bluuebunny/crossref_metadata_2025 huggingface dataset:
Adaptive Finite-time Dynamic Surface Neural Network Control of an Uncertain Robot with Output Constraint and Input Saturation
Authors: Zhang Zhao , Peng Lingxi , Zhao Zhijia
Published: July 2021

In this study, a finite-time dynamic surface neural network control is developed for an uncertain n-link robot subject to input saturation and output constraints. First, a barrier Lyapunov function and a hyperbolic tangent function are applied to solve the system constraints using a dynamic surface control. Subsequently, a radial basis function neural network is utilized to handle system uncertainties. Then, a finite-time filter is employed in the design to achieve the fast convergence and a Nussbaum function is employed to optimize the design process. Finally, the simulation results show that the dynamic tracking error is proved to converging to zero, and the proposed control method is effective and never violates the constraints.
Efficacy of Artesunate-Amodiaquine and Artemether-Lumefantrine for Uncomplicated Plasmodium Falciparum Malaria in Madagascar, 2018
Authors: Dentinger Catherine M. , Rakotomanga Tovonahary Angelo , Rakotondrandriana Antsa , Rakotoarisoa Arinomenjanahary , Rason Marie Ange , Moriarty Leah F. , Steinhardt Laura C. , Kapesa Laurent , Razafindrakoto Jocelyn , Svigel Samaly S. , Lucchi Naomi W. , Udhayakumar Venkatachalam , Halsey Eric S. , Ratsimbasoa C. Arsène
Published: July 2021

Background: Since 2005, artemisinin-based combination therapy (ACT) has been recommended to treat uncomplicated Plasmodium falciparum malaria in Madagascar. Artesunate-amodiaquine (ASAQ) and artemether-lumefantrine (AL) are the first- and second-line treatments, respectively. A therapeutic efficacy study was conducted to assess ACT efficacy and molecular markers of antimalarial resistance.Methods: Children aged six months through 14 years with uncomplicated P. falciparum malaria and a parasitemia of 1,000—100,000 parasites/µl determined by microscopy were enrolled from May—September 2018 in a 28-day in vivo trial using the 2009 World Health Organization protocol for monitoring antimalarial efficacy. Participants from two communes, Ankazomborona (tropical, northwest) and Matanga (equatorial, southeast), were randomly assigned to ASAQ or AL arms. PCR correction was achieved by genotyping seven neutral microsatellites in paired pre- and post-treatment samples. Genotyping assays for molecular markers of resistance in the pfk13, pfcrt, and pfmdr1 genes were conducted.Results: Of 344 patients enrolled, 164/170 (96%) receiving ASAQ and 170/174 (98%) receiving AL completed the study. For ASAQ, the day-28 cumulative PCR-uncorrected efficacy was 100% (95% CI 100–100) and 95% (95% CI 91–100) for Ankazomborona and Matanga, respectively; for AL, it was 99% (95% CI 97–100) in Ankazomborona and 84% (95% CI 76–92) in Matanga. The day-28 cumulative PCR-corrected efficacy for ASAQ was 100% (95% CI 100–100) and 97% (95% CI 94–100%) for Ankazomborona and Matanga, respectively; for AL, it was 100% (95% CI 99–100) in Ankazomborona and 96% (95% CI 91–100) in Matanga. Of 83 successfully sequenced samples for pfk13, no mutations associated with artemisinin resistance were observed. A majority of successfully sequenced samples for pfmdr1 carried either the NFD or NYD haplotypes corresponding to codons 86, 184, and 1246. Of 82 successfully sequenced samples for pfcrt, all were wild type at codons 72–76. Conclusion: PCR-corrected analysis indicated that ASAQ and AL have therapeutic efficacies above the 90% WHO acceptable cut-off. We did not observe any genetic evidence of resistance to artemisinin, consistent with the clinical outcome data. However, the most common pfmdr1 haplotypes were NYD and NFD, previously associated with tolerance to lumefantrine.
The Call for Strengthening Monitoring of Private Pharmacies and Drug Shops in Low and Middle Income Countries (LMICs).
Authors: luoga Pankras
Published: July 2021

Background: The Developing countries have recorded the growing trend of private pharmacies and drug shops. This paper underscores the reasons for ineffective monitoring and the importance of monitoring the services offered by the private pharmacies.
Nicht-binäre Coming-Out-Berichte
Authors: Lüth Nanna
Published: July 2021

Ausgehend von den sich wandelnden medialen und kommunikativen Praktiken von queeren Jugendlichen geht es hier um den Versuch, Spielräume von nicht-binären Verhaltenscodes und Gegen-Erzählungen aufzuzeigen, die sich online eröffnen. Nicht-binär (oder non-binary) ist eine Selbstbezeichnung von Personen, die sich ausserhalb der binären Geschlechterordnung verorten, die also weder (nur) weiblich, noch (nur) männlich sind. Fraglich ist, wie angesichts eines dominanten Geschlechterregimes, das auf einer kurz nach der Geburt erfolgten Geschlechtszuweisung und Heterosexualität beruht, in den betrachteten Videos davon abweichend Selbst- und Fremdbestimmung verhandelt werden. Wie lassen sich nicht-binäres Wissen und Selbstbewusstsein in eigenproduzierten Kurzvideos vermitteln? Inwieweit findet bei den sich darin artikulierenden Jugendlichen Anpassung und inwieweit Subversion statt? Und perspektivisch betrachtet: Welche Rolle kann das Internet als Handlungsraum für non-binary Jugendliche spielen?
Common Myths About Entrustable Professional Activities
Authors: Iqbal Muhammad Zafar , Al-Eraky Mohamed M
Published: July 2021

Entrustable professional activities (EPAs) are continuously gaining worldwide popularity in competency-based clinical training programmes. EPAs are discrete units of professional practice that are used to determine the readiness of a trainee in a particular training context. Despite their evergrowing recognition in health professions education, some critical misconceptions exist on the original nuance of EPAs that can potentially compromise their utility and operationalisation. For instance, EPAs are often confused with other educational entities such as competencies, outcomes and abilities. In this study, we attempt to address some common myths associated with EPAs and provide further clarification through examples to help readers differentiate between a true and a pseudo EPAs.
The Best Online Tools Based on Media Preference Reflected by Health Information Received on Social Media amongst Diabetic Patients in Hospital Canselor Tuanku Muhriz, Kuala Lumpur, Malaysia
Authors: Hussein Siti Zuhaida , Hong Chuo Chung , Mohd Said Fawwaz , Tumingan Khairunnisa , Sahar Shah Nurshalin , Abu Bakar Suraya Hanim
Published: July 2021

Background: Diabetes mellitus has become a major public health problem globally. Social media could be useful in assisting clinical practice and sharing health-related information to improve self-management and to promote a positive behavioural change. This study aims to develop a guide on the best online tools by determining the media preference reflected by health- related information received from social media amongst diabetic patients in Hospital Canselor Tuanku Muhriz (HCTM), Universiti Kebangsaan Malaysia, Kuala Lumpur.
Methods: This study was conducted cross-sectional on 174 respondents, who were selected by using a simple random sampling method. Socio-demographic data and the use of the internet and media for health-related information were obtained via questionnaires.
Results: The most preferred social media used for searching and sharing health-related information was WhatsApp (73.6%), followed by Facebook (67.8%), Instagram (18.4%) and Twitter (17.2%). The social media preference related to socio-demographic data of age was statistically significant (P < 0.002), which had a medium effect. Furthermore, the media preference was not significantly related to health-related information searched or shared on social media and the frequency of usage.
Conclusion: Indeed, the social media have been an essential media platform to enhance public awareness concerning public health. This calls for evolution to further enhance the use of social media amongst healthcare practitioners to emphasise health promotion and empower the patients to play an active role in their healthcare. This study provides a guideline for the medical researchers, practitioners or healthcare providers in choosing WhatsApp as an online medium to communicate with diabetic patients in the future, specifically in Malaysia.
Development and Validation of a Malaysian Blood Donor’s Satisfaction Questionnaire
Authors: Pei Pei Tan , Chee Tao Chang , Abdul Rahman Jernih , Mohd Noor Sabariah
Published: July 2021

Objective: To develop and validate a questionnaire which evaluates the blood donors’ satisfaction.
Background: In Malaysia, blood procurement relies mainly on voluntary non- remunerated donors. Hence, it is important to ensure the satisfaction of the blood donors in order to increase retention.
Methods: This study was conducted among blood donors who attended blood donation and understood the Malay language. Non-Malaysian and illiterate donors were excluded. The questionnaire was developed by the transfusion medicine team. Content validity was established by content reviewers, while face validity was examined in the cognitive debriefing stage. For the 18- item questionnaire, 90 respondents were required based on the 1:5 ratio. A retest was performed in two weeks’ time.
Results: One hundred and thirty-seven participants responded in the first phase, while 103 responded after two weeks. The five domains were: technical, interpersonal, accessibility/ convenience, physical experience and overall satisfaction. The Kaiser-Meyer-Olkin (KMO) value was 0.896, with significant Bartlett’s Test of Sphericity (P < 0.001). The factor loadings ranged from 0.729 to 0.953. The Cronbach alpha values of the five domains ranged from 0.814 to 0.955 and the intraclass correlation coefficient ranged from 0.663 to 0.847.
Conclusion: The Malaysian blood donor’s satisfaction (M-BDS) questionnaire is a reliable and valid tool suitable for the assessment of blood donor’s satisfaction in blood donation centres.
Experimental determination of solubility constants of saponite at elevated temperatures in high ionic strength solutions
Authors: Xiong Yongliang
Published: July 2021

Saponite occurs in a wide range of environments from hydrothermal systems on the Earth to surface deposits on Mars. Of practical importance is that Mg-saponite forms when glasses for nuclear waste are altered in Mg-bearing aqueous solutions. In addition, saponite is favorably considered as candidate buffer material for the disposal of high-level nuclear waste and spent nuclear fuel in harsh environments. However, the thermodynamic properties, especially for Mg-saponites, are not well known. Here the author synthesized Mg-saponite (with nitrate cancrinite) following a previously reported procedure and performed solubility experiments at 80 °C to quantify the thermodynamic stability of this tri-octahedral smectite in the presence of nitrate cancrinite. Then, in combination with the equilibrium constant at 80 °C for the dissolution reaction of nitrate cancrinite from the literature, the author determined the solubility constant of saponite at 80 °C based on the solution chemistry for the equilibrium between saponite and nitrate cancrinite, approaching equilibrium from the direction of supersaturation, with an equilibrium constant of –69.24 ± 2.08 (2σ) for dissolution of saponite at 80 °C. Furthermore, the author extrapolated the equilibrium constant at 80 °C to other temperatures (i.e., 50, 60, 70, 90, and 100 °C) using the one-term isocoulombic method. These equilibrium constants are expected to have applications in numerous fields. For instance, according to the extrapolated solubility constant of saponite at 50 and 90 °C, the author calculated the saturation indexes with regard to saponite for the solution chemistry from glass corrosion experiments at 50 and 90 °C from the literature. The results are in close agreement with the experimental data. This example demonstrates that the equilibrium constants determined in this study can be used for reliable modeling of the solution chemistry of glass corrosion experiments.
Hydrothermal troctolite alteration at 300 and 400 °C: Insights from flexible Au-reaction cell batch experimental investigations
Authors: Hansen Christian T. , Lissenberg C. Johan , Kahl Wolf-Achim , Bach Wolfgang
Published: July 2021

Troctolites are increasingly recognized as a common rock found in association with oceanic core complexes. They are similar to komatiite in composition, and hence troctolite alteration may provide insight into H2 production on Early Earth. We investigated the hydrothermal alteration of olivine-rich troctolites in two batch experiments (300 °C, and 400 °C – 40 MPa) by reacting forsteritic olivine and anorthite-rich plagioclase with salt solutions. The alteration process was evaluated based on concomitant fluid samples and solids retrieved upon the termination of the experiments. In both experiments, the initial rock powder was turned into a hard, compact mass through cementation by secondary phases. The heterogeneity of this mass was documented using µ-computed tomography and electron microscopy. Thermodynamic computations were conducted to determine the equilibrium phase assemblages and fluid compositions with increasing reaction turnover.

Mineral zonation developed between the fast-reacting, fluid-dominated top portion of the solids and the more isolated portions at the bottom of the reaction cell. At 300 °C, the total reaction turnover after 1800 h was 77.5%. Serpentinization of olivine controlled the fluid composition after plagioclase had reacted away in the top layers. In contrast, a Ca- and Al-enriched assemblage of xonotlite and chlorite developed alongside unreacted plagioclase at the bottom. The porosity is very low in the top layers but high (around 15%) in the bottom part of the cemented mass. At 400 °C, the reaction turnover was only 51% as olivine was stable after plagioclase had reacted away. Clinopyroxene and andradite ± chlorite had formed in the top layers, whereas xonotlite, grossular, and chlorite had formed at the bottom. The permeability is more uniform and the mineral zonation less pronounced at 400 °C. These mineral zonations developed as a consequence of increased mobility of Ca, Al, Mg, and to a lesser extent of Fe in the experiment, which may be facilitated in the highly permeable granular materials when compared to a compact rock. Steady-state hydrogen concentrations were at least 20 mmol L−1 at 300 °C and <1 mmol L−1 at 400 °C. A lack of magnetite formation at the higher temperature is responsible for the low-H2 yields.
Etching of fission tracks in monazite: Further evidence from optical and focused ion beam scanning electron microscopy
Authors: Jones Sean , Kohn Barry , Gleadow Andy
Published: July 2021

A series of experiments on monazites from Victoria, Australia, is presented to further understand their fission track etching properties. Using a 6 M HCl etchant at 90 °C, SEM images on crystal (100) pinacoid faces reveal well-etched rhombic spontaneous fission track openings. Average rhombic etch pit diameters Dpc and Dpb, parallel to the crystallographic c- and b-axes are 0.81 ± 0.20 µm and 0.73 ± 0.26 µm, respectively. An angular distribution experiment on (100) faces found that spontaneous fission tracks initially etch anisotropically, being preferentially revealed at an azimuth of 90° to the crystallographic c-axis up to ~60 min of etching. As etching continues, however, the distribution becomes progressively more uniform and is essentially isotropic by 90 min. Two experimental methods determined the rate at which the etchant penetrated along the lengths of implanted 252Cf fission tracks. This involved the application of a focused ion beam scanning electron microscope (FIB-SEM) to mill progressively into slightly etched monazite crystals followed by an etch-anneal-etch approach. Results indicate that at least the greater part of the etchable ranges of the latent fission tracks were penetrated by the 6 M HCl etchant within the first few minutes. Continued etching to 5 min indicates that track etching slows down toward the ends of the tracks, but the maximum ranges are estimated to be reached after 5–15 min, which represents the longest time the latent segments of the tracks are exposed to potential annealing at the etchant temperature. Taking into account that implanted 252Cf fission tracks in monazite anneal on average ~4% of their length at 90 °C after 1 h (Jones et al. 2019), suggests that a much shorter duration for exposure to this temperature causes less than ~1% of fission track length reduction during etching.
Gungerite, TlAs5Sb4S13, a new thallium sulfosalt with a complex structure containing covalent As-As bonds
Authors: Kasatkin Anatoly V. , Plášil Jakub , Makovicky Emil , Chukanov Nikita V. , Škoda Radek , Agakhanov Atali A. , Tsyganko Mikhail V.
Published: July 2021

Gungerite, TlAs5Sb4S13, is a new mineral from the Vorontsovskoye gold deposit in Northern Urals. It occurs in limestone breccias composed of calcite and dolomite and cemented by orpiment, pyrite, realgar, stibnite, and minor baryte and quartz. It belongs to the latest phases among sulfosalts (chiefly Tl-As-Sb ones) present in the ore. The empirical formula (based on the sum of all atoms = 23 pfu) is Tl0.99As5.29Sb3.77S12.95. The Raman spectrum exhibits bands corresponding to As-S and Sb-S stretching vibrations, and a band at 263 cm−1 that is assigned to As–As stretching vibrations. Gungerite is bright orange with an orange streak, greasy luster, and perfect cleavage on {010}. It is translucent in thin fragments. The calculated density is 4.173 g/cm3. In reflected light, the mineral is yellowish-white with very weak bireflectance. In crossed polars, it is distinctly anisotropic but anisotropy effects are masked by strong internal reflections of bright orange color. Gungerite is orthorhombic, with the space group Pbcn. Unit-cell parameters determined from the single-crystal X-ray diffraction data are as follows: a = 20.1958(3) Å, b = 11.5258(2) Å, c = 20.1430(2) Å, and V = 4688.74(12) Å3 (Z = 8). The crystal structure consists of doughnut-shaped (As,Sb)-S clusters, which have van der Waals contacts to most of the surroundings, and are connected to them only by sparse cation-sulfur bonds. These clusters are formed by a chelating mirror-symmetrical group, which is “stacked” on, around, and along rods of the TlS9 coordination polyhedra; these rods are oriented parallel to [010]. An individual doughnut-shaped cluster with a central TlS9 polyhedron half-inserted into it contains one As–As bond 2.449 Å long. The polar Tl rods form a chessboard arrangement with occasional stacking errors leading to twinning on (101). The large and complex structure of gungerite shows remote similarities to that of gillulyite and the rod-like structure of lorándite.
Ferrous hydroxychlorides hibbingite [γ-Fe2(OH)3Cl] and parahibbingite [β-Fe2(OH)3Cl] as a concealed sink of Cl and H2O in ultrabasic and granitic systems
Authors: Koděra Peter , Majzlan Juraj , Pollok Kilian , Kiefer Stefan , Šimko František , Scholtzová Eva , Luptáková Jarmila , Cawthorn Grant
Published: July 2021

Ferrous hydroxychlorides are geochemically important but less recognized mineral species due to their extreme sensitivity to oxidation and hydration in contact with air {typically they convert to akaganéite [Fe3+(O,OH,Cl)]}. Only the γ-form was previously known as the orthorhombic mineral hibbingite, associated with altered mafic intrusive rocks. In this study, we describe the β-polymorph of Fe2(OH)3Cl as a new mineral parahibbingite that was found in pyroxenite from the Karee platinum mine in the Bushveld Complex, South Africa. The two minerals were distinguished by a combination of Raman spectroscopy and FIB-SEM-TEM analytical techniques (TEM-EDX and TEM-SAED). They can be easily recognized by their distinct Raman spectra. Parahibbingite has two very strong vibration bands at ~3550 and 3560 cm–1, accompanied by much weaker bands at ~124 and 160 cm−1, while the Raman spectrum of hibbingite has a sharp, strong band at 3450 cm−1 and two moderate bands at 199 and 385 cm−1.

Parahibbingite was found as fine-grained reaction rims at the contact of orthopyroxene phenocrysts and talc inside a drill core. It has a trigonal space group [R3m, a = 6.94(5) Å; c = 14.5(2) Å], with an empirical formula (Fe1.982+Mn0.012+Ca0.01)(OH)3.08Cl0.92. The origin of this mineral in the Bushveld Complex is most likely related to a late hydrothermal alteration of pyroxenite. Hibbingite forms as an abundant daughter mineral hosted by fluid inclusions and salt melt inclusions in hydrothermal quartz associated with granitic systems during cooling under reducing conditions. Such inclusions are common in Au-porphyry mineralization worldwide, such as the Biely Vrch (Slovakia) deposit studied in detail in this work. The lattice parameters obtained by TEM-SAED are a = 6.30 Å, b = 7.12 Å, and c = 9.89 Å.

Hibbingite was recognized as the only phase that carries “water” (as a hydroxyl group) in otherwise water-free, salt melt inclusions. Furthermore, both hibbingite and parahibbingite should be considered as reservoirs for Cl and H2O in large volumes of altered basic and ultrabasic rocks. They can transport volatiles to shallow levels of subduction zones. Alternatively, their dissolution can fuel remobilization, transport, and deposition of sulfidic ores in saline fluids. Their detection, however, is difficult because of their sensitivity to oxidizing atmospheres. For example, in natural outcrops exposed to air, they may vanish, thus distorting estimates of their abundance and role in many processes that involve mineral-derived volatiles.
Hydrothermal mineralization of celadonite: Hybridized fluid–basalt interaction in Janggi, Korea
Authors: Park Jongkyu , Lim Hoseong , Myeong Bora , Jang Yun-Deuk
Published: July 2021

The origin of celadonite still remains enigmatic and fragmentary. Exceptional celadonite mineralization was discovered in the Miocene lacustrine Janggi Basin in the southeastern Korean Peninsula. This Janggi celadonite is a greenish, earthy/vitreous material filling east-west trending fault zones in basaltic flows. The scale of the celadonite body is up to a meter thick and laterally extends ~10 m. These occurrences are markedly in contrast with celadonite as vesicle-filling or mineral-replacing types in the literature. The Janggi celadonite allows exploring the puzzling genesis of celadonite and comparing its characteristics with global cases for a better understanding of celadonite formation.

X-ray diffraction and microprobe analyses demonstrate that the Janggi celadonite ranges from ferroceladonite through celadonite to ferroaluminoceladonite and is mixed with opal at a ratio of up to ~3:7. Detailed fieldwork and whole-rock major, trace, and oxygen isotope analyses indicate that celadonite is formed in an open system at ~120 °C by the interaction of hybridized fluid (a mixture of <55% magmatic and >45% other origins) and basalts during the physicochemical fault brecciation of the host rock. The cations needed for celadonite formation were supplied from the smectitization/zeolitization of rhyolitic mesostasis (for Al and part of K) and pyroxene microlites (for Fe and Mg) in the basaltic breccias during the associated oxidation of micro-nanoparticles by circulating fluids (for most of K).

A comparison of the Janggi celadonite with global cases highlights that celadonite genesis is neither limited to the seawater alteration of basalt nor do hosts and reactive fluids control celadonite compositions. A contextualized perspective on celadonite genesis alludes that a potassic alteration of rock that is rich in ferromagnesian components in a shallow crustal environment (<~200 MPa at <~450 °C) produces celadonite. Because of the relative availability of the necessary components for celadonite precipitation, our model predicts celadonite mineralization in many volcanic environments, where magmatic fluid and particle size reduction could contribute. These insights emphasize celadonite’s potential applications for tracing geothermal history.
Impact of fluorine on the thermal stability of phlogopite
Authors: Sun Jiaqi , Yang Yan , Ingrin Jannick , Wang Zhongping , Xia Qunke
Published: July 2021

Knowledge of volatile cycling is vital to understanding the evolution of the planet and the life it supports. Although it has been gradually accepted that the mantle is a vast storehouse of H2O and other volatiles, the impact of coexisting volatiles on the thermal stabilities of OH and the lattice of the host mineral is still poorly understood. Phlogopite is one of the few hydrous minerals capable of carrying both water and halogens into the mantle. Previous observations from both experiments and textural relationships in natural samples have indicated that F-rich phlogopite can be stable under ultrahigh-temperature conditions. Here, the impact of F on the thermal stability of phlogopite was investigated via XRD, Raman, and IR spectroscopy from room temperature to 1000 to 1200 °C. Based on the experimental results from F-poor and F-rich natural phlogopites, we show that about 4 wt% F can increase the breakdown temperature of phlogopite by 100 °C under ambient pressure. The impact mechanism mainly involves preventing OH and lattice softening at high temperatures. This study reveals the links between F and the behavior of OH and phlogopite lattice, which is important for constraining volatile cycling, as well as the role of F in the physical and chemical properties of the upper mantle.
Protocaseyite, a new decavanadate mineral containing a [Al4(OH)6(H2O)12]6+ linear tetramer, a novel isopolycation
Authors: Kampf Anthony R. , Cooper Mark A. , Hughes John M. , Ma Chi , Casey William H. , Hawthorne Frank C. , Marty Joe
Published: July 2021

Protocaseyite, [Al4(OH)6(H2O)12][V10O28]·8H2O, is a new mineral (IMA2020-090) occurring in low-temperature, post-mining, secondary mineral assemblages at the Burro mine, Slick Rock district, San Miguel County, Colorado, U.S.A. Crystals of protocaseyite are saffron-yellow, thick blades, with pale orange-yellow streak, vitreous luster, brittle tenacity, curved fracture, two very good cleavages, a Mohs hardness of 2, and a density of 2.45(2) g/cm3. The optical properties of protocaseyite could be only partly determined: biaxial with α = 1.755(5), β < 1.80, γ > 1.80 (white light); pleochroic with X and Y yellow, Z orange (X ≈ Y < Z). Electron-probe microanalysis and crystal-structure solution and refinement provided the empirical formula [(Al3.89Mg0.11Ca0.02)Σ4.02(OH)6(H2O)12][H0.06V10O28]·8H2O. Protocaseyite is triclinic, P1, a = 9.435(2), b = 10.742(3), c = 11.205(3) Å, α = 75.395(7), β = 71.057(10), γ = 81.286(6)°, V = 1036.4(5) Å3, and Z = 1. The crystal structure (R1 = 0.026 for 4032 Io>2 σI reflections) contains both the [V10O28]6− decavanadate polyoxoanion and a novel [Al4(OH)6(H2O)12]6+ polyoxocation.
Zolenskyite, FeCr2S4, a new sulfide mineral from the Indarch meteorite
Authors: Ma Chi , Rubin Alan E.
Published: July 2021

Zolenskyite (IMA 2020-070), FeCr2S4, is a new sulfide mineral that occurs within troilite, with clinoenstatite and tridymite, in the matrix of the Indarch meteorite, an EH4 enstatite chondrite. The mean chemical composition of zolenskyite determined by electron probe microanalysis, is (wt%) S 43.85, Cr 35.53, Fe 18.94, Mn 0.68, Ca 0.13, total 99.13, yielding an empirical formula of Fe0.99Mn0.04Ca0.01Cr1.99S3.98. The ideal formula is FeCr2S4. Electron backscatter diffraction shows that zolenskyite has the C2/m CrNb2Se4-Cr3S4-type structure of synthetic FeCr2S4, which has a = 12.84(1) Å, b = 3.44(1) Å, c = 5.94(1) Å, β = 117(1)°, V = 234(6) Å3, and Z = 2. The calculated density using the measured composition is 4.09 g/cm3. Zolenskyite is a monoclinic polymorph of daubréelite. It may be a high-pressure phase, formed from daubréelite at high pressures (several gigapascals) and moderate temperatures in highly shocked regions of the EH parent asteroid before becoming incorporated into Indarch via impact mixing. Zolenskyite survived moderate annealing of the Indarch whole-rock. The new mineral is named in honor of Michael E. Zolensky, an esteemed cosmochemist and mineralo-gist at NASA’s Johnson Space Center, for his contributions to research on extraterrestrial materials, including enstatite chondrites.
Exploring determinants of innovation potential of enterprises in Kazakhstan
Authors: Kireyeva Anel , Nurbatsin Akan , Yessentay Aigerim , Bagayeva Nazyken , Turdalina Sharbanu
Published: July 2021

The study aims to analyze the innovation potential of enterprises, explain the use of the binary regression methodology, and explore different indicators of the enterprises in the regions of Kazakhstan for building an effective management strategy. Methodological substantiation is based on the complex survey data analysis, provided by the World Bank Enterprises Survey (WBES) for Kazakhstan. WBES database has covered a sociological survey of enterprises, which was conducted using a random survey and representativeness among 1,296 enterprises, mainly in the production sector. Besides, the data were collected among companies regarding their experience in environmental perception (including innovation activity), in which they worked. The results have demonstrated that the age of the company, exporter status, type, sector, or activity – all these have a positive influence on the company’s tendency to innovations. However, as part of the study, it has found out that competitors in the marketplace and regions of activity of enterprises predominantly negatively affect the prospects of introducing innovation. It was also in evidence that the same factors (foreign ownership, advanced training, type, size, and sector of an enterprise) are essential determinants of product, technology, R&D, ICT, and innovation. Obtained results can be used by enterprises for building an effective management strategy of own business innovative development, as well as by local authorities to upgrade the competitive performance.
AcknowledgmentsThis study has been funded by the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan (Grant “Priorities and mechanisms of inclusive regional development of Kazakhstan in the context of overcoming the economic recession” No. AP09259004).
La transferencia del conocimiento en la red. Análisis del portal educativo Yo Soy Tu Profe
Authors: Ruiz Domínguez Miguel Ángel , Area Moreira Manuel
Published: July 2021

El objetivo de este trabajo es analizar el impacto y alcance de Yo Soy Tu Profe, un proyecto de enseñanza y divulgación digital que, tras cinco años desde su creación, ha alcanzado gran repercusión nacional e internacional. Para ello, se analiza la frecuencia de uso y de contenido del portal educativo, eje central del trabajo, y de las distintas redes sociales que apoyan y convierten la web en un espacio de aprendizaje. En este sentido y, en primer lugar, se realiza una exposición del contexto digital vigente y de las distintas herramientas disponibles que favorecen el intercambio y gestión del conocimiento, al igual que los otros escenarios en los que el alumnado se desarrolla vital e intelectualmente en la red. Posteriormente, se muestran los resultados obtenidos durante estos años, analizando qué contenidos son los que más repercusión han tenido y de dónde se producen estas visitas. Por último, el artículo se concluye con una indagación reflexiva sobre los usos de las plataformas y aplicaciones utilizadas en función de su idiosincrasia y características.
Mediación digital parental. ¿Es necesaria una educación digital en la primera infancia?
Authors: Grané I Oró Mariona
Published: July 2021

Familias y educadores se debaten entre la visión de oportunidad educativa y el pánico de las consecuencias del uso de tecnología por parte de los más pequeños. Las incertidumbres son diversas y no existen demasiadas investigaciones que muestren como madres y padres integran las tecnologías en casa y como gestionan la relación de sus hijos con las pantallas. La situación pone de manifiesto que más allá de preocuparse es necesario ocuparse.

Este estudio se interroga sobre la necesidad de pensar y diseñar acciones de acompañamiento, educativas y contextualizadas del uso de las tecnologías digitales durante la primera infancia. El articulo presenta una revisión sistematizada de los estudios realizados en la línea de crianza digital (digital parenting) que atienden específicamente a niños y niñas menores de 6 años.

Con el objetivo de encontrar respuesta a la influencia familiar en el uso de medios y sus repercusiones en el desarrollo, comprender el alcance de la investigación en crianza digital, analizar las necesidades de profundización y los vacíos de conocimiento sobre la cuestión.
Uso de las TIC en el hogar durante la primera infancia
Authors: Franco Hernández Susana
Published: July 2021

La incorporación de los dispositivos móviles en nuestros hogares es algo que se encuentra totalmente asumido en nuestra cotidianidad. Y por ende, también en la vida de nuestros hijos, quienes, desde edades cada vez más tempranas tienen acceso a los dispositivos móviles de manera habitual. El papel que los padres y tutores desempeñan en esta precoz interacción de los niños con la tecnología resulta crucial para que éstos establezcan una relación positiva con el entorno digital. Estos dispositivos pueden contribuir al desarrollo de destrezas y habilidades muy enriquecedoras para el menor, teniendo siempre en cuenta las medidas de seguridad existentes y aquellos hábitos de conducta que posibiliten a los más pequeños acercarse a la tecnología de manera segura y en función de las necesidades de la etapa de desarrollo en la que se encuentren.

Esta investigación de carácter descriptivo y correlacional, ha recabado información acerca de los hábitos de uso de los dispositivos móviles por parte de niños de 3 a 6 años a través de la los datos proporcionados por sus padres y tutores, con el fin de obtener conocimiento sobre diferentes aspectos que tienen que ver con el uso cotidiano de estos dispositivos por parte de sus hijos.
EFL Students’ Perception and Motivation Toward Quizizz as E-Learning Media in English E-Classroom
Authors: Ika Dhamayanti Farah
Published: July 2021

This study investigates the English as Foreign Language (EFL) students' perception and motivation toward Quizizz as e-learning media in English e-classroom. The total number of participants in this study is 106 students of 11th graders of Senior High School consist of five classes who had experience toward Quizizz. A descriptive statistics approach is applied in this study. The data collected by using closed-ended questionnaire. The obtained data were analyzed by using SPSS version 25.00. The result shows most of EFL students had positive perception and motivation toward Quizizz. Therefore, Quizizz as e-learning media can support the learning process in English e-classroom. It indicates that Quizizz is an appropriate e-learning media that can be used in English e-classroom and it can increase EFL students’ motivation during e-learning.
PENGARUH PENAMBAHAN BIOCHAR TERHADAP PENURUNAN KADAR TOTAL PETROLEUM HYDROCARBON (TPH) PADA TANAH TERCEMAR MINYAK BUMI
Authors: Sasmita Aryo , Syakinah Amalia , Nisa Ulfatun
Published: July 2021

Hydrocarbons are compounds produced as a result of the activities of the petroleum industry, which can pollute the soil and waters. Due to the amount of waste, biochar from agricultural waste could potentially be used as a soil amendment agent for hydrocarbon contamination. The high lignocellulose in oil palm shells and empty bunches makes them potential raw materials for biochar. The purpose of this study was to explore the effect of biochar application on petroleum-contaminated soil to reduce Total Petroleum Hydrocarbon (TPH) levels. In this study, the dosage of biochar was added to the soil contaminated with petroleum with a variation of 3%, 5%, and 7% (w/w) and control without the addition of biochar. The parameters analyzed were TPH levels by gravimetric method every week for four weeks. The results showed that the addition of biochar had an effect on the degradation of TPH. The greater the dose of biochar used, the higher the percentage of TPH degradation. The highest decrease in TPH levels occurred at the addition of biochar dose by 7%, where the empty shell was 60.65%, and empty bunches was 54.1% which was greater than without the addition of biochar by 32.79%.
EVALUASI KESESUAIAN LAHAN UNTUK TANAMAN MANGGIS DAN POTENSI PENGEMBANGANNYA DI KECAMATAN PAUH KOTA PADANG
Authors: Sari Dyah Puspita , Novia Ranti , Juniarti J
Published: July 2021

Pauh District was chosen as mangosteen plantation development centre in Padang City. This development should be based on the land suitability so that the mangosteen plant are able to grow according to the climate and soil conditions. This research was conducted in Pauh District, Padang City and Soil Science Laboratory Andalas University. This study used a survey method that consisted of preparation, pre-survey, the main surveiy, laboratory analysis, and data processing. Evaluation of land suitability was done with matching method which compare the characteristics of land suitability for mangosteen growth. The results of research showed that land suitability for mangosteen was classified into S3 (marginally suitable) with subclass S3nr for land unit SL1, SL2, SL3, SL4, SL7, SL8, SL9, SL11, SL15; subclass S3eh for land unit SL14; subclass S3nr,eh for land unit SL5 and SL10. Land unit SL6, SL12, SL13, and SL16 were classified into S2 (moderately suitable) with subclass S2wa,nr for land unit SL6 and SL16; subclass S2wa,rc,nr,eh for land unit SL12; subclass S2wa,rc,nr for land unit SL13. The limiting factors was common to each land unit were nutrient retention (nr) and erosion (eh). There are 3 villages (Lambung Bukit, Limau Manis, and South Limau Manis) in Pauh District which have the greatest potential to be developed as mangosteen plantation development areas with total area was 5,862.42 ha.
DEGRADASI KARBON, NITROGEN, DAN FOSFOR TANAH PASCA KEBAKARAN LAHAN DI KEBUN KELAPA SAWIT, PROVINSI LAMPUNG
Authors: Saputra Renaldi Sambo Eka , Kurniawan Syahrul
Published: July 2021

Agricultural practices, especially land clearing by burning in peat-land, usually causes land-fire and result in nutrient degradation of peat-land. The research was aimed to assess nutrient content (i.e. C, N, P) in oil palm plantation within peatlands post land fire. The study was conducted on Tulang Bawang regency, Lampung Province. Soil samples were collected from two locations with different intensity of land fire, i.e. field with low intensity of land fire (land A) and land with high intensity of land fire (land B). In each land, the soil was taken from two depths (i.e. 0-10 cm and 10-30 cm) in three different zones of oil palm plantation, named as fertilization area, frond stack, and harvested path, with three replications of each. The variable measured including soil organic C, total N, and available P. Prior to statistical analysis, the data were tested normality. The result showed that the location with low intensity of land fire (land A) had higher soil organic C, total N, and available P at 0-10 cm and 10-30 cm depths of soil as compared to the area with high land fire intensity (land B). Application of N fertilizer and liming resulted in a higher total N at 0-10 cm depth of soil and available P (in the land A) in fertilization area as compared to frond stack and harvest path areas, both in land A and land B. Available P in land B at 0-10 cm and 10-30 cm soil depth in the fertilization area was lower than harvest path and frond stack areas, and this was probably due to the high losses through leaching and/or uptake by palm oil.
EKSPLORASI MIKORIZA ARBUSKULA INDIGENOUS PADA RHIZOSFER VEGETASI LAHAN PASCATAMBANG BATUBARA
Authors: Prayoga Muhammad Hadi , Prasetya Budi
Published: July 2021

Different types of vegetation have the potential to affect a type of spore, the number of spores, and the level of colonization in the roots. This study aims to determine the diversity of genus and the number of arbuscular mycorrhizal spores as well as the level of colonization in the vegetation of Bull Grass (Paspalum conjugatum Berg), Kemunting (Rhodomyrtus tomentosa), and Kirinyuh (Chromolaena odorata L) on post-coal mining land in Margomulyo Village, Kutai Kartanegara, Kalimantan. East. The research was conducted from February to October 2020. Sampling was carried out by purposive sampling based on the land cover area of the Bull grass, Kemunting, and Kirinyuh vegetation with four replications. Laboratory analysis was conducted in Biology Laboratory, Department of Soil Science, Faculty of Agriculture, Brawijaya University and chemical analysis of soil at the Laboratory of Soil, Faculty of Agriculture, University of Muhammadiyah Malang. The results showed that the genus Glomus was found from each of these vegetations with the number of spores in the Bull grass, Kemunting, and Kirinyuh vegetation, respectively 196 spores, 122 spores, and 100 spores per 100 g of soil, and the level of colonization in these vegetations respectively 83.33%, 63.33%, and 51.50%.
Study on Effect of Productivity on Applying Ergonomic Principle
Authors: Mani Kanitha , Mani Sasi Kumar
Published: July 2021

This study was to investigate the effect of productivity in the construction industry due to the un-ergonomic working atmosphere. The construction industry is a large number of workers concerning industry it leads to productivity loss or due risk factors in the working site. In the review, to improve analysis a drawback, we took ergonomic awareness questionnaire survey among the Engineers in Karur district. Based on the survey results, the awareness of term ergonomics is only 20% and Engineers accept to adopt the ergonomics principles. We extended our work to apply ergonomic principles in the site. The ergonomic deficiency was identified, and gradually new ergonomic principles were applied in plastering and brickwork. 1% increase in productivity measured at 7 days of implementation.
Comparing strength properties of natural and synthetic rubber mixtures
Authors: Renner T. , Pék L.
Published: July 2021

During in our research work we examine the condition of developing elastomer – metalconnection at manufacturing machine – and car industry hybrid parts. As a first step we have carried outcomparison tests relating to the strength properties of synthetic – and natural rubber mixtures. During testswe have compared four mixtures used often in the practice (NR, NBR, EPDM, CR) in three characterichardnesses (43 Sh0, 57Sh0, 72Sh0). In addition to hardness we have measured the elongation at ruptureand the density, too. As a continuation of our tests we researched what connection is between the surfaceroughness of metal plate and the elastomer – metal bonding formed.
Implementation of an unloading compliance procedure for measurement of crack growth in pipeline steel
Authors: Van Minnebruggen Koen , Van Puyvelde Dries , De Waele Wim , Verstraete Matthias , Hertelé Stijn , Denys R.
Published: July 2021

As the demand for fossil fuels increases, pipelines are constructed in inhospitable areas. Underthese conditions, not only the strength but also the deformability of the pipelines becomes crucial. A strainbased design (SBD) procedure needs to be established. Traditional stress based approaches to evaluatedefect tolerance lead to conservative predictions. There is a need to accurately define the fracturetoughness of the pipeline steel and assess the criticality of weld defects under strain based conditions. Thispaper focuses on the implementation of the unloading compliance method to determine stable crackgrowth. The standardized test procedure described in ASTM E1820 is applied. This method is a handy toolto obtain the J-resistance curves which can forecast ductile failure in pipeline girth welds. Preliminaryexperiments have been performed on Single Edge Notch Bend (SENB) specimens of plain pipe metal.Using the implemented procedure, it was possible to obtain a good fit between calculated and measuredcrack size. The most important result is the smoothness of the calculated crack growth and the rathermonotonic increase of crack size. Since testing on SENB is well known to provide conservativemeasurements, Single Edge Notch Tension (SENT) specimens will be evaluated in future work
A fruição literária na Literatura Infantil Africana
Authors: Araujo Débora Cristina de , Oliveira Thiara Cruz de
Published: July 2021

A literatura infantil africana que vem adentrando no mercado editorial brasileiro tem fomentado um campo de análise sobre suas características e tendências. Interessado nesse movimento analítico, o presente artigo teve como objetivo analisar o caráter fruitivo das obras “Sulwe”, de Lupita Nyong'o (2019), e “Ombela: a origem das chuvas”, de Ondjaki (2014). O conceito de fruição relaciona-se à dinamicidade entre o texto literário, seu público e o processo de mediação (OBERG, 2014). Nessa perspectiva, na análise realizada foi possível identificar e realçar elementos da fruição, no plano verbal, em duas narrativas que abordam temas de valorização da identidade e cultura africana. Isso também contribuiu para evidenciar a importância de tais obras para a formação literária do público brasileiro, em especial das crianças, já que apresentam perspectivas mais positivas do que em momentos anteriores da literatura infantil disponível no Brasil.
RAPID RESPONSE CENTERS FOR DISASTERS IN MEXICO: A THEORETICAL STUDY
Authors: Garzón-Garnica Eduardo-Arturo , Martínez-Flores José-Luis , Cano-Olivos Patricia , Sánchez-Partida Diana
Published: July 2021

After a disaster, reaction speed becomes one of the most important elements. To act in the best possible way, Disaster Operations Management must have the most accurate information on the affected area. To aid in these moments, a network of centers for Rapid Response is proposed here. Those centers would be equipped with short takeoff and landing aircraft, and would send them as soon as possible to the affected area, to gather information, and bring some type of aid. This research focuses on the theoretical foundation for such centers, including objectives, locations, missions, and equipment. This foundation is obtained through a literature review, which helps find the need for rapid response, and the main objectives and missions to be carried out. The number of centers and their locations are found by the use of a facility location model, considering the risk of each location. Finally, the number and type of aircraft needed in each center, as well as the missions for each one are found by the use of an assignment model. This research was made with the southeastern region of Mexico as its objective, but the resulting network of Rapid Response Centers could be setup in some other areas of the world.