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81.
Matthew Szczesny 《Letters in Mathematical Physics》2008,84(1):65-74
We examine the structure of the insertion–elimination Lie algebra on rooted trees introduced in Connes and Kreimer (Ann. Henri
Poincar 3(3):411–433, 2002). It possesses a triangular structure , like the Heisenberg, Virasoro, and affine algebras. We show in particular that it is simple, which in turn implies that
it has no finite-dimensional representations. We consider a category of lowest-weight representations, and show that irreducible
representations are uniquely determined by a “lowest weight” . We show that each irreducible representation is a quotient of a Verma-type object, which is generically irreducible.
相似文献
82.
83.
The carbon-13 chemical shift of seventeen N-substituted 2,4,6-triphenyl pyridinium salts (TPP) and N-substituted 2,4,6-triaryl pyridinium (TsPP) salts have been determined. 相似文献
84.
Equivariant quantization is a new theory that highlights the role of symmetries in the relationship between classical and quantum dynamical systems. These symmetries are also one of the reasons for the recent interest in quantization of singular spaces, orbifolds, stratified spaces, etc. In this work, we prove the existence of an equivariant quantization for orbifolds. Our construction combines an appropriate desingularization of any Riemannian orbifold by a foliated smooth manifold, with the foliated equivariant quantization that we built in Poncin et al. (2009) [19]. Further, we suggest definitions of the common geometric objects on orbifolds, which capture the nature of these spaces and guarantee, together with the properties of the mentioned foliated resolution, the needed correspondences between singular objects of the orbifold and the respective foliated objects of its desingularization. 相似文献
85.
In this paper we prove a relative index theorem for pairs of generalized Dirac operators on orbifolds which are the same at infinity. This generalizes to orbifolds a celebrated theorem of Gromov and Lawson. 相似文献
86.
Rupert L. Frank Ari Laptev Elliott H. Lieb Robert Seiringer 《Letters in Mathematical Physics》2006,77(3):309-316
Inequalities are derived for power sums of the real part and the modulus of the eigenvalues of a Schrödinger operator with a complex-valued potential. 相似文献
87.
D. Laux H. Blasco J.Y. Ferrandis G. Hugon G. Despaux A. Leydier D. Mornet 《Ultrasonics》2010,50(8):741-743
Duchenne muscular dystrophy (DMD) is caused by the absence of dystrophin, the protein that plays a key mechanical role in maintaining muscle membrane integrity. One of the major consequences of dystrophin deficiency is the degeneration of muscle fibres, with a progressive loss in muscle strength. The objective of this research was to find an ultrasonic parameter sensitive to DMD, which could give relevant information related to microstructure if compared to traditional investigations such as morphometrical analysis. This “in vitro” study focused on the Mdx mouse model and investigated the potential differences between wild-type and dystrophin-deficient mice diaphragms. Using a 50 MHz ultrasonic sensor built in our group, we recorded an increase in ultrasonic wave attenuation in the dystrophin-deficient samples in comparison with normal muscles. A correlation between attenuation, mouse age and the percentage of non-muscular proportion in muscle was observed. As Mdx mouse is the best animal model for DMD and reproduces the degenerative pattern observed in human DMD muscles, this approach could be a powerful tool for in vitro DMD investigation and, more generally, for the characterisation of muscle properties. 相似文献
88.
Heinz J. Rothe 《Annals of Physics》2008,323(6):1384-1396
We study the relation between the Lagrangian field-antifield formalism and the BRST invariant phase-space formulation of gauge theories. Starting from the Batalin-Fradkin-Vilkovisky unitarized action, we demonstrate in a deductive way the equivalence of the phase-space, and the Lagrangian field-antifield partition functions for the case of irreducible first rank theories. 相似文献
89.
90.
杭州市2014年城区大气污染物浓度变化特征观测分析 总被引:6,自引:3,他引:6
为了研究杭州市城区大气污染物的浓度变化特征,本文选取了2014年杭州市环境监测中心站空气质量自动监测站的大气污染物浓度数据,并结合地面气象要素资料进行分析,结果表明,在观测期间,杭州市城区大气中的PM2.5污染状况最严重,日平均浓度的超标率达30.7%;各污染物全年分布呈现明显的季节变化:O3浓度呈现与该季节气温和太阳辐射强度在全年中的排列相一致的夏、秋、春和冬季依次递减的分布,NO2则呈现冬高夏低,春秋介于两者之间的分布,SO2浓度从高到低依次为冬季>春季>秋季>夏季,CO、PM2.5和PM10浓度都呈现出冬高夏季、春秋季变化平缓的季节变化特征;各污染物浓度日变化呈现不同变化规律:O3和Ox浓度四季的日变化都呈单峰型分布,浓度峰值都出现在13:00~15:00,SO2也呈现单峰型分布,在09:00~10:00左右达到峰值,于次日04:00左右达到谷值,NO2、CO、PM2.5和PM10浓度的日变化特征类似,呈现双峰型变化,且峰值都与早晚高峰时间基本重合,冬季相对于其他季节首峰值时间推迟一小时左右;利用成对样本T检验进行比较,结果表明:NO2浓度在17:00~次日09:00工作日均明显高于周末,而在09:00~14:00工作日略低于周末,14:00~17:00浓度基本相等,O3浓度则在工作日的各时刻均高于周末;气象要素是大气污染物分布的重要影响因子,O3与气温和风速呈极显著正相关关系,与湿度呈极显著负相关关系,NO2与之相反,SO2、CO、PM2.5和PM10与风速呈现一致的显著负相关关系外,与其他气象要素在不同季节差异性较大,SO2和PM10与相对湿度呈现极显著负相关关系,CO和PM2.5与气温和湿度的相关性在不尽相同。 相似文献