Presented in this paper is the data model for ORION, a prototype database system that adds persistence and sharability to objects created manipulated object-oriented applications. The ORION consolidates modifies number of major concepts found many systems, such as objects, classes, class lattice, methods, inheritance. These are reviewed three enhancements conventional model, namely, schema evolution, composite versions, elaborated upon. Schema evolution ability dynamically make changes...

Different nanostructures (Ns), such as nanobelts, nanobricks and nanosheets, of polypyrrole (PPy) were successfully fabricated on stainless steel substrates by simply varying the scan rate deposition in potentiodynamic mode. These PPy Ns characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission (TEM), surface area measurement. The XRD analysis showed formation amorphous thin films, FTIR studies confirmed...

SQL is a high-level nonprocedural data language which has received wide recognition in relational databases. One of the most interesting features nesting query blocks to an arbitrary depth. An SQL-like nested depth shown be composed five basic types nesting. Four them have not been well understood and more work needs done improve their execution efficiency. Algorithms are developed that transform queries involving these into semantically equivalent amenable efficient processing by existing...

We prepared metallic-nanoparticle-embedded one-dimensional titanium dioxide (1D-TiO2) via a one-step electrospinning process, in which Au or Ag metallic nanoparticles between 5 and 10 nm diameter were incorporated within the TiO2 nanofibers. After calcination of composite nanofibers at high temperature 450 °C, converted to 1D-TiO2 by thermal decomposition polyvinylpyrrolidone (PVP). This process simultaneously changed metal precursors (AgNO3 HAuCl4·3H2O) (Ag Au) produce nanofiber composites...

Abstract Recently our modern society is demanding flexible, low‐cost, and lightweight electrochemical energy storage systems, which are very important in variety of applications ranging from portable consumer electronics to large industrial‐scale power management. Among different flexible supercapacitors have been considered as one the most promising candidates due their significant merits such high density along with unique properties being lightweight, shape versatile, eco‐friendly...

The conventional models of authorization have been designed for database systems supporting the hierarchical, network, and relational data. However, these are not adequate next-generation that support richer data include object-oriented concepts semantic modeling concepts. Rabitti, Woelk, Kim [14] presented a preliminary model use as basis an mechanism in such systems. In this paper we present fuller fills few major gaps cannot fill We also further formalize notion implicit refine...

VLSI CAD applications deal with design objects that have an interface description and implementation description. Versions of a common but differ in their implementations. A molecular object is modeling construct which enables database entity to be represented by two sets heterogeneous records, one set describes the object's other its implementation. Thus reasonable starting point for begin concept objects. In this paper, we identify concepts are fundamental capturing semantics versions...

Electricity was produced by catalytic oxidation of carbon monoxide (CO) using gold catalysts at room temperature. The observed rates are faster than conventional processes operating 500 kelvin or higher for the conversion CO with water to produce hydrogen and dioxide through water-gas shift (WGS). By eliminating WGS reaction, we remove need transport vaporize liquid in production energy portable applications. This process can use CO-containing gas streams from reforming hydrocarbons an...

In object-oriented systems, an object may recursively reference any number of other objects. The references, however, do not capture special relationships between An important semantic relationship which be superimposed on a is the IS-PART-OF pair A set objects related by collectively called composite object. earlier paper [KIM87b] presented model has been implemented in ORION database system at MCC. Although composite-object feature found quite useful, suffers from serious shortcomings,...

Membranes of gold nanotubes in polycarbonate films are used to study catalytic reactions at gas–liquid interfaces. The properties for CO oxidation with O2 can be enhanced by liquid water and promoted increasing the pH value solution. membrane is sandwiched between other membranes that contain thiol-functionalized nanotubes, which control mass transport central reaction zone (see picture). An exciting discovery area heterogeneous catalysis observation nanoparticles on high-surface-area...

A surfactantless, one-pot reduction approach for Pd@Pt core–shell nano-stars on reduced graphene oxide with enhanced catalytic activity and stability methanol oxidation in alkaline media.

In this paper, ZnMn2O4 mesoscale tubular arrays on current collectors were successfully synthesized using a reactive template route combined with postcalcination process through the shape-preserving conversion of ZnO nanorod in aqueous solutions at room temperature. On basis experimental analyses, including X-ray diffraction, Raman spectroscopy, scanning electron microscopy, and transmission plausible formation mechanism was proposed which solid nanorods are gradually transformed to tubules...

This paper identifies data modelling and access sharing requirements which multimedia applications impose on a database system. It shows the capabilities of an object-based model indicates extensions are needed to meet aspects these requirements. A logical implementation operations is described. The generalizes notions instantiation generalization in standard object-oriented paradigm, augments it with aggregation relationships specialized for application environment. Objects may exist...