Browsing by Subject "3d"

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Construction of 1-D 4F and 3D-4F Coordination Polymers with Flexible Schiff Base Ligands
(2011-07) Yang, Xiaoping; Lam, Daniel; Chan, Christopher; Stanley, Julie M.; Jones, Richard A.; Holliday, Bradley J.; Wong, Wai-Kwok; Yang, Xiaoping; Lam, Daniel; Chan, Christopher; Stanley, Julie M.; Jones, Richard A.; Holliday, Bradley J.
Three new lanthanide 1-D coordination polymers ({[Ln(2)(H2L)(OAc)(6)]center dot EtOH center dot 2H(2)O}(n) (Ln = Eu (1), Er (2)) and {YbNiLCl(OAc)(2)(H2O)}(n) (3)) and a heterobinuclear complex [YbNiLCl3(H2O)(3)] (4) are reported which are formed from salen type Schiff-base ligands H2L (H2L = N,N'-bis(3-methoxysalicylidene) butane-1,4-diamine). The polymeric structures are formed by bridging H2L units in the case of 1 and 2, and by acetate groups in 3. The structures of 1-4 were determined by single crystal X-ray crystallographic studies and their luminescence properties in MeCN solution were determined.
Decision-making in the primate brain : formation, location, and causal manipulation
(2016-05) Katz, Leor Nadav; Huk, Alexander C.; Aldrich, Richard; Cormack, Lawrence K; Hayhoe, Mary; Priebe, Nicholas; Seidmann, Eyal
Interaction within the environment relies on the ability to accumulate sensory evidence in favor of a decision. Despite the paramount importance of decision-making to survival, the neural instantiations and computational principles governing the process have remained elusive. In this thesis I consider how sensory evidence is accumulated to guide decisions, and where in the primate brain this process takes place. I report the results of three main experiments. In the first, I test whether sensory evidence is accumulated differentially for motion in the frontoparallel plane (i.e. 2D motion; left/right) compared to motion through depth (i.e. 3D motion; towards/away). I show that integration of 3D motion is different than 2D and likely relies on a mechanism that is distinct. In the second experiment, I test an influential theory in cognitive neuroscience: that neurons in the monkey lateral intraparietal (LIP) cortex accumulate sensory information in favor of a decision communicated by an eye-movement. I found that despite strong correlations between LIP responses and decisions, reversible inactivation of neurons in LIP had no measurable impact on decision-making performance. More generally, I show that decision-related activity does not necessarily play a causal role in choices. In the final experiment, I test whether the process of making a decision stands to influence functions that are decision irrelevant. I found that causally manipulating the amount of sensory evidence available to human observers influenced decision-irrelevant oculomotor commands, suggesting that even during non- oculomotor decisions, oculomotor regions of the brain are recruited. Taken together, the experimental findings reported motivate new ideas about evidence accumulation and advance our understanding of the decision-making process in the primate brain.
Standardization for intelligent detection and autonomous operation of non-structured hardware, and its application on railcar brake release operation
(2015-05) Hammel, Christopher Scott; Tesar, Delbert; Ashok, Pradeepkumar
This thesis introduces a standard framework for evaluating and planning for desired autonomous (or semi-autonomous) operations, then applies the framework, in detail, to the task of automating emergency brake release before rail-car decoupling. A significant hurdle to be accounted for is the lack of standardization of much of the hardware of interest in industry. Non-standardized rail car components must be formally structured as fully as possible to improve the reliability of the robotic automation. This brake release task requires either pushing or pulling a “bleed rod” that protrudes from the side of each rail car. The requirements for each step of the evaluation and planning process will be laid out in this thesis, as an example of how it should be applied to future automation tasks.