scholarly journals Design and dimensioning of sublevel stoping for extraction of thin ore (< 12 m) at very deep level: a case study of konkola copper mines (kcm), Zambia

2018 ◽  
Vol 5 (1) ◽  
pp. 27-32
Author(s):  
Nevaid Dzimunya ◽  
Krishna Radhe ◽  
Chanda William
Keyword(s):  
Deep Level ◽  
Copper Mines ◽  
Sublevel Stoping

scholarly journals A Statistical Investigation of Mesoscale Precursors of Significant Tornadoes: The Italian Case Study

Atmosphere ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 301
Author(s):  
Roberto Ingrosso ◽  
Piero Lionello ◽  
Mario Marcello Miglietta ◽  
Gianfausto Salvadori
Keyword(s):  
Potential Energy ◽  
Wind Shear ◽  
Deep Level ◽  
Convective Available Potential Energy ◽  
Vertical Wind Shear ◽  
Statistical Investigation ◽  
Italian Case ◽  
Large Wind

In this study, mesoscale environments associated with 57 significant tornadoes occurring over Italy in the period 2000–2018 are analyzed. The role of the vertical Wind Shear in the lower and middle troposphere, in terms of low-level shear (LLS) and deep-level shear (DLS), and of the convective available potential energy (CAPE) as possible precursors of significant tornadoes is statistically investigated. Wind shear and CAPE data are extracted from the ERA-5 and ERA-Interim reanalyses. Overall, the study indicates that: (a) values of these variables in the two uppermost quartiles of their statistical distribution significantly increases the probability of tornado occurrences; (b) the probability increases for increasing values of LLS and DLS, and (c) is maximum when either wind shear or CAPE are large. These conclusions hold for both the reanalysis datasets and do not depend upon the season and/or the considered area. With the possible exception of weak tornadoes, which are not included in our study, our results show that large wind shear, in the presence of medium-to-high values of CAPE, are reliable precursors of tornadoes.

scholarly journals Personal Constructions of Biological Concepts – The Repertory Grid Approach

2017 ◽  
Vol 7 (1) ◽  
pp. 93-110
Author(s):  
Thomas J. J. McCloughlin
Keyword(s):  
Natural Kinds ◽  
Deep Level ◽  
Repertory Grid ◽  
School Students ◽  
Grid Analysis ◽  
Conceptual Structures ◽  
Grid Approach ◽  
Biological Concepts ◽  
Almost All

This work discusses repertory grid analysis as a tool for investigating the structures of students’ representations of biological concepts. Repertory grid analysis provides the researcher with a variety of techniques that are not associated with standard methods of concept mapping for investigating conceptual structures. It can provide valuable insights into the learning process, and can be used as a diagnostic tool in identifying problems that students have in understanding biological concepts. The biological concepts examined in this work are ‘natural kinds’: a technical class of concepts which ‘appear’ to have invisible ‘essences’ meaning carrying more perceptual weight than being perceptually similar. Because children givemore weight to natural-kind membership when reasoning about traits, it would seem pertinent to apply such knowledge to deep-level research into how children reason in biology. The concept of natural kinds has a particular resonance with biology since biological kinds hold the distinction of being almost all natural kinds, such as when the same ‘stuff or thing’ takes many different forms. We have conducted a range of studies using a diversity of biological natural kinds, but in this paper, we wish to explore some of the theoretical underpinnings in more detail. To afford this exploration, we outline one case-study in a small group of secondary school students exploring the concept of ‘equine’ – that is, what is an equine? Five positive examples were chosen to engaged with by the students and one ‘outlier’ with which to compare the construction process. Recommendations are offered in applying this approach to biological education research.

scholarly journals The Influence of Time on the Density and Detonation Velocity of Bulk Emulsion Explosives – a Case Study from Polish Copper Mines

2019 ◽  
Vol 16 (2) ◽  
pp. 245-258 ◽  
Author(s):  
Piotr Mertuszka ◽  
Krzysztof Fuławka ◽  
Mateusz Pytlik ◽  
Jarosław Wincenciak ◽  
Andrzej Wawryszewicz
Keyword(s):  
Detonation Velocity ◽  
Emulsion Explosives ◽  
Copper Mines

scholarly journals Book Publication as Pedagogy: Taking Learning Deep and Wide

2019 ◽  
Vol 4 (2) ◽  
pp. 568-589
Author(s):  
Lisa G. Stoneman ◽  
DorothyBelle Poli ◽  
Anna Denisch ◽  
Lydia Weltmann ◽  
Melanie Almeder
Keyword(s):  
Deep Learning ◽  
Social Studies ◽  
Knowledge Acquisition ◽  
Learning Outcomes ◽  
Deep Level ◽  
Knowledge Synthesis ◽  
The Self ◽  
Directed Research ◽  
Self Authorship

For students, the practice of writing, illustrating, and publishing facilitates deep learning experiences, both within and beyond the discipline for which the writing is targeted. In this case study, students created books under the umbrella of a large, transdisciplinary research project: a science-based, illustrated activity book, a children’s fiction chapter book with illustrations, an adolescent novel, and two illustrated social studies activity books. Students completed the self-directed research, wrote the narratives, created the artwork, sought the advice of outside scholars and artists, and revised with discipline-specific mentors. Data include the books, mentor notes, and student-reported learning outcomes. Data reveal broad content and pedagogical skill knowledge acquisition, knowledge synthesis, and a deep level of self-authorship.

Deep-level quality management based on big data analytics with case study

2017 ◽  
Author(s):  
Xiaolei Li ◽  
Zhenyu Tu ◽  
Quanchao Jia ◽  
Xinjiang Man ◽  
Hui Wang ◽  
...  
Keyword(s):  
Big Data ◽  
Quality Management ◽  
Data Analytics ◽  
Deep Level ◽  
Big Data Analytics

On Deep Level Transient Spectroscopy of Extended Defects in n-Type 4H-SiC

2017 ◽  
Vol 897 ◽  
pp. 201-204 ◽  
Author(s):  
Jonas Weber ◽  
Heiko B. Weber ◽  
Michael Krieger
Keyword(s):  
Quantum Wells ◽  
Deep Level Transient Spectroscopy ◽  
Deep Level ◽  
Differential Capacitance ◽  
Extended Defects ◽  
Extended Defect ◽  
Dlts Spectrum ◽  
Poisson Solver ◽  
Transient Spectroscopy

We have performed capacitance-voltage (C-V) and deep level transient spectroscopy (DLTS) measurements on Schottky contacts fabricated on triangular defects in 4H-SiC epitaxial layers. These measurements are a case study on the effect of a specific extended defect on the DLTS spectrum in order to contribute to the physical understanding of curious features occasionally observed in DLTS spectra. Our measurements reveal an inversion of the DLTS signal depending on applied voltages and filling pulse lengths, and a step in the C-V characteristic of the Schottky diode. We present a model that qualitatively describes the experimentally obtained data. In this model, we assume that stacking faults within a triangular defect form quantum wells, which can capture electrons from other defects during the DLTS measurement leading to the inversion of the DLTS spectrum. Moreover, by calculating the differential capacitance using a self-consistent Schrödinger-Poisson-Solver, the step in the C-V measurements is reproduced by our model.

‘Good Lawyers but Poor Workers’: Recruited Angolan Labour in the Copper Mines of Katanga, 1917–1921

1977 ◽  
Vol 18 (2) ◽  
pp. 237-259 ◽  
Author(s):  
Charles Perrings
Keyword(s):  
Political Economy ◽  
Short Term ◽  
Unskilled Labour ◽  
Copper Mines ◽  
Worker Behaviour ◽  
Robert Williams

Between 1917 and 1921 Robert Williams and Company recruited labour from the Moxico Province of Angola for work in the Katanga copper mines of the Union Minière. The episode is one of the better documented in a period in which comparable recruiting operations were the mainstay of the industry, and provides a case study that is also a vehicle for the analysis of the significance of recruitment both as an instrument of industrial strategy and a determinant of worker behaviour. It is argued that recruitment is characteristic of a phase in the development of the colonial political economy marked by the use of highly unskilled labour intensive techniques of production in the dominant industry. It is a mechanism designed specifically to service such techniques through the regulation of the induced supply of short-term, unskilled labour. It is further argued that it is such regulation—realized as coercion—that gives recruitment its particularity as a determinant of worker behaviour, and this paper seeks to identify from the Angolan case the precise implications which this had for the workers themselves.

scholarly journals An Application of Kierkegaard’s Philosophy of Freedom to Psychotherapy and Philosophical Counseling

2004 ◽  
Vol 2 (1) ◽  
pp. 82-105
Author(s):  
Leslie Spivak ◽  
Keyword(s):  
Deep Level ◽  
Human Freedom ◽  
The Self ◽  
Philosophical Writings

Kierkegaard’s philosophical writings in the area of human freedom have great explanatory powers and strong relevance for philosophical counseling and psychotherapy. This paper will explore those principles that have a bearing on helping people deal with life’s issues. Freedom is an overarching term that encompasses many concepts. All of these concepts, in turn, describe different manifestations of the self. The self is central to Kierkegaard’s philosophy of freedom. He describes the self in dynamic and structural terms and by levels of consciousness. Despair is a key concept in this philosophy; it is a deep level of anxiety that signals whether the self is moving forward in freedom, or withdrawing into unfreedom. A case study will be used to exemplify these concepts within a psychother­peutic milieu.

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