Dual phase steels with different martensite volume fraction and morphology were tensile tested at a TEMPERATURE range of 25 to 550°C. Stress-strain incurves of all steels showed serration flow at TEMPERATUREs of 250 and 350°C, and smooth flow at the other TEMPERATUREs. Both yield and ultimate tensile strengths increased with increasing testing TEMPERATURE up to about 450°C and then decreased at higher TEMPERATUREs. At a given TEMPERATURE, yield stress, tensile strength, and work hardening increased with increasing volume fraction of martensite. Similar behavior was observed by changing martensite morphology from network to fibrous martensite. The change in mechanical properties Was related to the effects of dynamic strain aging, high TEMPERATURE softening, and martensite tempering.

A mathematical model has been developed to predict the TEMPERATURE distribution in well bores either offshore or inshore. It is incorporated the different activities encountered during drilling operations Furthermore, the effect of drill collar and casings and bit rotating in a well during completion has been considered. The two dimensional approach is presented in the form ct a computer program which is adopted for solution of the finite difference equations describing the heat transmission in the well bore in the form of a direct solution technique. The power law model has been selected for drilling mud and its indices have been calculated. Comparing measured data, recorded for a period of 32 hours during different activities in a drilling operation for 15/20 A-4, an exploration well in the Central North Sea with calculated results, show there is a good agreement between the prediction and measured TEMPERATUREs in the well bore.

Background: Tympanic thermometer (TT) is convenient, non invasive and clean, but the accuracy is not still clarified. The purpose of this study was to compare the accuracy of this method with rectal method in children less than 6 years of age.Methods: In this cross-sectional study a total of 220 pair ears and rectal sites were used to determine the body TEMPERATURE in patients between 3 months to 6 years old from emergency department of Bushehr University of Medical Sciences. Rectal TEMPERATURE (RT) was as gold standard in this study. Fever was defined as 38°C.Findings: Correlation between rectal and tympanic TEMPERATURE³38oC, and TT³RT was statistically significant. The mean difference between RT and TT was 0.3°C. When cutoff point was considered 38°C for TT, the sensitivity was 46%, specificity was 97% and positive (PPV) and negative predictive values (NPV) were 92% and 72% respectively. Roc curve showed the best cutoff point for TT as 37oC, which increased the sensitivity (92%) and PPV (0.980) and decreased the specificity (90%) and NPV (0.57). Kappa test showed a good agreement rate between RT and TT. Age had significant effects on the TT/RT relationship.Conclusion: Sensitivity and NPV (when cutoff point was 38°C for TT) were unacceptably low. If TT is used in a cutoff point as 37°C, the sensitivity and NPV would improve and TT can be used as a safe, easy, rapid and accurate method in pediatrics.

The resistivity (r) data for RFeAsO compounds (R=Ce, Pr, Nd, Sm), in the TEMPERATURE (T) range 35–315 K have been analyzed to identify the dominant scattering mechanisms. Close to the room TEMPERATURE, the system appears to be a metal with low electron density, and the electron–phonon scattering is the dominant one. At lower TEMPERATUREs, electron–electron scattering plays an important role. In an intermediate TEMPERATURE region, unlike metallic system, dr/dT is negative; and r-1 varies as lnT as in a state of weak localization. We look into the origin of negative dr/dT. The analysis of r (T) data below the SDW transition TEMPERATURE shows the presence of electron–electron interaction in addition to a SDW energy gap, and also gives an estimate of the SDW energy gap.

A simple semi-phenomenological model, which accurately predicts the dependence of threshold current for TEMPERATURE of Resonant-phonon three well quantum cascade laser based on vertical transitions is offered. We found that, the longitude optical phonon scattering of thermally excited electrons is the most important limiting factor for thermal performance of high frequency THz QCLs. In low frequency region, parasitic current increases the threshold current. Based on our model the use of materials with higher longitude optical phonon energy such as InGaAs/GaAsSb and decreasing the lower laser level lifetime can increase the maximum performance TEMPERATURE. Our observations may can be used to understand the notion of the effects of thermal electrons on reduction of laser performance.