检索结果-南通市图书馆

A Closed Form Solution to One Dimensional Robin Boundary Problems

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2012年第3期28卷 549-556页

作者： Chang-li YANG Ai-lin zhu Physics Department East China Normal University200062ShanghaiChina School of Finance and Statistics East China Normal University200062ShanghaiChina

Many cellular and subcellular biological processes can be described in terms of diffusing and chemically reacting species （e.g. enzymes）. In this paper, we will use reflected and absorbed Brownian motion and stochastic differential equations to construct a closed form solution to one dimensional Robin boundary problems. Meanwhile, we will give a reasonable explanation to the closed form solution from a stochastic point of view. Finally, we will extend the problem to Robin boundary problem with two boundary conditions and give a specific solution by resorting to a stopping time.

关键词： partial differential equations Robin boundary problem diffusion processes Girsanov's formula

Augmented Spinor Space

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2007年第2期28卷 225-234页

作者： Xiuhong FENG lin zhu Yanlin YU Department of Mathematics School of Sciences Suzhou University Suzhou 215006 Jiangsu China

In this paper, based on the Pauli matrices, a notion of augmented spinor space is introduced, and a uniqueness of such augmented spinor space of rank n is proved. It may be expected that this new notion of spaces can ... 详细信息

关键词： Augmented spinor space Pauli matrices Jack-orientation Superalgebra Jack map

Trifluoromethylation of Alkyl Radicals: Breakthrough and Challenges

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2020年第7期38卷 787-789页

作者： lin zhu Yewen Fang Chaozhong Li School of Materials and Chemical Engineering Ningbo University of TechnologyNo.201 Fenghua RoadNingboZhejiang 315211China Key Laboratory of Organofiuorine Chemistry Center for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryChinese Academy of Sciences345 Lingling RoodShanghai 200032China

Trifuoromethylation of alkyl radicals is emerging as a powerful tool for C(sp3)-CFs bond *** on the hypothesis of CF3 group transfer from Cu(Ⅱ)-CFs3 to alkyl radicals,a number of tifuoromethylation reactions have been developed,including tifloromethylation of alkyl halides,decarboxyla-tive trifluoromethylation of aliphatic carboxylic acids,C(sp'H-H tifluoromethylation,amino-and carbo-tifluoromethylation of alkenes,*** in this intriguing field are also discussed.

关键词： Cu(Ⅱ) alkyl hypothesis

Facile room-temperature coprecipitation of uniform barium chlorapatite nanoassemblies as a host photoluminescent material

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

Particuology 2018年第2期16卷 37-42页

作者： Peiyan Zhai Xiuping Chen Zhaoqiang Zhang lin zhu Heng Zhang Wancheng zhu Department of Chemical Engineering Qufu Normal University Shandong 273165 China

As an emerging host phosphor material, barium chlorapatite （Bas（PO4）3CI）, is attracting growing attention. However, rare earth-doped Bas（PO4）3CI phosphors have mainly been obtained via high temperature-based, energy-consuming techniques. In this contribution, we developed a straight- forward, facile room-temperature coprecipitation method in the presence of a specific amount of ethylenediaminetetraacetic acid disodium salt that provided Bas（PO4）3CI nanoparticles self-assembled to construct uniform Bas（PO4）3CI nanoassemblies （diameter： 80-120 nm） as well as rare earth Tb3＋- doped Bas（PO4）3CI：xTb3＋ nanophosphors. The nanoassemblies were transparent within the ultraviolet and visible spectral range. The Bas（PO4）3CI：xTb3＋ nanophosphors exhibited four emission peaks under 228-nm excitation, and the optimal doping amount of Tb3＋ was 4.0%. In contrast to traditional energy-consuming, high-temperature techniques, the facile room-temperature coprecipitation method developed here represents an attractive alternative route to obtain uniform Ba5（PO4）3CI nanoassemblies and Bas（PO4）3CI：xTb3＋ nanopbosphors that are candidate luminescent hosts.

关键词： Barium chlorapatite Nanoassemblies Phosphors Luminescence Room-temperature coprecipitation

Microcystin-degrading bacteria affect mcy D expression and microcystin synthesis in Microcystis spp

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 2016年第3期28卷 195-201页

作者： lin zhu Jun Zuo Lirong Song Nanqin Gan State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China University of Chinese Academy of Sciences Beijing 100049China

Cyanobacterial blooms occur increasingly often and cause ecological,economic and human health problems ***（MCs）are the dominant toxins produced by cyanobacteria and are implicated in epidemic disease and environmental *** research has been reported on the various regulating factors,e.g.,light,temperature,nutrients such as nitrogen and phosphorus,p H,iron,xenobiotics,and predators,that influence microcystin（MC）synthesis,but little is known about the effects of cyanobacteria-associated bacteria on MC synthesis.A considerable number of studies have focused on interactions between Microcystis species and their associated *** this study,we evaluated the effects of MC-degrading bacteria（MCDB）on MC synthesis gene mcy D expression and MC synthesis in axenic strain PCC7806,non-axenic strain FACHB905,and colony strain FACHB1325 of Microcystis by quantitative real-time polymerase chain reaction（RT-PCR）assay and enzyme-linked immunosorbent assay（ELISA）.We demonstrate for the first time that MCDB can induce and up-regulate the MC production and transcriptional response of the mcy D gene of toxic *** day 4 of the culturing experiment,the intracellular MC concentration and transcriptional response of mcy D of FACHB1325 were up-regulated 1.9 and 5.3-fold over that of the control,and for FACHB905 were up-regulated 1.8 and 4.2-fold over that of the control,*** day 10,the transcriptional response of mcy D was up-regulated 21.3-fold in *** results indicate that there are interactions between toxic Microcystis and MCDB,and MCDB may play a role in regulating mcy D expression in toxic Microcystis.

关键词： Microcystis Microcystins MC-degrading bacteria mcyD gene

Accumulation and elimination of iron oxide nanomaterials in zebrafish(Danio rerio) upon chronic aqueous exposure

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2015年第4期27卷 223-230页

作者： Yang Zhang lin zhu Ya Zhou Jimiao Chen Key Laboratory of Pollution Processes and Environmental Criteria Ministry of Education Tianjin Key Laboratory of Environmental Remediation and Pollution Control College of Environmental Science and Engineering Nankai University

A 52-day continuous semi-static waterborne exposure（test media renewed daily） regimen was employed to investigate the accumulation and elimination profiles of two iron oxide nanomaterials（nano-Fe2O3 and nano-Fe3O4） in zebrafish（Danio rerio）. Adult zebrafish were exposed to nanomaterial suspensions with initial concentrations of 4.0 and 10.0 mg/L for28 days and then were moved to clean water for 24 days to perform the elimination experiment. Fe content was measured in fish body and feces to provide data on accumulation and elimination of the two iron oxide nanomaterials in zebrafish. The experiment revealed that：（1） high accumulation of nano-Fe2O3 and nano-Fe3O4 were found in zebrafish, with maximum Fe contents, respectively, of 1.32 and 1.25 mg/g for 4.0 mg/L treatment groups and 1.15 and 0.90 mg/g for 10.0 mg/L treatment groups;（2） accumulated nanoparticles in zebrafish can be eliminated efficiently（the decrease of body burden of Fe conforms to a first-order decay equation） when fish were moved to nanoparticle-free water,and the elimination rates ranged from 86% to 100% by 24 days post-exposure; and（3）according to analysis of Fe content in fish excrement in the elimination phase, iron oxide nanomaterials may be adsorbed via the gastrointestinal tract, and stored for more than12 days.

关键词： Iron oxide nanomaterials Zebrafish Chronic exposure Accumulation Elimination

Effect of MoO_3 on vanadium based catalysts for the selective catalytic reduction of NO_x with NH_3 at low temperature

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第6期29卷 169-179页

作者： lin zhu Zhaoping Zhong Han Yang Chunhua Wang Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast University College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics

The selective catalytic reduction （SCR） activities of the MoO3 doped V/WTi catalysts prepared by the incipient wetness impregnation method at low temperature were investigated. The results showed that the addition of MoO3 could enhance the NOx conversion at low temperature and the best SCR activity was obtained when the dosage of MoO3 reached 5 wt.%. The NH3-TPD and DRIFTS experiments indicated that the addition of MoO3 changed the type and number of acid sites on the surface of catalysts and reaction activities of acid sites were altered at the same time. The redox capacity and amount of active oxygen species got improved for V3Mo5/WTi catalyst, which could be confirmed by the H2-TPR and transient response experiments. Water vapor inhibited the NOx conversion at low temperature. Deposition of ammonium sulfate or bisulfate might be main reason for the loss of catalytic activity in the presence of SO2 at low temperature. Choosing the suitable NH3/NO ratio and elevation of reaction temperature both could weaken the influence of SO2 on the SCR activity of the V3MoSAFTi catalyst. Thermal treatment of the deactivated catalyst at 350℃ could get the low temperature activity recovered. The decrease of GHSV improved the deNOx efficiency at low temperature and we speculated that the rational technological process and operation parameters could contribute to the application of this kind of catalysts in real industrial environment.

关键词： Vanadium MoO3 SCR Low temperature H20SO2

Canonical Transformations and Poisson Theory for Dynamics with Non-Standard Lagrangians

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2024年第2期29卷 106-116页

作者： zhu lin ZHANG Yi School of Mathematical Sciences Suzhou University of Science and TechnologySuzhou 215009JiangsuChina School of Civil Engineering Suzhou University of Science and TechnologySuzhou 215011JiangsuChina

The canonical transformation and Poisson theory of dynamical systems with exponential,power-law,and logarithmic non-standard Lagrangians are studied,*** criterion equations of canonical transformation are established,and four basic forms of canonical transformations are *** dynamic equations with non-standard Lagrangians admit Lie algebraic *** this,we es-tablish the Poisson theory,which makes it possible to find new conservation laws through known conserved *** examples are put forward to demonstrate the use of the theory and verify its effectiveness.

关键词： non-standard Lagrangians dynamical equations canonical transformation Poisson theory

Possible connection between anomalous activity of Scandinavian Atmospheric Teleconnection Pattern and winter snowfall in the Yangtze-Huaihe River Basin of China

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2019年第3期12卷 218-225页

作者： zhu lin CHEN Haishan Key Laboratory of Meteorological Disaster Ministry of Education/International Joint Research Laboratory on Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science& Technology

The temporal and spatial characteristics of winter snowfall in the Yangtze–Huaihe River Basin (YHRB) of China and its possible connection with Scandinavian Atmospheric Teleconnection Pattern (SCAND) anomalies are explored based on daily meteorological data contained in the Daily Surface Climate Dataset for China (V3.0) during the period 1960–2012. Results show that winter snowfall in the YHRB exhibits consistent anomalies over the whole region for the interannual variation during 1960–2012. Further analysis suggests that winter snowfall anomalies in the YHRB are closely linked to the anomalous wintertime SCAND activity. When there is more winter snowfall in the YHRB, SCAND is usually in a positive phase, accompanied by a strengthened Urals blocking high and East Asian trough, which is conducive to strengthened cold-air activity, intensified vertical motions, and more water vapor transport in the YHRB. In contrast, less winter snowfall in the YHRB usually happens in the negative phase of SCAND. Our results provide useful information to better understand the relevant mechanism responsible for anomalous winter snowfall in this area.

关键词： Winter snowfall Yangtze– Huaihe River Basin atmospheric general circulation Scandinavian Atmospheric Teleconnection Pattern