Objective To investigate the effect of no-touch harvesting technique in reducing vein graft intimal hyperplasia. Methods This longitudinal trial compared graft angiostenosis of two groups undergoing jugular vein to ca...Objective To investigate the effect of no-touch harvesting technique in reducing vein graft intimal hyperplasia. Methods This longitudinal trial compared graft angiostenosis of two groups undergoing jugular vein to carotid artery interposition grafting in rabbit model. Conventional group:12 rabbits had their veins stripped,distended,and stored in heparinized saline solution. No-touch group:12 rabbits had veins removed with surrounding tissues,but were not distended,and stored in heparinized blood. The grafts were removed 4 weeks following grafting,and morphometry and immunohistochemistry assessment were performed. Results The intimal thickness,degree of angiostenosis and proliferation index of vascular smooth muscle cells of no-touch group were significantly reduced (P<0.01) compared with those of the conventional group. The proliferating cell nuclear antigen positive-staining cells were significantly increased (P<0.01) in the conventional group compared with whose in the no-touch group. Conclusion Harvesting the vein graft with no-touch harvesting technique could significantly reduce intimal hyperplasia of the vein graft.展开更多
Background:Liver transplantation(LT)is the best treatment for patients with hepatocellular carcinoma(HCC).However,the surgical technique needs to be improved.The present study aimed to evaluate the“no-touch”techniqu...Background:Liver transplantation(LT)is the best treatment for patients with hepatocellular carcinoma(HCC).However,the surgical technique needs to be improved.The present study aimed to evaluate the“no-touch”technique in LT.Methods:From January 2018 to December 2019,we performed a prospective randomized controlled trial on HCC patients who underwent LT.The patients were randomized into two groups:a no-touch technique LT group(NT group,n=38)and a conventional LT technique group(CT group,n=46).Operative outcomes and survival in the two groups were analyzed.Results:The perioperative parameters were comparable between the two groups(P>0.05).There was no significant difference between the two groups in disease-free survival(DFS)(P=0.732)or overall survival(OS)(P=0.891).Of 36 patients who were beyond the Hangzhou criteria for LT,the DFS of the patients in the NT group was significantly longer than that in the CT group(median 402 vs.126 days,P=0.025).In 31 patients who had portal vein tumor thrombosis(PVTT),DFS and OS in the NT group were significantly better than those in the CT group(median DFS 420 vs.167 days,P=0.022;2-year OS rate 93.8%vs.66.7%,P=0.043).In 14 patients who had diffuse-type HCCs,DFS and OS were significantly better in the NT group than those in the CT group(median DFS 141 vs.56 days,P=0.008;2-year OS rate 75.0%vs.33.3%,P=0.034).Multivariate analysis showed that for patients with PVTT and diffusetype HCCs,the no-touch technique was an independent favorable factor for OS(PVTT:HR=0.018,95%CI:0.001-0.408,P=0.012;diffuse-type HCCs:HR=0.034,95%CI:0.002-0.634,P=0.024).Conclusions:The no-touch technique improved the survival of patients with advanced HCC compared with the conventional technique.The no-touch technique may provide a new and effective LT technique for advanced HCCs.展开更多
AIM To perform a systematic review and meta-analysis on minimally vs conventional invasive techniques for harvesting grafts for living donor liver transplantation.METHODS Pub Med,Web of Science,EMBASE,and the Cochrane...AIM To perform a systematic review and meta-analysis on minimally vs conventional invasive techniques for harvesting grafts for living donor liver transplantation.METHODS Pub Med,Web of Science,EMBASE,and the Cochrane Library were searched comprehensively for studies comparing MILDH with conventional living donor hepatectomy(CLDH).Intraoperative and postoperative outcomes(operative time,estimated blood loss,postoperative liver function,length of hospital stay,analgesia use,complications,and survival rate)were analyzed in donors and recipients.Articles were included if they:(1)compared the outcomes of MILDH and CLDH;and(2)reported at least some of the above outcomes.RESULTS Of 937 articles identified,13,containing 1592 patients,met our inclusion criteria and were included in the meta-analysis.For donors,operative time[weighted mean difference(WMD)=20.68,95%CI:-6.25-47.60, =0.13]and blood loss(WMD=-32.61,95%CI:-80.44-5.21, =0.18)were comparable in the two groups.In contrast,analgesia use(WMD=-7.79,9 5%C I:-1 4.0 6-1.8 7, =0.0 1),posto pera tive complications[odds ratio(OR)=0.62,95%CI:0.44-0.89, =0.009],and length of hospital stay(W M D):-1.2 5,9 5%C I:-2.3 5-0.1 4, =0.0 3)significantly favored MILDH.No differences were observed in recipient outcomes,including postoperative complications(OR=0.93,95%CI:0.66-1.31, =0.68)and survival rate(HR=0.96,95%CI:0.27-3.47, =0.95).Funnel plot and statistical methods showed a low probability of publication bias.CONCLUSION MILDH is safe,effective,and feasible for living donor liver resection with fewer donor postoperative complications,reduced length of hospital stay and analgesia requirement than CLDH.展开更多
Objective The study aimed to compare quality of saphenous vein(SV)grafts,wound complications,and clinical outcomes between endoscopic vein harvesting(EVH)technique and open vein harvesting(OVH)technique of coronary ar...Objective The study aimed to compare quality of saphenous vein(SV)grafts,wound complications,and clinical outcomes between endoscopic vein harvesting(EVH)technique and open vein harvesting(OVH)technique of coronary artery bypass graft(CABG)surgery.Methods One hundred patients with multi-vessel coronary disease underwent elective CABG using SV grafts were prospectively recruited and randomized into two groups.展开更多
While sufficient review articles exist on inductive short-range wireless power transfer(WPT),long-haul microwave WPT(MWPT)for solar power satellites,and ambient microwave wireless energy harvesting(MWEH)in urban areas...While sufficient review articles exist on inductive short-range wireless power transfer(WPT),long-haul microwave WPT(MWPT)for solar power satellites,and ambient microwave wireless energy harvesting(MWEH)in urban areas,few studies focus on the fundamental modeling and related design automation of receiver systems.This article reviews the development of MWPT and MWEH receivers,with a focus on rectenna design automation.A novel rectifier model capable of accurately modeling the rectification process under both high and low input power is presented.The model reveals the theoretical boundary of radio frequency-to-direct current(dc)power conversion efficiency and,most importantly,enables an automated system design.The automated rectenna design flow is sequential,with the minimal engagement of iterative optimization.It covers the design automation of every module(i.e.,rectifiers,matching circuits,antennae,and dc–dc converters).Scaling-up of the technique to large rectenna arrays is also possible,where the challenges in array partitioning and power combining are briefly discussed.In addition,several cutting-edge rectenna techniques for MWPT and MWEH are reviewed,including the dynamic range extension technique,the harmonics-based retro-directive technique,and the simultaneous wireless information and power transfer technique,which can be good complements to the presented automated design methodology.展开更多
In this paper,the throughput and delay of cooperative communications are derived when solar energy is used and relay node is selected using a timer.The source and relays harvest energy from sun using a photo voltaic s...In this paper,the throughput and delay of cooperative communications are derived when solar energy is used and relay node is selected using a timer.The source and relays harvest energy from sun using a photo voltaic system.The harvested power is used by the source to transmit data to the relays.Then,a selected relay amplifies the signal to the destination.Opportunistic,partial and reactive relay selection are used.The relay transmits when its timer elapses.The timer is set to a value proportional to the inverse of its Signal to Noise Ratio(SNR).Therefore,the relay with largest SNR will transmit first and its signal will be detected by the other relays that will remain idle to avoid collisions.Harvesting duration is optimized to maximize the throughput.Packet’s waiting time and total delay are also computed.We also derive the statistics of SNR when solar energy is used.The harvested power from sun is proportional to the sum of a deterministic radiation intensity and a random attenuation due to weather effects and clouds occlusion.The fixed radiation intensity depends on season,month and time t in hour.The throughput of cooperative communications with energy harvesting from sun was not yet studied.展开更多
This paper deals with the relationships between forest harvesting and forest ccology.Itproposes basing annual cuts and forest operation plans on ecological principles.Harvestable forest re-sources are decreasing and r...This paper deals with the relationships between forest harvesting and forest ccology.Itproposes basing annual cuts and forest operation plans on ecological principles.Harvestable forest re-sources are decreasing and regeneration is slow.The combination of forest harvesting with ccologycan be viewed as a solution to the forest harvesting dilemma in China.This paper also makes sometechnical recommendations for forest operations based on ecological principles.展开更多
Good practice in post-harvest operations depends on the contamination of groundnuts (<em>Arachis hypogaea</em>) by mycotoxins. The objective of this study is to identify farmers’ practices that pose a ris...Good practice in post-harvest operations depends on the contamination of groundnuts (<em>Arachis hypogaea</em>) by mycotoxins. The objective of this study is to identify farmers’ practices that pose a risk to the post-harvest preservation of the fruits of <em>Arachis hypogaea</em> in the province of Mayo Kebbi Ouest. Data collection was carried out using a farmer survey sheet based on a questionnaire on drying and storage techniques and losses related to groundnut harvesting. The study revealed that the fruits of<em> Arachis hypogaea </em>are dried on the fields and stored in shells or pods in polyethylene bags. The latter can be kept for up to 6 months in the shop (44%), in the attic (25.3%), in living quarters (18.7%) and both in the attic and in houses (12%). The level of post-harvest losses is due on the one hand to post-harvest diseases (60%) and the presence of insects on the crops (32%) and on the other hand to the germination of seeds (8%) after the harvest due to heavy rains. This loss on a scale of 2% to 10% is 74.7% and 10% to 50% is 25.3%. Drying and storage techniques in these localities represent a risk of mycotoxin contamination of groundnuts. Raising farmers’ awareness of harvest management techniques to preserve the sanitary quality of groundnuts would be important.展开更多
文摘Objective To investigate the effect of no-touch harvesting technique in reducing vein graft intimal hyperplasia. Methods This longitudinal trial compared graft angiostenosis of two groups undergoing jugular vein to carotid artery interposition grafting in rabbit model. Conventional group:12 rabbits had their veins stripped,distended,and stored in heparinized saline solution. No-touch group:12 rabbits had veins removed with surrounding tissues,but were not distended,and stored in heparinized blood. The grafts were removed 4 weeks following grafting,and morphometry and immunohistochemistry assessment were performed. Results The intimal thickness,degree of angiostenosis and proliferation index of vascular smooth muscle cells of no-touch group were significantly reduced (P<0.01) compared with those of the conventional group. The proliferating cell nuclear antigen positive-staining cells were significantly increased (P<0.01) in the conventional group compared with whose in the no-touch group. Conclusion Harvesting the vein graft with no-touch harvesting technique could significantly reduce intimal hyperplasia of the vein graft.
基金supported by grants from the National Key R&D Program of China(2017ZX10203205-005-004)Research Project of Jinan Microecological Biomedicine Shandong Laboratory(JNL-2022022C)Grant from Health Commission of Zhejiang Province(JBZX-202004)。
文摘Background:Liver transplantation(LT)is the best treatment for patients with hepatocellular carcinoma(HCC).However,the surgical technique needs to be improved.The present study aimed to evaluate the“no-touch”technique in LT.Methods:From January 2018 to December 2019,we performed a prospective randomized controlled trial on HCC patients who underwent LT.The patients were randomized into two groups:a no-touch technique LT group(NT group,n=38)and a conventional LT technique group(CT group,n=46).Operative outcomes and survival in the two groups were analyzed.Results:The perioperative parameters were comparable between the two groups(P>0.05).There was no significant difference between the two groups in disease-free survival(DFS)(P=0.732)or overall survival(OS)(P=0.891).Of 36 patients who were beyond the Hangzhou criteria for LT,the DFS of the patients in the NT group was significantly longer than that in the CT group(median 402 vs.126 days,P=0.025).In 31 patients who had portal vein tumor thrombosis(PVTT),DFS and OS in the NT group were significantly better than those in the CT group(median DFS 420 vs.167 days,P=0.022;2-year OS rate 93.8%vs.66.7%,P=0.043).In 14 patients who had diffuse-type HCCs,DFS and OS were significantly better in the NT group than those in the CT group(median DFS 141 vs.56 days,P=0.008;2-year OS rate 75.0%vs.33.3%,P=0.034).Multivariate analysis showed that for patients with PVTT and diffusetype HCCs,the no-touch technique was an independent favorable factor for OS(PVTT:HR=0.018,95%CI:0.001-0.408,P=0.012;diffuse-type HCCs:HR=0.034,95%CI:0.002-0.634,P=0.024).Conclusions:The no-touch technique improved the survival of patients with advanced HCC compared with the conventional technique.The no-touch technique may provide a new and effective LT technique for advanced HCCs.
基金Science and Technology Planning Project of Guangzhou,No.201604020001
文摘AIM To perform a systematic review and meta-analysis on minimally vs conventional invasive techniques for harvesting grafts for living donor liver transplantation.METHODS Pub Med,Web of Science,EMBASE,and the Cochrane Library were searched comprehensively for studies comparing MILDH with conventional living donor hepatectomy(CLDH).Intraoperative and postoperative outcomes(operative time,estimated blood loss,postoperative liver function,length of hospital stay,analgesia use,complications,and survival rate)were analyzed in donors and recipients.Articles were included if they:(1)compared the outcomes of MILDH and CLDH;and(2)reported at least some of the above outcomes.RESULTS Of 937 articles identified,13,containing 1592 patients,met our inclusion criteria and were included in the meta-analysis.For donors,operative time[weighted mean difference(WMD)=20.68,95%CI:-6.25-47.60, =0.13]and blood loss(WMD=-32.61,95%CI:-80.44-5.21, =0.18)were comparable in the two groups.In contrast,analgesia use(WMD=-7.79,9 5%C I:-1 4.0 6-1.8 7, =0.0 1),posto pera tive complications[odds ratio(OR)=0.62,95%CI:0.44-0.89, =0.009],and length of hospital stay(W M D):-1.2 5,9 5%C I:-2.3 5-0.1 4, =0.0 3)significantly favored MILDH.No differences were observed in recipient outcomes,including postoperative complications(OR=0.93,95%CI:0.66-1.31, =0.68)and survival rate(HR=0.96,95%CI:0.27-3.47, =0.95).Funnel plot and statistical methods showed a low probability of publication bias.CONCLUSION MILDH is safe,effective,and feasible for living donor liver resection with fewer donor postoperative complications,reduced length of hospital stay and analgesia requirement than CLDH.
文摘Objective The study aimed to compare quality of saphenous vein(SV)grafts,wound complications,and clinical outcomes between endoscopic vein harvesting(EVH)technique and open vein harvesting(OVH)technique of coronary artery bypass graft(CABG)surgery.Methods One hundred patients with multi-vessel coronary disease underwent elective CABG using SV grafts were prospectively recruited and randomized into two groups.
基金supported by the Singapore Ministry of Education Academic Research Fund Tier 1。
文摘While sufficient review articles exist on inductive short-range wireless power transfer(WPT),long-haul microwave WPT(MWPT)for solar power satellites,and ambient microwave wireless energy harvesting(MWEH)in urban areas,few studies focus on the fundamental modeling and related design automation of receiver systems.This article reviews the development of MWPT and MWEH receivers,with a focus on rectenna design automation.A novel rectifier model capable of accurately modeling the rectification process under both high and low input power is presented.The model reveals the theoretical boundary of radio frequency-to-direct current(dc)power conversion efficiency and,most importantly,enables an automated system design.The automated rectenna design flow is sequential,with the minimal engagement of iterative optimization.It covers the design automation of every module(i.e.,rectifiers,matching circuits,antennae,and dc–dc converters).Scaling-up of the technique to large rectenna arrays is also possible,where the challenges in array partitioning and power combining are briefly discussed.In addition,several cutting-edge rectenna techniques for MWPT and MWEH are reviewed,including the dynamic range extension technique,the harmonics-based retro-directive technique,and the simultaneous wireless information and power transfer technique,which can be good complements to the presented automated design methodology.
基金the Deanship of Scientific Research at Saudi Electronic University for funding this research work through the project number 8092.
文摘In this paper,the throughput and delay of cooperative communications are derived when solar energy is used and relay node is selected using a timer.The source and relays harvest energy from sun using a photo voltaic system.The harvested power is used by the source to transmit data to the relays.Then,a selected relay amplifies the signal to the destination.Opportunistic,partial and reactive relay selection are used.The relay transmits when its timer elapses.The timer is set to a value proportional to the inverse of its Signal to Noise Ratio(SNR).Therefore,the relay with largest SNR will transmit first and its signal will be detected by the other relays that will remain idle to avoid collisions.Harvesting duration is optimized to maximize the throughput.Packet’s waiting time and total delay are also computed.We also derive the statistics of SNR when solar energy is used.The harvested power from sun is proportional to the sum of a deterministic radiation intensity and a random attenuation due to weather effects and clouds occlusion.The fixed radiation intensity depends on season,month and time t in hour.The throughput of cooperative communications with energy harvesting from sun was not yet studied.
文摘This paper deals with the relationships between forest harvesting and forest ccology.Itproposes basing annual cuts and forest operation plans on ecological principles.Harvestable forest re-sources are decreasing and regeneration is slow.The combination of forest harvesting with ccologycan be viewed as a solution to the forest harvesting dilemma in China.This paper also makes sometechnical recommendations for forest operations based on ecological principles.
文摘Good practice in post-harvest operations depends on the contamination of groundnuts (<em>Arachis hypogaea</em>) by mycotoxins. The objective of this study is to identify farmers’ practices that pose a risk to the post-harvest preservation of the fruits of <em>Arachis hypogaea</em> in the province of Mayo Kebbi Ouest. Data collection was carried out using a farmer survey sheet based on a questionnaire on drying and storage techniques and losses related to groundnut harvesting. The study revealed that the fruits of<em> Arachis hypogaea </em>are dried on the fields and stored in shells or pods in polyethylene bags. The latter can be kept for up to 6 months in the shop (44%), in the attic (25.3%), in living quarters (18.7%) and both in the attic and in houses (12%). The level of post-harvest losses is due on the one hand to post-harvest diseases (60%) and the presence of insects on the crops (32%) and on the other hand to the germination of seeds (8%) after the harvest due to heavy rains. This loss on a scale of 2% to 10% is 74.7% and 10% to 50% is 25.3%. Drying and storage techniques in these localities represent a risk of mycotoxin contamination of groundnuts. Raising farmers’ awareness of harvest management techniques to preserve the sanitary quality of groundnuts would be important.
