Diffusion Measurements for Molecular Capsules:  Pulse Sequences Effect on Water Signal Decay

2005 ◽  
Vol 127 (15) ◽  
pp. 5714-5719 ◽  
Author(s):  
Liat Avram ◽  
Yoram Cohen
Keyword(s):  
Pulse Sequences ◽  
Molecular Capsules ◽  
Signal Decay ◽  
Water Signal

scholarly journals Robust NMR water signal suppression for demanding analytical applications

The Analyst ◽  
2016 ◽  
Vol 141 (1) ◽  
pp. 236-242 ◽  
Author(s):  
Juan A. Aguilar ◽  
Simon. J. Kenwright
Keyword(s):  
Pulse Sequences ◽  
General Purpose ◽  
Analytical Applications ◽  
Signal Suppression ◽  
Water Signal ◽  
Design And Application

We describe the design and application of robust, general-purpose water signal suppression pulse sequences well suited to chemometric work.

Evaluation of pulse sequences used for magnetic resonance sialography

2001 ◽  
Vol 30 (5) ◽  
pp. 276-284 ◽  
Author(s):  
M Sakamoto ◽  
T Sasano ◽  
S Higano ◽  
S Takahashi ◽  
T Nagasaka ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Pulse Sequences ◽  
Magnetic Resonance Sialography

Designing Generators of Poisson Pulse Sequences Based on the Additive Fibonacci Generators

2017 ◽  
Vol 49 (12) ◽  
pp. 1-13 ◽  
Author(s):  
Vladimir N. Maksymovych ◽  
Oleg I. Harasymchuk ◽  
Marya N. Mandrona
Keyword(s):  
Pulse Sequences

Engineering Electronic Structure to Protect Phase Memory in Molecular Qubits by Minimising Orbital Angular Momentum

2018 ◽  
Author(s):  
Ana Maria Ariciu ◽  
David H. Woen ◽  
Daniel N. Huh ◽  
Lydia Nodaraki ◽  
Andreas Kostopoulos ◽  
...  
Keyword(s):  
Electron Spin ◽  
Quantum Coherence ◽  
Quantum Information Processing ◽  
Pulse Sequences ◽  
Grover Algorithm ◽  
Ligand Shell ◽  
Information Strategies ◽  
Spin Qubit ◽  
Molecular Spin ◽  
The Impact

Using electron spins within molecules for quantum information processing (QIP) was first proposed by Leuenberger and Loss (1), who showed how the Grover algorithm could be mapped onto a Mn12 cage (2). Since then several groups have examined two-level (S = ½) molecular spin systems as possible qubits (3-12). There has also been a report of the implementation of the Grover algorithm in a four-level molecular qudit (13). A major challenge is to protect the spin qubit from noise that causes loss of phase information; strategies to minimize the impact of noise on qubits can be categorized as corrective, reductive, or protective. Corrective approaches allow noise and correct for its impact on the qubit using advanced microwave pulse sequences (3). Reductive approaches reduce the noise by minimising the number of nearby nuclear spins (7-11), and increasing the rigidity of molecules to minimise the effect of vibrations (which can cause a fluctuating magnetic field via spin-orbit coupling) (9,11); this is essentially engineering the ligand shell surrounding the electron spin. A protective approach would seek to make the qubit less sensitive to noise: an example of the protective approach is the use of clock transitions to render spin states immune to magnetic fields at first order (12). Here we present a further protective method that would complement reductive and corrective approaches to enhancing quantum coherence in molecular qubits. The target is a molecular spin qubit with an effective 2S ground state: we achieve this with a family of divalent rare-earth molecules that have negligible magnetic anisotropy such that the isotropic nature of the electron spin renders the qubit markedly less sensitive to magnetic noise, allowing coherent spin manipulations even at room temperature. If combined with the other strategies, we believe this could lead to molecular qubits with substantial advantages over competing qubit proposals.<br>

Optimization of Parameters of RF Pulse Sequences for MRI Investigations in the Presence of Magnetic Nanoparticles

2020 ◽  
Vol 65 (9) ◽  
pp. 1416-1420
Author(s):  
Yu. V. Bogachev ◽  
A. V. Nikitina ◽  
V. V. Frolov ◽  
Ya. Yu. Marchenko ◽  
B. P. Nikolaev
Keyword(s):  
Magnetic Nanoparticles ◽  
Pulse Sequences ◽  
Optimization Of Parameters ◽  
Rf Pulse

A Critical, Event-Related Appraisal of Denoising in Resting-State fMRI Studies

2020 ◽  
Vol 30 (10) ◽  
pp. 5544-5559 ◽  
Author(s):  
Jonathan D Power ◽  
Charles J Lynch ◽  
Babatunde Adeyemo ◽  
Steven E Petersen
Keyword(s):  
Resting State ◽  
Resting State Fmri ◽  
Critical Event ◽  
Head Motion ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging ◽  
Decay Properties ◽  
Signal Decay ◽  
Biological Variables ◽  
Related Approach

Abstract This article advances two parallel lines of argument about resting-state functional magnetic resonance imaging (fMRI) signals, one empirical and one conceptual. The empirical line creates a four-part organization of the text: (1) head motion and respiration commonly cause distinct, major, unwanted influences (artifacts) in fMRI signals; (2) head motion and respiratory changes are, confoundingly, both related to psychological and clinical and biological variables of interest; (3) many fMRI denoising strategies fail to identify and remove one or the other kind of artifact; and (4) unremoved artifact, due to correlations of artifacts with variables of interest, renders studies susceptible to identifying variance of noninterest as variance of interest. Arising from these empirical observations is a conceptual argument: that an event-related approach to task-free scans, targeting common behaviors during scanning, enables fundamental distinctions among the kinds of signals present in the data, information which is vital to understanding the effects of denoising procedures. This event-related perspective permits statements like “Event X is associated with signals A, B, and C, each with particular spatial, temporal, and signal decay properties”. Denoising approaches can then be tailored, via performance in known events, to permit or suppress certain kinds of signals based on their desirability.

scholarly journals Arbitrarily Accurate Pulse Sequences for Robust Dynamical Decoupling

2017 ◽  
Vol 118 (13) ◽  
Author(s):  
Genko T. Genov ◽  
Daniel Schraft ◽  
Nikolay V. Vitanov ◽  
Thomas Halfmann
Keyword(s):  
Pulse Sequences ◽  
Dynamical Decoupling

‘Molecular capsules’ based on p-sulfonatocalix[6]arene shrouding two tetraphenylphosphonium cations

2005 ◽  
pp. 1962-1964 ◽  
Author(s):  
Mohamed Makha ◽  
Colin L. Raston ◽  
Alexandre N. Sobolev ◽  
Allan H. White
Keyword(s):  
Molecular Capsules
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