The Trend of the Gender Wage Gap Over the Business Cycle

Even after the close of the first decade of the 21st century, there is still significant gender bias in labor market composition and compensation. As the events of the last two years have proven, even drastic efforts of monetary and fiscal policy have not tamed the business cycle. Previous research has reached no definite conclusions on the effect of business cycle trends on the gender wage gap. Over the period from 1979:1 to 2009:3, it is found that increases in the growth rate of GDP yield decreases in women‘s earnings relative to men‘s, and it is also found that increases in the unemployment rate yield increases in female earnings relative to male. It is hypothesized that these significant differences in compensation over the trend of the business cycle correspond to inherent differences in the labor supply curves of men and women

Roll, Pitch and Yaw Torque Control for a Robotic Bee

In the last decade, the robotics community has pushed to develop increasingly small, autonomous flapping-wing robotic vehicles for a variety of civilian and military applications. The miniaturization of these vehicles has pushed the boundaries of technology in many areas, including electronics, artificial intelligence, and mechanics; as well as our understanding of biology. In particular, at the insect scale, fabrication, actuation, and flight control of a flapping-wing robot become especially challenging. This thesis addresses these challenges in the context of the “RoboBee” project, which has the goal of creating an autonomous swarm of at-scale robotic bees. A 100mg robot with a 3cm wingspan capable of generating roll, pitch and yaw torques in the range of $\pm 1\mu Nm$ by using a large, central power actuator to flap the wings and smaller control actuators to steer is presented. A dynamic model is used to predict torque generation capabilities, and custom instrumentation is developed to measure and characterize the vehicle’s control torques. Finally, controlled flight experiments are presented, and the vehicle is capable of maintaining a stable pitch and roll attitude during ascending vertical flight. This is the first successful controlled flight of a truly insect-scale flapping-wing robot.Engineering and Applied Science

Artificial insect wings of diverse morphology for flapping-wing micro air vehicles

The development of flapping-wing micro air vehicles (MAVs) demands a systematic exploration of the available design space to identify ways in which the unsteady mechanisms governing flapping-wing flight can best be utilized for producing optimal thrust or maneuverability. Mimicking the wing kinematics of biological flight requires examining the potential effects of wing morphology on flight performance, as wings may be specially adapted for flapping flight. For example, insect wings passively deform during flight, leading to instantaneous and potentially unpredictable changes in aerodynamic behavior. Previous studies have postulated various explanations for insect wing complexity, but there lacks a systematic approach for experimentally examining the functional significance of components of wing morphology, and for determining whether or not natural design principles can or should be used for MAVs. In this work, a novel fabrication process to create centimeter-scale wings of great complexity is introduced; via this process, a wing can be fabricated with a large range of desired mechanical and geometric characteristics. We demonstrate the versatility of the process through the creation of planar, insect-like wings with biomimetic venation patterns that approximate the mechanical properties of their natural counterparts under static loads. This process will provide a platform for studies investigating the effects of wing morphology on flight dynamics, which may lead to the design of highly maneuverable and efficient MAVs and insight into the functional morphology of natural wings.Organismic and Evolutionary Biolog

Integrating Soft Robotics with the Robot Operating System: A Hybrid Pick and Place Arm

Soft robotic systems present a variety of new opportunities for solving complex problems. The use of soft robotic grippers, for example, can simplify the complexity in tasks such as the grasping of irregular and delicate objects. Adoption of soft robotics by the informatics community and industry, however, has been slow and this is, in-part, due to the amount of hardware and software that must be developed from scratch for each use of soft system components. In this paper, we detail the design, fabrication, and validation of an open-source framework that we designed to lower the barrier to entry for integrating soft robotic subsystems. This framework is built on the robot operating system (ROS), and we use it to demonstrate a modular, soft–hard hybrid system, which is capable of completing pick and place tasks. By lowering this barrier to entry through our open sourced hardware and software, we hope that system designers and Informatics researchers will find it easy to integrate soft components into their existing ROS-enabled robotic systems

THE ENDURANCE OF GENTRIFICATION: THREE ESSAYS ON MEANING, MEASUREMENT, AND CONSEQUENCES

Gentrification is the process through which an influx of new investment and new residents with higher incomes and educational attainment flow into a neighborhood over time. This dissertation expands scholarly understanding of gentrification’s meaning, measurement, and consequences through three essays. The first essay reviews, inventories, and critiques the numerous methods scholars have used to identify gentrification. The second essay critiques the normative foundations of the smart growth movement and improves empirical understanding of how that urban policy agenda and gentrification are linked. The final essay identifies gentrification in Maryland’s Purple Line Corridor and with quantitative methods illustrates how gentrification impacts the local business economy. The findings of this dissertation show that gentrification is often not properly identified, smart growth and gentrification can be linked, and that businesses in gentrifying neighborhoods are more likely to close

sj-docx-1-jpe-10.1177_0739456X231187119 – Supplemental material for Gentrification and Business Closures in Maryland’s Purple Line Corridor

Supplemental material, sj-docx-1-jpe-10.1177_0739456X231187119 for Gentrification and Business Closures in Maryland’s Purple Line Corridor by Nicholas Finio in Journal of Planning Education and Research</p