检索结果-南通市图书馆

Biosorption of mercury by Macrocystis pyrifera and Undaria pinnatifida:Influence of zinc,cadmium and nickel

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2011年第11期23卷 1778-1786页

作者： Josefina Plaza Marisa Viera Edgardo Donati eric Guibal Centro de Investigacióny Desarrollo en Fermentaciones Industriales CINDEFI (CCT La Plata-CONICET UNLP)Facultad de Ciencias Exactas50 y 115(1900) La PlataArgentina Ecole des Mines d'Ale`s Laboratoire Ge'nie de l'Environnement Industriel6avenue de Clavie`resF-30319 Ale`s cedexFrance Ecole des Mines d‘Ale`s Laboratoire Ge'nie de l‘Environnement Industriel6avenue de Clavie`resF-30319 Ale`s cedexFrance

This study investigated the adsorption of Hg（Ⅱ） on Macrocystis pyrifera and Undaria pinnatifida in monometallic system in the presence of Zn（II）,Cd（Ⅱ） and Ni（II）.The two biosorbents reached the same maximum sorption capacity （q m = 0.8 mmol/g） for *** showed a greater affinity （given by the coefficient b of the Langmuir equation） for mercury compared to *** （4.4 versus 2.7 L/mmol）.Mercury uptake was significantly reduced （by more than 50%） in the presence of competitor heavy metals such as Zn（II）,Cd（II） and Ni（Ⅱ）.Samples analysis using an environmental scanning electron microscopy equipped with an energy dispersive X-ray microanalysis showed that mercury was heterogeneously adsorbed on the surface of both biomaterials,while the other heavy metals were homogeneous *** analysis of biosorbents by Fourier transform infrared spectrometry indicated that Hg（Ⅱ） binding occurred on S=O （sulfonate） and N-H （amine） functional groups.

关键词： mercury isotherm sorption M.pyrifera U.pinnatifida ESEM-EDX FT-IR spectrometry

Capture efficiency of coal/biomass co-combustion ash in an electrostatic field

在线全文

学校读者我要写书评

暂无评论

Particuology 2018年第5期16卷 80-87页

作者： Jianyi Lu Lili Fu Ximei Li eric Eddings School of Environmental Science and Engineering North China Electric Power UniversityBaoding 071003China Department of Chemzcal Engineering and Institute for Secure and Clean Energy University of UtahSalt Lake City 84112USA

Ash samples from corn stalk and coal co-fired at 0%,5%,10%,15%,20%,and 100%biomass were collected by a 4-stage wire-pipe type electrostatic precipitator (ESP),and the ratio of 14C/12C in ash samples from the 0%,20%,and 100% co-firing scenarios were measured by an accelerator mass *** differential capture efficiency in electrostatic fields for coal ash,coal/biomass co-combustion ash (co- ash),and pure biomass ash was studied separately based on the ratio 14C/*** factors that may influence capture efficiency were analyzed,including microscopic morphology,resistivity,dust density, and particle size *** results indicate that co-ash may be efficiently captured by ESP,while pure biomass ash could ***-ash capture was mainly concentrated in the first two electrostatic fields in the lab-scale ESP,and the overall capture efficiency exceeded 90%.Biomass addition decreased the resistivity of co-ash,and enhanced its surface adsorption capacity to form agglomerates,facilitating the capture of *** capture efficiency of coal ash in co-ash was higher than that of pure coal ash in the first electrostatic field of the ***-firing biomass can aid the removal of both coal ash and biomass ash when using an ESP.

关键词： Biomass Co-combustion ash (co-ash) Capture efficiency Electrical field 14C/12C

Image matching algorithm based on SIFT using color and exposure information

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2016年第3期27卷 691-699页

作者： Yan Zhao Yuwei Zhai eric Dubois Shigang Wang School of Communication Engineering Jilin University School of Electrical Engineering and Computer Science University of Ottawa

Image matching based on scale invariant feature transform（SIFT） is one of the most popular image matching algorithms, which exhibits high robustness and accuracy. Grayscale images rather than color images are generally used to get SIFT descriptors in order to reduce the complexity. The regions which have a similar grayscale level but different hues tend to produce wrong matching results in this case. Therefore, the loss of color information may result in decreasing of matching ratio. An image matching algorithm based on SIFT is proposed, which adds a color offset and an exposure offset when converting color images to grayscale images in order to enhance the matching ratio. Experimental results show that the proposed algorithm can effectively differentiate the regions with different colors but the similar grayscale level, and increase the matching ratio of image matching based on SIFT. Furthermore, it does not introduce much complexity than the traditional SIFT.

关键词： scale invariant feature transform(SIFT) image matching color exposure

Preparation of Al-Cu-Fe-(Sn,Si) quasicrystalline bulks by laser multilayer cladding

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2012年第5期19卷 434-440页

作者： Li-ping Feng eric Fleury Guo-sheng Zhang Tianjin Research Institute of Construction Machinery Tianjin 300409 China State Key Laboratory of Tribology Tsinghua University Beijing 100084 China Center for High Temperature Energy Materials Korea Institute of Science ＆ Technology （K/ST） Seou1130 650 Korea

（A165Cu20Fe15）100-xSnx （x=0, 12, 20, 30） and A157SitoCulsFe15 powders were cladded on a medium carbon steel （45# steel） substrate by laser multilayer cladding, respectively. The phases and properties of the produced quasicrystalline bulks were investigated. It was found that the main phases in the A165Cu2oFe15 sample were crystalline L-Al13Fe4 and icosahedral quasicrystal together with a small volume fraction of 0-A12Cu phase. The volume fraction of icosahedral phase decreased as the Sn content in the （A165Cu20Fe18）100-xSnx samples increased owing to the formation of β-CuSn phase. The increase of Sn content improved the brittleness of the quasicrystal samples. The morphology of the solidification microstructure in the Al57Si10Cu18Fe15 sample changed from elongated shape to spherical shape due to the addition of Si. The nanohardness of the laser multilayer cladded quasicrystal samples was equal to that of the as-cast sample prepared by vacuum quenching. In terms of hardness, the laser cladded A157Si10Cu18Fe15 quasicrystalline alloy has the highest value among all the investigated samples.

关键词： quasicrystals laser cladding phase composition morphology mechanical properties nanohardness

Experimental investigations of internal energy dissipation during fracture of fiber-reinforced ultra-high-performance concrete

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2019年第1期13卷 190-200页

作者： eric N.LANDIS Roman KRAVCHUK Dmitry LOSHKOV Department of Civil &Environmental Engineering University of MaineOronoME 04469USA

Split-cylinder fracture of fiber-reinforced ultra-high-performance concrete (UHPC)was examined using two complementary techniques:X-ray computed tomography (CT)and acoustic emission (AE).Fifty-mm-diameter specimens of two different fiber types were scanned both before and after load *** the CT images,fiber orientation was evaluated to establish optimum and pessimum specimen orientations,at which fibers would have maximum and minimum effect,*** expected,fiber orientation affected both the peak load and the toughness of the specimen,with the optimum toughness being between 20% and 30%higher than the *** AE energy was also affected *** CT scans of the specimens were used to measure internal damage. Damage was quantified in terms of internal energy dissipation due to both matrix cracking and fiber pullout by using calibration measurements for *** results showed that fiber pullout was the dominant energy dissipation mechanism;however,the sum of the internal energy dissipation measured amounted to only 60% of the total energy dissipated by the specimens as measured by the net work of *** is postulated that localized compaction of the UHPC matrix as well as internal friction between fractured fragments makes up the balance of internal energy dissipation.

关键词： ultra-high-performance concrete concrete fracture X-ray computed tomography acoustic emission

Inhibitory effects of nisin-coated multi-walled carbon nanotube sheet on biofilm formation from Bacillus anthracis spores

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2014年第12期26卷 2526-2534页

作者： Xiuli Dong eric McCoy Mei Zhang Liju Yang Department of Pharmaceutical Sciences Biomanufacturing Research Institute and Technology Enterprise (BRITE) North Carolina Central UniversityDurham NC USA Department of Industrial & Manufacturing Engineering Florida State University Tallahassee FL USA

Multi-walled carbon nanotube（MWCNT） sheet was fabricated from a drawable MWCNT forest and then deposited on poly（methyl methacrylate） film. The film was further coated with a natural antimicrobial peptide nisin. We studied the effects of nisin coating on the attachment of Bacillus anthracis spores, the germination of attached spores, and the subsequent biofilm formation from attached spores. It was found that the strong adsorptivity and the super hydrophobicity of MWCNTs provided an ideal platform for nisin coating. Nisin coating on MWCNT sheets decreased surface hydrophobicity, reduced spore attachment, and reduced the germination of attached spores by 3.5 fold, and further inhibited the subsequent biofilm formation by 94.6% compared to that on uncoated MWCNT sheet. Nisin also changed the morphology of vegetative cells in the formed *** results of this study demonstrated that the anti-adhesion and antimicrobial effect of nisin in combination with the physical properties of carbon nanotubes had the potential in producing effective anti-biofilm formation surfaces.

关键词： Multi-walled carbon nanotubes (MWCNTs) Biofilm Bacillus anthracis Nisin

Optimization Potentials for the Waste Heat Recovery of a Gas-Steam Combined Cycle Power Plant Based on Absorption Heat Pump

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2019年第2期28卷 283-293页

作者： ZHANG Hongsheng ZHAO Hongbin LI Zhenlin HU eric College of Machinery and Transportation Engineering China University of Petroleum School of Mechanical Engineering the University of Adelaide Beijing Key Laboratory of Process Fluid Filtration and Separation

A new waste heat recovery system is presented to recover exhausted steam waste heat from the steam turbine by absorption heat pump(AHP) in a gas-steam combined cycle(GSCC) power plant. The system can decrease energy consumption and further improve the energy utilization. The performance evaluation criteria are calculated, and exergy analysis for key components are implemented in terms of the energy and exergy analysis theory. Besides, the change of these criteria is also revealed before and after modification. The net power output approximately increases by 21738 kW, and equivalent coal consumption decreases by 5.58 g/kWh. A 1.81% and 1.92% increase in the thermal and exergy efficiency is respectively obtained in the new integrated system as the heating load is 401095 kJ at 100% condition. Meanwhile, the appropriate extraction parameters for heating have been also analyzed in the two systems. The proposed scheme can not only save energy consumption but also reduce emission and gain great economic benefit, which is proven to be a huge potential for practical application.

关键词： combined cycle power plant absorption heat pump waste heat recovery evaluation criteria exergy analysis

Cross-regulation between CDK and MAPK control cellular fate

在线全文

学校读者我要写书评

暂无评论

Quantitative Biology 2021年第3期9卷 341-359页

作者： eric Durandau Serge Peiet Department of Fundamental Microbiology University of LausanneCH-1015 LausanneSwitzerland

Background:Commitment to a new cell cycle is controlled by a number of cellular ***-activated protein kinase(MAPK)pathways,which transduce multiple extracellular cues,have been shown to be interconnected with the cell cycle and can modulate its ***:In budding yeast,we have introduced fluorescent biosensors that monitor in real time the signaling activity of the MAPKs Fus3 and Kssl and the cyclin-dependent kinase(CDK)in individual *** have quantified in hundreds of live single cells the interplay between the MAPKs regulating the mating response and the CDK controlling cell cycle ***:Different patterns of MAPK activity dynamics could be identified by clustering cells based on their CDK activity,denoting the tight relationship between these two cellular *** data suggest that beyond the already well-established mechanisms of regulation between the MAPK and the CDK,additional mechanisms remain to be ***:A tight interplay between MAPK pathways and the cell cycle is essential to control cellular proliferation and cell fate decisions.

关键词： MAPK signaling cell cycle yeast mating single cell analysis fluorescent biosensors

Implication of Neuronal Versus Microglial P2X4 Receptors in Central Nervous System Disorders

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2020年第11期36卷 1327-1343页

作者： Alexia Duveau Eleonore Bertin eric Boue-Grabot Universite de Bordeaux Institut des Maladies NeurodegenerativesUMR 529333000 BordeauxFrance CNRS Institut des Maladies NeurodegenerativesUMR 529333000 BordeauxFrance

The P2X4 receptor(P2X4)is an ATP-gated cation channel that is highly permeable to Ca2+and widely expressed in neuronal and glial cell types throughout the central nervous system(CNS).A growing body of evidence indicates that P2X4 plays key roles in numerous central disorders.P2X4 trafficking is highly regulated and consequently in normal situations,P2X4 is present on the plasma membrane at low density and found mostly within intracellular endosomal/lysosomal *** increase in the de novo expression and/or surface density of P2X4 has been observed in microglia and/or neurons during pathological *** review aims to summarize knowledge on P2X4 functions in CNS disorders and provide some insights into the relative contributions of neuronal and glial P2X4 in pathological ***,determination of the cell-specific functions of P2X4 along with its intracellular and cell surface roles remain to be elucidated before its potential as a therapeutic target in multiple disorders can be defined.

关键词： Purinergic signaling P2X ATP Ligandgated ion channels Chronic pain Brain trauma Ischemia Neurodegenerative diseases Alcohol Neuropsychiatric disorders