scholarly journals Optimizing Flotation Circuit Recovery by Effective Stage Arrangements: A Case Study

Minerals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 417 ◽  
Author(s):  
Vahid Radmehr ◽  
Sied Shafaei ◽  
Mohammad Noaparast ◽  
Hadi Abdollahi
Keyword(s):  
General Rule ◽  
Optimal Recovery ◽  
Operational Parameters ◽  
Matlab Software ◽  
One Stage ◽  
Additional Costs ◽  
Circuit Configuration

Recovery is one of the most important metallurgical parameters in designing and evaluating flotation circuits. The present study used the recovery arrangement for two and three stage circuits to evaluate the effect of stage recovery on the overall circuit recovery and flotation circuit configuration. The results showed that mainly the highest recovery value should be assigned to the rougher stage in order to achieve the maximum overall circuit recovery. Countercurrent rougher-cleaner and rougher-scavenger circuits, in which recycling streams step back one stage at a time, follow a general rule for the assignment of recovery. Finally, a flotation plant containing six flotation banks was examined as a case study. A program for calculating total circuit recovery, for all possible combinations of recovery was developed in MATLAB software. 720 recovery combinations were evaluated. The results showed that optimal recovery allocation in stages could be effective in achieving overall circuit recovery. It was shown that the use of a large number of stages in some of the flotation circuits leads to the loss of equipment and additional costs. The proposed approach can be employed as an effective tool for designing and optimizing various flotation circuits and their operational parameters.

A little help from my friends: how purchasing gains influence in complex business-to-business services: the case of legal

2017 ◽  
Vol 32 (2) ◽  
pp. 206-217 ◽  
Author(s):  
Wendy L. Tate ◽  
Lisa M. Ellram ◽  
Ulrich Schmelzle
Keyword(s):  
Supplier Management ◽  
Positive Contribution ◽  
Business Service ◽  
Case Study Method ◽  
Business Services ◽  
Content Type ◽  
Additional Costs ◽  
Service Procurement ◽  
Business To Business

Purpose The purpose of this research is to develop an understanding of how purchasing can become meaningfully involved in complex business-to-business service purchases. Design/methodology/approach A single in-depth case study method of an exemplar organization was applied to better understand the purchasing function’s role in adding to the value proposition in complex, non-traditional business-to-business service purchases. Findings Powerful allies or advocates can mediate purchasing involvement in service procurement. However, once the involvement is initiated, purchasing must make a positive contribution with respect to the specific needs and expectations of the budget owner to retain its influence. Research limitations/implications This research extends institutional theory to show how powerful allies or advocates can mediate purchasing involvement in the complex services spend. Practical implications This study describes the potential impact of purchasing’s involvement in complex services spend and highlights the opportunities for purchasing managers to improve supplier management and drive out additional costs. Originality/value For the business practitioner, this research provides evidence regarding how individual functions can gain influence in the organization. A conceptual model describes the meaningful involvement of purchasing in complex business-to-business service purchases.

The Application of MATLAB Software on the College Network Teaching Platform of the Mathematics Experiment

2011 ◽  
Vol 55-57 ◽  
pp. 1459-1463
Author(s):  
Yun Fa Li
Keyword(s):  
Matlab Software ◽  
Network Teaching ◽  
Teaching Platform ◽  
Network Platform

In order to improve the teaching level of mathematics experiment of college and establish the network teaching platform and the study on the application of MATLAB on the mathematics experiment was carried out. Firstly, the MATLAB software was introduced; and then the application of the MATLAB on the mathematics experiment of college network platform was analyzed. Case study of MATLAB application was put forward.

Parameters affecting nitrifying biofilm reactors

1994 ◽  
Vol 29 (10-11) ◽  
pp. 1-11 ◽  
Author(s):  
M. Boller ◽  
W. Gujer ◽  
M. Tschui
Keyword(s):  
High Energy ◽  
Experimental Investigations ◽  
Operational Parameters ◽  
Oxygen Utilization ◽  
Trickling Filters ◽  
Biofilm Reactors ◽  
Biomass Activity ◽  
Rotating Biological Contactors ◽  
High Energy Consumption

The variables affecting nitrification in biofilms are identified on a theoretical basis. The influence of various design and operational parameters which affect the resulting substance fluxes into and out of the biofilm and the biomass activity regarding nitrification are illustrated with the help of experimental investigations with plastic media trickling filters, rotating biological contactors and different aerated biofilters. The results of experiments with these systems in tertiary nitrification applications reveal process limitations and technical measures to enhance nitrification performance in each system. In a case study, a comparison between the different biofilm processes and activated sludge alternatives showed that biofilm systems may lead to remarkably smaller reactor volumes, but high energy consumption due to unfavorable oxygen utilization.

scholarly journals Road-safety recognition and network equilibrium with perceived route-choice sets

2019 ◽  
Vol 1 (2) ◽  
pp. 126-134
Author(s):  
Mao-sheng Li ◽  
He-lai Huang
Keyword(s):  
Convex Combination ◽  
Route Choice ◽  
User Equilibrium ◽  
Equilibrium Analysis ◽  
Combination Method ◽  
Crash Frequency ◽  
Traffic Demand ◽  
Additional Costs ◽  
Choice Set

Abstract Safety is regarded as the second basic need in Maslow’s hierarchy of needs (1943), and safety recognition and circumvention behaviour in the route-choice decision-making process should therefore be accommodated in network-traffic equilibrium analysis frameworks. This paper proposes a framework by which crash frequency, forecasted using the safety-analysis method or compiled from historical data for intersections, is used to measure the safety consciousness of drivers. Drivers are then classified into different groups according to their acceptable-risk thresholds, and each group has its own route-choice set. Decision behaviour whereby drivers are willing to bear additional costs in order to circumvent travel risk is incorporated into the variational inequality model based on the user equilibrium in the perceived route-choice set (UE-PRCS), which is an extension of Wardrop’s first principle. The Frank–Wolfe algorithm, based on the convex combination method, is employed to obtain the solution. A small road network is used as a case study to illustrate the proposed framework, incorporating risk recognition and circumvention behaviour under different combinations of traffic demand and risk-sensitivity group ratio. The results show that the standard user equilibrium is a special case of the UE-PRCS, but that the UE traffic state is more common than the UE-PRCS under different parameters.

scholarly journals Research on Optimization of Port Container Inland Collection and Distribution Network

2020 ◽  
Vol 165 ◽  
pp. 06024
Author(s):  
Xuan Wang ◽  
Yun Jing
Keyword(s):  
Distribution Network ◽  
Distribution Networks ◽  
Development Strategies ◽  
Optimal Model ◽  
Matlab Software ◽  
Belt And Road ◽  
Network Costs ◽  
The Belt And Road

With the advancement of country’s “the Belt and Road” strategy, each port is actively formulating development strategies to help implement the strategy. The port inland collection and distribution network is an important guarantee for the development of the port, and it is a key component to promote the connection between the port and the inland hinterland. It has an important role in expanding the scale of the port and improving the overall competitiveness of the port. Aiming at the current imbalance of the collection and distribution methods and the imperfect collection and distribution networks in most ports, this paper establishes an optimal model of collection and distribution network costs and quantitatively optimizes the collection and distribution network corridors. The Tianjin Port is selected as a case study object. And the MATLAB software is used to solve the analysis. The conclusion is that Tianjin Port could alleviate the pressure of the collection and distribution network by increasing the density of container trains with the hinterland cities, which verified the validity of the model.

scholarly journals Application of electrocoagulation for water conditioning

2019 ◽  
Vol 6 (2) ◽  
pp. 59-70
Author(s):  
Hana Posavčić ◽  
Ivan Halkijević ◽  
Živko Vuković
Keyword(s):  
Water Source ◽  
Point Of View ◽  
Pollutant Removal ◽  
Operating Costs ◽  
Mechanical Equipment ◽  
Operational Parameters ◽  
Economic Point ◽  
Water Conditioning ◽  
Electrocoagulation Process

Water conditioning is a method of removing altering minerals, chemicals and contaminants from a water source and it is carried out on facilities equipped with the corresponding electro-mechanical equipment. Although efficient, conventional processes typically use several complex devices connected to a single functional unit, which are often expensive to maintain and occupy large areas. Therefore, the aim of this paper is to present the electrocoagulation (EC) method as an alternative to conventional water conditioning processes. The examples of previous studies of the EC process application is presented in this paper. The focus of the paper is to investigate the influence of the certain operational parameters such as pH, temperature, electrode material, etc., on the efficiency of pollutant removal such as Escherichia coli and elevated concentrations of iron, arsenic, manganese, ammonia and others. Further, an economic analysis is made, which, from an economic point of view, shows when it is feasible to use the EC in the conditioning process. Furthermore, a case study of electrocoagulation process for Total Nitrogen (TN) removal is presented. According to results, 69.7 % of TN was removed with aluminum electrodes after 240 minutes. For this case, total operating costs were 7.60 €/m3.

scholarly journals Modeling the wasted value of data in maintenance investments

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Salla Marttonen-Arola ◽  
David Baglee ◽  
Antti Ylä-Kujala ◽  
Tiina Sinkkonen ◽  
Timo Kärri
Keyword(s):  
Data Model ◽  
Academic Research ◽  
Content Type ◽  
Investment Appraisal ◽  
Current Asset ◽  
Automotive Parts ◽  
Additional Costs ◽  
Industrial Maintenance ◽  
The Moment

PurposeBig data and related technologies are expected to drastically change the way industrial maintenance is managed. However, at the moment, many companies are collecting large amounts of data without knowing how to systematically exploit it. It is therefore important to find new ways of evaluating and quantifying the value of data. This paper addresses the value of data-based profitability of maintenance investments.Design/methodology/approachAn analytical wasted value of data model (WVD-model) is presented to quantify how the value of data can be increased through eliminating waste. The use of the model is demonstrated with a case example of a maintenance investment appraisal of an automotive parts manufacturer.FindingsThe presented model contributes to the gap between the academic research and the solutions implemented in practice in the area of value optimization. The model provides a systematic way of evaluating if the benefits of investing in maintenance data exceed the additional costs incurred. Applying the model to a case study revealed that even though the case company would need to spend more time in analyzing and processing the increased data, the investment would be profitable if even a modest share of the current asset failures could be prevented through improved data analysis.Originality/valueThe model is designed and developed on the principle of eliminating waste to increase value, which has not been previously extensively discussed in the context of data management.

scholarly journals Risk Identification in Cogeneration (Combined Heat and Power) Projects: A Polish Case Study

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 42
Author(s):  
Joanna Rzempała ◽  
Daniel Borkowski ◽  
Artur Piotr Rzempała
Keyword(s):  
Risk Factors ◽  
Combined Heat And Power ◽  
Risk Identification ◽  
Correct Identification ◽  
Financial Risks ◽  
Planning Stage ◽  
Technical Errors ◽  
Additional Costs ◽  
Planning And Construction

The purpose of the article is to define the risk factors in cogeneration projects and to demonstrate that a lack of sufficient identification of risks in different phases affects project implementation. A theoretical study is conducted, which aims to identify risk factors in cogeneration projects, based on case studies of such projects in Poland. The study offers a view at CHP (combined heat and power) projects as extremely dependent on the external environment of the organisation. These projects are subject to many external regulations due to their environmental impact and dynamically changing technical aspects. The biggest technical errors occur at the planning and construction stages. The biggest economic and financial risks occur at the execution stage after 2% and 3% of additional design costs occur, respectively. The authors estimated the risks at different stages of the project and concluded that the total cost of failure in correct identification of the risks at the planning stage exceeded PLN 1.5 billion, which amounted to almost 60% of the total additional costs of materialised project risk. Consequently, the biggest challenges in the area of CHP project management at the planning stage are a thorough identification of risks, and the pricing and planning reactions to risk.

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