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- Andersson, Dan, 1966, et al.
(författare)
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Wave-breaking-free pulses in nonlinear-optical fibers
- 1993
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Ingår i: Journal of the Optical Society of America B: Optical Physics. - 1520-8540 .- 0740-3224. ; 10:7, s. 1185-1190
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Tidskriftsartikel (refereegranskat)abstract
- A qualitative as well as quantitative investigation is made of the conditions for avoiding wave breaking during pulse propagation in optical fibers. In particular, it is shown that pulses having a parabolic intensity variation are approximate wave-breaking-free solutions of the nonlinear Schrodinger equation in the high-intensity limit. A simple expression for the compression factor of a fiber-grating compressor based on parabolic pulses is also derived.
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- Agrawal, Tarun, 1989, et al.
(författare)
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Automating Loading and Unloading for Autonomous Transport: Identifying Challenges and Requirements with a Systems Approach
- 2023
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Ingår i: IFIP Advances in Information and Communication Technology. - 1868-4238 .- 1868-422X. - 9783031436697 ; 691 AICT, s. 332-345
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Konferensbidrag (refereegranskat)abstract
- The logistics industry has undergone significant changes due to high demand, competition, cost pressures, interruptions, and labor market limitations affecting supply chains. As a result, there has been a significant adoption of automation in internal logistics such as warehousing, stock control, and material handling, leading to increased organizational competitiveness by reducing manual labor costs and time spent on these operations. The use of autonomous road transport holds potential to improve transport performance within areas of safety, sustainability, and efficiency. However, for autonomous transport to be fully ealized, loading and unloading processes at shipping and receiving facilities must also be automated. This paper takes a systems approach to identify the challenges and requirements for automated loading and unloading in a setting of autonomous truck transport potentially within a production setting. By addressing these challenges and meeting the necessary requirements, it may be possible to fully realize the benefits of autonomous transport and improve overall transport performance.
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- Amiri, Haleh, 1966-
(författare)
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Patterns and Processes of Molecular Evolution in Rickettsia
- 2002
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Species of the genus Rickettsia are obligate intracellular parasites of the a-proteobacterial subdivision. It has been suggested that obligate intracellular bacteria have evolved from free-living bacteria with much larger genome sizes. Transitions to intracellular growth habitats are normally associated with radical genomic alterations, particularly genome rearrangements and gene losses.This thesis presents a comparative study of evolutionary processes such as gene rearrangements, deletions and duplications in a variety of Rickettsia species. The results show that early intrachromosomal recombination events mediated by duplicated genes and short repeats have resulted in deletions as well as rearrangements. For example, an exceptional organization of the elongation factor genes was found in all species examined, suggesting that this rearrangement event occurred at the early stage of the evolution of Rickettsia. Likewise, it was found that a repetitive element, the so-called Rickettsia Palindromic Element (RPE) flourished prior to species divergence in Rickettsia. Finally, a phylogenetic analysis shows that the duplication events that gave rise to the five genes encoding ATP/ADP transporters occurred long before the divergence of the two major groups of Rickettsia. Taken together, this suggests that Rickettsia have been intracellular parasites for an extensive period of time.A detailed analysis of the patterns of nucleotide changes in genes and intergenic regions among the different species provides evidence for a gradual accumulation of short deletions. This suggests that different distributions of genes and repeated sequences in modern Rickettsia species reflect species-specific differences in rates of deterioration rather than variation in rates of intra-genomic sequence proliferation.
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- Andersson, Dan, 1966, et al.
(författare)
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A TOTAL COST TOOL FOR INTERNALISING LOGISTICS AND ENVIRONMENTAL EXTERNALITIES
- 2013
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Ingår i: 2013 Logistics Research. - 9781904564478
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Konferensbidrag (refereegranskat)abstract
- Purpose: It is becoming increasingly important to analyze the environmental impact and overall effectiveness of goods transport systems. When making decisions that will have short or long term effects on these systems there is a need to understand their consequences thereby it is necessary to measure and evaluate different options. The impact of transport on the environment, climate, health and other factors can be calculated as external costs and be internalized. Also in logistics there are a number of costs that are intangible and very hard to calculate, for instance service deficiency costs which also needs to be internalized and become a part of the total cost. The purpose of this paper is to develop and evaluate a tool that can be used to analyse the potential effect of different ways to improve transport of goods on the overall logistics system performance. The tool should combine both economical and environmental performance objectives by providing estimates and corresponding uncertainties of: 1) transport efficiency and effectiveness, expressed as total logistics cost, and 2) environmental and other external interference, expressed as external costs.Research approach: The calculation tool is used in a case study to in in order understand the need for and availability of data needed for the using the analysis tool. In order to capture the intrinsic uncertainties in these types of models, uncertainty calculations are made.Findings and Originality: The result is a total cost analysis model, which takes uncertainty into account when analyzing the environmental impact and overall effectiveness of goods transport systems. By internalizing external effects it is possible to give a certain indication of the effect of different proposed logistics changes.Practical Impact: The new tool can be helpful for decision makers at different hierarchical levels in an organization. From tactical decisions regarding goods transports but also strategic decision making regarding for instance localization of production units and warehouses. There is a need for better understanding of the long-term effects of transport decision and how these will be influenced if the full cost of environmental effects is considered. By improving this understanding the environmental impact caused by goods transport may be reduced at the same time as the competitiveness of the companies may be increased.
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- Andersson, Dan, 1966-, et al.
(författare)
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Coordinate to enhance third party logistics relationships
- 2007
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Ingår i: The International Journal of Integrated Supply Management. - 1477-5360 .- 1741-8097. ; 3:1, s. 69-85
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Tidskriftsartikel (refereegranskat)abstract
- This article emphasise the importance of coordination in Third Party Logistics (TPL) and describes how coordination can be managed. This is inspired by Key Account Management (KAM) literature and supported by empirical evidence. Buyers of TPL services currently perceive KAM as focusing on making sales and on negotiating contracts. This article proposes that KAM may have a material impact on TPL relationships and that this function can be developed further, primarily by having a coordination role. The article contains a coordination model based on both internal and external coordination of activities within a dyad, divided into operational, functional, geographic, and development coordination. The model explains how these types of coordination can integrate functions and contents in different alliance phases to build successful TPL relationships. Copyright © 2007 Inderscience Enterprises Ltd.
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