... I Capacitive Behavior in Conducting Polymers: AC Impedance and Quartz Crystal Microbalance Studies by ... AC Impedance Analysis - ...

... presaturated with the corrosion products. An AC impedance technique for the total electrical conductivity, the potentiostatic polarization method for ...

The ac conductivity and dielectric properties of glassy system SexTe79 - xGe21, with x = 11, 14, 17 at.%, has been studied at temperatures 300 to 450 K and over a wide range of frequencies (50 Hz to 500 kHz). Experimental results indicate that the ac conductivity and the dielectric constants ...

The relationship is derived, within the scope of irreversible thermodynamics, to predict the dc conductivity of a disperse system of the "conductor-in-conductor" type. The results enable one to describe the dc conductivity of the system with the help of the preliminary known expression for the ac conductivity as a ...

Crystalline defects, their transport and interactions with impurities in potassium and rubidium azides have been studied by measuring the electrical conductivity with ac and dc techniques, the diffusion by a tracer sectioning technique and by the measurem...

A study was conducted on the survival of asphalt concrete (AC) overlays on the Illinois Interstate highway system. Data were obtained from the Illinois Pavement Feedback Database (IPFS) for 410 AC overlay construction sections placed on continuously reinf...

Hermetically sealed, wound, AC, polycarbonate capacitors incorporating design improvements recommended in a previous study were designed and built. A 5000 hour, 400 Hz ac life test was conducted using 384 of these capacitors to verify the adequacy of the ...

This paper summarizes the results of a study conducted by the US Department of Energy, Office of Energy Storage and Distribution, to determine generic cost differences between dc and ac systems, and to identify situations where dc is clearly advantageous ...

AIR CONDUCTED OCULAR VEMP: II. FIRST CLINICAL INVESTIGATIONSBACKGROUND: Vestibular-evoked myogenic potentials (VEMP) are widely used to assess vestibular function. Air conducted (AC) cervical VEMP (cVEMP) reflect sacculus and inferior vestibular nerve function. Ocular VEMP (oVEMP) however has been hardly examined up to now. In recent ...

We report the study of electrical properties of some silver ion conducting molybdophosphate and borophosphate mixed network former glasses in a wide frequency and temperature range. The dc conductivity of the mixed network former glasses is higher than that of the single network former glasses. The ac ...

not be neglected. 1.2. Electrical conductivity measurement methodology The method of electrical conductivity study of electronic conduction. The method of electrical conductivity measurement con- ventionally used to probe the mechanism of conduction. ...

A comprehensive study has been undertaken to investigate the ability of AC-impedance spectroscopy (AC-IS) to non-destructively monitor the fiber dispersion of conductive fiber-reinforced cement-based materials. Previous work showed that AC-IS effectively monitors various fiber dispersion issues ...

... Accession Number : AD0606014. Title : THE LANGEVIN EQUATION AND THE AC CONDUCTIVITY OF NON-MAXWELLIAN PLASMAS,. ...

A dielectric loss study of porous MgO indicates that H2O absorption on MgO probably leads to the formation of surface defects as well as hydroxide ions. The ac conductivity, sigma sub ac followed the equation sigma sub ac=sigma sub 1 + KP sub H2O to the 0...

The distribution of the Hall voltage induced by low-frequency AC current is studied theoretically in the incoherent linear transport of quantum Hall systems. It is shown that the Hall-voltage distribution makes a crossover from the uniform distribution to a concentrated-near-edges distribution as the frequency is increased or the diagonal ...

This paper summarizes the results of a study conducted by the US Department of Energy, Office of Energy Storage and Distribution, to determine generic cost differences between dc and ac systems, and to identify situations where dc is clearly advantageous for long distance and bulk power transport. Data are presented which can aid in ...

The electrical properties of alizarin doped anthraquinone were investigated using a complex impedance spectroscopy technique. Dielectric study revealed a phase transition from the semiconducting to the conducting state at 53�C. The dielectric relaxation was found to be of non-Debye type. Evidence of temperature-dependent electrical relaxation phenomena ...

Temperature and frequency dependence of a.c. conductivity have been studied in glassy Se{70}Te{30-x}Sb{x} (2 ? x ? 10). An agreement between experimental and theoretical results suggests that the a.c. conductivity behaviour of Se-Te-Sb system can be successfully explained by correlated barrier ...

A literature study on magnetic-inductive flowmeters for low conducting liquids was carried out and a special flowhead for this application has been constructed. The measurement on the primary head have been carried out with an ac-field and with a keyed-dc...

We report the results of a numerical study of the ac conductivity for the Anderson model of a one-dimensional, site-disordered system of 400 atoms. For different degrees of disorder, we directly diagonalized the Anderson Hamiltonian, used the Kubo-Greenwood formula to evaluate the conductivity, and then averaged ...

With the progress in the linear motor, various kinds of magnetic levitating devices, most of them driven by dc current, are under study. In this paper, a simple magnetic levitating device driven by ac current is proposed. In this device, the cylindrical air gap is excited by an ac current and a thin nonmagnetic ...

Polyaniline is chemically synthesised and doped with camphor sulphonic acid. FTIR studies carried out on these samples indicate that the aromatic rings are retained after polymerisation. The percentage of crystallinity for polyaniline doped with camphor sulphonic acid has been estimated from the X-ray diffraction studies and is around 56% with respect to ...

A new dc/ac inversion for achieving an ac sinusoidal waveform synthesized by a series of quasisinusoidal pulses is described. A modified pulse-width-modulated (PWM) controller is presented for driving the power switch to operate in a forced discontinuous-conduction mode (FDCM) so as to achieve series-resonance in the power stage. The ...

This paper presents an experimental investigation on AC conductivity and dielectric behavior of carbon black reinforced high density polyethylene (HDPE-CB) and HDPE-CB filled with multiwalled carbon nanotubes (MWNTs-CB-HDPE) and Polyaniline (PAni) coated MWNTs-CB-HDPE nanocomposites. The electrical properties such as dielectric constant ...

This paper presents an experimental investigation on AC conductivity and dielectric behavior of carbon black reinforced high density polyethylene (HDPE-CB) and HDPE-CB filled with multiwalled carbon nanotubes (MWNTs-CB-HDPE) and Polyaniline (PAni) coated MWNTs-CB-HDPE nanocomposites. The electrical properties such as dielectric constant (?'), dissipation ...

Gold nanoparticles have been synthesized in a base glass with composition 30Li2O-70B2O3 using gold chloride (HAuCl4.3H2O) as a dopant. The samples are characterized using XRD, ESR, SEM and optical absorption in the visible range. AC conductivity studies have been performed at RT over a frequency range 100 to 10 MHz. The dc ...

The A.C. conductivity and dielectric properties of Bi2Cu0.1V0.9O5.35 thin films were studied as a function of frequency and temperature. The A.C. conductivity of Bi2Cu0.1V0.9O5.35 film increases with frequency. The low frequency region corresponds to the D.C. conductivity ...

The study is part of the National Network for Environmental Management Studies conducted under the auspices of the Office of Cooperative Environmental Management--U.S. Environmental Protection Agency. The study is an evaluation of the ability of state-of-...

Ionic conductivity for the chitosan-NH4CF3SO3 system was conducted over a wide range of frequency and at temperatures between 298 and 313 K. Dielectric data were analyzed using complex permittivity ?* and complex electrical modulus M* for the sample with the highest ionic conductivity at various temperatures. The temperature-dependent ...

This paper presents the preliminary design of poloidal field power supply system of HT-7U super-conducting tokamak. With an emphasis on AC/DC power converter, DC circuit breaker, quench protection, harmonic suppression and static var. compensation, and AC power system, the design principle and features are introduced, the design scheme ...

We study quantum spin-rotation effects for a single-molecule magnet bridged between two conducting leads in the ac and dc magnetic fields. The Landau�Zener dynamics induced by the magnetic field generates mechanical torque, making the molecule to oscillate. This mechanical motion of the molecule exhibits unique features that can be ...

In this study, we have investigated the properties of discontinuous-Co80Fe20/?-Fe2O3 multilayers by AC impedance technology. The specific feature of the impedance spectra varies with of Co80Fe20 layer characteristics, being related to isolated sate or percolation state of Co80Fe20 cluster in ?-Fe2O3 matrix. The equivalent-circuit analysis implies that the ...

Lotus stalk activated carbon (AC) was produced by ultrasound digestion of lotus stalks in H(3)PO(4). Copper nitrate and iron nitrate were used to impregnate AC, producing Cu(II)-impregnated AC (AC-Cu) and Fe(III)-impregnated AC (AC-Fe). The modified ACs ...

The ac conductance in granular insulating Co-ZrO{sub 2} thin films prepared by pulsed laser deposition is systematically studied as a function of the Co volume content x. An absorption phenomenon at low frequencies that mimics the universal response of disordered dielectric materials is observed in the range of metal content below the ...

in Japanese culture, history, society, arts, literature, politics, and economics. All classes are conductedJapanese and Asian Studies Program (JASP) http://www.mejiro.ac.jp/international/jasp/future_stdnts/ jasp.html The Mejiro University Japanese and Asian Studies Program for International Students (JASP

This report presents results of a study to determine the fatigue behavior of rubber modified pavements in Alaska in comparison with conventional asphalt concrete pavements. Laboratory studies were conducted on field specimens using the flexural fatigue test in the controlled-displacement mode. Tests were performed at 72 deg F and 40 ...

Changes in the metabolism of polyunsaturated fatty acids (PUFA), both in children on the high fat ketogenic diet (KD) for seizure control and in rats on a KD enriched in PUFA, raise the possibility that increased brain arachidonic acid (ARA) and/or docosahexaenoic acid (DHA) may contribute to better seizure control. Our studies with PUFA and several other reports raise the ...

Sb2Te3 single crystals have been grown by Travelling Heater Method. EDAX was carried out for confirmation of constituent elements. By the measurements of Dielectric constant (k) and dielectric loss (tan?), we are able to understand various polarization mechanism in the grown crystals such as space charge polarization, orientational polarization of dipoles and atomic polarization of lattice. ...

The ubiquitous power-law frequency dependence observed for the ac conductivity in highly disordered semiconductors has a number of competing explanations. We review these mechanisms and discuss their relation to a simple Langevin theory for conductivity in confined regions. The theory is used to interpret recent measurements of the ...

... 3 Valence Bond Cluster Studies of Alkali Metal/Semiconductor Bondi'jg by S'"RC, ... AcC;j Fr,. bonding Including the transition fre. a ron-conducting - ...

This experimental study for breakdown of spent metal cleaning solvent solutions of ethylenediaminetetra acetic acid (EDTA) and nitrilotriacetate (NTA) was conducted under DOE contract DE-AC07-80ID12169. Objectives of the study were to release and recover ...

An Advanced Active Twist Rotor (AATR) is currently being developed by the U.S. Army Vehicle Technology Directorate at NASA Langley Research Center. As a part of this effort, an analytical study was conducted to determine the impact of blade geometry on ac...

Previous studies have demonstrated the ability of AC iontophoresis to control skin resistance in different transdermal iontophoresis applications. The objectives of the present study were to (a) identify the alternating current (AC) frequency for the optimization of AC pore induction of human ...

Previous studies have demonstrated the ability of AC iontophoresis to control skin resistance in different transdermal iontophoresis applications. The objectives of the present study were to (a) identify the alternating current (AC) frequency for the optimization of AC pore induction of human ...

Structural characteristics, thermal transitions and molecular dynamics of selected poly(amide urethane)s with transition metal acetyl acetonates Me(AcAc)(2) (Me = Sn(4+), Zn(2+), Cu(2+), Pb(2+)) as chain extenders, were comparatively investigated using small- and wide-angle X-ray scattering (SAXS, WAXS), differential scanning calorimetry (DSC), and dielectric techniques ...

Structural characteristics, thermal transitions and molecular dynamics of selected poly(amide urethane)s with transition metal acetyl acetonates Me(AcAc){2} (Me = Sn4+, Zn2+, Cu2+, Pb2+) as chain extenders, were comparatively investigated using small- and wide-angle X-ray scattering (SAXS, WAXS), differential scanning calorimetry (DSC), and dielectric techniques (dielectric ...

The purpose of this research is to study enhanced ionic transport in compounds containing a dispersed second phase. During this period, the following studies were carried out: A.C. conductivity of KI-KBr system within the solid solution regime; A.C. condu...

The d-c characteristics of semiconductor diodes are reviewed, and the effects of high-frequency a-c or highspeed pulse inputs on these characteristics are studied. The a-c parameters studied include charge storage, conductivity modulation, and capacitance. These parameters are tabulated ...

The scientific and technical basis for an Advanced Camera (AC) for the Hubble Space Telescope (HST) is discussed. In March 1992, the NASA Program Scientist for HST invited the Space Telescope Science Institute to conduct a community-based study of an AC, ...

Larvae of the bollworm Helicoverpa zea (Boddie) show some tolerance to Bacillus thuringiensis (Bt) Cry1Ac, and can survive on Cry1Ac-expressing Bt cotton, which should increase resistance development concerns. However, field-evolved resistance has not yet been observed. In a previous study, a population of H. zea was selected for ...

Since air-conducted (AC) and clinical (mastoid) bone-conducted (BC) sounds interact in the cochlea (e.g. pitch, cancellation, masking, beats), it has been thought that both AC and BC stimulations lead to a mechanical wave in the cochlea. However, there are also "non-osseous" forms of BC, i.e. auditory sensation ...

We study the ac conductivity as well as magneto-optical effects in a wide range of spectrum from infrared to visible parts. The calculations are based on the kinetic exchange model, which treats the disorder effects perturbatively within the Born approximation. We present the results for the ten-band Kohn-Luttinger (KL) model with six ...

Glasses in the system xLi2SO4-20Li2O-(80-x) [80P2O5-20V2O5] (5>=x>=20 mol%) has been prepared by melt quenching method. Dc and ac conductivity has been studied over a wide range of frequency (10 Hz to 10 MHz) and temperature (298 K-523 K). The dc conductivity found to increase with increase of Li2SO4 ...

... OF A TYPICAL ELECTROMECHANICAL AC VOLTAGE REGULATOR AND POSSIBLE ... Descriptors : *VOLTAGE REGULATORS, DESIGN, TESTS. ...

Little is known about researchers' practices regarding the provision of ancillary care (AC) in public health intervention studies they have conducted and the factors that influence their decisions about whether to provide ancillary care in low-resource settings. We conducted 52 in-person in-depth interviews with ...

... The theory of AC conductivity for a weakly ionized gas is reviewed ... expression for the conductivity of a weakly ionized mixture of gases is formulated ...

Experimental approaches for recording ac impedance data are discussed in this paper. Considerations of the high frequency performance of potentiostats and reference electrodes are given and experimental results are presented. Additional methods for analysis of experimental impedance data are discussed, with emphasis on the CIRFIT computer program. +BTA and Al 2024/3.5% NaCl ...

We present a detailed theoretical investigation on the transport properties of the one dimensional quantum rings. The Aharonov-Bohm effects under the low-voltage and low-frequency perturbation have been carefully studied. Scattering matrix method is adopted to obtain the ac response at external perturbation. The results show that the dc and ...

This paper summarizes the results of a study conducted by the US Department of Energy, Office of Energy Storage and Distribution, to determine generic cost differences between dc and ac systems, and to identify situations where dc is clearly advantageous for long distance and bulk power transport. Data are presented which can aid in ...

In a study conducted by the General Electric Company for EPRI, the power modulation of a high-voltage direct-current (HVDC) system for stabilization of an ac/dc network was investigated. The use of both active and reactive power modulation (as opposed to ...

The goal of this project was to develop a transposon mutagenesis system for lettuce and to clone and characterize disease resistance genes by transposon tagging. The majority of studies were conducted with the Ac/Ds System. Researchers made and tested sev...

Crystalline defects and ionic transport in potassium and rubidium azide have been studied by measuring the electrical conductivity with an a.c. bridge technique and the diffusion of cations by a tracer sectioning technique. Methods were developed to grow ...

A major field study and evaluation has been conducted into the effectiveness of three structural overlay types for portland cement concrete (PCC) pavements. These include sawing and sealing asphalt concrete (AC) overlays of PCC pavements, cracking and sea...

Laboratory experiments have been conducted on aged asphalt concrete (AC) pavement samples obtained from three Naval airfields and two civil airports to develop and establish criteria and design guidelines for recycling such pavements. In these experiments...

Despite a number of studies describing the fate of Bacillus thuringiensis insecticidal endotoxins in soil have been conducted in the past decade, conflicting information on persistence of this class of insecticidal toxins exists. In the present experiment, 14C from glucose was incorporated into the ...

An investigation of means of promoting the low temperature paraorthohydrogen reaction was conducted. The principal means studied was the synthesis of active heterogeneous catalysts; this approach succeeded in producing a catalyst that was 29 times more ac...

This study was conducted to verify the compliance of vehicular and pedestrian LED traffic signal modules with the Institute of Transportation Engineers specifications; and to assess drivers preferences of the LED modules. Four vehicular modules (ACS, Dial...

This report describes the results of the first year of an investigation that was conducted during the period of May, 1982 to March, 1983. The objectives of the investigation were to: 1) Determine the kinetic behaviour of pyrite oxidation and subsequent ac...

A chemical reaction conducted in a wax cylinder was used in this study to simulate a CDA occurring in a reactor. The exothermic reaction of dimethyl sulfoxide (DMSO) with acetyl chloride (AC) was used as the chemical reaction to simulate the internally he...

This study was conducted as part of the International Life Sciences Institute (ILSI) program to evaluate the carcinogenic potential of clofibrate, a nongenotoxic, peroxisome proliferator-activated receptor (PPAR) alpha agonist following oral administration to Tg.AC (transgenic) and wild-type FVB (nontransgenic) mice for a minimum for 6 ...

Oxidation treatment on the adsorption and the stability of Hg on activated carbon (AC) was inrestigated. Both MnO2-AC and FeCl3-AC were produced during oxidation treatment. The measurement of modified AC's mercury adsorption capacity was conducted in a simulated coal-fired flue gas by adsorbing ...

to conduct physical experiments to validate (or disprove) our previous work and inspire new research.diefenbach@gsb.strath.ac.uk T 553 6154 Offering: Qualitative research man- agement studies, organisation theory, socio.illes@strath.ac.uk T 4542 Linear and nonlinear programming, theory, algorithms, applications. ...

A preliminary design study of flight-type dc conduction-permanent magnetic, ac helical induction, and ac linear induction pumps for circulating 883 K (1130 F) NaK at 9.1 kg/sec (20 lb/sec) is described. Various electromagnetic pump geometrics are evaluate...

This study was conducted to evaluate the impact of dwell time, surface roughness, and the surface activation state on 1,1,1-trichloroethane's (TCA's) effectiveness for removing silicone oil from D6ac steel. Silicone-contaminated test articles were washed ...

Lead monoxide filled isophthalate resin particulate polymer composites were prepared with different filler concentrations and investigated for physical, thermal, mechanical and gamma radiation shielding characteristics. This paper discusses about the dielectric properties of the composites. The present study showed that the dielectric constant (?'), dielectric loss (V'') and ...

Although much research has been conducted concerning the losses of high-(Tc) superconductors, very little has concentrated on the self-field losses in an actual magnet arrangement. The coils studied in this work were designed for use as actual magnets in ...

Impedance spectroscopy has been used to study the effect of kaolinite grain sizes on the AC electrical properties of kaolinite/polystyrene composites under different temperatures and applied frequencies. Impedance measurements were performed on prepared composites containing 20% kaolinite mineral of grain sizes 63, 106, 212, and 300 ?m in addition to neat ...

Abstract Conclusion: This study showed that the ocular vestibular evoked myogenic potential (oVEMP) in response to air-conducted sound (ACS) reflects functions of different parts of the vestibular labyrinth from cervical VEMP (cVEMP). Objective: To determine whether the origin of the vestibular end organs of the oVEMP in response to ...

A study has been conducted by the Florida Solar Energy Center (FSEC) to examine if space cooling energy savings can be achieved from shading of residential air conditioning (AC) condenser units. The investigation consisted of before-and-after experiments conducted on three homes over a two year period. A recent EPA ...

... Accession Number : ADD854901. Title : Inductance Effect in the AC Impedance of Conducting Polypyrrole Films. Descriptive Note : Journal article,. ...

The main purpose of this paper is to holographically study the behavior of conductivity in 2+1 dimensional disordered systems. We analyze probe D-brane systems in AdS/CFT with random closed string and open string background fields. We give a prescription of calculating the DC conductivity holographically in disordered systems. In ...

Large conducting space structures in low Earth orbit will have a nonnegligible induced potential across their structures. The induced current flow through the body and the ionosphere causes the radiation of Alfven and lower-hybrid waves. This current flow is taken to be ac, and the radiated power is studied as a function of the ...

Large conducting space structures in low Earth orbit will have a nonnegligible motionally induced potential across their structures. The induced current flow through the body and the ionosphere causes the radiation of Alfven and lower hybrid waves. This current flow is taken to be ac, and the radiated power is studied as a function of ...

Humidity sensing characteristics of NiO/Al2O3 nanocomposites, prepared by sol-gel method, are studied by impedance spectroscopy. Modeling of the obtained impedance spectra with an appropriate equivalent circuit enables us to separate the electrical responses of the tightly bound chemisorbed water molecules on the grain surfaces and the loosely associated physisorbed water ...

We report the mechanical alloying of ?-Fe2O3 and Ga2O3 powders to synthesize ?-Fe1.4Ga0.6O3 compound. We have used XRD spectrum to evaluate crystalline structure and associated parameters. AC conductivity showed that the synthesized alloy is a poor conductor, but conductivity drastically (nearly 4 decade) enhanced at higher ...

Open circuit emf and ac conductivity studies were conducted on two batches of polycrystalline thoria. The open circuit emf data were used to delineate the low oxygen partial pressure ionic domain boundary for 'pure' thoria; presented as a line log for the...

PurposeAs a continuing effort to understand the mechanisms of alternating current (AC) transdermal iontophoresis and the iontophoretic transport pathways in the stratum corneum (SC), the objectives of the present study were to determine the interplay of AC frequency, AC voltage, and iontophoretic transport of ionic ...

Measurements of intrinsic conductance fluctuations often make use of a.c. modulation methods. Such methods are beneficial in reducing the contribution of amplifier noise to the final power spectrum and also in rejecting Johnson noise. The present study has two goals. First, we reexamine a.c. modulation methods when ...

Aim of the study was to investigate, in a randomized prospective trial, air-conducted vestibular evoked myogenic potentials (AC-VEMPs) and bone-conducted vestibular evoked myogenic potentials (BC-VEMPs) before and after successful stapedotomy. Enrolled in the study were 41 consecutive patients ...

SummaryAim of the study was to investigate, in a randomized prospective trial, air-conducted vestibular evoked myogenic potentials (AC-VEMPs) and bone-conducted vestibular evoked myogenic potentials (BC-VEMPs) before and after successful stapedotomy. Enrolled in the study were 41 consecutive ...

A previous in vitro constant electrical resistance alternating current (AC) iontophoresis study with human epidermal membrane (HEM) and a model neutral permeant has shown less inter- and intra-sample variability in iontophoretic transport relative to conventional constant direct current (DC) iontophoresis. The objectives of the present ...

... Title : AC/ARNG Integrated Division Concept Study, Main Report, Volume 1. ... (3) Alternative 3 was an AOE division with an AC HHC. ...

... Title : AC/ARNG Integrated Division Concept Study, Appendices, Volume 3. ... (3) Alternative 3 was an AOE division with an AC HHC. ...

BackgroundThe Ca²⁺/calmodulin-stimulated adenylyl cyclase (AC) isoforms AC1 and AC8, couple NMDA receptor activation to cAMP signaling pathways in neurons and are important for development, learning and memory, drug addiction and persistent pain. AC1 and AC8 in the ...

The viscous response of electrorheological fluids is usually manipulated through the use of DC or uniaxial AC electric fields. The result is that fibrillated structures parallel to the field form in a quiescent fluid; the distortion of such structures in a flow determines the enhanced viscous response, at least at low and moderate flow rates. We have ...

The lithium ionic conductivity of materials prepared by reaction of lithium iodide with anhydrous and hydrated aluminum sulfate has been investigated by ac conductivity and NMR techniques. The ac measurements indicated thermally activated diffusion with an activation energy of 8.3 kcal/mol. From Li-7 NMR, the ...

ObjectivesTo analyze frequency-specific hearing results after surgery for chronic ear diseases while considering pathological findings and various surgical factors.MethodsPatients who underwent surgical management of chronic otitis media were reviewed retrospectively (n=559). Using pure tone audiometry, air conduction (AC), bone ...

It is important to generate fast fluid flow yet maintain low temperature rise for ac electrothermal (ac ET) pumping in microsystems with conductive fluids. This has been generally the limitation of ac ET driven micropump applications. We present an enhanced ac ET pumping mechanism using low ...

The electrical properties of alizarin, a ?-conjugated organic semiconductor, were investigated by the complex impedance spectroscopy technique. A transition from semiconducting to conducting state has been observed and the transition temperature shifts to higher side with the increment in frequency. The dielectric relaxation was found to be of non-Debye type (polydispersive). ...

Measurement of electrodermal activity (EDA) has been an important tool in psychophysiological research. The emotional sweat activity is very sensitive to psychological stimuli or conditions. The changes are easily detected by means of electrical measurements and since the sweat ducts are predominantly resistive, a low-frequency conductance measurement is appropriate for ...

In this work an endeavor has been made to prepare conductive polymer composites using natural rubber as the matrix and conducting NR powder as the filler. The intrinsically conducting cis1,4 polyisoprene powder was prepared by treating the materials with Lewis acid treatment. The filler concentration was varied from 10 phr to 50 phr. ...

Silver ion conducting polymer electrolyte films based on Poly acrylamide (PAAM) with EC (Ethylene Carbonate) as plasticizer have been prepared by the novel hot press technique. The complexation of polymer with AgNO3 salt has been confirmed by X-ray diffraction and infrared studies. The electrical conductivity estimated using impedance ...

The temperature and frequency dependences of the dielectric functions and ac conductivities ((sigma)(sub ac)) of several boron carbide compositions in the single phase region (9--20 at. % C) have been investigated. The low temperature (

...to be connected to the public utility (AC) power line, the radio frequency voltage that is conducted back onto the AC power line on any frequency or frequencies...operation and which do not operate from the AC power lines or contain provisions for...

...to be connected to the public utility (AC) power line, the radio frequency voltage that is conducted back onto the AC power line on any frequency or frequencies...to be connected to the public utility (AC) power line, the radio frequency...

Baculoviruses produce two progeny phenotypes during their replication cycles. The occlusion-derived virus (ODV) is responsible for initiating primary infection in the larval midgut, and the budded virus (BV) phenotype is responsible for the secondary infection. The proteomics of several baculovirus ODVs have been revealed, but so far, no extensive analysis of BV-associated proteins has been ...

Baculoviruses produce two progeny phenotypes during their replication cycles. The occlusion-derived virus (ODV) is responsible for initiating primary infection in the larval midgut, and the budded virus (BV) phenotype is responsible for the secondary infection. The proteomics of several baculovirus ODVs have been revealed, but so far, no extensive analysis of BV-associated proteins has been ...

... Accession Number : AD0131786. Title : STUDY ON AC GENERATING MACHINE CHARACTERISTICS FOR AIRCRAFT ELECTRIC SYSTEMS. ...

Dielectric constant and ac conductivity of highly c-axis oriented LiNbO3 thin film grown by pulsed laser deposition were studied in a metal-insulator-metal configuration over a wide temperature (200 to 450 K) and frequency (100 Hz to 1 MHz) range. The preferred oriented Al (1%) doped ZnO film with electrical ...

The results of dc and ac conductivity measurements and a photoconductivity study on some one-dimensionally conductive mixed-valence complexes of the type M(A)X3, where M = Pd, Pt, (A) = en, (NH3)2, and X = Cl, Br, I, are reported. These results suggest th...

The paper presents the results of the dc performance of polymeric insulating materials in a fog chamber. The materials evaluated in fog produced from low (250 ..mu..S/cm) and high (1000 ..mu..S/cm) conductivity water include cylindrical rod samples of high temperature vulcanized (HTV) silicone rubber and ethylene propylene diene monomer (EPDM) rubber containing various amounts ...

The effects of gigarad-level total absorbed doses from 1-MeV electrons on the post-irradiation alternating-current (ac) and direct-current (dc) electrical properties and the unpaired electron densities have been studied for Kapton, Ultem, and Mylar. The unpaired electron densities (determined from electron paramagnetic resonance spectroscopy) and the dc ...

The exact frequency dependence of the ac hopping conductivity of a one-dimensional chain with random interruptions is obtained. The real and imaginary parts of the ac conductivity are shown to vanish quadratically and linearly, respectively, with frequency at the static limit. Critical behavior of the ...

... SAMPLE AND AN AC MAGNETIC FIELD ... FREQUENCY, WHERE IMPEDANCE HERE IS ... THE RECONSTRUCTION METHOD ARE PRESENTED ...

We reveal from numerical study that the optical Hall conductivity sigma(xy)(omega) has a characteristic feature even in the ac ( approximately THz) regime in that the Hall plateaus are retained both in the ordinary two-dimensional electron gas and in graphene in the quantum Hall regime, although the plateau height is no longer ...

We study the axisymmetric breakup and satellite formation of slender jets surrounded by a concentrically placed cylindrical electrode and subjected to time-dependent AC electric fields. The jet is assumed to be a perfectly conducting viscous fluid and surrounded by a dielectric inviscid gas. We use the long-wave approximation to derive ...

We study the axisymmetric breakup and satellite formation of slender jets surrounded by a concentrically placed cylindrical electrode and subjected to time-dependent AC electric fields. The jet is assumed to be a perfectly conducting viscous fluid and surrounded by a dielectric inviscid gas. We use the long-wave approximation to derive ...

The purpose of this research is to study the enhanced ionic transport in solid electrolytes containing a dispersed second phase. During this six month period, the following studies were initiated: (1) ac conductivity of the KI-KBr system from 50 m/o KI to 100 m/o KI and the effect of moisture on the ...

TlInS2 single crystals were grown by using Bridgman-Stockbauer technique. Measurements of DC conductivity were carried out in parallel (?//) and perpendicular (??) directions to the c-axis over a temperature range from 303 to 463 K. The anisotropic behaviour of the electrical conductivity was also detected. AC ...

... From the latter, the coil impedance and the ... FIELDS, HALL EFFECT, ELECTRICAL IMPEDANCE, COILS, VOLTAGE, CONDUCTIVITY ...

The dependence of the contact potential difference (CPD) reading on the ac driving amplitude in scanning Kelvin probe microscope (SKPM) hinders researchers from quantifying true material properties. We show theoretically and demonstrate experimentally that an ac driving amplitude dependence in the SKPM measurement can come from a systematic error, and it ...

Experimental and theoretical studies were conducted to investigate the control of charge and modification of nonlinear oscillations of externally injected dust particles in a dc discharge. The superposition of ac voltage on a dc cathode led to plasma density modulation, which brought about a drastic change of particle oscillation ...

Electronic transport in a-C films has been the subject of considerable debate. In this study, combined stress relaxation and electrical transport studies were used to identify the transport mechanism in a-C films prepared by pulsed-laser deposition. The stress relaxation was modeled by a first-order kinetic ...

Thin chalcogenide films of Bi30 Se(70-x) Tex (x=35, 40, and 45 at%), with a thickness of about 200 nm, have been prepared by the thermal evaporation technique. The physical properties that have been studied are: the density (d), the heat of atomisation (Hs), the average coordination number (Z), and the number of lone pair bonds. The AC ...

Single phase perovskite Ba(Sr1/3Nb2/3)O3 ceramics was prepared using the columbite precursor method. X-ray diffraction (XRD) technique is used to verify the single phase formation. It stabilizes in hexagonal phase with lattice constants a=12.1243 � and c=15.3747 �. Impedance analysis shows distributed relaxation time. Single semicircular arc observed in complex impedance plot confirms that ...

Percolation phenomena, which include the ac and dc conductivity, dielectric constant, and magnetoresistance, are studied in a series of seven cellular composites, consisting of small conductor particles embedded on the surface of larger insulator particles. Carbon black (ground and unground), graphite, graphite boron-nitride, niobium ...

...approved two optional air conditioning test simulation procedures, AC1 and AC2, for the 2001...desires to conduct an alternative SC03 test simulation other than AC1 and AC2, or the AC1 and AC2 simulations for the 2004 and subsequent model...

Multilayer films containing polypyrrole mixed with palmitic acid were built up using a technique based on Langmuir-Blodgett deposition followed by two solid state reactions. The resulting films exhibited a room temperature, in-plane dc conductivity of 20 S 0022-3727/31/13/002/img10 and a conductivity in the out-of-plane direction seven orders of magnitude ...

The ac conductivity {sigma}({omega}) of three ionically conducting crystalline materials (NaClZn{sup 2+}, KTaO{sub 3}:Co{sup 3+},H{sup +}, and CeO{sub 2}:Gd{sup 3+}) and two glasses have been studied over an unusually wide temperature range. In all cases, limiting power-law behavior (exponent {ital s}=1 in ...

The thermomechanical effect of 1.56-?m fibre laser pulses on intervertebral disc cartilage has been studied using ac conductivity measurements with coaxial electrodes integrated with an optical fibre for laser radiation delivery to the tissue. The observed time dependences of tissue conductivity can be interpreted ...

The thermomechanical effect of 1.56-{mu}m fibre laser pulses on intervertebral disc cartilage has been studied using ac conductivity measurements with coaxial electrodes integrated with an optical fibre for laser radiation delivery to the tissue. The observed time dependences of tissue conductivity can be ...

Relaxation and conduction mechanisms under small ac fields of laser ablated ZrTiO4 thin films were analyzed in the light of impedance and modulus spectroscopy. The overall dielectric properties were mainly dominated by a Maxwell-Wagner type of relaxation with grains and the grain boundary two distinct parts of the circuit. Each of these parts was found to ...

Catalytic performances and the reaction mechanism of Co(3)O(4)/AC (AC=activated carbon) for aerobic oxidation of alcohols carried out in the liquid phase were investigated. Co(3)O(4)/AC shows a high activity for aerobic oxidation of benzyl alcohol, comparable to noble metal catalysts (e.g., Au/AC) even in the ...

A kinetic study on the reactions of the OH radical and ozone with acetylacetone (AcAc) has been performed in a 1080 L quartz glass reaction chamber using in situ FTIR spectroscopy analysis. Temperature dependent rate coefficients for the reaction of AcAc with the OH radical were determined over the temperature range 285-310 K using the ...

The total conductivity of KHCO3 compound is studied in the frequency range 50 Hz-1 MHz and in the temperature range 300-370 K. The conductivity frequency dependence relation is divided into three regions: one at low frequency (dc conductivity), while the others appear at a moderate and relatively higher frequency ...

This dissertation presents the development of an anisotropic viscoplastic continuum damage model to describe the permanent deformation of asphalt pavements. The model is developed to account for several phenomena that influence the permanent deformation of Asphalt Concrete (AC) at high temperatures. These phenomena include strain rate dependency, confining pressure dependency, ...

Conduction mechanism in ionic glasses is still considered one of the great challenges in physics and chemistry of glasses [A. Bunde, K. Funke, and M. Ingram, Solid State Ionics 105, 1 (1998)]. We show that consequent application of the routine percolation theory leads to the consistent description of most puzzling conduction effects for both direct current ...

AC Conductivity measurements have been used to study the transport properties of PbI2 doped silver boro-vanadate glasses prepared by melt quenching technique. The samples are characterized by XRD and DSC measurements. A correlation between R?, the decoupling index and ?dc has been observed. The observed ...

Differential scanning calorimetry (DSC) was used to identify the phase transitions of polyvinyl alcohol (PVA) doped with europium chloride (EuCl3) and terbium chloride (TbCl3). The dielectric constant and the loss tangent behavior of the investigated samples were studied as a function of temperature in the frequency range 1 100 kHz. The detailed analysis of the results showed ...

This procedure describes instrument log notebook inspections to be performed by the Quality Assurance Office Staff to document compliance with ACS Good Laboratory Practices (GLP). These GLPs are based on regulations promulgated by the FDA and EPA. The inspections were conducted e...

conducted in the Market Research Centre and the Department of Marketing at Massey University. The studies reported here represent all of the mail surveys conducted by the Market Research Centre and the Department) in the Department of Marketing, Massey University, or by researchers in the Market Research Centre (MRC) at Massey

The ac conductivity measurements have been carried out for the activated Ba/SrO cathode with additional 5% Ni powder for every 100 h acceleration life time at the temperature around 1125 K. The ac conductivity was studied as a function of temperature in the range 300 1200 K after conversion and ...

Acute coronary syndrome (ACS) is an important public health problem around the world. Since there is a considerable seasonal fluctuation in the incidence of ACS, climatic temperature may have an impact on the onset of this disease. The objective of this study was to assess the relationship between the average daily temperature, diurnal ...

Natural water treatment systems such as bank filtration have been recognized as providing effective barriers in the multi-barrier approach for attenuation of organic micropollutants for safe drinking water supply. In this study, the role of biodegradation in the removal of selected pharmaceutically active compounds (PhACs) during soil passage was ...

The a.c. impedance method is a very useful technique for studying the corrosion behaviour of surgical implant alloys. In this article information is presented on how to efficiently and reliably acquire and analyse experimental data through the use of Nyquist, Bode and Rre versus omega Rim plots. Also, experiments were conducted in ...

Cupric chloride-impregnated activated carbon sorbents (CuCl{sub 2}-ACs) showed good performance in Hg{sup 0} oxidation and adsorption in previously published entrained-flow test results. In addition, our previous studies indicated that Hg{sup 0} is oxidized by CuCl{sub 2}-ACs and the resultant oxidized mercury is readsorbed onto the ...

The weather in Kuwait is very dry where the dry-bulb temperature exceeds the wet-bulb temperature more than 20oC in most of the summer months. Thus, the air-conditioning (A/C) system with the water-cooled (WC) condensers is expected to perform more efficiently than with the air-cooled (AC) condensers. This fact was behind the idea of a field ...

In recent times antiferroelectric thin-film material compositions have been identified as one of the most significant thin films for development of devices such as high charge storage, charge couplers/decouplers, and high strain microelectromechanical systems. Thus, understanding the dielectric and electrical properties under an ac signal drive in these antiferroelectric ...

The ac and dc conductivities of single-crystal and polycrystalline NaCl were measured as a function of both temperature and particle size. The ac conductivity results for single-crystal NaCl agreed well with the literature. In the intrinsic range, however...

We discuss results of ac impedance spectroscopy and dc I-V measurements applied to microbial biofilms and demonstrate that the biofilms of Geobacter sulfurreducens that grow on the anodes of microbial fuel cells are electronically conductive, with conductivities comparable to conjugated polymers. To investigate the components ...

This protocol provides an overview of the schedule, scripting, and logistics for home visits conducted in the NHEXAS Region 5 study. By its nature, this protocol provides a general description of these activities, since the actual schedule was subject to change due to outside cir...

The dynamical conductance of electrically contacted single-walled carbon nanotubes is measured from dc to 10 GHz as a function of source-drain voltage in both the low-field and high-field limits. The ac conductance of the nanotube itself is found to be equal to the dc conductance over the frequency range ...

Some electrical properties, such as piezoelectricity, ac conductivity, dielectric constant and loss tangent of nine commercial types of dental composite restorative materials, have been investigated before and after laser exposure for 3s to study the effect of a probable laser exposure during some surgeries on the electrical properties ...

Heat conduction through the Frenkel-Kontorova chain under the influence of an ac driving force applied locally at one boundary is studied by nonequilibrium molecular dynamics simulations. We observe the occurrence of thermal resonance, namely, there exists a value of the driving frequency at which the heat flux takes its maximum value. ...

Poly(butylenes adipate) ionomers (PBAi) were synthesized using dimethyl 5-sulfoisophthalate sodium salt (DMSI) up to 5 mol% of diacid monomer. We have investigated electrical and dielectric properties of the ionomers to evaluate alternating current (AC) parameters such as impedance, conductance, dielectric constant, admittance, susceptance, dielectric ...

The role of G?? in adenylyl cyclase (AC) signaling is complicated due to its role as a conditional activator (AC2, AC4 and AC7) and an inhibitor (AC1, AC3 and AC8). AC2 is stimulated by G?(s) and if G?? is present the stimulation is ...

Background Several studies have shown a decrease in acute coronary syndrome (ACS) admissions after the implementation of 100% smoke-free legislation. However, no studies have been conducted in developing countries. Methods We conducted a time series analysis of ACS hospital ...

Advanced implantation systems used for semiconductor fabrication need to transport low energy ion beams. In this respect it is an advantage to employ a short beam line. Strong magnetic field in a compact footprint can enable shorter beam lines. In this work we report the use of a superconducting magnet to generate the strong magnetic field. We have developed a prototype superconducting ...

The effect of pressure P up to 2.5 X 10/sup 3/ MPa on the dielectric constant element of and conductivity G of a number of conjugated polymers doped by iodine has been studied. Polyphenylacetylene prepared with FeAcAc, polyphenylacetylene obtained with Ziegler catalyst, anionic polydiphenylacetylene, and polydiphenylbutadiene were ...

A new ion conducting nano composite polymer electrolytes (NCPEs) thin film based Poly (ethylene Oxide) PEO with AgCF3SO3 salt and SiO2 as nano filler has been prepared by solution- casting method. The salvation of porous filler with PEO has been confirmed by IR spectral studies. AC conductivity in the temperature ...

Susceptibility to the Cry1Ac toxin from Bacillus thuringiensis in tobacco budworm, Heliothis virescens (F.) (Lepidoptera: Noctuidae), is usually measured by performing bioassays under laboratory conditions. Accurate comparison of Cry1Ac susceptibility among H. virescens samples conducted in different places is challenged by several ...

In order to apply widely the superconductivity technology to electric power equipments, the development and evaluation on the AC superconducting cables have been conducted in the Central Research Institute of Electric Power Industry. The superconducting c...

This paper discusses the physics of ac losses in type-II superconductors and in multifilamentary superconducting-normal composite conductors. As an introduction, the ac eddy-current losses in a homogeneous normal conducting cylindrical specimen subjected ...

This lecture discusses the physics of ac losses in type-II superconductors and in multifilamentary superconducting-normal composite conductors. As an introduction, the ac eddy-current losses in a homogeneous normal conducting cylindrical specimen subjecte...

PbO-Bi2O3-As2O3 glasses mixed with different concentrations of TiO2 (ranging from 0 to 2.0 mol %) were prepared. The amorphous nature of the samples was confirmed by X-ray diffraction and scanning electron microscopy. Spectroscopic studies (viz., optical absorption, IR and ESR) and dielectric properties (viz., dielectric constant, dielectric loss and a.c. ...

The phenomena of electrical conductivity and diffusion in plasmas is analyzed. Expressions are derived for the DC and AC conductivity of anisotropic plasma, as well as of an anisotropic magnetoplasma, using the macroscopic equations pertinent to the cold ...

AC: DGFI/Horst Mueller. 1. What general areas of study at your center ..... up" message to the AWG/AC/AAC lists, sufficiently ...

The catalytic activity of the CoAcAc)/sub 2/-Et/sub 2/Al(AcAc) system in the hydrogenation of styrene and benzene has been studied and compared to the Co(AcAc)/sub 2/-AlEt/sub 3/ catalytic system. It is shown that the use of Et/sub 2/Al(AcAc) leads to a reduction of catalytic activity toward ...

We are developing AC electrokinetic micropumps to drive electrically conductive biological fluids in microchannels. These pumps work on the principles of Induced Charge Electroosmosis (ICEO) and flow Field Effect Transistor (flowFET) phenomena. AC (as well as DC) electric fields can induce electrical double layer on a polarizable ...

Utilization of a manual sampling function as an alternative to the automatic sampling function in the Alco-Sensor IV Black Dot Model has been recognized by the manufacturer to potentially underestimate an individual's true breath alcohol content (BrAC). A controlled human subject study was conducted to analyze the possible ...

Acetylated amino sugars, normally used in the biosynthesis of cell walls and cell membranes, were found to play a role as corepressors for catabolite repression of the lac operon in Escherichia coli. This conclusion was derived from studies conducted on mutants of E. coli that were able to assimilate an exogenous source of N-acetylglucosamine ...

Although much research has been conducted concerning the losses of high-{Tc} superconductors, very little has concentrated on the self-field losses in an actual magnet arrangement. The coils studied in this work were designed for use as actual magnets in an industrial application. Self field loss measurements were made upon tape-wound 2223 superconducting ...

It has been reported previously that people who are acclimated to naturally ventilated (NV) environments respond to hot and warm environments differently than people who are acclimated to air-conditioned (AC) environments. However, it is not clear whether physiological acclimatization contributes to this discrepancy. In order to study whether living and ...

The study was conducted to reveal the functional disturbances in two novel insulin and relaxin adenylyl cyclase signaling mechanisms (ACSMs). It was shown for the first time that in myometrium of pregnant women with insulin insufficiency the functional defects of Gs-protein-AC coupling in insulin- and relaxin H2-regulated ...

Patients with acute coronary syndrome (ACS) are in need of cost-intensive treatment involving different aspects of the German Health System. Percutaneous coronary intervention (PCI) is the treatment of choice for a large proportion of cases. In the present study, an analysis of the cost impact of ACS with focus on PCI therapy was ...

Idaho National Engineering Laboratory (INEL) evaluates EV propulsion systems and components for the U.S. Department of Energy (DOE) Electric and Hybrid Vehicle (EHV) Program. In this study, experimental data were used to evaluate the relative performances of the benchmark Chrysler/GE ETV-1 DC and the Ford/GE First Generation Single-Shaft AC (ETX-I) ...

Some commonly used spatial industry materials were studied in order to understand their ageing in GEO environment. Among these materials, a white commercial paint was the subject of several analyses. The material was submitted to proton irradiation with a total dose equivalent at the surface to 20 years in geostationary orbit. Several testing methods were used to characterize ...

This paper reports on a local electrochemical impedance spectroscopy (LEIS) technique for mapping the ac impedance distribution, as a function of frequency, of an electrode. In LEIS, as in traditional ac impedance methods, a sinusoidal voltage perturbation between the working and reference electrode is maintained by driving an ac ...

Using the nonequilibrium Green�s function combined with the density functional theory, we investigate the dynamic conductance of atomic wires consisting 4-9 carbon atoms in contact with two Al(100) electrodes. Our numerical results show that in addition to the dc conductance, both the real part and imaginary part of dynamic ...

The conduction mechanisms in nickel-doped ytttrium aluminum garnet (Ni:YAG) have been studied as a function of temperature and partial pressure of oxygen. The ac conductivity and ionic transference measurements show that Ni:YAG is a mixed ionic-electronic conductor with an ionic mobility characterized by an ...

Anthracene (AC) is a non-mutagenic and non-carcinogenic, low-molecular-weight polycyclic aromatic hydrocarbon present in the environment. Its toxicity can be dramatically increased after solar-light exposure. Biotransformation capacities of AC by Tetrahymena pyriformis and a selection of eight micromycetes were studied, and the ability ...

Complexes of the type MX/sub 2/AcAc(OR)/sub 2/, where M = Nb(V), Ta(V); X = Cl,Br; AcAc = acetylacetone; and R == CH/sub 5/, C/sub 2/H/sub 5/ were prepared from the metal pentahalides and acetylacetone in the parent alcoholic solutions. They are stable crystalline substances, but in solutions in alcohols interactions with solvent molecules occur, ...

Iodine and sulfur incorporated amorphous carbon (a-C) films are prepared by vapor phase pyrolysis of carbon rich organic precursor, maleic anhydride. Transmission electron microscopy (TEM) analysis depicts the intercalation induced local structural ordering and evolution of nano-graphitic phases in the sample. An X-ray photoelectron spectroscopy (XPS) ...

We report a comprehensive study of the complex ac conductance of amorphous superconducting InOx thin films. We measure the explicit frequency dependency of the complex conductance and the phase stiffness over a range from 0.21 to 15 GHz at temperatures down to 350 mK using a novel broadband microwave Corbino ...

In this paper we report the first experimental measurement of the low-temperature, normal-state infrared conductivity of ultrathin quenched-condensed Pb films. For dc sheet resistances such that {omega}{tau}<<1 the ac conductance increases with frequency but is in disagreement with the predictions of weak localization. We ...

We study the frequency-dependent conductance through quantum dots coupled to ferromagnetic leads in the Kondo regime. Using the Kubo formula, we relate the ac conductance of the system to the spectral functions of some local operators, which are calculated by using the numerical renormalization group. In the ...

The electromagnetic shielding properties of epoxy resin composites containing short carbon fibers coated with a layer of non-conducting polyaniline base have been studied. Below the percolation threshold the composites show a high AC conductivity at high frequencies (10-1300MHz) and low DC ...

The present work aims to study the effects of the blood-microstructure on the electrical conduction from two different but correlated properties: Electrical and mechanical (viscosity), and to derive useful parameters for the evaluation of electrical conduction as a function of the blood viscosity. ac-conductivity ...

The dielectric behavior of Ethylene Acrylic dipolymer (AEM DP) Elastomer vulcanizates with conductive carbon black (CCB-KetjenEC300J) has been investigated over a broad frequency range of 10 Hz-106 Hz. The influence of different loading of CCB (0-40 phr) on electrical property has been studied. Enhancement in the dielectric constant and ...

Polymer nano-composite electrolyte films based on Poly ethylene oxide (PEO)/NaI and indium oxide (In2O3) as a filler were prepared by solution casting technique. The XRD results reveal that the increase in filler concentration enhances the amorphous domains of PEO polymer matrix. The crystallite size of the samples is also observed to decrease with increase in filler concentration upto 15% and ...

The motion of mobile ions in glassy materials produces a dielectric response that is characteristically non-Debye. This deviation from ideal Debye behavior is evidenced both in the a.c. conductivity, {sigma}(f), which increases anomalously as a power law of the form {sigma}(f) = {sigma}{sub 0}(1+(f/f{sub 0}){sup n}), and in the electric modulus which is ...

The optical and electrical characteristics of kaolinite/polystyrene composites containing 20 wt% kaolinite with grain sizes of 63, 106, 212 and 300 �m and neat polystyrene were studied. The optical absorption spectra were collected in the wavelength range 300-800 nm using a spectrophotometer. The optical band gap and energy tail widths of localized states were determined for ...

Ion conducting polymer electrolyte PVA:NH(4)NO(3) has been prepared by solution casting technique and characterized using XRD, Raman and ac impedance spectroscopic analyses. The amorphous nature of the polymer films has been confirmed by XRD and Raman spectroscopy. An insight into the deconvoluted Raman peaks of upsilon(1) vibration of NO(3)(-) anion for ...

The purpose of this research is to study the enhanced ionic transport in solid electrolytes containing a dispersed second phase. During this six month period, the following studies were initiated: (1) ac conductivity of the KI-KBr system from 50 m/o KI to...

A study of the effect of polyaniline doping (with HCl) on the DC and AC conductivity of polyaniline is reported. Additional ESR studies are reported. It is concluded that the charge tansfer in pristine and doped polyaniline occurs through one-dimensional variable large hopping, that the charge transport is ...

This protocol provides general guidelines for staff safety and decorum during the National Human Exposure Assessment Survey (NHEXAS) pilot study. This includes guidelines to maintain confidentiality of the participants, staff identification, conduct in participant homes, dress, b...

Epidemiological work conducted under the Department of Energy contract AC22-82PC50001 is described. The program was initiated for monitoring the health status of solvent refined coal (SRC) workers and determining the long-term health effects associated wi...

in an instance of group creativity by conducting a pilot study that looked closely at a group of expert musicians musicians collaborate to compose, is a song (composition) that retains a structure once it is deemed with a group of expert musicians who were given the task of writing songs over a period of three weeks

AIM: To evaluate the prevalence of Sleep Apnea-Hypopnea Syndrome (SAHS) in patients who were admitted with Acute Coronary Syndrome (ACS) to the Coronary Care Unit (CCU) and the clinical predictors of SAHS in patients with ACS and to compare the results of the simple sleep test (SST) with polysomnography (PSG). METHODS: This was a prospective ...

In addition to activating cochlear receptors, air conducted sound (ACS) and bone conducted vibration (BCV) activate vestibular otolithic receptors, as shown by neurophysiological evidence from animal studies--evidence which is the foundation for using ACS and BCV for clinical vestibular testing ...