Over the past two decades, a variety of micropumps have been explored for various applications in microfluidics such as control of picoand nanoliter flows for drug delivery as well as chemical mixing and analysis. We present the fabrication and preliminary experimental studies of flow performance on the micro impedance pump, a previously unexplored method of pumping fluid on the microscale. The...

We consider the evolution of an annular two-dimensional region occupied by viscous fluid driven by surface tension and applied pressure at the free surfaces. We assume that the thickness of the domain is small compared with its circumference so that it may be described as a thin viscous sheet whose ends are joined to form a closed loop. Analytical and numerical solutions of the resulting model ...

The identification and quantification of atoms, molecules, or ions concentrations in gaseous samples are in great demand for medical, environmental, industrial, law enforcement and national security applications. These applications require in situ, highresolution, non-destructive, sensitive, miniature, inexpensive, rapid detection, remotely accessed, real time and continuously operating chemica...

We report a simple square capillary-based cell affinity chromatography device that utilizes a coating of aptamers for selective capture of target cancer cells from a flowing suspension. The device consists of a square capillary with an inner diameter of roughly five cell diameters, connected via Teflon tubing to a syringe. Aptamers are immobilized on the inner surface of the capillary through b...

Polymeric polyimide capillary tubing, both uncoated and coated with stationary phases of two polarities, is explored for use as capillary columns for gas chromatography (GC). These glass-free polyimide columns are flexible and their small winding diameter of less than a cm around a solid support makes them compatible for potential use in portable GC instruments. Polyimide columns with dimension...

Natural plankton assemblages were incubated with a small piece of silicone. Tygon or latex rubber tubing in 200 m1 of culture to determine potential long-term toxic effects of the tubing. Drastic decreases in cell numbers and chlorophyll fluorescence indicated that over 95 "h of the phytoplankton were killed by the latex rubber tubing in 4 d. Even a 1 mm piece of latex tubing lulled -90 % of th...

The cataphoresis cells previously described I,~ are troublesome to make and have the further disadvantage that they cannot be cleaned with cleaning solution. Dr. D, P. Morgan called the writers' attention to the fact that a flat glass capillary cell could be made by drawing out tubing sidewise as shown in Fig. 1. A 1.5 cm. test-tube is a convenient size to use. The capillary should be about 1.0...

3.1 Overview 3.2 Overview of Nodal Analysis 3.3 Selection and Determination of Tubing and Production Casing Sizes for Flowing Wells Importance of Sensitivity Analysis of Tubing Size Sensitivity Analysis and Optimization of Tubing Size of Flowing Well Optimization Method Based on Surface Tubing Pressure Derived by Given Separator Pressure Optimization Method Based on the Given Wellhead Tubing Pr...

Plasticized polyvinyl chloride tubing is used as the blood conduit in the heart lung bypass circuit. The section in the roller pump undergoes rigorous compression. Fatigue leads to material changes in weight and length of the bulk material. Particles are released during normal pump operation. This study evaluates the time course of particle loss. Three segments of 1/2" ID tubing run in the race...