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To describe patterns of leisure time physical activity during pregnancy in relation to pre-pregnancy leisure time physical activity, socio-demographic characteristics, fertility history, and lifestyle factors. 4,718 nulliparous with singleton pregnancy and intended spontaneous vaginal delivery were included in the study at gestational week 33 from May 2004 to July 2005. Information was provided by
Particles, climate change, and health have thought-provoking interactions. Air pollution is one of the largest environmental problems concerning human health. On the other hand, aerosol particles can have a cooling effect on climate and a reduction of those emissions may result in an increased temperature globally, which in turn may have negative health effects. The objective of this work was to i
This study explores how different types of information can support fire service operations during fire incidents through the concept of Smart Firefighting. Semi-structured interviews with 47 incident commanders across three countries have been applied to examine how different types of information (pre-planned, real-time, and predictive) affect decision-making. The findings strongly indicate that r
In generally, there is a phenomenon of “free rider” in the establishment of national oil reserves for different countries, which means that they have the tendency of underestimating the strategic oil reserves. This paper attempts to explain this phenomenon from the perspective of non-cooperative game theory. It also analyzes the establishment of strategic oil reserve among different countries base
This thesis explores the transport of thermally and optically excited electrons invarious nanowire structures. On one hand, electrons are thermally excited when thetemperature is nonzero, and the thermal energy help them surmount energy barriersthat are present in the material. On the other hand, when the electron distributionsat different part of the material are out-of-equilibrium due to thermal
In sensor network applications with low traffic intensity, idle channel listening is one of the main sources of energy waste. The use of a dedicated low-power wake-up receiver (WRx), which utilizes duty-cycled channel listening, can significantly reduce the idle listening energy cost. Extreme low-power design typically leads to performance losses, indirectly increasing energy costs. Striking the r
Voluntary agreements represent a policy instrument for applying new knowledge, routines or technology to specified issues. The traditional role of an authority when using information, and taking economic, or administrative measures is that of an initiator and controller. Voluntary agreements, on the other hand, represent a communication process between an authority and a partner where relations of
1.INTRODUCTIONBefore the phase-out of incandescent lamps in the EU, interior lighting was responsible for approximately 20% of average household electricity use in Sweden. To save energy and reduce greenhouse gas emissions, a major societal goal is to switch from light sources with low lm/W to ones with higher luminous efficacy and to reduce wasteful energy behaviour, while still meeting end user
In times of climate change political goals concern a reduction in total energy consumption and to use energy more efficiently. To achieve this, users need to transform their behaviour and start reflecting on their energy use. This paper discusses three different methods for visualising energy use, namely information tools, keeping time-diaries and using the 'Power-Aware Cord'. Each method has its
Energy is an important social resource on which we depend in our everyday lives; however, energy-related emissions constitute a major environmental load, so we need to use energy more efficiently. To develop sustainable energy systems, users should transform their behavior and start reflecting on their energy use. This paper discusses different methods for visualizing household energy use. We will
Solid oxide fuel cells (SOFCs) are promising candidates for future energy systems due to their ability to use renewable fuels and that they are energy efficient. A fully coupled two-dimensional computational fluid dynamics (CFD) model based on the finite element method (using COMSOL Multiphysics) is developed to describe an intermediate temperature SOFC single cell. Governing equations for various
The environmental impact of an extended property close source-separation system for solid household waste (i.e. a systems for collection of recyclables from domestic properties) is investigated in a residential area in southern Sweden. Since 2001, households have been able to source-separate waste into six fractions of dry recyclables and food waste sorting. The current system was evaluated using
Abstract in UndeterminedThe present paper describes how the control of a radiator system connected to a district heating (DH) network via a heat exchanger can be optimized to provide the lowest possible DH return temperature. This can be achieved for each operating point by employing an optimal combination of radiator circuit supply temperature and circulation flow rate. The control algorithm grad
The Kyoto target for Romania was to reduce its carbon dioxide emissions by 8 % from the 1989 levels. The 1989 emissions were around 260 million tones. In 2000 the net CO2 emission - some 125 million tones - were 54% of the net CO2 emission in the reference year -1989, leaving some 115 million tones as a reserve or as a tradable resource to other countries that can not met their Kyoto targets. Assu
There is compelling evidence that more diverse ecosystems deliver greater benefits to people, and these ecosystem services have become a key argument for biodiversity conservation. However, it is unclear how much biodiversity is needed to deliver ecosystem services in a cost-effective way. Here we show that, while the contribution of wild bees to crop production is significant, service delivery is
