检索结果-南通市图书馆

Solitary Wave and Doubly Periodic Wave Solutions to Three-Dimensional Nizhnik-Novikov-Veselov Equation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第5期49卷 1241-1244页

作者： BAI Cheng-jie han ji-guang wang wei-tao AN hong-yong Communication School Shandong Normal University Jinan 250014 China Physical Science and Information Engineering School Liaocheng University Liaocheng 252059 China

The generalized transformation method is utilized to solve three-dimensional Nizhnik-Novikov-Veselov equation and construct a series of new exact solutions including kink-shaped and bell-shaped soliton solutions, trigonometric function solutions, and Jacobi elliptic doubly periodic solutions. Among them, the Jacobi elliptic periodic wave solutions exactly degenerate to the soliton solutions at a certain limit condition. Compared with the existing tanh methods and Jacobi function method, the method we used here gives more general exact solutions without much extra effort.

关键词： generalized transformation method (3+1)-dimensional Nizhnik-Novikov-Veselov equation exactsolution KdV equation mKdV equation cubic nonlinear Klein-Gordon equation

Altered 3D genome reorganization mediates precocious myeloid differentiation of aged hematopoietic stem cells in inflammation

在线全文

学校读者我要写书评

暂无评论

Science China Life Sciences 2025年

作者： Xinyu Cui Yu Dong Qiang Zhan Yixin Huang Qianshu Zhu Zihao Zhang guang Yang Liping wang Shijun Shen jia zhao Zhiyi Lin jiatong Sun Zhongqu Su Yihan Xiao Chuyu Zhang Yuwei Liang Lu Shen Lichen ji Xuguang Zhang jiqing Yin hong wang Zhiyang Chen Zhenyu Ju Cizhong jiang Rongrong Le Shaorong Gao Clinical and Translational Research Center of Shanghai First Maternity & Infant Hospital Frontier Science Center for Stem Cells School of Life Sciences and Technology Tongji University Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration of Ministry of Education Orthopaedic Department of Tongji Hospital School of Life Sciences and Technology Tongji University Key Laboratory of Regenerative Medicine of Ministry of Education Institute of Aging and Regenerative Medicine Department of Developmental & Regenerative Medicine College of Life Science and Technology Jinan University Shandong Key Laboratory of Animal Bioengineering and Disease Prevention College of Animal Science and Technology Shandong Agricultural University Department of Joint Surgery Shanghai East Hospital Tongji University School of Medicine Shanghai Institute of Nutrition and Health Chinese Academy of Sciences

Inflammation is a driving force of hematopoietic stem cells(HSCs) aging, causing irreversible exhaustion of functional HSCs. However, the underlying mechanism of HSCs erosion by inflammatory insult remains poorly understood. Here, we find that transient LPS exposure primes aged HSCs to undergo accelerated differentiation at the expense of self-renewal, leading to depletion of HSCs. Meanwhile, the central regulator nuclear factor kappa B(NF-κB) mediating functional impairment by inflammation insult induces differential transcriptional response in aged HSCs compared with young HSCs, with precocious activation of myeloid lineage genes. Altered compartmentalization and chromatin loop formation are associated with aging-related differential transcriptional response in HSCs upon lipopolysaccharide(LPS)stimulation. Mechanistically, enhancer and promoter regions of myeloid lineage genes in aged HSCs are more accessible and display more rapid and prominent CTCF occupancy upon LPS stimulation. Our study provides comprehensive resources for the three-dimensional(3D)genome structure of HSCs and sheds light into the ordered genome organization and the associated transcriptome signature underlying HSCs aging.

关键词：

The chemical constituents from Schisandra propinqua var. intermedia

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 Chemical Letters 2008年第12期19卷 1450-1452页

作者： hong Mei Li wei guang wang Xiao Nian Li yong zhao Rong tao Li han Dong Sun The College of Life Science and Technology Kunming University of Science and Technology Kunming 650224 China State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China

A new cinnamic acid monoterpenoid ester, intermedin C （1）, was isolated from the aerial parts of Schisandra propinqua var. interthedia. The structure of 1 was elucidated by spectroscopic methods including extensive ... 详细信息

关键词： Schisandra propinqua Monoterpenoid Intermedin C

Exact Solutions Expressible in Rational Formal Hyperbolic and Elliptic Functions for Nonlinear Differential-Difference Equation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第8期50卷 303-308页

作者： BAI Cheng-jie zhao hong han ji-guang School of Communication Shandong Normal University Jinan 250014 China School of Physical Science and Information Engineering Liaocheng University Liaocheng 252059 China

A new approach is presented by means of a new general ansitz and some relations among Jacobian elliptic functions, which enables one to construct more new exact solutions of nonlinear differential-difference equations. As an example, we apply this new method to Hybrid lattice, diseretized mKdV lattice, and modified Volterra lattice. As a result, many exact solutions expressible in rational formal hyperbolic and elliptic functions are conveniently obtained with the help of Maple.

关键词： nonlinear differential-difference equations new approach exact solutions

Confirming the 115.5-day periodicity in the X-ray light curve of ULX NGC 5408 X-1

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2012年第12期12卷 1597-1602页

作者： Xu han tao An Jun-Yi wang ji-Ming Lin Ming-jie Xie Hai-guang Xu Xiao-Yu hong Sandor Frey Key Laboratory of Cognitive Radio & Information Processing Ministry of Education Guilin University of Electronic Technology Guilin 541004 China Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China School of Mathematics and Computational Science Xiangtan University Xiangtan 411105China Key Laboratory of Radio Astronomy Chinese Academy of Sciences Nanjing 210008 China Department of Physics Shanghai Jiao Tong University Shanghai 200240 China FOMI Satellite Geodetic Observatory EO. Box 585 H-1592 Budapest Hungary

The Swift/XRT light curve of the ultraluminous X-ray source NGC 5408 X-1 was re-analyzed with two new numerical approaches, the weighted Wavelet Ztransform and CLEANest, and the results are different from previous studies. Both techniques detected a prominent periodicity with a time scale of 115.5 ± 1.5 days, in excellent agreement with the detection of the same periodicity first reported by Strohmayer . Monte Carlo simulations were employed to test the statisitical confidence of the 115.5-day periodicity, yielding a statistical significance of 〉 99.98% （or 〉 3.8σ）. The robust detection of the 115.5-day quasi-periodic oscillations, if they are due to the orbital motion of the binary, would infer a mass of a few thousand M⊙ for the central black hole, implying there is an intermediate-mass black hole in NGC 5408 X-1.

关键词： methods: statistical - galaxies: individual (NGC 5408) - stars: oscil- lations

Cycle performance studies on a new HFC-161/125/143a mixture as an alternative refrigerant to R404

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第2期13卷 132-139页

作者： Xiao-hong han Yu QIU Ying-jie XU Men-yuan zhao Qin wang guang-ming CHEN State Key Laboratory of Clean Energy Utilization Institute of Refrigeration and CryogenicsZhejiang UniversityHangzhou 310027China

In this paper, a new ternary non-azeotropic mixture of HFC-161/125/143a （0.15/0.45/0.40 in mass fraction）, as a promising mixed refrigerant to R404A, is presented. The ozone depletion potential （ODP） of the new refrigerant is zero and its basic thermodynamic properties are similar to those of R404A, but its global warming potential （GWP） is much smaller than those of R507A and R404A. Meanwhile, theoretical calculations show that, under the working condition 1 （the average evaporation temperature： -23℃, the average condensing temperature： 43℃, the superheat temperature： 28℃, the subcooling temperature： 5 ℃）, the volumetric refrigerating effect and specific refrigerating effect of the new mixture are 2.33% and 15.48% higher, re- spectively, than those of R404A. The coefficient of performance （COP） of the new mixture is 5.19% higher than that of R404A and the pressure ratio of the new mixture is 0.82% lower than that of R404A. Equally, under the working condition II （the average evaporation temperature： -40℃, the average condensing temperature： 35℃, the superheating temperature： 30 ~C, the subcooling temperature： 5℃）, the volumetric refrigerating effect and specific refrigerating effect of the new mixture are 2.24% and 20.58% higher, respectively, than those of R404A. The COP of the new mixture is 4.60% higher than that of R404A and the pressure ratio of the new mixture is similar to that of R404A. The performances of the new mixture and R404A are compared in a vapor compressor refrigeration apparatus originally designed for R404A under several working conditions （condensing temperatures： 35-45℃, evaporation temperatures： -40--20℃）. Experimental results show that the new mixture can obtain a higher COP, by 6.3% to 12.1%, and a lower pressure ratio, by 1.8% to 6.6%, compared to R404A; although the discharge temperature of the new mixture is slightly higher than that of R404A. The advantages of the new mixture will be further verified in the actual system.

关键词： Alternative refrigerant Mixture Cycle nerformance. R404A HFC-161

Multifocal neuroendocrine cell hyperplasia accompanied by tumorlet formation and pulmonary sclerosing pneumocytoma:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2020年第16期8卷 3583-3590页

作者： Xiao-Yu han Yuan-Yuan wang hong-Quan wei guang-zhao Yang jian wang Yu-Zhu jia wei-Qun Ao Department of Pathology Tongde Hospital of Zhejiang ProvinceHangzhou 310012Zhejiang ProvinceChina Department of Radiology Tongde Hospital of Zhejiang ProvinceHangzhou 310012Zhejiang ProvinceChina

BACKGROUND Pulmonary tumorlets are nodular hyperplastic neuroendocrine cells(NECs)that extend beyond the basement *** often coexist with other lung diseases such as fibrosis and bronchiectasis,but rarely accompanied by pulmonary sclerosing pneumocytoma(PSP),which has not been reported in the *** SUMMARY A 54-year-old woman was admitted to the hospital because she had symptoms of bloody sputum for more than 4 mo and hemoptysis for 1 *** tomography images showed atrophy accompanied by infections in the middle lobe of her right ***,numerous nodules were identified in the middle lobe of the right *** patient underwent thoracoscopic pneumonectomy of the middle lobe of the right lung,and the resected mass was pathologically confirmed to have bronchiectasis,multifocal NEC hyperplasia accompanied by tumorlet,and *** Our report presents a rare clinical case of bronchiectasis complicated with multifocal NEC hyperplasia,tumorlet,and PSP.

关键词： Neuroendocrine cell hyperplasia Tumorlet formation Pulmonary sclerosing pneumocytoma Pulmonary tumor

Performance analysis and optimization for chunked network coding based wireless cooperative downloading 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

Frontiers of Information Technology & Electronic Engineering 2017年第10期18卷 1601-1613页

作者： Xiu-xiu WEN Hui-qiang wang Jun-yu LIN guang-sheng FENG hong-wu LV ji-zhong han College of Computer Science and Technology Harbin Engineering University Institute of Information Engineering Chinese Academy of Sciences

Dense network coding(NC) is widely used in wireless cooperative downloading systems. Wireless devices have limited computing resources. Researchers have recently found that dense NC is not suitable because of its high coding complexity, and it is necessary to use chunked NC in wireless environments. However, chunked NC can cause more communications, and the amount of communications is affected by the chunk size. Therefore, setting a suitable chunk size to improve the overall performance of chunked NC is a prerequisite for applying it in wireless cooperative downloading systems. Most of the existing studies on chunked NC focus on centralized wireless broadcasting systems, which are different from wireless cooperative downloading systems with distributed features. Accordingly, we study the performance of chunked NC based wireless cooperative downloading systems. First, an analysis model is established using a Markov process taking the distributed features into consideration, and then the block collection completion time of encoded blocks for cooperative downloading is optimized based on the analysis model. Furthermore, queuing theory is used to model the decoding process of the chunked NC. Combining queuing theory with the analysis model, the decoding completion time for cooperative downloading is optimized, and the optimal chunk size is derived. Numerical simulation shows that the block collection completion time and the decode completion time can be largely reduced after optimization.

关键词： Wireless environments Cooperative downloading Chunked network coding Markov process

Identification of pollution sources in river based on particle swarm optimization

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2021年第6期33卷 1303-1315页

作者： guang-han Zhang Xiao-dong Liu Si Wu Zu-lin Hua Li zhao hong-qin Xue Peng wang Key Laboratory ofIntegrated Regulation and Resource Development on Shallow Lake ofMinistry of Education College of EnvironmentHohai UniversityNanjing 210098China School of Civil Engineering Nanjing Forestry UniversityNanjing 210037China Yangtze Institute for Conservation and Development Hohai UniversityNanjing 210098China jiangsu Environmental Industry CO. LTDNanjing 210037China

The pollution sources identification model is presented by the coupling of the river water quality model and particle swarm optimization(PSO)algorithm to estimate pollution sources from the measured/simulated contaminant concentration in the ***“twin experiment”is adopted to verify the feasibility of the identification model,and three cases are constructed to explore the results of the identification model in different *** experiment test demonstrated that the identification model is effective and efficient,while the model can accurately figure out the quantities of the pollutants and position of a single pollution source or multiple sources,with the relative error of the mean is less than 3%.Many factors are explored,including the level of random disturbance and the impact of particle population *** outcome showed that the disturbance level is less than 5%,thus the precision is preferable,and when the number of particles is three,the identification is the *** performing multiple sources,identification of multiple sets of monitoring sections respectively can obtain more accurate results with less *** this paper,the optimization method of the inverse problem is applied to the identification of river pollution sources,which can help us to identify pollution sources and provide us a scientific basis for subsequent water pollution control and prevention.

关键词： Identification model particle swarm optimization(PSO)optimization source identification surface water