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101.
102.
The pyrolysis of the long (C≥5) chain n-alkanes is reviewed with emphasis on the radical chain mechanism and on the reactions of the intermediate alkyl radicals. The effects of the experimental conditions and conversion on the types and distributions of the final products are also evaluated. The Arrhenius rate parameters are summarized for both the elementary steps and the overall decomposition reactions. 相似文献
103.
E Darzynkiewicz I Labadi D Haber K Burger H L?nnberg 《Acta chemica Scandinavica. Series B: Organic chemistry and biochemistry》1988,42(2):86-92
First-order rate constants for the alkaline opening of the imidazole ring of several 7-methylguanine nucleotides and their structural analogues were determined. The results obtained suggested that intramolecular interaction between the negatively charged 5'-phosphate group and the positively charged imidazole ring markedly retard the attack of hydroxide ion on the C8 atom of the 7-methylguanine ring. In contrast, hardly any influence on the acidities of the interacting base and phosphate moieties was detectable. No effect on the complexing of the phosphate group with magnesium(II) ion could be detected. 相似文献
104.
Imre Brny 《Discrete Mathematics》1982,40(2-3):141-152
The following theorem is proved. If the sets
and a εn+1i=1 conv Vi, then there exist elements vi ε Vi (i=1…,n+1) such that a ε conv{v1,…,vn+1}. This is generalization of Carathéodory's theorem. By applying this and similar results some open questions are answered. 相似文献
105.
Imre Bucsi György Szöllsi Tibor Bartók Mihály Bartók 《Reaction Kinetics and Catalysis Letters》2005,85(2):361-366
Summary The first identification of aluminium containing oxonium cations having chiral atomic groups is described which may play a role in enantioselective hydrogenation of ethyl pyruvate using Pt-alumina catalyst in AcOH. The structure these cations at m/z = 509 and m/z = 567 is: [O{Al(OAc)2}2Al(OPy.OLt)]+ and [O(AlOAc.OLt)2Al(OPy)2]+ 相似文献
106.
Mucsi Z Szabó A Hermecz I Kucsman A Csizmadia IG 《Journal of the American Chemical Society》2005,127(20):7615-7631
The activation parameters of the pericyclic Meisenheimer rearrangement and a competitive rearrangement of N-propargylmorpholine N-oxide were determined by experimental and computational methods. A number of aprotic and protic solvents of different polarities and hydrogen bond-forming abilities and the roles of electron-pair acceptor additives were investigated. The reaction kinetics were followed by means of NMR. In protic solvents, isotope-labeling experiments revealed a novel inverse secondary kinetic isotope effect (k(H)/k(D) about 0.8) for the rate-determining cyclization step, probably occurring because of a C(sp) --> C(sp(2)) change in hybridization at the reaction center. In molecular computations at the B3LYP/6-31++G(d,p) level of theory, implicit, explicit, and joint explicit-implicit solvent models were used. The explicit-implicit model and molecular dynamic simulations gave the most accurate results. The components of the rate-controlling solvent effect are discussed, and general equations are proposed for accurate prediction of the solvent-dependent activation parameters. 相似文献
107.
An IP system is a functionn taking finite subsets ofN to a commutative, additive group Ω satisfyingn(α∪β)=n(α)+n(β) whenever α∩β=ø. In an extension of their Szemerédi theorem for finitely many commuting measure preserving transformations, Furstenberg and Katznelson showed that ifS i ,1≤i≤k, are IP systems into a commutative (possibly infinitely generated) group Ω of measure preserving transformations of a probability space (X, B, μ, andA∈B with μ(A)>0, then for some ø≠α one has μ(? i=1 k S i({α})A>0). We extend this to so-called FVIP systems, which are polynomial analogs of IP systems, thereby generalizing as well joint work by the author and V. Bergelson concerning special FVIP systems of the formS(α)=T(p(n(α))), wherep:Z t →Z d is a polynomial vanishing at zero,T is a measure preservingZ d action andn is an IP system intoZ t . The primary novelty here is potential infinite generation of the underlying group action, however there are new applications inZ d as well, for example multiple recurrence along a wide class ofgeneralized polynomials (very roughly, functions built out of regular polynomials by iterated use of the greatest integer function). 相似文献
108.
Summary Let <InlineEquation ID=IE"1"><EquationSource Format="TEX"><![CDATA[<InlineEquation ID=IE"2"><EquationSource Format="TEX"><![CDATA[<InlineEquation
ID=IE"3"><EquationSource Format="TEX"><![CDATA[<InlineEquation ID=IE"4"><EquationSource Format="TEX"><![CDATA[<InlineEquation
ID=IE"5"><EquationSource Format="TEX"><![CDATA[<InlineEquation ID=IE"6"><EquationSource Format="TEX"><![CDATA[<InlineEquation
ID=IE"7"><EquationSource Format="TEX"><![CDATA[<InlineEquation ID=IE"8"><EquationSource Format="TEX"><![CDATA[<InlineEquation
ID=IE"9"><EquationSource Format="TEX"><![CDATA[$]]></EquationSource></InlineEquation>]]></EquationSource></InlineEquation>]]></EquationSource></InlineEquation>]]></EquationSource></InlineEquation>]]></EquationSource></InlineEquation>]]></EquationSource></InlineEquation>]]></EquationSource></InlineEquation>]]></EquationSource></InlineEquation>]]></EquationSource></InlineEquation>m>1$
be an integer, $B_m$ the set of all unit vectors of $\Bbb R^m$ pointing in the direction of a nonzero integer vector of the
cube $[-1,\,1]^m$. Denote by $s_m$ the radius of the largest ball contained in the convex hull of $B_m$. We determine the
exact value of $s_m$ and obtain the asymptotic equality $s_m\sim\frac{2}{\sqrt{\log m}}$. 相似文献
109.
Let K Rd be a sufficiently round convex body (the ratio
of the circumscribed ball to the inscribed ball is bounded by a
constant) of a sufficiently large volume.
We investigate the randomized integer convex hull
IL(K) = conv (K L), where L is a randomly translated and rotated
copy of the integer lattice Zd.
We estimate the expected number
of vertices of IL(K), whose behaviour is similar to the
expected number of vertices of the convex hull of Vol K
random points in K. In the planar case we also
describe the expectation of the missed area
Vol (K \ IL(K)). Surprisingly, for K a
polygon, the behaviour in this case
is different from the convex hull of random points. 相似文献
110.
Margit Imre 《Acta Mathematica Hungarica》1964,15(1-2):115-121
Ohne Zusammenfassung
Vorgelegt von
L. Fejes Tóth 相似文献