No abstract available

[en] Bellows are employed as useful mechanical elements with their flexibility and imperviousness to liquid and gas in the system in which such chemically active substances as sodium are handled. Since the early time of development of Japanese LMFBR, bellows have been used e.g. for the shaft seal of small sodium valves. Bellows are employed in the fast experimental reactor JOYO which is now in operation and the fast prototype reactor MONJU whose design program is in final stage at the following parts: control rod drive mechanism; intermediate heat exchanger; small valve; mechanical penetration assembly of the containment boundary; outer piping of the double-walled primary system (for JOYO only). In addition, the application of bellows as thermal expansion joint to the main piping system is under consideration for future FBRs. This paper outlines the research and development work on bellows for FBR use in Japan. (author)

[en] The first I-band CCD photometry of the AM Her candidate E1013-477 in a faint state has been obtained. There is no evidence for any periodicity near the claimed 103.4 min orbital period; however, significant variability on a time scale of about 6.4 hrs and a possible period of 71.1 min are observed. It is proposed that E1013-477 may be an intermediate polar system. This interpretation is also consistent with previous observations. 21 references

[en] We have reviewed 37 patients with primary orbital lymphoma, using the Ann Arbor criteria and the Working Formulation and its modification. Thirty-one patients had stage I disease, four stage II, one stage III and one stage IV. The male to female ratio was 2.7:1. There were 34 low-grade tumours (including 24 mantle zone) and three intermediate-grade. Patients were divided into three groups according to their primary treatment. Group 1: radiotherapy (17 cases); Group 2: surgery alone (13 cases); Group 3: chemotherapy (seven cases). Patients were followed up from 5 months to 24.3 years, with a mean and median of 7.6 and 6.2 years, respectively. The BMDP software package was used for survival estimation (Kaplan-Meier) and determination of prognostic variable (univariate Cox regression). Local relapse-free survival at 10 years was 100% in Group 1, 0% in Group 2 and 42% in Group 3 with a statistically significant difference (p < 0.01) in favour of radiotherapy. Statistically significant good prognostic features were: complete remission (CR) in response to initial treatment, primary radiotherapy and older age. For stage I cases, there was no difference in distant relapse-free survival in the three groups. The overall cause-specific survival for stage I patients at 10 years was 100% for each group and at 20 years was 100, 67 and 0% for Group 1, 2 and 3. The difference between the primary radiotherapy and chemotherapy-treated groups was significant at the p = 0.08 level. Statistically significant prognostic factors were early stage, low-grade histology and primary radiotherapy. In one patient, ptosis and diplopia appeared after surgery. One case of glaucoma required enucleation, one patient suffered severe dry eye syndrome. All patients ((11(11))) in whom the lens received direct radiation developed cataracts of different degrees if follow-up was long enough. Cataract formation was prevented by adequate lens shielding. One patient in CR from a stage I low-grade tumour died from chemotherapy-induced marrow aplasia. Primary orbital lymphoma is an indolent, usually stage I disease, showing low to intermediate-grade histology. After biopsy the best treatment is 30 (low-grade) to 40 Gy (intermediate-grade) carefully planned, lens-sparing megavoltage radiation without adjuvant chemotherapy

[en] Sodium valves for FBR are required to isolate sodium side from the atmosphere completely throughout its lifetime because of preventing sodium leakage with or without radioactivity. A great number of sodium valves have been used in FBR test facilities at O-arai Engineering Center of PNC and many troubles have occurred through their operational experience. Most of the cause of the troubles are the bellows failure followed by sodium leakage. A research and development program on bellows was started to clarify many uncertain factors of its performance and to establish the feasibility of bellows used in sodium. In this program Small Bellows Test Loop was built to perform low cycle fatigue tests on bellows under high temperature conditions. In this report some examples of the investigation of failed bellows occurred at O-arai Engineering Center of PNC are described. The research and development program on bellows is also explained with the summary of recent test results. (author)

[en] In an earlier paper the spectroscopic detection was reported of the secondaries in the three AM Her type systems, CW1103+254, PG1550+191 and E2003+225. In this paper, high-resolution spectrophotometry of these stars is presented in the wavelength region lambda lambda 7550-8850. In all three cases, the radial velocity variation of the second star has been detected using the Na I doublet at lambda lambda 8183-94. Combined with values for each system's inclination estimated from polarimetry, constraints on the white dwarf masses are derived. The average of our best estimates for the white dwarf masses in these systems and AM Her itself is approx.0.6 solar masses, essentially coincident with the masses of isolated white dwarfs. (author)

[en] Full text: Recent progress in the development of high-resolution electron spectrometers combined with highly monochromatized undulator radiation allows us to obtain the information about vibrational structure in core excited states [1, 2]. In the present study, vibrational-resolved C 1s spectra of ethylene on the Si(100)(2x1) surface was investigated by high resolution photoelectron spectroscopy at PF BL-16B in KEK. Analysis of the vibrational structure reveals that the excitation process is a Frank-Condon process and the C-H bond becomes shorter upon core ionization. In the spectra, the vibrational splittings of C 1s ionized state are very similar to those in the ground state. After the C 1s ionization, the charge-transfer screening from the silicon to the Si-C bond may partially neutralize the core ionized C atom. As a result, the blue shift of the C-H bond shortening and the red shift by this screening may be cancelled

[en] This paper reports low-resolution spectrophotometry in the region 6000-9500 A, of three AM Her-type systems, with the Isaac Newton Telescope, and UKIRT photometry of two of them. PG1550+191 (MR Ser) was found to be in a low state; the others, CW1103+254 (ST LMi) and E2003+225(QQ Vul), were not. In all three cases spectral features characteristic of late-M stars were detected. We also report on the infrared photometry of two of the systems, enabling us to refine the distance estimates. (author)

[en] Time resolved spectrophotometry of the AM Her-type system 2A 0311-227 (=EF Eri) has been obtained in 1983 February. The velocities of the complex emission-line profiles are deduced from multicomponent fits and three distinct emitting regions are identified, although their location within the system is unclear. The overall behaviour of 2A 0311-227 is compared with the observations of previous authors in 1979 indicating that much of the structure is highly stable and therefore a permanent feature of the mass-transfer process. (author)

[en] Archival Ariel V data have been analysed to search for the proposed period of X1820-303. A modulation with a period of 685.02+-0.54 s (2σ confidence) and a peak-to-peak amplitude of 2.2 per cent is detected from the longest data set. Combining this measurement with the EXOSAT results the upper limit on the period derivative is found to be 0.28 s yr^-1 (90 per cent confidence). The stability of the period over a time-scale of 10 years suggests that the period is orbital in nature. (author)