Coarse-grained Second Order Response Theory

While linear response theory, manifested by the fluctuation dissipation theorem, can be applied at any level of coarse graining, nonlinear response theory is fundamentally of microscopic nature. For perturbations of equilibrium systems, we develop an exact theoretical framework for analyzing the nonlinear (second order) response of coarse grained observables to time-dependent perturbations, using a path-integral formalism. The resulting expressions involve correlations of the observable with coarse grained path weights. The time symmetric part of these weights depends on the paths and perturbation protocol in a complex manner; in addition, the absence of Markovianity prevents slicing of the coarse-grained path integral. We show that these difficulties can be overcome and the response function can be expressed in terms of path weights corresponding to a single-step perturbation. This formalism thus leads to an extrapolation scheme where measuring linear responses of coarse-grained variables suffices to determine their second order response. We illustrate the validity of the formalism with an exactly solvable four-state model and the near-critical Ising model.Comment: 12 pages, 7 figure

Responsible Fisheries? A Response to the ‘New Path’ of Co-governance

The article “Responsible Fisheries: Kerala Fish Workers Open New Path in Co-governance” (EPW, 29 August 2015) argued that the “Kochi Initiative” in Kerala—a collaboration between fi shers and government scientists—was a major breakthrough in fi sheries governance. We suggest that these authors cheered too soon. Through evidence from coastal Tamil Nadu, we note the history of the debate among fi shers on environmental and justice impacts of new technology. Fisher management skills are usually ignored by state agencies which also fail to govern effectively. While co-management is the way to go, it requires more state effort

Longitudinal Relationships Between Organizational Justice, Productivity Loss, and Sickness Absence Among Older Employees

Purpose The aim of this study was to assess whether organizational justice lowers productivity loss and sickness absence, and whether there are reverse effects of productivity loss and sickness absence on organizational justice.Method A longitudinal study with 2 years of follow-up was conducted among employed persons aged 45–64 years from the Study on Transitions in Employment, Ability and Motivation (STREAM). Participants (N = 7011) yearly filled out an online questionnaire. Structural equation modeling in LISREL was conducted to assess the longitudinal relation-ships between distributive justice of salary, distributive justice of appreciation, procedural justice, productivity loss, and sick-ness absence. Results Both distributive justice of appreciation and procedur-al justice contributed to lower productivity loss and lower sickness absence at 1-year follow-up. Productivity loss in-creased perceptions of distributive justice of appreciation at 1-year follow-up, whereas sickness absence lowered both per-ceptions of distributive justice of appreciation and procedural justice at follow-up. Conclusion Improving organizational justice lowers the risk of productivity loss and sickness absence and may be a useful tool to improve the productivity of organizations

Оправдание науки

textabstractBackground With an ageing society and increasing retirement ages, it is important to understand how employability can be promoted in older workers with health problems. The current study aimed to determine whether (1) different chronic health problems predict transitions from paid employment to disability benefits, unemployment and early retirement, and (2) how workrelated factors modify these associations. Methods Self-report questionnaire data was used from the Dutch longitudinal Study on Transitions in Employment, Ability and Motivation with 3 years of follow-up (2010-2013), among employees aged 45-64 years (N=8149). The influence of baseline chronic health problems and work-related factors on transitions from paid employment to disability benefits, unemployment and early retirement during follow-up was estimated in a competing risks proportional hazards model. Relative excess risk of transitions due to the interaction between chronic health problems and workrelated factors was assessed. Results Severe headache, diabetes mellitus and musculoskeletal, respiratory, digestive and psychological health problems predicted an increased risk of disability benefits (HR range 1.78-2.79). Circulatory (HR=1.35) and psychological health problems (HR=2.58) predicted unemployment, and musculoskeletal (HR=1.23) and psychological health problems (HR=1.57) predicted early retirement. Work-related factors did not modify the influence of health problems on unemployment or early retirement. Psychosocial work-related factors, especially autonomy, modified the influence of health problems on disability benefits. Specifically, among workers with health problems, higher autonomy, higher support and lower psychological job demands reduced the risk of disability benefits by 82%, 49%, and 11%, respectively. Conclusions All health problems affected disability benefits to a similar extent, but psychological health problems especially predicted unemployment and early retirement. For older workers with health problems, promoting an optimal work environment has the potential to contribute to sustainable employment