The work is dedicated to develop a one-step eco-friendly method to prepare antibacterial polyethylene terephthalate(PET).We report a one-step eco-friendly method to manufacture antibacterial PET via on-line amination ...The work is dedicated to develop a one-step eco-friendly method to prepare antibacterial polyethylene terephthalate(PET).We report a one-step eco-friendly method to manufacture antibacterial PET via on-line amination reaction by melt coextrusion.Beside evenly mixing of poly(hexamethylene guanidine)(PHMG)and PET in the melt coextrusion procedure,the amination reaction also occurred between PHMG and PET under high temperature(230-270℃).The antibacterial ability of composite PET showed obvious PHMG concentration dependence,and antibacterial activity reached more than 99%when PHMG content was 2.5 wt%.Moreover,LIVE/DEAD fluorescence test further confirmed that the composite PET could kill bacteria quickly and efiectively(within 30 min);while negligible cytotoxicity was observed to HSF and HUVEC cells.Onestep eco-friendly fabrication of composite antibacterial PET was accomplished by on-line melt coextrusion.The composite antibacterial PET has potential use in multiple fields to combat with pathogenic including textiles,packaging materials,decoration materials and biomedical devices,etc.展开更多
针对卫星网络动态环境下的高速信息传输、业务类型差异大等特点,提出一种综合考虑各业务QoS(Quality of Service)指标的可靠性分析方法。在卫星通信网络实际运行周期内,通信系统往往处于逐渐劣化过程中,导致卫星的节点和链路除正常工作...针对卫星网络动态环境下的高速信息传输、业务类型差异大等特点,提出一种综合考虑各业务QoS(Quality of Service)指标的可靠性分析方法。在卫星通信网络实际运行周期内,通信系统往往处于逐渐劣化过程中,导致卫星的节点和链路除正常工作和完全失效外,还存在部分失效的工作状态。本文在链路多状态基础上基于最小路集算法(Minimum Path Set Algorithms,MPSA)在不同业务的QoS指标(时延、带宽和丢包率)约束下,得出满足该业务QoS约束的所有可靠路径集,对路径集中路径进行不交化处理得到网络端-端可靠性。研究结果表明,不同业务由于QoS需求的差异导致网络端-端可靠性不同,所提算法与传统算法相比更加符合实际。由于实际卫星网络环境中会采用端-端并行多路径传输(Multi-Path Transmission,MTP),本文在上述研究的基础上,进一步对多路径的端-端可靠性进行了研究,结果表明多路径数据传输可靠性高。展开更多
目的探讨脑小血管病(cerebral small vascular disease,CSVD)患者血清血管内皮生长因子(vascular endothelial growth factor,VEGF)水平与脑白质高信号和非痴呆型认知功能障碍的相关性。方法纳入2019年4月至2020年12月连续就诊于新乡医...目的探讨脑小血管病(cerebral small vascular disease,CSVD)患者血清血管内皮生长因子(vascular endothelial growth factor,VEGF)水平与脑白质高信号和非痴呆型认知功能障碍的相关性。方法纳入2019年4月至2020年12月连续就诊于新乡医学院第一附属医院神经内科的106例CSVD患者为研究对象,依据简易智能评估量表(mini-mental state examination,MMSE)、蒙特利尔认知评估量表(Montreal cognitive assessment,MoCA)及日常生活活动能力量表(activity of daily living scale,ADL)将其分为非痴呆型血管性认知功能障碍(vascular cognitive impairment no dementia,VCIND)组(VCIND组,n=47)和无认知功能障碍(no vascular cognitive impairment,N-VCI组,n=59),采用酶联免疫吸附法检测两组患者血清VEGF水平,比较两组患者的基线资料、血清VEGF水平、MoCA评分及Fazekas评分,并分析血清VEGF水平与脑白质高信号、认知功能的相关性。采用SPSS 19.0软件进行数据处理,统计方法采用t检验、卡方检验、非参数检验、Logistic回归分析、Pearson相关分析和Spearman相关分析。结果两组患者血清VEGF水平[(464.18±114.58)pg/mL,(414.17±45.80)pg/mL,F=22.880]、MoCA评分[(13.07±6.48)分,(20.17±4.06)分,F=17.920]、Fazekas评分[4(3,5)分,3(1,3)分,Z=-4.189]均差异有统计学意义(均P<0.05)。VEGF水平(β=0.008,OR=1.008,95%CI=1.001~1.015,P<0.05)是CSVD患者认知功能的影响因素。VEGF水平与MoCA量表总分、注意力与计算力、定向力呈负相关(r=-0.345,-0.373,-0.445,均P<0.05),并且与Fazekas评分总分、脑室旁及深部白质Fazekas评分呈正相关(r=0.392,0.495,0.302,均P<0.05)。脑室旁和深部白质的白质高信号等级与VCIND存在线性趋势(均P<0.05)。结论在CSVD患者中血清VEGF水平与认知功能、脑白质高信号具有相关性,VEGF水平升高可能是反映认知功能障碍的因素。此外随着脑白质高信号等级的增加,CSVD患VCIND的风险升高。展开更多
基金Funded by the National Natural Science Foundation of China(No.51703169)Key Program of Science and Technology of Jieyang City(No.2019016)Key Research and Development Program of Shandong Province of China(No.2019JZZY010338)。
文摘The work is dedicated to develop a one-step eco-friendly method to prepare antibacterial polyethylene terephthalate(PET).We report a one-step eco-friendly method to manufacture antibacterial PET via on-line amination reaction by melt coextrusion.Beside evenly mixing of poly(hexamethylene guanidine)(PHMG)and PET in the melt coextrusion procedure,the amination reaction also occurred between PHMG and PET under high temperature(230-270℃).The antibacterial ability of composite PET showed obvious PHMG concentration dependence,and antibacterial activity reached more than 99%when PHMG content was 2.5 wt%.Moreover,LIVE/DEAD fluorescence test further confirmed that the composite PET could kill bacteria quickly and efiectively(within 30 min);while negligible cytotoxicity was observed to HSF and HUVEC cells.Onestep eco-friendly fabrication of composite antibacterial PET was accomplished by on-line melt coextrusion.The composite antibacterial PET has potential use in multiple fields to combat with pathogenic including textiles,packaging materials,decoration materials and biomedical devices,etc.
文摘针对卫星网络动态环境下的高速信息传输、业务类型差异大等特点,提出一种综合考虑各业务QoS(Quality of Service)指标的可靠性分析方法。在卫星通信网络实际运行周期内,通信系统往往处于逐渐劣化过程中,导致卫星的节点和链路除正常工作和完全失效外,还存在部分失效的工作状态。本文在链路多状态基础上基于最小路集算法(Minimum Path Set Algorithms,MPSA)在不同业务的QoS指标(时延、带宽和丢包率)约束下,得出满足该业务QoS约束的所有可靠路径集,对路径集中路径进行不交化处理得到网络端-端可靠性。研究结果表明,不同业务由于QoS需求的差异导致网络端-端可靠性不同,所提算法与传统算法相比更加符合实际。由于实际卫星网络环境中会采用端-端并行多路径传输(Multi-Path Transmission,MTP),本文在上述研究的基础上,进一步对多路径的端-端可靠性进行了研究,结果表明多路径数据传输可靠性高。
文摘目的探讨脑小血管病(cerebral small vascular disease,CSVD)患者血清血管内皮生长因子(vascular endothelial growth factor,VEGF)水平与脑白质高信号和非痴呆型认知功能障碍的相关性。方法纳入2019年4月至2020年12月连续就诊于新乡医学院第一附属医院神经内科的106例CSVD患者为研究对象,依据简易智能评估量表(mini-mental state examination,MMSE)、蒙特利尔认知评估量表(Montreal cognitive assessment,MoCA)及日常生活活动能力量表(activity of daily living scale,ADL)将其分为非痴呆型血管性认知功能障碍(vascular cognitive impairment no dementia,VCIND)组(VCIND组,n=47)和无认知功能障碍(no vascular cognitive impairment,N-VCI组,n=59),采用酶联免疫吸附法检测两组患者血清VEGF水平,比较两组患者的基线资料、血清VEGF水平、MoCA评分及Fazekas评分,并分析血清VEGF水平与脑白质高信号、认知功能的相关性。采用SPSS 19.0软件进行数据处理,统计方法采用t检验、卡方检验、非参数检验、Logistic回归分析、Pearson相关分析和Spearman相关分析。结果两组患者血清VEGF水平[(464.18±114.58)pg/mL,(414.17±45.80)pg/mL,F=22.880]、MoCA评分[(13.07±6.48)分,(20.17±4.06)分,F=17.920]、Fazekas评分[4(3,5)分,3(1,3)分,Z=-4.189]均差异有统计学意义(均P<0.05)。VEGF水平(β=0.008,OR=1.008,95%CI=1.001~1.015,P<0.05)是CSVD患者认知功能的影响因素。VEGF水平与MoCA量表总分、注意力与计算力、定向力呈负相关(r=-0.345,-0.373,-0.445,均P<0.05),并且与Fazekas评分总分、脑室旁及深部白质Fazekas评分呈正相关(r=0.392,0.495,0.302,均P<0.05)。脑室旁和深部白质的白质高信号等级与VCIND存在线性趋势(均P<0.05)。结论在CSVD患者中血清VEGF水平与认知功能、脑白质高信号具有相关性,VEGF水平升高可能是反映认知功能障碍的因素。此外随着脑白质高信号等级的增加,CSVD患VCIND的风险升高。
