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See detailSolids on Soli: Millimetre-Wave Radar Sensing through Materials
Čopič Pucihar, Klen; Attygalle, Nuwan T.; Kljun, Matjaž et al

in Proceedings of the ACM on Human-Computer Interaction (2022)

Detailed reference viewed: 58 (5 UL)
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See detailLes sols de la Grande Région SaarLorLux
Kubiniok, Jochen; Neumann, Barbara; Helfer, Malte UL et al

E-print/Working paper (2015)

The map "Soils of the Greater Region", extracted from the European Soil Database, presents the characteristic soil types of the Greater Region in a homogeneous classification.

Detailed reference viewed: 24 (0 UL)
See detailSolution 9: The Great Pyramid
Niermann, Ingo; Thiel, Jens; Miessen, Markus UL

Book published by Sternberg Press (2008)

Solution 9: The Great Pyramid is the first in the forthcoming Solution series where authors will be asked to develop an abundance of compact and original ideas for other countries and regions ... [more ▼]

Solution 9: The Great Pyramid is the first in the forthcoming Solution series where authors will be asked to develop an abundance of compact and original ideas for other countries and regions, contradicting the widely held assumption that, after the end of socialism, human advancement is only possible technologically or requires a yet-to-be-established world order. This book also documents the architectural proposals for the Great Pyramid, selected by a jury composed of Rem Koolhaas, Omar Akbar, Stefano Boeri, and Miuccia Prada. It also contains critical texts and voices from the press on this exceptional project. [less ▲]

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See detailA solution for Multi-Alignment by Transformation Synchronisation
Bernard, Florian UL; Thunberg, Johan UL; Gemmar, Peter et al

in The proceedings of the IEEE Conference on Computer Vision and Pattern Recognition (CVPR) (2015)

The alignment of a set of objects by means of transformations plays an important role in computer vision. Whilst the case for only two objects can be solved globally, when multiple objects are considered ... [more ▼]

The alignment of a set of objects by means of transformations plays an important role in computer vision. Whilst the case for only two objects can be solved globally, when multiple objects are considered usually iterative methods are used. In practice the iterative methods perform well if the relative transformations between any pair of objects are free of noise. However, if only noisy relative transformations are available (e.g. due to missing data or wrong correspondences) the iterative methods may fail. Based on the observation that the underlying noise-free transformations lie in the null space of a matrix that can directly be obtained from pairwise alignments, this paper presents a novel method for the synchronisation of pairwise transformations such that they are globally consistent. Simulations demonstrate that for a high amount of noise, a large proportion of missing data and even for wrong correspondence assignments the method delivers encouraging results. [less ▲]

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See detailA Solution in Search of a Problem : A Method for the Development of Blockchain Use Cases
Fridgen, Gilbert UL; Lockl, Jannik; Radszuwill, Sven et al

in 24th Americas Conference on Information Systems (AMCIS) (2018)

Blockchain technology is a very recent and fast evolving phenomenon with the potential to disrupt various industries. Organizations are thus increasingly looking at the technology and are forming multi ... [more ▼]

Blockchain technology is a very recent and fast evolving phenomenon with the potential to disrupt various industries. Organizations are thus increasingly looking at the technology and are forming multi-functional teams to evaluate the technology and its impact on their businesses. However, researchers and practitioners still lack a technology-driven, systematic approach to understand the potential of blockchain and to develop convincing use cases. We address this research gap by applying an action design research approach and situational method engineering to propose a method for the development of blockchain use cases. Following this approach, we iteratively evaluated and further developed the proposed method through application and testing in four distinct industries. We thus derive constructive knowledge at the cutting edge of digital transformation, innovation management, and utilization of emerging technologies. In addition, our research supports practitioners in systematically developing blockchain use cases. [less ▲]

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See detailSolution of implicit differential equations using desingularization theory
Castejon, Hector UL

Bachelor/master dissertation (2012)

Our goal in this work is to give an algorithmic method to find solutions of a LSS. To accomplish this objective, we will give a geometric description of the problem and use some geometric tools to ... [more ▼]

Our goal in this work is to give an algorithmic method to find solutions of a LSS. To accomplish this objective, we will give a geometric description of the problem and use some geometric tools to transform the equation and the manifold (the "ambient space") into a new set of equations, each one being an explicit ODE. When this is accomplished, one may apply Picard's theorem to these new systems to obtain the solutions. It is important to notice that (as many other theoretical results) Picard's theorem proves the existence of a solution but does not give an explicit method to nd it. Usually, in problems which require to find explicit solutions, numerical methods are used. There also exist numerical methods for solving LSS, so one may think that (since we will use numerical methods anyway to find the explicit solution) we could use them directly instead of wasting time implementing a method that will still depend on numerical approximations. The main point of using alternative methods for this kind of problem is (beyond the theoretical value of the algorithm) that, while numerical methods for explicit ODEs are usually accurate (in the sense that it is easy to control the error of the calculations), numerical approximations for an arbitrary LSS require (as it is explained in [RR02]) numerical inversions of quasi-singular matrices; these operations are numerically unstable. Therefore, the desingularization procedure studied here may allow to transform a numerically unstable problem into a new stable one. [less ▲]

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See detailThe solution of the immigrant paradox: aspirations and expectations of children of migrants
Beine, Michel UL; Montes Vinas, Ana Cecilia UL; Zanaj, Skerdilajda UL

E-print/Working paper (2020)

In this paper, we push forward the hypothesis that misalignment between expectations and aspirations crucially affects the educational outcomes of young adults. Using AddHealth, a dataset of 20,774 ... [more ▼]

In this paper, we push forward the hypothesis that misalignment between expectations and aspirations crucially affects the educational outcomes of young adults. Using AddHealth, a dataset of 20,774 adolescents between the grades 7-12, we show that the difference in school performance between migrant children and natives lies within the aspirations and expectations that migrant children form. More specifically, we find that positive misalignment between aspirations and expectations is a driving force for higher effort and better education outcomes of immigrant teenagers in the USA. This force resolves the well-known immigrant paradox. Furthermore, this result is specific to migrant children and does not hold for second-generation migrant pupils. [less ▲]

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See detailSolution of Two-dimensional Linear and Nonlinear Unsteady Schrödinger Equation using “Quantum Hydrodynamics” Formulation with a MLPG Collocation Method
Loukopoulos, Vassilios; Bourantas, Georgios UL

in Computer Modeling in Engineering and Sciences (2014), 103(1), 49-70

A numerical solution of the linear and nonlinear time-dependent Schrödinger equation is obtained, using the strong form MLPG Collocation method. Schrödinger equation is replaced by a system of coupled ... [more ▼]

A numerical solution of the linear and nonlinear time-dependent Schrödinger equation is obtained, using the strong form MLPG Collocation method. Schrödinger equation is replaced by a system of coupled partial differential equa tions in terms of particle density and velocity potential, by separating the real and imaginary parts of a general solution, called a quantum hydrodynamic (QHD) equa tion, which is formally analogous to the equations of irrotational motion in a classical fluid. The approximation of the field variables is obtained with the Moving Least Squares (MLS) approximation and the implicit Crank-Nicolson scheme is used for time discretization. For the two-dimensional nonlinear Schrödinger equation, the lagging of coefficients method has been utilized to eliminate the non-linearity of the corresponding examined problem. A Type-I nodal distribution is used in order to provide convergence for the discrete Laplacian operator used at the governing equation. Numerical results are validated, comparing them with analyti cal and numerical solutions. [less ▲]

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See detailA Solution to a Problem of D. Lau: Complete Classification of Intervals in the Lattice of Partial Boolean Clones
Schölzel, Karsten UL; Couceiro, Miguel UL; Haddad, Lucien et al

in Multiple-Valued Logic (ISMVL), 2013 IEEE 43rd International Symposium on (2013)

The following natural problem, first considered by D. Lau, has been tackled by several authors recently: Let C be a total clone on 2 := {0, 1}. Describe the interval I(C) of all partial clones on 2 whose ... [more ▼]

The following natural problem, first considered by D. Lau, has been tackled by several authors recently: Let C be a total clone on 2 := {0, 1}. Describe the interval I(C) of all partial clones on 2 whose total component is C. We establish some results in this direction and combine them with previous ones to show the following dichotomy result: For every total clone C on 2, the set I(C) is either finite or of continuum cardinality. [less ▲]

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See detailSolution-based Innovation : A Method for Emerging Technology Use Case Development
Fridgen, Gilbert UL; Lockl, Jannik; Radszuwill, Sven et al

in Workshop Blockchain Research ? Beyond the Horizon, European Conference on Information Systems (ECIS) (2018)

Interest in blockchain is growing rapidly and at a global scale. The potential to disrupt various industries is attributed to the emerging blockchain technology. Organizations and institutions have thus ... [more ▼]

Interest in blockchain is growing rapidly and at a global scale. The potential to disrupt various industries is attributed to the emerging blockchain technology. Organizations and institutions have thus begun to examine the emerging the technology and its impact on their businesses. However, researchers and practitioners still lack a systematic approach to understand the po-tential of blockchain and to develop convincing use cases. We addressed this research gap by applying an action design research approach and situational method engineering to propose a method for the development of blockchain technology use cases. Following this approach, we iteratively evaluate and further develop the proposed method through application in four distinct industries. In a next research step, we now focus on a broader context and evaluate if our existing use case development method is applicable for other emerging technologies than blockchain. By doing so, we seek to broaden our evaluation, generalize our method, and support practitioners and researchers in better leveraging the opportunities of continuous digital transformation. [less ▲]

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See detailSolution-based processing of Cu(In,Ga)Se2 absorber layers for 11% efficiency solar cells via a metallic intermediate
Berner, Ulrich Maximilian UL; Widenmeyer, Markus

in Progress in Photovoltaics (2014)

In this work, a low cost solution-based method for the deposition of uniform Cu-In-Ga layers compatible with roll-to-roll processing is described. As ink system we use metal carboxylates dissolved in a ... [more ▼]

In this work, a low cost solution-based method for the deposition of uniform Cu-In-Ga layers compatible with roll-to-roll processing is described. As ink system we use metal carboxylates dissolved in a mixture of a nitrogen containing base and an alcohol. This solution can be coated homogeneously under inert atmosphere using a doctor blade technique. With this method and appropriate precursor concentrations, crack-free metal layers with dry-film thicknesses of more than 700 nm can be deposited in one fast step. For the controlled film formation during the drying of the solvents a flow channel has been used to improve the evaporative mass transport and the convective gas flows of any unwanted organic species. Due to the absence of organic binders with high molecular weight, this step allows the formation of virtually pure metal layers. Elementary analyses of the dried thin films reveal less than 5 wt% of carbon residues at 200°C. In situ X-ray diffraction data of the drying step show the formation of Cu-In-Ga alloys. The subsequent processing of Cu(In,Ga)Se2 chalcopyrites with evaporated elemental selenium takes place in a separate tube oven under inert atmosphere. Photoelectric measurements of cells with CdS buffer and ZnO window layer reveal a short-circuit current of 29 mA/cm2, an open-circuit voltage of 533 mV, and a fill factor of 0.69 under standard conditions. Thus efficiencies of up to 11% on 0.5 cm2 area without antireflective coating have been achieved. [less ▲]

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See detailSolution-based synthesis of kesterite thin film semiconductors
Todorov, T.; Hillhouse, H. W.; Aazou, S. et al

in Journal of Physics : Energy (2020)

Detailed reference viewed: 114 (7 UL)
See detailSOLUTIONS Micro-scale modelling: method and initial results
Caruso, Geoffrey UL

E-print/Working paper (2005)

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See detailSolutions to achieve gender parity amongst national UNICEF Nepal staff
Muzzi, Mariana Elise UL

Bachelor/master dissertation (2019)

The United Nations (UN) has fallen short in meeting commitments - which date back to 1970 - to achieve gender parity. Conversely, UNICEF globally has achieved gender parity. This global average however ... [more ▼]

The United Nations (UN) has fallen short in meeting commitments - which date back to 1970 - to achieve gender parity. Conversely, UNICEF globally has achieved gender parity. This global average however hides a gender imbalanced workforce at the regional level, in country offices and in functional areas. At UNICEF Nepal, men are over-represented in the workforce. The most significant gender imbalance lies within the category of national staff. Based on analysis of Human Resources (HR) recruitment and workforce data and interviews with UN staff, the research identified potential reasons for the under-representation of Nepalese women. Nepalese women are not leaving their jobs any more than men, career development opportunities are similar for men and women, selection procedures do not discriminate against women, there are policies in place for flexible work arrangements. From this elimination process, the main reason for the under-representation of women at UNICEF Nepal is that only a small number of women are applying to positions in the first place. From an array of potential reasons for women not applying to UNICEF Nepal, UNICEF can address the perception that UNICEF is a boys’ club that is inflexible in terms of working arrangements. Next, the research explored solutions from other UNICEF country offices, UN entities, the private sector and academia. The study presented practical solutions for UNICEF Nepal to adopt: Temporarily hiring only women, talent outreach, adapting and creating new traineeship and fellowship programmes, better communicating UNICEF’s goals on gender parity and job advertisements tailored to women. Beyond its direct application to UNICEF Nepal, this paper could inspire reflection at the country office, regional office and headquarters on solutions to achieve a more diverse workforce respecting gender balance, equitable geographical distribution, caste and others. In sum, it could guide reflection on solutions for UNICEF to have a workforce more representative of the society. [less ▲]

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See detailSolvability of invariant systems of differential equations on the hyperbolic plane
Palmirotta, Guendalina UL

Speeches/Talks (2022)

In the Euclidean case, it is well-known, by Malgrange and Ehrenpreis, that linear differential operators with constant coefficients are solvable. However, what happens, if we genuinely extend this ... [more ▼]

In the Euclidean case, it is well-known, by Malgrange and Ehrenpreis, that linear differential operators with constant coefficients are solvable. However, what happens, if we genuinely extend this situation and consider systems of linear invariant differential operators, is still solvable? In case of Rn (for some positive integer n), the question has been proved mainly by Hörmander. We will show that this remains still true for Riemannian symmetric spaces of non-compact type X = G/K. More precisely, we will present a possible strategy to solve this problem by using the Fourier trans- form and its Paley-Wiener(-Schwartz) theorem for (distributional) sections of vector bundles over X. We will get complete solvability for the hyperbolic plane H2 = SL(2, R)/SO(2) and beyond. This work was part of my doctoral dissertation supervised by Martin Olbrich. [less ▲]

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See detailSolvability of systems of invariant differential equations on H2 and beyond
Palmirotta, Guendalina UL; Olbrich, Martin UL

E-print/Working paper (2022)

We show how the Fourier transform for distributional sections of vector bundles over symmetric spaces of non-compact type G/K can be used for questions of solvability of systems of invariant differential ... [more ▼]

We show how the Fourier transform for distributional sections of vector bundles over symmetric spaces of non-compact type G/K can be used for questions of solvability of systems of invariant differential equations in analogy to Hörmander’s proof of the Ehrenpreis-Malgrange theorem. We get complete solvability for the hyperbolic plane H2 and partial results for products H^2 × · · · × H^2 and the hyperbolic 3-space H^3. [less ▲]

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See detailSolvability of systems of invariant differential equations on symmetric spaces G/K
Palmirotta, Guendalina UL

Doctoral thesis (2021)

We study the Fourier transform for distributional sections of vector bundles over symmetric spaces of non-compact type. We show how this can be used for questions of solvability of systems of invariant ... [more ▼]

We study the Fourier transform for distributional sections of vector bundles over symmetric spaces of non-compact type. We show how this can be used for questions of solvability of systems of invariant differential equations in analogy to Hörmander’s proof of the Ehrenpreis-Malgrange theorem. We get complete solvability for the hyperbolic plane H2 and partial results for finite products H2 × · · · × H2 and the hyperbolic 3-space H3. [less ▲]

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See detailSolvation free energies and transfer free energies for amino acids from hydrophobic solution to water solution from a very simple residue model
Gu, Wei UL; Rahi, S. J.; Helms, V.

in Journal of Physical Chemistry B (2004), 108(18), 5806-5814

Solvation free energies of neutral amino acids in water and in chloroform were computed from extensive molecular dynamics simulations using multiconfiguration thermodynamic integration. The values ... [more ▼]

Solvation free energies of neutral amino acids in water and in chloroform were computed from extensive molecular dynamics simulations using multiconfiguration thermodynamic integration. The values computed for the AMBER force field are in very good agreement with available experimental data (rms differences of 5.1 kJ mol(-1) for the solvation free energies and 6.4 kJ mol(-1) for the transfer free energies of amino acids between water and chloroform) and with existing calculations. We derived an additive residue-scale solvation model formulated as the sum of a nonpolar term that is proportional to the molecular surface area and an electrostatic term (Kirkwood-Onsager model) for the hydration free energy of a dipole in a solvated cavity. This model can surprisingly well describe the solvation free energies in water and chloroform as well as the transfer free energies of amino acids between the two solvents when suitably adapted cavity radii are used. Root-mean-square differences of the predicted values with respect to the values calculated from thermodynamic integration are 1.8, 5.9, and 7.7 kJ mol(-1), respectively. [less ▲]

Detailed reference viewed: 183 (2 UL)
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See detailSolvent effects on crystal nucleation in colloidal suspensions
Schilling, Tanja UL

Scientific Conference (2013)

Detailed reference viewed: 44 (3 UL)