507 research outputs found
Hadley Howes, Stephen Maxwell : Negotiating Desire
No full textA small catalogue documenting a sculptural installation by Howes and Maxwell. Ritter's descriptive analysis of this collection of ambiguous objects, made by clamping layers of rubber between wood, relates subjects of motility, mimicry, intimacy and instability to issues of gender, sexuality and desire. Includes three poems by S. Wakefield, which address similar themes. 3 bibl. ref
Ernest, Hadley, and Italy
No full textBiography covering Hemingway’s courtship and marriage to first wife, Hadley Richardson, and their subsequent European travels. Donaldson discusses Hemingway’s early apprenticeship and the impact of the legendary lost manuscripts on the young author
Correspondence regarding Horace Kephart collection
No full textThis 1973 correspondence, between Congressman Roy A. Taylor, Ronald Walker, Lawrence C. Hadley, discusses the transfer of Horace Kephart collection from the library of Great Smoky Mountains National Park to Western Carolina University. Horace Kephart (1862-1931) was a noted naturalist, woodsman, journalist, and author and promoter of the Great Smoky Mountains National Park
The dynamics of Hadley circulation variability and change
No full text2017 Summer.Includes bibliographical references.The Hadley circulation exerts a dominant control on the surface climate of earth's tropical belt. Its converging surface winds fuel the tropical rains, while subsidence in the subtropics dries and stabilizes the atmosphere, creating deserts on land and stratocumulus decks over the oceans. Because of the strong meridional gradients in temperature and precipitation in the subtropics, any shift in the Hadley circulation edge could project as major changes in surface climate. While climate model simulations predict an expansion of the Hadley cells in response to greenhouse gas forcings, the mechanisms remain elusive. An analysis of the climatology, variability, and response of the Hadley circulation to radiative forcings in climate models and reanalyses illuminates the broader landscape in which Hadley cell expansion is realized. The expansion is a fundamental response of the atmosphere to increasing greenhouse gas concentrations as it scales with other key climate system changes, including polar amplification, increasing static stability, stratospheric cooling, and increasing global-mean surface temperatures. Multiple measures of the Hadley circulation edge latitudes co-vary with the latitudes of the eddy-driven jets on all timescales, and both exhibit a robust poleward shift in response to forcings. Further, across models there is a robust coupling between the eddy-driving on the Hadley cells and their width. On the other hand, the subtropical jet and tropopause break latitudes, two common observational proxies for the tropical belt edges, lack a strong statistical relationship with the Hadley cell edges and have no coherent response to forcings. This undermines theories for the Hadley cell width predicated on angular momentum conservation and calls for a new framework for understanding Hadley cell expansion. A numerical framework is developed within an idealized general circulation model to isolate the mean flow and eddy responses of the global atmosphere to radiative forcings. It is found that it is primarily the eddy response to greenhouse-gas-like forcings that causes Hadley cell expansion. However, the mean flow changes in the Hadley circulation itself crucially mediate this eddy response such that the full response comes about due to eddy-mean flow interactions. A theoretical scaling for the Hadley cell width based on moist static energy is developed to provide an improved framework to understand climate change responses of the general circulation. The scaling predicts that expansion is driven by increases in the surface latent heat flux and the width of the rising branch of the circulation and opposed by increases in tropospheric radiative cooling. A reduction in subtropical moist static energy flux divergence by the eddies is key, as it tilts the energetic balance in favor of expansion
Observed poleward expansion of the Hadley circulation since 1979
No full textUsing three meteorological reanalyses and three outgoing long-wave radiation (OLR) datasets, we show that the Hadley circulation has a significant expansion of about 2 to 4.5 degrees of latitude since 1979. The three reanalyses all indicate that the poleward expansion of the Hadley circulation in each hemisphere occurs during its summer and fall seasons. Results from the OLR datasets do not have such seasonality. The expansion of the Hadley circulation implies a poleward expansion of the band of subtropical subsidence, leading to enhanced mid-latitude tropospheric warming and poleward shifts of the subtropical dry zone. This would contribute to an increased frequency of midlatitude droughts in both hemispheres
Changes in the strength and width of the Hadley Circulation since 1871
No full textRecent studies demonstrate that the Hadley Circulation has intensified and expanded for the past three decades, which has important implications for subtropical societies and may lead to profound changes in global climate. However, the robustness of this intensification and expansion that should be considered when interpreting long-term changes of the Hadley Circulation is still a matter of debate. It also remains largely unknown how the Hadley Circulation has evolved over longer periods. Here, we present long-term variability of the Hadley Circulation using the 20th Century Reanalysis. It shows a slight strengthening and widening of the Hadley Circulation since the late 1970s, which is not inconsistent with recent assessments. However, over centennial timescales (1871–2008), the Hadley Circulation shows a tendency towards a more intense and narrower state. More importantly, the width of the Hadley Circulation might have not yet completed a life-cycle since 1871. The strength and width of the Hadley Circulation during the late 19th to early 20th century show strong natural variability, exceeding variability that coincides with global warming in recent decades. These findings raise the question of whether the recent change in the Hadley Circulation is primarily attributed to greenhouse warming or to a long-period oscillation of the Hadley Circulation – substantially longer than that observed in previous studies
Bulletin of the Massachusetts Archaeological Society, Vol. 3, No. 4
No full textWinslow’s Reports of the Indians (Charles F. Sherman) The Vinland Voyage – 1941 (Douglas S. Byers) Camp Sites near Plymouth, Mass. (Jesse Brewer) A Trading Center for Local Products in the Town of Hadley, Massachusetts (William J. Howes
Single-electron switching on chips: The nanoscale circuit has become reality
No full textVery little distinguishes the first transistor presented by Bell Telephone Labs researchers Bardeen, Shockley, and Brattain in 1947 from the Single Electron Transistor (set) developed by tu delft physicist Pieter Heij. The set,which switches using single electrons, can only be observed with the aid of an electron microscope. Over the past four years, Heij has worked at the Quantum Transport group of professor Dr. Ir. Hans Mooij and Dr. Peter Hadley to develop techniques for joining sets into larger units that can be used for logical operations. This involved the extremely accurate positioning of successive layers of atoms, some of which were only just thick enough to enable electrons to tunnel through. The current models still require extremely low temperatures to work
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