نتایج جستجو برای: rock fragmentation

تعداد نتایج: 73406  

Journal: :anatomical sciences journal 0
houshang rafighdoost mir mehrdad farsi maryam javadi soraya khafri

introduction: tegrity is the most important component for transferring genetic information sperm dna fragmentation is considered a component of male infertility. its assessment comprises conventional semen analysis of which emphasis is placed on its evaluation in fertility clinics. in this study, we investigate the relationship between sperm parameters of motility, morphology, concentration, an...

Journal: :international journal of agricultural science, research and technology in extension and education systems 0
onwuchekwa raphael iheke department of agricultural economics michael okpara university of agriculture, umudike pmb 7267, umuahia, abia state, nigeria ebuka testimony amaechi department of agricultural economics, michael okpara university of agriculture, umudike. p. m. b. 7267, umuahia, abia state, nigeria.

this study analyzed the determinants of the productivity of smallholder arable crop farmers with a particular focus on land fragmentation using the simpson index as measures of land fragmentation in imo state of nigeria. data collected by using structured questionnaire and interview schedules were analyzed using simple descriptive statistics; simpson index and regression analysis. results showe...

Journal: :Frontiers in Earth Science 2023

In the study of pre-fabricated single-fissured rock, failure mode, mechanical properties and propagation law rock are affected by length inclination angle fissure. this study, artificially prepared marble-like rocks with different fissure characteristics were used as representatives, using PFC 2D software to establish a uniaxial compression model tests for fissures. The effects lengths angles o...

Journal: :International Journal of Coal Science & Technology 2022

Abstract Deep rock mass tends to be broken into blocks when mining for materials deep below the surface. The layer of roof mine can regarded as a system fractured mass. When subjected high ground stress and mining-induced disturbance, effect ultra-low friction block easily becomes apparent, induce burst other accidents. By taking research object, this study developed test experimentally examine...

Journal: :Frontiers in Earth Science 2022

In order to study the effect of loading rate on rockburst, an indoor test single-face fast unloading-three directions and five-face stress-vertical continuous is conducted under different rates using a new true-triaxial rockburst system. The entire process inoculation-occurrence-development completely accurately reproduced. fragmentation degree, fractal dimension, Weibull distribution character...

Journal: :InterCarto. InterGIS 2021

The study of the nival-glacial objects Munku-Sardyk Range (East Sayan) as good long-term indicators climate development has been going on for more than 100 years. In addition to most studied glaciers Peretolchin glacier and second largest Radde glacier, found various transitional glacial-permafrost formations permafrost-ice-rock buried glaciers, which in area were virtually un explored. One suc...

Journal: :Computer Vision and Image Understanding 2008
Matthew J. Thurley Kim C. Ng

Once segmentation of 3D surface data of a rock pile has been performed, the next task is to determine the visibility of the surface rocks. A region boundary-following algorithm that accommodates irregularly spaced 3D coordinate data is presented for determining this visibility. We examine 3D surface segmentations of laboratory rock piles and determine which regions in the segmentation correspon...

Journal: :International journal of the Society of Materials Engineering for Resources 2022

This paper proposes a method to estimate the particle (rock) size distribution of muckpile using Deep Learning based on 3D shape information given by photogrammetry. Optimization blasting is crucial increase productivity mining operations. However, since internal structure ground (bedrock) usually unknown, it difficult set appropriate parameters, amounts explosives, location and timing. In orde...

2015
Tímea Szabó Gábor Domokos John P. Grotzinger Douglas J. Jerolmack

The discovery of remarkably rounded pebbles by the rover Curiosity, within an exhumed alluvial fan complex in Gale Crater, presents some of the most compelling evidence yet for sustained fluvial activity on Mars. While rounding is known to result from abrasion by inter-particle collisions, geologic interpretations of sediment shape have been qualitative. Here we show how quantitative informatio...

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