• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1850
  • 497
  • 213
  • 163
  • 135
  • 97
  • 42
  • 42
  • 42
  • 42
  • 42
  • 41
  • 37
  • 32
  • 25
  • Tagged with
  • 3736
  • 2240
  • 715
  • 407
  • 401
  • 302
  • 294
  • 256
  • 252
  • 237
  • 213
  • 208
  • 205
  • 202
  • 193
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
61

An investigation of electric-double-layer concepts and colloidal stability of titanium dioxide dispersions.

Webb, Joseph T. 01 1900 (has links)
No description available.
62

Economic and technical study of carbon dioxide reduction technologies

Goodman, Joseph 27 October 2006 (has links)
In a carbon-constrained economy, the decision making process for selecting carbon reducing technologies for existing single power plants, portfolios of power plants, or new power plant technologies must incorporate the monetary impact of reducing CO2 emissions. Cost of electricity and the monetary impacts of reducing criteria pollutants primarily drive power plant decisions. For example, a gas turbine power plant may upgrade its combustion system to a Dry Low NOx combustor if regulations require or provide incentives for reduced NOx emissions. Similarly, in a carbon-constrained economy, the CO2 emissions strategy selected may impact the operating profile and or equipment of the power plant. Given the wide array of CO2 mitigation strategies available for power plants, robust guidelines are needed to consistently compare varying strategies. The purpose of this study is to provide guidelines for comparing currently available and near-term CO2 mitigation strategies, while also providing guidelines for comparing new low CO2 emission technologies. Furthermore, the issue of making a decision for a portfolio of power plants versus a single plant will be explored along with fuel price sensitivity and CO2 credit trading.
63

Kinetics of photocatalytic degradation using titanium dioxide films

Chin, Paul. January 1900 (has links)
Thesis (Ph.D.)--North Carolina State University, 2008. / Adviser: Ollis, David F. Includes bibliographical references.
64

Chlorine dioxide photochemistry in solution : time-resolved resonance Raman and femtosecond pump-probe studies /

Hayes, Sophia Charalambous. January 2001 (has links)
Thesis (Ph. D.)--University of Washington, 2001. / Vita. Includes bibliographical references (leaves 155-163).
65

Encapsulation of inorganic particles via miniemulsification and film formation of resulting composite latex particles /

Al-Ghamdi, Ghurmallah H. January 2003 (has links)
Thesis (Ph. D.)--Lehigh University, 2003. / Includes bibliographical references and vita.
66

Generation of a novel TiO 2 - composite a feasibility study /

Lindstrom, Mathias E. V. January 2002 (has links)
Thesis (M.S.)--Miami University, Dept. of Paper Science and Engineering, 2002. / Title from first page of PDF document. Document formatted into pages; contains vii, 107 p. : ill. Includes bibliographical references (p. 73-75).
67

Some thermodynamic properties of air and of carbon dioxide

Worthing, Archie G. January 1911 (has links)
Thesis (Ph. D.)--University of Michigan, 1911. / "Reprinted from the Physical review, vol. XXXIII, no. 4, October, 1911."
68

Discovery of a biochemical pathway to generate ribulose 1,5-bisphosphate and subsequent CO2 fixation through ribulose carboxylase/oxygenase (rubisCO) in Methanococcus jannaschii

Finn, Michael W., January 2004 (has links)
Thesis (Ph. D.)--Ohio State University, 2004. / Title from first page of PDF file. Document formatted into pages; contains xiii, 149 p.; also includes graphics. Includes abstract and vita. Advisor: F. Robert Tabita, Dept. of Microbiology. Includes bibliographical references (p. 144-149).
69

Airshed-based statistical modeling of the spatial distribution of air pollution the case of sulfur dioxide /

Shen, Kang-Ping. January 2004 (has links)
Thesis (Ph. D.)--Ohio State University, 2004. / Title from first page of PDF file. Document formatted into pages; contains x, 200 p.; also includes graphics (some col.). Includes abstract and vita. Advisor: Jean-Michel Guldmann, Dept. of City and Regional Planning. Includes bibliographical references (p. 135-139).
70

Modeling of carbon dioxide absorption/stripping by aqueous methyldiethanolamine/piperazine

Frailie, Peter Thompson, II 03 July 2014 (has links)
Rigorous thermodynamic and kinetic models were developed in Aspen Plus® Rate SepTM for 8 m PZ, 5 m PZ, 7 m MDEA/2 m PZ, and 5 m MDEA/5 m PZ. Thermodynamic data was regressed using a sequential regression methodology, and incorporated data for all amine, amine/water, and amine/water/CO₂ systems. The sensitivity of CO₂ absorption rate was determined in a wetted wall column simulation in Aspen Plus®, and the results were used in Microsoft Excel to determine the optimum reaction rates, activation energies, and binary diffusivities. Density, viscosity, and binary diffusivity are calculated using user-supplied FORTRAN subroutines rather than built-in Aspen Plus® correlations. Three absorber configurations were tested: adiabatic, in-and-out intercooling, and pump-around intercooling. The two intercooled configurations demonstrated comparable improvement in capacity and packing area, with the greatest improvement in 8 m PZ occurring between lean loadings of 0.20 and 0.25 mol CO₂/mol alkalinity. The effects of absorber temperature and CO₂ removal were tested in the adiabatic and in-and-out intercooled configurations. For 7 m MDEA/2 m PZ at a lean loading of 0.13 mol CO₂/mol alkalinity reducing the absorber temperature from 40 °C to 20 °C increases capacity by 64% without an appreciable increase in packing area. Increasing CO₂ removal from 90% to 99% does not double the packing area due to favorable reaction rates at the lean end of the absorber. Two stripper configurations were tested: the simple stripper and the advanced flash stripper. For all amines, absorber configurations, and lean loadings the advanced flash stripper demonstrated the better energy performance, with the greatest benefit occurring at low lean loadings. An economic estimation method was developed that converts purchased equipment cost and equivalent work to $/MT CO₂. The method is based on economic factors proposed by DOE-NETL and IEAGHG. The total cost of CO₂ decreases as lean loading decreases for all amines and configurations. Increasing CO₂ removal from 90% to 99% results in a 1% increase in the total cost of CO₂ capture. Decreasing absorber temperature for 7 m MDEA/2 m PZ from 40 °C to 20 °C decreases total cost of CO₂ capture by up to 9.3%. / text

Page generated in 0.0295 seconds