A simple set up for the measurement of patient response time in fMRI

2010 ◽  
Author(s):  
Ali Demir ◽  
Ali Umit Keskin ◽  
Mehmet Unsal ◽  
Ali Bayram
Keyword(s):  
Response Time ◽  
Patient Response ◽  
Simple Set ◽  
Set Up

scholarly journals Seasonal variations and north–south asymmetries in polar wind outflow due to solar illumination

2016 ◽  
Vol 34 (11) ◽  
pp. 961-974 ◽  
Author(s):  
Lukas Maes ◽  
Romain Maggiolo ◽  
Johan De Keyser
Keyword(s):  
Seasonal Variations ◽  
Solar Zenith Angle ◽  
The Sun ◽  
Polar Ionosphere ◽  
Polar Cap ◽  
Polar Wind ◽  
Simple Set ◽  
The Earth ◽  
Rotation Of The Earth ◽  
Set Up

Abstract. The cold ions (energy less than several tens of electronvolts) flowing out from the polar ionosphere, called the polar wind, are an important source of plasma for the magnetosphere. The main source of energy driving the polar wind is solar illumination, which therefore has a large influence on the outflow. Observations have shown that solar illumination creates roughly two distinct regimes where the outflow from a sunlit ionosphere is higher than that from a dark one. The transition between both regimes is at a solar zenith angle larger than 90°. The rotation of the Earth and its orbit around the Sun causes the magnetic polar cap to move into and out of the sunlight. In this paper we use a simple set-up to study qualitatively the effects of these variations in solar illumination of the polar cap on the ion flux from the whole polar cap. We find that this flux exhibits diurnal and seasonal variations even when combining the flux from both hemispheres. In addition there are asymmetries between the outflows from the Northern Hemisphere and the Southern Hemisphere.

Response Time Optimisation of the Rankine Compression Gas Turbine (RCG)

2006 ◽  
Author(s):  
H. Ouwerkerk ◽  
H. C. de Lange
Keyword(s):  
Response Time ◽  
Gas Turbine ◽  
Combined Cycle ◽  
Short Response Time ◽  
Part Load ◽  
Full Load ◽  
Ship Propulsion ◽  
Power Turbine ◽  
New Type ◽  
Set Up

The Rankine Compression Gas turbine (RCG) is a new type of combined cycle that delivers all power on one free power turbine. With its free power turbine the intended fields of application of the RCG are mechanical drives and ship propulsion. For the RCG to become successful in these fields of application a short response time from part-load to full-load is vital. Experiments with an experimental set-up at the Technische Universiteit Eindhoven showed that the response time would benefit from after-spray and supplementary firing. Therefore, these items were implemented in an overdrive controller that was designed to accelerate the RCG cycle more quickly. Simulations showed that the overdrive controller dramatically reduces the response time of the modeled RCG-cycle in a transient from 50% part-load to full-load from 20 minutes down to about 2 minutes. This is an impressive improvement of the response time and is believed to make the RCG suitable for mechanical drives and ship propulsion.

The Art of Teaching: A Technique for Solving Simple “Set Up” Equations in One Unknown

1946 ◽  
Vol 39 (1) ◽  
pp. 35-38
Author(s):  
May L. Wilt
Keyword(s):  
First Year ◽  
Teaching Techniques ◽  
Simple Set ◽  
Starting Point ◽  
Ability Groups ◽  
Good Starting Point ◽  
Art Of Teaching ◽  
Set Up ◽  
One Year

No longer can teachers of mathematics be satisfied with the type of teaching that produces uncertain results. The first year of algebra is a good starting point for developing teaching techniques. Most children, who have had one year of algebra, can solve simple “set up” equations in one unknown if they are directed “what to do next.” They should be able to know “what to do next.” Very bright children find out for themselves, but the average and slower ability groups must be helped to develop a technique that will produce certainty and accuracy in results.

scholarly journals Improving the Response Performance of Anti-Surge Control Valve for Gas Compressors

2021 ◽  
Vol 6 (7) ◽  
pp. 62-68
Author(s):  
Haruna A. Ogweda ◽  
Joseph E. Okhaifoh
Keyword(s):  
Response Time ◽  
Great Improvement ◽  
Control Valve ◽  
Initial System ◽  
Design Modification ◽  
Average Percentage ◽  
Percentage Improvement ◽  
Surge Control ◽  
Response Performance ◽  
Set Up

Anti-surge control valves are used for the protection of gas compressors by opening to relief sudden pressures (surge) which could damage the compressor internals. It is of great importance that the response of the anti-surge valves to surge detection is swift and within a few seconds since a little delay could cause catastrophic damages to the compressor it is meant to protect. In this paper, a design modification was done on an existing anti-surge valve to improve its response time. The modified system was designed and implemented, installed, and commissioned on a mixed refrigerant compressor. The modified system was tested, and the response performance was recorded. Results obtained showed average percentage improvement of 86% to that of the initial system. Also, the response performance of the modified system was less than 3 seconds as compared to the initial set-up which averages 9 seconds. This is indeed a great improvement in comparison to the initial system.

scholarly journals Fair Insurance Premium Rate in Connected SEIR Model under Epidemic Outbreak

2021 ◽  
Author(s):  
Alexey Chernov ◽  
Aleksandr Shemendyuk ◽  
Mark Kelbert
Keyword(s):  
Equivalence Principle ◽  
Initial Distribution ◽  
Insurance Premium ◽  
Epidemic Outbreak ◽  
Migration Rates ◽  
Optimal Insurance ◽  
Premium Rate ◽  
Simple Set ◽  
Insurance Costs ◽  
Set Up

In this paper, we aim to determine an optimal insurance premium rate for health-care in deterministic and stochastic SEIR models. The studied models consider two standard SEIR centres characterised by migration fluxes and vaccination of population. The premium is calculated using the basic equivalence principle. Even in this simple set-up, there are non-intuitive results that illustrate how the premium depends on migration rates, the severity of a disease and the initial distribution of healthy and infected individuals through the centres. We investigate how the vaccination program affects the insurance costs by comparing the savings in benefits with the expenses for vaccination. We compare the results of deterministic and stochastic models.

scholarly journals A Leaf Selfie: Using a Smartphone to Quantify Leaf Vulnerability to Hydraulic Dysfunction

Plants ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 234 ◽  
Author(s):  
Francesco Petruzzellis ◽  
Martina Tomasella ◽  
Andrea Miotto ◽  
Sara Natale ◽  
Patrizia Trifilò ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Species Distribution ◽  
Tree Species ◽  
Climate Variables ◽  
Xylem Embolism ◽  
Climate Conditions ◽  
Simple Set ◽  
Set Up ◽  
Species Specific ◽  
Ostrya Carpinifolia

Accurate predictions of species distribution under current and future climate conditions require modeling efforts based on clear mechanistic relationships between climate variables and plant physiological functions. Vulnerability of leaves to xylem embolism is a key mechanistic trait that might be included in these modeling efforts. Here, we propose a simple set-up to measure leaf vulnerability to embolism on the basis of the optical method using a smartphone, a light source, and a notebook. Our data show that this proposed set-up can adequately quantify the vulnerability to xylem embolism of leaf major veins in Populus nigra and Ostrya carpinifolia, producing values consistent with those obtained in temperate tree species with other methods, allowing virtually any laboratory to quantify species-specific drought tolerance on the basis of a sound mechanistic trait.

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