scholarly journals Analysis of the Triboelectrostatic Charging Behaviour of a Synthetic Sulfidic Copper Ore

Author(s):  
Sabrina Gehringer ◽  
Helmut Flachberger

AbstractIn this study, several tests were performed to analyse the triboelectrostatic charging behaviour of an artificially mixed sulfidic copper ore consisting of quartz and chalcopyrite. To check the surface charge of the pure mineral samples, they were analysed in a self-developed triboelectrostatic charging unit. After that, the artificially mixed sulfidic copper ore was sorted by using a triboelectrostatic belt separator.The objective of the study is to generate basic knowledge about the triboelectrostatic charge behaviour and furthermore the sortability by using electrostatic separation. All separation tests were carried out under controlled ambient conditions.

Author(s):  
N.J. Tao ◽  
J.A. DeRose ◽  
P.I. Oden ◽  
S.M. Lindsay

Clemmer and Beebe have pointed out that surface structures on graphite substrates can be misinterpreted as biopolymer images in STM experiments. We have been using electrochemical methods to react DNA fragments onto gold electrodes for STM and AFM imaging. The adsorbates produced in this way are only homogeneous in special circumstances. Searching an inhomogeneous substrate for ‘desired’ images limits the value of the data. Here, we report on a reversible method for imaging adsorbates. The molecules can be lifted onto and off the substrate during imaging. This leaves no doubt about the validity or statistical significance of the images. Furthermore, environmental effects (such as changes in electrolyte or surface charge) can be investigated easily.


2000 ◽  
Vol 98 (3) ◽  
pp. 125-134 ◽  
Author(s):  
T. Weitkamp, J. Neuefeind, H. E. Fisch

2020 ◽  
Vol 1 (1) ◽  
pp. 11-18
Author(s):  
M. A. Rodionov ◽  
I. V. Akimova

In the submitted study the problem of the formation of financial literacy of students at informatics lessons and relevant training of future informatics teachers is considered. Financial literacy is understood as a set of basic knowledge in the field of finance, banking, insurance, as well as budgeting for personal finances that allow a person to choose the right financial product or service, soberly assess and take risks that may arise during the use of these products, correctly accumulate savings and identify doubtful (fraudulent) investment schemes. The authors conclude that successful development of meaningful lines of the course of financial literacy requires integration of a few school subjects, such as mathematics, history, informatics, social science and literature. The role of modern informatics teacher in the formation of financial literacy of students is great. Therefore, in the training of a future informatics teacher, it should be paid the attention to issues related to the study of elements of financial literacy in informatics lessons. In order to solve the problem, the authors propose to use the special course “Basics of work in 1С:Enterprise”, which is implemented at Penza State University. The article contains a program of the course and the methodological recommendations for its implementation.


Professare ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 82
Author(s):  
Angélica Wrublak ◽  
Elaine Caroline Boscatto

<p class="resumoabstract">Acidentes e fatalidades podem acontecer desde simples contusões até as mais urgentes hemorragias e parada cardiorrespiratória. Os primeiros socorros realizados de forma adequada podem minimizar os agravos e até mesmo salvar vidas. No âmbito escolar, situações de emergência fazem parte do cotidiano e é essencial que Professores de Educação Física tenham um conhecimento básico para atender as necessidades escolares. O presente estudo teve como objetivo verificar o conhecimento dos Professores de Educação Física (EF) da rede pública de Ensino da Cidade de Santa Cecilia-SC com relação aos Primeiros Socorros (PS). Caracterizou-se em natureza descritiva, transversal, com análise quanti-qualitativa dos dados. Participaram do estudo 11 Professores de EF. Para a coleta de dados, foi desenvolvido um questionário abordando aspectos conceituais, procedimentos e atitudes referentes ao cotidiano profissional. Do total, apenas um professor não teve a disciplina de PS na graduação. Os professores na sua minoria se sentem aptos a prestar os PS e inclusive assumir as situações, demonstrando conhecimento satisfatório na teoria, mas na prática sentem-se inseguros para agir diante de situações mais graves. Destaca-se que mais de 80% sabem como agir em atendimentos menos agravantes. Já nas situações de parada cardiorrespiratória (RCP) e hemorragias, os mesmos relataram que necessitam de um treinamento mais atualizado. Em crianças principalmente eles não sentem muito seguros em prover o auxílio. Foi possível concluir que os professores de EF apresentaram um nível de conhecimento satisfatório na teoria, mas sugerem atualizações periódicas em forma de cursos.</p><p class="resumoabstract"><strong>Palavras-chave</strong>: Primeiros Socorros. Docentes. Educação Física e Treinamento.</p><h3>ABSTRACT</h3><p class="resumoabstract">Accidents and fatalities can occur from simple bruises to the most urgent hemorrhages and cardiopulmonary arrest. First aid performed properly can minimize the aggravations and even save lives. In the school context, emergency situations are part of the daily life and it is essential that Physical Education Teachers have a basic knowledge to carry out the school needs. This study verified the Physical Education (PE) Teachers knowledge from Santa Cecilia-SC public teaching related to first aid. It featured in descriptive nature, transversal, with quantitative and qualitative analysis of the data. Eleven PE teachers participated of the study. For the data collection, it was developed a questionnaire addressing conceptual aspects, procedures and attitudes concerning professional daily life. From the total, only one teacher did not have the first aid subject at the college. Teachers in their minority feel able to provide the first aid and even take on the situations, showing satisfactory theory knowledge, however in real life they feel insecure to act on before serious situations. It points out that more than 80% know how to act before less aggravating calls. Nonetheless, during cardiopulmonary arrest (CPR) and hemorrhages, they reported the need of an updated training. Mainly in children, they do not feel safe to provide the aid. It was possible to conclude that Physical Education Teachers showed a satisfactory level of knowledge in theory, however it suggest courses periodic updates.</p><p class="resumoabstract"><strong>Keywords</strong>: First Aid. Faculty. Physical Education and Training.</p>


2000 ◽  
Vol 628 ◽  
Author(s):  
Mark A. Clarner ◽  
Michael J. Lochhead

ABSTRACTOrganically modified silica gels and dye-doped silica gels have been patterned into micrometer-scale structures on a substrate using micro molding in capillaries (MIMIC). This approach is from a class of elastomeric stamping and molding techniques collectively known as soft lithography. Soft lithography and sol-gel processing share attractive features in that they are relatively benign processes performed at ambient conditions, which makes both techniques compatible with a wide variety of organic molecules, molecular assemblies, and biomolecules. The combination of sol-gel and soft lithography, therefore, holds enormous promise as a tool for microfabrication of materials with optical, chemical, or biological functionality that are not readily patterned with conventional methods. This paper describes our investigation of micro-patterned organic-inorganic hybrid materials containing indicator dyes for microfluidic sensor applications. Reversible colorimetric pH sensing via entrapped reagents is demonstrated in a prototype microfluidic sensor element. Patterned structures range from one to tens of micrometers in cross-section and are up to centimeters in length. Fundamental chemical processing issues associated with mold filling, cracking and sensor stability are discussed.


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