Poly( 1-butene) (PB) crystallizes from the melt in a metastable modification II (mod. II) which slowly transforms into the stable modification I (mod. I). X-ray wide angle (WAXS) measure­ ments show that in mod. I the size of the microparacrystallites (mPC’s) in chain direction, Z>oi2 * the polydispersity gj> of the size distribution in this direction, the lateral size D u o and the paracrystal...

The paper demonstrates that product configuration applications fit naturally the framework of answer set programming. It is shown that product configuration knowledge can be represented systematically and compactly using a logic program type rule language such that the answers of a configuration task, the configurations, correspond to the models of the rule representation.. The paper pr.es.~nts...

We demonstrate a powerful tool for high-resolution mid-IR spectroscopy and frequency metrology with quantum cascade lasers (QCLs). We have implemented frequency stabilization of a QCL to an ultra-low expansion (ULE) reference cavity, via upconversion to the near-IR spectral range, at a level of 1×10(-13). The absolute frequency of the QCL is measured relative to a hydrogen maser, with instabili...

BACKGROUND The differences between the metastatic property of moderately (Mod) and well (Wel) differentiated colorectal adenocarcinoma remain unclear. Since Mod is unable to form complete acini, therefore an epithelial-mesenchymal transition (EMT) can occur in that structure. Herein, we hypothesized that Mod metastasizes more easily than the Wel counterparts. METHODS The medical records of 28...

Proof. Suppose first that (m− 1)! ≡ −1 (mod m) for some positive integer m. If m is not prime then there exists a divisor d of m with 1 < d < m, so d|(m− 1)!. But d|m, so d| − 1, a contradiction. Thus, m must be prime. Suppose now that m is prime. If some residue class x modulo m has got a multiplicative inverse x with x 6≡ x (mod m) then they both drop out of (m−1)!. Hence, (m−1)! is congruent...

It is well known that the inverse function of y = x with the derivative y′ = 1 is x = y, the inverse function of y = c with the derivative y′ = 0 is nonexistent, and so on. Hence, on the assumption that the noninvertibility of the univariate increasing function y = f (x) with x > 0 is in direct proportion to the growth rate reflected by its derivative, the authors put forward a method of compar...

We prove that the 2-category of skeletally small abelian categories with exact monoidal structures is anti-equivalent to fp-hom-closed definable additive satisfying an exactness criterion. For a fixed finitely accessible category C products and structure appropriate assumptions, we provide bijections between subcategories C, Serre tensor-ideals Cfp-mod closed subsets Ziegler-type topology. prea...