Optimizing control for large scale dynamic systems; general issues and case study results: Transmission operations optimizer for Toronto water system

2017 ◽  
Author(s):  
Krzysztof Malinowski ◽  
Jacek Blaszczyk ◽  
Alnoor Allidina
Keyword(s):  
Dynamic Systems ◽  
Large Scale ◽  
Water System ◽  
Study Results ◽  
Optimizing Control

scholarly journals Anatomical, morphological and phytochemical properties of Aegopodium alpestre Ledeb.: a case study of Kazakhstan

2020 ◽  
Vol 48 (3) ◽  
pp. 1473-1482
Author(s):  
Elzira A. KYRBASSOVA ◽  
Akmaral A. SARTAYEVA ◽  
Elmira M. IMANOVA ◽  
Nurdana N. SALYBEKOVA ◽  
Gulraikhan E. ZHANTEYEVA ◽  
...  
Keyword(s):  
Large Scale ◽  
Inorganic Compounds ◽  
Biologically Active Substances ◽  
Biologically Active ◽  
High Concentration ◽  
Vegetative Organs ◽  
Study Results ◽  
Cultivation Practice ◽  
Active Substances

This article deals with the phytochemical, morphological and anatomical investigation of ethanol-based extracts derived from the leaves and stems of the Aegopodium alpestre. The vegetative organs of A. alpestre were conserved according to Strasburger-Fleµming method using a 1:1:1 mixture of alcohol-glycerin-water. A total of 1200 ethanol-based extracts (2 from leaves and 2 from stem tissues per plant) were prepared using the Soxhlet extractor. All extracts were used to identify organic and inorganic compounds in the leaves and stems of the studied plant. Contents of biologically active substances, microelements, vitamins and amino acids were determined. This article is the first paper to display very high concentration and diversity of vitamins (6 types), micronutrients (5 types), and aminoacids (13 types) in the leaves and steams of A. alpestre. Findings conclude that identification of biologically active substances in the above the ground vegetative organs of A. alpestre may be a common practice in the future. Considering the study results, A. alpestre may be used as a medicinal plant on a large scale. For this, the cultivation practice needs to be scaled up.

Risk-Averse Optimization for Resilience Enhancement Under Uncertainty

2020 ◽  
Author(s):  
Jiaxin Wu ◽  
Pingfeng Wang
Keyword(s):  
Large Scale ◽  
Risk Measure ◽  
Recovery Process ◽  
Recovery Phase ◽  
Mixed Integer ◽  
Network Systems ◽  
Additional Risk ◽  
Deterministic Equivalent ◽  
Study Results

Abstract With the growth of complexity and extent, large scale interconnected network systems, e.g., transportation networks or infrastructure networks, become more vulnerable towards external disturbances. Hence, managing potential disruptive events during design, operating, and recovery phase of an engineered system therefore improving the system’s resilience is an important yet challenging task. In order to ensure system resilience after the occurrence of failure events, this study proposes a mixed integer linear programming (MILP) based restoration framework using heterogenous dispatchable agents. Scenario based stochastic optimization (SO) technique is adopted to deal with the inherent uncertainties imposed on the recovery process from the nature. Moreover, different from conventional SO using deterministic equivalent formulations, additional risk measure is implemented for this study because of the temporal sparsity of the decision making in applications such as the recovery from extreme events. The resulting restoration framework involves with a large-scale MILP problem and thus an adequate decompaction technique, i.e., modified Langragian Relaxation, is also proposed in order to achieve tractable time complexity. Case study results based on the IEEE 37-buses test feeder demonstrate the benefits of using the proposed framework for resilience improvement as well as the advantages of adopting SO formulations.

Multilevel strategies for the retrofit of large-scale industrial water system: A brewery case study

AIChE Journal ◽  
2011 ◽  
Vol 58 (3) ◽  
pp. 884-898 ◽  
Author(s):  
Hella Tokos ◽  
Zorka Novak Pintarič ◽  
Yongrong Yang ◽  
Zdravko Kravanja
Keyword(s):  
Large Scale ◽  
Water System ◽  
Industrial Water ◽  
System A

scholarly journals Economic Evaluation of Large-Scale Biorefinery Deployment: A Framework Integrating Dynamic Biomass Market and Techno-Economic Models

2020 ◽  
Vol 12 (17) ◽  
pp. 7126 ◽  
Author(s):  
Jonas Zetterholm ◽  
Elina Bryngemark ◽  
Johan Ahlström ◽  
Patrik Söderholm ◽  
Simon Harvey ◽  
...  
Keyword(s):  
Supply Chain ◽  
Economic Performance ◽  
Large Scale ◽  
Early Stage ◽  
Market Effects ◽  
Product Demand ◽  
Technical Performance ◽  
Study Results ◽  
End Use

Biofuels and biochemicals play significant roles in the transition towards a fossil-free society. However, large-scale biorefineries are not yet cost-competitive with their fossil-fuel counterparts, and it is important to identify biorefinery concepts with high economic performance. For evaluating early-stage biorefinery concepts, one needs to consider not only the technical performance and process costs but also the economic performance of the full supply chain and the impacts on feedstock and product markets. This article presents and demonstrates a conceptual interdisciplinary framework that can constitute the basis for evaluations of the full supply-chain performance of biorefinery concepts. This framework considers the competition for biomass across sectors, assumes exogenous end-use product demand, and incorporates various geographical and technical constraints. The framework is demonstrated empirically through a case study of a sawmill-integrated biorefinery producing liquefied biomethane from forestry and forest industry residues. The case study results illustrate that acknowledging biomass market effects in the supply chain evaluation implies changes in both biomass prices and the allocation of biomass across sectors. The proposed framework should facilitate the identification of biorefinery concepts with a high economic performance which are robust to feedstock price changes caused by the increase in biomass demand.

Dragon head enterprises in China's wine production – case study results

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Barbara Richter ◽  
Yanlin Yang ◽  
Jon H. Hanf
Keyword(s):  
Operating System ◽  
Large Scale ◽  
Integrated System ◽  
Wine Industry ◽  
Scale Production ◽  
Wine Production ◽  
Content Type ◽  
Study Results ◽  
Chinese Wine

PurposeIn 1998, the Chinese Communist Party introduced the strategy for modernizing agriculture with large-scale production and launching large commercial enterprises known as dragon head enterprises (DHEs) to process and market agricultural products. Although scholars have raised awareness of the development of DHEs in China, there has been little investigation on DHEs in the Chinese wine business. Based on the existing theoretical background on the concept of DHEs, this study aims to identify the structure and operating system of a DHE in the Chinese wine business. Changyu is chosen as an example because it is the oldest and largest wine company in China, operating in various grape-growing regions.Design/methodology/approachDue to the research's explorative character, the qualitative approach and case study focus were considered adequate. In-depth interviews have been conducted with the employees of the company. The authors analysed data with a qualitative content approach of Gläser and Laudel (2010).FindingsResults show that the grape procurement of Changyu is organized in an integrated system, which consists of the DHE (Changyu), the Changyu-led cooperative, and the grape producers who have a contract with the cooperative. The company takes different measures in terms of intra-organizational coordination to secure the required quantities and qualities of its grape supply base.Research limitations/implicationsIn this research, the authors could only access three interview partners of Changyu's grape procurement department, and it was not possible to conduct interviews with the management of Changyu. Another limitation is that it is difficult to collect adequate data in the Chinese wine industry.Originality/valueThere has been little investigation on DHEs in the Chinese wine business. This research contributes to the existing literature as it takes a closer look at the structure and operating system of a DHE in the Chinese wine business. The case study and chosen example (Changyu) allow a better understanding of DHEs and provide first insights into their operating principle.

Conservation of the false water rat (Xeromys myoides) depends on landscape complementation

2009 ◽  
Vol 31 (2) ◽  
pp. 81 ◽  
Author(s):  
Tanya L. Russell ◽  
Peter T. Hale
Keyword(s):  
Large Scale ◽  
Habitat Preferences ◽  
Suitable Habitat ◽  
Patch Occupancy ◽  
Landscape Complementation ◽  
Study Results ◽  
Solid Foundation ◽  
Animal Presence ◽  
Habitat Variables

Identification of habitat variables that are associated with patch occupancy can provide a solid foundation for conservation, especially when habitats and landscapes are affected by human activities. As a case study to investigate the importance of landscape complementation and habitat quality for conservation, we examined the habitat preferences of a vulnerable native rodent, the false water rat (Xeromys myoides Thomas). In this study, results from surveys for animal presence and recording of habitat attributes in localities in south-east Queensland showed that X. myoides prefers a habitat with a wide mangrove zone of short mangroves and a high percentage of relatively tall vegetation cover in the sedge/saltmarsh zone. The absence of X. myoides from areas of likely habitat at a large scale can be attributed, at least in part, to the local habitat variables that overrode predictions based at a large scale. The findings suggest that availability of suitable habitat is a factor limiting the distribution and abundance of X. myoides. It is clear that landscape complementation influences patch occupancy and should be an essential consideration for conservation programs.

scholarly journals Economic Evaluation of Large-Scale Biorefinery Deployment: A Framework Integrating Dynamic Biomass Market and Techno-Economic Models

2020 ◽  
Author(s):  
Jonas Zetterholm ◽  
Elina Bryngemark ◽  
Johan Ahlström ◽  
Patrik Söderholm ◽  
Simon Harvey ◽  
...  
Keyword(s):  
Supply Chain ◽  
Economic Performance ◽  
Large Scale ◽  
Early Stage ◽  
Market Effects ◽  
Product Demand ◽  
Technical Performance ◽  
Study Results ◽  
End Use

Biofuels and biochemicals play significant roles in the transition towards a fossil-free society. However, large-scale biorefineries are not yet cost-competitive with their fossil-fuel counterparts, and it is important to identify biorefinery concepts with high economic performance. For evaluating early-stage biorefinery concepts, one needs to consider not only the technical performance and process costs but also the economic performance of the full supply chain and the impacts on feedstock and product markets. This article presents and demonstrates a conceptual interdisciplinary framework that can constitute the basis for evaluations of the full supply-chain performance of biorefinery concepts. This framework considers the competition for biomass across sectors, assumes exogenous end-use product demand, and incorporates various geographical and technical constraints. The framework is demonstrated empirically through a case study of a sawmill-integrated biorefinery producing liquefied biomethane from forestry and forest industry residues. The case study results illustrate that acknowledging biomass market effects in the supply chain evaluation implies changes in both biomass prices and the allocation of biomass across sectors. The proposed framework should facilitate the identification of biorefinery concepts with a high economic performance which are robust to feedstock price changes caused by the increase in biomass demand.

The effect of resistance in organizational change programmes

2015 ◽  
Vol 7 (2/3) ◽  
pp. 274-295 ◽  
Author(s):  
Jason Canning ◽  
Pauline Anne Found
Keyword(s):  
Organizational Culture ◽  
Organizational Change ◽  
Large Scale ◽  
Resistance To Change ◽  
Weight Of Evidence ◽  
Contributing Factors ◽  
Content Type ◽  
New Model ◽  
Study Results

Purpose – The purpose of this paper is to investigate the contributing factors that lead to resistance to change, and to ascertain the relationship between organizational culture and employee resistance in organizational change programmes, such as lean. Design/methodology/approach – The methodology for this research is in three main parts. Firstly, a systematic review of the literature pertaining to resistance to change is, secondly, followed by a case study involving an anonymous survey and semi-structured interviews to test the assumptions drawn from the literature. Finally, the literature research and case study results are drawn together to present a new model of resistance. Findings – The finding of the literature, along with the finding of the case study confirm that lack of communication and participant involvement during change are highlighted as significant contributing factors to resistance and that these are related to organizational culture. Research limitations/implications – Whilst the secondary sources of information provide a significant weight of evidence to support the results from the case study, the results of the research are based on a single case study; therefore, caution should be applied before making generalizations from the data. Practical implications – The findings can provide organizations, and change practitioners, with an insight into a number of the issues that should be considered in relation to an organizations culture before attempting large-scale change programmes. Originality/value – The research findings provide a new model, the “resistance model” that identifies the interconnected issues that affect employees’ attitude to, and thus acceptance of, organizational change.

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