Abstract: A control circuit for a piezo transformer based power supply for a fluorescent lamp includes driver circuitry generating pulse waveforms for providing excitation to primary inputs of the piezo transformer, and circuitry for regulating lamp current and the voltage across the piezo transformer primary inputs. The frequency of the pulse waveforms is varied in response to the magnitude of lamp current to maintain a predetermined desired lamp current as represented by a current reference signal. The duty cycle of the driver circuitry is varied in response to the magnitude of the voltage across the piezo transformer primary inputs to maintain a predetermined desired piezo primary voltage as represented by a voltage reference signal. The piezo transformer is operated as close to resonance as possible, contributing to greater circuit efficiency. The driver circuitry in the control circuit employs four transistors arranged as a full bridge with respect to the piezo transformer primary inputs.

Abstract: Non-stoichiometric, heterogeneous, amorphous catalysts for preparing esters of acrylic and methacrylic acids.

Abstract: Synthesis of organic amines by condensation of organic hydroxy compound with ammonia or a primary or secondary amine in the presence of a rare earth metal hydrogen phosphate catalyst.

Abstract: Acid Phosphates are used, in either the gas or liquid phase, to catalyze the alkylation of phenols by an alcohol to selectively form alkyl aryl ethers.

Abstract: Certain hydrogen phosphate and pyrophosphate compositions are employed as catalysts for organic condensation reactions. Particularly high conversions and selectivities are obtained by the use of synergistic mixtures of in cyclization reactions such as in the conversion of hydroxyethylpiperazine to triethylenediamine and morpholine to dimethylaminoethylmorpholine.

Abstract: Strontium pyro-, monohydrogen, and dihydrogen phosphates are employed as catalysts for acid catalyzed organic condensation reactions. High conversion and exceptionally high selectivity are obtained by use of such catalysts in cyclization reactions such as in the conversion of hydroxyethylpiperazine to triethylenediamine.

Abstract: Certain hydrogen phosphate and pyrophosphate compositions are employed as catalysts for organic condensation reactions. Specifically, a diethylene glycolamine compound is converted to a morpholine compound in the presence of such a catalyst.

Abstract: Certain hydrogen phosphate and pyrophosphate compositions are employed as catalysts for organic condensation reactions. Specifically, a diglycolamine compound is converted to a morpholine compound in the presence of such a catalyst.

Abstract: Strontium diorthophosphate is employed as catalyst for acid catalyzed organic condensation reactions. High conversion and exceptionally high selectivity are obtained by use of strontium diorthophosphate in cyclization reactions such as in the conversion of hydroxyethylpiperazine to triethylenediamine.