检索结果-南通市图书馆

Waste Activated Sludge Alkaline Fermentation Liquid as Carbon Source for Biological Nutrients Removal in Anaerobic Followed by Alternating Aerobic-Anoxic Sequencing Batch Reactors

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2010年第3期18卷 478-485页

作者：郑雄陈银广刘晨晨 State Key Laboratory of Pollution Control and Resources Reuse School of Environmental Science and Engineering Tongji University Shanghai 200092 China kuang yarning honors school Nanjing University Nanjing 210093 China

Activated sludge process has been widely used to remove phosphorus and nitrogen from wastewater. However,the nitrogen and phosphorus removal is sometimes unsatisfactory due to the low influent *** problem with the activated sludge process is that large amount of waste activated sludge is produced,which needs further *** this study,the waste activated sludge alkaline fermentation liquid was used as the main carbon source for phosphorus and nitrogen removal under anaerobic followed by alternating aerobic-anoxic conditions,and the results were compared with those using acetic acid as the carbon *** use of alkaline fermentation liquid not only affected the transformations of phosphorus,nitrogen,intracellular polyhydroxyalkanoates and glycogen, but also led to higher removal efficiencies for phosphorus and nitrogen compared with acetic *** was observed that ammonium was completely removed with either alkaline fermentation liquid or acetic acid as the carbon source. However,the former resulted in higher removal efficiencies for phosphorus(95%)and nitrogen(82%),while the latter showed lower ones(87%and 74%,respectively).The presence of a large amount of propionic acid in the alkaline fermentation liquid was one possible reason for its higher phosphorus removal *** instead of endogenous denitrification was the main pathway for nitrogen removal with the alkaline fermentation liquid as the carbon source,which was responsible for its higher nitrogen removal *** seems that the alkaline fermentation liquid can replace acetic acid as the carbon source for phosphorus and nitrogen removal in anaerobic fol- lowed by alternating aerobic-anoxic sequencing batch reactor.

关键词： nutrients removal alkaline fermentation liquid waste activated sludge endogenous denitrification carbon source

Surface photometry and radial color gradients of nearby luminous early-type galaxies in SDSS Stripe 82

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2011年第3期11卷 309-326页

作者： Fang-Zhou Jiang Song Huang Qiu-Sheng Gu Department for Intensive Instruction Kuang Yaming Honors School Nanjing University Nanjing 210093 China Department of Astronomy Nanjing University Nanjing 210093 China

We make use of the images from the Sloan Digital Sky Survey Stripe 82（Stripe 82） to present an analysis of r band surface brightness profiles and radial color gradients（g-r,u-r） in our sample of 111 nearby early-type galaxies（ETGs） .Thanks to the Stripe 82 images,each of which is co-added from about 50 single frames,we are able to pay special attention to the low-surface-brightness areas（LSB areas） of the *** LSB areas affect the Sérsic fittings and concentration indices by making both of the indices less than the typical values for *** the Sérsic fits to all the surface brightness profiles,we found some Sérsic indices that range from 1.5 to 2.5,much smaller than those of typical de Vaucouleur profiles and relatively close to those of exponential disks,and some others much larger than four but still with accurate *** galaxies cannot be fitted with a single Sérsic profile,but once we try double Sérsic profiles,the fittings are improved：one with a profile relatively close to the de Vaucouleur law in the inner area and a profile relatively close to an exponential law in the LSB area,the other with a nice fitting in the inner area but still having a failed fitting in the outer *** 60%of the sample has negative color gradients（red-core） within 1.5Re,much more than the approximately 10%positive ones（blue-core） within the same ***,taking into account the LSB areas,we find that the color gradients are not necessarily monotonic：about one third of the red-core（or blue-core） galaxies have positive（or negative） color gradients in the outer areas. So LSB areas not only make ETGs’Sérsic profiles deviate from de Vaucouleur ones and shift to the disk end,but also reveal that quite a number of ETGs have opposite color gradients in inner and outer *** outcomes remind us of the necessity of double-Sérsic *** LSB phenomena may be interpreted by mergers and thus have different metallicity in the outer *** parameters ar

关键词： galaxies:early-type galaxies—galaxies:surface brightness profiles and color gradients—techniques:photometric

Computational prediction of RNA tertiary structures using machine learning methods

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第10期29卷 17-23页

作者： Bin Huang Yuanyang Du Shuai Zhang Wenfei Li Jun Wang Jian Zhang National Laboratory of Solid State Microstructures School of PhysicsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Institute for Brain Sciences Kuang Yaming Honors SchoolNanjing UniversityNanjing 210093China

RNAs play crucial and versatile roles in biological processes. Computational prediction approaches can help to understand RNA structures and their stabilizing factors, thus providing information on their functions, and facilitating the design of new RNAs. Machine learning (ML) techniques have made tremendous progress in many fields in the past few years. Although their usage in protein-related fields has a long history, the use of ML methods in predicting RNA tertiary structures is new and rare. Here, we review the recent advances of using ML methods on RNA structure predictions and discuss the advantages and limitation, the difficulties and potentials of these approaches when applied in the field.

关键词： RNA structure prediction RNA scoring function knowledge-based potentials machine learning convolutional neural networks

Second to tenth order susceptibilities of conserved charges within a modified Nambu-Jona-Lasinio model

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2019年第5期43卷 99-106页

作者： Wenkai Fan Xiaofeng Luo Hongshi Zong kuang Yaming honors school Nanjing University Key Laboratory of Quark &Lepton Physics (MOE) and Institute of Particle Physics Central China Normal University Department of Physics Nanjing University

We discuss the sign and energy dependence of second to tenth order susceptibilities of the baryon number,charge number, and strangeness for the analysis of critical conditions in heavy ion collisions in the LHC and RHIC by applying a modified Nambu-Jona-Lasinio model. This model is fitted to the quark condensate of the lattice QCD result at finite temperature and zero baryon chemical potential. The presence of a critical point made these susceptibilities deviate considerably from a Hadron-Resonance-Gas model that shows no criticality. The sign, magnitude, and energy dependence of these higher order fluctuations hint towards the existence and location of a critical point that could be discovered in future heavy ion collision experiments.

关键词： QCD critical point NJL model heavy-ion collisions QCD phase diagram

The birhythmicity increases the diversity of p53 oscillation induced by DNA damage

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第12期26卷 68-75页

作者：王道光周春红张小鹏 National Laboratory of Solid State Microstructure and Department of Physics Nanjing University Nanjing 210093 China school of Physics and Electronic Engineering Jiangsu Normal University Xuzhou 221116 China kuang Yaming honors school Nanjing University Nanjing 210023 China

The tumor suppressor p53 mediates the cellular response to various stresses. It was experimentally shown that the concentration of p53 can show oscillations with short or long periods upon DNA damage. The underlying mechanism for this phenomenon is still not fully understood. Here, we construct a network model comprising the ATM-p53-Wip1 and p53-Mdm2 negative feedback loops and ATM autoactivation. We recapitulate the typical features of p53 oscillations including p53 birhythmicity. We show the dependence of p53 birhythmicity on various factors such as the phosphorylation status of ATM. We also perform stochastic simulation and find the noise-induced transitions between two modes of p53 oscillation, which increases the p53 variability in both the amplitude and period. These results suggest that p53 birhythmicity enhances the responsiveness of p53 network, which may facilitate its tumor suppressive function.

关键词： p53 birhythmicity oscillation

Cis-interaction of ligands on a supported lipid bilayer afects their binding to cell adhesion receptors

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2021年第10期64卷 113-122页

作者： Long Li Jinglei Hu Huaping Wu Fan Song State Key Laboratory of Nonlinear Mechanics(LNM)and Beijing Key Laboratory of Engineered Construction and Mechanobiology Institute of MechanicsChinese Academy of SciencesBeijing 100190China kuang yarning honors school&Institute for Brain Sciences Nanjing UniversityNanjing 210023China Shenzhen Research Institute Nanjing UniversityShenzhen 518057China College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310023China school of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

Cell adhesion on a supported lipid bilayer(SLB) functionalized with ligand proteins is a widely-used cell-mimetic model for the study of the trans receptor-ligand interaction that mediates the adhesion, and has been shown to play an important role in unravelling the molecular players in cell adhesion. Experimental studies of such cell-SLB adhesion systems often assume that there is no cis interactions between the ligands. An important question remains whether the cis-interaction afects the trans receptor-ligand interaction. Using a statistical-mechanical model and Monte Carlo simulations with biologically relevant parameters, we find that the attractive cis-interaction of strength 1 kBT between adjacent ligands on the SLB can lead to an amplification of both the affinity and cooperativity of the receptor-ligand binding, thereby facilitating the phase separation within the adhering cell membrane. In contrast, the adhesion system is less sensitive to the repulsive cis-interaction between adjacent ligands on the *** results suggest that the ligand-ligand cis-interaction should be carefully considered in the cell-SLB adhesion experiments.

关键词： cell adhesion ligand-ligand cis-interaction receptor-ligand interaction phase behavior

Carbon-halogen bond activation by a structurally constrained phosphorus(Ⅲ)platform

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第4期32卷 1432-1436页

作者： Penglong Wang Qin Zhu Yi Wang Guixiang Zeng Jun Zhu Congqing Zhu State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093China kuang yarning honors school Institute for Brain SciencesNanjing UniversityNanjing 210093China State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials(iChEM) and Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Theσ-bond activation by main group element has received enormous attention from theoretical and experimental ***,the reaction of C-X(X=Cl,Br,I)bonds in benzyl and allyl halides with a pincer-type phosphorus(Ⅲ)species was reported.A series of structurally robust phosphorus(Ⅴ)compounds were formed via the formal oxidative addition reactions of C-X bonds to the phosphorus(Ⅲ)*** functional theory calculations show that the nucleophilic addition process is more favorable than the direct oxidative addition *** of bent structures of phosphorus(Ⅲ)compound to poorly nucleophilic compounds to undergo further C-X bond activation can be rationalized by frontier molecule orbital *** study not only provides a deep understanding of the reactivity of phosphorus(Ⅲ)species but also demonstrates a potential of main group elements for the small-molecule activation.

关键词： Pincer ligand Phosphorus C-X bond activation Main group element

Full-Dimensional Potential Energy Surfaces of Ground(X^(2)A′)and Excited(A^(2)A″)Electronic States of HCO and Absorption Spectrum

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2022年第2期35卷 303-310,I0002页

作者： Qixin Chen Shanyu Han Xixi Hu Daiqian Xie Institute of Theoretical and Computational Chemistry Key Laboratory of Mesoscopic ChemistrySchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Department of Chemistry and Chemical Biology University of New MexicoNew Mexico 87131USA kuang Yaming honors school Institute for Brain SciencesNanjing UniversityNanjing 210023China

In this work,high-fidelity full-dimensional potential energy surfaces(PESs)of the ground(X^(2)A′)and first doublet excited(A^(2)A″)electronic states of HCO were constructed using neural network *** total,4624 high-level ab initio points have been used which were calculated at Davidson corrected internally contracted MRCI-F12 level of theory with a quite large basis set(ACV5Z)without any scaling *** with the results obtained from the scaled PESs of Ndenguéet al.,the absorption spectrum based on our PESs has slightly larger intensity,and the peak positions are shifted to smaller energy for dozens of *** is indicated that the scaling of potential energy may make some unpredictable difference on the dynamical ***,the resonance energies based on those scaled PESs are slightly closer to the current available experimental values than ***,the unscaled high-level PESs developed in this work might provide a platform for further experimental and theoretical photodissociation and collisional dynamic studies for HCO system.

关键词： Potential energy surface Photodissociation process Absorption spectrum Neural network Excited state

Ab Initio Study of Interaction Between Transition Metal and Graphene for Graphene Growth, Formation of Fe Nanostructures, and C-C Dissociation of Graphene Edge

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

Ab Initio Study of Interaction Between Transition Metal and ...