Analysis and Comparison of Slope-cutting Widening Schemes in Highway Reconstruction and Expansion Project Based on MIDAS Software

In this paper,the geological condition of the right-side slope of the K114+694–K115+162 section of Yong-tai-wen Expressway is investigated and analyzed with the results showing that the strength of rock mass is the main contributor to the stability of the slope.Then,two widening schemes are proposed,which are the steep slope with strong support and the gentle slope with general support schemes.The static/slope module of MIDAS GTS finite element analysis software and the strength reduction method were used to compare the two schemes.The results show that the steep slope with a strong support scheme has obvious advantages in land requisition,environmental protection,and safety and is more suitable for reconstructing and expanding the highway slope.

Photo-promoted rapid reconstruction induced alterations in active site of Ag@amorphous NiFe hydroxides for enhanced oxygen evolution reaction

The dynamic surface self-reconstruction behavior in local structure correlates with oxygen evolution reaction(OER)performance,which has become an effective strategy for constructing the catalytic active phase.However,it remains a challenge to understand the mechanisms of reconstruction and to accomplish it fast and deeply.Here,we reported a photo-promoted rapid reconstruction(PRR)process on Ag nanoparticle-loaded amorphous Ni-Fe hydroxide nanosheets on carbon cloth for enhanced OER.The photogenerated holes generated by Ag in conjunction with the anodic potential contributed to a thorough reconstruction of the amorphous substrate.The valence state of unsaturated coordinated Fe atoms,which serve as active sites,is significantly increased,while the corresponding crystalline substrate shows little change.The different structural evolutions of amorphous and crystalline substrates during reconstruction lead to diverse pathways of OER.This PRR utilizing loaded noble metal nanoparticles can accelerate the generation of active species in the substrate and increase the electrical conductivity,which provides a new inspiration to develop efficient catalysts via reconstruction strategies.

Analysis of Roadbed Pavement Designs for Highway Reconstruction and Upgrading

This paper focuses on the route and roadbed pavement design in highway reconstruction and upgrading projects.It discusses the importance of project design for highway reconstruction and upgrading,highlighting key aspects of route design and roadbed pavement design.The analysis reveals that the main design considerations in these projects include controlling factors of route reconstruction,expansion,and upgrading,as well as route plan design and longitudinal section design combined with roadbed pavement.In roadbed pavement design,it is crucial for designers to thoroughly collect existing data and make reasonable use of the current roadbed and pavement to develop a comprehensive design scheme.This analysis aims to provide a reference for the reasonable design of such projects.

Measures for the Optimization of Subgrade and Pavement Design in the Reconstruction and Expansion of Highways

In comparison to the construction of modern highway engineering,several of China’s early pavement construction concerns,such as pavement collapse,are rather clear.Limited by historical and technical factors,the subgrade and pavement design for highways lacks scientificity,thus inducing potential safety problems in the operation.In order to comprehensively improve the subgrade and pavement design as well as ensure the quality and safety of highway engineering projects,this paper takes the reconstructed and expanded highway projects as research subjects and focuses on proposing optimization measures for the subgrade and pavement design of reconstructed and expanded highways,so as to provide adequate reference.

A rapid micro-magnetic resonance imaging scanning for three-dimensional reconstruction of peripheral nerve fascicles

The most common methods for three-dimensional reconstruction of peripheral nerve fascicles include histological and radiology techniques. Histological techniques have many drawbacks including an enormous manual workload and poor image registration. Micro-magnetic resonance imaging（Micro-MRI）, an emerging radiology technique, has been used to report results in the brain, liver and tumor tissues. However, micro-MRI usage for obtaining intraneural structures has not been reported. The aim of this study was to present a new imaging method for three-dimensional reconstruction of peripheral nerve fascicles by ~1T micro-MRI. Freshly harvested sciatic nerve samples from an amputated limb were divided into four groups. Two different scanning conditions（Mannerist Solution/GD-DTPA contrast agent, distilled water） were selected, and both T1 and T2 phases programmed for each scanning condition. Three clinical surgeons evaluated the quality of the images via a standardized scale. Moreover, to analyze deformation of the two-dimensional image, the nerve diameter and total area of the micro-MRI images were compared after hematoxylin-eosin staining. The results show that rapid micro-MRI imaging method can be used for three-dimensional reconstruction of the fascicle structure. Nerve sample immersed in contrast agent（Mannerist Solution/GD-DTPA） and scanned in the T1 phase was the best. Moreover, the nerve sample was scanned freshly and can be recycled for other procedures. MRI images show better stability and smaller deformation compared with histological images. In conclusion, micro-MRI provides a feasible and rapid method for three-dimensional reconstruction of peripheral nerve fascicles, which can clearly show the internal structure of the peripheral nerve.

Safety Management Strategies for Cross-railway Interchange Widening Project in Highway Reconstruction and Extension

Under the background of rapid social and economic development,the traffic volume of highways has increased,which has brought tremendous pressure to the old highways.In response to this situation,the original highway must be reconstructed and extended.It is necessary to focus on the analysis and exploration of the methods of interchange reconstruction and extension in current highway reconstruction and extension to avoid affecting normal traffic,as it will inevitably have an impact on the traffic operation environment.For this situation,it is necessary to analyze and understand the format and characteristics of traffic organization of the interchange operation area in time and propose corresponding safeguard measures.

Settlement Control Standards of Construction and Expansion for Mountainous Highway Roadbeds

This article analyzes the differential settlement of new and old roadbeds after widening and its characteristics based on a highway reconstruction and expansion project case study.The research proposes a subgrade settlement control standard that states that the maximum differential settlement value should be less than 5 cm when the embankment fill height exceeds 20 m.Similarly,the maximum differential settlement value should be less than 10 cm when the embankment fill height does not exceed 20 m.The findings of the study can provide a useful reference for the design of roadbed widening in highway reconstruction and expansion projects.

基于快速康复外科理论的多维度康复护理对乳腺癌乳房再造术患者术后的恢复效果影响

目的分析基于快速康复外科理论的多维度康复护理对乳腺癌乳房再造术患者术后的恢复效果的影响。方法选取我院2022年4月至2023年4月收治的80例乳腺癌乳房再造术患者,采用随机数字表法分为对照组和试验组,每组40例,对照组采用常规康复护理干预,试验组采用基于快速康复外科理论的多维度康复护理,对比两组乳腺癌乳房再造术患者恢复效果心理危机水平和家庭功能、自我效能评分以及睡眠质量水平改善情况、并发症发生率。结果试验组外形、外观、手感等恢复效果评分均高于对照组(P<0.05)。两组乳腺癌乳房再造术患者护理前情感、行为、认知等心理危机水平和家庭功能、自我效能评分以及睡眠质量相比,差异无统计学意义(P>0.05);护理后两组情感、行为、认知等心理危机水平和家庭功能、自我效能评分以及睡眠质量均比护理前改善(P<0.05),且试验组乳腺癌乳房再造术患者情感、行为、认知等心理危机水平和家庭功能、自我效能评分以及睡眠质量改善程度比对照组更优(P<0.05)。试验组乳头挛缩、愈合不良、局部疼痛、皮下血肿等并发症发生率低于对照组(P<0.05)。结论基于快速康复外科理论的多维度康复护理对乳腺癌乳房再造术患者术后的恢复效果提升具有积极的影响,有利于改善患者的不良心理,提高患者自我效能、家庭功能以及睡眠质量。

基于三维重建的飞机气动特性快速评估

为了快速确定目标飞机的气动特性,提出一种基于三维重建的高效数值计算方法。三维重建综合正交投影视图的信息,提取特征点线,采用NURBS方法构建曲面,将实体飞机模型数字化。气动特性快速评估基于Euler方程,结合GPU并行技术,可显著提升计算效率,通过开展亚跨超等不同速域的标模计算,验证了方法的准确性。针对某三翼面布局的飞机案例,开展了逆向重构和气动特性分析,结果表明:三维重建的效果较好,数值分析的效率较高,验证了方法具有较好的工程实用性。

基于逆向工程的摩托车挡泥板的快速成型

以挡泥板为研究对象,运用逆向工程和快速成型技术,详细展示了其整个重构设计和快速成型过程。通过三维激光扫描设备进行实物数据采集,然后将点云数据导入Geomagic wrap软件进行处理,接着,利用Geomagic DesignX软件进行模型重构,最终,通过3D打印技术得到了与原件契合度较高的挡泥板样品。采用逆向工程设计的挡泥板能够显著缩短产品的设计研发周期,提高效率。本文的研究结果对其他产品的设计研发具有一定的参考价值。

海口市南海大道快速提升改造策略研究

南海大道作为海口市贯通东西的空间发展轴心,是海口市“四横八纵”骨干路网中重要的横向干道。通过时间、空间两个维度,路网结构、转换条件、功能定位、快速系统四个思考,得出南海大道需要的是一定程度上的快速化而非快速路,提出了南海大道西段“修复”、中段“提升”、东段“贯通”的总体改造策略,有效控制建设规模和投资,形成一定程度上快速化的东西向大通道。

核心区功能性训练应用于前交叉韧带损伤重建术后功能恢复的临床观察

目的 探讨核心区功能性训练在前交叉韧带损伤重建术后膝关节功能恢复过程中的作用。方法 将32例2020年7月至2022年7月在青岛滨海学院附属医院首次行关节镜下前交叉韧带重建术的患者按照就诊顺序用随机数字表分为传统康复组和功能训练组两组。传统康复组按常规标准进行围术期管理以及术后常规康复指导,功能训练组在传统康复组基础上添加核心区功能性训练。分别在术前、术后2周及术后1个月时对患者的膝关节Lysholm评分,术后1个月等速仪(Biodex S4)屈伸肌峰力矩比值测定、本体感觉综合评分以及患者对康复计划的满意度等进行评定,并统计分析。结果 两组术前的Lysholm评分差异无统计学意义(P>0.05),术后2周功能训练组的Lysholm评分(28.31±4.59)分,显著高于传统康复组(21.38±3.54)分,两组间差异有高度统计学意义(P<0.001)。术后1个月时,功能训练组的Lysholm评分(79.75±2.79)分、屈伸肌峰力矩比值(0.43±0.05)以及满意度(3.88±0.34)分高于传统康复组(69.56±4.69)分、(0.39±0.05)、(3.38±0.50)分,其平均轨迹误差(54.69±5.12)%低于传统康复组(65.00±7.05)%,且差异均有统计学意义(P<0.05)。结论 系统的核心区功能性训练可以短期内有效促进前交叉韧带损伤重建术后膝关节功能的恢复。

Using portable falling weight deflectometer to determine treatment depth of subgrades in highway reconstruction of Southern China

Based on a highway reconstruction project in southern China,this study aims to put forward a method to determine the proper treatment depth of the existing subgrade.First,some field tests including the Beckman beam deflection test and portable falling weight deflectometer(PFWD)test were carried out.The results showed that there was a good correlation between the Beckman beam deflection(L)and PFWD modulus(Ep).Subsequently,a subgrade section was excavated and backfilled with cement-stabilized soil in layers.Compaction test,dynamic cone penetrometer rate test,plate load test and Beckman beam deflection test were performed to evaluate the treatment effect.To make sure,the subgrade was treated deeply enough,the Beckman beam deflection(L)was used as the controlled indicator among all the measured indexes for it was the hardest metric to meet.According to the design deflection and decreasing law of the measured deflections with the different number of the stabilized layers,the treatment depth was finally determined.As the PFWD test is superior to the deflection test in the detection efficiency,and the deflection value can be calculated from PFWD modulus by correlation formulas,thus the latter index can be used as a more suitable parameter for estimating the treatment depth instead of the former.Consequently,based on the measured PFWD moduli of the existing subgrade,six treatment schemes considering different treatment depths were proposed.It was confirmed that the method developed from this study is feasible and worth being extensively applied.

城市主干路地下快速化改建后的街道景观更新设计研究

文章系统论述了城市主干路地下快速化改建后的街道更新思路与专业需求,并以上海市普陀区武宁路(真北路-长寿路)景观提升工程为例,遵循以人为本的设计初心,基于“城市意象”理论,结合“道路、边界、区域、节点和标志物”5种要素,梳理了街道景观更新设计策略。针对城市主干路地下快速化改建后的景观更新特点,从绿化更新、竖向设计、人行铺装、沿线绿地空间等方面总结了多专业综合视角下的街道景观更新设计要点。

金海路快速化改建工程施工期间交通组织方案研究

与地铁共线的城市交通复合廊道通常存在交通流量大、交通参与者多、交通组织复杂等特征,为降低在此类道路项目改建施工期间,因施工翻交对既有交通组织及周边居民出行的影响。首先,总结归纳相关学者对此类问题的研究成果,梳理施工交通组织基本原则及设计要点;其次,以金海路快速化改建工程为例,提出该项目交通组织方案重难点在于如何结合工程永久设计方案及区域交通出行特征合理组织交通,并以此为约束条件提出施工交通组织方案;最后,采用BIM建模技术及倾斜摄影技术,建立金海路快速化改建工程施工期间交通组织模型,通过航拍摄片直观展示并验证施工交通组织方案的可行性。

蚌埠市大庆路快速化改造总体规划方案研究

大庆路是蚌埠市快速路路网规划中的重要一纵,其快速化改造可有效改善和缓解城市片区间的交通压力。文章以大庆路改造工程为研究背景,分析功能定位,根据现状流量和规划情况推算远期交通量预测结果,论证主辅道建设规模。结合现状建设条件及交通需求,合理布置规划设计断面,对主要节点的立交形式进行确定,为类似工程的规划设计提供参考和借鉴。

快速路改建为高速路的适应性评估体系研究

以石家庄市南绕城高速公路项目为工程依托,以公路交通适应性理论为指导思想,深入研究城市快速路改建为高速公路的适应性评估体系。通过对城市快速公路既有线形与安全设施的现状进行定位和采集,创建快速公路改建为高速公路工程的适应性评估指标,构建了相应的评估体系。研究结果表明,该体系能全面、客观地评价城市快速路改建为高速公路的适应性,为同类工程提供了科学、可行的评估方法。

大块下颌骨缺损的个体化数字设计及外形与功能重建

目的利用快速成型与反求技术建立大块下颌骨缺损的外形与功能重建的方法. 方法 2002年4月～2004年8月,大面积下颌骨病变截除术后遗留大块下颌骨缺损患者4例,男1例,女3例,年龄21～42岁.均为二期修复,术前张口度1.8～2.5 cm,平均2.2 cm,均存在开闭口运动偏斜.采用CT数字化图像数据,利用Mimics图像软件和Geomagic Studio曲面重构软件镜像恢复下颌骨缺损区数据及种植体结构设计,快速成型技术制作缺损下颌骨的树脂模型,通过铸造技术制造纯钛修复支架,修复缺损重建功能. 结果术前CT扫描数据可以直接被图像设计软件使用,精密制造出缺损下颌骨的树脂模型和钛支架,并可以设计良好的种植体.术后4例患者伤口均Ⅰ期愈合,随访3个月～2年,缺损区面部外形恢复满意,开口度3.0～3.4 cm,平均3.2 cm.咬牙合关系正常,开闭口功能正常无偏斜.1例术后6个月行种植义齿镶复,咀嚼功能恢复良好. 结论利用快速成型与反求技术进行个体化修复大块下颌骨缺损,方法简便,修复精确,可同时修复外形及重建咀嚼功能.

快速成型技术在临床医学中的应用

根据快速成型和医学影像技术的发展与现状 ,提出了从医疗设备直接提取数字化信息 ,利用 CAD软件及二次开发工具进行三维重建直至原型输出的新思路 ,着重探讨快速成型技术在临床医学应用中的一些关键技术 ,并提出了初步解决方法及该技术的应用前景。

面神经缺损快速延长后即刻端端吻合修复的初步临床应用

目的初步评价面神经缺损快速延长后即刻端端吻合修复的临床效果。方法2000年8月～2005年2月，收治面神经缺损患者9例。其中交通伤4例，刀砍伤及肿瘤侵及面神经各2例，跌落伤1例。7例外伤患者出现明显面瘫；受肿瘤侵犯2例，术前无明显面瘫。多支缺损8例，单支缺损1例。缺损均位于各分支的近、中1／3，范围1．5～3．0cm。2例神经电生理检查示，患侧表情肌肌电图（electromyogram，EMG）平均峰值分别等于健侧的13％和20％，动作电位潜伏期较健侧长9倍以上。手术行解剖神经后，自制神经延长器一次性弦式加载延长神经，即刻行无张力端端缝合。术后综合参照BakerDC疗效评定和House—Brackmann评级法进行疗效评价。结果术后9例患者获随访6～18个月。其中5例两侧面部动、静态表情完全对称，表情肌EMG平均峰值为健侧的82％～95％，疗效评价为优；3例动、静态表情基本对称，表情肌EMG平均峰值为健侧的60％～90％，疗效评价为良；1例表情肌功能有改善，表情肌EMG平均峰值为健侧的55％，疗效评价为差。结论面神经缺损≤3cm的情况下，快速延长后即刻行端端缝合修复神经缺损，可获较满意疗效。