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1

30 CFR 77.902 - Low- and medium-voltage ground check monitor circuits.  

... 2014-07-01 false Low- and medium-voltage ground check monitor circuits...OF UNDERGROUND COAL MINES Low- and Medium-Voltage Alternating Current Circuits § 77.902 Low- and medium-voltage ground check monitor...

2014-07-01

2

30 CFR 75.902 - Low- and medium-voltage ground check monitor circuits.  

... 2014-07-01 false Low- and medium-voltage ground check monitor circuits...STANDARDS-UNDERGROUND COAL MINES Underground Low- and Medium-Voltage Alternating Current Circuits § 75.902 Low- and medium-voltage ground check monitor...

2014-07-01

3

Ride-through of Medium Voltage Synchronous Machine compressor drives  

Microsoft Academic Search

Medium voltage (MV) synchronous machines (SMs) are used for large industrial compressor motor drives (>15 MW). Energy savings, process and other benefits can often be achieved with adjustable speed drives (ASDs). Process availability is of primary concern since production losses can potentially negate the benefits of ASDs. It is essential to ensure that SMs ride through ASD and system faults,

F. Endrejat; P. Pillay

2009-01-01

4

A study on medium voltage power conversion system for plasma torch  

Microsoft Academic Search

This paper investigates the medium voltage power conversion system for plasma torch application. The plasma torch rated for 3MW, 2kA and having the physical size of 1 m long is selected. The dynamic characteristics of the DC arc in plasma torch are investigated using advanced 3D magneto-hydrodynamics simulation. The parameters of Cassie-Mayr arc model are calculated based on 3D simulation.

Yongsug Suh; Yongjoong Lee; J. Kheir; P. Steimer

2008-01-01

5

Control of a hybrid asymmetric multilevel inverter for competitive medium-voltage industrial drives  

Microsoft Academic Search

In symmetric multilevel inverters, there is a tradeoff between the output quality and the reliability and efficiency of the converter. New asymmetric and hybrid solutions, using different voltages and devices in various parts of the inverter, promise significant improvements for medium-voltage industrial drives. This paper investigates such a hybrid asymmetric nine-level inverter. It consists of a three-phase three-level integrated gate-commutated

Martin Veenstra; Alfred Rufer

2005-01-01

6

A medium voltage power supply with enhanced ignition characteristics for plasma torch in waste disposal system  

Microsoft Academic Search

This paper investigates a power supply of medium voltage with enhanced ignition characteristics for plasma torch in waste disposal system. Series resonant half-bridge topology is presented to be a suitable ignition circuitry. The ignition circuitry is integrated into the main power conversion system of a multi-phase staggered three-level dc-dc converter with a diode front-end rectifier. The plasma torch rated for

Yongsug Suh; Kyungsub Jung

2010-01-01

7

30 CFR 77.901 - Protection of low- and medium-voltage three-phase circuits.  

...2014-07-01 false Protection of low- and medium-voltage three-phase circuits. 77...OF UNDERGROUND COAL MINES Low- and Medium-Voltage Alternating Current Circuits § 77.901 Protection of low- and medium-voltage three-phase circuits....

2014-07-01

8

30 CFR 75.907 - Design of trailing cables for medium-voltage circuits.  

... false Design of trailing cables for medium-voltage circuits. 75.907 Section...STANDARDS-UNDERGROUND COAL MINES Underground Low- and Medium-Voltage Alternating Current Circuits § 75.907 Design of trailing cables for medium-voltage circuits. [Statutory...

2014-07-01

9

Comparison of 2.3kV Medium-Voltage Multilevel Converters for Industrial Medium-Voltage Drives  

Microsoft Academic Search

This paper compares the expense of power semiconductors and passive components of a (2.3 kV, 2.4 MVA) two-level, three-level neutral-point-clamped, three-level flying-capacitor, four-level flying-capacitor, and five-level series-connected H-bridge voltage source converter on the basis of the state-of-the-art 6.5-, 3.3-, 2.5-, and 1.7-kV insulated gate bipolar transistors for industrial medium-voltage drives. The power semiconductor losses, the loss distribution, the installed switch

Dietmar Krug; Steffen Bernet; Seyed Saeed Fazel; Kamran Jalili; Mariusz Malinowski

2007-01-01

10

30 CFR 77.900 - Low- and medium-voltage circuits serving portable or mobile three-phase alternating current...  

... 2014-07-01 false Low- and medium-voltage circuits serving portable...OF UNDERGROUND COAL MINES Low- and Medium-Voltage Alternating Current Circuits § 77.900 Low- and medium-voltage circuits serving...

2014-07-01

11

30 CFR 75.900 - Low- and medium-voltage circuits serving three-phase alternating current equipment; circuit...  

... 2014-07-01 false Low- and medium-voltage circuits serving three-phase...STANDARDS-UNDERGROUND COAL MINES Underground Low- and Medium-Voltage Alternating Current Circuits § 75.900 Low- and medium-voltage circuits serving...

2014-07-01

12

Commercialization of Medium Voltage HTS Triax TM Cable Systems  

SciTech Connect

The original project scope that was established in 2007 aimed to install a 1,700 meter (1.1 mile) medium voltage HTS Triax{TM} cable system into the utility grid in New Orleans, LA. In 2010, however, the utility partner withdrew from the project, so the 1,700 meter cable installation was cancelled and the scope of work was reduced. The work then concentrated on the specific barriers to commercialization of HTS cable technology. The modified scope included long-length HTS cable design and testing, high voltage factory test development, optimized cooling system development, and HTS cable life-cycle analysis. In 2012, Southwire again analyzed the market for HTS cables and deemed the near term market acceptance to be low. The scope of work was further reduced to the completion of tasks already started and to testing of the existing HTS cable system in Columbus, OH. The work completed under the project included: • Long-length cable modeling and analysis • HTS wire evaluation and testing • Cable testing for AC losses • Optimized cooling system design • Life cycle testing of the HTS cable in Columbus, OH • Project management. The 200 meter long HTS Triax{TM} cable in Columbus, OH was incorporated into the project under the initial scope changes as a test bed for life cycle testing as well as the site for an optimized HTS cable cooling system. The Columbus cable utilizes the HTS TriaxTM design, so it provided an economical tool for these of the project tasks.

Knoll, David

2012-12-31

13

A Comparative Study of Medium-Voltage Power Converter Topologies for Plasma Torch Under Dynamic Operating Conditions  

Microsoft Academic Search

This paper compares several medium-voltage power conversion systems for plasma torch application. The thermal plasma torch rated for 3 MW, 2 kA with the physical size of 1 m long is selected. The dynamic characteristics of the dc arc in a plasma torch are investigated using advanced 3-D magnetohydrodynamics simulation. The arc voltage noise of plusmn10% due to the periodic

Yongsug Suh; Yongjoong Lee; Peter K. Steimer

2009-01-01

14

Analysis of asset health : an approach to monitoring and diagnostics for medium voltage circuit breakers  

E-print Network

The Medium Voltage Electric Industry is a very conservative and risk adverse sector that has undergone very little change in the past 30 years when compared to other technologically dependent activities; this reality is ...

Corona, Erick (Erick Gustavo)

2013-01-01

15

30 CFR 75.901 - Protection of low- and medium-voltage three-phase circuits used underground.  

...2014-07-01 false Protection of low- and medium-voltage three-phase circuits used...STANDARDS-UNDERGROUND COAL MINES Underground Low- and Medium-Voltage Alternating Current Circuits § 75.901 Protection of low- and medium-voltage three-phase circuits...

2014-07-01

16

Large medium voltage drives — efficiency, energy savings and availability  

Microsoft Academic Search

An overview is given of conventional and modern large adjustable speed drive technologies (MW range). Overall efficiency is evaluated for different adjustable speed drive topologies, motor types, control methods and system configurations. Efficiency improvement opportunities are investigated. It is shown how modern technology can be applied safely with existing\\/standard petrochemical motors (identified for energy savings). Adjustable speed drives can contribute

Frieder Endrejat; Bruce van Blerk

2010-01-01

17

Comparison of switching devices in scalable switch concept for medium voltage medium frequency power conversion  

Microsoft Academic Search

This paper provides a comparison of switch concepts for medium frequency (MF) medium voltage (MV) applications in the lower power range (> 1 kHz). The comparison is based on measurements of actual discrete switches for hard-switched and ZVS forward topologies. It is shown that standard low power IGBTs in a scalable switch can be used to obtain the lowest losses

Jochen Mast; Guntram Scheible; Henry Gueldner

2001-01-01

18

Output sinus filter for medium voltage drive with direct torque control  

Microsoft Academic Search

For improving the motor voltage quality and for eliminating the high dv\\/dt associated problems like electromagnetic interference (EMI), additional motor losses, need of high-insulation class motors and overvoltages at motor terminals when long cables are used, this paper presents the design of an output sinus filter for medium voltage drive and the implementation of resonance compensator for active damping of

J. Pontt; J. Rodriguez; S. Kouro; C. Silva; H. Farias; M. Rotella

2005-01-01

19

Power losses evaluation of three multilevel converter topologies for direct interface with medium voltage grids  

Microsoft Academic Search

Acknowledgementsproject this report is based on was funded by E.ON as part of the E.ON International Research Initiative. Responsibility for the content of this publication lies with the author. Abstract paper presents the power losses evaluation and comparison of three different Mega Watt MW scale multilevel converter topologies proposed for interfacing energy storage systems to medium voltage grids using Medium

Mohamed Rashed; Christian Klumpner; Greg Asher

2011-01-01

20

An amorphous alloy core medium frequency magnetic-link for medium voltage photovoltaic inverters  

NASA Astrophysics Data System (ADS)

The advanced magnetic materials with high saturation flux density and low specific core loss have led to the development of an efficient, compact, and lightweight multiple-input multiple-output medium frequency magnetic-link. It offers a new route to eliminate some critical limitations of recently proposed medium voltage photovoltaic inverters. In this paper, a medium frequency magnetic-link is developed with Metglas amorphous alloy 2605S3A. The common magnetic-link generates isolated and balanced multiple DC supplies for all of the H-bridge inverter cells of the medium voltage inverter. The design and implementation of the prototype, test platform, and the experimental test results are analyzed and discussed. The medium frequency non-sinusoidal excitation electromagnetic characteristics of alloy 2605S3A are also compared with that of alloy 2605SA1. It is expected that the proposed new technology will have great potential for future renewable power generation systems and smart grid applications.

Rabiul Islam, Md.; Guo, Youguang; Wei Lin, Zhi; Zhu, Jianguo

2014-05-01

21

An optical device for an automated temporization of diagnostic tools for medium voltage substation  

NASA Astrophysics Data System (ADS)

This work describes a fibre optic device suitable for generating a trigger signal for a Medium Voltage substation monitoring system. It is based on the use of a low-cost transparent electro-optic ceramic for tracking electric field/voltage changes at the electric network frequency (50/60Hz). Results of tests carried out on a preliminary optical sensor, performed by means of a Voltage Calibrator, were in good agreement with the modelled sensor response to AC and DC voltages. This confirmed the effectiveness of the proposed model approach. Through simulation sensor parameters and layout were optimised for implementing a robust, low cost and easy installable optical device able to properly trigger a set of optical diagnostic tools for Medium Voltage switchboards.

De Maria, L.; Pistoni, N. C.; Bartalesi, D.

2013-05-01

22

Lightning protection of medium voltage overhead lines by modular long-flashover arresters  

Microsoft Academic Search

A long flashover arrester (LFA), which comprises three flashover modules using the creeping discharge effect, is described in this paper. In this design, the total arrester-stressing voltage is applied simultaneously to all of the modules so that the voltage-time characteristics of the arrester are improved considerably assuring reliable protection of medium voltage (e.g. 10 kV) overhead power lines against both

Georgij V. Podporkin; Vladimir E. Pilshikov; Alexander D. Sivaev

2003-01-01

23

Broadband Transmission via Underground Medium-Voltage Power Lines—Part I: Transmission Characteristics  

Microsoft Academic Search

The transmission characteristics of underground medium-voltage\\/broadband over power line (MV\\/BPL) channels are examined analytically. By appropriately modifying multiconductor transmission-line theory, the bottom-up approach, already used to treat overhead MV\\/BPL transmission, is extended to analyze BPL transmission in three-phase underground MV lines with common shield and armor. ThIS analysis shows that these cables may support five modes, giving rise to five

Athanasios G. Lazaropoulos; Panayiotis G. Cottis

2010-01-01

24

Multilevel Voltage-Source-Converter Topologies for Industrial Medium-Voltage Drives  

Microsoft Academic Search

This paper presents a technology review of voltage-source-converter topologies for industrial medium-voltage drives. In this highly active area, different converter topologies and circuits have found their application in the market. This paper covers the high-power voltage-source inverter and the most used multilevel-inverter topologies, including the neutral-point-clamped, cascaded H-bridge, and flying-capacitor converters. This paper presents the operating principle of each topology

JosÉ Rodriguez; Steffen Bernet; Bin Wu; Jorge O. Pontt; Samir Kouro

2007-01-01

25

Power Quality Solutions for Light Rail Public Transportation Systems Fed by Medium-Voltage Underground Cables  

Microsoft Academic Search

In this paper, the combination of a thyristor-switched shunt reactor and a current source converter-based active power filter has been proposed for mitigation of power quality (PQ) problems of Light Rail public Transportation Systems (LRTSs) fed by long medium-voltage underground cables. A case study has been carried out on a typical LRTS to assess the performance of the proposed solution

Alper Terciyanli; Adnan Acik; Alper Cetin; Muammer Ermis; I??k Cadirci; Cezmi Ermis; Turan Demirci; Haz?m Faruk Bilgin

2012-01-01

26

Control of a hybrid asymmetric multi-level inverter for competitive medium-voltage industrial drives  

Microsoft Academic Search

Hybrid asymmetric multi-level inverters promise significant improvements for medium-voltage industrial drives. Floating sub inverters without feeding can only supply reactive power. An on-line nonlinear model-predictive controller stabilizes their intermediate-circuit voltages in steady-state and during transients, as demonstrated by simulations and measurements. A pre-charge method assures converter start-up without additional equipment.

Martin Veenstra; Alfred Rufer

2003-01-01

27

Transmission Channel Model and Capacity of Overhead Multi-conductor Medium-Voltage Power-lines for Broadband Communications  

E-print Network

Transmission Channel Model and Capacity of Overhead Multi-conductor Medium-Voltage Power of Electrical Engineering, Center for Information & Communications Technology Research (CICTR) University Park with 70% of standard annealed copper conductivity. Originally designed for power delivery rather than

Kavehrad, Mohsen

28

Comparison of state-of-the-art voltage source converter topologies for medium voltage applications  

Microsoft Academic Search

This paper compares a two level voltage source converter (2L-VSC), a three-level neutral point clamped voltage source converter (3L-NPC VSC), a three-level flying capacitor voltage source converter (3L-FLC VSC) and a four-level flying capacitor voltage source converter (4L-FLC VSC) on the basis of state-of-the-art 6.5 kV, 3.3 kV and 2.5 kV IGBTs for a 2.3 kV medium voltage converter. The

Dietmar Krug; S. Bernet; S. Dieckerhoff

2003-01-01

29

NEMO medium voltage converter factory acceptance, operational and final integration tests  

NASA Astrophysics Data System (ADS)

The NEMO Collaboration, as part of the KM3NeT EU-funded consortium, is developing technical solutions for the construction of a cubic-kilometer scale neutrino telescope in the Mediterranean sea several kilometers below the sea level and far from the shore. In this framework, after years of design, development, assembly and testing the Alcatel deep sea medium voltage power converter (MVC) is ready for deployment at 100 km from the Capo Passero shore station. The MVC converts the 10 kV to an instrument-friendly 375 V for a 10 kW power. The MVC will be presented with focus on the factory acceptance, operational and final integration tests that recently have been carried out.

Cocimano, Rosanna; NEMO Collaboration

2011-01-01

30

Analysis of the efficacy of a WiFi architecture for the management of Medium Voltage distribution systems  

Microsoft Academic Search

The paper illustrates the interventions for improving security of a WiFi communication system applied in the automatic management of a Medium Voltage network. The management system fails if the data measured at the secondary substations can't flow regularly. In this paper the security of the transmission as function of the action range of the radio channel, on the data sending

Fabio Campoccia; M. L. Di Silvestre; E. R. Sanseverino; G. Zizzo

2010-01-01

31

Straight through cold-applied shrinkable EPDM cable joints designed for high stress medium voltage EPR cables  

Microsoft Academic Search

The introduction of high electrical stress EPR insulated medium voltage cables leads to the development of new cable joints suitable for installation. This paper presents the joint design considerations and test data. The test program is based on IEEE Standard 404-1993. Test samples include joints for high stress EPR cables and transition joints from high stress EPR cables to PILC

Y. Wen; A. Shocket; P. L. Cinquemani; U. Vallauri; G. Lencot

1998-01-01

32

Test of a 2 MVA medium voltage HTS fault current limiter module made of YBCO coated conductors  

Microsoft Academic Search

A fault current limiter module for medium voltage applications has been built and tested successfully. The module corresponds to one phase of a 3-phase limiter for the 13 kV-class distribution voltage level. The resistive type limiter consists of 15 bifilar coils wound from a total of 15 × 50 m of AMSC's 344S superconductors, a commercially available second generation YBCO

H-P Kraemer; W Schmidt; M Wohlfart; H-W Neumueller; A Otto; D Verebelyi; U Schoop; A P Malozemoff

2008-01-01

33

Calculation of pressure and temperature in medium-voltage electrical installations due to fault arcs  

NASA Astrophysics Data System (ADS)

In order to determine the pressure rise due to arc faults in electrical installations, the portion of energy heating the surrounding gas of fault arcs has to be known. The ratio of the portion of energy to the electric energy, the thermal transfer coefficient, is adopted as the kp factor. This paper presents a theoretical approach for the determination of the thermal transfer coefficient and the pressure rise in electrical installations. It is based on the fundamental hydro- and thermodynamic conservation equations and the equation of gas state taking into account melting and evaporation of metals as well as chemical reactions with the surrounding gas. In order to consider the dependence of the arc energy on the gas density, the radiative effect of fault arcs on the energy balance is introduced into the arc model by using the net emission coefficient as a function of gas density, arc temperature and arc radius. The results for a test container show that factors such as the kinds of insulating gases and of electrode materials, the size of test vessels and the gas density considerably influence the thermal transfer coefficient and thus the pressure rise. Furthermore, it is demonstrated, for an example of the arc fault in a compact medium-voltage station with pressure relief openings and a pressure relief channel, that the arc energy and the arc temperature can be simulated based on the changing gas density.

Zhang, X.; Zhang, J.; Gockenbach, E.

2008-05-01

34

Synthesis of Medium Voltage dc-to-dc Converters From Low-Voltage, High-Frequency PWM Switching Converters  

Microsoft Academic Search

Low-voltage dc-to-dc power conversion is a very mature industry which uses high-frequency pulsewidth modulation (PWM) switching techniques. The passive and active components needed to build low-voltage dc-to-dc converters are highly available, affordable and constantly improving. In this paper, a very simple and systematic method of using a large number of low-voltage, high-frequency PWM converters to synthesize highly redundant, medium voltage

Vatche Vorperian

2007-01-01

35

A high performance control technique of power electronic transformers in medium voltage grid-connected PV plants  

Microsoft Academic Search

With reference to medium-voltage grid-connection of large photovoltaic (PV) plants, the paper proposes and analyses a high performance solution based on a power electronic transformer (PET). It Includes dc-links and multilevel converters either in low-voltage or in high-voltage side, and a medium-frequency (MF) transformer. Together with the very reduced sizes of the whole conversion apparatus, an important feature of the

G. Brando; A. Dannier; A. Del Pizzo; R. Rizzo

2010-01-01

36

Solid-state circuit breakers and current limiters for medium-voltage systems having distributed power systems  

Microsoft Academic Search

State-of-the-art mechanical circuit breakers in medium-voltage systems allow a safe handling of short-circuits if the short circuit power of the grid is limited. Using delayed turn-off times, the circuit breakers can be coordinated with lower level protection gear. Hence, a high availability of the grid can be guaranteed. However, during a short-circuit a significant voltage sag can be noticed locally

Christoph Meyer; Stefan Schröder; Rik W. De Doncker

2004-01-01

37

Cabine primarie AT/MT dell'ENEL per l'alimentazione dei centri urbani. (ENEL high and medium voltage electrical substations for power supply to urban centers).  

National Technical Information Service (NTIS)

Modular high and medium voltage gas insulated electrical substations are being used by ENEL (Italian Electricity Board) to meet the specific needs of urban centers with special design and sizing constraints of a historical/architectural nature. This paper...

A. Bargigia, C. Boatto, A. Di Mario, N. Fava, S. Sciarra

1991-01-01

38

Analysis and Design of Power Electronic Transformer for Medium Voltage Levels  

Microsoft Academic Search

One key component of the future automation is replacement of conventional distribution transformers by an all-solid-state (power-electronic) alternative. In this paper, the optimum design of a power electronic transformer (PET) is investigated. In the design process, the PFC and DC-DC converters have been integrated to achieve higher efficiency. The proposed PET performs typical functions and has advantages such as power

H. Iman-Eini; S. Farhangi

2006-01-01

39

Medium Voltage–High Power Converter Topologies Comparison Procedure, for a 6.6 kV Drive Application Using 4.5 kV IGBT Modules  

Microsoft Academic Search

This paper presents a general comparison procedure for medium voltage - high power multilevel converter topologies and semiconductors, which is mainly based on analyzing the per- formance limits of the converters output characteristics such as the output voltage, current, active power, efficiency, etc. Afterwards, the general procedure is applied to compare some of the most relevant converter topologies oriented to

Alain Sanchez-Ruiz; Mikel Mazuela; Silverio Alvarez; Gonzalo Abad; Igor Baraia

2012-01-01

40

A Transformerless Hybrid Active Filter Capable of Complying with Harmonic Guidelines for Medium-Voltage Motor Drives  

NASA Astrophysics Data System (ADS)

This paper presents a transformerless hybrid active filter that is integrated into medium-voltage adjustable-speed motor drives for fans, pumps, and compressors without regenerative braking. The authors have designed and constructed a three-phase experimental system rated at 400V and 15kW, which is a downscaled model from a feasible 6.6-kV 1-MW motor drive system. This system consists of the hybrid filter connecting a passive filter tuned to the 7th harmonic filter in series with an active filter that is based on a three-level diode-clamped PWM converter, as well as an adjustable-speed motor drive in which a diode rectifier is used as the front end. The hybrid filter is installed on the ac side of the diode rectifier with no line-frequency transformer. The downscaled system has been exclusively tested so as to confirm the overall compensating performance of the hybrid filter and the filtering performance of a switching-ripple filter for mitigating switching-ripple voltages produced by the active filter. Experimental results verify that the hybrid filter achieves harmonic compensation of the source current in all the operating regions from no-load to the rated-load conditions, and that the switching-ripple filter reduces the switching-ripple voltages as expected.

Kondo, Ryota; Akagi, Hirofumi

41

Test of a 2 MVA medium voltage HTS fault current limiter module made of YBCO coated conductors  

NASA Astrophysics Data System (ADS)

A fault current limiter module for medium voltage applications has been built and tested successfully. The module corresponds to one phase of a 3-phase limiter for the 13 kV-class distribution voltage level. The resistive type limiter consists of 15 bifilar coils wound from a total of 15 × 50 m of AMSC's 344S superconductors, a commercially available second generation YBCO tape stabilized by stainless steel laminates. The module has a rated current of 300 Arms and a rated voltage of 7.5 kV corresponding to a nominal apparent power of 2.25 MVA. The cryostat is equipped with commercial current feed-throughs and the module is operated in liquid nitrogen at atmospheric pressure. For long term operation as a closed system a commercial cryogenic refrigerator coldhead is installed. Power tests and dielectric tests of the module have been performed at the IPH Berlin (Institut "Prüffeld für elektrische Hochleistungstechnik") up to prospective currents of 28 kA. In standard power tests at voltages up to 7.8 kV and fault hold times of about 50 ms an excellent limiting performance was observed both at various prospective fault currents and at different fault starting phase angles. Within a second experimental series, an appropriate shunt reactor was connected in parallel to the limiter. The benefit of this method is that the limited current can be adjusted to the customers needs and the required amount of HTS-wire can be also appreciably reduced. The setup of the module and the test results are reported.

Kraemer, H.-P.; Schmidt, W.; Wohlfart, M.; Neumueller, H.-W.; Otto, A.; Verebelyi, D.; Schoop, U.; Malozemoff, A. P.

2008-02-01

42

A Medium-Voltage Motor Drive with a Modular Multilevel PWM Inverter Part I. Experimental Verification by a 400-V, 15-kW Downscaled Model  

NASA Astrophysics Data System (ADS)

This paper presents a medium-voltage motor drive with a three-phase modular multilevel PWM inverter and focuses on its control method and operating performance. This motor drive is particularly suitable for fans, blowers, pumps, and compressors, in which the load torque is proportional to the square of the rotating speed. Particular attention is paid to the dc-capacitor voltage fluctuation of each chopper-cell because it may affect the voltage rating of the power switching devices used. This paper describes the theoretical equations related to the amount of the voltage fluctuation. A downscaled model rated at 400V and 15kW is designed and built to confirm the validity and effectiveness of the nine-level (17-level in line-to-line) PWM inverter that is intended for use in medium-voltage motor drives to achieve energy savings.

Hagiwara, Makoto; Nishimura, Kazutoshi; Akagi, Hirofumi

43

Asset Management of Medium Voltage Cable Networks  

Microsoft Academic Search

This paper describes the background to research currently underway associated with asset management (AM) of degraded cable\\u000a networks in North Queensland. In the paper the main failure mode of cables installed twenty years ago is identified as the\\u000a growth of water trees through the cable insulation. The costs of managing water tree degradation in a large distribution network\\u000a are considered

D Birtwhistle; R Gilbert; J Lyall; B Oyegoke; L Powell; T Saha

44

Cold shrinkable technology for medium voltage cable accessory  

Microsoft Academic Search

A description of the new “cold shrink” technology is presented. The paper is focused on the cold shrink joint, describing from concept to fabrication the main orientations chosen to warranty the reliability of product in service. Some results concerning the product (short and long duration tests) are presented and main advantages given to the user are pointed out. A pre-fabricated

A. Cheenne-Astorino; S. Chatterjee

1996-01-01

45

Practical medium voltage converter topologies for high power applications  

Microsoft Academic Search

Multilevel power conversion has been receiving increasing attention in the past few years for high power applications. Numerous topologies and modulation strategies have been introduced and studied extensively for utility and drive applications in the recent literature. These converters are suitable in high voltage and high power applications due to their ability to synthesize waveforms with better harmonic spectrum and

Peter K. Steimer; Madhav D. Manjrekar

2001-01-01

46

A vector control technique for medium-voltage multilevel inverters  

Microsoft Academic Search

This paper presents a switching strategy for multilevel cascade inverters, based on the space-vector theory. The proposed switching strategy generates a voltage vector with very low harmonic distortion and reduced switching frequency. This new control method is an attractive alternative to the classic multilevel pulsewidth modulation techniques considering the following aspects: (1) voltage and current total harmonic distortion; (2) range

José Rodríguez; Luis Morán; Pablo Correa; Cesar Silva

2002-01-01

47

A vector control technique for medium voltage multilevel inverters  

Microsoft Academic Search

This paper presents a switching strategy for multilevel cascade inverters, based on the space vector theory. The proposed switching strategy generates a voltage vector with very low harmonic distortion and reduced switching frequency. This new control method is an attractive alternative to the classic multilevel PWM techniques considering the following aspects: (i) voltage and current THD, (ii) range of linear

J. Rodriguez; P. Correa; L. Moran

2001-01-01

48

Development, Testing and Installation of a Superconducting Fault Current Limiter for Medium Voltage Distribution Networks  

NASA Astrophysics Data System (ADS)

Since 2009 Ricerca sul Sistema Energetico (RSE S.p.A.) has been involved in the design of resistive-type Superconducting Fault Current Limiter (SFCL) for MV applications to be installed in the A2A Reti Elettriche S.p.A distribution grid in the Milano area. The project started with simulations, design and testing activities for a singlephase device; in this paper we report on the successive step, which is concerned with developing, testing and installation at the hosting utility of the final three-phase SFCL prototype. The result of this research activity is a resistive-type 9 kV/3.4 MVA SFCL device, based on first generation (1G) BSCCO tapes, developed by RSE in the framework of a R&D national project. Owing to the positive test results of partial discharge, dielectric and shortcircuit results the three-phase SFCL device is being to be installed in the A2A distribution grid in the Milano area and it is going to be soon energized starting a one-year long field-testing activity.

Martini, Luciano; Bocchi, Marco; Ascade, Massimo; Valzasina, Angelo; Rossi, Valerio; Angeli, Giuliano; Ravetta, Cesare

49

Abb Inc. medium-voltage products' supply chain analysis, including inventory, supplier scorecard, and risk assessments  

E-print Network

In conformance with ABB's process excellence plan, this thesis study was undertaken to support improvements in on-time delivery of components, decreased order cycles, and reduced inventory levels for ADVAC (spring-mechan ...

Gaskins, Tamboura E. (Tamboura Elyse)

2006-01-01

50

A high speed, medium voltage pulse amplifier for diode reverse transient measurements  

NASA Astrophysics Data System (ADS)

A dc-coupled nonlinear pulse amplifier circuit is presented. The circuit presented can produce 40 V peak-to-peak pulses with 3 ns rise and fall times. This speed is obtained by using class D transistor amplifier stages. This circuit is shown to be useful for measuring the reverse recovery transients of fast switching diodes such as the 1N4148, and fast recovery power rectifiers.

Chudobiak, Michael J.

1995-11-01

51

ESRDC ship notional baseline Medium Voltage Direct Current (MVDC) architecture thermal simulation and visualization  

E-print Network

This work presents a fast visualization and thermal simulation tool developed as part of the Electric Ship Research and Development Consortium (ESRDC) funded by the Office of Naval Research (ONR) that is capable of providing ...

Chryssostomidis, Chryssostomos

2011-01-01

52

Investigator Resources  

Cancer.gov

A Handbook for Clinical Investigators Conducting Therapeutic Clinical Trials Supported by CTEP, DCTD, NCI. The 2014 version 1.2 of the Investigator’s Handbook is a bookmarked PDF file available for download.

53

Investigator Resources  

Cancer.gov

CTEP recognizes the importance of encouraging and supporting young investigators as they embark upon a clinical cancer research career. We have implemented several programs geared to assist young investigators navigate the CTEP program and the LOI development and submission process.

54

Investigator Resources  

Cancer.gov

Below please find instructions to investigators seeking to request specimens from the North American Breast Cancer Group (NABCG) Correlative Sciences Committee (CSC) for use in correlative scientific studies.

55

Fire investigation  

NASA Astrophysics Data System (ADS)

There was considerable progress made on several fronts of fire investigation in the United States in recent years. Progress was made in increasing the quantity of fire investigation and reporting, through efforts to develop the National Fire Incident Reporting System. Improving overall quality of fire investigation is the objective of efforts such as the Fire Investigation Handbook, which was developed and published by the National Bureau of Standards, and the upgrading and expanding of the ""dictionary'' of fire investigation and reporting, the NFPA 901, Uniform Coding for Fire Protection, system. The science of fire investigation as furthered also by new approaches to post fire interviews being developed at the University of Washington, and by in-depth research into factors involved in several large loss fires, including the MGM Grand Hotel in Las Vegas. Finally, the use of special study fire investigations - in-depth investigations concentrating on specific fire problems - is producing new glimpses into the nature of the national fire problem. A brief description of the status of efforts in each of these areas is discussed.

Gomberg, A.

56

Watershed Investigations  

NSDL National Science Digital Library

Investigating local watersheds presents middle school students with authentic opportunities to engage in inquiry and address questions about their immediate environment in an interdisciplinary context. This article describes a collabortive project design, and provides guidelines for teachers who are interested in conducting their own watershed investigations.

Bodzin, Alec; Shive, Louise

2004-01-01

57

Groundwater Investigations  

NSDL National Science Digital Library

Groundwater Investigations is a series of lessons designed to introduce and provide direct experience with physical and computational modeling in a practical scientific context. Each investigation explores basic concepts of the water cycle and pollutant transport within the unsaturated zone of the soil column.

Love, Garrett R.

58

Inca Investigation  

NSDL National Science Digital Library

This OLogy activity gives kids a chance to test their investigative skills while learning about daily life for the Incas. Inca Investigation begins with an introduction to archaeologist Craig Morris and the ancient Inca city that his team excavated in the Andes mountains. Detailed directions are given for how to play Inca Investigation, which includes tips to help them better examine evidence. Each time they correctly identify a place, they are awarded an Inca Chronicle. They have the option of reading the chronicles online or printing their collection of chronicles.

59

Investigator Resources  

Cancer.gov

The Cancer Therapy Evaluation Program (CTEP) of the National Cancer Institute sponsors clinical trials of investigational agents within its Phase I and and Phase II clinical trials networks, as well as through the large Cooperative Groups.

60

Investigation Organizer  

NASA Technical Reports Server (NTRS)

Contents include the folloving:Overview of the Application; Input Data; Analytical Process; Tool's Output; and Application of the Results of the Analysis.The tool enables the first element through a Web-based application that can be accessed by distributed teams to store and retrieve any type of digital investigation material in a secure environment. The second is accomplished by making the relationships between information explicit through the use of a semantic network-a structure that literally allows an investigator or team to "connect -the-dots." The third element, the significance of the correlated information, is established through causality and consistency tests using a number of different methods embedded within the tool, including fault trees, event sequences, and other accident models. And finally, the evidence gathered and structured within the tool can be directly, electronically archived to preserve the evidence and investigative reasoning.

Panontin, Tina; Carvalho, Robert; Keller, Richard

2004-01-01

61

Interactive Investigator  

NSDL National Science Digital Library

Interactive Investigator, available through Virtual Museum Canada, is a website "for anyone with an interest in the different scientific methods used to solve crimes." Users will find a database of forensic science, containing short but informative essays on forensic entomology, toxicology, alcohol analysis, and various other forensic science topics. A simple timeline reviews key dates in the development of forensics, starting with the creation of the Paris Institute for Forensic Science in 1868. But the main feature (and the most fun) is an interactive game, in which players collect and analyze crime scene clues to solve a murder case. Interactive Investigator is also available in French.

62

Temperature Investigations  

NSDL National Science Digital Library

This guided inquiry activity uses a modified version of the Science Writing Heuristic to give undergraduate students an opportunity to refine their use of the scientific method and analytical skills while learning about the factors that influence a regions temperature. Student groups design three sets of experiments that investigate how temperature is affected by: 1) surface albedo; 2) sun angle; and 3) surface composition. For each investigation, the students must develop a research hypothesis, identify the corresponding variables, design and execute an experiment, analyze data, and communicate their ideas to their peers.

Gray, Kyle

63

Investigating Starch  

NSDL National Science Digital Library

In this activity (on pages 10-15), learners investigate starch in human diets and how plants make starch (carbohydrates) to use as their food source. Testing with a dropper of iodine in Part One, learners discover that starch content differs from food to food. In Part Two, learners taste chewed and unchewed food and compare the starch content.

Museum, University O.; Nebraska Cooperative Extension 4-H Youth Development

2001-01-01

64

Investigator perspectives  

Microsoft Academic Search

A detailed presentation is given in the form of viewgraphs on principal investigator requirements ranging from simple to complex payloads. It is stated that the program was very important to the US science community, and that there was already concern that its funding was under stress, impacting the number of missions flown, down from around 44 to 25 or so.

Michael Mendillo

1991-01-01

65

Sunblock Investigation  

NSDL National Science Digital Library

In this "Sid the Science Kid" activity, learners set up a simple experiment to find out how sunscreen counteracts the effects of the sun. Use this activity to explore various topics including the Sun, weather, and sun-safety and health. This activity includes a "Sid the Science Kid" video showing how to conduct the investigation.

Company, The J.

2008-01-01

66

Tetrahedra investigation  

NSDL National Science Digital Library

In this interactive lesson, students use spatial sense and abstract reasoning to investigate colorings of the faces of a tetrahedron. The lesson includes an introductory activity, Flash applets to help students eliminate rotational duplications, and an animated demonstration of the final result. Downloadable teachers notes (doc) and a student worksheet (pdf) are provided.

2011-01-01

67

Laboratory investigations  

SciTech Connect

The primary objectives were to examine the site-specific physical, chemical, and biological factors that impact construction, durability and performance of the proposed 5-MW (sub e) solar pond system at the Salton Sea. The interactions of the water, salt, and soil of the site and on material compatibility were examined. Potential interactions of the water/brine and soil are particularly important because the pond will utilize the naturally occurring clays as a bottom seal. Although there is a considerable and growing solar pond literature, little written information deals with the important site-specific investigations of water, salt, and soil. Therefore, technical effort was directed toward identifying the factors that should be investigated and determining methods of investigation. As a result, a by-product was the development of an approach for site-specific investigations and some specific methodologies. This development should continue in order to establish a generic approach for evaluating the suitability of any site for the construction of large-scale solar ponds.

Not Available

1984-09-01

68

Investigating Sleep  

NSDL National Science Digital Library

In this activity about sleep rhythms (on page 25 of the PDF), learners will investigate how changing the time they go to bed impacts their own sleep patterns. For one night, learners will go to bed one hour earlier than usual. They will observe and record any impacts that this change has on their abilities to fall asleep, and on their usual wake times the next morning. This lesson guide includes background information, setup and management tips, extensions and a handout.

Moreno, Nancy P.; Tharp, Barbara Z.; Vogt, Greg L.

2009-01-01

69

Investigate Biodiversity  

NSDL National Science Digital Library

A great way to learn about biodiversity is by visiting Conservation International's Investigate Biodiversity Web site. Visitors can read about biodiversity hot spots and major threats to the world's species. Of particular interest is the Expeditions Online section, detailing scientific field expeditions. Through this section, you can read daily updates and see photos of teams of scientists conducting biological surveys in remote parts of the world. After learning about Conservation International's research projects, students can follow the online guide to developing their own biodiversity field study. This well designed Web sitehas plenty to offer to anyone interested in biodiversity.

2005-12-08

70

Investigating Atheism  

NSDL National Science Digital Library

With their website, Investigating Atheism, the University of Cambridge hopes to add some clarity to the subject. Despite the attention recent books on atheism have received, they have had a mixed reception from the religious communities and from fellow atheists and agnostics. The goal of the site is to "set these contemporary "God Wars" in their historical context, and to offer a range of perspectives (from all sides) on the chief issues raised by the new atheists." A good place to start exploring this very well organized website is by looking in the Selected Features box on the right side of the homepage. There, a visitor can get an overview of the issues and the players, by clicking on "Current Controversies", "Atheist Politics", "Atheism and Meaning", "Arguments for Disbelief", and "Links". The "Links" section is divided up between Atheistic/Humanistic and Responses to the Debate. Visitors will find that studying atheism can be more complicated than it seems. The "History" tab points out the difficulty in recounting the history of atheism, because there is disagreement over its beginnings and players. Click on "Demographics" on the left side of the page to read about the obstacles faced when trying to get an accurate count of the number of atheists in the world today. Imperfect data is available, however, and such data suggests between 500 million and 750 million people don't believe in God.

71

Advent of fixed type disconnecting circuit breakers in Medium Voltage secondary switchgear: A new arrangement of main circuit functions for simpler and safer operation  

Microsoft Academic Search

The purpose of this paper is to challenge some well-known arrangements of devices like racking trucks, disconnectors, circuit breakers and earthing switches. A new single line diagram will be proposed, more in accordance with needs and expectations of users and future trends in breaking and disconnection techniques. It will be taken in account elements as necessity to implement alternative solutions

Gilles MOESCH; J. Biasse; Yonggang Li; M. Adams

2010-01-01

72

Operational Problems of Primary ENEL (Italian Electricity Board) Power Distribution Station in Naples (Italy). Analysis for Reliability Improvement.  

National Technical Information Service (NTIS)

The paper reports the results of the first part of a research carried out on primary ENEL (Italian Electricity Board) power distribution stations in Naples, Italy. Reliabilty problems, due to electric aging, were investigated relevant to medium voltage su...

E. Elli, W. Mosca, G. De Seta, I. Vitto

1987-01-01

73

2. INVESTIGATOR(S) 3. INTRODUCTION  

E-print Network

1. TITLE 2. INVESTIGATOR(S) 3. INTRODUCTION 4. THEORY OF ALGORITHM/MEASUREMENTS 5. EQUIPMENT 6 ocean_flux_poc_2d.dat: particulate organic carbon (POC) export ocean_flux_tss_2d.dat: sediment export_flux_hco3_XX_map.asc bicarbonate export ocean_flux_poc_XX_map.asc particulate organic carbon (POC) export

74

Training the Physician Investigators  

E-print Network

Training the Physician Investigators of Tomorrow Cleveland ClinicLernerCollegeof Medicine of Case that will set new standards for the training of physician investigators through innovative approaches and the training to successfully pursue a career as a physician investigator. On behalf of the faculty and staff

Rollins, Andrew M.

75

Magsat scientific investigations  

NASA Technical Reports Server (NTRS)

The Magsat spacecraft is providing the first global, vector magnetic survey. Investigations using the Magsat data are being carried out by scientists at NASA's Goddard Space Flight Center, at the U.S. Geological Survey of the Department of the Interior and by 32 selected investigators. Nineteen of the investigators are from the United States and 13 are from various foreign nations. The investigations described fall into four categories; (1) geomagnetic field modeling; (2) crustal magnetic anomaly studies; (3) investigations of the inner Earth: the core, mantle and core-mantle interface; and (4) studies of external current systems.

Langel, R. A.

1980-01-01

76

Investigating the Ocean  

NSDL National Science Digital Library

A collection of inquiry-based lessons using data from the web site of the National Oceanic and Atmospheric Administration/National Environmental Satellite, Data, and Information Service (NOAA/NESDIS). The lessons help students understand issues involving weather and our oceans, using current satellite data. Goals are to identify questions and concepts guiding scientific investigation; design and conduct scientific investigations; and use technology to improve investigations and communications.

77

Investigating Encrypted Material  

NASA Astrophysics Data System (ADS)

When encrypted material is discovered during a digital investigation and the investigator cannot decrypt the material then s/he is faced with the problem of how to determine the evidential value of the material. This research is proposing a methodology of extracting probative value from the encrypted file of a hybrid cryptosystem. The methodology also incorporates a technique for locating the original plaintext file. Since child pornography (KP) images and terrorist related information (TI) are transmitted in encrypted format the digital investigator must ask the question Cui Bono? - who benefits or who is the recipient? By doing this the scope of the digital investigation can be extended to reveal the intended recipient.

McGrath, Niall; Gladyshev, Pavel; Kechadi, Tahar; Carthy, Joe

78

Investigations in Martian Sedimentology  

NASA Technical Reports Server (NTRS)

The purpose of this report is to investigate and discuss the Martian surface. This report was done in specific tasks. The tasks were: characterization of Martian fluids and chemical sediments; mass wasting and ground collapse in terrains of volatile-rich deposits; Mars Rover terrestrial field investigations; Mars Pathfinder operations support; and Martian subsurface water instrument.

Moore, Jeffrey M.

1998-01-01

79

Ancillary investigations in uveitis  

PubMed Central

Ancillary investigations are the backbone of uveitis work-up both for anterior and posterior segment diseases. They help in making the diagnosis, ruling out certain differential diagnosis and monitoring inflammation during the follow-up. This review aims to be an overview describing the role of commonly used investigations for uveitis. PMID:23803477

Gupta, Vishali; Gupta, Amod

2013-01-01

80

Investigating Global Connections  

NSDL National Science Digital Library

In this online interactive, learners investigate changes in the environment at various locations across the United States. Investigations of an Alaskan coastal community, the Pika, coral reef habitat, the American goldfinch, glacier ice melt, and the pine beetle lead learners to discover that our climate is changing.

Service, National P.

2012-07-24

81

Sea Anemone: Investigations.  

ERIC Educational Resources Information Center

Several investigations can be undertaken with live sea anemones. A sea anemone's feeding response, fighting power, color, and symbiotic relationships to other invertebrates (such as a marine hermit crab) can be investigated in the high school classroom. Background information and laboratory procedures are provided. (Author/JN)

Hunt, John D.

1982-01-01

82

Assessment of Biology Investigations.  

ERIC Educational Resources Information Center

Makes a case for the assessment of investigations against the Concept of Evidence in written tests as a potentially more reliable and valid way of assessing the ideas used in all types of biology investigations, thus reducing the distorting effect of assessment on the curriculum. (Author/SOE)

Roberts, Ros; Gott, Richard

2003-01-01

83

Crime Scene Investigation.  

ERIC Educational Resources Information Center

Casting students in grades 5 through 12 in the roles of reporters, lawyers, and detectives at the scene of a crime, this interdisciplinary activity involves participants in the intrigue and drama of crime investigation. Using a hands-on, step-by-step approach, students work in teams to investigate a crime and solve a mystery. Through role-playing…

Harris, Barbara; Kohlmeier, Kris; Kiel, Robert D.

84

Floodplain Development Investigation  

NSDL National Science Digital Library

This investigation involves using spatial thinking and intermediate to advanced Geographic Information Systems (GIS) skills to investigate suburban sprawl in detail, looking at land use decisions made in a rapidly developing suburb west of St. Louis, Missouri. The investigation also helps students to consider the risk/reward tradeoffs made in deciding to build in a desirable location that also happens to be in a floodplain. This investigation introduces several new skills in data management, and makes use of ArcViewâÂÂs statistics functions as land use designations are compared inside and outside of the 100 year floodplain. An optional performance assessment task challenges students to investigate land use decisions before and after the flood of 1993 to analyze how decisions may change after a major natural disaster.

Coulter, Bob

2010-10-13

85

Floodplain Development Investigation  

NSDL National Science Digital Library

This investigation involves using spatial thinking and intermediate to advanced Geographic Information Systems (GIS) skills to investigate suburban sprawl in detail, looking at land use decisions made in a rapidly developing suburb west of St. Louis, Missouri. The investigation also helps students to consider the risk/reward tradeoffs made in deciding to build in a desirable location that also happens to be in a floodplain. This investigation introduces several new skills in data management, and makes use of ArcViewâs statistics functions as land use designations are compared inside and outside of the 100 year floodplain. An optional performance assessment task challenges students to investigate land use decisions before and after the flood of 1993 to analyze how decisions may change after a major natural disaster.

Coulter, Bob

2007-01-01

86

Tectonics Geospatial Investigations  

NSDL National Science Digital Library

Tectonics is a series of geospatial investigations designed to augment existing middle school Earth science curriculum. Students use Web GIS to investigate important tectonics concepts. The investigations include scientific practices, crosscutting concepts, and core ideas from the National Research Council (2012) Framework for K-12 Science Education. Students will explore six questions: 1. What geologic hazards exist near me? Which plate boundary is closest to me? 2. How do we recognize plate boundaries? 3. How does thermal energy move around the Earth? 4. What happens when plates diverge? 5. What happens when plates move sideways past each other? 6. What happens when plates collide?

87

Investigating Perception and Illusion  

NSDL National Science Digital Library

For a motivating and baffling experience, try this investigation of perceptual illusions and their causes. It allows students to observe, analyze, and compare a variety of optical illusions, and also to create their own optical illusions with pencil, pain

Eichinger, John

2009-05-30

88

Access to Investigational Drugs  

MedlinePLUS

... evaluates the requests on a case-by-case basis. There should be reasonable expectation that the drug ... cases, even patients who qualify on a compassionate basis for treatment with an investigational drug might not ...

89

Introduction: Investigating Walls  

NSDL National Science Digital Library

This collection of educational activities and investigations provides ideas on how to teach art, history, geography, language arts, math, and science using the opportunities and examples provided by stone walls.

90

Multiple Principal Investigators  

Cancer.gov

Below is information to learn about NIH definitions, policies, and awards available to apply for support using the Multiple Principal Investigator (PI) model that supports team science. Answers to FAQs are included.

91

Investigational Drug Steering Committee  

Cancer.gov

The Investigational Drug Steering Committee (IDSC) was established in 2005 to collaborate with the NCI in the design and prioritization of early phase drug development trials with agents for which CTEP holds an IND.

92

Student Investigations Using Chromatography  

ERIC Educational Resources Information Center

Three different problems are given for student investigation in determining amino acid compositions, floral pigments, and water soluble amino acids by using the techniques of Roll Chromotography, DISC Chromotography, Thin Layer, and Paper Chromotography. (BR)

Witters, Weldon L.; Bush, Kenneth

1970-01-01

93

Crime Scene Investigation  

NSDL National Science Digital Library

This video segment from IdahoPTV's D4K explores the tools and forensic science that crime scene investigators use to collect evidence to help solve crimes, and study animals, archaeology and paleontology.

Ptv, Idaho

2011-08-09

94

WETLAND DETECTION METHODS INVESTIGATION  

EPA Science Inventory

The purpose of this investigation was to research and document the application of remote sensing technology for wetlands detection. arious sensors and platforms are evaluated for: suitability to monitor specific wetland systems; effectiveness of detailing wetland extent and capab...

95

Investigating Neighborhood Wetlands  

NSDL National Science Digital Library

This activity is field investigation where students map a neighborhood wetland and generate various watershed questions. Students identify engineered structures in or around this wetland and consider how flood water can be controlled.

Tim Shulstad, Lincoln Elementary School, Alexandria, MN, based on The Nature of Science and Engineering, an original activity created by Molly Stoddard, Prairie Wetlands Learning Center, Fergus Falls, MN.

96

Dendritic Growth Investigators  

NASA Technical Reports Server (NTRS)

Representatives of NASA materials science experiments supported the NASA exhibit at the Rernselaer Polytechnic Institute's Space Week activities, April 5 through 11, 1999. From left to right are: Angie Jackman, project manager at NASA's Marshall Space Flight Center for dendritic growth experiments; Dr. Martin Glicksman of Rennselaer Polytechnic Instutute, Troy, NY, principal investigator on the Isothermal Dendritic Growth Experiment (IDGE) that flew three times on the Space Shuttle; and Dr. Matthew Koss of College of the Holy Cross in Worcester, MA, a co-investigator on the IDGE and now principal investigator on the Transient Dendritic Solidification Experiment being developed for the International Space Station (ISS). The image at far left is a dendrite grown in Glicksman's IDGE tests aboard the Shuttle. Glicksman is also principal investigator for the Evolution of Local Microstructures: Spatial Instabilities of Coarsening Clusters.

2000-01-01

97

Supporting Crime Scene Investigation  

Microsoft Academic Search

In this paper, we describe the design and development of mobile technology to support crime scene investigation. We briefly\\u000a review the crime scene investigation processes, arguing that it is highly distributed. We then propose the use of a simple\\u000a case-based reasoning (CBR) system to support some aspects of this activity, and a wearable computer to assist in data collection.\\u000a The

Chris Baber; Paul Smith; Sandeep Panesar; Fan Yang; James Cross

98

Insider Threat Investigations  

Microsoft Academic Search

\\u000a Mr. Sims is a director at PricewaterhouseCoopers in the Advisory Forensic Services practice with 24 years of experience in\\u000a the fields of forensic investigations, cybercrime, national security, and crisis management. He served his country for over\\u000a 10 years at the Federal Bureau of Investigation as a special agent and supervisory special agent. Mr. Sims has responded to\\u000a numerous crisis incidents

Shane Sims

99

Journal of Investigative Dermatology  

NSDL National Science Digital Library

Stanford University's HighWire Press has available this online journal. The Journal of Investigative Dermatology (JID), provided by the Society for Investigative Dermatology and the European Society for Dermatological Research, publishes "original research relevant to all aspects of cutaneous biology and skin disease." Online content includes full text and figures beginning July 1999 (Vol 113, No 1); abstracts are online from January 1975 (Vol 64, No 1), and .pdf files are available from January 1996 (Vol 106, No 1).

100

Investigating Ocean Pollution.  

ERIC Educational Resources Information Center

Describes a fifth-grade class project to investigate two major forms of ocean pollution: plastics and oil. Students work in groups and read, discuss, speculate, offer opinions, and participate in activities such as keeping a plastics journal, testing the biodegradability of plastics, and simulating oil spills. Activities culminate in…

LeBeau, Sue

1998-01-01

101

Investigating Chromatography: selecting variables  

NSDL National Science Digital Library

This activity is a classroom investigation where students separate pigment in dyes in order to learn about mixtures and solutions. They use chromatography to design and experiment with a single variable to answer a question about which ink will separate the most - has the greatest variety of pigment.

Gerber, Nancy

102

Death Investigation Certificate  

E-print Network

: Center for Forensic Science 414-229-0510 cfs@uwm.edu Other Recommended Courses� Chemistry 100 � Chemical combines medicine and law into a common discipline, incorporating multiple forensic specialty areas investigation has evolved into a discipline of forensic science using both forensic medical practitioners

Saldin, Dilano

103

Midcareer and Established Investigators  

Cancer.gov

A listing of links for information on NCI-supported fellowships, research career development awards and training/education research programs for midcareer and established investigators who are pursuing careers in: basic science; clinical science; and cancer prevention; cancer control; or the behavioral or population sciences.

104

An Investigation of Synesthesia  

Microsoft Academic Search

This study was designed to investigate relations between synesthesia (the occurrence of imagery in one sense modality in response to sensations in another) and intellectual and personality functioning. Female (N = 204) and male (N = 170) subjects completed a visual-auditory synesthesia battery, paper-and-pencil synesthesia tests, the Multidimensional Personality Questionnaire (MPQ), and a brief intelligence test. The findings indicate generalized

Charles M. Rader; Auke Tellegen

1987-01-01

105

Galileo radio science investigations  

Microsoft Academic Search

The radio science investigations planned for Galileo's 6-year flight to and 2-year orbit of Jupiter use as their instrument the dual-frequency radio system on the spacecraft operating in conjunction with various US and German tracking stations on Earth. The planned radio propagation experiments are based on measurements of absolute and differential propagation time delay, differential phase delay, Doppler shift, signal

H. T. Howard; V. R. Eshleman; D. P. Hinson; A. J. Kliore; G. F. Lindal; R. Woo; M. K. Bird; H. Volland; P. Edenhoffer; M. Paetzold; H. Porsche

1992-01-01

106

Investigation of ship hydroelasticity  

Microsoft Academic Search

The importance of hydroelastic analysis of large and flexible container ships of today is pointed out. A methodology for investigation of this challenging phenomenon is drawn up and a mathematical model is worked out. It includes definition of ship geometry, mass distribution, structure stiffness, and combines ship hydrostatics, hydrodynamics, wave load, ship motion and vibrations. Based on the presented theory,

Ivo Senjanovi?; Šime Malenica

2008-01-01

107

Civil aircraft accident investigation.  

PubMed

This talk reviews some historic aircraft accidents and some more recent. It reflects on the division of accident causes, considering mechanical failures and aircrew failures, and on aircrew training. Investigation results may lead to improved aircraft design, and to appropriate crew training. PMID:24057309

Haines, Daniel

2013-01-01

108

Investigations in relativistic cosmology  

Microsoft Academic Search

A detailed report is given here of the general investigations carried out by the authors in the field of relativistic cosmology during the past years. The paper consists of two parts.The first part is devoted to a study of the singularities of the cosmological solutions of the gravitational equations. An attempt is made to provide an answer to one of

E.M. Lifshitz; I.M. Khalatnikov

1963-01-01

109

Hypnosis in criminal investigation  

Microsoft Academic Search

Hypnosis has been of value in providing investigative direction and, in the cases described, has led to the solutions of major crimes. The present authors have described the methodology of our team approach which was used in 23 cases comprised of 53 witnesses. New information was developed in more than 60% of the cases utilizing hypnosis. Although only a small

William S. Kroger; Richard G. Douce

1979-01-01

110

Numerical Investigation of Singularities  

E-print Network

Numerical exploration of the properties of singularities could, in principle, yield detailed understanding of their nature in physically realistic cases. Examples of numerical investigations into the formation of naked singularities, critical behavior in collapse, passage through the Cauchy horizon, chaos of the Mixmaster singularity, and singularities in spatially inhomogeneous cosmololgies are discussed.

Beverly K. Berger

1995-12-01

111

SCI: Skin Cancer Investigation  

NSDL National Science Digital Library

Skin Care Investigations offers students the chance to learn more about skin and skin cancer before entering the virtual world of Glowell Clinic, where they will spend time at the helpdesk answering callers' questions about skin protection and in the laboratory assessing whether skin abnormalities are cancerous or not. An interactive assessment allows students and teachers to gauge understanding at this level.

American Association for the Advancement of Science (AAAS;)

2010-05-26

112

Investigating the Insides  

NSDL National Science Digital Library

In this activity, learners work in teams to investigate the composition of unseen materials using a variety of tools. This open-ended engagement activity mimics how scientists discover clues about the interiors of planets with cameras and other instruments onboard spacecraft.

Institute, Lunar A.; Nasa

2011-01-01

113

Biosurveillance in outbreak investigations.  

PubMed

Following the terrorist attacks of September 11 and the anthrax attacks in 2001, public health entities implemented automated surveillance systems based on disease syndromes for early detection of bioterror events and to increase timeliness of responses. Despite widespread adoption, syndromic surveillance systems' ability to provide early notification of outbreaks is unproven, and there is little documentation on their role in outbreak response. We hypothesized that biosurveillance is used in practice to augment classical outbreak investigations, and we used case studies conducted in 2007-08 to determine (1) which steps in outbreak investigations were best served by biosurveillance, and (2) which steps presented the greatest opportunities for improvement. The systems used in the case studies varied in how they functioned, and there were examples in which syndromic systems had identified outbreaks before other methods. Biosurveillance was used successfully for all steps of outbreak investigations. Key advantages of syndromic systems were sensitivity, timeliness, and flexibility and as a source of data for situational awareness. Limitations of biosurveillance were a lack of specificity, reliance on chief complaint data, and a lack of formal training for users. Linking syndromic data to triage notes and medical chart data would substantially increase the value of biosurveillance in the conduct of outbreak investigations and reduce the burden on health department staff. PMID:23448272

Kaydos-Daniels, S Cornelia; Rojas Smith, Lucia; Farris, Tonya R

2013-03-01

114

Ice Core Investigations  

ERIC Educational Resources Information Center

What can glaciers tell us about volcanoes and atmospheric conditions? How does this information relate to our understanding of climate change? Ice Core Investigations is an original and innovative activity that explores these types of questions. It brings together popular science issues such as research, climate change, ice core drilling, and air…

Krim, Jessica; Brody, Michael

2008-01-01

115

Telescope Spacer Design Investigations  

NASA Technical Reports Server (NTRS)

Space-based interferometric gravitational wave observatories will measure changes in the distance between free falling proof masses inside widely separated spacecraft with pm sensitivity. These observatories will use fast telescopes to exchange laser beams. These telescopes are part of the probed optical distances and any length change in the gravitational wave band between secondary and primary can limit the sensitivity of the observatories. Furthermore, the large distance between and space constrains on the spacecraft require to use very fast telescopes with f-numbers approaching unity. These telescopes are very sensitive against any absolute length change which would reduce interferometer visibility and, ultimately, sensitivity. Our group has assembled a Silicon Carbide test structure and investigated its dimensional in the 1 OA-4 to 1 Hz frequency band at different operating temperatures. We also measured the overall length change and started investigating asymmetric length changes during cool down which would lead to misalignments in the telescope.

Livas, Jeffrey; Preston, Alix; Arsenovich, Petar

2011-01-01

116

FCS Technology Investigation Overview  

NASA Technical Reports Server (NTRS)

This working paper provides an overview of the Future Communication Study (FCS) technology investigation progress. It includes a description of the methodology applied to technology evaluation; evaluation criteria; and technology screening (down select) results. A comparison of screening results with other similar technology screening activities is provided. Additional information included in this working paper is a description of in-depth studies (including characterization of the L-band aeronautical channel; L-band deployment cost assessment; and performance assessments of candidate technologies in the applicable aeronautical channel) that have been conducted to support technology evaluations. The paper concludes with a description on-going activities leading to conclusion of the technology investigation and the development of technology recommendations.

Budinger, James; Gilbert, Tricia

2007-01-01

117

The gravimetric geodesy investigation  

NASA Technical Reports Server (NTRS)

The Gravimetric Geodesy Investigation which will utilize altimeter and satellite-to-satellite tracking data from GEOS-C, ATS-F, and other spacecraft as appropriate to improve our knowledge of the earth's gravitational field is discussed. This investigation is interrelated with the study of oceanographic phenomena such as those associated with tides and currents, hence the latter are considered together with gravitational effects in the analysis of the data. The oceanographic effects, each of the order of a meter or two in amplitude and with still smaller uncertainties does not seriously hamper the altimeter gravimetric studies at the five meter level. Laser and satellite-to-satellite tracking data, when combined with the altimeter results, should provide the basis for such studies over wide areas of the ocean surface. Laser and conventional geodetic tracking data from ISAGEX and succeeding campaigns will provide a valuable framework for these analyses.

Siry, J. W.

1971-01-01

118

Genesis Failure Investigation Report  

NASA Technical Reports Server (NTRS)

The-Genesis mission to collect solar-wind samples and return them to Earth for detailed analysis proceeded successfully for 3.5 years. During reentry on September 8, 2004, a failure in the entry, descent and landing sequence resulted in a crash landing of the Genesis sample return capsule. This document describes the findings of the avionics sub-team that supported the accident investigation of the JPL Failure Review Board.

Klein, John

2004-01-01

119

Airplane Wing Investigation  

NSDL National Science Digital Library

This activity (located on page 3 of the PDF) is a full inquiry investigation into Bernoulliâs principle and airplane wings. Learners will design and build their own airplane wing models out of Styrofoam, record their mass, and then use a fan to measure the âweightâ change when air flows over the wing. Results from testing other wing shapes and sizes are then measured to chart relationships between lift and wing size and shape. Relates to linked video, DragonflyTV GPS: Balloon Fiesta.

Twin Cities Public Television, Inc.

2007-01-01

120

Free compressible jet investigation  

NASA Astrophysics Data System (ADS)

The nozzle pressure ratio (NPR) effect on a supersonic turbulent jet was investigated. A dedicated convergent/divergent nozzle together with a flow feeding system was designed and manufactured. A nozzle Mach exit of M j = 1.5 was selected in order to obtain a convective Mach number of M c = 0.6. The flow was investigated for over-expanded, correctly expanded and under-expanded jet conditions. Mach number, total temperature and flow velocity measurements were carried out in order to characterise the jet behaviour. The inlet conditions of the jet flow were monitored in order to calculate the nozzle exit speed of sound and evaluate the mean Mach number distribution starting from the flow velocity data. A detailed analysis of the Mach results obtained by a static Pitot probe and by a particle image velocimetry measurement system was carried out. The mean flow velocity was investigated, and the axial Mach decay and the spreading rate were associated with the flow structures and with the compressibility effects. Aerodynamics of the different jet conditions was evaluated, and the shock cells structures were detected and discussed correlating the jet structure to the flow fluctuation and local turbulence. The longitudinal and radial distribution of the total temperature was investigated, and the temperature profiles were analysed and discussed. The total temperature behaviour was correlated to the turbulent phenomena and to the NPR jet conditions. Self-similarity condition was encountered and discussed for the over-expanded jet. Compressibility effects on the local turbulence, on the turbulent kinetic energy and on the Reynolds tensor were discussed.

De Gregorio, Fabrizio

2014-03-01

121

Tree Growth Investigation  

NSDL National Science Digital Library

This activity (located on page 3 of the PDF) is a full inquiry investigation into tree growth rates. Groups of learners will count tree rings to determine each treeâs age. A thorough sample of other measurements will then be taken to calculate the treesâ fastest, slowest, and overall average growth rate. Presenting the results in a table allows learners to compare data for different types of trees. Relates to linked video, DragonflyTV GPS: Temperate Rainforest.

Twin Cities Public Television, Inc.

2007-01-01

122

Investigating Magnetic Force Fields  

NSDL National Science Digital Library

In this classroom activity, the students will investigate the magnetic pull of a bar magnet at varying distances with the use of paper clips. Students will hypothesize, conduct the experiment, collect the data, and draw conclusions that support their data. Each student will record the experiment and their findings in their science journals. As a class, students will compare each groups' data and their interpretation of the results.

Daryl ("Tish") Monjeau, Bancroft Elementary School, Minneapolis, MN

2012-03-18

123

Investigating Local Ecosystems  

NSDL National Science Digital Library

The purpose of this Science NetLinks lesson is to guide students through investigations of the habitats of local plants and animals; to explore some of the ways animals depend on plants and each other. In order to learn about living environments, young children should begin with direct observation of their immediate surroundings, such as a backyard, schoolyard or local pond. As students observe their environment, they should have many opportunities to record and communicate their findings using words and pictures.

Science Netlinks;

2000-12-06

124

Volcanic Material Catapult Investigation  

NSDL National Science Digital Library

This activity (located on page 3 of the PDF) is a full inquiry investigation into the relationship between an objectâs mass and the distance it is thrown by a catapult. Groups of learners will assemble a simple plastic spoon catapult and test launch âtephraâ (material ejected from volcanoes) of different masses, calculate average throwing distance and graph their recorded results. Relates to linked video, DragonflyTV GPS: Lava Flow.

Twin Cities Public Television, Inc.

2007-01-01

125

DTP - NCI Investigational Drugs  

Cancer.gov

This edition of NCI Investigational Drugs - Chemical Information is designed to provide those involved in various phases of drug development with chemical and physical data on compounds which are past or current development candidates in the Developmental Therapeutics Program, Division of Cancer Treatment Diagnosis and Centers, National Cancer Institute. These range from agents which have only just entered the development pipeline to those which are available commercially.

126

STS investigators' guide  

NASA Technical Reports Server (NTRS)

The capability of the Space Transportation System (STS), the Space Shuttle, to support crew tended and free flyer research in low Earth orbit has opened new possibilities for science in space. For the first time, research equipment can be put into orbit routinely, operated in either a shirtsleeve environment or exposed to space, and then returned to the investigator. NASA, operator of the Shuttle, has implemented a variety of programs to ensure that anyone with a worthy research idea can take advantage of this opportunity. Investigators ranging from high school students to renowned space scientists have already used the Shuttle as a platform for making Earth, atmospheric, and astronomical observations; for performing space plasma physics measurements; and for exploring the effects of microgravity on living organisms and physical processes. For investigators considering a flight experiment for the first time, this guide explains what the Shuttle has to offer, how to arrange to fly an experiment, and what to expect once preparations for the flight are under way.

1989-01-01

127

Physics in Carnacki's investigations  

E-print Network

In the stories of Carnacki, created by the English writer William H. Hodgson and written between 1910 and 1912, we find an interesting mixture of science and fantasy. In spite of the fact that Carnacki is a ghost finder, who investigates in an environment where supernatural is acting, we see the character using technology and sometimes discussing of physics phenomena such as X-rays. The Carnacki's stories can be seen as mirrors of the physics and technology knowledge at the beginning of Twentieth Century, in the society outside scientific circles.

Sparavigna, Amelia

2007-01-01

128

Investigating the Invisible  

NSDL National Science Digital Library

In this open inquiry activity introducing concepts of remote sensing, students will discuss and research different invisible phenomena. They will then test and verify the existence of selected invisible phenomena by using measurement or detection devices. Depending on the phenomena being investigated, some of the following supplies are suggested: thermometer, light meter, decibel meter, telescope, gas sensors, filters, anemometer, and/or radon testing kit. This activity is part of the Ground Truth Studies Teacher Handbook, which provides more than 20 activities to build student understanding of global change and remote sensing, and includes background chapters for teachers, glossary, and appendices.

129

Manual on Subsurface Investigation  

NSDL National Science Digital Library

A series of twelve modules that constitute a comprehensive training course in geotechnical and foundation engineering. Sponsored by the National Highway Institute (NHI) of the Federal Highway Administration (FHWA), the training course is given at different locations in the U.S. The intended audience includes civil engineers and engineering geologists involved in the design and construction of transportation facilities. This manual is designed to present the latest methodologies in the planning,execution and interpretation of the various subsurface investigation methods, and the development of appropriate soil and rock parameters for engineering applications

2008-10-13

130

Investigating stalking crimes.  

PubMed

1. Three types of stalkers that are identified in this crime classification are the non-domestic stalker who may know the target through social contact or from a random meeting in a public place; the domestic stalker who may be known to the target and had a close personal relationship with the target; and the erotomania stalker whose target is typically a public figure. 2. Stalking is conceptualized on a continuum from nondelusional to delusional behavior. 3. Classification of a crime is the first step in the investigative process. PMID:7500303

Wright, J A; Burgess, A G; Burgess, A W; McCrary, G O; Douglas, J E

1995-09-01

131

VAB Sway Investigation  

NASA Technical Reports Server (NTRS)

The Vehicle Assembly Building (VAB) was constructed in the mid-1960s to house the Saturn V moon rocket while it was being assembled. Designed to withstand hurricanes and tropical storms, the V AB has a foundation consisting of 30,000 cubic yards of concrete strengthened by 4,225 steel rods driven 160 feet into limestone bedrock. The goal of the VAB Sway Investigation, which began collecting data in April 201 0 and ended in November 2012, was to quantify the displacement or sway of the VAB as a function of wind loading.

Youngquist, Robert c.; Ihlefeld, Curtis M.; Lane, John E.; Starr, Stanley O.

2013-01-01

132

Investigation of Distant Quasars  

NASA Astrophysics Data System (ADS)

To study physical and morphological characteristics of distant quasars we carry out radio-optical investigation of 30 quasars from the Cambridge 7C catalogue second area (0.097 square radians). All these objects have angular sizes less than 1 arcsec on 102 MHz images. Average values of absolute magnitudes and spectral indices have been calculated for them (M = -26.51 +/- 0.25, a = 0.66+/-0.25). It was shown that 60% of compact radio sources from the FIRST catalogue (1400 MHz) are candidates of distant quasars.

Hovhannisyan, Martik; Andreasyan, R.; Paronyan, G.; Abrahamyan, H.

2014-07-01

133

Laboratory investigation of hypercoagulability.  

PubMed

For many years, the laboratory investigation of patients with thrombophilia has lagged behind that of patients with bleeding diathesis. Improved understanding of the mechanisms that control and regulate coagulation, and the resultant recognition of new defects, have greatly stimulated clinical laboratory interest in this area. Assays to detect resistance to activated protein C; deficiencies of antithrombin, protein C, and protein S; and the presence of antiphospholipid antibodies are widely available and should form part of the investigation of patients that present with idiopathic thrombosis. Such a work-up will likely provide an explanation for thrombosis in 40 to 60% of patients. Abnormalities of fibrinogen and fibrinolysis may explain still more, although such defects are currently considered rare. In addition, presently unrecognized defects almost certainly exist, and the identification of such individuals will undoubtedly improve our understanding of the hemostatic mechanism. Laboratory tests to define the hypercoagulable state are continually being developed. They include whole blood coagulation and platelet function tests and novel activation markers. However, acceptance of these approaches by clinical laboratories has been slow. PMID:9579632

Francis, J L

1998-01-01

134

Bearing fatigue investigation 3  

NASA Technical Reports Server (NTRS)

The operating characteristics of large diameter rolling-element bearings in the ultra high speed regimes expected in advanced turbine engines for high performance aircraft were investigated. A high temperature lubricant, DuPont Krytox 143 AC, was evaluated at bearing speeds to 3 million DN. Compared to the results of earlier, similar tests using a MIL-L-23699 (Type II) lubricant, bearings lubricated with the high density Krytox fluid showed significantly higher power requirements. Additionally, short bearing lives were observed when this fluid was used with AISI M50 bearings in an air atmosphere. The primary mode of failure was corrosion initiated surface distress (fatigue) on the raceways. The potential of a case-carburized bearing to sustain a combination of high-tangential and hertzian stresses without experiencing race fracture was also investigated. Limited full scale bearing tests of a 120 mm bore ball bearing at a speed of 25,000 rpm (3 million DN) indicated that a carburized material could sustain spalling fatigue without subsequent propagation to fracture. Planned life tests of the carburized material had to be aborted, however, because of apparent processing-induced material defects.

Nahm, A. H.; Bamberger, E. N.; Signer, H. R.

1982-01-01

135

Magnetospheric space plasma investigations  

NASA Astrophysics Data System (ADS)

Topics and investigations covering this period of this semiannual report period (August 1994 - January 1995) are as follows: (1) Generalized SemiKinetic (GSK) modeling of the synergistic interaction of transverse heating of ionospheric ions and magnetospheric plasma-driven electric potentials on the auroral plasma transport. Also, presentations of GSK modeling of auroral electron precipitation effects on ionospheric plasma outflows, of ExB effects on such outflow, and on warm plasma thermalization and other effects during refilling with pre-existing warm plasmas; (2) Referees' reports received on the statistical study of the latitudinal distributions of core plasmas along the L = 4.6 field line using DE-1/RIMS data. Other work is concerned in the same field, field-aligned flows and trapped ion distributions; and (3) A short study has been carried out on heating processes in low density flux tubes in the outer plasmasphere. The purpose was to determine whether the high ion temperatures observed in these flux tubes were due to heat sources operating through the thermal electrons or directly to the ions. Other investigations center along the same area of plasmasphere-ionosphere coupling. The empirical techniques and model, the listing of hardware calibrated, and/or tested, and a description of notable meetings attended is included in this report, along with a list of all present publication in submission or accepted and those reference papers that have resulted from this work thus far.

Comfort, Richard H.; Horwitz, James L.

1995-02-01

136

Magnetospheric space plasma investigations  

NASA Technical Reports Server (NTRS)

Topics and investigations covering this period of this semiannual report period (August 1994 - January 1995) are as follows: (1) Generalized SemiKinetic (GSK) modeling of the synergistic interaction of transverse heating of ionospheric ions and magnetospheric plasma-driven electric potentials on the auroral plasma transport. Also, presentations of GSK modeling of auroral electron precipitation effects on ionospheric plasma outflows, of ExB effects on such outflow, and on warm plasma thermalization and other effects during refilling with pre-existing warm plasmas; (2) Referees' reports received on the statistical study of the latitudinal distributions of core plasmas along the L = 4.6 field line using DE-1/RIMS data. Other work is concerned in the same field, field-aligned flows and trapped ion distributions; and (3) A short study has been carried out on heating processes in low density flux tubes in the outer plasmasphere. The purpose was to determine whether the high ion temperatures observed in these flux tubes were due to heat sources operating through the thermal electrons or directly to the ions. Other investigations center along the same area of plasmasphere-ionosphere coupling. The empirical techniques and model, the listing of hardware calibrated, and/or tested, and a description of notable meetings attended is included in this report, along with a list of all present publication in submission or accepted and those reference papers that have resulted from this work thus far.

Comfort, Richard H.; Horwitz, James L.

1995-01-01

137

Clinical Investigation in Psychiatry  

PubMed Central

A study involving correlations between personality and the fasting serum cholesterol level of normal volunteers on a fat-free diet was used to illustrate techniques of clinical investigation in psychiatry. Precise data were not quoted, but the procedure was described to show how behavioural studies differ from biological ones. Somatotyping (no significant correlation), excretion of catecholamines under stress (raised with high cholesterol levels) and classical conditioning (no significant correlation) were used as examples of simple biological functions. These were contrasted with trait ratings where one observer predicted cholesterol levels with a high degree of accuracy and another with a low and unreliable one. It seemed that the most important trait being rated was “aggressiveness”, and this was probably differentially elicited by the two observers, the one male and authoritarian, the other female and permissive. Such an interaction distorted the information obtained to a degree seldom seen in other data-gathering situations. Estimated and actual achievement on a competitive pin-ball game failed to show significant correlations with other traits. Questionnaires on the attitudes of the subjects' mothers suggested some correlation between severity of training and aggressivity. The techniques of personality investigation described embraced behavioural observations which, it was suggested, were ill-taught in existing undergraduate medical curricula. PMID:13989251

Sloane, R. Bruce; Payne, R. W.; Inglis, J.

1963-01-01

138

Investigation of macrocytic anemia.  

PubMed

The three most common causes of macrocytosis--vitamin B12 or folate deficiency, liver disease, and reticulocytosis--usually can be differentiated on the basis of red cell indexes and morphologic findings. Bone marrow studies are not indicated. In reticulocytosis, the mean corpuscular volume (MCV) rarely exceeds ll0 cu mu and a reticulocyte count quickly establishes the diagnosis. In liver disease, macrocytosis is also mild and uniform. The RBCs are round. In megaloblastic anemia, the MCV may exceed 150 cu mu. The RBCs vary considerably in size and shape. The macrocytes tend to be oval. Serum vitamin B12 determination remains the best test for unmasking vitamin B12 deficiency. It should be ordered in conjunction with serum and red cell folate determinations in the course of investigating a macrocytic anemia. When vitamin B12 deficiency has been established, a Schilling test or plasma uptake test is indicated to pinpoint the cause. PMID:368738

Ward, P C

1979-02-01

139

Dynamic airfoil stall investigations  

NASA Technical Reports Server (NTRS)

Experimental and computational investigations of the dynamic stall phenomenon continue to attract the attention of various research groups in the major aeronautical research laboratories. There are two reasons for this continued research interest. First, the occurrence of dynamic stall on the retreating blade of helicopters imposes a severe performance limitation and thus suggests to search for ways to delay the onset of dynamic stall. Second, the lift enhancement prior to dynamic stall presents an opportunity to achieve enhanced maneuverability of fighter aircraft. A description of the major parameters affecting dynamic stall and lift and an evaluation of research efforts prior to 1988 has been given by Carr. In this paper the authors' recent progress in the development of experimental and computational methods to analyze the dynamic stall phenomena occurring on NACA 0112 airfoils is reviewed. First, the major experimental and computational approaches and results are summarized. This is followed by an assessment of our results and an outlook toward the future.

Platzer, M. F.; Chandrasekhara, M. S.; Ekaterinaris, J. A.; Carr, L. W.

1992-01-01

140

High lift wake investigation  

NASA Technical Reports Server (NTRS)

The behavior of wakes in adverse pressure gradients is critical to the performance of high-lift systems for transport aircraft. Wake deceleration is known to lead to sudden thickening and the onset of reversed flow; this 'wake bursting' phenomenon can occur while surface flows remain attached. Although known to be important for high-lift systems, few studies of such decelerated wakes exist. In this study, the wake of a flat plate has been subjected to an adverse pressure gradient in a two-dimensional diffuser, whose panels were forced to remain attached by use of slot blowing. Pitot probe surveys, L.D.V. measurements, and flow visualization have been used to investigate the physics of this decelerated wake, through the onset of reversed flow.

Sullivan, J. P.; Schneider, S. P.; Hoffenberg, R.

1996-01-01

141

Pellet detector investigation  

SciTech Connect

The presence of voids and contaminants in the extruded polyethylene insulation of distribution cable can cause premature cable failure. A recent EPRI investigation sought to use an experimental far-infrared laser (FIRL) to identify impurities in cable insulation manufactured from specially inspected pellets. 15 kV XLPE cables were made from three lots of insulation material which had been scanned 0%, 2% and 100% by a pellet inspection device. The cables were then examined with the FIRL (Far Infrared Laser Instrument for Cable Inspection). The 0% inspected cable had more defect indications on the FIRL, appeared dirtier and had the roughest surface of three cables. However, AC breakdown tests on unaged and aged (30 and 90 days) cables failed to reveal any statistically significant differences between cables made with the three lots of material. 10 figs., 6 tabs.

Jones, R.P.; Starrett, W.A. (BICC Cables Corp., Indianapolis, IN (United States))

1991-10-01

142

Vitamin D Investigation  

NASA Technical Reports Server (NTRS)

The solar dosimeter, a spinoff from NASA solar cell technology, measures the amount of solar radiation to which its wearer is exposed. It was used in a University of Cincinnati Medical Center investigation into the effect of sunlight exposure on maintaining vitamin D status in infants. The infants were exposed to sunlight and records were kept by mothers. Each baby wore a solar dosimeter. The two circular "eyes" in the instrument are silicon photovoltaic detectors which collect solar energy, convert it to electric signals and transmit the charge to E-cells that record the charge by plating silver ions onto an electrode. The time required to plate the silver measures the radiation received. The University found the solar dosimeter to be very effective.

1986-01-01

143

Investigations of lunar materials  

NASA Technical Reports Server (NTRS)

The investigations were directed at determining the radiation history and surface chronology of lunar materials using the etched particle track technique. The major lunar materials studied are the igneous rocks and double core from Apollo 12, the breccia and soil samples from Apollo 14, and the core samples from Luna 16. In the course of this work two new and potentially important observations were made: (1) Cosmic ray-induced spallation-recoil tracks were identified. The density of such tracks, when compared with the density of tracks induced by a known flux of accelerator protons, yields the time of exposure of a sample within the top meter or two of moon's surface. (2) Natural, fine scale plastic deformation was found to have fragmented pre-existing charged particle tracks, allowing the dating of the mechanical event causing the deformation.

Comstock, G. M.; Fvwaraye, A. O.; Fleischer, R. L.; Hart, H. R., Jr.

1972-01-01

144

Investigation of erectile dysfunction  

PubMed Central

Erectile dysfunction (ED) represents a common and debilitating condition with a wide range of organic and non-organic causes. Physical aetiologies can be divided into disorders affecting arterial inflow, the venous occlusion mechanism or the penile structure itself. Various imaging modalities can be utilised to investigate the physical causes of ED, but penile Doppler sonography (PDS) is the most informative technique, indicated in those patients with ED who do not respond to oral pharmacological agents (e.g. phosphodiesterase type 5 inhibitors). This review will examine the anatomical and physiological basis of penile erection, the method for performing PDS and features of specific causes of ED, and will also consider the alternative imaging modalities available. PMID:23118101

Patel, D V; Halls, J; Patel, U

2012-01-01

145

HALOE Science Investigation  

NASA Technical Reports Server (NTRS)

This cooperative agreement has investigated a number of spectroscopic problems of interest to the Halogen Occultation Experiment (HALOE). The types of studies performed are in two parts, namely, those that involve the testing and characterization of correlation spectrometers and those that provide basic molecular spectroscopic information. In addition, some solar studies were performed with the calibration data returned by HALOE from orbit. In order to accomplish this a software package was written as part of this cooperative agreement. The HALOE spectroscopic instrument package was used in various tests of the HALOE flight instrument. These included the spectral response test, the early stages of the gas response test and various spectral response tests of the detectors and optical elements of the instruments. Considerable effort was also expended upon the proper laboratory setup for many of the prelaunch tests of the HALOE flight instrument, including the spectral response test and the gas response test. These tests provided the calibration and the assurance that the calibration was performed correctly.

Benner, D. Chris

1998-01-01

146

Kapton HN investigations  

SciTech Connect

Kapton HN properties and the properties of the slip additive calcium phosphate dibasic (CaHPO{sub 4}) were investigated. Impurity analyses were performed on the compound by inductively coupled plasma (ICP) and ion chromatography (IC). Other analyses on the slip additive included: processing solution -- dissolution analysis, high-explosive compatibility studies, scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), and particle size distribution. Testing and analyses were also performed on Kapton HN film and other polyimide films that could serve as possible replacements for Kapton HN. The polyimide films that were tested are: Upilex-R, Upilex-S, Upilex-SGA, and Apical. The analyses performed were: infrared (IR), x-ray photoelectron spectroscopy (XPS), SEM/EDS, high-potential breakdown testing, (PVD) physical vapor deposition adhesion tests, and peel tests. Upilex-S flyer cables were also fabricated and successfully test fired. In addition to these raw material tests, production cables were chemically treated and destructively (high potential) tested. A long-term aging environment for production cables was also selected, and aging tests were begun. 9 figs., 7 tabs.

Williams, M.K.; Huelskamp, M.A.; Armstrong, K.P.; Brandon, J.L.; Lavoie, J.M. (EG and G Mound Applied Technologies, Miamisburg, OH (USA)); Smith, A.E. (Sandia National Labs., Albuquerque, NM (USA))

1990-09-28

147

Sabatier Catalyst Poisoning Investigation  

NASA Technical Reports Server (NTRS)

The Carbon Dioxide Reduction Assembly (CRA) on the International Space Station (ISS) has been operational since 2010. The CRA uses a Sabatier reactor to produce water and methane by reaction of the metabolic CO2 scrubbed from the cabin air and the hydrogen byproduct from the water electrolysis system used for metabolic oxygen generation. Incorporating the CRA into the overall air revitalization system has facilitated life support system loop closure on the ISS reducing resupply logistics and thereby enhancing longer term missions. The CRA utilizes CO2 which has been adsorbed in a 5A molecular sieve within the Carbon Dioxide Removal Assembly, CDRA. There is a potential of compounds with molecular dimensions similar to, or less than CO2 to also be adsorbed. In this fashion trace contaminants may be concentrated within the CDRA and subsequently desorbed with the CO2 to the CRA. Currently, there is no provision to remove contaminants prior to entering the Sabatier catalyst bed. The risk associated with this is potential catalyst degradation due to trace organic contaminants in the CRA carbon dioxide feed acting as catalyst poisons. To better understand this risk, United Technologies Aerospace System (UTAS) has teamed with MSFC to investigate the impact of various trace contaminants on the CRA catalyst performance at relative ISS cabin air concentrations and at about 200/400 times of ISS concentrations, representative of the potential concentrating effect of the CDRA molecular sieve. This paper summarizes our initial assessment results.

Nallette, Tim; Perry, Jay; Abney, Morgan; Knox, Jim; Goldblatt, Loel

2013-01-01

148

Ship Creek bioassessment investigations  

SciTech Connect

Pacific Northwest Laboratory (PNL) was asked by Elmendorf Air Force Base (EAFB) personnel to conduct a series of collections of macroinvertebrates and sediments from Ship Creek to (1) establish baseline data on these populations for reference in evaluating possible impacts from Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) activities at two operable units, (2) compare current population indices with those found by previous investigations in Ship Creek, and (3) determine baseline levels of concentrations of any contaminants in the sediments associated with the macroinvertebrates. A specific suite of indices established by the US Environmental Protection Agency (EPA) was requested for the macroinvertebrate analyses; these follow the Rapid Bioassessment Protocol developed by Plafkin et al. (1989) and will be described. Sediment sample analyses included a Microtox bioassay and chemical analysis for contaminants of concern. These analyses included, volatile organic compounds, total gasoline and diesel hydrocarbons (EPA method 8015, CA modified), total organic carbon, and an inductive-coupled plasma/mass spectrometry (ICP/MS) metals scan. Appendix A reports on the sediment analyses. The Work Plan is attached as Appendix B.

Cushing, C.E.; Mueller, R.P.; Murphy, M.T.

1995-06-01

149

Aquifer stability investigations  

SciTech Connect

The study of compressed air energy storage (CAES) in porous rock reservoirs is carried out within the Reservoir Stability Studies Program at Pacific Northwest Laboratory. The goal of the study is to establish criteria for long-term stability of aquifer CAES reservoirs. These criteria are intended to be guidelines and check lists that utilities and architect-engineering firms may use to evaluate reservoir stability at candidate CAES sites. These criteria will be quantitative where possible, qualitative where necessary, and will provide a focal point for CAES relevant geotechnical knowledge, whether developed within this study or available from petroleum, mining or other geotechnical practices using rock materials. The Reservoir Stability Studies Program had four major activities: a state-of-the-art survey to establish preliminary stability criteria and identify areas requiring research and development; numerical modeling; laboratory testing to provide data for use in numerical models and to investigate fundamental rock mechanics, thermal, fluid, and geochemical response of aquifer materials; and field studies to verify the feasibility of air injection and recovery under CAES conditions in an aquifer, to validate and refine the stability criteria, and to evaluate the accuracy and adequacy of the numerical and experimental methodologies developed in previous work. Three phases of study, including preliminary criteria formulation, numerical model development, and experimental assessment of CAES reservoir materials have been completed. Present activity consists of construction and operation of the aquifer field test, and associated numerical and experimental work in support of that activity. Work is presently planned to be complete by 1983 at the end of the field test. At that time the final stability criteria for aquifers will be issued. Attached here also are preliminary criteria for aquifers.

Allen, R.D.; Doherty, T.J.

1981-09-01

150

Chemistry. Student Investigations and Readings. Investigations in Natural Science.  

ERIC Educational Resources Information Center

Investigations in Natural Science is a program in secondary school biology, chemistry, and physics based upon the description of science as a quest for knowledge, not the knowledge itself. This student manual contains the 19 chemistry investigations. These investigations focus on concepts related to: interactions with water; salt and calcium;…

Renner, John W.; And Others

151

Artificial Selection Lab, Investigation #1  

NSDL National Science Digital Library

This is the 2012 inquiry-based Advanced Placement Investigation into Artificial Selection (#1). The investigation was developed by the College Board for use in AP Biology classes. This inquiry is guided by the question, Can extreme selection change expression of aquantitative trait in a population in one generation? Students study and carry out an artificial selection investigation using Wisconsin Fast Plants (Brassica rapa).

Approach, Ap B.

152

Credible investigation of air accidents  

Microsoft Academic Search

Within the United Kingdom the Air Accidents Investigation Branch (AAIB) has been used as a model for the other transport modes accident investigation bodies. Government Ministers considered that the AAIB’s approach had established the trust of the public and the aviation industry in its ability to conduct independent and objective investigations. The paper will examine the factors that are involved

K Smart

2004-01-01

153

GULF OF MEXICO PLANKTON INVESTIGATIONS,  

E-print Network

GULF OF MEXICO PLANKTON INVESTIGATIONS, 1951-53 Marine Biological Laboratory! LIBKART WOODS HOLE OF MEXICO PLANKTON INVESTIGATIONS: 1951-53 by Edgar L. Arnold, Jr. Fishery Research Biologist Gulf Fishery, Edgar L Gulf of Mexico plankton investigations: 1951-53. Wash- ington, U. S. Dept. of the Interior, Fish

154

Investigating \\  

Microsoft Academic Search

Having friends or being part of a friendship or peer group is a significant social achievement for adolescents and an indicator of social competence (Berndt, 1990). Whilst it has been acknowledged that child peer influence varies with age, gender and product situations, previous findings do not consider adolescent peer influence in relation to the family structure and type. This paper

Peter J Nuttall; Julie Tinson

155

Accessing and Investigating Population Data  

NSDL National Science Digital Library

In this activity, students investigate population projections from 1990-2100 using data from the U.S. Census Bureau Web. Using the five specific population pyramids, students investigate population projection data for the United States over a 110-year period. They examine how the population data is distributed over time and explain what factors might contribute to these trends. An activity sheet and thoughtful questions, included in the lesson plan, guide the class investigation.

Burton, Grace M.; Midgett, Carol

2000-01-01

156

Multidisciplinary perspective on accident investigation  

Microsoft Academic Search

The increasing complexity of many computer-controlled application processes is placing increasing demands on the investigation of adverse events. At the same time, there is a growing realisation that accident investigators must consider a wider range of contributory and contextual factors that help to shape human behaviour in the causes of safety-related incidents. A range of techniques have been developed to

S. Basnyata

157

Diving fatality investigations: recent changes.  

PubMed

Modifications to the investigation procedures in diving fatalities have been incorporated into the data acquisition by diving accident investigators. The most germane proposal for investigators assessing diving fatalities is to delay the drawing of conclusions until all relevant diving information is known. This includes: the accumulation and integration of the pathological data; the access to dive computer information; re-enactments of diving incidents; post-mortem CT scans and the interpretation of intravascular and tissue gas detected. These are all discussed, with reference to the established literature and recent publications. PMID:24986727

Edmonds, Carl; Caruso, James

2014-06-01

158

Haematuria: classification, causes and investigations.  

PubMed

The majority of patients who attend haematuria clinics for investigation of blood in their urine will be found to have either no cause or a benign cause. Between 20% and 25% of people with visible blood in their urine and 5-10% of people with non-visible blood in their urine will be diagnosed with a urological malignancy, i.e. bladder, kidney or prostate cancer. Haematuria is therefore a significant symptom that should be investigated promptly and thoroughly to exclude cancer as quickly as possible. This article gives an overview of the causes of haematuria and the investigations that patients will undergo when referred to a haematuria clinic. PMID:25382080

Bagnall, Pauline

2014-11-01

159

Investigating Special Properties of Light  

NSDL National Science Digital Library

In this activity, students will investigate various aspects of the behavior of light. First, they will use diffraction gratings to view the colors or spectrum produced by visible light, then hold the diffraction grating in front of different light sources and record the colors that they see. They will examine common materials to determine whether they are transparent, translucent, or opaque and use a compact disk as a diffraction grating to look at different types of lights. They will also investigate the additive properties of color using spinning disks, investigate mirages with the help of a penny in a glass of water, and explore the connection between light and heat energy.

160

Investigation of ultraviolet interstellar extinction  

NASA Technical Reports Server (NTRS)

The progress made during the past six months in utilizing Celescope OAO-2 data in a study of extinction is reported along with conclusions drawn from each inquiry. Areas recommended for further investigation are indicated.

Payne-Gaposchkin, C.; Haramundanis, K. L.

1973-01-01

161

Investigating Forces: Balloon car activity  

NSDL National Science Digital Library

This is a guided inquiry-based lab that investigates forces exerted on a group of student-designed and engineered "balloon cars". Each group of students is then challenged to build a "balloon car" that travels a maximum distance.

162

An Investigation on Quadratic Equations.  

ERIC Educational Resources Information Center

Argues that exploring a familiar topic or examination question in a novel manner is a useful way to find topics for mathematical investigation in the classroom. The example used to illustrate the premise is a quadratic equation. (PK)

Hirst, Keith

1988-01-01

163

Fermilab: Data-based Investigations  

NSDL National Science Digital Library

This is a set of six student investigations developed to support core proficiencies via use of data available through national laboratories. Investigations appropriate for high school include: Searching for the Top Quark Mass, Investigating Special Relativity, Cosmic Ray e-Lab, and Search for Higgs. Investigations for both middle school and high school include: Sloan Sky Server Projects and Simply Prairie. All data is freely available for download, with explicit instructions provided in the teacher's guide. The package includes student activity pages and an online homepage for learners. A goal of the project is to promote the teaching of modern physics topics, using data analysis as the framework for study. Fermilab is a national science laboratory whose primary focus of research is high energy physics. It is the home of the Tevatron, the world's second-largest particle accelerator.

Laboratory, Fermi N.

2011-09-14

164

Investigation of Zerodur material processing  

NASA Technical Reports Server (NTRS)

The Final Report of the Center for Applied Optics (CAO), of The University of Alabama (UAH) study entitled 'Investigation of Zerodur Material Processing' is presented. The objectives of the effort were to prepare glass samples by cutting, grinding, etching, and polishing block Zerodur to desired specifications using equipment located in the optical shop located in the Optical System Branch at NASA/MSFC; characterize samples for subsurface damage and surface roughness; utilize Zerodur samples for coating investigations; and perform investigations into enhanced optical fabrication and metrology techniques. The results of this investigation will be used to support the Advanced X Ray Astrophysics Facility (AXAF) program as well as other NASA/MSFC research programs. The results of the technical effort are presented and discussed.

Johnson, R. Barry

1993-01-01

165

Investigative Case - "Goodbye Honey Buckets"  

NSDL National Science Digital Library

Students will investigate arctic geology and hydrology as well as tundra ecology as they consider options for sewage treatment. Public safety, environmental impact, and issues of construction and engineering will be explored.

Developed by Lana McNeil, College of Rural Alaska, Nome for Lifelines Online. (http://bioquest.org/lifelines/index.html)

166

Experimental investigation of soliton molecules  

Microsoft Academic Search

Detailed experimental investigations of the recently discovered temporal soliton molecules are reported. The optical fiber length was now extended; thus stable and unstable regimes of the soliton molecule can be distinguished from another more precisely.

H. Hartwig; M. Stratmann; F. Mitschke

2006-01-01

167

WIRE Mishap Investigation Board Report  

E-print Network

Volume 1 WIRE Mishap Investigation Board Report June 8, 1999 #12;2 Table of Contents WIRE MISHAP........................................................................... 10 � WIRE Mishap Electronics Analysis: Failure Mechanism Determination.................... 17 � Summary of the Mishap

Rhoads, James

168

PMB — Investigator Registration Expiration Date  

Cancer.gov

Skip to Content Home | Investigator Resources | Protocol Development | Initiatives/Programs/Collaborations | Links to More Resources | Funding Opportunities | About CTEP Home | Sitemap | Contact CTEP Search this site Pharmaceutical Management Branch

169

Investigating Kinetic and Potential Energy  

NSDL National Science Digital Library

Students use media resources and an in-class investigation to explore the types of energy within different types of systems. They also use the formulas for kinetic and potential energy to examine the path of a projectile.

Foundation, Wgbh E.

2007-04-19

170

SOFIA general investigator science program  

NASA Astrophysics Data System (ADS)

SOFIA is a joint project between NASA and DLR, the German Aerospace Center, to provide the worldwide astronomical community with an observatory that offers unique capabilities from visible to far-infrared wavelengths. SOFIA consists of a 2.7-m telescope mounted in a highly modified Boeing 747-SP aircraft, a suite of instruments, and the scientific and operational infrastructure to support the observing program. This paper describes the current status of the observatory and details the General Investigator program. The observatory has recently completed major development activities, and it has transitioned into full operational status. Under the General Investigator program, astronomers submit proposals that are peer reviewed for observation on the facility. We describe the results from the first two cycles of the General Investigator program. We also describe some of the new observational capabilities that will be available for Cycle 3, which will begin in 2015.

Young, Erick T.; Andersson, B.-G.; Becklin, Eric E.; Reach, William T.; Sankrit, Ravi; Zinnecker, Hans; Krabbe, Alfred

2014-07-01

171

100 Areas CERCLA ecological investigations  

SciTech Connect

This document reports the results of the field terrestrial ecological investigations conducted by Westinghouse Hanford Company during fiscal years 1991 and 1992 at operable units 100-FR-3, 100-HR-3, 100-NR-2, 100-KR-4, and 100-BC-5. The tasks reported here are part of the Remedial Investigations conducted in support of the Comprehensive Environmental Response, compensation, and Liability Act of 1980 studies for the 100 Areas. These ecological investigations provide (1) a description of the flora and fauna associated with the 100 Areas operable units, emphasizing potential pathways for contaminants and species that have been given special status under existing state and/or federal laws, and (2) an evaluation of existing concentrations of heavy metals and radionuclides in biota associated with the 100 Areas operable units.

Landeen, D.S.; Sackschewsky, M.R.; Weiss, S.

1993-09-01

172

Investigation of transient overvoltages in heavily meshed low-voltage underground distribution networks  

NASA Astrophysics Data System (ADS)

The analysis of overvoltages in electrical distribution networks is of considerable significance since they may damage the power system infrastructure and the associated electrical equipment. Overvoltages in distribution networks arise due to switching transients, resonance, lightning strikes and ground faults, among other causes. The operation of network protectors (NWP), low voltage circuit breakers with directional power relay, in a secondary network prevents the continuous flow of reverse power. There are three modes of operation for the network protectors: sensitive, time delayed, and insensitive. In case of a fault, although all of the network protectors sense the fault at the same time, their operation is not simultaneous. Many of them open very quickly with opening times similar to those of the feeder breaker. However, some operate a few cycles later, others take several seconds to open and a few might even fail to operate. Therefore, depending on the settings of the network protectors, faults can last for significantly long time due to backfeeding of current from the low voltage (LV) network into the medium voltage (MV) network. In this work, low voltages are defined as 208V/460V and medium voltage are defined as 25kV/35kV. This thesis presents overvoltages which arise because of the occurrence of a single-line-to-ground (SLG) fault on the MV side (connected in delta) of the system. The thesis reveals that overvoltage stresses are imposed on insulation, micro-processor controlled equipment, and switching devices by overvoltages during current backfeeding. Also, it establishes a relationship between overvoltage magnitude, its duration, and the network loading conditions. Overvoltages above 3 p.u. may be developed as a result of a simultaneous occurrence of three phenomena: neutral displacement, Ferranti effect, and magnetic current chopping. Furthermore, this thesis exposes the possibility of occurrence of the ferro-resonance phenomena in a distribution network having secondary grid, making the study of extreme importance especially in the case of a misoperating network protector. The test systems for both studies were designed following the conventional distribution network with secondary grid, similar to those in the New York City Area. Simulations were performed using the electro-magnetic transient program revised version (EMTP-RV) considering detailed representation of system components as well as the non-linear magnetization and losses of transformers.

Salcedo Ulerio, Reynaldo Odalis

173

Investigation of the Challenger Accident  

NASA Technical Reports Server (NTRS)

The work of the Presidential Commission on the Space Shuttle Challenger Accident (hereafter referred to as the Rogers Commission) and the work of the National Aeronautics and Space Administration in investigating the causes of the accident were reviewed. In addition to reviewing the five volumes of the Rogers Commission, the entire direct on-line Rogers Commission data base, which included full-text and document retrieval capability was also reviewed. The findings and recommendations contained also include materials submitted for the record, staff investigations, interviews, and trips.

1986-01-01

174

Thermal investigations on social insects  

Microsoft Academic Search

Social insects (honey- and bumblebees, wasps, hornets, ants and termites) are interesting in many aspects, among them the energetic advantages of social life and conquering of unfavourable territories. Own investigations and data from literature deal with the energy metabolism of these insects (except termites because of experimental difficulties), with locomotor activities, energy balances of foraging, energy saving by insulation of

E. Schmolz; I. Lamprecht

175

Investigation following resuscitated cardiac arrest.  

PubMed

Roughly two thirds of resuscitated cardiac arrests in children and youth are due to inherited heart diseases. The most commonly implicated are the cardiac ion channelopathies long QT syndrome, CPVT (catecholaminergic polymorphic ventricular tachycardia) and Brugada syndrome. Diagnosis is pivotal to further management of the child if he/she survives, and also to other family members who may be at risk. Thorough investigation of the cardiac arrest survivor is essential to either identify or exclude inherited heart disease. If standard cardiac investigation does not reveal a diagnosis, pharmacological provocation tests are needed to unmask electrocardiographic signs of disease, even if, due to severe brain injury, it is planned ultimately to allow a natural death. Examples are the ajmaline/flecainide challenge for Brugada syndrome and epinephrine for CPVT. A supportive, informative and sympathetic approach to the family is essential. An arrhythmia specialist and a cardiac genetic service should be involved early, with storage of DNA and cardiac/genetic investigation of the family. This review proposes a diagnostic algorithm-based approach to the investigation of this increasingly common clinical scenario. PMID:23060598

Skinner, Jonathan R

2013-01-01

176

Investigating Gender Influences on Coping.  

ERIC Educational Resources Information Center

A study was conducted at Southern Alberta Institute of Technology (SAIT) to investigate gender influences on coping strategies by tracking multiple episodes of demands and coping strategies throughout an academic year. The study sample consisted of 94 students enrolled in 2-year academic programs having at least a 70/30 gender ratio. From a pool…

Arthur, Nancy; Hiebert, Bryan

177

Defining Problems and Planning Investigations  

NSDL National Science Digital Library

This lesson, if well planned out and conducted properly, addresses every component of the benchmark it is intended to cover. It involves a whole-group segment, during which the teacher provides a demonstration for students to observe. It also involves a segment that requires the students consult other sources of information related to what they observed in making their hypothesis and planning their investigation. It also involves a group-learning segment, that can easily be adjusted to incorporate differentiated instruction to accommodate students with special needs, during which students conduct the investigation they planned. Finally, it also involves a segment that allows the students the opportunity to communicate the results of their investigation and to evaluate the results of investigations conducted by others. It may also involve another segment involving direct instruction of the components of the scientific method and practice opportunities for students to develop their understanding of these components if this is determined to be necessary based upon the results of the pre-lesson assessment.

Cannarella, Dustin

2011-10-01

178

Investigating Evolution with Living Plants.  

ERIC Educational Resources Information Center

Describes two investigative labs that use live plants to illustrate important biological principles, include quantitative analysis, and require very little equipment. Each lab is adaptable to a variety of class sizes, course contents, and student backgrounds. Topics include the evolution of flower size in Mimulus and pollination of Brassicas. (DDR)

Schlessman, Mark A.

1997-01-01

179

INVESTIGATION Global Population Genetic Structure  

E-print Network

INVESTIGATION Global Population Genetic Structure of Caenorhabditis remanei Reveals Incipient-wide population genetic processes for their outcrossing relatives, which represent the reproductive state species from China, C. sp. 23. We find high genetic variation globally and within each local population

Cutter, Asher D.

180

Investigating Earthquakes through Regional Seismicity  

NSDL National Science Digital Library

In this module, sudents will use online interactive materials to investigate the nature of earthquakes. The module consists of three major sections, "What is an Earthquake?", "The Distribution of Earthquakes", and "Measuring Earthquakes". Each section presents online material for background and interactive learning activities which help them to understand such characteristics of earthquakes as their associated faults, rates of occurrence, magnitudes, and geographic distribution.

Marquis, John; Hafner, Katrin; Hauksson, Egill

181

Investigation of protein structure determination  

E-print Network

Investigation of protein structure determination using X-ray free-electron lasers Dissertation zur sources, X-ray free-electron lasers (X- FEL's), several fields of research, including atomic and molecular Division in the Center for Free-electron Laser Science and graduate students of the Hamburg School

182

Visualizing Chemistry: Investigations for Teachers.  

ERIC Educational Resources Information Center

This book contains 101 investigations for chemistry classrooms. Topics include: (1) Physical Properties; (2) Reactions of Some Elements; (3) Reactions Involving Gases; (4) Energy Changes; (5) Solutions and Solubility; (6) Transition Metals and Complex Ions; (7) Kinetics and Equilibrium; (8) Acids and Bases; (9) Oxidation-Reduction; (10)…

Ealy, Julie B.; Ealy, James L., Jr.

183

The WIND magnetic field investigation  

Microsoft Academic Search

The magnetic field experiment on WIND will provide data for studies of a broad range of scales of structures and fluctuation characteristics of the interplanetary magnetic field throughout the mission, and, where appropriate, relate them to the statics and dynamics of the magnetosphere. The basic instrument of the Magnetic Field Investigation (MFI) is a boom-mounted dual triaxial fluxgate magnetometer and

R. P. Lepping; M. H. Ac?na; L. F. Burlaga; W. M. Farrell; J. A. Slavin; K. H. Schatten; F. Mariani; N. F. Ness; F. M. Neubauer; Y. C. Whang; J. B. Byrnes; R. S. Kennon; P. V. Panetta; J. Scheifele; E. M. Worley

1995-01-01

184

An Investigation of Milk Sugar.  

ERIC Educational Resources Information Center

Describes an experiment to identify lactose and estimate the concentration of lactose in a sample of milk. Gives a background of the investigation. Details the experimental method, results and calculations. Discusses the implications of the experiment to students. Suggests further experiments using the same technique used in "miniprojects." (CW)

Smith, Christopher A.; Dawson, Maureen M.

1987-01-01

185

An investigation of empennage buffeting  

NASA Technical Reports Server (NTRS)

Progress in the investigation of empennage buffeting in reviewed. In summary, the following tasks were accomplished: relevant literatures was reviewed; equations for calculating structural response were formulated; root-mean-square values of root bending moment for a 65-degree rigid delta wing were calculated and compared with data; and a water-tunnel test program for an F-18 model was completed.

Lan, C. E.; Lee, I. G.

1986-01-01

186

Investigating Biodiversity in your schoolyard  

NSDL National Science Digital Library

In this field lab students will investigate the biodiversity around their school. Students will perform a biodiversity count using transect line. The students will develop multiple hypotheses relating to biodiversity and propose additional procedures for studying, collecting and testing these questions.

187

Investigating University-School Partnerships  

ERIC Educational Resources Information Center

Investigating University-School Partnerships: A Volume in Professional Development School Research, the fourth book in the PDS Research Series developed by the same editors, includes a collection of organized papers that represent the best and latest examples of practitioner thinking, research, and program design and evaluation in the field at the…

Nath, Janice, Ed.; Guadarrama, Irma N., Ed.; Ramsey, John, Ed.

2011-01-01

188

The NEAR laser ranging investigation  

Microsoft Academic Search

The objective of the Near-Earth Asteroid Rendezvous (NEAR) laser ranging investigation is to obtain high integrity profiles and grids of topography for use in geophysical, geodetic and geological studies of asteroid 433 Eros. The NEAR laser rangefinder (NLR) will determine the slant range of the NEAR spacecraft to the asteroid surface by measuring precisely the round trip time of flight

M. T. Zuber; D. E. Smith; A. F. Cheng; T. D. Cole

1997-01-01

189

Investigational Drug Steering Committee Roster  

Cancer.gov

Investigational Drug Steering Committee Roster Co-chairs Lillian Siu, M.D.Princess Margaret HospitalUniversity of TorontoToronto, Ontario Amit Oza, M.D.Princess Margaret HospitalUniversity of TorontoToronto, Ontario Members Carol Aghajanian, M.D.Memorial

190

Investigating Gender Differences in Reading  

ERIC Educational Resources Information Center

Girls consistently outperform boys on tests of reading comprehension, although the reason for this is not clear. In this review, differences between boys and girls in areas relating to reading will be investigated as possible explanations for consistent gender differences in reading attainment. The review will examine gender differences within the…

Logan, Sarah; Johnston, Rhona

2010-01-01

191

The Galileo Plasma wave investigation  

Microsoft Academic Search

The purpose of the Galileo plasma wave investigation is to study plasma waves and radio emissions in the magnetosphere of Jupiter. The plasma wave instrument uses an electric dipole antenna to detect electric fields, and two search coil magnetic antennas to detect magnetic fields. The frequency range covered is 5 Hz to 5.6 MHz for electric fields and 5 Hz

D. A. Gurnett; W. S. Kurth; R. R. Shaw; A. Roux; R. Gendrin; C. F. Kennel; F. L. Scarf; S. D. Shawhan

1992-01-01

192

Stream velocity Investigation using Inquiry  

NSDL National Science Digital Library

This activity is a field investigation using science inquiry and problem solving, where small groups of students design their own experiment to determine stream velocity, collect and analyze their data, draw conclusions, and make further inferences based group discussion/collaboration.

193

Cold Fusion, A Journalistic Investigation  

Microsoft Academic Search

Author of the recent book, The Rebirth of Cold Fusion, and founder of New Energy Times, Steven B. Krivit presents a summary of cold fusion's, past, present and possible future. This talk will briefly review five highlights of the recent New Energy Times investigation into cold fusion research:1. Analysis of early studies that supposedly disproved cold fusion.2. Key early corroborations

Steven B. Krivit

2005-01-01

194

Scientific Investigation with the SJCSI  

NASA Astrophysics Data System (ADS)

Scientific Investigation with the SJCSI (Saint Jean* Crime Scene Investigation) Our work, which we have been teaching for 3 years, consists of a scientific investigation. We create a case from A to Z and then our students (15 to 16 years old) are meant to collect samples and clues from a reconstituted crime scene and then have to catch the culprit thanks to laboratory tests crossing four subjects: Physics and Chemistry, Biology, Math and English. I'm a biology teacher and I work with 3 other teachers in my school. The objectives of these activities are: • Make sciences more attractive by putting them into a context of crime investigation. • Use science techniques to find a culprit or to clear a suspect. • To acquire scientific knowledge. • Realize that the different scientific subjects complement each other to carry out a survey. • Use English language and improve it. The investigation consists of doing experiments after collecting different samples and clues on the crime scene. Examples of Biology experimentation: • Detecting the origin of the blood samples found on the crime scene. Students observe blood samples with a microscope and compare the characteristics to those of human blood found on the web. They discover that blood samples found aren't human blood because the red cells have a nucleus. By using the information given in the scenario, they discover that blood sample belongs to the parrot of a suspect. Students, also take a photo of their microscopic preparations, add title and caption and so they learn the cell's structure and the characteristics of blood cells. • In another case, students have to study the blood sample found under the victims fingernails. They observe blood preparation and compare it to the blood of a suspect who has a genetic disease: drepanocytosis. So, they discover the characteristics of blood cells by comparing them to sickle cells. • DNA electrophoresis to identify DNA found, for example, on the gun. • Blood type identification. They discover how blood types work, the different antigens in the plasma and antibodies on the red cells. In three years, we have solved 3 different cases. Here is the link to our website: https://sites.google.com/site/websvtberbey/mps---science-et-investigation-policiere *Saint Jean is the name of our secondary school.

Berbey, E.; Delpeyroux, G.; Douay, E.; Juchereau, C.; Garavet, O.

2012-04-01

195

Microstructural investigations on aerated concrete  

SciTech Connect

Aerated concrete is characterized by the presence of large voids deliberately included in its matrix to reduce the density. This study reports the investigations conducted on the structure of cement-based autoclaved aerated concrete (AAC) and non-AAC with sand or fly ash as the filler. The reasons for changes in compressive strength and drying shrinkage are explained with reference to the changes in the microstructure. Compositional analysis was carried out using XRD. It was observed that fly ash responds poorly to autoclaving. The process of pore refinement in fly ash mixes is discussed with reference to the formation of Hadley grains as well as fly ash hydration. The paste-void interface in aerated concrete investigated in relation to the paste-aggregate interface in normal concrete revealed the existence of an interfacial transition zone.

Narayanan, N.; Ramamurthy, K.

2000-03-01

196

ATMOS Spacelab 1 science investigation  

NASA Technical Reports Server (NTRS)

Existing infrared spectra from high speed interferometer balloon flights were analyzed and experimental analysis techniques applicable to similar data from the ATMOS experiment (Spacelab 3) were investigated. Specific techniques under investigation included line-by-line simulation of the spectra to aid in the identification of absorbing gases, simultaneous retrieval of pressure and temperature profiles using carefully chosen pairs of CO2 absorption lines, and the use of these pressures and temperatures in the retrieval of gas concentration profiles for many absorbing species. A search for a new absorption features was also carried out, and special attention was given to identification of absorbing gases in spectral bandpass regions to be measured by the halogen occultation experiment.

Park, J. H.; Smith, M. A. H.; Twitty, J. T.; Russell, J. M., III

1979-01-01

197

Combinatorial Investigations of Polymer Adhesion  

NSDL National Science Digital Library

In this work, we introduce a combinatorial technique that can be used to investigate adhesive interactions between a polymer and either another polymer, a ceramic, or a metal. The primary goal in the development of this technique is to design a high-throughput, parallel processing adhesion test that allows the adhesive strength dependence on multivariable environments to be determined. This combinatorial polymer adhesion test will provide qualitative and quantitative data used to determine absolute measures of adhesion as a function of the multidimensional parameter space. These results will aid industrial screening for optimal adhesives, as well as provide a unique tool for gaining a fundamental understanding of polymer adhesion. We investigate the temperature and thickness dependence of the self-adhesion of polystyrene (PS) and the adhesion between PS and poly(dimethylsiloxane) (PDMS) for demonstration of concept.

Crosby, Alfred; Karim, Alamgir; Amis, Eric

2001-01-01

198

Crop Science Investigation (CSI) Network  

NSDL National Science Digital Library

Crop Science Investigation (CSI) Network        This site is designed to serve as a clearinghouse of lesson plans and other materials useful for teaching 4-H and FFA youth about crop and soil sciences.  Check out this site for information to use in your classroom, workshops, or 4-H meetings.       As youth become less connected with agriculture, it is essential to teach them about agriculture. A series of workshops, called Crop Science Investigation or CSI was created to help spark the interest of youth to learn about crops and plants.Dig into some interesting facts about Nebraska crops.Learn how crops grow and factors that affect them.Learn about exciting career opportunities related to crop and plant science. The University of Nebraska offers great majors for anyone interested in anything plants!  Check it out!

199

Investigation of dynamic ground effect  

NASA Technical Reports Server (NTRS)

An experimental investigation of dynamic ground effect was conducted in the Univ. of Kansas wind tunnel using delta wings of 60, 70, 75 deg sweep; the XB-70 wing; and the F-104A wing. Both static and dynamic tests were made. Test data were compared to other test data, including dynamic flight test data of the XB-70 and F-104A. Limited flow visualization test were conducted. A significant dynamic effect was found for highly swept delta wings.

Chang, Ray Chung; Muirhead, Vincent U.

1987-01-01

200

Investigation of selected disk systems  

NASA Technical Reports Server (NTRS)

The large disk systems offered by IBM, UNIVAC, Digital Equipment Corporation, and Data General were examined. In particular, these disk systems were analyzed in terms of how well available operating systems take advantage of the respective disk controller's transfer rates, and to what degree all available data for optimizing disk usage is effectively employed. In the course of this analysis, generic functions and components of disk systems were defined and the capabilities of the surveyed disk system were investigated.

1976-01-01

201

Sea Turtle First Aid Investigation  

NSDL National Science Digital Library

This activity (located on page 4 of the PDF) is a full inquiry investigation into testing a repair material. Groups of learners perform âfirst aidâ on a cut orange, which represents propeller damage on the back of a leatherback sea turtle. Learners use a variety of repair materials and predict how well various treatments will work, then observe treated, untreated, and uncut control oranges for 4 days. Relates to linked video, DragonflyTV GPS: Sea Turtles.

Twin Cities Public Television, Inc.

2007-01-01

202

The Giotto magnetic field investigation  

Microsoft Academic Search

The Giotto spacecraft will carry sensors for investigating the interplanetary magnetic field while en route and the interaction between the solar wind magnetoplasma and Halley's Comet neutral gas outflow during close approach. Giotto will carry an outboard biaxial fluxgate system and inboard electronics. The instrumentation draws 1.2 kW and weighs 1.31 kg. Sampling rates will be 28\\/sec during close encounter,

F. M. Neubauer; G. Musmann; M. H. Acuna; L. F. Burlaga; N. F. Ness; F. Mariani; M. Wallis; E. Ungstrup; H. Schmidt

1983-01-01

203

Authorship Analysis in Cybercrime Investigation  

Microsoft Academic Search

Criminals have been using the Internet to distribute a wide range of illegal materials globally in an anonymous manner, making\\u000a criminal identity tracing difficult in the cybercrime investigation process. In this study we propose to adopt the authorship\\u000a analysis framework to automatically trace identities of cyber criminals through messages they post on the Internet. Under\\u000a this framework, three types of

Rong Zheng; Yi Qin; Zan Huang; Hsinchun Chen

2003-01-01

204

Systems special investigation group overview  

NASA Technical Reports Server (NTRS)

The Systems Special Investigation Group (SIG) has undertaken investigations in the four major engineering disciplines represented by LDEF hardware: electrical, mechanical, thermal, and optical systems. Testing was planned for the highest possible level of assembly, and top level system tests for nearly all systems were performed at this time. Testing to date was performed on a mix of LDEF and individual experimenter systems. No electrical or mechanical system level failures attributed to the spaceflight environment were detected by the Systems SIG. Some low cost electrical components were used successfully, although relays were a continuing problem. Extensive mechanical galling was observed, but no evidence of coldwelding was identified. A working index of observed systems anomalies was created and will be used to support the tracking and resolution of these effects. LDEF hardware currently available to the Systems SIG includes most of the LDEF facility systems hardware, and some significant experimenter hardware as well. A series of work packages was developed for each of several subsystem types where further testing is of critical interest. The Systems SIG is distributing a regular newsletter to the greater LDEF community in order to maintain coherence in an investigation which is widely scattered both in subject matter and in geography. Circulation of this informal document has quadrupled in its first year.

Mason, James B.; Dursch, Harry; Edelman, Joel

1992-01-01

205

32 CFR 637.6 - Customs investigations.  

...ENFORCEMENT AND CRIMINAL INVESTIGATIONS MILITARY POLICE INVESTIGATION Investigations § 637.6...notifications will be made to the military police and investigated by CID or the military police, as appropriate. (b) Military...

2014-07-01

206

32 CFR 637.6 - Customs investigations.  

Code of Federal Regulations, 2013 CFR

...ENFORCEMENT AND CRIMINAL INVESTIGATIONS MILITARY POLICE INVESTIGATION Investigations § 637.6...notifications will be made to the military police and investigated by CID or the military police, as appropriate. (b) Military...

2013-07-01

207

Simulation Study of GTO Based Static Transfer Switch Using MATLAB  

Microsoft Academic Search

This paper investigates the performance of GTO based STS systems in improving the power quality of sensitive three-phase RL load. Simulations are carried out to validate the use of GTO switches in medium voltage systems to achieve a lesser transfer time in network reconfiguration. Performance of STS system is demonstrated under various faults\\/disturbance conditions. Simulations are carried out using MATLAB

RAMESH PACHAR; HARPAL TIWARI; NIKITA JHAJHARIA; SIMRATH LAL SURANA

2007-01-01

208

Experimental analysis of DC and noise parameter degradation in n-channel reduced surface field (RESURF) LDMOS transistors  

Microsoft Academic Search

1\\/ƒ noise analysis is implemented as a quantitative measure for the dielectric \\/ silicon interface related reliability and degradation in RESURF lateral double-diffused MOS transistors. The effect of DC stress on 1\\/ƒ noise performance as well as on the location of stress induced degradation have been investigated with respect to stressing time in differently processed low and medium voltage LDMOS.

M. Iqbal Mahmud; Zeynep Celik-Butler; Xu Cheng; Weixiao Huang; Pinghai Hao; Purushothaman Srinivasan; Frank Hou; Benjamin L. Amey; Sameer Pendharkar

2012-01-01

209

New Digital Forensics Investigation Procedure Model  

Microsoft Academic Search

In this paper, we presented a new digital forensics investigation procedure model which is as follows: investigation preparation, classifying cyber crime and deciding investigation priority, investigating damaged (victim) digital crime scene, criminal profiling consultant and analysis, tracking suspects, investigating injurer digital crime scene, summoning suspect, additional investigation, writing criminal profiling, writing report.

Yong-Dal Shin; Cyber Police

2008-01-01

210

Iodine monofluoride discharge laser investigation  

SciTech Connect

The results of an experimental investigation to improve the performance of a discharge-pumped iodine monofluoride laser are reported. Lasing was observed at 478.7, 484.7, 490.7, and 496.5 nm. Electrical measurements of the discharge characteristics permitted the energy flow in the circuit to be followed and laser efficiencies to be calculated. Parametric studies of gas mixtures were carried out. By optimizing several parameters, single-pulse lasing energies greater than 50 mJ were obtained.

Harris, D.G.; Blauer, J.A.; Hurlock, S.C. (Rockwell International, Rocketdyne Division, Canoga Park, CA (USA))

1990-10-15

211

Mars Observer magnetic fields investigation  

NASA Technical Reports Server (NTRS)

The magnetic fields experiment designed for the Mars Observer mission will provide definitive measurements of the Martian magnetic field from the transition and mapping orbits planned for the Mars Observer. The paper describes the instruments (which include a classical magnetometer and an electron reflection magnetometer) and techniques designed to investigate the nature of the Martian magnetic field and the Mars-solar wind interaction, the mapping of crustal magnetic fields, and studies of the Martian ionosphere, which are activities included in the Mars Observer mission objectives. Attention is also given to the flight software incorporated in the on-board data processor, and the procedures of data processing and analysis.

Acuna, M. H.; Connerney, J. E. P.; Wasilewski, P.; Lin, R. P.; Anderson, K. A.; Carlson, C. W.; Mcfadden, J.; Curtis, D. W.; Reme, H.; Cros, A.

1992-01-01

212

Alkaline fuel cell performance investigation  

NASA Technical Reports Server (NTRS)

An exploratory experimental fuel cell test program was conducted to investigate the performance characteristics of alkaline laboratory research electrodes. The objective of this work was to establish the effect of temperature, pressure, and concentration upon performance and evaluate candidate cathode configurations having the potential for improved performance. The performance characterization tests provided data to empirically establish the effect of temperature, pressure, and concentration upon performance for cell temperatures up to 300 F and reactant pressures up to 200 psia. Evaluation of five gold alloy cathode catalysts revealed that three doped gold alloys had more that two times the surface areas of reference cathodes and therefore offered the best potential for improved performance.

Martin, R. E.; Manzo, M. A.

1988-01-01

213

Alkaline fuel cell performance investigation  

NASA Technical Reports Server (NTRS)

An exploratory experimental fuel cell test program was conducted to investigate the performance characteristics of alkaline laboratory research electrodes. The objective of this work was to establish the effect of temperature, pressure, and concentration upon performance and evaluate candidate cathode configurations having the potential for improved performance. The performance characterization tests provided data to empirically establish the effect of temperature, pressure, and concentration upon performance for cell temperatures up to 300 F and reactant pressures up to 200 psia. Evaluation of five gold alloy cathode catalysts revealed that three doped gold alloys had more than two times the surface areas of reference cathodes and therefore offered the best potential for improved performance.

Martin, R. E.; Manzo, M. A.

1988-01-01

214

Probeware Tools for Science Investigations  

NSDL National Science Digital Library

Probeware is the general term used for probes and software that can be used with microprocessors (computer, calculator, palm device, etc.) to make scientific measurements. The characteristics of rapid data collection, nearly instantaneous display of data in tabular or graphical form, analysis tools, and the ability to collect data consistently over long periods of time enable probeware to be one of the most important tools at the science teacher's disposal. A new world of possible student investigations opens up with the use of these tools.

Park, John C.

2008-01-01

215

Microgravity Science Glovebox Investigations SUBSA  

NASA Technical Reports Server (NTRS)

Solidification Using a Baffle in Sealed Ampoules (SUBSA) is a Microgravity Science Glovebox Investigation manifested for the UF2 flight, on the U.S. Orbiter 111, to the International Space Station (ISS). SUBSA complements the "parent" flight investigation CG13 (Space-and Groundbased Crystal Growth Using a Baffle). During directional solidification, the disk-shaped baffle acts as a partition, creating a small melt zone at the solid-liquid interface. As a result, the level of buoyancy-driven convection at the interface is significantly reduced. In space, the baffle will reduce convection driven by residual micro acceleration. The baffle reduces the Rayleigh number (Ra) of the melt by a factor of 103. The combined effect of the baffle and microgravity will yield a reduction in Ra by a factor of 107 to 109 approaching effectively the acceleration conditions in "nanogravity". The results of ground based tests and numerical modeling will be presented. The furnace for directional solidification (flight hardware and the ground unit) was developed by Tec-Masters Inc. The flight ampoules were produced jointly at Rensselaer, Tec-Masters Inc. and Crystallod Inc.

Ostrogorsky, A.; Marin, C.; Vogel, M.; Volz, M. P.; Luz, P.; Jeter, L.; Spivey, Reggie; Duffar, Thierry; Geveden, Rex D. (Technical Monitor)

2001-01-01

216

Investigating legal aspects of cyberbullying.  

PubMed

In the UK schools are required by law to protect students from bullying; the responsibility of teachers to govern such behaviour has been extended outside the school setting to include cyberbullying. In this investigation, cyberbullying in secondary education is explored from the student perspective using a qualitative method of enquiry. Reported awareness and understanding about the legal aspects of cyberbullying are investigated; consideration is given to legislation, cybercrime, children's rights, school sanctions and safeguarding responsibilities. A total of 197 male and female students aged between 11 and 14 years old participated. Despite the availability of information on guidelines and legislation at national, local, and school level, this does not appear to have reached ground level of the individual student. There is a considerable gap between what students should know and what they report to be aware of with regard to legal aspects of cyberbullying. To address concerns of keeping up with the pace of change in cyberbullying, a collaborative approach is required with young people and adults sharing expertise. PMID:23079364

Paul, Simone; Smith, Peter K; Blumberg, Herbert H

2012-11-01

217

Fundamental Investigations of Airframe Noise  

NASA Technical Reports Server (NTRS)

An extensive numerical and experimental study of airframe noise mechanisms associated with a subsonic high-lift system has been performed at NASA Langley Research Center (LaRC). Investigations involving both steady and unsteady computations and experiments on a small-scale, part-span flap model are presented. Both surface (steady and unsteady pressure measurements, hot films, oil flows, pressure sensitive paint) and off surface (5 hole-probe, particle-imaged velocimetry, laser velocimetry, laser light sheet measurements) were taken in the LaRC Quiet Flow Facility (QFF) and several hard-wall tunnels up to flight Reynolds number. Successful microphone array measurements were also taken providing both acoustic source maps on the model, and quantitative spectra. Critical directivity measurements were obtained in the QFF. NASA Langley unstructured and structured Reynolds- Averaged Navier-Stokes codes modeled the flap geometries excellent comparisons with surface and offsurface experimental data were obtained. Subsequently, these meanflow calculations were utilized in both linear stability and direct numerical simulations of the flap-edge flow field to calculate unsteady surface pressures and farfield acoustic spectra. Accurate calculations were critical in obtaining not only noise source characteristics, but shear layer correction data as well. Techniques utilized in these investigations as well as brief overviews of results will be given.

Macaraeg, M. G.

2004-01-01

218

Investigation of Heat Transfer From  

NASA Technical Reports Server (NTRS)

The convective heat transfer from the surface of an ellipsoidal forebody of fineness ratio 3 and 20-inch maximum diameter was investigated in clear air for both stationary and rotating operation over a range of conditions including air speeds up to 240 knots, rotational speeds up to 1200 rpm, and angles of attack of 0 deg, 3 deg, and 6 deg. The results are presented in the form of heat-transfer coefficients and the correlation of Nusselt and Reynolds numbers. Both a uniform surface temperature and a uniform input heater density distribution were used. The experimental results agree well with theoretical predictions for uniform surface temperature distribution. Complete agreement was not obtained with uniform input heat density in the laminar-flow region because of conduction effects. No significant effects of rotation were obtained over the range of airstream and rotational speeds investigated. Operation at angle of attack had only minor effects on the local heat transfer. Transition from laminar to turbulent heat transfer occurred over a wide range of Reynolds numbers. The location of transition depended primarily on surface roughness and pressure and temperature gradients. Limited transient heating data indicate that the variation of surface temperature with time followed closely an exponential relation.

Lewis, James P.; Ruggeri, Robert S.

1956-01-01

219

Investigation of ultraviolet interstellar extinction  

NASA Technical Reports Server (NTRS)

Results concerning interstellar extinction in the ultraviolet are reported. These results were initially obtained by using data from main-sequence stars and were extended to include supergiants and emission stars. The principal finding of the analysis of ultraviolet extinction is not only that it is wavelength dependent, but that if changes with galactic longitude in the U3 passband (lambda sub eff = 1621 A); it does not change significantly in the U2 passband (lambda sub eff = 2308 A). Where data are available in the U4 passband (lambda sub eff = 1537 A), they confirm the rapid rise of extinction in the ultraviolet found by other investigators. However, in all cases, emission stars must be used with great caution. It is important to realize that while extinction continues to rise toward shorter wavelengths in the ultraviolet, including the shortest ultraviolet wavelengths measured (1100 A), it no longer plays an important role in the X-ray region (50 A).

Payne, C.; Haramundanis, K. L.

1973-01-01

220

NMR investigation of Ag nanoparticles  

NASA Astrophysics Data System (ADS)

109Ag nuclear magnetic resonance (NMR) and relaxation measurements have been performed on two powder samples of Ag nanoparticles with average sizes of 20 nm and 80 nm. The measurements have been done in an external field of 9.4 T and in the temperature range 10 K < T < 280 K. The 109Ag NMR spectra for both samples have close to Lorentzian shapes and turn out to be mixtures of homogeneous and inhomogeneous lines. The linewidth ? ? at room temperature is 1.3 kHz for both samples and gradually increases with decreasing temperature. Both the Knight shift ( K) and the nuclear spin-lattice relaxation rate (1/ T 1) are observed to be almost identical to the values reported for the bulk Ag metal, whereby the Korringa ratio R(= K 2 T 1 T/S) is found to be 2.0 for both samples in the investigated temperature range.

Son, Kwanghyo; Jang, Zeehoon

2013-01-01

221

Anthropoecological investigations in Central Asia.  

PubMed

The results of anthropoecological investigations in Central Asia are described. From 1976 to 1991 about 6,000 individuals of both sexes were examined. 2,500 of them were children from 7 to 17 years. The program included the study of body build, metabolic rates, genetic markers and demographic structures. Different groups of Tuvins, Khakass, Mountain and Abakan Shortsys, Altai-kijis, Telengits, Teleuts, Kazakhs, and several groups of Mongols and Khotons were studied. It was shown that some patterns of body build and physiological traits of native populations of Central Asia partly reflect the influence of the geographical environment. The differences observed between various populations of the region may be explained by ecological reasons and not only by ethnic differentiation. PMID:16079568

Alexeeva, Tatyana I

2005-07-01

222

The Giotto magnetic field investigation  

NASA Technical Reports Server (NTRS)

The Giotto spacecraft will carry sensors for investigating the interplanetary magnetic field while en route and the interaction between the solar wind magnetoplasma and Halley's Comet neutral gas outflow during close approach. Giotto will carry an outboard biaxial fluxgate system and inboard electronics. The instrumentation draws 1.2 kW and weighs 1.31 kg. Sampling rates will be 28/sec during close encounter, covering selectable ranges from 16 nT to 65,535 nT. In-flight calibration techniques are under development to ensure magnetic cleanliness will be obtained. Measurements are also planned of the inbound bow shock, the magnetosheath and the cometary ionopause. The data will be collected as close as 1000 km from the comet surface.

Neubauer, F. M.; Musmann, G.; Acuna, M. H.; Burlaga, L. F.; Ness, N. F.; Mariani, F.; Wallis, M.; Ungstrup, E.; Schmidt, H.

1983-01-01

223

(Structural investigation of curium bismuthide)  

SciTech Connect

The primary objective of the collaborative studies with EITU was to study curium bismuthide using energy dispersive X-ray diffraction to monitor its structure as a function of pressure. This objective was accomplished and the material was investigated up to 0.48 megabars of pressure. These studies were a continuation of established and productive collaborations between ORNL and EITU. The study of this curium compound is significant in that it is the first 5f-element bismuthide to be studied under pressure. Bismuth has the highest Z and the largest radius of the pnictogen group of elements (important for Hill Plot assessments) and has the greatest potential to form f-p type bonding with actinides under pressure. From a preliminary assessment of our experimental data it has been determined that two structural transitions occurred in the curium bismuthide sample as a result of the applied pressure.

Haire, R.G.

1990-10-12

224

Selling Complementary Patents: Experimental Investigation  

SciTech Connect

Production requiring licensing groups of complementary patents implements a coordination game among patent holders, who can price patents by choosing among combinations of fixed and royalty fees. Summed across patents, these fees become the total producer cost of the package of patents. Royalties, because they function as excise taxes, add to marginal costs, resulting in higher prices and reduced quantities of the downstream product and lower payoffs to the patent holders. Using fixed fees eliminates this inefficiency but yields a more complex coordination game in which there are multiple equilibria, which are very fragile in that small mistakes can lead the downstream firm to not license the technology, resulting in inefficient outcomes. We report on a laboratory market investigation of the efficiency effects of coordinated pricing of patents in a patent pool. We find that pool-like pricing agreements can yield fewer coordination failures in the pricing of complementary patents.

Bjornstad, David J [ORNL; Santore, Rudy [University of Tennessee; McKee, Michael [University of Tennessee

2010-02-01

225

Investigative modalities in infectious keratitis.  

PubMed

Standard recommended guidelines for diagnosis of infectious keratitis do exist. Based on an extensive Medline literature search, the various investigative modalities available for aiding the diagnosis of microbial keratitis have been reviewed and described briefly. Preferred practice patterns have been outlined and the importance of routine pre-treatment cultures in the primary management of infectious keratitis has been highlighted. Corneal scraping, tear samples and corneal biopsy are few of the specimens needed to carry out the investigative procedures for diagnosis and for initiating therapy in cases of microbial keratitis. In bacterial, fungal and amoebic keratitis, microscopic examination of smears is essential for rapid diagnosis. Potassium hydroxide (KOH) wet mount, Gram's stain and Giemsa stain are widely used and are important for clinicians to start empirical therapy before microbial culture results are available. The usefulness of performing corneal cultures in all cases of suspected infectious keratitis has been well established. In cases of suspected viral keratitis, therapy can be initiated on clinical judgment alone. If a viral culture is needed, scrapings should directly be inoculated into the viral transport media. In vivo confocal microscopy is a useful adjunct to slit lamp bio-microscopy for supplementing diagnosis in most cases and establishing early diagnosis in many cases of non-responding fungal and amoebic keratitis. This is a non-invasive, high resolution technique which allows rapid detection of Acanthamoeba cysts and trophozoites and fungal hyphae in the cornea long before laboratory cultures give conclusive results. Other new modalities for detection of microbial keratitis include molecular diagnostic techniques like polymerase chain reaction, and genetic finger printing by pulsed field gel electrophoresis. PMID:18417821

Gupta, Noopur; Tandon, Radhika

2008-01-01

226

Spectroscopic investigation of protein corona  

NASA Astrophysics Data System (ADS)

Nanotechnology has revolutionalized the landscape of modern science and technology, including materials, electronics, therapeutics, bioimaging, sensing, and the environment. Research in the past decade has examined the fate of nanomaterials in vitro and in vivo, as well as the interactions between nanoparticles and biological and ecosystems using primarily toxicological and ecotoxicological approaches. However, due to the versatility in the physical and physicochemical properties of nanoparticles, and due to the vast complexity of their hosting systems, the solubility, transformation, and biocompatibility of nanomaterials are still poorly understood. Nanotechnology has been undergoing tremendous development in recent decades, driven by realized perceived applications of nanomaterials in electronics, therapeutics, imaging, sensing, environmental remediation, and consumer products. Nanoparticles on entering the blood stream undergo an identity change, they become coated with proteins. There are different kind of proteins present in blood. Proteins compete for getting coated over the surface of nanoparticle and this whole entity of proteins coated over nanoparticle surface is called Protein Corona. Proteins tightly bound to the surface of nanoparticle form hard corona and the ones loosely bound on the outer surface form soft corona. This dissertation is aimed at spectroscopic investigation of Protein Corona. Chapter I of this dissertation offers a comprehensive review of the literature based on nanomaterials with the focus on carbon based nanomaterilas and introduction to Protein Corona. Chapter II is based different methods used for Graphene Synthesis,different types of defects and doping. In Chapter III influence of defects on Graphene Protein Corona was investigated. Chapter IV is based on the study of Apoptosis induced cell death by Gold and silver nanoparticles. In vitro study of effect of Protein Corona on toxicity of cells was done.

Choudhary, Poonam

227

AP Biology Investigation #6: Cellular Respiration  

NSDL National Science Digital Library

This is the Advanced Placement Investigation into cellular respiration (#6). The investigation was developed by the College Board for use in AP Biology classes. Students begin by investigating the question, What factors affect the rate of cellular respiration in multicellular organisms? Later, students investigate one of their own questions that arose during the first investigation. Wisconsin Fast Plants are used as a model organism.

Approach, Ap B.

228

45 CFR 1156.17 - Investigation.  

Code of Federal Regulations, 2010 CFR

...THE ARTS AND THE HUMANITIES NATIONAL ENDOWMENT FOR THE ARTS NONDISCRIMINATION ON THE...Informal investigation. (1) The Endowment will investigate complaints that are...part of the initial investigation, the Endowment will use informal...

2010-10-01

229

45 CFR 1156.17 - Investigation.  

Code of Federal Regulations, 2012 CFR

...THE ARTS AND THE HUMANITIES NATIONAL ENDOWMENT FOR THE ARTS NONDISCRIMINATION ON THE...Informal investigation. (1) The Endowment will investigate complaints that are...part of the initial investigation, the Endowment will use informal...

2012-10-01

230

45 CFR 1156.17 - Investigation.  

Code of Federal Regulations, 2013 CFR

...THE ARTS AND THE HUMANITIES NATIONAL ENDOWMENT FOR THE ARTS NONDISCRIMINATION ON THE...Informal investigation. (1) The Endowment will investigate complaints that are...part of the initial investigation, the Endowment will use informal...

2013-10-01

231

49 CFR 659.35 - Investigations.  

Code of Federal Regulations, 2010 CFR

...Each investigation must be documented in a final report that includes a description of investigation activities, identified causal and contributing factors, and a corrective action plan. (e) A final investigation report must be formally adopted by...

2010-10-01

232

Investigation of serendipitious WFC sources  

NASA Technical Reports Server (NTRS)

The serendipitious WFC sources under investigation, i.e., those which just happened to lie in the field of view while another object was being studied, were disappointing. The integration times were chosen to suit the primary target not the serendipitous targets. UX UMa, CZ Ori, BI Ori, WX Cet and AR And were not detected. A long (approximately 17 ksec) pointed observation of UX Uma (PI Wood) has since been carried out (February 1993) and the data is expected shortly. The other observations were much more successful. V471 Tau was observed with the WFC for 6.5 hrs with the S1 filter and 1.1 hrs with the S2b filter. It was easily detected with a count rate of 0.03 cps in the S1 filter and 0.15 cps in the S2b filter. The oscillations were seen, even before the data was folded, as was expected from preliminary results from the survey (Barstow et al. 1992). The pointed observations provide a much better phase coverage of the oscillations than did the survey data where the coverage was sparse. These data will be presented in a paper with the PSPC data (PI's Robinson and Shipman) and the pulse profiles in the different wavelengths will be compared.

Robinson, Edward L.

1993-01-01

233

Student Investigations of Tropospheric Ozone  

NASA Astrophysics Data System (ADS)

Hands-on field work and data collection have been shown to be a major factor in motivating students in the study of geoscience and environmental science. An existing high-altitude balloon program at Medgar Evers College(MEC) has developed a new student research initiative focused on tropospheric ozone profile investigations. This effort was launched with involvement in the Ozonesonde Network Study (IONS) 2006 campaign of coordinated observations organized by the Goddard Space Flight Center (GSFC). The participation was stimulated by a collaboration between faculty at the University of Rhode Island (URI) and faculty at Medgar Evers College, a minority-serving institution. URI provided training, background material, access to lab facilities and continues to assist faculty at MEC in the engagement of minority students in this research experience. Undergraduate and graduate students are involved in all phases of the ozone study including ozonesonde preparation and calibration (URI), launch and communications (Paradox, NY), and data analysis (Medgar Evers College) which is being incorporated into selected courses in Environmental Science, Physical Science and Computer Science. A companion educational project involved high school students with a teacher-mentor in surface ozone measurements using the GLOBE protocol as well as linkages with the ozone profile study. This presentation describes the student-based participation, the URI-MEC collaboration, results from the ozone profiles as well as the details of ongoing curriculum integration and future work. The project is partially supported by the NASA Aura Education and Public Outreach program.

Austin, S.; Johnson, L.; Merrill, J.; Johnson, R.; Renee, B.; Fortney, M.; Renee, D.

2006-12-01

234

Supercritical waste oxidation pump investigation  

SciTech Connect

This report investigates the pumping techniques and pumping equipment that would be appropriate for a 5,000 gallon per day supercritical water oxidation waste disposal facility. The pumps must boost water, waste, and additives from atmospheric pressure to approximately 27.6 MPa (4,000 psia). The required flow ranges from 10 gpm to less than 0.1 gpm. For the higher flows, many commercial piston pumps are available. These pumps have packing and check-valves that will require periodic maintenance; probably at 2 to 6 month intervals. Several commercial diaphragm pumps were also discovered that could pump the higher flow rates. Diaphragm pumps have the advantage of not requiring dynamic seals. For the lower flows associated with the waste and additive materials, commercial diaphragm pumps. are available. Difficult to pump materials that are sticky, radioactive, or contain solids, could be injected with an accumulator using an inert gas as the driving mechanism. The information presented in this report serves as a spring board for trade studies and the development of equipment specifications.

Thurston, G.; Garcia, K.

1993-02-01

235

Combinatorial Investigations of Interfacial Failure  

NSDL National Science Digital Library

Conventional measurements of interfacial strength focus on a single variable, whereas many variables couple nontrivially and simultaneously to deï¬ne this property. We present a combinatorial methodology that allows the effects of multivariable environments on interfacial strength to be investigated in a high-throughput, parallel, and quantitative manner. This technique is largely based on the theory of Johnson, Kendall, and Roberts that quantiï¬es adhesion through the contact and separation of a spherical lens and ï¬at substrate. For our experiments, we fabricated a combinatorial library consisting of a two-dimensional array of spherical caps and a complementary substrate. The array of spherical caps was brought into contact and subsequently separated from the substrate, whereas the relative displacement and contact area of the individual lenses were recorded. With gradient library-fabrication methods, two adhesion-controlling parameters can be continuously varied along the orthogonal axes of the array. In this manner, each lens quantiï¬es the interfacial strength at a unique point in parameter space. We demonstrate this multilens contactadhesion test by measuring the effect of temperature and coating thickness on the self-adhesion of polystyrene thin ï¬lms. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 41: 883â891, 2003

Crosby, Alfred; Karim, Alamgir

2003-01-01

236

Laboratory Investigations on Percussive Drilling  

NASA Astrophysics Data System (ADS)

The laboratory investigation was carried out on ten rock samples using pneumatic drill with drill bits of different diameters. In general, the process of drilling always produces sound. Sound is generated from the bit-rock interface regardless of the material of the bit used in drilling. The predicted sound level and penetration rate are a product of the drill power and the physical properties of the rocks penetrated. Rock samples were collected from the field and physical properties of the rocks were determined in the laboratory. The sound level and penetration rates were correlated with the rock properties. The compressive strength and abrasivity exhibit strong correlations with the sound level and penetration rate. It was concluded that, among the rock properties included in this study, the compressive strength and abrasivity values are the dominant ones affecting the penetration rate and sound level of percussive drills. Though ten rock samples have been covered in this study, detailed analysis of only one of them is presented.

Kivade, S. B.; Murthy, Ch. S. N.; Vardhan, Harsha

2013-10-01

237

Investigations of Arcjet Flow Thermochemistry  

NASA Technical Reports Server (NTRS)

An experimental and numerical investigation of the thermochemical state of arcjet flows is currently being conducted at NASA Ames Research Center. The experimental approach relies on the use of laser- and emission-spectroscopic diagnostic techniques in three regions of the flow. A fiber optic sensor is used to record spectrally resolved emission signals from the electrode package region, where the flow is most likely to be in thermochemical equilibrium. A second emission diagnostic measurement is made in the shock layer formed over a blunt-body test article placed in the stream, and a CCD camera is used to simultaneously record spectral emission from several measurement locations along the stagnation streamline. Downstream of the nozzle exit, but upstream of the test article, Laser-Induced Fluorescence (LIF) of atomic nitrogen is used to assess the nonequilibrium distribution of flow enthalpy in the free stream. Results from the measurements are compared with predictions from a two-temperature, axisymmetric flow model that solves the nozzle and shock-layer flows.

Fletcher, Douglas G.; Wercinski, Paul (Technical Monitor)

1997-01-01

238

Weak lensing and cosmological investigation  

NASA Astrophysics Data System (ADS)

In the last few years the scientific community has been dealing with the challenging issue of identifying the dark energy component. We regard weak gravitational lensing as a brand new, and extremely important, tool for cosmological investigation in this field. In fact, the features imprinted on the Cosmic Microwave Background radiation by the lensing from the intervening distribution of matter represent a pretty unbiased estimator, and can thus be used for putting constraints on different dark energy models. This is true in particular for the magnetic-type B-modes of CMB polarization, whose unlensed spectrum at large multipoles (l ~= 1000) is very small even in presence of an amount of gravitational waves as large as currently allowed by the experiments: therefore, on these scales the lensing phenomenon is the only responsible for the observed power, and this signal turns out to be a faithful tracer of the dark energy dynamics. We first recall the formal apparatus of the weak lensing in extended theories of gravity, introducing the physical observables suitable to cast the bridge between lensing and cosmology, and then evaluate the amplitude of the expected effect in the particular case of a Non-Minimally-Coupled model, featuring a quadratic coupling between quintessence and Ricci scalar.

Acquaviva, Viviana

2005-03-01

239

Investigating a Magnetospheric Heat Cycle  

NASA Astrophysics Data System (ADS)

Rymer et al. [2008] described a radial heating cycle that operates in the inner, predominantly dipolar, magnetospheric region at Saturn. One particular element of the circulation was not well understood: the high temperature of plasma in the middle magnetosphere. So we were left with a mystery - what heats plasma in the middle magnetosphere? The same question at Jupiter has remained unanswered since the Voyager era [e.g. Hill et al., 1983]. To address this mystery we investigate an azimuthal heating cycle that might operate in the middle, non-dipolar magnetospheric region. This idea was first proposed as a mechanism to energise outer magnetospheric charged particles at Jupiter by Goertz [1978]. In this cycle "magnetic pumping" energises plasma by azimuthal transport in magnetic field configurations which are compressed at some local times (e.g. the dayside magnetosphere) and stretched at others (e.g. the tail-like nightside magnetosphere). Our hypothesis is that these two cycles (radial and azimuthal) operate in concert at Saturn and in any rapidly rotating magnetosphere. Both processes make distinctive predictions for the plasma pitch angle and energy distributions which we test using Cassini electron data at Saturn.

Rymer, A. M.; Livi, R.; Mauk, B. H.; Hill, T. W.

2012-12-01

240

Raman investigation of diamond films  

SciTech Connect

Extensive Raman investigations were conducted on a wide range of diamond films whose structures were dilineated by optical and confocal microscopy. The Raman Spectra from one extreme of this range indicates a very intense 1331 cm{sup {minus}1} line diagnostic of bulk crystalline diamond. Microscopy of the corresponding film shows the presence of many large true diamond crystallite. The 1331 cm{sup {minus}1} Raman line at the other extreme of the range, however, is virtually absent. It is replaced, at this extreme, by a very broad Raman contour whose maxima occur near 1355 cm{sup {minus}1} and 1575 cm{sup {minus}1}. Optical microscopy now reveals a complete lack of diamond crystallites. The ratio of the integrated Raman intensity of the 1331 cm{sup {minus}1} diamond line to the integral of the entire broad contour extending from {approx}1200 cm{sup {minus}1} to 1800 cm{sup {minus}1}, with maxima near 1355 cm{sup {minus}1} and 1575 cm{sup {minus}1}, was determined. This ratio rises with increasing diamond crystallite size, and it decreases as true diamond crystallites are replaced by diamond-like, but amorphous, hard carbon, which produces the broad Raman contour. The measured intensity ratio was analyzed in terms of a differential equation related to phonon coupling. The increase of the intensity ratio of the 1331 cm{sup {minus}1} diagnostic diamond peak is due to phono-phonon coupling between the diamond crystallites, as the concentration of the amorphous diamond-like carbon decreases. Confocal microscopy indicates many amorphous-like regions interspersed between diamond crystallites which account for the intensity loss, and agree with the Raman intensity measurements. These Raman measurements crystallinity versus amorphous hard-carbon character of thin diamond film.

Feng, Li-Ming

1993-12-31

241

Field investigation of keyblock stability  

SciTech Connect

Discontinuities in a rock mass can intersect an excavation surface to form discrete blocks (keyblocks) which can be unstable. This engineering problem is divided into two parts: block identification, and evaluation of block stability. One stable keyblock and thirteen fallen keyblocks were observed in field investigations at the Nevada Test Site. Nine blocks were measured in detail sufficient to allow back-analysis of their stability. Measurements included block geometry, and discontinuity roughness and compressive strength. Back-analysis correctly predicted stability or failure in all but two cases. These two exceptions involved situations that violated the stress assumptions of the stability calculations. Keyblock faces correlated well with known joint set orientations. The effect of tunnel orientation on keyblock frequency was apparent. Back-analysis of physical models successfully predicted block pullout force for two-dimensional models of unit thickness. Two-dimensional (2D) and three-dimensional (3D) analytic models for the stability of simple pyramidal keyblocks were examined. Calculated stability is greater for 3D analyses than for 2D analyses. Calculated keyblock stability increases with larger in situ stress magnitudes, larger lateral stress ratios, and larger shear strengths. Discontinuity stiffness controls block displacement more strongly than it does stability itself. Large keyblocks are less stable than small ones, and stability increases as blocks become more slender. Rock mass temperature decreases reduce the confining stress magnitudes and can lead to failure. The pattern of stresses affecting each block face explains conceptually the occurrence of pyramidal keyblocks that are truncated near their apex.

Yow, J.L. Jr.

1985-04-01

242

Athena Mars rover science investigation  

USGS Publications Warehouse

Each Mars Exploration Rover carries an integrated suite of scientific instruments and tools called the Athena science payload. The primary objective of the Athena science investigation is to explore two sites on the Martian surface where water may once have been present, and to assess past environmental conditions at those sites and their suitability for life. The remote sensing portion of the payload uses a mast called the Pancam Mast Assembly (PMA) that provides pointing for two instruments: the Panoramic Camera (Pancam), and the Miniature Thermal Emission Spectrometer (Mini-TES). Pancam provides high-resolution, color, stereo imaging, while Mini-TES provides spectral cubes at mid-infrared wavelengths. For in-situ study, a five degree-of-freedom arm called the Instrument Deployment Device (IDD) carries four more tools: a Microscopic Imager (MI) for close-up imaging, an Alpha Particle X-Ray Spectrometer (APXS) for elemental chemistry, a Mo??ssbauer Spectrometer (MB) for the mineralogy of Fe-bearing materials, and a Rock Abrasion Tool (RAT) for removing dusty and weathered surfaces and exposing fresh rock underneath. The payload also includes magnets that allow the instruments to study the composition of magnetic Martian materials. All of the Athena instruments have undergone extensive calibration, both individually and using a set of geologic reference materials that are being measured with all the instruments. Using a MER-like rover and payload in a number of field settings, we have devised operations processes that will enable us to use the MER rovers to formulate and test scientific hypotheses concerning past environmental conditions and habitability at the landing sites. Copyright 2003 by the American Geophysical Union.

Squyres, S.W.; Arvidson, R.E.; Baumgartner, E.T.; Bell, J.F., III; Christensen, P.R.; Gorevan, S.; Herkenhoff, K.E.; Klingelhofer, G.; Madsen, M.B.; Morris, R.V.; Rieder, R.; Romero, R.A.

2003-01-01

243

Tribochemical investigation of microelectronic materials  

NASA Astrophysics Data System (ADS)

To achieve efficient planarization with reduced device dimensions in integrated circuits, a better understanding of the physics, chemistry, and the complex interplay involved in chemical mechanical planarization (CMP) is needed. The CMP process takes place at the interface of the pad and wafer in the presence of the fluid slurry medium. The hardness of Cu is significantly less than the slurry abrasive particles which are usually alumina or silica. It has been accepted that a surface layer can protect the Cu surface from scratching during CMP. Four competing mechanisms in materials removal have been reported: the chemical dissolution of Cu, the mechanical removal through slurry abrasives, the formation of thin layer of Cu oxide and the sweeping surface material by slurry flow. Despite the previous investigation of Cu removal, the electrochemical properties of Cu surface layer is yet to be understood. The motivation of this research was to understand the fundamental aspects of removal mechanisms in terms of electrochemical interactions, chemical dissolution, mechanical wear, and factors affecting planarization. Since one of the major requirements in CMP is to have a high surface finish, i.e., low surface roughness, optimization of the surface finish in reference to various parameters was emphasized. Three approaches were used in this research: in situ measurement of material removal, exploration of the electropotential activation and passivation at the copper surface and modeling of the synergistic electrochemical-mechanical interactions on the copper surface. In this research, copper polishing experiments were conducted using a table top tribometer. A potentiostat was coupled with this tribometer. This combination enabled the evaluation of important variables such as applied pressure, polishing speed, slurry chemistry, pH, materials, and applied DC potential. Experiments were designed to understand the combined and individual effect of electrochemical interactions as well as mechanical impact during polishing. Extensive surface characterization was performed with AFM, SEM, TEM and XPS. An innovative method for direct material removal measurement on the nanometer scale was developed and used. Experimental observations were compared with the theoretically calculated material removal rate values. The synergistic effect of all of the components of the process, which result in a better quality surface finish was quantitatively evaluated for the first time. Impressed potential during CMP proved to be a controlling parameter in the material removal mechanism. Using the experimental results, a model was developed, which provided a practical insight into the CMP process. The research is expected to help with electrochemical material removal in copper planarization with low-k dielectrics.

Kulkarni, Milind Sudhakar

244

Getting Physical with the Digital Investigation Process  

Microsoft Academic Search

In this paper, a process model for digital investigations is defined using the theories and techniques from the physical investigation world. While digital investigations have recently become more common, physical investigations have existed for thousands of years and the experience from them can be applied to the digital world. This paper introduces the notion of a digital crime scene with

Brian D. Carrier; Eugene H. Spafford

2003-01-01

245

Policy and Guidelines for Investigational Agent Distribution  

Cancer.gov

The Division of Cancer Prevention (DCP) provides investigational agents for use in DCP approved protocols to participating investigators with a current signed FDA 1572 (MS Word doc) on file with DCP. Orders will only be shipped to the shipping address indicated on the investigator’s FDA form 1572.

246

Investigating Reaction-Driven Cracking  

NASA Astrophysics Data System (ADS)

Many metamorphic reactions lead to large volume changes, and potentially to reaction-driven cracking [1,2]. Large-scale hydration of mantle peridotite to produce serpentine or talc is invoked to explain the rheology of plate boundaries, the nature of earthquakes, and the seismic properties of slow-spread ocean crust and the 'mantle wedge' above subduction zones. Carbonation of peridotite may be an important sink in the global carbon cycle. Zones of 100% magnesite + quartz replacing peridotite, up to 200 m thick, formed where oceanic mantle was thrust over carbonate-bearing metasediments in Oman. Talc + carbonate is an important component of the matrix in subduction mélanges at Santa Catalina Island , California, and the Sanbagawa metamorphic belt, Japan. Engineered systems to emulate natural mineral carbonation could provide relatively inexpensive CO2 capture and storage [3]. More generally, engineered reaction-driven cracking could supplement or replace hydraulic fracture in geothermal systems, solution mining, and extraction of tight oil and gas. The controls on reaction-driven cracking are poorly understood. Hydration and carbonation reactions can be self-limiting, since they potentially reduce permeability and armor reactive surfaces [4]. Also, in some cases, hydration or carbonation may take place at constant volume. Small changes in volume due to precipitation of solid products increases stress, destabilizing solid reactants, until precipitation and dissolution rates become equal at a steady state stress [5]. In a third case, volume change due to precipitation of solid products causes brittle failure. This has been invoked on qualitative grounds to explain, e.g., complete serpentinization of mantle peridotite [6]. Below ~ 300°C, the available potential energy for hydration and carbonation of olivine could produce stresses of 100's of MPa [2], sufficient to fracture rocks to 10 km depth or more, causing brittle failure below the steady state stress required for constant volume replacement. Natural examples have fracture energy densities due to strain energy density of 100's of MPa [2]. Despite theory and observation, until now lab experiments on peridotite hydration and carbonation have not produced reaction-driven cracking. Slow kinetics and limited reactive surface area in low porosity samples may be the cause. Also, maximum stress may be limited by 'disjoining pressure', above which nano-films along grain boundaries collapse, and crystal growth essentially ceases [7]. To address these issues, we've begun experiments on analog materials with fast reaction rates, e.g., CaO + H2O = Ca(OH)2, to efficiently investigate the role of confining pressure and other factors on reaction-driven fracture events. Intriguingly, commercially available 'demolition mortar', largely CaO, produces stresses of 70 MPa or more around 1 inch bore holes at room T and P [8], even though there is a free surface at the top of the borehole, and hydration in a 'closed' system creates ~ 40% air-filled pore space. [1] Jamtveit et al EPSL 08 [2] Kelemen & Hirth EPSL 12 [3] Kelemen et al AREPS 11 [4] Aharonov et al JGR 98 [5] Fletcher & Merino GCA 01 [6] Macdonald & Fyfe T'phys 85 [7] Espinosa-Marzal & Scherer GSL Special Papers 10 [8] Laefer et al Mag Concrete Res 10

Kelemen, P. B.; Hirth, G.; Savage, H. M.

2013-12-01

247

47 CFR 3.70 - Investigations.  

Code of Federal Regulations, 2011 CFR

...COMMISSION GENERAL AUTHORIZATION AND ADMINISTRATION OF ACCOUNTING AUTHORITIES IN MARITIME AND MARITIME MOBILE-SATELLITE RADIO SERVICES Enforcement § 3.70 Investigations. The Commission may investigate any complaints made against...

2011-10-01

248

47 CFR 3.70 - Investigations.  

Code of Federal Regulations, 2013 CFR

...COMMISSION GENERAL AUTHORIZATION AND ADMINISTRATION OF ACCOUNTING AUTHORITIES IN MARITIME AND MARITIME MOBILE-SATELLITE RADIO SERVICES Enforcement § 3.70 Investigations. The Commission may investigate any complaints made against...

2013-10-01

249

47 CFR 3.70 - Investigations.  

Code of Federal Regulations, 2012 CFR

...COMMISSION GENERAL AUTHORIZATION AND ADMINISTRATION OF ACCOUNTING AUTHORITIES IN MARITIME AND MARITIME MOBILE-SATELLITE RADIO SERVICES Enforcement § 3.70 Investigations. The Commission may investigate any complaints made against...

2012-10-01

250

47 CFR 3.70 - Investigations.  

Code of Federal Regulations, 2010 CFR

...COMMISSION GENERAL AUTHORIZATION AND ADMINISTRATION OF ACCOUNTING AUTHORITIES IN MARITIME AND MARITIME MOBILE-SATELLITE RADIO SERVICES Enforcement § 3.70 Investigations. The Commission may investigate any complaints made against...

2010-10-01

251

25 CFR 556.4 - Background investigations.  

...INVESTIGATIONS FOR PRIMARY MANAGEMENT OFFICIALS AND KEY EMPLOYEES...investigation for each primary management official and for each key...request from each primary management official and from each key...chapter. (b) If, in the course of a background...

2014-04-01

252

Kinesthetic Investigations in the Physics Classroom  

ERIC Educational Resources Information Center

Creating investigations that allow students to see physics in their everyday world and to be kinesthetically active outside of the traditional physics classroom can be incredibly engaging and effective. The investigations we developed were inquiry investigations in which students engaged in concrete experiences before we discussed the abstract…

Whitworth, Brooke A.; Chiu, Jennifer L.; Bell, Randy L.

2014-01-01

253

Investigational Drug/Device Accountability Policy Introduction  

E-print Network

2/11/08 Investigational Drug/Device Accountability Policy Introduction: Good clinical research investigational drug or device used in a research trial at Washington University. This is true whether the study-initiated trial using department funds. Our institutional responsibility requires that any investigational drug

Subramanian, Venkat

254

BIM Anatomy An investigation into implementation prerequisites  

E-print Network

BIM Anatomy An investigation into implementation prerequisites Martin Hooper #12;BIM Anatomy Title: BIM Anatomy An investigation into implementation prerequisites Published: 2012 Design SE221 00 Lund Sweden Tel: +46 (0)46 222 48 63 #12;BIM Anatomy: An investigation

255

Integrating the Sciences to Investigate Groundwater Pollution  

ERIC Educational Resources Information Center

Investigations that integrate concepts from geological sciences with biology and chemistry are rare. The authors present an investigation that introduces high school students to microbe-mineral interactions by tying together anaerobic respiration, reduction reactions, metal ion solubility, and groundwater pollution. During the investigation

Grady, Julie R.; Madden, Andrew S.

2010-01-01

256

An Extended Model of Cybercrime Investigations  

Microsoft Academic Search

A comprehensive model of cybercrime investigations is important for standardising terminology, defining requirements, and supporting the development of new techniques and tools for investigators. In this paper a model of investigations is presented which combines the existing models, generalises them, and extends them by explicitly addressing certain activities not included in them. Unlike previous models, this model explicitly represents the

Seamus O. Ciardhuáin

2004-01-01

257

Biology. Teacher's Guide. Investigations in Natural Science.  

ERIC Educational Resources Information Center

Investigations in Natural Science is a program in secondary school biology, chemistry, and physics based upon the description of science as a quest for knowledge, not the knowledge itself. This teaching guide is designed for use with the 18 biology investigations found in the student manual. These investigations focus on concepts related to:…

Renner, John W.; And Others

258

Mars Climate Orbiter Mishap Investigation Board  

E-print Network

Mars Climate Orbiter Mishap Investigation Board Phase I Report November 10, 1999 #12;2 Table of Contents Mars Climate Orbiter Mishap Investigation Board Phase I Report Page Signature Page (Board Members) and Mars Polar Lander (MPL) Project Descriptions 9 2. MCO Mishap 13 3. Method of Investigation 15 4. MCO

Leveson, Nancy

259

Extended automatic reasoning of criminal investigation  

Microsoft Academic Search

This paper proposes an extended fuzzy reasoning principle (EFRP) for criminal investigation and a new framework for automatic reasoning based on extension relationship mapping. We develop a conceptual model of the cognitive abilities that a criminal investigator uses during a criminal investigation. Two mapping models are set up by constructing a pattern on practical crime model and on-the-spot model respectively.

Jin Li; Ping He

2009-01-01

260

The engineering investigation of aircraft accidents  

NASA Technical Reports Server (NTRS)

The organization and plan for an investigation, procedures used at the scene of the accident, engineering aspects covered in the main investigation, use of special analytical techniques and simulation tools, and use of flight recorder data are discussed. Examples of investigations are used to illustrate the processes used.

Anderson, S. B.

1982-01-01

261

Geologic Field Investigation: Investigating Coastal Features of Western Lake Superior, Inferring Possibilities of their Origins  

NSDL National Science Digital Library

This geologic investigation will have students observing and investigating coastal features of Western Lake Superior using inquiry-based investigable questions, and inferring possibilities of the coastal features' origins.

Davis, Paul

262

Principal Investigator Views of the IRB System  

Microsoft Academic Search

We undertook a qualitative e-mail survey of federally-funded principal investigators of their views of the US human subjects protection system, intended to identify the range of investigator attitudes. This was an exploratory study with a 14% response rate. Twenty-eight principal investigators responded; their comments were analyzed to show underlying themes, which are here presented along with supporting quotations. There was

Simon N. Whitney; Kirsten Alcser; Carl E. Schneider; Laurence B. McCullough; Amy L. McGuire; Robert J. Volk

263

Analytical investigations employing dynamic mechanical properties  

NASA Technical Reports Server (NTRS)

Dynamic mechanical spectroscopy has emerged as an effective laboratory method for analytical investigations of polymers. These methods were applied in investigating the property changes of silicone poppets implanted in artificial heart valves, and for exploring the cause of hardening of certain solid propellants. As a research activity, the property-structure relations which lead to the ability to superimpose dynamic data for epoxy resins were investigated.

Cuddihy, E. F.; Moacanin, J.

1974-01-01

264

Implementing Mathematical Investigations with Young Children  

Microsoft Academic Search

Engaging children in mathematical investigations is advocated as a means of facilitating mathematical learning. However there is limited guidance for teachers on ways to support young children engaged in investigations. This study provides insights into the mathematical literacy required by seven-to-eight-year-old students undertaking investigations. Examples of difficulties are described in relation to problem solving, representation, manipulation, and reasoning. While mathematical

Carmel M Diezmann; James J Watters; Lyn D English

265

Advanced Propulsion Physics Lab: Eagleworks Investigations  

NASA Technical Reports Server (NTRS)

Eagleworks Laboratory is an advanced propulsions physics laboratory with two primary investigations currently underway. The first is a Quantum Vacuum Plasma Thruster (QVPT or Q-thrusters), an advanced electric propulsion technology in the development and demonstration phase. The second investigation is in Warp Field Interferometry (WFI). This is an investigation of Dr. Harold "Sonny" White's theoretical physics models for warp field equations using optical experiments in the Electro Optical laboratory (EOL) at Johnson Space Center. These investigations are pursuing technology necessary to enable human exploration of the solar system and beyond.

Scogin, Tyler

2014-01-01

266

NOAA N-PRIME Mishap Investigation-Final Report NOAA N-PRIME Mishap Investigation  

E-print Network

-PRIME Mishap Investigation-Final Report NOAA N-PRIME Mishap Investigation Final Report September 13, 2004 NASA NATIONAL AERONAUTICS AND SPACE ADMINISTRATION September 13, 2004 #12;NOAA N-PRIME Mishap Investigation-Final Report TABLE OF CONTENTS VOLUME I SECTION TITLE PAGE 1 NOAA N-PRIME Mishap Investigation Board

267

Scaffolding Students' Thinking in Mathematical Investigations  

ERIC Educational Resources Information Center

Mathematical investigations are loosely-defined, engaging problem-solving tasks that allow students to ask their own questions, explore their own interests and set their own goals. The value of investigations for students lies in their complexity. Scaffolding plays an important role in supporting students' high-level engagement by encouraging…

McCosker, Natalie; Diezmann, Carmel M.

2009-01-01

268

25 Low-Cost Biology Investigations.  

ERIC Educational Resources Information Center

This book is a compilation of biology labs that are safe, simple, dependable, economical, and diverse. Some of the 25 investigations contained within this book involve organisms that are free for the taking and returned to the environment unharmed following the investigations. Students gain experience in making observations, forming hypotheses,…

Beller, Joel

269

Investigating Child Language Acquisition through Computational Modelling  

Microsoft Academic Search

Current approaches to the computational modelling of language acquisition tend to investigate particular behaviours such as lexical acquisition and the emergence of syntax in isolation from one another. This paper takes a longitudinal approach to modelling, investigating the developmental trajectory of a single model that tackles several learning problems at the same time. In particular, the model learns to associates

Kris Jack; Chris Reed; Annalu Waller

270

Cognitive failure analysis for aircraft accident investigation  

Microsoft Academic Search

The present studies were undertaken to investigate the applicability of an information processing approach to human failure in the aircraft cockpit. Using data obtained from official aircraft accident investigation reports, a database of accidents and incidents involving New Zealand civil aircraft between 1982 and 1991 was compiled. In the first study, reports were coded into one of three error stages

DAVID OHARE; MARK WIGGINS; RICHARD BATT; DIANNE MORRISON

1994-01-01

271

An investigation of EUV lithography defectivity  

Microsoft Academic Search

We have used ASML's full field step-and-scan exposure tool for extreme ultraviolet lithography (EUVL), known as an Alpha Demo Tool, to investigate one of the critical issues identified for EUVL, defectivity associated with EUV masks. The main objective for this work was to investigate the infrastructure currently in place to examine defects on a EUV reticle and identify their consequence

Kevin D. Cummings; Thomas Laursen; Bill Pierson; Sang-in Han; Robert Watso; Youri van Dommelen; Brian Lee; Yunfei Deng; Bruno La Fontaine; Thomas Wallow; Uzo Okoroanyanwu; Obert Wood; Anna Tchikoulaeva; Christian Holfeld; Jan Hendrick Peters; Chiew-seng Koay; Karen Petrillo; Tony DiBiase; Sumanth Kini; Hiroyuki Mizuno

2008-01-01

272

Investigating the Mathematical Process with Nonlinear Asymptotes  

ERIC Educational Resources Information Center

Under the backdrop of the investigation of rational functions and their respective curved asymptotes, the reader is invited to experience the mathematical process alongside the authors and observe the application of the NCTM Process Standards and the use of multiple representations in the investigation and solution of a problem. (Contains 9…

Bosse, Michael J.; DeUrquidi, Karen A.; Edwards, David L.; Nandakumar, N. R.

2008-01-01

273

Investigations: A Mathematical Cornucopia of Pumpkins  

NSDL National Science Digital Library

This 11-page article presents a hands-on, open-ended activity from "Investigations", a regular feature of Teaching Children Mathematics. The activity focuses on teaching data analysis and algebra through measuring the attributes of pumpkins. The four-day investigation is discussed through lesson plans and support resources.

Gebhard, Glenn

2006-09-01

274

Goals, Objectives, and Investigations for Venus Exploration  

E-print Network

Goals, Objectives, and Investigations for Venus Exploration May 2014 #12; ii Goals, Objectives, and Investigations for Venus Exploration At the VEXAG meeting in November 2012, it was resolved to update the scientific priorities and strategies for Venus exploration. To achieve this goal, three major

Rathbun, Julie A.

275

Outdoor Education: Issues & Investigations, 5-8.  

ERIC Educational Resources Information Center

Designed to familiarize Oklahoma students with their environment by providing opportunities for exploration, investigation, and evaluation, this outdoor education guide contains suggested activities to be used as a starting point to arouse the interest and curiosity of students through direct observation and investigation. As an additional…

Boules, Allen, Ed.

276

DNA Barcoding Investigations Bring Biology to Life  

ERIC Educational Resources Information Center

This article describes how DNA barcoding investigations bring biology to life. Biologists recognize the power of DNA barcoding not just to teach biology through connections to the real world but also to immerse students in the exciting process of science. As an investigator in the Program for the Human Environment at Rockefeller University in New…

Musante, Susan

2010-01-01

277

Investigating Variables : Passengers Supported by Lifeboats  

NSDL National Science Digital Library

Short description This activity is a lab investigation where students develop an investigable inquiry question, construct a fleet of boats, collect data about how many passengers (pennies) each will hold before sinking, interpret their findings, and will share methods and results during a poster session.

278

Crime scene investigation as distributed cognition  

Microsoft Academic Search

Crime scene investigation is a form of Distributed Cognition. The principal concept we explore in this paper is that of 'resource for action'. It is proposed that crime scene investigation employs four primary resources-for-action: (a.) the environment, or scene itself, which affords particular forms of search and object retrieval; (b.) the retrieved objects, which afford translation into evidence; (c.) the

Chris Baber; Paul Smith; James Cross; John E. Hunter; Richard McMaster

2006-01-01

279

Investigating School Leadership Practice: A Distributed Perspective.  

ERIC Educational Resources Information Center

Argues for scholarship that investigates leadership practice; specifically, the practice of leading classroom instruction. Articulates a distributed perspective, grounded in activity theory and distributed cognition, to frame such investigations. Suggests that school leadership is best understood as a distributed practice stretched over the…

Spillane, James P.; Halverson, Richard; Diamond, John B.

2001-01-01

280

Investigation of Concrete Properties to Suppport  

E-print Network

Investigation of Concrete Properties to Suppport Implementation of the New AASHTO Pavement Design-06-03 INVESTIGATION OF CONCRETE PROPERTIES TO SUPPORT IMPLEMENTATION OF THE NEW AASHTO PAVEMENT DESIGN GUIDE Final, Madison, WI; and, Wisconsin Public Service Corporation, Green Bay, WI. Their financial support

Wisconsin-Milwaukee, University of

281

Investigation of the MV Kurdistan casualty  

Microsoft Academic Search

The failure of the MV Kurdistan demonstrates the classic combination of high stress, low toughness and defect which are required to cause initiation of a brittle failure. This paper describes the failure investigation. The casualty illustrates the importance that secondary stresses and thermal stresses can have on the conditions which lead to failure. The formal investigation into the Kurdistan involved

S. J. Garwood

1997-01-01

282

Nursing Home Abuse Report and Investigation Legislation  

Microsoft Academic Search

Nursing home complaint investigation procedures are established by each state's respective legislation. The purpose of this study was to determine the state statutes that had text addressing nursing home report and investigation of abuse and to describe the content of that text. All states and the District of Columbia have statutes addressing the licensure and re-certification of nursing homes. Fourteen

Jeanette M. Daly; Gerald J. Jogerst

2007-01-01

283

An Investigation of Pumped Storage Scheduling  

Microsoft Academic Search

This paper describes how a digital computer program intended for system planning studies was used to investigate several questions related to pumped storage planning and operation. Among the items investigated were reservoir size, the influence of cycle efficiency on pumped storage capacity factor and operating cost, and the effect of load forecasting deviations on system economy. A brief description of

C. D. Galloway; R. J. Ringlee

1966-01-01

284

Investigations of the software testing coupling effect  

Microsoft Academic Search

Fault-based testing strategies test software by focusing on specific, common types of faults. The coupling effect hypothesizes that test data sets that detect simple types of faults are sensitive enough to detect more complex types of faults. This paper describes empirical investigations into the coupling effect over a specific class of software faults. All of the results from this investigation

A. Jefferson Offutt

1992-01-01

285

Investigations in Life Science, Junior High.  

ERIC Educational Resources Information Center

Developed for teachers of junior high school science classes, this unit presents ten investigations on plant growth, animal life, pond life, and general science interests. These investigations are designed to accompany any popular life science textbooks, may be used to supplement a year-long course in life science, are intended as a springboard…

Stephenson, Robert L.

286

Human Factors in Cabin Accident Investigations  

NASA Technical Reports Server (NTRS)

Human factors has become an integral part of the accident investigation protocol. However, much of the investigative process remains focussed on the flight deck, airframe, and power plant systems. As a consequence, little data has been collected regarding the human factors issues within and involving the cabin during an accident. Therefore, the possibility exists that contributing factors that lie within that domain may be overlooked. The FAA Office of Accident Investigation is sponsoring a two-day workshop on cabin safety accident investigation. This course, within the workshop, will be of two hours duration and will explore relevant areas of human factors research. Specifically, the three areas of discussion are: Information transfer and resource management, fatigue and other physical stressors, and the human/machine interface. Integration of these areas will be accomplished by providing a suggested checklist of specific cabin-related human factors questions for investigators to probe following an accident.

Chute, Rebecca D.; Rosekind, Mark R. (Technical Monitor)

1996-01-01

287

How Might You Investigate Scientific Phenomena?  

NSDL National Science Digital Library

This site, part of Exploring Earth Investigation by McDougal Littell and TERC, examines how to investigate scientific phenomena. The investigations "were designed to build students' knowledge of Earth Science conceptsâ¦and to raise student awareness of Earth as a system of interconnected components and processes." Here, visitors will learn about the steps that allow scientists to create valid investigations of phenomena: forming a hypothesis, determining the appropriate method of investigation, collecting and graphing data, and hypothesis testing. Many sections have illustrative images and interactive features which help students understand the topics presented, and the final section ends with questions for students to further explore as well as a link to some NASA datasets. This is an excellent site for any Earth Science classroom as an introductory lecture to the scientific method or as an out-of-class exploration for students.

2008-09-05

288

Methods and Strategies: Developing Investigative Skills Purposefully  

NSDL National Science Digital Library

Members of a team of educators and university students participating in the project, Pittsburgh Partnership for Energizing Science in Urban Schools, addressed the issue of helping students develop investigative skills within the context of an introductory science unit for fourth graders. The unit focuses on data-collection techniques and is a component of the district's required curriculum. It contains four hands-on investigations, each involving a different technique: rubbing, carbon printing, chromatography, and reflecting. The approach described here can be used as a model to transform the skills learned in a science classroom from general to investigative ones.

Wittfeldt, Claudia; Cartier, Jennifer; Paul, John; Pellathy, Stephen L.

2007-11-01

289

Investigation of shielding from cosmic radiation  

NASA Technical Reports Server (NTRS)

Shielding from cosmic radiation is investigated. Attenuation of high energy protons in shielding material is noted and accumulations of radiation doses due to nuclear interactions in the shielding are studied. Shielding of artificial earth satellites is described.

Dubkin, V. Y.; Kovalev, Y. Y.; Skvortsov, S. S.; Smirennyy, L. N.; Vikhrov, A. I.

1973-01-01

290

Interactive eshopping experience: an empirical investigation  

E-print Network

Utilizing an experimental design, the study investigates the effects of eshopping behavior (experiential, utilitarian, or mixed) and interactivity level (low or high) on the consequences of eshopping (site attitude and future purchase intentions...

Mahfouz, Ahmed Yousry Mohamed

2005-02-17

291

76 FR 45577 - Clinical Investigator Training Course  

Federal Register 2010, 2011, 2012, 2013

...Investigator Course'' at the National Labor College at a reduced conference rate. Reservations can be made at https://www.supportnlc...preclinical information (toxicology, animal studies, and chemistry/manufacturing information) that supports initial...

2011-07-29

292

77 FR 60440 - Clinical Investigator Training Course  

Federal Register 2010, 2011, 2012, 2013

...completed form to: Duke University Conference and Event Services, FDA Investigator...Holiday Inn College Park at a reduced conference rate. Reservations for these accommodations...toxicology, animal studies, and chemistry/ manufacturing information) that...

2012-10-03

293

Investigating Plant Physiology with Wisconsin Fast Plants  

NSDL National Science Digital Library

The activities and backgroundinformation in this booklet are designed to support investigations into three primary areas of plant physiology (how plants function): Nutrition, Tropism, and Hormone Response (using gibberellin).

Program, The W.

294

Adolescent Reasoning about Advertisements: Preliminary Investigations.  

ERIC Educational Resources Information Center

Three studies investigate the role of competence factors (defined as acquisition of Piagetian formal reasoning) and performance factors (defined as influences from content and expectations) with respect to adolescents' reasoning about advertisements reporting product tests. (Author/MP)

Linn, Marcia C.; And Others

1982-01-01

295

Federal Bureau of Investigation Safety Tips  

MedlinePLUS

... to content. | Skip to navigation Sections Contact the FBI FBI Headquarters Local FBI Offices Overseas Offices Report Threats & Crime More Contacts... About the FBI Quick Facts What We Investigate Frequently Asked Questions ...

296

29 CFR 1601.15 - Investigative authority.  

Code of Federal Regulations, 2013 CFR

...conference with the parties prior to a determination on a charge of discrimination. The conference is primarily an investigative forum intended to define the issues, to determine which elements are undisputed, to resolve those issues that can be resolved...

2013-07-01

297

Two-Phase Flow Separator Investigation  

NASA Video Gallery

The goal of the Two-Phase Flow Separator investigation is to help increase understanding of how to separate gases and liquids in microgravity. Many systems on the space station contain both liquids...

298

Research Goals Investigate these learning systems with  

E-print Network

Research Goals · Investigate these learning systems with naturally-occurring auditory stimuli with visual stimuli has clarified memory processes, two of which have been found in the language network impairment. Modeling & Results Modeling & Results Continued References Reflexive

Maddox, W. Todd

299

21 CFR 1230.33 - Investigations.  

Code of Federal Regulations, 2010 CFR

... REGULATIONS UNDER CERTAIN OTHER ACTS ADMINISTERED BY THE FOOD AND DRUG ADMINISTRATION REGULATIONS UNDER THE FEDERAL CAUSTIC POISON ACT Administrative Procedures § 1230.33 Investigations. Authorized agents in the employ of the Department of...

2010-04-01

300

7 CFR 246.21 - Investigations.  

...FOOD AND NUTRITION SERVICE, DEPARTMENT OF AGRICULTURE CHILD NUTRITION PROGRAMS SPECIAL SUPPLEMENTAL NUTRITION PROGRAM FOR WOMEN, INFANTS AND CHILDREN Monitoring and Review § 246.21 Investigations. (a) Authority. The...

2014-01-01

301

ORIGINAL INVESTIGATION Cholesterol Lowering, Cardiovascular Diseases,  

E-print Network

ORIGINAL INVESTIGATION Cholesterol Lowering, Cardiovascular Diseases, and the Rosuvastatin Rabaeus, MD Background: Among the recently reported cholesterol- lowering drug trials, the JUPITER or low cholesterol levels. Methods: Careful review of both results and methods used in the trial

Paris-Sud XI, Université de

302

8 CFR 331.3 - Investigation.  

Code of Federal Regulations, 2010 CFR

...to or after the examination on the application. This investigation shall encompass, but not be limited to, the applicant's loyalty to the United States and attachment to the country, state, or sovereignty with which the United States is at...

2010-01-01

303

25 CFR 556.4 - Background investigations.  

Code of Federal Regulations, 2010 CFR

...Section 556.4 Indians NATIONAL INDIAN GAMING COMMISSION, DEPARTMENT OF THE INTERIOR GAMING LICENSES AND BACKGROUND INVESTIGATIONS FOR...management official and for each key employee of a gaming operation. (a) A tribe shall...

2010-04-01

304

40 CFR 68.60 - Incident investigation.  

Code of Federal Regulations, 2011 CFR

...CONTINUED) AIR PROGRAMS (CONTINUED) CHEMICAL ACCIDENT PREVENTION PROVISIONS Program 2 Prevention...e) The findings shall be reviewed with all affected personnel whose job tasks are affected by the findings. (f) Investigation...

2011-07-01

305

40 CFR 68.60 - Incident investigation.  

Code of Federal Regulations, 2012 CFR

...CONTINUED) AIR PROGRAMS (CONTINUED) CHEMICAL ACCIDENT PREVENTION PROVISIONS Program 2 Prevention...e) The findings shall be reviewed with all affected personnel whose job tasks are affected by the findings. (f) Investigation...

2012-07-01

306

40 CFR 68.60 - Incident investigation.  

Code of Federal Regulations, 2010 CFR

...CONTINUED) AIR PROGRAMS (CONTINUED) CHEMICAL ACCIDENT PREVENTION PROVISIONS Program 2 Prevention...e) The findings shall be reviewed with all affected personnel whose job tasks are affected by the findings. (f) Investigation...

2010-07-01

307

Investigation of critical burning of fuel droplets  

NASA Technical Reports Server (NTRS)

The general problem of spray combustion was investigated. The combustion of bipropellent droplets; combustion of hydrozine fuels; and combustion of sprays were studied. A model was developed to predict mean velocities and temperatures in a combusting gas jet.

Faeth, G. M.

1979-01-01

308

Mathematical Investigations Using Logo. Part Two.  

ERIC Educational Resources Information Center

Programs (using Logo) developed by children to produce multiples, the Fibonacci series, and square numbers are presented, with graphical representations of functions introduced. Another investigation involves drawing a circle using turtle graphics. (MNS)

Brown, Ken

1986-01-01

309

Investigation of Porous Lithium Battery Electrodes.  

National Technical Information Service (NTIS)

The objective of this program is to investigate methods for producing highly porous lithium electrodes for use in rechargeable spacecraft batteries. This report describes theoretical considerations for, and experimental measurements of, electrochemical pa...

J. McCallum, D. E. Semones, E. A. Roeger, C. L. Faust

1966-01-01

310

Investigating packaging effects on bandgap references  

E-print Network

This thesis investigates packaging effects on precision bandgap voltage references used in LTC switching regulators. Packaging stress causes a mean offset and room temperature distribution widening of the bandgap reference ...

Palakodety, Ravi (Ravi Kiran)

2007-01-01

311

7 CFR 966.72 - Investigation.  

... AGRICULTURAL MARKETING SERVICE (MARKETING AGREEMENTS AND ORDERS; FRUITS, VEGETABLES, NUTS), DEPARTMENT OF AGRICULTURE TOMATOES GROWN IN FLORIDA Order Regulating Handling Exemptions § 966.72 Investigation. The committee shall be...

2014-01-01

312

48 CFR 750.7110-1 - Investigation.  

Code of Federal Regulations, 2011 CFR

...FOR INTERNATIONAL DEVELOPMENT CONTRACT MANAGEMENT EXTRAORDINARY CONTRACTUAL ACTIONS Extraordinary Contractual Actions To Protect Foreign Policy Interests of the United States 750.7110-1 Investigation. The Evaluation Division of...

2011-10-01

313

48 CFR 750.7110-1 - Investigation.  

Code of Federal Regulations, 2010 CFR

...FOR INTERNATIONAL DEVELOPMENT CONTRACT MANAGEMENT EXTRAORDINARY CONTRACTUAL ACTIONS Extraordinary Contractual Actions To Protect Foreign Policy Interests of the United States 750.7110-1 Investigation. The Evaluation Division of...

2010-10-01

314

48 CFR 750.7110-1 - Investigation.  

Code of Federal Regulations, 2012 CFR

...FOR INTERNATIONAL DEVELOPMENT CONTRACT MANAGEMENT EXTRAORDINARY CONTRACTUAL ACTIONS Extraordinary Contractual Actions To Protect Foreign Policy Interests of the United States 750.7110-1 Investigation. The Evaluation Division of...

2012-10-01

315

Investigation of Variables Associated with Vaccine Acceptance  

E-print Network

Abstract The current study investigated the relationship between the Health Belief Model (HBM) framework, social variables, personality factors, and H1N1 flu vaccine acceptance. Four hundred thirty two undergraduate students completed online...

Black, Lora L.

2011-12-31

316

Investigating Factors Influencing Rates of Chemical Reactions  

NSDL National Science Digital Library

This activity is a lab investigation in which students observe the rate of generation of hydrogen gas from a reaction, and then modify the procedure to compare another variable affecting the rate of this reaction.

Derickson, Paula

317

Exploring Magnetism: Investigating the forces of magnets  

NSDL National Science Digital Library

This activity is a classroom and lab investigation of magnetism. Students gather results of experiments involving the forces of magnets. They use this data to develop their own experiments to test properties of magnets.

318

Preliminary Investigation of Profiling Tools and Methods.  

National Technical Information Service (NTIS)

The purpose of this technical memorandum is to outline the proposed component of project 15AG: Canadian Forces (CF) Enhanced Influence Operations and the preliminary investigation of profiling tools for CF application and purposes. There are several diffe...

A. Hawton, C. Powlesland, K. Richards, Q. Lam, W. Sullivan-Kwantes

2011-01-01

319

Investigation of the Helios Prototype Aircraft Mishap  

E-print Network

Investigation of the Helios Prototype Aircraft Mishap Volume I Mishap Report Thomas E. Noll NASA ­ Mishap Report SECTION TITLE PAGE Acknowledgements Description of Mishap........................................... 31 8 Independent Analyses and Tests

320

Investigator Resources | Translational Research Program (TRP)  

Cancer.gov

Skip to Content Search this site Investigator Resources Main SPORE Program Announcements Pre-Application Materials Frequently Used Terms SPORE Grant Application Forms Last Updated: 10/23/13 SPORE Grant Application Forms Application Submission System

321

Investigating Ecosystems: Determining Feeding Relationships among Organisms  

NSDL National Science Digital Library

This activity is a field investigation in which students identify organisms and their energy sources. Students collect data and create a food web that explains how the organisms in their ecosystem are related.

Anna Potvin, Pine City Secondary, Pine City, MN

322

Investigations in Marine Chemistry: Tide Pool Ecology.  

ERIC Educational Resources Information Center

Students investigated the salinity of tide pools at different levels in the intertidal zone. Data are analyzed collectively. Students graphed and discussed data. Included are suggestions for evaluation and further study. (Author)

Schlenker, Richard M.

323

PILOT INVESTIGATION OF SECONDARY SLUDGE DEWATERING ALTERNATIVES  

EPA Science Inventory

A pilot investigation of biological sludge thickening and dewatering alternatives, including pressure filtration, precoat vacuum filtration, filter belt pressing, capillary suction, dewatering, gravity filtration, centrifugation, and ultrafiltration has been conducted on waste ac...

324

29 CFR 1960.29 - Accident investigation.  

Code of Federal Regulations, 2011 CFR

...ADMINISTRATION, DEPARTMENT OF LABOR (CONTINUED) BASIC PROGRAM ELEMENTS FOR FEDERAL EMPLOYEE OCCUPATIONAL SAFETY AND HEALTH PROGRAMS...accident investigations which would be of benefit in developing a new OSHA standard or in modifying or revoking an existing...

2011-07-01

325

29 CFR 1960.29 - Accident investigation.  

Code of Federal Regulations, 2010 CFR

...ADMINISTRATION, DEPARTMENT OF LABOR (CONTINUED) BASIC PROGRAM ELEMENTS FOR FEDERAL EMPLOYEE OCCUPATIONAL SAFETY AND HEALTH PROGRAMS...accident investigations which would be of benefit in developing a new OSHA standard or in modifying or revoking an existing...

2010-07-01

326

29 CFR 1960.29 - Accident investigation.  

Code of Federal Regulations, 2012 CFR

...ADMINISTRATION, DEPARTMENT OF LABOR (CONTINUED) BASIC PROGRAM ELEMENTS FOR FEDERAL EMPLOYEE OCCUPATIONAL SAFETY AND HEALTH PROGRAMS...accident investigations which would be of benefit in developing a new OSHA standard or in modifying or revoking an existing...

2012-07-01

327

INFOED ELECTRONIC RESEARCH ADMINISTRATION For Principal Investigators  

E-print Network

INFOED ELECTRONIC RESEARCH ADMINISTRATION User Guide For Principal Investigators June 2014 PI ................................................................................................................ 1 2 Creating a New Proposal in PD ........................................................ 2 2.2 Completing the New Proposal Questionnaire

Stuart, Steven J.

328

Mechanisms of superconductivity investigated by nuclear radiation  

NASA Technical Reports Server (NTRS)

Investigation focused on the behavior of superconducting magnet and its constituent materials during and after exposure to nuclear radiation. The results will indicate the feasibility of their use in diverse applications and various environments.

Autler, S. H.; Coffey, H. T.; Keller, E. L.; Patterson, A.

1967-01-01

329

How Might You Investigate Scientific Phenomena  

NSDL National Science Digital Library

Exploring Earth Investigations are Internet-based activities that use animations, interactive graphics, and unique imagery to help students gather information about a particular Earth science theme, issue, or concept.

TERC (www.terc.edu)

330

Forensic Pathology and the Investigation of Death  

Microsoft Academic Search

\\u000a When death occurs suddenly and unexpectedly or by violent means, society looks to public authorities for answers and accountability.\\u000a The National Academy of Sciences recommends establishing medical examiner systems throughout the country to investigate these\\u000a deaths to certify the cause and manner of death. Minimum requirements for resources and staffing must be met to provide adequate\\u000a death investigations for a

Elizabeth A. Laposata

331

Inorganic scintillators in direct dark matter investigation  

NASA Astrophysics Data System (ADS)

The discoveries, the developments and the studies that have been performed in the research of new materials and purification techniques, nowadays allow us a wide choice among inorganic scintillators for a variety of uses. In this paper the application of the inorganic crystal scintillators to direct dark matter investigation will be considered in more detail. The present framework of the detectors used at low energy for direct dark matter investigation also offers useful hints for further corollary developments.

Belli, P.; Incicchitti, A.; Cappella, F.

2014-07-01

332

Investigation of atmospheric waves on Neptune  

Microsoft Academic Search

This document constitutes the final report for grant NAGW-2442 of the Neptune Data Analysis Program, which supported research concerning atmospheric dynamics on Neptune. Professor Von R. Eshleman was the principal investigator. David P. Hinson was a Co-Investigator. The grant covered the period 1 March 1991 through 31 August 1994, including a six month no-cost extension. Funding from this grant resulted

Von R. Eshleman; David P. Hinson

1994-01-01

333

Investigation of paramagnetic response of metallic epoxies  

NASA Technical Reports Server (NTRS)

The paramagnetic properties of epoxies which were impregnated with metal ions were examined as the primary task in this research. A major conclusion was that the quality control of the epoxies was insufficient to permit reliable evaluation. Subsequently, a new set of specimens is being prepared. As an additional task, a new method is investigated for estimating heats of combustion for saturated hydrocarbons. The results of that investigation have shown that the empirical approach is a promising method for on-line measurements.

Ash, R. L.; Chegini, H.

1986-01-01

334

Cancer Prevention and Control Investigators Workshop  

Cancer.gov

The purpose of the Cancer Prevention and Control Investigators Workshop is to convene key investigators from each of the Community Clinical Oncology Program's (CCOP) Research Bases to outline the National Cancer Institute's (NCI) expanded focus for cancer control and prevention research for the future. The expanded focus resulted from the yearlong deliberation of the CCOP Strategic Issues and Priorities, which have been approved by the Board of Scientific Advisors and the NCI Scientific Program Leadership Group.

335

Cancer Prevention and Control Investigators Meeting  

Cancer.gov

The purpose of the Cancer Prevention and Control Investigators Workshop is to convene key investigators from each of the Community Clinical Oncology Program's (CCOP) Research Bases to outline the National Cancer Institute's (NCI) focus for cancer control and prevention research for the future. In addition to discussing the yearlong deliberation of the CCOP Strategic Issues and Priorities, which have been approved by the NCI leadership, the priorities of the new Director of the Division of Cancer Prevention will be discussed.

336

Internal compliance investigations can reduce government sanctions.  

PubMed

An effective corporate compliance program is facilitated by three essential elements: a well-qualified compliance officer; a policy of immediate investigation of every report of potential fraud and abuse; and clearly defined roles for both corporate and outside counsel in conducting the investigations. A government agency is less likely to exercise the full extent of its powers when these elements are in place and three is evidence of a sincere compliance effort. PMID:10173966

Mustokoff, M M; Yecies, M S

1997-10-01

337

Investigation of laser polarized xenon magnetic resonance  

NASA Technical Reports Server (NTRS)

Ground-based investigations of a new biomedical diagnostic technology: nuclear magnetic resonance of laser polarized noble gas are addressed. The specific research tasks discussed are: (1) Development of a large-scale noble gas polarization system; (2) biomedical investigations using laser polarized noble gas in conventional (high magnetic field) NMR systems; and (3) the development and application of a low magnetic field system for laser polarized noble gas NMR.

Walsworth, Ronald L.

1998-01-01

338

Tripod-BETA: Incident investigation and analysis  

SciTech Connect

Tripod-BETA is a methodology for conducting an incident analysis in parallel with the investigation, supported by a PC based tool. Interaction between these two processes provides the investigators with confirmation of the relevance of their fact gathering and highlights avenues of investigation leading to latent failures. The benefit to the analysis process is that logical anomalies can be highlighted and resolved while The investigation is still active. Tripod-BETA focuses initially on the accident mechanism - the physical process of the accident - and uses it as a structure to identify the controls and defenses that should have been in place. For the incident to happen these controls and defenses either were missing or failed. The investigation then examines the immediate and latent failures behind each missing or failed defense, following the Tripod theory of accident causation. Tripod-BETA software provides the means to collect and assemble investigation facts and manipulate them on screen into a graphic representation of the event and its causes - an accident tree. The logic of the tree structure (labeling and connections) can be tested to ensure that it conforms to the concepts of the Hazard and Effects Management Process (HEMP) and the Tripod theory. When anomalies and omissions have been resolved, a draft accident report can be auto-generated for final editing using a word processing package.

Doran, J.A.; Graaf, G.C. van der

1996-12-31

339

RCRA Facility Investigation/Remedial Investigation Report for the Grace Road Site (631-22G)  

SciTech Connect

This report summarizes the activities and documents the results of a Resource Conservation and Recovery Act Facility Investigation/Remedial Investigation conducted at Grace Road Site on the Savannah River Site near Aiken, South Carolina.

Palmer, E.

1998-10-02

340

Injury and Illness Prevention Programs Investigation of Accidents, Injuries and Illnesses INVESTIGATION OF ACCIDENTS,  

E-print Network

Injury and Illness Prevention Programs Investigation of Accidents, Injuries and Illnesses 1 INVESTIGATION OF ACCIDENTS, INJURIES AND ILLNESSES AG TOOL 1 I. Purpose Investigations are conducted to find out the cause of accidents, injuries and illnesses, and to prevent similar events from happening in the future

Leistikow, Bruce N.

341

The stages of cybercrime investigations: Bridging the gap between technology examination and law enforcement investigation  

Microsoft Academic Search

Cybercrime investigation can be argued as still in its infancy. The technical investigation practices and procedures of global law enforcement are also still evolving in response to the growing threat of the cybercriminal. This has led to considerable debate surrounding the adequacy of current technical investigation models, examination tools and the subsequent capability of law enforcement to tackle cybercrime. To

Paul Hunton

2011-01-01

342

Investigation Organizer: the development and testing of a Web-based tool to support mishap investigations  

Microsoft Academic Search

Investigation Organizer (IO) is a collaborative Web-based system designed to support the conduct of mishap investigations. IO provides a common repository for a wide range of mishap related information, and allows investigators to make explicit, shared, and meaningful links between evidence, causal models, findings and recommendations. It integrates the functionality of a database, a common document repository, a semantic knowledge

Robert E. Carvalho; James Williams; Ian Sturken; Richard Keller; Tina Panontin

2005-01-01

343

Scientific Investigations of Elementary School Children  

NASA Astrophysics Data System (ADS)

The study provides evidence concerning elementary school children's ability to conduct a scientific investigation. Two hundred and fifty sixth-grade students and 248 fourth-grade students were administered a test, and based on their performance, they were classified into high-ability and low-ability students. The sample of this study was randomly selected and included 80 students, 40 fourth-grade and 40 sixth-grade students of low and high abilities. Students were specifically instructed to investigate the functioning of a device, to think aloud prior and after any experiment with the device, and to keep a record of their experimental results. The results showed that students were inclined to mainly collect evidence from the experimental space and failed to control variables during their investigation. The majority of the students had difficulties with effectively organizing collected data and failed to coordinate hypotheses with evidence. The significant interaction effect that was found between grade level and ability in terms of students' investigation ability indicates that the existing gap between high- and low-ability students becomes bigger as students become older. Undoubtedly, ongoing research efforts for identifying patterns of children's cognitive development will be most valuable as they can have important implications for the design of teaching scenarios and inquiry-based science activities conducive to accelerating students' cognitive growth and scientific investigation abilities.

Valanides, Nicos; Papageorgiou, Maria; Angeli, Charoula

2013-04-01

344

Cyber Forensics Ontology for Cyber Criminal Investigation  

NASA Astrophysics Data System (ADS)

We developed Cyber Forensics Ontology for the criminal investigation in cyber space. Cyber crime is classified into cyber terror and general cyber crime, and those two classes are connected with each other. The investigation of cyber terror requires high technology, system environment and experts, and general cyber crime is connected with general crime by evidence from digital data and cyber space. Accordingly, it is difficult to determine relational crime types and collect evidence. Therefore, we considered the classifications of cyber crime, the collection of evidence in cyber space and the application of laws to cyber crime. In order to efficiently investigate cyber crime, it is necessary to integrate those concepts for each cyber crime-case. Thus, we constructed a cyber forensics domain ontology for criminal investigation in cyber space, according to the categories of cyber crime, laws, evidence and information of criminals. This ontology can be used in the process of investigating of cyber crime-cases, and for data mining of cyber crime; classification, clustering, association and detection of crime types, crime cases, evidences and criminals.

Park, Heum; Cho, Sunho; Kwon, Hyuk-Chul

345

(Hyperfine experimental investigation of zirconia ceramics)  

SciTech Connect

This research program has encompassed a broad investigation of microscopic structure and point defect properties in insulating materials and some recent exploratory work on semiconductors. The major experimental technique is perturbed angular correlation (PAC) spectroscopy. Our research provides information about the microscopic structure, nucleation, and equilibrium of structural phases in materials under investigation. We have studied phase equilibria in monoclinic, tetragonal, and cubic zirconia in the past and have recently begun more detailed investigation of high-temperature anomalies in monoclinic zirconia and tetragonal stabilized zirconia. We also have found a number of instances where the indium PAC probe has detected subtle phase changes, small precipitate formation, and other phase behavior that are difficult to detect by conventional diffraction methods. The PAC experimental technique is described briefly in section 2, and recent research is reviewed in section 3.

Not Available

1992-01-01

346

Applying Machine Trust Models to Forensic Investigations  

NASA Astrophysics Data System (ADS)

Digital forensics involves the identification, preservation, analysis and presentation of electronic evidence for use in legal proceedings. In the presence of contradictory evidence, forensic investigators need a means to determine which evidence can be trusted. This is particularly true in a trust model environment where computerised agents may make trust-based decisions that influence interactions within the system. This paper focuses on the analysis of evidence in trust-based environments and the determination of the degree to which evidence can be trusted. The trust model proposed in this work may be implemented in a tool for conducting trust-based forensic investigations. The model takes into account the trust environment and parameters that influence interactions in a computer network being investigated. Also, it allows for crimes to be reenacted to create more substantial evidentiary proof.

Wojcik, Marika; Venter, Hein; Eloff, Jan; Olivier, Martin

347

Investigation of organic adhesives for hybrid microcircuits  

NASA Technical Reports Server (NTRS)

The properties of organic adhesives were investigated to acquire information for a guideline document regarding the selection of adhesives for use in high reliability hybrid microcircuits. Specifically, investigations were made of (1) alternate methods for determining the outgassing of cured adhesives, (2) effects of long term aging at 150 C on the electrical properties of conductive adhesives, (3) effects of shelf life age on adhesive characteristics, (4) bond strengths of electrically conductive adhesives on thick film gold metallization, (5) a copper filled adhesive, (6) effects of products outgassed from cured adhesives on device electrical parameters, (7) metal migration from electrically conductive adhesives, and (8) ionic content of electrically insulative adhesives. The tests performed during these investigations are described, and the results obtained are discussed.

Perkins, K. L.; Licari, J. J.

1975-01-01

348

A program for training physician-investigators.  

PubMed

A decreasing number of physicians are selecting careers in clinical investigation. In order to aid in reversing this trend, the Physician Investigator Training Program for residents and postdoctoral fellows was developed within the Department of Medicine at the University of Pittsburgh School of Medicine. Ph. D.s with broad-based research experience serve as the core faculty. The trainees are not assigned clinical duties during the two-year period of the program. The first nine months of the curriculum consist of formal lectures and laboratory training encompassing basic laboratory techniques, cell and tissue culture, separation techniques, advanced instrumental techniques, kinetics, enzymology and receptors, membrane structure and transport, radioimmunoassay, statistical analysis, computer programming, mathematics, microbiology, animals in research, immunology, epidemiology, teaching methods, and manuscript and grant-writing. The last 15 months are devoted to a supervised laboratory research project. The program may serve as a model to train increased numbers of physician-investigators. PMID:7097733

Lehotay, D C; Dugas, M; Levey, G S

1982-08-01

349

A European approach to clinical investigator training  

PubMed Central

A better education and training of clinical investigators and their teams is one of the factors that could foster the development of clinical research in Europe, a key objective of the Innovative Medicines Initiative (IMI). PharmaTrain (an IMI programme on training in medicines development), and European Clinical Research Infrastructures Network (ECRIN) have joined forces to address this issue. An advisory group composed of representatives of universities, pharmaceutical companies and other organisations met four times between June 2011 and July 2012. This resulted in a position paper proposing a strategy to improve and harmonize clinical investigator training in Europe, and including a detailed syllabus and list of learning outcomes. Major recommendations are the establishment of minimal and mutually recognized certification requirement for investigators throughout the EU and the creation of a European platform to provide a suitable course and examination infrastructure. PMID:24058345

Boeynaems, Jean-Marie; Canivet, Cindy; Chan, Anthony; Clarke, Mary J.; Cornu, Catherine; Daemen, Esther; Demotes, Jacques; Nys, Katelijne De; Hirst, Barry; Hundt, Ferdinand; Kassai, Behrouz; Kerpel-Fronius, Sandor; Kiessig, Lucy; Klech, Heinrich; Kraehenbuhl, Jean-Pierre; Lafolie, Pierre; Lucht, Martin; Niese, Detlef; Pauli-Magnus, Christiane; Peters, Barbara; Schaltenbrand, Ralf; Stockis, Armel; Stykova, Martina; Verheus, Nicolette; Klingmann, Ingrid

2013-01-01

350

Columbia Accident Investigation Board Report. Volume 3  

NASA Technical Reports Server (NTRS)

This report describes the results of an investigative analysis performed by the Air Force Research Laboratory Sensors Directorate at th the specific request of the Defense Columbia Investigation Support Team (DCIST) who was supporting the Columbia Accident Investigation Board (CAIB). The work was performed during the period February 20, 2003 through 20 July 2003. An interim release of measurement findings was provided the CAIB on 24 April 2003, and the information was released in public testimony to the CAIB on May 6, 2003 at the Hilton Hotel, Houston, Texas. The overall assessment and conclusions of this report are consistent with the CAIB 6 May 2003 testimony, with one notable exception discussed in Section VI. This report has been reviewed by the AFRL/SN Flight Day Two DCIST appointed assessment team, and is hereby released to the CAIB and DCIST for final disposition.

White, Donald J. (Editor); Goodman, Patrick A. (Editor); Reingold, Lester A. (Editor); Kirchhoff, Christopher M. (Editor); Simon, Ariel H. (Editor)

2003-01-01

351

Laboratory Investigations of the Extreme Universe  

SciTech Connect

Recent years have seen tremendous progress in our understanding of the extreme universe, which in turn points to even deeper questions to be further addressed. History has shown that the symbiosis between direct observations and laboratory investigation is instrumental in the progress of astrophysics. Current frontier astrophysical phenomena related to particle astrophysics and cosmology typically involve one or more of the following conditions: (1) extremely high energy events; (2) very high density, high temperature processes; (3) super strong field environments. Laboratory experiments using high intensity lasers and particle beams can calibrate astrophysical observation or detection processes, investigate the underlying dynamics of astrophysical phenomena, and probe into fundamental physics in extreme limits. We give examples of possible laboratory experiments that investigate into the extreme universe.

Chen, Pisin

2003-08-06

352

Independent accident investigation: a modern safety tool.  

PubMed

Historically, safety has been subjected to a fragmented approach. In the past, every department has had its own responsibility towards safety, focusing either on working conditions, internal safety, external safety, rescue and emergency, public order or security. They each issued policy documents, which in their time were leading statements for elaboration and regulation. They also addressed safety issues with tools of various nature, often specifically developed within their domain. Due to a series of major accidents and disasters, the focus of attention is shifting from complying with quantitative risk standards towards intervention in primary operational processes, coping with systemic deficiencies and a more integrated assessment of safety in its societal context. In The Netherlands recognition of the importance of independent investigations has led to an expansion of this philosophy from the transport sector to other sectors. The philosophy now covers transport, industry, defense, natural disaster, environment and health and other major occurrences such as explosions, fires, and collapse of buildings or structures. In 2003 a multi-sector covering law will establish an independent safety board in The Netherlands. At a European level, mandatory investigation agencies are recognized as indispensable safety instruments for aviation, railways and the maritime sector, for which EU Directives are in place or being progressed [Transport accident and incident investigation in the European Union, European Transport Safety Council, ISBN 90-76024-10-3, Brussel, 2001]. Due to a series of major events, attention has been drawn to the consequences of disasters, highlighting the involvement of rescue and emergency services. They also have become subjected to investigative efforts, which in return, puts demands on investigation methodology. This paper comments on an evolutionary development in safety thinking and of safety boards, highlighting some consequences for strategic perspectives in a further development of independent accident investigation. PMID:15231346

Stoop, John A

2004-07-26

353

Wildlife health investigations: needs, challenges and recommendations  

PubMed Central

In a fast changing world with growing concerns about biodiversity loss and an increasing number of animal and human diseases emerging from wildlife, the need for effective wildlife health investigations including both surveillance and research is now widely recognized. However, procedures applicable to and knowledge acquired from studies related to domestic animal and human health can be on partly extrapolated to wildlife. This article identifies requirements and challenges inherent in wildlife health investigations, reviews important definitions and novel health investigation methods, and proposes tools and strategies for effective wildlife health surveillance programs. Impediments to wildlife health investigations are largely related to zoological, behavioral and ecological characteristics of wildlife populations and to limited access to investigation materials. These concerns should not be viewed as insurmountable but it is imperative that they are considered in study design, data analysis and result interpretation. It is particularly crucial to remember that health surveillance does not begin in the laboratory but in the fields. In this context, participatory approaches and mutual respect are essential. Furthermore, interdisciplinarity and open minds are necessary because a wide range of tools and knowledge from different fields need to be integrated in wildlife health surveillance and research. The identification of factors contributing to disease emergence requires the comparison of health and ecological data over time and among geographical regions. Finally, there is a need for the development and validation of diagnostic tests for wildlife species and for data on free-ranging population densities. Training of health professionals in wildlife diseases should also be improved. Overall, the article particularly emphasizes five needs of wildlife health investigations: communication and collaboration; use of synergies and triangulation approaches; investments for the long term; systematic collection of metadata; and harmonization of definitions and methods. PMID:24188616

2013-01-01

354

Wildlife health investigations: needs, challenges and recommendations.  

PubMed

In a fast changing world with growing concerns about biodiversity loss and an increasing number of animal and human diseases emerging from wildlife, the need for effective wildlife health investigations including both surveillance and research is now widely recognized. However, procedures applicable to and knowledge acquired from studies related to domestic animal and human health can be on partly extrapolated to wildlife. This article identifies requirements and challenges inherent in wildlife health investigations, reviews important definitions and novel health investigation methods, and proposes tools and strategies for effective wildlife health surveillance programs. Impediments to wildlife health investigations are largely related to zoological, behavioral and ecological characteristics of wildlife populations and to limited access to investigation materials. These concerns should not be viewed as insurmountable but it is imperative that they are considered in study design, data analysis and result interpretation. It is particularly crucial to remember that health surveillance does not begin in the laboratory but in the fields. In this context, participatory approaches and mutual respect are essential. Furthermore, interdisciplinarity and open minds are necessary because a wide range of tools and knowledge from different fields need to be integrated in wildlife health surveillance and research. The identification of factors contributing to disease emergence requires the comparison of health and ecological data over time and among geographical regions. Finally, there is a need for the development and validation of diagnostic tests for wildlife species and for data on free-ranging population densities. Training of health professionals in wildlife diseases should also be improved. Overall, the article particularly emphasizes five needs of wildlife health investigations: communication and collaboration; use of synergies and triangulation approaches; investments for the long term; systematic collection of metadata; and harmonization of definitions and methods. PMID:24188616

Ryser-Degiorgis, Marie-Pierre

2013-01-01

355

Parasexuality in genitourinary investigations: a qualitative study  

PubMed Central

Background Genitourinary investigations are performed on a large proportion of middle-aged and older men and the majority undergo investigations for prostate issues. The effects that genitourinary disease can have on men depend on the type of problem, investigations required and treatment including impotence, gynaecomastia and urinary incontinence that have lasting devastating physical, social and psychological effects. The aim was to explore older men’s experience and views of intimate and intrusive genitourinary investigations and specifically to develop hypotheses and theories concerning gender and sexuality issues in intimate genitourinary investigations. Methods Written informed consent was obtained for this qualitative study. Data were collected through one-off, semi-structured interviews involving 15 men in the first year following patient’s last urological procedure. Initially, multiple themes were identified and when analysed further concepts were repeatedly present. As the urological investigations were limited to men, gender and sexuality became prominent issues in the data. Results On analysis, the term parasexuality appeared to explain the dynamic of the situation. Parasexuality is a modified form of sexuality which is channelled and limited to maintain propriety. This was not expressed as sexuality in its overt, explicit sense, but instead a type of covert sexuality where professional boundaries are maintained but nonetheless undercurrents remain. This managed version of sexuality created a common currency by which interactions between staff and patients could take place safely. Feeding into parasexuality were gender role stereotypes and for some of the participants this reflected their own experience, context, historical and cultural norms. Intimate contact in the form of exposure and handling of the participants' genitalia during the investigations particularly challenged the boundaries of parasexuality. In order to remain parasexual, many of the participants suppressed their sexuality. Viewing staff as professional was an additional strategy used by participants to limit any sexuality as parasexuality. Conclusion This study has contributed towards the appeal for more studies to examine privacy perceptions of patients in genitalia-related care, however, it is by no means definitive. Parasexuality goes some way to explain the dynamics of communication between older men and health care professionals during genitourinary investigations. PMID:24606673

2014-01-01

356

Microbiologic investigations for head and neck infections.  

PubMed

A variety of methods, including direct examination of stained smears, antigen detection, routine and special cultures, and histopathologic evaluation are available for investigation of head and neck infections. Newer rapid molecular techniques with increased sensitivity and specificity are becoming available at many centers. Evaluation of specific causes in head and neck infections is complicated by the tendency for polymicrobial infections, difficulty in obtaining adequate specimens, and the presence of a diverse endogenous microflora at various mucosal sites that also can include true pathogens. These aspects of laboratory investigation for head and neck infections are reviewed in this article. PMID:17561072

Roscoe, Diane L; Hoang, Linda

2007-06-01

357

Foil Diffuser Investigation with GEANT4  

E-print Network

An investigation into the appropriate materials for use as a diffuser foil in electron radiography was undertaken in GEANT4. Simulations were run using various refractory materials to determine a material of appropriate Z number such that energy loss is minimal. The plotted results of angular spread and energy spread are shown. It is concluded that higher Z number materials such as tungsten, tantalum, platinum or uranium could be used as diffuser materials. Also, an investigation into the handling of bremsstrahlung, multiple coulomb scattering, and ionization in GEANT4 was performed.

Fabritius, Joseph M; Walstrom, Peter

2013-01-01

358

The Living With a Star Geospace Investigations  

NASA Technical Reports Server (NTRS)

The Living With a Star Geospace Investigations is established to effectively address those phenomena the Geospace environment that directly affect life and society. The priority science questions focus on two broad areas: (1) ionospheric variability, especially at mid-latitudes, that affects navigation and communications and (2) the source, acceleration mechanisms, and sinks of the radiation belts that degrade satellite lifetimes, produce surface charging, and threaten manned space flight. Candidate missions to address these science foci will be presented as well as possible additional investigations and experiments that would enable an understanding of the Geospace at the system level.

Spann, Jim; Kintner, Paul; Six, N. Frank (Technical Monitor)

2002-01-01

359

US Chemical Safety and Hazard Investigation Board  

NSDL National Science Digital Library

The US Chemical Safety and Hazard Investigation Board began operations in 1998 with the stated mission to promote the prevention of major chemical accidents at fixed facilities. The independent, scientific investigative agency's Web site contains historical and current data, reports, and other information on chemical accidents from around the nation. For example, on September 13, 2002, a chemical plant explosion occurred in Freeport, Texas, involving an explosion, fire, and release of chemicals to the environment. The entry contains which specific chemicals were involved and a brief report of the incident, as well as injury, containment, and other relevant information.

1998-01-01

360

The Rolling Can Investigation: Towards an Explanation  

ERIC Educational Resources Information Center

This paper presents a context lead approach to rotational dynamics. By using nothing more than two cans of cola the basic notions of linear velocity, angular velocity, moments of inertia and conservation of energy can be explored. The approach can be used equally well as both a demonstration or an investigative assignment. The same starting point…

Ireson, Gren; Twidle, John

2005-01-01

361

Dynamical and photometric investigation of comets  

NASA Technical Reports Server (NTRS)

The findings of dynamic and photometric investigations of comets are summarized, and include discussions of the comets Bennett 1970 II, Kohoutek 1973f, West 1976 VI, and periodic comets d'Arrest, Encke, and Swift Tuttle. The phenomena examined include striated and anomalous tails, tail composition and the dynamics of vaporizing dust particles, the evolution of dust jets, and split and dissipating comets.

Sekanina, Z.

1980-01-01

362

Bullying investigation reveals shocking levels of harassment.  

PubMed

AFTER CARE Quality Commission (CQC) inspectors recorded allegations last January of bullying among staff at Barts Health NHS Trust, London, the organisation took the unusual step of commissioning an independent investigation to find out exactly what was going on. PMID:25428304

Duffin, Christian

2014-11-27

363

An investigation into the microflora of heroin  

Microsoft Academic Search

In 2000, an unusual increase of morbidity and mortality among illegal injecting drug users in the UK and Ireland was reported and Clostridium novyi was identified as the likely source of the serious infection, although infections due to C. botulinum and Bacillus cereus were also reported. Because heroin was a possibile source of infection, this study investigated the microflora of

J. McLAUCHLIN; V. MITHANI; F. J. BOLTON; G. L. NICHOLS; M. A. BELLIS; Q. SYED; R. P. M. THOMSON; J. R. ASHTON

364

Native spring investigation data report. Final report  

Microsoft Academic Search

A series of native springs in the Indian Wells Valley were investigated by the Naval Air Weapons Station China Lake Environmental Project Office during FY 94 to gather baseline geophysical and geological data. Thirty-one native springs located in the north and south test ranges at China Lake were sampled for water quality. Air photographs of each spring site were taken

T. Bilhorn; J. Maas; S. Dickey; M. Stoner

1995-01-01

365

Investigating how terrain and watersheds are connected  

NSDL National Science Digital Library

In this activity students will gain an understanding of how terrain affects a watershed. Students will use maps and Google Earth to "get a picture" of the terrain within their watershed. They will use this knowledge to create an investigation of their stream which will help answer student generated questions about the connection of terrain and water systems.

Hamilton, Mick

366

Investigating Gender Stereotypes in Elementary Education  

Microsoft Academic Search

Education is home to one of America's most pervasive gender stereotypes. Adisproportionately low frequency of male elementary school teachers has reinforced such stereotypes. This study was designed to investigate gender stereotypes further. Forty-three undergraduate students answered questions assessing their attitudes and views towards four different fictitious teachers. The teacher descriptions were varied by gender and competency (incompetent versus competent). Competent

Matthew M. Calvanese

367

Experimental investigation of a flapping wing model  

Microsoft Academic Search

The main objective of this research study was to investigate the aerodynamic forces of an avian flapping wing model system. The model size and the flow conditions were chosen to approximate the flight of a goose. Direct force measurements, using a three-component balance, and PIV flow field measurements parallel and perpendicular to the oncoming flow, were performed in a wind

Tatjana Y. Hubel; Cameron Tropea

2010-01-01

368

Parametric investigations of a nonconventional Hall thruster  

Microsoft Academic Search

Hall thrusters might better scale to low power with nonconventional geometry. A 9 cm cylindrical, ceramic-channel, Hall thruster with a cusp-type magnetic field distribution has been investigated. It exhibits discharge characteristics similar to conventional coaxial Hall thrusters, but does not expose as much channel surface. Significantly, its operation is not accompanied by large amplitude discharge low frequency oscillations.

Y. Raitses; N. J. Fisch

2001-01-01

369

Teachers and Students Investigating Plants in Space  

NSDL National Science Digital Library

In this activity students will grow "AstroPlants," a special fast-growing plant used in Space Shuttle microgravity experiments. They will become familiar with the growth process and life cycle of the plants and investigate the effects of gravity and light on plant orientation and guidance.

370

Dig In! Hands-On Soil Investigations.  

ERIC Educational Resources Information Center

This guide is geared toward K-4 science teachers, supervisors, and environmental educators. The guide seeks to promote a better understanding and appreciation of soil. Students explore the land around them as they investigate the origins of soil and how it benefits our ecosystems and environment and discover the various habitats characterized by…

National Science Teachers Association, Arlington, VA.

371

INVESTIGATION Translation Initiation: A Regulatory Role  

E-print Network

INVESTIGATION Translation Initiation: A Regulatory Role for Poly(A) Tracts in Front of the AUG as the loading dock for ribosomes during translation initiation and is the key site for translation regulation to translation initiation factors to enhance translation initiation, but a long ($12) pre-AUG poly(A) tract

Xia, Xuhua

372

The Solar Oscillations Investigation - Michelson Doppler Imager  

Microsoft Academic Search

The Solar Oscillations Investigation (SOI) uses the Michelson Doppler Imager (MDI) instrument to probe the interior of the Sun by measuring the photospheric manifestations of solar oscillations. Characteristics of the modes reveal the static and dynamic properties of the convection zone and core. Knowledge of these properties will improve our understanding of the solar cycle and of stellar evolution. Other

P. H. Scherrer; R. S. Bogart; R. I. Bush; J. T. Hoeksema; A. G. Kosovichev; J. Schou; W. Rosenberg; L. Springer; T. D. Tarbell; C. J. Wolfson; I. Zayer

1995-01-01

373

An Empirical Investigation into Programming Language Syntax  

ERIC Educational Resources Information Center

Recent studies in the literature have shown that syntax remains a significant barrier to novice computer science students in the field. While this syntax barrier is known to exist, whether and how it varies across programming languages has not been carefully investigated. For this article, we conducted four empirical studies on programming…

Stefik, Andreas; Siebert, Susanna

2013-01-01

374

Numerical Investigation of Supersonic Nozzle Flow Separation  

E-print Network

as an undesirable occurrence, and showed that off-design nozzle thrust efficiency could be greatly improved the supersonic nozzle separation flow is important for designing efficient nozzle configuration that avoidsNumerical Investigation of Supersonic Nozzle Flow Separation Q. Xiao* and H.M. Tsai Temasek

Papamoschou, Dimitri

375

Numerical Investigation of Supersonic Nozzle Flow Separation  

E-print Network

to aircraft engine nozzles. When a supersonic nozzle is operated at pressure ratios well below its design of the separation location in rocket nozzles. A review paper by Morrisette and Goldberg [4], based on a varietyNumerical Investigation of Supersonic Nozzle Flow Separation Q. Xiao and H. M. Tsai National

Papamoschou, Dimitri

376

Investigating Ceiling Effects in Longitudinal Data Analysis  

ERIC Educational Resources Information Center

Score limitation at the top of a scale is commonly termed "ceiling effect." Ceiling effects can lead to serious artifactual parameter estimates in most data analysis. This study examines the consequences of ceiling effects in longitudinal data analysis and investigates several methods of dealing with ceiling effects through Monte Carlo simulations…

Wang, Lijuan; Zhang, Zhiyong; McArdle, John J.; Salthouse, Timothy A.

2008-01-01

377

Investigation of the Therac-25 Accidents  

Microsoft Academic Search

Between June 1985 and January 1987, the Therac-25 medical electron accelerator was involved in six massive radiation overdoses. As a result, several people died and others were seriously injured. A detailed investigation of the factors involved in the software-related overdoses and attempts by users, manufacturers, and government agencies to deal with the accidents is presented. The authors demonstrate the complex

Nancy G. Leveson; Clark Savage Turner

1993-01-01

378

Dielectric investigation of some woven fabrics  

Microsoft Academic Search

In this paper, we have investigated the temperature dependence of dielectric properties (relative dielectric permeabilities and dielectric tangents of losses) for woven fabrics of hemp, jute, flax, cotton, polyester (PES), cotton-PES mixture, and wool. The measurements have been carried out at a temperature range from -50 to 50 °C in the electric periodic field at a frequency 1 MHz in

Dragana D. Cerovic; Jablan R. Dojcilovic; Koviljka A. Asanovic; Tatjana A. Mihajlidi

2009-01-01

379

Dielectric investigation of some woven fabrics  

Microsoft Academic Search

In this paper, we have investigated the temperature dependence of dielectric properties (relative dielectric permeabilities and dielectric tangents of losses) for woven fabrics of hemp, jute, flax, cotton, polyester (PES), cotton-PES mixture, and wool. The measurements have been carried out at a temperature range from ?50 to 50 °C in the electric periodic field at a frequency 1 MHz in

Dragana D. Cerovic; Jablan R. Dojcilovic; Koviljka A. Asanovic; Tatjana A. Mihajlidi

2009-01-01

380

A Preliminary Investigation of Developable Dimensions  

Microsoft Academic Search

This article poses the question, what do researchers know about the developability of the dimensions commonly used in assessment centers? A brief review of the training and development literature is used to explore empirical evidence for the developability of 16 common managerial performance dimensions. A survey of 139 managers is used to investigate participants' perceptions regarding the developability of the

Alyssa Mitchell Gibbons; Deborah E. Rupp; Lori A. Snyder; A. Silke Holub; Sang Eun Woo

2006-01-01

381

Investigating social entrepreneurship: A multidimensional model  

Microsoft Academic Search

Social entrepreneurship is an emerging area of investigation within the entrepreneurship and not-for-profit marketing literatures. A review of the literature emerging from a number of domains reveals that it is fragmented and that there is no coherent theoretical framework. In particular, current conceptualizations of social entrepreneurship fail to adequately consider the unique characteristics of social entrepreneurs and the context within

Jay Weerawardena; Gillian Sullivan Mort

2006-01-01

382

Investigating Adolescent Stress and Body Image  

ERIC Educational Resources Information Center

Adolescent stress is clearly implicated in the development of mental health problems. However, its role in dysfunctional body image, which rises markedly in adolescence, has not been investigated. The present study examined the link between stress and body image, as well as self-esteem and depressive symptoms, in 533 high school students in grades…

Murray, Kristen M.; Byrne, Don G.; Rieger, Elizabeth

2011-01-01

383

Open-Ended Laboratory Investigations with Drosophila.  

ERIC Educational Resources Information Center

Background information, laboratory procedures (including matings performed), and results are presented for an open-ended investigation using the fruitfly Drosophila melanogaster. Once data are collected, students develop hypotheses to explain results as well as devise additional experiments to test their hypotheses. Calculation of chi-square for…

Mertens, Thomas R.

1983-01-01

384

Investigation of Multistage Approaches to Examination Timetabling  

E-print Network

MISTA 2013 Investigation of Multistage Approaches to Examination Timetabling Syariza Abdul Rahman to examination timetabling consist of multiple stages, in which a constructive approach is used for finding while performing multiple runs for examination timetabling. The empirical results over a well known

Bargiela, Andrzej

385

Advising as Servant Leadership: Investigating the Relationship  

ERIC Educational Resources Information Center

Advisors serve in many, often overlooked, roles. We investigated the supposition that McClellan (2007a) espoused between academic advising and servant leadership. Our hypotheses, that measures of servant leadership and developmental advising are correlated and that wisdom is the best predictor of developmental advising behaviors, were supported.…

Paul, W. Kohle; Smith, K. Courtney; Dochney, Brendan J.

2012-01-01

386

An experimental investigation of reusable requirements retrieval  

Microsoft Academic Search

Building a requirements library allows practitioners to better leverage reuse since they can work on the abstractions closer to the software system's initial concepts. However, little research has explored how to retrieve requirements profiles to answer user's queries to the library. This paper presents an experimental investigation of retrieving functional requirements profiles. We assessed the effect of two factors: basic

Anas Mahmoud; Nan Niu

2010-01-01

387

LAUSD's Business Services Center. An Investigative Report.  

ERIC Educational Resources Information Center

An investigative report examines the Los Angeles Unified School District's (LAUSD's) attempt to obtain emergency funding, following the Los Angeles earthquake, for its abandoned Business Services Center (BSC). It examines the LAUSD's declaration of emergency and the pursuit of emergency funds, the district's search for replacement office space,…

Armoudian, Maria

388

The Cassini Radio and Plasma Wave Investigation  

Microsoft Academic Search

The Cassini radio and plasma wave investigation is designed to study radio emissions, plasma waves, thermal plasma, and dust in the vicinity of Saturn. Three nearly orthogonal electric field antennas are used to detect electric fields over a frequency range from 1 Hz to 16 MHz, and three orthogonal search coil magnetic antennas are used to detect magnetic fields over

D. A. Gurnett; W. S. Kurth; D. L. Kirchner; G. B. Hospodarsky; T. F. Averkamp; P. Zarka; A. Lecacheux; R. Manning; A. Roux; P. Canu; N. Cornilleau-Wehrlin; P. Galopeau; A. Meyer; R. Boström; G. Gustafsson; J.-E. Wahlund; L. Åhlen; H. O. Rucker; H. P. Ladreiter; W. Macher; L. J. C. Woolliscroft; H. Alleyne; M. L. Kaiser; M. D. Desch; W. M. Farrell; C. C. Harvey; P. Louarn; P. J. Kellogg; K. Goetz; A. Pedersen

2004-01-01

389

Annual cycle energy system: Initial investigations  

Microsoft Academic Search

Initial analytical and experimental investigations were conducted to establish data and design procedures prior to a demonstration of the Annual Cycle Energy System (ACES) in an actual building. ACES is an integrated system for supplying space heating and cooling, and domestic hot water to a building through the use of a heat pump, a thermal storage unit, and an outdoor

H. C. Fischer; J. C. Christian; E. C. Hise; A. S. Holman; A. J. Miller; W. R. Mixon; J. C. Moyers; E. A. Nephew

1976-01-01

390

The GGS\\/POLAR magnetic fields investigation  

Microsoft Academic Search

The magnetometer on the POLAR Spacecraft is a high precision instrument designed to measure the magnetic fields at both high and low altitudes in the polar magnetosphere in 3 ranges of 700, 5700, and 47000 nT. This instrument will be used to investigate the behavior of fieldaligned current systems and the role they play in the acceleration of particles, and

C. T. Russell; R. C. Snare; J. D. Means; D. Pierce; D. Dearborn; M. Larson; G. Barr; G. Le

1995-01-01

391

Lab 2--Investigating Univariate Data Introduction  

E-print Network

="Histogram of Text Messages Yesterday", xlab="text messages") Note that we initially read in the data file classdata to your WORD. stem(data1[,2]) HOMEWORK [5]: Open the data file marriage_ages.csv and produce histogramLab 2--Investigating Univariate Data Introduction: In this lab we will read in some quantitative

Steele, Brian

392

INVESTIGATION Chromosomal Evolution and Patterns of  

E-print Network

INVESTIGATION Chromosomal Evolution and Patterns of Introgression in Helianthus Jessica G. Barb,*,1 John E. Bowers,* Sebastien Renaut, Juan I. Rey,,2 Steven J. Knapp,,3 Loren H. Rieseberg, and John M of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4 ABSTRACT Knowledge of the nature and extent

Burke, John M.

393

Investigating Convergence of Restricted Boltzmann Machine Learning  

E-print Network

with missing data and are used to pretrain deep learning machines. RBMs learn a generative model of the dataInvestigating Convergence of Restricted Boltzmann Machine Learning Hannes Schulz Andreas M Machines are increasingly popular tools for unsuper- vised learning. They are very general, can cope

Behnke, Sven

394

Using Ants to Investigate the Environment  

ERIC Educational Resources Information Center

The best place for students to begin to understand complex environmental relationships is in their own back yards. Doing investigations of ants allows students to establish a baseline survey of ant fauna, test the importance of ants in nutrient cycling and soil structure maintenance, and increase their understanding of the environment and their…

Hagevik, Rita A.

2005-01-01

395

Using Ants to Investigate the Environment  

Microsoft Academic Search

The best place for students to begin to understand complex environmental relationships is in their own back yards. Doing investigations of ants allows students to establish a baseline survey of ant fauna, test the importance of ants in nutrient cycling and soil structure maintenance, and increase their understanding of the environment and their impact on it. The three inquiry-based activities

Rita A Hagevik

2005-01-01

396

Magnetic field investigations on low cost missions  

Microsoft Academic Search

Magnetic fields pervade all of space and provide important diagnostic information on the nature of processes occurring within and around solar system objects. Thus magnetic investigations are frequently included on planetary missions. Since spacecraft subsystems can generate magnetic fields that may interfere with the measurement of the ambient field, magnetic cleanliness programs are usually instituted to minimize such extraneous magnetic

R. C. Snare; C.T. Russell

1995-01-01

397

Students' Investigation of a View Tube  

ERIC Educational Resources Information Center

The inquiry-based approach to learning has gained popularity in recent times. Those who promote this approach maintain that mathematical investigation should be used to engage students. The National Council of Teachers of Mathematics (NCTM) recommends that problem solving be the center of mathematics teaching in promoting student learning through…

Obara, Samuel

2010-01-01

398

An Investigation of Different String Coding Methods.  

ERIC Educational Resources Information Center

Investigates techniques for automatic coding of English language strings which involve titles drawn from bibliographic files, but do not require prior knowledge of source. Coding methods (basic, maximum entropy principle), results of test using 6,260 titles from British National Bibliography, and variations in code element ordering are…

Goyal, Pankaj

1984-01-01

399

Hydraulic Geometry: Empirical Investigations and Theoretical Approaches  

E-print Network

Hydraulic Geometry: Empirical Investigations and Theoretical Approaches B.C. Eatona, a Department of Geography, The University of British Columbia 1984 West Mall, Vancouver, BC, V6T 1Z2 Abstract Hydraulic. One approach to hydraulic geometry considers temporal changes at a single location due to variations

Eaton, Brett

400

INVESTIGATION QTL Mapping and Candidate Gene Analysis  

E-print Network

the median and mean telomere lengths from 178 recombinant inbred lines of the IBM mapping population and telomere length in the IBM population and diverse inbred lines by quantitative real-time PCR. A slightINVESTIGATION QTL Mapping and Candidate Gene Analysis of Telomere Length Control Factors in Maize

Ronquist, Fredrik

401

Pollock, Mondrian and Nature: Recent Scientific Investigations  

Microsoft Academic Search

The abstract paintings of Piet Mondrian and Jackson Pollock are traditionally regarded as representing opposite ends of the diverse visual spectrum of Modern Art. In this article, I present an overview of recent scientific research that investigates the enduring visual appeal of these paintings.

Richard Taylor

402

INVESTIGATION FOR 'SUPER-SORBENT' COMMERCIAL PROCESSING  

EPA Science Inventory

The report discusses making improved ('super-sorbent') calcium based sorbents commercially for EPA's LIMB (Limestone Injection in Multistage Burners) process for SO2 removal from coal-fired utility boilers. Two processes for making 'super-sorbents' were investigated: (1) precalci...

403

May 28, 2013 Dear Pediatric Investigators,  

E-print Network

May 28, 2013 Dear Pediatric Investigators, RE: Pediatric Clinical Research Trials The Food and Drug significant clarification provided by the FDA pertained to pediatric studies with more than one arm to which of a multiple arm pediatric trial. The most obvious and most common situation we expect to see

Puglisi, Joseph

404

A serious game for traffic accident investigators  

E-print Network

A serious game for traffic accident investigators 1. INTRODUCTION All new police officers recruited by Dubai Police go through the same training process, which consists of lectures and on-the-job training (designed for their specific rank category). The training is admin- istered by Dubai Police Academy which

Romano, Daniela

405

Investigating Water Problems. A Water Analysis Manual.  

ERIC Educational Resources Information Center

This booklet has been prepared expressly for teachers and students who are interested in investigating the quality of water supplies. The intent is to provide technical support and background information concerning water quality factors and to give basic information on field and laboratory water testing techniques. It is assumed that the reader is…

Renn, Charles E.

406

An investigation of the pattern scaling technique  

E-print Network

An investigation of the pattern scaling technique for describing future climates. Timothy D global climate models (GCMs). The patterns from GCMs were subsequently combined with simple climate model to regions, the identification of the pattern and the accuracy of the estimates relies less on the climatic

Feigon, Brooke

407

A multivariate investigation of dating aggression  

Microsoft Academic Search

This study investigated the following variables for their unique and combined contributions to dating aggression: exposure to aggression in the family of origin (witnessing interparental aggression or being the victim of aggressive parenting); attitudes justifying dating aggression (when humiliated or in selfdefense); child-to-parent aggression; child sexual abuse; violent sexual victimization; alcohol use; and socioeconomic status. One hundred and eleven male

Louise Foo; Gayla Margolin

1995-01-01

408

Welding of commercial base plates is investigated  

NASA Technical Reports Server (NTRS)

Investigation of aluminum alloy welds reveals that the combinations of metallic elements with hydrogen are not capable of producing weld porosity themselves, rather they tend to increase the amount of porosity only in the presence of arc contamination by water vapor.

Cheever, D. L.; Martin, D. C.; Mishler, H. W.; Monroe, R. E.

1968-01-01

409

Investigation of MEBES 4500 system composite performance  

Microsoft Academic Search

MEBES systems are characterized by constituent error performance, whereas masks produced on pattern generators are characterized by composite error performance. System evaluation by constituent specification is notable for the ease with which system calibration can be obtained, monitored, and maintained. Constituent specifications need to be retained for these reasons. This work investigates the composite performance of a MEBES 4500 system

Jim Dewitt; Joe Watson; David Alexander; Allen Cook; Leonard Gasiorek; Mark Mayse; Robert J. Naber; Wayne Phillips; Charles A. Sauer

1995-01-01

410

Magnetooptical investigations on thin ferromagnetic films  

Microsoft Academic Search

Various applications of the Faraday and Kerr effects for the investigation of domain structures and reversal mechanisms in thin ferromagnetic films are reviewed. Different optical arrangements for the observation of domains are described and compared. Using magnetooptic microscopy domains and wall structures can be observed with a resolution of 1 ?m. Magnetization structures give rise to diffraction phenomena, which are

M. Lambeck

1968-01-01

411

A Study of Investigating Child Abuse  

Microsoft Academic Search

Child abuse can take many forms. Such forms can include physical abuse, verbal abuse, sexual abuse, psychological abuse, neglect, and maltreatment. The child will almost always be questioned about the abuse. The way in which the police officers and the criminal justice system go about their investigation can affect the child. There are certain ways in which to question a

Bryan Cairnduff

2012-01-01

412

Coupled Ion Neutral Dynamic Investigation (CINDI) Introduction  

E-print Network

Investigation (CINDI) instrument set will examine the winds in charged and neutral gases that can affect from the Global Positioning System (GPS), must pass through this region and are affected by space to affect the path that radio waves follow through the region. Space weather properties are similar

413

Investigation of cryogenic treatment of UHMWPE  

Microsoft Academic Search

UHMWPE has been used as a bearing material in total joint arthroplasty for many years. Wear of UHMWPE can adversely affect the performance and longevity of orthopaedic implants. Various efforts have been focused on the improvement of UHMWPE properties, including wear resistance. In this study, a cryogenic treatment was investigated for potential improvements of UHMWPE. The cryogenic treatment applied in

H. H. Trieu; L. H. Morris; M. E. Kaufman; R. Hood; L. S. Jenkins

1997-01-01

414

RSRM Nozzle Anomalous Throat Erosion Investigation Overview  

NASA Technical Reports Server (NTRS)

In September, 1996, anomalous pocketing erosion was observed in the aft end of the throat ring of the nozzle of one of the reusable solid rocket motors (RSRM 56B) used on NASA's space transportation system (STS) mission 79. The RSRM throat ring is constructed of bias tape-wrapped carbon cloth/ phenolic (CCP) ablative material. A comprehensive investigation revealed necessary and sufficient conditions for occurrence of the pocketing event and provided rationale that the solid rocket motors for the subsequent mission, STS-80, were safe to fly. The nozzles of both of these motors also exhibited anomalous erosion similar to, but less extensive than that observed on STS-79. Subsequent to this flight, the investigation to identify both the specific causes and the corrective actions for elimination of the necessary and sufficient conditions for the pocketing erosion was intensified. A detailed fault tree approach was utilized to examine potential material and process contributors to the anomalous performance. The investigation involved extensive constituent and component material property testing, pedigree assessments, supplier audits, process audits, full scale processing test article fabrication and evaluation, thermal and thermostructural analyses, nondestructive evaluation, and material performance tests conducted using hot fire simulation in laboratory test beds and subscale and full scale solid rocket motor static test firings. This presentation will provide an over-view of the observed anomalous nozzle erosion and the comprehensive, fault-tree based investigation conducted to resolve this issue.

Clinton, R. G., Jr.; Wendel, Gary M.

1998-01-01

415

An Empirical Investigation of Trade Credit Demand  

Microsoft Academic Search

This paper investigates the motivations for a firm's demand for trade credit. Demand for credit is modelled as a function of transaction costs motivations, financing motivations, operational considerations, seller compliance issues and supplier marketing, whilst controlling for the firm's business environment and for firm characteristics such as size and industry. This paper builds on previous studies by considering a wider

Barbara Summers; Nicholas Wilson

2002-01-01

416

INVESTIGATION Genetic Analysis of Complex Interactions Among  

E-print Network

of the inner mitochondrial membrane, is critical for protein translocation into the matrix. Hsp70 is tethered is strictly dependent on a mem- brane potential across the inner membrane. However, translocationINVESTIGATION Genetic Analysis of Complex Interactions Among Components of the Mitochondrial Import

Craig, Elizabeth A

417

HARBOR ISLAND REMEDIAL INVESTIGATION, MARINE SEDIMENT  

EPA Science Inventory

The data set contains marine sediment data from a remedial investigation of Harbor Island, a National Priority List (NPL) Superfund site in Washington State. Both surface and subsurface marine sediments were collected. A station data set contain sampling station location and desc...

418

Investigation on lithium-polymer electrolyte batteries  

NASA Astrophysics Data System (ADS)

Lithium-polymer batteries using vanadium oxide-based composite electrodes and operating at moderate temperatures (˜90°C) have been investigated. The work was developed within the advanced lithium-polymer batteries for electric vehicles (ALPE) project, an Italian integrated project, devoted to the realization of lithium-polymer batteries for electric vehicle applications.

Appetecchi, G. B.; Alessandrini, F.; Carewska, M.; Caruso, T.; Prosini, P. P.; Scaccia, S.; Passerini, S.

419

Genetic Storms: Investigating the Gulf War Syndrome  

Microsoft Academic Search

Exploratory data analysis problems involving lots of data, but few hypotheses about them, are modeled as search problems over large unstructured spaces. For example, following the 1991 Persian Gulf conflict, medical evaluations of participants-conducted due to reports of a “Gulf War Syndrome”-have produced large amounts of medical data. This data, the basis for our investigation of the syndrome, ranges over

Hemant K. Bhargavat; David L. Jacobson

1997-01-01

420

Crime scene investigation (as seen on TV)  

Microsoft Academic Search

A mysterious green ooze is injected into a brightly illuminated and humming machine; 10s later, a printout containing a complete biography of the substance is at the fingertips of an attractive young investigator who exclaims “we found it!” We have all seen this event occur countless times on any and all of the three CSI dramas, Cold Cases, Crossing Jordans,

Evan W. Durnal

2010-01-01

421

Investigation of the performance of linings  

Microsoft Academic Search

Purpose – To investigate the performance of linings in clothing. Design\\/methodology\\/approach – A total of 24 lining fabrics were produced in different constructions. 150 denier 350 twist\\/cm filament polyester warp yarn was used for all of the fabrics. Two different weft yarns (textured, filament) were used to produce lining fabrics in three different densities. Findings – In the garment sector,

Fatma Kalaoglu; Binnaz Meric

2005-01-01

422

ORIGINAL ARTICLE Investigation of archaeal and bacterial  

E-print Network

as an ingredient to improve the taste of other foods, such as kimchi, a famous fermented vegetable product of KoreaORIGINAL ARTICLE Investigation of archaeal and bacterial diversity in fermented seafood using, Seoul, Republic of Korea Little is known about the archaeal diversity of fermented seafood; most

Bae, Jin-Woo

423

Accessible experts are here to serve investigators  

E-print Network

it Investigators: Need Access to Technology Outside Your Lab? OHSU's cores are your campus technology partners: koopd@ohsu.edu | (503) 494-7806 | www.ohsu.edu/bsrpk DNA Services - Automated fluorescent "long read For a complete listing of your local OHSU University Shared Resource Cores (USR), visit: www.ohsu.edu/cores #12;

Chapman, Michael S.

424

AN INVESTIGATION OF COLLISIONLESS PLASMA BEAM INTERACTION  

E-print Network

AN INVESTIGATION OF COLLISIONLESS PLASMA BEAM INTERACTION WITH A NONHOMOGENEOUS MAGNETIC FIELD of Philosophy California Institute of Technology Pasadena, California 1973 (Submitted May 18, 1973) #12;ii of Technology who provided me with financial support throughout this endeavor. Acknowledgement is due to the U

Desbrun, Mathieu

425

Investigating Bias and Incentives in Social Media  

E-print Network

and policy influences App design and affordances Individual preferences and motivations #12;Social Media. Passed law penalizing use of social media to spread misinformation. "Twitteroristas" #12;Chilling EffectInvestigating Bias and Incentives in Social Media Emre Kiciman, emrek@Microsoft.com Includes joint

Hunt, Galen

426

Surface analytical investigations at Sandia Labs. \\/Albuquerque  

Microsoft Academic Search

An overview is given of some projects which (1) have used surface analytical techniques in a conventional way to investigate specific surface-related problems; (2) have utilized surface studies to get a more fundamental understanding of the operations of various devices and components, and of the factors that determine such parameters as the lifetime and reliability of such devices; and (3)

1978-01-01

427

Investigations for a Mobile Environmental Education Laboratory.  

ERIC Educational Resources Information Center

Envirpnmental investigations in this compilation were developed in conjunction with the establishment of a mobile environmental education laboratory, a demonstration project of the Kingsport (Tennessee) City School System. The 50 activities are divided into five categories: basic resources, environmental problems, living organisms, community…

Childress, Ronald B.

428

Investigation of two-body abrasive wear  

Microsoft Academic Search

An investigation of two-body abrasive wear utilizing a pin specimen on a rotating SiC particle abrasive paper test device is described. The test materials were 7075 aluminum and 4340 steel which were thermally treated to attain a range of hardness, fracture toughness and yield strength values. Wear resistance is seen to correlate directly with hardness and yield strength for both

H. H. Hirano; A. V. Levy

1978-01-01

429

Spill Sleuths: An Interdisciplinary Environmental Health Investigation  

ERIC Educational Resources Information Center

"We are on the eve of total contamination," said an eighth grade "toxicologist" at a mock town meeting at Mount Baker Middle School in Mount Vernon, Washington. The meeting was the culmination of a month-long investigation by students to determine why some of the townspeople were getting sick. During the unit, students used skills from several…

Rudensey, Lyle; Whidden, Jeff

2005-01-01

430

Investigating Probability with the NBA Draft Lottery.  

ERIC Educational Resources Information Center

Investigates an interesting application of probability in the world of sports. Considers the role of permutations in the lottery system used by the National Basketball Association (NBA) in the United States to determine the order in which nonplayoff teams select players from the college ranks. Presents a lesson on this topic in which students work…

Quinn, Robert J.

1997-01-01

431

Original Research Investigation of Acupoint Specificity by  

E-print Network

Original Research Investigation of Acupoint Specificity by Multivariate Granger Causality Analysis (deqi sensations) were also assessed. Finally, a newly mul- tivariate Granger causality analysis (m at three acupoints. Results: Following acupuncture at PC6, the red nucleus and substantia nigra emerged

Tian, Jie

432

Sexual bondage: A review and unobtrusive investigation  

Microsoft Academic Search

To investigate unobtrusively how individuals experience sexual bondage, we analyzed all messages about sexual bondage (N =514) mailed to an international computerized discussion group on sexual bondage in 1990. The most frequent individual experience reported (n =60) was playful use of bondage to explore new areas of sexual pleasure. Other frequent experiences were the exchange of power, intensified sexual pleasure,

Kurt E. Ernulf; Sune M. Innala

1995-01-01

433

ORIGINAL INVESTIGATION Tonic dopamine: opportunity costs  

E-print Network

ORIGINAL INVESTIGATION Tonic dopamine: opportunity costs and the control of response vigor Yael Niv that the average reward rate is reported by tonic levels of dopamine putatively in the nucleus accumbens and com- putationally inspired ideas about the role of tonic dopamine in striatum, explaining from

Niv, Yael

434

A Program for Training Physician-Investigators.  

ERIC Educational Resources Information Center

A Pittsburgh program to encourage physicians to choose clinical investigation careers consists of nine months of formal lectures and laboratory training and 15 months of a supervised laboratory research project. The curriculum ranges from basic laboratory techniques and biomedical content to advanced instrumentation, statistical analysis, computer…

Lehotay, Denis C.; And Others

1982-01-01

435

Investigation of Solder Fatigue Acceleration Factors  

Microsoft Academic Search

Solder fatigue was investigated experimentally for effects of the strain loading waveform in isothermal mechanical fatigue, and frequency and strain range in true thermal cycling. Rapid strain loading followed by a long hold period at constant strain was found to be very damaging compared to constant rate cycling at the same peak amplitude and period. Thermal cycle fatigue data showed

L. R. FOX; J. W. SOFIA; M. C. SHINE

1985-01-01

436

Investigating Contingency Awareness Using Atari 2600 Games  

E-print Network

and review- ing related reinforcement learning work on video games. The Atari 2600 was a popular second to the Atari 2600. While these games are consid- erably simpler than modern video games, they remain chalInvestigating Contingency Awareness Using Atari 2600 Games Marc G. Bellemare and Joel Veness

Bowling, Michael

437

Korean Books and FRBR: An Investigation  

ERIC Educational Resources Information Center

Purpose: The purpose of this study is to investigate the characteristics of Korean books by analysing their "work types" based on the Functional Requirements for Bibliographic Records (FRBR) model. Design/methodology/approach: A total of 1,000 Korean books were randomly chosen from the Korean National Bibliography (KNB) 2008 at the National…

Kim, Jeong-Hyen; Moon, Ji-Hyun

2010-01-01

438

Investigation of electrons interaction in a superconductor  

E-print Network

Investigating the interaction of electrons in a superconductor by means of a method of solitary waves of Korteweg - de Vries, we refute the claim of absence of "Cooper pairs" in a superconductor. We also indicate that the nondissipative transfer of energy in the superconductor is possible only with the help of a pair of electrons.

Iogann Tolbatov

2009-10-21

439

ORIGINAL INVESTIGATION Consequences of Comorbid Insomnia Symptoms  

E-print Network

ORIGINAL INVESTIGATION Consequences of Comorbid Insomnia Symptoms and Sleep-Related BreathingD Background: The prevalence of sleep-related breath- ing disorder (SRBD) and insomnia symptoms increases).Participants were divided into 4 groups--with and without insomnia and with and without SRBD--and the groups

Pennsylvania, University of

440

Outshopping Through the Internet: A Multicountry Investigation  

Microsoft Academic Search

From the viewpoint of trade leakage for local retailers, Internet shopping bears a similarity to traditional outshopping, in the tendency to shop outside the consumer's immediate shopping areas. Yet, the relationship between consumer outshopping?related characteristics and preference for Internet shopping has received little, if any, research attention. We investigate this relationship using survey data from consumers in three countries—the United

Dongdae Lee; Audhesh K. Paswan; Gopala Ganesh; M. J. Xavier

2009-01-01

441

Investigative Studies of Plasma Torch Hazards  

Microsoft Academic Search

Potential health hazards from a medium output plasma torch used in a biological laboratory were investigated, and some industrial applications of higher output plasma torches were surveyed. Exposures to intense ultraviolet radiation, noise, and noxious gases and fumes were measured. Biological experiments on animals and human skin were performed to evaluate the reaction to ultraviolet energy, and thermocouples were used

Charles H. Powell; Leon Goldman; Marcus M. Key

1968-01-01

442

From Sances to Science: Investigating Psychic  

E-print Network

From Séances to Science: Investigating Psychic Phenomena with Statistics Jessica Utts Department on statistical analysis #12;Psi/Psychic/ESP/Anomalous Cognition Having information that could not have been, and hopefully, an explanation of how and why something works. #12;Controlled Experiments to Test Psychic

Utts, Jessica

443

AFTER DIVORCE:Investigations into Father Absence  

Microsoft Academic Search

On the basis of in-depth interviews with 75 divorced New York fathers, the phenomenon of postdivorce paternal absence is investigated. The accounts provided by the interviewees suggest that father absence is more than a literal practice: it is also a perceived option and a standard of comparison. Father absence is a strategy of action, the objective of which is to

TERRY ARENDELL

1992-01-01

444

Investigation of Inhalation Anthrax Case, United States  

PubMed Central

Inhalation anthrax occurred in a man who vacationed in 4 US states where anthrax is enzootic. Despite an extensive multi-agency investigation, the specific source was not detected, and no additional related human or animal cases were found. Although rare, inhalation anthrax can occur naturally in the United States. PMID:24447835

Blaney, David; Shadomy, Sean; Lehman, Mark; Pesik, Nicki; Tostenson, Samantha; Delaney, Lisa; Tiller, Rebekah; DeVries, Aaron; Gomez, Thomas; Sullivan, Maureen; Blackmore, Carina; Stanek, Danielle; Lynfield, Ruth

2014-01-01

445

CLINICAL INVESTIGATIONS Computed Tomographic Angiography for  

E-print Network

CLINICAL INVESTIGATIONS Computed Tomographic Angiography for the Evaluation of Aneurysmal involving a limited number of patients. The authors sought to assess the ability of CT angiography (CTA:486­492 ª 2006 by the Society for Academic Emergency Medicine Keywords: computed tomography, CT angiography

446

INVESTIGATION Common Variants of Drosophila melanogaster  

E-print Network

INVESTIGATION Common Variants of Drosophila melanogaster Cyp6d2 Cause Camptothecin Sensitivity affect an organism's response to chemotherapeutic drugs. In this study, we focused on camptothecin that result in extreme sensitivity to camptothecin but not top- otecan or irinotecan. We confirmed

McVey, Mitch

447

A Systems Approach to Investigating Interpersonal Strife.  

ERIC Educational Resources Information Center

Investigated the relationships between computer-simulated, in-vitro interactional personality behavior and various indices of interpersonal relationships using data collected from 31 families. Analysis showed that strife was allied most closely with rigid, unstable interpersonal interactions. Concluded that the systems approach offers a unique,…

Kunce, Joseph T.; And Others

1984-01-01

448

MATERIAL TRANSFER FORM A. Principal Investigator  

E-print Network

MATERIAL TRANSFER FORM A. Principal Investigator Name: Academic Rank: Tel: Department / Unit:Fax: Faculty:Email: B. Other Party Sending or Receiving the Material Organization: Address: Contact Name: Tel: Fax: Email: C. Material and Research Project #103-6190 Agronomy Road, Vancouver, BC V6T 1Z3 Address

Ollivier-Gooch, Carl

449

Performance investigation of a combined MCFC system  

Microsoft Academic Search

This study investigates the performance of a combined industrial molten carbonate fuel cell (MCFC) system, including a turbo expander, which was recently installed by Enbridge Inc. in Toronto, Canada. It entails a comprehensive thermodynamic analysis regarding energy and exergy calculations, subject to varying operating conditions. Furthermore, a simplified and novel method is used for a cost analysis to assess the

R. Rashidi; P. Berg; I. Dincer

2009-01-01

450

Privacy in Criminal Investigations — A Survey  

Microsoft Academic Search

Governmental authorities should have the power to infringe the privacy of citizens in order to investigate crime. That opinion is prevailing and uncontroversial in most Western countries. Less articulate and more controversial in these societies, however, are ideas about the extent to which the authorities should be allowed to pursue infringements on the privacy of citizens. Naturally, opinions of citizens

Bert-Jaap Koops; Anton Vedder

2002-01-01

451

Evidence-Based Practice in Criminal Investigations  

Microsoft Academic Search

In the face of the explosion of information and research, criminal investigative practices and procedures remain little changed except through the opportunities of specialized experiences, training, and educational efforts over the last forty years. Whether one speaks to college texts, opportunities offered by regional training alliances, inter and intra agency sharing or the contributions of federal agency instructional opportunities, the

Janet McClellan

2008-01-01

452

CEO turnover and compensation: An empirical investigation  

Microsoft Academic Search

CEO turnover events provide a unique opportunity for boards of directors to restructure CEO compensation packages. Consequently, changes and\\/or adjustments to CEO compensation packages under such circumstances can prove informative to the ongoing debate regarding CEO compensation. This paper investigates the nature of CEO compensation by exploring what happens to such compensation when a management turnover event takes place. Specifically,

Rachel L Graefe-Anderson

2009-01-01

453

Geologic History Field Investigation - Minnehaha Falls  

NSDL National Science Digital Library

This activity is an inquiry-based field investigation of the geologic history of the Minnehaha Falls and St. Anthony Falls areas of Minneapolis. Students will be introduced to rocks and the stories rocks tell in a genuine geologic context, rather than as samples in the classroom.

Kevin Swanson and Justin Larson, Chippewa Middle School, North Oaks, MN

454

Investigating Diffusion of Molecules in Liquid  

NSDL National Science Digital Library

This activity is a guided inquiry of how molecules move in liquid. Students develop questions, use their observation skills to describe what they saw, record and analyze their findings, and use their data to begin to hypothesize what is happening in the investigation.

Jean Karschnia Valley Crossing Community School Woodbury, Mn

455

Latent Semantic Analysis for German literature investigation  

E-print Network

Latent Semantic Analysis for German literature investigation Preslav Nakov Sofia University, Rila Semantic Analysis The Latent Semantic Analysis (LSA) is a powerful statistical technique for indexing for automatically discovery of the texts from the same author and to discriminate between prose and poetry. 2 Latent

Hearst, Marti

456

Simulation investigation of wind turbine imbalance faults  

Microsoft Academic Search

This paper investigates the use of simulations to study wind turbine imbalance faults. The dynamics of a model wind turbine generator (WTG) are simulated in a combined environment of TurbSim, FAST (Fatigue, Aerodynamics, Structures, Turbulence), and Simulink in three different scenarios, i.e., normal operating conditions, blade imbalance, and aerodynamic asymmetry. The blade imbalance is simulated by scaling the mass density

Xiang Gong; Wei Qiao

2010-01-01

457

Hydrogeological Investigations in the Pampa of Argentina  

NASA Technical Reports Server (NTRS)

The author has identified the following significant results. Satellite imagery in combination with ground investigations allows the identification and delineation of the near surface ground water (depth to ground water, salinity). The degree of precision achieved is greater than that obtainable by conventional ground survey methods alone.

Bannert, D.; Bender, H.; Kantor, W.; Kruck, W. (principal investigators)

1975-01-01

458

Hydrogeological investigations in the Pampa of Argentina  

NASA Technical Reports Server (NTRS)

The author has identified the following significant results. Satellite imagery in combination with ground investigations allows identification and delineation of differences in the conditions of the near surface ground water (depth to ground water, salinity). The degree of precision achieved is greater than that obtainable by conventional ground survey methods alone.

Bannert, D. (principal investigators); Bender, H.; Kruck, W.; Lago, J. J.

1974-01-01

459

Linguistic Investigations into Ellipsis in Classical Sanskrit  

NASA Astrophysics Data System (ADS)

Ellipsis is a common phenomenon of Classical Sanskrit prose. No inventory of the forms of ellipsis in Classical Sanskrit has been made. This paper presents an inventory, based both on a systematic investigation of one text and on examples based on sundry reading.

Gillon, Brendan S.

460

GAMMA-RADIOMETRIC INVESTIGATIONS OF REACTOR SHIELDING  

Microsoft Academic Search

The testing of reactor shielding using scintillation counters and gamma-; ray sources has proved a cheaper and less time-consuming method for thick walls ; than radiography with Co⁶° and film. In investigations carried out up to ; now on thick lead shields the average defect has amounted to about 2%. The ; position of the defect is clearly marked on

Somer

1960-01-01

461

Scientific Investigations of Elementary School Children  

ERIC Educational Resources Information Center

The study provides evidence concerning elementary school children's ability to conduct a scientific investigation. Two hundred and fifty sixth-grade students and 248 fourth-grade students were administered a test, and based on their performance, they were classified into high-ability and low-ability students. The sample of this study was…

Valanides, Nicos; Papageorgiou, Maria; Angeli, Charoula

2014-01-01

462

Investigating sports coaching pedagogies in games contexts  

E-print Network

and Garratt (2008) � Importance of pedagogy � Jones (2006) � Opaque practice � Light and Evans (2010Investigating sports coaching pedagogies in games contexts Don Vinson Ali Croad Simon Padley Abbe in further understanding pedagogic practice #12;Profile 1: Fred � Professional Coach � Coaching environment

463

Investigating Flight with a Toy Helicopter  

NASA Astrophysics Data System (ADS)

Flight fascinates people of all ages. Recent advances in battery technology have extended the capabilities of model airplanes and toy helicopters. For those who have never outgrown a childhood enthusiasm for the wonders of flight, it is possible to buy inexpensive, remotely controlled planes and helicopters. A toy helicopter offers an opportunity to investigate and study some basics of flight.

Liebl, Michael

2010-10-01

464

New Book Helps Students Investigate Energy  

ERIC Educational Resources Information Center

Energy is a valuable resource that comes in many different forms. In "Energy: 25 Projects Investigate Why We Need Power and How We Get It" kids ages 9-12 learn about the history and science of the world's sources of energy, from nonrenewable fossil fuels such as coal, oil, and natural gas to renewable energy sources such as solar and wind power.…

Curriculum Review, 2009

2009-01-01

465

Investigations in Marine Chemistry: Salinity II.  

ERIC Educational Resources Information Center

Presented is a science activity in which the student investigates methods of calibration of a simple conductivity meter via a hands-on inquiry technique. Conductivity is mathematically compared to salinity using a point slope formula and graphical techniques. Sample solutions of unknown salinity are provided so that the students can sharpen their…

Schlenker, Richard M.

466

Phenology and Biology of Climate Change Investigation  

NSDL National Science Digital Library

This lesson is an investigation of the impact of climate change on the phenology of a variety of taxa, including migrating birds and hibernating animals in the Colorado Rockies. Students analyze 40 years of data collected by Billy Barr from the Rocky Mountain Biological Laboratory.

Digital RMBL (Rocky Mountain Biological Laboratory)

467

Investigating Our Environment. Science: Grade 6.  

ERIC Educational Resources Information Center

Intended mainly for use in the intermediate grades, this document provides demonstrations, field trips and laboratory experiences designed to help students investigate the role that people play in problems associated with environmental quality, pollution, and ecology in general. The book was developed as an alternative program to the regular sixth…

New York City Board of Education, Brooklyn, NY. Bureau of Curriculum Development.

468

Research Investigation of Information Access Methods  

ERIC Educational Resources Information Center

This study investigates the satisfaction of library users at Wayne State University who utilize alternative information access methods. The LibQUAL+[TM] desired and perceived that satisfaction ratings are used to determine the user's "superiority gap." By focusing limited library resources to address "superiority gap" issues identified by each…

Heinrichs, John H.; Sharkey, Thomas W.; Lim, Jeen-Su

2006-01-01

469

Experimental investigation of beryllium: plans and current  

E-print Network

1 Experimental investigation of beryllium: plans and current results within the Ra;3 Beryllium is a promising candidate because of: · good "nuclear" properties; · appropriate mechanical will Beryllium be used? Application Operating conditions Proton beam parametersAvg. T (°C) Peak T (°C) Total DPA

McDonald, Kirk

470

76 FR 79567 - Tribal Background Investigations and Licensing  

Federal Register 2010, 2011, 2012, 2013

...resources and technology to make this...background investigation procedures...background investigations, the requirements...to civil, criminal or regulatory investigations or prosecutions...Complete a new...

2011-12-22

471

Planetological investigations or investigations of selected Martian regions using primarily Mariner 9 data  

NASA Technical Reports Server (NTRS)

Comparative planetological analyses of cratering and geomorphological processes were researched, with emphasis on the Martian surface. Asteroid fragmentation processes and collisional evolution were also investigated.

1977-01-01

472

Investigating Dynamics of Eccentricity in Turbomachines  

NASA Technical Reports Server (NTRS)

A methodology (and hardware and software to implement the methodology) has been developed as a means of investigating coupling between certain rotordynamic and hydrodynamic phenomena in turbomachines. Originally, the methodology was intended for application in an investigation of coupled rotordynamic and hydrodynamic effects postulated to have caused high synchronous vibration in the space shuttle s high-pressure oxygen turbopump (HPOTP). The methodology can also be applied in investigating (for the purpose of developing means of suppressing) undesired hydrodynamic rotor/stator interactions in turbomachines in general. The methodology and the types of phenomena that can be investigated by use of the methodology are best summarized by citing the original application as an example. In that application, in consideration of the high synchronous vibration in the space-shuttle main engine (SSME) HPOTP, it was determined to be necessary to perform tests to investigate the influence of inducer eccentricity and/or synchronous whirl motion on inducer hydrodynamic forces under prescribed flow and cavitation conditions. It was believed that manufacturing tolerances of the turbopump resulted in some induced runout of the pump rotor. Such runout, if oriented with an inducer blade, would cause that blade to run with tip clearance smaller than the tip clearances of the other inducer blades. It was hypothesized that the resulting hydraulic asymmetry, coupled with alternating blade cavitation, could give rise to the observed high synchronous vibration. In tests performed to investigate this hypothesis, prescribed rotor whirl motions have been imposed on a 1/3-scale water-rig version of the SSME LPOTP inducer (which is also a 4-biased inducer having similar cavitation dynamics as the HPOTP) in a magnetic-bearing test facility. The particular magnetic-bearing test facility, through active vibration control, affords a capability to impose, on the rotor, whirl orbits having shapes and whirl rates prescribed by the user, and to simultaneously measure the resulting hydrodynamic forces generated by the impeller. Active control also made it possible to modulate the inducer-blade running tip clearance and consequently effect alternating blade cavitation. The measured hydraulic forces have been compared and correlated with shroud dynamic-pressure measurements.

Baun, Daniel

2010-01-01

473

Physical properties of single water trees extracted from field aged cables  

Microsoft Academic Search

The long-term degradation phenomenon called water treeing is still of concern in polymeric insulated medium voltage cables. To get a better understanding of this ageing effect we investigated the physical properties of single water trees extracted from field aged cables. We will present measurements of the permittivity, the water content and the I-V-characteristics of single vented trees. The real part

F. Stucki; J. Rhyner

1994-01-01

474

The solar oscillations investigation: Michelson Doppler imager  

NASA Technical Reports Server (NTRS)

The Solar Oscillations Investigation (SOI) developed the Michelson Doppler Imager (MDI) to investigate the properties of the solar interior using the tools of helioseismology and of the photosphere and corona using more conventional techniques. The fundamental goal is to understand the Sun by determining its structure and observing its dynamics. The basic observables, velocity, intensity, and magnetic field, are computed on board from up to twenty 1024 by 1024 filtergrams made each minute. Subsequent analysis will extend the region to be explored downward into the solar interior and upward into the corona. While the instrument is dedicated to producing an uninterrupted series of helioseismology data, several magnetograms will be made each day and special eight hour campaigns are being developed to address specific scientific questions, some in coordination with other SOHO (Solar and Heliospheric Observatory) instruments.

Hoeksema, J. Todd; Scherrer, P. H.; Bush, R. I.; Title, A.; Tarbell, T.

1992-01-01

475

Investigations of respiratory control systems simulation  

NASA Technical Reports Server (NTRS)

The Grodins' respiratory control model was investigated and it was determined that the following modifications were necessary before the model would be adaptable for current research efforts: (1) the controller equation must be modified to allow for integration of the respiratory system model with other physiological systems; (2) the system must be more closely correlated to the salient physiological functionings; (3) the respiratory frequency and the heart rate should be expanded to illustrate other physiological relationships and dependencies; and (4) the model should be adapted to particular individuals through a better defined set of initial parameter values in addition to relating these parameter values to the desired environmental conditions. Several of Milhorn's respiratory control models were also investigated in hopes of using some of their features as modifications for Grodins' model.

Gallagher, R. R.

1973-01-01

476

NASA Heavy Lift Rotorcraft Systems Investigation  

NASA Technical Reports Server (NTRS)

The NASA Heavy Lift Rotorcraft Systems Investigation examined in depth several rotorcraft configurations for large civil transport, designed to meet the technology goals of the NASA Vehicle Systems Program. The investigation identified the Large Civil Tiltrotor as the configuration with the best potential to meet the technology goals. The design presented was economically competitive, with the potential for substantial impact on the air transportation system. The keys to achieving a competitive aircraft were low drag airframe and low disk loading rotors; structural weight reduction, for both airframe and rotors; drive system weight reduction; improved engine efficiency; low maintenance design; and manufacturing cost comparable to fixed-wing aircraft. Risk reduction plans were developed to provide the strategic direction to support a heavy-lift rotorcraft development. The following high risk areas were identified for heavy lift rotorcraft: high torque, light weight drive system; high performance, structurally efficient rotor/wing system; low noise aircraft; and super-integrated vehicle management system.

Johnson, Wayne; Yamauchi, Gloria K.; Watts, Michael E.

2005-01-01

477

The investigation of tethered satellite system dynamics  

NASA Technical Reports Server (NTRS)

The analysis of the rotational dynamics of the satellite was focused on the rotational amplitude increase of the satellite, with respect to the tether, during retrieval. The dependence of the rotational amplitude upon the tether tension variation to the power 1/4 was thoroughly investigated. The damping of rotational oscillations achievable by reel control was also quantified while an alternative solution that makes use of a lever arm attached with a universal joint to the satellite was proposed. Comparison simulations between the Smithsonian Astrophysical Observatory and the Martin Marietta (MMA) computer code of reteival maneuvers were also carried out. The agreement between the two, completely independent, codes was extremely close, demonstrating the reliability of the models. The slack tether dynamics during reel jams was analytically investigated in order to identify the limits of applicability of the SLACK3 computer code to this particular case. Test runs with SLACK3 were also carried out.

Lorenzini, E. C.

1986-01-01

478

Investigation on the doping of Polyacetylene Films  

NASA Astrophysics Data System (ADS)

We have investigated the oxydation and iodination of (CH)x-films and found that iodine doped samples degrade in oxygen at a lower rate than pure samples. The iodination can be described as a diffusion process, the diffusion constant being D ? 10-14 - 10-13 cm2/sec. This value for D is by many orders of magnitude smaller than those normally encountered for diffusion of gases in polymers. The insulator-metal transition, observed at high iodine concentrations, was investigated by optical transmission measurements. The results show that the forbidden gap remains roughly unaffected if the conductivity changes from the semiconducting to the metallic state. Also, below the gap a peak in absorption builds up with increasing iodine concentration but no absorption characteristic for free carriers is observed. These experimental observations are of importance for the selection of models which are to describe the insulator-metal transition and some consequences hereof are discussed.

Kiess, H.; Meyer, W.; Baeriswyl, D.; Harbeke, G.

1980-07-01

479

Investigation of multilayer magnetic domain lattice file  

NASA Technical Reports Server (NTRS)

A theoretical and experimental investigation determined that current accessed self structured bubble memory devices have the potential of meeting projected data density and speed requirements. Device concepts analyzed include multilayer ferrimagnetic devices where the top layer contains a domain structure which defines the data location and the second contains the data. Current aperture and permalloy assisted current propagation devices were evaluated. Based on the result of this work more detailed device research was initiated. Detailed theoretical and experimental studies indicate that the difference in strip and threshold between a single bubble in the control layer and a double bubble which would exist in both the control layer and data layer is adequate to allow for detection of data. Detailed detector designs were investigated.

Torok, E. J.; Kamin, M.; Tolman, C. H.

1982-01-01

480

Nonmammalian model systems to investigate fungal biofilms.  

PubMed

Medical advances have resulted in an increase in the number of patients in immunocompromised states, vulnerable to infection, or individuals fitted with medical devices that form niches for microbial infections. These infections are difficult to treat and have significant morbidity and mortality rates. An important factor in the pathogenesis of fungal diseases is the development of biofilm-forming communities, enabling the invasion of host tissues and resistance to antimicrobial compounds. To investigate the genetic requirements for filamentation and seek compounds that inhibit the process, invertebrate hosts are employed as models of in vivo infection. The purpose of our review is to highlight methods that can be utilized to investigate fungal filamentation, an important step in the development of biofilms, in the invertebrate hosts Galleria mellonella, Caenorhabditis elegans, and Drosophila melanogaster. PMID:24664832

Arvanitis, Marios; Fuchs, Beth Burgwyn; Mylonakis, Eleftherios

2014-01-01

481

Theoretical Investigation of Guide Wave Flowmeter  

NASA Astrophysics Data System (ADS)

Cylindrical pipes are widely used in industries such as nuclear power plants and micro total analysis systems (?TAS). Measuring the flow rate of fluid in such pipes is critical. Ultrasonic flowmeters are noncontact, nondestructive, and easy-to-use devices, and are therefore widely used. However, typical bulk-wave-based ultrasonic flowmeters cannot be used for pipes narrower than the wavelength of bulk waves. For such pipes, we are currently developing a “guide wave flowmeter” that uses guide waves instead of bulk waves. Previously, we theoretically and experimentally investigated a pipe filled with quiescent fluid for all modes [Jpn. J. Appl. Phys. 45 (2006) 4573]. In this study, we expanded our theoretical investigation to a cylindrical pipe containing flowing fluid, and then compared the results with experimental results. Both the theoretical and experimental results revealed that the flow rate can be determined by measuring the sound velocity (propagation time) of guide waves. This is the operating principle of our guide wave flowmeter.

Sato, Harumichi; Lebedev, Maxim; Akedo, Jun

2007-07-01

482

Investigating mechanisms of myopia in mice  

PubMed Central

While genetic and environmental factors have been shown to control visually-guided eye growth and influence myopia development, investigations into the intersection of these two factors in controlling refractive development have been limited by the lack of a genetically modifiable animal model. Technological advances have now made it possible to assess refractive state and ocular biometry in the small mouse eye and therefore to exploit the many genetic mouse mutants to investigate mechanisms of visually-guided eye growth. This review considers the benefits and challenges of studying refractive development in mice, compares the results of refractive error and ocular biometry from wild-type strains and genetic models in normal laboratory visual environments or with disrupted visual input, and discusses some of the remaining challenges in interpreting data from the mouse to validate and standardize methods between labs. PMID:23305908

Pardue, Machelle T.; Stone, Richard A.; Iuvone, P. Michael

2013-01-01

483

An investigation of ride quality rating scales  

NASA Technical Reports Server (NTRS)

An experimental investigation was conducted for the combined purposes of determining the relative merits of various category scales for the prediction of human discomfort response to vibration and for determining the mathematical relationships whereby subjective data are transformed from one scale to other scales. There were 16 category scales analyzed representing various parametric combinations of polarity, that is, unipolar and bipolar, scale type, and number of scalar points. Results indicated that unipolar continuous-type scales containing either seven or nine scalar points provide the greatest reliability and discriminability. Transformations of subjective data between category scales were found to be feasible with unipolar scales of a larger number of scalar points providing the greatest accuracy of transformation. The results contain coefficients for transformation of subjective data between the category scales investigated. A result of particular interest was that the comfort half of a bipolar scale was seldom used by subjects to describe their subjective reaction to vibration.

Dempsey, T. K.; Coates, G. D.; Leatherwood, J. D.

1977-01-01

484

Performance investigation of finned tube condensers  

SciTech Connect

A computer program has been developed to optimize the performance of finned tube condensers. The developed program is used to predict the thermal and hydrodynamic performance of finned tube condensers. The model is based on a steady-state finite difference model. The correlations for predicting the heat transfer and pressure drop are used from the literature. In this paper, the performance of a condenser of a 2-1/2 ton residential air conditioning system (split type) is optimized. The working fluid used in this investigation is R-22. ASHRAE`s condition A [Outside 95 F DBT/75 F WBT; Inside 80 F/67 F WBT] is used in this investigation. The predicted performance of the condenser is within {+-}5% of the experimental data.

Mathur, G.D. [Zexel USA Corp., Decatur, IL (United States). HVAC Systems

1996-12-31

485

Investigation of nerve injury through microfluidic devices  

PubMed Central

Traumatic injuries, both in the central nervous system (CNS) and peripheral nervous system (PNS), can potentially lead to irreversible damage resulting in permanent loss of function. Investigating the complex dynamics involved in these processes may elucidate the biological mechanisms of both nerve degeneration and regeneration, and may potentially lead to the development of new therapies for recovery. A scientific overview on the biological foundations of nerve injury is presented. Differences between nerve regeneration in the central and PNS are discussed. Advances in microtechnology over the past several years have led to the development of invaluable tools that now facilitate investigation of neurobiology at the cellular scale. Microfluidic devices are explored as a means to study nerve injury at the necessary simplification of the cellular level, including those devices aimed at both chemical and physical injury, as well as those that recreate the post-injury environment. PMID:24227311

Siddique, Rezina; Thakor, Nitish

2014-01-01

486

Single Nanopore Investigations with Ion Conductance Microscopy  

PubMed Central

A three-electrode scanning ion conductance microscope (SICM) was used to investigate the local current-voltage properties of a single nanopore. In this experimental configuration, the response measured is a function of changes in the resistances involved in the pathways of ion migration. Single nanopore membranes utilized in this study were prepared with an epoxy painting procedure to isolate a single nanopore from a track-etch multi-pore membrane. Current-voltage responses measured with the SICM probe in the vicinity of a single nanopore were investigated in detail and agreed well with equivalent circuit models proposed in this study. With this modified SICM, the current-voltage responses characterized for the case of a single cylindrical pore and a single conical pore exhibit distinct conductance properties that originate from the geometry of nanopores. PMID:21923184

Chen, Chiao-Chen; Zhou, Yi; Baker, Lane A.

2011-01-01

487

Investigation on installation of offshore wind turbines  

NASA Astrophysics Data System (ADS)

Wind power has made rapid progress and should gain significance as an energy resource, given growing interest in renewable energy and clean energy. Offshore wind energy resources have attracted significant attention, as, compared with land-based wind energy resources, offshore wind energy resources are more promising candidates for development. Sea winds are generally stronger and more reliable and with improvements in technology, the sea has become a hot spot for new designs and installation methods for wind turbines. In the present paper, based on experience building offshore wind farms, recommended foundation styles have been examined. Furthermore, wave effects have been investigated. The split installation and overall installation have been illustrated. Methods appropriate when installing a small number of turbines as well as those useful when installing large numbers of turbines were analyzed. This investigation of installation methods for wind turbines should provide practical technical guidance for their installation.

Wang, Wei; Bai, Yong

2010-06-01

488

Collaring the cybercrook: an investigator's view  

Microsoft Academic Search

In 1996 the U.S. Federal Computer Incident Response Capability (FedCIRC) reported more than 2500 incidents, defined as adverse events in a computer system or networks caused by a failure of a security mechanism, or an attempted or threatened breach of these mechanisms. The Federal Bureau of Investigation's National Computer Crimes Squad, Washington, D.C., estimates that less than 15 percent of

D. J. Icove

1997-01-01

489

Online Auctions: Theoretical and Empirical Investigations  

E-print Network

OF PHILOSOPHY Approved by: Co-Chairs of Committee, Brit Grosskopf Rajiv Sarin Committee Members, Qi Li Guoqiang Tian Jianhua Huang Head of Department, Timothy Gronberg August 2010 Major Subject: Economics iii ABSTRACT Online Auctions: Theoretical and Empirical... Investigations. (August 2010) Yu Zhang, B.S., Peking University; Ph.D., Duke University Co?Chairs of Advisory Committee: Dr. Brit Grosskopf Dr. Rajiv Sarin This dissertation, which consists of three essays, studies online auctions both theoretically...

Zhang, Yu

2010-10-12

490

Geotechnical investigation methods for rock salt  

Microsoft Academic Search

Summary  The need for storage caverns (oil, gas.) and depositories (radioactive waste, toxic waste) is rising world-wide. Rock salt\\u000a (halite) formations are exceptionally suitable for the construction of such cavities. However, accurate dimensioning can only\\u000a be carried out if the mechanical behaviour of rock salt is known with sufficient accurary.\\u000a \\u000a A survey of some theoretical and experimental investigations of the mechanical

M. Langer

1982-01-01

491

Animal-fat investigation and combustion test  

Microsoft Academic Search

The department was commissioned to investigate the possibilities for animal-fat combustion in industrial steam generators\\u000a operating originally on fuel–oil or natural gas. There are two main reasons for operating generators on animal fat as a fuel:\\u000a On one hand, this material is considered as hazardous waste, thus an important goal is its environmentally benign elimination\\u000a or disposal. On the other

Ferenc Lezsovits; Sándor Könczöl

492

Experimental investigation of a flapping wing model  

Microsoft Academic Search

The main objective of this research study was to investigate the aerodynamic forces of an avian flapping wing model system.\\u000a The model size and the flow conditions were chosen to approximate the flight of a goose. Direct force measurements, using\\u000a a three-component balance, and PIV flow field measurements parallel and perpendicular to the oncoming flow, were performed\\u000a in a wind

Tatjana Y. Hubel; Cameron Tropea

2009-01-01

493

The Utility of Coleoptera in Forensic Investigations  

Microsoft Academic Search

\\u000a Forensic entomology is a developing field of forensic science, so there are many avenues to investigate. These avenues include\\u000a novel directions that have never been addressed, as well as more critical and rigorous research into areas which have already\\u000a been explored. Most research in forensic entomology has focused on flies, and beetles (Coleoptera) have been at best under-emphasized.\\u000a A good

John M. Midgley; Cameron S. Richards; Martin H. Villet

494

Spectroscopic investigation of unstudied southern PNe  

E-print Network

We present a spectroscopic investigation of two hitherto unstudied galactic planetary nebulae (MeWe 1-10 and MeWe 1-11) and one candidate object (MeWe 2-5). The candidate object clearly has been identified as a bipolar hourglass shaped PN. The galactic foreground extinction was derived and using photoionization models with CLOUDY the two round objects were classified as highly evolved nebulae.

Emprechtinger, M

2004-01-01

495

Spectroscopic investigation of unstudied southern PNe  

E-print Network

We present a spectroscopic investigation of two hitherto unstudied galactic planetary nebulae (MeWe 1-10 and MeWe 1-11) and one candidate object (MeWe 2-5). The candidate object clearly has been identified as a bipolar hourglass shaped PN. The galactic foreground extinction was derived and using photoionization models with CLOUDY the two round objects were classified as highly evolved nebulae.

M. Emprechtinger; T. Forveille; S. Kimeswenger

2004-05-28

496

Spectroscopic investigation of unstudied southern PNe  

NASA Astrophysics Data System (ADS)

We present a spectroscopic investigation of two hitherto unstudied galactic planetary nebulae (MeWe 1-10 and MeWe 1-11) and one candidate object (MeWe 2-5). The candidate object clearly has been identified as a bipolar hourglass-shaped PN. The galactic foreground extinction was derived and using photoionization models with CLOUDY the two round objects were classified as highly evolved nebulae. Based on observations collected at the European Southern Observatory, La Silla.

Emprechtinger, M.; Forveille, T.; Kimeswenger, S.

2004-09-01

497

FT Raman investigation of sodium cellulose sulfate  

Microsoft Academic Search

FT Raman investigation of sodium cellulose sulfates (NaCS) was reported. Different NaCS were prepared by two diverse sulfation\\u000a methods and their total degrees of substitution (DS) of sulfate groups were determined through either 13C-NMR spectroscopy or elemental analysis. Subsequently, these NaCS were characterized with FT Raman spectroscopy. The caused\\u000a bands through the introduction of the sulfate groups in cellulose chain

Kai Zhang; Erica Brendler; Steffen Fischer

2010-01-01

498

Single-Molecule Investigations of RNA Dissociation  

Microsoft Academic Search

Given the essential cellular roles for ribonucleic acids (RNAs) it is important to understand the stability of three-dimensional structures formed by these molecules. This study aims to investigate the dissociation energy landscape for simple RNA structures via atomic-force-microscopy-based single-molecule force-spectroscopy measurements. This approach provides details on the locations and relative heights of the energy barriers to dissociation, and thus information

Nicola H. Green; Philip M. Williams; Omar Wahab; Martyn C. Davies; Clive J. Roberts; Saul J. B. Tendler; Stephanie Allen

2004-01-01

499

Raman Spectroscopic Investigation of Dyes in Spices  

NASA Astrophysics Data System (ADS)

In this study, a number of synthetic colorants for spices have been investigated by means of Raman spectroscopy, resonance Raman spectroscopy, and surface enhanced (resonance) Raman spectroscopy (SER(S)). The aim of the study was the determination of limits of detection for each dye separately and in binary mixtures of dyes in spiked samples of the spices. Most of the investigated dyes have been azo dyes, some being water-soluble, the other being fat-soluble. Investigating the composition of food preparations is an ongoing and important branch of analytical sciences. On one hand, new ingredients have to be analyzed with regard to their contents, on the other hand, raw materials that have been tampered have to be eliminated from food production processes. In the last decades, the various Raman spectroscopic methods have proven to be successful in many areas of life and materials sciences. The ability of Raman spectroscopy to distinguish even structural very similar analytes by means of their vibrational fingerprint will also be important in this study. Nevertheless, Raman scattering is a very weak process that is oftentimes overlaid by matrix interferences or fluorescence. In order to achieve limits of detection in the nanomolar range, the signal intensity has to be increased. According to the well-known equations, there are several ways of achieving this increase: •increasing sample concentration •increasing laser power •decreasing the laser wavelength •using electronic resonance •increasing the local electromagnetic field In this study, nearly all of the above-mentioned principles were applied. In a first step, all dyes were investigated in solution at different concentrations to determine a limit of detection. In the second step, spiked spice samples have been extracted with a variety of solvents and process parameters tested. To lower the limit of detection even further, SERS spectroscopy has been used as well in as out of electronic resonance.

Uhlemann, Ute; Ramoji, Anuradha; Rösch, Petra; Da Costa Filho, Paulo Augusto; Robert, Fabien; Popp, Jürgen

2010-08-01

500

The magnetic field investigation on Cluster  

NASA Technical Reports Server (NTRS)

The magnetic field investigation of the Cluster four-spacecraft mission is designed to provide intercalibrated measurements of the B magnetic field vector. The instrumentation and data processing of the mission are discussed. The instrumentation is identical on the four spacecraft. It consists of two triaxial fluxgate sensors and of a failure tolerant data processing unit. The combined analysis of the four spacecraft data will yield such parameters as the current density vector, wave vectors, and the geometry and structure of discontinuities.

Balogh, A.; Cowley, S. W. H.; Southwood, D. J.; Musmann, G.; Luhr, H.; Neubauer, F. M.; Glassmeier, K.-H.; Riedler, W.; Heyn, M. F.; Acuna, M. H.

1988-01-01