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RISS 인기검색어
- 검색키워드
- 저자 : Jianjun Lian (검색결과 4 건)
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Vertical Migration of Sound Scatterers in the Southern Yellow Sea in Summer
Lian-Gang Lü,Jianjun Liu,Fei Yu,Wei Wu,Xiaodong 한국해양과학기술원 2007 Ocean science journal Vol.42 No.1
Acoustic volume backscattering strength data were collected and Conductivity Temperature Depth (CTD) measurements were conducted in the southern Yellow Sea in summer 2005 and 2006. The high temporal and vertical resolution acoustic data measured with a 307 kHz Acoustic Doppler Current Profiler (ADCP) and a 250 kHz acoustic Doppler profile (ADP) had dominant diel variation, which resulted from vertical migration of sound scatterers. Some scatterers congregating in the bottom layer in the daytime migrated upward at dusk, and migrated downward into the bottom layer at dawn. The migration speeds were estimated. More than 33 days data show that the diel migration varies with time. The feature of migration measured with ADCP and ADP is consistent to some extent with what is described in the study on vertical migration of zooplankton in the southern Yellow Sea with conventional net samples.
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Vertical Migration of Sound Scatterers in the Southern Yellow Sea in Summer
Lu, Lian-Gang,Liu, Jianjun,Yu, Fei,Wu, Wei,Yang, Xiaodong The Korean Society of Oceanography 2007 Ocean science journal Vol.42 No.1
Acoustic volume backscattering strength data were collected and Conductivity Temperature Depth (CTD) measurements were conducted in the southern Yellow Sea in summer 2005 and 2006. The high temporal and vertical resolution acoustic data measured with a 307 kHz Acoustic Doppler Current Profiler (ADCP) and a 250 kHz acoustic Doppler profile (ADP) had dominant diel variation, which resulted from vertical migration of sound scatterers. Some scatterers congregating in the bottom layer in the daytime migrated upward at dusk, and migrated downward into the bottom layer at dawn. The migration speeds were estimated. More than 33 days data show that the diel migration varies with time. The feature of migration measured with ADCP and ADP is consistent to some extent with what is described in the study on vertical migration of zooplankton in the southern Yellow Sea with conventional net samples.
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Jingyi Ren,Dandan Lian,Jianjun Lu 한국섬유공학회 2021 Fibers and polymers Vol.22 No.5
The hygroscopic and dyeable polyphenylene sulfide (PPS) composite fiber was prepared using a twin-screwextruder and a melt spinning machine. A new dyeing process was proposed and the moisture absorption and dyeingmechanism of the composite fiber was analyzed. The results show that sodium polyacrylate (PAAS) is uniformly dispersed inthe PPS matrix and is compatible with PPS at the macromolecular level. The thermal properties of the composite fibers arebasically unchanged, and the crystallinity is slightly reduced. With the increase of PAAS content, the normal moisture regainof the composite fiber reached 2.11 % from 0.21 %, and the contact angle decreased from 73.8 ° to 52.3 °. Under the newdyeing technology, the dyeing rate of the composite fiber reached 93 %, and the washing fastness was grade 5. Themechanism of hygroscopicity and dyeing of macromolecular space networks and polyelectrolyte was proposed.
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Particle Size Dependent Heavy Metals in Road Dusts from Maanshan City, China
Siping Niu,Xiaolong Song,Jianghua Yu,Xuan Wang,Jianjun Lian 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.5
In this study the road dusts (RDs) <1,000 μm from Maanshan City, China were characterized from the prospects of size fractionated pollution by heavy metals (HMs). Particulates with size <75 μm, 75 − 125 μm, 125 − 250 μm, 250 − 500 μm and 500 − 1,000 μm averagely accountedfor 35.7±11.7%, 14.6±11.0%, 25.3±12.5%, 11.6±8.8% and 12.8±12.9% of the total weight, respectively. This result implies the gravimetric percentage was overall declined with increasing granular size, following gamma distribution function (p < 0.001). It was observed that the highest contents of Zn, Ni, Pb and Cd occurred with the fine RDs <75 μm while Cu with these <125 μm, suggesting HMs preferred to be associated with the fine particulates. Cu, Zn, Ni, Pb, Cr and Cd were present in RDs with bulk contents of 68±30 mg/kg, 285±122 mg/kg, 23±16 mg/kg, 53±21 mg/kg, 432+297 mg/kg and 0.56±0.39 mg/kg, which resulted in geo-accumulation index (Igeo) values as -1.04, 2.35, -2.38, 0.38, 1.54 and 0.18, respectively. Hence, it can be concluded that the RDs had only been significantly polluted by Zn. Person correlation analysis suggests those HMs ubiquitously present in RDs had size-dependent sources.
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