University of Akron

About: University of Akron is a education organization based out in Akron, Ohio, United States. It is known for research contribution in the topics: Polymer & Polymerization. The organization has 17401 authors who have published 29127 publications receiving 702386 citations. The organization is also known as: The University of Akron.

Expressed vocational choice and vocational indecision.

Abstract: This study equally divided 232 male and female college students into four groups based on their responses to the Occupational Alternatives Question. Groups were composed of subjects who had a first choice and no alternatives, a first choice plus alternatives, no first choice but alternatives, and neither a first choice nor alternatives. The hypothesis tested was that these groups would differ on dependent variables related to vocational decision making. No significant differences were found on socioeconomic status or on Holland's constructs of consistency, differentiation, or congruence with career choice. Significant group differences were found on congruence with college major, total number of Vocational Preference Inventory responses, and scales measuring satisfaction with college major and career choice. Significant differences were also found on two recent scales measuring vocational indecision, that is, the Vocational Decision Making Difficulty Scale and the Career Decision Scale. Significant sex differences indicated that females were more congruent and satisfied with their college majors. The results are discussed and their implications for future research and vocational counseling are examined. In the literature on vocational choice, the variable of expressed choice has recently been gaining increased research support. The definitive review by Dolliver (1969) perhaps gave impetus to the investigation of expressed choice, and at present an impressive number of studies exist which consistently indicate that expressed choices have predictive validity—in terms of college major or career choice—that equals or exceeds that of inventoried interests (Borgen & Seling, 1978; Dolliver & Will, 1977; Gade & Soliah, 1975; Gottfredson & Holland, 1975; Holland & Gottfredson, 1975; Holland & Lutz, 1968; O'Neil & Magoon, 1977; O'Neil, Magoon, & Tracey, 1978; Touchton & Magoon, 1977). The findings mentioned previously on expressed choice become additionally interesting relative to a number of studies that have attempted to measure differences be

Synthesis and Characterization of Polyimides Based on 3,6-Diphenylpyromellitic Dianhydride:

Abstract: 3,6-Diphenylpyromellitic dianhydride (DPPMDA) has been synthesized from 2,5-diphenyl-3,4-bis(4-methoxyphenyl)cyclopentadiene-1-one and dimethyl acetylenedicarboxylate. The monomer was polymerized w...

Contact activation of the plasma coagulation cascade. I. Procoagulant surface chemistry and energy

Abstract: Contact activation of the intrinsic pathway of porcine blood plasma coagulation is shown to be a steep exponential-like function of procoagulant surface energy, with low activation observed for poorly water-wettable surfaces and very high activation for fully water-wettable surfaces. Test procoagulants studied were a system of oxidized polystyrene films with varying wettability (surface energy) and glass discs bearing close-packed self-assembled silane monolayers (SAMs) with well-defined chemistry consisting of 12 different terminating chemical functionalities. A monotonic trend of increasing coagulation activation with increasing water wettability was observed for the oxidized polystyrene system whereas results with SAM procoagulants suggested a level of chemical specificity over and above the surface energy trend. In particular, it was noted that coagulation activation by SAMs terminated with -CO 2 H was much higher than anticipated based on surface wettability whereas -NH 3 ? ?-terminated SAMs exhibited very low procoagulant activity. SAMs terminated in -(CH 2 ) 2 (CF 2 ) 7 CF 3 behaved as anticipated based on surface energy with very low procoagulant activity and did not exhibit special properties sometimes attributed to perfluorinated compounds. Quantitative ranking of the inherent coagulation activation properties of procoagulant surfaces was obtained by application of a straightforward phenomenological model expressed in a closed-form mathematical equation relating coagulation time to procoagulant surface area. Fit of the model with a single adjustable parameter to experimental measurements of porcine platelet-poor plasma coagulation time was very good, implying that assertions and simplifications of the model adequately simulated reality. Two important propositions of the model were that (1) the number of putative activating sites scaled linearly with procoagulant surface area, and (2) contact activation of the plasma coagulation cascade was catalytic in the sense that these activating sites were not consumed or poisoned by irreversible or slowly reversible protein adsorption during coagulation. An extension of the coagulation model proposed that procoagulant activation properties scale exponentially with the surface density of polar (acid-base) sites, which, in turn, was related to procoagulant wettability. © 1995 John Wiley & Sons, Inc.

A Series of New Medium‐Bandgap Conjugated Polymers Based on Naphtho[1,2‐c:5,6‐c]bis(2‐octyl‐[1,2,3]triazole) for High‐Performance Polymer Solar Cells

Abstract: A series of novel conjugated copolymers based on naphtho[1,2-c:5,6-c]bis(2-octyl-[1,2,3]triazole) (TZNT) are synthesized. These copolymers exhibit medium bandgaps of ≈1.9 eV. One of them demonstrates a high performance of up to 6.10% power conversion efficiency in a bulk-heterojunction (BHJ) solar-cell device. The performance can be further enhanced to 7.11% when applied in an inverted device architecture, using PF3 N-OX as an interfacial modifier.