Starfish: A Compact, Biomimetic, and Adaptive Shape Memory Alloy Orbital Debris Remover

This thesis aims to turn the tides on the orbital debris issue through the fabrication and demonstration of a compact, biomimetic, and adaptive shape memory alloy actuated orbital debris remover. The design, referred to as Starfish, is discussed in detail along with its fabrication process and object capture ability. A hard skeleton crafted from PETG was combined with shape memory alloy wires and extension springs to create a biomimetic structure that operates similar to the human hand, capable of gripping a wide range of objects. Relevant simulations were performed and discussed, the iterative fabrication process used to create each component of Starfish is reviewed in detail, and finally, Starfish’s ability to securely grasp objects that closely mimic those seen by actual orbital debris in the space environment is tested along with Starfish’s grip strength on various objects. Starfish demonstrated the ability to passively adjust its grip around target objects due to its extension spring actuated joints, resulting in only a momentary loss of grip strength when a single finger detached from an object before strengthening again. It was determined that Starfish requires 36-40 watts to operate nominally and can perform its capture cycle 45 times before deformation of the structure begins. It was capable of capturing a majority of the debris architypes that exist in the space environment, performing best at capturing flat plates which comprise 36% of the debris environment and preforming worst at capturing spherical objects which comprise 19% of the orbital debris environment

Removal of Multiple Tumors of the Mammary Glands

On Nov. 6, 1952, a ten-year-old female Cocker Spaniel was admitted to the Stange Memorial Clinic for removal of multiple tumors of the mammary glands. The only history obtained was of a previous oophorohysterectomy with no indication of how long the tumors had been present

CRS Issue Briefs

This report discusses the Issues for Congress on Fruits and Vegetables.The primary law that exclusively serves the produce industry is the perishable agriculture commodities act in the 1930(PACA)

Fruits and Vegetables: Issues for Congress

This report discusses the issues for Congress related to fruits & vegetables. The contents include federal activities, programs, farm bill issues, & trade issues

99th Congress

"This paper discusses legislation proposed in the 99th Congress which imposed sanctions against South Africa and provided assistance to the victims of apartheid" (p. iii)

The structural properties of sexual fantasies for sexual offenders : a preliminary model

While the phenomenon of sexual fantasy has been researched extensively, little contemporary inquiry has investigated the structural properties of sexual fantasy within the context of sexual offending. In this study, a qualitative analysis was used to develop a descriptive model of the phenomena of sexual fantasy during the offence process. Twenty-four adult males convicted of sexual offences provided detailed retrospective descriptions of their thoughts, emotions and behaviours—before, during and after their offences. A data-driven approach to model development, known as Grounded Theory, was undertaken to analyse the interview transcripts. A model was developed to elucidate the structural properties of sexual fantasy in the process of sexual offending, as well as the physiological and psychological variables associated with it. The Sexual Fantasy Structural Properties Model (SFSPM) comprises eight categories that describe various properties of sexual fantasy across the offence process. These categories are: origin, context, trigger, perceptual modality, clarity, motion, intensity and emotion. The strengths of the SFSPM are discussed and its clinical implications are reviewed. Finally, the limitations of the study are presented and future research directions discussed