Influence Of Morphological Parameters Research Articles

Study on the influence of morphological parameters through the methodical procedures of strength development at the age of 14-15 years

Study on the influence of morphological parameters through the methodical procedures of strength development at the age of 14-15 years

Wind tunnel study on influences of morphological parameters on drag coefficient of horizontal non-uniform buildings

The implementation of morphometric evaluations of complex buildings in urban areas is essential for urban canopy models. There are two main reasons for this: the impossibility of conducting a micrometeorological evaluation of a building that is still in the design phase and the difficulty of estimating the roughness height of an urban area containing complex buildings using an anemometric method. This study used wind tunnel experiments to investigate the effects of the planar area, frontal area, shape, and layout of buildings on their aerodynamic characteristics. The results indicated that the curves showing the relationships between the buildings drag coefficient, Cd, and the four morphological parameters had similar patterns, with Cd=b·exp(−xca)·xd. The influences on Cd of both the shape and layout parameters showed peaks, as did the planar and frontal densities. A surface roughness model based on the morphometric evaluations of the aerodynamic parameters of non-uniform buildings was developed.

Spectral variability of the optical properties of pictorial layers

The spectral variability of reflectance properties of pictorial layers can be caused by chemical parameters, such as the nature of pigments and binders, or by morphological parameters, such as the pigment concentration, the thickness of the layer or the size distribution of pigments. This work proposes a study of the influence of morphological parameters on reflectance spectra using both hyperspectral measurements on physical samples and reflectance spectra calculated using an optical model based on the four-flux model. The spectral variability is evaluated by comparing the spectra to a reference spectrum, thanks to the Kullback–Leibler Pseudo-Divergence.

Морфологічні ознаки і фізико-механічні властивості насіння дрібнонасінних культур

To create a database and systematize the seeds of samples of small-seeded crops, it is necessary to determine the patterns of influence of morphological parameters on their physical and mechanical properties. The development of the latest technologies and technical devices for cleaning and separation is possible due to the understanding of the characteristic morphological parameters for each of the small-seeded crops. The aim of the research is to determine the physical and mechanical properties of the seed material of small-seeded crops (mustard, flax, ryegrass, rapeseed), necessary to increase the efficiency of their cleaning and separation processes. To achieve this goal, a plan of experimental research was developed, which provided for the determination of physical and mechanical parameters of seeds of small-seeded crops, namely: indicators that characterize the flowability of seeds (angle of natural bias); frictional properties of seeds (static coefficient of friction); porosity (density) and density; size and mass characteristics of seeds (length, width, thickness, effective diameter, weight of 1000 seeds). It is established that the physical and mechanical properties of seeds of small-seeded crops are greatly influenced by its humidity. With increasing humidity, the performance of the test material increases. This is due to the fact that with increasing humidity, the shape of the seed almost turns into a spherical, which, in turn, leads to an increase in the curvature of the surface and reduce the points of contact between the seeds. As a result, the angle of natural inclination increases. The coefficient of friction of seeds of small-seeded crops depends on the roughness of the friction surface and decreases with increasing humidity. This is due to the fact that with increasing humidity decreases the forces of molecular attraction of the seed coat to the surface of the material. Seed density increases with increasing humidity. From this we can conclude that the absorption of moisture by the investigated material increases the total weight of the seed, and as a result - increases its specific weight.

Application of seismic architecture interpretation in enhancing oil recovery in late development Stage——Taking meandering river reservoir in Dongying depression as an example

Taking typical meandering river deposits of Ng52+3 in the west 7th block of Gudong Oilfield as an example, the influence of point-bar-sandstone superposition structure on flooding law and remaining oil distribution is studied by means of seismic architecture interpretation under the guidance of point-bar geometry. Meanwhile, the influence of morphological parameters and lithology of lateral accretionary surfaces on remaining oil and development characteristics is discussed. The seismic waveform and amplitude of point-bar boundary sandstones are obvious when they overlap with each other. The connectivity of superimposed zones between boundary sandbodies of point-bars is poor. The remaining oil near the superimposed zones is enriched when base-of-channel sandstone that infills abandonment (PI) and the earliest sandstone at the beginning of migration of the point bars (PI) superimposed with each other. Remaining oil is relatively not enriched when PI sandstones of point-bars are superimposed in superimposed zone. Remaining oil is relatively enriched in the upper point-bar sandstone at the superimposed zone. The effective shielding area effective distance to obstruct fluid flow of mudstone section of lateral accretionary surfaces is 50–80 m along the lateral direction of lateral-accretion surfaces, and the remaining oil is not enriched in the same point bar within the range of 50–80 m around oil and water wells. The physical property section of lateral-accretion surfaces in the middle and lower part of the surfaces has a certain blocking effect on flow and can obviously reduce the recovery degree. Seismic architectural interpretation plays an important role in predicting remaining oil enriched areas and prolonging oil field life in order to improve oil recovery.

Differences in morphological parameters of judo athletes of different age groups and performance level

Background: Some studies have pointed out the influence of morphological parameters on judo performance, however the relationship between morphological variables and performance status have not yet been confirmed. In addition, there is a lack of studies focused on morphological comparison of different age categories. Objective: The aim of this study was to assess differences in the morphological parameters of judo athletes of different age and performance level. Methods: The research sample was composed of 47 male judokas (age 19.15 ± 2.93 years; body weight 77.16 ± 11.39 kg; height 178.91 ± 6.39 cm; sport age 11.47 ± 2.74 years). It was divided by: (1) age, into cadets (15-17 years, n = 19), juniors (18-20 years, n = 15), and seniors (21+ years, n = 13) category and (2) performance status (elite, n = 10; non-elite, n = 37). In all participants, body fat, and the circumference measurement of wrist, forearm, flexed arm, and calf were observed. A personal interview was used to gain information about the athlete's performance status. Results: We found out that there are significant differences in arm circumference between cadets and seniors, cadets and juniors, juniors and seniors; and in the circumference of forearm between cadets and seniors; cadets and juniors, as well. According to the performance status, we have discovered significantly higher circumference of forearm and wrist in the elite group compared to the non-elite group. Conclusion: Forearm and wrist circumference is a reliable discriminative factor and should be taken into consideration, especially when selecting judo athletes into elite teams. However, we did not confirm that subcutaneous fat is a parameter able to distinguish between judo athletes of different performance status across various age categories.

Influence of cement stiffness and bone morphology on the compressive properties of bone–cement composites in simulated vertebroplasty

Vertebroplasty is widely used to treat vertebral compression fractures. Little is known about the influence of morphological parameters of the bone on the properties of the bone-cement composite. Furthermore, although generic finite element (FE) models have been suggested as a way to compute the values of these properties, their accuracy has not been established. In the experimental part of this study, we tested bovine cancellous bone and three different polymethylmethacrylate bone cements and determined six quasi-static uniaxial compressive properties of bone-cement composite specimens and 10 morphological parameters of the bone. For the FE work, we used two simulations, one being μFE and the other unit cell FE. In conclusion, we found that (1) for composite specimens, that relative contribution of the cement to the overall response of the composite increases with increasing cement stiffness; (2) the anisotropy ratio is the bone morphological property that exerts the most significant influence on the experimentally obtained compressive properties of the bone-cement composites determined; (3) the accuracy of the computed compressive properties of the composites ranged from low to high, depending on simulation method used. The largest errors, however, can partially be explained by difference in boundary conditions between the experimental testing and the simulation techniques. The lattermost finding points to the potential for simplified FE models being incorporated into automatic material mapping schemes in whole bone vertebra FE simulations.

Effect of Stochastic Nanotube Waviness on the Elastic and Thermal Properties of Nanocomposites by Fiber Embedment in Finite Elements

In this paper the impact of entangled and non-straight fibers in the determination of the effective elastic and thermal properties of polymer nanocomposite (PNC) is addressed. Most of the models in recent studies assume nanotubes to be well dispersed straight fibers. Nonetheless, experiments reveal that nanotube formation become wavy during the manufacturing process, due to their high aspect ratio and low bending stiffness. In the paper an attempt to model the behavior of entangled fibers is made and the influence of morphological parameters is investigated. First, an approach to generate random microstructures is developed. Then, using an embedded fiber finite element (EFFE) approach, the effective properties are computed for each of the random microstructures. This approach requires only a regular grid for the finite element (FE) mesh, circumventing the requisite computationally costly and human labor intensive mesh refinement of ordinary FE in order to capture the local morphology of the composite material. The EFFE approach is used in conjunction with an appropriately modified Monte Carlo procedure to derive statistics of the computed effective physical properties; several of these numerical results are found in good agreement with related experimental data.

Fourier transform spectroscopy in remote sensing of solid planetary surfaces

Fourier transform spectrometers have been used to obtain infrared emission spectra of solid planetary surfaces in the mid- and thermal-infrared region. This range is suitable for determining the mineralogical composition of the different planetary objects because even the highest-frequency fundamentals of silicates and other minerals appear in this region. However, the analysis of the emission spectra of solid surfaces is considerably complicated by the influence of morphological parameters on spectral behaviour. The surfaces of most of the airless planetary objects are covered with a regolith blanket. Particle size, grain shape, particle size distribution, the degree of covering and porosity of this fine-grained material strongly influence the thermal throughput and the spectral behaviour in the infrared. Laboratory emittance spectra of particulate minerals show that the spectral contrast of the fundamental vibration bands decreases with decreasing particle size. In the spectra of mineral powders with small grain sizes, weak overtone and combination tone bands instead of the vanishing fundamentals become increasingly important for the identification of minerals. Therefore, in the past infrared spectroscopy has been used rather sparingly for remote sensing. The chances for composition analysis of solid surfaces are discussed in relation to instrumental requirements for Fourier spectroscopy during planetary missions. An FT-IR spectrometer with its throughput and multiplex advantage is proposed for the spectroscopic sounding of the planetary surfaces. Moreover, the rotating reflector interferometer (RRI) is especially well adapted for space missions. It uses two retroreflectors in full aperture, integrated into a rotational device. The retroreflectors move along a circular path for some degrees, tailored to give medium resolution (0.5–5 cm −1) typical for space missions. Moreover, the RRI is suitable for lightweight, rugged and compact construction, which has minimum sensitivity to vibrations and shocks.