摘要：本文主要研究一种变幅折叠式吊臂的机械传动形式,分析其升降工作原理,对吊臂折叠变幅过程中可能出现的倾覆性问题提出三级吊臂同步折叠的假设,并借助ADAMS软件对其折叠变幅过程进行优化设计。

摘要：为加强副结核分支杆菌(MAP)的检测、监测与防控,建立MAP荧光定量PCR(qPCR)检测方法,根据国内MAP流行菌株特异性插入序列IS900设计1对特异性引物和探针,构建重组阳性质粒用作建立qPCR的模板,优化反应体系和条件,验证该方法的特异性、敏感性和重复性。结果显示,该方法最低检测限为5拷贝/μL;重复试验中批内和批间变异系数均小于4%;与牛传染性鼻气管炎病毒、牛副流感病毒3型、牛轮状病毒、牛病毒性腹泻病毒、牛支原体、肺炎克雷伯菌和曼氏杆菌等病原检测无交叉反应,能特异性检出MAP。应用建立的qPCR开展了内蒙古自治区6个市的MAP临床样品检测和流行情况分析,结果显示MAP平均阳性率为0.85%(6/704)。结果表明,成功建立了MAP的实时荧光定量PCR检测方法,可用于临床中MAP的监测和调查,为MAP疾病诊断与监控提供了快捷的方法。

摘要：设计了一种小型室外无人垃圾清扫车的控制方案。该方案选取缩进式清扫作为路径规划策略,应用曲率算法与路段单元判断算法实现清扫车自主循迹。曲率算法是根据清扫车测距传感器的返回值计算切向与法向的位移微元,进而计算路缘线曲率;路段单元判断算法是通过识别五种基本路段单元特征判断清扫车所处路段,进而实现清扫车自主决策与循迹。

摘要：提出基于知识的广义特征信息模型和记录设计历史的广义特征CSG树的表示方法.通过对设计知识与广义特征的封装,构建了广义特征信息模型,在该模型基础上用CSG树的方法表示了设计过程.广义特征信息模型和广义特征CSG树存储于XML格式的广义特征信息表中,实现了设计过程的保存.通过对广义特征信息表的导入和解析,重构了设计过程,实现了设计过程和设计知识的重用.最后给出了在涡轮叶片设计中的实例.

摘要：目的 研究孕妇牙周状况和口腔幽门螺杆菌(Helicobacter pylori,Hp)感染情况及其影响因素。方法 选择2023年1—10月于川北医学院附属医院定期产检的190名孕妇作为研究对象。采用自行设计问卷对所有孕妇行口腔卫生行为调查;采用视诊和探诊结合的方法,对孕妇行口腔检查,记录牙结石、探诊出血、牙周附着水平、探诊深度等牙周指标;采用Hp检测纸(干化学法)检测孕妇口腔Hp感染情况;记录不良妊娠结局(早产和低出生体重儿)发生情况。结果 孕妇牙周炎患病率为49.5%(94/190),口腔Hp感染率为44.7%(85/190)。1年内洁牙(OR=0.238,95%CI:0.108~0.527,P 3 min(OR=0.268,95%CI:0.104~0.691,P=0.006)、有妊娠期呕吐(OR=2.165,95%CI:1.147~4.088,P=0.017)、患牙周炎(OR=2.086,95%CI:1.101~3.954,P=0.024)是口腔Hp感染的独立影响因素。190名孕妇中10名发生早产、6名发生低出生体重儿,不良妊娠结局发生率为8.42%。患牙周炎及口腔Hp感染组、仅患牙周炎组、仅口腔Hp感染组、无牙周炎及无口腔Hp感染组不良妊娠结局发生率依次为18.00%(9/50)、6.82%(3/44)、8.57%(3/35)、1.64%(1/61),其差异有统计学意义(P=0.019)。结论 孕妇牙周状况及口腔Hp感染情况均不佳,且患有牙周炎和口腔Hp感染可能与不良妊娠结局相关,需注意规范孕妇口腔卫生行为的实施(定期洁牙、增加刷牙时间等)及定期检查牙结石、妊娠期呕吐等情况,以及时维护妊娠期牙周健康。

摘要：提出了鲁棒自适应模糊轨迹线性化控制(RAFTLC)方法并应用于空天飞行器(ASV)飞行控制系统设计.根据系统的先验知识,设计出标称模糊系统对系统的未知干扰和不确定进行估计,并通过鲁棒自适应控制项来克服标称模糊系统逼近误差和权值误差的影响.标称模糊系统逼近误差和权值误差的界在线调整.采用Lyapunov方法证明了闭环系统的所有信号一致最终有界.最后利用提出的控制方案设计了ASV飞行控制系统,并在高超声速条件下进行了仿真验证.仿真结果表明了控制方案的有效性和鲁棒性.

摘要：How to control the dipole orientation of organic emitters is a challenge in the field of organic light-emitting diodes(OLEDs).Herein,a linear thermally activated delayed fluorescence(TADF)molecule,PhNAI-PMSBA,bearing a 1,8-naphthalimide-acridine framework was designed by a doublesite long-axis extension strategy to actively control the dipole *** horizontal ratio of emitting dipole orientation of PhNAI-PMSBA reaches 95%,substantially higher than that of isotropic emitters(67%).This unique feature is associated with the intrinsically horizontal molecular orientation of PhNAI-PMSBA and the good agreement between its transition dipole moment direction and molecular long *** PhNAI-PMSBA-based OLED achieves an ultrahigh optical outcoupling efficiency of 43.2%and thus affords one of the highest red electroluminescence with an external quantum efficiency of 22.3%and the Commission International de l’Eclairage 1931 coordinates at around(0.60,0.40).

摘要：In this paper, the hybrid electric vehicle braking process is researched, by using variables consists of HEV speed, motor speed, and state of charge established, fimctions of mechanical braking force, regenerative braking force and efficiency of energy recovery are constructed, and the control goal is to maximization the energy recovery efficiency. Under the feedback control strategy, with the constrain condition of braking strength and braking stability, combining experiments in ADVISOR, in different experiments of different working conditions, we can see that in UDDS Cycle, the regenerative braking efficiency is the best. What＇s more, compared with strategies in ADVISOR, strategy proposed in this paper is obviously better.

摘要：The application of new-designed levitation controller requires extensive validation prior to enter into commercial service. However, huge mounts of approximations and assumptions lead the theoretical analysis away from the engineering practice. The experimental methods are time-consuming and financial expensive, even unrealizable due to the lack of suitable sensors. Numerical simulations can bridge the gap between the theoretical analysis and experimental techniques. A complete overall dynamic model of maglev levitation system is derived in this work, which includes the simple-supported bridges, the calculation of electromagnetic force with more details, the stress of levitation modules and the cabin. Based on the aforementioned model, it shows that the inherent nonlinearity, inner coupling, misalignments between the sensors and actuators, and self-excited vibration are the main issues that should be considered during the design process of controller. Then, the backstepping controller based on the mathematical model of the module with reasonable simplifications is proposed, and the stability proofs are listed. To show the advantage of controller, two numerical simulation experiments are carried out. Finally, the results illustrating closed-loop performance are provided.

摘要：核电厂换料周期延长后,换料大修期间执行的定期试验项目周期也将调整。本文介绍了定期试验周期延长论证的筛选原则和论证方法。以安全壳喷淋系统为例,采用可靠性分析法论证定期试验周期延长的可行性。定量化分析结果表明,定期试验周期延长导致的系统可用度降低是可以接受的。