Isamu Yoshitake

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Long-term outcomes of patients undergoing extracorporeal membrane oxygenation for refractory postcardiotomy cardiogenic shock

Surgery Today (2012)

Satoshi Unosawa Akira Sezai Mitsumasa Hata Kin‐ichi Nakata Isamu Yoshitake

Refractory (planetary science)

10.1007/s00595-012-0322-6

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Citations (61)

Pulmonary Embolism with Myomatous Erythrocytosis Syndrome and Extreme Obesity

The Thoracic and Cardiovascular Surgeon (2009)

Satoshi Unosawa Masatoshi Hata Akira Sezai Tetsuya Niino Isamu Yoshitake

We here report a case of a 53-year-old woman requiring pulmonary embolectomy for acute massive pulmonary embolism caused by a huge uterine myoma compressing veins in the pelvis and extreme obesity. She was also diagnosed as having myomatous erythrocytosis syndrome, a rare disease associated with secondary polycythemia. The polycythemia improved after a hysterectomy which was performed after pulmonary embolectomy.

Embolectomy

10.1055/s-2008-1038880

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Citations (6)

Durability of Steam-Cured Concrete Incorporating a High-Resistance Admixture for Chloride Attack

Journal of the Society of Materials Science Japan (2017)

Koichiro Yamato Takeo ISHIDA Noritsugu Yamaji Shunji Tsugo Isamu Yoshitake

Since the Great East Japan Earthquake, many concrete seawalls for reconstruction and tsunami prevention are being built. Concrete having high resistance of chloride attack has been demanded for such coastal structures. To reduce future maintenance cost, concrete structures must be highly durable to environmental effects in addition to the chloride attack resistance. The authors have developed a pozzolanic admixture with excellent resistance to chloride attack as well as excellent general durability. The admixture is a mineral fine powder with a BET specific surface area of 10 m2/g of higher. The pozzolanic material (general mixture of 20-40 kg/m3) can be used as an alternative binder of Portland cement like fly-ash. The admixture is useable even in precast concrete factories having fewer storage facilities such as extra silos. The study focuses on properties of steam-cured concrete to consider the use of admixture in such precast concrete production. The experimental study examined various properties of the concrete incorporating the admixture, such as the chloride penetration resistance; compressive strength; dry shrinkage; carbonation; sulfate resistance, and freeze-thaw resistance. Pore distribution of the concrete was also investigated to confirm the effect of the powder material. The test result confirms the excellent higher resistance to chloride penetration of the concrete. In addition, the study presents that the durability of the concrete is comparable with or higher than that of conventional concrete without the admixture.

Precast concrete

Shrinkage

Pozzolanic reaction

Pozzolanic activity

Properties of concrete

10.2472/jsms.66.328

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Citations (1)

DEVELOPMENT PROCESS OF CONSTRUCTION TECHNIQUE IN NEW PRE-LINING SUPPORT METHOD FOR APPLICATION EXPANSION

Doboku Gakkai Ronbunshuu F (2006)

寺内伸谷口裕史宮地明彦中田雅博 Isamu Yoshitake

切削即時充填式プレライニング工法(New PLS工法)は,都市部における新しいトンネル構築工法として注目されつつある.本論文では,New PLS工法の技術開発において,「基本的機構確認段階」「実用性確認段階」「適用性拡大段階」の各実証(現場適用)段階での成果整理~課題抽出~対策立案を一連の流れとして示し,今後の本工法を用いたトンネル施工の基礎資料とすべく,プレライニング機の仕様や特殊急硬性コンクリートの配合などに関する知見を述べる.また,本開発プロセスを土木施工技術開発の一典型例として,現場適用からの知見の重要性を示す.

10.2208/jscejf.62.41

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Cardiac Angiosarcoma with Cardiac Tamponade Diagnosed as a Ruptured Aneurysm of the Sinus Valsalva

Japanese Journal of Clinical Oncology (2009)

Isamu Yoshitake Masahiro Hata Akira Sezai Tetsuya Niino Satoshi Unosawa

Primary cardiac angiosarcoma is a rare, diagnostically elusive disease with a poor prognosis. In this report, we describe the case of a 56-year-old woman with a right atrial angiosarcoma. The patient presented with impending cardiac tamponade caused by right atrial perforation, but was misdiagnosed as a ruptured aneurysm of the sinus valsalva based on findings of a continuous murmur and an aorta to right atrium shunt by echocardiography. In the emergent operation that ensued, we found a right atrial perforation and a right coronary artery fistula to the right atrium. Coronary artery fistula is a rare complication of primary cardiac angiosarcoma, and a continuous murmur is also extremely rare as a clinical finding of angiosarcoma. We report the case and review the literature.

Hemangiosarcoma

10.1093/jjco/hyp044

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Citations (17)

COMPARATIVE STUDY ON TUNNEL LINING CONCRETE STRENGTHENED WITH CARBON-FIBER COMPOSITE CABLES AND SHEETS

Proceedings of International Structural Engineering and Construction (2023)

Isamu Yoshitake Shingo Morimoto Shinji Ueno Hisahi Hayashi

Most lining concretes of road tunnels in Japan have been gradually deteriorated by aging and various environmental effects. The study focuses on a strengthening system for tunnel lining concrete (TLC) subjected to external forces. Carbon fiber (CF) sheets are often used in TLC for preventing concrete exfoliation. The strengthening effect of CF sheet for TLC was not sufficiently known. The experimental study conducted a mock-up loading test to examine failure mode and load-capacity of the TLC model bonding CF sheet. In addition, the study prepared TLC models strengthened with near-surface mounted (NSM) technique using carbon-fiber composite cables (CFCC). The strengthening effects of CF sheet and NSM-CFCC were quantified and compared via the mock-up loading test. The experimental study revealed that the TLC model bonding CF sheet failed by intermediate-crack-induced debonding at around 100 kN, and the load carrying capacity was almost equivalent to the capacity of non-strengthened TLC model. On the other hand, the NSM-CFCC strengthened TLC model indicated higher ductility after concrete cracking and superior load capacity. The experimental study confirmed the NSM-CFCC as an effective strengthening system for TLC members.

Ductility (Earth science)

Exfoliation joint

Carbon fiber composite

10.14455/isec.2023.10(1).str-13

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Fundamental Experiment on Estimation Method for Cement Hydration by Using a Hyperspectral Camera

Journal of the Society of Materials Science Japan (2024)

Hikaru Aono Simin Zhai Sadatoshi OHMORI Momoka HARA Isamu Yoshitake

Concrete form of tunnel lining is generally demolded earlier than other concrete structures. In particular, the demolding of ceiling form of tunnel lining is approximately 12-20 hours of concrete age. Note is that such early strength of concrete is hardly examined at site. Hence, a proper strength-estimation of tunnel lining concrete at early age is needed to demold the concrete form. Strength development of concrete at early age must be strongly related to cement hydration process. To develop a non-destructive testing (NDT) technique evaluating concrete strength, a hyperspectral camera which can quantify cement hydration was used in this study. Hyperspectral images consist of wide-range wavelength, it can obtain invisible variations of hydrated cement compared to general red-green-blue (RGB) images. A fundamental study was conducted to examine cement hydration by using the hyperspectral camera. The study proposed a cumulative reflectance for quantitative evaluation of the hyperspectral image. The study examined the relation between the cumulative reflectance and compressive strength of hydrated cement paste. In addition, chemical reaction of alite and calcium hydroxide in the cement paste were examined to quantify the cement hydration. The fundamental test revealed that the cumulative reflectance is applicable to estimate cement hydration degree. The NDT technique using hyperspectral image has a possibility for estimating the strength of tunnel lining concrete.

10.2472/jsms.73.874

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Citations (0)

INVESTIGATION OF CRACKS IN LINING CONCRETE AND ESTIMATION ON THE EXFOLIATION OF CONCRETE PIECES

Doboku Gakkai Ronbunshu (2004)

Tetsuo Ito Koji Baba Hiromichi Shiroma Isamu Yoshitake Koji Nakagawa

本研究は, 矢板工法からNATMに至るまで, いくつかの山岳道路トンネルにおける覆エコンクリートのひび割れ調査を通じて, コンクリート片の剥落に及ぼす各種要因の整理を試みたものである. 特に, 本研究では, ひび割れ方向性を定義し, これをもとに覆工コンクリートに生じたひび割れを分類するとともに, その発生頻度や交差角度, ひび割れ幅等の調査を行った. さらに, 剥落塊の形状を調べるとともに, コンクリート老朽化の一指標となる中性化深さを調べ, 剥落危険性の評価の基礎データを示した.

Exfoliation joint

10.2208/jscej.2004.763_87

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Citations (1)

PROPOSE OF A RATIONAL INSPECTION SYSTEM OF HIGHWAY TUNNEL

Doboku Gakkai Ronbunshuu D (2007)

Nobuo Sano Koji Baba Takaaki Yamada Isamu Yoshitake Koji Nakagawa

トンネルにおける点検作業は,効率的に実施することが望まれている.高速道路トンネルにおける覆工コンクリートの詳細点検は,高所作業車を用いた近接目視と打音点検が主体となっている.本研究で提案する点検システムは,1)走行速度60km/h程度でも計測できる車両を用いて,2)覆工コンクリート表面画像の机上点検から健全度の劣るスパンを特定し,3)そのスパンに限定して従来の近接目視・打音点検を行うものである.この点検システムにより,点検技術者による現地点検回数の低減に伴う点検費用の削減,点検・調査の迅速化,安全性判断の早期化,詳細点検計画の効率的な立案などが可能となった.

10.2208/jscejd.63.391

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REDUCING BUG-HOLES ON TUNNEL LINING CONCRETE BY USING COVERING SHEETS

Proceedings of International Structural Engineering and Construction (2015)

Sari Harada Tomoyuki Maeda Masayuki Hirano Isamu Yoshitake

This study focused on bug-holes on sidewalls of tunnel lining concrete. The bug-holes of lining concrete may negatively affect aesthetics and durability of NATM (New Austrian Tunneling Method) tunnels. Most bug-holes appeared on concrete surface are generated from entrapped air during consolidating concrete. In particular, the sidewall of tunnel lining is constructed with negative angles, so bug-holes are often observed on the sidewall. Seven concrete specimens were prepared to simulate conventional tunnel lining. In the experimental investigation, breathable-waterproof material sheets and permeable sheets were used. The primary experimental parameters are (a) covering-sheet materials and (b) form surfaces such as ceramic-coated steel with grooves. The study examined bug-hole distributions in the concrete specimens using the various sheets. The bug-hole distributions were quantified by using an image analysis developed in this study. The test results show that quantity of bug-holes of concrete using the sheets is lower than the quantity of concrete without sheets. It was noteworthy that the bug-holes were hardly observed in the test using the form covered with the permeable sheets.

10.14455/isec.res.2015.67

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Citations (4)