Distribution of microplastic contamination in the major tributaries of the Yellow River on the Loess Plateau.

Microplastic pollution in rivers had gained increased attention worldwide. However, the differences in microplastic characteristics among major tributaries of large rivers and the environmental factors influencing these characteristics remain uncertain. Through field investigation and indoor experiments, the distribution of microplastics and their driving factors were investigated at 96 sampling sites along the three main tributaries (Huangfuchuan, Wuding and Yan River) of the Yellow River in the Loess Plateau.

Small-diameter polyurethane vascular graft with high strength and excellent compliance.

In this study, a polyurethane vascular graft with excellent strength and compliance for clinical application was designed and fabricated by preparing three small-diameter vascular graft layers via the textile techniques of wet spinning and knitting. The polyurethane filament that was fabricated by wet spinning formed the inner layer. The polyurethane tubular fabric was used as the middle layer.

Bioinspired Cellulose Foam with Excellent Water Wicking and Flux Properties Prepared Using Ice Template.

The application and functionalization of cellulose has been attracting increased attention in academic and industrial studies because of its wide range of sources, short renewable cycle, and low environmental impact. In order to enhance the application field of cellulose and decrease the environmental pollution for organic solvent associated with its preparation, cellulose foam with a vertically hierarchically porous structure similar to wood was designed and fabricated successfully from a cellulose aqueous solution using an ice templated in this study. The cellulose foam prepared using a 3 wt % concentration possessed a uniform vertical hierarchically porous structure, which could provide a pathway for the flow of water or air based on the capillary effect.

Risk factors for early-onset seizures after stroke: A systematicreview and meta-analysis of 18 observational studies.

Objectives: To systematically evaluate the risk factors of early-onset seizures after stroke, in order to better provide evidence-based results for early detection, identification, targeted prevention, and treatment of this disease.

Methods: PubMed, EMBASE, The Cochrane Library, CNKI, and WanFang databases were searched to collect relevant studies on the risk factors of early-onset seizures after stroke from January 2010 to January 2020. Meta-analysis of all included studies was performed by using RevMan version 5.

Three-Dimensional Wood-Inspired Bilayer Membrane Device Containing Microchannels for Highly Efficient Solar Steam Generation.

A three-dimensional solar steam generation device with a high water evaporation rate and excellent structural stability was developed and characterized. The design consisted of a bilayer membrane composed of polyacrylonitrile (PAN) and PAN/graphene oxide (GO) segments and contained vertically aligned porous structures similar to that of wood. This distinctive design was used to improve the water evaporation rate by increasing the light absorption and specific surface area.

Effect of temperature on the thermal property and crystallization behavior of poly (lactic acid) porous membrane prepared via phase separation induced by water microdroplets.

Poly (lactic acid) (PLA)-based porous membrane were fabricated through phase separation induced by water microdroplets at different ambient temperature to unravel the relationship between the physical properties (including thermal properties and crystallization) and preparation temperature. Cross-sectional scanning electron micrographs revealed that the thickness of the membrane decreases with increasing temperature between 25 °C and 100 °C. In the bilayer structure, each layer has a different morphology.