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The ambiguity domain plays a central role in estimating the time-varying spectrum of a non-stationary random process in continuous time, since multiplication in this domain is equivalent with estimating the covariance function of the random process using an intuitively appealing estimator. For processes in discrete time there exists a corresponding covariance function estimator. The ambiguity doma

BACKGROUND: The etiology and significance of flu-like symptoms often appearing before myocardial infarction should be clarified. METHODS: In a case-control study of 323 matched controls and a random sample of 110 out of 351 cases the presence of infection symptoms during the preceding four weeks before admission were asked and blood samples taken. RESULTS: Enterovirus (EV), herpes simplex virus (H

The analysis of the spectrum of Yb rn has been extended allowing us to establish 11 new energy level values. In addition, radiative lifetimes of two excited states of Yb III have been measured for the first time using time-resolved laser-induced fluorescence following two-photon excitation. The good agreement between experimental results and semi-empirical calculations performed with the relativis

This paper presents a technique for substantially reducing the noise of a CMOS low noise amplifier implemented in the inductive source degeneration topology. The effects of the gate induced current noise on the noise performance are taken into account, and the total output noise is strongly reduced by inserting a capacitance of appropriate value in parallel with the amplifying MOS transistor of th

Aims and objectives. The aim of this study was to investigate how a lifestyle intervention programme influences psychiatric and psychosocial factors among persons with psychiatric disabilities. Background. Persons with psychiatric disabilities often suffer from a simultaneous physical health problem, where circulatory disorder, hyperlipideamia, digestive disease, diabetes mellitus and obesity are

The time-dependent soft X-ray emission of helium and nitrogen plasmas generated by optical-field ionization is reported. The experiments were carried out by focusing pulses of the high-power Ti:sapphire laser of the Lund Institute of Technology (lambda = 796 nm, pulse duration 150 fs, pulse energy 150 mJ) to a 50-mu m diameter spot close to a nozzle, using He and N-2 as target gases. The emission

Objective: Oesophageal atresia is an congenital anomali with incidence of 1/3000-1/4500 live births. The results of reconstructive surgery has improved greatly, to 80-92% survival reported in the last two decades. The aim of this study was to determine the incidence of oesophageal atresia in Iceland and to evaluate the results of operations at the Department of Pediatric surgery at The Children's

The second of two reports from the conference Virtual City in Lund, Sweden, in 1998.

En unik intervjubok ger god inblick i påve Benedictus XVI:s tankevärld och i den speciella logik som utmärker den katolska kyrkans lära. Mot kritiken om otidsenlighet ställer påven ett evighetsperspektiv.

In a previous study from our laboratory, high tumor levels of tissue inhibitor of metalloproteinases-1 (TIMP-1) have been associated with an adverse response to chemotherapy in metastatic breast cancer suggesting that TIMP-1, which is known to inhibit apoptosis, may be a new predictive marker in this disease. The purpose of this study was to investigate the association between TIMP-1 and objective