bluuebunny/crossref_metadata_2025 huggingface dataset:
GAISRO POVEIKIO TYRIMAS TINKUOJAMO FASADO ANGOKRAŠČIUI
Authors: Veliseičik Tomaš , Šarauskas Tomas , Lazdauskas Laurynas , Guoga Edmundas
Published: March 2020

Tyrimams atlikti buvo įrengti keturi tinkuojamieji fasadai su termoizoliacinėmis medžiagomis po tinku.
Visų keturių bandinių angokraščiai buvo įrengti skirtingai: keičiant dekoratyvinio tinko storį arba keičiant įrengimo technologiją.
Tyrimais nustatyta, kad tinkuojamo fasado sistemos atitiktis DIN 4102-20 (projektas) standartui nepriklauso nuo angokraščio
įrengimo tipo ir technologijos. Taip pat nustatyta, kad angokraštis, kuris buvo suformuotas iš plastikinio kampinio profiliuočio
su laštakiu, išlaikė ilgesnį gaisro poveikį negu angokraštis, kuris buvo armuojamas stiklo audiniu. Atlikus tyrimus ir išanalizavus
duomenis prognozuojama, kad kitos konstrukcijos – vėdinamojo fasado – angokraščio destrukcija gali lemti nekontroliuojamą ugnies
plitimą fasado konstrukcijos tuštuma.
Comparing Short Gamma-Ray Burst Jet Structure Models
Authors: Hayes Fergus , Heng Ik Siong , Veitch John , Williams Daniel
Published: March 2020

A structured gamma-ray burst (GRB) jet could explain the dimness of the prompt emission observed from GRB 170817A, but the exact form of this structure is still ambiguous. However, with the promise of future joint gravitational wave (GW) and GRB observations, we shall be able to examine populations of binary neutron star (BNS) mergers rather than on a case-by-case basis. We present an analysis that considers GW triggered BNS events both with and without short GRB counterparts assuming that events without a counterpart were observed off-axis. This allows for Bayes factors to be calculated to compare different jet structure models. We perform model comparison between a Gaussian and power-law apparent jet structure on simulated data to demonstrate that the correct model can be distinguished with a log Bayes factor of >5 after fewer than 100 events. Constraints on the apparent structure jet model parameters are also made. After 25(100) events the angular width of the core of a power-law jet structure can be constrained within a 90% credible interval of width ∼9.1(4.4)°, and the outer beaming angle to be within ∼19.9(8.5)°. Similarly, we show the width of a Gaussian jet structure to be constrained to ∼2.8(1.6)°.
Multiwavelength Study of an X-Ray Tidal Disruption Event Candidate in NGC 5092
Authors: Li Dongyue , Saxton R. D. , Yuan Weimin , Sun Luming , Liu He-Yang , Jiang Ning , Cheng Huaqing , Zhou Hongyan , Komossa S. , Jin Chichuan
Published: March 2020

We present multiwavelength studies of a transient X-ray source, XMMSL1 J131952.3+225958, associated with the galaxy NGC 5092 at z = 0.023 detected in the XMM-Newton SLew survey (XMMSL). The source brightened in the

band by a factor of

in 2005 as compared with previous flux limits and then faded by a factor of >200 as observed with XMM-Newton in 2013 and with Swift in 2018. At the flaring state the X-ray spectrum can be modeled with a blackbody at a temperature of ∼60 eV and an overall luminosity of

erg s−1. A UV flare and optical flare were also detected with the Galaxy Evolution Explorer and the Sloan Digital Sky Survey, respectively, within several months of the X-ray flare, whose nonstellar UV–optical spectrum can be described with a blackbody at a temperature of

K and a luminosity of

erg s−1. Interestingly, mid-infrared monitoring observations of NGC 5092 with the Wide-field Infrared Survey Explorer 5–13 yr later show a continuous flux decline. These dramatic variability properties, from the X-ray through UV and optical to infrared, appear to be orderly, suggestive of a stellar tidal disruption event (TDE) by a massive black hole, confirming the postulation by Kanner et al. This TDE candidate belongs to a rare sample with contemporaneous bright emission detected in the X-ray, UV, and optical, which are later echoed by dust-reprocessed light in the mid-infrared. The black hole has a mass of

10

, residing in a galaxy that is dominated by a middle-aged stellar population of 2.5 Gyr.
MOCMC: Method of Characteristics Moment Closure, a Numerical Method for Covariant Radiation Magnetohydrodynamics
Authors: Ryan Benjamin R. , Dolence Joshua C.
Published: March 2020

We present a conservative numerical method for radiation magnetohydrodynamics with frequency-dependent full transport in stationary spacetimes. This method is stable and accurate for both large and small optical depths and radiation pressures. The radiation stress–energy tensor is evolved in flux-conservative form, and closed with a swarm of samples that each transport a multigroup representation of the invariant specific intensity along a null geodesic. In each zone, the enclosed samples are used to efficiently construct a Delaunay triangulation of the unit sphere in the comoving frame, which in turn is used to calculate the Eddington tensor, average source terms, and adaptively refine the sample swarm. Radiation four-forces are evaluated in the moment sector in a semi-implicit fashion. The radiative transfer equation is solved in invariant form deterministically for each sample. Since each sample carries a discrete representation of the full spectrum, the cost of evaluating the transport operator is independent of the number of frequency groups, representing a significant reduction of algorithmic complexity for transport in frequency-dependent problems. The major approximation we make in this work is performing scattering in an angle-averaged way. Local adaptivity in samples also makes this scheme more amenable to nonuniform meshes than a traditional Monte Carlo method. We describe the method and present results on a suite of test problems. We find that Method of Characteristics Moment Closure converges at least as ∼N
−1, rather than the canonical Monte Carlo N
−1/2, where N is the number of samples per zone.
Spectropolarimetric Analysis of FRB 181112 at Microsecond Resolution: Implications for Fast Radio Burst Emission Mechanism
Authors: Cho Hyerin , Macquart Jean-Pierre , Shannon Ryan M. , Deller Adam T. , Morrison Ian S. , Ekers Ron D. , Bannister Keith W. , Farah Wael , Qiu Hao , Sammons Mawson W. , Bailes Matthew , Bhandari Shivani , Day Cherie K. , James Clancy W. , Phillips Chris J. , Prochaska J. Xavier , Tuthill John
Published: March 2020

We have developed a new coherent dedispersion mode to study the emission of fast radio bursts (FRBs) that trigger the voltage capture capability of the Australian SKA Pathfinder (ASKAP) interferometer. In principle the mode can probe emission timescales down to 3 ns with full polarimetric information preserved. Enabled by the new capability, here we present a spectropolarimetric analysis of FRB 181112 detected by ASKAP, localized to a galaxy at redshift 0.47. At microsecond time resolution the burst is resolved into four narrow pulses with a rise time of just 15 μs for the brightest. The pulses have a diversity of morphology, but do not show evidence for temporal broadening by turbulent plasma along the line of sight, nor is there any evidence for periodicity in their arrival times. The pulses are highly polarized (up to 95%), with the polarization position angle varying both between and within pulses. The pulses have apparent rotation measures that vary by

and apparent dispersion measures that vary by

. Conversion between linear and circular polarization is observed across the brightest pulse. We conclude that the FRB 181112 pulses are most consistent with being a direct manifestation of the emission process or the result of propagation through a relativistic plasma close to the source. This demonstrates that our method, which facilitates high-time-resolution polarimetric observations of FRBs, can be used to study not only burst emission processes, but also a diversity of propagation effects present on the gigaparsec paths they traverse.
A Nonthermal Bomb Explains the Near-infrared Superflare of Sgr A*
Authors: Gutiérrez Eduardo M. , Nemmen Rodrigo , Cafardo Fabio
Published: March 2020

The Galactic center supermassive black hole, Sgr A*, has experienced a strong, unprecedented flare in 2019 May when its near-infrared luminosity reached much brighter levels than ever measured. We argue that an explosive event of particle acceleration to nonthermal energies in the innermost parts of the accretion flow—a nonthermal bomb—explains the near-infrared light curve. We discuss potential mechanisms that could explain this event such as magnetic reconnection and relativistic turbulence acceleration. Multiwavelength monitoring of such superflares in radio, infrared, and X-rays should allow a concrete test of the nonthermal bomb model and put better constraints on the mechanism that triggered the bomb.
First record of a freshwater bryozoan species in Cuba: Plumatella repens (Linnaeus, 1758) (Phylactolaemata, Bryozoa)
Authors: Carballeira Rafael , Romay Cosme D. , Ramos Atocha
Published: March 2020

The discovery of Plumatella repens floatoblasts in wetlands of the La Niña Bonita Reservoir and the Ciénaga de Zapata Swamp, Cuba, constitutes the first record of a freshwater bryozoan species on the island and extends the distribution range of the species in the insular Caribbean. Unlike the inland waters of the Lesser Antilles the greater availability of water and lower salinity are likely the main factors that determine the distribution of P. repens in the Greater Antilles.
Corrigenda: Hanah, a replacement name for Hana Lau, Stokvis, Ofwegen & Reimer, 2018 (preoccupied name)
Authors: Lau Yee Wah , Stokvis Frank R. , van Ofwegen Leen , Reimer James D.
Published: March 2020

This is an addendum to the availability of the generic name Hana Lau, Stokvis, Ofwegen & Reimer, 2018 within the octocoral family Arulidae. Here, the replacement name Hanah is proposed, as Hana Lau, Stokvis, Ofwegen & Reimer, 2018 is a junior homonym to senior homonym Hana Kukalova-Peck, 1975, a genus within the family Hanidae of the Palaeozoic insect order Megasecoptera.
L’image de soi dans le travail de vieillir
Authors: Charazac Pierre
Published: March 2020

Les changements de l’image de soi au cours de la vieillesse sont corrélatifs d’une révision des images parentales qui s’opère au double niveau des images oedipiennes et de leurs prototypes archaïques, les imagos. La résurgence de celles-ci dans la psychothérapie et la clinique ne soutient pas seulement le moi menacé par une affection altérant le fonctionnement psychique mais conduit l’image de soi tardivement dédoublée à se réunifier au moment du trépas sous l’égide de l’imago maternelle.
User Experience Based Mobile Application Design for Boat Loaning at Marine Tourism in Indonesia
Authors: Prakasa Fedelis Brian Putra , Radja Melky , Suyoto Suyoto
Published: March 2020

Introduction: Boat loaning in marine tourism in Indonesia significantly impacts the continuity of tourism activities. It is because some nautical tourism destinations in Indonesia use ships as a means of transportation that cannot be separated from tourism activities. The problem is, there is a lack of information availability for examples event information, destination, and access for boat loaning. That makes it difficult for tourists to be able to enjoy marine tourism. Purpose: Therefore, the use of this study is to design a prototype of a mobile application that can help overcome the problem of limited information and access to marine tourism transportation, and be able to answer the needs of tourists regarding tourist information using the user experience as a design system. Method: The user experience method will be applied in application design testing, to obtain development aspects in the ship transportation ordering application, according to user needs. Result: The results of this study are the prototype design based on the user experience. The final result shows 87.5% response agree with this prototype design. Contribution: This study applies the method of boat loaning by utilising cooperation between agents and ship providers to provide Ease of access to information on marine tourism transportation to prospective tourists.
Mobile Based Decision Support System of Supplier Evaluation
Authors: Effendy Faried
Published: March 2020

Supplier evaluation activities play a key role in the organization because they can significantly reduce the price of goods and increase company competitiveness. On the other side demands for aspects of quality, delivery time, and costs in increasingly globalized market competition add to the complexity of supplier selection decisions.
This research proposes to build a mobile-based decision support system of supplier evaluation using VlseKriterijumska Optimizacija I Kompromisno Resenje (VIKOR) method. VIKOR method focuses on ranking by compromising from existing alternative results. The system will produce output in the form of supplier evaluation rankings and will use as a recommendation for management to assist supplier evaluation. Evaluation results show that the system is useful and suit for the users.
Integrating Flash Cards with Narratives for Mobile Learning of English Vocabulary
Authors: Lai Chien-Hung , Jong Bin-Shyan , Hsia Yen-Teh , Lin Tsong-Wuu
Published: March 2020

The world has seen a rapid development in mobile devices in recent years. Mobile devices have the advantage of immediacy and convenience. Their uses are not restricted to desktops and classrooms. Many assisted learning systems run on mobile devices. These systems give students the opportunity to learn anytime and anywhere. Language learning is one of the key research issues underlying the development of such systems. There are many ways to use mobile devices to teaching English. This includes the use of pictured flash card to learn English vocabulary, a teaching approach that has been shown to be effective. In the current research, an assisted learning system was developed for learning English vocabulary. It combines pictured flash cards with stories. The goal was to see whether the addition of stories to pictured flash cards for learning English vocabulary could have a significant effect on learning motivation, learning achievement, and anxiety. As the result of an associated educational experiment showed, students generally agreed with the use of such a system to help them learn English vocabulary, and they also made use of leisure time to learn. Compared to students using “plain” pictured flash card for learning, students using pictured flash cards with stories had a significantly lower level of anxiety, and they also learn better as far as learning motivation and achievement were concerned.
Efficient RTS and CTS Mechanism Which Save Time and System Resources
Authors: Mohammed Bahaa Kareem , Alsaidi Saif Ali , Chisab Raad Farhood , Alrikabi Haider
Published: March 2020

It is a well-known fact that the forthcoming names are distinctively different: interference range, career sense, and transmission. The given paper reveals the underlying study of disengagement of a request to send (RTS)/ clear to send (CTS) dialog. It was basically adopted under the influence of both; the presence of distributed coordination function of IEEE 802.11 and a sub-layer protocol which is called media access control (MAC) protocol. The demonstration was seen when applying a type of traffic flows such as Constant Bit Rate (CBR), Transmission Control Protocol (TCP), and besides User Datagram Protocol (UDP). When these are applied the output performance in term of throughput shows a very linear topology configuration of the network. To sum up, a new RTS /CTS mechanism was proposed based on the results obtained from the above suggestions. The detailing for the new mechanism showed that a terminal node will be responsible for deciding if it is authorized to use an RTS/CTS protocol dialog to send one of its packets or not. Needless to say, this process will be dynamic in nature.
Little Brown Bats Utilize Multiple Maternity Roosts Within Foraging Areas: Implications for Identifying Summer Habitat
Authors: Slough Brian G. , Jung Thomas S.
Published: March 2020

Identifying habitat features that may influence the survival and fitness of threatened species is often constrained by a lack of information about the appropriate scale for habitat conservation efforts. Canada's Species at Risk Act lists little brown bats Myotis lucifugus as Endangered and there is a need to determine the scale for delineating important summer habitat features that should be protected. We used a 19-y dataset of banded little brown bats in a 15,000-km2 area of southern Yukon, Canada, to examine fidelity to roost sites and potential foraging areas. We captured and banded 4,349 bats during 208 live-trapping sessions at maternity roosts. Adult females used multiple roosts during the maternity period, separated by up to 6.1 km, within foraging areas, to which individuals exhibited fidelity. Our fidelity rates (≤ 60.5%) are the lowest, and roost-switching rates (≤ 35.5%) the greatest, reported for little brown bats. A small percentage (14.0–20.7%) of females banded as juveniles returned to their natal roosts or foraging areas as adults. We infrequently observed long-distance (25–200 km) switching to novel foraging areas (< 1% of banded bats). We established bat houses to mitigate the loss of a cabin roost; 46.3% of the bats banded at the cabin occupied these houses. The longest documented period of roost fidelity was 18 y, by a female banded as an adult. Roost fidelity by returning adult females declined annually by 3.8–5.3% due to natural mortality, roost switching, or dispersal. Having a choice of multiple maternity roosts within a foraging area may permit little brown bats to select optimal microclimatic conditions throughout the maternity season. Given that fidelity to foraging areas may be higher than to specific roost sites for little brown bats, identification of summer habitat based on foraging areas may be a more effective conservation strategy than relying solely on roost sites.
Apports de la géochimie isotopique de bivalves dulcicoles à la reconstitution paléoenvironnementale en milieu urbain : le cas de la ville de Lyon
Authors: Le Callonnec Laurence , Gaillot Stéphane , Belavoine Juliette , Pons Fabien
Published: March 2020

L’installation et le développement de la ville de
Lyon depuis l’Antiquité ont été en partie influencés par le
fonctionnement des deux cours d’eau qui encadrent la presqu’île : la
Saône et le Rhône. Des coquilles de lamellibranches et de gastéropodes
dulçaquicoles ont été récoltées dans des niveaux archéologiques afin
d’étudier l’enregistrement isotopique (δ13C et
δ18O) de ces biominéralisations. En effet, la
malacofaune enregistre plus ou moins directement les changements
hydrologiques et climatiques. L’étude s’est focalisée sur deux
périodes climatiques extrêmes : l’Optimum Climatique Médiéval et le
Petit Âge Glaciaire. Une troisième période moins documentée correspond
au Haut-Empire Romain (Antiquité). Les sites étudiés sont localisés
sur la presqu’île : près de la rive gauche de la Saône, à proximité de
l’ancienne zone de confluence et près de la rive droite du Rhône, en
contrebas de la colline de Fourvière à proximité de la rive droite de
la Saône.

Toutes les coquilles ont une signature isotopique
caractéristique de la Saône. Cela semble indiquer une utilisation
privilégiée des alluvions de cette rivière par l’Homme. Des
paléotempératures de l’eau de la Saône ont été estimées entre 17,2 et
18,5 °C. Elles montrent un écart moyen de près de 1,3 °C entre l’OCM
et le PAG. Les coquilles du Haut-Empire enregistrent des températures
intermédiaires (18,1 °C). Au Moyen Âge, autour de l’an mil, le δ13C très négatif des coquilles correspondrait à des
épisodes de tourbification et de paludification des berges dû à une
accalmie du régime hydrologique de la rivière et à un réchauffement
climatique. Cette étude montre l’intérêt de l’enregistrement
géochimique des coquilles de mollusques comme archive climatique à
haute résolution temporelle (année), en domaine continental et
notamment en milieu urbain. Ce milieu peut en effet être marqué par
une variabilité rapide et fréquente et par la disparition de nombreux
autres marqueurs du fait de l’activité humaine.
The biggest Opus doliare production in Narbonese Gaul revealed by archaeometry (first to second centuries A.D.)
Authors: Carrato Charlotte , Martínez Ferreras Verónica , Dautria Jean-Marie , Bois Michèle
Published: March 2020

This article presents an overview of recent research on dolia (large storage jars) from the former province of Narbonese Gaul. It aims to bring to light a poorly known aspect of the Roman period, namely the production and diffusion of dolia, thought archaeometrical evidences. Thus, the largest workshop of dolia in Narbonese Gaul has been recognized by combining archaeometrical, geological and archaeological data.
Optimization of Hydrothermal Temperature and Time Parameters in the Synthesis of Hierarchical ZSM-5 from Kaolin by Taguchi Method
Authors: Qoniah Imroatul , Prasetyoko Didik , Hartati Hartati , Nikmah Yatim Lailatul
Published: March 2020

Hierarchical ZSM-5 was successfully synthesized by hydrothermal crystallization of kaolin clay. A statistical experimental design Taguchi method with analysis of variance (ANOVA) with an L9 Orthogonal array (OA) was used to optimize the formation of high mesoporosity in hierarchical ZSM-5. Samples from kaolin mixtures crystallized at 80-175°C for 12, 24 and 48 h, respectively using hydrothermal followed by addition of mesoporogen cetyltrimethylammonium bromide (CTABr) surfactant. The presence of pentasil zeolite groups and large mesopores surface area and pore volume has observed on the samples by FTIR and N2 adsorption-desorption technique.The optimum synthesis conditions studied by Taguchi analysis based on S/N ratio for temperature and time of hydrothermal. The optimum condition was 127.5°C and 48 h giving the highest mesoporosity. Data analysis of interaction plot for S/N ratio showed there was interaction between temperature and time in the crystallization of hierarchical ZSM-5. Hydrothermal temperature was the most influencing factors for the formation of hierarchical ZSM-5 with a percent contribution of 83%.
The Study of Cationic Modification of Welan Gum
Authors: Arbaa'in Norhanis , Bin Roslan Rasidi , Ismail Jamil , Rahim Mohd Hasbi Ab. , Mohd Tahir Farizah Khairin
Published: March 2020

In the present study, welan gum (WG) was modified with a quaternary amine group producing cationic welan gum (CWG) to enhance its thermal and viscosity properties. N-(3-chloro-2-hydroxypropyl) trimethyl ammonium chloride (CHPTAC) was used as the source of the quaternary amine group. The effect of CHPTAC amount in the presence of NaOH was investigated and analyzed using Fourier transform infrared (FTIR), Field emission scanning electron microscope (FESEM), thermal and viscosity analysis. The viscosity results were increases as the amount of CHPTAC increased. From the thermal analyses, it is observed that the CWG has better thermal resistance compared to WG. This study showed that modification of WG by attaching quaternary amine group on the hydroxyl group is promising for the exploration of the high-temperature reservoir.
Mechanical Properties of Graphite Filled Unsaturated Polyester and Unsaturated Polyester/Palm Oil Blend Resin
Authors: Mustapha Siti Noor Hidayah Binti , Bin Azhman Muhammad Syafiq Asyraf , Zakaria Shamsul , Bin Roslan Rasidi , Binti Mustapha Rohani , Lee Tee Chuan
Published: March 2020

This research aim to investigate the effect of graphite loadings in unsaturated polyester (UPE) / acrylated epoxidized palm oil (AEPO) blend resin. The modification of epoxidized palm oil (EPO) to AEPO was carried out using acrylation process and further blended with synthetic UPE resin. Graphite powder was added at 0.03, 0.05 and 0.1 phr into the UPE/AEPO blend resin and cured in an oven at 100 °C and 160 °C. FTIR spectrums showed the disappearance of oxirane ring and existence of carbon double bond indicating successful of AEPO synthesis process. Tensile and Izod impact test revealed that, graphite showed different effects to neat UPE and UPE/AEPO blend resin. In neat UPE, graphite significantly improved the stiffness properties at 0.1 phr additions. However in UPE/AEPO blend resin, the toughness properties were improved with increased graphite loadings.
Production of Bio-Ethanol via Hydrolysis and Fermentation Using Cassava Peel and Used Newspaper as Raw Materials
Authors: Mutiara Tintin , Widiawati Siska , Rachmatyah Syafira , Chafidz Achmad
Published: March 2020

Cassava peel and used newspaper are example of daily solid wastes that continue to increase in Indonesia from year to year. Most of people in Indonesia have not utilized cassava (Manihot Esculenta L.) peel and used newspaper properly, hence they only become untreated wastes. Cassava peel highly contains carbohydrate and starch which is about 44 - 59%, while newsprint contains quite a lot of cellulose which is 61%, so that both wastes have the potential to make bio-ethanol as a one of potential renewable energy source. The focus of this study is to produce bio-ethanol from these two waste materials. There were several stages to produce bio-ethanol, which are hydrolysis with 0.1 N hydrochloric acid (HCl), and fermentation with yeast (Saccharomyces Cerevisiae), and separation of the bio-ethanol by distillation. The content of bio-ethanol produced was analyzed by Gas Chromatography (GC). The bio-ethanol was produced under different variables, which are: amount of yeast (8 g and 10 g), fermentation time (3, 7, and 10 days), and ratio of volume of solution (mL) cassava peel waste : used newspaper (i.e. 80:20; 60:40; 50:50; 40:60). The GC analysis results showed that the bio-ethanol contents were approximately 0%, 6.194%, 8.421% and 8.887% for ratio volume of solution (mL) cassava peel waste : used newspaper of 80:20; 60:40; 50:50; 40:60, respectively. Whereas, the bio-ethanol contents for 3, 7, and 10 days of fermentation time were 6.690%, 8.765%, and 9.472%, respectively. In this study, the highest bio-ethanol content produced (i.e. 9.472%) was in the following variables: amount of yeast 10 g, 10 days fermentation time, ratio volume of solution (mL) cassava peel waste : used newspaper of 50:50.
Oral Microbiome in Children with Caries: A Systematic Review
Authors: Ramli Muhammad Zaki , Azmi Nina Suhaity
Published: March 2020

Oral caries remains a significant public health problem and affects children with early childhood caries (ECC) and severe early childhood caries (S-ECC). However, the mechanisms of these complex multi-species communities are not well understood. This article systematically reviews the studies involving children with caries to learn the demographics of the subjects, their subjects and types of sample, the methodological approaches undertaken, the main findings, and eventually to make recommendations for future research. A search using a designated search string in the Web of Science resulted in 148 articles. A careful examination of each article based on the inclusion criteria resulted in a final 40 articles. Most of the studies were conducted in the United States and China. The studies involved mostly, but not exclusively, children with primary dentition and were having caries. Different types of subjects were sampled from different racial backgrounds and diseases. Different samples were collected, such as supragingival plaque, saliva and biofilm. Clonal analyses and anaerobic approaches were used to characterise the oral microbiome, including shotgun sequencing, pyrosequencing of 16S rRNA genes, and Pacbio sequencing. Firmicutes, Actinobacteria, Bacteroidetes, and Proteobacteria were among the phyla commonly reported by the studies. Streptococcus mutans was a key aetiologic agent in the development of caries, besides Veillonella, Prevotella spp. and Lactobacillus spp. Some studies developed models and discussed the applications of oral microbiome in relation to diseases. We recommend further reviews on studies strictly on children with caries and studies involving children only for a better generalisation of the findings. More studies relating oral microbiome with dietary intake and other diseases can also be conducted.
Phytochemical Analysis and GC-MS Profiling in the Flower of Plumeria alba
Authors: Mohamad Siti Aisyah , Adzahar Noor Suhana , Akhtar Muhammad Nadeem , Zareen Seema , Lee Thong Chuan
Published: March 2020

Therapeutic properties of the medicinal plant are due to the presence of phytochemical constituents. The phytochemical constituents of Plumeria alba flower were investigated by phytochemical screening assays and gas chromatography-mass spectrometry (GC-MS). The phytochemical screening of hexane, dichloromethane, ethyl acetate, butanol, and aqueous extracts of P. alba flower showed it contains a various concentration of saponins, flavonoids, tannins, steroids, volatile oil and phenolic compounds. Several major chemical constituents that were identified is squalene, bis(2-ethylhexyl) phthalate, methyl (methyl 4-O-methyl-α-d-mannopyranoside) uronate and tricyclo [7.2.0.0(2,6)] undecan-5-ol, 2,6,10,10-tetramethyl- (isomer 2) by using GC-MS technique.
Synthesis and Characterization of Polycaprolactone/Cellulose Acetate by Electrospinning for Wound Dressing Applications
Authors: Suteris Nurul Nadirah , Misnon Izan Izwan , Bin Roslan Rasidi , Zulkifli Farah Hanani , Venugopal Jayarama Reddy , Yusoff Mashitah Mohd , Rajan Jose
Published: March 2020

Cellulose as a renewable material has received enormous interest in recent time with an effort to minimize the environmental load from mining earthborn functional materials as well as reducing carbon footprint. This work demonstrates that high quality cellulose could be produced from empty fruit bunch of oil palm plantation and could be developed into nanofibers. A small amount of poly (ε-caprolactone) (PCL) was added to the EFB driven cellulose acetate (CA) to develop them as nanofibers by electrospinning technique; this composition was further enhanced by adding curcumin, which is a natural anti-inflammatory, and compared their morphology, structure, mechanical and surface properties.
The Effect of Green Body Pressure, Sintering Time and Electric Current on ZnO Crystal Growth by Electric Current Heating Method
Authors: Ling Aw Fong , Shaitir Ali , Legowo Ari , Sutjipto Agus Geter Edy
Published: March 2020

There are three objectives to be achieved in this research which include to synthesis high purity ZnO pellets with different sintering time and green body pressure by using powder metallurgy process, the growth of ZnO crystal on ceramic bar by applying different current when conducting electric current heating (ECH) method and the characterization of ZnO crystal growth. In this research, high purity of ZnO powder is grinded and compressed at 3.5 tons, 4.5 tons and 5.5 tons to fabricate ZnO green pellets. Then, the ZnO green pellets are sintered for 3 hours and 5 hours. Next, the pellets are cut into bars and apply ECH method. The amount of current applied for the crystal growth are 2A and 3A. Finally, the crystal grown on the ZnO ceramic bar is characterized using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Ultraviolet-visible Spectroscopy (UV-Vis) and Photoluminescence Spectroscopy (PL). High purity ceramic pellets are successfully synthesis by powder metallurgy process. By conducting ECH method, crystal are grown on the surface of ceramic bar. Most crystal structure found in ZnO ceramic bar is needle-liked rod structure which is hexagonally formed by many nanorod. The crystal grown in (100) orientation with the crystalline size of from 57.80 nm to 100.31 nm. The band gap energy obtained from UV-Vis were found between 3.2 eV to 3.4 eV which is nearly similar to the theoretical value of 3.37 eV. Lastly, PL emission measurement give the peak that range between 579 nm to 587 nm which indicate that the sample exhibit yellow colour. Among three different pressure applied, 4.5 tons gives the lowest emission energy. It is considered as the critical pressure in the synthesis of ZnO crystal. The intensity of PL is considered inversely proportional to intensity of XRD in [100] direction. Pressing pressure doesn’t show significant effect on the crystal growth of ZnO but current applied during ECH method and sintering time do give effect on UV-Vis absorption spectra and XRD result respectively.
Preliminary Study on Micropropagation of Hylocereus polyrhizus with Waste Coconut Water and Sucrose
Authors: Ng Zhe Cheng , Tan Suat Hian , Shiekh Mahmud Siti Hamidah Radiyah , Ma Nyuk Ling
Published: March 2020

Mature coconut water is always been thrown away as a waste. However, it contain a lots of nutritional elements such as amino acids, pytohormones and minerals. Plant needs some essential nutrients besides pytohormones for their growth and development. In this study, the effect of waste mature coconut water and sucrose was observed on the micropropagation of dragon fruit tree (Hylocereus polyrhizus). The stem was inoculated on MS medium containing Benzyleaminopurine (BAP) 0.03mg/L BAP and 0.01mg/L Naphthaleneacetic acid (NAA) supplemented with waste mature coconut water in various concentrations (0%, 2%, 4% and 6% v/v) and with various concentrations : 0%, 1%, 2% and 3% of sucrose respectively. As the concentration of the waste mature coconut water and sucrose increased up to 4 % and 3%, increase in the elongation of the stem and the number of root regenerated per explant was observed repectively. In conclusion, waste mature coconut water has enhanced the elongation of the shoots but has not promoted on the root induction with the suitable amount of sucrose.
The Performance of Membranes Interlayer-Free Silica-Pectin Templated for Seawater Desalination via Pervaporation Operated at High Temperature of Feed Solution
Authors: Elma Muthia , Pratiwi Amalia Enggar , Rahma Aulia , Rampun Erdina Lulu Atika , Handayani Noni
Published: March 2020

Recently, water scarcity is the big issues around the world. Especially in coastal area where the water distribution could not entranced and able to supply clean water for the citizen. The one and only solution is processing seawater to produce fresh and potable water. The desalination process using membrane was recommended to solve this issue. Due to that, the membrane with good structure and high hydro-stability was necessary to fabricate. The aim of this work is to investigate the performance of silica-pectin membranes for treating seawater by pervaporation employing silica based membranes. In this work, the silica-pectin membranes were successfully fabricated using Tetraethyl orthosilicate (TEOS) as silica precursor. Then, pectin from apple was also using in various concentrations (0; 0.1 to 0.5%). This organic material was implemented as a templating agent to produce in silica-pectin thin film. This thin films were dipcoated onto membranes support during membranes fabrication. These membranes were calcined in air at 300 and 400°C using rapid thermal processing (RTP) technique. All membranes were tested for water desalination via pervaporation set-up in various feed temperatures (25, 40 and 60°C). Results show that the membranes produced were crack-free and no pore dense. The FTIR-spectra and Fityk analysis refer to membrane of 2.5% at 300°C and 0.5% at 400°C are the optimum condition due to silanol and siloxane concentrations. An excellent performance was obtained at 0.5% at 400°C with water flux of 8.3 kg.m-2.h-1 and high salt rejection of 99.4% at 60 °C of feed temperature. It clearly demonstrates that the silica-pectin membrane has a robust structures due to the templating of carbon chains into silica matrices. The presence of carbon chains in silica matrices may form the smaller and robust pores as expected, that makes the excellent salt rejection in high feed temperature.
The Characterization of Banana Blossom Peel and Floret as an Adsorbent for the Removal of Manganese in Groundwater
Authors: Omar Suhair , Yusoff Nor Syahidah Mohd , Muhamad Mimi Suliza , Hamidon Nuramidah , Hamid Nor Hazren Abdul , Harun Hasnida , Sunar Norshuhaila Mohamed , Ali Roslinda
Published: March 2020

Manganese (Mn) is one of the most serious pollutants that have negative effects on the ecosystem and water supply. The water industry faces major challenges in its treatment for contaminant and in developing an alternative product with low cost. Among various adsorbents, agriculture waste is preferred due to its biodegradability and availability. The removal of manganese (Mn) from groundwater was investigated using two different adsorbents which are banana blossom peel and floret. SEM analysis shows the formation of microporous structure for both banana blossom peels and floret while FTIR analysis confirms the functional group of strong hydroxyl group that responsible for the adsorption process. The water quality index for the groundwater sample was classified into class III which required extensive treatment. Batch adsorption experiments revealed that both adsorbents had maximum removal efficiency using 0.5 g adsorbent dosage. The banana blossom peel reduces Mn to 0.10 mg/L with 81.1% removal, while the banana blossom floret reduces Mn concentration to 0.12 mg/L with 77.7% removal.
Effect of Co0.5Ni0.5Fe2O4 Nanoparticles Addition in Ag-Sheathed Bi-2223 Superconductor Tapes Prepared by Co-Precipitation Method
Authors: Mazwir Muhammad Hafiz , Balasan Bryan Andrew , Zulkifli Farah Hanani , Abd-Shukor Roslan
Published: March 2020

Effect of complex magnetic oxide Co0.5Ni0.5Fe2O4 (CNFO) nanoparticles addition in (Bi1.6Pb0.4)Sr2Ca2Cu3O10 (Bi-2223) superconductor tapes was investigated. Ultrafine Bi-2223 powder precursor was prepared via co-precipitation method and was added with 0.01 – 0.05 wt.% Co0.5Ni0.5Fe2O4 nanoparticles during the final heating stage. The sample with 0.01 wt.% addition, Bi-2223(CNFO)0.01 was found to have the highest critical current density, Jc. This sample were then chosen to be fabricated into Ag-sheathed superconductor tapes using the powder-in-tube (PIT) method. The tapes were sintered for 50 and 100 h at 845 °C. The phase, microstructure and Jc of the samples were determined by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and four point probe, respectively. Jc of Ag-sheathed Bi-2223(CNFO)0.01 tapes sintered for 100 h was 19830 A/cm2 at 30 K and 3970 A/cm2 at 77 K compared to tapes without addition which showed a much lower Jc(6370 A/cm2 at 30 K). This study showed that CNFO nanoparticles could act as an effective flux pinning centers to enhance the critical current density in the Bi-2223 superconductor.
Investigation Simulation Based on Bio-Energy Local Area Photosensitizer in Increasing Dye-Sensitized Solar Cells (DSSC) Performance
Authors: Supriyanto Edy , Kartikasari Henry Ayu , Alviati Nova , Harsono Soni Sisbudi , Sutjipto Agus Geter Edy
Published: March 2020

The photosensitizer is an important part of Dye-Sensitized Solar Cells (DSSC). Photosensitizers function like photosynthesis by absorbing sunlight and turning it into energy. Photosensitizers also contribute to the efficiency of improving DSSC performance. This research is a continuation of previous research to find a candidate for natural and environmentally friendly photosensitizer (bio-energy) based local area in Indonesia. The photosensitizer used in this simulation is Tagetes erecta, Nyctanthes arbor-tritis, Brassica rapa Sub. Sp pekinensis, Delonix regia, Lawsonia inermis, Callistemon citrinus, and Daucus Carota. The purpose of this simulation is finding several candidates for bio-energy local area photosensitizer that produce high efficiency by displaying J-V curves and P-V curves. The highest efficiency was produced by photosensitizer Tagetes erecta at 1.5% [Voc 0.6385 Volt, 0.00383 A / cm2 Jsc, FF 0.605 and Pmax 0.00148 Watt], while the lowest efficiency was produced by photosensitizer Callistemon citrinus at 1.1% [Voc 0.6162 Volt, Jsc 0.0032 A / cm2, FF 0.557 and Pmax 0,0011 Watts]. These simulation results perform that one of reason give influence at DSSC performance is the absorption coefficient value in each bio-energy local area photosensitizer. The absorption coefficient also determines how much efficiency is produced and how much the photosensitizer's ability to absorb sunlight.
Sample Preparation of TiO2 Added ZnO Using Powder Metallurgy Route and its Characteristics
Authors: Sutjipto Agus Geter Edy , TI LOW , Asmara Yuli Panca , Legowo Ari
Published: March 2020

Metal oxide semiconductor gas sensors have been widely utilized in a variety of different roles and industries. They are relatively inexpensive, robust, lightweight, long lasting and benefit from high material and quick response time compared to other sensing technologies. However, there are major challenges need to overcame by developers in order to construct a semiconductor metal oxide gas sensor that is efficient, and durable and most importantly can work at lower temperature. Therefore, in this research, TiO2 dopants was introduced into conventional high purity ZnO gas sensor whereby the samples were prepared in pellet form using powder metallurgy route. The improvement in the mechanical properties as well as the electrical properties of the samples was wished to be observed through this research. The density measurement showed that the adding of TiO2 was efficient to promote the densification of ZnO sample in which 9 wt% TiO2 doped ZnO sample showed the highest density. The XRD results showed that the diffraction pattern was basically attributed to the wurtzite structure of ZnO. This was proven by the plane (1 0 1) had the highest intensity in all the samples except 6 wt% TiO2 and 9 wt% TiO2 doped ZnO sample. SEM showed that the grain size of ZnO decreased with the addition of TiO2. This was caused by the formation of the new phase which was Zn2TiO4. The smaller the grain size, the higher the specific surface area and oxygen adsorption quantity, and therefore the higher the gas sensitivity is. UV-Vis showed that the wavelength of all samples was located around 380 nm. Therefore, the calculated exitonic energy was around 3.20 eV which was nearly matched with the theoretical band gap of ZnO (3.37 eV). The measurement of the resistivity using four point probe showed that the electrical resistivity of the samples decrease up to addition of 9 wt% TiO2. This was attributed to increased carrier concentration. Vickers hardness test showed that the doping of TiO2 had increased the hardness of the sample whereby the 9 wt% TiO2 doped ZnO sample showed the highest value of hardness. The addition of TiO2 into high purity ZnO has influenced the mechanical and electrical properties of ZnO. From observing the microstructural and density measurement to the measurement of the surface resistivity as well as the determination of the Vickers hardness value, it was found that 9 wt% TiO2 doped ZnO was predicted as a candidate for substituting a conventional high purity ZnO as the gas sensor.
Study of Ionic Liquids (AIL and PIL) Viscosity and its Functional Groups under Heat Treatment on Cutting Tool Surface Using Fourier-Transform Infrared Spectroscopy (FTIR)
Authors: Md. Yasser Mona Alis , Embong Zaidi , Rahim Erween Abdul , Sani Amiril Sahab Abdullah , Kamdani Kamaruddin
Published: March 2020

This study was conducted to investigate the efficiency of Minimum Quantity Lubrication (MQL) technique by using Modified Jatropha Oil (MJO) bio-based lubricant with the presence of 10% Ammonium Ionic Liquid (MJO+AIL10%) and 1% Phosphonium Ionic Liquid (MJO+PIL1%) additives respectively at various temperature of 200 °C, 300 °C and 400 °C heat treatment to determine the ability to exhibit corrosion and wear throughout the process. Fourier-Transform Infrared Spectroscopy (FTIR) analysis revealed prominent peaks of functional groups in these bio-lubricants; esters (C-O) and (C=O), alkanes (C-H), hydroxide (O-H), and nitrile groups deposited on the cutting tool surface. Initially, nitrile group is detected on cutting tool surface without lubricants at 2200 to 2300 absorption band reduced to lower intensity and most likely concealed by MJO+AIL10% compared to MJO+PIL1% where the nitrile group remains reflected in FTIR spectrum. In this work, it is proved that MJO+AIL10% has higher viscosity as compared to MJO+PIL1%. in the context of functional groups and supported the previous study on MJO+AIL10% as corrosion inhibitor.
Late recurrence of a giant left ventricular pseudoaneurysm: the importance of multimodality imaging approach
Authors: Landi Antonio , Andres Anto Luigi , Napodano Massimo
Published: March 2020

Left ventricular pseudoaneurysms (LVP) are rare but may arise after myocardial infarction, trauma or cardiac surgery, tending to expand and rupture over the time. We show the case of a 75-year-old patient with a recurrent giant ventricular pseudoaneurysm, who presented to the emergency department with sustained ventricular tachycardia. Pseudoaneurysmatic lesion was investigated through echocardiography, angiography and Cardiac Computed Tomography, in order to evaluate the size and spatial orientation of the pseudoaneurysm and to set a tailored treatment. At emergency department, sustained ventricular tachycardia may be the first and unique clinical presentation of ventricular pseudoaneurysm late recurrence, whose management requires a multimodality imaging approach to guide surgical correction.
Sexual Dysfunction and its Related Factors Among Pregnant Women Referred to Health Centers in Qazvin, Iran
Authors: Hajnasiri Hamideh , Moafi Farnoosh , Nami Masomeh , Safaralinezhad Atefeh
Published: March 2020

Introduction:

Sexual function is a part of human life and behavior. It is considered a multidimensional phenomenon that it is influenced by various biological, psychological, and social factors. Pregnancy plays an important role in female sexual function and behavior. This study was conducted to investigate the sexual function and to determine the prevalence of sexual dysfunction among pregnant women during the trimesters of pregnancy.

Methods:

This study is a cross-sectional study conducted in 2016 on 150 pregnant women who referred to the health centers affiliated to Qazvin University of Medical Sciences, in Qazvin. Samples were recruited through convenience sampling. For data collection, a personal and midwifery characteristics checklist, the Female Sexual Function Index, and Depression Anxiety, Stress scales were used. Collected data were then analyzed using SPSS using descriptive statistics, one-way ANOVA, and univariate and multivariate regression models. P < 0.05 was considered statistically significant for all tests.

Results:

Thirty-three percent of pregnant women suffered from sexual dysfunction. The mean and standard deviation of the female sexual function score were 44.7 ± 26.11. Sexual dysfunction among pregnant women during the first, second, and third trimesters were 2%, 20%, and 78%, respectively. Sexual function was correlated with gestational age (P < 0.05); however, the mean sexual function score was lower during the third trimester. There was also a significant relationship between sexual function with the mother's age and education.

Conclusion:

The prevalence of sexual dysfunction during pregnancy was high. Therefore, pregnant women and their spouses need counseling on the physical and mental changes during pregnancy.