9
9.0
Oct 28, 2021
10/21
by
Bull, Simon, 1949-
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80 pages : 20 cm
Topics: Clocks and watches, Time measuring equipment
7
7.0
Aug 4, 2021
08/21
by
McConnell, Anita
texts
eye 7
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32 pages : 21 cm
Topics: Barometers -- Great Britain, Barometers, Great Britain, Measuring equipment
6
6.0
Oct 27, 2021
10/21
by
Graham, J. T. (John Thomas), 1913-
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32 pages
Topics: Weighing instruments -- History, Weighing instruments, Weight Measuring equipment
Infiltration measuring equipment on the Fairchild F-24-W40 airplane..Fairchild F-24-W40 airplane used for infiltration test.
Topic: Infiltration measuring equipment on the Fairchild F-24-w40 airplane.
Journal of Research of the National Institute of Standards and Technology
Topics: calibration, radon chamber, radon and daughters measuring equipment, radon reference atmospheres
16
16
Jan 15, 2022
01/22
by
Jones, Larry D., 1936-
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xx, 580 pages : 24 cm
Topics: Electronic instruments, Electronic measurements, Appareils électroniques, Mesures...
100
100
Dec 28, 2015
12/15
by
IASET JOURNALS
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A new meal supporting system for disabled people who cannot eat foods by themselves has developed in this laboratory. It was succeeded to create prototype of the meal supporting system which has four concepts: “safe”, “reliable”, “comfortable” and “a sense to eat foods by oneself”. However, the prototype was not good at spooning up foods. It is necessary to derive the suitable speed and torque of rotation of spoon. In order to determine the rotational motion of spoon, the...
Topics: Load Measuring Equipment, Meal Supporting Equipment, Mechanical Properties of Foods, Welfare...
33
33
Jan 6, 2012
01/12
by
Connes, Keith, 1926-
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Bibliography: p. [96]-97
Topics: Airplanes, Aids to air navigation, Loran, Distance measuring equipment (Aircraft to ground station)
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34
Dec 26, 2020
12/20
by
Curtis, Tony, 1939-
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eye 34
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447 pages : 26 cm
Topics: Clocks and watches -- Prices, Clocks and watches -- Collectors and collecting, Time measuring...
304
304
Jul 26, 2010
07/10
by
Lang, Kenneth R
texts
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The radio emission from dMe flare stars is discussed using Very Large Array and Arecibo observations as examples. Active flare stars emit weak, unpolarized, quiescent radio radiation that may be always present. Although thermal bremsstrahlung and/or thermal gyroresonance radiation account for the slowly-varying, quiescent radio radiation of solar active regions, these processes cannot account for the long-wavelength quiescent radiation observed from nearby dMe flare stars. It has been...
Topics: APERTURES, CONTINUOUS RADIATION, DIELECTRICS, DISTANCE, RANGEFINDING, REFLECTANCE, DISTANCE...
6
6.0
May 24, 2021
05/21
by
Connes, Keith, 1926-
texts
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124 p. : 23 cm
Topics: Airplanes -- Radio equipment, Aids to air navigation, Loran, Distance measuring equipment (Aircraft...
A quick adjust depth gage includes a handle-clamp assembly wherein the clamp includes an opening in which a cylindrical shaft with suitable depth measurement markings thereon is reviewed. Turning the handle on the clamp enables the gage to be set to the desired depth.
Topics: NASA Technical Reports Server (NTRS), DEPTH MEASUREMENT, DISTANCE MEASURING EQUIPMENT, DRILLING,...
The ambiguity-resolution problem for a Distance Measuring Equipment (DME), using four independent modulation frequencies in the 500-kc region, is described in mathematical terms. The method is developed for a DME model with decimal modula tion frequency relationships and then applied to the actual system whose modulation frequencies are related by binary numbers. Finally, two digital-computer routines providing for both ambiguity resolution and accuracy increase by averaging over the four phase...
Topics: DTIC Archive, Holberg, Dieter E, WHITE SANDS MISSILE RANGE NM, *DATA REDUCTION, *DISTANCE MEASURING...
Van is used by Land Inventory Systems to measure and map property for tax assessment purposes. It is adapted from navigation system of the Lunar Rover wheeled vehicle in which moon-exploring astronauts traveled as much as 20 miles from their Lunar Module base. Astronauts had to know their precise position so that in case of emergency they could take the shortest route back. Computerized navigational system kept a highly accurate record of the directional path providing continuous position...
Topics: NASA Technical Reports Server (NTRS), DISTANCE MEASURING EQUIPMENT, LUNAR MODULE, COUNTING,...
Electronic system can rapidly determine location of lightning strikes occurring within 30 km range. Longer distances are also determined, but with reduced accuracy. Studies have shown that lightning bolt emits electromagnetic wavefront; distance to lightning is determined from ratio of magnetic to electric field.
Topics: NASA Technical Reports Server (NTRS), DISTANCE MEASURING EQUIPMENT, ELECTRIC FIELDS, ELECTRONIC...
The Clogeos (Close-Grid Geodynamic Measurement System) concept, a complete range or range-rate measurement terminal installed in a satellite in a near-polar orbit with a network of relatively simple transponders or retro-reflectors on the ground at intervals of 0.1 to 10 km was reviewed. The distortion of the grid was measured in three dimensions to accuracies of + or - 1 cm with important applications to geodynamics, glaciology, and geodesy. User requirements are considered, and a typical...
Topics: NASA Technical Reports Server (NTRS), DISTANCE MEASURING EQUIPMENT, EARTHQUAKES, SAN ANDREAS FAULT,...
The MATS transponder utilizes a crystal-controlled double-conversion phase locked (correlation) receiver with a subcarrier phase-following loop around the complete transponder, for the purpose of phase stability and the realization of the required transponder sensitivity. Thus high sensitivity is realized in the presence of high modulation index subcarriers. Coherent AGC is employed in the receiver. The transmitter is crystal-controlled and phase- modulated, and employs transistors as active...
Topics: DTIC Archive, Gantsweg, M, ITT FEDERAL LABS SAN FERNANDO CA, *GEODESICS, *TRANSPONDERS, DISTANCE...
Topics: DTIC Archive, Carlton-Wippern, K., SPACE COMMAND PETERSON AFB CO, *GEODESY, *SURFACE NAVIGATION,...
The FAA is conducting operational demonstrations of several TRSB hardware configurations at selected airports in the United States and abroad. The first demonstration was at Cape May, NJ, using the Small Community System. The second demonstration was at Jorge Newbery Aeroparque in Buenos Aires, Argentina, using the Basic Narrow TRSB collocated with UHF/VHF ILS. This system was designed for azimuth proportional guidance +40 degrees about the runway centerline, elevation proportional guidance...
Topics: DTIC Archive, NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J, *MICROWAVE...
Two eddy current proximity probe systems were tested over a range of 0 to 508 micrometers (0 to 20 mils) of simulated potassium film thicknesses for simulated temperatures of 66 C (150 F), 232 C (450 F), and 666 C (1230 F). The results of short time calibration tests are presented. Instrument drift was a problem throughout the testing and, without correction, may limit the use of such systems to short periods of time. Additional development will be required prior to their being usable as...
Topics: NASA Technical Reports Server (NTRS), DRIFT (INSTRUMENTATION), EDDY CURRENTS, INSTRUMENT...
A modified Michelson interferometer was built and its performance evaluated for the measurement of very small displacements. The instrument was assembled from components already available in the laboratory and suggestions are made for an improved version.
Topics: DTIC Archive, Brousseau,N, DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO), *MICHELSON...
Apparatus is described for determining the distance to lightning strokes from a single station. The apparatus includes a first loop antenna system for sensing the magnetic field produced by the lightning which is filtered, square rooted, and fed into a peak voltage holding circuit. A second antenna is provided for sensing the electric field produced by the lightning which is fed into a filter, an absolute value meter, and to a peak voltage holding circuit. A multivibrator gates the magnetic and...
Topics: NASA Technical Reports Server (NTRS), DISTANCE MEASURING EQUIPMENT, ELECTRIC FIELDS, LIGHTNING,...
This software performs two functions: (1) taking stereo image pairs as input, it computes stereo disparity maps from them by cross-correlation to achieve 3D (three-dimensional) perception; (2) taking a sequence of stereo image pairs as input, it tracks features in the image sequence to estimate the motion of the cameras between successive image pairs. A real-time stereo vision system with IMU (inertial measurement unit)-assisted visual odometry was implemented on a single 750 MHz/520 MHz...
Topics: NASA Technical Reports Server (NTRS), ROBOTS, STEREOSCOPIC VISION, DISTANCE MEASURING EQUIPMENT,...
This test plan outlines the Test and Evaluation (T&E) process, and details the field T&E needed to support the Precision Distance Measuring Equipment (DME/P) interrogator procurement. DME/P Interrogator Test Plan, DME/P Interrogator Requirements, Flight test procedures.
Topics: DTIC Archive, Warburton, John, FEDERAL AVIATION ADMINISTRATION TECHNICAL CENTER ATLANTIC CITY NJ,...
The principal objective of this study was an evaluation of the formulas basic to the geodetic inverse solution for distance computations used by the U. S. Naval Oceanographic Office in loran-type charting. The adequacy of the formulas for past requirements was verified but, in anticipation of future requirements, they were modified to give geodesic distances and azimuths between any two points on the reference ellipsoid to uncertainties of less than a meter and a second respectively. During the...
Topics: DTIC Archive, NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS, *LORAN, *GEODESICS, DISTANCE MEASURING...
362
362
May 12, 2010
05/10
by
Doebelin, Ernest O
texts
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Includes bibliographies and index
Topics: Measuring instruments, Physical measurements, Instrumentos de medición, Meetinstrumenten,...
The test procedure describes test methods and techniques for evaluating the performance and characteristics of the ground station portion of Geodetic Survey Systems (Radio Ranging), and for determining the suitability of such equipment for service use in the U. S. Army.
Topics: DTIC Archive, ARMY TEST AND EVALUATION COMMAND ABERDEEN PROVING GROUND MD, *DISTANCE MEASURING...
The MAT transponder utilizes a crystal-controlled double-conversion phase locked (correlation) receiver with a subcarrier phase-following loop around the complete transponder, for the purpose of phase stability and the realization of the required transponder sensitivity. Thus high sensitivity is realized in the presence of high modulation index subcarriers. Coherent AGC is employed in the receiver. The transmitter is crystal-controlled and phase- modulated, and employs transistors as active...
Topics: DTIC Archive, Gantsweg, M, ITT AEROSPACE/OPTICAL DIV SAN FERNANDO CA AEROSPACE LABS, *GEODESICS,...
The present invention is an improved distance measuring interferometer that includes high speed phase modulators and additional phase meters to generate and analyze multiple heterodyne signal pairs with distinct frequencies. Modulation sidebands with large frequency separation are generated by the high speed electro-optic phase modulators, requiring only a single frequency stable laser source and eliminating the need for a fist laser to be tuned or stabilized relative to a second laser. The...
Topics: NASA Technical Reports Server (NTRS), DISTANCE MEASURING EQUIPMENT, ELECTRO-OPTICS, LASERS,...
A device used in the optical alignment of machinery to maintain a measuring scale in the proper position for optical readings to be taken is described. The device consists of a block containing a notch in the shape of an inverted ""v'' and a rotatable plug positioned over the centerline of notch. The block is placed on the object to be aligned, the notch allows the block to be securely placed upon flat or curved surfaces. A weighted measuring scale is inserted through plug so that it...
Topics: NASA Technical Reports Server (NTRS), ALIGNMENT, DISTANCE MEASURING EQUIPMENT, OPTICAL MEASUREMENT,...
The reliable detection of an object of interest in an input image with arbitrary background clutter and occlusion has to a large extent remained an elusive goal in computer vision. Traditional model-based approaches are inappropriate for a multi-class object detection task primarily due to difficulties in modeling arbitrary object classes. Instead, we develop a detection framework whose core component is a nearest neighbor search over object parts. The performance of the overall system is...
Topics: DTIC Archive, Mahamud, Shyjan, CARNEGIE-MELLON UNIV PITTSBURGH PA SCHOOL OF COMPUTER SCIENCE,...
212
212
Jun 21, 2010
06/10
by
Suga, K.; Watanabe, S
texts
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Oligomerization of isoprene with low degree of polymerization
Topics: ATTITUDE (INCLINATION), SATURN S-2 STAGE, SATURN S-4B STAGE, STAGE SEPARATION, DIMENSIONAL...
A series of engineering tests designed to determine the technical performance of distance measuring systems and equipment is outlined in this test operation procedure (TOP). The only type of DME system treated in this TOP is the VOR/TACAN/DME. The following tests collectively constitute an engineering evaluation of DME to determine: (1) Range and Accuracy - The average inbound lock-on and outboard unlock range limits and frequency distribution of errors within the range limits; (2) Warmup - The...
Topics: DTIC Archive, ARMY TEST AND EVALUATION COMMAND ABERDEEN PROVING GROUND MD, *TEST AND EVALUATION,...
Volume II covers multipath, shadowing and terrain; propagation and polarization; DME verification, identification and resolution of remaining technical problems, system trades; system compatibility; system performance summary; and signal format summary.
Topics: DTIC Archive, HAZELTINE CORP GREENLAWN NY, *LANDING AIDS, PROPAGATION, POLARIZATION, SYSTEMS...
This report develops revised establishment criteria for Distance Measuring Equipment (DME) with either Instrument Landing System (ILS) or localizer approach aids. The criteria are based upon analysis of DME payoffs versus the cost of providing and maintaining the equipment. This benefit/cost analysis considers the following factors: Use of DME in lieu of ILS outer marker beacon; Reduced probability of approach accidents; Averted flight disruptions due to reduced localizer minima; Averted missed...
Topics: DTIC Archive, Solomon,H L, SYSTEMS CONTROL INC PALO ALTO CALIF, *INSTRUMENT LANDINGS, *DISTANCE...
This report presents an analytic and experimental investigation of the measurement problem in which a reflectometer is used to determine the distance to a target that is a highly conductive surface parallel to the reflectometer antenna ground plane. These parallel surfaces constitute a waveguide (WG) which can contribute parasitic perturbations that seriously degrade the accuracy of the measurements. Two distinct parallel-plate-waveguide (PPWG) phenomena are described, and their effects on both...
Topics: NASA Technical Reports Server (NTRS), DISTANCE MEASURING EQUIPMENT, MICROWAVE REFLECTOMETERS,...
The utilization of minimum distance classification methods in remote sensing problems, such as crop species identification, is considered. Literature concerning both minimum distance classification problems and distance measures is reviewed. Experimental results are presented for several examples. The objective of these examples is to: (a) compare the sample classification accuracy of a minimum distance classifier, with the vector classification accuracy of a maximum likelihood classifier, and...
Topics: NASA Technical Reports Server (NTRS), CLASSIFIERS, CROP IDENTIFICATION, DATA SAMPLING, PERFORMANCE,...
285
285
May 31, 2011
05/11
by
Frumkin, Michael A.; Schultz, Matthew; Jin, Haoqiang; Yan, Jerr
texts
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Several features make Java an attractive choice for High Performance Computing (HPC). In order to gauge the applicability of Java to Computational Fluid Dynamics (CFD), we have implemented the NAS (NASA Advanced Supercomputing) Parallel Benchmarks in Java. The performance and scalability of the benchmarks point out the areas where improvement in Java compiler technology and in Java thread implementation would position Java closer to Fortran in the competition for CFD applications.
Topics: ASTROMETRY, DISTANCE MEASURING EQUIPMENT, LYRA CONSTELLATION, ANGULAR RESOLUTION, ASTRONOMICAL...
358
358
Jul 26, 2010
07/10
by
Knox, Charles E
texts
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A primary flight display format was integrated with the flight guidance and control system logic in support of various flight tests conducted with the NASA Transport Systems Research Vehicle B-737-100 airplane. The functional operation of the flight guidance mode control panel and the corresponding primary flight display formats are presented.
Topics: ADAPTERS, BIAS, DISTANCE MEASURING EQUIPMENT, GASKETS, PRESSURE SENSORS, THERMOCOUPLES, BOLTED...
The report covers the results of laboratory and field tests of various TACAN ground station modifications designed to minimize the false DME problem. An airborne and ground data collection package was designed to record the percentage of false replies synchronous with an aircraft interrogation. The modifications tested included a modified GRN-9 TACAN receiver, a tighter decoder tolerance modification (Tulsa modification), a jittering dead time gate, and a retriggerable long dead time gate...
Topics: DTIC Archive, Hartranft, George, NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY NJ,...
The report provides a current program description of, and shows the capabilities indicated by, the recursive navigation simulation. Two sets of simulation data are examined in some detail; one resembling the PLRACTA demonstration testbed and one characteristic of a large tactical area with many aircraft. It will be shown that performance can be predicted with some confidence for certain specific situations.
Topics: DTIC Archive, Snodgrass, Robert C, MITRE CORP BEDFORD MA, *NAVIGATION COMPUTERS, ALGORITHMS,...
The objective of the procedure is to evaluate the performance and safety characteristics of laser rangefinders under a variety of expected operating conditons.
Topics: DTIC Archive, ARMY TEST AND EVALUATION COMMAND ABERDEEN PROVING GROUND MD, *TEST METHODS, *RANGE...
196
196
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Hewlett-Packard Journal Vol. 2 No. 6 (1951-02)(Hewlett-Packard)
Topics: slotted, waveguide, probe, model, carriage, detector, sections, untuned, palo, probes, slotted...
Precise geodetic measurements are proposed in which an orbiting laser obtains intersite distance between retroreflectors 25 to 100 km apart on the ground. The recommended area is a rectangle 200 by 400 km in southern California and adjacent Nevada, trending northeast. It includes the entire width of the San Andreas fault zone, the Garlock fault, the thrust faults of the Transverse Ranges, and the active strike-slip faults of the Mojave Desert.
Topics: NASA Technical Reports Server (NTRS), GEODETIC SURVEYS, LASER APPLICATIONS, SAN ANDREAS FAULT,...
To begin a study of structure effects, this report presents a theoretical framework, proposes an effective position approach to structure corrections based on brightness distribution measurements, and analyzes examples of analytical and measured brightness distributions. Other topics include the effect of the frequency dependence of a brightness distribution on bandwidth synthesis (BWS) delay, the determination of the absolute location of a measured brightness distribution, and structure...
Topics: NASA Technical Reports Server (NTRS), BRIGHTNESS, ERROR ANALYSIS, GEODESY, GEOPHYSICS,...
The absolute bias calibration for the GEOS-3 intensive mode altimeter was measured using two satellite passes whose groundtracks were within 1 km of the Bermuda laser station. The Bermuda laser tracked on the two passes, and was supported by two other NASA lasers on one pass and by the NASA Spacecraft Tracking and Data Network on the other pass. For each pass, the altimeter data around Bermuda was smoothed and extrapolated to the point closest to overhead at the laser site. After correcting for...
Topics: NASA Technical Reports Server (NTRS), CALIBRATING, DISTANCE MEASURING EQUIPMENT, GEOS 3 SATELLITE,...
The purpose of this study is to identify the capabilities and limitations of a particular set of navigation systems and evaluate their performance in the current airspace environment. The navigation systems evaluated are Loran-C, Omega, VHF Omnidirectional Range/Distance Measuring Equipment (VOR/DME), Global Positioning System (GPS), Doppler navigation system, and inertial navigation system (INS). In addition to detailed technical and operational analyses of each navigation system,...
Topics: DTIC Archive, Hogle, L., ARINC RESEARCH CORP ANNAPOLIS MD, *GLOBAL POSITIONING SYSTEM, *INERTIAL...
An automated channel assignment model was constructed in response to an FAA need to assess the assignment feasibility of planned MLS angle-guidance equipment in C-band, and its associate L-band Precision Distance Measurement Equipment (PDME). The intersite interference analysis and channel-assignment algorithm capabilities are described. A trial assignment of MLS equipments was performed for a Southwest United States airport environment and the results are summarized. (Author)
Topics: DTIC Archive, Hensler,Thomas, IIT RESEARCH INST ANNAPOLIS MD, *MICROWAVE LANDING SYSTEMS, *DISTANCE...
The use of lunar photography to obtain geodetic connections on the earth's surface has great advantages over the occultation and solar eclipse methods. The success of this method depends upon the accuracy with which a point on the moon's surface can be measured relative to the background of stars. The observational problem is a difficult one, but experiments now being carried out at the U. S. Naval Observatory should indicate whether the method of lunar photography is feasible for geodetic...
Topics: DTIC Archive, Slettebak,Arne E, OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS MAPPING AND CHARTING...
The variables which significantly affect accuracy in two position location and reporting systems are examined in this thesis. Some physical and mathematical characteristics of the two systems are described. A model is developed to evaluate system accuracy. The significant variables are identified using the techniques of Analysis of Variance and Stepwise Linear Regression on test data from the two systems.
Topics: DTIC Archive, Sevon, Jr, Walter W, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *POSITION FINDING,...
