Rock brittleness is one of the most important issues in rock mechanics. There is not yet an available method for defining or measuring directly the rock brittleness. The aim of this study is to suggest a new chemical index parameter for the prediction of basaltic rocks’ brittleness. In the order of that abovementioned purpose, a total of 23 basaltic rock samples were collected from different region of Turkey. Samples were initially tested to determine their chemical properties. Then, mechanical tests were carried out to define the brittleness indices (B1, B2, and B3) for each corresponding sample. Finally, relations between parameters obtained from test results and brittleness indices were examined with regression analysis. According to the results obtained, a new chemical parameter (CP) was proposed for predicting brittleness via major oxide element components of basaltic rocks. It was found out that, B1 and B2 are not reliable parameters for predicting the different properties, however; B3 and CP can be employed as good criteria for predicting the different properties of basaltic rocks (especially in terms of chemical and mechanical properties)., Candan Bilen, Selman Er, Atiye Tuğrul and Murat Yilmaz., and Obsahuje bibliografii
An analytical solution for the creeping flow of an inelastic fluid past a solid sphere has been obtained using an empirical 3-parameter fluid model. The governing equations of motion have been solved aproximately using a perturbation approach. Expressions have been obtained for the Stokes stream function and the drag experienced by the stationary sphere. It is shown that the drag for the non-Newtonian fluid is greater than the one predicted by the classical Stokes formula. and Použitím trojparametrického empirického modelu tekutiny sme získali analytické riešenie pomalého prúdenia neelastickej tekutiny okolo pevnej gule. Pohybové rovnice boli riešené približne metódou malých rozruchov. Získali sme vzťahy pre výpočet Stokesovej prúdovej funkcie a pre odpor stojacej gule. Bolo ukázané, že tento odpor z obtekania je pre nenewtonskú tekutinu väčší, ako vyplýva z klasického vzťahu Stokesa pre newtonskú tekutinu.