bluuebunny/crossref_metadata_2025 huggingface dataset:
Antibody-mediated clearance of tau in primary mouse microglial cultures requires Fcγ-receptor binding and functional lysosomes
Authors: Andersson Christian Rungsted , Falsig Jeppe , Stavenhagen Jeffrey B. , Christensen Søren , Kartberg Fredrik , Rosenqvist Nina , Finsen Bente , Pedersen Jan Torleif
Published: March 2019

Neurodegenerative diseases such as Alzheimer’s disease are characterized by the progressive spreading and accumulation of hyper-phosphorylated tau protein in the brain. Anti-tau antibodies have been shown to reduce tau pathology in in vivo models and antibody-mediated clearance of tau exerted by microglia has been proposed as a contributing factor. By subjecting primary microglia cultured in vitro to anti-phospho-tau antibodies in complex with pathological tau, we show that microglia internalise and degrade tau in a manner that is dependent on FcγR interaction and functional lysosomes. It has recently been discussed if anti-tau antibody effector-functions are required for induction of tau clearance. Using antibodies with compromised FcγR binding and non-compromised control antibodies we show that antibody effector functions are required for induction of microglial clearance of tau. Understanding the inflammatory consequences of targeting microglia using therapeutic antibodies is important when developing these molecules for clinical use. Using RNA sequencing, we show that treatment with anti-tau antibodies increases transcription of mRNA encoding pro-inflammatory markers, but that the mRNA expression profile of antibody-treated cells differ from the profile of LPS activated microglia. We further demonstrate that microglia activation alone is not sufficient to induce significant tau clearance.
An electron trapping protocol of FePW12O40 microflowers with dual catalytic properties: visible light photodegradation of amphetamine and electrocatalytic oxygen evolution
Authors: Rahut Sibsankar , Basu Soumya Shankar , Basu Jayanta Kumar
Published: March 2019

We have demonstrated the development of a novel polyxometalate compound, FePW12O40, for photocatalytic degradation of amphetamine and electrocatalytic oxygen evolution.
The promotion effect of tungsten on monolith Pt/Ce0.65Zr0.35O2 catalysts for the catalytic oxidation of toluene
Authors: Hou Zhongyan , Zhou Xiaoying , Lin Tao , Chen Yaoqiang , Lai Xiaoxiao , Feng Jie , Sun Mengmeng
Published: March 2019

The temperature for the complete conversion of toluene on the monolith Pt-WO3/Ce0.65Zr0.35O2 catalyst decreases by about 30 °C compared to that on Pt/Ce0.65Zr0.35O2.
Modified acrylamide copolymers based on β-cyclodextrin and twin-tail structures for enhanced oil recovery through host–guest interactions
Authors: Peng Chuan , Gou Shaohua , Wu Qi , Zhou Lihua , Zhang Huichao , Fei Yumei
Published: March 2019

Two kinds of copolymers with host–guest interaction were synthesized, showing great potential for enhanced oil recovery.
Engineering fluorescence intensity and electron concentration of monolayer MoS2 by forming heterostructures with semiconductor dots
Authors: Feng Qiushi , Shi Jia , Yang Weiqiang , Zhong Weiheng , Li Yuanzheng , Chen Heyu , Liu Weizhen , Xu Haiyang , Liu Xinfeng , Liu Yichun
Published: March 2019

Flexibly tunable fluorescence intensity and electron concentration of 1L-MoS2 are achieved by forming novel 2D/0D hybrid heterostructures with semiconductor dots.
Preparation of Ni based mesoporous Al2O3 catalyst with enhanced CO2 methanation performance
Authors: Lin Jianghui , Ma Caiping , Luo Jing , Kong Xianghui , Xu Yanfei , Ma Guangyuan , Wang Jie , Zhang Chenghua , Li Zhengfeng , Ding Mingyue
Published: March 2019

A Ni based mesoporous γ-Al2O3 (MA) catalyst was prepared via partial hydrolysis without organic surfactants and employed in the carbon dioxide methanation reaction.
Enhanced toughness and thermal conductivity for epoxy resin with a core–shell structured polyacrylic modifier and modified boron nitride
Authors: Xu Chen , Qu Taoguang , Zhang Xiaojie , Qu Xiongwei , Wang Nongyue , Zhang Qingxin , Abdel-Magid Beckry , Li Guohua
Published: March 2019

A ternary composite is fabricated with exfoliated boron nitride, core–shell polyacrylic, and epoxy. The mechanical properties and the thermal conductivity were increased synergistically, allowing the composite to be used as the capsulations.
Asymmetric nickel hollow fibres as the catalytic membrane reactor for CO2 hydrogenation into syngas
Authors: Wang Mingming , Tan Xiaoyao , Wang Xiaobin , Meng Bo , Liu Shaomin
Published: March 2019

Herein, we report the development of highly asymmetric Ni hollow fibres with a dense skin layer integrated on a porous substrate by a single-step spinning and sintering technique.
Photostable and highly emissive glassy organic dots exhibiting thermally activated delayed fluorescence
Authors: Tsuchiya Youichi , Ikesue Koudai , Nakanotani Hajime , Adachi Chihaya
Published: March 2019

TADF nanoparticles have been demonstrated as a bright probe for bio-imaging. These nanoparticles show a high PLQY, long lifetime emission and high photostability.
MIL-53(Al) and NH2-MIL-53(Al) modified α-alumina membranes for efficient adsorption of dyes from organic solvents
Authors: Amirilargani Mohammad , Merlet Renaud B. , Hedayati Pegah , Nijmeijer Arian , Winnubst Louis , de Smet Louis C. P. M. , Sudhölter Ernst J. R.
Published: March 2019

MIL-53(Al) and NH2-MIL-53(Al) modified α-alumina membranes are investigated for the adsoption of organic dyes from organic solvents.
Size-controllable and uniform gold bumpy nanocubes for single-particle-level surface-enhanced Raman scattering sensitivity
Authors: Chang Hyejin , Lee Yoon Young , Lee Hye Eun , Ahn Hyo-Yong , Ko Eunbyeol , Nam Ki Tae , Jeong Dae Hong
Published: March 2019

Gold nanocubes modified to form roughened structures with very strong and uniform single-particle surface-enhanced Raman scattering intensity were developed.
Direct electrochemical extraction increases microbial succinic acid production from spent sulphite liquor
Authors: Pateraki Chrysanthi , Andersen Stephen J. , Ladakis Dimitrios , Koutinas Apostolis , Rabaey Korneel
Published: March 2019

The fermentative production of succinic acid leads to increasing toxicity over time, and requires continuous succinic acid removal from the broth to improve fermentation efficiency.
Living (co)polymerization of ethylene and bio-based furfuryl acrylate using dibenzobarrelene derived α-diimine palladium catalysts
Authors: Du Cheng , Zhong Liu , Gao Jie , Zhong Shuhuang , Liao Heng , Gao Haiyang , Wu Qing
Published: March 2019

Living (co)polymerizations of petroleum-based ethylene and bio-based furfuryl acrylate were realized using dibenzobarrelene-derived α-diimine palladium catalysts.
Copper-catalyzed direct C–H phosphorylation of N-imino isoquinolinium ylides with H-phosphonates
Authors: Zhan Xin-Chen , Hei Yu-Yuan , Song Jian-Lan , Qian Peng-Cheng , Zhang Xing-Guo , Deng Chen-Liang
Published: March 2019

A new and efficient method for the synthesis of phosphorus-containing isoquinoline skeletons via copper-catalyzed direct C–H phosphorylation of isoquinoline N-amides with H-phosphonates has been described.
Mechanical generation of isocyanate by mechanically induced retro [2 + 2] cycloaddition of a 1,2-diazetidinone mechanophore
Authors: Lin Yangju , Chang Chia-Chih , Craig Stephen L.
Published: March 2019

Mechanical activation of a 1,2-diazetidinone mechanophore via ultrasonic sonication leads to the formation of isocyanate and imine products.
Enhanced stability and high temperature-tolerance of CO2 foam based on a long-chain viscoelastic surfactant for CO2 foam flooding
Authors: Zhang Panfeng , Ren Shaoran , Shan Yu , Zhang Liang , Liu Yizhe , Huang Lijuan , Pei Shufeng
Published: March 2019

CO2 switchable foams have gained increasing attention recently for their smart properties.
Mathematical modeling and parametrical analysis of the temperature dependency of control drug release from biodegradable nanoparticles
Authors: Lucero-Acuña Armando , Gutiérrez-Valenzuela Cindy Alejandra , Esquivel Reynaldo , Guzmán-Zamudio Roberto
Published: March 2019

Temperature dependence of the main parameters involved in the drug release process from biodegradable nanoparticles.
The emerging role of sorting nexins in cardiovascular diseases
Authors: Yang Jian , Villar Van Anthony M. , Rozyyev Selim , Jose Pedro A. , Zeng Chunyu
Published: March 2019

The sorting nexin (SNX) family consists of a diverse group of cytoplasmic- and membrane-associated phosphoinositide-binding proteins that play pivotal roles in the regulation of protein trafficking. This includes the entire endocytic pathway, such as endocytosis, endosomal sorting, and endosomal signaling. Dysfunctions of SNX pathway are involved in several forms of cardiovascular disease (CVD). Moreover, SNX gene variants are associated with CVDs. In this review, we discuss the current knowledge on SNX-mediated regulatory mechanisms and their roles in the pathogenesis and treatment of CVDs.
Confidence analysis of feature points for visual‐inertial odometry of urban vehicles
Authors: Lee Chang‐Ryeol , Yoon Kuk‐Jin
Published: March 2019

Visual‐inertial odometry (VIO) is the process of estimating ego‐motion using a camera and the inertial measurement unit (IMU). It shows outstanding performance in estimating the ego‐motion of a vehicle at the absolute scale thanks to the gyroscope and the accelerometer. However, VIO has some difficulties in estimating the translation in large‐scale outdoor environments because the feature points along the motion direction and distant feature points in the images can cause degenerate situations. To resolve these difficulties, the authors propose to infer the confidence measures of the feature points and appropriately incorporate them into the Kalman filter‐based VIO. The confidence is computed from the motion direction and the displacements of the tracked feature points under authors’ urban canyon prior. It is applied in situations where the camera is moving forward towards the measurement noise covariance of the Kalman filter for ego‐motion estimation. Experimental results on the public KITTI dataset show that VIO outperforms monocular and stereo‐visual odometries, and the proposed VIO with confidence analysis achieves a translation error of 1.82% and a rotation error of 0.0018 deg/m.
On the use of non‐orthogonal multiple access for V2V message dissemination
Authors: Benabdallah Fairouz , Hamza Abdelkrim , Becherif Mohamed
Published: March 2019

Vehicular networks are characterised by a high density of nodes moving at a high speed and accessing the medium simultaneously which enlarges the interference, decreases the network throughput and spectral efficiency. That increases the challenge of designing a reliable communication scheme to handle the particular characteristics of this network and ensure user fairness. Here, a new vehicle‐to‐vehicle communication scheme is proposed. It consists of using particular vehicles (selected upon their position) to disseminate the message using non‐orthogonal multiple access technique. Power domain NOMA allocates a great amount of power to the vehicle in poor conditions, which enhances the system power control; improve throughput and user fairness in comparison with the OMA‐based IEEE 802.11p standard. A log‐normal shadowing is considered to model the propagation channel. The simulation results show that considering a channel model where severe conditions of signal propagation are present, a more advanced receiver designs have to be proposed on the subject of channel estimation and equalisation to mitigate channel effect on the received data. However, even in a harsh fading environment, NOMA outperforms OMA in terms of network throughput, spectral efficiency, and user fairness, which makes it a very promising solution for future development of vehicular communication systems.
Parameters extraction of photovoltaic sources based on experimental data
Authors: Waly Hussein M. , Azazi Haitham Z. , Osheba Dina S. M. , El‐Sabbe Awad E.
Published: March 2019

This article presents an accurate computational technique for estimating the photovoltaic (PV) cell parameters from experimental measurements of the current‐voltage (I–V) characteristics. The technique is based on using various evolutionary algorithms (EAs) and the double‐diode eight‐parameter cell model to precisely estimate unknown parameters. The proposed technique is implemented to extract the PV cell parameters of different manufacturer's modules by minimising the summation of absolute square errors between theoretical and measured I–V output characteristics obtained under different irradiation levels. The effectiveness and robustness of the proposed technique are demonstrated via a comparative assessment of the measured output I–V characteristics and those obtained by computer simulation, using Matlab SIMSCAPE library components. The good agreement obtained between theoretical and experimental results endorses the proposed approach to determine precisely the PV parameters required for power system studies. The proposed technique is useful power system studies with penetration of photovoltaic sources.
Synthesis of MnO/cotton based carbon composites as lithium‐ion battery anodes: a study on their structures and properties
Authors: Zhao Chenhao , Li Ling
Published: March 2019

The construction of transition metal oxides/carbon composites has been one of the most useful methods to improve the electrochemical performances of transition metal oxides as anodes of lithium‐ion batteries (LIBs). It has been found that various carbon amounts will make a great effect on the structures and properties of composites. In this work, the MnO/cotton based carbon composites are immediately obtained at an inert atmosphere from Mn(NO3)2–cotton mixture, which is readily produced based on the adsorption characteristic of cotton. The influences of carbon contents derived from various cotton amounts on the structures and electrochemical properties of MnO are studied. The results show that decreased crystallinity and improved porous properties can be achieved with increased carbon contents. As LIBs anodes, their electrochemical behaviours are distinct and deeply influenced by carbon contents. The MnO/cotton based carbon composite obtained at a cotton amount of 0.3 g delivers an initial reversible discharge capacity of 812.4 mAh g−1, and a capacity of 775.9 mAh g−1 can be retained after 50 cycles. Meanwhile, the structure–function relation is also discussed in the text.
Parasitic coupled microstrip antenna using shared aperture technique
Authors: Dhiman Jonny , Kumar Khah Sunil
Published: March 2019

Shared aperture based 2 × 2 matrix shaped patch antenna is described here. The 2 × 2 matrix based patch antenna with optimised dimensions is designed from a rotated hollow square shape based patch. Out of four elements, two diagonally placed elements are acting as resonating elements (for L‐band and S‐band separately); rest two acting as parasitic elements. The proposed prototype has a measured impedance bandwidth of 1.54–1.7 GHz in L‐band (S11 <−10 dB) and 3.7–4.2 GHz in S‐band (S22 <−10 dB). Isolation is better than 20 dB in both cases, with reduced cross‐polarisation, due to the presence of the parasitic elements. Details of the proposed prototype and design procedure are given; the experimental results are also discussed along with potential advantages and applications. The proposed antenna is designed and fabricated using FR‐4 substrate (90 mm × 90 mm).
Synthesis and phase transition properties of VO2 (M) hollow spheres with large thermal hysteresis width
Authors: Zhang Yifu
Published: March 2019

Thermochromic VO2 (M) has attracted increasing attention regarding the reduction of its thermal hysteresis width (ΔTc). However, little attention is paid to increase its ΔTc, which may have scientific importance and potential application in the future. Herein, VO2 (M) hollow spheres assembled by nanoparticles are successfully synthesised using NH4VO3 as the vanadium source by a template‐free method. Their diameters mainly range from 350 to 650 nm and thickness of shells is about 50 nm in average. The hydrothermal process plays a crucial role in the successful formation of VO2 (M) hollow spheres. The phase transition temperature (Tc) of VO2 (M) hollow spheres is about 63°C in the heating curve and 32°C in the cooling curve. The ΔTc of VO2 (M) hollow spheres reach as high as 31°C, which is distinctively higher than the reported values (ca. 5–20°C). The huge ΔTc may have potential applications in some fields in the future.
Survival rates of planets in open clusters: the Pleiades, Hyades, and Praesepe clusters
Authors: Fujii M. S. , Hori Y.
Published: March 2019

Context. In clustered environments, stellar encounters can liberate planets from their host stars via close encounters. Although the detection probability of planets suggests that the planet population in open clusters resembles that in the field, only a few dozen planet-hosting stars have been discovered in open clusters.

Aims. We explore the survival rates of planets against stellar encounters in open clusters similar to the Pleiades, Hyades, and Praesepe and embedded clusters.

Methods. We performed a series of N-body simulations of high-density and low-density open clusters, open clusters that grow via mergers of subclusters, and embedded clusters. We semi-analytically calculated the survival rate of planets in star clusters up to ~1 Gyr using relative velocities, masses, and impact parameters of intruding stars.

Results. Less than 1.5% of close-in planets within 1 AU and at most 7% of planets with 1–10 AU are ejected by stellar encounters in clustered environments after the dynamical evolution of star clusters. If a planet population from 0.01–100 AU in an open cluster initially follows the probability distribution function of exoplanets with semi-major axis (ap) between 0.03 and 3 AU in the field discovered by RV surveys (∝ ap−0.6), the PDF of surviving planets beyond ~10 AU in open clusters can be slightly modified to ∝ ap−0.76. The production rate of free-floating planets (FFPs) per star is 0.0096–0.18, where we have assumed that all the stars initially have one giant planet with a mass of 1–13 MJup in a circular orbit. The expected frequency of FFPs is compatible with the upper limit on that of FFPs indicated by recent microlensing surveys. Our survival rates of planets in open clusters suggest that planets within 10 AU around FGKM-type stars are rich in relatively-young (≲10–100 Myr for open clusters and ~1–10 Myr for embedded clusters), less massive open clusters, which are promising targets for planet searches.
Three-dimensional reconstruction of CME-driven shock–streamer interaction from radio and EUV observations: a different take on the diagnostics of coronal magnetic fields
Authors: Mancuso S. , Frassati F. , Bemporad A. , Barghini D.
Published: March 2019

On 2014 October 30, a band-splitted type II radio burst associated with a coronal mass ejection (CME) observed by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamic Observatory (SDO) occurred over the southeast limb of the Sun. The fast expansion in all directions of the plasma front acted as a piston and drove a spherical fast shock ahead of it, whose outward progression was traced by simultaneous images obtained with the Nançay Radioheliograph (NRH). The geometry of the CME/shock event was recovered through 3D modeling, given the absence of concomitant stereoscopic observations, and assuming that the band-splitted type II burst was emitted at the intersection of the shock surface with two adjacent low-Alfvén speed coronal streamers. From the derived spatiotemporal evolution of the standoff distance between shock and CME leading edge, we were finally able to infer the magnetic field strength B in the inner corona. A simple radial profile of the form B(r) = (12.6 ± 2.5)r−4 nicely fits our results, together with previous estimates, in the range r = 1.1−2.0 R⊙.
Finite element analysis of the Circular Double Skin Tubular Concrete (DSTC) under concentric loading
Authors: Piscesa Bambang , Attard Mario M. , Prasetya Dwi , Suprobo Priyo
Published: March 2019

This paper presents a numerical investigation on the behaviour of circular double-skin tubular concrete (DSTC) under concentric loading. The numerical analysis is carried out using a three-dimensional non-linear finite element package (3D-NLFEA). In DSTC specimen, the concrete is enclosed by FRP wraps at the outer tube and circular hollow steel (CHS) at the inner tube. The concrete constitutive model is based on the authors developed plasticity-fracture model which uses a non-constant plastic dilation rate for modelling concrete dilation under compression. The nonlinear buckling analysis is included in the analysis. Random material imperfection is used to induced asymmetric failure pattern. Mohr-Coulomb friction model is used to simulate the contact behaviour between concrete and CHS elements. The results from the FEA are compared with the available experimental results. From the comparison, it can be concluded that the use of the authors plasticity-fracture model is in good agreement with the test results.
Mechanical properties of Indonesian hyperelastic low-grade rubber for low-cost base isolator
Authors: Wijaya Usman , Soegiarso Roesdiman , Tavio
Published: March 2019

Most parts of Indonesia are located at high-risk seismic regions. Therefore, it is necessary to seriously consider earthquake in designing the seismic-resistant buildings. One of the most effective methods to reduce the impact of the earthquake force is to introduce the use of the elastomeric rubber base isolation as an effective earthquake damper. Indonesia as a tropical country has many sources of raw materials particularly rubber. This can be potential as a main basic need for producing an optimum elastomeric rubber base isolation system. This paper determined an approach method of constitutive low-grade rubber to get the best fitting with experimental data. Five deformation models such as Mooney-Rivlin, Ogden, Arruda-Boyce, Neo-Hookean, Yeoh models compare to uniaxial test were adopted to simulate the characteristics of rubber materials used in base isolation. From the analysis, it can be concluded that Yeoh model give the best fitting and the most accurate to the test data even in limited test data.
Properties of concrete using crumb rubber and rice husk ash as additive for rigid pavement material in peat environment
Authors: Abdurrahman Habib , Qoryati Mia , Olivia Muklisin , Olivia Monita
Published: March 2019

A waste tyre is an inorganic rubber waste that is difficult to decompose since it has a complex structure. Utilization of waste tyre as a material to improve elastic properties in rigid pavement construction in peat environment has not investigated yet. The rigid pavement in peat environment needs to be impermeable and posses high elastic properties. This paper presents mechanical properties and porosity of concrete incorporating crumb rubber as an additive in concrete mixture with a variation of 10%, 20%, and 30% by fine aggregates volume. Rice husk ash is added as a filler in various percentage (5%, 10%, and 15%) by cement volume in the mixture. Concrete is produced with a target strength of 35 MPa. In this research, the OPC concrete mix is used as a control mix. Mechanical properties taken were the compressive strength, tensile strength, flexural strength, modulus of elasticity, and porosity at 7, 14 and 28 days. Results show that crumb rubber and rice husk ash addition increases compressive strength, improves elastic properties, i.e., tensile strength, flexural strength, modulus of elasticity, and reduce the porosity of the concrete. It can be concluded that the crumb rubber is potential as an environmentally friendly additive as rigid pavement material in peat environment.
Properties of pervious concrete with various types and sizes of aggregate
Authors: Mulyono Tri , Anisah
Published: March 2019

The benefit of pervious concrete lies in its ability to transport a large volume of water through its pores to the underlying strata, and it often serves as a pavement for vehicles and pedestrians. This research aimed to determine the properties of pervious concrete based on trials in the laboratory. The method used in this research was a laboratory experiment in accordance with the appropriate standards. The local material used in the mixture was a material composition with Portland Cement Composite with a water-cement (W/C) ratio 0.27 to 0.34, with aggregates of various types and sizes and fly ash and superplasticizer as the added ingredients. The mixture for the trial used 4.25 for the aggregatecement ratio (A/C) with a proportion of 6% for the fine aggregate (sand), 15% flay ash and a low dosage of superplastizer. The test results showed a slight difference in compressive strength and split tensile strength alongside variations in the W/C, including the use of different aggregate types and sizes. The permeability when using natural aggregate was more porous compared to the crushed stone. The effect of the aggregate size from small to large will result in decreased density (unit weight) and increased void in the mixture. Good agreement was reached in the 0.30 wcr mixture with an aggregate size that passed through a 12.5 mm sieve, that was retained at 9.5 mm and that provided suitable compressive strength.
An assessment on the parallel impacts of building information modeling and big data on project operation and maintenance
Authors: Shayganmehr Masoud , Saghatforoush Ehsan
Published: March 2019

Operation and maintenance challenges have always been pronounced in construction projects. Many solutions have been proposed to mitigate the common problems but the solution are not sufficient to get over the challenges, therefore, many software-based concepts such as Building Information Modeling have been unveiled to evaluate the construction prior to initiating the project and envision the potential challenges which exist on the way. For higher accuracy IT solutions can be accompanied with Building Information Modeling to leverage the performance and precision of modeling such as Big Data, data mining and even RFID tags, this paper aims to carry out an in-depth literature review on how BIM alongside with Big Data solutions have parallel impacts into higher efficiency and performance of operation and maintenance in construction projects.
Weigh-in-motion at implementation risk sharing on performance-based contract in Indonesia national road
Authors: Teki Tjendani Hanie , Anwar Nadjadji , Artama Wiguna I Putu
Published: March 2019

The Government of Indonesia has implemented an integrated contract, performance-based contract (PBC) to preserve national roads since 2011. Comparing with conventional agreements that prioritize input and maintenance processes, PBC prioritizes the output and outcome of clear and measurable road performance. In the performance-based contracts are required WIM (weigh in motion) tools to monitor the overloading vehicles throughout national roads with PBC and should be provided by the contractor as stated in the contract. However, the installation of WIM tools with the high budget has not been beneficial for the contractor because not followed by punishment for the “overloading” vehicles. PBC is the risk sharing between government as road authority and the contractor as the private sector. So, in PBC practice not allowing any significant losses on either party. This study resulted in a performancebased contract simulator by combining WIM technology and dynamic system methods. If the government succeeds in stopping the overloading vehicle entering the road with PBC contract but the contractor still fails to meet the minimum performance, that is the own risk of the contractor and resulted in the imposition of a fine to the contractor as established in the PBC contract. .
Development of knowledge management in integration management systems in order to increase the organisational performance of construction companies
Authors: Masuin Ringgy , Latief Yusuf , Yuri Zagloel Teuku
Published: March 2019

The previous research on integrated management systems has varied. Most of them used a structural equation model (SEM) or consisted of a literature review. These studies have not yet presented a relationship between integration management systems at the practical level in order to improve organisational performance. These studies have not included knowledge management in their implementation. Research on knowledge management is needed in order to minimise the inefficiency of an organisation. The level of maturity of knowledge management in construction companies is only about 50% (at the practiced level). The biggest obstacle to the realisation of an integrated management system is a lack of knowledge management. Knowledge management is a key standard in integrated management and sustainability reporting. This study aims to identify the most important variables needed in the context of the development of knowledge management and integrated management systems through RII analysis, including developing a job description through RAM RACI R (Responsible), A (Accountable), C (Consult), and I (Inform).
Developing a typology for social infrastructure (Case study: Road side station infrastructure)
Authors: Zetha Rahman Herawati , Andreas Azaria , Perwitasari Dian , Sjafrecia Petroceany Jade
Published: March 2019

At this time, the concept of Social Infrastructure has been studied in Indonesia. One of many types of this kind of infrastructure is called Roadside Station, adopted from Japanese Michinoeki. A roadside station is a place located at the side of the national road in a backbone of Strategic Development Area. This place organizes service functions to road users, economic empowerment of the local community, and part of incubation service for its surrounding area. The concept of the roadside station that will be applied is developing a place for resting around the national road. There will be many public facilities in this roadside station such as a parking place, toilet, restaurant, and retail market. Ideally, this public facilities will be managed by the local community. This research is aim to develop roadside station typologies based on predefined criteria. The first things to do is doing benchmark analysis related to management concept plan for the roadside station. The benchmark is from management concept for the rest area’s highway. The next thing, for each typology, will be defined as the most suitable financial scheme, even it comes from the government fund or from the public-private partnership (PPP). In the end, the research results in determining 3 types of typology for developing roadside station and 3 criteria such as traffic volumes daily, type of zoning according to the location of a roadside station, and type of strategic development area according to the location of the roadside station.
Analysing local motorcyclists’ perception towards road safety
Authors: Priyantha Wedagama Dewa Made , Wishart Darren
Published: March 2019

This study sought to investigate differences in local motorcyclists’ perception towards road safety in Bali. The independent variables consisted of socio-demographic characteristics containing gender, age, marital status, education levels, riding license ownerships, exposure measured by estimates of distance travelled, future riding purposes in the next year, self estimation in riding skill and in being safer motorcyclists, experiences of minor motorcycle crashes, and casualties in the last three years. Two models were developed which consisted of Principal Component Analysis (PCA) and Structural Equation Model (SEM). This study found that sensation seeking significantly influences on attitudes towards risky riding indicating motorcyclists in Bali are more likely to undertake risky riding behaviours on the road as long as they believe there is some degree of control. Interestingly, female motorcyclists involving local residents have low perceptions towards road safety. Further studies on the gender of motorcyclists therefore, are required to provide more information for more target specific and effective road safety campaign.
Warm mix asphalt mixture using modified asbuton semi extraction modify and synthetic zeolite additive
Authors: Sentosa Leo , Bambang S Subagio , Rahman Harmein , Yamin R. Anwar
Published: March 2019

Modifying asphalt aims to improve the performance of the asphalt pavement construction as indicated by increased resistance to permanent deformation and fatigue crack. Asbuton Semi Extraction is one of the materials that can be used for asphalt modification. The addition of Asbuton semi-extraction increases the value of Bitumen Stability Modulus, resistance to permanent deformation and can also increase the asphalt PG value, but require a higher temperature for mixing and compaction. The high temperatures for the manufacture of asphalt mixtures require considerable energy at a more expensive cost and will result in large emissions. The asphalt mixing technology currently being developed is Asphalt Warm Mix, that is asphalt mixture with mixing temperature below 1500°C. One method is to use zeolite additives. The asphalt mixture with the addition of synthetic zeolite can be prepared by mixing and compaction temperatures lower than 30°C of the hot mixture. From the Marshall test, it is known that zeolite addition of 0.3% of the total weight of the mixture gives the characteristic values of the asphalt mixture which still meets the requirements of the specification used. Increased zeolite levels minimize the value of mixed resistance to the immersion indicated by the IRS Marshall value.
Determination of rutting distresses on hot mix asphalts by advanced techniques
Authors: Skronka Gabriel , Jasso Martin , Vacin Otakar
Published: March 2019

The sustainable use of non-renewable natural resources, such as asphalt binder, can be achieved by adequate planning. The proper assessment of asphalt binders is a prerequisite to the appropriate designing of road constructions that can eventually result in pavements in which the development of pavement distresses can be mitigated. Rutting is the most common distress occurring at high temperatures, which is frequently experienced by such countries as Indonesia; thus, the use of adequate asphalt binder in hot mix asphalt pavements results in long-lasting road constructions. By means of advanced techniques, e.g., multiple stress creep recovery test, conducted on a dynamic shear rheometer, it is possible to determine the rutting potential of asphalt binders. This technique, however, still seems to be imprecise at currently determined shear stress values. This paper aims to investigate on the example of ten different asphalt binders, if creep and recovery measured at higher shear stresses result in better correlation with rutting potential of hot mix asphalts than that at the standardized stress levels. Concurrently, other conventional asphalt binder properties (e.g., penetration, softening point, elastic recovery) are determined and compared with rutting.
Improve the Marshall stability of porous asphalt pavement with HDPE addition
Authors: Eka Putri Elsa , Vasilsa Oliensia
Published: March 2019

Porous asphalt is a gap graded pavement that is 20% air voids which enables rainwater that falls on the road surface to flow through the pavement and into drainage on the side of the road. Porous asphalt has a high shear resistance and dries quickly but its stability is low, it is costly to maintain and needs replacing after only a short time. Despite these disadvantages, porous asphalt is still a good choice in area that experiences heavy annual rainfall. High Density Polyethylene (HDPE), an opaque plastic, is harder and stronger than porous asphalt with a tensile strength of 3100-5500 psi. It is resistant to high temperatures. This study aims to investigate the effect of various percentages of HDPE as an additive to produce an HDPE Asphalt Binder for porous asphalt pavement. Marshall parameters were determined based on the AAPA 2004 standard. It was found that 4% HDPE achieved a maximum stability value of 870 kg at the optimum asphalt content for porous asphalt pavement was 5.54%. Stability of porous asphalt pavement with optimum asphalt content value was 61.1% higher after the addition of HDPE. Thus, the use of HDPE as an additive in Asphalt Binder was able to increase the binding strength of the asphalt minimising the disadvantages of the low stability of traditional porous asphalt pavement.
The impact of truck access restriction on toll road traffic performance
Authors: Yusuf Nahry , Helen Yuliana Tambun Grace
Published: March 2019

The freight vehicle access restriction policy in 2011 has had an impact on the performance of the Jakarta Intra Urban Toll way (JIUT) system. Though most of the truck operators are not in favour of this policy, truck restriction has become common strategy to reduce congestion in many cities in the world. The purpose of this study is to analyse the impact of the existence of trucks in the traffic stream on the JIUT system. The analysis will show the impact of access restriction on the toll road performance from a macroscopic point of view, which is represented by the speed - flow - density model. The model will be calibrated by the data of 24-hour observation in a certain segment of JIUT. The model when the trucks are prohibited to use in that condition will be compared to the one when the trucks are allowed to travel. The difference between both models will indicate the impact of the policy. The comparison between both conditions shows a 28.17% better speed performance based on free flow speed and 28.17% higher efficiency at maximum flow rate. This study will benefit the toll operator as well as local transport authority in making decisions on similar policy in order to gain a more optimal advantage of the implementation.
Impact of climate change on rawa river water source in lake Lindu watershed, Central Sulawesi, Indonesia
Authors: Sutapa I Wayan , Galib Ishak Muhammad , Wim Andiese Vera
Published: March 2019

Global Climate change has been discussed in the High-Level Conference in Rio de Janeiro, Brazil in 1992 and has given more impacts in the world. One of the global climate exchanges is the rising of intensity and frequency of climate extreme which included drought, flood, and hurricane. The objective of this study was to investigate the effects of climate change on evapotranspiration and rainfall for river water discharge of Rawa. The investigation has been carried out using daily data and analyzed on a daily, monthly and yearly. The rain stations that represent the location of this research are Palolo, Kulawi, and Wuasa. Climatological station nearest to the research station used Bora. Climate trends and projected changes in the method of Makesens analysis (Mann-Kendall, Sens) and the correlation of rainfall and evapotranspiration discharge used linear regression equation. Similarly, the correlation between changes in soil water storage with rainfall, evapotranspiration, and discharge was analyzed in a linear manner. The conclusion of this study is the climate changes in the River of Rawa watershed was characterized by slowly increasing temperature, increasing rainfall, and decreasing discharge.
Bed configuration under sluice gate at Sandy–Loam Bed Channel
Authors: Rustiati Nina , Dermawan Very
Published: March 2019

Sluice gate operation is necessary to keep the continuity the design discharge. The mis-operation of sluice gate occurs endanger stucture and destruct the bed irrigation channel. Investigation about sluice gate operation and bed configuration are needed to avoid the destruction of the structure bed irrigation channel. The changes in bed form result from interaction of the flow, fluid and bed material. The aim of this paper is to investigate the influence of different flow parameter, height of opening gate and types of bed material. Fourty five runs were executed at different discharge started from 1.0 l/s to 5.0 l/s with an increment of 0.5 where each discharge has five different opening gate to get all characteristics of bed configuration. The material used in the experiments were sandy loam. The experimental were conducted in an acrylic side flume with recirculating water at Applied Hydraulics Laboratory in Water Resources Engineering Faculty, Brawijaya University, Malang, Indonesia. The result of investigation showed that the bed configuration of sandy loam is ripple for most of the condition. At the same opening gate and various discharge the configuration is start by plane bed (no motion) and ripplee. Meanwhile, for the same discharge at the various opening gate occurs the ripple bed configuration. The various velocity that occur during the runing process cause the changing of bed configuration. For the greater discharge at the same opening gate occur the highest velocity. This condition cause the grain sediment material of the bed channel lift up and start to moving. This result is suitable with equation approaches from the van Rijn, Simon Richardson and Garde Albertson.
Use of slag (with cement) for improving the performance of expansive soil of road pavement subgrade
Authors: Ika Putra Agus , Shahin Mohamed A.
Published: March 2019

The study presented in this paper evaluates the suitability of using slag (with cement) as a stabilizer, for improving the performance of expansive subgrade soil in road pavement. Several laboratory tests were conducted to determine the geotechnical engineering characteristics of the expansive soil and associated mechanical engineering performance. The tests conducted include the particle size distribution, standard Proctor compaction, Atterberg’s limits, free swelling, permeability, California bearing ratio (CBR), unconfined compressive strength (UCS), and repeated load triaxial (RLT). In this study, the use of slag (with cement) as a stabilizer followed three proportion schemes, and the selection of a specific stabilizer proportion was determined based on UCS value that satisfies the required standard as a subgrade for road pavement. The results recommended a stabilizer proportion for the soil studied to be 13.5% slag + 1.5% cement at 28 days curing time. This mixture resulted in a remarkable increase in the UCS value of eight times higher than the UCS value of the non-stabilized soil. The CBR value of the mixture was four times higher than the minimum required value for design of road pavement. The study presented herein confirmed that the exploitation of the by-product material of slag can indeed be useful, both in terms of improving the performance of the subgrade soil for road pavement and sparing the environment a spread of significant potential pollutant.
A one-pot synthesis of Fe-doped cryptomelane type octahedral molecular sieve manganese oxide for degradation of methylene blue dye
Authors: Awaluddin Amir , Anggraini Riska , Saidah Siregar Siti , Muhdarina  , Prasetya
Published: March 2019

The Fe-doped octahedral molecular sieve manganese oxides have been successfully synthesized by one-pot synthesis of the reaction between KMnO4 and glucose using sol-gel methods. The oxide products are then characterized by various techniques such as X-ray diffraction, scanning electron microscopy, atomic absorption spectroscopy and average oxidation state (AOS) of manganese in manganese oxides. The as-synthesized manganese oxide and Fe-doped manganese oxides are used as catalysts for the degradation of methylene blue dye using hydrogen peroxide as oxidants. The results indicated that the Fe-doped manganese oxide catalyst displayed much enhanced catalytic activities compared to undoped manganese oxide for methylene blue degradation. The differences in catalytic activities have been correlated with the difference in surface properties and crystallinity.
Modification of natural pumice by physical and chemical treatments for removal of zinc ions from aqueous solution
Authors: Indah Shinta , Helard Denny , Primasari Budhi , Edwin Tivany , Hexa Putra Riyan
Published: March 2019

To increase the adsorption capability of natural pumice from Sungai Pasak, West Sumatra, Indonesia in removal of Zn from aqueous solution, modification by physical and chemical treatments were evaluated. The treatments were heating at temperatures of 300°C, 450°C, and 600°C for physical and soaking in acid solutions (HCl, H2SO4, and HNO3) for chemical treatments. The adsorption was performed in batch system with the optimum condition (6 of pH solution, < 63 um of adsorbent diameter, 3 g/L of adsorbent dose, 5 mg/L of Zn concentration, and 15 min of contact time). The results revealed that the removal efficiency and Zn uptake increase using modified pumice from 68.83% and 1.15 mg/g to 74.46% and 1.24 mg/g. The highest removal efficiency and Zn uptake were obtained from 300°C of heating temperatures and HCl for acid solution. The application of modified adsorbent for removal of Zn from aqueous solution showed that the modification technique has the potential to increase the removal efficiency and metal uptake of the natural pumice.
Economic analysis of the wastewater treatment plant
Authors: Fitriani Heni , Putra Febriansyah , Juliantina Ika
Published: March 2019

Problems in municipal and domestic wastewater have become major issues in sanitation sectors. One of the solutions to overcome domestic sewage is to install the Wastewater Treatment Plant (WWTP). Economic analysis is fundamentally required for its viability. This paper focused on the economic analysis of feasible rates determination based on the ability to pay (ATP) and willingness to pay (WTP) of users. Furthermore, this paper also highlighted the sensitivity of NPV for different scenarios using different discount rates. Field questionnaires were distributed to surrounding communities in the study area. It was found that the values of ATP and WTP were IDR 125,000 and 40,000 respectively. Using the higher values of ATP, the NPV, and BCR were found to be economically feasible. For the sensitivity analysis, the results showed positive NPV using interest rates of 7.75-9.25%, and negative NPV for discount rates up to 9.75%. Therefore, to implement the development of WWTP, subsidies from the local government may help the starting point of the wastewater treatment plans construction and its operation and maintenance costs.
Enhancing lead adsorption in waste lubricant oil with activated clay as bleaching earth
Authors: Kemala Dini , Sarwanto Moersidik Setyo , Adityosulindro Sandyanto , Hilwa Firsta
Published: March 2019

Waste lubricant oil is categorized as hazardous waste that contains several contaminants such as polycyclic aromatic hydrocarbon, chlorinated hydrocarbon, and heavy metals. Among these contaminants, lead has been known as one of the contributive contaminants in used lubricant oil in varied concentrations. To remove this contaminant, adsorption process was carried out by using clay as natural adsorbent (bleaching earth). In order to enhance the adsorption efficiency, the clay was activated by acidification with 1 M, 1.5M, 2 M H2SO4 or calcination in the temperature 300°C, 450°C, 600°C. The activated clay indicated the increase of montmorillonite percentage in clay up to 68% and clay’s surface area up to 67 m2/g from its origin characteristics. The adsorption process showed notable improvement of clay adsorption capacity in removing lead in shorter contact time. The lead removal curve showed that the optimum adsorption condition can be obtained by the use of activated clay with 1.5 M H2SO4 and calcined in temperature 450°C. The optimum adsorption contact time with acid and calcination activated clay was 30 minutes and 180 minutes respectively.
Enhancing BOD5/COD ratio co-substrate tofu wastewater and cow dung during ozone pretreatment
Authors: Andrio David , Asmura Jecky , Yenie Elvi , Putri Khalidazia
Published: March 2019

Ozonation pretreatment was applied to enhancing BOD/COD ratio co-substrate tofu wastewater and cow dung. Ozonation pretreatment were conducted at pH of 5.2,8.0, and 10.0, with contact times of 20, 40, and 60 minutes. The results showed that the best condition for enhancing biodegrability is pH of 10 and contact time of 60 minutes with increasing BOD/COD ratio from 0.06 to 0.49, indicating an easy biodegradable substrate category.