数字减影血管造影在诊治顽固性鼻出血中的应用

目的探讨数字减影血管造影技术在诊治顽固性鼻出血中的应用价值。方法6例顽固性鼻出血患者使用常规方法止血治疗无效后,采用Seldinger技术经皮穿刺法做右侧股动脉穿刺行数字减影血管造影,查明出血部位及责任血管后施行超选择性血管内栓塞治疗。结果6例患者中5例栓塞同侧颌内动脉一次止血治疗成功,另1例经加栓同侧面动脉及对侧颌内动脉而治愈。结论数字减影血管造影是诊断与治疗顽固性鼻出血的一种有效方法。     

应用DITI对中医经络学再认识

目的:应用Digital Infrared Thermal Imaging(简称DITI)红外热像技术探讨针灸一经络原理。方法:选择40名健康志愿者,随机分组为内关穴组、公孙穴组、非内关穴组、非公孙穴组四组,分别在相同条件下相应穴位及非穴位针刺;选用目前国际上比较先进的DITI红外热像仪,在针刺前、针刺即刻,持续行针10 min,留针20～30 min后分别测定脘腹部温度变化,针刺前后各组温差(△T)数据统计处理。结果:内关及公孙穴组针刺前后脘腹部温度差(△T)有统计学意义(P<0．05);而另两组非穴位对照组则没有统计学意异。结论:中医经络腧穴学中八脉交会穴理论中内关、公孙两穴对脘腹部能量有协同调节作用。     

1995～2004年广东省医院管理研究文献量的统计分析

引用中国生物医学光盘数据库(CBMdisc)收录全国及广东省十年间医院管理发表的文献量、全国10大城市医院管理的文献量排名和广东省内21个省市级医院发表医院管理文献量排名等进行统计分析,并且提出建议。     

双机容错技术在图书馆网络中的应用研究

介绍了双机容错技术的原理及其在图书馆中的应用，详细说明了双机互备援模式和双机热备份模式的双机客错模式及图书馆中常采用的系统数据镜像技术和共享磁盘技术这两种双机容错方案。     

Digital cutting guide and endoscopically-assisted vertical ramus osteotomy to treat condylar osteochondroma: a long-term study

We have introduced an effective treatment for mandibular condylar osteochondroma with a digital cutting guide and endoscopically-assisted vertical ramus osteotomy (VRO). Eleven patients with unilateral condylar osteochondroma, who did not require orthognathic surgery or had less than 3 mm deviation of the chin and a stable occlusion, were treated during the period April 2013–January 2017 with a digital cutting guide and endoscopically-assisted VRO. Clinical data collected included the occlusion, facial contour, and maximum mouth opening (MMO). Computed tomographic (CT) scans were taken before and after operation. Two patients also had additional shaping of the mandibular contour. The pathological diagnosis was confirmed to be osteochondroma in all cases. A mean (range) 19 (12–40) months of follow-up for all 11 cases showed stable postoperative occlusion and facial aesthetics. There were no functional disturbances, recurrence, or condylar absorption. VRO is an alternative to orthognathic surgery for patients with osteochondroma who do not have severe malocclusions. The digital cutting guide and endoscopically-assisted VRO make it possible to achieve precise resection of the tumour and maintain the occlusion with minimal invasion.     

Disturbance caused by varying propagation delay in non-occluding hearing aid fittings

The disturbance caused by various short propagation delays to the perception of external sounds and own voice for a non-occluding hearing aid was investigated. Ten normal-hearing and 10 mildly hearing-impaired individuals listened to external sounds and their own voice while wearing non-occluding devices providing 10dB of linear gain. Participants rated the disturbance caused by delays of 2, 4 and 10ms to music, running speech, and their own voices. The results indicated greater disturbance for the longest delay for both subject groups when judging own voice, with the ratings of the hearing-impaired participants being lowest. Normal-hearing participants also judged the 10-ms delay as more disturbing for the external sounds. Owing to the listening conditions with constant gain from 800Hz and above, the results apply directly only to this experiment. Disturbance ratings for all delays were low, which suggests that any of those tested would be acceptable for this application.     

Evaluation of the optimal exposure settings for occlusal photography with digital cameras

Background and objectiveRecently, there have been produced several kinds of camera systems, lighting devices and image processing programs. The intraoral photographs are periodically required in pediatric dentistry, since the oral environment of children changes rapidly and dramatically because of disease, growth, and tooth eruption. However, the suitable settings for intraoral digital imaging have not yet been reported. In this study, single-lens reflex and mirrorless cameras were used with a ring flash, ring light emitting diode (LED), or standard fluorescent lamp to determine the optimal exposure parameters for occlusal photography.Materials and methodsFifty-six dentists evaluated images of a discolored nonvital central incisor and first molar with recurrent caries and stained fissures clipped from a low-magnification photograph of the adult maxillary occlusal surface reflected in a mirror by using various F-numbers (representing aperture), shutter speeds, and International Organization for Standardization (ISO) numbers (representing light sensitivity).ResultsThe results showed that F-numbers between 5.6 and 10, shutter speeds faster than 1/30s, and ISO 800 produce the best occlusal images when a 60 mm f/2.8 Macro lens is used. Better images are obtained with ring LED than with ring flash. Furthermore, ISO 3200 is required for low-magnification photography in natural light. Finally, intraoral digital images should be captured under low magnification, because tilted or deflected images can be adjusted by using imaging software.     

Friendship 2.0: Adolescents' experiences of belonging and self-disclosure online

This study explores the role that digital media technologies play in adolescents' experiences of friendship and identity. The author draws on findings from in-depth interviews with 32 adolescents (15 girls, 17 boys) ages 13–18 (M = 15.5 years) attending one of seven secondary schools in Bermuda. The adolescents were asked to describe the nature of their online exchanges with friends and the value they ascribe to these conversations. A thematic analysis of their responses revealed that online peer communications promote adolescents' sense of belonging and self-disclosure, two important peer processes that support identity development during adolescence. At the same time, the unique features of computer-mediated communication shape adolescents' experiences of these processes in distinct ways. Gender and age differences show that adolescents' online peer communications are not uniform; the characteristics that distinguish adolescents offline also shape their online activities.     

中国学术期刊网络首发论文撤回状况的调查分析——以中国知网2017—2019年数据为例

【目的】 了解我国学术期刊网络首发论文出版后的撤稿及更正状况,以及问题论文撤回过程中《中国知网网络出版文献出版状态变更与内容更正规范》(以下简称《规范》)的执行情况。 【方法】 首先,检索CNKI平台2017—2019年带有“撤回”标记的网络首发论文的撤回声明;其次,下载撤回声明并编码保存,将撤回论文的目录导出至参考文献管理软件Endnote X9进行相关统计,将撤稿声明的文本导入到质性研究数据分析软件NVivo 12 Plus进行原因分类;最后,对网络首发撤稿论文的学科分布、来源期刊、撤回原因等进行分析。 【结果】 2017—2019年CNKI共撤回网络首发论文389篇,其中“撤回”论文310篇,“撤稿”论文74篇,“勘误”论文5篇;有明确撤回原因的论文有278篇,占比为71.47%,111篇没有说明撤回原因,占比为28.53%;因学术不端、署名问题、出版管理、质量控制、其他等原因撤回的论文分别为32、25、82、118、21篇。 【结论】 网络首发论文撤回率偏高(389/182654,0.21%),《规范》执行率偏低(6/389,1.54%);撤稿原因不明确、不具体,且存在故意遮掩学术不端事实的现象。学术期刊编辑出版单位和数字化出版平台应进一步规范网络首发论文的流程管理和内容审核,增强撤回原因的透明性、撤回声明的易见性和撤回过程的可回溯性。