搜索结果: 1-15 共查到“理学 triangle”相关记录42条 . 查询时间(0.125 秒)
中国地质大学科学技术发展院靳晓野, 李建威等, 资源学院/GPMR国家重点实验室. Economic Geology, 2021, Calcite U-Pb dating unravels the age and hydrothermal history of the giant Shuiyindong Carlin-type gold deposit in the Golden Triangle, South China
放射性；同位素；实验室；卡林型；金矿床
2021/10/14
近日，矿床学领域权威期刊《Economic Geology》刊发我校资源学院和GPMR国家重点实验室李建威教授团队和昆士兰大学放射性同位素实验室合作的研究成果——首次利用LA-(MC)-ICPMS方解石U-Pb测年法精确确定了卡林型金矿床的形成时代。这是该团队继卡林型金矿成矿流体来源与演化示踪研究“Noble gases fingerprint the source and evolution o...
COMPARATIVE PHYLOGEOGRAPHY OF THREE CODISTRIBUTED STOMATOPODS: ORIGINS AND TIMING OF REGIONAL LINEAGE DIVERSIFICATION IN THE CORAL TRIANGLE
Allopatric speciation biodiversity center of origin
2015/12/17
The Indonesian-Australian Archipelago is the center of the world's marine biodiversity. Although many
biogeographers have suggested that this region is a "center of origin," criticism of this theory...
The generalized triangle inequalities in symmetric spaces and buildings with applications to algebra
generalized triangle inequalities symmetric spaces and buildings applications to algebra
2015/10/14
In this paper we apply our results on the geometry of polygons in infinitesimal symmetric spaces, symmetric spaces and buildings, [KLM1, KLM2], to four problems in algebraic group theory. Two of these...
Most quasi-Monte Carlo research focuses on sampling from the unit
cube. Many problems, especially in computer graphics, are de ned via
quadrature over the unit triangle. Quasi-Monte Carlo methods fo...
Risk Assessment and Ecotoxicology:Limitations and Recommendations for Ocean Disposal of Mine Waste in the Coral Triangle
Risk Assessment Ecotoxicology:Ocean Disposal Mine Waste Coral Triangle
2015/7/15
Mining is an important contribution to the economy of many developing tropical regions. Many sites of mining interest in the tropics have island geographies and potentially limited land area. While th...
Abstract: We show that the triangle with angles Pi/12, Pi/3 and 7*Pi/12 has the lattice property and compute this triangle's Veech group.
Scott's induced subdivision conjecture for maximal triangle-free graphs
Scott's subdivision conjecture maximal triangle-free graphs Combinatorics
2011/9/14
Abstract: Scott conjectured that the class of graphs with no induced subdivision of a given graph is $\chi$-bounded. We verify his conjecture for maximal triangle-free graphs.
Eigenstructure of the discrete Laplacian on the equilateral triangle: The Dirichlet & Neumann problems
equilateral triangle discrete Laplacian eigenvalues/eigenvectors
2010/11/1
Lam´e’s formulas for the eigenvalues and eigenfunctions of the continuous Laplacian on an equilateral triangle under Dirichlet and Neumann boundary conditions are herein extended to the discrete...
The incenter of a triangle as a cone isoperimetric center
Incenter isoperimetric problem optimization center
2011/3/1
We show that the the image of the regular projection of a vertex of a cone over a triangle
that minimizes the ratio of the cube of the area of the boundary of the cone and the square
of the volume o...
If G is a group with a presentation of the form hx, y|x3 = y3 = W(x, y)2 = 1i, then either G
is virtually soluble or G contains a free subgroup of rank 2. This provides additional evidence
in favour...
Detecting the topological charge of vortex beams using an annular triangle aperture
Vortex beam Topological charge Annular triangle aperture
2013/7/3
The Fraunhofer diffraction pattern of a vortex beam by an annular triangle aperture is analyzed theoretically and experimentally. It is found that the pattern of the far-field diffraction intensity di...
Probing the magnetic ground state of the molecular Dysprosium triangle
magnetic ground state molecular Dysprosium triangle
2010/11/18
We present zero eld muon spin lattice relaxation measurements of a Dysprosium triangle molecular magnet. The local magnetic elds sensed by the implanted muons indicate the coexistence of static and ...
AC square-wave, sawtooth-wave, and triangle-wave fields driven adiabatic quantum pumps in nanowire structures
AC square-wave sawtooth-wave triangle-wave fields driven adiabatic quantum pumps
2010/11/18
A dc current can be pumped through a nanostructure by two out-of-phase ac driving fields.
In this approach, we explore the pumped current properties driven by square-wave, sawtoothwave,
and triangle...
Efficient Triangle Counting in Large Graphs via Degree-based Vertex Partitioning
Efficient Triangle Counting Graphs Degree-based Vertex Partitioning
2010/11/17
The number of triangles is a computationally expensive graph statistic which is frequently used in complex network analysis (e.g., transitivity ratio), in various random graph models (e.g., exponenti...
The Fractional Chromatic Number of Triangle-free Graphs with $\Delta\leq 3$
Triangle-free Graphs Combinatorics
2010/11/18
Let $G$ be any triangle-free graph with maximum degree $\Delta\leq 3$. Staton proved that the independence number of $G$ is at least $\frac{5}{14}n$. Heckman and Thomas conjectured that Staton's resul...