , Chai S , Nguyen H D , Liu J , Ma F 
Published: February 2021

Abstract
System modelling of the surface ship, which could be regarded as a multi-variable parameter estimation problem, has attracted tremendous interests from researchers since it is of key importance to development of ships’ control system. The aim of this study is to utilize the Particle Swarm Optimization (PSO) algorithm to get the optimized solution of hydrodynamic coefficients in the presence of ship’s mathematical model using the space search principle. The motion equations of the ship in four degrees of freedom are formulated to clarify the scheme of the model. After expressing the theory of the PSO method, the system identification of the ship’s motions is conducted to estimate the hydrodynamic coefficients. By using the identified parameters, the mathematical motion model of the free-running ship, namely ‘P and O Nedlloyd Hoorn’, is developed. The comparison between the experiment measurements and simulation trails and attitudes have indicated that the developed mathematical is sufficient and effective to response the ship’s motions. Therefore, it is demonstrated that the PSO based system identification algorithm is capable of conducting system identification and system modelling for the surface ship through free running approach.
Projected changes in wind power potential over China and India in high resolution climate models
Authors: Sherman Peter , Song Shaojie , Chen Xinyu , McElroy Michael 
Published: February 2021

Abstract
As more countries commit to emissions reductions by midcentury to curb anthropogenic climate change, decarbonization of the electricity sector becomes a first-order task in reaching this goal. Renewables, particularly wind and solar power, will be predominant components of this transition. How availability of the wind and solar resource will change in the future in response to regional climate changes is an important and underdiscussed topic of the decarbonization process. Here, we study changes in potential for wind power in China and India, evaluating prospectively until the year 2060. To do this, we study a downscaled, high-resolution multimodel ensemble of CMIP5 models under high and low emissions scenarios. While there is some intermodel variability, we find that spatial changes are generally consistent across models, with decreases of up to 965 (a 1% change) and 186 TWh (a 2% change) in annual electricity generation potential for China and India, respectively. Compensating for the declining resource are weakened seasonal and diurnal variabilities, allowing for easier large-scale wind power integration. We conclude that while the ensemble indicates available wind resource over China and India will decline slightly in the future, there remains enormous potential for significant wind power expansion, which must play a major role in carbon neutral aspirations.
Topography not tenure controls extent of wildfire within Mountain Ash forests
Authors: Adams Mark A , Bell Tina L , Gharun Mana 
Published: February 2021

Abstract
Two high intensity wildfire events, 70 years apart, burnt large areas of Mountain Ash forests in the Central Highlands, Victoria, Australia. Both resulted in Royal Commissions (the strongest form of judicial inquiry in Australia) as to their cause(s) owing to large losses of life and property. Here we tested the hypothesis that site ‘wetness’—determined using a Topographic Wetness Index—is a major determinant of the extent of fire (% of sample points that burnt) within high intensity wildfire events and across tenures. We show that wetness dominated the extent of fire in these forests in both the 1939 and 2009 wildfire events. Mountain Ash forests are now strongly skewed in their distribution, with wetter and older forests favored by protected tenures (e.g. National Parks) designed to meet needs for water and conservation. In 2009, the extent of fire at the stand scale in water catchments and conservation tenures was twice that in 1939. In land tenures with multiple uses (e.g. State Forests), the extent of fire was one-third less in 2009 than it was in 1939. Topographic controls on water availability, and major droughts, will likely continue to dominate the extent and likelihood of fire in these forests.
Lorentz- and permutation-invariants of particles
Authors: Gripaios Ben , Haddadin Ward , Lester Christopher G 
Published: February 2021

Abstract
Two theorems of Weyl tell us that the algebra of Lorentz- (and parity-) invariant polynomials in the momenta of n particles are generated by the dot products and that the redundancies which arise when n exceeds the spacetime dimension d are generated by the (d + 1)-minors of the n × n matrix of dot products. We extend the first theorem to include the action of an arbitrary permutation group P ⊂ S

n
on the particles, to take account of the quantum-field-theoretic fact that particles can be indistinguishable. Doing so provides a convenient set of variables for describing scattering processes involving identical particles, such as pp → jjj, for which we provide an explicit minimal set of Lorentz- and permutation-invariant generators. Additionally, we use the Cohen–Macaulay structure of the Lorentz-invariant algebra to provide a more direct characterisation in terms of a Hironaka decomposition. Among the benefits of this approach is that it can be generalized straightforwardly to when parity is not a symmetry and to cases where a permutation group acts on the particles. In the first non-trivial case, n = d + 1, we give a homogeneous system of parameters that is valid for the action of an arbitrary permutation symmetry and make a conjecture for the full Hironaka decomposition in the case without permutation symmetry. An appendix gives formulæ for the computation of the relevant Hilbert series for d ⩽ 4.
Research on Eco-driving of Signalized Intersection Fleet in Vehicle-Road Cooperative Environment
Authors: Su Dan , Jiang Kun 
Published: February 2021

Abstract
In recent years, traditional motor vehicles have suffered increasingly severe constraints on energy resources. Coupled with the increasingly serious hazards of pollutants emitted by transportation, an important strategic goal for the development of China’s transportation industry has been set for energy conservation and emission reduction. Vehicle-road collaboration technology is a cutting-edge technology in the field of intelligent transportation, which can guide drivers in ecological driving strictly in accordance with the actual traffic environment in which the vehicle is located. Therefore, researchers are paying more and more attention to how to reduce vehicle fuel consumption and emissions. Signalized intersection as an important node in urban roads needs to be studied. However, the focus of its research so far is on bicycles, and most researchers are indifferent to the situation in which vehicles are likely to run together within the intersection. In addition, when establishing an eco-driving model, most researchers will still focus on how to achieve energy conservation and emission reduction only from the perspective of reducing the number of parking times, and do not care about the essential attributes of fuel consumption. As a result, it is difficult for us to better control and quantify the overall implementation effect of the model. Based on this, it is very important to actively establish a corresponding fleet ecological driving model based on the fleet within the signalized intersection in the vehicle-road collaborative environment.
Virtual Modeling of Vision Sensor on Smart Cars
Authors: Zhang Ning-ning , Yang Xiang , Yang Xu , Xine-Yan  , Wang Ya-Ou , Li-Gao  , Wang Xing- Ren 
Published: February 2021

Abstract
In order to build a visual sensor in a virtual environment and simulate a smart car obtaining information from external environment, the OpenGL development environment is established based on the Microsoft Visual C++6.0 language program; then the image acquisition unit and processing unit model is built, and finally the vision sensor model is installed on the car model to realize the virtual modeling of the vision sensor on smart cars, so that the smart car can obtain information from external environment in a virtual manner.
Analysis of Shenzhen Port Container Development Countermeasures under the Background of Guangdong-Hong Kong-Macao Greater Bay Area
Authors: Youlin Li , XinWei Chen , ZhiSen Huang , ZhiTe Wu 
Published: February 2021

Abstract
The construction of the Guangdong-Hong Kong-Macao Greater Bay Area brings new opportunities for the future development of Shenzhen Port, but it also faces many challenges. Due to the large number of ports in the Bay Area, large and small, rich port resources, leading to increasingly fierce competition between ports. Therefore, the article mainly to Hong Kong and Macao Grand Bay Area as the research of environment, analyzes the status quo of Shenzhen Port Container development, followed by The exponential smoothing model is used to predict the container throughput of Shenzhen Port, finally, on the basis of the prediction results, relevant countermeasures are put forward for the better development of container transportation in Shenzhen Port, and the development path of Shenzhen Port in the context of the Greater Bay Area is sought.
Simulation-based emission calculation method for container terminal production operation system
Authors: Liu Bin , Wang Yihong 
Published: February 2021

Abstract
The emission calculation method based on actual energy data and mathematical analytical models have the disadvantages of time-consuming and high cost, and therefore it is necessary to study a system simulation-based method for calculating the emissions of container terminal production operation systems. This paper develops a simulation model of container terminal production operation systems based on the Arena simulation platform. Emission calculation formulas are embedded into the simulation model, which can calculate and output the energy consumption and emissions of ships and handling equipment. To validate the system simulation-based emission calculation method, a container terminal is taken as the research object and a series of simulation experiments are conducted. The main results show that (1) NOx is the main air pollutant and the CO2 and NOx emissions mainly come from ships, which are 90.7% and 80.4%, respectively, and (2) CO2 and NOx emissions during navigation of ships in the waterway are the main part of ship emissions and account for 60.7% and 53.9%, respectively.
Optimal design of building materials logistics transportation scheme in Beijing based on “outside gathering and inside distribution”
Authors: Hong Han 
Published: February 2021

Abstract
Under the national strategy of vigorously promoting transport restructuring and winning “the battle of blue sky protection”, it is of great significance to promote the railway freight to undertake the distribution of goods and materials in big cities, which can alleviate the traffic congestion on urban roads and optimize the quality of urban environment. This paper puts forward the concept and mode of green logistics of “outside gathering and inside distribution“ according to the flow characteristics of production and living materials in cities. It analyzes the market relationship between the production and use of building materials in Beijing, building the optimization model of freight transport scheme based on railway transport, and the logistics transportation scheme of building materials in Beijing is optimized and designed. This paper provides a scientific method for the transportation organization of production and living materials in big cities.
Analysis on the Application of BIM Key Technology in Road and Bridge Construction Management
Authors: Zhang Baocheng 
Published: February 2021

Abstract
With the rapid development of science and technology, BIM technology is widely used in many fields. The application of BIM technology in road and bridge construction management can provide a strong basis for the management decision of the whole process of road and bridge construction, improve the level of road and bridge construction management, and ensure the quality and service life of road construction. In addition, the application of BIM technology can not only shorten the construction period but also save the cost of roads and bridges. BIM technology plays an important role in the construction process of road and bridge engineering.
Analysis of inclined leg angle on stress of V-shaped Pier Rigid Frame Bridge
Authors: Biyu Bao 
Published: February 2021

Abstract
Taking daquanhu super large bridge as an example, the bridge is a prestressed concrete V-shaped rigid frame bridge, full width of bridge of 38.0m, and main girder of single box three chamber section. Through the finite element analysis and calculation, this paper compares the influence of the angle of inclined legs and the spacing of inclined legs on the bending moment value of V-shaped pier, and summarizes the rules, which can provide reference for similar projects in the later stage when drawing up the size.
Study on the longitudinal nonlinear seismic behavior of the arch bridge with steel tubular frame without inner filling
Authors: Chen Yulong , Feng Jia , Li Li 
Published: February 2021

Abstract
The dynamic analysis model of a typical cantilever hollow steel tubular skeleton arch bridge in the western high-intensity region is established to obtain the longitudinal nonlinear seismic performance of the bridge. By combining the N-F 2-D yield surface of each key fiber section of a bridge, the critical section state of a bridge under the action of E2 rare intensity earthquake is evaluated and described, and the overall seismic performance of the structure is evaluated. The research results show that: The results show that the damaged part of the structure under the longitudinal and vertical seismic action is mostly the bottom of the upper arch column, and the upper arch column closer to the arch is more likely to be damaged, which is the weak part of the structure.
Prediction of temperature field of embankment in permafrost region of Qinghai Tibet railway
Authors: LinaWang  , QiangLiu  , YonghaoXu  , MaolinLi  
Published: February 2021

Abstract
Temperature field distribution of Qinghai-Tibet railway is important for analyzing embankment stability. Based on the finite element method, the analysis model of temperature field is developed for predicting the changes in embankment thermal field in the following 40 years. The results show that the permafrost will degenerate to seasonally frozen soil.
Research and Engineering Application of Soft Soil Unloading and Deformation Model
Authors: Xu Wenyu 
Published: February 2021

Abstract
Soft soil is a multiphase medium composed of solid soil particles, pore water, pore gas and combined water film adsorbed on the surface of particle group and colloid between particles. It is widely distributed in coastal, middle and lower reaches of rivers and delta of lakes. Its physical and mechanical properties and engineering characteristics are complex and regional differences are obvious. With the rapid development of social economy and urbanization, it will inevitably lead to serious problems such as urban land tension, traffic congestion and environmental pollution. These coastal cities are the leaders of China’s economic development. After more than 30 years of rapid economic development, the construction scale of these cities in China is also expanding, and the supply and demand of construction land is becoming increasingly tight. The contradiction between supply and demand is more prominent. With the scarcity of land resources and the rapid development of economy, a large number of construction projects in Qianhai area have been started, among which the construction of subway is also on a large scale. The shortage of land resources and the increase of land development make the high density and high strength building development along the subway line. The development of these building properties is bound to appear a large number of complex deep foundation pit projects, and the excavation of deep and complex foundation pit near the side of subway tunnel is a common form of excavation. In practical construction projects, due to the influence of external factors such as complex construction site conditions and urgent time requirements, people often pursue the progress of foundation pit excavation too much in actual construction, ignoring the research and application of mechanical properties of soft soil foundation, which leads to the safety accidents of subway tunnel structure from time to time. This is closely related to the mechanical properties of soft soil with high moisture content, high compressibility and low bearing capacity. Therefore, deep and large foundation pit engineering in soft soil area is prone to heavy engineering safety problems such as underground continuous wall and other retaining structures. Therefore, the further study of the unloading deformation model of soft soil, the physical and mechanical properties and engineering characteristics of soft soil has a positive and important economic value and social role in engineering in the future.
Research of Damper Parameters of Large span Suspension Bridge
Authors: Wenjun Gao , Yi Hangyu , Chen Yulong , Zhang Ben 
Published: February 2021

Abstract
This paper research the parameter selection range of large span suspension bridge dampers. The finite element model of the Puli Bridge was established by using ANSYS software. Under consideration of the pile-soil interaction, the cross analysis of 16 dampers with different parameters under the action of longitudinal + vertical earthquake was carried out. The bending moment and shear force at the bottom of the tower, the relative displacement of the tower and the girder, the maximum speed and the maximum damping force of the dampers under different working conditions are analyzed. Therefore, the suggested range of each parameter of a single damper is proposed.
Simplified Calculation Method of Wharf Bank Slope Stability Considering Old Piles
Authors: Liu Tianyun , Xie Linbo 
Published: February 2021

Abstract
Based on the requirements of durability, a simplified calculation method of wharf slope stability considering the anti-sliding effect of old piles is derived according to the allowable cracks of old piles. Firstly, the acting force between the sliding soil and the pile is assumed to be distributed in a triangle, and the position of the resultant force of each pile is determined. According to the maximum crack width limit of the old pile, the maximum bending moment that the old pile can bear is calculated. According to the maximum bending moment, the maximum horizontal force at the mud surface, where is the slip arc position, can be inversely calculated, then the maximum anti-sliding force provided by the old piles can be obtained, and the stability of wharf bank slope considering the anti-sliding effect of the old piles is checked. In the slope stability calculation of Beira fishing wharf reconstruction project in Mozambique, the simplified calculation method considering the anti-sliding effect of old piles is adopted. The stability coefficient of wharf bank slope meets the requirements, and the extra treatment of bank slope is cancelled, which saves the project investment and construction period.