The experimental determination of wave spectra and wave resistance from measurements of the wave pattern behind a ship model while being towed in a tank received considerable attention in the sixties and seventies. The Landweber, Hogben and Baba methods of experimental determination of wave pattern resistance based on wave height measurements in several longitudinal measurement cuts have been introduced in this paper. The programme of experimental determination of wave pattern resistance has been carried out in DINMA-Trieste for a trimaran whose individual hulls are Wigley parabolic models, for the Froude number range 0.254-0.420, with a total of 12 runs. The above mentioned methods are based on identical hydrodynamic model, and a starting basis are identical analytic expressions. By experimental determination of wave pattern resistance, a comparison of the calculation results (amplitude spectrum, wave resistance, reconstructed waveforms) is given. It has been shown that all three methods are equal and that they give the same results if the criteria based on frequency content determination and resolution in frequency are respected.

There are various types of series expansion systems around the world, offering high accuracy for calibration of standards. The method investigated in this paper considers a much simpler system with a higher degree of certainty in measurements. The novelty of the method does not offer a new calculation, but rather a muchsimplified design Instead of using a high number of vessels, where the gas expands into, the system is limited to only two. The uncertainties will relate only to the pressure reduction factors or volume ratios and other known external factors.

In this paper we present preliminary results of an ultrasonic flow measurement set-up designed to accurately measure the flow velocity profile of blood mimicking fluid pumped through a capillary flow phantom even under the deteriorating effects of clutter and noise always seen in medical ultrasound applications. The measurement system is set up in a way to acquire and display 3-dimensional velocity and/or topological data.

A pulp suspension flowing in a pipe has a tendency to form a profile: The properties of the pulp vary significantly in a cross-section of the flow. This causes problems both in online-measurements and sampling. The importance of representative sampling is further emphasized by the fact that samples taken are often used as reference in calibration of measurement instruments.
The problem of representative sampling and the variation of quality in a pulp flow were studied using equipment with which it was possible to take samples from different depths in the flow and thus determine the variations.
Experimental testing was conducted in different process conditions and with different pulp types. The results of the tests showed that the quality variations in a pulp flow were more profound than initially thought: Several pulp properties have significant profiles within the flow that depend on the type of the pulp and the flow conditions. The variation of pulp properties is large enough to somewhat affect all measurements made from the flow in question.
The findings of the study suggest new guidelines for sampling and installing instrumentation when a pulp suspension flow is measured.

The aim of this study is the development of a novel nonintrusive mass flowmeter for the moved bed gravity flow of the new process, i.e.: the synthetic naphtha and hydrogen making reactor and DRI (Direct Reduction for Iron Ore) reducing petroleum and coke coal. One of the authors already developed cross correlation method, steady state heat transfer method and PZT acoustic emission method. This paper describes a prototype of a new cross correlation method using a pulse heating marking signal (JPA 1999-23339). The steady state heat transfer type is improved ale to ±0.8% full scale in this paper and it is the most available for the new process till the third oil crisis or reconstruction of coke. This new prototype should be more useful for the derivative temperature against choking the feed powder on the surface of the temperature sensors. .