The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
Hans J. Schmitt - One of the best experts on this subject based on the ideXlab platform.
-
A new optical-fiber sensor for measuring Surface Pressure of Langmuir monolayers
"Sensors and Actuators A: Physical", 1995Co-Authors: Rong Zhu, Bernhard Scholl, Yu Wei, Hans J. SchmittAbstract:The Surface Pressure of Langmuir monolayers can be measured by a Langmuir balance or Wilhelmy plate. However, both of these sensors have a long contact length with the monolayer, normally longer than 10 mm. An optical-fiber sensor has been developed for the measurement of the Surface Pressure of monolayers. It has a short contact length with the monolayer, less than 250 μm, while the sensitivity of this method is still very high. Thus, the new sensor presents a small disturbance to the monolayer and is very suitable for the study of inhomogeneity problems of monolayers, which are very important for the application of such layers to optical and molecular electronic devices. In the discussion, the feasibility of the application of the new optical-fiber sensor to the atomic force microscope is also analyzed. © 1995, All rights reserved.
S. V. Singh - One of the best experts on this subject based on the ideXlab platform.
-
Variations of Surface Pressure over India during the southwest monsoon
Theoretical and Applied Climatology, 1991Co-Authors: S. G. Nagar, S. V. SinghAbstract:Intraseasonal and interannual variations of Surface Pressure and Surface Pressure anomalies are studied using 19 years of daily Surface Pressure data at 60 stations in India during the south-west monsoon season. The interannual variability of Surface Pressure is highest over northwest India and a ridge runs eastward near 23 °N. The spatial pattern of total daily intra-seasonal variations is similar to that of interannual variability. The seasonal cycle accounts for about 50% of the intraseasonal variance over northwest India. When the seasonal cycle is removed the high standard deviations are observed over the area adjoining the head of the Bay of Bengal where the frequency of occurrence of the intense cyclonic disturbances is highest. The area of maximum intraseasonal variability keeps shifting westward as one goes from June through to September. A harmonic analysis is performed to study the contribution to the variances by the 30–60 days and 10–20 days period ranges during excess and deficient monsoon years. EOF analysis of the 5-day mean Pressure anomaly fields is conducted to study the most dominant modes of variation. The evolutionary features of Surface Pressure fields are studied with the help of Hovmöller diagrams and EEOF analysis. The relationships between westward and northward progression of anomalies and their influence on monsoon conditions is also studied.
-
Variations of Surface Pressure over India during the southwest monsoon
Theoretical and Applied Climatology, 1991Co-Authors: S. G. Nagar, S. V. SinghAbstract:Intraseasonal and interannual variations of Surface Pressure and Surface Pressure anomalies are studied using 19 years of daily Surface Pressure data at 60 stations in India during the south-west monsoon season. The interannual variability of Surface Pressure is highest over northwest India and a ridge runs eastward near 23 °N. The spatial pattern of total daily intra-seasonal variations is similar to that of interannual variability. The seasonal cycle accounts for about 50% of the intraseasonal variance over northwest India. When the seasonal cycle is removed the high standard deviations are observed over the area adjoining the head of the Bay of Bengal where the frequency of occurrence of the intense cyclonic disturbances is highest. The area of maximum intraseasonal variability keeps shifting westward as one goes from June through to September.
Rabindra D Mehta - One of the best experts on this subject based on the ideXlab platform.
-
Surface Pressure measurements using luminescent coatings
Annual Review of Fluid Mechanics, 2003Co-Authors: James H Bell, Edward T Schairer, Lawrence A Hand, Rabindra D MehtaAbstract:▪ Abstract An optical technique is described that is often used nowadays to measure Surface Pressures on wind tunnel models and flight vehicles. The technique uses luminescent coatings, which are painted on the model Surface, excited by light of appropriate wavelength, and imaged with digital cameras. The intensity of the emitted light is inversely proportional to the Surface Pressure. Hence, the Surface Pressures can be measured efficiently and affordably with a high spatial resolution. The theory and chemistry of how such coatings work and the parameters that affect them are presented. The required hardware and software are described, with emphasis on the different measurement systems and procedures. The various error sources are discussed, and correction schemes that can be used to minimize them are presented. Sample results, covering a wide range of conditions and applications, are presented and discussed.
Rong Zhu - One of the best experts on this subject based on the ideXlab platform.
-
A new optical-fiber sensor for measuring Surface Pressure of Langmuir monolayers
"Sensors and Actuators A: Physical", 1995Co-Authors: Rong Zhu, Bernhard Scholl, Yu Wei, Hans J. SchmittAbstract:The Surface Pressure of Langmuir monolayers can be measured by a Langmuir balance or Wilhelmy plate. However, both of these sensors have a long contact length with the monolayer, normally longer than 10 mm. An optical-fiber sensor has been developed for the measurement of the Surface Pressure of monolayers. It has a short contact length with the monolayer, less than 250 μm, while the sensitivity of this method is still very high. Thus, the new sensor presents a small disturbance to the monolayer and is very suitable for the study of inhomogeneity problems of monolayers, which are very important for the application of such layers to optical and molecular electronic devices. In the discussion, the feasibility of the application of the new optical-fiber sensor to the atomic force microscope is also analyzed. © 1995, All rights reserved.
S. G. Nagar - One of the best experts on this subject based on the ideXlab platform.
-
Variations of Surface Pressure over India during the southwest monsoon
Theoretical and Applied Climatology, 1991Co-Authors: S. G. Nagar, S. V. SinghAbstract:Intraseasonal and interannual variations of Surface Pressure and Surface Pressure anomalies are studied using 19 years of daily Surface Pressure data at 60 stations in India during the south-west monsoon season. The interannual variability of Surface Pressure is highest over northwest India and a ridge runs eastward near 23 °N. The spatial pattern of total daily intra-seasonal variations is similar to that of interannual variability. The seasonal cycle accounts for about 50% of the intraseasonal variance over northwest India. When the seasonal cycle is removed the high standard deviations are observed over the area adjoining the head of the Bay of Bengal where the frequency of occurrence of the intense cyclonic disturbances is highest. The area of maximum intraseasonal variability keeps shifting westward as one goes from June through to September. A harmonic analysis is performed to study the contribution to the variances by the 30–60 days and 10–20 days period ranges during excess and deficient monsoon years. EOF analysis of the 5-day mean Pressure anomaly fields is conducted to study the most dominant modes of variation. The evolutionary features of Surface Pressure fields are studied with the help of Hovmöller diagrams and EEOF analysis. The relationships between westward and northward progression of anomalies and their influence on monsoon conditions is also studied.
-
Variations of Surface Pressure over India during the southwest monsoon
Theoretical and Applied Climatology, 1991Co-Authors: S. G. Nagar, S. V. SinghAbstract:Intraseasonal and interannual variations of Surface Pressure and Surface Pressure anomalies are studied using 19 years of daily Surface Pressure data at 60 stations in India during the south-west monsoon season. The interannual variability of Surface Pressure is highest over northwest India and a ridge runs eastward near 23 °N. The spatial pattern of total daily intra-seasonal variations is similar to that of interannual variability. The seasonal cycle accounts for about 50% of the intraseasonal variance over northwest India. When the seasonal cycle is removed the high standard deviations are observed over the area adjoining the head of the Bay of Bengal where the frequency of occurrence of the intense cyclonic disturbances is highest. The area of maximum intraseasonal variability keeps shifting westward as one goes from June through to September.
