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We show how to calculate the encountered wave period distribution for a ship traveling with constant speed on a Gaussian random sea with a directionally distributed frequency spectrum. (C) 1998 Elsevier Science Ltd. All rights reserved.

In recent years, wave splitting in conjunction with invariant imbedding and Green’s function techniques has been applied with great success to a number of interesting inverse and direct scattering problems. The aim of the present paper is to derive a wave splitting for the Timoshenko equation, a fourth order PDE of importance in beam theory. An analysis of the hyperbolicity of the Timoshenko equat

A decomposition of the field of the wave equation in three dimensions is suggested. This wave splitting decomposes the field into two components such that in free space simple propagation properties are obtained. The inhomogeneous region is assumed to have a phase velocity variation that varies only in the radial coordinate r from the origin. The suggested wave splitting is a generalization of the

An inverse source problem associated with a semi-linear transport or one-way wave equation in one spatial dimension is considered. It is shown an analytic solution to the inverse problem can be given and furthermore, that this inverse problem of determination of a source function is ill-posed, and must be regularised. A novel regularisation scheme which combines least squares monotone approximatio

Composite materials, i.e, mixtures of two or more materials, are commonly used in industry, because they often have outstanding properties in comparison with the original materials. In many cases the inhomogeneities are on a very fine scale, which makes it difficult to perform a full numerical simulation of the material. On the fine scale we have rapid oscillations in the material parameters, but

Guide when communicating BECC job advertisements The recruitment process within BECC is the same as for other positions at Lund University and University of Gothenburg. However, this guide comes with some extra tips to increase the chances of more candidates with relevant competence applying for BECC-related positions. The guide is partly based on a survey at the 2023 BECC annual meeting which ask

https://www.becc.lu.se/sites/becc.lu.se/files/2024-04/Communication%20guide%20BECC%20job%20advertisements.pdf - 2026-07-22

The treatment of intershell interactions remains a major challenge in the theoretical description of strongly correlated materials. Most previous approaches considered the influence of intershell interactions at best in a static fashion, neglecting dynamic effects. In this paper, we propose a slave-rotor method that goes beyond this approximation by incorporating the effect of intershell interacti

Overview The pandemic has affected the Centre in different ways, most visibly perhaps in having to teach online, the lack of visitors, fewer public lectures and other events, and in the cutback on conference participation and fieldwork. Work to convert teaching to online platforms took place during the second half of the spring semester and during the second half of the fall semester. Considerable

https://www.ace.lu.se/work-report-2020-centre-east-and-south-east-asian-studies - 2026-07-21

Progamme evaluation of PhD education in media and communication studies: Statement from external expert group Page 1 of 18 STATEMENT FROM EXTERNAL EXPERT GROUP Reg. No. STYR 2023/2119 2024-09-12 Progamme evaluation of PhD education in media and communication studies: Statement from external expert group Assignment and external expert group The assignment of the external expert group (see compositi

https://www.sam.lu.se/en/internal/sites/sam.lu.se.en.internal/files/2024-09/statement-expert-group-final-report.pdf - 2026-07-22

Recent advances in instrumentation have sparked a transformative journey in materials science, providing insights into the intricate relationship between processing, structure and properties. Among them, cutting-edge in situ micro- and nanoscale mechanical characterization methods, equipped with exceptional spatial and temporal resolution, such as instrumented electron microscopy, X-ray imaging an

All together now: discover how the collective behaviour of atoms, humans, and birds inspire researchers to make new light-emitting materials and devices.

There were two principal objectives for this thesis. The first was to develop a methodology and evaluation model of moisture redistribution in order to make the future relative humidity in a screeded concrete slab predictable. The second objective was to develop a method to determine the critical humidity for ion transport in concrete. Residual moisture in screeded concrete slabs may be redistrib

An extensive research program, dealing with fire growth on combustible wall lining materials, has been ongoing in Sweden over the last decade. Several lining materials were tested in bench-scale fire tests in order to derive basic material flammability parameters. The same materials were also tested in a full scale room test and a 1/3 scale room test for two different scenarios, A and B. Scenario

From an inside point of view, the concept of a "unified science of materials" might appear to be quite natural in its own right, as it were. However, considering the fact that science in general is practiced by humans in a social environment, it should be warranted to examine materials science also from the humanistic and sociological perspectives, as well as against the background of current thin