bluuebunny/crossref_metadata_2025 huggingface dataset:
Methane transport in agricultural soil after injection of isotopically-enriched methane in the sub-surface
Authors: Shaw George , Atkinson Brian , Meredith William , Snape Colin , Lever David , Hoch Andrew
Published: October 2018

Small quantities of radioactive methane (14CH4) may be released over prolonged periods from geological disposal facilities for radioactive waste. The impact of this release depends on the capacity of soil to oxidise 14CH4 to 14CO2 during transport from the sub-surface to the atmosphere. We investigated this capacity by pulse-injecting isotopically-enriched methane 50 cm below the surface of an agricultural soil in central England. Three sequential injections were made during growth of a spring wheat crop. Samples of gas were taken from the pore space throughout the soil profile at predetermined time points after injection, accompanied by samples of the atmosphere above the soil collected in sampling chambers, deployed at scheduled intervals. Methane and CO2 were measured in soil and above-ground gas using gas chromatography; the isotopic composition of CH4 and CO2 was determined using gas chromatography with isotopic ratio mass spectrometry. Supporting measurements of environmental variables were made during the experiment. The data can be used to test mathematical models describing CH4 and CO2 transport and fate in temperate agricultural soils.
Ultrasmall black phosphorus quantum dots: synthesis, characterization, and application in cancer treatment
Authors: Wang Mingqian , Liang Ying , Liu Yajun , Ren Guohong , Zhang Zhicheng , Wu Shishan , Shen Jian
Published: October 2018

We synthesized black phosphorus quantum dots with good fluorescence performance and excellent biocompatibility, and highlighted their great potential in the photothermal therapy of cancer.
Trichain cationic lipids: the potential of their lipoplexes for gene delivery
Authors: Kudsiova Laila , Mohammadi Atefeh , Mustapa M. Firouz Mohd , Campbell Frederick , Welser Katharina , Vlaho Danielle , Story Harriet , Barlow David J. , Tabor Alethea B. , Hailes Helen C. , Lawrence M. Jayne
Published: October 2018

Lipoplexes (LDs) have been prepared from DNA, DOPE and either a dichain oxyethylated cationic lipid or their novel trichain (TC) counterpart.
Structure-inspired design of a sphingolipid mimic sphingosine-1-phosphate receptor agonist from a naturally occurring sphingomyelin synthase inhibitor
Authors: Swamy Mahadeva M. M. , Murai Yuta , Ohno Yusuke , Jojima Keisuke , Kihara Akio , Mitsutake Susumu , Igarashi Yasuyuki , Yu Jian , Yao Min , Suga Yoshiko , Anetai Masaki , Monde Kenji
Published: October 2018

A monophosphate derivative of ginkgolic acid binds to sphingosine 1-phosphate (S1P) receptors to perform similar functions to the lipid mediator S1P.
Fast response two-photon fluorogenic probe based on Schiff base derivatives for monitoring nitric oxide levels in living cells and zebrafish
Authors: Xu Chenchen , Xin Chenqi , Yu Changmin , Wu Meirong , Xu Jiajia , Qin Wenjing , Ding Yang , Wang Xuchun , Li Lin , Huang Wei
Published: October 2018

A novel two-photon fluorogenic probe based on Schiff base derivative for rapidly monitoring nitric oxide level in living cells and zebrafish has been developed.
Correction: A new triazine based π-conjugated mesoporous 2D covalent organic framework: its in vitro anticancer activities
Authors: Kanti Das Sabuj , Mishra Snehasis , Manna Krishnendu , Kayal Utpal , Mahapatra Supratim , Das Saha Krishna , Dalapati Sasanka , Das G. P. , Mostafa Amany A. , Bhaumik Asim
Published: October 2018

Correction for ‘A new triazine based π-conjugated mesoporous 2D covalent organic framework: its in vitro anticancer activities’ by Sabuj Kanti Das et al., Chem. Commun., 2018, 54, 11475–11478.
Reactions of water with radical cations of guanine, 9-methylguanine, 2′-deoxyguanosine and guanosine: keto–enol isomerization, C8-hydroxylation, and effects of N9-substitution
Authors: Sun Yan , Zhou Wenjing , Moe May Myat , Liu Jianbo
Published: October 2018

The reactions of D2O with guanine radical cations in nucleobases and nucleosides were studied in the gas phase using the guided-ion-beam experiment and computational modeling.
Prospects of biosynthesized nanomaterials for the remediation of organic and inorganic environmental contaminants
Authors: Das Surajit , Chakraborty Jaya , Chatterjee Shreosi , Kumar Himanshu
Published: October 2018

Nanotechnology deals with matter at dimensions within 1–100 nm, with such material displaying a wide range of applications in industry, medicine and environmental remediation.
Low cost 3D microfluidic chips for multiplex protein detection based on photonic crystal beads
Authors: Chang Ning , Zhai Jingyan , Liu Bing , Zhou Jiping , Zeng Zhaoyu , Zhao Xiangwei
Published: October 2018

A low-cost three dimensional (3D) microfluidic chip was fabricated and integrated with photonic crystal beads for protein detection and multiplex bioassays.
Fluorescent microsphere probe for rapid qualitative and quantitative detection of trypsin activity
Authors: Song Liping , Zhang Lei , Xu Kai , Huang Youju , Gao Pan , Fang Haiyan , Zhang Jiawei , Nie Zhihong , Chen Tao
Published: October 2018

The fluorescent PS-PEG-peptide-FITC microsphere probe was designed for real-time, qualitative and quantitative monitoring of trypsin activity.
A highly selective and sensitive fluorescent chemosensor for distinguishing cadmium(ii) from zinc(ii) based on amide tautomerization
Authors: Zhang Yuanyuan , Chen Xiangzhu , Liu Jingjing , Gao Gui , Zhang Xueyan , Hou Shicong , Wang Hongmei
Published: October 2018

A naphthalimide-derived fluorescent sensor termed L2 was designed and synthesized.
Assembling exceptionally-structured Janus nanoribbons into a highly anisotropic electrically conductive array film that exhibits red fluorescence and superparamagnetism
Authors: Xi Xue , Yu Wensheng , Li Dan , Ma Qianli , Dong Xiangting , Wang Jinxian , Liu Guixia
Published: October 2018

Exceptive-structured Janus nanoribbons and their array films demonstrating high conductive anisotropism, improved red fluorescence and superparamagnetism were constructed via electrospinning.
Local versus global aromaticity in azuliporphyrin and benziporphyrin derivatives
Authors: Ghosh Abhik , Larsen Simon , Conradie Jeanet , Foroutan-Nejad Cina
Published: October 2018

Magnetically induced current density calculations have elucidated the question of global versus local aromaticity in carbaporphyrinoids and their metal complexes.
Facile preparation of stereochemistry-controllable biobased poly(butylene maleate-co-butylene fumarate) unsaturated copolyesters: a chemoselective polymer platform for versatile functionalization via aza-Michael addition
Authors: Yu Yang , Wei Zhiyong , Leng Xuefei , Li Yang
Published: October 2018

Biobased stereochemistry-controllable poly(butylene maleate-co-butylene fumarate) unsaturated copolyesters were facilely prepared as a chemoselective polymer platform for versatile functionalization via aza-Michael addition.
High-performance alkaline hydrogen evolution electrocatalyzed by a Ni3N–CeO2 nanohybrid
Authors: Sun Zhaomei , Zhang Jiayu , Xie Junfeng , Zheng Xiangjiang , Wang Min , Li Xuemei , Tang Bo
Published: October 2018

A Ni3N–CeO2/TM nanohybrid shows high activity and durability for the alkaline hydrogen evolution reaction, offering 10 mA cm−2 at an overpotential of 80 mV.
Mechanism and origins of chemo- and regioselectivities of (NHC)NiH-catalyzed cross-hydroalkenylation of vinyl ethers with α-olefins: a computational study
Authors: Wu Hongli , Li Xiaojie , Tang Xiangyang , Huang Genping
Published: October 2018

Density functional theory calculations were performed to investigate the (NHC)NiH-catalyzed cross-hydroalkenylation of vinyl ethers with α-olefins.
Themed issue on perovskite solar cells: research on metal halide perovskite solar cells towards deeper understanding, upscalable fabrication, long-term stability and Pb-free alternatives
Authors: Park Nam-Gyu , Huang Jinsong , Qi Yabing
Published: October 2018

This themed issue includes a collection of articles on perovskite solar cells.
Combined effects of osmotic and hydrostatic pressure on multilamellar lipid membranes in the presence of PEG and trehalose
Authors: Al-Ayoubi Samy R. , Schinkel Peter K. F. , Berghaus Melanie , Herzog Marius , Winter Roland
Published: October 2018

Trehalose is able to modulate the membrane order and fluidity under disruptive conditions caused by excluded cosolutes or hydrostatic pressure.
Thermal and thermoelectric properties of monolayer indium triphosphide (InP3): a first-principles study
Authors: Ouyang Tao , Jiang Enlai , Tang Chao , Li Jin , He Chaoyu , Zhong Jianxin
Published: October 2018

Monolayer InP3 is a promising candidate for realizing a multifunctional device that contains both photovoltaic and thermoelectric technologies.
Fullerene-regulated graphene oxide nanosheet membranes with well-defined laminar nanochannels for precise molecule sieving
Authors: Tang Xingyan , Qu Yan , Deng Shun-Liu , Tan Yuan-Zhi , Zhang Qiugen , Liu Qinglin
Published: October 2018

Graphene oxide nanosheet membranes with well-defined laminar nanochannels were constructed using functionalized fullerene as a nano-spacer and a crosslinker. The resultant membranes retain good hydrophilicity and have short laminar channels with precise d-spacing from 0.91 to 1.56 nm and excellent sieving selectivity for organic dyes.
Boosting the thermoelectric performance of misfit-layered (SnS)1.2(TiS2)2 by a Co- and Cu-substituted alloying effect
Authors: Yin Cong , Hu Qing , Tang Mingjing , Liu Hangtian , Chen Zhiyu , Wang Zhengshang , Ang Ran
Published: October 2018

The enhancement of thermoelectric performance is directly triggered by a Co- and Cu-substituted alloying effect in misfit-layered (SnS)1.2(TiS2)2.
Deformable convolutional networks for multi‐view 3D shape classification
Authors: Ma Pengfei , Ma Jie , Wang Xujiao , Yang Lichuang , Wang Nannan
Published: October 2018

This Letter suggests a novel method for improving the robustness and the geometric transformation modelling capability in multi‐view convolutional networks (MVCNNs). First, the deformable convolutional networks are used to learn more details and features related to the geometric transformation which the standard convolutional neural networks cannot handle. Then a view‐pooling layer is specifically designed for combining the descriptors from multiple views as the final representations of the 3D shapes. The key idea is to insert the deformable convolutional layer between the input and convolutional layer, making it possible to solve deformable 3D shape classification problems, which was a challenging task for MVCNN framework. The proposed method achieves state‐of‐the‐art classification results on two subsets of the ModelNet dataset (ModelNet10 and ModelNet40) over previous methods by a significant margin.
InAs/GaAs quantum dot infrared photodetectors on on‐axis Si (100) substrates
Authors: Yoshikawa H. , Kwoen J. , Doe T. , Izumi M. , Iwamoto S. , Arakawa Y.
Published: October 2018

Quantum dot infrared photodetectors (QDIPs) are receiving attention as next generation infrared photodetectors that offer high‐sensitivity and high‐temperature operation. The realisation of QDIPs on silicon (Si) substrates offer further great advantages in terms of cost reduction and higher‐resolution focal plane arrays. Indium arsenide/gallium arsenide QDIPs grown directly on on‐axis Si (100) substrates are demonstrated. These are expected to further reduce fabrication costs by utilising both the monolithic integration of QDIPs with Si readout integrated circuits and also the bare substrate cost (compared with offcut Si substrates). In the device, the peak detectivity at a temperature of 32 K is measured to be 5.8 × 107 cm Hz1/2/W of 6.2 μm at a bias 0.6 V, with a corresponding responsivity of 27 mA/W. This result indicates that QD structures directly grown on on‐axis Si substrates are very promising for the realisation of high‐performance QDIPs with low fabrication cost.
Planck’s dusty GEMS
Authors: Cañameras R. , Nesvadba N. P. H. , Limousin M. , Dole H. , Kneissl R. , Koenig S. , Le Floc’h E. , Petitpas G. , Scott D.
Published: October 2018

We report the discovery of a molecular wind signature from a massive intensely star-forming clump of a few 109 M⊙, in the strongly gravitationally lensed submillimeter galaxy “the Emerald” (PLCK_G165.7+49.0) at z = 2.236. The Emerald is amongst the brightest high-redshift galaxies on the submillimeter sky, and was initially discovered with the Planck satellite. The system contains two magnificient structures with projected lengths of 28.5″ and 21″ formed by multiple, near-infrared arcs, falling behind a massive galaxy cluster at z = 0.35, as well as an adjacent filament that has so far escaped discovery in other wavebands. We used HST/WFC3 and CFHT optical and near-infrared imaging together with IRAM and SMA interferometry of the CO(4–3) line and 850 μm dust emission to characterize the foreground lensing mass distribution, construct a lens model with LENSTOOL, and calculate gravitational magnification factors between 20 and 50 in most of the source. The majority of the star formation takes place within two massive star-forming clumps which are marginally gravitationally bound and embedded in a 9 × 1010 M⊙, fragmented disk with 20% gas fraction. The stellar continuum morphology is much smoother and also well resolved perpendicular to the magnification axis. One of the clumps shows a pronounced blue wing in the CO(4–3) line profile, which we interpret as a wind signature. The mass outflow rates are high enough for us to suspect that the clump might become unbound within a few tens of Myr, unless the outflowing gas can be replenished by gas accretion from the surrounding disk. The velocity offset of –200 km s−1 is above the escape velocity of the clump, but not that of the galaxy overall, suggesting that much of this material might ultimately rain back onto the galaxy and contribute to fueling subsequent star formation.
The s process in AGB stars as constrained by a large sample of barium stars
Authors: Cseh B. , Lugaro M. , D’Orazi V. , de Castro D. B. , Pereira C. B. , Karakas A. I. , Molnár L. , Plachy E. , Szabó R. , Pignatari M. , Cristallo S.
Published: October 2018

Context. Barium (Ba) stars are dwarf and giant stars enriched in elements heavier than iron produced by the slow neutron-capture process (s process). These stars belong to binary systems in which the primary star evolved through the asymptotic giant branch (AGB) phase. During this phase the primary star produced s-process elements and transferred them onto the secondary, which is now observed as a Ba star.

Aims. We compare the largest homogeneous set of Ba giant star observations of the s-process elements Y, Zr, La, Ce, and Nd with AGB nucleosynthesis models to reach a better understanding of the s process in AGB stars.

Methods. By considering the light-s (ls: Y and Zr) heavy-s (hs: La, Ce, and Nd) and elements individually, we computed for the first time quantitative error bars for the different hs-element to ls-element abundance ratios, and for each of the sample stars. We compared these ratios to low-mass AGB nucleosynthesis models. We excluded La from our analysis because the strong La lines in some of the sample stars cause an overestimation and unreliable abundance determination, as compared to the other observed hs-type elements.

Results. All the computed hs-type to ls-type element ratios show a clear trend of increasing with decreasing metallicity with a small spread (less than a factor of 3). This trend is predicted by low-mass AGB models in which 13C is the main neutron source. The comparison with rotating AGB models indicates the need for the presence of an angular momentum transport mechanism that should not transport chemical species, but significantly reduces the rotational speed of the core in the advanced stellar evolutionary stages. This is an independent confirmation of asteroseismology observations of the slow down of core rotation in giant stars, and of rotational velocities of white dwarfs lower than predicted by models without an extra angular momentum transport mechanism.
C-GOALS
Authors: Torres-Albà N. , Iwasawa K. , Díaz-Santos T. , Charmandaris V. , Ricci C. , Chu J. K. , Sanders D. B. , Armus L. , Barcos-Muñoz L. , Evans A. S. , Howell J. H. , Inami H. , Linden S. T. , Medling A. M. , Privon G. C. , U V. , Yoon I.
Published: October 2018

We analyzeChandraX-ray observatory data for a sample of 63 luminous infrared galaxies (LIRGs), sampling the lower-infrared luminosity range of the Great Observatories All-Sky LIRG survey (GOALS), which includes the most luminous infrared selected galaxies in the local Universe. X-rays are detected for 84 individual galaxies within the 63 systems, for which arcsecond resolution X-ray images, fluxes, infrared and X-ray luminosities, spectra and radial profiles are presented. Using X-ray and mid-infrared (MIR) selection criteria, we find AGN in (31 ± 5)% of the galaxy sample, compared to the (38 ± 6)% previously found for GOALS galaxies with higher infrared luminosities (C-GOALS I). Using MIR data, we find that (59 ± 9)% of the X-ray selected AGN in the full C-GOALS sample do not contribute significantly to the bolometric luminosity of the host galaxy. Dual AGN are detected in two systems, implying a dual AGN fraction in systems that contain at least one AGN of (29 ± 14)%, compared to the (11 ± 10)% found for the C-GOALS I sample. Through analysis of radial profiles, we derive that most sources, and almost all AGN, in the sample are compact, with half of the soft X-ray emission generated within the inner ∼1 kpc. For most galaxies, the soft X-ray sizes of the sources are comparable to those of the MIR emission. We also find that the hard X-ray faintness previously reported for the bright C-GOALS I sources is also observed in the brightest LIRGs within the sample, withLFIR> 8 × 1010L⊙.
Approach to tap water safety analysis in terms of biostability
Authors: Tchórzewska-Cieślak Barbara , Papciak Dorota , Pietrucha-Urbanik Katarzyna , Pietrzyk Andżelika
Published: October 2018

The subject of the work is the analysis and assessment of the risk of biological instability of water. The lack of water stability causes the increased susceptibility of the distribution system to secondary microbial contamination of water and constitutes a hazard for consumers’ health. The risk is expressed as the loss of water supply safety and distinguishes a failure of not meeting certain water quality parameters that can influence physico-chemical parameters and the bacteriological quality of the water supplied to the consumers. In the paper the method of analysing and evaluating the risk of loss of biostability of tap water is presented. The presented analysis was performed on the basis of the operating data from the water treatment plant.
Diversification of water supply
Authors: Rak Janusz , Boryczko Krzysztof
Published: October 2018

The subject of the publication is the presentation of a methodology for determining the degree of diversification of water resources in collective water supply systems (= CWSS). Knowing the number of subsystems for water supply and their share of total water production, it is possible to calculate the dimensionless Pielou index. Similarly, the diversification indicators for networked water tanks (number and volume) and pressure pipelines of the second degree pumping station (number and flowability) can be determined. The work presents the calculation of diversification indices for selected CWSS in Poland. The presented methodology gives the possibility of three-parameter evaluation of settlement units with different water demand and different technical structure.
Application of the TEVA-SPOT in designing the monitoring of water networks
Authors: Bałut Alicja , Urbaniak Andrzej
Published: October 2018

TEVA-SPOT software was released in 2008 as a freeware dedicated to water and sewer utilities. It enables modelling of various of measurement points, and built-in tools to conduct more in-depth examinations. This paper presents selected possibilities this program grants in the context of emergencies, terrorist attacks or if it is used as an early warning system. It had gone through a hands-on examination and its results-advantages, difficulties and limitations have as well been described here.
The occurrence of priority substances in surface water
Authors: Moraczewska-Majkut Katarzyna , Kalemba Katarzyna
Published: October 2018

In the article the presence of substances, specified in the Water Framework Directive as a priority, in the aquatic environment was analyzed. The impact of priority substances on organisms especially on human health and ways of reducing their occurrence was discussed. Particular attention was paid to the legal aspects of the presence of these compounds in the aquatic environment and the principles of monitoring of priority substances.
The reduction of 2- and 3-ring PAHs entering to the surface waters in the integrated processes
Authors: Włodarczyk-Makuła Maria , Popenda Agnieszka
Published: October 2018

The aim of the study was to determine the removal of 2- and 3-ring polycyclic aromatic hydrocarbons (PAHs) during oxidation process and during simultaneous oxidation and adsorption processes. Technological research was conducted with the use of biologically treated industrial wastewater. Oxidation was carried out with dihydrogen peroxide. The adsorption process was carried out onto activated carbon. Quantitative and qualitative determination of polycyclic aromatic hydrocarbons was conducted using gas chromatograph and mass spectrometer system. The experiments were conducted under constant pH as well asunder the constant temperature. The oxidation efficiency of the analyzed hydrocarbons under oxidation conditions ranged from 14 to 81%. During the simultaneous oxidation process and adsorption on activated carbon, the PAHs removal ranged from 43 to 100%. The results lead to the conclusions that simultaneous oxidation and adsorption can be successfully apply in the final treatment of industrial wastewater resulting in the minimizing PAHs load entering to the surface waters.
Variability of water intake in settlement units adjacent to Wrocław
Authors: Cieżak Wojciech , Cieżak Jan
Published: October 2018

Water intake in rural settlements adjoining large cities is variable and depends on many factors. In these places increasingly often a change in the character of water use from rural to the one typical of urban housing estates is observed. This is due to the expansion of housing, especially single-family housing, and migration of people from large cities. As a consequence, the standard of home furnishings improves and water is used not only for domestic purposes, but also for watering gardens and greenery, the filling and operation of swimming pools, etc. Considering the above, the authors present the results of own research relating to the analysis of water intake in villages adjacent to Wrocław.
Resource evaluation of geothermal power plant under the conditions of carboniferous deposits usage in the Dnipro-Donetsk depression
Authors: Fyk Mykhailo , Biletskyi Volodymyr , Abbud Mokhammed
Published: October 2018

The objective of the work is to substantiate the actualization of the problem of obtaining geothermal energy from oil and gas wells of oil and gas production facilities in the central-eastern part of the Dnieper-Donetsk Depression (DDD). The research methodology is based on the collection and statistical processing geophysical data of the DDD oil and gas deposits, the use of balance equations for energy and substance matter. The main result of the work is that the principal technological scheme of the geothermal system has been developed and the geothermal potential of oil and gas wells in the experimental zone has been analyzed. There have been considered the technological and ecological aspects of geothermal heat usage from depleted deposits of the DDD wells, which were disclosed into Carboniferous deposits productive horizons.
Analysis of pressure difference changes in respirator filters while dusting
Authors: Cheberiachko Serhii , Yavorska Olena , Cheberiachko Yurii , Yavorskyi Andrii
Published: October 2018

Objective is to determine the relation between pressure difference of a filter and parameters of a filtering layer to lengthen the protection period. The study involved elements of system analysis and mathematical modeling. Basic statements of the theory of nonstationary filtration and aerohydrodynamics were applied to develop a dust-loaded filter model. Dependence of pressure difference in a filter upon certain changes in packaging density of dust-loaded fibers has been determined; the dependence makes it possible to define minimum fiber packaging density to provide maximum dust capacity. To provide maximum dust capacity and high protective efficiency, the number of filtering layers in multilayered filters depends upon dust concentration within the air of the working zone, specified protection level of a respirator, air loss, and maximum dust volume which may be accumulated in the finishing filtering layer in terms of fiber packaging density being determined according to the minimum pressure difference in a filter at final time of respirator operation. A model of changes in pressure difference in filtering respirators in the process of aerosol particles depositing on filters has been improved; contrary to other available models, that one takes into consideration changes in fiber packaging density while dusting, filtration coefficient, and the amount of aerosol particles.
Ecological aspects of managing the stressed-deformed state of the mountain massif during the development of multiple coal layers
Authors: Buzylo Volodymyr , Pavlychenko Artem , Savelieva Tamara , Borysovska Olena
Published: October 2018

The ecological consequences of long-term development of coal deposits for the components of the environment, buildings, communications and infrastructure facilities have been analysed. The stress-deformed state of the rock massif around the preparatory working in the development of multiple coal layers is determined. The parameters of the development of the contiguous layers in the conditions of the mines of the Lviv-Volyn Coal Basin are substantiated. The complex of nature protection measures allowing to reduce the negative consequences of disturbance of the earth’s surface in the development of multiple coal layers is substantiated.
Rheology effect determination of the heterogeneous rock massif on the stress-strain state of the breakage face geomechanical system
Authors: Fomychov Vadym , Pochepov Viktor , Fomychova Liudmyla , Lapko Viktor
Published: October 2018

The purpose of this study is to determine the nature of influence of the rheological properties of the rocks on the results of computational experiments simulating the mine workings contour condition during the breakage face advance. To determine the deformations along the mine workings contour, the calculations have been made of the junction area between the preparatory and stope face mine workings by the finite element method for various parameters of the material models. These data provided the basis for analysis of the patterns development of the rheology modelling influence on the stress-strain state of the geomechanical system. The obtained patterns are described by a function of many variables, and this function determines the limit and degree of rheology effect on the results of calculations. For the first time this pattern takes into account the heterogeneity of the rheological characteristics of rocks and the specifics of the computational domain geometry. The use of the obtained patterns makes it possible to simplify significantly the process of modelling in time and space of the geomechanical systems, which have a complex structure describing the interaction of several objects.
Substantiating rational parameters of a method for shrinkage ore stoping while developing thin-vein steeply inclined deposits
Authors: Shyrin Leonid , Koroviaka Yevhenii , Rastsvietaiev Valerii , Denyshchenko Oleksandr
Published: October 2018

Objective of the paper is to substantiate rational ore-stoping technique while using small wells in the context of thin-vein steeply inclined deposit mining. The technique is based upon the repeated field studies and simulation of ore drawing processes for shrinkage ore stoping in terms of the oriented drilling of periphery holes. A design of a blast-hole charge with low-density porous intermediate layer has been proposed as a result as well as a mechanism of shock-wave propagation within rock mass in the process of thin steeply inclined vein stoping. Scientific novelty is represented by means of analytical results of scientific sources, and dependences of ore losses on the vein wall hypsometry resulting from shrinkage stoping in the context of the technique being proposed. Practical relevance is to substantiate rational parameters of the ore-stoping technique being proposed. The technique involves designs of blast-hole charges with low-density porous intermediate layer in stemming. Moreover, the technique proposes to place the intermediate low-density stemming layer right after a blast hole was charged with explosives and live primers were inserted.
Integrated analysis of geofiltrational parameters in the context of underground coal gasification relying upon calculations and modeling
Authors: Inkin Oleksandr , Tishkov Volodymyr , Dereviahina Nataliia , Sotskov Vadym
Published: October 2018

Objective of the paper is to substantiate and implement the integrated approach aimed at the studies of filtration and mass-transfer processes within roof rocks of coal seams in the context of their underground gasification. Integrity of the studies is substantiated by the use of analytical calculations as well as physical and numerical modeling. Zones with different permeability have been determined and values of specific water inflow have been identified basing upon the performed numerical modeling and involving multicomponent transformations within roof formation. The research data actuality is in the studies of spatial and temporal dynamics of rock technogenic rock permeability above gasification channel depending upon their geological structure which will favour the substantiation of efficient engineering solutions to control a process of underground coal gasification under difficult hydrogeological conditions.
Selective underground mining of complex structured ore bodies of Kryvyi Rih Iron Ore Basin
Authors: Kalinichenko Vsevolod , Pysmennyi Serhii , Shvaher Nataliia , Kalinichenko Olena
Published: October 2018

Selective mining of complex structured ore bodies will enable increased iron content in the mined ore mass in underground mining at Kryvyi Rih iron ore basin applying the existing mining systems. The article determines the way the grade changes in a mine block of a complex structured ore body when applying bulk and selective mining as well as factors influencing indices of extracting ore mass from the block. The investigation results prove that it is reasonable to mine complex structured ore deposits with barren inclusions applying selective mining if the iron content in the block varies from 64 to 67% and horizontal thickness of the barren inclusion makes 4 – 12 m. At that, the thickness ratio should not exceed 0.3. Stoping methods should be applied to receive high indices of ore mass extraction. There is determined an ore/barren inclusion-to-ore body thickness ratio considering the dilution factor that confirms practicability of selective mining of complex structured ore bodies. Selective mining of complex structured ore deposits of Kryvyi Rih iron ore basin applying open stoping enables increasing the mined ore mass quality without considerable capital and operating costs and, consequently, staying on the market and enhancing the environmental situation in the region.
Design of Multicolour LED with Control and Monitoring System for Plant Growth
Authors: Ng Wei Choon , Yunus Nurul Amziah Md , Halin Izhal Abdul
Published: October 2018

The aim of this work is to create an artificial environment LED based for plants where the goal is to control LED lighting and monitor plant growth. This will contribute on issue like food production. This work involves the use of a web development microcontroller kit, which will help to make online or IoT (Internet of Things) project and design easy. The microcontroller will come with an integrated Wi-Fi to collect and control variable parameter and also programming language to develop graphical user interface (GUI). It is expected that the plant growth environment can be monitored and controlled or set through cloud via Wi-Fi on the board. Multicolour light emitting diode (LED) lamps are used. This system will improve the performance of available plant growth area where it will become more flexible in term of providing artificial environment with a better supervision.
Development and Designing Smart Traffic Light with Xbee Pro
Authors: Alfith Alfith , Kartiria Kartiria
Published: October 2018

The main function of the highway are used as a means to facilitate transportation, but today is often challenging due to all road users wanting more quickly reach its destination and precede each other. On the other hand, there is also a special car or entourage effect on traffic density, which in turn impact on congestion. To cope with this is actually the duty of the Traffic Police is not every day got in the way to manage traffic and will not be able to count the number of passing vehicles. To direct the traffic at any place such as a T-junction, an intersection, or intersection five solid pace of the traffic, the necessary traffic arrangements multifunctional tool called Smart Traffic Light. Called smart because the traffic light is deemed able to overcome three problems, such detect traffic density which affects the green light sensor uses the object infrared, able to detect the presence of specific signal from cars special like ambulance or fire engine or police or the like are automatically will change traffic lights red to green light using the XBee wireless module Pro and GPS, and seeks the traffic lights stay lit even though the supply of PLN extinguished using a spare battery. The system is capable of regulating the rate of traffic by arranging alternately road vehicle that passes a certain spot every day for nearly 24 hours a day and on these tools need to pair every day.
The lifting force relationship of a BLDC motor rotor system to the blade rotation speed
Authors: Al Al , Dewi Arfita Yuana , Hidayat Taufal
Published: October 2018

In developing the knowledge and information about the Quadcopter aircraft, the parameters related to aircraft lift capability factors; fly long; flying high; type of motor; the type of propeller; including the sensors and control systems used. To find out of the BLDC motor voltage source to the rotor angle velocity (ω) relationship; rotor speed to wind velocity through rotor (v); rotor speed to rotor lift (Ft); wind speed to rotor lift; push the following rotor (Ct).Test and measurement results data show that; the lift force generated with rotational speed relationship is not proportional Nonlinearity occurs when the rotor is released from the self and starts pulling the strain gauge when the rotation speed reaches around 65 rps. Once the rotation speed of the rotor is able to reach up to 1.5 Newton lift then the thrust rising trend increasing sharply to the increasing the speed of rotation of the rotor. A special rotor that has BLDC motor specifications such as; 1200 KV, 12 Volt and 30 Ampere; blade with a radius of r 0.12 m; at a temperature of about 27 oC; in the condition there are no other wind currents then obtained thrust (Ct) of 1.732.
A True Hybrid Solar Wind Turbine Electric Generator System for Smaller Hybrid Renewable Energy Power Plants
Authors: Al-Ajmi Mohammad Shafi , Mustapha Faizal , Mohd Ariffin Mohd. Khairol Anuar b. , Md Yunus Nurul Amziah , Abdul Halin Izhal
Published: October 2018

Contemporary Hybrid Solar-Wind farms are implemented using separate solar Photovoltaic (PV) cell arrays and wind turbines, where electricity generated from both devices are combined. However, this solution requires a large amount of space to cater for the PV arrays and wind turbines of the system. This paper proposes a new type of renewable energy electric generator with a small power production footprint (PPF) that allows reduction in land usage. The technology introduced in this True Hybrid Wind-Solar (THWS) generator allows for the solar panels to rotate along with a VAWT wind turbine it is attached to through a specially designed electromechanical coupling mechanism. The working principal behind the connections described in this paper. The design of a hybrid circuit module that serves to combine current generated via the solar cells and wind generator and also automatically disconnects inactive wind or solar generators is also described. This is important in order to eliminate unwanted loads generated from the inactive generators from within the THWS itself.
Experimental Study to Performance Improvement of Vapor Compression Cooling System Integrated Direct Evaporative Cooler and Condenser
Authors: Rachman Arfidian , Nesti Lisa
Published: October 2018

For areas with very hot and humid weather condition increased latent and sensible load are a major problem in cooling systems that will increase compressor work so that electricity consumption will also increase. Combined condenser with direct evaporate cooling will increase the heat removal process by using an evaporative cooler effect that will increase the efficiency of energy use. This paper presents the study of the use of evaporator cooling and condenser. This paper mainly calculated energy consumption in steam compression cooling systems and related problems. From the results of this study, the use of condensers with evaporative cooling, power consumption can be reduced to 46% and performance coefficient (COP) can be increased by about 12%, with 1,2 kW cooling capacity.
Windings Design for Single-phase Induction Motors Base on 4-phase Induction Motor (Case study: identical windings design)
Authors: Anthony Zuriman , Erhaneli Erhaneli , Zulkarnaini Zulkarnaini
Published: October 2018

A 1-phase induction motor usually has a complicated windings design which compares to polyphase induction motor. In addition, a large capacitor start is required to operate the motor. It is an expensive way to operate the motor if it compare to polyphase induction motor. So, a new innovation method is required to make the motor more simple and cheaper. This research is purposed to study a new winding design for a single-phase capacitor motor. Winding design of the motor was conducted to a simple winding design like a 4-phase induction motor that has four identical windings. The comparator motor that use in this study was a Three-phase induction motor with data 1400 RPM, 1.5 HP, 50Hz, 380/220V, Y/Δ, 2.74/4.7A, 4 poles, that had the same current rating which the proposed method. The result showed that the motor design on this proposed method could be operated at 88.18 % power rating with power factor close to unity.
Difference in Press Angle to the Quality of Briquettes
Authors: Handra Nofriady , Hafni Hafni , Fahmi Hendriwan
Published: October 2018

The development of biomass has been an important issue for the past several decades and would remain to be attractive in the future due to its clean, renewable, and carbon–neutral properties. The use of Empty Fruit Bunch (EFB) has been the condition of fibre and conditions of EFB is still fresh. The fiber used has been cut to size between ± 0.5 mm to 5 mm. The purpose of this research is to determine the effect of difference press angle to the quality of briquette. Effect of the angle of the mold on the duration of combustion shows the difference in the time value that is not significant between the angles 65°, 55° and 45°. The rotation of the screw shaft slows down at an angle of 45° with a round of 84.5 rpm, while the rotation of the shaft has increased in rotation at 65° angle with rotation of 90.6 rpm. Differences in the cone angle affect the value of the burning time of the specimen and the rotation of the screw shaft so that it affects the engine performance.
Linkage between Flexibility and SMEs Performance: Does Improvisation Matter?
Authors: Arshad Darwina , Zakaria Nazlina , Abdul-Kadir Kadzrina , Ahmad Norzieiriani
Published: October 2018

Small Medium Enterprises (SMEs) has become significant in today’s economic growth. To gain and sustain the SMEs performance, one of the ways the organization should do is to be flexible and improvise in its business activities. The link between flexibility, improvisation and SMEs performance is still vague, thus this paper aims to investigate the effect of improvisation as a mediator between organizational flexibility and SMEs performance. Three hypotheses are put forward to achieve the aforementioned research goal. Obtaining on a survey data from 202 manufacturing SMEs in Malaysia, the findings of the study confirmed that all hypotheses have a positive significant association. Theoretically and in practice, this study denotes rich addition to the vocabulary of business and management.
Multi Criteria Decisions Making approach to choose ‘Integrators’ in Malaysian local broiler industry
Authors: Lamsali Hendrik , Ariffin Ahmad Shabudin
Published: October 2018

The Malaysian broiler industry is an integral component of the agriculture sector that generates sustainable food supplies to almost 30 million populations in the country. The industry comprises of conventional and commercial farms for which the latter is more sustainable with contract farming schemes and involvement of major integrators and growers. The survival of local growers as one of the important players within broiler’s supply chain hierarchy is largely depending on the integrators. Hence, this study aims to identify important factors that local growers consider when selecting their integrators. Specifically, the objectives are to prioritize integrators’ selection factors and to determine the critical ranking of each factor that will be beneficial to the local growers. A MCDM approach in the form of Analytical Hierarchy Process (AHP) is employed to evaluate and rank the importance of the said factors based on inputs from selected broilers’ representatives. Five main criteria are considered in the AHP analysis that include relationships, reliability, logistics, input and price. The result indicates that reliability had the highest priority, followed by pricing factor, input criteria, relationships with the integrator, and finally the logistics facility. For overall sub-criteria, supplied quantity is ranked number one, followed by price of raw materials, availability of day-old chick, quality conformance, technology sharing, and in-house logistics facility. At the end of the study, future research avenues are suggested.
Absorptive capacity in low-tech industry: Case Study of Indonesian Manufacturing Companies
Authors: Ariana Lutfah , Asmara Indri Juwita
Published: October 2018

Innovation has widely recognized as an important factor for driving competitiveness of many firms. In order to generate innovative performances, firms need to improve their capabilities in absorbing knowledge and technology from external sources, which is so called absorptive capacity. This paper will analyze what kind of sources of innovation in manufacturing sectors especially for low tech industries. Focusing on innovation activities, this paper aims to identify what kind of determinants in influencing the difference of absorptive capacity in low tech industries. The source of data is derived from Innovation Survey 2011 held by Center for Science and Technology Development Studies. The survey conducted for 1360 firms in manufacturing sector, in which most of the distribution is mainly consisted of low technology sectors. Instead of quantitative approach, the result is also supported by in depth interview from selected firms observed in 2013. This paper addresses multiple case studies as the qualitative approach, including firms in food and beverages, and jewelry art and design. According to the results, most of low tech companies searched their external sources of knowledge from their market, and customers were the main driver for their innovation output. In respond to this situation, this paper proposes an idea of open innovation for enhancing industrial competitiveness. As policy insights, the sources of competitive advantage in an open innovation setting will encourage the firm to the internal organizational processes that allow a firm to recognize, assimilate and exploit knowledge.
The Impact of Print vs. Digital Resources on Moroccan University Students’ Reading Habits, Uses, and Preferences
Authors: Larhmaid Maryem
Published: October 2018

The widespread use of digital resources, the Internet and the development of technology have brought several significant changes in reading practices, preferences and use among information consumers. Readers of the 21st century have many options for reading thanks to the rapid growth of electronic-based reading materials, instead of printed ones, such as online newspapers, electronic books, digital encyclopedias, and online academic journals, as well as the expansion of e-book readers. All of these have contributed to changing readers’ reading strategies, reading preferences, and attitudes toward the act of reading. In the field of academia, for instance, there has been a tremendous shift from paper-based reading to screen-based reading. Given the fact that digital devices have become pervasive, and that reading has recently become a digital activity, this article proposes the need to investigate the impact of print vs. digital reading materials on Moroccan undergraduate students’ reading behaviors, preferences and use.
L’alternance (néo)codique comme ressource communicative dans les formules de salutations : étude des échanges synchrones entre cyberscripteurs algériens
Authors: Sebiane Hasna
Published: October 2018

Nous nous proposons de contribuer à la réflexion autour de la notion de ressources numériques en nous intéressant à la communication médiée par ordinateur. Nous nous intéresserons particulièrement au fonctionnement de l’alternance (néo)codique comme ressource langagière numérique qui participe lors de l’interaction à distance à l’organisation séquentielle des échanges entre cyberscripteurs algériens. En effet, les ressources langagières et linguistiques constituées à partir de nouveaux corpus de communication numérique écrite sont susceptibles d’intéresser les chercheurs en sciences du langage. Ce travail sera, de fait, consacré à l’analyse de l’alternance codique et de son aspect fonctionnel à partir des échanges synchrones écrits sur Facebook, où le choix des langues s’avère être accompli collaborativement par les cyberscripteurs. Cet accomplissement relève du processus d’alignement et d’ajustement codique, voire parfois de négociations mutuelles qui participent à la co-construction de la communication en ligne.