Multibody dynamics model building using graphical interfaces

In recent years, the extremely laborious task of manually deriving equations of motion for the simulation of multibody spacecraft dynamics has largely been eliminated. Instead, the dynamicist now works with commonly available general purpose dynamics simulation programs which generate the equations of motion either explicitly or implicitly via computer codes. The user interface to these programs has predominantly been via input data files, each with its own required format and peculiarities, causing errors and frustrations during program setup. Recent progress in a more natural method of data input for dynamics programs: the graphical interface, is described

Preliminary Investigation of Continuous Self-Improvement, Mindfulness, & Positive Thinking

https://fuse.franklin.edu/ss2018/1044/thumbnail.jp

Identification and evaluation of key factors for rehabilitation of shores denuded of mussels (Perna perna) along the Transkei Coast, South Africa

Mussels play an important supplementary role in the diet of local communities on the Transkei coast in the Eastern Cape province of South Africa. The exploitation of mussels date back to about 1350 years ago, but in the last 3 decades, exploitation of the brown mussel Perna perna has become unsustainable with mussels collected as small as 30-40mm when they are only just sexually mature. Dye and Dyantyi (2002) developed a technique to rehabilitate areas denuded of adult mussels. The government sponsored Mussel Rehabilitation Project (MRP) to use this technique but only some sites have been successfully rehabilitated, reaching c. 80 % cover within a year whilst others only reach about 5%. At an unexploited site (Riet River), I tested the effects of mussel size and wave strength on the effectiveness of the rehabilitation technique, hypothesizing that different size classes may respond differently due to differences in their energy allocation (growth vs reproduction), while wave action determines food supply. Small (1-2cm) and large mussels (3-4cm) were deployed for rehabilitation at 2 exposed and 2 sheltered sites, separated by 100s m. A similar study was repeated in Coffee Bay where shores are exploited. Six sites were selected, 3 sites that had been successfully rehabilitated and 3 that were unsuccessful according to the MRP. Again, two size classes were used but these differed from the first experiment. Mussels of 3-4cm size were now rated as small and 5-6cm as large. Two methods were used to re-attach mussels, the original and the same method with the addition of mesh bags during mussel deployment. Treatments were examined on three occasions at approximately one month intervals. At Riet River, the sites chosen did not show differences in wave strength (measured using dynamometers) or water flux (measured using erosion of cement balls) so that water motion was excluded from the analyses. Small mussels grew faster and had weaker attachment than large mussels. There was no difference in condition index between small and large mussels, or in the numbers of recruits settling among the byssus threads of deployed mussels of the two size classes. In Coffee Bay, there was no relationship between rehabilitation success and maximum wave force, and no difference in bulk water flux among sites. Small mussels deployed using mesh bags survived better than non-meshed or large mussels of either treatment. There was no difference in condition index (CI) between mesh and no-mesh, or between small and large mussels. As in the case of Riet River, small mussels grew faster than large mussels, but large mussels attached stronger than small mussels, with no effect of mesh. Although the factors that improve reseeding of mussels can be identified (use of mesh, use of small mussels, choice of sites with high recruitment rates), successful long-term rehabilitation requires appropriate subsequent management of re-seeded sites

Exploration of Bis-amino Acid Scaffolds Designed to Self Assemble

Based on theoretical models scaffold 13 was predicted to self assemble through intermolecular hydrogen bonds.  The synthesis of scaffold 13 was successfully synthesized using standard Fmoc Solid Phase Peptide Synthesis.  Connectivity was confirmed through full structural characterization.  Scaffold 13 was probed for its ability to self-assemble in DMSOd6 in the presence of 0.2 percent TFA.  Our hypothesis for self-assembly of scaffold 13 was not supported under any of the conditions explored.  ROESY correlations failed to indicate self-assembly between interacting scaffolds and a variable temperature NMR study at three separate concentrations also failed to provide evidence of self-assembly

Factors of inclusive education for children with autism (UK experience)

This article identifies factors, which influence the successful inclusion of children and young people with ASD in mainstream schools in the UK. The results present seven themes that are identified from the literature as factors that influence the successful inclusion of individuals with ASD within mainstream schools. The identified themes are: Support Staff, Communication, Staff Training, Relationships with Peers, Interventions and Teaching Strategies, Organisational Culture and Attitudes and Relationships with Teacher. The implications associated with these factors are then discussed

Acordos parassociais: admissibilidade e restrições em matéria de administração nas sociedades anónimas

O tema da presente dissertação surge da necessidade de compreender de forma mais aprofundada a determinação do direito aplicável à conformidade dos acordos parassociais nas sociedades anónimas fora e dentro da sociedade, entender a sua admissibilidade e limitações gerais ao seu conteúdo. Ainda assim, com o presente estudo pretende-se determinar se, mediante a invalidade dos acordos parassociais, quais os procedimentos legais a luz do ordenamento jurídico português e quais as consequências do alcance da parte final do nº 2 do artigo 17º do CSC, sendo refletidos acordos relativos há eleições dos administradores, sobre a fixação de remunerações e acordos que incidem sobre estratégias de gestão. Para tal, também será efetuada uma análise estruturada e consistente das razões para proibição de acordos parassociais sobre a atuação dos membros do órgão de administração, através das normas imperativas e normas supletivas, do respeito pelo princípio da tipicidade e pela distribuição legal de competências, do interesse social das sociedades anónimas e das responsabilidades dos administradores. Apesar de já existir pesquisa neste campo – acordos parassociais - torna-se importante compilar informações relevantes deste instituto jurídico e levar ao conhecimento dos profissionais de direito o impacto que sobre este se reflete nas sociedades, aos sócios, bem como aos terceiros. Contudo procura-se um trabalho o mais desenvolvido possível, devido à existência de inúmeros os fatores que influenciam os relacionamentos de um acordo parassocial, mas será impossível efetuar uma única abordagem que envolva todos os pontos de vista possíveis, pois certamente não se esgotarão todas as possibilidades de análise do tema, o qual deverá continuar a ser desenvolvido por outros trabalhos

Estimating Torque Imparted on Spacecraft Using Telemetry

There have been a number of missions with spacecraft flying by planetary moons with atmospheres; there will be future missions with similar flybys. When a spacecraft such as Cassini flies by a moon with an atmosphere, the spacecraft will experience an atmospheric torque. This torque could be used to determine the density of the atmosphere. This is because the relation between the atmospheric torque vector and the atmosphere density could be established analytically using the mass properties of the spacecraft, known drag coefficient of objects in free-molecular flow, and the spacecraft velocity relative to the moon. The density estimated in this way could be used to check results measured by science instruments. Since the proposed methodology could estimate disturbance torque as small as 0.02 N-m, it could also be used to estimate disturbance torque imparted on the spacecraft during high-altitude flybys

Cattle milk and meat research and development in Botswana

Meeting: ILCA Workshop on Collaborative Cattle Milk and Meat Research in East and Southern Africa, 12-15 June 1989, Harare, Z