从霍山石斛中分离内生菌,旨在获得具有广谱抗菌活性和促生作用的内生细菌。以石斛黑斑病菌为指示菌,用对峙培养法筛选具有抗菌活性的内生菌;对筛选到的具有拮抗活性的菌株进行抗菌谱和促生长潜力的测定。结果显示,从霍山石斛中分离获得2...从霍山石斛中分离内生菌,旨在获得具有广谱抗菌活性和促生作用的内生细菌。以石斛黑斑病菌为指示菌,用对峙培养法筛选具有抗菌活性的内生菌;对筛选到的具有拮抗活性的菌株进行抗菌谱和促生长潜力的测定。结果显示,从霍山石斛中分离获得22株内生细菌,其中菌株RA具有较强抑菌活性,根据16S r DNA序列分析结果鉴定RA为甲基营养芽孢杆菌Bacillus methylotrophicus。菌株RA可以产生IAA、嗜铁素、蛋白酶、表面活性剂和生物膜,RA对8种植物病原菌也具有较好的抑制作用,具有广谱抗菌活性;并且可以显著促进玉米幼苗的生长。RA菌株具有作为生防菌剂和生物肥料应用的良好潜力。展开更多
目的探讨Ilizarov技术联合跗骨V形截骨在创伤性马蹄内翻足中的应用价值。方法选取2015年6月~2016年6月我院收治的70例创伤性马蹄内翻足患者作为研究对象,按照随机数字表法将患者分为研究组和对照组,每组35例,对照组进行传统手术治疗,研...目的探讨Ilizarov技术联合跗骨V形截骨在创伤性马蹄内翻足中的应用价值。方法选取2015年6月~2016年6月我院收治的70例创伤性马蹄内翻足患者作为研究对象,按照随机数字表法将患者分为研究组和对照组,每组35例,对照组进行传统手术治疗,研究组使用Ilizarov技术联合跗骨V形截骨治疗。比较两组末次随访时国际马蹄足研究组(international clubfoot study group,ICFSG)评分、Kofoed踝关节评分、并发症发生情况和复发情况的差异。结果拆除固定架后6个月,对两组进行ICFSG评分测评,研究组在形态学、功能、影像学、总分等各方面评分均低于对照组,组间比较差异具有统计学意义(P<0.05);研究组各项Kofoed踝关节评分及总分均比对照组高(P<0.05)。两组并发症发生率分别为5.7%、31.4%,研究组并发症发生率低于对照组,组间比较具有统计学差异(P<0.05)。研究组无复发者,对照组复发率为5.7%,组间复发率比较无统计学差异(P>0.05)。结论 Ilizarov技术联合跗骨V形截骨治疗创伤性马蹄内翻足效果好,能够有效改善踝关节功能,减轻患者疼痛,且并发症少,无复发,值得临床推广使用。展开更多
Cluster radioactivity is studied within the generalized liquid drop model(GLDM),in which the shell correction energy,pairing energy,and cluster preformation factor are considered.The calculations show significant impr...Cluster radioactivity is studied within the generalized liquid drop model(GLDM),in which the shell correction energy,pairing energy,and cluster preformation factor are considered.The calculations show significant improvements and can reproduce the experimental data within a factor of 8.04 after considering these physical effects.In addition,the systematic trend of the cluster preformation factors is discussed in terms of the N_(p)N_(n)scheme to study the influence of the valence proton-neutron interaction and shell effect on cluster radioactivity.It is found that log10Pcis linearly related to N_(p)N_(n).This is in agreement with a recent study[L.Qi et al.,Phys.Rev.C 108,014325(2023)],in which log10Pc,obtained using different theoretical models and treatment methods than those used in this study,also had a linear relationship with N_(p)N_(n).Combined with the work by Qi et al.,this study suggests that the linear relationship between log10Pcand N_(p)N_(n)is model-independent and both the shell effect and valence proton-neutron interaction play essential roles in cluster radioactivity.An analytical formula is proposed to calculate the cluster preformation factor based on the N_(p)N_(n)scheme.In addition,the cluster preformation factors and the cluster radioactivity half-lives of some heavy nuclei are predicted,which can provide a reference for future experiments.展开更多
本文研究了掺氢天然气直接内重整平管型固体氧化物电池短堆的长期稳定性和衰减机理。通过约3000小时的实测实验,结果显示,电堆的总体衰减率为2.3%·kh^(-1),电堆中三个金属连接板的面积比电阻分别增加了0.276Ω·cm^(2)、0.254...本文研究了掺氢天然气直接内重整平管型固体氧化物电池短堆的长期稳定性和衰减机理。通过约3000小时的实测实验,结果显示,电堆的总体衰减率为2.3%·kh^(-1),电堆中三个金属连接板的面积比电阻分别增加了0.276Ω·cm^(2)、0.254Ω·cm^(2)和0.249Ω·cm^(2),但电堆中两个电池的电压反而分别增加了3.38 m V·kh^(-1)和3.78 m V·kh^(-1)。电堆衰减主要由金属连接件表层氧化及其与阴极集流层材料反应生成Sr CrO_(4)物质,两者共同作用增大了电池与金属连接体间的界面电阻所致。结果表明,以掺氢天然气为燃料直接内重整平管型固体氧化物燃料电池电堆具有良好的稳定性。本文工作为掺氢天然气在固体氧化物燃料电池堆中的直接内重整应用提供了理论参考与实验依据。展开更多
From both the fundamental and applied perspectives, fragment mass distributions are important observablesof fission. We apply the Bayesian neural network (BNN) approach to learn the existing neutron induced fissionyie...From both the fundamental and applied perspectives, fragment mass distributions are important observablesof fission. We apply the Bayesian neural network (BNN) approach to learn the existing neutron induced fissionyields and predict unknowns with uncertainty quantification. Comparing the predicted results with experimentaldata, the BNN evaluation results are found to be satisfactory for the distribution positions and energy dependenciesof fission yields. Predictions are made for the fragment mass distributions of several actinides, which may beuseful for future experiments.展开更多
文摘从霍山石斛中分离内生菌,旨在获得具有广谱抗菌活性和促生作用的内生细菌。以石斛黑斑病菌为指示菌,用对峙培养法筛选具有抗菌活性的内生菌;对筛选到的具有拮抗活性的菌株进行抗菌谱和促生长潜力的测定。结果显示,从霍山石斛中分离获得22株内生细菌,其中菌株RA具有较强抑菌活性,根据16S r DNA序列分析结果鉴定RA为甲基营养芽孢杆菌Bacillus methylotrophicus。菌株RA可以产生IAA、嗜铁素、蛋白酶、表面活性剂和生物膜,RA对8种植物病原菌也具有较好的抑制作用,具有广谱抗菌活性;并且可以显著促进玉米幼苗的生长。RA菌株具有作为生防菌剂和生物肥料应用的良好潜力。
文摘目的探讨Ilizarov技术联合跗骨V形截骨在创伤性马蹄内翻足中的应用价值。方法选取2015年6月~2016年6月我院收治的70例创伤性马蹄内翻足患者作为研究对象,按照随机数字表法将患者分为研究组和对照组,每组35例,对照组进行传统手术治疗,研究组使用Ilizarov技术联合跗骨V形截骨治疗。比较两组末次随访时国际马蹄足研究组(international clubfoot study group,ICFSG)评分、Kofoed踝关节评分、并发症发生情况和复发情况的差异。结果拆除固定架后6个月,对两组进行ICFSG评分测评,研究组在形态学、功能、影像学、总分等各方面评分均低于对照组,组间比较差异具有统计学意义(P<0.05);研究组各项Kofoed踝关节评分及总分均比对照组高(P<0.05)。两组并发症发生率分别为5.7%、31.4%,研究组并发症发生率低于对照组,组间比较具有统计学差异(P<0.05)。研究组无复发者,对照组复发率为5.7%,组间复发率比较无统计学差异(P>0.05)。结论 Ilizarov技术联合跗骨V形截骨治疗创伤性马蹄内翻足效果好,能够有效改善踝关节功能,减轻患者疼痛,且并发症少,无复发,值得临床推广使用。
基金Supported by the National Natural Science Foundation of China(12175170)Hubei Provincial Natural Science Foundation of China(2023AFB035)+1 种基金Hunan Outstanding Youth Science Foundation(2022JJ10031)Natural Science Research Project of Yichang City(A23-2-028)。
文摘Cluster radioactivity is studied within the generalized liquid drop model(GLDM),in which the shell correction energy,pairing energy,and cluster preformation factor are considered.The calculations show significant improvements and can reproduce the experimental data within a factor of 8.04 after considering these physical effects.In addition,the systematic trend of the cluster preformation factors is discussed in terms of the N_(p)N_(n)scheme to study the influence of the valence proton-neutron interaction and shell effect on cluster radioactivity.It is found that log10Pcis linearly related to N_(p)N_(n).This is in agreement with a recent study[L.Qi et al.,Phys.Rev.C 108,014325(2023)],in which log10Pc,obtained using different theoretical models and treatment methods than those used in this study,also had a linear relationship with N_(p)N_(n).Combined with the work by Qi et al.,this study suggests that the linear relationship between log10Pcand N_(p)N_(n)is model-independent and both the shell effect and valence proton-neutron interaction play essential roles in cluster radioactivity.An analytical formula is proposed to calculate the cluster preformation factor based on the N_(p)N_(n)scheme.In addition,the cluster preformation factors and the cluster radioactivity half-lives of some heavy nuclei are predicted,which can provide a reference for future experiments.
基金financial supports from the National Key Research and Development Program of China (No.2022YFB4003602)National Natural Science Foundation of China (No. U20A20251,No.11932005)+1 种基金Key R&D projects in Zhejiang Province (No.2021C01101)Ningbo Key R&D project (No.2023Z145)。
文摘本文研究了掺氢天然气直接内重整平管型固体氧化物电池短堆的长期稳定性和衰减机理。通过约3000小时的实测实验,结果显示,电堆的总体衰减率为2.3%·kh^(-1),电堆中三个金属连接板的面积比电阻分别增加了0.276Ω·cm^(2)、0.254Ω·cm^(2)和0.249Ω·cm^(2),但电堆中两个电池的电压反而分别增加了3.38 m V·kh^(-1)和3.78 m V·kh^(-1)。电堆衰减主要由金属连接件表层氧化及其与阴极集流层材料反应生成Sr CrO_(4)物质,两者共同作用增大了电池与金属连接体间的界面电阻所致。结果表明,以掺氢天然气为燃料直接内重整平管型固体氧化物燃料电池电堆具有良好的稳定性。本文工作为掺氢天然气在固体氧化物燃料电池堆中的直接内重整应用提供了理论参考与实验依据。
基金the National Natural Science Foundation of China(12175064,U2167203)the Outstanding Youth Science Foundation of Hunan Province,China(2022JJ10031)。
文摘From both the fundamental and applied perspectives, fragment mass distributions are important observablesof fission. We apply the Bayesian neural network (BNN) approach to learn the existing neutron induced fissionyields and predict unknowns with uncertainty quantification. Comparing the predicted results with experimentaldata, the BNN evaluation results are found to be satisfactory for the distribution positions and energy dependenciesof fission yields. Predictions are made for the fragment mass distributions of several actinides, which may beuseful for future experiments.
