摘要：A compact room-temperature inter-digital H-mode(IH)drift tube linac(DTL)with Kombinierte Null Grad Struktur beam dynamics is proposed in this *** proposed IH-DTL,which operates at 325 MHz,accelerates 18 mA proton particles from 3.0 to 7.0 MeV as part of a proton synchrotron-based therapy *** is composed of two main sections,namely a bunching section(-30°)and accelerating section(0°).There is no transverse focusing element inside the cavity,which increases the acceleration gradient and reduces the cavity length and power *** our physical designs,LORASR code is utilized for beam dynamics design and multi-particle *** synchronous particle energy,injection phase,and acceleration voltage of each gap are optimized carefully to increase transmission efficiency while minimizing beam emittance growth and beam *** total length of the cavity is 0.82 m and the acceleration gradient reaches 4.88 MV/m,resulting in a transmission efficiency of 100%and beam emittance growth less than10%.The details of the specific work undertaken in this study are presented in this paper.

摘要：A compact interdigital H-mode drift-tube linac (IH-DTL) with the alternating-phase-focusing (APF) method, working at 325 MHz was designed for an injector of a proton medical accelerator. When fed in with a proper RF (radio frequency) power, the DTL cavity could establish the corresponding electromagnetic field to accelerate the ‘‘proton bunches’’ from an input energy of 3 MeV to an output energy of 7 MeV successfully, without any additional radial focusing elements. The gap-voltage distribution which was obtained from the CST■ Microwave Studio software simulations of the axial electric field was compared with that from the beam dynamics, and the errors met the requirements within ± 5%. In this paper, the RF design procedure and key results of the APF IH-DTL, which include the main RF characteristics of the cavity, frequency sensitivities of the tuners, and coupling factor of the RF power input coupler are presented.

摘要：真空蝶阀广泛应用于中、低真空环境下的压力控制,由于蝶阀压力控制系统具有强非线性和时滞性,使得常规比例积分微分(PID)控制算法无法满足真空蝶阀对高精度压力控制的需求。为了提高真空蝶阀的压力控制性能,文章设计了一种带校正函数的改进模糊PID控制算法。实验结果表明,由于采用了模糊PID控制,新控制器在超调量和调节时间上远好于传统PID控制器;并且借助校正函数,新控制器可以明显改善系统的非线性影响,提高系统的响应速度以及控制精度。优化后的模糊PID控制器在动态性能、控制误差和目标跟踪速度上均优于传统方法,显著提升了真空蝶阀的压力控制性能。

摘要：对高品质再生粗骨料混凝土(RCAC)的配合比优化进行深入研究,通过调整配合比设计,提高RCAC的力学性能和耐久性,以满足现代建筑对环保材料的高性能要求。研究过程中,采用实验室试验与数据分析相结合的方法,探讨了水灰比、骨料替代率、掺和料种类和掺量等关键参数对RCAC性能的影响。通过多组配合比试验,确定了RCAC的最优配合比。结果表明:优化后的RCAC在强度、抗裂性和耐久性等方面均表现出色,具有较高的综合性能。

摘要：为解决轴杆件磁力研磨过程中由磁感应强度与磁场梯度不匹配导致表面研磨不均匀与表面粗糙度改善率低的问题,本文通过ANSYS Maxwell 16.0软件模拟优化双圆盘磁极的结构排布、数量、尺寸、转向对磁感应强度及磁场梯度等关键因素的影响,实现磁感应强度增强及磁场梯度变化的目标,采用冷压烧结成功制备80,150和250μm不同粒度等级铁基SiC磨料,使用优化设计后双圆盘磁极装置对TC4钛合金杆件表面进行研磨试验,并讨论分析了磁极不同转向及转速、磨料粒径及添加量对TC4钛合金杆件表面质量的影响。结果表明,16磁极、内径126 mm-外径156 mm、 NS-SN排布方式的双圆盘磁极同向旋转时,磁感应强度可达0.63~1.18 T,磁感积分增量为24.515 T·mm,具有最佳的磁感应强度与磁场分布;磁极同向旋转、转速为800 r·min^(-1),磁性磨料粒径为150μm,磨料添加量为96 g时,加工4道次后TC4钛合金杆件表面粗糙度由0.965μm降低至0.354μm,150μm级磨料可实现最佳研磨精度与效率,加工表面粗糙度改善率达63.32%。双圆盘磁极的高磁感应强度和磁场梯度有利于磨料流动更新,表面粗糙度改善率高,表面纹理致密、无缺陷。

摘要：新工科建设的深入推进,对高等院校工科专业人才培养和课程教学提出了新的挑战。文章围绕智能制造领域的机电一体化系统设计课程,分析了课程教学的现状和存在的问题,探讨了教学模式与方法转变的必要性,总结了多种教学模式改革策略,旨在提升课程教学质量,培养学生的创新能力和实践能力,以适应新形势下工科教育的需求。

摘要：气候变化导致了青藏高原冰冻圈的快速变化,增加了冰冻圈灾害发生的规模和频率,严重威胁着冰冻圈区域工程和运营安全,影响青藏高原冰冻圈区域的可持续发展和人民的生活福祉。文中分析了青藏高原冰冻圈区域工程所面临的挑战,阐述了近年来青藏高原冰冻圈变化及其未来变化趋势。从冰冻圈灾害类型和观测到的冰冻圈灾害对工程影响的视角,探讨了冰冻圈变化和灾害对工程设计和安全运营以及工程建设和维护经济成本的影响。提出了减缓气候变化下冰冻圈变化和灾害的应对策略,并讨论了工程的应对策略和技术措施。

摘要：为解决目前立体匹配模型中随机不确定性的量化未充分利用训练数据而导致视差估计性能提升受限的问题,在ACV-Net模型基础上提出一种随机不确定性融合标签分布学习的立体匹配模型,记为ACV-Net-AL。利用ACV-Net模型提取特征,形成随机不确定性空间和视差空间;对随机不确定性空间采用高斯分布的概率密度函数进行量化随机不确定性;融合随机不确定性和标签视差值形成正态的动态视差分布,监督视差值的预测。在KITTI数据集上的实验结果表明,相较于ACV-Net,所提模型的视差值异常点的比例下降了1.99%,在表征预测置信度的同时显著提高视差估计性能。

摘要：淄博市在实施医疗保险政策过程中,合理设计起付线、共付比例、封顶线"三条线"标准,推行付费方式改革,建立合理的医疗费用负担机制,对控制医疗费用不合理增长、提高医疗保障绩效、促进制度可持续发展具有重要作用。

摘要：Data collection with microcrystals at synchrotron radiation facilities is challenging because it is difficult to harvest and locate microcrystals. Moreover,microcrystals are sensitive to radiation damage; thus, typically, a complete data set cannot be obtained with a single microcrystal. Herein, we report a new method for data collection with multiple microcrystals having a crystal size ranging from 1 to 30 lm. This method is suitable for not only low-temperature(100 K) data collection but also room-temperature data collection. Thin Kapton membranes were used to capture multiple crystals simultaneously. The microcrystals were visible under an optical microscope and easily located because the membrane was transparent and sufficiently thin. The film was fixed to a bracket that was prepared using a three-dimensional printer. The bracket was fixed on a magnetic base via screwing and employed by the goniometer system for data collection. Multiple data sets of fatty acid-binding protein 4(FABP4) and lysozyme microcrystals were collected using this novel designed device. Finally, the structures of protein FABP4 and lysozyme were obtained from these data via the molecule replacement method. The data statistics reveal that this method provides a comparable result to traditional methods such as a nylon loop.