bluuebunny/crossref_metadata_2025_split huggingface dataset:
Verbal working memory as a predictor of explicit and implicit knowledge of English passive voice
Authors: Pawlak Mirosław , Biedroń Adriana 
Published: October 2019

Abstract
While there is copious evidence concerning the effectiveness of different instructional options in teaching
grammar (e.g., Nassaji, 2017; Pawlak, 2017),
less is known about the extent to which the contribution of pedagogical intervention is mediated by individual factors. The same
can be said about the product of instructed but also uninstructed second language acquisition, that is the knowledge of target
language grammar. The paper attempts to shed light on one such variable, that is working memory, which has recently been an object
of intensive empirical inquiry (e.g., Li, 2017; Wen, Biedroń, & Skehan, 2016). It reports the results of a study that investigated the role of verbal working
memory in the development of explicit and implicit knowledge of the English passive voice. Participants were 156 Polish university
students enrolled in a three-year BA program in English. The data on verbal working memory were collected by means of the
Polish Listening Span Test (PLSPAN), developed by Zychowicz, Biedroń and
Pawlak (2017). Explicit knowledge was tapped by means of an untimed grammatically judgment test, which focused on
reception, and a traditional grammar test, which targeted production. Implicit knowledge was tapped through a timed grammaticality
judgment test for reception and a focused communication task (Ellis, 2003) for
production. Correlational analysis demonstrated that verbal working memory was a weak predictor of explicit productive and
receptive knowledge but not implicit knowledge.
Perspective: optically-pumped III–V quantum dot microcavity lasers via CMOS compatible patterned Si (001) substrates
Authors: Wei Wenqi , Feng Qi , Wang Zihao , Wang Ting , Zhang Jianjun 
Published: October 2019

Abstract
Direct epitaxial growth III–V quantum dot (QD) structures on CMOS-compatible silicon substrates is considered as one of the most promising approaches to achieve low-cost and high-yield Si-based lasers for silicon photonic integration. However, epitaxial growth of III–V materials on Si encounters the following three major challenges: high density of threading dislocations, antiphase boundaries and thermal cracks, which significantly degrade the crystal quality and potential device performance. In this review, we will focus on some recent results related to InAs/GaAs quantum dot lasers on Si (001) substrates by III–V/IV hybrid epitaxial growth via (111)-faceted Si hollow structures. Moreover, by using the step-graded epitaxial growth process the emission wavelength of InAs QDs can be extended from O-band to C/L-band. High-performance InAs/GaAs QD micro-disk lasers with sub-milliwatts threshold on Si (001) substrates are fabricated and characterized. The above results pave a promising path towards the on-chip lasers for optical interconnect applications.
Recent advances of heterogeneously integrated III–V laser on Si
Authors: Guo Xuhan , He An , Su Yikai 
Published: October 2019

Abstract
Due to the indirect bandgap nature, the widely used silicon CMOS is very inefficient at light emitting. The integration of silicon lasers is deemed as the ‘Mount Everest’ for the full take-up of Si photonics. The major challenge has been the materials dissimilarity caused impaired device performance. We present a brief overview of the recent advances of integrated III–V laser on Si. We will then focus on the heterogeneous direct/adhesive bonding enabling methods and associated light coupling structures. A selected review of recent representative novel heterogeneously integrated Si lasers for emerging applications like spectroscopy, sensing, metrology and microwave photonics will be presented, including DFB laser array, ultra-dense comb lasers and nanolasers. Finally, the challenges and opportunities of heterogeneous integration approach are discussed.
III–V compound materials and lasers on silicon
Authors: Yang Wenyu , Li Yajie , Meng Fangyuan , Yu Hongyan , Wang Mengqi , Wang Pengfei , Luo Guangzhen , Zhou Xuliang , Pan Jiaoqing 
Published: October 2019

Abstract
Silicon-based photonic integration has attracted the interest of semiconductor scientists because it has high luminous efficiency and electron mobility. Breakthroughs have been made in silicon-based integrated lasers over the past few decades. Here we review three main methods of integration of III–V materials on Si, namely direct growth, bonding, and selective-area hetero-epitaxy. The III–V materials we introduced mainly include materials such as GaAs and InP. The lasers are mainly lasers of related communication bands. We also introduced the advantages and challenges of the three methods.
Dynamics of InAs/GaAs quantum dot lasers epitaxially grown on Ge or Si substrate
Authors: Wang Cheng , Zhou Yueguang 
Published: October 2019

Abstract
Growing semiconductor laser sources on silicon is a crucial but challenging technology for developing photonic integrated circuits (PICs). InAs/GaAs quantum dot (Qdot) lasers have successfully circumvented the mismatch problem between III–V materials and Ge or Si, and have demonstrated efficient laser emission. In this paper, we review dynamical characteristics of Qdot lasers epitaxially grown on Ge or Si, in comparison with those of Qdot lasers on native GaAs substrate. We discuss properties of linewidth broadening factor, laser noise and its sensitivity to optical feedback, intensity modulation, as well as mode locking operation. The investigation of these dynamical characteristics is beneficial for guiding the design of PICs in optical communications and optical computations.
Synthesis, characterization, fabrication and application of electrospun nanofiber polymer composite: a potential bio-material for black mold rot (Aspergillus niger) of onions (Allium cepa L.)
Authors: De La Rama EM , Lavarias J , Monserate J 
Published: October 2019

Abstract
Nanomaterial is widely researched because of its enormous potential. In this study, the anti-fungal activity of electrospun nanofiber polymer composites infused with malunggay extracts (ME) was investigated. Cellulose acetate (CA) from abaca fiber, nano silica (nSiO2) from rice husks, and nano copper oxide nCuO from cavendish banana peel were synthesized, characterized and used as stabilizing agent. Electrospun nanofiber polymer composites infused with malunggay extracts was successfully fabricated. The inhibitory effects of the fabricated nanofiber were determined using different concentrations of ME. Results showed that 100 % concentration of malunggay extract (ME) mixed with 50 mg of nSiO2 and 50 mg of nCuO) had a presence of small crystal-like structures that indicates the successful infusion of the bio-materials. The nanofibers showed inhibitory effect against A. niger both in in vitro and in vivo. It displayed the highest zone of inhibition, lowest weight loss and disease severity index which is comparable to the fungicide. This study confirms the antifungal potential of the Electrospun nanofiber polymer composites infused with malunggay extracts on the test fungi and suggests the possibility of employing them in food preservation were spoilage is mainly caused by A. niger.
On the Role of Plasmonic Nanoparticles on the Photocatalytic of TiO2 Nanoparticles for Visible-Light Photoreduction of Bicarbonate
Authors: Khalil Munawar , Mulyanto Muhammad Fariz , Gunlazuardi Jarnuzi 
Published: October 2019

Abstract
The potential application of anatase titanium dioxide (TiO2) nanoparticles for solar fuel generation has been recently attracting many attentions due to its excellent chemical stability. Nevertheless, the fast charge recombination during photoexcitation process may often reduce the photocatalytic activity. This work presents the role of plasmonic Au nanoparticles on enhancing the photocatalytic activity of TiO2 nanoparticles for a visible-light-driven conversion of bicarbonate to formate. Here, two types of nano-sized Au and TiO2 heterostructures, i.e., Au-TiO2 Janus nanostructures and core-shell Au@TiO2 nanostructures were successfully prepared and characterized using UV-Vis and HR-TEM. Results demonstrated that Au-TiO2 Janus nanostructures had a superior photocatalytic activity compared to TiO2 nanoparticles and core-shell Au@TiO2 nanostructures. This photocatalytic enhancement is believed due to the presence of surface plasmon resonance (SPR) phenomenon in Au nanoparticles that provides a Fermi energy level, which could prevent the charge recombination process during photoexcitation.
Mechanical properties and morphology of electrospun mats made of poly (ω-pentadecalactone)
Authors: Pavlova E R , Nifant’ev I E , Minyaev M E , Bagrov D V , Klinov D V 
Published: October 2019

Abstract
Electrospinning of biodegradable poly(ω-pentadecalactone) (PPDL) is poorly investigated. In the present work, PPDL homopolymers of different molecular weight were synthesized by ring-opening polymerization of ωPDL, and then electrospun. Mixtures of PPDL with hexafluoro-2-propanol (HFIP) and with HFIP-chloroform blend were used for electrospinning. Since PPDL is poorly soluble in HFIP at high concentrations, the PPDL-HFIP mixture was turbid and its electrospinning led to heterogeneous mats. Addition of 30% of chloroform to the PPDL-HFIP mixture turned it into a transparent solution. After electrospinning, the PPDL-HFIP-chloroform mixtures yielded mats, which consisted of flat and round fibers with a wrinkled surface. The flat fibers (ribbons) were observed more frequently when the PPDL sample with the highest molecular weight was electrospun. All the obtained electrospun mats demonstrated high elongation at break (from 150% to 350%). In our future research, these mats will be examined as biomaterials.
Chitosan coating by mechanical milling of MnFe2O4 and Mn0.5Co0.5Fe2O4: Effect of milling
Authors: Mdlalose W. B. , Dlamini S. , Moyo T. , Mokhosi S. R. , Singh M. 
Published: October 2019

Abstract
Manganese ferrite (MnFe2O4) and manganese-cobalt ferrite (Mn0.5Co0.5Fe2O4) fine powders were produced by glycol-thermal technique. Fine powders were then milled with chitosan for different times ranging from 5 hours to 60 hours. XRD patterns of the as-prepared and milled oxides confirm cubic phase structure with an average crystallite size of 11 nm. The observed values of lattice parameter decrease with milling due to the inversion of cations induced by milling. TEM results reveal nanoparticles with spherical shape and average particle sizes correlating to XRD data. No aggregation of particles was observed after milling suggesting effective chitosan coating. Magnetization studies performed at room temperature in fields up to 14 kOe revealed the superparamagnetic nature of both naked and coated nanoparticles with spontaneous and saturation magnetizations decreasing with milling. Larger coercive fields observed in Mn-Co oxides were attributed to higher magnetic anisotropy associated with Co ions. A reduction of coercive field due to milling duration was observed. 57Fe Mössbauer spectra of Mn0.5Co0.5Fe2O4 samples show ordered magnetic states, while paramagnetic nature is revealed in MnFe2O4 samples. Hence, current results suggest that chitosan coating can be successfully achieved through mechanical milling resulting in nanoparticles with potential for biomedical applications. The differences in the magnetic properties of the samples are discussed based on Stoner-Wohlfarth theory.
Photoinduced birefringence in azopolymer doped with Au nanoparticles
Authors: Nazarova D , Nedelchev L , Stoykova E , Blagoeva B , Mateev G , Karashanova D , Georgieva B , Kostadinova D 
Published: October 2019

Abstract
A study of the photoinduced birefringence in nanocomposite thin films of the azopolymer PAZO (poly[1-[4-(3-carboxy-4-hydroxyphenylazo)benzenesulfonamido]-1,2-ethanediyl, sodium salt]) doped with gold (Au) nanoparticles (NPs) is presented. The NPs are with a spherical shape and mean size 10 nm. Transmission electron microscopy (TEM) and Dynamic Light Scattering (DLS) analyses of the particles have also been made. Samples were prepared with five different concentrations of the NPs in the azopolymer films varying from 0 (non-doped azopolymer film) to 4 a.u. (1 a.u. = 0.015 wt %). Birefringence was induced by a He-Cd laser with a wavelength 442 nm and measured with probe Diode Pumped Solid State (DPSS) laser at 635 nm. An increase of the photoinduced birefringence in doped azopolymer nanocomposite films compared to samples of undoped azopolymers was observed. The maximal enhancement was achieved for films with 2 a.u. of Au NPs.
Enhancement of magneto-optical properties in magnetic photonic crystal slab waveguide based on yttrium iron garnet
Authors: Saker K , Bouchemat T , Lahoubi M , Bouchemat M 
Published: October 2019

Abstract
In this work, a polarization-independent waveguide based on magnetic photonic crystal (MPC) with a triangular lattice of air holes in Yttrium Iron Garnet (YIG) slab grown on alumina (Al2O3) substrate is proposed, where both TE-like and TM-like periodic band gaps overlap. YIG is well known for its attracting magneto-optical (MO) properties and used to produce a coupling between the TE and TM modes. Thus, a nonreciprocal effect can be obtained by applying an external magnetic field parallel to the direction of propagation. At 1550 nm, the complete photonic band gap is simulated and optimized using the three dimensional plane-wave expansion method. The aim of this study is to enhance Faraday rotation (FR) while maintaining a low modal birefringence. A numerical analysis in function of magnetic gyration (g) has been reported, using the BeamProp software. The results reveal a proportional relation between FR, Δ
n
and g, such for g = 0.5, a large FR of 26.11×104 °/cm with Δ
n
= 7×10−6. The results show a real improvement of this MPC structure based on YIG with larger FR, lower modal birefringence and minimal losses. The notable enhancement in the MO behaviour could improve the performance of optical isolators, and makes it suitable for nonreciprocal devices.
Synthesis and Characterization of Ordered Mesoporous Carbon CMK-3 with a High Loading Capacity of Ibuprofen and its Release Performance at Simulated Body Fluid
Authors: Ulfa Maria , Prasetyoko Didik 
Published: October 2019

Abstract
In this paper, ordered mesoporous carbon CMK-3 have been synthesized via hard templating methode using mesoporous silica as template followed by thermal carbonization. The resulting ordered mesoporous carbon sample have been loaded by ibuprofen as anti inflammantory drug model up to 75% (w/w). Characterization of textural and structural resulting ordered mesoporous carbon was examined by transmission electron microscopy, small angle X-ray scattering, Fourier transform infrared spectroscopy and nitrogen adsorption-desorption. The high loading ibuprofen effect in release performance have been reviewed and it appears that ibuprofen loading on ordered mesoporous carbon surface can be release up to 50% in simulated body fluid at pH 7.4 for 200 min. Result shows that high ibuprofen loading not only change the textural and structural material but also have great impact for release performance. Key Word: ordered mesoporous carbon, CMK-3, ibuprofen, high loading, release.
In-situ synthesis of CdS@TiO2 Nanoparticles-nanobelt Heterojunctions with high photocatalytic property
Authors: Wang YM , Du G J , Qi M L 
Published: October 2019

Abstract
In this study, CdS nanoparticles were in-situ deposited on the surface of TiO2 nanorods through the liquid phase synthesis method, and the CdS@TiO2 Nanoparticles-nanobelt heterojunctions were obtained. The nanobelts are 50-200nm in width and several tens of micrometers in length, while the size of CdS nanoparticles is about 10 nm. The photocatalytic properties of the products were also studied and the results showed that the photocatalytic activity of CdS@ TiO2 heterostructure is improved greatly compared with that of the common nanobelts. This is attributed to the different band energy structure of the two semiconductors, facilitating efficient charge separation and migration.
Experimental description of aging of palm oil kernel shell powder/epoxy composite
Authors: Valášek Petr , Habrová Karolína , Müller Miroslav 
Published: October 2019

Abstract
Aging of polymeric materials is one of the application limits of these materials. Describing the degradation will help determine the life cycle of the product, describing the degradation process is so important in determining possible application spheres. The paper focuses on the degradation of the matrix composite in the form of epoxy resin and palm oil kernel shells (PKS). Handling bio-waste arising from oil palm processing is a great challenge, material use of these commodities is an interesting alternative to other options. The filler was of irregular particle size up to 100 μm the filler concentration in the matrix was 2.5, 5.0 and 10.0 wt.%. Renewable resources are increasingly promising options for sustainable material engineering. The presence of organic microparticles can optimize some mechanical characteristics and reduce the cost of the resulting material. Microscopy was used to assess interphase interference and microscopic analysis of the surface and particle shape. The contribution showed that the presence of organic particles in the matrix did not significantly affect the decrease of mechanical properties due to degradation in laboratory conditions. Specifically, these were experiments in the climatic chamber where humidity and temperatures varied between + 70 ° C and -40 ° C for 840 hours. The decrease in shear strength on steel adherence reached 3.99 MPa in the unfilled resin and 5.77 MPa (10% PKS) in the palm kernel shell resin.
Potential adsorption mechanisms of different bio-wastes to remove diazinon from aqueous solution
Authors: Sean Sitha , Binh Quach An , Tungtakanpoung Dondej , Kajityichyanukul Puangrat 
Published: October 2019

Abstract
This paper investigated the isotherms, kinetics, and mechanisms of three types of bio-waste derived from agro-waste, synthesized as potential adsorbents in diazinon extraction from aqueous solution. The adsorption capacity that differentiates each of the bio-wastes were discussed. Bio-wastes were synthesized for 4 h at a temperature of 600 °C. Bio-wastes were modified by hydrofluoric acid (HF) to enhance the specific area and porosity. The SEM, BET, FT-IR, and pHpzc were used to analyse the characteristics of the bio-wastes. Experimental results showed the different BET specific surface areas ranged from 67.42 to 402.43 m2.g−1 of each bio-waste. Meanwhile, SEM showed that bio-wastes possessed an intricate pore network comprising micropores and narrow mesopores. The pore volume disseminations in the size of the micropores (<2 nm) and narrow mesopores (2-20 nm) of bio-wastes in the range of 16.88-21.24% and 56.57-69.22%, respectively. Solution pH at 4 carried out the highest removal efficiency of diazinon. Langmuir isotherm model showed the best fit to the experimental adsorption data. The maximum adsorption capacities of bio-wastes ranged from 8.60-15.83 mg.g−1. The pore filling and chemical adsorption participated in the adsorption mechanisms of diazinon and other bio-wastes.
Heritage Building Era Detection using CNN
Authors: Samaun Hasan Md. , Ali Mohammad , Rahman Mizanur , Arju Hosne Ara , Alam Mirza Mohtashim , Salah Uddin Md. , Allayear Shaikh Muhammad 
Published: October 2019

Abstract
The Indian subcontinent is a southern area of Asia continent which includes India, Bangladesh, Pakistan, Nepal, Bhutan, Maldives, and Sri Lanka. In the different periods, different rulers had ruled in these territories such as the Sultanate period (1206–1526) and Mughal period (1526–1540, 1555–1857). In addition, various ancient and heritage structure patterns show the different historical and religious characteristics of the old civilizations. This research presents a computational method for identifying the construction period or era of old heritage building by using feature detection. We have done this experiment for the application aspect, where the tour guide is not available this application will help the tourists for knowing the construction period or era by detecting the features of old spectacular architecture. In this study, we have focused on the constructional characteristics of old architectural sites by using Canny Edge Detector method. After using the Canny Edge Detector method, we have categorized different types of features among the buildings such as Dome, Minaret or Tower, Ratna, and Front. The different eras old structure contains different characteristics of the Dome, Minaret or Tower, Ratna, and Front. Finally, we have developed a neural network based model which can identify the building’s construction era of the Sultanate period and Mughal period.
Study of nano bioactive glass for use as bone biomaterial comparison with micro bioactive glass behaviour
Authors: Rocton N , Oudadesse H , Mosbahi S , Bunetel L , Pellen-Mussi P , Lefeuvre B 
Published: October 2019

Abstract
This research is based on the study of bioactivity kinetic in function of the glass particles size. Bioactive glasses have been elaborated in the ternary system SiO2-CaO-P2O5. Nano bioactive glass and micro bioactive glass have been synthesized by using two different processes. They are destined for use as bone biomaterials. The comparison was focused on the kinetic of the development of a calcium phosphate layer on their surfaces after immersion in a Simulated Body Fluid (SBF). The first bioactive glass BG is a melting-made glass with a particles size of about 60 μm. The second bioactive glass NBG is a sol-gel made glass through an emulsion system of synthesized particles of about 110 nm. The growing of the calcium phosphate layer at the surface of the glasses has been followed using several physicochemical techniques. Obtained results show the development of a calcium phosphate layer similar to carbonated hydroxyapatite. It crystallises in a hexagonal system with an P63/m space group. While melting-made glass needs 14 days to develop carbonated hydroxyapatite like crystal, sol-gel needs only 3 days to develop similar crystals. This difference offers wide opportunities and complementarities for the use of nano or micro bioactive glasses in the biomedical field.
Influence of additional elements (Si, Ti and B) on the microstructure, mechanical properties and castability of aluminum alloys (A201)
Authors: Majid S A E , Bamberger M , Katsman A 
Published: October 2019

Abstract
Improving the castability, mechanical properties and modifying the microstructure of the A201 alloy (Al - 4.97wt. % Cu – 0.56 wt. % Ag) were done by adding Si, Ti and B elements. The four alloys of A201 with additions of: (1) Si, (2) Ti and B, (3) Si, Ti and B, (4) non, were investigated in the as-cast, solution treated at 550°C for 20 hr and aged at 170°C up to 32 days conditions. Combination of different microscopes (HRSEM/EDS, TEM) and microhardness tests were used to investigate how the alloy properties influenced by the precipitation. Additions of Si resulted in the grain coarsening and an increase in the amount of near-grain boundary secondary phases. Additions of Ti and B resulted in the grain refinement, prevented hot tears, but caused a large amount of Al3Ti phase which makes the melt more viscose, and less fluid and castable. The mechanisms of the influence were recognized as facilitating the GP zones nucleation: Si atoms provide more probable homogeneous nucleation of the <001>α GP zones transforming to θ″ phase during aging; TiB2 particles serve as the sites for heterogeneous nucleation of <111>α GP zones which then transform to Ω phase. The precipitation sequence during aging was the following: SSSS → GP zones → θ″+ Ω → θ′ + Ω → θ′ → θ. The maximum microhardness was achieved with two kinds of semi-coherent precipitates in the structure: θ′ (Al2Cu-tetragonal) and Ω (Al2Cu-orthorhombic). Therefore, joint additions and corresponding thermal treatment can provide optimal microstructure and mechanical properties of the A201 based alloys.