Development of an Advanced Sham Coil for Transcranial Magnetic Stimulation and Examination of Its Specifications

Transcranial magnetic stimulation (TMS) neurophysiology has been widely applied worldwide, but it is often contaminated by confounders other than cortical stimulus-evoked activities. Although advanced sham coils that elaborately mimic active stimulation have recently been developed, their performance is not examined in detail. Developing such sham coils is crucial to improve the accuracy of TMS neurophysiology. Herein, we examined the specifications of the sham coil by comparison with the active coil. The magnetic flux and click sound pressure changes were measured when the stimulus intensity was varied from 10% to 100% maximum stimulator output (MSO), and the changes in coil surface temperature over time with continuous stimulation at 50% MSO for each coil. The magnetic flux change at the center of the coil showed a peak of 12.51 (kT/s) for the active coil, whereas it was 0.41 (kT/s) for the sham coil. Although both coils showed a linear change in magnetic flux as the stimulus intensity increased, due to the difference in coil winding structure, the sham coil took less than half the time to overheat and had 5 dB louder coil click sounds than the active coil. The sham coil showed a sufficiently small flux change at the center of the coil, but the flux change from the periphery of the coil was comparable to that of the active coil. Future use of high-quality sham coil will extend our understanding of the TMS neurophysiology of the cortex at the stimulation site.

An analysis of interdecadal variations in the perturbational feedback parameter based on a MIROC6 piControl simulation

The climate feedback parameter is a useful indicator for estimating climate sensitivity relating to anthropogenic forcing. This study defines a new feedback parameter, the Perturbational Feedback Parameter (PFP), and the impacts of internally-generated climate variations are clarified using the MIROC piControl simulation. PFP values are found to vary significantly on interdecadal timescales. The equatorial sea surface temperature (SST) has a positive anomaly in the eastern Pacific and a negative anomaly in the western Pacific, and the thermocline tilts more gently than usual when the PFP is large. The statistical properties of the interannual fluctuations also simultaneously vary, and they correspond to the background state. For example, there is an increase in the El Niño Southern Oscillation (ENSO) amplitude relative to the global mean surface temperature rise, and the equatorial high SST more effectively contributes to the southward shift of the Intertropical Convergence Zone (ITCZ). In addition, a decadal fluctuation that dominates over the extratropical northern Pacific also plays an important role in PFP variations. These fluctuations on broad timescales cooperatively induce increases in lower clouds within the subtropics by strengthening the descending flow and static stability, and the consequential net downward radiation flux change through increases in reflection enhances the PFP. In summary, internal changes in both tropical and extratropical variability corresponding to the background state control the strength of the climate feedback on interdecadal timescales.

Dynamic temperature effects on diffusive transport behaviors of VOC vapors in unsaturated soils

<p>Investigation of the transport behaviors of volatile organic compounds (VOCs) in contaminated soils has previously been conducted in various environments. Accordingly, the present study focuses on specific phenomena in the near-surface soil environment where dynamic temperature affects the diffusive flux of VOC vapor phase as previous studies have suggested that temperature variations significantly influence such transport behaviors near-surface soils, but the nature of those influences and their mechanisms have remained unclear because of unexpected correlation of flux with the temperature that impacts on VOC vapor transport. More specifically, current practices report on a set of experiments into the vertical and upward vapor phase diffusive transport of benzene and trichloroethylene (TCE) in sandy soils that were conducted in soil column with water content conditions of up to 10 wt% and sinusoidal temperature conditions ranging from 20 to 30°C. This studies experimentally investigated that in all conditions tested, the top (outlet) flux change correlated positively with temperature change, while the bottom (inlet) flux change showed negative correlations. These results are consistent with previous observations showing that, at relatively deeper locations, there is little correlation between near-surface vertical VOC flux and soil temperature levels, and that VOC concentrations can be independent of the soil temperature at those locations. The present study's results highlighted for the first time that the negative correlation impact of temperature on VOC transport may occur frequently at deeper locations of subsurface soil. This occurs because the VOC concentration gradient is reduced by VOC desorption and the evaporation of water containing VOCs that accompany increasing temperature levels. However, our results also show that such mechanisms have a positive impact on VOC emissions from the upper part of subsurface soils to the atmosphere that can act as a low concertation boundary.</p>

What causes the spread of model projections of ocean dynamic sea-level change in response to greenhouse gas forcing?

Sea levels of different atmosphere–ocean general circulation models (AOGCMs) respond to climate change forcing in different ways, representing a crucial uncertainty in climate change research. We isolate the role of the ocean dynamics in setting the spatial pattern of dynamic sea-level (ζ) change by forcing several AOGCMs with prescribed identical heat, momentum (wind) and freshwater flux perturbations. This method produces a ζ projection spread comparable in magnitude to the spread that results from greenhouse gas forcing, indicating that the differences in ocean model formulation are the cause, rather than diversity in surface flux change. The heat flux change drives most of the global pattern of ζ change, while the momentum and water flux changes cause locally confined features. North Atlantic heat uptake causes large temperature and salinity driven density changes, altering local ocean transport and ζ. The spread between AOGCMs here is caused largely by differences in their regional transport adjustment, which redistributes heat that was already in the ocean prior to perturbation. The geographic details of the ζ change in the North Atlantic are diverse across models, but the underlying dynamic change is similar. In contrast, the heat absorbed by the Southern Ocean does not strongly alter the vertically coherent circulation. The Arctic ζ change is dissimilar across models, owing to differences in passive heat uptake and circulation change. Only the Arctic is strongly affected by nonlinear interactions between the three air-sea flux changes, and these are model specific.

Under-dressed: Vests as representations of White, liminal masculinity and the transnational body in Saturday Night Fever and Raging Bull

The 1970s is often considered a period in which masculinity was in crisis. This article considers that through cinematic representation and the use of the white cotton vest as a motif of hegemonic and working-class masculinity, masculinity was not in crisis, but in transition. The focus on films Saturday Night Fever and Raging Bull, is used here to exemplify discussions surrounding primarily hetero-normative masculinity, nationhood, tradition and the White working-class male body both dressed and undressed, and how these provide spaces through narrative and mise en scène to discuss notions of flux, change and fluidity that maps and arcs ‘masculinity’ to masculinities. The male body is deconstructed and reconstructed through the vest and becomes public spectacle. The centrality of the vest and its purpose within these (and many other) films during the period, acts as a means of revealing more than just the body of the wearer. In particular, the ethnicity of the protagonist and the repurposing of stereotypes through the vest as motif, underpin the credibility of the narrative and can be understood as a means of simplifying or coding approaches to shifting masculinities.

EXPERIMENTAL STUDY OF THE PRESSURE DROP OF THE ECOFLUID R1234YF COMPARED TO THE FLUID R134A IN SMOOTH TUBES WITH 4.8MM INTERNAL DIAMMETER

The refrigerant fluid R1234yf is a hydrofluorefine with zero potential for degradation of the ozone layer and low potential for global warming. It is one of the potential substitutes for the currently used R134a in automotive systems. In this work, the pressure drop suffered by the fluids R134a and R1234yf when flowing in a test section through a pipe with a 4.8 mm internal diameter was measured. The pressure drop was plotted as a function of the void fraction at the exit of the test section and the values were compared concerning the change in mass flux, change in saturation temperature, and comparatively between R1234yf and R134a. A significant increase in pressure drop was observed by the increases of the mass flux, showing an increment of 155.46% of the pressure loss from 200 to 300 kg·m-2·s-1 for R1234yf at 35ºC and 161.07% for R134a in the same conditions. Despite being high, those values are expected since increasing mass flux also increases the friction between both phases. On the other hand, by increasing the saturation temperature, the pressure drop is slightly lower once the differences between the densities of the liquid and vapor phases are reduced. Compared with R134a, the R1234yf ecofluid presents less pressure drop, showing a reduction of 24% for 300 kg·m-2·s-1.

Application of the Response Surface Methodology for Designing Oscillation Drying of Beech Timber

Oscillation drying is one of the possible approaches for reducing drying time and limiting drying defects of hardwood timber. This study aimed to design oscillation-drying schedules for beech (Fagus sylvatica L.) timber using the response surface methodology (RSM) and to develop an empirical model describing relationships between drying time, drying rate, moisture content gradient after drying, and the parameters of oscillation drying, i.e., dry-bulb temperature increase, equilibrium moisture content (EMC) decrease, and the duration of phase #1 in the drying schedule. The design employed 8 unique drying schedules for which early stage of drying was studied. The Gompertz model was used to describe the change in moisture flux as a function of moisture content, with estimated parameters of the model used to determine relations between the maximum flux at the initial moisture content, the maximum rate of flux change, and the critical moisture content for the maximum rate of flux change for each oscillation-drying schedule. Analysis of variance (ANOVA) revealed that the decrease in EMC was the only factor significantly influencing oscillation drying. For the most intense oscillation-drying schedule, maximum moisture flow was ca. 75% higher compared with the control drying schedule. Drying processes that accounted for a decrease of EMC from 15% to 12% were characterized by significantly shorter drying time (by 35.8%), 52.6% higher drying intensity, and ca. two times larger moisture content gradient. These results confirm theoretical findings relating the increase of oscillation-drying intensity with the difference in wet-bulb temperature between phases of the drying processes.