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


1

Active Control Strategies for Chemical Sensors and Sensor Arrays  

E-Print Network [OSTI]

validated on metal-oxide (MOX) sensors. Our results show that the active sensing method obtains better classification performance than passive sensing methods, and also is more robust to additive Gaussian noise in sensor measurements. Second, we consider...

Gosangi, Rakesh

2013-07-17T23:59:59.000Z

2

Photo-activated luminescence sensor and method of detecting trichloroethylene and related volatile organochloride compounds  

DOE Patents [OSTI]

A sensor for detecting trichloroethylene and related volatile organochloride compounds uses a photo-activator that produces a photo-product complex with the contaminant. Characteristics of the light emitted from the complex will indicate the presence of the contaminant. A probe containing the photo-activator has an excitation light interface and a contaminant interface. One particular embodiment uses a porous membrane as the contaminant interface, so that the contaminant can migrate therethrough to the photo-activator and thereby form the complex.

Dinh, Tuan V. (Knoxville, TN)

1996-01-01T23:59:59.000Z

3

Photo-activated luminescence sensor and method of detecting trichloroethylene and related volatile organochloride compounds  

DOE Patents [OSTI]

A sensor for detecting trichloroethylene and related volatile organochloride compounds uses a photo-activator that produces a photo-product complex with the contaminant. Characteristics of the light emitted from the complex will indicate the presence of the contaminant. A probe containing the photo-activator has an excitation light interface and a contaminant interface. One particular embodiment uses a porous membrane as the contaminant interface, so that the contaminant can migrate there through to the photo-activator and thereby form the complex. 23 figs.

Dinh, T.V.

1996-06-11T23:59:59.000Z

4

Active Sensors | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Active Sensors Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Active Sensors Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Remote Sensing Techniques Exploration Sub Group: Active Sensors Parent Exploration Technique: Remote Sensing Techniques Information Provided by Technique Lithology: Stratigraphic/Structural: Detect fault and ground movement, delineate faults, create high-resolution DEMS, quantify fault kinemaics, develop lineament maps, Geophysical Monitoring Hydrological: Can give indications about subsurface geothermal fluid flow Thermal: Dictionary.png Active Sensors: Sensors that emit their own source of energy then measure the

5

Activity recognition with hand-worn magnetic sensors  

Science Journals Connector (OSTI)

Activity recognition is a key technology for realizing ambient assisted living applications such as care of the elderly and home automation. This paper proposes a new activity recognition method that employs hand-worn magnetic sensors to recognize a ... Keywords: Activity recognition, Ambient assisted living, Magnetic sensor, Wearable sensors

Takuya Maekawa; Yasue Kishino; Yasushi Sakurai; Takayuki Suyama

2013-08-01T23:59:59.000Z

6

Pneumatic gap sensor and method  

DOE Patents [OSTI]

An apparatus and method for monitoring and maintaining a predetermined width in the gap between a casting nozzle and a casting wheel, wherein the gap is monitored by means of at least one pneumatic gap sensor. The pneumatic gap sensor is mounted on the casting nozzle in proximity to the casting surface and is connected by means of a tube to a regulator and a transducer. The regulator provides a flow of gas through a restictor to the pneumatic gap sensor, and the transducer translates the changes in the gas pressure caused by the proximity of the casting wheel to the pneumatic gap sensor outlet into a signal intelligible to a control device. The relative positions of the casting nozzle and casting wheel can thereby be selectively adjusted to continually maintain a predetermined distance between their adjacent surfaces. The apparatus and method enables accurate monitoring of the actual casting gap in a simple and reliable manner resistant to the extreme temperatures and otherwise hostile casting environment.

Bagdal, Karl T. (Middletown, OH); King, Edward L. (Trenton, OH); Follstaedt, Donald W. (Middletown, OH)

1992-01-01T23:59:59.000Z

7

Multiple frequency method for operating electrochemical sensors  

DOE Patents [OSTI]

A multiple frequency method for the operation of a sensor to measure a parameter of interest using calibration information including the steps of exciting the sensor at a first frequency providing a first sensor response, exciting the sensor at a second frequency providing a second sensor response, using the second sensor response at the second frequency and the calibration information to produce a calculated concentration of the interfering parameters, using the first sensor response at the first frequency, the calculated concentration of the interfering parameters, and the calibration information to measure the parameter of interest.

Martin, Louis P. (San Ramon, CA)

2012-05-15T23:59:59.000Z

8

Category:Active Sensors | Open Energy Information  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Category Edit History Facebook icon Twitter icon » Category:Active Sensors Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Geothermalpower.jpg Looking for the Active Sensors page? For detailed information on exploration techniques, click here. Category:Active Sensors Add.png Add a new Active Sensors Technique Subcategories This category has only the following subcategory. R [×] Radar‎ 5 pages Pages in category "Active Sensors" The following 2 pages are in this category, out of 2 total. L LiDAR R Radar Retrieved from "http://en.openei.org/w/index.php?title=Category:Active_Sensors&oldid=689848"

9

Hydrogen gas sensor and method of manufacture  

DOE Patents [OSTI]

A sensor for measuring the pressure of hydrogen gas in a nuclear reactor, and method of manufacturing the same. The sensor comprises an elongated tube of hydrogen permeable material which is connected to a pressure transducer through a feedthrough tube which passes through a wall at the boundary of the region in which hydrogen is present. The tube is pressurized and flushed with hydrogen gas at an elevated temperature during the manufacture of the sensor in order to remove all gasses other than hydrogen from the device.

McKee, John M. (Hinsdale, IL)

1991-01-01T23:59:59.000Z

10

Carbon monoxide sensor and method of use thereof  

DOE Patents [OSTI]

Carbon monoxide sensors suitable for use in hydrogen feed streams and methods of use thereof are disclosed. The sensors are palladium metal/insulator/semiconductor (Pd-MIS) sensors which may possess a gate metal layer having uniform, Type 1, or non-uniform, Type 2, film morphology. Type 1 sensors display an increased sensor response in the presence of carbon monoxide while Type 2 sensors display a decreased response to carbon monoxide. The methods and sensors disclosed herein are particularly suitable for use in proton exchange membrane fuel cells (PEMFCs).

McDaniel; Anthony H. (Livermore, CA), Medlin; J. Will (Boulder, CO), Bastasz; Robert J. (Livermore, CA)

2007-09-04T23:59:59.000Z

11

Tape-cast sensors and method of making  

DOE Patents [OSTI]

A method of making electrochemical sensors in which an electrolyte material is cast into a tape. Prefabricated electrodes are then partially embedded between two wet layers of the electrolyte tape to form a green sensor, and the green sensor is then heated to sinter the electrolyte tape around the electrodes. The resulting sensors can be used in applications such as, but not limited to, combustion control, environmental monitoring, and explosive detection. A electrochemical sensor formed by the tape-casting method is also disclosed.

Mukundan, Rangachary (Santa Fe, NM); Brosha, Eric L. (Los Alamos, NM); Garzon, Fernando H. (Santa Fe, NM)

2009-08-18T23:59:59.000Z

12

Energy Saving Methods in Wireless Sensor Networks.  

E-Print Network [OSTI]

?? To predict the lifetime of wireless sensor networks before their installation is an important concern. The IEEE 802.15.4 standard is specifically meant to support (more)

JAWAD ALI, SYED

2008-01-01T23:59:59.000Z

13

Active carbon filter health condition detection with piezoelectric wafer active sensors  

E-Print Network [OSTI]

Active carbon filter health condition detection with piezoelectric wafer active sensors Jingjing Chemical Biological Center, 5183 Blackhawk Road, APG, MD USA 21010 ABSTRACT The impregnated active carbon in active carbon filters by combining the electromechanical impedance spectroscopy (EMIS

Giurgiutiu, Victor

14

Universal signal processing method for multimode reflective sensors  

E-Print Network [OSTI]

sensitivity, but the sensor configuration is complicated and requires the use of expensive lasers and single mode fibers. Amplitude modulation trades sensitivity for low cost and ease of configuration by using light emitting diodes and multimode fibers. A... method for reflective sensors using optical fibers as the data transmission media. The proposed transmitter - receiver unit was based on the amplitude modulation of reflected optical signals. This involves the use of an light emitting diode (LED...

Larson, Robert Eugene

2012-06-07T23:59:59.000Z

15

Passive tire pressure sensor and method  

DOE Patents [OSTI]

A surface acoustic wave device includes a micro-machined pressure transducer for monitoring tire pressure. The device is configured having a micro-machined cavity that is sealed with a flexible conductive membrane. When an external tire pressure equivalent to the cavity pressure is detected, the membrane makes contact with ridges on the backside of the surface acoustic wave device. The ridges are electrically connected to conductive fingers of the device. When the detected pressure is correct, selected fingers on the device will be grounded producing patterned acoustic reflections to an impulse RF signal. When the external tire pressure is less than the cavity reference pressure, a reduced reflected signal to the receiver results. The sensor may further be constructed so as to identify itself by a unique reflected identification pulse series.

Pfeifer, Kent Bryant (Los Lunas, NM); Williams, Robert Leslie (Albuquerque, NM); Waldschmidt, Robert Lee (Calgary, CA); Morgan, Catherine Hook (Ann Arbor, MI)

2007-09-04T23:59:59.000Z

16

Well casing-based geophysical sensor apparatus, system and method  

DOE Patents [OSTI]

A geophysical sensor apparatus, system, and method for use in, for example, oil well operations, and in particular using a network of sensors emplaced along and outside oil well casings to monitor critical parameters in an oil reservoir and provide geophysical data remote from the wells. Centralizers are affixed to the well casings and the sensors are located in the protective spheres afforded by the centralizers to keep from being damaged during casing emplacement. In this manner, geophysical data may be detected of a sub-surface volume, e.g. an oil reservoir, and transmitted for analysis. Preferably, data from multiple sensor types, such as ERT and seismic data are combined to provide real time knowledge of the reservoir and processes such as primary and secondary oil recovery.

Daily, William D. (Livermore, CA)

2010-03-09T23:59:59.000Z

17

Embedded Ultrasonics NDE with Piezoelectric Wafer Active Sensors  

E-Print Network [OSTI]

Embedded Ultrasonics NDE with Piezoelectric Wafer Active Sensors Victor Giurgiutiu Department (NDE) is described. PWAS structure and principle of operation are presented. The interaction between exciting certain Lamb wave modes are identified. Recent trends in guided-wave ultrasonic NDE and damage

Giurgiutiu, Victor

18

Micro optical fiber light source and sensor and method of fabrication thereof  

DOE Patents [OSTI]

This invention relates generally to the development of and a method of fabricating a fiber optic micro-light source and sensor (50). An optical fiber micro-light source (50) is presented whose aperture is extremely small yet able to act as an intense light source. Light sources of this type have wide ranging applications, including use as micro-sensors (22) in NSOM. Micro-sensor light sources have excellent detection limits as well as photo stability, reversibility, and millisecond response times. Furthermore, a method for manufacturing a micro optical fiber light source is provided. It involves the photo-chemical attachment of an optically active material onto the end surface of an optical fiber cable which has been pulled to form an end with an extremely narrow aperture. More specifically, photopolymerization has been applied as a means to photo-chemically attach an optically active material (60). This process allows significant control of the size of the micro light source (50). Furthermore, photo-chemically attaching an optically active material (60) enables the implementation of the micro-light source in a variety of sensor applications.

Kopelman, Raoul (Ann Arbor, MI); Tan, Weihong (Ames, IA); Shi, Zhong-You (Ann Arbor, MI)

1997-01-01T23:59:59.000Z

19

Micro optical fiber light source and sensor and method of fabrication thereof  

DOE Patents [OSTI]

This invention relates generally to the development of and a method of fabricating a fiber optic micro-light source and sensor. An optical fiber micro-light source is presented whose aperture is extremely small yet able to act as an intense light source. Light sources of this type have wide ranging applications, including use as micro-sensors in NSOM. Micro-sensor light sources have excellent detection limits as well as photo stability, reversibility, and millisecond response times. Furthermore, a method for manufacturing a micro optical fiber light source is provided. It involves the photo-chemical attachment of an optically active material onto the end surface of an optical fiber cable which has been pulled to form an end with an extremely narrow aperture. More specifically, photopolymerization has been applied as a means to photo-chemically attach an optically active material. This process allows significant control of the size of the micro light source. Furthermore, photo-chemically attaching an optically active material enables the implementation of the micro-light source in a variety of sensor applications. 10 figs.

Kopelman, R.; Tan, W.; Shi, Z.Y.

1997-05-06T23:59:59.000Z

20

Methods for determining infrasound phase velocity direction with an array of line sensors  

E-Print Network [OSTI]

Methods for determining infrasound phase velocity direction with an array of line sensors to the number of these point sensors; additional sensors help attenuate noise and improve direction resolution. An alternative approach is to form an array of directional line sensors, each of which emulates a line of many

Vernon, Frank

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


21

Sensors and Actuators B 125 (2007) 489497 A pattern recognition method for electronic noses  

E-Print Network [OSTI]

Sensors and Actuators B 125 (2007) 489­497 A pattern recognition method for electronic noses based from a chemical sensor array of electronic noses, which makes the system more bionics. This paper-two-dimensional feature vectors of a sensor array consisting of eight sensors, in which four features were extracted from

Freeman, Walter J.

22

Active resonant subwavelength grating for scannerless range imaging sensors.  

SciTech Connect (OSTI)

In this late-start LDRD, we will present a design for a wavelength-agile, high-speed modulator that enables a long-term vision for the THz Scannerless Range Imaging (SRI) sensor. It takes the place of the currently-utilized SRI micro-channel plate which is limited to photocathode sensitive wavelengths (primarily in the visible and near-IR regimes). Two of Sandia's successful technologies--subwavelength diffractive optics and THz sources and detectors--are poised to extend the capabilities of the SRI sensor. The goal is to drastically broaden the SRI's sensing waveband--all the way to the THz regime--so the sensor can see through image-obscuring, scattering environments like smoke and dust. Surface properties, such as reflectivity, emissivity, and scattering roughness, vary greatly with the illuminating wavelength. Thus, objects that are difficult to image at the SRI sensor's present near-IR wavelengths may be imaged more easily at the considerably longer THz wavelengths (0.1 to 1mm). The proposed component is an active Resonant Subwavelength Grating (RSG). Sandia invested considerable effort on a passive RSG two years ago, which resulted in a highly-efficient (reflectivity greater than gold), wavelength-specific reflector. For this late-start LDRD proposal, we will transform the passive RSG design into an active laser-line reflector.

Kemme, Shanalyn A.; Nellums, Robert O.; Boye, Robert R.; Peters, David William

2006-11-01T23:59:59.000Z

23

Ferroelectric Thin-Film Active Sensors for Structural Health , Victor Giurgiutiu1  

E-Print Network [OSTI]

, Structural health monitoring 1. INTRODUCTION 1.1 Background Piezoelectric wafer active sensors have beenFerroelectric Thin-Film Active Sensors for Structural Health Monitoring Bin Lin1 , Victor laboratory, Penn State University, University Park, PA 16802 ABSTRACT Piezoelectric wafer active sensors

Giurgiutiu, Victor

24

Oscillatory motion based measurement method and sensor for measuring wall shear stress due to fluid flow  

DOE Patents [OSTI]

A shear stress sensor for measuring fluid wall shear stress on a test surface is provided. The wall shear stress sensor is comprised of an active sensing surface and a sensor body. An elastic mechanism mounted between the active sensing surface and the sensor body allows movement between the active sensing surface and the sensor body. A driving mechanism forces the shear stress sensor to oscillate. A measuring mechanism measures displacement of the active sensing surface relative to the sensor body. The sensor may be operated under periodic excitation where changes in the nature of the fluid properties or the fluid flow over the sensor measurably changes the amplitude or phase of the motion of the active sensing surface, or changes the force and power required from a control system in order to maintain constant motion. The device may be operated under non-periodic excitation where changes in the nature of the fluid properties or the fluid flow over the sensor change the transient motion of the active sensor surface or change the force and power required from a control system to maintain a specified transient motion of the active sensor surface.

Armstrong, William D. (Laramie, WY); Naughton, Jonathan (Laramie, WY); Lindberg, William R. (Laramie, WY)

2008-09-02T23:59:59.000Z

25

Heat-activated Plasmonic Chemical Sensors for Harsh Environments  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

cnse.albany.edu cnse.albany.edu Heat-activated Plasmonic Chemical Sensors for Harsh Environments Dr. Michael A. Carpenter College of NanoScale Science and Engineering Energy & Environmental Technology Applications Center University at Albany - SUNY Dr. Sang-Hyun Oh Department of Electrical and Computer Engineering University of Minnesota-Twin Cities 6/11/13 ! Oh group, University of Minnesota Carpenter Group, CNSE cnse.albany.edu Harsh Environment Chemical Sensors Nanocomposite Materials * Optical analysis of Au SPR bands * YSZ, TiO 2 , CeO 2 matrix materials * 500-800°C operating environment * SOFC, Jet engines, turbines * CO, H 2 , NO x , R x S Goals of Research are Two-Fold 1. Develop prototype nanorod materials for use in next generation sensing devices

26

Micro optical fiber light source and sensor and method of fabrication thereof  

DOE Patents [OSTI]

This invention relates generally to the development of and a method of fabricating a micro optical fiber light source. An optical fiber micro-light source is presented whose aperture is extremely small yet able to act as an intense light source. Light sources of this type have wide ranging applications, including use as micro-sensors in NSOM. Micro-sensor light sources have excellent detection limits as well as photo stability, reversibility, and millisecond response times. Furthermore, a method for manufacturing a micro optical fiber light source is provided. It involves the photo-chemical attachment of an optically active material onto the end surface of an optical fiber cable which has been pulled to form an end with an extremely narrow aperture. More specifically, photopolymerization has been applied as a means to photo-chemically attach an optically active material. This process allows significant control of the size of the micro light source. Furthermore, photo-chemically attaching an optically active material enables the implementation of the micro-light source in a variety of sensor applications. 4 figs.

Kopelman, R.; Tan, W.; Shi, Z.Y.

1994-11-01T23:59:59.000Z

27

Micro optical fiber light source and sensor and method of fabrication thereof  

DOE Patents [OSTI]

This invention relates generally to the development of and a method of fabricating a micro optical fiber light source. An optical fiber micro-light source is presented whose aperture is extremely small yet able to act as an intense light source. Light sources of this type have wide ranging applications, including use as micro-sensors in NSOM. Micro-sensor light sources have excellent detection limits as well as photo stability, reversibility, and millisecond response times. Furthermore, a method for manufacturing a micro optical fiber light source is provided. It involves the photo-chemical attachment of an optically active material onto the end surface of an optical fiber cable which has been pulled to form an end with an extremely narrow aperture. More specifically, photopolymerization has been applied as a means to photo-chemically attach an optically active material. This process allows significant control of the size of the micro light source. Furthermore, photo-chemically attaching an optically active material enables the implementation of the micro-light source in a variety of sensor applications.

Kopelman, Raoul (Ann Arbor, MI); Tan, Weihong (Ann Arbor, MI); Shi, Zhong-You (Ann Arbor, MI)

1994-01-01T23:59:59.000Z

28

A CMOS Active Pixel Sensor for Charged Particle Detection  

SciTech Connect (OSTI)

Active Pixel Sensor (APS) technology has shown promise for next-generation vertex detectors. This paper discusses the design and testing of two generations of APS chips. Both are arrays of 128 by 128 pixels, each 20 by 20 {micro}m. Each array is divided into sub-arrays in which different sensor structures (4 in the first version and 16 in the second) and/or readout circuits are employed. Measurements of several of these structures under Fe{sup 55} exposure are reported. The sensors have also been irradiated by 55 MeV protons to test for radiation damage. The radiation increased the noise and reduced the signal. The noise can be explained by shot noise from the increased leakage current and the reduction in signal is due to charge being trapped in the epi layer. Nevertheless, the radiation effect is small for the expected exposures at RHIC and RHIC II. Finally, we describe our concept for mechanically supporting a thin silicon wafer in an actual detector.

Matis, Howard S.; Bieser, Fred; Kleinfelder, Stuart; Rai, Gulshan; Retiere, Fabrice; Ritter, Hans George; Singh, Kunal; Wurzel, Samuel E.; Wieman, Howard; Yamamoto, Eugene

2002-12-02T23:59:59.000Z

29

Method Of Signal Amplification In Multi-Chromophore Luminescence Sensors  

DOE Patents [OSTI]

A fluorescence-based method for highly sensitive and selective detection of analyte molecules is proposed. The method employs the energy transfer between two or more fluorescent chromophores in a carefully selected polymer matrix. In one preferred embodiment, signal amplification has been achieved in the fluorescent sensing of dimethyl methylphosphonate (DMMP) using two dyes, 3-aminofluoranthene (AM) and Nile Red (NR), in a hydrogen bond acidic polymer matrix. The selected polymer matrix quenches the fluorescence of both dyes and shifts dye emission and absorption spectra relative to more inert matrices. Upon DMMP sorption, the AM fluorescence shifts to the red at the same time the NR absorption shifts to the blue, resulting in better band overlap and increased energy transfer between chromophores. In another preferred embodiment, the sensitive material is incorporated into an optical fiber system enabling efficient excitation of the dye and collecting the fluorescent signal form the sensitive material on the remote end of the system. The proposed method can be applied to multichromophore luminescence sensor systems incorporating N-chromophores leading to N-fold signal amplification and improved selectivity. The method can be used in all applications where highly sensitive detection of basic gases, such as dimethyl methylphosphonate (DMMP), Sarin, Soman and other chemical warfare agents having basic properties, is required, including environmental monitoring, chemical industry and medicine.

Levitsky, Igor A. (Fall River, MA); Krivoshlykov, Sergei G. (Shrewsbury, MA)

2004-02-03T23:59:59.000Z

30

Adaptive Sensor Activity Scheduling in Distributed Sensor Networks: A Statistical Mechanics Approach  

E-Print Network [OSTI]

of spatial-temporal events. The sensor network is modeled as a Markov random field on a graph, where concepts and wireless communications have enabled usage of inexpensive and miniaturized sensor nodes [1­3] that can #12;Effective use of sensor networks requires resource-aware operation; once deployed, energy sources

Ray, Asok

31

Sensor abstractions for opportunistic activity and context recognition systems  

Science Journals Connector (OSTI)

Pervasive environments are inherently characterized to draw from sensor infrastructures in order to become situation aware. Very recent technological evolutions of sensor hardware (e.g. for geoposition, acceleration, orientation, noise, light, humidity, ...

Marc Kurz; Alois Ferscha

2010-11-01T23:59:59.000Z

32

CMOS Photodiodes with Substrate Openings for Higher Conversion Gain in Active Pixel Sensors  

E-Print Network [OSTI]

1 CMOS Photodiodes with Substrate Openings for Higher Conversion Gain in Active Pixel Sensors J. S' in photodiodes used in active pixel sensor. The discussion is based on experimental data from contact diffusion (n+ pepi) photodiodes fabricated on a standard 0.35 µm CMOS technology. I. Introduction The readout

Hornsey, Richard

33

Alzheimer's patient activity assessment using different sensors Carlos Fernando Crispim-Junior1  

E-Print Network [OSTI]

activity assessment for the estimation of older people performance in instrumental activities of daily trials on the evaluation of older people motor functions2-3 . The patients wore a chest or wrist sensor

Paris-Sud XI, Université de

34

Thin n-in-p planar pixel sensors and active edge sensors for the ATLAS upgrade at HL-LHC  

E-Print Network [OSTI]

Silicon pixel modules employing n-in-p planar sensors with an active thickness of 200 $\\mu$m, produced at CiS, and 100-200 $\\mu$m thin active/slim edge sensor devices, produced at VTT in Finland have been interconnected to ATLAS FE-I3 and FE-I4 read-out chips. The thin sensors are designed for high energy physics collider experiments to ensure radiation hardness at high fluences. Moreover, the active edge technology of the VTT production maximizes the sensitive region of the assembly, allowing for a reduced overlap of the modules in the pixel layer close to the beam pipe. The CiS production includes also four chip sensors according to the module geometry planned for the outer layers of the upgraded ATLAS pixel detector to be operated at the HL-LHC. The modules have been characterized using radioactive sources in the laboratory and with high precision measurements at beam tests to investigate the hit efficiency and charge collection properties at different bias voltages and particle incidence angles. The performance of the different sensor thicknesses and edge designs are compared before and after irradiation up to a fluence of $1.4\\times10^{16}n_{eq}/cm^{2}$.

S. Terzo; A. Macchiolo; R. Nisius; B. Paschen

2014-11-20T23:59:59.000Z

35

Robust Clock Synchronization Methods for Wireless Sensor Networks  

E-Print Network [OSTI]

Wireless sensor networks (WSNs) have received huge attention during the recent years due to their applications in a large number of areas such as environmental monitoring, health and traffic monitoring, surveillance and tracking, and monitoring...

Lee, Jae Han

2011-10-21T23:59:59.000Z

36

Title: Corrosion Damage Detection with Piezoelectric Wafer Active Sensors Authors: Dustin T. Thomas  

E-Print Network [OSTI]

0 Title: Corrosion Damage Detection with Piezoelectric Wafer Active Sensors Authors: Dustin T structural problems is corrosion. In fact the KC-135 now costs $1.2 billion a year to repair corrosion) in a pitch-catch configuration. The sensors were placed on a grid pattern. Material loss through corrosion

Giurgiutiu, Victor

37

The activated state of a sodium channel voltage sensor in a membrane environment  

Science Journals Connector (OSTI)

...suggests a displacement of ?4 elementary charges per subunit across...voltage sensor reveals a focused electric field . Nature 427 ( 6974...CA Horn R ( 2005 ) Focused electric field across the voltage sensor of potassium...protease activity for protamine resistance of Escherichia coli . Arch...

Sudha Chakrapani; Pornthep Sompornpisut; Pathumwadee Intharathep; Benot Roux; Eduardo Perozo

2010-01-01T23:59:59.000Z

38

Pro-active Strategies for the Frugal Feeding Problem in Wireless Sensor Networks  

E-Print Network [OSTI]

Sensor Networks. The FFP attempts to find energy-efficient routes for a mobile service entity for the case of a fixed rendezvous location (i.e., service facility with limited number of docking ports) and mobile capable entities (sensors). Our pro-active solution reduces the FFP to finding energy

Lanthier, Mark

39

Temperature measurement method using temperature coefficient timing for resistive or capacitive sensors  

DOE Patents [OSTI]

A method and apparatus for temperature measurement especially suited for low cost, low power, moderate accuracy implementation. It uses a sensor whose resistance varies in a known manner, either linearly or nonlinearly, with temperature, and produces a digital output which is proportional to the temperature of the sensor. The method is based on performing a zero-crossing time measurement of a step input signal that is double differentiated using two differentiators functioning as respective first and second time constants; one temperature stable, and the other varying with the sensor temperature. 5 figs.

Britton, C.L. Jr.; Ericson, M.N.

1999-01-19T23:59:59.000Z

40

Oxazine-based sensor for contaminant detection, fabrication method therefor, and uses thereof  

DOE Patents [OSTI]

A sensor, a method for its fabrication, and a method for its use to detect contaminants, for example, ammonia, in stagnant and dynamic fluid media, especially liquid media. The sensor is an opto-chemical sensor that includes a polymer optical fiber, a sensing layer comprising oxazine 170 perchlorate on the polymer optical fiber, and a membrane layer on the sensing layer. The membrane layer is gas permeable and not permeable to the fluid in the fluid system, and moisture is entrapped by and between the sensing and membrane layers.

Nnanna, Agbai Agwu; Jalal, Ahmed Hasnian

2014-05-27T23:59:59.000Z

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


41

An elastic-spring-substrated nanogenerator as an active sensor for self-powered balance  

E-Print Network [OSTI]

demonstrated in various elds, such as heart- beating pulse diagnosis,13 tyre pressure/speed measurement,14 wind-substrated nanogenerator (SNG) was fabricated to accomplish the monolithic integration of an active sensor device onto

Wang, Zhong L.

42

NRA-00-OES-08 A one-year pilot study for the inclusion of active optical sensors into PALACE  

E-Print Network [OSTI]

NRA-00-OES-08 1 A one-year pilot study for the inclusion of active optical sensors into PALACE, newly-developed solid-state, active optical sensors that measure chlorophyll a fluorescence of ancillary sensors as part of the ARGO program. The ARGO program, if funded at the level of effort proposed

Boss, Emmanuel S.

43

Apparatus and method for detecting electromagnetic radiation using electron photoemission in a micromechanical sensor  

DOE Patents [OSTI]

A micromechanical sensor and method for detecting electromagnetic radiation involve producing photoelectrons from a metal surface in contact with a semiconductor. The photoelectrons are extracted into the semiconductor, which causes photo-induced bending. The resulting bending is measured, and a signal corresponding to the measured bending is generated and processed. A plurality of individual micromechanical sensors can be arranged in a two-dimensional matrix for imaging applications.

Datskos, Panagiotis G. (Knoxville, TN); Rajic, Slobodan (Knoxville, TN); Datskou, Irene C. (Knoxville, TN); Egert, Charles M. (Oak Ridge, TN)

2002-01-01T23:59:59.000Z

44

Comparison of POLDER Cloud Phase Retrievals to Active Remote Sensors Measurements at the ARM SGP Site  

SciTech Connect (OSTI)

In our present study, cloud boundaries derived from a combination of active remote sensors at the ARM SGP site are compared to POLDER cloud top phase index which is derived from polarimetric measurements using an innovative method. This approach shows the viability of the POLDER phase retrieval algorithm, and also leads to interesting results. In particular, the analysis demonstrates the sensitivity of polarization measurements to ice crystal shape and indicates that occurrence of polycrystalline ice clouds has to be taken into account in order to improve the POLDER phase retrieval algorithm accuracy. Secondly, the results show that a temperature threshold of 240 K could serve for cloud top particle phase classification. Considering the limitations of the analysis, the temperature threshold could be biased high, but not by more than about 5 degrees.

Riedi, J.; Goloub, P.; Marchand, Roger T.

2001-06-01T23:59:59.000Z

45

Apparatus and method for imaging metallic objects using an array of giant magnetoresistive sensors  

DOE Patents [OSTI]

A portable, low-power, metallic object detector and method for providing an image of a detected metallic object. In one embodiment, the present portable low-power metallic object detector an array of giant magnetoresistive (GMR) sensors. The array of GMR sensors is adapted for detecting the presence of and compiling image data of a metallic object. In the embodiment, the array of GMR sensors is arranged in a checkerboard configuration such that axes of sensitivity of alternate GMR sensors are orthogonally oriented. An electronics portion is coupled to the array of GMR sensors. The electronics portion is adapted to receive and process the image data of the metallic object compiled by the array of GMR sensors. The embodiment also includes a display unit which is coupled to the electronics portion. The display unit is adapted to display a graphical representation of the metallic object detected by the array of GMR sensors. In so doing, a graphical representation of the detected metallic object is provided.

Chaiken, Alison (Fremont, CA)

2000-01-01T23:59:59.000Z

46

Autonomous Correction of Sensor Data Applied to Building Technologies Using Filtering Methods  

SciTech Connect (OSTI)

Sensor data validity is extremely important in a number of applications, particularly building technologies where collected data are used to determine performance. An example of this is Oak Ridge National Laboratory s ZEBRAlliance research project, which consists of four single-family homes located in Oak Ridge, TN. The homes are outfitted with a total of 1,218 sensors to determine the performance of a variety of different technologies integrated within each home. Issues arise with such a large amount of sensors, such as missing or corrupt data. This paper aims to eliminate these problems using: (1) Kalman filtering and (2) linear prediction filtering techniques. Five types of data are the focus of this paper: (1) temperature; (2) humidity; (3) energy consumption; (4) pressure; and (5) airflow. Simulations show the Kalman filtering method performed best in predicting temperature, humidity, pressure, and airflow data, while the linear prediction filtering method performed best with energy consumption data.

Castello, Charles C [ORNL] [ORNL; New, Joshua Ryan [ORNL] [ORNL; Smith, Matt K [ORNL] [ORNL

2013-01-01T23:59:59.000Z

47

Autonomous Correction of Sensor Data Applied to Building Technologies Using Filtering Methods  

E-Print Network [OSTI]

, and airflow data, while the LPC method performed best with energy consumption data. Keywords--sensor systems inefficient buildings with new and innovative technologies that help to curb energy consumption will reduce Charles C. Castello1 and Joshua R. New2 Energy Transportation and Science Division Oak Ridge National

Wang, Xiaorui "Ray"

48

Method and system for gathering a library of response patterns for sensor arrays  

DOE Patents [OSTI]

A method of gathering a library of response patterns for one or more sensor arrays used in the detection and identification of chemical components in a fluid includes the steps of feeding samples of fluid with time-spaced separation of known components to the sensor arrays arranged in parallel or series configurations. Modifying elements such as heating filaments of differing materials operated at differing temperatures are included in the configurations to duplicate operational modes designed into the portable detection systems with which the calibrated sensor arrays are to be used. The response patterns from the known components are collected into a library held in the memory of a microprocessor for comparison with the response patterns of unknown components.

Zaromb, Solomon (Hinsdale, IL)

1992-01-01T23:59:59.000Z

49

Corrosion Damage Detection with Piezoelectric Wafer Active Sensors Dustin Thomas, John Welter  

E-Print Network [OSTI]

1 Corrosion Damage Detection with Piezoelectric Wafer Active Sensors Dustin Thomas, John Welter Air a priority issue for today's Air Force. One of the most critical structural problems is corrosion. In fact the KC-135 now costs $1.2 billion a year to repair corrosion. In this paper, we plan to show the use

Giurgiutiu, Victor

50

Implementation and Testing of Fault-Tolerant Photodiode-based Active Pixel Sensor (APS)  

E-Print Network [OSTI]

Implementation and Testing of Fault-Tolerant Photodiode-based Active Pixel Sensor (APS) Sunjaya the photodiode and readout transistors into two parallel operating devices, while keeping a common row select-tolerant photodiode APS was designed and fabricated using a CMOS 0.18µm process. Testing included both fully

Chapman, Glenn H.

51

Fault Tolerant Photodiode and Photogate Active Pixel Sensors , Glenn H. Chapmana  

E-Print Network [OSTI]

Fault Tolerant Photodiode and Photogate Active Pixel Sensors Cory Junga , Glenn H. Chapmana, this design can correct for most defects allowing for higher production yields. Fault tolerant photodiode and photogate APS' were fabricated in 0.18-micron technology. Testing showed that the photodiode APS could

Chapman, Glenn H.

52

Characteristics of Fault-Tolerant Photodiode and Photogate Active Pixel Sensor (APS)  

E-Print Network [OSTI]

Characteristics of Fault-Tolerant Photodiode and Photogate Active Pixel Sensor (APS) Michelle L. La tolerant APS design has been implemented in a 0.18µm CMOS process for both a photodiode based and photogate of 2.03 (stuck low) and 1.89 (stuck high) for the photodiode based APS, and 1.73 (stuck low) and 1

Chapman, Glenn H.

53

Nanogenerator as an active sensor for vortex capture and ambient wind-velocity detection  

E-Print Network [OSTI]

and mechanical (wind, water flow, vibration, friction and body movement) energies are common in the ambientNanogenerator as an active sensor for vortex capture and ambient wind-velocity detection Rui Zhang principle, ambient wind-speed measurements with the NG are demonstrated. Due to the simple structure, high

Wang, Zhong L.

54

LAMB-WAVE EMBEDDED NDE WITH PIEZOELECTRIC WAFER ACTIVE SENSORS FOR STRUCTURAL HEALTH MONITORING OF  

E-Print Network [OSTI]

LAMB-WAVE EMBEDDED NDE WITH PIEZOELECTRIC WAFER ACTIVE SENSORS FOR STRUCTURAL HEALTH MONITORING waves and enable the development of embedded NDE concepts. This paper will present two embedded NDE Embedded nondestructive evaluation (E-NDE) is an emerging technology that aims at performing NDE testing

Giurgiutiu, Victor

55

Participatory sensing in public spaces: activating urban surfaces with sensor probes  

Science Journals Connector (OSTI)

Recent convergence between low-cost technology, artform and political discourse presents a new design space for enabling public participation and expression. We explore non-experts' use of place-based, modular sensors to activate, author and provoke ... Keywords: participatory sensing, public spaces, urban probes

Stacey Kuznetsov; Eric Paulos

2010-08-01T23:59:59.000Z

56

BodyScope: A Wearable Acoustic Sensor for Activity Recognition  

E-Print Network [OSTI]

, speaking, laughing, and coughing. The F-measure of the Support Vector Machine classification of 12 of activities (e.g., eating, drinking, speaking, laughing and coughing) with BodyScope reveals that the system

Toronto, University of

57

Sensor, method and system of monitoring transmission lines  

SciTech Connect (OSTI)

An apparatus, method, and system for measuring the magnetic field produced by phase conductors in multi-phase power lines. The magnetic field measurements are used to determine the current load on the conductors. The magnetic fields are sensed by coils placed sufficiently proximate the lines to measure the voltage induced in the coils by the field without touching the lines. The x and y components of the magnetic fields are used to calculate the conductor sag, and then the sag data, along with the field strength data, can be used to calculate the current load on the line and the phase of the current. The sag calculations of this invention are independent of line voltage and line current measurements. The system applies a computerized fitter routine to measured and sampled voltages on the coils to accurately determine the values of parameters associated with the overhead phase conductors.

Syracuse, Steven J.; Clark, Roy; Halverson, Peter G.; Tesche, Frederick M.; Barlow, Charles V.

2012-10-02T23:59:59.000Z

58

Optical humidity sensors based on titania films fabricated by sol?gel and thermal evaporation methods  

Science Journals Connector (OSTI)

This paper reports a comparative study of an optical humidity sensor based on titania films fabricated by sol?gel and thermal evaporation methods. As semiconducting oxides are known for their n-type conduction because of the presence of oxygen vacancies, therefore they prove to be very good sensors for humidity. Sensing elements of the optical humidity sensor presented here consist of a rutile structured one-layered TiO2 thin film deposited on the base of an isosceles glass prism of thickness 1000 ?. This TiO2 film is porous and sensitive to humidity. The other sensing element consists of a film of the same material deposited by the thermal evaporation method on the base of a prism of the same thickness. Light from a He?Ne laser enters the prism from one of the isosceles faces of the prism and gets reflected from the glass?film interface, before emerging out from its other isosceles face. The emergent beam is collected through an optical fibre, which is connected to an optical power meter for measurement. Variations in the intensity of light caused by changes in humidity lying in the range of 5% RH to 95% RH have been recorded. A sensor fabricated by the thermal evaporation method shows better sensitivity than the sol?gel method. Scanning electron micrographs of both the films show that the film prepared by the thermal evaporation method is more porous and continuous than the film prepared by the sol?gel method, resulting in more sensitivity to humidity.

B C Yadav; N K Pandey; Amit K Srivastava; Preeti Sharma

2007-01-01T23:59:59.000Z

59

Lab 9: Sensor Characterization Lab (Digital) This lab introduces the methods and importance for characterizing sensors. Students will  

E-Print Network [OSTI]

and importance for characterizing sensors. Students will learn about how the Arduino communicates and receives the sensor with either the MakeBlock shield or just wires. Materials 1) Arduino Uno 2) MakeBlock Shield 3. For the arduino, the digital pin transitions between input and output. In the output mode, a LOW-HIGH-LOW signal

Wedeward, Kevin

60

A method for detecting breakthrough of organic solvent vapors in a charcoal tube using semiconductor gas sensors  

SciTech Connect (OSTI)

This study developed a method for detecting organic vapors that break through charcoal tubes, using semiconductor gas sensors as a breakthrough detector of vapors. A glass column equipped with two sensors was inserted in Teflon tubing, and air containing organic vapor was introduced at a constant flow rate. After the output signal of the sensors became stable, a charcoal tube was inserted into the tubing at the upstream of the sensors. The resistance of the sensors was collected temporally in an integrated circuit (IC) card. The vapor concentration of the air near the sensors was measured with a gas chromatograph (GC) equipped with a flame ionization detector (FID) at intervals of 5 minutes to obtain the breakthrough curve. When the relative humidity was zero, the output signals of the sensors began to change before the breakthrough point (1% breakthrough time). This tendency was almost the same for methyl acetate, ethyl acetate, isopropyl alcohol (IPA), toluene, and chloroform. For dichloromethane and 1,1,1-trichloroethane, the time when the sensor output signals began to rise was almost the same as the breakthrough point. When the relative humidity was 80 percent, the sensors could also detect many vapors before the breakthrough point, but they could not perceive dichloromethane and chloroform vapors. A personal sampling system with a breakthrough detector was developed and its availability is discussed.

Hori, Hajime; Noritake, Yuji; Murobushi, Hisako; Higashi, Toshiaki; Tanaka, Isamu

1999-08-01T23:59:59.000Z

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


61

Soil chemical sensor and precision agricultural chemical delivery system and method  

DOE Patents [OSTI]

A real time soil chemical sensor and precision agricultural chemical delivery system includes a plurality of ground-engaging tools in association with individual soil sensors which measure soil chemical levels. The system includes the addition of a solvent which rapidly saturates the soil/tool interface to form a conductive solution of chemicals leached from the soil. A multivalent electrode, positioned within a multivalent frame of the ground-engaging tool, applies a voltage or impresses a current between the electrode and the tool frame. A real-time soil chemical sensor and controller senses the electrochemical reaction resulting from the application of the voltage or current to the leachate, measures it by resistivity methods, and compares it against pre-set resistivity levels for substances leached by the solvent. Still greater precision is obtained by calibrating for the secondary current impressed through solvent-less soil. The appropriate concentration is then found and the servo-controlled delivery system applies the appropriate amount of fertilizer or agricultural chemicals substantially in the location from which the soil measurement was taken. 5 figures.

Colburn, J.W. Jr.

1991-07-23T23:59:59.000Z

62

Self-activated ultrahigh chemosensitivity of oxide thin film nanostructures for transparent sensors  

E-Print Network [OSTI]

One of the top design priorities for semiconductor chemical sensors is developing simple, low-cost, sensitive and reliable sensors to be built in handheld devices. However, the need to implement heating elements in sensor ...

Moon, Hi Gyu

63

Lab 8: Sensor Characterization Lab (Analog) This lab introduces the methods and importance for characterizing sensors. Students will  

E-Print Network [OSTI]

and importance for characterizing sensors. Students will learn about how the Arduino interprets an analog signal at different angles. Materials 1) Arduino Uno 2) MakeBlock Shield 3) Virtuabotix Accelerometer 4) Make which is proportional to the measured value (like a thermometer and liquid height). The arduino measures

Wedeward, Kevin

64

Sharp and fast: Sensors and switches based on polymer brushes with adsorption-active minority chains  

E-Print Network [OSTI]

We propose a design for polymer-based sensors and switches with sharp switching transition and fast response time. The switching mechanism involves a radical change in the conformations of adsorption-active minority chains in a brush. Such transitions can be induced by a temperature change of only about ten degrees, and the characteristic time of the conformational change is less than a second. We present an analytical theory for these switches and support it by self-consistent field calculations and Brownian dynamics simulations.

Leonid I. Klushin; Alexander M. Skvortsov; Alexey A. Polotsky; Shuanhu Qi; Friederike Schmid

2014-12-16T23:59:59.000Z

65

Improved Engine Control Strategies Enabled by Digital Signal-Processing Method for Zirconia Exhaust Sensors  

Broader source: Energy.gov [DOE]

A new approach for wideband O2 sensor control that treats a pump-cell sensor not as a feedback controlled system, but as the analog? front-end of a modified Delta-Sigma analog-to-Digital Converter

66

Pressure sensor and Telemetry methods for measurement while drilling in geothermal wells  

Broader source: Energy.gov [DOE]

Project objective: Develop telemetry electronics and pressure sensor system for operation at 300C and demonstrate the operation of multiple pressure sensor systems at 300C.

67

EPAct Transportation Regulatory Activities: Compliance Methods for State  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Compliance Methods for State and Alternative Fuel Provider Fleets to someone by E-mail Share EPAct Transportation Regulatory Activities: Compliance Methods for State and Alternative Fuel Provider Fleets on Facebook Tweet about EPAct Transportation Regulatory Activities: Compliance Methods for State and Alternative Fuel Provider Fleets on Twitter Bookmark EPAct Transportation Regulatory Activities: Compliance Methods for State and Alternative Fuel Provider Fleets on Google Bookmark EPAct Transportation Regulatory Activities: Compliance Methods for State and Alternative Fuel Provider Fleets on Delicious Rank EPAct Transportation Regulatory Activities: Compliance Methods for State and Alternative Fuel Provider Fleets on Digg Find More places to share EPAct Transportation Regulatory

68

Studying Altocumulus with Ice Virga Using Ground-Based Active and Passive Remote Sensors  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Studying Altocumulus with Ice Virga Using Ground-Based Studying Altocumulus with Ice Virga Using Ground-Based Active and Passive Remote Sensors Z. Wang Goddard Earth Science and Technology Center University of Maryland, Baltimore County College Park, Maryland Z. Wang, D. N. Whiteman, and B. B. Demoz Mesoscale Atmospheric Processes Branch National Aeronautics and Space Administration Goddard Space Flight Center Greenbelt, Maryland K. Sassen Geophysical Institute University of Alaska Fairbanks, Alaska Introduction Clouds not only play crucial roles in regulating the Earth-atmosphere system energy budget, but also the atmospheric hydrological cycle. The impact of a cloud system strongly depends on the cloud microphysical properties and its vertical extent (Stephens et al. 1990). Although clouds can contain only

69

Pipeline Structural Health Monitoring Using Macro-fiber Composite Active Sensors  

SciTech Connect (OSTI)

The United States economy is heavily dependent upon a vast network of pipeline systems to transport and distribute the nation's energy resources. As this network of pipelines continues to age, monitoring and maintaining its structural integrity remains essential to the nation's energy interests. Numerous pipeline accidents over the past several years have resulted in hundreds of fatalities and billions of dollars in property damages. These accidents show that the current monitoring methods are not sufficient and leave a considerable margin for improvement. To avoid such catastrophes, more thorough methods are needed. As a solution, the research of this thesis proposes a structural health monitoring (SHM) system for pipeline networks. By implementing a SHM system with pipelines, their structural integrity can be continuously monitored, reducing the overall risks and costs associated with current methods. The proposed SHM system relies upon the deployment of macro-fiber composite (MFC) patches for the sensor array. Because MFC patches are flexible and resilient, they can be permanently mounted to the curved surface of a pipeline's main body. From this location, the MFC patches are used to monitor the structural integrity of the entire pipeline. Two damage detection techniques, guided wave and impedance methods, were implemented as part of the proposed SHM system. However, both techniques utilize the same MFC patches. This dual use of the MFC patches enables the proposed SHM system to require only a single sensor array. The presented Lamb wave methods demonstrated the ability to correctly identify and locate the presence of damage in the main body of the pipeline system, including simulated cracks and actual corrosion damage. The presented impedance methods demonstrated the ability to correctly identify and locate the presence of damage in the flanged joints of the pipeline system, including the loosening of bolts on the flanges. In addition to damage to the actual pipeline itself, the proposed methods were used to demonstrate the capability of detecting deposits inside of pipelines. Monitoring these deposits can prevent clogging and other hazardous situations. Finally, suggestions are made regarding future research issues which are needed to advance this research. Because the research of this thesis has only demonstrated the feasibility of the techniques for such a SHM system, these issues require attention before any commercial applications can be realized.

A.B. Thien

2006-03-01T23:59:59.000Z

70

Surface free-carrier screening effect on the output of a ZnO nanowire nanogenerator and its potential as a self-powered active gas sensor  

E-Print Network [OSTI]

potential as a self-powered active gas sensor This article has been downloaded from IOPscience. Please on the output of a ZnO nanowire nanogenerator and its potential as a self-powered active gas sensor Xinyu Xue1 as a power source, but also as a response signal to the gas, demonstrating a possible approach as a self-powered

Wang, Zhong L.

71

The performance of active spectral reflectance sensors as influenced by measuring distance, device temperature and light intensity  

Science Journals Connector (OSTI)

Spectral remote sensing is widely used for land-use management, agriculture, and crop management. Spectral sensors are most frequently adopted for site-specific fertiliser applications and, increasingly, for precision phenotyping. With the use of active ... Keywords: Fertilisation, Phenomics, Precision farming, Precision phenotyping, Site specific management

Sebastian Kipp; Bodo Mistele; Urs Schmidhalter

2014-01-01T23:59:59.000Z

72

Active magnetic regenerator method and apparatus  

DOE Patents [OSTI]

In an active magnetic regenerator apparatus having a regenerator bed of material exhibiting the magnetocaloric effect, flow of heat transfer fluid through the bed is unbalanced, so that more fluid flows through the bed from the hot side of the bed to the cold side than from the cold side to the hot side. The excess heat transfer fluid is diverted back to the hot side of the bed. The diverted fluid may be passed through a heat exchanger to draw heat from a fluid to be cooled. The apparatus may be operated at cryogenic temperatures, and the heat transfer fluid may be helium gas and the fluid to be cooled may be hydrogen gas, which is liquified by the device. The apparatus can be formed in multiple stages to allow a greater span of cooling temperatures than a single stage, and each stage may be comprised of two bed parts. Where two bed parts are employed in each stage, a portion of the fluid passing from the hot side to the cold side of a first bed part which does not have a magnetic field applied thereto is diverted back to the cold side of the other bed part in the stage, where it is passed through to the hot side. The remainder of the fluid from the cold side of the bed part of the first stage is passed to the hot side of the bed part of the second stage.

DeGregoria, Anthony J. (Madison, WI); Zimm, Carl B. (Madison, WI); Janda, Dennis J. (McFarland, WI); Lubasz, Richard A. (Deerfield, WI); Jastrab, Alexander G. (Oconomowoc, WI); Johnson, Joseph W. (Madison, WI); Ludeman, Evan M. (Austin, TX)

1993-01-01T23:59:59.000Z

73

Sensor response rate accelerator  

SciTech Connect (OSTI)

An apparatus and method for sensor signal prediction and for improving sensor signal response time, is disclosed. An adaptive filter or an artificial neural network is utilized to provide predictive sensor signal output and is further used to reduce sensor response time delay.

Vogt, Michael C. (Westmont, IL)

2002-01-01T23:59:59.000Z

74

X-RAY ACTIVE MATRIX PIXEL SENSORS BASEDON J-FET TECHNOLOGY DEVELOPED FOR THE LINAC COHERENT LIGHT SOURCE.  

SciTech Connect (OSTI)

An X-ray Active Matrix Pixel Sensor (XAMPS) is being developed for recording data for the X-ray Pump Probe experiment at the Linac Coherent Light Source (LCLS). Special attention has to be paid to some technological challenges that this design presents. New processes were developed and refined to address problems encountered during previous productions of XAMPS. The development of these critical steps and corresponding tests results are reported here.

CARINI,G.A.; CHEN, W.; LI, Z.; REHAK, P.; SIDDONS, D.P.

2007-10-29T23:59:59.000Z

75

Overview Of Electromagnetic Methods Applied In Active Volcanic Areas Of  

Open Energy Info (EERE)

Of Electromagnetic Methods Applied In Active Volcanic Areas Of Of Electromagnetic Methods Applied In Active Volcanic Areas Of Western United States Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Overview Of Electromagnetic Methods Applied In Active Volcanic Areas Of Western United States Details Activities (7) Areas (2) Regions (0) Abstract: A better understanding of active volcanic areas in the United States through electromagnetic geophysical studies received foundation from the many surveys done for geothermal exploration in the 1970's. Investigations by governmental, industrial, and academic agencies include (but are not limited to) mapping of the Cascades. Long Valley/Mono area, the Jemez volcanic field, Yellowstone Park, and an area in Colorado. For one example - Mt. Konocti in the Mayacamas Mountains, California - gravity,

76

Activity recognition in the home setting using simple and ubiquitous sensors  

E-Print Network [OSTI]

During the past several years, researchers have demonstrated that when new wireless sensors are placed in the home environment, data collected from them can be used by software to automatically infer context, such as the ...

Munguia Tapia, Emmanuel, 1978-

2003-01-01T23:59:59.000Z

77

Autonomous Correction of Sensor Data Applied to Building Technologies Using Filtering Methods  

E-Print Network [OSTI]

and commercial buildings consume 41% of primary energy (72% electricity) used in the U.S. · Retrofitting inefficient buildings with new and innovative technologies that help to curb energy consumption will reduce filters. · Specifically, temperature, humidity, energy usage, pressure, and airflow sensor data is used

Wang, Xiaorui "Ray"

78

A simple and low-cost biofilm quantification method using LED and CMOS image sensor  

Science Journals Connector (OSTI)

Abstract A novel biofilm detection platform, which consists of a cost-effective red, green, and blue light-emitting diode (RGB LED) as a light source and a lens-free CMOS image sensor as a detector, is designed. This system can measure the diffraction patterns of cells from their shadow images, and gather light absorbance information according to the concentration of biofilms through a simple image processing procedure. Compared to a bulky and expensive commercial spectrophotometer, this platform can provide accurate and reproducible biofilm concentration detection and is simple, compact, and inexpensive. Biofilms originating from various bacterial strains, including Pseudomonas aeruginosa (P. aeruginosa), were tested to demonstrate the efficacy of this new biofilm detection approach. The results were compared with the results obtained from a commercial spectrophotometer. To utilize a cost-effective light source (i.e., an LED) for biofilm detection, the illumination conditions were optimized. For accurate and reproducible biofilm detection, a simple, custom-coded image processing algorithm was developed and applied to a five-megapixel CMOS image sensor, which is a cost-effective detector. The concentration of biofilms formed by P. aeruginosa was detected and quantified by varying the indole concentration, and the results were compared with the results obtained from a commercial spectrophotometer. The correlation value of the results from those two systems was 0.981 (N=9, P <0.01) and the coefficients of variation (CVs) were approximately threefold lower at the CMOS image-sensor platform.

Yeon Hwa Kwak; Junhee Lee; Junghoon Lee; Soo Hwan Kwak; Sangwoo Oh; Se-Hwan Paek; Un-Hwan Ha; Sungkyu Seo

2014-01-01T23:59:59.000Z

79

Design and performances of the Shack-Hartmann sensor within the Active Phasing Experiment  

E-Print Network [OSTI]

Research in the Southern Hemisphere Karl-Schwarzschild-Str. 2, Garching, Germany A BST R A C T The Shack Mirror (ASM) of APE and is composed of two types of microlenses, circular and cylindrical, which give and compare the performances of different kinds of phasing sensors. A segmented mirror will be conjugated

Liske, Jochen

80

Advanced Detector Research - Fabrication and Testing of 3D Active-Edge Silicon Sensors: High Speed, High Yield  

SciTech Connect (OSTI)

Development of 3D silicon radiation sensors employing electrodes fabricated perpendicular to the sensor surfaces to improve fabrication yields and increasing pulse speeds.

Parker, Sherwood I

2008-09-01T23:59:59.000Z

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


81

Testing the quasi-absolute method in photon activation analysis  

SciTech Connect (OSTI)

In photon activation analysis (PAA), relative methods are widely used because of their accuracy and precision. Absolute methods, which are conducted without any assistance from calibration materials, are seldom applied for the difficulty in obtaining photon flux in measurements. This research is an attempt to perform a new absolute approach in PAA - quasi-absolute method - by retrieving photon flux in the sample through Monte Carlo simulation. With simulated photon flux and database of experimental cross sections, it is possible to calculate the concentration of target elements in the sample directly. The QA/QC procedures to solidify the research are discussed in detail. Our results show that the accuracy of the method for certain elements is close to a useful level in practice. Furthermore, the future results from the quasi-absolute method can also serve as a validation technique for experimental data on cross sections. The quasi-absolute method looks promising.

Sun, Z. J. [Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439 (United States); Wells, D. [Physics Department, South Dakota School of Mines and Technology, 501 E. Saint Joseph St. Rapid City, SD 57701 (United States); Starovoitova, V.; Segebade, C. [Idaho Accelerator Center, Idaho State University, 921 S. 8th Ave. Pocatello, ID 83209 (United States)

2013-04-19T23:59:59.000Z

82

Methods of increasing secretion of polypeptides having biological activity  

SciTech Connect (OSTI)

The present invention relates to methods for producing a secreted polypeptide having biological activity, comprising: (a) transforming a fungal host cell with a fusion protein construct encoding a fusion protein, which comprises: (i) a first polynucleotide encoding a signal peptide; (ii) a second polynucleotide encoding at least a catalytic domain of an endoglucanase or a portion thereof; and (iii) a third polynucleotide encoding at least a catalytic domain of a polypeptide having biological activity; wherein the signal peptide and at least the catalytic domain of the endoglucanase increases secretion of the polypeptide having biological activity compared to the absence of at least the catalytic domain of the endoglucanase; (b) cultivating the transformed fungal host cell under conditions suitable for production of the fusion protein; and (c) recovering the fusion protein, a component thereof, or a combination thereof, having biological activity, from the cultivation medium.

Merino, Sandra

2013-10-01T23:59:59.000Z

83

Methods of increasing secretion of polypeptides having biological activity  

DOE Patents [OSTI]

The present invention relates to methods for producing a secreted polypeptide having biological activity, comprising: (a) transforming a fungal host cell with a fusion protein construct encoding a fusion protein, which comprises: (i) a first polynucleotide encoding a signal peptide; (ii) a second polynucleotide encoding at least a catalytic domain of an endoglucanase or a portion thereof; and (iii) a third polynucleotide encoding at least a catalytic domain of a polypeptide having biological activity; wherein the signal peptide and at least the catalytic domain of the endoglucanase increases secretion of the polypeptide having biological activity compared to the absence of at least the catalytic domain of the endoglucanase; (b) cultivating the transformed fungal host cell under conditions suitable for production of the fusion protein; and (c) recovering the fusion protein, a component thereof, or a combination thereof, having biological activity, from the cultivation medium.

Merino, Sandra

2014-10-28T23:59:59.000Z

84

Methods of increasing secretion of polypeptides having biological activity  

DOE Patents [OSTI]

The present invention relates to methods for producing a secreted polypeptide having biological activity, comprising: (a) transforming a fungal host cell with a fusion protein construct encoding a fusion protein, which comprises: (i) a first polynucleotide encoding a signal peptide; (ii) a second polynucleotide encoding at least a catalytic domain of an endoglucanase or a portion thereof; and (iii) a third polynucleotide encoding at least a catalytic domain of a polypeptide having biological activity; wherein the signal peptide and at least the catalytic domain of the endoglucanase increases secretion of the polypeptide having biological activity compared to the absence of at least the catalytic domain of the endoglucanase; (b) cultivating the transformed fungal host cell under conditions suitable for production of the fusion protein; and (c) recovering the fusion protein, a component thereof, or a combination thereof, having biological activity, from the cultivation medium.

Merino, Sandra

2014-05-27T23:59:59.000Z

85

Low Power Camera-on-a-Chip Using CMOS Active Pixel Sensor Technology  

E-Print Network [OSTI]

and scientific markets. The development of the solid-state charge-coupled device (CCD) in the early 1970's led to as a camera-on-a-chip, and represents a second generation solid state image sensor technology. A block diagram systems typically operate for an hour on an 1800 mA-hr 6 Y NiCad rechargeable battery, corresponding to 10

Fossum, Eric R.

86

Non-contact passive temperature measuring system and method of operation using micro-mechanical sensors  

DOE Patents [OSTI]

A non-contact infrared thermometer measures target temperatures remotely without requiring the ratio of the target size to the target distance to the thermometer. A collection means collects and focusses target IR radiation on an IR detector. The detector measures thermal energy of the target over a spectrum using micromechanical sensors. A processor means calculates the collected thermal energy in at least two different spectral regions using a first algorithm in program form and further calculates the ratio of the thermal energy in the at least two different spectral regions to obtain the target temperature independent of the target size, distance to the target and emissivity using a second algorithm in program form.

Thundat, Thomas G. (616 Plainfield Rd., Knoxville, TN 37923); Oden, Patrick I. (804-171 Olde Pioneer Trail, Knoxville, TN 37923); Datskos, Panagiotis G. (8444 Mecklenburg Ct., Knoxville, TN 37923)

2000-01-01T23:59:59.000Z

87

A method of detecting contamination events using multiple conventional water quality sensors  

Science Journals Connector (OSTI)

Early warning systems are often used for detecting contamination accidents. Traditional event detection methods suffer from high false negative and false positive errors. This paper proposes a detection method...

Shuming Liu; Han Che; Kate Smith; Chao Chen

2014-12-01T23:59:59.000Z

88

CHEMICAL SENSOR AND FIELD SCREENING TECHNOLOGY DEVELOPMENT: FUELS IN SOILS FIELD SCREENING METHOD VALIDATION  

SciTech Connect (OSTI)

A new screening method for fuel contamination in soils was recently developed as American Society for Testing and Materials (ASTM) Method D-583 1-95, Standard Test Method for Screening Fuels in Soils. This method uses low-toxicity chemicals and can be used to screen organic-rich soils. In addition, it is fast, easy, and inexpensive to perform. The screening method calls for extracting a sample of soil with isopropyl alcohol following treatment with calcium oxide. The resulting extract is filtered, and the ultraviolet absorbance of the extract is measured at 254 nm. Depending on the available information concerning the contaminant fuel type and availability of the contaminant fuel for calibration, the method can be used to determine the approximate concentration of fuel contamination, an estimated value of fuel contamination, or an indication of the presence or absence of fuel contamination. Fuels containing aromatic compounds, such as diesel fuel and gasoline, as well as other aromatic-containing hydrocarbon materials, such as motor oil, crude oil, and coal oil, can be determined. The screening method for fuels in soils was evaluated by conducting a collaborative study on the method and by using the method to screen soil samples at an actual field site. In the collaborative study, a sand and an organic soil spiked with various concentrations of diesel fuel were tested. Data from the collaborative study were used to determine the reproducibility (between participants) and repeatability (within participant) precision of the method for screening the test materials. The collaborative study data also provide information on the performance of portable field equipment versus laboratory equipment for performing the screening method and a comparison of diesel concentration values determined using the screening method versus a laboratory method. Data generated using the method to screen soil samples in the field provide information on the performance of the method in atypical real-world application.

Susan S. Sorini; John F. Schabron

1997-04-01T23:59:59.000Z

89

Ppb-level QEPAS NO2 sensor by use of electrical modulation cancellation method with a high power blue LED  

Science Journals Connector (OSTI)

Abstract A novel electrical modulation cancellation method (E-MOCAM) is proposed to suppress the background noise in the case of the excitation light source with a poor beam quality. For its practical implementation, an E-MOCAM based on-beam QEPAS NO2 sensor by use of a commercial high-power wide-stripe LED is developed. The E-MOCAM ultimately suppressed the background noise caused by the stray light by three orders of magnitude. A 1? detection limit of 1.3ppb (part per billion by volume) was achieved at 1s integration time in this experiment, which corresponds to a normalized noise equivalent absorption coefficient (NNEA) 4.2נ10?9Wcm?1Hz?1/2. A 9h continuous on-line monitoring of ambient atmospheric NO2 was carried out on the campus of Shanxi University.

Huadan Zheng; Lei Dong; Xukun Yin; Xiaoli Liu; Hongpeng Wu; Lei Zhang; Weiguang Ma; Wangbao Yin; Suotang Jia

2015-01-01T23:59:59.000Z

90

Sensor readout detector circuit  

DOE Patents [OSTI]

A sensor readout detector circuit is disclosed that is capable of detecting sensor signals down to a few nanoamperes or less in a high (microampere) background noise level. The circuit operates at a very low standby power level and is triggerable by a sensor event signal that is above a predetermined threshold level. A plurality of sensor readout detector circuits can be formed on a substrate as an integrated circuit (IC). These circuits can operate to process data from an array of sensors in parallel, with only data from active sensors being processed for digitization and analysis. This allows the IC to operate at a low power level with a high data throughput for the active sensors. The circuit may be used with many different types of sensors, including photodetectors, capacitance sensors, chemically-sensitive sensors or combinations thereof to provide a capability for recording transient events or for recording data for a predetermined period of time following an event trigger. The sensor readout detector circuit has applications for portable or satellite-based sensor systems. 6 figs.

Chu, D.D.; Thelen, D.C. Jr.

1998-08-11T23:59:59.000Z

91

Sensor readout detector circuit  

DOE Patents [OSTI]

A sensor readout detector circuit is disclosed that is capable of detecting sensor signals down to a few nanoamperes or less in a high (microampere) background noise level. The circuit operates at a very low standby power level and is triggerable by a sensor event signal that is above a predetermined threshold level. A plurality of sensor readout detector circuits can be formed on a substrate as an integrated circuit (IC). These circuits can operate to process data from an array of sensors in parallel, with only data from active sensors being processed for digitization and analysis. This allows the IC to operate at a low power level with a high data throughput for the active sensors. The circuit may be used with many different types of sensors, including photodetectors, capacitance sensors, chemically-sensitive sensors or combinations thereof to provide a capability for recording transient events or for recording data for a predetermined period of time following an event trigger. The sensor readout detector circuit has applications for portable or satellite-based sensor systems.

Chu, Dahlon D. (Albuquerque, NM); Thelen, Jr., Donald C. (Bozeman, MT)

1998-01-01T23:59:59.000Z

92

Sensor Network Lifetime Maximization Via Sensor Energy Balancing: Construction and Optimal Scheduling of Sensor Trees  

E-Print Network [OSTI]

in such a way that the total energy usage of the active sensor nodes in the tree is minimized. However whenSensor Network Lifetime Maximization Via Sensor Energy Balancing: Construction and Optimal Scheduling of Sensor Trees Ling Shi , Agostino Capponi , Karl H. Johansson and Richard M. Murray Abstract

Johansson, Karl Henrik

93

Measurements on HV-CMOS Active Sensors After Irradiation to HL-LHC fluences  

E-Print Network [OSTI]

During the long shutdown (LS) 3 beginning 2022 the LHC will be upgraded for higher luminosities pushing the limits especially for the inner tracking detectors of the LHC experiments. In order to cope with the increased particle rate and radiation levels the ATLAS Inner Detector will be completely replaced by a purely silicon based one. Novel sensors based on HV-CMOS processes prove to be good candidates in terms of spatial resolution and radiation hardness. In this paper measurements conducted on prototypes built in the AMS H18 HV-CMOS process and irradiated to fluences of up to $2\\cdot10^{16}\\,\\text{n}_\\text{eq}\\text{cm}^{-2}$ are presented.

B. Ristic; for the ATLAS CMOS pixel collaboration

2015-01-13T23:59:59.000Z

94

DAMAGE DETECTION METHODS ON WIND TURBINE BLADE TESTING WITH WIRED AND WIRELESS ACCELEROMETER SENSORS  

E-Print Network [OSTI]

DAMAGE DETECTION METHODS ON WIND TURBINE BLADE TESTING WITH WIRED AND WIRELESS ACCELEROMETER for nonstationary blade excitations. KEYWORDS : Structural Health Monitoring, Damage Detection, Wind Turbine, Wireless sensing, Wavelets. INTRODUCTION Detecting damage in wind turbine blades is a very

Paris-Sud XI, Université de

95

Method using photo-induced and thermal bending of MEMS sensors  

DOE Patents [OSTI]

A method for measuring chemical analytes and physical forces by measuring changes in the deflection of a microelectromechanical cantilever structure while it is being irradiated by a light having an energy above the band gap of the structure.

Datskos, Panagiotis G. (Knoxville, TN)

2001-01-01T23:59:59.000Z

96

Triboelectric Nanogenerators as New Energy Technology for Self-Powered Systems and as Active Mechanical and Chemical Sensors  

Science Journals Connector (OSTI)

Triboelectric Nanogenerators as New Energy Technology for Self-Powered Systems and as Active Mechanical and Chemical Sensors ... As for this power generation unit, in the inner circuit, a potential is created by the triboelectric effect due to the charge transfer between two thin organic/inorganic films that exhibit opposite tribo-polarity; in the outer circuit, electrons are driven to flow between two electrodes attached on the back sides of the films in order to balance the potential. ... The TENG can be applied to harvest all kinds of mechanical energy that is available but wasted in our daily life, such as human motion, walking, vibration, mechanical triggering, rotating tire, wind, flowing water, and more. ...

Zhong Lin Wang

2013-09-30T23:59:59.000Z

97

Compositions and methods for adoptive and active immunotherapy  

DOE Patents [OSTI]

Modular aAPCs and methods of their manufacture and use are provided. The modular aAPCs are constructed from polymeric microparticles. The aAPCs include encapsulated cytokines and coupling agents which modularly couple functional elements including T cell receptor activators, co-stimulatory molecules and adhesion molecules to the particle. The ability of these aAPCs to release cytokines in a controlled manner, coupled with their modular nature and ease of ligand attachment, results in an ideal, tunable APC capable of stimulating and expanding primary T cells.

Fahmy, Tarek; Steenblock, Erin

2014-01-14T23:59:59.000Z

98

MINIMIZATION OF SENSOR USAGE FOR TARGET TRACKING IN A NETWORK OF IRREGULARLY SPACED SENSORS  

E-Print Network [OSTI]

MINIMIZATION OF SENSOR USAGE FOR TARGET TRACKING IN A NETWORK OF IRREGULARLY SPACED SENSORS Thomas address the following scenario: a single target moves through a field of stationary sensors with known locations. At each time epoch, each sensor is either active or not; each active sensor outputs either target

Morrell, Darryl

99

Sensors, Electronics & Instrumentation  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sensors, Electronics & Instrumentation Sensors, Electronics & Instrumentation Sensors, Electronics & Instrumentation Express Licensing Acoustic Concentration Of Particles In Fluid Flow Express Licensing Apparatus And Method For Hydrogen And Oxygen Mass Spectrometry Of The Terrestrial Magnetosphere Express Licensing Apparatus And Method For Temperature Correction And Expanded Count Rate Of Inorganic Scintillation Detectors Express Licensing Composition and method for removing photoresist materials from electronic components Express Licensing Corrosion Test Cell For Bipolar Plates Express Licensing Cylindrical Acoustic Levitator/Concentrator Negotiable Licensing Electrochemical Apparatus with Disposable and Modifiable Parts Express Licensing Foil electron multiplier Express Licensing Hydrogen Sensor

100

a Wireless Sensor Network for Environmental Monitoring  

E-Print Network [OSTI]

transmitters #12;Sample sensors: #12;Sample sensors: PAR: Photosynthetically Active (solar) Radiation sensora Wireless Sensor Network for Environmental Monitoring a Wireless Sensor Network for Environmental technology: a truly self configurable, low-cost, maintenance-free, ad-hoc sensor network (not based on Zig

Gburzynski, Pawel

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


101

Platforms: Where the sensors are mounted.  

E-Print Network [OSTI]

over the Sahara On September 18, 1994. #12;14 The sensor detects solar radiation that has been absorbed1 Platforms: Where the sensors are mounted. Sensors: Instruments on the platforms. ETM+ AVIRIS GER 1500 #12;2 Passive Sensors · Aerial Cameras · Visible or Thermal Active Sensors · Microwave (Radar

Gilbes, Fernando

102

EAR: An Energy and Activity-Aware Routing Protocol for Wireless Sensor Networks in Smart Environments  

Science Journals Connector (OSTI)

......corresponding node energy consumption. Through observation...clear that the node energy consumption (thus node operations...present a novel Energy and Activity aware...such as Smart Home [1, 2], Smart...shows the daylong average triggering rate......

Debraj De; Wen-Zhan Song; Shaojie Tang; Diane Cook

2012-12-01T23:59:59.000Z

103

Mitigating container security risk using real-time monitoring with active Radio Frequency Identification and sensors  

E-Print Network [OSTI]

The global village in which we live enables increased trade and commerce across regions but also brings a complicated new set of challenges such as terrorist activity, human and drug smuggling and theft in foreign or ...

Schlesinger, Adam Ian

2005-01-01T23:59:59.000Z

104

Fault-tolerant control for current sensors of doubly fed induction generators based on an improved fault detection method  

Science Journals Connector (OSTI)

Abstract Fault-tolerant control of current sensors is studied in this paper to improve the reliability of a doubly fed induction generator (DFIG). A fault-tolerant control system of current sensors is presented for the DFIG, which consists of a new current observer and an improved current sensor fault detection algorithm. The current observer is constructed by using only voltage signals as inputs. The fault detection algorithm is based on the current observer, in which an adaptive threshold and different fault duration times are considered. The performance of the proposed observer, improved fault detection algorithm, and fault-tolerant control system are investigated by simulation. The results indicate that the outputs of the observer and the sensor are highly coherent. The fault detection algorithm can efficiently detect both soft and hard faults in current sensors, and the fault-tolerant control system can effectively tolerate both types of faults.

H. Li; C. Yang; Y.G. Hu; B. Zhao; M. Zhao; Z. Chen

2014-01-01T23:59:59.000Z

105

Multi-mode Damage Detection Methods with Piezoelectric Wafer Active Sensors  

E-Print Network [OSTI]

modes structural health monitoring (SHM) and non- destructive evaluation (NDE) simply by changing the driving frequencies. This paper presents research results obtained by using PWAS transducer for SHM/NDE impedance measurements; (3) PWAS ultrasonic SHM/NDE; and (4) PWAS multi-mode corrosion detection

Giurgiutiu, Victor

106

ActSee: Activity-Aware Radio Duty-Cycling for Sensor Networks in Smart Environments  

E-Print Network [OSTI]

, energy consumption, linear programming, smart environment, smart home. I. INTRODUCTION Fig. 1. Change and maximize through- put, while still conserving energy in the network. Based on the collected intelligence study we have evaluated ActSee using the activity pattern information from real Smart Home testbed CASAS

Cook, Diane J.

107

E-Print Network 3.0 - activity optimization method Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

optimization method Search Powered by Explorit Topic List Advanced Search Sample search results for: activity optimization method Page: << < 1 2 3 4 5 > >> 1 Optimization 1-1...

108

Title: Structural Health Monitoring with Piezoelectric Wafer Active Sensors Author: Victor Giurgiutiu  

E-Print Network [OSTI]

on the piezoelectric principle by coupling the electrical and mechanical energy fields (Figure 1). For embedded NDE. Embedded ultrasonic NDE is achieved by using the pitch-catch, pulse-echo, and phased-array NDE methods with in-situ PWAS transducers. A comprehensive study of the state of the art in embedded ultrasonic NDE

Giurgiutiu, Victor

109

Disbond detection in adhesively-bonded structures using piezoelectric wafer active sensors  

E-Print Network [OSTI]

, Structural Health Monitoring, Damage Detection, NDE 1 INTRODUCTION With an increasing use of adhesively in this direction and nondestructive evaluation (NDE) methods are successfully used for damage detection and damage, guided waves used for NDE have shown encouraging results and are becoming more popular in the NDE field

Giurgiutiu, Victor

110

Contact stress sensor  

DOE Patents [OSTI]

A method for producing a contact stress sensor that includes one or more MEMS fabricated sensor elements, where each sensor element of includes a thin non-recessed portion, a recessed portion and a pressure sensitive element adjacent to the recessed portion. An electric circuit is connected to the pressure sensitive element. The circuit includes a pressure signal circuit element configured to provide a signal upon movement of the pressure sensitive element.

Kotovsky, Jack

2014-02-11T23:59:59.000Z

111

Portable room-temperature self-powered/active H2 sensor driven by human motion through piezoelectric screening effect  

Science Journals Connector (OSTI)

Abstract Room-temperature high H2 sensing has been realized from SnO2/ZnO nanoarray nanogenerator. Without any external electricity power source, the portable device can be self-powered under the driving of human motion, in which the piezoelectric output can actively act as both the power source and H2 sensing signal. Upon exposure to 800ppm H2 at room temperature, the piezoelectric output voltage of the device under the same applied deformation decreases from 0.80V (in dry air) to 0.14V, and the sensitivity is up to 471.4. The detection limit is ~10ppm H2, and the selectivity against H2 at room temperature is very high. The excellent room-temperature H2 sensing performance can be attributed to the coupling of the piezoelectric screening effect of ZnO nanowires and the conversion of SnO2/ZnO heterojunctions. This study can stimulate a research trend for the development of the next generation of portable room-temperature H2 sensors.

Yongming Fu; Weili Zang; Penglei Wang; Lili Xing; Xinyu Xue; Yan Zhang

2014-01-01T23:59:59.000Z

112

Pt/ZnO nanoarray nanogenerator as self-powered active gas sensor with linear ethanol sensing at room temperature  

Science Journals Connector (OSTI)

A self-powered gas sensor that can actively detect ethanol at room temperature has been realized from a Pt/ZnO nanoarray nanogenerator. Pt nanoparticles are uniformly distributed on the whole surface of ZnO nanowires. The piezoelectric output of Pt/ZnO nanoarrays can act not only as a power source, but also as a response signal to ethanol at room temperature. Upon exposure to dry air and 1500ppm ethanol at room temperature, the piezoelectric output of the device under the same compressive strain is 0.672 and 0.419V, respectively. Moreover, a linear dependence of the sensitivity on the ethanol concentration is observed. Such a linear ethanol sensing at room temperature can be attributed to the atmosphere-dependent variety of the screen effect on the piezoelectric output of ZnO nanowires, the catalytic properties of Pt nanoparticles, and the Schottky barriers at Pt/ZnO interfaces. The present results can stimulate research in the direction of designing new material systems for self-powered room-temperature gas sensing.

Yayu Zhao; Xuan Lai; Ping Deng; Yuxin Nie; Yan Zhang; Lili Xing; Xinyu Xue

2014-01-01T23:59:59.000Z

113

Passive Sensors | Open Energy Information  

Open Energy Info (EERE)

Passive Sensors Passive Sensors Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Passive Sensors Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Remote Sensing Techniques Exploration Sub Group: Passive Sensors Parent Exploration Technique: Remote Sensing Techniques Information Provided by Technique Lithology: Mineral maps can be used to show the presence of hydrothermal minerals and mineral assemblages Stratigraphic/Structural: Map structures/faults and regional strain rates Hydrological: Map surface water features Thermal: Map surface temperatures Dictionary.png Passive Sensors: Sensors that measure energy which is naturally available in the environment. Other definitions:Wikipedia Reegle

114

Auto-calibration of accelerometer data for free-living physical activity assessment using local gravity and temperature: an evaluation on four continents  

E-Print Network [OSTI]

Background: Wearable acceleration sensors are increasingly used for the assessment of free-living physical activity. Acceleration sensor calibration is a potential source of error. This study aims to describe and evaluate an auto-calibration method...

van Hees, Vincent Theodoor; Fang, Zhou; Langford, Joss; Assah, Felix; Mohammad, Anwar; da Silva, Inacio C. M.; Trenell, Michael I.; White, Tom; Wareham, Nicholas J.; Brage, Sren

2014-08-07T23:59:59.000Z

115

Building Technologies Office: Sensors and Controls Research  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sensors and Controls Sensors and Controls Research to someone by E-mail Share Building Technologies Office: Sensors and Controls Research on Facebook Tweet about Building Technologies Office: Sensors and Controls Research on Twitter Bookmark Building Technologies Office: Sensors and Controls Research on Google Bookmark Building Technologies Office: Sensors and Controls Research on Delicious Rank Building Technologies Office: Sensors and Controls Research on Digg Find More places to share Building Technologies Office: Sensors and Controls Research on AddThis.com... About Take Action to Save Energy Partner with DOE Activities Appliances Research Building Envelope Research Windows, Skylights, & Doors Research Space Heating & Cooling Research Water Heating Research Lighting Research

116

Sensor network algorithms and applications  

Science Journals Connector (OSTI)

...range-based localization methods for wireless sensor networks. They review...compression techniques for wireless sensor networks. They pay...consuming hundreds of megawatts of electricity. Careful monitoring of large...of the state of the art in wireless sensor networks. The articles...

2012-01-01T23:59:59.000Z

117

Sandia National Laboratories: Sensors  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sensors Sensors Sandia's Microsensor and Sensor Microsystem effort develops sensors and sensor arrays for chemical, physical, and biological detection Custom Solutions Microsensors...

118

PRECONDITIONING OF ACTIVE-SET NEWTON METHODS FOR ...  

E-Print Network [OSTI]

Dec 12, 2014 ... SF = LM?1L + ??1M. (3.5). Note that the preconditioner PBT does not depend on the nonlinear iteration k, and therefore on the current active...

2014-12-12T23:59:59.000Z

119

System and method for collisional activation of charged particles  

DOE Patents [OSTI]

A collision cell is disclosed that provides ion activation in various selective modes. Ion activation is performed inside selected segments of a segmented quadrupole that provides maximum optimum capture and collection of fragmentation products. The invention provides collisional cooling of precursor ions as well as product fragments and further allows effective transmission of ions through a high pressure interface into a coupled mass analysis instrument.

Ibrahim, Yehia M; Belov, Mikhail E; Prior, David C

2013-09-24T23:59:59.000Z

120

Optimization of the multivariate calibration of a VisNIR sensor for the on-line monitoring of marine diesel engine lubricating oil by variable selection methods  

Science Journals Connector (OSTI)

Abstract This paper deals with the description of the optimization by variable selection methods of the multivariate calibration process of a low-cost VisibleNear Infrared (4001100nm) sensor, developed for the on-line monitoring of the insoluble content in diesel marine engine lubricating oil. The performance of the calibration model developed for the VisNIR sensor was compared with the performance of the calibration model developed with spectra obtained with a UV/VisNIR laboratory spectrometer. The calibration results obtained with the two devices were compared to determine the limitations of the sensor system with respect to the laboratory equipment. First, the spectra were correlated with the insoluble content analyzed in Wearcheckiberica's oil laboratories obtaining a calibration model based on Partial Least Squares-regression (PLSR). Once the pre-processing strategy had been defined, the most significant predictor variables were chosen with the help of Martens uncertainty test, interval Partial Least Squares (iPLS) and Genetic Algorithms (GA) variable selection techniques. Finally, the two models were compared based on the number of latent variables of each model of the values of the Root Mean Square Error of the Cross Validation (RMSECV), the Standard Error of Performance (SECV) and the Ratio of Prediction to Deviation (RPD).

Alberto Villar; Santiago Fernndez; Eneko Gorritxategi; Jos I. Ciria; Luis A. Fernndez

2014-01-01T23:59:59.000Z

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


121

Activated carbon fiber composite material and method of making  

DOE Patents [OSTI]

An activated carbon fiber composite for separation and purification, or catalytic processing of fluids is described. The activated composite comprises carbon fibers rigidly bonded to form an open, permeable, rigid monolith capable of being formed to near-net-shape. Separation and purification of gases are effected by means of a controlled pore structure that is developed in the carbon fibers contained in the composite. The open, permeable structure allows the free flow of gases through the monolith accompanied by high rates of adsorption. By modification of the pore structure and bulk density the composite can be rendered suitable for applications such as gas storage, catalysis, and liquid phase processing.

Burchell, Timothy D. (Oak Ridge, TN); Weaver, Charles E. (Knoxville, TN); Chilcoat, Bill R. (Knoxville, TN); Derbyshire, Frank (Lexington, KY); Jagtoyen, Marit (Lexington, KY)

2001-01-01T23:59:59.000Z

122

Activated carbon fiber composite material and method of making  

DOE Patents [OSTI]

An activated carbon fiber composite for separation and purification, or catalytic processing of fluids is described. The activated composite comprises carbon fibers rigidly bonded to form an open, permeable, rigid monolith capable of being formed to near-net-shape. Separation and purification of gases are effected by means of a controlled pore structure that is developed in the carbon fibers contained in the composite. The open, permeable structure allows the free flow of gases through the monolith accompanied by high rates of adsorption. By modification of the pore structure and bulk density the composite can be rendered suitable for applications such as gas storage, catalysis, and liquid phase processing.

Burchell, Timothy D. (Oak Ridge, TN); Weaver, Charles E. (Knoxville, TN); Chilcoat, Bill R. (Knoxville, TN); Derbyshire, Frank (Lexington, KY); Jagtoyen, Marit (Lexington, KY)

2000-01-01T23:59:59.000Z

123

4 - Mobile Robot Sensors  

Science Journals Connector (OSTI)

The use of sensors is of paramount importance for closing the feedback control loops that secure efficient and automated/autonomous operation of mobile robots in real-life applications. Sensing methods provide higher level and intelligence capabilities that go far beyond the preprogrammed style of operation. This chapter provides a conceptual introduction to a number of important sensors for mobile robot operation and control. Specifically, the objectives of the chapter are (i) to provide a popular classification of sensors, along with their operational features, (ii) to discuss sonar, laser, and infrared sensors, (iii) to present an outline of robotic vision and its principal functions (including omnidirectional vision), (iv) to list the operation principles of gyroscope, compass, and force/tactile sensors, and (v) to give a brief introduction to the global positioning system.

Spyros G. Tzafestas

2014-01-01T23:59:59.000Z

124

RADIOACTIVE MATERIALS SENSORS  

SciTech Connect (OSTI)

Providing technical means to detect, prevent, and reverse the threat of potential illicit use of radiological or nuclear materials is among the greatest challenges facing contemporary science and technology. In this short article, we provide brief description and overview of the state-of-the-art in sensor development for the detection of radioactive materials, as well as an identification of the technical needs and challenges faced by the detection community. We begin with a discussion of gamma-ray and neutron detectors and spectrometers, followed by a description of imaging sensors, active interrogation, and materials development, before closing with a brief discussion of the unique challenges posed in fielding sensor systems.

Mayo, Robert M.; Stephens, Daniel L.

2009-09-15T23:59:59.000Z

125

Sensor Relocation with Mobile Sensors:Sensor Relocation with Mobile Sensors: Design,Design,  

E-Print Network [OSTI]

Sensor Relocation with Mobile Sensors:Sensor Relocation with Mobile Sensors: Design of Freiburg #12;OverviewOverview · Sensor networks · mobile sensor · mobile robot · Mote · sensor relocation #12;Sensor networks · A wirless network . · Set of sensors. · Static Mote #12;Mobile sensor networks

Schindelhauer, Christian

126

Critical Analysis of Active Shielding Methods for Space Radiation Protection  

E-Print Network [OSTI]

are reviewed and critiqued. Advantages and disadvantages of the proposed methods will be presented harmful space radiations. Designs affording protection from either solar energetic particle event protons for deep space missions are sporadic solar energetic particle events (SPEs) and the ever-present Galactic

Shepherd, Simon

127

Abstract--A low noise optical sensor and biocompatible microscale optical filters for integrated fluorescence sensors  

E-Print Network [OSTI]

Abstract--A low noise optical sensor and biocompatible microscale optical filters for integrated fluorescence sensors were developed and tested. The sensor was fabricated in a 0.5 µm CMOS process. The measured reset noise of the sensor is reduced by a factor of 10 compared to conventional active pixel

Maryland at College Park, University of

128

A method for activation analysis of ruthenium in sea water  

E-Print Network [OSTI]

of these isotopes in the marine environment, it is essential that a method for the analysis of trace amounts of stable ruthenium be developed, and applied to the study of the chemical and physical dis- tribution of ruthenium in sea water, marine biota... 100 27. 2 82 34. 8 100 30. 2 91 30. 6 92 26. 9 81 8 (Tracer Only) 34. 5 100 Standard 33. 3 Average Counting time ? Eorty minutes 103 Tracer ? Ru 93 Stable ruthenium added ? 0. Z6 ug 14 TABLE 4 Nuclear Data for Ruthenium Isotope Per Cent...

Dixon, Bryan William

2012-06-07T23:59:59.000Z

129

Active doublet method for measuring small changes in physical properties  

DOE Patents [OSTI]

Small changes in material properties of a work piece are detected by measuring small changes in elastic wave velocity and attenuation within a work piece. Active, repeatable source generate coda wave responses from a work piece, where the coda wave responses are temporally displaced. By analyzing progressive relative phase and amplitude changes between the coda wave responses as a function of elapsed time, accurate determinations of velocity and attenuation changes are made. Thus, a small change in velocity occurring within a sample region during the time periods between excitation origin times (herein called "doublets") will produce a relative delay that changes with elapsed time over some portion of the scattered waves. This trend of changing delay is easier to detect than an isolated delay based on a single arrival and provides a direct measure of elastic wave velocity changes arising from changed material properties of the work piece.

Roberts, Peter M. (Los Alamos, NM); Fehler, Michael C. (Los Alamos, NM); Johnson, Paul A. (Santa Fe, NM); Phillips, W. Scott (Santa Fe, NM)

1994-01-01T23:59:59.000Z

130

Nuclear sensor signal processing circuit  

DOE Patents [OSTI]

An apparatus and method are disclosed for a compact and temperature-insensitive nuclear sensor that can be calibrated with a non-hazardous radioactive sample. The nuclear sensor includes a gamma ray sensor that generates tail pulses from radioactive samples. An analog conditioning circuit conditions the tail-pulse signals from the gamma ray sensor, and a tail-pulse simulator circuit generates a plurality of simulated tail-pulse signals. A computer system processes the tail pulses from the gamma ray sensor and the simulated tail pulses from the tail-pulse simulator circuit. The nuclear sensor is calibrated under the control of the computer. The offset is adjusted using the simulated tail pulses. Since the offset is set to zero or near zero, the sensor gain can be adjusted with a non-hazardous radioactive source such as, for example, naturally occurring radiation and potassium chloride.

Kallenbach, Gene A. (Bosque Farms, NM); Noda, Frank T. (Albuquerque, NM); Mitchell, Dean J. (Tijeras, NM); Etzkin, Joshua L. (Albuquerque, NM)

2007-02-20T23:59:59.000Z

131

The fast neutron fluence and the activation detector activity calculations using the effective source method and the adjoint function  

SciTech Connect (OSTI)

This paper describes the application of effective source in forward calculations and the adjoint method to the solution of fast neutron fluence and activation detector activities in the reactor pressure vessel (RPV) and RPV cavity of a VVER-440 reactor. Its objective is the demonstration of both methods on a practical task. The effective source method applies the Boltzmann transport operator to time integrated source data in order to obtain neutron fluence and detector activities. By weighting the source data by time dependent decay of the detector activity, the result of the calculation is the detector activity. Alternatively, if the weighting is uniform with respect to time, the result is the fluence. The approach works because of the inherent linearity of radiation transport in non-multiplying time-invariant media. Integrated in this way, the source data are referred to as the effective source. The effective source in the forward calculations method thereby enables the analyst to replace numerous intensive transport calculations with a single transport calculation in which the time dependence and magnitude of the source are correctly represented. In this work, the effective source method has been expanded slightly in the following way: neutron source data were performed with few group method calculation using the active core calculation code MOBY-DICK. The follow-up neutron transport calculation was performed using the neutron transport code TORT to perform multigroup calculations. For comparison, an alternative method of calculation has been used based upon adjoint functions of the Boltzmann transport equation. Calculation of the three-dimensional (3-D) adjoint function for each required computational outcome has been obtained using the deterministic code TORT and the cross section library BGL440. Adjoint functions appropriate to the required fast neutron flux density and neutron reaction rates have been calculated for several significant points within the RPV and RPV cavity of the VVER-440 reacto rand located axially at the position of maximum power and at the position of the weld. Both of these methods (the effective source and the adjoint function) are briefly described in the present paper. The paper also describes their application to the solution of fast neutron fluence and detectors activities for the VVER-440 reactor. (authors)

Hep, J.; Konecna, A.; Krysl, V.; Smutny, V. [Calculation Dept., Skoda JS plc, Orlik 266, 31606 Plzen (Czech Republic)

2011-07-01T23:59:59.000Z

132

U-018: Oracle AutoVue ActiveX Control Insecure Method Vulnerabilities |  

Broader source: Energy.gov (indexed) [DOE]

18: Oracle AutoVue ActiveX Control Insecure Method 18: Oracle AutoVue ActiveX Control Insecure Method Vulnerabilities U-018: Oracle AutoVue ActiveX Control Insecure Method Vulnerabilities October 25, 2011 - 8:45am Addthis PROBLEM: Oracle AutoVue ActiveX Control Insecure Method Vulnerabilities. PLATFORM: The vulnerabilities are confirmed in version 20.0.2 build 7910 (AutoVueX.ocx 20.1.1.7910). Other versions may also be affected. ABSTRACT: Successful exploitation of the vulnerabilities allows execution of arbitrary code. reference LINKS: Bugtraq ID: 50321 Secunia Advisory SA46473 Oracle AutoVue IMPACT ASSESSMENT: High Discussion: Successfully exploiting this issue will allow attackers to create or overwrite arbitrary files on the victim's computer within the context of the affected application (typically Internet Explorer) that uses the

133

Review of Methods to Map Peoples Daily Activity Application for Smart Homes  

Science Journals Connector (OSTI)

Peoples daily activity in their home has widespread implications, including health and energy ... the winter of 2012. Within a smart home, these methods could potentially be used to...

Stephanie Gauthier; David Shipworth

2013-01-01T23:59:59.000Z

134

Stellar activity as noise in exoplanet detection I. Methods and application to solar-like stars and activity cycles  

E-Print Network [OSTI]

The detection of exoplanets using any method is prone to confusion due to the intrinsic variability of the host star. We investigate the effect of cool starspots on the detectability of the exoplanets around solar-like stars using the radial velocity method. For investigating this activity-caused "jitter" we calculate synthetic spectra using radiative transfer, known stellar atomic and molecular lines, different surface spot configurations, and an added planetary signal. Here, the methods are described in detail, tested and compared to previously published studies. The methods are also applied to investigate the activity jitter in old and young solar-like stars, and over a solar-like activity cycles. We find that the mean full jitter amplitude obtained from the spot surfaces mimicking the solar activity varies during the cycle approximately between 1 m/s and 9 m/s. With a realistic observing frequency a Neptune mass planet on a one year orbit can be reliably recovered. On the other hand, the recovery of an Ea...

Korhonen, H; Piskunov, N; Hackman, T; Juncher, D; Jarvinen, S P; Joergensen, U G

2015-01-01T23:59:59.000Z

135

System and method for coproduction of activated carbon and steam/electricity  

DOE Patents [OSTI]

A system and method for producing activated carbon comprising carbonizing a solid carbonaceous material in a carbonization zone of an activated carbon production apparatus (ACPA) to yield a carbonized product and carbonization product gases, the carbonization zone comprising carbonaceous material inlet, char outlet and carbonization gas outlet; activating the carbonized product via activation with steam in an activation zone of the ACPA to yield activated carbon and activation product gases, the activation zone comprising activated carbon outlet, activation gas outlet, and activation steam inlet; and utilizing process gas comprising at least a portion of the carbonization product gases or a combustion product thereof; at least a portion of the activation product gases or a combustion product thereof; or a combination thereof in a solid fuel boiler system that burns a solid fuel boiler feed with air to produce boiler-produced steam and flue gas, the boiler upstream of an air heater within a steam/electricity generation plant, said boiler comprising a combustion zone, a boiler-produced steam outlet and at least one flue gas outlet.

Srinivasachar, Srivats (Sturbridge, MA); Benson, Steven (Grand Forks, ND); Crocker, Charlene (Newfolden, MN); Mackenzie, Jill (Carmel, IN)

2011-07-19T23:59:59.000Z

136

Method for improved selectivity in photo-activation and detection of molecular diagnostic agents  

DOE Patents [OSTI]

A method for the imaging of a particular volume of plant or animal tissue, wherein the plant or animal tissue contains at least one photo-active molecular agent. The method includes the steps of treating the particular volume of the plant or animal tissue with light sufficient to promote a simultaneous two-photon excitation of the photo-active molecular agent contained in the particular volume of the plant or animal tissue, photo-activating at least one of the at least one photo-active molecular agent in the particular volume of the plant or animal tissue, thereby producing at least one photo-activated molecular agent, wherein the at least one photo-activated molecular agent emits energy, detecting the energy emitted by the at least one photo-activated molecular agent, and producing a detected energy signal which is characteristic of the particular volume of plant or animal tissue. The present invention is also a method for the imaging of a particular volume of material, wherein the material contains at least one photo-active molecular agent.

Wachter, Eric A. (Oak Ridge, TN); Fisher, Walter G. (Knoxville, TN); Dees, H. Craig (Knoxville, TN)

1998-01-01T23:59:59.000Z

137

Methods for improved selectivity in photo-activation and detection of molecular diagnostic agents  

SciTech Connect (OSTI)

A method for the imaging of a particular volume of plant or animal tissue, wherein the plant or animal tissue contains at least one photo-active molecular agent. The method comprises the steps of treating the particular volume of the plant or animal tissue with light sufficient to promote a simultaneous two-photon excitation of the photo-active molecular agent contained in the particular volume of the plant or animal tissue, photo-activating at least one of the at least one photo-active molecular agent in the particular volume of the plant or animal tissue, thereby producing at least one photo-activated molecular agent, wherein the at least one photo-activated molecular agent emits energy, detecting the energy emitted by the at least one photo-activated molecular agent, and producing a detected energy signal which is characteristic of the particular volume of plant or animal tissue. The present invention also provides a method for the imaging of a particular volume of material, wherein the material contains at least one photo-active molecular agent.

Wachter, Eric A. (Oak Ridge, TN); Fisher, Walter G. (Knoxville, TN); Dees, H. Craig (Knoxville, TN)

2008-03-18T23:59:59.000Z

138

Distributed Sensor Coordination for Advanced Energy Systems  

SciTech Connect (OSTI)

The ability to collect key system level information is critical to the safe, efficient and reli- able operation of advanced energy systems. With recent advances in sensor development, it is now possible to push some level of decision making directly to computationally sophisticated sensors, rather than wait for data to arrive to a massive centralized location before a decision is made. This type of approach relies on networked sensors (called agents from here on) to actively collect and process data, and provide key control deci- sions to significantly improve both the quality/relevance of the collected data and the as- sociating decision making. The technological bottlenecks for such sensor networks stem from a lack of mathematics and algorithms to manage the systems, rather than difficulties associated with building and deploying them. Indeed, traditional sensor coordination strategies do not provide adequate solutions for this problem. Passive data collection methods (e.g., large sensor webs) can scale to large systems, but are generally not suited to highly dynamic environments, such as ad- vanced energy systems, where crucial decisions may need to be reached quickly and lo- cally. Approaches based on local decisions on the other hand cannot guarantee that each agent performing its task (maximize an agent objective) will lead to good network wide solution (maximize a network objective) without invoking cumbersome coordination rou- tines. There is currently a lack of algorithms that will enable self-organization and blend the efficiency of local decision making with the system level guarantees of global decision making, particularly when the systems operate in dynamic and stochastic environments. In this work we addressed this critical gap and provided a comprehensive solution to the problem of sensor coordination to ensure the safe, reliable, and robust operation of advanced energy systems. The differentiating aspect of the proposed work is in shift- ing the focus towards what to observe rather than how to observe in large sensor networks, allowing the agents to actively determine both the structure of the network and the relevance of the information they are seeking to collect. In addition to providing an implicit coordination mechanism, this approach allows the system to be reconfigured in response to changing needs (e.g., sudden external events requiring new responses) or changing sensor network characteristics (e.g., sudden changes to plant condition). Outcome Summary: All milestones associated with this project have been completed. In particular, private sensor objective functions were developed which are aligned with the global objective function, sensor effectiveness has been improved by using sensor teams, system efficiency has been improved by 30% using difference evaluation func- tions, we have demonstrated system reconfigurability for 20% changes in system con- ditions, we have demonstrated extreme scalability of our proposed algorithm, we have demonstrated that sensor networks can overcome disruptions of up to 20% in network conditions, and have demonstrated system reconfigurability to 20% changes in system conditions in hardware-based simulations. This final report summarizes how each of these milestones was achieved, and gives insight into future research possibilities past the work which has been completed. The following publications support these milestones [6, 8, 9, 10, 16, 18, 19].

Tumer, Kagan

2013-07-31T23:59:59.000Z

139

Method and apparatus for actively controlling a micro-scale flexural plate wave device  

DOE Patents [OSTI]

An actively controlled flexural plate wave device provides a micro-scale pump. A method of actively controlling a flexural plate wave device produces traveling waves in the device by coordinating the interaction of a magnetic field with actively controlled currents. An actively-controlled flexural plate wave device can be placed in a fluid channel and adapted for use as a micro-scale fluid pump to cool or drive micro-scale systems, for example, micro-chips, micro-electrical-mechanical devices, micro-fluid circuits, or micro-scale chemical analysis devices.

Dohner, Jeffrey L. (Albuquerque, NM)

2001-01-01T23:59:59.000Z

140

Evaluation of magnetic flux distribution from magnetic domains in [Co/Pd] nanowires by magnetic domain scope method using contact-scanning of tunneling magnetoresistive sensor  

SciTech Connect (OSTI)

Current-driven magnetic domain wall motions in magnetic nanowires have attracted great interests for physical studies and engineering applications. The magnetic force microscope (MFM) is widely used for indirect verification of domain locations in nanowires, where relative magnetic force between the local domains and the MFM probe is used for detection. However, there is an occasional problem that the magnetic moments of MFM probe influenced and/or rotated the magnetic states in the low-moment nanowires. To solve this issue, the magnetic domain scope for wide area with nano-order resolution (nano-MDS) method has been proposed recently that could detect the magnetic flux distribution from the specimen directly by scanning of tunneling magnetoresistive field sensor. In this study, magnetic domain structure in nanowires was investigated by both MFM and nano-MDS, and the leakage magnetic flux density from the nanowires was measured quantitatively by nano-MDS. Specimen nanowires consisted from [Co (0.3)/Pd (1.2)]{sub 21}/Ru(3) films (units in nm) with perpendicular magnetic anisotropy were fabricated onto Si substrates by dual ion beam sputtering and e-beam lithography. The length and the width of the fabricated nanowires are 20??m and 150?nm. We have succeeded to obtain not only the remanent domain images with the detection of up and down magnetizations as similar as those by MFM but also magnetic flux density distribution from nanowires directly by nano-MDS. The obtained value of maximum leakage magnetic flux by nano-MDS is in good agreement with that of coercivity by magneto-optical Kerr effect microscopy. By changing the protective diamond-like-carbon film thickness on tunneling magnetoresistive sensor, the three-dimensional spatial distribution of leakage magnetic flux could be evaluated.

Okuda, Mitsunobu, E-mail: okuda.m-ky@nhk.or.jp; Miyamoto, Yasuyoshi; Miyashita, Eiichi; Hayashi, Naoto [NHK Science and Technology Research Laboratories, 1-10-11 Kinuta Setagaya, Tokyo 157-8510 (Japan)

2014-05-07T23:59:59.000Z

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


141

Non-parametric geodesic active regions: Method and evaluation for cerebral aneurysms segmentation in 3DRA and CTA  

E-Print Network [OSTI]

Non-parametric geodesic active regions: Method and evaluation for cerebral aneurysms segmentation compares to other alternative techniques based on deformable models, namely parametric geodesic active aneurysm; Geodesic active regions; Differential invariants; Non-parametric probability estimation; Model

Frangi, Alejandro

142

A wireless sensor tag platform for container security and integrity  

SciTech Connect (OSTI)

Cargo containers onboard ships are widely used in the global supply chain. The need for container security is evidenced by the Container Security Initiative launched by the U.S. Bureau of Customs and Border Protection (CBP). One method of monitoring cargo containers is using low power wireless sensor tags. The wireless sensor tags are used to set up a network that is comprised of tags internal to the container and a central device. The sensor network reports alarms and other anomalies to a central device, which then relays the message to an outside network upon arrival at the destination port. This allows the port authorities to have knowledge of potential security or integrity issues before physically examining the container. Challenges of using wireless sensor tag networks for container security include battery life, size, environmental conditions, information security, and cost among others. PNNL developed an active wireless sensor tag platform capable of reporting data wirelessly to a central node as well as logging data to nonvolatile memory. The tags, operate at 2.4 GHz over an IEEE 802.15.4 protocol, and were designed to be distributed throughout the inside of a shipping container in the upper support frame. The tags are mounted in a housing that allows for simple and efficient installation or removal prior to, during, or after shipment. The distributed tags monitor the entire container volume. The sensor tag platform utilizes low power electronics and provides an extensible sensor interface for incorporating a wide range of sensors including chemical, biological, and environmental sensors.

Amaya, Ivan A.; Cree, Johnathan V.; Mauss, Fredrick J.

2011-05-06T23:59:59.000Z

143

Optical sensing elements for nitrogen dioxide (NO.sub.2) gas detection, a sol-gel method for making the sensing elements and fiber optic sensors incorporating nitrogen dioxide gas optical sensing elements  

DOE Patents [OSTI]

A sensing element, a method of making a sensing element, and a fiber optic sensor incorporating the sensing element are described. The sensor can be used for the quantitative detection of NO.sub.2 in a mixture of gases. The sensing element can be made by incorporating a diazotizing reagent which reacts with nitrous ions to produce a diazo compound and a coupling reagent which couples with the diazo compound to produce an azo dye into a sol and allowing the sol to form an optically transparent gel. The sensing element changes color in the presence of NO.sub.2 gas. The temporal response of the absorption spectrum at various NO.sub.2 concentrations has also been recorded and analyzed. Sensors having different design configurations are described. The sensing element can detect NO.sub.2 gas at levels of parts per billion.

Mechery, Shelly John (Mississippi State, MS); Singh, Jagdish P. (Starkville, MS)

2007-07-03T23:59:59.000Z

144

Method for improved selectivity in photo-activation of molecular agents  

DOE Patents [OSTI]

A method for the treatment of a particular volume of plant or animal tissue comprising the steps of treating the plant or animal tissue with at least one photo-active molecular agent, wherein the particular volume of the plant or animal tissue retains at least a portion of the at least one photo-active molecular agent, and then treating the particular volume of the plant or animal tissue with light sufficient to promote a simultaneous two-photon excitation of at least one of the at least one photo-active molecular agent retained in the particular volume of the plant or animal tissue, wherein the at least one photo-active molecular agent becomes active in the particular volume of the plant or animal tissue. There is also disclosed a method for the treatment of cancer in plant or animal tissue and a method for producing at least one photo-activated molecular agent in a particular volume of a material.

Fisher, Walter G. (Knoxville, TN); Wachter, Eric A. (Oak Ridge, TN); Dees, H. Craig (Knoxville, TN)

1999-01-01T23:59:59.000Z

145

Method for improved selectivity in photo-activation of molecular agents  

DOE Patents [OSTI]

A method for the treatment of a particular volume of plant or animal tissue comprising the steps of treating the plant or animal tissue with at least one photo-active molecular agent, wherein the particular volume of the plant or animal tissue retains at least a portion of the at least one photo-active molecular agent, and then treating the particular volume of the plant or animal tissue with light sufficient to promote a simultaneous two-photon excitation of at least one of the at least one photo-active molecular agent retained in the particular volume of the plant or animal tissue, wherein the at least one photo-active molecular agent becomes active in the particular volume of the plant or animal tissue. There is also disclosed a method for the treatment of cancer in plant or animal tissue and a method for producing at least one photo-activated molecular agent in a particular volume of a material.

Fisher, Walter G. (Knoxville, TN); Wachter, Eric A. (Oak Ridge, TN); Dees, H. Craig (Knoxville, TN)

1998-01-01T23:59:59.000Z

146

Method for improved selectivity in photo-activation of molecular agents  

DOE Patents [OSTI]

A method for the treatment of a particular volume of plant or animal tissue comprising the steps of treating the plant or animal tissue with at least one photo-active molecular agent, wherein the particular volume of the plant or animal tissue retains at least a portion of the at least one photo-active molecular agent, and then treating the particular volume of the plant or animal tissue with light sufficient to promote a simultaneous two-photon excitation of at least one of the at least one photo-active molecular agent retained in the particular volume of the plant or animal tissue, wherein the at least one photo-active molecular agent becomes active in the particular volume of the plant or animal tissue. There is also disclosed a method for the treatment of cancer in plant or animal tissue and a method for producing at least one photo-activated molecular agent in a particular volume of a material. 23 figs.

Fisher, W.G.; Wachter, E.A.; Dees, H.C.

1998-11-03T23:59:59.000Z

147

Active packing method for blue light-emitting diodes with photosensitive polymerization: formation of self-focusing encapsulates  

Science Journals Connector (OSTI)

A novel light-emitting diode (LED) packaging method, named the active packaging (AP) method, is presented in this paper. In this method, during the LED packaging process, the light...

Wang, Hao; Ryu, Jae-Hyoung; Lee, Kyu-Seung; Tan, Chun Hua; Jin, Lihua; Li, Songmei; Hong, Chang-Hee; Cho, Yong-Hoon; Liu, Songhao

2008-01-01T23:59:59.000Z

148

Methods, microfluidic devices, and systems for detection of an active enzymatic agent  

DOE Patents [OSTI]

Embodiments of the present invention provide methods, microfluidic devices, and systems for the detection of an active target agent in a fluid sample. A substrate molecule is used that contains a sequence which may cleave in the presence of an active target agent. A SNAP25 sequence is described, for example, that may be cleaved in the presence of Botulinum Neurotoxin. The substrate molecule includes a reporter moiety. The substrate molecule is exposed to the sample, and resulting reaction products separated using electrophoretic separation. The elution time of the reporter moiety may be utilized to identify the presence or absence of the active target agent.

Sommer, Gregory J; Hatch, Anson V; Singh, Anup K; Wang, Ying-Chih

2014-10-28T23:59:59.000Z

149

Variable Radii Connected Sensor Cover in Sensor ZONGHENG ZHOU, SAMIR R. DAS, HIMANSHU GUPTA  

E-Print Network [OSTI]

is to maintain the fidelity of the gathered data while minimizing energy usage in the network. Energy is spent to be monitored. The set of active sensors should also form a connected communication graph, so that they can of selecting a minimum energy-cost connected sensor cover, when each sensor node can vary its sensing

Gupta, Himanshu

150

Variable Radii Connected Sensor Cover in Sensor Networks Zongheng Zhou, Samir Das, Himanshu Gupta  

E-Print Network [OSTI]

of the gathered data while minimizing energy usage in the network. Energy is spent due to message transmissions of active sensors should also form a connected communication graph, so that they can autonomously respond energy-cost connected sensor cover, when each sensor node can vary its sensing and transmission radius

Das, Samir R.

151

Sensors and Controls Workshop Summary Report  

SciTech Connect (OSTI)

Higher operating efficiencies, emission reductions, improved reliability, and lower operating costs are benefits that the power industry can realize with the utilization of sensors and controls. However, for the power industry to derive the maximum benefit from sensors and controls, improvements in existing technologies and novel approaches to challenging measurements are needed. Recognizing the importance of sensors and controls, the U.S. Department of Energy (DOE) National Energy Technology Laboratory (NETL) sponsored a sensors and controls workshop on April 17 to 18, 2001, in Washington, DC. The workshop focused on identifying technology needs in sensors and controls for existing fossil-energy power plants as well as future facilities conceived under the Vision 21 Program. Forty-six experts from 29 organizations, including private industry, research laboratories, academia, and government agencies, attended the workshop. The meeting opened with keynote speakers from NETL and the private sector. NETL officials spoke of the Vision 21 and advanced research programs. Speakers from the Electric Power Research Institute (EPRI) and Delphi Automotive Systems Research Laboratory discussed the improvements realized with their respective operation through the use of sensors and controls. NETL keynote speakers Robert Romanosky and Carl Bauer emphasized that developing sensor and control systems plays a critical role in DOE Office of Fossil Energy Vision 21 Program, clean coal activities under the Power Plant Improvement Initiative, and the proposed Clean Coal Power Initiative. The Vision 21 Program is aimed at providing technologies for ultra-clean fossil-fuel-based energy production with 60- to 75-percent efficiencies and near zero emissions. The program also uses a modular approach to present opportunities to not only generate power, but also co-produce clean fuels, chemicals, steam, and other useful products. The ultra-high efficiency and environmental performance goals of the Vision 21 Program mean that facilities must operate at optimum conditions, while adapting in real-time to changes in load and feedstock. These are challenging performance goals. They will require advanced control and sensing systems that can be adapted and optimized in real time. To improve the overall plant performance of existing power plants, one of the most cost-effective methods is to update the sensor and control systems.

Susan Maley; Robert R. Romanosky

2001-11-30T23:59:59.000Z

152

Crystalline mesoporous tungsten oxide nanoplate monoliths synthesized by directed soft template method for highly sensitive NO{sub 2} gas sensor applications  

SciTech Connect (OSTI)

Graphical abstract: Display Omitted Highlights: ? Mesoporous WO{sub 3} nanoplate monoliths were obtained by direct templating synthesis. ? Enable effective accession of the analytic molecules for the sensor applications. ? The WO{sub 3} sensor exhibited a high performance to NO{sub 2} gas at low temperature. -- Abstract: Controllable synthesis of nanostructured metal oxide semiconductors with nanocrystalline size, porous structure, and large specific surface area is one of the key issues for effective gas sensor applications. In this study, crystalline mesoporous tungsten oxide nanoplate-like monoliths with high specific surface areas were obtained through instant direct-templating synthesis for highly sensitive nitrogen dioxide (NO{sub 2}) sensor applications. The copolymer soft template was converted into a solid carbon framework by heat treatment in an inert gas prior to calcinations in air to sustain the mesoporous structure of tungsten oxide. The multidirectional mesoporous structures of tungsten oxide with small crystalline size, large specific surface area, and superior physical characteristics enabled the rapid and effective accession of analytic gas molecules. As a result, the sensor response was enhanced and the response and recovery times were reduced, in which the mesoporous tungsten oxide based gas sensor exhibited a superior response of 21,155% to 5 ppm NO{sub 2}. In addition, the developed sensor exhibited selective detection of low NO{sub 2} concentration in ammonia and ethanol at a low temperature of approximately 150 C.

Hoa, Nguyen Duc, E-mail: ndhoa@itims.edu.vn [International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST) (Viet Nam); Duy, Nguyen Van [International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST) (Viet Nam)] [International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST) (Viet Nam); Hieu, Nguyen Van, E-mail: hieu@itims.edu.vn [International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST) (Viet Nam)

2013-02-15T23:59:59.000Z

153

E-Print Network 3.0 - airborne hyperspectral sensors Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

imaging activities in Europe, ranging from sensor design and flight operation to data collection... directed towards the improvement of hyperspectral sensor and mission...

154

Noisy clocks and silent sunrises: measurement methods of daily activity pattern  

E-Print Network [OSTI]

intensity or ambient temperature and thus of the sun's position in the sky: time of sunrise, zenith; distribution of activity. Correspondence Pierre Nouvellet. Current address: Biology and Environmental Science with the actual position of the sun. To demonstrate the important difference between these methods of analysis, we

Courchamp, Franck

155

Active Vibration Control on A 3-DOF Parallel Platform Based on Kane's Dynamics Method  

E-Print Network [OSTI]

- 2783 - Active Vibration Control on A 3-DOF Parallel Platform Based on Kane's Dynamics Method Yuan be impossible without a careful isolation of the instrument from the vibration sources. To reduce the vibration low remaining vibration level. This paper is concerned with the development of a vibration isolation

Li, Yangmin

156

Sandia National Laboratories: Sensors & Optical Diagnostics  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sensors & Optical Diagnostics New Polarized-Depolarized Measurement Capability Extends Use of RamanRayleigh Methods to More Flame Types On April 23, 2014, in Capabilities, CRF,...

157

Review of In-situ Fabrication Methods of Piezoelectric Wafer Active Sensor for Sensing and Actuation Applications  

E-Print Network [OSTI]

mounted on an aircraft panel, adjacent to rivet heads and an electric discharge machined (EDM) simulated

Giurgiutiu, Victor

158

NETL: Advanced Research - Sensors & Controls Innovations  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sensors & Controls Sensors & Controls Advanced Research Sensors & Controls Innovations OSU's O2 Sensor Ohio State University's reference-free potentiometric oxygen sensor capable of withstanding temperatures of 800 °C. Novel Sensors and Advanced Process Control Novel Sensors and Advanced Process Control are key enabling technologies for advanced near zero emission power systems. NETL's Advanced Research Program is leading the effort to develop sensing and control technologies and methods to achieve seamless, integrated, automated, optimized, and intelligent power systems. Today, the performance of advanced power systems is limited by the lack of sensors and controls capable of withstanding high temperature and pressure conditions. Harsh environments are inherent to new systems that aim to

159

ACCEPTED FOR PUBLICATION IN THE IEEE/ASME TRANSACTIONS ON MECHATRONICS, OCTOBER 2008 1 The Sensor-based Random Graph Method  

E-Print Network [OSTI]

ACCEPTED FOR PUBLICATION IN THE IEEE/ASME TRANSACTIONS ON MECHATRONICS, OCTOBER 2008 1 The Sensor. An interesting multi-robot architecture in which robots are guided through the exploration by a market economy

160

Comparative Evaluation of Cutting Methods of Activated Concrete from Nuclear Power Plant Decommissioning - 13548  

SciTech Connect (OSTI)

The amount of radioactive wastes from decommissioning of a nuclear power plant varies greatly depending on factors such as type and size of the plant, operation history, decommissioning options, and waste treatment and volume reduction methods. There are many methods to decrease the amount of decommissioning radioactive wastes including minimization of waste generation, waste reclassification through decontamination and cutting methods to remove the contaminated areas. According to OECD/NEA, it is known that the radioactive waste treatment and disposal cost accounts for about 40 percentage of the total decommissioning cost. In Korea, it is needed to reduce amount of decommissioning radioactive waste due to high disposal cost, about $7,000 (as of 2010) per a 200 liter drum for the low- and intermediate-level radioactive waste (LILW). In this paper, cutting methods to minimize the radioactive waste of activated concrete were investigated and associated decommissioning cost impact was assessed. The cutting methods considered are cylindrical and volume reductive cuttings. The study showed that the volume reductive cutting is more cost-effective than the cylindrical cutting. Therefore, the volume reductive cutting method can be effectively applied to the activated bio-shield concrete. (authors)

Kim, HakSoo; Chung, SungHwan; Maeng, SungJun [Central Research Institute, Korea Hydro and Nuclear Power Co. Ltd., 1312-70 Yuseong-daero, Yuseong-gu, Daejeon 305-343 (Korea, Republic of)] [Central Research Institute, Korea Hydro and Nuclear Power Co. Ltd., 1312-70 Yuseong-daero, Yuseong-gu, Daejeon 305-343 (Korea, Republic of)

2013-07-01T23:59:59.000Z

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


161

Gas sensor  

DOE Patents [OSTI]

A gas sensor is described which incorporates a sensor stack comprising a first film layer of a ferromagnetic material, a spacer layer, and a second film layer of the ferromagnetic material. The first film layer is fabricated so that it exhibits a dependence of its magnetic anisotropy direction on the presence of a gas, That is, the orientation of the easy axis of magnetization will flip from out-of-plane to in-plane when the gas to be detected is present in sufficient concentration. By monitoring the change in resistance of the sensor stack when the orientation of the first layer's magnetization changes, and correlating that change with temperature one can determine both the identity and relative concentration of the detected gas. In one embodiment the stack sensor comprises a top ferromagnetic layer two mono layers thick of cobalt deposited upon a spacer layer of ruthenium, which in turn has a second layer of cobalt disposed on its other side, this second cobalt layer in contact with a programmable heater chip.

Schmid, Andreas K.; Mascaraque, Arantzazu; Santos, Benito; de la Figuera, Juan

2014-09-09T23:59:59.000Z

162

Sensors & Measurement | More Science | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sensors and Measurements Sensors and Measurements SHARE Sensors and Measurement Oak Ridge National Laboratory's (ORNL) capability in the research and development of sensor materials, sensors technologies, new instrumentation, and measurement systems is critical to its ability to translate breakthrough science into robust technologies, systems, and methods that address high-risk, high-complexity, multidisciplinary issues of national importance. This capability is manifested in a culture that effectively creates and manages complex systems by (1) developing detailed analytical processes to establish requirements, (2) analyzing candidate system architectures, (3) engineering in critical performance attributes, and (4) delivering measurement systems that operate as expected from the outset and

163

Sensors 2009, 9, 8336-8348; doi:10.3390/s91008336 ISSN 1424-8220  

E-Print Network [OSTI]

Sensors 2009, 9, 8336-8348; doi:10.3390/s91008336 sensors ISSN 1424-8220 www.mdpi.com/journal/sensors. Under the identified biasing condition, the signal-to-noise ratio of the ISFET as a pH sensor is proved, biomolecules, neural activity, etc. [1-6]. In these applications, a large sensor array is becoming essential

Huang, Haimei

164

X-RAY FLUORESCENCE ANALYSIS OF HANFORD LOW ACTIVITY WASTE SIMULANTS METHOD DEVELOPMENT  

SciTech Connect (OSTI)

The x-ray fluorescence laboratory (XRF) in the Analytical Development Directorate (ADD) of the Savannah River National Laboratory (SRNL) was requested to develop an x-ray fluorescence spectrometry method for elemental characterization of the Hanford Tank Waste Treatment and Immobilization Plant (WTP) pretreated low activity waste (LAW) stream to the LAW Vitrification Plant. The WTP is evaluating the potential for using XRF as a rapid turnaround technique to support LAW product compliance and glass former batching. The overall objective of this task was to develop an XRF analytical method that provides rapid turnaround time (<8 hours), while providing sufficient accuracy and precision to determine variations in waste.

Jurgensen, A; David Missimer, D; Ronny Rutherford, R

2007-08-08T23:59:59.000Z

165

Improving microenvironmental exposure assessment with sensor-based  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Improving microenvironmental exposure assessment with sensor-based Improving microenvironmental exposure assessment with sensor-based time-activity data Speaker(s): Amanda Northcross Date: December 18, 2009 - 2:00pm Location: 90-3122 Exposure assessments to air pollution typically focus on either personal or microenvironmental measurements. Personal measurements can provide more accurate individual exposures, but tend to be intrusive and expensive. Microenvironmental measurements are commonly cheaper and have more flexibility in size, number, and weight requirements of the instrumentation, but must be adjusted by time-activity information for the population of interest. Time-activity data has traditionally been difficult to obtain and imprecise using the available social-science methods or expensive with GPS and more sophisticated equipment. Deployment of new

166

Virtual Sensors: Abstracting Data from Physical Sensors  

E-Print Network [OSTI]

Virtual Sensors: Abstracting Data from Physical Sensors TR-UTEDGE-2006-001 Sanem Kabadayi Adam Pridgen Christine Julien © Copyright 2006 The University of Texas at Austin #12;Virtual Sensors: Abstracting Data from Physical Sensors Sanem Kabadayi, Adam Pridgen, and Christine Julien The Center

Julien, Christine

167

Micro-Machined Thin Film Sensor Arrays For The Detection Of H2, Containing Gases, And Method Of Making And Using The Same.  

DOE Patents [OSTI]

The present invention provides a hydrogen sensor including a thin film sensor element formed by metal organic chemical vapor deposition (MOCVD) or physical vapor deposition (PVD), on a micro-hotplate structure. The thin film sensor element includes a film of a hydrogen-interactive metal film that reversibly interacts with hydrogen to provide a correspondingly altered response characteristic, such as optical transmissivity, electrical conductance, electrical resistance, electrical capacitance, magneto resistance, photoconductivity, etc., relative to the response characteristic of the film in the absence of hydrogen. The hydrogen-interactive metal film may be overcoated with a thin film hydrogen-permeable barrier layer to protect the hydrogen-interactive film from deleterious interaction with non-hydrogen species. The hydrogen permeable barrier may comprise species to scavenge oxygen and other like species. The hydrogen sensor of the invention may be usefully employed for the detection of hydrogen in an environment susceptible to the incursion or generation of hydrogen and may be conveniently configured as a hand-held apparatus.

DiMeo, Jr., Frank (Danbury, CT); Baum, Thomas H. (New Fairfield, CT)

2003-07-22T23:59:59.000Z

168

Photocatalytic activity enhancement of CdS through In doping by simple hydrothermal method  

Science Journals Connector (OSTI)

In doped CdS has been prepared by simple hydrothermal method and characterized by X-ray diffraction, scanning electron microscopy, UVvis spectrometer, and X-ray photoelectron spectroscopy techniques. The photocatalytic activity of the prepared samples was tested by Rhodamine B degradation under simulated solar light with the comparison of pure CdS sample. The results show that all the prepared samples have fine crystallinity, and In3+/Cd2+ molar ratio greatly affects the morphology and photocatalytic activity of the samples. In doped CdS reveals enhanced photocatalytic activity compared with pure CdS. As for the photocatalytic mechanism of Rh-B over the prepared sample, hole and electron are responsible for the photocatalytic degradation and OH does not have strong contribution. So, hole and electron may not get converted to OH for Rh-B degradation. The as-prepared nanostructure samples may have application potential for environmental purification due to their high photocatalytic activity.

A.M. Abdulkarem; E.M. Elssfah; Nan-Nan Yan; G. Demissie; Ying Yu

2013-01-01T23:59:59.000Z

169

Experimental Methods for Quantifying the Activity of Platinum Electrocatalysts for the Oxygen Reduction Reaction  

Science Journals Connector (OSTI)

Prior to that, he was senior manager/senior principal engineer at the Nissan Technical Center (NTCNA, MI) and Nissan Motor Company (NML, Japan) where he lead the Advanced Electrocatalysis Group in the development of novel enhanced activity and durability catalysts for automotive PEMFC applications. ... Central to the research and testing of new electrocatalysts for the ORR are the experimental and analytical methods necessary for the meaningful evaluation of electrocatalyst activity. ... The ORR of the good films have a single, steep reduction wave with a mixed kinetic-diffusion control region 0.75 V developed (flat) diffusion limited current density plateau, Jlim, in the potential region 0.20 V < E < 0.70 V. ...

Yannick Garsany; Olga A. Baturina; Karen E. Swider-Lyons; Shyam S. Kocha

2010-06-30T23:59:59.000Z

170

Monitor and control of cockroach locomotion with piezoelectric sensors  

E-Print Network [OSTI]

by employing noninvasive piezoelectric sensors and presenting a conceptual method of locomotion control. To do so, polyvinylidene fluoride thin sheets are used as bending sensors at the joints of a cockroachs legs. Approaches include development of polymeric...

Cooper, Rodrigo Alejandro

2009-05-15T23:59:59.000Z

171

Hydrogen sensor  

DOE Patents [OSTI]

A hydrogen sensor for detecting/quantitating hydrogen and hydrogen isotopes includes a sampling line and a microplasma generator that excites hydrogen from a gas sample and produces light emission from excited hydrogen. A power supply provides power to the microplasma generator, and a spectrometer generates an emission spectrum from the light emission. A programmable computer is adapted for determining whether or not the gas sample includes hydrogen, and for quantitating the amount of hydrogen and/or hydrogen isotopes are present in the gas sample.

Duan, Yixiang (Los Alamos, NM); Jia, Quanxi (Los Alamos, NM); Cao, Wenqing (Katy, TX)

2010-11-23T23:59:59.000Z

172

Carbon nanotube temperature and pressure sensors  

DOE Patents [OSTI]

The present invention, in one embodiment, provides a method of measuring pressure or temperature using a sensor including a sensor element composed of a plurality of carbon nanotubes. In one example, the resistance of the plurality of carbon nanotubes is measured in response to the application of temperature or pressure. The changes in resistance are then recorded and correlated to temperature or pressure. In one embodiment, the present invention provides for independent measurement of pressure or temperature using the sensors disclosed herein.

Ivanov, Ilia N; Geohegan, David Bruce

2013-10-29T23:59:59.000Z

173

Monitoring Energy Consumption In Wireless Sensor Networks  

E-Print Network [OSTI]

Monitoring Energy Consumption In Wireless Sensor Networks Matthias Witt, Christoph Weyer, it may impair the ability of the sensor network to function. Therefore, minimizing energy consumption energy consumption in both standby and active modes is the basis of wireless networks. Energy preserving

Turau, Volker

174

Sensors Handbook, 2 edition  

Science Journals Connector (OSTI)

Complete, State-of-the-Art Coverage of Sensor Technologies and Applications Fully revised with the latest breakthroughs in integrated sensors and control systems, Sensors Handbook, Second Edition provides all of the information needed ...

Sabrie Soloman

2009-11-01T23:59:59.000Z

175

Implementing a green bicycle alliance using a wireless sensor network  

Science Journals Connector (OSTI)

This study used the wireless sensor network (WSN) technique to design a bike device module, a bike path establishment module and a cloud service module. These three modules were used to address issues related to cycling activities, including green power supply, activity and health records, trajectory monitoring and group positioning and immediate safety issues. GPS was not required, and as long as the cyclists remained on the paths provided by the bike path establishment module and used the cloud service module, the previously mentioned issues could be addressed. The cloud service module included a path establishment simulation system that could enable a path manager to simulate paths before they were physically provided, to determine the ideal establishment method for providing wireless sensor nodes. This study use the Danshui Golden Waterfront in northern Taiwan to implement on-site establishment and installation.

Haw-Yun Shin; Chung-Ming Own

2014-01-01T23:59:59.000Z

176

3.5 Nanowire Sensors 3.5.1 Background  

E-Print Network [OSTI]

117 3.5 Nanowire Sensors 3.5.1 Background Nanowires are solid, rod-like materials with diameters that similar commercial products will eventually be available. 3.5.2 Description Nanowire sensors have et al. 2003). A comprehensive review of current research activities on chemical sensors based

177

Positive active material for an electric cell, a method of preparing the positive active material and a cell which uses it  

SciTech Connect (OSTI)

A positive active material is disclosed for an electric cell, said material being constituted by anhydrous copper borate whose formula is Cu/sub 3/B/sub 2/O/sub 6/. A method of making such an active material. An electric cell whose positive active material is anhydrous copper borate Cu/sub 3/B/sub 2/O/sub 6/, whose negative active material is lithium and whose electrolyte is a solution which is liquid at ambient temperature and whose solvent is an aprotic compound.

Broussely, M.; Lecerf, A.

1981-09-29T23:59:59.000Z

178

Sensors & Measurement | Clean Energy | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Electrical and Electronics Systems Research Sustainable Electricity Systems Biology Transportation Clean Energy Home | Science & Discovery | Clean Energy | Research Areas | Sensors & Measurement SHARE Sensors & Measurement Oak Ridge National Laboratory's (ORNL) capability in the research and development of sensor materials, sensors technologies, new instrumentation, and measurement systems is critical to its ability to translate breakthrough science into robust technologies, systems, and methods that address high-risk, high-complexity, multidisciplinary issues of national importance. This capability is manifested in a culture that effectively creates and manages complex systems by (1) developing detailed analytical processes to establish requirements, (2) analyzing candidate system

179

Photogrammetry & Machine Vision 1. Image sensors  

E-Print Network [OSTI]

Photogrammetry & Machine Vision 1. Image sensors (a) Fundamentals of image sensors (b) CCD image. Remondino, N. D'Apuzzo Photogrammetry and Machine Vision ­ 2. Camera calibration and orientation (b) Camera and Machine Vision ­ 2. Camera calibration and orientation (b) Calibration methods (reference object, point

Giger, Christine

180

Method Development to Evaluate the Oxygen Reduction Activity of High-Surface-Area Catalysts for Li-Air Batteries  

E-Print Network [OSTI]

This study presents a new method to quantitatively determine the electrocatalytic activity of Vulcan carbon and Vulcan-supported Au nanoparticles, dispersed as catalyst thin films on glass carbon, for oxygen reduction in ...

Lu, Yi-Chun

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


181

Configurable dynamic privacy for pervasive sensor networks  

E-Print Network [OSTI]

Ubiquitous computing sensor networks have greatly augmented the functionality of interactive media systems by adding the ability to capture and store activity-related information. Analyzing the information recorded from ...

Gong, Nan-Wei

2009-01-01T23:59:59.000Z

182

Methods of communicating activities in pollution abatement by five hundred major industrial corporations in the United States  

E-Print Network [OSTI]

METHODS OF COMMUNICATING ACTIVITIES IN POLLUTION ABATEMENT BY FIVE HUNDRED MAJOR INDUSTRIAL CORPORATIONS IN THE UNITED STATES A Thesis by CHRISTINE ANN OUINN Submitted to the Graduate College of Texas A&M University in partial fulfillment... of the requirement for the degree of MASTER OF SCIENCE August 1973 Major Subject: Educational Administration (Public Relations) METHODS OF COMMUNICATING ACTIVITIES IN POLLUTION ABATEMENT BY FIVE HUNDRED MAJOR INDUSTRIAL CORPORATIONS IN THE UNITED STATES A...

Quinn, Christine Ann

2012-06-07T23:59:59.000Z

183

Multi-Group Transport Methods for High-Resolution Neutron Activation Analysis  

SciTech Connect (OSTI)

The accurate and efficient simulation of coupled neutron-photon problems is necessary for several important radiation detection applications. Examples include the detection of nuclear threats concealed in cargo containers and prompt gamma neutron activation analysis for nondestructive determination of elemental composition of unknown samples. In these applications, high-resolution gamma-ray spectrometers are used to measure the spectrum of the emitted photon flux, which consists of both continuum and characteristic gamma rays with discrete energies. Monte Carlo transport is the most commonly used simulation tool for this type of problem, but computational times for many problems can be prohibitively long. This work explores the use of multi-group deterministic methods for the simulation of coupled neutron-photon problems.

Burns, Kimberly A.; Smith, Leon E.; Gesh, Christopher J.; Shaver, Mark W.

2009-09-24T23:59:59.000Z

184

Remotely Deployed Virtual Sensors  

E-Print Network [OSTI]

Remotely Deployed Virtual Sensors TR-UTEDGE-2007-010 Sanem Kabadayi Christine Julien © Copyright 2007 The University of Texas at Austin #12;Remotely Deployed Virtual Sensors Sanem Kabadayi that run on mobile client devices connect to the sensors of a multihop sensor network. For emerging

Julien, Christine

185

Development of a portable grain mass flow sensor test rig  

Science Journals Connector (OSTI)

A portable grain mass flow sensor test rig was built to measure the accuracy of a mass flow sensor with dual use in the field as well as in the lab. Concurrently, a synchronization method was developed that employs GPS timing data to synchronize the ... Keywords: Mass flow sensor, Test rig, Yield monitor accuracy, Yield monitor error

M. Loghavi; R. Ehsani; R. Reeder

2008-05-01T23:59:59.000Z

186

Simulating Microstructural Evolution and Electrical Transport in Ceramic Gas Sensors  

E-Print Network [OSTI]

. In this paper, using the example of the thermal processing of ceramic gas sensors, an integrated compu- tationalSimulating Microstructural Evolution and Electrical Transport in Ceramic Gas Sensors Yunzhi Wang in ceramic gas sensors has been proposed. First, the particle-flow model and the continuum-phase-field method

Ciobanu, Cristian

187

Application of Next-Generation Sensor Systems in HTRs  

E-Print Network [OSTI]

. This thesis develops neutron flux reconstruction methods for in-core sensors placed in HTRs. Sensor systems developed for current generation reactors cannot be used in HTRs. The high temperatures inside HTRs preclude the use of existing in-core sensors...

Johnson, Matthew Paul

2013-04-30T23:59:59.000Z

188

System and method of active vibration control for an electro-mechanically cooled device  

DOE Patents [OSTI]

A system and method of active vibration control of an electro-mechanically cooled device is disclosed. A cryogenic cooling system is located within an environment. The cooling system is characterized by a vibration transfer function, which requires vibration transfer function coefficients. A vibration controller generates the vibration transfer function coefficients in response to various triggering events. The environments may differ by mounting apparatus, by proximity to vibration generating devices, or by temperature. The triggering event may be powering on the cooling system, reaching an operating temperature, or a reset action. A counterbalance responds to a drive signal generated by the vibration controller, based on the vibration signal and the vibration transfer function, which adjusts vibrations. The method first places a cryogenic cooling system within a first environment and then generates a first set of vibration transfer function coefficients, for a vibration transfer function of the cooling system. Next, the cryogenic cooling system is placed within a second environment and a second set of vibration transfer function coefficients are generated. Then, a counterbalance is driven, based on the vibration transfer function, to reduce vibrations received by a vibration sensitive element.

Lavietes, Anthony D. (Hayward, CA); Mauger, Joseph (Livermore, CA); Anderson, Eric H. (Mountain View, CA)

2000-01-01T23:59:59.000Z

189

Fiber-Optic Long-Line Position Sensor  

Energy Innovation Portal (Marketing Summaries) [EERE]

Sandia National Laboratories has developed a side-emitting fiber optic position sensor and method of determining an unknown position of an object by using the sensor. Non-electrical position sensors like the one developed by Sandia are desirable for use in hazardous environment, e.g., for measuring the liquid level in gasoline or jet fuel tanks. This sensor is an attractive option because it does notintroduce electrical energy, is insensitive to electromagnetic interference,...

2013-03-12T23:59:59.000Z

190

Connected K-Coverage Problem in Sensor Networks Zongheng Zhou, Samir Das, Himanshu Gupta  

E-Print Network [OSTI]

energy usage in the network. Energy is spent due to message transmissions among sensor nodes, or due-- In overdeployed sensor networks, one approach to conserve energy is to keep only a small subset of sensors active" by at least K different sensors in M, and the communication graph induced by M is connected. For the above

Das, Samir R.

191

Connected K-Coverage Problem in Sensor Networks Zongheng Zhou, Samir Das, Himanshu Gupta  

E-Print Network [OSTI]

energy usage in the network. Energy is spent due to message transmissions among sensor nodes, or due-- In overdeployed sensor networks, one approach to conserve energy is to keep only a small subset of sensors active" by at least different sensors in ¡ , and the communication graph induced by ¡ is connected. For the above

Gupta, Himanshu

192

A FRAMEWORK FOR DESIGNING SENSOR-BASED INTERACTIONS TO PROMOTE EXPLORATION AND REFLECTION IN PLAY  

E-Print Network [OSTI]

with a discussion of the core properties of sensor technologies. 1. INTRODUCTION Originally, sensor technology uses of sensors were monitoring activities, such as the thermostat of a central heating system. If the building was too cold the heating was switched on. Nowadays, sensors are being used in a range

193

Life patterns : structure from wearable sensors  

E-Print Network [OSTI]

In this thesis I develop and evaluate computational methods for extracting life's patterns from wearable sensor data. Life patterns are the reoccurring events in daily behavior, such as those induced by the regular cycle ...

Clarkson, Brian Patrick, 1975-

2003-01-01T23:59:59.000Z

194

Fiber optic temperature sensor  

SciTech Connect (OSTI)

Our fiber optic temperature measurement sensor and system is a major improvement over methods currently in use in most industrial processes, and it delivers all of the attributes required simplicity, accuracy, and cost efficiency-to help improve all of these processes. Because temperature is a basic physical attribute of nearly every industrial and commercial process, our system can eventually result in significant improvements in nearly every industrial and commercial process. Many finished goods, and the materials that go into them, are critically dependent on the temperature. The better the temperature measurement, the better quality the goods will be and the more economically they can be produced. The production and transmission of energy requires the monitoring of temperature in motors, circuit breakers, power generating plants, and transmission line equipment. The more reliable and robust the methods for measuring these temperature, the more available, stable, and affordable the supply of energy will become. The world is increasingly realizing the threats to health and safety of toxic or otherwise undesirable by products of the industrial economy in the environment. Cleanup of such contamination often depends on techniques that require the constant monitoring of temperature in extremely hazardous environments, which can damage most conventional temperature sensors and which are dangerous for operating personnel. Our system makes such monitoring safer and more economical.

Rabold, D.

1995-12-01T23:59:59.000Z

195

IMPACTS: Industrial Technologies Program, Summary of Program Results for CY2009, Appendix 6: Method of Calculating Results from DOE's Combined Heat and Power Activities  

Broader source: Energy.gov (indexed) [DOE]

87 DOE Industrial Technologies Program 87 DOE Industrial Technologies Program Appendix 6: Method of Calculating Results from DOE's Combined Heat and Power Activities u CHP Table........................................................................................................................................................................................... 189 Method of Calculating Results from DOE's Combined Heat and Power Activities Industrial Distributed Energy, a cross-cutting activity within the Industrial Technologies Program (ITP), builds on activities conducted by DOE's Office of Industrial Technologies

196

Z .Sensors and Actuators B 65 2000 270272 www.elsevier.nlrlocatersensorb  

E-Print Network [OSTI]

Z .Sensors and Actuators B 65 2000 270­272 www.elsevier.nlrlocatersensorb Semiconductor sensors For the detection of fluorine, two different preparation methods for semiconductor gas sensors were developed.01 and 10 ppm type II . The sensitivity of Z Z ..type I sensors is about 116 mVrlg p F . It is possible

Moritz, Werner

197

Vibration welding system with thin film sensor  

DOE Patents [OSTI]

A vibration welding system includes an anvil, a welding horn, a thin film sensor, and a process controller. The anvil and horn include working surfaces that contact a work piece during the welding process. The sensor measures a control value at the working surface. The measured control value is transmitted to the controller, which controls the system in part using the measured control value. The thin film sensor may include a plurality of thermopiles and thermocouples which collectively measure temperature and heat flux at the working surface. A method includes providing a welder device with a slot adjacent to a working surface of the welder device, inserting the thin film sensor into the slot, and using the sensor to measure a control value at the working surface. A process controller then controls the vibration welding system in part using the measured control value.

Cai, Wayne W; Abell, Jeffrey A; Li, Xiaochun; Choi, Hongseok; Zhao, Jingzhou

2014-03-18T23:59:59.000Z

198

Inertial measurement unit using rotatable MEMS sensors  

DOE Patents [OSTI]

A MEM inertial sensor (e.g. accelerometer, gyroscope) having integral rotational means for providing static and dynamic bias compensation is disclosed. A bias compensated MEM inertial sensor is described comprising a MEM inertial sense element disposed on a rotatable MEM stage. A MEM actuator drives the rotation of the stage between at least two predetermined rotational positions. Measuring and comparing the output of the MEM inertial sensor in the at least two rotational positions allows for both static and dynamic bias compensation in inertial calculations based on the sensor's output. An inertial measurement unit (IMU) comprising a plurality of independently rotatable MEM inertial sensors and methods for making bias compensated inertial measurements are disclosed.

Kohler, Stewart M. (Albuquerque, NM); Allen, James J. (Albuquerque, NM)

2007-05-01T23:59:59.000Z

199

Building Adaptable Sensor Networks with Sensor Cubes  

E-Print Network [OSTI]

of layers allows easy experiments, upgrades and extensions Small-scale sensor network Example sensor module- world network algorithm and power management behavior · Results from small scale tests can be compared (short packets and high bit rate reduce collision probability); Transmitter's MAC table logic: Small

Roussos, George

200

Fiber optic geophysical sensors  

DOE Patents [OSTI]

A fiber optic geophysical sensor in which laser light is passed through a sensor interferometer in contact with a geophysical event, and a reference interferometer not in contact with the geophysical event but in the same general environment as the sensor interferometer. In one embodiment, a single tunable laser provides the laser light. In another embodiment, separate tunable lasers are used for the sensor and reference interferometers. The invention can find such uses as monitoring for earthquakes, and the weighing of objects.

Homuth, Emil F. (Los Alamos, NM)

1991-01-01T23:59:59.000Z

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


201

Giant magnetoresistive sensor  

DOE Patents [OSTI]

A magnetoresistive sensor element with a three-dimensional micro-architecture is capable of significantly improved sensitivity and highly localized measurement of magnetic fields. The sensor is formed of a multilayer film of alternately magnetic and nonmagnetic materials. The sensor is optimally operated in a current perpendicular to plane mode. The sensor is useful in magnetic read/write heads, for high density magnetic information storage and retrieval.

Stearns, Daniel G. (Los Altos, CA); Vernon, Stephen P. (Pleasanton, CA); Ceglio, Natale M. (Livermore, CA); Hawryluk, Andrew M. (Modesto, CA)

1999-01-01T23:59:59.000Z

202

Sensor system scaling issues  

SciTech Connect (OSTI)

A model for IR sensor performance is used to compare estimates of sensor cost effectiveness. Although data from aircraft sensors indicate a weaker scaling, their agreement is adequate to support the assessment of the benefits of operating up to the maximum altitude of most current UAVs.

Canavan, G.H.

1996-07-01T23:59:59.000Z

203

Sensors for Environmental Observatories  

E-Print Network [OSTI]

Sensors for Environmental Observatories Report of the NSF-Sponsored Workshop December 2004 #12 States of America. 2005. #12;Sensors for Environmental Observatories Report of the NSF Sponsored Workshop sensor technology and the networks that collect data from them. Present work clearly demonstrates

Hamilton, Michael P.

204

New functional polymers for sensors, smart materials and solar cells  

E-Print Network [OSTI]

Organic polymers can be used as the active component of sensors, smart materials, chemical-delivery systems and the active layer of solar cells. The rational design and modification of the chemical structure of polymers ...

Lobez Comeras, Jose Miguel

2012-01-01T23:59:59.000Z

205

E-Print Network 3.0 - active power method Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and Nonlinear Loads Jos Mahomar, Luis Morn... active power filters. The algorithm is proved by simulation in a multibus industrial power distribution... system and...

206

Abstract--Efficient methods for detecting electricity fraud has been an active research area in recent years. This paper presents  

E-Print Network [OSTI]

1 Abstract--Efficient methods for detecting electricity fraud has been an active research area for electric utilities using Genetic Algorithm (GA) and Support Vector Machine (SVM). The main motivation, genetic algorithm, electricity theft, non-technical loss, load profile. I. INTRODUCTION LECTRIC utilities

Ducatelle, Frederick

207

Method for improved selectivity in photo-activation of molecular agents  

DOE Patents [OSTI]

An apparatus for the treatment of a particular volume of plant or animal tissue by treating the plant or animal tissue with at least one photo-active molecular agent, wherein the particular volume of the plant or animal tissue retains at least a portion of the at least one photo-active molecular agent, and then treating the particular volume of the plant or animal tissue with light sufficient to promote a simultaneous two-photon excitation of at least one of the at least one photo-active molecular agent retained in the particular volume of the plant or animal tissue, wherein the at least one photo-active molecular agent becomes active in the particular volume of the plant or animal tissue.

Fisher, Walter G. (Knoxville, TN); Wachter, Eric A. (Oak Ridge, TN); Dees, H. Craig (Knoxville, TN)

2000-01-01T23:59:59.000Z

208

Micromechanical potentiometric sensors  

DOE Patents [OSTI]

A microcantilever potentiometric sensor utilized for detecting and measuring physical and chemical parameters in a sample of media is described. The microcantilevered spring element includes at least one chemical coating on a coated region, that accumulates a surface charge in response to hydrogen ions, redox potential, or ion concentrations in a sample of the media being monitored. The accumulation of surface charge on one surface of the microcantilever, with a differing surface charge on an opposing surface, creates a mechanical stress and a deflection of the spring element. One of a multitude of deflection detection methods may include the use of a laser light source focused on the microcantilever, with a photo-sensitive detector receiving reflected laser impulses. The microcantilevered spring element is approximately 1 to 100 .mu.m long, approximately 1 to 50 .mu.m wide, and approximately 0.3 to 3.0 .mu.m thick. An accuracy of detection of deflections of the cantilever is provided in the range of 0.01 nanometers of deflection. The microcantilever apparatus and a method of detection of parameters require only microliters of a sample to be placed on, or near the spring element surface. The method is extremely sensitive to the detection of the parameters to be measured.

Thundat, Thomas G. (Knoxville, TN)

2000-01-01T23:59:59.000Z

209

Electrode-active material for electrochemical batteries and method of preparation  

DOE Patents [OSTI]

A battery electrode material comprises a non-stoichiometric electrode-active material which forms a redox pair with the battery electrolyte, an electrically conductive polymer present in the range of from about 2% by weight to about 5% by weight of the electrode-active material, and a binder. The conductive polymer provides improved proton or ion conductivity and is a ligand resulting in metal ion or negative ion vacancies of less than about 0.1 atom percent. Specific electrodes of nickel and lead are disclosed.

Varma, R.

1983-11-07T23:59:59.000Z

210

A method for using polyethylene passive samplers to measure polycyclic aromatic hydrocarbon chemical activity in sediments  

E-Print Network [OSTI]

In order to aid in the determination of the hazards posed by hydrophobic organic compounds (HOCs) in sediment beds, a method for the use of polyethylene (PE) sheets as passive sampling devices for measuring chemical ...

Fernandez, Loretta A. (Loretta Ana)

2005-01-01T23:59:59.000Z

211

Diffractive laser beam homogenizer including a photo-active material and method of fabricating the same  

SciTech Connect (OSTI)

A method of manufacturing a plurality of diffractive optical elements includes providing a partially transmissive slide, providing a first piece of PTR glass, and directing first UV radiation through the partially transmissive slide to impinge on the first piece of PTR glass. The method also includes exposing predetermined portions of the first piece of PTR glass to the first UV radiation and thermally treating the exposed first piece of PTR glass. The method further includes providing a second piece of PTR glass and directing second UV radiation through the thermally treated first piece of PTR glass to impinge on the second piece of PTR glass. The method additionally includes exposing predetermined portions of the second piece of PTR glass to the second UV radiation, thermally treating the exposed second piece of PTR glass, and repeating providing and processing of the second piece of PTR glass using additional pieces of PTR glass.

Bayramian, Andy J; Ebbers, Christopher A; Chen, Diana C

2014-05-20T23:59:59.000Z

212

Capacitive chemical sensor  

DOE Patents [OSTI]

A microfabricated capacitive chemical sensor can be used as an autonomous chemical sensor or as an analyte-sensitive chemical preconcentrator in a larger microanalytical system. The capacitive chemical sensor detects changes in sensing film dielectric properties, such as the dielectric constant, conductivity, or dimensionality. These changes result from the interaction of a target analyte with the sensing film. This capability provides a low-power, self-heating chemical sensor suitable for remote and unattended sensing applications. The capacitive chemical sensor also enables a smart, analyte-sensitive chemical preconcentrator. After sorption of the sample by the sensing film, the film can be rapidly heated to release the sample for further analysis. Therefore, the capacitive chemical sensor can optimize the sample collection time prior to release to enable the rapid and accurate analysis of analytes by a microanalytical system.

Manginell, Ronald P; Moorman, Matthew W; Wheeler, David R

2014-05-27T23:59:59.000Z

213

Working Group Report: Sensors  

SciTech Connect (OSTI)

Sensors play a key role in detecting both charged particles and photons for all three frontiers in Particle Physics. The signals from an individual sensor that can be used include ionization deposited, phonons created, or light emitted from excitations of the material. The individual sensors are then typically arrayed for detection of individual particles or groups of particles. Mounting of new, ever higher performance experiments, often depend on advances in sensors in a range of performance characteristics. These performance metrics can include position resolution for passing particles, time resolution on particles impacting the sensor, and overall rate capabilities. In addition the feasible detector area and cost frequently provides a limit to what can be built and therefore is often another area where improvements are important. Finally, radiation tolerance is becoming a requirement in a broad array of devices. We present a status report on a broad category of sensors, including challenges for the future and work in progress to solve those challenges.

Artuso, M.; et al.,

2013-10-18T23:59:59.000Z

214

A method for calculating active feedback system to control vertical position of plasma in a tokamak  

Science Journals Connector (OSTI)

In designing tokamaks, the maintenance of vertical stability of plasma is one of the most important problems. For this purpose systems of passive and active feedbacks are applied. The role of passive system consisting of a vacuum vessel and passive stabilizer ...

Nizami Gasilov

2006-08-01T23:59:59.000Z

215

Thermal Protection of an Inductive Proximity Sensor Utilizing Low-Density Ceramic Composition Tile.  

E-Print Network [OSTI]

??This thesis presents the results of a unique method for protecting inductive proximity (IP) sensors from extreme thermal exposure. The method presented in this study (more)

Anger, Kim

2010-01-01T23:59:59.000Z

216

A new method to estimate annual solar wind parameters and contributions of different solar wind structures to geomagnetic activity  

E-Print Network [OSTI]

In this paper, we study two sets of local geomagnetic indices from 26 stations using the principal component (PC) and the independent component (IC) analysis methods. We demonstrate that the annually averaged indices can be accurately represented as linear combinations of two first components with weights systematically depending on latitude. We show that the annual contributions of coronal mass ejections (CMEs) and high speed streams (HSSs) to geomagnetic activity are highly correlated with the first and second IC. The first and second ICs are also found to be very highly correlated with the strength of the interplanetary magnetic field (IMF) and the solar wind speed, respectively, because solar wind speed is the most important parameter driving geomagnetic activity during HSSs while IMF strength dominates during CMEs. These results help in better understanding the long-term driving of geomagnetic activity and in gaining information about the long-term evolution of solar wind parameters and the different sol...

Holappa, Lauri; Asikainen, Timo

2015-01-01T23:59:59.000Z

217

MTDC Safety Sensor Technology  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

MTDC Safety Sensor Technology MTDC Safety Sensor Technology Background Beyond the standard duty cycle data collection system used in the Department of Energy's Medium Truck Duty Cycle program, additional sensors were installed on three test vehicles to collect several safety-related signals of interest to the Federal Motor Carrier Safety Administration. The real-time brake stroke, tire pressure, and weight information obtained from these sensors is expected to make possible a number of safety-related analyses such as determining the frequency and severity of braking events and tracking tire pressure changes over time. Because these signals are posted to the vehicle's databus, they also have the potential to be

218

Fiber optic geophysical sensors  

DOE Patents [OSTI]

A fiber optic geophysical sensor is described in which laser light is passed through a sensor interferometer in contact with a geophysical event, and a reference interferometer not in contact with the geophysical event but in the same general environment as the sensor interferometer. In one embodiment, a single tunable laser provides the laser light. In another embodiment, separate tunable lasers are used for the sensor and reference interferometers. The invention can find such uses as monitoring for earthquakes, and the weighing of objects. 2 figures.

Homuth, E.F.

1991-03-19T23:59:59.000Z

219

Activities  

Broader source: Energy.gov [DOE]

Activities and events provide Residential Network members the opportunity to discuss similar needs and challenges, and to collectively identify effective strategies and useful resources.

220

A fluorescence method to detect photo-activated repair of UV-induced DNA damage in marine organisms  

SciTech Connect (OSTI)

After UV exposure, marine microorganisms may re-activate their photosynthetic systems or regain their pre-exposure metabolic rates, but they will not long survive, nor grow or reproduce, if they cannot repair DNA or ERN damage. Several repair mechanisms, including nucleotide excision repair and photo-reactivation, are known in terrestrial organisms, but there is little information on either process in marine microorganisms. Photo-reactivation may be especially important near the ocean surface where a few meters difference in vertical position or a few hours difference in time may alleviate UV-irradiation stress yet still provide sufficient light for photoactivated repair processes. We have developed a relatively simple, sensitive method to measure the activity of the photo-reactivation enzyme, photolyase, by fluorometry. UV irradiation causes adjacent thymine nucleotides in DNA to form cyclobutane dimers. Photolyase attaches to the dimerized DNA then breaks the dimers in a reaction catalyzed by visible light, thereby allowing restoration of cross-strand base pairing. Our assay for photolyase activity involves a dimerized synthetic DNA and DNA-specific fluorochromes with affinity for thymine-rich regions of DNA. When thymine dimers are present, fluorescence of these dyes is reduced. As dimers are repaired, fluorescence increases, allowing us to demonstrate the presence of photolyase and measure its activity using conventional fluorometers available in most marine laboratories. Photo-reactivation activity has been unambiguously demonstrated in samples of coastal seawater. In preliminary investigations, cells taken from surface slicks did not have enhanced photo-repair capabilities relative to cells collected 5 meters below the surface. Additional tests of the method and measurements of photo-repair activities of surface and subsurface organisms will be made during the SLIX-89 Surface Microlayer Experiment in October 1989.

Carlson, D.J.; Mordy, C.W.; Nelson, K. (Oregon State Univ., Corvallis (United States))

1990-01-09T23:59:59.000Z

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


221

Single walled carbon nanotubes functionally adsorbed to biopolymers for use as chemical sensors  

DOE Patents [OSTI]

Chemical field effect sensors comprising nanotube field effect devices having biopolymers such as single stranded DNA functionally adsorbed to the nanotubes are provided. Also included are arrays comprising the sensors and methods of using the devices to detect volatile compounds.

Johnson, Jr., Alan T. (Philadelphia, PA); Gelperin, Alan (Princeton, NJ); Staii, Cristian (Madison, WI)

2011-07-12T23:59:59.000Z

222

Artificial Neural Network Applied to Prediction of Fluorquinolone Antibacterial Activity by Topological Methods  

Science Journals Connector (OSTI)

This method uses neural networks in which training algorithms are used as well as different concepts and methods of artificial intelligence with a suitable set of topological descriptors. ... The artificial neural network seeks to capitalize upon this design by providing a network of neurons, arranged in layers, which all contribute in some measure to complex decisions. ... In the typical neural net every connection between two neurons is associated with a weight, a positive or negative real number which multiplies the signal from the preceding neuron. ...

Jos Jan-Oltra; Ma Teresa Salabert-Salvador; Francisco J. Garca-March; Facundo Prez-Gimnez; Francisco Toms-Vert

2000-02-24T23:59:59.000Z

223

Comparison of active and passive methods for radon exhalation from a highexposure building material  

Science Journals Connector (OSTI)

......Famagusta, North Cyprus, Mersin10, Turkey...is a radioactive gas, which has a half-life...ionising radiation from natural sources. This contribution...method To measure Rn gas, an AlphaGUARD model...Bq m3 for the Rn gas at workplaces(16...Photon attenuation, natural radioactivity content......

A. Abbasi; F. Mirekhtiary

2013-12-01T23:59:59.000Z

224

Adaptable Sensor Packaging for High Temperature Fossil Fuel Energy System  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Adaptable Sensor Packaging for High Adaptable Sensor Packaging for High Temperature Fossil Fuel Energy Systems Background The Advanced Research Sensors and Controls Program is leading the effort to develop sensing and control technologies and methods to achieve automated and optimized intelligent power systems. The program is led by the U.S. Department of Energy (DOE) Office of Fossil Energy National Energy Technology Laboratory (NETL) and is implemented through research and development agreements with other

225

Molecular sieve sensors for selective detection at the nanogram level  

DOE Patents [OSTI]

The invention relates to a selective chemical sensor for selective detection of chemical entities even at the nanogram level. The invention further relates to methods of using the sensor. The sensor comprises: (a) a piezoelectric substrate capable of detecting mass changes resulting from adsorption of material thereon; and (b) a coating applied to the substrate, which selectively sorbs chemical entities of a size smaller than a preselected magnitude.

Bein, Thomas (Albuquerque, NM); Brown, Kelly D. (Albuquerque, NM); Frye, Gregory C. (Albuquerque, NM); Brinker, Charles J. (Albuquerque, NM)

1992-01-01T23:59:59.000Z

226

Adaptive Sampling for Wireless Sensor Networks Rebecca M. Willett  

E-Print Network [OSTI]

net- work that can significantly reduce energy consumption. Under a piecewise smooth field assumption activating only n3/4 of the sensors in the net- work. This approach can save significant energy compared acquisition, and communication contribute significantly to the energy ex- penditure of wireless sensor

Willett, Rebecca

227

Energy Conservation in Sensor and  

E-Print Network [OSTI]

Chapter 4 Energy Conservation in Sensor and Sensor-Actuator Networks Ivan Stojmenovic 4 wireless network, and must work unattended. The limited energy budget at the individual sensor level

Stojmenovic, Ivan

228

Detecting Eating Using a Wrist Mounted Device During Normal Daily Activities  

E-Print Network [OSTI]

Detecting Eating Using a Wrist Mounted Device During Normal Daily Activities Yujie Dong1, Adam method for automated monitoring of eating. Our method uses a single sensor that is worn on the wrist, similar in form to a watch. Wrist orientation was captured at a rate of 60 Hz for an entire day while four

Hoover, Adam

229

List of Lighting Controls/Sensors Incentives | Open Energy Information  

Open Energy Info (EERE)

Sensors Incentives Sensors Incentives Jump to: navigation, search The following contains the list of 493 Lighting Controls/Sensors Incentives. CSV (rows 1 - 493) Incentive Incentive Type Place Applicable Sector Eligible Technologies Active AEP (Central and North) - CitySmart Program (Texas) Utility Rebate Program Texas Commercial Industrial Institutional Local Government Schools Boilers Central Air conditioners Chillers Comprehensive Measures/Whole Building Custom/Others pending approval Energy Mgmt. Systems/Building Controls Furnaces Heat pumps Lighting Lighting Controls/Sensors Motor VFDs Motors Roofs Windows Yes AEP (Central, North and SWEPCO) - Commercial Solutions Program (Texas) Utility Rebate Program Texas Commercial Industrial Institutional Local Government Nonprofit

230

Urban form and long-term fuel supply decline: A method to investigate the peak oil risks to essential activities  

Science Journals Connector (OSTI)

The issue of a peak in world oil supply has become a mainstream concern over the past several years. The petroleum geology models of post-peak oil production indicate supply declines from 1.5% to 6% per year. Travel requires fuel energy, but current transportation planning models do not include the impacts of constrained fuel supply on private travel demand. This research presents a method to assess the risk to activities due to a constrained fuel supply relative to projected unconstrained travel demand. The method assesses the probability of different levels of fuel supply over a given planning horizon, then calculates impact due to the energy supply not meeting the planning expectations. A new travel demand metric which characterizes trips as essential, necessary, and optional to wellbeing is used in the calculation. A case study explores four different urban forms developed from different future growth options for the urban development strategy of Christchurch, New Zealand to 2041. Probable fuel supply availability was calculated, and the risk to transport activities in the 2041 transport model was assessed. The results showed all the urban forms had significantly reduced trip numbers and lower energy mode distributions from the current planning projections, but the risk to activities differed among the planning options. Density is clearly one of the mitigating factors, but density alone does not provide a solution to reduced energy demand. The method clearly shows how risk to participation in activities is lower for an urban form which has a high degree of human powered and public transport access to multiple options between residential and commercial/industrial/service destinations. This analysis has led to new thinking about adaptation and reorganization of urban forms as a strategy for energy demand reduction rather than just densification.

Susan Krumdieck; Shannon Page; Andr Dantas

2010-01-01T23:59:59.000Z

231

Sensors and actuators 1990  

SciTech Connect (OSTI)

This book contains the proceedings on sensors and actuators 1990. Topics covered include: Hot wire air flow meter for engine control systems, A technique for the real-time estimation of air-fuel ratio using molecular weight ratios, combustion knock sensing: Sensor selection and application issues, and An indirect sensing technique for closed-loop diesel fuel quantity control.

Not Available

1990-01-01T23:59:59.000Z

232

Sensors & Materials | Argonne National Laboratory  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sensors and Materials Argonne uses its materials and engineering expertise to develop, test, and deploy sensors and materials to detect nuclear and radiological materials, chemical...

233

6189-47, Session 10 Optical spatial filtering velocimetry sensor for real-time  

E-Print Network [OSTI]

transforming system instead, the sensor will allow measurement of rotational vibration without direct6189-47, Session 10 Optical spatial filtering velocimetry sensor for real-time in-plane vibration-contact, low-cost optical sensor for real time detection and active vibration control of mechanical devices

234

Method of making active magnetic refrigerant materials based on Gd-Si-Ge alloys  

DOE Patents [OSTI]

An alloy made of heat treated material represented by Gd.sub.5(Si.sub.xGe.sub.1-x).sub.4 where 0.47.ltoreq.x.ltoreq.0.56 that exhibits a magnetic entropy change (-.DELTA.S.sub.m) of at least 16 J/kg K, a magnetostriction of at least 2000 parts per million, and a magnetoresistance of at least 5 percent at a temperature of about 300K and below, and method of heat treating the material between 800 to 1600 degrees C. for a time to this end.

Pecharsky, Alexandra O. (Ames, IA); Gschneidner, Jr., Karl A. (Ames, IA); Pecharsky, Vitalij K. (Ames, IA)

2006-10-03T23:59:59.000Z

235

Report on Non-Contact DC Electric Field Sensors  

SciTech Connect (OSTI)

This document reports on methods used to measure DC electrostatic fields in the range of 100 to 4000 V/m using a non-contact method. The project for which this report is written requires this capability. Non-contact measurements of DC fields is complicated by the effect of the accumulation of random space-charges near the sensors which interfere with the measurement of the field-of-interest and consequently, many forms of field measurements are either limited to AC measurements or use oscillating devices to create pseudo-AC fields. The intent of this document is to report on methods discussed in the literature for non-contact measurement of DC fields. Electric field meters report either the electric field expressed in volts per distance or the voltage measured with respect to a ground reference. Common commercial applications for measuring static (DC) electric fields include measurement of surface charge on materials near electronic equipment to prevent arcing which can destroy sensitive electronic components, measurement of the potential for lightning to strike buildings or other exposed assets, measurement of the electric fields under power lines to investigate potential health risks from exposure to EM fields and measurement of fields emanating from the brain for brain diagnostic purposes. Companies that make electric field sensors include Trek (Medina, NY), MKS Instruments, Boltek, Campbell Systems, Mission Instruments, Monroe Electronics, AlphaLab, Inc. and others. In addition to commercial vendors, there are research activities continuing in the MEMS and optical arenas to make compact devices using the principles applied to the larger commercial sensors.

Miles, R; Bond, T; Meyer, G

2009-06-16T23:59:59.000Z

236

Thin-film fiber optic hydrogen and temperature sensor system  

DOE Patents [OSTI]

The invention discloses a sensor probe device for monitoring of hydrogen gas concentrations and temperatures by the same sensor probe. The sensor probe is constructed using thin-film deposition methods for the placement of a multitude of layers of materials sensitive to hydrogen concentrations and temperature on the end of a light transparent lens located within the sensor probe. The end of the lens within the sensor probe contains a lens containing a layer of hydrogen permeable material which excludes other reactive gases, a layer of reflective metal material that forms a metal hydride upon absorbing hydrogen, and a layer of semi-conducting solid that is transparent above a temperature dependent minimum wavelength for temperature detection. The three layers of materials are located at the distal end of the lens located within the sensor probe. The lens focuses light generated by broad-band light generator and connected by fiber-optics to the sensor probe, onto a reflective metal material layer, which passes through the semi-conducting solid layer, onto two optical fibers located at the base of the sensor probe. The reflected light is transmitted over fiber optic cables to a spectrometer and system controller. The absence of electrical signals and electrical wires in the sensor probe provides for an elimination of the potential for spark sources when monitoring in hydrogen rich environments, and provides a sensor free from electrical interferences. 3 figs.

Nave, S.E.

1998-07-21T23:59:59.000Z

237

Thin-film tin oxide??ethanol sensor  

Science Journals Connector (OSTI)

Tin Oxide (SnO2) thin films grown on glass substrate at 648 K using direct evaporation method with two gold pads deposited on the top for electrical contacts were exposed to ethanol vapours (200-1000 ppm). The operating temperature of the sensor was optimised. The sensitivity variation of films having different thicknesses was studied. To improve the sensitivity and selectivity further, a thin layer of metal oxide was deposited on the sensor surface to work as a catalytic layer and its effect on the performance of the sensor was studied. The response and recovery times of the sensor were determined.

H.J. Pandya

2009-01-01T23:59:59.000Z

238

Fiber optic hydrogen sensor  

DOE Patents [OSTI]

An apparatus and method for detecting a chemical substance by exposing an optic fiber having a core and a cladding to the chemical substance so that the chemical substance can be adsorbed onto the surface of the cladding. The optic fiber is coiled inside a container having a pair of valves for controlling the entrance and exit of the substance. Light from a light source is received by one end of the optic fiber, preferably external to the container, and carried by the core of the fiber. Adsorbed substance changes the transmissivity of the fiber as measured by a spectrophotometer at the other end, also preferably external to the container. Hydrogen is detected by the absorption of infrared light carried by an optic fiber with a silica cladding. Since the adsorption is reversible, a sensor according to the present invention can be used repeatedly. Multiple positions in a process system can be monitored using a single container that can be connected to each location to be monitored so that a sample can be obtained for measurement, or, alternatively, containers can be placed near each position and the optic fibers carrying the partially-absorbed light can be multiplexed for rapid sequential reading by a single spectrophotometer.

Buchanan, Bruce R. (1985 Willis, Batesburg, SC 29006); Prather, William S. (2419 Dickey Rd., Augusta, GA 30906)

1992-01-01T23:59:59.000Z

239

Fiber optic hydrogen sensor  

DOE Patents [OSTI]

Apparatus and method for detecting a chemical substance by exposing an optic fiber having a core and a cladding to the chemical substance so that the chemical substance can be adsorbed onto the surface of the cladding. The optic fiber is coiled inside a container having a pair of valves for controlling the entrance and exit of the substance. Light from a light source is received by one end of the optic fiber, preferably external to the container, and carried by the core of the fiber. Adsorbed substance changes the transmissivity of the fiber as measured by a spectrophotometer at the other end, also preferably external to the container. Hydrogen is detected by the absorption of infrared light carried by an optic fiber with a silica cladding. Since the adsorption is reversible, a sensor according to the present invention can be used repeatedly. Multiple positions in a process system can be monitored using a single container that can be connected to each location to be monitored so that a sample can be obtained for measurement, or, alternatively, containers can be placed near each position and the optic fibers carrying the partially-absorbed light can be multiplexed for rapid sequential reading, by a single spectrophotometer.

Buchanan, B.R.; Prather, W.S.

1991-01-01T23:59:59.000Z

240

Fiber optic hydrogen sensor  

DOE Patents [OSTI]

An apparatus and method are described for detecting a chemical substance by exposing an optic fiber having a core and a cladding to the chemical substance so that the chemical substance can be adsorbed onto the surface of the cladding. The optic fiber is coiled inside a container having a pair of valves for controlling the entrance and exit of the substance. Light from a light source is received by one end of the optic fiber, preferably external to the container, and carried by the core of the fiber. Adsorbed substance changes the transmissivity of the fiber as measured by a spectrophotometer at the other end, also preferably external to the container. Hydrogen is detected by the absorption of infrared light carried by an optic fiber with a silica cladding. Since the adsorption is reversible, a sensor according to the present invention can be used repeatedly. Multiple positions in a process system can be monitored using a single container that can be connected to each location to be monitored so that a sample can be obtained for measurement, or, alternatively, containers can be placed near each position and the optic fibers carrying the partially-absorbed light can be multiplexed for rapid sequential reading by a single spectrophotometer. 4 figs.

Buchanan, B.R.; Prather, W.S.

1992-10-06T23:59:59.000Z

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


241

Implementing a green bicycle alliance using a wireless sensor network  

Science Journals Connector (OSTI)

This study used the wireless sensor network (WSN) technique to design a bike device module, a bike path establishment module and a cloud service module. These three modules were used to address issues related to cycling activities, including green power ...

Haw-Yun Shin; Chung-Ming Own

2014-08-01T23:59:59.000Z

242

Electrochemical micro sensor  

DOE Patents [OSTI]

A micro-amperometric electrochemical sensor for detecting the presence of a pre-determined species in a fluid material is disclosed. The sensor includes a smooth substrate having a thin coating of solid electrolytic material deposited thereon. The working and counter electrodes are deposited on the surface of the solid electrolytic material and adhere thereto. Electrical leads connect the working and counter electrodes to a potential source and an apparatus for measuring the change in an electrical signal caused by the electrochemical oxidation or reduction of the species. Alternatively, the sensor may be fabricated in a sandwich structure and also may be cylindrical, spherical or other shapes.

Setter, Joseph R. (Naperville, IL); Maclay, G. Jordan (Maywood, IL)

1989-09-12T23:59:59.000Z

243

RF current sensor  

DOE Patents [OSTI]

An RF sensor having a novel current sensing probe and a voltage sensing probe to measure voltage and current. The current sensor is disposed in a transmission line to link all of the flux generated by the flowing current in order to obtain an accurate measurement. The voltage sensor is a flat plate which operates as a capacitive plate to sense voltage on a center conductor of the transmission line, in which the measured voltage is obtained across a resistance leg of a R-C differentiator circuit formed by the characteristic impedance of a connecting transmission line and a capacitance of the plate, which is positioned proximal to the center conductor.

Moore, James A. (Powell, TN); Sparks, Dennis O. (Maryville, TN)

1998-11-10T23:59:59.000Z

244

Future Directions for Magnetic Sensors  

E-Print Network [OSTI]

Future Directions for Magnetic Sensors: HYBRIDMATERIALS Our goal is to develop the scientific expertise needed to allow modeling and simulation to become the driving force in improving magnetic sensors effectiveness in developing new and improved magnetic sensors. By quantifying the improvement in sensor

245

Movement behaviour of traditionally managed cattle in the Eastern Province of Zambia: investigations using two-dimensional motion sensors  

E-Print Network [OSTI]

Two-dimensional (2-D) motion sensors are activity motion sensors that use electronic accelerometers to record the lying, standing and walking behaviour of animals. They were used in this study with the aim of monitoring and quantifying the movement...

Lubaba, Caesar Himbayi

2011-06-27T23:59:59.000Z

246

Using Micro-Genetic Algorithms to Improve Localization in Wireless Sensor Networks  

E-Print Network [OSTI]

Using Micro-Genetic Algorithms to Improve Localization in Wireless Sensor Networks Vincent Tam methods, micro- genetic algorithms, distance measures. I. INTRODUCTION A wireless sensor network of Hong Kong, Hong Kong. Email: {vtam, kycheng, kslui}@eee.hku.hk Abstract-- Wireless sensor networks

Tam, Vincent W. L.

247

Object-level fusion and confidence management in a multi-sensor pedestrian tracking system  

E-Print Network [OSTI]

-sensor fusion system dedicated to detect, recognize and track pedestrians. The fusion by tracking method is used multi-sensor pedes- trian detection, recognition and tracking system, is introduced. However, sensors and estimate vehicle and pedestrians' kinematical state. Section IV presents the detection and recogni- tion

Paris-Sud XI, Université de

248

Rotation estimation for a satellite from Sun sensors Lionel Magnis Nicolas Petit  

E-Print Network [OSTI]

of the angle of incidence of solar radiation, the output signal of a Sun sensor is, roughly speaking, a cosineRotation estimation for a satellite from Sun sensors Lionel Magnis Nicolas Petit Abstract-- We develop a method to reconstruct the rotation motion of a satellite from Sun sensor measurements. Mathe

249

An Asynchronous Event-Driven Data Transmitter for Wireless ECG Sensor Nodes  

E-Print Network [OSTI]

An Asynchronous Event-Driven Data Transmitter for Wireless ECG Sensor Nodes Andre L. Mansano for wireless ECG sensors node. Unlike current solutions for ECG monitoring with autonomous wireless sensors, we propose an asynchronous method to transmit data from an ECG front-end, which is designed with a 2-bit

Serdijn, Wouter A.

250

Complex pendulum biomass sensor  

DOE Patents [OSTI]

A complex pendulum system biomass sensor having a plurality of pendulums. The plurality of pendulums allow the system to detect a biomass height and density. Each pendulum has an angular deflection sensor and a deflector at a unique height. The pendulums are passed through the biomass and readings from the angular deflection sensors are fed into a control system. The control system determines whether adjustment of machine settings is appropriate and either displays an output to the operator, or adjusts automatically adjusts the machine settings, such as the speed, at which the pendulums are passed through the biomass. In an alternate embodiment, an entanglement sensor is also passed through the biomass to determine the amount of biomass entanglement. This measure of entanglement is also fed into the control system.

Hoskinson, Reed L. (Rigby, ID); Kenney, Kevin L. (Idaho Falls, ID); Perrenoud, Ben C. (Rigby, ID)

2007-12-25T23:59:59.000Z

251

NOx Sensor Development  

Broader source: Energy.gov (indexed) [DOE]

needed to meet emission targets and enable widespread use of diesel vehicles with better fuel economies: We are developing a novel sensor with the potential to meet OEM cost and...

252

Microbend fiber-optic chemical sensor  

DOE Patents [OSTI]

A microbend fiber-optic chemical sensor for detecting chemicals in a sample, and a method for its use, is disclosed. The sensor comprises at least one optical fiber having a microbend section (a section of small undulations in its axis), for transmitting and receiving light. In transmission, light guided through the microbend section scatters out of the fiber core and interacts, either directly or indirectly, with the chemical in the sample, inducing fluorescence radiation. Fluorescence radiation is scattered back into the microbend section and returned to an optical detector for determining characteristics of the fluorescence radiation quantifying the presence of a specific chemical.

Weiss, Jonathan D. (Albuquerque, NM)

2002-01-01T23:59:59.000Z

253

activities  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Detecting Things We Cannot See: Learning the Concepts of Control and Detecting Things We Cannot See: Learning the Concepts of Control and Variable in an Experiment Submitted by Anita Brook-Dupree, 1996 TRAC teacher at Fermilab, Teacher, Alternative Middle Years School, Philadelphia, PA. Particle physicists at Fermilab in Batavia, Illinois are faced with the problem of detecting the presence of sub-atomic particles they cannot see. During my summer as a TRAC teacher at Fermilab, I tried to think of ways to teach middle school students about things we cannot see. I want to thank my nine-year-old daughter Gia for the idea for the following activity. I was lamenting that I could not come up with ideas of how to relate the work of Fermilab scientists to anything that my students would understand. Then I was reminded by my daughter, that when I brought her to school on the

254

Method of making active magnetic refrigerant, colossal magnetostriction and giant magnetoresistive materials based on Gd-Si-Ge alloys  

DOE Patents [OSTI]

Method of making an active magnetic refrigerant represented by Gd.sub.5 (Si.sub.x Ge.sub.1-x).sub.4 alloy for 0.ltoreq.x.ltoreq.1.0 comprising placing amounts of the commercially pure Gd, Si, and Ge charge components in a crucible, heating the charge contents under subambient pressure to a melting temperature of the alloy for a time sufficient to homogenize the alloy and oxidize carbon with oxygen present in the Gd charge component to reduce carbon, rapidly solidifying the alloy in the crucible, and heat treating the solidified alloy at a temperature below the melting temperature for a time effective to homogenize a microstructure of the solidified material, and then cooling sufficiently fast to prevent the eutectoid decomposition and improve magnetocaloric and/or the magnetostrictive and/or the magnetoresistive properties thereof.

Gschneidner, Jr., Karl A. (Ames, IA); Pecharsky, Alexandra O. (Ames, IA); Pecharsky, Vitalij K. (Ames, IA)

2003-07-08T23:59:59.000Z

255

MULTIPLE SENSOR PERIODIC NONDESTRUCTIVE EVALUATION OF A CONCRETE BRIDGE DECK  

E-Print Network [OSTI]

decades, various non- destructive evaluation (NDE) techniques and methods emerged; some of them have been of the art and advanced methods at the US FHWA NDE Center. 2. BRIEF INTRODUCTION OF INVOLVED NONDESTRUCTIVE, GPR, anode ladder sensor and ultrasonic methods are primary NDE and monitoring methods that were

Huston, Dryver R.

256

Sensor Characteristics Reference Guide  

SciTech Connect (OSTI)

The Buildings Technologies Office (BTO), within the U.S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy (EERE), is initiating a new program in Sensor and Controls. The vision of this program is: Buildings operating automatically and continuously at peak energy efficiency over their lifetimes and interoperating effectively with the electric power grid. Buildings that are self-configuring, self-commissioning, self-learning, self-diagnosing, self-healing, and self-transacting to enable continuous peak performance. Lower overall building operating costs and higher asset valuation. The overarching goal is to capture 30% energy savings by enhanced management of energy consuming assets and systems through development of cost-effective sensors and controls. One step in achieving this vision is the publication of this Sensor Characteristics Reference Guide. The purpose of the guide is to inform building owners and operators of the current status, capabilities, and limitations of sensor technologies. It is hoped that this guide will aid in the design and procurement process and result in successful implementation of building sensor and control systems. DOE will also use this guide to identify research priorities, develop future specifications for potential market adoption, and provide market clarity through unbiased information

Cree, Johnathan V.; Dansu, A.; Fuhr, P.; Lanzisera, Steven M.; McIntyre, T.; Muehleisen, Ralph T.; Starke, M.; Banerjee, Pranab; Kuruganti, T.; Castello, C.

2013-04-01T23:59:59.000Z

257

Customizable embedded sensors via additive manufacturing for monitoring in medical applications.  

E-Print Network [OSTI]

??The research presented investigates a new method and design of embedded sensors for medical applications using an injected piezoresistive elastomer inside a structure built using (more)

Ranky, Richard G.

2012-01-01T23:59:59.000Z

258

Distributed target tracking and boundary estimation in wireless sensor networks  

Science Journals Connector (OSTI)

We study the problem of target tracking and boundary detection of a substance diffusing from a mobile source using a wireless sensor network. We present a Prediction-based Mobility Adaptive Tracking (P-MAT algorithm to study the tradeoff among energy, accuracy of tracking, coverage and boundary estimation. P-MAT minimises overall energy consumption by incorporating adaptivity in two forms: (1) the size of the active region and (2) modulation of the sampling rate. It uses adaptive Kalman filtering to predict the target's future location and velocity. The predicted target location determines a set of sensors surrounding that location to be activated known as the active region. Sensors in the active region are responsible for target tracking and boundary detection. In this article, we include dynamic boundary estimation. Boundary estimation in many situations can be performed efficiently using a subset of nodes within the vicinity of the phenomenon. This subset of nodes in our algorithm is the set of nodes in the active region. As the substance spreads, sensors in the active region determine if additional sensors outside of the active region are needed to enclose the boundary. Results from simulation experiments show that P-MAT can perform both tracking and boundary.

Jennifer Yick; Biswanath Mukherjee; Dipak Ghosal

2008-01-01T23:59:59.000Z

259

Wireless Sensor Network Fundamentals  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Wireless Sensor Network Fundamentals Wireless Sensor Network Fundamentals Speaker(s): Steven Lanzisera Date: February 8, 2010 - 12:00pm Location: 90-3122 Seminar Host/Point of Contact: Kevin Kircher Wireless sensor networks have been promising to provide easy data collection and control capability to applications ranging from scientific data collection, disaster recover, national security, and more. The user experience, however, has been filled with confusing terminology, complicated systems, and a lack of interoperability between vendors. Users with a background in the technology and fundamentals are better able to understand system capabilities, make decisions, and end up with a network that meets their needs. Although a sufficient coverage of this topic is at least a semester course, the goal of this talk is to give a brief

260

Chemiresistor urea sensor  

DOE Patents [OSTI]

A sensor to detect and quantify urea in fluids resulting from hemodialysis procedures, and in blood and other body fluids. The sensor is based upon a chemiresistor, which consists of an interdigitated array of metal fingers between which a resistance measured. The interdigitated array is fabricated on a suitable substrate. The surface of the array of fingers is covered with a coating containing the enzyme urease which catalyzes the hydrolysis of urea to form the ammonium ion, the bicarbonate ion, and hydroxide-chemical products which provide the basis for the measured signal. In a typical application, the sensor could be used at bedside, in conjunction with an appropriate electronics/computer system, in order to determine the hemodialysis endpoint. Also, the chemiresistor used to detect urea, can be utilized with a reference chemiresistor which does not contain urease, and connected in a differential measurement arrangement, such that the reference chemiresistor would cancel out any fluctuations due to background effects.

Glass, Robert S. (Livermore, CA)

1997-01-01T23:59:59.000Z

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


261

Optical displacement sensor  

DOE Patents [OSTI]

An optical displacement sensor is disclosed which uses a vertical-cavity surface-emitting laser (VCSEL) coupled to an optical cavity formed by a moveable membrane and an output mirror of the VCSEL. This arrangement renders the lasing characteristics of the VCSEL sensitive to any movement of the membrane produced by sound, vibrations, pressure changes, acceleration, etc. Some embodiments of the optical displacement sensor can further include a light-reflective diffractive lens located on the membrane or adjacent to the VCSEL to control the amount of lasing light coupled back into the VCSEL. A photodetector detects a portion of the lasing light from the VCSEL to provide an electrical output signal for the optical displacement sensor which varies with the movement of the membrane.

Carr, Dustin W. (Albuquerque, NM)

2008-04-08T23:59:59.000Z

262

Fiber optic vibration sensor  

DOE Patents [OSTI]

A fiber optic vibration sensor utilizes two single mode optical fibers supported by a housing with one optical fiber fixedly secured to the housing and providing a reference signal and the other optical fiber having a free span length subject to vibrational displacement thereof with respect to the housing and the first optical fiber for providing a signal indicative of a measurement of any perturbation of the sensor. Damping or tailoring of the sensor to be responsive to selected levels of perturbation is provided by altering the diameter of optical fibers or by immersing at least a portion of the free span length of the vibration sensing optical fiber into a liquid of a selected viscosity.

Dooley, Joseph B. (Harriman, TN); Muhs, Jeffrey D. (Lenoir City, TN); Tobin, Kenneth W. (Harriman, TN)

1995-01-01T23:59:59.000Z

263

Capacitive proximity sensor  

DOE Patents [OSTI]

A proximity sensor based on a closed field circuit. The circuit comprises a ring oscillator using a symmetrical array of plates that creates an oscillating displacement current. The displacement current varies as a function of the proximity of objects to the plate array. Preferably the plates are in the form of a group of three pair of symmetric plates having a common center, arranged in a hexagonal pattern with opposing plates linked as a pair. The sensor produces logic level pulses suitable for interfacing with a computer or process controller. The proximity sensor can be incorporated into a load cell, a differential pressure gauge, or a device for measuring the consistency of a characteristic of a material where a variation in the consistency causes the dielectric constant of the material to change.

Kronberg, James W. (Aiken, SC)

1994-01-01T23:59:59.000Z

264

Fiber optic vibration sensor  

DOE Patents [OSTI]

A fiber optic vibration sensor utilizes two single mode optical fibers supported by a housing with one optical fiber fixedly secured to the housing and providing a reference signal and the other optical fiber having a free span length subject to vibrational displacement thereof with respect to the housing and the first optical fiber for providing a signal indicative of a measurement of any perturbation of the sensor. Damping or tailoring of the sensor to be responsive to selected levels of perturbation is provided by altering the diameter of optical fibers or by immersing at least a portion of the free span length of the vibration sensing optical fiber into a liquid of a selected viscosity. 2 figures.

Dooley, J.B.; Muhs, J.D.; Tobin, K.W.

1995-01-10T23:59:59.000Z

265

CHEMICAL SENSORS School of Chemistry and Biochemistry  

E-Print Network [OSTI]

CHEMICAL SENSORS CHEM 6282 School of Chemistry and Biochemistry Chemical sensors theory of chemical recognition, electrochemical, optical, mass sensors and data reduction. Text: J. Janata, "Principles of Chemical Sensors", 2010 Springer NOTE: GT Library purchased an e

Sherrill, David

266

Magnetic differential torque sensor  

SciTech Connect (OSTI)

A new torque sensor structure is presented. The basic idea is a simple torque sensor with a variable magnetic circuit excited by an axially magnetized permanent magnet ring. The circuit is constituted by iron toothed rings, whose teeth relative position changes whenever an applied torque twists the rotating shaft. A Hall probe measures the induction in an airgap where the induction is uniform. The new structure is an association of two previous ones, thus creating a differential system with the related advantages: diminution of thermal drifts, zero mean value for the signal. The new magnetic circuit is studied by calculating equivalent reluctances through energy calculations and by using electrical analogies.

Lemarquand, V.; Lemarquand, G. [Univ. de Savoie, Annecy-le-Vieux (France)] [Univ. de Savoie, Annecy-le-Vieux (France)

1995-11-01T23:59:59.000Z

267

Fluorescent temperature sensor  

DOE Patents [OSTI]

The present invention is a fluorescent temperature sensor or optical thermometer. The sensor includes a solution of 1,3-bis(1-pyrenyl)propane within a 1-butyl-1-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ionic liquid solvent. The 1,3-bis(1-pyrenyl)propane remains unassociated when in the ground state while in solution. When subjected to UV light, an excited state is produced that exists in equilibrium with an excimer. The position of the equilibrium between the two excited states is temperature dependent.

Baker, Gary A [Los Alamos, NM; Baker, Sheila N [Los Alamos, NM; McCleskey, T Mark [Los Alamos, NM

2009-03-03T23:59:59.000Z

268

Sensors as Information Transducers  

E-Print Network [OSTI]

This chapter reviews the mechanisms by which sensors gather information from the physical world and transform it into the electronic signals that are used in today's information and control systems. It introduces a new methodology for describing sensing mechanisms based on the process of information flow and applies it to the broad spectrum of sensors, instruments and data input devices in current use. We identify four distinct elemental transduction processes: energy conversion, energy dispersion, energy modulation and modulation of a material property. We posit that these four mechanisms form a complete set for describing information transduction in sensing systems.

J. David zook; Norbert Schroeder

2008-04-04T23:59:59.000Z

269

Thin film hydrogen sensor  

DOE Patents [OSTI]

A hydrogen sensor element comprises an essentially inert, electrically-insulating substrate having a thin-film metallization deposited thereon which forms at least two resistors on the substrate. The metallization comprises a layer of Pd or a Pd alloy for sensing hydrogen and an underlying intermediate metal layer for providing enhanced adhesion of the metallization to the substrate. An essentially inert, electrically insulating, hydrogen impermeable passivation layer covers at least one of the resistors, and at least one of the resistors is left uncovered. The difference in electrical resistances of the covered resistor and the uncovered resistor is related to hydrogen concentration in a gas to which the sensor element is exposed.

Lauf, Robert J. (Oak Ridge, TN); Hoffheins, Barbara S. (Knoxville, TN); Fleming, Pamela H. (Oak Ridge, TN)

1994-01-01T23:59:59.000Z

270

Intrinsic Fabry-Perot optical fiber sensors and their multiplexing  

DOE Patents [OSTI]

An intrinsic Fabry-Perot optical sensor includes a thin film sandwiched between two fiber ends. When light is launched into the fiber, two reflections are generated at the two fiber/thin film interfaces due to a difference in refractive indices between the fibers and the film, giving rise to the sensor output. In another embodiment, a portion of the cladding of a fiber is removed, creating two parallel surfaces. Part of the evanescent fields of light propagating in the fiber is reflected at each of the surfaces, giving rise to the sensor output. In a third embodiment, the refractive index of a small portion of a fiber is changed through exposure to a laser beam or other radiation. Interference between reflections at the ends of the small portion give rise to the sensor output. Multiple sensors along a single fiber are multiplexed using an optical time domain reflectometry method.

Wang, Anbo (Blacksburg, VA)

2007-12-11T23:59:59.000Z

271

Advanced Sensors and Instrumentation Newsletter  

Broader source: Energy.gov [DOE]

The Advanced Sensors and Instrumentation (ASI) newsletter will be released periodically to inform program stakeholders about new developments and achievements in the area of sensors, instrumentation and related technologies across the Office of Nuclear Energy (NE) R&D programs.

272

Controlled mobility in sensor networks  

E-Print Network [OSTI]

K. Gupta. Optimizing energy-latency trade- o? in sensoras Optimizing Energy-Latency Trade-o? in Sensor NetworksK. Gupta, Optimizing Energy-Latency Trade-o? in Sensor

Sugihara, Ryo

2009-01-01T23:59:59.000Z

273

Nanotechnology-Based Electrochemical Sensors for Biomonitoring...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nanotechnology-Based Electrochemical Sensors for Biomonitoring Chemical Exposures . Nanotechnology-Based Electrochemical Sensors for Biomonitoring Chemical Exposures . Abstract:...

274

Lighting Controls/Sensors | Open Energy Information  

Open Energy Info (EERE)

Lighting ControlsSensors Incentives Retrieved from "http:en.openei.orgwindex.php?titleLightingControlsSensors&oldid267...

275

Studying Altocumulus Plus Virga with Ground-based Active and Passive Remote Sensors Zhien Wang1, Kenneth Sassen2, David Whiteman3, and Belay Demoz3 1University of Maryland, Baltimore County, Catonsville, MD 21228 2University of Alaska, Fairbanks, Alaska 99775 3NASA Goddard Space Flight Center, Greenbelt, MD 20771 E-mail: zhien@agnes.gsfc.nasa.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Seasonal and Interannual Variations of Boundary-layer Mixed-phase Seasonal and Interannual Variations of Boundary-layer Mixed-phase Cloud Properties Observed at the ARCF NSA site Zhien Wang, Ming Zhao, and Min Deng University of Wyoming , Laramie, Wyoming, 82071, zwang@uwyo.edu References Curry, J. et al., 1996: Overview of Arctic cloud and radiation characteristics. J. Climate., 9, 1731-1764. Wang, Z. and K. Sassen, 2002: Cirrus cloud microphysical property retrieval using lidar and radar measurements, I: algorithm description and comparison with in situ data. J. Appl. Meteor., 41, 218-229. Wang, Z., K. Sassen, D. Whiteman, and B. Demoz, 2004: Studying altocumulus plus virga with ground-based active and passive remote sensors. J. Appl. Meteor.,43, 449-460. Wang, Z., 2007: Refined Two-channel Microwave Radiometer Liquid Water Path Retrieval at Cold Regions by Using Multiple-sensor Measurements. IEEE Geoscience and Remote

276

Low-Cost Spectral Sensor Development Description.  

SciTech Connect (OSTI)

Solar spectral data for all parts of the US is limited due in part to the high cost of commercial spectrometers. Solar spectral information is necessary for accurate photovoltaic (PV) performance forecasting, especially for large utility-scale PV installations. A low-cost solar spectral sensor would address the obstacles and needs. In this report, a novel low-cost, discrete- band sensor device, comprised of five narrow-band sensors, is described. The hardware is comprised of commercial-off-the-shelf components to keep the cost low. Data processing algorithms were developed and are being refined for robustness. PV module short-circuit current ( I sc ) prediction methods were developed based on interaction-terms regression methodology and spectrum reconstruction methodology for computing I sc . The results suggest the computed spectrum using the reconstruction method agreed well with the measured spectrum from the wide-band spectrometer (RMS error of 38.2 W/m 2 -nm). Further analysis of computed I sc found a close correspondence of 0.05 A RMS error. The goal is for ubiquitous adoption of the low-cost spectral sensor in solar PV and other applications such as weather forecasting.

Armijo, Kenneth Miguel; Yellowhair, Julius

2014-11-01T23:59:59.000Z

277

Using Sensor Technology to Augment Traditional Healthcare Marilyn J. Rantz, Marjorie Skubic, Member, IEEE and Steven J. Miller  

E-Print Network [OSTI]

motion, door sensors and load cells on the bed [4]. A monitoring system of 8 passive motion sensors mixture model analysis [5]. Another pilot study used motion and door sensors to extract a 24 hour activity profile; an alert could be generated if newly logged data deviated from the stored profile [6]. Heart

He, Zhihai "Henry"

278

Robust and distributed range-free localization using anchor nodes with varying communication range for three dimensional wireless sensor networks  

Science Journals Connector (OSTI)

Localization of the nodes in a sensor network is a premier activity which influences the performance of the network. The data collected by a sensor node may become useless if the location of that node is not known. Sensor networks are mostly deployed ...

Manas Kumar Mishra; M. M. Gore

2011-02-01T23:59:59.000Z

279

Ultrafast Graphene Oxide Humidity Sensors  

Science Journals Connector (OSTI)

Ultrafast Graphene Oxide Humidity Sensors ... Graphene oxide can be exploited in humidity and temperature sensors with a number of convenient features such as flexibility, transparency and suitability for large-scale manufacturing. ... Here we show that the two-dimensional nature of graphene oxide and its superpermeability to water combine to enable humidity sensors with unprecedented response speed (?30 ms response and recovery times). ...

Stefano Borini; Richard White; Di Wei; Michael Astley; Samiul Haque; Elisabetta Spigone; Nadine Harris; Jani Kivioja; Tapani Ryhnen

2013-11-09T23:59:59.000Z

280

Shape memory alloy thaw sensors  

DOE Patents [OSTI]

A sensor permanently indicates that it has been exposed to temperatures exceeding a critical temperature for a predetermined time period. An element of the sensor made from shape memory alloy changes shape when exposed, even temporarily, to temperatures above the Austenitic temperature of the shape memory alloy. The shape change of the SMA element causes the sensor to change between two readily distinguishable states.

Shahinpoor, Mohsen (Albuquerque, NM); Martinez, David R. (Albuquerque, NM)

1998-01-01T23:59:59.000Z

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


281

A variety of neutron sensors based on scintillating glass waveguides  

SciTech Connect (OSTI)

Pacific Northwest Laboratory (PNL) has fabricated cerium-activated, lithium-silicate glass scintillating fiber neutron sensors via a hot-downdraw process. These fibers typically have a transmission length (e{sup {minus}1} length) of greater than 2 meters. The underlying physics of, the properties of, and selected devices incorporating these fibers are described. These fibers constitute an enabling technology for a wide variety of neutron sensors.

Bliss, M.; Craig, R.A.

1995-05-01T23:59:59.000Z

282

Wireless sensor node localization  

Science Journals Connector (OSTI)

...need to be asymmetrical, with small, passive sensor nodes listening for signals from one or more larger transmitters. The fact...is dropping. For example, the $600 MEMS-based analogue device ADIS16360 unit has a tri-axis accelerometer and a tri-axis...

2012-01-01T23:59:59.000Z

283

Precision liquid level sensor  

DOE Patents [OSTI]

A precision liquid level sensor utilizes a balanced R. F. bridge, each arm including an air dielectric line. Changes in liquid level along one air dielectric line imbalance the bridge and create a voltage which is directly measurable across the bridge.

Field, Michael E. (Albuquerque, NM); Sullivan, William H. (Albuquerque, NM)

1985-01-01T23:59:59.000Z

284

Thick film hydrogen sensor  

DOE Patents [OSTI]

A thick film hydrogen sensor element includes an essentially inert, electrically-insulating substrate having deposited thereon a thick film metallization forming at least two resistors. The metallization is a sintered composition of Pd and a sinterable binder such as glass frit. An essentially inert, electrically insulating, hydrogen impermeable passivation layer covers at least one of the resistors. 8 figs.

Hoffheins, B.S.; Lauf, R.J.

1995-09-19T23:59:59.000Z

285

Development of an Acoustic Sensor On-Line Gas Temperature Measurement in Gasifiers  

SciTech Connect (OSTI)

This project was awarded under U.S. Department of Energy (DOE) National Energy Technology Laboratory (NETL) Program Solicitation DE-PS26-02NT41422 and specifically addresses Technical Topical Area 2 - Gasification Technologies. The project team includes Enertechnix, Inc. as the main contractor and ConocoPhillips Company as a technical partner, who also provides access to the SG Solutions Gasification Facility (formerly Wabash River Energy Limited), host for the field-testing portion of the research. The objective of this project was to adapt acoustic pyrometer technology to make it suitable for measuring gas temperature inside a coal gasifier, to develop a prototype sensor based on this technology, and to demonstrate its performance through testing on a commercial gasifier. The project was organized in three phases, each of approximately one year duration. The first phase consisted of researching a variety of sound generation and coupling approaches suitable for use with a high pressure process, evaluation of the impact of gas composition variability on the acoustic temperature measurement approach, evaluation of the impact of suspended particles and gas properties on sound attenuation, evaluation of slagging issues and development of concepts to deal with this issue, development and testing of key prototype components to allow selection of the best approaches, and development of a conceptual design for a field prototype sensor that could be tested on an operating gasifier. The second phase consisted of designing and fabricating a series of prototype sensors, testing them in the laboratory, and developing a conceptual design for a field prototype sensor. The third phase consisted of designing and fabricating the field prototype, and testing it in the lab and in a commercial gasifier to demonstrate the ability to obtain accurate measurements of gas temperature in an operating gasifier. Following the completion of the initial 3 year project, several continuations were awarded by the Department of Energy to allow Enertechnix to conduct extended testing of the sensor at the Wabash River facility. In February, 2008 the sensor was installed on the gasifier in preparation for a long-term test. During the initial testing of the sensor a stainless steel tube on the sensor failed and allowed syngas to escape. The syngas self-ignited and the ensuing small fire damaged some of the components on the sensor. There was no damage to the gasifier or other equipment and no injuries resulted from this incident. Two meetings were held to identify the root causes of the incident-one at Wabash River and one at Enertechnix. A list of recommended improvements that would have addressed the causes of the incident was created and presented to the Department of Energy on May 2, 2008. However, the DOE decided not to pursue these improvements and terminated the project. This report describes all of the activities conducted during the project and reports the findings of each activity in detail. The investigation of potential sound generation and coupling methods led to the selection of a reflected shock method which has been developed into a functioning prototype device. The principles of operation of this device and its performance characteristics are described in the report. Modeling of the attenuation of sound by suspended particles and by interaction of the sound pulses with the high temperature syngas inside the gasifier was conducted and the predictions of those models were used to determine the required sound pulse intensity to allow the sound pulses to be detected after passage through the gasifier environment. These modeling results are presented in this report. A study of the likely spatial and temporal variability of gas composition inside the gasifier was performed and the results of that study was used to predict the impact of that variability on the accuracy of the acoustic temperature method. These results are reported here. A design for a port rodding mechanism was developed to deal with potential slagging issues and was incorporated i

Peter Ariessohn

2008-06-30T23:59:59.000Z

286

Intelligent Sensor Validation and Fusion with distributed "MEMS Dust" Sensors Shijun Qiu*  

E-Print Network [OSTI]

Intelligent Sensor Validation and Fusion with distributed "MEMS Dust" Sensors (Abstract) Shijun Qiu, Berkeley aagogino@euler.berkeley.edu Key Words : sensor networks, sensor fusion, sensor validation, micro-electromechanical systems, MEMS MEMS sensors make a rich design space of networked sensors viable. They can be deeply

Agogino, Alice M.

287

IN-LINE CHEMICAL SENSOR DEPLOYMENT IN A TRITIUM PLANT  

SciTech Connect (OSTI)

The Savannah River Tritium Plant (TP) relies on well understood but aging sensor technology for process gas analysis. Though new sensor technologies have been brought to various readiness levels, the TP has been reluctant to install technologies that have not been tested in tritium service. This gap between sensor technology development and incorporating new technologies into practical applications demonstrates fundamental challenges that exist when transitioning from status quo to state-of-the-art in an extreme environment such as a tritium plant. These challenges stem from three root obstacles: 1) The need for a comprehensive assessment of process sensing needs and requirements; 2) The lack of a pick-list of process-compatible sensor technologies; and 3) The need to test technologies in a tritium-contaminated process environment without risking production. At Savannah River, these issues are being addressed in a two phase project. In the first phase, TP sensing requirements were determined by a team of process experts. Meanwhile, Savannah River National Laboratory sensor experts identified candidate technologies and related them to the TP processing requirements. The resulting roadmap links the candidate technologies to actual plant needs. To provide accurate assessments of how a candidate sensor technology would perform in a contaminated process environment, an instrument demonstration station was established within a TP glove box. This station was fabricated to TP process requirements and designed to handle high activity samples. The combination of roadmap and demonstration station provides the following assets: ? Creates a partnership between the process engineers and researchers for sensor selection, maturation, and insertion, ? Selects the right sensors for process conditions ? Provides a means for safely inserting new sensor technology into the process without risking production, and ? Provides a means to evaluate off normal occurrences where and when they occur. This paper discusses the process to identify and demonstrate new sensor technologies for the Savannah River TP.

Tovo, L.; Wright, J.; Torres, R.; Peters, B.

2013-10-02T23:59:59.000Z

288

Remotely deployable aerial inspection using tactile sensors  

SciTech Connect (OSTI)

For structural monitoring applications, the use of remotely deployable Non-Destructive Evaluation (NDE) inspection platforms offer many advantages, including improved accessibility, greater safety and reduced cost, when compared to traditional manual inspection techniques. The use of such platforms, previously reported by researchers at the University Strathclyde facilitates the potential for rapid scanning of large areas and volumes in hazardous locations. A common problem for both manual and remote deployment approaches lies in the intrinsic stand-off and surface coupling issues of typical NDE probes. The associated complications of these requirements are obviously significantly exacerbated when considering aerial based remote inspection and deployment, resulting in simple visual techniques being the preferred sensor payload. Researchers at Bristol Robotics Laboratory have developed biomimetic tactile sensors modelled on the facial whiskers (vibrissae) of animals such as rats and mice, with the latest sensors actively sweeping their tips across the surface in a back and forth motion. The current work reports on the design and performance of an aerial inspection platform and the suitability of tactile whisking sensors to aerial based surface monitoring applications.

MacLeod, C. N.; Cao, J.; Pierce, S. G.; Dobie, G.; Summan, R. [Centre for Ultrasonic Engineering, University of Strathclyde, Glasgow, G1 1XW (United Kingdom); Sullivan, J. C.; Pipe, A. G. [Bristol Robotics Laboratory, University of the West of England, Bristol, BS16 1QY (United Kingdom)

2014-02-18T23:59:59.000Z

289

Hydrocarbon sensors and materials therefor  

DOE Patents [OSTI]

An electrochemical hydrocarbon sensor and materials for use in sensors. A suitable proton conducting electrolyte and catalytic materials have been found for specific application in the detection and measurement of non-methane hydrocarbons. The sensor comprises a proton conducting electrolyte sandwiched between two electrodes. At least one of the electrodes is covered with a hydrocarbon decomposition catalyst. Two different modes of operation for the hydrocarbon sensors can be used: equilibrium versus non-equilibrium measurements and differential catalytic. The sensor has particular application for on-board monitoring of automobile exhaust gases to evaluate the performance of catalytic converters. In addition, the sensor can be utilized in monitoring any process where hydrocarbons are exhausted, for instance, industrial power plants. The sensor is low cost, rugged, sensitive, simple to fabricate, miniature, and does not suffer cross sensitivities.

Pham, Ai Quoc (San Jose, CA); Glass, Robert S. (Livermore, CA)

2000-01-01T23:59:59.000Z

290

Leak Detection and H2 Sensor Development for Hydrogen Applications  

SciTech Connect (OSTI)

The objectives of this report are: (1) Develop a low cost, low power, durable, and reliable hydrogen safety sensor for a wide range of vehicle and infrastructure applications; (2) Continually advance test prototypes guided by materials selection, sensor design, electrochemical R&D investigation, fabrication, and rigorous life testing; (3) Disseminate packaged sensor prototypes and control systems to DOE Laboratories and commercial parties interested in testing and fielding advanced prototypes for cross-validation; (4) Evaluate manufacturing approaches for commercialization; and (5) Engage an industrial partner and execute technology transfer. Recent developments in the search for sustainable and renewable energy coupled with the advancements in fuel cell powered vehicles (FCVs) have augmented the demand for hydrogen safety sensors. There are several sensor technologies that have been developed to detect hydrogen, including deployed systems to detect leaks in manned space systems and hydrogen safety sensors for laboratory and industrial usage. Among the several sensing methods electrochemical devices that utilize high temperature-based ceramic electrolytes are largely unaffected by changes in humidity and are more resilient to electrode or electrolyte poisoning. The desired sensing technique should meet a detection threshold of 1% (10,000 ppm) H{sub 2} and response time of {approx_equal}1 min, which is a target for infrastructure and vehicular uses. Further, a review of electrochemical hydrogen sensors by Korotcenkov et.al and the report by Glass et.al suggest the need for inexpensive, low power, and compact sensors with long-term stability, minimal cross-sensitivity, and fast response. This view has been largely validated and supported by the fuel cell and hydrogen infrastructure industries by the NREL/DOE Hydrogen Sensor Workshop held on June 8, 2011. Many of the issues preventing widespread adoption of best-available hydrogen sensing technologies available today outside of cost, derive from excessive false positives and false negatives arising from signal drift and unstable sensor baseline; both of these problems necessitate the need for unacceptable frequent calibration.

Brosha, Eric L. [Los Alamos National Laboratory

2012-07-10T23:59:59.000Z

291

Silicon Sensors for Trackers at High-Luminosity Environment  

E-Print Network [OSTI]

The planned upgrade of the LHC accelerator at CERN, namely the high luminosity (HL) phase of the LHC (HL-LHC foreseen for 2023), will result in a more intense radiation environment than the present tracking system was designed for. The required upgrade of the all-silicon central trackers at the ALICE, ATLAS, CMS and LHCb experiments will include higher granularity and radiation hard sensors. The radiation hardness of the new sensors must be roughly an order of magnitude higher than the one of LHC detectors. To address this, a massive R&D program is underway within the CERN RD50 collaboration "Development of Radiation Hard Semiconductor Devices for Very High Luminosity Colliders" to develop silicon sensors with sufficient radiation tolerance. Research topics include the improvement of the intrinsic radiation tolerance of the sensor material and novel detector designs with benefits like reduced trapping probability (thinned and 3D sensors), maximized sensitive area (active edge sensors) and enhanced charge carrier generation (sensors with intrinsic gain). A review of the recent results from both measurements and TCAD simulations of several detector technologies and silicon materials at radiation levels expected for HL-LHC will be presented.

Timo Peltola

2014-11-26T23:59:59.000Z

292

An Inexpensive CO Sensor  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

6 6 An Inexpensive CO Sensor A schematic of the prototype CO passive sensor. Carbon moNOxide is a colorless, odorless, toxic gas whose primary source indoor is the incomplete combustion of fossil fuels. This gas can be a potential problem in any house that uses combustion appliances for space or water heating, cooking, or idling an automobile in an attached garage. Although most appliances work correctly, a problem can exist in houses when the appliance is unventilated or its ventilation system does not properly eliminate exhaust gases from the house. Since Americans spend 90% of their time indoors and 65 to 70% in their residences, understanding how and when CO builds up indoors could save lives. We have very little systematic data on how CO hazards are distrubuted in the indoor environment, but mortality

293

Ultra-wideband impedance sensor  

DOE Patents [OSTI]

The ultra-wideband impedance sensor (UWBZ sensor, or Z-sensor) is implemented in differential and single-ended configurations. The differential UWBZ sensor employs a sub-nanosecond impulse to determine the balance of an impedance bridge. The bridge is configured as a differential sample-and-hold circuit that has a reference impedance side and an unknown impedance side. The unknown impedance side includes a short transmission line whose impedance is a function of the near proximity of objects. The single-ended UWBZ sensor eliminates the reference side of the bridge and is formed of a sample and hold circuit having a transmission line whose impedance is a function of the near proximity of objects. The sensing range of the transmission line is bounded by the two-way travel time of the impulse, thereby eliminating spurious Doppler modes from large distant objects that would occur in a microwave CW impedance bridge. Thus, the UWBZ sensor is a range-gated proximity sensor. The Z-sensor senses the near proximity of various materials such as metal, plastic, wood, petroleum products, and living tissue. It is much like a capacitance sensor, yet it is impervious to moisture. One broad application area is the general replacement of magnetic sensors, particularly where nonferrous materials need to be sensed. Another broad application area is sensing full/empty levels in tanks, vats and silos, e.g., a full/empty switch in water or petroleum tanks.

McEwan, Thomas E. (Livermore, CA)

1999-01-01T23:59:59.000Z

294

Ultra-wideband impedance sensor  

DOE Patents [OSTI]

The ultra-wideband impedance sensor (UWBZ sensor, or Z-sensor) is implemented in differential and single-ended configurations. The differential UWBZ sensor employs a sub-nanosecond impulse to determine the balance of an impedance bridge. The bridge is configured as a differential sample-and-hold circuit that has a reference impedance side and an unknown impedance side. The unknown impedance side includes a short transmission line whose impedance is a function of the near proximity of objects. The single-ended UWBZ sensor eliminates the reference side of the bridge and is formed of a sample and hold circuit having a transmission line whose impedance is a function of the near proximity of objects. The sensing range of the transmission line is bounded by the two-way travel time of the impulse, thereby eliminating spurious Doppler modes from large distant objects that would occur in a microwave CW impedance bridge. Thus, the UWBZ sensor is a range-gated proximity sensor. The Z-sensor senses the near proximity of various materials such as metal, plastic, wood, petroleum products, and living tissue. It is much like a capacitance sensor, yet it is impervious to moisture. One broad application area is the general replacement of magnetic sensors, particularly where nonferrous materials need to be sensed. Another broad application area is sensing full/empty levels in tanks, vats and silos, e.g., a full/empty switch in water or petroleum tanks. 2 figs.

McEwan, T.E.

1999-03-16T23:59:59.000Z

295

Remotely controlled sensor apparatus for use in dig-face characterization system  

DOE Patents [OSTI]

A remotely controlled sensor platform apparatus useful in a dig-face characterization system is deployed from a mobile delivery device such as standard heavy construction equipment. The sensor apparatus is designed to stabilize sensors against extraneous motions induced by heavy equipment manipulations or other outside influences, and includes a terrain sensing and sensor elevation control system to maintain the sensors in close ground proximity. The deployed sensor apparatus is particularly useful in collecting data in work environments where human access is difficult due to the presence of hazardous conditions, rough terrain, or other circumstances that prevent efficient data collection by conventional methods. Such work environments include hazardous waste sites, unexploded ordnance sites, or construction sites. Data collection in these environments by utilizing the deployed sensor apparatus is desirable in order to protect human health and safety, or to assist in planning daily operations to increase efficiency.

Josten, Nicholas E. (Idaho Falls, ID); Svoboda, John M. (Idaho Falls, ID)

1999-01-01T23:59:59.000Z

296

Remotely controlled sensor apparatus for use in dig-face characterization system  

DOE Patents [OSTI]

A remotely controlled sensor platform apparatus useful in a dig-face characterization system is deployed from a mobile delivery device such as standard heavy construction equipment. The sensor apparatus is designed to stabilize sensors against extraneous motions induced by heavy equipment manipulations or other outside influences, and includes a terrain sensing and sensor elevation control system to maintain the sensors in close ground proximity. The deployed sensor apparatus is particularly useful in collecting data in work environments where human access is difficult due to the presence of hazardous conditions, rough terrain, or other circumstances that prevent efficient data collection by conventional methods. Such work environments include hazardous waste sites, unexploded ordnance sites, or construction sites. Data collection in these environments by utilizing the deployed sensor apparatus is desirable in order to protect human health and safety, or to assist in planning daily operations to increase efficiency. 13 figs.

Josten, N.E.; Svoboda, J.M.

1999-05-25T23:59:59.000Z

297

Sensor Development and Readout Prototyping for the STAR Pixel Detector  

SciTech Connect (OSTI)

The STAR experiment at the Relativistic Heavy Ion Collider (RHIC) is designing a new vertex detector. The purpose of this upgrade detector is to provide high resolution pointing to allow for the direct topological reconstruction of heavy flavor decays such as the D{sup 0} by finding vertices displaced from the collision vertex by greater than 60 microns. We are using Monolithic Active Pixel Sensor (MAPS) as the sensor technology and have a coupled sensor development and readout system plan that leads to a final detector with a <200 {micro}s integration time, 400 M pixels and a coverage of -1 < {eta} < 1. We present our coupled sensor and readout development plan and the status of the prototyping work that has been accomplished.

Greiner, L.; Anderssen, E.; Matis, H.S.; Ritter, H.G.; Stezelberger, T.; Szelezniak, M.; Sun, X.; Vu, C.; Wieman, H.

2009-01-14T23:59:59.000Z

298

Sensor Fusion - Applying sensor fusion in a district heating substation.  

E-Print Network [OSTI]

??Many machines in these days have sensors to collect information from the world they inhabit. The correctness of this information is crucial for the correct (more)

Kangerud, Jim

2005-01-01T23:59:59.000Z

299

Reading Dynamic Kinase Activity in Living Cells for High-Throughput Screening  

Science Journals Connector (OSTI)

Here, we describe a general method for high-throughput reading of dynamic kinase activities using ratiometric fluorescent sensors, and showcase an example of reading intracellular activities of protein kinase A (PKA) and the cyclic adenosine monophosphate (cAMP)/PKA pathway downstream of many G-protein coupled receptors (GPCRs). ... Kinases are crucial nodes in the signaling network and emerging drug targets of the 21st century (1). ...

Michael D. Allen; Lisa M. DiPilato; Meghdad Rahdar; Yunzhao R. Ren; Curtis Chong; Jun O. Liu; Jin Zhang

2006-07-21T23:59:59.000Z

300

A Sensor Web Middleware with Stateful Services for Heterogeneous Sensor Networks  

E-Print Network [OSTI]

and measurement. 3. Sensor Collection Service (SCS) [15] ­ Service to fetch observations, which conform to the O&M information model, from a single sensor or a collection of sensors. It is also used to describe the sensors

Buyya, Rajkumar

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


301

Sensor Network Demonstration for In Situ Decommissioning - 13332  

SciTech Connect (OSTI)

Florida International University's (FIU's) Applied Research Center is currently supporting the Department of Energy's (DOE) Environmental Management Office of D and D and Facility Engineering program. FIU is supporting DOE's initiative to improve safety, reduce technical risks, and limit uncertainty within D and D operations by identifying technologies suitable to meet specific facility D and D requirements, assessing the readiness of those technologies for field deployment, and conducting feasibility studies and large scale demonstrations of promising technologies. During FY11, FIU collaborated with Savannah River National Laboratory in the development of an experimental test site for the demonstration of multiple sensor systems for potential use in the in situ decommissioning process. In situ decommissioning is a process in which the above ground portion of a facility is dismantled and removed, and the underground portion is filled with a cementious material such as grout. In such a scenario, the question remains on how to effectively monitor the structural health of the grout (cracking, flexing, and sinking), as well as track possible migration of contaminants within and out of the grouted monolith. The right types of sensors can aid personnel in better understanding the conditions within the entombed structure. Without sensors embedded in and around the monolith, it will be very difficult to estimate structural integrity and contaminant transport. Yet, to fully utilize the appropriate sensors and the provided data, their performance and reliability must be evaluated outside a laboratory setting. To this end, a large scale experimental setup and demonstration was conducted at FIU. In order to evaluate a large suite of sensor systems, FIU personnel designed and purchased a pre-cast concrete open-top cube, which served as a mock-up of an in situ DOE decommissioned facility. The inside of the cube measures 10 ft x 10 ft x 8 ft. In order to ensure that the individual sensors would be immobilized during the grout pouring activities, a set of nine sensor racks were designed. The 270 sensors provided by Idaho National Laboratory (INL), Mississippi State University (MSU), University of Houston (UH), and University of South Carolina (USC) were secured to these racks based on predetermined locations. Once sensor racks were installed inside the test cube, connected and debugged, approximately 32 cubic yards of special grout material was used to entomb the sensors. MSU provided and demonstrated four types of fiber loop ring-down (FLR) sensors for detection of water, temperature, cracks, and movement of fluids. INL provided and demonstrated time differenced 3D electrical resistivity tomography (ERT), advanced tensiometers for moisture content, and thermocouples for temperature measurements. University of Houston provided smart aggregate (SA) sensors, which detect crack severity and water presence. An additional UH sensor system demonstrated was a Fiber Bragg Grating (FBG) fiber optic system measuring strain, presence of water, and temperature. USC provided a system which measured acoustic emissions during cracking, as well as temperature and pH sensors. All systems were connected to a Sensor Remote Access System (SRAS) data networking and collection system designed, developed and provided by FIU. The purpose of SRAS was to collect and allow download of the raw sensor data from all the sensor system, as well as allow upload of the processed data and any analysis reports and graphs. All this information was made available to the research teams via the Deactivation and Decommissioning Knowledge Management and Information Tool (D and D KM-IT). As a current research effort, FIU is performing an energy analysis, and transferring several sensor systems to a Photovoltaic (PV) System to continuously monitor energy consumption parameters and overall power demands. Also, One final component of this research is focusing on developing an integrated data network to capture, log and analyze sensor system data in near real time from a single inte

Lagos, L.; Varona, J.; Awwad, A. [Applied Research Center, Florida International University, 10555 West Flagler Street, Suite 2100, Miami, FL 33174 (United States)] [Applied Research Center, Florida International University, 10555 West Flagler Street, Suite 2100, Miami, FL 33174 (United States); Rivera, J.; McGill, J. [Department of Energy - DOE, Environmental Management Office (United States)] [Department of Energy - DOE, Environmental Management Office (United States)

2013-07-01T23:59:59.000Z

302

HOMOLOGICAL SENSOR Vin de Silva 1  

E-Print Network [OSTI]

HOMOLOGICAL SENSOR NETWORKS Vin de Silva 1 and Robert Ghrist 2 Sensors and sense-ability A sensor) as well as vast networks of local sensors (for touch). 1Department of Mathematics, Pomona College. 2 possibilities lie in the domain of the small. Swarms of local sensors at micro- or nano- scale have

Ghrist, Robert W.

303

Directional Sensor Control: Heuristic Approaches  

E-Print Network [OSTI]

sensors are fused to form global estimates of target locations. ... We assume that there is a notional fusion center, which ...... a string-submodular type property.

2014-05-03T23:59:59.000Z

304

Health monitoring method for composite materials  

DOE Patents [OSTI]

An in-situ method for monitoring the health of a composite component utilizes a condition sensor made of electrically conductive particles dispersed in a polymeric matrix. The sensor is bonded or otherwise formed on the matrix surface of the composite material. Age-related shrinkage of the sensor matrix results in a decrease in the resistivity of the condition sensor. Correlation of measured sensor resistivity with data from aged specimens allows indirect determination of mechanical damage and remaining age of the composite component.

Watkins, Jr., Kenneth S. (Dahlonega, GA); Morris, Shelby J. (Hampton, VA)

2011-04-12T23:59:59.000Z

305

Measurement of Shaft Vibration Using Ultrasonic Sensor in Sump Pump Systems  

Science Journals Connector (OSTI)

Conventional diagnosis methods for bearings use acceleration sensors. But, the diagnosis method cannot be applied when the bearing is invisible like in sump pump systems in nuclear power plants. For such a cas...

Shogo Tanaka; Hajime Morishige

2004-01-01T23:59:59.000Z

306

Optical Fiber Sensor Technologies for Efficient and Economical Oil Recovery  

SciTech Connect (OSTI)

The overall goal of this project was to develop reliable cost effective sensors for application in the down-hole environment. The physical parameters measured by these sensors were temperature, pressure, flow and acoustic signals. Sensor head configurations for each of the physical measurands were optimized to increase the sensitivity to the particular measurand of interest while decreasing the cross-sensitivity to the other physical measurands and to environmental influences. In addition, the optical signal demodulation electronics was designed to be insensitive to environmental influences while maintaining the required resolution, precision and accuracy of the parameter being sensed. The influence of potentially detrimental agents such as water in the down-hole environment was investigated as well as methods to protect both the optical fiber and the sensor from these detrimental effects.

Wang, a.; Pickrell, G.; Xiao, H.; May, r.

2003-02-27T23:59:59.000Z

307

Large-area fiber-optic chemical sensors  

SciTech Connect (OSTI)

Pacific Northwest Laboratory is developing a large-area chemical sensor that combines chemically selective coatings and optical spectroscopy to detect target compounds. The chemically selective material is incorporated into the cladding of an optical fiber waveguide. The material is interrogated using optical spectroscopic techniques to determine the concentration of target compounds. The optical interrogation method includes two spectroscopies: visible-near infrared absorption spectroscopy and Raman spectroscopy. This work develops the physical and mathematical models of such a sensor and provides a set of tools with which to make design predictions for the large-area chemical sensors. The theoretical relationships derived herein allow the use of bulk absorption parameters and bulk Raman coefficients to predict sensor performance.

Bliss, M.; Craig, R.A.

1995-05-01T23:59:59.000Z

308

Spatiotemporal learning and geo-visualization methods for constructing activity-travel patterns from transit card transaction data  

E-Print Network [OSTI]

The study of human activity-travel patterns for transportation demand forecast has evolved a long way in theories, methodologies and applications. However, the scarcity of data has become a major barrier for the advancement ...

Zhu, Yi, Ph. D. Massachusetts Institute of Technology

2014-01-01T23:59:59.000Z

309

Fluorescent sensor for mercury  

DOE Patents [OSTI]

The present invention provides a sensor for detecting mercury, comprising: a first polynucleotide, comprising a first region, and a second region, a second polynucleotide, a third polynucleotide, a fluorophore, and a quencher, wherein the third polynucleotide is optionally linked to the second region; the fluorophore is linked to the first polynucleotide and the quencher is linked to the second polynucleotide, or the fluorophore is linked to the second polynucleotide and the quencher is linked to the first polynucleotide; the first region and the second region hybridize to the second polynucleotide; and the second region binds to the third polynucleotide in the presence of Hg.sup.2+ ions.

Wang, Zidong (Urbana, IL); Lee, Jung Heon (Evanston, IL); Lu, Yi (Champaign, IL)

2011-11-22T23:59:59.000Z

310

Microfabricated AC impedance sensor  

DOE Patents [OSTI]

A microfabricated instrument for detecting and identifying cells and other particles based on alternating current (AC) impedance measurements. The microfabricated AC impedance sensor includes two critical elements: 1) a microfluidic chip, preferably of glass substrates, having at least one microchannel therein and with electrodes patterned on both substrates, and 2) electrical circuits that connect to the electrodes on the microfluidic chip and detect signals associated with particles traveling down the microchannels. These circuits enable multiple AC impedance measurements of individual particles at high throughput rates with sufficient resolution to identify different particle and cell types as appropriate for environmental detection and clinical diagnostic applications.

Krulevitch, Peter (Pleasanton, CA); Ackler, Harold D. (Sunnyvale, CA); Becker, Frederick (Houston, TX); Boser, Bernhard E. (Berkeley, CA); Eldredge, Adam B. (Austin, TX); Fuller, Christopher K. (Livermore, CA); Gascoyne, Peter R. C. (Bellaire, TX); Hamilton, Julie K. (Tracy, CA); Swierkowski, Stefan P. (Livermore, CA); Wang, Xiao-Bo (San Diego, CA)

2002-01-01T23:59:59.000Z

311

Chemoresistive gas sensor  

DOE Patents [OSTI]

A chemoresistive gas sensor is provided which has improved sensitivity. A layer of organic semiconductor is disposed between two electrodes which, in turn, are connected to a voltage source. High conductivity material is dispersed within the layer of organic semiconductor in the form of very small particles, or islands. The average interisland spacing is selected so that the predominant mode of current flow is by way of electron funneling. Adsorption of gaseous contaminant onto the layer of organic semiconductor modulates the tunneling current in a quantitative manner. 2 figs.

Hirschfeld, T.B.

1987-06-23T23:59:59.000Z

312

Thin film hydrogen sensor  

DOE Patents [OSTI]

A thin film hydrogen sensor includes a substantially flat ceramic substrate with first and second planar sides and a first substrate end opposite a second substrate end; a thin film temperature responsive resistor on the first planar side of the substrate proximate to the first substrate end; a thin film hydrogen responsive metal resistor on the first planar side of the substrate proximate to the fist substrate end and proximate to the temperature responsive resistor; and a heater on the second planar side of the substrate proximate to the first end. 5 figs.

Cheng, Y.T.; Poli, A.A.; Meltser, M.A.

1999-03-23T23:59:59.000Z

313

Thin film hydrogen sensor  

DOE Patents [OSTI]

A thin film hydrogen sensor, includes: a substantially flat ceramic substrate with first and second planar sides and a first substrate end opposite a second substrate end; a thin film temperature responsive resistor on the first planar side of the substrate proximate to the first substrate end; a thin film hydrogen responsive metal resistor on the first planar side of the substrate proximate to the fist substrate end and proximate to the temperature responsive resistor; and a heater on the second planar side of the substrate proximate to the first end.

Cheng, Yang-Tse (Rochester Hills, MI); Poli, Andrea A. (Livonia, MI); Meltser, Mark Alexander (Pittsford, NY)

1999-01-01T23:59:59.000Z

314

Reducing Power Consumption in Wireless Sensor Networks Using a Novel Approach to Data Aggregation  

Science Journals Connector (OSTI)

......low duty cycle operation. These protocols...TinyOS operating system [15]. B-MAC...activity using a low power listening. If...query processing system for sensor networks...intersection. In: Handbook of Multisensor...Versatile low power media access for...Networked Sensor Systems, November 3-5......

Silvio Croce; Francesco Marcelloni; Massimo Vecchio

2008-03-01T23:59:59.000Z

315

Requirements and architecture design principles for a smart city experiment with sensor and social networks integration  

Science Journals Connector (OSTI)

Smart city infrastructures offer unique testbeds ground for innovative experimentation and services offering. Sensors networks in cities with integrated social networks activities can improve people-centric services, while improving infrastructures setting. ... Keywords: collective aware applications, sensors data management, smart city, social networks mining

Christos Samaras; Athena Vakali; Maria Giatsoglou; Despoina Chatzakou; Lefteris Angelis

2013-09-01T23:59:59.000Z

316

Telehealth using ECG Sensor and Accelerometer Hristijan Gjoreski*, Aleksandra Rashkovska**, Simon Kozina*, Mitja Lustrek*, Matjaz Gams*,  

E-Print Network [OSTI]

Telehealth using ECG Sensor and Accelerometer Hristijan Gjoreski*, Aleksandra Rashkovska**, Simon are important components of such systems. Moreover, the monitoring of vital signs, like the ECG, has a key role by combining an ECG sensor and two accelerometers. Our system recognizes the user's activities and detects

Lu?trek, Mitja

317

On the robustness of clustered sensor networks  

E-Print Network [OSTI]

or fault tolerance capability of a sensor system. The redundancy degree of sensors plays two important roles pertaining to the robustness of a sensor network. First, the redundancy degree provides proper parameter values for robust estimator; second, we can...

Cho, Jung Jin

2009-05-15T23:59:59.000Z

318

Mutual information based tracking with mobile sensors  

E-Print Network [OSTI]

In order to utilize mobile sensor nodes in a sensing and estimation problem, one must carefully consider the optimal placement of those sensor nodes and simultaneously account for the cost incurred in moving the sensor ...

Russ, John A., S.M. Massachusetts Institute of Technology

2010-01-01T23:59:59.000Z

319

Prospects for Bandit Solutions in Sensor Management  

Science Journals Connector (OSTI)

......Applications of Sensor Management. Springer. [2...Solutions in Sensor Management 1383 [3] Robbins...allocation. Computing Science and Statistics, 23...Learning and Geometric Approaches. 36th ACM Symp. Theory...2002) Multi-sensor management for information fusion......

Nicos G. Pavlidis; Niall M. Adams; David Nicholson; David J. Hand

2010-11-01T23:59:59.000Z

320

GENERATING TEXT DESCRIPTIONS FOR GEOGRAPHICALLY DISTRIBUTED SENSORS  

E-Print Network [OSTI]

GENERATING TEXT DESCRIPTIONS FOR GEOGRAPHICALLY DISTRIBUTED SENSORS Martin Molina and Javier generation of geographic descriptions in natural language for geographically distributed sensors. We describe generation of geographic descriptions in natural language for geographically distributed sensors. We describe

Molina, Martín

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


321

Hydrogen Sensor Workshop Agenda | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Sensor Workshop Agenda Hydrogen Sensor Workshop Agenda Agenda for the Hydrogen Sensor Workshop held June 8, 2011, in Chicago, Illinois.The workshop was hosted by the U.S....

322

Use of sensors in monitoring civil structures  

E-Print Network [OSTI]

This thesis surveys the use of sensors and sensor networks in monitoring civil structures, with particular emphasis on the monitoring of bridges and highways using fiber optic sensors. Following a brief review of the most ...

Daher, Bassam William, 1979-

2004-01-01T23:59:59.000Z

323

Interferometric fiber optic displacement sensor  

DOE Patents [OSTI]

A method is presented to produce a change in the optical path length in the gap between two single mode optical fibers proportional to the lateral displacement of either fiber end normal to its axis. This is done with the use of refraction or diffraction at the interface between a guiding and non-guiding media to change the direction of propagation of the light in the gap. A method is also presented for laying a waveguide on a cantilever so that the displacement of the tip of the cantilever produces a proportional path length change in the gap by distancing the waveguide from the neutral axis of the cantilever. The fiber is supported as a cantilever or a waveguide is deposited on a micromachined cantilever and incorporated in an interferometer which is made totally on a silicon substrate with the use of integrated-optic technology. A resonant element in the form of a micro-bridge is incorporated in the ridge waveguide and produces a frequency output which is readily digitizeable and immune to laser frequency noise. Finally, monolithic mechanical means for phase modulation are provided on the same sensor substrate. This is done by vibrating the cantilever or micro-bridge either electrically or optically. 29 figs.

Farah, J.

1995-05-30T23:59:59.000Z

324

Queue management based duty cycle control for end-to-end delay guarantees in wireless sensor networks  

Science Journals Connector (OSTI)

In this paper, we propose an analytical method for duty cycle adaptation in wireless sensor networks so that delay requirement is guaranteed while power consumption is minimized. The proposed method, named Dual-QCon, provides a formal method for stabilizing ... Keywords: Delay guarantee, Duty cycle control, Wireless sensor networks

Heejung Byun; Soogook Son; Jungmin So

2013-08-01T23:59:59.000Z

325

Real-time Combustion Control and Diagnostics Sensor-Pressure Oscillation Monitor  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Combustion Control and Diagnostics Combustion Control and Diagnostics Sensor-Pressure Oscillation Monitor Opportunity The Department of Energy's National Energy Technology Laboratory (NETL) is seeking licensing partners interested in implementing its patented "Real-Time Combustion Control and Diagnostics Sensor-Pressure Oscillation Monitor" technology. Disclosed is NETL's sensor system and process for monitoring and controlling the amplitude and/or frequencies of dynamic pressure oscillations in combustion systems during active combustion processes. The combustion control and diagnostics sensor (CCADS) is designed for gas turbine combustors that are operated near the fuel-lean flame extinction limit to minimize production of the atmospheric pollutant NOx. CCADS eliminates the problems of flashback,

326

\\ms\\fahmeed\\ryota-et-al-2007-r2008 in Dynamic Brain Imaging, ed by F. Hyder, in Methods in Molecular Medicine, Humana  

E-Print Network [OSTI]

terminals of these cells in the olfactory bulb glomeruli. There the population signals can be used as a measure of the input from the nose to the bulb. Three kinds of noise in measuring light intensity. Most of these efforts center around fluorescent protein sensors of activity because transgenic methods

Paris-Sud XI, Université de

327

Hydrogen Sensor Workshop | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Sensor Workshop Agenda Participants Workshop participants included: Affiliated Engineers Air Products Apollo Sensor Technology Argonne National Laboratory CenturyLink CSA...

328

Flexible Pressure Sensors: Modeling and Experimental Characterization  

E-Print Network [OSTI]

Flexible capacitive pressure sensors fabricated with nanocomposites were experimentally characterized and results compared with simulations from analytical modeling. Unlike traditional diaphragm silicon pressure sensors, ...

Viana, J.C.

329

Gas sensor incorporating a porous framework  

DOE Patents [OSTI]

The disclosure provides sensor for gas sensing including CO.sub.2 gas sensors comprising a porous framework sensing area for binding an analyte gas.

Yaghi, Omar M; Czaja, Alexander U; Wang, Bo; Galatsis, Kosmas; Wang, Kang L; Furukawa, Hiroyasu

2014-05-27T23:59:59.000Z

330

Compact Potentiometric NOx Sensor | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Potentiometric NOx Sensor Compact Potentiometric NOx Sensor 2011 DOE Hydrogen and Fuel Cells Program, and Vehicle Technologies Program Annual Merit Review and Peer Evaluation...

331

Enabling Long-Lived Sensor Networks Through Solar Energy Harvesting  

E-Print Network [OSTI]

Long - Lived Sensor Networks through Solar Energy Harvestingsolar energy harvesting and storage device for sensor

Jason Hsu; Sadaf Zahedi; Jonathan Friedman; Aman Kansal; Vijay Raghunathan; Mani Srivastava

2005-01-01T23:59:59.000Z

332

Device and method for self-verifying temperature measurement and control  

DOE Patents [OSTI]

A measuring instrument includes a first temperature sensor, a second temperature sensor and circuitry. The first and second temperature sensors each generate a signal indicative of the temperature of a medium being detected. The circuitry is configured to activate verification of temperature being sensed with the first sensor. According to one construction, the first temperature sensor comprises at least one thermocouple temperature sensor and the second temperature sensor comprises an optical temperature sensor, each sensor measuring temperature over the same range of temperature, but using a different physical phenomena. Also according to one construction, the circuitry comprises a computer configured to detect failure of one of the thermocouples by comparing temperature of the optical temperature sensor with each of the thermocouple temperature sensors. Even further, an output control signal is generated via a fuzzy inference machine and control apparatus.

Watkins, Arthur D. (Idaho Falls, ID); Cannon, Collins P. (Kearney, MO); Tolle, Charles R. (Idaho Falls, ID)

2002-10-29T23:59:59.000Z

333

Method of treating intermetallic alloy hydrogenation/oxidation catalysts for improved impurity poisoning resistance, regeneration and increased activity  

DOE Patents [OSTI]

Alternate, successive high temperature oxidation and reduction treatments, in either order, of intermetallic alloy hydrogenation and intermetallic alloy oxidation catalysts unexpectedly improves the impurity poisoning resistance, regeneration capacity and/or activity of the catalysts. The particular alloy, and the final high temperature treatment given alloy (oxidation or reduction) will be chosen to correspond to the function of the catalyst (oxidation or hydrogenation).

Wright, Randy B. (Idaho Falls, ID)

1992-01-01T23:59:59.000Z

334

Time Synchronization in Hierarchical TESLA Wireless Sensor Networks  

SciTech Connect (OSTI)

Time synchronization and event time correlation are important in wireless sensor networks. In particular, time is used to create a sequence events or time line to answer questions of cause and effect. Time is also used as a basis for determining the freshness of received packets and the validity of cryptographic certificates. This paper presents secure method of time synchronization and event time correlation for TESLA-based hierarchical wireless sensor networks. The method demonstrates that events in a TESLA network can be accurately timestamped by adding only a few pieces of data to the existing protocol.

Jason L. Wright; Milos Manic

2009-08-01T23:59:59.000Z

335

Extreme Environment Silicon Carbide Hybrid Temperature & Pressure Optical Sensors  

SciTech Connect (OSTI)

This final report contains the main results from a 3-year program to further investigate the merits of SiC-based hybrid sensor designs for extreme environment measurements in gas turbines. The study is divided in three parts. Part 1 studies the material properties of SiC such as temporal response, refractive index change with temperature, and material thermal response reversibility. Sensor data from a combustion rig-test using this SiC sensor technology is analyzed and a robust distributed sensor network design is proposed. Part 2 of the study focuses on introducing redundancy in the sensor signal processing to provide improved temperature measurement robustness. In this regard, two distinct measurement methods emerge. A first method uses laser wavelength sensitivity of the SiC refractive index behavior and a second method that engages the Black-Body (BB) radiation of the SiC package. Part 3 of the program investigates a new way to measure pressure via a distance measurement technique that applies to hot objects including corrosive fluids.

Nabeel Riza

2010-09-01T23:59:59.000Z

336

Novel, fiber optic, hybrid pressure and temperature sensor designed for high-temperature gen-IV reactor applications  

SciTech Connect (OSTI)

A novel, fiber optic, hybrid pressure-temperature sensor is presented. The sensor is designed for reliable operation up to 1050 C, and is based on the high-temperature fiber optic sensors already demonstrated during previous work. The novelty of the sensors presented here lies in the fact that pressure and temperature are measured simultaneously with a single fiber and a single transducer. This hybrid approach will enable highly accurate active temperature compensation and sensor self-diagnostics not possible with other platforms. Hybrid pressure and temperature sensors were calibrated by varying both pressure and temperature. Implementing active temperature compensation resulted in a ten-fold reduction in the temperature-dependence of the pressure measurement. Sensors were also tested for operability in a relatively high neutron radiation environment up to 6.9x10{sup 17} n/cm{sup 2}. In addition to harsh environment survivability, fiber optic sensors offer a number of intrinsic advantages for nuclear power applications including small size, immunity to electromagnetic interference, self diagnostics / prognostics, and smart sensor capability. Deploying fiber optic sensors on future nuclear power plant designs would provide a substantial improvement in system health monitoring and safety instrumentation. Additional development is needed, however, before these advantages can be realized. This paper will highlight recent demonstrations of fiber optic sensors in environments relevant to emerging nuclear power plants. Successes and lessons learned will be highlighted. (authors)

Palmer, M. E.; Fielder, R. S.; Davis, M. A. [Luna Innovations, Incorporated, 2851 Commerce St., Blacksburg, VA 24060 (United States)

2006-07-01T23:59:59.000Z

337

Unique battery with a multi-functional, physicochemically active membrane separator/electrolyte-electrode monolith and a method making the same  

DOE Patents [OSTI]

The invention relates to a unique battery having a physicochemically active membrane separator/electrolyte-electrode monolith and method of making the same. The Applicant's invented battery employs a physicochemically active membrane separator/electrolyte-electrode that acts as a separator, electrolyte, and electrode, within the same monolithic structure. The chemical composition, physical arrangement of molecules, and physical geometry of the pores play a role in the sequestration and conduction of ions. In one preferred embodiment, ions are transported via the ion-hoping mechanism where the oxygens of the Al.sub.2O.sub.3 wall are available for positive ion coordination (i.e. Li.sup.+). This active membrane-electrode composite can be adjusted to a desired level of ion conductivity by manipulating the chemical composition and structure of the pore wall to either increase or decrease ion conduction.

Gerald, II, Rex E; Ruscic, Katarina J; Sears, Devin N; Smith, Luis J; Klinger, Robert J; Rathke, Jerome W

2013-11-26T23:59:59.000Z

338

Unique battery with an active membrane separator having uniform physico-chemically functionalized ion channels and a method making the same  

DOE Patents [OSTI]

The invention relates to a unique battery having an active, porous membrane and method of making the same. More specifically the invention relates to a sealed battery system having a porous, metal oxide membrane with uniform, physicochemically functionalized ion channels capable of adjustable ionic interaction. The physicochemically-active porous membrane purports dual functions: an electronic insulator (separator) and a unidirectional ion-transporter (electrolyte). The electrochemical cell membrane is activated for the transport of ions by contiguous ion coordination sites on the interior two-dimensional surfaces of the trans-membrane unidirectional pores. The membrane material is designed to have physicochemical interaction with ions. Control of the extent of the interactions between the ions and the interior pore walls of the membrane and other materials, chemicals, or structures contained within the pores provides adjustability of the ionic conductivity of the membrane.

Gerald, II, Rex E. (Brookfield, IL); Ruscic, Katarina J. (Chicago, IL); Sears, Devin N. (Spruce Grove, CA); Smith, Luis J. (Natick, MA); Klingler, Robert J. (Glenview, IL); Rathke, Jerome W. (Homer Glen, IL)

2012-02-21T23:59:59.000Z

339

Transformer current sensor for superconducting magnetic coils  

DOE Patents [OSTI]

A transformer current sensor having primary turns carrying a primary current for a superconducting coil and secondary turns only partially arranged within the primary turns. The secondary turns include an active winding disposed within the primary turns and a dummy winding which is not disposed in the primary turns and so does not experience a magnetic field due to a flow of current in the primary turns. The active and dummy windings are wound in opposite directions or connected in series-bucking relationship, and are exposed to the same ambient magnetic field. Voltages which might otherwise develop in the active and dummy windings due to ambient magnetic fields thus cancel out. The resultant voltage is purely indicative of the rate of change of current flowing in the primary turns.

Shen, Stewart S. (Oak Ridge, TN); Wilson, C. Thomas (Norris, TN)

1988-01-01T23:59:59.000Z

340

Large-scale simulation of steady and time-dependent active suspensions with the force-coupling method  

E-Print Network [OSTI]

We present a new development of the force-coupling method (FCM) to address the accurate simulation of a large number of interacting micro-swimmers. Our approach is based on the squirmer model, which we adapt to the FCM framework, resulting in a method that is suitable for simulating semi-dilute squirmer suspensions. Other effects, such as steric interactions, can be readily considered with our model. We test our method by comparing the velocity field around a single squirmer and the pairwise interactions between two squirmers with exact solutions to the Stokes equations and results given by other numerical methods. We also illustrate our method's ability to describe spheroidal swimmer shapes and biologically-relevant time-dependent swimming gaits. We detail the numerical algorithm used to compute the hydrodynamic coupling between a large collection ($10^4-10 ^5$) of micro-swimmers. Using this methodology, we investigate the emergence of polar order in a suspension of squirmers and show that for large domains,...

Delmotte, Blaise; Plouraboue, Franck; Climent, Eric

2015-01-01T23:59:59.000Z

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


341

Accuracy in temperature sensor response time estimation for new nuclear reactor designs  

Science Journals Connector (OSTI)

One method for measuring the response time of temperature sensors, the plunge test, verifies that the sensor has a suitable response time in the laboratory before installation. However, plunge test results cannot be extrapolated to the response time in an operating plant because response time is affected by multiple factors such as the ratio of internal heat-transfer resistance to the surface heat-transfer resistance, or Biot Modulus. The estimation method presented here can be used to extrapolate laboratory response-time measurements to determine sensor response time in another medium, in different test conditions, or in actual applications such as a nuclear power plant. However, experiments conducted at Oak Ridge National Laboratory have confirmed that the effect of temperature on sensor response time cannot be estimated confidently in an operating environment. Therefore, the loop current step response (LCSR) method was developed to measure the actual in-service response time of nuclear plant temperature sensors.

H.M. Hashemian; Jin Jiang

2011-01-01T23:59:59.000Z

342

DOE Safety, Codes, and Standards Activities  

Broader source: Energy.gov [DOE]

DOE's safety R&D activities are aimed at developing sensors to detect hydrogen leaks in hydrogen and fuel cell systems. DOE's codes and standards activities are focused on coordinating and...

343

Method and apparatus for measuring solar radiation in a vegetative canopy  

DOE Patents [OSTI]

An apparatus and method for measuring solar radiation received in a vegetative canopy. A multiplicity of sensors selectively generates electrical signals in response to impinging photosynthetically active radiation in sunlight. Each sensor is attached to a plant within the canopy and is electrically connected to a separate port in a junction box having a multiplicity of ports. Each port is connected to an operational amplifier. Each amplifier amplifies the signals generated by the sensors. Each amplifier is connected to an analog-to-digital convertor which digitizes each signal. A computer is connected to the convertors and accumulates and stores solar radiation data. A data output device such as a printer is connected to the computer and displays the data.

Gutschick, V.P.; Barron, M.H.; Waechter, D.A.; Wolf, M.A.

1985-04-30T23:59:59.000Z

344

Method and apparatus for measuring solar radiation in a vegetative canopy  

DOE Patents [OSTI]

An apparatus and method for measuring solar radiation received in a vegetative canopy. A multiplicity of sensors selectively generates electrical signals in response to impinging photosynthetically active radiation in sunlight. Each sensor is attached to a plant within the canopy and is electrically connected to a separate port in a junction box having a multiplicity of ports. Each port is connected to an operational amplifier. Each amplifier amplifies the signals generated by the sensors. Each amplifier is connected to an analog-to-digital convertor which digitizes each signal. A computer is connected to the convertors and accumulates and stores solar radiation data. A data output device such as a printer is connected to the computer and displays the data.

Gutschick, Vincent P. (Los Alamos, NM); Barron, Michael H. (Los Alamos, NM); Waechter, David A. (Los Alamos, NM); Wolf, Michael A. (Los Alamos, NM)

1987-01-01T23:59:59.000Z

345

Monday, March 29, 2010 A Bendable Heart Sensor  

E-Print Network [OSTI]

Monday, March 29, 2010 A Bendable Heart Sensor New flexible electronics can better chart the heart a more detailed picture of the electrical activity of a beating heart. This high-resolution electrical map could help improve the diagnosis and treatment of heart abnormalities by pinpointing areas

Rogers, John A.

346

Ion mobility sensor system  

DOE Patents [OSTI]

An ion mobility sensor system including an ion mobility spectrometer and a differential mobility spectrometer coupled to the ion mobility spectrometer. The ion mobility spectrometer has a first chamber having first end and a second end extending along a first direction, and a first electrode system that generates a constant electric field parallel to the first direction. The differential mobility spectrometer includes a second chamber having a third end and a fourth end configured such that a fluid may flow in a second direction from the third end to the fourth end, and a second electrode system that generates an asymmetric electric field within an interior of the second chamber. Additionally, the ion mobility spectrometer and the differential mobility spectrometer form an interface region. Also, the first end and the third end are positioned facing one another so that the constant electric field enters the third end and overlaps the fluid flowing in the second direction.

Xu, Jun; Watson, David B.; Whitten, William B.

2013-01-22T23:59:59.000Z

347

Energy Saving Mechanisms in Sensor Networks Lan Wang and Yang Xiao  

E-Print Network [OSTI]

Energy Saving Mechanisms in Sensor Networks Lan Wang and Yang Xiao Computer Science Department try to save energy by configuring the sensors into certain topologies, therefore such mechanisms have-efficient scheduling mech- anisms". There are many other methods to save energy, such as reducing communication range

Wang, Lan

348

SaVE: sensor-assisted motion estimation for efficient h.264/AVC video encoding  

Science Journals Connector (OSTI)

Motion estimation is a key component of modern video encoding and is very compute-intensive. We present a novel Sensor-assisted Video Encoding (SaVE) method to reduce the computational complexity of motion estimation in H.264/AVC encoders, leveraging ... Keywords: H.264/AVC, MPEG, accelerometer, digital compass, motion estimation, sensor, video encoding

Xiaoming Chen; Zhendong Zhao; Ahmad Rahmati; Ye Wang; Lin Zhong

2009-10-01T23:59:59.000Z

349

Single walled carbon nanotubes with functionally adsorbed biopolymers for use as chemical sensors  

DOE Patents [OSTI]

Chemical field effect sensors comprising nanotube field effect devices having biopolymers such as single stranded DNA or RNA functionally adsorbed to the nanotubes are provided. Also included are arrays comprising the sensors and methods of using the devices to detect volatile compounds.

Johnson, Jr., Alan T

2013-12-17T23:59:59.000Z

350

Nonparametric modelling of ECG: Applications to denoising and to single sensor  

E-Print Network [OSTI]

Nonparametric modelling of ECG: Applications to denoising and to single sensor fetal ECG extraction the problem of fetal electrocardio- gram (ECG) extraction from a single sensor. The proposed method is based on non-parametric modelling of the ECG signal described thanks to its second order statistics. Each

Boyer, Edmond

351

NEW OPTICAL SENSOR SUITE FOR ULTRAHIGH TEMPERATURE FOSSIL FUEL APPLICATIONS  

SciTech Connect (OSTI)

Accomplishments during the Phase I of a program to develop and demonstrate technology for the instrumentation of advanced powerplants are described. Engineers from Prime Research, LC and Babcock and Wilcox Research Center collaborated to generate a list of potential applications for robust photonic sensors in existing and future boiler plants. From that list, three applications were identified as primary candidates for initial development and demonstration of high-temperature sensors in an ultrasupercritical power plant. A matrix of potential fiber optic sensor approaches was derived, and a data set of specifications for high-temperature optical fiber was produced. Several fiber optic sensor configurations, including interferometric (extrinsic and intrinsic Fabry-Perot interferometer), gratings (fiber Bragg gratings and long period gratings), and microbend sensors, were evaluated in the laboratory. In addition, progress was made in the development of materials and methods to apply high-temperature optical claddings to sapphire fibers, in order to improve their optical waveguiding properties so that they can be used in the design and fabrication of high-temperature sensors. Through refinements in the processing steps, the quality of the interface between core and cladding of the fibers was improved, which is expected to reduce scattering and attenuation in the fibers. Numerical aperture measurements of both clad and unclad sapphire fibers were obtained and used to estimate the reduction in mode volume afforded by the cladding. High-temperature sensors based on sapphire fibers were also investigated. The fabrication of an intrinsic Fabry-Perot cavity within sapphire fibers was attempted by the bulk diffusion of magnesium oxide into short localized segments of longer sapphire fibers. Fourier analysis of the fringes that resulted when the treated fiber was interrogated by a swept laser spectrometer suggested that an intrinsic cavity had been formed in the fiber. Also, an unclad sapphire fiber was tested as a temperature sensor at moderate temperatures (up to 775 C).

Russell G. May; Tony Peng; Tom Flynn

2004-12-01T23:59:59.000Z

352

Method of treating intermetallic alloy hydrogenation/oxidation catalysts for improved impurity poisoning resistance, regeneration and increased activity  

DOE Patents [OSTI]

Alternate, successive high temperature oxidation and reduction treatments, in either order, of intermetallic alloy hydrogenation and intermetallic alloy oxidation catalysts unexpectedly improves the impurity poisoning resistance, regeneration capacity and/or activity of the catalysts. The particular alloy, and the final high temperature treatment given alloy (oxidation or reduction) will be chosen to correspond to the function of the catalyst (oxidation or hydrogenation). 23 figs.

Wright, R.B.

1992-01-14T23:59:59.000Z

353

Enhancement of a fluorescent sensor for monitoring glucose concentration in diabetic patients  

E-Print Network [OSTI]

procedure, but unforeseen complications in lyophilization of the new sensor assay restricted its completion. Due to instability of Con A in solution, it was hypothesized that the immobilization of it onto the surface of an active substrate would increase its...

Ibey, Bennett Luke

2007-04-25T23:59:59.000Z

354

Ultra-Sensitive biochemical Sensor based on Circular Bragg Micro-Cavities  

E-Print Network [OSTI]

an SEM micrograph of an ABR sensor realized within a thin membrane of InGaAsP active material. The device with high spectral resolution and excellent sensitivity to changes in the absorption or refractive index

Scheuer, Jacob (Koby)

355

Electromagnetic and nuclear radiation detector using micromechanical sensors  

DOE Patents [OSTI]

Electromagnetic and nuclear radiation is detected by micromechanical sensors that can be coated with various interactive materials. As the micromechanical sensors absorb radiation, the sensors bend and/or undergo a shift in resonance characteristics. The bending and resonance changes are detected with high sensitivity by any of several detection methods including optical, capacitive, and piezoresistive methods. Wide bands of the electromagnetic spectrum can be imaged with picoJoule sensitivity, and specific absorptive coatings can be used for selective sensitivity in specific wavelength bands. Microcantilevers coated with optical cross-linking polymers are useful as integrating optical radiation dosimeters. Nuclear radiation dosimetry is possible by fabricating cantilevers from materials that are sensitive to various nuclear particles or radiation. Upon exposure to radiation, the cantilever bends due to stress and its resonance frequency shifts due to changes in elastic properties, based on cantilever shape and properties of the coating.

Thundat, Thomas G. (Knoxville, TN); Warmack, Robert J. (Knoxville, TN); Wachter, Eric A. (Oak Ridge, TN)

2000-01-01T23:59:59.000Z

356

UAV sensor and survivability issues  

SciTech Connect (OSTI)

This report discusses the most significant tradeoffs between the operating altitude and the complexity and cost of UAVs and sensors. Low altitudes allow less complex, smaller sensors and platforms, but are vulnerable to ground fire. High altitudes require more numerous and capable sensors, but provide wider swaths for more rapid coverage and reduced vulnerability to ground fire. It is shown that for mission requirements and air defenses that higher is not necessarily better and that optimal flight altitudes exist that can be determined analytically.

Canavan, G.H.

1996-07-01T23:59:59.000Z

357

Sensors for Safety & Performance Stationary Systems  

E-Print Network [OSTI]

for PEM Fuel Cell Vehicles · Interfacial Stability of Thin Film H2 Sensors · Sensors for Automotive Fuel Cell Systems · Micro-Machined Thin Film H2 Gas Sensors · Sensor Development for PEM Fuel Cell Systems for Fuel Cell Monitoring #12;Discussion Points Barriers ·Cost ·Application ·Lifetime ·Flexibility ·Public

358

IEEE SENSORS JOURNAL, VOL. 4, NO. 4, AUGUST 2004 395 Sensor Technologies for Monitoring Metabolic  

E-Print Network [OSTI]

IEEE SENSORS JOURNAL, VOL. 4, NO. 4, AUGUST 2004 395 Sensor Technologies for Monitoring Metabolic Michelle Wilson, Member, IEEE Abstract--A review of optical, chemical, and biological sensors to detect-on-a-chip research instrumentation. The sensors reviewed include optical sensors, at both research and commercial

Wilson, Denise

359

Modeling green fluorescent protein transcription, translation and modification as a method to obtain NF-kappaB activation profiles  

E-Print Network [OSTI]

Jayaraman Committee Members, Juergen Hahn Mike McShane Head of Department, N.K. Anand August 2007 Major Subject: Chemical Engineering iii ABSTRACT Modeling Green Fluorescent Protein Transcription, Translation and Modification as a Method... my profound thanks to my advisor, Dr. Arul Jayaraman, and my committee members, Dr. Juergen Hahn and Dr. Mike McShane, for their guidance and support throughout the course of this research. I would like to extend my gratitude to Jacky Huang who...

Laible, Allyson Marie

2009-05-15T23:59:59.000Z

360

Online Sensor Calibration Monitoring Uncertainty Estimation  

SciTech Connect (OSTI)

Empirical modeling techniques have been applied to online process monitoring to detect equipment and instrumentation degradations. However, few applications provide prediction uncertainty estimates, which can provide a measure of confidence in decisions. This paper presents the development of analytical prediction interval estimation methods for three common nonlinear empirical modeling strategies: artificial neural networks, neural network partial least squares, and local polynomial regression. The techniques are applied to nuclear power plant operational data for sensor calibration monitoring, and the prediction intervals are verified via bootstrap simulation studies.

Hines, J. Wesley; Rasmussen, Brandon [University of Tennessee (United States)

2005-09-15T23:59:59.000Z

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


361

Waveguide-based optical chemical sensor  

DOE Patents [OSTI]

The invention provides an apparatus and method for highly selective and sensitive chemical sensing. Two modes of laser light are transmitted through a waveguide, refracted by a thin film host reagent coating on the waveguide, and analyzed in a phase sensitive detector for changes in effective refractive index. Sensor specificity is based on the particular species selective thin films of host reagents which are attached to the surface of the planar optical waveguide. The thin film of host reagents refracts laser light at different refractive indices according to what species are forming inclusion complexes with the host reagents.

Grace, Karen M. (Ranchos de Taos, NM); Swanson, Basil I. (Los Alamos, NM); Honkanen, Seppo (Tucson, AZ)

2007-03-13T23:59:59.000Z

362

Aircraft Cabin Environmental Quality Sensors  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Aircraft Cabin Environmental Quality Sensors Aircraft Cabin Environmental Quality Sensors Title Aircraft Cabin Environmental Quality Sensors Publication Type Report Year of Publication 2004 Authors Gundel, Lara A., Thomas W. Kirchstetter, Michael Spears, and Douglas P. Sullivan Keywords carbon monoxide, ozone Abstract Identification of aircraft cabin environmental quality concerns for which sensors may be useful The highest priority environmental indicators identified are ozone and cabin air pressure, followed by carbon monoxide and carbon dioxide with moderate priority, and then relative humidity, airborne particles, and organic contaminants, including engine oil byproducts and pesticides. This list is based on the Congressional requirements and recent scientific literature, starting with information from recent studies (NAS/NRC, ASHRAE/Battelle), and continuing by seeking input from a variety of stakeholders.

363

Nuclear magnetic resonance readable sensors  

E-Print Network [OSTI]

The monitoring of physiological biomarkers is fundamental to the diagnosis and treatment of disease. We describe here the development of molecular sensors which can be read by magnetic resonance (MR) relaxometry. MR is an ...

Ling, Yibo

2010-01-01T23:59:59.000Z

364

Honeywell developing fuel cell sensors  

Science Journals Connector (OSTI)

In the US, four development teams from Honeywell Sensing & Control are collaborating in a DOE project to develop sensors that provide better control in the demanding fuel cell environment.

2004-01-01T23:59:59.000Z

365

Compact orthogonal NMR field sensor  

DOE Patents [OSTI]

A Compact Orthogonal Field Sensor for emitting two orthogonal electro-magnetic fields in a common space. More particularly, a replacement inductor for existing NMR (Nuclear Magnetic Resonance) sensors to allow for NMR imaging. The Compact Orthogonal Field Sensor has a conductive coil and a central conductor electrically connected in series. The central conductor is at least partially surrounded by the coil. The coil and central conductor are electrically or electro-magnetically connected to a device having a means for producing or inducing a current through the coil and central conductor. The Compact Orthogonal Field Sensor can be used in NMR imaging applications to determine the position and the associated NMR spectrum of a sample within the electro-magnetic field of the central conductor.

Gerald, II, Rex E. (Brookfield, IL); Rathke, Jerome W. (Homer Glen, IL)

2009-02-03T23:59:59.000Z

366

Downhole Sensor Holds Transformative Potential  

Broader source: Energy.gov [DOE]

Long-term operation of electronics at high temperatures remains a challenge for the geothermal sector; many downhole sensors are prone to failure when deployed in high-temperature wells, which limits the availability and complexity of logging tools av

367

Clustering of metal atoms in organic media. 9. High-activity Ni/MgO catalysts prepared by metal vapor methods. Surface area and particle size effects  

SciTech Connect (OSTI)

A metal vapor method was employed to prepare highly dispersed Ni metal catalysts (solvated metal atom dispersed = SMAD catalyst) supported on MgO. Compared with conventional Ni/MgO compositions, the SMAD catalysts showed much greater activities for all reactions studied (hydrogenolysis of methylcyclopentane, MCP; hydrogenation/hydrogenolysis of toluene, TOL; methanation of carbon monoxide, CO; dehydration of isopropyl alcohol, IPA). These high activities for the SMAD catalysts are attributed to the high surface area of Ni on MgO and the high percentage of this Ni in a zero-valent state (reduction degree). Conventional methods for preparing Ni/MgO catalysts did not yield nearly such favorable surface areas or reduction degrees. Nickel particle size effects were observed during hydrogenolysis studies of MCP and hydrogenation studies of TOL. These phenomena are explained by assuming the size of an active Ni particle to be largest for hydrogenolysis of MCP > hydrogenation of TOL > methanation of CO approx. = dehydrogenation of IPA. 8 figures, 2 tables.

Matsuo, K.; Klabunde, K.J.

1982-02-01T23:59:59.000Z

368

Space sensors for global change  

SciTech Connect (OSTI)

Satellite measurements should contribute to a fuller understanding of the physical processes behind the radiation budget, exchange processes, and global change. Climate engineering requires global observation for early indications of predicted effects, which puts a premium on affordable, distributed constellations of satellites with effective, affordable sensors. Defense has a requirement for continuous global surveillance for warning of aggression, which could evolve from advanced sensors and satellites in development. Many climate engineering needs match those of defense technologies.

Canavan, G.H.

1994-02-15T23:59:59.000Z

369

Battery system with temperature sensors  

SciTech Connect (OSTI)

A battery system includes a platform having an aperture formed therethrough, a flexible member having a generally planar configuration and extending across the aperture, wherein a portion of the flexible member is coextensive with the aperture, a cell provided adjacent the platform, and a sensor coupled to the flexible member and positioned proximate the cell. The sensor is configured to detect a temperature of the cell.

Wood, Steven J; Trester, Dale B

2014-02-04T23:59:59.000Z

370

Novel Gas Sensors for High-Temperature Fossil Fuel Applications  

SciTech Connect (OSTI)

SRI International (SRI) is developing ceramic-based microsensors to detect exhaust gases such as NO, NO{sub 2}, and CO in advanced combustion and gasification systems under this DOE NETL-sponsored research project. The sensors detect the electrochemical activity of the exhaust gas species on catalytic electrodes attached to a solid state electrolyte and are designed to operate at the high temperatures, elevated pressures, and corrosive environments typical of large power generation exhausts. The sensors can be easily integrated into online monitoring systems for active emission control. The ultimate objective is to develop sensors for multiple gas detection in a single package, along with data acquisition and control software and hardware, so that the information can be used for closed-loop control in novel advanced power generation systems. This report details the Phase I Proof-of-Concept, research activities performed from October 2003 to March 2005. SRI's research work includes synthesis of catalytic materials, sensor design and fabrication, software development, and demonstration of pulse voltammetric analysis of NO, NO{sub 2}, and CO gases on catalytic electrodes.

Palitha Jayaweera; Francis Tanzella

2005-03-01T23:59:59.000Z

371

ANL Activities  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Activities of the DOD Activities of the DOD Project Office focus today on the Navy's Free Electron Laser Program Argonne Accelerator Institute Meeting June 16, 2009 2 Several Beam Activities and Interests Ongoing  Terahertz sources and applications  Navy Free Electron Laser (Focus area today)  Free Electron Laser Applications  Electromagnetic Interference Technology Review Committees  Novel Fiber Optic Materials with Army Research Lab  Optical Diagnostics for next-generation light sources  Neutron detection schemes  NATO Sensors and Electronics Panel, international field tests of directed energy source applications  Controls  Radiation Oncology 3 Background, Naval Directed Energy History The U.S Navy has been investigating utility of lasers since the 1960's and the

372

Application Of High-Resolution Thermal Infrared Sensors For Geothermal  

Open Energy Info (EERE)

High-Resolution Thermal Infrared Sensors For Geothermal High-Resolution Thermal Infrared Sensors For Geothermal Exploration At The Salton Sea, California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Application Of High-Resolution Thermal Infrared Sensors For Geothermal Exploration At The Salton Sea, California Details Activities (2) Areas (1) Regions (0) Abstract: The Salton Sea geothermal field straddles the southeast margin of the Salton Sea in California, USA. This field includes approximately 20km2 of mud volcanoes and mud pots and centered on the Mullet Island thermal anomaly. The area has been previously exploited for geothermal power; there are currently seven power plants in the area that produce 1000 MW. The field itself is relatively un-vegetated, which provides for unfettered

373

Distributed Optical Sensor for CO2 Leak Detection  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Optical Sensor for CO Optical Sensor for CO 2 Leak Detection Opportunity Research is active on the technology "Distributed Optical Sensor for CO 2 Leak Detection," for which a Patent Application has been filed. This technology is available for licensing and/or further collaborative research from the U.S. Department of Energy's National Energy Technology Laboratory (NETL). Overview The availability of fossil fuels to provide clean, affordable energy is essential for domestic and global prosperity and security well into the 21st century. However, there are concerns over the impacts of greenhouse gases (GHGs) in the atmosphere-particularly carbon dioxide (CO 2 ). Carbon capture and storage in geologic formations is a promising technology to reduce the impact of CO

374

DEVELOPMENT OF LOW COST SENSORS FOR HYDROGEN SAFETY APPLICATIONS  

E-Print Network [OSTI]

production, storage, and utilization technologies brings with it the need to detect and pinpoint hydrogen materials and fabrication methods, which have obvious cost advantages. The response to hydrogenDEVELOPMENT OF LOW COST SENSORS FOR HYDROGEN SAFETY APPLICATIONS Barbara S. Hoffheins, L. Curt

375

VEHICLE TRACKING USING MOBILE WIRELESS SENSOR NETWORKS DURING DYNAMIC LOAD  

E-Print Network [OSTI]

and put into service, engineers lack cost-effective methods for measuring the actual loads imposedVEHICLE TRACKING USING MOBILE WIRELESS SENSOR NETWORKS DURING DYNAMIC LOAD TESTING OF HIGHWAY in the understanding of vehicle-bridge interactions. Direct measurement of the complex coupling that naturally exists

Lynch, Jerome P.

376

Sensor Management Problems of Nuclear Detection Tamra Carpenter  

E-Print Network [OSTI]

or naturally occurring radioactive materials like the clay found in pottery and kitty litter. The need to distinguish true threats from commonly occurring benign sources and background sources of radiation of greatest emphasis in the project: 1) methods to exploit data from radiation sensors and shipping manifests

377

Calorimetric gas sensor  

DOE Patents [OSTI]

A combustible gas sensor is described that uses a resistively heated, noble metal-coated, micromachined polycrystalline Si filament to calorimetrically detect the presence and concentration of combustible gases. The filaments tested to date are 2 {micro}m thick {times} 10{micro}m wide {times} 100, 250, 500, or 1000 {micro}m-long polycrystalline Si; some are overcoated with a 0.25 {micro}m-thick protective CVD Si{sub 3}N{sub 4} layer. A thin catalytic Pt film was deposited by CVD from the precursor Pt(acac){sub 2} onto microfilaments resistively heated to approximately 500 C; Pt deposits only on the hot filament. Using a constant-resistance-mode feedback circuit, Pt-coated filaments operating at ca. 300 C (35 mW input power) respond linearly, in terms of the change in supply current required to maintain constant resistance (temperature), to H{sub 2} concentrations between 100 ppm and 1% in an 80/20 N{sub 2}/O{sub 2} mixture. Other catalytic materials can also be used. 11 figs.

Ricco, A.J.; Hughes, R.C.; Smith, J.H.; Moreno, D.J.; Manginell, R.P.; Senturia, S.D.; Huber, R.J.

1998-11-10T23:59:59.000Z

378

Calorimetric gas sensor  

DOE Patents [OSTI]

A combustible gas sensor that uses a resistively heated, noble metal-coated, micromachined polycrystalline Si filament to calorimetrically detect the presence and concentration of combustible gases. The filaments tested to date are 2 .mu.m thick.times.10 .mu.m wide.times.100, 250, 500, or 1000 .mu.m-long polycrystalline Si; some are overcoated with a 0.25 .mu.m-thick protective CVD Si.sub.3 N.sub.4 layer. A thin catalytic Pt film was deposited by CVD from the precursor Pt(acac).sub.2 onto microfilaments resistively heated to approximately 500.degree. C.; Pt deposits only on the hot filament. Using a constant-resistance-mode feedback circuit, Pt-coated filaments operating at ca. 300.degree. C. (35 mW input power) respond linearly, in terms of the change in supply current required to maintain constant resistance (temperature), to H.sub.2 concentrations between 100 ppm and 1% in an 80/20 N.sub.2 /O.sub.2 mixture. Other catalytic materials can also be used.

Ricco, Antonio J. (Albuquerque, NM); Hughes, Robert C. (Cedar Crest, NM); Smith, James H. (Albuquerque, NM); Moreno, Daniel J. (Albuquerque, NM); Manginell, Ronald P. (Albuquerque, NM); Senturia, Stephen D. (Brookline, MA); Huber, Robert J. (Bountiful, UT)

1998-01-01T23:59:59.000Z

379

Beam current sensor  

DOE Patents [OSTI]

A current sensor for measuring the dc component of a beam of charged particles employs a superconducting pick-up loop probe, with twisted superconducting leads in combination with a Superconducting Quantum Interference Device (SQUID) detector. The pick-up probe is in the form of a single-turn loop, or a cylindrical toroid, through which the beam is directed and within which a first magnetic flux is excluded by the Meisner effect. The SQUID detector acts as a flux-to-voltage converter in providing a current to the pick-up loop so as to establish a second magnetic flux within the electrode which nulls out the first magnetic flux. A feedback voltage within the SQUID detector represents the beam current of the particles which transit the pick-up loop. Meisner effect currents prevent changes in the magnetic field within the toroidal pick-up loop and produce a current signal independent of the beam's cross-section and its position within the toroid, while the combination of superconducting elements provides current measurement sensitivities in the nano-ampere range.

Kuchnir, M.; Mills, F.E.

1984-09-28T23:59:59.000Z

380

Beam current sensor  

DOE Patents [OSTI]

A current sensor for measuring the DC component of a beam of charged particles employs a superconducting pick-up loop probe, with twisted superconducting leads in combination with a Superconducting Quantum Interference Device (SQUID) detector. The pick-up probe is in the form of a single-turn loop, or a cylindrical toroid, through which the beam is directed and within which a first magnetic flux is excluded by the Meisner effect. The SQUID detector acts as a flux-to-voltage converter in providing a current to the pick-up loop so as to establish a second magnetic flux within the electrode which nulls out the first magnetic flux. A feedback voltage within the SQUID detector represents the beam current of the particles which transit the pick-up loop. Meisner effect currents prevent changes in the magnetic field within the toroidal pick-up loop and produce a current signal independent of the beam's cross-section and its position within the toroid, while the combination of superconducting elements provides current measurement sensitivites in the nano-ampere range.

Kuchnir, Moyses (Elmhurst, IL); Mills, Frederick E. (Elburn, IL)

1987-01-01T23:59:59.000Z

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


381

INNOVATIVE ELECTROMAGNETIC SENSORS FOR PIPELINE CRAWLERS  

SciTech Connect (OSTI)

Internal inspection of pipelines is an important tool for ensuring safe and reliable delivery of fossil energy products. Current inspection systems that are propelled through the pipeline by the product flow cannot be used to inspect all pipelines because of the various physical barriers they encounter. Recent development efforts include a new generation of powered inspection platforms that crawl slowly inside a pipeline and are able to maneuver past the physical barriers that can limit inspection. At Battelle, innovative electromagnetic sensors are being designed and tested for these new pipeline crawlers. The various sensor types can be used to assess a wide range of pipeline anomalies including corrosion, mechanical damage, and cracks. The Applied Energy Systems Group at Battelle is concluding the first year of work on a projected three-year development effort. In this first year, two innovative electromagnetic inspection technologies were designed and tested. Both were based on moving high-strength permanent magnets to generate inspection energy. One system involved translating permanent magnets towards the pipe. A pulse of electric current would be induced in the pipe to oppose the magnetization according to Lenz's Law. The decay of this pulse would indicate the presence of defects in the pipe wall. This inspection method is similar to pulsed eddy current inspection methods, with the fundamental difference being the manner in which the current is generated. Details of this development effort were reported in the first semiannual report on this project. This second semiannual report focuses on the development of a second inspection methodology, based on rotating permanent magnets. During this period, a rotating permanent magnet exciter was designed and built. The exciter unit produces strong eddy currents in the pipe wall. The tests have shown that at distances of a pipe diameter or more, the currents flow circumferentially, and that these circumferential currents are deflected by pipeline defects such as corrosion and axially aligned cracks. Simple sensors are used to detect the change in current densities in the pipe wall.

J. Bruce Nestleroth

2004-11-05T23:59:59.000Z

382

Analysing student engagement with learning and tutoring activities in networked learning communities: a multi-method approach  

Science Journals Connector (OSTI)

The aim of this paper is to study the nature of teaching and learning processes in two Networked Learning Communities (NLCs). The study undertakes empirical work using a multi-method approach in order to triangulate and contextualise our findings and enrich our understanding of the student participation in these NLCs. We apply Social Network Analysis (SNA) to visualise the social structure of the NLC, Content Analysis (CA) to identify learning and teaching processes and Context Analysis (CxA) to study students' personal experiences and intentions. The paper reports some of the current findings of this work and discusses future prospects. This paper is part of a continuing international study that is investigating networked collaborative learning among a community of learners engaged in a master's programme in e-learning.

Maarten De Laat; Vic Lally; Lasse Lipponen; Robert-Jan Simons

2006-01-01T23:59:59.000Z

383

Molecular oxygen sensors based on photoluminescent silica aerogels  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Molecular oxygen sensors based on photoluminescent silica aerogels Molecular oxygen sensors based on photoluminescent silica aerogels Title Molecular oxygen sensors based on photoluminescent silica aerogels Publication Type Journal Article Year of Publication 1998 Authors Ayers, Michael R., and Arlon J. Hunt Journal Journal of Non-Crystalline Solids Volume 225 Pagination 343-347 Keywords aerogel, air pressure, oxygen concentration, oxygen molecules, photoluminescence Abstract Photoluminescent silica aerogel acts as the active element of an optical sensor for molecular oxygen. The luminescent aerogel is prepared by the action of energized reducing gases on a standard silica aerogel. Intensity of aerogel photoluminescence decreases as the collision frequency between oxygen molecules and the luminescent carriers in the aerogel matrix increases. This behavior is a characteristic of many photoluminescent materials and arises from a transfer of energy from the aerogel to surrounding oxygen molecules. A sensor for oxygen concentration or air pressure can therefore be simply constructed utilizing an ultraviolet source for excitation and a suitable detector for the emitted visible signal. Stern-Volmer quenching constants for the aerogel sensing element are 1.55×10-2 Torr-1 for hydrophilic aerogel and 2.4×10-3 Torr-1 for hydrophobic aerogel.

384

Development Of An Acoustice Sensor For On-Line Gas Temperature Measurement In Gasifiers  

SciTech Connect (OSTI)

This project was awarded under U.S. Department of Energy (DOE) National Energy Technology Laboratory (NETL) Program Solicitation DE-PS26-02NT41422 and specifically addresses Technical Topical Area 2 - Gasification Technologies. The project team includes Enertechnix, Inc. as the main contractor and ConocoPhillips Company as a technical partner, who also provides access to the SG Solutions Gasification Facility (formerly Wabash River Energy Limited), host for the field-testing portion of the research. The objective of this project was to adapt acoustic pyrometer technology to make it suitable for measuring gas temperature inside a coal gasifier, to develop a prototype sensor based on this technology, and to demonstrate its performance through testing on a commercial gasifier. The project was organized in three phases, each of approximately one year duration. The first phase consisted of researching a variety of sound generation and coupling approaches suitable for use with a high pressure process, evaluation of the impact of gas composition variability on the acoustic temperature measurement approach, evaluation of the impact of suspended particles and gas properties on sound attenuation, evaluation of slagging issues and development of concepts to deal with this issue, development and testing of key prototype components to allow selection of the best approaches, and development of a conceptual design for a field prototype sensor that could be tested on an operating gasifier. The second phase consisted of designing and fabricating a series of prototype sensors, testing them in the laboratory, and developing a conceptual design for a field prototype sensor. The third phase consisted of designing and fabricating the field prototype, and testing it in the lab and in a commercial gasifier to demonstrate the ability to obtain accurate measurements of gas temperature in an operating gasifier. This report describes all of the activities conducted during the project and reports the findings of each activity in detail. The investigation of potential sound generation and coupling methods led to the selection of a reflected shock method which has been developed into a functioning prototype device. The principles of operation of this device and its performance characteristics are described in the report. Modeling of the attenuation of sound by suspended particles and by interaction of the sound pulses with the high temperature syngas inside the gasifier was conducted and the predictions of those models were used to determine the required sound pulse intensity to allow the sound pulses to be detected after passage through the gasifier environment. These modeling results are presented in this report. A study of the likely spatial and temporal variability of gas composition inside the gasifier was performed and the results of that study was used to predict the impact of that variability on the accuracy of the acoustic temperature method. These results are reported here. A design for a port rodding mechanism was developed to deal with potential slagging issues and was incorporated into the prototype sensor. This port rodding mechanism operated flawlessly during the field testing, but because these tests were performed in a region of the gasifier that experiences little slagging, the effectiveness of the rodding mechanism in dealing with highly slagging conditions was not fully demonstrated. This report describes the design and operation of the automated Gasifier Acoustic Pyrometer (autoGAP) which was tested at the Wabash River facility. The results of the tests are reported and analyzed in detail. All of the objectives of the project have been achieved. A field prototype acoustic pyrometer sensor has been successfully tested at the Wabash River gasifier plant. Acoustic signals were propagated through the gases inside the gasifier and were detected by the receiver unit, the times of flight of these sound pulses were measured and these propagation times were converted into temperatures which agreed very well with thermocouple measurements m

Peter Ariessohn; Hans Hornung

2006-10-01T23:59:59.000Z

385

Method of making gold thiolate and photochemically functionalized microcantilevers  

DOE Patents [OSTI]

Highly sensitive sensor platforms for the detection of specific reagents, such as chromate, gasoline and biological species, using microcantilevers and other microelectromechanical systems (MEMS) whose surfaces have been modified with photochemically attached organic monolayers, such as self-assembled monolayers (SAM), or gold-thiol surface linkage are taught. The microcantilever sensors use photochemical hydrosilylation to modify silicon surfaces and gold-thiol chemistry to modify metallic surfaces thereby enabling individual microcantilevers in multicantilever array chips to be modified separately. Terminal vinyl substituted hydrocarbons with a variety of molecular recognition sites can be attached to the surface of silicon via the photochemical hydrosilylation process. By focusing the activating UV light sequentially on selected silicon or silicon nitride hydrogen terminated surfaces and soaking or spotting selected metallic surfaces with organic thiols, sulfides, or disulfides, the microcantilevers are functionalized. The device and photochemical method are intended to be integrated into systems for detecting specific agents including chromate groundwater contamination, gasoline, and biological species.

Boiadjiev, Vassil I. (Knoxville, TN) [Knoxville, TN; Brown, Gilbert M. (Knoxville, TN) [Knoxville, TN; Pinnaduwage, Lal A. (Knoxville, TN) [Knoxville, TN; Thundat, Thomas G. (Knoxville, TN) [Knoxville, TN; Bonnesen, Peter V. (Knoxville, TN) [Knoxville, TN; Goretzki, Gudrun (Nottingham, GB) [Nottingham, GB

2009-08-25T23:59:59.000Z

386

Detection of magnetic resonance signals using a magnetoresistive sensor  

DOE Patents [OSTI]

A method and apparatus are described wherein a micro sample of a fluidic material may be assayed without sample contamination using NMR techniques, in combination with magnetoresistive sensors. The fluidic material to be assayed is first subject to pre-polarization, in one embodiment, by passage through a magnetic field. The magnetization of the fluidic material is then subject to an encoding process, in one embodiment an rf-induced inversion by passage through an adiabatic fast-passage module. Thereafter, the changes in magnetization are detected by a pair of solid-state magnetoresistive sensors arranged in gradiometer mode. Miniaturization is afforded by the close spacing of the various modules.

Budker, Dmitry; Pines, Alexander; Xu, Shoujun; Hilty, Christian; Ledbetter, Micah P; Bouchard, Louis S

2013-10-01T23:59:59.000Z

387

Virtual Oxygen Sensor for Innovative NOx and PM Emission Control...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Virtual Oxygen Sensor for Innovative NOx and PM Emission Control Technologies Virtual Oxygen Sensor for Innovative NOx and PM Emission Control Technologies A virtual O2 sensor for...

388

Template:ExplorationActivity | Open Energy Information  

Open Energy Info (EERE)

ExplorationActivity ExplorationActivity Jump to: navigation, search This is the 'ExplorationActivity' template. To define a new Exploration Activity, please use the Exploration Activity Form. Parameters Name - The name of the activity (typically a combination of the techniques and location, ex. Water Sampling at McCredie Hot Springs) Technique - The exploration technique used in this activity SpectralSensor - The spectral imaging sensor used in this activity Place - The name of the exploration field or location of the activity Notes - General notes about the activity (optional) Outcome - A short description of the benefit or usefulness of the activity Reference_material - The reference material documenting the activity ExpActivityDate - Date or year activity started ExpActivityDateEnd - Date or year activity ended

389

DESIGN OF TEMPERATURE SENSOR ARRAY IN SMART ELECTRIC GRID BASED ON SAW RESONATORS  

E-Print Network [OSTI]

and electrical equipment connected at high voltage switchgear contacts, dry-type transformers, the overhead line, discrete Hartley Transform (DHT) and the method of fast searching center frequency of sensors by comparison

Wang, Ji

390

On Energy for Progressive and Consensus Estimation in Multihop Sensor Networks  

E-Print Network [OSTI]

energy and power plan- ning, multihop sensor networks, network with routing tree,with routing tree. Using the exact energy model and takingenergy planning algorithm for a progressive estimation method which exploits routing tree

Huang, Yi; Hua, Yingbo

2011-01-01T23:59:59.000Z

391

Label-free carbon nanotube sensors for glycan and protein detection  

E-Print Network [OSTI]

Nanoengineered glycan sensors may help realize the long-held goal of accurate and rapid glycoprotein profiling without labeling or glycan liberation steps. Current methods of profiling oligosaccharides displayed on protein ...

Reuel, Nigel F. (Nigel Forest)

2014-01-01T23:59:59.000Z

392

Variance estimation for radiation analysis and multi-sensor fusion.  

SciTech Connect (OSTI)

Variance estimates that are used in the analysis of radiation measurements must represent all of the measurement and computational uncertainties in order to obtain accurate parameter and uncertainty estimates. This report describes an approach for estimating components of the variance associated with both statistical and computational uncertainties. A multi-sensor fusion method is presented that renders parameter estimates for one-dimensional source models based on input from different types of sensors. Data obtained with multiple types of sensors improve the accuracy of the parameter estimates, and inconsistencies in measurements are also reflected in the uncertainties for the estimated parameter. Specific analysis examples are presented that incorporate a single gross neutron measurement with gamma-ray spectra that contain thousands of channels. The parameter estimation approach is tolerant of computational errors associated with detector response functions and source model approximations.

Mitchell, Dean James

2010-09-01T23:59:59.000Z

393

Seismic Activity of the Earth, the Cosmological Vectorial Potential And Method of a Short-term Earthquakes Forecasting  

E-Print Network [OSTI]

To the foundation of a principally new short-term forecasting method there has been laid down a theory of surrounding us world's creation and of physical vacuum as a result of interaction of byuons - discrete objects. The definition of the byuon contains the cosmological vector-potential A_g - a novel fundamental vector constant. This theory predicts a new anisotropic interaction of nature objects with the physical vacuum. A peculiar "tap" to gain new energy (giving rise to an earthquake) are elementary particles because their masses are proportional to the modulus of some summary potential A_sum that contains potentials of all known fields. The value of A_sum cannot be larger than the modulus of A_g. In accordance with the experimental results a new force associated with A_sum ejects substance from the area of the weakened A_sum along a conical formation with the opening of 100 +- 10 and the axis directed along the vector A_sum. This vector has the following coordinates in the second equatorial coordinate system: right ascension alpha = 293 +- 10, declination delta = 36 +- 10. Nearly 100% probability of an earthquake (earthquakes of 6 points strong and more by the Richter scale) arises when in the process of the earth rotation the zenith vector of a seismically dangerous region and/or the vectorial potential of Earth's magnetic fields are in a certain way oriented relative to the vector A_g. In the work, basic models and standard mechanisms of earthquakes are briefly considered, results of processing of information on the earthquakes in the context of global spatial anisotropy caused by the existence of the vector A_g, are presented, and an analysis of them is given.

Yu. A. Baurov; Yu. A. Baurov; Yu. A. Baurov Jr.; A. A. Spitalnaya; A. A. Abramyan; V. A. Solodovnikov

2008-08-20T23:59:59.000Z

394

New Electronic Sensors Stick to Your Skin -Heart Rate Monitors -Popular Mechanics http://www.popularmechanics.com/science/health/breakthroughs/new-electronic-sensors-stick-to-your-skin?click=pm_latest[8/14/2011 5:59:45 AM  

E-Print Network [OSTI]

New Electronic Sensors Stick to Your Skin - Heart Rate Monitors - Popular Mechanics http://www Electronic Sensors That Stick to Your Skin Like Temporary Tattoos Nice tattoo. Or is it a heart-rate monitor to measure the electrical activity of the heart, muscles and brain. And using the same principles behind

Rogers, John A.

395

Activity Based Costing  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

Activity Based Costing (ABC) is method for developing cost estimates in which the project is subdivided into discrete, quantifiable activities or a work unit. This chapter outlines the Activity Based Costing method and discusses applicable uses of ABC.

1997-03-28T23:59:59.000Z

396

752 IEEE SENSORS JOURNAL, VOL. 9, NO. 7, JULY 2009 Which Photodiode to Use: A Comparison of  

E-Print Network [OSTI]

752 IEEE SENSORS JOURNAL, VOL. 9, NO. 7, JULY 2009 Which Photodiode to Use: A Comparison of CMOS architecture and the photosensitive structure. This paper presents a comparison of three photodiode structures active pixel sensor, where the output depends on the photodiode capacitance, and one incorporating an in

Cauwenberghs, Gert

397

INNOVATIVE ELECTROMAGNETIC SENSORS FOR PIPELINE CRAWLERS  

SciTech Connect (OSTI)

Internal inspection of pipelines is an important tool for ensuring safe and reliable delivery of fossil energy products. Current inspection systems that are propelled through the pipeline by the product flow cannot be used to inspect all pipelines because of the various physical barriers they encounter. Recent development efforts include a new generation of powered inspection platforms that crawl slowly inside a pipeline and are able to maneuver past the physical barriers that can limit inspection. At Battelle, innovative electromagnetic sensors are being designed and tested for these new pipeline crawlers. The various sensor types can be used to assess a wide range of pipeline anomalies including corrosion, mechanical damage, and cracks. The Applied Energy Systems Group at Battelle is in the second year of work on a projected three-year development effort. In the first year, two innovative electromagnetic inspection technologies were designed and tested. Both were based on moving high-strength permanent magnets to generate inspection energy. One system involved translating permanent magnets towards the pipe. A pulse of electric current would be induced in the pipe to oppose the magnetization according to Lenz's Law. The decay of this pulse would indicate the presence of defects in the pipe wall. This inspection method is similar to pulsed eddy current inspection methods, with the fundamental difference being the manner in which the current is generated. Details of this development effort were reported in the first semiannual report on this project. The second inspection methodology is based on rotating permanent magnets. The rotating exciter unit produces strong eddy currents in the pipe wall. At distances of a pipe diameter or more from the rotating exciter, the currents flow circumferentially. These circumferential currents are deflected by pipeline defects such as corrosion and axially aligned cracks. Simple sensors are used to detect the change in current densities in the pipe wall. The second semiannual report on this project reported on experimental and modeling results. The results showed that the rotating system was more adaptable to pipeline inspection and therefore only this system will be carried into the second year of the sensor development. In this third reporting period, the rotating system inspection was further developed. Since this is a new inspection modality without published fundamentals to build upon, basic analytical and experimental investigations were performed. A closed form equation for designing rotating exciters and positioning sensors was derived from fundamental principles. Also signal processing methods were investigated for detection and assessment of pipeline anomalies. A lock in amplifier approach was chosen as the method for detecting the signals. Finally, mechanical implementations for passing tight restrictions such as plug valves were investigated. This inspection concept is new and unique; a United States patent application has been submitted.

J. Bruce Nestleroth; Richard J. Davis

2005-05-23T23:59:59.000Z

398

INNOVATIVE ELECTROMAGNETIC SENSORS FOR PIPELINE CRAWLERS  

SciTech Connect (OSTI)

Internal inspection of pipelines is an important tool for ensuring safe and reliable delivery of fossil energy products. Current inspection systems that are propelled through the pipeline by the product flow cannot be used to inspect all pipelines because of the various physical barriers they encounter. Recent development efforts include a new generation of powered inspection platforms that crawl slowly inside a pipeline and are able to maneuver past the physical barriers that can limit inspection. At Battelle, innovative electromagnetic sensors are being designed and tested for these new pipeline crawlers. The various sensor types can be used to assess a wide range of pipeline anomalies including corrosion, mechanical damage, and cracks. Battelle has completed the second year of work on a projected three-year development effort. In the first year, two innovative electromagnetic inspection technologies were designed and tested. Both were based on moving high-strength permanent magnets to generate inspection energy. One system involved translating permanent magnets towards the pipe. A pulse of electric current would be induced in the pipe to oppose the magnetization according to Lenz's Law. The decay of this pulse would indicate the presence of defects in the pipe wall. This inspection method is similar to pulsed eddy current inspection methods, with the fundamental difference being the manner in which the current is generated. Details of this development effort were reported in the first semiannual report on this project. The second inspection methodology is based on rotating permanent magnets. The rotating exciter unit produces strong eddy currents in the pipe wall. At distances of a pipe diameter or more from the rotating exciter, the currents flow circumferentially. These circumferential currents are deflected by pipeline defects such as corrosion and axially aligned cracks. Simple sensors are used to detect the change in current densities in the pipe wall. The second semiannual report on this project reported on experimental and modeling results. The results showed that the rotating system was more adaptable to pipeline inspection and therefore only this system will be carried into the second year of the sensor development. In the third reporting period, the rotating system inspection was further developed. Since this is a new inspection modality without published fundamentals to build upon, basic analytical and experimental investigations were performed. A closed form equation for designing rotating exciters and positioning sensors was derived from fundamental principles. Also signal processing methods were investigated for detection and assessment of pipeline anomalies. A lock in amplifier approach was chosen as the method for detecting the signals. Finally, mechanical implementations for passing tight restrictions such as plug valves were investigated. This inspection concept is new and unique; a United States patent application has been submitted. In this fourth reporting period, the rotating system inspection was further developed. A multichannel real-time data recorder system was implemented and fundamental experiments were conducted to provide data to aid in the design of the rotating magnetizer system. An unexpected but beneficial result was achieved when examining the separation between the rotating magnet and the pipe wall; separations of over an inch could be tolerated. Essentially no change in signal from corrosion anomalies could be detected for separations up to 1.35 inches. The results presented in this report will be used to achieve the next deliverable, designs of components of the rotating inspection system that will function with inspection crawlers in a pipeline environment.

J. Bruce Nestleroth

2005-11-30T23:59:59.000Z

399

Innovative Electromagnetic Sensors for Pipeline Crawlers  

SciTech Connect (OSTI)

Internal inspection of pipelines is an important tool for ensuring safe and reliable delivery of fossil energy products. Current inspection systems that are propelled through the pipeline by the product flow cannot be used to inspect all pipelines because of the various physical barriers they encounter. Recent development efforts include a new generation of powered inspection platforms that crawl slowly inside a pipeline and are able to maneuver past the physical barriers that can limit inspection. At Battelle, innovative electromagnetic sensors are being designed and tested for these new pipeline crawlers. The various sensor types can be used to assess a wide range of pipeline anomalies including corrosion, mechanical damage, and cracks. Battelle is in the final year on a projected three-year development effort. In the first year, two innovative electromagnetic inspection technologies were designed and tested. Both were based on moving high-strength permanent magnets to generate inspection energy. One system involved translating permanent magnets towards the pipe. A pulse of electric current would be induced in the pipe to oppose the magnetization according to Lenz's Law. The decay of this pulse would indicate the presence of defects in the pipe wall. This inspection method is similar to pulsed eddy current inspection methods, with the fundamental difference being the manner in which the current is generated. Details of this development effort were reported in the first semiannual report on this project. The second inspection methodology is based on rotating permanent magnets. The rotating exciter unit produces strong eddy currents in the pipe wall. At distances of a pipe diameter or more from the rotating exciter, the currents flow circumferentially. These circumferential currents are deflected by pipeline defects such as corrosion and axially aligned cracks. Simple sensors are used to detect the change in current densities in the pipe wall. The second semiannual report on this project reported on experimental and modeling results. The results showed that the rotating system was more adaptable to pipeline inspection and therefore only this system will be carried into the second year of the sensor development. In the third reporting period, the rotating system inspection was further developed. Since this is a new inspection modality without published fundamentals to build upon, basic analytical and experimental investigations were performed. A closed form equation for designing rotating exciters and positioning sensors was derived from fundamental principles. Also signal processing methods were investigated for detection and assessment of pipeline anomalies. A lock in amplifier approach was chosen as the method for detecting the signals. Finally, mechanical implementations for passing tight restrictions such as plug valves were investigated. This inspection concept is new and unique; a United States patent application has been submitted. In this reporting period, a general design of the rotating permanent magnet inspection system is presented. The rotating permanent magnet inspection system is feasible for pipes ranging in diameter from 8 to 18 inches using a two pole configuration. Experimental results and theoretical calculations provide the basis for selection of the critical design parameters. The parameters include a significant magnet to pipe separation that will facilitate the passage of pipeline features. With the basic values of critical components established, the next step is a detailed mechanical design of a pipeline ready inspection system.

J. Bruce Nestleroth

2006-05-04T23:59:59.000Z

400

Obtaining accurate measurement using redundant sensors  

E-Print Network [OSTI]

Conventional wisdom suggests to accomplish accurate measurement, the sensors used must have high precision and excellent dynamic range. This generally results in sensor systems that are complex, costly, and often sensitive to environmental factors...

Burnett, Michael Scott

2012-06-07T23:59:59.000Z

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


401

Multipurpose Acoustic Sensor for Downhole Fluid Monitoring  

Broader source: Energy.gov [DOE]

Novel sensor design based on acoustics. Determine in real-timeand in a single sensor packagemultiple parameters: temperature, pressure, fluid flow; and fluid properties, such as density, viscosity, fluid composition.

402

Three sun sensors for stratospheric balloon payloads  

Science Journals Connector (OSTI)

We describe three sun sensors which have been developed for balloon borne experiments. The sensors have different resolutions and sky coverage and have been developed and used in the BOOMERanG project.

G. Romeo; P. de Bernardis; G. Di Stefano; S. Masi; F. Piacentini; F. Pongetti; S. Rao

2002-01-01T23:59:59.000Z

403

Design guidelines for optical resonator biochemical sensors  

E-Print Network [OSTI]

In this paper, we propose a design tool for dielectric optical resonator-based biochemical refractometry sensors. Analogous to the widely accepted photodetector figure of merit, the detectivity D*, we introduce a new sensor ...

Kimerling, Lionel C.

404

Automatic Calibration of Multiple Coplanar Sensors  

E-Print Network [OSTI]

This paper describes an algorithm for recovering the rigid 3-DOF transformation (offset and rotation) between pairs of sensors mounted rigidly in a common plane on a mobile robot. The algorithm requires only a set of sensor ...

Brookshire, Jonathan

405

Nanocomposite Flexible Pressure Sensor for Biomedical Applications  

E-Print Network [OSTI]

A new approach for the fabrication of flexible pressure sensors based on aligned carbon nanotubes (A-CNTs) is described in this paper. The technology is suitable for blood pressure sensors that can be attached to a stent-graft ...

Fachin, F.

406

Utilizing Solar Power in Wireless Sensor Networks  

Science Journals Connector (OSTI)

Sensor networks are designed especially for deploymentin adverse and non-accessible areas without a fixed infrastructure.Therefore, energy conservation plays a crucialrole for these networks. We propose to utilize solar powerin wireless sensor networks, ...

Thiemo Voigt; Hartmut Ritter; Jochen Schiller

2003-10-01T23:59:59.000Z

407

Nanojunction Sensors for the Detection of chemical and Biological...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and biological sensors, magnetoresistive sensors and molecular electronic and optoelectronic devices. This invention can turn these applications into commercial...

408

Minimum energy decentralized estimation in a wireless sensor network with correlated sensor noises  

Science Journals Connector (OSTI)

Consider the problem of estimating an unknown parameter by a sensor network with a fusion center (FC). Sensor observations are corrupted by additive noises with an arbitrary spatial correlation. Due to bandwidth and energy limitation, each sensor is ... Keywords: decentralized estimation, energy efficiency, power control, wireless sensor networks

Alexey Krasnopeev; Jin-Jun Xiao; Zhi-Quan Luo

2005-09-01T23:59:59.000Z

409

IEEE SENSORS JOURNAL, VOL. 13, NO. 9, SEPTEMBER 2013 3405 A Soft Strain Sensor Based on  

E-Print Network [OSTI]

IEEE SENSORS JOURNAL, VOL. 13, NO. 9, SEPTEMBER 2013 3405 A Soft Strain Sensor Based on Ionic and Vincent Duchaine Abstract--A novel soft strain sensor capable of withstand- ing strains of up to 100% is described. The sensor is made of a hyperelastic silicone elastomer that contains embedded microchannels

Park, Yong-Lae

410

Sensors and Actuators A xxx (2004) xxxxxx Micromachined silicon force sensor based on diffractive optical  

E-Print Network [OSTI]

Sensors and Actuators A xxx (2004) xxx­xxx Micromachined silicon force sensor based on diffractive-based force sensor integrated with a surface micromachined silicon-nitride probe for penetration and injection that is designed to only be sensitive to axial deflections of the probe. The optical-encoder force sensor exhibits

Quake, Stephen R.

411

CCEC Seminar Wireless Sensors for SemiconductorWireless Sensors for Semiconductor  

E-Print Network [OSTI]

CCEC Seminar Wireless Sensors for SemiconductorWireless Sensors for Semiconductor Manufacturing perhaps. In this talk, we describe our efforts in developing a new class of wireless sensors for use in semiconductor manufacturing. These sensors are fully self-contained with on board power, communications

Akhmedov, Azer

412

Ionizing Radiation Activates AMP-Activated Kinase (AMPK): A Target for Radiosensitization of Human Cancer Cells  

SciTech Connect (OSTI)

Purpose: Adenosine monophosphate (AMP)-activated kinase (AMPK) is a molecular energy sensor regulated by the tumor suppressor LKB1. Starvation and growth factors activate AMPK through the DNA damage sensor ataxia-telangiectasia mutated (ATM). We explored the regulation of AMPK by ionizing radiation (IR) and its role as a target for radiosensitization of human cancer cells. Methods and Materials: Lung, prostate, and breast cancer cells were treated with IR (2-8 Gy) after incubation with either ATM or AMPK inhibitors or the AMPK activator metformin. Then, cells were subjected to either lysis and immunoblotting, immunofluorescence microscopy, clonogenic survival assays, or cell cycle analysis. Results: IR induced a robust phosphorylation and activation of AMPK in all tumor cells, independent of LKB1. IR activated AMPK first in the nucleus, and this extended later into cytoplasm. The ATM inhibitor KU-55933 blocked IR activation of AMPK. AMPK inhibition with Compound C or anti-AMPK {alpha} subunit small interfering RNA (siRNA) blocked IR induction of the cell cycle regulators p53 and p21{sup waf/cip} as well as the IR-induced G2/M arrest. Compound C caused resistance to IR, increasing the surviving fraction after 2 Gy, but the anti-diabetic drug metformin enhanced IR activation of AMPK and lowered the surviving fraction after 2 Gy further. Conclusions: We provide evidence that IR activates AMPK in human cancer cells in an LKB1-independent manner, leading to induction of p21{sup waf/cip} and regulation of the cell cycle and survival. AMPK appears to (1) participate in an ATM-AMPK-p21{sup waf/cip} pathway, (2) be involved in regulation of the IR-induced G2/M checkpoint, and (3) may be targeted by metformin to enhance IR responses.

Sanli, Toran; Rashid, Ayesha; Liu Caiqiong [Department of Oncology, Juravinski Cancer Center and McMaster University, Hamilton, Ontario (Canada)

2010-09-01T23:59:59.000Z

413

High pressure fiber optic sensor system  

DOE Patents [OSTI]

The present application provides a fiber optic sensor system. The fiber optic sensor system may include a small diameter bellows, a large diameter bellows, and a fiber optic pressure sensor attached to the small diameter bellows. Contraction of the large diameter bellows under an applied pressure may cause the small diameter bellows to expand such that the fiber optic pressure sensor may measure the applied pressure.

Guida, Renato; Xia, Hua; Lee, Boon K; Dekate, Sachin N

2013-11-26T23:59:59.000Z

414

An adaptive elliptical anomaly detection model for wireless sensor networks  

Science Journals Connector (OSTI)

Abstract Wireless Sensor Networks (WSNs) provide a low cost option for monitoring different environments such as farms, forests and water and electricity networks. However, the restricted energy resources of the network impede the collection of raw monitoring data from all the nodes to a single location for analysis. This has stimulated research into efficient anomaly detection techniques to extract information about unusual events such as malicious attacks or faulty sensors at each node. Many previous anomaly detection methods have relied on centralized processing of measurement data, which is highly communication intensive. In this paper, we present an efficient algorithm to detect anomalies in a decentralized manner. In particular, we propose a novel adaptive model for anomaly detection, as well as a robust method for modeling normal behavior. Our evaluation results on both real-life and simulated data sets demonstrate the accuracy of our approach compared to existing methods.

Masud Moshtaghi; Christopher Leckie; Shanika Karunasekera; Sutharshan Rajasegarar

2014-01-01T23:59:59.000Z

415

Sensors 2002, 2, 244-257 ISSN 1424-8220  

E-Print Network [OSTI]

Sensors 2002, 2, 244-257 sensors ISSN 1424-8220 © 2002 by MDPI http://www.mdpi.net/sensors Invited Paper Communication Buses and Protocols for Sensor Networks Junwei Zhou and Andrew Mason* Department communication buses which are commonly used in sensor networks, discusses sensor network architectures

Mason, Andrew

416

Side-emitting fiber optic position sensor  

DOE Patents [OSTI]

A side-emitting fiber optic position sensor and method of determining an unknown position of an object by using the sensor. In one embodiment, a concentrated beam of light source illuminates the side of a side-emitting fiber optic at an unknown axial position along the fiber's length. Some of this side-illuminated light is in-scattered into the fiber and captured. As the captured light is guided down the fiber, its intensity decreases due to loss from side-emission away from the fiber and from bulk absorption within the fiber. By measuring the intensity of light emitted from one (or both) ends of the fiber with a photodetector(s), the axial position of the light source is determined by comparing the photodetector's signal to a calibrated response curve, look-up table, or by using a mathematical model. Alternatively, the side-emitting fiber is illuminated at one end, while a photodetector measures the intensity of light emitted from the side of the fiber, at an unknown position. As the photodetector moves further away from the illuminated end, the detector's signal strength decreases due to loss from side-emission and/or bulk absorption. As before, the detector's signal is correlated to a unique position along the fiber.

Weiss, Jonathan D. (Albuquerque, NM)

2008-02-12T23:59:59.000Z

417

Fiber-optic liquid level sensor  

DOE Patents [OSTI]

A fiber-optic liquid level sensor measures the height of a column of liquid through the hydrostatic pressure it produces. The sensor employs a fiber-optic displacement sensor to detect the pressure-induced displacement of the center of a corrugated diaphragm.

Weiss, Jonathan D. (Albuquerque, NM)

1991-01-01T23:59:59.000Z

418

SIA: Secure information aggregation in sensor networks  

Science Journals Connector (OSTI)

In sensor networks, data aggregation is a vital primitive enabling efficient data queries. An on-site aggregator device collects data from sensor nodes and produces a condensed summary which is forwarded to the off-site querier, thus reducing the communication ... Keywords: Sensor networks, approximate interactive proofs, information aggregation, security

Haowen Chan; Adrian Perrig; Bartosz Przydatek; Dawn Song

2007-01-01T23:59:59.000Z

419

Wireless sensor networks and environmental monitoring applications  

E-Print Network [OSTI]

Radio: 4kbps, 180m Sensors: Light and accelerometer Energy: Solar powered Golem and deputy dust 16mm3-aided medicine Data processing in wireless sensor networks Facilities: Cluster of 16 computers 30 ultra low power wireless sensors Lego robotics lab (10 Mindstorms kits) More to come... (mobile robot, Mindstorms NXT kits

Le Borgne, Yann-Aël

420

Compressive Computation in Analog VLSI Motion Sensors  

E-Print Network [OSTI]

Compressive Computation in Analog VLSI Motion Sensors Rainer A. Deutschmann1 and Oliver G. Wenisch2 analog VLSI mo- tion sensors developed in the past. We show how their pixel-parallel architecture can is best suited to perform the algorithm even at high noise levels. 1 Analog VLSI Motion Sensors Inthe past

Deutschmann, Rainer

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


421

700:20131001.1211 Fine Sun Sensor  

E-Print Network [OSTI]

700:20131001.1211 Fine Sun Sensor The Laboratory for Atmospheric and Space Physics (LASP) at the University of Colorado, Boulder is a world leader in space-based research including measurements of the Sun with respect to sun center. LASP has built sun position sensors for decades beginning with sensors for sub

Mojzsis, Stephen J.

422

Energy management in sensor networks  

Science Journals Connector (OSTI)

...sensor networks are based on solar cells, such as Heliomote...design a highly efficient solar-based harvesting system, these solar-based designs need to employ...achieves a maximum value. (b) Energy storage According to the type of...

2012-01-01T23:59:59.000Z

423

Centdian computation for sensor networks  

Science Journals Connector (OSTI)

This paper focuses on the centdian problem in a cactus network where a cactus network is a connected undirected graph, and any two simple cycles in the graph have at most one node in common The cactus network has important applications for wireless ... Keywords: cactus graph, centdian node, distributed algorithm, sensor network

Boaz Ben-Moshe; Amit Dvir; Michael Segal; Arie Tamir

2010-06-01T23:59:59.000Z

424

Fiber optic coupled optical sensor  

DOE Patents [OSTI]

A displacement sensor includes a first optical fiber for radiating light to a target, and a second optical fiber for receiving light from the target. The end of the first fiber is adjacent and not axially aligned with the second fiber end. A lens focuses light from the first fiber onto the target and light from the target onto the second fiber.

Fleming, Kevin J. (Albuquerque, NM)

2001-01-01T23:59:59.000Z

425

Sensors, Controls, & Transactional Network Reports  

Broader source: Energy.gov [DOE]

Reports from the sensors, controls, and transactional network program. The transactional network is between appliances, buildings, and utilities, and can enable Smart Buildings -- buildings with technologies and control systems that can not only optimize energy performance and comfort, but also support energy-related transactions outside the building envelope.

426

SO.sub.2 sensor  

DOE Patents [OSTI]

This invention is a process for detecting low concentration levels of sulfur oxides (SO.sub.2) in a flowing gas stream (typically a combustion exhaust gas stream) and a catalytic SO.sub.2 sensor system which may be used in that process.

Dalla Betta, Ralph A. (Mountain View, CA); Sheridan, David R. (Menlo Park, CA)

1994-01-01T23:59:59.000Z

427

Battery system with temperature sensors  

DOE Patents [OSTI]

A battery system to monitor temperature includes at least one cell with a temperature sensing device proximate the at least one cell. The battery system also includes a flexible member that holds the temperature sensor proximate to the at least one cell.

Wood, Steven J.; Trester, Dale B.

2012-11-13T23:59:59.000Z

428

Application of Artificial Neural Network Modeling to the Analysis of the Automated Radioxenon Sampler-Analyzer State Of Health Sensors OF HEALTH SENSORS  

SciTech Connect (OSTI)

The Automated Radioxenon Analyzer/Sampler (ARSA) is a radioxenon gas collection and analysis system operating autonomously under computer control. The ARSA systems are deployed as part of an international network of sensors, with individual stations feeding radioxenon concentration data to a central data center. Because the ARSA instrument is complex and is often deployed in remote areas, it requires constant self-monitoring to verify that it is operating according to specifications. System performance monitoring is accomplished by over 200 internal sensors, with some values reported to the data center. Several sensors are designated as safety sensors that can automatically shut down the ARSA when unsafe conditions arise. In this case, the data center is advised of the shutdown and the cause, so that repairs may be initiated. The other sensors, called state of health (SOH) sensors, also provide valuable information on the functioning of the ARSA and are particularly useful for detecting impending malfunctions before they occur to avoid unscheduled shutdowns. Any of the sensor readings can be displayed by an ARSA Data Viewer, but interpretation of the data is difficult without specialized technical knowledge not routinely available at the data center. Therefore it would be advantageous to have sensor data automatically evaluated for the precursors of malfunctions and the results transmitted to the data center. Artificial Neural Networks (ANN) are a class of data analysis methods that have shown wide application to monitoring systems with large numbers of information inputs, such as the ARSA. In this work supervised and unsupervised ANN methods were applied to ARSA SOH data recording during normal operation of the instrument, and the ability of ANN methods to predict system state is presented.

Hayes, James C.; Doctor, Pam G.; Heimbigner, Tom R.; Hubbard, Charles W.; Kangas, Lars J.; Keller, Paul E.; McIntyre, Justin I.; Schrom, Brian T.; Suarez, Reynold

2006-09-19T23:59:59.000Z

429

Advanced exterior sensor project : final report, September 2004.  

SciTech Connect (OSTI)

This report (1) summarizes the overall design of the Advanced Exterior Sensor (AES) system to include detailed descriptions of system components, (2) describes the work accomplished throughout FY04 to evaluate the current health of the original prototype and to return it to operation, (3) describes the status of the AES and the AES project as of September 2004, and (4) details activities planned to complete modernization of the system to include development and testing of the second-generation AES prototype.

Ashby, M. Rodema

2004-12-01T23:59:59.000Z

430

Electrochemical methane sensor  

DOE Patents [OSTI]

A method and instrument including an electrochemical cell for the detection and measurement of methane in a gas by the oxidation of methane electrochemically at a working electrode in a nonaqueous electrolyte at a voltage about 1.4 volts vs R.H.E. (the reversible hydrogen electrode potential in the same electrolyte), and the measurement of the electrical signal resulting from the electrochemical oxidation.

Zaromb, S.; Otagawa, T.; Stetter, J.R.

1984-08-27T23:59:59.000Z

431

Single-step multiplex detection of toxic metal ions by Au nanowires-on-chip sensor using reporter elimination  

E-Print Network [OSTI]

Single-step multiplex detection of toxic metal ions by Au nanowires-on-chip sensor using reporter sensitively detect multiple toxic metal ions. Most importantly, the reporter elimination method simplified by using this sensor. 1. Introduction Heavy metal ions such as mercury (Hg2+ ), silver (Ag+ ), and lead (Pb

Kim, Bongsoo

432

Research on Monitoring Wear of Piston Ring Based on Magneto-Resistive Sensor for Marine Diesel Engine  

Science Journals Connector (OSTI)

The method of monitoring the wear of piston ring with a magneto-resistive sensor for a marine diesel engine is presented in the paper. The magnetic field intensity variations caused by both the wear and the motion of piston ring are analyzed by simulation. ... Keywords: Magnetic Field Intensity, Wear of Piston Ring, Magneto-Resistive Sensor, Marine Ddiesel Engine

Zhang-ming Peng; Jian-guo Yang; Qiao-ying Huang; Yong-hua Yu

2011-01-01T23:59:59.000Z

433

Microscale autonomous sensor and communications module  

DOE Patents [OSTI]

Various technologies pertaining to a microscale autonomous sensor and communications module are described herein. Such a module includes a sensor that generates a sensor signal that is indicative of an environmental parameter. An integrated circuit receives the sensor signal and generates an output signal based at least in part upon the sensor signal. An optical emitter receives the output signal and generates an optical signal as a function of the output signal. An energy storage device is configured to provide power to at least the integrated circuit and the optical emitter, and wherein the module has a relatively small diameter and thickness.

Okandan, Murat; Nielson, Gregory N

2014-03-25T23:59:59.000Z

434

Sensors & Controls | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Sensors & Controls Sensors & Controls Sensors & Controls The Emerging Technologies team conducts research into technologies related to building sensors and controls. They work with building systems-such as a heating, ventilation, and air conditioning (HVAC) systems-to analyze energy use and help occupants manage energy costs. Building controls have the potential to reduce building energy consumption by monitoring variables and other inputs, and then automatically responding in a predetermined fashion. Research between the Department of Energy, industry, and laboratories focuses on: Sensors Photo of a ceiling-mounted fire sprinkler. Sensors are designed to help building owners and operators better manage their energy use through automation. Sensors measure predefined variables, such as the amount of

435

Optics-less smart sensors and a possible mechanism of cutaneous vision in nature  

E-Print Network [OSTI]

Optics-less cutaneous (skin) vision is not rare among living organisms, though its mechanisms and capabilities have not been thoroughly investigated. This paper demonstrates, using methods from statistical parameter estimation theory and numerical simulations, that an array of bare sensors with a natural cosine-law angular sensitivity arranged on a flat or curved surface has the ability to perform imaging tasks without any optics at all. The working principle of this type of optics-less sensor and the model developed here for determining sensor performance may be used to shed light upon possible mechanisms and capabilities of cutaneous vision in nature.

Leonid Yaroslavsky; Chad Goerzen; Stanislav Umansky; H. John Caulfield

2008-08-08T23:59:59.000Z

436

Reducing Power Consumption in Wireless Sensor Networks Using a Novel Approach to Data Aggregation  

Science Journals Connector (OSTI)

......Each sensor node is a tiny device composed of three basic units...activity using a low power listening. If the channel is not active...and transmitting messages, listening the radio channel and sleeping...channel adopts a low-power listening (LPL) approach. Figure-2......

Silvio Croce; Francesco Marcelloni; Massimo Vecchio

2008-03-01T23:59:59.000Z

437

Elastomer degradation sensor using a piezoelectric material  

DOE Patents [OSTI]

A method and apparatus for monitoring the degradation of elastomeric materials is provided. Piezoelectric oscillators are placed in contact with the elastomeric material so that a forced harmonic oscillator with damping is formed. The piezoelectric material is connected to an oscillator circuit,. A parameter such as the resonant frequency, amplitude or Q value of the oscillating system is related to the elasticity of the elastomeric material. Degradation of the elastomeric material causes changes in its elasticity which, in turn, causes the resonant frequency, amplitude or Q of the oscillator to change. These changes are monitored with a peak height monitor, frequency counter, Q-meter, spectrum analyzer, or other measurement circuit. Elasticity of elastomers can be monitored in situ, using miniaturized sensors.

Olness, Dolores U. (Livermore, CA); Hirschfeld, deceased, Tomas B. (late of Livermore, CA)

1990-01-01T23:59:59.000Z

438

Laser-based Sensors for Chemical Detection  

SciTech Connect (OSTI)

Stand-off detection of hazardous materials ensures that the responder is located at a safe distance from the suspected source. Remote detection and identification of hazardous materials can be accomplished using a highly sensitive and portable device, at significant distances downwind from the source or the threat. Optical sensing methods, in particular infrared absorption spectroscopy combined with quantum cascade lasers (QCLs), are highly suited for the detection of chemical substances since they enable rapid detection and are amenable for autonomous operation in a compact and rugged package. This talk will discuss the sensor systems developed at Pacific Northwest National Laboratory and will discuss the progress to reduce the size and power while maintaining sensitivity to enable stand-off detection of multiple chemicals.

Myers, Tanya L.; Phillips, Mark C.; Taubman, Matthew S.; Bernacki, Bruce E.; Schiffern, John T.; Cannon, Bret D.

2010-05-10T23:59:59.000Z

439

Fabrication of thermal microphotonic sensors and sensor arrays  

DOE Patents [OSTI]

A thermal microphotonic sensor is fabricated on a silicon substrate by etching an opening and a trench into the substrate, and then filling in the opening and trench with silicon oxide which can be deposited or formed by thermally oxidizing a portion of the silicon substrate surrounding the opening and trench. The silicon oxide forms a support post for an optical resonator which is subsequently formed from a layer of silicon nitride, and also forms a base for an optical waveguide formed from the silicon nitride layer. Part of the silicon substrate can be selectively etched away to elevate the waveguide and resonator. The thermal microphotonic sensor, which is useful to detect infrared radiation via a change in the evanescent coupling of light between the waveguide and resonator, can be formed as a single device or as an array.

Shaw, Michael J. (Tijeras, NM); Watts, Michael R. (Albuquerque, NM); Nielson, Gregory N. (Albuquerque, NM)

2010-10-26T23:59:59.000Z

440

DEVELOPMENT OFA WIRELESS ACTIVE SYSTEM FOR TPS STRUCTURAL HEALTH MONITORING  

E-Print Network [OSTI]

TPS damage. Several essential aspects are being studied: (a) development of high temperature aspects are being studied: (a) development of high temperature piezoelectric wafer active sensor (HTDEVELOPMENT OFA WIRELESS ACTIVE SYSTEM FOR TPS STRUCTURAL HEALTH MONITORING Victor Giurgiutiu1

Giurgiutiu, Victor

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


441

New sensor for measurement of low air flow velocity. Phase I final report  

SciTech Connect (OSTI)

The project described here is the Phase I feasibility study of a two-phase program to integrate existing technologies to provide a system for determining air flow velocity and direction in radiation work areas. Basically, a low air flow sensor referred to as a thermocouple flow sensor has been developed. The sensor uses a thermocouple as its sensing element. The response time of the thermocouple is measured using an existing in-situ method called the Loop Current Step Response (LCSR) test. The response time results are then converted to a flow signal using a response time-versus-flow correlation. The Phase I effort has shown that a strong correlation exists between the response time of small diameter thermocouples and the ambient flow rate. As such, it has been demonstrated that thermocouple flow sensors can be used successfully to measure low air flow rates that can not be measured with conventional flow sensors. While the thermocouple flow sensor developed in this project was very successful in determining air flow velocity, determining air flow direction was beyond the scope of the Phase I project. Nevertheless, work was performed during Phase I to determine how the new flow sensor can be used to determine the direction, as well as the velocity, of ambient air movements. Basically, it is necessary to use either multiple flow sensors or move a single sensor in the monitoring area and make flow measurements at various locations sweeping the area from top to bottom and from left to right. The results can then be used with empirical or physical models, or in terms of directional vectors to estimate air flow patterns. The measurements can be made continuously or periodically to update the flow patterns as they change when people and objects are moved in the monitoring area. The potential for using multiple thermocouple flow sensors for determining air flow patterns will be examined in Phase II.

Hashemian, H.M.; Hashemian, M.; Riggsbee, E.T. [Analysis and Measurement Services Corp., Knoxville, TN (United States)

1995-08-01T23:59:59.000Z

442

Fiber optic moisture sensor  

DOE Patents [OSTI]

A method and apparatus for sensing moisture changes by utilizing optical fiber technology. One embodiment uses a reflective target at the end of an optical fiber. The reflectance of the target varies with its moisture content and can be detected by a remote unit at the opposite end of the fiber. A second embodiment utilizes changes in light loss along the fiber length. This can be attributed to changes in reflectance of cladding material as a function of its moisture content. It can also be affected by holes or inserts interposed in the cladding material and/or fiber. Changing light levels can also be coupled from one fiber to another in an assembly of fibers as a function of varying moisture content in their overlapping lengths of cladding material.

Kirkham, R.R.

1984-08-03T23:59:59.000Z

443

Microcantilever heater-thermometer with integrated temperature-compensated strain sensor  

DOE Patents [OSTI]

The present invention provides microcantilever hotplate devices which incorporate temperature compensating strain sensors. The microcantilever hotplate devices of the present invention comprise microcantilevers having temperature compensating strain sensors and resistive heaters. The present invention also provides methods for using a microcantilever hotplate for temperature compensated surface stress measurements, chemical/biochemical sensing, measuring various properties of compounds adhered to the microcantilever hotplate surface, or for temperature compensated deflection measurements.

King, William P. (Champaign, IL); Lee, Jungchul (Champaign, IL); Goericke, Fabian T. (Wolfsburg, DE)

2011-04-19T23:59:59.000Z

444

Real-Time Spatio-Temporal Query Processing in Mobile Ad-Hoc Sensor Networks  

E-Print Network [OSTI]

that has multiple sensors (e.g., mo- tion sensors, acoustic sensors, infrared light emitting diodes, and pa

445

Evaluating fusion techniques for multi-sensor satellite image data  

SciTech Connect (OSTI)

Satellite image data fusion is a topic of interest in many areas including environmental monitoring, emergency response, and defense. Typically any single satellite sensor cannot provide all of the benefits offered by a combination of different sensors (e.g., high-spatial but low spectral resolution vs. low-spatial but high spectral, optical vs. SAR). Given the respective strengths and weaknesses of the different types of image data, it is beneficial to fuse many types of image data to extract as much information as possible from the data. Our work focuses on the fusion of multi-sensor image data into a unified representation that incorporates the potential strengths of a sensor in order to minimize classification error. Of particular interest is the fusion of optical and synthetic aperture radar (SAR) images into a single, multispectral image of the best possible spatial resolution. We explore various methods to optimally fuse these images and evaluate the quality of the image fusion by using K-means clustering to categorize regions in the fused images and comparing the accuracies of the resulting categorization maps.

Martin, Benjamin W [ORNL] [ORNL; Vatsavai, Raju [ORNL] [ORNL

2013-01-01T23:59:59.000Z

446

Ammonia and ammonium hydroxide sensors for ammonia/water absorption machines: Literature review and data compilation  

SciTech Connect (OSTI)

This report describes an evaluation of various sensing techniques for determining the ammonia concentration in the working fluid of ammonia/water absorption cycle systems. The purpose of this work was to determine if any existing sensor technology or instrumentation could provide an accurate, reliable, and cost-effective continuous measure of ammonia concentration in water. The resulting information will be used for design optimization and cycle control in an ammonia-absorption heat pump. PNL researchers evaluated each sensing technology against a set of general requirements characterizing the potential operating conditions within the absorption cycle. The criteria included the physical constraints for in situ operation, sensor characteristics, and sensor application. PNL performed an extensive literature search, which uncovered several promising sensing technologies that might be applicable to this problem. Sixty-two references were investigated, and 33 commercial vendors were identified as having ammonia sensors. The technologies for ammonia sensing are acoustic wave, refractive index, electrode, thermal, ion-selective field-effect transistor (ISFET), electrical conductivity, pH/colormetric, and optical absorption. Based on information acquired in the literature search, PNL recommends that follow-on activities focus on ISFET devices and a fiber optic evanescent sensor with a colormetric indicator. The ISFET and fiber optic evanescent sensor are inherently microminiature and capable of in situ measurements. Further, both techniques have been demonstrated selective to the ammonium ion (NH{sub 4}{sup +}). The primary issue remaining is how to make the sensors sufficiently corrosion-resistant to be useful in practice.

Anheier, N.C. Jr.; McDonald, C.E.; Cuta, J.M.; Cuta, F.M.; Olsen, K.B.

1995-05-01T23:59:59.000Z

447

Synthesis of Metal Oxide Nanomaterials for Chemical Sensors by Molecular Beam Epitaxy  

SciTech Connect (OSTI)

Since the industrial revolution, detection and monitoring of toxic matter, chemical wastes, and air pollutants has become an important environmental issue. Thus, it leads to the development of chemical sensors for various environmental applications. The recent disastrous oil spills over the near-surface of ocean due to the offshore drilling emphasize the use of chemical sensors for prevention and monitoring of the processes that might lead to these mishaps.1, 2 Chemical sensors operated on a simple principle that the sensing platform undergoes a detectable change when exposed to the target substance to be sensed. Among all the types of chemical sensors, solid state gas sensors have attracted a great deal of attention due to their advantages such as high sensitivity, greater selectivity, portability, high stability and low cost.3, 4 Especially, semiconducting metal oxides such as SnO2, TiO2, and WO3 have been widely used as the active sensing platforms in solid state gas sensors.5 For the enhanced properties of solid state gas sensors, finding new sensing materials or development of existing materials will be needed. Thus, nanostructured materials such as nanotubes,6-8 nanowires,9-11 nanorods,12-15 nanobelts,16, 17 and nano-scale thin films18-23 have been synthesized and studied for chemical sensing applications.

Nandasiri, Manjula I.; Kuchibhatla, Satyanarayana V N T; Thevuthasan, Suntharampillai

2013-12-01T23:59:59.000Z

448

Optical high acidity sensor  

DOE Patents [OSTI]

An apparatus and method for determining acid concentrations in solutions having acid concentrations of from about 0.1 Molar to about 16 Molar is disclosed. The apparatus includes a chamber for interrogation of the sample solution, a fiber optic light source for passing light transversely through the chamber, a fiber optic collector for receiving the collimated light after transmission through the chamber, a coating of an acid resistant polymeric composition upon at least one fiber end or lens, the polymeric composition in contact with the sample solution within the chamber and having a detectable response to acid concentrations within the range of from about 0.1 Molar to about 16 Molar, a measurer for the response of the polymeric composition in contact with the sample solution, and, a comparer of the measured response to predetermined standards whereby the acid molarity of the sample solution within the chamber can be determined. Preferably, a first lens is attached to the end of the fiber optic light source, the first lens adapted to collimate light from the fiber optic light source, and a second lens is attached to the end of the fiber optic collector for focusing the collimated light after transmission through the chamber.

Jorgensen, Betty S. (Jemez Springs, NM); Nekimken, Howard L. (Los Alamos, NM); Carey, W. Patrick (Lynnwood, WA); O'Rourke, Patrick E. (Martinez, GA)

1997-01-01T23:59:59.000Z

449

ION 2006, Fort Worth TX, 26-29 September 2006 1 GPS/INS/G Sensors/Yaw Rate Sensor/Wheel  

E-Print Network [OSTI]

of four integration strategies, namely a GPS/INS integrated system, a GPS/INS/G sensors/Yaw rate sensor/Wheel speed sensor system with two non- holonomic constraints, a GPS/INS/G sensors/Yaw rate sensor/Wheel speed/INS/G sensors/Yaw rate sensor/Wheel speed sensor system with the removal of the lateral constraint

Calgary, University of

450

Development of Radiation Hard Sensors  

E-Print Network [OSTI]

The trackers of the present LHC experiments mainly use silicon pixel detectors in the innermost regions close to the interaction point, while silicon micro-strip detectors are used at larger radii. The next phases of the LHC will present new challenges for the operation of the tracking detectors in terms of radiation levels and data rates. For ATLAS, CMS and LHCb radiation levels will amount to levels of the order of hundreds of Mrad and 10^16 NIEL (1 MeV neutron equivalent per cm^2) in the innermost layers. Higher granularity and a reduction in material budget especially for the layers close to the IP are under development to further improve the impact parameter resolution. The choice of sensors for the trackers will be driven by the need to meet these requirements. A short overview on the status of the R&D on silicon sensors suitable for this challenging environment will be given, covering the presently used but also newly emerging technologies such as CMOS based silicon sensors. The capabilities of tec...

Riedler, P; The ATLAS collaboration

2013-01-01T23:59:59.000Z

451

Method and apparatus of assessing down-hole drilling conditions  

DOE Patents [OSTI]

A method and apparatus for use in assessing down-hole drilling conditions are disclosed. The apparatus includes a drill string, a plurality of sensors, a computing device, and a down-hole network. The sensors are distributed along the length of the drill string and are capable of sensing localized down-hole conditions while drilling. The computing device is coupled to at least one sensor of the plurality of sensors. The data is transmitted from the sensors to the computing device over the down-hole network. The computing device analyzes data output by the sensors and representative of the sensed localized conditions to assess the down-hole drilling conditions. The method includes sensing localized drilling conditions at a plurality of points distributed along the length of a drill string during drilling operations; transmitting data representative of the sensed localized conditions to a predetermined location; and analyzing the transmitted data to assess the down-hole drilling conditions.

Hall, David R. (Provo, UT); Pixton, David S. (Lehl, UT); Johnson, Monte L. (Orem, UT); Bartholomew, David B. (Springville, UT); Fox, Joe (Spanish Fork, UT)

2007-04-24T23:59:59.000Z

452

Electrochemical noise sensors for detection of localized and general corrosion of natural gas transmission pipelines  

SciTech Connect (OSTI)

The U.S. Department of Energy, National Energy Technology Laboratory funded a Natural Gas Infrastructure Reliability program directed at increasing and enhancing research and development activities in topics such as remote leak detection, pipe inspection, and repair technologies and materials. The Albany Research Center (ARC), U.S. Department of Energy was funded to study the use of electrochemical noise sensors for detection of localized and general corrosion of natural gas transmission pipelines. As part of this, ARC entered into a collaborative effort with the corrosion sensor industry to demonstrate the capabilities of commercially available remote corrosion sensors for use with the Nation's Gas Transmission Pipeline Infrastructure needs. The goal of the research was to develop an emerging corrosion sensor technology into a monitor for the type and degree of corrosion occurring at key locations in gas transmission pipelines.

Holcomb, Gordon R.; Bullard, Sophie J.; Covino, Bernard S., Jr.; Cramer, Stephen D.; Russell, James H.; Ziomek-Moroz, Margaret

2002-09-01T23:59:59.000Z

453

Method for detecting toxic gases  

DOE Patents [OSTI]

A method is disclosed which is capable of detecting low concentrations of a pollutant or other component in air or other gas. This method utilizes a combination of a heating filament having a catalytic surface of a noble metal for exposure to the gas and producing a derivative chemical product from the component. An electrochemical sensor responds to the derivative chemical product for providing a signal indicative of the product. At concentrations in the order of about 1-100 ppm of tetrachloroethylene, neither the heating filament nor the electrochemical sensor is individually capable of sensing the pollutant. In the combination, the heating filament converts the benzyl chloride to one or more derivative chemical products which may be detected by the electrochemical sensor. 6 figures.

Stetter, J.R.; Zaromb, S.; Findlay, M.W. Jr.

1991-10-08T23:59:59.000Z

454

A simulation model for the lifetime of wireless sensor networks  

E-Print Network [OSTI]

In this paper we present a model for the lifetime of wireless sensor networks. The model takes into consideration several parameters such as the total number of sensors, network size, percentage of sink nodes, location of sensors, the mobility of sensors, and power consumption. A definition of the life time of the network based on three different criteria is introduced; percentage of available power to total power, percentage of alive sensors to total sensors, and percentage of alive sink sensors to total sink sensors. A Matlab based simulator is developed for the introduced model. A number of wireless sensor networks scenarios are presented and discussed.

Elleithy, Abdelrahman

2012-01-01T23:59:59.000Z

455

Imaging sunspots using helioseismic methods  

Science Journals Connector (OSTI)

...poorly understood areas in solar physics. Imaging local anomalous...sunspots and the surrounding solar active regions. By highlighting...Interpretation, Computer-Assisted methods Oscillometry methods Rheology methods Solar Activity Solar System Vibration

2005-01-01T23:59:59.000Z

456

Thin Silicon MEMS Contact-Stress Sensor  

SciTech Connect (OSTI)

This thin, MEMS contact-stress (CS) sensor continuously and accurately measures time-varying, solid interface loads in embedded systems over tens of thousands of load cycles. Unlike all other interface load sensors, the CS sensor is extremely thin (< 150 {micro}m), provides accurate, high-speed measurements, and exhibits good stability over time with no loss of calibration with load cycling. The silicon CS sensor, 5 mm{sup 2} and 65 {micro}m thick, has piezoresistive traces doped within a load-sensitive diaphragm. The novel package utilizes several layers of flexible polyimide to mechanically and electrically isolate the sensor from the environment, transmit normal applied loads to the diaphragm, and maintain uniform thickness. The CS sensors have a highly linear output in the load range tested (0-2.4 MPa) with an average accuracy of {+-} 1.5%.

Kotovsky, J; Tooker, A; Horsley, D

2010-03-22T23:59:59.000Z

457

Frustrated total internal reflection acoustic field sensor  

DOE Patents [OSTI]

A frustrated total internal reflection acoustic field sensor which allows the acquisition of the acoustic field over an entire plane, all at once. The sensor finds use in acoustic holography and acoustic diffraction tomography. For example, the sensor may be produced by a transparent plate with transparent support members tall enough to support one or more flexible membranes at an appropriate height for frustrated total internal reflection to occur. An acoustic wave causes the membrane to deflect away from its quiescent position and thus changes the amount of light that tunnels through the gap formed by the support members and into the membrane, and so changes the amount of light reflected by the membrane. The sensor(s) is illuminated by a uniform tight field, and the reflection from the sensor yields acoustic wave amplitude and phase information which can be picked up electronically or otherwise.

Kallman, Jeffrey S. (Pleasanton, CA)

2000-01-01T23:59:59.000Z

458

Estimating Methods  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

Based on the project's scope, the purpose of the estimate, and the availability of estimating resources, the estimator can choose one or a combination of techniques when estimating an activity or project. Estimating methods, estimating indirect and direct costs, and other estimating considerations are discussed in this chapter.

1997-03-28T23:59:59.000Z

459

Power spectral density estimation for wireless fluctuation enhanced gas sensor nodes  

E-Print Network [OSTI]

Fluctuation enhanced sensing (FES) is a promising method to improve the selectivity and sensitivity of semiconductor and nanotechnology gas sensors. Most measurement setups include high cost signal conditioning and data acquisition units as well as intensive data processing. However, there are attempts to reduce the cost and energy consumption of the hardware and to find efficient processing methods for low cost wireless solutions. In our paper we propose highly efficient signal processing methods to analyze the power spectral density of fluctuations. These support the development of ultra-low-power intelligent fluctuation enhanced wireless sensor nodes while several further applications are also possible.

Mingesz, Robert; Gingl, Zoltan

2014-01-01T23:59:59.000Z

460

E-Print Network 3.0 - activity indicator model Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

on the GUI. The pur- pose of this work is to explore how... observation streams from sensors, activities can be ... Source: Modayil, Joseph - Department of Computing Science,...

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While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Query Processing in Mobile Sensor Networks Wang-Chien Lee  

E-Print Network [OSTI]

, a sensor network for air pollution test, where all sensors are scattered in the air and transported to collect the data from the sensors about air pollution and traffic conditions. In comparison, vehicles, animals, air, and water). With self-propelling sensor nodes, a mobile sensor network is self

Giles, C. Lee

462

Mobile Sensor Networks: System Hardware and Dispatch Software  

Science Journals Connector (OSTI)

Wireless sensor networks (WSNs) provide a convenient way to monitor the physical environment. They consist of a large number of sensors that have sensing, computing, and communication abilities. In the past, sensors were considered as static, but the ... Keywords: Dispatch algorithms, mobility management, path planning, sensor hardware, wireless sensor and actuator network

You-Chiun Wang

2014-06-01T23:59:59.000Z

463

Sensors 2007, 7, 3428-3441 ISSN 1424-8220  

E-Print Network [OSTI]

Sensors 2007, 7, 3428-3441 sensors ISSN 1424-8220 © 2007 by MDPI www.mdpi.org/sensors Full Research-of-view Sensor (SeaWiFS, 7 bands), the Moderate-Resolution Imaging Spectrometer (MODIS, 8 bands), and the Medium sensors. Recently, Lee and Carder (2002) demonstrated that for adequate derivation of major properties

Lee, Zhongping

464

TCPL: A Defense against wormhole attacks in wireless sensor networks  

SciTech Connect (OSTI)

Do In this paper presents recent advances in technology have made low-cost, low-power wireless sensors with efficient energy consumption. A network of such nodes can coordinate among themselves for distributed sensing and processing of certain data. For which, we propose an architecture to provide a stateless solution in sensor networks for efficient routing in wireless sensor networks. This type of architecture is known as Tree Cast. We propose a unique method of address allocation, building up multiple disjoint trees which are geographically inter-twined and rooted at the data sink. Using these trees, routing messages to and from the sink node without maintaining any routing state in the sensor nodes is possible. In this paper, we introduce the wormhole attack, a severe attack in ad hoc networks that is particularly challenging to defend against. The wormhole attack is possible even if the attacker has not compromised any hosts and even if all communication provides authenticity and confidentiality. In the wormhole attack, an attacker records packets (or bits) at one location in the network, tunnels them to another location, and retransmits them there into the network. The wormhole attack can form a serious threat in wireless networks, especially against many sensor network routing protocols and location-based wireless security systems. For example, most existing ad hoc network routing protocols, without some mechanism to defend against the wormhole attack, would be unable to find routes longer than one or two hops, severely disrupting communication. We present a new, general mechanism, called packet leashes, for detecting and thus defending against wormhole attacks, and we present a specific protocol, called TIK, that implements leashes.

Kumar, K. E. Naresh [PG Student, Dept of Computer Science and Engineering, KBNCE, Gulbarga, Karnataka (India); Waheed, Mohd. Abdul [Asst. Professor, Dept of Computer Science and Engineering, KBNCE, Gulbarga, Karnataka (India); Basappa, K. Kari [Professor, Dept of E and CE, Dayanand College of Engineering, Banglore, Karnataka (India)

2010-10-26T23:59:59.000Z

465

Low-Cost Fiber Optic Pressure Sensor  

DOE Patents [OSTI]

The size and cost of fabricating fiber optic pressure sensors is reduced by fabricating the membrane of the sensor in a non-planar shape. The design of the sensors may be made in such a way that the non-planar membrane becomes a part of an air-tight cavity, so as to make the membrane resilient due to the air-cushion effect of the air-tight cavity. Such non-planar membranes are easier to make and attach.

Sheem, Sang K. (Pleasanton, CA)

2003-07-22T23:59:59.000Z

466

Low-Cost Fiber Optic Pressure Sensor  

DOE Patents [OSTI]

The size and cost of fabricating fiber optic pressure sensors is reduced by fabricating the membrane of the sensor in a non-planar shape. The design of the sensors may be made in such a way that the non-planar membrane becomes a part of an air-tight cavity, so as to make the membrane resilient due to the air-cushion effect of the air-tight cavity. Such non-planar membranes are easier to make and attach.

Sheem, Sang K. (Pleasanton, CA)

2004-05-18T23:59:59.000Z

467

HYDROCARBON AND SULFUR SENSORS FOR SOFC SYSTEMS  

SciTech Connect (OSTI)

The following report summarizes work conducted during the Phase I program Hydrocarbon and Sulfur Sensors for SOFC Systems under contract No. DE-FC26-02NT41576. For the SOFC application, sensors are required to monitor hydrocarbons and sulfur in order to increase the operation life of SOFC components. This report discusses the development of two such sensors, one based on thick film approach for sulfur monitoring and the second galvanic based for hydrocarbon monitoring.

A.M. Azad; Chris Holt; Todd Lesousky; Scott Swartz

2003-11-01T23:59:59.000Z

468

Sensor Development for PEM Fuel Cell Systems  

SciTech Connect (OSTI)

This document reports on the work done by Honeywell Sensing and Control to investigate the feasibility of modifying low cost Commercial Sensors for use inside a PEM Fuel Cell environment. Both stationary and automotive systems were considered. The target environment is hotter (100 C) than the typical commercial sensor maximum of 70 C. It is also far more humid (100% RH condensing) than the more typical 95% RH non-condensing at 40 C (4% RH maximum at 100 C). The work focused on four types of sensors, Temperature, Pressure, Air Flow and Relative Humidity. Initial design goals were established using a market research technique called Market Driven Product Definition (MDPD). A series of interviews were conducted with various users and system designers in their facilities. The interviewing team was trained in data taking and analysis per the MDPD process. The final result was a prioritized and weighted list of both requirements and desires for each sensor. Work proceeded on concept development for the 4 types of sensors. At the same time, users were developing the actual fuel cell systems and gaining knowledge and experience in the use of sensors and controls systems. This resulted in changes to requirements and desires that were not anticipated during the MDPD process. The concepts developed met all the predicted requirements. At the completion of concept development for the Pressure Sensor, it was determined that the Fuel Cell developers were happy with off-the-shelf automotive pressure sensors. Thus, there was no incentive to bring a new Fuel Cell Specific Pressure Sensor into production. Work was therefore suspended. After the experience with the Pressure Sensor, the requirements for a Temperature Sensor were reviewed and a similar situation applied. Commercially available temperature sensors were adequate and cost effective and so the program was not continued from the Concept into the Design Phase.

Steve Magee; Richard Gehman

2005-07-12T23:59:59.000Z

469

REMOTE DETECTION OF INTERNAL PIPELINE CORROSION USING FLUIDIZED SENSORS  

SciTech Connect (OSTI)

Pipelines present a unique challenge to monitoring because of the great geographical distances they cover, their burial depth, their age, and the need to keep the product flowing without much interruption. Most other engineering structures that require monitoring do not pose such combined challenges. In this regard, a pipeline system can be considered analogous to the blood vessels in the human body. The human body has an extensive ''pipeline'' through which blood and other fluids are transported. The brain can generally sense damage to the system at any location and alert the body to provide temporary repair, unless the damage is severe. This is accomplished through a vast network of fixed and floating sensors combined with a vast and extremely complex communication/decision making system. The project described in this report mimics the distributed sensor system of our body, albeit in a much more rudimentary fashion. Internal corrosion is an important factor in pipeline integrity management. At present, the methods to assess internal corrosion in pipelines all have certain limitations. In-line inspection tools are costly and cannot be used in all pipelines. Because there is a significant time interval between inspections, any impact due to upsets in pipeline operations can be missed. Internal Corrosion Direct Assessment (ICDA) is a procedure that can be used to identify locations of possible internal corrosion. However, the uncertainties in the procedure require excavation and location of damage using more detailed inspection tools. Non-intrusive monitoring techniques can be used to monitor internal corrosion, but these tools also require pipeline excavation and are limited in the spatial extent of corrosion they can examine. Therefore, a floating sensor system that can deposit at locations of water accumulation and communicate the corrosion information to an external location is needed. To accomplish this, the project is divided into four main tasks related to wireless data transmission, corrosion sensor development, sensor system motion and delivery, and consideration of other pipeline operations issues. In the first year of the program, focus was on sensor development and wireless data transmission. The second year of the program, which was discontinued due to funding shortfall, would have focused on further wireless transmission development, packaging of sensor on wireless, and other operational issues. Because, the second year funding has been discontinued, recommendations are made for future studies.

Narasi Sridhar; Garth Tormoen; Ashok Sabata

2005-10-31T23:59:59.000Z

470

Advanced Sensors and Instrumentation | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Sensors and Instrumentation Sensors and Instrumentation Advanced Sensors and Instrumentation The ASI subprogram plans to develop the scientific basis for sensors and supporting infrastructure technology that will address crosscutting technology gaps relating to measurements at existing and advanced nuclear power plants as well as within their fuel cycles. The focus of the program is on the following technical challenges and objectives: Identify needed physical measurement accuracy of nuclear system process parameters and minimize uncertainty. Identify and conduct research into monitoring and control technologies, including human factors, to achieve control of new nuclear energy processes, and new methodologies for monitoring to achieve high reliability and availability. Integrate control of multiple processes, potential reductions in

471

Particle Sensor for Diesel Combustion Monitoring | Department...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Particulate Matter Sensor for HCCI and Conventional Diesel Engines High-Energy, Pulsed-Laser Diagnostics for Real-Time Measurements of Reciprocating Engine PM Emissions...

472

Sensors, Controls, and Transactive Energy Research | Department...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Energy Research Sensors, Controls, and Transactive Energy Research Lead Performer: Oak Ridge National Laboratory - Oak Ridge, TN DOE Funding: 2,700,000 Cost Share: NA...

473

Crosscutting Research Sensors and Controls Project Portfolio  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

in innovative sensor and control technology, advanced materials, revolutionary modeling and simulation tools, and university training and research that promote the...

474

Robust Semidefinite Programming Approaches for Sensor Network ...  

E-Print Network [OSTI]

May 21, 2006 ... Sample random problem with 20 sensors, 12 anchors . ... Section 2 with background and notation, including information on the linear...

2006-05-21T23:59:59.000Z

475

Planar Hall effect bridge magnetic field sensors  

SciTech Connect (OSTI)

Until now, the planar Hall effect has been studied in samples with cross-shaped Hall geometry. We demonstrate theoretically and experimentally that the planar Hall effect can be observed for an exchange-biased ferromagnetic material in a Wheatstone bridge topology and that the sensor signal can be significantly enhanced by a geometric factor. For the samples in the present study, we demonstrate an enhancement of the sensor output by a factor of about 100 compared to cross-shaped sensors. The presented construction opens a new design and application area of the planar Hall effect, which we term planar Hall effect bridge sensors.

Henriksen, A. D.; Dalslet, B. T.; Skieller, D. H.; Lee, K. H.; Okkels, F.; Hansen, M. F. [Department of Micro- and Nanotechnology, DTU Nanotech, Technical University of Denmark, Building 345 East, DK-2800 Kongens Lyngby (Denmark)

2010-07-05T23:59:59.000Z

476

Chemical preconcentrator with integral thermal flow sensor  

DOE Patents [OSTI]

A chemical preconcentrator with integral thermal flow sensor can be used to accurately measure fluid flow rate in a microanalytical system. The thermal flow sensor can be operated in either constant temperature or constant power mode and variants thereof. The chemical preconcentrator with integral thermal flow sensor can be fabricated with the same MEMS technology as the rest of the microanlaytical system. Because of its low heat capacity, low-loss, and small size, the chemical preconcentrator with integral thermal flow sensor is fast and efficient enough to be used in battery-powered, portable microanalytical systems.

Manginell, Ronald P. (Albuquerque, NM); Frye-Mason, Gregory C. (Cedar Crest, NM)

2003-01-01T23:59:59.000Z

477

Planar Total Internal Reflection Biofouling Sensors  

E-Print Network [OSTI]

Cladding Input Edge Diffraction Critical Point Core LaserCladding Core Input Edge Diffraction Surface Plasmon Resonance Metal Layer Prism-coupler (Sensor) Laser

Nam, Koo Hyun

2010-01-01T23:59:59.000Z

478

MB3a Infrasound Sensor Evaluation.  

SciTech Connect (OSTI)

Sandia National Laboratories has tested and evaluated a new infrasound sensor, the MB3a, manufactured by Seismo Wave. These infrasound sensors measure pressure output by a methodology developed by researchers at the French Alternative Energies and Atomic Energy Commission (CEA) and the technology was recently licensed to Seismo Wave for production and sales. The purpose of the infrasound sensor evaluation was to determine a measured sensitivity, transfer function, power, self-noise, dynamic range, seismic sensitivity, and self- calibration ability. The MB3a infrasound sensors are being evaluated for potential use in the International Monitoring System (IMS) of the Comprehensive Nuclear Test-Ban-Treaty Organization (CTBTO).

Merchant, Bion J.; McDowell, Kyle D.

2014-11-01T23:59:59.000Z

479

Wireless Sensors Improve Data Center Efficiency  

Broader source: Energy.gov [DOE]

Case study bulletin describes how to improve data center energy efficiency for wireless sensors, and how to use that information to manage the data center.

480

Uncertainty Quantification Techniques for Sensor Calibration...  

Office of Scientific and Technical Information (OSTI)

Uncertainty Quantification Techniques for Sensor Calibration Monitoring in Nuclear Power Plants Re-direct Destination: Temp Data Fields Ramuhalli, Pradeep; Lin, Guang; Crawford,...

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


481

Advanced Sensors, Control, Platforms, and Modeling  

Office of Environmental Management (EM)

112 productivity and safety, and boost the U.S. sensor and automation industry. 113 2. Technology Assessment and Potential 114 2.1 Performance advances 115 DRAFT -...

482

Sensors and Actuators B 107 (2005) 121125 Two photon fluorescence sensors based on resonant grating  

E-Print Network [OSTI]

Sensors and Actuators B 107 (2005) 121­125 Two photon fluorescence sensors based on resonant the excitation and emission radia- tion reduces the background noise, the static photobleaching.07.040 #12;122 T. Katchalski et al. / Sensors and Actuators B 107 (2005) 121­125 lar, they are compact

Friesem, Asher A.

483

Sensors and Actuators B 118 (2006) 135141 Low temperature indium oxide gas sensors  

E-Print Network [OSTI]

Sensors and Actuators B 118 (2006) 135­141 Low temperature indium oxide gas sensors M. Sucheaa rights reserved. Keywords: Metal oxide thin films; InOx; Gas sensors; Ozone 1. Introduction The interest's attractive for many areas such as transparent electrodes for solar cells and flat panel displays

484

A Probability Extension of PCA to Detect and Diagnose Sensor Faults in Air Handling Units  

E-Print Network [OSTI]

Due to sensor faults, it is a challenge to successfully detect and diagnose component faults in HVAC systems. The Principal Component Analysis (PCA) method has become a popular method to tackle this problem in recent years, but PCA is not capable...

Li, Z.

2011-01-01T23:59:59.000Z

485

Wireless Sensors for Data Centers  

Broader source: Energy.gov (indexed) [DOE]

Proving Ground Proving Ground Wireless Sensors for Data Centers Kevin Powell |May 23 2012 | FEMP Technology Deployment Working Group 9,624 Owned and Leased Assets 30% Metered Energy Reduction, by 2015 NET ZERO In New Construction and Major Remodels, by 2030 EISA 2007 GSA's Green Proving Ground The Green Proving Ground aims to leverage innovative technologies to accelerate GSA's sustainability goals. Program Focus: Identify, test and evaluate innovative technologies to: * Drive innovation in environmental performance in federal buildings * Help lead market transformation through deployment of new technologies. * Reduce GSA operational costs How Does It Work? Green Proving Ground

486

Capacitively-coupled inductive sensor  

DOE Patents [OSTI]

A capacitively coupled inductive shunt current sensor which utilizes capacitive coupling between flanges having an annular inductive channel formed therein. A voltage dividing capacitor is connected between the coupling capacitor and ground to provide immediate capacitive division of the output signal so as to provide a high frequency response of the current pulse to be detected. The present invention can be used in any desired outer conductor such as the outer conductor of a coaxial transmission line, the outer conductor of an electron beam transmission line, etc.

Ekdahl, Carl A. (Albuquerque, NM)

1984-01-01T23:59:59.000Z

487

Wireless Sensors for Data Centers  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Proving Ground Proving Ground Wireless Sensors for Data Centers Kevin Powell |May 23 2012 | FEMP Technology Deployment Working Group 9,624 Owned and Leased Assets 30% Metered Energy Reduction, by 2015 NET ZERO In New Construction and Major Remodels, by 2030 EISA 2007 GSA's Green Proving Ground The Green Proving Ground aims to leverage innovative technologies to accelerate GSA's sustainability goals. Program Focus: Identify, test and evaluate innovative technologies to: * Drive innovation in environmental performance in federal buildings * Help lead market transformation through deployment of new technologies. * Reduce GSA operational costs How Does It Work? Green Proving Ground

488

Vision and Inertial Sensor Based Drive Trains Control  

E-Print Network [OSTI]

Inertial Sensor Based Drive Trains Control by Haifei Cheng AInertial Sensor Based Drive Trains Control c 2010 by HaifeiInertial Sensor Based Drive Trains Control by Haifei Cheng

Cheng, Haifei

2010-01-01T23:59:59.000Z

489

Sensor Fish Re-design to Support Advance Hydropower Development...  

Broader source: Energy.gov (indexed) [DOE]

Sensor Fish Re-design to Support Advance Hydropower Development Sensor Fish Re-design to Support Advance Hydropower Development Sensor Fish Re-design to Support Advance Hydropower...

490

Logging-while-coring method and apparatus  

DOE Patents [OSTI]

A method and apparatus for downhole coring while receiving logging-while-drilling tool data. The apparatus includes core collar and a retrievable core barrel. The retrievable core barrel receives core from a borehole which is sent to the surface for analysis via wireline and latching tool The core collar includes logging-while-drilling tools for the simultaneous measurement of formation properties during the core excavation process. Examples of logging-while-drilling tools include nuclear sensors, resistivity sensors, gamma ray sensors, and bit resistivity sensors. The disclosed method allows for precise core-log depth calibration and core orientation within a single borehole, and without at pipe trip, providing both time saving and unique scientific advantages.

Goldberg, David S. (New York, NY); Myers, Gregory J. (Cornwall, NY)

2007-11-13T23:59:59.000Z

491

IEEE SENSORS JOURNAL, SELECTED PAPER FROM IEEE SENSORS 2012 CONFERENCE SPECIAL ISSUE, JULY 2013 1 Ambient-RF-Energy-Harvesting Sensor Device with  

E-Print Network [OSTI]

, Wireless Sensor Networks I. INTRODUCTION Energy harvesting devices such as solar panels, piezoelectricIEEE SENSORS JOURNAL, SELECTED PAPER FROM IEEE SENSORS 2012 CONFERENCE SPECIAL ISSUE, JULY 2013 1 Ambient-RF-Energy-Harvesting Sensor Device with Capacitor-Leakage-Aware Duty Cycle Control Ryo Shigeta

Tentzeris, Manos

492

Prospects for Bandit Solutions in Sensor Management  

Science Journals Connector (OSTI)

......Bristol BS34 7QW, UK Handling editor: Nick Jennings Sensor management in information-rich...revised 1 December 2009 Handling editor: Nick Jennings 1. INTRODUCTION Sensor management...waspartiallysupportedbyaRoyalSociety Wolfson Research Merit Award. REFERENCES [1] Hero III,A......

Nicos G. Pavlidis; Niall M. Adams; David Nicholson; David J. Hand

2010-11-01T23:59:59.000Z

493

A Virtual Infrastructure for Wireless Sensor Networks  

E-Print Network [OSTI]

of microelectromechanical systems (MEMS), miniaturized low-power devices that integrate sensing, special-purpose computing, and wireless communications 107 Handbook of Sensor Networks: Algorithms and Architectures, Edited by I of their operating environ- ment (anonymity of individual sensors, limited energy budget, and a possibly hostile

Stojmenovic, Ivan

494

Photogrammetry & Machine Vision 1. Image sensors  

E-Print Network [OSTI]

Photogrammetry & Machine Vision 1. Image sensors (a) Fundamentals of image sensors (b) CCD image'Apuzzo Photogrammetry and Machine Vision - 3 Point cloud processing, surface generation, texturing (b) Camera, noise) 2N. D'Apuzzo Photogrammetry and Machine Vision - 3 Point cloud processing, surface generation

Giger, Christine

495

Photogrammetry & Machine Vision 1. Image sensors  

E-Print Network [OSTI]

Photogrammetry & Machine Vision 1. Image sensors (a) Fundamentals of image sensors (b) CCD image. Remondino, N. D'Apuzzo Photogrammetry and Machine Vision ­ 1. Measurement in images (b) Camera calibration of Photogrammetry and Machine Vision Fully understand: 1. Image based 3D and 4D measurement 2. Image based 3D

Giger, Christine

496

Macroscopic sensor networks: Application issues in healthcare  

Science Journals Connector (OSTI)

Motes (coin-sized sensors) have the potential to transform the way in which people live and work where computing occurs without human interaction so that data may be pre-processed and made available on demand. Motes may potentially transform the workplace ... Keywords: Wireless sensor networks, healthcare, motes

Elaine Lawrence; Karla Felix Navarro; Josep Riudavets; Marco Messina

2006-04-01T23:59:59.000Z

497

Modeling Spatially Correlated Data in Sensor Networks  

E-Print Network [OSTI]

Modeling Spatially Correlated Data in Sensor Networks APOORVA JINDAL and KONSTANTINOS PSOUNIS of spatially correlated sensor network data. The proposed model is Markovian in nature and can capture on the degree of spatial correlation in data, under real and synthetic traces. The real traces are obtained from

498

FUNDAMENTAL PERFORMANCE LIMITS OF WIRELESS SENSOR NETWORKS  

E-Print Network [OSTI]

on each of the sensors (e.g., solar energy sources), our analysis concludes that the maximum sustainable throughput in energy-constrained sensor networks scales worse than the capacity based on interference among. In this case, when the number of nodes is sufficiently high, the energy-constrained network capacity dominates

Li, Baochun

499

DFIG Soft-Sensor and its Applications  

Science Journals Connector (OSTI)

The rotor speed measurement of doubly fed induction generator (DFIG) is very important to its control system design, but many problems may arise when applying traditional speed sensor. So, it is necessary to study the speed-sensorless measuring technique. ... Keywords: electrical power systems, DFIG, measuring, soft-sensor, speed observer

Kaifeng Zhang; Miao Xu; Li Sun; Haiming Zhou

2012-12-01T23:59:59.000Z

500

Ultra-wideband radar sensors and networks  

DOE Patents [OSTI]

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

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

2013-08-06T23:59:59.000Z