Piezoelectric actuators for bone mechanical stimulation: exploring the concept.

Arthroplasty is liable to cause intense changes on strain levels and distribution in the boné surrounding the implant, namely stress shielding. Several solutions have been proposed for this, namely design variations and development of controlled-stiffness implants. A new approach to this problem, with potential application to other orthopaedic problems and other medical fields, would be the development of smart implants integrating systems for bone mechanical stimulation. Ideally, the implant should presente sensing capability and the ability to maintain physiological levels of strain at the implant interface. Piezoelectric materials’ huge potential as a mean to produce direct mechanical stimulation lies on the possibility of producing stimuli at a high range of frequencies and in multiple combinations. The present in vitro and preliminary in vivo studies were a first step towards the validation of the concept

Vortex-Antivortex Lattice in Ultra-Cold Fermi Gases

We discuss ultra-cold Fermi gases in two dimensions, which could be realized in a strongly confining one-dimensional optical lattice. We obtain the temperature versus effective interaction phase diagram for an s-wave superfluid and show that, below a certain critical temperature T_c, spontaneous vortex-antivortex pairs appear for all coupling strengths. In addition, we show that the evolution from weak to strong coupling is smooth, and that the system forms a square vortex-antivortex lattice at a lower critical temperature T_M.Comment: Submitted to Physical Review Letter

Bone mechanical stimulation with piezoelectric materials

This chapter summarized explores in vivo use of a piezoelectric polymer for bone mechanical stimulatio

Blockchain and other innovations in entrepreneurial finance: implications for future policy

More than a decade after the Global Financial Crisis (GFC) of 2007–08, entrepreneurial finance has exhibited enormous changes, notably in the rise of alternative nonbank financing. This has been most acutely experienced in the provision and delivery of early stage and innovative business finance—the focus of this special issue. The ensuing innovations in entrepreneurial finance have taken place in developed and developing economies, presenting considerable challenges to policymakers. This editorial paper reviews the special issue articles on this subject and their implications for future research, practice and policy

Keratin peptides from chicken feathers for biomedical applications

Book of Abstracts of CEB Annual Meeting 2017info:eu-repo/semantics/publishedVersio

Manipueira: um adubo orgânico para a agricultura familiar.

Edição dos Anais do XIII Congresso Brasileiro de Mandioca; VII Workshop sobre Tecnologia em Agroindústrias de Tuberosas Tropicais, Botucatu, 2009. Disponível também on-line

Avaliação de sistemas de manejo para pimenta de cheiro (Capsicum chinense, Jacquin) para agricultura familiar.

O experimento foi conduzido na área experimental da Embrapa Amazônia Oriental, em Belém, PA, com o objetivo de avaliar sistemas de manejo para a pimenta de cheiro, em latossolo amarelo, textura média

Editorial entrepreneurial finance for green innovative SMEs

The Autumn 2022 COP27 Conference of the Parties of the United Nations Framework Convention on Climate Change demonstrated that the need for a clear research and policy agenda to assist the financing of early stage Cleantech and green SMEs innovation and green practice adoption has never been greater. Green, cleantech innovators hold important keys to unlocking vital globally game changing technologies that can scale-up to mitigate climate change and humanity’s wider environmental damage to ensure planetary sustainability. The paper provides a contemporary overview of the financing issues facing green SME innovators and adopters by reviewing seven papers published in this IEEE Transactions on Engineering Management Special Issue on green entrepreneurial finance. The papers provide deep insights into SMEs’ external financing requirements, barriers to private finance and the shortcomings of public tax and financing policies. This editorial paper concludes with a series of key recommendations for researchers, SME finance practitioners and public policymakers which provide guidance for more holistic policies to deliver longer horizon patient capital investing and facilitate green innovation commercialization, scale-up and adoption for a sustainable plane

Characterization of acerola byproduct flour during storage in different packaging.

Considering the nutritional richness, the presence of bioactive compounds and the potential for the processing and utilization of acerola by-products, the objective was to evaluate the physico-chemical transformations that occur during the storage of a flour obtained from the industrial byproduct of acerola in different types of packaging.The flour was produced by drying the by-product in an oven with air circulation at 65 ° C, crushed, sieved (16 mesh) and stored for up to 180 days in the following packages: vacuum bag (VAC), ethylene polytetraphthalate PET), polystyrene (PLT) pots and polypropylene (PP) pots and analyzed every 45 days.The parameters of pH, moisture, water activity (Aqualab), acidity in citric acid, glucose reducing sugars, color (L* Chroma and Hue), ascorbic acid (Tillmans method), anthocyanins, flavonoids, total phenols (Folin-Ciocalteau) and antioxidant potential (DPPH) were determined, whose results at time 0 were 3.56; 10.55 g 100g; 0.39; 5.36 g 100g-1; 24.63 g 100g-1; 36.60; 26.85; 63.76; 964.80 mg 100g-1; 15.66 mg 100g-1; 149.30 mg 100g-1; 1319.55 mg 100g- 1; 252.40 μg mL-1 (EC-50), respectively. There was significant interaction for storage period x packaging in most variables except pH, potential antioxidants and Chroma that were influenced only by storage time. In general, most of the packaging treatments presented a linear and gradual increase of humidity (66.16%) and a gradual and linear decrease in the values of L* (-4.78%) and sugar content in glucose (-11.73%) and anthocyanins (-39.85%) at the end of storage, however, these effects were generally reduced in vacuum packaging, since this packaging provides a physical barrier between product and environment, reducing the exchange of gases and vapors between the two environments, allowing the reduction of enzyme activity and oxidation of the substrate.Resumo 112414