Mapping Invisible Surveillance on the North Avenue Smart Corridor, Atlanta

This paper presents a speculative mapping exercise as a feminist resistance method with the aim of rendering surveillance technologies and their fields of view visible. The focus is on the North Avenue Smart Corridor, located in Atlanta, Georgia, which is one of the world's top ten most surveilled cities. Through the design of these speculative maps, I question our relationship with surveillance. More specifically, I show that unnoticeable materiality and invisible processes of smart surveillance technologies prevent the public from forming an opinion on their intrusion into daily life. Acceptance of these technologies allows powerholders to protect and enhance their power over marginalized communities. Therefore, by mapping the intensity of surveillance, this study aims to raise awareness against the lure of technocracy in so-called smart cities. It situates the reader in the position of surveillance sensors and allows the reader to speculate on what they can see. In doing so, it seeks to highlight the oppressive agency of these technologies and question their appeal to objectivity with the potential to disrupt their patriarchal powers. Can we free ourselves from the oppressive gaze of smart surveillance by mapping, seeing, and understanding its remarkably limited fields of view?

A Simplified Capillary Bundle Model for CO2-Alternating-Water Injection Using an Equivalent Resistance Method

CO2-alternating-water injection is an effective way of enhancing recovery for low-permeability oil reservoirs. The injection process is one of the essential issues that are facing severe challenges because of the low permeability and poor pore space connectivity. Previous researchers mentioned that water injection ability could be decreased by around 20% after the CO2-flooding; hence, it is necessary to quantify the water injectivity variation during an alternated injection process. In this paper, a CO2 convection-diffusion model is established based on the seepage law of CO2 and dissipation effect. The relationship between the width of miscible flooding and injection time is defined. Besides, an equivalent resistance method is introduced for developing a capillary bundle model for featuring an unequal diameter for CO2 water vapor alternate flooding. CO2-oil and CO2-water interactions are analyzed using the new model. The effects of oil viscosity, pore throat ratio, CO2 slug size, and equivalent permeability of the capillary bundle on water injection are analyzed. The result indicates that water injection ability increases with the rise of CO2 slug size and equivalent permeability of the capillary bundle and decreases with the increase of viscosity and pore throat ratio.

Optimal parameters of tuned mass dampers for an inverted pendulum with two degrees of freedom

In reality, an inverted pendulum can be used to model many real structures as the fluid tower, super-tall buildings, or articulated tower in the ocean, etc. However, for the inverted pendulum with two degrees of freedom, to the best knowledge of the author, there is no study to determine optimal parameters of two tuned mass dampers (TMD) by using the maximization of equivalent viscous resistance method. Therefore, the current study presents the analytical solutions to the optimization of two orthogonal TMDs, which is used to eliminate vibration of the inverted pendulum with two degrees of freedom. The parameters considered in optimizing are the natural frequency ratios and damping ratios of the two TMDs. The new results of this paper can be summarized as follows: Firstly, the equivalent resistance forces of the two TMDs acting on the inverted pendulum with two degrees of freedom are established. Secondly, the quadratic torque matrices of the vibration response of the inverted pendulum attached with two TMDs is revealed. Thirdly, the optimal expressions are derived using the maximization of equivalent viscous resistance method. The obtained formulae provide exact solutions for the proposed problem. Finally, to confirm the effectiveness of the obtained formulae, parametric studies on vibration are performed for sample articulated tower in the ocean with and without optimal TMDs. Numerical results show that vibrations of the articulated tower attached with optimal TMDs are effectively eliminated. This confirms that the optimal parameters of the two TMDs are determined in this paper are reliable and accurate.