Education in Transition: Structure, Expansion and Inequality

2019 ◽  
pp. 91-122
Author(s):  
Svitlana Oksamytna
Keyword(s):  
Transition Structure

scholarly journals Striatal and hippocampal contributions to flexible navigation in rats and humans

2020 ◽  
Vol 4 ◽  
pp. 239821282097977
Author(s):  
Christoffer J. Gahnstrom ◽  
Hugo J. Spiers
Keyword(s):  
Caudate Nucleus ◽  
Spatial Navigation ◽  
Dorsal Striatum ◽  
Future Research ◽  
Neural Responses ◽  
Learning Models ◽  
Transition Structure ◽  
Cortical Areas ◽  
Reinforcement Learning Models ◽  
Human Neuroimaging

The hippocampus has been firmly established as playing a crucial role in flexible navigation. Recent evidence suggests that dorsal striatum may also play an important role in such goal-directed behaviour in both rodents and humans. Across recent studies, activity in the caudate nucleus has been linked to forward planning and adaptation to changes in the environment. In particular, several human neuroimaging studies have found the caudate nucleus tracks information traditionally associated with that by the hippocampus. In this brief review, we examine this evidence and argue the dorsal striatum encodes the transition structure of the environment during flexible, goal-directed behaviour. We highlight that future research should explore the following: (1) Investigate neural responses during spatial navigation via a biophysically plausible framework explained by reinforcement learning models and (2) Observe the interaction between cortical areas and both the dorsal striatum and hippocampus during flexible navigation.

scholarly journals A COMPACT UWB BPF WITH SHARP ROLL-OFF USING CPW TO MICROSTRIP TRANSITION STRUCTURE

2017 ◽  
Vol 66 ◽  
pp. 33-38 ◽  
Author(s):  
Xinlin Xia ◽  
Yu Liu ◽  
Hao Peng ◽  
Minghuan Ni ◽  
Haodong Lin ◽  
...  
Keyword(s):  
Transition Structure

An unusual abnormal Wolff rearrangement

2003 ◽  
Vol 81 (6) ◽  
pp. 517-524 ◽  
Author(s):  
Howard E Zimmerman ◽  
Pengfei Wang
Keyword(s):  
Reaction Mechanism ◽  
Ab Initio ◽  
Transition Structure ◽  
Wolff Rearrangement ◽  
Photochemical Rearrangement ◽  
Bicyclic Structure

An unusual example of the abnormal Wolff rearrangement was studied. The bicyclic structure of the reactant and intermediates precluded some mechanistic possibilities of this unusual Abnormal Wolff Rearrangement. The study involved the photochemical rearrangement of diazodehydronorbornone bearing phenyl and 2-pyridyl groups at C-7. A number of examples of interesting stereoselectivity were encountered. The mechanism was investigated by use of ab initio QST type computations which located a unique transition structure species accounting for the reaction mechanism.Key words: abnormal-Wolff, carbene, rearrangement, QM computations, reaction mechanism.

A Differential UWB Quasi-Yagi Antenna with A Reconfigurable Notched Band

Frequenz ◽  
2018 ◽  
Vol 72 (9-10) ◽  
pp. 401-406 ◽  
Author(s):  
Feng Wei ◽  
Xin Tong Zou ◽  
Xin Yi Wang ◽  
Bin Li ◽  
Xi Bei Zhao
Keyword(s):  
Microstrip Line ◽  
Design Procedure ◽  
Wide Band ◽  
Impedance Bandwidth ◽  
Differential Mode ◽  
Transition Structure ◽  
Notched Band ◽  
Quarter Wavelength ◽  
Yagi Antenna ◽  
Good Agreement

Abstract A compact differential ultra-wide band (UWB) planar quasi-Yagi antenna is presented in this paper. The proposed antenna consists of a balanced stepped-impedance microstrip-slotline transition structure, a driver dipole and one parasitic strip. A wide differential-mode (DM) impedance bandwidth covering from 3.8 to 9.5 GHz is realized. Meanwhile, a high and wideband common-mode (CM) suppression can be achieved by employing the balanced stepped-impedance microstrip-slotline transition structure. It is noted that the DM passband is independent from the CM response, which can significantly simplify the design procedure. In addition, a reconfigurable sharp DM notched band from 5.6 to 6.7 GHz is generated by adding one pair of quarter-wavelength varactor-loaded short-circuited stubs adjacent to the microstrip line symmetrically. In order to illustrate the effectiveness of the design, two prototypes of the antennas are designed, fabricated, and measured. A good agreement between the simulated and measured results is observed.

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