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Physico-Chemical and Isotopic (18O, 2H and 3H) Characterization of the Upper Dallol Maouri Watershed (Niger): 《Open Journal of Geology》2022年第8期613-639,共27页Abdoul Hayou Habi Hamani Mahaman Moustapha Adamou Issoufou Sandao Halidou Alassane Hado; Dallol Maouri is one of the fossil valleys on the left bank of the Niger River. Its watershed drains water from valleys in the Tahoua and Dosso regions of Niger. The watercourse is not continuous and has areas of surf...; 关键词：Dallol Maouri Physicochemistry ISOTOPY PONDS Groundwater Continental Terminal

Characteristic Class of Isotopy for Surfaces: 《Journal of Systems Science & Complexity》2020年第6期2139-2156,共18页REN Yuxue WEN Chengfeng ZHEN Shengxian LEI Na LUO Feng GU David Xianfeng; the Science Challenge Project of China(TZZT2019-B1);the National Natural Science Foundation of China under Grant Nos.61720106005;61772105;61936002。; It is an important problem in topology to verify whether two embeddings are isotopic.This work proposes an algorithm for computing Haefliger-Wu invariants for isotopy based on algebraic topological methods.Given a sim...; 关键词：Characteristic class COHOMOLOGY EMBEDDING Haefliger-Wu invariants ISOTOPY

The topology of moment-angle manifolds——on a conjecture of S. Gitler and S. López de Medrano被引量：1: 《Science China Mathematics》2020年第10期2079-2088,共10页Liman Chen Feifei Fan Xiangjun Wang; supported by National Natural Science Foundation of China(Grant Nos.11571186,11701411,11801580 and 11871284)。; In this paper,we study the topology of moment-angle manifolds and prove a conjecture of S.Gitler and S.Lopez de Medrano concerned with the behavior of the moment-angle manifold under the surgery’cutting off a vertex...; 关键词：moment-angle manifolds simple polytope ISOTOPY regular embedding

Some Characterizations of a Normal Subgroup of a Group and Isotopic Classes of Transversals: 《Algebra Colloquium》2016年第3期409-422,共14页Vipul Kakkar R.P. Shukla; Let G be a group and H be a subgroup of G which is either finite or of finite index in G. In this paper, we give some characterizations for the normality of H in G. As a consequence we get a very short and elementary ...; 关键词：right loop normalized right transversal right inverse property ISOTOPY

Climate Change Impact on Aquifer System of Essaouira Basin during the Past 4 Decades (Morocco): 《Open Journal of Modern Hydrology》2016年第1期19-33,共15页Salah Ouhamdouch Mohammed Bahir Paula Carreira Najiba Chkir Abdelmalek Goumih Hamid Chamchati; Since the 50s, many changes are observed in the climate of the globe, the warming of the atmosphere and the ocean, the decrease in the extent of snow and ice, and rising sea levels. In addition to the demographic pres...; 关键词：Climate Change DROUGHT Essaouira Basin HYDROCHEMISTRY ISOTOPY Piezometry SEMI-ARID Water Resources

The Uniqueness of Skeleton Presentation of Complete Bipartite Graph K_(m,_n): 《Journal of Mathematical Research with Applications》2013年第5期616-624,共9页Lin XIAO Guangyan SHEN Bin LI; Supported by the National Natural Science Foundation of China(Grant No.11271063); Kobayashi discussed some kinds of standard embeddings into 3-manifolds of spatial graphs. He introduced the concept of book presentation, which is a standard embedding of spatial graphs with good properties, and prove...; 关键词：complete bipartite graph skeleton presentation FLOOR ambient isotopy.

Diffeomorphic types of complements of nice point arrangements in CP^l: 《Science China Mathematics》2009年第12期2774-2791,共18页YAU Stephen S.-T.; supported by National Natural Science Foundation of China(Grant No.10731030);Program of Shanghai Subject Chief Scientist (PSSCS) of Shanghai; We use a new method to study arrangement in CPl,define a class of nice point arrangements and show that if two nice point arrangements have the same combinatorics,then their complements are diffeomorphic to each other...; 关键词：diffeomorphic type hyperplane arrangement lattice isotopy 14F05 14H30

DIAGNOSIS AND TREATMENT OF INSIDIOUS RECURRENT SMALL INTESTINAL HEMORRHAGE被引量：2: 《Chinese Medical Sciences Journal》2000年第4期249-252,共4页何小东陶蔚郑朝纪张振寰; Objective. To improve the localized diagnosis of insidious recurrent small intestinal hemorrhage. Methods. This retrospective analysis include 64 cases of such diseases,which were admitted from 1988 to 1998 to our hos...; 关键词：small intestinal hemorrhage ISOTOPY ANGIOGRAPHY

Some Open Problems in Geometric Topologyof Low Dimensions: 《Chinese Quarterly Journal of Mathematics》1995年第4期8-14,共7页Alberto CAVICCHIOLI(Department Of Mathematics,University of Modena,Via Campi 213/B, 41100 Modena, Italy )Dusan REPOVS(Institute for Mathematics, Physics and Mechanics,University of Ljubljana,P. O. Box 64, Ljubljana 61111,Slovenia; ＳｏｍｅＯｐｅｎＰｒｏｂｌｅｍｓｉｎＧｅｏｍｅｔｒｉｃＴｏｐｏｌｏｇｙｏｆＬｏｗＤｉｍｅｎｓｉｏｎｓ￥ＡｌｂｅｒｔｏＣＡＶＩＣＣＨＩＯＬＩ（ＤｅｐａｒｔｍｅｎｔＯｆＭａｔｈｅｍａｔｉｃｓ，ＵｎｉｖｅｒｓｉｔｙｏｆＭｏ...; 关键词：approximation by embeddings ISOTOPY knot space SPINE s-cobordism homotopytype smooth manifolds: crystallization genus homotopy sphere open problems

ON ISOTOPY CLASSIFICATION OF EMBEDDINGS OF n-MANIFOLDS IN 2n-MANIFOLDS: 《Systems Science and Mathematical Sciences》1993年第1期61-69,共9页LI Banghe ZHANG Ping Institute of Systems Science, Academia Sinica, Beijing 100080, China; Let M be a compact n-manifold without boundary, U a 2n-manifold andf: M→U a map. Under the condition that f_*: π₁（M）→π（U） is surjective and thatker f_* contains no elements repre...; 关键词：EMBEDDING CLASSIFICATION

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