scholarly journals Effectiveness of reducing seismic hazard by means of group winning blasting - case study from a copper ore mine in Poland

2018 ◽  
Vol 66 ◽  
pp. 01010
Author(s):  
Anna Barbara Gogolewska ◽  
Natalia Czajkowska
Keyword(s):  
Seismic Event ◽  
Seismic Energy ◽  
Underground Mines ◽  
Copper Ore ◽  
Ore Deposit ◽  
South West ◽  
Effective Operation ◽  
Before And After

The copper ore deposit situated in the south-west of Poland is mined by three underground mines owned by KGHM Polish Copper JSC. Exploitation has been accompanied by rock burst hazard since the beginning. Thus, numerous different preventing measures have been developed such as temporary, organizational and long-term ones. However, no one has been able to predict the time, place and energy of a seismic event. The group winning blasting, with maximum number of blasted faces, is the most effective operation to reduce seismic threat. The more faces are blasted the more seismic energy should be reduced. The study aims at assessing the blasting effectiveness in inducing rock bursts and tremors. For this purpose, the seismic activity induced by mining and blasting were investigated. The number of blasting works and blasted faces as well as length of time between subsequent blasting works were analysed and related to provocation effectiveness. The linear correlation and different regressions were calculated to determine these relations. Moreover, the seismic energy reduction in the rock mass was evaluated by means of SRMS Index, which is a factor measured directly before and after blasting. The analyses covered one mine panel in the Polkowice-Sieroszowice copper mine over four-year period.

scholarly journals EMPIRICAL STUDY ON ALTERNATIVES FOR SAVING AND INVESTING IN THE POSTPANDEMIC PERIOD. CASE STUDY: ROMANIA

2021 ◽  
Vol S.I. (2) ◽  
pp. 27-40
Author(s):  
Alexandru Mihai Alexandru Mihai ◽  
◽  
Ruxandra DINULESCU ◽  
Florin PUCHEANU ◽  
◽  
...  
Keyword(s):  
Empirical Study ◽  
The Past ◽  
Trading Market ◽  
Before And After ◽  
Double Approach ◽  
Potential Risks ◽  
Potential Strategy ◽  
The Impact

This paper develops investigations in the field of saving and investing techniques related to the impact of the COVID19 pandemic on the Romanian trading market. The study focuses particularly on the alternatives for accumulation of money capital which can lead to a positive long-term return. The research aims to investigate the available current services and opportunities in the Romanian investment market and their returns after the pandemic. Towards this objective, the study presents the past returns for several products and the users potential risks. Furthermore, an investigation is conducted based on the latest statistics whereas different variants of portfolios are presented. Unlike most of the previous studies, this analysis has a double approach: evaluating viable alternatives depending on several characteristics and simultaneously developing a long-term potential strategy that could be used to ensure the financial future of an individual in the period of the outbreak of the COVID19 pandemic. This contribution provides an initial analysis of the saving and investing market of Romania before and after the pandemic.

Renewing Street Lighting with LED Technology A Single Case Study in Casarabonela

2019 ◽  
pp. 16-26
Author(s):  
Rosa Maria Morillas ◽  
José Ramon de Andrés
Keyword(s):  
Single Case ◽  
Light Sources ◽  
Single Case Study ◽  
Street Lighting ◽  
Light Levels ◽  
Before And After ◽  
Multiple Case

In 2015, the ecological, economic and social necessity of increasing energy efficiency contributed to street lighting renewal in the Spanish municipality of Casarabonela. Considering fixed operating and maintenance costs, it was a significant, long term investment with high impact for the community. Technicians chose LED light sources after studying technical and economic proposals submitted. Measurements of light levels, energy consumption and costs were carried out before and after the renovation. Once the chosen proposal was implemented, follow up surveys from technicians, maintenance workers and final users were collected. This case study aims to describe steps taken in the process of luminaires replacement. It has been estimated savings, expected and actual together with the return period on investment. This case may well serve as a prototype for a subsequent multiple case study which aims to validate a list of indicators obtained in a previous research.

The Noongar of south-western Australia: a case study of long-term biodiversity conservation in a matrix of old and young landscapes

2020 ◽  
Author(s):  
Alison Lullfitz ◽  
Carol Pettersen ◽  
Ron (Doc) Reynolds ◽  
Aden Eades ◽  
Averil Dean ◽  
...  
Keyword(s):  
Biodiversity Conservation ◽  
Biodiversity Hotspots ◽  
Chi Square ◽  
South West ◽  
Granite Outcrops ◽  
Global Biodiversity ◽  
Rich Flora ◽  
Ocbil Theory

Abstract Occurring across all southern hemisphere continents except Antarctica, old, climatically buffered, infertile landscapes (OCBILs) are centres of biological richness, often in biodiversity hotspots. Among a matrix of young, often disturbed, fertile landscapes (YODFELs), OCBILs are centres of endemism and diversity in the exceptionally rich flora of the south-west Australian global biodiversity hotspot, home to Noongar peoples for ≥ 48 000 years. We analysed contemporary traditional Noongar knowledge of adjacent OCBILs (e.g. granite outcrops) and YODFELs (e.g. creekline fringes) both at a single site and in two larger areas to test whether patterns of disturbance dictated by Noongar custom align with OCBIL theory. We found that Noongar traditional knowledge reflects a regime of concentrated YODFEL rather than OCBIL disturbance—a pattern which aligns with maximal biodiversity preservation. SIMPER testing found traditional Noongar OCBIL and YODFEL activities are 64–75% dissimilar, whereas Pearson’s chi-square tests revealed camping, burning, travelling through country and hunting as primarily YODFEL rather than OCBIL activities. We found that Noongar activities usually avoid OCBIL disturbance. This combined with high floristic diversity following enduring First Peoples’ presence, suggests that traditional Noongar knowledge is valuable and necessary for south-west Australian biodiversity conservation. Similar cultural investigations in other OCBIL-dominated global biodiversity hotspots may prove profitable.

scholarly journals The need for a long-term mindset when measuring the effects of lean on health-related quality management values

2017 ◽  
Vol 10 (3) ◽  
pp. 249-264 ◽  
Author(s):  
Pernilla Ingelsson ◽  
Ingela Bäckström
Keyword(s):  
Quality Management ◽  
Health Related Quality ◽  
Content Type ◽  
The Public ◽  
Starting Point ◽  
Before And After ◽  
Related Quality ◽  
Health Related

Purpose The purpose of this paper is to investigate the effects a lean initiative has on the health-related quality management (QM) values, “Leadership Commitment” and “Participation of Everybody,” as well as on perceived co-worker health in the public sector. Design/methodology/approach A case study was carried out at a municipal division that had been working with lean for approximately 18 months. A questionnaire was used to measure the effect on health-related QM values both before and after the initial 18 month period. Documents from the intended lean implementation were studied at the starting point and after 18 months; this was followed up by examining new documents. The results from the questionnaires were analyzed using SPSS and the documents were analyzed by means of document comparisons and consensus discussion in the research group. Findings The effects on the health-related QM values; “Leadership Commitment” and “Participation of everybody” in this study showed that the values still permeated the organization to a relatively high extent after 18 months but that no statistical differences can be shown between the two measurement points. When measuring what effects a lean initiative has on values, a period of 18 months might be too short, if significance changes are expected. None the less, the results can be a way of monitoring the development of these softer values. Something that is equally important is to see if there have been any major changes, as a way of keeping the work with building a new culture alive and in focus. The results strengthen the assumption that a long-term mindset is needed when QM initiatives such as lean are applied within an organization especially when changes to values and workplaces are expected. Originality/value This study has further explored the QM in relation to lean in the respect of how the QM values “Leadership commitment” and “Participation of Everybody” are effected by a lean initiative.

scholarly journals Deciphering long-term coastal dynamics using IR-RF and ESR dating: a case study from Médoc, south-west France

2018 ◽  
Vol 48 ◽  
pp. 108-120 ◽  
Author(s):  
Sebastian Kreutzer ◽  
Mathieu Duval ◽  
Melanie Bartz ◽  
Pascal Bertran ◽  
Mathieu Bosq ◽  
...  
Keyword(s):  
Esr Dating ◽  
Coastal Dynamics ◽  
South West

scholarly journals Understanding Contributor to Developer Turnover Patterns in OSS Projects: A Case Study of Apache Projects

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Aftab Iqbal
Keyword(s):  
Social Relation ◽  
Source Code ◽  
Term Survival ◽  
Long Term Survival ◽  
High Interest ◽  
Before And After ◽  
Research Questions

OSS projects are dynamic in nature. Developers contribute to a project for a certain period of time and later leave the project or join other projects of high interest. Hence, the OSS community always welcomes members who can attain the role of a developer in a project. In this paper, we investigate contributions made by members who have attained the role of a developer. In particular, we study the contributions made by the members in terms of bugs reported, comments on bugs, source-code patch submissions, and their social relation with other members of an OSS community. Further, we study the significance of nondevelopers contribution and investigate if and to what extent they play a role in the long-term survival of an OSS project. Moreover, we investigate the ratio of contributions made by a member before and after attaining the role of a developer. We have outlined 4 research questions in this regard and further discuss our findings based on the research questions by taking into account data from software repositories of 4 different Apache projects.

scholarly journals Where to prescribe burn: the costs and benefits of prescribed burning close to houses

2020 ◽  
Vol 29 (5) ◽  
pp. 440 ◽  
Author(s):  
Veronique Florec ◽  
Michael Burton ◽  
David Pannell ◽  
Joel Kelso ◽  
George Milne
Keyword(s):  
Rural Areas ◽  
Prescribed Burning ◽  
Fire Risk ◽  
Spatial Arrangement ◽  
Public Land ◽  
Costs And Benefits ◽  
Prescribed Burns ◽  
South West

Prescribed burning is used in Australia as a tool to manage fire risk and protect assets. A key challenge is deciding how to arrange the burns to generate the highest benefits to society. Studies have shown that prescribed burning in the wildland–urban interface (WUI) can reduce the risk of house loss due to wildfires, but the costs and benefits of different arrangements for prescribed burning treatments have rarely been estimated. In this study, we use three different models to explore the costs and benefits of modifying the spatial arrangement of prescribed burns on public land, using the south-west of Western Australia as a case study. We simulate two hypothetical scenarios: landscape treatments and WUI treatments. We evaluate the long-term costs and benefits of each scenario and compare the results from the three models, highlighting the management implications of each model. Results indicate that intensifying prescribed burning treatments in public land in the WUI achieves a greater reduction in damages compared with applying the majority of the treatments in rural areas. However, prescribed burning in the WUI is significantly more expensive and, despite additional benefits gained from this strategy, in most cases it is not the most economically efficient strategy.

scholarly journals Earthquake Relocation Studies near Local Scale Sources using Double-Difference Technique

2021 ◽  
Vol 1 (1) ◽  
pp. 394-398
Author(s):  
Wrego Seno Giamboro ◽  
Hafiz Hamdalah
Keyword(s):  
Seismic Energy ◽  
Mining Area ◽  
Underground Mines ◽  
Double Difference ◽  
Earthquake Relocation ◽  
Accuracy And Precision ◽  
Before And After ◽  
High Level ◽  
Mine Openings

Determination of the location of the hypocenter is very necessary to monitor the potential for seismic hazard. Positioning and seismic energy can help safety workers determine which areas can be mined or temporarily halted. Earthquakes in underground mines are caused by seismic induction due to mining activities such as blasting processes, hydrofracturing, vehicle activities, etc. Earthquakes that occur are generally clustering. Earthquake events generally occur in mine openings, this is caused by mass compensation taken. The data used in this study are synthetic micro-earthquake data around the mining area. To obtain a high level of accuracy and precision, especially in determining the location and depth in determining the hypocenter using the Double-Difference (DD) method. The results of the microseismic relocation in the study area are well covered, as evidenced by the residual histogram and shift distribution. The shift of the microseismic before and after being relocated spread in all directions with the dominant direction in the NE – SW direction. The value of the microseismic shift before and after being relocated ranged from 0.5 meters to 150 meters.

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