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Wijaya, Andi Rahadiyan
Alternative names
Publications (10 of 10) Show all publications
Hamodi, H., Lundberg, J., Wijaya, A. & Ghodrati, B. (2014). Downtime analysis of drilling machines and suggestions for improvements (ed.). Paper presented at . Journal of Quality in Maintenance Engineering, 20(4), 306-332
Open this publication in new window or tab >>Downtime analysis of drilling machines and suggestions for improvements
2014 (English)In: Journal of Quality in Maintenance Engineering, ISSN 1355-2511, E-ISSN 1758-7832, Vol. 20, no 4, p. 306-332Article in journal (Refereed) Published
Abstract [en]

Purpose– The purpose of this paper is to analyse and compare the downtime of four drilling machines used in two underground mines in Sweden. The downtime of these machines was compared to show what problems affect downtime and which strategies should be applied to reduce it.Design/methodology/approach– The study collects failure data from a two-year period for four drilling machines and performs reliability analysis. It also performs downtime analysis utilising a log-log diagram with a confidence interval.Findings– There are notable differences in the downtime of most of the studied components for all machines. The hoses and feeder have relatively high downtime. Depending on their downtime, the significant components can be ranked in three groups. The downtime of the studied components is due to reliability problems. The study suggests the need to improve the reliability of critical components to reduce the downtime of drilling machines.Originality/value– The method of analysing the downtime, identifying dominant factors and the interval estimation for the downtime, has never been studied on drilling machines. The research proposed in this paper provides a general method to link downtime analysis with potential component improvement. To increase the statistical accuracy; four case studies was performed in two different mines with completely different working environment and ore properties. Using the above method showed which components need to be improved and suggestions for improvement was proposed and will be implemented accordingly.

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-16307 (URN)10.1108/JQME-11-2012-0038 (DOI)2-s2.0-84918796987 (Scopus ID)fef58794-bb42-486c-b91b-c626e6eda0d3 (Local ID)fef58794-bb42-486c-b91b-c626e6eda0d3 (Archive number)fef58794-bb42-486c-b91b-c626e6eda0d3 (OAI)
Note
Validerad; 2014; Bibliografisk uppgift: Hussan S. Al-Chalabi received BEng Degree in Mechanical Engineering from the Mosul University, Iraq in 1994 and MSc Degree in Mechanical Engineering in Thermal Power from the Mosul University, Iraq in 2008. Then he joined the Department of Mechanical Engineering at the Mosul University as a Lecturer. In 2011 he joined the Division of Operation, Maintenance and Acoustics at the LTU as a Doctoral Student. Hussan S. Al-Chalabi is the corresponding author and can be contacted at: hussan.hamodi@ltu.se Jan Lundberg is a Professor of Machine Elements at the Lule°a University of Technology and also in Operation & Maintenance with focus on product development. During the years 1983- 2000, his research concerned mainly about engineering design in the field of machine elements in industrial environments. During the years 2000-2006, his research concerned mainly about industrial design, ergonomic and related problems as cultural aspects of design and modern tools for effective industrial design in industrial environments. From 2006 and forward, his research is completely focused on maintenance issues like methods for measuring failure sources, how to do design out maintenance and how to design for easy maintenance. Dr Andi Wijaya received BEng Degree in Mechanical Engineering from the Gadjah Mada University (GMU), Indonesia in 1998 and MSc Degree in Industrial Ergonomics and Licentiate Degree in Sound and Vibration from the Lulea University of Technology (LTU), Sweden in 2001 and 2003, respectively. Then he joined to the Department of Mechanical and Industrial Engineering at the GMU as a Lecturer. Since 2009, he received PhD Degree from the Division of Operation, Maintenance and Acoustics, Lule°a University of Technology, Sweden in 2012. Behzad Ghodrati is an Associate Professor of Maintenance and Reliability Engineering at the Lule°a University of Technology. He obtained his PhD Degree on “Reliability based spare parts planning” from the Lule°a University of Technology and he was awarded the Postdoctoral Research Fellowship from the University of Toronto in 2008.; 20141015 (hasham)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Wijaya, A., Lundberg, J. & Kumar, U. (2012). Downtime analysis of a scaling machine (ed.). Paper presented at . International Journal of Mining, Reclamation and Environment, 26(3), 244-260
Open this publication in new window or tab >>Downtime analysis of a scaling machine
2012 (English)In: International Journal of Mining, Reclamation and Environment, ISSN 1748-0930, E-ISSN 1748-0949, Vol. 26, no 3, p. 244-260Article in journal (Refereed) Published
Abstract [en]

Scaling machines are identified as one of the major contributors to unplanned downtime. In general, to gain a better understanding of downtime, an analysis of the downtime should be performed. Downtime analysis usually involves a group consisting of many people with various backgrounds. The use of a visualisation method can act as a bridge that eliminates the knowledge gap within the group. The present study has two purposes: firstly to develop a method for visualisation of downtime and secondly to analyse the downtime of a scaling machine utilising the proposed visualisation method. The proposed method provides a visualisation of the downtime estimation and the precision and the uncertainty of the estimation at a given confidence level, as well as the factors influencing the failure. An analysis of the failures of the critical components of the scaling machine has also been conducted and suggestions for improvement have been proposed.

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-5897 (URN)10.1080/17480930.2011.603515 (DOI)000309267300006 ()2-s2.0-84866865381 (Scopus ID)41510be7-faf8-4523-af21-0278a9d56241 (Local ID)41510be7-faf8-4523-af21-0278a9d56241 (Archive number)41510be7-faf8-4523-af21-0278a9d56241 (OAI)
Note
Validerad; 2012; 20120807 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Wijaya, A. R. (2012). Methods for availability improvements of a scaling machine system (ed.). (Doctoral dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Methods for availability improvements of a scaling machine system
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Scaling is the process of cleaning loose material from the roof, face and wall of the mine room in underground mining. The purpose of scaling is to make the mine room safe for the next operation. Due to the nature of the task, scaling has been identified as an operation with a high number of accident occurrences. The use of a scaling machine to replace hand scaling has successfully reduced the number of scaling-related accidents. However, due to the combination of a hostile environment (such as falling rock, dust, high humidity, etc.), the operation context (e.g. significant vibrations), and reliability and maintainability issues, the scaling machine is identified as one of the major contributors to unplanned downtime.The purpose of this research is to develop methods that can be used for identifying the availability related problems and improving the availability of the scaling machine system in a cost effective way. To achieve the purpose of this research, literature studies, case studies, and simulations study have been conducted. Empirical data have been collected from field measurements, document studies, interviews, and observations. For data analysis, theories and methodologies within reliability, availability and maintainability (RAM), ergonomics and optimization have been combined with the best practices from the related industry. A first result of this study is the development of a method for visualization of the downtime that provides a visualization of the downtime estimation and the precision and the uncertainty of the estimation at a given confidence level, as well as factors influencing the failure. Second result is the identification of components that significantly contribute to the downtime and the reason for that downtime (reliability and/or maintainability problem). Based on the failures analysis, suggestion for the improvement of the critical component is also proposed. Third result is the identification and analyzing of performance shaping factors (PSFs) that can affect to the reliability of scaling machine system. Fourth result is a proposed methodology that can help the design team to select which components of a system are needed to be improved and to which level the improvement should be done to optimize the availability of system in a cost effective way. Finally, the fifth result is a proposed method for a robust-optimum multi-attribute age-based replacement policy. The proposed approach can be used to determine the interval time for preventive replacement that provides a robust and optimum solution for a multi-attribute age-based replacement policy. These results are related to specific industrial challenges, and are expected to enhance the capability for improving the availability of the scaling machine system in a cost effective way. The results have been verified through interaction with experienced practitioners from both the manufacture and the user (i.e. mining company) of the scaling machine.

Abstract [sv]

Skrotning innebär att löst material rensas bort från tak, front och väggar för att minimera rasrisken vid underjordsbrytning. Syftet med skrotning är att göra gruvrummet säkert för nästkommande arbeten. Skrotning har identifierats som en av källorna till ett stort antal olyckor, vilket beror på de stora riskerna för nedfallande sten. Användandet av skrotare jämfört med manuell skrotning har också minskat antalet skrotningsrelaterade olyckor. På grund av kombinationen av en besvärlig miljö (till exempel fallande sten, damm, hög luftfuktighet etc.), drift faktorer (t.ex. betydande vibrationer), tillförlitlighet och underhållsmässighet är skrotningsmaskinen identifierad som en av de stora bidragsgivarna till oplanerade driftstopp.Syftet med forskningsprojektet är att utveckla metoder som kan användas för att identifiera tillgänglighetsrelaterade problem samt att förbättra tillgängligheten för skrotare på ett kostnadseffektivt sätt. För att uppnå detta syfte har litteraturstudier, fallstudier och en simuleringsstudie genomförts. Empiriska data har samlats in från fältstudier, dokumentstudier, intervjuer och observationer. Dataanalyser, teorier och metoder inom tillförlitlighet, tillgänglighet och underhållsmässighet (RAM) samt ergonomi och optimering har kombinerats med bästa praxis från industrin. Ett första resultat är utvecklandet av en metod för stilleståndstid vilket ger en visualisering av uppskattning och precision av denna samt osäkerheten i uppskattning vid en viss konfidensnivå. Andra resultat är identifikationen av de komponenter som bidrar väsentligt till stilleståndstid och dess anledningar (tillförlitlighets och/eller underhållsmässighetsproblem). Baserat på felanalyser har också förbättringar av de kritiska komponenterna föreslagits. Ytterligare resultat är identifiering och analys av prestandafaktorer som kan påverka tillförlitligheten i skrotarsystemet. Vidare har en metod utvecklats som kan hjälpa konstruktörna av skrotare att välja vilka komponenter i ett skrotarsystem som behöver förbättras och till vilken nivå detta bör ske för att optimera tillgängligheten av systemet på ett kostnadseffektivt sätt. Slutligen har en metod för att på ett robust sätt föreslå optimala bytesintervaller för ett flertal skrotarkomponenter samtidigt, utvecklats. De nya metoderna är verifierade och relaterade till specifika industriella utmaningar och förväntas förbättra förmåga hos användare och tillverkar, att förbättra tillgängligheten på ett kostnadseffektivt sätt.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2012. p. 44
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-25836 (URN)b5cb050f-2aa4-43e2-b994-17ef951f6273 (Local ID)978-91-7439-431-3 (ISBN)b5cb050f-2aa4-43e2-b994-17ef951f6273 (Archive number)b5cb050f-2aa4-43e2-b994-17ef951f6273 (OAI)
Note
Godkänd; 2012; 20120319 (andwij); DISPUTATION Ämnesområde: Drift och underhållsteknik/Operation and Maintenance Opponent: Professor Jan-Gunnar Persson, Institutionen för maskinkonstruktion, Kungliga Tekniska Högskolan, Stockholm Ordförande: Professor Jan Lundberg Institutionen för samhällsbyggnad och naturresurser, Luleå tekniska universitet Tid: Torsdag den 31 maj 2012, kl 10.00 Plats: F1031, Luleå tekniska universitetAvailable from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-24Bibliographically approved
Rantatalo, M., Wijaya, A., Lundberg, J., Thurley, M. & Fredriksson, H. (2012). Project: HLRC Pre-study: Owner-specific methods for production-increasing improvements of mining machinery. Paper presented at .
Open this publication in new window or tab >>Project: HLRC Pre-study: Owner-specific methods for production-increasing improvements of mining machinery
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2012 (English)Other (Other (popular science, discussion, etc.))
National Category
Other Civil Engineering Signal Processing Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Operation and Maintenance; Signal Processing; Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-36280 (URN)d8ff0d43-f52a-4365-93be-d5a50231c245 (Local ID)d8ff0d43-f52a-4365-93be-d5a50231c245 (Archive number)d8ff0d43-f52a-4365-93be-d5a50231c245 (OAI)
Note

Status: Pågående; Period: 01/06/2012 → 30/08/2016

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Wijaya, A., Lundberg, J. & Kumar, U. (2012). Robust-optimum multi-attribute age-based replacement policy (ed.). Paper presented at . Journal of Quality in Maintenance Engineering, 18(3), 325-343
Open this publication in new window or tab >>Robust-optimum multi-attribute age-based replacement policy
2012 (English)In: Journal of Quality in Maintenance Engineering, ISSN 1355-2511, E-ISSN 1758-7832, Vol. 18, no 3, p. 325-343Article in journal (Refereed) Published
Abstract [en]

Purpose - A common model in the age-based replacement policy is based on the cost attribute and assumes that the model parameters are known. In practice, the model parameters are estimated from limited historical data, which brings uncertainty into the model. Moreover, minimizing the cost is not the only goal of the maintenance activity. From the decision maker's point of view, the multi-attributes and the uncertainty of the age-based replacement policy are two important aspects to take into consideration in the decision-making process. The purpose of this paper is to propose an approach for a robust-optimum multi-attribute age-based replacement policy. Design/methodology/approach - The proposed approach is based on a combination of the multiattribute age-based replacement policy and robust design problem philosophy. A case study is provided for illustrating the application of the proposed method. Findings - It is found that the proposed approach can determine the interval time for preventive replacement that provides a robust and optimum solution for a multi-attribute age-based replacement policy. Practical implications - The proposed approach can be used by the decision maker in determining a robust-optimum interval time for preventive replacement of multi-attribute age-based replacement, a time interval which is not only optimum, but also robust. Originality/value - This paper presents an approach that simultaneously considers the multi-attributes and the uncertainty in the age-based replacement policy which is, to date, not available

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-8290 (URN)10.1108/13552511211265910 (DOI)2-s2.0-84865744522 (Scopus ID)6c7809f4-e728-4f84-82ae-d18d284b0cad (Local ID)6c7809f4-e728-4f84-82ae-d18d284b0cad (Archive number)6c7809f4-e728-4f84-82ae-d18d284b0cad (OAI)
Note
Validerad; 2012; 20120914 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Wijaya, A. & Lundberg, J. (2012). The effect of the operator, the mine room and their interaction on the measured vibration level of a scaling machine (ed.). Paper presented at . International Journal of Systems Assurance Engineering and Management, 3(2), 145-152
Open this publication in new window or tab >>The effect of the operator, the mine room and their interaction on the measured vibration level of a scaling machine
2012 (English)In: International Journal of Systems Assurance Engineering and Management, ISSN 0975-6809, E-ISSN 0976-4348, Vol. 3, no 2, p. 145-152Article in journal (Refereed) Published
Abstract [en]

The objective of the present study is to find out the effect of the operator, the mine room and their interaction on the vibration measured on a scaling machine. Vibration measurements were conducted for three different mine rooms and three different drivers. The vector sum value of the root-mean-square acceleration, the vector sum value of the acceleration dose and the kurtosis sum were utilized to quantify the measured vibration. The unbalanced two-way ANOVA and the Kramer-Tukey test were utilized for the statistical analysis. The results show that the operating styles of the drivers in performing scaling activity and their interaction with the mine rooms have no significant effect on the vector sum value of the acceleration, the vector sum value of the acceleration dose and the kurtosis sum value. The mine rooms have a significant effect on the kurtosis sum value and the vector sum value of the acceleration dose, but not on the vector sum value of the acceleration

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-9552 (URN)10.1007/s13198-012-0096-7 (DOI)2-s2.0-84868624762 (Scopus ID)83350c4c-c6e5-4981-af08-d3ca60a025c5 (Local ID)83350c4c-c6e5-4981-af08-d3ca60a025c5 (Archive number)83350c4c-c6e5-4981-af08-d3ca60a025c5 (OAI)
Note
Validerad; 2012; 20121119 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Dandotiya, R., Lundberg, J. & Wijaya, A. (2011). Evaluation of abrasive wear measurement devices of mill liners (ed.). Paper presented at . International Journal of COMADEM, 14(2), 3-17
Open this publication in new window or tab >>Evaluation of abrasive wear measurement devices of mill liners
2011 (English)In: International Journal of COMADEM, ISSN 1363-7681, Vol. 14, no 2, p. 3-17Article in journal (Refereed) Published
Abstract [en]

Measurement of the liner wear in the mill of an ore dressing plant is one of the critical parameters in the context of mill downtime and production performance. The total downtime cost during measurement can be reduced by a significant fraction by using appropriate measurement devices. Due to the different quality attributes of a measuring device, e.g. the cost, accuracy, reliability and accessibility, it is necessary to select an appropriate device based on the specific needs of the industry. The main aim of this study is to determine a unified measure or quality index for the service quality of the measurement device across selected attributes. Each quality index will then correspond to the total predicted usability of the particular measurement method based on the industry needs. Furthermore, this study includes test of selected measurement methods and discusses the advantages and disadvantages for the same. It also proposes a new concept of an indirect measurement method to reduce the downtime during inspection.

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-7959 (URN)66634a75-3d55-4fe2-916f-a32d1e3892e1 (Local ID)66634a75-3d55-4fe2-916f-a32d1e3892e1 (Archive number)66634a75-3d55-4fe2-916f-a32d1e3892e1 (OAI)
Note
Validerad; 2011; 20111124 (rajdan)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Wijaya, A., Lundberg, J. & Kumar, U. (2010). Graphical method for visualization of machine's downtime: case study of scaling machine (ed.). In: (Ed.), (Ed.), Proceedings of the 1st international workshop and congress on eMaintenance: . Paper presented at International Workshop and Congress on eMaintenance : 22/06/2010 - 24/06/2010 (pp. 99-106). : Luleå tekniska universitet
Open this publication in new window or tab >>Graphical method for visualization of machine's downtime: case study of scaling machine
2010 (English)In: Proceedings of the 1st international workshop and congress on eMaintenance, Luleå tekniska universitet, 2010, p. 99-106Conference paper, Published paper (Refereed)
Abstract [en]

Visualization is the foundation for human to understand as human think and create in a graphic world. By nature, maintenance activity is a multi discipline approach, where maintenance engineer should be able to convey their idea to people with various backgrounds. In this situation, visualization is a powerful mode; it can act as a bridge to eliminate the knowledge gap within the group. Knight (2001) developed Jack-knife diagram for visualizing total downtime and factors influencing the failure (failure frequency and mean downtime) in a point estimation. As failure data is a probabilistic in nature, it is important to look not only point estimation but also interval estimation, so the precision and uncertainty of estimation can be identified. This paper proposes a way of visualizing total downtime and factors influencing the failure (failure frequency and mean downtime) in interval estimation. Case study from scaling machines is used for illustration.

Place, publisher, year, edition, pages
Luleå tekniska universitet, 2010
National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-31370 (URN)5879ad40-aebf-11df-a707-000ea68e967b (Local ID)978-91-7439-120-6 (ISBN)5879ad40-aebf-11df-a707-000ea68e967b (Archive number)5879ad40-aebf-11df-a707-000ea68e967b (OAI)
Conference
International Workshop and Congress on eMaintenance : 22/06/2010 - 24/06/2010
Note
Godkänd; 2010; 20100823 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Kumar, R., Wijaya, A., Barabady, J., Markeset, T. & Kumar, U. (2009). Ergonomic and maintainability design issues in mining (ed.). Paper presented at International Symposium on Mine Planning and Equipment Selection : 16/11/2009 - 19/11/2009. Paper presented at International Symposium on Mine Planning and Equipment Selection : 16/11/2009 - 19/11/2009.
Open this publication in new window or tab >>Ergonomic and maintainability design issues in mining
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2009 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

Due to confined space and poor illumination in the mine the maintenance activities are difficult to perform which in turn leads to increased down time, cost and injuries. This also influences the productivity of maintenance personnel owing to stresses generated due to increased psychological and physiological demand on them. However, the industry has paid much less attention to the design of the mining machine in initial phase itself with respect to maintainability parameters leading to low productivity, increased maintenance time and increased likelihood of accidents during maintenance and operation of such equipment. The objective of the paper is to present ergonomics factors such as; anthropometery, human sensory, physiological and psychological application in relation to maintainability design issues in mining in order to reduce occupational risk factors and improved maintainability of the mining equipments leading to increased productivity.

Keywords
Technology - Industrial engineering and economy, Teknikvetenskap - Industriell teknik och ekonomi
National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-33982 (URN)812797d0-b3e2-11de-b4d6-000ea68e967b (Local ID)812797d0-b3e2-11de-b4d6-000ea68e967b (Archive number)812797d0-b3e2-11de-b4d6-000ea68e967b (OAI)
Conference
International Symposium on Mine Planning and Equipment Selection : 16/11/2009 - 19/11/2009
Note
Godkänd; 2009; Bibliografisk uppgift: Sider: 483-491; 20091008 (ruku)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Wijaya, A., Kumar, R. & Kumar, U. (2009). Implementing lean principle into mining industry issues and challenges (ed.). Paper presented at International Symposium on Mine Planning and Equipment Selection : 16/11/2009 - 19/11/2009. Paper presented at International Symposium on Mine Planning and Equipment Selection : 16/11/2009 - 19/11/2009.
Open this publication in new window or tab >>Implementing lean principle into mining industry issues and challenges
2009 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

The lean production concept has its origin in automotive industry and is widely used in manufacturing sectors. What makes its applicability in mining difficult is the dynamic nature of mining operations bringing high degree of uncertainty in various unit operations. To reduce the wastage of efforts, one needs to remove uncertainty and predict the process behaviour as correct as possible. Furthermore, to achieve lean approach in mining, the entire mining chain needs to be considered starting from Mine exploration, mine planning, drilling operation, blasting, loading and transportation, ore dressing processes, reclamation, etc. To be lean in mining is not only dependent on mine production systems consisting of equipments and machines but it also depends on quality and reliability of information flow in real time generating action plans. Also, the reliability and maintenance preparedness have major influence on the degree of waste being generated in the process. For example if ore body is not correctly delineated/characterised or drilling operations not performed correctly, wrong charging process and wrong loading process- all may lead to wastage of resources. In fact Lean production has its origin (leans on) in JIT, TQM and TPM. The common denominator of all these philosophies is the human in the process. To improve any process one needs to measure the current status so that any change in current status can be recorded. The paper presents issues and challenges associated with implementation of Lean Principles in Mining industries.

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-35811 (URN)a7cfb580-e63b-11de-bae5-000ea68e967b (Local ID)a7cfb580-e63b-11de-bae5-000ea68e967b (Archive number)a7cfb580-e63b-11de-bae5-000ea68e967b (OAI)
Conference
International Symposium on Mine Planning and Equipment Selection : 16/11/2009 - 19/11/2009
Note
Godkänd; 2009; Bibliografisk uppgift: Sider: 1-9; 20091211 (ruku)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
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