检索结果-南通市图书馆

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第1期12卷 28-31页

作者： Wu JIANG Bo zhang Yan-biao FU Jia-wei WANG shun-liang GAO Su-zhan zhang Yu-lian WU Department of Surgical Oncology the Second Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310009 China Department of General Surgery the Second Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310009 China Department of Pathology the Second Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310009 China Department of Radiology the Second Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310009 China

Gastric duplication cyst (GDC) lined by pseudostratified columnar ciliated epithelium (PCCE) is an uncommon lesion stemming from a foregut developmental *** clinical and radiological presentation is usually *** this study,we reported a 76-year-old man who presented with an incidentally found perigastric *** exploratory laparotomy revealed a non-communicating cyst below the gastroesophageal junction,measuring 4 cm×4 cm in ***,the gastric cyst was lined merely by *** rare,GDC lined by PCCE should be included in the differential diagnosis of gastric wall *** intervention is warranted in patients who have clinical symptoms,or who are aged more than 50 years.

关键词： Gastric duplication cyst (GDC) Foregut Pseudostratified columnar ciliated epithelium (PCCE) Endoscopic ultrasound-guided fine needle aspiration (EUS-FNA)

Green manuring relocates microbiomes in driving the soil functionality of nitrogen cycling to obtain preferable grain yields in thirty years

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2024年第3期67卷 596-610页

作者： Guopeng Zhou Kunkun Fan Songjuan Gao Danna Chang Guilong Li Ting liang Hai liang shun Li Jiudong zhang Zongxian Che Weidong Cao State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China/Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural SciencesBeijing 100081China State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China College of Resources and Environmental Sciences Nanjing Agricultural UniversityNanjing 210095China Institute of Soil&Fertilizer and Resource&Environment Jiangxi Academy of Agricultural SciencesNanchang 330200China Institute of Soil and Fertilizer and Water-saving Agriculture Gansu Academy of Agricultural SciencesLanzhou 730070China

Fertilizers are widely used to produce more food, inevitably altering the diversity and composition of soil organisms. The role of soil biodiversity in controlling multiple ecosystem services remains unclear, especially after decades of fertilization. Here, we assess the contribution of the soil functionalities of carbon(C), nitrogen(N), and phosphorus(P) cycling to crop production and explore how soil organisms control these functionalities in a 33-year field fertilization experiment. The long-term application of green manure or cow manure produced wheat yields equivalent to those obtained with chemical N, with the former providing higher soil functions and allowing the functionality of N cycling(especially soil N mineralization and biological N fixation) to control wheat production. The keystone phylotypes within the global network rather than the overall microbial community dominated the soil multifunctionality and functionality of C,N, and P cycling across the soil profile(0–100 cm). We further confirmed that these keystone phylotypes consisted of many metabolic pathways of nutrient cycling and essential microbes involved in organic C mineralization, N_(2)O release, and biological N fixation. The chemical N, green manure, and cow manure resulted in the highest abundances of amoB, nifH, and GH48 genes and Nitrosomonadaceae,Azospirillaceae, and Sphingomonadaceae within the keystone phylotypes, and these microbes were significantly and positively correlated with N_(2)O release, N fixation, and organic C mineralization, respectively. Moreover, our results demonstrated that organic fertilization increased the effects of the network size and keystone phylotypes on the subsoil functions by facilitating the migration of soil microorganisms across the soil profiles and green manure with the highest migration rates. This study highlights the importance of the functionality of N cycling in controlling crop production and keystone phylotypes in regulating soil functions, an

关键词： soil biodiversity soil multifunctionality element cycling keystone phylotypes

Extended Group Foliation Method and Functional Separation of Variables to Nonlinear Wave Equations

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第4X期44卷 577-582页

作者： QU Chang-Zheng zhang shun-Li Center for Nonlinear Studies Northwest University Xi'an 710069 China Department of Mathematics Northwest University Xi'an 710069 China

Generalized functional separation of variables to nonlinear evolution equations is studied in terms of the extended group foliation method, which is based on the Lie point symmetry method. The approach is applied to nonlinear wave equations with variable speed and external force. A complete classification for the wave equation which admits functional separable solutions is presented. Some known results can be recovered by this approach.

关键词： symmetry group group foliation method nonlinear wave equation functional separation of variables

Symmetry Reduction and Cauchy Problems for a Class of Fourth-Order Evolution Equations

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第7期50卷 31-38页

作者： LI Ji-Na zhang shun-Li Center for Nonlinear Studies Department of Mathematics Northwest University Xi＇an 710069 China Center of Nonlinear Science Ningbo University Ningbo 315211 China

We exploit higher-order conditional symmetry to reduce initial-value problems for evolution equations toCauchy problems for systems of ordinary differential equations (ODEs).We classify a class of fourth-order evolutionequations which admit certain higher-order generalized conditional symmetries (GCSs) and give some examples to showthe main reduction *** reductions cannot be derived within the framework of the standard Lie approach,which hints that the technique presented here is something essential for the dimensional reduction of evolu tion equations.

关键词： fourth-order evolution equation generalized conditional symmetry Cauchy problem

Exploring multiple equilibria for symmetric 2×2 CES/LES pure exchange economies

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2010年第2期25卷 137-154页

作者： SHI Xiao-jun zhang shun-ming School of Economics and Management Beijing University of Aeronautics and Astronautics Beijing 100191 China China Financial Policy Research Center Renmin University of China Beijing 100872 China

This paper explores the existence of 3 equilibria for symmetric 2-individual 2-good CES/LES pure exchange economies. For certain parameterizations in the economies, we show analytically that there are no more than 3 equilibria. We generalize our analytical results of existence of 3 equilibria for a wide range of parameterizations. Then we provide examples of 3 equilibria and parameter zones of 3 equilibria for CES and CES/LES economies.

关键词： Multiple equilibria Cobb-Douglas utility function CES/LES utility function.

Evaluate the impact of sensor accuracy on model performance in data-driven building fault detection and diagnostics using Monte Carlo simulation

在线全文

学校读者我要写书评

暂无评论

Building Simulation 2022年第5期15卷 769-778页

作者： liang zhang Matt Leach National Renewable Energy Laboratory 15013 Denver W PkwyGoldenCOUSA

The performance of data-driven fault detection and diagnostics(FDD)is heavily dependent on ***,sensor inaccuracy and sensor faults are pervasive in building operation:inaccurate and missing sensor readings deteriorate FDD performance;sensor inaccuracy will also affect the selection of sensor for data-driven FDD in the model training process,which is another key factor of data-driven FDD *** accuracy and sensor selection individually are well-studied research topics in this field,but the impact of sensor accuracy on sensor selection and its further impact on FDD performance has not been evaluated and *** this paper,we developed a novel analysis methodology that comprehensively evaluates sensor fault on sensor selection and FDD *** Carlo simulation is applied to deal with multiple stochastic sensor inaccuracy and provide probabilistic analysis results of the impact of sensor inaccuracy on sensor selection and FDD *** methodology focuses on the net impact of fault states across a full sensor *** developed methodology can be used for the early-stage sensor design and operation-stage sensor maintenance.A case study is conducted to demonstrate the analysis methodology using a commercial building model crated to Flexible Research Platform located at Oak Ridge National Laboratory,USA.

关键词： fault detection and diagnostics sensor accuracy sensor fault sensor selection data-driven modeling Monte Carlo simulation

Deep learning-based battery state of charge estimation:Enhancing estimation performance with unlabelled training samples

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 Energy Chemistry 2023年第5期80卷 48-57,I0002页

作者： liang Ma Tieling zhang School of Mechanical MaterialsMechatronic and Biomedical EngineeringUniversity of WollongongNSW 2522Australia

The estimation of state of charge(SOC)using deep neural networks(DNN)generally requires a considerable number of labelled samples for training,which refer to the current and voltage pieces with knowing their corresponding ***,the collection of labelled samples is costly and *** contrast,the unlabelled training samples,which consist of the current and voltage data with unknown SOCs,are easy to *** view of this,this paper proposes an improved DNN for SOC estimation by effectively using both a pool of unlabelled samples and a limited number of labelled *** the traditional supervised network,the proposed method uses an input reconstruction network to reformulate the time dependency features of the voltage and *** this way,the developed network can extract useful information from the unlabelled *** proposed method is validated under different drive cycles and temperature *** results reveal that the SOC estimation accuracy of the DNN trained with both labelled and unlabelled samples outperforms that of only using a limited number of labelled *** addition,when the dataset with reduced number of labelled samples to some extent is used to test the developed network,it is found that the proposed method performs well and is robust in producing the model outputs with the required accuracy when the unlabelled samples are involved in the model ***,the proposed method is evaluated with different recurrent neural networks(RNNs)applied to the input reconstruction *** results indicate that the proposed method is feasible for various RNN algorithms,and it could be flexibly applied to other conditions as required.

关键词： Deep learning State of charge estimation Data-driven methods Battery management system Recurrent neural networks

Selective Laser Melting of In Situ TiB/Ti6Al4V Composites: Formability, Microstructure Evolution and Mechanical Performance

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2020年第6期33卷 774-788页

作者： Yue Su shun-Cun Luo liang Meng Piao Gao Ze-Min Wang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

In the present study, a series of in situ TiB/Ti6Al4V composites were fabricated using selective laser melting. The formability, microstructure evolution and mechanical properties of the as-built samples added with different contents of TiB2 were studied. It is found that the densification level is related to both the content of TiB2 and laser energy density. The added TiB2 reinforcement particle can spontaneously react with titanium and then form the TiB phase. The needle-like TiB phase tends to transform into dot-like particles with the decrease in energy density. Additionally, with the increase in TiB2 content, the TiB phase is coarsened due to the increased nucleation rate and more reactions. The grain morphology is found to largely depend on the translational speed of solid–fluid interface determined by the temperature gradient and cooling rate. Also, the microhardness of the as-built TiB/Ti6Al4V composites is obviously improved. More interestingly, as the energy density increases, the microhardness of the as-built TiB/Ti6Al4V composites firstly increases and then decreases due to the synergy of grain size and different morphologies and distribution of TiB phases. The wear resistance of TiB/Ti6Al4V composites is far superior to that of Ti6Al4V alloy owing to the increased microhardness resulted from the uniform distribution of the hard TiB phase in the matrix.

关键词： Selective laser melting TiB/Ti6Al4V composites Energy density Densification behavior Microhardness Wear resistance

Some remarks on pseudo-umbilical totally real submanifolds in a complex projective space

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2008年第2期23卷 227-232页

作者： zhang liang College of Mathematics and Computer Science Anhui Normal University Wuhu 241000 China

This paper studies the relationship between the pseudo-umbilical totally real submanifolds and the minimal totally real submanifolds in a complex projective space. Two theo- rems which claim that some types of pseudo-... 详细信息

关键词： complex projective space totally real submanifold pseudo-umbilical submanifold minimal submanifold.

Parametric optimization of packed bed for activated coal fly ash waste heat recovery using CFD techniques

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2020年第2期28卷 518-525页

作者： Kai liang Saimeng Jin Hengzhi Chen Jingzheng Ren Weifeng Shen shun'anWei School of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044China Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHong KongChina

Coal fly ash is an industrial solid waste generated from coal preparation during the processing and cleaning of coal for electric power *** investigation on the reutilization of waste heat of activated coal fly ash is of great economic *** method of recovering the waste heat,proposed in this study,is the transfer of heat from activated coal fly ash to gas with the movement of air using the packed bed,providing valuable energy sources for preheating the raw coal fly ash to reduce the overall energy *** investigation is carried on the heat transfer characteristics of gas–solid(activated coal fly ash)phases and air temperature fields of the packed bed under some key conditions via computational fluid dynamics.A two dimensional geometry is utilized to represent key parts of packed *** distribution mechanism of the temperature field for gas phase is analyzed based on the transient temperature contours at different *** results show that the obtained rule of gas–solid heat transfer can effectively evaluate the influences of operating parameters on the air temperature in the packed ***,it is found that no temperature differences exist in the hot air at the outlet of the packed *** investigation provides guidance for the design and optimization of other similar energy recovery apparatuses in industries.

关键词： Coal fly ash Computational fluid dynamics Eulerian–Eulerian model Waste heat recovery Packed bed