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Experimental study on self-healing effect of FRCC with PVA fibers and additives
Tomoya Nishiwaki 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.S1
It has been confirmed that some types of fiber-reinforced cementitious composites (FRCCs), particularly the ones that use synthetic fibers (e.g. polyvinyl alcohol; PVA), have a great capability to self-heal the cracks by some previous research. In this study, self-healing capability of FRCCs with additives such as silica fume and excess PVA dosage was tested. Two experimental studies were carried out to evaluate the self-healing capability with different levels of cracks. As to Test I, freeze/ thaw cycles (according to the JIS A 1148 (ASTM C 666-A) method) was subjected to specimens to introduce micro cracks. As to Test II, visible cracks up to 500 µm width were generated by tensile loading test. The damaged FRCC specimens were exposed to several conditions to induce self-healing curing. In the case of Test I (freeze/thaw cycles), the self-healing capability was evaluated by measuring the number of cracks, relative dynamic Young’s-modulus (RDYM) and pore structures. In the case of Test II (tensile loading test), the coefficient of watertightness was measured every certain period of time. Upon exposing to the curing conditions after the damage, the results showed a recovery by means of self-healing effect. In Test I, all of the cracks and RDYM recovered due to the densification of microstructures and filling up of the cracks. In Test II, the recovery of the coefficient of watertightness was confirmed after self-healing curing, which was proportionally consistent during the immersion in water. Moreover, the results showed that an admixture of PVA could be expected to enhance the selfhealing capability of cracks without causing any negative impact on the properties of FRCC.
Multiferroic Phase Transitions of Triangular-Lattice-Antiferromagnet RbCoBr3
Yoichi Nishiwaki,Katsunori Iio,Toshiharu Mitsui 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
An intensive study of dielectric and magnetic properties in RbCoBr3 was performed to confrm the previously observed simultaneous onset of ferroelectric and antiferromagnetic orderings just at the antiferromagnetic transition point. The real part of the dielectric constant as a function of temperature exhibits an in ection point at 37.2 K and two anomalous round and sharp peaks at 32 K and 9.0 K, respectively. The pyroelectric charge measurement shows an anomaly at about 9.0 K, and conrmed the presence of a reversible spontaneous polarization. From the impurity eect of non-magnetic Mg2+ on the magnetic susceptibility and the dielectric constant, the Neel temperature was found to be reduced in accordance with a lowering of the ferroelectric phase transition point. Moreover, the broad peak around 32 K of the pure sample splits into two sharp peaks through the impurity doping.
「체육사」가 지니는 근본 문제 : 연구 대상인 「체육」을 어떻게 파악할 것인가
미쯔루,노희덕 師範大學 體育硏究所 1995 서울大學校 體育硏究所論集 Vol.16 No.2
This study concerns the historical research of physical education. However, before this kind of research can be undertaken, the concept of 'physical education' must be clearly identified. This must be done from a categorical viewpoint. The definition of 'physical education' varies from scholar to scholar, but the meaning of the category we call 'concept' cannot differ. This is where we find the genesis of the confusion regarding the content of that field called 'the history of physical education' and highlights the limitations and lack of clearly delineated definitions of the field. Therefore, the lack of clarity as to the nature of physical education itself becomes a lack of clarity as to the nature of the history of physical education, demonstrating the need for the former concept to be clearly identified. In this study, physical education will be understood the same as the specific concept "education". Education will be understood as the mutual interaction between the "teacher", the "learner", and that being "learned". Because physical education belongs to this specific concept it is classified as a relational concept. The objective of education is the operation of a process of humanizing the biological animal which is man. Physical education, as education is responsible for the physical dimension of the process of humanization and therefore, must not be confused with 'sport' or 'educative physical movement' as these are basically different categories. In the process of clarifying the structure of physical education and forming a formal definition, we will be able to establish a clear direction for the historical study of physical education.
니시와키 미쯔루 師範大學 體育硏究所 1997 서울大學校 體育硏究所論集 Vol.18 No.1
This study concerns the Japanese chivalry-Bushido, in Kamakura Age from 1192-1333, and the which process, background, factors. The fundamental composition of Bushido is that, the Shogun, sovereigns give the Gokenin, retainer, a faver and against that the retainer executed many kinds of duty in various way according to their master's favor. At that time the Gokenin received many influences of Yoritomo, who constructed Kamakura-Bakufu in 1192. Yoritomo always instructed to Gokenin to devote, being brave, to economize. Because of a lot of favor Gokenin was able to die for their master in the war. Especially they hoped so because they thought that to do so is the fundamental duty of Gokenin, samurai at that age. That caused the Japanese Bushido's mind which includes self sacrifice, braveness, and so on. Later such mind of Kamakura Age like Bushido represent Japanese samurai spirit. The significance of Bushido of Kamakura age exists in above spirits.
미쯔루, 니시와끼 師範大學 體育硏究所 1999 서울大學校 體育硏究所論集 Vol.20 No.1
In light of the rapid changes and increasing confusion in value systems and moral and ethical awareness worldwide, more emphasis is being placed on school education to play a role in ethical and moral education. In order to contribute to that end, the objective of this research is to examine the historical and conceptual background as well as the changes in such, of the traditional Japanese value system known as bushido. In order to achieve that objective, the main investigations can be summed up as follows : The cenral ethical concept of bushido was that ofloylty to one's lord or master. In this study, the bushido code which was based on the relationship between lord and vassal, where the lord provided for the vassal's needs and in return, the vassal gave undivided loyalty t the lord, has been designated as imperial bushdo. In examining the generational and ideological changes which took place in bushido from the turbulent Kamakura era, known as the golden age of bushido, to the Edo period, the influence bushido had on the confucian scholar Yi Toe-gye will be of special interest. Imperial bushido was the prime mover in the formation of the modern Japanese nation based on the central absolute control of the emperor as it was formed through the Meiji restoradon which signalled the close of the feudal Edo period. After the Meiji restoration, the samurai class disappeared, however, bushido remained as one important element of the general populace's spiritual foundation which played an important role in the rapid development of Japan.