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| 1 | Characteristics of authigenic pyrites in shallow core sediments in the Shenhu area of the northern South China Sea: Implications for a possible mud volcano environment显示文摘Distinct pyrites have been recovered from a shallow sediment core from Site 4B in the Shenhu area of the northern South China Sea. Based on the lithology, texture and structure of sediments, the stable sulfur isotope of pyrite and the total organic carbon (TOC) concentration of the sediments, a distinctive sediment interface is identified at a depth of about 1 m below the seafloor in the core sediments. The pyrites only accumulate in the lower part of the core as rods and foraminifera-infillings, and mainly within three intervals marked by high pyrite concentrations. The amount of pyrite in the sediments shows no remarkable correlation with TOC in the Site 4B core sediments. The stable sulfur isotopes of the pyrite have extremely negative values ranging from 41.69‰ to 49.16‰. They are considered to be the mutual product of sulfate bacterial reduction and sulfur bacterial disproportionation. Our research proposes that Site 4B might be located in or near a possible mud volcano sedimentary environment; a large amount of methane could migrate from deep to shallow sediments in an active mud volcano and thereby play a key role in the intensity of sulfate bacterial reduction and the amount of pyrite formed at Site 4B. Further, the variation in flux of deep methane fluid by intermittent mud volcanic eruptions might result in the deposition of authigenic pyrite intervals. | XIE Lei WANG JiaSheng WU NengYou WU DaiDai WANG Zhou ZHU XiaoWei HU Jun CHEN HongRen LIN Qi | 2013 | Science China Earth Sciences2013，56，4： | 14 |
| 2 | Adaptive impulse detection using center-weighted median filters 显示文摘 | CHEN Tao WU Hongren | 2001 | IEEE Signal Processing Letters2001，8，1： | 1 |
| 3 | A Generalized Block-edge Impairment Metric for Video Coding显示文摘 | WU Hongren Yuen Micheal | 1997 | IEEE Signal Processing Letters(S1070-9908)1997，4，11： | 1 |
| 4 | Adaptive impulse detection using center-weighted median filters显示文摘 | Chen Tao Wu Hongren | 2001 | IEEE Signal Processing Letters2001，8，1： | 1 |
| 5 | A robust structure-adaptive hybrid vector filter for color image restoration显示文摘 | Ma Zhonghua Wu Hongren Qiu Bin | 2005 | IEEE Transactions on Image Processing2005，14，12： | 1 |
| 6 | Adaptive impulse detection using center-weighted median filters显示文摘 | CHEN Tao WU Hongren | 2001 | IEEE Signal Processing Letters2001，8，1： | 1 |
| 7 | Adaptive postfiltering of transform coefficients for the reduction of blocking artifacts显示文摘 | Chen Tao Wu Hongren Qiu Bin | 2001 | IEEE Transactions on Circuits and Systems for Video Technology2001，11，5： | 1 |
| 8 | Robust shape feature-vector-based face recognition system 显示文摘 | Xu Zhengya Wu Hongren Yu Xinghuo | 2011 | Instrumenta- tion and Measurement IEEE Transactions on Biometrics Com pendium2011，60，12： | 1 |
| 9 | Perceptual Coding of Digital Monochrome Images 显示文摘 | Damian M T Wu Hongren Yu Zhenghua | 2004 | IEEE Signal Processing Letters2004，11，2： | 1 |
| 10 | Adaptive impulse detection using center - weighted median filters 显示文摘 | CHEN Tao WU Hongren | 2001 | IEEE Signal Process Letter2001，8，1： | 1 |
| 11 | Nu- merical modeling of hydraulic fractures interaction in complex naturally fractured formations显示文摘 | Kresse O Weng Xiaowei Gu Hongren Wu Ruiring | 2013 | Rock Mechan- ics and Rock Engineering2013，46，3： | 1 |
| 12 | A robust structure-adaptive hybrid vector filter for color image restoration显示文摘 | Ma Zhonghua Wu Hongren Qiu Bin | 2005 | Image Processing2005，14，12： | 1 |
| 13 | Adaptive impulse detection using center- weighted median filters 显示文摘 | Chen Tao Wu Hongren | 2001 | IEEE Signal Processing Letters2001，8，1： | 1 |
| 14 | The effect of extracellular polymeric substances (EPS) of iron-oxidizing bacteria (Ochrobactrum EEELCW01) on mineral transformation and arsenic (As) fate显示文摘Extracellular polymeric substances(EPS)are an importantmedium for communication and material exchange between iron-oxidizing bacteria and the external environment and could induce the iron(oxyhydr)oxides production which reduced arsenic(As)availability.The main component of EPS secreted by iron-oxidizing bacteria(Ochrobactrum EEELCW01)was composed of polysaccharides(150.76-165.33 mg/g DW)followed by considerably smaller amounts of proteins(12.98–16.12 mg/g DW).Low concentrations of As(100 or 500μmol/L)promoted the amount of EPS secretion.FTIR results showed that EPS was composed of polysaccharides,proteins,and a miniscule amount of nucleic acids.The functional groups including-COOH,-OH,-NH,-C=O,and-C-O played an important role in the adsorption of As.XPS results showed that As was bound to EPS in the form of As3+.With increasing As concentration,the proportion of As3+adsorbed on EPS increased.Ferrihydrite with a weak crystalline state was only produced in the system at 6 hr during the mineralization process of Ochrobactrum sp.At day 8,the minerals were composed of goethite,galena,and siderite.With the increasing mineralization time,the main mineral phases were transformed from weakly crystalline hydrous iron ore into higher crystallinity siderite(FeCO_(3))or goethite(α-FeOOH),and the specific surface area and active sites of minerals were reduced.It can be seen from the distribution of As elements that As is preferentially adsorbed on the edges of iron minerals.This study is potential to understand the biomineralizationmechanism of iron-oxidizing bacteria and As remediation in the environment. | Chuan Wu Yueru Chen Ziyan Qian Hongren Chen Waichin Li Qihou Li Shengguo Xue | 2023 | Journal of Environmental Sciences2023，，8： | 0 |
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