Smithsonian national museums : [Washington D.C.] /

Shows Smithsonian buildings in red and other principal Mall buildings in gray.

United States Soldiers' & Airmen's Home : [Washington D.C.].

"6 January 1988."

U.S. Capitol visitor guide : U.S. Capitol Visitor Center : [Washington D.C.].

Each map is a floorplan showing amenities of the underground visitors' center open to tourists and the public.

Reservation no. 1 : [White House grounds, Washington D.C.].

Shows buildings, plantings, and the Ellipse.

Presidents Park, Reservation no. 1 : [Washington D.C.].

Shows buildings plantings, drives, telephone and electric light cables, water pipes, hydrants, etc.

Contested Play and Clean Water: McMillan Park, Race, and the Built Environment in Washington, D.C., 1900-1941

This study focuses on the intersection of the politics and culture of open public space with race relations in the United States from 1900 to 1941. The history of McMillan Park in Washington, D.C. serves as a lens to examine these themes. Ultimately, the park’s history, as documented in newspapers, interviews, reports, and photographs, reveals how white residents attempted to protect their dominance in a racial hierarchy through the control of both the physical and cultural elements of public recreation space. White use of discrimination through seemingly neutral desires to protect health, safety, and property values, establishes a congruence with their defense of residential property. Without similar access to legal methods, African Americans acted through direct action in gaps of governmental control. Their use of this space demonstrates how African-American residents of Washington and the United States contested their race, recreation, and spatial privileges in the pre-World War II era.

"Jazz is Back": Alternative Jazz Venues and Gentrification in Washington, D.C.

Gentrification has dramatically changed the urban landscape of Washington, D.C. Non-profit alternative jazz venues have become important sites for negotiating this complex process that is re-shaping the city. Each such venue aligns itself with one of the two primary factions of gentrification: new urban migrants or long-term residents. Westminster Presbyterian Church’s Jazz Night in Southwest fosters a community of repeat-attendees resisting social displacement. The Jazz and Cultural Society unabashedly foregrounds ties to long-term residents in highlighting a black identity and its local interconnectedness. CapitolBop’s Jazz Loft demonstrates the difficulties that come with trying to cater to a young audience, and at the same time, resist gentrification. These venues present three perspectives on gentrification and together bring light to the overlapping complexity of gentrification.

PHYTOPLANKTON AND NUTRIENT DYNAMICS WITH A FOCUS ON NITROGEN FORM IN THE ANACOSTIA RIVER, IN WASHINGTON, D.C. AND WEST LAKE, IN HANGZHOU, CHINA

Nutrient loading has been linked with severe water quality impairment, ranging from hypoxia to increased frequency of harmful algal blooms (HABs), loss of fisheries, and changes in biodiversity. Waters around the globe are experiencing deleterious effects of eutrophication; however, the relative amount of nitrogen (N) and phosphorus (P) reaching these waters is not changing proportionately, with high N loads increasingly enriched in chemically-reduced N forms. Research involving two urban freshwater and nutrient enriched systems, the Anacostia River, USA, a tributary of the Potomac River feeding into the Chesapeake Bay, and West Lake, Hangzhou, Zhejiang Province, China, was conducted to assess the response of phytoplankton communities to changing N-form and N/P-ratios. Field observations involving the characterization of ambient phytoplankton communities and N-forms, as well as experimental (nutrient enrichment) manipulations were used to understand shifts in phytoplankton community composition with increasing NH4+ loads. In both locations, a >2-fold increase in ambient NH4+:NO3- ratios was followed by a shift in the phytoplankton community, with diatoms giving way to chlorophytes and cyanobacteria. Enrichment experiments mirrored this, in that samples enriched with NH4+ lead to increased abundance of chlorophytes and cyanobacteria. This work shows that in both of these systems experiencing nutrient enrichment that NH4+ supports communities dominated by more chlorophytes and cyanobacteria than other phytoplankton groups.

Fishery statistics of the United States / prepared by Data Management and Statistics Division.

1975

Senator J. William Fulbright 4.12.1974 Förenta Staternas Senat Washington D.C.

Kirje

Översten ia Alpo K. Marttinen 8.5.1973 Washington D.C.

Kirje

Documentos relativos al Congreso Postal Universal reunido en la Ciudad de Washington, D.C. el 5 de mayo de 1897

UANL

Transient and d.c. analysis of the operation mechanism of light-emitting electrochemical cells

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Transient and d.c. analysis of the operation mechanism of light-emitting electrochemical cells

Light-emitting electrochemical cells (LECs) made of electroluminescent polymers were studied by d.c. and transient current-voltage and luminance-voltage measurements to elucidate the operation mechanisms of this kind of device. The time and external voltage necessary to form electrical double layers (EDLs) at the electrode interfaces could be determined from the results. In the low-and intermediate-voltage ranges (below 1.1 V), the ionic transport and the electronic diffusion dominate the current, being the device operation better described by an electrodynamic model. For higher voltages, electrochemical doping occurs, giving rise to the formation of a p-i-n junction, according to an electrochemical doping model. Copyright (C) EPLA, 2012