bluuebunny/crossref_metadata_2025 huggingface dataset:
The Comparison between Free Thyroxine and Thyroid-Stimulating Hormone Levels on Melasma Severity: A Cross-Sectional Study
Authors: Rahman Yusnita , Krisanti Roro Inge Ade , Wisnu Wismandari , Sitohang Irma Bernadette S.
Published: June 2021

Background: Melasma has been suspected to be linked with levels of thyroid hormone. There is no study that explains the association between thyroid hormone level with melasma severity. Objective: This study aims to find the discrepancies in the levels of thyroid hormone in varying severity of melasma by using two different measurement techniques. Methods: Subjects were chosen consecutively from the dermatology clinic at RSUPN Dr. Cipto Mangunkusomo hospital. Forty-eight patients participated in this study were categorized into mild melasma and moderate-severe melasma based on modified melasma area and severity index (mMASI) and Janus II measurement. Results: Statistically, mMASI measurement showed no significant association between varying melasma severity with levels of thyroid stimulating hormone and free T4 (FT4), P 0.375 and P 0.208, respectively. The Janus II examination using polarized light modality has a weak positive correlation with the serum FT4 level (r=0.3; P 0.039). Weak correlation was also found between the two measurement strategies, Janus II and mMASI (r= 0.314; P 0.03). Conclusion: There are no significant differences observed in levels of thyroid hormone between subjects with varying degrees of melasma severity.
Brine Shrimp (Artemia salina Leach.) Lethality Test of Ethanolic Extract from Green Betel (Piper betle Linn.) and Red Betel (Piper crocatum Ruiz and Pav.) through the Soxhletation Method for Cytotoxicity Test
Authors: Nerdy Nerdy , Lestari Puji , Sinaga Jon Piter , Ginting Selamat , Zebua Nilsya Febrika , Mierza Vriezka , Bakri Tedy Kurniawan
Published: June 2021

Traditional medicine is currently being explored and developed widely by various countries because its cost effectiveness and reduced side effects. The green betel (Piper betle Linn.) and the red betel (Piper crocatum Ruiz and Pav.) are plants from the same Piper genus that are widely cultivated in Indonesia and have various phytochemical properties and pharmacological effects. The objective of this research is to determine the cytotoxicity of green leaves and red betel leaves. This research was conducted in two main stages: first, the extraction and preparation through the soxhletation method; second, a cytotoxicity test through the brine shrimp (Artemia salina Leach) lethality test (BSLT). The results showed that there were lethal concentration 50 % (LC50) value in both green betel leaves ethanolic extract and red betel leaves ethanolic extract, with 44.975 μg per mL and 31.556 μg per mL, respectively. The red betel (leaves ethanolic extract has a higher cytotoxicity than green betel (leaves ethanolic extract which can be seen from the lower lethal concentration of 50% (LC50) value. The difference in cytotoxicity is due to differences in plant varieties that cause variations in phytochemical content which affects the pharmacological effects. The green betel leaves ethanolic extract and the red betel leaves ethanolic extract are cytotoxic and have potential anticancer properties.
The Effect of Mango Mistletoes (Dendrophthoe pentandra) Leaves Extract on Percentage of CD4+CD28+, CD8+CD28+, and interleukin-2 Levels of Aged Balb/c Mice
Authors: Handono Kusworini , Pratama Mirza Zaka , Sermoati Inmas Andi , Yuniati Maria Gabriela , Haryati Ni Putu Sri , Norahmawati Eviana , Endharti Agustina Tri , Irwanto Yahya , Solikhin Muhammad Badrus , Hidayat Syaiful
Published: June 2021

BACKGROUND: Population aging is considered to be a global phenomenon today. Age-associated immune system dysfunction or “immunosenescence” is indicated by increased susceptibility to infections and chronic diseases, such as hypertension, diabetes mellitus, autoimmune diseases, heart disease, and atherosclerosis. One of the immunosenescence markers is a significant drop in CD28 and reduced proinflammatory cytokine interleukin-2 (IL-2). The mango mistletoes are deemed to have a better affinity for docking the CD28 and IL-2R receptors of α and β subunits than other plants.

AIM: This study aims to determine the effect of ethanol extract of mango mistletoes on IL-2 levels, the percentage of CD4+CD28+, and the percentage of CD8+CD28+ in aged female mice.

METHODS: The leaves of mango mistletoes were extracted using 96% ethanol solvent, and the extract was administered to aged female mice (18–20 months) orally with different doses for each group, namely 150, 300, and 600 mg/kg. Mango mistletoe leaves extract was administered once a day for 14 days. Then, the IL-2 levels of the mice were checked from their heart blood samples using Enzyme-Linked Immunosorbent Assay, while the percentages of CD4+CD28+ and CD8+CD28+ were examined from the spleen samples using flow cytometry.

RESULTS: The ethanol extract of mango mistletoe leaves was able to increase the percentage of CD4+CD28+ significantly (p < 0.05) at doses of 300 and 600 mg/kg and increase the percentage of CD8+CD28+ significantly (p < 0.05) at a dose of 600 mg/kgBW, while other various doses had a strong enough correlation (r = 0.48) to increase IL-2 levels.

CONCLUSION: The ethanol extract of mango mistletoe leaves has the good potential to inhibit the aging process in the immune system, as characterized by an increase in IL-2 levels and the percentage of CD4+CD28+ and CD8+CD28+.
Physicochemical Characteristics of Chicken Eggshell Flour Produced by Hydrochloric Acid and Acetic Acid Extraction
Authors: Rosnah Rosnah , Taslim Nurpudji A. , Aman Andi Makbul , Idris Irfan , As’ad Suryani , Bukhari Agussalim , Wahyudin Elly
Published: June 2021

Backgrdound: Several previous researchers have prepared chicken eggshell flour using hydrochloric acid (HCl) and acetic acid (CH3COOH) solvents. However, the results of the physicochemical characteristics still very diverse. This study aims to produce chicken eggshell flour using two different types of solvents (4% HCl and CH3COOH 2N) and determine the proper solvent to obtain better physicochemical characteristics.
Method: This type of research was descriptive quantitative. The research stages initiated by preparing chicken eggshell samples by maceration using 4% HCl and CH3COOH 2N. Afterward, chemical characteristics (moisture content, ash, calcium carbonate, calcium, and phosphorus) and physical characteristics (yield) of eggshell flour were determined. Processing and data conducted by using the IBM SPSS statistic program
Result: The higher levels of calcium, calcium carbonate, phosphorus, ash, yield, and lower water content of the eggshell powder were generated by extraction using 4% HCl than 2N acetic acid (CH3COOH).
Conclusion: The physicochemical characteristics of the eggshell powder extracted from the 4% HCl were better than the 2N acetic acid (CH3COOH)
The Impact of the Coronavirus Disease-19 Pandemic on Sexual Behavior of Marriage People in Indonesia
Authors: Tribowo Jefry Albari , Tanojo Tjahjo Djojo , Supardi Supardi , Pakpahan Cennikon , Siswidiyanto Eko Budi , Rezano Andri , I’tishom Reny
Published: June 2021

BACKGROUND: The coronavirus disease (COVID-19) pandemic has been a global challenge since its first encounter. It has changed the daily lives of families including the sexual behavior of couples due to public health concerns and government policy to restrict people’s movement. It has changed both interpersonal and partner relationships; the time availability at home, the continued presence of children at home, the fear of infection, and the inability to physically interact with others have changed most people’s sexual behavior.

AIM: This study aims to evaluate sexual behavior changes in marriage people of Indonesia during the COVID-19 pandemic.

METHODS: A cross-sectional online study was conducted, using self-constructed questionnaires. The convenience sample was collected from married males and females for at least 10 months from November 2020 to January 2021. The participants were asked 19 and 20 questions for female and male, respectively, which was an adaptation of the previous questionnaires. Furthermore, a study was conducted to analyze descriptively the changes of sexuality among married people before and during the COVID-19 pandemic.

RESULTS: About 201 participants who completed the survey, 110 males (54.7%) and 91 females (45.3%) were included in the analyses. The mean age of participants was 37 years old. Most of the participants have middle to high socio-economy classes and have children at home. Shifting in the work schedule is the main reason to change sexual behaviors. Participants experienced significant changes in sexual behaviors and some sexual responses before and during the restriction time.

CONCLUSION: The pandemic has changed sexual behaviors due to social restrictions in Indonesia. These findings imply messages about the consequences of the pandemic on sexual behaviors that may affect the sexual relationship, marriage stability, and physical health itself to fight coronavirus.
Phytosociology of Atractylis cancellata and Micromeria microphylla communities in southern Italy with insights on the xerothermic steno-Mediterranean grasslands high-rank syntaxa
Authors: Di Pietro Romeo , Fortini Paola , Misano Giuseppe , Terzi Massimo
Published: June 2021

In the present paper a phytosociological study on the dry grassland communities identified in the western sector of the Murgia Plateau (Murgia delle Gravine) and in the Lucanian badlands territory is presented. Forty vegetation releves were carried out using the Braun-Blanquet phytosociological approach. Two new associations characterized by a therophytic dominance, namely Lysimachio foeminae-Atractylidetum cancellatae and Campanulo erini-Micromerietum microphyllae, are described and discussed from a syntaxonomic and biogeographic viewpoint. In addition, new phytosociological data concerning the Petrosedum ochroleucum communities developed on limestone outcrops, the perennial Hyparrhenia hirta steppe-like grasslands of the low-altitude areas of the Murgia hills and the small-size Brachypodium distachyum therophytic communities are presented.
The fauna of Geometrid moths of the Natural Forest Reserve “Cobîleni” Republic of Moldova – Preliminary data
Authors: Țugulea Cristina , Mocreac Nadejda , Țugulea Adrian
Published: June 2021

Cobîleni Natural Forest Reserve with a surface of 33.5 ha is situated near Lopatna village, Orhei district, on the right bank of the Dniester River. The aim of the study was to assess the geometrid moths (Lepidoptera, Geometridae) fauna from this reserve. The most part of entomological materials from Cobîleni Natural Forest Reserve discussed in this paper were collected at the light trap during vegetation period of 2018. In the paper the list of fifty-five geometrids species is given, also their geographical distribution, ecological and trophic structure. The geometridae species collected from this reserve belong to five subfamilies. Most of the captured specimens belong to the Ennominae subfamily with 36 species, as it is typical for mesophilous meadows, followed by Sterrhinae with nine species, then Larentiinae with eight, and finally Orthostixinae and Geometrinae with only one species each. In the result of establishing of taxonomic affiliation of the entomological material collected during 2018, a new geometrid species for the fauna of the Republic of Moldova was identified: Cyclophora linearia.
Vespa orientalis, a new alien species in Romania
Authors: Zachi Mihai , Ruicănescu Adrian
Published: June 2021

A new alien hornet species (Vespa orientalis) has been observed in the Northern part of Bucharest, Romania, and reported through to the social networking platform for naturalists and citizen scientists, iNaturalist. All records were taken in Bucharest during 2019 and 2020.
First record of Phyllolabis savtshenkoi (Diptera, Limoniidae) in Morocco
Authors: Taybi Abdelkhaleq Fouzi , Mabrouki Youness , Keresztes Lujza
Published: June 2021

In this paper, we provide the first record of Phyllolabis savtshenkoi in Morocco previously known only from Spain and the Canary Islands. In addition, Dicranomyia goritiensis and Geranomyia caloptera are recorded for the first time in the oriental region of Morocco.
First finding of a fossilized Cantharidae (Insecta: Coleoptera) from the Middle Miocene deposits in Romania
Authors: Pintilioaie Alexandru-Mihai , Fanti Fabrizio , Ionesi Viorel
Published: June 2021

The extraordinary fossil sites of Vlădiceni (Iaşi, Romania) recently discovered, with lithostratigraphy of Middle Miocene age, have uncovered a rich fauna especially of fishes, molluscs, amphipods and insects. This includes also the first fossil specimen of family Cantharidae from both this geological formation and from Romania: Malthodes (Malthodes) vladiceniensis sp. nov., which is illustrated and described and compared with living and fossil species of the genus.
First record of the alien mantid Hierodula tenuidentata (Insecta: Mantodea) in Romania
Authors: Pintilioaie Alexandru-Mihai , Spaseni Petronel , Jurjescu Ana , Rădac Ioan Alexandru
Published: June 2021

Hierodula tenuidentata is reported for the first time in Romania, from several places, with strong evidence on the existence of stable populations in this country. Preliminary data regarding the ecology of the species and its relations with indigenous fauna are presented, as well as differences between this species and its closest congeners from Romania and Europe.
Alien fish, amphibian and reptile species in Romania and their invasive status: a review with new data
Authors: Iftime Alexandru , Iftime Oana
Published: June 2021

The paper presents a review of literature data, supplemented with original observations, on the presence, establishment, distribution and invasive status of alien fish, amphibian and reptile species in Romania. Consistent criteria were followed in defining alien species records, establishment and invasive status. From the 48 alien fish species, 1 fish hybrid, 1 amphibian and 18 reptile species recorded, only 16 fishes and 3 reptiles can be regarded as established. Of these we consider the criteria for invasive status as being probably fulfilled by one fish species (Perccottus glenii), and less likely by six more fish species. The presence and the alien status of the one amphibian are debatable. No reptile species can be considered invasive at present.
La crise du logement comme enjeu en période de décolonisation : le cas de la ville de Bône en Algérie (1945-1962)
Authors: Rezgui Ibtissem , Boufenara Khedidja , Taliano-des Garets Françoise
Published: June 2021

La crise du logement au lendemain de la Seconde Guerre mondiale en Algérie coloniale est un problème d’ordre social et urbain qui a profondément marqué ce territoire jusqu’à son indépendance. Le présent article s’intéresse au cas de la ville de Bône (Annaba, ) dans l’Est algérien pour répondre aux différents questionnements qui gravitent autour de ce problème. Il tend en premier lieu à mettre en lumière les facteurs d’apparition de la crise du logement, il examine ensuite les acteurs, leurs mobiles et leur engagement en faveur de la construction du logement social en Algérie et à Bône en particulier. Il traite enfin les résultats de la politique menée en matière de logement et la gestion différenciée des populations marquée par les formes architecturales employées.
Différences de mortalité par Covid-19 : conséquence des imperfections et de la diversité des systèmes de collecte des données
Authors: Garcia Jenny , Torres Catalina , Barbieri Magali , Camarda Carlo-Giovanni , Cambois Emmanuelle , Caporali Arianna , Meslé France , Poniakina Svitlana , Robine Jean-Marie , Guerrouche Karine
Published: June 2021

L’urgence que représente la compréhension de la pandémie de Covid-19 a entraîné des différences considérables entre les procédures de collecte des données des pays concernés, qui s’efforcent tous de produire des informations en temps réel mais qui restent des statistiques de mortalité imparfaites. Pour remédier à ce problème, l’analyse porte sur les décomptes de décès par Covid-19 provenant de la base de données « La démographie des décès par Covid-19 » ( https://dc-covid.site.ined.fr/fr/ ) ainsi que leurs limites. Cet article souligne des aspects importants touchant aux données qui limitent la possibilité de mener des comparaisons internationales. Pour pallier ces difficultés, les sources sont classées en fonction du caractère exhaustif de leurs données, puis les décomptes de décès sont analysés et comparés pour 16 pays. Bien comprendre les caractéristiques de la collecte des données est fondamental pour le traitement des statistiques imparfaites.
Lacticaseibacillus rhamnosus GG and Saccharomyces cerevisiae boulardii supplementation exert protective effects on human gut microbiome following antibiotic administration in vitro
Authors: Duysburgh C. , Van den Abbeele P. , Morera M. , Marzorati M.
Published: June 2021

Antibiotic-induced dysbiosis of the microbial community has been associated with several gastrointestinal symptoms. The impact of repeated administration of Lacticaseibacillus rhamnosus GG (CNCM-I-4798) (formerly known as Lactobacillus rhamnosus GG), Saccharomyces cerevisiae boulardii (CNCM-I-1079) and their combination (associated in Smebiocta/Smectaflora Protect®) in supporting recovery of gut microbiota functionality and composition during and following amoxicillin:clavulanic acid administration was evaluated in vitro. Antibiotic dosage negatively affected SCFA production, coinciding with detrimental effects on Bacteroidetes, Firmicutes and Bifidobacterium spp. in the simulated proximal colon, while Akkermansia muciniphila was significantly reduced in the distal colon. L. rhamnosus GG and S. boulardii were able to thrive in both colon regions upon dosing, with S. boulardii even showing protective effects on the survival of L. rhamnosus GG during antibiotic administration. The impact of the probiotic strains on microbiome recovery revealed that supplementation with L. rhamnosus GG and/or S. boulardii resulted in a stimulating effect on the most abundant bacterial groups within the bacterial community of each donor. For one of the donors tested, co-dosing of L. rhamnosus GG and S. boulardii resulted in superior short-chain fatty acid recovery accompanied by a stronger increase in abundance of Bifidobacteriaceae. Overall, the current study provides first evidence that combined supplementation of L. rhamnosus GG and S. boulardii might be an interesting candidate in limiting detrimental effects of amoxicillin:clavulanic acid on the human gut microbiome, though further studies are warranted to confirm these findings.
Cannabidiol (CBD) Use by Older Adults for Acute and Chronic Pain
Authors: Porter Brooke , Marie Barbara St. , Milavetz Gary , Herr Keela
Published: June 2021

Legalization of cannabidiol (CBD) products has ignited interest in clinical practice and research. One desired indication includes possible pain-relieving effects of CBD. The purposes of the current article are to (1) clarify terminology relevant to cannabinoids; (2) explain and understand the pharmacotherapeutics of CBD; (3) examine research of the current use of CBD by older adults for treating pain; (4) discuss safety considerations with using CBD products; and (5) provide best practice recommendations for clinicians as they advise their older adult patients. A review of the literature demonstrated mixed results on the efficacy of CBD in relieving pain in older adults. There is inconsistency in the labeling of over-the-counter CBD products that can result in safety issues and will require more federal quality control. Likewise, gaps in knowledge regarding safety and efficacy of CBD use in older adults are vast and require further research. [
Journal of Gerontological Nursing, 47
(7), 6–15.]
Maximum principle for discrete-time stochastic optimal control problem and stochastic game
Authors: Wu Zhen , Zhang Feng
Published: June 2021

This paper is first concerned with one kind of discrete-time stochastic optimal control problem with convex control domains, for which necessary condition in the form of Pontryagin's maximum principle and sufficient condition of optimality are derived. The results are then extended to two kinds of discrete-time stochastic games. Two illustrative examples are studied, for which the explicit optimal strategies are given. This paper establishes a rigorous version of discrete-time stochastic maximum principle in a clear and concise way and paves a road for further related topics.
Photoluminescence properties of GaAsBi single quantum wells with 10% of Bi
Authors: Dudutienė Evelina , Jasinskas Algirdas , Čechavičius Bronislovas , Nedzinskas Ramūnas , Jokubauskaitė Monika , Bičiūnas Andrius , Bukauskas Virginijus , Valušis Gintaras , Butkutė Renata
Published: June 2021

A set of single quantum well (SQW) samples of GaAs1-xBix with x ~ 0.1 and p-doped GaAs barriers grown by molecular beam epitaxy was investigated by the temperature-dependent photoluminescence (PL) spectroscopy. Those GaAsBi SQW structures showed a high crystalline quality, a smooth surface and sharp interfaces between the layers and exhibited a high PL intensity and a lower than 100 meV PL linewidth of QW structures. Temperature dependence of the optical transition energy was S-shape-free for all investigated structures and it was weaker than that of GaAs. An analysis of the carrier recombination mechanism was also carried out indicating that the radiative recombination is dominant even at room temperature. Moreover, numerical calculations revealed that a higher Be doping concentration leads to an increased overlap of the electron and heavy hole wave functions and determines a higher PL intensity.
Sources of Infection Among Confirmed Cases of COVID-19 in Jeju Province, Korea
Authors: Hwang Moonkyong , Bae Jong-Myon
Published: June 2021

Objectives: Jeju Province in Korea reported 627 coronavirus disease 2019 (COVID-19) cases between January 20, 2020, and March 31, 2021. This study analyzed the sources of infection among confirmed cases in Jeju Province, a self-governed island.Methods: The sources of infection were broadly categorized as follows: (1) infections from overseas (confirmed patients who reported travel overseas or contact with overseas travelers); (2) infections from outside Jeju Province (confirmed patients who had visited other provinces or had contact with individuals who had traveled to other provinces in Korea); and (3) unknown sources of infection (confirmed patients who were infected following contact with an infected person whose source of infection was unknown). The chi-square test was used to analyze the differences in the distributions of related variables for each source of infection.Results: Of the 627 confirmed cases, 38 (6.1%) were infections from overseas sources, 199 (31.7%) were from outside of Jeju Province, and 390 (62.2%) were from unknown sources. Jeju Province had no cases with an unknown source of infection during the first and second waves of the nationwide outbreak.Conclusions: Infections from overseas sources could be blocked from spreading to local communities in Jeju Province by conducting screening at the airport, along with the preemptive suspension of visa-free entry. In addition, considering the scale of the nationwide outbreak, measures must be established to delay outbreaks from unknown sources of infection caused by sources outside Jeju Province.
Geografía médica de Degaña (1913): territorio, pobreza y salubridad
Authors: Vallina Rodríguez Alejandro , Aguilar Cuesta Ángel Ignacio , García Juan Laura
Published: June 2021

La presente investigación ahonda en el tratamiento integral de fuentes geohistóricas textuales, impulsando los procedimientos que en la actualidad abogan por la recuperación, análisis y apertura del conocimiento científico de forma abierta y extensiva a la sociedad. Entre mediados del siglo XVIII y mediados del XX se elaboran en España más de cuatrocientas obras médicas (geografías o topografías médicas), al socaire de la generalización de las teorías higienistas en el urbanismo y la sociedad en su conjunto. Estas ediciones, bien estudiadas y conocidas, constituyen unas colecciones de información y documentación enormemente valiosa para el conocimiento de los espacios, urbanos y rurales, de la época.
Así, la información contenida en la Geografía médica de Degaña, de 1913, se utilizará como base para el análisis de la información que, a escala geográfica, aporta esta tipología documental, estableciendo una metodología para la extracción de información geográfica contenida en los documentos de principios del siglo XX. Este proyecto busca optimizar el uso de fuentes secundarias de conocimiento sobre el territorio, teniendo en cuenta la variedad y cantidad de información que se puede extraer de ellos. Con el uso de fuentes secundarias de información, se abren nuevas oportunidades y estrategias para abordar problemas territoriales desde los amplios campos de la geografía histórica, la humana y la geografía regional.
Internet-of-Things for Smart Street Lighting System using ESP8266 on Mesh Network
Authors: Fuada Syifaul , Adiono Trio , Siregar Lindawani
Published: June 2021

IoT concept gained tremendous momentum in this century's technological advancements because it has efficiently connected various devices wirelessly. The ESP8266 Wi-Fi serial transceiver module is one of the most used devices for IoT applications. This paper designs the IoT-based smart street lighting system using ESP8266 configured as a Mesh network. The ESP8266 was instructed (programmed) to control the light level by producing a PWM signal, then it sends a dimmer value and reads the sensor's data. We can access our system wirelessly via a web server. The overall system was successful as a smart street lighting system in a wireless Mesh environment. This research result is also compared to the existing similar project in terms of the system complexity aspect.
Perfect fluid model with g = 2
Authors: French John
Published: June 2021

A perfect fluid model with a shell of charge is presented which yields g = 2 for low angular velocity. This model is not intended to represent a classical model of the electron but to show that a simple model based on equations consistent with special relativity
can yield a value of g = 2.
Wear Behavior of Ceramic-Metal Composites as Tool Material for FSW of Copper
Authors: Kolnes Mart , Kübarsepp Jakob , Sergejev Fjodor , Kolnes Märt , Tarraste Marek , Viljus Mart
Published: June 2021

Friction stir welding (FSW) is employed primarily for metals characterized by poor weldability at fusion welding: aluminium, magnesium, titanium and copper alloys as well as stainless steels. The focus of the study was on the feasibility of application of WC-based hardmetal 85WC-Co and TiC-based cermet 80TiC-NiMo as potential tool materials for FSW of copper. The single-pass welding trials of Cu sheets were performed using a vertical milling machine. For better understanding of interactions between the tool and workpiece at welding temperature EDS line scans across the interfaces tool-workpiece after welding as well as after diffusion tests were performed. It was concluded that both tested ceramic-metal composites did not failure during multiple plunges and during the total transverse welding distance of 10 m. Also, significant tool wear was not observed after such a welding distance. The possibility of producing visually defect-free welds using tools from WC- and TiC- based ceramic-metal composites was proved and also mutual diffusion of elements across the interface tool-workpiece was discussed.
An Effectiveness Improvement of the Pultrusion Process for a Production of Thin-Walled Rectangular Profile
Authors: Namsone Endija , Arshanitsa Alexandr
Published: June 2021

For an effectiveness improvement of conventional pultrusion processes, new optimization methodology is developed by using the design of experiments and response surface technique. An application of this methodology with two objective functions describing the minimum electrical energy spent for a curing and maximum pull speed is successfully demonstrated for the pultrusion process producing thin-walled-rectangular profile.
Hybrid Pigments Based on Montmorillonite and Anionic Dyes for Leather Finishing
Authors: Bondaryeva Anna , Mokrousova Olena , Okhmat Olena
Published: June 2021

The work is focused on obtaining hybrid pigments by adsorption of anionic dyes on positively charged montmorillonite. Modification of the sodium form of montmorillonite by chromium hydroxocomplexes was provided to ensure effective adsorption of anionic dyes on the surface of mineral particles. A high level of adsorption of anionic dyes as a result of steric factor was revealed. It was shown that the adsorption of dyes depended on the pH of the medium and was characterized by a maximum level at pH 4.5 – 6.0. The scheme of obtaining hybrid pigments, which were characterized by good сovering ability, resistance to stratification, especially saturated and intense colour was proposed.
Microstructure and Oxidation Resistance of Thermal Barrier Coatings with Different Ceramic Layer
Authors: Góral Marek , Kubaszek Tadeusz , Kościelniak Barbara , Drajewicz Marcin , Gajewski Mateusz
Published: June 2021

Thermal barrier coatings are widely used for protection of gas turbine parts against high temperature oxidation and hot corrosion. In present work the microstructural assessment of TBCs produced by atmospheric plasma spray (APS) method was conducted. Three types of ceramic powders were used: magnesia- stabilized zirconia oxide (Metco 210), yttria stabilized zirconia oxide (YSZ -Metco 204) and fine-grained YSZ – Metco 6700. As a base material the Inconel 713 was used as well and CoNiCrAlY was plasma sprayed (APS) as a bond coat. The thickness of all ceramic layers was in range 80 – 110 μm. The elemental mapping of cross-section of magnesia-stabilized zirconia showed the presence of Mg, Zr and O in outer layer. In the YSZ ceramic layer the Y, Zr and O were observed during elemental mapping. The isothermal oxidation test was conducted at 1100 °C for 500 h in static laboratory air. On all samples the delamination and spallation of ceramic layers was observed. Chemical composition analysis of coatings showed the presence of two areas: the first one contained elements from bond coats: Ni, Cr, Al, Co and second area contained O, Cr Co and O that suggest the scale formation. The obtained results showed the total degradation of all ceramic layers as a result of internal stresses in bond-coat. Microscopic analysis showed the areas with complete degradation of bond coats and formation of thick oxides layer.
The Influence of Process Parameters on Structure and Phase Composition of Boride Coatings Obtained on X39CrMo17-1 Stainless Steel
Authors: Drajewicz Marcin , Góral Marek , Kościelniak Barbara , Ochał Kamil , Kubaszek Tadeusz , Pytel Maciej , Wierzba Patrycja , Wojtynek Robert
Published: June 2021

The boride coatings are characterized by attractive set of properties: high wear resistance and good high-temperature corrosion. In present research the diffusion boride coatings were obtained on X39CrMo17-1 stainless steel. The pack-boriding process was conducted using commercial Ekabor 2 powder. The influence of time of process on thickness and chemical composition was analysed. The boriding process was conducted in 2, 4, 6 hours at 1000 °C using retort furnace. The obtained coating was characterized by double layer structure and contained the FeB in outer layer and Fe2B in inner layer. The thickness of boride coatings increased with process time. The analysis of obtained results showed that the optimal thickness of coating was obtained during 4-h pack boriding.
Determining High-Temperature Oxidation Resistance of (TI-Al-X-N) Based Coatings for Titanium Alloys
Authors: Savkovs Konstantins , Urbaha Margarita , Feofanovs Viktors
Published: June 2021

Basic titanium alloys are successfully used in modern aviation GTE (gas turbine engine). They are used for parts of a compressor and partly in low pressure part of turbine (intermetallic Ti-Al alloys) due to their high specific strength and at the same time low density, high corrosion resistance but can be used only up to 700 °C. The paper deals with the results of heat resistance testing at 750 °C of Ti-Al-(X)+N based thin ion-plasm multilayers coatings, with different priority of monolayers- intermetallic, conglomerate or nitride for gas turbine engine (GTE) blades from titanium alloys. All coatings showed high resistance during the test, with a maximum efficiency 42.8 of coating with a priority of conglomerate after 30 hours of testing.
Urinary symptoms and urodynamic findings before and after vaginal surgery for pelvic organ prolapse
Authors: Srikureja Narisra , Hengrasmee Pattaya , Leerasiri Pichai , Asumpinwong Chutimon
Published: June 2021

To ascertain the difference in urodynamic findings, specifically bladder sensation, and urinary symptoms after vaginal surgery for Pelvic Organ Prolapse (POP). Retrospective data analysis of 126 women who underwent vaginal surgery for POP without simultaneous anti-incontinence procedure from January 2013 to April 2019 at Siriraj Hospital, Thailand. Baseline characteristics, intraoperative details and pre and post-operative urinary symptoms and urodynamic findings were recorded. There was no significant difference in the pre and post-operative first desire to void, at 158±53 mL and 162±64 mL, respectively (p=0.518). Incidence of increased bladder sensation was also unchanged, from 46.0% to 46.8% (p=1.00). Post-operative urodynamic stress incontinence was significantly increased, from 15.9% to 31.0% (p=0.003), as was the incidence of weak bladder contractility index (<100), from 47.3% to 61.8% (p=0.005). Significant improvements in post-operative urge urinary incontinence, urgency and voiding dysfunction were noted, from 50.8% to 31.7% (p=0.001), 63.5% to 38.9% (p<0.001) and 42.9% to 5.6% (p<0.001), respectively. No significant difference in bladder sensation after vaginal surgery for POP repair was noted. However, urinary symptoms significantly improved after surgery.
A preliminary mine stability assessment at Dumagami Mine, Quebec
Authors: Yu Y S , Toews N A , Boyle R , Bétournay M
Published: June 2021

Using the three-dimensional finite element analysis technique, a preliminary mine stability assessment of the Dumagami mine, Quebec, was carried out. As expected the mining of stopes based on the mine plan for the years 1990/2000, will induce very high stresses
at the lower level of the mine. The strength of hangingwall and footwall formations are weak and they will not be able to withstand high stresses resulting from stoping. In addition, large areas of tension in both hangingwall and footwall will, develop, and subsequently, this would cause ground
instability and produce high a degree of dilution.
A coordinated mine plan, if possible, with the neighbouring Bousquet, is considered essential for maintaining the structural integrity of both mines. A strategic field monitoring program should be developed and implemented as soon as possible. Alternative mine plans should be developed with the
assistance of model studies, and to establish a favourable mining sequence.
A preliminary report on magnitude scaling of mining induced seismicity at Kirkland Lake
Authors: Plouffe M
Published: June 2021

In Canada, magnitude of large seismic events are determined using the measured amplitude of the S-phases recorded by the National Seismograph Network (NSN). Since late 1980's, the Rockburst Project operates a seismograph station at Kirkland Lake in order to
calibrate the magnitude of the mining induced seismic events originating from the local mines.
However, no magnitude values can be deduced for small events originating the area using the NSN stations because of the distance existing between Kirkland Lake and the closest stations. In order to extend the magnitude scales for these smaller events, a local magnitude scale based I on the national
scale was developed using the data recorded by the regional Kirkland Lake seismograph station.
The local magnitude scale was developed for the Macassa Mine, Lac Minerals Ltd., the only seismically active mine presently in operation in the area. This procedure would allow the determination of the magnitude values for this mine down an equivalent Nuttli magnitude to less than 1.0 instead of the
previous lower threshold of 1.8.
Intravitreal anti-vascular endothelial growth factor therapy for choroidal neovascularization secondary to laser pointer injury in a child
Authors: Llavero-Valero Pilar , Morillo-Sánchez María J , Domínguez-Serrano Borja , Gómez-Escobar Antonio José , Gutiérrez-Sánchez Estanislao , de la Rúa Franch Enrique Rodríguez
Published: June 2021

Laser pointers are readily available and are often labeled as toys. A 12-year-old girl was brought to the emergency department complaining of a central scotoma in the right eye after being exposed to a laser pointer. Fundus examination revealed severe maculopathy in both eyes. Optical coherence tomography angiography and fundus angiography examinations revealed choroidal neovascularization in the area of the laser injury in the right eye. One intravitreal anti-VEGF injection was administered in the right eye, resulting in good clinical and structural responses. Intravitreal anti-VEGF may be effective for improving visual outcomes in laser pointer-induced maculopathy complicated with choroidal neovascularization.
Rare case of arterioportal fistula in a Nigerian; Presentation and successful management with transcatheter arterial embolization
Authors: Ninalowo Hammed , Oluyemi Aderemi , Iwuchukwu Chijioke Chris , Olushekun Abdul Hamid
Published: June 2021

Arterioportal fistula (APF) is a rare and potentially fatal cause of portal hypertension. In this case report, we present an unwonted case of a Nigerian with this disorder. As well, this article documents details of successful therapy for such a large APF with transcatheter arterial embolization which was carried out locally. This study is thus a first-of-its-kind for our African subregion. We hope that this article will help to highlight the role and significance interventional radiology services and expertise in an emerging health-care system as the one seen in West Africa – particularly as it relates to its benefits in the field of hepatology.
In Silico Prediction of Molecular Interaction Within PmCBP-VP24 Complex to Understand Initial Instigation of WSSV into Shrimps
Authors: Yadav Kanika , Verma Arunima Kumar , Pathak Ajey Kumar , Awasthi Abhishek
Published: June 2021

White Spot Disease is one of the most devastating diseases of shrimps. Molecular interaction between shrimp receptor protein PmCBP (Chitin binding protein of Peneaus monodon) and viral envelop protein VP24 is obligatory for binding of the White Spot Syndrome Virus to the shrimp digestive tract, and failure of this anchoring leads to an ineffectual infection. This is a first study that throws light on the molecular interaction of PmCBP-VP24 complex and provides important clues for initial steps of ingression of the virus into shrimps.
Теорема типа Сильвестра-Галлаи для абелевых групп
Authors: Nilov Fedor Konstantinovich , Polyanskii Alexandr Andreevich
Published: June 2021

Конечное подмножество $X$ абелевой группы $A$ по сложению
называется множеством Сильвестра-Галлаи типа $m$,
если $|X|\geqslant m$ и для любых различных
$x_1,…,x_{m-1} \in X$ найдется элемент
$x_m \in X \setminus \{x_1,…,x_{m-1}\}$ такой,
что
$$
x_1+…+x_m=o_A,
$$
где через $o_A$ обозначен нуль группы $A$.
Мы опишем все множества Сильвестра-Галлаи типа $m$.
В качестве следствия получим следующий результат:
если $Y$ - конечное множество точек, лежащих на эллиптической кривой
в $\mathbb P^2(\mathbb C)$, и
(A) для любых двух различных точек $x_1,x_2 \in Y$ найдется точка
$x_3 \in Y \setminus \{x_1,x_2\}$, коллинеарная $x_1$ и $x_2$,
то либо $Y$ - это конфигурация Гессе эллиптической кривой,
либо $Y$ состоит из трех точек, лежащих на одной прямой;
(Б) для любых пяти различных точек $x_1,…,x_5 \in Y$ найдется
точка $x_6 \in Y \setminus \{x_1,…,x_{5}\}$ такая,
что $x_1,…,x_6$ лежат на одной конике, то $Y$ состоит
из шести точек, лежащих на одной конике.
Библиография: 13 названий.
Точные неравенства для рациональных функций на окружности
Authors: Dubinin Vladimir Nikolaevich
Published: June 2021

Для рациональных функций с предписанными полюсами,
лежащими вне единичной окружности $|z|=1$,
устанавливаются точные неравенства в точках $z$, $|z|=1$.
В отличие от известных результатов допускается расположение
указанных полюсов по разные стороны от окружности $|z|=1$.
Библиография: 20 названий.
Modern approaches to business management: theory and practice
Authors:   Mykhailo Tuhan-Baranovskyi Donetsk National University of Economics and Trade (Kryvyi Rih), Lina Кostakova , Olha Nikolaichuk , Svitlana Popova , Yevhenii Klievtsov
Published: June 2021

The collective monograph is a project of the Department of Technology in Restaurant Industry, Hotel and Restaurant Business and Entrepreneurship of Mykhailo Tuhan-Baranovskyi Donetsk National University of Economics and Trade. Some aspects of business management in modern conditions are considered: formation of production cost of mining and metallurgical enterprises, tendencies and prospects of development of the hospitality industry, quality management of services of hotel enterprises, formation and development of competitive advantages due to interaction of hotel and restaurant establishments. The monograph is targeted at scientists, decision-makers in the field of the development of strategy for the development of business structures in various areas of economic activity, teachers, postgraduates, masters and students of economics.
Rancangan Sistem Pengamanan Shelter DVOR di Bandar Udara Internasional Sam Ratulangi Manado
Authors: Rusman  , Safitri Rima
Published: June 2021

Dalam menunjang kelancaran operasional keselamatan penerbangan maka fasilitas penunjang keselamatan penerbangan perlu mendapat perawatan, pemeliharaan, serta pengawasan dan pengamanan yang mumpuni  terkhusus pada peralatan fasilitas alat bantu navigasi penerbangan yaitu DVOR (Doppler Very High Frequency Omni Directional Range) di Bandar Udara Internasional Sam Ratulangi Manado yang tidak memiliki pengamanan yang memadai. Tujuan perancangan ini adalah untuk menghasilkan rancangan sistem pengaman shelter DVOR agar pengawasan dan pengamanan shelter DVOR lebih efektif. Metode rancangan sistem pengaman ini menggunakan sebuah sensor gerak atau disebut sensor PIR (Passive Infrared Receiver) yang diintegrasikan dengan mikrokontroller. Apabila sensor PIR mendeteksi gerakan manusia maka akan memberi inputan ke mikrokontroller untuk diproses. Output dari mikrokontroller akan mengaktifkan alarm dan menampilkan informasi pada LCD (Liquid Crystal Display) serta mengirimkan perintah kepada modul WAVECOM untuk melakukan panggilan ke ponsel security. Setelah security menutup panggilan tersebut maka akan muncul notifikasi berupa SMS untuk mematikan atau tetap menghidupkan alarm hingga security tiba di lokasi shelter DVOR. Rancangan sistem pengaman ini dapat membantu security dalam pengawasan dari jarak jauh serta meningkatkan keamanan pada area sekitar shelter DVOR agar dapat memantau dan meminimalisir tindakan – tindakan kriminal di area sekitar shelter DVOR.Kata kunci : Rancangan, Sistem pengamanan, Shelter, DVOR
Simulasi Marker Beacon berbasis Mikrocontroller di Akademi Teknik dan Keselamatan Penerbangan Makassar
Authors: Atmia Kurniaty , Aswar A. Muh.
Published: June 2021

Simulasi marker beacon menggunakan mikrokontroler bertindak sebagai otak dari komponen dan Signal generator yang memberikan inputan berupa sinyal sinusoidal ke transmitter. Ketika transmitter mengirim informasi berupa sinyal tersebut kemudian akan diterima oleh receiver dan diteruskan ke speaker, sehingga dapat menghasilkan rancangan yang mensimulasikan prinsip kerja dari suatu peralatan marker beacon. Rancangan ini bertujuan untuk menghasilkan simulasi Marker Beacon Berbasis Mikrokotroller. Metode yang digunakan ialah Perancangan, Simulasi, Percobaan, Transmitter dan Receiver menggunakan Osiloskop, Signal Generator, Speaker, dan Arduino uno. Hasil simulasi ini memberikan manfaat utama yaitu Memudahkan dalam memahami prinsip kerja dari Marker Beacon sekaligus memberikan gambaran tentang gelombang yang dipancarkan oleh marker beacon menggunakan osiloscope serta menambah pengetahuan tentang Alat Navigasi ILS khususnya peralatan Marker Beacon.
Optimalisasi Kapasitas Apron Bandar Udara Internasional Minangkabau Padang
Authors: Irfan  , Mutmainnah Nurul
Published: June 2021

Bandar udara Internasional Minangkabau   memiliki satu apron dan satu hanggar.  Apron tersebut memiliki 7 parking stand dengan number of parking stand adalah 1, 2, 3, 4, 5, 6A, dan 7. Parking stand 1 dan 7 di khususkan untuk pesawat light aircraft. Parking stand 2 dikhususkan untuk penerbangan Internasional. Keberadaan parkir 1 dan 7 kurang optimal karena jarang pesawat jenis light aircraft yang beroperasi. Jika terjadi jam puncak jumlah pesawat yang akan parkir di apron kurang mampu dilayani berdasarkan parking stand yang tersedia sehingga pesawat sering di holding di taxiway alpha, hal ini berdampak terhadap nilai waktu bagi penumpang dan nilai biaya bagi maskapai penerbangan. Tujuan penelitian ini adalah untuk menganalisis optimal kapasitas apron di bandar udara Internasional Minangkabau Padang.  Metode penelitian dilakukan melalui analisis parkir stand terhadap pengaturan traffic di movement area melalui deskripsi analisis indeks parkir, durasi parkir, serta akumulasi parkir pada jam puncak dibandingkan dengan kapasitas apron yang tersedia serta slot time yang ditetapkan. Optimalisasi parkir pesawat (apron) Bandar udara internasional Minangkabau Padang  dapat dilakukan melalui pengurangan parkir stand dari 7 menjadi 6 dengan dimensi pesawat medium, serta menekankan kepada pihak operator penerbangan agar tetap konsisten pada slop time yang ditetapkan atau mengusulkan revisi slop time pada waktu yang cukup luang
Tinjauan Isolated Parking Area Terhadap Pelayanan Lalu Lintas Udara di Bandar Udara Internasional I Gusti Ngurah Rai Bali
Authors: Nur Muhammad , Yulia Tristin Lia , Filky Rihwanul Ayub Muh
Published: June 2021

Bandar Udara Internasional I Gusti Ngurah Rai Bali merupakan salah satu Bandar Udara Internasional yang melayani rute domestic dan rute internasional dengan jumlah pergerakan pesawat yang semakin padat.Pemberian pelayanan pemanduan lalu lintas udara yang maksimal, selain ditentukan oleh sumber  daya manusianya terkait pula factor peralatan, prosedur, serta fasilitas Bandar Udara yang mendukung.Letak Isolated Parking Area yang berada di taxiway N7P memberikan efek yang kurang efektif terhadap kelancaran pelayanan lalu lintas udara di Bandar Udara Internasional I Gusti ngurahRai Bali. Disebutkan dalam Document 8973 tentang Security Manual for Safe guarding Civil Aviation Against Acts of Unlawful Interference Volume III, bahwa jika terjadi ancaman pembajakan pesawat, maka pesawat harus diarahkan ke isolated parking area. Apabila area tersebut dilalui oleh taxiway atau runway, maka taxiway dan runway tersebut harus ditutup. Tujuan penelitian ini untuk meninjau letak isolated parking area terhadap pelayanan lalu lintas udaradi Bandar Udara Internasional I Gusti Ngurah Rai Bali