The Tea Sets in 17th Century Sites of Japan

　17世紀代、長崎では清朝からの渡来僧による寺院が次々の創建され、寺院の行事や習慣に伴う喫茶（煎茶）も伝来した。　また長崎に来住する唐人は大陸にいたころから煎茶に親しんでいたようであるので、長崎では寺院・唐人・町人を問わず煎茶が普及したらしく、市内の町屋遺跡（築町遺跡・桜町遺跡）から煎茶道具が出土している。　京都には福建省から渡来した（黄檗宗の開祖）により煎茶が伝えられた可能性があり、隠元の信者や交友関係を通じて煎茶が広まったことが分かる。　しかし、煎茶道具は貴族の御所に隣接する公家町屋敷跡からしか出土しておらず、長崎ほどの普及状況でないことが分かる。　京都に煎茶が普及するのは高遊外（賣茶翁）が煎茶の啓蒙活動を始める18世紀になってからのことである

Influence of groove shape on rolling contact fatigue of PEEK-PTFE hybrid radial bearings in dry conditions

In this study, rolling contact fatigue (RCF) tests were performed in order to investigate the effect of groove radius on the life of PEEK-PTFE hybrid radial bearings. Furthermore, solid state NMR spectroscopy was performed in order to investigate the molecular structure of PEEK. It was found that groove radius shape was related to limitations of the bearings, and the molecular structure of the PEEK was not changed by the temperature rise in this test. Furthermore, thermal failure of the PEEK was not affected by oxidation during RCF test

Impact of lymph node dissection on clinical outcomes of intrahepatic cholangiocarcinoma: Inverse probability of treatment weighting with survival analysis

Background: Lymph node metastasis (LNM) has been established as a critical risk factor for prognosis in intrahepatic cholangiocarcinoma (ICC). The clinical implications of lymph node dissection (LND) have been debated. This study aimed to clarify the prognostic impact of LND by multicenter retrospective analysis. Methods: A total of 310 ICC patients who had undergone curative resection between 2000 and 2016 were retrospectively analyzed. The prognostic impact of LND was estimated under an inverse probability of treatment weighting (IPTW) approach using propensity scores. Results: LND was performed for 224 patients (72%), with LNM pathologically confirmed in 90 patients (40%). Prognosis was poorer for patients with LNM (median survival, 16.9 months) than for those without (57.2 months; P Conclusions: LND could have a significant role to play in improving oncologic outcomes. Therapeutic LND should be implemented on the basis of tumor location and tumor advancement