Study of radiation effects on mammalian cells in vitro

Radiation effect on single cells and cell populations of Chinese hamster lung tissue is studied in vitro. The rate and position as the cell progresses through the generation cycle shows division delay, changes in some biochemical processes in the cell, chromosomal changes, colony size changes, and loss of reproductive capacity

Evaluation of cermet materials suitable for lithium lubricated thrust bearings for high temperature operation

Cerment materials (HfC - 10 wt% W; HfC - 10 wt% TaC - 10 wt%W; HfC - 2 wt% CbC - 8 wt% Mo;Hfn - 10 wt% W; Hfn - 10 wt% TaN - 10 wt% W; and ZrC - 17 wt% W) were evaluated for possible use as lithium-lubricated bearings in the control system of a nuclear reactor. Tests of compatibility with lithium were made in T-111 (Ta-8W-2Hf) capsules at temperatures up to 1090 C. The tendencies of HfC-TaC-W, HfC-CbC-Mo, and HfN-W to bond to themselves and to the refractory alloys T-111 and TZM when enclosed in lithium-filled capsules under a pressure of 2000 psi at 980 and 1200 C for 1933 hours were evaluated. Thermal expansion characteristics were determined for the same three materials from room temperature to 1200 C. On the basis of these tests, HfC-10 TaC-10W and HfN-10W were selected as the best and second best candidates, respectively, of the materials tested for the bearing application

The polar temperature of Venus

Interferometric and polarization measurements of polar regions of Venu

The Semantics of Common Law Predicates

Symposium: Semiotics, Dialectic, and the Law Held at Indiana University School of Law - Oct. 13, 198

Modern treatment of appendicitis

Appendicitis is a disease which has only very recently - within the last twenty years - been studied at all. The pathology of the disease shows us that it occurs in attacks of three kinds - acute, medium, and very mild. In the acute variety the disease is well under - stood and the treatment is acknowledged by everyone to be immediate operative interference. In the mild variety, the symptoms are so slight that the disease cannot be definitely recognised. Nevertheless pathological changes occur in the appendix which produce serious results later on. In the medium variety, the symptoms are definite but the treatment varies. Appendicectomy during the height of a first attar is a perfectly safe operation, as well as a simple one. Appendicectomy during the quiescent period after an attack is no safer, and is far more liable to be a difficult operation. Convalescence is prolonged. The expectant treatment of a medium attack is unsafe and unreliable. Further attacks are almost certain to occur, and operation is called for in the long run - but the operation after several attacks is attended by difficulties and dangers which are not present in an operation during the first attack. The questions set down in the Preface may therefore be answered thus: - Definite recognisable appendicitis should be transferred entirely to the domain of surgery. Appendicectomy should not however be left to the specialist. When done at the right time it is a simple operation which can and should be performed by every medical ractitioner. Appendicitis should always be treated surgically except under circumstances where extraneous considerations make the operation a greater risk than the disase. The present mortality of the disease could be firiensely reduced were all cases operated on as soon as he condition was diagnosed. Under these circumstances he mortality should not exceed 2 -3 per cent. The resent mortality of the disease being from 7 to 10 er cent in all cases. The one rule of treatment should be that directly appendicitis is diagnosed, an operation should be performed at the earliest possible moment

Laser communication system for controlling several functions at a location remote to the laser

A multichannel laser remote control system is described. The system is used in areas where radio frequency, acoustic, and hardware control systems are unsatisfactory or prohibited and where line of sight is unobstructed. A modulated continuous wave helium-neon laser is used as the transmitter and a 360 degree light collector serves as the antenna at the receiver