13 research outputs found
Online Appendix for Splitting Operator
Online-only appendix describing the mathematical details of the splitting operator and how to generate rate matrices
Python Script for Comparing Non-Clocklike Triplets to Convergence-Divergence Models
The attached text file is intended to run in Python. Data is simulated from a 3-taxon non-clocklike tree and tested to see whether it is consistent with a 3-taxon convergence-divergence model. Similarly, data is simulated from a 3-taxon convergence-divergence model and tested to see whether it is consistent with a 3-taxon non-clocklike tree
Hydrogen Bonding Network Disruption in Mesoporous Catalyst Supports Probed by PFG-NMR Diffusometry and NMR Relaxometry
The pulsed-field gradient (PFG)-NMR technique has been
applied
to study molecular diffusion of organic liquids within mesoporous
materials used in heterogeneous catalysis, in order to assess the
effect of chemical functionalities on the effective self-diffusivity
of the probe molecule within the pore space. True tortuosity values
of the porous matrix can be calculated from the ratio of the unrestricted
free self-diffusivity to the self-diffusivity within the pore space
only when the small liquid-phase probe molecules do not have any chemical
functionality that interacts within the solid phase (e.g., alkanes).
The use of molecules with reactive chemical functionalities gives
values heavily dependent on the physical and chemical interactions
within the porous medium; hence, these values cannot be defined as
tortuosity. Polyols showed an interesting behavior of enhanced rate
of self-diffusion within the confined pore space, and this is attributed
to the ability of the porous medium to disrupt the extensive intermolecular
hydrogen bonding network of polyols
Hydrogen Bonding Network Disruption in Mesoporous Catalyst Supports Probed by PFG-NMR Diffusometry and NMR Relaxometry
The pulsed-field gradient (PFG)-NMR technique has been
applied
to study molecular diffusion of organic liquids within mesoporous
materials used in heterogeneous catalysis, in order to assess the
effect of chemical functionalities on the effective self-diffusivity
of the probe molecule within the pore space. True tortuosity values
of the porous matrix can be calculated from the ratio of the unrestricted
free self-diffusivity to the self-diffusivity within the pore space
only when the small liquid-phase probe molecules do not have any chemical
functionality that interacts within the solid phase (e.g., alkanes).
The use of molecules with reactive chemical functionalities gives
values heavily dependent on the physical and chemical interactions
within the porous medium; hence, these values cannot be defined as
tortuosity. Polyols showed an interesting behavior of enhanced rate
of self-diffusion within the confined pore space, and this is attributed
to the ability of the porous medium to disrupt the extensive intermolecular
hydrogen bonding network of polyols
Hydrogen Bonding Network Disruption in Mesoporous Catalyst Supports Probed by PFG-NMR Diffusometry and NMR Relaxometry
The pulsed-field gradient (PFG)-NMR technique has been
applied
to study molecular diffusion of organic liquids within mesoporous
materials used in heterogeneous catalysis, in order to assess the
effect of chemical functionalities on the effective self-diffusivity
of the probe molecule within the pore space. True tortuosity values
of the porous matrix can be calculated from the ratio of the unrestricted
free self-diffusivity to the self-diffusivity within the pore space
only when the small liquid-phase probe molecules do not have any chemical
functionality that interacts within the solid phase (e.g., alkanes).
The use of molecules with reactive chemical functionalities gives
values heavily dependent on the physical and chemical interactions
within the porous medium; hence, these values cannot be defined as
tortuosity. Polyols showed an interesting behavior of enhanced rate
of self-diffusion within the confined pore space, and this is attributed
to the ability of the porous medium to disrupt the extensive intermolecular
hydrogen bonding network of polyols
Exploring Surface Interactions in Catalysts Using Low-Field Nuclear Magnetic Resonance
Fast
field cycling (FFC) nuclear magnetic resonance (NMR) is applied to
probe the slow dynamics of liquid molecules imbibed in porous catalysts.
The FFC measurements are used to determine surface diffusion correlation
and residence times that provide information on the molecular dynamics
of surface adsorbed species. The longitudinal relaxation time <i>T</i><sub>1</sub> dispersion curves reveal biphasic diffusion
of adsorbed water that we attribute to the presence of “strongly
bound” and “weakly bound” molecules. FFC measurements
of organic liquids (2-butanone, 2-propanol) do not show such behavior.
These observations agree with molecular dynamics simulations. The
frequency dependence of the relaxation time ratio <i>T</i><sub>1</sub>/<i>T</i><sub>2</sub> is also considered; it
is demonstrated that <i>T</i><sub>1</sub>/<i>T</i><sub>2</sub> remains a valid indicator of adsorption energy regardless
of the field strength at which the measurement is taken in the range <i>B</i><sub>0</sub> = 0.1 mT to 0.23 T
Additional file 2: of Seniors managing multiple medications: using mixed methods to view the home care safety lens
Table of sample Interview & Focus Group Questions. (PDF 171Ă‚Â kb
The moderation of the relationship between Moderate to Vigorous Physical Activity (MVPA) and sleep by outdoor time.
<p>The moderation of the relationship between Moderate to Vigorous Physical Activity (MVPA) and sleep by outdoor time.</p
The association between time of day outdoors and sleep.
<p>The association between time of day outdoors and sleep.</p