نتایج جستجو برای: defining 5 parameters of rock r
تعداد نتایج: 21404451 فیلتر نتایج به سال:
Phosphate tailings pose significant risk to the environment as point sources of basic, carbonate-rich effluents. This waste may be judiciously used for the biofertilizer preparation. The enrichment of compost by adding low grade rock phosphate also offers a potential preposition for the effective utilization of insoluble P. Experimentally, the compostable material (Biogas spent slurry) is mixed...
Due to the insufficiency of damage model, on the basis of studying deeply deformation and damage mechanism of the rock mass, considering the process and phenomenon of the damage of rock mass, damage part can be divided into two parts: the damage material and micro defects due to the change of damage material, then this paper puts forward a new definition of damage. Besides it proposes an impact...
Intact rock properties together with rock mass characteristics should be well investigated for selection of proper tunnel boring machine (TBM) for tunneling in various ground conditions. This is due to the significant impact of rock mass characteristics on machine performance. TBMs are site specific and designed for optimal performance in given ground conditions. When selected and put to work a...
There are various parameters that affect stability and expansion of failure zones in under pressure tunnels. Among the important parameters that affect failure zones around the tunnels are cohesion and internal friction angle of the rock mass. In addition, the cross sectional shape is the considerable point in failure distribution around the tunnels. The stress analysis method is one of the app...
Well logs are principal sources of subsurface geological information. They provide significant information on mineralogical composition, texture, sedimentary structures and petrophysical properties such as porosity and permeability. By compiling data from various well logs, one can discriminate sedimentary units with comparable log characteristics. Sedimentary units with similar fluid flow and ...
of attempted suicides in Italy. Neuropsychobiology. 2000;41: 62–72. 5. Micciolo R, Williams P, Zimmermann-Tansella C, Tansella M. Geographical and urban-rural variation in the seasonality of suicide: some further evidence. J Affect Disord. 1991;21: 39–43. 6. Rock DJ, Greenberg DM, Hallmayer JF. Impact of case fatality on the seasonality of suicidal behaviour. Psychiatry Res. 2005;137: 21–7. L. ...
Optimization of reservoir parameters is an important issue in petroleum exploration and production. The Ant Colony Optimization(ACO) is a recent approach to solve discrete and continuous optimization problems. In this paper, the Ant Colony Optimization is usedas an intelligent tool to estimate reservoir rock properties. The methodology is illustrated by using a case study on shear wave velocity...
3 Vincent Hernandez, Thibaut Crépin, Andrés Palencia, Stephen Cusack, Tsutomu Akama, 4 Stephen J. Baker, Wei Bu, Lisa Feng, Yvonne R. Freund, Liang Liu, Maliwan Meewan, 5 Manisha Mohan, Weimin Mao, Fernando L. Rock, Holly Sexton, Anita Sheoran, Yanchen 6 Zhang, Yong-Kang Zhang, Yasheen Zhou, James A. Nieman, Mahipal Reddy Anugula, El 7 Mehdi Keramane, Kingsley Savariraj, D. Shekhar Reddy, Rashm...
Background: Ischemic preconditioning (IPC) is a brief episode of ischemia/reperfusion (I/R) that protects the brain from the damage induced by subsequent prolonged ischemia. Aim: To study the neuroprotective mechanism of IPC. Methods: 30 adult male Wistar rats (150 250 g) were divided into three groups 10 rats in each; the first group was sham-operated and served as a control, I/R group of rats...
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