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| 2. |
- Fumarco, Luca
(författare)
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Disability discrimination in the rental housing market : a field experiment on blind tenants
- 2015
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Although discrimination against disabled people has been investigated in the labor market, the housing market has received less attention in this regard. This paper focuses on the latter market and investigates whether blind tenants assisted by guide dogs are discriminated against in the rental housing market. The data are collected through a field experiment in which written applications were sent in response to online advertisements posted by different types of advertisers. I find statistically significant evidence that one type of online advertiser, that is, the apartment owner (i.e., a person who advertises and rents out his/her own apartment(s) on his/her own), discriminates against blind tenants, because of the presence of the guide dog, not because of the disability. According to the legislation, this behavior qualifies as illegal discrimination.
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| 3. |
- Hu, Sha, et al.
(författare)
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Spherical Large Intelligent Surfaces
- 2020
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Ingår i: 2020 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2020 - Proceedings. - 1520-6149. - 9781509066315 ; 2020-May, s. 8673-8677
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Konferensbidrag (refereegranskat)abstract
- As an emerging technology and evolution that goes beyond massive multi-input multi-output (MIMO), large intelligent surface (LIS) has gained much interest. LIS acts as an electromagnetic surface that can transmit, redirect, and receive radiating signals across its entire contiguous surface. It allows for unprecedented energy-focusing, data-transmission and terminal-positioning, and can fulfill the most grand visions for future communication systems. Earlier proposed LISs are in two-dimensional (2D), i.e., planar shapes. In this paper, we extend LISs to be three-dimensional (3D) and deployed as spherical surfaces. Compared to 2D LIS, a spherical LIS has advantages in wide coverage, simple positioning technique, and flexible deployment as reflecting surface.
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| 4. |
- Hu, Shichao, et al.
(författare)
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Synthesis and crystal structure of Fe6Ca2(SeO3)(9)Cl-4 - a porous oxohalide
- 2013
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Ingår i: Dalton Transactions. - : Royal Society of Chemistry (RSC). - 1477-9226 .- 1477-9234. ; 42:22, s. 7859-7862
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Tidskriftsartikel (refereegranskat)abstract
- A porous oxohalide, Fe6Ca2(SeO3)(9)Cl-4, has been synthesized by solid state reactions using concentrated HCl as the Cl-source. It crystallizes in the hexagonal space group P6(3)/m with unit cell parameters a = 12.118(2) angstrom, c = 12.703(4) angstrom, Z = 2. The crystal structure is an open framework having one-dimensional channels extending along [001] that the chlorine atoms and lone pairs on Se4+ are facing. The channels in this framework structure are unusually large compared to other oxohalide compounds and also accessible to guest molecules. Water vapor sorption measurements show an uptake of 9 wt% at 293 K.
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| 5. |
- Islar, Mine, et al.
(författare)
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“We are not in this to save the polar bears!” : the link between community renewable energy development and ecological citizenship
- 2016
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Ingår i: Innovation: The European Journal of Social Science Research. - : Informa UK Limited. - 1351-1610 .- 1469-8412. ; 29:3, s. 303-319
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Tidskriftsartikel (refereegranskat)abstract
- The transition from a fossil fuel-based energy system to a renewable one has emerged as a priority for many governments. This, in turn, has facilitated a rapid increase in renewable energy investments. However, this development raises important questions about the sustainability of energy governance when it comes to access and control of energy, public participation and transparency. In this article, decentralized renewable energy production is presented as one of the pathways towards more participation in sustainable energy development. Community renewable energy projects help to enable communities to act as citizens, rather than consumers. In this article, we aim to understand the interactions between community renewable energy transition and collective practices of citizenship. We investigate collective practices in energy development within the ecological citizenship framework by addressing the extent to which each community’s energy project displays the characteristics of ecological citizenship, in terms of how their collectivity is organized, articulated and shaped the future goals and vision. Based on the empirical data collected in Feldheim (Germany) and Samsø (Denmark), we find out that when collectivity is embedded in community renewable energy development, it resonates with the particularities of communitarian ecological citizenship that has a local focus rather than a political focus, and primarily prioritizes the cohesiveness and interests of the community (i.e. economic development) rather than the global commitment to sustainability discourses (i.e. climate change). This article also raises questions about the importance of intentionality in bringing about ecological outcomes of renewable energy transitions.
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| 6. |
- Ji, Xiaoyan, et al.
(författare)
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Simulation and energy optimization in a pulp and paper mill : Evaporation plant and digester
- 2011
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Ingår i: Third International Conference on Applied Energy. ; , s. 109-122
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Konferensbidrag (refereegranskat)abstract
- A mathematical process integration model of a pulp and paper mill in the Northern Sweden has been developed. The main modelling focus has been put on the two main steam consumers (the evaporation plant and the digester), for which detailed material and energy balances have been established. Operational data have been used to validate the simulation results. By implementing these submodels into the complete plant model, the influence of different operation parameters on the overall plant performance has been investigated. Furthermore, introductory studies with the main objective to minimize the plant energy cost have been carried out. The correlation and differences between economic and energy have been discussed
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| 7. |
- Ji, Xiaoyan, et al.
(författare)
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Simulation and energy optimization of a pulp and paper mill - Evaporation plant and digester
- 2012
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Ingår i: Applied Energy. - : Elsevier BV. - 0306-2619 .- 1872-9118. ; 97, s. 30-37
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Tidskriftsartikel (refereegranskat)abstract
- A detailed mathematical process integration model of a pulp and paper mill in the Northern Sweden has been developed. The main objective of this work has been set to describe the practical development of the model with particular emphasis on the development of the digester and evaporation plant sub-models. Actual plant measurements have been used to validate the model. By implementing the sub-models into the complete plant model, the influence of different operation parameters on the overall plant performance has been investigated. Furthermore, introductory studies with the main objective to minimize the plant energy cost have been carried out. © 2012 Elsevier Ltd.
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| 8. |
- Jin, Shao-Bo, et al.
(författare)
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CRM1 and Ran are present but a NES-CRM1-RanGTP complex is not required in Balbiani ring mRNP particles from the gene to the cytoplasm
- 2004
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Ingår i: Journal of Cell Science. - : The Company of Biologists. - 0021-9533 .- 1477-9137. ; 117, s. 1553-1566
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Tidskriftsartikel (refereegranskat)abstract
- Messenger RNA is formed from precursors known as pre-mRNA. Theseprecursors associate with proteins to form pre-mRNA-protein(pre-mRNP) complexes. Processing machines cap, splice and polyadenylatethe pre-mRNP and in this way build the mRNP. These processingmachines also affect the export of the mRNP complexes from thenucleus to the cytoplasm. Export to the cytoplasm takes placethrough a structure in the nuclear membrane called the nuclearpore complex (NPC). Export involves adapter proteins in themRNP and receptor proteins that bind to the adapter proteinsand to components of the NPC. We show that the export receptorchromosomal region maintenance protein 1 (CRM1), belonging toa family of proteins known as importin-ß-like proteins,binds to gene-specific Balbiani ring (BR) pre-mRNP while transcriptiontakes place. We also show that the GTPase known as Ran bindsto BR pre-mRNP, and that it binds mainly in the interchromatin.However, we also show using leptomycin B treatment that a NES-CRM1-RanGTPcomplex is not essential for export, even though both CRM1 andRan accompany the BR mRNP through the NPC. Our results thereforesuggest that several export receptors associate with BR mRNPand that these receptors have redundant functions in the nuclearexport of BR mRNP.
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| 9. |
- Liu, Felix
(författare)
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High Performance Computing for the Optimization of Radiation Therapy Treatment Plans
- 2024
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Radiation therapy is a clinical field in which computer simulations play a crucial role. Before patients undergo radiation therapy, an individual treatment plan for each patient needs to be created based on the specifics of their case (a process often referred to as treatment planning). The main aspect of this is setting the control parameters for the treatment machine so that the radioactive dose delivered to the patient is as concentrated to the tumor volume as possible. The inverse problem of determining such appropriate control parameters is typically formulated as an optimization problem, which, considering the complexity of modern treatment machines, requires computerized algorithms to solve accurately. Solving this optimization problem can be a key computational bottleneck in the treatment planning workflow. In many cases, finding a suitable treatment plan is a trial-and-error process, requiring multiple solutions of the optimization problems with different weights and parameters.This thesis proposes different methods to enable the use of high performance computing (HPC) hardware to accelerate the optimization process in radiation therapy. We deal with two main computational aspects of the optimization workflow, the calculation of dose, gradients and objective functions; as well as the optimization solver itself. For dose calculation during optimization, we propose a CUDA kernel for sparse matrix-vector products tuned to dose deposition matrices from proton therapy. For the evaluation of the objective function -- which is often constructed as a weighted sum -- we develop a method to distribute the calculation of the objective function and its gradient across computational nodes using message passing.For the optimization solver itself we first propose a task-based parallel implementation for Cholesky factorization of banded matrices. This can be an important kernel in interior point methods (IPM) for optimization, depending on the structure of the optimization constraints. The final two papers in this thesis deal with the adoption of iterative linear algebra in IPMs to enable GPU acceleration of the optimization solve. We develop an IPM using a doubly augmented formulation of the KKT linear system and Jacobi preconditioned conjugate gradient method, which we show can solve problems to acceptable accuracy as well as benefit substantially from GPU acceleration. Benchmarks against the commercial treatment planning system RayStation shows that our solver can improve performance by up to 4.4 times on some realistic cases.
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| 10. |
- Nicolis, Stamatios C., et al.
(författare)
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Dynamics of Collective Decisions in a Time-Dependent Environment
- 2014
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Ingår i: International Journal of Bifurcation and Chaos in Applied Sciences and Engineering. - 0218-1274. ; 24:8, s. 1440010-
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Tidskriftsartikel (refereegranskat)abstract
- The field of dynamical systems had been revolutionized by the seminal work of Leonid Shil'nikov. As a tribute to his genius we analyze in this paper the response of dynamical systems to systematic variations of a control parameter in time, using a normal form approach. Explicit expressions of the normal forms and of their parameter dependences are derived for a class of systems possessing multiple steady-states associated to collective choices between several options in group-living organisms, giving rise to bifurcations of the pitchfork and of the limit point type. Depending on the conditions, delays in the transitions between states, stabilization of metastable states, or on the contrary enhancement of the choice of the most rewarding option induced by the time dependence of the parameter are identified.
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