紧邻地铁区间隧道基坑开挖对隧道结构的影响浅析

文章基于静、动力学有限元分析方法,建立了基坑与隧道相互作用的混合单元离散模型,分析了基坑对隧道结构力学行为的影响以及列车扰动情况下隧道结构的响应特征。研究结果表明,基坑开挖深度、基坑与隧道的距离、基坑开挖空间大小等因素对邻近既有隧道结构的静力变形和列车振动响应均有明显影响,其中卸荷规模是影响隧道位移场的重要因素。因此,可通过地基加固、优化基坑施工工艺、提高隧道结构刚度、加强隧道变形监测等措施来控制隧道结构的变形。     

港口大宗散货码头带式输送机减电机节能技术分析

鉴于港口煤炭、矿石等大宗散货码头用长距离带式输送机经常在轻载状态下运行,输送机所需要的传动功率较低,出现严重的＂大马拉小车＂现象,导致输送机能耗较高,系统功率因数较低的情况,分析了带式输送机减电机节能运行的可行性和关键技术,开发了输送机减电机运行计算软件,给出了散货码头带式输送机减电机运行的合理建议。     

基于全站仪的海洋钢结构物三维精度检测分析方法及应用

通过基于全站仪的三维精度检测分析方法的应用,实现对钢结构建造实物模型的三维整体描述,提供一种三维高精度检测分析方法。该方法能对实物模型进行整体及局部建造偏差分析,保证钢结构建造的后续工作顺利实施。开发了大型海工钢结构物建立物方基准模式及搬站测量模式,使得现场操作灵活方便。实现与建造实物模型和建造场地之间的数字化对比。     

Review on the interlimb neural coupling and its potential usage in walking rehabilitation

Human performs bipedal gait with synchronized arm swing. Apart from the observation that arm movement during gait is the outcome of a mechanical and energetic optimization, the synergetic upper and lower limb movement during gait is a neutrally coordinated motor output, that is, the interlimb movement is neutrally coupled. Patients with injuries to the central nervous system demonstrate the interlimb neural coupling. Researches on central pattern generator and the reflex studies reveal that the interlimb neural coupling is a quadrupedal heritage. Based on the theory of the interlimb neural coupling, both the upper and lower limbs should be practiced synchronously during regular gait training to promote walking rehabilitation for patients with gait disorders. Frther development of a gait robotic system with synchronized arm swing is required to test the clinical application of the neural coupling in gait restoration.     

Kinect-based automatic spatial registration framework for neurosurgical navigation

As image-guided navigation plays an important the pre-operative images with the intra-operative patient role in neurosurgery, the spatial registration mapping position becomes crucial for a high accurate surgi- cal output. Conventional landmark-based registration requires expensive and time-consuming logistic support. Surface-based registration is a plausible alternative due to its simplicity and efficacy. In this paper, we propose a comprehensive framework for surface-based registration in neurosurgical navigation, where Kinect is used to auto- matically acquire patient＇s facial surface in a real time manner. Coherent point drift （CPD） algorithm is employed to register the facial surface with pre-operative images （e.g., computed tomography （CT） or magnetic resonance imaging （MRI）） using a coarse-to-fine scheme. The spatial registration results of 6 volunteers demonstrate that the proposed framework has potential for clinical use.     

Robust and real-time guidewire simulation based on Kirchhoff elastic rod for vascular intervention training

Virtual reality （VR） based vascular intervention training is a fascinating innovation, which helps trainees develop skills in safety remote from patients. The vascular intervention training involves the use of flexible tipped guidewires to advance diagnostic or therapeutic catheters into a patient＇s vascular anatomy. In this paper, a real-time physically-based modeling approach is proposed to simulate complicated behaviors of guidewires and catheters based on Kirchhoff elastic rod. The slender body of guidewire and catheter is simulated using more efficient special case of naturally straight, isotropic Kirchhoff rods, and the short flexible tip composed of straight or angled design is modeled using more complex generalized Kirchhoff rods. We derive the equations of motion for guidewire and catheter with continuous elastic energy~ and then they were discretized using a linear implicit scheme that guarantees stability and robustness. In addition, we apply a fast-projection method to enforce the inextensibility of guidewire and catheter, while an adaptive sampling algorithm is implemented to improve the simulation efficiency without reducing accuracy. Experimental results reveal that our guidewire simulation method is both robust and efficient in a real-time performance.     

Mathematical approach for fleet planning under complicated circumstances

In order to facilitate the scientific management of large-sized shipping companies, fleet planning under complicated circumstances has been studied. Based on multiple influencing factors such as the techno-economic status of ships, the investment capacity of company, the possible purchase of new ships, the buying/selling of second-hand vessels and the chartering/renting of ships, a mixed-integer programming model for fleet planning has been established. A large-sized shipping company is utilized to make an empirical study, and Benders decom- position algorithm is employed to test the applicability of the proposed model. The result shows that the model is capable for multi-route, multi-ship and large-scaled fleet planning and thus helpful to support the decision making of large-sized shipping companies.     

广州港南沙四期工程轨道地基处理

广州港南沙港区四期工程采用自动化轨道式龙门起重机（ARMG），ARMG对地基基础的要求较高。由于原状软土厚度较大，大面积真空预压处理的地基不能满足使用要求，需要对轨道地基进行二次处理。结合工程地质条件和ARMG使用要求，通过方案比选，采用水泥搅拌桩复合地基对轨道进行二次地基处理。堆场区轨道基础采用钢筋混凝土地基梁结构+水泥搅拌桩复合地基，过路段轨道基础采用钢筋混凝土轨道板结构+水泥搅拌桩复合地基。钢筋混凝土地基梁+水泥搅拌桩复合地基方案可以满足轨道的使用要求，造价较低、过路段差异沉降较小。     

印尼爪哇电厂排水明渠水沙特征分析及防护研究

针对印尼爪哇燃煤发电工程方案的排水明渠局部潮流泥沙特征开展研究,评价了不同疏浚方案形式对Terate河渔船通航和电厂引堤冲刷的影响。基于试验数据,建议对排水导流堤、引堤堤脚进行合理防护,同时将河口外侧疏浚至-3 m,以保障渔船通航和引堤结构安全。     

中琉历史关系研究的回顾与展望

过去40年,中琉历史关系研究整理了许多的文献档案资料,这是研究工作深入推进的基础。学术的研究主要围绕中琉册封与进贡、航海与贸易、人员的移动和文化的交流展开论述。通过对现有研究存在的问题和不足的思考,进一步提出今后研究可以拓展的空间。