Search

In - situ densification of the sprayed coating layer was realized by mixing large size shot peening particles into spray powder, which could improve not only the strength of the deposits but also the bonding strength of the deposited coatings with the substrate through the hammering effect of shot peening particles on deposited coatings. In this paper, recent development of the in - situ micro - forging assisted cold spraying technology was summarized. Firstly, the working principle of this technology was briefly introduced, and the influence of parameters such as shot peening volume fraction and particle size was discussed. Secondly, the evolution of the microstructure of the coating was discussed, including its effects on interparticle bonding quality, plastic deformation degree and subsequent heat treatment on the microstructure. Then, the mechanical properties and corrosion protection performance were summarized. Finally, some important issues which needed further investigations were pointed out.

Objective: To explore the difference in temperature recovery following cold stimulation between participants with and without diabetes mellitus (DM). Materials and Methods: The participants without (control group; n = 25) and with (DM group; n = 26) DM were subjected to local cold stimulation (10º C for 90 s). The thermal images of their hands were continuously captured using a thermal camera within 7 min following cold stimulation, and the highest temperature of each fingertip was calculated. According to the temperature values at different timepoints, the temperature recovery curves were drawn, and the baseline temperature (T‐base), initial temperature after cooling (T0), temperature decline amplitude (T‐range), and area under the temperature recovery curve > T0 (S) were calculated. Finally, symmetry differences between the two groups were analysed. Results: No statistical differences in the T‐base, T0, and T‐range were observed between the DM and control groups. After drawing the rewarming curve according to the temperature of the fingertips of the patients following cold stimulation, the S in the DM group was significantly lower than that in the control group (p < 0.05). Furthermore, the asymmetry of the base temperature of the hand was observed in the DM group. Conclusions: Following cold stimulation, the patients with DM exhibited a different rewarming pattern than those without DM. Thus, cold stimulation tests under infrared thermography may contribute to the early screening of diabetic peripheral neuropathy in future. [ABSTRACT FROM AUTHOR]

The prevalence of metabolic diseases, some diseases that are seriously harmful for human health and affect the quality of life, is increasing year by year. Early detection and intervention is the common strategy to deal with them. Infrared thermography (IRT) is a special medical imaging technology which can capture the changes of skin temperature associated with metabolic disorders. It might be a new method for early detection of metabolic diseases. The purpose of this review is to summarize advances of the use of IRT in evaluating single metabolic disorder such as obesity, hyperglycemia and hypertension, complex metabolic disorders such as metabolic syndrome and target organ damage such as coronary artery atherosclerosis and diabetic foot. The characteristic of thermograms of metabolic disease patients, the changes of thermal maps during the development of the disease, and the lacks in current studies are also discussed in the article. [ABSTRACT FROM AUTHOR]

Perovskite phase ferroelectric thin films Bi4-xSbxTi3O12 (Sb(x)-BIT) and pyrochlore crystal phase thin films Bi2-ySbyTi2O7 (Sb(y)-BTO) with different Sb concentration have been fabricated on Pt(111)/Ti/SiO2/Si(100) substrates through sol-gel method respectively. Test results show that the doping Sb can significantly reduce the leakage current of films. Especially when x = 0.04, y = 0.3 the leakage current characteristics of Sb(0.04)-BIT and Sb(0.3)-BTO both to achieve the optimal, and the ferroelectric properties Sb(0.04)-BIT are also improved. By the same means, constructed the Sb(0.04)-BIT/Sb(0.3)-BTO system with Sb(0.3)-BTO as buffer layer and Sb(0.04)-BIT as ferroelectric layer. The properties of BIT ferroelectric thin films are improved by the doping of Sb element and the addition of buffer layer. This is mainly reflected in that compared to pristine BIT the leakage current of Sb(0.04)-BIT/Sb(0.3)-BTO system decreases rapidly from the initial 8.8 × 10−4 A/cm2 to the current 7.2 × 10−10 A/cm2, the residual polarization 2Pr of the system increases sharply from 9.5 to 70.8 µC/cm2 and fatigue endurance up to more than 1010 switching cycles. [ABSTRACT FROM AUTHOR]

A complex dislocation network on the curved end face of the α precipitate in a Ti-8 wt.% Fe alloy was observed using transmission electron microscopy (TEM). The Burgers vectors of these dislocations were determined by g ⋅ b contrast analysis, and the planes of the dislocation loops made up of the dislocations were calculated according to a series of TEM images. The interfacial structure was well interpreted by a generalized O-element approach. The determination of the planes of the dislocation loops on the end face implies that the dislocation loops lie in irrational planes rather than slip planes. These experimental results provide useful data for further study of migration of the interface. [ABSTRACT FROM AUTHOR]

While the precipitation of α (hcp) from β (bcc) in various Ti alloys has been investigated in great detail, less is known about the precipitation of β from α. This study conducts a systematic investigation of structures and migrations of interfaces between β precipitates and α′ matrix in a Ti-2.6 wt% Mo alloy. Utilizing conventional and high-resolution transmission electron microscopy (TEM), assisted with molecular dynamics and generalized O-element analysis approaches, we unveil the dislocation and atomic structures of three typical portions of the interface surrounding a β precipitate, i.e., the habit plane, the side facet, and the end face. The habit plane of β precipitates contains two sets of dislocations with Burgers vectors b 1 = [ 2 1 ¯ 1 ¯ 3 ] α / 6 | [ 1 1 ¯ 1 ] β / 2 and b 4 = [ 2 1 ¯ 1 ¯ 3 ¯ ] α / 6 | [ 11 1 ¯ ] β / 2 , in contrast to the single set of b 1 dislocations previously found on the habit plane of α laths precipitated from β matrix in various Ti alloys. Interface migrations during shrinkage of β precipitates are characterized via in-situ TEM, showing that both the habit plane and side facet migrate through the lateral motion of nanometer-high growth ledges. The dislocation structures of various growth ledges were obtained through generalized O-element calculations, suggesting a potential non-conservative dislocation trajectory as semicoherent growth ledges sweep across the interface. [Display omitted] [ABSTRACT FROM AUTHOR]