Hall in

Application of the variational self-consistent field method to the Haitiee-Fock equations with a linear combination of atomic orbitals leads to the Roothaan-Hall equation set published contemporaneously and independently by Roothaan and Hall in 1951. For a minimal basis set, there are as many matr ix elements as there are atoms, but there may be many more elements if the basis set is not minimal. 

The method of obtaining aluminum metal by the electrolysis of alumina dissolved in cryolite was discovered in 1886 by Hall in the U.S. and at about the same time by Heroult in France. Cryolite, a natural ore found in Greenland, is no longer widely used in commercial production, but has been replaced by an artificial mixture of sodium, aluminum, and calcium fluorides. 

Masuch, J. 1 992. The influence of air outlet directions on the stability of air flow patterns in large halls. In Roomvent 92 Proceedings of the 3rd International Conference on Air Distribution tit Rooms, vol. 1, pp. 539-552. Aalborg, Denmark. 

During summer. Fig. S. 6a, there is a need for cooling in the occupied zone (area up to 2 m from the floor level) rhus it is desirable to apply the stratification strategy with vertical temperature and contaminant stratification in the hall in order ro save cooling energy costs. This can be done, for example, by using a low-impulse air supply with the devices at the floor level. 

It the main reason for the stratification strategy is contaminant control in [he occupied zone, the same strategy should be applied in winter conditions, too. Thus, the selected hearing method has to fulfill two requirements to siip-pttrt the creation of the vertical stratification and not to create disturbing airflows into the hall. In this case one option would be the floor heating method see Fig. 8.16c. Additionally, one should consider the prevention of boundary layer flows along the outer walls using, for example, passive methods. -... 

The same types of units are also used to distribute supply air over larger areas such is a whole factory hall. In those installations, however, the umts are mounted higher up. The term air shower is therefore reserved in this context for the supplying of fresh air to a workstation with one person. 

Dorer, V, Schaiin, A. On the combined application of thermal and CFD modelling in the design of naturally ventilated industrial halls. In Roomvent 2000, Reading, UK, 2000. 

Outdoor temperature at night falls below a certain threshold, in order to prevent too low temperatures in the hall in the morning. 

These arresters consist of a tower or honsing filled with varions sizes of metal shot (halls) in ahont nine zones. The size of the halls varies from 4 to 7 mesh for the larger halls and 40 to 60 mesh for the smallest halls. The... 

The equilibrium between neutral a and zwitterionic b forms in the case of nicotinic 6 and isonicotinic 7 acids has been studied by Halle in mixtures of DMSO and water (from 0 to 100%) (Scheme 4). The position of the equilibrium is very sensitive to the composition of the solvent and for more than 80% of DMSO, the a form essentially dominates the equilibrium in solution (96CJC613). An analysis of their data shows a perfect linear relationship (r = 1) between the In Kt of the two acids and moderate linear relationships between In Kt and the percentage of DMSO. Johnston has studied the equilibrium 2-hydroxypyridine/2-pyridone in supercritical fluids (propane at 393 K and 1,1-difluoroethane at 403 K) (89JPC4297). The equilibrium constant Kt (pyridone/hydroxypyridine) increases four-fold for a pressure increase of 40 bar in 1,1-difluoroethane. 

In contrast, aluminum (abundance = 7.5%), despite its usefulness, was little more than a chemical curiosity until about a century ago. It occurs in combined form in clays and rocks, from which it cannot be extracted. In 1886 two young chemists, Charles Hall in the United States and Paul Herroult in France, independently worked out a process for extracting aluminum from a relatively rare ore, bauxite. That process is still used today to produce the element. By an odd coincidence, Hall and Herroult were born in the same year (1863) and died in the same year (1914). 

Registry Numbers. Annual supplements, with cumulative indexes, have appeared since 1983. A similar work, devoted to organometallic compounds, is the 2nd edition of the Dictionary of Organometallic Compounds , 6 vols. in its 5th supplement, published by Chapman and Hall in 1989. Another, Dictionary of Steroids , 2 vols., 1991, is also published by Chapman and Hall. 

To convert aluminum from the stuff of princes toys into recyclable kitchen foil required an inexpensive electrolytic reduction process. Two 22-year-old scientists, the American chemist Charles Hall and the French metal-lurgist Paul Heroult, discovered the same process independently in 1886. Both became famous as founders of the aluminum industry. Hall in the United States and Heroult in Europe. 

The first production of aluminum was by the chemical reduction of aluminum chloride with sodium. The electrolytic process, based on the fused salt electrolysis of alumina dissolved in cryolite, was independently developed in 1886 by C. M. Hall in America and P. L. Heroult in France. Soon afterwards a chemical process for producing pure alumina from bauxite, the commercial source of aluminum, was developed by Bayer and this led to the commercial production of aluminum by a combination of the Bayer and the Hall-Heroult processes. At present this is the main method which supplies all the world s needs in primary aluminum. However, a few other processes also have been developed for the production of the metal. On account of problems still waiting to be solved none of these alternative methods has seen commercial exploitation. 

This includes specialist shops, gourmet food shops, health food shops, natural food stores, and other farm shops, including delicatessens and food halls in large departmental stores. 

Attacked by Hall in his Codex Rosae Cruets. A detailed comparison of the Hartmann,... 

Also papers by C. Hill and A. R. 8c M. B. Hall in this issue are of some interest... 

Vincent Rillieux freely acknowledged his family. Norbert was baptized by a Roman Catholic priest in St. Louis Cathedral, where blacks and whites knelt side by side to pray. The child s birth was registered in City Hall in a mixture of French and English as Norbert Rillieux, quadroon libre, natural son of Vincent Rillieux and Constance Vivant. The words, quadroon libre, stipulated that Norbert was a free African American with more white ancestry than black. 

FIGURE 32-6 Lipid peroxidation leads to fragmentation or oxidation of polyunsaturated fatty acids (PUFA). HO, hydroxyl radical LO, lipid alkoxylradical LOO, lipid peroxyl radical 0 2, superoxide radical O, atomic oxygen radical. (From Hall in [3].)... 

Hall (1) Also called the dry puddling process. An early ironmaking process, invented by J. Hall in 1830. 

Hall (2) A process for making fuel gas from petroleum fractions and residues by thermal cracking. Developed by W. A. Hall in 1913, later forming the basis of the Gasmaco process. See also Petiogas. 

Hall (4) A process for making alumina by reducing bauxite with coke in an electric furnace. The co-product is an alloy of iron-silicon-aluminum-titanium. Invented by C. M. Hall in 1901 and later developed and commercialized by ALCOA. 

Hall-Heroult An electrolytic process for making aluminum metal from alumina, invented in 1886 independently by C. M. Hall in the United States, and P. L. Heroult in France. The alumina, made by the Bayer process, is dissolved infused cryolite, Na3AlF6, and electrolyzed at approximately 1,000°C. Because of the large requirement for electricity, the process is operated only where hydroelectric power is available. The cryolite was originally obtained from a deposit in Greenland but is now made synthetically from alumina, hydrofluoric acid, and sodium hydroxide ... 

Two spirals as an art object for a public space -designed for the square in front of the city hall in Wiesbaden. The dates of historical events from the first millennium AD are engraved in the inner rim of the smaller spiral, dates telling the story of the second millennium are engraved in the larger one. Jets of water around the objects create rainbow spectra in the sunlight the pool is made of black granite. 

The most important of my current concrete projects is a pulsating, symbolic heart sculpture that creates a balance between the organic, technological and spiritual spheres, conceived for the public space in front of the new city hall in Moscow [Moscow International Business Center] - a future-oriented artwork in the urban jungle of the metropolis of Moscow that invites the beholder to pause, to reflect, to find harmony and balance. In other words With this artwork,... 

UNTITLED, 1972-1973 Reception Hall in Defense Ministry Moscow, Russia... 

A. Redey, D. Smrz and W. K. Hall, in New Frontiers in Catalysis (Ed. L. Guczi), Proceedings of the 10th International Congress on Catalysis, 1992, Budapest, Elsevier, Amsterdam, 1993, p. 2383. 

Andreas Libavius was bom at Halle in Germany in 1540, where he studied medicine and practised for a short time as a physician. He accepted the fundamental iatro-chemical doctrines, at the same time, however, criticising certain of the more extravagant views expressed by Paracelsus. He was a firm believer in the transmutation of the metals, but his own activities were chiefly directed to the preparation of new and better medicines. He enriched the science of Chemistry by many valuable discoveries, and tin tetrachloride, which he was the first to prepare, is still known by the name of spiritus fumans Libavii. Libavius was a man possessed of keen powers of observation and his work on Chemistry, which contains a fidl account of the knowledge of the science of his time, may be... 

Arcamone, F., C. Bonino, E. B. Chain, A. Ferretti, P, Pennella, A. To-nolo, and L. Veto Production of Lysergic Acid Derivatives by a Strain of Claviceps paspali Stevens and Hall in Submerged Culture. Nature 187, 238 (1960). 

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