Shear tests were conducted on sandstone and marble samples described in the lst. Report and on shale samples. Sandstone and marble were sheared while restricting normal displacement, and shale specimens sheared at constant normal stress perpendicular and parallel to stratification.
Normal stiffness values were higher for marble than sandstone. Shear stiffness increased with initial normal stress and indicated no glaring disparity between specimens sheared at constant normal stress and those sheared otherwise. Peak and residual strengths at corresponding normal stresses for both test procedures were virtually equal and the results compare favourably with those obtained by use of the triaxial compressive testing machine.
During shearing with restricted normal displacement, eventual maximum normal stresses were multiples of respective initial normal stresses. Gradients of positive slopes of curves for sandstone decreased as initial normal stress increased. Marble manifested a reverse trend. At failure, a conspicuous drop in normal stress was noticed for sandstone but marble exhibited no such phenomenon. These discrepancies are attributable to differences in their elastic module.
More powder was produced per unit shear displacement then during tests conducted at constant normal stress. Greding analyses of the powder indicate non-dependence of grain size on normal stress.
With shale, no significant difference was observed in seismic wave velocities measured perpendicular and parallel to stratification. Slightly lower peak but higher residual angles of internal friction and higher dilatancies were obtained for specimens sheared perpendicular to stratification.
Field and labolatory test results agree reasonably. Peak strengths of field tests fall between residual and peak strengths of laboratory tests.

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The progress of micro electric devices at the present day has made it possible to plan mine ventilation real time control which is one of the effective methods for safety in mine. The development of not only hardwear but also softwear will be required for real time control of mine ventilation. In this paper, some factors about a softwear for this purpose are explained.
Main results are as follows;
1) A new method of solving airflow rates in a network by combinating quadratic equation method and ‘The Hardy Cross method’ converges more rapidly than a method by using ‘The Hardy Cross method’ only.
2) Making a depression diagram and a depression loss-airflow rate (H-Q) diagram from mine ventilation analysis, the condition of ventilation in a network is shown graphically.
3) When natural ventilation pressure “H_N” acts at a closed circuit “C” in a network, energy “F_Q” supplied by a fan depends on aerodynamic resistances of branch in “C”. To make energy “F_Q” less, it is profitable that airflow in a branch having small aerodynamic resistance is the same direction as “H_N” and airflow in a branch having large one is the contrary.
4) Aerodynamic resistance of branch in a network can be determined, approximately, by simulation method from working points of fans and airflow rate measurement at all the branches under different condition of the network.

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It is the aim of this paper to provide a guide to the methacoal transportation design, that is to enable to determine the flow condition of the methacoal slurry of Casson characteristic fluids in pipes.
The application of the authors method using the stability parameter (i.e. Eq.(2)) for predicting the lower critical Reynolds number is extended to include the flow of Casson fluids in pipes and between parallel plates. The theoretical equations to estimate the lower critical Reynolds number for Casson fluids flow in pipes and between parallel plates are derived as Eqs.(12) and (23) respectively.
The reliability of the estimated values derived from these equations is not confirmed because at present no published loop test data which can be used to verify the theoretical results exist. These equations, however, seem to be suitable for predicting the lower critical Reynolds number of Casson fluids flow in pipes and between parallel plates, since a special case of Casson fluids (i. e. yeild stress τ_y=0) is a Newtonian fluid and the the theoretical results derived from the authors' method for Newtonian fluids and non-Newtonian fluids with/without the yield stress show good agreement with the experimental ones.

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Stationary beds of particles in a pipeline can lead to excessive pressure or line blockage, and thus it isrequired to reveal mechanism by which the solid particles will form a deposit in a pipe. This paper describes theexperimental work of incipient conditions of sediment particles in a horizontal pipe. Experiments were performed in a 2.60cm (ID), 5.1mlong transparent plastic pipe using sand grains of uniform sizes of 1.21, 2.19, 2.61 and 3.10mm. The discharges and pressure gradients were measured for water flowing through the horizontal pipe with sand sediment beds of different thickness, when the flow conditions reached the critical conditions under which the particles of the bed were scarcely discharged buttemporarily few particles were in motion, and the pressure gradient was steady. The scatter of data in our experiments wasconsiderable, since the experimental range of Reynolds numbers was in the neighborhood of the critical zone. However, the data were inreasonably close agreement with predicted values from proposed relationships, which could fairly explain the experimentalresults of other investigators.

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The size reduction of waste polymer and composite materials has become an important subject in the field of waste reclamation. Energy consumptions in size reduction of waste polymers and composites as GFRP (Glass Fibre Reinforced Plastics) are very large for the reason of their high strength.
Then in order to increase the pulverizing rate of polymers and GFRP, its dependence on boiling watercorrosion has been investigated for polymers (2 kinds of unsaturated polyester) and GFRP.
The results obtained are as follows:
(1) For the Polymers, pulverizing rate increased with increasing immersion time in boiling water.
(2) For GFRP, on the aperture size of screen D=12-8mm, pulverizing rate displayed a minimum at a criticalvalue of immersion time (after about 12hr from start), and after that, increased rapidly, on D=6-4mm, thepulverizing rate increased from first.
And it was found that the pulverizing rate depended on changes ILSS (Interlaminer shear strength) andspecific strength due to boiling water corrosion.

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When allowed to react with ZnO at 873 K, H₂S-H₂ gas mixture turns into H₂O-H₂ gas mixture almostcompletely. The H₂O/H₂ gas ratio, which should correspond to the H₂S/H₂ ratio in the gas mixture originally passed, canbe evaluated from the emf measurement utilizing an oxide solid electrolyte. The effectiveness of the H₂S/H₂ gas sensor, basedon this principle, has been shown experimentally in the present investigation. As an example of the applications, the sulfurpartial pressure exerted by Ag-Ag₂S two melts was measured by using this H₂S/H₂ gas sensor. The present experimental results werefound to be in reasonable agreement with the published values.

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Since spent catalyzer disposed from the desulfurization process of crude oil contains a considerable amountof combustible matters, such as crude oil, sulfur and carbon, the applicability of self-burning roast process wasexamined. The roasting of method of self-burning can be applied without any difficulty to roast spent catalyzer for indirectdesulfurization use with and without sodium carbonate addition. On the other hand, this method is only effectively applicable to spentcatalyzer of direct desulfurization use for the roasting with sodium carbonate addition, resulting a high extraction of Mo aswell as V. The merit and demerit of self-burning roast of spent catalyzer were discussed in the comparison with those of rotarykiln roasting of spent catalyzer.(Received August 11, 1983)

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