Objective To investigate the characteristics and prognostic factors in the elderly patients
with COVID-19. Methods Consecutive cases over 60 years old with COVID-19 in Renmin …

Extraction of analytes by the new porous polymer solid phase microextraction (SPME) fibres
is based on adsorption rather than absorption. The equilibrium theory developed for the …

Anatase TiO 2 nanocrystals (aTiO 2 ) of a uniform size have been synthesized and were
subject to a successive hydrogenation under a H 2 gas flow at elevated temperatures (500–700 …

Clustering by fast search and find of density peaks (DPC) is a new clustering method that
was reported in Science in June 2014. This clustering algorithm is based on the assumption …

Selfish mining attacks sabotage the blockchain systems by utilizing the vulnerabilities of
consensus mechanism. The attackers' main target is to obtain higher revenues compared with …

In this paper, we theoretically and experimentally demonstrate broadband metamaterial
absorbers that work in the mid-infrared regime. In the absorbers, two or four gold cross …

A novel continuous supermacroporous monolithic cryogel embedded with nanometer-size
particles was prepared by the radical cryogenic co-polymerization of acrylamide (AAm), N,N′…

In this article, the sensitivity and the noise of piezoresistive cantilevers were systematically
investigated with respect to the piezoresistor geometry, the piezoresistive materials, the …

Blockchain has been an emerging technology, which comprises lots of fields such as
distributed systems and Internet of Things (IoT). As is well known, blockchain is the underlying …

Transition metal oxides have drawn tremendous interest due to their unique physical and
chemical properties. As one of the most promising electrochromic (EC) materials, tungsten …