Wastewater Disinfection Efficiency Using One- Step and Two-Step Chlorination

One-Step and Two-Step Estimation of the Effects of Exogenous Variables on Technical Efficiency Levels

Consider a stochastic frontier model with one-sided inefficiency u, and suppose that the scale of u depends on some variables (firm characteristics) z. A “one-step” model specifies both the stochastic frontier and the way in which u depends on z, and can be estimated in a single step, for example by maximum likelihood. This is in contrast to a “two-step” procedure, where the first step is to es...

One step forward

One-step and two-step bait fishing: Evaluation of results

The evaluation of the SILAC AP-MS experiments required a threshold for the SILAC ratio to define when an identified protein should be considered a contaminant or putative interaction partner. Other studies apply a statistical measure such as the Grubbs outlier test [1] or the z -test [2] to measure whether the deviation of a SILAC ratio is significant. These tests presuppose that the parameter ...

One-step two-wavelength holography.

One-step two-wavelength holography is obtained with twointerferometric beams with different wavelengths by means of apolarizing modulation produced by a liquid-crystal lightvalve. This holographic method eliminates the need for preliminarystatic recording of the hologram and permits one-step two-wavelengthholographic testing to produce results easily in real time.

Dimensional accuracy of three impression materials by one-step and two-step impression techniques: An in vitro study

Introduction: An accurate impression is essential to create a well-fitted dental prosthesis. This study aimed to compare the dimensional accuracy of three elastomeric materials using one-step and two-step impression techniques. Methods: In this study, 20 impressions were fabricated for each Vinyl siloxane ether (Identium), condensation silicone (Speedex), and a...