13,290 research outputs found
TURNER, Henry McNeal
No full textTitle: Papers, 1835-1916 Description: 1 linear ft.
Notes: Bishop of the African Methodist Episcopal Church. Chiefly biographical material on Turner and family members, manuscripts, documents, and correspondence related to his activities in the AME Church and as Chaplain in the US Army. Addresses, petitions, announcements, programs, memorials, newspapers, newspaper clippings, and photos. Card index in the MSRC. Gift of Charlotte Lankford, 1961.
Subjects: African Methodist Episcopal Church; Clergy; Turner, Henry McNeal Blacks; Organizations and societies Chaplains; Military; Turner, Henry McNeal Freemasons (Fraternal organization); Blacks Freemasons(Fraternal organization); Washington, DC Howard University, Washington, DC Lincoln, Abraham, 1809-1865; Statues Lincoln Park, Washington, DC Methodist churches Parks; Washington, DC Teachers and teaching; Washington, DC Turner, Edward Walter, 1850-1927 Turner family Washington, DC; Education; Teachers and teaching Washington, DC; Natural resources; Parks Washington, DC; Organizations and societies
Location: Howard University, Moorland-Spingarn Research Center (Washington, DC) NIDS Fiche #: 4.72.115 NUCMC #: MS 62-427
TURNER, Edward
No full textTitle: Papers, 1871-1926 Description: 0.5 linear ft.
Notes: Educator, government official, of Washington, DC. Correspondence, programs, reports, resolutions, memorabilia, and other papers, documenting Turner\u27s association with the Masons and Howard University; personal diaries, including accounts of expenditures and description of the unveiling ceremonies of the Lincoln statue at Lincoln Park in Washington, 1876; and newspaper clippings on selected individuals, events, institutions, and places. Gift.
Subjects: Blacks; Organizations and societies Freemasons; Turner, Edward Walter Freemasons (Fraternal organization); Blacks Freemasons (Fraternal organization); Washington, DC. Howard University; Students; Turner, Edward Walter Howard University, Washington, DC Lincoln Park, Washington, DC Lincoln, Abraham, 1809-1865; Statues Lincoln, Abraham; Monuments and memorials; Washington, DC Monuments and memorials; Lincoln, Abraham; Washington, DC Parks; Washington, DC Statues; Lincoln, Abraham Teachers and teaching; Washington, DC Washington, DC; Education; Teachers and teaching Washington, DC; Natural resources; Parks Washington, DC; Organizations and societies
Location: Howard University, Moorland-Spingarn Research Center (Washington, DC) NIDS Fiche #: 4.72.114 NUCMC #: MS 83-126
Interview transcript for John Freeland Turner
No full textMr. John Freeland Turner is owner (with his brother Harold) of the Tringle X Ranch, and third generation to grow up on the Ranch. He talks about his life on the ranch, and career(s), including his work on the ranch, his time in service for the government as a representative in Wyoming and in DC, serving in several capacity including Director of Fish and Wildlife Service
Interview audio for John Freeland Turner
No full textMr. John Freeland Turner is owner (with his brother Harold) of the Tringle X Ranch, and third generation to grow up on the Ranch. He talks about his life on the ranch, and career(s), including his work on the ranch, his time in service for the government as a representative in Wyoming and in DC, serving in several capacity including Director of Fish and Wildlife Service
douglasii
No full textSenecio flaccidus Less. var. douglasii (DC.) B. Turner & T. BarkleyBush groundsel, Bush senecio, Douglas' groundsel, Douglas' shrubby ragwort, Shrubby butterweedKing City Quadrangle. 3.5 miles E.N.E. of Wlby.Grass, Slope N 30%650 feetAstragalus leucopsis, Astragalus leucophyllusherb 1 1/2 fee
Common Mode Currents in DC Power Routers
No full textThe grid reinforcement and energy redirection needs have led to the emergence of Back-To-Back Voltage Source Converter (BTB-VSC) based dc power routers. This paper investigates the low frequency Common Mode Currents (CMCs) that arise in the system if the employed BTB-VSCs have an un-isolated ac path connected in parallel to their output ports. Simulation results are presented to show a sensitivity analysis of lower order harmonics in CMC with respect to the operating active and reactive power of the dc router, dc link voltage, link resistance, modulation method and pole capacitance. Experimental results are shared to show existance of lower order CMC in 3-wire ac link operating in parallel with the dc power router and these are mitigated using zero sequence controller
Modeling, Control, and Operation of an M-DAB DC-DC Converter for Interconnection of HVDC Grids
No full textFuture high-voltage direct-current (HVDC) networks based on voltage source converters (VSCs) will have different structures (asymmetric monopolar, bipolar, or symmetric monopolar), voltage levels, control, and protection schemes. Therefore, dc-dc converters are needed to interconnect those VSC-HVDC grids and several technical issues on their control and operational systems must be adequately addressed. A dc-dc converter based on a modular-dual active bridge (M-DAB) converter is suggested to reach a desirable interconnection of the HVDC grids and regulate power flow (PF) between them. A dynamic averaged model is proposed for the M-DAB converter and its stability is analyzed using the Lyapunov function. Moreover, a new local controller based on nonlinear control theory is proposed for the M-DAB. The new M-DAB local controller is integrated with the energy management system (EMS), by updating the PF equations, to create a complete control structure. Considering the CIGRE DCS3 HVDC test system and the studied M-DAB, static, dynamic simulation, and experimental studies are conducted and the dc-dc converter and the performance of the designed controllers and the EMS are examined and validated.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Intelligent Electrical Power Grid
douglasii
No full textSenecio flaccidus Less. var. douglasii (DC.) B. Turner & T. BarkleyBush groundsel, Bush senecio, Douglas' groundsel, Douglas' shrubby ragwort, Shrubby butterweedBaja California; 8 rd. mi. S. of La Rumorosa, 55 mi. E of Tijuanain sandy arroyo in Pinyon-Juniper forest4000 feetArgemone, Chrysothamnus, Chilopsis, Nicotiana, Bacchariscoomonrounded shrub to 2 ft tall, yellow ray
Universal design of an automatic page-turner
No full textThis thesis deals with the effectiveness of automatic page-turners as one form of assistive technology. It examines several of the existing commercially available products with a view to developing a universal system that would have the potential to satisfy both the special needs and musician sectors. It explores the current trends regarding the collection of statistical data on people with a physical disability, which is intended to identify the= present and future needs for such assistive technology devices. The project utilizes a usercentric approach to document the requirements of the end users of such a device, before conceptualising a model which would have the potential to satisfy the expanded target market. It explains in detail the development process of the working model, which employs two anthropomorphic finger-like mechanisms, both of which incorporate force feedback. These finger-mimetic components are used to separate and turn the pages of the reading material. A functional prototype was built and a report of the preliminary testing carried out, together with a fully documented illustration of the final working engineering model is included. The test results reveal that the system has shown great potential for the successful development of a more universal Automatic page turner that could satisfy both identified markets
Numerical methods and time-dependent physical models for the design and diagnostic of pulsed-dc magnetrons
No full textPulsed DC operation of magnetrons is a relatively new sputtering technique that significantly improves the properties of deposited layers. The understanding and control of phenomena taking place during pulsed DC sputtering requires new time-resolved methods of investigation.
This thesis presents a comprehensive development of new methods for magnetron design and time-resolved plasma diagnostic, based on Monte Carlo simulations and timeresolved plasma physical models derived for a pulsed DC opposed target magnetron discharge with rectangular geometry.
The numerical methods have been developed and benchmarked by the author through extensive numerical experiments. A representative set of application examples is included. The time-resolved physical models for the pulse-on and pulse-off time discharge are based on the experimental data obtained by the author, which are presented as a basis for the interpretation.
The experimental data are obtained using new time-dependent diagnostic methods combining: I-V characteristics and waveforms, time and space-resolved Optical Emission Spectroscopy (OES) and time and space-resolved Ion Energy Spectra (IBS).
The following original algorithms and new time-resolved plasma diagnostic methods arc
presented:
• Algorithm and method for Monte Carlo simulation of ion transport in the magnetron discharge, based on an original non-Runge-Kutta routine developed for calculating charged particles’ trajectories in complex, position dependent, magnetic and electric fields. The Monte Carlo simulation is used for evaluating the intensity of the pre-sheath electric field through calculations of the travel time to targets of Ar ions. The time-scale for the sputtering and selfsputtering processes is also evaluated.
A new method for time-resolved plasma diagnostic in pulsed DC discharges based on time and space-resolved OES using an acousto-optic spectrometer. The described method indicates the applicability conditions for electron temperature evaluations based on timeresolved OES. the procedure and interpretation of results. Based on time and space-resolved OES evaluations of electron temperatures, a model of the physical phenomena taking place in the pulsed DC discharge during the pulse-on time is developed.
A new method for time-resolved analysis of the Ion Energy Spectra at the substrate region in pulsed DC discharges using a mass-energy analyser. Experimental results and data analysis are presented and an original physical model for plasma behaviour during the pulse-off time is developed, explaining the mechanism for the observed increase in the ion flux and energy at substrate during pulsed DC discharges. The described model explains for the first time the above effects and allows the control of the ion flux and energy at the substrate from the choice of the pulsed DC duty cycle.
The developed plasma models and time-resolved diagnostic methods are discussed for nonferromagnetic(copper) and ferromagnetic (iron) targets and the observations are correlated in order to infer a global understanding of phenomena taking place in the pulsed DC discharge and at the substrate region
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