There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1（PfPMP1）与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员，通过启动转录不同的var基因变异体为抗原变异提供了分子基础。

疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A

Surface composites by friction stir processing: A review

Corrosion behavior of an equiatomic CoCrFeMnNi high-entropy alloy compared with 304 stainless steel in sulfuric acid solution

Friction stir welding/processing of metals and alloys: A comprehensive review on microstructural evolution

Circumventing Strength-Ductility Paradox in High Entropy Alloys through Deformation Processing

Nonallograft Complications of Lung Transplantation.

Structured aluminium surfaces with tunable wettability fabricated by a green approach

Lotus-inspired superhydrophobic surfaces are highly sought owing to exquisite properties such as de-wetting, self-cleaning, anti-corrosion, anti-fouling. However, their use is limited due to low durability, high processing cost, and scalability issues. In the present work, we used low cost and simple flame spraying for developing self-regenerative superhydrophobic metallic coatings with high durability and corrosion resistance. The aluminum coatings were developed on low-carbon steel at optimized parameters, followed by annealing at different temperatures. The developed coating showed hierarchical structure with nanoscale features superimposed on microscale lamellae. The nano-sponge like morphology obtained through flame spraying after annealing transformed into nano-spheroid with reduced microscale porosity. The fabricated aluminum coatings inherently exhibited superhydrophilicity, which transformed to superhydrophobicity after silanization. The coatings exhibited advancing angles >150° and receding angles >148° with a 5° sliding angle. The change in morphology with annealing showed a significant influence on wettability, adhesion, and electrochemical corrosion. The contact angles decreased slightly with annealing temperature while still in the superhydrophobic regime. The adhesion of the coatings with the water droplet increased from ~2 μN to 7.3 μN with the increase in annealing temperatures while still being less than that of the lotus leaf (18 μN). The electrochemical corrosion resistance of the coatings showed significant improvement after annealing, which is related to the change in microporosity and formation of stable oxides as verified by x-ray photoelectron spectroscopy (XPS). The current density decreased from 0.48 μA/cm2 to 0.06 μA/cm2 due to stable passive layer formation. The coatings showed increased durability against abrasion, and impacting droplets due to improved inter-lamellar cohesion and increased adhesion with the substrate. The present work provide a low cost and facile solution for the development of superhydrophobic coatings for various applications. 

Harpreet Singh Grewal

Papers

Circumventing Strength-Ductility Paradox in High Entropy Alloys through Deformation Processing

Nonallograft Complications of Lung Transplantation.

Structured aluminium surfaces with tunable wettability fabricated by a green approach

Self-regenerative superhydrophobic metallic coatings with enhanced durability

Excellent Corrosion Resistance of Dual-Phase Bimodal Stainless Steel