<雑録>最近ノ經濟學界

The release of luteinizing hormone (LH) is driven by intermittent bursts of activity in the hypothalamic nerve centers of the brain. Luteinizing hormone again stimulates release of the male sex hormone testosterone (Te) and, via the circulating concentration of Te, the hypothalamic nerve centers are subject to a negative feedback regulation that is capable of modifying the intermittent bursts into more regular pulse trains. Bifurcation analysis of a hybrid model that attempts to integrate the intermittent bursting activity with a continuous hormone secretion has recently demonstrated a number of interesting nonlinear dynamic phenomena, including bistability and deterministic chaos. The present paper focuses on the additional complexity that arises when the time delay in the continuous part of the model exceeds the typical bursting interval of the feedback. Under these conditions, the hybrid model is capable of displaying quasiperiodicity and border collisions as well as multistability and hidden attractors

Analysis of the spectrum of the Pd I-like xenon (Xe IX) and extended interpretation of the Sb VI, Te VII and I VIII spectra

The spectrum of Xe IX has been observed using a fast capillary discharge with inductive storage as a light source and the normal incidence 6.65m spectrograph at Troitsk. This follows extended observations of vacuum spark spectra of Sb VI, Te VII and I VIII at Troitsk and at Meudon. Theoretical studies of [MATH] ([MATH]) configurations by means of the Cowan codes and by generalized-least-squares fits along the Pd I sequence lead to classify 82 lines as 5-5 transitions of Xe IX

Spectrum of five times ionized tin (Sn VI) in the vacuum UV region

The spectrum of tin excited in a vacuum spark was recorded in the region 500 – 1500 Å on the 6.65 m normal incidence spectrograph. 110 lines of the 4d85p – 4d85d transitions in the Sn5+ ion in the region 680 – 850 Å have been identified and 52 energy levels of the 4d85d configuration have been established