S. E. Wood

Recent interest in the synchronous reluctance motor has increased in the context of possible applications in field oriented AC drives. The absence of rotor slip losses, and the apparent simplicity of the control, suggest the possibility of performance and cost advantages over the induction motor. With field oriented control, and continuous shaft-position feedback, the synchronous reluctance motor does not need a starting cage and can be designed for maximum saliency ratio (Ld/Lq ratio). This ratio is by far the most important parameter for achieving high power factor, torque/ampere, and constant-power speed range. This paper analyses the various known forms of the synchronous reluctance motor, to determine the maximum achievable saliency ratio and identify the parameters on which it depends. The main originality is the analysis of the effect of the number of flux guides/barriers. It is shown that a minimum number is required for the performance to surpass that of the induction motor. The analysis also reveals the optimum ratio of flux guide/flux barrier thicknesses and the effects of the tooth/slot geometry and stator saturation. Test results are included from three motors ranging from 50 W at 2000 rpm to 7.5 kW at 1500 rpm, covering both axially laminated and transversely laminated types.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsotonic Solutions. I. The Chemical Potential of Water in Aqueous Solutions of Sodium Chloride, Potassium Chloride, Sulfuric Acid, Sucrose, Urea and Glycerol at 25°1George Scatchard, W. J. Hamer, and S. E. WoodCite this: J. Am. Chem. Soc. 1938, 60, 12, 3061–3070Publication Date (Print):December 1, 1938Publication History Published online1 May 2002Published inissue 1 December 1938https://pubs.acs.org/doi/10.1021/ja01279a066https://doi.org/10.1021/ja01279a066research-articleACS PublicationsRequest reuse permissionsArticle Views2359Altmetric-Citations250LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

Phoenix Ascending The Phoenix mission landed on Mars in March 2008 with the goal of studying the ice-rich soil of the planet's northern arctic region. Phoenix included a robotic arm, with a camera attached to it, with the capacity to excavate through the soil to the ice layer beneath it, scoop up soil and water ice samples, and deliver them to a combination of other instruments—including a wet chemistry lab and a high-temperature oven combined with a mass spectrometer—for chemical and geological analysis. Using this setup, Smith et al. (p. 58 ) found a layer of ice at depths of 5 to 15 centimeters, Boynton et al. (p. 61 ) found evidence for the presence of calcium carbonate in the soil, and Hecht et al. (p. 64 ) found that most of the soluble chlorine at the surface is in the form of perchlorate. Together these results suggest that the soil at the Phoenix landing site must have suffered alteration through the action of liquid water in geologically the recent past. The analysis revealed an alkaline environment, in contrast to that found by the Mars Exploration Rovers, indicating that many different environments have existed on Mars. Phoenix also carried a lidar, an instrument that sends laser light upward into the atmosphere and detects the light scattered back by clouds and dust. An analysis of the data by Whiteway et al. (p. 68 ) showed that clouds of ice crystals that precipitated back to the surface formed on a daily basis, providing a mechanism to place ice at the surface.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVapor–Liquid Equilibrium. III. Benzene–Cyclohexane Mixtures.George. Scatchard, S. E. Wood, and J. M. MochelCite this: J. Phys. Chem. 1939, 43, 1, 119–130Publication Date (Print):January 1, 1939Publication History Published online1 May 2002Published inissue 1 January 1939https://doi.org/10.1021/j150388a009RIGHTS & PERMISSIONSArticle Views799Altmetric-Citations125LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (568 KB) Get e-Alerts

A recent study at the University of Sheffield (UK) investigates the social and economic challenges of nanotechnology. In the project, social and natural scientists worked together to provide a careful assessment of the emerging new science of nanotechnology. In addition, the role social science can play in nanotechnology's development is discussed. Nanotechnology is seen as an opportunity to investigate broader themes, such as an evaluation of the drivers behind the technology development process and how society deals with risks under uncertainty.