检索结果-南通市图书馆

Effect of Data Augmentation of Renal Lesion Image by Nine-layer Convolutional Neural Network in Kidney CT

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2020年第9期124卷 1001-1015页

作者： liying wang Zhiqiang Xu Shuihua wang School of Education Science Nanjing Normal UniversityNanjing210097China Unit of Urology Tongliao Hospital of Inner MongoliaTongliao028000China Guangxi Key Laboratory of Trusted Software Guilin University of Electronic TechnologyGuilin541004China School of Mathematics and Actuarial Science University of LeicesterLeicesterLE17RHUK School of Architecture Building and Civil Engineering Loughborough UniversityLoughboroughLE113TUUK

Artificial Intelligence(AI)becomes one hotspot in the field of the medical images analysis and provides rather promising *** some research has been explored in smart diagnosis for the common diseases of urinary system,some problems remain unsolved completely A nine-layer Convolutional Neural Network(CNN)is proposed in this paper to classify the renal Computed Tomography(CT)*** group of comparative experiments prove the structure of this CNN is optimal and can achieve good performance with average accuracy about 92.07±1.67%.Although our renal CT data is not very large,we do augment the training data by affine,translating,rotating and scaling geometric transformation and gamma,noise transformation in color *** results validate the Data Augmentation(DA)on training data can improve the performance of our proposed CNN compared to without DA with the average accuracy about 0.85%.This proposed algorithm gives a promising solution to help clinical doctors automatically recognize the abnormal images faster than manual judgment and more accurately than previous methods.

关键词： Artificial intelligence convolutional neural network data augmentation renal lesion computed tomography image

Study on the stability of switched dissipative Hamiltonian systems

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

Science in China(Series F) 2006年第5期49卷 578-591页

作者： ZHU liying wang Yuzhen School of Control Science and Engineering Shandong University Jinan 250061 China

The hybrid Hamiltonian system is a kind of important nonlinear hybrid systems. Such a system not only plays an important role in the development of hybrid control theory, but also finds many applications in practical control designs for obtaining better control performances. This paper investigates the stability of switched dissipative Hamiltonian systems under arbitrary switching paths. Under a realistic assumption, it is shown that the Hamiltonian functions of all the subsystems can be used as the multiple-Lyapunov functions for the switched dissipative Hamiltonian system. Based on this and using the dissipative Hamiltonian structural properties, this paper then proves that the P-norm of the state of switched dissipative Hamiltonian system converges to zero with the time increasing, and presents two sufficient conditions for the asymptotical stability under arbitrary switching paths. Utilizing these new results, this paper also obtains two useful corollaries for the asymptotical stability of switched nonlinear time-invariant systems. Finally, two examples are studied by using the new results proposed in this paper, and some numerical simulations are carried out to support our new results.

关键词： switched Hamiltonian system multiple-Lyapunov functions asymptotical stability dissipative structure sufficient condition.

Phosphorus speciation in surface sediments of a hypertrophic lake,Southwestern China:insights from fractionation and ^(31)P NMR

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2015年第2期34卷 167-176页

作者： Runyu Zhang liying wang Fengchang Wu State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of Sciences Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of Education Chinese Research Academy of Environmental Sciences

Phosphorus(P) species in surface sediments from a shallow,hypertrophic lake,Lake Dianchi,China,were investigated by P fractionation and ^(31)P nuclear magnetic resonance(NMR) spectroscopy during a regional algal *** addition,their potential contributions to the overlying water were also *** fractions of P extracted by NH_4C1,bicarbonate dithionite and NaOH ranged from 340.6 to 1,725.8 mg kg^(-1),accounting for20.5%-67.2%of the total P.A two-step extraction method refinement of P recovery was performed before the^(31)P NMR *** rates of sedimentary TP and organic P,by combining EDTA pretreatment and NaOH or mixed reagents,ranged from 31.8%to 69.3%and from19.8%to 51.7%.^(31)P NMR results showed that ortho-P and monoester-P were the most abundant P components in the sediment extractable P of sediments,followed by diester-P and *** distribution of the sum of ortho-P,diester-P and pyro-P detected by P NMR corresponded well with the labile P concentration determined by *** exhibited a significant positive correlation with the total P in the water column,suggesting that internal loading may be an important source of P for the lake *** P other than ortho-P may contribute to phytoplankton growth,with the relative proportion being 4.4%-18.7%.The release of labile P fractions fueled algal bloom,and the decay of organic matter,following the bloom events,consumed oxygen and elevated the pH *** co-dependence might lead to a vicious *** mechanisms of various P species remain ambiguous and are worthy of further investigation.

关键词：表层沉积物 NMR分析中国西南地区湖泊生态系统磷形态分馏肥大连二亚硫酸钠

Effect of pH on binding of pyrene to hydrophobic fractions of dissolved organic matter(DOM) isolated from lake water

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2016年第3期35卷 288-293页

作者： Yi Mei Yingchen Bai liying wang State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences State Environmental Protection Key Laboratory for Lake Pollution Control Research Center of Lake EnvironmentChinese Research Academy of Environmental Sciences

In order to better understand the compositional and structural complexity of dissolved organic matter(DOM) macromolecules and provide mechanistic information on the binding of hydrophobic organic contaminants(HOCs) to DOM, we fractionated large amounts of lake water into three hydrophobic DOM-fractions. The variation of the partitioning coef?cients(K_(DOC)) of pyrene at different p H levels was examined by ?orescence quenching titration. Results show that, relative to the more polar acidic DOM-fractions, the hydrophobic neutral fraction exhibits a higher sorption ability to pyrene. Generally, the sorption of pyrene to the three hydrophobic fractions is strongly pH-dependent. The K_(DOC) values of pyrene generally increase with decreasing p H levels, which is especially obvious in the sorption of pyrene to the fulvic acid fractions, suggesting that the binding is controlled by hydrophobic interactions. The mechanisms underlying the binding of pyrene to the hydrophobic fractions were also discussed. Our data are bene?cial to further understanding the binding of HOCs to DOM and how it has been affected,which may result in more accurate predictions of K_(DOC).

关键词：疏水性有机污染物溶解有机物 DOM 酸组分 pH值分离湖水绑定

Experimental,numerical and sensitive analysis of nitrogen dynamics in soils irrigated with treated sewage

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2009年第11期52卷 3279-3286页

作者： ZHU Yan YANG JinZhong wang liying State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China

An ammonia volatilization submodel and a crop-growth submodel have been set up and incorporated to the 2D nitrogen transport and transformation simulation model Nitrogen-2D. The coupled model Nitrogen-2D considers all the important nitrogen transformation processes such as mineralization, immobilization, denitrification, nitrification, volatilization, root uptake and soil adsorption in the soil. The model was used to simulate the nitrogen dynamics for the experiment in four lysimeters under sewage irrigation. Simulation results show that the model can describe the water content and ammonium nitrogen content distribution well but simulate the change of the nitrate nitrogen poorly. Sensitivity analysis shows that the simulation results are influenced by the soil water characteristic parameters severely, especially by the parameter of n. The model is much less sensitive to N dynamic parameters.

关键词： Nitrogen-2D nitrogen transformation and transport ammonia volatilization crop-growth model sensitivity analysis

Atmospheric eddy anomalies associated with the wintertime North Pacific subtropical front strength and their influences on the seasonal-mean atmosphere

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2016年第10期59卷 2022-2036页

作者： wang liying HU HaiBo YANG XunQun REN XueJuan CMA-NJU Joint Laboratory for Climate Prediction Studies Instituted for Climate and Global Change Research School of Atmospheric Science Nanjing University

This study investigates transient eddy activity anomalies in the mid-latitude upper troposphere associated with intensity variability of the wintertime North Pacific subtropical front. Our results show that the meridional gradient of air temperature and baroclinic instability in the mid-latitude atmosphere become stronger as the subtropical front intensifies, and the mid-latitude westerly jet accelerates with barotropic structure. We further divide the mid-latitude atmospheric eddy activities into high-(2–7 days) and low-frequency(10–90 days) eddy activities according to their life periods. We find that, when the oceanic subtropical front intensifies, the high-frequency atmospheric eddy activity in the mid-latitudes strengthens while the low-frequency eddy activity weakens. The stronger high-frequency eddy activity tends to moderate the air temperature gradient and baroclinicity in the mid-latitudes. High-frequency eddy anomalies accelerate the westerly jet on the northern side and downstream of the westerly jet, and enhance the jet with equivalent barotropic structure. In contrast, the weaker low-frequency eddy activity has a negative contribution to zonal wind speed tendency and attenuates the zonal homogenization of the jet. The anomalous thermodynamic forcing of the low-frequency eddy activity helps maintain the meridional gradient of air temperature in the mid-troposphere.

关键词： North Pacific subtropical front Frequency Eddy activity Mid-Latitude Ocean-Atmosphere interaction

Phosphorus speciation in the sediment profile of Lake Erhai, southwestern China: Fractionation and ^(31)P NMR

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2013年第6期25卷 1124-1130页

作者： Runyu Zhang liying wang Fengchang Wu Baoan Song State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of Sciences State Environmental Protection Key Laboratory for Lake Pollution Control Chinese Research Academy of Environmental Sciences Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education

The distribution characteristics of phosphorus （P） forms in the sediment profile of Lake Erhai, in southwestern China has been investigated by sequential extraction and 31p nuclear magnetic resonance spectroscopy （NMR） of NaOH extracts to understand P dynamics and its potential contribution to lake eutrophication. Contents of P fractions varied in the order of NH4C1 extracted P （NH4C1- P）〈 bicarbonate-dithionite extracted P （BD-P）〈 HC1-P, Residual-P 〈 NaOH extracted P （NaOH-P）. The highly available NH4C1-P represented less than 1% of total P （TP）. BD-P and NaOH extracted reactive P （NaOH-rP） averaged 39%, while the ratio of Fe/P was higher than 15, indicating low P release from the sediments under permanent oxic condition. The less bio-available HC1-P, NaOH extracted nonreactive P （NaOH-nrP） and residual-P contributed 61% of TP. Regression analysis revealed that BD-P, NaOH-rP and HC1-P were positively correlated with the contents of Fe and Mn, A1 and Fe, and Ca, respectively. The investigation of P compound groups in NaOH extracts by 31p NMR showed that ortho-P and monoester-P were the largest two constituents of the P pool, followed by diester-P, phosphonate and pyro-P. A comparison of vertical variations of P groups in the sediment profile suggested that these compounds were involved in the P recycling to different extents in Lake Erhai. In particular, the lake exhibits high potential for labile P release from the surface sediments, which should be taken into consideration even after the outsourced P runoff ceased.

关键词： phosphorus speciation fractionation 31p NMR sediment eutrophication

CO_(2) emissions reduction performance of China’s HSR based on substitution effect and demand effect

在线全文

学校读者我要写书评

暂无评论

Transportation Safety and Environment 2023年第3期5卷 38-45页

作者： liying wang Ping Yin Shangqing Liu School of Economics and Management Beijing Jiaotong UniversityBeijing 100044China

As an important transportation infrastructure and transportation backbone in China,high-speed rail(HSR)plays a critical role in promoting the development of green and low-carbon *** the CO_(2) emissions reduction performance of HSR will be conduci v e to pr omote the CO_(2) emissions r eduction w ork of the r ail w *** on the Dalkic HSR CO_(2) emissions r eduction performance model,by adjusting the HSR CO_(2) emission factor(CEF HSR),the annual times of departures(T)and other parameters,this study develops a Chinese HSR CO_(2) emissions reduction performance *** the Beijing-Shanghai HSR as the resear c h object,this study conducts a questionnaire survey to explore the substitution effect and demand effect of HSR on different transportation modes;collects data such as passenger v olume,av era ge electricity use and annual times of departures of the Beijing-Shanghai HSR in 2019;and calculates the CO_(2) emissions reduction performance of the Beijing-Shanghai *** study has two main results:(1)It builds a Chinese HSR CO_(2) emissions reduction performance model based on substitution effect and demand effect.(2)In 2019,the CO_(2) emissions of the Beijing-Shanghai HSR are 2898233.62 t,the CO_(2) emissions reduction performance of the Beijing-Shanghai HSR is 17999482.8 t,the annual CO_(2) emissions of the Beijing-Shanghai line in‘No HSR’case are 7.2 times as in the’HSR’case and the PKT of the HSR is 10.2 g/*** on the research results,this study proposes three CO_(2) emissions reduction policy *** study would be helpful for further HSR CO_(2) emissions reduction resear c h and departments related to railway transportation management to make CO_(2) emissions reduction policies.

关键词： high-speed rail(HSR) CO_(2)emissions CO_(2)emissions reduction performance model Beijing-Shanghai HSR

Transcriptome Analyses Implicate Endogenous Retroviruses Involved in the Host Antiviral Immune System through the Interferon Pathway

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

Virologica Sinica 2021年第6期36卷 1315-1326页

作者： Miao wang liying wang Haizhou Liu Jianjun Chen Di Liu CAS Key Laboratory of Special Pathogens and Biosafety Wuhan Institute of VirologyChinese Academy of SciencesWuhan 430071China Computational Virology Group Center for Bacteria and Viruses Resources and BioinformationWuhan Institute of VirologyChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China First Affiliated Hospital of Xinjiang Medical University Urumqi 830054China

Human endogenous retroviruses(HERVs) are the remains of ancient retroviruses that invaded our ancestors’ germline cell and were integrated into the genome. The expression of HERVs has always been a cause for concern because of its association with various cancers and diseases. However, few previous studies have focused on specific activation of HERVs by viral infections. Our previous study has shown that dengue virus type 2(DENV-2) infection induces the transcription of a large number of abnormal HERVs loci;therefore, the purpose of this study was to explore the relationship between exogenous viral infection and HERV activation further. In this study, we retrieved and reanalyzed published data on 21 transcriptomes of human cells infected with various viruses. We found that infection with different viruses could induce transcriptional activation of HERV loci. Through the comparative analysis of all viral datasets, we identified 43 key HERV loci that were up-regulated by DENV-2, influenza A virus, influenza B virus, Zika virus, measles virus, and West Nile virus infections. Furthermore, the neighboring genes of these HERVs were simultaneously up-regulated, and almost all such neighboring genes were interferon-stimulated genes(ISGs), which are enriched in the host’s antiviral immune response pathways. Our data supported the hypothesis that activation of HERVs, probably via an interferon-mediated mechanism, plays an important role in innate immunity against viral infections.

关键词： Human endogenous retrovirus(HERV) RNA-seq Virus infection Interferon-stimulated genes(ISGs)