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1989

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Articles 1 - 30 of 1242

Full-Text Articles in Physical Sciences and Mathematics

Application Of Microwave Technology To Effect On-Site Regeneration Of Gac, K.C. Mahesh Dec 1989

Application Of Microwave Technology To Effect On-Site Regeneration Of Gac, K.C. Mahesh

Theses

The off-site regeneration of granulated activated charcoal(GAC), spent as a result of stripping of organics from aqueous waste streams, represents a burdensome cost both because of the actual cost of regeneration and legal liability associated with shipping a hazardous waste off-site: that liability is reflected in huge potential costs associated with mishaps enroute for the self-insured or high premiums paid to the casualty insurance companies for those generators that are insured by third parties. Thus there is a need for the development of a process to effect on-site regeneration of spent GAC cost-effectively.

This thesis mainly focuses on the ...


Aqueous Absorption Of Nox Induced By Sodium Chlorite Oxidation, Chen-Lu Yang Dec 1989

Aqueous Absorption Of Nox Induced By Sodium Chlorite Oxidation, Chen-Lu Yang

Theses

Aqueous scrubbing in alkaline media for the removal of nitrogen oxides (NOx) from flue gases using NaClO2 as an oxidant is being investigated in the Chemical Engineering Department of New Jersey Institute of Technology. This thesis presents the findings of an experimental program that was conducted to estimate the capability of NaClO2 aqueous solution to oxidize insoluble NO to soluble NO2 in order to increase its solubility and thus prevent NOx emission from entering the atmosphere from flue gases emitted by municipal incinerators or power plants.

The key findings of this program are:

* NO is ...


Self-Avoiding Walks On Diluted Networks, Yigal Meir, A. Brooks Harris Dec 1989

Self-Avoiding Walks On Diluted Networks, Yigal Meir, A. Brooks Harris

Department of Physics Papers

It is shown that, contrary to recent suggestions, the exponent ν, characterizing self-avoiding walks in a diluted lattice at the percolation threshold is determined by a fixed point, different from the pure-lattice one. The full phase diagram of this system is obtained by a real-space renormalization-group treatment and five nontrivial fixed points are identified. A field-theoretical treatment yields ν=1/2+ε/42, with ε=6-d. All these results are supported by exact enumeration analysis.


Water Quality Monitoring- What Is Being Detected?, David E. Stoltenberg Dec 1989

Water Quality Monitoring- What Is Being Detected?, David E. Stoltenberg

Proceedings of the Integrated Crop Management Conference

Due to the concern over the impact of agricultural chemical use on water quality, the amount of water quality monitoring data has increased substantially during the last few years. Several groundwater surveys for nitrates and pesticides have been conducted in the Midwest. A partial list includes surveys conducted in Illinois, Kansas. Minnesota. Missouri. Nebraska. Ohio, and Wisconsin.


Pesticide Management Areas And Use Restriction In Iowa, David E. Stoltenberg Dec 1989

Pesticide Management Areas And Use Restriction In Iowa, David E. Stoltenberg

Proceedings of the Integrated Crop Management Conference

In December of 1987, the Environmental Protection Agency (EPA) released Agricultural Chemicals in Groundwater: Proposed Pesticide Strategy. The strategy is designed to ensure that the potential health and environmental impacts resulting from contamination of groundwater with pesticides are fully considered in pesticide registration decisions so that unreasonable risks can be identified and avoided. A critical component of the strategy is the prominent role that individual states can potentially have in future regulation of pesticide use. Of many individuals potentially affected by EPA's proposed strategy, few have felt any impact of the strategy on current pesticide use practices. However, since ...


Soil Tilth And Sustainable Agriculture, J. L. Hatfield Dec 1989

Soil Tilth And Sustainable Agriculture, J. L. Hatfield

Proceedings of the Integrated Crop Management Conference

Soil tilth is defined as the "physical condition of soil as related to its ease of tillage, fitness as a seedbed, and its impedance to seedling emergence and root penetration." Sustainable agriculture has been defined in Iowa as "the appropriate use of crop and livestock systems and agricultural inputs supporting those activities which maintain economic and social viability while preserving the high productivity and quality of Iowa's land." Thus, it is not possible to discuss sustainable agriculture without considering soil tilth. Development of a sustainable agricultural system requires a viable and stable soil resource, so we will explore linkages ...


Climate Changes And Impacts On Midwest Crop Production, S. Elwynn Taylor Dec 1989

Climate Changes And Impacts On Midwest Crop Production, S. Elwynn Taylor

Proceedings of the Integrated Crop Management Conference

Climate change has become a topic of worldwide concern. There are few locations where the general population has a greater vested interest in climate change than the Midwest. The economy of most Midwest communities is pr1marily dependent upon agriculture, and weather remains the primary uncontrollable factor inducing uncertainty in production. Perhaps the greatest potential effect of climate change is the influence on crops.


Dielectric Response Spectrum Of A Damped One- Dimensional Double-Well Oscillator, John W. Flocken, R. A. Guenther, John R. Hardy, L. L. Boyer Dec 1989

Dielectric Response Spectrum Of A Damped One- Dimensional Double-Well Oscillator, John W. Flocken, R. A. Guenther, John R. Hardy, L. L. Boyer

Physics Faculty Publications

The characteristic features of the dielectric response spectrum associated with the condensation of a "soft" phonon mode during a ferroelectric phase transition can be reproduced by an oscillator moving in a damped linear double-well potential. The behavior of the response function below the transition temperature T, can be simulated by introducing a linear mean-field coupling which destroys the symmetry of the well. Potentials derived from physically realistic parameters are shown to result in dielectric responses which are in order-of-magnitude agreement with experimental values.


Dielectric Response Spectrum Of A Damped One-Dimensional Double-Well Oscillator, J. W. Flocken, R. A. Guenther, John R. Hardy, L. L. Boyer Dec 1989

Dielectric Response Spectrum Of A Damped One-Dimensional Double-Well Oscillator, J. W. Flocken, R. A. Guenther, John R. Hardy, L. L. Boyer

John R. Hardy Papers

The characteristic features of the dielectric response spectrum associated with the condensation of a "soft" phonon mode during a ferroelectric phase transition can be reproduced by an oscillator moving in a damped linear double-well potential. The behavior of the response function below the transition temperature Tc can be simulated by introducing a linear mean-field coupling which destroys the symmetry of the well. Potentials derived from physically realistic parameters are shown to result in dielectric responses which are in order-of-magnitude agreement with experimental values.


Novel Metal-Film Configuration: Rh On Ag(100), P. J. Schmitz, W.-Y. Leung, G. W. Graham, Patricia A. Thiel Dec 1989

Novel Metal-Film Configuration: Rh On Ag(100), P. J. Schmitz, W.-Y. Leung, G. W. Graham, Patricia A. Thiel

Chemistry Publications

We present the results of an investigation of Rh films on Ag(100). The films are studied using Auger-electron spectroscopy, low-energy electron diffraction, x-ray photoelectron spectroscopy, ultraviolet photoemission spectroscopy, ion-scattering spectroscopy, and scanning Auger microscopy. Overlayer characteristics are examined at substrate temperatures of 300 and 600 K. We find that the equilibrium configuration is not predicted by any of the three traditional growth modes (Frank–Van der Merwe, Stranski-Krastanov, or Volmer-Weber). Rather, the equilibrium film structure is that of a Ag-Rh-Ag sandwich, most probably flat. Formation of the sandwich is thermodynamically driven by the difference in surface free energies between ...


Automated Tension Infiltrometer, Mark D. Ankeny, Thomas C. Kaspar, Robert Horton Jr. Dec 1989

Automated Tension Infiltrometer, Mark D. Ankeny, Thomas C. Kaspar, Robert Horton Jr.

Iowa State University Patents

An automated tension infiltrometer including a soil contacting base to which is mounted a porous plate for interfacing the infiltrometer with the soil to be analyzed. A Marriotte column is positioned in the base so that its open bottom end abuts the porous plate. A bubble tower is also positioned in the base and has a bubbling tube operatively connected between its interior and interior of the Marriotte column. The bubble tower is adjustable to provide variable tension to the Marriotte column. First and second transducers are positioned at the upper and lower parts of the Marriotte column and continuously ...


Structures Of (±)-Trans-4-(3-Nitrophenyl)- (I) And (+)-Trans-4-(4-Fluorophenyl)-2-Hydroxy-2-Methyl-3,4-Dihydro-2H,5H-Pyrano[3,2-C][1]Benzopyran-5-One (Ii), Van Henry Savell Jr., Edward J. Valente, Drake S. Egglestone Dec 1989

Structures Of (±)-Trans-4-(3-Nitrophenyl)- (I) And (+)-Trans-4-(4-Fluorophenyl)-2-Hydroxy-2-Methyl-3,4-Dihydro-2H,5H-Pyrano[3,2-C][1]Benzopyran-5-One (Ii), Van Henry Savell Jr., Edward J. Valente, Drake S. Egglestone

Chemistry Faculty Publications and Presentations

Derivatives of 2-methyl-3,4-dihydro-2H,5H-pyrano[3,2-c][1]benzopyran-5-one. (I) Racemic trans-2-hydroxy-4-(3-nitrophenyl), C19H15NO6, Mr = 353·33, triclinic, PĪ, a = 12·468 (1), b = 14·531 (3), c = 9·218 (2) Å, α = 99·00 (2), β = 98·03 (1), γ = 84·35 (1)°, V = 1628·3 (7) Å3, Z = 4, Dx= 1·441 g cm-3, λ (Cu ) = 1·54184 Å, μ = 8·679 cm-1, F(000) = 736, T = 294 K, final R = 0·042 for 4981 observations [I ≥ 3δ(I)]. The ...


Book Reviews, Robert Moll Dec 1989

Book Reviews, Robert Moll

Computer Science Department Faculty Publication Series

No abstract provided.


Iupac 32nd International Congress On Macromolecules "Macro 88", Otto Vogl, Naohuki Koide, Tatsuki Kitayama, Koichi Hatada Dec 1989

Iupac 32nd International Congress On Macromolecules "Macro 88", Otto Vogl, Naohuki Koide, Tatsuki Kitayama, Koichi Hatada

Emeritus Faculty Author Gallery

No abstract provided.


Iupac 32nd International Congress On Macromolecules "Macro 88", Otto Vogl, Naohuki Koide, Tatsuki Kitayama, Koichi Hatada Dec 1989

Iupac 32nd International Congress On Macromolecules "Macro 88", Otto Vogl, Naohuki Koide, Tatsuki Kitayama, Koichi Hatada

Otto Vogl

No abstract provided.


Abandoned Underground Coal Mines Of Des Moines, Iowa And Vicinity, Mary R. Howes, Matthew A. Culp, Helene Greenburg Dec 1989

Abandoned Underground Coal Mines Of Des Moines, Iowa And Vicinity, Mary R. Howes, Matthew A. Culp, Helene Greenburg

Iowa Geological Survey Publications

No abstract provided.


M.A.P.S. Digest, Vol.12 No.9 (December 1989), Mid-America Palentology Society Dec 1989

M.A.P.S. Digest, Vol.12 No.9 (December 1989), Mid-America Palentology Society

MAPS Digest: Mid-America Paleontology Society

No abstract provided.


Hr Aurigae: An Active Binary ?, Charles G. Loomis, Edward G. Schmidt Dec 1989

Hr Aurigae: An Active Binary ?, Charles G. Loomis, Edward G. Schmidt

Edward Schmidt Publications

Photometric and spectral observations of the variable star HR Aurigae are presented. Based on these data we conclude that this star, previously regarded as a type II Cepheid, is, in fact, an active binary.


The Probe, Issue 98 - December 1989 Dec 1989

The Probe, Issue 98 - December 1989

The Probe: Newsletter of the National Animal Damage Control Association

THE PROBE National Animal Damage Control Association
DECEMBER 1989
Vote
NADCA Elections
NADCA Annual Meeting
Letters to Ye Ed
APHIS Activity Report
Animal Rights


Pdp/Academic Excellence Workshops In Mathematics, M. Catharine Hudspeth Dec 1989

Pdp/Academic Excellence Workshops In Mathematics, M. Catharine Hudspeth

Humanistic Mathematics Network Journal

No abstract provided.


Pumps, Filters, And Lenses; Humanistic Issues In Calculus Reform, Dan Kalman Dec 1989

Pumps, Filters, And Lenses; Humanistic Issues In Calculus Reform, Dan Kalman

Humanistic Mathematics Network Journal

No abstract provided.


Reflections On Attending Three Contributed Paper Sessions On Humanistic Mathematics In Phoenix 1989, Peter Flusser Dec 1989

Reflections On Attending Three Contributed Paper Sessions On Humanistic Mathematics In Phoenix 1989, Peter Flusser

Humanistic Mathematics Network Journal

No abstract provided.


Tapping Creativity And Ingenuity Of Liberal Arts Majors In A Math Course, Helen Christensen Dec 1989

Tapping Creativity And Ingenuity Of Liberal Arts Majors In A Math Course, Helen Christensen

Humanistic Mathematics Network Journal

No abstract provided.


Introducing Undergraduates To Mathematics Information Resources, Sallie H. Barringer Dec 1989

Introducing Undergraduates To Mathematics Information Resources, Sallie H. Barringer

Humanistic Mathematics Network Journal

No abstract provided.


Mathematics Appreciation: A Humanities Course, Thomas L. Bartlow Dec 1989

Mathematics Appreciation: A Humanities Course, Thomas L. Bartlow

Humanistic Mathematics Network Journal

No abstract provided.


Editorial, Issue 4, 1989, Alvin White Dec 1989

Editorial, Issue 4, 1989, Alvin White

Humanistic Mathematics Network Journal

No abstract provided.


Front Matter, Issue 4, 1989 Dec 1989

Front Matter, Issue 4, 1989

Humanistic Mathematics Network Journal

No abstract provided.


Hassler Whitney 1907-1989: Some Recollections, 1979·1989, Anneli Lax Dec 1989

Hassler Whitney 1907-1989: Some Recollections, 1979·1989, Anneli Lax

Humanistic Mathematics Network Journal

No abstract provided.


The Visits Of Hassler Whitney To Brazil: Hassler Whitney, In Memoriam, Ubiratan D'Ambrosio Dec 1989

The Visits Of Hassler Whitney To Brazil: Hassler Whitney, In Memoriam, Ubiratan D'Ambrosio

Humanistic Mathematics Network Journal

No abstract provided.


Education Is For The Students' Future, Hassler Whitney Dec 1989

Education Is For The Students' Future, Hassler Whitney

Humanistic Mathematics Network Journal

No abstract provided.