摘要：In FLAC ^(3D),cable element or modified pile element can be used to build slope anchoring ***,the difference between the two structural elements and their influence on the calculation results have not been studied in *** order to solve this problem,the Xiashu loess slope anchoring models based on cable element and modified pile element were constructed respectively.A variety of anchoring schemes were designed by orthogonal experiment method,and then they were brought into the model for calculation and the calculation results were analyzed by range analysis and variance *** results show that the modified pile element can bear the bending moment and reflect the strain softening property of the *** the perspective of slope safety factor,the anchorage length and anchor bolt spacing are the main factors affecting the stability of the slope,and the anchorage angle is the secondary *** grout in cable element is assumed to be an elastic-perfectly plastic material,so the safety factor of the slope can be significantly increased by increasing the length of the anchor *** will bring potential risks to the slope treatment ***,in the calculation of the slope anchoring model,the modified pile element is more suitable for simulating the anchor bolt.

摘要：提出了一种基于现有电磁兼容扫描平台的设备改造方案以解决在实际使用中出现的问题。增加了一组水平测试探头,使得探头可以在垂直或水平平面上测试,同时扩大了被测件内部可测纵深,满足更大体积的被测物件的检测。并搭建了对比平台,验证了增设的水平测试探头的测量精确度。同时,在X轴两端增加两个新型冲孔固定支架,可固定各种大小不同的被测物件,通用性固定架为测试时被测件的固定方式提供了多样化的选择。经仿真,选取对空间磁场影响最小的材质来制作固定架。特殊设计的连接件可以有效利用原扫描平台滑轨进行固定架的移动及固定。改造后的平台扩大了被测件的测试范围及其使用灵活性,同时提高了大型设备的利用率。

摘要：为了使高速通信系统更加紧凑、成本更低、减小功耗,特别是提高设备的可靠性,可采用QPSK数字调制技术来实现,其具有频谱利用率高、频谱特性好、抗干扰性能强、传输速率快等特点。运用VHDL语言在QuartusⅡ开发平台上进行基于CPLD的QPSK原理设计及信号的波形模拟仿真,结果表明:系统可完全实现解调功能,并具有集成度高和可软件升级等优点。

摘要：针对风电叶片疲劳试验过程中实际振幅与目标振幅的追踪控制关键问题,提出了一种基于RLS算法的实际振幅与目标振幅的追踪控制策略,设计出了一套风电叶片疲劳试验系统。采用基于RLS算法的自适应滤波和幅值响应策略,通过调整RLS算法中的加权数值,解决了实际试验过程中的干扰噪声和幅值振荡问题,实现了叶片振幅的有效追踪;通过构建基于Matlab/Simulink的测试系统模型,并结合现场试验,验证了算法的自适应滤波和幅值响应效果。研究结果表明:采用基于RLS算法的振幅追踪控制策略,能够有效地保证实际振幅与目标振幅的跟随性,振幅跟随误差不超过有效振幅的±5%,这对于风电叶片疲劳的理论研究与实际应用具有一定的指导意义。

摘要：液晶回音壁模式(WGM)传感技术结合了液晶材料的高敏感性和光学WGM的高精度特性,在物质检测、环境监测和生物医疗等领域具有广阔的应用前景。为提升传感测量的精度和灵敏度,除了改善传感器的结构特性以外,如提高品质因子、实现窄线宽、提升波长移动范围等,准确标定WGM光谱谱线是一个重要内容。然而,实际应用中,WGM光谱的非规则分布给谱线标定带来了挑战。本文针对此问题提出了一种基于Savitzky-Golay(SG)滤波和高斯平滑的WGM非规则光谱标定方法,并提出了光谱标定的对称性、高线性和合理性三原则。将WGM光谱标定分为规则和非规则两类。对于规则光谱,具有良好的洛伦兹线型和高斯包络轮廓,可以选择最高强度谱线或中心波长,或者具有相同自由光谱范围(FSR)的相邻模式谱线作为谐振波长。而对于非规则光谱,可以分为三类:(1)光谱缺峰和强度突变,主要由于谐振条件的损耗变化所致;(2)光谱非规则劈裂,液晶微腔中可能存在微小的缺陷或杂质,导致光谱的非对称劈裂;(3)混合型变化光谱,受到复杂测量环境的影响,可能出现多种不规则变化。通过SG滤波和高斯平滑处理,有效地恢复光谱的对称性,提升拟合线性度,实现光谱标定。为验证该方法的有效性,根据不同类型光谱标定情况,分别设计了利用液晶WGM对不同生物分子的传感实验,包括胰蛋白酶(浓度0.75~2.00μg·mL^(-1))、pH(4.55~6.86)、DNA(浓度90~490μg·mL^(-1))等。实验结果表明,采用本文方法和三原则进行液晶WGM光谱标定和谐振峰选取,传感灵敏度的线性度均在0.99以上,具有较好的可靠性和稳定性。该研究创新之处在于提出了针对液晶WGM光谱非规则分布的有效标定方法和三原则,为提高液晶WGM传感测量的准确性和有效性提供了有效解决方案和重要的理论和方法支持,具有重要的应用和理论意义。

摘要：环境控制模拟系统,是开展农田生态系统对全球气候变化响应研究的有效手段,但目前应用于试验中的模拟系统均存在一定局限,如CO_2气体过量消耗、试验成本较高、模拟的试验环境与真实的自然环境差异较大、试验空间有限、不易重复等。针对这些问题,本研究对半开放式CO_2浓度和温度递增模拟系统(CTGC)进行了硬件升级和设计改进,针对其CO_2浓度的控制效果包括CO_2浓度监测、CO_2气体释放两大系统进行改进,使其能达到精准控制CO_2气体释放,降低试验成本,精确模拟未来高CO_2浓度的生产环境,其空间面积较大,适合多种作物同时试验。改进后的系统利用电磁阀组和CO_2浓度检测传感器组成的多通道监测系统,实时检测各处理区域内的CO_2浓度,实现精准监测。在CO_2气体释放源端,采用比例调节式减压器,有效减少了CO_2从储气罐中被减压后在气体管路中的压力积蓄,控制CO_2气体精量释放;系统将CO_2释放方式由纵向改为横向,释放管道由主管加支管组成,由控制流量调节阀将主管与支管相连接,使气室内形成均匀的CO_2释放区域,从而达到CO_2浓度梯度升高的模拟效果。试运行结果表明,改进后的CTGC系统可以实现CO_2浓度387±4.5、441±13.4、490±20.9、534±24.3和567±28.9μmol·mol-1的梯度递增,系统对环境变化的响应速度加快,能够精确实时监测气室内各处理区域CO_2浓度的变化,并实现CO_2气体的精量释放;系统内的CO_2浓度梯度递增趋于稳定,从而更好地模拟大气CO_2浓度逐渐升高的过程,满足作物对气候变化响应研究的需要。

摘要：基于夹带式皮带机物料提升段夹持力的一般数学模型,推导出为防止夹带横向移动导致物料外泄的改进模型;基于赫兹接触定理推导出弹性散粒体物料在垂直提升段物料层数(物料厚度)、物料最外层与中心(质心)所受挤压力关系的数学模型,并尝试将该模型应用于小麦散粮运输机中,通过算例验证了该模型的实用性和有效性。本模型可对现有的夹带机设计经验公式进行改良,提高计算的精度,为具体压带机分部件的设计、研究以及优化等提供一定的理论支撑,为其它相似的夹带式运输机提供研究思路和理论借鉴。

摘要：Objective To develop RT-nPCR assays for amplifying partial and complete VP1 genes of human enteroviruses(HEVs)from clinical samples and to contribute to etiological surveillance of HEV-related *** A panel of RT-nPCR assays,consisting of published combined primer pairs for VP1 genes of HEV A–C and in-house designed primers for HEV-D,was established in this *** sensitivity of each RT-nPCR assay was evaluated with serially diluted virus stocks of five serotypes expressed as CCID50 perμL and copies perμL,and the newly established methods were tested in clinical specimens collected in recent *** The sensitivity of RT-nPCR assays for amplifying partial VP1 gene of HEVs was 0.1 CCID50 perμL and 10 virus copies perμL,and for the complete VP1 gene was 1 CCID50 perμL and 100 virus copies perμL,using serially-diluted virus stocks of five *** a proof-of-concept,25 serotypes were identified and complete VP1 sequences of 23 serotypes were obtained by this system among 858 clinical specimens positive for HEVs during the past eight surveillance *** This RT-nPCR system is capable of amplifying the partial and complete VP1 gene of HEV A–D,providing rapid,sensitive,and reliable options for molecular typing and molecular epidemiology of HEVs in clinical specimens.

摘要：Mathematical models are disappointing due to uneven distribution of the air gap magnetic field and significant un- modeled dynamics in magnetic bearing systems. The effectiveness of control deteriorates based on an inaccurate mathematical model, creating slow response speed and high jitter. To solve these problems, a model-free adaptive control （MFAC） scheme is proposed for a three-degree-of-freedom hybrid magnetic bearing （3-DoF HMB） control system. The scheme for 3-DoF HMB depends only on the control current and the objective balanced position, and it does not involve any model information. The design process of a parameter estimation algorithm is model-free, based directly on pseudo-partial-derivative （PPD） derived online from the input and output data information. The rotor start-of-suspension position of the HMB is regulated by auxiliary bearings with different inner diameters, and two kinds of operation situations （linear and nonlinear areas） are present to analyze the validity of MFAC in detail. Both simulations and experiments demonstrate that the proposed MFAC scheme handles the 3-DoF HMB control system with start-of-suspension response speed, smaller steady state error, and higher stability.

摘要：Color-tunable smart-responsive organic emitters (CSOEs) represent a cutting-edge category of intelligent optoelectronic materialswidely recognized for their remarkable ability to adjust emissioncolors in response to a range of external stimuli, including excitation light, temperature, external force, and specific matter. The versatile nature of CSOEs has recently attracted significant attentionfor their unique properties, including the ability to reversibly tunecolors in response to different stimuli. Their superior responsiveness and dynamic color-changing capabilities extend beyond theperformance of traditional luminescent materials, making themhighly suitable for potential applications in multicolor displays,information encryption, and visual sensing. CSOEs have been successfully developed in various forms, including small molecules,polymers, and host–guest materials. Despite significant progressin this area, there is still a need for a comprehensive understandingof the material design and development pathways for CSOEs. Thisperspective highlights the importance of in-depth analyses ofdesign strategies and fundamental mechanisms (Fig. 1) to offerinsights that can facilitate the creation of CSOEs and effectivelyextend their applications.