检索结果-南通市图书馆

Distribution of polybrominated diphenyl ethers in the surface sediment of the East China Sea

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2014年第4期59卷 379-387页

作者： huijuan li Jing lan Guoliang li Zongshan Zhao Guibin Jiang Key laboratory of Marine Chemistry Theory and Technology Ministry of Education Ocean University of China College of Chemistry and Pharmaceutical Sciences Qingdao Agricultural University State Key laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences

The concentrations of polybrominated diphenyl ethers(PBDEs)were determined in the surface sediments of 20 locations in the East China Sea(ECS).The P PBDEs(sum of 13 PBDE congeners,without brominated diphenyl ether 209(BDE209)ranged from 2.6 to 49 pg g-1(dry weight)with an average of 21 pg g-1,which fell at the low end of the global *** spatial distribution presented an offshore decreasing trend towards the outer shelf and along the coastline,suggesting a direct influence of the inputs by the Yangtze *** P PBDE concentrations were influenced by the total organic carbon of the sediment,as demonstrated by their similar spatial *** P C27?C29?C31n-alkanes concentrations and sand%reported in the literature for sediments in the ECS presented similar spatial distributions as P PBDEs,which suggests that a considerable part of P PBDEs may come from the Yangtze River and that grain size plays an important role in PBDE *** three dominant congeners were BDE28(19.8%),BDE47(26.4%),and BDE99(16.8%).The present study compared the congener patterns of the sedimentary PBDEs with those of commercial *** results indicated the possible use of penta-BDE in the Yangtze River Basin in a wide range or the fractionation and transformation of PBDE congeners during their long-range transport.

关键词：多溴联苯醚沉积物分布表层沉积物东中国海多溴二苯醚空间分布长江流域 PBDEs

Null Controllability for Some Systems of Two Backward Stochastic Heat Equations with One Control Force

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2012年第6期33卷 909-918页

作者： Hongheng lI Qi lÜ College of Mathematics and Information Science Leshan Normal University School of Mathematical Sciences University of Electronic Science and Technology of China Basque Center for Applied Mathematics Mazarredo 14 48009BilbaoBasque CountrySpain.

Abstract The authors establish the null controllability for some systems coupled by two backward stochastic heat equations. The desired controllability result is obtained by means of proving a suitable observability e... 详细信息

关键词： Backward stochastic heat equation, Null controllability Observabilityestimate

Effects of fluoride on the removal of cadmium and phosphate by aluminum coagulation

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2015年第6期27卷 118-125页

作者： Ruiping l.u Bao l.u lijun Zhu Zan He Jiawei Ju Huachun lan huijuan l.u Key laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences university of Chinese Academy of Sciences

This study focuses on the effects of p H and fluoride at different molar ratios of fluoride to Al（R F：Al） on the removal of cadmium（Cd^（2＋）） and phosphate by Al coagulation. Fluoride at R F：Al≥ 3：1 inhibits the removal of Cd over wide Al dose ranges from 5 to 10 mg/l as Al. The removal of phosphate decreases significantly at high R F：Al of 10：1 whereas at lowered R F：Al（i.e., ≤ 6：1）, an adverse effect is observed only at insufficient Al doses below 2 mg/l. Fluoride shows inhibitive effects towards the removal of Cd at p H 7 and 8 and that of phosphate at p H 6. Fluoride decreases the ζ-potential in both systems, and the decreasing extent is positively correlated to the elevated R F：Al. The Al fluoride interactions include the formation of Al-F complexes and the adsorption of fluoride onto Al（OH）3 precipitates, i.e., the formation of Al（OH）n F m. Al-F complex formation inhibits Al hydrolysis and increases residual Al levels, and a more significant increase was observed at lower p H. Al-F complexes at high R F：Al complicate the coagulation behavior of Al towards both negative and positive ionic species. Moreover, fluoride at low R F：Al shows little effect on Al coagulation behavior towards Cd^2＋and phosphate, and the spent defluoridation adsorbent,i.e., aluminum（Al） hydro（oxide） with adsorbed fluoride at R F：Al of below 0.1：1, may be reclaimed as a coagulant after being dissolved.

关键词： Fluoride Aluminum coagulation Al-F complexes ζ-Potential Adsorbent reclamation

EXPERIMENTAl APPlICATION OF A THINNING SCHEME FOR THE ASSIMIlATION OF SuRFACE OBSERVATION DATA IN GRAPES-3DVAR

在线全文

学校读者我要写书评

暂无评论

Journal of Tropical Meteorology 2018年第3期24卷 334-345页

作者： ZHAO Hong l.u Yin luhe Meteorological Bureau Nanjing 211599 China Jiangsu Meteorological Observation Center Nanjing 210009 China Jiangsu Institute of Meteorological Sciences Nanjing 210009 China

To reduce the spatial correlation of representation error in observations and computational complexity, we propose a thinning scheme that can extract typical observations within a certain range. This scheme is applied to the Global/Regional Assimilation and Prediction System(GRAPES) with three-dimensional variation(3 DVAR) to study the effect of the thinning radius on the assimilation results. The assimilation experiments indicate that when the ratio of the model resolution to the observational resolution is 1:3, the simulated results for precipitation are relatively good and have a relatively high equitable threat score(ETS). Moreover, the analysis errors in the temperature and the specific humidity are the smallest, the dependence of the norm gradient vector of the objective function on the number of iterations is slow, gentle, and close to 0, and the minimization results in improved conditions.

关键词： thinning typical observation data assimilation

utilization of aluminum hydroxide waste generated in fluoride adsorption and coagulation processes for adsorptive removal of cadmium ion

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2016年第3期10卷 467-476页

作者： Jiawei Ju Ruiping l.u Zan HE huijuan l.u Xiwang ZHANG Jiuhui Qu State Key laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China university of Chinese Academy of Sciences Beijing 100039 China Department of Chemical Engineering Monash University Clayton VIC 3800 Australia

Although Al-based coagulation and adsorption processes have been proved highly efficient for fluoride （F） removal, the two processes both generate large amount of AI（OH）3 solid waste containing F （Al（OH）3-F）. This study aimed to investigate the feasibility of utilizing AI（OH）3-F generated in AI（OH）3 adsorption （Al（OH）3-Fads） and coagulation （Al（OH）3-Fcoag） for the adsorption of cadmium ion （Cd（II））. The adsorption capacity of AI（OH）3- Fads and Al（OH）a-Fcoag for Cd（II） was similar as that of pristine aluminum hydroxide （AI（OH）3）, being of 24.39 and 19.90 mg·g^-1, respectively. The adsorption of Cd（II） onto AI（OH）a-Fads and AI（OH）a-Fcoag was identified to be dominated by ion-exchange with sodium ion （Na^＋） or hydrogen ion （H^＋）, surface microprecitation, and electrostatic attraction. The maximum concentration of the leached fluoride from Al（OH）a-Fads and Al（OH）3-Feoag is below the Chinese Class-I Industrial Wastewater Discharge Standard for fluoride （〈 10mg·l^-1）. This study demonstrates that the AI（OH）3 solid wastes generated in fluoride removal process could be potentially utilized as a adsorbent for Cd（II） removal.

关键词： Al(OH)3 fluoride cadmium adsorption reclamation sequential extraction

Fighting against fall armyworm by using multiple genes pyramiding and silencing(MGPS) technology

在线全文

学校读者我要写书评

暂无评论

Science China(life Sciences) 2019年第12期62卷 1703-1706页

作者： Maozhi Ren Muhammad Mubashar Zafar huijuan Mo Zhaoen Yang Fuguang li Zhengzhou Research Base State Key Laboratory of Cotton BiologyZhengzhou UniversityZhengzhou 450000China Institute of Cotton Research Chinese Academy of Agricultural SciencesAnyang 455000China

The pest Fall Armyworm(FAW),Spodoptera frugiperda belonging to the order lepidoptera,is one of the most devastating insect pests resulting in severe economic losses to maize,rice,wheat,cotton and soybean in South America,Africa and *** consists of two morphologically indistinguishable strains:the“corn strain”feeding mainly on maize,cotton and sorghum;the“rice strain”mostly feeding on rice and various grasses(Gouin et al.,2017).Adults of FAW have strong migration ability to fly 100 km per *** 2018 it was detected in India and then spreads to Bangladesh,Thailand,Myanmar,and China in 2019(http://***/fall-armyworm/en/).It is a polyphagous lepidopteran herbivore,attacks more than 350 plant species,and causes destructive damage to many economically important *** FAW causes up to 30%-60% yield losses.

关键词： soybean pyramid maize

Characterization and Three-dimensional Structural Modeling of Humic Acid via Molecular Mechanics and Molecular Dynamic Simulation

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese universities 2013年第6期29卷 1180-1184页

作者： ZHAO Nan l.u) Yi-zhong lI Guang-jun College of Resources and Environmental Sciences China Agricultural University Beijing 100193 P.R.China School of Chemistry and Environment Beijing University of Aeronautics and AstronauticsBeijing 100191 P.R.China

The humic acid（HA） sample obtained from the al.uvial soil was characterized by elemental composition, pyrolysis gas chromatography-mass spectrometry（Py-GC-MS） and solid-state 13C nuclear magnetic resonance （13C NMR） spectroscopy. There is high fat content and a few nitrogen-containing functional groups in HA. Py-GC-MS demonstrates the characterization and structural identification of HA. One long list of identified pyrolysis products was proposed for the construction of conceptual model of HA. Solid-state 13C NMR data indicate there are higher values of alkyl-C, O-alkyl-C and aryl-C in HA. The elemental composition, structural carbon distribution and l3C NMR spectroscopy of simulated HA are consistent with those of experimental HA. HyperChem was used to simulate the three-dimensional molecular structure of the monomer, which was optimized by the molecular mechanics of the optimized potential for liquid simulations（OPlS） force field and molecular dynamics simulation to get the stable and balanced conformation. The deprotonation process study depicts that the degree of ionization of HA gets deeper, while the electronegativity of HA and the energy of van der Waals（vdW） increase. Moreover, the 3D structure of humic acid with -4 charges is the most stable. The deprotonation process is an endothermic process.

关键词： Al.uvial soil Humic acid Conceptual model Elemental analysis Pyrolysis gas chromatography-mass spectrometry(Py-GC-MS) 13C nuclear magnetic resonance(13C NMR) Molecular simulation Three-dimensional structure Optimized potential for liquid simulatio

Genes associated with Alzheimer's disease affecting ischemic neurodegeneration of the hippocampal CA3 region

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

Neural Regeneration Research 2021年第7期16卷 1392-1393页

作者： Ryszard Pluta Marzena ułamek-Kozioł laboratory of Ischemic and Neurodegenerative Brain Research Mossakowski Medical Research CentrePolish Academy of SciencesWarsawPoland

Neurodegeneration in the brain after ischemia with reperfusion mimicking the neuropathology of Alzheimer's disease:Brain ischemia with reperfusion,which is one of the main causes of morbidity and mortality in the world,triggers various neuropathological changes characteristic for Alzheimer's disease(AD)such as increased blood-brain barrier permeability,excitotoxicity,necrosis,autophagy,mitophagy,apoptosis,neuroinflammation,amyloid plaques,neurofibrillary tangles,cerebral vessel pathology,and brain atrophy that lead to the death of neurons,deteriorating motor,sensory and cognitive functions(Figure 1)(Kato et al.,1988;Wisniewski et al.,1995;Van Groen et al.,2005;Kocki et al.,2015;ułamek-Koziołet al.,2016,2017,2019).Brain ischemia is recognized as a major contributor to the dysfunction of an aging brain and the development of neurodegenerative diseases,including AD(Pluta,2019).

关键词： Alzheimer ischemia cerebral

In search of a pan-coronavirus vaccine:next-generation vaccine design and immune mechanisms

在线全文

学校读者我要写书评

暂无评论

Cel.ular & Molecular Immunology 2024年第2期21卷 103-118页

作者： S.Cankat M.u.Demael l.Swadling Division of Infection and Immunity Institute of Immunity and TransplantationUniversity College LondonPears BuildingLondon NW32PPUK

Members of the coronaviridae family are endemic to human populations and have caused several epidemics and pandemics in recent *** this review,we will discuss the feasibility of and progress toward the ultimate goal of creating a pan-coronavirus vaccine that can protect against infection and disease by all members of the coronavirus *** will detail the unmet clinical need associated with the continued transmission of SARS-CoV-2,MERS-CoV and the four seasonal coronaviruses(HCoV-OC43,Nl63,HKu1 and 229E)in humans and the potential for future zoonotic *** will highlight how first-generation SARS-CoV-2 vaccines and natural history studies have greatly increased our understanding of effective antiviral immunity to coronaviruses and have informed next-generation vaccine *** will then consider the ideal properties of a pan-coronavirus vaccine and propose a blueprint for the type of immunity that may offer ***,we will describe a subset of the diverse technologies and novel approaches being pursued with the goal of developing broadly or universally protective vaccines for coronaviruses.

关键词： Vaccine Coronavirus Cross-reactive immunity Cross-protection universal