scholarly journals Essesment of IM-50 and TOFA Adsorbed Layer on Cassiterite in Flotation of Tin Sulfide Wastes

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Tamara MATVEEVA ◽  
Nadezhda GROMOVA
Keyword(s):  
Adsorbed Layer ◽  
Visible Spectrum ◽  
Uv Spectra ◽  
Tin Sulfide ◽  
Russian Science ◽  
Adsorption Characteristic ◽  
Quantitative Results ◽  
Characteristic Adsorption ◽  
Tall Oil Fatty Acids ◽  
Positive Effect

The paper presents the results of experimental study of the adsorption characteristic of theIM-50 and tall oil fatty acids (TOFA) collector reagents on cassiterite. UV-spectrophotometric method, scanning electron and lasermicroscopy were applied to analyze the adsorption of the reagents. SHIMADZU UV 1800 was used to obtain the UV spectra of aqueous solutions of IM-50 reagents and saponified TOFA at varied concentrations. IM-50 has not got characteristic adsorption maximain ultraviolet and visible spectrum. TOFA has a weakly pronounced maximum absorption in the range of 233-244 nm. Microscopicphotographs of cassiterite sections were obtained with LEO 1420VP INCA equipped OXFORD ENERGY 350 analyzer. Reagent IM-50and TOFA collector reagent, Newly formed organic matter phases of IM-50 and TOFA were detected. X-ray spectra characterized theincreased carbon content indicating adsorption on the surface of cassiterite IM-5- and TOFA.By measuring the surface relief parameters of polished cassiterite, using KEYENCE VK-9700 scanning laser microscopy and VK-Analyzer software, a qualitative and quantitative assessment of the IM-50 and TOFA reagent layer on the cassiterite surface was performed. Measurements were performed in the several fields of view and showed the degree of IM-50 coating varied from 40.5 to 42.6%of the surface area, and TOFA average coating was 38.5%. Subsequent washing with water does not remove the reagents from thesurface of the mineral and indicates a strong fixation of IM-50 and TOFA on cassiterite, which can have a positive effect on flotationextraction of sludge tin fractions.Qualitative and quantitative results of the reagent adsorption helped to make a forecast of their floatability by the studied collectors.This study is supported by the Russian Science Foundation (project No. 17-17-01292).

scholarly journals The Effect of Internationalising the Student Community on Graduate Students' Global Citizenship:

2021 ◽  
Vol 8 (1) ◽  
pp. 1-26
Author(s):  
Justine Ayebare
Keyword(s):  
Graduate Students ◽  
Qualitative Data ◽  
Global Citizenship ◽  
Survey Study ◽  
Global Competence ◽  
Education Student ◽  
Thematic Content Analysis ◽  
Student Community ◽  
Quantitative Results ◽  
Positive Effect

This article examines the effect of internationalising the student community on graduate students’ demonstrated commitment to global citizenship at a university in Uganda. It arose from a sequential explanatory survey study. Quantitative and qualitative data were gathered from a sample of 180 graduate students, with the former analysed employing descriptive and inferential statistics, while the latter were analysed using thematic content analysis. The quantitative results revealed that an internationalised studentcommunity has a statistically significant positive effect on graduate students’ demonstrated global competence, but not on their demonstrated commitment to social responsibility. The qualitative findings produced similar results. They revealed that the presence of international students on campus coupled with graduate students’ participation in international activities such as conferences and inter-cultural activities promoted their commitment to global citizenship. These findings are in line with those of previous studies. We thus recommend that universities in Uganda and other developing countries in the Global South further internationalise their graduate student community as a strategy to promote their commitment to global citizenship. Key words: internationalisation, global citizenship, globalisation, higher education, student community

scholarly journals Dispersion of light by Potassium Vapour

1910 ◽  
Vol 84 (570) ◽  
pp. 209-225 ◽  
Keyword(s):  
Wave Length ◽  
Principal Series ◽  
Visible Spectrum ◽  
Ultra Violet ◽  
Anomalous Dispersion ◽  
Present Communication ◽  
Absorption Region ◽  
Sodium Potassium ◽  
Light Passing ◽  
Quantitative Results

Anomalous dispersion in the region of the red lines of potassium was first observed by Ebert in 1904. The method adopted for Ebert’s experiments was a modified form of the crossed prism method used by Wood in the investigation of the corresponding phenomena in the case of sodium. Potassium was heated in a tube through which two currents of hydrogen passed from each end to a central outlet. The cool hydrogen kept the potassium vapour in a prismatic form, so that light passing along the length of the tube suffered deviation and dispersion by the potassium vapour prism. The author of the present communication has shown that there is no need for the hydrogen streams. If the tube be kept cool on its upper surface the metallic vapour takes of itself a prismatic form or is arranged in layers of decreasing density, and so behaves in a similar way to a prism of homogeneous vapour. The present communication deals with quantitative results from the measurement of dispersions at different wave-lengths, and it appears that the deviation due to potassium vapour is observable over the whole of the visible spectrum and for a considerable distance in the ultra-violet. Strong absorption takes place at the lines of the principal series and for wave-lengths near these series lines we have "anomalous" dispersion. This phenomenon has been observed at seven of the pairs forming the principal series lines for potassium—as the pairs of lines in this series get closer and closer together with diminishing wave-length, the dispersion effects after the first two pairs are only observable outside the lines forming a pair, but there appears a lack of symmetry in the observed dispersion curves corresponding to the different intensities of the lines forming the pair. The dispersion to be observed may then be regarded as that corresponding to the principal series absorption lines; no other absorption region seems to affect the dispersion —at any rate at low densities of vapour.

scholarly journals A Serious Game Approach to Improve Food Behavior in Families—A Pilot Study

Nutrients ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1415 ◽  
Author(s):  
Sigrid Skouw ◽  
Anja Suldrup ◽  
Annemarie Olsen
Keyword(s):  
Pilot Study ◽  
Age Groups ◽  
Positive Change ◽  
Serious Game ◽  
Food Behavior ◽  
Baseline Test ◽  
Quantitative Results ◽  
Families With Children ◽  
Positive Effect

The objective of this pilot study was to investigate the effect of a specially developed serious game to improve food behavior in families with children aged 5–13 years using mixed methods. Fourteen families were randomized into a game-group and a non-game-group and divided into age groups (game-children (GC), game-parents (GP), non-game-children (nGC), and non-game-parents (nGP)). The families completed a baseline test, a three-week intervention period with or without a game element, and a follow-up test. Qualitative results showed a positive change in food behavior in all families. Quantitative results mainly showed an effect in food neophobia as a decrease was seen in all groups; however, it was only significant (p < 0.05) in three groups (GP, nGC, nGP). No changes were seen in willingness to taste, and only limited changes in liking and number of words used to describe the stimuli. In conclusion, qualitative results showed positive change in the children’s food behavior in most families, indicating a positive effect of performing tastings and tasks together as a family—regardless of the presence of a game element. However, this was not as clear in the quantitative data, indicating that current quantitative tools are less suited to measure complex concepts like willingness to taste.

Let’s Start With the End: Bibliodrama in an Italian Death Education Course on Managing Fear of Death, Fantasy-Proneness, and Alexithymia With a Mixed-Method Analysis

2019 ◽  
pp. 003022281986361 ◽  
Author(s):  
Ines Testoni ◽  
Gianmarco Biancalani ◽  
Lucia Ronconi ◽  
Silvia Varani
Keyword(s):  
Mixed Method ◽  
Fear Of Death ◽  
Death Education ◽  
Negative Attitudes ◽  
Fantasy Proneness ◽  
Attitudes Toward Death ◽  
Quantitative Results ◽  
Final Question ◽  
Method Analysis ◽  
Positive Effect

This article presents the results of an experience of death education (DE) course with bibliodrama in Italian high schools, which focused on emotions and existential themes. The research analyzed the inability to recognize or describe one’s own emotions (alexithymia), fantasy-proneness, and attitudes toward death in two different groups of students: one who took a course on DE (with 113 students) and another who did not participate in it (with 114 students). The use of a mixed method allowed this study to explore the quantitative results that the students indicated in the questionnaire and the qualitative open answers to the final question about how they had profited from this DE course. The results showed that the course had a positive effect, as the DE group significantly decreased alexithymia and negative attitudes toward death, particularly in fear and avoidance of death, making their representation of death less traumatic.

The Positive Effect

2020 ◽  
pp. 145-180
Author(s):  
Daniel Krcmaric
Keyword(s):  
Burkina Faso ◽  
Statistical Models ◽  
International Justice ◽  
Deterrent Effect ◽  
Mass Killing ◽  
Mass Violence ◽  
Number Of Factors ◽  
Quantitative Results ◽  
Positive Effect

This chapter explores the deterrent effect of international justice and estimates that the statistical models of mass-killing onset show how the same conditions that exacerbate conflict also create deterrence. It discusses a case study of Blaise Compaoré during Burkina Faso's 2014 revolution, which complements the quantitative results. It also elaborates the Compaoré case that highlights the connection between the decision to commit atrocities and the availability of a safe exile option. The chapter explains how Burkina Faso represents a case in 2014 where a number of factors suggested that mass violence was possible. It recounts Compaoré's retirement abroad once it became clear that he could no longer maintain political control in Burkina Faso.

scholarly journals Can Report Templates Aid Student Learning in Undergraduate Chemistry Laboratory Classes?

2015 ◽  
Vol 12 (2) ◽  
pp. 20-32
Author(s):  
Clare Paton-Walsh ◽  
Keyword(s):  
Student Learning ◽  
Learning Outcomes ◽  
Chemistry Laboratory ◽  
Laboratory Exercise ◽  
Undergraduate Chemistry ◽  
Key Concepts ◽  
Undergraduate Laboratory ◽  
Quantitative Results ◽  
Positive Effect ◽  
Assessment Questions

This paper describes a study aimed at assessing the ability of report templates to help students learn key concepts during undergraduate laboratory classes. The report templates were designed so that a set of assessment questions led the students through the logical steps required to perform the laboratory exercise and to calculate the required quantitative results. Additional questions probed the students’ understanding of the key concepts covered. The study assessed the efficacy of the report templates in achieving these goals over a 3 year period via the use of a questionnaire, laboratory marks and marks awarded for examination questions that tested one of the key learning outcomes. The report templates were found to save time for students and academics alike without any negative (or positive) effect on learning outcomes.

scholarly journals Combinational Approach of Energy Management for Sustainable Food and Crop Storage Facilities: A Research Concept

2021 ◽  
Author(s):  
Mohammad Nur-E Alam ◽  
Soyed Mohiuddin Ahmed ◽  
Mohammad Nasirul Hoque ◽  
Mohammad Khairul Basher ◽  
Narottam Das
Keyword(s):  
Thin Film ◽  
Construction Materials ◽  
Visible Spectrum ◽  
Energy System ◽  
Uv Spectra ◽  
Sustainable Food ◽  
Hybrid Energy ◽  
Thin Film Coatings ◽  
Research Concept ◽  
Storage Facilities

This research project focuses on the optimization of the hybrid energy system together with the assistance of thin-film coatings aiming to achieve self-sustainable food and crop storage facilities which will run effectively with its own generated energy. An infrastructure will be designed and constructed that will comprise a hybrid power generation system accompanied by thin-film coated semitransparent and non-transparent construction materials for energy saving. Thin-film low emissivity (Low-E) type coatings will assist the transparent or semitransparent construction materials to reflect most of the infrared (IR-mostly heat) and UV spectra of sunlight without interrupting the visible spectrum and will lead to saving energy consumption by reducing the heat and lighting during day time

scholarly journals A Systematic Literature Review of Animal-Assisted Interventions in Oncology (Part I): Methods and Results

2020 ◽  
Vol 19 ◽  
pp. 153473542094327
Author(s):  
Timothy R. N. Holder ◽  
Margaret E. Gruen ◽  
David L. Roberts ◽  
Tamara Somers ◽  
Alper Bozkurt
Keyword(s):  
Literature Review ◽  
Systematic Literature Review ◽  
Well Being ◽  
Future Research ◽  
Therapy Animals ◽  
Risk Patients ◽  
Report Data ◽  
Quantitative Results ◽  
Positive Effect

Animal-assisted interventions (AAIs) use human-animal interactions to positive effect in various contexts including cancer care. As the first installment of a 2-part series, this systematic literature review focuses on the research methods and quantitative results of AAI studies in oncology. We find methodological consistency in the use of canines as therapy animals, in the types of high-risk patients excluded from studies, and in the infection precautions taken with therapy animals throughout cancer wards. The investigated patient endpoints are not significantly affected by AAI, with the exceptions of improvements in oxygen consumption, quality of life, depression, mood, and satisfaction with therapy. The AAI field in oncology has progressed significantly since its inception and has great potential to positively affect future patient outcomes. To advance the field, future research should consistently improve the methodological design of studies, report data more completely, and focus more on the therapy animal’s well-being.

scholarly journals A Systematic Literature Review of Animal Assisted Interventions in Oncology (Part I): Methods and Results

2019 ◽  
Author(s):  
Timothy Holder ◽  
Margaret Gruen ◽  
David Roberts ◽  
Tamara Somers ◽  
Alper Bozkurt
Keyword(s):  
Literature Review ◽  
Systematic Literature Review ◽  
Well Being ◽  
Therapy Animals ◽  
Risk Patients ◽  
Report Data ◽  
Quantitative Results ◽  
Positive Effect ◽  
Future Patient

Animal-assisted interventions (AAI) use human-animal interactions to positive effect in various contexts including cancer care. This systematic literature review is the first part of a two-part paper series focusing on the research methods and quantitative results of AAI studies in oncology. We find methodological consistency in the use of canines as therapy animals, in the types of high-risk patients excluded from studies, and in the infection precautions taken with therapy animals throughout cancer wards. The investigated patient endpoints are not significantly affected by AAI, with the exceptions of improvements in oxygen consumption, quality of life, depression, mood, and satisfaction with therapy. The AAI field in oncology has progressed significantly since its inception and has great potential to positively impact future patient outcomes. To advance the field, AAI research in oncology should consistently improve the methodological design of studies, report data more completely, and focus on the therapy animal&rsquo;s well-being.

Trends in Electron Energy Loss Spectroscopy

1977 ◽  
Vol 35 ◽  
pp. 228-229
Author(s):  
C. Colliex ◽  
P. Trebbia
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
Electron Energy Loss Spectroscopy ◽  
Materials Science ◽  
Analytical Technique ◽  
Recent Developments ◽  
Quantitative Results ◽  
Electron Microscopes ◽  
Electron Energy Loss ◽  
Primary Electrons

The physical foundations for the use of electron energy loss spectroscopy towards analytical purposes, seem now rather well established and have been extensively discussed through recent publications. In this brief review we intend only to mention most recent developments in this field, which became available to our knowledge. We derive also some lines of discussion to define more clearly the limits of this analytical technique in materials science problems.The spectral information carried in both low ( 0<ΔE<100eV ) and high ( >100eV ) energy regions of the loss spectrum, is capable to provide quantitative results. Spectrometers have therefore been designed to work with all kinds of electron microscopes and to cover large energy ranges for the detection of inelastically scattered electrons (for instance the L-edge of molybdenum at 2500eV has been measured by van Zuylen with primary electrons of 80 kV). It is rather easy to fix a post-specimen magnetic optics on a STEM, but Crewe has recently underlined that great care should be devoted to optimize the collecting power and the energy resolution of the whole system.

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