scholarly journals CARACTERIZAÇÃO MORFOMÉTRICA DA MICROBACIA HIDROGRÁFICA DO CÓRREGO DA FAZENDA GLÓRIA, MUNICÍPIO DE TAQUARITINGA, SP.

Irriga ◽  
2008 ◽  
Vol 13 (3) ◽  
pp. 310-322 ◽  
Author(s):  
Flávia Mazzer Rodrigues ◽  
Teresa Cristina Tarlé Pissara ◽  
Sérgio Campos
Keyword(s):  
Remote Sensing ◽  
Fourth Order ◽  
Land Development ◽  
Morphometric Characteristics ◽  
Third Order ◽  
First Order ◽  
The Relationship ◽  
Number Of Segments ◽  
Morphometric Characterization

Caracterização morfométrica da microbacia hidrográfica do córrego da Fazenda Glória, Município de Taquaritinga, SP.  Flavia Mazzer Rodrigues1; Teresa Cristina Tarlé Pissarra1; Sérgio Campos2 1Departamento de Engenharia Rural, Faculdade de Ciências Agronômicas e Veterinária, Universidade Estadual Paulista, Jaboticabal, SP, [email protected] de Engenharia Rural, Faculdade de Ciências Agronômicas, Universidade Estadual Paulista, Botucatu, SP   1 RESUMO  Com a análise das características morfométricas, procura-se entender a relação solo-superfície, em decorrência dos processos erosivos sobre estruturas e litologias variadas. Neste trabalho, objetivou-se caracterizar, no período de 1983 e 2000, as características morfométricas na Microbacia Hidrográfica do Córrego da Fazenda Glória, de 4a ordem de magnitude, Município de Taquaritinga - SP. Esta microbacia hidrográfica foi dividida em 7 microbacias hidrográficas de 2a ordem e 2 microbacias hidrográficas de 3a ordem. As características morfométricas demonstraram que ocorreu uma redução do número de segmentos de rios de 1.a ordem e comprimento da rede de drenagem ao longo do período analisado, estando relacionadas às diversas influências que a evolução do modelado sofreu, tendo em vista o uso e ocupação do solo, indicando comportamento hidrológico desigual. Os resultados permitiram inferir que o comprimento do segmento de rio de 4a ordem se manteve constante ao longo do período analisado. UNITERMOS: sensoriamento remoto, análise morfométrica, microbacias hidrográficas.  RODRIGUES, F. M.; PISSARRA, T. C. T.; CAMPOS, S. Morphometric characterization of Glória FARM Watershed, Taquaritinga, state of São Paulo, brazil.  2 ABSTRACT The analysis of morphometric characteristics is used to understand the relationship between soil and surface as a result of erosive processes on different structures and lithologies. The objective of this study was to study the morphometric characteristics of Fazenda Gloria watershed from 1983 to2000, afourth-order watershed in  TaquaritingaMunicipality,São PauloState. The study was based on photointerpretation techniques. Drainage net and the respective watersheds were selected and the morphometric variables were determined. The watersheds consisted of 7 second-order watersheds and 2 third-order watersheds. The morphometric characteristics showed a reduction in the number of segments of first-order rivers and in the length of the drainage net during the study period. These findings could be related to several influences on land development considering the occupation and use of land. A different hydrological behavior could also be observed. The analysis of Fazenda Glória Watershed showed that the length of the segment of fourth order river remained constant during the study period. KEY WORDS: remote sensing, morphometric analysis, watershed.

scholarly journals Numerical Characterization of Cohesive and Non-Cohesive ‘Sediments’ under Different Consolidation States Using 3D DEM Triaxial Experiments

Processes ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 1252
Author(s):  
Hadar Elyashiv ◽  
Revital Bookman ◽  
Lennart Siemann ◽  
Uri ten Brink ◽  
Katrin Huhn
Keyword(s):  
Mechanical Response ◽  
Burial Depth ◽  
Cohesive Sediments ◽  
Third Order ◽  
First Order ◽  
Numerical Characterization ◽  
Response To Stress ◽  
Bond Strengths ◽  
Individual Bond

The Discrete Element Method has been widely used to simulate geo-materials due to time and scale limitations met in the field and laboratories. While cohesionless geo-materials were the focus of many previous studies, the deformation of cohesive geo-materials in 3D remained poorly characterized. Here, we aimed to generate a range of numerical ‘sediments’, assess their mechanical response to stress and compare their response with laboratory tests, focusing on differences between the micro- and macro-material properties. We simulated two endmembers—clay (cohesive) and sand (cohesionless). The materials were tested in a 3D triaxial numerical setup, under different simulated burial stresses and consolidation states. Variations in particle contact or individual bond strengths generate first order influence on the stress–strain response, i.e., a different deformation style of the numerical sand or clay. Increased burial depth generates a second order influence, elevating peak shear strength. Loose and dense consolidation states generate a third order influence of the endmember level. The results replicate a range of sediment compositions, empirical behaviors and conditions. We propose a procedure to characterize sediments numerically. The numerical ‘sediments’ can be applied to simulate processes in sediments exhibiting variations in strength due to post-seismic consolidation, bioturbation or variations in sedimentation rates.

Incommensurately modulated structure of TaGe0.354Te2: application of crenel functions

1996 ◽  
Vol 52 (1) ◽  
pp. 100-109 ◽  
Author(s):  
F. Boucher ◽  
M. Evain ◽  
V. Petříček
Keyword(s):  
Detailed Analysis ◽  
Fourth Order ◽  
X Ray Diffraction ◽  
Third Order ◽  
Modulated Structure ◽  
X Ray ◽  
First Order ◽  
Germanium Telluride ◽  
Orthorhombic Cell ◽  
Orthogonalization Procedure

The incommensurately modulated structure of tantalum germanium telluride, TaGe0.354Te2, was determined by single-crystal X-ray diffraction. The dimensions of the basic orthorhombic cell are a = 6.4394 (5), b = 14.025 (2), c = 3.8456 (5) Å, V = 347.3 (1) Å3 and Z = 4. The (3 + 1)-dimensional superspace group is Pnma(00γ)s00, γ = 0.3544 (3). Refinements on 1641 reflections with I ≥ 3σ(I) converged to R = 0.065 and 0.044 for 526 main reflections and R = 0.061, 0.12, 0.28 and 0.32 for 782 first-order, 237 second-order, 37 third-order and 59 fourth-order satellites, respectively. Since the structure exhibits a strong occupational modulation of both Ta and Ge atoms, along with important displacive modulation waves, crenel functions were used in the refinement in combination with an orthogonalization procedure. Such an approach is shown to be the most convenient and to give reliable coordinations and distances. A detailed analysis of some Te...Te distances is performed, in connection with already known commensurately and incommensurately modulated MAx Te2 structures.

scholarly journals Morphometric Characteristics of the Conal Coronary Artery

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Ivan Stankovic ◽  
Milica Jesic
Keyword(s):  
Coronary Artery ◽  
Insufficient Evidence ◽  
Morphometric Characteristics ◽  
Surgical Revascularization ◽  
The Third ◽  
Per Se ◽  
The Difference ◽  
The Right ◽  
Morphometric Characterization

The right conal (conus) artery either presents as the first ventricular branch of the right coronary artery (RCA) or arises directly from the aorta, in which case, it is considered the third coronary artery (TCA). Morphometric characterization of this artery is important for interpretation of coronarography, surgical revascularization of myocardium and embryological interpretations. Eight out of 23 hearts presented the TCA (34.8%). The difference in the frequency of the TCA between the sexes was statistically insignificant (p>0.05). In all the specimens, the ostium of the TCA was to the left of and superior to the ostium of the RCA. The supernumerary (third) coronary artery formed Vieussens' arterial ring in 50% of the cases with the TCA, while the conal branch of the RCA formed the anastomosis with the conal branch at a higher frequency (63% of the cases). The ratio of external diameters of the RCA and TCA was 2.84 ±0.78, while the ratio of external diameters of the RCA and its conal branch was 2.61±0.74. The difference in the ratios was statistically insignificant (p>0.05). There were no findings indicating that the presence of the TCA could be detrimental or advantageous when compared to the classical coronary scheme (right and left coronary arteries originating from the aortic sinuses). Based solely on the TCA's morphological features, there is insufficient evidence to suggest that the presence of the TCA per se, is associated with a known clinical or disease state.

Development of the female flower and gynecandrous partial inflorescence of Myrica californica

1979 ◽  
Vol 57 (2) ◽  
pp. 141-151 ◽  
Author(s):  
Alastair D. Macdonald
Keyword(s):  
Fourth Order ◽  
Female Flower ◽  
Second Order ◽  
Third Order ◽  
First Order ◽  
Unique Structure ◽  
Inflorescence Axis ◽  
Definition Of ◽  
Fifth Order ◽  
Partial Inflorescence

Organogenesis of the female flower and gynecandrous partial inflorescence is described. Approximately 25 first-order inflorescence bracts are formed in an acropetal sequence. A second-order inflorescence axis, the partial inflorescence, develops in the axil of each bract. Third-, fourth-, and fifth-order axes arise in the axils of second-, third-, and fourth-order bracts. A gynoecium terminates a second-order axis and sometimes a distal third-order axis. A gynoecium consists of two stigmas and one basal, unitegmic, orthotropous ovule. The wall enclosing the ovule, the circumlocular wall, is comprised distally of gynoecial tissue and proximally of tissue of the inflorescence axis and its appendages. The latter portion of the wall is formed by zonal growth. Androecial members, formed proximal to the gynoecium on the partial inflorescence, are carried onto the circumlocular wall by zonal growth. A stamen may develop from the last-formed primordium before gynoecial inception or from a potentially stigmatic primordium. The papillae of the flower and fruit arise as emergences and from potentially bracteate, axial, and staminate primorida during the development of the circumlocular wall. The term circumlocular wall is used in a neutral sense to describe this unique structure. Since the gynoecium is composed of gynoecial appendages and inflorescence axis and appendages, a functional definition of gynoecium must be expanded to include any tissue, including an inflorescence, that surrounds the ovule(s) and forms the fruit(s).

scholarly journals Investigation on the Accuracy of Approximate Solutions Obtained by Perturbation Method for Galloping Equation of Iced Transmission Lines

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Xiaohui Liu ◽  
Shuguang Yang ◽  
Guangyun Min ◽  
Mengqi Cai ◽  
Chuan Wu ◽  
...  
Keyword(s):  
Perturbation Method ◽  
Fourth Order ◽  
Transmission Lines ◽  
Numerical Solutions ◽  
Averaging Method ◽  
Multiple Scales ◽  
Approximate Solutions ◽  
Third Order ◽  
Partial Differential ◽  
First Order

Perturbation method is a commonly used method to solve galloping equation of iced transmission lines, but few scholars have studied the influences of perturbation method on the accuracy of approximate solutions of the galloping equation. In order to analyze the accuracy of approximate solutions obtained by perturbation method for galloping equation of iced transmission lines, the partial differential galloping equation of iced transmission lines with quadratic and cubic nonlinear terms is obtained firstly. Then, the partial differential galloping equation is transformed into ordinary differential galloping equation by Galerkin method. Finally, the approximate solutions of the partial differential galloping equation are obtained by averaging method and first-order, second-order, third-order, and fourth-order multiple scales methods, and the results obtained by these methods are compared systematically. By comparing the numerical solutions and the approximate solutions obtained by averaging method, it can be found that, with the increasing in wind velocity and Young’s modulus of iced transmission lines, the nonlinearity of the system would strengthen and the drift of the vibration center of the system would also increase. The larger the drift is, the greater the error between the approximate solutions obtained by averaging method and the numerical solutions will be. And when the wind velocity reaches 32 m/s, the error would arrive at 17.321%. By comparing the numerical solutions and the approximate solutions obtained by the first-order, the second-order, the third-order, and the fourth-order multiple scales methods, it can be concluded that the first-order multiple scales method is less complex computationally. The accuracy of approximate solutions obtained by the fourth-order multiple scales method is better than that obtained by the first-order, the second-order, and the third-order multiple scales methods, and the error between the approximate solutions obtained by the fourth-order multiple scales method and the numerical solutions is less than 0.639%. The conclusions obtained in this paper would be helpful to the solutions of galloping equation of iced transmission lines and could also give some references to practical engineering.

Higher order rogue waves for the(3 + 1)-dimensional Jimbo–Miwa equation

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohammed K. Elboree
Keyword(s):  
Symbolic Computation ◽  
Fourth Order ◽  
Bilinear Form ◽  
Rogue Waves ◽  
Higher Order ◽  
Second Order ◽  
Third Order ◽  
First Order ◽  
Hirota Bilinear Form ◽  
Hirota Bilinear

Abstract Based on the Hirota bilinear form for the (3 + 1)-dimensional Jimbo–Miwa equation, we constructed the first-order, second-order, third-order and fourth-order rogue waves for this equation using the symbolic computation approach. Also some properties of the higher-order rogue waves and their interaction are explained by some figures via some special choices of the parameters.

Characterization of Deformable Objects by Using Dynamic Nonprehensile Manipulation

2013 ◽  
Vol 25 (1) ◽  
pp. 252-261
Author(s):  
Ixchel G. Ramirez-Alpizar ◽  
◽  
Mitsuru Higashimori ◽  
Makoto Kaneko
Keyword(s):  
Angular Velocity ◽  
Simulation Analysis ◽  
Mathematical Expression ◽  
Equation Of Motion ◽  
Angular Frequency ◽  
Deformable Objects ◽  
First Order ◽  
Nonprehensile Manipulation ◽  
The Relationship

This paper presents amethod for evaluating a physical parameter of unknown deformable objects, by using nonprehensile manipulation. By means of simulation analysis, we show that the curve representing the relationship between the object’s angular velocity and the plate’s frequency has a resonance-like response. Based on the above phenomenon, we utilize a Lorentz curve fitting to represent the object’s angular velocity as a function of the plate’s frequency with a simple mathematical expression, instead of deriving the equation of motion of the system that is rather complex due to the intricate dynamics of the system. Then, we show that the first order natural angular frequency in bending determines the frequency at which the object’s has its maximal angular velocity. Using this information, we present a method of how to estimate the object’s first order natural frequency in bending. We show the simulation and experimental results to verify the validity of the method presented.

scholarly journals Generalised Algebraic Continued Fractions related to Definite Integrals

1958 ◽  
Vol 9 (4) ◽  
pp. 170-182
Author(s):  
L. R. Shenton
Keyword(s):  
Recurrence Relation ◽  
Fourth Order ◽  
Continued Fractions ◽  
Recurrence Formula ◽  
Second Order ◽  
Third Order ◽  
First Order ◽  
Definite Integrals ◽  
Image Position ◽  
Remarkable Relation

The present paper is a continuation of the work initiated in [l]-[5]. In [5] I gave an expansion of the formfor the second order C.F. associated withwhere U8, V8, W8 satisfy a fourth-order recurrence relation, there being a similar expansion for third order C.F.'s. I shall now give simple expressions for U8, V8, W8 (or related forms) in terms of χ2s(Z1), χ2s (Z2), ω2s(Z1), ω2s(Z2), whereand show that there is a remarkable relation between the recurrence formula for the first order C.F. and that satisfied by U3, V3, W3. The generalised form of these results will be stated and proved.

scholarly journals Onset of Nonlinearity in the Elastic Bending of Blocks

2010 ◽  
Vol 77 (6) ◽  
Author(s):  
M. Destrade ◽  
M. D. Gilchrist ◽  
J. G. Murphy
Keyword(s):  
Nonlinear Elasticity ◽  
Fourth Order ◽  
Order Term ◽  
Maclaurin Series ◽  
Third Order ◽  
Bending Angle ◽  
First Order ◽  
The Moment ◽  
Incompressible Elasticity ◽  
Nonlinear Shear

The classical flexure problem of nonlinear incompressible elasticity is revisited assuming that the bending angle suffered by the block is specified instead of the usual applied moment. The general moment-bending angle relationship is then obtained and is shown to be dependent on only one nondimensional parameter: the product of the aspect ratio of the block and the bending angle. A Maclaurin series expansion in this parameter is then found. The first-order term is proportional to μ, the shear modulus of linear elasticity; the second-order term is identically zero because the moment is an odd function of the angle; and the third-order term is proportional to μ(4β−1), where β is the nonlinear shear coefficient, involving third-order and fourth-order elasticity constants. It follows that bending experiments provide an alternative way of estimating this coefficient and the results of one such experiment are presented. In passing, the coefficients of Rivlin’s expansion in exact nonlinear elasticity are connected to those of Landau in weakly (fourth-order) nonlinear elasticity.

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