Height-dependent meteor temperatures and comparisons with lidar and OH measurements

2007 ◽  
Vol 85 (2) ◽  
pp. 173-187 ◽  
Author(s):  
W K Hocking ◽  
P S Argall ◽  
R P Lowe ◽  
R J Sica ◽  
H Ellinor
Keyword(s):  
Good Accuracy ◽  
Sufficient Accuracy ◽  
New Method ◽  
Precise Knowledge ◽  
Rayleigh Lidar ◽  
Sky Conditions

A new method is introduced that allows meteor radars to potentially produce height-dependent temperatures, rather than simply averages over the meteor region. The method is applied to data from the Clovar radar, near London, Ontario, and then a three-way comparison between Rayleigh lidar temperatures, hydroxyl temperatures, and meteor temperatures is undertaken. The three methods prove to be complementary. The OH measurements have good accuracy, but suffer slightly from lack of precise knowledge about their height and the fact that they are effectively integrated over the depth of the OH layer. The lidar temperatures are measured at well-defined altitudes and have better accuracy than the meteor method. The meteor temperatures have the largest errors, but still provide sufficient accuracy for many types of atmospheric studies, and have the advantage that these measurements can be made 24 h a day and in all sky conditions (including during cloud and strong sunlight and moonlight). The measurements from these instruments are complementary in that they are useful for studying the temperature on different time and altitude scales. PACS No.: 94.10.Dy

scholarly journals A new method to derive middle atmospheric temperature profiles using a combination of Rayleigh lidar and O<sub>2</sub> airglow temperatures measurements

2012 ◽  
Vol 30 (1) ◽  
pp. 27-32 ◽  
Author(s):  
A. Taori ◽  
A. Jayaraman ◽  
K. Raghunath ◽  
V. Kamalakar
Keyword(s):  
Temperature Profile ◽  
Atmospheric Temperature ◽  
New Method ◽  
Temperature Profiles ◽  
Vertical Temperature ◽  
Lidar System ◽  
Mesospheric Temperature ◽  
Simultaneous Measurements ◽  
Rayleigh Lidar ◽  
First Time

Abstract. The vertical temperature profiles in a typical Rayleigh lidar system depends on the backscatter photon counts and the CIRA-86 model inputs. For the first time, we show that, by making simultaneous measurements of Rayleigh lidar and upper mesospheric O2 temperatures, the lidar capability can be enhanced to obtain mesospheric temperature profile up to about 95 km altitudes. The obtained results are compared with instantaneous space-borne SABER measurements for a validation.

scholarly journals The Evaluation of a New Method to Detect Mixing Layer Heights Using Lidar Observations

2015 ◽  
Vol 32 (11) ◽  
pp. 2041-2051 ◽  
Author(s):  
Micheal Hicks ◽  
Ricardo Sakai ◽  
Everette Joseph
Keyword(s):  
Hybrid Method ◽  
Detection Method ◽  
Error Function ◽  
Mixing Layer ◽  
New Method ◽  
Mixing Height ◽  
Critical Components ◽  
Sky Conditions ◽  
Aerosol Backscatter ◽  
Lidar Observations

AbstractA new automatic mixing layer height detection method for lidar observations of aerosol backscatter profiles is presented and evaluated for robustness. The new detection method incorporates the strengths of Steyn et al.’s error function–ideal profile (ERF) method and Davis et al.’s wavelet covariance transform (WCT) method. These two methods are critical components of the new method, and their robustness is also evaluated and then contrasted to the new method. The new method is applied to aerosol backscatter observations in two ways: 1) by looking for the most realistic mixing height throughout the entire profile and 2) by searching for mixing height below significant elevated obscurations (e.g., clouds or aerosol layers). The first approach is referred to as the hybrid method and the second as the hybrid-lowest method. Coincident radiosounding observations of mixing heights are used to independently reference the lidar-based estimates.There were 4030 cases examined over a 5-yr period for mixing heights. The efficacy of the lidar-based methods was determined based on diurnal, seasonal, stability, and sky obscuration conditions. Of these conditions, the hybrid method performed best for unstable and cloudy situations. It determined mixing heights reliably (less than ±0.30-km bias) for close to 70% of those cases. The hybrid-lowest method performed best in stable and clear-sky conditions; it determined mixing heights reliably for over 70% of those cases. The WCT method performed the best overall.

An Improved Algorithm of Linearization Localization Based on RSSI Ranging

2013 ◽  
Vol 299 ◽  
pp. 113-116 ◽  
Author(s):  
Lei Li ◽  
Hao Zhu
Keyword(s):  
Series Expansion ◽  
Taylor Series ◽  
Good Accuracy ◽  
Taylor Series Expansion ◽  
New Method ◽  
Iteration Algorithm ◽  
Localization Algorithm ◽  
The Real ◽  
Acceptable Accuracy ◽  
Improved Algorithm

The positioning technology has become one of the most popular studied objects since it has been implemented in many fields. With five reference nodes at least, linearization localization algorithm get an acceptable accuracy. With Taylor Series Expansion, we can overcome this shortcoming. First, we give the blind node an initial coordinate, then we expand the group of binary quadratic based on RSSI with Taylor Series at the point of initial coordinate, remove quadratic and higher, at last ,we apply iteration algorithm to estimate the real coordinate of blind node. Compared to the original, this new method can get a very good accuracy with only three reference nodes.

A new method for mechanical testing of thin films: Application to aluminum

2009 ◽  
Vol 24 (4) ◽  
pp. 1353-1360
Author(s):  
T. Kruml ◽  
M. Stranyanek ◽  
R. Ctvrtlik ◽  
P. Bohac ◽  
T. Vystavel ◽  
...  
Keyword(s):  
Thin Films ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Accurate Determination ◽  
Film Surface ◽  
Strain Curve ◽  
New Method ◽  
Plastic Properties ◽  
Precise Knowledge

A new method for measuring plastic properties of thin films deposited on a substrate is presented. Micrometric cylindrical specimens with the axis perpendicular to the film surface were prepared by milling out the surrounding material using the focused ion beam technique. Such specimens were deformed by means of a nanoindenter outfitted with a flat diamond tip. An equivalent to the macroscopic compressive curve was obtained. Elastic modulus and hardness of the film were then measured using a Berkovich tip. The precise knowledge of the gage length and the independent measurement of elastic properties enable the accurate determination of the stress–strain curve. As compared with the results published in the literature on the specimens with the same dimensions, the studied material deforms less heterogeneously, probably as a consequence of the symmetric crystallographic orientation of the specimens.

scholarly journals On a new method of estimating the aperture of stomata

1911 ◽  
Vol 84 (569) ◽  
pp. 136-154 ◽  
Keyword(s):  
Relative Humidity ◽  
Stomatal Aperture ◽  
New Method ◽  
Precise Knowledge ◽  
Principal Factors

It is usually assumed that transpiration is regulated by two principal factors: (1) the relative humidity of the air, and (2) the degree of aperture of the stomata. Neither of these assumptions has been experimentally proved, though both of them are necessarily true, but it must be remembered that the factors referred to are not necessarily the only ones that govern the phenomena. The experiments hitherto made on (1) the effect of relative humidity are vitiated by want of precise knowledge as to the stomatal aperture during the course of the enquiry.

Study on Setting the Initial Nodal Temperature on the Joint Face of Concrete Dam

2011 ◽  
Vol 94-96 ◽  
pp. 1596-1600
Author(s):  
You Ping Zhu ◽  
Shou Kai Chen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Field ◽  
Good Accuracy ◽  
New Method ◽  
Three Dimension ◽  
Concrete Dam ◽  
Field Simulation ◽  
Element Method

Because of lacking a rigid method of setting the initial nodal temperature on the joint face, the accuracy of temperature simulation would be affected in concrete dam. Based on finite element method (FEM) and principle of thermal conversation, we validate and extend a new method of setting the initial nodal temperature on the joint face in this paper. The result of temperature field simulation shows that this method has good accuracy in three-dimension temperature field simulation.

scholarly journals Daytime Cloud Detection Method Using the All-Sky Imager over PERMATApintar Observatory

Universe ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 41
Author(s):  
Mohammad Afiq Dzuan Mohd Azhar ◽  
Nurul Shazana Abdul Hamid ◽  
Wan Mohd Aimran Wan Mohd Kamil ◽  
Nor Sakinah Mohamad
Keyword(s):  
Detection Method ◽  
Color Difference ◽  
Database System ◽  
New Method ◽  
Cloud Detection ◽  
Cloud Coverage ◽  
B Method ◽  
Difference Methods ◽  
Sky Imager ◽  
Sky Conditions

In this study, we explored a new method of cloud detection called the Blue-Green (B-G) Color Difference, which is adapted from the widely used Red-Blue (R-B) Color Difference. The objective of this study was to test the effectiveness of these two methods in detecting daytime clouds. Three all-sky images were selected from a database system at PERMATApintar Observatory. Each selected all-sky image represented different sky conditions, namely clear, partially cloudy and overcast. Both methods were applied to all three images and compared in terms of cloud coverage detection. Our analysis revealed that both color difference methods were able to detect a thick cloud efficiently. However, the B-G was able to detect thin clouds better compared to the R-B method, resulting in a higher and more accurate cloud coverage detection.

The Assessment of Cranio-facial Angles Using Polarized Light

1979 ◽  
Vol 6 (4) ◽  
pp. 177-181
Author(s):  
C. J. Minors
Keyword(s):  
Polarized Light ◽  
Sufficient Accuracy ◽  
New Method ◽  
Preliminary Results ◽  
Further Development

A technique is described for measuring various angles used in orthodontic cephalometry without the use of radiography. This new method utilizes the properties of polarized light to transfer the data required from the patient to the apparatus, where it is stored and displayed electronically. Some preliminary results indicate that the method is potentially of sufficient accuracy to merit further development.

Rapid genotypic antibiotic susceptibility test using CRISPR-Cas12a for urinary tract infection

The Analyst ◽  
2020 ◽  
Vol 145 (15) ◽  
pp. 5226-5231
Author(s):  
Juhong Chen ◽  
Fuguo Jiang ◽  
Chao-Wei Huang ◽  
Liwei Lin
Keyword(s):  
Urinary Tract Infection ◽  
Urinary Tract ◽  
Tract Infection ◽  
Antibiotic Susceptibility ◽  
Good Accuracy ◽  
Susceptibility Test ◽  
New Method ◽  
Antibiotic Susceptibility Test

A new method based on the technique of CRISPR-Cas12a is developed to accomplish a bacterial antibiotic susceptibility test (AST) within one hour with good accuracy.

scholarly journals Comparison of different methods for extracting bone cross-sectional geometric properties from CT images

2013 ◽  
Vol 10 (2) ◽  
pp. 247-260 ◽  
Author(s):  
Sinisa Ilic ◽  
Sladjan Timotijevic ◽  
Dejan Lazovic ◽  
Petar Spalevic ◽  
Alempije Veljovic
Keyword(s):  
Cross Sections ◽  
Good Accuracy ◽  
Threshold Level ◽  
Ct Images ◽  
Sufficient Accuracy ◽  
The Body ◽  
Cross Sectional ◽  
Geometric Properties ◽  
Moments Of Inertia ◽  
External Forces

Analysis of the geometric properties of bone cross-sections is often used to determine skeletal performance and the ability of the body to resist different external forces. This analysis is dependent on obtaining adequate bone cross-sectional images. CT images can be used for this purpose by performing some pre-processing of images in order to achieve sufficient accuracy. In this paper we have used experiments to show that relatively good accuracy of bone cross sectional areas and moments of inertia can be achieved by simple threshold level filtering of CT images.

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