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。     

实验动物和脏器标本的摄影方法

文章结合实践介绍了实验动物和脏器标本的摄影方法及注意事项,为从事这方面工作的科技人员提供了技术支持。     

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。     

乳腺钼靶摄影中钙化对乳腺疾病的诊断价值分析

目的：探讨乳腺摄影中各种钙化形式对乳腺疾病的诊断价值。方法：采用美国GE公司生产乳腺机800T进行轴位（CC位）、斜位（MLO位）摄影。结果：经手术或活检病理证实在乳腺钼靶摄影中所见钙化118倒，其中良性钙化72例，多表现为粗大、空泡、团块状。恶性钙化46例，多表现为细沙、针尖、小叉、小杆状。结论：钙化发生部位、钙化形态、数目、密度等对乳腺疾病正确诊断具有重要意义。     

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.