背景:血流限制训练目前逐渐应用于康复临床领域,适用于不能进行高强度抗阻训练的临床病患人群。血流限制训练在康复领域的研究尚未有人进行整合文献计量与可视化分析的研究。目的:探讨21世纪血流限制训练在康复领域中全球的研究现状和...背景:血流限制训练目前逐渐应用于康复临床领域,适用于不能进行高强度抗阻训练的临床病患人群。血流限制训练在康复领域的研究尚未有人进行整合文献计量与可视化分析的研究。目的:探讨21世纪血流限制训练在康复领域中全球的研究现状和发展趋势。方法:通过Web of Science的科学引文索引扩展数据库检索从2000年1月1日至2022年9月19日发表的英文文章及综述。用文献计量学的方法对来源数据进行数据统计及研究。使用Vos viewer软件进行文献耦合分析及共现分析等可视化转化工具,分析血流限制训练在康复中应用的研究现状及趋势改变。结果:本引文研究共纳入1276篇研究,分析发现①全球研究发表文献总体上逐年增加趋势,其中美国对全球的研究贡献量最高,研究文献总被引用次数与H指数是最高,日本在每项平均引用次数的项目中排名最高,中国在全球研究发表量排行第九,被引频次总数、每项平均引用次数与H指数分别排在第十八、第十八和第二十位。②根据文献计量学结果,“MEDICINE AND SCIENCE IN SPORTS AND EXERCISE”和“EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY”杂志的出版物发表量居第一和第二。密西西比大学(UNIVERSITY OF MISSISSIPPI)和俄克拉何马大学系统(UNIVERSITY OF OKLAHOMA SYSTEM)是文献发表物数量贡献最大的机构。③根据可视化分析结果,此领域的研究目前可以分为五大类:生理机制研究、与关节相关疾病康复影响研究、对运动员训练影响研究、肌肉肥大效果研究、心血管系统影响研究。最新的趋势表明,与关节相关疾病康复影响、对运动员训练影响、心血管系统影响的研究开始逐渐成为研究热点。结论:由目前的全球趋势可知,血流限制训练的研究在不断深化,对应的文献出版物数量将不断增加,且主要集中于体育事业较发达的国家。目前的研究主要集中于生理机制研究、与关节相关疾病康复影响研究、对运动员训练影响研究、肌肉肥大效果研究、心血管系统影响研究。与关节相关疾病康复影响可能是该领域下一个重点热点研究。展开更多
A large number of debris flows occurred in the Wenchuan earthquake zone after the 12 May 2008 earthquake.The risks posed by these debris flows were rather high.An appropriate model is required to predict the possible ...A large number of debris flows occurred in the Wenchuan earthquake zone after the 12 May 2008 earthquake.The risks posed by these debris flows were rather high.An appropriate model is required to predict the possible runout distance and impacted area.This paper describes a study on the runout characteristics of the debris flows that occurred in the Wenchuan earthquake zone over the past four years.A total of 120 debris flows are analyzed.Separate multivariate regression models are established for the runout distances of hill-slope debris flows and channelized debris flows.The control variables include type of debris flow,debris flow volume,and elevation difference.Comparison of the debris flows occurring before and after the earthquake shows that the runout distance increased after the earthquake due to sufficient material supply and increased mobility of the source materials.In addition,the runout distances of annual debris flow events in 2008,2010 and 2011 are analyzed and compared.There is a tendency that the runout distance decreases over time due to the decreasing source material volume and possible changes of debris flow type.Comparison between the debris flows in the earthquake zone and the debris flows in Swiss Alps,Canada,Austria,and Japan shows that the former have a smaller mobility.展开更多
On 13 August 2010, a catastrophic debris flow with a volume of 1.17 million m3 occurred in Xiaojiagou Ravine near Yingxiu town of Wenchuan county in Sichuan Province, China. The main source material was the landslide ...On 13 August 2010, a catastrophic debris flow with a volume of 1.17 million m3 occurred in Xiaojiagou Ravine near Yingxiu town of Wenchuan county in Sichuan Province, China. The main source material was the landslide deposits retained in the ravine during the 2008 Wenchuan earthquake. This paper describes a two-dimensional hybrid numerical method that simulates the entire process of the debris flow from initiation to transportation and finally to deposition. The study area is discretized into a grid of square zones. A two dimensional finite difference method is then applied to simulate the rainfall-runoff and debris flow runout processes. The analysis is divided into three steps; namely, rainfall-runoff simulation, mixing water and solid materials, and debris flow runout simulation. The rainfall-runoff simulation is firstly conducted to obtain the cumulative runoff near the location of main source material and at the outlet of the first branch. The water and solid materials are then mixed to create an inflow hydrograph for the debris flow runout simulation. The occurrence time and volume of the debris flow can be estimated in this step. Finally the runout process of the debris flow is simulated. When the yield stress is high, it controls the deposition zone. When the yield stress is medium or low, both yield stress and viscosity influence the deposition zone. The flow velocity is largely influenced by the viscosity. The estimated yield stress by the equation, ty = pghsinO, and the estimated viscosity by the equation established by Bisantino et al. （2010） provide good estimates of the area of the debris flow fan and the distribution of deposition depth.展开更多
Agropyron cristatum, a wild relative of common wheat(Triticum aestivum L.), provides many desirable genetic resources for wheat improvement, such as tolerance to cold, drought, and disease. To transfer and utilize the...Agropyron cristatum, a wild relative of common wheat(Triticum aestivum L.), provides many desirable genetic resources for wheat improvement, such as tolerance to cold, drought, and disease. To transfer and utilize these desirable genes, in this study, two wheat-A. cristatum derivatives II-13 and II-23 were identified and analyzed. We found that the number of root tip cell chromosomes was 44 in both II-13 and II-23, but there were four and six P genome chromosomes in II-13 and II-23, respectively, based on genomic in situ hybridization(GISH). The chromosome configurations of II-13 and II-23 were both 2 n=22 II by the meiotic analysis of pollen mother cells(PMCs) at metaphase I, indicating that there were two and three pairs of P chromosomes in II-13 and II-23, respectively. Notably, wheat chromosome 7 D was absent in derivative line II-13 while II-23 lacked chromosomes 4 B and 7 A based on SSR analysis combining fluorescence in situ hybridization(FISH) analysis with p As1 and p Sc119.2 as probes. Chromosomes 2 P and 7 P were detected in both II-13 and II-23. Another pair of P genome chromosomes in II-23 was determined to be 4 P based on expressed-sequences tags-sequence tagged sites(EST-STS) markers specific to A. cristatum and FISH with probes p Ac TRT1 and p Acp CR2. Overall, these results suggest that II-13 was a 7 P(7 D) substitution line with one pair of additional 2 P chromosomes and II-23 was a multiple 4 P(4 B), 7 P(7 A) substitution line with one pair of additional 2 P chromosomes. Moreover, we obtained six alien disomic addition lines and five alien disomic substitution lines by backcrossing. These new materials will allow desirable genes from A. cristatum to be used in common wheat.展开更多
文摘背景:血流限制训练目前逐渐应用于康复临床领域,适用于不能进行高强度抗阻训练的临床病患人群。血流限制训练在康复领域的研究尚未有人进行整合文献计量与可视化分析的研究。目的:探讨21世纪血流限制训练在康复领域中全球的研究现状和发展趋势。方法:通过Web of Science的科学引文索引扩展数据库检索从2000年1月1日至2022年9月19日发表的英文文章及综述。用文献计量学的方法对来源数据进行数据统计及研究。使用Vos viewer软件进行文献耦合分析及共现分析等可视化转化工具,分析血流限制训练在康复中应用的研究现状及趋势改变。结果:本引文研究共纳入1276篇研究,分析发现①全球研究发表文献总体上逐年增加趋势,其中美国对全球的研究贡献量最高,研究文献总被引用次数与H指数是最高,日本在每项平均引用次数的项目中排名最高,中国在全球研究发表量排行第九,被引频次总数、每项平均引用次数与H指数分别排在第十八、第十八和第二十位。②根据文献计量学结果,“MEDICINE AND SCIENCE IN SPORTS AND EXERCISE”和“EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY”杂志的出版物发表量居第一和第二。密西西比大学(UNIVERSITY OF MISSISSIPPI)和俄克拉何马大学系统(UNIVERSITY OF OKLAHOMA SYSTEM)是文献发表物数量贡献最大的机构。③根据可视化分析结果,此领域的研究目前可以分为五大类:生理机制研究、与关节相关疾病康复影响研究、对运动员训练影响研究、肌肉肥大效果研究、心血管系统影响研究。最新的趋势表明,与关节相关疾病康复影响、对运动员训练影响、心血管系统影响的研究开始逐渐成为研究热点。结论:由目前的全球趋势可知,血流限制训练的研究在不断深化,对应的文献出版物数量将不断增加,且主要集中于体育事业较发达的国家。目前的研究主要集中于生理机制研究、与关节相关疾病康复影响研究、对运动员训练影响研究、肌肉肥大效果研究、心血管系统影响研究。与关节相关疾病康复影响可能是该领域下一个重点热点研究。
基金the support from Sichuan Provincial Department of Transportation and Communicationsthe National Basic Research Program of China (Grant No.2011CB013506)the Research Grants Council of the Hong Kong SAR (Grant No.622210)
文摘A large number of debris flows occurred in the Wenchuan earthquake zone after the 12 May 2008 earthquake.The risks posed by these debris flows were rather high.An appropriate model is required to predict the possible runout distance and impacted area.This paper describes a study on the runout characteristics of the debris flows that occurred in the Wenchuan earthquake zone over the past four years.A total of 120 debris flows are analyzed.Separate multivariate regression models are established for the runout distances of hill-slope debris flows and channelized debris flows.The control variables include type of debris flow,debris flow volume,and elevation difference.Comparison of the debris flows occurring before and after the earthquake shows that the runout distance increased after the earthquake due to sufficient material supply and increased mobility of the source materials.In addition,the runout distances of annual debris flow events in 2008,2010 and 2011 are analyzed and compared.There is a tendency that the runout distance decreases over time due to the decreasing source material volume and possible changes of debris flow type.Comparison between the debris flows in the earthquake zone and the debris flows in Swiss Alps,Canada,Austria,and Japan shows that the former have a smaller mobility.
基金support from Sichuan Provincial Department of Transportation and Communications,the National Basic Research Program of China (Grant No.2011CB013506)the Research Grants Council of the Hong Kong SAR (Grant No.622210)
文摘On 13 August 2010, a catastrophic debris flow with a volume of 1.17 million m3 occurred in Xiaojiagou Ravine near Yingxiu town of Wenchuan county in Sichuan Province, China. The main source material was the landslide deposits retained in the ravine during the 2008 Wenchuan earthquake. This paper describes a two-dimensional hybrid numerical method that simulates the entire process of the debris flow from initiation to transportation and finally to deposition. The study area is discretized into a grid of square zones. A two dimensional finite difference method is then applied to simulate the rainfall-runoff and debris flow runout processes. The analysis is divided into three steps; namely, rainfall-runoff simulation, mixing water and solid materials, and debris flow runout simulation. The rainfall-runoff simulation is firstly conducted to obtain the cumulative runoff near the location of main source material and at the outlet of the first branch. The water and solid materials are then mixed to create an inflow hydrograph for the debris flow runout simulation. The occurrence time and volume of the debris flow can be estimated in this step. Finally the runout process of the debris flow is simulated. When the yield stress is high, it controls the deposition zone. When the yield stress is medium or low, both yield stress and viscosity influence the deposition zone. The flow velocity is largely influenced by the viscosity. The estimated yield stress by the equation, ty = pghsinO, and the estimated viscosity by the equation established by Bisantino et al. （2010） provide good estimates of the area of the debris flow fan and the distribution of deposition depth.
基金supported by the National Key Research and Development Program of China (2016YFD0100102)
文摘Agropyron cristatum, a wild relative of common wheat(Triticum aestivum L.), provides many desirable genetic resources for wheat improvement, such as tolerance to cold, drought, and disease. To transfer and utilize these desirable genes, in this study, two wheat-A. cristatum derivatives II-13 and II-23 were identified and analyzed. We found that the number of root tip cell chromosomes was 44 in both II-13 and II-23, but there were four and six P genome chromosomes in II-13 and II-23, respectively, based on genomic in situ hybridization(GISH). The chromosome configurations of II-13 and II-23 were both 2 n=22 II by the meiotic analysis of pollen mother cells(PMCs) at metaphase I, indicating that there were two and three pairs of P chromosomes in II-13 and II-23, respectively. Notably, wheat chromosome 7 D was absent in derivative line II-13 while II-23 lacked chromosomes 4 B and 7 A based on SSR analysis combining fluorescence in situ hybridization(FISH) analysis with p As1 and p Sc119.2 as probes. Chromosomes 2 P and 7 P were detected in both II-13 and II-23. Another pair of P genome chromosomes in II-23 was determined to be 4 P based on expressed-sequences tags-sequence tagged sites(EST-STS) markers specific to A. cristatum and FISH with probes p Ac TRT1 and p Acp CR2. Overall, these results suggest that II-13 was a 7 P(7 D) substitution line with one pair of additional 2 P chromosomes and II-23 was a multiple 4 P(4 B), 7 P(7 A) substitution line with one pair of additional 2 P chromosomes. Moreover, we obtained six alien disomic addition lines and five alien disomic substitution lines by backcrossing. These new materials will allow desirable genes from A. cristatum to be used in common wheat.
