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Animal models used to study direct peripheral nerve repair:a systematic review 预览
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作者 Francisco Javier Vela Guadalupe Martínez-Chacón +3 位作者 Alberto Ballestín JoséLuis Campos Francisco Miguel Sánchez-Margallo Elena Abellán 《中国神经再生研究:英文版》 SCIE CAS CSCD 2020年第3期491-502,共12页
Objective:Peripheral nerve repair is required after traumatic injury.This common condition represents a major public health problem worldwide.Recovery after nerve repair depends on several factors,including the severi... Objective:Peripheral nerve repair is required after traumatic injury.This common condition represents a major public health problem worldwide.Recovery after nerve repair depends on several factors,including the severity of the injury,the nerve involved,and the surgeon’s technical skills.Despite the precise microsurgical repair of nerve lesions,adequate functional recovery is not always achieved and,therefore,the regeneration process and surgical techniques are still being studied.Pre-clinical animal models are essential for this research and,for this reason,the focus of the present systematic review(according to the PRISMA statement)was to analyze the different animal models used in pre-clinical peripheral nerve repair studies.Data sources:Original articles,published in English from 2000 to 2018,were collected using the Web of Science,Scopus,and PubMed databases.Data selection:Only preclinical trials on direct nerve repair were included in this review.The articles were evaluated by the first two authors,in accordance with predefined data fields.Outcome measures:The primary outcomes included functional motor abilities,daily activity and regeneration rate.Secondary outcomes included coaptation technique and animal model.Results:This review yielded 267 articles,of which,after completion of the screening,49 studies were analyzed.There were 1425 animals in those 49 studies,being rats,mice,guinea pigs,rabbits,cats and dogs the different pre-clinical models.The nerves used were classified into three groups:head and neck(11),forelimb(8)and hindlimb(30).The techniques used to perform the coaptation were:microsuture(46),glue(12),laser(8)and mechanical(2).The follow-up examinations were histology(43),electrophysiological analysis(24)and behavioral observation(22).Conclusion:The most widely used animal model in the study of peripheral nerve repair is the rat.Other animal models are also used but the cost-benefit of the rat model provides several strengths over the others.Suture techniques are currently the first option for 展开更多
关键词 NERVE MICROSURGERY peripheral NERVE regeneration REPAIR reconstruction DIRECT NERVE REPAIR animal model coaptation PRISMA systematic review
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长段输尿管损伤替代治疗的方法、材料及修复重建的演变历程 预览
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作者 王刚 李东辉 白志明 《中国组织工程研究》 CAS 北大核心 2020年第8期1299-1305,共7页
背景:对于长段输尿管损伤,选用何种替代物及如何对长段损伤的输尿管进行重建,恢复其解剖连续性和功能完整性,对泌尿外科医生来说是非常复杂和棘手的问题。目的:综述长段输尿管损伤修复重建方法的演变及进展。方法:以“输尿管损伤,输尿... 背景:对于长段输尿管损伤,选用何种替代物及如何对长段损伤的输尿管进行重建,恢复其解剖连续性和功能完整性,对泌尿外科医生来说是非常复杂和棘手的问题。目的:综述长段输尿管损伤修复重建方法的演变及进展。方法:以“输尿管损伤,输尿管替代,生物材料,组织工程,生物3D打印”;“ureteral injuries,ureteral replacement,biomaterial,tissue engineering,3D bioprinting”为检索词,应用计算机检索1950至2019年PubMed数据库、Web of Science数据库、Medline数据库及万方医学网数据库发表的文章,选择有关输尿管损伤替代治疗方法材料及修复重建的相关文献。结果与结论:在长段输尿管损伤修复重建中,最早的修复方式是以自体组织如肠道、膀胱肌瓣、颊黏膜等进行移植修补,但此类手术均难以避免对周围组织和器官的损伤。随后人们制造出各种异体非生物材料尝试进行替代,但由于免疫排斥及缺乏蠕动等原因而失败。随着细胞学、生物学、材料学等的不断发展进步,逐渐演变为利用人体自身细胞让缺损的组织、器官再生。伴随着再生医学和3D打印技术的发展,3D生物打印已发展到可打印类似于其体内的对应物复杂的多组分、多层次泌尿系中空管状结构。但目前的生物打印技术仍然无法构建具有正常蠕动、收缩功能的输尿管或膀胱。 展开更多
关键词 输尿管损伤 输尿管替代 重建 生物材料 组织工程 生物3D打印 自体组织 异体组织
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Practical Techniques for Restoration of Architectural Formation Elements in Historical Buildings 预览
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作者 Mahran Anwar 《世界工程和技术(英文)》 2019年第1期193-207,共15页
Restoration of architectural formation elements is basically trying in estimating the optimization method which places it old architectural artist in his work. The article aims at rooting the methodology of restoratio... Restoration of architectural formation elements is basically trying in estimating the optimization method which places it old architectural artist in his work. The article aims at rooting the methodology of restoration of the architectural formation elements. It is essentially intellectual effort by the restorer in assessing the best way the artist and the old architect in his work. In order to reach the purpose behind this works and analyze the original available techniques in the creation period, the restoration process can be completed as fully as possible. The research is concerned with re-confidence in the classical methods in the restoration of buildings as consolidation and reconstruction. The classical method is a real way to restore the building to its original form especially in the availability of all technological tools to achieve reporting and documentation. It is not necessary to extension in using unapplied materials and technique. In this regard, the research was able to provide solutions, ideas and techniques that helped preserve and restore elements of architectural formation. The research also pointed to the importance of linking the physical and plastic aspects of the archaeological element. 展开更多
关键词 Formation ARCHITECTURAL ELEMENTS CASTING STITCHING Reconstruction
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Micro-Scanning Error Correction Technique for an Optical Micro-Scanning Thermal Microscope Imaging System 预览
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作者 Meijing Gao Ying Han +3 位作者 Qiushi Geng Yong Zhao Bozhi Zhang Liuzhu Wang 《北京理工大学学报:英文版》 EI CAS 2019年第3期510-518,共9页
An error correction technique for the micro-scanning instrument of the optical micro-scanning thermal microscope imaging system is proposed. The technique is based on micro-scanning technology combined with the propos... An error correction technique for the micro-scanning instrument of the optical micro-scanning thermal microscope imaging system is proposed. The technique is based on micro-scanning technology combined with the proposed second-order oversampling reconstruction algorithm and local gradient image reconstruction algorithm. In this paper, we describe the local gradient image reconstruction model, the error correction technique, down-sampling model and the error correction principle. In this paper, we use a Lena original image and four low-resolution images obtained from the standard half-pixel displacement to simulate and verify the effectiveness of the proposed technique. In order to verify the effectiveness of the proposed technique, two groups of low-resolution thermal microscope images are collected by the actual thermal microscope imaging system for experimental study. Simulations and experiments show that the proposed technique can reduce the optical micro-scanning errors, improve the imaging effect of the system and improve the system's spatial resolution. It can be applied to other electro-optical imaging systems to improve their resolution. 展开更多
关键词 thermal microscope imaging system OPTICAL micro-scanning local gradient image RECONSTRUCTION second-order OVERSAMPLING RECONSTRUCTION spatial resolution
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改进的回溯正则化自适应匹配追踪算法及应用 预览
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作者 孟宗 潘作舟 +1 位作者 李晶 郭晓林 《高技术通讯》 CAS 北大核心 2019年第2期110-118,共9页
针对压缩感知重构时存在的回溯过度问题,研究了一种改进的回溯正则化自适应匹配追踪(IBRAMP)算法。首先,利用自适应阈值随机地进行原子选取,并通过回溯剔除错误原子的方法来提高重构的正确率。其次,在回溯的同时,通过更新剔除原子序数... 针对压缩感知重构时存在的回溯过度问题,研究了一种改进的回溯正则化自适应匹配追踪(IBRAMP)算法。首先,利用自适应阈值随机地进行原子选取,并通过回溯剔除错误原子的方法来提高重构的正确率。其次,在回溯的同时,通过更新剔除原子序数对应的观测矩阵列来避免回溯过度问题。最后,对观测矩阵进行归一化处理,减少重构时间。实验结果表明,该算法在具备更高成功重构率的同时,能够大幅度减少重构时间。将其用于实际故障轴承信号的重构中,重构结果无论在时域还是在频域中,都能准确地反映实际轴承故障信号中的故障特征。 展开更多
关键词 压缩感知 重构 正交匹配追踪(OMP) 正则化 回溯
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基于预设性能控制的超紧密航天器编队防避撞协同控制 预览
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作者 黄静 孙禄君 +1 位作者 孙俊 刘刚 《飞控与探测》 2019年第3期52-60,共9页
研究了考虑具有外界干扰和防避撞约束的近地轨道超紧密航天器编队的构型控制问题,将反步控制技术、预设性能控制相结合,提出了一种基于预设性能控制的六自由度编队协同鲁棒控制方法。首先,给出了近地轨道完整的编队航天器相对位置和相... 研究了考虑具有外界干扰和防避撞约束的近地轨道超紧密航天器编队的构型控制问题,将反步控制技术、预设性能控制相结合,提出了一种基于预设性能控制的六自由度编队协同鲁棒控制方法。首先,给出了近地轨道完整的编队航天器相对位置和相对姿态非线性动力学方程,并根据状态约束条件转换了相对位置动力学模型;其次,设计了预设性能函数,通过误差转换,建立了系统等效误差模型,基于反步法设计了预设性能鲁棒控制器,进一步应用Lyapunov稳定性定理证明了其闭环系统的一致最终有界性;最后,在MATLAB/Simulink平台上进行了仿真验证,结果表明了方法的有效性。 展开更多
关键词 预设性能控制 航天器编队 队形重构 防避撞 反步控制
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从田野到博物馆——博物馆藏品信息链概念的提出与初步探讨
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作者 曹岳森 《博物院》 2019年第2期98-103,共6页
博物馆藏品自形成之日到入藏博物馆,经历了空间位移和人为拣选的过程。过程中的诸多环节,如发掘、记录、拣选、登记、展示等,均对藏品信息的动态性损益产生了影响。本文提出'藏品信息链'概念,意图指代藏品随着时间和空间的变化... 博物馆藏品自形成之日到入藏博物馆,经历了空间位移和人为拣选的过程。过程中的诸多环节,如发掘、记录、拣选、登记、展示等,均对藏品信息的动态性损益产生了影响。本文提出'藏品信息链'概念,意图指代藏品随着时间和空间的变化而发生的信息变化过程,并初步探讨其明显的断裂性特征、影响及造成信息链断裂的浅、深层次原因,同时对藏品信息链的重建给出了初步的建议。 展开更多
关键词 田野 博物馆 藏品信息链 重建
Recurrent surgical site infection after anterior cruciate ligament reconstruction:A case report 预览
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作者 Don Koh Shi Ming Tan Andrew Hwee Chye Tan 《世界骨科杂志(英文版)》 2019年第6期255-261,共7页
BACKGROUND Surgical site infections following anterior cruciate ligament(ACL)reconstruction are an uncommon but potentially devastating complication.In this study,we present an unusual case of recurrent infection of t... BACKGROUND Surgical site infections following anterior cruciate ligament(ACL)reconstruction are an uncommon but potentially devastating complication.In this study,we present an unusual case of recurrent infection of the knee after an ACL reconstruction,and discuss the importance of accurate diagnosis and appropriate management,including the issue of graft preservation versus removal.CASE SUMMARY A 33-year-old gentleman underwent ACL reconstruction using a hamstring tendon autograft with suspensory Endobutton fixation to the distal femur and an interference screw fixation to the proximal tibia.Four years after ACL reconstruction,he developed an abscess over the proximal tibia and underwent incision and drainage.Remnant suture material was found at the base of the abscess and was removed.Five years later,he re-presented with a lateral distal thigh abscess that encroached the femoral tunnel.He underwent incision and drainage of the abscess which was later complicated by a chronic discharging sinus.Repeated magnetic resonance imaging revealed a fistulous communication between the lateral thigh wound extending toward the femoral tunnel with suggestion of osteomyelitis.Decision was made for a second surgery and the patient was counselled about the need for graft removal should there be intraarticular involvement.Knee arthroscopy revealed the graft to be intact with no evidence of intra-articular involvement.As such,the decision was made to retain the ACL graft.Re-debridement,excision of the sinus tract and removal of Endobutton was also performed in the same setting.Joint fluid cultures did not grow bacteria.However,tissue cultures from the femoral tunnel abscess grew Enterobacter cloacae complex,similar to what grew in tissue cultures from the tibial abscess five years earlier.In view of the recurrent and indolent nature of the infection,antibiotic therapy was escalated from Clindamycin to Ertapenem.He completed a six-week course of intravenous antibiotics and has been well for six months since surgery,with excellent 展开更多
关键词 Chronic SURGICAL SITE INFECTION Anterior CRUCIATE ligament reconstruction SURGICAL SITE INFECTION Graft preservation ENTEROBACTER CLOACAE complex Septic arthritis Case report
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刘老涧泵站水力机械改造设计 预览
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作者 王业宇 祁德丽 吉庆伟 《江苏水利》 2019年第2期63-66,共4页
从刘老涧泵站运行中存在的主要问题出发,泵站改造采用水泵叶轮直径不变,转速减小,改善水泵的空化性能,对关键支撑部位、水泵轴与叶轮座连接形式和水泵叶片固定方式等进行了改造,有效减小了水泵叶轮的运行摆度和不稳定性,并选用流量系数... 从刘老涧泵站运行中存在的主要问题出发,泵站改造采用水泵叶轮直径不变,转速减小,改善水泵的空化性能,对关键支撑部位、水泵轴与叶轮座连接形式和水泵叶片固定方式等进行了改造,有效减小了水泵叶轮的运行摆度和不稳定性,并选用流量系数较大的水力模型以满足流量的要求,提出泵站水力机械设计的合理改造措施。 展开更多
关键词 水利 泵站 机械 改造
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我国商业伦理的现状研究 预览
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作者 王刚 《淮海工学院学报:人文社会科学版》 2019年第7期102-104,共3页
阐述了我国商业伦理的现状,指出我国经济快速发展的同时也产生了一系列商业伦理缺失问题,分析认为:商业文化建设不足、法律法规制度不健全、社会监督不力,是商业伦理缺失产生的原因,进而从打造诚信文化、加强社会监督、完善相关的法律... 阐述了我国商业伦理的现状,指出我国经济快速发展的同时也产生了一系列商业伦理缺失问题,分析认为:商业文化建设不足、法律法规制度不健全、社会监督不力,是商业伦理缺失产生的原因,进而从打造诚信文化、加强社会监督、完善相关的法律法规等方面提出了构建我国商业伦理的对策思考。 展开更多
关键词 商业伦理 重建 社会监督 诚信文化
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旧房改造基坑支护技术难点研究 预览
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作者 李梓文 《广东土木与建筑》 2019年第1期65-67,共3页
以珠海某项目改造工程为研究对象,简述了旧房改造工程基坑支护工程因用地红线限制无法在基坑外施工作业,且旧地下室楼板不能承受大型设备时,通过对旧基坑及楼板加固、支撑体系转换等技术难点研究,提供了旧房改造基坑支护施工的新思路。
关键词 改造 基坑支护 加固 支撑体系
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Early Miocene flora of central Kazakhstan (Turgai Plateau) and its paleoenvironmental implications
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作者 Popova Svetlana Utescher Torsten +3 位作者 Averyanova Anna Tarasevich Valentina Tropina Polina Xing Yaowu 《植物多样性:英文版》 CAS CSCD 2019年第3期183-197,共15页
The investigation of the fossil floras from the Turgai plateau (central Kazakhstan) contributes to a better understanding of the origin of the temperate Turgai type flora which spread to Kazakhstan and adjacent areas ... The investigation of the fossil floras from the Turgai plateau (central Kazakhstan) contributes to a better understanding of the origin of the temperate Turgai type flora which spread to Kazakhstan and adjacent areas during the Oligocene-Miocene transition. In this paper, we present the results of a carpological and palynological study of the Kumyrtas flora collected from a flora-bearing horizon of the regional coalbearing Zhilanchik suite, dated to the Aquitanian period. Pollen analysis identified 33 taxa, with are dominated by angiosperms (about 73%) and reflect zonal vegetation. The high percentages of Betula (27%) and Pterocarya (7.5%) that were found in this flora allows comparisons with other Aquitanian floras of Kazakhstan. Based on descriptions of fossil fruits and seeds, we determined that 19 taxa were dominant;these taxa had meosphytic herbaceous components, suggesting mostly edaphic local conditions. The incongruence between the carpological and the pollen records suggests a significant taphonomical effect. Quantitative reconstruction of the palaeoclimate based on pollen records supports—and slightly extends—previous findings based on fossil leaf data, but contradicts findings deduced from the carpological record. Plant Functional Type (PFT) classification was used to characterize the vegetation patterns. Pollen records show that about 45% of diversity relates to the arboreal broadleaved deciduous components and ca. 35% to conifers. Fossil fruit and seed data indicate riverine vegetation with a high diversity of aquatic components and shrub stratum. 展开更多
关键词 Kazakhstan Turgai FLORA Oligocenee-Miocene TRANSITION PALAEOCLIMATE RECONSTRUCTION PFT
后外侧结构重建对后外侧入路全髋关节置换术后早期脱位的影响 预览
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作者 龚保军 窦强兵 +2 位作者 李行星 袁先发 凤晓翔 《骨科》 CAS 2019年第2期101-104,共4页
目的探讨后外侧结构重建对后外侧入路全髋关节置换术(total hip arthroplasty, THA)后早期脱位的影响。方法回顾性分析2015年1月至2018年1月于我院行后外侧入路初次THA的病人120例,根据术中是否修补关节囊及外旋肌群将病人分为两组:观察... 目的探讨后外侧结构重建对后外侧入路全髋关节置换术(total hip arthroplasty, THA)后早期脱位的影响。方法回顾性分析2015年1月至2018年1月于我院行后外侧入路初次THA的病人120例,根据术中是否修补关节囊及外旋肌群将病人分为两组:观察组60例,舌形切开关节囊,术中将关节囊及外旋肌群原位缝合在大转子后方及臀中肌肌腱附着处;对照组60例,切除后关节囊,术中未进行外旋肌群修补重建。术后3个月内发生的脱位定义为早期脱位,比较两种方法对术后早期脱位率的影响。记录并比较两组病人的手术时间、术腔引流量、髋关节Harris评分。结果观察组手术时间为(51.6±9.5)min,对照组为(45.1±7.5)min,对照组手术时间短于观察组,差异有统计学意义(t=2.008,P=0.036)。观察组术腔引流量为(129.6±11.9)ml,对照组为(136.8±12.4)ml,差异无统计学意义(t=1.187,P=0.269)。观察组未发现早期脱位,对照组早期脱位4例(4/60,脱位率为6.667%),观察组术后Harris评分为(86.1±5.0)分,对照组为(85.9±5.5)分,差异无统计学意义(t=1.416,P=0.092)。结论在后外侧入路THA过程中行后外侧结构重建的手术方式早期脱位率低,修补关节囊及外旋肌群对维持髋关节软组织平衡有一定意义。 展开更多
关键词 关节成形术 置换 关节囊 外旋肌群 重建 后脱位
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Comparison of Efficacy between 3D Navigation-Assisted Percutaneous Iliosacral Screw and Minimally Invasive Reconstruction Plate in Treating Sacroiliac Complex Injury 预览
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作者 Qi-lin LU Yi-liang ZHU +5 位作者 Xu-gui LI Wei XIE Xiao-zhen WANG Xue-zhen SHAO Xian-hua CAI Xi-ming LIU 《当代医学科学(英文)》 SCIE CAS 2019年第1期81-87,共7页
The clinical efficacy was compared between 3D navigation-assisted percutaneous iliosacral screw(3DPS)and minimally invasive reconstruction plate(MIRP)in treating sacroiliac complex injury and the surgical procedures o... The clinical efficacy was compared between 3D navigation-assisted percutaneous iliosacral screw(3DPS)and minimally invasive reconstruction plate(MIRP)in treating sacroiliac complex injury and the surgical procedures of 3DPS were introduced.A retrospective analysis was performed on 49 patients with sacroiliac complex injury from March 2013 to May 2017.Twenty-one cases were treated by 3DPS,and 28 cases by MIRP.Intraoperative indexes as operative time,blood loss,incision length,length of hospital stay and postoperative complications were respectively documented.Quality of reduction was postoperatively evaluated by Matta radiological criteria,and clinical effect was assessed by Majeed scoring criteria at the last followup.Operative time and hospital stay were significantly shortened,and blood loss,and incision length were significantly reduced in 3DPS group as compared with those in MIRP group(P<0.05).No statistically significant difference was found between 3DPS group and MIRP group in the assessment of reduction and function(P>0.05).It was concluded that both 3DPS and MIRP can effectively treat the sacroiliac complex injury,and 3DPS can provide an accurate,safe and minimally invasive fixation with shorter operative time and hospital stay. 展开更多
关键词 SACROILIAC complex injury 3D navigation-assisted system PERCUTANEOUS iliosacral SCREW MINIMALLY INVASIVE reconstruction plate
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腹壁缺损修复与重建中国专家共识(2019版) 被引量:5
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作者 顾岩 田文 +3 位作者 王平 李航宇 中华医学会外科学分会疝与腹壁外科学组 中国医疗保健国际交流促进会临床实用技术分会腹壁修复与重建外科学组 《中国实用外科杂志》 CSCD 北大核心 2019年第2期101-109,共9页
腹壁缺损的治疗是指通过采用各种外科技术对腹壁缺损进行有效修复与重建,从而达到覆盖与保护腹腔内器官,为腹壁提供足够的力学强度支持,进而恢复腹壁的解剖、功能与外观的目的。目前关于腹壁缺损修复与重建的临床研究证据依然缺乏,对于... 腹壁缺损的治疗是指通过采用各种外科技术对腹壁缺损进行有效修复与重建,从而达到覆盖与保护腹腔内器官,为腹壁提供足够的力学强度支持,进而恢复腹壁的解剖、功能与外观的目的。目前关于腹壁缺损修复与重建的临床研究证据依然缺乏,对于大多数的腹壁外科问题仍然不足以建立指南或提供循证医学建议[1]。因此,总结现有文献和临床经验以制定统一共识迫在眉睫。 展开更多
关键词 腹壁缺损 修复 重建 专家共识
QuaPra: Efficient transcript assembly and quantification using quadratic programming with Apriori algorithm
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作者 Xiangjun Ji Weida Tong +5 位作者 Baitang Ning Christopher E. Mason David P. Kreil Pawel P. Labaj Geng Chen Tieliu Shi 《中国科学:生命科学英文版》 SCIE CAS CSCD 2019年第7期937-946,共10页
RNA sequencing(RNA-seq) has greatly facilitated the exploring of transcriptome landscape for diverse organisms.However,transcriptome reconstruction is still challenging due to various limitations of current tools and ... RNA sequencing(RNA-seq) has greatly facilitated the exploring of transcriptome landscape for diverse organisms.However,transcriptome reconstruction is still challenging due to various limitations of current tools and sequencing technologies.Here,we introduce an efficient tool,QuaPra(Quadratic Programming combined with Apriori),for accurate transcriptome assembly and quantification.QuaPra could detect at least 26.5% more low abundance(0.1–1 FPKM) transcripts with over 2.7% increase of sensitivity and precision on simulated data compared to other currently popular tools.Moreover,around one-quarter more known transcripts were correctly assembled by QuaPra than other assemblers on real sequencing data.QuaPra is freely available at http://www.megabionet.org/QuaPra/. 展开更多
关键词 RNA-SEQ TRANSCRIPTOME RECONSTRUCTION TRANSCRIPT ASSEMBLY TRANSCRIPT quantification
西安市西太路快速化改造方案设计 预览
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作者 郭逸轩 胡淼 《城市道桥与防洪》 2019年第3期37-40,9共5页
为加快推进大西安快速路体系的构建,通过交通量分析,确定了西安市西太路快速化改造的设计标准,介绍了改造总体方案以及立交节点方案,为城市道路快速化改造提供了借鉴。
关键词 快速路 改造 总体方案 出入口
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国道521线改建工程城镇过境段交叉体系设计研究 预览
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作者 武建杰 《山西交通科技》 2019年第2期7-10,共4页
结合国道521线改建工程实例,阐述在国省干线公路改扩建设计中有效解决交叉过多、交通组织混乱、交叉间距不满足相关规范要求的设计方法及思路。
关键词 国省干线公路 改建 交叉体系 交通组织 行车安全
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游离胫后动脉皮瓣修复80例口腔颌面部软组织缺损效果评价
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作者 麦潋曦 Mubarak Mashrah +3 位作者 严凌健 万全 林钊宇 潘朝斌 《中国口腔颌面外科杂志》 CAS 2019年第3期275-279,共5页
目的:探讨胫后动脉皮瓣游离移植修复口腔颌面部软组织缺损的临床设计及效果。方法:2017年11月-2018年8月,应用胫后动脉皮瓣修复中山大学孙逸仙纪念医院收治的80例口腔颌面部肿瘤术后缺损。术前应用计算机体层血管成像(CTA)对双侧下肢血... 目的:探讨胫后动脉皮瓣游离移植修复口腔颌面部软组织缺损的临床设计及效果。方法:2017年11月-2018年8月,应用胫后动脉皮瓣修复中山大学孙逸仙纪念医院收治的80例口腔颌面部肿瘤术后缺损。术前应用计算机体层血管成像(CTA)对双侧下肢血管进行评估,明确胫后动、静脉走向及穿支数量,完成穿支体表定位。术中根据受区部位、缺损大小、形态以设计、制备皮瓣,并转移至受区进行修复。对皮瓣大小、血管蒂长度、血管直径、穿支数量、穿支长度、存活率、外形、供区和受区术后并发症等进行总结分析。结果:80例患者中,男56例,女24例;年龄24~90(58.17±1.43)岁;皮瓣大小5 cm×6 cm~7 cm×13 cm,皮瓣厚度0.30~1.00(0.53±0.2) cm,血管蒂长度8~14(10.03±1.4) cm;供区动脉直径1.50~3.00(2.36±0.4) mm,供区静脉直径1.50~4.0(2.99±0.6) mm;穿支数量1~5(2.61±0.9)支(集中于小腿内侧中下1/3),穿支长度0.3~6(1.70±0.7) cm。皮瓣存活率为100%,伤口愈合良好。覆盖于小腿供区缺损处的皮片2例(2.5%)完全坏死,7例(8.7%)部分坏死,但经过换药处理后恢复满意。患者对外形及功能恢复满意。结论:应用胫后动脉皮瓣修复口腔颌面部缺损是一种较好的修复方式。胫后动脉皮瓣可携带近心端筋膜及皮下脂肪组织,用以丰满舌体形态、充填口底缺损、保护血管蒂。 展开更多
关键词 胫后动脉皮瓣 口腔颌面部缺损 肿瘤 修复
基于微观层析成像技术的花岗岩残积土颗粒接触方式研究 预览
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作者 孙银磊 汤连生 《中南大学学报:英文版》 SCIE EI CAS CSCD 2019年第4期938-954,共17页
颗粒的接触方式以及颗粒的规则化处理对于研究岩土力学性质非常关键。本次研究中采集到了广州及福建地区的花岗岩残积土,在实验室条件下将其分别筛分成五种不同的粒组(d<0.075mm,0.075mm≤d<0.1mm,0.1mm≤d<0.2mm,0.2mm≤d<... 颗粒的接触方式以及颗粒的规则化处理对于研究岩土力学性质非常关键。本次研究中采集到了广州及福建地区的花岗岩残积土,在实验室条件下将其分别筛分成五种不同的粒组(d<0.075mm,0.075mm≤d<0.1mm,0.1mm≤d<0.2mm,0.2mm≤d<0.5mmand0.5mm≤d<1.0mm),基于微观层析成像技术研究颗粒之间的接触方式。利用主成分分析法对组成颗粒的体素进行识别和搜索,确定颗粒的中心、方向及尺寸;基于笛卡尔空间坐标系,根据相邻颗粒关键位置的空间坐标,对其接触方式进行判定。结果显示,当花岗岩残积土颗粒粒径小于0.2mm时,颗粒接触方式主要包含面-面、面-角、面-棱、棱-棱、棱-角、角-角接触;当颗粒粒径大于0.2mm时,颗粒接触方式主要包含面-面、面-角、面-棱、棱-棱、棱-角、角-角、球-球、球-面、球-棱、球-角接触。土样的原始孔隙率、重建后的孔隙率及规则化后的孔隙率三者之间存在差异,这主要与花岗岩残积土遇水膨胀及崩解特性有关。 展开更多
关键词 微观层析成像技术 花岗岩残积土 颗粒重建 颗粒规则化 颗粒接触
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