Recovery of Paleodictyon patterns after simulated mining activity on Pacific nodule fields

Since the late 1980s, various experiments have been conducted in polymetallic nodule fields of the Pacific Ocean to assess the potential environmental impacts of future mining, specifically in two areas: the Peru Basin and the Clarion-Clipperton Fracture Zone (CCZ). Two expeditions, SO242/2 in 2015 (Peru Basin) and SO268/1 + 2 in 2019 (CCZ), deployed a towed camera system to collect imagery from both areas. These expeditions aimed to assess recovery of fauna in the short (few weeks) and long term (several years) following physical seafloor disturbance actions designed to mimic potential mining, by ploughs, dredges and epibenthic sleds. Within the collected image data, several strikingly hexagonal hole patterns were observed and identified as Paleodictyon nodosum, and an irregular form of Paleodictyon traces, both on undisturbed and disturbed areas of seafloor. Recent forms occur abundantly in various deep-sea regions, but their origin, and how they represent the mode of life of the forming organism, remains unknown. In this study, the imaged occurrences of Paleodictyon traces on disturbed seafloor sheds light on the lifecycle of the forming organism, demonstrating that they can recolonize disturbed habitat and produce the trace network in a few weeks. Nevertheless, the density of these patterns on disturbed substrates was lower than observed on undisturbed substrates in both nodule regions. We therefore hypothesize that, along with other benthic deep-sea fauna, these structures and the forming organism are impacted by physical seafloor disturbance, and even 26 years after disturbance, densities on disturbed sediments have not recovered to undisturbed levels.

Grade 10 English First Additional Language Learners’ Strategies For Past Tense Irregular Verb Inflection Mastery

<p class="Default"><strong>Abstract.</strong><strong> </strong>The mastery of the irregular form of verbs in the past simple tense poses challenges to non-native learners of English all over the world. The objectives of this study were to identify the types of learners’ strategies useful for mastering the irregular verb inflection, to describe and evaluate them, and to establish why the English First Additional Language learners face difficulties in mastering those strategies. The study followed a quantitative research design. A questionnaire was used as an instrument for data collection from the respondents. Data were analysed using the Statistical Package for Social Sciences version 22 to ensure valid interpretations. Subsequent themes were placed in a table and a graph dealing with the inflection of irregular verbs. The target group of this study comprised 21 Grade 10 learners who were attending Dimani Secondary School in Limpopo Province, South Africa during the academic year 2021. From the data analysis, the initial study findings established that the respondents were incompetent in mastering the inflection of irregular verbs in the past simple tense when using the suppletion principle and the terminal consonants phoneme changes. The researchers used the grouping of common irregular verbs and the learning of irregular verbs in sentences strategies because learners were different and learned irregular verb inflection differently. Although it was previously found that learners could not understand the inflection of irregular verbs in the past simple tense, after having utilised these two strategies, the inflection of irregular verbs in the past simple tense improved with tremendous results.</p><p class="Default"> </p><p>Keywords: Inflection; irregular verbs; past simple tense; strategies<em></em></p>

Confirmation of species independence and affinity of Musa huangbaioa (Musaceae) – rare endemic banana of China – according to the molecular phylogenetic data

In this article, we research the phylogenetic position of the rare endemic banana, Musa huangbaioa, which was described only in Chinese journal in 1987. This banana was found at the foot of the Mount Emei in Sichuan Province and has remarkable morphological features, e. g., undulated petiole margins, ribbed fruits and irregular form of the seeds, which are rather unusual in the genus and distinguish it from all other species. In addition, due to its uncertain affinity, we researched the position of M. huangbaioa in the Musaceae family with the aid of molecular phylogenetic analysis of two marker sequences, nrITS and trnL–trnF. We found that this species belongs to the large and rather complicated group of Chinese bananas, M. basjoo–M. itinerans clade. According to the ITS data, M. huangbaioa is monophyletic with one M. basjoo specimen that was cultivated in Central America. Probably, this fact represents that this species can be modern hybrid with one of the genomes inherited from M. basjoo s. l. The whole group M. basjoo–M. itinerans, which M. huangbaioa belongs to, is well separated within the sect. Musa and could be prone to frequent hybridizations in the natural environment; it requires an additional research for more precise differentiation of the group.

Addition of Calcined Na2B4O7 on the Synthesis of Li7La3Zr2O12

Li7La3Zr2O12 (LLZO) is a garnet-type electrolyte for all-solid-state lithium-ion batteries (ASSB). It has good chemical and electrochemical stability against lithium and a relatively high ionic conductivity. However, the ionic conductivity needs to be further increased to provide a high specific capacity of the ASSB. Element doping into LLZO is an effort to increase molecular defect, known to enhance the conductivity. This research studied the effect of the Na2B4O7 addition on the LLZO synthesis, producing LLZBO(A). The investigation aims to understand whether the sodium ions dope into the LLZO structure during synthesis, or it is only B ions to enter into the structure. Therefore, another synthesis with B2O3 of B precursor was conducted for comparison (LLZBO(B)). The precursors were mixed stoichiometrically by following the formula of Li7-xLa3-xZr2-xBxNaxO12 (LLZBO, x= 0.15; 0.20; 0.30). XRD analysis equipped with Le Bail refinement found that LLZBO(A) and LLZBO(B) mainly consist of cubic and tetragonal LLZO with a %mol of 69.06 – 69.84 %, and the main secondary phase is La2Zr2O7. The surface morphology of LLZBO(A) and LLZBO(B) is almost similar to the irregular form of large aggregates. The particles become more dispersed when 0.3 %mol dopant was submitted. Impedance analysis found a high ionic conductivity of LLZBAO(A)0.3 1.042x10-3 Scm-1.

Numerical Simulation of Macrosegregation Formation in a 2.45 ton Steel Ingot Using a Three-Phase Equiaxed Solidification Model

In the present work macrosegregation during solidification of a 2.45 ton steel ingot is simulated with a pure equiaxed model, which was tested previously via modeling of a benchmark experiment. While the columnar structure is not taken into account, a packed layer formed over inner walls of the mold at an early stage of solidification reproduces to some extent phenomena generally related to zones of columnar dendrites. Furthermore, it is demonstrated that interaction of free-floating equiaxed grains with ascending convective flow in the bulk liquid results in flow instabilities. This defines the irregular form of the negative segregation zone, the formation of which at the ingot bottom corresponds to experimental observation. Vertical channels reported in experimental measurements are reproduced in simulations. It is confirmed that intensification of ingot cooling may decrease segregation in the ingot.

Mass splitting in an 331-TC coupled scenario

The root of most of the technicolor (TC) problems lies in the way the ordinary fermions acquire their masses, where an ordinary fermion [Formula: see text] couples to a technifermion [Formula: see text] mediated by an extended technicolor (ETC) boson leading to fermion masses that vary with the ETC mass scale [Formula: see text] as [Formula: see text]. Recently, we discussed a new approach consisting of models where TC and QCD are coupled through a larger theory, in this case the solutions of these equations are modified compared to those of the isolated equations, and TC and QCD self-energies are of the irregular form, which allows us to build models where ETC boson masses can be pushed to very high energies. In this work we extend these results for 331-TC models, in particular considering a coupled system of Schwinger–Dyson equations, we show that all technifermions of the model exhibit the same asymptotic behavior for TC self-energies. As an application we discuss how the mass splitting of the order [Formula: see text](100) GeV could be generated between the second and third generation of fermions.

DOUBLE SUBSTITUTED CARBONATED HYDROXYAPATITE FOR STONE CONSOLIDATION

This paper aims with the preparation of Sr2+ and Zn2+ double substituted carbonated hydroxyapatite (Sr-Zn-CHAp) by the nanoemulsion method and to evaluate its consolidation capacity on artificial stone samples. The changes in CHAp lattice parameters were observed by a synergy between the shrinkage and dilatation induced by the two metallic ions, with different ionic radii by comparison with calcium. The changed morphology obtained by calcination was evidenced by SEM analysis. Also, the tendency to agglomerate of the double substituted CHAp as micron- and sub-micron-sized particles with spherical and irregular form was observed. The FTIR, XRD and EDS results confirmed that the CHAp was successfully substituted with Sr2+ and Zn2+ by replacing Ca2+ resulting a AB-type CHAp. The efficacity of Sr-Zn-CHAp as inorganic consolidant for the stone was tested by mechanical strength, resistance at freeze–thaw artificial aging test, thermal shock weathering, colorimetric changes of the artificial stone sample, all the results being correlated with the water absorption test, water repellency, and pore structure changes. By treating the stone with 0.5 g/L Sr-Zn-CHAp led to an improvement of the above-mentioned characteristics, without significant chromatic changes.

Spanish quepo: the untold story

The pres. ind. paradigm of Sp. caber ‘to fit’ exhibits a synchronically irregular form in the 1st pers. sg., i.e., quepo, instead of a synchronically regular form derived from the infinitive, i.e., caber → *cabo. However, quepo is not considered at all historically irregular. Since the first historical grammar of Spanish, quepo has been understood to be a direct continuation of Lat. capiō, which apparently evolved through regular phonetic development, like pres. subj. capiam > quepa, sapiam > sepa. Nonetheless, one may question why quepo has not been replaced by *cabo in Modern Spanish given its extremely low frequency of occurrence, as forms of a language that occur infrequently are often regularized. A historical look at quepo reveals the following surprising facts: (1) Although pres. subj. quepa is attested from the earliest Old Spanish texts onward, quepo is absent from the written record throughout the Old and Medieval Spanish periods and does not appear until the end of the sixteenth century; (2) Regularized cabo served as the first person singular of the present indicative until then. The present study attempts to explain through well-established processes of historical morphology the late appearance of quepo and its continued existence in Modern Spanish.

The Students’ Ability on Comparison Degree in Irregular Form

The study is designed to investigate the students’ ability in using comparison degree on learning English especially in using irregular forms. To look their understanding about this matery the writer used method design descriptive design. Comparison degree was a compare between noun, people, and animal. Comparison degree has three type that was positive degree, comparative degree, and superlative degree. In taked the data of this study, the writer especially in taked data of comparative degree and superlative degree but just irregular forms. The sampling of data, the writer choose the students of the first grade at Madrasah Aliyah Muhammadiyah Aimas of number 20 person. The writer used written test as tools to take the data that was multiple-choise of number eighteen comparative degree and seventeen to superlative degree. Before doing research, the writer explains about comparison degree in irregular forms to the students and then the writer given tast about comparative degree in irregular forms to the students. First step done the author was giving material of paper to students about comparison degree in irregular form and both steps given the students exercise about matery had given as multiple-chooise. After that, exercise correct and analyze. By this test given by the author getting the data for her research. From 12 students of first grade at Madrasah Aliyah Muhammadiyah Aimas got score, to comparative degree in worse = 69%, better = 62%, farther = 85%, less = 69%, more = 96%, elder = 7,7%. Commonly, their ability can be seen based on the score of test, in which they got their mean of score of test was 47%. The writer can explain that the students of the first grade at Madrasah Aliyah Muhammadiyah Aimas yet understand about comparative degree, their ability was still including in bad category, and superlative degree specifically on worst = 65%, best = 50%, farthest = 23%, least = 8%, most = 31%, Eldest = 89%. In overall, can be seen their mean score of superlative degree = 32%. It means that their ability in superlative degree was very bad. By this result, the writer found that the students understanding on superlative degree was still very minus.

Addition of MnO2 in synthesis of nano-rod erdite promoted tetracycline adsorption

Erdite is a rare sulphide mineral found in mafic and alkaline rocks. Only weakly crystallised fibrous erdite has been artificially synthesised via evaporation or the hydrothermal method, and the process generally requires 1–3 days and large amounts of energy to complete. In this study, well-crystallised erdite nanorods were produced within 3 h by using MnO2 as an auxiliary reagent in a one-step hydrothermal method. Results showed that erdite could synthesised in nanorod form with a diameter of approximately 200 nm and lengths of 0.5–3 μm by adding MnO2; moreover, the crystals grew with increasing MnO2 addition. Without MnO2, erdite particles were generated in irregular form. The capacity of the erdite nanorods for tetracycline (TC) adsorption was 2613.3 mg/g, which is higher than those of irregular erdite and other reported adsorbents. The major adsorption mechanism of the crystals involves a coordinating reaction between the −NH2 group of TC and the hydroxyl group of Fe oxyhydroxide produced from erdite hydrolysis. To the best of our knowledge, this study is the first to synthesise erdite nanorods and use them in TC adsorption. Erdite nanorods may be developed as a new material in the treatment of TC-containing wastewater.