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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
351

Partial Circuit Replication for Masking and Detecting Soft Errors in SRAM-Based FPGAs

Keller, Andrew Mark 08 December 2021 (has links)
Partial circuit replication is a soft error mitigation technique that uses redundant copies of a circuit to mask or detect the effects of soft errors. By masking or detecting the effect of soft errors on SRAM-based FPGAs, implemented circuits can be made more reliable. The technique is applied selectively, to only a portion of the components within a circuit. Partial application lowers the cost of implementation. The objective of partial circuit replication is to provide maximal benefit at limited or minimized cost. The greatest challenge of partial circuit replication is selecting which components within a circuit to replicate. This dissertation advances the state of the art in the effective use of partial circuit replication for masking and detecting soft errors in SRAM-based FPGAs. It provides a theoretical foundation in which the expected benefits and challenges of partial circuit replication can be understood. It proposes several new selection approaches for identifying the most beneficial areas of a circuit to replicate. These approaches are applied to two complex FPGA-based computer networking systems and another FPGA design. The effectiveness of the selection approaches are evaluated through fault injection and accelerated radiation testing. More benefit than expected is obtained through partial circuit replication when applied to critical components and sub-regions of the designs. In one example, in an open-source computer networking design, partial circuit replication masks and detects approximately 70% of failures while replicating only 5% of circuit components, a benefit-cost ratio of 14.0.
352

DESIGN OF SECONDARY AIR SYSTEM AND THERMAL MODELS FOR TRIPLE SPOOL JET ENGINES

CATY, Fabien January 2012 (has links)
This master thesis deals with the understanding of the secondary air system of athree spool turbofan. The main purpose is the creation of secondary air systemand thermal models to evaluate the behavior of this kind of engine architectureand estimate the pros and cons in comparison with a typical two spool turbofan. Afinite element model of the secondary air system of the engine has been designedbased on the experience of typical jet engines manufactured by Snecma. Theinner thermodynamic pattern and mass flow rates of the engine were obtained.Some local improvements were then made by making analogies with the enginesmanufactured by Snecma. After having communicated the results to theperformance unit to get updates thermodynamic cycles, a quite reliable model wasobtained and
353

Supplemental irrigation of cereals in semi-arid areas in Ethiopia - is it worth the effort?

Ristinmaa, Kristoffer January 2015 (has links)
With a growing world population, estimated to 9.6 billion in 2050, the world food demand is estimated to increase with 45-50 %. One way to meet the demand is to increase the areal yield from the agricultural sector, where rain-fed agriculture has the highest potential. 95 % of the agriculture in Sub-Saharan Africa is rain-fed and the same region is predicted to holds the largest share of poor people in 2015. Since 40-70 % of the rural households highly depend of on-farm sources, investments to increase the agriculture productivity target both the poverty alleviation in the region as well as the world’s food security. By a tripartite methodology, this study analyzed the use of small-scale rain water harvesting (RWH) ponds for supplemental irrigation (SI) of cereals to reduce the inter-annual variability and to increase the areal yield in semi-arid areas in Ethiopia. A physically based simulation model (CoupModel) considering the plant-soil-atmosphere system was used to study how a C4-plant responded to different irrigation scenarios with 30 years climate data (1980-2009) from six regions in Ethiopia. Moreover, two years field data with maize yield from Triple Green project’s experimental fields in Ethiopia was used to analyze the correlation between SI and yield. Finally, ten farmers that used RWH ponds for SI of cereals within Triple Green project were interviewed to find out their perception of the RWH and SI. The model results showed that irrigation almost eliminated the inter-annual variability and increased the areal yield for all the climates. SI was most efficiently used in areas with more than 900 mm precipitation/year were the two annual rain periods could be bridged to create a prolonged growth season (>180 days). The mean annual irrigation water demand was estimated to 224 mm distributed over 7 irrigation events. The field results showed a moderate but significant 10 % increase of the areal yield with SI. None of the farmers wanted to use the RWH for SI of cereals, instead they wanted to use it to water their livestock, grow cash crop seedlings and fruit trees. If the future world food demand is to be targeted, the study suggests societal investments to build infrastructure to collect, store and distribute water for irrigation.
354

Transducción de señales mediada por el regulador multifuncional PipX EN Synechococcus sp. PCC 7942

Obrebska, Anna 07 July 2017 (has links)
No description available.
355

Inkluderandet av hållbarhetsarbete inom byggprojekt och dess relation till projektframgång : En kvalitativ studie om relationen mellan hållbarhetsarbete och projekt

Eriksson, Elin, Jähle, Josefine January 2021 (has links)
Title: The inclusion of sustainability in construction projects and its relation to project success: a qualitative study of the relationship between sustainability and projects. Level: Student thesis, final assignment for Bachelor Degree in Business Administration  Author: Elin Eriksson and Josefine Jähle Supervisor: Emilia Kvarnström Date: 2021 - June  Aim: Previous research draws attention to the negative connection between integrating sustainability into projects with a focus on long-term sustainability goals as opposed to short-term traditional project goals. Therefore, researchers suggest that more empirical studies should be conducted in the subject. The purpose of the study is to create an increased understanding of the relationship between sustainability and projects through the research questions “How is sustainability included in projects?” and “What is the perceived relationship between sustainability and project success?”.  Method: To achieve the purpose of the study, a qualitative method has been used in the form of six semi-structured interviews with project managers and people with different sustainability positions within Swedish construction companies. The collected data has been transcribed and coded into recurring themes which were analyzed through a content analysis.  Result & Conclusions: The study shows that the customer for the projects can act as an opening or barrier for how sustainability is included within projects. The results also show that the entire supply chain can influence the inclusion of sustainability. According to this study, the relationship between sustainability work and project success is difficult to determine, which is explained by the fact that sustainability is actually a part of project success. Thus, the study has resulted in the model “The Sustainable Iron Triangle”.  Contribution of the thesis: This study has contributed to an increased theoretical understanding of the relationship between sustainability and projects, but also provides an empirical basis on whether sustainability is included in projects and its relation to project success. This study has developed the model The Iron Triangle into The Sustainable Iron Triangle which better reflects today's assessment of project success.  Suggestions for future research: Future studies are recommended to carry out similar surveys regarding construction companies outside Sweden or to examine the customer's perceptions regarding the inclusion of sustainability in projects. What also would be interesting is to test The Sustainable Iron Triangle in an industry other than the construction industry to examine the relevance of the model in another context.  Key words: Project, Sustainability, Project Management, Triple Bottom Line, Project Success, The Iron Triangle.
356

Implementation of Technology in Warehouse Operations : A case study on internal logistics in warehouses from a sustainable perspective

Rylander, Lisa, Olofsson, Frida January 2021 (has links)
No description available.
357

The role of sustainable purpose in today’s entrepreneurship : An empirical study

Heindl, Lilly, Hies, Pascal January 2021 (has links)
Purpose of the study. This thesis deals with the role of sustainable purpose in the formation of sustainable start-ups. It aims to determine if sustainable purpose was a reason to start a company, what caused the emergence of sustainable purpose within the entrepreneurs, and how this purpose can benefit the enterprise. The study design. The study first defines sustainable purpose by juxtaposing selected concepts, models, and frameworks that aim to harmonize doing business and positive contribution to the planet and people. Based on that, we conducted semi-structured interviews with founders of sustainable start-ups (N=9). These were analysed via a qualitative content analysis and cross evaluation. Major findings. The findings were divided into six major categories. Interviewees contributed knowledge and opinion about their founding motivations, their source of sustainable purpose, how sustainable purpose benefits their business, what their view on sustainability is, what they criticise about today’s business world, and what the characteristics of themselves and their business are. Summary of interpretation. The collected data suggests that sustainable purpose was a reason for entrepreneurs to start a business that positively impacts society and the planet. Impactful life events influenced entrepreneurs to think critically about doing business and contributing to a better world. These impactful life events can be identified as the source of sustainable purpose within entrepreneurs. Lastly, entrepreneurs did identify benefits of having a sustainable purpose.
358

Jordbruk som innovationsnätverk : Hur påverkar närhet och distans innovationen?

Sjögren, Henry, Embaye, Elias January 2021 (has links)
As society moves towards being more and more digitalised, so does agriculture as well. Hopefully these digital tools will help us reach environmental goals through optimizing the use of resources in the agricultural sector. However, there are a few barriers to overcome for the digital transition to run smoothly. This thesis investigates a small portion of the agricultural innovation network in Sweden. This is done through multiple interviews and literary research. We can clearly see how this innovation network during the last decades has moved towards becoming more knowledge centered and how the model triple helix now easily can be applied to the network. The network is then analysed using Ron Boschma’s five proximity factors and it becomes clear that concerning the agricultural innovation network, the cognitive and institutional proximity is of great importance for the innovational strength. It also becomes clear that the different proximity factors seldom act alone, but instead build upon each other to increase the negative respectively positive outcomes. Moreover it is shown that regarding the agricultural innovation network in Sweden, it can only benefit from improving the proximity factors, which is different from other types of industries.
359

Vnější dimenze sociálního pilíře CSR ve Škoda Auto : aktivity firmy a místní komunita / External Dimension of CSR Social Pillar in Škoda Auto

Šindelková, Anna January 2013 (has links)
The thesis External dimension of CSR social pillar in Škoda Auto: company's activities and local community deals with the company's activities, which have an impact on the community of Mladá Boleslav. Particular focus is given to external dimension of social pillar of CSR. However the other activities, which are not declared as part of CSR.but have some impact on the local community, are also described in the thesis. One of the main goals of the thesis is to find out how the local NGOs percieve these activities and if they are trying to actively influence the CSR strategy of the company. The research is based on contemporrary theories in CSR, moreover the concept of cross-sectoral partnership is used. The output of the thesis is the evaluation of external dimension of CSR social pillar in Škoda Auto and proposal of new strategy, based on the collaboration with the local stakeholders using the topics suitable to cross-sectoral partnership.
360

Jump Shrug Height and Landing Forces Across Various Loads

Suchomel, Timothy J., Taber, Christopher B., Wright, Glenn A. 01 January 2016 (has links)
The purpose of this study was to examine the effect that load has on the mechanics of the jump shrug. Fifteen track and field and club/intramural athletes (age 21.7 ± 1.3 y, height 180.9 ± 6.6 cm, body mass 84.7 ± 13.2 kg, 1-repetition-maximum (1RM) hang power clean 109.1 ± 17.2 kg) performed repetitions of the jump shrug at 30%, 45%, 65%, and 80% of their 1RM hang power clean. Jump height, peak landing force, and potential energy of the system at jump-shrug apex were compared between loads using a series of 1-way repeated-measures ANOVAs. Statistical differences in jump height (P <.001), peak landing force (P =.012), and potential energy of the system (P <.001) existed; however, there were no statistically significant pairwise comparisons in peak landing force between loads (P >.05). The greatest magnitudes of jump height, peak landing force, and potential energy of the system at the apex of the jump shrug occurred at 30% 1RM hang power clean and decreased as the external load increased from 45% to 80% 1RM hang power clean. Relationships between peak landing force and potential energy of the system at jump-shrug apex indicate that the landing forces produced during the jump shrug may be due to the landing strategy used by the athletes, especially at lighter loads. Practitioners may prescribe heavier loads during the jump-shrug exercise without viewing landing force as a potential limitation.

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