NOPR Collection:

Influence of intake port design on diesel engine air motion characteristics

Thu, 01 Apr 1999 00:00:00 GMT

Title: Influence of intake port design on diesel engine air motion characteristics Authors: Raghu, M; Mehta, Pramod S Abstract: The intake system has a major influence on the performance of diesel engines. In this work, the performance of intake system, for both directed and helical port, is carried out based on a mean flow consideration. A quasi-steady emptying- filling method has been used in the present analysis to estimate the instantaneous mass flow rate for evaluation of intake swirl. The model validation for both directed and helical ports is carried out using available experimental data in literature. A detailed parametric study has been presented to highlight the role of such an analysis in intake port design and evaluation for required air motion characteristics. Page(s): 53-58

Synthesis and magnetic properties of 3D-metal oxalate networks as molecular-based magnets

Thu, 01 Apr 1999 00:00:00 GMT

Title: Synthesis and magnetic properties of 3D-metal oxalate networks as molecular-based magnets Authors: Singh, B P; Singh, B; Singh, R A; Delhaes, P Abstract: The reaction of oxalic acid, metal(II) salt and tetra(n-butyl) ammonium bromide or dimethyl dioctadecyl ammonium bromide in a molar ratio of 1.5:1:1 in water or ethanol-water at room temperature afforded polymetallic assemblies with the Formulae{ (NBu₄)[M₂(OX)₃]}_× [M = Mn²⁺(1), Fe²⁺(2), Co²⁺(3)] and {(DMDOA)₂[M₂(OX)₃]}_× [M = Mn²⁺(4), Fe²⁺(5),Co²⁺ (6)]. The magnetic susceptilbility data of 5 and 6 in the range 20 K < T < 300 K obey the Curie-Weiss law and on lowering the temperature the effective magnetic moment decreases gradually and reveals anti ferromagnetic phase transition. They have also been characterized by FAB mass, IR, electronic and ESR spectra. Page(s): 100-106

Designing of a low cost potentiostat

Thu, 01 Apr 1999 00:00:00 GMT

Title: Designing of a low cost potentiostat Authors: Gupta, A N; Rohella, R S Abstract: A low cost solid state potentiostat circuit has been designed. The circuit can provide ± 12.5 V voltage output across the working electrode (WE) and countrer electrode (CE) and shows no oscillations in this output range. Within the output limits of ± 12.5 V, control voltage of ± 2.0 V can be set between the working electrode and reference electrode (RE) which is the normal working range in most of the electrochemical studies. Page(s): 63-65

Thermal expansion coefficient of XH₂PO₄-H₃BO₃ [X = Na, K and (NH₄)] mixed crystals around 310 - 340 K

Thu, 01 Apr 1999 00:00:00 GMT

Title: Thermal expansion coefficient of XH₂PO₄-H₃BO₃ [X = Na, K and (NH₄)] mixed crystals around 310 - 340 K Authors: Mohan, M L N Madhu Abstract: The measurement of thermal expansion coefficient (α) of XH₂PO₄-H₃BO₃ binary [where X = Na, K and (NH₄)] is described around 310-340 K using an interferometric technique. The design and fabrication of this method along with the relative advantages over other methods are also discussed. Page(s): 107-110

NOPR Collection:

Influence of intake port design on diesel engine air motion characteristics

Synthesis and magnetic properties of 3D-metal oxalate networks as molecular-based magnets

Designing of a low cost potentiostat

Thermal expansion coefficient of XH2PO4-H3BO3 [X = Na, K and (NH4)] mixed crystals around 310 - 340 K

Thermal expansion coefficient of XH₂PO₄-H₃BO₃ [X = Na, K and (NH₄)] mixed crystals around 310 - 340 K