On the Mediational Role of Feelings of Self-Determination in the Workplace: Further Evidence and Generalization

Les objectifs de cette étude visaient à vérifier la généralisation des résultats de Deci et al. (1989) et à évaluer la validité d'un modèle préliminaire de qualité de vie au travail dans lequel les sentiments d'autodétermination jouent un rôle important en tant que médiateurs. Ce modèle stipule que les environnements de travail informationnel et contrôlant auront des impacts opposés sur les sentiments d'autodétermination. Ces sentiments devraient par la suite influencer directement des comportements organisationnels et des variables de santé de l'employé. 184 employés canadiens francophones provenant de différentes organisations ont répondu à l'une des deux versions d'un questionnaire assigné aléatoirement. Les deux échantillons servaient à évaluer le modèle en utilisant deux perspectives d'environnement de travail : informationnel et contrôlant. Dans l'échantillon 1, les employés évaluaient le style du supérieur immédiat alors que dans l'échantillon 2, les sujets évaluaient le climat global de travail. Les résultats d'analyses corrélationnelles et des pistes causales ont confirmé les liens postulés entre les perceptions d'environnement de travail informationnel/contrôlant, les sentiments d'autodétermination et la qualité de vie au travail. Les sentiments d'autodétermination ainsi que la satisfaction et l'intérêt au travail jouaient un rôle de médiateur afin de prédire des impacts proximaux (perceptions d'absentéisme volontaire, distraction au travail et intentions de quitter son travail) de même que des impacts plus distaux ( perception de problèmes de santé physique et mental, consommation de tabac et d'alcool). Ces résultats étaient confirmés dans les deux échantillons.The goals of this study were to extend and to verify the generalizability of Deci et al.'s (1989) results, and to test the validity of a preliminary quality of worklife model in which feelings of self-determination play a key mediational role. This model states that informational and controlling work environments will impact in opposite ways on feelings of self-determination. These feelings should then trigger positive impacts on global work satisfaction and work interest. These two latter variables, in turn, are postulated to impact directly on organizational behaviors and general health variables. Subjects were 184 full-time French Canadian employees from different work settings. They were randomly assigned to one of two versions of a questionnaire assessing the different constructs of the model. Two samples were created to cross-validate results and to test the model with two different loci of perceived informational and controlling work environments. In sample 1, subjects assessed their perceptions of their immediate supervisor's styles whereas in sample 2, subjects assessed their perceptions of the global work climate. Results from correlational and path analyses confirmed the predicted relationships between perceptions of informational/controlling environments, feelings of self-determination and the quality of worklife. The expected mediational role of feelings of self-determination as well as of work satisfaction and interest in explaining proximal impacts (i.e., self-perceptions of voluntary absenteeism, distraction at work, and intentions to change job) as well as more distal impacts (i.e., self-perceptions of mental and physical health, cigarette, and alcohol use) was confirmed across samples

Remote detection of aerosol pollution by ERTS

Photogrammetric and densitometric examination of ERTS-1 MSS imagery of Eastern Virginia coupled with extensive ground truth air quality and meteorological data has shown that the identification and surveying of fixed particulate emitters (smoke plumes) is feasible. A description of the ground truth network is included. The quantitative monitoring of smoke stacks from orbital altitudes over state size regions appears possible when tied to realistic plume models and minimal ground truth. Contrast reductions over urban areas can possibly be utilized to produce isopleths of particulates when supplemented by local measurements

Quantum Heating of a nonlinear resonator probed by a superconducting qubit

We measure the quantum fluctuations of a pumped nonlinear resonator, using a superconducting artificial atom as an in-situ probe. The qubit excitation spectrum gives access to the frequency and temperature of the intracavity field fluctuations. These are found to be in agreement with theoretical predictions; in particular we experimentally observe the phenomenon of quantum heating

Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout

In a Rabi oscillation experiment with a superconducting qubit we show that a visibility in the qubit excited state population of more than 90 % can be attained. We perform a dispersive measurement of the qubit state by coupling the qubit non-resonantly to a transmission line resonator and probing the resonator transmission spectrum. The measurement process is well characterized and quantitatively understood. The qubit coherence time is determined to be larger than 500 ns in a measurement of Ramsey fringes.Comment: 4 pages, 5 figures, version with high resolution figures available at http://www.eng.yale.edu/rslab/Andreas/content/science/PubsPapers.htm

Sideband Transitions and Two-Tone Spectroscopy of a Superconducting Qubit Strongly Coupled to an On-Chip Cavity

Sideband transitions are spectroscopically probed in a system consisting of a Cooper pair box strongly but non-resonantly coupled to a superconducting transmission line resonator. When the Cooper pair box is operated at the optimal charge bias point the symmetry of the hamiltonian requires a two photon process to access sidebands. The observed large dispersive ac-Stark shifts in the sideband transitions induced by the strong non-resonant drives agree well with our theoretical predictions. Sideband transitions are important in realizing qubit-photon and qubit-qubit entanglement in the circuit quantum electrodynamics architecture for quantum information processing.Comment: 4 pages, 5 figures, version with high resolution figures available at http://qudev.ethz.ch/content/science/PubsPapers.htm

Measurement-induced qubit state mixing in circuit QED from up-converted dephasing noise

We observe measurement-induced qubit state mixing in a transmon qubit dispersively coupled to a planar readout cavity. Our results indicate that dephasing noise at the qubit-readout detuning frequency is up-converted by readout photons to cause spurious qubit state transitions, thus limiting the nondemolition character of the readout. Furthermore, we use the qubit transition rate as a tool to extract an equivalent flux noise spectral density at f ~ 1 GHz and find agreement with values extrapolated from a $1/f^\alpha$ fit to the measured flux noise spectral density below 1 Hz.Comment: 5 pages, 4 figures. Final journal versio

Thermal Excitation of Multi-Photon Dressed States in Circuit Quantum Electrodynamics

The exceptionally strong coupling realizable between superconducting qubits and photons stored in an on-chip microwave resonator allows for the detailed study of matter-light interactions in the realm of circuit quantum electrodynamics (QED). Here we investigate the resonant interaction between a single transmon-type multilevel artificial atom and weak thermal and coherent fields. We explore up to three photon dressed states of the coupled system in a linear response heterodyne transmission measurement. The results are in good quantitative agreement with a generalized Jaynes-Cummings model. Our data indicates that the role of thermal fields in resonant cavity QED can be studied in detail using superconducting circuits.Comment: ArXiv version of manuscript to be published in the Physica Scripta topical issue on the Nobel Symposium 141: Qubits for Future Quantum Computers(2009), 13 pages, 6 figures, hi-res version at http://qudev.ethz.ch/content/science/PubsPapers.htm