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Sinha, S.,Kim, D.I.,Fleury, E.,Suwas, S. Elsevier Sequoia 2015 Materials science & engineering. properties, micro Vol.626 No.-
The present investigation deals with grain boundary engineering of a modified austenitic stainless steel to obtain a material with enhanced properties. Three types of processing that are generally in agreement with the principles of grain boundary engineering were carried out. The parameters for each of the processing routes were fine-tuned and optimized. The as-processed samples were characterized for microstructure and texture. The influence of processing on properties was estimated by evaluating the room temperature mechanical properties through micro-tensile tests. It was possible to obtain remarkably high fractions of CSL boundaries in certain samples. The results of the micro-tensile tests indicate that the grain boundary engineered samples exhibited higher ductility than the conventionally processed samples. The investigation provides a detailed account of the approach to be adopted for GBE processing of this grade of steel.
Biswas, S.,Kim, D.I.,Suwas, S. Elsevier Sequoia 2012 Materials science & engineering. properties, micro Vol.550 No.-
In the present study, asymmetric rolling was carried out for incorporating a shear component during the rolling at different temperatures, and was compared with conventional (symmetric) rolling. The microstructures were investigated using electron back-scatter diffraction (EBSD). The strain incorporated was compared with the help of grain orientation spread (GOS). GOS was eventually used as a criterion to partition the microstructure for separating the deformed and the dynamically recrystallized (DRX) grains. The texture of the partitioned DRX grains was shifted by ~30<SUP>o</SUP> along the c-axis from the deformed grains. The mechanism of dynamic recrystallization (DRX) has been identified as continuous dynamic recovery and recrystallization (CDRR). The partitioned deformed grains for the higher temperature rolled specimens exhibited a texture similar to the room temperature rolled specimen. The asymmetric rolling introduces a shear component which shifts the texture fibre by ~5-10<SUP>o</SUP> from the conventional rolling texture. This led to an increase in ductility with little compromise on strength.
Beausir, Benoî,t,Biswas, Somjeet,Kim, Dong Ik,Tó,th, Lá,szló,S.,Suwas, Satyam Elsevier 2009 Acta materialia Vol.57 No.17
<P><B>Abstract</B></P><P>Asymmetric rolling of commercially pure magnesium was carried out at three different temperatures: room temperature, 200°C and 350°C. Systematic analysis of microstructures, grain size distributions, texture and misorientation distributions were performed using electron backscattered diffraction in a field emission gun scanning electron microscope. The results were compared with conventional (symmetric) rolling carried out under the same conditions of temperature and strain rate. Simulations of deformation texture evolution were performed using the viscoplastic self-consistent polycrystal plasticity model. The main trends of texture evolution are faithfully reproduced by the simulations for the tests at room temperature. The deviations that appear for the textures obtained at high temperature can be explained by the occurrence of dynamic recrystallization. Finally, the mechanisms of texture evolution in magnesium during asymmetric and symmetric rolling are explained with the help of ideal orientations, grain velocity fields and divergence maps displayed in orientation space.</P>
Tumor microenvironment and radioresistance
Suwa Tatsuya,Kobayashi Minoru,Nam Jin-Min,Harada Hiroshi 생화학분자생물학회 2021 Experimental and molecular medicine Vol.53 No.-
Metastasis is not the result of a random event, as cancer cells can sustain and proliferate actively only in a suitable tissue microenvironment and then form metastases. Since Dr. Stephen Paget in the United Kingdom proposed the seed and soil hypothesis of cancer metastasis based on the analogy that plant seeds germinate and grow only in appropriate soil, considerable attention has focused on both extracellular environmental factors that affect the growth of cancer cells and the tissue structure that influences the microenvironment. Malignant tumor tissues consist of not only cancer cells but also a wide variety of other cells responsible for the inflammatory response, formation of blood vessels, immune response, and support of the tumor tissue architecture, forming a complex cellular society. It is also known that the amounts of oxygen and nutrients supplied to each cell differ depending on the distance from tumor blood vessels in tumor tissue. Here, we provide an overview of the tumor microenvironment and characteristics of tumor tissues, both of which affect the malignant phenotypes and radioresistance of cancer cells, focusing on the following keywords: diversity of oxygen and nutrient microenvironment in tumor tissue, inflammation, immunity, and tumor vasculature.
Suwa, Tomone,Nabara, Yoshihiro,Ozeki, Hidemasa,Hemmi, Tsutomu,Isono, Takaaki,Takahashi, Yoshikazu,Kawano, Katsumi,Oshikiri, Masayuki,Tsutsumi, Fumiaki,Shibutani, Kazuyuki,Nunoya, Yoshihiko,Okuno, Kiyo Institute of Electrical and Electronics Engineers 2015 IEEE transactions on applied superconductivity Vol.25 No.3
<P>Japan Atomic Energy Agency (JAEA) is procuring 100% of the ITER Central Solenoid (CS) conductors. The CS conductor is required to maintain the performance under 60000 pulsed electromagnetic cycles. JAEA tested two internal-tin Nb<SUB>3</SUB>Sn conductors for the CS at the SULTAN test facility. As a result of destructive examination, the twist pitches of both of the cables satisfied requirements of the ITER Organization (IO). The current sharing temperatures T<SUB>cs</SUB> of each sample were 6.6 and 6.8 K before cyclic operation, and the T<SUB>cs</SUB> values were 6.8 and 6.9 K after 9700 electromagnetic cycles, including three warm-up/cooldowns, respectively. The T<SUB>cs</SUB> performance of both samples satisfied the IO requirement. The ac losses of CSKO1-C and CSKO1-D were approximately half of typical bronze-route CS conductors at 2 and 9 T. The ac loss at 45.1 kA after the cycling was 1.5 times higher than that without the transport current. An almost constant strain of the jacket was observed after the test as a result of the residual strain measurement. Therefore, the deformation of the cable might have been homogeneous along the conductor axis. Because of the higher T<SUB>cs</SUB> of CSKO1-D than CSKO1-C, JAEA started the manufacturing of the CS conductor with the same specification as CSKO1-D.</P>
Application of Wavelet Spectrum Analysis to Horizontal Structure of Sea Surface Temperature
Suwa, Jun 대한원격탐사학회 1998 International Symposium on Remote Sensing Vol.14 No.1
Two-dimensional wavelet spectrum analysis is applied to Advanced Very High Resolution Radiometer (AVHRR) images from the NOAA meteorological satellites in the area around Japan to unfold the horizontal structure of SST into space and scale (wavenumber), which can yield localized space-wavenumber information. The results reveal significantly new and previously unexplored insights on horizontal structure of sea surface temperature, which cannot be revealed using a traditional Fourier transform approach.
Notes on Korean Anthomyiidae, with descriptions of two new species and one new subspecies(Diptera)
SUWA, MASAAKI 韓國自然史博物學會 1983 生物과 自然 Vol.13 No.2
Forty-three species of Anthomyiidae are recorded from Korea. Two species and one subspecies are described as new to science, namely Chirosia inspinata, Phorbia odaesana and Delia takizawai koreana. Twently-seven others are new to Korea.
Proteinaceous inhibitors of phospholipase A₂ purified from inflammatory sites in rats
SUWA, YORIMAS,KUDO, ICHIRO,IMAIZUMI, ATSUSHI,OKADA, MASAHIRO,KAMIMURA, TAKASHI,SUZUKI, YOJI,CHANG, HYEUN WOOK,HARA, SHUNTARO,INOUE, KEIZO 영남대학교 약품개발연구소 1991 영남대학교 약품개발연구소 연구업적집 Vol.1 No.-
We have purified two phospholipase A₂ inhibitory proteins (37 and 33 kDa) from peritoneal fluid of dexamethasone-treated rats. The extracellular phospholipase A₂ round in inflammatory sites differed from the exocrine phospholipase A₂ in susceptibility to these endogenous inhibitors; both proteins inhibited the activity of the extracellular phospholipase A₂ purified from sites of inflammation but did not affect appreciably the activity of either porcine pancreatic or Naja naja venom phospholipase A₂. The amino acid sequence of the NH₂-terminal portion of the purified proteins did not resemble that of lipocortins so far reported, but it was almost identical to that of parts of human or mouse complement component C3. These findings may indicate that degraded products of C3 are involved in the regulation of activity of a class of mammalian phospholipase A₂.