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On Rees algebras and invariants for singularities over perfect fields
Rees algebras Integral closure Singularities Commutative Algebra
2011/8/31
Abstract: This purpose of this paper is to show how Rees algebras can be applied in the study of singularities embedded in smooth schemes over perfect fields. In particular, we will study situations i...
Parameter estimation biases due to contributions from the Rees-Sciama effect to the integrated Sachs-Wolfe spectrum
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/24
The subject of this paper is an investigation of the nonlinear contributions to the spectrum of the integrated Sachs-Wolfe (iSW) effect. We derive the corrections to the iSW-auto spectrum and the iSW-...
The Rees product of posets
Rees product posets
2010/12/10
We determine how the flag f-vector of any graded poset changes under the Rees product with the
chain, and more generally, any t-ary tree. As a corollary, the M¨obius function of the Rees product of a...
Determination of Rare Earth Elements (REEs) in Airborne Particulate Matter (APM) Collected in Tokyo, Japan, and a Positive Anomaly of Europium and Terbium
-Rare Earth Elements Airborne Particulate Matter Tokyo
2010/9/17
The determination of rare earth elements (REEs) in airborne particulate matter (APM) was conducted, and the distribution pattern of atmospheric REEs was evaluated in this study. The APM was collected ...
δEuN-ΣREEs图解定量区分长江和黄河沉积物
物源 长江 黄河 δEuN-ΣREEs图解
2009/5/20
对取自长江下游河道和黄河的沉积物样品进行了稀土元素分析, 并搜集了文献资料中长江和黄河沉积物样品的稀土元素数据, 发现在δEuN-ΣREEs关系图中长江和黄河沉积物之间有一条明显的分界线, 回归分析表明该分界线是一个3次多项式方程, 在该界线的上方是长江沉积物, 下方是黄河沉积物. 为了考察该分界线的合理性及其应用价值, 在长江口和黄河口分别取样进行稀土元素分析, 并搜集了来源于长江255孔和源于...
东太平洋沉积物中粘土组分的REEs和εNd：粘土来源的证据
东太平洋 粘土组分 REEs
2009/3/31
对东太平洋中国多金属结核调查区表层非钙质沉积物中的粘土组分进行了粘土矿物、稀土元素(REEs)及钕(Nd)同位素测定. 结果表明, M/I(蒙脱石/伊利石比值)、ΣREE(稀土总量)、LREE/HREE (轻重稀土比值)及δ Ce(铈异常值)能够有效指示粘土矿物的成因.
We study varieties of semigroups related to completely 0-simple semigroup. We present here an algorithmic descriptions of these varieties in terms of ”forbidden” semigroups.We also describe residually...
Florencite-(La) with fissiogenic REEs from a natural fission reactor at Bangombé, Gabon
Florencite-(La) fissiogenic REEs fission reactor Bangombé Gabon
2012/4/6
Florencite-(La) (La/Ce = 1.09) withfissiogenic REEsand florencite-(Ce) (La/Ce =0.62) have been identified in illite from the clay mantlesurrounding a natural, 2Gafission reactor atBangombeand in sands...