Oxides of the formula Nd2Ba2CaCu2_xZnxTi3Oi4 (x = 0:0, 0.5, 1.0, 1.5, 2.0) have been successfully prepared by high temperature ceramic route at 1025 8C, as well as by the low temperature citrate precursor route at 800 8C. The copper-rich compounds obtained by the ceramic route (x = 0-1.0) are found to have a tetragonal structure, with the a and c parameters increasing with zinc substitution, fr...

The effect of thermal acclimation on cardiac thermal performance limits was examined in congeneric species of porcelain crabs (genus Petrolisthes) from temperate and subtropical habitats. In vivo heart rate was monitored using impedance electrodes during thermal ramps (0.1 8C/min) where temperature either increased or decreased from an intermediate temperature to thermal extremes. Arrhenius plo...

The microstructural evolution during age hardening of a Cu-bearing Al-Mg-Si alloy has been investigated by the three-dimensional atom probe (3DAP) and transmission electron microscope (TEM) techniques, in order to clarify the effect of Cu on the initial age-hardening response. After 30 minutes of artificial aging at 175 8C, the alloy shows a significant increase in hardness. The TEM observation...

In a time of limited reserves of fossil fuels, the problem of biogas utilization becomes a fundamental question. For example, the city of Prague in central Europe with 1.25 million inhabitants requires 35 million liters of diesel per year for its 1180 buses. Diesel is expensive and significantly increases air pollution, mainly with aromatic hydrocarbons (including naphthalenes and alkyl benzene...

A La(III)-loaded granular ceramic adsorbent, consisting mainly of different forms of metal oxide minerals, was developed for phosphorus removal from aqueous solution. Batch experiments were performed to investigate the effects of various experimental parameters, such as contact time (3–48 h), initial phosphorus concentration (5–25 mg/L), pH (2.0–12.0), temperature (20, 30 and 40 8C) and anions ...

Amorphous hydrogenated silicon carbonitride (a-SiCN:H) thin films are synthesized by atmospheric pressure plasma enhanced chemical vapor (AP-PECVD) deposition using the Surfx Atomflow 250D APPJ source with triethylsilane (HSiEt3, TES) and nitrogen as the precursor and the reactive gases, respectively. The effect of the substrate temperature (Ts) on the growth characteristics and the properties ...

The term eicosanoid is used to embrace biologically active lipid mediators (C20 fatty acids and their metabolites), including prostaglandins, thromboxanes, leukotrienes and other oxygenated derivatives, which are produced primarily by three classes of enzymes, cyclooxygenases (COX-1 and COX-2), lipoxygenases (LOX) and cytochrome P450 mono-oxygenases. The key precursor fatty acids are 8c,11c,14c...

We report on a stabilization effect on the structure and activity of Ag/Al2O3 for the selective catalytic reduction (SCR) of NOxwith CH4 imparted by the presence of SO2 in the exhaust gasmixture. The reaction is carried out at temperature above 600 8C to keep the surface partially free of sulfates. In SO2-free gases, catalyst deactivation is fast and measurable at these temperatures. Time-resol...

The warming and humidification of inspired gases for ventilated neonates are routine. There are no data on the temperature of the gasat the airway opening in ventilated neonates. Is the inspired gas temperature at the airway opening, as expected and set on the humidifier, around 378C?We aimed to measure temperature at the airway opening and compare this with the circuit temperature. This was an...