No abstract

in Wiley Online Library (wileyonlinelibrary.com).The layer-by-layer (LbL) assembly of polyelectrolyte multilayers on to a porous supporting membrane is able to create various new composite membranes. However, the low efficiency and long time required for such procedures limit practical applications. In this study, an automatic spray system has been constructed for the rapid assembly of polyelectrolyte multilayers on to nanoporous supporting membranes. The compounds polyacrylic acid and poly(ethyleneimine), used as a model polyelectrolyte pair, were alternately sprayed on to a polyacrylonitrile ultrafiltration membrane. Experiments proved that the composite membrane obtained in this way had a good pervaporation dehydration performance. In addition, the process times were dramatically decreased, by as much as 80 folds, when compared with classical dip-LbL methods. Such an automated system can easily be converted to the assembly of various organic species. Therefore, it is a versatile and highly efficient system for manufacturing composite multilayer membranes for many separation applications.(a) 0.25 wt % PEI aqueous solution (100Â). (b) 0.5 wt % PEI aqueous solution (100Â). (Preparative conditions for spray-LbL assembly: t 1 ¼ 3s, t 2 ¼ 3s, t 3 ¼ 3s, t 4 ¼ 27s, and t 5 ¼ 30 min; 0.025 wt % PAA aqueous solutions; 25 C).

The crude oil terminals often have large throughputs, and the fire risk of crude oil is high. Hence, the fire design standards are becoming more and more stringent, which makes it difficult for some old crude oil terminals to meet the relevant provisions of the new standards. In this study, we took a typical old crude oil terminal as an example, and utilize TNO software simulation to assessment the pool fire consequences. Several issues caused by the changes in the old and new standards are analyzed, such as the fireproof distance, explosion-proof and fireproof. Furthermore, we have put forward targeted solutions and treatment principles to help enterprise better deal with them.

The systematic statistical analysis of the basic causes is lacking in risk assessment of petrochemical port area. Based on the analyses sixty-seven tank safety accident cases, this pater summarizes the regulations for the formation and development of accidents. Targeted management systems are established, and then Tree Shape Logic Model is created.

During the Covid-19 global pandemic, exposure to cold cargo surfaces contaminated with Covid-19 was first identified as a potential cause of infection. Given that the epidemic situation in China is basically stable, epidemic prevention and control of cold chain cargo handling operations in Chinese ports is one of the key points for the country. It is concluded that the main risk link that may cause the spread of the epidemic is the unpacking of cold chain cargo containers by analyzing the process and characteristics of port cold chain cargo handling.In order to prevent imported epidemics from abroad, Chinese ports have taken countermeasures such as virus detection and sterilization. At present, nucleic acid detection measures have been adopted for the virus detection on the surface of goods, but the sampling quantity and method are lack of unified regulations, and the detection takes a long time. The mobile cabin PCR laboratories are used in some areas to improve the timeliness, and the virus detection on the surface of goods needs more sensitive and rapid detection technology. In the process of comprehensive preventive disinfection of goods, it was found that the disinfection efficiency of common disinfectants in low-temperature environment was greatly reduced, and a variety of new lowtemperature disinfectants were rapidly developed. The disinfection technology based on deep UV LED, UV catalysis, nuclear radiation and other physical technologies have brought a new revolution to the disinfection of the new coronavirus on the surface of low-temperature objects.Due to the global pandemic of novel coronavirus and its continuous variation, technical measures for epidemic prevention and control have developed rapidly. From the prevention and control experience of Chinese ports in combating the epidemic, epidemic prevention and control is a systematic project, which requires the combination of various technical measures and close cooperation of multiple links.