abstract soil crust decreases soil infiltration and prevents plant stablishment. thus reduction of crust effects is a prominent way to avert desertification. this study was conducted to investigate the effect of polyacrylamide on emergence of canola seedlings in a crusted soil and some physicochemical properties of soil such as ph, ec, sar and bulk density in a field located in date and tropica...

Self-assembly is a ubiquitous physicochemical phenomenon. It is inherent to molecular recognition effects in the biological domain, and thus presents a basis for understanding the constitution and dynamic organization of living beings. However, it is argued in this paper that the very notion of self-assembly presents an incorrect and misleading one for the physical effects that it stands for. S...

A positive correlation between salivary characteristics and Caries resistance in Children has been reported in literature. Such a correlation is also observed in Down’s syndrome population. The aim of this study is to gather recent information about various salivary characterestics of Down’s syndrome children. It includes physical, chemical and ionic properties. Characteristics like Amylase and...

Abstract-This paper describes a computer program which converts the text of user input and system responses from an on-line search system into fixed format records which describe the interaction. It also outlines the syntax of the query language and the format of the output record produced by the parser. The study discusses problems in constructing the parser. the logic of the parser and its pe...

Physical chemistry is the branch of chemistry that establishes and develops the principles of the subject in terms of the underlying concepts of physics and the language of mathematics. Its concepts are used to explain and interpret observations on the physical and chemical properties of matter. Physical chemistry is essential for developing and interpreting the techniques used to determine str...

Digital beamforming algorithms are commonly used for spatial filtering which effectively result in more benign channel characterestics with reduced interference and delay spread. A new constrained beamforming (CBF) algorithm is presented which allows optimum beam steering and interference cancellation for arbitrarily spaced directions The proposed CBF combines the properties of the Bartlett and...

The origin of the concept of a molecular complex between oxygen and hemoglobin can be traced to Stokes, a century and a half ago. Subsequently, physicochemical concepts of equilibria provided a path to quantitative formulations of these ligand-receptor interactions. Then, it took a quarter of a century before a proper format was prepared in terms of four stoichiometric equilibria and their asso...