Temperature Dependence of the Dielectric Properties of Rubber Wood

The effect of temperature on the dielectric properties of rubber wood were investigated in three anisotropic directions-longitudinal, radial, and tangential, and at different measurement frequencies. Low frequency measurements were conducted with a dielectric spectrometer, and high frequencies used microwave applied with open-ended coaxial probe sensors. Dielectric constants and dielectric loss factors were measured at temperatures from 25 to 100°C. A large dielectric dispersion occurred at frequencies less than 10 Hz and at temperatures more than 60°C. The minimum peak value of the dielectric loss factors shifted towards higher frequencies at higher temperatures in all three grain directions. The tangential direction showed the highest activation energy. The dielectric constant decreased as frequency increased from 1 to 10 GHz, and thereafter remained unchanged with additional frequency increases. The dielectric constant exhibited higher values at higher temperatures. The dielectric loss factor showed a peak value at around 10 GHz at 25°C

Elastic Behavior of Borate Glasses Containing Lead and Bismuth Oxides

binary borate glasses with different compositions, (MO) (B 2 O 3 ) 1− (M = Pb, Bi), have been characterized and ultrasonic velocity as well as density is taken into account. In addition, the results have been compared with those of Ag, K, and Li oxide borate glasses from others. The ultrasonic velocities (both longitudinal and transverse) and density for (PbO) (B 2 O 3 ) 1− and (Bi 2 O 3 ) (B 2 O 3 ) 1− have been measured accurately and elastic moduli as well as hardness and Poisson's ratio was determined. It has been demonstrated that density and ultrasonic velocities are enhanced by increasing PbO and Bi 2 O 3 molar fraction with different values for each borate glass composition. However, the enhancement of ultrasonic velocities did not carry on continuously and after reaching a maximum point, they fell down dramatically. Both PbO and Bi 2 O 3 showed almost similar glass improvement in case of density, ultrasonic velocity, and elastic moduli

Perceived critical success factors of electronic health record system implementation in a dental clinic context: An organisational management perspective

Background Electronic health records (EHR) make health care more efficient. They improve the quality of care by making patients’ medical history more accessible. However, little is known about the factors contributing to the successful EHR implementation in dental clinics. Objectives This article aims to identify the perceived critical success factors of EHR system implementation in a dental clinic context. Methods We used Grounded Theory to analyse data collected in the context of Brunei’s national EHR − the Healthcare Information and Management System (Bru-HIMS). Data analysis followed the stages of open, axial and selective coding. Results Six perceived critical success factors emerged: usability of the system, emergent behaviours, requirements analysis, training, change management, and project organisation. The study identified a mismatch between end-users and product owner/vendor perspectives. Discussion Workflow changes were significant challenges to clinicians’ confident use, particularly as the system offered limited modularity and configurability. Recommendations are made for all the parties involved in healthcare information systems implementation to manage the change process by agreeing system goals and functionalities through wider consensual debate, and participated supporting strategies realised through common commitment

Elastic Behavior of Borate Glasses Containing Lead and Bismuth Oxides

PbO and Bi2O3 binary borate glasses with different compositions, (MO)X(B2O3)1−X (M = Pb, Bi), have been characterized and ultrasonic velocity as well as density is taken into account. In addition, the results have been compared with those of Ag, K, and Li oxide borate glasses from others. The ultrasonic velocities (both longitudinal and transverse) and density for (PbO)X(B2O3)1−X and (Bi2O3)X(B2O3)1−X have been measured accurately and elastic moduli as well as hardness and Poisson’s ratio was determined. It has been demonstrated that density and ultrasonic velocities are enhanced by increasing PbO and Bi2O3 molar fraction with different values for each borate glass composition. However, the enhancement of ultrasonic velocities did not carry on continuously and after reaching a maximum point, they fell down dramatically. Both PbO and Bi2O3 showed almost similar glass improvement in case of density, ultrasonic velocity, and elastic moduli

Effect of Concurrent ZnO Addition and AlF3 Reduction on the Elastic Properties of Tellurite Based Glass System

New ternary zinc oxyfluorotellurite (ZOFT) with the composition (ZnO)x-(AlF3)y-(TeO2)z, where 5≤x<35; 5≤y≤25; 60≤z≤70, has been successfully prepared by the conventional rapid melt quenching technique. Density, molar volume, and glass transition temperature have been assessed for each ZOFT glass sample. The longitudinal and transverse ultrasonic waves propagated in each glass sample were measured using a MBS8020 ultrasonic data acquisition system at 5 MHz frequency and room temperature. The longitudinal modulus (L), shear modulus (G), Young’s modulus (E), bulk modulus (K), and Poisson’s ratio (σ) are assessed from both velocity data and their respective density. The compositional dependence of the ultrasonic velocities and related parameters are discussed to understand the rigidity and compactness of the glass system studied

The Effect of Remelting on the Physical Properties of Borotellurite Glass Doped with Manganese

A systematic set of borotellurite glasses doped with manganese (1–x) [(B2O3)0.3(TeO2)0.7]-xMnO, with x = 0.1, 0.2, 0.3 and 0.4 mol%, were successfully synthesized by using a conventional melt and quench-casting technique. In this study, the remelting effect of the glass samples on their microstructure was investigated through density measurement and FT-IR spectra and evaluated by XRD techniques. Initial experimental results from XRD evaluation show that there are two distinct phases of glassy and crystallite microstructure due to the existence of peaks in the sample. The different physical behaviors of the studied glasses were closely related to the concentration of manganese in each phase. FTIR spectra revealed that the addition of manganese oxide contributes the transformation of TeO4 trigonal bipyramids with bridging oxygen (BO) to TeO3 trigonal pyramids with non-bridging oxygen (NBO)

Correction: Effect of AlF3 on the Density and Elastic Properties of Zinc Tellurite Glass Systems. Materials 2012, 5, 1361-1372.

Due to an oversight, the data of the last column “Vs” in Table 1 was missing in the original version of this article [1]. [...

Effect of AlF&lt;sub&gt;3&lt;/sub&gt; on the Density and Elastic Properties of Zinc Tellurite Glass Systems

This paper presents the results of the physical and elastic properties of the ternary zinc oxyfluoro tellurite glass system. Systematic series of glasses (AlF&lt;sub&gt;3&lt;/sub&gt;)&lt;sub&gt;x&lt;/sub&gt;(ZnO)&lt;sub&gt;y&lt;/sub&gt;(TeO&lt;sub&gt;2&lt;/sub&gt;)&lt;sub&gt;z &lt;/sub&gt;with x = 0–19, y = 0–20 and z = 80, 85, 90 mol% were synthesized by the conventional rapid melt quenching technique. The composition dependence of the physical, mainly density and molar volume, and elastic properties is discussed in term of the AlF&lt;sub&gt;3&lt;/sub&gt; modifiers addition that are expected to produce quite substantial changes in their physical properties. The absence of any crystalline peaks in the X-ray diffraction (XRD) patterns of the present glass samples indicates the amorphous nature. The addition of AlF&lt;sub&gt;3&lt;/sub&gt; lowered the values of the densities in ternary oxyfluorotellurite glass systems. The longitudinal and transverse ultrasonic waves propagated in each glass sample were measured using a MBS8020 ultrasonic data acquisition system. All the velocity data were taken at 5 MHz frequency and room temperature. The longitudinal modulus (L), shear modulus (G), Young’s modulus (E), bulk modulus (K) and Poisson’s ratio () are obtained from both velocities data and their respective density. Experimental data shows the density and elastic moduli of each AlF&lt;sub&gt;3&lt;/sub&gt;-ZnO-TeO&lt;sub&gt;2&lt;/sub&gt; series are found strongly depend upon the glass composition. The addition of AlF&lt;sub&gt;3&lt;/sub&gt; modifiers into the zinc tellurite causes substantial changes in their density, molar volume as well as their elastic properties

Features of the Formation of the Crystal Structure, Grain Structure, Dielectric and Thermophysical Properties of Bismuth Ferrite Doped with Erbium

The crystal structure and surface morphology of ceramics as well dielectric and thermal properties of Bi1&#8722;xErxFeO3 (where x = 0.05 &#8722; 0.20, &#916;х = 0.05) magnetoelectric solid solutions (SS) were investigated. The regularities of changes in phase composition, microstructure, electrical and dielectric properties of objects at room temperature are established