Abstract: The invention provides systems and methods for determining the allocation of securities in a portfolio. The method includes providing a collection of securities in a portfolio, each security being associated with associated attributes; providing risk factor data related to the portfolio; pooling the securities into a plurality of security clusters based on the attributes associated with each security and the risk factor data, each security being assigned to an security cluster, the pooling being performed using multivariate decision tree processing; processing the security clusters using a nonlinear programming optimizer to generate optimization results; and presenting the optimization results in a risk-return space for determination of a security allocation.

Abstract: A chromatography system and method employing an empirical method for determining the ratio ##EQU1## for a chromatography column with improved accuracy by establishing experimental conditions for at least one of the parameters of temperature, pressure and flow and measuring the other parameters and calculating the ratio ##EQU2## using the Poiseville equation for a chromatography column.

Abstract: A wire rod type stacking office furniture chair and method of assembling same, comprising, including a separate chair seat and back for same, a pair of endless rodding members each defining along the left and right sides of a chair a lower quadrilaterally contoured base frame having lower floor engaging runners that may be glide equipped and upper runners above the chair lower runners that support the chair seat between them, with the rodding members adjacent the rear of the chair each defining a similar vertically oriented upright, chair shoulder forming loop, between which shoulders the chair back is supported. The chair back comprises an assembly including a mounting pan fixed between the chair right and left side shoulder forming loops, an inner opaque back member, and an outer opaque back member, with such back members being secured together in opposed relation on either side of the mounting pan and in encapsulating relation to such pan, by interfitting devices that are also concealed.

Abstract: A wire rod type stacking office furniture chair comprising, including a separate chair seat and back for same, a pair of endless rodding members each defining along the left and right sides of a chair a lower quadrilaterally contoured base frame having lower floor engaging runners that may be glide equipped and upper runners above the chair lower runners that support the chair seat between them, with the rodding members adjacent the rear of the chair each defining a similar vertically oriented upright, chair shoulder forming loop, between which shoulders the chair back is supported; the chair back comprises an assembly including a mounting pan fixed between the chair right and left side shoulder forming loops, an inner opaque back member, and an outer opaque back member, with such back members being secured together in opposed relation on either side of the mounting pan and in encapsulating relation to such pan, by interfitting devices that are also concealed, and with the chair seat also comprising an assemb

Abstract: A wire rod type stacking office furniture chair comprising, including a separate chair seat and back for same, a pair of endless rodding members each defining along the left and right sides of a chair a lower quadrilaterally contoured base frame having lower floor engaging runners that may be glide equipped and upper runners above the chair lower runners that support the chair seat between them, with the rodding members adjacent the rear of the chair each defining a similar vertically oriented upright, chair shoulder forming loop, between which shoulders the chair back is supported; the chair back comprises an assembly including a mounting pan fixed between the chair right and left side shoulder forming loops, an inner opaque back member, and an outer opaque back member, with such back members being secured together in opposed relation on either side of the mounting pan and in encapsulating relation to such pan, by interfitting devices that are also concealed, and with the chair seat also comprising an assemb