1,105 research outputs found
Potential and historical Uses for bracken (Pteridium aquilinum (L.) Kuhn) in organic agriculture
This report was presented at the UK Organic Research 2002 Conference. Bracken is considered a serious weed species, due to its toxic constituents and negative impacts on agriculture and conservation. Historically however, this fern was a highly prized commodity due to the many uses for cut fronds. Cutting bracken is one of the few bracken management options open to organic farmers. Many traditional uses for the material resulting from harvesting material may have potential in modern organic agriculture, putting a modern value on the plant for its sustainable use or its eradication. This poster reviews some traditional and potential uses within agriculture, investigated as part of a MPhil research project. These uses for bracken include; use as a source of fertility from raw material and ash, weed control for vegetable crops, animal bedding, cover mulch, insect repellent, seed treatment, anti-fungal agent, and biofuel
Chemical applications of escience to interfacial spectroscopy
This report is a summary of works carried out by the author between October 2003 and September 2004, in the first year of his PhD studie
Chemistry by Mobile Phone (or how to justify more time at the bar)
By combining automatic environment monitoring with Java smartphones a system has been produced for the real-time monitoring of experiments whilst away from the lab. Changes in the laboratory environment are encapsulated as simple XML messages, which are published using an MQTT compliant broker. Clients subscribe to the MQTT stream, and produce a user display. An MQTT client written for the Java MIDP platform, can be run on a smartphone with a GPRS Internet connection, freeing us from the constraints of the lab. We present an overview of the technologies used, and how these are helping chemists make the best use of their time
Detailed modelling of a large sample of Herschel sources in the Lockman Hole: identification of cold dust and of lensing candidates through their anomalous SEDs
We have studied in detail a sample of 967 SPIRE sources with 5σ detections at 350 and 500 μm and associations with Spitzer-SWIRE 24 μm galaxies in the HerMES-Lockman survey area, fitting theirmid- and far-infrared, and submillimetre, spectral energy distributions (SEDs) in an automatic search with a set of six infrared templates. For almost 300 galaxies,we havemodelled their SEDs individually to ensure the physicality of the fits. We confirm the need for the new cool and cold cirrus templates, and also of the young starburst template, introduced in earlier work. We also identify 109 lensing candidates via their anomalous SEDs and provide a set of colour–redshift constraints which allow lensing candidates to be identified from combined Herschel and Spitzer data. The picture that emerges of the submillimetre galaxy population is complex, comprising ultraluminous and hyperluminous starbursts, lower luminosity galaxies dominated by interstellar dust emission, lensed galaxies and galaxies with surprisingly cold (10–13 K) dust. 11 per cent of 500 μm selected sources are lensing candidates. 70 per cent of the unlensed sources are ultraluminous infrared galaxies and 26 per cent are hyperluminous. 34 per cent are dominated by optically thin interstellar dust (‘cirrus’) emission, but most of these are due to cooler dust than is characteristic of our Galaxy. At the highest infrared luminosities we see SEDs dominated by M82, Arp 220 and young starburst types, in roughly equal proportions
Cigarette sources for teens by grade: Implications for prevention and intervention
Objective: To identify at-risk teen populations and their sources of cigarettes, in order to help target future efforts in prevention of teen smoking. Methods: Analysis of smoking behavior questions for students in grades 6, 7, 9 and 12 from the 1997 Pennsylvania Biennial Youth Risk Survey. Results: Current smoking prevalence was 20.9% overall. The number of ninth grade smokers was almost five times higher than the number of sixth grade smokers (30.6% vs. 6.6%). Seventy-three percent of the teens identified friends as a source of tobacco. Stores became the most common source for twelfth graders only. Conclusion: Teenage smoking remains a serious public health concern and easy access to tobacco persists, despite recent legislation. The significant increase in smoking between 6th and 9th graders and the high social availability of cigarettes demonstrate the need for continued attempts to limit teen\u27s access to tobacco and emphasis on prevention efforts in younger adolescents
Computing and Diagnosing Changes in Unit Test Energy Consumption
Many developers have reason to be concerned with with power consumption. For example, mobile app developers want to minimize how much power their applications draw, while still providing useful functionality. However, developers have few tools to get feedback about changes to their application\u27s power consumption behavior as they implement an application and make changes to it over time. We present a tool that, using a team\u27s existing test cases, performs repeated measurements of energy consumption based on instructions executed, objects generated, and blocking latency, generating a distribution of energy use estimates for each test run, recording these distributions in a time series of distributions over time. Then, when these distributions change substantially, we inform the developer of this change, and offer them diagnostic information about the elements of their code potentially responsible for the change and the inputs responsible. Through this information, we believe that developers will be better enabled to relate recent changes in their code to changes in energy consumption, enabling them to better incorporate changes in software energy consumption into their software evolution decisions
- …
