摘要：针对我国水资源利用效率偏低和城市洪涝灾害风险上升问题,通过实施河道疏浚、水环境修复措施,结合“海绵城市”治水理念合理积存利用涝水,采取生态防洪策略确定生态水量,实施河湖补水连通等手段,恢复了河道行洪能力,提高了防洪排涝措施对水资源保护效能。实践证明,基于水资源可持续利用理念的城市防洪体系构建可以实现城市水资源的集约利用和防洪安全的双重目标,为类似的城市新区水系重构提供新的思路和方法。

摘要：基于胶束增稠和静电屏蔽作用,以1.4%的十八烷基三甲基溴化铵(OTAB)和0.6%的椰油酰胺丙基甜菜碱(CBA)复配作为主剂,0.7%水杨酸钠和0.5%氯化钾作为反离子助剂,0.05%疏水纳米二氧化硅作为增强剂,构建了压裂-采油一体化压裂液体系。该体系由蠕虫状胶束构成的三维网络空间结构组成,在80℃、170 s^(-1)下表观黏度为57 mPa·s,剪切3000 s后,表观黏度保留率大于95%;80℃下携砂沉降速率为0.24 mm/s,滤失系数为1.6×10^(-4)m/min^(1/2),具有良好的压裂特性。岩心驱替实验表明,体系破胶液岩心伤害<10%,提高采收率效果达到16.1%。一体化压裂液体系为高效开发非常规油藏提供了一个潜在可行的技术方案。

摘要：目的基于MemTrax迈睦睿记忆测量程序探讨慢性失眠患者失眠严重程度的相关因素。方法选取广东省中医院治未病中心自2024年4月至2024年9月收治或院内广告招募的220例慢性失眠(每周失眠≥3 d,病程≥3个月)患者为研究对象,采用匹兹堡睡眠质量指数(PSQI)量表评估患者近1个月的睡眠质量,根据PSQI评分将患者分为轻度失眠组(7~10分)、中度失眠组(11~15分)、重度失眠组(16~21分)。采用MemTrax迈睦睿记忆测量程序评估患者的认知记忆功能,采用患者健康问卷-9(PHQ-9)、广泛性焦虑障碍-7(GAD-7)量表评价患者近2周的抑郁、焦虑程度。比较不同程度慢性失眠患者临床资料、MemTrax测试结果和PHQ-9、GAD-7评分的差异。采用Spearman秩相关性检验分析慢性失眠患者失眠严重程度与认知记忆功能等临床资料的相关性。结果220例慢性失眠患者中,轻度、中度、重度失眠患者分别为54、111、55例。与轻度、中度失眠组患者比较,重度失眠组患者中年龄>50岁者占比较高,使用安眠类药物者占比较高,差异均有统计学意义(P<0.05)。重度失眠组患者图片识别正确率[84%(78%,92%)]低于轻度、中度失眠组患者[90%(86%,94%)、88%(82%,94%)],MemTrax综合指数(76.69±17.43)低于轻度、中度失眠组患者(88.55±18.67、84.41±20.93),PHQ-9评分[12(8,16)分]高于轻度、中度失眠组患者[9(6,11)分、9(6,15)分],差异均有统计学意义(P<0.05);与轻度失眠组患者比较,重度失眠组患者图片识别反应时间较长[1.04(0.90,1.15)s比1.11(1.03,1.24)s],GAD-7评分较高[6(3,9)分比7(5,13)分],差异均有统计学意义(P<0.05)。相关性分析结果显示慢性失眠患者的失眠严重程度与年龄、PHQ-9评分、GAD-7评分、图片识别反应时间呈正相关关系(P<0.05),与图片识别正确率、MemTrax综合指数呈负相关关系(P<0.05)。结论慢性失眠患者的失眠严重程度与年龄、认知记忆功能、抑郁焦虑程度有关。

摘要：由于烟叶成熟期不同,需分批次进行选择性采摘,即成熟一片采一片,这一过程所需人力、物力消耗过大。为解决上述问题,设计了一种剪切夹持一体化的末端执行器,并基于叶片根部特性加入了一种柔性夹持体,对2个夹爪剪切和夹持稳定性做受力分析,在SolidWorks Simulation中对刀片等关键部位结合有限元分析理论做应力分析,对两爪的夹持做力封闭性分析,最后将SolidWorks模型导入ADAMS中对其进行仿真模拟。受力和仿真模拟数据分析得出所施加的剪切力能有效切断叶茎且不会对其造成不必要损伤,且末端执行器设计符合力封闭原理,确保了夹持过程的稳定性与可靠性;刀片在操作过程中所承受的应变力符合作业需求标准,具有足够的耐用性和稳定性。同时,尽管仿真环境中无法完全复现实际材料的所有物理特性,导致数据在某些细节上可能存在轻微波动,但总体趋势与预期相符,充分验证了采摘机械手仿真模拟的有效性和实际应用中的可行性。

摘要：农光互补光伏作为光伏产业新的发展方向,当前正处于提速发展阶段,然而针对农业光伏桩基础水平承载特性的研究尚不深入。为此,依托某农光互补光伏电站桩基工程,采用低应变法开展典型桩基桩身完整性的检验。而后借助单桩水平静载荷试验,获得桩顶水平位移与荷载关系曲线,在此基础上,进一步得到了地基土水平抗力系数与水平荷载、桩顶水平位移的关系曲线。研究成果可为类似光伏桩基础的设计提供参考和借鉴。

摘要：Factors for determining the spindle size are the shaft diameter, positions of bearing and motor, and entire length of the spindle. Then, it is important to find the assembling of the optimal design variables, which satisfy the stiffimss and rotational speed required to the spindle. A general full factorial design method was used to verify some factors that affect the natural frequency of a spindle. It is verified that the shorter shaft length and bearing span length represent the higher natural frequency, and there are some effects according to the change in the levels of factors. The detailed spindle dimension is determined by applying an EVD method, which can define the optimal bearing position through considering the limiting condition. Based on the estimated regression model, the optimal spindle size and bearing distance that can improve the primary natural frequency are obtained, and the influence of design factors on the natural frequency is also analyzed.

摘要：Aiming to maximize the aerodynamic performance of the Distributed Electric Propulsion(DEP)aircraft,a hybrid design framework which focuses on the aerodynamic performance of the propeller/wing integration has been developed and validated ***-fidelity modelling for propeller aerodynamics has been used to achieve computational efficiency with reasonable *** optimizing the aerodynamic loading distributions on the tractor propeller disk,the induced slipstream is redistributed into a form that is beneficial for the wing downstream,based on which the propeller blade geometry is generated through a rapid inversed design *** compared with the Minimum Induced Loss(MIL)propeller at a specified thrust level,significant improvements of both the lift-to-drag ratio of the wing and the propeller/wing integrated aerodynamic efficiency is achieved,which shows great promise to deliver aerodynamic benefits for the wing within the propeller slipstream without any additional devices.

摘要：为研究文物元素在现代产品设计中的应用,从工业设计出发,提出基于设计符号学的文物元素再造研究方法.分析产品设计中的文化融入,以及文物元素再造现状,提出文物元素的设计符号学解读模型,包括语意、语构、语用和语境4个维度.提出基于设计符号学的文物元素再造内容、方法、流程和关键技术,以浙江省博物馆的典型瓷器为例,初步构建"文化元素再造创意设计系统";以"定窑划花缠枝莲纹葵瓣口碗"的再造为例进行验证,包括文物元素提取与整理、基于设计符号学的文物元素设计知识库构建以及文物元素再造3个部分,为文化创意产业和文博研究提供参考.

摘要：To enhance machining efficiency,tool change time has to be ***,for an automatic tool changer attached to a machining center,the tool change time is to be *** the automatic tool changer is a main part of the machining center as a driving *** static attributes of the automatic tool changer using the commercial code,ANSYS Workbench V12,were tried to *** the optimum design of automatic tool changer arm was proposed by performing the multi-stage optimum *** shape optimization of the automatic tool changer was proposed and the result was verified to obtain acceptable *** is possible to obtain an optimized model in which the maximum deformation,maximum stress,and mass are reduced by 10.46%,12.89% and 9.26%,respectively,compared with those of the initial ***,the results between conventional method by the design of experiments and proposed method by the multi-stage optimum design method were compared.

摘要：瘤胃是反刍动物特有的消化器官,其错综复杂的微生物区系在整个消化过程中扮演核心角色,通过一系列厌氧代谢途径对饲料中的有机物质进行降解,同时生成甲烷(CH_(4))。作为一种强效温室气体,CH_(4)的产生不仅导致能量的损失,还会加剧全球气候变暖。因此,寻找更多更有效的措施来抑制瘤胃CH_(4)排放对于提高动物生产性能及缓解气候变化具有重要意义。瘤胃微生物和饲粮营养是影响反刍动物CH_(4)排放的两大因素。文章阐述了产甲烷菌、细菌、原生动物和厌氧真菌在瘤胃CH_(4)生成过程中发挥的作用,归纳总结了调整饲粮组成、添加化学抑制剂、植物性饲料添加剂和直接饲喂微生物等方法在降低CH_(4)排放方面的作用效果,为反刍动物CH_(4)减排策略的实施与应用提供参考。