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1

Smart protection in Dutch Medium Voltage distributed generation systems  

Microsoft Academic Search

The paper investigates the impact of distributed generators integration in Dutch Medium Voltage grids. Typical protection problems are described and analyzed. The current applied time-graded overcurrent protection scheme is evaluated and its shortcomings are highlighted. A new software algorithm for coordinating relays in any arbitrary network is proposed. The real hardware implementation of the protection scheme that makes use of

Ioanna Xyngi; Marjan Popov

2010-01-01

2

Grounding medium-voltage mobile or portable equipment  

Microsoft Academic Search

Examples of medium-voltage mobile equipment in pulp and paper mills include rail-mounted portal cranes for log handling, chip and bark stackers, and chip-reclaim screws. No examples of portable medium-voltage equipment can be cited. National Electrical Code (NEC) section 250-188 describes the requirements for system and equipment grounding of portable or mobile equipment rated 1 kV and higher. One of the

W. F. Robertson; J. C. Das

2000-01-01

3

Evaluation of medium voltage enameled wire exposed to fast repetitive voltage pulses  

Microsoft Academic Search

The paper describes the investigation of the failure mechanisms of medium voltage inter-turn insulation, as a consequence of pulse aging. To study the performance and failure behaviour of enameled wires, models of inter-turn insulation are prepared with enameled wires having polyimide and nano-filled coatings. The aging of such bar samples is attained by sinusoidal (60Hz), fast repetitive unipolar voltage pulses,

Saeed Ul Haq; Shesha H. Jayaram; Edward A. Cherney

2007-01-01

4

Voltage stress on induction motors in medium voltage (2300 to 6900 V) PWM GTO CSI drives  

Microsoft Academic Search

This paper deals with voltage stress on induction motors in medium voltage PWM GTO current source inverter drives. The voltage stress on the motor in this transformerless drive is investigated. Analytical equations are derived for the calculation of the maximum peak line-to-ground voltage applied to the motor. It is demonstrated in the paper that this peak line-to-ground voltage could be

Bin Wu; F. DeWinter

1995-01-01

5

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

Code of Federal Regulations, 2013 CFR

... 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...

2013-07-01

6

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

7

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

8

A Dual-Functional Medium Voltage Level DVR to Limit Downstream Fault Currents  

Microsoft Academic Search

The dynamic voltage restorer (DVR) is a modern custom power device used in power distribution networks to protect consumers from sudden sags (and swells) in grid voltage. Implemented at medium voltage level, the DVR can be used to protect a group of medium voltage or low voltage consumers. However, the DVR will therefore be tasked to mitigate even more faults

Yun Wei Li; D. Mahinda Vilathgamuwa; Poh Chiang Loh; Frede Blaabjerg

2007-01-01

9

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

Code of Federal Regulations, 2010 CFR

...2010-07-01 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...

2010-07-01

10

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

Code of Federal Regulations, 2010 CFR

...2009-07-01 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...

2009-07-01

11

Model of the arc earth-fault for medium voltage networks  

NASA Astrophysics Data System (ADS)

In this paper the universal model of dynamic short-circuit arcs is presented for simulation of earth-fault in medium voltage networks. The model describes the entire arc short-circuit process: the ignition, the burning stage, the arc extinction and the increasing recovery voltage. Four alternative choices of the characteristics of the static arc are implemented and compared. Simulation results in medium voltage networks are described. Realistic current and voltage time dependencies are obtained.

Marciniak, Lubomir

2011-06-01

12

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

13

Severe degradation of the conductor screen of service and laboratory aged medium voltage XLPE insulated cables  

Microsoft Academic Search

The main purpose of this paper is to show the strong correlation between corrosion of the metallic aluminum conductor and the formation of interconnected cracks \\/ voids in the conductor screen, creating initiation sites for vented water trees in service aged medium voltage XLPE cables. The results show that porous structures in the conductor screen previously reported for laboratory aged

Sverre Hvidsten; Stine Kvande; Arve Ryen; Per Bjørn Larsen

2009-01-01

14

Multi-end correlation-based PD location technique for medium voltage covered-conductor lines  

Microsoft Academic Search

In Finland, overhead covered conductors (CC) are commonly used in the medium voltage (MV) networks because the distribution loads in rural areas are not heavy and are widely distributed in the forested terrain. Such parts of the network are exposed to leaning trees and therefore partial discharging into the overhead CC frequently occurs. In this paper, a multi-end correlation-based technique

Muzamir Isa; Nagy I. Elkalashy; Matti Lehtonen; Ghulam M. Hashmi; Mohammed Elmusrati

2012-01-01

15

Comparative Performance of Medium Voltage Overhead Distribution Lines Designs Submitted to Induced Voltages  

Microsoft Academic Search

The aim of this paper is to present the results of the performance study of medium voltage overhead distribution lines against lightning discharges, in the way to define methodologies to reduce the system failures. The results are obtained within the partnership among the High Voltage Laboratory of the Federal University of Itajuba, AES Sul Utility Company and the University of

Marco Saran; Manuel Martinez; Rafael Bonon; Hermes Oliveira; Carlo Nucci; Mario Paolone

2007-01-01

16

Research on a Novel Dynamic Voltage Quality Regulator in Medium Voltage  

Microsoft Academic Search

In accordance with the familiar power quality problem, such as voltage sag, flicker, harmonic suppression and short circuit fault, this paper designed a novel series voltage quality regulator in medium voltage for the multiple objective control basing on the cascaded multilevel H-bridge method, and analysis its working principle in detail. A Short-circuit current limiter is designed in this paper, the

Yajing Di; Zhongdong Yin; Xiangning Xiao; Renzhong Shan

2009-01-01

17

Development of Medium-Voltage Networks: General Layout of Electricity Supply Systems Serving Urban Areas.  

National Technical Information Service (NTIS)

The strategy for developing urban medium-voltage networks can only be based on trends of a general nature, because of the diversity of situations and layouts already in existence. The author defines these trends with regard to bulk-supply substations, the...

D. Thibon

1982-01-01

18

Medium voltage gas insulated switchgear-highest reliability and availability under severe climatic conditions in urban networks  

Microsoft Academic Search

Alstom's medium voltage gas-insulated switchgear technology is based on nearly two decades' experience. In addition, the medium voltage concept has been derived from the high voltage gas-insulated switchgear design, on which Alstom has even a much longer experience (since the end of the sixties) and world-wide references, making Alstom the world market leader

A. Buscher; K. Klemmer

2000-01-01

19

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

20

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

21

Development of Medium-Voltage and Large-Capacity Uninterruptible Power Supply System  

NASA Astrophysics Data System (ADS)

A 2-MVA uninterruptible power supply (UPS) system has been developed for compensating for voltage dips in a medium voltage network. The UPS system realizes a high efficiency (99.7%) during single-pulse switching. In this paper, the UPS configurations, storage devices, and transfer switches are compared. Thereafter, the details of the UPS system, the results of the short-circuit test and the system efficiencies are described.

Fujii, Kansuke; Kikuchi, Takayuki; Yoda, Kazuyuki

22

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

23

A Transformerless Medium-Voltage STATCOM Topology Based on Extended Modular Multilevel Converters  

Microsoft Academic Search

A new transformerless four-leg topology is suggested for shunt compensation, the modular multilevel converters (MMC) based on the half-bridge converters, to achieve higher perfor- mance as a STATCOM in a distorted and unbalanced medium- voltage large-current (MV-LC) system. Further, an extended MMC (EMMC) is proposed in order to manage more accurate compen- sation for high-power applications. Both proposals can be

M. Tavakoli Bina

2011-01-01

24

Extended modular multilevel converters suitable for medium-voltage and large-current STATCOM applications  

Microsoft Academic Search

This paper discusses a new transformerless shunt static compensator (STATCOM) based on the extended modular multilevel converter (EMMC), to achieve higher performance in a medium-voltage large-current network. It introduces an appropriate control algorithm based on a phase-shifted carrier modulation strategy, to ensure the source-end three-phase currents are sinusoidal and balanced, balancing the voltages of the dc-link capacitors of the modules

H. Mohammadi Pirouz; M. Tavakoli Bina

2010-01-01

25

Advanced commercial power system protection practices applied to naval medium voltage power systems  

Microsoft Academic Search

In the U.S. navy's transition to an all-electric ship, system designers must take great care to ensure that critical design choices provide highly reliable and safe power system operation and protection during all mission scenarios. Transitioning from low voltage (450 VAC) radial configurations to medium voltage (13.8 kVAC) multi-source systems requires new naval protection schemes. This paper specifically analyzes methods

David Whitehead; Nomann Fischer

2005-01-01

26

Grid-Filter Design for a Multimegawatt Medium-Voltage Voltage-Source Inverter  

Microsoft Academic Search

This paper describes the design procedure and per- formance of an LCL grid filter for a medium-voltage neutral- point clamped converter to be adopted for a multimegawatt (multi-MW) wind turbine. The unique filter design challenges in this application are driven by a combination of the medi- um-voltage converter, a limited allowable switching frequency, component physical size and weight concerns, and

A. A. Rockhill; Marco Liserre; Remus Teodorescu; Pedro Rodriguez

2011-01-01

27

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

28

Transformerless Hybrid Topology for Medium-Voltage Reactive-Power Compensation  

Microsoft Academic Search

In this paper, natural sinusoidal hybrid converter is presented for medium-voltage reactive-power control applications. Main high-voltage inverter that produces fundamental reactive current is a square-wave inverter. Several single-phase full-bridge converters are connected in series with this square inverter to elim- inate harmonic voltages from the net output voltage of this hybrid converter. DC bus voltages of these cells are naturally

Malaya Kumar Sahu; Gautam Poddar

2011-01-01

29

Wavelet based method for fault detection in Medium Voltage DC shipboard power systems  

Microsoft Academic Search

This paper proposes a wavelet transform (WT) based multi-resolution analysis (MRA) method to obtain the features of different fault types in Medium Voltage DC (MVDC) shipboard power systems. DC topology is under consideration for future all-electric ships. One of the new challenges related to this architecture is fault detection. WT-based MRA method, as well as its properties, are studied and

Weilin Li; Min Luo; Antonello Monti; Ferdinanda Ponci

2012-01-01

30

Modelling, simulation and analysis of a Modular Multilevel Converter for medium voltage applications  

Microsoft Academic Search

The Modular Multilevel Converter (M2C) is an emerging multilevel converter for HVDC and FACTS as well as for future AC-fed traction vehicles or medium voltage drives (MVD). A suitable converter model of the Modular Multilevel Converter (M2C) is presented. A 7.2 kV, 7.5 MVA converter is taken as an example to analyze characteristic waveforms of the converter. The cause of

Steffen Rohner; Steffen Bernet; Marc Hiller; Rainer Sommer

2010-01-01

31

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

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

A PWM CSI-based vector controlled medium voltage AC drive with sinusoidal input and output waveforms  

Microsoft Academic Search

A vector controlled medium voltage AC motor drive is proposed in this paper which is based on a current source topology consisting of a PWM GTO current source inverter (CSI) as the output connected to the motor and a two-module PWM GTO current source rectifier (CSR) as the front end. The output inverter is operated with selective harmonic elimination (SHE)

Navid Zargari; Yuan Xiao; Bin Wu

1997-01-01

34

Modeling, simulation and experimental validation of a generation system for Medium-Voltage DC Integrated Power Systems  

Microsoft Academic Search

In this paper, a demonstrative technological implementation of a shipboard 2.15 MVA generation system is described along with its modeling, numeric simulation and some factory tests. The system, named Naval Package (NP), is part of a demonstrative programme commissioned by Italian Navy for preliminary evaluations of Medium-Voltage DC (MVDC) supply technologies aimed at equipping her future vessels. The NP is

G. Sulligoi; A. Tessarolo; V. Benucci; M. Baret; A. Rebora; A. Taffone

2009-01-01

35

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

36

New medium voltage drive systems using three-level neutral point clamped inverter with high voltage IGBT  

Microsoft Academic Search

This paper presents a new range of medium voltage motor drives with a three-level neutral point clamped inverter using high-voltage IGBTs. Different line side converters are available, including a twelve pulse diode rectifier and an active front end converter in the same configuration as the inverter. Innovative features of the drive include series-connection of high-voltage IGBTs and a novel isolated

R. Sommer; A. Mertens; M. Griggs; H.-J. Conraths; M. Bruckmann; T. Greif

1999-01-01

37

A medium frequency transformer with multiple secondary windings for medium voltage converter based wind turbine power generating systems  

NASA Astrophysics Data System (ADS)

Recent advances in magnetic materials have led to the development of compact and light weight, medium and high frequency transformers, which would be a possible solution to reducing the size and weight of wind turbine power generating systems. This paper presents the overall design and analysis of a Metglas amorphous alloy 2605SA1 based medium frequency transformer to generate the isolated balanced multiple DC supplies for medium voltage converter systems. A comprehensive electromagnetic analysis is conducted on the proposed design based on experimental results. The test stand, data analysis, and test results are discussed.

Islam, Md Rabiul; Guo, Youguang; Zhu, Jianguo

2013-05-01

38

Retrofit of fixed speed induction motors with medium voltage drive converters using NPC three-level inverter high-voltage IGBT based topology  

Microsoft Academic Search

This paper presents a solution to allow simple and risk-free retrofit of existing fixed speed induction motors with medium voltage adjustable speed drives to achieve attractive energy savings. The presented medium voltage adjustable speed drive consists of a twelve-pulse diode rectifier and a three-level neutral point clamped inverter using high-voltage IGBTs. Innovative features of the drive include series-connection of high-voltage

Benoit P. Schmitt; Rainer Sommer

2001-01-01

39

Evaluation of the operational condition and reliability of surge arresters used on medium voltage networks  

Microsoft Academic Search

Laboratory studies were conducted on gapped silicon-carbide arresters and gapless metal-oxide surge arresters (MOAs) gathered from 24 kV networks in Finland. A total of 410 arresters of 21 different types from eight different manufacturers were investigated. A total of 246 silicon-carbide arresters (age from 14 to 38 years) and 164 MOAs (age from 4 to 15 years) were studied at

Kari Kannus; Kari Lahti

2005-01-01

40

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

41

Advanced medium-voltage bidirectional dc-dc conversion systems for future electric energy delivery and management systems  

NASA Astrophysics Data System (ADS)

The distributed renewable energy generation and utilization are constantly growing, and are expected to be integrated with the conventional grid. The growing pressure for innovative solutions will demand power electronics to take an even larger role in future electric energy delivery and management systems, since power electronics are required for the conversion and control of electric energy by most dispersed generation systems Furthermore, power electronics systems can provide additional intelligent energy management, grid stability and power quality capabilities. Medium-voltage isolated dc-dc converter will become one of the key interfaces for grid components with moderate power ratings. To address the demand of medium voltage (MV) and high power capability for future electric energy delivery and management systems, the power electronics community and industry have been reacting in two different ways: developing semiconductor technology or directly connecting devices in series/parallel to reach higher nominal voltages and currents while maintaining conventional converter topologies; and by developing new converter topologies with traditional semiconductor technology, known as multilevel converters or modular converters. The modular approach uses the well-known, mature, and cheaper power semiconductor devices by adopting new converter topologies. The main advantages of the modular approach include: significant improvement in reliability by introducing desired level of redundancy; standardization of components leading to reduction in manufacturing cost and time; power systems can be easily reconfigured to support varying input-output specifications; and possibly higher efficiency and power density of the overall system. Input-series output-parallel (ISOP) modular configuration is a good choice to realize MV to low voltage (LV) conversion for utility application. However, challenges still remain. First of all, for the high-frequency MV utility application, the low switching loss and conduction loss are must-haves for high efficiency, while bidirectional power flow capability is a must for power management requirement. To address the demand, the phase-shift dual-halfbridge (DHB) is proposed as the constituent module of ISOP configuration for MV application. The proposed ISOP DHB converter employs zero-voltage-switching (ZVS) technique combined with LV MOSFETs to achieve low switching and conduction losses under high frequency operation, and therefore high efficiency and high power density, and bidirectional power flow as well. Secondly, a large load range of high efficiency is desired rather than only a specific load point due to the continuous operation and large load variation range of utility application, which is of high importance because of the rising energy cost. This work proposes a novel DHB converter with an adaptive commutation inductor. By utilizing an adaptive inductor as the main energy transfer element, the output power can be controlled by not only the phase shift but also the commutation inductance, which allows the circulating energy to be optimized for different load conditions to maintain ZVS under light load conditions and minimize additional conduction losses under heavy load conditions as well. As a result, the efficiency at both light and heavy load can be significantly improved compared with the conventional DHB converter, and therefore extended high-efficiency range can be achieved. In addition, current stress of switch devices can be reduced. The theoretical analysis is presented and validated by the experimental results on a 50 kHz, 1 kW dc-dc converter module. Thirdly, input-voltage sharing and output-current sharing are critical to assure the advantages of the ISOP modular configuration. To solve this issue, an identically distributed control scheme is proposed in this work. The proposed control scheme, using only one distributed voltage loop to realize both input-voltage and output-current sharing, provides plug-and-play capability, possible high-level fault tolerance, and easy implementatio

Fan, Haifeng

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

Estimation of Sparkover Rate of Medium-Voltage Line Due to Indirect Lightning Hit Taking Account of Correlation between Peak Value and Front Duration of Return-Stroke Current Waveform  

NASA Astrophysics Data System (ADS)

The lightning-induced voltage has been one of the factors for the insulation design of a power distribution line. The authors have developed a method of analysis of induced voltages where the Agrawal's model is adopted as a field-to-line coupling model. In this paper, the sparkover rate of a medium-voltage line associated with indirect hits is investigated based on numerical calculations and statistical analysis by taking account of the correlation between the peak value and the front duration of the return-stroke current waveform. Regardless of the intensity of the correlation between these parameters, the sparkover rate associated with a subsequent stroke is higher than that associated with a first stroke when the line is equipped with surge arresters. Furthermore, it is shown that the sparkover rate significantly decreases with the increase of the correlation coefficient. This demonstrates the importance of the study of the correlation between the return-stroke current parameters.

Hongo, Yasuji; Michishita, Koji

44

A new 7.2kV medium voltage 3-Level-NPC inverter using 6.5kV-IGBTs  

Microsoft Academic Search

The SINAMICS GM150 IGBT, a new 3-level-neutral-point-clamped (3L-NPC) Voltage-Source- Converter (VSC) with series-connected 6.5 kV-IGBTs for industrial Medium Voltage Drives is presented. It covers the output voltage range from 6 kV up to 7.2 kV without the need for a step-up output transformer. The SINAMICS GM150 IGBT is based on the proven basic design of its predecessor SIMOVERT MV while

Christian Dietrich; Swen Gediga; Marc Hiller; Rainer Sommer; Hans Tischmacher

2007-01-01

45

Measurements and Modeling of Noise on 22.9-kV Medium-Voltage Underground Power Line for Broadband Power Line Communication  

NASA Astrophysics Data System (ADS)

This paper proposed the measurements and modeling of noise on the 22.9-kV Medium-Voltage (MV) underground power distribution cable for Broadband Power Line Communication (BPLC). The proposed measurement system was composed of inductive coupler and Digital Phosphor Oscilloscope (DPO). The measurement noise data was obtained from thirty-two pad mounted transformers in the test field located in Choji area of Ansan city. After conducting analysis of noise characteristics in time and frequency domain, the noise model are presented. In order to analyze the noise in frequency domain, Power Spectral Density (PSD) was computed with empirical data using Welch's method. The modeling of the power line noise at each frequency carried out using Cumulative Probability Distribution (CPD) of the noise power. It compared with common Cumulative Distribution Functions (CDF) of Nakagami-m distribution, Gaussian distribution, Gamma distribution. In low frequency range, gamma distribution was fitted with the CPD. Nakagami-m distribution provides a good fitting to the noise CPD above 20MHz frequency range.

Lee, Seungjoon; Shin, Donghwan; Kim, Yonghwa; Lee, Jaejo; Eom, Kihwan

46

Estimation of Sparkover Rate of Medium-Voltage Line Due to Indirect Lightning Hit Taking account of Statistics on Return-stroke Current  

NASA Astrophysics Data System (ADS)

The authors have developed a method of analysis of induced voltages where the Agrawal's model is adopted as a field-to-line coupling model. In this letter, the sparkover rate of a power distribution line associated with indirect hits is investigated based on numerical calculations taking account of statistics on return-stroke current. It turns out that the sparkover rate associated with a subsequent stroke is higher than that associated with a first stroke when the line is equipped with surge arresters.

Hongo, Yasuji; Michishita, Koji; Ishii, Masaru

47

Investigation of an Atypical Sixth Harmonic Current Level of a 5 MW Wind Turbine Configuration  

Microsoft Academic Search

Current harmonic production of a 5 MW offshore wind turbine prototype is investigated on an onshore test site. On the PCC an atypical high level of the sixth harmonic current was measured. The evaluation of the existing configuration for future extensions with other wind turbines requires the investigation of this effect. Therefore the existing technical structure with medium voltage cable

Steffen Schostan; K.-D. Dettmann; D. Schulz; J. Plotkin

2007-01-01

48

Medium Voltage Switchgear: Trends in Design and Construction Technology.  

National Technical Information Service (NTIS)

Substations construction technologies are reviewed with particular emphasis given to the improved design of switching apparatus and their safety charcateristics. Non-conventional use of SF(sub 6) is discussed with regard to requirements set by internation...

G. Catenacci

1986-01-01

49

Architecture for a High-to-Medium-Voltage Power Converter  

NASA Technical Reports Server (NTRS)

A power converter now undergoing development is required to operate at a DC input potential ranging between 5.5 and 10 kV and a DC output potential of 400 V at a current up to 25 A. This power converter is also required to be sufficiently compact and reliable to fit and operate within the confines of a high-pressure case to be lowered to several miles (approx.5 km) below the surface of the ocean. The architecture chosen to satisfy these requirements calls for a series/ parallel arrangement of 48 high-frequency, pulse-width-modulation (PWM), transformer-isolation DC-to-DC power converter blocks. The input sides of the converter blocks would be connected in series so that the input potential would be divided among them, each of them being exposed to an input potential of no more than 10 kV/48 . 210 V. The series connection of inputs would also enforce a requirement that all the converter blocks operate at the same input current. The outputs of the converter blocks would be connected in a matrix comprising 6 parallel legs, each leg being a cascade of eight outputs wired in series (see figure). All the converter blocks would be identical within the tolerances of the values of their components. A single voltage feedback loop would regulate the output potential. All the converter blocks would be driven by the same PWM waveform generated by this feedback loop. The power transformer of each converter block would have a unity turns ratio and would be capable of withstanding as much as 10 kVDC between its primary and secondary windings. (Although, in general, the turns ratio could be different from unity, the simplest construction for minimizing leakage and maximizing breakdown voltage is attained at a turns ratio of unity.)

Vorpenian, Vatche

2008-01-01

50

New configuration of UPQC for medium-voltage application  

Microsoft Academic Search

This paper proposes a novel configuration of a unified power quality conditioner (UPQC) which can be connected to the distribution system without series injection transformers. The operation of the proposed system was analyzed through simulations with PSCAD\\/EMTDC and experimental works with a scaled hardware model, assuming that the UPQC is connected with the 22.9-kV distribution line. The proposed UPQC has

B. Han; B. Bae; S. Baek; G. Jang

2006-01-01

51

An Approach to the Lightning Overvoltage Protection of Medium Voltage Lines in Severe Lightning Areas  

SciTech Connect

This paper deals with the effect of shield wires on lightning overvoltage reduction and the energy relief of MOV (Metal Oxide Varistor) arresters from direct strokes to distribution lines. The subject of discussion is the enhancement of lightning protection in Finnish distribution networks where lightning is most severe. The true index of lightning severity in these areas is based on the ground flash densities and return stroke data collected from the Finnish meteorological institute. The presented test case is the IEEE 34-node test feeder injected with multiple lightning strokes and simulated with the Alternative Transients Program/Electromagnetic Transients program (ATP/EMTP). The response of the distribution line to lightning strokes was modeled with three different cases: no protection, protection with surge arresters and protection with a combination of shield wire and arresters. Simulations were made to compare the resulting overvoltages on the line for all the analyzed cases.

Omidiora, M. A.; Lehtonen, M. [Power Systems and High Voltage Engineering Laboratory, Electrical Engineering Department, Helsinki University of Technology, Otaniemi, Espoo (Finland)

2008-05-08

52

Panel session on PEBB concepts - from medium voltage drives to high voltage applications  

Microsoft Academic Search

Deregulation and privatization are posing new challenges to high voltage transmission and distributions systems. System components are loaded up to their thermal limits, and power trading with fast varying load patterns is leading to an increasing congestion. In addition to this, the dramatic global climate developments call for changes in the way electricity is supplied. Innovative solutions with HVDC (High

D. Retzmann; H. Gambach

2010-01-01

53

Design and Simulation of 2Parameters TRV Synthetic Testing Circuit for Medium Voltage Circuit Breakers  

Microsoft Academic Search

Short circuit tests on circuit breakers are performed to prove the ratings of the circuit breakers. The drawbacks of direct testing using the power system or short circuit alternators: direct testing requires high power for testing CBs, high cost of installation, flexibility of the system available is limited and availability of limited power for testing of high voltage circuit breakers.

J. G. Jamnani; S. A. Kanitkar

2006-01-01

54

Design and comparison of medium voltage multi-level converters for industry applications  

Microsoft Academic Search

This paper describes the design of a (2.3 kV, 2.4 MVA) two-level -, three-level - neutral point clamped -, three-level - flying capacitor - and four-level - flying capacitor - voltage source converter on the basis of state-of-the-art 6.5 kV, 3.3 kV and 2.5 kV IGBTs. The semiconductor loss distribution, design, and costs of semiconductors and passive components are compared

Dietmar Krug; Mariusz Malinowski; Steffen Bernet

2004-01-01

55

Performance of nanofillers in medium voltage magnet wire insulation under high frequency applications  

Microsoft Academic Search

The paper presents the experimental results on accelerated aging of enameled wires with and without nanofiller in the coating under partial discharge (PD) activity. The residual life of the wires, and the surface roughness as measured by a scanning electron microscope (SEM), are used to evaluate the effects of the nanofiller. The surface erosion in the specimens without nanofiller is

Saeed Ul Haq; Shesha H. Jayaram; Edward A. Cherney

2007-01-01

56

Potentially damaging failure modes of high- and medium-voltage electrical equipment  

Microsoft Academic Search

The electrical equipment failures of both nuclear and nonnuclear public utilities were reviewed. Those failures that could pose an additional problem to surrounding and connected equipment were defined. The literature was searched; utilities, repair shops, and large electrical equipment users were contacted for failure information. The data were reviewed in detail, and failure modes were determined. Sample cascade failures are

Hoy

1983-01-01

57

Dead-time compensation of 3-level NPC inverter for medium voltage IGCT drive system  

Microsoft Academic Search

In most cases, it is essential to insert a delay time in the switching signals to avoid the damage of the power electronic devices and prevent the shoot-through of the DC-link. This causes the dead-time effect and it can be minimized to improve the performance of inverters. In this paper, a novel method, which can eliminate the deviation of the

Haishan Li; Yaohua Li; Qiongxuan Ge

2004-01-01

58

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

59

Modeling of medium voltage power electronics converters utilizing advanced simulation tools  

Microsoft Academic Search

This paper addresses the steady-state and dynamic modeling of a three-level, neutral-point-clamped (NPC) voltage source converter (VSC) with active front-end (AFE) in a commercial 2.5 MW variable speed motor drive (VSD). The AFE of the modeled VSD adopts the selective harmonic elimination SHE-PWM technique with the optimization of inverter power capacity and power source quality for a wide- range VSD

Oleg Vodyakho; Tim Chiocchio; Michael Steurer; Chris Edrington; Mike Sloderbeck

2011-01-01

60

A 24 MVA inverter using IGCT series connection for medium voltage applications  

Microsoft Academic Search

This paper describes a 24 MVA inverter utilizing the series connection of three IGCTs per switch position in a three-level neutral point clamped inverter topology. The electrical design, especially focused on one phase leg, as well as experimental results, are shown

A. Nagel; S. Bernet; P. K. Steimer; O. Apeldoorn

2001-01-01

61

Passive shunt harmonic filters for low and medium voltage: A cost comparison study  

SciTech Connect

This paper presents the cost of 480V and 13.8kV passive shunt harmonic filters tuned at 300, 420, 660 and 780 Hz. The cost is presented in function of the kVA of the load served by the filters, the 60Hz reactive power produced by the filter and the total non-60Hz apparent power of the load. The main conclusion of this work is that for nonlinear loads in excess of 1 MVA it is more economical to use filter centers connected on the 13.8kV side.

Kawann, C. [Graz Univ. of Technology (Austria)] [Graz Univ. of Technology (Austria); Emanuel, A.E. [Worcester Polytechnic Inst., MA (United States)] [Worcester Polytechnic Inst., MA (United States)

1996-11-01

62

Stability analysis of a medium voltage local energy system with decentralized generation  

Microsoft Academic Search

In this paper the impact of the decentralized generation provided by renewable sources, as e.g. wind parks, fuel cell power plants and photovoltaic plants, on the stability of a Local Energy System (LES) are studied. Small dimensions, small power, and the neighbourhood of generators and consumers characterize these systems. Decentralized generation in the power system is studied not only in

Peter Schegner; Piergiovanni La Seta; Sven Höpfner

2005-01-01

63

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

Code of Federal Regulations, 2013 CFR

...conductors and serves as a grounding conductor for the frames...from the circuit. (b) Grounding resistors, where required...more than 25 amperes. Such grounding resistors shall be rated...phase-to-phase voltage of the system. (c) Low- and...

2013-07-01

64

Advanced Medium-Voltage Bidirectional DC-DC Conversion Systems for Future Electric Energy Delivery and Management Systems  

Microsoft Academic Search

The distributed renewable energy generation and utilization are constantly growing, and are expected to be integrated with the conventional grid. The growing pressure for innovative solutions will demand power electronics to take an even larger role in future electric energy delivery and management systems, since power electronics are required for the conversion and control of electric energy by most dispersed

Haifeng Fan

2011-01-01

65

A sensitivity approach to the sizing of insulated power cables in low and medium voltage electrical power distribution systems  

Microsoft Academic Search

The sizing of insulated power cables for use in electrical power distribution systems is based on definite engineering criteria. Cable or conductor size for a given current loading (ampacity) is the cross-sectional area or size of the current carrying portion of the cable, namely the conductor expressed in AWG (American Wire Gauge) or KCM (Kilocircular mils). The most commonly used

A. K. Hiranandani

1989-01-01

66

Robust Model-Following Control for the Current Loop of a Medium Voltage Neutral Point Clamped Active Filter  

Microsoft Academic Search

This work presents a robust model-following control technique applied to the current loop of a three phase shunt active filter based on an NPC inverter. A modelling procedure for implementing the proposed control is also shown. The transfer functions for the control of the currents injected by the active filter in the synchronous dq frame have been derived. The proposed

Alejandro Munduate; Ifiigo Garin; Gabriel Garcera; Emilio Figueres

2007-01-01

67

6 kV\\/1800 kVA medium voltage drive with three-level NPC inverter using IGCTs  

Microsoft Academic Search

This paper presents a 6 kV motor drive consisting of a 24-pulse rectifier and a three-level neutral-point-clamped (NPC) inverter using IGCTs. It is suitable for feeding standard industrial motors. Experimental results from the industrial installation show that the design and the implementation are successful.

Wenhua Liu; Qiang Song; Xiaorong Xie; Yuanhua Chen; Gangui Yan

2003-01-01

68

The testing methodologies of service aged medium voltage power cables as applied to an operating wind farm  

Microsoft Academic Search

As wind turbines quickly spread throughout the USA, many wind generation sites were designed, developed and installed very quickly and not always with long term dependability in mind. This review of cable testing methods used in both acceptance testing and annual maintenance practices will discuss the strengths and weaknesses of the various methodologies in wind farm applications. Also discussed will

Mike Moore

2011-01-01

69

Utility-Scale Silicon Carbide Semiconductor: Monolithic Silicon Carbide Anode Switched Thyristor for Medium Voltage Power Conversion  

SciTech Connect

ADEPT Project: GeneSiC is developing an advanced silicon-carbide (SiC)-based semiconductor called an anode-switched thyristor. This low-cost, compact SiC semiconductor conducts higher levels of electrical energy with better precision than traditional silicon semiconductors. This efficiency will enable a dramatic reduction in the size, weight, and volume of the power converters and electronic devices it's used in.GeneSiC is developing its SiC-based semiconductor for utility-scale power converters. Traditional silicon semiconductors can't process the high voltages that utility-scale power distribution requires, and they must be stacked in complicated circuits that require bulky insulation and cooling hardware. GeneSiC's semiconductors are well suited for high-power applications like large-scale renewable wind and solar energy installations.

None

2010-09-01

70

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

Code of Federal Regulations, 2013 CFR

...subpart E. (2) A grounding resistor rated...voltage of the system must be provided...mine. (9) The grounding system must include an...ground wire monitor system that satisfies the...larger external grounding conductor to...

2013-07-01

71

Watershed Investigations  

ERIC Educational Resources Information Center

Investigating local watersheds presents middle school students with authentic opportunities to engage in inquiry and address questions about their immediate environment. Investigation activities promote learning in an investigations interdisciplinary context as students explore relationships among chemical, biological, physical, geological, and…

Bodzin, Alec; Shive, Louise

2004-01-01

72

Investigator Resources  

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 Investigator Resources Investigator

73

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.

74

Accident investigation  

NASA Technical Reports Server (NTRS)

Aircraft accident investigations are discussed with emphasis on those accidents that involved weather as a contributing factor. The organization of the accident investigation board for air carrier accidents is described along with the hearings, and formal report preparation. Statistical summaries of the investigations of general aviation accidents are provided.

Brunstein, A. I.

1979-01-01

75

Clinical Investigations.  

National Technical Information Service (NTIS)

This report summarizes research conducted under protocols by staff members. Areas investigated include: Brucella sp, Cardiology, Chemical pain, Choline phosphotransferase, Dentistry, Electron microscopy, Endocrinology, Gallium, Gas chromatography, Gastroe...

1977-01-01

76

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.

77

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.

78

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

79

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.

80

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.

81

Quaternary investigation  

SciTech Connect

The primary purpose of the Quaternary investigation is to provide information on the location and age of Quaternary deposits for use in evaluating the presence or absence of neotectonic deformation or paleoliquefaction features within the Savannah River Site (SRS) region. The investigation will provide a basis for evaluating the potential for capable faults and associated deformation in the SRS vicinity. Particular attention will be paid to the Pen Branch fault.

Stieve, A.

1991-05-15

82

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

83

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.

84

Investigating Drama.  

ERIC Educational Resources Information Center

The purpose of this book is to provide an opportunity for investigating drama by a series of units, each of which examines an aspect of drama or theater. The 20 units discuss such topics as the definition of drama, dialogue in a poem by W. H. Auden, various aspects of the stage, improvisation, the visual impact of plays, "The Death of Grass" by…

Pickering, Kenneth; And Others

85

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

86

Insect Investigations  

NSDL National Science Digital Library

This activity is a field investigation or bio-blitz where students are collecting as many different types of insects as they can. Back in the lab, they will record their findings, sort and classify the insects found. This will lead into a class discussion on biodiversity and the importance of insects and their benefits all living things.

87

Soil Investigations  

NSDL National Science Digital Library

Students learn the basics about soil, including its formation through the cycling of the Earth's materials, as well as its characteristics and importance. They are also introduced to soil profiles and how engineers conduct site investigations to learn about soil quality for development, contamination transport, and assessing the general environmental health of an area.

Integrated Teaching And Learning Program

88

Site Investigation  

NSDL National Science Digital Library

Authors Clayton, Matthews and Simon offer their work, titled "Site Investigation," for free download. The text is broken up into chapters, and can be accessed together or separately. Additionally, users can also access a free copy of "Critical State Soil Mechanics" by authors Schofield and Wroth.

Clayton, C. R.; Matthews, M. C.; Simons, N. E.

2008-10-15

89

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

90

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

91

INVESTIGATION OF \\  

Microsoft Academic Search

Poster - The performance of a single-cell cavity made of RRR > 200 large-grain niobium has been investigated as a function of material removal by buffered chemical polishing. Temperature maps of the cavity surface at 1.7 and 2.0 K were taken for each step of chemical etching and revealed several 'hot-spots', which contribute to the degradation of the cavity quality

Gianluigi Ciovati; Peter Kneisel

2006-01-01

92

Investigating Invasives  

NSDL National Science Digital Library

Invasive species, commonly known as "invasives," are nonnative plants, animals, and microbes that completely take over and change an established ecosystem. The consequences of invasives' spread are significant. In fact, many of the species that appear on the Endangered Species list are threatened by invasives. Therefore, the topic of invasive nonnative species can provide the focus for projects that engage students in authentic science investigations. Here the author describes how she launched her students into a study of invasives while supporting their local environment using the 5E Learning Cycle (engage, explore, explain, extend, evaluate).

Lightbody, Mary

2008-11-01

93

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

94

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.

95

Robust control of a Shunt Active Power Filter for the medium voltage range based on a three-level Neutral Point Clamped converter  

Microsoft Academic Search

This paper presents a modelling procedure and a robust control technique applied to three phase voltage source shunt active filters. The modelling is based on the abc\\/dq transformation of the AC system variables. The currents injected by the active filter are controlled in the synchronous orthogonal dq frame. A new robust control technique for three-phase shunt active power filters based

Alejandro Munduate; Gabriel Garcerá; Emilio Figueres

2006-01-01

96

Clinical Investigation Program Report.  

National Technical Information Service (NTIS)

Subject report identifies the research activities conducted by Dwight David Eisenhower Army Medical Center investigators through protocols approved by the Institutional Review Committee for registration with the Department of Clinical Investigation during...

K. M. Plowman

1993-01-01

97

IDEAS FOR SCIENCE INVESTIGATIONS.  

ERIC Educational Resources Information Center

IDEAS FOR SCIENCE INVESTIGATIONS FOR SECONDARY SCHOOL STUDENTS ARE DESCRIBED. IN PART I THE STUDENT IS INTRODUCED TO THE IDEA OF THE PROJECT-TYPE INVESTIGATION AND IS GIVEN A GENERAL OVERVIEW OF THE MANUAL. A SECTION WHICH IS WRITTEN FOR THE TEACHER INCLUDES A DISCUSSION OF (1) EDUCATIONAL VALUES DERIVED FROM INDIVIDUAL INVESTIGATIONS, AND (2) THE…

SHOWALTER, VICTOR M.; SLESNICK, IRWIN L.

98

Success with Investigations.  

ERIC Educational Resources Information Center

Describes strategies for facilitating student science investigations and alleviating common weaknesses associated with student performance. Includes checklist criteria for performance on investigative tasks and an example of an assessment rubric for the investigation of the effect of temperature on enzyme activity. (Author/KHR)

Chin, Christine

2003-01-01

99

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.

100

Let's Investigate Mars  

NSDL National Science Digital Library

In this activity, students will formulate an original question based on recent Mars robotic investigations and design an original, collaborative inquiry investigation. They will then present their inquiry question and investigation to the class and revise the investigation based on feedback from the class. The activity is designed to accompany the Kids' Science News Network (KSNN) 21st Century Explorer 30-second news break entitled 'Why Do We Want to Study and Travel to Mars?' The activity includes a teacher's guide and instructions for students, and a Spanish translation is available.

101

Investigational Drug Steering Committee  

Cancer.gov

The NCI Investigational Drug Steering Committee (IDSC) was established in November 2005. The IDSC is composed of the Steering Committee, ten task forces, and three working groups. Members of the IDSC include the principal investigators of NCI's early drug development grants and contracts, representatives from the Cooperative Groups, a patient advocate, biostatisticians, and NCI staff.

102

Exploring Earth Investigations  

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. Exploring Earth Investigations were created by Houghton-Mifflin/McDougal-Littell in collaboration with TERC.

2008-07-01

103

Soil Compaction Investigation.  

ERIC Educational Resources Information Center

Describes a lab investigation designed to introduce students to soil compaction and help them to learn to design and adapt procedures that scientists use when they plan and conduct controlled investigations. Provided are objectives, a list of materials, procedures, and a sample student handout. (CW)

Turski, Mark P.

1988-01-01

104

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

105

Investigations: Building Mathematics.  

ERIC Educational Resources Information Center

These activities invite students to use mathematics to explore interesting facts about famous buildings. The investigation for grades three to four focuses on the SkyDome, a sports arena in Toronto, Canada, and the investigation for grades five to six discusses the Empire State Building in New York City. Includes reproducible student worksheets.…

Small, Marian S.

1996-01-01

106

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

107

Designing Online Mathematical Investigation  

ERIC Educational Resources Information Center

In this paper we focus on interactive visualizations that support mathematical investigation. In the context of analyzing and redesigning an interactive visualization from the National Council of Teachers of Mathematics's (NCTM's) Illuminations Web site, we consider two interrelated issues: (1) how the pedagogy of mathematical investigation may be…

Gadanidis, George; Sedig, Kamran; Liang, Hai-Ning

2004-01-01

108

Maritime accident investigation methodologies.  

PubMed

Whenever a naval disaster occurs, a public outcry is heard to a full investigation into the causes of the event. Although the maritime industry has an outstanding reputation in accident investigation, such investigations are hardly conducted in inland shipping or leisure craft sailing. Due to a number of serious accidents in the maritime sector and increasing interest by public and media, the philosophy of independent investigations has gained interest at a policy making level in the European Union and with international NGO's, such as the International Maritime Organization IMO. The purpose of this paper is to discuss the application of this methodology in all segments of shipping. The paper elaborates a conceptual model, principle processes and available techniques as a common orientation to safety-focused investigations. Accident investigation reports of Dutch investigative agencies are benchmarked to this model assessing the potential of the approach to all segments of shipping. It shows the applicability to minor as well as major accidents and the importance of independence. Systemic deficiencies at all levels in safety of shipping are identified and a generic applicability is demonstrated. It is concluded that independent accident investigation provides a powerful diagnostic tool for reducing the peril of drowning. PMID:14664367

Stoop, J A

2003-12-01

109

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.

Gupta, Vishali; Gupta, Amod

2013-01-01

110

Microgravity silicon zoning investigation  

NASA Technical Reports Server (NTRS)

The flow instabilities in floating zones of silicon were investigated and methods for investigation of these instabilities in microgravity were defined. Three principal tasks were involved: (1) characterization of the float zone in small diameter rods; (2) investigation of melt flow instabilities in circular melts in silicon disks; and (3) the development of a prototype of an apparatus that could be used in near term space experiments to investigate flow instabilities in a molten zone. It is shown that in a resistance heated zoner with 4 to 7 mm diameter silicon rods that the critical Marangoni number is about 1480 compared to a predicted value of 14 indicative that viable space experiments might be performed. The prototype float zone apparatus is built and specifications are prepared for a flight zoner should a decision be reached to proceed with a space flight experimental investigation.

Kern, E. L.; Gill, G. L., Jr.

1985-01-01

111

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

112

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

113

Standardizing Contact Investigation Protocols  

PubMed Central

SUMMARY SETTING: The State of Alabama Department of Public Health Division of Tuberculosis Control. OBJECTIVE: To standardize contact investigation protocols and implement an intervention to increase TB field worker adherence to the protocols with the goal of promoting efficiency and effectiveness in contact investigations. DESIGN: A process evaluation of existing data collection and management systems and protocols was performed. Standardized protocols and an intervention to increase TB field worker adherence to the protocols were created and pilot tested. These were then implemented and formative evaluation data were collected. RESULTS: The process evaluation revealed considerable variance among field workers with regard to protocols and definitions of variables related to contact investigations. Protocols were standardized and an intervention targeted at TB field workers was developed. The intervention consisted of a training workshop and the development of a computer-based contact investigation module. This was successfully implemented throughout the state. CONCLUSIONS: To perform effective contact investigations and conduct studies to improve the effectiveness of these investigations, TB control programs must pay careful attention to precisely defining variables and concepts related to the contact investigation. Furthermore, protocols must be standardized and resources devoted to training of TB field workers to ensure adherence to protocols.

Gerald, L. B.; Bruce, F.; Brooks, C. M.; Brook, N.; Kimerling, M. E.; Windsor, R. A.; Bailey, W. C.

2006-01-01

114

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?

115

Hells Canyon Environmental Investigation.  

National Technical Information Service (NTIS)

The results of an environmental investigation of the nonpower impacts on the Hells Canyon Complex resulting from water budget participation are presented. The water budget plan would increase flows in the Columbia and Snake Rivers between April 15 and Jun...

1984-01-01

116

Canopy Glint Screening Investigation.  

National Technical Information Service (NTIS)

This report presents the results of a program which investigated alternatives to flat-plate canopy concepts to control helicopter visual detection cues and to reduce internal reflections. During the program, full-scale soft mockups were constructed, teste...

D. R. Gundling S. J. Blewitt

1978-01-01

117

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

118

Clinical Investigation Program Report.  

National Technical Information Service (NTIS)

Subject report identifies the research activities conducted by Dwight David Eisenhower Army Medical Center investigators during Fiscal Year 1988, and other known publications and presentations by the Dwight David Eisenhower Army Medical Center professiona...

K. M. Plowman

1988-01-01

119

Resources for Investigators  

Cancer.gov

Resources for Investigators Biorepositories Information about accessing biospecimens collected from DCP-supported clinical trials and projects. Clinical Trials Prevention and detection trials sponsored by NCI. Statistical Software Other NCI Resources Back

120

Mineralogical Investigations of Fractures.  

National Technical Information Service (NTIS)

Optical microscopy, X-ray diffraction, and chemical analyses have been used to identify fracture filling minerals from areas at Finnsjoen, Uppland and Sternoe, Blekinge. These areas were selected, as investigation areas in order to study geological condit...

S. A. Larsson E. L. Tullborg S. Lindblom

1981-01-01

121

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

122

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...

123

Wingship Investigation. Volume 1.  

National Technical Information Service (NTIS)

The Advanced Research Projects Agency (ARPA) has completed an investigation of Wingship concepts and technologies to examine their relevance and utility in future defense applications. A select team of technical experts from U.S. Government and industry w...

1994-01-01

124

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

125

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

126

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.

127

Skylab EREP Investigations Summary  

NASA Technical Reports Server (NTRS)

The problems in the areas of agriculture, range and forestry; land use and cartography; geology and hydrology; oceans atmosphere, and data analysis techniques were investigated and summarized using Earth Resources Experiment Package (EREP) data.

Pierson, W. J. (editor)

1978-01-01

128

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

129

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).

130

Old Faithful Plumbing Investigation  

NSDL National Science Digital Library

This activity (located on page 3 of the PDF) is a full inquiry investigation into mapping the underground âplumbingâ of geysers. Groups of learners will mimic an actual investigation into the underground plumbing of Old Faithful by dividing into groups, designing a plumbing system to hide in a cardboard box, then testing other boxes with a probe and making sketches of the hidden plumbing based on their observations. Relates to linked video, DragonflyTV GPS: Geysers.

Twin Cities Public Television, Inc.

2007-01-01

131

Subsonic Scarf Inlets Investigated  

NASA Technical Reports Server (NTRS)

A computational investigation is underway at the NASA Glenn Research Center to determine the aerodynamic performance of subsonic scarf inlets. These inlets are characterized as being longer over the lower portion of the inlet, as shown in the preceding figure. One of the key variables being investigated in the research is the circumferential extent of the longer portion of the inlet. It shows two specific geometries that are being examined: one in which the length of the inlet transitions from long-to-short over the full 180 deg. from bottom to top, and a second in which the length transitions over 67.5 deg.

Abbott, John M.

2005-01-01

132

[Investigation of hyperhomocysteinemia].  

PubMed

Hyperhomocysteinemia has been described as a risk factor for venous and arterial thromboembolic diseases but may be also involved in neurodegenerative and neuropsychiatric disorders. Considering some arguments for homocysteine (Hcy) toxicity, a systematic investigation tool of hyperhomocysteinemia is needed. Understanding of the complexity of homocysteine metabolism can help to improve etiologic diagnosis of hyperhomocysteinemia, especially in determining the genetic or nutritional origin of the anomaly. We propose here a brief description of different clinical presentations and a strategy for biological investigation of hyperhomocysteinemia. PMID:24113437

Veyrat-Durebex, Charlotte; Blasco, Hélène; Crinier, Julie; Vayne, Caroline; Emond, Patrick; Labarthe, François; Andres, Christian R; Maillot, François

2013-01-01

133

Investigating the Line  

NSDL National Science Digital Library

In the related activity called "Colors Collide or Combine," learners are intrigued by the apparent "line" that forms where colors from M&M coatings meet but do not mix. In this activity, learners investigate whether this non-mixing property is unique to M&M's and find that it happens whenever similar liquids come together.

Kessler, James H.; Galvan, Patricia M.

2007-01-01

134

Classroom Assessment Investigations.  

ERIC Educational Resources Information Center

Describes a multifaceted study that combined quantitative and qualitative approaches to educational research to investigate the behaviors and perceptions of preservice teachers as they assessed the work of an imaginary eighth grader. Summarizes findings and suggests that the mixed-methods model contributes new understandings not possible with…

Wilson, Robert J.

1999-01-01

135

Investigations into Character Enhancement.  

ERIC Educational Resources Information Center

Presents six different investigations of character enhancement that attempts to answer three questions: (1) who are you; (2) what is your destination; and (3) who is your captain? Intends to build relationships among ideas such as perspective taking, seeing and making connections with the other, and understanding more about ethical development.…

Hartoonian, H. Michael

2001-01-01

136

Investigating Nitrogen Dioxide  

NSDL National Science Digital Library

Students will investigate Nitrogen Dioxide levels in the atmosphere during a one year time span using data sets from MyNASAData website. They will draw conclusions about what factors around the world effect NO2 levels (season, population, industry, etc.)

137

Resources for Investigators  

Cancer.gov

Resources for Investigators NCI Links NIH Links Other Links Clinical Trials Management Resource Website NCI CTC v2.0 and CTCAE v3.0 NCI Booklet: "Taking Part in Clinical Trials: Cancer Prevention Studies; What Participants Need to Know" NCI

138

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

139

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

140

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

141

Investigating cosmic ray coincidences  

NASA Astrophysics Data System (ADS)

Every laboratory has its own supply of high energy particles. Secondary cosmic rays provide a sea level flux of muons at a rate of about 1 cm-2 min-1. This article describes an extracurricular A-level investigation that indicates muon-electron collisions in the roof of the laboratory.

Dunne, Peter; Miller, Alex

2001-07-01

142

INVESTIGATING LASER SCANNER ACCURACY  

Microsoft Academic Search

Questions concerning the quality and accuracy of the recorded 3D points of laser scanners recei ve little attention. In a resear ch project, i3mainz has installed a number of different test target s that allow an investigation in the quality of points recorded by laser scanners and the geometric models derived from the point clouds. The standardized tests also allow

W. Boehler; M. Bordas Vicent; A. Marbs

2003-01-01

143

The Independent Investigation Method.  

ERIC Educational Resources Information Center

The Independent Investigation Method is presented, a model developed to enable gifted students to grow in their independence as they move through a research assignment. The seven-step process guides elementary students from beginning to end in the research process, including topic, goal setting, research, organizing, goal evaluation, product, and…

Morse, Virginia; Nottage, Cindy

2001-01-01

144

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

145

Ice Core Investigations  

NSDL National Science Digital Library

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 pollution to create a meaningful science learning experience for students.

Krim, Jessica; Brody, Michael

2008-09-01

146

The "Philosophical Investigations'" Children  

ERIC Educational Resources Information Center

In her book on Wittgenstein's "Philosophical Investigations", Beth Savickey points out that few critics pay explicit attention to Wittgenstein's references to the child and childhood, particularly in his later work. She argues (paraphrasing Wittgenstein) that "the figure of the child is the figure that draws together the concepts of teaching and…

Lesnik-Oberstein, Karin

2003-01-01

147

Introduction to Biological Investigations  

NSDL National Science Digital Library

Introduction to Biological Investigations is a course that was developed to introduce the scientific method through practical application. This active, student-centered experience fosters fundamental skills that promote creativity, critical thinking, and scientific communication. The course has been well received by first-year students, and assessment results have been highly positive.

Fitzpatrick, Kathleen A.; Foote, Linda C.

2004-11-01

148

Investigations in Martian Sedimentology.  

National Technical Information Service (NTIS)

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 ...

J. M. Moore

1998-01-01

149

Investigational Drug Steering Committee  

Cancer.gov

The Investigational Drug Steering Committee (IDSC) was established following recommendations by the Clinical Trials Working Group (CTWG) and Institute of Medicine (IOM). The IDSC was created to collaborate with NCI in the design and prioritization of early phase drug development trials with agents for which CTEP holds an IND.

150

Charles Darwin's Botanical Investigations  

ERIC Educational Resources Information Center

Charles Darwin's botanical studies provide a way to expose students to his work that followed the publication of "On the Origin of Species." We can use stories from his plant investigations to illustrate key concepts in the life sciences and model how questions are asked and answered in science.

Harley, Suzanne M.

2010-01-01

151

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

152

Seasonal Change Investigations  

ERIC Educational Resources Information Center

The author describes how the yearlong Investigating Seasonal Change at North Ponds project enabled third-grade students to take on the role of environmental scientists, recording and analyzing environmental data from ponds near their school. The students used an array of technological tools to explore and report on the causes and effects of…

Smith, Wendy

2009-01-01

153

Energetic Particles Investigation (EPI)  

Microsoft Academic Search

The Energetic Particles Investigation (EPI) instrument operates during the pre-entry phase of the Galileo Probe. The major science objective is to study the energetic particle population in the innermost regions of the Jovian magnetosphere — within 4 radii of the cloud tops — and into the upper atmosphere. To achieve these objectives the EPI instrument will make omnidirectional measurements of

H. M. Fischer; J. D. Mihalov; L. J. Lanzerotti; G. Wibberenz; K. Rinnert; F. O. Gliem; J. Bach

1992-01-01

154

Investigation of semiconductors  

NSDL National Science Digital Library

This investigation involves a web quest and simulation to help students learn about the make-up and functioning of semiconductors as well as some applications. They will learn about p and n type materials, the pn junction, and what happens when an outside EMF source is added.

Shenk, Lynne

155

Investigating an issue  

NSDL National Science Digital Library

This critical thinking guide introduces students to a three-stage process for investigating an issue. The three stages include discovering and defining, delving deep, and responding to the issue. A student tip sheet explains each stage and enables students to work through the processes in a step-by-step manner while seeing how the information is tied together. Students identify, explore, and critically summarize the information concerning their issue. A graphic organizer provides students with an opportunity to evaluate the issue they have researched. A brief outline of the three stages provides students with a handy summary for use while investigating an issue. The activity sheets are in pdf format and are provided as part of a site about the future of energy. Copyright 2005 Eisenhower National Clearinghouse

Project, Iowa P.

2004-01-01

156

Geophysical investigations in Jordan  

USGS Publications Warehouse

A number of geophysical investigations have been undertaken in the Hashemite Kingdom of Jordan to provide data for understanding the tectonic framework, the pattern of seismicity, earthquake hazards and geothermal resources of the country. Both the historical seismic record and the observed recent seismicity point to the dominance of the Dead Sea Rift as the main locus of seismic activity but significant branching trends and gaps in the seismicity pattern are also seen. A wide variety of focal plane solutions are observed emphasizing the complex pattern of fault activity in the vicinity of the rift zone. Geophysical investigations directed towards the geothermal assessment of the prominent thermal springs of Zerga Ma'in and Zara are not supportive of the presence of a crustal magmatic source. ?? 1990.

Kovach, R. L.; Andreasen, G. E.; Gettings, M. E.; El-Kaysi, K.

1990-01-01

157

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

158

Rocket Motor Microphone Investigation  

NASA Technical Reports Server (NTRS)

At ATK's facility in Utah, large full-scale solid rocket motors are tested. The largest is a five-segment version of the reusable solid rocket motor, which is for use on the Ares I launch vehicle. As a continuous improvement project, ATK and BYU investigated the use of microphones on these static tests, the vibration and temperature to which the instruments are subjected, and in particular the use of vent tubes and the effects these vents have at low frequencies.

Pilkey, Debbie; Herrera, Eric; Gee, Kent L.; Giraud, Jerom H.; Young, Devin J.

2010-01-01

159

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

160

Investigating With Charles Darwin  

NSDL National Science Digital Library

Naturalist Charles Darwin made observations, conducted experiments, and kept detailed notebooks of his findings throughout his life. He was regularly transfixed by his observations of the natural world, whether in his early collecting days, during his legendary voyage on the Beagle , or on his daily walks in later life through the British countryside. This article offers two scientific investigations to deepen students' understandings of not only how science operates, but how Darwin in particular, approached analysis of the natural world.

Eichinger, John

2008-10-01

161

Cassini Plasma Spectrometer Investigation  

Microsoft Academic Search

The Cassini Plasma Spectrometer (CAPS) will make comprehensive three-dimensional mass-resolved measurements of the full variety of plasma phenomena found in Saturn’s magnetosphere. Our fundamental scientific goals are to understand the nature of saturnian plasmas primarily their sources of ionization, and the means by which they are accelerated, transported, and lost. In so doing the CAPS investigation will contribute to understanding

D. T. Young; J. J. Berthelier; M. Blanc; J. L. Burch; A. J. Coates; R. Goldstein; M. Grande; T. W. Hill; R. E. Johnson; V. Kelha; D. J. Mccomas; E. C. Sittler; K. R. Svenes; K. Szegö; P. Tanskanen; K. Ahola; D. Anderson; S. Bakshi; R. A. Baragiola; B. L. Barraclough; R. K. Black; S. Bolton; T. Booker; R. Bowman; P. Casey; F. J. Crary; D. Delapp; G. Dirks; N. Eaker; H. Funsten; J. D. Furman; J. T. Gosling; H. Hannula; C. Holmlund; H. Huomo; J. M. Illiano; P. Jensen; M. A. Johnson; D. R. Linder; T. Luntama; S. Maurice; K. P. Mccabe; K. Mursula; B. T. Narheim; J. E. Nordholt; A. Preece; J. Rudzki; A. Ruitberg; K. Smith; S. Szalai; M. F. Thomsen; K. Viherkanto; J. Vilppola; T. Vollmer; T. E. Wahl; M. Wüest; T. Ylikorpi; C. Zinsmeyer

2004-01-01

162

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

163

Colored Shadows Investigation  

NSDL National Science Digital Library

This activity (located on page 3 of the PDF) is a full inquiry investigation into mixing colors with light. Groups of learners will set up colored lights in a darkened room and record the color of shadows cast by each color. They will continue to collect data as they experiment with combinations of multiple colored lights and produce a data table to organize their findings. Relates to linked video, DragonflyTV GPS: Light and Color.

Twin Cities Public Television, Inc.

2006-01-01

164

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

165

Investigational Approaches for Mesothelioma  

PubMed Central

Malignant pleural mesothelioma (MPM) is a rare, aggressive tumor with a poor prognosis. In view of the poor survival benefit from first-line chemotherapy and the lack of subsequent effective treatment options, there is a strong need for the development of more effective treatment approaches for patients with MPM. This review will provide a comprehensive state of the art of new investigational approaches for mesothelioma. In an introductory section, the etiology, epidemiology, natural history, and standard of care treatment for MPM will be discussed. This review provide an update of the major clinical trials that impact mesothelioma treatment, discuss the impact of novel therapeutics, and provide perspective on where the clinical research in mesothelioma is moving. The evidence was collected by a systematic analysis of the literature (2000–2011) using the databases Medline (National Library of Medicine, USA), Embase (Elsevier, Netherlands), Cochrane Library (Great Britain), National Guideline Clearinghouse (USA), HTA Database (International Network of Agencies for Health Technology Assessment – INAHTA), NIH database (USA), International Pleural Mesothelioma Program – WHOLIS (WHO Database), with the following keywords and filters: mesothelioma, guidelines, treatment, surgery, chemotherapy, radiotherapy, review, investigational, drugs. Currently different targeted therapies and biologicals are under investigation for MPM. It is important that the molecular biologic research should first focus on mesothelioma-specific pathways and biomarkers in order to have more effective treatment options for this disease. The use of array technology will be certainly an implicit gain in the identification of new potential prognostic or biomarkers or important pathways in the MPM pathogenesis. Probably a central mesothelioma virtual tissue bank may contribute to the ultimate goal to identify druggable targets and to develop personalized treatment for the MPM patients.

Surmont, Veerle F.; van Thiel, Eric R. E.; Vermaelen, Karim; van Meerbeeck, Jan P.

2011-01-01

166

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

167

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

168

Apollo light flash investigations  

NASA Technical Reports Server (NTRS)

The visual phenomenon of light flashes resulting from high energy, heavy cosmic rays penetrating the command module structure and crewmembers' eyes is investigated. Light flash events observed during dedicated sessions on Apollo 15, 16, 17 are described along with a Monte Carlo simulation of the exposure of an astronaut to cosmic radiation during a mission. Results of the Apollo Light Flash Moving Emulsion Detector experiment developed for Apollo 16 and 17 to obtain a direct record of incident cosmic ray particles are correlated with crewmembers' reports of light flashes.

Osborne, W. Z.; Pinsky, L. S.; Bailey, J. V.

1975-01-01

169

Investigating Climate Change Evidence  

NSDL National Science Digital Library

This activity uses the jigsaw method to encourage students, in groups, to become experts on different types of evidence as a means of understanding climate change. Each group focuses on a topic, highlights at least one data set within that topic, and researches the data collection process along with the potential consequences of the evidence. Students are asked to critique the evidence they investigate, using a prepared checklist, and to share the results of their research with their classmates. Finally, students evaluate the evidence behind a skepticÃÂs claim, and discuss the knowns and unknowns about climate change.

Harris, Cornelia

2012-02-24

170

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.

171

Solar Physics Investigations  

NASA Astrophysics Data System (ADS)

Seven different solar physics experiments have been flown on the Spacelab facility. In the following we shall refer to them by their acronymes as follows: ACRIM - Active Cavity Radiometer Irradiance Monitor. The primary objective is to determine the degree and direction of possible fluctuations in the sun's total output of optical energy (x-rays to microwave wavelengths)by measuring the total solar optical irradiance outside the earth's atmosphere. SUSIM - Solar Ultraviolet Spectral Irradiance Monitor. The objective is to determine both long-term and short-term variations of the total ultraviolet flux emitted by the sun. SOLSPEC - Solar Spectrum Measurement from 180 to 3200 Nanometers. The objective is to measure the solar energy in the ultraviolet, visible and infrared parts of the spectrum, and to determine the amounts of energies in this spectral irradiance, and how they change with time. SOLCON - Measurement of the Solar Constant. The purposes are to measure the absolute value of the total solar irradiance and to detect and measure long-term variations that may exist in its absolute value. SOUP - Solar Optical Universal Polarimeter. The objectives of the experiment are: to measure magnetic and velocity fields in the solar atmosphere; to follow the evolution of solar magnetic structures over periods of several days to determine how magnetic elements couple to the supergranula velocity patterns and by what mechanisms field diffusion and disappearance occur; to study with high temporal and spatial resolution the magnetic field changes associated with transient events; and to provide a test of the pointing accuracy and stability of the Instrument Pointing System (IPS) to sub-arc second accuracy. CHASE - Coronal Helium Abundance Spacelab Experiment. The goal of this experiment is to determine accurately the helium abudance of sun. HRTS Solar Ultraviolet High Resolution Telescope and Spectrograph. Purpose: to investigate the energy transport and mass balance of the temperature minimum, chromosphere, transition zone, and corona in the quiet sun as well as in plages, flares and sunspots; to study the velocity field of the lower corona in order to investigate the origin of the solar wind; to investigate the structure of spicules and superspicules; to investigate the structure and dynamics of prominences; and to study the preflare and flare phenomena.

Tandberg-Hanssen, Einar

1999-08-01

172

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

173

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

174

Investigation of Surtsey Volcano  

NASA Astrophysics Data System (ADS)

The volcanic island of Surtsey, Iceland, was built during the period November 1963 to June 1967 and is one of the few oceanic volcanic islands that has formed and survived in recent times. New stimulus to geologic work on the island was provided in 1979 by completion of a 181-m-deep hole that was drilled to investigate the structure of the volcano and the active hydrothermal system below.During August 1985 an international group of researchers undertook a series of geologic and biologic investigations on the island. This work was facilitated by new aerial photographs taken by the Icelandic Geodetic Survey and a new bathymetric map of the Surtsy region made by the Icelandic Hydrographic Service (both in Reykjavik). Ground surveying of markers appearing in the photographs will permit a major revision of the to pographic map of the island (scale 1:5000). The new bathymetry defines the extent of continuing erosion of three volcanic vents, two of which formed short-lived islands during the Surtsey eruptive episode. Since 1967, when the first bathymetry of these submarine features was made, the summitt errace of Syrtlingur has been reduced from 23 to 32 m below sea level; that of Jolnir, from 15 to 37 m; and that of Surtla, from 32 t o 46 m.

Moore, James G.; Jakobsson, Sveinn P.; Norrman, John O.

175

SADM potentiometer anomaly investigations  

NASA Astrophysics Data System (ADS)

During the last 3 years Contraves Space have been developing a Low Power (1-2kW) Solar Array Drive Mechanism (SADM) aimed at small series production. The mechanism was subjected to two test programmes in order to qualify the SADM to acceptable levels. During the two test programmes, anomalies were experienced with the Potentiometers provided by Eurofarad SA and joint investigations were undertaken to resolve why these anomalies had occurred. This paper deals with the lessons learnt from the failure investigation on the two Eurofarad (rotary) Potentiometer anomaly. The Rotary Potentiometers that were used were fully redundant; using two back to back mounted "plastic tracks". It is a pancake configuration mounted directly to the shaft of the Slip Ring Assembly at the extreme in-board end of the SADM. It has no internal bearings. The anomaly initially manifested itself as a loss of performance in terms of linearity, which was first detected during Thermal Vacuum testing. A subsequent anomaly manifested itself by the complete failure of the redundant potentiometer again during thermal vacuum testing. This paper will follow and detail the chain of events following this anomaly and identifies corrective measures to be applied to the potentiometer design and assembly process.

Wood, Brian; Mussett, David; Cattaldo, Olivier; Rohr, Thomas

2005-07-01

176

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

177

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.

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

2012-01-01

178

Young Investigator Award symposium.  

PubMed

This article highlights the research presented at the inaugural meeting of Alcoholism and Stress: A Framework for future Treatment Strategies. This meeting was held on May 6-8, 2008 in Volterra, Italy. It is an international meeting dedicated to developing preventive strategies and pharmacotherapeutic remedies for stress- and alcohol-related disorders. For the first time, the National Institute on Alcohol Abuse and Alcoholism (NIAAA) conferred a Young Investigator Award to promote the work of young researchers and highlight their outstanding achievements in the fields of addiction medicine and stress disorders. The awardees were Dr. Katie Witkiewitz (University of Washington), Dr. Andrew Holmes (NIAAA), Dr. Lara A. Ray (Brown University), Dr. James Murphy (University of Memphis), and Dr. Heather Richardson (The Scripps Research Institute). The symposium was chaired by Drs. Fulton Crews and Antonio Noronha. PMID:19913193

Witkiewitz, Katie; Holmes, Andrew; Ray, Lara A; Murphy, James G; Richardson, Heather N; Chen, Yi-Chyan; McDevitt-Murphy, Meghan E; Cruz, Maureen T; Roberto, Marisa

2009-11-01

179

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

180

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

181

Rosetta Radio Science Investigations  

NASA Technical Reports Server (NTRS)

The Rosetta Radio Science Investigations (RSI) experiment was selected by the European Space Agency to be included in the International Rosetta Mission to comet P/Wirtanen (launch in 2003, arrival and operational phase at the comet 2011-2013). The RSI science objectives address fundamental aspects of cometary physics such as the mass and bulk density of the nucleus, the gravity field, non-gravitational forces, the size and shape, the internal structure, the composition and roughness of the nucleus surface, the abundance of large dust grains and the plasma content in the coma and the combined dust and gas mass flux on the orbiter. RSI will make use of the radio system of the Rosetta spacecraft.

Patzold, M.; Neubauer, F. M.; Wennmacher, A.; Aksnes, K.; Anderson, J. D.; Asmar, S. W.; Tinto, M.; Tsurutani, B. T.; Yeomans, D. K.; Barriot, J. -P.; Bird, M. K.; Boehnhardt, H.; Gill, E.; Montenbruck, O.; Grun, E.; Hausler, B.; Ip, W. H.; Thomas, N.; Marouf, E. A.; Rickman, H.; Wallis, M. K.; Wickramasinghe, N. C.

1996-01-01

182

Gear Crack Propagation Investigation  

NASA Technical Reports Server (NTRS)

Reduced weight is a major design goal in aircraft power transmissions. Some gear designs incorporate thin rims to help meet this goal. Thin rims, however, may lead to bending fatigue cracks. These cracks may propagate through a gear tooth or into the gear rim. A crack that propagates through a tooth would probably not be catastrophic, and ample warning of a failure could be possible. On the other hand, a crack that propagates through the rim would be catastrophic. Such cracks could lead to disengagement of a rotor or propeller from an engine, loss of an aircraft, and fatalities. To help create and validate tools for the gear designer, the NASA Lewis Research Center performed in-house analytical and experimental studies to investigate the effect of rim thickness on gear-tooth crack propagation. Our goal was to determine whether cracks grew through gear teeth (benign failure mode) or through gear rims (catastrophic failure mode) for various rim thicknesses. In addition, we investigated the effect of rim thickness on crack propagation life. A finite-element-based computer program simulated gear-tooth crack propagation. The analysis used principles of linear elastic fracture mechanics, and quarter-point, triangular elements were used at the crack tip to represent the stress singularity. The program had an automated crack propagation option in which cracks were grown numerically via an automated remeshing scheme. Crack-tip stress-intensity factors were estimated to determine crack-propagation direction. Also, various fatigue crack growth models were used to estimate crack-propagation life. Experiments were performed in Lewis' Spur Gear Fatigue Rig to validate predicted crack propagation results. Gears with various backup ratios were tested to validate crack-path predictions. Also, test gears were installed with special crack-propagation gages in the tooth fillet region to measure bending-fatigue crack growth. From both predictions and tests, gears with backup ratios (rim thickness divided by tooth height) of 3.3 and 1.0 produced tooth fractures, whereas a backup ratio of 0.3 produced rim fractures. For a backup ratio of 0.5, the experiments produced rim fractures and the predictions produced both rim and tooth fractures, depending on the initial geometry of the crack. Good correlation between predicted and measured crack growth was achieved when the fatigue crack-closure concept was introduced into the analysis. As the gear rim thickness decreased, the compressive cyclic stress in the gear-tooth fillet region increased. This retarded crack growth and increased the number of crack-propagation cycles to failure.

1995-01-01

183

Tape recorder failure investigation  

NASA Technical Reports Server (NTRS)

Two end-item tape recorders lost 4:1 mode data recording mode capability at less than half of their 1 6,000-cycle, 4-year operating life. Subsequent life tests on two spare recorders also experienced 4:1 mode data loss at 8,000 and 11,700 cycles. Tear down inspection after completion of the life tests showed that the tape had worn through the alfesil record and reproduce heads. An investigation was initiated to understand the cause of excessive tape head wear and the reasons why the 4:1 mode data rate, low-speed mode is more damaging than the 1:1 mode data rate, high-speed recording mode. The objective was to establish how operating conditions (tape speed, humidity, temperature, stop/start cycles) affects head life with the goal of extending head life on the remaining in-service tape recorders. Another interest was to explain why an earlier vendor life test showed capability beyond 16,000 cycles.

Higgins, M. D.; Loewenthal, S. H.; Carnahan, C. C.; Snyder, G. L.

1996-01-01

184

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

185

Gear crack propagation investigations  

NASA Technical Reports Server (NTRS)

Analytical and experimental studies were performed to investigate the effect of gear rim thickness on crack propagation life. The FRANC (FRacture ANalysis Code) computer program was used to simulate crack propagation. The FRANC program used principles of linear elastic fracture mechanics, finite element modeling, and a unique re-meshing scheme to determine crack tip stress distributions, estimate stress intensity factors, and model crack propagation. Various fatigue crack growth models were used to estimate crack propagation life based on the calculated stress intensity factors. Experimental tests were performed in a gear fatigue rig to validate predicted crack propagation results. Test gears were installed with special crack propagation gages in the tooth fillet region to measure bending fatigue crack growth. Good correlation between predicted and measured crack growth was achieved when the fatigue crack closure concept was introduced into the analysis. As the gear rim thickness decreased, the compressive cyclic stress in the gear tooth fillet region increased. This retarded crack growth and increased the number of crack propagation cycles to failure.

Lewicki, David G.; Ballarini, Roberto

1996-01-01

186

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

187

Soldering In Space Investigation  

NASA Technical Reports Server (NTRS)

This video captures Mike Fincke melting solder during the first set of planned In-Space Soldering Investigation (ISSI) experiments onboard the International Space Station (ISS). In the video, Fincke touches the tip of the soldering iron to a wire wrapped with rosin-core solder.Review of the experiment video revealed melting kinetics, wetting characteristics, and equilibrium shape attainment of the solder charge. The main photograph shows the results of feeding solder wire onto a heated surface. Here the solder is still attached with the spool seen floating in the foreground of the image. The inset photograph at right, shows a set of three simple melting experiments in which the solder, not affected by gravity, achieved an unexpected equilibrium football shape on the wire. Samples returned to Earth were examined for porosity and flux distribution as well as micro structural development. ISSI's purpose was to find out how solder behaves in a weightless environment and promote our knowledge of fabrication and repair techniques that might be employed during extended space exploration missions.

2004-01-01

188

Soldering In Space Investigation  

NASA Technical Reports Server (NTRS)

This video captures Mike Fincke melting solder during the first set of planned In-Space Soldering Investigation (ISSI) experiments onboard the International Space Station (ISS). In the video, Fincke touches the tip of the soldering iron to a wire wrapped with rosin-core solder. Review of the experiment video revealed melting kinetics, wetting characteristics, and equilibrium shape attainment of the solder charge. The main photograph shows the results of feeding solder wire onto a heated surface. Here the solder is still attached with the spool seen floating in the foreground of the image. The inset photograph at right, shows a set of three simple melting experiments in which the solder, not affected by gravity, achieved an unexpected equilibrium football shape on the wire. Samples returned to Earth were examined for porosity and flux distribution as well as micro structural development. ISSI's purpose was to find out how solder behaves in a weightless environment and promote our knowledge of fabrication and repair techniques that might be employed during extended space exploration missions.

2004-01-01

189

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

190

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

191

Polarization Agile Tracking Radar Investigation.  

National Technical Information Service (NTIS)

The Phase Return Error Program investigates errors in glint from complex targets and determines means to alleviate them. Mathematical and experimental analysis are used to accomplish this goal. The report presents investigations of polarization agility, i...

J. Hatcher C. Cash R. Currie E. Holliday

1969-01-01

192

Investigating Your Environment. Student Handbook.  

ERIC Educational Resources Information Center

This handbook is designed to encourage students to investigate their environment. The techniques of investigative studies are explained and the means of implementing them are discussed. Environmental problems such as air and water quality, noise pollution, land use, and population studies are the suggested targets of the students' investigations.…

Biological Sciences Curriculum Study, Boulder, CO.

193

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.

194

FOSS Variables FOSS Lifeboat Investigation: Developing Investigable Question, Investigation (Experimentation), and Communicating Results  

NSDL National Science Digital Library

This activity is an extension of the FOSS Variables Lifeboat investigation. Students choose a lifeboats variable to investigate, write up an experiment based on the variable to be tested, test the variable, and create a lifeboats investigation poster to share their results.

Walvatne, Amy

195

Accident/Mishap Investigation System  

NASA Technical Reports Server (NTRS)

InvestigationOrganizer (IO) is a Web-based collaborative information system that integrates the generic functionality of a database, a document repository, a semantic hypermedia browser, and a rule-based inference system with specialized modeling and visualization functionality to support accident/mishap investigation teams. This accessible, online structure is designed to support investigators by allowing them to make explicit, shared, and meaningful links among evidence, causal models, findings, and recommendations.

Keller, Richard; Wolfe, Shawn; Gawdiak, Yuri; Carvalho, Robert; Panontin, Tina; Williams, James; Sturken, Ian

2007-01-01

196

Indoor air quality investigation protocols  

Microsoft Academic Search

Over the past 10 to 15 years, an increasing number of complaints about discomfort and health effects related to indoor air quality (IAQ) have been reported. The increase in complaints has been accompanied by an increase in requests for IAQ investigations. This study presents an overview of the many IAQ investigation protocols published since 1984. For analysis, the protocols are

R. E. Greene; P. L. Williams

1996-01-01

197

A Psychoacoustic Investigation of Foreignness.  

National Technical Information Service (NTIS)

A study was conducted to investigate and measure the foreignness of ten languages. Forty-five listeners judged the relative foreignness of 2250 paired utterances, and ordinal scales were made from their judgments. The purpose of the investigation was to d...

B. L. Alford

1970-01-01

198

Four Investigations of Animal Behavior.  

ERIC Educational Resources Information Center

Describes four techniques for investigating animal behavior in situations where it is relatively easy to obtain meaningful data. Presents investigations for attention responses and habituation of domestic animals to sound stimuli, interaction of lambs and ewes, behavior of lambs in a simple T-maze, and vigilance in birds at a feeder. (JRH)

Cheverton, John

1997-01-01

199

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

200

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.

201

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

202

Solid State Doppler Sensor Investigation.  

National Technical Information Service (NTIS)

The report describes the investigations for a new airborne solid state doppler sensor that provides 3-axis velocity data for doppler navigation with greatly improved accuracy and low lag. Heading velocity estimation within 0.05% is achieved with smoothing...

A. E. Ruvin L. I. Smilen L. Weinberg

1972-01-01

203

Biochemical Investigations on Blood Parasitism.  

National Technical Information Service (NTIS)

A summary is given of the results of an investigation of the nature of blood parasitism by utilizing the obligate intracellular malaria parasite as a model for understanding intracellular parasitism. Selected for study were the quality and quantity of ami...

I. W. Sherman

1970-01-01

204

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

205

78 FR 64026 - Investigative Hearing  

Federal Register 2010, 2011, 2012, 2013

...NTSB Investigative Hearing Officer: Mr. Mike Flanigon_ mike.flanigon@ntsb.gov. Dated: October 21, 2013. Candi R. Bing, Federal Register Liaison Officer. [FR Doc. 2013-25157 Filed 10-24-13; 8:45 am] BILLING CODE...

2013-10-25

206

Investigation of 'Escherichia coli' Enterotoxins.  

National Technical Information Service (NTIS)

The results of the present investigation indicate a new approach to the development of a single vaccine formula which may ultimately be used to confer protection against both cholera and E. coli diarrheal disease in man and domestic animals. Fundamentally...

R. Rappaport

1978-01-01

207

Projects and Investigators - Active Projects  

Cancer.gov

Accordion View View All JavaScript must be enabled to toggle between the accordion and view all options. Supportive and Palliative Care Projects Active Projects | Completed Projects Caregiver Issues Principal Investigator / Institution Title of Grant

208

Projects and Investigators - Completed Projects  

Cancer.gov

Accordion View View All JavaScript must be enabled to toggle between the accordion and view all options. Supportive and Palliative Care Projects Active Projects | Completed Projects Alopecia Principal Investigator / Institution Title of Grant Grant

209

Fundamental Investigations of Airframe Noise.  

National Technical Information Service (NTIS)

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 experiment...

M. G. Macaraeg

2004-01-01

210

Slotted Metallic RF Window Investigation.  

National Technical Information Service (NTIS)

The design of slotted metallic radomes is investigated theoretically and experimentally. The theory of flat slotted metallic sheets is developed and used to design and analyze flat slotted metallic sheets with various metallic sheets and metal-to-slot rat...

K. Rogers J. Montgomery D. Purinton

1970-01-01

211

Coal Investigations Using Laser Irradiation.  

National Technical Information Service (NTIS)

Conditions necessary to obtain optimum yield of useful products when coal is rapidly heated to extreme temperatures by laser irradiation were determined. Product distribution and yield were investigated as functions of several variables. Low-rank coals wi...

F. S. Karn A.G. Sharkey A.F. Logar R. A. Friedel

1970-01-01

212

Geological Investigation of Uranium Resources.  

National Technical Information Service (NTIS)

A geologic investigation of the Ogcheon uraniferous black shale has been carried out at the northeast of Miweon. Geology of the study area consists of following stratigraphic sequences in ascending order pebbly phyllitic rock formation, lower black slate ...

1983-01-01

213

Investigation of Zerodur Material Processing.  

National Technical Information Service (NTIS)

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, etchin...

R. B. Johnson

1993-01-01

214

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

215

COFS 1 Guest Investigator Program  

NASA Technical Reports Server (NTRS)

The process for selecting guest investigators for participation in the Control of Flexible Structures (COFS)-1 program is described. Contracts and grants will be awarded in late CY87. A straw-man list of types of experiments and a distribution of the experiments has been defined to initiate definition of an experiments package which supports development and validation of control structures interaction technology. A schedule of guest investigator participation has been developed.

Fontana, Anthony; Wright, Robert L.

1986-01-01

216

Hurricane Katrina Wind Investigation Report  

Microsoft Academic Search

This investigation of roof damage caused by Hurricane Katrina is a joint effort of the Roofing Industry Committee on Weather Issues, Inc. (RICOWI) and the Oak Ridge National Laboratory\\/U.S. Department of Energy (ORNL\\/DOE). The Wind Investigation Program (WIP) was initiated in 1996. Hurricane damage that met the criteria of a major windstorm event did not materialize until Hurricanes Charley and

2007-01-01

217

Investigations into geriatric psychiatry challenges: AAGP Senior Investigator Award 2000.  

PubMed

The author summarizes the American Association for Geriatric Psychiatry Senior Investigator Award presentation delivered at the 13th Annual Meeting March 12-15, 2000, in Miami Beach, Florida, and reviews his research studies that define a trajectory leading to investigations of early detection and prevention of Alzheimer's disease (AD). Themes and critical transitions that fostered the research are emphasized, and effective collaboration, mentoring, and timing are discussed. These studies have combined neuroimaging and genetic methods to identify subjects before they develop AD, so that interventions might delay dementia onset. The eventual goal is to translate the clinical research discoveries into modern clinical practice. PMID:11069266

Small, G W

2000-01-01

218

Hurricane Katrina Wind Investigation Report  

SciTech Connect

This investigation of roof damage caused by Hurricane Katrina is a joint effort of the Roofing Industry Committee on Weather Issues, Inc. (RICOWI) and the Oak Ridge National Laboratory/U.S. Department of Energy (ORNL/DOE). The Wind Investigation Program (WIP) was initiated in 1996. Hurricane damage that met the criteria of a major windstorm event did not materialize until Hurricanes Charley and Ivan occurred in August 2004. Hurricane Katrina presented a third opportunity for a wind damage investigation in August 29, 2005. The major objectives of the WIP are as follows: (1) to investigate the field performance of roofing assemblies after major wind events; (2) to factually describe roofing assembly performance and modes of failure; and (3) to formally report results of the investigations and damage modes for substantial wind speeds The goal of the WIP is to perform unbiased, detailed investigations by credible personnel from the roofing industry, the insurance industry, and academia. Data from these investigations will, it is hoped, lead to overall improvement in roofing products, systems, roofing application, and durability and a reduction in losses, which may lead to lower overall costs to the public. This report documents the results of an extensive and well-planned investigative effort. The following program changes were implemented as a result of the lessons learned during the Hurricane Charley and Ivan investigations: (1) A logistics team was deployed to damage areas immediately following landfall; (2) Aerial surveillance--imperative to target wind damage areas--was conducted; (3) Investigation teams were in place within 8 days; (4) Teams collected more detailed data; and (5) Teams took improved photographs and completed more detailed photo logs. Participating associations reviewed the results and lessons learned from the previous investigations and many have taken the following actions: (1) Moved forward with recommendations for new installation procedures; (2) Updated and improved application guidelines and manuals from associations and manufacturers; (3) Launched certified product installer programs; and (4) Submitted building code changes to improve product installation. Estimated wind speeds at the damage locations came from simulated hurricane models prepared by Applied Research Associates of Raleigh, North Carolina. A dynamic hurricane wind field model was calibrated to actual wind speeds measured at 12 inland and offshore stations. The maximum estimated peak gust wind speeds in Katrina were in the 120-130 mph range. Hurricane Katrina made landfall near Grand Isle, Louisiana, and traveled almost due north across the city of New Orleans. Hurricane winds hammered the coastline from Houma, Louisiana, to Pensacola, Florida. The severe flooding problems in New Orleans made it almost impossible for the investigating teams to function inside the city. Thus the WIP investigations were all conducted in areas east of the city. The six teams covered the coastal areas from Bay Saint Louis, Mississippi, on the west to Pascagoula, Mississippi, on the east. Six teams involving a total of 25 persons documented damage to both low slope and steep slope roofing systems. The teams collected specific information on each building examined, including type of structure (use or occupancy), wall construction, roof type, roof slope, building dimensions, roof deck, insulation, construction, and method of roof attachment. In addition, the teams noted terrain exposure and the estimated wind speeds at the building site from the Katrina wind speed map. With each team member assigned a specific duty, they described the damage in detail and illustrated important features with numerous color photos. Where possible, the points of damage initiation were identified and damage propagation described. Because the wind speeds in Katrina at landfall, where the investigations took place, were less than code-specified design speeds, one would expect roof damage to be minimal. One team speculated that damage to all roofs in the area they examined was les

Desjarlais, A. O.

2007-08-15

219

Responsibility-Based Youth Programs Evaluation: Investigating the Investigations.  

ERIC Educational Resources Information Center

Reviews 26 studies that have investigated the impact of the personal-social responsibility model (RM), a physical activity program model, on underserved and/or at-risk youth since its inception. Results indicate that field research encompasses a wide range of approaches. However, the 26 studies enhance the theoretical and practical potential of RM…

Hellison, Don; Walsh, David

2002-01-01

220

Investigation of arcjet nozzle performance  

NASA Technical Reports Server (NTRS)

An investigation is performed to examine the feasibility of improving arcjet performance through the use of contoured nozzle designs. The results of preliminary experiments performed on two different nozzle configurations, a 19 degree half-angle cone and a 'bell' shaped nozzle, are described. A unique experimental arcjet apparatus, which effectively tests only the change in nozzle contour on arcjet performance is used in this investigation. The preliminary experimental results indicate approximately an 8 percent improvement in thrust and specific impulse for operation at 15 kW with an ammonia flow rate of 0.20 g/s for a 'bell' shaped nozzle compared to a conical nozzle.

Brophy, J. R.; Pivirotto, T. J.; King, D. Q.

1985-01-01

221

Critical Viscosity of Xenon investigators  

NASA Technical Reports Server (NTRS)

Dr. Dr. Robert F. Berg (right), principal investigator and Dr. Micheal R. Moldover (left), co-investigator, for the Critical Viscosity of Xenon (CVX/CVX-2) experiment. They are with the National Institutes of Standards and Technology, Gaithersburg, MD. The Critical Viscosity of Xenon Experiment (CVX-2) on the STS-107 Research 1 mission in 2002 will measure the viscous behavior of xenon, a heavy inert gas used in flash lamps and ion rocket engines, at its critical point. Although it does not easily combine with other chemicals, its viscosity at the critical point can be used as a model for a range of chemicals.

2001-01-01

222

Dust instrument for Mars investigation  

NASA Astrophysics Data System (ADS)

Instrument for measure dust particles physical behavior (impulse, velocity, charge, dimension etc.) is it represented of three type of sensor. The goals of it are to investigate the dust cycle in situ of dust flux at the surface of Mars. The exploring of dust on Mars has a big interest because of it is presented as permanent continuum in atmosphere; matter is mixed in planet's scope and transported in different areas etc. The investigation of dust transport's mechanism can be realize whether high condition dusting or thin mist.

Dolnikov, G. G.

2013-12-01

223

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

224

Investigation of Supercritical (Feher) Cycle.  

National Technical Information Service (NTIS)

Preliminary Design of the XFCTAP 01-01 Combined Rotating Unit (CRU) is described in this report. The unit is intended for the investigation of Supercritical (Feher) cycle engine components. The CRU consists of a single stage axial reaction turbine, a sing...

1968-01-01

225

Hells Canyon Environmental Investigation, 1984  

Microsoft Academic Search

The results of an environmental investigation of the nonpower impacts on the Hells Canyon Complex resulting from water budget participation are presented. The water budget plan would increase flows in the Columbia and Snake Rivers between April 15 and June 15 to improve survival of migrating salmon and steelhead. The study was conducted using existing data and consultation with agencies

1984-01-01

226

An Investigation of Document Structures.  

ERIC Educational Resources Information Center

Investigates the presence of clustering structure in a document collection and the influence of the presence of clustering structure on the success of cluster-based retrieval. Term-weight and similarity thresholds are discussed, empirical and statistical significance are considered, and indexing exhaustivity for document representation is…

Shaw, W. M., Jr.

1990-01-01

227

Summary of Nitrous Oxide Investigations.  

National Technical Information Service (NTIS)

The Air Force Weapons Laboratory (AFWL) proposes to use nitrous oxide (N2O) as an oxidizer in a combustion process for an airborne system. A number of problem areas were investigated by AFWL or by other organizations under contract to AFWL. This report su...

J. K. Cawthra M. Eisenstadt

1976-01-01

228

Kinetic investigation of wood pyrolysis  

Microsoft Academic Search

The kinetics of wood pyrolysis into gas, tar, and char was investigated in the range of 300 to 400 degrees Celcius at atmospheric pressure. An experimental system which facilitates the monitoring of the actual sample temperature, collection of gas and tar, and measurement of the sample weight loss as a function of time was developed. It has been found that,

Franz Thurner; Uzi Mann

1981-01-01

229

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

230

Energy Sources - Water Wheel Investigation  

NSDL National Science Digital Library

This lesson plan investigates the conversion of potential energy to kinetic energy in a water wheel. Additionally, students will learn about the production of electricity through hydropower as well as the scientific process. Questions are included for students to record their observations and use critical thinking.This document may be downloaded in PDF file format.

2012-10-11

231

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.

232

Renal bone disease: Radiological investigation  

Microsoft Academic Search

Renal bone disease: Radiological investigation. The bone disease associated with chronic renal impairment is complex and multifactorial, and has changed over past decades. Whereas originally features of vitamin D deficiency (rickets\\/osteomalacia) and secondary hyperparathroidism (erosions, osteosclerosis, brown cysts) predominated, improvement in management and therapy have resulted in such readiographic features being present in a minority of patients. Metastatic calcification and

Judith E. Adams

1999-01-01

233

Program of hadronic physics investigations  

Microsoft Academic Search

The discussion of a program of hadronic physics investigations includes some of the open questions which may be resolved through studies with the Doubler in its collision mode, and then with external beams. Low momentum-transfer conventional hadron physics is emphasized. Elastic and inelastic scattering, total and differential cross sections, inclusive processes, pomeron exchange and spin flip are covered. (JFP)

1976-01-01

234

Developing communication and investigative skills.  

PubMed

The need to develop effective communication and investigative skills is an essential part of the training of security officers. The following article contains recommendations for those responsible for such training, as set forth in the new IAHS Instructor's Training Manual. PMID:10272300

1985-01-01

235

SLIC-7 Laser Gyro Investigations.  

National Technical Information Service (NTIS)

This program is the initial phase of an effort to develop laser gyro technology for application to low cost inertial missile guidance systems. As part of the research and development effort, two investigations of SLIC-7 laser gyro were conducted: (1) ther...

J. Abdale W. Drexel

1978-01-01

236

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

237

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

238

IMPROVING WATERBORNE DISEASE OUTBREAK INVESTIGATIONS  

EPA Science Inventory

This article summarizes the discussions and conclusions of a workshop held December 7-8, 1998, to consider the inherent limitations and weaknesses of waterborne outbreak investigations and make recommendations for their improvement. In recent years, an increased number of suspec...

239

Investigations of bimorph adaptive mirrors  

Microsoft Academic Search

Cooled adaptive bimorph copper and molybdenum mirrors are suggested for large-scale optical aberration compensation in laser systems with power up to 15 kW. Characteristics of developed and produced cooled bimorph mirrors are investigated and comparison of experimental and calculative results are carried out. In the last part perspective adaptive bimorph mirror constructions are suggested and discussed.

Andrej V. Ikramov; I. M. Roshchupkin; Andrej G. Safronov

1993-01-01

240

Microstructural investigations on aerated concrete  

Microsoft Academic Search

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

N. Narayanan; K. Ramamurthy

2000-01-01

241

Investigating Pupils' Ideas of Learning.  

ERIC Educational Resources Information Center

A research project using an instrument designed to allow teachers to investigate their students' ideas about learning found that the ideas of 193 English and Finnish adolescents about learning were varied, without clear understanding of how they learned. Finnish students seemed to depend more on their teachers than did English students. (SLD)

Berry, John; Sahlberg, Pasi

1996-01-01

242

Yukon River Anadromous Fish Investigations.  

National Technical Information Service (NTIS)

The current Yukon River Anadromous Fish Investigations were initiated in 1972 to determine: (1) The size and effect of commercial and subsistence harvests on the various stocks of king and chum salmon; (2) develop estimates or indices of the magnitudes an...

L. L. Trasky

1974-01-01

243

The Early Years: Investigable Questions  

NSDL National Science Digital Library

Teachers may not need to teach children to ask questions, just develop that safe place where questions can be voiced, observe children to see the questions in their actions, and develop a culture that appreciates and records questions. An investigable que

Ashbrook, Peggy

2010-12-01

244

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.

245

Investigation on laser safety informatics  

Microsoft Academic Search

With the aid of the detection on the multimedia messaging service (MMS) of the laser accidents, novel insecurity factors in laser safety informatics are investigated. By using continuously improved laser self-organization safety system, new concepts of laser safety are developed. Various kinds of accidents can be avoided when comprehensive protective measures are taken.

Chongwen Guan; Shizhan Lei; Yingjian Wang

2009-01-01

246

Investigating the Electrolysis of Water  

NSDL National Science Digital Library

In this lab exercise, students will investigate the electrolysis of water, using an electrolyser and a fuel cell. Step by step directions are provided for this experiment, along with a graphical representation of the setup. This document may be downloaded in PDF file format.

2012-04-23

247

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

248

Density limit investigations on ASDEX  

Microsoft Academic Search

Density limit investigations on ASDEX have been performed under a variety of conditions: ohmically heated and neutral injection heated plasmas in H2, D2 and He have been studied in different divertor configurations, after various wall coating procedures, with gas puff and pellet fuelling, and in different confinement regimes with their characteristically different density profiles. A detailed description of the parametric

A. Stabler; K. McCormick; V. Mertens; E. R. Muller; J. Neuhauser; H. Niedermeyer; K.-H. Steuer; H. Zohm; F. Dollinger; A. Eberhagen; G. Fussmann; O. Gehre; J. Gernhardt; T. Hartinger; J. V. Hofmann; E. Kakoulidis; M. Kaufmann; G. Kyriakakis; R. S. Lang; H. D. Murmann; W. Poschenrieder; F. Ryter; W. Sandmann; U. Schneider; G. Siller; F. X. Soldner; N. Tsois; O. Vollmer; F. Wagner

1992-01-01

249

Forensic osteological investigations in Kosovo  

Microsoft Academic Search

A team of Finnish forensic experts performed investigations of alleged mass graves in Kosovo under the mandate of the European Union (EU). Human skeletal remains from two locations were examined. The remains contained three almost complete skeletons, and individual bones and bone fragments, part of which were burned. Injuries, pathological changes, and findings for identification purposes were examined and documented

Juha Rainio; Minttu Hedman; Kari Karkola; Kaisa Lalu; Petteri Peltola; Helena Ranta; Antti Sajantila; Niklas Söderholm; Antti Penttilä

2001-01-01

250

Investigations on Multiplication of Fractions.  

ERIC Educational Resources Information Center

Three different models with continuous materials, discontinuous materials, and number lines were used to study the operation concept in six investigations on multiplication with fractions with pupils aged 11-12 in a Penang International School. All approaches could be understood by pupils, but they preferred the area and fractional models. (MNS)

Sai, Khoo Phon; Inder, Walter R. D.

1984-01-01

251

INVESTIGATIONS WITH MERCURY FLOW REACTOR  

EPA Science Inventory

The objective of the research performed in the Mercury Flow Reactor is to investigate short residence-time (seconds) adsorption of mercury species using different sorbents. Emphasis is placed on the effects of mercury concentration, flow rates, reaction temperatures, exposure ti...

252

Investigating Concurrency in Weapons Programs.  

National Technical Information Service (NTIS)

Concurrency in a weapons program -- the actual production of the weapons system while some portions of the design are still being completed -- has been a topic of debate for decades. While there have been some investigations into certain programs that poi...

D. Birchler E. Groo G. Christle

2010-01-01

253

Self-Repair Theory Investigation.  

National Technical Information Service (NTIS)

The Self-Repair Theory Investigation is a study to develop a theory of self repair in digital nets via fault diagnosis and automatic circuit replacement. The technique used is that of the Sequential Prime Implicant Form. This report shows how the factorin...

E. W. Veitch

1967-01-01

254

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

255

Why Are Mathematical Investigations Important?  

ERIC Educational Resources Information Center

"Research studies show that when students discover mathematical ideas and invent mathematical procedures, they have a stronger conceptual understanding of connections between mathematical ideas." Flewelling and Higginson state that inquiry, investigations, and problem solving "give students the opportunity to use their imagination and to get into…

Quinnell, Lorna

2010-01-01

256

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.

257

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

258

T-Plant Cell Investigation.  

National Technical Information Service (NTIS)

The Waste Management Project within Fluor Hanford performed an initial investigation of the current and historical contents of 22 1-T(T Plant Canyon) process cells. This Phase I report is intended to be followed by a final, more detailed, Phase I1 report....

K. L. Hladek

2001-01-01

259

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

260

41 CFR 101-39.403 - Investigation.  

Code of Federal Regulations, 2010 CFR

...of the investigation, including (when available) photographs, measurements, doctor's certificate of bodily injuries, police investigation reports, operator's statement, agency's investigation reports, witnesses' statements,...

2009-01-01

261

41 CFR 101-39.403 - Investigation.  

Code of Federal Regulations, 2010 CFR

...of the investigation, including (when available) photographs, measurements, doctor's certificate of bodily injuries, police investigation reports, operator's statement, agency's investigation reports, witnesses' statements,...

2010-07-01

262

Neuropsychological investigation of amateur boxers.  

PubMed Central

Amateur boxing is faced with criticism over the potential damage the sport inflicts on those who participate. The most sensitive measure of early neurological dysfunction is neuropsychological investigation. Ten studies employing such assessments on 289 amateur boxers are reviewed. The forms of analysis undertaken include controlled comparison with other sportsmen, of both active and former boxers, detailed pre- and post-bout analysis, analysis of the influence of within-boxing variables, length of career, level of competition and prospective longitudinal investigation. Amateur boxers were found to exhibit no signs of neuropsychological dysfunction in any analysis. However some trends emerged suggesting a long career in amateur boxing might reduce fine motor reactions, although such findings are within the normal range and do not represent central neuropsychological functioning. Thus amateur boxing does not appear to expose individuals to neurological dysfunction.

Butler, R J

1994-01-01

263

Forensic osteological investigations in Kosovo.  

PubMed

A team of Finnish forensic experts performed investigations of alleged mass graves in Kosovo under the mandate of the European Union (EU). Human skeletal remains from two locations were examined. The remains contained three almost complete skeletons, and individual bones and bone fragments, part of which were burned. Injuries, pathological changes, and findings for identification purposes were examined and documented using standard methods of forensic pathology and osteology. Gunshot injuries were found in some cases, but reliable determination of the cause and manner of death was not possible. A discrepancy arose between the number of victims reported in information received from the presiding district court, and results of the investigations. The estimation of the minimum number of victims was mostly acquired by DNA analysis. PMID:11566420

Rainio, J; Hedman, M; Karkola, K; Lalu, K; Peltola, P; Ranta, H; Sajantila, A; Söderholm, N; Penttilä, A

2001-10-01

264

Mechanical Hole Burning Spectroscopic Investigation  

NASA Astrophysics Data System (ADS)

Mechanical spectral hole burning (MSHB) was previously applied to a densely entangled block copolymer and successfully distinguishes the heterogeneous from the homogeneous state. Here, we chose polystyrene (PS) solutions to further investigate the effect of entanglement density on mechanical spectral hole burning. The entanglement density was varied by changing either solution concentration or molecular weight of the PS. Dynamics in different regimes ranging from close to the Rouse regime into the terminal region were also examined.Our results are consistent with a heterogeneous dynamics over both entanglement (or plateau) and Rouse regimes. Terminal relaxation dynamics, on the other hand, were always found to be homogeneous for the PS/diethyl phthalate solutions investigated. In addition, no significant dependence of the hole burning event on entanglement density was observed.

Qin, Qian; McKenna, Gregory

2008-03-01

265

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!

266

INVESTIGATIONS ON CARTOGRAPHIC CONSTRAINT FORMALISATION  

Microsoft Academic Search

This paper presents investigations on the formalisation of cartographic requirements by constraint specifications. The work was carried out within the EuroSDR 1 project on studying the state-of-the-art of commercially available generalisation software. The aim of the study presented in this paper was to analyse and compare several constraint specifications from various National Mapping Agencies (ICC, Catalonia; IGN, France; OS, Great

Dirk Burghardt; Stefan Schmid; Jantien Stoter

267

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

268

Theoretical investigation of neutral francium  

Microsoft Academic Search

Energy levels of neutral francium are investigated in the Ritz formalism along the Rydberg series up to n = 30. Transition probabilities are calculated for the s-p and p-d transitions. Core-polarization effects are included in the model adopted. The validity of the approach has been tested by comparison with the laser lifetime measurements available for the 70953-4075\\/31\\/24\\/012\\/img7 and 70953-4075\\/31\\/24\\/012\\/img8 states

E. Biémont; P. Quinet; V. Van Renterghem

1998-01-01

269

Rosetta Radio Science Investigations (RSI)  

Microsoft Academic Search

The Rosetta spacecraft has been successfully launched on 2nd March 2004 to its new target comet 67 P\\/Churyumov-Gerasimenko.\\u000a The science objectives of the Rosetta Radio Science Investigations (RSI) experiment address fundamental aspects of cometary\\u000a physics such as the mass and bulk density of the nucleus, its gravity field, its interplanetary orbit perturbed by nongravitational\\u000a forces, its size and shape, its

Martin Pätzold; Bernd Häusler; Kaare Aksnes; John D. Anderson; Sami W. Asmar; Jean-Pierre Barriot; Michael K. Bird; Hermann Boehnhardt; Werner Eidel; Eberhardt Grün; Wing H. Ip; Essam Marouf; Trevor Morley; Fritz M. Neubauer; Hans Rickman; Nicolas Thomas; Bruce T. Tsurutani; Max K. Wallis; N. C. Wickramasinghe; Eirik Mysen; Oystein Olson; Stefan Remus; Silvia Tellmann; Thomas Andert; Ludmila Carone; Markus Fels; Christina Stanzel; Iris Audenrieth-Kersten; Alexander Gahr; Anna-Liane Müller; Dusan Stupar; Christina Walter

2007-01-01

270

Investigation on Pyrolysis of Casein  

Microsoft Academic Search

First casein was processed by pyrolysis and investigated under optimal thermal treatment condition to obtain a good quality\\u000a adsorbent with high developed porosity structure and liquid product as a complex raw material for different kind of organic\\u000a compounds with interesting properties and structures. The yields of hard residue, pitch, pyrolysis water and gases were determined\\u000a and compared with the yields

B. Purevsuren; Y. Davaajav

2001-01-01

271

Investigating Natural Selection: Elementary School  

NSDL National Science Digital Library

This lesson plan is designed for fourth and fifth grade students learning about natural selection. The class will investigate the predator-prey relationship as an example of how natural selection occurs in a population. Students will work in groups of three or four and observe how predators select their prey, and how this affects the subsequent populations of a species. The concept of camouflage is also covered in the material. This lesson is designed to take about sixty minutes of class time.

2010-01-01

272

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

273

Empirical Investigations of Student Understanding  

NSDL National Science Digital Library

Why study student understanding of physics? For some of us, "because it's there" is a large part of the reason. However, many of us are also strongly committed to using our findings to improve teaching at the classroom level. One type of investigation that has proven fruitful as a guide for improving student learning is discussed in the article. The underlying goals and assumptions are discussed in general terms. A specific example provides a context for discussing the interpretation of student thinking.

Heron, Paula R.

2005-11-02

274

Shuttle Fuel Feedliner Cracking Investigation  

NASA Technical Reports Server (NTRS)

This presentation provides an overview of material covered during 'Space Shuttle Fuel Feedliner Cracking Investigation MSFC Fluids Workshop' held November 19-21, 2002. Topics covered include: cracks on fuel feed lines of Orbiter space shuttles, fluid driven cracking analysis, liner structural modes, structural motion in a fluid, fluid borne drivers, three dimensional computational fluid dynamics models, fluid borne drivers from pumps, amplification mechanisms, flow parameter mapping, and flight engine flow map.

Nesman, Tomas E.; Turner, Jim (Technical Monitor)

2002-01-01

275

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

276

Modeling of a Spring\\/Damper System for Electrical Contacts using Dynamic Designer in Autodesk Mechanical Desktop  

Microsoft Academic Search

Extreme space limitations and the desire to reduce the bounce between contacts prompted an investigation of the use of Belleville washers and Sorbothane as part of a spring\\/damper system in a medium voltage high-speed shorting device. Experimental tests in conjunction with mechanism simulation have been used to optimize a spring and damping system for the minimization of bounce that occurs

Mary B. Groff

277

Investigating a computerized scaffolding software for student designed science investigations  

NASA Astrophysics Data System (ADS)

Science standards call for students to develop skills in designing their own investigations. However, this is a complex task that is likely to overload the working memory capacities of students, therefore requiring scaffolding. This study investigated the effects of a computerized scaffold for student-designed experiments. Students (N = 102) used the computer program to individually design an experiment during the third week of their high school general chemistry course. Students were randomly assigned to one of four software versions to determine the effects and interaction effects of backwards-design scaffolding and reflective prompts on laboratory report scores. Scaffolding the students in a backwards-design process lead to significantly higher student performance scores for all students when they were not provided with reflective prompts (p = 0.01). For students labeled as academically advanced by their eighth grade science teacher, backwards design increased student performance scores with or without reflective prompts (p = 0.002). Using reflective prompts had no effect on advanced students. The use of multiple reflective prompts caused the effect of the backwards-design scaffolding to disappear with lower-level students.

Deters, Kelly M.

278

ENVIRONMENTAL INVESTIGATIONS BRANCH STANDARD OPERATING PROCEDURES, 2001  

EPA Science Inventory

The Environmental Investigations Standard Operating Procedures details standard field protocol in areas of Hazardous Waste Investigations under CERCLA and RCRA, Clean Water Act Inspections, Clean Air Act investigations, and Criminal Investigations. The manual originated in 1980 ...

279

Kinetic investigation of wood pyrolysis  

SciTech Connect

The objective of this investigation was to determine the kinetics of the primary reactions of wood pyrolysis. A new experimental method was developed which enabled us to measure the rate of gas, tar, and char production while taking into account the temperature variations during the wood heating up. The experimental method developed did not require any sophisticated instruments. It facilitated the collection of gas, tar and residue (unreacted wood and char) as well as accurate measurement of the temperature inside the wood sample. Expressions relating the kinetic parameters to the measured variables were derived. The pyrolysis kinetics was investigated in the range of 300 to 400/sup 0/C at atmospheric pressure and under nitrogen atmosphere. Reaction temperature and mass fractions of gas, tar, and residue were measured as a function of time. Assuming first-order reactions, the kinetic parameters were determined using differential method. The measured activation energies of wood pyrolysis to gas, tar, and char were 88.6, 112.7, and 106.5 kJ/mole, respectively. These kinetic data were then used to predict the yield of the various pyrolysis products. It was found that the best prediction was obtained when an integral-mean temperature obtained from the temperature-time curve was used as reaction temperature. The pyrolysis products were analyzed to investigate the influence of the pyrolysis conditions on the composition. The gas consisted mainly of carbon dioxide, carbon monoxide, oxygen, and C/sub 3//sup +/-compounds. The gas composition depended on reaction time as well as reactor temperature. The tar analysis indicated that the tar consisted of about seven compounds. Its major compound was believed to be levoglucosan. Elemental analysis for the char showed that the carbon content increased with increasing temperature.

Thurner, F.; Mann, U.; Beck, S. R.

1980-06-01

280

Investigation of musicality in birdsong.  

PubMed

Songbirds spend much of their time learning, producing, and listening to complex vocal sequences we call songs. Songs are learned via cultural transmission, and singing, usually by males, has a strong impact on the behavioral state of the listeners, often promoting affiliation, pair bonding, or aggression. What is it in the acoustic structure of birdsong that makes it such a potent stimulus? We suggest that birdsong potency might be driven by principles similar to those that make music so effective in inducing emotional responses in humans: a combination of rhythms and pitches-and the transitions between acoustic states-affecting emotions through creating expectations, anticipations, tension, tension release, or surprise. Here we propose a framework for investigating how birdsong, like human music, employs the above "musical" features to affect the emotions of avian listeners. First we analyze songs of thrush nightingales (Luscinia luscinia) by examining their trajectories in terms of transitions in rhythm and pitch. These transitions show gradual escalations and graceful modifications, which are comparable to some aspects of human musicality. We then explore the feasibility of stripping such putative musical features from the songs and testing how this might affect patterns of auditory responses, focusing on fMRI data in songbirds that demonstrate the feasibility of such approaches. Finally, we explore ideas for investigating whether musical features of birdsong activate avian brains and affect avian behavior in manners comparable to music's effects on humans. In conclusion, we suggest that birdsong research would benefit from current advances in music theory by attempting to identify structures that are designed to elicit listeners' emotions and then testing for such effects experimentally. Birdsong research that takes into account the striking complexity of song structure in light of its more immediate function - to affect behavioral state in listeners - could provide a useful animal model for studying basic principles of music neuroscience in a system that is very accessible for investigation, and where developmental auditory and social experience can be tightly controlled. PMID:24036130

Rothenberg, David; Roeske, Tina C; Voss, Henning U; Naguib, Marc; Tchernichovski, Ofer

2014-02-01

281

Dynamics explorer interdisciplinary scientist investigations  

NASA Technical Reports Server (NTRS)

This document is a final report on research activities and accomplishments that occurred during the funding period of 10-1-90 through 1-30-94. The focus of our interdisciplinary investigation during the Dynamics Explorer Mission was on the complex coupling processes that tap the magnetic-storm energy, stored in the ring current particle reservoir, and transport this energy into the subauroral, midlatitude and even equatorial ionospheric regions. The transport of energy through the inner magnetosphere and into the underlying ionospheric regions is a critical element in our understanding of the impact of solar and magnetic disturbances on upper atmospheric and ionospheric regions equatorward of the auroral zone.

Kozyra, Janet U.; Nagy, A. F.

1994-01-01

282

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

283

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

284

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

285

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

286

Kinetic investigation of wood pyrolysis  

SciTech Connect

The kinetics of wood pyrolysis into gas, tar, and char was investigated in the range of 300 to 400 degrees Celcius at atmospheric pressure. An experimental system which facilitates the monitoring of the actual sample temperature, collection of gas and tar, and measurement of the sample weight loss as a function of time was developed. It has been found that, in the range investigated, wood decomposition into gas, tar, and char can be described by three parallel first-order reactions as suggested by Shafizadeh and Chin (1977). The activation energies for these reactions are 88.6, 112.7 and 106.5 kJ/mol, respectively, and their frequency factors defined on a mass basis are 8.61 x 10 to the power of 5, 2.47 x 10 to the power of 8, and 4.43 x 10 to the power of 7 min-1. The composition of the pyrolysis products was also analyzed. It was found that the gas consists mainly of carbon dioxide, carbon monoxide, oxygen, and C3 + compounds with trace amounts of methane, ethylene, and acetylene. The tar consists of seven compounds with levoglucosan accounting for more than half. The char was analyzed by elemental analysis and it was found that its carbon content increases with increasing reactor temperature. (Refs. 12).

Thurner, F.; Mann, U.

1981-07-01

287

Numerical investigation of stall flutter  

SciTech Connect

Unsteady, separated, high Reynolds number flow over an airfoil undergoing oscillatory motion is investigated numerically. The compressible form of the Reynolds-averaged governing equations is solved using a high-order, upwind biased numerical scheme. The turbulent flow region is computed using a one-equation turbulence model. The computed results show that the key to the accurate prediction of the unsteady loads at stall flutter conditions is the modeling of the transitional flow region at the leading edge. A simplified criterion for the transition onset is used. The transitional flow region is computed with a modified form of the turbulence model. The computed solution, where the transitional flow region is included, shows that the small laminar/transitional separation bubble forming during the pitch-up motion has a decisive effect on the near-wall flow and the development of the unsteady loads. Detailed comparisons of computed fully turbulent and transitional flow solutions with experimental data are presented.

Ekaterinaris, J.A. [NASA Ames Research Center, Moffett Field, CA (United States). Navy-NASA Joint Inst. of Aeronautics; Platzer, M.F. [Naval Postgraduate School, Monterey, CA (United States). Dept. of Aeronautics and Astronautics

1996-04-01

288

Investigating the Climate System: Precipitation  

NSDL National Science Digital Library

In this module students will discover how rainfall rates are measured, how the intensity and distribution is determined, and what methods are used to study and predict precipitation events. They will analyze data and interpret information in order to make predictions and utilize satellite data to determine the intensity and distribution of rainfall to improve the safety of air travel. Students will also analyze and research global rainfall patterns, apply various scientific methods in order to collect and interpret precipitation measurements and predict precipitation events, examine long-range weather predictions and compare them to archival satellite data, and study scientific data to determine how rainfall intensity and temperatures change vertically as well as horizontally. They will also investigate the effectiveness of using the traditional scientific method in meteorological research, use their knowledge of TRMM (Tropical Rainfall Measuring Mission) satellite data to propose new instruments and satellite missions, and present their ideas to the class.

Cerullo, Mary

289

Delaminations Investigated With Ultrasonic Spectroscopy  

NASA Technical Reports Server (NTRS)

A previous study suggested that the ultrasonic spectroscopy technique identified possible disbonds or delaminations in polymer matrix composite (PMC) rings sectioned from flywheel rotors (ref. 1). These results went unsubstantiated by other nondestructive evaluation (NDE) methods. To explain the results, PMC rings were further investigated with ultrasonic spectroscopy (ref. 2). The ultrasonic spectroscopy system utilizes a continuous-swept sine waveform as the input. After the swept sine wave traverses the material, the captured waveform is subjected to two fast Fourier transforms. The second fast Fourier transform along with equalization of the frequency spectrum, allows for evaluation of the fundamental resonant frequency. The full-thickness resonance, the resonance corresponding to the location of the intentional disbond, and the frequency spectrum were examined in an effort to characterize the sensitivity of the NDE method to various delamination conditions.

Cosgriff, Laura M.

2003-01-01

290

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

291

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

292

Laboratory investigation of Acanthamoeba keratitis.  

PubMed Central

Following the diagnosis of Acanthamoeba keratitis in a contact lens wearer, the antimicrobial susceptibility of the clinical isolate and the environmental source of the infection were investigated. Contrary to previous reports, in vitro antimicrobial testing showed that the infecting strain was inherently resistant to propamidine isethionate. Restriction endonuclease digestion analysis of Acanthamoeba whole-cell DNA of strains isolated from the patient's cornea, contact lens storage container, saline rinsing solution, and kitchen cold-water tap showed that the isolates were identical. This implicates, for the first time, domestic tap water as the source of Acanthamoeba sp. in this infection. It is therefore recommended that the use of homemade saline solutions and the rinsing of contact lenses in tap water be strongly discouraged. Images

Kilvington, S; Larkin, D F; White, D G; Beeching, J R

1990-01-01

293

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

294

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

295

Wildlife health and disease investigations  

USGS Publications Warehouse

Wildlife population management requires knowledge of factors that affect population sustainability. Mortality is one of the most important of those factors. Without a clear understanding of the causes of mortality, decisions by managers of whether or how to intercede may be inappropriate. Wildlife biologists are usually the first to discover, assess, and respond to wildlife mortality. Biologists who make accurate, complete and timely field investigations, and proper collection and shipment of samples to a diagnostic facility are essential for an accurate diagnosis. In combination with wildlife disease specialists, biologists can identify causes of wildlife mortality, detect long-term patterns in factors that affect the survival of populations, and take appropriate corrective action to minimize the impact of some mortality factors on wildlife populations.

Roffe, T. J.; Work, T. M.

2005-01-01

296

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

297

Investigative modalities in infectious keratitis  

PubMed Central

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.

Gupta, Noopur

2008-01-01

298

Postirradiation investigations at Forschungszentrum Juelich  

SciTech Connect

Materials performance at high-power spallation neutron sources is a major consideration worldwide during this period of time when designs for several new facilities are being developed. Realizing the need for materials radiation effects data from exposure to prototypical environments, studies at the Los Alamos Neutron Science Center (LANSCE), Los Alamos National Laboratory, and the spallation neutron source (SINQ) at the Paul Scherrer Institut (PSI), Villigen, Switzerland, have been initiated. A number of candidate materials are considered, and post-irradiation investigations should give definite answers to the engineers engaged in the design of the future accelerator-based facilities. Before the data from these irradiations become available, components irradiated in operating medium-power spallation facilities are at present the only source of direct information on the behavior of materials in a spallation environment. Within an international collaboration, the following components were shipped to the hot cells of the Forschungszentrum Juelich: (1) a hemispherical window operated at LANSCE made of Inconel 718; (2) a spherical water degrader made of Inconel 718 and Type 304L stainless steel used for the neutrino production in the target area of LANSCE; (3) two curved PSI windows made of DIN 1.4926 stainless steel and irradiated in LANSCE; and (4) a complete target from ISIS at Rutherford Appleton Laboratory in England consisting of Ta plates in a Type 304 stainless steel housing, used to produce neutrons for the experimental program from 1988 to 1996. Because of the urgent need to have mechanical properties information after proton irradiation of Inconel 718, the priority of the investigation was given to the outer shell of the water degrader. The water degrader was irradiated with 800-MeV protons to a maximum damage level in the center of the proton beam of {approximately}10 displacements per atom.

Carsughi, F. [Forschungszentrum Juelich (Germany). Inst. fuer Festkoerperforschung; Sommer, W. [Los Alamos National Lab., NM (United States)

1998-09-01

299

Investigation of Celestial Solid Analogs  

NASA Technical Reports Server (NTRS)

Our far infrared studies of both hydrophobic and hydrophilic aerogel grains have demonstrated that the mm and sub-mm wave absorption produced by the fundamental two level systems (TLS) mechanism represents a more significant contribution for these open grain structures than for bulk amorphous silicate grains. We found that the region with the anomalous temperature dependence of the spectral index due to the TLS excitations can extend in a fluffy material up to 80 per cm, which is well beyond its typical upper limit for bulk glasses. Currently there is no theoretical explanation for this surprising result. The effects of reduced dimensionality on the optical properties of carbonaceous grains have been studied with a systematic investigation of carbon aerogels. This spectroscopic approach has permitted a more reliable determination of the single grain mass normalized absorption coefficient based on the experimentally determined characteristics of the fluffy material rather than on first principles calculations involving the bulk properties of the substance. Our finding is that the electrical connectivity of the material is the main factor affecting its far infrared absorption coefficient. Another one of the main constituents of the interstellar dust, amorphous ice, has been investigated in the mm-wave region both in the high (HDA) and low (LDA) density amorphous phases and as a function of impurities. We found that doping either phase with ionic (LiCl) or molecular (methanol) impurities decreases the difference in the mm-wave absorption coefficient between the HDA and LDA ice phases so that the HDA spectrum can be used as an analog for impure ice absorption in the far infrared spectral region.

Sievers, A. J.

2003-01-01

300

Investigation and management of dysphagia.  

PubMed

Dysphagia is a common finding in infants and children with neuromuscular disabilities. Dysphagia may be developmental, as in the preterm infant, transient, chronic, or progressive. The evaluation of dysphagia must take into account the age of the patient and typical development of feeding and swallowing for that age. The typical abilities seen in neonatal, early infancy, later infancy and early childhood periods vary in sensorimotor skills and feeding efficiency. In addition to knowing the substrate of expected skills by age, knowledge of the neurophysiology of feeding and swallowing is essential to diagnosis. Each physiologic phase of deglutition: oral, pharyngeal, and esophageal can present with symptoms of dysphagia that can guide investigation. Common symptoms of dysphagia include generalized feeding difficulty such as poor efficiency, food refusal and failure to thrive. Specific symptoms include tongue thrust, choking, cough, and oxygen desaturation. The possibility of dysphagia can be identified through a thorough feeding history. Examination initially includes the infant's muscle tone and posture in the head, neck and body. Anomalies of structures of the head and neck must be identified and examined for their effect on function. Next, examination of oral structures for reflexes, tongue movements, and symmetry will identify neurologic abnormalities. Observation of feeding is essential and will reveal signs of dysphagia. Aspiration in the infant can present without specific signs. Respiratory abnormalities or Gastroesophageal reflux can be identified during history or examination. Investigation of dysphagia most commonly includes videofluoroscopy, endoscopy, and ultrasonography. The management of dysphagia requires an individualized approach and will include neurologic, respiratory, nutritional and possibly gastrointestinal management. Six broad areas are identified that must be considered in the management of dysphagia in infants and children. They include: normalization of posture and positioning, adaptation of foods and feeding equipment, oromotor therapy, feeding therapy, nutritional support and management of associated disorders. A team of professionals will assist the parent and child in achieving pleasant feedings to foster appropriate growth and development. PMID:14992457

Dusick, Anna

2003-12-01

301

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.

302

What Makes a Successful Congressional Investigation?  

ERIC Educational Resources Information Center

Relates the story of the evolution of Congressional abilities to conduct investigations of governmental figures and agencies. Uses a series of famous investigations including Teapot Dome, the Pecora Wall Street Investigation, Senator Harry Truman's war-profiteering investigations, Senator Joseph McCarthy's anticommunist investigations, and…

Ritchie, Donald A.

1998-01-01

303

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

304

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

305

The Galileo plasma wave investigation  

NASA Technical Reports Server (NTRS)

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 to 160 kHz for magnetic fields. Low time-resolution survey spectrums are provided by three on-board spectrum analyzers. In the normal mode of operation the frequency resolution is about 10 percent, and the time resolution for a complete set of electric and magnetic field measurements is 37.33 s. High time-resolution spectrums are provided by a wideband receiver. The wideband receiver provides waveform measurements over bandwidths of 1, 10, and 80 kHz. Compared to previous measurements at Jupiter this instrument has several new capabilities. These new capabilities include (1) both electric and magnetic field measurements to distinguish electrostatic and electromagnetic waves, (2) direction finding measurements to determine source locations, and (3) increased bandwidth for the wideband measurements.

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

1992-01-01

306

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

307

Investigation into nitrided spur gears  

SciTech Connect

The cold forging method has been widely used in industry to produce machine parts. In general, gears are produced by shaping or hobbing. One of the shaping techniques is precision forging, which has several advantages over hobbing. In the present study, cold forging of spur gears from Ti-6Al-4V material is introduced. To improve the surface properties of the resulting gears, plasma nitriding was carried out. Nuclear reaction analysis was carried out to obtain the nitrogen concentration, while the micro-PIXE technique was used to determine the elemental distribution in the matrix after forging and nitriding processes. Scanning electron microscopy and x-ray powder diffraction were used to investigate the metallurgical changes and formation of nitride components in the surface region. Microhardness and friction tests were carried out to measure the hardness depth profile and friction coefficient at the surface. Finally, scoring failure tests were conducted to determine the rotational speed at which the gears failed. Three distinct regions were obtained in the nitride region, and at the initial stages of the scoring tests, failure in surface roughness was observed in the vicinity of the tip of the gear tooth. This occurred at a particular rotational speed and work input.

Yilbas, B.S.; Coban, A.; Nickel, J.; Sunar, M.; Sami, M.; Abdul Aleem, B.J. [King Fahd Univ. of Petroleum and Minerals, Dhahran (Saudi Arabia)

1996-12-01

308

Investigation of an RF ICP  

NASA Astrophysics Data System (ADS)

In the present study, an experiment with an electrode less inductively coupled plasma (ICP) is under investigation. The main section of the experimental setup is a discharge tube of glass wrapped with a cylindrical induction coil. The RF power is coupled into the plasma by transformer action. Driven at a fixed frequency of 13.56MHz the generator used in this experiment can deliver up to 10kW of RF power. For diagnostic purposes Ar and He is used as a working gas. A main interest of this experiment is the influence of the coil geometry on the coupling efficiency between the external circuitry and the plasma. Therefore, measurements of the electrical parameters are performed to determine the coupling efficiency and monitor the capacitive-to-inductive transition, which occurs at higher power levels. The electron temperature of the discharge plasma is measured by spectroscopic means where else the electron density is determined using a langmuir probe. Comparing these results with the electrical measurements will enable us to achieve further insights into the relation between plasma parameters and the electrical characteristics of the driving circuitry.

Wiechula, J.; Iberler, M.; Jacoby, J.; Teske, C.

2007-10-01

309

Neurophysiological investigations in multiple sclerosis.  

PubMed

The advent of magnetic resonance imaging techniques has greatly reduced the diagnostic value of neurophysiological tests, particularly evoked potentials, in multiple sclerosis patients, because of the higher sensitivity in revealing subclinical involvement of the central nervous system. Technical progress and new methods of investigating afferent and efferent nervous pathways would seem to increase the sensitivity in detecting neural dysfunction, but the 'clinical gain' is modest at best. More promising is the utilization of neurophysiological tests to quantify the severity of white matter involvement. Transversal and longitudinal studies have demonstrated good correlations between neurophysiological parameters and disability measures, indicating that a battery of neurophysiological tests could be useful in monitoring the disease evolution in single patients and as surrogate endpoints in clinical trials. Further studies are needed for a better definition of the applications of evoked potentials and other neurophysiological techniques. Finally, event-related potentials and advanced electroencephalogram techniques, such as coherence analysis, could provide useful information on the pathophysiology of cognitive dysfunction, so common in multiple sclerosis patients, and with a strong impact on the quality of life. PMID:10871248

Leocani, L; Comi, G

2000-06-01

310

The Rosetta Lander (``Philae'') Investigations  

NASA Astrophysics Data System (ADS)

The paper describes the Rosetta Lander named Philae and introduces its complement of scientific instruments. Philae was launched aboard the European Space Agency Rosetta spacecraft on 02 March 2004 and is expected to land and operate on the nucleus of 67P/Churyumov-Gerasimenko at a distance of about 3 AU from the Sun. Its overall mass is ~98 kg (plus the support systems remaining on the Orbiter), including its scientific payload of ~27 kg. It will operate autonomously, using the Rosetta Orbiter as a communication relay to Earth. The scientific goals of its experiments focus on elemental, isotopic, molecular and mineralogical composition of the cometary material, the characterization of physical properties of the surface and subsurface material, the large-scale structure and the magnetic and plasma environment of the nucleus. In particular, surface and sub-surface samples will be acquired and sequentially analyzed by a suite of instruments. Measurements will be performed primarily during descent and along the first five days following touch-down. Philae is designed to also operate on a long time-scale, to monitor the evolution of the nucleus properties. Philae is a very integrated project at system, science and management levels, provided by an international consortium. The Philae experiments have the potential of providing unique scientific outcomes, complementing by in situ ground truth the Rosetta Orbiter investigations.

Bibring, J.-P.; Rosenbauer, H.; Boehnhardt, H.; Ulamec, S.; Biele, J.; Espinasse, S.; Feuerbacher, B.; Gaudon, P.; Hemmerich, P.; Kletzkine, P.; Moura, D.; Mugnuolo, R.; Nietner, G.; Pätz, B.; Roll, R.; Scheuerle, H.; Szegö, K.; Wittmann, K.

2007-02-01

311

Exobiological Investigations on Russian Spacecrafts  

NASA Astrophysics Data System (ADS)

To investigate the possibility of prebiotic synthesis of organic molecules in open space, conditions involved irradiating nucleosides and inorganic phosphate during five Earth-orbiting Russian space missions that included Salut-7 (13- and 16-month missions), Mir, Bion-11, and Cosmos-2044. Dry films of samples were exposed from 2 weeks up to 16 months to the entire set of factors encountered in open space during Earth-orbiting missions. After each mission, products synthesized during flight and any compounds that remained undegraded were analyzed. The analyses demonstrated that increased flight duration led to the decay of both synthesized nucleotides and initial nucleosides. Corresponding laboratory experiments indicated that infrared radiation caused the greatest amount of decay to products of prebiotic reactions. Experiments revealed that 5'-mononucleotides were the main chemical products of the major derivatives synthesized of certain nucleosides. Exposure to ultraviolet (UV) C145 was more effective than UVC254 in producing a comparatively higher yield of mononucleotides, while the energy flux of the latter was one order of magnitude less (10-7 as compared with 10-6 for UVC145). In the course of the laboratory simulation experiments the heating of solid samples yielded the greatest production amount (6.34% for adenosine derivatives).

Kuzicheva, Evgenia A.; Gontareva, Natalia B.

2003-06-01

312

Tribological investigation of oriented HDPE.  

PubMed

The possibility to control the wear properties of high-density polyethylene (HDPE) material at an early processing stage is explored. Wear measurements of cold roll-drawn HDPE with two different draw ratios were carried out for three sliding planes, each in two directions. The dependence of the wear properties on the degree and direction of orientation was investigated. The experiments were performed in a pin-on-disc machine in a dry environment. The tribo-couple consisted of HDPE plates versus a standardised diamond coated steel disc. The results show that the wear resistance of cold roll-drawn HDPE differ widely, by a factor up to 6, depending on the sliding direction relative to the drawing direction. The material has a significantly better wear resistance when the sliding direction was perpendicular to the processing direction. The best wear resistance was in the end plane and it was improved by a factor up to 3.6 when the draw ratio was increased from 2 to 4. These results indicate that molecular orientation by polymer processing is a promising method to improve the wear properties and decrease the wear debris production of HDPE. PMID:12115454

Hoseini, Mohammed; Lausmaa, Jukka; Boldizar, Antal

2002-09-15

313

Nevada nuclear waste storage investigations  

NASA Astrophysics Data System (ADS)

The Nevada Nuclear Waste Storage Investigations (NWSI) improvement of the technology of nuclear waste storage and disposal and determination whether selected underground rock media on or adjoining the Nevada Test Site are technically acceptable for a licensed, permanent, high level nuclear waste repository is examined. The NNWSI project work breakdown structure is comprised of eight tasks: systems, waste package, site, repository, regulatory and institutional, test facilities, land acquisition, and program management. Some of the highlights are: initial screening studies of candidate waste package alloys in tuff groundwater were completed; installation of the constant air monitoring system and the remote area monitoring system was completed; a transport model to describe the potential behavior of radionuclides in tuff was developed; a diaphragm diffusion cell was constructed for directly measuring the diffusion properties of tuff; the mineralogy and petrology of the 6000 foot section of the first major exploratory stratigraphic hole at Yucca Mountain; a series of numerical experiments were reported to employ nuclear explosions and earthquake data in a simultaneous inversion for crustal velocities and station delays to improve the accuracy of earthquake location; a three dimensional material model was developed for predicting jointed rock-mass response.

1981-08-01

314

Experimental investigations of elastohydrodynamic lubrication  

NASA Technical Reports Server (NTRS)

Various experimental studies of elastohydrodynamic lubrication have been reviewed. The various types of machines used in these investigations, such as the disc, two and four ball, crossed-cylinders, and crossed-axes rolling disc machine, are described. The measurement of the most important parameters, such as film shape, film thickness, pressure, temperature, and traction, is considered. Determination of the film thickness is generally the most important of these effects since it dictates the extent to which the asperities on opposing surfaces can come into contact and thus has a direct bearing on wear and fatigue failure of the contacting surfaces. Several different techniques for measuring film thickness have been described, including electrical resistance, capacitance, X-ray, optical interferometry, laser beam diffraction, strain gage, and spring dynamometer methods. An attempt has been made to describe the basic concepts and limitations of each of these techniques. These various methods have been used by individual researchers, but there is no universally acceptable technique for measuring elastohydrodynamic film thickness. Capacitance methods have provided most of the reliable data for nominal line or rectangular conjunctions, but optical interferometry has proved to be the most effective procedure for elliptical contacts. Optical interferometry has the great advantage that it reveals not only the film thickness, but also details of the film shape over the complete area of the conjunction.

Hamrock, B. J.; Dowson, D.

1983-01-01

315

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

316

Recent Investigations on AA Doradus  

NASA Astrophysics Data System (ADS)

AA Dor is an eclipsing, post common-envelope binary with an sdOB-type primary and an unseen low-mass secondary, believed to be a brown dwarf. Eleven years ago, a NLTE spectral analysis of the primary showed a discrepancy with the surface gravity that was derived by radial-velocity and light-curve analysis that could not be explained. Since then, emission lines of the secondary were identified in optical spectra and its orbital-velocity amplitude was measured. Thus, the masses of both components are known, however, within relatively large error ranges. The secondary's mass was found to be around the stellar hydrogen-burning mass limit and, thus, it may be a brown dwarf or a late M-type dwarf. In addition, a precise determination of the primary's rotational velocity showed recently, that it rotates at about 65% of bound rotation—much slower than previously assumed. A new spectral analysis by means of metal-line blanketed, state-of-the-art, non-LTE model atmospheres solves the so-called gravity problem in AA Dor—our result for the surface gravity is, within the error limits, in agreement with the value from light-curve analysis. We present details of our recent investigations on AA Dor.

Rauch, T.

2012-03-01

317

77 FR 60440 - Clinical Investigator Training Course  

Federal Register 2010, 2011, 2012, 2013

...following: Foster a cadre of clinical investigators with knowledge...commitment to investigational medicine; Promote communication between clinical investigators and FDA; ...FDA's role in experimental medicine; and Improve the...

2012-10-03

318

78 FR 63988 - Clinical Investigator Training Course  

Federal Register 2010, 2011, 2012, 2013

...following: Foster a cadre of clinical investigators with knowledge...commitment to investigational medicine; Promote communication between clinical investigators and FDA; ...FDA's role in experimental medicine; and Improve the...

2013-10-25

319

Field Investigation of Externally Insulated Sheeting Roofs.  

National Technical Information Service (NTIS)

This investigation of externally insulated sheeting roofs comprised field investigations in addition to the tests in the laboratory. The field investigation consisted of collection of insulation and sheeting data from roof laying in progress, and the proc...

B. Gullbrandson G. Johansson

1975-01-01

320

32 CFR 776.84 - Ethics investigation.  

Code of Federal Regulations, 2013 CFR

... 2013-07-01 2013-07-01 false Ethics investigation. 776.84 Section 776.84...Complaint Processing Procedures § 776.84 Ethics investigation. (a) Whenever an ethics investigation is initiated, the covered...

2013-07-01

321

42 CFR 93.310 - Institutional investigation.  

Code of Federal Regulations, 2012 CFR

...misconduct investigations must: (a) Time. Begin the investigation within 30...allegations within a reasonable amount of time after determining that an investigation...misconduct within a reasonable amount of time of deciding to pursue allegations...

2012-10-01

322

NCI-Frederick TMM - Investigator Usage  

Cancer.gov

Transgenic and Knock-Out Services - Investigator Usage Principal Investigators Who Used Transgenic Mouse Model September 26, 2003 – September 25, 2004 Principal Investigator Laboratory Number of Constructs Completed Dr. S. Abrams Tumor Immunology and

323

45 CFR 689.6 - Investigations.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 false Investigations. 689.6 Section...Continued) NATIONAL SCIENCE FOUNDATION RESEARCH MISCONDUCT § 689.6 Investigations. (a) When an...promptly initiated its own investigation, OIG may defer...

2010-10-01

324

45 CFR 689.6 - Investigations.  

Code of Federal Regulations, 2010 CFR

...2009-10-01 false Investigations. 689.6 Section...Continued) NATIONAL SCIENCE FOUNDATION RESEARCH MISCONDUCT § 689.6 Investigations. (a) When an...promptly initiated its own investigation, OIG may defer...

2009-10-01

325

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

326

30 CFR 50.11 - Investigation.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Investigation. 50.11 Section 50.11 Mineral...PRODUCTION IN MINES NOTIFICATION, INVESTIGATION, REPORTS AND RECORDS OF ACCIDENTS...PRODUCTION IN MINES Notification, Investigation, Preservation of Evidence §...

2010-07-01

327

76 FR 45168 - Rules Relating to Investigations  

Federal Register 2010, 2011, 2012, 2013

...RIN 3170-AA03 Rules Relating to Investigations AGENCY: Bureau of Consumer Financial...is adopting its Rules Relating to Investigations in order to describe the Bureau's procedures for investigations pursuant to section 1052 of...

2011-07-28

328

77 FR 39101 - Rules Relating to Investigations  

Federal Register 2010, 2011, 2012, 2013

...RIN 3170-AA03 Rules Relating to Investigations AGENCY: Bureau of Consumer Financial...final rule for the Rules Relating to Investigations, the Bureau of Consumer Financial...making revisions to its procedures for investigations under section 1052 of the...

2012-06-29

329

77 FR 44174 - Procedures for Safety Investigations  

Federal Register 2010, 2011, 2012, 2013

...CFR Part 1708 Procedures for Safety Investigations AGENCY: Defense Nuclear Facilities...conducting preliminary and formal safety investigations of events or practices at DOE defense...experience in conducting formal safety investigations necessitates codifying the...

2012-07-27

330

Investigation of a wrongful death.  

PubMed

This reprint of a 1979 article tells the story of Rosie Jiminez, a 27-year-old Mexican-American woman who died in McAllen General Hospital in Texas on October 3, 1977, from the complications of an illegal abortion. Jiminez was the first reported victim of the Hyde Amendment which cut off federal Medicaid funding for abortion. She was a daughter of migrant workers, a single mother of a 5-year-old daughter, a welfare recipient, a part-time worker, and a university student 6 months from receiving a bachelor's degree in education. When she died, she had a $700 scholarship check in her pocket, but if she had used that money to pay for an abortion, her education would have been curtailed. Initial reports to the US Centers for Disease Control (CDC), the agency charged with monitoring the effects of the Hyde Amendment, indicated that Jiminez had obtained her abortion in Mexico to protect her privacy. Four months of independent investigation uncovered two women who had accompanied Jiminez to a lay midwife who performed the abortion in Texas. The local police did nothing with this information, and only arrested the midwife when abortion activists set up a trap in which she was recorded offering to perform an abortion for $125. The abortionist was sentenced to 3 days in jail and fined $100 but was not charged in Jiminez's death. The CDC included this information in a two-paragraph report but failed to take any other action to determine the scale of morbidity and mortality following the Hyde Amendment. The women of America must refuse to tolerate the death of a single woman because of a lack of funding for abortion. PMID:12178869

Kissling, F; Frankfort, E

1996-01-01

331

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

2003-01-01

332

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

333

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

334

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.

335

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

336

The Wind Magnetic Field Investigation  

NASA Astrophysics Data System (ADS)

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 associated electronics. The dual configuration provides redundancy and also permits accurate removal of the dipolar portion of the spacecraft magnetic field. The instrument provides (1) near real-time data at nominally one vector per 92 s as key parameter data for broad dissemination, (2) rapid data at 10.9 vectors s-1 for standard analysis, and (3) occasionally, snapshot (SS) memory data and Fast Fourier Transform data (FFT), both based on 44 vectors s-1. These measurements will be precise (0.025%), accurate, ultra-sensitive (0.008 nT/step quantization), and where the sensor noise level is <0.006 nT r.m.s. for 0 10 Hz. The digital processing unit utilizes a 12-bit microprocessor controlled analogue-to-digital converter. The instrument features a very wide dynamic range of measurement capability, from ±4 nT up to ±65 536 nT per axis in eight discrete ranges. (The upper range permits complete testing in the Earth's field.) In the FTT mode power spectral density elements are transmitted to the ground as fast as once every 23 s (high rate), and 2.7 min of SS memory time series data, triggered automatically by pre-set command, requires typically about 5.1 hours for transmission. Standard data products are expected to be the following vector field averages: 0.0227-s (detail data from SS), 0.092 s (‘detail’ in standard mode), 3 s, 1 min, and 1 hour, in both GSE and GSM coordinates, as well as the FFT spectral elements. As has been our team's tradition, high instrument reliability is obtained by the use of fully redundant systems and extremely conservative designs. We plan studies of the solar wind: (1) as a collisionless plasma laboratory, at all time scales, macro, meso and micro, but concentrating on the kinetic scale, the highest time resolution of the instrument (=0.022 s), (2) as a consequence of solar energy and mass output, (3) as an external source of plasma that can couple mass, momentum, and energy to the Earth's magnetosphere, and (4) as it is modified as a consequence of its imbedded field interacting with the moon. Since the GEOTAIL Inboard Magnetometer (GIM), which is similar to the MFI instrument, was developed by members of our team, we provide a brief discussion of GIM related science objectives, along with MFI related science goals.

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

1995-02-01

337

Introducing The Process of Investigative Science  

NSDL National Science Digital Library

Students are introduced to the process of investigative science through a guided inquiry activity. Given a testable question and materials, students as a class make predictions, and design an investigation with guidance from the teacher. Then in pairs, students do the investigation, collect data, draw conclusions, and discuss ways to improve on the investigative design. After this activity, students will be able to develop independent investigations in this and other subject areas

Akiyama, Linda

2012-03-22

338

Multidisciplinary Highway Collision Investigation Training Course.  

National Technical Information Service (NTIS)

Two (2) two week courses were conducted by Dynamic Science, Inc. at Phoenix, Arizona to train accident investigators and allied specialists. The course entitled 'Multidisciplinary Highway Collision Investigation Training' (MDHCIT) was developed by Dynamic...

J. D. Baird A. Heffernan

1980-01-01

339

Important Notice Investigator Financial Disclosure Policy  

NSF Publications Database

... of the investigator's spouse and dependent children) (i) that would reasonably appear to be directly ... and the investigator's spouse and dependent children. c. An institutional policy must ensure that ...

340

Investigation and Measurement of Traffic Dynamics.  

National Technical Information Service (NTIS)

Contents: (1) Investigation of a safety criterion for the use of electronic devices as traffic aids; (2) Traffic flow studies: development of vehicle detector equipment, results of investigation of speed-volume-density relationship, results of headway cha...

1965-01-01

341

29 CFR 24.104 - Investigation.  

Code of Federal Regulations, 2013 CFR

...STATUTES AND SECTION 211 OF THE ENERGY REORGANIZATION ACT OF 1974...Solid Waste Disposal Act; Clean Air Act; and Comprehensive...f) Investigation under the Energy Reorganization Act. In addition...to investigations under the Energy Reorganization Act....

2013-07-01

342

Investigating Processes of Sedimentation in Gravel Pits  

NSDL National Science Digital Library

This is a field investigation where students will explore and observe sediments within a local gravel pit and from their observation create an investigation that will help to determine the nature of the sediments.

Olson, Melissa

343

Investigation Of Far-Field Diffraction  

NASA Technical Reports Server (NTRS)

Report describes experimental investigation of far-field diffracton by normally illuminated circular apertures with diameters of several wavelengths of incident light. Purpose of investigation to determine whether Keller's "geometrical" theory of diffraction valid for diffraction phenomena of this kind.

Wang, Yaujen; Scholl, Marija S.

1993-01-01

344

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

345

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

346

Characterising the Cognitive Processes in Mathematical Investigation  

ERIC Educational Resources Information Center

Many educators believe that mathematical investigation involves both problem posing and problem solving, but some teachers have taught their students to investigate during problem solving. The confusion about the relationship between investigation and problem solving may affect how teachers teach their students and how researchers conduct their…

Yeo, Joseph B. W.; Yeap, Ban Har

2010-01-01

347

A Classroom Investigation into the Catenary  

ERIC Educational Resources Information Center

The quest to find the equation of a catenary makes an ideal investigation for upper secondary students. In the modelling exercise that follows, no knowledge of calculus is required to gain a fairly good understanding of the nature of the curve. This investigation is best described as a scientific investigation--a "hands on" experience that…

Staples, Ed

2011-01-01

348

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

349

Nevada Nuclear Waste Storage Investigations. Geologic and Hydrologic Investigation of Yucca Mountain: Peer Review Documentation.  

National Technical Information Service (NTIS)

This document is a compilation of review comments on the geologic and hydrologic investigation of Yucca Mountain. This investigation is being managed by the Nevada Nuclear Waste Storage Investigations (NNWSI). The principal NNWSI participant organizations...

1981-01-01

350

Value of information analysis in remedial investigations.  

PubMed

Site investigations of contaminated land are associated with high costs. From a societal perspective, just enough economic resources should be spent on investigations so that society's limited resources can be used optimally. The solution is to design investigation programs that are cost effective, which can be performed using value of information analysis (VOIA). The principle of VOIA is to compare the benefit at the present state of knowledge with the benefit that is expected after an investigation has been performed. A framework for VOIA of site investigations is presented based on Bayesian risk-cost-benefit decision analysis. The result is an estimate of the value of an investigation program and, for specific problems, the optimal number of samples. The main strength of the methodology is that it promotes clear thinking and compels the decision maker to reflect on issues that otherwise would be ignored. The main weakness is the complexity of VOIA models. PMID:17985703

Back, Pär-Erik; Rosén, Lars; Norberg, Tommy

2007-09-01

351

Flexible manufacturing system (FMS): The investigative phase  

SciTech Connect

An investigation has been conducted into the feasibility of using flexible manufacturing system (FMS) technology to machine and inspect a family of stainless steel and aluminum parts for electrical components. The investigation was conducted by a user-oriented team of KCD personnel with the help of an outside consultant. The investigation showed that FMS was appropriate and justifiable for the KCD application. A project was initiated to purchase and implement an FMS system. 1 ref.

Setter, D.L.

1992-02-01

352

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

353

Working Scientifically Using the Investigation Planning Board.  

ERIC Educational Resources Information Center

Presents ideas for teaching elementary school children about scientific inquiry methods. Recommends a Planning Board to scaffold students' thinking as they plan and conduct scientific investigations. (WRM)

Alexander, Louise

2000-01-01

354

Geotechnical investigations of the PEP site  

Microsoft Academic Search

The purpose of this paper is to summarize the general nature of the geology and rock and soil formations of the PEP site as they relate to the design and construction of the project; to describe site investigation programs and to catalog the geotechnical information presently available about the site. The recently-completed investigation of subterranean conditions around the PEP ring

1976-01-01

355

Investigation and Modeling of Cranberry Weather Stress  

Microsoft Academic Search

Cranberry bog weather conditions and weather-related stress were investigated for development of crop yield prediction models and models to predict daily weather conditions in the bog. Field investigations and data gathering were completed at the Rutgers University Blueberry\\/Cranberry Research Center experimental bogs in Chatsworth, New Jersey. Study indicated that although cranberries generally exhibit little or no stomatal response to changing

Paul Joseph Croft

1991-01-01

356

Teaching Adult Students Mathematical Investigations-6.  

ERIC Educational Resources Information Center

Teaching Adult Students Mathematical Investigation is based on the continuing research work carried out for the last ten years of teaching on the Foundation Course in Mathematics at Goldsmiths, University of London. Teaching Mathematical Investigation to adult students is a very challenging and often rewarding experience for adult educators as…

Angiama, R. O.

357

The lessons of the Challenger investigations  

Microsoft Academic Search

It is pointed out that, both in methodology and in findings, the investigations of the Challenger disaster by a Presidential Commission and by a Congressional committee demonstrate that even in highly technical matters meaning is socially constructed. The author examines the evidence and testimony before the investigating bodies and finds that, before the launch, NASA officials construed information about O-ring

Paul M. Dombrowski

1991-01-01

358

Occupational Investigation. Teacher's Handbook. First Edition.  

ERIC Educational Resources Information Center

This teacher's handbook provides suggestions for organization and presentation of resource and instructional materials found in four occupational investigation guides available separately (see Note). Chapter 1 explains Texas Education Agency operations and the Occupational Investigation program and policies. Chapter 2 discusses public relations…

East Texas State Univ., Commerce. Occupational Curriculum Lab.

359

Columbia Accident Investigation Board. Volume One.  

National Technical Information Service (NTIS)

The Columbia Accident Investigation Board's independent investigation into the February 1, 2003, loss of the Space Shuttle Columbia and its seven-member crew lasted nearly seven months. A staff of more than 120, along with some 400 NASA engineers, support...

D. W. Deal G. S. Hubbard H. W. Gehmann J. L. Barry J. M. Logsdon J. N. Hallock K. W. Hess R. E. Tetrault S. A. Turcotte S. B. Wallace S. E. Widnall S. K. Ride

2003-01-01

360

Investigation of Distortion Removal in Welded Structures.  

National Technical Information Service (NTIS)

The objective of the study is to investigate mechanisms of flame straightening with emphasis on its effectiveness on high-strength-steel structures. In the Phase 1 study an investigation was made of mechanisms of flame straightening on simple weldments in...

D. K. Duffy K. Masubuchi R. A. Walsh

1970-01-01

361

Earth Control and Investigations: Training Course 1974.  

ERIC Educational Resources Information Center

This document contains the outlines of each of 34 lectures given in the Earth Control and Investigations course sponsored by the Denver Laboratories. Topics covered include construction control of earth dams, canals, and filters; field and laboratory test procedures; soil classification and logging; and field investigations. (DT)

Department of the Interior, Denver, CO. Engineering and Research Center.

362

Planned BepiColombo Radio Science Investigations  

Microsoft Academic Search

The BepiColombo mission to Mercury has defined the investigations of the planetary interiors as well as tests of the theory of general relativity among its science objectives. Both of these objectives can be achieved using the tools and instrumentation of Radio Science. The investigations will provide detailed mapping of Mercury's gravity field, along with temporal variations due to tides, and

Sami Asmar; Luciano Iess; Veronique Dehant; Andrea Milani; Paolo Tortora

2008-01-01

363

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

364

Experimental investigation of premixed combustion under flashback  

NASA Astrophysics Data System (ADS)

The investigation of local and spatial flow field features in the lean premixed propane/air flame with flashback happening continuously has been made. LDV measurements were supplemented with pressure and flame position measurements, flow and flame front structure visualizations. Two flow duct configurations with different inlet/outlet conditions have been investigated.

Belokon, A. A.; Brainin, B. I.; Zhuk, V. A.; Maslov, V. P.; Mineev, B. I.; Secundov, A. N.

1993-11-01

365

SCADA systems: Challenges for forensic investigators  

Microsoft Academic Search

SCADA systems run 24\\/7 to control and monitor industrial and infrastructure processes. In case of potential security incidents, several challenges exist for conducting an effective forensic investigation. This paper discusses these challenges and investigates potential solutions. It shows the limitations of traditional IT-based approaches and also presents research challenges for initiating and continuing research in SCADA systems. Furthermore, it discusses

Irfan Ahmed; Sebastian Obermeier; Martin Naedele; Golden G. Richard

2012-01-01

366

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

367

Investigation of Propulsive Aspects of Mach Effects  

Microsoft Academic Search

Results of a continuing investigation of the propulsive potential of Mach effects—the fluctuation of the rest masses of objects that store internal energy as they are accelerated by external forces—obtained in the past year or so are reported. Two chief lines of investigation have been pursued: testing Mach-Lorentz thrusters (MLTs) and exploration of the “bulk acceleration” conjecture.

James F. Woodward

2009-01-01

368

Investigation of Propulsive Aspects of Mach Effects  

Microsoft Academic Search

Results of a continuing investigation of the propulsive potential of Mach effects-the fluctuation of the rest masses of objects that store internal energy as they are accelerated by external forces-obtained in the past year or so are reported. Two chief lines of investigation have been pursued: testing Mach-Lorentz thrusters (MLTs) and exploration of the ``bulk acceleration'' conjecture.

James F. Woodward; James F

2009-01-01

369

Cancer Cluster Investigation in a School District.  

ERIC Educational Resources Information Center

Investigated a possible cancer cluster among employees at one elementary school. Results of an industrial hygiene survey and health investigation found a marginally significant increase of risk for breast cancer among females who had worked for the school but no other excess in cancers. There were no significant employee exposures to carcinogens…

Neuberger, John S.; Pierce, J. Thomas; Lai, Sue Min

1997-01-01

370

Investigating Elementary Teachers' Conceptions of Animal Classification  

ERIC Educational Resources Information Center

Numerous studies have been conducted regarding alternative conceptions about animal diversity and classification, many of which have used a cross-age approach to investigate how students' conceptions change over time. None of these studies, however, have investigated teachers' conceptions of animal classification. This study was intended to…

Burgoon, Jacob N.; Duran, Emilio

2012-01-01

371

Schools and Teachers Supporting Student Open Investigations  

ERIC Educational Resources Information Center

This paper draws on a study of the BHP Billiton Science Awards to explore the ways in which open investigation work occurs in schools. The research used interviews with teachers and students and state organisers to develop a picture of what happens on the ground in running student open investigations, and to trace how schools have built a culture…

Symington, David; Tytler, Russell

2011-01-01

372

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.

373

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

374

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

375

SRP baseline hydrogeologic investigation: Aquifer characterization  

SciTech Connect

An investigation of the mineralogy and chemistry of the principal hydrogeologic units and the geochemistry of the water in the principal aquifers at Savannah River Site (SRS) was undertaken as part of the Baseline Hydrogeologic Investigation. This investigation was conducted to provide background data for future site studies and reports and to provide a site-wide interpretation of the geology and geochemistry of the Coastal Plain Hydrostratigraphic province. Ground water samples were analyzed for major cations and anions, minor and trace elements, gross alpha and beta, tritium, stable isotopes of hydrogen, oxygen, and carbon, and carbon-14. Sediments from the well borings were analyzed for mineralogy and major and minor elements.

Strom, R.N.; Kaback, D.S.

1992-03-31

376

Water-resources investigations, Collier County, Florida  

USGS Publications Warehouse

Early water-resources investigations in Collier County, Fla., were related to saltwater intrusion in Naples. With the advent of canal drainage and land reclamation farther inland, investigations were directed at effects of canals on water resources and the environment. High on the list of investigative needs are: (1) areal and vertical delineation of the shallow aquifer, the prime source of freshwater; (2) delineation of areas of poor quality ground water and the sources of the poor quality; (3) establishment of network of hydrologic data stations; and (4) determination of the relation between canals and the shallow aquifer. (USGS)

Klein, Howard

1980-01-01

377

Guide for Explosion and Bombing Scene Investigation.  

National Technical Information Service (NTIS)

The investigation conducted at the scene of an explosion or bombing plays a vital role in uncovering the truth about the incident. The evidence recovered can be critical in identifying, charging, and ultimately convicting suspected criminals. For this rea...

2000-01-01

378

Calorimetric Investigation of Deuterated Palladium Electrodes.  

National Technical Information Service (NTIS)

Calorimetric experiments were conducted to verify the caloric claims by Fleischmann and Pons. A twin-cell heat conduction calorimeter was used, rather than the quasiadiabatic instrumentation of the original investigation. Under similar electrochemical con...

C. W. Walker E. J. Plichta S. Gilman S. Slane T. R. Jow

1991-01-01

379

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

380

The Phoenix Surface Stereo Imager (SSI) Investigation  

NASA Astrophysics Data System (ADS)

The Surface Stereo Imager is the multi-spectral stereo camera for the Phoenix Mars Lander. It is designed to support Phoenix landed operations and to conduct geological, mineralogical, and atmospheric investigations.

Lemmon, M. T.; Smith, P. H.; Shinohara, C.; Tanner, R.; Woida, P.; Shaw, A.; Hughes, J.; Reynolds, R.; Woida, R.; Penegor, J.; Oquest, C.; Hviid, S. F.; Madsen, M. B.; Olsen, M.; Leer, K.; Drube, L.; Morris, R. V.; Britt, D. T.

2008-03-01

381

Investigating Cases of Child Abuse and Neglect.  

National Technical Information Service (NTIS)

Presents two dramatizations of investigations: one by a child protective service worker in cooperation with hospital staff, and the other by police on a situation of child abuse where small children were left unattended for the night. Primary audience: ge...

1994-01-01

382

A Preliminary Investigation into Lorry Tyre Noise.  

National Technical Information Service (NTIS)

Recent research has indicated the possibility that with reduced power unit noise, tire to road surface noise could become the predominant source of lorry noise. An investigation at the Transport and Road Research Laboratory has shown that, although tire n...

M. C. P. Underwood

1973-01-01

383

Investigations in the Field of Alkoxy Silanes.  

National Technical Information Service (NTIS)

Spirocyclic glycol esters of orthosilicic acid were obtained by catalytic disproportionation of the corresponding polyester, obtained by ester interchange of tetraethosysilane with glycols. Their proton magnetic resonance spectra were investigated and the...

R. M. G. Voronkov Y. P. Romadan V. A. Pestunovich I. B. Mazateika

1969-01-01

384

Investigative study of holographic recording materials development  

NASA Technical Reports Server (NTRS)

The potential of certain cis-trans isomers and doped LiNbO3 for the holographic read/write/erase memory application was investigated. The cis-trans work involved the photochemical investigation of a number of potential materials as well as specific molecular engineering efforts on alpha-methyl stilbene and its derivatives. These efforts resulted in an increase in the change in index of refraction, and thereby, in potential recording utility, of an order of magnitude. The work on LiNbO3 was directed toward a preliminary investigation of the dynamics of the writing process. Several samples and a variety of writing conditions were investigated. An unexpected and as yet unexplained improvement in material behavior with continued recycling was observed. In addition, some effort was devoted to an analysis of the physical conditions under which several current theories of the optical damage process are valid.

1972-01-01

385

45 CFR 689.6 - Investigations.  

Code of Federal Regulations, 2013 CFR

...Relating to Public Welfare (Continued) NATIONAL SCIENCE FOUNDATION RESEARCH MISCONDUCT § 689.6 Investigations...procedures or methods and inspection of laboratory materials, specimens, and records at awardee...

2013-10-01

386

Leptospirosis in Ceylon - Epidemiological and Laboratory Investigation.  

National Technical Information Service (NTIS)

Investigations are being carried out to establish the vectors for leptospira in Ceylon. For this purpose domestic and wild animals are trapped alive and, (1) their blood is examined for evidence of leptospiral antibodies, (2) their kidney tissue is cultur...

K. Nityananda

1969-01-01

387

Attention, Imagery and Memory: A Neuromagnetic Investigation.  

National Technical Information Service (NTIS)

The techniques of magnetic source imaging (MSI) have been applied to studies of three important aspects of human cognition: (1) An investigation of the effects of selective spatial attention on information processing within the human visual cortex for sti...

L. Kaufman S. J. Williamson

1991-01-01

388

INVESTIGATION OF THE ORION RESEARCH AMMONIA MONITOR  

EPA Science Inventory

The Orion Research ammonia monitor was investigated using the Orion specifications and environmental considerations as a guide. Laboratory tests under controlled environmental conditions showed the electronic stability (drift) to be well within + or - 10 percent of reading over t...

389

Terraballistic Projectiles Simplify Remote Preliminary Investigations.  

National Technical Information Service (NTIS)

A subsurface-sensing device which can be used for preliminary investigations of remote and inaccessible areas has been under development. The technique involves dropping or otherwise propelling a projectile which penetrates the ground. The projectile, whi...

R. L. McNeill B. E. Margason

1968-01-01

390

CPTAC Proteome Characterization Center Principal Investigators  

Cancer.gov

The following are the five Clinical Proteomic Tumor Analysis Consortium (CPTAC) teams, representing a network of seven Proteome Characterization Centers.  Teams are listed by grant title with their respective Principal Investigators: Cancer Proteomic

391

Financial Accounting for the Defense Investigative Service.  

National Technical Information Service (NTIS)

The Defense Finance and Accounting Service Denver Center provides accounting support for the Defense Investigative Service. The overall objectives of the audit were to assess internal controls and compliance with laws and regulations that require the prod...

1998-01-01

392

Investigation of Carbon Deposition in Chars. II  

National Technical Information Service (NTIS)

The techniques for the investigation of char densification phenomena which had been developed under a previous contract were extended to include transpiration experiments with gases and gas mixtures typical of the decomposition products of phenolic resins...

E. Weger J. R. Brew R. A. Servais

1968-01-01

393

Columbia Accident Investigation Board Report. Volume Six.  

National Technical Information Service (NTIS)

In the course of its inquiry into the February 1, 2003 destruction of the Space Shuttle Columbia, the Columbia Accident Investigation Board conducted a series of public hearings at Houston, Texas; Cape Canaveral, Florida; and Washington, DC. Testimony fro...

D. W. Deal G. S. Hubbard H. W. Gehmann J. L. Barry J. M. Logsdon J. N. Hallock K. W. Hess R. E. Tetrault S. A. Turcotte S. B. Wallace S. E. Widnall S. K. Ride

2003-01-01

394

Fur Seal Investigations, 2010-2011.  

National Technical Information Service (NTIS)

Researchers from the Alaska Fisheries Science Centers National Marine Mammal Laboratory conduct field investigations on the population status of northern fur seals (Callorhinus ursinus) on the Pribilof Islands, Bogoslof Island in the eastern Bering Sea, a...

J. W. Testa

2012-01-01

395

Fur Seal Investigations, 2006-2007.  

National Technical Information Service (NTIS)

Researchers from the Alaska Fisheries Science Centers National Marine Mammal Laboratory conduct field investigations on the population status of northern fur seals (Callorhinus ursinus) annually on the Pribilof Islands, Bogoslof Island in the eastern Beri...

J. W. Testa

2008-01-01

396

Investigation of the Mechansim of Fibrinolysis.  

National Technical Information Service (NTIS)

Investigations were made of the mechanism of fibrinolysis through evaluations of the role of enzymes and enzyme inhibitors. Specifically, studies were made utilizing the enzyme ribonuclease to inhibit the lysis of fibrin clots (bovine and human) by bovine...

J. B. Michaelson

1964-01-01

397

32 CFR 776.84 - Ethics investigation.  

Code of Federal Regulations, 2010 CFR

...hearing before the investigating officer (IO); (2) To inspect all evidence gathered...this section); (6) To challenge the IO for cause (such challenges must be made... (d) If a hearing is requested, the IO will conduct the hearing after...

2010-07-01

398

32 CFR 776.84 - Ethics investigation.  

Code of Federal Regulations, 2010 CFR

...hearing before the investigating officer (IO); (2) To inspect all evidence gathered...this section); (6) To challenge the IO for cause (such challenges must be made... (d) If a hearing is requested, the IO will conduct the hearing after...

2009-07-01

399

49 CFR 107.305 - Investigations.  

Code of Federal Regulations, 2013 CFR

...investigator may gather information by reasonable means including, but not limited to, interviews, statements, photocopying, photography, and video- and audio-recording. (4) With concurrence of the Director, Field Operations, Pipeline and...

2013-10-01

400

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

401

46 CFR 555.5 - Investigations.  

Code of Federal Regulations, 2013 CFR

...procedures set forth in the notice. Submissions filed in response to a notice of investigation may include written data and statistics, views, and legal arguments. Factual information submitted shall be certified under oath. An original and...

2013-10-01

402

Investigation of ACC/CCI Tunnel Diodes.  

National Technical Information Service (NTIS)

A tunnel-diode RF detector failed in DMSP system-level testing. An investigation was initiated by the prime contractor (Aerojet) with the assistance of The Aerospace Corporation. Destructive physical analyses carried out by Aerospace's Electronics Technol...

G. W. Stupian G. P. Chotkevys

1993-01-01

403

Computational Investigation of Subsonic Torsional Airfoil Flutter.  

National Technical Information Service (NTIS)

In this thesis single-degree-of-freedom torsional airfoil flutter is investigated using an incompressible potential flow code, a compressible inviscid Euler code and a compressible viscous Navier-Stokes code. It is found that the classical linearized inco...

C. Kakkavas

1998-01-01

404

Investigation of Near Shannon Limit Coding Schemes.  

National Technical Information Service (NTIS)

Turbo codes can deliver performance that is very close to the Shannon limit. This report investigates algorithms for convolutional turbo codes and block turbo codes. Both coding schemes can achieve performance near Shannon limit. The performance of the sc...

S. C. Kwatra J. Kim F. Mo

1999-01-01

405

Investigation of Fan Blade Shroud Mechanical Damping.  

National Technical Information Service (NTIS)

This program was conducted to investigate the effect of dry friction damping at the shroud interfaces on the structural dynamic characteristics of shrouded fan blades typical of current high performance jet engines. An analytical definition of the loads g...

D. A. Rimkunas H. M. Frye

1979-01-01

406

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

407

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

408

42 CFR 93.215 - Investigation.  

Code of Federal Regulations, 2013 CFR

... Investigation. 93.215 Section 93.215 Public Health PUBLIC HEALTH SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES HEALTH ASSESSMENTS AND HEALTH EFFECTS STUDIES OF HAZARDOUS SUBSTANCES RELEASES AND FACILITIES PUBLIC...

2013-10-01

409

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)

410

Investigating with magnets: attraction and repelling  

NSDL National Science Digital Library

This is a classroom activity where students create magnetic cats and see what occurs when the cats are placed next to each other. Students will be informally investigating magnetic attraction and repelling.

411

Investigation of Crystal Growth from Solutions.  

National Technical Information Service (NTIS)

Growth of organic compounds from solution, in particular Rochelle salt and triglycine sulphate, was investigated. Ground-based experiments showed that gravity-driven convection currents in the growth solution influenced defect production in crystals, degr...

I. Miyagawa

1975-01-01

412

Generating Quasigroups: A Group Theory Investigation  

ERIC Educational Resources Information Center

A procedure for generating quasigroups from groups is described, and the properties of these derived quasigroups are investigated. Some practical examples of the procedure and related results are presented.

Lynch, Mark A. M.

2011-01-01

413

Precontrol Investigation of Schistosomiasis in Central Sulawesi.  

National Technical Information Service (NTIS)

The known distribution of S. japonicum in Indonesia is limited to the Lindu and Napu Valleys, both of which are high, remote mountain valleys in Central Sulawesi. Current investigations have incriminated nine species of mammals, other than man, as reservo...

M. Sudomo, W. P. Carney

1974-01-01

414

Seepage Flows-Groundwater Pollution Investigations.  

National Technical Information Service (NTIS)

Soil structure, ground water flows, and pollutant dispersal from field and laboratory tests were investigated. Soil structure characteristics at the Adelphia Experimental Station were evaluated through measurements in situ and field data analysis in the l...

E. L. Bourodimos T. J. Harlukowicz

1975-01-01

415

Radi? receives Cryosphere Young Investigator Award: Citation  

NASA Astrophysics Data System (ADS)

Valentina Radi? received the 2011 Cryosphere Young Investigator Award at the 2011 AGU Fall Meeting, held 5-9 December in San Francisco, Calif. The award is for “a significant contribution to cryospheric science and technology.”

Hock, Regine; Clarke, Garry

2012-05-01

416

Radi? receives Cryosphere Young Investigator Award: Response  

NASA Astrophysics Data System (ADS)

Valentina Radi? received the 2011 Cryosphere Young Investigator Award at the 2011 AGU Fall Meeting, held 5-9 December in San Francisco, Calif. The award is for “a significant contribution to cryospheric science and technology.”

Radi?, Valentina

2012-05-01

417

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.

418

Investigative Learning in Undergraduate Freshman Biology Laboratories.  

ERIC Educational Resources Information Center

Describes the development and implementation of an investigative laboratory class. The new laboratory design has been determined to be a success by faculty, teaching assistants, and students. Includes a sample laboratory description. (DKM)

McKenzie, Woodrow L.; Glasson, George E.

1998-01-01

419

Investigation of Compressible Vortex Flow Characteristics.  

National Technical Information Service (NTIS)

The nature of intense air vortices was studied and the factors which determine the intensity and rate of decay of both single and pairs of vortices were investigated. Vortex parameters of axial pressure differential, circulation, outflow rates, separation...

V. U. Muirhead

1977-01-01

420

Experimental Investigation of Thermal Barriers. Final Report.  

National Technical Information Service (NTIS)

During this contract period, we completed the following small scale laboratory experiments: (a) plasma confinement by picket fence cusp magnetic fields. (b) Electrostatic plugging of picket fence cusps. (c) Investigations of sheath phenomena including: ch...

N. Hershkowitz

1984-01-01

421

Analytical and Numerical Investigation of Failure Waves.  

National Technical Information Service (NTIS)

Based on the proposed plane, an analytical and numerical investigation has been performed on the failure wave phenomenon. It appears that progressive percolation of microfissures into the material bulk governs the failure wave mechanisms. A three-dimensio...

Z. Chen

1999-01-01

422

Spectroscopic Investigations of Solid Rocket Propellant Combustion.  

National Technical Information Service (NTIS)

The composition of flames at different levels above the solid propellant surface was investigated by emission spectroscopy of specific molecules. Considerable changes of intensity were detected indicating that NH and CN molecules, as well as atomic carbon...

R. Mestwerdt

1977-01-01

423

A Procedure for Investigating Verbal Form  

ERIC Educational Resources Information Center

Reports the development of a Verbal Systems Analysis procedure for investigating significant form in verbal communications through a process which operationalizes two of the central concepts of form in Kenneth Burke's theory of symbolic action. (MH)

Ivie, Robert L.; Ayres, Joe

1978-01-01

424

18 CFR 808.12 - Investigative powers.  

Code of Federal Regulations, 2010 CFR

...808.12 Conservation of Power and Water Resources SUSQUEHANNA...808.12 Investigative powers. (a) The Commission...time and upon presentation of appropriate credentials...knowledge, information, and belief of the person...

2009-04-01

425

29 CFR 1984.104 - Investigation.  

Code of Federal Regulations, 2013 CFR

...COMPLAINTS UNDER SECTION 1558 OF THE AFFORDABLE CARE ACT Complaints, Investigations...in accordance with the Privacy Act of 1974, 5 U.S.C...the general provisions of the Affordable Care Act under which the complaint...

2013-07-01

426

Investigations of the Miyata Synthesis Technique.  

National Technical Information Service (NTIS)

These investigations generalize Miyata's synthesis of passive driving-point impedance functions by developing a step-by-step computational technique for augmenting a general driving-point impedance to insure that the real part of the augmented impedance i...

R. E. Carlson

1970-01-01

427

Investigation of a Leadership Development Program.  

National Technical Information Service (NTIS)

This study investigated whether individual leadership style and characteristics are affected by leadership training. A quantitative approach was taken, using Sashkin's Visionary Leadership Theory (VLT) to study the effects of a certificated military leade...

B. D. Lafferty

1998-01-01

428

Chemical Reactions: Investigating Exothermic and Endothermic Reactions  

NSDL National Science Digital Library

This activity is an inquiry-based investigation where students discover the indicators of chemical reactions (endothermic and exothermic) by collecting data and using that data to develop a testable question for further experimentation.

429

An Investigation of Rooftop Stolport Aerodynamics.  

National Technical Information Service (NTIS)

An investigation into aerodynamic problems associated with large building rooftop STOLports was performed. Initially, a qualitative flow visualization study indicated two essential problems: (1) the establishment of smooth, steady, attached flow over the ...

J. N. Blanton H. M. Parker

1972-01-01

430

Software Reliability Experiments Data Analysis and Investigation.  

National Technical Information Service (NTIS)

The objectives are to investigate the fundamental reasons which cause independently developed software programs to fail dependently, and to examine fault tolerant software structures which maximize reliability gain in the presence of such dependent failur...

J. L. Walker A. K. Caglayan

1991-01-01

431

Laser Hazards: Biomedical Threshold Level Investigations.  

National Technical Information Service (NTIS)

The review of current research data and areas requiring future investigation delineates project areas of prime interest. Through research, laser safety standards have been developed. Current studies are fulfilling the immediate requirements associated wit...

E. S. Beatrice H. Zwick D. I. Randolph B. E. Stuck D. J. Lund

1977-01-01

432

Investigation of 'Legionella pneumophila' in Drinking Water.  

National Technical Information Service (NTIS)

An investigation of Legionella pneumophila in drinking water systems and home plumbing appurtenances was done. In Phase 1, 68 water samples were collected from kitchen sink faucets in homes on 17 community water systems. No. L. pneumophila organisms were ...

L. E. Witherell R. W. Duncan K. M. Stone L. J. Stratton L. Orciari

1988-01-01

433

10 CFR 590.109 - FE investigations.  

Code of Federal Regulations, 2010 CFR

In conducting such investigations, the Assistant Secretary or the Assistant Secretary's delegate may, among other things, subpoena witnesses to testify, subpoena or otherwise require the submission of documents, and order testimony to be taken by...

2010-01-01

434

Investigation of Tanker Slop Tank Design.  

National Technical Information Service (NTIS)

This report presents the results of an investigation of slop tank designs as related to use aboard ship as gravity separators for oily water. Based on both laboratory tests and tanker experience, design considerations and guidelines on inlet configuration...

R. J. Fiocco V. X. Lanotte G. Raffaelli

1974-01-01

435

Experimental Investigation of Centrifugal Compressor Stabilization Techniques.  

National Technical Information Service (NTIS)

Results from a series of experiments to investigate techniques for extending the stable flow range of a centrifugal compressor are reported. The research was conducted in a high-speed centrifugal compressor at the NASA Glenn Research Center. The stabilizi...

G. J. Skoch

2003-01-01

436

Clinical Investigation Porgram, Annual Research Progress Report.  

National Technical Information Service (NTIS)

Subject report identifies these individuals who are conducting investigative protocols at Fitzsimons Army Medical Center. An abstract of each protocol giving abbreviated technical approach, objectives, and progress is presented. Publications and Presentat...

S. D. Bennion

1994-01-01

437

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

438

Investigation of electrical properties of carbon nanotubes  

Microsoft Academic Search

This paper presents the investigation of electrical properties of carbon nanotubes (CNT). A sandwich configuration, quartz substrate\\/Cr\\/Al\\/CNT (partially immersed in SiN)\\/Cr\\/Al was investigated. The CNT are mainly oriented parallel with the electrodes. Current - voltage characteristics were taken at 20 K and room temperature and a current - temperature characteristic was taken at constant voltage (20 mV). The I -

Magdalena Lidia Ciurea; Ionel Stavarache; Ana-Maria Lepadatu; Vladimir Iancu; M. Dragoman; G. Konstantinidis; R. Buiculescu

2009-01-01

439

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

440

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.

441

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.

442

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

443

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

444

Science Investigation That Best Supports Student Learning: Teachers' Understanding of Science Investigation  

ERIC Educational Resources Information Center

Internationally, learning science through investigation is promoted as a preferred pedagogical approach. Research presented takes a view that such learning depends on how teachers understand science investigation. Teachers' understanding of science investigation was an aspect of an interpretive case study of the phenomenon of science…

Moeed, Azra

2013-01-01

445

Trauma-informed forensic child maltreatment investigations.  

PubMed

Trauma-informed child welfare systems (CWSs) are the focus of several recent national and state initiatives. Since 2005 social work publications have focused on systemic and practice changes within CW which seek to identify and reduce trauma to children and families experiencing child maltreatment or other distressing events, as well as to the agency personnel working with these clients. Within the body of trauma-informed literature, little attention has been devoted specifically to the initial investigative response and its role in controlling for system induced trauma to the child, family, and caseworker. Training child protection services (CPS) workers on the impact of trauma in child maltreatment forensic investigations and the worker's role in anticipating and mitigating the effects of trauma during the investigative process is rarely addressed in the trauma-informed literature. This article reports on a training strategy to infuse trauma information into an existing forensic child maltreatment investigation curriculum with the goal of enhancing CPS caseworker's knowledge, skills, and values concerning the importance of viewing investigations and their associated tasks through a trauma lens. PMID:22533042

Pence, Donna M

2011-01-01

446

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

447

Investigations of physical model of biological tissue  

NASA Astrophysics Data System (ADS)

Physical model of a biological tissue for comparison with earlier created mathematical model of a biological tissue and researches of distribution photosensitizer in a depth was created and investigated. Mathematical model is based on granulated representation of optical medium. The model of a biological tissue was created on the basis of enough thin layers of a special material. For fluorescence excitation laser sources with a various wavelength were used. For investigation of scattering and fluorescent signal laser- fiber spectrum-analyzer LESA-5 was applied. Water solution of aluminum phthalocyanine and oil solution of zinc phthalocyanine were used for receiving of fluorescent signal. Created samples have certain absorbing and fluorescent properties. Scattering properties of samples are close to scattering properties of real human skin. By virtue of layered structure the model permits to simulate as a biological tissue without photosensitizer accumulation in it, as tissue with photosensitizer accumulation with certain distribution in a depth. Dependence of fields distribution on a surface was investigated at change of parameters of a model. Essential changes of distribution on a surface depending on the characteristics of model was revealed. The space and angular characteristics was investigated also. The investigations with physical model correspond to predicted results of theoretical model.

Linkov, Kirill G.; Kisselev, G. L.; Loschenov, Victor B.

1996-12-01

448

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

449

New Zealand SIR-B science investigations  

NASA Technical Reports Server (NTRS)

It is proposed that shuttle imaging radar (SIR) data be used to study unusual geological features of New Zealand. Particular attention is planned for geological faults. SIR-B imagery is to be compared with LANDSAT multispectral imagery. Three other investigations which are to use SIR data are discussed. An ocean eddy is to be studied from a correlation of SIR-B and advanced very high resolution radiometer imagery. Timber volume is to be assessed by determining the age and size of pine forests from SIR-B data. Soil moisture is to be investigated by comparing SIR-B data with simultaneous gravimetric data. Land cover in a region already subjected to intensive investigation using LANDSAT and aircraft scanner data is to be discriminated by SIR-B data.

Collins, M. A.; Oliver, P. J.; Cochrane, G. R.; Cole, J.; Coombs, D. S.; Barnes, E. J.; Ching, N. P.; Bennets, R. L.; Stephens, P. H.; Laing, A. K.

1984-01-01

450

Laboratory investigation of constitutive property scaling behavior  

SciTech Connect

Because many constitutive rock properties must be measured at one scale but applied at another, scaling behavior is an issue facing many applied disciplines, including the petroleum industry. A research program has been established to investigate and a quantify scaling behavior through systematic physical experimentation, with the aim of developing and testing models that describe scaling behavior in a quantitative manner. Scaling of constitutive rock properties is investigated through physical experimentation involving the collection of gas-permeability data measured over a range of discrete scales. The approach is to systematically isolate those factors that influence property scaling and investigate their relative contributions to overall scaling behavior. Two blocks of rock, each exhibiting differing heterogeneity structure. have recently been examined. The two samples were found to yield different scaling behavior, as exhibited by changes in the distribution functions and semi-variograms. Simple models have been fit to the measured scaling behavior that are of similar functional form but of different magnitude.

Tidwell, V.C.

1994-10-01

451

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.

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

452

Procedures for ground-water investigations  

SciTech Connect

This manual was developed by the Pacific Northwest Laboratory (PNL) to document the procedures used to carry out and control the technical aspects of ground-water investigations at the PNL. Ground-water investigations are carried out to fulfill the requirements for the US Department of Energy (DOE) to meet the requirements of DOE Orders. Investigations are also performed for various clients to meet the requirements of the Resource Conservation and Recovery Act of 1976 (RCRA) and the Comprehensive Environmental Response, Compensation and Liability Act of 1980 (CERCLA). National standards including procedures published by the American Society for Testing and Materials (ASTM) and the US Geological Survey were utilized in developing the procedures contained in this manual.

Not Available

1989-09-01

453

Investigation of deaths related to electrical injury.  

PubMed

Even though the use of electricity is an integral part of our lives, the number of accidents and deaths related to electricity is on the decline. This is due to increased awareness of electrical hazards and, in large part, to increased inclusion of safety mechanisms by manufacturers. However rare, electrical injury and related death can present a complicated case in the emergency department and for death investigators. Sometimes the circumstances of the physical scene are unclear because of intentional or accidental alterations or the investigator's inability to reconstruct events leading to the injury. This may hinder the initial clinical assessment. We present cases of typical and atypical deaths from electrical injury and review clinical and investigative procedures to assist in the treatment of patients with electrical injuries. PMID:8790308

VanDenburg, S; McCormick, G M; Young, D B

1996-09-01

454

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

455

(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

456

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

457

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

458

Numerical Investigation of Lattice Weinberg - Salam Model  

NASA Astrophysics Data System (ADS)

Lattice Weinberg - Salam model without fermions for the value of the Weinberg angle ?W ~ 30°, and bare fine structure constant around ? ˜ (1)/({150)} is investigated numerically. We consider the value of the scalar self coupling corresponding to bare Higgs mass around 150 GeV. We investigate phenomena existing in the vicinity of the phase transition between the physical Higgs phase and the unphysical symmetric phase of the lattice model. This is the region of the phase diagram, where the continuum physics is to be approached. We find the indications that at the energies above 1 TeV nonperturbative phenomena become important in the Weinberg - Salam model.

Zubkov, M. A.

2013-11-01

459

The psychiatrist and violent death investigation.  

PubMed

The role of the psychiatrist in supporting law enforcement investigation of violent deaths is discussed and illustrated with a case of the death of a woman and the injury of her husband. The question of whether this was a suicide or a homicide was posed by the investigating officers. The review of the background of the marriage and the information about the circumstances of the case is presented by the author so that one can have an insight into the value of the psychiatric evaluation of a case such as this. PMID:7091108

Danto, B L

1982-03-01

460

Death investigation after the destruction of evidence.  

PubMed

Unavailable in the literature is any reference to an investigation of death after evidence has been destroyed. In this presentation two firearms and the bullet were melted after the death was certified as a suicide. A team of investigators conducted a psychological autopsy as well as shot patterns to determine the distance from the gun muzzle to the head to determine whether or not the wound was a contact type. The resolution of the case is discussed and the factor of local politics and case prominence in the media is reviewed. PMID:8006630

Danto, B L; Streed, T

1994-05-01

461

Recommendations for research success: one investigator's perspective.  

PubMed

This article is a personal reflection by an investigator with over 25 years of funding from the National Institutes of Health (NIH). The article: (1) highlights research opportunities for psychologists at the NIH outside of the traditional mental health arena; (2) provides specific recommendations to individual investigators to enhance their likelihood of obtaining NIH funding; (3) specifies needed changes in psychology's research education and training programs to prepare the next generation of psychologists for research success; and (4) asks the Association of Psychologists in Academic Health Centers to play a lead role in both research training and advocacy. PMID:19104954

Johnson, Suzanne Bennett

2008-03-01

462

Results of the HESSI Test Mishap Investigation  

NASA Technical Reports Server (NTRS)

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

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

2000-01-01

463

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.

2014-01-01

464

Physics 620D: Electricity, Teacher Investigations  

NSDL National Science Digital Library

Stephen T. Thornton, a professor in the department of physics at the University of Virginia, has created this website to bring together a number of lesson plans for teachers in the field. Within this "Teacher Investigations" section of the site, visitors can look over three different classroom activities. The investigations include explorations into the world of light bulbs, the workings of circuits, and so on. Each activity includes a number of helpful diagrams, instructions, and questions for group discussion. Additionally, the site contains a list of recommended readings for physics teachers.

Thornton, Stephen T.

465

Experimental investigation of thermal barriers. Final report  

SciTech Connect

During this contract period, we completed the following small scale laboratory experiments: (a) plasma confinement by picket fence cusp magnetic fields. (b) Electrostatic plugging of picket fence cusps. (c) Investigations of sheath phenomena including: characteristics of probe sheaths, secondary electrons in a plasma-wall sheath, and end wall characteristics in TMX. (d) Suppression of secondary electron emission by permanent magnet produced multidipole magnetic field. (e) Electron thermal insulation by double layers and multiple double layers. Many of these investigations have already had important consequences in the development of improvement for neutral beam sources.

Hershkowitz, N.

1984-04-01

466

Dud Investigation of M69 Electric Detonator.  

National Technical Information Service (NTIS)

During an investigation on the 105Mm M456A1 HEAT Cartridge, it was found that the M509A1 Fuze containing the M48 Detonator was not Detonator Safe when initiated in the unarmed position. Since the M48 Detonator was found to be the primary source of the pro...

J. O. Juliano

1978-01-01

467

Investigations of Laser Mirrors with Different Design.  

National Technical Information Service (NTIS)

Laser mirror reflectivity and integral backscattering were investigated. Mirrors were industrially fabricated, or were developed at DFVLR and have ZnS/MgF2 or Ag/ZnS/MgF2 interference coatings. The experimental mirror-coating machine was modified to get r...

R. Gauert H. Rosteck

1985-01-01

468

Investigation of Chromium-Doped Oxides.  

National Technical Information Service (NTIS)

Part I of the report describes results obtained during the investigation of the mechanisms by which chromium-doping of a silicon-dioxide gate insulator may improve the radiation resistance of MOS devices. Part II details the fabrication and testing of a C...

R. A. Kjar

1973-01-01

469

Investigating Self Assessment Using Dual Scaling  

ERIC Educational Resources Information Center

This paper investigates self assessment using dual scaling which is a descriptive, optimal, non linear multidimensional and multivariate method that may be used to analyze nonlinear multivariate data "very effectively and exhaustively". Self assessment was defined as "the involvement of students in identifying standards and/or criteria to apply to…

McDonald, Betty

2011-01-01

470

School Roles: A Way to Investigate Participation  

ERIC Educational Resources Information Center

Students who are more engaged in school have higher academic achievement, lower dropout rates, and increased involvement in activities during early adulthood. Unfortunately, children with disabilities participate less than children without disabilities, thus increasing their risk for depression and anxiety. This study investigated the lack of…

Specht, Jacqueline A.; King, Gillian A.; Servais, Michelle; Kertoy, Marilyn; Spencer, Terry

2011-01-01

471

Investigating Algebraic Procedures Using Discussion and Writing  

ERIC Educational Resources Information Center

This study reports on the implementation of an intermediate algebra curriculum centered on a framework of student-centered questions designed to investigate algebraic procedures. Instructional activities were designed to build discourse in the small-group discussion meetings of the course. Students were assigned writing prompts to emphasize the…

Harper, Jonathan; Ford, Jeffrey

2012-01-01

472

6 CFR 13.4 - Investigation.  

Code of Federal Regulations, 2010 CFR

(1) The subpoena so issued will notify the Person to whom it is addressed of the Authority under which the subpoena is issued and will identify the records or Documents sought; (2) The Investigating Official may designate a Person to act on his or her behalf to receive the Documents sought;...

2009-01-01

473

A Time-Velocity Ration Investigation.  

ERIC Educational Resources Information Center

Piaget's investigations of children's conceptions of time included a conclusion that young children (ages 4-8) equate greater velocity with longer duration. This study showed that older children (ages 10-12) do not equate faster velocity with longer duration when musical examples are used. (Author/RM)

Bickel, Frank

1984-01-01

474

An Investigation of Alternative Cache Organizations  

Microsoft Academic Search

An investigation of the various cache schemes that are practical for a minicomputer has been found to provide considerable insight into cache organization. Simulations are used to obtain data on the performance and sensitivity of organizational parameters of various writeback and lookahead schemes. Hardware considerations in the construction of the actual cache-minicomputer are also noted and a simple cost\\/performance analysis

JAMES BELL; DAVID CASASENT; C. GORDON BELL

1974-01-01

475

Investigation of Geometric Radar Shapes for Stereotyping.  

National Technical Information Service (NTIS)

This investigation sought to determine whether any of the symbols which are currently being used or are proposed for usage in future air defense systems are stereotyped with the meanings hostile, friendly, and unknown. Each of the 100 male service members...

R. J. Carter

1981-01-01

476

29 CFR 1978.104 - Investigation.  

Code of Federal Regulations, 2013 CFR

...THE EMPLOYEE PROTECTION PROVISION OF THE SURFACE TRANSPORTATION ASSISTANCE ACT OF 1982...the respondent fails to make a timely response or fails to satisfy the burden set forth...given the opportunity to submit a written response, to meet with the investigators,...

2013-07-01

477

Spectrographic Investigation of Gold by Grimm Lamp.  

National Technical Information Service (NTIS)

The applicability of the Grimm-type low pressure electrical discharge, for the analysis of different gold alloys was investigated. A correction method was developed by Jager to compensate for the variation in sputtering rate due to changes in sample compo...

N. P. Ferreira I. L. Vanmaarseveen

1982-01-01

478

42 CFR 93.310 - Institutional investigation.  

Code of Federal Regulations, 2013 CFR

...addressed during the inquiry or in the initial notice...at the allegation or inquiry stages, take all...or evidence encompass scientific instruments shared...persons with appropriate scientific expertise who do not...those involved with the inquiry or investigation....

2013-10-01

479

Visual tools for assisting child pornography investigators  

Microsoft Academic Search

In this paper we investigate the use of visual tools for efficient video search. The different techniques have been implemented in a demo called iDash and several of the techniques are actively used by the Dutch police force in the fight against child pornography.

Pieter Eendebak; Wessel Kraaij; Stephan Raaijmakers; Elena Ranguelova; Ork de Rooij; Andrew Thean; Marcel Worring

480

Investigating Preservice Teachers' Literature Selection Process.  

ERIC Educational Resources Information Center

This paper examines the literature selection and evaluation practices of preservice teachers, investigating trends in choosing and acquiring literature and factors affecting the literature's appeal. Participants were undergraduate students enrolled in a language arts course for elementary school majors who completed a survey and attached it to a…

Michna, Katie Charisse Neves

481

Investigation of Factors Affecting Vertical Drain Behavior  

Microsoft Academic Search

Some influencing factors on vertical drain behavior were investigated by laboratory tests as well as by back-analyses of test embankments on vertical drain improved subsoil at Saga Airport, Saga, Japan. Based on the results from this study, suggestions are made on determining the design parameters for vertical drain improvement. For the discharge capacity test of a prefabricated vertical drain, confining

Jun-Chun Chai; Norihiko Miura

1999-01-01

482

THEORETICAL AND NUMERICAL INVESTIGATION ON FLAMELESS COMBUSTION  

Microsoft Academic Search

Flameless combustion has been acknowledged as one of the most interesting combustion technologies to meet both the targets of high process efficiency and low pollutant emissions. A theoretical and numerical investigation, carried out to provide a consistent physico-chemical explanation of this combustion regime, is reported here. CFD simulations of the flameless combustion WS-FLOX burner have been performed at ENEA to

D. TABACCO; C. INNARELLA; C. BRUNO

2002-01-01

483

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

484

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

485

Clinical Investigation Program Report FY90.  

National Technical Information Service (NTIS)

This report of the clinical investigation program at Fort Gordon, Georgia for FY1989 includes a history of medicine, dentistry dating from the 25th century B.C. to the 20th century A.D. Studies by the following departments are listed: Veterinary medicine,...

1990-01-01

486

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

487

Epidemiology and Investigation of Melioidosis, Southern Arizona  

PubMed Central

Burkholderia pseudomallei is a bacterium endemic to Southeast Asia and northern Australia, but it has not been found to occur endemically in the United States. We report an ostensibly autochthonous case of melioidosis in the United States. Despite an extensive investigation, the source of exposure was not identified.

Engelthaler, David M.; Blaney, David D.; Tuanyok, Apichai; Wangsness, Eric; Smith, Theresa L.; Pearson, Talima; Komatsu, Kenneth K.; Keim, Paul; Currie, Bart J.; Levy, Craig; Sunenshine, Rebecca

2011-01-01

488

Quantum dots investigated with charge detection techniques  

Microsoft Academic Search

The detection of the quantum dot charge state using a quantum point contact charge detector has opened a new exciting route for the investigation of quantum dot devices in recent years. In particular, time-resolved charge detection allowed the precise measurement of quantum dot shot noise at sub-femtoampere current levels, and the full counting statistics of the current. The technique can

Thomas Ihn; Simon Gustavsson; Urszula Gasser; Bruno Küng; Thomas Müller; Roland Schleser; Martin Sigrist; Ivan Shorubalko; Renaud Leturcq; Klaus Ensslin

2009-01-01

489

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

490

Computer Mediation of Collaborative Science Investigations.  

ERIC Educational Resources Information Center

Describes a prototype for the use of local area network (LAN) technology in a sixth grade earth science curriculum. Classroom activities that focus on cooperative small group learning are discussed, coordinated investigations as a framework for scientific activities in the classroom are explained, and possible future work with LAN environments is…

Newman, Denis; And Others

1989-01-01

491

Investigation of Membrane-Encapsulated Trypanocides.  

National Technical Information Service (NTIS)

A general method of loading 111 In 3+ to liposomes by a mobile ionophore, 8-hydroxyquinoline, has been developed to encapsulate a high specific radio-activity of 111 In 3+ in liposomes for investigating the fate of liposomes in tissues. Liposomes prepared...

K. J. Hwang

1979-01-01

492

Experimental apparatus for thermal shock fatigue investigations  

Microsoft Academic Search

An experimental rig developed for investigating crack growth in pressure vessels and piping equipment is described. The rig allows full scale modeling of cyclic thermal shock conditions that occur in operating thermal power station pressure equipment. It has the ability to apply a primary steady state mechanical load and to control the quenching environment allowing the study of the effect

B. B Kerezsi; A. G Kotousov; J. W. H Price

2000-01-01

493

THE MYSTERY OF TORRALBA--THREE INVESTIGATIONS.  

ERIC Educational Resources Information Center

ARCHEOLOGICAL DATA AND INTERPRETATIONS FROM THREE INVESTIGATIONS ARE USED TO PRESENT STUDENTS WITH THE TASK OF ANALYZING A SITE AT TORRALBA, LOCATED APPROXIMATELY 100 MILES NORTHEAST OF MADRID, SPAIN. SITE DRAWINGS, PHOTOGRAPHS, AND ACRYLIC MODELS OF ARTIFACTS ARE USED. STUDENTS DO NOT ENGAGE IN THE ACTUAL FIELD WORK BY WHICH DATA ARE ACCUMULATED.…

BERNSTEIN, EDGAR

494

Investigation of giant resonances via photon decay  

SciTech Connect

We describe some investigations into properties of giant resonances using elastic scattering of fast heavy-ion beams and the coincident detection of the gamma decay of the excited nucleus, using the TAPS array at GANIL. The particular experiments described are the identification of multiphoton giant resonance states and the measurement of projectile excitation, using the KVI forward wall detector.

Varner, R.L.; Beene, J.R.; Bertrand, F.E. [Oak Ridge National Lab., TN (United States)] [and others

1993-11-01

495

Performance investigation on new refrigerant mixture  

Microsoft Academic Search

this research presents a theoretical investigation on the performance of a vapour compression refrigerating system using different mixtures of Hydrocarbons and Hydrofluorocarbons refrigerants as a refrigerant. Genetic Algorithm method was used to solve a nonlinear constrained optimization problem for the selection of the best blend. The performance of new mixtures of Hydrocarbons and Hydrofluorocarbons refrigerants is compared with the performance

E. Khorshid; B. Alshriaan; A. Alsairafi; A. Alazemi; A. Alhaddad

2011-01-01

496

ARM Madden-Julian Oscillation Investigation Experiment  

ScienceCinema

Results of the ARM Madden-Julian Oscillation (MJO) Investigation Experiment (AMIE) field campaign are contributing significantly to concurrent national and international research efforts addressing questions about how the MJO initiates and changes as it passes phenomenon differs in observations versus models.

Long, Chuck

2014-06-13

497

Investigation of backfire monofilar helical antenna  

Microsoft Academic Search

This paper presents a numerical investigation of the electromagnetic properties of the backfire monofilar helical antenna. The current distribution along the helical conductor, the input impedance, and the front-to-back ratio are calculated and analyzed for the backfire operation of the antenna. A para- metric study of the helical geometry and the resulting antenna characteristics will be described and discussed. The

Thomas Gunst Smith; Niels Vesterdal Larsen; Ulrich Vesterager Gothelf; Oleksiy S. Kimy; Olav Breinbjergy

2011-01-01

498

Clinical investigation of gut immune responses  

Microsoft Academic Search

Mucosal and systemic immune systems are quite separate in their properties and in the factors which regulate them. In man, assessment of immune status at gut level, including the capacity to respond to oral vaccines, should follow the general lines which are used in research and clinical investigation of systemic immunity. All of the currently available methods for direct studies

Anne Ferguson; Jamal Sallam; Seamus O'Mahony; Ian Poxton

1995-01-01

499

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

500

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.