检索结果-南通市图书馆

Two integrable generalizations of WKI and FL equations: Positive and negative flows, and conservation laws

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第5期29卷 70-73页

作者： Xian-Guo Geng Fei-Ying Guo yun-yun zhai School of Mathematics and Statistics Zhengzhou UniversityZhengzhou 450001China

With the aid of Lenard recursion equations, an integrable hierarchy of nonlinear evolution equations associated with a 2 × 2 matrix spectral problem is proposed, in which the first nontrivial member in the positive flows can be reduced to a new generalization of the Wadati–Konno–Ichikawa(WKI) equation. Further, a new generalization of the Fokas–Lenells(FL) equation is derived from the negative flows. Resorting to these two Lax pairs and Riccati-type equations, the infinite conservation laws of these two corresponding equations are obtained.

关键词： integrable generalizations positive flow and negative flow infinite conservation laws

A growing social networks model of physical objects in IoT

在线全文

学校读者我要写书评

暂无评论

High Technology Letters 2018年第2期24卷 163-168页

作者： Li Ali zhai yun School of Computer and Communication Engineering University of Science and Technology Beijing Beijing 100083 P. R. China School of Information and Electrical Engineering Ludong University Yantai 264025 P. R. China E-Government Research Center Chinese Academy of Governance Beijing 100089 P. R. China

In Internet of Things （IoT） cial networks of physical objects , physical objects can build their own social networks. How do so- generate, and what characteristics do the social networks have. In order to solve these problems, according to the interaction of physical objects in IoT, this paper presents a growing social network model of physical objects and researches the attachment mecha- nism of the model that includes three modes, physical distance, social distance and preference. Through the simulation realizations of the model, the characteristics （e. g. degree distribution, com- munity structure） of social network are analyzed. The model can forecast the growth of social networks of physical object in IoT and simulate social networks of physical objects in the large scale IoT.

关键词： Internet of Things(IoT) social networks physical objects

A New Algorithm for Literature Recommendation Based on a Bibliographic Heterogeneous Information Network

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2018年第4期27卷 761-767页

作者： LI Linna WANG Lijun JIANG Xueqin HAN Hongqi zhai yun Institute of Scientific and Technical Information of China E-Government Research Center Chinese Academy of Governance

A literature recommendation algorithm based on a heterogeneous information network is proposed. The proposed algorithm can process different types of semantic information and implicit feedback. The experimental results show that the proposed algorithm can provide more effective recommendations than those algorithms without employing these semantic information and implicit feedback.

关键词： Literature recommendation algorithm Heterogeneous information network Meta-path Classification Bayesian ranking

Effects of Shallow Groundwater Table on Soil Matric Potential and Hydraulic Characteristics

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2014年第6期20卷 463-468页

作者： Jiang Jianmei Zhao Lin Qi yun zhai Zhe School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China School of Environmental Science and Engineering Tianjin UniversityTianjin 300072China

Groundwater recharge significantly affects soil moisture redistribution through capillary rise. In this study,the soil matric potential at depths of 5, 10, 20 and 30 cm above the groundwater tables of 10, 30 and 60 cm weremeasured for 5 d. Soil hydraulic properties were analyzed by using the Philips and de Vries model. Results showedthat evaporation mainly influenced the matric potential of the shallow layer at the 5 cm depth regardless of the saturationof the layer. Groundwater recharge mainly affected soil moisture at the depth of 20 cm or more. A constant matricpotential layer existed between the evaporation front and capillary rise front where moisture content did not *** isothermal-liquid hydraulic conductivity （KLh） and the thermal-vapor hydraulic conductivity （KvT） were thedominant hydraulic conductivities in the liquid and vapor phases. At the groundwater table depths of 10, 30 and 60 cm,the mean peak values of KLh were 2.32×10^-7, 1.63×10^-7 and 0.29×10^-7 m/s, respectively, whereas the mean peakvalues of KvT were 2.7×10^-7, 2.4×10^-7 and 1.8 ×10^-7m/s, respectively.

关键词： shallow groundwater matric potential thermal hydraulic conductivity isothermal hydraulic conductivity

Electrical and thermal conductivity of Earth's core and its thermal evolution——A review

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2022年第4期41卷 665-688页

作者： Yuan Yin Qingwen Zhang Youjun Zhang Shuangmeng zhai yun Liu State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang550081China International Research Center for Planetary Science College of Earth SciencesChengdu University of TechnologyChengdu610059China Institute of Atomic and Molecular Physics Sichuan UniversityChengdu610065China Key Laboratory of High-Temperature and High-Pressure Study of the Earth’s Interior Institute of GeochemistryChinese Academy of SciencesGuiyang550081China

The Earth’s core is composed of iron,nickel,and a small amount of light elements(e.g.,Si,S,O,C,N,H and P).The thermal conductivities of these components dominate the adiabatic heat flow in the core,which is highly correlated to *** we review a large number of studies on the electrical and thermal conductivity of iron and iron alloys and discuss their implications on the thermal evolution of the Earth’s *** summary,we suggest that the Wiedemann-Franz law,commonly used to convert the electrical resistivity to thermal conductivity for metals and alloys,should be cautiously applied under extremely high pressure-temperature(P-T)conditions(e.g.,Earth’s core)because the Lorentz number may be P-T *** date,the discrepancy in the thermal conductivity of iron and iron alloys remains between those from the resistivity measurements and the thermal diffusivity modeling,where the former is systematically *** studies reconcile the electrical resistivity by first-principles calculation and direct measurements,and this is a good start in resolving this *** to an overall higher thermal conductivity than previously thought,the inner core age is presently constrained at~1.0 ***,light elements in the core would likely lower the thermal conductivity and prolong the crystallization of the inner ***,whether thermal convection can power the dynamo before the inner core formation depends on the amounts of the proper light elements in the *** works are needed to establish the thermal evolution model of the core.

关键词： Earth’s core Electrical and thermal conductivity Iron and its alloys Thermal evolution Geodynamo

Unsupervised, Supervised and Semi-supervised Dimensionality Reduction by Low-Rank Regression Analysis

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2021年第4期30卷 603-610页

作者： TANG Kewei ZHANG Jun ZHANG Changsheng WANG Lijun zhai yun JIANG Wei School of Mathematics Liaoning Normal University College of Computer Science and Artificial Intelligence Wenzhou University Research Center for Information Science Theory and Methodology Institute of Scientific and Technical Information of China E-Government Research Center Chinese Academy of Governance

Techniques for dimensionality reduction have attracted much attention in computer vision and pattern recognition. However, for the supervised or unsupervised case, the methods combining regression analysis and spectral graph analysis do not consider the global structure of the subspace; For semi-supervised case,how to use the unlabeled samples more effectively is still an open problem. In this paper, we propose the methods by Low-rank regression analysis(LRRA) to deal with these problems. For supervised or unsupervised dimensionality reduction, combining spectral graph analysis and LRRA can make a global constraint on the subspace. For semi-supervised dimensionality reduction, the proposed method incorporating LRRA can exploit the unlabeled samples more effectively. The experimental results show the effectiveness of our methods.

关键词： Dimensionality reduction Low-rank Supervised Unsupervised Semi-supervised

Robust Semi-nonnegative Matrix Factorization with Adaptive Graph Regularization for Gene Representation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2020年第1期29卷 122-131页

作者： JIANG Wei MA Tingting FENG Xiaoting zhai yun TANG Kewei ZHANG Jie School of Mathematics Liaoning Normal University E-Government Research Center Chinese Academy of Governance

Various data representation algorithms have been proposed for gene expression. There are some shortcomings in traditional gene expression methods,such as learning the ideal affinity matrix to effectively capture the geometric structure of genetic data space,and reducing noises and outliers influences of data *** propose a novel matrix factorization algorithm called Robust semi-nonnegative matrix factorization(RSNMF)with adaptive graph regularization, which simultaneously performs matrix robust factorization with learning affinity matrix in a unified optimization framework. RSNMF also uses a loss function based on ?2,1-norm to improve the robustness of the model against noises and outliers.A novel Augmented Lagrange multiplier(ALM) is designed to obtain the optimal solution of RSNMF. The results of extensive experiments that were performed on gene expression datasets demonstrate that RSNMF outperforms the other algorithms, which validates the effectiveness and robustness of RSNMF.

关键词： Adaptive graph Matrix factorization Robustness

Apoptosis of carrot nuclei in in vitro system induced by cytochrome c

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1999年第16期44卷 1497-1502页

作者： yun Zhao Yingli Sun Zhengfan Jiang Zhonghe zhai Peking Univ Coll Life Sci Beijing 100871 Peoples R China

The apoptosis of carrot nuclei induced in cytosol of carrot cells by cytochrome c is reported. This kind of cell-free apoptosis system of plant, CS-100, is an efficient In vitro inducing system. Several typical characteristics of apoptosis including chromatin condensation, margina-tion and apoptotic bodies could be detected, and the degradation of genome in carrot nuclei

关键词： apoptosis cytochrome c cytosol cell-free system carrot nuclei.

Synthesis and cytotoxic activity of novel 2,6-disubstituted-4-morpholinothieno[3,2-d]pyrimidines as potent anti-tumor agents

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2012年第6期23卷 703-706页

作者： Wu Fu Zhu Xin zhai Sai Li yun yun Cao Ping Gong Ya Jing Liu Key Laboratary of Original New Drugs Design and Discovery of Ministry of Education School of Pharmaceutical Engineering Shenyang Pharmaceutical University Shenyang 110016 China

A series of 2,6-disubstituted-4-morpholinothieno[3,2-d]pyrimidine derivatives were synthesized and their cytotoxic activity against H460, HT-29, MDA-MB-231, U87MG and H1975 cancer cell lines were evaluated in vitro. Most of the target compounds exhibited moderate to excellent activity to the tested cell lines. The most promising compound 23 （0.84 μmol/L, 0.23 μmol/L, 2.52 μmogL, 1.80 μmol/L） was 1.0, 2.9, 29.3 and 4.3 times more active than GDC-0941 （0.87 μ mol/L, 0.66μmol/L, 73.8 μmol/L, 7.77 μmol/L） against H460, HT-29, MDA-MB-231 and U87MG cell lines, respectively.

关键词： 4-Morpholinothieno[3,2-d]pyrimidine Synthesis Cytotoxic activity