نتایج جستجو برای: sigmoid curve

تعداد نتایج: 142548  

Journal: :international journal of environmental research 2011
j. trögl k. benediktová

the acute ecotoxicity of a set of mixture samples (washing powders, wastes, fuel extracts etc.) was assessed using four acute ecotoxicity assays with aquatic organisms (daphnia magna, poecilia reticulata, artemia salina and desmodesmus subspicatus). the experimental concentration-response curves were fitted by seven two-parameter sigmoid equations using non-linear regression. the regression pe...

Journal: :international journal of environmental research 0
j. trögl faculty of the environment, jan evangelista purkyně university in ústí nad labem, králova výšina 3132/7, ústí nad labem, 400 96, czech republic k. benediktová faculty of the environment, jan evangelista purkyně university in ústí nad labem, králova výšina 3132/7, ústí nad labem, 400 96, czech republic, empla s.r.o, za škodovkou 305, hradec králov&ea

the acute ecotoxicity of a set of mixture samples (washing powders, wastes, fuel extracts etc.) was assessed using four acute ecotoxicity assays with aquatic organisms (daphnia magna, poecilia reticulata, artemia salina and desmodesmus subspicatus). the experimental concentration-response curves were fitted by seven two-parameter sigmoid equations using non-linear regression. the regression per...

2015
Daeho Jang Geunhyoung Chae Sehyun Shin

The present study introduces a novel curve-fitting algorithm for surface plasmon resonance (SPR) curves using a self-constructed, wedge-shaped beam type angular interrogation SPR spectroscopy technique. Previous fitting approaches such as asymmetric and polynomial equations are still unsatisfactory for analyzing full SPR curves and their use is limited to determining the resonance angle. In the...

Journal: :Journal of the Japanese Society for Horticultural Science 1990

Journal: :The Journal of hygiene 2007
C G Lemon

THE usual graphical method of expressing the increase of bacterial growth rate in a media by means of the bacterial number/time curve, has several disadvantages, inasmuch as that the maximum growth rate cannot be accurately determined, nor the period of optimum propagation. An improved method of presenting a bacterial growth-rate curve and eliminating the aforementioned disadvantages will now b...

Journal: :The American journal of physiology 1994
S S Sircar

The teaching of oxygen transport by hemoglobin is supported by a graphic depiction of the sigmoid O2 dissociation curve of hemoglobin. However, a reconstruction of the same curve into an alternate paradigm, the "O2-carrying flask," affords a visual demonstration of the significance of its sigmoid shape and the implications of its shifts, which should be useful in elucidating certain aspects of ...

1987
Frank H. Eeckman

We report a study ·on the relationship between EEG amplitude values and unit spike output in the prepyriform cortex of awake and motivated rats. This relationship takes the form of a sigmoid curve, that describes normalized pulse-output for normalized wave input. The curve is fitted using nonlinear regression and is described by its slope and maximum value. Measurements were made for both excit...

Journal: :Journal of animal science 2004
W B Staniar D S Kronfeld K H Treiber R K Splan P A Harris

The objective of this study was to establish a procedure for differentiating a baseline curve from a systematic deviation in weight-age data, and hence to develop a physiological growth model for the Thoroughbred. A total of 2,698 records for 175 foals was obtained during a period of 8 yr (1994 to 2001). Weight-age data were fit with a sigmoid growth equation, W = A(1 + be(-kt))M, where W is BW...

1999
COLIN P. D. BIRCH

A new sigmoid growth equation is presented for curve-fitting, analysis and simulation of growth curves. Like the logistic growth equation, it increases monotonically, with both upper and lower asymptotes. Like the Richards growth equation, it can have its maximum slope at any value between its minimum and maximum. The new sigmoid equation is unique because it always tends towards exponential gr...

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