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：基于活塞销与活塞销座表面型线几何型线及刚度的差异,在热载荷与机械载荷的作用下发生不协调形变,产生较大的局部接触应力,采用有限元法对某型船用柴油机活塞销孔结合面型线进行优化设计。通过对原活塞模型进行分析并与静载试验结果对比,找出应力集中位置;采用有限元软件和自行开发程序,实现活塞销-孔接触副型面的自动优化设计;最终从优化结果中选取最佳优化方案。优化后,活塞销孔型面应力集中显著降低,接触型面上最大Mises应力下降55.5%。

摘要：目的研究TC4钛合金基体表面织构设计对类金刚石薄膜(DLC)的摩擦学性能影响。方法利用激光加工和物理气相沉积组合技术,在TC4钛合金表面制备凹坑织构阵列与DLC薄膜的复合结构,研究其在甘油溶液下的协同摩擦学性能。通过微观划痕和纳米压痕试验对织构化DLC薄膜进行力学性能表征,利用ABAQUS对有无织构下DLC薄膜的失效过程进行仿真对比分析。结果表面织构可以有效地增加TC4表面DLC薄膜“低摩擦”效应的作用时间,延长其使用寿命。不同织构参数设计对DLC薄膜耐磨时间有显著影响,其中直径200μm、面积率20%的织构化DLC薄膜的性能最佳,对比光滑DLC薄膜,其耐磨寿命提升了7.52倍。力学表征及仿真分析表明,表面织构增强了DLC薄膜与TC4基体之间的“机械锁合”程度,并存在“应力扩散”现象,能够有效提升DLC薄膜与TC4基体间的力学性能。对比光滑DLC薄膜,织构化DLC薄膜试样涂层与基体之间的结合力最大可提升1.9倍。结论表面织构化设计可以有效地提升DLC薄膜与基体的力学性能,在摩擦过程中调节接触界面的应力分布,增强DLC薄膜耐磨性能,延长DLC薄膜使用寿命。研究结果将为新型人工关节表面设计提供理论支撑。

摘要：目的 :研究当归、川芎中阿魏酸提取的最佳工艺条件。方法 :以提取液中阿魏酸含量为指标 ,比较了阿魏酸提取的水煎和醇提工艺 ,并用正交设计将醇提工艺条件进行优化。结果与结论 :醇提工艺更有利于阿魏酸的提取 ,8倍量 70 %乙醇提取两次 ,1.5 h/次为醇提最佳工艺条件。

摘要：This article investigates the performances of different extractive distillation processes intensified with dividing-wall column for separating benzene-isopropanol-water ternary *** the processes with ethylene glycol as solvent are optimized with the minimal total annual cost(TAC)as *** order to get the global optimal solution intelligently,an improved simulated annealing algorithm is adopted,which is programmed in MATLAB and linked to Aspen *** results show that the extractive dividing wall column-solvent(EDWC-S)process consisting of an extractive dividing wall column and a solvent recovery column is the best *** can reduce the TAC by 28.65%and CO_(2) emissions by 32.84% compared to the conventional triple-column extractive distillation process.

摘要：TiO_(2)-based materials have been considered as one of most promising alternatives for high-performance li(Na)-ion batteries because of the low cost,simple composition,easy synthesis,good environmental protection,excellent safety and relatively high specific ***,the inferior electronic conductivity and poor ion diffusion coefficients are the biggest bottlenecks that restrict the popular *** effort has been focused on resolving these problems toward large-scale applications,and numerous significant advances have been *** the present work,a comprehensive overview of structure characteristics,electrochemical reaction mechanism and modification strategies of TiO_(2)-based materials was *** recent advances of various efficient ways for improving conductivity,li(Na)storage capacity,rate capability and cycle stability are systematically summarized,including surface engineering,constructing composite and element doping,*** TiO_(2)-based materials with novel porous heterogeneous core-shell structures have been regarded as one of the most effective ways to resolve these ***,the future research directions and development prospects of TiO_(2)-based anode materials used in the manufacture of high-performance li(Na)-ion batteries are *** review can provide important comprehension for the construction and optimization of highperformance of TiO_(2)-based anode materials.

摘要：A power amplifier’s linearity determines the emission signal’s quality and the efficiency of the *** distortion can result in system bit error,out-of-band radiation,and interference with other channels,which severely influence communication system’s quality and *** from the third-order intermodulation point of the milimeter wave(mm-Wave)power amplifiers,the circuit’s nonlinearity is compensated *** analysis,design,and implementation of linear class AB mm-Wave power amplifiers based on GlobalFoundries 45 nm CMOS silicon-on-insulator(SOI)technology are *** single-ended and differential stacked power amplifiers have been implemented based on cascode cells and triple cascode cells operating in U-band *** to nonlinear analysis and on-wafer measurements,designs based on triple cascode cells outperform those based on cascode *** single-ended measurements,the differential power amplifier achieves a measured peak power-added efficiency(PAE)of 47.2%and a saturated output power(P_(sat))of 25.2 dBm at 44 *** amplifier achieves a P_(sat)higher than 23 dBm and a maximum PAE higher than 25%in the measured bandwidth from 44 GHz to 50 GHz.

摘要：中国特色高层次学徒制作为现场工程师培养的主要形式,影响并决定着现场工程师的培养成效。然而,当前学界对于现场工程师的研究多集中于对其内涵的诠解,相对忽视了高层次学徒制这一主要培养形式。究其原因,主要源于中国特色高层次学徒制研究尚处于起步阶段,很多疑惑尚需进行深入讨论。随着教育本位转移、社会转型、技术迭代,学徒制的教育组织形态、教育内容、教育方式不断发生变革,为构建中国特色学徒制提供了理论依据。同时,国内外高层次学徒制探索也不断推动学徒制教育由现代学徒制向高层次学徒制迈进,为构建中国特色学徒制提供了实践基础。构建中国特色高层次学徒制,亟须从教育制度、培养模式、教学方式等维度对其本质内涵进行阐释,加强顶层制度内涵设计,营造良好的外部运行环境,进一步提高现场工程师培养质量。

摘要：该试验根据GenBank数据库沙门氏菌的特有基因invA(AE008832)设计扩增长度为285bp的引物,研究PCR技术在检测冷冻肉中沙门氏菌的检测限度。在生理盐水中食源性沙门氏菌的检测限度为103cfu/mL;在人为污染肉汤中,普通PCR的检出限为1.98×103cfu/mL;人为污染后的样品肉汤中沙门氏菌浓度为100,101,102cfu/mL时,分别培养7,6,6h即可检测到。

摘要：A series of novel polyethylene glycol-dicationic imidazolium-based ionic liquids(mPEG-ILs)were synthesized by facile quaternization reaction from various elaborately designed di-imidazoles and PEG,which were then studied as green plasticizers for sustainable polylactide(PLA)material.