Powered by Deep Web Technologies
Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

B61-12 Life Extension Program Radar Drop Tests Completed Successfully |  

NLE Websites -- All DOE Office Websites (Extended Search)

B61-12 Life Extension Program Radar Drop Tests Completed Successfully | B61-12 Life Extension Program Radar Drop Tests Completed Successfully | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > Media Room > Press Releases > B61-12 Life Extension Program Radar Drop Tests ... Press Release B61-12 Life Extension Program Radar Drop Tests Completed Successfully

2

B61-12 Life Extension Program Radar Drop Tests Completed Successfully...  

National Nuclear Security Administration (NNSA)

Aug 29, 2013 WASHINGTON, D.C. - As part of the ongoing effort to refurbish the aging B61 nuclear bomb without resorting to underground nuclear testing, two successful...

3

Comparison of Polarimetric Radar Drop Size Distribution Retrieval Algorithms  

Science Conference Proceedings (OSTI)

Recently, two physically based algorithms, the “beta” (?) method and the “constrained-gamma” method, have been proposed for retrieving the governing parameters of the gamma drop size distribution (DSD) from polarimetric radar measurements. The ? ...

Edward A. Brandes; Guifu Zhang; J. Vivekanandan

2004-04-01T23:59:59.000Z

4

Characteristics of Radar-Identified Big Drop Zones in Swiss Hailstorms  

Science Conference Proceedings (OSTI)

The characteristics of the so-called “radar-identified big drop zones” (rBDZ) have been investigated. The study employs radar observations of several thunderstorms and simultaneous microphysical and vertical wind measurements with a penetrating T-...

Albert Waldvogel; Laszlo Klein; Dennis J. Musil; Paul L. Smith

1987-08-01T23:59:59.000Z

5

An Evaluation of a Drop Distribution–Based Polarimetric Radar Rainfall Estimator  

Science Conference Proceedings (OSTI)

A method for estimating the governing parameters of gamma drop size distributions (DSDs) and associated rainfall rates from polarimetric radar measurements at the S band is examined. The technique uses radar reflectivity at horizontal ...

Edward A. Brandes; Guifu Zhang; J. Vivekanandan

2003-05-01T23:59:59.000Z

6

Doppler Polarimetric Radar Measurements of the Gamma Drop Size Distribution of Rain  

Science Conference Proceedings (OSTI)

The conversion of radar reflections into rain intensities is dependent upon assumptions regarding the drop size distribution. The gamma drop size distribution contains three unknown parameters; the number of parameters that can be obtained ...

H. W. J. Russchenberg

1993-12-01T23:59:59.000Z

7

Correction of Drop Shape-Induced Errors on Rain Rates Derived from Radar-Measured Doppler Spectra at Vertical Incidence  

Science Conference Proceedings (OSTI)

The shape of larger raindrops shows a deviation from spheres. This leads to a radar backscatter cross section different from the Rayleigh cross section. The drop shape-induced error for deducing rain rates is calculated. The resulting correction ...

Dirk Klugmann; Carolin Richter

1995-06-01T23:59:59.000Z

8

Coincident In Situ and W-Band Radar Measurements of Drop Size Distribution in a Marine Stratus Cloud and Drizzle  

Science Conference Proceedings (OSTI)

Investigation of precipitation formation requires measurements of the drop size distribution in a cloud. These measurements have usually been made using ground-based radar systems or aircraft in situ probes. Difficulties encountered in practice ...

J. Galloway; A. Pazmany; J. Mead; R. E. McIntosh; D. Leon; J. French; S. Haimov; R. Kelly; G. Vali

1999-05-01T23:59:59.000Z

9

Drop Size Distributions Measured by a 2D Video Disdrometer: Comparison with Dual-Polarization Radar Data  

Science Conference Proceedings (OSTI)

An analysis of drop size distributions (DSDs) measured in four very different precipitation regimes is presented and is compared with polarimetric radar measurements. The DSDs are measured by a 2D video disdrometer, which is designed to measure ...

Terry J. Schuur; Alexander V. Ryzhkov; Dusan S. Zrni?; Michael Schönhuber

2001-06-01T23:59:59.000Z

10

An Analysis of Errors in Drop Size Distribution Retrievals and Rain Bulk Parameters with a UHF Wind Profiling Radar and a Two-Dimensional Video Disdrometer  

Science Conference Proceedings (OSTI)

Vertically pointed wind profiling radars can be used to obtain measurements of the underlying drop size distribution (DSD) for a rain event by means of the Doppler velocity spectrum. Precipitation parameters such as rainfall rate, radar ...

Laura Kanofsky; Phillip Chilson

2008-12-01T23:59:59.000Z

11

Doppler Cloud Radar Derived Drop Size Distributions in Liquid Water Stratus Clouds  

Science Conference Proceedings (OSTI)

A cloud particle size retrieval algorithm that uses radar reflectivity factor and Doppler velocity obtained by a 35-GHz Doppler radar and liquid water path estimated from microwave radiometer radiance measurements is developed to infer the size ...

Seiji Kato; Gerald G. Mace; Eugene E. Clothiaux; James C. Liljegren; Richard T. Austin

2001-10-01T23:59:59.000Z

12

Frictionally induced ignition processes in drop and skid tests  

SciTech Connect

The standard LANL/Pantex drop and skid tests rely on subjective assessment of reaction violence to quantify the response of the charge, and completely miss nonpropagating hot-spot ignition sites. Additionally, large variations in test results have been observed, which we propose is due to a misunderstanding of the basic physical processes that lead to threshold ignition in these tests. The tests have been redesigned to provide control of these mechanisms and to permit direct observation of hot spots at the impact site, allowing us to follow the progression of the outcome as the drop height and ignition source density are varied. The results confirm that frictional interactions between high-melting-point solids are the dominant ignition mechanism, not just at the threshold, but in fact at all realistic drop heights.

Dickson, Peter [Los Alamos National Laboratory; Parker, Gary [Los Alamos National Laboratory; Novak, Alan [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

13

Transonic Pressure-- Sensing Studies Using Drop Test Vehicles  

SciTech Connect

Free-flight drop vehicle tests have been made to investigate devices for measuring ambient pressure in the vicinity of a high-fineness-ratio weapon shape throughout the transonic speed range. Various types of nose probes and trailing probes were tested.

Pepper, W.B., Jr. [Organization 5141

1954-05-01T23:59:59.000Z

14

Comparison of Drop Size Distribution Parameter (D0) and Rain Rate from S-Band Dual-Polarized Ground Radar, TRMM Precipitation Radar (PR), and Combined PR–TMI: Two Events from Kwajalein Atoll  

Science Conference Proceedings (OSTI)

The estimation of the drop size distribution parameter [median volume diameter (D0)] and rain rate (R) from the Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) as well as from combined PR–TRMM Microwave Imager (TMI) algorithms ...

V. N. Bringi; Gwo-Jong Huang; S. Joseph Munchak; Christian D. Kummerow; David A. Marks; David B. Wolff

2012-11-01T23:59:59.000Z

15

Drop Tests for the 6M Specification Package Closure Investigation  

SciTech Connect

Results of tests of drum-type RAM packages employing conventional clamp-ring closures have caused concern within the DOE Complex over the Department of Transportation 6M Specification Package. To clarify these issues, the Savannah River Site's Radioactive Material Packaging Technology Group was commissioned to conduct a series of tests to determine the response of the clamp-ring closure to the regulatory Hypothetical Accident Condition drop tests, for packages at maximum allowable weight, 640 lb. Additionally, three enhanced closure designs were also tested: the Clamshell, plywood disk reinforcement, and J-Clip. The results of the tests showed that the standard closure was unable to retain its lid for both Center-of-Gravity-Over-Corner and Shallow-Angle cases, for the standard package, at its maximum allowed weight. Similar results were found for packages dropped from a reduced height. The Clamshell design provided the best performance of the enhanced closures.

Smith, A.C.

2003-10-02T23:59:59.000Z

16

Drop Shapes, Model Comparisons, and Calculations of Polarimetric Radar Parameters in Rain  

Science Conference Proceedings (OSTI)

Drop shapes derived from a previously conducted artificial rain experiment using a two-dimensional video disdrometer (2DVD) are presented. The experiment involved drops falling over a distance of 80 m to achieve their terminal velocities as well ...

M. Thurai; G. J. Huang; V. N. Bringi; W. L. Randeu; M. Schönhuber

2007-06-01T23:59:59.000Z

17

Drop Size Ambiguities in the Retrieval of Precipitation Profiles from Dual-Frequency Radar Measurements  

Science Conference Proceedings (OSTI)

The threat of flooding from landfalling tropical cyclones is a function of the local variation in rain rate and rain accumulation. To date, these have been inferred from single-frequency radar reflectivity measurements. However, the Tropical ...

Ziad S. Haddad; Jonathan P. Meagher; Stephen L. Durden; Eric A. Smith; Eastwood Im

2006-01-01T23:59:59.000Z

18

Effects of Drop-Size-Distribution Truncation on Computer Simulations of Dual-Measurement Radar Methods  

Science Conference Proceedings (OSTI)

An investigation is made of the effects of truncating the raindrop-size distribution at minimum and maximum diameters on the results of computer simulations of dual-measurement radar methods. The dual-measurement methods investigated include ...

Carlton W. Ulbrich

1992-07-01T23:59:59.000Z

19

Polarimetric Radar Rain Estimation through Retrieval of Drop Size Distribution Using a Bayesian Approach  

Science Conference Proceedings (OSTI)

This study proposes a Bayesian approach to retrieve raindrop size distributions (DSDs) and to estimate rainfall rates from radar reflectivity in horizontal polarization ZH and differential reflectivity ZDR. With this approach, the authors apply a ...

Qing Cao; Guifu Zhang; Edward A. Brandes; Terry J. Schuur

2010-05-01T23:59:59.000Z

20

Drop Tests for the 6M Specification Package Closure Investigation  

SciTech Connect

Results of tests of drum-type RAM packages employing conventional clamp-ring closures have caused concern over the DOT 6M Specification Package. To clarify these issues, a series of tests were performed to determine the response of the clamp-ring closure to the regulatory Hypothetical Accident Condition (9m) drop tests, for packages at maximum allowable weight. Three enhanced closure designs were also tested: the Clamshell, plywood disk reinforcement, and J-Clip. The results of the tests showed that the standard closure was unable to retain the top for both Center-of-Gravity-Over-Corner and Shallow Angle cases, for the standard package, at its maximum allowed weight. Similar results were found for packages dropped from a reduced height. The Clamshell design provided the best performance of the enhanced closures. It was concluded that the closure ring design employed on the 6M is inadequate to retain the top during the regulatory test sequence, for packages at the maximum allowed weight. For large heavy packages, the Center-of-Gravity- Over-Corner case is more challenging than the Shallow Angle case. The Clamshell design securely retained the top for all HAC test cases, and prevented formation of any opening which could compromise fire test performance.

SMITH, AC

2004-04-30T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Drop Tests of 325 Pound 6M Specification Packages  

Science Conference Proceedings (OSTI)

Testing of 6M specification packages, performed in response to concerns over the integrity of the clamp-ring closure, showed that the clamp-ring was unable to retain the top in thirty foot drop tests of packages having the maximum allowed weight (290 kg or 640 lb). To determine if the clamp-ring closure was adequate for packages with lower contents weight, a series of tests were performed on packages weighing 147 kg (325 lb) at a range of impact angles. The results showed that the standard clamp-ring closure was unable to retain the top in tests of standard 6M packages weighing 147 kg (325 lb). A test employing a plywood disk enhanced closure with impact at 6.5 degrees retained its top successfully.

SMITH, AC

2004-04-30T23:59:59.000Z

22

Absolute Calibration of Radar Reflectivity Using Redundancy of the Polarization Observations and Implied Constraints on Drop Shapes  

Science Conference Proceedings (OSTI)

A major limitation of improved radar-based rainfall estimation is accurate calibration of radar reflectivity. In this paper, the authors fully automate a polarimetric method that uses the consistency between radar reflectivity, differential ...

Jonathan J. Gourley; Anthony J. Illingworth; Pierre Tabary

2009-04-01T23:59:59.000Z

23

Estimating the Accuracy of Polarimetric Radar–Based Retrievals of Drop-Size Distribution Parameters and Rain Rate: An Application of Error Variance Separation Using Radar-Derived Spatial Correlations  

Science Conference Proceedings (OSTI)

The accuracy of retrieving the two drop size distribution (DSD) parameters, median volume diameter (D0), and normalized intercept parameter (NW), as well as rain rate (R), from polarimetric C-band radar data obtained during a cool-season, long-...

M. Thurai; V. N. Bringi; L. D. Carey; P. Gatlin; E. Schultz; W. A. Petersen

2012-06-01T23:59:59.000Z

24

Spatially Variable Advection Correction of Radar Data. Part II: Test Results  

Science Conference Proceedings (OSTI)

The spatially variable advection-correction/analysis procedure introduced in Part I is tested using analytical reflectivity blobs embedded in a solid-body vortex, and Terminal Doppler Weather Radar (TDWR) and Weather Surveillance Radar-1988 ...

Alan Shapiro; Katherine M. Willingham; Corey K. Potvin

2010-11-01T23:59:59.000Z

25

Characteristics of the Raindrop Size Distribution and Drop Shape Relation in Typhoon Systems in the Western Pacific from the 2D Video Disdrometer and NCU C-Band Polarimetric Radar  

Science Conference Proceedings (OSTI)

The drop size distribution (DSD) and drop shape relation (DSR) characteristics that were observed by a ground-based 2D video disdrometer and retrieved from a C-band polarimetric radar in the typhoon systems during landfall in the western Pacific, ...

Wei-Yu Chang; Tai-Chi Chen Wang; Pay-Liam Lin

2009-10-01T23:59:59.000Z

26

Drop Test Results for the Combustion Engineering Model No. ABB-2901 Fuel Pellet Package  

SciTech Connect

The U.S. Nuclear Regulatory Commission (USNRC) contracted with the Packaging Review Group (PRG) at Lawrence Livermore National Laboratory (LLNL) to conduct a single, 30-ft shallow-angle drop test on the Combustion Engineering ABB-2901 drum-type shipping package. The purpose of the test was to determine if bolted-ring drum closures could fail during shallow-angle drops. The PRG at LLNL planned the test, and Defense Technologies Engineering Division (DTED) personnel from LLNL's Site-300 Test Group executed the plan. The test was conducted in November 2001 using the drop-tower facility at LLNL's Site 300. Two representatives from Westinghouse Electric Company in Columbia, South Carolina (WEC-SC); two USNRC staff members; and three PRG members from LLNL witnessed the preliminary test runs and the final test. The single test clearly demonstrated the vulnerability of the bolted-ring drum closure to shallow-angle drops-the test package's drum closure was easily and totally separated from the drum package. The results of the preliminary test runs and the 30-ft shallow-angle drop test offer valuable qualitative understandings of the shallow-angle impact.

Hafner, R S; Mok, G C; Hagler, L G

2004-04-23T23:59:59.000Z

27

Combined Use of the Radar and Radiometer of TRMM to Estimate the Influence of Drop Size Distribution on Rain Retrievals  

Science Conference Proceedings (OSTI)

A combination of passive microwave and radar observations from the Tropical Rainfall Measuring Mission (TRMM) satellite is used to investigate the consistency between the two sensors. Rather than relying on some absolute “truth” to verify ...

Nicolas Viltard; Christian Kummerow; William S. Olson; Ye Hong

2000-12-01T23:59:59.000Z

28

CPOL Radar-Derived Drop Size Distribution Statistics of Stratiform and Convective Rain for Two Regimes in Darwin, Australia  

Science Conference Proceedings (OSTI)

This note builds on prior technique development related to the classification of rain types utilizing C-band polarimetric (CPOL) radar measurements. While the prior work was preliminary and limited in scope, the authors elaborate here on the ...

M. Thurai; V. N. Bringi; P. T. May

2010-05-01T23:59:59.000Z

29

Tests of Four PT-415 Coolers Installed in the Drop-in Mode  

DOE Green Energy (OSTI)

The superconducting magnets and absorbers for MICE will be cooled using PT415 pulse tube coolers. The cooler 2nd stage will be connected to magnets and the absorbers through a helium or hydrogen re-condensing system. It was proposed that the coolers be connected to the magnets in such a way that the cooler can be easily installed and removed, which permits the magnets to be shipped without the coolers. The drop-in mode requires that the cooler 1st stage be well connected to the magnet shields and leads through a low temperature drop demountable connection. The results of the PT415 drop-in cooler tests are presented.

Green, Michael A.; Wang, S.T.

2008-07-08T23:59:59.000Z

30

Test of a Staggered PRT Scheme for the French Radar Network  

Science Conference Proceedings (OSTI)

This paper describes the test of a staggered PRT scheme for the French radar network. The design of the staggered scheme has been done in the following context: 1) the scheme is meant to be implemented on existing C-band and S-band radars of the ...

P. Tabary; L. Perier; J. Gagneux; J. Parent-du-Chatelet

2005-04-01T23:59:59.000Z

31

Feasibility Test of an Airborne Pulse-Doppler Meteorological Radar  

Science Conference Proceedings (OSTI)

A vertically scanning, airborne, pulse-Doppler radar is described. Data processing methods to yield pseudo-dual-Doppler horizontal winds are presented. Results of an intercomparison with a ground-based dual-Doppler network are presented and ...

David P. Jorgensen; Peter H. Hildebrand; Charles L. Frush

1983-05-01T23:59:59.000Z

32

An Efficient Dual-Resolution Approach for Ensemble Data Assimilation and Tests with Simulated Doppler Radar Data  

Science Conference Proceedings (OSTI)

A new efficient dual-resolution (DR) data assimilation algorithm is developed based on the ensemble Kalman filter (EnKF) method and tested using simulated radar radial velocity data for a supercell storm. Radar observations are assimilated on ...

Jidong Gao; Ming Xue

2008-03-01T23:59:59.000Z

33

Sources of Errors in Rainfall Measurements by Polarimetric Radar: Variability of Drop Size Distributions, Observational Noise, and Variation of Relationships between R and Polarimetric Parameters  

Science Conference Proceedings (OSTI)

Using a set of long-term disdrometric data and of actual radar measurements from the McGill S-band operational polarimetric radar, several sources of errors in rain measurement with polarimetric radar are explored in order to investigate their ...

Gyu Won Lee

2006-08-01T23:59:59.000Z

34

Syracuse Univesity Test Report On Uptake Factor Resulting From A Dropped Storage Container - Phase II  

Science Conference Proceedings (OSTI)

Under certain circumstances, powder from an accidently dropped container can become airborne and inhaled by people nearby such as those who are moving the containers. The inhaled fine particles can deposit on respiratory tracts and lungs, causing asthma, lung cancer, and other acute respiratory illnesses and chronic symptoms. The objective of this study was to develop a standard procedure to measure the airborne concentrations of different size particles within the vicinity of a dropped container where a significant portion of the contained powder is ejected. Tungsten oxide (WO{sub 3}) was selected in this study to represent relatively heavy powders (7.16 g/cm3 specific gravity for WO{sub 3}). A typical can with the outer dimensions of 4.25” diameter and 4.875” tall was used as the container. The powder was dropped in two different configurations: 1) contained within a can covered by a lid that has a 0.25” diameter hole, and 2) contained within a can without a lid. The packing volume of the powder was 51.4 in3 (842.7 cm{sup 3}) and the target mass was 1936 g. The tests were carried out in a full-scale stainless steel environmental chamber with an interior volume of 852 ft3 (24.1 m3). The chamber system includes an internal recirculation loop with a rectangular air diffuser and 10 variable frequency drive fans to provide a typical room air recirculation flow pattern. Two air filters were installed in the chamber air supply duct and return duct to achieve the required low background particle concentration. The initial chamber air conditions were set at 70°F (± 5°F) and 50% (± 10%) RH. A supporting frame and releasing device were designed and built to trigger consistently the dropping of the can. The particle sampling inlet was placed 5 ft above the floor and 6 inches laterally away from the can’s falling path. Concentrations of particles between 0.5 ?m and 20 ?m were recorded in units of mass and number of particles per unit volume. The data acquisition rate was once every 2 seconds during the first 2 hours. A test procedure was developed and verified. A total of thirty two drop tests were performed, eight in Phase I and twenty four in Phase II, covering variations in dropping height (8 ft or 4 ft from the floor), room air movement (0.25-0.30 m/s or 0.10-0.15 m/s near the ceiling), landing scenario (on a flat plate or a block), and lid condition (¼” lid hole or no lid). There were ten tests with flat plate and ¼” lid hole, ten tests with flat plate no lid and twelve tests with block no lid.

Gao, Zhi; Zhang, Jianshun S.

2012-01-01T23:59:59.000Z

35

A Class of Single- and Dual-Frequency Algorithms for Rain-Rate Profiling from a Spaceborne Radar. Part II: Tests from Airborne Radar Measurements  

Science Conference Proceedings (OSTI)

In Part I, four single-frequency (SF) algorithms and a dual-frequency (DF) algorithm for range profiling of the rain rate from a spaceborne radar were described and tested from numerical simulations. In Part II, performances of these algorithms ...

Paul Amayenc; Jean Philippe Diguet; Mongi Marzoug; Taoufik Tani

1996-02-01T23:59:59.000Z

36

Development of Correlations for Pressure Loss/Drop Coefficients Obtained From Flow Testing of Fuel Assemblies in Framatome ANP's PHTF  

SciTech Connect

Thermal-hydraulic analyses of pressurized water reactor (PWR) and boiling water reactor (BWR) fuel assemblies are generally performed for either assembly thermal-hydraulic design, thermal-hydraulic compatibility evaluation, or cycle licensing thermal-hydraulic characterization. A key issue in all cases is the hydraulic resistance characterization of the assembly in which the assembly, its components and support plates, etc., are represented by their respective pressure loss and pressure drop coefficients. These hydraulic coefficients can be determined by single-phase flow testing in an experimental facility such as the Framatome ANP Portable Hydraulic Test Facility (PHTF) located at Richland Test Facilities (RTF) in Richland, WA. The goal of this paper is to present a uniform and consistent methodology for the development of coefficient correlations from data obtained from single phase pressure drop testing of PWR and BWR fuel assemblies and their components performed in the PHTF. This methodology reflects the years of accumulated experience from an existing facility with an ongoing test program. (authors)

Madni, Imtiaz K.; Stephens, Lance G.; Turner, Dave M. [Framatome ANP Inc. (United States)

2002-07-01T23:59:59.000Z

37

Statistical Tools for Drop Size Distributions: Moments and Generalized Gamma  

Science Conference Proceedings (OSTI)

Several problems associated with drop size distributions are treated. For rainfall rate R or radar reflectivity Z high powers of the drop diameters must be taken into account. This paper suggests methods to deal with the relevant moments and to ...

A. N. Aufder Maur

2001-02-01T23:59:59.000Z

38

Axis Ratios of Water Drops Levitated in a Vertical Wind Tunnel  

Science Conference Proceedings (OSTI)

The shapes of falling raindrops are often significantly altered by drop oscillations, complicating dual-polarization radar methods that rely on a predictable, monotonic variation of drop axis ratio ? with equivolume drop diameter d. This ...

B. K. Jones; J. R. Saylor

2009-11-01T23:59:59.000Z

39

Testing IWC Retrieval Methods Using Radar and Ancillary Measurements with In Situ Data  

Science Conference Proceedings (OSTI)

Vertical profiles of ice water content (IWC) can now be derived globally from spaceborne cloud satellite radar (CloudSat) data. Integrating these data with Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) data may ...

Andrew J. Heymsfield; Alain Protat; Dominique Bouniol; Richard T. Austin; Robin J. Hogan; Julien Delanoë; Hajime Okamoto; Kaori Sato; Gerd-Jan van Zadelhoff; David P. Donovan; Zhien Wang

2008-01-01T23:59:59.000Z

40

Comparison of Dual-Polarization Radar Estimators of Rain  

Science Conference Proceedings (OSTI)

Several polarimetric radar estimators of rain rate R and rainwater content M are examined. The accuracy of the estimators is analyzed using a gamma drop size distribution (DSD) simulation and a radar wavelength of 11 cm. The estimators that use ...

A. V. Ryzhkov; D. S. Zrni?

1995-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Very Early Formation of Big, Liquid Drops Revealed by ZDR in Continental Cumulus  

Science Conference Proceedings (OSTI)

Examination of the early radar echo histories of several vigorous, cumulus clouds in northeast Colorado and northwest Kansas, with sensitive, dual-polarization radar, reveals the formation of millimeter-sized water drops at about the same time ...

Charles A. Knight

2006-07-01T23:59:59.000Z

42

Radar Data Assimilation with WRF 4D-Var. Part I: System Development and Preliminary Testing  

Science Conference Proceedings (OSTI)

The major goal of this two-part study is to assimilate radar data into the high-resolution Advanced Research Weather Research and Forecasting Model (ARW-WRF) for the improvement of short-term quantitative precipitation forecasting (QPF) using a ...

Hongli Wang; Juanzhen Sun; Xin Zhang; Xiang-Yu Huang; Thomas Auligné

2013-07-01T23:59:59.000Z

43

A Variational Scheme for Retrieving Rainfall Rate and Hail Reflectivity Fraction from Polarization Radar  

Science Conference Proceedings (OSTI)

Polarization radar offers the promise of much more accurate rainfall-rate R estimates than are possible from radar reflectivity factor Z alone, not only by better characterization of the drop size distribution, but also by more reliable ...

Robin J. Hogan

2007-10-01T23:59:59.000Z

44

ARM - Measurement - Radar Doppler  

NLE Websites -- All DOE Office Websites (Extended Search)

W-Band (95 GHz) ARM Cloud Radar MMCR : Millimeter Wavelength Cloud Radar RWP : Radar Wind Profiler 50RWP : Radar Wind Profiler (50 MHz) WACR : W-Band (95 GHz) ARM Cloud Radar...

45

Experimental Tests of Methods for the Measurement of Rainfall Rate Using an Airborne Dual-Wavelength Radar  

Science Conference Proceedings (OSTI)

For a spaceborne meteorological radar, the use of frequencies above 10 GHz may be necessary to attain sufficient spatial resolution. As the frequency increases, however, attenuation by rain becomes significant. To extend the range of rain rates ...

R. Meneghini; K. Nakamura; C. W. Ulbrich; D. Atlas

1989-08-01T23:59:59.000Z

46

Sensitivity of Convective Initiation Prediction to Near-Surface Moisture When Assimilating Radar Refractivity: Impact Tests Using OSSEs  

Science Conference Proceedings (OSTI)

The Advanced Regional Prediction System (ARPS) three-dimensional variational (3DVAR) system is enhanced to include the analysis of radar-derived refractivity measurements. These refractivity data are most sensitive to atmospheric moisture content ...

Nicholas A. Gasperoni; Ming Xue; Robert D. Palmer; Jidong Gao

2013-10-01T23:59:59.000Z

47

Experimental study of a R-407C drop-in test on an off-the-shelf air conditioner with a counter-cross-flow evaporator  

SciTech Connect

An off-the-shelf 2-ton window air conditioner having an energy efficiency ratio of 10 was used to perform a drop-in test with R-407C. Laboratory tests were performed using a parallel-cross-flow (PCF) evaporator and a counter-cross-flow (CCF) evaporator. The CCF configuration is designed to take advantage of the temperature glide of R-407C so that the warm evaporator inlet air will be in contact with the higher temperature part of the evaporator coils first. The test results indicated that, at the Air Conditioning and Refrigeration Institute-rated indoor and outdoor conditions, the cooling capacity was 8% higher and system coefficient of performance about 3.8% higher for the CCF evaporator than for the PCF evaporator. The test results also showed that the latent load for CCF was 30.6% higher than for PCF. The far better dehumidification effect provided by the CCF evaporator design is desirable for areas where the latent load is high. The experimental findings should be useful for future efforts to design a dehumidifier that uses a zeotropic refrigerant that provides a significant temperature glide. R-22 test data from a previous project are included as a reference.

Mei, V.C.; Domitrovic, R.; Chen, F.C.

1998-03-01T23:59:59.000Z

48

Ion-Drop Interaction During Drop Evaporation  

Science Conference Proceedings (OSTI)

As a basic experiment in warm cloud electrification, evaporating large drops were studied as they floated in an ion-rich environment in a vertical wind tunnel. The drops were found to acquire a positive charge during their evaporation, a result ...

Tsutomu Takahashi; Tatsuo Endoh

1983-02-01T23:59:59.000Z

49

The Added Value of Surface Data to Radar-Derived Rainfall-Rate Estimation Using an Artificial Neural Network  

Science Conference Proceedings (OSTI)

Radar measurements are useful for determining rainfall rates because of their ability to cover large areas. Unfortunately, estimating rainfall rates from radar reflectivity data alone is prone to errors resulting from variations in drop size ...

B. Root; T-Y. Yu; M. Yeary; M. B. Richman

2010-09-01T23:59:59.000Z

50

An Experimental Test of a Theoretical Model to Determine the Rate at which Freely Falling Water Drops Scavenge SO2 in Air  

Science Conference Proceedings (OSTI)

An experimental method involving the UCLA Rain Shaft is described. This method allows determining the rate at which SO2 is scavenged from air by freely falling water drops. In the present experiment water drops of radii near 300 ?m were allowed ...

C. Walcek; P. K. Wang; J. H. Topalian; S. K. Mitra; H. R. Pruppacher

1981-04-01T23:59:59.000Z

51

Tests of Rain Profiling Algorithms for a Spaceborne Radar Using Raincell Models and Real Data Precipitation Fields  

Science Conference Proceedings (OSTI)

This paper compares the performances of several algorithms for profiling the rain rate from a spaceborne radar. Three techniques are considered: single frequency (or SF) at 13.8, or 24 GHz; dual frequency (or DF) at 13.8 and 24 GHz; and dual beam ...

Jacques Testud; Paul Amayenc; Xiankang Dou; Taoufix Tani

1996-04-01T23:59:59.000Z

52

Modeling the Variability of Drop Size Distributions in Space and Time  

Science Conference Proceedings (OSTI)

The information on the time variability of drop size distributions (DSDs) as seen by a disdrometer is used to illustrate the structure of uncertainty in radar estimates of precipitation. Based on this, a method to generate the space–time ...

Gyu Won Lee; Alan W. Seed; Isztar Zawadzki

2007-06-01T23:59:59.000Z

53

Temperature Fitting Method Predicting Equidistant Voltage Drop of ...  

Science Conference Proceedings (OSTI)

High Temperature Compression Test to Determine the Anode Paste ... Temperature Fitting Method Predicting Equidistant Voltage Drop of Anode Nod in  ...

54

Acoustic Radar Studies of Rain Microphysics  

Science Conference Proceedings (OSTI)

Raindrop size distributions are obtained from the Doppler frequency spectrum of an acoustic radar. Number concentrations of 12 drop diameters with a minimum diameter 0.14 cm are obtained and averaged over 3–15 min at 20-m range gates from 20 to ...

S. G. Bradley

1997-06-01T23:59:59.000Z

55

Retrieval of Cloud Microphysical Parameters from 94-GHz Radar Doppler Power Spectra  

Science Conference Proceedings (OSTI)

A technique is presented that uses Doppler spectra collected from a vertically pointing 94-GHz radar to reconstruct cloud and precipitation drop size distributions. A conceptual model describing the broadening of Doppler spectra by turbulence was ...

David M. Babb; Johannes Verlinde; Bruce A. Albrecht

1999-05-01T23:59:59.000Z

56

A Study of Embryo Production and Hail Growth Using Dual-Doppler and Multiparameter Radars  

Science Conference Proceedings (OSTI)

The origin and importance to embryo and hail production of a region of drops advected above the freezing level in the updraft of a severe Colorado hailstorm is examined using radar polarization measurements in conjunction with dual-Doppler and ...

John W. Conway; Dušan S. Zrni?

1993-09-01T23:59:59.000Z

57

Variational Optimization Method for Calculation of Cloud Drop Growth in an Eulerian Drop-Size Framework  

Science Conference Proceedings (OSTI)

A variational optimization (VO) method that requires specification of only one variable in each bin size for condensation and evaporation calculations in an Eulerian drop-size framework is proposed. The method is tested against the exact solution ...

Qingfu Liu; Yefim L. Kogan; Douglas K. Lilly; Marat P. Khairoutdinov

1997-10-01T23:59:59.000Z

58

Three-Dimensional Air Circulation in a Squall Line from Airborne Dual-Beam Doppler Radar Data: A Test of Coplane Methodology Software  

Science Conference Proceedings (OSTI)

The detailed structure of a tropical squall line observed in central Florida was investigated from an airborne dual-beam Doppler radar, pointing respectively fore and aft. This allowed dual-Doppler observations from a straight flight path in a ...

Michel Chong; Jacques Testud

1996-02-01T23:59:59.000Z

59

First drop dissimilarity in drop-on-demand inkjet devices  

SciTech Connect

As inkjet printing technology is increasingly applied in a broader array of applications, careful characterization of its method of use is critical due to its inherent sensitivity. A common operational mode in inkjet technology known as drop-on-demand ejection is used as a way to deliver a controlled quantity of material to a precise location on a target. This method of operation allows ejection of individual or a sequence (burst) of drops based on a timed trigger event. This work presents an examination of sequences of drops as they are ejected, indicating a number of phenomena that must be considered when designing a drop-on-demand inkjet system. These phenomena appear to be driven by differences between the first ejected drop in a burst and those that follow it and result in a break-down of the linear relationship expected between driving amplitude and drop mass. This first drop, as quantified by high-speed videography and subsequent image analysis, can be different in morphology, trajectory, velocity, and volume from subsequent drops within a burst. These findings were confirmed orthogonally by both volume and mass measurement techniques which allowed quantitation down to single drops.

Famili, Amin; Palkar, Saurabh A.; Baldy, William J. Jr. [Cordis Corporation, a Johnson and Johnson Company, Welsh and McKean Roads, Spring House, Pennsylvania 19477 (United States)

2011-01-15T23:59:59.000Z

60

Test of the Specific Differential Propagation Phase Shift (KDP) Technique for Rain-Rate Estimation with a Ku-Band Rain Radar  

Science Conference Proceedings (OSTI)

The variation in drop size distribution (DSD) and the attenuation at higher frequencies are the two major impairments for quantitative rain-rate estimation. The sensitivity of rain-rate estimators (such as reflectivity factor Z, differential ...

K. Isiah Timothy; Toshio Iguchi; Yuji Ohsaki; Hiroaki Horie; Hiroshi Hanado; Hiroshi Kumagai

1999-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Theoretical Analysis and Meteorological Interpretation of the Role of Raindrop Shape on Microwave Attenuation and Propagation Phase Shifts: Implication for the Radar Measurement of Rain  

Science Conference Proceedings (OSTI)

In rain radars can measure various powers of the drop diameter averaged over the drop size distribution. These averages can then be used to infer rain water content (W) or the rainfall rate in still air (R0). Besides being sensitive to drop sizes ...

A. R. Jameson

1989-02-01T23:59:59.000Z

62

Radar | Open Energy Information  

Open Energy Info (EERE)

Radar Radar Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Radar Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Remote Sensing Techniques Exploration Sub Group: Active Sensors Parent Exploration Technique: Active Sensors Information Provided by Technique Lithology: Stratigraphic/Structural: Detect fault and ground movement Hydrological: Can give indications about subsurface geothermal fluid flow Thermal: Dictionary.png Radar: Radar is an active-sensor remote sensing tool used to detect small changes in ground movement at geothermal locations. Other definitions:Wikipedia Reegle Introduction RAdio Detection And Ranging (RADAR) is used in a wide variety of applications. In remote sensing applications, the source of the radio waves

63

A Class of Single- and Dual-Frequency Algorithms for Rain-Rate Profiling from a Spaceborne Radar. Pad I: Principle and Tests from Numerical Simulations  

Science Conference Proceedings (OSTI)

A class of single- and dual-frequency algorithms that can be used to infer rain-rate profile from a downward-looking spaceborne radar operating at attenuating frequencies is presented. These algorithms rely on use of power-law relations between ...

Mongi Marzoug; Paul Amayenc

1994-12-01T23:59:59.000Z

64

The Joint Polarization Experiment: Polarimetric Radar in Forecasting and Warning Decision Making  

Science Conference Proceedings (OSTI)

To test the utility and added value of polarimetric radar products in an operational environment, data from the Norman, Oklahoma (KOUN), polarimetric Weather Surveillance Radar-1988 Doppler (WSR-88D) were delivered to the National Weather Service ...

Kevin A. Scharfenberg; Daniel J. Miller; Terry J. Schuur; Paul T. Schlatter; Scott E. Giangrande; Valery M. Melnikov; Donald W. Burgess; David L. Andra Jr.; Michael P. Foster; John M. Krause

2005-10-01T23:59:59.000Z

65

Case Studies of the Vertical Velocity Seen by the Flatland Radar Compared with Indirectly Computed Values  

Science Conference Proceedings (OSTI)

The hypothesis that temporal averages of vertical motions over a single radar station are representative of weather systems large enough to be resolved by the radiosonde network is tested using data from the Flatland VHF radar, located in the ...

G. D. Nastrom; W. L. Clark; K. S. Gage; T. E. VanZandt; J. M. Warnock; R. Creasey; P. M. Pauley

1994-02-01T23:59:59.000Z

66

Heat transfer and pressure drop in tape generated swirl flow  

E-Print Network (OSTI)

The heat transfer and pressure drop characteristics of water in tape generated swirl flow were investigated. The test sections were electrically heated small diameter nickel tubes with tight fitting full length Inconel ...

Lopina, Robert F.

1967-01-01T23:59:59.000Z

67

A 35-GHz Scanning Doppler Radar for Fog Observations  

Science Conference Proceedings (OSTI)

To observe fog, a 35-GHz scanning Doppler radar was designed, assembled, and tested. The radar, mounted on a flatbed vehicle for portability, transmits peak powers of 100 kW in a pulse of 0.5-µs width and a beamwidth of 0.3°. Thus, a reflectivity ...

Kyosuke Hamazu; Hiroyuki Hashiguchi; Toshio Wakayama; Tomoya Matsuda; Richard J. Doviak; Shoichiro Fukao

2003-07-01T23:59:59.000Z

68

Diesel prices see slight drop  

U.S. Energy Information Administration (EIA) Indexed Site

Diesel prices see slight drop The U.S. average retail price for on-highway diesel fuel fell slightly to 3.91 a gallon on Monday. That's down 6-tenths of a penny from a week ago,...

69

Synthetic Aperture Radar Interferometry  

E-Print Network (OSTI)

Synthetic aperture radar interferometry is an imaging technique for measuring the topography of a surface, its changes over time, and other changes in the detailed characteristics of the surface. By exploiting the phase of the coherent radar signal, interferometry has transformed radar remote sensing from a largely interpretive science to a quantitative tool, with applications in cartography, geodesy, land cover characterization, and natural hazards. This paper reviews the techniques of interferometry, systems and limitations, and applications in a rapidly growing area of science and engineering.

Paul A. Rosen; Scott Hensley; Ian R. Joughin; Fuk K. Li; Søren N. Madsen; Senior Member; Ernesto Rodríguez; Richard M. Goldstein

2000-01-01T23:59:59.000Z

70

Synthetic Aperture Radar -- Sandia National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

Information Contacts Synthetic Aperture Radar Sandia synthetic aperture radar image of Washington, DC Sandia synthetic aperture radar image of Washington, DC Sandia synthetic...

71

Pig shipping container test sequence  

SciTech Connect

This test plan outlines testing of the integrity of the pig shipping container. It is divided into four sections: (1) drop test requirements; (2) test preparations; (3) perform drop test; and (4) post-test examination.

Adkins, H.E. Jr.

1995-01-13T23:59:59.000Z

72

Pressure Drops Due to Silica Scaling  

DOE Green Energy (OSTI)

Experience with reinjection returns in many geothermal fields has prompted a move towards injecting waste fluids at some distance from the production field. This means that often, reinjection pipelines cover very long distances. If the waste water in the pipelines is supersaturated with respect to amorphous silica, then the deposition of silica in these pipelines is almost certain. Although the deposit may be of negligible thickness, the inner surface characteristics of the pipe will be different to those of clean mild steel. During a silica scaling experiment. geothermal brine was passed through a series of pipes of different sizes and over a period of three weeks, silica scale formed on the inner surface. The pressure drop along a distance of approximately 5m was measured by a water manometer in all test pipe sections. Significant pressure drop was observed during this time and can be correlated with the increase in the friction factor of the pipe walls due to silica scaling.

Brown, K.L.; Freeston, D.H.; Dimas, Z.O.; Slatter, A.

1995-01-01T23:59:59.000Z

73

Downhole pulse radar  

DOE Patents (OSTI)

A borehole logging tool generates a fast rise-time, short duration, high peak-power radar pulse having broad energy distribution between 30 MHz and 300 MHz through a directional transmitting and receiving antennas having barium titanate in the electromagnetically active region to reduce the wavelength to within an order of magnitude of the diameter of the antenna. Radar returns from geological discontinuities are sampled for transmission uphole. 7 figs.

Chang, Hsi-Tien

1987-09-28T23:59:59.000Z

74

Downhole pulse radar  

DOE Patents (OSTI)

A borehole logging tool generates a fast rise-time, short duration, high peak-power radar pulse having broad energy distribution between 30 MHz and 300 MHz through a directional transmitting and receiving antennas having barium titanate in the electromagnetically active region to reduce the wavelength to within an order of magnitude of the diameter of the antenna. Radar returns from geological discontinuities are sampled for transmission uphole.

Chang, Hsi-Tien (Albuquerque, NM)

1989-01-01T23:59:59.000Z

75

Microphysical Interpretation of Multi-Parameter Radar Measurements in Rain. Part II: Estimation of Raindrop Distribution Parameters by Combined Dual-Wavelength and Polarization Measurements  

Science Conference Proceedings (OSTI)

The radar reflectivity weighted mean axis ratio R¯ and the variance of the axis ratio distribution ?R2 of an ensemble of raindrops can be estimated from polarization radar measurements. If the shape function relating axis ratio to drop size is ...

A. R. Jameson

1983-07-01T23:59:59.000Z

76

Radar remote sensing of the lower atmosphere  

E-Print Network (OSTI)

on the observed radar clutter power. Marine ducts and theiron observed radar clutter power. Marine ducts and their

Karimian, Ali

2012-01-01T23:59:59.000Z

77

The CASA Integrated Project 1 Networked Radar System  

Science Conference Proceedings (OSTI)

This paper describes the Collaborative Adaptive Sensing of the Atmosphere (CASA) Integrated Project 1 (IP1) weather radar network, the first distributed collaborative adaptive sensing test bed of the Engineering Research Center for Collaborative ...

Francesc Junyent; V. Chandrasekar; D. McLaughlin; E. Insanic; N. Bharadwaj

2010-01-01T23:59:59.000Z

78

Doppler Radar Observations of Mammatus  

Science Conference Proceedings (OSTI)

Observations of mammatus-like cloud features associated with a convective rain shower were obtained using a vertically pointing 8-mm-wavelength Doppler radar. The radar's excellent sensitivity and resolution allowed even very weak, finescale ...

Brooks E. Martner

1995-10-01T23:59:59.000Z

79

A Physically Based Radar Simulator  

Science Conference Proceedings (OSTI)

There is a growing use of multiparameter radars for observation of the atmosphere and, in particular, for remote sensing of rain. Radar systems have the undeniable advantage of being able to monitor very large areas with a single installation in ...

Carlo Capsoni; Michele D’Amico

1998-04-01T23:59:59.000Z

80

ARM - Measurement - Radar polarization  

NLE Websites -- All DOE Office Websites (Extended Search)

polarization polarization ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Radar polarization The temporal and geometric behavior of the electric field vector of an electromagnetic wave transmitted or received by a radar system, e.g. elliptical polarization, differential reflectivity, phase shift, co-polar correlation coefficient, linear depolarization ratio. Categories Cloud Properties Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments CSAPR : C-Band ARM Precipitation Radar

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Definition: Radar | Open Energy Information  

Open Energy Info (EERE)

Radar Radar Jump to: navigation, search Dictionary.png Radar Radar is an active-sensor remote sensing tool used to detect small changes in ground movement at geothermal locations. View on Wikipedia Wikipedia Definition Radar is an object detection system which uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The radar dish or antenna transmits pulses of radio waves or microwaves which bounce off any object in their path. The object returns a tiny part of the wave's energy to a dish or antenna which is usually located at the same site as the transmitter. Radar was secretly developed by several nations before and

82

A Comparison of Radar Reflectivity Estimates of Rainfall from Collocated Radars  

Science Conference Proceedings (OSTI)

Radar reflectivity–based rainfall estimates from collocated radars are examined. The usual large storm-to-storm variations in radar bias and high correlation between radar estimates and rain gauge observations are found. For three storms in ...

Edward A. Brandes; J. Vivekanandan; James W. Wilson

1999-09-01T23:59:59.000Z

83

Drag and drop display & builder  

SciTech Connect

The Drag and Drop (DnD) Display & Builder is a component-oriented system that allows users to create visual representations of data received from data acquisition systems. It is an upgrade of a Synoptic Display mechanism used at Fermilab since 2002. Components can be graphically arranged and logically interconnected in the web-startable Project Builder. Projects can be either lightweight AJAX- and SVG-based web pages, or they can be started as Java applications. The new version was initiated as a response to discussions between the LHC Controls Group and Fermilab.

Bolshakov, Timofei B.; Petrov, Andrey D.; /Fermilab

2007-12-01T23:59:59.000Z

84

Impact Dynamics of Oxidized Liquid Metal Drops  

E-Print Network (OSTI)

With exposure to air, many liquid metals spontaneously generate an oxide layer on their surface. In oscillatory rheological tests, this skin is found to introduce a yield stress that typically dominates the elastic response but can be tuned by exposing the metal to hydrochloric acid solutions of different concentration. We systematically studied the normal impact of eutectic gallium-indium (eGaIn) drops under different oxidation conditions and show how this leads to two different dynamical regimes. At low impact velocity (or low Weber number), eGaIn droplets display strong recoil and rebound from the impacted surface when the oxide layer is removed. In addition, the degree of drop deformation or spreading during the impact is controlled by the oxide skin. We show that the scaling law known from ordinary liquids for the maximum spreading radius as a function of impact velocity can still be applied to the case of oxidized eGaIn if an effective Weber number $We^{\\star}$ is employed that uses an effective surface...

Xu, Qin; Jaeger, Heinrich M

2013-01-01T23:59:59.000Z

85

The Operational Weather Radar Network in Europe  

Science Conference Proceedings (OSTI)

The operational weather radar network in Europe covers more than 30 countries and contains more than 200 weather radars. The radar network is heterogeneous in hardware, signal processing, transmit/receive frequency, and scanning strategy, thus making it ...

Asko Huuskonen; Elena Saltikoff; Iwan Holleman

86

Tornado Damage Estimation Using Polarimetric Radar  

Science Conference Proceedings (OSTI)

This study investigates the use of tornadic debris signature (TDS) parameters to estimate tornado damage severity using Norman, Oklahoma (KOUN), polarimetric radar data (polarimetric version of the Weather Surveillance Radar-1988 Doppler radar). ...

David J. Bodine; Matthew R. Kumjian; Robert D. Palmer; Pamela L. Heinselman; Alexander V. Ryzhkov

2013-02-01T23:59:59.000Z

87

Assimilation of Simulated Polarimetric Radar Data for a Convective Storm Using the Ensemble Kalman Filter. Part I: Observation Operators for Reflectivity and Polarimetric Variables  

Science Conference Proceedings (OSTI)

A radar simulator for polarimetric radar variables, including reflectivities at horizontal and vertical polarizations, the differential reflectivity, and the specific differential phase, has been developed. This simulator serves as a test bed for ...

Youngsun Jung; Guifu Zhang; Ming Xue

2008-06-01T23:59:59.000Z

88

Millimeter Wave Cloud Radar (MMCR) Handbook  

SciTech Connect

The millimeter cloud radar (MMCR) systems probe the extent and composition of clouds at millimeter wavelengths. The MMCR is a zenith-pointing radar that operates at a frequency of 35 GHz. The main purpose of this radar is to determine cloud boundaries (e.g., cloud bottoms and tops). This radar will also report radar reflectivity (dBZ) of the atmosphere up to 20 km. The radar possesses a doppler capability that will allow the measurement of cloud constituent vertical velocities.

KB Widener; K Johnson

2005-01-30T23:59:59.000Z

89

How Radar Works | Open Energy Information  

Open Energy Info (EERE)

2013 DOI Not Provided Check for DOI availability: http:crossref.org Online Internet link for How Radar Works Citation Institute For Geophysics. How Radar Works...

90

Magnetically focused liquid drop radiator  

DOE Patents (OSTI)

A magnetically focused liquid drop radiator for application in rejecting energy from a spacecraft, characterized by a magnetizable liquid or slurry disposed in operative relationship within the liquid droplet generator and its fluid delivery system, in combination with magnetic means disposed in operative relationship around a liquid droplet collector of the LDR. The magnetic means are effective to focus streams of droplets directed from the generator toward the collector, thereby to assure that essentially all of the droplets are directed into the collector, even though some of the streams may be misdirected as they leave the generator. The magnetic focusing means is also effective to suppress splashing of liquid when the droplets impinge on the collector.

Botts, T.E.; Powell, J.R.; Lenard, R.

1984-12-10T23:59:59.000Z

91

Ultrasonic radar and its applications  

Science Conference Proceedings (OSTI)

A rangefinder is a device that measures distance from the observer to a target, for the purposes of surveying, determining focus in photography, or accurately aiming a weapon. Some devices use active methods to measure (such as sonar, laser, or radar); ... Keywords: PIC, radar, rangefinder, surveying, target, ultrasonic, weapon

Mansoor-Ul-Hassan Siddique

2009-08-01T23:59:59.000Z

92

A Marine Radar Wind Sensor  

Science Conference Proceedings (OSTI)

A new method for retrieving the wind vector from radar-image sequences is presented. This method, called WiRAR, uses a marine X-band radar to analyze the backscatter of the ocean surface in space and time with respect to surface winds. Wind ...

Heiko Dankert; Jochen Horstmann

2007-09-01T23:59:59.000Z

93

Colloidal Shape Effects in Evaporating Drops  

E-Print Network (OSTI)

We explore the influence of particle shape on the behavior of evaporating drops. A first set of experiments discovered that particle shape modifies particle deposition after drying. For sessile drops, spheres are deposited in a ring-like stain, while ellipsoids are deposited uniformly. Experiments elucidate the kinetics of ellipsoids and spheres at the drop's edge. A second set of experiments examined evaporating drops confined between glass plates. In this case, colloidal particles coat the ribbon-like air-water interface, forming colloidal monolayer membranes (CMMs). As particle anisotropy increases, CMM bending rigidity was found to increase, which in turn introduces a new mechanism that produces a uniform deposition of ellipsoids and a heterogeneous deposition of spheres after drying. A final set of experiments investigates the effect of surfactants in evaporating drops. The radially outward flow that pushes particles to the drop's edge also pushes surfactants to the drop's edge, which leads to a radially inward flow on the drop surface. The presence of radially outward flows in the bulk fluid and radially inward flows at the drop surface creates a Marangoni eddy, among other effects, which also modifies deposition after drying.

Peter J. Yunker; Tim Still; A. G. Yodh

2013-08-08T23:59:59.000Z

94

Delamination initiation in postbuckled dropped-ply laminates  

Science Conference Proceedings (OSTI)

The compression strength of dropped-ply, graphite-epoxy laminated plates for the delamination mode of failure is studied by analysis and corroborated with experiments. The nonlinear response of the test specimens is modeled by a geometrically nonlinear finite-element analysis. The methodology for predicting delamination is based on a quadratic interlaminar stress criterion evaluated at a characteristic distance from the ply drop-off. The details of the complex state of stress in the region of the thickness discontinuity are studied using three-dimensional solid elements, while the uniform sections of the plate are modeled with quadrilateral shell elements. A geometrically nonlinear transition element was developed to couple the shell elements to the solid elements. Uniaxial compression testing of dropped-ply, graphite-epoxy laminated plates confirmed that delamination among the interfaces above and/or below the dropped plies is a common mode of failure initiation. The compression strength of specimens exhibiting a linear response is greater than the compression strength of specimens with the same layup exhibiting geometrically nonlinear response.

Davila, C.G.

1991-01-01T23:59:59.000Z

95

ARM Climate Research Facility Radar Operations Plan  

SciTech Connect

Roles, responsibilities, and processes associated with Atmospheric Radiation Measurement (ARM) Radar Operations.

Voyles, JW

2012-05-18T23:59:59.000Z

96

Improved Drop Generators for Calibration of Drop Spectrometers and Use in Laboratory Cloud Physics Experiments  

Science Conference Proceedings (OSTI)

Drop generators have been developed at NCAR based on the “wire egression” principle. They are outstanding in their flexibility and simplicity. Drops ranging in diameter from 6 ?m to 1 mm have been generated with one model. Application of the ...

Theodore W. Cannon; Walter W. Grotewold

1980-07-01T23:59:59.000Z

97

Ensemble Kalman Filter Assimilation of Doppler Radar Data with a Compressible Nonhydrostatic Model: OSS Experiments  

Science Conference Proceedings (OSTI)

A Doppler radar data assimilation system is developed based on an ensemble Kalman filter (EnKF) method and tested with simulated radar data from a supercell storm. As a first implementation, it is assumed that the forward models are perfect and ...

Mingjing Tong; Ming Xue

2005-07-01T23:59:59.000Z

98

Measured Collection Efficiencies for Cloud Drops  

Science Conference Proceedings (OSTI)

The collection efficiency has been measured for 15 size pairs of relatively uncharged drops in over 400 experimental runs. The results indicate that collection efficiencies fall in a narrow range of 0.60 to 0.70 even though the collector drop was ...

K. V. Beard; Harry T. Ochs III

1983-01-01T23:59:59.000Z

99

The Atmospheric Imaging Radar: Simultaneous Volumetric Observations Using a Phased Array Weather Radar  

Science Conference Proceedings (OSTI)

Mobile weather radars often utilize rapid-scan strategies when collecting observations of severe weather. Various techniques have been used to improve volume update times, including the use of agile and multibeam radars. Imaging radars, similar in ...

Bradley Isom; Robert Palmer; Redmond Kelley; John Meier; David Bodine; Mark Yeary; Boon-Leng Cheong; Yan Zhang; Tian-You Yu; Michael I. Biggerstaff

2013-04-01T23:59:59.000Z

100

Effects of Radar Beam Shielding on Rainfall Estimation for the Polarimetric C-Band Radar  

Science Conference Proceedings (OSTI)

Radar reflectivity (Zh), differential reflectivity (Zdr), and specific differential phase (Kdp) measured from the operational, polarimetric weather radar located in Trappes, France, were used to examine the effects of radar beam shielding on ...

Katja Friedrich; Urs Germann; Jonathan J. Gourley; Pierre Tabary

2007-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Polarimetry for Weather Surveillance Radars  

Science Conference Proceedings (OSTI)

This paper is an overview of weather radar polarimetry emphasizing surveillance applications. The following potential benefits to operations are identified: improvement of quantitative precipitation measurements, discrimination of hail from rain ...

Dusan S. Zrnic; Alexander V. Ryzhkov

1999-03-01T23:59:59.000Z

102

Radar Reflectivity of Cumulus Clouds  

Science Conference Proceedings (OSTI)

The relationships between the radar reflectivity factor Z and significant physical cloud parameters are studied from a dataset collected with an instrumented aircraft in non- or very weakly precipitating warm clouds. The cloud droplet populations ...

Henri Sauvageot; Jilani Omar

1987-06-01T23:59:59.000Z

103

Radar Calibration: Some Simple Approaches  

Science Conference Proceedings (OSTI)

The proper calibration of weather radars has been at the heart of the problem of accurate reflectivity measurements for more than five decades. This paper summarizes a number of methods that have been used previously and others that areworthy of ...

David Atlas

2002-09-01T23:59:59.000Z

104

STRESS CORROSION CRACKING IN TEAR DROP SPECIMENS  

SciTech Connect

Laboratory tests were conducted to investigate the stress corrosion cracking (SCC) of 304L stainless steel used to construct the containment vessels for the storage of plutonium-bearing materials. The tear drop corrosion specimens each with an autogenous weld in the center were placed in contact with moist plutonium oxide and chloride salt mixtures. Cracking was found in two of the specimens in the heat affected zone (HAZ) at the apex area. Finite element analysis was performed to simulate the specimen fabrication for determining the internal stress which caused SCC to occur. It was found that the tensile stress at the crack initiation site was about 30% lower than the highest stress which had been shifted to the shoulders of the specimen due to the specimen fabrication process. This finding appears to indicate that the SCC initiation took place in favor of the possibly weaker weld/base metal interface at a sufficiently high level of background stress. The base material, even subject to a higher tensile stress, was not cracked. The relieving of tensile stress due to SCC initiation and growth in the HAZ and the weld might have foreclosed the potential for cracking at the specimen shoulders where higher stress was found.

Lam, P; Philip Zapp, P; Jonathan Duffey, J; Kerry Dunn, K

2009-05-01T23:59:59.000Z

105

Rain Attenuation of Radar Echoes Considering Finite-Range Resolution and Using Drop Size Distributions  

Science Conference Proceedings (OSTI)

The classical rain attenuation correction scheme of Hitschfeld and Bordan (HIBO) and the newer iterative approach by Hildebrand (HL) are reconsidered. Although the motivation for the HL algorithm was an extension into ranges, where HIBO tends to ...

Gerhard Peters; Bernd Fischer; Marco Clemens

2010-05-01T23:59:59.000Z

106

Sensitivity of 5-cm Wavelength Polarimetric Radar Variables to Raindrop Axial Ratio and Drop Size Distribution  

Science Conference Proceedings (OSTI)

The sensitivity of polarimetric variables at a 5-cm wavelength to raindrop size and axial ratio is examined using T-matrix modeling of the scattering process for gamma raindrop size distributions fitted to tropical rainfall collected at Darwin, ...

T. D. Keenan; L. D. Carey; D. S. Zrni?; P. T. May

2001-03-01T23:59:59.000Z

107

The Shape of Averaged Drop Size Distributions  

Science Conference Proceedings (OSTI)

The shape of averaged drop size distributions (DSD) is studied from a large sample of data (892 h) collected at several sites of various latitudes. The results show that neither the hypothesis of an exponential distribution to represent rainfall ...

Henri Sauvageot; Jean-Pierre Lacaux

1995-04-01T23:59:59.000Z

108

An Automated Cloud-Edge Detection Algorithm Using Cloud Physics and Radar Data  

Science Conference Proceedings (OSTI)

An automated cloud-edge detection algorithm was developed and extensively tested. The algorithm uses in situ cloud physics data measured by a research aircraft coupled with ground-based weather radar measurements to determine whether the aircraft ...

Jennifer G. Ward; Francis J. Merceret

2004-05-01T23:59:59.000Z

109

Optimal Control Theory Applied to an Objective Analysis of a Tidal Current Mapping by HF Radar  

Science Conference Proceedings (OSTI)

Optimal control can provide a tool to perform an optimization of a tidal model via a data assimilation operation. A pilot study is presented here to test the theoretical and numerical feasibility of an assimilation of HF radar current ...

Jean-Luc Devenon

1990-04-01T23:59:59.000Z

110

Cirrus Cloud Ice Water Content Radar Algorithm Evaluation Using an Explicit Cloud Microphysical Model  

Science Conference Proceedings (OSTI)

A series of cirrus cloud simulations performed using a model with explicit cloud microphysics is applied to testing ice water content retrieval algorithms based on millimeter-wave radar reflectivity measurements. The simulated ice particle size ...

Kenneth Sassen; Zhien Wang; Vitaly I. Khvorostyanov; Graeme L. Stephens; Angela Bennedetti

2002-06-01T23:59:59.000Z

111

Climatological Characterization of Three-Dimensional Storm Structure from Operational Radar and Rain Gauge Data  

Science Conference Proceedings (OSTI)

Three algorithms extract information on precipitation type, structure, and amount from operational radar and rain gauge data. Tests on one month of data from one site show that the algorithms perform accurately and provide products that ...

Matthias Steiner; Robert A. Houze Jr.; Sandra E. Yuter

1995-09-01T23:59:59.000Z

112

Least Squares Retrieval of Microburst Winds from Single-Doppler Radar Data  

Science Conference Proceedings (OSTI)

A least squares (LS) method is developed for retrieving low-altitude winds from single-Doppler radar scans. The method is tested with Denver airport microburst data and the results compared with the previously developed simple adjoint (SA) ...

Chong-Jian Qiu; Qin Xu

1996-06-01T23:59:59.000Z

113

The 10-cm-Wavelength Polarimetric Weather Radar at NOAA's National Severe Storms Laboratory  

Science Conference Proceedings (OSTI)

The NSSL Doppler radar has been upgraded to include polarimetric measurements and remote operations. We discuss details of thew upgrades and specifics concerning real-time computations of polarimetric variables. Tests and calibrations have proven ...

A. Zahrai; D. S. Zrni?

1993-10-01T23:59:59.000Z

114

Definition: Synthetic Aperture Radar | Open Energy Information  

Open Energy Info (EERE)

Aperture Radar Aperture Radar Jump to: navigation, search Dictionary.png Synthetic Aperture Radar Synthetic-aperture radar (SAR) is an active microwave remote sensing technology that measures the phase difference between a radar wave emitted from an antennae attached to a satellite or aircraft to generate high-resolution images of a surface.[1] View on Wikipedia Wikipedia Definition Also Known As SAR Related Terms radar References ↑ Synthetic Aperature Radar: Systems and Signal Processing (Curlander and McDonough - 1991 - book) fue LikeLike UnlikeLike You like this.Sign Up to see what your friends like. l cell, Retrieved from "http://en.openei.org/w/index.php?title=Definition:Synthetic_Aperture_Radar&oldid=493069" Category: Definitions What links here Related changes

115

Definition: Interferometric Synthetic Aperture Radar | Open Energy  

Open Energy Info (EERE)

Interferometric Synthetic Aperture Radar Interferometric Synthetic Aperture Radar Jump to: navigation, search Dictionary.png Interferometric Synthetic Aperture Radar Interferometric Synthetic Aperture Radar (InSAR) utilizes SAR images from two different time periods to generate maps of surface deformation. The technique can potentially measure millimeter-scale changes in the Earth's surface.[1][2] View on Wikipedia Wikipedia Definition Also Known As InSAR, IfSAR Related Terms Synthetic Aperture Radar, radar, sustainability References ↑ Synthetic Aperture Radar Interferometry to Measure Earth's Surface Topography and Its Deformation (Burgmann et al. 2000) ↑ Improved Visulaization of Satellite Radar InSAR Observed Structural Controls at Producing Geothermal Field Using Modeled Horizontal Surface Displacements(Opplinger et al. 2006)

116

A Bistatic Multiple-Doppler Radar Network  

Science Conference Proceedings (OSTI)

A multiple-Doppler radar network can be constructed using only one, traditional, transmitting pencil-beam radar and one or more passive, low-gain, nontransmitting receivers at remote sites. Radiation scattered from the pencil beam of the ...

Joshua Wurman; Stanley Heckman; Dennis Boccippio

1993-12-01T23:59:59.000Z

117

Radar Detection of Turbulence in Precipitation Environments  

Science Conference Proceedings (OSTI)

Imperfect particle tracer response is incorporated into the relations describing the turbulent air motion contribution to Doppler radar spectrum mean and variance. Tracer effects on radar estimates of the eddy dissipation rate (?) increase with ...

Alan R. Bohne

1982-08-01T23:59:59.000Z

118

Understanding Radar Refractivity: Sources of Uncertainty  

Science Conference Proceedings (OSTI)

This study presents a 2-yr-long comparison of Weather Surveillance Radar-1988 Doppler (WSR-88D) refractivity retrievals with Oklahoma Mesonetwork (“Mesonet”) and sounding measurements and discusses some challenges to implementing radar ...

David Bodine; Dan Michaud; Robert D. Palmer; Pamela L. Heinselman; Jerry Brotzge; Nick Gasperoni; Boon Leng Cheong; Ming Xue; Jidong Gao

2011-12-01T23:59:59.000Z

119

Airborne Doppler Radar Data Analysis Workshop  

Science Conference Proceedings (OSTI)

The Airborne Doppler Radar Data Analysis Workshop, sponsored by the Atmospheric Technology Division (ATD) of the National Center for Atmospheric Research (NCAR), was the first to focus on analyzing airborne Doppler radar data. The workshop (held ...

Wen-Chau Lee; Frank D. Marks; Craig Walther

2003-08-01T23:59:59.000Z

120

Doppler Radar Sampling Limitations in Convective Storms  

Science Conference Proceedings (OSTI)

Vertical air motion data from a T-28 aircraft were filtered and sampled to simulate Doppler radar measurements. The results suggest that multiple Doppler radar analyses are subject to potentially large spatial aliasing errors in deep convection ...

R. E. Carbone; M. J. Carpenter; C. D. Burghart

1985-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Obstacle penetrating dynamic radar imaging system  

DOE Patents (OSTI)

An obstacle penetrating dynamic radar imaging system for the detection, tracking, and imaging of an individual, animal, or object comprising a multiplicity of low power ultra wideband radar units that produce a set of return radar signals from the individual, animal, or object, and a processing system for said set of return radar signals for detection, tracking, and imaging of the individual, animal, or object. The system provides a radar video system for detecting and tracking an individual, animal, or object by producing a set of return radar signals from the individual, animal, or object with a multiplicity of low power ultra wideband radar units, and processing said set of return radar signals for detecting and tracking of the individual, animal, or object.

Romero, Carlos E. (Livermore, CA); Zumstein, James E. (Livermore, CA); Chang, John T. (Danville, CA); Leach, Jr.. Richard R. (Castro Valley, CA)

2006-12-12T23:59:59.000Z

122

Optimal Planning of a Weather Radar Network  

Science Conference Proceedings (OSTI)

An approach to the optimal planning of a weather radar network is presented. In the approach, several aspects affecting the planning decision, including terrain blockage, the need to measure with two Doppler weather radars in some regions, and ...

R. Minciardi; R. Sacile; F. Siccardi

2003-09-01T23:59:59.000Z

123

Synthetic Aperture Radar Imagery -- Sandia National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

Synthetic Aperture Radar Imagery Sandia has collected and real-time processed over 400,000 synthetic aperture radar images. The following is a selection of imagery available for...

124

Operational Application of Meteorological Doppler Radar  

Science Conference Proceedings (OSTI)

Single Doppler weather radar velocity and reflectivity fields have been obtained with the National Center for Atmospheric Research (NCAR) 5 cm radars for a wide variety of weather situations. Among those weather features that can be identified by ...

James Wilson; Richard Carbone; Harold Baynton; Robert Serafin

1980-10-01T23:59:59.000Z

125

Scanning ARM Cloud Radar Handbook  

SciTech Connect

The scanning ARM cloud radar (SACR) is a polarimetric Doppler radar consisting of three different radar designs based on operating frequency. These are designated as follows: (1) X-band SACR (X-SACR); (2) Ka-band SACR (Ka-SACR); and (3) W-band SACR (W-SACR). There are two SACRs on a single pedestal at each site where SACRs are deployed. The selection of the operating frequencies at each deployed site is predominantly determined by atmospheric attenuation at the site. Because RF attenuation increases with atmospheric water vapor content, ARM's Tropical Western Pacific (TWP) sites use the X-/Ka-band frequency pair. The Southern Great Plains (SGP) and North Slope of Alaska (NSA) sites field the Ka-/W-band frequency pair. One ARM Mobile Facility (AMF1) has a Ka/W-SACR and the other (AMF2) has a X/Ka-SACR.

Widener, K; Bharadwaj, N; Johnson, K

2012-06-18T23:59:59.000Z

126

ARMAR: An Airborne Rain-Mapping Radar  

Science Conference Proceedings (OSTI)

A new airborne rain-mapping radar (ARMAR) has been developed by NASA and the Jet Propulsion Laboratory for operation on the NASA Ames DC-8 aircraft. The radar operates at 13.8 GHz, the frequency to be used by the radar on the Tropical Rainfall ...

S. L. Durden; E. Im; F. K. Li; W. Ricketts; A. Tanner; W. Wilson

1994-06-01T23:59:59.000Z

127

Lifetime of oil drops pressed by buoyancy against a planar interface: Large drops  

E-Print Network (OSTI)

In a previous report [10] it was shown that emulsion stability simulations are able to reproduce the lifetime of micrometer-size drops of hexadecane pressed by buoyancy against a planar water-hexadecane interface. It was confirmed that small drops (rioil stabilized with bovine serum albumin. The potential obtained is then employed to study the lifetime of deformable drops in the range 10 \\leq ri \\leq 1000 {\\mu}m. It is established that the average lifetime of these drops can be adequately replicated using the model of truncated spheres. However, the results depend sensibly on the expressions of the initial distance of deformation and the maximum film radius used in the calculations. The set of equations adequate for large drops is not satisfactory for medium-size drops (10 \\leq ri \\leq 100 {\\mu}m), and vice versa. In the case of large particles, the increase in the interfacial area as a consequence of the deformation of the drops generates a very large repulsive barrier which opposes coalescence. Nevertheless, the buoyancy force prevails. As a consequence, it is the hydrodynamic tensor of the drops which determine the characteristic behavior of the lifetime as a function of the particle size. While the average values of the coalescence time of the drops can be justified by the mechanism of film thinning, the scattering of the experimental data of large drops cannot be rationalized using the methodology previously described. A possible explanation of this phenomenon required elaborate simulations which combine deformable drops, capillary waves, repulsive interaction forces, and a time-dependent surfactant adsorption.

Clara Rojas; Máximo García-Sucre; Germán Urbina-Villalba

2010-12-15T23:59:59.000Z

128

Microwave emissions from police radar  

E-Print Network (OSTI)

The purpose of this study was to evaluate police officers exposures to microwaves emitted by traffic radar units at the ocular and testicular level. Additionally, comparisons were made of the radar manufacturers published maximum power density specifications and actual measured power densities taken at the antenna face of those units. Four different speed enforcement agencies and one transportation research institute provided fifty four different radar units for evaluation. Of those units, nine dash mounted. five rear mounted, and three hand held models were included. During this study, only four of the 986 measurements taken exceeded the American National Standards Institute(ANSI) limit of 5 MW/CM2 , and none exceeded the American Conference of Governmental Industrial Hygienists(ACGIH), Institute of Electrical and Electronic Engineers(IEEE), or Occupational Safety and Health Administration(OSHA) standard of 10 MW/CM2 . None of the 812 measurements taken at the officers seated ocular and testicular positions exceeded .04 MW/CM2. In fact, the highest reading observed in the drivers' position was .034 MW/CM2 taken at the 5th percentile testicular level, less than 1% of the lowest current safety standard. Because of the confusion that exists in the medical and scientific communities concerning non-ionizing radiation, the extent of health risks associated with long term exposure to police radar is not yet known. Until science has indisputably proven that long term, low power exposure is not harmful, it is recommended that police departments take steps to limit officer exposure. There are several ways that police departments can limit exposure cheaply and with minimal effort. The purchasing department should first consider radar units with the lowest published maximum power densities. New hand held radar units should not be purchased because they leave open the opportunity for operators to place their bodies in the radar beam path. Purchasing units whose antennae mount outside the patrol vehicle will also lower exposure to microwaves. Finally, training that stresses the importance of using the radar units' stand-by mode when not actually monitoring traffic will further limit exposure.

Fink, John Michael

1994-01-01T23:59:59.000Z

129

Alternative Fuels Data Center: Drop-In Biofuels  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Drop-In Biofuels to Drop-In Biofuels to someone by E-mail Share Alternative Fuels Data Center: Drop-In Biofuels on Facebook Tweet about Alternative Fuels Data Center: Drop-In Biofuels on Twitter Bookmark Alternative Fuels Data Center: Drop-In Biofuels on Google Bookmark Alternative Fuels Data Center: Drop-In Biofuels on Delicious Rank Alternative Fuels Data Center: Drop-In Biofuels on Digg Find More places to share Alternative Fuels Data Center: Drop-In Biofuels on AddThis.com... More in this section... Biobutanol Drop-In Biofuels Methanol P-Series Renewable Natural Gas xTL Fuels Drop-In Biofuels Drop-in biofuels are hydrocarbon fuels substantially similar to gasoline, diesel, or jet fuels. These fuels can be made from a variety of biomass feedstocks including crop residues, woody biomass, dedicated energy crops,

130

Modifying Char Dustcake Pressure Drop Using Particulate Additives  

DOE Green Energy (OSTI)

Coal gasification produces residual particles of coal char, coal ash, and sorbent that are suspended in the fuel gas stream exiting the gasifier. In most cases, these particles (referred to, hereafter, simply as char) must be removed from the stream prior to sending the gas to a turbine, fuel cell, or other downstream device. Currently, the most common approach to cleaning the gas stream at high temperature and pressure is by filtering the particulate with a porous ceramic or metal filter. However, because these dusts frequently have small size distributions, irregular morphology, and high specific surface areas, they can have very high gas flow resistance resulting in hot-gas filter system operating problems. Typical of gasification chars, the hot-gas filter dustcakes produced at the Power Systems Development Facility (PSDF) during recent coal gasification tests have had very high flow resistance (Martin et al, 2002). The filter system has been able to successfully operate, but pressure drops have been high and filter cleaning must occur very frequently. In anticipation of this problem, a study was conducted to investigate ways of reducing dustcake pressure drop. This paper will discuss the efficacy of adding low-flow-resistance particulate matter to the high-flow-resistance char dustcake to reduce dustcake pressure drop. The study had two parts: a laboratory screening study and confirming field measurements at the PSDF.

Landham, C.; Dahlin, R.S.; Martin, R.A.; Guan, X.

2002-09-19T23:59:59.000Z

131

Adiabatic two-phase frictional pressure drops in microchannels  

SciTech Connect

Two-phase pressure drops were measured over a wide range of experimental test conditions in two sizes of microchannels (sight glass tubes 0.509 and 0.790 mm) for two refrigerants (R-134a and R-245fa). Similar to the classic Moody diagram in single-phase flow, three zones were distinguishable when plotting the variation of the two-phase friction factor versus the two-phase Reynolds number: a laminar regime for Re{sub TP} < 2000, a transition regime for 2000 {<=} Re{sub TP} < 8000 and a turbulent regime for Re{sub TP} {>=} 8000. The laminar zone yields a much sharper gradient than in single-phase flow. The transition regime is not predicted well by any of the prediction methods for two-phase frictional pressure drops available in the literature. This is not unexpected since only a few data are available for this region in the literature and most methods ignore this regime, jumping directly from laminar to turbulent flow at Re{sub TP} = 2000. The turbulent zone is best predicted by the Mueller-Steinhagen and Heck correlation. Also, a new homogeneous two-phase frictional pressure drop has been proposed here with a limited range of application. (author)

Revellin, Remi; Thome, John R. [EPFL, STI ISE LTCM, ME Gl 464, Station 9, CH-1015 Lausanne (Switzerland)

2007-07-15T23:59:59.000Z

132

Sidelobe Contamination in Bistatic Radars  

Science Conference Proceedings (OSTI)

The problem of sidelobe contamination in a bistatic network is explored. The McGill bistatic network consists of one S-band Doppler radar and two low-gain passive receivers at remote sites. Operational experience with the bistatic network ...

Ramón de Elía; Isztar Zawadzki

2000-10-01T23:59:59.000Z

133

Field Training in Radar Meteorology  

Science Conference Proceedings (OSTI)

The NSF Division of Mesoscale Meteorology and the University of Nevada—Reno (UNR) provided support for a two-week field course at the CSU—CHILL radar during 12—24 May 1991. Ten atmospheric science graduate students and two faculty from the Desert ...

John Hallett; Melanie Wetzel; Steven Rutledge

1993-01-01T23:59:59.000Z

134

Assembly flow simulation of a radar  

Science Conference Proceedings (OSTI)

A discrete event simulation model has been developed to predict the assembly flow time of a new radar product. The simulation was the key tool employed to identify flow constraints. The radar, production facility, and equipment complement were designed, arranged, and selected to provide the most manufacturable assembly possible. A goal was to reduce the assembly and testing cycle time from twenty-six weeks to six weeks. A computer software simulation package (SLAM II) was utilized as the foundation a for simulating the assembly flow time. FORTRAN subroutines were incorporated into the software to deal with unique flow circumstances that were not accommodated by the software. Detailed information relating to the assembly operations was provided by a team selected from the engineering, manufacturing management, inspection, and production assembly staff. The simulation verified that it would be possible to achieve the cycle time goal of six weeks. Equipment and manpower constraints were identified during the simulation process and adjusted as required to achieve the flow with a given monthly production requirement. The simulation is being maintained as a planning tool to be used to identify constraints in the event that monthly output is increased. ``What-if`` studies have been conducted to identify the cost of reducing constraints caused by increases in output requirement.

Rutherford, W.C.; Biggs, P.M.

1993-10-01T23:59:59.000Z

135

A kinematic wave theory of capacity drop  

E-Print Network (OSTI)

Capacity drop at active bottlenecks is one of the most puzzling traffic phenomena, but a thorough understanding is practically important for designing variable speed limit and ramp metering strategies. In this study, we attempt to develop a simple model of capacity drop within the framework of kinematic wave theory based on the observation that capacity drop occurs when an upstream queue forms at an active bottleneck. In addition, we assume that the fundamental diagrams are continuous in steady states. This assumption is consistent with observations and can avoid unrealistic infinite characteristic wave speeds in discontinuous fundamental diagrams. A core component of the new model is an entropy condition defined by a discontinuous boundary flux function. For a lane-drop area, we demonstrate that the model is well-defined, and its Riemann problem can be uniquely solved. We theoretically discuss traffic stability with this model subject to perturbations in density, upstream demand, and downstream supply. We clarify that discontinuous flow-density relations, or so-called "discontinuous" fundamental diagrams, are caused by incomplete observations of traffic states. Theoretical results are consistent with observations in the literature and are verified by numerical simulations and empirical observations. We finally discuss potential applications and future studies.

Wen-Long Jin; Qi-Jian Gan; Jean-Patrick Lebacque

2013-10-09T23:59:59.000Z

136

Raindrop Velocity Spectrometer for Drop Chemistry Investigations  

Science Conference Proceedings (OSTI)

The design of an instrument that sorts raindrops according to fall speed is described. The apparatus consists of two rotating disks, the upper one allowing rain to fall through a slit into collectors on the lower disk. Drops are collected in a ...

S. G. Bradley

1985-06-01T23:59:59.000Z

137

A new model of cloud drop distribution that simulates the observed drop  

NLE Websites -- All DOE Office Websites (Extended Search)

A new model of cloud drop distribution that simulates the observed drop A new model of cloud drop distribution that simulates the observed drop clustering: effect of clustering on extinction coefficient estimates Knyazikhin, Yuri Boston University Marshak, Alexander NASA Goddard Space Flight Center Larsen, Michael Michigan Technological University Wiscombe, Warren BNL/NASA Goddard Space Flight Center Category: Modeling Cloud droplet size distribution is one of the most fundamental subjects in cloud physics. Understanding of spatial distribution and small-scale fluctuations of cloud droplets is essential for both cloud physics and atmospheric radiation. For cloud physics, it relates to the coalescence growth of raindrops while for radiation, it has a strong impact on a cloud's radiative properties. We have developed new size dependent models

138

Two terminal micropower radar sensor  

DOE Patents (OSTI)

A simple, low power ultra-wideband radar motion sensor/switch configuration connects a power source and load to ground. The switch is connected to and controlled by the signal output of a radar motion sensor. The power input of the motion sensor is connected to the load through a diode which conducts power to the motion sensor when the switch is open. A storage capacitor or rechargeable battery is connected to the power input of the motion sensor. The storage capacitor or battery is charged when the switch is open and powers the motion sensor when the switch is closed. The motion sensor and switch are connected between the same two terminals between the source/load and ground. 3 figs.

McEwan, T.E.

1995-11-07T23:59:59.000Z

139

Two terminal micropower radar sensor  

SciTech Connect

A simple, low power ultra-wideband radar motion sensor/switch configuration connects a power source and load to ground. The switch is connected to and controlled by the signal output of a radar motion sensor. The power input of the motion sensor is connected to the load through a diode which conducts power to the motion sensor when the switch is open. A storage capacitor or rechargeable battery is connected to the power input of the motion sensor. The storage capacitor or battery is charged when the switch is open and powers the motion sensor when the switch is closed. The motion sensor and switch are connected between the same two terminals between the source/load and ground.

McEwan, Thomas E. (Livermore, CA)

1995-01-01T23:59:59.000Z

140

High-Temporal-Resolution Capabilities of the National Weather Radar Testbed Phased-Array Radar  

Science Conference Proceedings (OSTI)

Since 2007 the advancement of the National Weather Radar Testbed Phased-Array Radar (NWRT PAR) hardware and software capabilities has been supporting the implementation of high-temporal-resolution (1 min) sampling. To achieve the increase in ...

Pamela L. Heinselman; Sebastián M. Torres

2011-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Measurement of Atmospheric Aspect Sensitivity Using Coherent Radar Imaging after Mitigation of Radar Beam Weighting Effect  

Science Conference Proceedings (OSTI)

The aspect angle, a measurement of the aspect sensitivity of atmospheric refractivity irregularities, was estimated with multiple-receiver coherent radar imaging (CRI) of very high frequency (VHF) atmospheric radar. Two CRI parameters retrieved by ...

Jenn-Shyong Chen; Jun-ichi Furumoto

2013-02-01T23:59:59.000Z

142

The Use of TRMM Precipitation Radar Observations in Determining Ground Radar Calibration Biases  

Science Conference Proceedings (OSTI)

Since the successful launch of the Tropical Rainfall Measuring Mission (TRMM) satellite, measurements of a wide variety of precipitating systems have been obtained with unprecedented detail from the first space-based radar [precipitation radar (...

Emmanouil N. Anagnostou; Carlos A. Morales; Tufa Dinku

2001-04-01T23:59:59.000Z

143

Monitoring the Reflectivity Calibration of a Scanning Radar Using a Profiling Radar and a Disdrometer  

Science Conference Proceedings (OSTI)

This paper describes a method of absolutely calibrating and routinely monitoring the reflectivity calibration from a scanning weather radar using a vertically profiling radar that has been absolutely calibrated using a collocated surface ...

Christopher R. Williams; Kenneth S. Gage; Wallace Clark; Paul Kucera

2005-07-01T23:59:59.000Z

144

Ultrasonic characterization of single drops of liquids  

DOE Patents (OSTI)

Ultrasonic characterization of single drops of liquids is disclosed. The present invention includes the use of two closely spaced transducers, or one transducer and a closely spaced reflector plate, to form an interferometer suitable for ultrasonic characterization of droplet-size and smaller samples without the need for a container. The droplet is held between the interferometer elements, whose distance apart may be adjusted, by surface tension. The surfaces of the interferometer elements may be readily cleansed by a stream of solvent followed by purified air when it is desired to change samples. A single drop of liquid is sufficient for high-quality measurement. Examples of samples which may be investigated using the apparatus and method of the present invention include biological specimens (tear drops; blood and other body fluid samples; samples from tumors, tissues, and organs; secretions from tissues and organs; snake and bee venom, etc.) for diagnostic evaluation, samples in forensic investigations, and detection of drugs in small quantities. 5 figs.

Sinha, D.N.

1998-04-14T23:59:59.000Z

145

MECHANICAL TEST LAB CAPABILITIES  

E-Print Network (OSTI)

MECHANICAL TEST LAB CAPABILITIES · Static and cyclic testing (ASTM and non-standard) · Impact drop testing · Slow-cycle fatigue testing · High temperature testing to 2500°F · ASTM/ Boeing/ SACMA standard testing · Ability to design and fabricate non-standard test fixtures and perform non-standard tests

146

Rapid Sampling of Severe Storms by the National Weather Radar Testbed Phased Array Radar  

Science Conference Proceedings (OSTI)

A key advantage of the National Weather Radar Testbed Phased Array Radar (PAR) is the capability to adaptively scan storms at higher temporal resolution than is possible with the Weather Surveillance Radar-1988 Doppler (WSR-88D): 1 min or less ...

Pamela L. Heinselman; David L. Priegnitz; Kevin L. Manross; Travis M. Smith; Richard W. Adams

2008-10-01T23:59:59.000Z

147

The 30th International Conference on Radar Meteorology  

Science Conference Proceedings (OSTI)

The 30th International Conference on Radar Meteorology, held in Munich, Germany, 19–24 July 2001, highlighted recent progress in the field of radar meteorology and demonstrated how radar is used in many integrated ways to better understand and ...

Matthias Steiner; Peter F. Meischner

2002-11-01T23:59:59.000Z

148

Ultra-wideband radar motion sensor  

DOE Patents (OSTI)

A motion sensor is based on ultra-wideband (UWB) radar. UWB radar range is determined by a pulse-echo interval. For motion detection, the sensors operate by staring at a fixed range and then sensing any change in the averaged radar reflectivity at that range. A sampling gate is opened at a fixed delay after the emission of a transmit pulse. The resultant sampling gate output is averaged over repeated pulses. Changes in the averaged sampling gate output represent changes in the radar reflectivity at a particular range, and thus motion. 15 figs.

McEwan, T.E.

1994-11-01T23:59:59.000Z

149

Experimental investigation of ice slurry flow pressure drop in horizontal tubes  

SciTech Connect

Pressure drop behaviour of ice slurry based on ethanol-water mixture in circular horizontal tubes has been experimentally investigated. The secondary fluid was prepared by mixing ethyl alcohol and water to obtain initial alcohol concentration of 10.3% (initial freezing temperature -4.4 C). The pressure drop tests were conducted to cover laminar and slightly turbulent flow with ice mass fraction varying from 0% to 30% depending on test conditions. Results from flow tests reveal much higher pressure drop for higher ice concentrations and higher velocities in comparison to the single phase flow. However for ice concentrations of 15% and higher, certain velocity exists at which ice slurry pressure drop is same or even lower than for single phase flow. It seems that higher ice concentration delay flow pattern transition moment (from laminar to turbulent) toward higher velocities. In addition experimental results for pressure drop were compared to the analytical results, based on Poiseulle and Buckingham-Reiner models for laminar flow, Blasius, Darby and Melson, Dodge and Metzner, Steffe and Tomita for turbulent region and general correlation of Kitanovski which is valid for both flow regimes. For laminar flow and low buoyancy numbers Buckingham-Reiner method gives good agreement with experimental results while for turbulent flow best fit is provided with Dodge-Metzner and Tomita methods. Furthermore, for transport purposes it has been shown that ice mass fraction of 20% offers best ratio of ice slurry transport capability and required pumping power. (author)

Grozdek, Marino; Khodabandeh, Rahmatollah; Lundqvist, Per [Royal Institute of Technology, Department of Energy Technology, Division of Applied Thermodynamics and Refrigeration, Brinellvaegen 68, 10044 Stockholm (Sweden)

2009-01-15T23:59:59.000Z

150

The Development of Drop Size Distributions in Light Rain  

Science Conference Proceedings (OSTI)

A model of rain development based on the quasi-stochastic coalescence equation and including the sedimentation of drops has been used to study the formation of drop size distributions in conditions of weak updraft. Comparisons with “box model” ...

I. Zawadzki; E. Monteiro; F. Fabry

1994-04-01T23:59:59.000Z

151

Assessing Advances in the Assimilation of Radar Data and Other Mesoscale Observations within a Collaborative Forecasting–Research Environment  

Science Conference Proceedings (OSTI)

The impacts of assimilating radar data and other mesoscale observations in real-time, convection-allowing model forecasts were evaluated during the spring seasons of 2008 and 2009 as part of the Hazardous Weather Test Bed Spring Experiment ...

John S. Kain; Ming Xue; Michael C. Coniglio; Steven J. Weiss; Fanyou Kong; Tara L. Jensen; Barbara G. Brown; Jidong Gao; Keith Brewster; Kevin W. Thomas; Yunheng Wang; Craig S. Schwartz; Jason J. Levit

2010-10-01T23:59:59.000Z

152

Humidity Gradient Profiles from Wind Profiling Radars Using the NOAA/ETL Advanced Signal Processing System (SPS)  

Science Conference Proceedings (OSTI)

An algorithm to compute the magnitude of humidity gradient profiles from the measurements of the zeroth, first, and second moments of wind profiling radar (WPR) Doppler spectra was developed and tested. The algorithm extends the National Oceanic ...

B. Boba Stankov; Earl E. Gossard; Bob L. Weber; Richard J. Lataitis; Allen B. White; Daniel E. Wolfe; David C. Welsh; Richard G. Strauch

2003-01-01T23:59:59.000Z

153

A Variational Analysis Method for Retrieval of Three-Dimensional Wind Field from Single-Doppler Radar Data  

Science Conference Proceedings (OSTI)

A variational method for retrieval of the three-dimensional wind field from single-Doppler radar observations is developed and tested. The method uses the conservation equation for reflectivity and the continuity equation as a constraining model. ...

Stéphane Laroche; Isztar Zawadzki

1994-09-01T23:59:59.000Z

154

Drop Axis Ratios from a 2D Video Disdrometer  

Science Conference Proceedings (OSTI)

Results from an experiment to measure the drop shapes using a 2D video disdrometer (2DVD) are reported. Under calm conditions, drops were generated from a hose located on a bridge 80 m above ground, this height being sufficient to allow drop ...

Merhala Thurai; V. N. Bringi

2005-07-01T23:59:59.000Z

155

Delayed Frost Growth on Jumping-Drop Superhydrophobic Surfaces  

Science Conference Proceedings (OSTI)

Self-propelled jumping drops are continuously removed from a condensing superhydrophobic surface to enable a micrometric steady-state drop size. Here, we report that subcooled condensate on a chilled superhydrophobic surface are able to repeatedly jump off the surface before heterogeneous ice nucleation occurs. Frost still forms on the superhydrophobic surface due to ice nucleation at neighboring edge defects, which eventually spreads over the entire surface via an inter-drop frost wave. The growth of this inter-drop frost front is shown to be up to three times slower on the superhydrophobic surface compared to a control hydrophobic surface, due to the jumping-drop effect dynamically minimizing the average drop size and surface coverage of the condensate. A simple scaling model is developed to relate the success and speed of inter-drop ice bridging to the drop size distribution. While other reports of condensation frosting on superhydrophobic surfaces have focused exclusively on liquid-solid ice nucleation for isolated drops, these findings reveal that the growth of frost is an inter-drop phenomenon that is strongly coupled to the wettability and drop size distribution of the surface. A jumping-drop superhydrophobic condenser was found to be superior to a conventional dropwise condenser in two respects: preventing heterogeneous ice nucleation by continuously removing subcooled condensate, and delaying frost growth by minimizing the success of interdrop ice bridge formation.

Boreyko, Jonathan B [ORNL; Collier, Pat [ORNL

2013-01-01T23:59:59.000Z

156

Retrieval of Precipitation Profiles from Airborne Radar and Passive Radiometer Measurements: Comparison with Dual-Frequency Radar Measurements  

Science Conference Proceedings (OSTI)

This study compares precipitation rate profiles derived from a single frequency radar and radiometer with such profiles derived from a dual-frequency radar.

J. A. Weinman; R. Meneghini; K. Nakamura

1990-10-01T23:59:59.000Z

157

Radar Determination of Snowfall Rate and Accumulation  

Science Conference Proceedings (OSTI)

A unique method that provides for relating radar-measured reflectivity factors to snowfall rates at the ground is presented. Data were provided by a CPS-9, 3.2 cm radar from six 1978 Massachusetts snowstorms A best-fit power-law relationship ...

Roland J. Boucher; James G. Wieler

1985-01-01T23:59:59.000Z

158

Helicopter discrimination apparatus for the murine radar  

DOE Patents (OSTI)

A helicopter discrimination apparatus for a radar utilizing doppler filtering to discriminate between a missile and ground clutter. The short duration of the doppler filter pulses which are emitted by helicopter rotor blades are processed to prevent false alarms, thus allowing the radar-protected helicopter to operate in formation with other helicopters while maintaining protection against infra-red-seeking missiles.

Webb, Jr., John G. (Sandia Park, NM); Gray, Roger M. (Dallas, TX)

1977-01-01T23:59:59.000Z

159

Ultra-wideband radar sensors and networks  

DOE Patents (OSTI)

Ultra wideband radar motion sensors strategically placed in an area of interest communicate with a wireless ad hoc network to provide remote area surveillance. Swept range impulse radar and a heart and respiration monitor combined with the motion sensor further improves discrimination.

Leach, Jr., Richard R; Nekoogar, Faranak; Haugen, Peter C

2013-08-06T23:59:59.000Z

160

Utilizing Spaceborne Radars to Retrieve Dry Snowfall  

Science Conference Proceedings (OSTI)

A dataset consisting of one year of CloudSat Cloud Profiling Radar (CPR) near-surface radar reflectivity Z associated with dry snowfall is examined in this study. The CPR observations are converted to snowfall rates S using derived Ze–S ...

Mark S. Kulie; Ralf Bennartz

2009-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Drilling costs drop 7% in 1985  

SciTech Connect

Drilling costs dropped about 7% last year. This decline cancels a slight increase in 1984. Total costs to drill now run about 59% of the 1981 highs. Comparable figures for the previous 2 years are 63 and 61%. Deeper wells showed the biggest drops. Shallow well costs fell about 6%. Energy Information Administration (EIA) indexes drilling costs on a 1976 base year. Costs for shallow wells (5,000 ft or less) show an index about 138. Deeper wells have an index around 149. Cost declines were the greatest in West and North Texas and the Rockies, of 11%. The Northeast and Western areas showed greater than average declines, 9% or so. The High Plains, New Mexico, and Midcontinent areas recorded near the average 7% decline. Costs in South Louisiana, the Southeast, and Ark-La-Tex 2%. West Central Texas costs were off only 1%. The Southeast was essentially unchanged. Indexes by area show generally that drilling costs have declined since 1983. The summary here comes from EIA's ''Indexes and Estimates of Domestic Well Drilling Costs 1984 and 1985''. That report covers oil, gas, and dry hole costs, cost components, and overall costs.

Anderson, T.; Funk, V.

1986-03-24T23:59:59.000Z

162

Study of a liquid-gas mixing layer: Shear instability and size of produced drops  

E-Print Network (OSTI)

Study of a liquid-gas mixing layer: Shear instability and size of produced drops Sylvain Marty +++++ Presented by £££££ Abstract We study experimentally the atomization of a liquid sheet by a parallel gas flow creation. We study in particular the regimes at low M (ratio of gas/liquid dynamic pressures), to test

Paris-Sud XI, Université de

163

A Simple Technique for Simultaneous Suspension of Multiple Drops in a Small Vertical Wind Tunnel  

Science Conference Proceedings (OSTI)

A simple technique is described by which multiple millimeter-size water drops can be simultaneously suspended in an air stream above the test section of a 12 × 12 cm cross section of a vertical wind tunnel. Horizontal profiles of the vertical air ...

A. K. Kamra; D. V. Ahire

1985-09-01T23:59:59.000Z

164

Effect of bed pressure drop on performance of a CFB boiler  

Science Conference Proceedings (OSTI)

The effect of bed pressure drop and bed inventory on the performances of a circulating fluidized bed (CFB) boiler was studied. By using the state specification design theory, the fluidization state of the gas-solids flow in the furnace of conventional CFB boilers was reconstructed to operate at a much lower bed pressure drop by reducing bed inventory and control bed quality. Through theoretical analysis, it was suggested that there would exist a theoretical optimal value of bed pressure drop, around which the boiler operation can achieve the maximal combustion efficiency and with significant reduction of the wear of the heating surface and fan energy consumption. The analysis was validated by field tests carried out in a 75 t/h CFB boiler. At full boiler load, when bed pressure drop was reduced from 7.3 to 3.2 kPa, the height of the dense zone in the lower furnace decreased, but the solid suspension density profile in the upper furnace and solid flow rate were barely influenced. Consequently, the average heat transfer coefficient in the furnace was kept nearly the same and the furnace temperature increment was less than 17{sup o}C. It was also found that the carbon content in the fly ash decreased first with decreasing bed pressure drop and then increased with further increasing bed pressure drop. The turning point with minimal carbon content was referred to as the point with optimal bed pressure drop. For this boiler, at the optimum point the bed pressure was around 5.7 kPa with the overall excess air ratio of 1.06. When the boiler was operated around this optimal point, not only the combustion efficiency was improved, but also fan energy consumption and wear of heating surface were reduced. 23 refs., 6 figs., 4 tabs.

Hairui Yang; Hai Zhang; Shi Yang; Guangxi Yue; Jun Su; Zhiping Fu [Tsinghua University, Beijing (China). Department of Thermal Engineering

2009-05-15T23:59:59.000Z

165

Shape oscillations of a viscoelastic drop  

SciTech Connect

Small-amplitude axisymmetric shape deformations of a viscoelastic liquid drop in microgravity are theoretically analyzed. Using the Jeffreys constitutive equation for linear viscoelasticity, the characteristic equation for the frequency and decay factor of the shape oscillations is derived. Asymptotic analysis of this equation is performed in the low- and high-viscosity limits and for the cases of small, moderate, and large elasticities. Elastic effects are shown to give rise to a type of shape oscillation that does not depend on the surface tension. The existence of such oscillations is confirmed by numerical solution of the characteristic equation in various regimes. A method for determining the viscoelastic properties of highly viscous liquids based upon experimental measurements of the frequency and damping rate of such shape oscillations is suggested.

Khismatullin, Damir B.; Nadim, Ali

2001-06-01T23:59:59.000Z

166

Horizontal Drop of 21- PWR Waste Package  

SciTech Connect

The objective of this calculation is to determine the structural response of the waste package (WP) dropped horizontally from a specified height. The WP used for that purpose is the 21-Pressurized Water Reactor (PWR) WP. The scope of this document is limited to reporting the calculation results in-terms of stress intensities. This calculation is associated with the WP design and was performed by the Waste Package Design group in accordance with the ''Technical Work Plan for: Waste Package Design Description for LA'' (Ref. 16). AP-3.12Q, ''Calculations'' (Ref. 1 1) is used to perform the calculation and develop the document. The sketches attached to this calculation provide the potential dimensions and materials for the 21-PWR WP design.

A.K. Scheider

2007-01-31T23:59:59.000Z

167

Load drop evaluation for TWRS FSAR  

Science Conference Proceedings (OSTI)

Operational or remediation activities associated with existing underground high-level waste storage tank structures at the Hanford Site often require the installation/removal of various equipment items. To gain tank access for installation or removal of this equipment, large concrete cover blocks must be removed and reinstalled in existing concrete pits above the tanks. An accidental drop of the equipment or cover blocks while being moved over the tanks that results in the release of contaminants to the air poses a potential risk to onsite workers or to the offsite public. To minimize this potential risk, the use of critical lift hoisting and rigging procedures and restrictions on lift height are being considered during development of the new tank farm Basis for Interim Operation and Final Safety Analysis Report. The analysis contained herein provides information for selecting the appropriate lift height restrictions for these activities.

Julyk, L.J.; Ralston, G.L.

1996-09-30T23:59:59.000Z

168

Using doppler radar images to estimate aircraft navigational heading error  

SciTech Connect

A yaw angle error of a motion measurement system carried on an aircraft for navigation is estimated from Doppler radar images captured using the aircraft. At least two radar pulses aimed at respectively different physical locations in a targeted area are transmitted from a radar antenna carried on the aircraft. At least two Doppler radar images that respectively correspond to the at least two transmitted radar pulses are produced. These images are used to produce an estimate of the yaw angle error.

Doerry, Armin W. (Albuquerque, NM); Jordan, Jay D. (Albuquerque, NM); Kim, Theodore J. (Albuquerque, NM)

2012-07-03T23:59:59.000Z

169

Chemoembolization Decreases Drop-Off Risk of Hepatocellular Carcinoma Patients on the Liver Transplant List  

Science Conference Proceedings (OSTI)

Introduction: The drop-off risk for patients awaiting liver transplantation for hepatocellular carcinoma (HCC) is 22%. Transplant liver availability is expected to worsen, resulting in longer waiting times and increased drop-off rates. Our aim was to determine whether chemoembolization can decrease this risk. Patients and Methods: Eighty-seven consecutive HCC patients listed for liver transplant (Milan criteria) underwent statistical comparability adjustments using the propensity score (Wilcoxon, Fisher's, and chi-square tests). Forty-three nonchemoembolization patients and 22 chemoembolization patients were comparable for Child-Pugh and Model for End-Stage Liver Disease scores, tumor size and number, alpha fetoprotein (AFP) levels, and cause of cirrhosis. We calculated the risk of dropping off the transplant list by assigning a transplant time to those who dropped off (equal probability with patients who were on the list longer than the patient in question). The significance level was obtained by calculating the simulation distribution of the difference compared with the permutations of chemoembolization versus nonchemoembolization assignment of the patients. Kaplan-Meier estimators (log-rank test) were used to determine survival rates. Results: Median follow-up was 187 {+-} 110 weeks (range 38 to 435, date of diagnosis). The chemoembolization group had an 80% drop-off risk decrease (15% nonchemoembolization versus 3% chemoembolization, p = 0.04). Although survival was better for the chemoembolization group, it did not reach statistical significance. Two-year survival for the nonchemoembolization and chemoembolization group was 57.3% {+-} 7.1% and 76.0% {+-} 7.9%, respectively (p = 0.078). Conclusions: Chemoembolization appears to result in a significant decrease in the risk of dropping off liver transplant list for patients with HCC and results in a tendency toward longer survival.

Frangakis, Constantine [Johns Hopkins University, Department of Biostatistics, Bloomberg School of Public Health (United States); Geschwind, Jean-Francois; Kim, Daniel [Johns Hopkins University, Department of Vascular and Interventional Radiology (United States); Chen, Yong [Johns Hopkins University, Department of Biostatistics, Bloomberg School of Public Health (United States); Koteish, Ayman [Johns Hopkins University, Department of Transplant Hepatology (United States); Hong, Kelvin; Liapi, Eleni; Georgiades, Christos S., E-mail: g_christos@hotmail.com [Johns Hopkins University, Department of Vascular and Interventional Radiology (United States)

2011-12-15T23:59:59.000Z

170

DOE/SC-ARM-12-009 ARM Radar Organization JW Voyles  

NLE Websites -- All DOE Office Websites (Extended Search)

Bharadwaj Radar Calibration Plan, controlled document Nitin Bharadwaj Instrument Handbooks, controlled documents Kevin Widener Radar status and information: www.radar.arm.gov...

171

Fat Man Dropped on Nagasaki | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Fat Man Dropped on Nagasaki | National Nuclear Security Administration Fat Man Dropped on Nagasaki | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > About Us > Our History > NNSA Timeline > Fat Man Dropped on Nagasaki Fat Man Dropped on Nagasaki August 09, 1945 Nagasaki, Japan Fat Man Dropped on Nagasaki The implosion model plutonium bomb, called Fat Man, is dropped on Nagasaki,

172

Microwave Dielectric Heating of Drops in Microfluidic Devices  

E-Print Network (OSTI)

We present a technique to locally and rapidly heat water drops in microfluidic devices with microwave dielectric heating. Water absorbs microwave power more efficiently than polymers, glass, and oils due to its permanent molecular dipole moment that has a large dielectric loss at GHz frequencies. The relevant heat capacity of the system is a single thermally isolated picoliter drop of water and this enables very fast thermal cycling. We demonstrate microwave dielectric heating in a microfluidic device that integrates a flow-focusing drop maker, drop splitters, and metal electrodes to locally deliver microwave power from an inexpensive, commercially available 3.0 GHz source and amplifier. The temperature of the drops is measured by observing the temperature dependent fluorescence intensity of cadmium selenide nanocrystals suspended in the water drops. We demonstrate characteristic heating times as short as 15 ms to steady-state temperatures as large as 30 degrees C above the base temperature of the microfluidi...

Issadore, David; Brown, Keith A; Sandberg, Lori; Weitz, David; Westervelt, Robert M

2009-01-01T23:59:59.000Z

173

Examination of the ?–? Relation Suggested for Drop Size Distribution Parameters  

Science Conference Proceedings (OSTI)

Raindrop size distributions are often assumed to follow a three-parameter gamma distribution. Since rain intensity retrieval from radar observations is an underdetermined problem, there is great interest in finding physical correlations between ...

Dmitri N. Moisseev; V. Chandrasekar

2007-05-01T23:59:59.000Z

174

TEST  

Science Conference Proceedings (OSTI)

This is an abstract. TEST Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras lacinia dui et est venenatis lacinia. Vestibulum lacus dolor, adipiscing id mattis sit amet, ultricies sed purus. Nulla consectetur aliquet feugiat. Maecenas ips

175

Virtual CSU-CHILL Radar: The VCHILL  

Science Conference Proceedings (OSTI)

The Virtual CHILL (VCHILL) system makes it possible to transfer the educational and research experience of the Colorado State University dual polarization radar to remote locations over the Internet. The VCHILL operation includes remote control ...

V. Chandrasekar; Yoong-Goog Cho; D. Brunkow; A. Jayasumana

2005-07-01T23:59:59.000Z

176

Mean Radar Echo Characteristics during Project GALE  

Science Conference Proceedings (OSTI)

The mean radar echo characteristics during the Genesis of Atlantic Lows Experiment (GALE) are presented for the southeastern United States during the 15 January–15 March 1986 field phase of the program. The echo characteristics were derived from ...

Thomas J. Trunk; Lance F. Bosart

1990-02-01T23:59:59.000Z

177

Multiple-Doppler Radar Network Design  

Science Conference Proceedings (OSTI)

Observing programs utilizing Doppler radar must have them deployed in optimum locations to best satisfy experimental objectives and maximize economies. One wishes to determine the coordinate triples (xi, yi, zi), where i equals the number of ...

Peter S. Ray; Karen L. Sangren

1983-08-01T23:59:59.000Z

178

On the Sensitivity of Weather Radars  

Science Conference Proceedings (OSTI)

This paper discusses the subject of weather radar system sensitivity from a general point of view, with emphasis an the influence of wavelength. Expressions for the echo signal-to-noise ratio are examined using a detection theory approach to ...

Paul L. Smith

1986-12-01T23:59:59.000Z

179

Radar Backscattering by Inhomogeneous Precipitation Particles  

Science Conference Proceedings (OSTI)

Calculations of radar backscattering by inhomogeneous precipitation particles require values of the dielectric function of two-component mixtures. Four such dielectric functions are critically examined and their relative merits are weighed. ...

Craig F. Bohren; Louis J. Battan

1980-08-01T23:59:59.000Z

180

Radar and Radiation Properties of Ice Clouds  

Science Conference Proceedings (OSTI)

The authors derive relations of the equivalent radar reflectivity Ze and extinction coefficient ? of ice clouds and confirm the theory by in situ aircraft observations during the First International Satellite Cloud Climatology Project Regional ...

David Atlas; Sergey Y. Matrosov; Andrew J. Heymsfield; Ming-Dah Chou; David B. Wolff

1995-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Radar Observations of a Major Industrial Fire  

Science Conference Proceedings (OSTI)

On 23 May 1996, a Montreal suburban paint factory containing several hundred thousand gallons of paints, solvents, and other chemicals burned to the ground in a spectacular fire. The smoke plume from the fire was readily detected by three radars ...

R. R. Rogers; W. O. J. Brown

1997-05-01T23:59:59.000Z

182

Geostationary Doppler Radar and Tropical Cyclone Surveillance  

Science Conference Proceedings (OSTI)

The potential usefulness of spaceborne Doppler radar as a tropical cyclone observing tool is assessed by conducting a high-resolution simulation of an intense hurricane and generating synthetic observations of reflectivity and radial velocity. The ...

William E. Lewis; Eastwood Im; Simone Tanelli; Ziad Haddad; Gregory J. Tripoli; Eric A. Smith

2011-10-01T23:59:59.000Z

183

Optimization of Multiparameter Radar Estimates of Rainfall  

Science Conference Proceedings (OSTI)

The estimates of rainfall rate derived from a multiparameter radar based on reflectivity factor (RZH), differential reflectivity (RDR), and specific differential propagation phase (RDP) have widely varying accuracies over the dynamic range of the ...

V. Chandrasekar; Eugenio Gorgucci; Gianfranco Scarchilli

1993-07-01T23:59:59.000Z

184

Mapping of Airborne Doppler Radar Data  

Science Conference Proceedings (OSTI)

Two sets of equations are derived to 1) map airborne Doppler radar data from an aircraft-relative coordinate system to an earth-relative coordinate system, and 2) remove the platform motion from the observed Doppler velocities. These equations ...

Wen-Chau Lee; Peter Dodge; Frank D. Marks Jr.; Peter H. Hildebrand

1994-04-01T23:59:59.000Z

185

Radar System Errors in Polarization Diversity Measurements  

Science Conference Proceedings (OSTI)

The measurement capability of a polarization diversity radar is limited by several characteristics of the system and particularly by the performance of the antenna, which is characterized by the integrated cancellation ratio or integrated cross-...

James I. Metcalf; James S. Ussailis

1984-06-01T23:59:59.000Z

186

government share of university r&d drops - TMS  

Science Conference Proceedings (OSTI)

11/3 - GOVERNMENT SHARE OF UNIVERSITY R&D DROPS. In FY2008, universities reported science and engineering research and development ...

187

Little Boy Dropped on Hiroshima | National Nuclear Security Administra...  

NLE Websites -- All DOE Office Websites (Extended Search)

Little Boy Dropped on Hiroshima | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response...

188

Little Boy Dropped on Hiroshima | National Nuclear Security Administra...  

National Nuclear Security Administration (NNSA)

NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > About Us > Our History > NNSA Timeline > Little Boy Dropped on Hiroshima Little Boy...

189

Ground Penetrating Imaging Radar Phase II  

Science Conference Proceedings (OSTI)

EPRI project "Ground Penetrating Imaging Radar Phase II," also called the "GPiR Project," started in August 1998 at Schlumberger-Doll Research, a division of Schlumberger Technology Corporation. Its goal was to determine if modern ground-penetrating radar (GPR) could make three-dimensional (3D) images of buried utility lines accurate and detailed enough to help utility companies better manage their underground infrastructure. Work began with a comparison of commercial and prototype GPR systems in the lab...

2001-06-20T23:59:59.000Z

190

Dependence of drop speed on nozzle diameter, viscosity and drive amplitude in drop-on-demand ink-jet printing  

E-Print Network (OSTI)

recent numerical codes developed by collaborators in the University of Leeds, and from simple models for drop-on-demand fluid jetting resulting from physical laws...

Hoath, S.D.; Hsiao, W.-K.; Jung, S.; Martin, G.D.; Hutchings, I.M.

2011-01-01T23:59:59.000Z

191

Use of the CSU–CHILL Radar in Radar Meteorology Education at Colorado State University  

Science Conference Proceedings (OSTI)

A recent example illustrating the use of the CSU–CHILL Doppler radar in a graduate-level course in radar meteorology at Colorado State University (CSU) is described. In addition to providing students in the Department of Atmospheric Science with “...

Steven A. Rutledge; Patrick C. Kennedy; David A. Brunkow

1993-01-01T23:59:59.000Z

192

Nonuniform Beamfilling Correction for Spaceborne Radar Rainfall Measurement: Implications from TOGA COARE Radar Data Analysis  

Science Conference Proceedings (OSTI)

A method is studied to make a nonuniform beamfilling (NUBF) correction for the path-integrated attenuation (PIA) derived from spaceborne radar measurement. The key of this method is to estimate rain-rate variability within a radar field of view ...

Toshiaki Kozu; Toshio Iguchi

1999-11-01T23:59:59.000Z

193

Japan Denies Report It Dropped Proposal to Host Fusion Reactor  

E-Print Network (OSTI)

Print Japan Denies Report It Dropped Proposal to Host Fusion Reactor June 22 (Bloomberg) -- Japan's science ministry denied a media report the country dropped its bid to host the world's first nuclear fusion reactor, a decision that would end a standoff with France to site the 4.6 billion-euro ($5

194

Laboratory Measurements of Particle Capture by Evaporating Cloud Drops  

Science Conference Proceedings (OSTI)

The capture efficiencies of evaporating cloud drops (56–93 ?m radius) for particles of manganese hypophosphite (0.58–3.2 ?m radius) were obtained experimentally. In each experimental run, a large number of widely spaced uniform size drops fell ...

K. H. Leong; K. V. Beard; Harry T. Ochs III

1982-05-01T23:59:59.000Z

195

Strengths and Limitations of Current Radar Systems for Two Stakeholder Groups in the Southern Plains  

Science Conference Proceedings (OSTI)

Advancements in radar technology since the deployment of the Weather Surveillance Radar-1988 Doppler (WSR-88D) network have prompted consideration of radar replacement technologies. In order for the outcomes of advanced radar research and ...

Daphne S. LaDue; Pamela L. Heinselman; Jennifer F. Newman

2010-07-01T23:59:59.000Z

196

A Comparison of Tornado Warning Lead Times with and without NEXRAD Doppler Radar  

Science Conference Proceedings (OSTI)

The installation of the network of NEXRAD (Next Generation Weather Radar) WSR-88D (Weather Surveillance Radar—1988 Doppler) radars has been an ongoing process for more than three years. An assessment is made on how these radars and related ...

Paul Bieringer; Peter S. Ray

1996-03-01T23:59:59.000Z

197

Spurious Velocities in Doppler Radar Data Caused by a Moving Antenna Feedhorn  

Science Conference Proceedings (OSTI)

Modern Doppler weather radars use clutter filtering to reduce the strength of ground targets and enhance the detection of meteorological echoes. WSR-88D [NEXRAD (Next Generation Radar) and TDWR (Terminal Doppler Weather Radar)] radars, for ...

Ronald E. Rinehart

1991-12-01T23:59:59.000Z

198

Can Lagrangian Extrapolation of Radar Fields Be Used for Precipitation Nowcasting over Complex Alpine Orography?  

Science Conference Proceedings (OSTI)

In this study, a Lagrangian radar echo extrapolation scheme (MAPLE) was tested for use in very short-term forecasting of precipitation over a complex orographic region. The high-resolution forecasts from MAPLE for lead times of 5 min–5 h are ...

Pradeep V. Mandapaka; Urs Germann; Luca Panziera; Alessandro Hering

2012-02-01T23:59:59.000Z

199

Errors and Uncertainties in Microwave Link Rainfall Estimation Explored Using Drop Size Measurements and High-Resolution Radar Data  

Science Conference Proceedings (OSTI)

Microwave links can be used for the estimation of path-averaged rainfall by using either the path-integrated attenuation or the difference in attenuation of two signals with different frequencies and/or polarizations. Link signals have been ...

Hidde Leijnse; Remko Uijlenhoet; Alexis Berne

2010-12-01T23:59:59.000Z

200

Ensemble Kalman Filter Assimilation of Radar Observations of the 8 May 2003 Oklahoma City Supercell: Influences of Reflectivity Observations on Storm-Scale Analyses  

Science Conference Proceedings (OSTI)

Ensemble Kalman filter (EnKF) techniques have been proposed for obtaining atmospheric state estimates on the scale of individual convective storms from radar and other observations, but tests of these methods with observations of real convective ...

David C. Dowell; Louis J. Wicker; Chris Snyder

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Testing technology  

SciTech Connect

This bulletin from Sandia National Laboratories presents current research highlights in testing technology. Ion microscopy offers new nondestructive testing technique that detects high resolution invisible defects. An inexpensive thin-film gauge checks detonators on centrifuge. Laser trackers ride the range and track helicopters at low-level flights that could not be detected by radar. Radiation transport software predicts electron/photon effects via cascade simulation. Acoustic research in noise abatement will lead to quieter travelling for Bay Area Rapid Transport (BART) commuters.

Not Available

1993-10-01T23:59:59.000Z

202

An Integrated Display and Analysis Methodology for Multivariable Radar Data  

Science Conference Proceedings (OSTI)

Polarimetric Doppler radars provide valuable information about the kinematic and microphysical structure of storms. However, in-depth analysis using radar products, such as Doppler-derived wind vectors and hydrometeor identification, has been ...

Brenda A. Dolan; Steven A. Rutledge

2007-08-01T23:59:59.000Z

203

An 11-cm Coherent Polarimetric Radar for Meteorological Research  

Science Conference Proceedings (OSTI)

The Geophysics Directorate of the U.S. Air Force developed a unique 11-cm (S-band) coherent polarimetric radar. The radar can transmit signals of alternating orthogonal polarizations, with either circular or linear basis, and receive signals of ...

James I. Metcalf; Alexander W. Bishop; Richard C. Chanley; Timothy C. Hiett; Pio J. Petrocchi

1993-06-01T23:59:59.000Z

204

A 94-GHz Doppler Radar for Cloud Observations  

Science Conference Proceedings (OSTI)

A Doppler radar operating at 3.2 mm wavelength was designed and assembled primarily for observation of clouds and precipitation. Phase detection of the radar signals which is required for Doppler operation is implemented through the use of a ...

Roger Lhermitte

1987-03-01T23:59:59.000Z

205

Inversion of Marine Radar Images for Surface Wave Analysis  

Science Conference Proceedings (OSTI)

A method to estimate sea surface elevation maps from marine radar image sequences is presented. This method is the extension of an existing inverse modeling technique to derive wave spectra from marine radar images, which assumes linear wave ...

JoséC. Nieto Borge; Germán RodrÍguez RodrÍguez; Katrin Hessner; Paloma Izquierdo González

2004-08-01T23:59:59.000Z

206

Simulating Range Oversampled Doppler Radar Profiles of Inhomogeneous Targets  

Science Conference Proceedings (OSTI)

A new technique for generating range oversampled profiles of Doppler radar signals that have been backscattered by distributed targets is presented in this paper. The technique was developed for spaceborne cloud radars, but it can just as well be ...

N. A. J. Schutgens

2008-09-01T23:59:59.000Z

207

Dual-Polarization Radar Characteristics of an Apartment Fire  

Science Conference Proceedings (OSTI)

Dual-polarimetric microwave wavelength radar observations of an apartment fire in Huntsville, Alabama, on 3 March 2008 are examined to determine the radar-observable properties of ash and fire debris lofted into the atmosphere. Dual-polarimetric ...

Thomas A. Jones; Sundar A. Christopher; Walt Petersen

2009-10-01T23:59:59.000Z

208

Retrieval of Reflectivity in a Networked Radar Environment  

Science Conference Proceedings (OSTI)

A system for reflectivity and attenuation retrieval for rain medium in a networked radar environment is described. Electromagnetic waves backscattered from a common volume in networked radar systems are attenuated differently along the different ...

V. Chandrasekar; S. Lim

2008-10-01T23:59:59.000Z

209

Evaluation of a 35 GHz Radar for Cloud Physics Research  

Science Conference Proceedings (OSTI)

A 1960 35 GHz radar has been modernized through the use of solid state electronics, Dopplerization and improved data-display capabilities. Radars of this frequency are particularly useful for observing the internal structures of clouds and for ...

Peter V. Hobbs; Nathan T. Funk; Richard R. Weiss Sr.; John D. Locatelli; Kumud R. Biswas

1985-03-01T23:59:59.000Z

210

On the Use of Radars for Operational Wind Profiling  

Science Conference Proceedings (OSTI)

The application of clear-air radars to operational wind profiling is considered. Several alternative techniques for determining atmospheric winds from radars are surveyed and, in light of the current interest in operational applications, the ...

B. B. Balsley; K. S. Gage

1982-09-01T23:59:59.000Z

211

95-GHz Polarimetric Radar Measurements of Orographic Cap Clouds  

Science Conference Proceedings (OSTI)

The use of millimeter-wavelength radars for cloud microphysical research was investigated in experiments at the Elk Mountain Observatory near Laramie, Wyoming, between April 1990 and March 1992. The 95-GHz polarimetric radar used in these ...

Andrew Pazmany; James Mead; Robert McIntosh; Mark Hervig; Robert Kelly; Gabor Vali

1994-02-01T23:59:59.000Z

212

Factors Affecting the Accuracy of SHOWEX HF Radar Wave Measurements  

Science Conference Proceedings (OSTI)

Ocean Surface Current Radar (OSCR) HF radar measurements of ocean waves and currents were made during the Shoaling Waves Experiment (SHOWEX) in the fall of 1999. During some periods, at some locations, good quality wave measurements were ...

Lucy R. Wyatt; Guennadi Liakhovetski; Hans C. Graber; Brian K. Haus

2005-07-01T23:59:59.000Z

213

A Dual-Wavelength Radar Method to Measure Snowfall Rate  

Science Conference Proceedings (OSTI)

A dual-wavelength radar method to estimate snowfall rate has been developed. The method suggests taking simultaneous and collocated reflectivity measurements at two radar wavelengths. Snowfall backscattering at one of these wavelengths should be ...

Sergey Y. Matrosov

1998-11-01T23:59:59.000Z

214

International Weather-Radar Networking in Western Europe  

Science Conference Proceedings (OSTI)

During the last few years there has been considerable activity in Western Europe aimed at establishing national radar networks. Concurrent with this work, several bilateral agreements to exchange weather-radar data across national boundaries have ...

C. G. Collier; C. A. Fair; D. H. Newsome

1988-01-01T23:59:59.000Z

215

The Effect of Radar Pulse Length on Cloud Reflectivity Statistics  

Science Conference Proceedings (OSTI)

When observing clouds with radars, there are a number of design parameters, such as transmitted power, antenna size, and wavelength, that can affect the detection threshold. In making calculations of radar thresholds, also known as minimum ...

Taneil Uttal; Robert A. Kropfli

2001-06-01T23:59:59.000Z

216

A Radar Study of the Plasma and Geometry of Lightning  

Science Conference Proceedings (OSTI)

Radar measurements and model studies are combined to investigate the plasma condition and the physical structure of lightning in thunderclouds. The lightning radar target is inferred to be an arclike plasma whose temperature exceeds 5000 K, ...

Earle R. Williams; Spiros G. Geotis; A. B. Bhattacharya

1989-05-01T23:59:59.000Z

217

Heating Profiles Derived From Cm-wavelength Radar During TWP...  

NLE Websites -- All DOE Office Websites (Extended Search)

Heating Profiles Derived From Cm-wavelength Radar During TWP-ICE Heating Profiles Derived From Cm-wavelength Radar During TWP-ICE Courtney Schumacher and Kaycee Frederick Courtney...

218

Spotlight-Mode Synthetic Aperture Radar: A Signal Processing Approach  

Science Conference Proceedings (OSTI)

From the Publisher:Spotlight-mode Synthetic Aperture Radar: A Signal Processing Approach describes an important mode of synthetic aperture radar (SAR) imaging, known as spotlight-mode SAR. By treating the subject via the principles of signal processing, ...

Paul Thompson; Daniel E. Wahl; Paul H. Eichel; Dennis C. Ghiglia; Charles V. Jakowatz

1996-01-01T23:59:59.000Z

219

Auxiliary Signal Processing System for a Multiparameter Radar  

Science Conference Proceedings (OSTI)

The design of an auxiliary signal processor for a multiparameter radar is described with emphasis on low cost, quick development, and minimum disruption of radar operations. The processor is based around a low-cost digital signal processor card ...

V. Chandrasekar; G. R. Gray; I. J. Caylor

1993-06-01T23:59:59.000Z

220

RADIAL-BASED NOISE POWER ESTIMATION FOR WEATHER RADARS  

Science Conference Proceedings (OSTI)

A radar antenna intercepts thermal radiation from various sources including the ground, the sun, the sky, precipitation and man-made radiators. In the radar receiver, this external radiation produces noise that constructively adds to the receiver ...

Igor R. Ivi?; Christopher Curtis; Sebastián M. Torres

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Procedures to Improve the Accuracy of Airborne Doppler Radar Data  

Science Conference Proceedings (OSTI)

The navigation correction method proposed in Testud et al. (referred to as the THL method) systematically identifies uncertainties in the aircraft Inertial Navigation System and errors in the radar-pointing angles by analyzing the radar returns ...

Brian L. Bosart; Wen-Chau Lee; Roger M. Wakimoto

2002-03-01T23:59:59.000Z

222

Estimating Urban Canopy Parameters Using Synthetic Aperture Radar Data  

Science Conference Proceedings (OSTI)

This paper introduces a remote sensing–based approach to rapidly derive urban morphological characteristics using radar satellite data. The approach is based on the expectation that the magnitude of the synthetic aperture radar (SAR) backscatter ...

Indumathi Jeyachandran; Steven J. Burian; Stephen W. Stetson

2010-04-01T23:59:59.000Z

223

Tracking system for photon-counting laser radar  

E-Print Network (OSTI)

The purpose of this thesis is to build the tracking system for a photon-counting laser radar specifically a laser radar that has the ability to perform direct and coherent detection measurement at low signal levels with ...

Chang, Joshua TsuKang

2007-01-01T23:59:59.000Z

224

VHF and UHF Doppler Radars as Tools for Synoptic Research  

Science Conference Proceedings (OSTI)

Applications of VHF and UHF Doppler radars to research in synoptic meteorology are reviewed. We find that these radars show great potential for studies of large scales, but the area of research where the instruments really excel is in studying ...

M. F. Larsen; J. Röttger

1982-09-01T23:59:59.000Z

225

Mean Vertical Motions Seen by Radar Wind Profilers  

Science Conference Proceedings (OSTI)

Radar wind profilers have been used to measure directly the vertical motion above the radar site. Mean values of vertical motions in the troposphere and lower stratosphere reported at sites in and near mountains are often several centimeters per ...

G. D. Nastrom; T. E. VanZandt

1994-08-01T23:59:59.000Z

226

A Statistical Approach to Ground Radar-Rainfall Estimation  

Science Conference Proceedings (OSTI)

This paper presents development of a statistical procedure for estimation of ensemble rainfall fields from a combination of ground radar observations and in situ rain gauge measurements. The uncertainty framework characterizes radar-rainfall ...

Alemu Tadesse; Emmanouil N. Anagnostou

2005-11-01T23:59:59.000Z

227

Estimation of Atmospheric Duct Structure Using Radar Sea Clutter  

Science Conference Proceedings (OSTI)

Retrieving atmospheric refractivity profiles from the sea surface backscattered radar clutter is known as the refractivity-from-clutter (RFC) technique. Because the relationship between refractivity and radar sea clutter is clearly nonlinear and ...

Zhao Xiaofeng; Huang Sixun

2012-09-01T23:59:59.000Z

228

The New French Operational Radar Rainfall Product. Part II: Validation  

Science Conference Proceedings (OSTI)

A new operational radar-based rainfall product has been developed at Météo-France and is currently being deployed within the French operational network. The new quantitative precipitation estimation (QPE) product is based entirely on radar data ...

P. Tabary; J. Desplats; K. Do Khac; F. Eideliman; C. Gueguen; J-C. Heinrich

2007-06-01T23:59:59.000Z

229

Operational Monitoring of Radar Differential Reflectivity Using the Sun  

Science Conference Proceedings (OSTI)

A method for the daily monitoring of the differential reflectivity bias for polarimetric weather radars is presented. Sun signals detected in polar volume data produced during operational scanning of the radar are used. This method is an ...

Iwan Holleman; Asko Huuskonen; Rashpal Gill; Pierre Tabary

2010-05-01T23:59:59.000Z

230

The Rain Profiling Algorithm Applied to Polarimetric Weather Radar  

Science Conference Proceedings (OSTI)

The algorithm developed in this paper for ground-based polarimetric radars is derived from those used for the spaceborne rain radar of TRMM (Tropical Rainfall Measurement Mission)—the so-called rain profiling algorithms. The characteristic of ...

Jacques Testud; Erwan Le Bouar; Estelle Obligis; Mustapha Ali-Mehenni

2000-03-01T23:59:59.000Z

231

Beam Multiplexing Using the Phased-Array Weather Radar  

Science Conference Proceedings (OSTI)

The recently installed S-band phased-array radar (PAR) at the National Weather Radar Testbed (NWRT) offers fast and flexible beam steering through electronic beam forming. This capability allows the implementation of a novel scanning strategy ...

Tian-You Yu; Marko B. Orescanin; Christopher D. Curtis; Dusan S. Zrni?; Douglas E. Forsyth

2007-04-01T23:59:59.000Z

232

Dual-wavelength polarimetric radar analyses of tornadic debris signatures  

Science Conference Proceedings (OSTI)

Statistical properties of tornado debris signatures (TDSs) are investigated using S- and C-band polarimetric radar data with comparisons to damage surveys and satellite imagery. Close proximity of the radars to the 10 May 2010 Moore-Oklahoma City ...

David J. Bodine; Robert D. Palmer; Guifu Zhang

233

Weather Radar Polarimetry-Trends Toward Operational Applications  

Science Conference Proceedings (OSTI)

This is a version of a speech presented at the 27th Conference on Radar Meteorology. Relative advantages of polarimetry are contrasted with the advantages accrued by the introduction of radar into meteorology and by the addition of Doppler ...

Dušan S. Zrni?

1996-07-01T23:59:59.000Z

234

Coastal Oceanography Applications of Digital Image Data from Marine Radar  

Science Conference Proceedings (OSTI)

A marine radar attached to a digital image capture system has been adapted for deployment from shore sites. Optimum operating parameters have been identified in relation to the resolution and sampling capabilities of both the radar and the ...

I. S. Robinson; N. P. Ward; C. P. Gommenginger; M. A. Tenorio-Gonzales

2000-05-01T23:59:59.000Z

235

Gust Front Characteristics as Detected by Doppler Radar  

Science Conference Proceedings (OSTI)

Gust fronts produce low altitude wind shear that can be hazardous to aircraft operations, especially during takeoff and landing. Radar meteorologists have long been able to identify gust front signatures in Doppler radar data, but in order to use ...

Diana L. Klingle; David R. Smith; Marilyn M. Wolfson

1987-05-01T23:59:59.000Z

236

Radar Observations of the 3 May 1999 Oklahoma City Tornado  

Science Conference Proceedings (OSTI)

The 3 May 1999 Oklahoma City storm is unique from a weather radar perspective because a long-track violent tornado passed within close range of several Doppler radars, because a detailed damage survey was conducted immediately after the event, ...

Donald W. Burgess; Michael A. Magsig; Joshua Wurman; David C. Dowell; Yvette Richardson

2002-06-01T23:59:59.000Z

237

Stationary liquid drops in Lorentz-Minkowski space  

E-Print Network (OSTI)

This paper analyzes the configurations of shapes that shows a spacelike liquid drop in Minkowski space deposited over a spacelike plane $\\Pi$. We assume the presence of a uniform gravity field directed toward $\\Pi$ and that the volume of the drop is prescribed. Our interest are the liquid drops that are critical points of the energy of the corresponding mechanical system and we will say then that the liquid drop is stationary. In such case, the liquid-air interface is determined by the condition that the mean curvature is a linear function of distance from $\\Pi$ and that the drop makes a constant hyperbolic angle of contact with the plate $\\Pi$. As first result, we shall prove that the liquid drop must be rotational symmetric with respect to an axis orthogonal to $\\Pi$. Then we prove the existence and uniqueness of symmetric solutions for a given angle of contact with $\\Pi$. Finally, we shall study the shapes that a liquid drop can adopt in terms of its size. So, we shall derive estimates of its height, volume and area of the wetted surface on $\\Pi$.

Rafael Lopez

2005-01-12T23:59:59.000Z

238

Two-phase pressure drop in vertical crossflow across a horizontal tube bundle  

Science Conference Proceedings (OSTI)

An experimental investigation has been made to evaluate the friction, acceleration, and hydrostatic pressure drops in two-phase vertical crossflow across a horizontal tube bundle through the measurement of the void fraction and determination of the two-phase friction multiplier. The void fractions were found to increase with increasing mass velocity for a fixed quality level. The two-phase friction multiplier increased with increasing mass velocity for a fixed value of the Martinelli parameter in both slug and spray flow and decreased with increasing mass velocity in bubbly flows. The void fraction and two-phase friction multiplier data were correlated and used to predict with very good results the total pressure drop occurring in simulated diabatic flow tests and in actual diabatic tests using R-113.

Schrage, D.S.; Hsu, J.T.; Jensen, M.K.

1988-01-01T23:59:59.000Z

239

Stability issues in IC Low Drop Out voltage regulators  

E-Print Network (OSTI)

Performance issues of IC Low Drop Out (LDO) voltage regulators, with specific reference to stability, are discussed in this thesis. Evaluation of existing frequency compensation schemes and their performances across operating loads is presented. The problem of instability of the LDO voltage regulator at low Electo Static Resistance (ESR) of the load capacitors and the consequences of this problem are highlighted. As a solution to some of the discussed problems, an alternate LDO voltage regulator topology that is stable with low Electro Static Resistance (ESR) capacitive loads is presented. The proposed scheme, instead of relying on the zero generated by the load capacitor and its ESR combination for stability, generates a zero internally. The LDO voltage regulator is implemented and fabricated in AMI 0.5mm CMOS technology through MOSIS service. It is demonstrated that this scheme realizes robust frequency compensation, facilitates use of Multi Layer Ceramic Capacitors (MLCC) for load of LDO regulators, and improves transient response and noise performance. Test results from the prototype provide an evaluation of the most important parameters of the regulator: ground current, load regulation, line regulation, output noise and start-up time.

Chava, Krishna Chaitanya

2002-01-01T23:59:59.000Z

240

Adaptive Range Oversampling to Achieve Faster Scanning on the National Weather Radar Testbed Phased-Array Radar  

Science Conference Proceedings (OSTI)

This paper describes a real-time implementation of adaptive range oversampling processing on the National Weather Radar Testbed phased-array radar. It is demonstrated that, compared to conventional matched-filter processing, range oversampling can ...

Christopher D. Curtis; Sebastián M. Torres

2011-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Can a VHF Doppler Radar Provide Synoptic Wind Data? A Comparison of 30 Days of Radar and Radiosonde Data  

Science Conference Proceedings (OSTI)

A number of experiments have shown that UHF and VHF Doppler radars can make “clear air” wind measurements in the troposphere and lower stratosphere, even in the presence of clouds and precipitation. Past comparisons of radar and rawinsonde ...

Miguel Folkmar Larsen

1983-10-01T23:59:59.000Z

242

Polarization Radar Measurements in Rain at 5 and 9 GHz  

Science Conference Proceedings (OSTI)

There is increased interest in dual-polarization radar measurements at 9 and 5 GHz not only for scientific reasons but also because such radars are less expensive to build and are easier to transport than 3-GHz S-band radars. Unfortunately, ...

A. R. Jameson

1991-11-01T23:59:59.000Z

243

The New French Operational Polarimetric Radar Rainfall Rate Product  

Science Conference Proceedings (OSTI)

In 2012 the Météo France metropolitan operational radar network consists of 24 radars operating at C and S bands. In addition, a network of four X-band gap-filler radars is being deployed in the French Alps. The network combines polarimetric and ...

Jordi Figueras i Ventura; Pierre Tabary

2013-08-01T23:59:59.000Z

244

Quality Assessment of Weather Radar Wind Profiles during Bird Migration  

Science Conference Proceedings (OSTI)

Wind profiles from an operational C-band Doppler radar have been combined with data from a bird tracking radar to assess the wind profile quality during bird migration. The weather radar wind profiles (WRWPs) are retrieved using the well-known ...

Iwan Holleman; Hans van Gasteren; Willem Bouten

2008-12-01T23:59:59.000Z

245

Fragmentation of Freezing Drops in Shallow Maritime Frontal Clouds  

Science Conference Proceedings (OSTI)

Images of frozen drops with pieces missing were collected on two days of airborne sampling in shallow supercooled stratiform frontal clouds in the coastal waters of Washington State. In those limited regions where ice appeared to be newly formed, ...

Arthur L. Rangno

2008-04-01T23:59:59.000Z

246

Production Functions of Film Drops by Bursting Bubbles  

Science Conference Proceedings (OSTI)

Experimental results of Blanchard and Syzdek and of Resch and Afeti on the production of film drops by bubbles bursting at the surface of seawater were parameterized earlier by Wu. More recently, comprehensive observations have been carried out ...

Jin Wu

2001-11-01T23:59:59.000Z

247

Characterizations of Aircraft Icing Environments that Include Supercooled Large Drops  

Science Conference Proceedings (OSTI)

Measurements of aircraft icing environments that include supercooled large drops (SLD) greater than 50 ?m in diameter have been made during 38 research flights. These flights were conducted during the First and Third Canadian Freezing Drizzle ...

Stewart G. Cober; George A. Isaac; J. Walter Strapp

2001-11-01T23:59:59.000Z

248

Experimental study and parameterization of gas absorption by water drops  

Science Conference Proceedings (OSTI)

Mass transfer between liquid drops and a continuous gas phase occurs in a large number of industrial processes and many engineering disciplines such as chemical and nuclear engineering, atmospheric sciences, environmental engineering, and so on. Liquid-phase mass-transfer coefficients are determined for the absorption of sulfur dioxide by water drops larger than 1.1 mm in dia. A local model based on the large eddy interfacial model proposed for Fortescue and Pearson (1967) is obtained by the characteristic interfacial scaling. In particular, the agitation process of the liquid phase in the interfacial region is characterized by the interfacial liquid friction velocity. Experiments of sulfur dioxide absorption and desorption from large individually free-falling water drops are also carried out in a 5-m rain shaft under various environmental conditions. These experimental results agree well with those from the local model characterizing the interfacial process in water drops greater than 1.1 mm in dia.

Amokrane, H.; Saboni, A.; Caussade, B. (CNRS, Toulouse (France). Inst. de Mecanique des Fluides)

1994-12-01T23:59:59.000Z

249

Gas Absorption into a Moving Spheroidal Water Drop  

Science Conference Proceedings (OSTI)

Theoretical and experimental studies have been carried out to describe the absorption of sulfur dioxide by moving spheroidal water drops under transient flow conditions. These investigations allow the determination of the rate at which SO2 is ...

H. Amokrane; B. Caussade

1999-06-01T23:59:59.000Z

250

Drop-in replacement biofuels : meeting the challenge  

E-Print Network (OSTI)

This thesis presents a discussion on the challenges that must be met to fulfill the U.S. Navy's strategic imperatives for its energy vision. It provides an introduction to drop-in replacement biofuels, the options amongst ...

Bhargava, Alok (Alok Kishore)

2011-01-01T23:59:59.000Z

251

Spume Drops Produced by the Wind Tearing of Wave Crests  

Science Conference Proceedings (OSTI)

The wind tearing of breaking wave crests produces spume drops. The authors report preliminary laboratory data from direct and unambiguous observation of this process under various wind conditions using a video imaging technique. Results include ...

Magdalena Anguelova; Richard P. Barber Jr.; Jin Wu

1999-06-01T23:59:59.000Z

252

A Survey of Radar Rain Measurement Techniques  

Science Conference Proceedings (OSTI)

Several methods used to estimate rainfall rate R are surveyed. The distribution N(D) of drop sizes is of central importance in determining the reflectivity factor Z, attenuation rate K, and R. With single-parameter measurement techniques either ...

Richard J. Doviak

1983-05-01T23:59:59.000Z

253

Multifrequency and multistatic inverse synthetic aperture radar, with application to FM passive radar  

Science Conference Proceedings (OSTI)

This paper deals with the imaging of a moving target using a multifrequency and multistatic radar consisting in one receiver and several narrowband transmitters. Considering two hypotheses about the studied target, we derive two multistatic inverse synthetic ...

Guillaume Ginolhac; Françoise Schmitt; Franck Daout; Philippe Forster

2010-01-01T23:59:59.000Z

254

Effects of Raindrop-Size Distribution Variation within the Radar Scattering Volume on Radar Observables  

Science Conference Proceedings (OSTI)

Dual linear polarization weather radars measure as primary observables the mean power P?H, and P?V, corresponding to returns at horizontal and vertical polarizations, respectively. Differential reflectivity ZDR is defined as the ratio between ...

G. Scarchilli; E. Gorgucci; T. A. Seliga; K. Aydin

1990-12-01T23:59:59.000Z

255

New directions for gravitational wave physics via "Millikan oil drops"  

E-Print Network (OSTI)

"Millikan oil drops" are drops of superfluid helium coated with electrons, and levitated in a strong, inhomogeneous magnetic field. When the temperature of the system becomes very low compared to the cyclotron gap energy, the system remains in its quantum ground state. Two such levitated charged drops can have their charge-to-mass ratio critically adjusted so that the forces of gravity and electricity between the drops are in balance. Then it is predicted that the amount of scattered electromagnetic and gravitational radiation from the drops are equalized, along with these two kinds of forces. The cross sections for the scattering of the two kinds of radiation can become large, hard-sphere cross-sections at the first Mie resonance, due to the hard-wall boundary conditions on the surfaces of the spheres for both kinds of radiations. An efficient quantum transduction process between electromagnetic and gravitational radiation by such a pair of drops is predicted at microwave frequencies, and a Hertz-like experiment is proposed. A more practical implementation of these ideas to use pairs of levitated, charged superconducting spheres is briefly discussed.

Raymond Y. Chiao

2009-04-25T23:59:59.000Z

256

Microwave Dielectric Heating of Drops in Microfluidic Devices  

E-Print Network (OSTI)

We present a technique to locally and rapidly heat water drops in microfluidic devices with microwave dielectric heating. Water absorbs microwave power more efficiently than polymers, glass, and oils due to its permanent molecular dipole moment that has a large dielectric loss at GHz frequencies. The relevant heat capacity of the system is a single thermally isolated picoliter drop of water and this enables very fast thermal cycling. We demonstrate microwave dielectric heating in a microfluidic device that integrates a flow-focusing drop maker, drop splitters, and metal electrodes to locally deliver microwave power from an inexpensive, commercially available 3.0 GHz source and amplifier. The temperature of the drops is measured by observing the temperature dependent fluorescence intensity of cadmium selenide nanocrystals suspended in the water drops. We demonstrate characteristic heating times as short as 15 ms to steady-state temperatures as large as 30 degrees C above the base temperature of the microfluidic device. Many common biological and chemical applications require rapid and local control of temperature, such as PCR amplification of DNA, and can benefit from this new technique.

David Issadore; Katherine J. Humphry; Keith A. Brown; Lori Sandberg; David Weitz; Robert M. Westervelt

2009-01-09T23:59:59.000Z

257

Drop shapes and fall speeds in rain: two contrasting examples  

Science Conference Proceedings (OSTI)

Two rain events are analyzed using two collocated 2D-video disdrometers (2DVD) and a C band polarimetric radar at 15 km distance. Both events had moderate-to-intense rainfall rates, but the second event had an embedded convective line. For the ...

M. Thurai; V. N. Bringi; W. A. Petersen; P. N. Gatlin

258

Insects Observed Using Dual-Polarization Radar  

Science Conference Proceedings (OSTI)

Two radars of different characteristics were used on a clear night in early summer to investigate the nature of the clear air echoes. It is deduced that most of the echoes on this evening were due to insects rather than atmospheric turbulence or ...

Eugene A. Mueller; Ronald P. Larkin

1985-03-01T23:59:59.000Z

259

A Typhoon Observed with the MU Radar  

Science Conference Proceedings (OSTI)

During the passage of Typhoon 8719 a 60-h continuous observation was made of the troposphere and the lower stratosphere with the MU (middle and upper atmosphere) radar. Height profiles of the wind velocity vector were measured every 2.5 min with ...

Toru Sato; Naoki Ao; Mamoru Yamamoto; Shoichiro Fukao; Toshitaka Tsuda; Susumu Kato

1991-03-01T23:59:59.000Z

260

Radar Measurement of Cooling Tower Drift  

Science Conference Proceedings (OSTI)

A method of radar measurement of drift, generated by the wet cooling towers of power plants, is proposed. The water given off by the evaporative towers consists of two kinds of droplets: the recondensation droplets—generally less than 20 ?m in ...

Henri Sauvageot

1989-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

DOW Radar Observations of Wind Farms  

Science Conference Proceedings (OSTI)

The growth of the wind industry in recent years has motivated investigation into wind farm interference with the operation of the nationwide Weather Surveillance Radar-1988 Doppler (WSR-88D) network. Observations of a wind farm were taken with a Doppler ...

Mallie Toth; Erin Jones; Dustin Pittman; David Solomon

2011-08-01T23:59:59.000Z

262

Generating nonlinear FM chirp waveforms for radar.  

SciTech Connect

Nonlinear FM waveforms offer a radar matched filter output with inherently low range sidelobes. This yields a 1-2 dB advantage in Signal-to-Noise Ratio over the output of a Linear FM waveform with equivalent sidelobe filtering. This report presents design and implementation techniques for Nonlinear FM waveforms.

Doerry, Armin Walter

2006-09-01T23:59:59.000Z

263

Transmitter passband requirements for imaging radar.  

SciTech Connect

In high-power microwave power amplifiers for radar, distortion in both amplitude and phase should generally be expected. Phase distortions can be readily equalized. Some amplitude distortions are more problematic than others. In general, especially for SAR using LFM chirps, low frequency modulations such as gain slopes can be tolerated much better than multiple cycles of ripple across the passband of the waveform.

Doerry, Armin Walter

2012-12-01T23:59:59.000Z

264

Discover the Benefits of Radar Imaging | Open Energy Information  

Open Energy Info (EERE)

Discover the Benefits of Radar Imaging Discover the Benefits of Radar Imaging Jump to: navigation, search OpenEI Reference LibraryAdd to library Web Site: Discover the Benefits of Radar Imaging Author William V. Parker Published EIJ Earth Imaging Journal, 2012 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Discover the Benefits of Radar Imaging Citation William V. Parker. Discover the Benefits of Radar Imaging [Internet]. 2012. N/A. EIJ Earth Imaging Journal. [updated 2013/09/20;cited 2013/09/20]. Available from: http://eijournal.com/2012/discover-the-benefits-of-radar-imaging GEOTHERMAL ENERGYGeothermal Home Web Site: Discover the Benefits of Radar imaging Details Abstract: Unavailable Author(s): William V. Parker Published: EIJ Earth Imaging Journal, 2012

265

Gas-liquid pressure drop in vertical internally wavy 90 bend  

SciTech Connect

Experiments of air water two-phase flow pressure drop in vertical internally wavy 90 bend have been carried out. The tested bends are flexible and made of stainless steel with inner diameter of 50 mm and various curvature radiuses of 200, 300, 400 and 500 mm. The experiments were performed under the following conditions of two-phase parameters; mass flux from 350 to 750 kg/m{sup 2} s. Gas quality from 1% to 50% and system pressure from 4 to 7.5 bar. The results demonstrate that the effect of the above-mentioned parameters is very significant at high ranges of mass flow quality. Due to the increasing of two-phase flow resistance, energy dissipations, friction losses and interaction of the two-phases in the vertical internally wavy 90 bend the total pressure drops are perceptible about 2-5 times grater than that in smooth bends. Based on the mass and energy balance as well as the presented experimental results, new empirical correlation has been developed to calculate the two-phase pressure drop and hence the two-phase friction factor of the tested bends. The correlation includes the relevant primary parameter, fit the data well, and is sufficiency accurate for engineering purposes. (author)

Benbella, Shannak [Department of Mechanical Engineering, Al-Balqa Applied University, Al-Huson University College, P.O. Box 50, Al-Huson (Jordan); Al-Shannag, Mohammad; Al-Anber, Zaid A. [Department of Chemical Engineering, Faculty of Engineering Technology, Al-Balqa Applied University, P.O. Box 15008, Marka 11134, Amman (Jordan)

2009-01-15T23:59:59.000Z

266

Edible Fat Laboratory Proficiency Testing Program  

Science Conference Proceedings (OSTI)

Lab Proficiency Testing for Edible Fat to test OSI,FFA, AOCS Color, Capillary Melting Point, Iodine Value, Lovibond Color, Mettler Dropping Point, a;-Monoglycerides, SFC Edible Fat Laboratory Proficiency Testing Program Laboratory Proficiency Program (LPP

267

A digital ASIC implementation of a video filter for synthetic aperture radar  

SciTech Connect

Two GaAs ASICs have been designed and implemented for a synthetic aperture radar which eliminate the dc bias in the sampled video data and increase the signal to noise ratio by summing the data across consecutive bursts. The High Pass Filter and Presummer ASICs process data at a maximum sample rate of 170 MHz and 125 MHz respectively. The chips are fully ECL and TTL compatible. The high pass filter is packaged in GigaBit's standard 132-pin ceramic package, while the presummer is packaged in TriQuint's standard 196-pin ceramic package. The presummer has been successfully tested in a prototype synthetic aperture radar at Sandia National Laboratories. The high pass filter has been successfully tested in a high speed test fixture. These ASICs provide flexibility and low power consumption at data rates previously unattainable with comparable hardware. 1 refs., 4 figs.

Remund, B.L. (Sandia National Labs., Albuquerque, NM (United States)); Chow, J.; Salinas, J. (GigaBit Logic, Newbury Park, CA (United States))

1991-01-01T23:59:59.000Z

268

Energy Innovator Drops Costs for Titanium Metalwork | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Innovator Drops Costs for Titanium Metalwork Innovator Drops Costs for Titanium Metalwork Energy Innovator Drops Costs for Titanium Metalwork March 13, 2012 - 12:42pm Addthis Michael Hess Michael Hess Former Digital Communications Specialist, Office of Public Affairs What are the key facts? Iowa Powder Atomization Technology is one of 36 companies that licensed technology under an agreement with the National Lab as part of the America's Next Top Energy Innovator program. Titanium is the stuff aircrafts are made of, at least the important parts. It's an obvious material choice for aircraft engines and airframes with its high strength-to-weight ratio and resistance to corrosion. However, shaping the metal into complex shapes can be expensive. Using a heavier, easier-to-craft metal can be just as expensive because adding weight to an

269

EA-1933: Yakama Nation Drop 4 Hydropower Project, Yakama Nation  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

933: Yakama Nation Drop 4 Hydropower Project, Yakama Nation 933: Yakama Nation Drop 4 Hydropower Project, Yakama Nation Reservation, WA EA-1933: Yakama Nation Drop 4 Hydropower Project, Yakama Nation Reservation, WA SUMMARY DOE is a cooperating agency with the Department of the Interior's Bureau of Indian Affairs as a lead agency for the preparation of an EA to evaluate the potential environmental impacts of a proposal by the Confederated Tribes and Bands of the Yakama Nation Department of Natural Resources to install an inline turbine on the Wapato Irrigation Project (WIP) Main Canal to generate approximately one megawatt of supplemental hydroelectric power. The Main Canal is a non-fish bearing irrigation canal within the WIP water conveyance system. The project site is located two miles southwest of Harrah, Washington.

270

An experimental investigation of pressure drop of aqueous foam in laminar tube flow  

DOE Green Energy (OSTI)

This report is the first of two detailing pressure-drop and heat-transfer measurements made at the Foam Flow Heat Transfer Loop. The work was motivated by a desire to extend the application of aqueous foam from petroleum drilling to geothermal drilling. Pressure-drop measurements are detailed in this report; a forthcoming report (SAND85-1922) will describe the heat-transfer measurements. The pressure change across a 2.4-m (8-ft) length of the 2.588-cm (1.019-in.) ID test section was measured for liquid volume fractions between 0.05 and 0.35 and average velocities between 0.12 and 0.80 m/s (0.4 and 2.6 ft/s). The resulting pressure-drop/flow-rate data were correlated to a theoretical model for a Bingham plastic. Simple expressions for the dynamic viscosity and the yield stress as a function of liquid volume fraction were estimated.

Blackwell, B.F.; Sobolik, K.B.

1987-04-01T23:59:59.000Z

271

Development of a Drillrod/Telemetry Radar  

Science Conference Proceedings (OSTI)

Efficient extraction of deeply buried natural resources is dependent upon accurate geologic models. The model becomes the basis for developing plans for extraction of the resource. Geoscientists working in geothermal and hydrocarbon recovery have a great deal in common with fellow geoscientists working in the mining industry. They appreciate the intractable problem of increasing the depth of investigation to tens of meters from the wellbore. The goal of this project was to develop a borehole radar tool to acquire data within tens of meters from the wellbore. For geothermal and hydrocarbon applications, the tool was to acquire data for mapping fractures surrounding the wellbore. In mining of coal, the radar acquires data for determining coal seam thickness and detecting geologic anomalies ahead of mining.

Raton Technology Research, Inc.

1999-11-12T23:59:59.000Z

272

Synthetic Aperture Radar Persistent Scatterer Interferometry (PSInSAR) |  

Open Energy Info (EERE)

Synthetic Aperture Radar Persistent Scatterer Interferometry (PSInSAR) Synthetic Aperture Radar Persistent Scatterer Interferometry (PSInSAR) Jump to: navigation, search OpenEI Reference LibraryAdd to library Web Site: Synthetic Aperture Radar Persistent Scatterer Interferometry (PSInSAR) Author Parviz Tarikhi Published N/A, 2010 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Synthetic Aperture Radar Persistent Scatterer Interferometry (PSInSAR) Citation Parviz Tarikhi. Synthetic Aperture Radar Persistent Scatterer Interferometry (PSInSAR) [Internet]. 2010. Tunis, Tunisia. N/A. [cited 2013/09/17]. Available from: http://parviztarikhi.files.wordpress.com/2010/05/3psinsar-i-parviz_tarikhi.pdf Retrieved from "http://en.openei.org/w/index.php?title=Synthetic_Aperture_Radar_Persistent_Scatterer_Interferometry_(PSInSAR)&oldid=682949"

273

ARM - Field Campaign - 2001 Multi-Frequency Radar IOP  

NLE Websites -- All DOE Office Websites (Extended Search)

govCampaigns2001 Multi-Frequency Radar IOP govCampaigns2001 Multi-Frequency Radar IOP Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : 2001 Multi-Frequency Radar IOP 2001.03.01 - 2001.09.30 Lead Scientist : Stephen Sekelsky Data Availability http://abyss.ecs.umass.edu For data sets, see below. Summary Install UMass and NOAA Aeronomy Laboratory "guest instrument" radars at the SGP CART site adjacent to the MMCR system. Both the UMass and NOAA Aeronomy Laboratory systems will run autonomously for approximately a six month period. Description Scientific hypothesis: A. Measurements from the University of Massachusetts (UMass) Cloud Profiling Radar System (CPRS) - 95/33 GHz Radar indicate that the 95 GHz channel is much less sensitive to insect clutter than the 35 GHz channel by

274

Vertical Velocity and Buoyancy Characteristics of Coherent Echo Plumes in the Convective Boundary Layer, Detected by a Profiling Airborne Radar  

Science Conference Proceedings (OSTI)

Aircraft and airborne millimeter-wave radar observations are used to interpret the dynamics of radar echoes and radar-inferred updrafts within the well-developed, weakly sheared continental convective boundary layer. Vertically pointing radar ...

Qun Miao; Bart Geerts; Margaret LeMone

2006-06-01T23:59:59.000Z

275

Scale Dependence of Radar Rainfall Uncertainty: Initial Evaluation of NEXRAD’s New Super-Resolution Data for Hydrologic Applications  

Science Conference Proceedings (OSTI)

This study explores the scale effects of radar rainfall accumulation fields generated using the new super-resolution level II radar reflectivity data acquired by the Next Generation Weather Radar (NEXRAD) network of the Weather Surveillance Radar-...

Bong-Chul Seo; Witold F. Krajewski

2010-10-01T23:59:59.000Z

276

An Evaluation of a 94-GHz Radar for Remote Sensing of Cloud Properties  

Science Conference Proceedings (OSTI)

The performance of a 94-GHz radar is evaluated for a variety of cloud conditions. Descriptions of the radar hardware, signal processing, and calibration provide an overview of the radar's capabilities. An important component of the signal ...

E. E. Clothiaux; M. A. Miller; B. A. Albrecht; T. P. Ackerman; J. Verlinde; D. M. Babb; R. M. Peters; W. J. Syrett

1995-04-01T23:59:59.000Z

277

Relationship between Radar-Estimated Precipitation and Synoptic Weather Patterns in the European Alps  

Science Conference Proceedings (OSTI)

A 9-yr (2000–08) analysis of precipitation characteristics for the central and western European Alps has been generated from ground-based operational weather radar data provided by the Swiss radar network. The radar-based precipitation analysis ...

James V. Rudolph; Katja Friedrich; Urs Germann

2011-05-01T23:59:59.000Z

278

An Early Performance Evaluation of the NEXRAD Dual Polarization Radar Rainfall Estimates for Urban Flood Applications  

Science Conference Proceedings (OSTI)

Dual polarization radars are expected to provide better rainfall estimates than single polarization radars due to their ability to characterize hydrometeor type. The goal of this study is to evaluate single and dual polarization radar rainfall ...

Luciana K. Cunha; James A. Smith; Mary Lynn Baeck; Witold F. Krajewski

279

Estimating Rainfall Intensities from Weather Radar Data: The Scale-Dependency Problem  

Science Conference Proceedings (OSTI)

Meteorological radar is a remote sensing system that provides rainfall estimations at high spatial and temporal resolutions. The radar-based rainfall intensities (R) are calculated from the observed radar reflectivities (Z). Often, rain gauge ...

Efrat Morin; Witold F. Krajewski; David C. Goodrich; Xiaogang Gao; Soroosh Sorooshian

2003-10-01T23:59:59.000Z

280

Hail Detection Using S- and C-Band Radar Reflectivity Difference  

Science Conference Proceedings (OSTI)

In reflectivity fields observed with conventional radar networks, hailstorm identification is not easy. In the present paper, a hailstorm detection method using two single-wavelength radars located far from each other is discussed. The two radars,...

Laurent Féral; Henri Sauvageot; Serge Soula

2003-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Eddy Dissipation Rates in Thunderstorms Estimated by Doppler Radar in Relation to Aircraft In Situ Measurements  

Science Conference Proceedings (OSTI)

High-resolution aircraft turbulence measurements, well coordinated with radar Doppler spectral width measurements, have been used to verify radar-estimated energy dissipation rates within thunderstorms anvils. The radar-estimated eddy dissipation ...

Peter Meischner; Robert Baumann; Hartmut Höller; Thomas Jank

2001-10-01T23:59:59.000Z

282

A Solo-based automated quality control algorithm for airborne tail Doppler radar data  

Science Conference Proceedings (OSTI)

An automated quality control pre-processing algorithm for removing non-weather radar echoes in airborne Doppler radar data has been developed. This algorithm can significantly reduce the time and experience level required for interactive radar ...

Michael M. Bell; Wen-Chau Lee; Cory A. Wolff; Huaqing Cai

283

An Experimental Study of Small-Scale Variability of Radar Reflectivity Using Disdrometer Observations  

Science Conference Proceedings (OSTI)

Analysis of data collected by four disdrometers deployed in a 1-km2 area is presented with the intent of quantifying the spatial variability of radar reflectivity at small spatial scales. Spatial variability of radar reflectivity within the radar ...

Benjamin J. Miriovsky; A. Allen Bradley; William E. Eichinger; Witold F. Krajewski; Anton Kruger; Brian R. Nelson; Jean-Dominique Creutin; Jean-Marc Lapetite; Gyu Won Lee; Isztar Zawadzki; Fred L. Ogden

2004-01-01T23:59:59.000Z

284

Effects of Radar Sampling on Single-Doppler Velocity Signatures of Mesocyclones and Tornadoes  

Science Conference Proceedings (OSTI)

Simulated WSR-88D (Weather Surveillance Radar-1988 Doppler) radar data were used to investigate the effects of discrete azimuthal sampling on Doppler velocity signatures of modeled mesocyclones and tornadoes at various ranges from the radar and ...

Vincent T. Wood; Rodger A. Brown

1997-12-01T23:59:59.000Z

285

Bollène-2002 Experiment: Radar Quantitative Precipitation Estimation in the Cévennes–Vivarais Region, France  

Science Conference Proceedings (OSTI)

The Bollène-2002 Experiment was aimed at developing the use of a radar volume-scanning strategy for conducting radar rainfall estimations in the mountainous regions of France. A developmental radar processing system, called Traitements ...

Guy Delrieu; Brice Boudevillain; John Nicol; Benoît Chapon; Pierre-Emmanuel Kirstetter; Hervé Andrieu; D. Faure

2009-07-01T23:59:59.000Z

286

The Kinetic Energy of Hailfalls. Part IV: Patterns of Hailpad and Radar Data  

Science Conference Proceedings (OSTI)

Ground-and radar-measured patterns of hail kinetic energy from eight hailstorms have been compared. The radar patterns were shifted horizontally in such a way that the correlation coefficient between the ground and radar data reaches a maximum. ...

W. Schmid; H. H. Schiesser; A. Waldvogel

1992-10-01T23:59:59.000Z

287

Inversion of synthetic aperture radar interferograms for sources...  

Open Energy Info (EERE)

Inversion of synthetic aperture radar interferograms for sources of production-related subsidence at the Dixie Valley geothermal field Jump to: navigation, search OpenEI Reference...

288

Ka-Band ARM Zenith Radar (KAZR) Instrument Handbook  

SciTech Connect

The Ka-band ARM zenith radar (KAZR) is a zenith-pointing Doppler cloud radar operating at approximately 35 GHz. The KAZR is an evolutionary follow-on radar to ARM's widely successful millimeter-wavelength cloud radar (MMCR). The main purpose of the KAZR is to provide vertical profiles of clouds by measuring the first three Doppler moments: reflectivity, radial Doppler velocity, and spectra width. At the sites where the dual-polarization measurements are made, the Doppler moments for the cross-polarization channel are also available. In addition to the moments, velocity spectra are also continuously recorded for each range gate.

Widener, K; Bharadwaj, N; Johnson, K

2012-03-06T23:59:59.000Z

289

Argonne radar meteorologist Scott Collis named one of Popular...  

NLE Websites -- All DOE Office Websites (Extended Search)

Physical Sciences from the Australian National University in 2007. Click to enlarge. Argonne radar meteorologist Scott Collis named one of Popular Science's 'Brilliant 10' By...

290

Forthcoming Upgrades to the ARM MMCRs: Improved Radar Processor...  

NLE Websites -- All DOE Office Websites (Extended Search)

Improved Radar Processor and Dual-Polarization K. P. Moran, B. E. Martner, and K. A. Clark National Oceanic and Atmospheric Administration Environmental Technology Laboratory...

291

What is Synthetic Aperture Radar? -- Sandia National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

What is Synthetic Aperture Radar? Environmental monitoring, earth-resource mapping, and military systems require broad-area imaging at high resolutions. Many times the imagery must...

292

Collision Rate of Small Graupel and Water Drops  

Science Conference Proceedings (OSTI)

An approach permitting one to calculate the collision efficiency and the collision kernel of spherical particles of different densities for Reynolds numbers up to 100 (300-?m-radius drops, or 700-?m-radius graupel) is presented. It is used for ...

A. Khain; M. Pinsky; M. Shapiro; A. Pokrovsky

2001-09-01T23:59:59.000Z

293

Drops of Energy Conserving Urban Water in California  

E-Print Network (OSTI)

in California to Reduce Greenhouse Gas Emissions improvements to their energy usage through efficiency measuresDrops of Energy Conserving Urban Water in California to Reduce Greenhouse Gas Emissions May 2011 School of Law's Center for Law, Energy & the Environment and UCLA School of Law's Environmental Law

Kammen, Daniel M.

294

PRESSURE DROP EVALUATION OF THE HYDROGEN CIRCULATION SYSTEM FOR JSNS  

SciTech Connect

In J-PARC, an intense spallation neutron source (JSNS) driven by a proton beam of 1 MW has selected supercritical hydrogen with a temperature of around 20 K and the pressure of 1.5 MPa as a moderator material. A hydrogen-circulation system, which consists of two pumps, an ortho-para hydrogen converter, a heater, an accumulator and a helium-hydrogen heat exchanger, has been designed to provide supercritical hydrogen to the moderators and remove the nuclear heating there. A hydrogen-circulation system is cooled through the heat exchanger by a helium refrigerator with the refrigeration power of 6.45 kW at 15.5 K. It is important for the cooling design of the hydrogen-circulation system to understand the pressure drops through the equipments. In this work, the pressure drop through each component was analyzed by using a CFD code, STAR-CD. The correlation of the pressure drops through the components that can describe the analytical results within 14% differences has been derived. It is confirmed that the pressure drop in the hydrogen circulation system would be estimated to be 37 kPa for the circulation flow rate of 160 g/s by using the correlations derived here, and is sufficiently lower than the allowable pump head of 100 kPa.

Tatsumoto, H.; Aso, T.; Ohtsu, K.; Kato, T.; Futakawa, M. [J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195 (Japan)

2010-04-09T23:59:59.000Z

295

Two phase pressure drop in inclined and vertical pipes  

E-Print Network (OSTI)

A method of calculating the pressure drop in inclined and vertical oil-gas wells is proposed. The data used to establish the method is from a variety of sources but is largely from air and water flowing in systems close ...

Griffith, P.

1973-01-01T23:59:59.000Z

296

Direct 4D-Var Assimilation of NCEP Stage IV Radar and Gauge Precipitation Data at ECMWF  

Science Conference Proceedings (OSTI)

Direct four-dimensional variational data assimilation (4D-Var) of NCEP stage IV radar and gauge precipitation observations over the eastern United States has been developed and tested in ECMWF’s global Integrated Forecasting System. This is the ...

Philippe Lopez

2011-07-01T23:59:59.000Z

297

Objective Determination of Cloud Heights and Radar Reflectivities Using a Combination of Active Remote Sensors at the ARM CART Sites  

Science Conference Proceedings (OSTI)

The U.S. Department of Energy’s Atmospheric Radiation Measurement (ARM) Program is deploying sensitive, millimeter-wave cloud radars at its Cloud and Radiation Test Bed (CART) sites in Oklahoma, Alaska, and the tropical western Pacific Ocean. The ...

Eugene E. Clothiaux; Thomas P. Ackerman; Gerald G. Mace; Kenneth P. Moran; Roger T. Marchand; Mark A. Miller; Brooks E. Martner

2000-05-01T23:59:59.000Z

298

Wideband Waveform Design Principles for Solid-State Weather Radars  

Science Conference Proceedings (OSTI)

The use of solid-state transmitters is becoming increasingly viable for atmospheric radars and is a key part of the strategy to realize any dense network of low-powered radars. However, solid-state transmitters have low peak powers and this ...

Nitin Bharadwaj; V. Chandrasekar

2012-01-01T23:59:59.000Z

299

Detailed Observations of Wind Turbine Clutter with Scanning Weather Radars  

Science Conference Proceedings (OSTI)

The wind power industry has seen tremendous growth over the past decade and with it has come the need for clutter mitigation techniques for nearby radar systems. Wind turbines can impart upon these radars a unique type of interference that is not ...

B. M. Isom; R. D. Palmer; G. S. Secrest; R. D. Rhoton; D. Saxion; T. L. Allmon; J. Reed; T. Crum; R. Vogt

2009-05-01T23:59:59.000Z

300

The Distribution of Rainfall over Oceans from Spaceborne Radars  

Science Conference Proceedings (OSTI)

A combination of rainfall estimates from the 13.8-GHz Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) and the 94-GHz CloudSat Cloud Profiling Radar (CPR) is used to assess the distribution of rainfall intensity over tropical ...

Wesley Berg; Tristan L’Ecuyer; John M. Haynes

2010-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Radar Nowcasting of Total Lightning over the Kennedy Space Center  

Science Conference Proceedings (OSTI)

A long-term radar dataset over Melbourne, Florida, was matched with three-dimensional lightning data to optimize radar-derived predictors of total lightning over the Kennedy Space Center (KSC). Four years (2006–09) of summer (June–August) daytime (...

Gregory N. Seroka; Richard E. Orville; Courtney Schumacher

2012-02-01T23:59:59.000Z

302

Subglacial water presence classification from polar radar data  

Science Conference Proceedings (OSTI)

Ground and airborne radar depth-sounding of the Greenland and Antarctic ice sheets have been used for many years to remotely determine characteristics such as ice thickness, subglacial topography, and mass balance of large bodies of ice. Ice coring efforts ... Keywords: Ensemble classification, Machine learning, Pattern recognition, Radar remote sensing, Subglacial water

Christopher M. Gifford; Arvin Agah

2012-06-01T23:59:59.000Z

303

A Description of the CSU–CHILL National Radar Facility  

Science Conference Proceedings (OSTI)

The subject of this paper is the Colorado State University–University of Chicago–Illinois State Water Survey (CSU–CHILL) National Radar Facility’s S-band polarimetric research radar. Key features of this system include polarization agility (...

David Brunkow; V. N. Bringi; Patrick C. Kennedy; Steven A. Rutledge; V. Chandrasekar; E. A. Mueller; Robert K. Bowie

2000-12-01T23:59:59.000Z

304

Climatology of Anomalous Propagation Radar Echoes in a Coastal Area  

Science Conference Proceedings (OSTI)

Anomalous propagation (AP) of ground-based radar beam results in the detection of ground echoes beyond the horizon. One year of data gathered with an S-band meteorological radar located on the coast in southwest France is used to analyze the ...

Frédéric Mesnard; Henri Sauvageot

2010-11-01T23:59:59.000Z

305

The Measurement of Precipitation with Synthetic Aperture Radar  

Science Conference Proceedings (OSTI)

The radar equation for the measurement of precipitation by SAR is identical to that for a conventional radar. The achievable synthetic beamwidth, ?s, is proportional to ?v/U, the ratio of the spread of the precipitation Doppler spectrum to the ...

David Atlas; Richard K. Moore

1987-09-01T23:59:59.000Z

306

High-Frequency Skywave Radar Track of Tropical Storm Debra  

Science Conference Proceedings (OSTI)

Tropical Storm Debra was tracked over a 31 h period in the Gulf of Mexico using the Wide Aperture Research Facility (WARF) high-frequency (HF) skywave radar in California. In contrast to the first WARF skywave radar tracking experiment in which ...

Joseph W. Maresca Jr.; Christopher T. Carlson

1981-04-01T23:59:59.000Z

307

A Robust Dual-Frequency Radar Profiling Algorithm  

Science Conference Proceedings (OSTI)

In this study, an algorithm to retrieve precipitation from spaceborne dual-frequency (13.8 and 35.6 GHz, or Ku/Ka band) radar observations is formulated and investigated. Such algorithms will be of paramount importance in deriving radar-based and ...

Mircea Grecu; Lin Tian; William S. Olson; Simone Tanelli

2011-07-01T23:59:59.000Z

308

Radio Acoustic Sounding with a UHF Volume Imaging Radar  

Science Conference Proceedings (OSTI)

An implementation of a radio acoustic sounding system (RASS) using a UHF volume imaging radar is presented. The volume-imaging ability of the radar permits the study the spatial structure of the RASS echo observing both the diffraction pattern on ...

Paco López Dekker; Stephen J. Frasier

2004-05-01T23:59:59.000Z

309

Ultrawideband radar clutter measurements of forested terrain, 1991--1992  

Science Conference Proceedings (OSTI)

The ultrawideband (UWB) radar clutter measurements project was conducted to provide radar clutter data for new ultrawideband radar systems which are currently under development. A particular goal of this project is to determine if conventional narrow band clutter data may be extrapolated to the UWB case. This report documents measurements conducted in 1991 and additional measurements conducted in 1992. The original project consisted of clutter measurements of forested terrain in the Olympic National Forest near Sequim, WA. The impulse radar system used a 30 kW peak impulse source with a 2 Gigasample/second digitizer to form a UHF (300--1000 MHz) ultrawideband impulse radar system. Additional measurements were conducted in parallel using a Systems Planning Corporation (SPC) step-chirp radar system. This system utilized pulse widths of 1330 nanoseconds over a bandwidth of 300--1000 MHz to obtain similar resolution to the impulse system. Due to the slow digitizer data throughput in the impulse radar system, data collection rates were significantly higher using the step-chirp system. Additional forest clutter measurements were undertaken in 1992 to increase the amount of data available, and especially to increase the amount of data from the impulse radar system.

Sheen, D.M.; Severtsen, R.H.; Prince, J.M.; Davis, K.C.; Collins, H.D.

1993-06-01T23:59:59.000Z

310

Radar-cross-section reduction of wind turbines. part 1.  

SciTech Connect

In recent years, increasing deployment of large wind-turbine farms has become an issue of growing concern for the radar community. The large radar cross section (RCS) presented by wind turbines interferes with radar operation, and the Doppler shift caused by blade rotation causes problems identifying and tracking moving targets. Each new wind-turbine farm installation must be carefully evaluated for potential disruption of radar operation for air defense, air traffic control, weather sensing, and other applications. Several approaches currently exist to minimize conflict between wind-turbine farms and radar installations, including procedural adjustments, radar upgrades, and proper choice of low-impact wind-farm sites, but each has problems with limited effectiveness or prohibitive cost. An alternative approach, heretofore not technically feasible, is to reduce the RCS of wind turbines to the extent that they can be installed near existing radar installations. This report summarizes efforts to reduce wind-turbine RCS, with a particular emphasis on the blades. The report begins with a survey of the wind-turbine RCS-reduction literature to establish a baseline for comparison. The following topics are then addressed: electromagnetic model development and validation, novel material development, integration into wind-turbine fabrication processes, integrated-absorber design, and wind-turbine RCS modeling. Related topics of interest, including alternative mitigation techniques (procedural, at-the-radar, etc.), an introduction to RCS and electromagnetic scattering, and RCS-reduction modeling techniques, can be found in a previous report.

Brock, Billy C.; Loui, Hung; McDonald, Jacob J.; Paquette, Joshua A.; Calkins, David A.; Miller, William K.; Allen, Steven E.; Clem, Paul Gilbert; Patitz, Ward E.

2012-03-05T23:59:59.000Z

311

Manhattan Project: Order to Drop the Atomic Bomb  

Office of Scientific and Technical Information (OSTI)

ORDER TO DROP THE ATOMIC BOMB Handy to Spaatz, National Archives (July 25, 1945) Resources > Library The document below is the order to attack Japanese cities with atomic bombs. In it, the Acting Army Chief of Staff, Thomas Handy, orders Commanding General Carl Spaatz, Army Strategic Air Forces, to "deliver [the] first special bomb as soon as weather will permit . . . after about 3 August 1945." The target list: "Hiroshima, Kokura, Niigata, and Nagasaki." Further attacks were also authorized: "additional bombs will be delivered on the above targets as soon as made ready." Handy was the acting chief of staff because George Marshall was with President Harry S. Truman at the Potsdam Conference. The letter explicitly notes that this order was approved by Marshall and Secretary of War Henry Stimson. Truman, of course, provided the ultimate authorization for dropping the bomb.

312

Properties of tropical convection observed by ARM millimeter-radars  

NLE Websites -- All DOE Office Websites (Extended Search)

Properties of tropical convection observed by ARM millimeter-radars Properties of tropical convection observed by ARM millimeter-radars Haynes, John Colorado State University Stephens, Graeme Colorado State University Category: Cloud Properties The results of an analysis of tropical cloud systems observed from a variety of vertically pointing radar systems are described. In particular, observations taken during five years of operation of the ARM millimeter wavelength radar system (MMCR) at Manus Island in the Tropical West Pacific region are characterized into cloud classes according to the radar reflectivity structures of these cloud systems, associated rainfall, and surface radiative properties. These observations of cloud properties are composited with respect to various phases of the Madden Julian Oscillation, which is a dominant mode of variability at Manus Island. A method of better

313

Title: Radar-observed convective characteristics during TWP-ICE  

NLE Websites -- All DOE Office Websites (Extended Search)

Title: Radar-observed convective characteristics during TWP-ICE Title: Radar-observed convective characteristics during TWP-ICE Schumacher, Courtney Texas A&M University Houze, Robert University of Washington May, Peter Bureau or Meteorology Research Centre Frederick, Kaycee Cetrone, Jasmine Vallgren, Andreas Category: Field Campaigns This poster will describe the radar dataset obtained in the Tropical Warm Pool International Cloud Experiment (TWP-ICE), which is to take place 20 January - 14 February 2006 in the vicinity of Darwin, Australia. We will describe the convective systems observed during the project by two scanning C-band Doppler radars, one of which will provide dual-polarization measurements, and ARM's vertically pointing cloud radar and lidar installations. In addition, we will discuss the potential for combining

314

W-Band ARM Cloud Radar - Specifications and Design  

NLE Websites -- All DOE Office Websites (Extended Search)

W-Band ARM Cloud Radar - Specifications and Design W-Band ARM Cloud Radar - Specifications and Design K. B. Widener Pacific Northwest National Laboratory Richland, Washington J. B. Mead ProSensing, Inc. Amherst, Massachusetts Abstract The Atmospheric Radiation Measurement (ARM) Program and ProSensing, Inc. have teamed to develop and deploy the W-band ARM Cloud Radar (WACR) at the SGP central facility. The WACR will be co- located with the ARM millimeter wave cloud radar (MMCR) with planned operation to begin in early 2005. This radar will complement the measurements of the MMCR and will aid in filtering out insect contamination in the data. In this poster we present the design goals, expected performance characteristics, and the detailed design for the WACR. Introduction The MMCR has been operating at the Southern Great Plains (SGP) site since 1998. It has proven to be

315

Inversion of synthetic aperture radar interferograms for sources of  

Open Energy Info (EERE)

Inversion of synthetic aperture radar interferograms for sources of Inversion of synthetic aperture radar interferograms for sources of production-related subsidence at the Dixie Valley geothermal field Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Inversion of synthetic aperture radar interferograms for sources of production-related subsidence at the Dixie Valley geothermal field Authors Bill Foxall and D. W. Vasco Published Journal Journal of Volcanology and Geothermal Research, 2008 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Inversion of synthetic aperture radar interferograms for sources of production-related subsidence at the Dixie Valley geothermal field Citation Bill Foxall,D. W. Vasco. 2008. Inversion of synthetic aperture radar interferograms for sources of production-related subsidence at the Dixie

316

Synthetic Aperture Radar Movie Gallery -- Sandia National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

Synthetic Aperture Radar Movie Gallery Synthetic Aperture Radar Movie Gallery This gallery features movies of Sandia National Laboratories' synthetic aperture radar imagery of Albuquerque, New Mexico and Washington, DC. Sandia's Twin-Otter SAR produced these high-resolution stripmap images in real time. (Note: The movies below have been downsampled greatly to make them suitable for viewing on the world wide web. These movies are not recommended for modems of speeds less than 56 kbps due to their large file sizes.) Albuquerque, NM Area Movies Sandia National Laboratories' Twin-Otter SAR produced these Ku-Band 0.3 and 1.0 meter resolution images of Albuquerque, NM in real time. Synthetic aperture radar movie of west Gibson Blvd 0.3 meter airborne synthetic aperture radar movie from I-25 to Maxwell along Gibson Blvd. (Length: 30 seconds)

317

PATTERN: Advantages of High Resolution Weather Radar Networks [EVS Event]  

NLE Websites -- All DOE Office Websites (Extended Search)

PATTERN: Advantages of High Resolution Weather Radar Networks PATTERN: Advantages of High Resolution Weather Radar Networks September 30, 2013 Speaker: Dr. Katharina Lengfeld Meteorological Institute, University of Hamburg, Germany Date: Monday, September 30, 2013 Time: 11 am - 12 noon Location: Argonne National Laboratory TCS Building 240 Room 4301 Precipitation observations with radars operating in the X-band frequency range are essential for meeting present and future requirements for flood forecasting, water management, and other hydro-meteorological applications. Besides having higher resolution, these systems are cost-effective compared to S- or C-band radars because of smaller antenna size. Disadvantages of single X-band radars are the large influence of attenuation by liquid water and a relatively short range.

318

Sliding drops across alternating hydrophobic and hydrophilic stripes  

E-Print Network (OSTI)

We perform a joint numerical and experimental study to sistematically characterize the motion of drops sliding over a periodic array of alternating hydrophobic and hydrophilic stripes with large wettability contrast, and typical width of hundreds of $\\mu \\textrm{m}$. The fraction of the hydrophobic stripes has been varied from about 20% to 80%. The effects of the heterogeneous patterning can be described by a renormalized value of the critical Bond number, i.e. the critical dimensionless force needed to depin the drop before it starts to move. Close to the critical Bond number we observe a jerkily motion characterized by an evident stick-slip dynamics. As a result, dissipation is strongly localized in time, and the mean velocity of the drops can easily decrease by an order of magnitude compared to the sliding on homogeneous surface. Lattice Boltzmann (LB) numerical simulations are crucial for disclosing to what extent the sliding dynamics can be deduced from the computed balance of capillary, viscous and body forces at varying the Bond number, the surface composition and the liquid viscosity. Away from the critical Bond number, we characterize both experimentally and numerically the dissipation inside the droplet by studying the relation between the average velocity and the applied volume forces.

M. Sbragaglia; L. Biferale; G. Amati; S. Varagnolo; D. Ferraro; G. Mistura; M. Pierno

2013-10-16T23:59:59.000Z

319

The effect of longitudinal spacer ribs on the minimum pressure drop in a heated annulus  

SciTech Connect

When evaluating a heated flow passage for vulnerability to static flow excursions, special note should be taken of flow restrictions which might allow premature vapor generation. In this study, measurements of steady state pressure drop were made for the downward flow of water in a vertical annulus. The outer wall was uniformly heated to allow subcooled boiling. Minima in the pressure drop characteristics were compared for test sections with and without longitudinal spacer ribs. For a given power and inlet temperature, the minimum occurred at a higher flow rate in the ribbed test section. This is attributed to vapor generation at the ribs. The work cited in this document show how a restriction in a heated channel can produce vapor which would not be observed in the absence of the restriction. In the present study, the effect of a flow restriction on the tendency to flow excursion is explored by finding demand curves for a heated annulus in subcooled boiling flow. The annulus is heated from the outside, and alternately equipped with and without longitudinal spacer ribs. These ribs separate the heated and unheated walls; in pressing against the heated wall they provide a means for premature vapor production.

Johnston, B.S.; Neff, J.M.

1990-01-01T23:59:59.000Z

320

Synthetic aperture radar processing with tiered subapertures  

SciTech Connect

Synthetic Aperture Radar (SAR) is used to form images that are maps of radar reflectivity of some scene of interest, from range soundings taken over some spatial aperture. Additionally, the range soundings are typically synthesized from a sampled frequency aperture. Efficient processing of the collected data necessitates using efficient digital signal processing techniques such as vector multiplies and fast implementations of the Discrete Fourier Transform. Inherent in image formation algorithms that use these is a trade-off between the size of the scene that can be acceptably imaged, and the resolution with which the image can be made. These limits arise from migration errors and spatially variant phase errors, and different algorithms mitigate these to varying degrees. Two fairly successful algorithms for airborne SARs are Polar Format processing, and Overlapped Subaperture (OSA) processing. This report introduces and summarizes the analysis of generalized Tiered Subaperture (TSA) techniques that are a superset of both Polar Format processing and OSA processing. It is shown how tiers of subapertures in both azimuth and range can effectively mitigate both migration errors and spatially variant phase errors to allow virtually arbitrary scene sizes, even in a dynamic motion environment.

Doerry, A.W. [Sandia National Labs., Albuquerque, NM (United States). Synthetic Aperture Radar Dept.

1994-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Radar transponder apparatus and signal processing technique  

DOE Patents (OSTI)

An active, phase-coded, time-grating transponder and a synthetic-aperture radar (SAR) and signal processor means, in combination, allow the recognition and location of the transponder (tag) in the SAR image and allow communication of information messages from the transponder to the SAR. The SAR is an illuminating radar having special processing modifications in an image-formation processor to receive an echo from a remote transponder, after the transponder receives and retransmits the SAR illuminations, and to enhance tile transponder`s echo relative to surrounding ground clutter by recognizing special transponder modulations from phase-shifted from the transponder retransmissions. The remote radio-frequency tag also transmits information to the SAR through a single antenna that also serves to receive the SAR illuminations. Unique tag-modulation and SAR signal processing techniques, in combination, allow the detection and precise geographical location of the tag, through the reduction of interfering signals from ground clutter, and allow communication of environmental and status information from said tag to be communicated to said SAR.

Axline, R.M. Jr.; Sloan, G.R.; Spalding, R.E.

1994-12-31T23:59:59.000Z

322

Studies of Precipitation Processes in the Troposphere Using an FM-CW Radar  

Science Conference Proceedings (OSTI)

In the field of FM-CW tropospheric radar, new breakthroughs have become possible due to progress in FM-CW radar hardware, in FM-CW radar signal processing and in the availability of the Doppler polarimetric FM-CW radar DARR. DARR has a high ...

L. P. Ligthart; L. R. Nieuwkerk

1989-10-01T23:59:59.000Z

323

Growth Of Cloud Drops by Condensation: A Criticism of Currently Accepted Theory and a New Approach  

Science Conference Proceedings (OSTI)

The currently accepted theory of the growth of cloud drops by condensation employs an equation for the rate of increase of drop mass and an equation for the supersaturation. The latter equation gives the average supersaturation over a large ...

R. C. Srivastava

1989-04-01T23:59:59.000Z

324

Collisions between Small Precipitation Drops. Part I: Laboratory Measurements of Bounce, Coalescence, and Temporary Coalescence  

Science Conference Proceedings (OSTI)

Self-collection efficiencies were measured for isolated drop pairs failing at terminal velocity using orthogonal cameras to obtain the horizontal offset of the drops before collision and the collision outcome. Data were obtained on four different ...

Harry T. Ochs III; Kenneth V. Beard; Robert R. Czys; Neil F. Laird; Daniel E. Schaufelberger; Donna J. Holdridge

1995-06-01T23:59:59.000Z

325

The Impression to Drop Size Ratio for the Raindrop Foil Impactor  

Science Conference Proceedings (OSTI)

A general calibration equation has been developed for the raindrop foil impactor. From experimental data the impression to drop size ratio is related to a nondimensional impact parameter and to the drop diameter to groove spacing ratio. These ...

R. L. Hobbs

1981-03-01T23:59:59.000Z

326

Laboratory and In Situ Observation of Deposition Growth of Frozen Drops  

Science Conference Proceedings (OSTI)

The water vapor deposition growth of frozen drops with diameter greater than 100 ?m has been studied in a thermal diffusion chamber. For varying periods of time, it was found that frozen drops experience spherical growth. The characteristic time ...

Alexei V. Korolev; Matthew P. Bailey; John Hallett; George A. Isaac

2004-04-01T23:59:59.000Z

327

The Influence of Charge on the Coalescence of Water Drops in Free Fall  

Science Conference Proceedings (OSTI)

The influence of charge on coalescence was determined in the laboratory for isolated pairs of 340 and 190 ?m water drops failing freely at terminal velocity. A microcomputer-controlled apparatus was used to produce collisions. Drop charges were ...

Robert R. Czys; Harry T. Ochs III

1988-11-01T23:59:59.000Z

328

Effects of Relative Humidity on the Coalescence of Small Precipitation Drops in Free Fall  

Science Conference Proceedings (OSTI)

Observations of the effects of relative humidity on coalescence are limited to studies using supported drops or streams of drops, and the results are contradictory. In this paper, findings are presented on the effect of high and low relative ...

Harry T. Ochs III; Kenneth V. Beard; Neil F. Laird; Donna J. Holdridge; Daniel E. Schaufelberger

1995-11-01T23:59:59.000Z

329

A Wind Tunnel Investigation of Interactions between Supercooled Precipitation-Size Water Drops  

Science Conference Proceedings (OSTI)

Laboratory experiments were performed to investigate interactions between small (400–900 ?m) precipitation-size drops at temperatures colder than 0°C. The investigation was accomplished by creating a light shower of supercooled drizzle drops in a ...

Robert R. Czys; Jeffrey K. Lew

1999-09-01T23:59:59.000Z

330

A Wind Tunnel Study of Turbulence Effects on the Scavenging of Aerosol Particles by Water Drops  

Science Conference Proceedings (OSTI)

Laboratory experiments are described where the effects of turbulence on the impaction scavenging of aerosol particles by water drops were investigated. During the experiments the drops were freely suspended at their terminal velocities in the ...

O. Vohl; S. K. Mitra; K. Diehl; G. Huber; S. C. Wurzler; K-L. Kratz; H. R. Pruppacher

2001-10-01T23:59:59.000Z

331

Conditioning analysis of incomplete Cholesky factorizations with orthogonal dropping  

SciTech Connect

The analysis of preconditioners based on incomplete Cholesky factorization in which the neglected (dropped) components are orthogonal to the approximations being kept is presented. General estimate for the condition number of the preconditioned system is given which only depends on the accuracy of individual approximations. The estimate is further improved if, for instance, only the newly computed rows of the factor are modified during each approximation step. In this latter case it is further shown to be sharp. The analysis is illustrated with some existing factorizations in the context of discretized elliptic partial differential equations.

Napov, Artem

2012-03-16T23:59:59.000Z

332

Potential hydroelectric power Mora Canal Drop. Final report  

DOE Green Energy (OSTI)

The feasibility of installing a hydroelectric power plant on the Mora Canal Drop site in Idaho was studied. It was recommended that a 1900 kW unit be installed to generate 8,113,000 kWh per year. The project should cost approximately $1.8 million. The generating cost would be between 20.3 and 22.2 mills/kWh. A local utility has offered to buy all power produced at 26 mills/kWh. No adverse environment, safety, or socio-economic effects are foreseen. (LCL)

Willer, D.C.

1978-12-01T23:59:59.000Z

333

High speed shadowgraphy for the study of liquid drops  

E-Print Network (OSTI)

: Creating Panoramic and Object Images, Library of Congress, ISBN: 978-0-165-34223-8, p 38. Hutchings I M, Martin G D and Hoath S D, (2007) Journal of Imaging Science and Technology 51(5), 438-444. Jones A R, (1977) Progress in Energy and Combustion... High speed shadowgraphy for the study of liquid drops José Rafael Castrejón-Pita, Rafael Castrejón-García§, Ian Hutchings Department of Engineering, University of Cambridge, CB3 0FS, 17 Charles Babbage Road, Cambridge, United Kingdom...

Castrejon-Pita, J.R.; Castrejon-Garcia, R.; Hutchings, I.M.

2012-01-01T23:59:59.000Z

334

Heat transfer and pressure drop in hexagonal ducts with surface dimples  

SciTech Connect

Measurements of detailed Nusselt number (Nu) distributions and pressure drop coefficients (f) for four hexagonal ducts with smooth and dimpled walls are performed to comparatively examine the thermal performances of three sets of dimpled walls with concave-concave, convex-convex and concave-convex configurations at Reynolds numbers (Re) in the range of 900-30,000. A set of selected experimental data illustrates the influences of dimple configuration and Re on the detailed Nu distributions, the area-averaged Nu over developed flow region (Nu-bar) and the pressure drop coefficients. Relative enhancements of Nu and f from the smooth-walled references (Nu{sub {infinity}} and f{sub {infinity}}) along with the thermal performance factor ({eta}) defined as (Nu-bar/Nu{sub {infinity}})/(f/f{sub {infinity}}){sup 1/3} are examined. Nu-bar and f correlations are individually obtained for each tested hexagonal duct using Re as the controlling parameter. (author)

Chang, S.W. [Thermal Fluids Laboratory, National Kaohsiung Marine University, No. 142, Haijhuan Road, Nanzih District, Kaohsiung City 81143 (China); Chiang, K.F. [Thermal Dissipation Department, AVC International Company (China); Chou, T.C. [Department of Marine Engineering, National Kaohsiung Marine University (China)

2010-11-15T23:59:59.000Z

335

History of Operational Use of Weather Radar by U.S. Weather Services. Part II: Development of Operational Doppler Weather Radars  

Science Conference Proceedings (OSTI)

The second part of a history of the use of storm surveillance radars by operational military and civil weather services in the United States is presented. This part describes the genesis and evolution of two operational Doppler weather radars, ...

Roger C. Whiton; Paul L. Smith; Stuart G. Bigler; Kenneth E. Wilk; Albert C. Harbuck

1998-06-01T23:59:59.000Z

336

Comparison of Radar Reflectivity and Vertical Velocity Observed with a Scannable C-Band Radar and Two UHF Profilers in the Lower Troposphere  

Science Conference Proceedings (OSTI)

A C-band meteorological Doppler radar has been used to investigate the dynamic processes and the coherent organizations within a clear air atmospheric boundary layer (ABL). Depending on the atmospheric conditions, this moderate sensitive radar ...

M. Lothon; B. Campistron; S. Jacoby-Koaly; B. Bénech; F. Lohou; F. Girard-Ardhuin

2002-06-01T23:59:59.000Z

337

Drop Dynamics and Speciation in Isolation of Metals from Liquid Wastes by Reactive Scavenging  

SciTech Connect

Computational and experimental studies of the motion and dynamics of liquid drops in gas flows were conducted with relevance to reactive scavenging of metals from atomized liquid waste. Navier-Stoke's computations of deformable drops revealed a range of conditions from which prolate drops are expected, and showed how frajectiones of deformable drops undergoing deceleration can be computed. Experimental work focused on development of emission fluorescence, and scattering diagnostics. The instrument developed was used to image drop shapes, soot, and nonaxisymmetric departures from steady flow in a 22kw combustor

Arne J. Pearlstein; Alexander Scheeline

2002-08-30T23:59:59.000Z

338

Packet Drop Avoidance for High-speed network transmission protocol  

SciTech Connect

As network bandwidth continues to grow and longer paths are used to exchange large scientific data between storage systems and GRID computation, it has become increasingly obvious that there is a need to deploy a packet drop avoidance mechanism into network transmission protocols. Current end-to-end congestion avoidance mechanisms used in Transmission Control Protocol (TCP) have worked well on low bandwidth delay product networks, but with newer high-bandwidth delay networks they have shown to be inefficient and prone to unstable. This is largely due to increased network bandwidth coupled with changes in internet traffic patterns. These changes come from a variety of new network applications that are being developed to take advantage of the increased network bandwidth. This paper will examine the end-to-end congestion avoidance mechanism and perform a step-by-step analysis of its theory. In addition we will propose an alternative approach developed as part of a new network transmission protocol. Our alternative protocol uses a packet drop avoidance (PDA) mechanism built on top of the maximum burst size (MBS) theory combined with a real-time available bandwidth algorithm.

Jin, Guojun

2004-05-01T23:59:59.000Z

339

Modeling Of Surface Deformation From Satellite Radar Interferometry In The  

Open Energy Info (EERE)

Modeling Of Surface Deformation From Satellite Radar Interferometry In The Modeling Of Surface Deformation From Satellite Radar Interferometry In The Salton Sea Geothermal Field, California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: Modeling Of Surface Deformation From Satellite Radar Interferometry In The Salton Sea Geothermal Field, California Details Activities (1) Areas (1) Regions (0) Abstract: Surface deformation in the Salton Sea geothermal field is modeled using results from satellite radar interferometry, data from leveling surveys, and observations from the regional GPS network. The field is located in the Salton Trough, an active spreading center in southern California, which is traversed by the Brawley seismic zone. Deformation time series at thousands of points in the study area are obtained from a

340

Applications of Radar Interferometry to Detect Surface Deformation in  

Open Energy Info (EERE)

Applications of Radar Interferometry to Detect Surface Deformation in Applications of Radar Interferometry to Detect Surface Deformation in Geothermal Areas of Imperial Valley in Southern California Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Applications of Radar Interferometry to Detect Surface Deformation in Geothermal Areas of Imperial Valley in Southern California Abstract InSAR (interferometric synthetic aperture radar) is applied in Imperial Valley of southern California to detect and characterize surface deformation in existing geothermal fields, possible future geothermal developments, and around faults. The data used are from the Envisat satellite, collected over the period 2003-2010. The specific InSAR technique applied, SqueeSARTM, identifies permanent and distributed scatterers (PS and DS), which play the role of numerous benchmarks

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

The “Owl Horn” Radar Signature in Developing Southern Plains Supercells  

Science Conference Proceedings (OSTI)

During spring 2001 in the Southern Plains, a recurring, hitherto undocumented reflectivity signature that the authors have called the “Owl Horn” signature (because the radar reflectivity pattern resembles the profile of the Great Horned Owl) was ...

Matthew R. Kramar; Howard B. Bluestein; Andrew L. Pazmany; John D. Tuttle

2005-09-01T23:59:59.000Z

342

Radar Observations and Simulation of the Melting Layer of Precipitation  

Science Conference Proceedings (OSTI)

The melting layer in precipitation is physically modeled and compared with high resolution Doppler radar data. The model includes a new formulation of the dielectric properties and can handle all ice particles with densities ranging from pure ...

Wim Klaassen

1988-12-01T23:59:59.000Z

343

Mesocyclone and Microburst Signature Distortion with Dual PRT Radars  

Science Conference Proceedings (OSTI)

A simple model is used to illustrate the limitations of dual pulse repetition time (PRT) radars for measurements of wind fields with strong horizontal wind gradients. In such conditions, errors may occur even if the radial velocity measurements ...

Peter T. May

2001-07-01T23:59:59.000Z

344

An Interactive System for Compositing Digital Radar and Satellite Data  

Science Conference Proceedings (OSTI)

This paper describes an approach for compositing digital radar data and GOES satellite data for meteorological analysis. The processing is performed on a user-oriented image processing system, and is designed to be used in the research mode. It ...

Gerald M. Heymsfield; Koushik K. Ghosh; Lily C. Chen

1983-05-01T23:59:59.000Z

345

Estimation of Cloud Content by W-Band Radar  

Science Conference Proceedings (OSTI)

W-band (3.2-mm) radars are seeing increasing utilization as a result of improving microwave technologies and the increased research emphasis being given to nonprecipitating clouds. This niche is exemplified by the study of the radiatively ...

Kenneth Sassen; Liang Liao

1996-06-01T23:59:59.000Z

346

Radar Observations of the Early Evolution of Bow Echoes  

Science Conference Proceedings (OSTI)

The evolution of 273 bow echoes that occurred over the United States from 1996 to 2002 was examined, especially with regard to the radar reflectivity characteristics during the prebowing stage. It was found that bow echoes develop from the ...

Brian A. Klimowski; Mark R. Hjelmfelt; Matthew J. Bunkers

2004-08-01T23:59:59.000Z

347

Prospects of the WSR-88D Radar for Cloud Studies  

Science Conference Proceedings (OSTI)

Sounding of nonprecipitating clouds with the 10-cm wavelength Weather Surveillance Radar-1988 Doppler (WSR-88D) is discussed. Readily available enhancements to signal processing and volume coverage patterns of the WSR-88D allow observations of a ...

Valery M. Melnikov; Dusan S. Zrni?; Richard J. Doviak; Phillip B. Chilson; David B. Mechem; Yefim L. Kogan

2011-04-01T23:59:59.000Z

348

Assessing Snowfall Rates from X-Band Radar Reflectivity Measurements  

Science Conference Proceedings (OSTI)

Realistic aggregate snowflake models and experimental snowflake size distribution parameters are used to derive X-band power-law relations between the equivalent radar reflectivity factor Ze and the liquid equivalent snowfall precipitation rate S ...

Sergey Y. Matrosov; Carroll Campbell; David Kingsmill; Ellen Sukovich

2009-11-01T23:59:59.000Z

349

Spatial Averaging of HF Radar Data for Wave Measurement Applications  

Science Conference Proceedings (OSTI)

HF radar data are often collected for time periods that are optimised for current measurement applications where, in many cases, very high temporal resolution is needed. Previous work has demonstrated that this does not provide sufficient ...

Lucy R. Wyatt; Jasmine B. D. Jaffrés; Mal L. Heron

350

Observations of Strong Surface Radar Ducts over the Persian Gulf  

Science Conference Proceedings (OSTI)

Ducting of microwave radiation is a common phenomenon over the oceans. The height and strength of the duct are controlling factors for radar propagation and must be determined accurately to assess propagation ranges. A surface evaporation duct ...

Ian M. Brooks; Andreas K. Goroch; David P. Rogers

1999-09-01T23:59:59.000Z

351

Objective Tropical Cyclone Center Tracking Using Single-Doppler Radar  

Science Conference Proceedings (OSTI)

This study presents an extension of the ground-based velocity track display (GBVTD)-simplex tropical cyclone (TC) circulation center–finding algorithm to further improve the accuracy and consistency of TC center estimates from single-Doppler radar ...

Michael M. Bell; Wen-Chau Lee

2012-05-01T23:59:59.000Z

352

Influence of Ground Clutter Contamination on Polarimetric Radar Parameters  

Science Conference Proceedings (OSTI)

The influence of ground clutter contamination on the estimation of polarimetric radar parameters, horizontal reflectivity (Zh), differential reflectivity (Zdr), correlation coefficient (?h?), and differential propagation phase (dp) was examined. ...

Katja Friedrich; Urs Germann; Pierre Tabary

2009-02-01T23:59:59.000Z

353

The Assimilation of Radar Data for Weather Prediction  

Science Conference Proceedings (OSTI)

Assimilation of radar data is one of the key scientific challenges for numerical weather prediction of convective systems. Considerable progress has been made in recent years including retrieval of boundary layer winds from single-Doppler ...

Juanzhen Sun; James W. Wilson

2003-08-01T23:59:59.000Z

354

TRMM Radar Observations of Shallow Precipitation over the Tropical Oceans  

Science Conference Proceedings (OSTI)

Observations from the precipitation radar aboard the Tropical Rainfall Measuring Mission satellite provide the first opportunity to map vertical structure properties of rain over the entire Tropics and subtropics. Storm height histograms reveal a ...

David A. Short; Kenji Nakamura

2000-12-01T23:59:59.000Z

355

A Microphysical Interpretation of Radar Reflectivity–Rain Rate Relationships  

Science Conference Proceedings (OSTI)

The microphysical aspects of the relationship between radar reflectivity Z and rainfall rate R are examined. Various concepts discussed in the literature are integrated into a coherent analytical framework and discussed with a focus on the ...

Matthias Steiner; James A. Smith; Remko Uijlenhoet

2004-05-01T23:59:59.000Z

356

A Rain-Rate Retrieval Algorithm for Attenuated Radar Measurements  

Science Conference Proceedings (OSTI)

A dynamic regularization scheme for rain-rate retrievals from attenuated radar measurements is presented. Most regularization techniques, including the optimal estimation method, use the state-space parameters to regularize the problem, which ...

Prabhat K. Koner; Alessandro Battaglia; Clemens Simmer

2010-03-01T23:59:59.000Z

357

The Spaced Antenna Technique for Radar Wind Profiling  

Science Conference Proceedings (OSTI)

The Doppler method for radar wind profiling of the troposphere and stratosphere has been the standard technique used for operational and most research applications of the instrumentation. An alternative approach for measuring winds, by making use ...

M. F. Larsen; J. Röttger

1989-12-01T23:59:59.000Z

358

Quality Control and Verification of Weather Radar Wind Profiles  

Science Conference Proceedings (OSTI)

Weather radar wind profiles (WRWPs) have been retrieved from Doppler volume scans using different implementations of the velocity–azimuth display (VAD) and volume velocity processing (VVP) methods. An extensive quality control of the radial ...

Iwan Holleman

2005-10-01T23:59:59.000Z

359

Cloud Model-Based Simulation of Spaceborne Radar Observations  

Science Conference Proceedings (OSTI)

Simulations of observations from potential spaceborne radars are made based on storm structure generated from the three-dimensional (3D) Goddard cumulus ensemble model simulation of an intense overland convective system. Five frequencies of 3, 10,...

H-Y. M. Yeh; N. Prasad; R. Meneghini; W-K. Tao; J. A. Jones; R. F. Adler

1995-01-01T23:59:59.000Z

360

Direct Observations of Coherent Backscatter of Radar Waves in Precipitation  

Science Conference Proceedings (OSTI)

In previous work, it was argued that a source of radar coherent scatter occurs in the direction perpendicular to the direction of wave propagation because of the presence of grids of enhanced particle concentrations with spatial periodicities in ...

A. R. Jameson; A. B. Kostinski

2010-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

The Atmospheric Radiation Measurement Program Cloud Radars: Operational Modes  

Science Conference Proceedings (OSTI)

During the past decade, the U.S. Department of Energy (DOE), through the Atmospheric Radiation Measurement (ARM) Program, has supported the development of several millimeter-wavelength radars for the study of clouds. This effort has culminated in ...

Eugene E. Clothiaux; Kenneth P. Moran; Brooks E. Martner; Thomas P. Ackerman; Gerald G. Mace; Taneil Uttal; James H. Mather; Kevin B. Widener; Mark A. Miller; Daniel J. Rodriguez

1999-07-01T23:59:59.000Z

362

A Butterfly Algorithm for Synthetic Aperture Radar Imaging  

E-Print Network (OSTI)

In spite of an extensive literature on fast algorithms for synthetic aperture radar (SAR) imaging, it is not currently known if it is possible to accurately form an image from N data points in provable near-linear time ...

Demanet, Laurent

363

Radar and Profiler Analysis of Colliding Boundaries: A Case Study  

Science Conference Proceedings (OSTI)

The kinematics of a head-on collision between two gust fronts, followed by a secondary collision between a third gust front and a bore generated by the initial collision, are described using analyses of Weather Surveillance Radar-1988 Doppler (...

Haldun Karan; Kevin Knupp

2009-07-01T23:59:59.000Z

364

Cloud Liquid Water and Ice Content Retrieval by Multiwavelength Radar  

Science Conference Proceedings (OSTI)

Cloud liquid water and ice content retrieval in precipitating clouds by the differential attenuation method using a dual-wavelength radar, as a function of the wavelength pair, is first discussed. In the presence of non-Rayleigh scatterers, ...

Nicolas Gaussiat; Henri Sauvageot; Anthony J. Illingworth

2003-09-01T23:59:59.000Z

365

Polarimetric Radar at Attenuated Wavelength as a Hydrological Sensor  

Science Conference Proceedings (OSTI)

A new method for the estimation of the rain rate using a polarimetric radar at attenuated wavelengths is proposed. At attenuated wavelengths, the differential reflectivity for horizontal and vertical polarization, ZDR, is the addition of a term ...

Henri Sauvageot

1996-06-01T23:59:59.000Z

366

The Clear-Air Coastal Vespertine Radar Bands  

Science Conference Proceedings (OSTI)

It is known that the insects observed in the lower layers of the atmosphere produce radar echos and that their spatiotemporal distribution is strongly influenced by the meteorological conditions and the thermodynamic structure of the atmosphere. ...

Henri Sauvageot; Gilbert Despaux

1996-04-01T23:59:59.000Z

367

The Effects of Rain on ERS-1 Radar Altimeter Data  

Science Conference Proceedings (OSTI)

An investigation into a potentially important, but little-studied effect on altimeter data—rain contamination—has been carried out using ERS-1. The method involves identifying large changes in the radar backscatter coefficient and relating these ...

Trevor H. Guymer; Graham D. Quartly; Meric A. Srokosz

1995-12-01T23:59:59.000Z

368

Ocean Wave Slope Observations Using Radar Backscatter and Laser Altimeters  

Science Conference Proceedings (OSTI)

Combination of laser and radar aboard an aircraft is used to directly measure long gravity wave surface tilting simultaneously with nadir-viewing microwave backscatter from the sea surface. The presented dataset is extensive, encompassing varied ...

D. Vandemark; B. Chapron; J. Sun; G. H. Crescenti; H. C. Graber

2004-12-01T23:59:59.000Z

369

Sensitivity Studies of the Models of Radar-Rainfall Uncertainties  

Science Conference Proceedings (OSTI)

It is well acknowledged that there are large uncertainties associated with the operational quantitative precipitation estimates produced by the U.S. national network of the Weather Surveillance Radar-1988 Doppler (WSR-88D). These errors result ...

Gabriele Villarini; Witold F. Krajewski

2010-02-01T23:59:59.000Z

370

Stratocumulus Liquid Water Content from Dual-Wavelength Radar  

Science Conference Proceedings (OSTI)

A technique is described to retrieve stratocumulus liquid water content (LWC) using the differential attenuation measured by vertically pointing radars at 35 and 94 GHz. Millimeter-wave attenuation is proportional to LWC and increases with ...

Robin J. Hogan; Nicolas Gaussiat; Anthony J. Illingworth

2005-08-01T23:59:59.000Z

371

On Deriving Vertical Air Motions from Cloud Radar Doppler Spectra  

Science Conference Proceedings (OSTI)

A method for deriving vertical air motions from cloud radar Doppler spectrum measurements is introduced. The method is applicable to cloud volumes containing small particles, in this case liquid droplets, which are assumed to trace vertical air ...

Matthew D. Shupe; Pavlos Kollias; Michael Poellot; Edwin Eloranta

2008-04-01T23:59:59.000Z

372

Two Examples of Operational Tornado Warnings Using Doppler Radar Data  

Science Conference Proceedings (OSTI)

The National Weather Service Forecast Office in Denver, Colorado; has access to a variety of new observational datasets via an advanced, interactive workstation. This paper describes the impact of one of these datasets—Doppler radar—on the real-...

Lawrence B. Dunn

1990-02-01T23:59:59.000Z

373

Using Radar Wind Observations to Improve Mesoscale Numerical Weather Prediction  

Science Conference Proceedings (OSTI)

A high-resolution radar data assimilation system is presented for high-resolution numerical weather prediction models. The system is under development at the Naval Research Laboratory for the Navy’s Coupled Ocean–Atmosphere Mesoscale Prediction ...

Qingyun Zhao; John Cook; Qin Xu; Paul R. Harasti

2006-08-01T23:59:59.000Z

374

Advanced Weather Radar Systems in Europe: The COST 75 Action  

Science Conference Proceedings (OSTI)

The European Union COST (Cooperation in Science and Technology) action on advanced weather radar systems is described. The associated five-year research project, which began in early 1993, has the objective to develop guideline specifications for ...

P. Meischner; C. Collier; A. Illingworth; J. Joss; W. Randeu

1997-07-01T23:59:59.000Z

375

Use of Dual-Wavelength Radar for Snow Parameter Estimates  

Science Conference Proceedings (OSTI)

Use of dual-wavelength radar, with properly chosen wavelengths, will significantly lessen the ambiguities in the retrieval of microphysical properties of hydrometeors. In this paper, a dual-wavelength algorithm is described to estimate the ...

Liang Liao; Robert Meneghini; Toshio Iguchi; Andrew Detwiler

2005-10-01T23:59:59.000Z

376

Radar Reflectivity–Based Estimates of Mixed Layer Depth  

Science Conference Proceedings (OSTI)

This study investigates the potential for estimating mixed layer depth by taking advantage of the radial gradients in the radar reflectivity field produced by the large vertical gradients in water vapor mixing ratio that are characteristic of the ...

P. L. Heinselman; P. L. Spencer; K. L. Elmore; D. J. Stensrud; R. M. Hluchan; P. C. Burke

2009-02-01T23:59:59.000Z

377

An Evaluation of Radar Rainfall Estimates from Specific Differential Phase  

Science Conference Proceedings (OSTI)

Specific differential propagation phase (KDP) is examined for estimating convective rainfall in Colorado and Kansas. Estimates are made at S band with KDP alone and in combination with radar reflectivity (ZH). Results are compared to gauge ...

Edward A. Brandes; Alexander V. Ryzhkov; Dus?an S. Zrni?

2001-03-01T23:59:59.000Z

378

Radar Signatures of Tropical Cyclone Tornadoes in Central North Carolina  

Science Conference Proceedings (OSTI)

During the tropical cyclone season of 2004, there were four tropical cyclones that spawned tornadoes in central North Carolina: Frances, Gaston, Ivan, and Jeanne. This study examines the environmental characteristics and radar signatures from ...

Douglas Schneider; Scott Sharp

2007-04-01T23:59:59.000Z

379

Radar Wind Profiler Radial Velocity: A Comparison with Doppler Lidar  

Science Conference Proceedings (OSTI)

The accuracy of the radial wind velocity measured with a radar wind profiler will depend on turbulent variability and instrumental noise. Radial velocity estimates of a boundary layer wind profiler are compared with those estimated by a Doppler ...

Stephen A. Cohn; R. Kent Goodrich

2002-12-01T23:59:59.000Z

380

Signal Processing System for the CASA Integrated Project I Radars  

Science Conference Proceedings (OSTI)

This paper describes the waveform design space and signal processing system for dual-polarization Doppler weather radar operating at X band. The performance of the waveforms is presented with ground clutter suppression capability and mitigation ...

Nitin Bharadwaj; V. Chandrasekar; Francesc Junyent

2010-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Assessment of Vertically Integrated Liquid (VIL) Water Content Radar Measurement  

Science Conference Proceedings (OSTI)

Vertically integrated liquid (VIL) water content is a parameter obtained from a radar performing voluminal scanning. This parameter has proven useful in the detection of severe storms and may be a worthwhile indicator for very short-term rainfall ...

Brice Boudevillain; Hervé Andrieu

2003-06-01T23:59:59.000Z

382

Raindrop Size Distributions and the Radar Bright Band  

Science Conference Proceedings (OSTI)

The relationship between raindrop size distribution, measured with a disdrometer, and a radar parameter of the melting-layer bright band is investigated. The data, obtained in July 1993 in Switzerland, cover 120 h of precipitation. A good ...

A. Huggel; W. Schmid; A. Waldvogel

1996-10-01T23:59:59.000Z

383

Dealiasing of Doppler Radar Velocities Using a Torus Mapping  

Science Conference Proceedings (OSTI)

A novel dealiasing algorithm for Doppler radar velocity data has been developed at the Swedish Meteorological and Hydrological Institute (SMHI). Unlike most other methods, it does not need independent wind information from other instruments (e.g.,...

Günther Haase; Tomas Landelius

2004-10-01T23:59:59.000Z

384

An Automated Radar Technique for the Identification of Tropical Precipitation  

Science Conference Proceedings (OSTI)

A radar-based automated technique for the identification of tropical precipitation was developed to improve quantitative precipitation estimation during extreme rainfall events. The technique uses vertical profiles of reflectivity to identify the ...

Xiaoyong Xu; Kenneth Howard; Jian Zhang

2008-10-01T23:59:59.000Z

385

Finescale Radar Observations of Tornado and Mesocyclone Structures  

Science Conference Proceedings (OSTI)

A variety of vortex configurations observed at finescale with Doppler On Wheels (DOW) radars in and near the hook echoes of supercell thunderstorms are described. These include marginal/weak tornadoes, often with no documented condensation funnels,...

Joshua Wurman; Karen Kosiba

2013-10-01T23:59:59.000Z

386

Use of Ground Clutter to Monitor Polarimetric Radar Calibration  

Science Conference Proceedings (OSTI)

It is suggested that urban ground clutter can have a role in monitoring calibration of reflectivity factor ZH and differential reflectivity ZDR on polarimetric radars. The median and average values of these variables are considered. Analysis of ...

L. Borowska; D. Zrnic

2012-02-01T23:59:59.000Z

387

Impacts of Polarimetric Radar Observations on Hydrologic Simulation  

Science Conference Proceedings (OSTI)

Rainfall estimated from the polarimetric prototype of the Weather Surveillance Radar-1988 Doppler [WSR-88D (KOUN)] was evaluated using a dense Micronet rain gauge network for nine events on the Ft. Cobb research watershed in Oklahoma. The ...

Jonathan J. Gourley; Scott E. Giangrande; Yang Hong; Zachary L. Flamig; Terry Schuur; Jasper A. Vrugt

2010-06-01T23:59:59.000Z

388

CloudSat as a Global Radar Calibrator  

Science Conference Proceedings (OSTI)

The calibration of the CloudSat spaceborne cloud radar has been thoroughly assessed using very accurate internal link budgets before launch, comparisons with predicted ocean surface backscatter at 94 GHz, direct comparisons with airborne cloud ...

A. Protat; D. Bouniol; E. J. O’Connor; H. Klein Baltink; J. Verlinde; K. Widener

2011-03-01T23:59:59.000Z

389

Upscale Evolution of MCSs: Doppler Radar Analysis and Analytical Investigation  

Science Conference Proceedings (OSTI)

The development of two small mesoscale convective systems (MCSs) in northeastern Colorado is investigated via dual-Doppler radar analysis. The first system developed from several initially isolated cumulonimbi, which gradually coalesced into a ...

Ray L. McAnelly; Jason E. Nachamkin; William R. Cotton; Melville E. Nicholls

1997-06-01T23:59:59.000Z

390

Remote Sensing of Hail with a Dual Linear Polarization Radar  

Science Conference Proceedings (OSTI)

A technique for the remote sensing of hail with an S-band dual linear polarization radar is described. The method employs a new hail signal HDR, which is derived from disdrometer measurements of raindrop size distributions. Experimental ...

K. Aydin; T. A. Seliga; V. Balaji

1986-10-01T23:59:59.000Z

391

VHF Doppler Radar Observations of Buoyancy Waves Associated with Thunderstorms  

Science Conference Proceedings (OSTI)

The Platteville VHF Doppler radar, located on the Colorado piedmont near Platteville, Colorado, continuously measured the vertical wind velocity during a 12-day period in late July and early August 1981. Measurements were made every 2.5 min on ...

Daren Lu; T. E. VanZandt; W. L. Clark

1984-01-01T23:59:59.000Z

392

Operational Weather Radar in the United States: Progress and Opportunity  

Science Conference Proceedings (OSTI)

The NEXRAD operational system consisting of a network of WSR—88D radars is now operational within the 50 states, as well as Puerto Rico and Guam. This technology has been enthusiastically received by weather forecasters in all regions and ...

Robert J. Serafin; James W. Wilson

2000-03-01T23:59:59.000Z

393

Automatic Detection of Wind Turbine Clutter for Weather Radars  

Science Conference Proceedings (OSTI)

Wind turbines cause contamination of weather radar signals that is often detrimental and difficult to distinguish from cloud returns. Because the turbines are always at the same location, it would seem simple to identify where wind turbine ...

Kenta Hood; Sebastián Torres; Robert Palmer

2010-11-01T23:59:59.000Z

394

Antenna Pattern Analysis and Measurements for Multiparameter Radars  

Science Conference Proceedings (OSTI)

Measuring the full polarization matrix using a research radar requires knowledge of the complex (i.e., amplitude and phase) antenna pattern to properly correct for bias errors in the measurements. However, generally only power patterns are ...

V. Chandrasekar; R. Jeffrey Keeler

1993-10-01T23:59:59.000Z

395

Operational Monitoring of Weather Radar Receiving Chain Using the Sun  

Science Conference Proceedings (OSTI)

A method for operational monitoring of a weather radar receiving chain, including the antenna gain and the receiver, is presented. The “online” method is entirely based on the analysis of sun signals in the polar volume data produced during ...

Iwan Holleman; Asko Huuskonen; Mikko Kurri; Hans Beekhuis

2010-01-01T23:59:59.000Z

396

Measurement of Mean Raindrop Shape from Polarimetric Radar Observations  

Science Conference Proceedings (OSTI)

Interpretation of polarimetric radar measurements in rainfall such as differential reflectivity and specific differential phase shifts depends on the mean raindrop shape–size relationship. Currently, semiempirical relations between the oblateness ...

Eugenio Gorgucci; Gianfranco Scarchilli; V. Chandrasekar; V. N. Bringi

2000-10-01T23:59:59.000Z

397

Polarization Radar Estimates of Raindrop Size Spectra and Rainfall Rates  

Science Conference Proceedings (OSTI)

The differential reflectivity (ZDR) measures the mean shape of hydrometeors and provides an estimate of the mean size of raindrops Observations of ZDR for rain may be combined with the conventional radar reflectivity factor (Z) and fitted to any ...

A. J. Illingworth; I. J. Caylor

1989-12-01T23:59:59.000Z

398

Partially Coherent Backscatter in Radar Observations of Precipitation  

Science Conference Proceedings (OSTI)

Classical radar theory only considers incoherent backscatter from precipitation. Can precipitation generate coherent scatter as well? Until now, the accepted answer has been no, because hydrometeors are distributed sparsely in space (relative to ...

A. R. Jameson; A. B. Kostinski

2010-06-01T23:59:59.000Z

399

Processing and Interpretation of Coherent Dual-Polarized Radar Measurements  

Science Conference Proceedings (OSTI)

Dual-polarized coherent radar measurements are used to estimate the differential propagation phase or DP between horizontal and vertical polarization states. The slope of DP is an estimate of the specific differential phase KDP. This process is ...

J. Hubbert; V. Chandrasekar; V. N. Bringi; P. Meischner

1993-04-01T23:59:59.000Z

400

Cloud Ice Crystal Classification Using a 95-GHz Polarimetric Radar  

Science Conference Proceedings (OSTI)

Two algorithms are presented for ice crystal classification using 95-GHz polarimetric radar observables and air temperature (T). Both are based on a fuzzy logic scheme. Ice crystals are classified as columnar crystals (CC), planar crystals (PC), ...

K. Aydin; J. Singh

2004-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

The Window Probability Matching Method for Rainfall Measurements with Radar  

Science Conference Proceedings (OSTI)

A simplified probability matching method is introduced that relies on matching the unconditional probabilities of R and Ze, using data from a C-band radar and raingage network near Darwin, Australia. This is achieved by matching raingage ...

Daniel Rosenfeld; David B. Wolff; Eyal Amitai

1994-06-01T23:59:59.000Z

402

Enclosing Shapes for Single-Doppler Radar Features  

Science Conference Proceedings (OSTI)

The primary function of the Terminal Doppler Weather Radar (TDWR) system is to issue microburst alerts when a microburst hazard endangers aircraft. The steps of the algorithm process include 1) determining that a microburst hazard is present, and ...

F. W. Wilson Jr.; R. K. Goodrich; K. Brislawn

1992-04-01T23:59:59.000Z

403

Least Squares Reconstruction of Doppler Radar Spectra for Irregular PRT  

Science Conference Proceedings (OSTI)

A least squares method for the reconstruction of Doppler spectra of weather radars with irregular pulse repetition time used to increase the range of unambiguous velocity is presented and evaluated. This method is a robust spectral method that is ...

John Kalogiros

2012-12-01T23:59:59.000Z

404

A Model for Probability Nowcasts of Accumulated Precipitation Using Radar  

Science Conference Proceedings (OSTI)

A new model for making probability forecasts of accumulated spot precipitation from weather radar data is presented. The model selects a source region upwind of the forecast spot. All pixels (horizontal size 2 × 2 km2) within the source region ...

Tage Andersson; Karl-Ivar Ivarsson

1991-01-01T23:59:59.000Z

405

Measurement of Raindrop Size Distributions Using a Small Doppler Radar  

Science Conference Proceedings (OSTI)

A small X-band bistatic Doppler radar originally developed for use in automated weather stations as a Precipitation Occurrence Sensor System (POSS) can also measure real time raindrop size distributions. In contrast to large-scale pulsed Doppler ...

Brian E. Sheppard

1990-04-01T23:59:59.000Z

406

A Radar and Electrical Study of Tropical “Hot Towers”  

Science Conference Proceedings (OSTI)

Radar and electrical measurements for deep tropical convection are examined for both “break period” and “monsoonal” regimes in the vicinity of Darwin, Australia. Break period convection consists primarily of deep continental convection, whereas ...

E. R. Williams; S. G. Geotis; N. Renno; S. A. Rutledge; E. Rasmussen; T. Rickenbach

1992-08-01T23:59:59.000Z

407

Earth curvature and atmospheric refraction effects on radar signal propagation.  

SciTech Connect

The earth isn't flat, and radar beams don't travel straight. This becomes more noticeable as range increases, particularly at shallow depression/grazing angles. This report explores models for characterizing this behavior.

Doerry, Armin Walter

2013-01-01T23:59:59.000Z

408

A Proposed Technique for Diagnosis by Radar of Hurricane Structure  

Science Conference Proceedings (OSTI)

A Doppler radar technique is proposed for remote estimation of hurricane structure by sampling the kinematic properties of the hurricane wind field in a relatively small circular area outside the radius of maximum winds. This technique uses ...

Ralph J. Donaldson Jr.

1991-12-01T23:59:59.000Z

409

A Radar Simulator for High-Resolution Nonhydrostatic Models  

Science Conference Proceedings (OSTI)

A full radar simulator for high-resolution (1–5 km) nonhydrostatic models has been developed within the research nonhydrostatic mesoscale atmospheric (Meso-NH) model. This simulator is made up of building blocks, each of which describes a ...

Olivier Caumont; Véronique Ducrocq; Guy Delrieu; Marielle Gosset; Jean-Pierre Pinty; Jacques Parent du Châtelet; Hervé Andrieu; Yvon Lemaître; Georges Scialom

2006-08-01T23:59:59.000Z

410

Statistical Quality of Spectral Polarimetric Variables for Weather Radar  

Science Conference Proceedings (OSTI)

Spectral polarimetry for weather radar capitalizes on both Doppler and polarimetric measurements to reveal polarimetric variables as a function of radial velocity through spectral analysis. For example, spectral differential reflectivity at a ...

Tian-You Yu; Xiao Xiao; Yadong Wang

2012-09-01T23:59:59.000Z

411

Raindrop Size Distribution and Radar Parameters at Cape Verde  

Science Conference Proceedings (OSTI)

Precipitation measurement using passive or active microwaves from space- or ground-based radar involves hypotheses about the raindrop size distribution (DSD). A universal knowledge of DSD characteristics is needed. A 4-yr dataset collected with a ...

Armand Nzeukou; Henri Sauvageot; Abe Delfin Ochou; Cheikh Mouhamed Fadel Kebe

2004-01-01T23:59:59.000Z

412

Agile-Beam Phased Array Radar for Weather Observations  

Science Conference Proceedings (OSTI)

Weather radars with conventional antenna cannot provide desired volume scan updates at intervals of one minute or less, which is essential for significant improvement in warning lead time of impending storm hazards. The agile-beam multimission ...

D. S. Zrnic; J. F. Kimpel; D. E. Forsyth; A. Shapiro; G. Crain; R. Ferek; J. Heimmer; W. Benner; T. J. McNellis; R. J. Vogt

2007-11-01T23:59:59.000Z

413

Guard Rail Detection Using Radar and Vision Data Fusion  

E-Print Network (OSTI)

This paper describes a method for detecting guard rails fusing radar and vision data in order to improve and speed-up vehicle detection algorithms. The method is based on the search for uninterrupted oblique lines that cross an interest area. The interest area is dinamically indicated by a radar sensor. A method to manage overlapping areas is also described. The method's efficiency, both in terms of time saving and correct detection rate, is numerically shown.

For Vehicle Detection; Alberto Broggi; Pietro Cerri; Fabio Oleari; Marco Paterlini

2005-01-01T23:59:59.000Z

414

Do We Observe Aerosol Impacts on DSDs in Strongly Forced Tropical Thunderstorms?  

Science Conference Proceedings (OSTI)

Rain drop size distributions retrieved from polarimetric radar measurements over regularly occurring thunderstorms over the islands north of Darwin, Australia, are used to test if aerosol contributions to the probability distributions of the drop ...

P. T. May; V. N. Bringi; M. Thurai

2011-09-01T23:59:59.000Z

415

Total number of longwall faces drops below 50  

Science Conference Proceedings (OSTI)

For the first time since Coal Age began its annual Longwall Census the number of faces has dropped below 50. A total of five mines operate two longwall faces. CONSOL Energy remains the leader with 12 faces. Arch Coal operates five longwall mines; Robert E. Murray owns five longwall mines. West Virginia has 13 longwalls, followed by Pennsylvania (8), Utah (6) and Alabama (6). A detailed table gives for each longwall installation, the ownership, seam height, cutting height, panel width and length, overburden, number of gate entries, depth of cut, model of equipment used (shearer, haulage system, roof support, face conveyor, stage loader, crusher, electrical controls and voltage to face). 2 tabs., 1 photo.

Fiscor, S.

2009-02-15T23:59:59.000Z

416

ASSIMILATION OF DOPPLER RADAR DATA INTO NUMERICAL WEATHER MODELS  

Science Conference Proceedings (OSTI)

During the year 2008, the United States National Weather Service (NWS) completed an eight fold increase in sampling capability for weather radars to 250 m resolution. This increase is expected to improve warning lead times by detecting small scale features sooner with increased reliability; however, current NWS operational model domains utilize grid spacing an order of magnitude larger than the radar data resolution, and therefore the added resolution of radar data is not fully exploited. The assimilation of radar reflectivity and velocity data into high resolution numerical weather model forecasts where grid spacing is comparable to the radar data resolution was investigated under a Laboratory Directed Research and Development (LDRD) 'quick hit' grant to determine the impact of improved data resolution on model predictions with specific initial proof of concept application to daily Savannah River Site operations and emergency response. Development of software to process NWS radar reflectivity and radial velocity data was undertaken for assimilation of observations into numerical models. Data values within the radar data volume undergo automated quality control (QC) analysis routines developed in support of this project to eliminate empty/missing data points, decrease anomalous propagation values, and determine error thresholds by utilizing the calculated variances among data values. The Weather Research and Forecasting model (WRF) three dimensional variational data assimilation package (WRF-3DVAR) was used to incorporate the QC'ed radar data into input and boundary conditions. The lack of observational data in the vicinity of SRS available to NWS operational models signifies an important data void where radar observations can provide significant input. These observations greatly enhance the knowledge of storm structures and the environmental conditions which influence their development. As the increase in computational power and availability has made higher resolution real-time model simulations possible, the need to obtain observations to both initialize numerical models and verify their output has become increasingly important. The assimilation of high resolution radar observations therefore provides a vital component in the development and utility of numerical model forecasts for both weather forecasting and contaminant transport, including future opportunities to improve wet deposition computations explicitly.

Chiswell, S.; Buckley, R.

2009-01-15T23:59:59.000Z

417

Constructing Three-Dimensional Multiple-Radar Reflectivity Mosaics: Examples of Convective Storms and Stratiform Rain Echoes  

Science Conference Proceedings (OSTI)

The advent of Internet-2 and effective data compression techniques facilitates the economic transmission of base-level radar data from the Weather Surveillance Radar-1988 Doppler (WSR-88D) network to users in real time. The native radar spherical ...

Jian Zhang; Kenneth Howard; J. J. Gourley

2005-01-01T23:59:59.000Z

418

Impact of CASA Radar and Oklahoma Mesonet Data Assimilation on the Analysis and Prediction of Tornadic Mesovortices in an MCS  

Science Conference Proceedings (OSTI)

The impact of radar and Oklahoma Mesonet data assimilation on the prediction of mesovortices in a tornadic mesoscale convective system (MCS) is examined. The radar data come from the operational Weather Surveillance Radar-1988 Doppler (WSR-88D) ...

Alexander D. Schenkman; Ming Xue; Alan Shapiro; Keith Brewster; Jidong Gao

2011-11-01T23:59:59.000Z

419

An Innovative Transponder-Based Interferometric Radar for Vibration Measurements  

SciTech Connect

Ground-based radar interferometry has recently emerged as an innovative technology of remote sensing, able to accurately measure the static or dynamic displacement of several points of a structure. This technique in the last couple of years has been applied to different types of structures, such as bridges, towers and chimneys. This paper presents a prototype system developed by IDS, originally aimed at measuring the structural vibrations of helicopter rotor blades, based on an interferometric technique and constituted by combination of a radar sensor and a series of transponders installed on the target structure. The main advantages of this solution with respect to conventional interferometric radars, are related to the increased spatial resolution of the system, provided by the possibility to discriminate different transponders installed within the same resolution cell of the radar sensor, and to the reduction of the ambient noise (e.g. multi-path) on the radar measurement. The first feature allows the use of the microwave technology even on target areas with limited dimensions, such as industrial facilities, while the second aspect may extend the use of radar interferometric systems to complex scenarios, where multi-reflections are expected due to the presence of natural targets with high reflectivity to the radar signal. In the paper, the system and its major characteristics are first described; subsequently, application to the measurement of ambient vibration response of a lab set-up is summarized. Then the data acquired on a rotating mock-up are reported and analyzed to identify natural frequencies and mode shapes of the investigated structure.

Coppi, F.; Cerutti, A.; Farina, P.; De Pasquale, G.; Novembrini, G. [IDS Ingegneria dei Sistemi S.p.A., Via Livornese 1019, Pisa (Italy)

2010-05-28T23:59:59.000Z

420

Three-dimensional subsurface imaging synthetic aperture radar (3D SISAR). Final report, September 22, 1993--September 22, 1996  

SciTech Connect

The concept developed under this applied research and development contract is a novel Ground Penetrating Radar system capable of remotely detecting, analyzing, and mapping buried waste containers from a mobile platform. From the testing and analysis performed to date, the 3-D SISAR has achieved the detection, accurate location, and three-dimensional imaging of buried test objects from a stand-off geometry. Tests have demonstrated that underground objects have been located to within 0.1 meter of their actual position. This work validates that the key elements of the approach are performing as anticipated. The stand-off synthetic aperture radar (SAR) methodology has been demonstrated to be a feasible approach as a remote sensing technique. The radar sensor constructed under this project is providing adequate quality data for imaging, and the matched filters have been demonstrated to provide enhanced target detection. Additional work is on-going in the area of underground propagation and scattering phenomena to provide enhanced depth performance, as the current imaging results have been limited to a few feet of depth underground.

NONE

1998-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Heat transfer and pressure drop measurements in an air/molten salt direct-contact heat exchanger  

SciTech Connect

This paper presents a comparison of experimental data with a recently published model of heat exchange in irrigated packed beds. Heat transfer and pressure drop were measured in a 150 mm (ID) column with a 610-mm bed of metal Pall rings. Molten nitrate salt and preheated air were the working fluids with a salt inlet temperature of approximately 440{degree}C and air inlet temperatures of approximately 230{degree}C. A comparison between the experimental data and the heat transfer model is made on the basis of heat transfer from the salt. For the range of air and salt flow rates tested, 0.3 to 1.2 kg/m{sup 2} s air flow and 6 to 18 kg/m{sup 2} s salt flow, the data agree with the model within 22% standard deviation. In addition, a model for the column pressure drop was validated, agreeing with the experimental data within 18% standard deviation over the range of column pressure drop from 40 to 1250 Pa/m. 25 refs., 7 figs., 2 tabs.

Bohn, M.S.

1988-11-01T23:59:59.000Z

422

Pressure drop of two-phase plug flow in round mini-channels: Influence of surface wettability  

SciTech Connect

In the present experimental study, the pressure drop of two-phase plug flows in round mini-channels was investigated for three different tube materials, i.e., glass, polyurethane and Teflon, respectively, with their inner diameters ranging from 1.62 to 2.16 mm. Air and water were used as the test fluids. In the wet-plug flow regime (wet wall condition at the gas portions), the pressure drop was reasonably predicted by the homogeneous flow model or by the correlations of Mishima and Hibiki [K. Mishima, T. Hibiki, Some characteristics of air-water two-phase flow in small diameter vertical tubes, Int. J. Multiphase Flow 22 (1996) 703-712] and Chisholm [D. Chisholm, A theoretical basis for the Lockhart-Martinelli correlation for two-phase flow, Int. J. Heat Mass Transfer 10 (1967) 1767-1778]. On the other hand, in the dry-plug flow regime (dry wall condition at the gas portions), the role of the moving contact lines turned out to be significant. To take into account the effect of the moving contact lines, a modified Lockhart-Martinelli type correlation was proposed, which fitted the measured pressure-drop data within the mean deviation of 6%. (author)

Lee, Chi Young; Lee, Sang Yong [Department of Mechanical Engineering, KAIST, Science Town, Daejeon 305-701 (Korea)

2008-09-15T23:59:59.000Z

423

Pressure drop of two-phase dry-plug flow in round mini-channels: Effect of moving contact line  

SciTech Connect

In the present experimental study, the pressure drop of the two-phase dry-plug flow (dry wall condition at the gas portions) in round mini-channels was investigated. The air-water mixtures were flowed through the round mini-channels made of polyurethane and Teflon, respectively, with their inner diameters ranging from 1.62 to 2.16 mm. In the dry-plug flow regime, the pressure drop measured became larger either by increasing the liquid superficial velocity or by decreasing the gas superficial velocity due to the increase of the number of the moving contact lines in the test section. In such a case, the role of the moving contact lines turned out to be significant. Therefore, a pressure drop model of dry-plug flow was proposed through modification of the dynamic contact angle analysis taking account of the energy dissipation by the moving contact lines, which represents the experimental data within the mean deviation of 4%. (author)

Lee, Chi Young; Lee, Sang Yong [Department of Mechanical Engineering, KAIST, Science Town, Daejeon 305-701 (Korea)

2010-01-15T23:59:59.000Z

424

Rainfall Estimation from Polarimetric Radar Measurements: Composite Algorithms Immune to Variability in Raindrop Shape–Size Relation  

Science Conference Proceedings (OSTI)

Polarization diversity radar measurements such as reflectivity factor, differential reflectivity, and differential propagation phase are extensively used in rainfall estimation. Algorithms to estimate rainfall from polarimetric radar measurements ...

Eugenio Gorgucci; Gianfranco Scarchilli; V. Chandrasekar; V. N. Bringi

2001-11-01T23:59:59.000Z

425

Drop-Size Distributions in Thunderstorms Measured by Optical Disdrometers during VORTEX2  

Science Conference Proceedings (OSTI)

When studying the influence of microphysics on the near-surface buoyancy tendency in convective thunderstorms, in situ measurements of microphysics near the surface are essential and those are currently not provided by most weather radars. In this ...

Katja Friedrich; Evan A. Kalina; Forrest J. Masters; Carlos R. Lopez

2013-04-01T23:59:59.000Z

426

A New Look into the Treatment of Small-Scale Drop Variability...  

NLE Websites -- All DOE Office Websites (Extended Search)

entropy and thus convey minimum information about drop distribution variation in space (Ash 1965). The use of such distributions in the radiative transfer equation, therefore,...

427

Orbits and reversals of a drop rolling inside a horizontal circular hydraulic jump  

E-Print Network (OSTI)

We explore the complex dynamics of a non-coalescing drop of moderate size inside a circular hydraulic jump of the same liquid formed on a horizontal disk. In this situation the drop is moving along the jump and one observes two different motions: a periodic one (it orbitates at constant speed) and an irregular one involving reversals of the orbital motion. Modeling the drop as a rigid sphere exchanging friction with liquid across a thin film of air, we recover the orbital motion and the internal rotation of the drop. This internal rotation is experimentally observed.

Alexis Duchesne; Clément Savaro; Luc Lebon; Christophe Pirat; Laurent Limat

2013-01-29T23:59:59.000Z

428

Anisotropic wetting and de-wetting of drops on substrates patterned with polygonal posts  

E-Print Network (OSTI)

We present results showing how water drops, produced by ink-jet printing, spread on surfaces patterned with lattices of diamond or triangular posts. Considering post widths typically ~7 m and lattice spacings between 15-40 m, we observe drop shapes with 3,4 and 6-fold symmetry, depending on both the symmetry of the lattice and the shape of the posts. This is a result of the different mechanisms of interface pinning and depinning which depend on the direction of the contact line motion with respect to the post shape. Lattice Boltzmann simulations are used to describe these mechanisms in detail for triangular posts. We also follow the motion of the contact line as the drops evaporate showing that they tend to return to their original shape. To explain this we show that the easy direction for movement is the same for spreading and drying drops. We compare the behaviour of small drops with that of larger drops created by jetting several drops at the same position. We find that the contact line motion is unexpectedly insensitive to drop volume, even when a spherical cap of fluid forms above the posts. The findings are relevant to microfluidic applications and to the control of drop shapes in ink-jet printing.

Robert J. Vrancken; Matthew L. Blow; Halim Kusumaatmaja; Ko Hermans; An M. Prenen; Cees W. M. Bastiaansen; Dirk J. Broer; Julia M. Yeomans

2012-10-23T23:59:59.000Z

429

Design of shell and tube heat exchanger using specified pressure drop.  

E-Print Network (OSTI)

??The pressure drops used in heat exchange of shell and tube type, the situations are particular and put ahead of the design exercise. In such… (more)

Bilimoria, Vimalkumar B.

2010-01-01T23:59:59.000Z

430

Co-gasification of biomass with coal and oil sands coke in a drop tube furnace.  

E-Print Network (OSTI)

??Chars were obtained from individual fuels and blends with different blend ratios of coal, coke and biomass in Drop Tube Furnace at different temperatures. Based… (more)

Gao, Chen

2010-01-01T23:59:59.000Z

431

Control of emulsion drop production in flow focusing microfluidics  

E-Print Network (OSTI)

Generating droplets using flow-focusing microfluidics in multiphase flows has reached its limit that it cannot generate submicrometer droplets in size. Flow focusing geometry together with an electric field has been used to make smaller droplets in microchannels. The droplet size was controllable by the flow rate ratio as well as the electric field. The droplets size decreased as the voltage increased. A Taylor cone was formed to generate very fine droplets which were less than 1m? in diameter. The tip made smaller droplets due to the tangential force by the electric field. A small inner flow rate and high electric field were required to form a stable Taylor cone in a DC electric field. The droplet size, however, was not stable at a small water flow rate because the flow rate was not as accuate as required. When I used a modified syringe pump with more accurate flow rate control, I was able to obtain a stable set of data. A small change in droplet size occurred at low voltage. The drop size changed dramatically, when the voltage was high enough. I also observed how an AC electric field affects the droplet size. The droplet size was not solely determined by the voltage. This is because of the imbalance of the supplied flow rate and the emitted flow rate. I also found that the droplet size is related to the tip position of the dispersed phase. The droplet size decreased as the tip stretched more. Typically, the microfluidic device generated monodispese droplets in narrow size distribution. It also generated a bigger droplet followed by a smaller one consecutively at low flow rate ratio of inner and outer fluid flow ()265.0/09.0??oiQQ. To understand this instability of drop formation, a numerical calculation was conducted. The simulation results showed inside of the tip still pointed downstream after it generated a big droplet. Then, the tip generated another smaller droplet while the tip was stretched. Finally, the tip moved back and began a new cycle.

Kim, Haejune

2007-08-01T23:59:59.000Z

432

A VAD-Based Dealiasing Method for Radar Velocity Data Quality Control  

Science Conference Proceedings (OSTI)

This paper describes a new velocity–azimuth display (VAD)-based dealiasing method developed for automated radar radial velocity data quality control to satisfy the high-quality standard and efficiency required by operational radar data ...

Qin Xu; Kang Nai; Li Wei; Pengfei Zhang; Shun Liu; David Parrish

2011-01-01T23:59:59.000Z

433

Effects of Nonuniform Beam Filling on Rainfall Retrieval for the TRMM Precipitation Radar  

Science Conference Proceedings (OSTI)

The Tropical Rainfall Measuring Mission (TRMM) will carry the first spaceborne radar for rainfall observation. Because the TRMM Precipitation Radar (PR) footprint size of 4.3 km is greater than the scale of some convective rainfall events, there ...

S. L. Durden; Z. S. Haddad; A. Kitiyakara; F. K. Li

1998-06-01T23:59:59.000Z

434

The Influence of Airborne Doppler Radar Data Quality on Numerical Simulations of a Tropical Cyclone  

Science Conference Proceedings (OSTI)

The impact of airborne Doppler radar data assimilation on improving numerical simulations of tropical cyclones (TCs) has been well recognized. However, the influence of radar data quality on the numerical simulation of tropical cyclones has not ...

Lei Zhang; Zhaoxia Pu; Wen-Chau Lee; Qingyun Zhao

2012-02-01T23:59:59.000Z

435

An Application of Linear Programming to Polarimetric Radar Differential Phase Processing  

Science Conference Proceedings (OSTI)

Differential phase and its range derivative KDP are of interest to several hydrological applications from weather radar systems. Despite the attractive qualities of polarimetric differential phase measurements, the usefulness of these radar ...

Scott E. Giangrande; Robert McGraw; Lei Lei

2013-08-01T23:59:59.000Z

436

Combination of Manually Digitized Radar and GOES IR for Real-Time Display of Rainfall Intensity  

Science Conference Proceedings (OSTI)

Manually Digitized Radar (MDR) and Geostationary Operational Environmental Satellite (GOES) thermal infrared (IR) data were merged to form a higher-resolution radar/IR product than that represented by the MDR. The combination MDR/IR maps were ...

Paul H. Heinemann; J. David Martsolf; John F. Gerber; Daniel L. Smith

1987-08-01T23:59:59.000Z

437

Radar Echo Structure, Air Motion and Hail Formation in a Large Stationary Multicellular Thunderstorm  

Science Conference Proceedings (OSTI)

Observations from aircraft, Doppler radars, surface mesonetwork, upper air network and surveillance radar are used to describe the structure and evolution of a large rain and hailstorm that occurred on 22 June 1976 in northeastern Colorado. In ...

L. J. Miller; J. C. Fankhauser

1983-10-01T23:59:59.000Z

438

Visual Cloud Histories Related to First Radar Echo Formation in Northeast Colorado Cumulus  

Science Conference Proceedings (OSTI)

Using quantitative analysis of time-lapse motion pictures from aircraft and a sensitive meteorological radar, the cloud top history is related to the early radar echo development in 12 vigorous, summer, convective cloud turrets in northeastern ...

Charles A. Knight; William D. Hall; Philip M. Roskowski

1983-06-01T23:59:59.000Z

439

Experiments in Rainfall Estimation with a Polarimetric Radar in a Subtropical Environment  

Science Conference Proceedings (OSTI)

A unique dataset consisting of high-resolution polarimetric radar measurements and dense rain gauge and disdrometer observations collected in east-central Florida during the summer of 1998 was examined. Comparison of the radar measurements and ...

Edward A. Brandes; Guifu Zhang; J. Vivekanandan

2002-06-01T23:59:59.000Z

440

Enhanced Radar Backscattering due to Oriented Ice Particles at 95 GHz during StormVEx  

Science Conference Proceedings (OSTI)

Nonspherical atmospheric ice particles can enhance radar backscattering and attenuation above that expected from spheres of the same mass. An analysis of scanning 95 GHz radar data collected during the Storm Peak Laboratory cloud property ...

Roger Marchand; Gerald G. Mace; A. Gannet Hallar; Ian B. McCubbin; Sergey Y. Matrosov; Matthew D. Shupe

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Detection of Ice Hydrometeor Alignment Using an Airborne W-band Polarimetric Radar  

Science Conference Proceedings (OSTI)

This paper presents airborne W-band polarimetric radar measurements at horizontal and vertical incidence on ice clouds using a 95-GHz radar on the University of Wyoming King Air research aircraft. Coincident, in situ measurements from probes on ...

J. Galloway; A. Pazmany; J. Mead; R. E. McIntosh; D. Leon; J. French; R. Kelly; G. Vali

1997-02-01T23:59:59.000Z

442

Evaluating Radial Current Measurements from CODAR High-Frequency Radars with Moored Current Meters  

Science Conference Proceedings (OSTI)

The performance of a network of five CODAR (Coastal Ocean Dynamics Application Radar) SeaSonde high-frequency (HF) radars, broadcasting near 13 MHz and using the Multiple Signal Classification (MUSIC) algorithm for direction finding, is described ...

Brian M. Emery; Libe Washburn; Jack A. Harlan

2004-08-01T23:59:59.000Z

443

Observations of a Colorado Tornado. Part II: Combined Photogrammetric and Doppler Radar Analysis  

Science Conference Proceedings (OSTI)

An integrated analysis of photographic and Doppler radar observations of a tornadic storm during the Convection Initiation and Downburst Experiment (CINDE) is presented. High-resolution single-Doppler radar measurements are combined with cloud ...

Roger M. Wakimoto; Brooks E. Martner

1992-04-01T23:59:59.000Z

444

Analysis and Interpretation of Dual-Polarized Radar Measurements at +45° and ?45° Linear Polarization States  

Science Conference Proceedings (OSTI)

Equations are derived for transforming radar data obtained with ±45° linear polarization states to conventional radar parameters measured at horizontal and vertical polarization states. The derivation is based on the covariance matrix and assumes ...

V. Chandrasekar; J. Hubbert; V. N. Bringi; P. F. Meischner

1994-04-01T23:59:59.000Z

445

Continuous Humidity Monitoring in a Tropical Region with the Equatorial Atmosphere Radar  

Science Conference Proceedings (OSTI)

A radar remote sensing technique that estimates humidity profiles using a wind profiler is applied to the equatorial atmosphere radar (EAR) to monitor detailed humidity variations in tropical regions. Turbulence echo power intensity is related to ...

Jun-ichi Furumoto; Toshitaka Tsuda; Satoshi Iwai; Toshiaki Kozu

2006-04-01T23:59:59.000Z

446

Dealiasing Doppler Velocities Measured by a Bistatic Radar Network during a Downburst-Producing Thunderstorm  

Science Conference Proceedings (OSTI)

The object of this paper was to develop an automated dealiasing scheme that dealiases Doppler velocities measured by a bistatic Doppler radar network. The particular network consists of the C-band polarimetric diversity Doppler radar, POLDIRAD, ...

Katja Friedrich; Olivier Caumont

2004-05-01T23:59:59.000Z

447

Incoherent scatter radar detection of enhanced plasma line in ionospheric E-region over Arecibo  

E-Print Network (OSTI)

A series of incoherent scatter radar (ISR) observation were conducted at the Arecibo Observatory from December 27, 2005 until January 3, 2006. From plasma line measurements that were taken during this radar campaign, we ...

Pradipta, Rezy

2006-01-01T23:59:59.000Z

448

Radar Reflectivity-Ice Water Content Relationships for Use above the Melting Level in Hurricanes  

Science Conference Proceedings (OSTI)

Regression equations linking radar reflectivity (Ze) and ice water content (IWC) were calculated from airborne radar and particle image data that were collected above the melting level in two hurricanes. The Ze ? IWC equation from the stratiform ...

Robert A. Black

1990-09-01T23:59:59.000Z

449

Rainfall Parameter Estimation from Dual-Radar Measurements Combining Reflectivity Profile and Path-integrated Attenuation  

Science Conference Proceedings (OSTI)

Rain rate estimation properties of multiparameter radar measurements combining radar reflectivity and microwave attenuations are studied through simulations using a two-year disdrometer dataset. In the first simulation, properties of “complete” ...

Toshiaki Kozu; Kenji Nakamura

1991-04-01T23:59:59.000Z

450

Biases of Rain Retrieval Algorithms for Spaceborne Radar Caused by Nonuniformity of Rain  

Science Conference Proceedings (OSTI)

The biases of various rain retrieval algorithms for a spaceborne rain radar due to nonuniformity of rain are studied using simple models and an actual time sequence of rainfall rate. A conventional rain retrieval algorithm in which measured radar ...

Kenji Nakamura

1991-06-01T23:59:59.000Z

451

Study of Polarization Differences in Ku-Band Ocean Radar Imagery  

Science Conference Proceedings (OSTI)

Radar returns from the sea surface can be represented as the sum of two contributions from Bragg scattering and from individual breaking events. This representation is used to analyze polarimetric radar images of ocean areas obtained at grazing ...

Andre V. Smirnov; Valery U. Zavorotny

1995-10-01T23:59:59.000Z

452

Three Methods to Determine Profiles of Reflectivity from Volumetric Radar Data to Correct Precipitation Estimates  

Science Conference Proceedings (OSTI)

The vertical variability of radar reflectivity reduces the reliability of precipitation estimation by radar, especially in complex orography. This important source of error can, at least partially, be corrected for, if the vertical profile of ...

Bertrand Vignal; Gianmario Galli; Jürg Joss; Urs Germann

2000-10-01T23:59:59.000Z

453

Simultaneous Measurement of Ocean Winds and Waves with an Airborne Coherent Real Aperture Radar  

Science Conference Proceedings (OSTI)

A coherent, X-band airborne radar has been developed to measure wind speed and direction simultaneously with directional wave spectra on the ocean. The coherent real aperture radar (CORAR) measures received power, mean Doppler shifts, and mean ...

William J. Plant; William C. Keller; Kenneth Hayes

2005-07-01T23:59:59.000Z

454

Predictability of Precipitation from Continental Radar Images. Part IV: Limits to Prediction  

Science Conference Proceedings (OSTI)

Predictability of precipitation is examined from storm to synoptic scales through an experimental approach using continent-scale radar composite images. The lifetime of radar reflectivity patterns in Eulerian and Lagrangian coordinates is taken ...

Urs Germann; Isztar Zawadzki; Barry Turner

2006-08-01T23:59:59.000Z

455

Objective Identification of Echoes Due to Anomalous Propagation in Weather Radar Data  

Science Conference Proceedings (OSTI)

Serious contamination of weather radar data can occur in atmospheric conditions that cause anomalous propagation of the radar beam. Excessive downward refraction of the beam may be sufficient to cause ground returns (“anaprop”), which may be ...

J. A. Pamment; B. J. Conway

1998-02-01T23:59:59.000Z

456

Design and Deployment of a Portable, Pencil-Beam, Pulsed, 3-cm Doppler Radar  

Science Conference Proceedings (OSTI)

A portable, pencil-beam, pulsed, Doppler, 3-cm wavelength radar has been constructed to study a wide variety of meteorological phenomena including tornadoes, severe storms, and boundary layer processes. The new radar, the Doppler on Wheels (DOW), ...

Joshua Wurman; Jerry Straka; Erik Rasmussen; Mitch Randall; Allen Zahrai

1997-12-01T23:59:59.000Z

457

CSU-CHILL Polarimetric Radar Measurements from a Severe Hail Storm in Eastern Colorado  

Science Conference Proceedings (OSTI)

Polarimetric radar measurements made by the recently upgraded CSU-CHILL radar system in a severe hailstorm are analyzed permitting for the first time the combined use of Zh, ZDR, linear depolarization ratio (LDR), KDP, and ?h? to infer ...

J. Hubbert; V. N. Bringi; L. D. Carey; S. Bolen

1998-08-01T23:59:59.000Z

458

First Radar Echoes and the Early ZDR History of Florida Cumulus  

Science Conference Proceedings (OSTI)

The early histories of radar echo and polarization differential reflectivity (ZDR) from growing cumulus clouds observed in Florida with a 10-cm-wavelength radar are reported in detail. Raindrops 1 to several millimeters in diameter are present at ...

Charles A. Knight; Jothiram Vivekanandan; Sonia G. Lasher-Trapp

2002-05-01T23:59:59.000Z

459

A Radar-Based Climatology of Thunderstorm Days across New York State  

Science Conference Proceedings (OSTI)

Archived radar reports, derived from the National Weather Service radar network, were used to estimate the average annual frequencies of thunderstorm days across New York State for the period 1978–81. The archival records consist of manually-...

Phillip D. Falconer

1984-07-01T23:59:59.000Z

460

Lightning Activity in a Hail-Producing Storm Observed with Phased-Array Radar  

Science Conference Proceedings (OSTI)

This study examined lightning activity relative to the rapidly evolving kinematics of a hail-producing storm on 15 August 2006. Data were provided by the National Weather Radar Testbed Phased-Array Radar, the Oklahoma Lightning Mapping Array, and ...

C. Emersic; P. L. Heinselman; D. R. MacGorman; E. C. Bruning

2011-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

The Vertical Structure of TOGA COARE Convection. Part I: Radar Echo Distributions  

Science Conference Proceedings (OSTI)

Radar data collected by the 5-cm MIT radar, which was deployed aboard the R/V Vickers during the intensive observing period of the Tropical Ocean Global Atmosphere Coupled Ocean–Atmosphere Response Experiment, are partitioned into convective and ...

Charlotte A. DeMott; Steven A. Rutledge

1998-09-01T23:59:59.000Z

462

Derivation of a 10-Year Radar-Based Climatology of Rainfall  

Science Conference Proceedings (OSTI)

Weather radars give quantitative precipitation estimates over large areas with high spatial and temporal resolutions not achieved by conventional rain gauge networks. Therefore, the derivation and analysis of a radar-based precipitation “...

Aart Overeem; Iwan Holleman; Adri Buishand

2009-07-01T23:59:59.000Z

463

Preliminary Results from Multiparameter Airborne Rain Radar Measurement in the Western Pacific  

Science Conference Proceedings (OSTI)

Preliminary results are presented from multiparameter airborne radar measurements of tropical storms. The experiment was conducted in the western Pacific in September 1990 with the NASA DC-8 aircraft that was equipped with a dual-wavelength radar ...

Hiroshi Kumagai; Robert Meneghini; Toshiaki Kozu

1993-02-01T23:59:59.000Z

464

An Application of Linear Programming to Polarimetric Radar Differential Phase Processing  

Science Conference Proceedings (OSTI)

Differential phase and its range derivative KDP are of interest to several hydrological applications from weather radar systems. Despite the attractive qualities of polarimetric differential phase measurements, the usefulness of these radar ...

Scott E. Giangrande; Robert McGraw; Lei Lei

465

Observations of the Small-Scale Variability of Precipitation Using an Imaging Radar  

Science Conference Proceedings (OSTI)

For many years, spatial and temporal inhomogeneities in precipitation fields have been studied using scanning radars, cloud radars, and disdrometers, for example. Each measurement technique has its own advantages and disadvantages. Conventional ...

Robert D. Palmer; Boon Leng Cheong; Michael W. Hoffman; Stephen J. Frasier; F. J. López-Dekker

2005-08-01T23:59:59.000Z

466

Vertical Structure of Hurricane Eyewalls as Seen by the TRMM Precipitation Radar  

Science Conference Proceedings (OSTI)

Statistical analysis of the vertical structure of radar echoes in the eyewalls of tropical cyclones, shown by the Tropical Rainfall Measurement Mission (TRMM) Precipitation Radar (PR), shows that the eyewall contains high reflectivities and high ...

Deanna A. Hence; Robert A. Houze Jr.

2011-08-01T23:59:59.000Z

467

Vertical Structure of Tropical Cyclone Rainbands as Seen by the TRMM Precipitation Radar  

Science Conference Proceedings (OSTI)

Ten years of data from the Tropical Rainfall Measurement Mission satellite’s Precipitation Radar (TRMM PR) show the vertical structure of tropical cyclone rainbands. Radar-echo statistics show that rainbands have a two-layered structure, with ...

Deanna A. Hence; Robert A. Houze Jr.

2012-09-01T23:59:59.000Z

468

A Study of Thunderstorm Microphysics with Multiparameter Radar and Aircraft Observations  

Science Conference Proceedings (OSTI)

Excellent agreement was found between multiparameter radar signatures of hail, raindrops, and mixed-phase precipitation and in situ precipitation particle measurements made by aircraft in a northeastern Colorado hail-storm. Radar reflectivity ...

E. A. Brandes; J. Vivekanandan; J. D. Tuttle; C. J. Kessinger

1995-11-01T23:59:59.000Z

469

The Measurement of Doppler Wind Fields with Fast Scanning Radars: Signal Processing Techniques  

Science Conference Proceedings (OSTI)

This paper discusses signal processing techniques being developed for making Doppler wind velocity measurements using airport surveillance radars. Techniques are presented and evaluated for velocity estimation using fast-rotating radars. In ...

John R. Anderson

1987-12-01T23:59:59.000Z

470

Gaussian Model Adaptive Processing in Time Domain (GMAP-TD) for Weather Radars  

Science Conference Proceedings (OSTI)

The Gaussian model adaptive processing in the time domain (GMAP-TD) method for ground clutter suppression and signal spectral moment estimation for weather radars is presented. The technique transforms the clutter component of a weather radar ...

Cuong M. Nguyen; V. Chandrasekar

2013-11-01T23:59:59.000Z

471

Meteorological and Astronomical Influences on Radar Reflectivity in the Convective Boundary Layer  

Science Conference Proceedings (OSTI)

Observations are presented of time-varying radar reflectivity during a partial solar eclipse in Oklahoma. The measurements from a radar of 10-cm wavelength, were obtained in the clear-air boundary layer. The reflectivity changes closely follow ...

Robert M. Rabin; Richard J. Doviak

1989-11-01T23:59:59.000Z

472

Multifunction Phased-Array Radar: Time Balance Scheduler for Adaptive Weather Sensing  

Science Conference Proceedings (OSTI)

Phased-array radars (PARs) have the capability of instantaneously and dynamically controlling beam position on a pulse-by-pulse basis, which allows a single radar to perform multiple functions, such as tracking multiple storms or weather and ...

Ricardo Reinoso-Rondinel; Tian-You Yu; Sebastián Torres

2010-11-01T23:59:59.000Z

473

Polarimetric Radar Analysis of Raindrop Size Variability in Maritime and Continental Clouds  

Science Conference Proceedings (OSTI)

During the Queensland Cloud Seeding Research Program, the “CP2” polarimetric radar parameter differential radar reflectivity Zdr was used to examine the raindrop size evolution in both maritime and continental clouds. The focus of this paper is to ...

James W. Wilson; Charles A. Knight; Sarah A. Tessendorf; Courtney Weeks

2011-09-01T23:59:59.000Z

474

The ELDORA/ASTRAIA Airborne Doppler Weather Radar: High-Resolution Observations from TOGA COARE  

Science Conference Proceedings (OSTI)

The ELDORA/ASTRAIA (Electra Doppler Radar/Analyese Stereoscopic par Impulsions Aeroporte) airborne Doppler weather radar was recently placed in service by the National Center for Atmospheric Research and the Centre d'étude des Environnements ...

Peter H. Hildebrand; Wen-Chau Lee; Craig A. Walther; Charles Frush; Mitchell Randall; Eric Loew; Richard Neitzel; Richard Parsons; Jacques Testud; François Baudin; Alain LeCornec

1996-02-01T23:59:59.000Z

475

A Doppler Radar Emulator with an Application to the Detectability of Tornadic Signatures  

Science Conference Proceedings (OSTI)

A Doppler radar emulator was developed to simulate the expected mean returns from scanning radar, including pulse-to-pulse variability associated with changes in viewing angle and atmospheric structure. Based on the user’s configuration, the ...

Ryan M. May; Michael I. Biggerstaff; Ming Xue

2007-12-01T23:59:59.000Z

476

Uncertainties in Oceanic Radar Rain Maps at Kwajalein and Implications for Satellite Validation  

Science Conference Proceedings (OSTI)

The Kwajalein, Marshall Islands, Tropical Rainfall Measuring Mission (TRMM) ground validation radar has provided a multiyear three-dimensional radar dataset at an oceanic site. Extensive rain gauge networks are not feasible over the ocean and, ...

Robert A. Houze Jr; Stacy Brodzik; Courtney Schumacher; Sandra E. Yuter; Christopher R. Williams

2004-08-01T23:59:59.000Z

477

Weather Radar Ground Clutter. Part II: Real-Time Identification and Filtering  

Science Conference Proceedings (OSTI)

The identification and mitigation of anomalous propagation (AP) and normal propagation (NP) ground clutter is an ongoing problem in radar meteorology. Scatter from ground-clutter targets routinely contaminates radar data and masks weather returns ...

J. C. Hubbert; M. Dixon; S. M. Ellis

2009-07-01T23:59:59.000Z

478

Doppler-Radar Measurements of Clear Air Atmospheric Turbulence at 1290 MHz  

Science Conference Proceedings (OSTI)

We present Doppler-radar observations for the refractivity turbulence structure constant CN2 obtained with the Chatanika Radar Facility, near Fairbanks, Alaska, during a 7-day observing period in October 1976.

Ben Balsley; Vern L. Peterson

1981-03-01T23:59:59.000Z

479

Objective Optimization of Weather Radar Networks for Low-Level Coverage Using a Genetic Algorithm  

Science Conference Proceedings (OSTI)

The current Weather Surveillance Radar-1988 Doppler (WSR-88D) radar network is approaching 20 years of age, leading researchers to begin exploring new opportunities for a next-generation network in the United States. With a vast list of ...

James M. Kurdzo; Robert D. Palmer

2012-06-01T23:59:59.000Z

480

Simulation and Interpretation of the Phase Data Used by the Radar Refractivity Retrieval Algorithm  

Science Conference Proceedings (OSTI)

The radar refractivity retrieval algorithm applied to radar phase measurements from ground targets can provide high-resolution, near-surface moisture estimates in time and space. The reliability of the retrieval depends on the quality of the ...

Shinju Park; Frédéric Fabry

2010-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar drop tests" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Radar and Surface Measurement of Rainfall during CaPE: 26 July 1991 Case Study  

Science Conference Proceedings (OSTI)

Conventional usage of multiparameter radar measurements for rainfall estimation has been associated with tracking the variability of the raindrop size distribution. The use of multiparameter radar measurements in a statistical framework to ...

Eugenio Gorgucci; V. Chandrasekar; Gianfranco Scarchilli

1995-07-01T23:59:59.000Z

482

A Wintertime Gulf Coast Squall Line Observed by EDOP Airborne Doppler Radar  

Science Conference Proceedings (OSTI)

An extensive wintertime squall line on 13 January 1995 occurring along the U.S. Gulf of Mexico coastline is examined using airborne radar observations combined with conventional data analysis. Flight tracks with the ER-2 Doppler radar (EDOP) ...

G. M. Heymsfield; J. B. Halverson; I. J. Caylor

1999-12-01T23:59:59.000Z

483

Hurricane Structure and Wind Fields from Stereoscopic and Infrared Satellite Observations and Radar Data  

Science Conference Proceedings (OSTI)

Infrared and stereoscopic visible satellite data from synchronized scanning of GOES-East and -West are combined with ground-based radar data for Hurricane Frederic (1979) and time-composited airborne radar for Hurricane Alien (1980) to ...

A. Frederick Hasler; K. Robert Morris

1986-06-01T23:59:59.000Z

484

The Influence of Antenna Radome on Weather Radar Calibration and Its Real-Time Assessment  

Science Conference Proceedings (OSTI)

Operational weather radars are usually equipped with a radome to reduce the wind load on the antenna and to allow continuous operation under bad weather conditions. The study is focused on quantifying the impact on radar polarimetric measurements ...

E. Gorgucci; R. Bechini; L. Baldini; R. Cremonini; V. Chandrasekar

2013-04-01T23:59:59.000Z

485

The Turbulence Structure in a Continental Stratocumulus Cloud from Millimeter-Wavelength Radar Observations  

Science Conference Proceedings (OSTI)

The turbulent-scale vertical velocity structure in a continental stratocumulus cloud is studied using a 3-mm wavelength Doppler radar operating in a vertically pointing mode. The radar observations provided 30-m sampling in the vertical with 2-s ...

Pavlos Kollias; Bruce Albrecht

2000-08-01T23:59:59.000Z

486

Attenuation Calibration of an X-Band Weather Radar Using a Microwave Link  

Science Conference Proceedings (OSTI)

The attenuation of a radar signal is a serious problem facing meteorologists and hydrologists. In heavy rain, reflectivity information can be completely lost from large portions of a radar scan. The problem is particularly acute for X-band ...

A. R. Rahimi; A. R. Holt; G. J. G. Upton; S. Krämer; A. Redder; H-R. Verworn

2006-03-01T23:59:59.000Z

487

Prognostic Equation for Radar Radial Velocity Derived by Considering Atmospheric Refraction and Earth Curvature  

Science Conference Proceedings (OSTI)

The prognostic equation for the radial velocity field observed with a Doppler radar is derived to include the effects of atmospheric refraction and earth curvature on radar-beam height and slope angle. The derived equation, called the radial ...

Qin Xu; Li Wei

2013-10-01T23:59:59.000Z

488

Systematic Variation of Observed Radar Reflectivity–Rainfall Rate Relations in the Tropics  

Science Conference Proceedings (OSTI)

The Tropical Rainfall Measuring Mission Global Validation Program provides a unique opportunity to compare radar datasets from different sites, because they are analyzed in a relatively uniform procedure. Monthly observed radar reflectivity–...

Eyal Amitai

2000-12-01T23:59:59.000Z

489

Attenuation-Based Estimates of Rainfall Rates Aloft with Vertically Pointing Ka-Band Radars  

Science Conference Proceedings (OSTI)

An approach is suggested to retrieve low-resolution rainfall rate profiles and layer-averaged rainfall rates, Ra, from radar reflectivity measurements made by vertically pointing Ka-band radars. This approach is based on the effects of ...

Sergey Y. Matrosov

2005-01-01T23:59:59.000Z

490

Observations of Two Colorado Thunderstorms by Means of a Zenith-Pointing Doppler Radar  

Science Conference Proceedings (OSTI)

A description is given of the distributions of radar reflectivity, mean Doppler velocity, vertical air velocity and Doppler-velocity variance in two thunderstorms over eastern Colorado. A zenith-pointing Doppler radar was used to obtain data at ...

Louis J. Battan

1980-05-01T23:59:59.000Z

491

The Transition from the Present Radar Dissemination System to the NEXRAD Information Dissemination Service (NIDS)  

Science Conference Proceedings (OSTI)

The National Weather Service (NWS) will begin replacing its current system of weather radars with Next Generation Weather Radars (NEXRAD) in late 1990. Presented is an overview of previous and current systems, and the replacement NEXRAD ...

Vico E. Baer

1991-01-01T23:59:59.000Z

492

Potential Role Of Dual- Polarization Radar In The Validation Of Satellite Precipitation Measurements: Rationale and Opportunities  

Science Conference Proceedings (OSTI)

Dual-polarization weather radars have evolved significantly in the last three decades culminating in operational deployment by the National Weather Service. In addition to operational applications in the weather service, dual-polarization radars ...

V. Chandrasekar; V. N. Bringi; S. A. Rutledge; Arthur Hou; Eric Smith; Gail Skofronick Jackson; E. Gorgucci; W. A. Petersen

2008-08-01T23:59:59.000Z

493

Mesobeta Profiles to Extrapolate Radar Precipitation Measurements above the Alps to the Ground Level  

Science Conference Proceedings (OSTI)

In the Alps, the volume visible by a radar is reduced because of ground clutter, elevated horizon, and earth curvature. This often inhibits a direct view on precipitation close to the ground. When using radar measurements from aloft to estimate ...

Urs Germann; Jürg Joss

2002-05-01T23:59:59.000Z

494

Tropopause Folding and the Variability of the Tropopause Height as Seen by the Flatland VHF Radar  

Science Conference Proceedings (OSTI)

The Flatland radar, a VHF wind profiler located near Urbana, Illinois, has been used to study the variability of the tropopause over the period March 1987–April 1988. The vertically directed radar beam provides an indicator of tropopause height ...

G. D. Nastrom; J. L. Green; K. S. Gage; M. R. Peterson

1989-12-01T23:59:59.000Z

495

Multilag Correlation Estimators for Polarimetric Radar Measurements in the Presence of Noise  

Science Conference Proceedings (OSTI)

The quality of polarimetric radar data degrades as the signal-to-noise ratio (SNR) decreases. This substantially limits the usage of collected polarimetric radar data to high SNR regions. To improve data quality at low SNRs, multilag correlation ...

Lei Lei; Guifu Zhang; Richard J. Doviak; Robert Palmer; Boon Leng Cheong; Ming Xue; Qing Cao; Yinguang Li

2012-06-01T23:59:59.000Z

496

Characteristics of Rainbands, Radar Echoes, and Lightning near the North Carolina Coast during GALE  

Science Conference Proceedings (OSTI)

Characteristics of mesoscale rainbands and echoes in radar reflectivity data recorded during the field phase of the Genesis of Atlantic Lows Experiment (GALE) are presented. The primary sources of data were radar microfilm and manually digitized ...

Peter P. Dodge; Robert W. Burpee

1993-07-01T23:59:59.000Z

497

Determining Weather Radar Antenna Pointing Using Signals Detected from the Sun at Low Antenna Elevations  

Science Conference Proceedings (OSTI)

A method to determine the elevation and azimuth biases of the radar antenna using solar signals observed by a scanning radar is presented. Data recorded at low elevation angles where the atmospheric refraction has a significant effect on the ...

Asko Huuskonen; Iwan Holleman

2007-03-01T23:59:59.000Z

498

Comparison of Dual-Polarization Radar Measurements of Rain with Ground-Based Disdrometer Measurements  

Science Conference Proceedings (OSTI)

Dual-polarization radar measurements of ZH and ZDR, where ZDR = 10 logZH/ZV and ZH, ZV are the radar reflectivity factors for horizontal and vertical polarizations, respectively, are compared with values derived from raindrop-size distributions ...

J. W. F. Goddard; S. M. Cherry; V. N. Bringi

1982-02-01T23:59:59.000Z

499

Oscillations in Mesocyclone Signatures with Range Owing to Azimuthal Radar Sampling  

Science Conference Proceedings (OSTI)

When a thunderstorm mesocyclone changes range relative to a Doppler radar, the deduced core diameter and mean rotational velocity of the Doppler velocity mesocyclone signature oscillate back and forth, even though the radar beam’s physical width ...

Vincent T. Wood; Rodger A. Brown

2000-01-01T23:59:59.000Z

500

Properties of Tropical Convection Observed by Millimeter-Wave Radar Systems  

Science Conference Proceedings (OSTI)

This paper describes the results of analysis of over 825 000 profiles of millimeter-wave radar (MWR) reflectivities primarily collected by zenith-pointing surface radars observing tropical convection associated with various phases of activity of ...

Graeme L. Stephens; Norman B. Wood

2007-03-01T23:59:59.000Z