Main Phase Research Articles

A multiproxy approach to reconstruct the Late Holocene environmental dynamics of the semiarid Andes of central Chile (29°S)

Mountain ecosystems located in the Andes cordillera of central Chile (29–35°S) have been strongly affected by the ongoing Mega Drought since 2010, impacting the snow cover, the surficial water resources (and thereby water storage), as well as the mountain biota and ecosystem services. Paleoenvironmental records in this part of the semiarid Andes are key to estimating the effects of past climate changes on local communities helping to forecast the ecological and biological responses under the aridification trend projected during the 21st century. Here we present a 2400-year multiproxy paleoenvironmental reconstruction based on pollen, diatoms, chironomids, sedimentological and geochemical data (XRF and ICP-MS data) of Laguna El Calvario (29°S; 3994 m a.s.l), a small and shallow Andean lake. Four main hydrological phases were established based on changes in the lithogenic and geochemical results associated with allochthonous runoff input and the subsequent response of the biological proxies. Between 2400 and 1400 cal yrs BP, wetter than present conditions occurred based on the intense weathering of the lake basin and the dominance of upper Andean vegetation. A decrease in moisture along with sub-centennial discrete wet pulses and lake-level changes occurred until ~800 cal yrs BP followed long-term stable climate conditions between 1850 and 1950 AD as suggested by a drop in vegetation productivity and low lake levels. From 1950 AD to the present, a decline in moisture with a severe trend to drier conditions occurring in the last decades occurred as reflected by an upward vegetation belt displacement around Laguna El Calvario along with a turnover of diatom assemblages and high productivity in the water column.

Design, development and evaluation of a mobile-based self-care application for patients with COVID-19 not requiring hospitalization; a study of Northwest of Iran

BackgroundGiven the effective role of a mobile applications in disease management, disease monitoring, and self-care in patients with COVID-19 disease, we aimed to design, development and evaluation of a self-care Mobile app for COVID-19 patients not requiring hospitalization.MethodsThe design, development and evaluation the usability of the self-care and education mobile app for patients with COVID-19 disease were conducted in two main phases at 2021 in Northwest of IRAN; (1) Determine the features and capabilities and (2) Design, development and evaluation of self-care mobile App. JAVA programming languages and Android Operating System were used and selected to design and development of a mobile app. There were 25 participants who conducted evaluations of the mobile app’s usability and impact using the mobile health app usability a Questionnaire of User Interface Satisfaction was administered to assess the usability of the developed application. The results were analyzed via Excel 2013.ResultsThe model of developing a mobile app as an Information System was the Waterfall model. The smartphone application based on a set of capabilities and features was designed and consists of two main parts: the login screen for user registration, and the main home menu. The user interface includes three main pages or activities; (a) Main Menu for quick access to all of the pages, (b) Symptom management and monitoring to monitor the signs and symptoms during the illness, and (c) Set Reminders and Alarms to notify patients. The users’ mean score of the application usability was calculated as 7.91 out of 9 indicating a good level of satisfaction.ConclusionThis app can be a guideline and a useful tools for managing and monitoring symptoms, reminding medications, and implementing self-care instructions in outpatients. The authors suggest evaluating the efficacy and functionality test of mobile-based applications for COVID-19 in clinical trial studies.

Increased monocarbonate formation during long-term hydration of CAC-limestone binder by calcium sulfate addition – A temperature-dependent XRD study

The long-term hydration of a mix with and without gypsum addition was investigated at 10, 23 and 40 °C by QXRD analysis. In addition, thermodynamic modelling was performed on all systems using GEMS to determine the stable phase composition and the influence of water loss during hydration. The results show that the formation of conversion-sensitive phases such as CAH10 is accelerated at 10 °C and hindered at 23 and 40 °C by the addition of gypsum. Moreover, at all different temperatures, monocarbonate forms next to AH3 as the main hydrate phase and the final phase composition is reached after at least 14 d (at 23 °C and 40 °C already after 2 d). Formation of low amounts ettringite only occurs at 10 and 23 °C during the entire storage time. At 40 °C, however, ettringite is not observed, which is probably due to water loss in the mix until 2 d.

Determination of optimal holding time for brazing Cu-Sn-Ti/diamond composites

Diamond particles are brazed by Cu-Sn-Ti active filler metals under vacuum at 1213 K. The impact of different holding times on wettability, interfacial reaction layer characteristics, and wear resistance of Cu-Sn-Ti/diamond composite has been systematically investigated. The results show that the complete encapsulation of diamond particles can only be observed after holding for 30 min or further. The interfacial reaction layer is composed of TiC, and the change of the reaction layer thickness follows a parabolic growth rate within 30 min, reaching a maximum of 1.73 μm at 30 min and then remaining almost stable thereafter. It is further shown that when the holding time approaches 30 min, the main phase of the metal matrix changes from Cu41Sn11 to Cu3Sn, and the wear resistance of Cu-Sn-Ti/diamond composite reaches the maximum value. However, further prolonging the holding time results in slight graphitization of the diamond in the sample, which will reduce the wear resistance of the brazed sample. It is recommended that the holding time shall be limited <30 min for optimized bonding strength and grinding capability.

Selective recovery of lithium from high-aluminum fly ash by using alkali-dissolution-assisted HBTA–TOPO synergistic extraction

The process of recycling lithium (Li) from common coal fly ash using strong acids can release substantial quantities of hazardous low-value residues, and the complex ionic composition of the acidic leaching solution hinders the selective extraction of Li. Accordingly, a green and economical approach was developed for the selective recovery of Li and extraction of valuable Al-rich residues from high-alumina fly ash (HAFA). In HAFA, the glass phase (the main Li-bearing phase) can be selectively dissolved in the mild NaOH solution at 95 °C for 2 h, and valuable mullite phase (the main Al-bearing phase) was retained in the leaching residue (Al2O3 content 49.00 wt%). The leaching efficiencies of Li, Si, and Al were 91.60%, 43.19%, and 3.56%, respectively. Among the primary metallic elements present in HAFA, only Li, Na, K, and Al in the glass phase were readily dissolved in the alkaline solution. Meanwhile, the synergistic extraction system of HBTA and TOPO has good complexing ability with Li + compared to Al3+, K+, and Na+. Therefore, Li+ can be selectively extracted from alkaline leaching solutions using HBTA and TOPO. The Li extraction efficiency reached 99.68% after three consecutive extractions under the optimal conditions. Finally, the used alkali leaching solution and synergistic extractants can be regenerated via Ca(OH)2 precipitation and HCl reverse extraction. These findings can provide new strategies for the green and overall utilization of HAFA.

Discovery of carbonatite-syenite hosted REE-Nb mineralization in the Amaragh area, Gleibat Lafhouda (South Morocco): Hints toward an extended mineralized alkaline province

We report the results of a reconnaissance study of several small carbonatite and syenite bodies with very low topography (up to 1.5 m), that were recently discovered in the Archean basement in the Amaragh area near the Gleibat Lafhouda (GL) carbonatite, previously interpreted as a primary carbonatite. Two varieties of carbonatite have been identified: 1) brownish to greyish banded dolomite carbonatite, composed of dolomite as the main carbonate phase, and calcite, magnetite, apatite, monazite-(Ce), magnesite and minor bastnaesite-(Ce), 2) calciocarbonatite, mainly composed of calcite and several feldspar aggregates (the latter are interpreted as xenocrysts). The Amaragh syenites consist of small outcrops and show white to dark grey colors. The main outcrop is a nepheline syenite that contains coarse-grained rounded magnetites, rimmed by biotite and epidote within a feldspar and nepheline groundmass, suggesting fluid-mineral reactions. The other syenites consist mainly of alkali feldspar, albite, mica, amphibole and accessory apatite, epidote, and titanite. The host minerals of Nb and REE are pyrochlore and allanite. All syenite samples display a peraluminous composition and strong LREE enrichment with negative EuCN anomalies, except for two samples with a slightly positive EuCN anomaly, suggesting at least two types of differentiated syenites. All samples show strong postmagmatic and hydrothermal overprint, which is revealed by, for example, the occurrence of negative YCN and positive CeCN anomalies and mica-epidote mineral reaction rims between magnetite and feldspar. The close spatial association of the Amaragh carbonatite and syenite bodies with the GL carbonatites along with geochemical and mineralogical similarities and REE-Nb enrichment suggest a close petrogenetic relationship, pointing toward a single carbonatite-syenite alkaline complex that was probably formed in an extensional tectonic setting.

Magnetization reversal processes of nanostructured PrFeB alloys

The paper considers the high-coercivity state of the melt-spun PrFeB alloys with different phase composition: the main Pr2Fe14B phase grains separated by the paramagnetic layers, single-phase state (Pr2Fe14B grains only), and combination of Pr2Fe14B and α-Fe phase grains. The phase composition and microstructure of the alloys, as well as their magnetic properties in the temperature range of 2–300 K are given. To establish the prevailing mechanism of the high-coercivity state, magnetometric techniques were used, including the study of the reversible magnetic susceptibility, and simulations by the finite difference method. The simulations of the magnetization reversal of these alloys demonstrate the complexity of this processes, which go beyond simple nucleation or pinning, and cannot be described in the framework of the Kneller-Hawig model. Models of magnetization reversal of the alloys under study are proposed. The presence and composition of the intergranular layer has a significant effect on the mechanism of the high-coercivity state.

USE OF NEW GENERATION FERTILIZERS ON WINTER TRITICALE CROPS

The article scientifically substantiates the literary sources on the cultivation of winter triticale for grain and green fodder. It is proved that the use of new high-yielding varieties of winter triticale is a powerful factor in stabilizing the grain economy of the country. Therefore, in this context, it is important to use the latest measures in innovative technologies to increase the yield and quality of crop production. Among the innovative measures in the technological process of growing agricultural crops, foliar feeding of plants with microfertilizers of biological, organic and chemical origin has become widely popular. With the correct application of these preparations, foliar feeding can be a more effective tool for eliminating the deficit in micro- and macroelements, compared to the application of mineral fertilizers in the soil, since nutrients directly enter the plant tissue in critical stages of development. Foliar fertilization does not replace soil application of fertilizers, but contributes to the effective addition of the main nutrition system and ensures an increase in the yield and quality of agricultural crops. It has been established that winter triticale is a promising, high- yielding crop, regardless of its direction of use (grain, green mass). By biological characteristics, the growth rates of the stem of winter triticale are determined by the genetic trait characteristic of all cereal crops. It has been established that from the tillering stage to the full exit into the tube, that is, during this interphase period, the height of the plants increased by 2.2-2.3 times, regardless of the varietal characteristics of the culture. It has been previously found that the use of Dr Green preparations for foliar feeding during the main growth and development phases is aimed at suppressing growth processes in height, starting from the full exit into the tube.

PROSPECTS FOR GROWING PLANTS OF THE GENUS EUSTOMA L. IN PROTECTED GROUND

The article presents the results of studies on the cultivation of Eustoma L. plants in closed ground conditions on different substrates. As a result of the cultivation, the influence of the substrate on the passage of the main phenological phases of plant growth and development was determined, as well as data on the effect on plant height and flower diameter of different varieties. Four substrates were used in the study, namely: Domoflor; Compo; Peatfield; Generous soil and seven varieties of the genus Eustoma were studied: Aurora, Echo, Heidi, Flamenco, Mermaid, LittleBell, Florida Pink. It was found that growing plants of Eystoma L. varieties on substrates increases the duration of flowering from 3.39 % to 8.96 %, and accelerates flowering by several days. The size of the flower is a characteristic feature of the Eustoma species. The larger the flower size, the better the growing conditions. Most Eustoma varieties are characterized by the formation of flowers with a relatively large diameter. As a result of growing Echo and Florida Pink varieties, the flower diameter was the smallest and amounted to only 5 cm and was 3 cm or 37% less than the flower diameter of Aurora. A slight increase in flower diameter, relative to Echo and Florida Pink, but less than Aurora, was found for Echo, Heidi, Mermaid and LittleBell. In these variants, the flower diameter was at the level of 6-7 cm. The large size of the flower and similar diameter relative to the control was characterized by the variety Flamenco. The flower diameter of this variety was 8 cm. The use of the Compo substrate for growing tall flowers gave the highest plant height of 98 cm (+18.8 %), and in the case of short flowers 15.3 cm (+15 %) relative to the substrates: Domoflor – 89.5 cm (+8.5 %) for tall varieties and 14.3 cm (+7.5 %) for short varieties, Peatfield – 91.2 cm (+10.6 %) for tall varieties and 14.3 cm (+7.5 %) for short varieties, and on the substrate Generous Earth the plant height was 88 cm (+6.6 %) for tall flowers and 14.3 cm (+7.5 %) for short varieties. Experiments have shown that the substrate does not have a significant effect on flower diameter, with the exception of the Compo. In this variant, an increase of +2.1 % was found in the overall study, while in other substrates the indicator increased only by +0.76 %. Despite the different plant heights, the number of peduncles and buds on the experimental plants was almost the same. Their total number was in the range of 25-34 pcs. The largest number of buds was characterized by the varieties Eustoma, Echo and Heidi. In these variants, the total number of buds was 33 pcs. The same number of buds was characterized by the varieties Flamenco, Mermaid and Little Bell. As a result of growing the Florida Pink variety, the number of buds was the smallest and amounted to only 25 pcs. In terms of substrate use, the best performance was characterized by the Compo substrate, which on average had 1 more bud than the control (+3.5 %), while other substrates had slightly lower rates of increase in the number of buds, where their value ranged from (1-2 %).

Multi‐Instruments Observation of Ionospheric‐Thermospheric Dynamic Coupling Over Mohe (53.5°N, 122.3°E) During the April 2023 Geomagnetic Storm

AbstractThe state and variations of the Ionosphere‐Thermosphere (I‐T) system are strongly influenced by dynamical processes, with these effects being amplified during intense space environment disturbances such as geomagnetic storms, producing multi‐scale disturbance features in the I‐T system. The redistribution of energy and momentum through the dynamical processes is currently not well understood. Unfortunately, the dearth of thermospheric observations has yielded limited studies capable of monitoring and analyzing the I‐T dynamical coupling during storms using co‐located measurements. This work examines the responses of the I‐T system during the April 2023 geomagnetic storm based on high‐resolution continuous I‐T system observations at Mohe observatory, a middle latitude station. Both large‐scale features and short‐period oscillations were identified in multiple key parameters of the I‐T system. Similar disturbed patterns in thermospheric winds occurred during the main and recovery phases of the geomagnetic storm. However, the oscillation features in many parameters of the I‐T system are only observed during the main phase. The results of concurrent I‐T system observations unveil the oscillation features of thermospheric winds, temperatures, the ionospheric F2 peak height, electron density, and total electron content. These findings reveal the important influence of wind divergence on thermospheric temperature disturbances and its modulatory effect on ionospheric disturbances.

Microstructure and properties of Ni-Ti based gradient laser cladding layer of Ti6Al4V alloy by laser powder bed fusion

An economical gradient layer was successfully prepared on Ti6Al4V alloy produced by laser powder bed fusion (L-PBF) using only composition design, gravity segregation, and laser cladding of micrometer-sized Ni powder, nanoscale SiC and Y2O3 powders. The microstructure of the layer was systematically studied to analyze the reasons for its improved wear and corrosion resistance. The results indicated that the cladding layer comprised top, middle, lower, and bottom layers. The main phases in top layer were Ti2Ni and β-Ti. Whereas the middle layer is composed of two regions, one with a similar structure to the top layer, and the other is the nickel-enriched area denoted as NEAm where the main phases were Ti2Ni, TiNi, and amorphous. The main phase of the lower layer was TiNi. Owing to the close distance between the bottom layer and the substrate, there was a significant increase of Ti in the bottom layer, and so the bottom layer and the top layer contained the same main phases. The soft phase of TiNi in lower layer would prevent the propagation of cracks that may occur in the top layer. The solidification and formation process of the gradient structure of the cladding layer was analyzed with Scheil model, and the simulation results were consistent with the experimental results. A nanocomposite system consisting of Ti3Si, α-Ti, and β-Ti was found for the first time in this study. The relationship between Ti3Si and α-Ti was coherent, and the relationship between α-Ti and β-Ti satisfied the Burgers orientation relationship. The mechanism of the nanocomposite system generation was that Si was enriched at the grain boundaries after the formation of Ti2Ni, where Ti and Si combined to form Ti3Si, and then Ti3Si was used as nucleating particles to form β-Ti/α-Ti. The α-Ti and β-Ti in the fusion line area at the bottom layer also satisfied the Burgers coherent relationship, indicating excellent bonding strength between cladding layer and substrate. A large number of solute atoms in the solid solution, pinning of second-phase particles, and the amorphous were the fundamental reasons for the substantial improvement in hardness and wear resistance. A small amount of Ni in the top layer increased the polarization of the cathodic reaction, keeping the corrosion current low. In addition, numerous dispersed fine phases in the top layer increased the resistance of charge transfer at the phase interfaces, which was the fundamental reason for the improved corrosion resistance.

The birth and early evolution of a low-mass protostar

Context. Understanding the collapse of dense molecular cloud cores to stellar densities and the subsequent evolution of the protostar is of importance to model the feedback effects such an object has on its surrounding environment, as well as describing the conditions with which it enters the stellar evolutionary track. This process is fundamentally multi-scale, both in density and in spatial extent, and requires the inclusion of complex physical processes such as self-gravity, turbulence, radiative transfer, and magnetic fields. As such, it necessitates the use of robust numerical simulations. Aims. We aim to model the birth and early evolution of a low-mass protostar. We also seek to describe the interior structure of the protostar and the radiative behavior of its accretion shock front. Methods. We carried out a high resolution numerical simulation of the collapse of a gravitationally unstable 1 M⊙ dense molecular cloud core to stellar densities using 3D radiation hydrodynamics under the gray flux-limited diffusion approximation. We followed the initial isothermal phase, the first adiabatic contraction, the second gravitational collapse triggered by the dissociation of H2 molecules, and ≈247 days of the subsequent main accretion phase. Results. We find that the subcritical radiative behavior of the protostar’s shock front causes it to swell as it accretes matter. We also find that the protostar is turbulent from the moment of its inception despite its radiative stability. This turbulence causes significant entropy mixing inside the protostar, which regulates the swelling. Furthermore, we find that the protostar is not fully ionized at birth, but the relative amount of ionized material within it increases as it accretes matter from its surroundings. Finally, we report in the appendix the results of the first 3D calculations involving a frequency-dependent treatment of radiative transfer, which has not produced any major differences with its gray counterpart.

Interpreting Convolutional Layers in DNN Model Based on Time–Frequency Representation of Emotional Speech

Abstract The paper describes the relations of speech signal representation in the layers of the convolutional neural network. Using activation maps determined by the Grad-CAM algorithm, energy distribution in the time–frequency space and their relationship with prosodic properties of the considered emotional utterances have been analysed. After preliminary experiments with the expressive speech classification task, we have selected the CQT-96 time–frequency representation. Also, we have used a custom CNN architecture with three convolutional layers in the main experimental phase of the study. Based on the performed analysis, we show the relationship between activation levels and changes in the voiced parts of the fundamental frequency trajectories. As a result, the relationships between the individual activation maps, energy distribution, and fundamental frequency trajectories for six emotional states were described. The results show that the convolutional neural network in the learning process uses similar fragments from time–frequency representation, which are also related to the prosodic properties of emotional speech utterances. We also analysed the relations of the obtained activation maps with time-domain envelopes. It allowed observing the importance of the speech signals energy in classifying individual emotional states. Finally, we compared the energy distribution of the CQT representation in relation to the regions’ energy overlapping with masks of individual emotional states. In the result, we obtained information on the variability of energy distributions in the selected signal representation speech for particular emotions.

Comparison of the Serum Protein Electrophoretic Pattern and Concentrations of Acute Phase Proteins in Bitches with and Without Mammary Gland Tumors

Abstract Alterations in the serum protein pattern may be associated with many diseases, including neoplastic processes. In veterinary medicine, these changes are poorly understood. Therefore, this study was aimed at the analysis of the distribution of blood serum protein fractions separated by agarose gel electrophoresis, and at the determination of the concentrations of main acute phase proteins in bitches with mammary gland neoplasia. The evaluation was conducted on twelve female dogs with palpable single or multiple nodules in the parenchyma of the mammary gland and on ten tumor-free clinically healthy bitches to compare the possible differences in the obtained results. Blood serum was used to perform agarose gel electrophoresis of the main blood serum protein fractions and to analyze the concentrations of total serum proteins and the following canine acute phase proteins: serum amyloid A, haptoglobin, C-reactive protein and α1-acid glycoprotein. The concentrations of total serum proteins were slightly higher in bitches with mammary gland tumors. Serum protein electrophoresis showed lower mean concentrations of albumin and α1-globulins in the affected dogs, while the concentrations of α2-and β1-globulins were significantly higher (P=0.0032 and P=0.0021, respectively) compared to dogs without mammary gland tumors. In the concentrations of acute phase proteins, significantly higher mean concentrations of C-reactive protein and haptoglobin were obtained in dogs with mammary tumors (P=0.0025 and P=0.0002, respectively). The values of α1-acid glycoprotein did not vary markedly between the bitches with and without mammary tumors. Presented data suggest that neoplastic processes in the mammary gland may also alter the electrophoretic pattern of blood serum proteins and induce changes in the production of some inflammatory proteins.

Influence of silanes on the hydration of cement by separating the cement into its individual phases

AbstractCementitious materials can be treated with organosilicon compounds (silanes) to achieve a water‐repellent effect. However, the influence of silanes on cement hydration is still not fully understood. For this reason, we studied the hydration of the main Portland cement phase (C3S ‐ tricalcium silicate) and the interaction with iBTES (isobutyltriethoxysilane), iOTES (isooctyltriethxysilane) and nOTES (n‐octyltriethoxysilane) by isothermal calorimetry and in‐situ X‐ray diffraction (XRD). The results show that C3S hydration is initially retarded and subsequently accelerated by iBTES and iOTES. In addition to the hydration process, the crystal growth of the portlandites (calcium hydroxide) is also affected by the silanes. The XRD results indicate that the portlandites grow significantly more plate‐like. In this context, the influence of the silanes on the portlandite crystallization was therefore also recorded in a special experimental setup. From the scanning electron microscope images it can be shown that all portlandite crystals grown in the presence of silanes have a platelike morphology. This is due to the fact that the hexagonal surfaces of the portlandite are covered by silanes and thus the growth direction of the crystals is affected. The modified portlandite crystals indicate that silanes also influence the microstructure of the cement paste and therefore its chemical and mechanical properties.

Evolutionary Phases of Big History

The present article is devoted to the issue of unity of laws, patterns and mechanisms of evolution at all its stages and levels of Big History and megaevolution. Despite the enormous differences between cosmic, planetological, chemical, biological, and social evolutions, there are many similarities. There are a lot of important and insightful works on the development of complexity in our Universe and in the course of Big History. Unfortunately, much less studies are devoted to analysis of universal similarities, patterns and rules within Big History. Mostly such research is focused on a few laws of Big History which are usually connected with development of complexity. However, laws in terms of the typological similarity of many patterns and rules in star-galaxy, planetological, chemical, biological and social phases of Big History, are of great importance. In the present article we will consider a number of such important similarities, which, in our opinion, clearly demonstrate the systemic-structural and functional-evolutionary unity of the world at its different levels and in different areas. The understanding of these similarities deepens our perception about all stages of Big History and its regularities, and leads us away from the false idea that social evolution in all aspects is different from the evolution of previous levels. In the first section our key goal is to give our own definitions of evolution which would cover as many variants of evolutionary changes as possible. In the second section we will try to give a rather voluminous and dialectical picture of the unfolding universal evolution instead of a short scheme: cosmic – biological – social. The notions of main and transitional phases of Big History are introduced; and the importance of its planetary and chemical phases is shown. In the third section we will show that one can reveal a number of similarities at all levels and phases of megaevolution, which can be generalized in universal laws, rules, mechanisms, patterns and principles of evolution. One should note that in fact none of the important laws and principles, not any of the important rules of evolution, have been ‘lost’ in the process of transition from lower to higher levels. They were only modified and became more complicated, and there also appeared some new principles and rules (and in retrospect one can see their rudiments at the lowest levels of evolution). Some of these laws and rules are described in this section. In the fourth section we will try to present some evolutionary and philosophical ideas that explain the profound similarity in the laws and patterns of megaevolution at all its levels and phases. In the conclusion we will discuss evolutionary and non-evolutionary matters.

&lt;p&gt;Situated goals questionnaire transcultural adjustment and validation: comparison between Colombian and Spanish students&lt;/p&gt;

Introduction. This research aims to adjust and validate the Situated Goals Questionnaire to the Colombian higher education population and compare the results with those obtained previously in the Spanish population Method. A total of 500 university students from the Faculty of Education of the National Pedagogic University of Colombia participated. Four Confirmatory Factor Analysis were made to identify the factorial validity of the Situated Goal Questionnaire for the University population: 1) original model with a subsample 2) original model cross-validation analysis between two subsamples, 3) multi-group analysis between the two main phases of career 4) multi-group analysis between Colombian and Spain sample. Six regression analyses using the class's final grade as a predictive variable were made to identify predictive validity. Results. As a result, the adjusted questionnaire has good fit and reliability values. The aspects that predicts performance is the desire to learn positively; whereas, the desire to pass the class affects it negatively. The main difference between Colombian and Spanish students is that the former have a more significant relationship with the desire to pass in the performance orientation. Discussion and Conclusion. SGQ-U is a good tool for teachers to identify the activities and their impact. The type of academic task the teacher uses in the classroom influences the student' specific goals. Besides, the students differ also in their sensitivity to different academic tasks. These differences show that it is essential to consider how teachers select and use academic tasks in the classroom.

A Bogue approach applied to BOF slag

AbstractAn industrial by‐product of the steel industry called basic oxygen furnace (BOF) slag has recently undergone extensive research for high‐end applications outside of road load and landfill. In contrast to the Bogue methodology used with regular Portland cement, BOF slag lacks a quick and straightforward quantitative phase analysis procedure that would allow it to be employed as a high‐end raw material. The main phases of BOF slag (C2S, C2(A,F), Ff, RO‐Phase, and f‐C) can be calculated using the method presented in this paper based on chemical composition.

“I Had No Childhood”: A Trauma History of Deported Ukrainians from Western Boykivshchyna

Abstract The article is devoted to the trauma history of Ukrainians from Western Boykivshchyna, part of the Boykivshchyna ethnographical region situated in modern Ukraine. Operation Vistula (1947–1950) was the forced resettlement of more than 150,000 Ukrainians and mixed Polish-Ukrainian families from the territory of Rzeszów, Lublin and Kraków provinces (Voivodeships) to the western and northern territories of Poland, leading to radical changes within this regional group. The article deals with the difficult experience of the resettlers not only in the context of psychological, but also cultural, trauma. According to the theory of Polish sociologist Piotr Sztompka, three main phases of cultural trauma induced by resettlement have been highlighted and are outlined as strategies to cope with trauma: contemporary resettlers’ preservation of native culture, religion and family tradition, and sharing memories of the past.

The Relation Among the Ring Current, Subauroral Polarization Stream, and the Geospace Plume: MAGE Simulation of the 31 March 2001 Super Storm

AbstractThe geospace plume, referring to the combined processes of the plasmaspheric and the ionospheric storm‐enhanced density (SED)/total electron content (TEC) plumes, is one of the unique features of geomagnetic storms. The apparent spatial overlap and joint temporal evolution between the plasmaspheric plume and the equatorial mapping of the SED/TEC plume indicate strong magnetospheric‐ionospheric coupling. However, a systematic modeling study of the factors contributing to geospace plume development has not yet been performed due to the lack of a sufficiently comprehensive model including all the relevant physical processes. In this paper, we present a numerical simulation of the geospace plume in the 31 March 2001 storm using the Multiscale Atmosphere‐Geospace Environment model. The simulation reproduces the observed linkage of the two plumes, which, we interpret as a result of both being driven by the electric field that maps between the magnetosphere and the ionosphere. The model predicts two velocity channels of sunward plasma drift at different latitudes in the dusk sector during the storm main phase, which are identified as the sub‐auroral polarization stream (subauroral polarization streams (SAPS)) and the convection return flow, respectively. The SAPS is responsible for the erosion of the plasmasphere plume and contributes to the ionospheric TEC depletion in the midlatitude trough region. We further find the spatial distributions of the magnetospheric ring current ions and electrons, determined by a delicate balance of the energy‐dependent gradient/curvature drifts and the E × B drifts, are crucial to sustain the SAPS electric field that shapes the geospace plume throughout the storm main phase.