Advanced Materials Research
Vols. 479-481
Vols. 479-481
Advanced Materials Research
Vols. 476-478
Vols. 476-478
Advanced Materials Research
Vols. 472-475
Vols. 472-475
Advanced Materials Research
Vols. 468-471
Vols. 468-471
Advanced Materials Research
Vols. 466-467
Vols. 466-467
Advanced Materials Research
Vol. 465
Vol. 465
Advanced Materials Research
Vols. 463-464
Vols. 463-464
Advanced Materials Research
Vol. 462
Vol. 462
Advanced Materials Research
Vol. 461
Vol. 461
Advanced Materials Research
Vol. 460
Vol. 460
Advanced Materials Research
Vol. 459
Vol. 459
Advanced Materials Research
Vols. 457-458
Vols. 457-458
Advanced Materials Research
Vols. 455-456
Vols. 455-456
Advanced Materials Research Vols. 463-464
Paper Title Page
Abstract: The spring studies are very important for a lot of industry domains. We find the classical spring’s calculus in [2]. With the Transfer-Matrix Method, we can write the basic equations of the spring's theory with Dirac's and Heaviside's functions and operators and so we can calculate the six elements of the origin state vector. We have deducted the general expression for the Transfer-Matrix of a round spring, with an application for a spring embedded at its tow edges with uniform radial charge density. After, we can calculate, in all spring sections, the state vectors. We have studied a circular spring with a constant inertia and we have kept the sign conventions-as well as to the beams-for the internal efforts, for the displacements and for the exterior loads.
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Abstract: Chitosan was crosslinked using epichlorohydrin as crosslinking agent to prepare crosslinked chitosan which was used as an adsorbent for the removal of Zn(II) from aqueous solutions. The adsorption prosperities of Zn(II) on crosslinked chitosan were studied, including the influence of pH value and the adsorption kinetics. The kinetics of adsorption was discussed using two kinetic models, the pseudo first-order and the pseudo second-order model. Results reveal that the crosslinked chitosan is suitable as adsorbent to remove Zn(II) from dilute solution. The rate parameters for the Zn(II) by crosslinked chitosan were also determined. It was shown that the adsorption kinetics of Zn(II) could be best described by the pseudo second-order model and the adsorption process may involve a physical adsorption.
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Abstract: In geological disposal of radioactive wastes, the study of uranium migration is very important for the safety evaluation of the repository. The forms of chemical components of uranium presence in aqueous solution that directly affect its migration behavior provide a basis for analog computation of the element. This paper uses PHREEQC, the geochemical model, for analog computation of forms of uranium presence in two types of groundwater, and analyzes the morphologies of the main elements and the influencing factors. The results show that the morphology of uranium is mainly controlled by the characteristics of the chemical composition of groundwater, while the PH value also has a great impact on the forms of uranium presence.
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Abstract: This paper presents a study of the axially symmetric plates, charged with uniform load by Transfer-Matrix Method. The analytical calculus is based of the theory of Dirac’s and Heaviside’s functions and operators. That is an important possibility to result the circular plates, with the opportunity to program the calculus to obtain the eight elements of the exterior circumference state vector and for the interior circumference state vector of a tapping plate. After, we can calculate for all the values r0
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Abstract: More attention has been paid to the interfaces since mechanical properties of nickel-base superalloys are determined to some degree by them. The compositional transition across γ/γ′ interfaces and atomic structure of the interfaces was investigated using three-dimensional atom probe tomography and scanning transmission electron microscope equipped with high-resolution Energy Dispersive X-ray Spectrometry. Results show that no obvious segregation to the interfaces or ledges of the precipitates in the present experimental alloys has been observed. Also, adsorption of a solute to the interface was not observed. The interfaces are not flat as usually thought at an atomic scale. The interfacial thickness is about two atomic layers, i.e. 0.7 nm.
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Abstract: Pyrite is an ordinary mineral which appears in different types of deposits and it is an important gold-bearing mineral in gold deposits. Through studying the composition typomorphic characteristics of pyrite, we have achieved some genesis information. However, the study on pyrite composition typomorphism in different genesis gold deposits is rare. The paper studied major and trace elements of pyrite of different genetic deposits by using δFe—δS, δFe/δS—As, (Fe+S)—As and Co—Ni—As plot method and achieved major elements characteristics of different deposits. The results show that each genetic type gold deposit has its typical characteristics. This result are well applicable to genetic studies of pyrite in gold deposits and the distribution characteristics are helpful for studying pyrite in gold deposits
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Abstract: In this paper explicit finite element codes of LS DYNA are applied to simulate the crushing behavior of cylindrical metallic impact energy absorbers with annular machined grooves and the validation of the simulation results are done by comparing with experimental and theoretical findings from the literature. Some efforts are made to find the optimum groove geometry of the tubes by considering two criteria such as the maximum absorbed energy per unit mass (SEA) and maximum ratio of average load to maximum load during crushing (CFE). Maximum allowable load during crushing and the geometrical limits that should not exceed some specified boundaries are considered as design constrains. Based on design of experiment technique (DOE) the conditions that the results should be taken are determined and consequently, response surface (RS) models are created to build a composite objective function that considers both CFE and SEA. Genetic algorithm is applied to find the optimal point for the composite function that meets the design requirements.
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Abstract: Large-sized hydroxyapatite (HA) crystals with different morphologies, such as whisker-like, tubular and plate-form shape were prepared at different hydrothermal temperatures. Reaction solutions with small concentration of Ca2+, PO43- and OH- ions were used for HA synthesis. Phase identifications and morphological characterizations indicated that HA crystal grew along c axis under the modulation of glutamic acid adsorbent. The formation mechanism was explained according to the interfacial structures between glutamic acid and HA, as well as thermodynamic and kinetic considerations of crystal nucleation and growth. Understanding the evolution of crystal morphology in a specified reaction solution might favor to control the shape of crystals by the hydrothermal method.
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Abstract: The anelastic behavior of AA2024 alloy is studied in the temperature range between room temperature and 325 °C. The internal friction technique is shown to be very sensitive to the microstructural changes that take place at these temperatures. Interrupted aging performed at low temperature induces increase in the peak height at ~230 °C indicating the slow release of vacancies aiding the aggregation of Mg and Cu which further transforms into semicoherent precipitates. Stretched specimens indicate increase in background which is attributed to anelastic or viscoelastic of dislocations. TDIF of T6I4 samples is strongly affected to the point of deformation, whilst TDIF of T6I6 samples is affected by the deformation but irrespective to the point of deformation.
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