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2281 Uppsatser om Logistic population growth - Sida 22 av 153
Urban Agriculture i den hållbara staden : en fältstudie i Managua
The way we design our cities today will affect the living conditions for future generations. Planning as a discipline can become crucial to attain a sustainable urban development with an increased quality of life among the urban population and an improved environment.
Urban Agriculture in the Sustainable City -a case study in Managua is a Diploma Work that deal with poverty issues, aspects of sustainability and development work. We have had a theoretical starting-point, but our focus has been on the case study i.e. the practical part, that we carried out in Managua, the capital of Nicaragua.
Today about half of the worlds 6,3 billion people live in cities. The demographic growth of the countryside has declined, while the population in the cities is considerably increasing.
Läkemedlet Oxazepam påverkar abborryngel : Exponering under embryonalutvecklingen ger effekter på tillväxt, överlevnad och beteende
Pharmaceuticals are environmental pollutants that are a major threat to aquatic ecosystems and very little is known about their ecological consequences. In this study growth, survival and behaviour (sociability, activity and boldness) of perch fry (Perca fluviatilis) were examined in order to study the possible effects of exposure to a benzodiazepine anxiolytic drug, Oxazepam, during embryonic development. The study tested following hypotheses: (1) perch growth is affected positively by exposure during embryonic development; (2) early perch survival is affected positively by exposure during embryonic development; and (3) boldness and activity increases while sociability decreases in perch fry exposed during embryonic development. Embryos of naturally spawned perch were exposed to water with two different concentrations of Oxazepam. The embryos were exposed during different parts (24-hour periods) of the embryonic development, because embryos may be more vulnerable at certain times during embryonic development and/or because the exposure at different times can produce different effects.
Påverkar suggors grymtande under digivningen smågrisarnas tillväxt? :
The pig is unique in the way that it gives birth to a large number of newborns in
each litter. Because of this the sow has developed a special behaviour during
suckling to ensure that not only a part of the litter gets all the milk. Milk is only
available during milk letdown. The piglets have to massage the udder for a long
time before letdown and the more piglets at the udder the sooner the milk comes.
The sow has developed a special grunting pattern to let the piglets know when she
is ready for suckling and to signal milk letdown.
Our aim with this study was to investigate if sows have individual grunting
patterns repeated over time. We also wanted to know if sows with a more distinct
grunting pattern have better growth in their litters.
Wild boar paradise : What makes the Swedish wild boar reproduce more or less successfully?
Due to the growing wild boar (Sus scrofa L.) population in Sweden there has been an increase in wild boar related traffic accidents, damage on cropland, and conflicts regarding the management of the wild boar. Knowing what makes the wild boar reproduce and survive more or less successfully in different geographic areas is an important part of managing the population. According to previous studies the wild boars rate of increase varies from county
to county. The aim of this study was to test, on the county scale level, if landscape composition and diversity as well as people and hunter densities might be the reason for this
variation. The first hypothesis was that a big proportion of forests and cropland would increase the rate of increase.
Nyttoforskning. En studie av den svenska forskningsfinansieringen för humaniora och samhällvetenskap med Riksbankens Jubileumsfond som exempel.
In this paper I argue that the development of innovation ideas within the financial system of scientific research might have a counterpart within the financial system of the social sciences and the arts. The ideas of innovation share a common way to evaluate science in terms of how well it can contribute to economic growth. In the past two decades a similar development can be observed within Riksbankens Jubileumsfond (RJ), one of the largest external financiers of the social sciences and the arts in Sweden. The idea of evaluating research used by the innovation ideas has grown popular within RJ, only it seems they evaluate research in terms of how well it fits into an international research community rather than how much it can contribute to economic growth as is the case within the innovation ideas. By examining the different ways of financing research that RJ has used during the last 2 decades, this paper aims to introduce a new perspective in which it is possible to understand the development within this type research funding as a part of a bigger system of development..
Ung och full : en kvantitativ studie om ungas riskbruk av alkohol
Recent statistic shows that about 28% of adolescents living in Stockholm drink alcohol at such a high level that their consumption counts as risky drinking. The correct term to use in this matter would be binge drinking adolescents. In the more wealthy areas of Stockholm this group of binge drinking adolescents counts for as much as a third of the population. In contrast, the adolescents living in exposed areas do not drink nearly as much. Binge drinking adolescents in these areas only counts for 15%, nearly half as much as in the wealthy areas.In light of this the intentions of this study is to investigate which explanatory factors that can clarify the range-rated differences in binge drinking between adolescents in Stockholm.
Havsöringens (Salmo trutta) lekvandring i Själsöån, Gotland.
In this study, the sea trout (Salmo trutta) spawning migration was studied in the river Själsöån, Gotland, to assess the main external factors determining upstream migration and seasonal changes in fish parameters. Additionally population trends were studied by examination of old data. The most important external factors for upstream migration were the air pressure, air temperature and wind direction. No significant difference was found between when males and females migrated upstream. Larger females in better condition started migration earlier than the smaller females in poorer condition.
Är bor nödvändigt vid skogsgödsling i Sverige?
This thesis has been made on behalf of SCA Skog AB to assess the need of boron in Swedishforest fertilization. Boron has been added to Swedish forest fertilizers since the beginning of the1980s. This makes the fertilizers more expensive and therefore has the necessity of boron inSwedish forest fertilization been raised.The Swedish bedrock generally contains small amounts of boron. The boron in the bedrock istightly bound to the mineral tourmaline and mostly unavailable for plants. This leads to that thecontribution of boron to the soil from weathering is very low besides soils with marinesediments.
Genomisk selektion och uppbyggnaden av avelsprogram hos mjölkkor
During the last decade a new technique in animal breeding has developed called genomic selection. It is based on estimations of the effect from genetic markers on traits that are calculated in a reference population. By genotyping individuals, genomic breeding values can then be estimated without phenotypic observations. The aim of this essay is to investigate the response of genomic selection on breeding schemes for dairy cattle. The accuracy of the genomic breeding values is affected by the proportion of observations included in the validation set and how often the equation for estimating breeding values is reevaluated.
Uttorkningsmöjligheter i ett fuktskadat badrum med hjälp av spaltmetoden
Buildings today are built to maintain a healthy indoor environment and an efficient energy usage which is probably why damages caused by dampness has increased since the 1960?s.A study between year 2008 and 2010 showed that 26 percent of the 110 000 examined houses had damages and flaws caused by dampness that could prove to be harmful later on. This means that one out of four bathrooms risk the chance to develop damages by dampness. Approximately 2 percent of the houses had already developed water damages. It is here where the problems appear.
Kartläggning av fallriskfaktorer för äldre i ordinärt boende inom landstingen Västmanland och Uppsala län (underlag för intervention)
AbstractObjective: To investigate the occurrence of and the risk factors for falls and to investigate level of fall-related self-efficacy and health-related quality of life in people living in community living, 75 years or older within Uppsala and Västmanlands county. A further aim was to identify predictive risk factors for falls. Design: A cross-section study with a descriptive, comparative and correlative design based on a questionnaire was used. Participants: The participants were recruited from Uppsala and Västmanlands county. A random selection on 525 individuals was done, from a population based sample, in the detailed municipalities.
Lönsamhetskalkyl för produktion av gran på markavvattnad och askgödslad myrmark
In Sweden there are about 4 million hectares of bare peat (mire). This land has great potential to be transformed into productive forest land, provided drainage is carried out and, in some cases, even fertilization with ashes. Drainage of mires is necessary because the high groundwater table prevents trees from growing due to reduced oxygen availability. Some of the key nutrients that trees need to grow appear in too small quantities in mires, especially potassium (K) and phosphorus (P). Ash from the combustion of biomass contains these elements and is therefore suitable as a fertilizer.
Impact of Regulations on Innovation Performances in EU:
Innovation has been identified as one of the key factors for economic growth long ago. However, the emergence of ?knowledge century? further strengthened the role of the concept since proper management of the knowledge is essential to make the best out of the innovative capacity of the companies as well as the countries. This necessitates a balanced intellectual property rights (IPR) systems, since these rights provide the basis to solve the market failures faced by innovating firms by creating property rights over knowledge. There is an inherent dilemma between invention and diffusion.
?Jag tyar inte idag!? En kvalitativ studie om motivationsfaktorer till fysisk aktivitet i samarbete med Centralsjukhuset i Kristianstad
Physical activity is required for a good health and science shows a clear connection between exercise and a lower risk for disease. Still, the physical activity among the population is far from good. It is the individuals own responsibility to exercise, but the society also has a responsibility to give opportunities to exercise for the population. The aim with the study was to investigate what motivated the group of physical active people to use the Central hospital in Kristianstad?s health program.
Hållbar utveckling + turism = sant? Intressen inom projektet Exportmogen destination i biosfärområdet Vänerskärgården med Kinnekulle
This essay examines whether, and if so to which extent, the project Export MatureDestination in the Biosphere Reserve Vänerskärgården with Kinnekulle can combine the goalof the tourism industry, i.e. to double tourism between 2010 and 2020, and the goals of theBiosphere reserve, i.e. sustainable societal development and a sustainable biosphere economy.The aim is to examine how key individuals in the project approach sustainable developmentand economic growth, representing the two main interests in the area. Examining the state ofthe two interests the following examples are used: the position of sustainable development inregard to economic growth, the opportunities and challenges in the area and unity concerningthe goals of the tourism development in the region. The study is conducted through qualitativeinterviews with key individuals and a descriptive document analysis of the most importantpolicy documents.