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• Pore relative humidity (PRH) has a significant effect on salt swelling of sulfate saline soil. • Salt swelling displacement and salt swelling rate significant increase in high PRH (>90%). • Reducing PRH below the turning point effectively inhibits the salt swelling behavior. • The existence of turning point provides a new perspective for hindering salt swelling. Crystallization of sodium sulfate into mirabilite in sulfate saline soil harms the soil potential and intensifies the reparative expenses for subgrade. However, the effects of pore relative humidity (PRH) on the salt swelling behavior have not been thoroughly explored. The multiple-humidity cycles experiments, in this paper, were performed to investigate salt swelling behavior in sulfate saline soil. The effects of different salinity, temperatures, and PRH values on salt swelling displacement (SSD) and salt swelling rate (SSR) of sulfate saline soil were analyzed. The X-ray Diffraction (XRD) technique was employed to investigate the mineral composition of post-experiment soil samples. All test results show that the SSD and SSR of soil samples increase with the increase of PRH and salinity and decreases as the increasing temperature. The enhancement of salt swelling in the presence of PRH was 80-90-80%. Besides, XRD results denote that the existence of mirabilite in the test soil samples verified for the salt swelling to be closely related to PRH in terms of microstructure. All the results further improve the mechanism of salt swelling in sulfate saline soil in the presence of PRH, which is of great significance to analysis and remediation of salt swelling behavior. [ABSTRACT FROM AUTHOR]

Background and objective Minimally invasive and rapid recovery are trends in surgical treatment of lung cancer, and Da Vinci Surgical Robotic System plays an important role in them. This study was planned to explore the effect of chest wall external nursing interventions on reducing postoperative thoracic drainage and promoting rapid recovery of patients. Methods The patients who underwent robotic radical lung cancer resection in our hospital from November 2017 to April 2018were randomly divided into two groups. The control group received robotic radical lung cancer resection with abdominal bands wrapped around the chest. The experimental group underwent Da Vinci robotic radical lung cancer surgery and assisted chest wall external nursing interventions after surgery. Results The total and average daily drainage of the experimental group were less than those of the control group. Both the extubation time and the hospitalization time were shorter than those of the control group, but there was no significant difference. The pain score in the second days after operation of the experimental group was slightly higher than that of the control group, with no significant statistical difference. For patients whose chest wall thickness is less than 4 cm, mirabilite external application can significantly reduce the average daily and total drainage volume, but there is no significant difference in extubation time and hospitalization time. Conclusion Chest wall external nursing interventions are beneficial to the recovery of patients undergoing Vinci robotic lung cancer surgery. Especially for patients with thinner chest wall. It can reduce postoperative drainage, shorten tube retention time and accelerate discharge. Further improvement is expected to achieve better clinical results. [ABSTRACT FROM AUTHOR]

Phase-change energy storage technology is one of the remarkable energy storage technologies in recent years. This technology can effectively solve the mismatching contradiction of energy supply and demand in time and space. It can promote the optimisation of energy utilisation and improve the efficiency of energy utilisation. There are two technical problems in using mirabilite alone as phase change materials. One is the super-cooling phenomenon, and the other is the phase separation. This research used cooling curves, differential scanning calorimetry and other experimental methods. Heat storage characteristics of mirabilite were studied through a large number of experiments. Super-cooling phenomenon and phase separation of mirabilite have been verified by adding various additives. Proportion of additives was tested repeatedly. Super-cooling degree was reduced to <2°C. Phase transition occurs at 32°C or less to ensure its application in cooling water system of air conditioning. The decay rate of enthalpy attenuation got smaller after carrying out 20 times melt-freeze cycle. Properties of Na2SO4·10H2O phase change energy storage system are very suitable for application in cooling water system of air conditioning. [ABSTRACT FROM AUTHOR]

Magnesium hydroxide sulphate hydrate whiskers were prepared using raw ore of mirabilite associated with bloedite of Gaxiongnor in Inner Mongolia as raw material by one-step hydrothermal process without any additional template. X-ray powder diffraction was used to investigate the phase constitution of products. The morphology of products was examined by microscopy and scanning electron microscope analysis. Fourier infrared spectrum and thermogravimetry-differential scanning calorimetry were adopted to define functional groups and characterise their thermal behaviour of the products. The optimal preparation processing conditions were determined as: a molar ratio of magnesium sulphate and sodium hydroxide of 6, a temperature was 190°C, a reaction time of 5 hours and a magnesium sulphate concentration of 0·8 mol L−1. Magnesium hydroxide sulphate hydrate whiskers prepared under optimal processing condition result in a straight, fibrous structure with a size of 0·5-1·0 μm in diameter and 50-100 μm in length. [ABSTRACT FROM AUTHOR]