Pyrolysis of low density polyethylene (LDPE) by equilibrium fluid catalytic cracking (FCC) was studied in a stirred reactor under different process parameters. In this work, the effect of process parameters such as degradation temperature (420-510°C), catalyst/polymer ratio (0-60%), carrier gas type (H2, N2, ethylene, propylene, Ar and He), residence time and agitator speed (0-300 rpm) on the c...

Characterization of heavy end, as plus fraction, is among the most crucial steps in predicting phase behavior of a hydrocarbon fluid system. Proper selection of single carbon number (SCN) distribution function is essential for heavy end characterization. The SCN distribution function is subject to fluid nature. The exponential distribution function has been and is widely applied to gas condensa...

The cubic nonlinear Schrödinger equation with repulsive nonlinearity and elliptic function potential in two-dimensions models a repulsive dilute gas Bose–Einstein condensate in a lattice potential. A family of exact stationary solutions is presented and its stability is examined using analytical and numerical methods. All stable trivial-phase solutions are off-set from the zero level. Our resul...

We discuss the atom-atom scattering problem across a Feshbach resonance in a two-dimensional dilute Bose gas at zero temperature, in the limit where the s-wave scattering length exceeds the width of the vertical confinement. We determine a tunable coupling-strength parameter and by controlling it we evaluate how the condensate wave function spreads out with increasing atom-atom repulsions. We a...

Bose-Einstein condensation (BEG) of atoms with attractive mteractions i:< profoundly different from BEC of atoms with repulsive interactions. \Ye describe expenments with Bose condensates of 'Li atoms ..•...hich are weakJy attracting at uJ· tralaw temperature. We measure the distribution of condensate occupation numbers occurring in the gas using a near-resonant optical probe to image the atom ...

As an alternative method to lattice and perturbative QCD we suggest to include the gluon condensate into the parton propagators [1]. In this way non-perturbative effects are taken into account within the Green functions technique. In the case of a pure gluon gas with energy density ǫ and pressure p the gluon condensate can be related to the interaction measure ∆ = (ǫ− 3p)/T 4 via [2] 〈G〉T = 〈G〉...

The cubic nonlinear Schrr odinger equation with repulsive nonlinearity and elliptic function potential in two-dimensions models a repulsive dilute gas Bose{Einstein condensate in a lattice potential. A family of exact stationary solutions is presented and its stability is examined using analytical and numerical methods. All stable trivial-phase solutions are oo-set from the zero level. Our resu...

A quantum computer, with controlled decoherence, constructed out of a lattice based array of qubits undergoing a particular local and unitary evolution is effectively a bose condensate. Presented is a coupled lattice gas system, a quantum lattice gas and a classical lattice gas in mutual contact through “external” potentials. The coupled lattice gas system behaves like liquid 4He where it is a ...

We report the creation of a Bose-Einstein condensate using buffer-gas cooling, the first realization of BEC using a broadly general method which relies neither on laser cooling nor unique atom-surface properties. Metastable helium (He*) is buffer-gas cooled, magnetically trapped, and evaporatively cooled to quantum degeneracy. 10 atoms are initially trapped, leading to Bose-Einstein condensatio...

Stimulated small-angle light scattering was used to measure the structure factor of a Bose-Einstein condensate in the phonon regime. The excitation strength for phonons was found to be significantly reduced from that of free particles, revealing the presence of correlated pair excitations and quantum depletion in the condensate. The Bragg resonance line strength and line shift agreed with predi...