Heat Resistance of copolymers of alkyl methacrylates with <Emphasis Type="Italic">o</Emphasis>-allylphenol

The heat resistance of copolymers of alkyl methacrylates with o-allylphenol was studied. The possibility of preparing viscosity additives that would be more resistant to heat than alkyl methacrylate homopolymers was examined.     

Synthesis of graft copolymers based on 1-hexene oligomers and their trials as viscosity additives

Copolymers of decyl methacrylate with 1-hexene were prepared and tested as viscosity additives to petroleum oils. The influence of the concentration of the synthesized copolymers on the viscosity-temperature characteristics of petroleum oils was examined, and the thermal and mechanical stability of the copolymers in oils was evaluated.     

Topological phases: An expedition off lattice

Motivated by the goal to give the simplest possible microscopic foundation for a broad class of topological phases, we study quantum mechanical lattice models where the topology of the lattice is one of the dynamical variables. However, a fluctuating geometry can remove the separation between the system size and the range of local interactions, which is important for topological protection and ultimately the stability of a topological phase. In particular, it can open the door to a pathology, which has been studied in the context of quantum gravity and goes by the name of ‘baby universe’, here we discuss three distinct approaches to suppressing these pathological fluctuations. We complement this discussion by applying Cheeger’s theory relating the geometry of manifolds to their vibrational modes to study the spectra of Hamiltonians. In particular, we present a detailed study of the statistical properties of loop gas and string net models on fluctuating lattices, both analytically and numerically.     

A study of π−p → f0n reaction at momenta up to 50 GeV/c

A mass spectrum of π^oπ^o system in the final state of π^?p → π^oπ^on reaction has been studied at the momenta 20 to 50 GeV/c. The experiments were performed at the 70 GeV IHEP accelerator. In the mass distribution there has been selected a peak corresponding to f^o meson production cross section decreases in the power form with the momentum. The differential cross section follows exponential dependence, exp (bt).The mass spectrum of unbounded π^oπ^o system is satisfactorily described with multireggeon diagram of the ? and π exchange.