No abstract available

[en] The consumption of manganese during deoxidation of the 08ps(kp) low carbon steel is considered. Equations are suggested for forecasting the coefficient that characterizes manganese consumption cross-section, area and length of a steel-tapping hole, which are used in the calculation of the optimal amount of deoxidants

[en] Zinc borates activated with Mn²⁺ have effective luminescence when exciting in the vacuum ultraviolet radiation range. It is connected with excitation energy absorption by anions. The luminescence spectra represent themselves wide bands with λ_max = 540 nm for Zn₄O₅(BO₂)₆ - Mn²⁺ and ZnB₄O₇ - Mn²⁺, 595 nm for Zn₃(BO₃)₂ - Mn²⁺. The zink orthoborate luminescence in the yellow-range of the spectra is connected with disordered tetrahedral environment of an activator

[en] Measurements of the relative dielectric constant K, the electric dissipation factor tan δ and the electrochemical coupling factors of the thickness k_t and planar K_p vibration modes were realized in lead titanate piezoelectric ceramics, with batched composition (Pb_1-3/2xLa_x)TiO₃, 0,025 ≤ x ≤0,20. The same parameters were determined in these compositions after the addition of 1%mol of Mn. The results shown clearly that manganese increases the electrochanical anisotropy (K_t/K_p) and decreases the dielectric constant and the electric dissipation factor of these materials. (author)

[en] A measuring element comprises a metaphosphate glass doped with manganese as an activator. The manganese activated metaphosphate glass can detect and determine radiation doses in the range between milliroentgens and more than 10 megaroentgens. (auth)

[en] Nano-soldering relying on a sacrificial nanosolder, is a flexible interconnection technique, having promising applications in joining nanosized functional materials; that is an essential step in the assembly of nano-devices. In a soldering, the wettability is important in the bonding of two nanomaterial, which determines the quality of the junction. Tungsten trioxide nanomaterial has unique characteristics such as electro-, opto-, gaso-chromic. To assemble this nanomaterial into functional nano-devices, a superior nanosolder is necessary. The conventional SnCu nanosolder has been chosen, but its wetting on WO₃ is unsatisfactory. Here, our study indicates that the SnCu wettability on WO₃ material has been improved greatly by adding minor manganese, in which the contact angle has a significant change from 73.2° to 41.7°. Then the wetting mechanism is investigated by observing the soldering interface. Lastly, a more robust and higher-reliable junction has been obtained by thermal soldering two individual WO₃ nano-objects into a cross-shaped pattern. (paper)

[en] Hot cracking in welds can be divided into solidification cracking of the weld bead and liquation cracking of the heat affected zone. As an example for soldification cracking, the results of studies on fully austenitic submerged arc welding material with the help of a newly developed weld cracking test machine are introduced. The influence of increasing Mn-contents and welding speeds are reported. The explanation of the results is carried out by light-optical and SEM investigations of the middle of the weld bead. As an example for liquation cracking, investigations of the HAZ of base material in high strength construction steels with the aid of hot ductility tests are illustrated. The influence of the Mn/S-ratio on a derived cracking susceptibility factor is determined. Sulfides with low melting points in a fern-like configuration on the grain boundaries are said to cause the liquation cracking susceptibility of the material. (orig.)

[en] Important researches is being conducted in order to decrease the emissions and fuel consumption. Emissions and fuel consumption has been dramatically decreased by engine design studies. On the other hand it is difficult to obtain the desired results by engine design only. Studies are being made on fuel additives so as to improve the engine performance, combustion and emission characteristics. In this study manganese additive was added into a cotton methyl ester (C0) and accordingly combustion and emission characteristics at full load and different speed intervals were examined. In the experiments conducted for this mixture a diesel engine with single cylinder was used and the maximum power was obtained at 2750 rpm. Maximum cylinder pressure was obtained at 2200 rpm where as maximum moment was obtained in C0Mn12 fuel. At the same time heat release rate was at 0.021 kJ/oCA and maximum rate of pressure rise was found to be 6.73 bar/oCA. Minimum CO and THC emission were obtained at 2200 rpm and maximum decrease in THC emisssion occured with the C0Mn12 fuel when compared to the C0 fuel, maximum decrease in THC was found to be 5.01 %. Maximum increase in emissions when compare to C0 fuel was 11.58 % in C0Mn12 fuel at 3250 rpm while they were 33.14 % at 1750 rpm. At 2750 rpm maximum decrease of emissions in the C0Mn12 fuel was found to be 2.74 %.

No abstract available

[en] The thermoluminescence (TL) of CaF₂:Mn has been studied using photon counting and digital recording. For doses of 10 rad or less the TL glow curves appear to consist of a single glow peak. However, there are indications - which are pronounced at larger doses - that one additional low intensity peak (area less than or equal to one percent) is superimposed on each side of the central peak. The intense peak is not described by 1st or 2nd order kinetics but is well described by the more general kinetics from which these kinetics are derived. These observations, and the results of additional kinetic analysis, demonstrate that retrapping is not negligible and may include all three peaks. In such systems, which are likely to include other dosimeter materials and minerals, peak height will not increase linearly with dose; an important factor for dosimetry and dating applications