摘要：针对现有的建筑物点云分割数据效率低、抗噪性弱等问题,提出了一种区域增长与RANSAC模型结合的点云平面分割方法,该方法以种子点的曲率、法向量及其邻域点到法平面的欧氏距离为生长约束条件,通过不断扩展种子面提取符合平面模型的初始样本点集,然后采用基于RANSAC平面拟合的稳健参数估计方法估计出高精度的平面参数。试验证明该方法具有可行性。

摘要：为建立牛冠状病毒TaqMan荧光定量PCR检测方法,根据GenBank收录的牛冠状病毒AKS-01株N基因序列(KU886219)保守区设计特异性引物和探针,构建重组质粒并进行反应条件优化、特异性试验、重复性试验以及敏感性试验,建立一种检测BCoV的TaqMan荧光定量PCR方法。结果显示,建立的牛冠状病毒TaqMan荧光定量PCR检测方法特异性、敏感性和重复性均良好。该方法BCoV重组质粒标准品在5.75×10^(7)~5.75×10^(3)copies/μL时与Ct值呈现良好线性关系,该方法对牛轮状病毒、牛传染性鼻气管炎病毒、牛病毒性腹泻病毒、牛副流感病毒3型均无交叉反应,特异性良好;该方法对BCoV重组质粒标准品最低检测限为5.75×10^(1)copies/μL;批内和批间重复性试验结果稳定,变异系数均小于2%。利用所建立的TaqMan荧光定量PCR方法对收集的132份样品进行检测,与常规PCR相比,两者符合率为96.21%,可为BCoV的临床检测和流行病学调查提供技术支持。

摘要：In actual production,deep coal mine roadways are often under typical static-dynamic coupling stress(SDCS)conditions with high ground stress and strong dynamic *** the increasing number of disasters and accidents induced by SDCS conditions,the safe and efficient production of coal mines is seriously ***,it is of great practical significance to study the deformation and failure characteristics of the roadway surrounding rock under *** this paper,the effects of different in-situ stress fields and dynamic load conditions on the surrounding rock are studied by numerical simulations,and the deformation and failure characteristics are *** to the simulation results,the horizontal stress,vertical stress and dynamic disturbance have a positive correlation with the plastic failure of the surrounding *** these factors,the influence of the dynamic disturbance is the most *** the same stress conditions,the extents of deformation and plastic failure of the roof and ribs are always greater than those of the *** effect of horizontal stresses on the roadway deformation is more notable than that of vertical *** results indicate that for the roadway under high-stress conditions,the in-situ stress test must be strengthened *** determining the magnitude of the in-situ stress,the location of the roadway should be reasonably arranged in the design to optimize the mining *** roadways that are strongly disturbed by dynamic loads,rock supports(rebar/cable bolts,steel set etc.)that are capable of maintaining their effectiveness without failure after certain dynamic loads are *** results of this study contribute to understanding the characteristics of the roadway deformation and failure under SDCS,and can be used to provide a basis for the support design and optimization under similar geological and geotechnical circumstances.

摘要：介绍了一种W频段宽带波导环行器的设计方法,通过对高阶模和双频环行器工作原理的分析,利用HFSS仿真软件优化电性能,并采用ANSYS热力学软件来校核功率容量,最终研制出的环行器主要性能为:工作频率为92~96 GHz,电压驻波比≤1.12,插入损耗≤0.5 dB,隔离度≥22 dB,功率容量≥15 W,符合毫米波器件小型化的发展要求。

摘要：针对传统的激光雷达标准ICP定位算法定位精度依赖初始值、累积误差大的问题,提出了一种基于轮式里程计、IMU和激光雷达的多传感器融合定位方案。首先通过引入激光点云单点误差模型、单个点云误差概率分布来改进标准ICP定位算法;然后基于扩展卡尔曼滤波融合轮式里程计和IMU得到较为精确的里程计数据;最后将该里程计数据作为改进ICP定位算法的解算初值。实验结果表明,该融合定位方案较单一传感器定位在准确性上有较大的提高,减少了定位误差的累积。

摘要：In the process of deep projects excavation,deep rock often experiences a full stress process from high stress to unloading and then to impact disturbance *** study the dynamic characteristics of three-dimensional high stressed red sandstone subjected to unloading and impact loads,impact compression tests were conducted on red sandstone under confining pressure unloading conditions using a modified split Hopkinson pressure *** disturbance tests of uniaxial pre-stressed rock were also conducted(without considering confining pressure unloading effect).The results demonstrate that the impact compression strength of red sandstone shows an obvious strain rate *** an approximately equal strain rate,the dynamic strength of red sandstone under confining unloading conditions is less than that in the uniaxial pre-stressed impact compression *** pressure unloading produces a strength-weakening effect,and the dynamic strength weakening factor(DSWF)is also *** results also indicate that the strain rate of the rock and the incident energy change in a logarithmic *** similar incident energies,unloading results in a higher strain rate in pre-stressed *** to the experimental analysis,unloading does not affect the failure mode,but reduces the dynamic strength of pre-stressed *** influence of confining pressure unloading on the shear strength parameters(cohesion and friction angle)is *** the same external energy impact compression,prestressed rock subjected to unloading is more likely to be ***,the effect of unloading on the rock mechanical characteristics should be considered in deep rock project excavation design.

摘要：烟草烟雾中含有上千种化学成分,涉及几十种危害人体健康的致癌物质。吸烟不仅会导致自身成瘾,损害自身呼吸系统以及神经发育,还会对被迫吸入二手烟的人群产生不良影响。因此,针对我国吸烟人数逾3亿的现状而言,寻找可行性措施以促使个体有效戒烟,降低吸烟给个体带来的健康危害,是建设“无烟中国”道路上亟须解决的重要难题。严肃游戏作为一种以教育为目的的新型干预方式,已被证明具有良好的干预效果。本文将通过研究国内外严肃游戏在戒烟干预中的应用进展,分析严肃游戏干预戒烟的形式、理论和机制等,探讨其在戒烟干预领域的应用价值与困难,为提出更具针对性的研究设计提供理论参考。

摘要：隧洞施工和持续干旱导致岩溶地区地下水位大幅下降会造成严重的生态和环境问题。因此,定量评估两种因素共同影响下的岩溶地下水系统响应有助于施工单位和居民采取有效应对措施。研究采用离散管道-连续介质耦合模型方法,建立了考虑动态施工条件下的九龙岭长隧洞工程区岩溶地下水三维数值模型,并通过工程区水文地质资料和监测钻孔水位数据对模型进行校准,用控制单一影响因素方法分别评价了在2022年8月至2022年10月隧洞施工和极端干旱两种因素对区域岩溶地下水系统的影响。结果表明,研究区域均衡期内地下水位受干旱影响范围占研究区域面积的55.43%(约649.72 km2),是隧洞施工影响的35.1倍,持续干旱是造成研究区域大面积地下水下降的主要原因;随着干旱持续,隧洞沿线整体地下水位下降受干旱影响较大,但在少量局部洞段隧洞轴线上方(如距隧洞入口14~15 km、18~19 km段)水位下降是受隧洞突涌水不同程度的影响;通过对研究区域地下水水量平衡分析发现,在均衡期内干旱影响的补给减量约为824.5万m^(3),明显多于隧洞涌水造成的地下水流失量,持续干旱对研究区域地下水的影响最大。本文阐明了在隧洞施工和干旱共同影响下岩溶地下水系统扰动的时空演变特征,研究成果可为岩溶区地下工程影响评价提供参考依据。

摘要：旨在建立一种猪细小病毒(PPV)快速准确PCR检测方法,根据PPV VP2基因的保守序列设计并合成1对特异性引物和1条特异性探针,建立了可检测PPV的TaqMan荧光定量PCR检测方法。建立的检测方法敏感性高,最低可检测8.76×10^(1)copies/μL的PPV VP2基因标准品;特异性试验结果显示,该方法检测猪流行性腹泻病毒、猪圆环病毒2型、伪狂犬病病毒、猪繁殖与呼吸综合征病毒均无交叉反应;重复性试验组内与组间变异系数均低于2%,重复性良好。用该方法检测102份临床样本,检出阳性样本16份,阳性检出率为15.69%,将检测出的阳性样本进行PCR扩增并测序,证实检测样品中确实存在PPV。该方法敏感性高、特异性强,适用于PPV的定量检测及猪细小病毒病的流行病学调查。

摘要：虽然以ChatGPT为代表的自然语言生成(NLG)大语言模型在自然语言处理中的大多数任务中取得了良好的表现,但其在序列识别任务,如命名实体识别任务中的表现暂且不如基于BERT的深度学习模型.针对这一点,本文探究性的通过将现有的中文命名实体识别问题改造成机器阅读理解问题,提出并设计了基于情境学习和模型微调的新方法,使NLG语言模型在识别命名实体达到了更好的效果,并且该方法不同于其他方法需要改变基层模型的预训练参数.同时,由于命名实体是模型生成的结果而不是对原始数据的分类,不存在边界问题.为了验证新框架在命名实体识别任务上的有效性,本文在多个中文命名实体识别数据集上进行了实验.其中,在Resume和Weibo数据集上的F1分数分别达到了96.04%和67.87%,相较于SOTA模型分别提高了0.4和2.7个百分点,从而验证了新框架能有效利用NLG语言模型在文本生成上的优势完成命名实体识别任务.