Film mounting method for thermomechanical analysis

Mounting clamps attach polymeric film sample to thermomechanical analyzer. Using this technique, temperature at which polymer passes from relatively nonflexible or glasslike state to rubbery condition where it exhibits marked increase in flow properties is readily determined

Polyphenylene ethers with imide linking groups

Novel polyphenylene ethers with imide linking units are disclosed. These polymers incorporate the solvent and thermal resistance of polyimides and the processability of polyphenylene ethers. Improved physical properties over those of the prior art are obtained by incorporating meta linked ethers and/or polyphenylene oxides into the polymer backbone. A novel process for making polymers of this type is also disclosed. The process is unique in that the expected need of high process temperatures and/or special atmospheres are eliminated

Process of end-capping a polyimide system

A process of endcapping a polyimide system with an endcapping agent in order to achieve a controlled decrease in molecular weight and melt viscosity along with predictable fracture resistance of the molded products is disclosed. The uncapped system is formed by combining an equimolar ratio of 4,4'-bis (3,4-dicarboxyphenoxy) diphenylsulfide dianhydride (BDSDA) and 1,-bis (aminophenoxy) benzene (APB) dissolved in bis (2-methoxyethyl)ether. The endcapped system is formed by dissolving APB in bis-(2-methoxyethyl)ether, adding the BDSDA. By varying the amount of endcapping from 0 to 4%, molecular weight is decreased from 13,900 to 8660. At a processing temperature of 250 C, there is a linear relationship between molecular weight and viscosity, with the viscosity decreasing by two orders of magnitude as the molecular weight decreased from 13,900 to 8660

Letter from [Frances & Jesse burks] to [John Muir], [ca. 1901 Dec 20].

Jesse Williston BurksBorn December 20, 1901With greetings fromFrances Williston BurksJesse Dismu[kes?] BurksPleasant memories of theSummer evenings in the high Sierra557 W. 124 StreetNew York0290

What Are Over-the-Road Truckers Paid For? Evidence from an Exogenous Regulatory Change on the Role of Social Comparisons and Work Organization in Wage Determination

Using evidence from recent work on truckers and disaggregated older data prior researchers did not have, we revisit a classic topic and find some new answers. We focus on differentials in average annual earnings at the firm level among mileage-paid over-the-road tractor-trailer drivers ("road drivers") employed by US for-hire trucking companies, before and after economic deregulation. Road driver output is individualized, and pay is on the basis of a piece rate (mileage). However, road drivers work under two distinct logistical systems – less-than-truckload [LTL], and truckload [TL] – associated with two different forms of work organization. We find that – contrary to the predictions of Rose (1987) – not only are road drivers for LTL companies paid more than those for TL companies, but in LTL the union earnings premium was maintained following deregulation and union coverage fell slowly, while in TL both the union differential and union coverage fell sharply. We review relevant theoretical explanations: payment for cognitive abilities or non-pecuniary disamenities; standard efficiency wage models based on independent utilities; sharing of product market rents; equity concerns resulting from social comparisons between employee groups; and differences in work organization as a source of union rents or quasi-rents. Only equity concerns, for the LTL earnings differential, and quasi rents (but not a union threat effect, contrary to Henrickson and Wilson (2008)), for union coverage and premium in LTL, are consistent with our empirical results. Both earnings differentials are based on differences in work organization, rather than differences in the workers or the work itself.less-than-truckload (LTL), trucker, trucking, work organization, rent-sharing, quasi-rent, cognitive ability, compensating differential, equity, fair wage, truckload (TL), regulation, deregulation, union premium

A Multi-Method Approach to Identifying Norms and Normative Expectations within a Corporate Hierarchy: Evidence from the Financial Services Industry

This paper presents the results of a field study at a large financial services firm that combines multiple methods, including two economic experiments, to measure ethical norms and their behavioral correlates. Standard survey questions eliciting ethical evaluations of actions in on-the-job ethical dilemmas are transformed into a series of incentivized coordination games in the first experiment. We use the results of this experiment to identify the actual ethical norms for financial adviser behavior held by key personnel – financial advisers and their corporate leaders – in three settings: a clash of incentives between serving the client and earning commissions, a dilemma about fiduciary responsibility to a client, and a dilemma about whistle-blowing on a peer. We also measure the beliefs of financial advisers about the ethical expectations of their corporate leaders and the beliefs of corporate leaders about financial adviser norms. In addition, we ask financial advisers about their personal normative opinions, matching a common methodology in the literature. We find, first, systematic agreements in the normative evaluations across the corporate hierarchy that are consistent with ex ante expectations, but second, we also find some measurable differences between the normative expectations of corporate leaders about on-the-job behavior and the actual norms shared among financial advisers. When there is a normative mismatch across the hierarchy we are able to distinguish miscommunication from ethical disagreement between leaders and employees. Our subjects also report their job satisfaction and take part in a second incentivized experiment in which it is costly to report private information honestly. A last finding is that a mismatch between advisers’ personal ethical opinions and corporate norms – especially those of peers – strongly correlates with job dissatisfaction, and less strongly but significantly with the willingness to be dishonest.field experiment, financial services, corporate leader, financial adviser, ethics, norms, coordination game

Performance Pay and the Erosion of Worker Cooperation: Field experimental evidence

We report the results of a field experiment with bicycle messengers in Switzerland and the United States. Messenger work is individualized enough that firms can choose to condition pay on it, but significant externalities in messenger behavior nonetheless give their on-the-job interactions the character of a social dilemma. Firms therefore suffer efficiency losses when messengers fail to cooperate. Second-mover behavior in our sequential Prisoner’s Dilemma allows us to characterize the cooperativeness of our participants. We find that messengers, like our student controls, have heterogeneous social preferences, but are much more cooperative than students. Among messengers, we find that employees at firms that pay for performance are significantly less cooperative than those who are paid hourly or are members of cooperatives. To examine whether the difference is the result of treatment or selection we exploit the fact that firm type is location-specific in Switzerland and that entering messengers must work in performance pay firms in the U.S. We find that the erosion of cooperation under performance pay is predominantly due to treatment, and that the treatment effect is relatively rapid, more akin to the differential cueing of a behavioral norm than the gradual acquisition of a new preference.field experiment, social preference, altruism, conditional cooperation, egoism, social dilemma

Copolyimide with a combination of flexibilizing groups

Copolyimides are prepared by reacting one or more aromatic dianhydrides with a meta-substituted phenylene diamine and an aromatic bridged diamine. The incorporation of meta-substituted phenylene diamine derived units and bridged aromatice diamine derived units into the linear aromatic polymer backbone results in a copolyimide of improved flexibility, processability, and melt-flow characteristics. The copolyimides are especially useful as thermoplastic hot-melt adhesives