检索结果-南通市图书馆

Relationship between nutrients and plankton biomass in the turbidity maximum zone of the Pearl River Estuary

Journal of Environmental Sciences 2017年第7期29卷 72-84页

作者： Zhen Shi Jie Xu xiaoping Huang xia Zhang Zhijian Jiang feng Ye Ximei liang Key Laboratory of Tropical Marine Bio-Resources and Ecology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Key Laboratory of Marginal Sea Geology Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China College of Animal Science and Technology Jiangxi Agricultural UniversityNanchang 330045China

Nutrients,dissolved and particulate organic carbon and plankton（bacterio-,phyto-and zoo-）were compared in the turbidity maximum zone（TMZ） and adjacent areas（non-TMZ） in the Pearl River *** results showed that high levels of suspended substances had marked effect on dynamics of nutrients and plankton in the *** on the cluster analysis of total suspended solids（TSS） concentrations,all stations were divided into two groups,TMZ with average TSS of 171 mg/L and non-TMZ of 45 mg/*** substances adsorbed PO^（3-）_4 and dissolved organic carbon,resulting in higher particulate phosphorus and organic carbon（POC）and lower PO^（3-）_4 and DOC in the TMZ,compared to the ***,suspended substances had limited effect on nitrogenous *** growth was light-limited due to high concentrations of suspended substances in the TMZ and a peak of phytoplankton abundance appeared in the *** contrast,the highest bacterial abundance occurred in the TMZ,which was likely partly responsible for low DOC *** peaks of zooplankton abundance observed in the TMZ and non-TMZ in the Pearl River estuary were primarily supported by bacteria and phytoplankton,*** finding implied that high levels of suspended solids in the TMZ affect the trophic balance.

关键词： Nutrient Plankton Turbidity maximum zone Pearl River estuary

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis of the Biomimetic Polymer: Aliphatic Diamine and RGDS Modified Poly(d,l-lactic acid)

引用

Chinese Chemical Letters 2005年第8期16卷 1035-1038页

作者： Xu feng NIU Yuan liang WANG Yan feng LUO Jun PAN Li xia GUO Key Lab of Biomechanics ＆ Tissue Engineering （Chongqing University） Ministry of Education Bioengineering College of Chongqing University Chongqing 400044

A novel poly（d, /-lactic acid）（PDLLA） based biomimetic polymer was synthesized by grafting maleic anhydride, butanediamine and arg-gly-asp-ser （RGDS） peptides onto the backbone of PDLLA, aiming to overcome the acidity and auto-accelerating degradation of PDLLA during degradation and to improve its biospecificity and biocompatibility. The synthetic copolymer was characterized by FTIR, ^13C NMR and amino acid analyzer （AAA）.

关键词： Poly(d,l-lactic acid) maleic anhydride butanediamine arg-gly-asp-ser modification.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Anticipative Stochastic Differential Equations with Non-smooth Diffusion Coefficient

引用

Acta Mathematica Sinica,English Series 2006年第5期22卷 1473-1480页

作者： Zong xia liang Department of Mathematical Sciences Tsinghua University Beijing 100084 P. R. China

In this paper we prove the existence and uniqueness of the solutions to the one-dimensional linear stochastic differential equation with Skorohod integral Xt（ω）=η（w）＋∫^t 0 asXs（ω）dWs＋∫^t 0 bsXs（ω）ds, t∈[0,1] where （Ws） is the canonical Wiener process defined on the standard Wiener space （W,H,u）, a is non-smooth and adapted, but η and b may be anticipating to the filtration generated by （Ws）. The intention of the paper is to eliminate the regularity of the diffusion coefficient a in the Malliavin sense, in the existing literature. The idea is to approach the non-smooth diffusion coefficient a by smooth ones.

关键词： Non-smooth and anticipative stochastic differential equations Skorohod integral Malliavin derivative

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

黄瓜-酸黄瓜异附加系鉴定、果实长度变异及其分子机制

引用

南京农业大学学报 2025年第1期48卷 108-120页

作者：刘紫薇冯贤波赵勤政夏磊娄群峰南京农业大学园艺学院/作物遗传与种质创新利用全国重点实验室江苏南京210095

[目的]本文旨在通过分析不同黄瓜-酸黄瓜异附加系的果实差异,探究附加系中导入酸黄瓜6号染色体引起黄瓜果实变短的分子机制,为黄瓜近缘野生种优异性状挖掘和利用提供理论依据。[方法]采用分子标记和Oligo-FISH鉴定黄瓜-酸黄瓜异附加系... 详细信息

[目的]本文旨在通过分析不同黄瓜-酸黄瓜异附加系的果实差异,探究附加系中导入酸黄瓜6号染色体引起黄瓜果实变短的分子机制,为黄瓜近缘野生种优异性状挖掘和利用提供理论依据。[方法]采用分子标记和Oligo-FISH鉴定黄瓜-酸黄瓜异附加系中的外源染色体,对栽培黄瓜‘北京截头'(CC3)和不同黄瓜-酸黄瓜异附加系的果实性状进行统计,开展石蜡切片和转录组测序分析,并利用实时荧光定量PCR技术(RT-qPCR)验证转录组测序结果。[结果]共鉴定出7种异附加系材料:附加酸黄瓜6号染色体CC-H06、8号染色体CC-H08、9号染色体CC-H09及10号染色体CC-H10的单体附加系;附加酸黄瓜6和10号染色体CC-H06+H10的双单体附加系;附加酸黄瓜6、7和11号染色体CC-H06+H07+H11以及附加酸黄瓜6、7、10、11和12号染色体CC-H06+H07+H10+H11+H12的多单体附加系。表型统计发现,CC-H08、CC-H09和CC-H10的子房和果实长度均与CC3相似,而CC-H06较CC3明显变短,表明酸黄瓜6号染色体导入会引起CC3果实变短。石蜡切片结果显示,CC-H06的果实细胞相对于CC3较大,但细胞数目却明显减少。转录组分析表明,CC-H06中分别有695和2 770个酸黄瓜及CC3来源的差异表达基因,主要富集在植物激素信号转导、玉米素生物合成、二萜生物合成、色氨酸代谢等激素合成通路。RT-qPCR 验证分析与转录组测定结果一致,说明结果真实可靠。[结论]酸黄瓜6号染色体导入会引起CC3果实变短和果实细胞数量减少,CC-H06的果实变短与生长素、细胞分裂素和赤霉素等植物激素共同调控有关。

关键词：黄瓜酸黄瓜异附加系(ALL) 果实转录组

来源：

维普期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Floral Ontogeny of Two Species in Magnolia L.

引用

Journal of Integrative Plant Biology 2006年第10期48卷 1197-1203页

作者： feng-xia Xu South China Botanical Garden the Chinese Academy of Sciences Guangzhou 510650 China

Floral ontogeny is described in two species of genus Magnolia （Magnollaceae）, Magnolia alboserlcea Chun et C. Tsoong, and M. amoena Cheng, representing subgenus Magnolia and subgenus Yulani In Magnolia, by using scanning electron microscope （SEM）. The sequence of Initiation of floral organs Is from proximal to distal. The three distinct outermost and middle organs are Initiated in sequence, but ultimately form a single whorl, thus their ontogeny Is consistent with a sepal Interpretation. The last three tepals （petals） alternate with the preceding tepal whorl. The members of androeclum and gynoeclum arise spirally, although the androecium shows some Intermedlacy between a spiral and whorled arrangement. The carpel prlmordia initiate in group of four to five. The order of stamen Initiation within each tier Is not determined. The floral ontogeny Is remarkably homogeneous between the subgenus Magnolia and subgenus Yulani that does not support the resuming of genus Yulani.

关键词： floral ontogeny Magnolia albosericea Magnolia amoena subgenus Magnolia subgenus Yulania

来源：

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

Discharge instability in a plasma contactor

引用

Plasma Science and Technology 2020年第9期22卷 87-94页

作者： Kan XIE feng TIAN Fuwen liang Qimeng xia Ningfei WANG School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081People's Republic of China

Like the hollow cathode,discharge instability also occurs during the operation of a plasma *** and current probes were employed to test the change of keeper voltage,keeper current,anode voltage,and anode current parameters with time under different working *** anode current range corresponding to the discharge instability phenomenon is about 0.4 A to 1.2 A,and the emission characteristic curve in this area appears to bulge wherein the four parameters all produce different degrees of oscillation,the anode current oscillation being the *** waveform is considered to consist of a small-amplitude,high-frequency triangular wave and a large-amplitude,low-frequency sawtooth wave,and we have explained the shape of the *** parameter shows hundreds of Hz in oscillation frequency and the phases of the four parameters appear to be *** fast Fourier transform processing,the frequency and amplitude of the main peak of the anode current oscillation tend to change with changes of the anode current,and there are differences in the trends under different keeper currents and xenon flows.

关键词： plasma contactor discharge instability emission characteristics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Model-constrained and data-driven double-supervision acoustic impedance inversion

引用

Petroleum Science 2023年第5期20卷 2809-2821页

作者： Dong-feng Zhao Na-xia Yang Jin-liang Xiong Guo-Fa Li Shu-Wen Guo State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing102249China Dagang Oil Field PetroChinaTianjin300280China Research Institute of Exploration and Development Dagang Oil FieldPetroChinaTianjin300280China

Seismic impedance inversion is an important technique for structure identification and reservoir ***-based and data-driven impedance inversion are the commonly used inversion *** practice,the geophysical inversion problem is essentially an ill-posedness problem,which means that there are many solutions corresponding to the same seismic ***,regularization schemes,which can provide stable and unique inversion results to some extent,have been introduced into the objective function as constrain *** them,given a low-frequency initial impedance model is the most commonly used regularization method,which can provide a smooth and stable ***,this model-based inversion method relies heavily on the initial model and the inversion result is band limited to the effective frequency bandwidth of seismic data,which cannot effectively improve the seismic vertical resolution and is difficult to be applied to complex structural ***,we propose a data-driven approach for high-resolution impedance inversion based on the bidirectional long short-term memory recurrent neural network,which regards seismic data as time-series rather than image-like *** with the model-based inversion method,the data-driven approach provides higher resolution inversion results,which demonstrates the effectiveness of the data-driven method for recovering the high-frequency ***,judging from the inversion results for characterization the spatial distribution of thin-layer sands,the accuracy of high-frequency components is difficult to ***,we add the model constraint to the objective function to overcome the shortages of relying only on the data-driven ***,constructing the supervisor1 based on the bidirectional long short-term memory recurrent neural network,which provides the predicted impedance with higher ***,convolution constraint as supervisor2 is introduced into the objective fu

关键词： Acoustic impedance inversion Model constraints Double supervision BiLSTM neural network Reservoir structure characterization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Solidification and utilization of water-based drill cuttings to prepare ceramsite proppant with low-density and high performance

引用

Petroleum Science 2022年第5期19卷 2314-2325页

作者： Hang Yang Yun-Li Liu Guo-liang Bai Zhen feng Yi Zhang Shi-Bin xia School of Resources and Environmental Engineering Wuhan University of TechnologyWuhan430070HubeiPR China State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan430072HubeiPR China

Water-based drill cuttings(WBDC)and bauxite are used as raw materials to prepare proppants with low density and high *** effects of sintering temperature,sintering period,mixture ratios of materials,doping with iron oxide,and acid modification of WBDC on the properties of proppants are *** proppant performance is evaluated according to the national standard SY/*** morphology of the proppant is analyzed using scanning electron microscopy(SEM).The crystal phase structure of the proppant is studied using X-ray diffraction(XRD).Thermal analysis of the proppant sintering process is performed using thermogravimetry(TG).Proppant Z-23 completely satisfied the SY/T5108-2014 *** study provides a new perspective for the resource utilization of water-based drill cuttings and preparation of low-density proppants.

关键词： Water-based drill cuttings Proppant Thermal analysis Solid waste

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Pd cluster decorated free standing flexible cathode for high performance Li-oxygen batteries

引用

Nano Research 2024年第4期17卷 2678-2686页

作者： liang Guo Guoliang Zhang Ruonan Yang Dongmei Zhang Xiuqi Zhang Han Yu xia Li feng Dang Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials Ministry of EducationShandong UniversityJinan 250061China

As a promising candidate for the next generation energy storage system,rechargeable lithium-oxygen batteries(LOBs)still face substantial challenges caused by insulating discharge products that preclude their practical *** highly efficient cathode catalysts capable of facilitating formation/decomposition of discharge products is considered as an essential approach towards high performance ***,Pd decorated Te nanowires(Pd@Te NWs)were synthesized as advanced catalyst in LOBs to maximize Pd utilization and achieve synergistic effect,in which Pd clusters were uniformly grown on Te substrate though regulating the Pd:Te ***,Pd@Te nanowires assembled into an interpenetrating network-like structure by vacuum filtration and employed as flexible cathode,enabling LOBs achieved an ultralong 190 cycles stability and a superior specific capacity of 3.35 mAh·cm^(-2).Experimental studies and density functional theory(DFT)calculations reveal the excellent catalytic ability of Pd@Te and synergistic catalytic mechanism of Pd and Te,in which uniform electron distribution,extensive electron exchange,and large adsorption distance between Pd cluster and discharge products promote homogeneous adsorption/desorption of discharge products,while the high adsorption energy of Te substrate for Li species reduces the initial dynamical energy barrier during discharging *** current work provides viable strategy to design composite catalysts for flexible cathode of LOBs with synergistic catalytic effects.

关键词： flexible lithium-oxygen batteries Pd@Te synergistic catalysis cathode catalysts density functional theory(DFT)calculation

来源：

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

Ultrasonic vibration assisted tungsten inert gas welding of dissimilar metals 316L and L415

引用

International Journal of Minerals,Metallurgy and Materials 2020年第7期27卷 943-953页

作者： Hong-xia Lan Xiu-fang Gong Sen-feng Zhang liang Wang Bin Wang Li-ping Nie School of New Energy and Materials Southwest Petroleum UniversityChengdu 610500China State Key Laboratory of Long-life High Temperature Materials Dong Fang Turbine Co.Ltd.Deyang 618000China China National Erzhong Group Deyang Wanhang Die Forging Co. Ltd.Deyang 618000China School of Engineering Southwest Petroleum UniversityNanchong 637800China

Ultrasonic vibration assisted tungsten inert gas welding was applied to joining stainless steel 316 L and low alloy high strength steel *** effect of ultrasonic vibration on the microstructure and mechanical properties of a dissimilar metal welded joint of 316 L and L415 was systematically *** microstructures of both heat affected zones of L415 and weld metal were substantially refined,and the clusters ofδferrite in traditional tungsten inert gas(TIG)weld were changed to a dispersive distribution via the ultrasonic *** ultrasonic vibration promoted the uniform distribution of elements and decreased the micro-segregation tendency in the *** the application of ultrasonic vibration,the average tensile strength and elongation of the joint was improved from 613 to 650 MPa and from 16.15%to31.54%,*** content ofΣ3 grain boundaries around the fusion line zone is higher and the distribution is more uniform in the ultrasonic vibration assisted welded joint compared with the traditional one,indicating an excellent weld metal crack resistance.

关键词： ultrasonic vibration dissimilar metal welding microstructure mechanical properties micro-segregation electron backscatter diffraction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：