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5,579 Matching Results
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Efficiency of Ozone Production in the Houston Plume
Ozone levels observed during a field campaign in Houston were significantly higher than that observed in Phoenix or Philadelphia. An examination of the slope of O{sub x} versus NO{sub z} in the urban plumes shows that NO{sub x} is used 2 to 3 times more efficiently in Houston as compared with Phoenix and Philadelphia. Representative values of OPEx are 7-12, 3, and 4, in Houston, Phoenix, and Philadelphia. Aircraft observations have been used to calculate P(O{sub 3})/P(NO{sub z}). Values in Houston are significantly higher than in Phoenix and Philadelphia. We show that P(O{sub 3})/P(NO{sub z}) is proportional to a VOC/NO{sub 2}-OH reactivity ratio. High values of P(O{sub 3})/P(NO{sub z}) in Houston are due to emissions of reactive olefins from the ship channel region. It is significant that high values of P(O{sub 3})/P(NO{sub z}) occur at NO{sub x} levels up to several 10's of ppb. Not only is the chemistry efficient but it will be long lasting. The occurrence of high NO{sub x} and high OPEx is fostered by the co-location of VOC and NO{sub x} sources in the Houston industrial areas.
Date:
October 1, 2001
Creator:
Kleinman, L. I.; Daum, P. H.; Brechtel, F.; Lee, Y. N.; Nunnermacker, L. J.; Springston, S. R. et al.
System:
The UNT Digital Library
[Society Section: Houston Chronicle]
Articles in the Society section of Houston Chronicle containing information about various events in the Houston, Texas area.
Date:
March 13, 2006
Creator:
Hodge, Shelby
System:
The UNT Digital Library
Houston's Politics and the Cherokees, 1829-1833
Article chronicles Sam Houston's attempts to lobby Congress for better rations and resources for the Cherokee people after their relocation during President Andrew Jackson's administration. Houston was a long time friend of the tribe and was angered by the conditions in which they lived during this time.
Date:
Winter 1968
Creator:
Jones, Robert L. & Jones, Pauline H.
System:
The Gateway to Oklahoma History
[Houston Business Journal, 2003-12-29]
Article about the launching of ESPREE Magazine in Lincolnshire, Illinois and Brilliant Magazine in Austin, Texas.
Date:
December 29, 2003
Creator:
Houston Business Journal
System:
The UNT Digital Library
Observations of Recent New Particle Formation in Houston During TEXAQS-2000
Particle number size distribution measurements were conducted at a tall building site and on a research aircraft during the TexAQS-2000 study. High concentrations of nucleation mode particles were observed during the early morning hours at the same time as the top of the developing boundary layer reached the sampling altitude. Transport of primary emissions from traffic and other local sources, as well as secondary formation processes, was observed. Growth of particles from the nucleation to Aitken modes appears to significantly impact the observed diurnal variation in the number size distribution. As these particles grow to larger sizes they may become more effective at scattering radiation and could act as cloud condensation nuclei, resulting in visibility and climate effects.
Date:
October 1, 2001
Creator:
Buzorius, G.; Brechtel, F.; Zelenyuk, A.; Imre, D. & Angevine, W. M.
System:
The UNT Digital Library
Some New Light on Houston's Life Among the Cherokee Indians
Article chronicles the interactions between Sam Houston and the Cherokee tribes. This information was gathered from the author's collection of manuscripts written by the famous general.
Date:
Summer 1931
Creator:
Foreman, Grant
System:
The Gateway to Oklahoma History
New Light on an Old Enigma: Sam Houston and the Grand Saline
Article attempts to chronicle how Sam Houston acquired the Grand Saline, land originally held by Auguste Pierre Chouteau within Arkansas Territory.
Date:
Autumn 1973
Creator:
Hall, Kermit L.
System:
The Gateway to Oklahoma History
The Oklahoma National Guard on the Mexican Border, 1916
Article illustrates the conflict that arose when raids on the Mexican border spurred the Oklahoma National Guard into action and preceded joint training by the Army and the National Guard.
Date:
Winter 1975
Creator:
Houston, Donald E.
System:
The Gateway to Oklahoma History
George Clooney spotted in Sugar Land for Apollo 13 anniversary
Article about the Apollo 13 45th anniversary celebration hosted by Omega in Sugar Land, Texas.
Date:
2015-05-22/2015-05-28
Creator:
Houston Business Journal
System:
The UNT Digital Library
The effect of stress on the nanomechanical properties of Au surfaces
Stress in thin films plays a critical role in many technologically important areas. The role is a beneficial one in strained layer superlattices where semiconductor electrical and optical properties can be tailored with film stress. On the negative side, residual stress in thin-film interconnects in microelectronics can lead to cracking and delamination. In spite of their importance, however, surface and thin-film stresses are difficult to measure and control, especially on a local level. In recent studies, we used the Interfacial Force Microscope (IFM) in a nanoindenter mode to survey the nanomechanical properties of Au films grown on various substrates. Quantitative tabulations of the indentation modulus and the maximum shear stress at the plastic threshold showed consistent values over individual samples but a wide variation from substrate to substrate. These values were compared with film properties such as surface roughness, average grain size and interfacial adhesion and no correlation was found. However, in a subsequent analysis of the results, we found consistencies which support the integrity of the data and point to the fact that the results are sensitive to some property of the various film/substrate combinations. In recent measurements on two of the original substrate materials we found a direct …
Date:
December 31, 1996
Creator:
Houston, J.E.
System:
The UNT Digital Library
Adhesion and nanomechanical studies by interfacial force microscopy
The capabilities of Interfacial Force Microscopy (IFM) are illustrated utilizing the following examples: the bonding interaction between chemically distinct end groups on self-assembling molecules adsorbed on the sample and and probe tip; and a study of the effect of morphological defects on the nanomechanical properties of gold single crystal surfaces.
Date:
May 1, 1997
Creator:
Houston, J.E.
System:
The UNT Digital Library
What is a pipeline? Chief Morrison cracks down on shyster lawyers and informants
Article explaining the meaning of pipeline to refer to the Houston Police Department referring people to a select handful of lawyers and expressing the hope that the Houston Bar Association will put a stop to this practice.
Date:
unknown
Creator:
unknown
System:
The Portal to Texas History
What is a pipeline? Chief Morrison cracks down on shyster lawyers and informants
Article explaining the meaning of pipeline to refer to the Houston Police Department referring people to a select handful of lawyers and expressing the hope that the Houston Bar Association will put a stop to this practice.
Date:
unknown
Creator:
unknown
System:
The Portal to Texas History
Houston's Most Handsome Men Strut the Runway For a Vital Women's Cause
Article about the 20th "Una Notte in Italia" event held in Houston, Texas.
Date:
November 6, 2018
Creator:
Hodge, Shelby
System:
The UNT Digital Library
Diana, Tiana, or Talihina? The Myth and Mystery of Sam Houston's Cherokee Wife
Article examines the identity of Sam Houston's part-Cherokee wife, who has been attributed several different names in historical documentation related to her existence. Stan Hoig investigates the women who might have possibly been confused with Diana, Tiana, or Talahina Houston, as well as how this confusion left its mark on a grave.
Date:
Summer 1986
Creator:
Hoig, Stan
System:
The Gateway to Oklahoma History
[Draft of article by John J. Herrrera, "My 17 Minutes with John F. Kennedy", Houston Chronicle - 1983-11-21]
Draft of an article by John J. Herrera published in the Houston Chronicle on November 21, 1983. The article, titled "My 17 Minutes with John F. Kennedy", recounts Kennedy's trip to Houston and the brief time Herrera was able to spend with him. It also describes how Herrera and his family heard the news of Kennedy's assassination the following day.
Date:
November 21, 1983
Creator:
Herrera, John J.
System:
The Portal to Texas History
Houston's Premier Party Diva Lands a Special Toast to Her Philanthropic Efforts Across the Globe
Article about a party held to celebrate Becca Cason Thrash's fundraising efforts.
Date:
December 6, 2017
Creator:
Hodge, Shelby
System:
The UNT Digital Library
Natural Radiation Environment II. Volume II. Proceedings of the Second International Symposium, August 7--11, 1972, Houston, Texas
None
Date:
January 1, 1972
Creator:
Adams, J. A. S.; Lowder, W. M. & Gesell, T. F., (eds.)
System:
The UNT Digital Library
[Printout of Dallas Voice article: Houston appeals court rules sodomy statute violates state's constitution]
Printout of Dallas Voice article concerning the Houston appeals court ruling that sodomy statute violates the Texas state constitution.
Date:
June 9, 2000
Creator:
unknown
System:
The UNT Digital Library
Structures of adsorbed CO on atomically smooth and on stepped sngle crystal surfaces
The structures of molecular CO adsorbed on atomically smooth surfaces and on surfaces containing monatomic steps have been studied using the electron stimulated desorption ion angular distribution (ESDIAD) method. For CO adsorbed on the close packed Ru(001) and W(110) surfaces, the dominant bonding mode is via the carbon atom, with the CO molecular axis perpendicular to the plane of the surface. For CO on atomicaly rough Pd(210), and for CO adsorbed at step sites on four different surfaces vicinal to W(110), the axis of the molecule is tilted or inclined away from the normal to the surface. The ESDIAD method, in which ion desorption angles are related to surface bond angles, provides a direct determination of the structures of adsorbed molecules and molecular complexes on surfaces.
Date:
January 1, 1980
Creator:
Madey, T.E. & Houston, J.E.
System:
The UNT Digital Library
Contact Hysteresis and Friction of Alkanethiol SAMs on Au
Nanoindentation has been combhed with nanometer-scale friction measurements to identi~ dissipative mechanisms responsible for friction in hexadecanethiol self-assembled monolayer on Au. We have demonstrated that friction is primarily due to viscoelastic relaxations within the films, which give rise to contact hysteresis when deformation rates are within the ranges of 5 and 200 k. We observe that this contact hysteresis increases with exposure to air such that the friction coefficient increases from 0.004 to 0.075 when films are exposed to air for 40 days. Both hysteresis and friction increase with probe speed, and we present a model of friction that characterizes this speed dependence and which also predicts a linear dependence of friction on normal force in thin organic films. Finally, we identify several short-term wear regimes and identify that wear changes dramatically when fdms age.
Date:
October 14, 1998
Creator:
Houston, J. E. & Kiely, J. D.
System:
The UNT Digital Library
Wafer level thin-film solder bonding of a hybrid sensor for interfacial force microscopy
We discuss the design, fabrication, and performance of a hybrid force sensor for Interfacial Force Microscopy which features a new wafer-level, thin-film soldering technique.
Date:
December 31, 1996
Creator:
Matzke, C.M. & Houston, J.E.
System:
The UNT Digital Library
Interphase mechanical properties in epoxy-glass fiber composites as measured by interfacial force microscopy
The research focuses on the measurement of the nanomechanical properties associated with the interphase region of a polymer matrix fiber composite with a nanometer resolution in chemically characterized model composites. The Interfacial Force Microscope (IFM) is employed to measure, with nanometer resolution, the mechanical properties of the interphase region of epoxy/glass fiber composites. The chemistry of the interphase is altered by the adsorption on to the fiber surface a coupling agent, 3-aminopropyltrimethoxy silane ({gamma}-APS) which is known to covalently bond to the glass fiber surface and the epoxy resin. Recent work utilizing FT-IR fiber optic evanescent wave spectroscopy provides a method for the characterization of the interphase chemistry. This technique has been used to investigate the interphase chemistry of epoxy/amine curing agent/amine-terminated organosilane coupling agent/silica optical fiber model composites. This body of work has shown that a substantial fraction of the amine of the organosilane-coupling agent does not participate in a reaction with the epoxy resin. This evidence suggests an interphase that will have mechanical properties significantly different than the bulk epoxy/amine matrix. Previous research has shown that drastic changes occur in the coupling agent chemistry, interphase chemistry, and composite mechanical properties as the amount of adsorbed coupling agent is …
Date:
April 1, 1998
Creator:
Winter, R.M. & Houston, J.E.
System:
The UNT Digital Library
Separating Mechanical and Chemical Contributions to Molecular-Level Friction
The authors use force-probe microscopy to study the friction force and the adhesive interaction for molecular monolayer self-assembled on both Au probe tips and substrate surfaces. By systematically varying the chemical nature of the end groups on these monolayers the authors have, for the first time, delineated the mechanical and chemical origins of molecular-level friction. They use chemically inert {double_bond}CH{sub 3} groups on both interracial surfaces to establish the purely mechanical component of the friction and contrast the results with the findings for chemically active {double_bond}COOH end-groups. In addition, by using odd or even numbers of methylene groups in the alkyl backbones of the molecules they are able to determine the levels of inter-film and intra-film hydrogen bonding.
Date:
August 14, 2000
Creator:
KIM,HYUN I. & HOUSTON,JACK E.
System:
The UNT Digital Library