Search results

We present a time division multiple access-orthogonal frequency division multiplexing (TDMA-OFDM)-based radio interface proposal for the Universal Mobile Telecommunication System (UMTS). We focus on synchronization and present an implementable algorithm for the tracking of the mobiles' time and frequency offsets at the base station in the uplink. This algorithm is based on estimation methods that

A new mechanical scanner design for a high-speed atomic force microscope (AFM) is presented and discussed in terms of modeling and control. The positioning range of this scanner is 13 mum in the X- and Y-directions and 4.3 mum in the vertical direction. The lowest resonance frequency of this scanner is above 22 kHz. This paper is focused on the vertical direction of the scanner, being the crucial

This paper describes a method for automatically initializing a self-tuning controller. The procedure can be used for systems that are adequately described by models of at most third-order with time delay. For this class of systems it gives a self-tuner that can be initialized simply by pushing a button.

This chapter analyses local strategies against poverty and social exclusion in Sweden, often seen as illustrative of a Social democratic welfare regime. The chapter addresses whether public actors play such a significant role in local anti-poverty strategies as established regime-debates suggest. Empirical investigations cover patterns of coordination between the social assistance system and activ

The major histocompatibility complex class I (MHC-I) has recently been shown not only to present antigens to the immune system but also to mediate transmembrane signaling, resulting in activation, inactivation, or apoptosis. Such signaling has been observed in both normal and malignant cells of the B and T cell lineage. Cross-linking of MHC-I on the pre-B- acute-lymphocytic cell line KM-3 induces

This article examines smallholders’ perceptions of climate variability in two districts in Northern Ethiopia, and the diversification options pursued within and outside agriculture. Meteorological records corroborate smallholders’ belief that temperatures are increasing but do not support assertions that rainfall is decreasing. Farm-level adaptation mainly involves soil and water conservation meas

This paper provides a review of research into financialisation of built environments, especially in relation to urban politics, social geographies and sustainability. Focus is limited here to the theoretical and conceptual substance of selected literature. Financialisation is conceptualised as a profoundly spatial process, forging social relations that form conditions for urban governance, social