Experimental determination of the physical properties rocks under conditions simulating in situ reservoir is great importance both for calculation reserves and interpretation well logging data. In addition, it also important preparation hydrocarbon field development projects. The study processes changes petrophysical controlled allows not only to determine their reliability but evaluate dynamic...

The modified second Zagreb index, symmetric difference inverse and augmented index are among the molecular descriptors which have good correlations with some physicochemical properties (such as formation heat, total surface area, etc.) of chemical compounds. By a random cyclooctane chain, we mean graph saturated hydrocarbon containing at least two rings such that all cyclooctane, every ring is ...

The low flow characteristics of heavy oil have brought many challenges to its exploitation. Looking for a cost-effective crude improver reduce the viscosity is currently most important challenge. Small-molecule improvers meet above requirements and become an ideal target oilfield production. In this article, three kinds barium salts alkylbenzene sulfonates with different lengths alkyl chains we...

Abstract Lipids are biomolecules which present in plants as general metabolites with different functions such structural, protective and also storage material. Plants produce a high number of fatty acids: the most common structural types long linear hydrocarbon chains, saturated or unsaturated an even carbon atoms. In addition, accumulate rare acids reference to their occurrence structures arra...

The calixarene derivative used in this study (tetra-p-guanidinoethylcalix[4]arene) shows vitro activity against different Gram-positive and Gram-negative bacteria. interaction between bacterial cell membranes the water-soluble was investigated using model lipids spread as monomolecular films at air–water interface. Compression adsorption experiments, well Brewster angle microscopy, polarization...

in this study, the effect of hydrocarbon and rosin ester resins combination on the physical and mechanical properties of thermoplastic road markings were evaluated. at first, two basic thermoplastic road marking formulations based on hydrocarbon and rosin ester resins were prepared. several samples of the blends of two basic formulations for thermoplastic road marking were characterized and com...

measurement of soil saturated hydraulic conductivity, ks, is normally affected by flow patterns such as macro pore; however, most current techniques do  not differentiate flow types, causing major problems in describing water and chemical flows within the soil matrix. this study compares eight models for scaling ks and predicted matrix and macro pore ks, using a database composed of 50 datasets...

let $l$ be a lattice in $zz^n$ of dimension $m$. we prove that there exist integer constants $d$ and $m$ which are basis-independent such that the total degree of any graver element of $l$ is not greater than $m(n-m+1)md$. the case $m=1$ occurs precisely when $l$ is saturated, and in this case the bound is a reformulation of a well-known bound given by several authors. as a corollary, we show t...