Controlling process parameters of lost foam casting （LFC） enables this process to produce defect-free complex shape castings. An experimental investigation on lost foam casting of an A1-Si-Cu cast alloy was carried ...Controlling process parameters of lost foam casting （LFC） enables this process to produce defect-free complex shape castings. An experimental investigation on lost foam casting of an A1-Si-Cu cast alloy was carried out. The effects of pouting temperature, slurry viscosity, vibration time and sand size on surface finish, shrinkage porosity and eutectic silicon spacing of thin-wall casting were investigated. A full two-level factorial design of experimental technique was used to identify the significant manufacturing factors affecting the properties of casting. Pouring temperature was found as the most significant factor affecting A1-Si-Cu lost foam casting quality. It was shown that flask vibration time interacted with pouring temperature influenced euteetic silicon spacing and porosity percentage significantly. The results also revealed that the surface quality of the samples cast in fine sand moulds at higher pouring temperatures was almost unchanged, while those cast in coarse sand moulds possessed lower surface qualities. Furthermore, variation in slurry viscosity showed no significant effect on the evaluated properties compared to other parameters.展开更多
近年来，损伤控制骨科（damage control ortho-pedics，DCO）理论与技术在严重创伤救治中的合理应用，取得了较好效果，也越来越受到重视。随着高能量创伤事故的不断增加，面对多发伤合并复杂骨折的患者，如何有效地提高患者的生存率，...近年来，损伤控制骨科（damage control ortho-pedics，DCO）理论与技术在严重创伤救治中的合理应用，取得了较好效果，也越来越受到重视。随着高能量创伤事故的不断增加，面对多发伤合并复杂骨折的患者，如何有效地提高患者的生存率，改善远期疗效，已成为创伤骨科面临的一个重要的课题。本文就DCO临床应用的进展综述如下。展开更多
Boiling processing is commonly used in post-harvest handling of White Paeony Root （WPR）, in order to whiten the herbal materials and preserve the bright color, since such WPR is empirically considered to possess a h...Boiling processing is commonly used in post-harvest handling of White Paeony Root （WPR）, in order to whiten the herbal materials and preserve the bright color, since such WPR is empirically considered to possess a higher quality. The present study was designed to investigate whether and how the boiling processing affects overall quality of WPR. First, an ultra-high performance liquid chromatography quadrupole/time-of-flight mass spectrometry-based metabolomics approach coupled with multivariate statistical analysis was developed to compare the holistic quality of boiled and un-boiled WPR samples. Second, ten major components in WPR samples boiled for different durations were quantitatively determined using high performance liquid chromatography to further explore the effects of boiling time on the holistic quality of WPR, meanwhile the appearance of the processed herbal materials was observed. The results suggested that the boiling processing conspicuously affected the holistic quality of WPR by simultaneously and inconsistently altering the chemical compositions and that short-time boiling processing between 2 and 10 rain could both make the WPR bright-colored and improve tile contents of major bioactive components, which were not achieved either without boiling or with prolonged boiling. In conclusion, short-term boiling （2-10 min） is recommended for post-harvest handling of WPR.展开更多
基金the Ministry of Higher Education of Malaysia (MOHE) for the financial support under the vote GUP-Q.J130000.2501.04H18
文摘Controlling process parameters of lost foam casting （LFC） enables this process to produce defect-free complex shape castings. An experimental investigation on lost foam casting of an A1-Si-Cu cast alloy was carried out. The effects of pouting temperature, slurry viscosity, vibration time and sand size on surface finish, shrinkage porosity and eutectic silicon spacing of thin-wall casting were investigated. A full two-level factorial design of experimental technique was used to identify the significant manufacturing factors affecting the properties of casting. Pouring temperature was found as the most significant factor affecting A1-Si-Cu lost foam casting quality. It was shown that flask vibration time interacted with pouring temperature influenced euteetic silicon spacing and porosity percentage significantly. The results also revealed that the surface quality of the samples cast in fine sand moulds at higher pouring temperatures was almost unchanged, while those cast in coarse sand moulds possessed lower surface qualities. Furthermore, variation in slurry viscosity showed no significant effect on the evaluated properties compared to other parameters.
文摘近年来，损伤控制骨科（damage control ortho-pedics，DCO）理论与技术在严重创伤救治中的合理应用，取得了较好效果，也越来越受到重视。随着高能量创伤事故的不断增加，面对多发伤合并复杂骨折的患者，如何有效地提高患者的生存率，改善远期疗效，已成为创伤骨科面临的一个重要的课题。本文就DCO临床应用的进展综述如下。
基金supported by a special fund of China State Administration of Traditional Chinese Medicine(No.201307008-2)National High Technology Research and Development Plan of China(863 Plain)(No.2014AA022204)+1 种基金Jiangsu Province Six Talent Project(YY-007)Jiangsu Branch of China Academy of Chinese Medical Science(No.JSBN1301)
文摘Boiling processing is commonly used in post-harvest handling of White Paeony Root （WPR）, in order to whiten the herbal materials and preserve the bright color, since such WPR is empirically considered to possess a higher quality. The present study was designed to investigate whether and how the boiling processing affects overall quality of WPR. First, an ultra-high performance liquid chromatography quadrupole/time-of-flight mass spectrometry-based metabolomics approach coupled with multivariate statistical analysis was developed to compare the holistic quality of boiled and un-boiled WPR samples. Second, ten major components in WPR samples boiled for different durations were quantitatively determined using high performance liquid chromatography to further explore the effects of boiling time on the holistic quality of WPR, meanwhile the appearance of the processed herbal materials was observed. The results suggested that the boiling processing conspicuously affected the holistic quality of WPR by simultaneously and inconsistently altering the chemical compositions and that short-time boiling processing between 2 and 10 rain could both make the WPR bright-colored and improve tile contents of major bioactive components, which were not achieved either without boiling or with prolonged boiling. In conclusion, short-term boiling （2-10 min） is recommended for post-harvest handling of WPR.
