bluuebunny/crossref_metadata_2025_split huggingface dataset:
Production and Properties of Magnesium Potassium Phosphate Cements Containing Ash and Metallurgical Slag Additives for Radioactive Waste Immobilization
Authors: Sayenko S. , Shkuropatenko V. , Pylypenko O. , Kholomieiev H. , Karsim S. , Zykova А. 
Published: June 2023

Magnesium potassium phosphate cements (MKPCs) are currently considered as the matrix materials for immobilization of radioactive waste of low and medium activity, as an alternative to Portland cements. At the same time, MKPC compound has the following advantages: fast hardening, high early strength, low shrinkage and high chemical resistance. Magnesium potassium phosphate cement is prepared at room temperature by an acid-base reaction between calcined magnesium oxide (MgO), potassium dihydrogen phosphate (KH2PO4) and water to form magnesium potassium phosphate hexahydrate MgKPO4 ∙ 6H2O known as K-struvite. To obtain MKPC, starting components of high purity and, accordingly, high cost are required. From an industrial point of view, this leads to an excessive price of the final product, and therefore, the use of inexpensive industrial waste as cement fillers is economically cost effective.
In the present paper, the effect of fly ash and blast-furnace slag additives on the microstructure, compressive strength, and chemical resistance of MKPC samples was studied. The results indicate that particles of both ash and blast-furnace slag are involved in the reaction of MKPC obtaining with the formation of predominantly crystalline K-struvite. According to X-ray diffraction analysis, the content of K-struvite in samples with additives of both fly ash and blast-furnace slag is almost the same and amounts to 58–60 %. With the same addition of filler, samples with the addition of blast-furnace slag have a denser structure, which is formed due to the increased reactivity of blast-furnace slag particles. Moreover, MKPC samples with the addition of blast-furnace slag exhibit higher strength and better chemical resistance to leaching compared to MKPC samples with fly ash additions. The obtained results demonstrate the prospects of using industrial waste additives in the production of MKPC compounds characterized by high mechanical strength and chemical resistance.
Дослідження різних видів бетонів для біологічного захисту контейнерів HI-STORM від фотонного випромінювання
Authors: Romanenko I. , Trofymenko O. , Nosovskyi А. 
Published: June 2023

Описано новий композитний матеріал для радіаційного захисту від фотонного випромінювання на основі важкого бетону, армованого базальт-борною фіброю, який може бути застосований у біологічному захисті контейнерів HI-STORM для зберігання відпрацьованого ядерного палива. Виконано моделювання проходження фотонного випромінювання в цьому матеріалі за допомогою Монте-Карло коду Serpent. Розглянуто два процеси. Перший процес – проходження первинних фотонів у бетоні біологічного захисту від гомогенізованого джерела випромінювання фотонів відпрацьованого ядерного палива. Другий процес – визначення вторинних фотонів, що утворилися внаслідок поглинання та непружного розсіювання первинних нейтронів у бетоні біологічного захисту від гомогенізованого джерела випромінювання. У першому та другому процесах досліджувалися два типи важкого бетону: бетон з гранітним щебнем та бетон з базальтовим щебнем. До бетону з гранітним щебнем додавалися два типи базальт-борної фібри з різними концентраціями оксиду бору. Перший тип базальтової фібри містить 5 % маси B2O3 і 95 % маси базальту. Другий тип базальтової фібри містить 10 % B2O3 і 90 % базальту. На один метр кубічний бетону з гранітним щебнем додавалося від 1 кг до 20 кг базальт-борної фібри. Методом Монте-Карло виконано моделювання процесу радіаційного поглинання нейтронів з подальшим утворенням та проходженням фотонів через бетон біологічного захисту контейнера HI-STORM.
Проаналізовано захисні властивості бетону з додаванням базальтової фібри та різним масовим вмістом оксиду бору (5 % і 10 %).
Модифіковані склади бетону мають більше переваг порівняно зі звичайним бетоном. Продемонстровано, що для покращення захисних властивостей від фотонного випромінювання в бетон доцільно додавати наповнювач з більшою густиною. Також запропонована, як композитний матеріал, базальт-борна фібра, яка має значний потенціал та може бути використана в атомній енергетиці для покращення захисних властивостей біологічного захисту контейнерів зберігання відпрацьованого ядерного палива.
Weighing up the Effect of Contextual Cues in Learning English Phrasal Verbs: Is Context the Answer to Avoidance?
Authors: Alhatmi Sultan 
Published: June 2023

Research on English phrasal verbs indicates that these lexical units are problematic and hence difficult to deal with by EFL learners. Thus, one common strategy learners use when encountering phrasal verbs is avoidance: i.e. simply to avoid decoding them in spoken or written content as well as avoid using them in their own speech or writing. This study examines whether contextual cues, i.e. written or spoken context surrounding phrasal verbs, could be of any help to EFL learners in dealing with such lexical units both in receptive and productive tasks. A total of 60 English majors at King Abdulaziz University sat at two separate testing sessions in which they were tested on their recognition as well as recall of 30 preselected unknown English phrasal verbs. Using a between-groups design, the subjects were randomly allocated to three intact groups based on the amount of phrasal verb contextual cues they were exposed to during the first testing session: no contextual cues (control group), sentential-level cues (treatment group 1), and paragraph-level cues (treatment group 2). A receptive multiple-choice test on the target phrasal verbs was conducted during the first session followed by a productive fill-in-the-blank cloze test on the second session. The results of one-way between-groups ANOVA indicate that the paragraph-level cues group outperformed both the no contextual cues group as well as the sentential-level cues one on the receptive measure. However, none of the three groups exhibited any significant differences in their performance on the productive measure. These findings emphasize the role of contextual cues in decoding English phrasal verbs in the receptive mode (i.e. during listening or reading tasks) but call for exploring alternative routes to contextual cues in aiding EFL learners’ use of these lexical units in the productive mode (i.e. during speech or writing tasks).
use of (K.W.L.H) strategy in improving reading comprehension skills in the Arabic language course among tenth grade students in the United Arab Emirates
Authors: Alkasasbeh Khaled Abdelmahdi Salameh , Mohamed Yuslina , Ismail Sulaiman 
Published: June 2023

هدفت الدراسة إلى تقصي أثر (KWLH) في تحسين مهارات الفهم القرائي في اللغة العربية لدى طلاب الصف العاشر في دولة الإمارات العربية المتحدة. لتحقيق أهداف الدراسة والإجابة على تساؤلاتها يتبع الباحث المنهج شبه التجريبي. تحقق من صحتها وموثوقيتها. تم تدريس (30) طالبًا باستخدام إستراتيجية الجدولة الذاتية ، ومجموعة أخرى من (30 طالبًا سيتم تدريسهم بالطريقة المعتادة ، وبذلك يكون العدد الإجمالي لعينة الدراسة (60 طالبًا من الصف العاشر). ثم يتم إجراء الاختبار البعدي لمهارات الفهم القرائي ، وفي ضوء النتائج المتوقعة التي سيصل إليها الباحث ، وهي وجود فروق ذات دلالة إحصائية لصالح استراتيجية (KWLH) مقارنة بالطريقة التقليدية.
الكلمات المفتاحية: استراتيجية (KWLH) والفهم القرائي النقدي
LA CIENCIA DEL DISEÑO PARA VALORAR LA INNOVACIÓN DEL ESPACIO PÚBLICO DE ESPARCIMIENTO
Authors: Gómez-Vera Laura Teresa 
Published: June 2023

Este artículo de investigación presenta, bajo un contexto en donde premia la incertidumbre del nivel de innovación en el diseño de los espacios públicos de esparcimiento, una herramienta para medir el desempeño de dichos sitios. Se propone que su valoración esté mediada por la capacidad de ordenación, de accesibilidad, de adaptación y de percepción. Para ello, debe contar con el apoyo de indicadores estructurados, según el conjunto de requerimientos de uso, de función, de estructura y de forma. Se abordaron las fases de exploración teórica y de categorización que determinaron los atributos de innovación desde las proyecciones estratégica y sustentable, así como el valor para ponderar los resultados que se obtengan en cada intervención. En síntesis, se deriva un grupo de ocho indicadores que son útiles para medir el grado de novedad y desempeño de los espacios públicos de esparcimiento con respecto a su conceptualización y a su desarrollo proyectual. Se busca, asimismo, fomentar que el impacto social que estos sitios tienen frente a su representación inclusiva sea identificado.
Palabras clave: Innovación, espacio público, indicador, requerimiento de diseño.AbstractIn a context where uncertainty exists about the level of innovation in the design of public recreational spaces are visible, and this research article presents a tool to measure the performance of those sites. It is proposed that its assessment should be mediated by the capacity for ordering, accessibility, adaptation and perception. As well, the support of indicators that are structured according to the set of requirements for use, function, structure, and form is needed. The theoretical exploration and categorization phases were addressed, determining the innovation attributes from the strategic and sustainable projections, as well as the value of weighing the results obtained in each intervention. In summary, a group of eight indicators is derived that are useful to measure the degree of novelty and performance of public recreational spaces with respect to their conceptualization and project development. It also seeks to promote the social impact that these sites bias against inclusive representation should be identified.Keywords: Innovation, public space, indicator, requirement of design.
Ochrona danych osobowych jako element oceny etycznej badań naukowych z udziałem ludzi
Authors: Jagielski Mariusz 
Published: June 2023

Celem artykułu jest wyjaśnienie wzajemnych relacji pomiędzy oceną etyczną badań naukowych z wykorzystaniem danych osobowych i oceną spełnienia wymogów prawa ochrony danych osobowych. Artykuł przedstawia wzajemne relacje pomiędzy ochroną danych osobowych a działalnością naukową z perspektywy dogmatycznej, prawną regulację przetwarzania danych osobowych w badaniach naukowych, w tym tzw. wyjątki badawcze, które znajdą zastosowanie w przypadku, gdy dane będą przetwarzane do celów badań naukowych, zagadnienie znaczenia spełnienia wymagań etycznych badań naukowych z perspektywy możliwości skorzystania ze wskazanych wyjątków oraz porównanie etycznego i prawnego reżimu ochrony danych osobowych w badaniach (cele, kryteria, organy i procedury).
Clinical stigmas of irritable bowel syndrome associated with obesity and overweight
Authors: Fedorin M. M. , Livzan M. A. , Gaus O. V. 
Published: June 2023

Objective. To identify clinical stigmas and eating habits of patients with irritable bowel syndrome (IBS) against the background of overweight and obesity in order to improve the effectiveness of management of this cohort of patients.Material and methods. Open cross-sectional cohort study with 175 participants aged 18 to 44 years (mean age 30,06 ± 6,15 years) was carried out. Group 1 included 100 obese or overweight IBS patients aged 18 to 44 years (mean age 30.63 ± 6.37 years, BMI 25.88 ± 6.28 kg/m2). In group 1, subgroup 1A included 50 people with IBS associated with overweight or obesity. Subgroup 1B included 50 IBS patients with normal weight. Group 2 included 75 people without IBS, aged 19 to 43 years (mean age 29.31 ± 5.81 years, BMI 27.80 ± 6.20 kg/m2). Subgroup 2A included 50 participants without IBS who were overweight or obese. Subgroup 2B included 25 conditionally healthy participants. IBS symptoms were assessed using a 10-point scale. The severity of gastrointestinal symptoms, the presence of anxiety and depression, the level of speciﬁc anxiety, quality of life, and eating habits were assessed using veriﬁed questionnaires.Results. Patients suffering from IBS associated with obesity and overweight have characteristic clinical stigmas, namely: IBS with predominant constipation, severe course of IBS, depressive and anxiety disorders, eating habits characterized by predominance of ﬂoury, sweet, fatty and salty foods in the diet, and low intake of fruits and vegetables containing dietary ﬁber.Conclusions. The identiﬁed clinical stigmas suggest the presence of a portrait of an IBS patient with excessive body weight or obesity, which creates the need to elucidate the mechanisms of IBS formation and progression in overweight and obese individuals.
Evaluation of microbiological efﬁciency of use of pulsed ultraviolet devices in medical organization
Authors: Nabieva A. S. , Aslanov B. I. , Kolosovskaya E. N. , Puzyrev V. G. , Usenko V. V. , Ignatova O. K. 
Published: June 2023

Objective. To study bactericidal effect of continuous spectrum ultraviolet radiation on hospital ﬂora and evaluate microbiological efﬁciency of using portable pulsed ultraviolet unit for disinfection of air and open surfaces in a medical organization. During the study, it was found that the selected research methods probably did not allow to achieve higher values of disinfection efﬁciency in shorter processing times.Materials and methods. The strains of microorganisms that were used for the study were taken from various loci from patients of the department of anesthesiology and intensive care for children with cardiac pathology on the ﬁrst day of their transfer from various medical organizations, as well as museum strains from the collection of microorganisms of the laboratory. Single-use plastic Petri dishes with nutrient media in the laboratory were artiﬁcially contaminated with test strains. Air samples were taken during the work shift by aspiration using a Krotov’s apparatus. Wipes were taken with a sterile cotton swab dipped in nutrient medium.Results. No colonies of multiresistant K. pneumoniae, S. aureus, E. coli were detected in the samples as a result of exposure to a pulsed ultraviolet radiation source in a mode № 1; the efﬁciency of the action was 99.9–100%. With the regimen № 2 the efﬁcacy was 83.33–99.9%. Assessment of microbiological efﬁciency of the disinfected open surfaces and air in a small operating room and a dressing room showed that the level of air contamination did not exceed the permissible level.Conclusions. It has been experimentally proved that pulsed UV radiation of broadband spectrum has high bactericidal activity against microorganisms of hospital environments.
Youths as recipients and providers of agriculture information – the vertical vegetable gardening case in Busia County, Kenya
Authors: Avoga Tabitha , Ombati Justus M. , Mwonga Samuel M. , Waswa Lydia , Fischer Sahrah , Hilger Thomas 
Published: June 2023

The intent of this study was to assess the feasibility of engaging youths in secondary schools in disseminating agricultural information among smallholder farmers using a five-month vertical vegetable gardening technology case in Busia County, Kenya. The research employed mixed research design targeting smallholder farmers and youths in secondary schools. A sample of 132 smallholder farmers and 132 youths in their first, second, and third years of study were selected to participate in the study at the baseline survey, during the intervention, and at the closure survey. The baseline survey was used to identify gaps, followed by participatory training intervention on the mound bed, primary tower, and second wall, to create awareness about vertical vegetable gardening through young farmers' clubs, and a closure survey to assess the change caused by the intervention and the feasibility of the approach. The study used kales, black nightshade, swiss chard, capsicum and carrots as examples of vegetables suitable for vertical gardens. Data was analyzed using the Wilcoxon sign-rank test at p0.05 level of significance, thematic and descriptive analysis. The results showed that there was a significant change in access and use of vertical gardening information by smallholder farmers. At P = 0.000, 22% of the smallholder farmers appreciated the use of vertical vegetable gardening at the closure survey, compared to 1% at the baseline survey. The dissemination of information through secondary school youths allowed for multiple delivery channels, was a good technology result demonstration approach for technology replication, and had sufficient agricultural extension activity learning scope. Significant change in the level of technology acceptance offer practical implications for policy makers to support the role of youths in agricultural extension. Future studies are needed to examine suitable agricultural extension policies and strategies to increase the successful implementation of agricultural extension through secondary schools.
Effects of bubble cutting dynamic behaviors on microalgal growth in bubble column photobioreactor with a novel aeration device
Authors: Zhao Sha , Feng Wenyue , Li Jinming , Zhang Xiaoguang , Liu Li , Li Hongyan 
Published: June 2023

Introduction: Carbon sequestration by microalgae is an effective approach for achieving carbon neutrality owing to its high carbon capture efficiency and environmental friendliness. To improve microalgae CO2 fixation efficiency, various methods to enhance CO2 transfer at the gas-liquid interface have resulted in high energy consumption.Methods: In this study, a novel aeration device with bubble cutting slices was installed in a photobioreactor for CO2 supply, which could precisely separate bubbles into sizes on the way to rising after departure, achieving CO2 transfer enhancement without extra energy consumption. Subsequently, the bubble cutting dynamic behaviors in the photobioreactor were studied, and the effects of thickness, hydrophilicity, and arrangement of cutting slices on microalgal growth were analyzed.Results: It was found that bubble cutting caused the maximum dry weight and biomass productivity of microalgae to improve by 6.99% and 33.33%, respectively, compared with those of the bioreactor without cutting units, owing to a 27.97% and 46.88% decrease in bubble size and rising velocity, respectively, and an 84.55% prolongation of bubble residence time.Discussion: Parallel cut slices with a thickness and spacing of less than 3 mm successfully cut the bubbles. The hydrophobic slice surface prevented daughter bubble departure and prolonged the bubble residence time, impeding microalgae growth owing to bubble coalescence with subsequent bubbles. The optimal cutting slice parameters and culture conditions for microalgal growth were 1 mm slice thickness, less than 1 mm slice spacing, 5% inlet CO2 concentration, and 70 mL/min gas flow rate.
Fate of the distal aorta following root replacement in Marfan syndrome: a propensity score matched study
Authors: Liu Hao , Chen Suwei , Luo Congcong , Zhong Yongliang , Qiao Zhiyu , Sun Lizhong , Zhu Junming 
Published: June 2023

ObjectiveThe aortic root is the most frequent segment involved in Marfan syndrome. However, Marfan syndrome is a systemic hereditary connective tissue disorder, and knowledge regarding the outcomes of the native distal aorta after prophylactic aortic root surgery is limited.MethodsFrom April 2010 to December 2020, 226 patients with Marfan syndrome and 1,200 patients without Marfan syndrome who underwent Bentall procedures were included in this study. By propensity score matching, 134 patients were assigned to each group. Clinical manifestations and follow-up data were acquired from hospital records and telephone contact. The cumulative incidence of aortic events was estimated in Marfan and non-Marfan patients with death as a competing risk.ResultsPatients with and without Marfan syndrome had similar baseline characteristics after propensity score matching. Differences in the aortic root (62.25 ± 11.96 vs. 54.03 ± 13.76, P &lt; .001) and ascending aorta (37.71 ± 9.86 vs. 48.16 ± 16.01, P &lt; .001) remained after matching. No difference was observed in the frequency of aortic adverse events between the two groups (10.5% vs. 4.6%, P = 0.106). The cumulative incidence of aortic events was not different between Marfan and non-Marfan patients (15.03% ± 4.72% vs. 4.18% ± 2.06%, P = 0.147). Multivariate Cox regression indicated no significant impact of Marfan syndrome on distal aortic events (HR: 1.172, 95% CI: 0.263–5.230, P = 0.835). Descending and abdominal aortic diameter above normal at the initial procedure were associated with the risk of distal aortic events (HR: 20.735, P = .003, HR: 22.981, P = .002, respectively).ConclusionsNew-onset events of the residual aorta in patients undergoing Bentall procedures between the Marfan and non-Marfan groups were not significantly different. Distal aortic diameter above normal at initial surgery was associated with a higher risk of adverse aortic events.
Interannual variability (2000–2013) of mesopelagic and bathypelagic particle fluxes in relation to variable sea ice cover in the eastern Fram Strait
Authors: Salter I. , Bauerfeind E. , Fahl K. , Iversen M. H. , Lalande C. , Ramondenc S. , Von Appen W.-J. , Wekerle C. , Nöthig E.-M. 
Published: June 2023

The Fram Strait connects the Atlantic and Arctic Oceans and is a key conduit for sea ice advected southward by the Transpolar Drift and northward inflow of warm Atlantic Waters. Continued sea ice decline and “Atlantification” are expected to influence pelagic–benthic coupling in the Fram Strait and Arctic as a whole. However, interannual variability and the impact of changing ice conditions on deepwater particle fluxes in the Arctic remain poorly characterized. Here, we present long-term sediment trap records (2000–2013) from mesopelagic (200 m) and bathypelagic (2,300 m) depths at two locations (HGIV and HGN) in the Fram Strait subjected to variable ice conditions. Sediment trap catchment areas were estimated and combined with remote sensing data and a high-resolution model to determine the ice cover, chlorophyll concentration, and prevailing stratification regimes. Surface chlorophyll increased between 2000 and 2013, but there was no corresponding increase in POC flux, suggesting a shift in the efficiency of the biological carbon pump. A decrease in particulate biogenic Si flux, %opal, Si:POC, and Si:PIC at mesopelagic depths indicates a shift away from diatom-dominated export as a feasible explanation. Biogenic components accounted for 72% ± 16% of mass flux at 200 m, but were reduced to 34% ± 11% at 2,300 m, substituted by a residual (lithogenic) material. Total mass fluxes of biogenic components, including POC, were higher in the bathypelagic. Biomarkers and ∂13C values suggest both lateral advection and ice-rafted material contribute to benthic carbon input, although constraining their precise contribution remains challenging. The decadal time series was used to describe two end-members of catchment area conditions representing the maximum temperatures of Atlantic inflow water in 2005 at HGIV and high ice coverage and a meltwater stratification regime at HGN in 2007. Despite similar chlorophyll concentrations, bathypelagic POC flux, Si flux, Si:POC, and Si:PIC were higher and POC:PIC was lower in the high-ice/meltwater regime. Our findings suggest that ice concentration and associated meltwater regimes cause higher diatom flux. It is possible this will increase in the future Arctic as meltwater regimes increase, but it is likely to be a transient feature that will disappear when no ice remains.