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排序方式: 共有146条查询结果,搜索用时 15 毫秒
41.
Dr. Kathrin Junge Veronica Papa Prof. Dr. Matthias Beller 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(1):122-143
Non-noble metal catalysts based on pincer type compounds are of special interest for organometallic chemistry and organic synthesis. Next to iron and manganese, currently cobalt–pincer type complexes are successfully applied in various catalytic reactions. In this review the recent progress in (de)hydrogenation, transfer hydrogenation, hydroboration and hydrosilylation as well as dehydrogenative coupling reactions using cobalt–pincer complexes is summarised. 相似文献
42.
Let be a prime power and be a positive integer. A subspace partition of , the vector space of dimension over , is a collection of subspaces of such that each nonzero vector of is contained in exactly one subspace in ; the multiset of dimensions of subspaces in is then called a Gaussian partition of . We say that contains a direct sum if there exist subspaces such that . In this paper, we study the problem of classifying the subspace partitions that contain a direct sum. In particular, given integers and with , our main theorem shows that if is a subspace partition of with subspaces of dimension for , then contains a direct sum when has a solution for some integers and belongs to the union of two natural intervals. The lower bound of captures all subspace partitions with dimensions in that are currently known to exist. Moreover, we show the existence of infinite classes of subspace partitions without a direct sum when or when the condition on the existence of a nonnegative integral solution is not satisfied. We further conjecture that this theorem can be extended to any number of distinct dimensions, where the number of subspaces in each dimension has appropriate bounds. These results offer further evidence of the natural combinatorial relationship between Gaussian and integer partitions (when ) as well as subspace and set partitions. 相似文献
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The forward electroproduction of two light vector mesons is the first example of a collision process between strongly interacting
colorless particles for which the amplitude can be written completely within perturbative QCD in the Regge limit with next-to-leading
accuracy. In a previous paper we have given a numerical determination of the amplitude in the case of equal photon virtualities
by using a definite representation for the amplitude and a definite optimization method for the perturbative series. Here
we estimate the systematic uncertainty of our previous determination, by considering a different representation of the amplitude
and different optimization methods of the perturbative series. Moreover, we compare our result for the differential cross
section at the minimum |t| with a different approach, based on collinear kernel improvement. 相似文献
45.
D.?Yu?IvanovEmail author M.?I.?Kotsky A.?Papa 《The European Physical Journal C - Particles and Fields》2004,38(2):195-213
We evaluate in the next-to-leading approximation the forward impact factor for the virtual photon to light vector meson transition in the case of longitudinal polarization. We find that in the hard kinematic domain, both in the leading and in the next-to-leading approximation, the expression for the impact factor factorizes, up to power suppressed corrections, into the convolution of a perturbatively calculable hard-scattering amplitude and a meson twist-2 distribution amplitude.Received: 20 May 2004, Revised: 28 September 2004, Published online: 15 November 2004 相似文献
46.
Summary An offshore mooring platform for supertankers may often turn out to be an ideal solution for the problem of installing a meteorological
station. Its location may be particularly desirable for the purpose of recording and analysing sea wave motion in deep water
or in the intermediate zone between shallow and deep water. We are reporting the preliminary results obtained through the
operation of a subsurface sensor at the mooring platform off the harbour of Genoa.
Riassunto Una piattaforma per l’ormeggio di superpetroliere può diventare la sede ideale per una stazione meteorologica e, più in particolare, per una stazione di misura di moto ondoso in acque profonde o in zone di transizione. Si presentano i risultati preliminari dell’analisi di una mareggiata ottenuti mediante l’impiego di un sensore di pressione installato sulla piattaforma di ormeggio di Multedo (Genova).
Резюме Оказывается, что причальная платформа в открытом море для супертанкеров может часто являтся идеальным решением проблемы установки метеорологической станции. Ее расположение может Быть подходящим для целей регистрации и анализа движения морских волн на глубокой воде или в промежуточной зоне между мелкой и глубокой водами. Мы приводим предварительные результаты, полученные с помощью поверхностного датчика на причальною платформе вне гавани Генуи.相似文献
47.
Di Giamberardino Paolo Iacoviello Daniela Papa Federico Sinisgalli Carmela 《Nonlinear dynamics》2021,106(2):1239-1266
Nonlinear Dynamics - An epidemic multi-group model formed by interconnected SEIR-like structures is formulated and used for data fitting to gain insight into the COVID-19 dynamics and into the role... 相似文献
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