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1

BAE systems brownout landing aid system technology (BLAST) system overview and flight test results  

NASA Astrophysics Data System (ADS)

Rotary wing aircraft continue to experience mishaps caused by the loss of visual situational awareness and spatial disorientation due to brownout or whiteout in dusty, sandy or snowy conditions as the downwash of the rotor blades creates obscurant clouds that completely engulf the helicopter during approaches to land. BAE Systems has developed a "see-through" brownout landing aid system technology (BLAST) based on a small and light weight 94GHz radar with proven ability to penetrate dust, coupled with proprietary antenna tracking, signal processing and digital terrain morphing algorithms to produce a cognitive real-time 3D synthetic image of the ground and proximate surface hazards in and around the landing zone. A series of ground and flight tests have been conducted at the United States Army's Yuma Proving Ground in Arizona that reflect operational scenarios in relevant environments to progressively mature the technology. A description of the BLAST solution developed by BAE Systems and results from recent flight tests is provided.

Sykora, Brian

2012-05-01

2

Results of tests of MTA-2 TPS on the SRB hold-down bolt blast container  

NASA Technical Reports Server (NTRS)

The four solid rocket booster (SRB) hold-down posts are fastened to the mobile launch platform (MLP) with four large nuts. At liftoff the nuts are split with explosive changes to release the SRB/Shuttle. A blast container is placed over the nuts to protect the vehicle from flying debris. The blast container is a reusable part and has to be protected from aerodynamic heating during flight. The thermal protection system (TPS) used to protect these blast containers is cork. Fitting the flat cork sheet to this hemispherical shaped blast container is both time consuming and expensive. Another problem is removing the charred cork and epoxy glue from the blast containers. Replacements of this cork with another TPS material such as MTA-2 was examined. Heating rates along the centerline of the forward facing areas of the blast container were determined. The feasibility of using 1/2 in. MTA-2 on the SRB blast containers for protection from ascent, plume impingement and reentry heating is demonstrated.

Dean, W. G.

1982-01-01

3

Blast overpressures from medium scale BLEVE tests  

Microsoft Academic Search

The measured blast overpressures from recent tests involving boiling liquid expanding vapour explosions (BLEVE) has been studied. The blast data came from tests where 0.4 and 2m3 ASME code propane tanks were exposed to torch and pool fires. In total almost 60 tanks were tested, and of these nearly 20 resulted in catastrophic failures and BLEVEs. Both single and two-step

A. M. Birk; C. Davison; M. Cunningham

2007-01-01

4

High explosive testing of a corrugated metal blast shelter with membrane blast doors  

SciTech Connect

In October 1983 the Defense Nuclear Agency (DNA) sponsored a high-explosive blast test, nicknamed DIRECT COURSE. This event simulated the blast effects from a one-kiloton nuclear detonation and provided an environment for the testing of selected blast and fallout shelters for their structural integrity. Under work for the Federal Emergency Management Agency (FEMA), the Oak Ridge National Laboratory (ORNL) fielded a set of experiments at the DIRECT COURSE event which were directed toward reducing the cost of blast shelter for small groups of people, such as workers in critical industries (keyworkers). Six items were tested: three scale models of a corrugated metal blast shelter and three full-size blast door closures for such a shelter. The three shelters survived blast overpressures up to 2.55 MPa (225 psi), a level which is equivalent to being approximately 800 m (0.5 mile) from a 1 megaton nuclear detonation. Each shelter model was 180 cm (6 ft.) long by 60 cm (2 ft.) in diameter, was buried about 60 cm (2 ft.) below ground level, and represented a 1/4-scale version of a full-size blast shelter which would be capable of supporting 12 to 18 occupants. The three full-size, 90 cm (35 in.) diameter, blast doors for such a shelter also successfully resisted the same range of blast overpressure. Each door weighed less than 45 kg (100 lb) and incorporated a novel, yielding-membrane design. These sheet metal membranes were between 1.3 and 2.0 mm (0.050 and 0.080 in.) thick and were supported by an edge beam (hoop).

Zimmerman, G.P.; Chester, C.V.

1984-12-01

5

Head Kinematics Resulting from Simulated Blast Loading Scenarios.  

National Technical Information Service (NTIS)

Blast wave overpressure has been associated with varying levels of traumatic brain injury in soldiers exposed to blast loading. In realistic blast loading scenarios, the mechanisms of primary blast injury are not well known due to the complex interactions...

A. Bouamoul D. Singh D. S. Cronin P. A. Lockhart T. N. Haladuick

2012-01-01

6

Blast testing of expedient shelters in model scale  

SciTech Connect

A research program was conducted to evaluate the blast resistance of expedient fallout shelters designed for the civilian population in the event of a nuclear attack. As part of this research, model-size shelters of six different designs were tested in a shock tunnel at average overpressure levels of 2.8, 4.6, and 8.8 psi. Measurements of the external blast pressures and internal pressure leakage into the model shelters were made. The expedient shelters tested utilize, in general, shallow soil excavation, load-bearing members of timber or doors, and soil-covered roofs. Replica model sizes were selected so that the shock tunnel load durations were long enough to test in the quasi-static load realm. Some of the shelter designs survived at every overpressure level very well, while other tests items suffered structural failures in almost every case. This paper presents a brief description of the experiments, including some details of the shelters, of the model fabrication and pressure measurement system, and a summary of the results.

Esparza, E.D.

1986-08-01

7

Results of experimental drilling and blasting operations in preparing the rock foundation of the Krapivinskii hydroelectric station  

Microsoft Academic Search

The purpose of the experimental drilling and blasting operations in preparing the rock foundation of the Krapivinskii hydrostation was to test under specific conditions the parameters of blasting near the lower contour of the pit with reduced blasthole charges. Results show: the possibility of replacing shothole by blasthole charges with parameters calculated by a special method; the suitability of the

A. E. Azarovich; V. N. Yanovskii

1985-01-01

8

Results of experimental drilling and blasting operations in preparing the rock foundation of the Krapivinskii hydroelectric station  

SciTech Connect

The purpose of the experimental drilling and blasting operations in preparing the rock foundation of the Krapivinskii hydrostation was to test under specific conditions the parameters of blasting near the lower contour of the pit with reduced blasthole charges. Results show: the possibility of replacing shothole by blasthole charges with parameters calculated by a special method; the suitability of the method of calculating the parameters of DBO's with reduced blasthole charges developed earlier by Gidrospetsproekt, which provides preservation of the foundations of important structures with a reduction of labor intensity and work time, was confirmed; an analysis of the results of the experimental blasts and also for a number of hydrotechnical construction objects made it possible to evaluate the characteristics of irregularities of foundations with blasting preparation and to establish their practically allowable values for use in specifications; rational parameters of blasting near the foundation of the Krapivinskii hydrostation were determined.

Azarovich, A.E.; Yanovskii, V.N.

1985-05-01

9

Assessment, development, and testing of glass for blast environments.  

SciTech Connect

Glass can have lethal effects including fatalities and injuries when it breaks and then flies through the air under blast loading (''the glass problem''). One goal of this program was to assess the glass problem and solutions being pursued to mitigate it. One solution to the problem is the development of new glass technology that allows the strength and fragmentation to be controlled or selected depending on the blast performance specifications. For example the glass could be weak and fail, or it could be strong and survive, but it must perform reliably. Also, once it fails it should produce fragments of a controlled size. Under certain circumstances it may be beneficial to have very small fragments, in others it may be beneficial to have large fragments that stay together. The second goal of this program was to evaluate the performance (strength, reliability, and fragmentation) of Engineered Stress Profile (ESP) glass under different loading conditions. These included pseudo-static strength and pressure tests and free-field blast tests. The ultimate goal was to provide engineers and architects with a glass whose behavior under blast loading is less lethal. A near-term benefit is a new approach for improving the reliability of glass and modifying its fracture behavior.

Glass, Sarah Jill

2003-06-01

10

BlaSTorage: a fast package to parse, manage and store BLAST results  

PubMed Central

Background Large-scale sequence studies requiring BLAST-based analysis produce huge amounts of data to be parsed. BLAST parsers are available, but they are often missing some important features, such as keeping all information from the raw BLAST output, allowing direct access to single results, and performing logical operations over them. Findings We implemented BlaSTorage, a Python package that parses multi BLAST results and returns them in a purpose-built object-database format. Unlike other BLAST parsers, BlaSTorage retains and stores all parts of BLAST results, including alignments, without loss of information; a complete API allows access to all the data components. Conclusions BlaSTorage shows comparable speed of more basic parser written in compiled languages as C++ and can be easily integrated into web applications or software pipelines.

2013-01-01

11

Blast Tests of Expedient Shelters in the DICE THROW Event.  

National Technical Information Service (NTIS)

To determine the worst blast environments that eight types of expedient shelters can withstand, the authors subjected a total of 18 shelters to the 1-kiloton blast effects of Defense Nuclear Agency's DICE THROW main event. These expedient shelters include...

C. H. Kearny, C. V. Chester

1978-01-01

12

Measurement of field blast testing data using high speed data acquisition system for steel fiber reinforced concrete  

Microsoft Academic Search

This paper reports on a measurement of field blast testing data for steel fiber reinforced concrete using high speed data acquisition system. In this experiment a field blast test was conducted by the Blast Research Unit of University Pertahanan Nasional Malaysia to investigate the behavior of steel fiber reinforced concrete panel subjected to air blast loading. The steel fiber reinforced

Mohammed Alias Yusof; Norazman Mohamad Nor; Ariffin Ismail; Risby Sohaimy; Nik Ghazali Nik Daud; Ng Choy Peng; Muhammad Fauzi Muhamad Zain

2011-01-01

13

Small-scale tunnel test for blast performance  

NASA Astrophysics Data System (ADS)

The data reported here provide a validation of a small-scale tunnel test as a tool to guide the optimization of new explosives for blast performance in tunnels. The small-scale arrangement consisted of a 2-g booster and 10-g sample mounted at the closed end of a 127mm diameter by 4.6-m long steel tube with pressure transducers along its length. The three performance characteristics considered were peak pressure, initial energy release, and impulse. The relative performance from five explosives was compared to that from a 1.16-m diameter by 30-m long tunnel that used 2.27-kg samples. The peak pressure values didn't correlate between the tunnels. Partial impulse for the explosives did rank similarly. The initial energy release was determined from a one-dimensional point-source analysis, which nearly tracked with impulse suggesting additional energy released further down the tunnel for some explosives. This test is a viable tool for optimizing compositional variations for blast performance in target scenarios of similar geometry.

Felts, J. E.; Lee, R. J.

2014-05-01

14

Performance on Tests of Central Auditory Processing by Individuals Exposed to High-Intensity Blasts.  

National Technical Information Service (NTIS)

Thirty-six blast-exposed patients and twenty-nine non-blast-exposed control subjects were tested on a battery of behavioral and electrophysiological tests that have been shown to be sensitive to central auditory processing deficits. Abnormal performance a...

A. C. Diedesch F. J. Gallun L. R. Kubli R. L. Folmer T. C. Walden

2012-01-01

15

Small-scale chamber test for internal blast performance  

NASA Astrophysics Data System (ADS)

The viability of using gram-scale amounts of explosives in a small test chamber to assess internal blast performance and predict effects at larger scales is investigated. Peak quasi-static pressures from five explosive formulations were measured, and energy released per gram was calculated. The smaller test used 12-g charges loaded in a steel holder, while data selected from the larger test was from bare charges between 2.7 and 21 kg. The energies for a given explosive were comparable for each size charge tested in the larger chamber. In the smaller chamber the energies were less, most likely due to heat losses to the holder. Explosives with the highest concentration of explosive ingredients incurred the highest energy losses in the small chamber. The current design of the smaller test provides a reasonable ranking of explosives with similar concentrations of explosive ingredients, thereby validating the use of the test for the newer explosives being assessed. However, it may be possible to obtain consistent rankings for all explosives given a change to the holder design in the smaller test.

Lee, Richard J.; Felts, Joshua E.; Watry, Craig; Gonzales, Andrea

2014-05-01

16

Stalfiberarmerade Betongplattor Utsatta foer Detonationslaster i Stoetvagstub. Maetresultat (Steel Fibre Reinforced Concrete Slabs Subjected to Blast Loading in a Shock Tube. Measurements Results).  

National Technical Information Service (NTIS)

In the report, measurement results are presented from blast loadings performed at the test and research station at Maersta in 1996. Experiments were performed on 12 slabs of steel fiber and conventionally reinforced concrete slabs subjected to various lev...

L. Agardh

1997-01-01

17

Blast Tests of Expedient Shelters in the DICE THROW Event.  

National Technical Information Service (NTIS)

To determine the worst blast environments that eight types of expedient shelters can withstand, we subjected a total of 18 shelters to the 1-kiloton blast effects of Defense Nuclear Agency's DICE THROW main event. These expedient shelters included two Rus...

C. H. Kearny, C. V. Chester

1978-01-01

18

49 CFR Appendix D to Part 173 - Test Methods for Dynamite (Explosive, Blasting, Type A)  

Code of Federal Regulations, 2013 CFR

...Test Methods for Dynamite (Explosive, Blasting, Type A) D Appendix D to Part 173 Transportation Other Regulations Relating...REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS Pt. 173, App. D Appendix D to Part 173âTest Methods for...

2013-10-01

19

The PARIGA server for real time filtering and analysis of reciprocal BLAST results.  

PubMed

BLAST-based similarity searches are commonly used in several applications involving both nucleotide and protein sequences. These applications span from simple tasks such as mapping sequences over a database to more complex procedures as clustering or annotation processes. When the amount of analysed data increases, manual inspection of BLAST results become a tedious procedure. Tools for parsing or filtering BLAST results for different purposes are then required. We describe here PARIGA (http://resources.bioinformatica.crs4.it/pariga/), a server that enables users to perform all-against-all BLAST searches on two sets of sequences selected by the user. Moreover, since it stores the two BLAST output in a python-serialized-objects database, results can be filtered according to several parameters in real-time fashion, without re-running the process and avoiding additional programming efforts. Results can be interrogated by the user using logical operations, for example to retrieve cases where two queries match same targets, or when sequences from the two datasets are reciprocal best hits, or when a query matches a target in multiple regions. The Pariga web server is designed to be a helpful tool for managing the results of sequence similarity searches. The design and implementation of the server renders all operations very fast and easy to use. PMID:23667459

Orsini, Massimiliano; Carcangiu, Simone; Cuccuru, Gianmauro; Uva, Paolo; Tramontano, Anna

2013-01-01

20

Medium-Scale Traveling Ionospheric Disturbances (MSTIDs) resulting from Chelyabinsk Meteor Blast  

NASA Astrophysics Data System (ADS)

A global network of GPS receivers continuously make line-of-sight (LOS) measurements of the total electron content (TEC) of the ionosphere. This TEC measurement data can be analyzed to 'persistently monitor' natural and man-made activity in the atmosphere (such as volcanic eruptions, earthquakes, rocket launches, etc) which propagate into the ionosphere to produce TIDs (Traveling Ionospheric Disturbances). As an example we have analyzed in detail the TIDs resulting from the 15 Feb 2013 Chelyabinsk meteor blast as observed by the Artu GPS receiver site in Arti, Russia close to the event. Seven of the GPS satellite measurements with LOS pierce points within 1000 km of the blast show disturbances. Four of these clearly show VTEC oscillations with ~12 minute periods. The other three show much weaker responses, but their LOS pierce points are far from the blast and their aspects between the geomagnetic field & blast propagation vector are unfavorable (near broadside). By fitting all seven measurements we estimate a propagation speed of ~380 m/s for these medium-scale TIDs. As future 'persistent surveillance' efforts we intend to investigate the observability of man-made activities such as static rocket engine firings in TEC measurements. Analysis of MSTIDs resulting from the Chelyabinsk meteor blast

Sheeks, B. J.; Warren, N.; Coster, A. J.

2013-12-01

21

Testing and modeling the dynamic response of foam materials for blast protection  

Microsoft Academic Search

The pressure wave released from an explosion can cause injury to the lungs. A personal armor system concept for blast lung injury protection consists of a polymer foam layer behind a rigid armor plate to be worn over the chest. This research develops a method for testing and modeling the dynamic response of foam materials to be used for down-selection

John H. Fitek

2010-01-01

22

Blast tests of a mobile satellite tracking antenna and of two model antennas  

Microsoft Academic Search

A mobile satellite tracking antenna was subjected to blast waves emerging from the open end of an eight foot diameter shock tube. Response data were obtained by the use of strain gages and an accelerometer. Two similarly instrumented simple model antennas were also tested within the shock tube.

R. Abrahams; B. P. Bertrand; R. J. Pearson

1976-01-01

23

Principles and problems underlying testing the effectiveness of blast protective footwear.  

PubMed

Anti-personnel landmines are a continuing threat to soldiers and civilians working overseas in post conflict situations. Several groups of governmental and commercial scientists are currently designing and/or testing footwear to protect the lower leg from the effects of close proximity blast. The general principles surrounding testing of protective footwear are examined together with an assessment of the known progress to date and the strengths and weaknesses of the designs produced. PMID:12024891

Chaloner, E J; McMaster, J; Hinsley, D E

2002-03-01

24

Neuropsychological Test Performance in Soldiers With Blast-Related Mild TBI  

Microsoft Academic Search

This exploratory study was conducted to increase understanding of neuropsychological test performance in those with blast-related mild traumatic brain injury (mTBI). The two variables of interest for their impact on test performance were presence of mTBI symptoms and history of posttraumatic stress disorder (PTSD). Forty-five soldiers postblast mTBI, 27 with enduring mTBI symptoms and 18 without, completed a series of

Lisa A. Brenner; Heidi Terrio; Beeta Y. Homaifar; Peter M. Gutierrez; Pamela J. Staves; Jeri E. F. Harwood; Dennis Reeves; Lawrence E. Adler; Brian J. Ivins; Katherine Helmick; Deborah Warden

2010-01-01

25

HIGH PRODUCTIVITY VACUUM BLASTING SYSTEM  

SciTech Connect

The objective of this project is to improve the productivity and lower the expense of existing vacuum blasting technology. This technology is used to remove radioactive contamination, PCBs, and lead-based paint and provides worker protection by continuously recycling the material and dust for the decontamination tasks. The proposed work would increase the cleaning rate and provide safe and cost-effective decontamination of the DOE sites. This work focuses on redesigning and improving existing vacuum blasting technology including blast head nozzles, ergonomic handling of the blast head by reducing its weight; brush-ring design, vacuum level regulator, efficiency of the dust separator, and operational control sensors. The redesign is expected to enhance the productivity and economy of the vacuum blasting system by at least 50% over current vacuum blasting systems. There are three phases in the project. Phase I consists of developing and testing mathematical models. Phase II consists of pre-prototype design and fabrication and pre-prototype unit testing. Phase III consists of prototype design and field verification testing. In phase I, mathematical models are developed and analyzed for the nozzle, blast head, wind curtain, and dust separator, first as individual devices and then combined as an integrated model. This allows study of respective airflow and design parameters. The Contractor shall, based on the results of the mathematical modeling studies, design experimental models of the components and test these models. In addition, the Contractor shall develop sensors to detect the relationship of the blast head to the blast surfaces and controls to minimize the dependency on an operator's skill and judgment to obtain optimum positioning, as well as real-time characterization sensors to determine as the blast head is moving the depth to which coatings must be removed, thereby improving production and minimizing waste. In phase II, the Contractor shall design and construct a pre-prototype of the nozzle, blast head with wind curtain, sensors, and dust separator and test this system to assess the performance of the new design under controlled conditions at the contractor's facility. In phase III, the Contractor shall design and construct a prototype of the High Productivity Vacuum Blasting System, based on the results of the pre-prototype design and testing performed. This unit will be a full-scale prototype and will be tested at a designated Department of Energy (DOE) facility. Based on the results, the system performance, the productivity, and the economy of the improved vacuum blasting system will be evaluated.

William S. McPhee

1999-05-31

26

Blast tests of expedient shelters in the Misers Bluff event. Final report, February 1978-January 1980  

SciTech Connect

Expedient shelters were blast-tested by a conventional explosion equivalent to a 0.2 KT nuclear explosion. The estimated survivabilities in a large nuclear explosion are: (1) improved Small-Pole Shelter, 345 kPa (50 psi); (228) triangular entryway and blastdoor made of poles, 173 kPa (25 psi); (3) Chinese A-Frame Pole Shelter, 48 kPa (7 psi); and (4) lightly shored Pole-Covered Trench Shelters, 103 kPa (15 psi).

Kearny, C.H.; Chester, C.V.; York, E.N.

1980-01-01

27

Clean Coal III Project: Blast Furnace Granular Coal Injection Project Trail 1 Report - Blast Furnace Granular Coal Injection - Results with Low Volatile Coal  

SciTech Connect

This report describes the first coal trial test conducted with the Blast Furnace Granular Coal Injection System at Bethlehem Steel Corporation's Burns Harbor Plant. This demonstration project is divided into three phases: Phase I - Design Phase II - Construction Phase III - Operation The design phase was conducted in 1991-1993, Construction of the facility began in August 1993 and was completed in late 1994. The coal injection facility began operating in January 1995 and Phase III began in November 1995. The Trial 1 base test on C furnace was carried out in October 1996 as a comparison period for the analysis of the operation during subsequent coal trials.

None

1997-11-01

28

Clean Coal III Project: Blast Furnace Granular Coal Injection Project Trial 1 Report - Blast Furnace Granular Coal Injection - Results with Low Volatile Coal  

SciTech Connect

This report describes the first coal trial test conducted with the Blast Furnace Granular Coal Injection System at Bethlehem Steel Corporation's Burns Harbor Plant. This demonstration project is divided into three phases: Phase I - Design Phase II - Construction Phase III - Operation The design phase was conducted in 1991-1993. Construction of the facility began in August 1993 and was completed in late 1994. The coal injection facility began operating in January 1995 and Phase III began in November 1995. The Trial 1 base test orI C furnace was carried out in October 1996 as a comparison period for the analysis of the operation during subsequent coal trials.

None

1997-11-01

29

Lithium cell test results  

NASA Technical Reports Server (NTRS)

Three lithium SO2 cells, two lithium CF cells, and a vinyl chloride cell, all with crimped seals, and all strictly experimental, were independently discharged on resistors. Three temperatures were used and several different storage temperatures. Discharge rate generally on the nominal discharges were 0.1 amp, 0.5 amp, and 1 amp. Tests results show that the crimp seals are inadequate, especially for the SO2 cells. Normal discharges present no hazards. All cells discharge to zero. The problem of lithium cell explosions, such as occurred during off-limits testing, is discussed.

Bragg, B. J.

1977-01-01

30

Climax granite test results  

SciTech Connect

The Lawrence Livermore Laboratory (LLL), as part of the Nevada Nuclear Waste Storage Investigations (NNWSI) program, is carrying out in situ rock mechanics testing in the Climax granitic stock at the Nevada Test Site (NTS). This summary addresses only those field data taken to date that address thermomechanical modeling for a hard-rock repository. The results to be discussed include thermal measurements in a heater test that was conducted from October 1977 through July 1978, and stress and displacement measurements made during and after excavation of the canister storage drift for the Spent Fuel Test (SFT) in the Climax granite. Associated laboratory and field measurements are summarized. The rock temperature for a given applied heat load at a point in time and space can be adequately modeled with simple analytic calculations involving superposition and integration of numerous point source solutions. The input, for locations beyond about a meter from the source, can be a constant thermal conductivity and diffusivity. The value of thermal conductivity required to match the field data is as much as 25% different from laboratory-measured values. Therefore, unless we come to understand the mechanisms for this difference, a simple in situ test will be required to obtain a value for final repository design. Some sensitivity calculations have shown that the temperature field is about ten times more sensitive to conductivity than to diffusivity under the test conditions. The orthogonal array was designed to detect anisotropy. After considering all error sources, anisotropic efforts in the thermal field were less than 5 to 10%.

Ramspott, L.D.

1980-01-15

31

Realistic warhead and blast shield testing of chemical energy tandem warhead systems for advanced antitank missiles  

SciTech Connect

The results of dynamic sled track performance testing of advanced tandem configuration shaped-charge warheads against multiple-reactive-element tank armors are presented. Tandem configurations utilizing both currently fielded and experimental shaped-charge warheads were tested. Sled velocities used were between 400 and 1100 ft/s (Mach number 0.35 to 0.95), typical of the terminal approach velocity of TOW-type antitank missiles. High-speed motion pictures (5000 frames/s) of the sled in operation and a typical mock missile'' warhead package approaching the target are shown. Details of the sled design and fabrication and of the warhead package design and fabrication are presented. Sled track instrumentation is discussed. This instrumentation includes foil make/break switches and associated time interval meters (TIM) and digital delay units (DDU), magnetic Hall-effect transistors for measuring sled trajectory, and flash x-rays (FXR). Methods for timing the x-rays are presented. Schematic functional diagrams of the experimental setups are also given. Evidence of the ability to accurately time the delay between precursor and main warheads for even very long time delays are presented. FXR pictures illustrate the dynamics of the interaction of the jets with various target elements. The interaction dynamics of the jets is discussed in relation to the overall penetration performance of the tandem warhead. The use of x-ray fluorescence spectroscopy to help diagnose interaction dynamics is illustrated. The results of a test utilizing the missile propulsion rocket motor as a blast shield is presented in this paper. 2 refs., 22 figs.

Fradkin, D.B.; Hull, L.M.; Laabs, G.W.

1990-01-01

32

ATLAS beam test results  

NASA Astrophysics Data System (ADS)

Many different configurations of electronics and semiconductor strip detectors were studied in 1995 using the ATLAS tracking detector test area at the H8 beam-line of the CERN SPS. A significant fraction of these investigations are presented elsewhere in this volume and this paper will concentrate on the results with silicon strip detectors read out with electronics preserving the pulse height information. Data has been collected with the ADAM, APV5 and FElix read-out chips on a number of different detectors. The first results are presented for read out with LHC electronics of detectors to the ATLAS-A specification of 112.5 ?m pitch, employing n-strips in n-type silicon, capacitive coupling and intermediate strips. It is demonstrated that with adequate signal/noise, a spatial resolution of ?13 ?m is attainable with these detectors.

Beringer, J.; Borer, K.; Dawson, I.; Dowell, J. D.; Homer, R. J.; Kenyon, I. R.; Oglesby, S. J.; Shaylor, H. R.; Wilson, J. A.; Carter, J. R.; Goodrick, M. J.; Hill, J. C.; Munday, D. J.; Parker, M. A.; Robinson, D.; Wyllie, K. H.; Anghinolfi, F.; Boulter, B.; Kappes, A.; Langhans, W.; Ratz, K.; Roe, S.; Weilhammer, P. E.; Gadomski, S.; Godlewski, J.; Kaplon, J.; Andrle, J.; Stavropoulos, G.; Bonino, R.; Clark, A. G.; Couyoumtzelis, C.; Demierre, Ph.; LaMarra, D.; Allport, P. P.; Booth, P. S. L.; Bowcock, T. J. V.; Green, C.; Greenall, A.; hanlon, M.; Jackson, J. N.; Jones, T. J.; Richardson, J. D.; Smith, N. A.; Turner, P. R.; Tzamarias, S. E.; Beck, G. A.; Carter, A. A.; Newman-Coburn, D.; Pritchard, T. W.; Fares, F.; Moorhead, G. F.; Taylor, G. N.; Holt, A.; Nygård, E.; Ødegård, T.; Østby, J.; Stapnes, S.; Sundal, B.; von der Lippe, H.; Brooks, C. B.; Grewal, A. S.; Nickerson, R. B.; Shield, P.; Weidberg, A. R.; Apsimon, R. J.; Bizzell, J.; Gibson, M. D.; Murray, W.; Morrisey, M. C.; Tyndel, M.; Albiol, F.; Fuster, J.

1996-02-01

33

Pilot plant testing of Illinois coal for blast furnace injection. Quarterly report, 1 December 1994--28 February 1995  

SciTech Connect

A potentially new use for Illinois coal is its use as a fuel injected into a blast furnace to produce molten iron as the first step in steel production. Because of its increasing cost and decreasing availability, metallurgical coke is now being replaced by coal injected at the tuyere area of the furnace where the blast air enters. The purpose of this study is to evaluate the combustion of Illinois coal in the blast furnace injection process in a new and unique pilot plant test facility. This investigation is significant to the use of Illinois coal in that the limited research to date suggests that coals of low fluidity and moderate to high sulfur and chlorine contents are suitable feedstocks for blast furnace injection. This study is unique in that it is the first North American effort to directly determine the nature of the combustion of coal injected into a blast furnace. This proposal is a follow-up to one funded for the 1993--94 period. It is intended to complete the study already underway with the Armco and Inland steel companies and to demonstrate quantitatively the suitability of both the Herrin No. 6 and Springfield No. 5 coals for blast furnace injection. The main feature of the current work is the testing of Illinois coals at CANMET`s (Canadian Centre for Mineral and Energy Technology) pilot plant coal combustion facility. This facility simulates blowpipe-tuyere conditions in an operating blast furnace, including blast temperature (900{degrees}C), flow pattern (hot velocity 200 m/s), geometry, gas composition, coal injection velocity (34 m/s) and residence time (20 ms). The facility is fully instrumented to measure air flow rate, air temperature, temperature in the reactor, wall temperature, preheater coil temperature and flue gas analysis. During this quarter there were two major accomplishments.

Crelling, J.C.

1995-12-31

34

Pilot plant testing of Illinois coal for blast furnace injection. Technical report, September 1--November 30, 1994  

SciTech Connect

The purpose of this study is to evaluate the combustion of Illinois coal in the blast furnace injection process in a new and unique pilot plant test facility. This investigation is significant to the use of Illinois coal in that the limited research to date suggests that coals of low fluidity and moderate to high sulfur and chlorine contents are suitable feedstocks for blast furnace injection. This study is unique in that it is the first North American effort to directly determine the nature of the combustion of coal injected into a blast furnace. It is intended to complete the study already underway with the Armco and Inland steel companies and to demonstrate quantitatively the suitability of both the Herrin No. 6 and Springfield No. 5 coals for blast furnace injection. The main feature of the current work is the testing of Illinois coals at CANMET`s (Canadian Centre for Mineral and Energy Technology) pilot plant coal combustion facility. This facility simulates blowpipe-tuyere conditions in an operating blast furnace, including blast temperature (900 C), flow pattern (hot velocity 200 m/s), geometry, gas composition, coal injection velocity (34 m/s) and residence time (20 ms). The facility is fully instrumented to measure air flow rate, air temperature, temperature in the reactor, wall temperature, preheater coil temperature and flue gas analysis. During this quarter a sample of the Herrin No. 6 coal (IBCSP 112) was delivered to the CANMET facility and testing is scheduled for the week of 11 December 1994. Also at this time, all of the IBCSP samples are being evaluated for blast furnace injection using the CANMET computer model.

Crelling, J.C. [Southern Illinois Univ., Carbondale, IL (United States). Dept. of Geology

1994-12-31

35

Dissociated methanol test results  

Microsoft Academic Search

The design and testing of an automotive fuel system that provides hydrogen-rich gases to an internal combustion engine by catalytically cracking, or dissociating, methanol on board the vehicle is described. The vaporization and dissociation of methanol absorb heat from the engine exhaust and increase the lower heating value of the fuel by approximately 22%. In addition, raising the compression ratio

J. G. Finegold; J. T. McKinnon

1982-01-01

36

Felborrningen och dess Spraengtekniska Konsekvenser: -ett Utkast till Datorstoedd Utvaerdering (Drill Hole Deviation Resulting from Consequences of Blasting).  

National Technical Information Service (NTIS)

During the follow-up of the driving of the Storsjo Tunnel in 1987-89, SveDeFo and Skanska have developed both a measuring method and computer programs to evaluate the drill hole deviations from plan and the resulting consequences on the blasting. The work...

F. Ouchterlony L. Karlsson M. Wistedt

1989-01-01

37

Delayed-blasting tests to improve highwall stability - a final report. Report of Investigations/1986  

SciTech Connect

The Bureau of Mines conducted a series of delayed-blasting experiments at a Barbour County, WV, contour coal mine that resulted in smoother highwalls. The highwalls were smoother due to reduced overbreak (excessive rock breakage beyond the excavation limit) and were inherently safer due to reduced likelihood of rockfall. The experiments were directed at reducing overbreak without special drilling or significant additional cost. Reduced overbreak was accomplished by increasing the highwall hole delays, which changed the effective delay-pattern geometry and the direction of burden movement.

Stachura, V.J.; Fletcher, L.R.; Peltier, M.A.

1986-01-01

38

Nineteen-Foot Diameter Explosively Driven Blast Simulator  

SciTech Connect

This report describes the 19-foot diameter blast tunnel at Sandia National Laboratories. The blast tunnel configuration consists of a 6 foot diameter by 200 foot long shock tube, a 6 foot diameter to 19 foot diameter conical expansion section that is 40 feet long, and a 19 foot diameter test section that is 65 feet long. Therefore, the total blast tunnel length is 305 feet. The development of this 19-foot diameter blast tunnel is presented. The small scale research test results using 4 inch by 8 inch diameter and 2 foot by 6 foot diameter shock tube facilities are included. Analytically predicted parameters are compared to experimentally measured blast tunnel parameters in this report. The blast tunnel parameters include distance, time, static, overpressure, stagnation pressure, dynamic pressure, reflected pressure, shock Mach number, flow Mach number, shock velocity, flow velocity, impulse, flow duration, etc. Shadowgraphs of the shock wave are included for the three different size blast tunnels.

VIGIL,MANUEL G.

2001-07-01

39

Full-scale testing and numerical modeling of a multistory masonry structure subjected to internal blast loading  

NASA Astrophysics Data System (ADS)

As military and diplomatic representatives of the United States are deployed throughout the world, they must frequently make use of local, existing facilities; it is inevitable that some of these will be load bearing unreinforced masonry (URM) structures. Although generally suitable for conventional design loads, load bearing URM presents a unique hazard, with respect to collapse, when exposed to blast loading. There is therefore a need to study the blast resistance of load bearing URM construction in order to better protect US citizens assigned to dangerous locales. To address this, the Department of Civil and Environmental Engineering at the University of North Carolina at Charlotte conducted three blast tests inside a decommissioned, coal-fired, power plant prior to its scheduled demolition. The power plant's walls were constructed of URM and provided an excellent opportunity to study the response of URM walls in-situ. Post-test analytical studies investigated the ability of existing blast load prediction methodologies to model the case of a cylindrical charge with a low height of burst. It was found that even for the relatively simple blast chamber geometries of these tests, simplified analysis methods predicted blast impulses with an average net error of 22%. The study suggested that existing simplified analysis methods would benefit from additional development to better predict blast loads from cylinders detonated near the ground's surface. A hydrocode, CTH, was also used to perform two and three-dimensional simulations of the blast events. In order to use the hydrocode, Jones Wilkins Lee (JWL) equation of state (EOS) coefficients were developed for the experiment's Unimax dynamite charges; a novel energy-scaling technique was developed which permits the derivation of new JWL coefficients from an existing coefficient set. The hydrocode simulations were able to simulate blast impulses with an average absolute error of 34.5%. Moreover, the hydrocode simulations provided highly resolved spatio-temporal blast loading data for subsequent structural simulations. Equivalent single-degree-of-freedom (ESDOF) structural response models were then used to predict the out-of-plane deflections of blast chamber walls. A new resistance function was developed which permits a URM wall to crack at any height; numerical methodologies were also developed to compute transformation factors required for use in the ESDOF method. When combined with the CTH derived blast loading predictions, the ESDOF models were able to predict out-of-plane deflections with reasonable accuracy. Further investigations were performed using finite element models constructed in LS-DYNA; the models used elastic elements combined with contacts possessing a tension/shear cutoff and the ability to simulate fracture energy release. Using the CTH predicted blast loads and carefully selected constitutive parameters, the LS-DYNA models were able to both qualitatively and quantitatively predict blast chamber wall deflections and damage patterns. Moreover, the finite element models suggested several modes of response which cannot be modeled by current ESDOF methods; the effect of these response modes on the accuracy of ESDOF predictions warrants further study.

Zapata, Brian Jarvis

40

Your Kidney Test Results  

MedlinePLUS

... lower the amount of calcium in your bones. Phosphorus Normal: 2.7 to 4.6* Your Result: Phosphorus is important for strong bones and healthy blood ... 65 Your Result: PTH controls the calcium and phosphorus levels in your blood. It is needed to ...

41

Characterization of Microbial Communities in Subsurface Nuclear Blast Cavities of the Nevada Test Site  

SciTech Connect

This exploratory research project is designed to test fundamental hypotheses concerning the possible existence and nature of indigenous microbial populations in Nevada Test Site (NTS) subsurface nuclear blast cavities. Although subsurface microbiological studies have been performed at the NTS in the past, radioactive zones have yet to be addressed. Nuclear blast zone microbiology is a completely new field and our team is well-positioned to collect and analyze samples that have never before been available to microbiologists. Relevant samples are now being obtained by incorporating microbiological collections into an ongoing annual hot well sampling program being conducted by other agencies. A combination of cultivation-based and molecular microbial detection protocols is being utilized at multiple locations to survey for uncultivable microorganisms and to develop a culture collection which will be characterized for radionuclide- and metal-reduction capabilities. Given that redox manipulations mediated by microorganisms can impact the mobility of DOE contaminants, a positive outcome from this work would have significant implications for management strategies at this and other DOE sites. A primary objective of the project has been the establishment of the regulatory and technical framework necessary to enable our acquisition of samples. Thus, much of our activity in the first phase of this work has involved the development an approved Field Area Work Plan (FAWP), Radiological Work Permit (RWP), and other documentation required for radiological work at the NTS. We have also invested significant time into ensuring that all personnel possess the required training (e.g. Radworker II and 40 hr. HAZWOPER) for access to the hot well sampling sites. Laboratory facilities, required for field processing of radioactive samples as well as DNA extraction and other manipulations, have been secured both the NTS (Mercury, NV) and UNLV. Although our year-1 field work was delayed due to non-availability of samples, an aggressive sampling campaign is now underway and our first hot well samples were collected on Feb 5th, 2008. The unique nature of this site, coupled with the combined expertise of the collaborating laboratories (DRI, LLNL, PNNL, and the Harry Reid Center) makes the likelihood of our achieving discoveries of value to DOE, the individual researchers, and society high. As the selective pressures at atomic blast sites are probably different from those of production and disposal sites, these habitats may contain novel organisms of utility for bioremediation. Such organisms will have had to develop physiological mechanisms to survive high doses of ionizing radiation over the variety of rock types and hydrologic environments present at the NTS.

Duane Moser; Chuck Russell; Matthew Marshall; Ken Czerwinski; Michael J. Daly; Mavrik Zavarin

2008-02-08

42

Pilot plant testing of Illinois coal for blast furnace injection. Technical report, September 1--November 30, 1994.  

National Technical Information Service (NTIS)

The purpose of this study is to evaluate the combustion of Illinois coal in the blast furnace injection process in a new and unique pilot plant test facility. This investigation is significant to the use of Illinois coal in that the limited research to da...

J. C. Crelling

1994-01-01

43

Reporting and Interpreting Test Results.  

ERIC Educational Resources Information Center

Tests and assessments are generally administered to gather data to aid in decision making, with at an individual student level or at an aggregated level. In order to incorporate assessment data in informed decision making, test users need to understand the test results. This chapter highlights the types of test scores and test score…

Harris, Deborah J.

44

An assessment of ore waste and dilution resulting from buffer\\/choke blasting in Surface Gold Mines  

Microsoft Academic Search

A discrete element computer program named DMC.BLAST (Distinct Motion Code) has been under development since 1987 for modeling rock blasting (Preece & Taylor 1989). This program employs explicit time integration and uses spherical or cylindrical elements that are represented as circles in two dimensions (2D). DMC.BLAST calculations compare favorably with data from actual bench blasts (Preece et al. 1993).Buffer\\/Choke blasting

Dale S. Preece; Stephen H. Chung; J. Paul Tidman

1998-01-01

45

MER ARA pyroshock test results  

NASA Technical Reports Server (NTRS)

This paper presents the shock test results achieved in the MER ARA/brush motor pyroshock qualification. The results of MER flight system pyrofiring tests in comparison with the ARA shock test requirements are discussed herein. Alternate test methods were developed in an effort to qualify the critical MER equipment for adequate performance in the actual flight pyroshock condition.

Chang, Kurng Y.

2004-01-01

46

LTC vacuum blasting machine (concrete): Baseline report  

SciTech Connect

The LTC shot blast technology was tested and is being evaluated at Florida International University (FIU) as a baseline technology. In conjunction with FIU`s evaluation of efficiency and cost, this report covers the evaluation conducted for safety and health issues. It is a commercially available technology and has been used for various projects at locations throughout the country. The LTC 1073 Vacuum Blasting Machine uses a high-capacity, direct-pressure blasting system which incorporates a continuous feed for the blast media. The blast media cleans the surface within the contained brush area of the blast. It incorporates a vacuum system which removes dust and debris from the surface as it is blasted. The safety and health evaluation during the testing demonstration focused on two main areas of exposure: dust and noise. Dust exposure during maintenance activities was minimal, but due to mechanical difficulties dust monitoring could not be conducted during operation. Noise exposure was significant. Further testing for each of these exposures is recommended because of the outdoor environment where the testing demonstration took place. This may cause the results to be inaccurate. It is feasible that the dust and noise levels will be higher in an enclosed environment. In addition, other safety and health issues found were ergonomics, heat stress, tripping hazards, electrical hazards, lockout/tagout, and arm-hand vibration.

NONE

1997-07-31

47

Detection algorithm and initial laboratory results usingV-BLAST space-time communication architecture  

Microsoft Academic Search

.System description: The V-BLAST system diagram is shown in Fig.1. QAM transmitters 1 to M operate co-channel at symbol rate 1\\/Tsymbol\\/s, with synchronised symbol timing. The collection of transmitterscomprises, in effect, a vector-valued transmitter, where componentsof each transmitted M-vector are symbols drawn from aQAM constellation. For simplicity in the sequel, we assume that thesame constellation is used for each component,

G. d. Golden; C. j. Foschini; R. a. Valenzuela; P. W. Wolniansky

1999-01-01

48

Fracture process in blasting  

Microsoft Academic Search

In order to clarify the respective roles of stress wave and gas pressure in the fragmentation of an underground blast the fracture process in the zone immediately around the borehole was studied by separating the 2 principal blast forces analytically and experimentally. In model tests the explosion wave was simulated by the pulse generated by an underwater spark discharge, and

H. K. Kutter; C. Fairhurst

1971-01-01

49

An Assessment of Ore Waste and Dilution Resulting From Buffer\\/Choke Blasting in Surface Gold Mines  

Microsoft Academic Search

A discrete element computer program named DMC{underscore}BLAST (Distinct Motion Code) has been under development since 1987 for modeling rock blasting (Preece & Taylor, 1989). This program employs explicit time integration and uses spherical or cylindrical elements that are represented as circles in two dimensions (2-D). DMC{underscore}BLAST calculations compare favorably with data from actual bench blasts (Preece et al, 1993). Buffer

D. S. Preece; S. H. Chung; J. P. Tidman

1997-01-01

50

Operation Teapot, Nevada Test Site, February-May 1955. Project 39. 4b. Technical photography (high speed-blast biology)  

Microsoft Academic Search

The purpose of this project was to provide the photographic requirements for Civil Effects Test Group projects concerned with the biological phenomena of blast. Preshot and postshot photographs were obtained of animals and\\/or structures. High-speed motion picture sequences of group-shelter interiors containing animals were attempted. Medical photographs of gross specimens were obtained at the time of autopsy of experimental animals.

M. A. Palmer; R. S. Harper

1955-01-01

51

Cookoff Test Models and Results  

Microsoft Academic Search

This paper described the laboratory tests performed to generate input data and the development and improvement of a computer\\u000a model to predict fast and slow cookoff test results. The kinetics parameters of a PBX, based in RDX, was obtained and their\\u000a results were used as input data in a computer model to predict ignition temperature and time-to-explosion. The results obtained

José Gois; F. Chaves; P. Simões; L. Pedroso; I. Plaksin; Ricardo Mendes; J. Ribeiro; Anónio Portugal; Jose Campos

52

Misleading biochemical laboratory test results  

PubMed Central

This article reviews the general and specific factors that interfere with the performance of common biochemical laboratory tests and the interpretation of their results. The clinical status of the patient, drug interactions, and in-vivo and in-vitro biochemical interactions and changes may alter the results obtained from biochemical analysis of blood constituents. Failure to recognize invalid laboratory test results may lead to injudicious and dangerous management of patients.

Nanji, Amin A.

1984-01-01

53

Effect of Loosening Techniques on the Product Quality in the Dimensional Stone Quarrying Industry. Part 1. Blasting Tests, Gabbro of Oulainen.  

National Technical Information Service (NTIS)

The Laboratory of Rock Engineering has undertaken research work for improving the quarrying methods of dimensional stone in cooperation with related industry since 1988. The methods have included test blasts in granite blocks either by splitting the block...

J. U. S. Jokinen K. K. Ylaetalo

1995-01-01

54

Single round blasting of 10-foot diameter X 65-foot depth emplacement collar holes at the Nevada Test Site  

SciTech Connect

Since 1961 REECo has drilled and mined emplacement holes for testing nuclear devices underground. An oversize drill pattern was the primary method used. The application of drilling the final size configuration hole to a 65-foot depth and mucking with the Auger Rig was then investigated. Numerous drilling patterns, loading and time schemes and methods were tried. Some were successful. Most were expensive. All concerned looked for a better and less costly method for this collar casing installation. Poor fragmentation in the collar holes prior to Atlas Powder becoming involved resulted in slow hole cleanout and excessive rig maintenance with associated excessive costs. One of the more successful shots was a 120-inch diameter {times} 60-foot deep hole that was drilled using 3 1/2-inch holes and then casing them to a 2-inch diameter using PVC pipe. A 30-inch burn hole was drilled to total depth. Twenty-seven 3 1/2-inch holes were drilled and then loaded with 1 1/2-inch powder boosted with Detaprimes and wired using all 0 delay caps. This shot smooth walled and the blast holes were visible all the way from top to bottom. Fragmentation was excellent and the Auger Rig mucked out quickly. The 28-inch bit used for the burn hole was a high cost item in this test and other methods continued to be investigated.

Not Available

1991-01-01

55

Variability of aflatoxin test results  

Microsoft Academic Search

Using 12 lb samples, 280 g subsamples, the Waltking method of analysis, and densitometric procedures, the sampling, subsampling,\\u000a and analytical variances associated with aflatoxin test procedures were estimated. Regression analysis indicated that each\\u000a of the above variance components is a function of the concentration of aflatoxin in the population being tested. Results,\\u000a for the test procedures given above, showed that

T. B. Whitaker; J. W. Dickens; R. J. Monroe

1974-01-01

56

Particulate Measurement - Motorcycle Test Results.  

National Technical Information Service (NTIS)

Particulate testing has been successfully completed on two different two-stroke powered motorcycles. The results indicate that the amount of particulate material produced by motorcycles is no greater than that from light-duty diesel automobiles. This conc...

E. Danielson

1978-01-01

57

Gunshot residue inserted under hair scales as a result of a muzzle blast  

NASA Astrophysics Data System (ADS)

The victim was alleged to have been shot in the head with a .40 caliber pistol from several feet. The defendant claimed that the shot was on the order of inches. Examination in the scanning electron microscope of the hair from around the victim's wound showed no adherent gunshot residue (GSR). However, when the hair was pulled apart by the adhesive of a standard GSR sampler, GSR was found associated with the exposed inner surfaces of the cuticle and cortex fragments. The pistol was discharged close enough to the victim's head that some of the cuticular scales were lifted in the muzzle blast which allowed GSR to be inserted under those scales. Gunshot residue associated with the surface of the victim's hair had somehow been removed. The defendant's account of the shooting was verified by the presence of under-scale GSR.

Burnett, Bryan R.

2009-05-01

58

An introductory characterization of a combat-casualty-care relevant swine model of closed head injury resulting from exposure to explosive blast.  

PubMed

Explosive blast has been extensively used as a tactical weapon in Operation Iraqi Freedom (OIF) and more recently in Operation Enduring Freedom(OEF). The polytraumatic nature of blast injuries is evidence of their effectiveness,and brain injury is a frequent and debilitating form of this trauma. In-theater clinical observations of brain-injured casualties have shown that edema, intracranial hemorrhage, and vasospasm are the most salient pathophysiological characteristics of blast injury to the brain. Unfortunately, little is known about exactly how an explosion produces these sequelae as well as others that are less well documented. Consequently, the principal objective of the current report is to present a swine model of explosive blast injury to the brain. This model was developed during Phase I of the DARPA (Defense Advanced Research Projects Agency) PREVENT (Preventing Violent Explosive Neurotrauma) blast research program. A second objective is to present data that illustrate the capabilities of this model to study the proximal biomechanical causes and the resulting pathophysiological, biochemical,neuropathological, and neurological consequences of explosive blast injury to the swine brain. In the concluding section of this article, the advantages and limitations of the model are considered, explosive and air-overpressure models are compared, and the physical properties of an explosion are identified that potentially contributed to the in-theater closed head injuries resulting from explosions of improvised explosive devices (IEDs). PMID:19215189

Bauman, Richard A; Ling, Geoffrey; Tong, Lawrence; Januszkiewicz, Adolph; Agoston, Dennis; Delanerolle, Nihal; Kim, Young; Ritzel, Dave; Bell, Randy; Ecklund, James; Armonda, Rocco; Bandak, Faris; Parks, Steven

2009-06-01

59

Blast furnace burden detector  

Microsoft Academic Search

A system for measuring the difference between coke and pellet layers in a blast furnace is described. The measurement is based on a high frequency magnetic proximity principle where coke, a conductor, causes a change in apparent coil resistance. Theoretical and experimental results are presented. The application of the system to No.5 Blast Furnace at Inland Steel (USA) is also

H. Gerber; P. Chaubal

1999-01-01

60

Toxicology of blast overpressure  

Microsoft Academic Search

Blast overpressure (BOP) or high energy impulse noise, is the sharp instantaneous rise in ambient atmospheric pressure resulting from explosive detonation or firing of weapons. Blasts that were once confined to military and to a lesser extent, occupational settings, are becoming more universal as the civilian population is now increasingly at risk of exposure to BOP from terrorist bombings that

Nabil M. Elsayed

1997-01-01

61

Mobile evaporator corrosion test results  

SciTech Connect

Laboratory corrosion tests were conducted on eight candidates to select a durable and cost-effective alloy for use in mobile evaporators to process radioactive waste solutions. Based on an extensive literature survey of corrosion data, three stainless steel alloys (304L, 316L, AL-6XN), four nickel-based alloys (825, 625, 690, G-30), and titanium were selected for testing. The corrosion tests included vapor phase, liquid junction (interface), liquid immersion, and crevice corrosion tests on plain and welded samples of candidate materials. Tests were conducted at 80{degrees}C for 45 days in two different test solutions: a nitric acid solution. to simulate evaporator conditions during the processing of the cesium ion-exchange eluant and a highly alkaline sodium hydroxide solution to simulate the composition of Tank 241-AW-101 during evaporation. All of the alloys exhibited excellent corrosion resistance in the alkaline test solution. Corrosion rates were very low and localized corrosion was not observed. Results from the nitric acid tests showed that only 316L stainless steel did not meet our performance criteria. The 316L welded interface and crevice specimens had rates of 22.2 mpy and 21.8 mpy, respectively, which exceeds the maximum corrosion rate of 20 mpy. The other welded samples had about the same corrosion resistance as the plain samples. None of the welded samples showed preferential weld or heat-affected zone (HAZ) attack. Vapor corrosion was negligible for all alloys. All of the alloys except 316L exhibited either {open_quotes}satisfactory{close_quotes} (2-20 mpy) or {open_quotes}excellent{close_quotes} (<2 mpy) corrosion resistance as defined by National Association of Corrosion Engineers. However, many of the alloys experienced intergranular corrosion in the nitric acid test solution, which could indicate a susceptibility to stress corrosion cracking (SCC) in this environment.

Rozeveld, A.; Chamberlain, D.B.

1997-05-01

62

Evaluation of copper slag blast media for railcar maintenance  

NASA Technical Reports Server (NTRS)

Copper slag was tested as a blasting substitute for zirconium silicate which is used to remove paint from railroad cars. The copper slag tested is less costly, strips paint faster, is produced near the point of need, provides a good bonding surface for paint, and permits the operator to work in a more comfortable position, i.e., standing nearly erect instead of having to crouch. Outdoor blasting with the tested Blackhawk (20 to 40 mesh) copper slag is also environmentally acceptable to the State of Utah. Results of tests for the surface erosion rate with copper slag blasting are included.

Sagers, N. W.; Finlayson, Mack H.

1989-01-01

63

Evolution of blast wave profiles in simulated air blasts: experiment and computational modeling  

NASA Astrophysics Data System (ADS)

Shock tubes have been extensively used in the study of blast traumatic brain injury due to increased incidence of blast-induced neurotrauma in Iraq and Afghanistan conflicts. One of the important aspects in these studies is how to best replicate the field conditions in the laboratory which relies on reproducing blast wave profiles. Evolution of the blast wave profiles along the length of the compression-driven air shock tube is studied using experiments and numerical simulations with emphasis on the shape and magnitude of pressure time profiles. In order to measure dynamic pressures of the blast, a series of sensors are mounted on a cylindrical specimen normal to the flow direction. Our results indicate that the blast wave loading is significantly different for locations inside and outside of the shock tube. Pressure profiles inside the shock tube follow the Friedlander waveform fairly well. Upon approaching exit of the shock tube, an expansion wave released from the shock tube edges significantly degrades the pressure profiles. For tests outside the shock tube, peak pressure and total impulse reduce drastically as we move away from the exit and majority of loading is in the form of subsonic jet wind. In addition, the planarity of the blast wave degrades as blast wave evolves three dimensionally. Numerical results visually and quantitatively confirm the presence of vortices, jet wind and three-dimensional expansion of the planar blast wave near the exit. Pressure profiles at 90° orientation show flow separation. When cylinder is placed inside, this flow separation is not sustained, but when placed outside the shock tube this flow separation is sustained which causes tensile loading on the sides of the cylinder. Friedlander waves formed due to field explosives in the intermediate-to far-field ranges are replicated in a narrow test region located deep inside the shock tube.

Chandra, N.; Ganpule, S.; Kleinschmit, N. N.; Feng, R.; Holmberg, A. D.; Sundaramurthy, A.; Selvan, V.; Alai, A.

2012-09-01

64

AXAF hypervelocity impact test results  

NASA Technical Reports Server (NTRS)

Composite and honeycomb panels are commonly used for spacecraft structural components. The impact test results and analysis of six different composite and honeycomb combinations for use on the advanced X-ray astrophysics facility (AXAF) are reported. The AXAF consists of an X-ray telescope and the associated detecting devices attached to an octagonal spacecraft with an internal propulsion system. The spacecraft's structural panels and optical bench are made of two different graphite fiber reinforced polyimides or composite panels bonded to either side of an aluminum honeycomb. The instrument is required to have at least a 0.92 probability of no failure of any of the critical elements due to meteoroids and debris. In relation to the no-failure probability determination in its low earth orbit environment, hypervelocity impact testing was performed to determine the ballistic limit range and the extent of damage due to impact. The test results for a power and signal cable bundle located behind a panel are presented. Tests planned for a multilayer insulation (MLI) blanket and four types of cable bundles are discussed.

Frost, Cynthia L.; Rodriguez, Pedro I.

1997-01-01

65

Blast Loading Experiments of Surrogate Models for Tbi Scenarios  

NASA Astrophysics Data System (ADS)

This study aims to characterize the interaction of explosive blast waves through simulated anatomical models. We have developed physical models and a systematic approach for testing traumatic brain injury (TBI) mechanisms and occurrences. A simplified series of models consisting of spherical PMMA shells housing synthetic gelatins as brain simulants have been utilized. A series of experiments was conducted to compare the sensitivity of the system response to mechanical properties of the simulants under high strain-rate explosive blasts. Small explosive charges were directed at the models to produce a realistic blast wave in a scaled laboratory test cell setting. Blast profiles were measured and analyzed to compare system response severity. High-speed shadowgraph imaging captured blast wave interaction with the head model while particle tracking captured internal response for displacement and strain correlation. The results suggest amplification of shock waves inside the head near material interfaces due to impedance mismatches. In addition, significant relative displacement was observed between the interacting materials suggesting large strain values of nearly 5%. Further quantitative results were obtained through shadowgraph imaging of the blasts confirming a separation of time scales between blast interaction and bulk movement. These results lead to the conclusion that primary blast effects could cause TBI occurrences.

Alley, M. D.; Son, S. F.

2009-12-01

66

Preliminary QCGAT program test results  

NASA Technical Reports Server (NTRS)

NASA Lewis Research Center is conducting a program to demonstrate that large commercial engine technology can be applied to general aviation engines to reduce noise, emissions and fuel consumption and to develop new technology where required. The overall engine program, design, and technology incorporated into the QCGAT engines are described. In addition, preliminary engine test results are presented and compared to the technical requirements the engines were designed to meet.

Koenig, R. W.; Sievers, G. K.

1979-01-01

67

Blast-wave characteristics near Site 300  

SciTech Connect

The blast-wave overpressures propagating in the atmosphere near the Lawrence Livermore National Laboratory (LLNL) Site 300 have been measured at selected locations to determine whether the Site 300 blast operations will be hindered by the proposed construction of a residential development adjacent to its border.We tested high-explosives (HE) weights ranging from 14 to 545 lb under various weather conditions. Although more tests should be conducted before a definitive statement can be made on the blast propagation near Site 300, we offer the following preliminary interpretation of the results obtained to date. The readings at the closest locations show that the blast-wave overpressures exceed the 126-decibel (dB) level established by LLNL at about 250 lb of HE detonation. The weather conditions do not materially affect the pressure levels at these locations. Insufficient test data exist along the Corral Hollow Road perimeter, making it difficult to reasonably predict HE blast effects along the southern border. Therefore, we recommend that additional measurements be made along this and other boundaries in future tests, to provide more comprehensive data to help determine the blast-wave propagation characteristics in the proposed development areas. Blast-wave focusing may occur in the proposed residential development area under certain weather conditions. We recommend that this possibility should be addressed for its potentially adverse impact on the proposed residential area. Because the testing ground controlled by Physics International, Inc. (PI) is adjacent to Site 300, it is important to be aware of PI`s detonation activities. Peak overpressure measurements near PI`s Corral Hollow Road entrance reveal that PI shots over 25 lb HE have exceeded 126 dB, the limit established by LLNL for safe operations.

Kang, Sang-Wook; Kleiber, J.C. Jr.

1993-08-01

68

ESF BLAST DESIGN ANALYSIS  

SciTech Connect

The purpose and objective of this design analysis are to develop controls considered necessary and sufficient to implement the requirements for the controlled drilling and blasting excavation of operations support alcoves and test support alcoves in the Exploratory Studies Facility (ESF). The conclusions reached in this analysis will flow down into a construction specification ensuring controlled drilling and blasting excavation will be performed within the bounds established here.

E.F. fitch

1995-03-13

69

RSG Deployment Case Testing Results  

SciTech Connect

The RSG deployment case design is centered on taking the RSG system and producing a transport case that houses the RSG in a safe and controlled manner for transport. The transport case was driven by two conflicting constraints, first that the case be as light as possible, and second that it meet a stringent list of Military Specified requirements. The design team worked to extract every bit of weight from the design while striving to meet the rigorous Mil-Spec constraints. In the end compromises were made primarily on the specification side to control the overall weight of the transport case. This report outlines the case testing results.

Owsley, Stanley L.; Dodson, Michael G.; Hatchell, Brian K.; Seim, Thomas A.; Alexander, David L.; Hawthorne, Woodrow T.

2005-09-01

70

30 CFR 75.1316 - Preparation before blasting.  

Code of Federal Regulations, 2010 CFR

...Tests shall be conducted using a blasting multimeter or other instrument...designed for such use. (3) The blasting cable or detonator circuitry...approaching each other, cutting, drilling and blasting shall be done at only one...

2010-07-01

71

30 CFR 75.1316 - Preparation before blasting.  

Code of Federal Regulations, 2010 CFR

...Tests shall be conducted using a blasting multimeter or other instrument...designed for such use. (3) The blasting cable or detonator circuitry...approaching each other, cutting, drilling and blasting shall be done at only one...

2009-07-01

72

30 CFR 75.1316 - Preparation before blasting.  

Code of Federal Regulations, 2010 CFR

...Tests shall be conducted using a blasting multimeter or other instrument...designed for such use. (3) The blasting cable or detonator circuitry...approaching each other, cutting, drilling and blasting shall be done at only one...

2012-07-01

73

30 CFR 75.1316 - Preparation before blasting.  

Code of Federal Regulations, 2010 CFR

...Tests shall be conducted using a blasting multimeter or other instrument...designed for such use. (3) The blasting cable or detonator circuitry...approaching each other, cutting, drilling and blasting shall be done at only one...

2011-07-01

74

Diagnostic Tests and Examination Results.  

ERIC Educational Resources Information Center

A study of the usefulness of several diagnostic tests for selecting students to enter a civil engineering program found that the tests were not appropriate and that tests should be developed specifically for civil engineering. (MSE)

Barker, Dennis

1988-01-01

75

Experimental modeling of explosive blast-related traumatic brain injuries.  

PubMed

This study aims to characterize the interaction of explosive blast waves through simulated anatomical systems. We have developed physical models and a systematic approach for testing traumatic brain injury (TBI) mechanisms and occurrences. A simplified series of models consisting of spherical poly(methyl methacrylate) (PMMA) shells housing synthetic gelatins as brain simulants have been utilized. A series of experiments was conducted to compare the sensitivity of the system response to mechanical properties of the simulants under high strain-rate explosive blasts. Small explosive charges were directed at the models to produce a realistic blast wave in a scaled laboratory setting. Blast profiles were measured and analyzed to compare system response severity. High-speed shadowgraph imaging captured blast wave interaction with the head model while particle tracking captured internal response for displacement and strain correlation. The results suggest amplification of shock waves inside the head near material interfaces due to impedance mismatches. In addition, significant relative displacement was observed between the interacting materials suggesting large strain values of nearly 5%. Further quantitative results were obtained through shadowgraph imaging of the blasts confirming a separation of time scales between blast interaction and bulk movement. These results lead to a conclusion that primary blast effects may potentially contribute significantly to the occurrence of military associated TBI. PMID:20580931

Alley, Matthew D; Schimizze, Benjamin R; Son, Steven F

2011-01-01

76

NCBI BLAST: a better web interface  

Microsoft Academic Search

Basic Local Alignment Search Tool (BLAST) is a sequence similarity search program. The public interface of BLAST, http:\\/\\/www.ncbi.nlm.nih.gov\\/ blast, at the NCBI website has recently been reengineered to improve usability and performance. Key new features include simplified search forms, improved navigation, a list of recent BLAST results, saved search strategies and a documentation directory. Here, we describe the BLAST web

Mark Johnson; Irena Zaretskaya; Yan Raytselis; Yuri Merezhuk; Scott Mcginnis; Thomas L. Madden

2008-01-01

77

Modeling coupled blast/structure interaction with Zapotec, benchmark calculations for the Conventional Weapon Effects Backfill (CONWEB) tests.  

SciTech Connect

Modeling the response of buried reinforced concrete structures subjected to close-in detonations of conventional high explosives poses a challenge for a number of reasons. Foremost, there is the potential for coupled interaction between the blast and structure. Coupling enters the problem whenever the structure deformation affects the stress state in the neighboring soil, which in turn, affects the loading on the structure. Additional challenges for numerical modeling include handling disparate degrees of material deformation encountered in the structure and surrounding soil, modeling the structure details (e.g., modeling the concrete with embedded reinforcement, jointed connections, etc.), providing adequate mesh resolution, and characterizing the soil response under blast loading. There are numerous numerical approaches for modeling this class of problem (e.g., coupled finite element/smooth particle hydrodynamics, arbitrary Lagrange-Eulerian methods, etc.). The focus of this work will be the use of a coupled Euler-Lagrange (CEL) solution approach. In particular, the development and application of a CEL capability within the Zapotec code is described. Zapotec links two production codes, CTH and Pronto3D. CTH, an Eulerian shock physics code, performs the Eulerian portion of the calculation, while Pronto3D, an explicit finite element code, performs the Lagrangian portion. The two codes are run concurrently with the appropriate portions of a problem solved on their respective computational domains. Zapotec handles the coupling between the two domains. The application of the CEL methodology within Zapotec for modeling coupled blast/structure interaction will be investigated by a series of benchmark calculations. These benchmarks rely on data from the Conventional Weapons Effects Backfill (CONWEB) test series. In these tests, a 15.4-lb pipe-encased C-4 charge was detonated in soil at a 5-foot standoff from a buried test structure. The test structure was composed of a reinforced concrete slab bolted to a reaction structure. Both the slab thickness and soil media were varied in the test series. The wealth of data obtained from these tests along with the variations in experimental setups provide ample opportunity to assess the robustness of the Zapotec CEL methodology.

Bessette, Gregory Carl

2004-09-01

78

Large blast and thermal simulator advanced concept driver design by computational fluid dynamics  

NASA Astrophysics Data System (ADS)

The construction of a large test facility is proposed for simulating the blast and thermal environment resulting from nuclear explosions. This facility would be used to test the survivability and vulnerability of military equipment such as trucks, tanks and helicopters in a simulated thermal and blast environment, and to perform research into nuclear blast phenomenology. The proposed advanced design concepts, heating of driver gas and fast-acting throat valves for wave shaping, are described and the results of CFD studies to advance these new technical concepts for simulating decaying blast waves are reported.

Opalka, Klaus O.

1989-08-01

79

SURFACE PREPARATION OF STEEL SUBSTRATES USING GRIT-BLASTING  

SciTech Connect

The primary purpose of grit blasting for thermal spray applications is to ensure a strong mechanical bond between the substrate and the coating by the enhanced roughening of the substrate material. This study presents statistically designed experiments that were accomplished to investigate the effect of abrasives on roughness for A36/1020 steel. The experiments were conducted using a Box statistical design of experiment (SDE) approach. Three grit blasting parameters and their effect on the resultant substrate roughness were investigated. These include blast media, blast pressure, and working distance. The substrates were characterized for roughness using surface profilometry. These attributes were correlated with the changes in operating parameters. Twin-Wire Electric Arc (TWEA) coatings of aluminum and zinc/aluminum were deposited on the grit-blasted substrates. These coatings were then tested for bond strength. Bond strength studies were conducted utilizing a portable adhesion tester following ASTM standard D4541.

Donna Post Guillen; D. J. Varacalle, Jr.; D. Deason; W. Rhodaberger; E. Sampson

2005-05-01

80

LTC vacuum blasting maching (concrete): Baseline report: Greenbook (Chapter)  

SciTech Connect

The LTC shot blast technology was tested and is being evaluated at Florida International University (FIU) as a baseline technology. In conjuction with FIU`s evaluation of efficiency and cost, this report covers the evaluation conducted for safety and health issues. It is a commercially available technology and has been used for various projects at locations throughout the country. The LTC 1073 Vacuum Blasting Machine uses a high-capacity, direct-pressure blasting system which incorporates a continuous feed for the blast media. The blast media cleans the surface within the contained brush area of the blast. It incorporates a vacuum system which removes dust and debris from the surface as it is blasted. The safety and health evaluation during the testing demonstration focused on two main areas of exposure: dust and noise. Dust exposure during maintenance activities was minimal, but due to mechanical difficulties dust monitoring could not be conducted during operation. Noise exposure was significant. Further testing for each of these exposures is recommended because of the outdoor environment where the testing demonstration took place. This may cause the results to be inaccurate. It is feasible that the dust and noise levels will be higher in an enclosed environment. In addition, other safety and health issues found were ergonomics, heat stress, tripping hazards, electrical hazards, lockout/tagout, and arm-hand vibration.

NONE

1997-07-31

81

Realistic warhead and blast shield testing of chemical energy tandem warhead systems for advanced antitank missiles  

Microsoft Academic Search

The results of dynamic sled track performance testing of advanced tandem configuration shaped-charge warheads against multiple-reactive-element tank armors are presented. Tandem configurations utilizing both currently fielded and experimental shaped-charge warheads were tested. Sled velocities used were between 400 and 1100 ft\\/s (Mach number 0.35 to 0.95), typical of the terminal approach velocity of TOW-type antitank missiles. High-speed motion pictures (5000

D. B. Fradkin; L. M. Hull; G. W. Laabs

1990-01-01

82

Determination of explosive blast loading equivalencies with an explosively driven shock tube  

SciTech Connect

Recently there has been significant interest in evaluating the potential of many different non-ideal energetic materials to cause blast damage. We present a method intended to quantitatively compare the blast loading generated by different energetic materials through use of an explosively driven shock tube. The test explosive is placed at the closed breech end of the tube and initiated with a booster charge. The resulting shock waves are then contained and focused by the tube walls to form a quasi-one-dimensional blast wave. Pressure transducers along the tube wall measure the blast overpressure versus distance from the source and allow the use of the one-dimensional blast scaling relationship to determine the energy deposited into the blast wave per unit mass of test explosive. These values are then compared for different explosives of interest and to other methods of equivalency determination.

Jackson, Scott I [Los Alamos National Laboratory; Hill, Larry G [Los Alamos National Laboratory; Morris, John S [Los Alamos National Laboratory

2009-01-01

83

Pilot-scale treatability testing -- Recycle, reuse, and disposal of materials from decontamination and decommissioning activities: Soda blasting demonstration  

SciTech Connect

The US Department of Energy (DOE) is in the process of defining the nature and magnitude of decontamination and decommissioning (D and D) obligations at its sites. With disposal costs rising and available storage facilities decreasing, DOE is exploring and implementing new waste minimizing D and D techniques. Technology demonstrations are being conducted by LMES at a DOE gaseous diffusion processing plant, the K-25 Site, in Oak Ridge, Tennessee. The gaseous diffusion process employed at Oak Ridge separated uranium-235 from uranium ore for use in atomic weapons and commercial reactors. These activities contaminated concrete and other surfaces within the plant with uranium, technetium, and other constituents. The objective of current K-25 D and D research is to make available cost-effective and energy-efficient techniques to advance remediation and waste management methods at the K-25 Site and other DOE sites. To support this objective, O`Brien and Gere tested a decontamination system on K-25 Site concrete and steel surfaces contaminated with radioactive and hazardous waste. A scouring system has been developed that removes fixed hazardous and radioactive surface contamination and minimizes residual waste. This system utilizes an abrasive sodium bicarbonate medium that is projected at contaminated surfaces. It mechanically removes surface contamination while leaving the surface intact. Blasting residuals are captured and dissolved in water and treated using physical/chemical processes. Pilot-scale testing of this soda blasting system and bench and pilot-scale treatment of the generated residuals were conducted from December 1993 to September 1994.

NONE

1995-08-01

84

Coupled rock motion and gas flow modeling in blasting.  

National Technical Information Service (NTIS)

The spherical element computer code DMC (Distinct Motion Code) used to model rock motion resulting from blasting has been enhanced to allow routine computer simulations of bench blasting. The enhancements required for bench blast simulation include: (1) m...

D. S. Preece S. D. Knudsen

1991-01-01

85

Therapeutic effect of sildenafil on blast-induced tinnitus and auditory impairment.  

PubMed

Blast-induced tinnitus, along with associated auditory impairment and traumatic brain injury, is a primary concern facing military service members. To search for treatment, we investigated the therapeutic effects of sildenafil, a phosphodiesterase-5 inhibitor, given its vasodilatory effects and evidence suggesting its beneficial effects on noise-induced hearing loss. Rats were subjected to three consecutive blast exposures at 22psi and were monitored for tinnitus using a gap-detection acoustic startle reflex paradigm. Hearing thresholds and detection were tested using auditory brainstem responses and prepulse inhibition, respectively. Blasted rats were either treated with sildenafil or tap water following blast exposure, while age-matched sham control rats were treated with sildenafil and no blast exposure. Our results showed that sildenafil did not effectively prevent acute tinnitus onset and hearing impairment. Instead, sildenafil significantly suppressed high-frequency tinnitus from 3 to 6weeks after blast exposure and reduced hearing impairment during the first week after blast exposure. Complex results were observed in the startle force data, where sildenafil-treated rats displayed significantly reduced startle force compared to the untreated blasted group, suggesting possible mitigation of traumatic brain injury and suppression of hyperacusis-like percepts. Taken together, sildenafil showed a therapeutic effect on blast-induced tinnitus and audiological impairment in a time-dependent manner. Other regimens such as higher dosage prior to blast exposure and combination with other treatments deserve further investigation to optimize the therapeutic effects. PMID:24662845

Mahmood, G; Mei, Z; Hojjat, H; Pace, E; Kallakuri, S; Zhang, J S

2014-06-01

86

Operation Greenhouse. Scientific Director's report of atomic weapon tests at Eniwetok, 1951. Annex 2. 9. Blast injuries in foxholes  

SciTech Connect

This experiment was conducted to gain information about the amount of protection from direct blast effects that may be provided by foxholes of uniform dimensions located within distances of a nuclear explosion that are recognized as lethal for combinations of thermal and ionzing radiations and indirect blast injuries. Sixteen dogs protected in foxholes were exposed in pairs to the nuclear detonation. Autopsies performed between 10 and 15 hours after the blast demonstrated mild to moderately severe lung hemorrhages and three instances of mild to moderately severe brain hemorrhage. Ruptured ear drums and blast damage to abdominal viscera were infrequent. Evidences of acute ionizing radiation injury consisted in decreases in absolute lymphocyte counts and changes in lymph nodes and spleens. Photographs and diagrams of foxholes, animals, and tissue speciments; graphs of blast pressures, gamma doses, and neutron fluxes are included.

Talbot, J.M.; Maupin, C.S.

1985-04-01

87

Results of experimental drilling and blasting operations in preparing the rock foundation of the Krapivinskii hydroelectric station  

Microsoft Academic Search

Conclusions 1.Experimental drilling and blasting operations on preparation of the rock foundation of the Krapivinskii hydrostation showed the possibility of replacing shothole by blasthole charges with parameters calculated by a special method. 2.The suitability of the method of calculating the parameters of DBOs with reduced blasthole charges developed earlier by Gidrospetsproekt, which provides preservation of the foundations of important structures

A. E. Azarkovich; V. N. Yanovskii

1984-01-01

88

The blast response of novel thermoplastic-based fibre-metal laminates – some preliminary results and observations  

Microsoft Academic Search

This paper investigates the blast response of fibre-metal laminates (FMLs) manufactured from two glass fibre reinforced polypropylene composites and that of a plain aluminium alloy. The FMLs were manufactured by stacking the materials in a mould and applying heat and pressure to them. An autoclave was not used. In this work, attention focuses on elucidating the failure modes in the

G. S. Langdon; W. J. Cantwell; G. N. Nurick

2005-01-01

89

Mechanical and histological characterization of trachea tissue subjected to blast-type pressures  

NASA Astrophysics Data System (ADS)

Injuries to the respiratory system can be a component of polytrauma in blast-loading injuries. Tissues located at air-liquid interfaces, including such tissues in the respiratory system, are particularly vulnerable to damage by blast overpressures. There is a lack of information about the mechanical and cellular responses that contribute to the damage of this class of tissues subjected to the high strain rates associated with blast loading. Here, we describe the results of dynamic blast-like pressure loading tests at high strain rates on freshly harvested ex vivo trachea tissue specimens.

Butler, B. J.; Bo, C.; Tucker, A. W.; Jardine, A. P.; Proud, W. G.; Williams, A.; Brown, K. A.

2014-05-01

90

Large Blast and Thermal Simulator Advanced Concept Driver Design by Computational Fluid Dynamics.  

National Technical Information Service (NTIS)

The construction of a large test facility has been proposed for simulating the blast and thermal environment resulting from nuclear explosions. This facility would be used to test the survivability and vulnerability of military equipment such as trucks, t...

K. O. Opalka

1989-01-01

91

The response of fibre metal laminate panels subjected to uniformly distributed blast loading  

Microsoft Academic Search

This paper presents the results of blast loading tests on fully clamped square fibre metal laminate (FML) panels. The FMLs were constructed from aluminium alloy, a polypropylene interlayer and co-mingled glass fibre\\/polypropylene woven cloth. The spatial loading distribution is approximated as uniform and was generated by detonating annuli of explosive. Observations from blast experiments performed on panels with different stacking

G. S. Langdon; G. N. Nurick; W. J. Cantwell

2008-01-01

92

Summary of Blast Shield and Material Testing for Development of Solid Debris Collection at the National Ignition Facility (NIF)  

SciTech Connect

The ability to collect solid debris from the target chamber following a NIF shot has application for both capsule diagnostics, particularly for fuel-ablator mix, and measuring cross sections relevant to the Stockpile Stewardship program and nuclear astrophysics. Simulations have shown that doping the capsule with up to 10{sup 15} atoms of an impurity not otherwise found in the capsule does not affect its performance. The dopant is an element that will undergo nuclear activations during the NIF implosion, forming radioactive species that can be collected and measured after extraction from the target chamber. For diagnostics, deuteron or alpha induced reactions can be used to probe the fuel-ablator mix. For measuring neutron cross sections, the dopant should be something that is sensitive to the 14 MeV neutrons produced through the fusion of deuterium and tritium. Developing the collector is a challenge due to the extreme environment of the NIF chamber. The collector surface is exposed to a large photon flux from x-rays and unconverted laser light before it is exposed to a debris wind that is formed from vaporized material from the target chamber center. The photons will ablate the collector surface to some extent, possibly impeding the debris from reaching the collector and sticking. In addition, the collector itself must be mechanically strong enough to withstand the large amount of energy it will be exposed to, and it should be something that will be easy to count and chemically process. In order to select the best material for the collector, a variety of different metals have been tested in the NIF chamber. They were exposed to high-energy laser shots in order to evaluate their postshot surface characterization, morphology, degree of melt, and their ability to retain debris from the chamber center. The first set of samples consisted of 1 mm thick pieces of aluminum that had been fielded in the chamber as blast shields protecting the neutron activation diagnostic. Ten of these pieces were fielded at the equator and one was fielded on the pole. The shields were analyzed using a combination of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), x-ray fluorescence (XRF), neutron activation analysis (NAA) and chemical leaching followed by mass spectrometry. On each shield, gold debris originating from the gold hohlraum was observed, as well as large quantities of debris that were present in the center of the target chamber at the time of the shot (i.e., stainless steel, indium, copper, etc.) Debris was visible in the SEM as large blobs or splats of material that had encountered the surface of the aluminum and stuck. The aluminum itself had obviously melted and condensed, and some of the large debris splats arrived after the surface had already hardened. Melt depth was determined by cross sectioning the pieces and measuring the melted surface layers via SEM. After the SEM analysis was completed, the pieces were sent for NAA at the USGS reactor and were analyzed by U. Greife at the Colorado School of Mines. The NAA showed that the majority of gold mass present on the shields was not in the form of large blobs and splats, but was present as small particulates that had most likely formed as condensed vapor. Further analysis showed that the gold was entrained in the melted aluminum surface layers and did not extend down into the bulk of the aluminum. Once the gold mass was accounted for from the NAA, it was determined that the aluminum fielded at the equator was collecting a fraction of the total gold hohlraum mass equivalent to 120% {+-} 10% of the solid angle subtended by the shield. The attached presentation has more information on the results of the aluminum blast shield analysis. In addition to the information given in the presentation, the surfaces of the shields have been chemically leached and submitted for mass spectrometric analysis. The results from that analysis are expected to arrive after the due date of this report and will be written up at a later time. Based on the results of the aluminum b

Shaughnessy, D A; Gostic, J M; Moody, K J; Grant, P M; Lewis, L A; Hutcheon, I D

2011-11-21

93

Large blast and thermal simulator advanced concept driver design by computational fluid dynamics. Final report, 1987-1989  

SciTech Connect

The construction of a large test facility has been proposed for simulating the blast and thermal environment resulting from nuclear explosions. This facility would be used to test the survivability and vulnerability of military equipment such as trucks, tanks, and helicopters in a simulated thermal and blast environment, and to perform research into nuclear blast phenomenology. The proposed advanced design concepts, heating of driver gas and fast-acting throat valves for wave shaping, are described and the results of CFD studies to advance these new technical concepts fro simulating decaying blast waves are reported.

Opalka, K.O.

1989-08-01

94

Blast load assessment using hydrocodes  

Microsoft Academic Search

The evaluation of pressures and impulses produced by blast loads with the aid of hydrocodes is studied in this paper. Numerical results are compared with those obtained with existing analytical expressions for different scaled distances and boundary conditions. In particular, the capacity of both methods to capture multiple reflections of the blast load is analyzed. The effects of mesh size

B. Luccioni; D. Ambrosini; R. Danesi

2006-01-01

95

Characterizing the Relationship Between Blast Exposure and Mild TBI with Dynamic Modeling and Testing in a New Mouse Model.  

National Technical Information Service (NTIS)

The purpose of this research is to determine through analytical modeling and animal-based experiments the blast-level threshold for mild traumatic brain injury in humans. We have cataloged brain material properties and determined microtubule geometry and ...

C. L. Floyd J. W. Shepard

2011-01-01

96

BLAST: improvements for better sequence analysis  

Microsoft Academic Search

Basic local alignment search tool (BLAST) is a sequence similarity search program. The National Center for Biotechnology Information (NCBI) main- tains a BLAST server with a home page at http:\\/\\/ www.ncbi.nlm.nih.gov\\/BLAST\\/. We report here on recent enhancements to the results produced by the BLAST server at the NCBI. These include features to highlight mismatches between similar sequences, showwherethequerywasmaskedforlow-complexity sequence, and

Jian Ye; Scott Mcginnis; Thomas L. Madden

2006-01-01

97

Simulation of Blast Waves with Headwind  

NASA Technical Reports Server (NTRS)

The blast wave resulting from an explosion was simulated to provide guidance for models estimating risks for human spacecraft flight. Simulations included effects of headwind on blast propagation, Blasts were modelled as an initial value problem with a uniform high energy sphere expanding into an ambient field. Both still air and cases with headwind were calculated.

Olsen, Michael E.; Lawrence, Scott W.; Klopfer, Goetz H.; Mathias, Dovan; Onufer, Jeff T.

2005-01-01

98

Characterization of viscoelastic materials for low-magnitude blast mitigation  

NASA Astrophysics Data System (ADS)

Recent research indicates that exposure to low amplitude blast waves, such as IED detonation or multiple firings of a weapon, causes damage to brain tissue resulting in Traumatic Brain Injury (TBI) and Post Traumatic Stress Disorder (PTSD). Current combat helmets are not sufficiently protecting warfighters from this danger and the effects are debilitating, costly, and long-lasting. The objective of the present work is to evaluate the blast mitigating behavior of current helmet materials and new materials designed for blast mitigation using a test fixture recently developed at the Naval Surface Warfare Center Dahlgren Division for use with an existing gas gun. The 40-mm-bore gas gun was used as a shock tube to generate blast waves (ranging from 0.5 to 2 bar) in the test fixture mounted on the gun muzzle. A fast opening valve was used to release helium gas from the breech which formed into a blast wave and impacted instrumented targets in the test fixture. Blast attenuation of selected materials was determined through the measurement of stress data in front of and behind the target. Materials evaluated in this research include polyurethane foam from currently fielded US Army and Marine Corps helmets, polyurea 1000, and three hardnesses of Sorbothane (48, 58, and 70 durometer, Shore 00). Polyurea 1000 and 6061-T6 aluminum were used to calibrate the stress gauges.

Bartyczak, S.; Mock, W.

2014-05-01

99

Blasting: Another environmental woe  

NASA Astrophysics Data System (ADS)

The much increased use of explosives to move and extract rock masses in construction and mining over the past two decades has resulted in a plethora of complaints from the general public in areas of close proximity to public facilities, communication, and transportation systems. Air blasts and ground vibrations caused by explosive detonation can have desultory and damaging effects to public and private property, impose adverse effects on underground mining operations, and change the course of flow or effect the availability of surface and groundwater. Attempts to prevent damage and alleviate problems from blasting have been initiated by the federal and state governments by the promulgation of rules and regulations to prevent against vagrant and negligent blasting procedures. The Office of Surface Mining, Reclamation and Enforcement (OSMRE) provided regulations in the Federal Register on March 8, 1983, with particular reference to surface mining practices. Most of the states have adopted the OSMRE guidelines to enforce these rules and regulations.

Simpson, Thomas A.

1989-03-01

100

Recent radiation test results at JPL  

Microsoft Academic Search

This paper documents recent TID (including ELDRS) and proton damage test results obtained by JPL. Unusual test results, such as abnormally low or high failure levels or unusual failure or response mechanisms, are emphasized.

Bruce E. Pritchard; Bernard G. Rax; Steven S. McClure

2003-01-01

101

Thermal Nuclear Blast Simulation at the National Solar Thermal Test Facility.  

National Technical Information Service (NTIS)

The National Solar Thermal Test Facility is operated by Sandia National Laboratories and located on Kirtland Air Force Base in Albuquerque, New Mexico. The facility includes a heliostat field and associated receiver tower, two solar furnaces, and two poin...

C. P. Cameron C. M. Ghanbari

1989-01-01

102

Blast injury.  

PubMed

The shock wave generated by an explosion ("blast wave") may cause injury in any or all of the following: (1) direct impact on the tissues of variations in environmental pressure; (2) flying glass and other debris set in motion by it; (3) propulsion of the body. Injuries in the first category affect gas-containing organs (ears, lungs and intestines), and acute death is attributed to air forced into the coronary vessels via damaged pulmonary alveoli. It is estimated that overpressure sufficient to cause lung injury may occur up to five miles from a 20-megaton nuclear explosion. The greatest single hazard from blast is, however, flying glass, and serious wounding from this cause is possible up to 12 miles from an explosion of this magnitude. PMID:6015742

de Candole, C A

1967-01-28

103

On the Propagation and Interaction of Spherical Blast Waves  

NASA Technical Reports Server (NTRS)

The characteristics and the scaling laws of isolated spherical blast waves have been briefly reviewed. Both self-similar solutions and numerical solutions of isolated blast waves are discussed. Blast profiles in the near-field (strong shock region) and the far-field (weak shock region) are examined. Particular attention is directed at the blast overpressure and shock propagating speed. Consideration is also given to the interaction of spherical blast waves. Test data for the propagation and interaction of spherical blast waves emanating from explosives placed in the vicinity of a solid propellant stack are presented. These data are discussed with regard to the scaling laws concerning the decay of blast overpressure.

Kandula, Max; Freeman, Robert

2007-01-01

104

Heavy ion test results on memories  

Microsoft Academic Search

A synthesis is presented of heavy ion single event upset and latch-up sensitivity test results on 12 memory types from various technologies. Test data for CMOS and SOI SRAMs, FG\\/EEPROMs and SNOS\\/EEPROMs are presented. After a presentation of the test conditions, the interpretation of the results for high density technologies are discussed. The test results are then summarized and discussed

R. Ecoffet; M. Labrunee; S. Duzellier; D. Falguere

1992-01-01

105

Blast Analysis and Design of Rocket Engine Test Facility Control Rooms.  

National Technical Information Service (NTIS)

In support of plans to add a second control room to the Rocket Engine Test Facility at NASA, Cleveland, OH, the existing control room was analyzed to determine the most severe accidental explosion it could safely withstand. This potential accident was use...

R. C. Dove S. A. Kiger

1986-01-01

106

Blasting Injuries in Surface Mining with Emphasis on Flyrock and Blast Area Security.  

National Technical Information Service (NTIS)

Blasting is a hazardous component of surface mining. Serious injuries and fatalities result from improper judgement or practice during rock blasting. This paper describes several fatal injury case studies, analyzes causative factors, and emphasizes preven...

D. K. Ingram G. L. Mowrey T. R. Rehak T. S. Bajpayee

2008-01-01

107

Operation GREENHOUSE. Scientific Director's Report of Atomic Weapon Tests at Eniwetok, 1951. Annex 4.2. Measurement of Surface-Air Movements Associated with Atomic Blasts.  

National Technical Information Service (NTIS)

The purpose of this project was to record continuous measurements of the surface winds in the vicinity of an atomic blast immediately prior to the blast, during passage of the shock wave, and immediately after the blast with special regard to the blast-in...

R. M. Rados J. C. Bogert T. O. Haig

1985-01-01

108

PHASE I SINGLE CELL ELECTROLYZER TEST RESULTS  

Microsoft Academic Search

This document reports the results of Phase I Single Cell testing of an SO-Depolarized Water Electrolyzer. Testing was performed primarily during the first quarter of FY 2008 at the Savannah River National Laboratory (SRNL) using an electrolyzer cell designed and built at SRNL. Other facility hardware were also designed and built at SRNL. This test further advances this technology for

J Steimke; T Timothy Steeper

2008-01-01

109

MIT 12 Tesla Coil test results  

Microsoft Academic Search

Test results from the MIT 12 Tesla Coil experiment are presented. The coil was tested in the High Field Test Facility (HFTF) of the Lawrence Livermore National Laboratory in October 1984 and January 1985. The experiment measured the performance of an Internally Cooled, Cabled Superconductor (ICCS) of practical size, intended for use in magnetic fusion experiments. The MIT coil carried

M. M. Steeves; M. O. Hoenig

1985-01-01

110

Monitoring and Testing the Parts Cleaning Stations, Abrasive Blasting Cabinets, and Paint Booths  

NASA Technical Reports Server (NTRS)

I have the opportunity to work in the Environmental Management Office (EMO) this summer. One of the EMO's tasks is to make sure the Environmental Management System is implemented to the entire Glenn Research Center (GRC). The Environmental Management System (EMS) is a policy or plan that is oriented toward minimizing an organization's impact to the environment. Our EMS includes the reduction of solid waste regeneration and the reduction of hazardous material use, waste, and pollution. With the Waste Management Team's (WMT) help, the EMS can be implemented throughout the NASA Glenn Research Center. The WMT is responsible for the disposal and managing of waste throughout the GRC. They are also responsible for the management of all chemical waste in the facility. My responsibility is to support the waste management team by performing an inventory on parts cleaning stations, abrasive cabinets, and paint booths through out the entire facility. These booths/stations are used throughout the center and they need to be monitored and tested for hazardous waste and material. My job is to visit each of these booths/stations, take samples of the waste, and analyze the samples.

Jordan, Tracee M.

2004-01-01

111

Explosive signatures: Pre & post blast  

NASA Astrophysics Data System (ADS)

Manuscripts 1 and 2 of this dissertation both involve the pre-blast detection of trace explosive material. The first manuscript explores the analysis of human hair as an indicator of exposure to explosives. Field analysis of hair for trace explosives is quick and non-invasive, and could prove to be a powerful linkage to physical evidence in the form of bulk explosive material. Individuals tested were involved in studies which required handling or close proximity to bulk high explosives such as TNT, PETN, and RDX. The second manuscript reports the results of research in the design and application of canine training aids for non-traditional, peroxide-based explosives. Organic peroxides such as triacetonetriperoxide (TATP) and hexamethylenetriperoxidediamine (HMTD) can be synthesized relatively easily with store-bought ingredients and have become popular improvised explosives with many terrorist groups. Due to the hazards of handling such sensitive compounds, this research established methods for preparing training aids which contained safe quantities of TATP and HMTD for use in imprinting canines with their characteristic odor. Manuscripts 3 and 4 of this dissertation focus on research conducted to characterize pipe bombs during and after an explosion (post-blast). Pipe bombs represent a large percentage of domestic devices encountered by law enforcement. The current project has involved the preparation and controlled explosion of over 90 pipe bombs of different configurations in order to obtain data on fragmentation patterns, fragment velocity, blast overpressure, and fragmentation distance. Physical data recorded from the collected fragments, such as mass, size, and thickness, was correlated with the relative power of the initial device. Manuscript 4 explores the microstructural analysis of select pipe bomb fragments. Shock-loading of the pipe steel led to plastic deformation and work hardening in the steel grain structure as evidenced by optical microscopy and microhardness testing respectively.

Bernier, Evan Thomas

112

Reproducibility of liquid oxygen impact test results  

NASA Technical Reports Server (NTRS)

Results for 12,000 impacts on a wide range of materials were studied to determine the reproducibility of the liquid oxygen impact test method. Standard deviations representing the overall variability of results were in close agreement with the expected values for a binomial process. This indicates that the major source of variability is due to the go - no go nature of the test method and that variations due to sampling and testing operations were not significant.

Gayle, J. B.

1975-01-01

113

Pilot plant testing of Illinois coal for blast furnace injection. Quarterly report, 1 December 1994--28 February 1995.  

National Technical Information Service (NTIS)

A potentially new use for Illinois coal is its use as a fuel injected into a blast furnace to produce molten iron as the first step in steel production. Because of its increasing cost and decreasing availability, metallurgical coke is now being replaced b...

J. C. Crelling

1995-01-01

114

Modeling coupled blast\\/structure interaction with Zapotec, benchmark calculations for the Conventional Weapon Effects Backfill (CONWEB) tests  

Microsoft Academic Search

Modeling the response of buried reinforced concrete structures subjected to close-in detonations of conventional high explosives poses a challenge for a number of reasons. Foremost, there is the potential for coupled interaction between the blast and structure. Coupling enters the problem whenever the structure deformation affects the stress state in the neighboring soil, which in turn, affects the loading on

Bessette; Gregory Carl

2004-01-01

115

Review of Fenton Hill HDR test results  

SciTech Connect

Results of recent flow testing at Fenton Hill, New Mexico, have been examined in light of their applicability to the development of commercial-scale hot dry rock (HDR) reservoirs at other sites. These test results, obtained during the cumulative 11 months of reservoir flow testing between 1992 and 1995, show that there was no significant production temperature drawdown during this time and that the reservoir flow became more dispersed as flow testing proceeded. Based on these test results together with previous HDR research at Fenton Hill and elsewhere, it is concluded that a three-well geometry, with one centrally located injection well and two production wells-one at each end of the pressure-stimulated reservoir region-would provide a much more productive system for future HDR development than the two-well system tested at Fenton Hill.

Brown, D.

1997-01-01

116

Superconducting solenoid model magnet test results  

SciTech Connect

Superconducting solenoid magnets suitable for the room temperature front end of the Fermilab High Intensity Neutrino Source (formerly known as Proton Driver), an 8 GeV superconducting H- linac, have been designed and fabricated at Fermilab, and tested in the Fermilab Magnet Test Facility. We report here results of studies on the first model magnets in this program, including the mechanical properties during fabrication and testing in liquid helium at 4.2 K, quench performance, and magnetic field measurements. We also describe new test facility systems and instrumentation that have been developed to accomplish these tests.

Carcagno, R.; Dimarco, J.; Feher, S.; Ginsburg, C.M.; Hess, C.; Kashikhin, V.V.; Orris, D.F.; Pischalnikov, Y.; Sylvester, C.; Tartaglia, M.A.; Terechkine, I.; /Fermilab

2006-08-01

117

Alternative filtration testing program: Pre-evaluation of test results  

SciTech Connect

Based on results of testing eight solids removal technologies and one pretreatment option, it is recommended that a centrifugal ultrafilter and polymeric ultrafilter undergo further testing as possible alternatives to the Norton Ceramic filters. Deep bed filtration should be considered as a third alternative, if a backwashable cartridge filter is shown to be inefficient in separate testing.

Georgeton, G.K.; Poirier, M.R.

1990-09-28

118

Development of a finite element model for blast brain injury and the effects of CSF cavitation.  

PubMed

Blast-related traumatic brain injury is the most prevalent injury for combat personnel seen in the current conflicts in Iraq and Afghanistan, yet as a research community,we still do not fully understand the detailed etiology and pathology of this injury. Finite element (FE) modeling is well suited for studying the mechanical response of the head and brain to blast loading. This paper details the development of a FE head and brain model for blast simulation by examining both the dilatational and deviatoric response of the brain as potential injury mechanisms. The levels of blast exposure simulated ranged from 50 to 1000 kPa peak incident overpressure and 1–8 ms in positive-phase duration, and were comparable to real-world blast events. The frontal portion of the brain had the highest pressures corresponding to the location of initial impact, and peak pressure attenuated by 40–60% as the wave propagated from the frontal to the occipital lobe. Predicted brain pressures were primarily dependent on the peak overpressure of the impinging blast wave, and the highest predicted brain pressures were 30%less than the reflected pressure at the surface of blast impact. Predicted shear strain was highest at the interface between the brain and the CSF. Strain magnitude was largely dependent on the impulse of the blast, and primarily caused by the radial coupling between the brain and deforming skull.The largest predicted strains were generally less than 10%,and occurred after the shock wave passed through the head.For blasts with high impulses, CSF cavitation had a large role in increasing strain levels in the cerebral cortex and periventricular tissues by decoupling the brain from the skull. Relating the results of this study with recent experimental blast testing suggest that a rate-dependent strain-based tissue injury mechanism is the source primary blast TBI. PMID:22298329

Panzer, Matthew B; Myers, Barry S; Capehart, Bruce P; Bass, Cameron R

2012-07-01

119

Shock sensitivity of blasting explosive cartridges  

Microsoft Academic Search

The undersand variable gap–initiator test was applied to most Japanese blasting explosive cartridges and found useful as the sensitivity test for the cartridges. The recent Japanese watergel and emulsion explosives were shown to be more shock–sensitive than previous ones. The blast noise in the undersand explosion was shown to decrease when the depth of sand cover the cartridge was increased.

Yuji Wada; Hideo Yabashi; Masamitsu Tamura; Tadao Yoshida; Toshio Matsuzawa; Fumio Hosoya

1991-01-01

120

Preliminary silver-hydrogen cell test results  

NASA Technical Reports Server (NTRS)

Silver-hydrogen cells were tested. The objective of the test was to estimate useful life by operation at accelerated, simulated geosynchronous orbit conditions. Ten simulated seasons were run and are summarized. The results to-date reflect stable, trouble-free performance and indicate that the silver-hydrogen couple shows promise as a lightweight alternative to the nickel systems.

Lurie, C.

1984-01-01

121

Test Results Untrustworthy. Point of View Essay  

ERIC Educational Resources Information Center

America's public schools are making harmful, irreversible decisions based on test results that--in an increasing number of cases--can't be trusted, Arizona State University's Education Policy Research Laboratory has found. The pressure of high-stakes tests is forcing school districts and state Departments of Education to take inappropriate and at…

Berliner, David C.; Nichols, Sharon L.

2005-01-01

122

EAVE-East Field Test Results  

Microsoft Academic Search

EAVE-East is an untethered autonomous submersible being developed by the Marine systems Engineering Laboratory (MSEL) at the University of New Hampshire. The submersible underwent intensive development testing during the summer and fall of 1983. Results of these tests will be presented to specifically address the following: 1. Vehicle navigation capability; 2. Vehicle controllability; 3. Mass data storage and retrieval. The

J. Jalbert

1984-01-01

123

XG Dynamic Spectrum Sharing Field Test Results  

Microsoft Academic Search

This paper describes the results of field testing of the XG Radio system. In August 2006, the XG Radio system was field tested at Fort A.P. Hill, Virginia, in the laboratory, and at field locations in Northern Virginia. The XG Radio system uses dynamic spectrum sharing technology to determine locally unused spectrum, and then operates on these channels without causing

M. McHenry; E. Livsics; Thao Nguyen; N. Majumdar

2007-01-01

124

Conventional Anchor Test Results at Guam.  

National Technical Information Service (NTIS)

The results of instrumented drag embedment anchor tests in Inner Apra Harbor, Guam are presented. The Navy can use this data for selecting and sizing anchors for Guam as well as other similar sites. Test data for the Navy STOCKLESS and STATO anchors are p...

R. J. Taylor K. Rocker

1980-01-01

125

Mine Roof Vibrations from Production Blasts, Shullsburg Mine, Shullsburg, Wis.  

National Technical Information Service (NTIS)

The Bureau of Mines recorded both particle accelerations and velocities from one-stick and production blasts at Eagle-Picher Industries' Shullsburg mine, Shullsburg, Wis., to test the effectiveness of square root scaling in grouping underground blast vibr...

D. E. Fogelson J. J. Olson L. R. Fletcher R. A. Dick

1970-01-01

126

Results of the HESSI Test Mishap Investigation  

NASA Technical Reports Server (NTRS)

On March 21, 2000, the High-Energy Solar Spectroscopic Imager (HESSI) spacecraft was subjected to a series of vibration tests at the Jet Propulsion Laboratory (JPL) as a part of its flight certification program. The structural qualification test, denoted as the sineburst test, subjected the spacecraft to a major overtest that resulted in significant structural damage to the spacecraft. The HESSI Test Mishap Investigation Board (MIB) was formed on March 24, 2000, in response to a NASA headquarters request. Board membership included experts from NASA and the University of California at Berkeley. This paper will present the investigation methods, findings, and lessons learned from the HESSI mishap.

Worth, Daniel B.; Phillips, Rodney N.; Kross, Dennis A. (Technical Monitor)

2000-01-01

127

Low Emissions RQL Flametube Combustor Test Results  

NASA Technical Reports Server (NTRS)

The overall objective of this test program was to demonstrate and evaluate the capability of the Rich-burn/Quick-mix/Lean-burn (RQL) combustor concept for HSR applications. This test program was in support of the Pratt & Whitney and GE Aircraft Engines HSR low-NOx Combustor Program. Collaborative programs with Parker Hannifin Corporation and Textron Fuel Systems resulted in the development and testing of the high-flow low-NOx rich-burn zone fuel-to-air ratio research fuel nozzles used in this test program. Based on the results obtained in this test program, several conclusions can be made: (1) The RQL tests gave low NOx and CO emissions results at conditions corresponding to HSR cruise. (2) The Textron fuel nozzle design with optimal multiple partitioning of fuel and air circuits shows potential of providing an acceptable uniform local fuel-rich region in the rich burner. (3) For the parameters studied in this test series, the tests have shown T3 is the dominant factor in the NOx formation for RQL combustors. As T3 increases from 600 to 1100 F, EI(NOx) increases approximately three fold. (4) Factors which appear to have secondary influence on NOx formation are P4, T4, infinity(sub rb), V(sub ref,ov). (5) Low smoke numbers were measured for infinity(sub rb) of 2.0 at P4 of 120 psia.

Chang, Clarence T.; Holdeman, James D.

2001-01-01

128

The Potential for Unifying Drilling, Blasting and Downstream Operations by the Application of Technology  

Microsoft Academic Search

In this paper, a number of technologies that can favorably impact drilling and blasting are presented. These advances can provide a way to unify drilling, blasting and blast design. Other technologies are discussed that provide ways to quantitatively assess blasting results throughout the mining system. These can provide feedback loops to drilling and blasting. The possibility of setting quantitative fragmentation

Lyall Workman

129

Punch valve development testing: Low and high velocity test results  

SciTech Connect

This is a report on the use of quasi-static tests to predict fundamental parameters for punch valve development. This report summarizes the results from low and high velocity tests performed with 0.63 and 0.38 cm diameter plungers, 5 cm long penetrating aluminium and composite targets. The low velocity tests, 0.025 m/s, were performed to understand the effects and interactions of plunger diameter plunger tip shape, target material, and target support on penetration energy and plunger functionality. High velocity tests, 75 m/s, were compared to low velocity results.

Replogle, W.C.; Brandon, S.L.

1996-09-01

130

Adaptive structures - Test hardware and experimental results  

NASA Technical Reports Server (NTRS)

The facilities and procedures used at JPL to test adaptive structures such as the large deployable reflector (LDR) are described and preliminary results are reported. The applications of adaptive structures in future NASA missions are outlined, and the techniques which are employed to modify damping, stiffness, and isolation characteristics, as well as geometric changes, are listed. The development of adaptive structures is shown to be effective as a result of new actuators and sensors, and examples are listed for categories such as fiber optics, shape-memory materials, piezoelectrics, and electrorheological fluids. Some ground test results are described for laboratory truss structures and truss test beds, which are shown to be efficient and easy to assemble in space. Adaptive structures are shown to be important for precision space structures such as the LDR, and can alleviate ground test requirements.

Wada, Ben K.; Fanson, James L.; Chen, Gun-Shing; Kuo, Chin-Po

1990-01-01

131

NEXT Single String Integration Test Results  

NASA Technical Reports Server (NTRS)

As a critical part of NASA's Evolutionary Xenon Thruster (NEXT) test validation process, a single string integration test was performed on the NEXT ion propulsion system. The objectives of this test were to verify that an integrated system of major NEXT ion propulsion system elements meets project requirements, to demonstrate that the integrated system is functional across the entire power processor and xenon propellant management system input ranges, and to demonstrate to potential users that the NEXT propulsion system is ready for transition to flight. Propulsion system elements included in this system integration test were an engineering model ion thruster, an engineering model propellant management system, an engineering model power processor unit, and a digital control interface unit simulator that acted as a test console. Project requirements that were verified during this system integration test included individual element requirements ; integrated system requirements, and fault handling. This paper will present the results of these tests, which include: integrated ion propulsion system demonstrations of performance, functionality and fault handling; a thruster re-performance acceptance test to establish baseline performance: a risk-reduction PMS-thruster integration test: and propellant management system calibration checks.

Soulas, George C.; Patterson, Michael J.; Pinero, Luis; Herman, Daniel A.; Snyder, Steven John

2010-01-01

132

Sequential Circuit Test Generator (STG) benchmark results  

Microsoft Academic Search

The authors report on the results of running a version of the Sequential Circuit Test Generator (STG3) on the ISCAS-89 sequential circuit benchmarks. First, they present a brief history of STG and briefly describe the algorithms used. They then describe the conditions under which the experiments were run and give the benchmark results. No particular problems were encountered when running

W.-T. Cheng; S. Davidson

1989-01-01

133

Phenotypic screening and molecular analysis of blast resistance in fragrant rice for marker assisted selection.  

PubMed

Experiments were conducted to identify blast-resistant fragrant genotypes for the development of a durable blast-resistant rice variety during years 2012-2013. The results indicate that out of 140 test materials including 114 fragrant germplasms, 25 differential varieties (DVs) harbouring 23 blast-resistant genes, only 16 fragrant rice germplasms showed comparatively better performance against a virulent isolate of blast disease. The reaction pattern of single-spore isolate of Magnaporthe oryzae to differential varieties showed that Pish, Pi9, Pita-2 and Pita are the effective blast-resistant genes against the tested blast isolates in Bangladesh. The DNA markers profiles of selected 16 rice germplasms indicated that genotype Chinigura contained Pish, Pi9 and Pita genes; on the other hand, both BRRI dhan50 and Bawaibhog contained Pish and Pita genes in their genetic background. Genotypes Jirakatari, BR5, and Gopalbhog possessed Pish gene, while Uknimodhu, Deshikatari, Radhunipagol, Kalijira (3), Chinikanai each contained the Pita gene only. There are some materials that did not contain any target gene(s) in their genetic background, but proved resistant in pathogenicity tests. This information provided valuable genetic information for breeders to develop durable blast-resistant fragrant or aromatic rice varieties in Bangladesh. PMID:24841958

Khan, Mohammad Ashik Iqbal; Sen, Partha Pratim; Bhuiyan, Rejwan; Kabir, Enamul; Chowdhury, Abul Kashem; Fukuta, Yoshimichi; Ali, Ansar; Latif, Mohammad Abdul

2014-05-01

134

Launch vehicle aerodynamic flight test results  

NASA Technical Reports Server (NTRS)

The aerodynamic flight test procedures and results for the Space Shuttle orbiter are presented. The aerodynamic characteristics used in testing were determined from flights STS-1 and through STS-4. Normal force and pitching moment were different than predicted, suggesting an unanticipated aerodynamic force acting upward on the end of the orbiter. However, lateral-directional aerodynamic characteristics were in good management with good predictions. The flight measured aerodynamics are repeatable and show good correlation with angle of attack and angle of sideslip.

Gaines, L. M.; Osborn, W. L.; Wiltse, P. D.

1983-01-01

135

JPL pyro shock test approaches and results  

NASA Technical Reports Server (NTRS)

This paper presents the overall approach at JPL in performing spacecraft pyrotechnic shock qualification testing. Initially, the assembly shock requirements are developed early in the program based on previous spacecraft test experience and data. Pyrotechnic device development testing firings and spacecraft Development Test Model (DTM) pyro firings are then conducted to verify the adequacy of the assembly shock requirements and to determine the subsystem test firing and the subsequent system level test firing requirements. The electro-dynamic shaker, through shock synthesis techniques, is utilized to qualify the shock sensitive flight equipment with margins applied. Actual pyrotechnic device firings on spacecraft equipment or science instruments are performed when the influence of the pyros is localized and can be ignored at the system level. Full spacecraft system level shock tests, which include multiple firings of certain critical pyro devices, are conducted to verify the spacecraft design structural integrity and functions as well as to qualify hardware items which have not been previously qualified. These tests also provide a source of data from which assembly level requirements can be evaluated and compared. For example, during the Galileo program, the results demonstrated that good agreement between predicted and measured shock environments and adequate qualification of the flight spacecraft was achieved.

Chang, Kurng Y.

1986-01-01

136

BPX insulation irradiation program test results  

SciTech Connect

The toroidal field coil insulation for the Burning Plasma Experiment (BPX) is expected to receive a radiation dose of nearly 10{sup 10} rad and to withstand significant mechanical stresses. An irradiation test program was performed at the Idaho National Engineering Laboratory (INEL) using the Advanced Technology Reactor (ATR) for irradiations to doses on the order of 3 {times} 10{sup 10} rad. The flexure and shear strength with compression of commercially procured sheet material were reported earlier. A second series of tests has been performed to slightly higher dose levels with vacuum impregnated materials, glass strand material, and Spaulrad-S sheet samples. Vacuum impregnation with a Shell 9405 resin and 9470 hardener was used to produce bonded copper squares and flexure samples of both pure resin and resin with S-glass. A new test fixture was developed to test the bonded samples in shear without applied compression. The Spaulrad-S flexure samples demonstrated a loss of strength with irradiation, similar to previous results. The pure resin lost nearly all flexibility, while the S-glass-reinforced samples retained between 30% and 40% of the initial flexure strength. The S-glass strands showed a 30% loss of strength at the higher dose level when tested in tension. The bonded copper squares had a low room-temperature shear strength of approximately 17 MPa before irradiation, which was unchanged in the irradiated samples. Shear testing of unirradiated bonded copper squares with ten different types of surface treatment revealed that the low shear strength resulted from the polyurethane primer used. In the later series of test, the epoxy-based primers and DZ-80 from Ciba-Geigy did much better, with shear strengths on the order of 40 MPa. These samples also demonstrated a resistance to cryogenic shock. One irradiated bonded sample was tested up 10 210 MPa in compression, the limit of the test fixture, without failure.

McManamy, T.J. (Oak Ridge National Lab., TN (United States)); Kanemoto, G. (EG and G Idaho, Inc., Idaho Falls, ID (United States)); Snook, P.G. (Princeton Univ., NJ (United States). Plasma Physics Lab.)

1991-01-01

137

Spraengning mot Kompakterat Berg (Confined Volume Blasting),  

National Technical Information Service (NTIS)

SveDeFo has performed halfscale tests with confined volume blasting in LKAB:s mine in Malmberget in order to find out if that gives an improvement in fragmentation. The answer is yes. The fragmentation is better in confined volume blasting compared to ord...

M. Olsson

1987-01-01

138

Cascade Distiller System Performance Testing Interim Results  

NASA Technical Reports Server (NTRS)

The Cascade Distillation System (CDS) is a rotary distillation system with potential for greater reliability and lower energy costs than existing distillation systems. Based upon the results of the 2009 distillation comparison test (DCT) and recommendations of the expert panel, the Advanced Exploration Systems (AES) Water Recovery Project (WRP) project advanced the technology by increasing reliability of the system through redesign of bearing assemblies and improved rotor dynamics. In addition, the project improved the CDS power efficiency by optimizing the thermoelectric heat pump (TeHP) and heat exchanger design. Testing at the NASA-JSC Advanced Exploration System Water Laboratory (AES Water Lab) using a prototype Cascade Distillation Subsystem (CDS) wastewater processor (Honeywell d International, Torrance, Calif.) with test support equipment and control system developed by Johnson Space Center was performed to evaluate performance of the system with the upgrades as compared to previous system performance. The system was challenged with Solution 1 from the NASA Exploration Life Support (ELS) distillation comparison testing performed in 2009. Solution 1 consisted of a mixed stream containing human-generated urine and humidity condensate. A secondary objective of this testing is to evaluate the performance of the CDS as compared to the state of the art Distillation Assembly (DA) used in the ISS Urine Processor Assembly (UPA). This was done by challenging the system with ISS analog waste streams. This paper details the results of the AES WRP CDS performance testing.

Callahan, Michael R.; Pensinger, Stuart; Sargusingh, Miriam J.

2014-01-01

139

Durability of Portland blast-furnace slag cement concrete  

Microsoft Academic Search

This paper summarizes the results of studies carried out at the Building Research Establishment in the UK, on the performance and long-term durability of concrete where ground glassy blast-furnace slag (granulated and pelletized) has been used as a cementitious material. Using data from tests on site structures and laboratory and exposure site studies, comparisons are made of the properties and

G. J. Osborne

1999-01-01

140

Results from the STAR TPC system test  

Microsoft Academic Search

A system test of various components of the Solenoidal Tracker at RHIC (STAR) detector, operating in concert, has recently come on-line. Communication between a major sub-detector, a sector of the time projection chamber (TPC), and the trigger, data acquisition and slow controls systems has been established, enabling data from cosmic ray muons to be collected. First results from an analysis

W. Betts; F. Bieser; R. Bossingham; M. Botlo; M. Cherney; J. Chrin; P. Colarco; H. Crawford; K. Dao; H. Diaz; D. E. Greiner; L. Greiner; E. L. Hjort; S. Jacobson; R. C. Jared; E. Judd; S. R. Klein; A. N. Lebedev; M. J. LeVine; V. Lindenstruth; M. A. Lisa; K. Marks; C. McParland; T. S. McShane; J. Meier; M. T. Nguyen; D. L. Olson; I. Sakrejda; J. Schambach; R. A. Scheetz; N. T. B. Stone; C. E. Tull; G. Visser; C. Vu; H. Wieman; E. Yee

1997-01-01

141

Simulation of blast-furnace raceway conditions in a wire-mesh reactor: interference by the reactions of molybdenum mesh and initial results  

SciTech Connect

A novel trapped air injection system has been built for a wire-mesh reactor to enable tests with short exposure times to air that are intended to simulate typical residence times in blast-furnace raceways. Initial tests have shown that the molybdenum wire-mesh sample-holder reacts with O{sub 2} under conditions intended for this work. By varying the proportions of solid MoO{sub 2} (weight gain), vapor phase oxides (weight loss) may form, depending on reaction conditions. Oxide formation pathways thus become relevant to coal weight loss determinations during experiments. If, in addition to solid MoO{sub 2} formation, significant formation of vapor phase oxides occurs, then the weight change is more complicated to understand and the impact on the O{sub 2} concentration cannot be unravelled. Furthermore, it turns out that O{sub 2}-scavenging by the mesh affects the amount of O{sub 2} that is available to react with the coal sample. It was concluded that it is only possible to conduct reliable tests under conditions which the favor the formation of solid MoO{sub 2} only, as this leads to a quantifiable weight gain. Its impact can then be accounted for in the evaluation of the experimental weight change. In the case of MoO{sub 2} formation, the impact of the mesh oxidation on the amount of O{sub 2} available to react with the sample can also be estimated. It has been found that the wire-mesh reactor, equipped with the trapped air injection system, can be used to obtain valid data at up to 1600{sup o} C and 0.5 MPa. This pressure is similar to that of the blast-furnace raceway, but the temperature is several hundred degrees lower. However, preliminary tests have shown that useful kinetic data on the extents of reaction can be obtained with the equipment, provided it is operated under conditions that minimize the formation of vapor phase Mo oxides. 18 refs., 13 figs., 3 tabs.

Long Wu; N. Paterson; D.R. Dugwell; R. Kandiyoti [Imperial College London, London (United Kingdom). Department of Chemical Engineering

2006-12-15

142

Blast Loading Experiments of Developed Surrogate Models for TBI Scenarios  

NASA Astrophysics Data System (ADS)

This study aims to characterize the interaction of explosive blast waves through simulated anatomical systems. We have developed physical models and a systematic approach for testing traumatic brain injury (TBI) mechanisms and occurrences. A simplified series of models consisting of spherical PMMA shells followed by SLA prototyped skulls housing synthetic gelatins as brain simulants have been utilized. A series of experiments was conducted with the simple geometries to compare the sensitivity of the system response to mechanical properties of the simulants under high strain-rate explosive blasts. Small explosive charges were directed at the models to produce a realistic blast wave in a scaled laboratory setting. Blast profiles were measured and analyzed to compare system response severity. High-speed shadowgraph imaging captured blast wave interaction with the head model while particle tracking captured internal response for displacement and strain correlation. The results suggest amplification of shock waves inside the head due to impedance mismatches. Results from the strain correlations added to the theory of internal shearing between tissues.

Alley, Matthew; Son, Steven

2009-06-01

143

Results from the SLAC NLC Test Accelerator  

NASA Astrophysics Data System (ADS)

The design for the Next Linear Collider (NLC) at SLAC is based on two 11.4 GHz linacs operating at an unloaded acceleration gradient of 50 MV/m increasing to 85 MV/m as the energy is increased from 1/2 TeV to 1 TeV in the center of mass[1]. During the past several years there has been tremendous progress on the development of 11.4 GHz (X-band) RF systems. These developments include klystrons which operate at the required power and pulse length, pulse compression systems that achieve a factor of four power multiplication and structures that are specially designed to reduce long-range wakefields. Together with these developments, we have constructed a 1/2 GeV test accelerator, the NLC Test Accelerator (NLCTA). The NLCTA will serve as a test bed as the design of the NLC is refined. In addition to testing the RF system, the NLCTA is designed to address many questions related to the dynamics of the beam during acceleration, in particular the study of multibunch beam loading compensation and transverse beam break-up. In this paper we present the results from the initial round of experiments with the NLCTA. In particular we will cover the initial commisioning, experience with beamline and RF instrumentation, and finally, tests of beamloading compensation and transverse beam breakup.

Ruth, Ronald D.

1997-05-01

144

Blast Shock Wave Mitigation Using the Hydraulic Energy Redirection and Release Technology  

PubMed Central

A hydraulic energy redirection and release technology has been developed for mitigating the effects of blast shock waves on protected objects. The technology employs a liquid-filled plastic tubing as a blast overpressure transformer to transfer kinetic energy of blast shock waves into hydraulic energy in the plastic tubings. The hydraulic energy is redirected through the plastic tubings to the openings at the lower ends, and then is quickly released with the liquid flowing out through the openings. The samples of the specifically designed body armor in which the liquid-filled plastic tubings were installed vertically as the outer layer of the body armor were tested. The blast test results demonstrated that blast overpressure behind the body armor samples was remarkably reduced by 97% in 0.2 msec after the liquid flowed out of its appropriate volume through the openings. The results also suggested that a volumetric liquid surge might be created when kinetic energy of blast shock wave was transferred into hydraulic energy to cause a rapid physical movement or displacement of the liquid. The volumetric liquid surge has a strong destructive power, and can cause a noncontact, remote injury in humans (such as blast-induced traumatic brain injury and post-traumatic stress disorder) if it is created in cardiovascular system. The hydraulic energy redirection and release technology can successfully mitigate blast shock waves from the outer surface of the body armor. It should be further explored as an innovative approach to effectively protect against blast threats to civilian and military personnel.

Chen, Yun; Huang, Wei; Constantini, Shlomi

2012-01-01

145

Drop weight impact on hybrid-fiber ECC blast\\/shelter panels  

Microsoft Academic Search

This paper presents the results of an experimental study to evaluate the damage and failure mode of hybrid-fiber engineered cementitious composite (ECC) panels caused by large projectiles or fragments with the aim towards quantifying the extent to which hybrid-fiber ECC improves the resistance of blast panels against impact loading. Drop weight tests are conducted on full-scale blast\\/shelter panels (2 m

J. Zhang; M. Maalej; S. T. Quek; Y. Y. Teo

146

MAPS hybrid formal qualification performance test results  

Microsoft Academic Search

This paper presents the formal qualification test-performance (FQT-P) results of the Modular Azimuth Position System Hybrid (MAPSH) program. The MAPSH land navigation and orientation system consists of the Honeywell dynamic reference unit-hybrid, the precision lightweight GPS receiver (PLGR), the vehicle motion sensor, and a system unique control and display unit. The MAPSH program is being developed by the US Army

M. D. Slama; B. E. Fly

1996-01-01

147

Radiation test results on TK 1024 CCDs  

NASA Technical Reports Server (NTRS)

Results are presented from tests on TK 1024 CCDs with a multipinned phase (MPP) implant built into an experiental mask set. The average dark current as a function of temperature increased by a factor of about 3 for the 5 krads of gammas, which is a 10-fold increase for the extra 2 krads of protons. Histograms of the dark current show two types of dark current, an average level change, and dark current spikes.

Delamere, Alan; Murata-Seawalt, Debbie; Orbock, Jeff; Blouke, Morley; Fowler, Walt; Rebar, Frank

1990-01-01

148

Results from the final focus test beam  

SciTech Connect

first experimental results from the Final Focus Test Beam (FFTB) are given in this report. The FFTB has been constructed as a prototype for the final focus system of a future TeV-scale electron-positron linear collider. The vertical dimension of the 47 GeV electron beam form the SLAC linac has been reduced at the focal point of the FFTB by a demagnification of 320 to a beam height of approximately 70 nanometers.

Burke, D.L.; Final Focus Test Beam Collaboration

1994-07-01

149

Mild Blast Events Alter Anxiety, Memory, and Neural Activity Patterns in the Anterior Cingulate Cortex  

PubMed Central

There is a general interest in understanding of whether and how exposure to emotionally traumatizing events can alter memory function and anxiety behaviors. Here we have developed a novel laboratory-version of mild blast exposure comprised of high decibel bomb explosion sound coupled with strong air blast to mice. This model allows us to isolate the effects of emotionally fearful components from those of traumatic brain injury or bodily injury typical associated with bomb blasts. We demonstrate that this mild blast exposure is capable of impairing object recognition memory, increasing anxiety in elevated O-maze test, and resulting contextual generalization. Our in vivo neural ensemble recording reveal that such mild blast exposures produced diverse firing changes in the anterior cingulate cortex, a region processing emotional memory and inhibitory control. Moreover, we show that these real-time neural ensemble patterns underwent post-event reverberations, indicating rapid consolidation of those fearful experiences. Identification of blast-induced neural activity changes in the frontal brain may allow us to better understand how mild blast experiences result in abnormal changes in memory functions and excessive fear generalization related to post-traumatic stress disorder.

Xie, Kun; Kuang, Hui; Tsien, Joe Z.

2013-01-01

150

Reporting Testing Results: The Missing Key in Most Testing Programs.  

ERIC Educational Resources Information Center

Describes the plan used in Consolidated High School District 230, in Palos Hills (Illinois), for fostering an informed and interested school community by providing standardized test results to the school board, central and building administrators, parents, teachers, counselors, elementary educators, and the local press. (PGD)

Barnes, Ronald E.; And Others

1982-01-01

151

Copper staves in the blast furnace  

Microsoft Academic Search

Operational data for stave cooling systems for two German blast furnaces show good correlation with predicted thermal results. Copper staves have been installed in blast furnaces in the zones exposed to the highest thermal loads. The good operational results achieved confirm the choice of copper staves in the areas of maximum heat load. Both temperature measurements and predictions establish that

R. G. Helenbrook; W. Kowalski; K. H. Grosspietsch; H. Hille

1996-01-01

152

Results from the SLAC NLC test accelerator  

SciTech Connect

The design for the Next Linear Collider (NLC) at SLAC is based on two 11.4 GHz linacs operating at an unloaded acceleration gradient of 50 MV/m increasing to 85 MV/m as the energy is increased from 1/2 TeV to 1 TeV in the center of mass. During the past several years there has been tremendous progress on the development of 11.4 GHz (X-band) RF systems. These developments include klystrons which operate at the required powder and pulse length, pulse compression systems that achieve a factor of four power multiplication and structures that are specially designed to reduce long-range wakefields. Together with these developments, we have constructed a 1/2 GeV test accelerator, the NLC Test Accelerator (NLCTA). The NLCTA will serve as a test bed as the design of the NLC is refined. In addition to testing the RF system, the NLCTA is designed to address many questions related to the dynamics of the beam during acceleration, in particular, multibunch beam-loading compensation and transverse beam break-up. In this paper we describe the NLCTA and present results from initial experiments.

Ruth, R.D.; Adolphsen, C.; Allison, S. [and others

1997-06-01

153

Mild Traumatic Brain Injury and Conduction Aphasia from a Close Proximity Blast Resulting in Arcuate Fasciculus Damage Diagnosed on DTI Tractography.  

National Technical Information Service (NTIS)

The authors present a case demonstrating that a blast injury was associated with both conduction aphasia and an abnormality in the left Arcuate Fasciculus (AF) on MR DTI (Diffusion Tensor Imaging). In addition, this study showed the presence of conduction...

A. Kasprisin A. Rosen J. W. Ashford W. Han Y. Zhang

2009-01-01

154

Test Results from a High Power Linear Alternator Test Rig  

NASA Technical Reports Server (NTRS)

Stirling cycle power conversion is an enabling technology that provides high thermodynamic efficiency but also presents unique challenges with regard to electrical power generation, management, and distribution. The High Power Linear Alternator Test Rig (HPLATR) located at the NASA Glenn Research Center (GRC) in Cleveland, OH is a demonstration test bed that simulates electrical power generation from a Stirling engine driven alternator. It implements the high power electronics necessary to provide a well regulated DC user load bus. These power electronics use a novel design solution that includes active rectification and power factor control, active ripple suppression, along with a unique building block approach that permits the use of high voltage or high current alternator designs. This presentation describes the HPLATR, the test program, and the operational results.

Birchenough, Arthur G.; Hervol, David S.; Gardner, Brent G.

2010-01-01

155

Test Results From a High Power Linear Alternator Test Rig  

NASA Technical Reports Server (NTRS)

Stirling cycle power conversion is an enabling technology that provides high thermodynamic efficiency but also presents unique challenges with regard to electrical power generation, management, and distribution. The High Power Linear Alternator Test Rig (HPLATR) located at the NASA Glenn Research Center (GRC) in Cleveland, Ohio is a demonstration test bed that simulates electrical power generation from a Stirling engine driven alternator. It implements the high power electronics necessary to provide a well regulated DC user load bus. These power electronics use a novel design solution that includes active rectification and power factor control, active ripple suppression, along with a unique building block approach that permits the use of high voltage or high current alternator designs. This report describes the HPLATR, the test program, and the operational results.

Birchenough, Arthur G.; Hervol, David S.; Gardner, Brent G.

2010-01-01

156

Results from the STAR TPC system test  

SciTech Connect

A system test of various components of the Solenoidal Tracker at RHIC (STAR) detector, operating in concern, has recently come on-line. Communication between a major sub-detector, a sector of the Time Projection Chamber (TPC), and the trigger, data acquisition and slow controls systems has been established, enabling data from cosmic ray muons to be collected. First results from an analysis of the TPC data are presented. These include measurements of system noise, electronic parameters such as amplifier gains and pedestal values, and tracking resolution for cosmic ray muons and laser induced ionization tracks. A discussion on the experience gained in integrating the different components for the system test is also given.

Betts, W. [Univ. of Texas, Austin, TX (United States). Dept. of Physics; Bieser, F.; Bossingham, R. [Lawrence Berkeley National Lab., CA (United States)] [and others

1996-12-31

157

Highly Loaded Composite Strut Test Results  

NASA Technical Reports Server (NTRS)

Highly loaded composite struts from a proposed truss-based Altair lunar lander descent stage concept were selected for development under NASA's Advanced Composites Technology program. Predicted compressive member forces during launch and ascent of over -100,000 lbs were much greater than the tensile loads. Therefore, compressive failure modes, including structural stability, were primary design considerations. NASA's industry partner designed and built highly loaded struts that were delivered to NASA for testing. Their design, fabricated on a washout mandrel, had a uniform-diameter composite tube with composite tapered ends. Each tapered end contained a titanium end fitting with facing conical ramps that are overlaid and overwrapped with composite materials. The highly loaded struts were loaded in both tension and compression, with ultimate failure produced in compression. Results for the two struts tested are presented and discussed, along with measured deflections, strains and observed failure mechanisms.

Wu, K. C.; Jegley, Dawn C.; Barnard, Ansley; Phelps, James E.; McKeney, Martin J.

2011-01-01

158

GENIE Flight Test Results and System Overview  

NASA Technical Reports Server (NTRS)

NASA has envisioned a suite of lander test vehicles that will be flown in Earth s atmosphere to incrementally demonstrate applicable lunar lander performance in the terrestrial environment. As each terrestrial rocket progresses in maturity, relevant space flight technology matures to a higher technology readiness level, preparing it for inclusion on a future lunar lander design.. NASA s "Project M" lunar mission concept flew its first terrestrial rocket, RR1, in June 2010 in Caddo Mills, Texas. The Draper Laboratory built GENIE (Guidance Embedded Navigator Integration Environment) successfully demonstrated accurate, real time, embedded performance of Project M navigation and guidance algorithms in a highly dynamic environment. The RR1 vehicle, built by Armadillo Aerospace, performed a successful 60 second free flight and gave the team great confidence in Project M s highly reliable and robust GNC system design and implementation. This paper provides an overview of the GENIE system and describes recent flight performance test results onboard the RR1 terrestrial rocket.

Brady, Tye; Paschall, Stephen, II; Crain, Timothy P., II; Demars, Kyle; Bishop, Robert

2011-01-01

159

PHASE I SINGLE CELL ELECTROLYZER TEST RESULTS  

SciTech Connect

This document reports the results of Phase I Single Cell testing of an SO{sub 2}-Depolarized Water Electrolyzer. Testing was performed primarily during the first quarter of FY 2008 at the Savannah River National Laboratory (SRNL) using an electrolyzer cell designed and built at SRNL. Other facility hardware were also designed and built at SRNL. This test further advances this technology for which work began at SRNL in 2005. This research is valuable in achieving the ultimate goal of an economical hydrogen production process based on the Hybrid Sulfur (HyS) Cycle. The focus of this work was to conduct single cell electrolyzer tests to further develop the technology of SO{sub 2}-depolarized electrolysis as part of the HyS Cycle. The HyS Cycle is a hybrid thermochemical cycle that may be used in conjunction with advanced nuclear reactors or centralized solar receivers to produce hydrogen by water-splitting. Like all other sulfur-based cycles, HyS utilizes the high temperature thermal decomposition of sulfuric acid to produce oxygen and regenerate sulfur dioxide. The unique aspect of HyS is the generation of hydrogen in a water electrolyzer that is operated under conditions where dissolved sulfur dioxide depolarizes the anodic reaction, resulting in substantial voltage reduction. Low cell voltage is essential for both thermodynamic efficiency and hydrogen cost. Sulfur dioxide is oxidized at the anode, producing sulfuric acid that is sent to the high temperature acid decomposition portion of the cycle. The electrolyzer cell uses the membrane electrode assembly (MEA) concept. The anode and cathode are formed by spraying platinum containing catalyst on both sides of a Proton Exchange Membrane (PEM). In most testing the material of the PEM was NafionR. The electrolyzer cell active area can be as large as 54.8 cm{sup 2}. Feed to the anode of the electrolyzer is a sulfuric acid solution containing sulfur dioxide. The partial pressure of sulfur dioxide could be varied in the range of 1 to 6 atm (15 to 90 psia). Temperatures could be controlled in the range from ambient to 80 C. Hydrogen generated at the cathode of the cell was collected for the purpose of flow measurement and composition analysis. The test facility proved to be easy to operate, versatile, and reliable.

Steimke, J; Timothy Steeper, T

2008-08-05

160

Advanced Thermal Simulator Testing: Thermal Analysis and Test Results  

SciTech Connect

Work at the NASA Marshall Space Flight Center seeks to develop high fidelity, electrically heated thermal simulators that represent fuel elements in a nuclear reactor design to support non-nuclear testing applicable to the potential development of a space nuclear power or propulsion system. Comparison between the fuel pins and thermal simulators is made at the outer fuel clad surface, which corresponds to the outer sheath surface in the thermal simulator. The thermal simulators that are currently being tested correspond to a liquid metal cooled reactor design that could be applied for Lunar surface power. These simulators are designed to meet the geometric and power requirements of a proposed surface power reactor design, accommodate testing of various axial power profiles, and incorporate imbedded instrumentation. This paper reports the results of thermal simulator analysis and testing in a bare element configuration, which does not incorporate active heat removal, and testing in a water-cooled calorimeter designed to mimic the heat removal that would be experienced in a reactor core.

Bragg-Sitton, Shannon M.; Dickens, Ricky; Dixon, David; Reid, Robert; Adams, Mike; Davis, Joe [NASA Marshall Space Flight Center, Nuclear Systems Branch/ER24, MSFC, AL 35812 (United States)

2008-01-21

161

Advanced Thermal Simulator Testing: Thermal Analysis and Test Results  

NASA Technical Reports Server (NTRS)

Work at the NASA Marshall Space Flight Center seeks to develop high fidelity, electrically heated thermal simulators that represent fuel elements in a nuclear reactor design to support non-nuclear testing applicable to the development of a space nuclear power or propulsion system. Comparison between the fuel pins and thermal simulators is made at the outer fuel clad surface, which corresponds to the outer sheath surface in the thermal simulator. The thermal simulators that are currently being tested correspond to a SNAP derivative reactor design that could be applied for Lunar surface power. These simulators are designed to meet the geometric and power requirements of a proposed surface power reactor design, accommodate testing of various axial power profiles, and incorporate imbedded instrumentation. This paper reports the results of thermal simulator analysis and testing in a bare element configuration, which does not incorporate active heat removal, and testing in a water-cooled calorimeter designed to mimic the heat removal that would be experienced in a reactor core.

Bragg-Sitton, Shannon M.; Dickens, Ricky; Dixon, David; Reid, Robert; Adams, Mike; Davis, Joe

2008-01-01

162

Arc melter demonstration baseline test results  

SciTech Connect

This report describes the test results and evaluation for the Phase 1 (baseline) arc melter vitrification test series conducted for the Buried Waste Integrated Demonstration program (BWID). Phase 1 tests were conducted on surrogate mixtures of as-incinerated wastes and soil. Some buried wastes, soils, and stored wastes at the INEL and other DOE sites, are contaminated with transuranic (TRU) radionuclides and hazardous organics and metals. The high temperature environment in an electric arc furnace may be used to process these wastes to produce materials suitable for final disposal. An electric arc furnace system can treat heterogeneous wastes and contaminated soils by (a) dissolving and retaining TRU elements and selected toxic metals as oxides in the slag phase, (b) destroying organic materials by dissociation, pyrolyzation, and combustion, and (c) capturing separated volatilized metals in the offgas system for further treatment. Structural metals in the waste may be melted and tapped separately for recycle or disposal, or these metals may be oxidized and dissolved into the slag. The molten slag, after cooling, will provide a glass/ceramic final waste form that is homogeneous, highly nonleachable, and extremely durable. These features make this waste form suitable for immobilization of TRU radionuclides and toxic metals for geologic timeframes. Further, the volume of contaminated wastes and soils will be substantially reduced in the process.

Soelberg, N.R.; Chambers, A.G.; Anderson, G.L.; Oden, L.L.; O`Connor, W.K.; Turner, P.C.

1994-07-01

163

Thermal reclamation of spent blasting abrasive  

SciTech Connect

Abrasive blasting media is used to remove anticorrosive and antifoulant coatings from the hulls and tanks of US Navy ships. The total production of paint-contaminated spent abrasives from the eight US. Navy shipyards ranges from 75,000 to 100,000 tons per year. Most of this spent abrasive is disposed in landfills. Organic paint binders and heavy metals are present in the spent abrasives in concentrations sufficient to classify them as hazardous wastes in some states. In an effort to avoid the rising costs an long-term environmental liability associated with landfilling this waste, the US Navy has investigated various methods of reclaiming spent abrasives for reuse in hull- and tank-blasting operations. This paper discusses the results of a research and development project conducted under the Navy's Hazardous Waste Minimization Program to test a fluidized-bed sloped-grid (FBSG) reclaimer to determine if it could be used to recycle spent abrasive. Thirty tons of abrasive were processed and a product meeting military specifications for new abrasives was reclaimed. Blasting performance was also comparable to new abrasives. 3 refs., 1 fig., 2 tabs.

Bryan, B.G. (Institute of Gas Technology, Chicago, IL (USA)); Thomas, W.; Adema, C. (David Taylor Research Center, Annapolis, MD (USA))

1990-01-01

164

Modern BLAST Programs  

NASA Astrophysics Data System (ADS)

The Basic Local Alignment Search Tool (BLAST) is arguably the most widely used program in bioinformatics. By sacrificing sensitivity for speed, it makes sequence comparison practical on huge sequence databases currently available. The original version of BLAST was developed in 1990. Since then it has spawned a variant of specialized programs. This chapter surveys the development of BLAST and BLAST-like programs for homology search, discusses alignment statistics that are used in assessment of reported matches in BLAST, and provides the reader with guidance to select appropriate programs and set proper parameters to match research requirements.

Ma, Jian; Zhang, Louxin

165

FFTF (Fast Flux Test Facility) cobalt test assembly results  

SciTech Connect

A cobalt test assembly containing yttrium hydride pins for neutron moderation was irradiated in the Fast Flux Test Facility during Cycle 9A for 137.7 equivalent full power days at a power level of 291 MW. The 36 test pins consisted of a batch of 32 pins containing cobalt metal to produce Co-60, and a set of 4 pins with europium oxide to produce Gd-153, a radioisotope used in detection of the bone disease Osteoporosis. Post-irradiation examination of the cobalt pins determined the Co-60 produced with an accuracy of about 5%. The measured Co-60 spatially distributed concentrations were within 20% of the calculated concentrations. The assembly average Co-60 measured activity was 4% less than the calculated value. The europium oxide pins were gamma scanned for the europium isotopes Eu-152 and Eu-154 to an absolute accuracy of about 10%. The measured europium radioisotope and Gd-153 concentrations were within 20% of calculated values. In conclusion, the hydride assembly performed well and is an excellent vehicle for many Fast Flux Test Facility isotope production applications. The results also demonstrate that the calculational methods developed by the Westinghouse Hanford Company are very accurate. 4 refs., 3 figs., 1 tab.

Rawlins, J.A.; Wootan, D.W.; Carter, L.L.; Brager, H.R.; Schenter, R.E.

1987-10-01

166

Understanding the Results of Newborn Screening Test  

MedlinePLUS

... a sweat test because of an abnormal newborn screen do not have CF. It is important to be sure that they do not. If your baby’s screening test was “abnormal” or “positive” for CF, this means that your baby might have CF. A second type of test, the sweat test, is needed ...

167

Rodent model of direct cranial blast injury.  

PubMed

Traumatic brain injury resulting from an explosive blast is one of the most serious wounds suffered by warfighters, yet the effects of explosive blast overpressure directly impacting the head are poorly understood. We developed a rodent model of direct cranial blast injury (dcBI), in which a blast overpressure could be delivered exclusively to the head, precluding indirect brain injury via thoracic transmission of the blast wave. We constructed and validated a Cranium Only Blast Injury Apparatus (COBIA) to deliver blast overpressures generated by detonating .22 caliber cartridges of smokeless powder. Blast waveforms generated by COBIA replicated those recorded within armored vehicles penetrated by munitions. Lethal dcBI (LD(50) ? 515?kPa) was associated with: (1) apparent brainstem failure, characterized by immediate opisthotonus and apnea leading to cardiac arrest that could not be overcome by cardiopulmonary resuscitation; (2) widespread subarachnoid hemorrhages without cortical contusions or intracerebral or intraventricular hemorrhages; and (3) no pulmonary abnormalities. Sub-lethal dcBI was associated with: (1) apnea lasting up to 15?sec, with transient abnormalities in oxygen saturation; (2) very few delayed deaths; (3) subarachnoid hemorrhages, especially in the path of the blast wave; (4) abnormal immunolabeling for IgG, cleaved caspase-3, and ?-amyloid precursor protein (?-APP), and staining for Fluoro-Jade C, all in deep brain regions away from the subarachnoid hemorrhages, but in the path of the blast wave; and (5) abnormalities on the accelerating Rotarod that persisted for the 1 week period of observation. We conclude that exposure of the head alone to severe explosive blast predisposes to significant neurological dysfunction. PMID:21639724

Kuehn, Reed; Simard, Philippe F; Driscoll, Ian; Keledjian, Kaspar; Ivanova, Svetlana; Tosun, Cigdem; Williams, Alicia; Bochicchio, Grant; Gerzanich, Volodymyr; Simard, J Marc

2011-10-01

168

Coupled rock motion and gas flow modeling in blasting  

Microsoft Academic Search

The spherical element computer code DMC (Distinct Motion Code) used to model rock motion resulting from blasting has been enhanced to allow routine computer simulations of bench blasting. The enhancements required for bench blast simulation include: (1) modifying the gas flow portion of DMC, (2) adding a new explosive gas equation of state capability, (3) modifying the porosity calculation, and

D. S. Preece; S. D. Knudsen

1991-01-01

169

Advanced wing design survivability testing and results  

NASA Technical Reports Server (NTRS)

Composite wings on current operational aircraft are conservatively designed to account for stress/strain concentrations, and to assure specified damage tolerance. The technology that can lead to improved composite wing structures and associated structural efficiency is to increase design ultimate strain levels beyond their current limit of 3500 to 4000 micro-in/in to 6000 micro-in/in without sacrificing structural integrity, durability, damage tolerance, or survivability. Grumman, under the sponsorship of the Naval Air Development Center (NADC), has developed a high-strain composite wing design for a subsonic aircraft wing using novel and innovative design concepts and manufacturing methods, while maintaining a state-of-the-art fiber/resin system. The current advanced wing design effort addressed a tactical subsonic aircraft wing using previously developed, high-strain wing design concepts in conjunction with newer/emerging fiber and polymer matrix composite (PMC) materials to achieve the same goals, while reducing complexity. Two categories of advanced PMC materials were evaluated: toughened thermosets; and engineered thermoplastics. Advanced PMC materials offer the technological opportunity to take maximum advantage of improved material properties, physical characteristics, and tailorability to increase performance and survivability over current composite structure. Damage tolerance and survivability to various threats, in addition to structural integrity and durability, were key technical issues addressed during this study, and evaluated through test. This paper focuses on the live-fire testing, and the results performed to experimentally evaluate the survivability of the advanced wing design.

Bruno, J.; Tobias, M.

1992-01-01

170

LTC American`s, Inc. vacuum blasting machine: Baseline report  

SciTech Connect

The LTC shot blast technology was tested and is being evaluated at Florida International University (FIU) as a baseline technology. In conjunction with FIU`s evaluation of efficiency and cost, this report covers the evaluation conducted for safety and health issues. It is a commercially available technology and has been used for various projects at locations throughout the country. The LTC 1073 Vacuum Blasting Machine uses a high-capacity, direct-pressure blasting system which incorporates a continuous feed for the blast media. The blast media cleans the surface within the contained brush area of the blast. It incorporates a vacuum system which removes dust and debris from the surface as it is blasted. The safety and health evaluation during the testing focused on two main areas of exposure: dust and noise.

NONE

1997-07-31

171

Test results of heavily irradiated Si detectors  

NASA Astrophysics Data System (ADS)

A large use of silicon microstrip detectors is foreseen for the intermediate part of the CMS tracker. A specific research and development program has been carried out with the aim of finding design layouts and technological solutions for allowing silicon microstrip detectors to be reliably used on a high radiation level environment. As a result of this work single sided, AC-coupled, polysilicon biased, 300 ? m thick, p + on n substrate detectors were chosen. Irradiation tests have been performed on prototypes up to fluence 2×10 14 n/cm 2. The detector performances do not significantly change if the detectors are biased well above the depletion voltage. S/ N is reduced by less than 20%, still enough to insure a good efficiency and space resolution. Multiguard structures has been developed in order to reach high voltage operation (above 500 V).

Albergo, S.; Azzi, P.; Babucci, E.; Bacchetta, N.; Bader, A.; Bagliesi, G.; Bartalini, P.; Basti, A.; Biggeri, U.; Bilei, G. M.; Bisello, D.; Boemi, D.; Bosi, F.; Borrello, L.; Bozzi, C.; Breuker, H.; Bruzzi, M.; Candelori, A.; Caner, A.; Castaldi, R.; Castro, A.; Catacchini, E.; Checcucci, B.; Ciampolini, P.; Civinini, C.; Connotte, J.; Creanza, D.; D'Alessandro, R.; Da Rold, M.; de Palma, M.; Dell'Orso, R.; Della Marina, R.; Eklund, C.; Elliott-Peisert, A.; Feld, L.; Fiore, L.; Focardi, E.; French, M.; Freudenreich, K.; Giassi, A.; Giraldo, A.; Glessing, B.; Gu, W. H.; Hall, G.; Hammerstrom, R.; Hrubec, J.; Huhtinen, M.; Karimaki, V.; Krammer, M.; Lariccia, P.; Lenzi, M.; Loreti, M.; Luebelsmeyer, K.; Lustermann, W.; Maggi, G.; Mannelli, M.; Mantovani, G.; Marchioro, A.; Martignon, G.; Mc Evoy, B.; Meschini, M.; Messineo, A.; My, S.; Paccagnella, A.; Palla, F.; Pandoulas, D.; Parrini, G.; Passeri, D.; Pieri, M.; Piperov, S.; Potenza, R.; Raffaelli, F.; Raso, G.; Raymond, M.; Schmitt, B.; Selvaggi, G.; Servoli, L.; Sguazzoni, G.; Siedling, R.; Silvestris, L.; Skog, K.; Starodumov, A.; Stavitski, I.; Stefanini, G.; Tempesta, P.; Tonelli, G.; Tricomi, A.; Tuuva, T.; Vannini, C.; Verdini, P. G.; Viertel, G.; Xie, Z.; Wang, Y.; Watts, S.; Wittmer, B.

1999-02-01

172

Lunar Water Resource Demonstration (LWRD) Test Results  

NASA Technical Reports Server (NTRS)

NASA has undertaken the In-Situ Resource Utilization (lSRU) project called RESOLVE (Regolith and Environment Science & Oxygen and Lunar Volatile Extraction). This project is an Earth-based lunar precursor demonstration of a system that could be sent to explore permanently shadowed polar lunar craters, where it would drill into regolith, quantify the volatiles that are present, and extract oxygen by hydrogen reduction of iron oxides. The RESOLVE chemical processing system was mounted within the CMU rover "Scarab" and successfully demonstrated on Hawaii's Mauna Kea volcano in November 2008. This technology could be used on Mars as well. As described at the 2008 Mars Society Convention, the Lunar Water Resource Demonstration (LWRD) supports the objectives of the RESOLVE project by capturing and quantifying water and hydrogen released by regolith upon heating. Field test results for the quantification of water using LWRD showed that the volcanic ash (tephra) samples contained 0.15-0.41% water, in agreement with GC water measurements. Reduction of the RH in the surge tank to near zero during recirculation show that the water is captured by the water beds as desired. The water can be recovered by heating the Water Beds to 230 C or higher. Test results for the capture and quantification of pure hydrogen have shown that over 90% of the hydrogen can be captured and 98% of the absorbed hydrogen can be recovered upon heating the hydride to 400 C and desorbing the hydrogen several times into the evacuated surge tank. Thus, the essential requirement of capturing hydrogen and recovering it has been demonstrated. ,

Muscatello, Anthony C.; Captain, Janine E.; Quinn, Jacqueline W.; Gibson, Tracy L.; Perusich, Stephen A.; Weis, Kyle H.

2009-01-01

173

Partial-Array Test Results in IFSMTF.  

National Technical Information Service (NTIS)

Preliminary performance tests of two large superconducting magnets have been carried out in the International Fusion Superconducting Magnet Test Facility (IFSMTF). Each of the Japanese (JA) and General Dynamics/Convair (GD) coils was operated up to its fu...

J. W. Lue L. Dresner K. Koizumi M. S. Lubell J. N. Luton

1985-01-01

174

Diffuse and spatially variable white matter disruptions are associated with blast-related mild traumatic brain injury.  

PubMed

Mild traumatic brain injury (mTBI) due to explosive blast is common among military service members and often associated with long term psychological and cognitive disruptions. Little is known about the neurological effects of blast-related mTBI and whether they differ from those of civilian, non-blast mTBI. Given that brain damage from blasts may be diffuse and heterogeneous, we tested the hypothesis that blast mTBI is associated with subtle white matter disruptions in the brain that are spatially inconsistent across individuals. We used diffusion tensor imaging to examine white matter integrity, as quantified by fractional anisotropy (FA), in a group of American military service members with (n=25) or without (n=33) blast-related mTBI who had been deployed as part of Operation Iraqi Freedom or Operation Enduring Freedom. History of civilian non-blast mTBI was equally common across groups, which enabled testing of both blast and non-blast mTBI effects on measures sensitive to (1) concentrated, spatially consistent (average FA within a region of interest [ROI]), (2) concentrated, spatially variable (number of ROIs with low average FA), and (3) diffuse (number of voxels with low FA) disruptions of white matter integrity. Blast mTBI was associated with a diffuse, global pattern of lower white matter integrity, and this pattern was not affected by previous civilian mTBI. Neither type of mTBI had an effect on the measures sensitive to more concentrated and spatially consistent white matter disruptions. Additionally, individuals with more than one blast mTBI tended to have a larger number of low FA voxels than individuals with a single blast injury. These results indicate that blast mTBI is associated with disrupted integrity of several white matter tracts, and that these disruptions are diluted by averaging across the large number of voxels within an ROI. The reported pattern of effects supports the conclusion that the neurological effects of blast mTBI are diffuse, widespread, and spatially variable. PMID:22040736

Davenport, Nicholas D; Lim, Kelvin O; Armstrong, Michael T; Sponheim, Scott R

2012-02-01

175

Color changing photonic crystals detect blast exposure.  

PubMed

Blast-induced traumatic brain injury (bTBI) is the "signature wound" of the current wars in Iraq and Afghanistan. However, with no objective information of relative blast exposure, warfighters with bTBI may not receive appropriate medical care and are at risk of being returned to the battlefield. Accordingly, we have created a colorimetric blast injury dosimeter (BID) that exploits material failure of photonic crystals to detect blast exposure. Appearing like a colored sticker, the BID is fabricated in photosensitive polymers via multi-beam interference lithography. Although very stable in the presence of heat, cold or physical impact, sculpted micro- and nano-structures of the BID are physically altered in a precise manner by blast exposure, resulting in color changes that correspond with blast intensity. This approach offers a lightweight, power-free sensor that can be readily interpreted by the naked eye. Importantly, with future refinement this technology may be deployed to identify soldiers exposed to blast at levels suggested to be supra-threshold for non-impact blast-induced mild TBI. PMID:21040795

Cullen, D Kacy; Xu, Yongan; Reneer, Dexter V; Browne, Kevin D; Geddes, James W; Yang, Shu; Smith, Douglas H

2011-01-01

176

Scientific director`s report of atomic weapon tests at Eniwetok, 1951. Annex 1.6. Blast measurements, Part I. Summary report  

Microsoft Academic Search

Measurements of the blast pressures in Shots Dog, Easy, and George, together with earth-shock measurements on Shots Easy and George, gave new and important information concerning the magnitude and character of the blast wave near an atomic bomb. These experiments showed that secondary phenomena due presumably to thermal radiation and ion combination affect the pressure wave rather markedly near the

G. K. Hartmann; C. W. Lampson; C. J. Aronson

1951-01-01

177

Operation Teapot, Nevada Test Site, February-May 1955. Project 33. 2. The effects of noise in blast-resistant shelters  

Microsoft Academic Search

A fatigue syndrome was observed to develop in animals that experience a nuclear explosion while confined in a blast-resistant shelter. In order to determine the importance of noise as a contributing factor, groups of deafened and nondeafened albino male rats were placed in blast-resistant shelters on two explosions of the Operation Teapot series. Noise measurements were made which showed that

F. G. Hirsch; Longhurst; D. R. McGiboney; H. H. Sander

1956-01-01

178

Testing of an inertial-reference system concept to measure blast-induced displacements of vehicles. Final contract report, 23 March23 July 1987  

Microsoft Academic Search

This work is the first phase of a project to develop an inertial-reference system to measure the displacement of military vehicles exposed to a blast wave in large shock tubes or high-explosive simulations of nuclear weapons. Experimental data describing the movement of military vehicles by blast is required for survivability assessments of such vehicles and for validation of computer models

N. H. Ethridge; L. A. Dixon; W. F. Jackson

1987-01-01

179

Wet-dry cooling demonstration. Test results  

Microsoft Academic Search

A large-scale test of dry\\/wet cooling using the ammonia phase-change system, designated the Advanced Concepts Test (ACT), has been operated at Pacific Gas and Electric Company's Kern Station at Bakersfield, California. The facility is capable of condensing 60,000 lbs\\/h of steam from a small house turbine. Two different modes of combining dry and evaporative cooling have been tested. One uses

R. T. Allemann; D. E. DeBellis; E. V. Werry; B. M. Johnson

1986-01-01

180

42 CFR 493.1281 - Standard: Comparison of test results.  

Code of Federal Regulations, 2010 CFR

...evaluates and defines the relationship between test results using the different methodologies...Distribution of patient test results. (5) Relationship with other test parameters...laboratory must document all test result comparison...

2009-10-01

181

42 CFR 493.1281 - Standard: Comparison of test results.  

Code of Federal Regulations, 2010 CFR

...evaluates and defines the relationship between test results using the different methodologies...Distribution of patient test results. (5) Relationship with other test parameters...laboratory must document all test result comparison...

2010-10-01

182

Blasting injuries in surface mining with emphasis on flyrock and blast area security  

Microsoft Academic Search

Problem: Blasting is a hazardous component of surface mining. Serious injuries and fatalities result from improper judgment or practice during rock blasting. This paper describes several fatal injury case studies, analyzes causative factors, and emphasizes preventive measures. Method: This study examines publications by MSHA, USGS, and other authors. The primary source of information was MSHA's injury-related publications. Results: During the

T. S. Bajpayee; T. R. Rehak; G. L. Mowrey; D. K. Ingram

2004-01-01

183

Blast furnace stove control  

SciTech Connect

This paper outlines the process model and model-based control techniques implemented on the hot blast stoves for the No. 7 Blast Furnace at the Inland Steel facility in East Chicago, Indiana. A detailed heat transfer model of the stoves is developed. It is then used as part of a predictive control scheme to determine the minimum amount of fuel necessary to achieve the blast air requirements. The controller also considers maximum and minimum temperature constraints within the stove.

Muske, K.R. [Villanova Univ., PA (United States). Dept. of Chemical Engineering; Hansen, G.A.; Howse, J.W.; Cagliostro, D.J. [Los Alamos National Lab., NM (United States); Chaubal, P.C. [Inland Steel Industries Inc., East Chicago, IN (United States). Research Labs.

1998-12-31

184

Heated Promoted Combustion-Initial Test Results  

NASA Technical Reports Server (NTRS)

The purpose of the STD 6001 test 17 is to determine the flammability of materials in GOX at ambient temperature and at use pressure. The purpose of the new Heated Promoted combustion test is to determine the flammability of material in GOX at use temperature and pressure. The objective is to present the new heated promoted combustion method and show initial data and trends for three representative metals.

Engel, Carl D.; Herald, Stephen; Davis, S. Eddie

2005-01-01

185

Confined volume blasting experiments: Description and analysis  

SciTech Connect

A series of bench-scale blasting experiments was conducted to produce rubble beds for use in retorting experiments. The experiments consisted of blasting oil shale with explosives within a confined volume containing 25% void. A variety of blasting geometries was used to control the fragment size distribution and void distribution in the rubble. The series of well controlled tests provided excellent data for use in validating rock fragmentation models. Analyses of the experiments with PRONTO, a dynamic finite element computer code, and a newly developed fracturing model provided good agreement between code predictions and experimental measurements of fracture extent and fragment size. CAROM, a dynamic distinct element code developed to model rock motion during blasting, was used to model the fully fragmented tests. Calculations of the void distribution agreed well with experimentally measured values. 9 refs., 11 figs., 1 tab.

Gorham-Bergeron, E.; Kuszmaul, J.S.; Bickel, T.C.; Shirey, D.L.

1987-01-01

186

An assessment of environmental impacts of quarry-blasting operation: a case study in Istanbul, Turkey  

Microsoft Academic Search

This study evaluates the impacts resulting from quarry-blasting operation on nearby buildings and structures as it generates ground vibration, air blast, and fly rocks. In this paper, first blasting operation and its possible environmental effects are defined. Then the methods of blast-vibration prediction and commonly accepted criteria to prevent damage were introduced. A field experimental work was conducted to minimize

Cengiz Kuzu; Hasan Ergin

2005-01-01

187

A computational model of blast loading on the human eye.  

PubMed

Ocular injuries from blast have increased in recent wars, but the injury mechanism associated with the primary blast wave is unknown. We employ a three-dimensional fluid-structure interaction computational model to understand the stresses and deformations incurred by the globe due to blast overpressure. Our numerical results demonstrate that the blast wave reflections off the facial features around the eye increase the pressure loading on and around the eye. The blast wave produces asymmetric loading on the eye, which causes globe distortion. The deformation response of the globe under blast loading was evaluated, and regions of high stresses and strains inside the globe were identified. Our numerical results show that the blast loading results in globe distortion and large deviatoric stresses in the sclera. These large deviatoric stresses may be indicator for the risk of interfacial failure between the tissues of the sclera and the orbit. PMID:23591604

Bhardwaj, Rajneesh; Ziegler, Kimberly; Seo, Jung Hee; Ramesh, K T; Nguyen, Thao D

2014-01-01

188

Discrete fiber-reinforced polyurea systems for infrastructure strengthening and blast mitigation  

NASA Astrophysics Data System (ADS)

The research presented in this dissertation focused on evaluating the effectiveness of various blast mitigation materials and coating technologies to be used for enhancing blast resistance of structural members. Mechanical properties and blast mitigation performance of different discrete fiber-reinforced polyurea (DFRP) systems were investigated through experimental and analytical work. Four technical papers discuss the research efforts conducted within this dissertation. The first paper examined the development and characterization of different DFRP systems for infrastructure strengthening and blast retrofit. The behavior of various systems which consisted of chopped E-glass fibers discretely integrated in with the polyurea matrix was evaluated through coupon tensile testing. The addition of glass fiber to a polymer coating provided improved stiffness and strength to the composite system while the polyurea base material provided ductility. The second paper evaluated the behavior of hybrid, plain, and steel fiber-reinforced concrete panels coated with various polyurea and DFRP systems under blast loading. Hybrid panels demonstrated higher blast mitigation performance compared to plain and steel fiber-reinforced concrete panels due to sacrificial hybrid layer. The addition of plain polyurea or DFRP systems on the tension side improved panel performance by containing fragmentation during a blast event. The third paper presents an analytical investigation conducted using the explicit finite element program LS-DYNA to model panel and coating response under blast loading. Several modeling solutions were undertaken and compared for concrete formulation. Modeling results were analyzed and compared to the experimental work to validate the conclusions. The final paper describes an internal equilibrium mechanics based model developed to predict the flexural capacity of reinforced concrete beams strengthened with various DFRP systems. The developed model was validated using available experimental results. A parametric analysis was conducted on four aged bridges in Missouri using an internal force equilibrium approach and material characterization results of the various DFRP systems to evaluate an increase in flexural capacity due to strengthening systems.

Carey, Natalia L.

189

Code Verification Results of an LLNL ASC Code on Some Tri-Lab Verification Test Suite Problems  

SciTech Connect

As scientific codes become more complex and involve larger numbers of developers and algorithms, chances for algorithmic implementation mistakes increase. In this environment, code verification becomes essential to building confidence in the code implementation. This paper will present first results of a new code verification effort within LLNL's B Division. In particular, we will show results of code verification of the LLNL ASC ARES code on the test problems: Su Olson non-equilibrium radiation diffusion, Sod shock tube, Sedov point blast modeled with shock hydrodynamics, and Noh implosion.

Anderson, S R; Bihari, B L; Salari, K; Woodward, C S

2006-12-29

190

Flexible Ablators Char Depths LHMEL Test Results  

NASA Technical Reports Server (NTRS)

Char and pyrolysis zone depths give physical evidence of peak temperature reached in depth: The pyrolyzing material acts as a temperature indicator within its characteristic thermal decomposition range. A matrix of novel flexible ablators were laser tested in one component of material screening for NASA Entry, Descent and Landing research for future Mars missions. LHMEL tests were run both on virgin materials, and on previously charred materials for a dual pulse simulation of the heating due to aerocapture followed by atmospheric entry. The test models were machined to expose the cross-sections. Char measurements were made at three locations near the center of the exposed area. Data are presented showing the char depths developed in these flexible materials, grouped by reinforcing fiber and pyrolyzing material type.

White, Susan; Qu, Vince; Fan, Wendy; Stackpoole, Mairead; Thornton, Jeremy

2012-01-01

191

Autogenous shrinkage of concrete containing granulated blast-furnace slag  

Microsoft Academic Search

This paper presents the experimental results and prediction model for the autogenous shrinkage of concrete made with various water-to-cementitious materials ratios (w\\/cm) ranging from 0.27 to 0.42 and granulated blast-furnace slag (BFS) in the range of 0% to 50% by mass of the total cementitious materials. Test results showed that BFS concrete exhibited greater autogenous shrinkage than ordinary concrete with

K. M. Lee; H. K. Lee; S. H. Lee; G. Y. Kim

2006-01-01

192

Avco Lycoming emission and flight test results  

NASA Technical Reports Server (NTRS)

The Avco Lycoming flight test program for reduced emissions was conducted to determine and document the lean fuel schedule limits for current production aircraft based on flight safety. Based on analysis of the emissions profile, Avco Lycoming proposed to evaluate the effect of leaner schedules in the idle/taxi, climb, and approach modes. These modes were selected as areas where it was felt that possible improvements could be made with the greatest improvement in cyclic emissions reduction. The fuel systems to produce these leaner stepped fuel schedules were tailored specifically for the flight test.

Duke, L. C.

1976-01-01

193

Blast Resistance and Damage Modelling of Fibre Metal Laminates to Blast Loads  

NASA Astrophysics Data System (ADS)

A robust and efficient computational model has been developed which is capable of modelling the dynamic non-linear behaviour of GLARE panels subjected to blast loadings. Numerical model validation have been performed considering case studies of GLARE panels subjected to a blast-type pressure pulse for which experimental data on the back-face deflection and post-damage observations were available. Excellent agreement of mid-point deflections and evidence of severe yield line deformation were shown and discussed against the performed blast tests. A further parametric study identified GLARE as a potential blast attenuating structure, exhibiting superior blast potential against monolithic aluminium plates. It was concluded that further work needed to be carried out to take into account the influence of geometry (cylindrical structures), pre-pressurisation effects and boundary conditions

Mohamed, Galal F. A.; Soutis, Costas; Hodzic, Alma

2012-06-01

194

Wet-dry cooling demonstration. Test results  

SciTech Connect

A large-scale test of dry/wet cooling using the ammonia phase-change system, designated the Advanced Concepts Test (ACT), has been operated at Pacific Gas and Electric Company's Kern Station at Bakersfield, California. The facility is capable of condensing 60,000 lbs/h of steam from a small house turbine. Two different modes of combining dry and evaporative cooling have been tested. One uses deluge cooling in which water is allowed to flow over the fins of the dry (air-cooled) heat exchanger on hot days; the other uses a separate evaporative condenser in parallel to the dry heat exchanger. A third mode of enhancing the dry cooling system, termed capacitive cooling has been tested. In this system, the ammonia-cooled steam condenser is supplemented by a parallel conventional water-cooled condenser with water supplied from a closed system. This water is cooled during off-peak hours each night by an ammonia heat pump which rejects heat through the ACT Cooling Tower. If operated over the period of a year, each of the wet/dry systems would use only 25% of the water normally required to reject this heat load in an evaporative cooling tower. The third would consume no water, the evaporative cooling being replaced by the delayed cooling of the closed system water supply.

Allemann, R.T.; DeBellis, D.E.; Werry, E.V.; Johnson, B.M.

1986-05-01

195

HALTHANE polyol round robin test results  

Microsoft Academic Search

A round robin chemical analysis of two halthane adhesive polyol cure agents for hydroxyl number, acid number, and water content has been conducted between analytical laboratories at LLL, Pantex, Bendix, and Union Carbide (Y-12). The reported data show sufficient scatter as to recommend that specific test procedures be called out. Different methods were used in the various labs, some with

1976-01-01

196

Phase C Flygt Mixer Test Results  

SciTech Connect

The Savannah River Site (SRS) teamed with the Pacific Northwest National Laboratory (PNNL), Oak Ridge National Laboratory (ORNL), and ITT Flygt Corporation to conduct a test program evaluating shrouded axial propeller mixers (Flygt mixers) for heel removal in SRS Tank 19. SRS is identifying and investigating techniques to remove sludge heels from waste tanks such as Tank 19.

Poirier, M.R.

1999-06-08

197

Construction of Customized Sub-Databases from NCBI-nr Database for Rapid Annotation of Huge Metagenomic Datasets Using a Combined BLAST and MEGAN Approach  

PubMed Central

We developed a fast method to construct local sub-databases from the NCBI-nr database for the quick similarity search and annotation of huge metagenomic datasets based on BLAST-MEGAN approach. A three-step sub-database annotation pipeline (SAP) was further proposed to conduct the annotation in a much more time-efficient way which required far less computational capacity than the direct NCBI-nr database BLAST-MEGAN approach. The 1st BLAST of SAP was conducted using the original metagenomic dataset against the constructed sub-database for a quick screening of candidate target sequences. Then, the candidate target sequences identified in the 1st BLAST were subjected to the 2nd BLAST against the whole NCBI-nr database. The BLAST results were finally annotated using MEGAN to filter out those mistakenly selected sequences in the 1st BLAST to guarantee the accuracy of the results. Based on the tests conducted in this study, SAP achieved a speedup of ?150–385 times at the BLAST e-value of 1e–5, compared to the direct BLAST against NCBI-nr database. The annotation results of SAP are exactly in agreement with those of the direct NCBI-nr database BLAST-MEGAN approach, which is very time-consuming and computationally intensive. Selecting rigorous thresholds (e.g. e-value of 1e–10) would further accelerate SAP process. The SAP pipeline may also be coupled with novel similarity search tools (e.g. RAPsearch) other than BLAST to achieve even faster annotation of huge metagenomic datasets. Above all, this sub-database construction method and SAP pipeline provides a new time-efficient and convenient annotation similarity search strategy for laboratories without access to high performance computing facilities. SAP also offers a solution to high performance computing facilities for the processing of more similarity search tasks.

Yu, Ke; Zhang, Tong

2013-01-01

198

Liquid Motion Experiment Flight Test Results  

NASA Technical Reports Server (NTRS)

The Liquid Motion Experiment (LME), designed to study the effects of liquid motion in rotating tanks, was flown on STS 84. LME was essentially a spin table that created a realistic nutation motion of scale-model tanks containing liquid. TWo spherical and two cylindrical transparent tanks were tested simultaneously, and three sets of such tanks were employed to vary liquid viscosity, fill level, and propellant management device (PMD) design. All the tanks were approximately 4.5 inches diameter. The primary test measurements were the radial and tangential torques exerted on the tanks by the liquid. Resonant frequencies and damping of the liquid oscillations were determined by sine sweep tests. For a given tank shape, the resonant frequency depended on fill level. For the cylindrical tanks, the resonances had somewhat different frequencies for the tangential axis (0.55 to 0.75 times spin rate) and the radial axis (0.73 to 0.78 times spin rate), and the tangential axis resonance agreed more closely with available analytical models. For the spherical tanks, the resonant frequencies were between 0.74 to 0.77 times the spin rate and were the same for the tangential and radial axes. The damping coefficients varied from about I% to 3% of critical, depending on tank shape, fill level, and liquid viscosity. 'Me viscous energy dissipation rates of the liquid oscillations were determined from sine dwell tests. The LME energy dissipation rates varied from 0.3 to 0.5 times the estimates obtained from scaling previous ground tests and spacecraft flight data. The PNDs sometimes enhanced the resonances and energy dissipation rates and sometimes decreased them, which points out the need to understand better the effects of PMD on liquid motion as a function of PMD and tank design.

Chato David J.; Dalton, Penni J.; Dodge, Franklin T.; Green, Steve

1998-01-01

199

Implementation of the exploding wire technique to study blast-wave-structure interaction  

NASA Astrophysics Data System (ADS)

The effort invested in improving our understanding of the physics of high-energy explosion events has been steadily increasing since the latter part of the twentieth century. Moreover, the dramatic increase in computer power over the last two decades has made the numerical simulation approach the dominant tool for investigating blast phenomena and their effects. However, field tests, on both large and small scales, are still in use. In the current paper, we present an experimental tool to better resolve and study the blast-structure interaction phenomenon and to help validate the numerical simulations of the same. The experimental tool uses an exploding wire technique to generate small-scale cylindrical and spherical blast waves. This approach permits safe operation, high repeatability, and the use of advanced diagnostic systems. The system was calibrated using an analytical model, an empirical model, and numerical simulation. To insure that spherical blast geometry was achieved, a set of free air blast experiments was done in which high-speed photography was used to monitor the blast structure. A scenario in which an explosion occurred in the vicinity of a structure demonstrated the system's capabilities. Using this simple but not trivial configuration showed unequivocally the effectiveness of this tool. From this comparison, it was found that at early times of blast-structure interaction, the agreement between the two sets of results was very good, but at later times incongruences appeared. Effort has been made to interpret this observation. Furthermore, by using similitude analysis, the results obtained from the small-scale experiments can be applied to the full-scale problem. We have shown that an exploding wire system offers an inexpensive, safe, easy to operate, and effective tool for studying phenomena related to blast-wave-structure interactions.

Ram, O.; Sadot, O.

2012-11-01

200

Numerical simulations of near-field blast effects using kinetic plates  

NASA Astrophysics Data System (ADS)

Numerical simulations using two hydrocodes were compared to near-field measurements of blast impulse associated with ideal and non-ideal explosives to gain insight into testing results and predict untested configurations. The recently developed kinetic plate test was designed to measure blast impulse in the near-field by firing spherical charges in close range from steel plates and probing plate acceleration using laser velocimetry. Plate velocities for ideal, non-ideal and aluminized explosives tests were modeled using a three dimensional hydrocode. The effects of inert additives in the explosive formulation were modeled using a 1-D hydrocode with multiphase flow capability using Lagrangian particles. The relative effect of particle impact on the plate compared to the blast wave impulse is determined and modeling is compared to free field pressure results.

Neuscamman, S. J.; Manner, V. W.; Brown, G. W.; Glascoe, L. G.

2014-05-01

201

Coal and oil mixture injection into blast furnace  

SciTech Connect

The results of the transportation loop tests indicate that the pressure drop of coal oil mixture (COM) in the pipe can be precisely estimated under the condition that the rheological characteristics of COM are determined by a pseudo-plastic fluid model and the apparent viscosity is measured by the cone and plate viscometer. Through the COM combustion test by LBF it was found that 70 to 85% intected fine coal was combustible in the raceway and there was little difference in the gas permeability between COM and oil injection. The replacement ratio of COM to heavy fuel oil was estimated to be about 0.8 to 0.9 by the mathematical blast furnace simulation model. The injection test into three tuyeres of a large commercial blast furnace has been performed with remarkable success since September 1980. The useful results obtained from these test will be reflected to the commercializing injection test into all tuyeres of Kashima No. 1 blast furnace. 36 figures, 1 table.

Yabe, S.; Kurashige, I.; Miyazaki, T.; Iba, T.; Kojima, M.; Kojima, M.; Shoji, Y.; Kamei, Y.

1981-01-01

202

Preliminary Results of Field Emission Cathode Tests  

NASA Technical Reports Server (NTRS)

Preliminary screening tests of field emission cathodes such as chemical vapor deposited (CVD) diamond, textured pyrolytic graphite, and textured copper were conducted at background pressures typical of electric thruster test facilities to assess cathode performance and stability. Very low power electric thrusters which provide tens to hundreds micronewtons of thrust may need field emission neutralizers that have a capability of tens to hundreds of microamperes. From current voltage characteristics, it was found that the CVD diamond and textured metals cathodes clearly satisfied the Fowler-Nordheim emission relation. The CVD diamond and a textured copper cathode had average current densities of 270 and 380 mA/sq cm, respectively, at the beginning-of-life. After a few hours of operation the cathode emission currents degraded by 40 to 75% at background pressures in the 10(exp -5) Pa to 10(exp -4) Pa range. The textured pyrolytic graphite had a modest current density at beginning-of-life of 84 mA/sq cm, but this cathode was the most stable of all. Extended testing of the most promising cathodes is warranted to determine if current degradation is a burn-in effect or whether it is a long-term degradation process. Preliminary experiments with ferroelectric emission cathodes, which are ceramics with spontaneous electric polarization, were conducted. Peak current densities of 30 to 120 mA/sq cm were obtained for pulse durations of about 500 ns in the 10(exp -4) Pa pressure range.

Sovey, James S.; Kovaleski, Scott D.

2001-01-01

203

Test Results for Fmvss 110. Volume 2. 12 Tests.  

National Technical Information Service (NTIS)

The following automobile and tire combinations were tested for compliance with Federal Motor Vehicle Safety Standard 110: Cougar A, Goodyear Wide Tread; Chevelle G, Uniroyal Laredo; Dodge Monaco, Goodyear Power Cushion; Pontiac Firebird 1, Goodyear Speedw...

1969-01-01

204

Test Results for Fmvss 110. Volume 1. 8 Tests.  

National Technical Information Service (NTIS)

The following automobile and tire combinations were tested for compliance with Federal Motor Vehicle Safety Standard 110: Cougar A, Goodyear Wide Tread; Chevelle G, Uniroyal Laredo; Dodge Monaco, Goodyear Power Cushion; Pontiac Firebird 1, Goodyear Speedw...

1969-01-01

205

Expanded rock blast modeling capabilities of DMC{_}BLAST, including buffer blasting  

Microsoft Academic Search

A discrete element computer program named DMC{_}BLAST (Distinct Motion Code) has been under development since 1987 for modeling rock blasting. This program employs explicit time integration and uses spherical or cylindrical elements that are represented as circles in 2-D. DMC{_}BLAST calculations compare favorably with data from actual bench blasts. The blast modeling capabilities of DMC{_}BLAST have been expanded to include

D. S. Preece; J. P. Tidman; S. H. Chung

1996-01-01

206

Blast furnace reactions  

Microsoft Academic Search

Vast a dvances h ave b een m ade in blast-furnace t echnology d uring t he p ast two decades through p lant t rials and plant d evelopments a ssisted by research to provide b etter u nderstanding of physical and chemical w orkings of the blast f urnace. T he f ields of research have i ncluded

E. T. Turkdogan

1978-01-01

207

Computer cast blast modelling  

Microsoft Academic Search

Cast blasting can be designed to utilize explosive energy effectively and economically for coal mining operations to remove overburden material. The more overburden removed by explosives, the less blasted material there is left to be transported with mechanical equipment, such as draglines and trucks. In order to optimize the percentage of rock that is cast, a higher powder factor than

S. Chung; M. McGill; D. S. Preece

1994-01-01

208

Lightweight blast shield  

DOEpatents

A tandem warhead missile arrangement that has a composite material housing structure with a first warhead mounted at one end and a second warhead mounted near another end of the composite structure with a dome shaped composite material blast shield mounted between the warheads to protect the second warhead from the blast of the first warhead.

Mixon, Larry C. (Madison, AL); Snyder, George W. (Huntsville, AL); Hill, Scott D. (Toney, AL); Johnson, Gregory L. (Decatur, AL); Wlodarski, J. Frank (Huntsville, AL); von Spakovsky, Alexis P. (Huntsville, AL); Emerson, John D. (Arab, AL); Cole, James M. (Huntsville, AL); Tipton, John P. (Huntsville, AL)

1991-01-01

209

A miniature pressure sensor for blast event evaluation  

NASA Astrophysics Data System (ADS)

Traumatic brain injury (TBI) is a great potential threat to people who deal with explosive devices. Protection from TBI has attracted more and more interest. Great efforts have been taken to the studies on the understanding of the propagation of the blast events and its effect on TBI. However, one of the biggest challenges is that the current available pressure sensors are not fast enough to capture the blast wave especially the transient period. This paper reports an ultrafast pressure sensor that could be very useful for analysis of the fast changing blast signal. The sensor is based on Fabry-Perot (FP) principle. It uses a 45º angle polished fiber sitting in a V-groove on a silicon chip. The endface of the angle polished fiber and the diaphragm which is lifted off on the side wall of the V-groove form the FP cavity. The sensor is very small and can be mounted on different locations of a helmet to measure blast pressure simultaneously. The tests were conducted at Natick Soldier Research, Development, and Engineering Center (NSRDEC) in Natick, MA. The sensors were mounted in a shock tube, side by side with the reference sensors, to measure a rapidly increased pressure. The results demonstrated that our sensors' responses agreed well with those from the electrical reference sensors and their response time is comparable.

Wu, Nan; Wang, Wenhui; Tian, Ye; Niezrecki, Christopher; Wang, Xingwei

2011-05-01

210

Nondestructive thermoelectric evaluation of the grit blasting induced effects in metallic biomaterials  

NASA Astrophysics Data System (ADS)

Grit blasting is a surface treatment process widely used to enhance mechanical fixation of the implants through increasing their roughness. Test samples of two metallic biomaterial alloys such 316LVM and Ti6Al4V were blasted by projecting Al2O3 and ZrO2 particles which yield a coarse and a fine rough surface. Then, the blasted samples were thermally treated before and after partial stress relaxation and measured by non-destructive thermoelectric techniques (NDTT), the non-contacting and contacting thermoelectric power (TEP) measurements respectively. It has been found that the TEP measurements are associated directly with the subtle material variations such as cold work and compressive residual stresses due to plastic deformation produced by grit blasting. The TEP measurements clearly demonstrate that the non-contact NDTT technique is very sensitive to the reverse transformation of the ?'-martensite (blasted 316LVM) and the expected relaxation of compressive residual stresses with increasing the severity of the thermal treatment (blasted 316LVM and Ti-6Al-4V), while the contact NDTT results are closely related to grain size refinement and work hardening.

Carreon, H.; Ruiz, A.; Barriuso, S.; González-Carrasco, J. L.; Caballero, F. G.; Lieblich, M.

2013-01-01

211

Study of blast event propagation in different media using a novel ultrafast miniature optical pressure sensor  

NASA Astrophysics Data System (ADS)

Traumatic brain injury (TBI, also called intracranial injury) is a high potential threat to our soldiers. A helmet structural health monitoring system can be effectively used to study the effects of ballistic/blast events on the helmet and human skull to prevent soldiers from TBI. However, one of the biggest challenges lies in that the pressure sensor installed inside the helmet system must be fast enough to capture the blast wave during the transient period. In this paper, an ultrafast optical fiber sensor is presented to measure the blast signal. The sensor is based on a Fabry-Pérot (FP) interferometeric principle. An FP cavity is built between the endface of an etched optical fiber tip and the silica thin diaphragm attached on the end of a multimode optical fiber. The sensor is small enough to be installed in different locations of a helmet to measure blast pressure simultaneously. Several groups of tests regarding multi-layer blast events were conducted to evaluate the sensors' performance. The sensors were mounted in different segments of a shock tube side by side with the reference sensors, to measure a rapidly increasing pressure. The segments of the shock tube were filled with different media. The results demonstrated that our sensors' responses agreed well with those from the electrical reference sensors. In addition, the home-made shock tube could provide a good resource to study the propagation of blast event in different media.

Zou, Xiaotian; Wu, Nan; Tian, Ye; Zhang, Hongtao; Niezrecki, Christopher; Wang, Xingwei

2011-05-01

212

Batch Blast Extractor: an automated blastx parser application  

PubMed Central

Motivation BLAST programs are very efficient in finding similarities for sequences. However for large datasets such as ESTs, manual extraction of the information from the batch BLAST output is needed. This can be time consuming, insufficient, and inaccurate. Therefore implementation of a parser application would be extremely useful in extracting information from BLAST outputs. Results We have developed a java application, Batch Blast Extractor, with a user friendly graphical interface to extract information from BLAST output. The application generates a tab delimited text file that can be easily imported into any statistical package such as Excel or SPSS for further analysis. For each BLAST hit, the program obtains and saves the essential features from the BLAST output file that would allow further analysis. The program was written in Java and therefore is OS independent. It works on both Windows and Linux OS with java 1.4 and higher. It is freely available from:

Pirooznia, Mehdi; Perkins, Edward J; Deng, Youping

2008-01-01

213

Macro-mechanical modelling of blast wave mitigation in foams. Part I: review of available experiments and models  

NASA Astrophysics Data System (ADS)

Multiphase flows, which involve compressible or incompressible fluids with linear or nonlinear dynamics, are found in all areas of technology at all length scales and flow regimes. In this contribution, we discuss application of aqueous-foam barriers against blast wave impact. The first experiments demonstrating this behaviour were conducted in the early 1980s in free-field tests. Based on structural requirements, various foams with different blast energy contents were tested with the aim of characterizing the time history of the blast pressure reduction. A number of consistent methodologies for calculating this pressure reduction in foam are based on the effective gas flow model. For estimating the uncertainties of these methodologies, we briefly demonstrate their comparison with existing experimental data. Thereafter, we present various modifications of modelling approaches and their comparison with new results of blast wave experiments.

Britan, A.; Shapiro, H.; Liverts, M.; Ben-Dor, G.; Chinnayya, A.; Hadjadj, A.

2013-02-01

214

Operation Greenhouse. Scientific Director's report of atomic-weapon tests at Eniwetok, 1951. Annex 4. 2. Measurement of surface-air movements associated with atomic blasts  

SciTech Connect

The purpose of this project was to record continuous measurements of the surface winds in the vicinity of an atomic blast immediately prior to the blast, during passage of the shock wave, and immediately after the blast with special regard to the blast-induced afterwind following local dissipation of the shock wave. From the data obtained, it was concluded that following an atomic explosion there are two specific causes of air-mass movement. One is related to the shock phenomenon and the other to the rising fireball. It can also be concluded that the heated-thermopile-type and strain-gage-type anemometers could be developed to yield more complete data on the air-mass movement at ground level following an atomic explosion.

Rados, R.M.; Bogert, J.C.; Haig, T.O.

1985-09-01

215

Acceleration of Ungapped Extension in Mercury BLAST  

PubMed Central

The amount of biosequence data being produced each year is growing exponentially. Extracting useful information from this massive amount of data efficiently is becoming an increasingly difficult task. There are many available software tools that molecular biologists use for comparing genomic data. This paper focuses on accelerating the most widely used such tool, BLAST. Mercury BLAST takes a streaming approach to the BLAST computation by off loading the performance-critical sections to specialized hardware. This hardware is then used in combination with the processor of the host system to deliver BLAST results in a fraction of the time of the general-purpose processor alone. This paper presents the design of the ungapped extension stage of Mercury BLAST. The architecture of the ungapped extension stage is described along with the context of this stage within the Mercury BLAST system. The design is compact and runs at 100 MHz on available FPGAs, making it an effective and powerful component for accelerating biosequence comparisons. The performance of this stage is 25× that of the standard software distribution, yielding close to 50× performance improvement on the complete BLAST application. The sensitivity is essentially equivalent to that of the standard distribution.

Buhler, Jeremy; Chamberlain, Roger D.

2007-01-01

216

The 757 NLF glove flight test results  

NASA Technical Reports Server (NTRS)

A major concern in the application of a laminar flow wing design to commercial transports is whether laminar flow can be sustained in the presence of the noise environment due to wing mounted turbofan engines. To investigate this issue, a flight test program was conducted using the Boeing 757 flight research airplane with a portion of the wing modified to obtain natural laminar flow. The flight test had two primary objectives. The first was to measure the noise levels on the upper and lower surface of the wing for a range of flight conditions. The second was to investigate the effect of engine noise on laminar boundary layer transition. The noise field on the wing and transition location on the glove were then measured as a function of the engine power setting at a given flight condition. The transition and noise measurement on the glove show that there is no apparent effect of engine noise on the upper surface transition location. On the lower surface, the transition location moved forward 2 to 3 percent chord. A boundary layer stability analysis to the flight data showed that cross flow disturbances were the dominant cause of transition at most flight conditions.

Runyan, L. Jim; Bielak, G. W.; Behbehani, R. A.; Chen, A. W.; Rozendaal, Roger A.

1987-01-01

217

OPERA Resistive Plate Chambers underground test results  

NASA Astrophysics Data System (ADS)

The OPERA experiment [M. Guler et al., CERN/SPSC 2000-028, SPSC/P318, LNGS P25/2000, July 10, 2000; M. Guler et al., CERN/SPSC 2001-025, SPSC/M668, LNGS-EXP 30/2001 Add. 1/01, August 21, 2001] will study ??? oscillations through ? appearance on the 732 Km long CERN to Gran Sasso baseline. The magnet yokes of the two muon spectrometers are instrumented with 44 layers of high resistivity bakelite Resistive Plate Chambers (RPCs) operated in streamer mode. Each layer covers about 70 m2. Four RPC planes were instrumented and the first tests were performed confirming a good behaviour of the installed RPCs in terms of intrinsic noise and operating currents. The measured noise maps agree with those obtained in the extensive quality tests performed at surface. Counting rates are below 20 Hz/m2. Single an multiple cosmic muon tracks were also reconstructed. The estimated efficiency is close to the geometrical limit and the very first measurements of the absolute and differential muon flux are in agreement with expectations.

Bergnoli, A.; Brugnera, R.; Candela, A.; Carrara, E.; Ciesielski, R.; Dal Corso, F.; Degli Esposti, L.; Di Giovanni, A.; D'Incecco, M.; Di Troia, C.; Dusini, S.; Fanin, C.; Felici, G.; Gambarara, A.; Garfagnini, A.; Gatta, M.; Grianti, F.; Gustavino, C.; Lindozzi, M.; Longhin, A.; Mengucci, A.; Monacelli, P.; Paoloni, A.; Stanco, L.; Tatananni, E.; Terranova, F.; Spinetti, M.; Stipcevic, M.; Sugonyaev, V.; Terminiello, L.; Ventura, M.; Votano, L.

2006-08-01

218

Testing Numerical Dynamo Models Against Experimental Results  

NASA Astrophysics Data System (ADS)

Significant progress has been achieved over the past few years in describing the geomagnetic field using computer models for dynamo action. Such models are so far limited to parameter regimes which are very remote from actual values relevant to the Earth core or any liquid metal (the magnetic Prandtl number is always over estimated by a factor at least 104). While existing models successfully reproduce many of the magnetic observations, it is difficult to assert their validity. The recent success of an experimental homogeneous unconstrained dynamo (VKS) provides a new way to investigate dynamo action in turbulent conducting flows, but it also offers a chance to test the validity of exisiting numerical models. We use a code originaly written for the Geodynamo (Parody) and apply it to the experimental configuration. The direct comparison of simulations and experiments is of great interest to test the predictive value of numerical simulations for dynamo action. These turbulent simulations allow us to approach issues which are very relevant for geophysical dynamos, especially the competition between different magnetic modes and the dynamics of reversals.

Gissinger, C. J.; Fauve, S.; Dormy, E.

2007-12-01

219

Simulation of blast-induced, early-time intracranial wave physics leading to traumatic brain injury.  

SciTech Connect

U.S. soldiers are surviving blast and impacts due to effective body armor, trauma evacuation and care. Blast injuries are the leading cause of traumatic brain injury (TBI) in military personnel returning from combat. Understanding of Primary Blast Injury may be needed to develop better means of blast mitigation strategies. The objective of this paper is to investigate the effects of blast direction and strength on the resulting mechanical stress and wave energy distributions generated in the brain.

Taylor, Paul Allen; Ford, Corey C. (University of New Mexico, Albuquerque, NM)

2008-04-01

220

System for supplying blasting media to a media blasting system  

Microsoft Academic Search

This patent describes a pressure pot system for supplying blasting media under pressure to a pressurized blasting conduit for feeding blasting media to one or more blasting guns, the system including a media storage means and a first and second pressure chambers with means for pressurizing and exhausting the first and second chambers, the media storage means being stacked above

Van Kuiken; L. L. Jr

1988-01-01

221

ISO Spread of Flame Test. Round Robin Test Results.  

National Technical Information Service (NTIS)

Construction materials, e.g., plasterboard and rigid PVC, were subjected to flame spread tests. Their ability to produce a horizontal spread on a vertical surface after ignition by an 80 mm blue flame from a 6 mm diameter burner was examined. Ignition tim...

I. Kaiser G. Holmstedt

1981-01-01

222

Laboratory blast wave driven instabilities  

NASA Astrophysics Data System (ADS)

This presentation discusses experiments well-scaled to the blast wave driven instabilities during the explosion phase of SN1987A. Blast waves occur following a sudden, finite release of energy, and consist of a shock front followed by a rarefaction wave. When a blast wave crosses an interface with a decrease in density, hydrodynamic instabilities will develop. These experiments include target materials scaled in density to the He/H layer in SN1987A. About 5 kJ of laser energy from the Omega Laser facility irradiates a 150 ?m plastic layer that is followed by a low density foam layer. A blast wave structure similar to those in supernovae, is created in the plastic layer. The blast wave crosses a perturbed interface, which produces nonlinear, unstable growth dominated by the Rayleigh-Taylor (RT) instability. Recent experiments have been performed using complex initial conditions featuring a three-dimensional interface structure with a wavelength of 71 ?m in two orthogonal directions, at times supplemented by an additional sinusoidal mode of 212 ?m or 424 ?m. We have detected the interface structure under these conditions, using dual orthogonal radiographs on some shots, and will show some of the resulting data. Recent advancements in our x-ray backlighting techniques have greatly improved the resolution of our x-ray radiographic images. Under certain conditions, the improved images show some mass extending beyond the RT spike and penetrating further than previously observed. Current simulations do not show this phenomenon. This presentation will discuss the amount of mass in these spike extensions as well as the error analysis of this calculation. Future experiments will also be discussed. They will be focusing on realistic initial conditions based on 3D stellar evolution models. This research was sponsored by the Stewardship Science Academic Alliances Program through DOE Research Grants DE-FG52-07NA28058, DE-FG52-04NA00064, and other grants and contracts.

Kuranz, Carolyn

2008-04-01

223

Imatinib induces hematologic and cytogenetic responses in patients with chronic myelogenous leukemia in myeloid blast crisis: results of a phase II study  

Microsoft Academic Search

Blast crisis is the most advanced stage of chronic myelogenous leukemia (CML) and is highly refractory to therapy. CML is caused by expression of the chimeric BCR-ABL tyrosine kinase oncogene, the product of the t(9;22) Philadelphia translo- cation. Imatinib (Glivec, formerly STI571) is a rationally developed, orally adminis- tered inhibitor of the Bcr-Abl tyrosine kinase. A total of 260 patients

Charles L. Sawyers; Andreas Hochhaus; Eric Feldman; John M. Goldman; Carole B. Miller; Oliver G. Ottmann; Charles A. Schiffer; Moshe Talpaz; Francois Guilhot; Michael W. N. Deininger; Thomas Fischer; Steve G. O'Brien; Richard M. Stone; Carlo B. Gambacorti-Passerini; Nigel H. Russell; Jose J. Reiffers; Thomas C. Shea; Bernard Chapuis; Steven Coutre; Sante Tura; Enrica Morra; Richard A. Larson; Alan Saven; Christian Peschel; Alois Gratwohl; Franco Mandelli; Monique Ben-Am; Insa Gathmann; Renaud Capdeville; Ronald L. Paquette; Brian J. Druker

224

Flight Test Results for the NICMOS Cryocooler  

NASA Technical Reports Server (NTRS)

In October 1998 a mechanical cryocooler and cryogenic circulator loop were flown on NASA's STS-95 as part of the Hubble Orbital System Test (HOST). The system will be installed on the Hubble Space Telescope (HST) during Service Mission #3 in 2000 and will provide cooling to the Near Infrared Camera and Multi-Object Spectrometer (NICMOS). It will extend the useful life of that instrument by 5 to 10 years. This was the first successful space demonstration of a turbobrayton cryocooler. The cooler is a single stage reverse Brayton type, using low-vibration high-speed miniature turbomachines for the compression and expansion functions. A miniature centrifugal cryogenic circulator is used to deliver refrigerated neon to the instrument. During the mission, the cooler operated without anomalies for approximately 185 hours over a range of conditions to verify its mechanical, thermodynamic and control functions. The cryocooler satisfied all mission objectives including maximum cooldown to near-design operating conditions, warm and cold starts and stops, operation at near-design temperatures, and demonstration of long-term temperature stability. This paper presents a description of the cooler and its operation during the HOST flight.

Dolan, F. X.; McCormick, J. A.; Nellis, G. F.; Sixsmith, H.; Swift, W. L.

1999-01-01

225

Airlift recirculation well test results -- Southern sector  

SciTech Connect

Chlorinated solvents used in the A and M-Areas at the Savannah River Site (SRS) from 1952--1982 have contaminated the groundwater under the site. A plume of groundwater contaminated with trichloroethylene (TCE) and perchloroethylene (PCE) in the Lost Lake aquifer is moving generally southward with the natural flow of groundwater. To comply with the requirements of the current SCDHEC Part B Permit, a series of wells is being installed to contain and treat the plume. Airlift Recirculation Wells (ARW) are a new and innovative technology with potential for more cost effective implementation than conventional pump and treat systems. Two Airlift Recirculation Wells have been installed and tested to quantify performance parameters needed to locate a line of these wells along the leading edge of the contaminant plume. The wells proved to be very sensitive to proper development, but after this requirement was met, performance was very good. The Zone of Capture has been estimated to be within a radius of 130--160 ft. around the wells. Thus a line of wells spaced at 250 ft. intervals could intercept the contaminant plume. At SSR-012, TCE was stripped from the groundwater at approximately 1.2 lb./day. The longer term effect of the recirculation wells upon the plume and the degree of recirculation within the aquifer itself will require additional data over a longer time period for an accurate review. Data collection is ongoing.

White, R.M.; Hiergesell, R.A.

1997-08-01

226

Test results of a prototype dielectric microcalorimeter  

NASA Technical Reports Server (NTRS)

The initial development work on a dielectric microcalorimeter is presented. It focuses on the dielectric properties of the ferroelectric material KTa(1-x)Nb(x)O3 (KTN). Measurements of the temperature dependent dielectric constant are given together with the first alpha particle detection results from a prototype composite microcalorimeter operating at 1.3 K. A nonthermal mechanism for detecting 6 MeV alpha particles in a monolithic KTN sample is also reported.

Pfafman, T. E.; Silver, E.; Labov, S.; Beeman, J.; Goulding, F.; Hansen, W.; Landis, D.; Madden, N.

1990-01-01

227

New blast weapons.  

PubMed

Over the last decade a large number of weapon systems have appeared that use blast as their primary damage mechanism. This is a notable trend; until recently very few warheads relied on blast as their primary output. Most warheads in service use explosives to drive metal such as fragments and shaped charge jets to engage targets. New technologies are now being integrated into warheads that claim to have enhanced blast performance. Blast weapons could have been designed to fill a gap in capability; they are generally used for the attack of 'soft' targets including personnel, both in the open and within protective structures. With the increased number and range of these weapons, it is likely that UK forces will have to face them in future conflicts. This paper briefly describes fuel-air explosive blast weapons and reviews a range of enhanced blast weapons that have been developed recently. The paper concludes with a brief discussion on the reasons why enhanced blast technologies may be proliferating and how this could affect the Defence Medical Services. PMID:11307681

Dearden, P

2001-02-01

228

Passive blast pressure sensor  

SciTech Connect

A passive blast pressure sensor for detecting blast overpressures of at least a predetermined minimum threshold pressure. The blast pressure sensor includes a piston-cylinder arrangement with one end of the piston having a detection surface exposed to a blast event monitored medium through one end of the cylinder and the other end of the piston having a striker surface positioned to impact a contact stress sensitive film that is positioned against a strike surface of a rigid body, such as a backing plate. The contact stress sensitive film is of a type which changes color in response to at least a predetermined minimum contact stress which is defined as a product of the predetermined minimum threshold pressure and an amplification factor of the piston. In this manner, a color change in the film arising from impact of the piston accelerated by a blast event provides visual indication that a blast overpressure encountered from the blast event was not less than the predetermined minimum threshold pressure.

King, Michael J.; Sanchez, Roberto J.; Moss, William C.

2013-03-19

229

Effects of scale on internal blast measurements  

NASA Astrophysics Data System (ADS)

This paper presents a comparative study between large and small-scale internal blast experiments with the goal of using the small-scale analog for energetic performance evaluation. In the small-scale experiment, highly confined explosive samples <0.5 g were subjected to the output from a PETN detonator while enclosed in a 3-liter chamber. Large-scale tests up to 23 kg were unconfined and released in a chamber with a factor of 60,000 increase in volume. The comparative metric in these experiments is peak quasi-static overpressure, with the explosive sample expressed as sample energy/chamber volume, which normalizes measured pressures across scale. Small-scale measured pressures were always lower than the large-scale measurements, because of heat-loss to the high confinement inherent in the small-scale apparatus. This heat-loss can be quantified and used to correct the small-scale pressure measurements. In some cases the heat-loss was large enough to quench reaction of lower energy samples. These results suggest that small-scale internal blast tests do correlate with their large-scale counterparts, provided that heat-loss to confinement can be measured, and that less reactive or lower energy samples are not quenched by heat-loss.

Granholm, R.; Sandusky, H.; Lee, R.

2014-05-01

230

Toxicology of blast overpressure.  

PubMed

Blast overpressure (BOP) or high energy impulse noise, is the sharp instantaneous rise in ambient atmospheric pressure resulting from explosive detonation or firing of weapons. Blasts that were once confined to military and to a lesser extent, occupational settings, are becoming more universal as the civilian population is now increasingly at risk of exposure to BOP from terrorist bombings that are occurring worldwide with greater frequency. Exposure to incident BOP waves can cause auditory and non-auditory damage. The primary targets for BOP damage are the hollow organs, ear, lung and gastrointestinal tract. In addition, solid organs such as heart, spleen and brain can also be injured upon exposure. However, the lung is more sensitive to damage and its injury can lead to death. The pathophysiological responses, and mortality have been extensively studied, but little attention, was given to the biochemical manifestations, and molecular mechanism(s) of injury. The injury from BOP has been, generally, attributed to its external physical impact on the body causing internal mechanical damage. However, a new hypothesis has been proposed based on experiments conducted in the Department of Respiratory Research, Walter Reed Army Institute of Research, and later in the Department of Occupational Health, University of Pittsburgh. This hypothesis suggests that subtle biochemical changes namely, free radical-mediated oxidative stress occur and contribute to BOP-induced injury. Understanding the etiology of these changes may shed new light on the molecular mechanism(s) of injury, and can potentially offer new strategies for treatment. In this symposium. BOP research involving auditory, non-auditory, physiological, pathological, behavioral, and biochemical manifestations as well as predictive modeling and current treatment modalities of BOP-induced injury are discussed. PMID:9217311

Elsayed, N M

1997-07-25

231

12 CFR 325.207 - Publication of stress test results.  

...2014-01-01 2014-01-01 false Publication of stress test results. 325.207 Section 325.207...GENERAL POLICY CAPITAL MAINTENANCE Annual Stress Test § 325.207 Publication of stress test results. (a) Publication...

2014-01-01

232

12 CFR 252.148 - Disclosure of stress test results.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Disclosure of stress test results. 252.148 Section...STANDARDS (REGULATION YY) Company-Run Stress Test Requirements for Covered Companies § 252.148 Disclosure of stress test results. (a) Public...

2013-01-01

233

12 CFR 252.147 - Reports of stress test results.  

... 2014-01-01 false Reports of stress test results. 252.147 Section...STANDARDS (REGULATION YY) Company-Run Stress Test Requirements for Covered Companies § 252.147 Reports of stress test results. (a) Reports to...

2014-01-01

234

12 CFR 325.207 - Publication of stress test results.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false Publication of stress test results. 325.207 Section 325.207...GENERAL POLICY CAPITAL MAINTENANCE Annual Stress Test § 325.207 Publication of stress test results. (a) Publication...

2013-01-01

235

12 CFR 252.157 - Disclosure of stress test results.  

...2014-01-01 false Disclosure of stress test results. 252.157 Section 252...STANDARDS (REGULATION YY) Company-Run Stress Test Requirements for Banking Organizations...Companies § 252.157 Disclosure of stress test results. (a) Public...

2014-01-01

236

12 CFR 252.148 - Disclosure of stress test results.  

...2014-01-01 false Disclosure of stress test results. 252.148 Section...STANDARDS (REGULATION YY) Company-Run Stress Test Requirements for Covered Companies § 252.148 Disclosure of stress test results. (a) Public...

2014-01-01

237

12 CFR 252.157 - Disclosure of stress test results.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Disclosure of stress test results. 252.157 Section 252...STANDARDS (REGULATION YY) Company-Run Stress Test Requirements for Banking Organizations...Companies § 252.157 Disclosure of stress test results. (a) Public...

2013-01-01

238

12 CFR 252.147 - Reports of stress test results.  

Code of Federal Regulations, 2013 CFR

... 2013-01-01 false Reports of stress test results. 252.147 Section...STANDARDS (REGULATION YY) Company-Run Stress Test Requirements for Covered Companies § 252.147 Reports of stress test results. (a) Reports to...

2013-01-01

239

Detection of Blast-Related Traumatic Brain Injury in U.S. Military Personnel.  

National Technical Information Service (NTIS)

Blast-related traumatic brain injuries have been common in the Iraq and Afghanistan wars, but fundamental questions about the nature of these injuries remain unanswered. Methods We tested the hypothesis that blast-related traumatic brain injury causes tra...

A. M. Johnson C. L. Mac Donald D. Cooper E. C. Nelson N. J. Werner

2011-01-01

240

Stirling convertor performance mapping test results  

NASA Astrophysics Data System (ADS)

The Department of Energy (DOE) has selected Free-Piston Stirling Convertors as a technology for future advanced radioisotope space power systems. In August 2000, DOE awarded competitive Phase I, Stirling Radioisotope Generator (SRG) power system integration contracts to three major aerospace contractors, resulting in SRG conceptual designs in February 2001. All three contractors based their designs on the Technology Demonstration Convertor (TDC) developed by Stirling Technology Company (STC) for DOE. The contract award to a single system integration contractor for Phases II and III of the SRG program is anticipated in late 2001. The first potential SRG mission is targeted for a Mars rover. Recent TDC performance data are provided in this paper, together with predictions from Stirling simulation models. .

Qiu, Songgang; Peterson, Allen A.; White, Maurice A.; Faultersack, Franklyn; Redinger, Darin L.; Petersen, Stephen L.

2002-01-01

241

Computation of viscous blast wave flowfields  

NASA Technical Reports Server (NTRS)

A method to determine unsteady solutions of the Navier-Stokes equations was developed and applied. The structural finite-volume, approximately factored implicit scheme uses Newton subiterations to obtain the spatially and temporally second-order accurate time history of the interaction of blast-waves with stationary targets. The inviscid flux is evaluated using MacCormack's modified Steger-Warming flux or Roe flux difference splittings with total variation diminishing limiters, while the viscous flux is computed using central differences. The use of implicit boundary conditions in conjunction with a telescoping in time and space method permitted solutions to this strongly unsteady class of problems. Comparisons of numerical, analytical, and experimental results were made in two and three dimensions. These comparisons revealed accurate wave speed resolution with nonoscillatory discontinuity capturing. The purpose of this effort was to address the three-dimensional, viscous blast-wave problem. Test cases were undertaken to reveal these methods' weaknesses in three regimes: (1) viscous-dominated flow; (2) complex unsteady flow; and (3) three-dimensional flow. Comparisons of these computations to analytic and experimental results provided initial validation of the resultant code. Addition details on the numerical method and on the validation can be found in the appendix. Presently, the code is capable of single zone computations with selection of any permutation of solid wall or flow-through boundaries.

Atwood, Christopher A.

1991-01-01

242

Indoor human response to blast sounds that generate rattles.  

PubMed

The two major noise sources that cause environmental problems for the U. S. Army are helicopters and large weapons such as artillery, tanks, and demolition. These large weapons produce blast sounds that contain little energy above 200 Hz and that are particularly troublesome to deal with because they excite rattles in structures. The purpose of this study was to systematically test subjective response to the presence or absence of rattles in otherwise similar blast sound environments. A second purpose of the study was to test if there were structural changes that could reduce annoyance within the indoor blast sound environment. This study was done using a specially constructed test house and highly repeatable shake table to generate the blast sounds. The data clearly show that no commonly used environmental noise measure adequately describes the indoor environment when the blast excites rattles. Although the indoor blast ASEL changes by only about a decibel or so (and the indoor blast CSEL changes by even less), the subjective response changes by up to 13 dB. At low blast levels, the increase in human annoyance response is largest, and this annoyance response offset decreases to about 6 dB when the outside, flat-weighted peak sound-pressure level of the blast increases from 112 to 122 dB. PMID:2768676

Schomer, P D; Averbuch, A

1989-08-01

243

U.S. Army RDECOM-ARDEC's results of the TG-53 experiment and field test  

NASA Astrophysics Data System (ADS)

Herein is described the U.S. Army RDECOM-ARDEC's purpose and series of activities conducted at the 2008 NATO SET-093 TG-53 experiment and field test. The overall purpose of the field test as stated by SET-093 panel was to provide a baseline test capable of providing relevant scenarios and data regarding a variety of impulsive generated acoustic events. As organized, the field experiment also allowed the room o study sensor interoperability across multiple platforms and multi-national users via the spider communication framework/reporting structure. This multinational network maintained by the host ETBS with a standardized messaging format with specific goals for each participating organization. ARDEC's role and purpose for the test was to provide situational awareness via the Spider and associated messaging format to the ETBS command center while continuing to gather unique acoustic data from various vantage points. ARDEC had several deliverables for the TG-53 field experiment derived from the mission and spirit of the field test. The most relevant deliverable was to demonstrate sensor interoperability via the Spider network and provide situational awareness by describing the said mortar/artillery events. The second purpose revolved around a relevant environment algorithm validation of the muzzle blast discrimination for future UGS transition in particular the UTAMS II. The algorithm validation information remained internal to the specific data acquisition system and not broadcasted out on the Spider network. The TG-53 field experiments provided the added opportunity to further test and refine the algorithm based on the discrete wavelet transform (DWT) and multiresolution analysis. These techniques are used to classify and reliably discriminates between launch and impact artillery and/or mortar events via acoustic signals produced during detonation. Distinct characteristics are found within the acoustic signatures since impact events emphasize concussive and shrapnel effects, while launch events are similar to explosions, designed to expel and propel an artillery round from a gun. The ensuing signatures are readily characterized by variations in the corresponding peak pressure and rise time of the waveform, differences in the ratio of positive pressure amplitude to the negative amplitude, variations in the prominent frequencies associated with the blast events and variations in the overall duration of the resulting waveform. Unique attributes can also be identified that depend upon the properties of the gun tube, projectile speed at the muzzle, and the explosive/concussive properties associated with the events. The event allows the examination of particular extreme battlefield acoustic challenges not normally documented or readily studied. The final portion will focus on the unique acoustic signatures data collected and how it allowed very relevant situations to be tested in a variety of scenarios.

Desai, Sachi V.; Morcos, Amir

2009-05-01

244

Software Verification with BLAST  

Microsoft Academic Search

Abstract: Introduction. Blast (the Berkeley Lazy Abstraction Software verificationTool) is a verification system for checking safety properties of C programs usingautomatic property-driven construction and model checking of software abstractions. Blast implements an abstract-model check-refine loop to check forreachability of a specified label in the program. The abstract model is built onthe fly using predicate abstraction. This model is then checked

Thomas A. Henzinger; Ranjit Jhala; Rupak Majumdar; Grégoire Sutre

2003-01-01

245

Prediction of ground vibrations resulting from the blasting operations in an open-pit mine by adaptive neuro-fuzzy inference system  

NASA Astrophysics Data System (ADS)

The aim of this study is to predict the peak particle velocity (PPV) values from both presently constructed simple regression model and fuzzy-based model. For this purpose, vibrations induced by bench blasting operations were measured in an open-pit mine operated by the most important magnesite producing company (MAS) in Turkey. After gathering the ordered pairs of distance and PPV values, the site-specific parameters were determined using traditional regression method. Also, an attempt has been made to investigate the applicability of a relatively new soft computing method called as the adaptive neuro-fuzzy inference system (ANFIS) to predict PPV. To achieve this objective, data obtained from the blasting measurements were evaluated by constructing an ANFIS-based prediction model. The distance from the blasting site to the monitoring stations and the charge weight per delay were selected as the input parameters of the constructed model, the output parameter being the PPV. Valid for the site, the PPV prediction capability of the constructed ANFIS-based model has proved to be successful in terms of statistical performance indices such as variance account for (VAF), root mean square error (RMSE), standard error of estimation, and correlation between predicted and measured PPV values. Also, using these statistical performance indices, a prediction performance comparison has been made between the presently constructed ANFIS-based model and the classical regression-based prediction method, which has been widely used in the literature. Although the prediction performance of the regression-based model was high, the comparison has indicated that the proposed ANFIS-based model exhibited better prediction performance than the classical regression-based model.

Iphar, Melih; Yavuz, Mahmut; Ak, Hakan

2008-11-01

246

Extracellular cyclophilin A protects against blast-induced neuronal injury.  

PubMed

Blast-induced traumatic brain injury (TBI) and subsequent neurobehavioral deficits are major disabilities suffered by the military and civilian population worldwide. Rigorous scientific research is underway to understand the mechanism of blast TBI and thereby develop effective therapies for protection and treatment. By using an in vitro shock tube model of blast TBI with SH-SY5Y human neuroblastoma cells, we have demonstrated that blast exposure leads to neurobiological changes in an overpressure and time dependent manner. Paradoxically, repeated blast exposures resulted in less neuronal injury compared to single blast exposure and suggested a potential neuroprotective mechanism involving released cyclophilin A (CPA). In the present study, we demonstrate accumulation of CPA in the culture medium after repeated blast exposures supporting the notion of extracellular CPA mediated neuroprotection. Post-exposure treatment of the cells with purified recombinant CPA caused significant protection against blast-induced neuronal injury. Furthermore, repeated blast exposure was associated with phosphorylation of the proteins ERK1/2 and Bad suggesting a potential mechanism of neuroprotection by extracellular CPA and may aid in the development of targeted therapies for protection against blast-induced TBI. PMID:23511555

Arun, Peethambaran; Abu-Taleb, Rania; Valiyaveettil, Manojkumar; Wang, Ying; Long, Joseph B; Nambiar, Madhusoodana P

2013-01-01

247

Paint removal using wheat starch blast media  

NASA Astrophysics Data System (ADS)

A review of the Wheat Starch Blasting technology is presented. Laboratory evaluations covering Almen Arc testing on bare 2024-T3 aluminum and magnesium, as well as crack detection on 7075-T6 bare aluminum, are discussed. Comparisons with Type V plastic media show lower residual stresses are achieved on aluminum and magnesium with wheat starch media. Dry blasting effects on the detection of cracks confirms better crack visibility with wheat starch media versus Type V or Type II plastic media. Testing of wheat starch media in several composite test programs, including fiberglass, Kevlar, and graphite-epoxy composites, showed no fiber damage. Process developments and production experience at the first U.S. aircraft stripping facility are also reviewed. Corporate and regional aircraft are being stripped in this three nozzle dry blast hanger.

Foster, Terry; Oestreich, John

1993-03-01

248

Dust explosion hazards due to blasting of oil shale  

SciTech Connect

The conditions favoring secondary explosions of dust or gas accompanying the blasting of oil shale are the subject of continuing investigation by the Bureau of Mines. In the present study, oil shale dust was dispersed in a gallery and ignited by various blasting agents blown out of a cannon according to a standard testing procedure. Parallel tests were conducted in the Bureau's Experimental Mine to test propagation as well as ignition of oil shale dust. In both gallery and mine, the minimum explosion limits were determined as a function of dust loading, weight and type of blasting agent, and amount of added methane. The results of these experiments are compared with previous measurements using methane-air explosions as an initiation source. In view of recent mine dust sampling data, the main explosion hazard in nongassy oil shale mines is likely to be limited to the region of the face. But in gassy mines, dust-gas explosions could be expected to propagate considerable distances.

Richmond, J.K.; Beitel, F.P.

1984-04-01

249

Methods for predicting rubble motion during blasting  

SciTech Connect

Recent applications of explosives and blasting agents to rubble rock have led to requirements for more elaborate design and analysis methods. Many in situ extraction techniques require rubblization to take place in a confined region where rock motion is a predominate factor in creating a permeable broken bed. Two analytical methods are presented which describe the large rubble motion during blasting. These methods are intended to provide the blast designer with a tool for evaluation and further refinement of blasting patterns and timing sequences. In both these methods, the rock medium is represented by a series of discrete, discontinuous regions (bodies, masses). The use of discontinuous techniques rather than the classical continuum methods, results in better approximations to the rubble motion. These regions are set in motion by pressure loads from the explosive. The motion of these regions is then calculated numerically using interaction laws between regions in contact. The basis for these models or methods is presented along with the background for selecting explosive pressure loads and rock mass material behavior. Typical examples, including both cratering and bench blasting geometries, are discussed which illustrate the use of these models to predict rubble motion. Such engineering representations appear to provide a practical method for use in predicting rubble motion and a tool for design evaluation of blasting in confined geometries.

Schamaun, J.T.

1984-03-01

250

Measuring Uncertainty and Conservatism in Simplified Blast Models.  

National Technical Information Service (NTIS)

This paper compares blast predictions (both reflected and incident loads, both for pressure and impulse, and both positive and negative phases) from a number of popular simplified models, including BlastX, ConWep, SHOCK, to a wide range of test data spann...

D. Bogosian J. Ferritto Y. Shi

2002-01-01

251

Improved comminution efficiency through controlled blasting during mining  

Microsoft Academic Search

Improved comminution efficiencies of material that had been blasted utilizing regular burden and spacing distances and that which had been blasted utilizing a reduction in burden and spacing distance of 25% are compared. Single particle impact tests showed that fracture stress and fracture energy are about 15% less for the reduced burden and spacing material. Single particle roll mill crushing

G. Chi; M. C. Fuerstenau; R. C. Bradt; A. Ghosh

1996-01-01

252

Dynamics and Afterglow Light Curves of Gamma-Ray Burst Blast Waves Encountering a Density Bump or Void  

NASA Astrophysics Data System (ADS)

We investigate the dynamics and afterglow light curves of gamma-ray burst blast waves that encounter various density structures (such as bumps, voids, or steps) in the surrounding ambient medium. We present and explain the characteristic response features that each type of density structure in the medium leaves on the forward shock (FS) and reverse shock (RS) dynamics for blast waves with either a long-lived or short-lived RS. We show that when the ambient medium density drops, the blast waves exhibit in some cases a period of an actual acceleration (even during their deceleration stage) due to adiabatic cooling of blast waves. Comparing numerical examples that have different shapes of bumps or voids, we propose a number of consistency tests that must be satisfied by correct modeling of blast waves. Our model results successfully pass these tests. Employing a Lagrangian description of blast waves, we perform a sophisticated calculation of afterglow emission. We show that as a response to density structures in the ambient medium, the RS light curves produce more significant variations than the FS light curves. Some observed features (such as rebrightenings, dips, or slow wiggles) can be more easily explained within the RS model. We also discuss the origin of these different features imprinted on the FS and RS light curves.

Uhm, Z. Lucas; Zhang, Bing

2014-07-01

253

Modelling the combustion of charcoal in a model blast furnace  

NASA Astrophysics Data System (ADS)

The pulverized charcoal (PCH) combustion in ironmaking blast furnaces is abstracting remarkable attention due to various benefits such as lowering CO2 emission. In this study, a three-dimensional CFD model is used to simulate the flow and thermo-chemical behaviours in this process. The model is validated against the experimental results from a pilot-scale combustion test rig for a range of conditions. The typical flow and thermo-chemical phenomena is simulated. The effect of charcoal type, i.e. VM content is examined, showing that the burnout increases with VM content in a linear relationship. This model provides an effective way for designing and optimizing PCH operation in blast furnace practice.

Shen, Yansong; Shiozawa, Tomo; Yu, Aibing; Austin, Peter

2013-07-01

254

Strength and pore structure of ternary blended cement mortars containing blast furnace slag and silica fume  

Microsoft Academic Search

Blended cement mortars with fixed workability and incorporating blast furnace slag and silica fume, were tested for compressive strength and mercury intrusion, with a view to comparing their performance with that of plain Portland cement mortar and\\/or slag-cement mortar. The obtained results showed that with high portions of slag and silica fume in the binding system, the mortars reached relatively

L. Bágel

1998-01-01

255

Proceedings of the twenty-second annual conference on explosives and blasting technique. Volume 2  

SciTech Connect

This conference proceedings presents approximately 22 papers which have been individually indexed and abstracted. Papers deal primarily with blast pattern planning and effects, rock mechanics associated with drilling and explosive fracturing, and optimization of drilling. Papers also deal with the actual explosives, their performance, effects of fuel-oil mixtures, effects of water, and results of performance testing of various explosives.

NONE

1996-12-31

256

Plasma Discharge Initiation of Explosives in Rock Blasting Application: A Case Study  

NASA Astrophysics Data System (ADS)

A plasma discharge initiation system for the explosive volumetric combustion charge was designed, investigated and developed for practical application. Laboratory scale experiments were carried out before conducting the large scale field tests. The resultant explosions gave rise to less noise, insignificant seismic vibrations and good specific explosive consumption for rock blasting. Importantly, the technique was found to be safe and environmentally friendly.

Jae-Ou, Chae; Young-Jun, Jeong; V, M. Shmelev; A, A. Denicaev; V, M. Poutchkov; V, Ravi

2006-07-01

257

Assessment of Atmospheric Emissions from Quenching of Blast Furnace Slag with Blast Furnace Blowdown Water.  

National Technical Information Service (NTIS)

The report gives results of 15 emission measurements made on a laboratory scale facility simulating typical plant slag quenching practice. The measurements were made to determine if a potential alternative to treatment prior to discharge of blast furnace ...

G. Annamraju W. Kemner P. J. Schworer

1984-01-01

258

Electrocardiographic changes following primary blast injury to the thorax.  

PubMed

Profound physiological changes occur following primary blast exposure but the contribution of cardiac arrhythmias is unknown. Thirteen rats, under intravenous anaesthesia, were exposed to a blast wave directed at the thorax (Group II); 10 other animals underwent abdominal blast (Group III) and nine animals acted as controls (Group I). Animals were monitored before, during and after blast exposure. Group II animals demonstrated apnoea, bradycardia and hypotension. No significant physiological changes were seen in Groups I or III. Group II displayed a variety of ECG disturbances, from ventricular extrasystoles to ventricular fibrillation. All abnormalities reverted to sinus rhythm within minutes except in fatally injured animals. These ECG changes probably result from stress wave injury. Significant disturbances might account for some fatalities following primary blast exposure and may exacerbate the triad of apnoea, bradycardia and hypotension. Such observations may have important consequences for the management of blast casualties. PMID:11346922

Guy, R J; Watkins, P E; Edmondstone, W M

2000-01-01

259

GOES Type III Loop Heat Pipe Life Test Results  

NASA Technical Reports Server (NTRS)

The GOES Type III Loop Heat Pipe (LHP) was built as a life test unit for the loop heat pipes on the GOES N-Q series satellites. This propylene LHP was built by Dynatherm Corporation in 2000 and tested continuously for approximately 14 months. It was then put into storage for 3 years. Following the storage period, the LHP was tested at Swales Aerospace to verify that the loop performance hadn t changed. Most test results were consistent with earlier results. At the conclusion of testing at Swales, the LHP was transferred to NASA/GSFC for continued periodic testing. The LHP has been set up for testing in the Thermal Lab at GSFC since 2006. A group of tests consisting of start-ups, power cycles, and a heat transport limit test have been performed every six to nine months since March 2006. Tests results have shown no change in the loop performance over the five years of testing. This presentation will discuss the test hardware, test set-up, and tests performed. Test results to be presented include sample plots from individual tests, along with conductance measurements for all tests performed.

Ottenstein, Laura

2011-01-01

260

Copper staves in the blast furnace  

SciTech Connect

Operational data for stave cooling systems for two German blast furnaces show good correlation with predicted thermal results. Copper staves have been installed in blast furnaces in the zones exposed to the highest thermal loads. The good operational results achieved confirm the choice of copper staves in the areas of maximum heat load. Both temperature measurements and predictions establish that the MAN GHH copper staves do not experience large temperature fluctuations and that the hot face temperatures will be below 250 F. This suggests that the copper staves maintain a more stable accretion layer than the cast iron staves. Contrary to initial expectations, heat flux to the copper staves is 50% lower than that to cast iron staves. The more stable accretion layer acts as an excellent insulator for the stave and greatly reduces the number of times the hot face of the stave is exposed to the blast furnace process and should result in a more stable furnace operation. In the future, it may be unnecessary to use high quality, expensive refractories in front of copper staves because of the highly stable accretion layer that appears to rapidly form due to the lower operating temperature of the staves. There is a balance of application regions for cast iron and copper staves that minimizes the capital cost of a blast furnace reline and provides an integrated cooling system with multiple campaign life potential. Cast iron staves are proven cooling elements that are capable of multiple campaign life in areas of the blast furnace which do not experience extreme heat loads. Copper staves are proving to be an effective and reliable blast furnace cooling element that are subject to virtually no wear and are projected to have a longer campaign service life in the areas of highest thermal load in the blast furnace.

Helenbrook, R.G. [ATSI, Inc., Amherst, NY (United States); Kowalski, W. [Thyssen Stahl AG, Duisburg (Germany); Grosspietsch, K.H. [Preussag Stahl AG, Saltzgitter (Germany); Hille, H. [MAN GHH AG, Oberhausen (Germany)

1996-08-01

261

Effects of Testing Conditions on Conceptual Survey Results  

ERIC Educational Resources Information Center

Pre-testing and post-testing is a commonly used method in Physics Education Research to assess student learning gains. It is well recognized in the community that timings and incentives in delivering conceptual tests can impact test results. However, it is difficult to control these variables across different studies. As a common practice, a…

Ding, Lin; Reay, Neville W.; Lee, Albert; Bao, Lei

2008-01-01

262

Making Sense of Your Pap and HPV Test Results  

MedlinePLUS

Making Sense of Your Pap and HPV Test Results This page is for women who got screened for cervical cancer with a Pap test and an HPV test. It will help ... same symptoms or health problems. Cervical Cancer Screening Tests One important way to prevent cervical cancer is ...

263

30 CFR 56.6407 - Circuit testing.  

Code of Federal Regulations, 2013 CFR

... Explosives Electric Blasting § 56.6407 Circuit testing. ...testing blasting circuits shall be used...Continuity of each electric detonator in...connection of electric detonator series...Total blasting circuit resistance...

2013-07-01

264

Secondary Waves from Nozzle Blast.  

National Technical Information Service (NTIS)

Blast signatures at the gunner's position produced by recoilless rifles and rocket launchers often exhibit a strong secondary wave following chamber blowdown. To identify its source a series of experiments was performed using a helium-driven blast simulat...

G. C. Carofano

1984-01-01

265

12 CFR 252.156 - Reports of stress test results.  

... 2014-01-01 false Reports of stress test results. 252.156 Section 252...STANDARDS (REGULATION YY) Company-Run Stress Test Requirements for Banking Organizations...Covered Companies § 252.156 Reports of stress test results. (a) Reports to...

2014-01-01

266

12 CFR 252.156 - Reports of stress test results.  

Code of Federal Regulations, 2013 CFR

... 2013-01-01 false Reports of stress test results. 252.156 Section 252...STANDARDS (REGULATION YY) Company-Run Stress Test Requirements for Banking Organizations...Covered Companies § 252.156 Reports of stress test results. (a) Reports to...

2013-01-01

267

Estimation of the power of the Chelyabinsk meteoroid blast from optical, seismic, and infrasonic observation data  

NASA Astrophysics Data System (ADS)

The power of the Chelyabinsk meteoroid blast is estimated from model calculations and the results of optic, seismic, and infrasonic observations. The power of the blast has been determined as 1-3 kt of TNT.

Krasnov, V. M.; Drobzheva, Ya. V.; Salikhov, N. M.; Zhumabaev, B. T.; Lazurkina, V. B.

2014-03-01

268

Recommendations for a New and Improved ORCA Modeling System Blast Module.  

National Technical Information Service (NTIS)

The blast module of the Operational Requirement-based Casualty Assessment (ORCA) modeling system computer software package was reviewed and compared to the WRAIR blast injury model (INJURY). As a result, recommendations are presented in this report to imp...

O. P. Litt

2004-01-01

269

Mechanisms of Hearing Loss after Blast Injury to the Ear  

PubMed Central

Given the frequent use of improvised explosive devices (IEDs) around the world, the study of traumatic blast injuries is of increasing interest. The ear is the most common organ affected by blast injury because it is the body’s most sensitive pressure transducer. We fabricated a blast chamber to re-create blast profiles similar to that of IEDs and used it to develop a reproducible mouse model to study blast-induced hearing loss. The tympanic membrane was perforated in all mice after blast exposure and found to heal spontaneously. Micro-computed tomography demonstrated no evidence for middle ear or otic capsule injuries; however, the healed tympanic membrane was thickened. Auditory brainstem response and distortion product otoacoustic emission threshold shifts were found to be correlated with blast intensity. As well, these threshold shifts were larger than those found in control mice that underwent surgical perforation of their tympanic membranes, indicating cochlear trauma. Histological studies one week and three months after the blast demonstrated no disruption or damage to the intra-cochlear membranes. However, there was loss of outer hair cells (OHCs) within the basal turn of the cochlea and decreased spiral ganglion neurons (SGNs) and afferent nerve synapses. Using our mouse model that recapitulates human IED exposure, our results identify that the mechanisms underlying blast-induced hearing loss does not include gross membranous rupture as is commonly believed. Instead, there is both OHC and SGN loss that produce auditory dysfunction.

Cho, Sung-Il; Gao, Simon S.; Xia, Anping; Wang, Rosalie; Salles, Felipe T.; Raphael, Patrick D.; Abaya, Homer; Wachtel, Jacqueline; Baek, Jongmin; Jacobs, David; Rasband, Matthew N.; Oghalai, John S.

2013-01-01

270

Mechanisms of hearing loss after blast injury to the ear.  

PubMed

Given the frequent use of improvised explosive devices (IEDs) around the world, the study of traumatic blast injuries is of increasing interest. The ear is the most common organ affected by blast injury because it is the body's most sensitive pressure transducer. We fabricated a blast chamber to re-create blast profiles similar to that of IEDs and used it to develop a reproducible mouse model to study blast-induced hearing loss. The tympanic membrane was perforated in all mice after blast exposure and found to heal spontaneously. Micro-computed tomography demonstrated no evidence for middle ear or otic capsule injuries; however, the healed tympanic membrane was thickened. Auditory brainstem response and distortion product otoacoustic emission threshold shifts were found to be correlated with blast intensity. As well, these threshold shifts were larger than those found in control mice that underwent surgical perforation of their tympanic membranes, indicating cochlear trauma. Histological studies one week and three months after the blast demonstrated no disruption or damage to the intra-cochlear membranes. However, there was loss of outer hair cells (OHCs) within the basal turn of the cochlea and decreased spiral ganglion neurons (SGNs) and afferent nerve synapses. Using our mouse model that recapitulates human IED exposure, our results identify that the mechanisms underlying blast-induced hearing loss does not include gross membranous rupture as is commonly believed. Instead, there is both OHC and SGN loss that produce auditory dysfunction. PMID:23840874

Cho, Sung-Il; Gao, Simon S; Xia, Anping; Wang, Rosalie; Salles, Felipe T; Raphael, Patrick D; Abaya, Homer; Wachtel, Jacqueline; Baek, Jongmin; Jacobs, David; Rasband, Matthew N; Oghalai, John S

2013-01-01

271

49 CFR 199.109 - Review of drug testing results.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 false Review of drug testing results. 199...AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT...CONTINUED) PIPELINE SAFETY DRUG AND ALCOHOL TESTING...MRO must be a licensed physician who has the...

2010-10-01

272

49 CFR 199.109 - Review of drug testing results.  

Code of Federal Regulations, 2010 CFR

...2009-10-01 false Review of drug testing results. 199...AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT...CONTINUED) PIPELINE SAFETY DRUG AND ALCOHOL TESTING...MRO must be a licensed physician who has the...

2009-10-01

273

Test results of the DOE/Sandia 17 meter VAWT  

NASA Technical Reports Server (NTRS)

A review is given of the test program of a 17 meter Vertical Axis Wind Turbine VAWT. Performance test results are discussed including difficulties encountered during the VAWT operation along with ways of solving these problems.

Nellums, R. O.; Worstell, M. H.

1979-01-01

274

Nanoenhanced polyurea as a blast resistant coating for concrete masonry walls  

NASA Astrophysics Data System (ADS)

Blast impact is a major concern in the world today. The leading cause of death due to blast impacts is rapidly moving debris. To prevent this many researchers are looking for methods of improved blast resistance for concrete masonry walls. However, many available protective coatings are not flame retardant. This thesis focuses on nanoenhanced polyurea for applications in improving blast resistance, while possessing improved flame retardancy, of concrete masonry walls. The polyurea that is being researched is enhanced with nanoadditives in an effort improve both blast and fire resistance. These materials are dynamically tested and those showing marked improvement are chosen for experimental and computational testing.

Rivera, Heather Kathryn Daniell

275

Effects of testing conditions on conceptual survey results  

NSDL National Science Digital Library

Pre-testing and post-testing is a commonly used method in Physics Education Research to assess student learning gains. It is well recognized in the community that timings and incentives in delivering conceptual tests can impact test results. However, it is difficult to control these variables across different studies. As a common practice, a pre-test is often administered either at or near the beginning of a course, while a post-test can be given either at or near the end of a course. Also, in conducting such tests there often is no norm as to whether incentives should be offered to students. Because these variations can significantly affect test results, it is important to study and document their impact. We analyzed five years of data that were collected at The Ohio State University from over 2100 students, who took both the pre-test and post-test of the Conceptual Survey of Electricity and Magnetism under various timings and incentives. We observed that the actual time frame for giving a test has a marked effect on the test results and that incentive granting also has a significant influence on test outcomes. These results suggest that one should carefully monitor and document the conditions under which tests are administered.

Ding, Lin; Reay, Neville W.; Lee, Albert; Bao, Lei

2008-09-22

276

Space Shuttle Solid Rocket Booster decelerator subsystem drop test results  

NASA Technical Reports Server (NTRS)

An air drop test program was conducted as part of the development of a decelerator subsystem for recovering the Space Shuttle Solid Rocket Booster. This development test program consisted of six drops performed over the period from June 1977 to September 1978 at a parachute test center in California. The testing concerned a 48,000-lb drop test vehicle released from the B-52 mothership. The drop test program is described and pertinent test results are discussed. Data include snatch loads, inflation characteristics, peak inflation and disreef loads, and drag performance. Performance characteristics of the drogue parachute and the main parachute are established.

Moog, R. D.; Sheppard, J. D.; Kross, D. A.

1979-01-01

277

An experimental study on corrosion resistance of concrete with ground granulate blast-furnace slag  

Microsoft Academic Search

This paper presents experimental test results on corrosion resistance of concrete containing ground granulate blast-furnace slag (GGBS) and ASTM Type I or ASTM Type V cement. To investigate the problem, a series of tests were performed. First, rapid chloride permeability tests were executed in accordance with ASTM C 1202 to determine the qualitative terms of chloride-ion penetrability. Second, accelerated chloride-ion

Kyong Yun Yeau; Eun Kyum Kim

2005-01-01

278

Advanced MRI in Blast-related TBI.  

National Technical Information Service (NTIS)

The purpose of the research effort was to test two advanced MRI methods, DTI and resting-state fMRI, in active-duty military blast-related TBI patients acutely after injury and correlate findings with TBI-related clinical outcomes 6-12 months later. The g...

D. L. Brody

2012-01-01

279

A Statistical Analysis of Fragmentation After Single Hole Bench Blasting  

Microsoft Academic Search

Summary   The purpose of this study is to statistically correlate the fragmentation gradient () and average fragment size () with the blasting test parameters for rock masses having different characteristics. Blasting tests were conducted in limestone\\u000a exposed during the highway construction between Tarsus and Pozanti (Turkey). Three test sites were classified as poor rock,\\u000a good rock, and very good rock

M. G. ?enyur

1998-01-01

280

Natural rice rhizospheric microbes suppress rice blast infections  

PubMed Central

Background The natural interactions between plant roots and their rhizospheric microbiome are vital to plant fitness, modulating both growth promotion and disease suppression. In rice (Oryza sativa), a globally important food crop, as much as 30% of yields are lost due to blast disease caused by fungal pathogen Magnaporthe oryzae. Capitalizing on the abilities of naturally occurring rice soil bacteria to reduce M. oryzae infections could provide a sustainable solution to reduce the amount of crops lost to blast disease. Results Naturally occurring root-associated rhizospheric bacteria were isolated from California field grown rice plants (M-104), eleven of which were taxonomically identified by16S rRNA gene sequencing and fatty acid methyl ester (FAME) analysis. Bacterial isolates were tested for biocontrol activity against the devastating foliar rice fungal pathogen, M. oryzae pathovar 70–15. In vitro, a Pseudomonas isolate, EA105, displayed antibiosis through reducing appressoria formation by nearly 90% as well as directly inhibiting fungal growth by 76%. Although hydrogen cyanide (HCN) is a volatile commonly produced by biocontrol pseudomonads, the activity of EA105 seems to be independent of its HCN production. During in planta experiments, EA105 reduced the number of blast lesions formed by 33% and Pantoea agglomerans isolate, EA106 by 46%. Our data also show both EA105 and EA106 trigger jasmonic acid (JA) and ethylene (ET) dependent induced systemic resistance (ISR) response in rice. Conclusions Out of 11 bacteria isolated from rice soil, pseudomonad EA105 most effectively inhibited the growth and appressoria formation of M. oryzae through a mechanism that is independent of cyanide production. In addition to direct antagonism, EA105 also appears to trigger ISR in rice plants through a mechanism that is dependent on JA and ET signaling, ultimately resulting in fewer blast lesions. The application of native bacteria as biocontrol agents in combination with current disease protection strategies could aid in global food security.

2014-01-01

281

Note: A table-top blast driven shock tube.  

PubMed

The prevalence of blast-induced traumatic brain injury in conflicts in Iraq and Afghanistan has motivated laboratory scale experiments on biomedical effects of blast waves and studies of blast wave transmission properties of various materials in hopes of improving armor design to mitigate these injuries. This paper describes the design and performance of a table-top shock tube that is more convenient and widely accessible than traditional compression driven and blast driven shock tubes. The design is simple: it is an explosive driven shock tube employing a rifle primer that explodes when impacted by the firing pin. The firearm barrel acts as the shock tube, and the shock wave emerges from the muzzle. The small size of this shock tube can facilitate localized application of a blast wave to a subject, tissue, or material under test. PMID:21198058

Courtney, Michael W; Courtney, Amy C

2010-12-01

282

Note: A table-top blast driven shock tube  

NASA Astrophysics Data System (ADS)

The prevalence of blast-induced traumatic brain injury in conflicts in Iraq and Afghanistan has motivated laboratory scale experiments on biomedical effects of blast waves and studies of blast wave transmission properties of various materials in hopes of improving armor design to mitigate these injuries. This paper describes the design and performance of a table-top shock tube that is more convenient and widely accessible than traditional compression driven and blast driven shock tubes. The design is simple: it is an explosive driven shock tube employing a rifle primer that explodes when impacted by the firing pin. The firearm barrel acts as the shock tube, and the shock wave emerges from the muzzle. The small size of this shock tube can facilitate localized application of a blast wave to a subject, tissue, or material under test.

Courtney, Michael W.; Courtney, Amy C.

2010-12-01

283

Results of W-87/Mk21 Deployment Separation Shock Tests  

NASA Astrophysics Data System (ADS)

This report summarizes results of the W-87/Mk21 Deployment Separation Shock Tests conducted at the Survivability and Vulnerability Integration Center (SVIC) Hill Air Force Base in Ogden, Utah, from 10/5/98 to 10/8/98. Specific details regarding the test plan and procedures can be found in the Master Test Plan listed in the references.

Avalle, C. A.

1999-04-01

284

Space Power Demonstration Engine linear alternator dynamometer test results  

Microsoft Academic Search

To verify the alternator bench test and finite element code results, it was decided to test the Space Power Demonstration Engine (SPDE) alternator on a linear dynamometer. The dynamometer tests confirmed that the primary source of losses in the SPDE alternator assembly was the adjacent magnetic structure and not the alternator proper. Alternator efficiency above 90% was demonstrated by substitution

M. Dhar; J. Rauch; S. Huang; R. Bolton

1989-01-01

285

Flight Test Results for a Turbulence Detection Radar  

NASA Technical Reports Server (NTRS)

This viewgraph presentation provides an overview of flight tests conducted on an aircraft turbulence detection radar system. Topics covered include: flight operations summary, radar data collection, baseline algorithm methodology, radar hazard tables and proposed alert criteria. Flight tests results are presented and summarized. Data analysis from these flight tests are also included.

Schaffner, Phil

2003-01-01

286

Preliminary test results of prototype urban maglev train  

Microsoft Academic Search

The Urban Maglev Program is a unique type of R&D project in the sense that it is a combination of R&D project and construction project. The prototype maglev vehicles of commercialization model were built and have been under various tests on the test track. The preliminary test results of the maglev vehicles show that the performances including powering and braking,

Byung Chun Shin

2010-01-01

287

A reliability test system for educational purposes-basic results  

Microsoft Academic Search

A set of basic reliability indices at the generation and composite generation and transmission levels for a small reliability test system are presented. The test system and the results presented have evolved from reliability research and teaching programs. The indices presented are for fundamental reliability applications which should be covered in a power system reliability teaching program. The RBTS test

R. Billinton; S. Kumar; N. Chowdhury; K. Chu; L. Goel; E. Khan; P. Kos; G. Nourbakhsh; J. Oteng-Adjei

1990-01-01

288

Removal of phosphate from aqueous solution with blast furnace slag  

Microsoft Academic Search

Blast furnace slag was used to remove phosphate from aqueous solutions. The influence of pH, temperature, agitation rate, and blast furnace slag dosage on phosphate removal was investigated by conducting a series of batch adsorption experiments. In addition, the yield and mechanisms of phosphate removal were explained on the basis of the results of X-ray spectroscopy, measurements of zeta potential

Ensar Oguz

2004-01-01

289

Relationship Between Resistance Gene Analogue and Blast Resistance in Rice  

Microsoft Academic Search

DNA fragments of 43 rice varieties were amplified with 11 pairs of primers designed based on resistance gene analogue (RGA) of plants, and the blast resistance of the varieties was identified by inoculation with 33 isolates of Magnaporthe grisea collected from Yunnan Province, China. Clustering results revealed a significant correlation between the blast resistance and DNA bands with a correlation

Yu-min Chen; Cheng-ming Fan; Yan Yang; Yue-qiu He

2009-01-01

290

3D Tomographic imaging of colliding cylindrical blast waves  

Microsoft Academic Search

The interaction of strong shocks & radiative blast waves is believed to give rise to the turbulent, knotted structures commonly observed in extended astrophysical objects. Modeling these systems is however extremely challenging due to the complex interplay between hydrodynamics, radiation and atomic physics. As a result we have been developing laboratory scale blast wave collision experiments to provide high quality

R. A. Smith; J. Lazarus; M. Hohenberger; J. Robinson; A. Marocchino; J. Chittenden; M. Dunne; A. Moore; E. Gumbrell

2007-01-01

291

The spectrum of pediatric injuries after a bomb blast  

Microsoft Academic Search

The spectrum of pediatric injuries seen after a bomb blast is poorly documented. The pathophysiology of blast injuries differ significantly from other forms of trauma and typically result in large numbers of distinctly patterned injuries. On April 19, 1995, a truck bomb was detonated directly adjacent to the Alfred P. Murrah Federal Building in Oklahoma City, Oklahoma. A total of

Doris A Quintana; Fred B Jordan; David W Tuggle; P. Cameron Mantor; William P Tunell

1997-01-01

292

EDD-7 Electric Charge Point Meter test results  

SciTech Connect

The results of tests evaluating the electric switching portion of the EDD-7 Electric Charge Point Meter (ECPM) are presented. The ECPM is a modified parking meter that allows the purchase of 120 or 240 volt electric power. The ECPM is designed to make electricity available at any vehicle parking location. The test results indicate that the ECPM operated without failure thru a series of over current and ground fault tests at three different test temperatures. The magnitude of current required to trip the over current protection circuitry varied with temperature while the performance of the ground fault interruption circuitry did not change significantly with the test temperature.

Mersman, C.R.

1993-09-01

293

2007 Toyota Camry-7129 Hybrid Electric Vehicle Battery Test Results  

SciTech Connect

The U.S. Department of Energy's Advanced Vehicle Testing Activity conducts several different types of tests on hybrid electric vehicles, including testing hybrid electric vehicles batteries when both the vehicles and batteries are new, and at the conclusion of 160,000 miles of accelerated testing. This report documents the battery testing performed and battery testing results for the 2007 Toyota Camry hybrid electric vehicle (Vin Number JTNBB46K773007129). Testing was performed by the Electric Transportation Engineering Corporation. The Advanced Vehicle Testing Activity is part of the U.S. Department of Energy's Vehicle Technologies Program. The Idaho National Laboratory and the Electric Transportation Engineering Corporation conduct Advanced Vehicle Testing Activity for the U.S. Department of Energy.

Tyler Gray; Chester Motloch; James Francfort

2010-01-01

294

2007 Nissan Altima-7982 Hybrid Electric Vehicle Battery Test Results  

SciTech Connect

The U.S. Department of Energy's Advanced Vehicle Testing Activity conducts several different types of tests on hybrid electric vehicles, including testing hybrid electric vehicles batteries when both the vehicles and batteries are new, and at the conclusion of 160,000 miles of accelerated testing. This report documents the battery testing performed and battery testing results for the 2007 Nissan Altima hybrid electric vehicle (Vin Number 1N4CL21E27C177982). Testing was performed by the Electric Transportation Engineering Corporation. The Advanced Vehicle Testing Activity is part of the U.S. Department of Energy's Vehicle Technologies Program. The Idaho National Laboratory and the Electric Transportation Engineering Corporation conduct Advanced Vehicle Testing Activity for the U.S. Department of Energy.

Tyler Grey; Chester Motloch; James Francfort

2010-01-01

295

2006 Toyota Highlander-5681 Hybrid Electric Vehicle Battery Test Results  

SciTech Connect

The U.S. Department of Energy's Advanced Vehicle Testing Activity conducts several different types of tests on hybrid electric vehicles, including testing hybrid electric vehicles batteries when both the vehicles and batteries are new, and at the conclusion of 160,000 miles of accelerated testing. This report documents the battery testing performed and battery testing results for the 2007 Toyota Highlander hybrid electric vehicle (Vin Number JTEDW21A860005681). Testing was performed by the Electric Transportation Engineering Corporation. The Advanced Vehicle Testing Activity is part of the U.S. Department of Energy's Vehicle Technologies Program. The Idaho National Laboratory and the Electric Transportation Engineering Corporation conduct Advanced Vehicle Testing Activity for the U.S. Department of Energy.

Tyler Gray; Chester Motloch; James Francfort

2010-01-01

296

2006 Toyota Highlander-6395 Hyrid Electric Vehicle Battery Test Results  

SciTech Connect

The U.S. Department of Energy's Advanced Vehicle Testing Activity conducts several different types of tests on hybrid electric vehicles, including testing hybrid electric vehicles batteries when both the vehicles and batteries are new, and at the conclusion of 160,000 miles of accelerated testing. This report documents the battery testing performed and battery testing results for the 2007 Toyota Highlander hybrid electric vehicle (Vin Number JTEDW21A160006395). Testing was performed by the Electric Transportation Engineering Corporation. The Advanced Vehicle Testing Activity is part of the U.S. Department of Energy's Vehicle Technologies Program. The Idaho National Laboratory and the Electric Transportation Engineering Corporation conduct Advanced Vehicle Testing Activity for the U.S. Department of Energy.

Tyler Gray; Chester Motloch; James Francfort

2010-01-01

297

Single Pass Streaming BLAST on FPGAs*†  

PubMed Central

Approximate string matching is fundamental to bioinformatics and has been the subject of numerous FPGA acceleration studies. We address issues with respect to FPGA implementations of both BLAST- and dynamic-programming- (DP) based methods. Our primary contribution is a new algorithm for emulating the seeding and extension phases of BLAST. This operates in a single pass through a database at streaming rate, and with no preprocessing other than loading the query string. Moreover, it emulates parameters turned to maximum possible sensitivity with no slowdown. While current DP-based methods also operate at streaming rate, generating results can be cumbersome. We address this with a new structure for data extraction. We present results from several implementations showing order of magnitude acceleration over serial reference code. A simple extension assures compatibility with NCBI BLAST.

Herbordt, Martin C.; Model, Josh; Sukhwani, Bharat; Gu, Yongfeng; VanCourt, Tom

2008-01-01

298

Azimuthal variation of radiation of seismic energy from cast blasts  

SciTech Connect

As part of a series of seismic experiments designed to improve the understanding of the impact of mining blasts on verifying a Comprehensive Test Ban Treaty, a sixteen station network of three-component seismic sensors were deployed around a large cast shot in the Black Thunder Mine. The seismic stations were placed, where possible, at a range of 2.5 kilometers with a constant inter-station spacing of 22.5 degrees. All of the data were recorded with the seismometers oriented such that the radial component pointed to the middle point of the approximately 2 kilometer long shot. High quality data were recorded at each station. Data were scaled to a range of 2.5 kilometers and the sum of the absolute value of the vertical, radial, and transverse channels computed. These observations were used to construct radiation patterns of the seismic energy propagating from the cast shot. It is obvious that cast shots do not radiate seismic energy isotropically. Most of the vertical motion occurs behind the highwall while radial and transverse components of motion are enhanced in directions parallel to the highwall. These findings have implications for local (0.1 to 15 kilometer range) and possibly for regional (100 to 2,000 kilometer range) seismic observations of cast blasting. Locally, it could be argued that peak particle velocities could be scaled not only by range but also by azimuthal direction from the shot. This result implies that long term planning of pit orientation relative to sensitive structures could mitigate problems with vibration levels from future blasting operations. Regionally, the local radiation pattern may be important in determining the magnitude of large scale cast blasts. Improving the transparency of mining operations to international seismic monitoring systems may be possible with similar considerations.

Pearson, D.C.; Stump, B.W. [Los Alamos National Lab., NM (United States); Martin, R.L. [Thunder Basin Coal Co., Wright, WY (United States)

1996-12-31

299

BLAST: at the core of a powerful and diverse set of sequence analysis tools  

Microsoft Academic Search

Basic Local Alignment Search Tool (BLAST) is one of the most heavily used sequence analysis tools avail- able in the public domain. There is now a wide choice of BLAST algorithmsthatcanbeusedtosearch many different sequence databases via the BLAST web pages (http:\\/\\/www.ncbi.nlm.nih.gov\\/BLAST\\/). All the algorithm-database combinations can be executed with default parameters or with customized settings, and the results can be

Scott Mcginnis; Thomas L. Madden

2004-01-01

300

Correlating Flammability of Materials with FTIR Analysis Test Results  

NASA Technical Reports Server (NTRS)

The purpose of this experiment was to correlate flammability data with FTIR test results. Kydex 100 is a blend of chlorinated polyvinyl chloride and polymethylmethacrylate, with some filler materials. Samples supplied were 0.125 in. thick. 10 samples were taken from a sheet of Kydex and analyzed for flammability and by FTIR spectroscopy. This material was utilized as a round robin sample for flammability testing. The flammability test results were found to vary across the same sheet.

Moore, Robin; Whitfield, Steve

2003-01-01

301

Celiac Disease: Are Endomysial Antibody Test Results Being Used Appropriately?  

Microsoft Academic Search

Background: The aim of this study was to retrospec- tively examine how positive IgA-endomysial antibody (EMA) test results for celiac disease were being inter- preted and acted on by physicians in the Calgary Health Region. Methods: We reviewed consecutive EMA test results, with or without a serum IgA, obtained during a 17- month period. Seropositive tests were cross-referenced to the

Kelly E. McGowan; Martha E. Lyon; Steven D. Loken; J. Decker Butzner

2007-01-01

302

SEE and TID test results of 1 Gb flash memories  

Microsoft Academic Search

Single-event effects and total ionizing dose test results of 1 Gb flash memories are reported in this paper. Effects characterized include single-event upset, latchup and functional interrupt. New effects are discussed and compared with previous results.

Tilan E. Langley; Paul Murray

2004-01-01

303

A survey of relay test practices: 1991 Results  

Microsoft Academic Search

The results of a survey of North American Relay Engineers concerning their practices for testing protective and other relays and their personnel requirements are presented. In 1971, the IEEE Power System Relaying Committee reported the results of A Survey of Relay Test Practices'' which reflected the responses of 125 electric utilities with a total of 1,157 generating stations, 5,096 transmission

J. L. McElray; B. K. Warwick; E. A. Baumgartner

1994-01-01

304

The Dornier 328 Acoustic Test Cell (ATC) for interior noise tests and selected test results  

NASA Technical Reports Server (NTRS)

To perform acoustic studies for achieving low noise levels for the Dornier 328, an acoustic test cell (ATC) of the Dornier 328 has been built. The ATC consists of a fuselage section, a realistic fuselage suspension system, and three exterior noise simulation rings. A complex digital 60 channel computer/amplifier noise generation system as well as multichannel digital data acquisition and evaluation system have been used. The noise control tests started with vibration measurements for supporting acoustic data interpretation. In addition, experiments have been carried out on dynamic vibration absorbers, the most important passive noise reduction measure for low frequency propeller noise. The design and arrangement of the current ATC are presented. Furthermore, exterior noise simulation as well as data acquisition are explained. The most promising results show noise reduction due to synchrophasing and dynamic vibration absorbers.

Hackstein, H. Josef; Borchers, Ingo U.; Renger, Klaus; Vogt, Konrad

1992-01-01

305

Gemini B Blast Shield: Mechanical Properties of Aluminum Flexcore.  

National Technical Information Service (NTIS)

The Gemini B blast shield is a sandwich construction composed of glass fabric reinforced plastic skins adhesively bonded to aluminum Flexcore. The object of this test was to determine the plate shear strength and the flatwise bare compressive strength of ...

1968-01-01

306

30 CFR 57.22607 - Blasting on shift (III mines).  

Code of Federal Regulations, 2013 CFR

...NONMETAL MINES Safety Standards for Methane in Metal and Nonmetal Mines Explosives... When blasting on shift, tests for methane shall be made in the mine atmosphere...not be done when 1.0 percent or more methane is...

2013-07-01

307

A numerical study of bench blast row delay timing and its influence on percent cast  

Microsoft Academic Search

Sandia National Laboratories and ICI Explosives USA have worked together since 1987 to develop computer modeling techniques for Rock Blasting. A result of this effort is the computer program DMC (Distinct Motion Code) which was developed for two-dimensional simulation of rock motion following a blast (Taylor and Preece, 1989 & 1992). This program has been used to study blasting-induced rock

Preece

1992-01-01

308

A numerical study of bench blast row delay timing and its influence on percent cast  

Microsoft Academic Search

Sandia National Laboratories and ICI Explosives USA have worked together since 1987 to develop computer modeling techniques for Rock Blasting. A result of this effort is the computer program DMC (Distinct Motion Code) which was developed for two-dimensional simulation of rock motion following a blast (Taylor and Preece, 1989 1992). This program has been used to study blasting-induced rock motion

Preece

1992-01-01

309

Results of Detailed Hydrologic Characterization Tests - Fiscal Year 1999  

SciTech Connect

This report provides the results of detailed hydrologic characterization tests conducted within newly constructed Hanford Site wells during FY 1999. Detailed characterization tests performed during FY 1999 included: groundwater flow characterization, barometric response evaluation, slug tests, single-well tracer tests, constant-rate pumping tests, and in-well vertical flow tests. Hydraulic property estimates obtained from the detailed hydrologic tests include: transmissivity, hydraulic conductivity, specific yield, effective porosity, in-well lateral flow velocity, aquifer flow velocity, vertical distribution of hydraulic conductivity (within the well-screen section) and in-well vertical flow velocity. In addition, local groundwater flow characteristics (i.e., hydraulic gradient and flow direction) were determined for four sites where detailed well testing was performed.

Spane, Frank A.; Thorne, Paul D.; Newcomer, Darrell R.

2001-01-19

310

Planar blast scaling with condensed-phase explosives in a shock tube  

SciTech Connect

Blast waves are strong shock waves that result from large power density deposition into a fluid. The rapid energy release of high-explosive (HE) detonation provides sufficiently high power density for blast wave generation. Often it is desirable to quantify the energy released by such an event and to determine that energy relative to other reference explosives to derive an explosive-equivalence value. In this study, we use condensed-phase explosives to drive a blast wave in a shock tube. The explosive material and quantity were varied to produce blast waves of differing strengths. Pressure transducers at varying lengths measured the post-shock pressure, shock-wave arrival time and sidewall impulse associated with each test. Blast-scaling concepts in a one-dimensional geometry were then used to both determine the energy release associated with each test and to verify the scaling of the shock position versus time, overpressure versus distance, and impulse. Most blast scaling measurements to-date have been performed in a three-dimensional geometry such as a blast arena. Testing in a three-dimensional geometry can be challenging, however, as spherical shock-wave symmetry is required for good measurements. Additionally, the spherical wave strength decays rapidly with distance and it can be necessary to utilize larger (several kg) quantities of explosive to prevent significant decay from occurring before an idealized blast wave has formed. Such a mode of testing can be expensive, require large quantities of explosive, and be limited by both atmospheric conditions (such as rain) and by noise complaints from the population density near the test arena. Testing is possible in more compact geometries, however. Non-planar blast waves can be formed into a quasi-planar shape by confining the shock diffraction with the walls of a shock tube. Regardless of the initial form, the wave shape will begin to approximate a planar front after successive wave reflections from the tube walls. Such a technique has previously been used to obtain blast scaling measurements in the planar geometry with gaseous explosives and the condensed-phase explosive nitroguanidine. Recently, there has been much interest in the blast characterization of various non-ideal high explosive (NIHE) materials. With non-ideals, the detonation reaction zone is significantly larger (up to several cm for ANFO) than more ideal explosives. Wave curvature, induced by charge-geometry, can significantly affect the energy release associated with NIHEs. To measure maximum NIHE energy release accurately, it is desirable to minimize any such curvature and, if possible, to overdrive the detonation shock to ensure completion of chemical reactions ahead of the sonic locus associated with the reaction zone. This is achieved in the current study through use of a powerful booster HE and a charge geometry consisting of short cylindrical lengths of NIHE initiated along the charge centerline.

Jackson, Scott L [Los Alamos National Laboratory

2011-01-25

311

Expanded rock blast modeling capabilities of DMC{_}BLAST, including buffer blasting  

SciTech Connect

A discrete element computer program named DMC{_}BLAST (Distinct Motion Code) has been under development since 1987 for modeling rock blasting. This program employs explicit time integration and uses spherical or cylindrical elements that are represented as circles in 2-D. DMC{_}BLAST calculations compare favorably with data from actual bench blasts. The blast modeling capabilities of DMC{_}BLAST have been expanded to include independently dipping geologic layers, top surface, bottom surface and pit floor. The pit can also now be defined using coordinates based on the toe of the bench. A method for modeling decked explosives has been developed which allows accurate treatment of the inert materials (stemming) in the explosive column and approximate treatment of different explosives in the same blasthole. A DMC{_}BLAST user can specify decking through a specific geologic layer with either inert material or a different explosive. Another new feature of DMC{_}BLAST is specification of an uplift angle which is the angle between the normal to the blasthole and a vector defining the direction of explosive loading on particles adjacent to the blasthole. A buffer (choke) blast capability has been added for situations where previously blasted material is adjacent to the free face of the bench preventing any significant lateral motion during the blast.

Preece, D.S. [Sandia National Labs., Albuquerque, NM (United States); Tidman, J.P.; Chung, S.H. [ICI Explosives (Canada)

1996-12-31

312

New stray light test facility and initial results  

NASA Astrophysics Data System (ADS)

BATC has developed a new stray light test facility (SLTF) and performed initial tests demonstrating its capabilities. The facility interior is nearly all black and is a Class 5 cleanroom. Coupled with a double cylindrical chamber that reflects the specular light away from the instrument under test, the stray light control in the facility is excellent. The facility was designed to be able to test a wide variety of instruments at a range of source angles from in-field to large off-axis angles. Test results have demonstrated PST performance below 1E-9.

Fleming, John; Grochocki, Frank; Finch, Tim; Willis, Stew; Kaptchen, Paul

2008-08-01

313

Dynamic fragmentation of blast mitigants  

NASA Astrophysics Data System (ADS)

Experimental evidence from a wide range of sources shows that the expanding cloud of explosively disseminated material comprises “particles” or fragments which have different dimensions from those associated with the original material. Powders and liquids have often been used to surround explosives to act as blast mitigants, and this is the main driver for our research. There are also many other areas of interest where an initially intact material surrounding an explosive charge is dynamically fragmented into a distribution of fragment sizes. Examples of such areas include fuel air explosives and enhanced blast explosives as well as quasi-static pressure mitigation systems, and our studies are thus also relevant to these applications. In this paper, we consider the processes occurring as an explosive interacts with a surrounding layer of liquid or powder and identify why it is important to model these processes as a multiphase material problem as opposed to a single phase, single material velocity problem. We shall present results from this class of numerical modelling. In this paper we shall explore what determines the particle or fragment size distribution resulting from explosive dissemination of a layer of material and discuss reasons why clouds from disseminated liquids and powders look similar. We shall support our analysis with results from recent explosives trials and introduce early results from some ongoing small scale explosive mitigation experiments.

Milne, A. M.; Parrish, C.; Worland, I.

2010-02-01

314

NASA Fastrac Engine Gas Generator Component Test Program and Results  

NASA Technical Reports Server (NTRS)

This presentation consists of viewgraph which review the test program and the results of the tests for the Gas Generator (GG) component for the Fastrac Engine. Included are pictures of the Fastrac (MC-1) Engine and the GG, diagrams of the flight configuration, and schematics of the LOX, and the RP-1 systems and the injector assembly. The normal operating parameters are reviewed, as are the test instrumentation. Also shown are graphs of the hot gas temperature, and the test temperature profiles. The results are summarized.

Dennis, Henry J., Jr.; Sanders, Tim; Turner, James E. (Technical Monitor)

2000-01-01

315

Performance test results for the Eaton dc developmental power train in an electric test bed vehicle  

Microsoft Academic Search

This report presents the results of the tests performed on a direct current (dc) power train in a test bed vehicle developed by the Eaton Corporation for the US Department of Energy (DOE). The tests were performed by EG and G Idaho, Inc. at the Idaho National Engineering Laboratory (INEL). The purpose of the INEL testing was to provide test

R. L. Crumley; M. R. Donaldson

1987-01-01

316

Performance test results for the Eaton dc development power train in an electric test bed vehicle  

Microsoft Academic Search

This report presents the results of the tests performed on a direct current (dc) power train in a test bed vehicle developed by the Eaton Corporation for the U.S. Department of Energy (DOE). The tests were performed by EG and G Idaho, Inc. at the Idaho National Engineering Laboratory (INEL). The purpose of the INEL testing was to provide test

R. L. Crumley; M. R. Donaldson

1987-01-01

317

Refurbishment of SRB aluminum components by walnut hull blast removal of protective coatings  

NASA Technical Reports Server (NTRS)

A test program was conducted to develop, optimize, and scale up an abrasive blasting procedure was developed for refurbishment of specific SRB components: aft skirt, forward skirt, frustrum, and painted piece parts. Test specimens utilizing 2219 T87 aluminum substrate of varying thicknesses were prepared and blasted at progressively increasing pressures with selected abrasives. Specimens were analyzed for material response. The optimum blasting parameters were determined on panel specimens and verified on a large cylindrical integrated test bed.

Colberg, W. R.; Gordon, G. H.; Jackson, C. H.

1982-01-01

318

Mechanical properties testing and results for thermal barrier coatings  

NASA Technical Reports Server (NTRS)

The paper reports on several years of mechanical testing of thermal barrier coatings. The test results were generated to support the development of durability models for the coatings in heat engine applications. The test data that are reviewed include modulus, static strength, and fatigue strength data. The test methods and results are discussed, along with the significant difficulties inherent in mechanical testing of thermal barrier coating materials. The materials include 7 percent wt. and 8 percent wt. yttria, partially stabilized zirconia as well as a cermet material. Both low pressure plasma spray and electron-beam physical vapor deposited coatings were tested. The data indicate the basic trends in the mechanical properties of the coatings over a wide range of isothermal conditions. Some of the trends are correlated with material density.

Cruse, Thomas A.; Johnsen, B. P.; Nagy, Andrew

1995-01-01

319

Preliminary Results from the QuietSpike Flight Test  

NASA Technical Reports Server (NTRS)

This viewgraph presentation reviews the QuietSpike flight test results. It shows the previous tests from Nearfield probes. The presentation then reviews the approach to test the QuietSpike, and shows graphics of the positions of the test vehicles. It also shows the components of the Sonic Boom Probing Noseboom. A graph of the Pressure Over- Under-shoot (Shaped Sonic Boom Demonstration (SSBD)Data) is presented. It reviews the Shock Probing Orientations, explaining that the probing plane is always behind the tail of the QuietSpike jet. Graphs of the Shock Position Geometry (SSBD Data) and the QuietSpike signature as of the test on 12/13/06, Near-Field Probing Directly Under the QuietSpike jet, and Near-Field Probing to Side, Near-Field Probing Above and to Side. Several slides review the Computational Fluid Dynamic models, and results compared to the probe tests.

Haering, Edward A., Jr.; Cliatt, Larry J., II; Howe, Don; Waithe, Kenrick

2007-01-01

320

2007 Toyota Camry-6330 Hybrid Electric Vehicle Battery Test Results  

SciTech Connect

The U.S. Department of Energy's Advanced Vehicle Testing Activity (AVTA) conducts several different types of tests on hybrid electric vehicles (HEVs), including testing hybrid electric vehicles batteries when both the vehicles and batteries are new, and at the conclusion of 160,000 miles of accelerated testing. This report documents the battery testing performed and battery testing results for the 2007 Toyota Camry hybrid electric vehicle (Vin Number JTNBB46K673006330). Testing was performed by the Electric Transportation Engineering Corporation. The AVTA is part of the U.S. Department of Energy's Vehicle Technologies Program. The Idaho National Laboratory and the Electric Transportation Engineering Corporation conduct AVTA for the U.S. Department of Energy.

Tyler Gray; Chester Motloch; James Francfort

2010-01-01

321

2007 Nissan Altima-2351 Hybrid Electric Vehicle Battery Test Results  

SciTech Connect

The U.S. Department of Energy's (DOE) Advanced Vehicle Testing Activity (AVTA) conducts several different types of tests on hybrid electric vehicles (HEVs), including testing the HEV batteries when both the vehicles and batteries are new, and at the conclusion of 160,000 miles of on-road accelerated testing. This report documents the battery testing performed and the battery testing results for the 2007 Nissan Altima HEV, number 2351 (VIN 1N4CL21E87C172351). The battery testing was performed by the Electric Transportation Engineering Corporation (eTec). The Idaho National Laboratory and eTec conduct the AVTA for DOE’s Vehicle Technologies Program.

Tyler Gray; Chester Motloch; James Francfort

2010-01-01

322

Distinguishing Realistic Military Blasts from Firecrackers in Mitigation Studies of Blast Induced Traumatic Brain Injury  

SciTech Connect

In their Contributed Article, Nyein et al. (1,2) present numerical simulations of blast waves interacting with a helmeted head and conclude that a face shield may significantly mitigate blast induced traumatic brain injury (TBI). A face shield may indeed be important for future military helmets, but the authors derive their conclusions from a much smaller explosion than typically experienced on the battlefield. The blast from the 3.16 gm TNT charge of (1) has the following approximate peak overpressures, positive phase durations, and incident impulses (3): 10 atm, 0.25 ms, and 3.9 psi-ms at the front of the head (14 cm from charge), and 1.4 atm, 0.32 ms, and 1.7 psi-ms at the back of a typical 20 cm head (34 cm from charge). The peak pressure of the wave decreases by a factor of 7 as it traverses the head. The blast conditions are at the threshold for injury at the front of the head, but well below threshold at the back of the head (4). The blast traverses the head in 0.3 ms, roughly equal to the positive phase duration of the blast. Therefore, when the blast reaches the back of the head, near ambient conditions exist at the front. Because the headform is so close to the charge, it experiences a wave with significant curvature. By contrast, a realistic blast from a 2.2 kg TNT charge ({approx} an uncased 105 mm artillery round) is fatal at an overpressure of 10 atm (4). For an injury level (4) similar to (1), a 2.2 kg charge has the following approximate peak overpressures, positive phase durations, and incident impulses (3): 2.1 atm, 2.3 ms, and 18 psi-ms at the front of the head (250 cm from charge), and 1.8 atm, 2.5 ms, and 16.8 psi-ms at the back of the head (270 cm from charge). The peak pressure decreases by only a factor of 1.2 as it traverses the head. Because the 0.36 ms traversal time is much smaller than the positive phase duration, pressures on the head become relatively uniform when the blast reaches the back of the head. The larger standoff implies that the headform locally experiences a nearly planar blast wave. Also, the positive phase durations and blast impulses are much larger than those of (1). Consequently, the blast model used in (1) is spatially and temporally very different from a military blast. It would be useful to repeat the calculations using military blast parameters. Finally, (1) overlooks a significant part of (5). On page 1 and on page 3, (1) states that (5) did not consider helmet pads. But pages pages 3 and 4 of (5) present simulations of blast wave propagation across an ACH helmeted head form with and without pads. (5) states that when the pads are present, the 'underwash' of air under the helmet is blocked when compared to the case without. (1) reaches this same conclusion, but reports it as a new result rather than a confirmation of that already found in (5).

Moss, W C; King, M J; Blackman, E G

2011-01-21

323

High-G centrifuge test results: Fine coal dewatering  

Microsoft Academic Search

This paper presents the results of 18 high-G centrifuge tests performed at the Electric Power Research Institute's Coal Cleaning Test Facility in January 1985. These tests, using -28 mesh (0.6mm) froth flotation product, show that the high-G, solid-bowl centrifuge can produce clean-coal moistures of less than 12 percent at solids recovery rates exceeding 98 percent. The high-G centrifuge achieved these

C. D. Harrison; J. R. Cavalet

1985-01-01

324

Sims Prototype System 2 test results: Engineering analysis  

NASA Technical Reports Server (NTRS)

The testing, problems encountered, and the results and conclusions obtained from tests performed on the IBM Prototype System, 2, solar hot water system, at the Marshall Space Flight Center Solar Test Facility was described. System 2 is a liquid, non draining solar energy system for supplying domestic hot water to single residences. The system consists of collectors, storage tank, heat exchanger, pumps and associated plumbing and controls.

1978-01-01

325

HSST wide-plate test results and analysis  

Microsoft Academic Search

Fifteen wide-plate crack-arrest tests have been completed to date, ten utilizing specimens fabricated from A533B class 1 material (WP-1 and WP-CE series), and five fabricated from a low upper-shelf base material (WP-2 series). Each test utilized a single-edge notched specimen that was subjected to a linear thermal gradient along the plane of crack propagation. Test results exhibit an increase in

D. J. Naus; B. R. Bass; J. Keeney-Walker; R. J. Fields; R. deWit; S. R. Low

1988-01-01

326

Evaluation of LOINC for Representing Constitutional Cytogenetic Test Result Reports  

PubMed Central

Genetic testing is becoming increasingly important to medical practice. Integrating genetics and genomics data into electronic medical records is crucial in translating genetic discoveries into improved patient care. Information technology, especially Clinical Decision Support Systems, holds great potential to help clinical professionals take full advantage of genomic advances in their daily medical practice. However, issues relating to standard terminology and information models for exchanging genetic testing results remain relatively unexplored. This study evaluates whether the current LOINC standard is adequate to represent constitutional cytogenetic test result reports using sample result reports from ARUP Laboratories. The results demonstrate that current standard terminology is insufficient to support the needs of coding cytogenetic test results. The terminology infrastructure must be developed before clinical information systems will be able to handle the high volumes of genetic data expected in the near future.

Heras, Yan Z.; Mitchell, Joyce A.; Williams, Marc S.; Brothman, Arthur R.; Huff, Stanley M.

2009-01-01

327

Coupled rock motion and gas flow modeling in blasting  

SciTech Connect

The spherical element computer code DMC (Distinct Motion Code) used to model rock motion resulting from blasting has been enhanced to allow routine computer simulations of bench blasting. The enhancements required for bench blast simulation include: (1) modifying the gas flow portion of DMC, (2) adding a new explosive gas equation of state capability, (3) modifying the porosity calculation, and (4) accounting for blastwell spacing parallel to the face. A parametric study performed with DMC shows logical variation of the face velocity as burden, spacing, blastwell diameter and explosive type are varied. These additions represent a significant advance in the capability of DMC which will not only aid in understanding the physics involved in blasting but will also become a blast design tool. 8 refs., 7 figs., 1 tab.

Preece, D.S. (Sandia National Labs., Albuquerque, NM (United States)); Knudsen, S.D. (RE/SPEC, Inc., Albuquerque, NM (United States))

1991-01-01

328

Development and Results of a First Generation Least Expensive Approach to Fission: Module Tests and Results  

NASA Technical Reports Server (NTRS)

The use of resistance heaters to simulate heat from fission allows extensive development of fission systems to be performed in non-nuclear test facilities, saving time and money. Resistance heated tests on the Module Unfueled Thermal-hydraulic Test (MUTT) article has been performed at the Marshall Space Flight Center. This paper discusses the results of these experiments and identifies future tests to be performed.

Houts, Mike; Godfroy, Tom; Pederson, Kevin; Sena, J. Tom; VanDyke, Melissa; Dickens, Ricky; Reid, Bob J.; Martin, Jim

2000-01-01

329

The Reliability of Results from National Curriculum Testing in England  

ERIC Educational Resources Information Center

Background: National curriculum tests have been administered in England for well over a decade. Although reliability evidence has been published, critics have argued that there is not enough evidence (of the right kind) and that test results may be insufficiently reliable. Purpose: This article collates and discusses evidence on the reliability of…

Newton, Paul E.

2009-01-01

330

Test results for SEU and SEL immune memory circuits  

NASA Technical Reports Server (NTRS)

Test results for three SEU logic/circuit hardened CMOS memory circuits verify upset and latch-up immunity for two configurations to be in excess of 120 MeV cm(exp 2)/mg using a commercial, non-radiation hardened CMOS process. Test chips from three separate fabrication runs in two different process were evaluated.

Wiseman, D.; Canaris, J.; Whitaker, S.; Gambles, J.; Arave, K.; Arave, L.

1993-01-01

331

Interim results of DABS\\/ATCRBS electromagnetic compatibility testing  

Microsoft Academic Search

Tests were conducted and results were presented at the National Aviation Facilities Experimental Center (NAFEC) to determine what effect the implementation of the Discrete Address Beacon System (DABS) has on the performance of the Air Traffic Control Radar Beacon System (ATCRBS). Uplink tests were conducted to measure transponder suppression rates in the ACTRBS airborne environment under various DABS and ATCRBS

G. Mahnken; L. Wapelhorst

1979-01-01

332

NASA Fastrac Engine Gas Generator Component Test Program and Results.  

National Technical Information Service (NTIS)

This presentation consists of viewgraph which review the test program and the results of the tests for the Gas Generator (GG) component for the Fastrac Engine. Included are pictures of the Fastrac (MC-1) Engine and the GG, diagrams of the flight configura...

H. J. Dennis T. Sanders

2000-01-01

333

General Test Result Checking with Log File Analysis  

Microsoft Academic Search

We describe and apply a lightweight formal method for checking test results. The method assumes that the software under test writes a text log file; this log file is then analyzed by a program to see if it reveals failures. We suggest a state-machine-based formalism for specifying the log file analyzer programs and describe a language and implementation based on

James H. Andrews; Yingjun Zhang

2003-01-01

334

Results of no-flow rotary drill bit comparison testing.  

National Technical Information Service (NTIS)

This document describes the results of testing of a newer rotary sampling bit and sampler insert called the No-Flow System. This No-Flow System was tested by side against the currently used rotary bit and sampler insert, called the Standard System. The tw...

K. S. Witwer

1998-01-01

335

Swine influenza test results from animal health laboratories in Canada  

PubMed Central

Due to its infrastructure and partnerships the Canadian Animal Health Surveillance Network was able to rapidly collect test results from 9 Canadian laboratories that were conducting primary testing for influenza on swine-origin samples, in response to the threat posed by the pandemic H1N1 influenza virus in 2009.

Kloeze, Harold; Mukhi, Shamir N.; Alexandersen, Soren

2013-01-01

336

Performance of blasting caps  

NASA Technical Reports Server (NTRS)

Common blasting caps are made from an aluminum shell in the form of a tube which is closed at both ends. One end, which is called the output end, terminates in a principal side or face, and contains a detonating agent which communicates with a means for igniting the detonating agent. The improvement of the present invention is a flat, steel foil bonded to the face in a position which is aligned perpendicularly to the longitudinal axis of the tube.

Bement, Laurence J. (inventor); Schimmel, Morry L. (inventor); Perry, Ronnie B. (inventor)

1993-01-01

337

COMPARATIVE PULMONARY TOXICITY OF BLASTING SAND AND FIVE SUBSTITUTE ABRASIVE BLASTING AGENTS  

Microsoft Academic Search

Blasting sand is used for abrasive blasting, but its inhalation is associated with pulmonary inflammation and fibrosis. Consequently, safer substitute materials for blasting sand are needed. In a previous study from this laboratory, the comparative pulmonary toxicity of five abrasive blasting substitutes and blasting sand was reported. In this study, the pulmonary toxicity of blasting sand was compared to five

Dale W. Porter; Ann F. Hubbs; Victor A. Robinson; Lori A. Battelli; Mark Greskevitch; Mark Barger; Douglas Landsittel; William Jones; Vincent Castranova

2002-01-01

338

The effect of abrasive blasting on the strength of a joint between dental porcelain and metal base.  

PubMed

This paper presents the effect of selected parameters of abrasive blasting on the strength of a joint between dental porcelain and metal base. Experiments were conducted for different grain sizes of abrasive material and different blasting angles, with a constant blasting pressure. InLine dental porcelain was fused on samples of cobalt-chromium alloy following abrasive blasting; they were subsequently subjected to shearing forces on a testing machine. The fractures were observed under an electron scanning microscope in order to determine the character and course of fracturing. Strength tests showed that the grain size of abrasive material was a parameter with the greatest effect on the strength. The best effects were achieved for samples subjected to abrasive blasting with material with grain size of 110 ?m. No statistically significant differences were found for the strength of samples worked at different angles. The results of the fractographic examinations have shown that in all the samples, fracturing occurred mainly along the porcelain-metal boundary, with few cases of fracturing through porcelain. PMID:24708248

Pietnicki, Krzysztof; Wo?owiec, Emilia; Klimek, Leszek

2014-01-01

339

Apollo experience report: Electronic systems test program accomplishments and results  

NASA Technical Reports Server (NTRS)

A chronological record is presented of the Electronic Systems Test Program from its conception in May 1963 to December 1969. The original concept of the program, which was primarily a spacecraft/Manned Space Flight Network communications system compatibility and performance evaluation, is described. The evolution of these concepts to include various levels of test detail, as well as systems level design verification testing, is discussed. Actual implementation of these concepts is presented, and the facility to support the program is described. Test results are given, and significant contributions to the lunar landing mission are underlined. Plans for modifying the facility and the concepts, based on Apollo experience, are proposed.

Ohnesorge, T. E.

1972-01-01

340

Test results on reuse of reclaimed shower water - A summary  

NASA Technical Reports Server (NTRS)

Results are presented from tests to evaluate a microgravity whole body shower and waste water recovery system design for possible use on the Space Station. Several water recovery methods were tested, including phase change distillation, a thermoelectric hollow fiber membrane evaporation subsystem, and a reverse osmosis dynamic membrane system. Consideration is given to the test hardware, the types of soaps evaluated, the human response to showering with reclaimed water, chemical treatment for microbial control, the procedures for providing hygienic water, and the quality of water produced by the systems. All three of the waste water recovery systems tested successfully produced reclaimed water for reuse.

Verostko, Charles E.; Garcia, Rafael; Sauer, Richard; Reysa, Richard P.; Linton, Arthur T.

1989-01-01

341

Results of no-flow rotary drill bit comparison testing  

SciTech Connect

This document describes the results of testing of a newer rotary sampling bit and sampler insert called the No-Flow System. This No-Flow System was tested side by side against the currently used rotary bit and sampler insert, called the Standard System. The two systems were tested using several ''hard to sample'' granular non-hazardous simulants to determine which could provide greater sample recovery. The No-Flow System measurably outperformed the Standard System in each of the tested simulants.

WITWER, K.S.

1998-11-30

342

En route noise test preliminary results. [for advanced turboprop aircraft  

NASA Technical Reports Server (NTRS)

Preliminary results are reported from ground measurements of noise emitted by a full-scale advanced single-rotation turbofan model mounted on the wing of the NASA Lewis Propfan Test Assessment aircraft during test flights in October 1987. The procedures and instruments employed in the test program are described, and the data are presented in tables. The repeatability of the measurements is shown to be good within one test day, with day-to-day variations attributed to cross-wind convection. Fair agreement is found between these measurements and the predictions of ray-tracing models.

Willshire, William L., Jr.; Garber, Donald P.

1989-01-01

343

Triaxial and Torsional Shear Test Results for Sand.  

National Technical Information Service (NTIS)

This report presents the results of the laboratory tests conducted in triaxial and torsional apparatus. The purposes of this report are not only to support the calibration and verification of the bounding surface hypoplasticity model for granular soil but...

B. L. Kutter Y. R. Chen C. K. Shen

1994-01-01

344

Interim Results of DABS/ATCRBS Electromagnetic Compatibility Testing.  

National Technical Information Service (NTIS)

This report describes the tests being conducted to determine what effect the implementation of the Discrete Address Beacon System (DABS) will have on the performance of the Air Traffic Control Radar Beacon System (ATCRBS), and presents interim results on ...

G. Mahnken L. Wapelhorst

1979-01-01

345

Interpreting Results from the Standardized UXO Test Sites.  

National Technical Information Service (NTIS)

The Institute for Defense Analyses (IDA) was tasked by the Strategic Environmental Research and Development Program (SERDP) and the Environmental Security Technology Certification Program (ESCTP) to complete a detailed analysis of the results of testing c...

M. May M. Tuley

2007-01-01

346

TF34 Quiet Nacelle nearfield acoustic test results  

NASA Technical Reports Server (NTRS)

The results of the nearfield acoustic tests conducted on the TF34 Quiet Nacelle are presented. The high fan noise suppression levels being sought (26 PNdB reduction in aft noise) necessitated the use of an extensive system of special nearfield acoustic instrumentation to properly evaluate the suppression achieved. The design, operation, and test results from each of these nearfield acoustic instrumentation systems are presented.

Coward, W. E.; Smith, E. B.; Sowers, H. D.

1974-01-01

347

Delta undulator model: Magnetic field and beam test results  

SciTech Connect

A novel type of in-vacuum Elliptical Polarization Undulator (EPU) magnet optimized for linac beam (Delta undulator) was developed at the Laboratory for Elementary-Particle Physics (LEPP) at Cornell University as part of insertion device development for the future Cornell 5 GeV Energy Recovery Source of coherent hard X-rays [1,7]. To evaluate mechanical, vacuum and magnetic properties of the magnet, a short 30 cm model with a 5 mm diameter round gap and a 2.4 cm period was built and tested in LEPP. The beam test of the Delta undulator model was conducted at Accelerator Test Facility (ATF) in BNL with {approx}60 MeV linac beam. The beam testing results confirmed basic properties of the undulator magnet obtained through the magnetic field measurement. In the paper we describe the magnet design, techniques and setups used for the magnetic field measurement and the beam testing results.

Temnykh A.; Babzien M.; Davis, D.; Fedurin, M.; Kusche, K.; Park, J.; Yakimenko, V.

2010-11-10

348

DendroBLAST: approximate phylogenetic trees in the absence of multiple sequence alignments.  

PubMed

The rapidly growing availability of genome information has created considerable demand for both fast and accurate phylogenetic inference algorithms. We present a novel method called DendroBLAST for reconstructing phylogenetic dendrograms/trees from protein sequences using BLAST. This method differs from other methods by incorporating a simple model of sequence evolution to test the effect of introducing sequence changes on the reliability of the bipartitions in the inferred tree. Using realistic simulated sequence data we demonstrate that this method produces phylogenetic trees that are more accurate than other commonly-used distance based methods though not as accurate as maximum likelihood methods from good quality multiple sequence alignments. In addition to tests on simulated data, we use DendroBLAST to generate input trees for a supertree reconstruction of the phylogeny of the Archaea. This independent analysis produces an approximate phylogeny of the Archaea that has both high precision and recall when compared to previously published analysis of the same dataset using conventional methods. Taken together these results demonstrate that approximate phylogenetic trees can be produced in the absence of multiple sequence alignments, and we propose that these trees will provide a platform for improving and informing downstream bioinformatic analysis. A web implementation of the DendroBLAST method is freely available for use at http://www.dendroblast.com/. PMID:23554899

Kelly, Steven; Maini, Philip K

2013-01-01

349

Low Emissions RQL Flametube Combustor Component Test Results  

NASA Technical Reports Server (NTRS)

This report describes and summarizes elements of the High Speed Research (HSR) Low Emissions Rich burn/Quick mix/Lean burn (RQL) flame tube combustor test program. This test program was performed at NASA Glenn Research Center circa 1992. The overall objective of this test program was to demonstrate and evaluate the capability of the RQL combustor concept for High Speed Civil Transport (HSCT) applications with the goal of achieving NOx emission index levels of 5 g/kg-fuel at representative HSCT supersonic cruise conditions. The specific objectives of the tests reported herein were to investigate component performance of the RQL combustor concept for use in the evolution of ultra-low NOx combustor design tools. Test results indicated that the RQL combustor emissions and performance at simulated supersonic cruise conditions were predominantly sensitive to the quick mixer subcomponent performance and not sensitive to fuel injector performance. Test results also indicated the mixing section configuration employing a single row of circular holes was the lowest NOx mixer tested probably due to the initial fast mixing characteristics of this mixing section. However, other quick mix orifice configurations such as the slanted slot mixer produced substantially lower levels of carbon monoxide emissions most likely due to the enhanced circumferential dispersion of the air addition. Test results also suggested that an optimum momentum-flux ratio exists for a given quick mix configuration. This would cause undesirable jet under- or over-penetration for test conditions with momentum-flux ratios below or above the optimum value. Tests conducted to assess the effect of quick mix flow area indicated that reduction in the quick mix flow area produced lower NOx emissions at reduced residence time, but this had no effect on NOx emissions measured at similar residence time for the configurations tested.

Holdeman, James D.; Chang, Clarence T.

2001-01-01

350

Low-energy demonstration accelerator (LEDA) test results and plans  

SciTech Connect

The LEDA 75-keV injector and 6.7-MeV RFQ have been tested with pulsed and cw proton beam currents up to 100 mA. Several LINAC2000 papers give the results of those measurements. A follow-on experiment, to intentionally introduce and measure beam halo on the RFQ output beam, is reported in several papers at this conference (PAC2001). In this paper we summarize the LEDA RFQ commissioning results and the beam-halo measurements and we discuss future test plans for this high-current, high-average-power rf structures test bed.

Smith, H. V. (Horace V.); Schneider, J. D. (J. David); Sheffield, R. L. (Richard L.)

2001-01-01

351

Dioxin testing results confirm safety of bleached paperboard milk cartons  

SciTech Connect

The US paper industry is pleased that dioxin testing results announced on September 1 by the Food and Drug Administration confirm that milk packaged in bleached paperboard cartons is safe to drink. And American Paper Institute President Red Cavaney said, the FDA test results closely parallel our own independent studies, results of which will be finalized within the next few days. He also reported that paper industry efforts to reduce further the trace amounts of unwanted dioxin formed in the bleached paper manufacturing process have led to impressive results.

Not Available

1989-10-01

352

Programmable Grit-Blasting System  

NASA Technical Reports Server (NTRS)

In programmable grit-blasting system undergoing design, controller moves blasting head to precise positions to shape or remove welding defects from parts. Controller holds head in position for preset dwell time and moves head to new position along predetermined path. Position of articulated head established by pair of servomotors according to programmed signals from controller. Head similar to video borescope. Used to remove welding defects in blind holes. Suited for repetitive production operations in grit-blast box.

Burley, Richard K.

1988-01-01

353

HSST wide-plate test results and analysis  

SciTech Connect

Fifteen wide-plate crack-arrest tests have been completed to date, ten utilizing specimens fabricated from A533B class 1 material (WP-1 and WP-CE series), and five fabricated from a low upper-shelf base material (WP-2 series). Each test utilized a single-edge notched specimen that was subjected to a linear thermal gradient along the plane of crack propagation. Test results exhibit an increase in crack-arrest toughness with temperature, with the rate of increase becoming greater as the temperature increases. When the wide-plate test results are combined with other large-specimen results the data show a consistent trend in which the K/sub Ia/ data extends above the limit provided in ASME Section XI. 24 refs., 11 figs., 7 tabs.

Naus, D.J.; Bass, B.R.; Keeney-Walker, J.; Fields, R.J.; deWit, R.; Low, S.R. III

1988-01-01

354

Update on results of SPRE testing at NASA Lewis  

NASA Technical Reports Server (NTRS)

The Space Power Research Engine (SPRE), a free-piston Stirling engine with a linear alternator, is being tested at NASA Lewis Research Center as part of the Civilian Space Technology Initiative (CSTI) as a candidate for high capacity space power. Results are presented from recent SPRE tests designed to investigated the effects of variation in the displacer seal clearance and piston centering port area on engine performance and dynamics. The impact of these variations on PV power and efficiency are presented. Comparisons of the displacer seal clearance tests results with HFAST code predictions show good agreement for PV power, but show poor agreement for PV efficiency. Correlations are presented relating the piston midstroke position to the dynamic Delta P across the piston and the centering port area. Test results indicate that a modest improvement in PV power and efficiency may be realized with a reduction in piston centering port area.

Cairelli, James E.; Swec, Diane M.; Wong, Wayne A.; Doeberling, Thomas J.; Madi, Frank J.

1991-01-01

355

Performance test results for the EATON AC3 developmental powertrain in an electric test bed vehicle  

Microsoft Academic Search

The purpose of the INEL testing was to provide test results from which an evaluation of the performance capabilities of the Eaton ac powertrain could be made and compared with other electric vehicle propulsion systems. The major portion of the testing involved the use of a chassis dynamometer to simulate the road load losses of the test bed vehicle. Road

Heiselmann

1986-01-01

356

LIMESTONE WET-SCRUBBING TEST RESULTS AT THE EPA ALKALI SCRUBBING TEST FACILITY. CAPSULE REPORT  

EPA Science Inventory

This capsule report discusses the highlights of the first detailed engineering progress report. It describes the test facility and test program and presents results to date of the limestone wet-scrubbing testing. In addition, the realiability and operability of the test facility ...

357

Compound 49b protects against blast-induced retinal injury  

PubMed Central

Aim To determine whether Compound 49b, a novel beta-adrenergic receptor agonist, can prevent increased inflammation and apoptosis in mice after exposure to ocular blast. Methods Eyes of C57/BL6 mice were exposed to a blast of air from a paintball gun at 26 psi (?0.18 MPa). Eyes were collected 4 hours, 24 hours, and 72 hours after blast exposure. In a subset of mice, Compound 49b eyedrops (1 mM) were applied within 4 hours, 24 hours, or 72 hours of the blast. Three days after blast exposure, all mice were sacrificed. One eye was used to measure levels of retinal proteins (TNF?, IL-1?, Bax, BcL-xL, caspase 3, and cytochrome C). The other eye was used for TUNEL labeling of apoptotic cells, which were co-labeled with NeuN to stain for retinal ganglion cells. Results We found that ocular exposure to 26 psi air pressure led to a significant increase in levels of apoptotic and inflammatory mediators within 4 hours, which lasted throughout the period investigated. When Compound 49b was applied within 4 hours or 24 hours of blast injury, levels of apoptotic and inflammatory mediators were significantly reduced. Application of Compound 49b within 72 hours of blast injury reduced levels of inflammatory mediators, but not to untreated levels. Conclusions Ocular blast injury produces a significant increase in levels of key inflammatory and apoptotic markers in the retina as early as 4 hours after blast exposure. These levels are significantly reduced if a beta-adrenergic receptor agonist is applied within 24 hours of blast exposure. Data suggest that local application of beta-adrenergic receptor agonists may be beneficial to reduce inflammation and apoptosis.

2013-01-01

358

Mechanical properties testing and results for thermal barrier coatings  

NASA Technical Reports Server (NTRS)

Thermal Barrier Coatings (TBC's) provide a significant challenge in the evaluation of their mechanical properties in ways that provide data that is not specimen dependent. The paper reviews various developments of the principal author over the past several years for both plasma sprayed and physical vapor deposited (PVD) materials, as well as new data on the fatigue behavior of one material system. The test methods that have been employed address tensile and compressive modulus and ultimate strength, tensile and compressive fatigue strength, and interfacial strength. This testing is now underway. Property testing is especially difficult for TBC's owing to the limitation on fabrication thickness of the coating. Bending tests are not used as these tests do not provide sufficiently uniform states of strain for property evaluations. Test specimens with uniform states of axial stress have been devised for each material system. The results show that the material property results between various experimenters and experimental methods are not yet consistent. However, the results provide critical design data at a suitable level of accuracy for life prediction. The paper will review both tensile and compressive mechanical testing of uniaxial specimens showing property dependencies on material density and temperatures for both material systems. Successful test results for both tensile and compressive fatigue loadings will be given. The test data shows that the fatigue strength of the TBC's is highly stress dependent in both loading conditions and is likely to depend on stress range and not mean stress. The fatigue strength of the plasma sprayed TBC's appears to increase with elevated temperatures in a range of temperatures below the creep activation temperature for the materials. The plasma sprayed TBC materials have been confirmed to have cyclic hysteresis at all temperature levels down to room temperature. Limited failure analysis data for various specimens suggest that the failure modes are driven by normal geometric discontinuities in the TBC's.

Cruse, T. A.; Johnsen, B. P.

1995-01-01

359

Decontamination of DWPF canisters by glass frit blasting  

SciTech Connect

High-level radioactive waste at the Savannah River Plant will be incorporated in borosilicate glass for permanent disposal. The waste glass will be encapsulated in a 304L stainless steel canister. During the filling operation the outside of the canister will become contaminated. This contamination must be reduced to an accepable level before the canister leaves the Defense Waste Processing Facility (DWPF). Tests with contaminated coupons have demonstrated that this decontamination can be accomplished by blasting the surface with glass frit. The contaminated glass frit byproduct of this operation is used as a feedstock for the waste glass process, so no secondary waste is created. Three blasting techniques, using glass frit as the blasting medium, were evaluated. Air-injected slurry blasting was the most promising and was chosen for further development. The optimum parametric values for this process were determined in tests using coupon weight loss as the output parameter. 1 reference, 13 figures, 3 tables.

Ward, C R; Rankin, W N

1984-01-01

360

A Multi-Mode Shock Tube for Investigation of Blast-Induced Traumatic Brain Injury  

PubMed Central

Abstract Blast-induced mild traumatic brain injury (bTBI) has become increasingly common in recent military conflicts. The mechanisms by which non-impact blast exposure results in bTBI are incompletely understood. Current small animal bTBI models predominantly utilize compressed air-driven membrane rupture as their blast wave source, while large animal models use chemical explosives. The pressure-time signature of each blast mode is unique, making it difficult to evaluate the contributions of the different components of the blast wave to bTBI when using a single blast source. We utilized a multi-mode shock tube, the McMillan blast device, capable of utilizing compressed air- and compressed helium-driven membrane rupture, and the explosives oxyhydrogen and cyclotrimethylenetrinitramine (RDX, the primary component of C-4 plastic explosives) as the driving source. At similar maximal blast overpressures, the positive pressure phase of compressed air-driven blasts was longer, and the positive impulse was greater, than those observed for shockwaves produced by other driving sources. Helium-driven shockwaves more closely resembled RDX blasts, but by displacing air created a hypoxic environment within the shock tube. Pressure-time traces from oxyhydrogen-driven shockwaves were very similar those produced by RDX, although they resulted in elevated carbon monoxide levels due to combustion of the polyethylene bag used to contain the gases within the shock tube prior to detonation. Rats exposed to compressed air-driven blasts had more pronounced vascular damage than those exposed to oxyhydrogen-driven blasts of the same peak overpressure, indicating that differences in blast wave characteristics other than peak overpressure may influence the extent of bTBI. Use of this multi-mode shock tube in small animal models will enable comparison of the extent of brain injury with the pressure-time signature produced using each blast mode, facilitating evaluation of the blast wave components contributing to bTBI.

Reneer, Dexter V.; Hisel, Richard D.; Hoffman, Joshua M.; Kryscio, Richard J.; Lusk, Braden T.

2011-01-01

361

Detection of Blast-Related Traumatic Brain Injury in U.S. Military Personnel  

PubMed Central

BACKGROUND Blast-related traumatic brain injuries have been common in the Iraq and Afghanistan wars, but fundamental questions about the nature of these injuries remain unanswered. METHODS We tested the hypothesis that blast-related traumatic brain injury causes traumatic axonal injury, using diffusion tensor imaging (DTI), an advanced form of magnetic resonance imaging that is sensitive to axonal injury. The subjects were 63 U.S. military personnel who had a clinical diagnosis of mild, uncomplicated traumatic brain injury. They were evacuated from the field to the Landstuhl Regional Medical Center in Landstuhl, Germany, where they underwent DTI scanning within 90 days after the injury. All the subjects had primary blast exposure plus another, blast-related mechanism of injury (e.g., being struck by a blunt object or injured in a fall or motor vehicle crash). Controls consisted of 21 military personnel who had blast exposure and other injuries but no clinical diagnosis of traumatic brain injury. RESULTS Abnormalities revealed on DTI were consistent with traumatic axonal injury in many of the subjects with traumatic brain injury. None had detectible intracranial injury on computed tomography. As compared with DTI scans in controls, the scans in the subjects with traumatic brain injury showed marked abnormalities in the middle cerebellar peduncles (P<0.001), in cingulum bundles (P = 0.002), and in the right orbitofrontal white matter (P = 0.007). In 18 of the 63 subjects with traumatic brain injury, a significantly greater number of abnormalities were found on DTI than would be expected by chance (P<0.001). Follow-up DTI scans in 47 subjects with traumatic brain injury 6 to 12 months after enrollment showed persistent abnormalities that were consistent with evolving injuries. CONCLUSIONS DTI findings in U.S. military personnel support the hypothesis that blast-related mild traumatic brain injury can involve axonal injury. However, the contribution of primary blast exposure as compared with that of other types of injury could not be determined directly, since none of the subjects with traumatic brain injury had isolated primary blast injury. Furthermore, many of these subjects did not have abnormalities on DTI. Thus, traumatic brain injury remains a clinical diagnosis. (Funded by the Congressionally Directed Medical Research Program and the National Institutes of Health; ClinicalTrials.gov number, NCT00785304.)

Mac Donald, Christine L.; Johnson, Ann M.; Cooper, Dana; Nelson, Elliot C.; Werner, Nicole J.; Shimony, Joshua S.; Snyder, Abraham Z.; Raichle, Marcus E.; Witherow, John R.; Fang, Raymond; Flaherty, Stephen F.; Brody, David L.

2011-01-01

362

Designs and test results for three new rotational sensors  

USGS Publications Warehouse

We discuss the designs and testing of three rotational seismometer prototypes developed at the Institute of Geophysics, Academy of Sciences (Prague, Czech Republic). Two of these designs consist of a liquid-filled toroidal tube with the liquid as the proof mass and providing damping; we tested the piezoelectric and pressure transduction versions of this torus. The third design is a wheel-shaped solid metal inertial sensor with capacitive sensing and magnetic damping. Our results from testing in Prague and at the Albuquerque Seismological Laboratory of the US Geological Survey of transfer function and cross-axis sensitivities are good enough to justify the refinement and subsequent testing of advanced prototypes. These refinements and new testing are well along.

Jedlicka, P.; Kozak, J. T.; Evans, J. R.; Hutt, C. R.

2012-01-01

363

COMPARISON OF RESPONSE OF 9977 TEST PACKAGES TO ANALYTICAL RESULTS  

SciTech Connect

Each of the hypothetical accident test cases for the 9977 prototypes was included in the battery of finite element structural analyses performed for the package. Comparison of the experimental and analytical results provides a means of confirming that the analytical model correctly represents the physical behavior of the package. The ability of the analytical model to correctly predict the performance of the foam overpack material for the crush test is of particular interest. The dissipation of energy in the crushing process determines the deceleration of the package upon impact and the duration of the impact. In addition, if the analytical model correctly models the foam behavior, the predicted deformation of the package will match that measured on the test articles. This study compares the deformations of the test packages with the analytical predictions. In addition, the impact acceleration and impact duration for the test articles are compared with those predicted by the analyses.

Smith, A; Tsu-Te Wu, T

2007-12-05

364

NEXT Ion Engine 2000 Hour Wear Test Results  

NASA Technical Reports Server (NTRS)

The results of the NEXT 2000 h wear test are presented. This test was conducted with a 40 cm engineering model ion engine, designated EM1, at a 3.52 A beam current and 1800 V beam power supply voltage. Performance tests, which were conducted over a throttling range of 1.1 to 6.9 kW throughout the wear test, demonstrated that EM1 satisfied all thruster performance requirements. The ion engine accumulated 2038 h of operation at a thruster input power of 6.9 kW, processing 43 kg of xenon. Overall ion engine performance, which includes thrust, thruster input power, specific impulse, and thrust efficiency, was steady with no indications of performance degradation. The ion engine was also inspected following the test. This paper presents these findings.

Soulas, George C.; Kamhawi, Hani; Patterson, Michael J.; Britton, Melissa A.; Frandina, Michael M.

2004-01-01

365

Statistical analysis of Salmonella test data and comparison to results of animal cancer tests  

Microsoft Academic Search

Summary A quantitative framework for the analysis of results of the Salmonella (Ames) test is presented, and the relationship between mutagenesis and carcinogenesis is examined. Color graphics are used for the Salmonella data to describe variability, and trends across multiple chemicals and test conditions. Positivity in the Salmonella test, using statistical criteria to classify results, is compared to positivity in

Joyce McCann; L SWIRSKYGOLD; Laura Horn; R. McGill; T. E. Graedel; John Kaldor

1988-01-01

366

Automated Testing Infrastructure and Result Comparison for Geodynamics Codes  

NASA Astrophysics Data System (ADS)

The geodynamics community uses a wide variety of codes on a wide variety of both software and hardware platforms to simulate geophysical phenomenon. These codes are generally variants of finite difference or finite element calculations involving Stokes flow or wave propagation. A significant problem is that codes of even low complexity will return different results depending on the platform due to slight differences in hardware, software, compiler, and libraries. Furthermore, changes to the codes during development may affect solutions in unexpected ways such that previously validated results are altered. The Computational Infrastructure for Geodynamics (CIG) is funded by the NSF to enhance the capabilities of the geodynamics community through software development. CIG has recently done extensive work in setting up an automated testing and result validation system based on the BaTLab system developed at the University of Wisconsin, Madison. This system uses 16 variants of Linux and Mac platforms on both 32 and 64-bit processors to test several CIG codes, and has also recently been extended to support testing on the XSEDE TACC (Texas Advanced Computing Center) Stampede cluster. In this work we overview the system design and demonstrate how automated testing and validation occurs and results are reported. We also examine several results from the system from different codes and discuss how changes in compilers and libraries affect the results. Finally we detail some result comparison tools for different types of output (scalar fields, velocity fields, seismogram data), and discuss within what margins different results can be considered equivalent.

Heien, E. M.; Kellogg, L. H.

2013-12-01

367

Experiences with computer systems in blast furnace operation control at Rautaruukki  

SciTech Connect

Low energy consumption, together with high productivity and stable blast furnace operation, has been achieved at Rautaruukki's Raahe Steel Works as a result of the efficient use of computer technology in process control and improvements in raw materials quality. The blast furnace supervision system is designed to support the decision-making in medium and long-term process control. The information presenting the blast furnace operation phenomena is grouped so that little time is needed to obtain the current state of the process. Due to the complexity of the blast furnace process, an expert system to guide and diagnose the short and medium-term blast furnace operation has been developed.

Inkala, P.; Karppinen, A. (Rautaruukki Oy, Raahe (Finland). Raahe Steel Works); Seppanen, M. (Rautaruukki Oy Engineering, Oulu (Finland))

1994-09-01

368

Preliminary results of the partial array LCT coil tests  

SciTech Connect

The Large Coil Task (LCT) is a collaboration between the US, Euratom, Japan, and Switzerland for the production and testing of 2.5 x 3.5-m bore, superconducting 8-T magnets. The definitive tests in the design configuration, the six coils arrayed in a compact torus, will begin in 1985. Partial-array tests are being done in 1984. In January the initial cooldown of two coils was aborted because of helium-to-vacuum leaks that developed in certain seal welds when the coil temperatures were 170 to 180 K. In July three adjacent coils (designated JA, GD, CH) were cooled and in August two were energized to the limits of the test facility. An overview of the results are presented, including facility, cooldown (warmup has not yet begun), energization, dump, recovery from intentional normal zones, strain, and displacement, for operation up to 100% of design current but below full field and stress. These initial results are highly encouraging.

Luton, J.N.; Cogswell, F.D.; Dresner, L.; Friesinger, G.M.; Gray, W.H.; Iwasa, Y.; Koizumi, K.; Lubell, M.S.; Lue, J.W.; Nishi, M.F.

1984-09-10

369

1-pin blanket mockup: Results of the extended test campaign  

SciTech Connect

Following a preliminary test campaign (200 thermal cycles) on a solid breeder blanket mockup, an extended test campaign (about 1000 thermal cycles) has been carried out by ENEA. The duration of the test campaign represents a significant fraction of the blanket module lifetime in the ITER device. In particular, these out-of-pile experiments have been performed in order to test (both functional and endurance testing) the thermal-hydraulic and thermo-mechanical performance of a water cooled breeder-in-tube blanket mockup (1-PIN) using Li{sub 2}ZrO{sub 3} pebbles as a breeder material. The test campaign has been completed and the resulting data concerning thermal and thermal-hydraulic parameters have been elaborated and analyzed by means of a comparison with theoretical predictions based on a proper thermal-hydraulic model. The post test examination of the pebbles is in progress in order to investigate the thermo-mechanical behavior of the breeder material under cycling. The paper deals with the first part of the results. 6 refs., 11 figs., 1 tab.

Ferrari, M.; Talarico, C. [EURATOM-ENEA, Frascati (Italy); Furrer, M.; Simbolotti, G. [ENEA, S. Maria in Galeria (Italy)

1996-12-31

370

Testing GR with the Double Pulsar: Recent Results  

NASA Astrophysics Data System (ADS)

The recently discovered double pulsar system is the most wonderful system to study relativistic gravity in the strong field limit. The possibility to measure two clocks orbiting each other in a strong gravitational field allows tests of GR and other theories of gravity that have not been possible before. This talk will report on the achieved tests and will focus on the most recent results.

Kramer, Michael

371

Argon Spill Duct Bellows Leak Test Procedures and Results  

SciTech Connect

This engineering note describes the testing of the argoll spill duct bellows. It includes a detailed explanation of the procedures, along with a summary of the results of the testing done on 2/18/91 and 2/19/91 by Gary Trotter. The original bellows were purchased from Expansion Joint Systems (see Appendix 2). The general conclusion from the testing was that the leaks that were found were small enough so that they would not show up at the design pressure of 0.1 psig. Therefore, the leaks were acceptable, and the conclusion was that the bellows were fit for use.

Trotter, G.R.; Wu, J.; /Fermilab

1991-03-11

372

Wellbore inertial navigation system (WINS) software development and test results  

SciTech Connect

The structure and operation of the real-time software developed for the Wellbore Inertial Navigation System (WINS) application are described. The procedure and results of a field test held in a 7000-ft well in the Nevada Test Site are discussed. Calibration and instrumentation error compensation are outlined, as are design improvement areas requiring further test and development. Notes on Kalman filtering and complete program listings of the real-time software are included in the Appendices. Reference is made to a companion document which describes the downhole instrumentation package.

Wardlaw, R. Jr.

1982-09-01

373

DSN advanced receiver: Breadboard description and test results  

NASA Technical Reports Server (NTRS)

A breadboard Advanced Receiver for use in the Deep Space Network was designed, built, and tested in the laboratory. Field testing was also performed during Voyager Uranus encounter at DSS-13. The development of the breadboard is intended to lead towards implementation of the new receiver throughout the network. The receiver is described on a functional level and then in terms of more specific hardware and software architecture. The results of performance tests in the laboratory and in the field are given. Finally, there is a discussion of suggested improvements for the next phase of development.

Brown, D. H.; Hurd, W. J.

1987-01-01

374

Construction details and test results from RHIC sextupoles  

SciTech Connect

Four 8 cm aperture sextupoles have been built at BNL to verify the magnetic performance of this magnet in the RHIC installation. Two significantly different mechanical configurations have been designed, and two magnets of each design have been built, and successfully tested, and have exceeded the required minimum quench current by a substantial margin. This report describes the assembly details of the second configuration, which is the final production configuration. In addition the first industry built production sextupole has been delivered and tested. This report presents the results of quench tests on all 5 magnets and field measurements on the first production sextupole.

Lindner, M.; Anerella, M.; Ganetis, G. [and others

1993-12-31

375

Advanced Stirling Convertor Durability Testing: Plans and Interim Results  

NASA Technical Reports Server (NTRS)

The U.S. Department of Energy (DOE), Lockheed Martin Corporation (LM), and NASA Glenn Research Center (GRC) have been developing the Advanced Stirling Radioisotope Generator (ASRG) for use as a power system for space science missions. In support of this program, NASA?s Glenn Research Center (GRC) has been involved in testing Stirling convertors, including the Advanced Stirling Convertor (ASC), for use in the ASRG. This testing includes electromagnetic interference/compatibility (EMI/EMC), structural dynamics, advanced materials, organics, and unattended extended operation. The purpose of the durability tests is to experimentally demonstrate the margins in the ASC design. Due to the high value of the hardware, previous ASC tests focused on establishing baseline performance of the convertors within the nominal operating conditions. The durability tests present the first planned extension of the operating conditions into regions beyond those intended to meet the product spec, where the possibility exists of lateral contact, overstroke, or over-temperature events. These tests are not intended to cause damage that would shorten the life of the convertors, so they can transition into extended operation at the conclusion of the tests. This paper describes the four tests included in the durability test sequence: 1) start/stop cycling, 2) exposure to constant acceleration in the lateral and axial directions, 3) random vibration at increased piston amplitude to induce contact events, and 4) overstroke testing to simulate potential failures during processing or during the mission life where contact events could occur. The paper also summarizes the analysis and simulation used to predict the results of each of these tests.

Meer, Dave; Oriti, Sal

2012-01-01

376

Advanced Tactical Air Reconnaissance System development test and evaluation: RF-4C final flight test results  

NASA Astrophysics Data System (ADS)

Sverdrup Technology Inc., provided technical, engineering, and analytical support for a limited development test and evaluation (DT&E) of the advanced tactical air reconnaissance system (ATARS) at Eglin Air Force Base, Florida. The 46th Electronic Combat Test Squadron, reconnaissance and imaging sensors test flight (46 ECTS/OGER) conducted the test from 12 February to 4 October 1993. This paper presents an overview of the sensor performance test results from this limited DT&E. Detailed results are presented in the U.S. Air Force Development Test Center technical report.

Minor, John L.

1994-10-01

377

Compressive strength after blast of sandwich composite materials.  

PubMed

Composite sandwich materials have yet to be widely adopted in the construction of naval vessels despite their excellent strength-to-weight ratio and low radar return. One barrier to their wider use is our limited understanding of their performance when subjected to air blast. This paper focuses on this problem and specifically the strength remaining after damage caused during an explosion. Carbon-fibre-reinforced polymer (CFRP) composite skins on a styrene-acrylonitrile (SAN) polymer closed-cell foam core are the primary composite system evaluated. Glass-fibre-reinforced polymer (GFRP) composite skins were also included for comparison in a comparable sandwich configuration. Full-scale blast experiments were conducted, where 1.6×1.3?m sized panels were subjected to blast of a Hopkinson-Cranz scaled distance of 3.02?m?kg(-1/3), 100?kg TNT equivalent at a stand-off distance of 14?m. This explosive blast represents a surface blast threat, where the shockwave propagates in air towards the naval vessel. Hopkinson was the first to investigate the characteristics of this explosive air-blast pulse (Hopkinson 1948 Proc. R. Soc. Lond. A 89, 411-413 (doi:10.1098/rspa.1914.0008)). Further analysis is provided on the performance of the CFRP sandwich panel relative to the GFRP sandwich panel when subjected to blast loading through use of high-speed speckle strain mapping. After the blast events, the residual compressive load-bearing capacity is investigated experimentally, using appropriate loading conditions that an in-service vessel may have to sustain. Residual strength testing is well established for post-impact ballistic assessment, but there has been less research performed on the residual strength of sandwich composites after blast. PMID:24711494

Arora, H; Kelly, M; Worley, A; Del Linz, P; Fergusson, A; Hooper, P A; Dear, J P

2014-01-01

378

Compressive strength after blast of sandwich composite materials  

PubMed Central

Composite sandwich materials have yet to be widely adopted in the construction of naval vessels despite their excellent strength-to-weight ratio and low radar return. One barrier to their wider use is our limited understanding of their performance when subjected to air blast. This paper focuses on this problem and specifically the strength remaining after damage caused during an explosion. Carbon-fibre-reinforced polymer (CFRP) composite skins on a styrene–acrylonitrile (SAN) polymer closed-cell foam core are the primary composite system evaluated. Glass-fibre-reinforced polymer (GFRP) composite skins were also included for comparison in a comparable sandwich configuration. Full-scale blast experiments were conducted, where 1.6×1.3?m sized panels were subjected to blast of a Hopkinson–Cranz scaled distance of 3.02?m?kg?1/3, 100?kg TNT equivalent at a stand-off distance of 14?m. This explosive blast represents a surface blast threat, where the shockwave propagates in air towards the naval vessel. Hopkinson was the first to investigate the characteristics of this explosive air-blast pulse (Hopkinson 1948 Proc. R. Soc. Lond. A 89, 411–413 (doi:10.1098/rspa.1914.0008)). Further analysis is provided on the performance of the CFRP sandwich panel relative to the GFRP sandwich panel when subjected to blast loading through use of high-speed speckle strain mapping. After the blast events, the residual compressive load-bearing capacity is investigated experimentally, using appropriate loading conditions that an in-service vessel may have to sustain. Residual strength testing is well established for post-impact ballistic assessment, but there has been less research performed on the residual strength of sandwich composites after blast.

Arora, H.; Kelly, M.; Worley, A.; Del Linz, P.; Fergusson, A.; Hooper, P. A.; Dear, J. P.

2014-01-01

379

Small-Scale Spray Releases: Initial Aerosol Test Results  

SciTech Connect

One of the events postulated in the hazard analysis at the Waste Treatment and Immobilization Plant (WTP) and other U.S. Department of Energy (DOE) nuclear facilities is a breach in process piping that produces aerosols with droplet sizes in the respirable range. The current approach for predicting the size and concentration of aerosols produced in a spray leak involves extrapolating from correlations reported in the literature. These correlations are based on results obtained from small engineered spray nozzles using pure liquids with Newtonian fluid behavior. The narrow ranges of physical properties on which the correlations are based do not cover the wide range of slurries and viscous materials that will be processed in the WTP and across processing facilities in the DOE complex. Two key technical areas were identified where testing results were needed to improve the technical basis by reducing the uncertainty due to extrapolating existing literature results. The first technical need was to quantify the role of slurry particles in small breaches where the slurry particles may plug and result in substantially reduced, or even negligible, respirable fraction formed by high-pressure sprays. The second technical need was to determine the aerosol droplet size distribution and volume from prototypic breaches and fluids, specifically including sprays from larger breaches with slurries where data from the literature are scarce. To address these technical areas, small- and large-scale test stands were constructed and operated with simulants to determine aerosol release fractions and net generation rates from a range of breach sizes and geometries. The properties of the simulants represented the range of properties expected in the WTP process streams and included water, sodium salt solutions, slurries containing boehmite or gibbsite, and a hazardous chemical simulant. The effect of antifoam agents was assessed with most of the simulants. Orifices included round holes and rectangular slots. For the combination of both test stands, the round holes ranged in size from 0.2 to 4.46 mm. The slots ranged from (width × length) 0.3 × 5 to 2.74 × 76.2 mm. Most slots were oriented longitudinally along the pipe, but some were oriented circumferentially. In addition, a limited number of multi-hole test pieces were tested in an attempt to assess the impact of a more complex breach. Much of the testing was conducted at pressures of 200 and 380 psi, but some tests were conducted at 100 psi. Testing the largest postulated breaches was deemed impractical because of the much larger flow rates and equipment that would be required. This report presents the experimental results and analyses for the aerosol measurements obtained in the small-scale test stand. It includes a description of the simulants used and their properties, equipment and operations, data analysis methodologies, and test results. The results of tests investigating the role of slurry particles in plugging small breaches are reported in Mahoney et al. (2012). The results of the aerosol measurements in the large-scale test stand are reported in Schonewill et al. (2012) along with an analysis of the combined results from both test scales.

Mahoney, Lenna A.; Gauglitz, Phillip A.; Kimura, Marcia L.; Brown, Garrett N.; Kurath, Dean E.; Buchmiller, William C.; Smith, Dennese M.; Blanchard, Jeremy; Song, Chen; Daniel, Richard C.; Wells, Beric E.; Tran, Diana N.; Burns, Carolyn A.

2013-05-29

380

Results of Tests on Radiators for Aircraft Engines  

NASA Technical Reports Server (NTRS)

Part 1 is to present the results of tests on 56 types of core in a form convenient for use in the study of the performance of and possible improvements in existing designs. Working rules are given by which the data contained in the report may be used, and the most obvious conclusions as to the behavior of cores are summarized. Part 2 presents the results of tests made to determine the pressure necessary to produce water flows up to 50 gallons per minute through an 8-inch square section of radiator core. These data are of special value in evaluating the hydraulic head against which the circulating pump is required to operate.

Dickinson, H C; James, W S; Kleinschmidt, R V

1920-01-01

381

Multiplexer/amplifier test results for SP-100  

SciTech Connect

Multiplexer and amplifier systems must be designed with transistors that can perform satisfactorily over ten years to a total gamma dose of 120E6 rads and a total neutron fluence of 1.6E15 nvt for the SP-100 reactor system. Series of gamma and neutron tests have been completed to measure transistor degradation as a function of total dose, fluence, and temperature. Test results indicate that modest increases in temperature result in substantial improvement of transistor performance at a neutron flux of 8E8 n/cm{sup 2}/s. 2 refs., 3 figs.

King, D.B.; Luker, S.M. (Sandia National Labs., Albuquerque, NM (USA)); Ryan, R. (General Electric Co., San Jose, CA (USA))

1990-01-01

382

NASA Fastrac Engine Gas Generator Component Test Program and Results  

NASA Technical Reports Server (NTRS)

Low cost access to space has been a long-time goal of the National Aeronautics and Space Administration (NASA). The Fastrac engine program was begun at NASA's Marshall Space Flight Center to develop a 60,000-pound (60K) thrust, liquid oxygen/hydrocarbon (LOX/RP), gas generator-cycle booster engine for a fraction of the cost of similar engines in existence. To achieve this goal, off-the-shelf components and readily available materials and processes would have to be used. This paper will present the Fastrac gas generator (GG) design and the component level hot-fire test program and results. The Fastrac GG is a simple, 4-piece design that uses well-defined materials and processes for fabrication. Thirty-seven component level hot-fire tests were conducted at MSFC's component test stand #116 (TS116) during 1997 and 1998. The GG was operated at all expected operating ranges of the Fastrac engine. Some minor design changes were required to successfully complete the test program as development issues arose during the testing. The test program data results and conclusions determined that the Fastrac GG design was well on the way to meeting the requirements of NASA's X-34 Pathfinder Program that chose the Fastrac engine as its main propulsion system.

Dennis, Henry J., Jr.; Sanders, T.

2000-01-01

383

RE-1000 free-piston Stirling engine sensitivity test results  

NASA Astrophysics Data System (ADS)

The NASA Lewis Research Center has been testing a 1 kW (1.33 hp) free-piston Stirling engine. The tests performed over the past several years have been on a single cylinder machine known as the RE-1000. The data recorded were to aid in the investigation of the dynamics and thermo-dynamics of the free-piston Stirling engine. The data are intended to be used primarily for computer code validation. NASA reports TM-82999, TM-83407, and TM-87126 give initial results of the engine tests. The tests were designed to investigate the sensitivity of the engine performance to variations on the mean pressure of the working space, the working fluid used, heater and cooler temperatures, regenerator porosity, power piston mass and displacer dynamics. These tests have now been completed. Some of the data collected in the sensitivity tests are presented. In all, 781 data points were recorded. A completed description of the engine and test facility is given. Many of the data can be found in tabular form, and a microfiche containing all of the data points can be requested from the NASA Lewis.

Schreiber, Jeffrey G.; Geng, Steven M.; Lorenz, Gary V.

1986-10-01

384

Results of W-87/Mk21 Deployment Separation Shock Tests  

SciTech Connect

This report summarizes results of the W-87/Mk21 Deployment Separation Shock Tests conducted at the Survivability and Vulnerability Integration Center (SVIC) Hill Air Force Base in Ogden, Utah, from 10/5/98 to 10/8/98. Specific details regarding the test plan and procedures can be found in the Master Test Plan listed in the references. Test Objectives: (1) Evaluate the performance of a set of servo accelerometers during and post Re-entry Vehicle (RV) separation events. These ultra-sensitive accelerometers ({mu}g) needed operate during and after the separation shock events and these tests would serve as confirmation of proper functioning. These sensors were later flown on FrU-15, a development flight unit supporting the Instrumented High Fidelity Joint Test Assembly Program, as part of an experimental Inertial Measurement Unit (IMU) measure RV dynamics during RV mechanical separation and spin-up. (2) Measure separation shock response at the IMU accelerometer locations. (3) Measure separation shock response at locations on the warhead and RV common to locations used on MMIII separation tests conducted at LMMS Valley Forge for data comparison.

Avalle, C.A.

1999-04-21

385

Virtex-II Pro SEE Test Methods and Results  

NASA Technical Reports Server (NTRS)

The objective of this coarse Single Event Effect (SEE) test is to determine the suitability of the commercial Virtex-II Pro family for use in spaceflight applications. To this end, this test is primarily intended to determine any Singe Event Latchup (SEL) susceptibilities for these devices. Secondly, this test is intended to measure the level of Single Event Upset (SEU) susceptibilities and in a general sense where they occur. The coarse SEE test was performed on a commercial XC2VP7 device, a relatively small single processor version of the Virtex-II Pro. As the XC2VP7 shares the same functional block design and fabrication process with the larger Virtex-II Pro devices, the results of this test should also be applicable to the larger devices. The XC2VP7 device was tested on a commercial Virtex-II Pro development board. The testing was performed at the Cyclotron laboratories at Texas A&M and Michigan State Universities using ions of varying energy levels and fluences.

Petrick, David; Powell, Wesley; Howard, James W., Jr.; LaBel, Kenneth A.

2004-01-01

386

Large coil task and results of testing US coils  

SciTech Connect

The United States, EURATOM, Japan, and Switzerland have collaborated since 1978 in development of superconducting toroidal field coils for fusion reactor applications. The United States provided a test facility nd three coils; the other participants, one coil each. All coils have the same interface dimensions and performance requirements (stable at 8 T), but internal design was decided by each team. Two US coil teams chose bath-cooled NbTi, 10-kA conductors. One developed a Nb/sub 3/Sn conductor, cooled by internal flow, rated at 18 kA. All US coils have diagnostic instrumentation and imbedded heaters that enable stability tests and simulated nuclear heating experiments. In single-coil tests, each coil operated at full current in self-field (6.4 T). In six-coil tests that began in July 1986, one US coil and the Japanese coil hve been successfully operated at full current at 8 T. The other coils have operated as background coils while awaiting their turn as test coil. Coil tests have been informative and results gratifying. The facility has capably supported coil testing and its operation has provided information that will be useful in designing future fusion systems. Coil capabilities beyond nominal design points will be determined.

Haubenreich, P.N.

1986-01-01

387

Altered Gene Expression in Cultured Microglia in Response to Simulated Blast Overpressure: Possible Role of Pulse Duration  

PubMed Central

Blast overpressure has long been known to cause barotrauma to air-filled organs such as lung and middle ear. However, experience in Iraq and Afghanistan is revealing that individuals exposed to explosive munitions can also suffer traumatic brain injury (TBI) even in the absence of obvious external injury. The interaction of a blast shock wave with the brain in the intact cranial vault is extremely complex making it difficult to conclude that a blast wave interacts in a direct manner with the brain to cause injury. In an attempt to “isolate” the shock wave and test its primary effects on cells, we exposed cultured microglia to simulated blast overpressure in a barochamber. Overpressures ranging from 15–45 psi did not change microglial Cox-2 levels or TNF-? secretion nor did they cause cell damage. Microarray analysis revealed increases in expression of a number of microglial genes relating to immune function and inflammatory responses to include Saa3, Irg1, Fas and CxCl10. All changes in gene expression were dependent on pulse duration and were independent of pressure. These results indicate that microglia are mildly activated by blast overpressure and uncover a heretofore undocumented role for pulse duration in this process.

Kane, Michael J.; Angoa-Perez, Mariana; Francescutti, Dina M.; Sykes, Catherine E.; Briggs, Denise I.; Leung, Lai Yee; VandeVord, Pamela J.; Kuhn, Donald M.

2012-01-01

388

The advanced receiver 2: Telemetry test results in CTA 21  

NASA Technical Reports Server (NTRS)

Telemetry tests with the Advanced Receiver II (ARX II) in Compatibility Test Area 21 are described. The ARX II was operated in parallel with a Block-III Receiver/baseband processor assembly combination (BLK-III/BPA) and a Block III Receiver/subcarrier demodulation assembly/symbol synchronization assembly combination (BLK-III/SDA/SSA). The telemetry simulator assembly provided the test signal for all three configurations, and the symbol signal to noise ratio as well as the symbol error rates were measured and compared. Furthermore, bit error rates were also measured by the system performance test computer for all three systems. Results indicate that the ARX-II telemetry performance is comparable and sometimes superior to the BLK-III/BPA and BLK-III/SDA/SSA combinations.

Hinedi, S.; Bevan, R.; Marina, M.

1991-01-01

389

PFR fuel cladding transient test results and analysis  

NASA Astrophysics Data System (ADS)

Fuel Cladding Transient Tests (FCTT) were performed on M316 cladding specimens obtained from mixed-oxide fuel pins irradiated in the Prototype Fast Reactor (PFR) to burnups of 4 and 9 atom percent. In these tests, specimens of fuel cladding were pressurized and heated until failure occurred. Samples of cladding from PFR fuel pins exhibited generally greater strength and ductility than specimens from Experimental Breeder Reactor-II (EBR-II) mixed-oxide fuel pins tested under similar conditions. Apparently, the PFR cladding properties were not degraded by a fuel adjacency effect (FAE) observed in fuel pin cladding from EBR-II irradiations. A recently developed model of grain boundary cavity growth was used to predict the results of the tests conducted on PFR cladding. It was found that the predicted failure temperatures for the relevant internal pressures were in good agreement with experimental failure temperatures.

Cannon, N. S.; Hunter, C. W.; Kear, K. L.; Wood, M. H.

1986-05-01

390

High Stability Engine Control (HISTEC) Flight Test Results  

NASA Technical Reports Server (NTRS)

The High Stability Engine Control (HISTEC) Program, managed and funded by the NASA Lewis Research Center, is a cooperative effort between NASA and Pratt & Whitney (P&W). The program objective is to develop and flight demonstrate an advanced high stability integrated engine control system that uses real-time, measurement-based estimation of inlet pressure distortion to enhance engine stability. Flight testing was performed using the NASA Advanced Controls Technologies for Integrated Vehicles (ACTIVE) F-15 aircraft at the NASA Dryden Flight Research Center. The flight test configuration, details of the research objectives, and the flight test matrix to achieve those objectives are presented. Flight test results are discussed that show the design approach can accurately estimate distortion and perform real-time control actions for engine accommodation.

Southwick, Robert D.; Gallops, George W.; Kerr, Laura J.; Kielb, Robert P.; Welsh, Mark G.; DeLaat, John C.; Orme, John S.

1998-01-01

391

CSI computer system/remote interface unit acceptance test results  

NASA Technical Reports Server (NTRS)

The validation tests conducted on the Control/Structures Interaction (CSI) Computer System (CCS)/Remote Interface Unit (RIU) is discussed. The CCS/RIU consists of a commercially available, Langley Research Center (LaRC) programmed, space flight qualified computer and a flight data acquisition and filtering computer, developed at LaRC. The tests were performed in the Space Structures Research Laboratory (SSRL) and included open loop excitation, closed loop control, safing, RIU digital filtering, and RIU stand alone testing with the CSI Evolutionary Model (CEM) Phase-0 testbed. The test results indicated that the CCS/RIU system is comparable to ground based systems in performing real-time control-structure experiments.

Sparks, Dean W., Jr.

1992-01-01

392

Small-Scale Spray Releases: Initial Aerosol Test Results  

SciTech Connect

One of the events postulated in the hazard analysis at the Waste Treatment and Immobilization Plant (WTP) and other U.S. Department of Energy (DOE) nuclear facilities is a breach in process piping that produces aerosols with droplet sizes in the respirable range. The current approach for predicting the size and concentration of aerosols produced in a spray leak involves extrapolating from correlations reported in the literature. These correlations are based on results obtained from small engineered spray nozzles using pure liquids with Newtonian fluid behavior. The narrow ranges of physical properties on which the correlations are based do not cover the wide range of slurries and viscous materials that will be processed in the WTP and across processing facilities in the DOE complex. Two key technical areas were identified where testing results were needed to improve the technical basis by reducing the uncertainty due to extrapolating existing literature results. The first technical need was to quantify the role of slurry particles in small breaches where the slurry particles may plug and result in substantially reduced, or even negligible, respirable fraction formed by high-pressure sprays. The second technical need was to determine the aerosol droplet size distribution and volume from prototypic breaches and fluids, specifically including sprays from larger breaches with slurries where data from the literature are scarce. To address these technical areas, small- and large-scale test stands were constructed and operated with simulants to determine aerosol release fractions and generation rates from a range of breach sizes and geometries. The properties of the simulants represented the range of properties expected in the WTP process streams and included water, sodium salt solutions, slurries containing boehmite or gibbsite, and a hazardous chemical simulant. The effect of anti-foam agents was assessed with most of the simulants. Orifices included round holes and rectangular slots. The round holes ranged in size from 0.2 to 4.46 mm. The slots ranged from (width × length) 0.3 × 5 to 2.74 × 76.2 mm. Most slots were oriented longitudinally along the pipe, but some were oriented circumferentially. In addition, a limited number of multi-hole test pieces were tested in an attempt to assess the impact of a more complex breach. Much of the testing was conducted at pressures of 200 and 380 psi, but some tests were conducted at 100 psi. Testing the largest postulated breaches was deemed impractical because of the large size of some of the WTP equipment. This report presents the experimental results and analyses for the aerosol measurements obtained in the small-scale test stand. It includes a description of the simulants used and their properties, equipment and operations, data analysis methodologies, and test results. The results of tests investigating the role of slurry particles in plugging small breaches are reported in Mahoney et al. (2012). The results of the aerosol measurements in the large-scale test stand are reported in Schonewill et al. (2012) along with an analysis of the combined results from both test scales.

Mahoney, Lenna A.; Gauglitz, Phillip A.; Kimura, Marcia L.; Brown, Garrett N.; Kurath, Dean E.; Buchmiller, William C.; Smith, Dennese M.; Blanchard, Jeremy; Song, Chen; Daniel, Richard C.; Wells, Beric E.; Tran, Diana N.; Burns, Carolyn A.

2012-11-01

393

Wind tunnel test IA300 analysis and results, volume 1  

NASA Technical Reports Server (NTRS)

The analysis and interpretation of wind tunnel pressure data from the Space Shuttle wind tunnel test IA300 are presented. The primary objective of the test was to determine the effects of the Space Shuttle Main Engine (SSME) and the Solid Rocket Booster (SRB) plumes on the integrated vehicle forebody pressure distributions, the elevon hinge moments, and wing loads. The results of this test will be combined with flight test results to form a new data base to be employed in the IVBC-3 airloads analysis. A secondary objective was to obtain solid plume data for correlation with the results of gaseous plume tests. Data from the power level portion was used in conjunction with flight base pressures to evaluate nominal power levels to be used during the investigation of changes in model attitude, eleveon deflection, and nozzle gimbal angle. The plume induced aerodynamic loads were developed for the Space Shuttle bases and forebody areas. A computer code was developed to integrate the pressure data. Using simplified geometrical models of the Space Shuttle elements and components, the pressure data were integrated to develop plume induced force and moments coefficients that can be combined with a power-off data base to develop a power-on data base.

Kelley, P. B.; Beaufait, W. B.; Kitchens, L. L.; Pace, J. P.

1987-01-01

394

Blast furnace injection symposium: Proceedings  

SciTech Connect

These proceedings contain 14 papers related to blast furnace injection issues. Topics include coal quality, coal grinding, natural gas injection, stable operation of the blast furnace, oxygen enrichment, coal conveying, and performance at several steel companies. All papers have been processed separately for inclusion on the data base.

NONE

1996-12-31

395

HIGH PRODUCTIVITY VACUUM BLASTING SYSTEM  

SciTech Connect

The purpose of the project is to increase the productivity and economics of existing vacuum blasting technology. This technology is used to remove radioactive contamination, PCB's and lead-base paint and provides worker and environmental protection by continuously recycling the blast media and the full containment of the dust generated in the process.

Dr. M.A. Ebadian

2000-01-13

396

Propagation of Nonideal Blast Waves.  

National Technical Information Service (NTIS)

The propagation of non-ideal blast waves initiated by finite power density sources has been classified into three regimes. The early-time motion of a non-ideal blast reflects the characteristics of the energy-time profile of the particular initiation ener...

C. M. Guirao G. G. Bach J. H. Lee

1974-01-01

397

Large mining blasts from the Kursk Mining Region, Russia  

SciTech Connect

Monitoring the Comprehensive Nuclear Test Ban Treaty (CTBT) by seismic means will require identification of seismic sources at magnitude levels where industrial explosions (primarily, mining blasts) may comprise a significant fraction of the total number of events recorded, and may for some countries dominate the seismicity. Thus, data on blasting practice have both political significance for the negotiation of treaties involving seismic monitoring of nuclear tests, and operational applications in terms of establishing monitoring and inspection needs on a mine-by-mine basis. While it is generally accepted that mining explosions contribute to seismicity at lower seismic magnitudes (less than about magnitude 3.5), the rate of mining seismicity as a function of seismic magnitude is unknown for most countries outside the U.S. This results in a large uncertainty when estimating the task of discriminating nuclear explosions from chemical explosions and earthquakes, by seismic means, under a comprehensive nuclear test ban. This uncertainty directly affects estimates of seismic network enhancements required to achieve treaty verification requirements at magnitudes less than about 3.5. 24 refs., 64 figs., 11 tabs.

Leith, W. Adushkin, V.; Spivak, A.

1997-01-01

398

Prognostic impact of day 15 blast clearance in risk-adapted remission induction chemotherapy for younger patients with acute myeloid leukemia: long-term results of the multicenter prospective LAM-2001 trial by the GOELAMS study group  

PubMed Central

Early response to chemotherapy has a major prognostic impact in acute myeloid leukemia patients treated with a double induction strategy. Less is known about patients treated with standard-dose cytarabine and anthracycline. We designed a risk-adapted remission induction regimen in which a second course of intermediate-dose cytarabine was delivered after standard “7+3” only if patients had 5% or more bone marrow blasts 15 days after chemotherapy initiation (d15-blasts). Of 823 included patients, 795 (96.6%) were evaluable. Five hundred and forty-five patients (68.6%) had less than 5% d15-blasts. Predictive factors for high d15-blasts were white blood cell count (P<0.0001) and cytogenetic risk (P<0.0001). Patients with fewer than 5% d15-blasts had a higher complete response rate (91.7% vs. 69.2%; P<0.0001) and a lower induction death rate (1.8% vs. 6.8%; P=0.001). Five-year event-free (48.4% vs. 25%; P<0.0001), relapse-free (52.7% vs. 36.9%; P=0.0016) and overall survival (55.3% vs. 36.5%; P<0.0001) were significantly higher in patients with d15-blasts lower than 5%. Multivariate analyses identified d15-blasts and cytogenetic risk as independent prognostic factors for the three end points. Failure to achieve early blast clearance remains a poor prognostic factor even after early salvage. By contrast, early responding patients have a favorable outcome without any additional induction course. (ClinicalTrials.gov identifier NCT01015196)

Bertoli, Sarah; Bories, Pierre; Bene, Marie C.; Daliphard, Sylvie; Lioure, Bruno; Pigneux, Arnaud; Vey, Norbert; Delaunay, Jacques; Leymarie, Vincent; Luquet, Isabelle; Blanchet, Odile; Cornillet-Lefebvre, Pascale; Hunault, Mathilde; Bouscary, Didier; Fegueux, Nathalie; Guardiola, Philippe; Dreyfus, Francois; Harousseau, Jean Luc; Cahn, Jean Yves; Ifrah, Norbert; Recher, Christian

2014-01-01

399

Prognostic impact of day 15 blast clearance in risk-adapted remission induction chemotherapy for younger patients with acute myeloid leukemia: long-term results of the multicenter prospective LAM-2001 trial by the GOELAMS study group.  

PubMed

Early response to chemotherapy has a major prognostic impact in acute myeloid leukemia patients treated with a double induction strategy. Less is known about patients treated with standard-dose cytarabine and anthracycline. We designed a risk-adapted remission induction regimen in which a second course of intermediate-dose cytarabine was delivered after standard "7+3" only if patients had 5% or more bone marrow blasts 15 days after chemotherapy initiation (d15-blasts). Of 823 included patients, 795 (96.6%) were evaluable. Five hundred and forty-five patients (68.6%) had less than 5% d15-blasts. Predictive factors for high d15-blasts were white blood cell count (P<0.0001) and cytogenetic risk (P<0.0001). Patients with fewer than 5% d15-blasts had a higher complete response rate (91.7% vs. 69.2%; P<0.0001) and a lower induction death rate (1.8% vs. 6.8%; P=0.001). Five-year event-free (48.4% vs. 25%; P<0.0001), relapse-free (52.7% vs. 36.9%; P=0.0016) and overall survival (55.3% vs. 36.5%; P<0.0001) were significantly higher in patients with d15-blasts lower than 5%. Multivariate analyses identified d15-blasts and cytogenetic risk as independent prognostic factors for the three end points. Failure to achieve early blast clearance remains a poor prognostic factor even after early salvage. By contrast, early responding patients have a favorable outcome without any additional induction course. (ClinicalTrials.gov identifier NCT01015196). PMID:23975179

Bertoli, Sarah; Bories, Pierre; Béné, Marie C; Daliphard, Sylvie; Lioure, Bruno; Pigneux, Arnaud; Vey, Norbert; Delaunay, Jacques; Leymarie, Vincent; Luquet, Isabelle; Blanchet, Odile; Cornillet-Lefebvre, Pascale; Hunault, Mathilde; Bouscary, Didier; Fegueux, Nathalie; Guardiola, Philippe; Dreyfus, François; Harousseau, Jean Luc; Cahn, Jean Yves; Ifrah, Norbert; Récher, Christian

2014-01-01

400

Operational Results From a High Power Alternator Test Bed  

NASA Technical Reports Server (NTRS)

The Alternator Test Unit (ATU) in the Lunar Power System Facility (LPSF) located at the NASA Glenn Research Center (GRC) in Cleveland, Ohio was used to simulate the operating conditions and evaluate the performance of the ATU and its interaction with various LPSF components in accordance with the current Fission Surface Power System (FSPS) requirements. The testing was carried out at the breadboard development level. These results successfully demonstrated excellent ATU power bus characteristics and rectified user load power quality during steady state and transient conditions. Information gained from this work could be used to assist the design and primary power quality considerations for a possible future FSPS. This paper describes the LPSF components and some preliminary test results.

Birchenough, Arthur; Hervol, David

2007-01-01

401

Test results of a shower water recovery system  

NASA Technical Reports Server (NTRS)

A shower test was conducted recently at NASA-JSC in which waste water was reclaimed and reused. Test subjects showered in a prototype whole body shower following a protocol similar to that anticipated for Space Station. The waste water was purified using reverse osmosis followed by filtration through activated carbon and ion exchange resin beds. The reclaimed waste water was maintained free of microorganisms by using both heat and iodine. This paper discusses the test results, including the limited effectiveness of using iodine as a disinfectant and the evaluation of a Space Station candidate soap for showering. In addition, results are presented on chemical and microbial impurity content of water samples obtained from various locations in the water recovery process.

Verostko, Charles E.; Price, Donald F.; Garcia, Rafael; Pierson, Duane L.; Sauer, Richard L.

1987-01-01

402

Infrared sensor system (IRSS) laboratory and field test results  

NASA Astrophysics Data System (ADS)

The U.S. Navy Office of Naval Research (ONR) has developed an infrared search and track (IRST) demonstrator system named the infrared sensor system (IRSS). This technology-base sensor was successfully developed and tested both in the laboratory and at-sea. IRSS now is being transitioned to the Naval Sea Systems Command (NAUSEA) IRST Engineering and Manufacturing Development (E&MD) Program, where it will serve, with appropriate modifications, as the engineering development model (EDM) and will be fielded aboard a U.S. Navy ship. This paper summarizes the process of developing and fielding IRSS, describes test results accomplished at sea during 1996, and discusses the technical and engineering lessons associated with design, development and testing of IRSS. Results are presented covering the areas of sensor component and overall system radiometrics (e.g., sensitivity and dynamic range), channel uniformity, stabilization, and optical, electrical and information (i.e., signal processing/track) resolution.

Ax, George R.; Buss, James R.

1997-08-01

403

Physics of IED Blast Shock Tube Simulations for mTBI Research.  

PubMed

Shock tube experiments and simulations are conducted with a spherical gelatin filled skull-brain surrogate, in order to study the mechanisms leading to blast induced mild traumatic brain injury. A shock tube including sensor system is optimized to simulate realistic improvised explosive device blast profiles obtained from full scale field tests. The response of the skull-brain surrogate is monitored using pressure and strain measurements. Fluid-structure interaction is modeled using a combination of computational fluid dynamics (CFD) simulations for the air blast, and a finite element model for the structural response. The results help to understand the physics of wave propagation, from air blast into the skull-brain. The presence of openings on the skull and its orientation does have a strong effect on the internal pressure. A parameter study reveals that when there is an opening in the skull, the skull gives little protection and the internal pressure is fairly independent on the skull stiffness; the gelatin shear stiffness has little effect on the internal pressure. Simulations show that the presence of pressure sensors in the gelatin hardly disturbs the pressure field. PMID:21960984

Mediavilla Varas, Jesus; Philippens, M; Meijer, S R; van den Berg, A C; Sibma, P C; van Bree, J L M J; de Vries, D V W M

2011-01-01

404

Neuropsychological outcomes in OEF/OIF veterans with self-report of blast exposure: Associations with mental health, but not MTBI.  

PubMed

Objective: To examine neuropsychological outcomes in veterans of Operations Enduring and Iraqi Freedom (OEF/OIF) with self-reported histories of blast exposure and determine the contribution of deployment-related mild traumatic brain injury (mTBI), and posttraumatic stress disorder (PTSD) and depression to performance. The effect of number of blast exposures and distance from the blast was also assessed. Method: OEF/OIF veterans who reported exposure to blast underwent structured interviews and were assigned to no-TBI (n = 39), mTBI without loss of consciousness (LOC; n = 53), or mTBI with LOC (n = 35) groups. They were administered tests of executive function, memory, and motor function at least 6 months after the index event. Results: Neuropsychological outcomes did not differ as a function of mTBI group. Blast load and distance from the blast also did not affect neuropsychological performance. Both PTSD and depression symptoms were significantly associated with neuropsychological outcomes. Conclusions: A history of mTBI with or without LOC during deployment does not contribute to objective cognitive impairment in the chronic phase post injury. In contrast, PTSD and depression symptoms are associated with cognitive performance decrements. This finding is thought to reflect at least in part the impact of psychiatric distress on neuropsychological performance. (PsycINFO Database Record (c) 2014 APA, all rights reserved). PMID:24245929

Verfaellie, Mieke; Lafleche, Ginette; Spiro, Avron; Bousquet, Kathryn

2014-05-01

405

Blast resistance of prismatic sandwich structures  

NASA Astrophysics Data System (ADS)

Metallic sandwich panels have emerged as candidate blast resistant structures that can be tailored to contain damage from impulsive loads of the type typically generated by explosives. When such panels are impulsively loaded, the stresses imposed by the core on the front face, as well as those transmitted through the core, govern the response metrics: especially the center displacement, the resistance to tearing and the loads transmitted to the supports. Prismatic cores such as I-, X-, Y- and Z- cores differ from other cores, such as foams and trusses, in that they do not exhibit constant dynamic crush strength, enabling collapse to occur in a controlled manner. Establishing relationships between core topology crushing response and panel performance is one of the major goals of this research. For this purpose a gas gun instrumented with high speed photography and direct impact Hopkinson pressure bar was built and used to perform laboratory scale high-speed impact tests. Samples of representative prismatic core unit cells were manufactured and tested in compression at axial velocities ranging from quasi-static to 200m/s. The dynamic strength and deformation (buckling) were measured and used to calibrate the imperfections in a finite element model. The model was then used to validate a constitutive model that can be used to predict the blast resistance of prismatic sandwich structures. This research identifies a simple dual level dynamic strength as a common response in metallic prismatic cores. This is due to the dominant effect of plastic shock generated by dynamic loading. Furthermore, it justifies the use of a simple dynamic axial compression test for calibration of the dynamic strength of the core. An analytical model that accounts for the shock effects in a homogenized core and embodies the dual-level dynamic strength is presented. It is shown to capture the experimental observations and simulated results with acceptable fidelity. This model provides the basis for a constitutive model that can be used to understand the response of sandwich plates subject to impulsive loads.

Ferri, Enrico

406

First Test Results of the New LANSCE Wire Scanner  

SciTech Connect

The Beam Diagnostics and Instrumentation Team (BDIT) at Los Alamos National Laboratory's LANSCE facility is presently developing a new and improved wire scanner diagnostics system controlled by National Instrument's cRIO platform. This paper describes the current state of development of the control system along with the results gathered from the latest actuator motion performance and accelerator-beam data acquisition tests.

Sedillo, James Daniel [Los Alamos National Laboratory

2011-01-01

407

Update on Results of SPRE Testing at NASA Lewis.  

National Technical Information Service (NTIS)

The Space Power Research Engine (SPRE), a free-piston Stirling engine with a linear alternator, is being tested at NASA Lewis Research Center as part of the Civilian Space Technology Initiative (CSTI) as a candidate for high capacity space power. Results ...

J. E. Cairelli, D. M. Swec, W. A. Wong, T. J. Doeberling, F. J. Madi

1991-01-01

408

Using Standardized Test Results To Assess Student Learning.  

ERIC Educational Resources Information Center

One method used by Alabama's Snead State Community College (SSCC) to measure student learning is to compare student scores on placement exams, taken before core course work, to results from evaluation exams, taken upon completion of core courses. All incoming freshmen are required to provide scores from American College Testing (ACT) assessment…

Cooper, Elizabeth L.

409

Effects of vessel geometric irregularity on dissolution test results.  

PubMed

Dissolution testing of pharmaceutical products is an important technique used extensively for both product development and quality control, but there are many variables that can affect dissolution results. In this study, the effect of the inner shape of standard 1-L dissolution vessels on drug dissolution results was investigated. The geometric dimensions and irregularities of commercially available vessels (obtained from four different manufacturers) were examined using a three-dimensional video-based measuring machine (VMM). The same analyst, dissolution test assembly, and experimental conditions were used for dissolution testing involving 10 mg of prednisone tablets (NCDA #2) with dissolution apparatus 2 (paddle). Mechanical calibration of the dissolution apparatus was performed prior to dissolution testing with each set of vessels. Geometric characteristics varied within and among the sets of vessels, but the overall averages and standard deviations of dissolution results (six vessels) showed no statistical significant differences among the vessel sets. However, some dissolution differences were noted when comparing individual vessels. With these types of comparisons, the vessel concentricity, sphericity, and radius of sphere were found to possibly influence the amount of prednisone dissolved, but flatness of vessel flange, cylindricity, and circularity showed no effect on dissolution results. The study shows that VMM is a technique that could be used to qualify dissolution vessels. PMID:20803604

Gao, Zongming; Ahadi, Shafiq; Moore, Terry W; Doub, William H; Westenberger, B J; Buhse, Lucinda F

2011-03-01

410

RESULTS: INTERLABORATORY COMPARISON - BIOCONCENTRATION TESTS USING EASTERN OYSTERS  

EPA Science Inventory

The report summarizes the results of an interlaboratory comparison for bioconcentration (BCF) testing using the eastern oyster (Crassostrea virginica) and the organic chemicals pentachlorophenol (PCP), 1,2,4-trichlorobenzene (TCB), and p, p'-DDE. The means BCFs and high to low BC...

411

SSPS results of test and operation, 1981-1984  

SciTech Connect

The results of three years of testing and operation of the two dissimilar solar thermal power plants of the SSPS project are summarized. The project includes: (1) a Distributed Collector System, and (2) a Central Receiver System. Environmental conditions are presented and an economical assessment of the project is provided. (BCS)

none,

1985-05-01

412

Results of Sandia National Laboratories grid-tied inverter testing  

SciTech Connect

This paper proposes a definition for a Non-Islanding Inverter. This paper also presents methods that can be used to implement such an inverter, along with references to prior work on the subject. Justification for the definition is provided on both a theoretical basis and results from tests conducted at Sandia National Laboratories and Ascension Technology, Inc.

Kern, G.A. [Ascension Technology, Inc., Boulder, CO (United States); Bonn, R.H.; Ginn, J.; Gonzalez, S. [Sandia National Labs., Albuquerque, NM (United States)

1998-07-01

413

ATLAS Transition Radiation Tracker test-beam results  

NASA Astrophysics Data System (ADS)

Several prototypes of the Transition Radiation Tracker for the ATLAS experiment at the LHC have been built and tested at the CERN SPS accelerator. Results from detailed studies of the straw-tube hit registration efficiency and drift-time measurements and of the pion and electron spectra without and with radiators are presented.

Akesson, T.; Arik, E.; Baker, K.; Baron, S.; Benjamin, D.; Bertelsen, H.; Bondarenko, V.; Bytchkov, V.; Callahan, J.; Capeans, M.; Cardiel-Sas, L.; Catinaccio, A.; Cetin, S. A.; Cwetanski, P.; Dam, M.; Danielsson, H.; Dittus, F.; Dolgoshein, B.; Dressnandt, N.; Driouichi, C.; Ebenstein, W. L.; Eerola, P.; Farthouat, P.; Fedin, O.; Froidevaux, D.; Gagnon, P.; Grichkevitch, Y.; Grigalashvili, N.; Hajduk, Z.; Hansen, P.; Kayumov, F.; Keener, P. T.; Kekelidze, G.; Khristatchev, A.; Konovalov, S.; Koudine, L.; Kovalenko, S.; Kowalski, T.; Kramarenko, V. A.; Kruger, K.; Laritchev, A.; Lichard, P.; Luehring, F.; Lundberg, B.; Maleev, V.; Markina, I.; McFarlane, K.; Mialkovski, V.; Mitsou, V. A.; Mindur, B.; Morozov, S.; Munar, A.; Muraviev, S.; Nadtochy, A.; Newcomer, F. M.; Ogren, H.; Oh, S. H.; Oleshko, S.; Olszowska, J.; Passmore, S.; Patritchev, S.; Peshekhonov, V.; Petti, R.; Price, M.; Rembser, C.; Rohne, O.; Romaniouk, A.; Rust, D. R.; Ryabov, Yu.; Schegelsky, V.; Seliverstov, D.; Shin, T.; Shmeleva, A.; Smirnov, S.; Sosnovtsev, V.; Soutchkov, V.; Spiridenkov, E.; Tikhomirov, V.; Van Berg, R.; Vassilakopoulos, V.; Vassilieva, L.; Wang, C.; Williams, H. H.; Zalite, A.

2004-04-01

414

Inverse Square Law Test - Preliminary Results of Ljubljana Experiment  

NASA Astrophysics Data System (ADS)

The inverse square law is tested in a series of null experiments whereby the gravitational torque on a Cavendish balance due to a couple of large masses is balanced by a closer couple of two small masses. The experimental set-up and preliminary results are presented.

Kotar, Jurij; ?adež, Andrej

2006-02-01

415

Impact on HIV test providers of giving a positive test result.  

PubMed

The provision of a positive HIV antibody test result and the direction and support given to the test recipient are critical components of care and prevention. There has been little research that describes what happens in such interactions between recipient and provider. The impact on the test provider of delivering the HIV test result is an important issue to consider. The discomfort experienced by some health providers in giving a positive test result may have adverse effects on the client interaction or may carry over into subsequent client interactions. Utilizing a thematic analysis on interview data from 24 HIV test providers, we describe the impact of delivering a positive test result on HIV test providers, identify the factors that influence this impact, and describe strategies used to manage the impact. As with other health care professionals communicating "bad news,"HIV test providers experience a variety of impacts. While a small number of providers indicated little or no impact of delivering the HIV positive test result because the diagnosis is ''not the end of the world,'' most indicated it was difficult as it was anticipated that the test recipient would (or did) find the news distressing. Several coping strategies were identified. PMID:17851998

Myers, Ted; Worthington, Catherine; Aguinaldo, Jeffrey P; Haubrich, Dennis J; Ryder, Karen; Rawson, Brian

2007-09-01

416

Stable operation for No. 1 blast furnace at Baosteel  

SciTech Connect

Until Sept. 1994, No. 1 blast furnace in Baoshan Steel (Group) Co. had been operating successfully with high productivity. At present, it still keeps its strong potential for production capacity. The philosophy and methodology of the efficient blast furnace operation will be described. The most important aspect for stable operation and long campaign life of a blast furnace is reasonable gas flow distribution in the furnace. The topics to be discussed include: introduction to ironmaking in Baosteel; operational results; experience of stable operation, philosophy, gas distribution control, stabilization raw material property, furnace maintenance and supervision system.

Cai, X.; Lu, S. [Baoshan Steel Corp., Shanghai (China)

1995-07-01

417

Blasting-induced seismicity in the European part of Russia  

NASA Astrophysics Data System (ADS)

The paper focuses on the increasing contribution of blasting operations to the energy balance of seismic processes. Although the progress in blasting technologies will not produce energy outputs that exceed the energy of natural earthquakes on a global scale, it is shown that in some cases, the regional contribution to seismic energy release by blasting operations is by a few orders of magnitude higher than the energy released by natural earthquakes. In particular, this is valid for the European part of Russia, which is characterized by reasonably weak natural seismic activity. In order to identify the sources of natural seismicity over the European territory of Russia, we present the classification of the industrial blasting operations. The spatial distribution of explosive activities is presented; the consumption of explosives is estimated; and the technology of short-delay mass explosions, which might be helpful for interpretation of seismic records, is described. Zoning the territory of the European part of Russia in terms of the release rate of seismic energy and the peak local magnitudes observed during blasting operations is carried out. It is shown that the hazard level associated with blasting activities does not exceed the corresponding parameters of seismic zoning. The results presented in this paper will probably be useful for solving an important question of seismological studies: is the recorded seismic event a blast or earthquake?

Adushkin, V. V.

2013-03-01

418

State of the Art of Blast Resistant Windows.  

National Technical Information Service (NTIS)

Over the past decade a reliable, but possibly conservative, practice has evolved for the design of blast resistant window systems. Herein, the procedure for glazing design is first summarized. This is then comprehensively compared to the results of variou...

D. Baldwin G. E. Meyers P. Mlakar

1994-01-01

419

Graphite electrode arc melter demonstration Phase 2 test results  

SciTech Connect

Several U.S. Department of Energy organizations and the U.S. Bureau of Mines have been collaboratively conducting mixed waste treatment process demonstration testing on the near full-scale graphite electrode submerged arc melter system at the Bureau`s Albany (Oregon) Research Center. An initial test series successfully demonstrated arc melter capability for treating surrogate incinerator ash of buried mixed wastes with soil. The conceptual treatment process for that test series assumed that buried waste would be retrieved and incinerated, and that the incinerator ash would be vitrified in an arc melter. This report presents results from a recently completed second series of tests, undertaken to determine the ability of the arc melter system to stably process a wide range of {open_quotes}as-received{close_quotes} heterogeneous solid mixed wastes containing high levels of organics, representative of the wastes buried and stored at the Idaho National Engineering Laboratory (INEL). The Phase 2 demonstration test results indicate that an arc melter system is capable of directly processing these wastes and could enable elimination of an up-front incineration step in the conceptual treatment process.

Soelberg, N.R.; Chambers, A.G.; Anderson, G.L.; O`Connor, W.K.; Oden, L.L.; Turner, P.C.

1996-06-01

420

A Proposal Regarding Reporting of in Vitro Testing Results  

PubMed Central

The high rate of negative clinical trials and failed drug development programs calls into question the utility of preclinical testing as currently practiced. An important issue for the in vitro testing of agents that have advanced into the clinic is the use of clinically irrelevant concentrations in reports making claims for anticancer activity, as illustrated by publications for sorafenib, vorinostat, and metformin. For sorafenib, high protein binding leads to a dichotomy between concentrations active in the 10% serum conditions commonly used for in vitro testing and concentrations active in plasma. Failure to recognize this distinction leads to inappropriate claims of activity for sorafenib based on the micromolar concentrations commonly used for in vitro testing in low serum conditions. For vorinostat and metformin, results using in vitro concentrations higher than those achievable in patients are reported despite the availability of publications describing human pharmacokinetic data for each agent. We encourage journal editors and reviewers to pay greater attention to clinically relevant concentrations when considering reports that include in vitro testing of agents for which human pharmacokinetic data are available. Steps taken to more carefully scrutinize activity claims based on in vitro results can help direct researchers away from clinically irrelevant lines of research and toward lines of research that are more likely to lead to positive clinical trials and to improved treatments for cancer patients.

Smith, Malcolm A.; Houghton, Peter

2013-01-01

421

Results of MACE tests M0 and M1  

SciTech Connect

This document discusses the Melt Attack and Coolability Experiment (MACE) Program underway at Argonne National Laboratory under ACE/EPRI sponsorship. The program addresses the efficacy of water to terminate an accident situation if melt progression were to result in a molten core/concrete interaction (MCCI) in the reactor containment. Large-scale experiments are being conducted in parallel with related modeling efforts, involving the addition of water to an MCI already underway. The experiments utilize UO{sub 2}/ZrO{sub 2}/Zr corium mixtures, direct electrical heating for simulation of decay heating, and various types of concrete basemats. Currently the tests involve 430 kg corium mass, 25 cm depth, in a 50 cm square test section. Test MO was a successful scoping test, but the first full size test, Ml, failed to achieve melt-water contact owing to existence of a preexisting bridge crust of corium charge. A heat flux of 3.5 MW/m{sup 2} was measured in MO which removed energy from the corium pool equivalent to its entire heat of solidification prior to abatement by formation of an interfacial crust. The crust subsequently limited heat extraction to 600 kW/m{sup 2} and less. Both tests MO and Ml revealed physical evidence of large pool swelling events which resulted in extrusion (and ejection) of melt into water above the crust, significantly increasing the overall quench and reducing the remaining melt in contact with the concrete. Furthermore, test Ml provided evidence of occasional ``burst mode`` ablation events and one additional important benefit of overlying water -- aerosol capture.

Spencer, B.W.; Farmer, M.T.; Armstrong, D.R.; Kilsdonk, D.J.; Aeschlimann, R.W. [Argonne National Lab., IL (United States); Fischer, M. [Siemens AG, Berlin (Germany)

1992-04-01

422

Results of MACE tests M0 and M1  

SciTech Connect

This document discusses the Melt Attack and Coolability Experiment (MACE) Program underway at Argonne National Laboratory under ACE/EPRI sponsorship. The program addresses the efficacy of water to terminate an accident situation if melt progression were to result in a molten core/concrete interaction (MCCI) in the reactor containment. Large-scale experiments are being conducted in parallel with related modeling efforts, involving the addition of water to an MCI already underway. The experiments utilize UO{sub 2}/ZrO{sub 2}/Zr corium mixtures, direct electrical heating for simulation of decay heating, and various types of concrete basemats. Currently the tests involve 430 kg corium mass, 25 cm depth, in a 50 cm square test section. Test MO was a successful scoping test, but the first full size test, Ml, failed to achieve melt-water contact owing to existence of a preexisting bridge crust of corium charge. A heat flux of 3.5 MW/m{sup 2} was measured in MO which removed energy from the corium pool equivalent to its entire heat of solidification prior to abatement by formation of an interfacial crust. The crust subsequently limited heat extraction to 600 kW/m{sup 2} and less. Both tests MO and Ml revealed physical evidence of large pool swelling events which resulted in extrusion (and ejection) of melt into water above the crust, significantly increasing the overall quench and reducing the remaining melt in contact with the concrete. Furthermore, test Ml provided evidence of occasional burst mode'' ablation events and one additional important benefit of overlying water -- aerosol capture.

Spencer, B.W.; Farmer, M.T.; Armstrong, D.R.; Kilsdonk, D.J.; Aeschlimann, R.W. (Argonne National Lab., IL (United States)); Fischer, M. (Siemens AG, Berlin (Germany))

1992-01-01

423

GPM Avionics Module Heat Pipes Design and Performance Test Results  

NASA Technical Reports Server (NTRS)

The Global Precipitation Measurement (GPM) mission is an international network of satellites that provide the next-generation global observations of rain and snow. The GPM core satellite carries an advanced radar / radiometer system to measure precipitation from space and serve as a reference standard to unify precipitation measurements from a constellation of research and operational satellites. Through improved measurements of precipitation globally, the GPM mission will help to advance our understanding of Earth's water and energy cycle, improve forecasting of extreme events that cause natural hazards and disasters, and extend current capabilities in using accurate and timely information of precipitation to directly benefit society. The avionics module on the core satellite contains a number of electronics boxes which are cooled by a network of aluminum/ammonia heat pipes and a honeycomb radiator which contains thirteen embedded aluminum/ammonia heat pipes. All heat pipes were individually tested by the vendor (Advanced Cooling Technologies, Inc.) prior to delivery. Following delivery to NASA, the flight avionics radiator and the flight spare transport heat pipes were mounted to flight-like test structure and a system level thermal vacuum test was performed. This test, which used simulators in place of all electronics boxes, was done to verify the operation of the thermal control system as a whole. This presentation will discuss the design of the avionics module heat pipes, and then discuss performance tests results for the individual heat pipes prior to delivery and for the system level thermal vacuum test. All heat pipes met their performance requirements. However, it was found that the power was too low in some instances to start all of the smaller radiator spreader heat pipes when they were tested in a reflux configuration (which is the nominal test configuration). Although this lowered the efficiency of the radiator somewhat, it did not impact the operating temperatures of the electronics boxes.

Ottenstein, Laura; DeChristopher, Mike

2011-01-01

424

Long Term Corrosion/Degradation Test Six Year Results  

SciTech Connect

The Subsurface Disposal Area (SDA) of the Radioactive Waste Management Complex (RWMC) located at the Idaho National Engineering and Environmental Laboratory (INEEL) contains neutron-activated metals from non-fuel, nuclear reactor core components. The Long-Term Corrosion/Degradation (LTCD) Test is designed to obtain site-specific corrosion rates to support efforts to more accurately estimate the transfer of activated elements to the environment. The test is using two proven, industry-standard methods—direct corrosion testing using metal coupons, and monitored corrosion testing using electrical/resistance probes—to determine corrosion rates for various metal alloys generally representing the metals of interest buried at the SDA, including Type 304L stainless steel, Type 316L stainless steel, Inconel 718, Beryllium S200F, Aluminum 6061, Zircaloy-4, low-carbon steel, and Ferralium 255. In the direct testing, metal coupons are retrieved for corrosion evaluation after having been buried in SDA backfill soil and exposed to natural SDA environmental conditions for times ranging from one year to as many as 32 years, depending on research needs and funding availability. In the monitored testing, electrical/resistance probes buried in SDA backfill soil will provide corrosion data for the duration of the test or until the probes fail. This report provides an update describing the current status of the test and documents results to date. Data from the one-year and three-year results are also included, for comparison and evaluation of trends. In the six-year results, most metals being tested showed extremely low measurable rates of general corrosion. For Type 304L stainless steel, Type 316L stainless steel, Inconel 718, and Ferralium 255, corrosion rates fell in the range of “no reportable” to 0.0002 mils per year (MPY). Corrosion rates for Zircaloy-4 ranged from no measurable corrosion to 0.0001 MPY. These rates are two orders of magnitude lower than those specified in the performance assessment for the SDA. The corrosion on the carbon steel, beryllium, and aluminum were more evident with a clear difference in corrosion performance between the 4-ft and 10-ft levels. Notable surface corrosion products were evident as well as numerous pit initiation sites. Since the corrosion of the beryllium and aluminum is characterized by pitting, the geometrical character of the corrosion becomes more significant than the general corrosion rate. Both pitting factor and weight loss data should be used together. For six-year exposure, the maximum carbon steel corrosion rate was 0.3643 MPY while the maximum beryllium corrosion rate was 0.3282 MPY and the maximum aluminum corrosion rate was 0.0030 MPY.

M. K. Adler Flitton; C. W. Bishop; M. E. Delwiche; T. S. Yoder

2004-09-01

425

Thermosyphon Flooding in Reduced Gravity Environments Test Results  

NASA Technical Reports Server (NTRS)

The condenser flooding phenomenon associated with gravity aided two-phase thermosyphons was studied using parabolic flights to obtain the desired reduced gravity environment (RGE). The experiment was designed and built to test a total of twelve titanium water thermosyphons in multiple gravity environments with the goal of developing a model that would accurately explain the correlation between gravitational forces and the maximum axial heat transfer limit associated with condenser flooding. Results from laboratory testing and parabolic flights are included in this report as part I of a two part series. The data analysis and correlations are included in a follow on paper.

Gibson, Marc A.; Jaworske, Donald A.; Sanzi, Jim; Ljubanovic, Damir

2013-01-01

426

Performance results of a digital test signal generator  

NASA Technical Reports Server (NTRS)

Performance results of a digital test signal-generator hardware-demonstration unit are reported. Capabilities available include baseband and intermediate frequency (IF) spectrum generation, for which test results are provided. Repeatability in the setting of a given signal-to-noise ratio (SNR) when a baseband or an IF spectrum is being generated ranges from 0.01 dB at high SNR's or high data rates to 0.3 dB at low data rates or low SNR's. Baseband symbol SNR and carrier SNR (Pc/No) accuracies of 0.1 dB were verified with the built-in statistics circuitry. At low SNR's that accuracy remains to be fully verified. These results were confirmed with measurements from a demodulator synchronizer assembly for the baseband spectrum generation, and with a digital receiver (Pioneer 10 receiver) for the IF spectrum generation.

Gutierrez-Luaces, B. O.; Marina, M.; Parham, B.

1993-01-01

427

Free-piston stirling component test power converter test results of the initial test phase  

NASA Astrophysics Data System (ADS)

The National Aeronautics and Space Administration (NASA)-Lewis Research Center (LeRC) has the responsibility to develop power technologies that have the potential of satisfying anticipated future space mission power requirements. The Free-Piston Stirling Power Converter (FPSC) is one of the many power technologies being evaluated and developed by NASA. FPSPCs have the potential to provide high reliability, long life, efficient operation; and they can be coupled with all potential heat sources, nuclear, radioisotope and solar, various heat input, heat rejection systems, and various power management and distribution systems. FPSPCs can complete favorably with alternative power conversion systems over a range of hundreds of watts to hundreds of kilowatts and to megawatts. Mechanical Technology Incorporated (MTI) is developed FPSPC technology under contract to NASA-LeRC and will demonstrate this technology in two full-scale power converters. The first of these, the Component Test Power Converter (CTPC), initiated testing in Spring 1991 to evaluate mechanical operation at space operating temperatures. This paper reviews the testing of the CTPC at MTI and the companion testing of the earlier technology engine, the Space Power Research Engine (SPRE) at NASA-LeRC.

Dochat, George R.; Dudenhoefer, James E.

1992-01-01

428

Experimental test results of a generalized parameter fuel control  

NASA Technical Reports Server (NTRS)

Considerable interest has been generated recently in low cost jet propulsion systems. One of the more complicated components of jet engines is the fuel control. Results of an effort to develop a simpler hydromechanical fuel control are presented. This prototype fuel control was installed on a J85-GE-13 jet engine. Results show that the fuel control provided satisfactory engine performance at sea level static conditions over its normal nonafterburning operating range, including startup. Results of both bench and engine tests are presented; the difficulties encountered are described.

Batterton, P. G.; Gold, H.

1973-01-01

429

Reliability test results of LGE pulse tube cryocooler  

NASA Astrophysics Data System (ADS)

A low-cost and highly reliable cryocooler is strongly required for several applications. In this circumstance, LG Electronics has developed a 5 W at 65 K pulse tube cryocooler with high potential for low-cost manufacturing based on linear motor and compressor technology. Recently dozens of coolers have been fabricated and tested for the verification of performance stability with ambient temperature variation. From tests at high ambient temperature like 60°C, an average performance degradation of 45% is found and good performance stability of coolers is shown. Continuous operation at 40°C is ongoing for the verification of their reliability. To date no failure has been found. This paper discusses the test process, results and MTBF calculation. .

Kim, S.-Y.; Chung, W.-S.; Park, J.-J.; Hwang, D.-K.; Lee, H.-K.

2002-05-01

430

TEST RESULTS FROM GAMMA IRRADIATION OF ALUMINUM OXYHYDROXIDES  

SciTech Connect

Hydrated metal oxides or oxyhydroxides boehmite and gibbsite that can form on spent aluminum-clad nuclear fuel assemblies during in-core and post-discharge wet storage were exposed as granular powders to gamma irradiation in a {sup 60}Co irradiator in closed laboratory test vessels with air and with argon as separate cover gases. The results show that boehmite readily evolves hydrogen with exposure up to a dose of 1.8 x 10{sup 8} rad, the maximum tested, in both a full-dried and moist condition of the powder, whereas only a very small measurable quantity of hydrogen was generated from the granular powder of gibbsite. Specific information on the test setup, sample characteristics, sample preparation, irradiation, and gas analysis are described.

Fisher, D.; Westbrook, M.; Sindelar, R.

2012-02-01

431

Planar pixel sensors for the ATLAS upgrade: beam tests results  

NASA Astrophysics Data System (ADS)

The performance of planar silicon pixel sensors, in development for the ATLAS Insertable B-Layer and High Luminosity LHC (HL-LHC) upgrades, has been examined in a series of beam tests at the CERN SPS facilities since 2009. Salient results are reported on the key parameters, including the spatial resolution, the charge collection and the charge sharing between adjacent cells, for different bulk materials and sensor geometries. Measurements are presented for n+-in-n pixel sensors irradiated with a range of fluences and for p-type silicon sensors with various layouts from different vendors. All tested sensors were connected via bump-bonding to the ATLAS Pixel read-out chip. The tests reveal that both n-type and p-type planar sensors are able to collect significant charge even after the lifetime fluence expected at the HL-LHC.

Weingarten, J.; Altenheiner, S.; Beimforde, M.; Benoit, M.; Bomben, M.; Calderini, G.; Gallrapp, C.; George, M.; Gibson, S.; Grinstein, S.; Janoska, Z.; Jentzsch, J.; Jinnouchi, O.; Kishida, T.; La Rosa, A.; Libov, V.; Macchiolo, A.; Marchiori, G.; Muenstermann, D.; Nagai, R.; Piacquadio, G.; Ristic, B.; Rubinskiy, I.; Rummler, A.; Takubo, Y.; Troska, G.; Tsiskaridtze, S.; Tsurin, I.; Unno, Y.; Weigell, P.; Wittig, T.

2012-10-01

432

TEST RESULTS FOR LHC INSERTION REGION DEPOLE MAGNETS.  

SciTech Connect

The Superconducting Magnet Division at Brookhaven National Laboratory (BNL) has made 20 insertion region dipoles for the Large Hadron Collider (LHC) at CERN. These 9.45 m-long, 8 cm aperture magnets have the same coil design as the arc dipoles now operating in the Relativistic Heavy Ion Collider (RHIC) at BNL and are of single aperture, twin aperture, and double cold mass configurations. They are required to produce fields up to 4.14 T for operation at 7.56 TeV. Eighteen of these magnets have been tested at 4.5 K using either forced flow supercritical helium or liquid helium. The testing was especially important for the twin aperture models, whose construction was very different from the RHIC dipoles, except for the coil design. This paper reports on the results of these tests, including spontaneous quench performance, verification of quench protection heater operation, and magnetic field quality.

MURATORE, J.; JAIN, A.; ANERELLA, M.; COSSOLINO, J.; ET AL.

2005-05-16

433

Cycom 977-2 Composite Material: Impact Test Results  

NASA Technical Reports Server (NTRS)

The reaction frequency data from 13A testing by MSFC and WSTF appear well behaved for the sample number used by each and exhibit the same type of energy level dependency. The reaction frequency shift in energy level is unexplained at this time. All the 13A data suggest that only a small amount of material is consumed when reactions take place. At ambient pressure, most of not all reactions are quenched as indicated by the small mass loss. As test pressure is increased in LOX using 13B results. Cycom does not support initiation of reactions or propagations of reactions in GOX at 100 psis based on tests at MSFC and WSTF at 72 ft-lb impact energy. No batch effect was identified in LOX or GOX.

Engel, Carl D.; Herald, Stephen; Watkins, Casey

2005-01-01

434

SP-100 fuel pin performance: Results from irradiation testing  

SciTech Connect

A total of 86 experimental fuel pins with various fuel, liner, and cladding candidate materials have been irradiated in the Experimental Breeder Reactor-II (EBR-II) and the Fast Flux Test Facility (FFTF) reactor as part of the SP-100 fuel pin irradiation testing program. Postirradiation examination results from these fuel pin are key in establishing performance correlations and demonstrating the lifetime and safety of the reactor fuel system. This paper provides a brief description of the in-reactor fuel pin tests and presents the most recent irradiation data on the performance of wrought rhenium (Re) liner material and high density UN fuel at goal burnup of 6 atom percent (at. %). It also provides an overview of the significant variety of other fuel/liner/cladding combinations which were irradiated as part of this program and which may be of interest to more advanced efforts.

Makenas, B.J.; Paxton, D.M. [Westinghouse Hanford Co., Richland, WA (United States); Vaidyanathan, S. [Martin Marietta, San Jose, CA (United States); Hoth, C.W. [Los Alamos National Lab., NM (United States)

1993-09-01

435

Effect of magnetic water on the engineering properties of concrete containing granulated blast-furnace slag  

Microsoft Academic Search

This research investigates the compressive strength and workability of mortar and concrete, which were mixed with magnetic water and contained granulated blast-furnace slag (GBFS). The test variables included the magnetic strength of water, the content of GBFS in place of cement, and the water-to-binder ratio (W\\/B). Results show that the compressive strength of mortar samples mixed with magnetic water of

Nan Su; Yeong-Hwa Wu; Chung-Yo Mar

2000-01-01

436

Localised blast loading of fibre–metal laminates with a polyamide matrix  

Microsoft Academic Search

This paper presents the results of localised blast tests on fully clamped square fibre–metal laminate panels, manufactured using sheets of 2024-O aluminium alloy, woven glass–fibre reinforced polyamide and a polypropylene adhesive. The fracture properties of the composite–metal interface were determined using the single cantilever beam geometry and the measured interfacial fracture toughness was between values in the literature for thermosetting

G. S. Langdon; W. J. Cantwell; G. N. Nurick

2007-01-01

437

Flight test results of the Strapdown hexad Inertial Reference Unit (SIRU). Volume 1: Flight test summary  

NASA Technical Reports Server (NTRS)

Flight test results of the strapdown inertial reference unit (SIRU) navigation system are presented. The fault-tolerant SIRU navigation system features a redundant inertial sensor unit and dual computers. System software provides for detection and isolation of inertial sensor failures and continued operation in the event of failures. Flight test results include assessments of the system's navigational performance and fault tolerance.

Hruby, R. J.; Bjorkman, W. S.

1977-01-01

438

Characterization of explosive devices in luggage: Initial results of the ART-IIC test series  

SciTech Connect

Characteristics and damage associated with exploded luggage aboard aircraft are presented in this paper. Plastic-sided suitcases filled with typical travel possessions were exploded inside the fuselage of decomissioned B-52 aircraft. Multilayered shield panels, mounted to one side of the fuselage, served to protect the aircraft body and flight system components from both the blast wave and exploded fragments. The resulting damage produced by the explosions was characterized and the absorbing characteristics of the shielding were evaluated. In addition, the energy of the luggage fragments was estimated.

Akerman, M.A.; Kass, M.D. [Oak Ridge National Lab., TN (United States); Clough, B.T. [Wright Lab., Wright-Patterson AFB, OH (United States)

1993-12-31

439

Small-Scale Spray Releases: Orifice Plugging Test Results  

SciTech Connect

One of the events postulated in the hazard analysis at the Waste Treatment and Immobilization Plant (WTP) and other U.S. Department of Energy (DOE) nuclear facilities, is a breach in process piping that produces aerosols with droplet sizes in the respirable range. The current approach for predicting the size and concentration of aerosols produced in a spray leak involves extrapolating from correlations published in the literature. These correlations are based on results obtained from small engineered spray nozzles using pure liquids with Newtonian fluid behavior. The narrow ranges of physical properties on which the correlations are based do not cover the wide range of slurries and viscous materials present in the WTP and across processing facilities in the DOE complex. Two key technical areas were identified where testing results were needed to improve the technical basis by reducing the uncertainty introduced by extrapolating existing literature results. The first technical need was to quantify the role of slurry particles in small breaches in which the slurry particles may plug and result in substantially reduced, or even negligible, respirable fraction formed by high pressure sprays. The second technical need was to determine the aerosol droplet size distribution and volume from prototypic breaches and fluids, specifically including sprays from larger breaches with slurries where data from the literature are largely absent. To address these technical areas, small- and large-scale test stands were constructed and operated with simulants to determine the aerosol release fractions and aerosol generation rates from a range of breach sizes and geometries. The properties of the simulants represented the range of properties expected in the WTP process streams and included water, sodium salt solutions, slurries containing boehmite or gibbsite, and a hazardous chemical simulant. The effect of anti-foam agents (AFA) was assessed with most of the simulants. Orifices included round holes and rectangular slots. Much of the testing was conducted at pressures of 200 and 380 psi, but some tests were conducted at 100 psi. Testing the largest postulated breaches was deemed impractical because of the large size of some of the WTP equipment. The purpose of the study described in this report is to provide experimental data for the first key technical area, potential plugging of small breaches, by performing small-scale tests with a range of orifice sizes and orientations representative of the WTP conditions. The simulants used were chosen to represent the range of process stream properties in the WTP. Testing conducted after the plugging tests in the small- and large-scale test stands addresses the second key technical area, aerosol generation. The results of the small-scale aerosol generation tests are included in Mahoney et al. 2012. The area of spray generation from large breaches is covered by large-scale testing in Schonewill et al. 2012.

Mahoney, Lenna A.; Gauglitz, Phillip A.; Blanchard, Jeremy; Kimura, Marcia L.; Kurath, Dean E.

2012-09-01

440

DUS II SOIL GAS SAMPLING AND AIR INJECTION TEST RESULTS  

SciTech Connect

Soil vapor extraction (SVE) and air injection well testing was performed at the Dynamic Underground Stripping (DUS) site located near the M-Area Settling Basin (referred to as DUS II in this report). The objective of this testing was to determine the effectiveness of continued operation of these systems. Steam injection ended on September 19, 2009 and since this time the extraction operations have utilized residual heat that is present in the subsurface. The well testing campaign began on June 5, 2012 and was completed on June 25, 2012. Thirty-two (32) SVE wells were purged for 24 hours or longer using the active soil vapor extraction (ASVE) system at the DUS II site. During each test five or more soil gas samples were collected from each well and analyzed for target volatile organic compounds (VOCs). The DUS II site is divided into four parcels (see Figure 1) and soil gas sample results show the majority of residual VOC contamination remains in Parcel 1 with lesser amounts in the other three parcels. Several VOCs, including tetrachloroethylene (PCE) and trichloroethylene (TCE), were detected. PCE was the major VOC with lesser amounts of TCE. Most soil gas concentrations of PCE ranged from 0 to 60 ppmv with one well (VEW-22A) as high as 200 ppmv. Air sparging (AS) generally involves the injection of air into the aquifer through either vertical or horizontal wells. AS is coupled with SVE systems when contaminant recovery is necessary. While traditional air sparging (AS) is not a primary component of the DUS process, following the cessation of steam injection, eight (8) of the sixty-three (63) steam injection wells were used to inject air. These wells were previously used for hydrous pyrolysis oxidation (HPO) as part of the DUS process. Air sparging is different from the HPO operations in that the air was injected at a higher rate (20 to 50 scfm) versus HPO (1 to 2 scfm). . At the DUS II site the air injection wells were tested to determine if air sparging affected VOC soil gas concentrations during ASVE. Five (5) SVE wells that were located closest to the air injection wells were used as monitoring points during the air sparging tests. The air sparging tests lasted 48 hours. Soil gas sample results indicate that sparging did not affect VOC concentrations in four of the five sparging wells, while results from one test did show an increase in soil gas concentrations.

Noonkester, J.; Jackson, D.; Jones, W.; Hyde, W.; Kohn, J.; Walker, R.

2012-09-20

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