A nickel catalyst to be used for internal steam reforming in a molten carbonate fuel cell (MCFC) must be resistant to the alkali components (Li and K species) of the electrolyte; these components can reach the catalyst from the anode by either transport via the vapor phase or by means of surface creep along the walls. In a series of experiments for determining the rates of transport, it was fou...

The stability of two-component clusters consisting of light (Na or K) and heavy (Rb or Cs) alkali atoms formed on helium nanodroplets is studied by femtosecond laser ionization in combination with mass spectrometry. Characteristic stability patterns reflecting electron shell-closures are observed in dependence of the total number of atoms contained in the mixed clusters. Faster decay of the sta...

We describe an alkali-metal magnetometer for detection of weak magnetic fields in the radio-frequency (rf) range. High sensitivity is achieved by tuning the Zeeman resonance of alkali atoms to the rf frequency and partially suppressing spin-exchange collisions in the alkali-metal vapor. We demonstrate magnetic field sensitivity of 2 fT/Hz(1/2) at a frequency of 99 kHz with a resonance width of ...

A case of the 'milk alkali syndrome' associated with grossly elevated levels of amino terminal parathyroid hormone is described. The hypercalcaemia (calcium 4.09 mmol/l) and hyperparathyroidism settled on conservative measures. Factors in the milk alkali syndrome which might stimulate the release of parathyroid hormone include parathyroid gland hyperplasia secondary to suppression of ionized ca...

Glucans were isolated from the cell wall of the yeast (Y) and mycelial (M) forms of Paracoccidioides brasiliensis. The alkali-soluble glucan of the Y form had properties of alpha-1,3-glucan. The alkali-insoluble glucan of the M form was identified as a beta-glucan which contains a beta-(1 --> 3)-glycosidic linkage by infrared absorption spectrum, by effect of beta-1,3-glucanase, and by partial ...

NMR signals of 7Li, 23Na, 35C1, 39K , 79Br, 87Rb and 127I have been measured in various alkali and halogen salt powders relative to well defined aqueous solutions. W ith the known shielding constants of some of these solutions the nuclear magnetic shielding constants of the alkali and chlorine nuclei in crystalline powders were evaluated in the atomic reference scale. The theoretical values of ...

Negative ion photoelectron spectra are reported for the heteronuclear alkali dimer and trimer anions, NaK-, KRb-, KCs-, RbCs-, Na$-, and KzCsat 488 nm. In addition to assigning all ofthe electronic transitions observed in the mixed dimer anion spectra, vertical detachment energies, adiabatic electron affmities, and dimer anion dissociation energies have also been determined. A linear correlatio...

gabal el-zeit block at the western coast of the gulf of suez region in egypt consists of two varieties of precambrian granites, namely monzogranite and a peripheral zone of alkali granite. both granitic varieties display moderate (60.1-68.5 wt%) and high silica (73.36-76.16 wt%) contents with high na2o+k2o (7.21-8.61 wt%), respectively. the investigated monzogranite is calc-alkaline metaluminou...

an airlift-type activated sludge reactor using a sponge support medium was fed with wastewater containing 500 mg-n/l of nh4 +-n. in order to establish partial nitrification, the reactor was kept at 35°c. moreover, the reactor was started up with the nahco3 solution as an alkali agent to supply inorganic carbon for enhancement of partial nitrification. the partial nitrification was established d...