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 (

... strate and a thin strontium titanate substrate are recommended so that the thermal dissipation can ... AC Hall and conductivity measurements as ...

... ionic conductivity and compressive modulus were measured by AC impedance and compression respectively. Dynamic Mechanical Analysis was ...

such as ac and dc conductivity, Hall and Seebeck effects, magnetoresistivity, and thermal conductivity. Measurement of magnetic properties is another area of expertise 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 ...

... thermal conductivity of many common polar and polyatomic ... the reference phase has been shifted in ac- cordance with the system phase shift. ...

... Abstract : A program was conducted to obtain complete stress versus number of cycles (SN) curves for D6AC steel heat treated to an ultimate ...

... The results are compared with burst tests conducted on Shillelagh motor cases made from the 0.040-in.-thick D6AC steel. (Author). ...

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 ...

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

Alternating current (AC) electrokinetic motion of colloidal particles suspended in an aqueous medium and subjected to a spatially nonuniform AC electric field are examined using a simple theoretical model that considers the relative magnitudes of dielectrophoresis, electrophoresis, AC-electroosmosis, and Brownian motion. Dominant ...

The scaling properties of the ac conductivity of ion-conducting glasses have, in the last several years, led to considerable revision of our understanding of microscopic ion dynamics. Although the notion that frequency dependent dispersion of the ac conductivity is evidence ...

The AC magnetic susceptibility is an important probe for characterizing magnetic properties of many materials. In this effort, an innovative high-resolution AC susceptometer is constructed. It provides us a capability to conduct state-of-the art experiments in AC magnetometry for important ...

We present a fully nonequilibrium calculation of the low-temperature transport properties of a quantum dot in the Kondo regime when an ac potential is applied to the gate. We solve a time-dependent Anderson model with finite on-site Coulomb interaction. The interaction self-energy is calculated up to second order in perturbation theory in the on-site ...

The development of a new instrument is described and also techniques of measurement to determine; for fluids: (1) thermal conductivity, (2) dielectric constant, and hence (3) index of refraction, (4) electrical conductivity a.c., (5) electrical conductivi...

Alternating current (ac) electrokinetic motion of colloidal particles suspended in an aqueous medium and subjected to a spatially nonuniform ac electric field are examined using a simple theoretical model that considers the relative magnitudes of dielectrophoresis, electrophoresis, ac-electroosmosis, and Brownian motion. Dominant ...

In this paper, the cyclotron motion of a charged harmonic oscillator in contact with a dissipative heat bath is considered. Exact results for the ac conductivity are presented for three popular models: Ohmic, Drude and blackbody radiation heat bath models. Significant differences compared to the no memory results are observed in the real and imaginary ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 polyaniline emeraldine base. The change in ...

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

The kinesin-microtubule system plays an important role in intracellular transport and is a model system for integrating biomotor-driven transport into microengineered devices. AC electrokinetics provides a novel tool for manipulating and organizing microtubules in solution, enabling new experimental geometries for investigating and controlling the interactions of microtubules ...

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 ...

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 ...

Microwave non thermal plasma irradiation was conducted on active carbon (AC) preliminarily impregnated with poly(vinyl alcohol) (PVA) in order to modify the adsorption properties of active carbon, particularly to increase hydrophobicity. The plasma was produced by applying microwave power on the PVA-impregnated active carbon ...

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 deg F. Tested materials include (1) ...

... Title : High Frequency Properties of Electron Waveguides, AC- Admittance, Scattering Parameters, Plasma Oscillations. ...

The transmission electron microscopy images of in situ prepared multiwall carbon nanotubes (MWNTs) and polyaniline (PANI) composites show that nanotubes are well dispersed in aqueous medium, and the nanofibers of PANI facilitate intertube transport. Although low temperature transport indicates variable range hopping (VRH) mechanism, the dc and ac ...

A commercial bulk chalcogenide glass (Ge28Sb12Se60) was used as a source to fabricate amorphous thin films via thermal evaporation technique. At low frequencies (<1 MHz) impedance spectroscopy was performed to measure electrical properties. To measure ac conductivity at microwave frequencies, a split resonance cavity technique was ...

A noval ac superconducting cable is described. It consists of a composite structure having a superconducting surface along with a high thermally conductive material wherein the superconducting surface has the desired physical properties, geometrical shape and surface finish produced by the steps of depositing a superconducting layer ...

A novel ac superconducting article is described comprising a composite structure having a superconducting surface along with a high thermally conductive material. The superconducting surface has the desired physical properties, geometrical shape and surface finish produced by the steps of depositing a superconducting layer upon a ...

A novel ac superconducting article is described comprising a composite structure having a superconducting surface along with a high thermally conductive material wherein the superconducting surface has the desired physical properties, geometrical shape and surface finish produced by the steps of depositing a superconducting ...

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 ...

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 ...

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 ...

Glass ceramic superconductors were prepared by the melt-quenching method. The frequency and temperature dependence of dielectric constant ( ?'), dielectric loss ( ??) and loss tangent (tan ?) of these superconductors were investigated in the frequency range of 10 kHz-10 MHz and temperature range of 80-300 K using the capacitance-voltage (C-V) and conductance-voltage (G/w-V) ...

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 ...

We describe a method to determine whether a measured current in a break junction is due to electron tunneling via space or conduction through a molecule bridged between two electrodes. By modulating the electrode separation, we monitor both the DC and the AC components of the current. The AC component indicates if a molecule is ...

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 study were to address the following ...

Ion conduction in noncrystals (glasses, polymers, etc) has a number of properties in common. In fact, from a purely phenomenological point of view, these properties are even more widely observed: ion conduction behaves much like electronic conduction in disordered materials (e.g., amorphous ...

... YBCO Coated Conductors with Reduced AC Losses ... YBCO Coated Conductor, AC losses, RABiTS, Superconductor, Maganetic Properties ...

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 ...

The ac electrical properties of several Y-Al-Si oxynitride glasses were measured as a function of temperature at 20/sup 0/ to 625/sup 0/C in the frequency range 50 to 10/sup 5/Hz. The low-field dc conductivity was also determined. Dispersions in the dielectric constant associated with the peaks in the tan delta curves were observed in ...

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 ...

... 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 ...

As a first phase of an investigation of the creep buckling of columns and plates, materials properties tests were conducted on Ti-- 7A1-4Mo Titarium Alloy in both the annealed and heat treated conditions. Heat treatment to obtain optimum creep penformance was 1450 deg F-1 hr, FC to 1050 deg F, AC; 1050 deg F- 24 hr, ...

This letter describes the relationships between the composition and the dielectric and piezoelectric properties of hydroxyapatite-barium titanate composites for polarized bone substitutes. The ac conductivity and permittivity were characterized from 0.1 Hz to 1 MHz, along with measurements of the d33 piezoelectric charge coefficient. ...

The property of pyroelectric material finds application in infrared detection. A study was conducted to investigate the effect of inclusion of volcanic ash into cement and bonded with polyvinyl alcohol (PVA) giving cement:volcanic-ash systems. The ash used in this experiment is from the eruption of the Soufrière Hill volcano in the island of Montserrat, ...

A series of M-type hexaferrite samples with composition Sr{1-x}La{x}Fe{12}O{19} (x = 0.00, 0.05, 0.15 and 0.25) were prepared by standard ceramic technique. AC electrical conductivity measurements were carried out at different frequencies (20 Hz 1 MHz) and at different temperatures. The dielectric constant and dielectric loss tangent were measured in the ...

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...

Seebeck-coefficient, dc conductivity, ac conductivity from 10 kHz to 1 GHz and dielectric constant measurements have been made on hot-pressed samples of boron carbide Bsub(1-x)Csub(x) in the compositional range 0.13

High-density sintered disks of the composition 0.13 YO1.05 . 0.87 ThO2) are shown to be mixed conductors at high oxygen pressures (10-6 atm) by electrical conductivity and electrochemical cell measurements. The ac and dc conductivity measurements were mad...

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 ...

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 ...

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 ...

This paper considers an AC and DC electrical features of porous silicon (PSi) layers prepared by electrochemical etching. Measurements of capacitance frequency (C f), conductance frequency (G f), photoconductivity (PC) and current voltage (I V) were used for the investigation of the electrical properties of these structures.

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

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 layers. Dependence of the ...

The preparation of AcA-stabilized Ag nanoparticles and its application to make highly conductive thin films are reported. The AcA-stabilized Ag nanoparticles were prepared through a ligand exchange of original oleylamine (OLA)-coated Ag nanoparticles with acrylic acid (AcA), which acted as both an antisolvent and a ...

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 ...

The electrical conductivity and dielectric properties of the Zr0.8Ln0.2O1.9 (Ln = Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu) system which have a cubic fluorite-type structure were investigated in order to clarify a dynamic property of oxygen vacancy in oxide-ion conductors. The frequency dependences of dielectric constants (epsilonr') ...

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 ...

Electrical transport properties of nanocrystalline zinc ferrite were investigated in the temperature range 77?T?300 K, applying magnetic field upto 1 T in the frequency range 20 Hz 1 MHz. The DC conductivity follows a simple hopping type charge transport. The DC magnetoresistivity of the samples is negative, which has been explained by using tunnelling ...

Page 1. Electrical and Magnetic Properties of D6ac Steel SK Burke and ME Ibrahim ... Page 3. Electrical and Magnetic Properties of D6ac Steel ...

Optical devices utilizing flakes (also called platelets) suspended in a host fluid have optical characteristics, such as reflective properties, which are angular dependent in response to an AC field. The reflectivity may be Bragg-like, and the characteristics are obtained through the use of flakes of liquid crystal material, such as polymer liquid crystal ...

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 ...

Layered graphite oxide is used as host material for the synthesis of conducting polymer intercalated nanocomposites. Powder X-ray diffraction, Fourier transform infrared, and UV-VIS absorption spectra indicate the formation of polyaniline within the interlamellar spaces of graphite oxide. The red shift of UV-VIS absorption associated with graphite oxide is found. The direct ...

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 chosen for investigation. ...

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) study on these samples ...

Electrowetting is arguably the most flexible tool to control and vary the wettability of solid surfaces by an external control parameter. In this article we briefly discuss the physical origin of the electrowetting effect and subsequently present a number of approaches for selected novel applications. Specifically, we will discuss the use of EW as a tool to extract materials ...

... Accession Number : ADD134918. Title : Mechanical Properties of D6ac Steel Forging, Billet and Plate,. Descriptive Note : Technical Rept.,. ...

... Accession Number : ADA474883. Title : Electrical and Magnetic Properties of D6ac Steel. Descriptive Note : Technical note. ...

... Abstract : The effect of specimen thickness on the notch properties of D6AC steel heat treated to the 240 to 250 ksi strength level has been studied ...

... Title : Effect of Cooling Rate on the Mechanical Properties of AC4CH Aluminum Alloy Castings. Descriptive Note : Journal article,. ...

... ELEVATED TEMPERATURE FATIGUE PROPERTIES OF D6AC HIGH STRENGTH STEEL ... 1. Photomicrograph of D6AC - Vilella's Reagent, 1000X ...

Property enhancement in composites depends largely on the reinforcement. For fiber-reinforced composites, the distribution of fibers is crucial in determining the electrical and mechanical performance. Image analysis methods for characterization can be time-consuming and/or destructive. This work explores the capability of AC-impedance spectroscopy ...

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, ...

Room-temperature ionic liquids (RTILs) are liquids at room temperature and represent a new class of nonaqueous but polar solvents with high ionic conductivity. The conductivity property of carbon nanotubes/RTILs and carbon microbeads/RTILs composite materials has been studied using ac impedance technology. Enzyme ...

The distribution of an ac magnetic field in a conducting fiber composite of a finite length with components differing in their magnetic and electrical properties has been found. The geometry of the skin layer has been determined, and the degree of homogeneity of the magnetic field in samples representing a system of fibers regularly ...

...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...

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 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 the prepared ...

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 dc and ac electrical transport property of polyvinyl alcohol-multiwall carbon nanotubes composites has been investigated within a temperature range 77<=T<=300 K and in the frequency range 20 Hz-1 MHz in presence as well as in absence of a transverse magnetic field up to 1 T. The dc conductivity follows variable range hopping ...

A simple thermal chemical vapor deposition technique is employed for the pyrolysis of a natural precursor �camphor� and deposition of carbon films on alumina substrate at higher temperatures (600 900 �C). X-ray diffraction measurement reveals the amorphous structure of these films. The carbon films properties are found to significantly vary with the deposition ...

PbO-Ga2O3-P2O5 glasses containing different concentrations of Cr2O3 ranging from 0 to 1.0 mol % were prepared. The differential thermal analysis and dielectric properties (viz., constant epsilon', loss tan ?, a.c. conductivity ?ac over a wide range of frequency and temperature) have been studied as a function of ...

Most tissue-engineered cartilage constructs are more compliant than native articular cartilage (AC) and are poorly integrated to the surrounding tissue. To investigate the effect of an implanted tissue-engineered construct (TEC) with these inferior properties on the mechanical environment of both the engineered and adjacent native tissues, a finite element ...

Nine new heterocyclic {pi}-electron donors 10a-c, 11a-c, and 12a-c based upon the well-known TTF (tetrathiafulvalene) system, but incorporating a pyrrole, thiophene, or furan ring between the 1,3-thiole rings, have been synthesized. The compounds show two single-electron reversible oxidation waves in cyclic voltammetry. Some TCNQ ...

The ac conductivity and dielectric relaxation properties of silver selenomolybdate glasses, Y% AgI-(1-Y)%{MAg2O-F0.4SeO3-0.6MoO3} with varying dopant salt concentration, Y=20-80% have been investigated as a function of frequency and temperature. The dc conductivity is found to increase by more than two orders of ...

In this work, a tin oxide film was prepared on a silicon wafer. It has exhibited the typical behaviour of a metal-oxide-semiconductor (MOS) structure. This MOS structure was stressed with 60Co-? radiation in the total dose range of 0 500 kGy at room temperature. The effects of the 60Co gamma radiation on the following properties of Au/SnO2/n-Si (MOS) structures, have been ...

We have tried to determine the effects of 60Co gamma irradiation on properties of Au/SnO2/n-Si (MOS) structures such as dielectric constant (??), dielectric loss (??), tangent loss (tan ?) and ac conductivity (?ac). Three samples were fabricated with different deposition time. The samples were irradiated using a ...

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 ...

OBJECTIVE: To compare amplitudes, latencies, symmetry and the effects of age for both ocular and cervical vestibular evoked myogenic potentials (oVEMPs and cVEMPs) produced by different types of air- (AC) and bone-conducted (BC) stimuli. METHODS: Sixty-one normal subjects aged 18-80years participated. Both reflexes were recorded in response to ...

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 activation energy of 2.0-2.2 ...

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

...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...

The electrical and dielectric properties of CuFe1?xCrxO2 (0 <= x <= 1) powders, doped with 3% of Mg and prepared by solid-state reaction, were studied by broadband dielectric spectroscopy in the temperature range from ?100 to 150 �C. The frequency-dependent electrical and dielectric data have been discussed in the framework of a power law ...

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 ({lt}25 K) responses are found to be characteristic of phonon-assisted hopping transport. Evaluation of ...

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 (<25 K) responses are found to be characteristic of phonon-assisted hopping transport. Evaluation ...

The temperature and frequency dependences of the dielectric functions and ac conductivities (?ac) of several boron carbide compositions in the single phase region (9-20 at %C) have been investigated. The low temperature (<25 K) responses are found to be characteristic of phonon-assisted hopping transport. Evaluation of the various ...

In-situ neutron diffraction combined with AC impedance spectroscopy was applied successfully to investigate the correlation between crystal structure and electrical properties of the La2Mo2O9 oxide ion conducting electrolyte material. Neutron diffraction patterns were collected as a function of temperature while the ...

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 the hydrogenation of ...

In this paper, bulk polymeric composites with staggered orientation of carbon nanotubes (CNTs) in polymer matrix were prepared by means of a macro layer-by-layer (MLBL) method, while an alternating current (AC) electric field was applied for inducing alignment of the CNTs. Test results verified that there existed a relationship between conductive capacity ...

The variation of the relative permittivity epsilon'sub(r), the loss factor epsilon'' and a.c. conductivity sigma with the frequency of an applied electromagnetic field over the range 0.5 to 50 MHz has been studied in the leaf and stem tissues of three tro...

BS>The theoretical and experimental aspects of the growing of single crystals of cadmnium sulfide and the relationship of these aspects of crystal growth to such properties as conductivity; sensitivity to gamma rays, visible light, and other formas of energy; stability; and reproducibility are discussed. (A.C.)

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 dominated by polarons. The presence of high spin ...

. A slip silicone cover (SA8R-0.5, Grace Bio-Labs, USA) is sealed on the glass slide to form the chamber Erms is applied over a fluid body, energy is dissipated as 2 rmsEP = ( : electrolyte conductivity at high frequency. ACET effect occurs owing to the resistive property of the fluid, so its flow velocity

ZnF2-As2O3-TeO2 glasses mixed with different concentrations of V2O5 (ranging from 0 to 0.6 mol%) were synthesized. The amorphous nature of these glasses was checked by X-ray diffraction and scanning electron microscopy techniques. A variety of properties, i.e. optical absorption, photoluminescence, infrared, ESR spectra and dielectric properties (constant ...

... Descriptors : *ELECTROOSMOSIS, MECHANICAL PROPERTIES, POLARIZATION, LIQUIDS, THESES, MICROWAVES, ALTERNATING ...

... PROPERTIES), INTERMETALLIC COMPOUNDS, MAGNETIC MATERIALS, SAMARIUM, YTTERBIUM, PRASEODYMIUM, NIOBIUM ALLOYS ...

Complex impedance spectroscopic studies were carried out on RbNO3 and RbNO3 Al2O3 dispersed solid electrolyte systems (DSES) in the temperature range of 50 �C to 300 �C and the frequency 50 KHz to 1 MHz. Dielectric constant, loss tangent, and AC conductivity, in these systems are presented. Dielectric constant, loss and AC ...

Broad-frequency dielectric behaviors of multiwalled carbon nanotubes (MWCNTs) embedded in room temperature vulcanization silicone rubber (RT-SR) matrix were studied by analyzing alternating current (ac) impedance spectra, which would make a remarkable contribution for understanding some fundamental electrical properties in the MWCNT/RT-SR nanocomposites. ...

In this paper, the bias stress effect (BSE) in organic field-effect transistors has been analyzed by an alternative experimental approach based on ac admittance (Y=G+j?C) measurements. conductance (C) and capacitance (G) curves have been recorded as a function of frequency at different times of the bias stress experiments and simultaneously fitted through ...

The paper presents a review of works on the synthesis, structural composition effects, phase transitions, and electrical conductivity properties of multicomponent solid solutions based on heterosubstituted lanthanum gallate (La,A)(Ga,M)O3 ? y . High-temperature phase transitions and structural and charge ordering effects were studied. The presence of iron ...

The AC electrical conductivity and dielectric relaxation of Ge30Sb10S60 chalcogenide glasses thin films in the frequency range 100Hz-100kHz and in the temperature span 290-450K are reported for the first time. The DC conductivity and thermoelectric power of such system are also measured. From the DC data, a presence of a wide range of ...

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 materials: ...

Ocean color algorithms are based on the parameterization of apparent optical properties as a function of inherent optical properties. WET Labs underwater absorption and attenuation meters (ac-9 and ac-s) measure both the spectral beam attenuation (c (lamb...

Thin Bis-(dimethylglyoximato)nickel(II) [Ni(DMG)2] films of amorphous and crystalline structures were prepared by vacuum deposition on Si (P) substrates. The films were characterised by X-ray fluorescence and X-ray diffraction. The constructed Al/Ni(DMG)2/Si(P) metal-insulator-semiconductor devices were characterised by the measurement of the gate-voltage dependence of their capacitance and ...

The ac impedance spectra of polymer electrolyte fuel cell (PEFC) cathodes measured under various experimental conditions are analyzed. The measurements were carried out in the presence of large dc currents. The impedance spectrum of the air cathode is shown to contain two features: a higher frequency loop or arc determined by interfacial charge-transfer resistance and catalyst ...

We analyze the scaling properties of the ac conductivity spectra of ion-conducting polyelectrolyte complexes of different compositions. Spectra were taken at ambient temperature but at different relative humidities. For the first time, we report on a scaling principle for conductivity spectra ...

We analyze the scaling properties of the ac conductivity spectra of ion-conducting polyelectrolyte complexes of different compositions. Spectra were taken at ambient temperature but at different relative humidities. For the first time, we report on a scaling principle for conductivity spectra ...

We investigate transport properties of molecular junctions under two types of bias--a short time pulse or an ac bias--by combining a solution for Green's functions in the time domain with electronic structure information coming from ab initio density functional calculations. We find that the short time response depends on lead structure, bias voltage, and ...

We investigate transport properties of molecular junctions under two types of bias-a short time pulse or an ac bias-by combining a solution for Green's functions in the time domain with electronic structure information coming from ab initio density functional calculations. We find that the short time response depends on lead structure, bias voltage, and ...

This paper presents the influences of the utilization of steel slag as a coarse aggregate on the properties of hot mix asphalt. Four different asphalt mixtures containing two types of asphalt cement (AC-5; AC-10) and coarse aggregate (limestone; steel slag) were used to prepare Marshall specimens and to determine optimum bitumen ...

Considering the electrical conductivity in ceramics, necessary reference should be given to dynamic processes occurring as a function of frequency and temperature. Although the most immediate interest in ferrites lies in their magnetic properties, technological applications require a wider knowledge of general physical properties as ...

... Title : EFFECT OF TEMPERING ON NOTCH PROPERTIES OF D6AC ALLOY STEEL SHEET. Descriptive Note : Technical rept.,. ...

In alternating electric (AC) fields, particles experience polarizing effects that induce dipoles that orient elongated specimens either parallel or perpendicular to the field lines. In this work we studied the behavior of photoreceptor cells' rod outer segments (ROS) in AC fields of different frequencies. We showed that at low frequencies, ROS orient ...

The chemical diffusion coefficient and the ionic conductivity of the fast mixed conductor {alpha}{prime}-AG{sub 2+{delta}}Te have been measured with high stoichiometric resolution at 160 and 200 C within the range of homogeneity by applying both ac and dc methods. All measurements were performed on the same symmetric electrochemical cell. The stoichiometry ...

The anisotropy of the dynamic properties of interlayer water molecules along the a and b axes of vanadium pentoxide hydrate, orthorhombic V2O5.nH2O, was studied using quasielastic neutron scattering (QENS) in relation to the anisotropy of the ac conductivity. The QENS spectra were analyzed using a stretched exponential function and a ...

Iron phosphate glasses are of interest for immobilizing high level nuclear waste (HLW). The high temperature viscosity and AC electrical conductivity of an iron phosphate melt containing 2.8 mass% chrome oxide were investigated in this work. The viscosity of this melt varied from 10 to 50 poise from 1350 to 1150 �C, respectively, while the activation ...

Se0.9In0.1 samples were prepared from their highly pure constituents, by ice-water quenching from the melts. Structural characterization using XRD and DTA has revealed a stable phase consisting of some crystalline clusters embedded in a glassy matrix with a single glass transition (Tg) at a temperature 320 K, an onset exothermic crystallization peak at 361 K, and a melting endotherm with a melting ...

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...

Transport properties of polyaniline (PANI)-cellulose acetate (CA) conducting blends have been investigated at various length scales and temperatures. We report on the results of dc and ac conductivity measurements, magnetoresistance and electron-spin resonance (ESR) performed on composite films with PANI weight ...

Electrical properties of Cu/a-BaTiO3/Cu capacitors have been investigated in both dc and ac regimes as a function of temperature. A clear correlation is found between the temperature dependence of dc leakage currents and the temperature variation of the dielectric relaxation, showing that these measurement techniques are probing the same defects. Using ...

This paper compares the current density (J) versus applied bias (V) of self-assembled monolayers (SAMs) of three different ethynylthiophenol-functionalized anthracene derivatives of approximately the same thickness with linear-conjugation (AC), cross-conjugation (AQ), and broken-conjugation (AH) using liquid eutectic Ga-In (EGaIn) supporting a native skin (~1 nm thick) of ...

This report describes work concerning the properties of the high- temperature oxide superconductors. This work falls into four general areas: ac losses in the superconducting state, ac losses in the normal state, anisotropy in the superconducting state, and monitoring developments in high-temperature superconductivity. General ...

Electrode polarization is a major problem in the determination of dielectric properties of samples, particularly at low frequencies. Understanding of these interfacial phenomena is essential in order to measure correctly the electrical properties of a sample of interest. This paper presents a comparative study of the effect of electrode contact impedance ...

We have measured the thermal conductivity ?, the resistivity, and the AC susceptibility of Bi2Sr2CaCu2Ox single crystals. The zero resistivity transition temperature varies from 93 to 95 K for different samples. Weak temperature dependence and absolute value of ? of our crystals in the temperature interval 10 K

xAgI-(1-x) LiPO3 composite glasses were made by quenching of molten mixture. XRD confirms that ?-AgI is stabilized in LiPO3 glass matrix. A room temperature conductivity of ~10-3 S/cm is achieved in the composite glass. The ac conductivity follows Jonscher power law (JPL). Higher composition samples also obey time temperature ...

' and tan 6 decrease as Ni-ion substitution increases. The parameters n and B for the AC electrical on the parameters n and B for the electrical conductivity a2(w) is represented in Figure 6. Both n and B decrease~+ and Fe3+ ions at B-sites. The parameters n and B for electrical conductivity a2(w) were found

Electric fields induce forces at the interface between liquids with different electrical properties (conductivity and/or permittivity). We explore how to use these forces for manipulating two coflowing streams of liquids in a microchannel. A microelectrode array is fabricated at the bottom of the channel and one of the two liquids is labelled with a ...

We report on the observation of Meyer-Neldel rule in glassy Se75 Ge20 Ag5 alloy where ?E is varied by two different methods. In the first approach, the intensity of light varies while measuring the photoconductivity in amorphous thin films of Se75 Ge20Ag5 instead of changing composition of the glassy system. In the second approach, the variation of ac ...

Cr-doped Ni�Zn ferrite nanoparticles having the general formula Ni0.5Zn0.5CrxFe2?xO4 (x=0.1, 0.3, 0.5) were prepared by the simplified sol�gel method. The structural and dielectric properties of the samples sintered at 750�5 �C were studied. X-ray diffraction (XRD) patterns confirm the single-phase spinel structure of the prepared samples. The crystallite size ...

Nickel-aluminum ferrite system NiAlxFe2?xO4 has been synthesized by wet chemical co-precipitation method. The samples were studied by means of X-ray diffraction, d.c. electrical resistivity, a.c. electrical resistivity, a.c. conductivity and switching properties. The XRD patterns confirm the cubic spinel structure ...

In the present paper we report on the specific features of the dielectric properties of a MnZn ferrite/Al based composite. Previously, it has been shown that high-frequency magnetic losses in such hybrid composites (HCs) can be enhanced due to the formation of a core-shell-like structure of a composite, in which ferrite particles are immersed into a ...

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...

corrosion protection for D6AC steel, and that all chemical properties of grease ... The Igniter Adapter is fabricated of D6AC steel and heat treated per ...

... observed with the Ladish D6AC, Type 300M, and Vascojet 1000 alloy steels in the ... 3 Mechanical Properties of Ladish D6AC Test Specimens 4 ...

... The crack growth properties of D6ac steel were determined and actual components constructed of D6ac and 4340 were fatigue tested. ...

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 ...

Samples of AgPO3 were prepared from analar oxides (BDH) using standard sintering ceramic technique. The effect of UV Nd:YAG pulsed laser irradiation with wavelength of 355 nm on the transport properties of the prepared glassy samples AgPO3 was studied. The frequency and temperature dependences of the A.C. conductivity and dielectric ...

New solid electrolytes in the Fe/sub 2/O/sub 3/-TiO/sub 2/-Na/sub 2/O system with high sodium-ion conductivity were synthesized and their electrical properties, phase composition, and structural defects studied. The electrolytes were found to be solid solutions on the basis of NaFeO/sub 2/. The main reason for their high conductivity ...

The electrical conductivity of heterojunctions of amorphous carbon (a-C) films (25 and 75 nm thick) grown on silicon by magnetron sputtering has been studied as a function of the applied electric field and temperature. At low electric fields and high temperatures, the conductivity exhibits thermally activated ohmic behaviour with ...

Mixtures of accreted water, ammonia, and methane at high pressures and temperatures are thought to be major components of the giant planets such as Uranus and Neptune. The pressures and temperatures in their deep interiors can reach several Mbar and several thousands Kelvin, conditions corresponding to the fluid phase. At such extreme interior conditions it is expected that these molecules react ...

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 ...

Composite nanofibers from poly(methylmethacrylate)- (PMMA-) conducting polyaniline [PANI(HCl)] were prepared by using the electrospinning technique. The morphology and structural details of the fibers were characterized by SEM and the ac conductivity of the composite fibers found was measured to be ~ 2.17�10-4 S/cm which is very good ...

A number of approaches to the determination of water content of soil use a dielectric permittivity measurement, which is accurate but involves expensive and complex devices. We explore the use of indium tin oxide, a wide-band gap semiconductor with high conductivity, long-term stability, and low cost, to build a cheap sensor of low humidity values for automatic irrigation ...

Polycrystalline ferrites with general formula Co0.5CdxFe2.5-xO4 (0.0?x?0.5) were prepared by sol gel method. The dielectric properties ??, ??, loss tangent tan ? and ac conductivity ?ac have been studied as a function of frequency, temperature and composition. The experimental results indicate that ??, ??, tan ? ...

The electrical properties of single crystals of yttria-stabilized zirconia [(ZrO2)0.88-(Y2O3)0.12], known to be an essentially anionic conductor, are studied in wide ranges of temperature (400-1100 K) and frequency (1.6 Hz-100 kHz). The dc electrical conductivity is temperature activated, and the activation energy changes continuously from 1.17 to 1.33 eV ...

We investigated the electrical properties of nanocomposites made of epoxy resin filled with 70-nm-sized silver particles. These composites were studied for the fabrication of integrated capacitors in electronics packaging. The dc conductivity was studied as a function of the filler concentration and as a function of temperature. We also studied the ...

In this investigation, the effect of Zr substitution at the Ti site of the CaCu3Ti4O12 on the electrical properties has been studied. Samples with composition x = 0.00, 0.10 and 0.30 have been synthesized by the solid state ceramic route in the system CaCu3Ti4-xZrxO12. Powder x-ray diffraction data showed the formation of a single phase solid solution. The structure remains ...

The effects of the molar mass of polymethylmethacrylate (PMMA) on electrical, structural and morphological properties of conductive polyaniline-polymethylmethacrylate blends have been studied. We have plasticized the PMMA matrix by using dioctyl phthalate (DioPh). Three different molar masses of PMMA, 15 000, 120 000 and 350 000 g mol-1, have been used. ...

Electrical properties of polyethylene terephthalate (PET), irradiated with gamma rays, have been investigated. The PET films were irradiated with high gamma dose levels in the range from 100 to 2000 kGy. The changes in the DC (?DC) and the ac (?ac) conductivities, with the dose, have been performed. The effect of ...

This paper presents properties and nanocrystallization characteristics of HITPERM based Fe68.8Co17.2Hf7Cu1B6 and Fe69.6Co17.4Hf7B6 alloys. Both alloys differing only in copper content were subjected to series of characterizations in order to study the effect of copper. Evolution of magnetic properties as a function time has been investigated by isothermal ...

KF doped ice single crystals were grown between platinum electrodes from water of about 5 M? cm resistivity and their electrical ac conductance Gac and capacitance C measured over a temperature range of -10 to -90 �C and a frequency range of 50 to 20�103 Hz using a Wayne-Kerr B 641 ac bridge. The activation energy E? for ...

The anisotropy in unsaturated hydraulic conductivity is saturation-dependent. Accurate characterization of soil anisotropy is very important in simulating flow and contaminants (e.g., radioactive nuclides in Hanford) transport. A recently proposed tensorial connectivity-tortuosity (TCT) concept describes the hydraulic conductivity tensor of the unsaturated ...

An extensive survey of the experimental literature on ac conductivity and on the dielectric dispersion in glasses is reported. Research is focused on the region where sigma = A(omega to the s power), s approximately equal to 1. The various materials seem ...

First, it is shown how an expression for the ac conductivity of an ionically conducting material derived by Almond and West and co-workers from an earlier universal dielectric response equation of Jonscher may be related to and subsumed under a response f...

Results are given for the permeability, conductivity, and dielectric constant of a multifilament superconductor, treated as an anisotropic state of matter. The calculations are made for the limiting cases of strong and weak ac magnetic fields compared with the field required for complete penetration of the filaments. General expressions are given ...

It is shown that the basic integral for computing the a-c conductivity of a weakly ionized mixture of gases is reducible to tabulated functions if the collision frequency of electrons and gas molecules is representable by a finite series as a function of velocity. (C.E.S.)

... Accession Number : ADD250533. Title : AC Conduction Through MIM Sandwich Samples of Evaporated Thin Films of V2O5 and V2O5/B2O3. ...

Single wall carbon nanotube (SWNT) networks of different loadings were measured by impedance spectroscopy. The resistances of the junctions and bundles have been separated by modeling ac impedance spectroscopy data to an equivalent circuit of two parallel resistance-capacitance elements in series. The junction resistance was found to be 3-3.5 times higher than the bundle ...

Modulated or AC calorimetry is a well established technique for measuring the temperature dependence of the heat capacity of many complex fluids. Employing a dielectric or RF heating method, the heat capacity, thermal conductivity, and the dielectric properties of the sample are all probed simultaneously. Combining the results obtained ...

We present a new application of a hot wire sensor for simultaneous and independent measurement of thermal conductivity k and diffusivity ? of (nano)fluids, based on a hot wire thermal probe with ac excitation and 3 ? lock-in detection. The theoretical modeling of imaginary part of the signal yields the k value while the phase yields the ? value. Due to ...

... PROPERTIES, TENSILE STRENGTH, ELECTRICAL PROPERTIES, ELECTRICAL CONDUCTIVITY, THERMAL EXPANSION, THERMAL ...

... TRANSPORT PROPERTIES, THERMAL CONDUCTIVITY, ELECTRICAL CONDUCTIVITY, HYDROGEN, NITROGEN, ARGON, WEST GERMANY. ...

measure the dynamical conductance of electrically contacted single-walled carbon nanotubes at dc and ac between the ac conductance and dc conductance. We also measure the microwave conductance of 2 nanotubes measured the dynamical conductivity of ...

electroosmosis, they also become a dipole. The higher the frequency for AC, the less time there is for the charge to move. Thus K decreases with increasing ...

... A piezoelectric material is formed from conductively anisotropic crystals by exposing the crystals to an AC electrical field, cold-pressing the crystals ...

... Title : Measurement of Battery Separator Resistances in Low Impedance Conductivity Cells by AC Bridge Techniques. ...

... to the area of lightweight portable battery chargers. Several battery charging methods are described ... ac conduction angle controlled charger is made ...

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

... Descriptors : *POLYMERIC FILMS, *PYRROLES, *CAPACITANCE, *THIN FILMS, ALTERNATING CURRENT, MICROSCOPY, HIGH ENERGY ...

The ac electrical properties of evaporated cadmium telluride thin films sandwiched between ohmic aluminum electrodes have been investigated for temperatures of approximately 200 - 400 K over the frequency range 102 - 2 multiplied by 104 Hz. The ac conductivity (sigma) ((omega) ) was found to follow a (sigma) ...

Research in nanoparticle-reinforced composites is predicated by the promise for exceptional properties. However, to date the performance of nanocomposites has not reached its potential due to processing challenges such as inadequate dispersion and patterning of nanoparticles, and poor bonding and weak interfaces. The main objective of this dissertation is to improve the ...

In this study, 4,4',4''-[benzene-1,3,5-tryltris(oxy)]tri-9,10,16,17,23,24-hexa(hexylthio)phthalocyaninatocobalt(II) has been synthesized from 4-[3,5-bis(3,4-dicyanophenoxy)phenoxy]phthalonitrile and 4,5-bishexylthiophthalonitrile with CoCl2.6H2O in ethylene glycol at 170-180�C for 6 hours. The effects of substrate temperature (during coating of the films) on the electrical characteristics were ...

Indium tin oxide (ITO) substrates have been functionalized by several substituted calix[n]arene (n = 5 or 9) derivatives using spin coating to fabricate organic diode devices. The effect of rim size and side substituents has been investigated by UV-visible absorption spectrophotometry. The energy band gaps of these calixarene derivative thin films have been found in the 1.166-1.450 eV range. The ...

An approach for scaling the ac conductivity in ion-conducting glasses was recently demonstrated. Here we demonstrate that this proposed scaling can be applied to the corresponding ac permittivity and thus leads to a complete description of the scaling of both the real and imaginary components of the dielectric ...

Scaling of physical quantities describing the ac response is a common feature of disordered matter, while in some cases, empirical functions have been proposed. The exact forms of analytic functions that scale complex conductivity and permittivity are derived in this work by exploring the effect of pressure at various temperatures on the ...

The intrinsically conducting polymer, polyaniline (PANI) has been synthesized by chemical polymerization process with the help of water-soluble support polymer acrylamide (AAm). The dielectric measurement of PANI-PAAm was measured in the temperature range from 303-393 K at frequency 10 kHz. The temperature dependent data has been analyzed in the framework of dielectric ...

The double perovskite oxide holmium copper zirconate, Ho2CuZrO6 (HCZ), was synthesized by a solid-state reaction technique. The crystal structure of HCZ shows a monoclinic phase. The dielectric relaxation of HCZ was investigated in the frequency range 44 Hz�1 MHz and in the temperature range 40�360 �C by using impedance spectroscopy. The complex impedance data were analysed by the ...