Multi-cell battery protection system

A multi-cell battery protection system is described wherein each cell has its own individual protective circuit. The protective circuits consist of a solid state comparator unit and a high current switching device such as a relay. The comparator units each continuously monitor the associated cell and when the cell voltage either exceeds a predetermined high level or falls below a predetermined low level, the relay is actuated whereby a bypass circuit is completed across the cell thereby effectively removing the cell from the series of cells

Additive for zinc electrodes

A zinc electrode for alkaline cells includes up to about ten percent by weight of Ba(OH)2.8H2O with about five percent being preferred. The zinc electrode may or may not be amalgamated with mercury

SR-7A aeroelastic model design report

A scale model was designed to simulate the aeroelastic characteristics and performance of the 2.74 meter (9 ft.) diameter SR-7L blade. The procedures used in this model blade design are discussed. Included in this synopsis is background information concerning scaling parameters and an explanation of manufacturing limitations. A description of the final composite model blade, made of titanium, fiberglass, and graphite, is provided. Analytical methods for determining the blade stresses, natural frequencies and mode shapes, and stability are discussed at length

Improved silver-zinc battery-terminal seals

Development of battery terminal seal for sealing electrolyte for periods of three to five years is discussed. Operating conditions of battery are defined. Components of electrolyte seal and method of production are reported. Schematic diagrams of device are included

Role of Secondary Interactions (π, agostic) as well as Solvent Influence on Alkali metal complexes

We here attempt to synthesize heterobimetallic alkali metal complexes with bulky phenolate ligands via solid state direct metallation. The solid state route may offer a facile method of producing these heterobimetallic species. Synthesis of heterobimetallic alkali metal compounds remains a challenge, as the homometallic complexes are generally favored over formation of the heterobimetallic species. Previous work has shown that the alkali metals have a strong solvent dependency; the recrystallization of heterobimetallic products from toluene yields the heterobimetallic, while recrystallization from THF yields the homometallic. However, the ability for phenolate ligands to stabilize metal centers through secondary interactions, such as M∙∙∙π interactions, has also been observed to compete with solvents in saturating the coordination spheres of the metals. A novel group of potassium-containing 1-D coordination polymers demonstrates the importance and role of K-Cp interactions. [K(Odpp)]∞, 1,(Odpp = 2,6-diphenylphenolate) forms a ladder-type polymer where extensive K-Cp interactions provide additional coordinative saturation. {[K2(Odpp)2H2O]2}∞, 2, consists of tetrameric cores of K4O6 polyhedra linked via a network of K-Cp interactions. Compound 2 displays not only inter- and intramolecular K-Cp contacts, but also several K-H agostic interactions that provide further coordinative saturation

Candidates for Aristotle\u27s Natural Slaves

The aim of this paper is to identify empirically potential candidates for natural slaves among the vast number of coerced workers in the ancient world, barbarian and Greek alike