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University of Massachusetts Amherst

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1990

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Articles 1 - 22 of 22

Full-Text Articles in Physical Sciences and Mathematics

Polymer Science In Hungary, Part Iii. The Industrial Research Institutes And Their Factories, Otto Vogl, Gyula Hardy, Sandor Doubravsky, Margit Iring, Ferenc Tudos Dec 1990

Polymer Science In Hungary, Part Iii. The Industrial Research Institutes And Their Factories, Otto Vogl, Gyula Hardy, Sandor Doubravsky, Margit Iring, Ferenc Tudos

Emeritus Faculty Author Gallery

No abstract provided.


73. Professor Cristofor I. Simionescu On His 70th Birthday, Otto Vogl, Ioan I. Negulescu Dec 1990

73. Professor Cristofor I. Simionescu On His 70th Birthday, Otto Vogl, Ioan I. Negulescu

Emeritus Faculty Author Gallery

No abstract provided.


Organic And Polymeric Nonlinear Optical Materials, Otto Vogl, Donald R. Ulrich Dec 1990

Organic And Polymeric Nonlinear Optical Materials, Otto Vogl, Donald R. Ulrich

Emeritus Faculty Author Gallery

No abstract provided.


Polymer Science In Hungary, Part Ii. The Universities In Hungary, Otto Vogl, Jozef Varga, Margit Iring, Ferenc Tudos Nov 1990

Polymer Science In Hungary, Part Ii. The Universities In Hungary, Otto Vogl, Jozef Varga, Margit Iring, Ferenc Tudos

Emeritus Faculty Author Gallery

No abstract provided.


74. Professor Cristofor I. Simionescu On His 70th Birthday, Otto Vogl, Ioan I. Negulescu Nov 1990

74. Professor Cristofor I. Simionescu On His 70th Birthday, Otto Vogl, Ioan I. Negulescu

Emeritus Faculty Author Gallery

No abstract provided.


9th International Symposium On Cationic Polymerization And Related Ionic Processes, Otto Vogl Nov 1990

9th International Symposium On Cationic Polymerization And Related Ionic Processes, Otto Vogl

Emeritus Faculty Author Gallery

No abstract provided.


Polymer Science In Hungary. Part I. The Institutes Of The Hungarian Academy Of Sciences, Otto Vogl, Ferenc Tudos, Margit Iring Oct 1990

Polymer Science In Hungary. Part I. The Institutes Of The Hungarian Academy Of Sciences, Otto Vogl, Ferenc Tudos, Margit Iring

Emeritus Faculty Author Gallery

No abstract provided.


First Pacific Polymer Conference, Jane C. Vogl, Gerald Kirshenbaum Oct 1990

First Pacific Polymer Conference, Jane C. Vogl, Gerald Kirshenbaum

Emeritus Faculty Author Gallery

No abstract provided.


Second Euro-American Conference In Oxford On “Functional Polymers And Biopolymers”, Otto Vogl, Jane C. Vogl Sep 1990

Second Euro-American Conference In Oxford On “Functional Polymers And Biopolymers”, Otto Vogl, Jane C. Vogl

Emeritus Faculty Author Gallery

No abstract provided.


Impacts Of Land Use Laws And Policies Massachusetts State Superfund Program, Umass Amherst Center Economic Development Jan 1990

Impacts Of Land Use Laws And Policies Massachusetts State Superfund Program, Umass Amherst Center Economic Development

Center for Economic Development Technical Reports

The reason for this report was to examine the Massachusetts state Superfund law, and the statutory remedies that Massachusetts relies on to recover the cost associated with the cleanup of oil and hazardous materials released into the environment.


A Study Of Laser Ablation And Slurry Nebulisation Sample Introduction For The Analysis Of Geochemical Materials By Inductively Coupled Plasma Spectrometry, Julian Tyson, S. A. Darke, S. E. Long, C. J. Pickford Jan 1990

A Study Of Laser Ablation And Slurry Nebulisation Sample Introduction For The Analysis Of Geochemical Materials By Inductively Coupled Plasma Spectrometry, Julian Tyson, S. A. Darke, S. E. Long, C. J. Pickford

Chemistry Department Faculty Publication Series

No abstract provided.


Elimination Of Double Peaks In The Iodimetric Flow Injection Visible Spectrophotometric Determination Of Sulphite Using A Single-Channel Manifold, Julian Tyson, A. G. Fogg, X. Wang Jan 1990

Elimination Of Double Peaks In The Iodimetric Flow Injection Visible Spectrophotometric Determination Of Sulphite Using A Single-Channel Manifold, Julian Tyson, A. G. Fogg, X. Wang

Chemistry Department Faculty Publication Series

A flow injection method of determining sulphite with amperometric monitoring of iodine using a single-channel manifold in which iodine is formed in the reverse flow injection (rFI) manner and reacts with sulphite dispersing in the normal flow injection (nFI) manner has been adapted for use with visible spectrophotometry. The carrier stream consists of an alkaline solution containing iodate and an excess of iodide: injections of acid and then of acidified sulphite are made. The decrease in the iodine signal (measured at 352 nm) in the presence of sulphite is proportional to the sulphite concentration in the injectate. The alkalinity of …


Shapes Of Flow Injection Signals: Effect Of Refractive Index On Spectrophotometric Signals Obtained For On-Line Formation Of Bromine From Bromate, Bromide, And Hydrogen Ion In A Single-Channel Manifold Using Large-Volume Time-Based Injections, Julian Tyson, A. G. Fogg, E. Cipko, L. Farabella Jan 1990

Shapes Of Flow Injection Signals: Effect Of Refractive Index On Spectrophotometric Signals Obtained For On-Line Formation Of Bromine From Bromate, Bromide, And Hydrogen Ion In A Single-Channel Manifold Using Large-Volume Time-Based Injections, Julian Tyson, A. G. Fogg, E. Cipko, L. Farabella

Chemistry Department Faculty Publication Series

The shapes of the spectrophotometric signals obtained with a single-channel manifold for large-volume (4 ml) time-based injections for the six possible combinations of the reagents bromate, bromide and nitric acid in the injectate and carrier stream, by which bromine can be formed on-line, have been determined. The injectate and carrier stream were 5.25 x 10-4 M in bromate, 0.030 M in bromide and 1 M in nitric acid when these reagents were present. The signals consisted of two separate peaks caused by formation of bromine at the front and rear boundaries of the injected bolus. When both injectate and carrier …


Is This Paper Within The Scope Of The Journal?, Julian Tyson Jan 1990

Is This Paper Within The Scope Of The Journal?, Julian Tyson

Chemistry Department Faculty Publication Series

No abstract provided.


A Comparison Of Boosted-Discharge Hollow Cathode Lamps And An Inductively Coupled Plasma (Icp) As Excitation Sources In Icp Atomic Fluorescence Spectrometry, Stanley Greenfield, Tariq M. Durrani, Julian Tyson, C. A. Watson Jan 1990

A Comparison Of Boosted-Discharge Hollow Cathode Lamps And An Inductively Coupled Plasma (Icp) As Excitation Sources In Icp Atomic Fluorescence Spectrometry, Stanley Greenfield, Tariq M. Durrani, Julian Tyson, C. A. Watson

Chemistry Department Faculty Publication Series

Copper, nickel and lead boosted-discharge hollow cathode lamps, run at recommended currents, have been compared with a high-powered inductively coupled plasma (ICP) as excitation sources in atomic fluorescence spectrometry (AFS). A similar comparison was made with a copper lamp run at higher currents. It was found that for lead and nickel, the fluorescence spectra differed in the relative intensities of the transitions observed with the two sources. No evidence was found for a difference in radiances between the two sources when the lamp was overrun. Although the lamps gave rise to lower blank standard deviation values, detection limits were worse …


Applications Of The Single Well Stirred Tank Model For Dispersion In Flow Injection, Julian Tyson Jan 1990

Applications Of The Single Well Stirred Tank Model For Dispersion In Flow Injection, Julian Tyson

Chemistry Department Faculty Publication Series

The single well stirred tank model in which dispersion is modelled by the passage of a slug of fluid through the tank has been used to compare the sensitivity that can be obtained by the use of three types of flow injection manifold, which incorporate on-line chemical reaction. These manifolds are the single-line manifold, the double-line manifold and the single-line manifold used in the reverse mode (i.e., the reagent is injected into the sample which constitutes the carrier stream). The model indicates that each manifold type will give the same sensitivity, but that operating conditions and throughput will be different …


Continuing Developments In Atomizer, Source, Inductively Coupled Plasmas In Atomic Fluorescence Spectrometry, Stanley Greenfield, Tariq M. Durrani, Julian Tyson Jan 1990

Continuing Developments In Atomizer, Source, Inductively Coupled Plasmas In Atomic Fluorescence Spectrometry, Stanley Greenfield, Tariq M. Durrani, Julian Tyson

Chemistry Department Faculty Publication Series

No abstract provided.


Flow Injection Manifolds With Membrane Filters For Pre-Concentration And Interference Removal By Precipitation Flow Injection Flame Atomic Absorption Spectrometry, Ebenezer Debrah, C. E. Adeeyinwo, S. R. Bysouth, Julian Tyson Jan 1990

Flow Injection Manifolds With Membrane Filters For Pre-Concentration And Interference Removal By Precipitation Flow Injection Flame Atomic Absorption Spectrometry, Ebenezer Debrah, C. E. Adeeyinwo, S. R. Bysouth, Julian Tyson

Chemistry Department Faculty Publication Series

No abstract provided.


Use Of Masking Agents In The Determination Of Lead In Tap Water By Flame Atomic Absorption Spectrometry With Flow Injection Pre-Concentration, S. R. Bysouth, Julian Tyson, Peter B. Stockwell Jan 1990

Use Of Masking Agents In The Determination Of Lead In Tap Water By Flame Atomic Absorption Spectrometry With Flow Injection Pre-Concentration, S. R. Bysouth, Julian Tyson, Peter B. Stockwell

Chemistry Department Faculty Publication Series

No abstract provided.


On-Line Pre-Concentration Of Refractory Elements For Atomiser, Source, Inductively Coupled Plasmas In Atomic Fluorescence Spectrometry (Asia), Stanley Greenfield, Tariq M. Durrani, Satilmis Kaya, Julian Tyson Jan 1990

On-Line Pre-Concentration Of Refractory Elements For Atomiser, Source, Inductively Coupled Plasmas In Atomic Fluorescence Spectrometry (Asia), Stanley Greenfield, Tariq M. Durrani, Satilmis Kaya, Julian Tyson

Chemistry Department Faculty Publication Series

No abstract provided.


Atomic Spectrometric Detectors For Flow-Injection Analysis, Julian Tyson Jan 1990

Atomic Spectrometric Detectors For Flow-Injection Analysis, Julian Tyson

Chemistry Department Faculty Publication Series

The distinction between liquid chromatography and flow injection analysis is discussed in terms of the underlying concepts, the performance characteristics and the hardware involved. For the last aspect, attention is focused on the role of the detector and the development of spectroscopic detectors for these techniques is discussed. The limitations of atomic spectrometric detectors are discussed for the three most widely used techniques, flame atomic absorption spectrometry, plasma spectrometry and electrothermal atomisation atomic absorption spectrometry, and the recent literature concerned with the use of these techniques for chromatographic detectors is summarized. The use of flow-injecti�n methods to extend the capabilities …


Electroweak Corrections To Parity-Violating Neutral Current Scattering, Mj Musolf, Br Holstein Jan 1990

Electroweak Corrections To Parity-Violating Neutral Current Scattering, Mj Musolf, Br Holstein

Physics Department Faculty Publication Series

We analyze the degree to which parity-violating (PV) electroexcitation of the Δ(1232) resonance may be used to extract the weak neutral axial vector transition form factors. We find that the axial vector electroweak radiative corrections are large and theoretically uncertain, thereby modifying the nominal interpretation of the PV asymmetry in terms of the weak neutral form factors. We also show that, in contrast with the situation for elastic electron scattering, the axial N→Δ PV asymmetry does not vanish at the photon point as a consequence of a new term entering the radiative corrections. We argue that an experimental determination of …