The effects of fluid inertia on the dynamic behavior of oil film journal bearings are theoretically investigated. The dynamic oil film forces considering the combined effects of turbulence and fluid inertia are analytically obtained under the short bearing assumption. Based on the linearized analysis, the whirl onset velocity for a balanced rigid rotor supported horizontally in the oil film journal bearings are determined initially in the case of the length-to-diameter ratio of λ = 0.5 for Reynolds numbers of Re = 2750, 4580, and 5500. Moreover, the nonlinear equations of motion for the rotor are solved by the improved Euler’s method, and the relations between the transient journal motion and the pressure distribution corresponding to the above Reynolds numbers are examined. It is found that the fluid inertia significantly affects the dynamic behavior of turbulent journal bearings under certain operating conditions.

Aim Small‐for‐gestational‐age (SGA) status has negative health consequences in neonates and later life. Low socioeconomic status (SES) is a reported risk factor for adverse birth outcomes, such as SGA and preterm birth (PTB). The present study investigated whether maternal SES is associated with adverse outcomes in Japanese pregnant women. Methods Retrospective data were collected for 1970 Japanese women with singleton pregnancies who delivered between January 2007 and December 2011 at a single center: low SES group (n = 197); and controls (n = 1773). Low SES was defined according to the criteria of the Japanese pregnant‐childbirth hospitalization support policy system. Results The low SES group included a significantly higher proportion of young women, women with single marital status, greater parity, pre‐pregnancy smoking and a lack of regular employment (P < 0.001, respectively). The crude odds ratio (OR) for the association between low maternal SES and SGA was 1.80 (95% confidence interval [CI] 1.15–2.82, P = 0.010). After adjustment for baseline maternal age, parity, body mass index, smoking and gestational weight gain, the adjusted OR for the association between low maternal SES and SGA was 1.92 (95% CI 1.17–3.17, P = 0.010). No significant association was found between maternal SES and PTB. Conclusion The present results suggest that low maternal SES is associated with SGA births in the Japanese population. Mitigation of low maternal SES could be urgent public health to prevent disadvantage birth outcome.

Serous tubal intraepithelial carcinoma (STIC) has attracted attention as a precursor lesion of high‐grade serous carcinoma (HGSC) of the ovary. We report the rare case of a woman in whom adenocarcinoma cells were detected in cervical smears and demonstrated to be derived from STIC in the fimbria. The patient was a 48‐year‐old woman, in whom cervical smears contained adenocarcinoma cells, but cervical conization did not reveal adenocarcinoma. Because the post‐conization smears again demonstrated adenocarcinoma cells, hysterectomy with bilateral salpingectomy was performed 16 months after the first detection of adenocarcinoma cells in cervical smears. Histopathological examination demonstrated STIC in the fimbria of the left fallopian tube. Bilateral ovaries appeared grossly normal at that time, but oophorectomy, which was performed 3 months later, disclosed HGSC involving the surface of bilateral ovaries. Detection of carcinoma cells from STIC in cervical smears is of marked significance for the management of patients, and we should keep in mind the possibility that adenocarcinoma cells in cervical smears are derived from STIC. The postoperative outcome of patients with STIC is considered generally favorable, and the clinical course of the present patient, in whom HGSC involving the bilateral ovaries was found shortly after salpingectomy, is exceptional.

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