bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dynamic community discovery via common subspace projection
Authors: Yu Lanlan , Li Ping , Zhang Jie , Kurths Jürgen 
Published: February 2021

Abstract
Detecting communities of highly internal and low external interactions in dynamically evolving networks has become increasingly important owing to its wide applications in divers fields. Conventional solutions based on static community detection approaches treat each snapshot of dynamic networks independently, which may fragment communities in time (Aynaud T and Guillaume J L 2010 8th Int. Symp. on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (IEEE) pp 513–9), resulting in the problem of instability. In this work, we develop a novel dynamic community detection algorithm by leveraging the encoding–decoding scheme present in a succinct network representation method to reconstruct each snapshot via a common low-dimensional subspace, which can remove non-significant links and highlight the community structures, resulting in the mitigation of community instability to a large degree. We conduct experiments on simulated data and real social networking data with ground truths (GT) and compare the proposed method with several baselines. Our method is shown to be more stable without missing communities and more effective than the baselines with competitive performance. The distribution of community size in our method is more in line with the real distribution than those of the baselines at the same time.
Difference synchronization in nonidentical discrete-time chaotic systems with different dimensions using three scaling matrices
Authors: Feng Cun-Fang , Yang Hai-Jun , Zhou Cai 
Published: February 2021

Abstract
In this paper, we consider the difference synchronization for different chaotic maps with different dimensions using three scaling matrices. The proposed method allows us to study difference synchronization of two master discrete-time chaotic systems with dimension

n

and one response discrete-time chaotic system with dimension

m
.

Based on the Lyapunov stability theory and stability property of linear discrete-time systems, controllers are derived to achieve the difference synchronization among three nonidentical discrete-time chaotic systems with different dimensions in two cases:

n
<
m

and

n
>
m
.

For the case

n
<
m
,

2D Fold map and 2D Hénon map are used as the master systems, and the 3D Hitzl-Zele map is chosen as the slave system to simulate the difference synchronization. For the case

n
>
m
,

3D Stefanski map and 3D Baier-Klein map are adopted as the master systems, and 2D Lorenz discrete-time chaotic system is used as the slave system during the simulation. The numerical simulations illustrate the effectiveness and feasibility of the proposed method.
A new approach for modelling the damped Helmholtz oscillator: applications to plasma physics and electronic circuits
Authors: El-Tantawy S A , Salas Alvaro H , Alharthi M R 
Published: February 2021

Abstract
In this paper, a new approach is devoted to find novel analytical and approximate solutions to the damped quadratic nonlinear Helmholtz equation (HE) in terms of the Weiersrtrass elliptic function. The exact solution for undamped HE (integrable case) and approximate/semi-analytical solution to the damped HE (non-integrable case) are given for any arbitrary initial conditions. As a special case, the necessary and sufficient condition for the integrability of the damped HE using an elementary approach is reported. In general, a new ansatz is suggested to find a semi-analytical solution to the non-integrable case in the form of Weierstrass elliptic function. In addition, the relation between the Weierstrass and Jacobian elliptic functions solutions to the integrable case will be derived in details. Also, we will make a comparison between the semi-analytical solution and the approximate numerical solutions via using Runge–Kutta fourth-order method, finite difference method, and homotopy perturbation method for the first-two approximations. Furthermore, the maximum distance errors between the approximate/semi-analytical solution and the approximate numerical solutions will be estimated. As real applications, the obtained solutions will be devoted to describe the characteristics behavior of the oscillations in RLC series circuits and in various plasma models such as electronegative complex plasma model.
A pedagogical review on solvable irrelevant deformations of 2D quantum field theory
Authors: Jiang Yunfeng 
Published: February 2021

Abstract
This is a pedagogical review on

T

T

¯

deformation of two dimensional quantum field theories. It is based on three lectures which the author gave at ITP-CAS in December 2018. This review consists of four parts. The first part is a general introduction to

T

T

¯

deformation. Special emphasises are put on the deformed classical Lagrangian and the exact solvability of the spectrum. The second part focuses on the torus partition sum of the

T

T

¯

/

J

T

¯

deformed conformal field theories and modular invariance/covariance. In the third part, different perspectives of

T

T

¯

deformation are presented, including its relation to random geometry, 2D topological gravity and holography. We summarize more recent developments until January 2021 in the last part.
Possibility of robust detrended fluctuation analysis as a method for identifying fractal properties of geomagnetic time series
Authors: Rifqi F N , Hamid N S A , Yoshikawa A 
Published: February 2021

Abstract
Geomagnetic data has been demonstrated to exhibit fractal properties, which are analysed using various fractal methods. These methods allow the characterization of geomagnetic activity during certain periods using the Hurst exponent. In this study, the geomagnetic activity during the quiet period of the month of December 2011 is analysed using the r-DFA method, of which viability to identify fractal properties of geomagnetic data has not been tested yet, and also using its established predecessor; the detrended fluctuation analysis (DFA). The results show that the r-DFA method is indeed viable to be used upon geomagnetic time series, with comparable if not better performance compared to its predecessor.
An Overview of Log Periodic Dipole Antenna (LPDA) UiTM Site and the Progress Status
Authors: Norsham N A M , Hamidi Z S , Shariff N N M , Husien N , Zainol N H , Sabri S N U 
Published: February 2021

Abstract
The main objective of this paper is focused on the overview of log periodic dipole antenna that was constructed and placed at UiTM and the data obtained from the antenna. The LPDA antenna was combined with the CALLISTO spectrometer where this is a program under the International Space Weather Initiative to support new country to be a part of solar astrophysics group. Until now, there are many locations around the world that grab this opportunity to contribute the data from their country so that all people can be benefited from it. The function of the antenna and CALLISTO system is more to monitor the Sun for 24 hours per day. The monitoring of the Sun is important as the activities from it such as solar flares and Coronal Mass Ejections (CMEs) could harm and disturb the technologies such as GPS and satellites. UiTM take this chance to build the log periodic dipole antenna and the data recorded was presented in this paper. The future improvement of the antenna was discussed to obtain the best performance in gaining the data.
Design of Space-based IoT System on Multiple Access Communication for Nanosatellite Applications
Authors: Rahim S N M , Zaki S B M , Jusoh M H 
Published: February 2021

Abstract
This work is related to the Store and Forward (S&F) technology demonstration mission of UiTMSAT-1 (UiTM’s first nanosatellite). The work aims to develop an array of Ground Sensor Terminal (GST) units to communicate with a single nanosatellite with the S&F application. The terminal unit will uplink Earth based sensor’s data to nanosatellite, hence requires specific equipment to ensure a successful data transmission. A synchronization method based on Time Division Multiple Access (TDMA) is utilised for synchronizing three GST units. The work’s methodology focus is on the situation when all the GST units are within the same nanosatellite’s footprint. In this paper, the design of the system is simulated with different scripted codes and the result is analysed. This work will help to introduce a potential technique for data transfer synchronization between terminals for S&F application of space-based IoT.
Increasing maize yields in Northeast China are more closely associated with changes in crop timing than with climate warming
Authors: Zhang Yi , Zhao Yanxia , Sun Qing 
Published: February 2021

Abstract
An understanding of mechanisms that underlie the steady increase in crop yields over recent decades is important for promotion of future sustainable yield gains and maintenance of future food security. In this study, we coupled observational maize yield and climate variables based on crop development data from 1981 to 2009 to construct an empirical model that can resolve the separate and combined effects of climate and agricultural practices related to crop timing on maize yield in Northeast China (NEC), the largest spring maize-producing region of China. Climate warming contributed to approximately 15.6% of the trend for increasing yield over the 29 year period. The beneficial effects of climate warming on yield were due to increases in accumulation of temperatures between 10 °C and 30 °C (growing degree days, GDD), which positively contributed to 29.7% of yield and offset the −14.1% yield reduction caused by a trend involving increasing accumulation of temperatures above 30 °C (or extreme degree days, EDD). Adaptive improvements in crop timing practices (e.g. shifts in planting date and selection of later-maturity cultivars) further optimized the impacts of GDD and EDD during the entire growing season by exploiting more GDD during the reproductive phase and fewer EDD during the vegetative phase, thereby contributing to a yield gain of 25.4% over the period from 1981 to 2009. Taken together, climate warming and crop timing practices contributed to 39.4% of the maize yield increase since 1981. Yield losses due to climate warming were detected at only one site located in the southern part of the NEC region, where yield losses must be offset by positive effects of crop timing changes. The trends in maize yields presented here may provide guidance for effective adaptation options for maize production under conditions of continued climate warming.
Association between county-level coal-fired power plant pollution and racial disparities in preterm births from 2000 to 2018
Authors: Daouda Misbath , Henneman Lucas , Kioumourtzoglou Marianthi-Anna , Gemmill Alison , Zigler Corwin , Casey Joan A 
Published: February 2021

Abstract
Coal has historically been a primary energy source in the United States (U.S.). The byproducts of coal combustion, such as fine particulate matter (PM2.5), have increasingly been associated with adverse birth outcomes. The goal of this study was to leverage the current progressive transition away from coal in the U.S. to assess whether coal PM2.5 is associated with preterm birth (PTB) rates and whether this association differs by maternal Black/White race/ethnicity. Using a novel dispersion modeling approach, we estimated PM2.5 pollution from coal-fired power plants nationwide at the county-level during the study period (2000–2018). We also obtained county-level PTB rates for non-Hispanic White and non-Hispanic Black mothers. We used a generalized additive mixed model to estimate the relationship between coal PM2.5 and PTB rates, overall and stratified by maternal race. We included a natural spline to allow for non-linearity in the concentration–response curve. We observed a positive non-linear relationship between coal PM2.5 and PTB rate, which plateaued at higher levels of pollution. We also observed differential associations by maternal race; the association was stronger for White women, especially at higher levels of coal PM2.5 (>2.0 μg m−3). Our findings suggest that the transition away from coal may reduce PTB rates in the U.S.
Utilization of Bamboo Fiber towards sustainable asphalt mixture
Authors: Masri K A , Nur Fatin N Y , Chin S C , Nur Syafiqah S M Z , Shaffie E 
Published: February 2021

Abstract
Stone Mastic Asphalt (SMA) is a gap-graded asphalt mixture that depends on the stone-to-stone contact to provide its load-carrying capacity against rutting and stripping. Even though SMA has good performance, especially in resisting permanent deformation, it suffers from excessive binder drain down due to high bitumen content. Thus, the aim of this study is intended to utilize bamboo fiber to control the drainage and bleeding problem. In this study, bamboo fiber is chosen as a modified binder to enhance the performance of stone mastic (SMA 20) due to more economical than other conventional fibers. The aim of this study to evaluate the mechanical performance of bamboo fiber stone mastic asphalt (SMA) in terms of Marshall stability, resilient modulus, dynamic creep, and Cantabro Loss. Twelve samples of SMA 20 mix with PEN 60/70 binders are tested for each test. Bamboo fiber in the range of 0%, 0.2%, 0.3%, 0.4%, 0.5% and 0.6% of on the aggregate weight used in the original mix design. From the results, it shows that the addition of 0.4% fiber contributes to the lowest value of abrasion and dynamic creep and 0.4% producing the highest value for resilient modulus, stability, density, and stiffness. Based on that,0.4 % is the optimum fiber content that could be used to design. Thus, it can be concluded that the existence of fiber is capable of enhancing the performance of SMA 20.
Assessment of Performance Wonogiri Dam in Service of Water Needs Due to The Impact of Erosion and Sedimentation
Authors: Ari Murdhianti A , Sri Wahyu Kusumastuti B , Lily Montarcih C , Pitojo Tri Juwono D , Sisinggih Dian E 
Published: February 2021

Abstract
Wonogiri Dam administratively located in Wonogiri Regency exactly in the upper reaches of Bengawan Solo Watershed. Wonogiri Dam is a multipurpose dam which is used as irrigation, raw water, hydroelectric power plant and flood control. The high impact of erosion and sedimentation became main issue in Wonogiri Dam caused by changes in land use at upstream area. Within 25 years the capacity of Wonogiri Reservoir was reduced by 65 million m3 from 440 million m3 in 1980 to 375 m3 in 2005 as recorded. One of parameter that used for assessment of the dam performance depends on erosion and sedimentation. This study aims to determine assessment of performance Wonogiri Dam in service of water needs due to erosion and sedimentation. Erosion and sedimentation analysis can be determined by using USLE (Universal Soil Loss Equation) and SRD (Sedimen Delivery Ratio) methods. As the result showed that erosion in Wonogiri Watershed has high erosion potential which gain 3,2 million m3/year. The Keduang Sub Watershed shows the highest level of erosion potential, which is between 1.175 million m3/year. The sedimentation rate result in Wonogiri Dam considered relatively high with rate value 1,948,000 m3/year. There for it is necessary that a comprehensive sedimentation management system is needed in the Wonogiri Watershed from both side, in technical and non technical aspect, such as reforestation or dredging activities. Based on the results of the analysis of the impact of erosion and sedimentation, it can be concluded that the performance evaluation of the Wonogiri Dam is include in the sufficient category because many activities have been carried out to restore the reservoir function to its original condition.
Processing of Local Bauxite to Obtain Highly Purified and Fine Alumina Powder
Authors: Ibrahim I , Baharuddin S , Arbain R , Othman A , Joannes C 
Published: February 2021

Abstract
A study on local bauxite was conducted at Mineral Research Centre, Ipoh to produce highly purified fine alumina (Al2O3) powder by using Bayer process as a basis. The study was conducted on a local bauxite from Johor. The raw material being classified having the specific gravity of 2.42 and the major constituent of mineral was identified as gibbsite in which indicates of having 58.7% Al2O3. Moreover, this raw material being classified as high silica content of bauxite ore because of the presence amount of SiO2 was slightly more than 7.0%. Four (4) major processes were performed at Mineral Research Centre such as sample preparation, characterization of raw material, precipitation and characterization of product. In order to produce highly purified and fine alumina, some alternative on leaching and precipitation processes were studied. These due to leaching process tends to pre-determine the rate of recovery and the purity of alumina whereas a very effective precipitation process can be applied to produce fine size of alumina powder. This paper presents some results of leaching and precipitation processes and probably help to show how various processing parameters will affect the effectiveness of alumina recovery, purity as well as its sizes.
Heavy Machinery Operators: Necessary Competencies to Reduce Construction Accidents
Authors: Bedi J K , Rahman R A , Din Z 
Published: February 2021

Abstract
The construction industry has been consistently performing poorly in safety resulting in substantial human and economic losses globally. The hazard related to heavy machinery operations can lead to injury or fatality of operators, workers, or visitors. Thus, safety training of heavy machinery operators (HMOs) is crucial to perform their tasks safely on construction projects. HMOs face various risks due to complex work environments at a job site such as the presence of other workers, material flow, equipment motion, and temporary structures that limit the space for heavy machinery. This research identifies the causes of accidents and competencies required to eliminate these accidents associated with heavy machinery operators. To achieve that, interview data with fifteen construction project managers are analyzed. This study’s findings suggest that the causes of heavy machinery accidents include insufficient maintenance, negligence of operators, inadequate training, human factor, and site condition. Conversely, the competencies to mitigate heavy machinery accidents are knowledge of safety incentives and penalties from safety training, the ability to conduct safety briefing, inspect heavy machinery and site conditions, and communication skills. Industry practitioners and researchers can use these findings to enhance construction productivity by creating a safe working environment at construction sites.
Current Practice in Rehabilitating Old Pipes for Water Distribution Network in Malaysia
Authors: Sufian S S , Romali N S , Rahman R A , Seman M A 
Published: February 2021

Abstract
The water distribution network (WDN) is critical in daily life because it provides treated water to consumers. However, WDN in Malaysia is facing a significant amount of water loss during the water distribution process (i.e., non-revenue water (NRW) with an average percentage of 35.6%. While one of the leading causes of NRW is old pipes, water operators are still facing barriers to rehabilitate old pipes to new pipes. Therefore, this study aims to identify the strategies to improve current practice in rehabilitating old pipes. To achieve that objective, open-ended individual interviews will be performed with sixteen individuals that have experience in managing WDN and NRW in Malaysia. This research contributes to identify the current practice/method, which has three main categories i.e. people, technology, and process in rehabilitating old pipes from industry practitioners’ perspectives, which could assist researchers and industry practitioners in developing strategies to reduce NRW among water operators. The findings of this research can help to improve WDN in reducing NRW.
Model Performance Index of Ground Water Irrigation Systems in the Karst Mountain Region: Case Study in Gunung Kidul Regency, Yogyakarta
Authors: Susilo Hendro , Purwantoro Dwi , Rahadiansyah Shakti 
Published: February 2021

Abstract
Ground Water Irrigation Network (GWIN) make a major contribution to agricultural production in karst mountainous areas, especially in the dry season. A performance index model would be developed to measure the level of success in developing groundwater irrigation systems. Performance evaluation of groundwater irrigation systems was a value called the Groundwater Irrigation Performance Index. This study aims to obtain determinants of the parameters of the index performance of groundwater irrigation that based on technical and non-technical aspects by analyzing the variables that give effect to the both aspects. Technical variables were physical infrastructure, supporting facilities, geological conditions, vegetation conditions, water recharge area conditions, direction of spatial planning, documentation, and crop productivity. Non-technical aspects were personnel organizations, P3A (Association of Water User Farmers’), and economic-socio-cultural. The locus of research was in the Karst Mountains area of Gunung Kidul Regency, Yogyakarta. The method used in collecting data was direct measurement of site visit and secondary data from the field. The non-technical aspects of using questionnaire data as qualitative data were converted into quantitative data. Smart Partial Least Squares was used for filtering variables. GRG-Generalized Reduced Gradient method was used to solve the non-linear equation with the objective-objective assumption and constraints. The model calibration test was calibrated and simulated on the parameters used. The results were a performance index model to measure the level of success in developing groundwater irrigation systems. The performance index evaluation of the developed groundwater irrigation system was an accumulation of technical indexes and non-technical indices involving influential variables.
Towards Better Contractor Performance to Achieve Sustainable Road Project Development
Authors: Shamsuddin Sabri Ir , Ali Mohd Nazri b , Aziz Rohayu Abd , Ismail Ir. Mohd Erie Husairrie b 
Published: February 2021

Abstract
Public Works Department (PWD) is heavily involved in road project management whether the project is conventional in-house, consultant or design and built. Nowadays, PWD has implemented aspects of sustainable road development to improve economic and social development simultaneously with environmental protection. Since 2016 until 2019, 13 road projects in the design stage have been certified Penarafan Hijau (pH JKR). The performance and sustainability of the road project will depend on the performance of the contractor who executes the project. Thus, the appointed contractor must perform well to ensure that the project can be completed within the specified time, cost and quality stipulated and achieve the goals of sustainable road development. To ensure that only the best contractor is chosen, it is important to have a database on the evaluation of a contractor’s performance. This paper proposes the best method to evaluate contractor performance comprehensively. The evaluation encompasses all aspects during construction, including site organisation, administration, planning work progress, work quality, the control of nominated subcontractors or suppliers, and implementing sustainable road development. The assessments were done every six months, and the marks given can be converted into grades to categorise each contractor’s performance. These assessments not only provide the data of contractor performance but will motivate contractors to perform at their peak throughout the project period.