http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
High-cycle fatigue characteristics of quasi-isotropic CFRP laminates
Hosoi, Atsushi,Arao, Yoshihiko,Karasawa, Hirokazu,Kawada, Hiroyuki The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.2
High-cycle fatigue characteristics of quasi-isotropic carbon fiber reinforced plastic (CFRP) laminates [-45/0/45/90]s up to $10^8$ cycles were investigated. To assess the fatigue behavior in the high-cycle region, fatigue tests were conducted at a frequency of 100 Hz, since it is difficult to investigate the fatigue characteristics in high-cycle at 5 Hz. Then, the damage behavior of the specimen was observed with a microscope, soft X-ray photography and a 3D ultrasonic inspection system. In this study, to evaluate quantitative characteristics of both transverse crack propagation and delamination growth in the high-cycle region, the energy release rate associated with damage growth in the width direction was calculated. Transverse crack propagation and delamination growth in the width direction were evaluated based on a modified Paris law approach. The results revealed that transverse crack propagation delayed under the test conditions of less than ${\sigma}_{max}/{\sigma}_b$ = 0.3 of the applied stress level.
포스터 발표 : 수질관리 ; 경작기간 동안 논으로부터 질소와 인의 유출특성
( Soo Yong Shim ),( Seung Hwan Sa ),( Takanori Masuda ),( Yoshihiko Hosoi ),( Bom Chul Kim ) 대한상하수도학회 2006 공동추계 학술발표회 논문집 Vol.2006 No.-
Our aim was to quantify and characterize total nitrogen (TN) and total phosphorus (TP) in runoff from paddy fields in agricultural areas of Tottori, Japan. Freshwater pollution and eutrophication usually involve excess input of nutrients such as N and P. Nonpoint source water pollution is more difficult to control than point source pollution, and the contribution from agricultural nonpoint sources has been increasing. We investigated the characteristics of pollutant runoff from four paddy fields of different sizes, in 2003 and 2004. The N and P export was investigated during rainfall events by examining the variation in TN and TP in runoff, the correlation between discharge and pollutant concentration and loading, and the event mean concentration (EMC). The average TN and TP concentrations in surface water in May and June were 7.3 and 2.2 ㎎ L(-1), respectively, in 2003, and 12.4 and 2.0 ㎎ L(-1), respectively, in 2004, and were higher than in other months [2003: 1.132 (TN) and 0.206 (TP) ㎎ L(-1); 2004: 1.243 (TN) and 0.284 (TP) ㎎ L(-1). TN and TP loadings tended to increase with increasing discharge in most paddy fields. The EMCs were similar among the four paddy fields, but rainfall events differed. The calculated annual pollutant loadings (TN and TP) per unit area were 0.084 (2003) and 0.010 (2004) ton N y(-1) ha(-1), and 0.029 (2003) and 0.004 (2004) ton P y(-1) ha(-1) in one field; those of the other fields were similar. Thus, pollutant contributions from paddy fields as nonpoint agricultural sources are substantial, and continuous examination of discharge water is important for the control and management of agricultural nonpoint source pollution.
( Soo Yong Shim ),( Seung Hwan Sa ),( Takanori Masuda ),( Yoshihiko Hosoi ),( Bom Chul Kim ) 한국물환경학회 2006 공동 추계학술발표회 Vol.2006 No.-
Our aim was to quantify and characterize total nitrogen (TN) and total phosphorus (TP) in runoff from paddy fields in agricultural areas of Tottori, Japan. Freshwater pollution and eutrophication usually involve excess input of nutrients such as N and P. Nonpoint source water pollution is more difficult to control than point source pollution, and the contribution from agricultural nonpoint sources has been increasing. We investigated the characteristics of pollutant runoff from four paddy fields of different sizes, in 2003 and 2004. The N and P export was investigated during rainfall events by examining the variation in TN and TP in runoff, the correlation between discharge and pollutant concentration and loading, and the event mean concentration (EMC). The average TN and TP concentrations in surface water in May and June were 7.3 and 2.2 ㎎ L(-1), respectively, in 2003, and 12.4 and 2.0 ㎎ L(-1), respectively, in 2004, and were higher than in other months [2003: 1.132 (TN) and 0.206 (TP) ㎎ L(-1); 2004: 1.243 (TN) and 0.284 (TP) ㎎ L(-1). TN and TP loadings tended to increase with increasing discharge in most paddy fields. The EMCs were similar among the four paddy fields, but rainfall events differed. The calculated annual pollutant loadings (TN and TP) per unit area were 0.084 (2003) and 0.010 (2004) ton N y(-1) ha(-1), and 0.029 (2003) and 0.004 (2004) ton P y(-1) ha(-1) in one field; those of the other fields were similar. Thus, pollutant contributions from paddy fields as nonpoint agricultural sources are substantial, and continuous examination of discharge water is important for the control and management of agricultural nonpoint source pollution.
심수용 ( Soo Young Shim ),김범철 ( Bum Chul Kim ),호소이요시히코 ( Yoshihiko Hosoi ),마스다다카노리 ( Takanori Masuda ) 한국물환경학회 2005 한국물환경학회지 Vol.21 No.2
The aim of this study is to quantify and characterize the dissolved organic carbon (DOC) from paddy fields and crop fields in Tottori, Japan. DOC and ultraviolet (UV) absorption were measured in the filtrated water of each sample. The DOC concentration and the SUVA (specific UV absorption) of biodegradation analysis samples were determined around 50 days after their incubation. In the Fukui paddy fields, DOC concentration varied seasonally from 1.1 to 10.1 ㎎ Cl^(-1), becoming higher during heavy runoffs in April, a non-agriculture period. Variations in DOC concentration did not always correspond to rainfall, though. The Obadake paddy fields showed a DOC concentration pattern similar to that of the Fukui paddy fields. The daily DOC discharge per area in the Fukui (up), Fukui (down), Obadake (south) and Obadake (north) paddy fields influent from paddy fields were 0.02, 0.0161, 0.0135 and 0.0027 ㎏ a^(-1) day^(-1), respectively. These differences resulted from differences in agricultural types and customs of farmers according to paddy fields and other kinds of fields. Also, the SUVAs [which are indirect means to evaluate humic substances (hydrophobic fractions)] of the studied influent waters from paddy fields were generally lower than those of the influent waters from crop fields. Nonbiodegradable DOC accounted for 50.2-98% and 46.8-85.5% of the total DOC in the paddy fields and in the crop fields, respectively.