发布求助
文献互助 智能选刊 最新文献

Acta Mathematicae Applicatae Sinica, English Series最新文献

筛选
英文 中文
D-optimal Designs for Multiresponse Linear Models with a Qualitative Factor Under General Covariance Structure 一般协方差结构下具有定性因子的多响应线性模型的D最优设计
IF 0.8 4区 数学
Acta Mathematicae Applicatae Sinica, English Series Pub Date : 2023-11-08 DOI: 10.1007/s10255-023-1089-9
Rong-Xian Yue, Xin Liu, Kashinath Chatterjee
{"title":"D-optimal Designs for Multiresponse Linear Models with a Qualitative Factor Under General Covariance Structure","authors":"Rong-Xian Yue,&nbsp;Xin Liu,&nbsp;Kashinath Chatterjee","doi":"10.1007/s10255-023-1089-9","DOIUrl":"10.1007/s10255-023-1089-9","url":null,"abstract":"<div><p>This paper considers a linear regression model involving both quantitative and qualitative factors and an <i>m</i>-dimensional response variable <b><i>y</i></b>. The main purpose of this paper is to investigate <i>D</i>-optimal designs when the levels of the qualitative factors interact with the levels of the quantitative factors. Under a general covariance structure of the response vector <b><i>y</i></b>, here we establish that the determinant of the information matrix of a product design can be separated into two parts corresponding to the two marginal designs. Moreover, it is also proved that <i>D</i>-optimal designs do not depend on the covariance structure if we assume hierarchically ordered system of regression models.</p></div>","PeriodicalId":6951,"journal":{"name":"Acta Mathematicae Applicatae Sinica, English Series","volume":"39 4","pages":"878 - 885"},"PeriodicalIF":0.8,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71909302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Formation of Singularity for Full Compressible Magnetohydrodynamic Equations with Zero Resistivity in Two Dimensional Bounded Domains 二维有界域中零电阻率全可压缩磁流体动力学方程奇异性的形成
IF 0.8 4区 数学
Acta Mathematicae Applicatae Sinica, English Series Pub Date : 2023-11-08 DOI: 10.1007/s10255-023-1094-z
Xin Zhong
{"title":"Formation of Singularity for Full Compressible Magnetohydrodynamic Equations with Zero Resistivity in Two Dimensional Bounded Domains","authors":"Xin Zhong","doi":"10.1007/s10255-023-1094-z","DOIUrl":"10.1007/s10255-023-1094-z","url":null,"abstract":"<div><p>We are concerned with singularity formation of strong solutions to the two-dimensional (2D) full compressible magnetohydrodynamic equations with zero resistivity in a bounded domain. By energy method and critical Sobolev inequalities of logarithmic type, we show that the strong solution exists globally if the temporal integral of the maximum norm of the deformation tensor is bounded. Our result is the same as Ponce’s criterion for 3D incompressible Euler equations. In particular, it is independent of the magnetic field and temperature. Additionally, the initial vacuum states are allowed.</p></div>","PeriodicalId":6951,"journal":{"name":"Acta Mathematicae Applicatae Sinica, English Series","volume":"39 4","pages":"990 - 1008"},"PeriodicalIF":0.8,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71909304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Large Time Behavior of Solutions to a 3D Keller-Segel-Stokes System Involving a Tensor-valued Sensitivity with Saturation 具有饱和张量值灵敏度的三维Keller-Segel-Stocks系统解的大时间行为
IF 0.8 4区 数学
Acta Mathematicae Applicatae Sinica, English Series Pub Date : 2023-11-08 DOI: 10.1007/s10255-023-1092-1
Yuan-yuan Ke, Jia-Shan Zheng
{"title":"Large Time Behavior of Solutions to a 3D Keller-Segel-Stokes System Involving a Tensor-valued Sensitivity with Saturation","authors":"Yuan-yuan Ke,&nbsp;Jia-Shan Zheng","doi":"10.1007/s10255-023-1092-1","DOIUrl":"10.1007/s10255-023-1092-1","url":null,"abstract":"<div><p>In this paper we deal with the initial-boundary value problem for the coupled Keller-Segel-Stokes system with rotational flux, which is corresponding to the case that the chemical is produced instead of consumed, </p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div><p> subject to the boundary conditions (∇<i>n</i> − <i>nS</i>(<i>x, n, c</i>)∇<i>c</i>) · <i>ν</i> = ∇<i>c</i> · <i>ν</i> = 0 and <i>u</i> = 0, and suitably regular initial data (<i>n</i><sub>0</sub>(<i>x</i>), <i>c</i><sub>0</sub>(<i>x</i>), <i>u</i><sub>0</sub>(<i>x</i>)), where Ω ⊂ ℝ<sup>3</sup> is a bounded domain with smooth boundary <i>∂</i>Ω. Here <i>S</i> is a chemotactic sensitivity satisfying ∣<i>S</i>(<i>x, n, c</i>)∣ ≤ <i>C</i><sub><i>S</i></sub>(1 + <i>n</i>)<sup>−<i>α</i></sup> with some <i>C</i><sub><i>S</i></sub> &gt; 0 and <i>α</i> &gt; 0. The greatest contribution of this paper is to consider the large time behavior of solutions for the system (KSS), which is still open even in the 2D case. We can prove that the corresponding solution of the system (KSS) decays to (<span>({1 over {|Omega |}}int_Omega {{n_0}} )</span>, <span>({1 over {|Omega |}}int_Omega {{n_0}} )</span>, 0) exponentially, if the coefficient of chemotactic sensitivity is appropriately small. As a precondition to consider the asymptotic behavior, we also show the global existence and boundedness of the corresponding initial-boundary problem KSS with a simplified method. We find a new phenomenon that the suitably small coefficient <i>C</i><sub><i>S</i></sub> of chemotactic sensitivity could benefit the global existence and boundedness of solutions to the model KSS.</p></div>","PeriodicalId":6951,"journal":{"name":"Acta Mathematicae Applicatae Sinica, English Series","volume":"39 4","pages":"1032 - 1064"},"PeriodicalIF":0.8,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71909223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On Real-rootedness of Independence Polynomials of Rooted Products of Graphs 关于图的根积的独立多项式的实根性
IF 0.8 4区 数学
Acta Mathematicae Applicatae Sinica, English Series Pub Date : 2023-11-08 DOI: 10.1007/s10255-023-1088-x
Aria Ming-yue Zhu, Bao-xuan Zhu
{"title":"On Real-rootedness of Independence Polynomials of Rooted Products of Graphs","authors":"Aria Ming-yue Zhu,&nbsp;Bao-xuan Zhu","doi":"10.1007/s10255-023-1088-x","DOIUrl":"10.1007/s10255-023-1088-x","url":null,"abstract":"<div><p>An <i>independent set</i> in a graph <i>G</i> is a set of pairwise non-adjacent vertices. The <i>independence polynomial</i> of <i>G</i> is the polynomial <span>(sumlimits_A {{x^{|A|}}} )</span>, where the sum is over all independent sets <i>A</i> of <i>G</i>. In 1987, Alavi, Malde, Schwenk and Erdős conjectured that the independence polynomial of any tree or forest is unimodal. Although this unimodality conjecture has attracted many researchers’ attention, it is still open. Recently, Basit and Galvin even asked a much stronger question whether the independence polynomial of every tree is ordered log-concave. Note that if a polynomial has only negative real zeros then it is ordered log-concave and unimodal. In this paper, we observe real-rootedness of independence polynomials of rooted products of graphs. We find some trees whose rooted product preserves real-rootedness of independence polynomials. In consequence, starting from any graph whose independence polynomial has only real zeros, we can obtain an infinite family of graphs whose independence polynomials have only real zeros. In particular, applying it to trees or forests, we obtain that their independence polynomials are unimodal and ordered log-concave.</p></div>","PeriodicalId":6951,"journal":{"name":"Acta Mathematicae Applicatae Sinica, English Series","volume":"39 4","pages":"854 - 867"},"PeriodicalIF":0.8,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71909225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Non-existence of Multi-peak Solutions to the Schrödinger-Newton System with L2-constraint 具有L2约束的Schrödinger-Newton系统多峰解的不存在性
IF 0.8 4区 数学
Acta Mathematicae Applicatae Sinica, English Series Pub Date : 2023-11-08 DOI: 10.1007/s10255-023-1086-z
Qing Guo, Li-xiu Duan
{"title":"Non-existence of Multi-peak Solutions to the Schrödinger-Newton System with L2-constraint","authors":"Qing Guo,&nbsp;Li-xiu Duan","doi":"10.1007/s10255-023-1086-z","DOIUrl":"10.1007/s10255-023-1086-z","url":null,"abstract":"<div><p>In this paper, we are concerned with the the Schrödinger-Newton system with <i>L</i><sup>2</sup>-constraint. Precisely, we prove that there cannot exist multi-peak normalized solutions concentrating at <i>k</i> different critical points of <i>V</i>(<i>x</i>) under certain assumptions on asymptotic behavior of <i>V</i>(<i>x</i>) and its first derivatives near these points. Especially, the critical points of <i>V</i>(<i>x</i>) in this paper must be degenerate.</p><p>The main tools are a local Pohozaev type of identity and the blow-up analysis. Our results also show that the asymptotic behavior of concentrated points to Schrödinger-Newton problem is quite different from the classical Schrödinger equations, which is mainly caused by the nonlocal term.</p></div>","PeriodicalId":6951,"journal":{"name":"Acta Mathematicae Applicatae Sinica, English Series","volume":"39 4","pages":"868 - 877"},"PeriodicalIF":0.8,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71909296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamic Analysis of the Multi-state Reliability System with Priority Repair Discipline 具有优先修复纪律的多状态可靠性系统动态分析
IF 0.9 4区 数学
Acta Mathematicae Applicatae Sinica, English Series Pub Date : 2023-07-19 DOI: 10.1007/s10255-023-1079-y
Aihemaitijiang Yumaier, Ehmet Kasim
{"title":"Dynamic Analysis of the Multi-state Reliability System with Priority Repair Discipline","authors":"Aihemaitijiang Yumaier,&nbsp;Ehmet Kasim","doi":"10.1007/s10255-023-1079-y","DOIUrl":"10.1007/s10255-023-1079-y","url":null,"abstract":"<div><p>This paper considers a multi-state repairable system that is composed of two classes of components, one of which has a priority for repair. First, we investigate the well-posedenss of the system by applying the operator semigroup theory. Then, using Greiner’s idea and the spectral properties of the corresponding operator, we obtain that the time-dependent solution of the system converges strongly to its steady-state solution.</p></div>","PeriodicalId":6951,"journal":{"name":"Acta Mathematicae Applicatae Sinica, English Series","volume":"40 3","pages":"665 - 694"},"PeriodicalIF":0.9,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86084725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sharp Bounds on the Aα-index of Graphs in Terms of the Independence Number 图的Aα-指数的独立数的锐界
IF 0.8 4区 数学
Acta Mathematicae Applicatae Sinica, English Series Pub Date : 2023-06-17 DOI: 10.1007/s10255-023-1049-4
Wan-ting Sun, Li-xia Yan, Shu-chao Li, Xue-chao Li
{"title":"Sharp Bounds on the Aα-index of Graphs in Terms of the Independence Number","authors":"Wan-ting Sun,&nbsp;Li-xia Yan,&nbsp;Shu-chao Li,&nbsp;Xue-chao Li","doi":"10.1007/s10255-023-1049-4","DOIUrl":"10.1007/s10255-023-1049-4","url":null,"abstract":"<div><p>Given a graph <i>G</i>, the adjacency matrix and degree diagonal matrix of <i>G</i> are denoted by <i>A</i>(<i>G</i>) and <i>D</i>(<i>G</i>), respectively. In 2017, Nikiforov<sup>[24]</sup> proposed the <i>A</i><sub><i>α</i></sub>-matrix: <i>A</i><sub><i>α</i></sub>(<i>G</i>) = <i>αD</i>(<i>G</i>) + (1 − <i>α</i>)<i>A</i>(<i>G</i>), where <i>α</i> ∈ [0, 1]. The largest eigenvalue of this novel matrix is called the <i>A</i><sub><i>α</i></sub>-index of <i>G</i>. In this paper, we characterize the graphs with minimum <i>A</i><sub><i>α</i></sub>-index among <i>n</i>-vertex graphs with independence number <i>i</i> for <i>α</i> ∈ [0, 1), where <span>(i = 1,,,leftlfloor {{n over 2}} rightrfloor,leftlceil {{n over 2}} rightrceil,,leftlfloor {{n over 2}} rightrfloor + 1,n - 3,n - 2,n - 1)</span>, whereas for <i>i</i> = 2 we consider the same problem for <span>(alpha in [0,{3 over 4}])</span>. Furthermore, we determine the unique graph (resp. tree) on <i>n</i> vertices with given independence number having the maximum <i>A</i><sub><i>α</i></sub>-index with <i>α</i> ∈ [0, 1), whereas for the <i>n</i>-vertex bipartite graphs with given independence number, we characterize the unique graph having the maximum <i>A</i><sub><i>α</i></sub>-index with <span>(alpha in [{1 over 2},1))</span>.</p></div>","PeriodicalId":6951,"journal":{"name":"Acta Mathematicae Applicatae Sinica, English Series","volume":"39 3","pages":"656 - 674"},"PeriodicalIF":0.8,"publicationDate":"2023-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50490324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Local Dependence Test Between Random Vectors Based on the Robust Conditional Spearman’s ρ and Kendall’s τ 基于鲁棒条件Spearmanρ和Kendallτ的随机向量间的局部相关性检验
IF 0.8 4区 数学
Acta Mathematicae Applicatae Sinica, English Series Pub Date : 2023-06-17 DOI: 10.1007/s10255-023-1073-4
Ling-yue Zhang, Heng-jian Cui
{"title":"Local Dependence Test Between Random Vectors Based on the Robust Conditional Spearman’s ρ and Kendall’s τ","authors":"Ling-yue Zhang,&nbsp;Heng-jian Cui","doi":"10.1007/s10255-023-1073-4","DOIUrl":"10.1007/s10255-023-1073-4","url":null,"abstract":"<div><p>This paper introduces two local conditional dependence matrices based on Spearman’s <i>ρ</i> and Kendall’s <i>τ</i> given the condition that the underlying random variables belong to the intervals determined by their quantiles. The robustness is studied by means of the influence functions of conditional Spearman’s <i>ρ</i> and Kendall’s <i>τ</i>. Using the two matrices, we construct the corresponding test statistics of local conditional dependence and derive their limit behavior including consistency, null and alternative asymptotic distributions. Simulation studies illustrate a superior power performance of the proposed Kendall-based test. Real data analysis with proposed methods provides a precise description and explanation of some financial phenomena in terms of mathematical statistics.</p></div>","PeriodicalId":6951,"journal":{"name":"Acta Mathematicae Applicatae Sinica, English Series","volume":"39 3","pages":"491 - 510"},"PeriodicalIF":0.8,"publicationDate":"2023-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50489723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Characterizations of the BMO and Lipschitz Spaces via Commutators on Weak Lebesgue and Morrey Spaces 弱Lebesgue和Morrey空间上BMO和Lipschitz空间的交换子刻画
IF 0.8 4区 数学
Acta Mathematicae Applicatae Sinica, English Series Pub Date : 2023-06-17 DOI: 10.1007/s10255-023-1077-0
Ding-huai Wang, Jiang Zhou
{"title":"Characterizations of the BMO and Lipschitz Spaces via Commutators on Weak Lebesgue and Morrey Spaces","authors":"Ding-huai Wang,&nbsp;Jiang Zhou","doi":"10.1007/s10255-023-1077-0","DOIUrl":"10.1007/s10255-023-1077-0","url":null,"abstract":"<div><p>We prove that the weak Morrey space <i>WM</i><span>\u0000 <sup><i>p</i></sup><sub><i>q</i></sub>\u0000 \u0000 </span> is contained in the Morrey space <span>(M_{{q_1}}^p)</span> for 1 ≤ <i>q</i><sub>1</sub> &lt; <i>q</i> ≤ <i>p</i> &lt; ∞. As applications, we show that if the commutator [<i>b, T</i>] is bounded from <i>L</i><sup><i>p</i></sup> to <i>L</i><sup><i>p</i>,∞</sup> for some <i>p</i> ∈ (1, ∞), then <i>b</i> ∈ BMO, where <i>T</i> is a Calderón-Zygmund operator. Also, for 1 &lt; <i>p</i> ≤ <i>q</i> &lt; ∞, <i>b</i> ∈ BMO if and only if [6, <i>T</i>] is bounded from <i>M</i><span>\u0000 <sup><i>p</i></sup><sub><i>q</i></sub>\u0000 \u0000 </span> to <i>WM</i><span>\u0000 <sup><i>p</i></sup><sub><i>q</i></sub>\u0000 \u0000 </span>. For <i>b</i> belonging to Lipschitz class, we obtain similar results.</p></div>","PeriodicalId":6951,"journal":{"name":"Acta Mathematicae Applicatae Sinica, English Series","volume":"39 3","pages":"583 - 590"},"PeriodicalIF":0.8,"publicationDate":"2023-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50489727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
On the Turán Density of Uniform Hypergraphs 关于一致超图的Turán密度
IF 0.8 4区 数学
Acta Mathematicae Applicatae Sinica, English Series Pub Date : 2023-06-17 DOI: 10.1007/s10255-023-1067-2
An Chang, Guo-rong Gao
{"title":"On the Turán Density of Uniform Hypergraphs","authors":"An Chang,&nbsp;Guo-rong Gao","doi":"10.1007/s10255-023-1067-2","DOIUrl":"10.1007/s10255-023-1067-2","url":null,"abstract":"<div><p>Let <i>p, q</i> be two positive integers. The 3-graph <i>F</i>(<i>p, q</i>) is obtained from the complete 3-graph <i>K</i><span>\u0000 <sup>3</sup><sub><i>p</i></sub>\u0000 \u0000 </span> by adding <i>q</i> new vertices and <span>(p(_2^q))</span> new edges of the form <i>vxy</i> for which <i>v</i> ∈ <i>V</i>(<i>K</i><span>\u0000 <sup>3</sup><sub><i>p</i></sub>\u0000 \u0000 </span>) and {<i>x, y</i>} are new vertices. It frequently appears in many literatures on the Turán number or Turán density of hypergraphs. In this paper, we first construct a new class of <i>r</i>-graphs which can be regarded as a generalization of the 3-graph <i>F</i>(<i>p, q</i>), and prove that these <i>r</i>-graphs have the same Turán density under some situations. Moreover, we investigate the Turán density of the <i>F</i>(<i>p, q</i>) for small <i>p, q</i> and obtain some new bounds on their Turán densities.</p></div>","PeriodicalId":6951,"journal":{"name":"Acta Mathematicae Applicatae Sinica, English Series","volume":"39 3","pages":"638 - 646"},"PeriodicalIF":0.8,"publicationDate":"2023-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50490322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
首页 上一页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信