Towards a low carbon economy in the Amazon: the role of land-use policies

Climate change, rising oil prices and the global financial crisis has put sustainability and ‘green growth’ of the economy on the political agenda. While the transition towards a “low carbon” economy in developed countries like in the European Union should mainly be found in renewable energy production, developing countries like Brazil face with high land use emissions which will further rise in the coming decades without proper policy instruments. Deforestation and cattle production are the main sources of land use emissions in Brazil and we expect that these emissions will further rise with liberalisation of agricultural trade. A transition towards a “low carbon” economy in Brazil thus calls for appropriate, and effective land-use policies. Agricultural intensification on one hand can meet the world demand for soy and beef. For example we calculate that increasing the meat content of cattle can reduce emissions from deforestation up to 30%, but intensification may also accelerate further deforestation of Cerrado and Amazon forests. In order to avoid such additional deforestation, large areas of degraded lands have to be taken back into production, which requires large agricultural investments. In addition, (new) economic instruments, monitoring, law enforcement and appropriate conservation policies are also needed to halt further deforestation and biodiversity loss. The recently amended change of the Forest Code policy, for example, is expected to accelerate deforestation further, thus making more difficult to reach mitigation targets for the Brazilian State

Is Small Perfect? Size Limit to Defect Formation in Pyramidal Pt Nanocontacts

We report high resolution transmission electron microscopy and ab initio calculation results for the defect formation in Pt nanocontacts (NCs). Our results show that there is a size limit to the existence of twins (extended structural defects). Defects are always present but blocked away from the tip axes. The twins may act as scattering plane, influencing contact electron transmission for Pt NC at room temperature and Ag/Au NC at low temperature.Comment: 4 pages, 3 figure

Solid Freeform Fabrication of Functional Silicon Nitride Ceramics by Laminated Object Manufacturing 1

The processing of silicon nitride (Si3N4) structural ceramics by Laminated Object Manufacturing (LOM) using ceramic tape preforms was investigated. The key processing stages involved green shape formation (which used the LOM process), followed by the burnout of all organics, and final densification by pressureless sintering. Two material systems were considered. These were a) monolithic Si3N4 and b) a preceramic polymer infiltrated Si3N4. The raw materials for the process were tape preforms of Si3N4, which were fabricated by standard tape casting techniques. Mechanical property data obtained for the LOM processed Si3N4 showed high strength and fracture toughness values. The room temperature and high temperature (1260 o C) flexural strengths were in the range of 700-900 MPa and 360-400 MPa, respectively. The fracture toughness averaged from 5.5-7.5 MPa.m1/2. These strength and fracture toughness values are comparable to those reported for conventionally prepared Si3N4 ceramics. Thus, this research demonstrated that the LOM technique is a viable method for preparing functional Si3N4 ceramics with good physical and mechanical properties.Mechanical Engineerin

Relationship and sexual quality in the wake of COVID-19: Effects of individual regulatory focus and shared concerns over the pandemic

Research has shown mixed findings regarding the effect of the COVID-19 pandemic on relation-ship and sexual quality and activity. We argue that some of these findings might be understood considering people’s predisposition to maintain safety (i.e., prevention focus) or take risks (i.e., promotion focus), and sharing concerns with one’s partner about the pandemic. A longitudinal study (N = 153) tested if regulatory focus before the pandemic (November 2019) was associated with relationship quality, sexual quality, and joint sexual activity later on (June 2020) and whether these effects were moderated by shared concerns over the pandemic. Results showed that participants more focused on prevention experienced higher relationship quality later on, but also less sexual quality and less frequent joint sexual activity, when they shared fewer (vs. more) con-cerns with their partner. In contrast, participants more focused on promotion experienced higher relationship quality later on when they shared more (vs. less) concerns with their partner. These results indicate how individuals’ regulatory focus and shared concerns in times of crisis, such as the COVID-19 pandemic, can have downstream consequences on people’s relational and sexual dynamics. We offer insights for mental health professionals to improve psychosocial health and well-being when people are faced with critical events.info:eu-repo/semantics/publishedVersio

Having a prevention regulatory focus longitudinally predicted distress and health‐protective behaviors during the COVID‐19 pandemic

People focused on prevention (vs. promotion) are motivated by safety and are less inclined to take risks. We tested if having a prevention (vs. promotion) focus before the COVID-19 pandemic outbreak predicted threat perceptions and health outcomes throughout the pandemic. Participants (N = 161) took part in a longitudinal study. Measures were assessed before the pandemic was declared (on November 2019, T1) and after a global pandemic was declared (on June 2020, T2). Participants who were more focused on prevention prior to the onset of the pandemic (at T1) perceived greater risk and were more worried about contracting COVID-19 and engaged in more preventive behaviors during the pandemic (at T2). They also reported less anxiety and felt healthier (at T2). Exploratory analyses revealed that enacting preventive behaviors helped people cope with pandemic-related anxiety. Being motivated by security and enacting preventive behaviors seems to have helped people reduce anxiety over risk even during the pandemic.info:eu-repo/semantics/publishedVersio

From fundamental science to product : a bottom-up approach to sunscreen development

Despite the pivotal role of ultraviolet (UV) radiation in sustaining life on Earth, overexposure to this type of radiation can have catastrophic effects, such as skin cancer. Sunscreens, the most common form of artificial protection against such harmful effects, absorb UV radiation before it reaches vulnerable s kin cells. Absorption of UV radiation prompts ultrafast molecular events in sunscreen molecules which, ideally, would allow for fast and safe dissipation of the excess energy. However, our knowledge of these mechanisms remains limited. In this article, we will review recent advances in the field of ultrafast photodynamics (light induced molecular processes occurring within femtoseconds, fs, 10 - 15 s to picoseconds, ps, 10 - 12 s) of sunscreens. We follow a bottom - up approach to common sunscreen active ingredients, analysing any emerging trends from the current literature on the subject. Moreover, we will identify the main questions that remain unanswered, pinpoint some of the main challenges and finally comment on the outlook of this exciting field of research

Product renovation and shared ownership: sustainable routes to satisfying the world's growing demand for goods

It has been estimated that by 2030 the number of people who are wealthy enough to be considered as middle class consumers will have tripled. This will have a dramatic impact on the demands for primary materials and energy. Much work has been carried out on sustainable ways of meeting the World’s energy demands and some work has been carried out on the sustainable production and consumption of goods. It has been estimated that with improvements in design and manufacturing it is possible to reduce the primary material requirements by 30% to produce the current demand for goods. Whilst this is a crucial step on the production side, there will still be a doubling of primary material requirements by the end of the century because of an absolute rise in demand for goods and services. It is therefore clear that the consumption of products must also be explored. This is a key areas of research for the UK INDEMAND centre, which is investigating ways of reducing the UK’s industrial energy demand and demand for energy intensive materials. Our ongoing work shows that two strategies would result in considerable reductions in the demand for primary materials: product longevity and using goods more intensively (which may requires increased durability). Product longevity and durability are not new ideas, but ones that can be applied across a raft of goods as methods of reducing the consumption of materials. With long life products there is a potential risk of outdated design and obsolescence, consequently there is a need to ensure upgradability and adaptability are incorporated at the design stage. If products last longer, then the production of new products can be diverted to emerging markets rather than the market for replacement goods. There are many goods which are only used occasionally; these goods do not normally wear out. The total demand for such could be drastically reduced if they were shared with other people. Sharing of goods has traditionally been conducted between friends or by hiring equipment. The use of modern communication systems and social media could enable the development of sharing co-ops and swap spaces that will increase the utilisation of goods and hence reduce the demand for new goods. This could also increase access to a range of goods for those on low incomes. From a series of workshops it has been found that the principal challenges are sociological rather than technological. This paper contains a discussion of these challenges and explores possible futures where these two strategies have been adopted. In addition, the barriers and opportunities that these strategies offer for consumers and businesses are identified, and areas where government policy could be instigated to bring about change are highlighted

Produção de biossurfactante por Aureobasidium thailandense utilizando resíduos agroindustriais

info:eu-repo/semantics/publishedVersio