摘要：This research proposes a novel three-dimensional gravity inversion based on sparse recovery in compress sensing. Zero norm is selected as the objective function, which is then iteratively solved by the approximate zero norm solution. The inversion approach mainly employs forward modeling; a depth weight function is introduced into the objective function of the zero norms. Sparse inversion results are obtained by the corresponding optimal mathematical method. To achieve the practical geophysical and geological significance of the results, penalty function is applied to constrain the density values. Results obtained by proposed provide clear boundary depth and density contrast distribution information. The method's accuracy, validity, and reliability are verified by comparing its results with those of synthetic models. To further explain its reliability, a practical gravity data is obtained for a region in Texas, USA is applied. Inversion results for this region are compared with those of previous studies, including a research of logging data in the same area. The depth of salt dome obtained by the inversion method is 4.2 km, which is in good agreement with the 4.4 km value from the logging data. From this, the practicality of the inversion method is also validated.

摘要：结合兴城深部探测野外实验示范基地地学信息特征分析,构建了基于地理空间关联性的面向对象数据储存模型。在此基础上,利用电子地图和数据库技术设计并实现了基于Google Earth的兴城地学信息共享系统,实现了对兴城基地地学信息的统一管理与共享,为基地内勘探工程设计和勘探结果分析比对提供信息服务支持。

摘要：介绍了以单片机(MCU)为核心处理器的测控设备与上位机进行通信的实现过程,详细分析了Modbus通信协议。采用Proteus软件对测控设备的外围电路进行设计,并用虚拟串口驱动(VSPD)将Proteus与上位机虚拟链接,实现通讯仿真。它无需建立物理模型,节约了开发成本,有效提高开发效率,为智能测控设备的开发提供了参考。

摘要：船舶航行时,受到风浪影响产生的横摇运动会使船体摇晃。当倾斜角偏大,对于船体稳定性和安全性影响较大。减摇鳍控制技术上传统PID不具备自整定的能力,缺乏在不同海况下的适应性及调节能力,减摇作用与控制效果较差。将模糊控制与PID相结合,同时引入免疫调节,优化PID控制参数,免疫控制能形成有效的反馈,结合模糊和免疫二者优点,设计减摇鳍模糊免疫控制系统,并在Matlab中进行了仿真。结果表明,fuzzy-immune对海浪影响下的船舶横摇有很好减摇控制效果。

摘要：根据辊锻设计要求,论述了汽车前轴辊锻件的弹簧座截面、工字型截面、两端拳头截面各道次变化规律;在各道次变化过程中,依据各截面的尺寸参数变化对辊锻模具进行精确设计并选择合理的坯料,以保证坯料能够充满模具型槽。应用Deform-3D软件对辊锻模具模型进行模拟分析,模拟结果与实际生产结果相吻合,进一步验证了辊锻模具设计的准确性和可靠性。该文的论述对前轴辊锻模具的精确设计及辊锻件的生产提供了理论参考依据。

摘要：针对目前地学岩心信息管理系统的共享程度和可扩充性低,以及不能方便直观地查看岩心采样信息的问题,提出了基于Web兴城地学岩心库系统,采用MVC框架和数据库技术,并与GoogleEarth结合,实现了对兴城岩心信息的快速查询和有效管理,提高了系统的共享程度和可扩充性,并可以在GoogleEarth中直观地查看岩心采样的信息,实现了资源的信息化,为兴城基地内的地质勘探、岩性等提供服务和支持。

摘要：简述了机件上常见深孔的铰削工艺及所用的刀具。包括切削用量、冷却润滑、装夹要点以及铰刀的设计原理、结构组成、刀具的加工、安装和调整、刀具的容屑排屑等实施方法。

摘要：数字波束合成技术是相控阵超声检测相对于其它超声检测所特有的,也是整个信号接收处理系统的核心技术。通过设计基于可编程现场门阵列(FPGA)的各个模块,充分利用FPGA的优点,实现了精确延时和快速加权求和。从而可以对回波信号在不同方向和深度进行动态聚焦,很好地实现了波束的数字合成。

摘要：为提高目标检测模型的对抗鲁棒性,提出一种融合图像去噪和特征对齐的目标检测算法(target detection algorithm with image denoising and feature alignment,TDA-IDFA)。采用坐标注意力机制对图像去噪结构进行改进,在去除图像噪声的同时强化图像细节和边缘信息;结合特征对齐对抗训练方法,训练不仅鲁棒而且准确的目标检测模型,在提升目标检测模型对抗鲁棒性的同时,平衡模型对干净样本和对抗样本的识别精度;使用不同的对抗攻击方法,针对多种算法展开对比实验。实验结果表明,所提算法在PASCAL VOC和MS-COCO数据集的对抗鲁棒性比现有算法分别平均提高了9.75%和8.72%。

摘要：Engineering shallow,large-span rock tunnels challenges deformation control and escalates construction *** study investigates the excavation compensation method(ECM)and its associated technologies to address these *** five key technologies,the ECM effectively modulates radial stress post-excavation,redistributes stress in the surrounding rock,and eliminates tensile stress at the excavation ***-tensioning measures further enhance the rock’s residual strength,establishing a new stability *** tests corroborate the method’s effectiveness,demonstrating a crown settlement reduction of 3–8 mm,a nearly 50%decrease compared to conventional construction ***,material consumption and construction duration were reduced by approximately 30%–35%and 1.75 months per 100 m,***,the ECM represents a significant innovation in enhancing the stability and construction efficiency of large-span rock tunnels,marking a novel contribution to the engineering field.