bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of Chloride Ions on Concrete with Geopolymer Coatings in Coastal Area
Authors: Nastiti S F , Ekaputri J J 
Published: June 2020

Abstract
This paper presents the effects of chloride ions on OPC (Ordinary Portland Cement) concrete coated with fly ash-based geopolymer mortar. The coating was applied to protect concrete in coastal areas. The mortar was a mixture of fly ash and alkali activator with a mass ratio of 65:35. The alkali activator was a mixture of Na2SiO3 and NaOH 12M with a mass ratio of 2.5:1. The coating thickness varied at 2.5 cm, 4 cm, and 6 cm. All specimens were exposed to a marine area with seawater curing for 90 days. The mechanical properties of the specimen were determined by compressive strength. Chloride penetration was assessed for durability. A series of tests were carried out after 0, 30, 60, and 90 days of immersion. Compressive strength after a 90-day immersion increased by 34.16%, 39.81% and 31.38% for thickness 2.5 cm, 4 cm, and 6 cm respectively. Compressive strength with a thickness of 4 cm reached 52 MPa, which was the highest strength. The binding capacity of the chloride in geopolymer coatings was more than 80% and could reduce the free chloride content in concrete. Geopolymer mortar coating on OPC concrete showed good results in compressive strength and resistance to chloride attack from sea water. The recommended coating thickness for optimum results suitable for application is 4 cm.
Application of Metaheuristic Algorithms in Truss Structure Sizing Optimization
Authors: Prayogo D. , Harsono K. , Prasetyo K. E. , Wong F. T. , Tjandra D. 
Published: June 2020

Abstract
Field studies of structural optimization have gained increased attention due to the rapid development of metaheuristic algorithms. One widely known metaheuristic algorithm, Particle Swarm Optimization (PSO), has been extensively used to solve many problems and is reported to have fast convergence behavior and good accuracy. As many problems become more complex, studies have been focused on improving PSO searching capability. This study presents the application of PSO and its variants in optimizing truss structures. The performances of PSO and several PSO variants, namely, linearly decreasing inertia weight PSO (LDW-PSO) and bare bones PSO (BB-PSO), were compared and investigated. All optimization algorithms were tested in 72-bar and 25-bar spatial truss problems. The results indicate that BBPSO was the best algorithm in terms of optimum solution, consistency, and convergence behavior.
Reliability-based Design with Size and Shape Optimization of Truss Structure Using Symbiotic Organisms Search
Authors: Prayogo D. , Gaby G. , Wijaya B. H. , Wong F.T. 
Published: June 2020

Abstract
Studies on truss design optimization have been conducted extensively over the past decades. One of the significant current discussions is the reliability aspect of truss design in addition to optimal design. This problem has become more important, especially the sizing and shaping in the optimization of truss structures. Reliability-based design optimization is defined as finding the optimum structure while satisfying the given uncertainty and reliability criteria. This study aims to investigate the performance of metaheuristic algorithm in optimizing the truss structure design and satisfying the reliability constraints. Latin hypercube sampling method was used to model the presence of uncertainty. Symbiotic organisms search was also utilized as a metaheuristic algorithm to solve a modified 15-bar planar truss. The results indicated that reliability design gives a significant result in the shape and size of truss.
Structural Design Optimization Using Particle Swarm Optimization and Its Variants
Authors: Prayogo D. , Sebastian  , Hauwing W. , Wong F.T. , Tjandra D. 
Published: June 2020

Abstract
Structural design optimization has become an extremely challenging and more complex task for most real-world practical applications. A huge number of design variables and complex constraints have contributed to the complexity and nonlinearity of the problems. Mathematical programming and gradient-based search algorithms cannot be used to solve nonlinear problems. Thus, researchers have extensively conducted many experimental studies to address the growing complexity of these problems. Metaheuristic algorithms, which typically use nature as a source inspiration, have been developed over past decades. As one of the widely used algorithms, particle swarm optimization (PSO) has been studied and expanded to deal with many complex problems. Particle swarm optimization and its variants have great accuracy in finding the best solution while maintaining its fast convergence behavior. This study aims to investigate PSO and its variants to solve a set of complex structural optimization problems. Several complex benchmark studies of design problem were provided to study the performance of PSO, linearly decreasing inertia weight PSO and bare bones PSO. The results support the potential use of PSO and its variants as an alternative approach to solving structural design optimization problems.
Mapping of Sea Surface Temperature and its Correlation with Salinity Concentration in The Coastal Beach of Bangkalan Madura District
Authors: Zainab S , Handajani N , Wibisana H 
Published: June 2020

Abstract
Sea surface temperature is one of the parameters that plays a role in the quality of aquatic ecosystems in the sea, especially in shallow marine waters. Other parameters that play a role in determining the quality of the soil on the coast are salinity concentrations, which defines the mineral content of salts that are in the structure of soil widely used for farming or for ponds. This study aims to obtain a correlation of salinity to changes in temporal sea surface temperature for 2 consecutive years on the coastal areas of Bangkalan Madura district as a case study. The method used in this study was mapping with remote sensing using Terra Modis satellite imagery for 2018 and 2019. The acquisition of SST data used the ATBD algorithm and field data while for salinity field data were used. The study found that the magnitude of the SST values during the temporal analysis was not too much different in 2018 and 2019, only for correlations with salinity, the statistically calculated error rate of 5% showed that there were sufficient differences with the SST changes that occured during a year. The conclusion is that there was a significant correlation of the amount of salinity concentration with changes in sea surface temperature that occurred during the year of observation and this requires serious handling so that high salinity in coastal areas do not seep into the land which would have a negative impact on coastal communities.
Groundwater Hydrogeochemistry in Bukit Raya and Tenayan Raya, Pekanbaru, Indonesia
Authors: Rafi F , Karuniasa M , Asseggaf A 
Published: June 2020

Abstract
Pekanbaru is growing rapidly and one of the largest in industry and commercial sector on Sumatera Island. Hydrogeological mapping and major elements in groundwater samples from protected wells were used to determine hydrochemical facies in Bukit Raya and Tenayan Raya sub-districts in Pekanbaru. A total of 14 groundwater samples were collected in May 2017. A Piper Trilinear diagram was employed to evaluate the hydrogeochemical evolution of groundwater. Results show that water table varies from 7.02 to 46.67 m in depth and flow toward the middle of research area which is Sail River. Based on groundwater table, the relationship between groundwater and river water was effluent. Hydrochemical facies of groundwater in the study area are dominated by sodium chloride, calcium chloride, and calcium bicarbonate water type. Dominance of Na+ elements in facies is from the dissolution of Feldspar or Pyroxene in sand, and the Ca2+ element in facies is from the dissolution of Feldspar and Plagioclase in sand. The presence of Cl− element in facies is from salt crystals in rainwater, and the HCO3
− element in facies has contact with air and is dominated by rainwater. Lithology conditions in the study area are generally weathered so that the influence of rocks on rainwater is quite high.
Seismic Site Effect Mapping Based on Natural Frequency Using Microtremor Method in Sidoarjo District
Authors: Widodo A , Rochman J P G N , Perdana A , Syaifuddin F 
Published: June 2020

Abstract
Sidoarjo is one of the satellite districts of Surabaya. The regency has important infrastructures that support Surabaya as a big city, such as the airport, bus terminal, industrial estate and warehouses which are important to support the sustainability of the industries in Surabaya City and East Java Province. With its important role, Sidoarjo Regency faces the risk of disasters in the form of earthquakes caused by earthquake sources in the form of land faults. Faults located closest to the district of Sidoarjo are Blumbang Fault, Pasuruan Fault, Surabaya Fault, and Waru Fault. With this risk, a research is needed to determine the local site effects of land related to seismicity. Therefore, microtremor research was held in Sidoarjo Regency to determine the local site effect in the form of dominant frequency of the soil. Measurements were done in 37 points spread throughout the Sidoarjo Regency. With dominant frequencies mapping, an analysis of earthquake hazard levels were carried out due to geological factors around the Sidoarjo Regency. After measuring natural frequencies, the range of natural frequencies were found to be between 0.8 - 3.65 Hz. Low natural frequency values were found in Waru District and high frequencies were found in Sedati District.
Active Fault Delineation Using Magnetotelluric Data in The Western Region of East Java
Authors: Lestari W , Widodo A , Warnana D D , Syaifuddin F , Rochman J P G N , Zarkasyi A , Setiawan N S 
Published: June 2020

Abstract
The subsurface geological condition of East Java is an area that is crossed by an active fault geological structure. The National Earthquake Center revised the Indonesian Earthquake Hazard and Source Map of 2017 with the discovery of new active faults surrounding the Kendeng Zone, East Java. This research was conducted using Magnetoteluric (MT) method which has high penetration therefore it was able to map the geometry of active deep fault structures beneath the surface. Measurements were made at 11 measuring points focusing on the Blumbang Fault (M6.6) in Lamongan District. 4 (four) lines were made from 11 existing measuring points. The lines were then modelled in 2D to describe the distribution of subsurface resistivity. The results showed an anomaly with low resistivity value which was indicated as Blumbang Fault in 4 section models. Section of line 1 and 2 indicated a fault in the NS-SE direction continuity to the northwest which became deeper to the south from 6 km to 9 km. Lines 3 predicted the fault with low resistivity value (<30 ωm) close to M07 point with a depth of 8 km. However, it did not clearly show its continuity. Line 4 assumed the suspected structure as Blumbang Fault with a resistivity value below 30 ωm that is shallower to the west with 6 km of depth.
Valorisation of waste feathers: treatments and characterization
Authors: Mrajji Ouahiba , El Wazna Mohamed , El Bouari Abdeslam , Cherkaoui Omar 
Published: June 2020

Abstract
Environmental concerns are focused on the search for environmentally friendly, biodegradable, sustainable, renewable and widely available materials. Feather wastes have very special structures and important physiological functions, their valorization offers solutions to these problems. More than 30 million tons of chicken feathers are generated each year by the Moroccan poultry industry. This waste is unfit for valorisation due to the contaminant; debris, skin and blood from the poultry industry. These contaminants should be removed before their valorisation. The aim of this research is to study different treatments (sodium dodecyl sulfate, ethanol, Hydrogen peroxide and Acetone) in order to evaluate their effectiveness in removing the contaminants from the feather’s surface obtained from the slaughter, storage or transport of these poultry wastes. Furthermore, the effects of treatments on the physicochemical and mechanical properties are studied. The results of the treatments showed efficiency at higher concentrations and the best results were attributed to treatment with the sodium dodecyl sulfate with no significant differences in structure and the chemical composition. These results were confirmed with Scanning electron microscopy, infrared spectroscopy (FTIR) and EDX analysis.
Theoretical model of green supply chain management: Support elements
Authors: Elhidaoui Sana , Benhida Khalid 
Published: June 2020

Abstract
Nowadays, works on supply chain management continue to expand, which is associated with the speedy growth of technology on one hand, and the global issue of climate change on the other hand. All these factors have contributed to the emergence of a new field of research, namely the green supply chain management especially in the early 2000s. Through this paper, a brief literature review was conducted in order to summarize the published research work on green supply chain management, followed by a theoretical model that combines a set of tools and practices as support elements for the green supply chain management.
The investigation of crimp and spin-finish effects on the processing behavior of polyaramide fibers during the spinning process
Authors: Boughamoura I , Sinoimeri A 
Published: June 2020

Abstract
The spinning process optimization has been the subject of many articles and publications. They mainly study cohesion and friction forces presented as the most influent mechanical phenomena on fiber workability. However, they were limited to natural fibers studies and more specifically cotton. Therefore, and to enlarge these studies, this article focuses on the processing behavior of fire-resistant fibers of polyaramide type. Besides, inner fiber characteristics have a significant effect on their mechanical behavior. Consequently, the object of this article is to investigate the effect of fiber material and its characteristics, mainly spin-finish and crimp, on mechanical processing behavior, which includes fiber cohesion, and frictional resistance.
New textile-based hybrid photovoltaic/thermal (PV/T) system
Authors: Pause B 
Published: June 2020

Abstract
This paper introduces a new textile-based hybrid PV/T system utilizing a spacer fabric treated with phase change material (PCM). The PCM absorbs excess heat from the PV modules, which keeps the modules in their optimal temperature range so that their power output is enhanced. The thermal energy stored in the PCM is then used for hot water generation. Cold water, which is pumped through thin capillaries integrated into the spacer fabric, absorbs the heat stored in the PCM and is heated up. The warm water can be used immediately or stored in an intermediate storage tank. Comparing the proposed textile-based hybrid PV/T system to conventional hybrid PV/T systems, the proposed system is less expensive and provides a higher overall efficiency. The textile-based collector is lightweight, thin and flexible.
Development of 3D warp interlock fabrics based on moroccan natural fibers
Authors: Samouh Z , Cherkaoui O , Soulat D , Labanieh A R , Boussu F , El moznine R 
Published: June 2020

Abstract
The aim of this research is the valorization of Moroccan natural resources through the manufacturing of innovative 3D interlocks textiles. In order to investigate the potential of the sisal yarns used into 3D warp interlock fabrics, the 3D fabrics were studied at multi-scales (micro-scale, meso-scale and macro-scale). Before starting the manufacture of the 3D fabrics, different physical properties of the sisal fibers were analyzed according to standards. At the meso-scale, the mechanical and thermal properties of the sisal yarns constituting the 3D warp interlock fabric were studied according to standards. After these yarns and fibers characterizations, different types of architecture of the 3D warp interlock fabric have been designed and produced. Some difficulties have been revealed during the weaving process, which highlights the difficulty to handle the sisal yarns in order to obtain 3D fabrics to be used as a future fibrous reinforcement for composite material.
Wastewater treatment using flocculation method and water reuse for dyeing of polyester fibers
Authors: Forte Tavčer P , Prelog K 
Published: June 2020

Abstract
Textile industry uses and pollutes large quantities of water, especially for chemical treatments of textile materials, like bleaching, desizing, dyeing, printing and finishing. After each process, the water is usually drained into the sewage system and fresh water is used for new process of textile treatment. Re-using of wastewater for further processing would be of great importance in term of saving fresh water and diminishing the environmental burden. The goal of our research was to find out whether treatment of dye-house wastewater with flocculation could be efficient enough for water re-use in further dyeing of polyester fabric.
Wastewater collected in Slovenian dye-house was treated with a cationic flocculant. Treated water was analysed for chemical oxygen demand (COD), total organic carbon (TOC), spectral absorption coefficient (SAC) and dry matter and further used for laboratory dyeing of polyester fabric. The fabric was dyed comparatively using technological and treated water under the same conditions in light, medium and dark shade. The colour of dyed samples was evaluated on spectrophotometrically. Wet fastness and colour fastness to perspiration (acid and alkaline) of differently dyed samples were investigated. Change of colour was acceptable for all dyed samples. Fastness to washing and perspiration were good, very similar when comparing samples dyed in technological and those dyed in cleaned water. The colorimetric and fastness results showed a high efficiency of flocculation for dye-house wastewater treatment and reuse of treated water in production.
Mathematical and numerical modelling of soiling effects of photovoltaic solar panels on their electrical performance
Authors: Rouway Marwane , Boulahia Zoubair , Chakhchaoui Nabil , Fouzia Fraija , El Hachemi Omari Lhaj , Cherkaoui Omar , Van Langenhove Lieva 
Published: June 2020

Abstract
With time, the photovoltaic solar panels naturally soiled from dust and other elements. These soils prevent light to reach solar cell and can reduce the long-term profitability. The study demonstrates the soiling effect on the electrical characteristics of panels, productivity and performance. A model simulation was developed in this direction in order to quantify and compare the performance of clean and dirty panels, the dust particles have been considered as spheres with an elliptical shadow on the panel. The results prove a power loss of 40% of a 0,224 mg/cm2 dust deposition in comparison with a clean panel at the maximum operating point MPP. This study describes the identified critical parameters governing the fouling of the PV panels.
Low-pressure gas nitriding of AISI 304 austenitic stainless steel: reducing the precipitation of chromium nitrides
Authors: Xie Wenzhi , Chen Yunxia , Chen Dazhi , Yang Yang , Zhang Chengsong , Cui Guodong , Wang Yixue 
Published: June 2020

Abstract
In this study, low-pressure gas nitriding (gas pressure of 0.01 MPa) was conducted to produce a thicker nitrided layer with high hardness and anti-corrosive properties on AISI 304 austenitic stainless steel. The effects of nitriding temperature and duration on the microstructure and surface property of nitrided layers were systematically evaluated by using optical microscope, X-ray diffraction, elemental analysis, microhardness test and potentiodynamic polarization tests. The samples were also treated under conventional gas pressure of 0.1 MPa for comparison. The results show that the low-pressure gas nitriding could restrain the precipitation of chromium nitrides effectively, which is beneficial for obtaining a thicker nitrided layer. Although the activation energy of nitrogen diffusion for low-pressure nitriding (220 kJ mol−1) is higher than that for the atmospheric pressure nitriding (196 kJ mol−1), the thickness of nitrided layers for low pressure nitriding could reach to a comparable value as that for the conventional atmospheric pressure nitriding. More importantly, the surface toughness and corrosion resistance of nitrided layers could be improved by low-pressure nitriding, which is mainly attributed to the optimized nitrogen content in nitrided layers and the reduced precipitation of chromium nitrides under low-pressure.
Phase-tunable quantum router
Authors: Yan Guo-An , Cheng Wen-Qing , Lu Hua 
Published: June 2020

Abstract
We propose and analyze an efficient scheme for realizing the high transfer rate for quantum router composed of two coupled-resonator waveguides (CRWs) channels coupled with N sequential cavities with embedded N four-level atoms. In this paper, we focus on the effect of the phase difference between different coupling constants which has been ignored in the previous works. In this scheme, we demonstrate that the phase difference between the coupling constants has a very large impact on the band spectra of single-photon propagating from one of the CRW into the other. Besides, as the number of atoms embedded in the two CRWs increases, the efficiency of a single photon being routed into other CRW can reach 100%. More importantly, we also find that if the phase difference of the coupling strength exists, even if there is atomic dissipation in the system, the transfer rate of a single photon not only it not decrease but it increases.
Heart Rate Variability, Sleep Quality, and Depression in the Context of Chronic Stress
Authors: da Estrela Chelsea , McGrath Jennifer , Booij Linda , Gouin Jean-Philippe 
Published: June 2020

Abstract

Background
Disrupted sleep quality is one of the proposed mechanisms through which chronic stress may lead to depression. However, there exist significant individual differences in sleep reactivity, which is the extent to which one experiences sleep disturbances in response to stress.

Purpose
The aim of the current study was to investigate whether low high-frequency heart rate variability (HRV), as a psychophysiological marker of poor emotional and physiological arousal regulation, predicts stress-related sleep disturbances associated with greater risk of depression symptoms.

Methods
Using a chronic caregiving stress model, 125 mothers of adolescents with developmental disorders and 97 mothers of typically developing adolescents had their resting HRV and HRV reactivity recorded and completed a measure of depressive symptoms, as well as a 7 day sleep diary to assess their sleep quality. A moderated mediation model tested whether sleep quality mediated the association between chronic stress exposure and depressive symptoms and whether HRV moderated this mediation.

Results
After controlling for participant age, body mass index, ethnicity, socioeconomic status, and employment status, poor sleep quality mediated the association between chronic stress and depressive symptoms. Resting HRV moderated this indirect effect such that individuals with lower HRV were more likely to report poorer sleep quality in the context of chronic stressor exposure, which, in turn, was related to greater depressive symptoms.

Conclusions
Lower HRV, a potential biomarker of increased sleep reactivity to stress, is associated with greater vulnerability to stress-related sleep disturbances, which, in turn, increases the risk for elevated depressive symptoms in response to chronic stress.