نتایج جستجو برای: فرمول بندی delta n
تعداد نتایج: 1093078 فیلتر نتایج به سال:
For an integer n ≥ 3, the clutter ∆n := { {1, 2}, {1, 3}, . . . , {1, n}, {2, 3, . . . , n} } is called a delta of dimension n, whose members are the lines of a degenerate projective plane. In his seminal paper on non-ideal clutters, Alfred Lehman manifested the role of the deltas as a distinct class of minimally non-ideal clutters [DIMACS, 1990]. A clutter is delta free if it has no delta mino...
The stable nitrogen isotope values (delta(15)N) of the essential amino acid (EAA) leucine and the delta(15)N values of six non-essential amino acids (NEAAs) from plankton size fractions from the South China Sea (SCS) were analysed. Data from the SCS were collected during two cruises in July 2003 and 2004 onboard of RV Nghien Cuu Bien. The delta(15)N values of alanine, aspartic acid, glutamic ac...
Some methods of tissue preservation have significant effects on values of stable isotopes of carbon (delta(13)C) and nitrogen (delta(15)N), but studies on this topic are scattered in the literature. The goals of this study were to (1) summarize the results from studies of preservation effects in the literature and (2) test the effects of four common preservatives on delta(13)C and delta(15)N in...
Ratios of nitrogen (N) isotopes in leaves could elucidate underlying patterns of N cycling across ecological gradients. To better understand global-scale patterns of N cycling, we compiled data on foliar N isotope ratios (delta(15)N), foliar N concentrations, mycorrhizal type and climate for over 11,000 plants worldwide. Arbuscular mycorrhizal, ectomycorrhizal, and ericoid mycorrhizal plants we...
Let $K$ be a field of characteristic zero, $X_n=\{x_1,\dots,x_n\}$ set variables, $K[X_n]$ the polynomial algebra and $F_n$ free metabelian Lie rank $n$ generated by $X_n$ over base $K$. Well known result Weitzenb\"ock states that $K[X_n]^\delta=\big \{u\in K[X_n] \big\vert\ \delta(u)=0\big \}$ is finitely as an algebra, where $\delta$ locally nilpotent linear derivation $K[X_n]$. Extending thi...
We apply the Gromov–Hausdorff metric $$d_G$$ for characterization of certain generalized manifolds. Previously, we have proven that with respect to $$d_G,$$ n-manifolds are limits spaces which obtained by gluing two topological a controlled homotopy equivalence (the so-called 2-patch spaces). In present paper, consider manifold-like $$X^{n},$$ introduced in 1966 Mardeić and Segal, characterized...
We recently reported (+)-4-¿(alphaR)-alpha-¿(2S,5R)-4-allyl-2, 5-dimethyl-1-piperazinyl¿-3-methoxybenzyl-N,N-diethylbenzamide (1b, SNC80) as a novel nonpeptidic delta receptor agonist and explored the structure-activity relationships (SAR) of a series of related derivatives. We have found that delta binding activities and selectivity showed little change when the 3-methoxy group in 1b was remov...
ابتدا تعاریف و مفاهیمی را که در این رساله مورد استفاده قرار می گیرد را بیان می کنیم. سپس به معرفی فضاهایی می پردازیم که با آن ها سر و کار خواهیم داشت. و در پایان به معرفی چند قضیه و اصل می پردازیم. رده ای از دستگاه های بیضوی شبه خطی تباهیده egin{equation*} left{egin{array}{ll} -div (h_1 (x)| abla u|^{p-2} abla u )=lambda a(x)|u|^{p-2}u +lambda b(x)|u|^{alpha-1}|v|^{eta+1}u+f...
The energy landscape of helium-nitrogen mixtures is explored by ab initio evolutionary searches, which predicted several stable compounds in the pressure range from 25 to 100 GPa. In particular, monoclinic structure HeN$_{22}$ consists neutral He atoms, partially ionic dimers N$_{2}$$^{\delta-}$, and lantern-like cages N$_{20}$$^{\delta+}$. presence helium not only greatly enhances structural d...
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