Now showing items 11817-11836 of 12746

• The use of air ion mobility spectrum analysis to determine air pollution ﻿

(1974)
The objective of the Investigation was to determine If air ion concentrations could be used to determine the concentrations of air pollutants. A coaxial-conical, converging channel ion mobility chamber was constructed and ...

(1949)

(1960)
• The use of computer-predicted performance in the design of a three-port H-plane waveguide circulator with central ferrite post ﻿

(1968)
An approximate evaluation procedure to predict the performance of a circulator is justified. The scattering matrix description of a circulator is developed. Based on the theory by Davies, the scattering matrix elements are ...
• The use of data topology in unsupervised clustering of high-dimensional data with self -organizing maps ﻿

(2008)
High-dimensional data is increasingly becoming common because of its rich information content that can provide comprehensive characterization of objects (patterns) in real world situations. Unsupervised clustering aims to ...
• The use of horizontal bubble columns in gas-liquid chromatography ﻿

(1967)
When a single long gas bubble flows with the surrounding liquid through a small capillary tube, its velocity exceeds the average velocity of the liquid. The phenomenon is due to the thin film of stagnant liquid surrounding ...
• The use of infrared kinetic spectroscopy to study small free radicals ﻿

(1998)
The technique of infrared kinetic spectroscopy has been used to study the reaction of the propargyl radical (C3H3) with nitric oxide (NO). The overall rate constant at the high pressure limit for the reaction was determined ...
• The use of K(nd) Rydberg atoms to investigate low-energy electron-molecule interactions ﻿

(1987)
Negative ion formation through electron transfer in collisions between K(nd) Rydberg atoms (10 $\leq$ n $\leq$ 110) and C$\sb7$F$\sb{14}$ and 1,1,1-C$\sb2$Cl$\sb3$F$\sb3$ is studied and provides a novel means to explore ...
• The use of numerical methods in systems with chemical reaction and diffusion ﻿

(1973)
In this work the application of two numerical methods to the solution of the partial differential equations of diffusion and chemical reaction is described. The following systems were considered. a) When the ends of a ...
• The use of optimization techniques in the solution of partial differential equations from science and engineering ﻿

(1996)
Optimal Control of systems governed by Partial Differential Equations is an applications-driven area of mathematics involving the formulation and solution of minimization problems. Given a physical phenomenon described by ...
• The use of plasticity theory in predicting the deformational behavior of ice and sand-ice systems ﻿

(1974)
Results of triaxial and indentation tests on ice and sand-ice samples are reported. The main parameters studied in the triaxial tests were temperature (-12 to 35°F), confining pressure (atmospheric to 4, psi), and loading ...
• The use of radioactive phosphorus in studies of chick embryo infections with vaccinia and influenza virus ﻿

(1951)
Abstract Not Available.
• The use of redox measurements to study methane mitigation options in Texas rice paddies ﻿

(1996)
Redox measurements were used to study whether different mitigation options affect methane emission and production by altering the electrochemical environment in rice paddy soil. These mitigation options include field ...

(1979)
• The use of scanning laser range finders for autonomous robotic navigation ﻿

(1989)
An intelligent robotic system must possess the capabilities to sense the environment, perceive the environment, reason on the environment and then act based upon the conclusions of the reasoning process. Autonomous robotic ...
• The use of Scordatura in Heinrich Biber's Harmonia artificioso-ariosa ﻿

(1982)
Violin scordatura, the alteration of the normal g-d'-a'-e" tuning of the instrument, originated from the spirit of musical experimentation in the early seventeenth century. Closely tied to the construction and fittings of ...
• The use of shock physics to predict the mechanics of hypervelocity impact ﻿

(2000)
Shielding of spacecraft is a concern in the design of modern space vehicles. Due to unplanned spacecraft failures and naturally occurring planetary matter, the space environment is littered with orbital debris. This orbital ...
• The use of special districts in financing and facilitating urban growth ﻿

(1972)
Legal restrictions on debt limit and municipal taxing authority are almost universal in the United States. These restrictions have contributed to an inability on the part of many cities to provide basic support for the ...
• The use of spin-labelling techniques in the study of Penning ionization reaction dynamics ﻿

(1992)
The use of spin-labelling to study the dynamics of He (2 $\sp3$S) metastable atom ionization of atoms and simple molecules is described. Briefly, He (2 $\sp3$S) atoms created by a microwave discharge are spin-polarized in ...
• The use of statutory control by U.S. state legislators: One step closer to a more complete understanding of legislative control of bureaucrats ﻿

(2009)
Legislative scholars examining the use of statutory control to oversee and control bureaucrats have consistently found that the political environment influences the amount of policy-making discretion provided to bureaucrats ...