The value creation radar applied to the space engineering sector

This case study illustrates the application of the Value Creation Radar (VCR) to SenSyF, an Earth Observation (EO) system which was developed by Deimos Engenharia S.A. (DME), the Portuguese affiliate of Elecnor Deimos. It describes how a team of consultants adopted the VCR in order to find new market applications for SenSyF, selected the one with the highest potential, and defined a path to guarantee a sustainable market launch. This case study highlights the main challenges of bringing a technology-driven company closer to the market in the pursuit of long-term sustainability, while not compromising its technological capabilities

Compact saloplastic membranes of natural polysaccharides for soft tissue engineering

The regeneration of soft biological tissues requires new substitutes that exhibit mechanical properties similar to the native tissue. Herein, thin saloplastic membranes with tunable physical properties are prepared by complexation of chitosan and alginate solutions containing different concentrations of sodium chloride. Polyelectrolyte complexes (PECs) are transferred to flat Petri dishes for compaction into membrane shapes by sedimentation and solvent evaporation. All membranes are resistant to degradation by lysozyme and are stable in solutions with pH values between 1 and 13. Immersing the different membranes in new doping solutions of increasing salt concentrations triggers the typical saloplastic behavior, with a high water absorption and decrease of the rigidity and ultimate tensile strength. The range of such variations is tuned by the sodium chloride amount used in the synthesis: high salt concentrations increase water uptake and tensile moduli, while decreasing the ultimate strength. Cellular assays demonstrate high proliferation rates and viability of L929 fibroblasts seeded onto the most rigid membranes. The results validate the use of saloplastic membranes as soft tissue substitutes for future biomedical applications.

Perspetivas de pais acerca da inclusão de alunos com transtornos do espectro do autismo na escola regular, da rede estadual de ensino da zona leste da cidade de Manaus - Amazonas, Brasil

Dissertação de mestrado em Educação Especial (área de especialização em Dificuldades de Aprendizagem Específicas)

A perceção dos alunos sobre a Educação Física à entrada do ensino secundário: um estudo comparativo entre o ensino regular e profissional

Relatório de estágio de mestrado em Ensino de Educação Física nos Ensinos Básico e Secundário

Mapping numbers onto space in preschool children and adults

Tese de Doutoramento em Psicologia - Especialidade em Psicologia Experimental e Ciências Cognitivas

Smart interior design of buildings and its relationship to land use

Architectural design is often associated with aesthetics and style, but it is also very important to building performance and sustainability. There are some studies associating architectural design to the choice for materials from sustainable sources, to indoor air quality, to energy efficiency and productivity. This article takes a step further to analyse how the use of efficient interior design techniques can impact the habitable space in order to improve building sustainability in land use. Smart interior design, a current trend related to the use of efficient and flexible furniture and movable walls in tiny or compact apartments, is analysed. A building with a standard design is used as a case study reference building and compared to a proposed theoretical design alternative using smart interior design techniques. In order to correctly assess sustainability performance, a quantifiable and verified method is used. Results showed that the use of smart interior design techniques can greatly reduce buildingsâ impact on the environment.

A qualidade de vida da pessoa com doença renal crónica em programa regular de hemodiálise

Dissertação de mestrado em Enfermagem

Inclusão de alunos com necessidades educativas especiais na escola regular: perceções de professores do ensino primário na Região Académica IV - Angola

Dissertação de mestrado em Educação Especial (área de especialização em Dificuldades de Aprendizagem Específicas)

O planeamento civil de emergência no novo paradigma da segurança

Dissertação de Mestrado em Estratégia

Desarrollo de tableros aglomerados compactos de cáscara de maní. Peanuts husks compact board development

El presente proyecto de investigación solicitado es continuacion de una línea de trabajo con insumos de desecho agroindustrial regional en la provincia de Cordoba. Prevé aportes que contribuyan a la sustentabilidad económica y social, y ambiental. Se trata de aportar valor agregado a importantes cantidades residuales de cascaras de mani. Además promueve la produccion de materiales y componentes de construcción de viviendas saludables y accesibles para sectores con necesidades sociohabitacionales.El deshecho de cáscara de maní constituye hoy en la provincia de Córdoba, un recurso sobre abundante no aprovechado en la escala en que se dispone. Existen desarrollos para su aprovechamiento - camadas de aves, alimento de ganado, carbon activado- , que no alcanzan a consumir las enormes cantidades de cascaras que se disponen hoy: alrededor de 250 000 Tn/ año. (La produccion anual de mani en caja en la provincia de Cordoba es estimada en 700.000 Tn/año)A partir de los resultados ya obtenidos con paneles livianos termoaislantes, utilizados en cielorrasos y tabiques divisorios, el nuevo trabajo de investigación y desarrollo se propone avanzar sobre las condiciones de produccion de tableros compactos, similares a los producidos comercialmente con residuos de la industria de la madera. Se estudiaran y experimentaran las propiedades de uso de resinas poliester, ureaformaldehido y fenolformaldehido, bajo condiciones de alta presion y temperatura. En la primera etapa (1º año) buscamos obtener nuevos materiales en escala de probetas.En una etapa siguiente (2º año), los nuevos materiales obtenidos serán aplicados al diseño de componentes de vivienda. Se estudiarán las posibilidades alternativas de empleo en relación a los parámetros de evaluación : peso, resistencia mecánica, aislación térmica, resistencia a la humedad, y al envejecimiento acelerado.En la última etapa (3º año) los resultados obtenidos serán aplicados en modelos de escala real y/o prototipos demostrativos para evaluar su puesta en servicio.

An investigation into the temperature distribution resulting from cutting of compact bone using a reciprocating bone saw

Surgical procedures such as osteotomy and hip replacement involve the cutting of bone with the aid of various manual and powered cutting instruments including manual and powered bone saws. The basic mechanics of bone sawing processes are consistent with most other material sawing processes such as for wood or metal. Frictional rubbing between the blade of the saw and the bone results in the generation of localised heating of the cut bone. Research studies have been carried out which consider the design of the bone saw which deals with specifics of the saw teeth geometry and research which examines the effect of drilling operations on heating of the bone has shown that elevated temperatures will occur from frictional overheating. This overheating in localised areas is known to have an impact on the rate of healing of the bone post operation and the sharpness life of the blade. The purpose of this study was to measure the temperature at three zones at fixed intervals of 3mm, 6mm, and 9mm away from the cutting zone. It should be noted that it was the first time that this measurement technique was used to measure the temperature gradient through the bone specimen thereby establishing the extent to which clinicians are experiencing thermal injury during sawing of bone while using a reciprocating saw. The effect of various cutting feed rate on temperature elevation was also investigated in this research. The results showed that there will be a region of bone at least 9mm either side of the cutting blade experiencing thermal injury as temperatures in this region exceeded the threshold temperature of 44°C for necrosis (cell death).

Acoustic emission analysis of the effect of a 2D wedge shaped blade on the compact bone cutting process

Surgeons may use a number of cutting instruments such as osteotomes and chisels to cut bone during an operative procedure. The initial loading of cortical bone during the cutting process results in the formation of microcracks in the vicinity of the cutting zone with main crack propagation to failure occuring with continued loading. When a material cracks, energy is emitted in the form of Acoustic Emission (AE) signals that spread in all directions, therefore, AE transducers can be used to monitor the occurrence and development of microcracking and crack propagation in cortical bone. In this research, number of AE signals (hits) and related parameters including amplitude, duration and absolute energy (abs-energy) were recorded during the indentation cutting process by a wedge blade on cortical bone specimens. The cutting force was also measured to correlate between load-displacement curves and the output from the AE sensor. The results from experiments show AE signals increase substantially during the loading just prior to fracture between 90% and 100% of maximum fracture load. Furthermore, an amplitude threshold value of 64dB (with approximate abs-energy of 1500 aJ) was established to saparate AE signals associated with microcracking (41 – 64dB) from fracture related signals (65 – 98dB). The results also demonstrated that the complete fracture event which had the highest duration value can be distinguished from other growing macrocracks which did not lead to catastrophic fracture. It was observed that the main crack initiation may be detected by capturing a high amplitude signal at a mean load value of 87% of maximum load and unsteady crack propagation may occur just prior to final fracture event at a mean load value of 96% of maximum load. The author concludes that the AE method is useful in understanding the crack initiation and fracture during the indentation cutting process.

Uso crônico e regular de estatina previne fibrilação atrial no pós-operatório de cirurgia cardíaca

FUNDAMENTO: Fibrilação atrial é uma complicação frequente no pós-operatório de cirurgia cardíaca. O uso prévio de estatinas pode reduzir a incidência dessa arritmia. OBJETIVO: Avaliar se o uso crônico e regular de estatina, por um período de seis meses, previne fibrilação atrial no pós-operatório de cirurgia cardíaca eletiva. MÉTODOS: Estudo realizado em 107 pacientes submetidos à cirurgia cardíaca, 66% do sexo masculino e com idade média de 60,4 anos (25 a 84). Avaliou-se a presença de fibrilação atrial entre os pacientes que usavam ou não estatina de forma regular no pré-operatório. Foram excluídos pacientes com cirurgia cardíaca de urgência, insuficiência renal, doenças inflamatórias, fibrilação atrial prévia, portadores de tireoidopatia e aqueles em uso de marca-passo definitivo. RESULTADOS: No período pós-operatório, fibrilação atrial esteve presente em 42 pacientes (39%) da amostra, sendo 11 (26%) em uso regular de estatina no período pré-operatório e 31 (74%) não. Observou-se que, em 22% do total de pacientes em uso de estatina, não houve desenvolvimento de fibrilação atrial, enquanto 45% dos que não usavam estatina apresentaram arritmia (ρ=0,02). Na revascularização miocárdica isolada, 47% dos pacientes que não usavam estatina e 23% dos que usavam desenvolveram fibrilação atrial (ρ =0,02). Não houve diferença estatística significativa na análise dos grupos com ou sem estatina quanto à presença dos fatores de risco para desenvolvimento de fibrilação atrial ( ρ=0,34). CONCLUSÃO: O uso regular de estatina, por seis meses ou mais no período pré-operatório, reduziu a incidência de fibrilação atrial no pós-operatório de cirurgia cardíaca eletiva.

Impact of Light Salt Substitution for Regular Salt on Blood Pressure of Hypertensive Patients

Background: Studies have shown sodium restriction to have a beneficial effect on blood pressure (BP) of hypertensive patients. Objective: To evaluate the impact of light salt substitution for regular salt on BP of hypertensive patients. Methods: Uncontrolled hypertensive patients of both sexes, 20 to 65 years-old, on stable doses of antihypertensive drugs were randomized into Intervention Group (IG - receiving light salt) and Control Group (CG - receiving regular salt). Systolic BP (SBP) and diastolic BP (DBP) were analyzed by using casual BP measurements and Home Blood Pressure Monitoring (HBPM), and sodium and potassium excretion was assessed on 24-hour urine samples. The patients received 3 g of salt for daily consumption for 4 weeks. Results: The study evaluated 35 patients (65.7% women), 19 allocated to the IG and 16 to the CG. The mean age was 55.5 ± 7.4 years. Most participants had completed the Brazilian middle school (up to the 8th grade; n = 28; 80.0%), had a family income of up to US$ 600 (n = 17; 48.6%) and practiced regular physical activity (n = 19; 54.3%). Two patients (5.7%) were smokers and 40.0% consumed alcohol regularly (n = 14). The IG showed a significant reduction in both SBP and DBP on the casual measurements and HBPM (p < 0.05) and in sodium excretion (p = 0.016). The CG showed a significant reduction only in casual SBP (p = 0.032). Conclusions: The light salt substitution for regular salt significantly reduced BP of hypertensive patients.