The cold climate is a favorable parameter for the development of tension cracks and decrease of rock brittleness. Therefore, this paper attempts to investigate the Hamekasi porous limestone in order to predict the brittleness indices during freeze-thaw cycles. The freeze–thaw test was executed for one cycle including 16 h of freezing, and 8 h of thawing. The geo mechanical properties and brittl...

Since the housing reform in 1990s, China’s real estate market has expanded and developed rapidly. It quickly become pillar of national economy made a great contribution to economic growth. However, started late its development is not perfect, house prices show obvious volatility. Accurate prediction conducive government issuing appropriate regulatory policies, helping investors formulate correc...

klinkenberg permeability is an important parameter in tight gas reservoirs. there are conventional methods for determining it, but these methods depend on core permeability. cores are few in number, but well logs are usually accessible for all wells and provide continuous information. in this regard, regression methods have been used to achieve reliable relations between log readings and klinke...

knowledge management is a process that has been recently generated as an activity which is very important in the dynamic environment, and in the competitive scene. we believe that km is a process which its organizational knowledge is created from the individual knowledge of the members of the organization. the relevant studies have indicated that organizing based on work teams could be consider...

This study aimed to compare the robustness of OLS method with a robust regression model on data that had outliers. The methods used were M-estimation, MM-estimation, and S-estimation. step taken was check characteristics against Furthermore, modeled without outliers using M-, MM-, S-estimations. results very different between outlier models in method. It reflected intercept standard error varia...