The Baroque and early Classical flutes have six finger holes that are small enough to be covered by the unaided fingers, and also positioned so as to allow this. They have a partly conical bore, which is narrower than that of the Boehm flute. We compare these instruments in terms of their sound spectra and intonation, and we explain some of the features of these in terms of their acoustic imped...

The biguanide concentration of polyhexamethylene biguanide hydrochloride (PHMB-HCl) was measured by non-aqueous titration with HClO4, argentometric titration, the Kjeldhal method, and colloidal titration. The summation value of non-aqueous titration and argentometric titration corresponded to two titrable nitrogens in five nitrogens per one unit of PHMB-HCl, and consisted with the result of the...

The objective of this study was to study the structure and physicochemical properties of biochar derived from apple tree branches (ATBs), whose valorization is crucial for the sustainable development of the apple industry. ATBs were collected from apple orchards located on the Weibei upland of the Loess Plateau and pyrolyzed at 300, 400, 500 and 600 ◦C (BC300, BC400, BC500 and BC600), respectiv...

Fixed point combinators (and their generalization: looping combinators) are classic notions belonging to the heart of λ-calculus and logic. We start with an exploration of the structure of fixed point combinators (fpc’s), vastly generalizing the well-known fact that if Y is an fpc, Y (SI) is again an fpc, generating the Böhm sequence of fpc’s. Using the infinitary λ-calculus we devise infinitel...

Quantitative determination of Br?nsted acid sites in acidic mordenite samples with varying proton concentrations has been studied using aqueous conductometric titration method. Conductometric titration of the ammonium form of mordenite with sodium hydroxide is feasible and the results indicate potential number of Br?nsted acid sites. However, Br?nsted acid sites concentration in acidic mordenit...

Abstract: Bitter almond shells (BAS) were inspected as a low-cost precursor in producing activated carbon (AC) through the optimized ZnCl2 activation route. The raw BAS impregnated with at multiple ratios (1:1 - 3:1 ZnCl2:BAS), followed by carbonization various temperatures (400 – 800 °C) for different durations (30 120 minutes) tubular reactor. typical AC sample was prepared using 1:1 ZnCl2:BA...

Hans-Juergen Boehm Computer Science Department, Rice University, Houston, TX 77251-1892, U.S.A. Mark Weiser Xerox Corporation, Palo Alto Research Center, 3333 Coyote Hill Road, Palo Alto, CA 94304, U.S.A. A later version of this paper appeared in Software Practice and Experience 18, 9, pp. 807-820. Copyright 1988 by John Wiley and Sons, Ld. The publishers rules appear to allow posting of prepri...