Chalk is the constituent material of numerous oil reservoirs in North Sea. The mechanical behaviour of a saturated chalk has been largely studied. However, different aspects of its behaviour are not yet well understood: material characteristics depend on the saturating fluids and chalk response is timedependent. This paper proposes the PASACHALK numerical model: an elasto-plastic constitutive l...

Since the transport of biological fluids through contracting or expanding vessels is characterized by low seepage Reynolds numbers, the current study focuses on the viscous flow driven by small wall contractions and expansions of two weakly permeable walls. The scope is limited to two-dimensional symmetrical solutions inside a simulated channel with moving porous walls. In seeking an exact solu...

The purpose of present problem is to studies of effects of variable viscosity and heat source on unsteady laminar flow of dusty conducting fluid between parallel porous plates through porous medium with temperature dependent viscosity. The fluid is considered as unsteady laminar flow through porous medium and acted upon by a constant pressure gradient and an external uniform magnetic field is a...

An attempt was made to develop a single, rapid, specific, and sensitive gradient reversed-phase ultra-performance liquid chromatographic method for quantitative analysis of levofloxacin. The single method thus developed is applied for the quantification of levofloxacin both in aqueous humour as well as pharmaceutical dosage forms (i.e., tablets and eye drops). The newly developed method is appl...

In the 21 st Century, reducing the environmental impact of aviation will become an increasingly important priority for the aircraft designer. Among the various environmental impacts, emission of CO2 can be expected to emerge as the most important in the long term and reducing fuel burn to become the overriding environmental priority. Increasing fuel costs and the world’s limited oil reserves wi...

PURPOSE To evaluate the concentration and kinetics of dorzolamide in the aqueous humor after its topical application. METHODS Samples of aqueous humor were collected at the beginning of routine cataract surgery at defined intervals after topical application of a 2% solution of dorzolamide. After deep-frozen storage of the samples, drug extraction was achieved with a mixture of solvents. Quant...

This study involves a reversed-phase gradient HPLC related substances (impurity) analytical method, for a drug product. These types of analyses are of crucial importance because the data they supply is such that it might be part of qualifier information used by regulatory organisations to determine whether marketing authorisations applications are to be accepted or not. P bl b d i thi th d h t ...

An experimental device and procedure are described for the fully automatic determination of the surface tension of liquids and (particularly) surfactant solutions. The computercontrolled system is capable of yielding precise and reproducible values of that quantity. The possibilities of equilibration times selected by the user. cleaning the surface by suction. and adding fresh solution prior to...

The presence of liquid refrigerant in the compressor cylinder during operation, or liquid slugging, is one of the most common causes of failure in reciprocating compressors. We propose to detect this fault by analyzing the electrical current flowing into the compressor and identifying the change in the load on the motor caused by the presence of liquid in the compressor cylinder. Two different ...

Abstract The leakage and ignition of flammable liquids such as fuel hydraulic liquid on transport aircraft are extremely harmful to passengers. drainage design is an effective means reduce the probability resultant hazards if does occur. test required show compliance with Article 25.863, ground must be performed before flight test. This paper deeply studies Draft AC 25.863 gives airworthiness r...