Anodic synthesis of TiO2 nanotubes by step-up voltages

Fabrication of TiO2 nanotubes (NTs) has extensive application properties due to their high corrosion resistant and compatibility with biomedical applications, the synthesis of TiO2 nanotubes over titanium has drawn interest in various fields. The synthesis of TiO2 NTs using novel in-situ step-up voltage conditions in the electrochemical anodization process is recorded in this work. For manufacturing the NTs at 1 hour of anodization, the input potential of 30, 40 and 50 V was selected. With increasing step-up voltage during the anodization process, an improvement in the NTs was observed, favoring corrosion resistance properties. The surface of NTs enhances the structure of the ribs, raising the potential for feedback over time. XRD was used to analyze phase changes, and HR-SEM analyzed surface topography. Impedance tests found that longer NTs improved the corrosion resistance.

Farmer’s Individual Potential in Different Farm Sizes of Local Beef Cattle Farming in Kebumen Regency, Indonesia

This study aims (1) identify the farmer’s individual potential in different farm sizes and (2) analyze the relationship of basic potential, availability of man power potential, provision of production input potential, and technological mastery potential with the increasing farm size of PO Kebumen cattle. 100 respondents (breeding farmers) from 6 sub-districts known as PO Kebumen beef cattle development centers are selected using a multistage sampling method. The results of Kruskal Wallis Test explain that farmer’s individual potential of PO Kebumen beef cattle farming showed significant difference at different farm size (P<0.01). Based on the Spearman rank correlation test, the availability of technological potential and the provision of production input potential are considered as the important elements regarding to the increasing farm size of PO Kebumen beef cattle (P <0.01). The mastery of technology and the provision of production inputs are the driving factors for increasing the farm size of PO Kebumen cattle.

Action-space clustering of tidal streams to map the Galactic potential

Given a parametrized model of the Galactic potential, the best-fit parameters can be obtained by maximizing the Kullback-Leibler divergence of the action distribution of a set of stars initially clustered in action space (e.g. stars in tidal streams). This method will allow us to map the Milky Way's gravitational potential by simultaneously fitting multiple tidal streams without requiring stream membership information. With 20 streams of at least 20 stars each, including observational errors consistent with predictions for Gaia, this technique recovers the input potential parameters to a precision of 10-60% and an accuracy of 10%. With all the observed streams in our mock stellar halo (about 40) that fit the error criteria, the precision improves to 10%.

Radiation solution of the modified Korteweg–de Vries equation

An inverse scattering study of the radiation solution of the modified Korteweg–de Vries equation is carried out for a simple illustrative example. Specifically, extending the expansion approach (the reflection coefficient being expanded in powers of the area of the input potential) that we pioneered on the 3-wave interaction problem and recently applied to the study of sine-Gordon and sinh-Gordon dynamics, we obtain the complete spatial and temporal evolution of the modified KdV solution up to third order in the expansion. The solution and, in particular, its asymptotic (t → ∞) behaviour are discussed and a comparison is made with the asymptotic analysis of Ablowitz and Newell. The nonintegral contributions to the radiation solution are found to be in exact agreement as t → ∞ with Ablowitz and Newell's steepest descents approximation (evaluated for the same model) for the kernel of the Marchenko integral equation.

A hydrologic investigation of salt-affected soils in an alluvial plain of the Hawkesbury River, N.S.W

An alluvial plain had noticeable salinization of low-lying surface soils after a succession of wet years. Piezometric investigations showed that the water-table was permanent and of low hydraulic gradient. Salinity measurements provided the ground water pattern of salinity and the soil-salt distribution relative to water-table depth. The critical depth for the water-table associated with surface salinization was 3 ft. The influence of a neighbouring saline-water bearing sedimentary shale deposit is examined, and the probable source of salt in the alluvial plain soils is suggested. A possible method of controlling this salt, by control of the input potential of the watertable, is discussed.