Distribution of some elements in Veronica scutellata L. from Bolu,Turkey: soil-plant interactions

Veronica scutellata L. occurs in moist and wet habitats, such as ponds, marshes and other wetlands. This study was conducted on this species to examine its mineral element uptake status in terms of interactions between soil and plant. Experimental materials were taken from the Southern coast of Black Sea at coordinates 40º36’N and 31º16’E at an altitude of 1400 m above sea level from Bolu – Turkey; using standard methods and plant (root, stem and leaf parts) and soil mineral element measurements (Al, B, Ca, Cu, Fe, K, Mg, Mn, Na, Ni and Zn) were done. During the study, ICP-OES was employed for the measurement of mineral elements. It was observed that considerable amounts of B, Ca, K, Mg, Mn, Na and Zn are accumulated by the plant

Maxwell effect in polymer solutions for high velocity gradients

Binomial asymptotics of the angle of orientation and birefringence (b.r.) in solutions of rigid rod-shaped polymeric macromolecules has been found at high velocity gradients. The conditions of applicability of the asymptotic formulae obtained and the possibility of using them for determining the size of the macromolecules have been established. The use of the results to determine the size of the collagen molecule is demonstrated. The result well agrees with those given in the literature

The Maxwell effect for polymer solutions at larger velocity gradients

The orientation angle and birefringence were found to run asymptotically in the case of rigid, anisotropic particle solutions (macromolecules) at larger flow gradients (the model examined is that of a two-dimensional flow of particles). The applicability of the produced formulae and the possibilities of using them to determine the particle dimensions have been established. The formulae indicate a monotony of the theoretical curves between the angle of orientation and the birefringence at larger flow gradients. The found analytical expressions are compared with the results of computing the orientation angle. © 1981

Characters expression in rubber tree and obtainment of clones with production and resistance to south american leaf blight

Em termos gerais, este trabalho apresenta metodologia de pesquisa com seringueira (Hevea spp.), visando a obtenção de clones produtivos e com resistência permanente ao fungo Microcyclus ulei. Mostra, também, aspectos relacionados com a influência de genes maiores na expressão de caracteres e suas relações com o ataque de praga e doença, bem como o nível atual de conhecimentos da interação hospedeiro x patógeno x ambiente no referente ao mal-das-folhas da seringueira.In general terms, this report shows a research methodology with rubber tree (Heavea spp) for obtainment of produtive clones with permanent resistance to fungi Microcyclus ulei. It also shows aspects in relation to major influence of genes in characters and their relations with attack of pest and disease and atual level of knowledgement of host x guest x environment interaction in relation to the rubber tree South American Leaf Blight

Sum of Lyapunov exponents of the Hodge bundle with respect to the Teichmuller geodesic flow

We compute the sum of the positive Lyapunov exponents of the Hodge bundle with respect to the Teichmuller geodesic flow. The computation is based on the analytic Riemann-Roch Theorem and uses a comparison of determinants of flat and hyperbolic Laplacians when the underlying Riemann surface degenerates.Comment: Minor corrections. To appear in Publications mathematiques de l'IHE

Development Of Al-B-C Master Alloy Under External Fields

This study investigates the application of external fields in the development of an Al-B-C alloy, with the aim of synthesizing in situ Al3BC particles. A combination of ultrasonic cavitation and distributive mixing was applied for uniform dispersion of insoluble graphite particles in the Al melt, improving their wettability and its subsequent incorporation into the Al matrix. Lower operating temperatures facilitated the reduction in the amount of large clusters of reaction phases, with Al3BC being identified as the main phase in XRD analysis. The distribution of Al3BC particles was quantitatively evaluated. Grain refinement experiments reveal that Al-B-C alloy can act as a master alloy for Al-4Cu and AZ91D alloys, with average grain size reduction around 50% each at 1wt%Al-1.5B-2C additions

Numerical simulation system for parallel computing

Abstract. Mathematic modeling is used in many field

Sonoprocessing of materials (Special issue)

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