Relationships between tree and soil properties in Picea abies and Pinus sylvestris forests in Sweden

The exchange of elements between plants and the soil in which they are growing creates reciprocal control of their element composition. Within plants, the growth rate hypothesis from ecological stoichiometry implies a strong coupling between C, N, and P. No similar theory exists for predicting relationships between elements in the soil or relationships between plants and the soil. We used a data set of element concentrations in needles and humus of Scots pine (Pinus sylvestris) and Norway spruce (Picea abies) forests in Sweden to investigate the extent to which relationships between elements (C, N, P, S, K, Ca, Mg, Fe, Mn, Al) can be observed within and between plants and soils. We found element composition to be more strongly controlled in needles than in humus. Elements that are covalently bound were also more strongly controlled, with no apparent differences between macro- and micronutrients. With the exception of N/C, there were surprisingly few relationships between elements in needles and humus. We found no major differences between the two tree species studied, but investigations of additional forest types are needed for firm conclusions. More control over element composition was exercised with respect to N than C, particularly in needles, so it might be advantageous to express nutrient concentrations relative to N rather than on a dry weight or carbon basis. Variations in many ecosystem variables appeared to lack ecological significance and thus an important task is to identify the meaningful predictors

Change, reorganization and quality of home carefor elderly people in Sweden during the 1990s : paper to 17:e Nordiska konferensen i gerontologi 23-26 maj 2004 i Stockholm

During the 1990s several kinds of reorganization has taken place in public services in Sweden. Reorganizations according to the idea of market economy have been most salient and debated. In many municipalities private companies have started to organize home care service for elderly, financed by tax. Public home care organizations have reorganized the working organization and managing structure, partly to save money and partly to reach better quality of care. The home care services have a key role in the care of the elderly in the society. The quality of care is important for the possibility for elderly to stay as long as possible in their ordinary homes. We have performed a longitudinal study of the reorganizations during the 1990s in order to explore the consequences for quality of care. The study was performed in seven districts in three different municipalities representing different types of municipalities and different kinds of reorganizations. It comprises private companies, traditional public organizations, public organizations with changed managing structure and co-ordination of home help and home health care. Quality of care is studied through assessment of the communication in the organization, the psychosocial working environment of the caregivers and the quality of the care work. Politicians, managers, ca. 100 care givers and ca. 500 elderly receiving help and care have been interviewed four times during the period (1993, 1995, 1997 and 2002/2003). The traditional organization within small districts with small autonomous working teams and easy accessible supervisor expose the best quality. There are no unambiguous differences between public and private organizations. There is however a tendency for successive decline of quality for private companies after they have been established. Other aspects of the reorganizations, e. g. to have special officials for assessment of help need, do not contribute to better quality but create new communication gaps in the organization and have negative influence on the working environment. Stability in the composition of the care worker teams, leadership, decision-making processes in the organization and the district area promote high quality of care. The reorganizations during the 1990s seem on the whole to function contrary to promotion of high quality in the care and service for the elderly

Combustion Chambers for Natural Gas SI Engines Part I: Fluid Flow and Combustion

The most economical way to convert truck and bus DI-diesel engines to natural gas operation is to replace the injector with a spark plug and modify the combustion chamber in the piston crown for spark ignition operation. The modification of the piston crown should give a geometry well suited for spark ignition operation with the original swirling inlet port. Ten different geometries were tried on a converted VOLVO TD102 engine and a remarkably large difference in the rate of combustion was noted between the chambers. To find an explanation for this difference a cycle resolved measurement of the in-cylinder mean velocity and turbulence was performed with Laser Doppler Velocimetry (LDV). The results show a high correlation between in cylinder turbulence and rate of heat release in the main part of combustion. The very early part of combustion is more affected by other parameters but the intermediate part of combustion corresponding to 0.5-10% of the total heat released is influenced by both mean velocity and turbulence. There is a surprisingly good correlation between the average level of turbulence and the used squish area

The frail elderly, family network and public home help services : a pilot study of the parties' perception of the help and their reciprocal relationships

The family with the elderly and the home help workers’ team constitute two organisations, which meet in the care work. In this context the family is extended and often constitute not only members from the nuclear family but also other members of the network of relatives, whom take part in the care of the elderly. The extended family may in some cases include four generations (Finch & Mason, 1993). Home-help for elderly people have expanded in Sweden during the period 1960 - 1980. This was due partly upon the prevailing ideology that it is important for frail elderly to stay in their own homes. Due to this expansion the local communities have developed their public home-care organisations. Different kinds of autonomous group organisation predominate (Olsson et al, 1995). Small work groups take responsibility for home help service in local areas. Home-helpers organise their job themselves, exchange experiences and give each other emotional support. In Sweden both home care and institutional care of the elderly has decreased during the 1980th and 1990th in spite of the fact that the proportion elderly over 80 years (4,5 % of the total population) has increased 60 % since 1980. Twenty-two per cent of the women and 16 % of the men over 80 were cared for in their own home 1996. This development is said to have caused relatives to care for their frail elderly in the homes side by side by the home help services in an increasing degree (Johansson, 1991; Szebehely, 1998). Public care and service has an important impact on the interaction pattern between family members (Hendriksen, 1989; Johansson, 1999; Bass m fl, 1999). Home care may serve as an intervention that influences the health, well-being and life quality of the elderly and other family members. This intervention may have positive as well as negative effects. Problems and conflicts may arise in the interaction between the family members and between the family and the public help services (see McGoldrick & Gerson, 1989). We need more knowledge about these processes. In a research project1 the family and the home help services are studied as two organisations, which interact in the care of the elderly. We start with the hypothesis that the relation between the parties will have an impact on the character and quality of the care. We also think that the quality of the interaction will have an impact on the health and wellbeing of the elderly (see Olsson, 1991, 1998; Olsson & Ingvad, 1999)

Collaborative Creativity

This chapter is based on the author’s research on group creativity and educational initiatives in the private and public sectors as well as in higher education courses at an advanced level. The contribution is derived from both qualitative and quantitative methodological approaches to present in-depth knowledge of creative collaboration and competence as well as training of the necessary skills needed to activate both the prerequisites and predictors for creativity. Research shows correlations between experiences of flow in idea-generating group activities and group members’ integrative social behavior. In addition, it is shown that training for increased divergent thinking also develops broadened attention, openness, and flexibility for perspective shifts. A conceptual framework is presented to construct a model of research design on collaborative creativity with the purpose of enabling comparisons between study’s methodology and findings to continue developing this field of research with joint efforts. The chapter advances the view that the impact of activities training group-based creativity should be elevated in importance beyond individual brilliant ideas because creative collaboration develops abilities to take initiative, make decisions and interact constructively together

Effects of long-term N fertilization on nitrate leaching and vegetation responses in a spruce stand after severe wind damage

Wind damage in a forest stand can result in varying soil effects depending on the pre-history of the site, but areas with storm-felled trees can generally be expected to show more nitrate leaching than undamaged stands. Previous fertilization in such areas, especially with nitrogen (N) fertilizer, may further increase nitrate leaching. This study examined the effect of partial felling of a 42-year-old Norway spruce stand in the Skogaby experimental forest in Sweden during Storm Gudrun in 2005. Nitrate leaching was measured one year before and six years after the storm, in three experimental treatments: fertilization-irrigation with complete nutrient admixture (IF), fertilization with N-free nutrient admixture (V), and an untreated control (0). The 0 and IF treatments had some undamaged replicate plots, but V plots had no trees left after the storm. Compared with undamaged plots and the pre-disturbance level, nitrate leaching was significantly higher in all storm-felled plots, and in the soil solution nitrate dominated strongly over ammonium. Leaching peaked during the second and third post-storm years (2006-2007) and decreased to near pre-storm levels during the fifth and sixth years (2009-2010). Total nitrate leaching 2005-2010 was estimated to be 414, 233, and 218 kg N ha(-1) in the damaged IF, 0, and V plots, respectively. Total nitrate leaching in undisturbed plots in the IF and 0 treatments was 37 and 0.3 kg N ha(-1), respectively. Ground vegetation coverage, biomass, and biomass N increased with time and were negatively correlated with nitrate discharge. However, plant uptake of N only partly explained the significant decline in nitrate leaching between 2006 and 2010. This decrease could also be explained by N immobilization in fungi decomposing woody roots with low N concentrations

A Turbocharged Dual-Fuel HCCI Engine

A 6-cylinder truck engine is modified for turbocharged dual-fuel Homogeneous Charge Compression Ignition (HCCI) engine operation. Two different fuels, ethanol and n-heptane, are used to control the ignition timing. The objective of this study is to demonstrate high load operation of a full-size HCCI engine and to discuss some of the typical constraints associated with HCCI operation. This study proves the possibility to achieve high loads, up to 16 bar Brake Mean Effective Pressure (BMEP), and ultra-low NOdx emissions, using turbo charging and dual fuel. Although the system shows great potential, it is obvious that the lack of inlet air pre heating is a drawback at low loads, where combustion efficiency suffers. At high loads, the low exhaust temperature provides little energy for turbocharging, thus causing pump losses higher than for a comparable diesel engine. Design of turbocharger therefore, is a key issue in order to achieve high loads in combination with high efficiency. In spite of these limitations, brake thermal efficiencies and power rating close to those of the original diesel engine are achieved with significant reduction in NOdx emissions. The maximum efficiency is 41.2%, which is slightly lower than for the original diesel engine

Klimatdimensioner i omsorg om äldre : utvecklingen av ett instrument för hjälpares och hjälpmottagares upplevelse av omsorgsrelationen

No abstract avialabl