Six popular height curve equations were adopted to fit with height curve and the results were assessed.

As we all know,height curve play an important role in the forest management and forest yield regulation.

Analysis of stability for calibration curve about determination of phenols with method of 4-Amino antipyrine;

Using this model,uncertainty factors in the tollowing critical experimental steps which could affect volatile phenol analysis results,including reference standard solution preparation,calibration curve establishment and method reproducibility,were determined.

In the light of the oil content testing method of SY/T 5329-94 "Recommended Index for the Injection Water Quality for Clastic Reservoir and its Analyzing Method", regresses the oil content calibration curve by using the method of least squares; and verifies the relativity of oil content calibration curve by using the theory of probability and mathematical statistics.

Measuring the chemical oxygen consumption by standard curve deduction method;

Study on influencing factors for standard curve of TTC-Dehydrogenase activity measurement

Organic solvents, such as petroleum ether and gasoline, are used as extracting agents to measure oil content in oilfield waste water and the normal curves of reference oil are plotted.

Ultraviolet photometric method is used to determinate the concentration of ozone from ozone instrument and compare normal curve of Indigo Disulphonate Spectrophotometry.