We construct small-amplitude periodic water waves with multiple critical layers. In addition to waves with arbitrarily many critical layers and a single crest in each period, multimodal waves with several crests and troughs in each period are found. The setting is that of steady two-dimensional finite-depth gravity water waves with vorticity.

In this paper we provide necessary and sufficient conditions for strongly group graded rings to be simple. For a strongly group graded ring R the grading group G acts, in a natural way, as automorphisms of the commutant of the neutral component subring R_e in R and of the center of R_e. We show that if R is a strongly G-graded ring where R_e is maximal commutative in R, then R is a simple ring if

During excavations at Uppakra in Scania, Sweden, an exceptional copper alloy mount in the shape of a winged human was found. The figure is unique not only in its exquisite craftsmanship, but also in its iconography. It is argued that the mount was made in the loth century AD and that it depicts Wayland the Smith.

I argue that an evolutionary adaptation for bodily mimesis, the volitional use of the body as a representational devise, is the “small difference” that gave rise to unique and yet pre-linguistic features of humanity such as (over)imitation, pedagogy, intentional communication and the possibility of a cumulative, representational culture. Furthermore, it is this that made the evolution of language

The 18th century witnessed profound changes in the political thinking of Western societies regarding the individual, society and the state. The principle of freedom of religion was confirmed in the American Declaration of Independence in 1776 and in the French Declaration of the Rights of Man and of the Citizen in 1789. A guiding principle was that the civic rights of individuals were not to be de

Sperm number is often a good predictor of success in sperm competition; however, it has become increasingly clear that, for some species, variation in probability of paternity cannot be explained by sperm number alone. Intraspecific variation in ejaculate characteristics, such as the number of viable sperm and sperm longevity, may play an equally important role in determining fertilization success

Knowledge of interrater reliability in the evaluation of perfusion computed tomography (CTP) studies is very limited even though the method is widely used in the workup of acute stroke. The aims of this study were to estimate the inter- and intraolbserver agreement in the evaluation of CTP data and to evaluate the feasibility of the method. The CTP data of 20 consecutive patients (50% were females

We introduce a dengue model (SEIR) where the human individuals are treated on an individual basis (IBM) while the mosquito population, produced by an independent model, is treated by compartments (SEI). We study the spread of epidemics by the sole action of the mosquito. Exponential, deterministic and experimental distributions for the (human) exposed period are considered in two weather scenarios

Background: Respiratory agents may be detected in the oropharynx of healthy individuals. The extent of this condition and the reasons behind it are largely unknown. The objective of this study was to determine the factors associated with the presence of respiratory agents in the oropharynx of adolescents healthy enough to attend school activities. Methods: On a single day in December, samples from

Permafrost in peatlands of subarctic Sweden is presently thawing at accelerated rates, which raises questions about the destiny of stored carbon and nutrients and impacts on adjacent freshwater ecosystems. In this study we use peat and lake sediment records from the Stordalen palsa mire in northern Sweden to address the late Holocene (5,000 cal BP-present) development of the mire as well as relate

The psychometric properties of the Swedish self-report version of the Strengths and Difficulties Questionnaire (SDQ-s), and the prevalence of emotional and behavioral problems as measured by the SDQ-s, were studied in 14 to 15-year-old adolescents. The psychometric properties were found to be similar to those found in other language versions, in terms of similar factor structure and acceptable tes

Inherited mutations in the tumor suppressor genes BRCA1 and BRCA2 predispose carriers to breast and ovarian cancer. The authors have identified a mutation in BRCA2, 7845+1G > A (c.7617+1G > A), not previously regarded as deleterious because of incorrect mapping of the splice junction in the originally published genomic reference sequence. This reference sequence is generally used in many laborator

Johansson BB. Current trends in stroke rehabilitation. A review with focus on brain plasticity. Acta Neurol Scand: DOI: 10.1111/j.1600-0404.2010.01417.x. (c) 2010 John Wiley & Sons A/S. Current understanding of brain plasticity has lead to new approaches in ischemic stroke rehabilitation. Stroke units that combine good medical and nursing care with task-oriented intense training in an environm

A core-ionized H(2)O molecule in liquid water primarily relaxes through normal Auger decay, leading to a two-hole final state in which both valence holes are localized on the same water molecule. Electronic coupling to the environment, however, allows for alternative decays resembling Intermolecular Coulombic Decay (ICD), producing final states with one of the holes delocalized on a neighboring wa

“Mapped Bodies: Notes on the Use of Biometrics in Geopolitical Contexts” examines the role played by automated biometric technologies in migration control and in the so-called war on terror. Biometric methods such as automated fingerprint identification, iris scanning and facial recognition record microscopic bodily characteristics, computes patterns from them, and matches those patterns against a

Objectives To estimate the ability to discriminate between benign and malignant adnexal masses of different size using: subjective assessment, two International Ovarian Tumor Analysis (IOTA) logistic regression models (LR1 and LR2), the IOTA simple rules and the risk of malignancy index (RMI). Methods We used a multicenter IOTA database of 2445 patients with at least one adnexal mass, i.e. the dat

This doctoral thesis comprises a critical edition of a previously unpublished manuscript from the late seventeenth century, which is housed in Lund University Library. The manuscript consists of copies of eighty-eight letters and other documents in Latin. The originals were, in most cases, written by country vicars from Scania, a Swedish province that until 1658 was part of Denmark. The identity o