Reference Retrieval Based On User Induced Dynamic Clustering., Robert N. Oddy
Dec 1974
Reference Retrieval Based On User Induced Dynamic Clustering., Robert N. Oddy
Robert Oddy
The problem of mechanically retrieving references to documents, as a first step to fulfilling the information need of a researcher, is tackled through the design of an interactive computer program. A view of reference retrieval is presented which embraces the browsing activity. In fact, browsing is considered important and regarded as ubiquitous. Thus, for successful retrieval (in many circumstances), a device which permits conversation is needed. Approaches to automatic (delegated) retrieval are surveyed, as are on-line systems which support interaction. This type of interaction usually consists of iteration, under the user's control, in the query formulation process. A program has …
Dynamic Mechanical Properties Of A Polypentenamer And Its Hydrogenated Derivatives, William Macknight, K. Sanui, R. W. Lenz
Dec 1973
Dynamic Mechanical Properties Of A Polypentenamer And Its Hydrogenated Derivatives, William Macknight, K. Sanui, R. W. Lenz
William MacKnight
ABSTRACT: A dynamic mechanical study has been carried out on· a polypentenamer and its hydrogenated derivatives. The temperature range was from -160 to 130° and frequencies of 3.5, 11, and 110 Hz were employed. The starting polypentenamer was amorphous and the completely hydrogenated derivative resembled linear polyethylene with a melting point of 130° and a degree of crystallinity of 85%. Three relaxation regions were found in the temperature and frequency range investigated and these are labeled a, {:J, and -y in order of decreasing temperature. The a relaxation (5-115°, 3.5 Hz) is absent in the amorphous polymers and those of …
Hydroformylation Of A Polypentenamer And Preparation Of Derivatives Therefrom, William Macknight, K. Sanui, R. W. Lenz
Dec 1973
Hydroformylation Of A Polypentenamer And Preparation Of Derivatives Therefrom, William Macknight, K. Sanui, R. W. Lenz
William MacKnight
No abstract provided.
Crystallization Of Poly-(Ethylene Coacrylic Acids) And Poly(Ethylene Comethacrylic Acids) And Their Salts, William Macknight, W. P. Taggart, L. Mckenna
Dec 1973
Crystallization Of Poly-(Ethylene Coacrylic Acids) And Poly(Ethylene Comethacrylic Acids) And Their Salts, William Macknight, W. P. Taggart, L. Mckenna
William MacKnight
A study of the crystallization behavior of poly(ethylene coacrylic acids) and poly(ethylene comethacrylic acids) and their lithium, sodium, calcium, and cesium salts has been made utilizing the techniques of X-ray diffraction, differential scanning calorimetry, and infrared spectroscopy. The acid substituent content ranged from 2.1 to 6.3 mol %. The results indicate that the acid substituents do not incorporate into the polyethylene crystal lattice and that these substituents have large effects on the kinetics of crystallization, especially in the case of the salts. The results are interpreted on the basis of a three-phase model consisting of a polyethylene crystal phase, a …
A Model For The Structure Of Ionomers, William Macknight, W. P. Taggart, R. S. Stein
Dec 1973
A Model For The Structure Of Ionomers, William Macknight, W. P. Taggart, R. S. Stein
William MacKnight
The nature of the distribution of ionic groups in cesium salts of ethylene-methacrylic acid and ethylene-acrylic acid copolymers containing 2.1 to 6.3 mo!% acid was examined using the smallangle and wide-angle x-ray scattering techniques. The low-angle data containing a maximum characteristic of these materials were analyzed according to principles of small-angle scattering theory. The radial distribution functions for a typical salt and unionized copolymer were derived from the combined small- and wide-angle data. The results of these two approaches indicate the presence of ionic clusters of the ori:ler of 10-20 A in size. There is evidence that these clusters are …
Preparation Of A Polypentenamer Having Pendant Ionic Groups And Its Hydrogenated Derivatives, William Macknight, K. Sanui, R. W. Lenz
Dec 1973
Preparation Of A Polypentenamer Having Pendant Ionic Groups And Its Hydrogenated Derivatives, William Macknight, K. Sanui, R. W. Lenz
William MacKnight
Polypentenamers having pendant carboxylate groups including esters, acids, and salts and their[hydrogenated derivatives have been prepared and characterized, and some of. their properties investigated. Reaction conditions were established to control the amount of pendant thioglycolate groups incorporated into the polypentenamer by the free-radical addition reactions of thioglycolic acid derivatives and subsequently to completely hydrogenate the polymers so formed, which contained thioglycolate contents ranging from less than 1 mole-% to about 16 mole-%, without backbone degradation and crosslinking reactions. The glass transition temperatures and the melting points of these polymers were observed to depend upon the pendant group content, as expected, …
