Four Factors Influencing Observed Rock Properties

2009 ◽  
pp. 21-21-16 ◽  
Author(s):  
PG Chamberlain ◽  
EM Van Eeckhout ◽  
ER Podnieks
Keyword(s):  
Rock Properties ◽  
Factors Influencing

scholarly journals Blast-Casting Mechanism and Parameter Optimization of a Benched Deep-Hole in an Opencast Coal Mine

2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
Li Ma ◽  
Xingping Lai ◽  
Jianguo Zhang ◽  
Shuangshuang Xiao ◽  
Leiming Zhang ◽  
...  
Keyword(s):  
Factor Analysis ◽  
Casting Process ◽  
Rock Properties ◽  
Specific Charge ◽  
Deep Hole ◽  
Analysis Method ◽  
Analysis Model ◽  
Factors Influencing ◽  
Powder Factor ◽  
Minimum Resistance

During the research on bench deep-hole blast casting, the blast-casting parameters are directly related to the blast-casting results, so it could reveal the mechanism for improving the effect thereof. Based on the principle of the plane charge method, both the stress wave and detonation gas were considered to affect rock fragmentation and casting, a model of overburden fragmentation and casting process around the blasting hole was established, and bench deep-hole blast-casting behaviours were elucidated. By using the Factor Analysis Method (FAM), a correlation analysis model of factors influencing blast-casting results was built. The results proved that powder factor (or specific charge) ranked first in terms of its influence, followed by hole spacing, minimum resistance line, burden, and bench height. The formulae for calculating the limit powder factor value and the spacing of blasting holes were derived for different rock properties. The results showed that the optimum hole spacing was no more than 12.49 m and the powder factor was no more than 0.75 kg/m3, and it proved that an effective casting percentage (ECP) of 34% could be realized.

scholarly journals Geoecological modelling of potential natural vegetation in the Limnytsia source area

2014 ◽  
pp. 32-38
Author(s):  
Roman Kulachkovskyy
Keyword(s):  
Climatic Factors ◽  
Source Area ◽  
Natural Vegetation ◽  
Rock Properties ◽  
Field Observations ◽  
Potential Natural Vegetation ◽  
Regional Literature ◽  
Factors Influencing ◽  
Gis Environment ◽  
Active Temperature

The concept of a natural morphogenic geoecosystem was used to model the vegetation in the GIS environment. The edaphic factors used in modeling included landform elements characteristics (slope and concavity/convexity) as well as the soil and the parent rock properties that define drainage. The climatic factors influencing the distribution of the vegetation embraced annual sums of precipitation and of active temperature. The information about the ecological interrelations between the factors and the vegetation was taken from the regional literature as well as from the field observations. Key words: Ukrainian Carpathians, potential natural vegetation, natural morphogenic geoecosystem.

Factors influencing adhesive bonding at the bone/implant interface

1992 ◽  
Vol 50 (2) ◽  
pp. 1114-1115
Author(s):  
Julie A. Martini ◽  
Robert H. Doremus
Keyword(s):  
Electron Microscopy ◽  
Adhesive Bonding ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Bone Implant ◽  
Factors Influencing ◽  
Lr White ◽  
Transmission Electron ◽  
New Zealand White Rabbits ◽  
Scanning Electron

Tracy and Doremus have demonstrated chemical bonding between bone and hydroxylapatite with transmission electron microscopy. Now researchers ponder how to improve upon this bond in turn improving the life expectancy and biocompatibility of implantable orthopedic devices.This report focuses on a study of the- chemical influences on the interfacial integrity and strength. Pure hydroxylapatite (HAP), magnesium doped HAP, strontium doped HAP, bioglass and medical grade titanium cylinders were implanted into the tibial cortices of New Zealand white rabbits. After 12 weeks, the implants were retrieved for a scanning electron microscopy study coupled with energy dispersive spectroscopy.Following sacrifice and careful retrieval, the samples were dehydrated through a graduated series starting with 50% ethanol and continuing through 60, 70, 80, 90, 95, and 100% ethanol over a period of two days. The samples were embedded in LR White. Again a graduated series was used with solutions of 50, 75 and 100% LR White diluted in ethanol.

Factors Influencing Electrophysiologic Responsivity in Normal Adults

1965 ◽  
Vol 8 (4) ◽  
pp. 323-347
Author(s):  
Robert Goldstein ◽  
Benjamin RosenblÜt
Keyword(s):  
Conditioned Stimulus ◽  
White Light ◽  
Pure Tone ◽  
Alpha Rhythm ◽  
White Women ◽  
White Men ◽  
Inverse Relation ◽  
Factors Influencing ◽  
Electrodermal Responses ◽  
Normal Adults

Electrodermal and electroencephalic responsivity to sound and to light was studied in 96 normal-hearing adults in three separate sessions. The subjects were subdivided into equal groups of white men, white women, colored men, and colored women. A 1 000 cps pure tone was the conditioned stimulus in two sessions and white light was used in a third session. Heat was the unconditioned stimulus in all sessions. Previously, an inverse relation had been found in white men between the prominence of alpha rhythm in the EEG and the ease with which electrodermal responses could be elicited. This relation did not hold true for white women. The main purpose of the present study was to answer the following questions: (1) are the previous findings on white subjects applicable to colored subjects? (2) are subjects who are most (or least) responsive electrophysiologically on one day equally responsive (or unresponsive) on another day? and (3) are subjects who are most (or least) responsive to sound equally responsive (or unresponsive) to light? In general, each question was answered affirmatively. Other factors influencing responsivity were also studied.

Factors Influencing Pressure in the Portal Vein as Studied in the Intact Animal

1950 ◽  
Vol 16 (1) ◽  
pp. 194-210 ◽  
Author(s):  
Frederick W. Hoffbauer ◽  
Jesse L. Bollman ◽  
John L. Grindlay
Keyword(s):  
Portal Vein ◽  
Intact Animal ◽  
Factors Influencing
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