Let X be a completely regular space and let A(X) be a ring of continuous real-valued functions onX which is closed under local bounded inversion. We show that the structure space of A(X) is homeomorphic to a quotient of the Stone–Čech compactification of X. We use this result to show that any realcompactification of X is homeomorphic to a subspace of the structure space of some ring of continuo...

A new sandpile model is studied in which bonds of the system are inhibited for activity after a certain number of transmission of grains. This condition impels an unstable sand column to distribute grains only to those neighbours which have toppled less than m times. In this non-Abelian model grains effectively move faster than the ordinary diffusion (super-diffusion). A novel system size depen...

We report long, pointed ROSAT HRI observations of the hyperluminous galaxies IRAS F00235+1024, F12514+1027, F14481+4454 and F14537+1950. Two of them are optically classified as Seyfert-like. No X-ray sources are detected at the positions of any of the objects, with a mean upper limit LX/LBol ≃ 2.3 × 10 . This indicates that any active nuclei are either atypically weak at X-ray wavelengths or ob...

Horizontal contaminant transport through unsaturated soil been demonstrated both analytically and experimentally. The water and solute transport equations were solved using the Boltzman transformation, to convert the partial differential equations to ordinary differential equations. The resulted mathematical model was verified using experimental data. A laboratory scale column system was constr...

I nvestors with cash that is destined for stocks often use a dollar-cost averaging plan. They divide the cash into segments, and convert one segment at a time from cash to stocks according to a predetermined schedule. The alternative to dollar-cost averaging is lump-sum investment. The popularity of dollar-cost averaging can be traced back at least to the 1940s. (See, for example, discussions i...

Barnidipine hydrochloride is a long term dihydropyridine calcium channel blocker used for the treatment of hypertension. During the process development of barnidipine hydrochloride, four barnidipine impurities were detected by high-performance liquid chromatography (HPLC) with an ordinary column (Agilent ZORBAX Eclipse XDB-C18, 150 mm×4.6 mm, 5 µm). All these impurities were identified, synthes...

With the development of urban underground space and increased infrastructure functions, both scale engineering construction difficulties have globally. In structures in soft strata, especially coastal areas, limited bearing capacity foundations poses a significant challenge. The composite pile technologies employing an organic combination rigid andthe flexible column can enable efficient ground...

There are two entropy-based methods to deal with linear inverse problems, which we shall call the ordinary method of maximum entropy (OME) and the method of maximum entropy in the mean (MEM). Not only does MEM use OME as a stepping stone, it also allows for greater generality. First, because it allows to include convex constraints in a natural way, and second, because it allows to incorporate a...