Página 1 dos resultados de 1546 itens digitais encontrados em 0.039 segundos

## STATISTICAL TEST FOR GENOTYPE AND ENVIRONMENT CONTRIBUTION IN THE GENOTYPES x ENVIRONMENTS INTERACTION MATRIX

Fonte: INTERCIENCIA; CARACAS
Publicador: INTERCIENCIA; CARACAS

Tipo: Artigo de Revista Científica

ENG

Relevância na Pesquisa

55.69%

#GENOTYPE AND ENVIRONMENT CONTRIBUTION#GXE INTERACTION#NONCENTRAL CHI-SQUARE DISTRIBUTION#MODIFIED F TEST#MODELS#ECOLOGY

The objective of the present work was to propose a method for testing the contribution of each level of the factors in a genotypes x environments (GxE) interaction using multi-environment trials analyses by means of an F test. The study evaluated a data set, with twenty genotypes and thirty-four environments, in a block design with four replications. The sum of squares within rows (genotypes) and columns (environments) of the GxE matrix was simulated, generating 10000 experiments to verify the empirical distribution. Results indicate a noncentral chi-square distribution for rows and columns of the GxE interaction matrix, which was also verified by the Kolmogorov-Smirnov test and Q-Q plot. Application of the F test identified the genotypes and environments that contributed the most to the GxE interaction. In this way, geneticists can select good genotypes in their studies.; Conselho Nacional Cientifico e Tecnologico (CNPq); Brazilian science funding agencies; Brazilian science funding agencies; CNPq

Link permanente para citações:

## Teste estatístico para contribuição de genótipos e ambientes na matriz de interação GE; Statistical test for contribution in the interaction matrix of genotypes and environments

Fonte: Biblioteca Digitais de Teses e Dissertações da USP
Publicador: Biblioteca Digitais de Teses e Dissertações da USP

Tipo: Dissertação de Mestrado
Formato: application/pdf

Publicado em 21/07/2008
PT

Relevância na Pesquisa

55.72%

#Análise de dados#Contribution of genotypes and environ- ments#Distribuição qui-quadrada#Genética estatística#Genótipos.#Genotypes X environments interaction#Modified F test.#Non-central chi-squared distribution

O presente trabalho teve por objetivos propor um método para testar a contribuição de cada genótipo e ambiente para a interação genótipos X ambientes em ensaios multi-ambientais através de um teste F e implementar uma rotina computacional para a realização da análise de dados segundo o teste proposto. O estudo avalia quatro conjuntos de dados, cada um com diferentes números de genótipos dentro de ambientes com quatro blocos. Para um dos conjuntos, simulou-se as somas de quadrados das linhas (genótipos) e colunas (ambientes) da matriz de interação genótipos X ambientes (GE) gerando 500, 5000 e 10000 experimentos para verificar a distribuição empírica. Os resultados indicaram um ajuste à distribuição qui-quadrado não-central para as linhas e colunas da matriz de interação GE, verificados também pelo teste de Kolmogorov-Smirnov e o gráfico QQplot. Na aplicação do teste F proposto aos quatro conjuntos de dados, identificou-se os genótipos e ambientes que contribuiram mais para a interação genótipos X ambientes. Dessa forma, os melhoristas podem selecionar bons genótipos e ambientes nos seus estudos.; The objective of the present work was to propose a method for testing the con- tribution of each element in a genotypes X environments interaction using multi-environment analyses by means of an F test and implementation of a computational routine to analyze the data according to the test proposed. The study evaluated four data sets...

Link permanente para citações:

## Genetic parameters for milk yield analyzed by test-day models in Murrah buffaloes in Brazil

Fonte: Pagepress Publ
Publicador: Pagepress Publ

Tipo: Artigo de Revista Científica
Formato: 179-182

ENG

Relevância na Pesquisa

45.69%

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); New statistical models for genetic parameters estimation based on longitudinal data have been proposed. In this study, we considered the data of 47,614 test-day milk yields from 1,578 buffaloes, with 4,757 complete lactations, calving from 1985 to 2006. Single- ,two-and multiple trait analyses were used and variance components were estimated by Restricted Maximum Likelihood. The model used to evaluate the milk yield trait at 305 days (MY305) included: i) herd-year-calving season (contemporary group) and milking number as fixed effects; ii) buffalo age at calving as covariate (linear and quadratic effect); iii) additive genetic, permanent environmental, residual and the animal as random effects. The same effects were included in the test-day milk yield model except the contemporary group, defined as herd-year-test day. The heritability estimations for TDMY vary from 0.13 to 0.23 for single-trait analyses, from 0.13 to 0.24 for two-trait analyses and from 0.15 to 0.24 for the multiple-trait analyses. The results obtained for each of the three models showed that the higher heritability estimations were always obtained in the third test month. The genetic correlations between the TDMY and MY305 were high and positive. In conclusion...

Link permanente para citações:

## Spectral F-Test power evaluation in the EEG during intermittent photic stimulaton

Fonte: Academia Brasileira de Neurologia - ABNEURO
Publicador: Academia Brasileira de Neurologia - ABNEURO

Tipo: Artigo de Revista Científica
Formato: text/html

Publicado em 01/06/2006
EN

Relevância na Pesquisa

75.69%

Intermittent photic stimulation (IPS) is an important functional test, which can induce the photic driving in the electroencephalogram (EEG). It is capable of enhancing latent oscillations manifestations not present in the resting EEG. However, for adequate quantitative evaluation of the photic driving, these changes should be assessed on a statistical basis. With this aim, the sampling distribution of spectral F test was investigated. On this basis, confidence limits of the SFT-estimate could be obtained for different practical situations, in which the signal-to-noise ratio and the number of epochs used in the estimation may vary. The technique was applied to the EEG of 10 normal subjects during IPS, and allowed detecting responses not only at the fundamental IPS frequency but also at higher harmonics. It also permitted to assess the strength of the photic driving responses and to compare them in different derivations and in different subjects.

Link permanente para citações:

## Accuracy test for in-vitro micro-computed tomography

Fonte: Springer; Germany
Publicador: Springer; Germany

Tipo: Conference paper

Publicado em //2009
EN

Relevância na Pesquisa

45.69%

The present work aims to describe and discuss the application of an accuracy test for in-vitro micro-computed tomography (microCT). Accuracy of morphometric measures is required to the analysis of bone microstructure and the mechanical characterization of the tissue. The accuracy test was introduced in a program of quality control designed for trabecular bone morphometry. It was applied using a physical calibration phantom that reproduced the three-dimensional structure of the typically investigated object, i.e. trabecular bone structure. The phantom was used to test the quality of accuracy measurements. The absolute error was chosen as the quality control parameter in accuracy test. The Shewhart control chart was introduced to monitor the quality control parameter. Baseline value was calculated as reference value for the control chart during acceptance/status test. An out of control condition was defined as the monthly measure that was out of the tolerance limits determined by the adopted chart. A maintenance service has been suggested upon the occurrence of this condition. During the monitoring period of 15-months no out of control conditions in accuracy test were recorded, as confirmed by the statistical C and Kruskal Wallis tests. Thus...

Link permanente para citações:

## Statistical evaluation of a novel SSVEP-BCI stimulation setup based on depth-of-field

Fonte: Sociedade Brasileira de Engenharia Biomédica
Publicador: Sociedade Brasileira de Engenharia Biomédica

Tipo: Artigo de Revista Científica
Formato: text/html

Publicado em 01/01/2015
EN

Relevância na Pesquisa

65.7%

#Brain-computer interface#Steady-state visual evoked potential#Depth-of-field#Objective response detection#Statistical F-test

AbstractIntroductionThe main drawback of a Brain-computer Interface based on Steady-State Visual Evoked Potential (SSVEP-BCI) that detects the emergence of visual evoked potentials (VEP) in reaction to flickering stimuli is its muscular dependence due to users must redirect their gaze to put the target stimulus in their field of view. In this work, a novel setup is evaluated in which two stimuli are placed together in the center of users' field of view, but with dissimilar distances from them, so that the target selection is performed by focus shifting instead of head, neck and/or eyeball movements.MethodsA model of VEP generation for the novel setup was developed. The Spectral F-test based on Bartett periodogram was used to evaluate the null hypothesis of absence of effects of the non-focused stimulus (NFS) within the VEP elicited by the focused stimulus (FS). To reinforce that there is not statistical evidence to support the presence of NFS effects, the PSDA detection method was employed to find the frequency of FS. Electroencephalographic signals of nine subjects were recorded.ResultsApproximately in 80% of the tests, the null hypothesis with 5% level of significance was non-rejected at the fundamental frequency of NFS. The average of the accuracy rate attained with PSDA detection method was 79.4%.ConclusionResults of this work become further evident to state that if the focused stimulus (FS) will be able to elicit distinguishable VEP pattern regardless the non-focused stimulus (NFS) is also present.

Link permanente para citações:

## Detection of movement intention using EEG in a human-robot interaction environment

Fonte: Sociedade Brasileira de Engenharia Biomédica
Publicador: Sociedade Brasileira de Engenharia Biomédica

Tipo: Artigo de Revista Científica
Formato: text/html

Publicado em 01/01/2015
EN

Relevância na Pesquisa

55.6%

#Movement intention#Objective response detection#Statistical F test#Event-related desynchronization#Brain-machine interface

Introduction: This paper presents a detection method for upper limb movement intention as part of a brain-machine interface using EEG signals, whose final goal is to assist disabled or vulnerable people with activities of daily living. Methods EEG signals were recorded from six naïve healthy volunteers while performing a motor task. Every volunteer remained in an acoustically isolated recording room. The robot was placed in front of the volunteers such that it seemed to be a mirror of their right arm, emulating a Brain Machine Interface environment. The volunteers were seated in an armchair throughout the experiment, outside the reaching area of the robot to guarantee safety. Three conditions are studied: observation, execution, and imagery of right arm’s flexion and extension movements paced by an anthropomorphic manipulator robot. The detector of movement intention uses the spectral F test for discrimination of conditions and uses as feature the desynchronization patterns found on the volunteers. Using a detector provides an objective method to acknowledge for the occurrence of movement intention. Results When using four realizations of the task, detection rates ranging from 53 to 97% were found in five of the volunteers when the movement was executed...

Link permanente para citações:

## A Simple Statistical Mechanical Approach for Studying Multilayer Adsorption of Interacting Polyatomics

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 30/10/2008

Relevância na Pesquisa

45.66%

A simple statistical mechanical approach for studying multilayer adsorption
of interacting polyatomic adsorbates (k-mers) has been presented. The new
theoretical framework has been developed on a generalization in the spirit of
the lattice-gas model and the classical Bragg-Williams (BWA) and quasi-chemical
(QCA) approximations. The derivation of the equilibrium equations allows the
extension of the well-known Brunauer-Emmet-Teller (BET) isotherm to more
complex systems. The formalism reproduces the classical theory for monomers,
leads to the exact statistical thermodynamics of interacting k-mers adsorbed in
one dimension, and provides a close approximation for two-dimensional systems
accounting multisite occupancy and lateral interactions in the first layer.
Comparisons between analytical data and Monte Carlo simulations were performed
in order to test the validity of the theoretical model. The study showed that:
(i) the resulting thermodynamic description obtained from QCA is significantly
better than that obtained from BWA and still mathematically handable; (ii) for
non-interacting k-mers, the BET equation leads to an underestimate of the true
monolayer volume; (iii) attractive lateral interactions compensate the effect
of the multisite occupancy and the monolayer volume predicted by BET equation
agrees very well with the corresponding true value; and (iv) repulsive
couplings between the admolecules hamper the formation of the monolayer and the
BET results are not good (even worse than those obtained in the non-interacting
case).; Comment: 38 pages...

Link permanente para citações:

## Inverse Statistical Mechanics: Probing the Limitations of Isotropic Pair Potentials to Produce Ground-State Structural Extremes

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 05/03/2014

Relevância na Pesquisa

45.59%

Inverse statistical-mechanical methods have recently been employed to design
optimized short-ranged radial (isotropic) pair potentials that robustly produce
novel targeted classical ground-state many-particle configurations. The target
structures considered in those studies were low-coordinated crystals with a
high degree of symmetry. In this paper, we further test the fundamental
limitations of radial pair potentials by targeting crystal structures with
appreciably less symmetry, including those in which the particles have
different local structural environments. These challenging target
configurations demanded that we modify previous inverse optimization
techniques. Using this modified optimization technique, we have designed
short-ranged radial pair potentials that stabilize the two-dimensional kagome
crystal, the rectangular kagome crystal, and rectangular lattices, as well as
the three-dimensional structure of CaF$_2$ crystal inhabited by a single
particle species. We verify our results by cooling liquid configurations to
absolute zero temperature via simulated annealing and ensuring that such states
have stable phonon spectra. Except for the rectangular kagome structure, all of
the target structures can be stabilized with monotonic repulsive potentials.
Our work demonstrates that single-component systems with short-ranged radial
pair potentials can counterintuitively self-assemble into crystal ground states
with low symmetry and different local structural environments. Finally...

Link permanente para citações:

## Thermodynamical Test of Non Extensive Thermostatistics

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 17/05/2001

Relevância na Pesquisa

45.62%

An ideal mixture of parahydrogen (with nuclear spin K=0) and orthohydrogen
(with K=1), in statistical weights 1/4 and 3/4, respectively, is used as a test
ground for the existence of non-extensivity in chemical physics. We report on a
new bound on the non extensivity parameter q - 1 that characterizes generalized
thermostatistics a la Tsallis. This bound is obtained on the basis of
laboratory measurements of the specific heat of hydrogen. Suggestions are
advanced for the performance of improved measurements.; Comment: 4 pages, 1 figure

Link permanente para citações:

## Quantal distribution functions in non-extensive statistics and an early universe test revisited

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 07/04/1999

Relevância na Pesquisa

45.55%

Within the context of non-extensive thermostatistics, we use the
factorization approximation to study a recently proposed early universe test. A
very restrictive bound upon the non-extensive parameter is presented: $|q-1| <
4.01 \times 10^{-3}$.; Comment: 4 pages, prl revtex style, no figures. To appear in Physica A, 1999

Link permanente para citações:

## Statistical mechanics models for multimode lasers and random lasers

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 23/09/2015

Relevância na Pesquisa

45.62%

#Physics - Optics#Condensed Matter - Disordered Systems and Neural Networks#Condensed Matter - Statistical Mechanics#78-06

We review recent statistical mechanical approaches to multimode laser theory.
The theory has proved very effective to describe standard lasers. We refer of
the mean field theory for passive mode locking and developments based on Monte
Carlo simulations and cavity method to study the role of the frequency matching
condition. The status for a complete theory of multimode lasing in open and
disordered cavities is discussed and the derivation of the general statistical
models in this framework is presented. When light is propagating in a
disordered medium, the system can be analyzed via the replica method. For high
degrees of disorder and nonlinearity, a glassy behavior is expected at the
lasing threshold, providing a suggestive link between glasses and photonics. We
describe in details the results for the general Hamiltonian model in mean field
approximation and mention an available test for replica symmetry breaking from
intensity spectra measurements. Finally, we summary some perspectives still
opened for such approaches.; Comment: 16 pages, 7 figures

Link permanente para citações:

## Statistical mechanics and the description of the early universe I.: Foundations for a slightly non-extensive cosmology

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 04/05/2001

Relevância na Pesquisa

45.59%

We analyze how the thermal history of the universe is influenced by the
statistical description, assuming a deviation from the usual Bose-Einstein,
Fermi-Dirac and Boltzmann-Gibbs distribution functions. These deviations
represent the possible appearance of non-extensive effects related with the
existence of long range forces, memory effects, or evolution in fractal or
multi-fractal space. In the early universe, it is usually assumed that the
distribution functions are the standard ones. Then, considering the evolution
in a larger theoretical framework will allow to test this assumption and to
place limits to the range of its validity. The corrections obtained will change
with temperature, and consequently, the bounds on the possible amount of
non-extensivity will also change with time. We generalize results which can be
used in other contexts as well, as the Boltzmann equation and the Saha law, and
provide an estimate on how known cosmological bounds on the masses of neutrinos
are modified by a change in the statistics. We particularly analyze here the
recombination epoch, making explicit use of the chemical potentials involved in
order to attain the necessary corrections. All these results constitute the
basic tools needed for placing bounds on the amount of non-extensivity that
could be present at different eras and will be later used to study primordial
nucleosynthesis.; Comment: 32 pages...

Link permanente para citações:

## Rigorous statistical detection and characterization of a deviation from the Gutenberg-Richter distribution above magnitude 8 in subduction zones

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 30/01/2002

Relevância na Pesquisa

45.62%

We present a quantitative statistical test for the presence of a crossover c0
in the Gutenberg-Richter distribution of earthquake seismic moments, separating
the usual power law regime for seismic moments less than c0 from another faster
decaying regime beyond c0. Our method is based on the transformation of the
ordered sample of seismic moments into a series with uniform distribution under
condition of no crossover. The bootstrap method allows us to estimate the
statistical significance of the null hypothesis H0 of an absence of crossover
(c0=infinity). When H0 is rejected, we estimate the crossover c0 using two
different competing models for the second regime beyond c0 and the bootstrap
method. For the catalog obtained by aggregating 14 subduction zones of the
Circum Pacific Seismic Belt, our estimate of the crossover point is log(c0)
=28.14 +- 0.40 (c0 in dyne-cm), corresponding to a crossover magnitude mW=8.1
+- 0.3. For separate subduction zones, the corresponding estimates are much
more uncertain, so that the null hypothesis of an identical crossover for all
subduction zones cannot be rejected. Such a large value of the crossover
magnitude makes it difficult to associate it directly with a seismogenic
thickness as proposed by many different authors in the past. Our measure of c0
may substantiate the concept that the localization of strong shear deformation
could propagate significantly in the lower crust and upper mantle...

Link permanente para citações:

## On the failure of the volume function in granular statistical mechanics and an alternative formulation

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Relevância na Pesquisa

45.59%

We first show that the currently accepted statistical mechanics for granular
matter is flawed. The reason is that it is based on the volume function, which
depends only on a minute fraction of all the structural degrees of freedom and
is unaffected by most of the configurational microstates. Consequently, the
commonly used partition function underestimates the entropy severely. Secondly,
we propose a new formulation, replacing the volume function with a connectivity
function that depends on all the structural degrees of freedom and accounts
correctly for the entire entropy. We discuss the advantages of the new
formalism and derive explicit results for two- and three-dimensional systems.
We test the formalism by calculating the entropy of an experimental
two-dimensional system, as a function of system size, and showing that it is an
extensive variable.; Comment: 5 pages, 3 figures

Link permanente para citações:

## The coverage probabililty of confidence intervals in regression after a preliminary F test

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 11/03/2010

Relevância na Pesquisa

45.69%

Consider a linear regression model with regression parameter
beta=(beta_1,..., beta_p) and independent normal errors. Suppose the parameter
of interest is theta = a^T beta, where a is specified. Define the s-dimensional
parameter vector tau = C^T beta - t, where C and t are specified. Suppose that
we carry out a preliminary F test of the null hypothesis H_0: tau = 0 against
the alternative hypothesis H_1: tau not equal to 0. It is common statistical
practice to then construct a confidence interval for theta with nominal
coverage 1-alpha, using the same data, based on the assumption that the
selected model had been given to us a priori(as the true model). We call this
the naive 1-alpha confidence interval for theta. This assumption is false and
it may lead to this confidence interval having minimum coverage probability far
below 1-alpha, making it completely inadequate. Our aim is to compute this
minimum coverage probability. It is straightforward to find an expression for
the coverage probability of this confidence interval that is a multiple
integral of dimension s+1. However, we derive a new elegant and
computationally-convenient formula for this coverage probability. For s=2 this
formula is a sum of a triple and a double integral and for all s>2 this formula
is a sum of a quadruple and a double integral. This makes it easy to compute
the minimum coverage probability of the naive confidence interval...

Link permanente para citações:

## Hiding solutions in random satisfiability problems: A statistical mechanics approach

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Relevância na Pesquisa

45.59%

#Condensed Matter - Disordered Systems and Neural Networks#Condensed Matter - Statistical Mechanics#Computer Science - Computational Complexity

A major problem in evaluating stochastic local search algorithms for
NP-complete problems is the need for a systematic generation of hard test
instances having previously known properties of the optimal solutions. On the
basis of statistical mechanics results, we propose random generators of hard
and satisfiable instances for the 3-satisfiability problem (3SAT). The design
of the hardest problem instances is based on the existence of a first order
ferromagnetic phase transition and the glassy nature of excited states. The
analytical predictions are corroborated by numerical results obtained from
complete as well as stochastic local algorithms.; Comment: 5 pages, 4 figures, revised version to app. in PRL

Link permanente para citações:

## Experimental test of curvature-driven dynamics in the phase ordering of a two dimensional liquid crystal

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 09/06/2008

Relevância na Pesquisa

45.58%

We study electric field driven deracemization in an achiral liquid crystal
through the formation and coarsening of chiral domains. It is proposed that
deracemization in this system is a curvature-driven process. We test this
prediction using the exact result for the distribution of hull-enclosed areas
in two-dimensional coarsening in non-conserved scalar order parameter dynamics
recently obtained [J.J. Arenzon et al., Phys. Rev. Lett. 98, 061116 (2007)].
The experimental data are in very good agreement with the theory. We thus
demonstrate that deracemization in such bent-core liquid crystals belongs to
the Allen-Cahn universality class, and that the exact formula, which gives us
the statistics of domain sizes during coarsening, can also be used as a strict
test for this dynamic universality class.; Comment: 4 pages, 4 figures

Link permanente para citações:

## $1/f^\alpha$ noise and integrable systems

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 14/05/2009

Relevância na Pesquisa

45.65%

#Nonlinear Sciences - Chaotic Dynamics#Condensed Matter - Statistical Mechanics#Mathematical Physics

An innovative test for detecting quantum chaos based on the analysis of the
spectral fluctuations regarded as a time series has been recently proposed.
According to this test, the fluctuations of a fully chaotic system should
exhibit 1/f noise, whereas for an integrable system this noise should obey the
1/f^2 power law. In this letter, we show that there is a family of well-known
integrable systems, namely spin chains of Haldane-Shastry type, whose spectral
fluctuations decay instead as 1/f^4. We present a simple theoretical
justification of this fact, and propose an alternative characterization of
quantum chaos versus integrability formulated directly in terms of the power
spectrum of the spacings of the unfolded spectrum.; Comment: 5 pages, 3 figures, RevTeX

Link permanente para citações:

## Utilization of the Brazilian test for estimating the uniaxial compressive strength and shear strength parameters

Fonte: Journal of the Southern African Institute of Mining and Metallurgy
Publicador: Journal of the Southern African Institute of Mining and Metallurgy

Tipo: Artigo de Revista Científica
Formato: text/html

Publicado em 01/03/2015
EN

Relevância na Pesquisa

45.58%

#Brazilian test#shear strength parameters#triaxial compressive strength#uniaxial compressive strength#Mohr-Coulomb criterion

Uniaxial compressive strength (UCS) and shear strength parameters (cohesion and angle of internal friction, C and ϕ) of rocks are important parameters needed for various engineering projects such as tunnelling and slope stability. However, direct determination of these parameters is difficult and requires high-quality core samples for tests. Therefore, this study aimed to explore the applicability of the Brazilian test (BT) - a simple, less sophisticated and inexpensive method for both specimen preparation and testing - to estimate the UCS and shear strength parameters of rocks. Thirty-seven rock types were sampled and tested, 24 of which were volcanic, 8 were metamorphic, and 5 were sedimentary. Statistical equations were derived to estimate the UCS and shear strength parameters of rocks using the BT. The validity of the statistically derived equations was confirmed using predictive analytics software (PASW Statistics 18). A strong linear relation was found between BT and UCS values. BT and UCS values exhibited prominent linear correlations with the cohesion values of rocks. The Mohr envelope was also used to determine the cohesion and friction angle of rocks using BT and UCS values. It is deduced from the current study that the BT values can be used to estimate the UCS and cohesion. However...

Link permanente para citações: