bluuebunny/crossref_metadata_2025 huggingface dataset:
Identité professionnelle et identité religieuse. Solidarités interminoritaires chez de futur·e·s intervenant·e·s du social
Authors: Kolly Maryam
Published: March 2018

A Bruxelles – ville dualisée d’un point de vue socio-économique et au marché scolaire ethno-ségrégé –, une part des jeunesses se caractérise par une hétérogénéité culturelle résultant de trajectoires de migration (d’hier à aujourd’hui), trajectoires qui peuvent être à la source de religiosités affirmées. Sur base d’une vingtaine d’entretiens avec de futur·e·s intervenant·e·s du social, je fais émerger dans ce papier une « parole minoritaire » (i.e. au sens de C. Guillaumin) transversale à des jeunes descendant·e·s de migrant·e·s subsaharien·ne·s et maghrébin·e·s, catholiques et musulman·e·s. Qu’il s’agisse de l’image de la « femme voilée », de la circulation de l’énoncé « Je suis Charlie » ou de la compatibilité croire religieux/travail social, le corpus des interviews fait apparaître des solidarités interminoritaires construites en contre-point des discours hégémoniques intériorisés.
Professionele identiteit en religieuze identiteit. Solidariteit tussen minderheden bij maatschappelijk werkers in spe
Authors: Kolly Maryam
Published: March 2018

In Brussel, een stad met een duidelijke tweedeling op sociaaleconomisch vlak en etnisch gesegregeerd onderwijs, kenmerkt een deel van de jongeren zich door een culturele heterogeniteit als gevolg van migratietrajecten (van verleden tot heden), die ten grondslag kunnen liggen aan uitingen van geloofsovertuiging. Op basis van een twintigtal interviews met maatschappelijk werkers in spe laat ik in dit artikel de transversale “woorden van minderheden” (d.w.z. volgens de betekenis van C. Guillaumin) naar boven komen, meer bepaald van jongeren die (klein)kinderen van Sub-Saharaanse en Maghrebijnse migranten zijn en waarvan een deel moslim en een deel katholiek is. Of het nu gaat om het beeld van de “gesluierde vrouw”, de verspreiding van de slogan “Je suis Charlie” of de verenigbaarheid van geloofsovertuiging en sociaal werk, uit het corpus van interviews komt de solidariteit tussen minderheden naar voren, die in schril contrast staat met het verinnerlijkte hegemonistische discours.
Professional identity and religious identity. Inter-minority solidarity among future social workers
Authors: Kolly Maryam
Published: March 2018

In Brussels – a city subject to duality from a socioeconomic point of view and with ethnic segregation from an educational perspective – a proportion of its youth are characterised by cultural heterogeneity resulting from (past and present) migratory pathways, which may be at the origin of asserted religiousness. Based on approximately twenty interviews with future social workers, I have brought out a cross-cutting “perspective of minorities” (according to C. Guillaumin), of young descendents of sub-Saharan and north African immigrants, both Catholic and Muslim. Whether it is the image of the “veiled woman”, the circulation of the statement “I am Charlie” or the compatibility between religious faith and social work, the corpus of interviews brings out inter-minority solidarity built as a counterpoint to internalised hegemonic rhetoric.
Salt-Responsive AM/AMPS/ATC Terpolymers as Modifiers for Rheology and Fluid Loss in Water-Based Drilling Fluid
Authors: He Yinbo , Jiang Guan Cheng , Cui Wu Ge
Published: March 2018

In this study, we report salt-responsive amphoteric terpolymers prepared by copolymerization of acrylamide (AM), 2-acrylamido-2-methylpropanesulfonate (AMPS) and 3-acrylamidopropyl trimethylammonium chloride (ATC), and their use as rheology and fluid loss modifiers in water-based drilling fluid (WDF). The dependence of viscosity and turbidity on NaCl concentration indicates the salt-responsiveness of terpolymers, which results from salt-induced polymer conformation changes. In the presence of large quantities of NaCl, comparing with BT/polyanioins solution, bentonite (BT)/terpolymer solution has better shear thinning and thixotropic performance as well as lower fluid loss. Morphology shows that BT/terpolymer solution with NaCl creates high-quality filtrate cake which is compact and thin. A salt-resistant WDF prepared with terpolymers is evaluated and compared with polyanioinc WDF and polyanionic sulfonated WDF. The salt-resistant WDF possesses more favorable rheology, lower fluid loss and stronger tolerance for temperature, suggesting the potential use of AM/AMPS/ATC terpolymers as high-performance additives for salt-resistant WDFs.
The Electromechanical Behavior of Dielectric Elastomer Actuator Stiffened by Fiber
Authors: Lyu Long Zhou , Zhu Shijie
Published: March 2018

Dielectric elastomer is functional material that can convert electrical energy to mechanical energy. In this paper, a cylindrical dielectric elastomer actuator was designed and fabricated by using fiber stiffening to improve its electromechanical performance. the effects of pre-straining, rate of applied voltage and fiber stiffening on the electromechanical behavior were investigated by the experiments. It was found that the best applied load for pre-straining was 524g based on the electromechanical tests at the applied voltage rate of 10V/s. The maximum actuated strain decreased with an increase in rate of applied voltage. When the fibers were embedded in the dielectric elastomer actuator, the maximum actuated strain was 27.5%, doubled the value of 14% without fiber stiffening at the applied voltage rate of 20V/s.
Release of Sodium Salicylate from Hydrogels Prepared from Wheat and Arrowroot Starches
Authors: Thitiwongsawet Patcharaporn , Chandratat Choolchinda , Boonnoppornkul Sutee
Published: March 2018

Sodium salicylate (SS), a non-steroidal anti-inflammatory drug, was loaded into starch-based hydrogels and the release characteristics of SS therefrom was studied. The hydrogels were prepared from wheat and arrowroot starches and crosslinked with either glutaraldehyde or sodium tetraborate decahydrate (borax). SS was loaded into hydrogel at concentrations of 10 and 20%w/w based on dry weight of sample. The study of release characteristics was carried out by total immersion method for 24 h in an acetate buffer solution (pH 5.5) at 32°C as the same condition of human skin. A burst release of SS at the initial time followed by a gradual release to reach a plateau was observed. The maximum amounts of SS released from the hydrogels were about 8-22 mg. The amount of water retention of hydrogels was also determined at the same condition with that of the study of release. The hydrogels with the greater amount of water retention showed the higher release of SS. The hydrogels crosslinked with borax had higher amounts of SS released than those crosslinked with glutaraldehyde. The hydrogels containing 20% SS-loaded showed higher amounts of SS released than those containing 10% SS-loaded. The hydrogels prepared from arrowroot starch showed higher amounts of SS released than those prepared from wheat starch. From the study of release kinetics based on the Korsmeyer-Peppas model, the exponents of release (n) of all specimens were close to 1 which indicated Case II diffusion.
Experimental Investigation on Aerosol-Particle Sustaining Characteristics of a Porous-Walled Tube
Authors: Kim Kyung Won , Boeur Brandon Y. , Hyun Sin Jae , Park Cheol Woo
Published: March 2018

In the present study, we experimentally investigated the aerosol-particle sustaining features of a porous-walled rubber foam tube model according to outlet humidity and temperature variations. An oleic acid aerosol is used as the inlet working fluid and the embedded particle diameters are in the range of 6–10 μm. To analyze particle size distribution, a wide-ranging particle spectrometer is employed, and particle sizes are measured at the inlet and outlet of the tube. Variance analysis is performed to evaluate the significance level of various tube-wall conditions, including dry and moist aerosol conditions at room and body temperatures. For the cases of larger particle sizes, the sustaining rates are increased when the porous wall condition is moist and at body temperature.
Fabrication of Mesoporous Bioactive Glass Nanoparticles by Sol-Gel Method
Authors: Lin Wei Wen , Fang Wei , Chen I Hao , Hung Tze Yo , Huang Chih Ling
Published: March 2018

Bioactive glass (BG) is characteristic of its great biocompatibility as well as osteoconductivity. Application of BG after surgery (e.g., tumor resection) aids rehabilitation of previously traumatized area, promotes bone regeneration, and prevents aggravation of wounds. In this in vitro study, bioglass nanoparticles (BGN) were successfully produced via sol-gel method. We observed the morphology of BGN through Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). Particle size was measured by Dynamic Light Scattering (DLS): 182.9 nm ± 37.7 nm in diameter, which corresponds to images obtained by SEM and TEM. We then synthesized BGs containing different proportions of Ca and P ions. Under different pH values, gels with various morphologies were formed.
Investigation of Microclimate in Sports Shoes with the Integration of Human Subjective Sensations
Authors: Yu Annie , Li Pui Ling , Yick Kit Lun , Ng Sun Pui , Yip Joan Ne
Published: March 2018

Thermal comfort is an important criterion for the overall wear comfort of shoes. In this study, the materials properties, the microclimate of two types of sport shoes made of leather and mesh spacer fabric were evaluated. The human subjective sensations when wearing the shoes were investigated. Ten youth and ten elderly subjects have taken part in wear trials that consist of three activities: sitting, walking and running, while wearing the two types of shoes and in the barefoot condition. The order of the wear trials is randomized for each subject. The temperature and humidity at six locations of the foot were recorded during the wear trials and subjective perceptions of thermal, humidity and comfort were rated at the end of each wear trial. The results show that the leather sports shoes trap more heat and moisture on the feet than the mesh fabric sports shoes. The effect is more significant during running. Therefore, the shoe upper materials not only affect the temperature and humidity of the foot dorsal but also those of the foot plantar. Gender, foot condition and type of activity have a significant linear relationship with thermal, humidity and comfort perceptions towards footwear. Age does not have any impact on the three subjective perceptions. The findings in this study can therefore act as a reference source for the design and development of footwear that have better wear comfort.
Microstructure and Mechanical Properties of Equitomic CoCrFeCuNi High Entropy Alloy
Authors: Oh Seung Min , Hong Sun Ig
Published: March 2018

Microstructure and mechanical properties of cast and cold-rolled equitomic CoCrFeCuNi alloy in which Mn was substituted by Cu from Cantor alloy was studied. The separation into two solid solutions (Cr-Co-Fe rich and Cu-rich phases) were observed in CoCrFeCuNi. Coarsening and widening of interdendritic Cu-rich phase after homogenization was observed after homogenization, suggesting Cu-rich phase is thermodynamically stable. The compressive stress-strain curves of homogenized cast CoCrFeCuNi alloy exhibited the reasonably high strength and excellent deformability for the cast alloy. The yield strength increased up to 960MPa after cold rolling from 265MPa of the homogenized cast alloy. The significant increase of yield strength is thought to be associated with the alignment of Cu-rich second phase in addition to cold work dislocation storage after cold rolling.
Molecular Vibration Theoretical Analysis of Two-Dimensional Photoelectric Conversion Material WSe2
Authors: Zhang Rui , Li Hong Bo , Hao Guo Qiang , Liu Wen Bo , Ye Xiao Jun , Li Zheng Hong , Yuan Xiao , Liu Cui
Published: March 2018

Monolayer WSe2 is flexible, nearly transparent and direct band-gap semiconductor with the potential to be new generation thin film photoelectric conversion materials. The molecule vibration modes of monolayer and bulk WSe2 was analyzed by factor group and the phonons dispersion and vibration frequency was calculated by first-principles based on density functional theory. Furthermore, the comparison between the above calculations and experiment values of Raman shift of monolayer and bulk WSe2 was made to verify the accuracy of theoretical analysis and theoretically explain the differences of monolayer and bulk WSe2 materials in Raman spectra.
Micromechanical Study of the Forged Ti-1023 Titanium Alloy by Micro-Indentation
Authors: Li Jiang , Li Fu Guo , Ma Xin Kai , Zhang Ming Jie , Yuan Zhan Wei
Published: March 2018

In order to study the micromechanical behaviour of the forged Ti-1023 titanium alloy, micro-indentation experiments of the forged Ti-1023 titanium alloy were performed with various maximum indentation loads from 500 mN to 4000 mN and various loading speeds from 5.06 mN/s to 51.85 mN/s. Using the experimental data, the non-destructive instrumental approach was applied to indicate the mechanical properties just like the Young’s modulus E, microhardness H, initial yield stress σy and strain hardening exponent n using the P-h curves from the tests. The result showed that the value of the indentation Young’s modulus basically remain unchanged in the range from 110 GPa to 150 GPa and H decreased with the increase of the load, the micro-indentaion plasticity constitutive equations were obtained by using Hookean elastic and power-law plastic stress-strain equations.
Hot Ductility of Cast High Nitrogen Fe-Cr-Mn-Ni Steel
Authors: Lee Byung Ju , Hong Sun Ig
Published: March 2018

Hot deformability and fracture of as-cast Fe-Cr-Mn-Ni stainless steel ingots with high nitrogen and high carbon contents were studied. Effective stress-strain curve indicates a decrease of the UTS from 510MPa to 90MPa with increase of temperatures from 600°C to 1200°C. Effective stress-strain curves exhibited typical work hardening until the final stage of fracture from 600°C up to 900°C. The fracture elongation decreased from 600°C with the increase of temperature up 850°C, but started to increase appreciably as the work softening becomes dominant in the stress-strain curves above 950°C, suggesting the increase of ductility above 950°C is associated with dynamic recrystallization. The high temperature deformability was enhanced above 1000°C by homogenization of the as-cast alloy due to the dissolution and redistribution of segregated particles, providing the homogeneous distribution of the nucleation site of dynamic recrystallization. . The presence of fatal crack at 1,250°C and the loss of hot ductility can be attributed to the partial melting in austenite grain boundaries at high temperatures.
CVD Technology for Preparing Chromium Oxide Coatings, Study of the Kinetics of Growth of Coatings
Authors: Tabaza Taha A. , Tabaza Omar T. , Al-Sakarneh Amjad
Published: March 2018

Metal coating nowadays is very essential in heavy industry and many other applications, however, a coating system is designed and built to obtain pyrolytic Chrome-Oxide Cr2O3, so oxygen is distributed through the coating in order to enhance its properties depending on metal-organic compounds (MOC). A very large number of experiments have been performed to study the effect of oxidant comparing with inert atmosphere. A chemical vapor deposition method for preparing chromium oxide Cr2O3 coatings from bis-arene chromium compounds has been performed, followed by studying the effect of oxidant substances concentration on the kinetics of growth of coatings. The main finding is that coatings exhibit excellent adhesion, high microhardness, and wear resistance. The coating process is characterized by high adaptability and relatively low cost.
Influence of Process Parameters of 316LN Hot Wire Filling Laser Welding on the Blunt Edge Layer Forming Quality
Authors: Xu Kai , Zhang Shu Quan
Published: March 2018

Laser welding with hot wire addition is a new type of welding method. In order to search for appropriate laser welding technological parameters, main technological parameters have ran orthogonal optimization tests, root face layers have ran orthogonal experiments, impacts on root face forming qualities of technological parameters have been analyzed. Experimental results show that, the most influential technological parameter of weld width is welding speed, by lowering welding speed heat heat input in per unit of time will be increased, weld width decreases with the increase of defocusing amount and decrease of density of power.
Withdrawal Resistance and Failure Mode of Semi-Circular Wooden Composite with Different Fasteners
Authors: Lin Hsiu Ting , Tsai Meng Ting , Sugiharto Wonodihardjo Anthony
Published: March 2018

Wooden Composite is assembled with semi-circular waste wood by fastener, in order to provide local Indonesian affordable construction components potentially. Considering wooden composite, the withdrawal resistance affect the shear resistance ability under short-term lateral load, therefore withdrawal test is carried out in this study. The withdrawal test shows that steel nail and self-tapping screw work properly to attach each specimen when considering the assembly of wood composite. The observation results indicate different types of fasteners affect the test result significantly. For the fasteners connected with hardwood, the test result shows higher withdrawal resistance than softwood, both using self-tapping screw and steel nail. Based on the test results, there are 3 main failure modes that is concluded, which are fastener failure, material failure, and conditional failure. The test result of self–tapping screw also shows that this kind of fastener is able to withstand 3.5 times stronger than steel nail.
Lead Free Bi1/2Na1/2TiO3-CoFe2O4 Magnetoelectric Nanoparticulate Composite Thin Films Prepared by Chemical Solution Deposition Method
Authors: Kumar Vinod , Tyagi Mintu
Published: March 2018

Magnetoelectric (1−x) BNT−x CFO nanoparticulate thin films with (x = 0, 0.1, 0.2, 0.3) were fabricated by a chemical solution deposition technique. The X-ray diffraction shows that no other secondary phases are observed. Transmission electron microscope (TEM) revels that CFO nanoparticles were well distributed in matrix of BNT. The nanocomposite films exhibit both good magnetic and ferroelectric properties at room temperature (R-T), as well as enhanced magnetoelectric coupling. The composite with x = 0.2, showed the large value of ME voltage coefficient (αE ) ~ 163 mV/cmOe. These ME composites provide a great opportunity as potential lead free systems for ME devices.
Fabrication of Lightweight Concrete Composites Using Natural Fibers in Thailand
Authors: Sooksaen Pat , Boodpha Vimon , Janrawang Porntipa , Songkasupa Peemmawat
Published: March 2018

This study developed lightweight concretes by using three different natural fibers from agricultural industries in Thailand which were corn husk fiber, bagasse fiber and coconut husk fiber. Low cost lightweight concretes in this study were fabricated using Ordinary Portland Cement type-1, coal fly ash, un-treated natural fibers and NaOH-treated natural fibers. The specimens were tested for bulk density, compressive strength, microstructure and deterioration. The result showed that the strongest concrete composite was obtained using 30 vol% fine coconut husk fiber in the concrete composition. The treated fibers showed an improvement in surface adhesion between cement matrix and fibers which resulted in higher compressive strength value.
Influence of Physicochemical Properties of Sugarcane Bagasse Ash (SCBA) in Portland Cement Hydration
Authors: Santos Tiago Assunção , Andrade Neto José , Santos Vitor Souza , Ribeiro Daniel Véras
Published: March 2018

Due to the concern with the environmental impacts caused by the gases emitted by the cement industry and by the inadequate disposal of wastes generated in the sugar-alcohol industry, such as sugarcane bagasse ash (SCBA), a search for the development of new technologies, which are less aggressive to the environment and that propose feasible alternatives, began in order to reuse these wastes properly. Among these alternatives is the reuse of SCBA as partial replacement to cement or as addition to cementitious matrices. In this way, the present research has the objective of analyzing the influence of SCBA obtained by the calcination of sugarcane bagasse (SCB), at 600°C, in the process of Portland cement hydration. Initially, the SCBA was characterized physically, chemically and mineralogically, and then cement pastes with 20% and 35% substitution contents were elaborated, besides the reference paste, which were analyzed through X-ray diffraction (XRD) and thermogravimetric (TG) techniques. The results obtained show that there is a consumption of portlandite as a consequence of the use of SCBA, evidencing the pozolanicity of these ashes. In the pastes with 35% substitution content, there was an intense consumption of the portlandite, indicating, in this proportion, the pozzolanic reaction was more intense.
Investigation of Gamma Radiation Shielding of Concrete Containing Blast Furnace Slag Waste via Experimental and Calculation Methods
Authors: Phutthanet Pranpriya , Tiantong Pithiwat , Julphunthong Phongthorn , Joyklad Panuwat , Wang Li Jie , Chindaprasirt Prinya
Published: March 2018

This study aims to evaluate gamma-ray shielding characteristics of concrete produced from blast furnace slag. The chemical and physical properties of the aggregates including the chemical composition and specific gravity were investigated to evaluate their radiation shielding properties. The samples were prepared with a cement content of 400 kg/m3, a water to cement ratio of 0.4, and fine aggregate of 43% and coarse aggregate ratio of 57%. Blast furnace slag was replaced with sand at 25%, 50%, 75% and 100% by volume to improve the shielding properties. The compressive strengths at 3, 7 and 28 days and the unit weight of the prepared samples were determined. The linear attenuation coefficient was measured and calculated at photon energies of 0.662 MeV, 1.17 MeV and 1.33 MeV. The WinXCom program was employed to calculate the attenuation coefficient from the chemical composition of samples and the results were compared to the measured results. The study results suggest that the use of blast furnace slag is effectively in improving the compressive strength and shielding properties of concrete. The increase of blast furnace slag caused an increase in the linear attenuation from 0.190 cm-1 to 0.210 cm-1 at 0.662 MeV.
Improving the Tensile Energy Absorption of High Strength Natural Fiber Reinforced Concrete with Fly-Ash for Bridge Girders
Authors: Khan Umair Aziz , Jahanzaib Hafiz Muhammad , Khan Mehran , Ali Majid
Published: March 2018

Nowadays high strength concrete is used in bridge girders due to its improved mechanical properties. However, its behavior is relatively more brittle compared to that of normal strength concrete. Due to the highest toughness among natural fibers, coconut fibers are chosen. In this work, the impact of different fly-ash contents on tensile absorbed energy of high strength coconut fiber reinforced concrete (CFRC-SF) will be investigated for structural application. The mix design ratio of CFRC-SF is 1:2:2 (cement: sand: aggregate) with a water-cement ratio of 0.50 and silica-fume content of 15%. The coconut fibers of 5 cm length and content of 2%, by cement mass, are added. To prepare CFRC-SF5, CFRC-SF10 and CFRC-SF15, different fly-ash contents of 5%, 10% and 15%, respectively, (by cement mass) are added. For determination of splitting-tensile strength, pre-crack/ absorbed energy after crack and toughness indices, cylinders of size 100 mm diameter and 200 mm height are cast and are tested under splitting-tensile load as per ASTM standard. The tensile absorbed energy of CFRC-SF is increased up to 10% fly-ash content. Further study on durability of CFRC-SF is suggested due to the biological nature of coconut fibers.
Contribution of Sisal Reinforced Plaster in out of Plane Resistance of Masonry Column
Authors: Qamar Furqan , Thomas Terence , Ali Majid
Published: March 2018

Now a days to ensure sustainability low carbon emission environment friendly products are considered widely around the world. In the construction field, artificial fibres has been researched and used since long time. They are detrimental to the environment due to being non-degradable, non-renewable and high oil consumption. Therefore, there are thoughts to replace them with the natural fibres. In this paper, sisal fibre is considered and are used within 8 mm thick plaster of masonry column. In order to gauge the contribution of sisal fibre within plaster, comparison with unplastered and plain plastered columns are carried out. Two samples of each are considered. The outcome of the experiment revealed that the 8mm thick sisal reinforced plaster column was more ductile and it can be found 1200% and 27% improvement in failure load from unplastered and plain plastered column, respectively, when subjected to out of plane lateral load.
Application of Redundancy to Steel Box Tied Arch Bridge Structural System
Authors: Zheng Xiao Bo , Fu Chung C. , He Shuan Hai , Hu Da Lin
Published: March 2018

Bridge redundancy is defined as the ability of a bridge system to continue to carry load after the failure of one or several structural components. A bridge will collapse progressively after the failure in some main components, if the bridge is in short of redundancy. The system factors for redundancy have been investigated in the design of the bridges with simple systems. However, there is no corresponding redundancy criteria established for the bridges with long span and complicated structural systems. This paper studied the superstructure of a through steel box tied arch bridge. The member failure state, ultimate limit state and functionality limit state were analyzed with ‘Step-by-Step’ procedure. Thus, the most critical component and weakest damaged systems are determined. It is concluded that this through steel box tied arch bridge has enough level of redundancy. This finding could be a reference for the design and maintenance for bridges with similar structural systems.
Seismic Fragility Assessment of Building with Metallic Hysteretic Damper in Consideration of Stiffness Ratio
Authors: Teruna Daniel Rumbi , Wijaya Hendrik
Published: March 2018

The application of hysteretic steel damper for seismic protection and rehabilitation has been recognized efficient and cost effective method in reducing structural responses under seismic events. The damper absorbs seismic energy through its hysteretic behaviour. This study aims to assess the vulnerability of building strengthened with hysteretic steel damper considering variability of stiffness ratio parameter in hysteretic steel damper for the application in six-story steel building. Probabilistic Seismic Demand Model (PSDM) for the structural model is developed by using nonlinear dynamic analysis under 30 ground motions. Furthermore, fragility curves are constructed based on inter-story drift and spectrum acceleration. Finally, the performance of the steel structure with and without hysteretic steel damper in addition to optimal stiffness ratio is presented and compared.
Examining the Effect of Asphalt Plant Surplus Filler on Water and Chloride Ion Permeability of Cement Mortar
Authors: Vafaeinejad Hadi , Kioumarsi Mahdi
Published: March 2018

The penetration of water and chloride ion into the concrete is of factors that cause rust and corrosion in rebars by reaching the existing reinforcement surface in reinforced concrete structures. In this study, effect of using Asphalt Plant Surplus Filler as a partial replacement of cement with replacement values of 0, 5, 10, 15 and 20% on permeability and electrical resistance of cement mortar were investigated with the aim of decreasing cement consumption. In order to determine the penetration of water, 10 cubic specimens with the size of 150 mm were made and tested. In order to determine chloride ion penetration, 20 cylindrical specimens with a length of 50 and a diameter of 100 mm were studied at the ages of 28 and 56 days. To test the electrical resistivity of cement mortar, 30 cubic specimens with the size of 100 mm were tested at the ages of 7, 28 and 56 days. According to the results of the experiments, adding filler to the cement mortar enhances the penetration of water and chloride ion. Electrical resistivity generally increases with the increase of specimen age. Furthermore, the filler increment indicates the reduction of electrical resistivity.
Effects of Gold Nanoparticles on Fluorescence Polarization and Emission Spectra of Rhodamine 6G Solution
Authors: Damrongsak Pattareeya , Rammarat Ekkachai , Locharoenrat Kitsakorn
Published: March 2018

Fluorescence polarization and emission spectra of Rhodamine 6G solution with gold nanoparticles have been studied. It is found that the emission intensities tend to be low when the gold nanoparticles are added into the solution partly due to the energy transfer from the Rhodamine 6G to gold nanoparticles. The fluorescence polarization increases as the concentration ratio of the gold and Rhodamine 6G is more than 124 and decreases as the ratio is about 1115. The enhancement and reduction of fluorescence polarization values are understood as the shortening of the fluorescence lifetime and a temperature effect from the heating of gold nanoparticles, respectively.
Pushover Analysis of Precast Segmental UHPFRC Bridge Columns with Unbonded Posttensioned Tendons
Authors: Wang Zhen , Wang Jing Quan , Zhu Jun Zheng
Published: March 2018

Cyclic loading tests were carried out to research seismic behavior of precast segmental ultrahigh-performance fiber-reinforced concrete (UHPFRC) bridge column with unbonded posttensioned (PT) tendons. Energy dissipation (ED) bars embeded in ultrahigh-performance concrete (UHPC) grout maintained continuous across segment joints and unbonded at the bottom joint. The equivalent method was proposed for ED bars with unbonded length and unbonded PT tendons to obtain the equivalent fiber section conforming to the flat section assumption. A method based on the equivalent plastic hinge model was given to conduct pushover analysis for precast segmental UHPFRC bridge columns. Test results showed that all the specimens exhibited no less than 8% drift capacities, which were remarked with the first fracture of ED bars. Compared with test data, the proposed model was validated to have good accuracy to provide lateral skeleton curve.
Preliminary Study of Sinabung Volcanic Ash Usage in the Making of Paving Block Type C and D
Authors: Karolina Rahmi , Syahrizal Syahrizal , Putra M. Agung , Nurdiansyah Bambang
Published: March 2018

Based on the Volcanology and Geological Hazard Mitigation Center, Mount Sinabung itself is still at hazardous status up until now that can certainly erupt at any time and sprayed a lot of volcanic material which will lead to the abundance of volcanic ash material in the area of Mount Sinabung. How to optimize the volcanic ash waste is what scientists need to think about. In this study, volcanic ash obtained from Mount Sinabung is used as substitution of fine aggregate in the manufacture of concrete brick (paving block). The variations used were 0%, 25%, 50%, and 75% of the starting weight of the fine aggregate used. From the test results, it is obtained optimum compressive strength of 25.2 Mpa and optimum water absorption of 5.998% which means concrete brick (paving block) meets the classification contained in SNI 03-0691-1996.
Controlling the Absorption of Gold Nanoparticles via Green Synthesis Using Sargassum crassifolium Extract
Authors: Maceda Angeline F. , Ouano Johnny Jim S. , Que Mar Christian O. , Basilia Blessie A. , Potestas Melchor J. , Alguno Arnold C.
Published: March 2018

This work controls the absorption of gold nanoparticles (GNPs) via green synthesis utilizing Sargassumcrassifolium extract. The amount of seaweed extract acts as both reducing (from Au+ to Au0) and capping agent. The S.crassifolium extract is mainly composed of biomolecules such as protein and phenolic compounds which are responsible for the synthesis of GNPs. The synthesized GNPs were characterized using UV-Visible spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy and Transmission Electron Microscopy (TEM). UV-Vis spectra revealed peaks around 505 nm to 544 nm which corresponds to the Surface Plasmon Resonance (SPR) of GNPs. FTIR spectroscopy analysis showed peak at 825 cm-1 and 1144 cm-1 which corresponds to the signature peaks of GNPs. Polydisperse GNPs with varied sizes (between 5 nm to 300 nm) were further confirmed by TEM analysis.
Effects of GnF Concentration on the Mechanoelectrical Properties and Surface Morphology of GnF/PDMS Composites
Authors: Choi Young , Park Sang Hyun , Park Sung Min , Nam Gyung Mok , Woo Seung Pyo , Park Sang Heon , Uhm Won Young , Yoon Sang Hee
Published: March 2018

The graphite nanoflake (GnF)-reinforced polydimethylsiloxane (PDMS) composites (GnF/PDMS composites) are developed as new polymer matrix composites (PMCs) with controllable mechanoelectrical properties. Here, we investigate the effect of GnF concentration on the mechanoelectrical properties (i.e., elastic modulus, fracture strain, and conductivity) of GnF/PDMS composites; the change in the surface morphology of GnF/PDMS composites caused by a variation in GnF concentration is also explored. The mechanoelectrical properties are measured by performing tensile tests on the GnF/PDMS composite specimens with different GnF concentrations of 5.0, 10.0, 12.5, 15.0, 20.0, and 25.0 wt.%. The surface morphology is analyzed in terms of internal void formation and surface roughness. The elastic modulus is measured to be in the range of 1.62 to 13.8 MPa which is proportional to GnF concentration, while the fracture strain and electrical conductivity are respectively characterized to be in ranges of 0.09 to 2.09 and 0.3 to 221.0 S/m which are in inverse proportion to GnF concentration. An increase in GnF concentration leads to increases in internal voids’ amount and surface roughness. The GnF/PDMS composites can be used as sensing materials for detecting both small and large deformations in a variety of engineering applications.
Utilization of Tobacco Raw Material into Biofuel
Authors: Ahmad Abubakar , Azkya Zahra Syifadeasy , Fauzi Moehammad
Published: March 2018

As the fifth largest tobacco market in the world, most of the tobacco raw material in Indonesia is utilized for cigarette production. People still unfamiliar with the notion of utilizing tobacco leaves for another purpose. This paper will try to propose a new way to derive benefit from tobacco leaves into biofuel. The method will be done through literature review. The study was focused on 3 things, mainly the potency of tobacco leaves in Indonesia, obtaining and handling raw material and potential market of biodiesel itself. This research resulted that currently, tobacco need to develop in Indonesia because Indonesia is a potential country in the development of biodiesel, especially biodiesel made from tobacco. We also concluded that biodiesel from tobacco has an advantage in terms of increased productivity of oil and biodiesel from tobacco mixed by ordinary diesel can produce lower combustion emissions and improve the performance of diesel engines. Also the market of biodiesel products is still wide open. This market covers the domestic market and international market. In the end of this paper we recomended, the governementt must increase the socialization of the benefits tobacco oil, more tobacco biodiesel industry investment, the new tax policy on tobacco biodiesel and create research agreement with Pertamina or other petroleum industries to build biodiesel industry of tobacco in national scale or international scale.
Filamin A Is Required for Optimal T Cell Integrin-Mediated Force Transmission, Flow Adhesion, and T Cell Trafficking
Authors: Savinko Terhi , Guenther Carla , Uotila Liisa M. , Llort Asens Marc , Yao Sean , Tojkander Sari , Fagerholm Susanna C.
Published: March 2018

T cells traffic from the bloodstream into tissues to perform their functions in the immune system and are therefore subjected to a range of different mechanical forces. Integrins are essential for T cell trafficking into the tissues, as they mediate firm adhesion between the T cell and the endothelium under shear flow conditions. In addition, integrins are important for the formation of the contact between the T cell and the APC required for T cell activation. The actin-binding protein filamin A (FlnA) provides an important link between the integrin and the actin cytoskeleton. FlnA has been reported to function as an integrin inhibitor by competing with talin. However, its role in regulating integrin-dependent immune functions in vivo is currently poorly understood. In this study, we have investigated the role of FlnA in T cells, using T cell–specific FlnA knockout mice. We report that FlnA is required for the formation of strong integrin–ligand bonds under shear flow and for the generation of integrin-mediated T cell traction forces on ligand-coated hydrogels. Consequently, absence of FlnA leads to a reduction in T cell adhesion to integrin ligands under conditions of shear flow, as well as reduced T cell trafficking into lymph nodes and sites of skin inflammation. In addition, FlnA is not needed for T cell activation in vivo, which occurs in shear-free conditions in lymphoid organs. Our results therefore reveal a role of FlnA in integrin force transmission and T cell trafficking in vivo.
High-Precision Mixed-Signal Sensor Interface for a Wide Temperature Range [0–300°C]
Authors: Gläser Georg , Kirsten Dagmar , Richter André , Reinhard Marco , Kropp Gerrit , Nuernbergk Dirk M.
Published: March 2018

Sensor interfacing is a crucial component for today's systems in many application domains. Especially in automotive and manufacturing fields, high temperatures are encountered. For extracting the typically small sensor signals, an interface near the sensor is needed to provide high accuracy and robustness. This results in challenges in circuit design and architecture to avoid temperature-related nonideal effects. In this contribution, we present a novel system architecture for a Wheatstone bridge interfacing system. By encoding the sensor signal in time domain and augmenting the system with additional observations, we present a robust and precise sensor interface operating at up to 300°C without breaking accuracy or functional requirements because of high-temperature effects. We present a realization of this concept proven to be accurate within ±1.3% full scale over the full temperature range.
The ups and downs of the Canadian Shield: 2- preliminary results of apatite fission-track analysis from a 3.6 km vertical profile, LaRonde mine, Quebec
Authors: Pinet N
Published: March 2018

The low-temperature (120-60°C) thermal history of eight samples from a 3.6 km vertical depth profile in the LaRonde Mine (Archean Abitibi greenstone belt, Quebec) has been investigated using apatite fission-track (AFT) analysis. All samples correspond to
greywackes of the Cadillac Formation.
The AFT ages show a clear younging relationship with depth (increasing temperature), as expected for samples that maintained constant relative depths over time. Ages vary from 413 ± 51 Ma near the surface, to 148.5 ± 6.3 Ma for the deepest sample. Forward and inverse modeling indicate that
a scenario with a constant temperature or minor heating during the Paleozoic better accounts for the fission track length distributions than a scenario with a constant cooling rate. These results support the possibility that the Abitibi region was covered by a sedimentary succession of moderate
thickness during the Paleozoic.
Comparison of Disease Activity Score in 28 joints with ESR (DAS28), Clinical Disease Activity Index (CDAI), Health Assessment Questionnaire Disability Index (HAQ-DI) & Routine Assessment of Patient Index Data with 3 measures (RAPID3) for assessing disease activity in patients with rheumatoid arthritis at initial presentation
Authors: Kumar B. Siddhartha , Suneetha P. , Mohan Alladi , Kumar D. Prabath , Sarma K.V.S.
Published: March 2018

Background & objectives:

In patients with rheumatoid arthritis (RA), disease severity assessment is done using Disease Activity Score in 28 joints with ESR (DAS28). Computing DAS28 is time-consuming, requires laboratory testing and an online calculator. There is a need to validate rapid methods of disease severity assessment for routine daily use. This study was conducted to compare DAS28, Clinical Disease Activity Index (CDAI), Health Assessment Questionnaire Disability Index (HAQ-DI) and Routine Assessment of Patient Index Data with 3 measures (RAPID3) to assess the disease activity in patients with RA.

Methods:

We prospectively studied the utility of CDAI, HAQ-DI and RAPID3 scoring in 100 consecutive newly diagnosed, disease modifying antirheumatic drugs (DMARDs) naïve adult patients with RA seen during January 2013 and June 2014 at a tertiary care teaching hospital in south India.

Results:

The mean age of the patients was 42.1±11.6 yr, there were 82 females. The median [interquartile range (IQR)] symptom duration was 6 (range 4-12) months. The median (IQR) DAS28, CDAI, HAQ-DI and RAPID3 scores at presentation were 7 (6-7), 36 (28-43), 2 (1-2) and 17 (13-19), respectively. A significant positive correlation was observed between DAS28 and CDAI (r=0.568; P<0.001); DAS28 and HAQ-DI (r=0.304; P=0.002) and DAS28 and RAPID3 (r=0.404; P<0.001). A ‘slight-to-fair’ agreement was observed in between DAS28 and CDAI (kappa-statistic=0.296). The agreement between DAS28 and HAQ-DI (kappa-statistic=0.007) and RAPID3 (kappa-statistic=0.072) was less robust.

Interpretation & conclusions:

In adult patients with RA, in the setting where illiteracy is high, CDAI emerged as the preferred choice for rapid assessment of severity of disease at the time of initial presentation.
A Study on the Wear Properties of Cu-free Ecofriendly Vehicle Brake Pad
Authors: Kim Ki-Bong , Yang Sangsun , Lee Seong-Ju , Hwang Suk-Hun , Kim Sin-Wook , Kim Yong-Jin
Published: March 2018

The friction characteristics of Al-Fe alloy powders are investigated in order to develop an eco-friendly friction material to replace Cu fiber, a constituent of brake-pad friction materials. Irregularly shaped Al-Fe alloy powders, prepared by gas atomization, are more uniformly dispersed than conventional Cu fiber on the brake pad matrix. The wear rate of the friction material using Al-8Fe alloy powder is lower than that of the Cu fiber material. The change in friction coefficient according to the friction lap times is 7.2% for the Cu fiber, but within 3.8% for the Al-Fe alloy material, which also shows excellent judder characteristics. The Al-Fe alloy powders are uniformly distributed in the brake pad matrix and oxide films of Al and Fe are homogeneously formed at the friction interface between the disc and pad, thus exhibiting excellent friction and lubrication characteristics. The brake pad containing Al-Fe powders avoids contamination by Cu dust, which is generated during braking, by replacing the Cu fiber while maintaining the friction and lubrication performance.
Formation of Uniform SnO2 Coating Layer on Carbon Nanofiber by Pretreatment in Atomic Layer Deposition
Authors: Kim Dong Ha , Riu Doh-Hyung , Choi Byung Joon
Published: March 2018

Carbon nanofibers (CNF) are widely used as active agents for electrodes in Li-ion secondary battery cells, supercapacitors, and fuel cells. Nanoscale coatings on CNF electrodes can increase the output and lifespan of battery devices. Atomic layer deposition (ALD) can control the coating thickness at the nanoscale regardless of the shape, suitable for coating CNFs. However, because the CNF surface comprises stable C–C bonds, initiating homogeneous nuclear formation is difficult because of the lack of initial nucleation sites. This study introduces uniform nucleation site formation on CNF surfaces to promote a uniform SnO2 layer. We pretreat the CNF surface by introducing H2O or Al2O3 (trimethylaluminum + H2O) before the SnO2 ALD process to form active sites on the CNF surface. Transmission electron microscopy and energy-dispersive spectroscopy both identify the SnO2 layer morphology on the CNF. The Al2O3-pretreated sample shows a uniform SnO2 layer, while island-type SnOx layers grow sparsely on the H2Opretreated or untreated CNF.
Fabrication of compact surface structure by molar concentration on Sb-doped SnO2 transparent conducting films
Authors: Bae Ju-Won , Koo Bon-Ryul , Ahn Hyo-Jin
Published: March 2018

Sb-doped SnO2 (ATO) transparent conducting films are fabricated using horizontal ultrasonic spray pyrolysis deposition (HUSPD) to form uniform and compact film structures with homogeneously supplied precursor solution. To optimize the molar concentration and transparent conducting performance of the ATO films using HUSPD, we use precursor solutions of 0.15, 0.20, 0.25, and 0.30 M. As the molar concentration increases, the resultant ATO films exhibit more compact surface structures because of the larger crystallite sizes and higher ATO crystallinity because of the greater thickness from the accelerated growth of ATO. Thus, the ATO films prepared at 0.25 M have the best transparent conducting performance (12.60±0.21 Ω/□ sheet resistance and 80.83% optical transmittance) and the highest figure-of-merit value (9.44±0.17 × 10-3 Ω-1). The improvement in transparent conducting performance is attributed to the enhanced carrier concentration by the improved ATO crystallinity and Hall mobility with the compact surface structure and preferred (211) orientation, ascribed to the accelerated growth of ATO at the optimized molar concentration. Therefore, ATO films fabricated using HUSPD are transparent conducting film candidates for optoelectronic devices.
О числах Новака
Authors: Kalmynin Aleksandr Borisovich
Published: March 2018

Получены новые нижние оценки для количества $\mathscr N_{\mathrm B}(x)$ чисел Новака, не превосходящих данного числа $x$. Кроме того, доказаны зависящие от обобщенной гипотезы Римана верхние оценки для количества простых чисел, делящих числа Новака, и дано описание простых делителей таких чисел Новака $N$, что $2N$ является числом Новака-Кармайкла.
Библиография: 7 названий.
Trazado de armaduras de cinco paños según los tratados. Interpretación del manuscrito de Rodrigo Álvarez
Authors: Candelas Gutiérrez Ángel L.
Published: March 2018

La construcción de armaduras de cubierta de cinco paños se origina como evolución de armaduras de pares a fin de alcanzar la cobertura de mayores luces. En el artículo se interpreta el procedimiento que para tal construcción se incluye en el manuscrito inédito de Rodrigo Álvarez (h. 1674), resultando fundamental la consideración conjunta de circunstancias geométricas y constructivas. Se comprueba su validez para la construcción de armaduras de cinco paños que formen un polígono regular, lo que consigue Álvarez con indiferencia hacia trazados de lacería habituales en estas construcciones. Asimismo se incluyen referencias sobre la misma construcción que aparecen en los textos de Diego López de Arenas (1619 y 1633) y Fray Andrés de San Miguel (h. 1640), y que como veremos utilizan procedimientos muy diferentes.
La articulación de la luz: Le Corbusier
Authors: Escoda Pastor Carmen
Published: March 2018

En el Movimiento Moderno la transparencia de los grandes planos de cristal, independientes de la estructura, se transformó en repertorio básico del lenguaje moderno. Pero los arquitectos se encontraron con grandes problemas de control lumínico y térmico. La dificultad por representarlos y solucionarlos condujo a uno de ellos, Le Corbusier, a iniciar un periodo de investigación que culminó con el diseño de una nueva plástica arquitectónica a partir de elementos pasivos de control térmico, luminíco y de ventilación natural: el brise-soleil, la loggia y el aerateur.

El dibujo y los carnets de viajes constituyeron su principal herramienta de análisis, diseño y cálculo, y lo convirtieron en el gran maestro de la luz. Es a partir de los años 30, tras los viajes a Sudamérica (1929) y a Argel (1933), cuando se replantea nuevos sistemas de protección, analizando la construcción tradicional, de voladizos y muxarabis en el primero, y de las loggias, patios y mashrabiyyas en el segundo.