关节镜下保留二头肌肌腱转位固定术治疗巨大肩袖撕裂的疗效分析

目的研究关节镜下保留二头肌肌腱转位固定术治疗巨大肩袖撕裂。方法 2014年1月—2017年5月对39例巨大肩袖撕裂患者施行保留肱二头肌长头腱的肌腱转位固定术。术前与术后6个月进行ConstantMurley肩关节评分、加利福尼亚大学洛杉矶分校(UCLA)肩关节评分。结果患者手术顺利,术前ConstantMurley肩关节评分为(28.07±7.48),UCLA肩关节评分为(17.8±2.6);术后6个月随访Constant‐Murley肩关节评分为(72.02±6.38),UCLA肩关节评分为(30.5±2.4)。术后Constant-Murley肩关节评分、UCLA肩关节评分与术前比较,差异有统计学意义(P <0.05)。术后患者疼痛缓解,未出现复发。结论关节镜下保留二头肌肌腱转位固定术治疗巨大肩袖撕裂临床效果满意。

微创膝关节及髋关节置换术后患者疼痛分析

目的探讨微创人工膝、髋关节患者手术后疼痛及疼痛不良反应的差异。方法采纵贯式研究设计方式,以该院骨科150例接受人工膝、髋关节置换术患者为研究对象,分为全人工膝关节置换术(TKR)及全人工髋关节置换术(THR)两组。以结构式问卷、疼痛评估纪录包括疼痛影响项目及视觉模拟评分量表(VAS),收集术后3 d疼痛评估资料并进行分析。结果术后疼痛程度及疼痛不良反应发生率均随时间增加而降低(P<0.05);TKR组患者手术后疼痛程度高于THR组患者;MIS(微创)术式患者疼痛程度虽于术后24 h高于传统术式,但术后48和72 h疼痛程度已明显低于传统术式,MIS(微创)术式患者术后疼痛程度较低。两组患者疼痛的最主要不良反应均为不敢翻身,THR组术后疼痛不敢翻身发生率高于TKR组(t=15.62,P=0.000)。结论 VAS评分能够用于THR和TKR术后患者疼痛评价,其评价结果能够协助干预THR和TKR术后患者疼痛。

Modeling and analyzing point cloud generation in missile-borne LiDAR

The missile-borne LiDAR has an essential prospect in precise guidance.However,the instability of the missile has a significant impact on the precision of LIDAR point cloud,thus modeling and analyzing the influencing factors of point cloud generation is necessary.In this investigation,the authors modeled the point cloud calculation process of missile-borne linear array scanning LiDAR under ideal conditions and analyzed the effect of position change on the fleld of view(FOV) in the course of platform motion.Subsequently,the authors summarized that the stability concerning the field of view and the target tracking are dependent on three limiting conditions.Finally,the authors derived an error formula and analyzed several typical errors in missile platform flight,including scanner error,POS error,system integration error,and platform vibration error.Based on theo retical analysis and simulation experiments,the model proposed in this papier can provide a theoretical basis for the design of the missile-borne LiDAR system and the selection of related instruments in practice.

Summed volume region selection based three-dimensional automatic target recognition for airborne LIDAR

Airborne LIDAR can flexibly obtain point cloud data with three-dimensional structural information,which can improve its effectiveness of automatic target recognition in the complex environment.Compared with 2D information,3D information performs better in separating objects and background.However,an aircraft platform can have a negative influence on LIDAR obtained data because of various flight attitudes,flight heights and atmospheric disturbances.A structure of global feature based 3D automatic target recognition method for airborne LIDAR is proposed,which is composed of offline phase and online phase.The performance of four global feature descriptors is compared.Considering the summed volume region(SVR) discrepancy in real objects,SVR selection is added into the pre-processing operations to eliminate mismatching clusters compared with the interested target.Highly reliable simulated data are obtained under various sensor’s altitudes,detection distances and atmospheric disturbances.The final experiments results show that the added step increases the recognition rate by above 2.4% and decreases the execution time by about 33%.

Speckle reduction by selective spatial-domain mask in digital holography

An improved method of using a selective spatial-domain mask to reduce speckle noise in digital holography is proposed.The sub-holograms are obtained from the original hologram filtered by the binary masks including a shifting aperture for being reconstructed. Normally, the speckle patterns of these sub-reconstructed images are different. The speckle intensity of the final reconstructed image is suppressed by averaging the favorable sub-reconstructed images which are selected based on the most optimal pixel intensity sub-range in the sub-holograms. Compared with the conventional spatial-domain mask method, the proposed method not only reduces the speckle noise more effectively with fewer sub-reconstructed images,but also reduces the redundant information used in the reconstruction process.

Plasmon-enhanced fluorescence of gold nanoparticle/graphene quantum dots for detection of Cr^(3+)ions

Graphene quantum dots(GQDs),fascinating semiconductors with stable photoluminescence(PL),have important potential applications in the fields of biology,medicine,and new semiconductor devices.However,it is still challenging to overcome the weak PL intensity.Here,we report a strategy for selective resonance enhancement of GQD fluorescence using gold nanoparticles(AuNPs)as plasmas.Interestingly,the addition of low concentration AuNP makes AuNP/GQDs exhibit significant fluorescence enhancement of 2.67 times in the visible range.The addition of high concentration AuNP leads to the formation of an excitation peak at 421 nm and selectively enhances certain radiation modes.We concluded that the main reason for the selective enhancement of PL intensity in high concentration AuNP is the transfer of generous hot electrons at high energy states from AuNP to GQD and relaxation to the ground state.The electron resonance of low concentration AuNP transfers to GQD and relaxes to lower energy levels,exhibiting an overall enhancement of PL intensity.We apply it for detection of the heavy metal ion Cr^(3+),and verify that it has a correlation coefficient of 97.36%.We believe AuNP/GQDs can be considered excellent candidates for heavy metal detection and high fluorescence bio-imaging.

Six-and five-coordinated Cr^(3+)in Ga_(2)GeO_(5) invokes tunable broadband near-infrared emission toward night-vision applications

Broadband near-infrared(NIR)light sources play a critical role in widespread applications such as advanced spectroscopy analysis and nondestructive testing.One of the most promising techniques is the fabrication of broadband NIR phosphor-converted light emitting diode(pc-LED).However,the purposeful design of a tunable ultra-broadband NIR-emitting phosphor in a single host is still a challenge.In this work,Ga_(2)GeO_(5) with two sites of six-coordinated[Ga1O_(6)]and five-coordinated[Ga2O_(5)]is chosen to host Cr^(3+),successfully producing tunable broadband NIR luminescence(680-1350 nm).It can be tuned largely from 828 to 970 nm with the full-width at half maximum(FWHM)varied from 208 to 258 nm just by simply adjusting the Cr^(3+)-doping content.The tailoring of the Cr^(3+)NIR spectral emission is ascertained to the site occupation preference and competition.The encapsulation of a prototype of NIR pc-LED with an output power of 29.5mW@390 mA is conducted for the implementation of night-vision application.This work provides a novel broadband NIR phosphor by Cr^(3+)-doping in both the sixand five-coordination field,meanwhile,further demonstrating the feasibility of discovering new host material with more than one crystallographic site for Cr^(3+)to trigger tunable broadband NIR emission.