Corrections to Capacitance Measurements in 2-Terminal Pair Bridges

Coaxial 2-terminal bridge comparison is a widely used metrological method in the dissemination of value of capacitance up to 1000 pF and $10^4$ rad/s. In this range, capacitance can be measured with uncertainties as small as few parts in $10^{7}$; however, such measuments must take into account the corrections due to the impedance of cables, connectors and ports, which can tipically amount up to $10^{-8}$ $\mu$F/F $-$ and maybe larger. In this work, we report on how correction factors in 2-terminal pair coaxial bridge capacitance measurements are measured and calculated at Inmetro.Comment: 3 pages, 2 figures, 2 table

Macroeducação e permacultura urbana: Análise do impacto da macroeducação em unidades familiares e a eficácia da adoção de tecnologia alternativa.

Resumo: A crescente urbanização tem acarretado grandes problemas com relação aos recursos hídricos disponíveis. A permacultura se apresenta como ferramenta socioambiental, e juntamente com os conceitos da bioconstrução servem de motivação à adoção de práticas sustentáveis numa relação de equilíbrio entre homem e natureza. A educação ambiental se propõe de forma pedagógica a estimular a formação de comunidades sustentáveis, por onde, segundo os conceitos da Macro-educação, é possível aplicar de uma forma eficaz e objetiva, o planejamento estratégico, estimulando a adoção de tecnologias sustentáveis e um uso mais consciente dos recursos naturais. Este trabalho visa sensibilizar a comunidade do bairro Jardim Santana no município de Campinas a adotar novos hábitos e atitudes ecologicamente corretos, e estimular a adoção de tecnologias alternativas como kit de captação de águas pluviais com garrafas pet, que terá como aplicação alternativa a irrigação da horta urbana, de uma unidade familiar, com o intuito de reduzir o consumo da água tratada disponibilizada pelas entidades locais. Abstract: Increasing urbanization has caused major problems in relation to the available water resources. The permaculture presents itself as a socio-environmental tool, and with the concepts of bio construction, is used as motivation for adoption of sustainable practices balancing man and nature. Environmental education is proposed as pedagogical to stimulate the sustainable communities generation, where, according to the concepts of Macro-education, it is possible to apply in an effective way and objective, the strategic planning, encouraging the adoption of sustainable Technologies and a conscious usage of the natural resources. This work aims to involve the community in Santana neighborhood in Campinas, to adopt new friendly environmental habits and attitudes and encourage adoption of alternative technologies to implement a kit of rainwater reception with pet bottles. This will be applied in irrigation of urban plantation at residential units, with the aim of reducing the cost of the treated water made available by the local authorities

Magnetosonic Waves and Current Relaxation

In this work, inertial and diffusive effects are rediscussed on the propagation of magnetosonic waves in plasmas of finite conductivity, with basis on an extension of Ohm’s law. It is shown that when such effects are strong, the discussion can be pursued by defining suitably a perturbative parameter with the dimension of speed. The results presented here are part of a program which aims to investigate the influ-ence of inertia due to charged species on the propagation of hydromagnetic waves and instabilities in re-sistive plasmas

The Reckless Mind: Intellectuals in Politics, by Mark Lilla

The reckless mind: Intellectuals in politics is a disturbing and moving book