28 research outputs found
Autonomous oil flow generated by self-oscillating polymer gels
Get PDFThe previously reported gel and polymer actuators require external inputs, such as batteries, circuits, electronic circuits, etc., compared with autonomous motions produced by the living organisms. To realize the spontaneous motions, here, we propose to integrate a power supply, actuators, and control into a single-component self-oscillating hydrogel. We demonstrate self-actuating gel pumps driven by the oscillatory Belousov-Zhabotinsky (BZ) reaction without electronic components. We have developed the volume oscillation of gels synchronized with the BZ reaction (BZ gel). Since the self-actuating gel pumps are driven by chemo-mechanical energy from BZ gels, the self-actuating gel pumps don't require complex wiring designs, energy supply, and assembling. The mechanical work generated by BZ gels is extremely small. We formulated the thermodynamic cycle of BZ gels and maximized mechanical work. We found that pre-stretched BZ gel shows larger mechanical works. We physically separated the BZ gels and working fluid to create practical pumps. By using optimizing mechanical generated by BZ gels, we demonstrated the self-actuating gel pumps that transfer mechanical work through a stretchable elastomer membrane
ビザンティン聖堂壁画における預言者像：形、場、意味
No full textギリシア北部、マケドニア地方のヴェリアにある救世主キリスト復活聖堂（以下、キリスト聖堂と略す）は、14世紀初頭に建てられた単廊式のバシリカ小聖堂で、内部に画家カリエルギスによる創建当初からのフレスコを有する。身廊の壁面は三段の帯状に分割され、上段に新約の諸場面、中断に預言者や四福音書記者、諸聖人の胸像を含むメダイヨン、下段に修道士や軍人聖人などの全身像が描かれる。また、東壁のアブシスのコンクに立像の聖母子と二天使、コンク下部に四人の教父が配される。東壁最上段の破風状区画には「インマヌエルのキリスト」のメダイヨンを支える二天使と、旧約の王ダヴィデとソロモンが表され、正対する西壁の破風状区画にはどっしりとした体躯のヨアキムとアンナが描かれる。筆者は現在、このような装飾プログラムを有するキリスト聖堂の壁画について、特に中断のメダイヨンにおいて巻物を広げて左右を仰ぎ見る旧約の預言者像に注目して考察を進めているが、その描かれ方や構図上の特徴を明らかにするには、その前に、広くビザンティン聖堂一般において旧約の預言者がどのように表されているのかを把握しておかなければならない
An experience with augmentation sigmoid cystoplasty for urinary incontinence caused by sacral agenesis: a case report
Get PDF26歳男, 尿失禁を主訴とした仙骨形成不全に対して, S状結腸を用いて膀胱拡大術を施行し, 尿失禁の改善をみたSacral agenesis is an uncommon disease. About 50 cases have been reported in Japan since 1929. Neurogenic bladder is often accompanied with the disease. The patient was a 26-year-old man who had suffered from persistent urinary incontinence since his childhood. Kidney-ureter-bladder (KUB) revealed Type IV sacral agenesis according to the classification by Renshaw. The upper urinary tract remained normal. Urodynamics study showed a low compliance bladder with low urethral pressure. Pharmacotherapy failed to improve his continence. Augmentation sigmoid-cystoplasty was undertaken to enlarge vesical capacity and it has successfully overcome his urinary incontinence. Clinical aspects of sacral agenesis are discussed focusing on urological problems
Loosening phenomenon on thin plates bolted joint due to offset load
No full textIn this study, the new loosening behavior was discovered and investigated when offset loads were repeatedly applied to both ends of a bolted joint initially tightened to a thin plate made of high-tensile steel. In the experiments, the impact of offset distance on reduction of clamp force was investigated through multiple applications of symmetric offset axial load to the bolted joint assembly. The experimental results showed that even a slight offset load reduced the clamp force, and the larger the offset distance, the greater the reduction of the clamp force. It was also found that the decrease in clamp force depends not on the number of times the offset load is applied but on the magnitude of the offset load. Until now even if the thin plate bolted joint was subjected to an offset load, as long the plates do not deform significantly due to plastic deformation, it has been generally recognized that the clamp force is not reduced. This loosening phenomenon is new and its mechanism has not been elucidated yet. In order to clarify the mechanism that may lower the clamp force, this study conducted FE analysis using a simplified model of a bolted joint. In the FE model, the bolt and nut are considered as a single unit and the effect of slippage between the thread surfaces and the effect of plastic deformation is ignored by using elastic analysis. The results of the FE analysis showed that the main factor causing the reduction in clamp force was slippage between the thin plates to be joined, which was caused by offset load, and that the slippage didn't return to the original position resulting in the reduction in clamp force
OS0802 Influence of Wheel Nut Configuration of Wheel Hub Bolt on Transverse Fatigue Characteristics
No full text
A randomized study of prophylactic intravesical instillation of pirarubicin (THP) prior to transurethral resection of superficial bladder cancer
Get PDF原発性表在性膀胱腫瘍で移行上皮癌の症例63例を, ピラルビシン(THP)注入群30例と対照群33例に無作為に分け, 経尿道的膀胱腫瘍切除術(TUR)前膀胱内注入療法の効果について比較検討した.その結果, THP注入群中1例でCRを得た.Kaplan-Meier法による再発率の検討では, THP注入群で再発抑制傾向を認め, 腫瘍径1cm以上の例(THP注入群16例, 対照群20例)では, THP注入群は非再発期間が有意に長かった.単発症例(THP注入群13例, 対照群11例)では, THP注入群は再発期間が長い傾向を認めた.異型度別ではgrade 1とgrade 2の症例(THP注入群24例, 対照群26例)ではTHP注入群で再発抑制期間が長い傾向を認めた.以上より, THP注入療法は径1cm以上, 単発症例, grade 1とgrade 2の腫瘍では再発予防の効果があると考えられたA prospective randomized study was conducted to evaluate the efficacy of prophylactic intravesical instillation of pirarubicin (THP) prior to transurethral resection (TUR) of superficial bladder cancer. A total of 63 patients were randomized into two groups, the THP group and the control group. In the THP group, 30 mg of THP dissolved in 50 ml saline was administered 4 times intravesically for 4 consecutive days before TUR. In the control group, no instillation was performed before TUR. The patients were followed by cystoscopy and urinary cytology every 3 months. The non-recurrence rates in the THP group and control group were 54.1% versus 37.6% at 1 year and 40.4% versus 26.8% at 2 years, respectively (P = 0.086). Time to recurrence for tumors larger than 1 cm was significantly longer in the THP group (P = 0.0137). Time to recurrence for single and grade 1+2 tumors tended to be longer in the THP group (P = 0.09, P = 0.079). No significant adverse effects were observed in any patient. Our findings suggest that intravesical THP instillation prior to TUR would be effective for patients with single, low grade lesions larger than 1 cm of superficial bladder cancer
507 Influences of Bearing Surface Configuration of Wheel Hub Bolt on Transverse Fatigue Characteristics
No full text
