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## Shield method for the construction of tunnels with monolithically pressed concrete lining in sands and clayey sands

### Hydrotechnical Construction (1969-01-01) 3: 22-26 , January 01, 1969

### Conclusion

For obtaining a high quality, molithically pressed lining for tunnels in sands and clayey sands at nautral moisture content, the following basic conditions should be fulfilled: a)

The shove of the shield should be so chosen that, consistent with the construction of the shield and the force of the jacks, a uniform, continuous movement is ensured throughout the shove.

b)The pressing unit should have facilities for rotation, essential for carrying out work along the chosen track without eccentricity, while the pressure, built up by the unit, should be adequate for repressing of concrete and compaction of the soil all around the lining perimeter.

c)The formwork should not cause harmful mechanical effects on the lining during the setting and hardening of concrete.

d)The composition of the concrete mix should be so chosen that its repressing ability is preserved during the entire process of advance of the shield.

## Miscellaneous Problems

### Torsion in Structures (1969-01-01): 176-201 , January 01, 1969

It was the purpose of Chapter 9 to determine deformations and internal forces in members which carry torsionai moments both by means of Saint-Venant and warping torsion (mixed torsion). The solutions to this problem did not depend on any particular assumption concerning the shape of the cross section. All geometric and elastic properties of a structural member were considered in one nondimensional parameter *x* which, aside from the normalization length *l*, is a function of the ratio between the Saint-Venant torsionai rigidity *G K* and the warping rigidity EI_{ωω} [v. Eq. (9.11)].

## The inductive iris double discontinuity

### Applied Scientific Research (1969-01-01) 20: 61-76 , January 01, 1969

### Summary

The reflection coefficient of a double discontinuity consisting of two closely spaced inductive irises in a rectangular waveguide is found. Standard transmission line techniques are no longer valid when the irises lie close together. Instead, the solution must include effects of interaction of the higher order modes excited by each iris. A variational expression for the reflection coefficient including the effects of the higher order modes is derived in terms of integrals of the induced current on one of the irises. The solution shows how more higher order mode terms become significant in determining the reflection coefficient as the iris spacing decreases. A numerical example is presented using only a few of the higher order mode factors. The results follow measured values of the reflection coefficient with spacings as close as 1/32 of a waveguide wavelength. More terms in the solution are required for closer spacings. The numerical example correctly predicts the spacing (3/16 of a waveguide wavelength) at which the higher order mode interaction becomes significant and the transmission line solution deteriorates.

## Some aspects of the electrolytic production of magnesium in IG cells

### JOM (1969-04-01) 21: 43-49 , April 01, 1969

### Conclusion

The economic results of the production of magnesium in an IG electrolytic cell are greatly dependent on know-how. The process offers a number of interesting problems, and seems to have great development potential. In addition to know-how local conditions are of decisive importance for process economy.

## Some characteristics of radiochemical conversions of fluoroolefins

### Soviet Atomic Energy (1969-03-01) 26: 267-271 , March 01, 1969

### Conclusions

1.

We have studied the effect of ionizing radiations on fluoroolefins and shown that the main reaction is polymerization, which, in the investigated range from −78 to 100°C, takes place by a radical mechanism.

2.The anomalous temperature dependence of the radiation polymerization rate of fluoroethylenes is shown.

3.Fluoroolefins exhibit different polymerization activities under the effect of ionizing radiations, the actual value depending mainly on the number of fluorine atoms in the monomer molecule.

## Forthcoming articles

### Applied Scientific Research (1969-01-01) 21: 85-86 , January 01, 1969

## Messung des laminaren Strömungsprofils in einem zylindrischen Rohr mit kohärenter Strahlung von 6328 Å

### Zeitschrift für angewandte Mathematik und Physik ZAMP (1969-07-01) 20: 577 , July 01, 1969

## Chairman's Report

### Matériaux et constructions (1969-07-01) 2: 253-266 , July 01, 1969

## Heat transfer between a flat plate with a nonstationary surface temperature and a laminar flow of liquid around it

### Journal of engineering physics (1969-09-01) 17: 1131-1136 , September 01, 1969

Analytical formulas are derived to describe the nonstationary heat transfer taking place when a laminar flow of liquid passes around a flat plate, the surface temperature being an arbitrary but specified function of time.