Events: Fysik events at Chalmers University of TechnologyFri, 20 May 2022 13:25:27 +0200 based products: examples of failure and success<p>Online</p><p>Welcome to a 2D-TECH webinar.  Simone Ligi, Graphene-XT will talk about Graphene based products: examples of failure and success​</p> solid oxide fuel cells and carbon dioxide electrolysis via developing catalyst, electrode structure and cell configuration<p>OOTO Café, café, Sven Hultins Plats 2, Johanneberg Science Park 2</p><p>​Dr Mengran Li will give his research presentation for Assistant Professor within the Energy Area of Advance. Welcome!​​​​</p><strong>​</strong><span style="background-color:initial"><strong>​<img src="/en/areas-of-advance/energy/calendar/PublishingImages/aaron.jpg" alt="Mengran Li" class="chalmersPosition-FloatRight" style="margin:5px;width:203px;height:249px" />WHO: </strong>Mengran Li</span><div><strong>​WHEN:</strong> 24 May, 09:30–10:20</div> <span style="background-color:initial"><strong>WHERE:</strong> Café Ooto, Room 4, Guldhuset, Johanneberg Science Park, Sven Hultins gata 1-2, Chalmers Campus Johanneberg.<br /></span><br /><strong>ABSTRACT:</strong><br /><span style="font-size:12pt;text-align:justify;background-color:initial">Electrochemical energy conversion is one of the promising routes to address the grand challenges in electricity generation and decarbonization. However, most electrochemical processes face critical challenges in improving energy efficiency, product selectivity, and system stability. In this talk, I will present my research on addressing these challenges for solid oxide fuel cells and CO</span><sub style="text-align:justify;background-color:initial">2</sub><span style="font-size:12pt;text-align:justify;background-color:initial"> electrolysis.</span><p class="MsoNormal" style="margin-bottom:0cm;text-align:justify;line-height:normal"><span lang="EN-GB" style="font-size:12pt">First, I will discuss my findings in developing perovskites as cathodes for solid oxide fuel cells operating at below 500 </span><span lang="EN-GB" style="font-size:12pt">°</span><span lang="EN-GB" style="font-size:12pt">C. Using a combined experimental and theoretical approach, we uncovered the key role of the dopants in determining the activity of the perovskite oxides by affecting their neighbouring active metal centres such as cobalt ions. Based on this finding, we show the possibility to predict the oxygen vacancies and activity of the perovskites via machine learning techniques. </span></p> <p class="MsoNormal" style="margin-bottom:0cm;text-align:justify;line-height:normal"><span lang="EN-GB" style="font-size:12pt">In the second topic, I will share my recent work in achieving selective CO<sub>2</sub> electrolysis via modulating the catalyst morphology and surface chemistry, optimising electrode structures and wettability, and tailoring the electrolyte chemistry. In addition, this talk will also show the importance of reactor design and process intensification to address the critical challenges faced by this field.</span></p> <span lang="EN-GB" style="text-align:justify;background-color:initial;font-size:12pt">Lastly, I will conclude with my future research directions and discuss potential synergy with research groups at the </span><span lang="EN-US" style="text-align:justify;background-color:initial;font-size:12pt">Chalmers University of Technology.</span><div><span lang="EN-US" style="text-align:justify;background-color:initial;font-size:12pt"><br /></span></div> <div><span lang="EN-US" style="text-align:justify;background-color:initial;font-size:12pt"><div style="font-size:14px;text-align:start"><span style="font-weight:700">Contact: </span><a href=""><span style="background-color:initial">T</span><span style="background-color:initial">omas Kåberger</span></a><span style="background-color:initial">​, Director, Energy Area of Advance. </span></div> <div style="font-size:14px;text-align:start"><a href="">Sonia Yeh​</a>, Co-Director, Energy Area of Advance. ​</div></span></div> Al-Dbissi, Nuclear Engineering<p>Raven and the Fox, conference room, Fysikgränd 3, Forskarhuset Fysik</p><p>​Title: Developments toward a novel methodology for spent nuclear fuel verification</p>​<div><strong>Abstract</strong>: <span style="background-color:initial">One of the tasks in nuclear safeguards is to regularly inspect spent nuclear fuel discharged from nuclear power reactors and verify the integrity of it, so that illegal removal and diversion of radioactive material can be promptly discovered. In the current project, which is a collaboration between Chalmers University of Technology and SCK CEN, a novel methodology for non-intrusive inspection of spent nuclear fuel is under development. The methodology consists of two main steps: 1) neutron flux and its gradient are measured inside spent nuclear fuel assemblies using small neutron detectors; and 2) the measurements are processed using an Artificial Neural Network (ANN) algorithm to identify the number and location of possible fuel pins that have been removed from the fuel assemblies and/or replaced with dummies. The use of small neutron detectors simplifies the inspection procedure since the fuel assemblies are not moved from their storage position. In addition, the neutron flux gradient measurements and its processing with the ANN algorithm have the potential for more detailed results. Different aspects have been investigated for the development of the methodology.</span><div>For the first step of the methodology, the concept of a new neutron detector has been studied via Monte Carlo simulations and it relies on the use of optical fiber-mounted neutron scintillators. The outcome of the computational study shows that the selected detector design is a viable option since it has a suitable size to be introduced inside a fuel assembly and can measure neutron flux gradients. Then, experimental work has been carried out to test and characterize two optical fiber-based neutron scintillators that can be used to build the detector, with respect to detection of thermal neutrons and sensitivity to gamma radiation.</div> <div>For the second step of the methodology, a machine learning algorithm based on ANN is studied. At this initial stage, a simpler problem has been considered, i.e., an ANN has been prepared, trained and tested using a dataset of synthetic neutron flux measurements for the classification of PWR nuclear fuel assemblies according to the total amount of missing fuel, without including neutron flux gradient measurements and without localizing the anomalies. From the comparison with other machine learning methods such as decision trees and k-nearest neighbors, the ANN shows promising performance.</div> <div><br /></div></div> for Sustainable Energy Production<p>OOTO Café, café, Sven Hultins Plats 2, Johanneberg Science Park 2</p><p>​Dr Mathilde Luneau will give his research presentation for Assistant Professor within the Energy Area of Advance. Welcome!​​​</p><strong>​</strong><span style="background-color:initial"><strong>​<img src="/en/areas-of-advance/energy/calendar/PublishingImages/Mathilde%20Luneau.jpg" alt="Mathilde Luneau" class="chalmersPosition-FloatRight" style="margin:5px" />WHO: </strong>Mathilde Luneau</span><div><strong>​WHEN: </strong>24 May, 10:30–11:20</div> <div><strong>WHERE:</strong> Café Ooto, Room 4, Guldhuset, Johanneberg Science Park, Sven Hultins gata 1-2, Chalmers Campus Johanneberg.</div> <div><br /></div> <div><strong style="background-color:initial">ABSTRACT:</strong><br /></div> <div>To address today’s environmental challenges, the production of energy and chemicals must rapidly change. The chemical industry currently relies on catalysts, materials that speed up reactions, in 90% of its processes, making catalysis one the most prominent engines of our society. <br /><br />Catalysis will play a pivotal role in the transition from our fossil fuel-based society to a more sustainable and renewable society. Therefore, the design of new catalysts is crucial to the development of emerging chemical and electrochemical processes for sustainable energy production and storage. Developing novel catalytic systems for such a broad range of emerging applications, while facing metal scarcity issues, is challenging.<br />The key to designing new catalysts is understanding the complexity and dynamic nature of the catalyst surface – where the reaction takes place - during reaction. This challenge can be addressed by taking a multidisciplinary approach involving the design and testing of novel catalytic materials, and by using and developing cutting-edge new characterization techniques to gain fundamental understanding of the working catalyst. Applied to industry-relevant thermocatalytic and electrocatalytic reactions, this integrated process will help create a sustainable future through catalysis. <br /><br /></div> <div><div><span style="font-weight:700">Contact: </span><a href=""><span style="background-color:initial">T</span><span style="background-color:initial">omas Kåberger</span></a><span style="background-color:initial">​, Director, Energy Area of Advance. </span></div> <div><a href="">Sonia Yeh​</a>, Co-Director, Energy Area of Advance. </div></div> May, MPPHS Physics<p>PJ, seminar room, Kemigården 1, Fysik Origo</p><p>​Title of master thesis: Bayesian History Matching of Chiral Effective Field Theory in the Two-Nucleon Sector Follow the presentation online Password:902278 ​</p><strong>​Abstract:</strong><div><div>The accurate calculation of nucleon-nucleon scattering observables from first principles is an ongoing challenge within nuclear physics. Working within the framework of chiral effective field theory provides a method for calculating such observables. This is achieved through the construction of an effective Lagrangian that maintains the symmetries of quantum chromodynamics (QCD). In this thesis, truncation of the Lagrangian is performed using a modified Weinberg power counting, introducing a set of unknown low-energy constants at each order in the chiral expansion.</div> <div><br /></div> <div>Bayesian history matching is used to explore the leading order description of the nucleon-nucleon system. This is achieved through the iterative reduction of the four-dimensional parameter space, taking a Bayes linear approach. The history matching implementation is validated on the nuclear liquid drop model. Several novel methods of sampling are introduced within the implementation with the purpose of capturing correlations between parameters; The generation of ellipsoidal distributed samples is shown to be the most successful. History matching is subsequently applied to the proton-neutron scattering problem. We identify the subset of parameter space containing all low-energy constants that produce model outputs consistent with experimental two-nucleon scattering data, accounting for relevant sources of uncertainty. Non-implausible parameter volumes are obtained across a range of momentum regulator cutoffs. Finally, non-implausible samples are used to predict the deuteron binding energy. Results indicate that the inclusion of this observable within the history match could further constrain the volumes.</div> <div><br /></div> <div>The analysis performed in this thesis was successful in producing sets of non-implausible samples. Such sets can be subsequently used as a starting point for a full Bayesian analysis, with the aim of producing posterior probability distributions. For example, the samples can be used to initialise walkers within the Markov Chain Monte Carlo method.</div></div> Webinar – Lipid nanoparticles for mRNA delivery<p>Online Zoom</p><p>On May 30, it´s time for our online Tandem Webinar – The role of supramolecular lipid self assembly and protein corona formation for functional mRNA delivery to cells. Two hot topics will be covered by Elin Esbjörner and Fredrik Höök​</p>​<div>Place: Online. Platform Zoom. Last day to register 25 May.<div><br /><div><span style="background-color:initial"><b><span></span><a href=""><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/icgen.gif" alt="" />​Register to the webinar​</a></b><br /></span><div><div style="font-family:lato, helvetica, arial;font-weight:bold"><br /></div> <div class="copy-action-wrapper" style="height:28px"><br /></div></div> <div><span style="background-color:initial;font-weight:700"><img src="/SiteCollectionImages/Institutioner/F/170x170px/Profilbilder_kollegiet_2020/170Fredrik%20Hook-201130.jpg" alt="Fredrik Höök" class="chalmersPosition-FloatRight" style="margin:5px" />Program:<br /></span><ul><li>12 PM, The webinar starts. Moderator: Maria Abrahamsson, Director Chalmers Area of Advance Materials Science</li> <li><a href="/en/staff/Pages/Fredrik-Höök.aspx">Fredrik Höök</a>, <em>Professor, Nano and Biophysics, Department of Physics, Chalmers University of Technology</em>.</li> <li><span style="background-color:initial"><a href="/en/staff/Pages/Elin-Esbjörner-Winters.aspx">Elin Esbjörner</a>, </span><i>Associate Professor, Biology and Biological Engineering, Chemical Biology, Chalmers University of Technology<br /><br /></i></li></ul> <span style="background-color:initial"><strong>​</strong></span><span style="background-color:initial"><strong>​Abstract:</strong><br />Lipid nanoparticles (LNPs) serve as carriers for mRNA delivery in a new generation of vaccines, but several challenges remain before this approach can offer broad clinical translation of RNA therapeutics. </span></div> <div><span style="background-color:initial"><img src="/SiteCollectionImages/Institutioner/KB/Kemi_och_Biokemi/Fysikalisk_kemi/eline-Elin-Esbjorner-Winters.jpg" alt="Elin Esbjörner Winters" class="chalmersPosition-FloatRight" style="margin:5px;width:166px;height:213px" />Fredrik Höök and Elin Esbjörner Winters will present the interdisciplinary approach established to address some of these challenges within the SSF funded industrial research center FoRmulaEx. </span></div> <div><span style="background-color:initial">Exa</span><span style="background-color:initial">mples will include the development of advanced optical microscopy approaches to characterize LNPs with single nanoparticle resolution, new means to label the mRNA cargo as well as live-cell imaging approaches for visualization of endosomal LNP processing and functional mRNA delivery. </span><br /></div> <div><span style="background-color:initial">Par</span><span style="background-color:initial">ticular emphasis will be put on the role of protein corona formation on the time-dependent maturation steps that critically unlock cellular LNP uptake and mRNA delivery.​</span><br /></div> <div><span style="background-color:initial"><br /></span></div> <div><span></span><span style="background-color:initial"><strong>Read more:</strong><br /></span><a href="/en/centres/FoRmulaEx/Pages/default.aspx"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/ichtm.gif" alt="" />FoRmulaEx</a><span style="background-color:initial"><br /></span></div> ​</div></div></div> [about Nanoscience] Superconductors, microparticles, quantum technology<p>Kollektorn MC2, and on Zoom</p><p>​​​Welcome to a seminar in the series SmallTalks [about Nanoscience] arranged by the Excellence Initiative Nano​. Martí Gutierrez Latorre, doctoral student at the department of Microtechnology and Nanoscience will talk about superconductors, microparticles, quantum technology. The seminar will be held both live and on Zoom  Join from PC, Mac, Linux, iOS or Android: ​</p>​<span style="background-color:initial">​<img src="/SiteCollectionImages/Areas%20of%20Advance/Nano/SmallTalk%20about%20Nanoscience/Decisiontree_EI_NanoSeminar2021_SC%203.jpg" class="chalmersPosition-FloatRight" alt="" style="margin:5px;width:200px;height:275px" /></span><span style="background-color:initial">In c</span><span style="background-color:initial">ase you are not sure yet, whether you want to attend or not, we have prepared a decision tree that might help you! </span><div><span style="background-color:initial">Click to get a larger picture.</span></div> <span style="background-color:initial"> </span> Professors Nano 2022 - research presentations<p>Kollektorn, lecture room, Kemivägen 9, MC2-huset</p><p>​The candidates will give their research presentations for Assistant Professor within the Excellence Initiative Nano. Welcome to listen to the presentations!</p>​<span style="background-color:initial">08.30 – 09.20</span><span style="background-color:initial;white-space:pre"> </span><span style="background-color:initial">Angela Grommet</span><div>09.30 – 10.20<span style="white-space:pre"> </span>Nils Johan Engelsen</div> <div>10.30 – 11.20<span style="white-space:pre"> </span>Dmitry Baranov</div> <div>11.30 – 12.20<span style="white-space:pre"> </span>Petr Stepanov</div>öteborg Mesoscopic Lecture: In Search for the Next Magic Stone<p>Kollektorn, lecture room, Kemivägen 9, MC2-huset</p><p>Welcome to Göteborg Mesoscopic Lecture, Summer Lecture 2022 with Zhi-Xun Shen, Depts Physics and Applied Physics, Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory​</p>Coffee will be served from 15.00​​<div><strong>​</strong><div><strong>Abstract:</strong><div><div>Materials demarcate periods of human civilization. The current period can be argued as defined by silicon, the magic stone that transformed the way we live. In this talk, I will discuss how the concept of quantum, and the 1st wave of quantum revolution led to the rise of silicon, the integrated circuit, Silicon Valley and the information age. I will then discuss the opportunities and challenges beyond silicon, and theoretical ideas and experimental tools needed to enable the next wave of quantum, in search for the next magic stone. </div></div> <div><br /></div> <div><span style="font-weight:700"><img src="/SiteCollectionImages/Institutioner/MC2/Föreläsningar/zhi-xun-shen.jpg" class="chalmersPosition-FloatRight" alt="" style="margin:5px" />Bio:</span><div><span style="background-color:initial">Dr. Shen is a member of US Ntl Ac Sci, Am Ac Arts &amp; Sci, Chinese Ac Sci. His primary interest is novel quantum phenomena in materials. His work has been recognized  by the E.O. Lawrence Award, the Oliver E. Buckley Prize, the H. Kamerlingh Onnes Prize, and the Einstein Professorship Award of CAS. He has been Chief Scientist of SLAC and director of institutes of material and energy and of the Geballe Laboratory at Stanford University. He has mentored close to one hundred graduate students and post-docs and he is a co-inventor of several patents. </span></div></div> <div><br /></div></div></div> Phase Diagram of Cuprate Superconductors – a Balancing Act<p>Kollektorn, lecture room, Kemivägen 9, MC2-huset</p><p>Wel​come to a seminar with Zhi-Xun Shen, Depts Physics and Applied Physics, Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory ​</p><strong>​Abstract:</strong><div><div>High-temperature superconductivity in copper-based materials, with critical temperature well above what was anticipated by the BCS theory, remains a major unsolved physics problem more than 30 years after its discovery. The problem is fascinating because it is simultaneously simple - being a single band and ½ spin system, yet extremely rich - boasting d-wave superconductivity, pseudogap, spin and charge orders, and strange metal phenomenology. For this reason, cuprates emerge as the most important model system for correlated electrons – stimulating conversations on the physics of the Hubbard model, quantum critical points, Planckian metals and other topics. </div> <div>At the heart of this challenge is the complex electronic phase diagram consisting of intertwined states with unusual properties. Angle-resolved photoemission spectroscopy has emerged as the leading experimental tool to understand the electronic structure of these states and their relationships [1,2]. In this talk, I will describe our results on band structures and Fermi surfaces [3,4]; the d-wave superconducting state [5,6]; the birth of a metal from a Mott insulator [7-11]; the two energy scales of the pseudogap [8,9,12-13]; the temperature, doping and symmetry properties of the low energy pseudogap and its competition with superconductivity [14-18]; the missing quasiparticle and propensity to order [19-21], the interplay of electron-electron and electron-phonon interactions and the enhanced superconductivity [21-24], the incoherent metal sharply bounded by a critical doping [25-26], and the ubiquitous superconducting phase fluctuations [27,28]. The rich phenomenology suggests that a delicate balance between local Coulomb interaction and electron-phonon interaction holds the key to emerging physics in cuprates – unconventional superconductivity, anomalous metal, novel insulator, and intertwined orders.</div></div> <div><br /></div> <div><div>[1] A. Damascelli, Z. Hussain, and Z.-X. Shen, RMP, 75, 473 (2003)     <span style="white-space:pre"> </span><br />[2] J. Sobota, Y.He and Z.-X. Shen, RMP, 93, 025006 (2021)<br /><span style="background-color:initial">[3] D.S. Dessau et al., Phys. Rev. Lett. 66, 2160 (1991)<br /></span><span style="background-color:initial">[4] P. Bogdanov et al., Phys. Rev. Lett. 89, 167002 (2002)<br />[5] Z.-X. Shen et al., Phys. Rev. Lett. 70, 1553 (1993)<br /></span><span style="background-color:initial">[6] M. Hashimoto et al., Nature Physics 10, 483 (2014)<br />[7] B.O. Wells et al., Phys. Rev. Lett. 74, 964 (1995)<br /></span><span style="background-color:initial">[8] D.M. King et al., J. of Phys. &amp; Chem of Solids 56, 1865 (1995)<br />[9] Z.-X. Shen et al., Science 267, 343 (1995)<span style="white-space:pre"><br /></span></span><span style="background-color:initial">[10] N.P. Armitage et al., Phys. Rev. Lett. 87, 147003 (2001) <br />[11] J. He et al. PNAS 116, 9, 3449-3453 (Feb. 2019)<span style="white-space:pre"><br /></span></span><span style="background-color:initial">[12] D.S. Marshall et al., Phy. Rev. Lett. 76, 484 (1996)<br /></span><span style="background-color:initial;white-space:pre"></span></div> <div>[13] A.G. Loeser et al., Science 273, 325 (1996)<span style="white-space:pre"><br /></span>[14] K. Tanaka et al., Science 314, 1910 (2006)<br />[15] W.S. Lee et al., Nature 450, 81 (2007)<span style="white-space:pre"> </span><br />[16] M. Hashimoto et al., Nature Physics 6, 414-418 (2010) <br />[17] R.H. He et al., Science 331, 1579 (2011)<span style="white-space:pre"><br /></span>[18] M. Hashimoto et al., Nature Materials 14, 1 (2015)<br />[19] D.L. Feng et al., Science 289, 277 (2000)<span style="white-space:pre"><br /></span>[20] K.M. Shen et al., Phys. Rev. Lett., 93, 267002 (2004)<br />[21] KM Shen et al., Science 307, 901 (2005)<span style="white-space:pre"><br /></span>[22] A. Lanzara et al., Nature 412, 510 (2001)<br />[23] T. Cuk et al., Phys. Rev. Lett., 93, 117003 (2004)<span style="white-space:pre"><br /></span>[24] Yu He et al., Science, 362, 62 (Oct. 2018)      </div> <div>[25] I.M. Vishik et al., PNAS 109/45, 18332-18337 (2012)<br />[26] S.D. Chen et al., Science 366, 1099 (2019)</div> <div>[27] Y. He et al., Phys. Rev. X, 031068 (2021)<br />[28] S.D. Chen et al., Nature 601, 562 (2022)</div> <div><br /></div></div> <div><br /></div>án-Dewambrechies-Fernández-220603.aspxán Dewambrechies Fernández, MPPHS Physics<p>PJ, seminar room, Kemigården 1, Fysik Origo</p><p>​​Title of Master thesis: Spectroscopic Characterization of Edges in Transition Metal Dichalcogenide Metastructures Follow the presentation online Password: 581711</p><strong>​</strong><span style="background-color:initial"><strong>Abstract:  </strong></span><div>Two-dimensional materials have proven to show a very broad spectrum of physical phenomena for the past decades, offering a very important scientific playground, both under an experimental and theoretical point of view. While the family of Transition Metal Dichalcogenides (TMDCs) has overcome most of the problems that prevented graphene to consolidate as a reliable material for a scalable integrated circuit implementation, they still face their own challenges regarding device-to-device variability, and requirements for industry-scalable dimensions. </div> <div>The next step in the understanding of two-dimensional materials is the study of the physics taking place at the edges, which can be very different from its bulk counterpart, these differences ultimately coming from the symmetry breaking in the crystal structure and its consequences on the electronic properties. In this context, this thesis is focused on the characterization of these one-dimensional defects that can be produced in a new kind of metastructures taking place on different TMDC multilayers, with very high-quality in their crystal symmetry and optoelectronic properties. The project will start with production of these physical systems, followed by their characterization via optical and mechanical means, in particular Raman spectroscopy, Second Harmonic Generation (SHG), Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM).  </div> <div>This complete vision coming from different corners of the characterization will enlighten the growth process of these metastructures, testing their reliability as a system where the understanding of edge physics can be promoted and developed. </div> Rizki Pahlevi, MPCAS<p>Nexus 4030, meeting room, Kemigården 1, Fysik Origo</p><p>​T​itle of master thesis: Deep Learning for Optical Tweezers: DeepCalib Implementation for Brownian Motion with Delayed Feedback</p><strong>Abs​tract:</strong><div><div>Brownian motion with delayed feedback theoretically studied to take control of Brownian particle movement’s direction. One can use optical tweezers to implement delayed feedback. Calibrating optical tweezers with delay implemented is not an easy job. In this study, Deep learning technique using Long Short Term Memory(LSTM) layer as main composition of the model to calibrate the trap stiffness andto measure the delayed feedback employed, using the trapped particle trajectory asan input. We demonstrate that this approach is outperforming variance methods inorder to calibrate stiffness, also outperforming approximation method to measure the delay in harmonic trap case.</div></div> <div><br /></div> Karlsson, MPPHS fysik<p>Physics Soliden, university building, Origovägen 6B, Campus Johanneberg, Floor 3, von Bahr</p><p>​​Title of master thesis: Towards more efficient solar cells: the effect of dynamical disorder on the electronic structure of halide double perovskites</p><strong>​</strong><span style="background-color:initial"><strong>Abstract:</strong></span><div>Recently, simple perovskites have attracted great attention as the energy-absorbing material in solar cells. In computational and experimental studies they have shown several desirable properties but also challenges, such as instabilities and toxicity due to the presence of lead. As a solution to the problems connected to the simple perovskites, the double perovskites were suggested as a suitable material in the solar cells of tomorrow. In order to use double perovskites in an application it needs to be thoroughly understood. Within this thesis the octahedral tilting and the band gap of double perovskites have been studied, which is a step towards finding a material that is stable and exhibit the optimal band gap to absorb solar energy. It turns out that the octahedral tilting is not as prominent in all double perovskites as in the simple ones. The statement that the octahedral tilting is due to the presence of lone-pair electrons is considered and it agrees with observations - lone-pair electrons induce octahedral tilting. The effect of octahedral tilting on the band gap of the double perovskites is studied as well and it is concluded that the band gap increases with the tilting. As the global warming increases rapidly it is important to find green solutions and as solar cells are renewable and emission-free they are good candidates for further developement.</div> Bergström och Peter Halldestam, MPPHS Physics<p>PJ, seminar room, Kemigården 1, Fysik Origo</p><p>​Title of Master thesis: Optimization of tokamak disruption scenarios: avoidance of runaway electrons and excessive wall loads Follow the presentation online Password: optimize</p><strong>​Abstract:</strong><div><div>Research in the field of fusion science has been propelled by its potential to alleviate humanity's reliance on fossil fuels. </div> <div>One of today's most promising approaches to generating thermonuclear fusion energy uses magnetic confinement of hydrogen fuel in the plasma state. The tokamak concept, which has achieved the best fusion performance so far, is used in the two devices (ITER and SPARC) currently being constructed -- they aim to achieve a positive energy balance, thereby demonstrating the scientific feasibility of magnetic confinement fusion energy. </div> <div><br /></div> <div>A major open issue threatening the success of these tokamaks is plasma disruption. In these off-normal events the plasma loses most of its thermal energy on a millisecond timescale, exposing the device to excessive mechanical stress and heat loads. In addition, in the high-current devices currently under construction, one of the most important related problems is posed by currents carried by electrons accelerated to relativistic energies, called runaway electrons. If these were to strike the inner wall unmitigated, it may cause potentially irreversible damage to the device. The methods proposed to mitigate these dangerous effects of disruptions, such as massive material injection, are characterized by a large number of parameters, such as when to inject material, in which form and composition. This poses an optimization problem which involves a potentially high dimensional parameter space and a large number of disruption simulations. </div> <div><br /></div> <div>In this work, we have developed an optimization framework which we apply to numerical disruption simulations of plasmas representative of ITER, aiming to find initial conditions for which large runaway beams and excessive wall loads can be avoided. We assess the performance of mitigation when inducing the disruption by massive material injection of neon and deuterium gas. The optimization metric takes into account the maximum runaway current, the transported fraction of the heat loss -- affecting heat loads -- and the temporal evolution of the ohmic plasma current -- determining the forces acting on the device. </div></div>ée-Berger-220610.aspxée Berger, MPPHS Physics<p>PJ, seminar room, Kemigården 1, Fysik Origo</p><p>​Title of Master thesis: Runaway dynamics in reactor scale spherical tokamak disruptions Follow the presentation online Password: step</p><strong>​</strong><span style="background-color:initial"><strong>Abstract: </strong></span><div>One of the most promising concepts to achieve commercial fusion power, to date, is a toroidal magnetic confinement system centered around a tokamak. To aid the development, compact spherical tokamaks have long been proposed as component testing facilities. There is also an effort to design and construct spherical tokamaks suitable for energy production, with an example being the STEP program in the UK. One of the remaining obstacles for all reactor-scale tokamaks is so-called runaway electrons -- electrons accelerated to relativistic speeds. These can be generated during disruptions, which are off-normal events where the confinement of the plasma is rapidly lost. As runaway electrons can severely damage the machine walls, their production and mitigation has been extensively studied for conventional tokamaks. However, due to the disruption dynamics typically being different in spherical tokamaks, the existing results cannot directly be transferred to these more compact devices. Therefore, runaway dynamics in reactor-scale spherical tokamaks is investigated in this work, and we study both the severity of runaway generation during unmitigated disruptions, as well as the effect that typical mitigation schemes based on massive material injection have on runaway production. The study is conducted using the numerical framework DREAM (Disruption and Runaway Electron Avoidance Model) and we find that, in many cases, mitigation strategies are necessary if the runaway current is to be prevented from reaching multi-megaampere levels. Our results indicate that with a suitably chosen deuterium-neon mixture for mitigation, it is possible to achieve a tolerable runaway current and ohmic current evolution. With such parameters, however, the majority of the thermal energy loss happens through radial transport rather than radiation, which poses a risk of unacceptable localized heat loads.</div> Papadopoulos, Physics<p>PJ, seminar room, Kemigården 1, Fysik Origo</p><p>​Title: Correlation effects in ionic perovskite crystals</p><div><strong><br /></strong></div> <strong>Ab​stract</strong>: Rensmo, MPPHS Physics<p>PJ, seminar room, Kemigården 1, Fysik Origo</p><p>​Title of Master thesis: Characterization of HDPE using small and wide angle scattering</p><strong>Abstract</strong><span><strong>:</strong></span><div></div> <div>The importance of polymers in materials science can not be underestimated. Polymers are widely used within everything from clothing and  electronics to packages and paint. Tetra Pak uses the polymer high-density polyethylene, or HDPE, for their packaging solutions. The plastic material HDPE has the advantageous properties of being moldable and sturdy. To build understanding of what structures gives rise to these properties it is important to characterize the material. If the structure is known, it is perhaps possible to manufacture a similar material, in the future, that is not made from oil. This work focuses on the characterization of the material. The structures of HDPE are investigated with small and wide angle scattering.</div> <div><br /></div> Engineering Community Building Day<p>Hotel Riverton, Stora Badhusgatan 26, Göteborg</p><p>Take the opportunity to meet and learn to know your Chalmers colleagues within Health research!​ ​</p><div><div><strong>Weclome to the Health Engineering Area of Advance's Community Building Day! </strong></div> <div><strong><br /></strong></div> <div><strong>When: Wednesday 15 June, 09:00-16:00, followed by mingle<br /><br /></strong></div> <div><strong>Where: </strong><span style="background-color:initial"><b>Hotel Riverton, Stora Badhusgatan 26, Gothenburg ​</b></span></div> <div><strong><br /></strong></div> <div><strong>PROGRAM</strong></div> <div><b></b><span></span><div><br /></div> <div><b>9.00 Welcome </b></div> <div><b><br /></b></div> <div><b>9.05 What can Health Engineering Area of Advance do for Chalmers and for you?</b></div> <div>Ann-Sofie Cans, Martin Fagerström, Bo Norrman and profile leaders</div> <div><b><br /></b></div> <div><b>9.25 Strengthening the battle against antibiotic resistance</b></div> <div>Michaela Wentzel, BIO </div> <div><b><br /></b></div> <div><b>9.45 </b><span style="background-color:initial"><b>FoRmulaEx: Novel ways to study the delivery of RNA-based therapeutics</b></span><span style="background-color:initial">​</span></div> <div>Marcus Wilhemsson, K </div> <div><b><br /></b></div> <div><b>10.05 Center for Bionics and Pain Research</b></div> <div>Emily Pettersen, research coordinator @ CBPR </div> <div><b><br /></b></div> <div><b>10.25 Break </b></div> <div><b><br /></b></div> <div><b>10.50 When healthcare moves home</b></div> <div>Andreas Hellström, TME </div> <div><b><br /></b></div> <div><b>11.10 Disease Prevention through Precision Nutrition</b></div> <div>Rikard Landberg, BIO </div> <div><b><br /></b></div> <div><b>11.30 AI &amp; Health</b></div> <div>Fredrik Johansson, CSE </div> <div><b><br /></b></div> <div><b>12.00 Lunch </b></div> <div><b><br /></b></div> <div><b>13.00 GoCo Health Innovation City – what´s happening</b></div> <div>External speaker from GoCo </div> <div><b><br /></b></div> <div><b>13:20 Mingel stations</b></div> <div>Predefined topics, meet representatives for initiatives and centers, meet the AoA leadership, ask about Initiative funding,  etc. </div> <div><b><br /></b></div> <div><b>~16:00 Summary of the day </b></div> <div><b><br /></b></div> <div><b>Mingel with food and drinks</b></div></div> <div><br /></div></div> <div>​</div> <div><a href="" target="_blank"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/icgen.gif" alt="" />​REGISTER HERE! ​</a><div><br /></div> <div>Deadline for registration: Wednesday 25 May.</div> <div><br /></div> <div><span style="font-weight:700">Please note that this an internal event for Chalmers researchers only​</span><br /></div> <strong></strong></div> <div><br /></div> seminar with Raychelle Burks<p>Kunskapstrappan, meeting point, Sven Hultins Gata 6, Samhällsbyggnad I-II</p><p>Genie welcomes you to a equality/diversity seminar with Raychelle Burks - movie star, inclusiveness in STEM advocate, analytical chemist and Genie visiting faculty (at the Department of Chemistry and Chemical Engineering/Lars Öhrström) ​​</p>​​<img src="/SiteCollectionImages/Om%20Chalmers/Genie/Rachelle%20Burks.jpg" class="chalmersPosition-FloatLeft" alt="picture of rachelle burks" style="margin:5px;width:220px;height:275px" /><span style="background-color:initial"><strong>Raychelle Burks</strong>, Assoc Professor, Department of Chemistry, American University in Washington DC. </span><div>After working in a crime lab, Dr. Burks returned to academia, teaching, and forensic science research. Dr. Burks is a popular science communicator, appearing on TV, in podcasts, at large genre cons such as DragonCon and GeekGirlCon. She is a member of a number of local, national, and international committees, task forces, and projects focused on social justice and STEM. Raychelle is known to most of Chalmers from her attendance in the movie Picture a scientist, and is now visiting Chalmers Chemistry dept, as a Genie visiting faculty. Raychelle will speak about her engagement in equity, diversity, and inclusion to improving our workplaces. She hope to spend her time at Chalmers working on research and supporting more equitable work environment. </div> <div><br /></div> <div>Please register before 13 June at <a href="">​</a> to make sure there is a cup of coffee and cake for you. </div> <div><br /></div> Björn, Materials Science<p>PJ, seminar room, Kemigården 1, Fysik Origo</p><p>Ti​tle: Characterization of injection molded polymers: from conventional to wood-based thermoplastics</p>​<div><strong>Abstract</strong>: </div> Nielsen, Physics<p>PJ, seminar room, Kemigården 1, Fysik Origo</p><p>Title​: Theoretical and computational advances in small-angle x-ray scattering tensor tomography</p>​<div><strong>Abstract</strong>: </div> Nano Community Building 2022<p>Varbergs Kusthotell</p><p>​The annual Community Building activity will take place 22-24 August at Varbergs Kusthotell.Join us, present your work and get the best cross-disciplinary Nano-feedback and inspiration possible at Chalmers! The community building activity includes a broad scientific programme with lectures, a poster exhibition, and discussions in combination with team building and networking.  ​</p>​<span style="background-color:initial">The event is open to Chalmers employees and invited guests only. </span><span></span><span></span><div>It is free of charge, but all participants need to register. </div> <div><a href="/en/research/strong/nano/events/cb22/Pages/default.aspx"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/ichtm.gif" alt="" />Read more and register</a></div> <div><br /></div> <div></div> years of Sports & Technology<p>RunAn Chalmers Kårhus</p><p>​SAVE THE DATE: 6-7 September Sports &amp; Technology at Chalmers is celebrating its 10-year anniversary.Materials, Digitalization, Biomechanics and Fluid Dynamics - and applied to sports such as cycling, equestrian sports, floorball, sailing, skiing and swimming.</p><strong>​</strong><img src="/SiteCollectionImages/Centrum/Sports%20and%20Technology/General/Chalmers_Sport_o_Teknologi_ordbild_en.png" alt="Sport Technology" class="chalmersPosition-FloatLeft" style="margin:5px;width:155px;height:128px" /><span style="font-size:12pt;background-color:initial"><strong>Chalmers Sports &amp; Technology</strong> was initiated in 2012 as a response to the identified need for more in-depth engineering research applied in sports. Since then, we have conducted sports-related education, research and innovation together with more than 150 external stakeholders, including many companies, sports associations and clubs, and other public organizations.<br /><br /><img src="/SiteCollectionImages/20210701-20211231/hästhopp_S8A3210-5-4.jpg" alt="jumping" class="chalmersPosition-FloatLeft" style="margin:5px;width:154px;height:139px" /><strong>Several projects</strong> combining cutting edge research with challenges presented by the sport sector (athletes, coaches, sports associations and companies) have resulted in internationally recognized innovations.</span><div><span style="background-color:initial;font-size:12pt">Today Chalmers is also one of the National Sports Universities in Sweden where elite athletes can combine their sports with studies. </span><br /></div> <div><div><span style="font-size:16px"><br /></span></div> <div><span style="font-size:16px"><br /></span><span style="font-size:12pt;background-color:initial"></span><p class="MsoNormal" style="margin-bottom:15pt;line-height:16.5pt"></p> <p class="MsoNormal" style="margin-bottom:15pt;line-height:16.5pt"><span><span lang="EN-US" style="font-size:12pt"><img src="/en/education/PublishingImages/Sportteknologi.png" alt="Sport Technology" class="chalmersPosition-FloatLeft" style="margin:5px;width:150px;height:193px" /><strong>During the 10-year anniversary</strong> symposium you will have the opportunity to take part of</span></span><span><span style="font-size:12pt"> </span>inspiring seminars and workshops on ”Sports and Sustainability, Data driven sports research, Innovation in sports and Education in sports &amp; technology”. <br />Together with invited international speakers we will look into what can we learn from the past to create the future of Sports &amp; Technology at Chalmers. <br /><br /><strong>The details program will be available in June.​</strong></span></p> <strong> </strong><p class="MsoNormal" style="margin-bottom:15pt;line-height:16.5pt"><span><strong><br /></strong></span></p> <p class="MsoNormal" style="margin-bottom:15pt;line-height:16.5pt"><span><strong>Read more:</strong><br /></span><a href="/en/centres/sportstechnology/Pages/default.aspx"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/ichtm.gif" alt="" /><span style="background-color:initial">C</span><span style="background-color:initial">halmers Sports &amp; Technology</span></a><br /><span></span><a href="" style="outline:0px;font-weight:300"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/icgen.gif" alt="" /><strong></strong></a><br /></p> ​</div></div> for Tomorrow 2022: Materials Science for Sustainability<p>Chalmers Conferens Centre, RunAn, Chalmers Campus Johanneberg, Gothenburg.</p><p>​SAVE THE DATE: The topic of the 2022 Materials for Tomorrow will be Materials Science for Sustainability and cover all aspects of the Wallenberg Initiative Material Science for Sustainability, WISE. The event will take place at Chalmers Conference Centre, RunAn, in Gothenburg on 24-25 November with several internationally recognized speakers.</p><strong>​</strong><span style="background-color:initial"><strong>The Knut and Alice Wallenberg Foundation</strong> is investing SEK 3 billion in a new research program, the Wallenberg Initiative Material Science for Sustainability (WISE). The aim of the program is to create the conditions for a sustainable society by researching next generation of ecofriendly materials and manufacturing processes. This will also facilitate better technology for energy systems of the future, and to combat pollution and toxic emissions.<br /><br /><strong>More:</strong><br /></span><div><a href=""><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/icgen.gif" alt="" /><span style="background-color:initial">W</span><span style="background-color:initial">ISE web</span></a><br /></div> <div><a href=""><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/icgen.gif" alt="" />WISE on the Knut and Alice Wallenberg Foundation's website ​</a> <br /><a href="/en/departments/ims/news/Pages/Chalmers-part-of-new-3-billion-sek-research-initiative-on-materials-science-kaw.aspx"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/ichtm.gif" alt="" />Major research initiative on materials science</a><br /></div> <div><a href="/en/areas-of-advance/materials/Calendar/Pages/Materials-for-Tomorrow-2021.aspx"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/ichtm.gif" alt="" /><span style="background-color:initial">P</span><span style="background-color:initial">revious Materials for Tomorrow </span></a><br /></div> <div><br /></div> seminar - A nano focus on quantum materials<p>Chalmers Conference Centre, company, Chalmersplatsen 1, Kårhuset</p><p>​Save the date for the Excellence Initiative Nano Initiative seminar A nano focus on quantum materials.Read more on the conference page​</p>