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Abstract: Fluorinated copolymers with different compositions and geometric structures have been prepared from 1-trimethylsilyl-1-propyne and its fluorinated containing analogue 1-(3,3,3-trifluoropropyldimethylsilyl)-1-propyne and then studied. The copolymers combine resistance to different hydrocarbons with high permeability coefficients and high selectivity of n-butane separation from its mixture with the noncondensable hydrocarbon methane. High microporosity of the copolymers is confirmed by the results of the determination of the pore volume and pore surface area using low-temperature sorption of nitrogen and the investigation of the film surface by atomic force microscopy (AFM). It has been found that microporosity, which determines the transport properties of the copolymers, depends on both their comonomer composition and the microstructure formed at the stage of polymer synthesis catalyzed by a certain catalyst system. In particular, the copolymers produced in the presence of a TaCl5-Ph3Bi catalyst have a greater pore size and a larger pore surface area relative to copolymers with a similar composition formed in the presence of the NbCl5-Ph3SiH system. The high values of gas transport parameters of the obtained copolymers and their selectivity for recovery of condensable hydrocarbons from vapor-gas mixtures together with resistance to higher hydrocarbons make these copolymers promising membrane materials, e.g., for use in natural gas conditioning processes or separation of C3+ hydrocarbons from associated petroleum gas. [ABSTRACT FROM AUTHOR]

This paper deals with replacement of an existing DC motor by an optimized switched reluctance motor (SRM) for an automotive application, especially for electrical vehicles. The SRM was designed by means of 2D and 3D software based on finite element method and independently designed by a new optimization procedure. The input parameters were taken into account on requirements for a real electrical vehicle, e.g., maximum torque, acceleration and power at different speeds. The designed and subsequently optimized motor was constructed, and the static nonlinear and dynamic performances and parameters were measured and compared with the calculated ones. [ABSTRACT FROM AUTHOR]

Using a NbCl-based catalyst system, random copolymers of 1-(3,3,3-trifluoropropyldimethylsilyl)-1-propyne and 1-trimethylsilyl-1-propyne are synthesized in a wide range of comonomer contents. The dependences of gas-transport behavior on the composition and supramolecular organization of the copolymer are studied. Composition regions and conditions of preparing copolymers combining high permeability coefficients with resistance against nonpolar organic solvents are ascertained. The copolymers demonstrate a high selectivity in the separation of butane from a methane-butane mixture. [ABSTRACT FROM AUTHOR]

Introduction: Risk factors for employment difficulties after cancer diagnosis are incompletely understood, and interventions to improve post-cancer employment remain few. New targets for intervention are needed. Methods: We assessed a cohort of 530 nonmetastatic cancer patients (aged ≤ 65 years, >6 months from diagnosis, off chemo- or radiotherapy) from the observational multi-site Symptom Outcomes and Practice Patterns study. Participants reported employment change, current employment, and symptoms. Groups were based on employment at survey (working full- or part-time versus not working) and whether there had been a change due to illness (yes versus no). The predictive power of symptom interference with work was evaluated for employment group (working stably versus no longer working). Race/ethnicity, gender, cancer type, therapy, and time since diagnosis were also assessed. Association between employment group and specific symptoms was examined. Results: The cohort was largely non-Hispanic white (76 %), female (85 %), and diagnosed with breast cancer (75 %); 24 % reported a change in employment. On multivariable analysis, participants with at least moderate symptom interference were more likely to report no longer working than their less effected counterparts (odds ratio (OR) = 8.0, 95 % CI, 4.2-15.4), as were minority participants compared with their non-Hispanic white counterparts (OR = 3.2, 95 % CI, 1.8-5.6). Results from the multiple regression model indicated the combination of fatigue (OR = 2.3, 95 % CI, 1.1-4.7), distress (OR = 3.9, 95 % CI, 1.7-9.0), and dry mouth (OR = 2.6, 95 % CI, 1.1-6.2) together with race/ethnicity and time since diagnosis adequately accounted for employment group. Conclusions: Our findings support the hypothesis that residual symptom burden is related to post-cancer employment: Residual symptoms may be targets for intervention to improve work outcomes among cancer survivors. Implications for Cancer Survivors: This analysis examines whether increased symptom burden is associated with a change to not working following a cancer diagnosis. We also examined individual symptoms to assess which symptoms were most strongly associated with not working after a cancer diagnosis. Our hope is that we will be able to use this information to both screen survivors post-active treatment as well as target high-risk symptoms for further and more aggressive intervention, in an attempt to improve post-cancer work outcomes. [ABSTRACT FROM AUTHOR]

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