We give criteria for the rationality of Cantor series ∑ ∞ n=1 bn a1···an and series ∑ ∞ n=1 bn an where a1, a2, · · · and b1, b2, · · · are integers such that an > 0 and the series converge. We precisely say when ∑ ∞ n=1 bn a1···an is rational (i) if {an} ∞ n=1 is a monotonic sequence of integers and bn+1 − bn = o(an+1) or lim supn→∞( bn+1 an+1 − bn an ) ≤ 0, and (ii) if bn+1 an+1−1 ≤ bn an−1 f...

Reactive nanolaminates afford a promising route for the low-temperature synthesis of zirconium diboride, an ultrahigh-temperature ceramic with metallic properties. Although the addition of carbon is known to facilitate sintering of ZrB2, its effect on the kinetics of the formation reaction has not been elucidated. We have employed a combined approach of nanocalorimetry and first-principles theo...

access at Springerlink.com ABSTRACT B4C coatings for B-based neutron detector applications were deposited using high-power impulse magnetron sputtering (HiPIMS) and direct current magnetron sputtering (DCMS) processes. The coatings were deposited on Si(001) as well as on flat and macrostructured (grooved) Al blades in an industrial coating unit using B4C compound targets in Ar. The HiPIMS and D...

Surfaces of boron carbide (B4C) were implanted with 200 keV N: or 100 keV AI + ions to a dose of 8 x 10” cm‘. Ultralow load indentation via the Nanoindenter was used to determine the changes in surface hardness and elastic modulus following implantation. A pin-on-disk testing device in ultrahigh vacuum was used for measuring changes in friction and wear of the implanted disks. Results of hardne...

In micro-electrical discharge machining (micro-EDM), dielectric plays a significant role during the machining process as different types of dielectrics have different chemical compositions, cooling rates and dielectric strengths. For this, dissimilar process responses are accounted when machining in EDM at micron level. The present paper investigates micro-EDM characteristics such as material r...

OBJECTIVE To classify type 1 diabetic females with bulimia nervosa (BN) by type of inappropriate compensatory behavior in order to prevent weight gain (ICB) and to investigate the group differences. RESEARCH DESIGN AND METHODS Type 1 diabetic females with BN, diagnosed by structured diagnostic interview based on DSM-IV (Diagnostic and Statistical Manual of Mental Disorders, 4th ed.) criteria,...

Human small cell lung cancers (SCLC) produce and secrete the regulatory peptide bombesin (BN) or its mammalian counterpart gastrinreleasing peptide (GRP). In addition, several SCLC tumor lines have been shown to express high affinity receptors for BN/GRP. On the basis of these findings, we investigated the effect of exogenously added BN and GRP on the soft agarose colony growth of a panel of hu...

Cationic BN-embedded polycyclic aromatic hydrocarbons (BN-PAH+s) were synthesized from a nitrogen-containing macrocycle via pyridine-directed tandem C?H borylation. Incorporating BN into PAH+ resulted in remarkable hypsochromic shift due to an increase the LUMO energy and symmetry changes of HOMO LUMO. Electrophilic substitution or anion exchange BN-PAH+ possessing tetrabromoborate as counter (...

The mechanical properties of different polymer matrix composites are discussed in this research study. These multiphase materials which reinforcing elements and a suitably combined. 18 PMCs, including nylon 66 reinforced with 5, 15, 25% wt% silicon carbide (SiC) boron (B4C), were evaluated using an injection moulding technique at three pressures optimization process parameters like reinforcemen...