检索结果-南通市图书馆

A route to understanding the variability in permafrost distribution under climate change

在线全文

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2023年第2期14卷 164-165页

作者： alexander n.FEDOROV Melnikov Permafrost Institute Yakutsk 677010Russian Federation

Researchers are concerned about the present state of permafrost,which occupies about 25%of the Earth's *** degradation disturbs the landscape and increases greenhouse gas emissions,creating serious problems for human settlements,infrastructure,new land creation and mineral resource *** in previously stable permafrost systems impact surface hydrology,transform ecosystems,and change the way people live in permafrost。

关键词： landscape greenhouse Earth

Finite groups with systems of Σ-embedded subgroups

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 China Mathematics 2011年第9期54卷 1909-1926页

作者： GUO WenBin SKIBA alexander n Department of Mathematics University of Science and Technology of China Hefei 230026 China Department of Mathematics Francisk Skorina Gomel State University Gomel 246019 Belarus

In recent years,a series of papers about cover-avoiding property of subgroups appeared and all the studies were connected with chief factors of a finite ***,about the cover-avoiding property of subgroups for non-chief factor,there is no study up to *** purpose of this paper is to build the *** A be a subgroup of a finite group G and Σ:G0≤G1≤…≤Gn some subgroup series of *** that for each pair(K,H) such that K is a maximal subgroup of H and G i 1 K n *** this paper,we study the finite groups with given systems of Σ-embedded *** basic properties of Σ-embedded subgroups are established and some new characterizations of some classes of finite groups are given and some known results are generalized.

关键词： finite group ∑-embedded subgroups ∑p-embedded subgroup soluble group supersoluble group p-nilpotent group saturated formation

On σ-semipermutable Subgroups of Finite Groups

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2018年第9期34卷 1379-1390页

作者： Wen Bin GUO alexander n. SKIBA Department of Mathematics University of Science and Technology of China Hefei 230026 P. R. China Department of Mathematics and Technologies of Programming Francisk Skorina Gomel State University Gomel 246019 Belarus

Let a = {σi｜ i ∈ I} be some partition of the set of all primes P, G a finite group and σ（G） = {σi｜σi ∩ π （G） ≠ Ф}. A set H of subgroups of G is said to be a complete Hall or-set of G if every member ≠ 1 of H is a Hall σi-subgroup of G for some σi ∈ σ and H contains exactly one Hall σi-subgroup of G for every σi ∈ σ（G）. A subgroup H of G is said to be： σ-semipermutablc in G with respect to H if HHi x = Hi x H for all x ∈ G and all x ∈ G and all Hi ∈H such that （｜H｜, ｜Hi｜） = 1; σ-semipermutable in G if H is σ-semipermutable in G with respect to some complete Hall σ-set of G. We study the structure of G being based on the assumption that some subgroups of G are σ-semipermutable in G.

关键词： Finite group Hall subgroup p-soluble group p-supersoluble group σ-semipermutable subgroup

A generalized CAP-subgroup of a finite group

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2015年第10期58卷 2133-2144页

作者： GUO WenBin SKIBA alexander n. YAnG nanYing School of Mathematical Sciences University of Science and Technology of China Department of Mathematics Francisk Skorina Gomel State University School of Science Jiangnan University

Let A be a subgroup of a finite group G. We say that A is a generalized CAP-subgroup of G if for each chief factor H/K of G either A avoids H/K or the following holds:(1) If H/K is non-abelian, then|H :(A ∩H)K | is a p′-number for every p ∈π((A ∩H)K/K);(2) If H/K is a p-group, then |G : nG(K(A ∩H))| is a p-number. In this paper, we use the generalized CAP-subgroup to characterize the structure of finite *** new characterizations of the hypercyclically embedded subgroups of a finite group are obtained and a series of known results are generalized.

关键词： finite group generalized CAP-subgroup U-embedded subgroup solubly saturated formation p-nilpotent group supersoluble subgroup

On solubility and supersolubility of some classes of finite groups

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2009年第2期52卷 272-286页

作者： SHUM Kar Ping SKIBA alexander n. Department of Mathematics University of Hong Kong Department of Mathematics Francisk Skorina Gomel State University

AbstractLet G be a finite group and H a subgroup of G. Then H is said to be S-permutable in G if HP = PH for all Sylow subgroups P of G. Let H sG be the subgroup of H generated by all those subgroups of H which are S-permutable in G. Then we say that H is S-embedded in G if G has a normal subgroup T and an S-permutable subgroup C such that T ∩ H ? H sG and HT = C.Our main result is the followingTheorem AA group G is supersoluble if and only if for every non-cyclic Sylow subgroup P of the generalized Fitting subgroup F*(G) of G, at least one of the following holds: Every maximal subgroup of P is S-embedded in G.Every cyclic subgroup H of P with prime order or order 4 (if P is a non-abelian 2-group and H ? Z ∞ (G)) is S-embedded in G.

关键词： S-permutable subgroups S-embedded subgroups saturated formations generalized Fitting subgroups supersoluble groups 20D10 20D20 20D25

Emerging use of artificial intelligence in inflammatory bowel disease

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2020年第44期26卷 6923-6928页

作者： Arushi Kohli Erik A Holzwanger alexander n Levy Department of Internal Medicine Tufts Medical CenterBostonMA 02111United States Division of Gastroenterology and Hepatology Tufts Medical CenterBostonMA 02111United States

Inflammatory bowel disease(IBD)is a complex,immune-mediated gastrointestinal disorder with ill-defined etiology,multifaceted diagnostic criteria,and unpredictable treatment *** in IBD diagnostics,including developments in genomic sequencing and molecular analytics,have generated tremendous interest in leveraging these large data platforms into clinically meaningful *** intelligence,through machine learning facilitates the interpretation of large arrays of data,and may provide insight to improving IBD *** potential applications of machine learning models are vast,further research is needed to generate standardized models that can be adapted to target IBD populations.

关键词： Artificial intelligence Machine learning Automated diagnostics Colorectal neoplasia screening Multiomic data Predictive models

Surgical management of necrotizing pancreatitis:An overview

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第43期20卷 16106-16112页

作者： George Kokosis alexander Perez Theodore n Pappas Department of Surgery Duke University Medical CenterDurhamNC 27705United States

necrotizing pancreatitis is an uncommon yet serious complication of acute pancreatitis with mortality rates reported up to 15%that reach 30%in case of *** open surgical debridement was the only tool in our disposal to manage this serious clinical *** approach is however associated with poor *** has now shifted away from open surgical debridement to a more conservative management and minimally invasive *** approach to patients with necrotizing pancreatitis and/or infectious pancreatitis is summarized in the 3Ds:Delay,Drain and *** can be managed in the intensive care unit and any intervention should be *** drainage can be utilized first and early in the course of the disease,followed by endoscopic drainage or video assisted retroperitoneoscopic drainage if necrosectomy is deemed *** surgery is now less frequently performed and should be reserved for cases refractory to any other *** management of necrotizing pancreatitis therefore requires a multidisciplinary dynamic model of approach rather than being a surgical disease.

关键词： necrotizing pancreatitis Severe acute pancreatitis Debridement necrosectomy Infected necrosis Endoscopic necrosectomy Video-assisted retroperitoneal debridement Percutaneous catheter drainage

Dielectric tunability of magnetic properties in orthorhombic ferromagnetic monolayer CrSBr

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2023年第1期9卷 1514-1523页

作者： alexander n.Rudenko Malte Rösner Mikhail I.Katsnelson Radboud University Institute for Molecules and MaterialsHeijendaalseweg 1356525AJ NijmegenThe Netherlands

Monolayer CrSBr is a recently discovered semiconducting spin-3/2 ferromagnet with a Curie temperature of around 146 *** contrast to many other known 2D magnets,the orthorhombic lattice of CrSBr gives rise to spatial anisotropy of magnetic excitations within the 2D *** magnetic anisotropy and considerable magnetic dipolar interactions in CrSBr challenge its theoretical description in terms of spin ***,we employ a Green’s function formalism combined with first-principles calculations to study the magnetic properties of monolayer CrSBr in different regimes of surrounding dielectric *** the free-standing limit,the system is close to an easy-plane magnet,whose long-range ordering is partially *** the contrary,in the regime of large external screening,monolayer CrSBr behaves like an easy-axis ferromagnet with more stable magnetic *** findings suggest that anisotropic layered magnets form a potentially promising platform for studying the effects of substrate screening on magnetic ordering in 2D.

关键词： monolayer orthorhombic anisotropy

On Some Results in the Theory of Finite Partially Soluble Groups

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Mathematics and Statistics 2016年第3期4卷 281-309页

作者： alexander n.Skiba Department of Mathematics Francisk Skorina Gomel State University246019 GomelBelarus

This article provides an overview of some recent results and ideas relatedto the study of finite groups depending on the restrictions on some systems of *** particular,we discuss some properties of the lattice of all subgroups ofa finite group related with conditions of permutability and generalized subnormality for *** paper contains more than 30 open problems which were posed,atdifferent times,by some mathematicians working in the discussed direction.

关键词： Finite group.Subgroup lattice.G-covering subgroup system.I1-subnormal subgroup o-nilpotent group