Considerations Regarding Validation through Simulation of Some Board System Information’s for Powertrain Performance Optimization

The authors present in this paper the opportunities offered by the use of software platforms (MULTISIM) in the validation of informational systems for optimizing economical consumption. So after some research (based on identification methodology system type) a physical-mathematical model can be developed that offers the possibility to optimize fuel consumption in the economy pole depending on specific correlations of operating regimes. Resulted relationships allow designing of information systems by proposing solutions which acquire information on movement speed, engine RPM in load (by determining the actual torque through correlations of exhaust gas temperature, moment and torque).Having these relationships we can design, for example, system version with discrete components or with digital system for surveillance engine operation.

Seasonal Load Response Behavior of a Thin Portland Cement Concrete Pavement

The mechanistic-empirical pavement design methods currently under development have demonstrated a need for seasonal material and load response behavior characterization. The seasonal dynamic load strain response of a thin [5-in. (127-mm)], low-cost, portland cement concrete pavement at the Minnesota Road Research Project was examined. Environmental and load-related factors to be considered in this type of study are described. For the truck speeds used, analysis found minimal effects on measured dynamic strain. Nonlinear temperature profiles in the slabs prompted the use of the temperature-moment concept in the analysis. For the approach side of the joint in the slabs, during periods with unfrozen base and subgrade layers, there is only a small increase in the dynamic strain response with decreasing temperature-moment. Average dynamic strain responses range from 50 to 80 microstrain, with little difference in magnitude between the 80,000-lb (355-kN) and 102,000-lb (453-kN) loadings. For the leave side of the joints in the slabs, there is a larger increase in dynamic strain response with decreasing temperature-moment. In addition, the 102,000-lb load response is nearly 60% larger than the 80,000-lb load response for large negative temperature-moments. Recommendations for improving dynamic load testing of pavements are given.

Crystal Structure and Magnetic Susceptibility of Ce8Pd24Sb

The ternary compound Ce8Pd24Sb is very close in composition to the intermediate valent binary CePd3. A single crystal study yielded a cubic cell with a = 8.461 (1)Å, Pm3̄m symmetry with wR2 = 0.0412 based on 1453 reflections (222 unique) and 16 parameters. This new structure type is composed of distorted perovskite and Cu3Au subcells arranged with the perovskite-like units centred on the corners of the cube. Fitting the magnetic susceptibility data above 100K to a Curie-Weiss expression yielded a Weiss constant of -15(3)K (antiferromagnetic) and an effective high temperature moment per cerium of 2.45(4)/μв indicating trivalent cerium. No ordering was observerd above 3K.

Bivalent cobalt complexes of 2,4,6-Tri(2'-pyridyl)-1,3,5-triazine

This paper reports the isolation of a series of new coordination compounds formed with the terdentate ligand 2,4,6-tri(2?-pyridyl)- 1,3,5-triazine (tpt) and various bivalent cobalt salts. The stereochemistries of these compounds are proposed after consideration of their elementary analyses, visible solid and solution spectra, infrared spectra, magnetic moments, and thermogravimetric studies. ��� The chelates obtained include octahedral bis-complexes of the type [Co tpt2]X2 (where X = Cl, Br, I, CNS, ClO4, NO3, BF4, or BPh4) and five- coordinate mono-complexes of the type CoXz tpt (where X = Cl, Br, I, or NCS). A third dimeric form is also reported of general formula Co2X4 tpt,nH2O (where X = Cl, n = 0 or I; X = Br, n = 0 or 2). In this latter form the ligand appears to function as a composite of both terpyridine and bipyridine, showing simultaneous terdentate and bidentate behaviour, with one cobalt atom in either a five-coordinate or six- coordinate environment, and the other metal atom involved in tetrahedral coordination. ��� In general the compounds formed are high-spin with normal room- temperature magnetic moments. The single exception is the red octahedral complex [Co tpt2]Cl2, 8.5H2O, which has a room-temperature moment of only 4.0 B.M.