While the basic chemical structure of a synthetic high polymer is usually well understood, many physical properties depend on such characteristics as chain length, degree of chain branching, and molecular weight, which are not easy to specify exactly in terms of a molecular formula. Moreover, the macromolecules in a given sample are seldom uniform in chain length or molecular weight (which for ...

It is argued that a characteristic length may be associated with the entropic state of a spherically symmetric black hole in the cosmological context. This length is much smaller than the Schwarzschild-radius of a black hole and may act as a regulator of arbitrarily high frequencies apparently entering the usual derivation of Hawking’s radiation.

We discuss the formation of large loops in adsorbed polymer layers when the bulk concentration C is large. This allows us to introduce a new characteristic length A that corresponds to the extension of the loops in the bulk. We find that A NC~/~ and increases from the screening length f to the radius of the chains when concentration increases. This

background & aims: endotracheal intubation is commonly performed in the intensive care unit. many international guidelines for difficult intubation management are available and the intensivists think that any endotracheal intubation in icu is potentially difficult with several complications. materials & methods: after obtaining ethical approval, this descriptive and analytical study was conduct...

abstract several root measuring methods have been developed until now but there is no single method of root measurement applicable for all situations. this study was conducted to evaluate the effects of a single trinexapac-ethyl (te) and paclobutrazol application on kentucky bluegrass root growth under three irrigation treatments. evaluating of root length density (rld), root surface area (rs) ...

Background & Aims: Endotracheal intubation is commonly performed in the intensive care unit. Many international guidelines for difficult intubation management are available and the intensivists think that any endotracheal intubation in ICU is potentially difficult with several complications. Materials & Methods: After obtaining ethical approval, this descriptive and analytical study was cond...

We prove an inequality for the number of periods in a word [Formula: see text] terms length and its initial critical exponent. Next, we characterize all length-[Formula: prefix characteristic Sturmian lazy Ostrowski representation text], use this result to show that our is tight infinitely many words text]. propose two related measures periodicity infinite words. Finally, also consider special ...