Advanced Materials Research Vols. 887-888

Abstract: The corrosion characteristics of grounding grid in different kinds of resistance-reducing agent were analyzed. The corrosion characteristic of carbon steel in different resistance-reducing agent was presented. Comprehensive evaluation on construction technology was made. Moreover, reference for the protection of the grounding grid and the safe operation were provided.

Abstract: Kinetic parameters are calculated based on the reactive temperature rise curve measured by adiabatic approach at the temperature of 145 to 160 °C with the catalytic system of NaOH and acyl caprolactam End-capped butadiene-acrylonitrile rubber (CHTBN) or styrene-butadiene rubber (CHTBS). The reaction order is first order, the activation energy is between 72.91−73.16 kJ∙mol⁻¹ and the pre-exponential factor is between 3.22×10¹¹− 3.38×10¹¹ mol¹⁻ⁿ∙s⁻¹ in the system of CHTBN/NaOH. While in CHTBS/NaOH, the reaction order is between 1.23-1.34, the activation energy is between 85.55－86.88 kJ∙mol⁻¹ and the pre-exponential factor is between 4.52×10¹¹−5.0 9×10¹¹ mol¹⁻ⁿ∙s⁻¹. The adiabatic reaction kinetic model of caprolactam anion was constructed based on the existing research findings, by which the polymerizing reaction is simulated. The coincidence between the simulation results and the experimental data revealed that the model is reasonable and correct.

Abstract: Kinetic parameters were calculated based on the catalytic reaction systems of sodium caprolactam salt、N-75 biuret and at the temperature of 145 to 160 °C. The reaction order was approximately first order. The activation energy was between 73.2−77.1 kJ∙mol⁻¹ and the pre-exponential factor was between 2.9×10¹¹−3.6×10¹¹ mol¹⁻ⁿ∙s⁻¹. The calculated reaction heat of 134.5−137.3 J∙g⁻¹ was in consonance with the literature value of 138.6 J∙g⁻¹. The adiabatic reaction kinetic model of caprolactam anion was constructed based on the existing research findings. The coincidence between the simulation results and the experimental data revealed that the model was reasonable and correct.

Abstract: By making use of the φ-mapping topological current theory and the decomposition of gauge potential theory, we investigate the skyrmion excitations of (2+1)-dimensional graphene. It is shown that the topological numbers are Hopf indices and Brower degrees. Based on the bifurcation theory of the φ-mapping theory, it is founded that the skyrmions can be generated or annihilated at the limit point (the generation and annihilation of skyrmion-antiskyrmion pairs).

Abstract: The ab inttio density functional theory had been used to calculate the vacancy formation energy of C in the vanadium carbide, to reveal the effects of super-cell size and parameters k points. It turned out that,the calculation model of C vacancy formation energy in VC should be contain 64 atoms, while the K grid meshed 5x5x5 above using the Monkhorst-Pack method. And due to the vacancy formation energy of C 6.76eV, the high vacancy concentration of VC could be caused by simple thermal vibration. These researches not only had a certain value to know VC properties, but also had great significance to rediscover the forming of vacancy.

Abstract: The analytical solution to a cylindrical inclusion with an eccentric crack impacted incident SH waves was studied by using the methods of Green function and conjunction. Firstly, Green function was constructed, which was an essentical solution of displacement field for an elastic half space containing a half cylindrical inclusion while bearing out-of-plane harmonic line source force at any point of its horizontal boundary. Secondly, the whole space was divided into two parts via conjunction technology, a series of unknown forces were loaded at the linking sections to satisfy continuity conditions.Thirdly, the Fredholm integral equations of the first kind were set up through the continuity conditions and the Green function. Finally, a example for dynamic stress intensity factor for mode III at the crack tip was given. Numerical results show that the dynamic stress intensity factors is influenced by wave numbers and media parameters.

Abstract: The Dissolution of Synthetic Pyromorphite was Studied at 25°C in a Series of Batch Experiments. in Addition, the Aqueous Concentrations from the Batch Dissolution were Used to Calculate the Solubility Product and Free Energy of Formation of Pyromorphite. the Results of the Fourier Transform Infrared Spectroscopy Analyses Indicated that the Synthetic, Microcrystalline Pyromorphite with Apatite Structure Used in the Experiments has Not Changed after Dissolution. the Mean K_sp Value was Calculated for Pb₅(PO₄)₃Cl of 10^-78.31 at 25°C; the Free Energy of Formation ΔG_f⁰[Pb₅(PO₄)₃Cl] was-3756.82kJ/mol.

Abstract: Ion-exchange fibers are promising drug delivery carriers,so it is important to predict the loading efficiency and loading capacity in the loading process and accurate prediction and control of the drug release profile(s) from the fibers for a given fiber-drug system under precise loading conditions. Impact of initial drug concentration, drug solution volume and fiber dose on the drug loading process and effect of loading drug concentration drug solution volume, fiber dose on the drug releasing process were assessed experimentally and theoretically. Two mathematical models based on Donnan theory and ion exchange equilibrium theory taking into account the chemical partition coefficient of D⁺ , Na⁺ and Cl^- were developed to simulate the drug loading onto ion exchange fiber and releasing process respectively with the aim to gain mechanistic understanding on the factors affecting these two processes. Good correspondence between the experiment and theory has been established.

Abstract: Hydrogen generator (HHO generator) is a relatively simply device where the oxygen and hydrogen are produced via water electrolysis. Mostly, water solutions of NaOH or KOH are used instead of pure water due to higher electric conductivity of these solutions. In these measurements, current of 2 A was set for three hours and changes in voltage, temperature, efficiency and hourly volume performance were monitored. All measurements were realized with 10% KOH and 10% NaOH solutions and the results were compared and evaluated. KOH solution is considered as a best available one because of its high chemical stability and efficiency of HHO gas production and NaOH solution was selected due to its low price and good availability.

Abstract: A facile synthetic method that would be applied to polycondensation reaction between monomer A with bifunctional hydroxyl groups and monomer B with bifunctional reactive hydrogen atoms under Friedel-Crafts conditions was described. This approach, which has the advantage of short reaction time, high yield and simple synthesis operation, opens a way to prepare soluble high molecular weight polymers by the polycondensation reaction between monomer A with bifunctional hydroxyl groups and monomer B with bifunctional reactive hydrogen atoms under Friedel-Crafts conditions.