In order to better understand the thermodynamic properties of magnesium oxysulfate(MOS)cement,pure reagent was analyzed to prepare magnesium sulfide cement,non-isothermal kinetics calculation of the main hydration products was also carried out,and the conversion process of magnesium sulfide cement 517 phase at different temperatures was investigated.Composition of magnesium sulfide cement prepared was measured by XRD technique,and decomposed by a comprehensive thermal analyzer,and DSC curves of magnesium sulfide cement under different temperature rising rates were processed by Kinssinger method and Dolye-Ozawa method.According to the TG-DSC curves of magnesium sulfide cement,the thermal decomposition reaction process can be divided into five stages under normal conditions.The DSC curve was processed by Kinssinger method and Dolye-Ozawa method,and the kinetic analysis was carried out to calculate the 517 phase activation energy of magnesium sulfide cement.The three stages correspond to different activation energies.Therefore,flame retardant mechanism and thermal decomposition mechanism of magnesium sulfide cement based materials are deduced.
Transmesosigmoid hernia has previously been considered as a rare condition.The clinical symptoms can be nonspecific.Here,we report a case of acute intestinal obstruction because of transmesosigmoid hernia.In addition,after a comprehensive review of PubMed and China National Knowledge Infrastructure,we present a review of 22 cases of transmesosigmoid hernia.We summarize several valuable clinical features that help early recognition of transmesosigmoid hernia.As a result of easy strangulation,in patients without a history of surgery or abdominal inflammation who present with symptoms of progressive or persistent small bowel obstruction(SBO),surgeons should consider the possibility of transmesosigmoid hernia.In addition,based on our data,in patients with SBO because of transmesosigmoid hernia,the defect is usually 2-5 cm in diameter.Furthermore,because of the high risk of strangulation with transmesosigmoid hernia,it is mandatory to reassess the condition timely and periodically when patients receive conservative treatment.
Bin LiAkram AssafYun-Guo GongLian-Zhong FengXue-Yong ZhengChao-Neng Wu
