More Problems With Gap Closing Philosophy and Research.

2005 ◽  
Vol 60 (9) ◽  
pp. 1041-1042 ◽  
Author(s):  
John Raven
Keyword(s):  
2020 ◽  
Vol 125 (26) ◽  
Author(s):  
Norifumi Matsumoto ◽  
Kohei Kawabata ◽  
Yuto Ashida ◽  
Shunsuke Furukawa ◽  
Masahito Ueda

2021 ◽  
Author(s):  
Ian Lundberg

Racism causes racial disparities in health, and structural racism has many components. Focusing on one of those components, this paper addresses occupational segregation. I document high onset of work-limiting disabilities in occupations where many workers identify as non-Hispanic Black or as Hispanic. I then pivot to a causal question. Suppose we took a sample from the population and reassigned their occupations to be a function of education alone. To what degree would health disparities narrow for that sample? Using observational data, I estimate that the disparity between non-Hispanic Black and white workers would narrow by one-third. This estimate is credible because of adjustment for lagged measures of demographics, human capital, and health carried out under transparent causal assumptions. The result contributes to understanding about inequality and health by quantifying the contribution of occupational segregation to a disparity: if we took a sample and reassigned occupations, the disparity would narrow but would not disappear. The paper contributes to methodology by illustrating an approach to macro-level claims (how segregation affects a population disparity) that draws on explicitly causal micro-level analyses (potential outcomes for individuals) for which data are abundant.


2021 ◽  
Author(s):  
Valery P. Dragunov ◽  
Dmitriy I. Ostertak ◽  
Konstantin G. Pelmenev ◽  
Vitaly Yu. Dorzhiev

Author(s):  
Alexander G. Tyapin

The author carries out parametric studies for the equation of planar vibrations of rigid structure resting on kinematical rolling supports with planar bottom (after A.M. Kurzanov). Both support and the surface below are assumed rigid; no sliding assumed. Varied parameter is the width of the bottom. Horizontal structural acceleration is studied. Three variants of the possible behavior are shown: (i) minor rocking with little decrease in response accelerations as compared to the initial excitation; considerable rocking with considerable decrease in the response accelerations; intensive rocking leading to the overturn of the supports. In vertical direction there appear shocks (infinite accelerations) during gap closings of the supports. The importance of the problem for the seismic response analysis of the unanchored items is noted. The author gives recommendations for the experimental program, aimed to obtain data about damping both for rotation and for the gap closing, and also about the impact of the flexibility of the supports and underlying surface.


2000 ◽  
Author(s):  
Hung-Yi Lin ◽  
Weileun Fang

Abstract In the present study, an out-of-plane motion actuator driven by the electrostatic force is designed and fabricated. The electrostatic force generated by the gap closing electrodes and the comb electrodes will be studied. Moreover, a lever motion transmitting mechanism is proposed to modulate the motion of the actuators. Although the space between the driving electrodes is limited, the lever motion transmitting mechanism could enlarge the traveling distance. The applications of the out-of-plane motion actuator are remarkably increased due to the assistant of the transmitting mechanism.


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