A periodic microfluidic bubbling oscillator: insight into the stability of two-phase microflows

This letter describes a periodically oscillating microfoam flow. For constant input parameters, both the produced bubble volume and the flow rate vary over a factor two. We explicit the link between foam topology alternance and flow rate changes, and construct a retroaction model where bubbles still present downstream determine the volume of new bubbles, in agreement with experiment. This gives insight into the various parameters important to maintain monodispersity and at the same time shows a method to achieve controlled polydispersity.Comment: 4 page

A Survey of Clustering Analysis and Clustering Analysis in Graphs

Clustering analysis is an important topic in data mining, where data points that are similar to each other are grouped together. Graph clustering deals with clustering analysis of data points that correspond to vertices on a graph. We first survey some most well known algorithms for clustering analysis. Then for graph clustering we note that one of the fundamental factors is the distance measure between vertices. We further examine various known venues for defining such measures and propose some others

Depressed youth, suicidality and antidepressants

The document attached has been archived with permission from the editor of the Medical Journal of Australia. An external link to the publisher’s copy is included.Robert D Goldney, Peter R Mansfield, Melissa K Raven, Jon N Jureidini, Joseph M Rey, Michael J Dudley, Duncan Toplis

What Influences the Diffusion of Grassroots Innovations for Sustainability? Investigating Community Currency Niches

Community action for sustainability is a promising site of socio-technical innovation. Here we test the applicability of co-evolutionary niche theories of innovation diffusion (Strategic Niche Management, SNM) to the context of ‘grassroots innovations’. We present new empirical findings from an international study of 12 community currency niches (such as LETS, time banks, local currencies). These are parallel systems of exchange, designed to operate alongside mainstream money, meeting additional sustainability needs. Our findings confirm SNM predictions that niche-level activity correlates with diffusion success, but we highlight additional or confounding factors, and how niche theories might be adapted to better fit civil-society innovations. In so doing, we develop a model of grassroots innovation niche diffusion which builds on existing work and tailors it to this specific context. The paper concludes with a series of theoretically-informed recommendations for practitioners and policymakers to support the development and potential of grassroots innovations

Ringan Geopolimer Berbasis Lumpur Sidoarjo Dan Fly Ash Dengan Menggunakan Foam Agent

Penelitian ini membahas upaya pemanfaatan lumpur Sidoarjo untuk dapat dijadikan sebagai agregat ringan buatan melalui proses geopolimerisasi. Penelitian ini menggunakan bahan dasar lumpur Sidoarjo, fly ash, NaOH, sodium silikat, dan foam agent. Kadar sodium silikat yang digunakan sebesar 30%, 40%, 50% dan 60% dari massa pozzolan (lumpur dan fly ash) dan memperhatikan perbandingan massa larutan sodium silikat dengan larutan NaOH. Setelah itu, penelitian ini menggunakan variasi Molaritas NaOH sebesar 5M, 6M, 7M dan 8M. Untuk menghasilkan berat jenis yang lebih kecil maka ditambahkan foam agent. Perbandingan volume foam agent dengan air yang digunakan adalah 1:20 dan 1:50. Pada masing-masing penelitian tersebut diberikan variasi pemberian foam sebesar 2 liter, 3 liter, 4 liter dan 5 liter yang dikonversi menjadi perbandingan massa foam : massa binder (campuran lumpur Sidoarjo, fly ash, NaOH padat, sodium silikat dan air). Pengujian kuat tekan dilakukan pada sampel berukuran 5×5×5 cm3, sedangkan uji berat jenis, stabilitas serta absorpsi pada pelet berdiameter ± 1,5 cm. Hasil terbaik dari penelitian ini, yaitu agregat ringan geopolimer dengan berat jenis 0.82 g/cm3 dan kuat tekan sebesar 2.31 MPa pada umur 7 hari

The Affordable Care Act and implications for health care services for American Indian and Alaska Native individuals

American Indian and Alaska Native (AI/AN) populations report poor physical and mental health outcomes while tribal health providers and the Indian Health Service (IHS) operate in a climate of significant under funding. Understanding how the Patient Protection and Affordable Care Act (ACA) affects Native American tribes and the IHS is critical to addressing the improvement of the overall access, quality, and cost of health care within AI/AN communities. This paper summarizes the ACA provisions that directly and/or indirectly affect the service delivery of health care provided by tribes and the IHS

Inorganic carbon concentrating mechanisms in free-living and symbiotic dinoflagellates and chromerids

Photosynthetic dinoflagellates are ecologically and biogeochemically important in marine and freshwater environments. However, surprisingly little is known of how this group acquires inorganic carbon or how these diverse processes evolved. Consequently, how CO2 availability ultimately influences the success of dinoflagellates over space and time remains poorly resolved compared to other microalgal groups. Here we review the evidence. Photosynthetic core dinoflagellates have a Form II RuBisCO (replaced by Form IB or Form ID in derived dinoflagellates). The in vitro kinetics of the Form II RuBisCO from dinoflagellates are largely unknown, but dinoflagellates with Form II (and other) RuBisCOs have inorganic carbon concentrating mechanisms (CCMs), as indicated by in vivo internal inorganic C accumulation and affinity for external inorganic C. However, the location of the membrane(s) at which the essential active transport component(s) of the CCM occur(s) is (are) unresolved; isolation and characterization of functionally competent chloroplasts would help in this respect. Endosymbiotic Symbiodiniaceae (in Foraminifera, Acantharia, Radiolaria, Ciliata, Porifera, Acoela, Cnidaria, and Mollusca) obtain inorganic C by transport from seawater through host tissue. In corals this transport apparently provides an inorganic C concentration around the photobiont that obviates the need for photobiont CCM. This is not the case for tridacnid bivalves, medusae, or, possibly, Foraminifera. Overcoming these long-standing knowledge gaps relies on technical advances (e.g., the in vitro kinetics of Form II RuBisCO) that can functionally track the fate of inorganic C forms