scholarly journals Supramolecular control of unidirectional rotary motion in a sterically overcrowded photoswitchable receptor

2020 ◽  
Vol 7 (23) ◽  
pp. 3874-3879
Author(s):  
Jinyu Sheng ◽  
Stefano Crespi ◽  
Ben L. Feringa ◽  
Sander J. Wezenberg
Keyword(s):  
Guest Molecule ◽  
Rotary Motion ◽  
Supramolecular Control

The induction of unidirectional rotary motion in an achiral, sterically overcrowded, photoswitchable receptor by binding of a chiral guest molecule is unequivocally established.

Electron transfers in graphitized HZSM-5 zeolite

2020 ◽  
Author(s):  
Alain Moissette ◽  
Isabelle Gener-Batonneau ◽  
Matthieu Hureau ◽  
Ludovic Pinard ◽  
Hervé Vezin ◽  
...  
Keyword(s):  
Guest Molecule ◽  
Zeolite P ◽  
Electron Transfers

In the present work, we report the electron transfers occurring after ionization of the guest molecule of t-stilbene incorporated in graphitized HZSM-5 zeolite and we compare these results with the...

scholarly journals Hydrogen Inter-Cage Hopping and Cage Occupancies inside Hydrogen Hydrate: Molecular-Dynamics Analysis

2020 ◽  
Vol 11 (1) ◽  
pp. 282
Author(s):  
Yogeshwaran Krishnan ◽  
Mohammad Reza Ghaani ◽  
Arnaud Desmedt ◽  
Niall J. English
Keyword(s):  
Molecular Dynamics ◽  
Energy Barrier ◽  
Guest Molecule ◽  
Arrhenius Equation ◽  
Dynamics Simulation ◽  
Type Ii ◽  
Large Cage ◽  
Guest Molecules ◽  
Simulation Time ◽  
Average Occupancy

The inter-cage hopping in a type II clathrate hydrate with different numbers of H2 and D2 molecules, from 1 to 4 molecules per large cage, was studied using a classical molecular dynamics simulation at temperatures of 80 to 240 K. We present the results for the diffusion of these guest molecules (H2 or D2) at all of the different occupations and temperatures, and we also calculated the activation energy as the energy barrier for the diffusion using the Arrhenius equation. The average occupancy number over the simulation time showed that the structures with double and triple large-cage H2 occupancy appeared to be the most stable, while the small cages remained with only one guest molecule. A Markov model was also calculated based on the number of transitions between the different cage types.

Forces in rotary motion systems

2008 ◽  
Author(s):  
Markus K. Tilsch ◽  
Gregory K. Elliott
Keyword(s):  
Rotary Motion

scholarly journals Guest Molecule-Responsive Functional Calcium Phosphonate Frameworks for Tuned Proton Conductivity

2014 ◽  
Vol 136 (15) ◽  
pp. 5731-5739 ◽  
Author(s):  
Montse Bazaga-García ◽  
Rosario M. P. Colodrero ◽  
Maria Papadaki ◽  
Piotr Garczarek ◽  
Jerzy Zoń ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
Guest Molecule

ChemInform Abstract: Time-Resolved Assembly of Cluster-in-Cluster {Ag12}-in-{W76} Polyoxometalates under Supramolecular Control.

ChemInform ◽  
2015 ◽  
Vol 46 (1) ◽  
Author(s):  
Caihong Zhan ◽  
Jamie M. Cameron ◽  
Jing Gao ◽  
Jamie W. Purcell ◽  
De-Liang Long ◽  
...  
Keyword(s):  
Time Resolved ◽  
Supramolecular Control

Problem of angular motion control of a non-cooperative on-orbit service object

2021 ◽  
Vol 2021 (1) ◽  
pp. 37-50
Author(s):  
A.A. Fokov ◽  
◽  
O.P. Savchuk ◽  
Keyword(s):  
Motion Control ◽  
State Of The Art ◽  
Object Motion ◽  
The State ◽  
Angular Motion ◽  
Motion Parameter ◽  
Rotary Motion ◽  
Parameter Determination ◽  
Service Object

The realization of existing projects of on-orbit servicing and the development of new ones is a steady trend in the development of space technology. In many cases, on-orbit service clients are objects that exhibit an undesired rotary motion, which renders their servicing difficult or impossible. The problem of on-orbit service object motion control determines the topicality of studies aimed not only at the refinement of methods and algorithms of controlling both the translational and the rotary motion of an object, but also at the development and refinement of methods of onboard determination of the object – service spacecraft relative motion parameters. This paper overviews the state of the art of the problem of object motion parameter determination in on-orbit servicing tasks and existing methods of object motion control and angular motion damping and specifies lines of further investigations into the angular motion control of non-cooperative service objects. Based on the analysis of publications on the subject, the applicability of onboard means for object motion parameter determination is characterized. The analysis of the applicability of methods of remote determination of the parameters of an unknown non-cooperative object from a service spacecraft shows that they are at the research stage. The input data for the verification of methods proposed in the literature were simulated or taken from ground experiments or previous missions. Contact and contactless methods of angular motion control of non-cooperative on-orbit service objects are considered. From the state of the art of investigations into the contactless motion control of on-orbit service objects it may be concluded that the most advanced contactless method of motion control of an on-orbit service object is a technology based on the use of an ion beam directed to the object from an electrojet engine onboard a service spacecraft. Lines of further investigations into non-cooperative object motion control are proposed.

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