Showing papers by "National Nuclear Energy Commission published in 1978"
TL;DR: In this paper, the first measurement of the absolute (e, 2e) five times differential cross section in coplanar symmetric conditions on He is reported and the incident energy is varied from 200 to 4000 eV in order to test different theoretical models.
51 citations
TL;DR: In this article, the authors investigated the discrepancy between published lung deposition data and the results of a two-week workshop devoted to understanding the reasons for some of these discrepancies and found that electrostatic deposition was associated with the number of charges carried by the particles and with the mean residence time of the aerosols in the respiratory tract.
31 citations
TL;DR: Both experimental data for dicentric induction, and theoretical considerations indicate the first-order polynomial as the best fitting dose--response function for cytogenetic dosimetry as applied to neutron fields.
Abstract: SummaryAn analysis of the literature shows a lack of data about basic biological parameters regarding cytogenetic dosimetry as applied to neutron fields, in the dose range below 50 rad.Human peripheral blood lymphocytes were exposed in vitro to a degraded fission neutron spectrum of mean energy 0·4 MeV. The dose-range was 0·2–50 rad delivered at a dose-rate of about 0·2 or 7 rad/min.The results were processed using a computer programme. Both experimental data for dicentric induction, and theoretical considerations indicate the first-order polynomial as the best fitting dose—response function. The implications of these results for cytogenetic dosimetry are discussed. A comparison with 250 kV X-ray data in the same range gives an r.b.e. of 18·5 ± 3·1.
20 citations
TL;DR: In this article, a total absorption particle detector is presented, which consists of a large number of "plastic flash chambers" alternated with plates of inert dense material in which the cascade showers develop.
16 citations
TL;DR: In this article, the rate of acid-base reaction between aqueous HCl and trilaurylamine (TLA) dissolved in toluene has been studied.
13 citations
TL;DR: In this article, the Navier-Stokes equations were examined in the light of new analytic solutions to the NN equations and it was found that the existing evidence does not decisively favor the picture that a solid core is formed.
Abstract: Evidence that the positive ion in liquid ^4He forms a solid core with a solid-liquid interface is examined in the light of new analytic solutions to the Navier-Stokes equations. It is found that the existing evidence does not decisively favor the picture that a solid core is formed.
11 citations
TL;DR: The disappearance of a 32 000 D chromatin protein component was observed in cells of the 7 45A “inducible” line harvested as early as 24 h after DMSO treatment, as compared with untreated 745A cells and to cells harvested 6 and 12 h afterDMSO addition to the cultures.
6 citations
5 citations
01 Jan 1978
4 citations
TL;DR: The conversion technique gives the possibility of obtaining the wanted trisomic lines, while other methods need a particular and laborious program in order to identify the extra chromosome.
Abstract: SUMMARYFour nulli-tetrasomic lines of Triticum aestivum var. Chinese Spring were backcrossed to T. durum var. Cappelli.The plants of the BC1 generation with chromosome number 2 n = 29 (ascertained by mitotic analysis of root tips) were analyzed in metaphase I in order to distinguish the real trisomic plant from the monosomic addition line due to the presence of one chromosome of the D genome. At least one trisomic plant in each BC, family was isolated.The conversion technique gives the possibility of obtaining the wanted trisomic lines, while other methods need a particular and laborious program in order to identify the extra chromosome.
3 citations
Patent•
19 May 1978TL;DR: The transmission rate of trisomy was determined for two primary trisomic types, triplo-1 and tripla-3, of the self-incompatible species Lycopersicum peruvianum and a number of diploid and trisome progenies exhibited a partial or a complete deletion of the satellited segment of chromosome 2.
Abstract: The transmission rate of trisomy was determined for two primary trisomic types, triplo-1 and triplo-3, of the self-incompatible species Lycopersicum peruvianum. Chromosome counts in somatic metaphases of root-tip squashes from 112 progeny plants showed that 8 individuals (7.2 %) were trisomic and 104 (92.8%) were diploid. The average frequency of transmission approximated 2.6% in triplo-1 and 8.6% in triplo-3. Data are presented on the karyotype and the morphological features of the 8 trisomics detected in the progenies of triplo-1 and triplo-3 and the various factors affecting the transmission rate of trisomy are discussed. The transmission rate of trisomy was also determined for the trisomic plant 269 which displayed a complete deletion of the satellited part of chromosome 2 and was characterized by ovate fruits. Out of 18 progeny plants analysed, 8 (44.4%) were trisomic and 10 (55.6%) were diploid. Cytological and morphological analyses of the 8 trisomic individuals revealed that only two of them (11.1 %) resembled the parental trisomic. A number of diploid and trisomic progenies exhibited a partial or a complete deletion of the satellited segment of chromosome 2.
Patent•
16 May 1978TL;DR: In this paper, the tracks of damage by fast neutrons are developed to the required extent and subsequently inspected for evaluating the amount of the traces of damage, and different forms of the test tubes are disclosed.
Abstract: An apparatus for the dosimetry of fast neutrons comprises one or more personal detectors in the form of test tubes made of transparent insulating material and a tank with a holder for suspending said test tubes in an upright position within the tank all at the same level. After exposure of said test tubes to radiation of fast neutrons, they are placed in the tank and filled with an electrolyte into which an electrode is immersed. The tank also is filled with the same liquid up to the same level as the test tubes and an electrode is immersed also into the liquid within the tank. The electrodes within the test tubes are collectively connected to one terminal of a high voltage alternating or pulsating function generator of which the other terminal connects with the electrode within the tank. The tracks of damage by said neutrons are thus developed to the required extent and subsequently inspected for evaluating the amount of the traces of damage. Different forms of the test tubes are disclosed.
TL;DR: In this article, the present status, the progress envisaged for the near future, the milestones to be reached and the possible options are discussed with particular reference to the magnet development required.
Abstract: As of to day the largest effor in the field of thermonuclear fusion is devoted to the magnetic confinement approach. Within this approach, the Tokamak line which has received large attention since 1970, is being given the largest possible support, to reach ignition in the 1980's. This goal is being approached with experiments sufficiently large to accomodate plasma currents beyond 3 MA but with a variety of magnetic and geometrical parameters. An optimization of these parameters would imply the knowledge of reliable scaling laws on confinement and heating of plasmas: unfortunately the present status of the experimental research does not offer a clear understanding of toroidally confined plasmas beyond 1÷2 keV of temperature or beyond 50 ms of confinement time. In the paper the present status, the progress envisaged for the near future, the milestones to be reached and the possible options are discussed with particular reference to the magnet development required.