目的研究某炮弹底塞最佳表面防护工艺。方法采用霉菌试验方法,对2种底塞材料多种表面处理与防护工艺样品的防霉性和防腐蚀性能进行试验和优选。结果分析了防霉性和防腐蚀性能优劣的原因,评定出了最优的材料和表面处理与防护工艺组合,提...目的研究某炮弹底塞最佳表面防护工艺。方法采用霉菌试验方法,对2种底塞材料多种表面处理与防护工艺样品的防霉性和防腐蚀性能进行试验和优选。结果分析了防霉性和防腐蚀性能优劣的原因,评定出了最优的材料和表面处理与防护工艺组合,提出了炮弹长贮防霉和防腐蚀的建议和措施。结论底塞最佳的材料和表面处理与防护工艺组合为30Cr Mn Si A+镀锌/镀锌镍合金+涂7258号航空润滑油脂。展开更多
Measurements of dielectric parameters followed by permeability tests are performed on soil samples of infiltration basin. The dielectric parameters are obtained by TDR （time domain reflectrometry） measurements from ...Measurements of dielectric parameters followed by permeability tests are performed on soil samples of infiltration basin. The dielectric parameters are obtained by TDR （time domain reflectrometry） measurements from which it is found that the measurement of the permittivity, the electrical conductivity and the relaxation time of compacted soil allows the mapping of the values of the coefficient of permeability at the surface of an infiltration basin. With the distribution of the coefficient of permeability, the areas of water stagnation can be detected before the basin filling. The study proves that the TDR measurements for the detection of these zones can be used for the management of infiltration basins for sustainable working and their remediation can be undertaken before the rainy seasons.展开更多
Objective：There are a great number of modified models based on the four-vessel occlusion（4VO）model of Pulsinelli and Brierley which has been used worldwide for brain ischemia research.However,up to now the problems...Objective：There are a great number of modified models based on the four-vessel occlusion（4VO）model of Pulsinelli and Brierley which has been used worldwide for brain ischemia research.However,up to now the problems of collateral circulations of 4VO and the difficulty in arranging a surgery to occlude the basilar artery in other models are not satisfactorily solved yet.In this study,an improved 4-vessel occlusion（I4VO）rat model which is easy to handle and able to decrease the effect of collateral circulation is reported.Methods：The common carotid arteries and the beginning of the subclavical arteries of rats were occluded for different time by one-stage apertura thoracis superior approach.Neurological deficit scores defined by the modified Garcia scoring system and histopathological method were used to evaluate the effects of this model up to 7 days after reperfusion.Results：The neurological scores in the 15-min and 25-min groups decreased significantly at 24,48 and 72 hours after reperfusion（P〈0.05）,and the histopathologic study showed that there were stable,symmetrical changes of lesions in bilateral hippocampus in all the ischemia samples from two ischemia groups compared with sham operated group（P〈0.05）.Conclusion：This modified model is safe,easy,reliable,stable,mini-invasive as well as time-saving in making bilateral hemispheric ischemia,which can effectively decrease collateral circulations and meanwhile lead to stable lesions in hippocampus and cortex.展开更多
Background:Endoscopic cyanoacrylate(glue)injection of fundal varices may result in life-threatening embolic adverse events through spontaneous gastrorenal shunts(GRSs).Balloon-occluded retrograde transvenous occlusion...Background:Endoscopic cyanoacrylate(glue)injection of fundal varices may result in life-threatening embolic adverse events through spontaneous gastrorenal shunts(GRSs).Balloon-occluded retrograde transvenous occlusion(BRTOcc)of GRSs during cyanoacrylate injection may prevent serious systemic glue embolization through the shunt.This study aimed to evaluate the efficacy and safety of a combined endoscopic–interventional radiologic(BRTOcc)approach for the treatment of bleeding fundal varices.Methods:We retrospectively analysed the data of patients who underwent the combined procedure for acutely bleeding fundal varices between January 2010 and April 2018.Data were extracted for patient demographics,clinical and endoscopic findings,technical details,and adverse events of the endoscopic–BRTOcc approach and patient outcomes.Results:We identified 30 patients(13[43.3%]women;median age 58[range,25–92]years)with gastroesophageal varices type 2(53.3%,16/30)and isolated gastric varices type 1(46.7%,14/30)per Sarin classification,and median clinical and endoscopic follow-up of 151(range,4–2,513)days and 98(range,3–2,373)days,respectively.The median volume of octylcyanoacrylate:Lipiodol injected was 7(range,4–22)mL.Procedure-related adverse events occurred in three(10.0%)patients,including transient fever,non-life-threatening pulmonary glue embolism,and an injection-site ulcer bleed.Complete gastric variceal obturation was achieved in 18 of 21 patients(85.7%)at endoscopic follow-up.Delayed variceal rebleeding was confirmed in one patient(3.3%)and suspected in two patients(6.7%).Although no procedure-related deaths occurred,the overall mortality rate was 46.7%,primarily from liver-disease progression and co-morbidities.Conclusion:The combined endoscopic–BRTOcc procedure is a relatively safe and effective technique for bleeding fundal varices,with a high rate of variceal obturation and a low rate of serious adverse events.展开更多
文摘目的研究某炮弹底塞最佳表面防护工艺。方法采用霉菌试验方法,对2种底塞材料多种表面处理与防护工艺样品的防霉性和防腐蚀性能进行试验和优选。结果分析了防霉性和防腐蚀性能优劣的原因,评定出了最优的材料和表面处理与防护工艺组合,提出了炮弹长贮防霉和防腐蚀的建议和措施。结论底塞最佳的材料和表面处理与防护工艺组合为30Cr Mn Si A+镀锌/镀锌镍合金+涂7258号航空润滑油脂。
文摘Measurements of dielectric parameters followed by permeability tests are performed on soil samples of infiltration basin. The dielectric parameters are obtained by TDR （time domain reflectrometry） measurements from which it is found that the measurement of the permittivity, the electrical conductivity and the relaxation time of compacted soil allows the mapping of the values of the coefficient of permeability at the surface of an infiltration basin. With the distribution of the coefficient of permeability, the areas of water stagnation can be detected before the basin filling. The study proves that the TDR measurements for the detection of these zones can be used for the management of infiltration basins for sustainable working and their remediation can be undertaken before the rainy seasons.
文摘Objective：There are a great number of modified models based on the four-vessel occlusion（4VO）model of Pulsinelli and Brierley which has been used worldwide for brain ischemia research.However,up to now the problems of collateral circulations of 4VO and the difficulty in arranging a surgery to occlude the basilar artery in other models are not satisfactorily solved yet.In this study,an improved 4-vessel occlusion（I4VO）rat model which is easy to handle and able to decrease the effect of collateral circulation is reported.Methods：The common carotid arteries and the beginning of the subclavical arteries of rats were occluded for different time by one-stage apertura thoracis superior approach.Neurological deficit scores defined by the modified Garcia scoring system and histopathological method were used to evaluate the effects of this model up to 7 days after reperfusion.Results：The neurological scores in the 15-min and 25-min groups decreased significantly at 24,48 and 72 hours after reperfusion（P〈0.05）,and the histopathologic study showed that there were stable,symmetrical changes of lesions in bilateral hippocampus in all the ischemia samples from two ischemia groups compared with sham operated group（P〈0.05）.Conclusion：This modified model is safe,easy,reliable,stable,mini-invasive as well as time-saving in making bilateral hemispheric ischemia,which can effectively decrease collateral circulations and meanwhile lead to stable lesions in hippocampus and cortex.
文摘Background:Endoscopic cyanoacrylate(glue)injection of fundal varices may result in life-threatening embolic adverse events through spontaneous gastrorenal shunts(GRSs).Balloon-occluded retrograde transvenous occlusion(BRTOcc)of GRSs during cyanoacrylate injection may prevent serious systemic glue embolization through the shunt.This study aimed to evaluate the efficacy and safety of a combined endoscopic–interventional radiologic(BRTOcc)approach for the treatment of bleeding fundal varices.Methods:We retrospectively analysed the data of patients who underwent the combined procedure for acutely bleeding fundal varices between January 2010 and April 2018.Data were extracted for patient demographics,clinical and endoscopic findings,technical details,and adverse events of the endoscopic–BRTOcc approach and patient outcomes.Results:We identified 30 patients(13[43.3%]women;median age 58[range,25–92]years)with gastroesophageal varices type 2(53.3%,16/30)and isolated gastric varices type 1(46.7%,14/30)per Sarin classification,and median clinical and endoscopic follow-up of 151(range,4–2,513)days and 98(range,3–2,373)days,respectively.The median volume of octylcyanoacrylate:Lipiodol injected was 7(range,4–22)mL.Procedure-related adverse events occurred in three(10.0%)patients,including transient fever,non-life-threatening pulmonary glue embolism,and an injection-site ulcer bleed.Complete gastric variceal obturation was achieved in 18 of 21 patients(85.7%)at endoscopic follow-up.Delayed variceal rebleeding was confirmed in one patient(3.3%)and suspected in two patients(6.7%).Although no procedure-related deaths occurred,the overall mortality rate was 46.7%,primarily from liver-disease progression and co-morbidities.Conclusion:The combined endoscopic–BRTOcc procedure is a relatively safe and effective technique for bleeding fundal varices,with a high rate of variceal obturation and a low rate of serious adverse events.
