Hewlett-packard Company

Other

Sequoia-turner Corporation

Andrew Stefanski

Paul C Dryden

Barry G Willis

Arthur Schleifer

Norton W Bell

C Nelson Dorny

Joel Myerson

Peter E Lobban

Alfred H Sturtevant

H Bryan Bente

Michael G Konicek

Alan C Herman

Benjamin G Shaw

An automobile rigid convertible roof (4) retracts horizontally rearward over the rear part of the upper body. The rear end of the roof is supported by two external elongated struts (12L and 12R) which are permanently attached to the rear corners of the roof at their upper ends and retract with it as a unit. Strut bottom rollers (18) are guided by guides (22) mounted adjacent the vehicle rear deck. The struts (12) are outside of the vehicle cockpit enclosure. The retracted roof is moved horizontally so that the retracted roof panel does not interfere with rear vision from the cockpit and in the retracted position does not use any cockpit or vehicle trunk volume for roof storage.

Motor vehicle with sliding roof

A plurality of different liquid solutions are connected to an input of a pump system having at least two displacement chambers and in a manner to control the proportions of each constituent that are taken into each chamber during its intake stroke. The outputs of the chambers are connected to a common liquid output. The chambers are driven by independently controllable motors so that the discharge stroke may be chosen to have some parameters, such as speed profile and duration, that are different than during the intake stroke. As a result, both chambers may simultaneously discharge liquid through the common output, if desired. The proportion of constituents may be made different each time one of the chambers is filled, so the simultaneous discharge of the chambers allows a gradual, carefully controlled change from the mixture of one chamber to that of the other. Thus, the pump system can be operated to provide a combination of low pressure and high pressure mixing of two or more liquid constituents in order to provide a smooth gradient in the output liquid flow. Output liquid flow rate can be controlled by changing the time in which the chamber's volume is reduced, or by controlling the maximum volume of the chamber's displacement, or both. Such a pumping system is especially useful in providing a solvent mixture with a gradually changing composition to a liquid chromatograph column.

Fluid proportioning pump system

Variations in the intensity of a light source and the sensitivity of a fluorescence detector photo-multiplier tube are simultaneously compensated by measuring the intensity (I.sub.LS1) of the light source at the sample excitation frequency with a silicon detector, measuring the intensity (I.sub.LS2) of the light source at the emission frequency with another silicon detector, measuring with the photo-multiplier detector the intensity (I.sub.S) of the sample's fluorescence and the intensity (I.sub.LS3) of the light source at the emission frequency of the sample and then calculating a value F as representative of the sample's fluorescence according to the formula: ##EQU1##

Fluorescence intensity compensation method and device

An instrument is disclosed which performs measurements and calculates the average and the variance of the measurements. The particular instrument illustrating the invention is a spectrophotometer which measures sets of dark, reference and sample spectra for use in calculating an average absorbance spectrum and its variance. The measurements are performed in an order which enables the cancellation of measurement variation due to variation in instrument response. The order of measurements is determined by measurement subroutines which can be aggregated to produce a series of measurements performed over a user selected period of integration time.

Method of performing measurements and error analysis of the measurements

Apparatus for performing measurements and error analysis of the

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Menlo Park, CA, United States of America

Andrew Stefanski