摘要：目的 探索一种基于6种手部精细运动解码的脑机接口(BCI)技术。方法 在分析了6种手部常见精细运动脑电图(EEG)产生机理与响应特性的基础上,设计了手部精细运动执行BCI范式,实现了一种基于卷积神经网络的运动相关EEG信号解码模型,并搭建了基于手部精细运动的BCI系统,对8例健康受试者、2例因病变累及顶叶而出现明显运动功能障碍患者的6种精细运动手势EEG信号进行了分类。结果 10例受试者在基于手部精细运动的BCI系统下,EEG信号的分类准确率为(79.20±6.05)%。结论 基于6种手部精细运动解码的BCI方法具有一定有效性和泛化能力。

摘要：The coronary artery calcification score and pericardial fat volume have recently been reported to be strongly associated with the severity and presence of coronary atherosclerosis. However, no studies have explored the outcome of phased progression of atherosclerosis by non-contrast computed tomography in asymptomatic people in China. The population-based cohort study in outcome of phased progression of atherosclerosis in China （PERSUADE）, an observational, longitudinal and prospective cohort study in a target population of healthy sub- jects based in Jidong Oilfield （China）, prospectively analyzes the outcome of phased progression of atherosclerosis by non-contrast computed tomography in healthy population. The results of this study are expected to be of value for utilizing noninvasive imaging combine with tradi- tional cardiovascular risk factors to create a risk stratification and find pertinent biomarkers associated with the outcome of phased progres- sion of atherosclerosis in healthy people, thereby could help to establish a more personalized treatment of clinical practice.

摘要：某发动机的曲轴后油封在整车工厂零公里处,在发动机怠速时有异响发生。本文通过对故障发动机的零部件进行拆解分析,并经过故障再现,确定异响机理为:油封本体耐负压指标不足,外加回油不畅,在油封自带的“泵吸效应”下,空气由发动机外部进入发动机内腔,在油封唇口处发生油封唇口与曲轴的干摩擦声,并伴随有空气流过的口哨声,导致异响发生。为了解决该异响问题,对曲轴后油封本体结构及回油结构进行调整优化。经过试验验证,整改方案确认有效。本次分析为问题的关闭,以及后续新项目的油封设计选型及布置提供了宝贵经验。

摘要：该艺术与设计实验教学中心依托综合学科背景，遵循先进的教学理念，通过建立科学、合理、完善的运行管理机制，充分利用综合一体、专业多样、各具特色的实验资源和雄厚的师资队伍，不断创新实验实践教学体系和教学模式。通过不断努力，中心已成为综合、开放、多元、交叉的艺术和设计实验实践教学开放式平台。

摘要：卸荷阀是液压支架系统关键的压力控制元件。提出了一种高压超大流量纯水卸荷阀结构,并对卸荷阀的工作原理进行分析,建立了卸荷阀的数学模型。通过搭建AMESim仿真模型,分析了卸荷阀的动态循环工作过程,以及先导阀、主阀、单向阀的启闭动态压力特性。在调定卸荷压力下,对影响卸荷阀恢复压力的关键因素进行了分析。为了验证仿真模型的准确性,搭建了卸荷阀的试验测试系统。研究表明,仿真与试验的压力参数吻合较好,通过调整顶杆直径、阻尼孔直径、阻尼孔长度及先导阀弹簧刚度,可以优化卸荷阀的恢复压力,研究结果可以为高压超大流量纯水卸荷阀的设计提供理论基础。

摘要：The electrochemical dissolution and passivation of laser additive manufactured Ti6Al4V were investigated through Tafel polarization,potentiostatic polarization and AC impedance *** results show that the solution treatment−aging(STA)process aggravates the element micro-segregation compared to the annealing process,leading to varied Al and V contents of the phases from different *** is proven that either Al-rich or V-rich condition can highly affect the electrochemical dissolution behaviors due to thermodynamical instability caused by element *** dissolution rate in the metastable passivation process is controlled by the stability of the produced film that is affected by phases distribution,especially the difficult-to-dissolve *** then,the dissolution rate of the phases in the transpassivation region is consistent with the rank in the activation process because the dense film is not capable of being *** to the annealed sample,the higher dissolution rate of the STA sample is beneficial to the electrochemical machining(ECM)of Ti6Al4V.

摘要：[目的]比较同发双侧乳腺癌保乳术后患者采用螺旋断层调强放疗(helical tomotherapy,TOMO)技术相较于容积弧形调强放射治疗(volumetric modulated arc therapy,VMAT)技术的剂量学差异。[方法]选取既往采用VMAT治疗的同发双侧乳腺癌保乳术后患者10例,重新进行TOMO计划设计,分别评价靶区的D_(2%)、D_(98%)、平均剂量D_(mean)以及均匀性指数(homogeneity index,HI)、适形度指数(comformal index,CI)和梯度指数(gradient index,GI),危及器官包括心脏、左冠状动脉前降支、双肺、左肺、右肺、食管、肝脏等,并统计机器跳数、出束时间。[结果]TOMO计划的靶区D_(mean)相对较低且高剂量D_(2%)低于VMAT计划(P=0.004、0.002),低剂量D_(98%)两组相当(P=0.444)。在靶区的CI和GI方面,TOMO计划更具优势(P均<0.001),两组HI差异无统计学意义(P=0.120)。TOMO计划的心脏V_(5 Gy)、D_(mean)和左冠状动脉前降支的D_(max)高于VMAT计划,差异均有统计学意义(P<0.001,P=0.007,P=0.031);TOMO计划双肺V_(20 Gy)高于VMAT计划(P=0.048);TOMO计划的肝脏D_(mean)高于VMAT计划(P<0.001)。与VMAT相比,TOMO计划机器跳数增加明显且计划执行时间增加约4.5倍。[结论]在同发双侧乳腺癌中,TOMO与VMAT相比在靶区包绕适形性和剂量跌落上优于常规VMAT技术,除食管外未发现危及器官剂量学优势,计划执行效率上有待提高。

摘要：通过设计太阳能专用球阀新型结构,改进表面强化工艺,增加超洁净控制的软硬件投入,对洁净球阀进行了强度试验工况、密封试验工况以及温度场仿真分析。并对洁净球阀的加工过程提出质量控制要求。

摘要：为寻找开发火麻仁蛋白,提高火麻应用价值的最佳条件,以火麻蛋白为原料,通过酶解法制备火麻仁黄嘌呤氧化酶抑制肽,采用正交试验法优化中性蛋白酶酶解火麻蛋白制备多肽的最佳工艺条件。以中性蛋白酶用量、酶解时间、酶解温度进行单因素试验,通过正交试验分析获得制备火麻仁黄嘌呤氧化酶抑制肽的最佳酶解条件为pH值6.5,料液比1∶5,酶用量6000 U/g,酶解温度50℃,酶解时间5 h。在此条件下进行的验证试验中,多肽抑制率为78.98%,表明该工艺稳定、可行,具有较高的应用价值。

摘要：We propose the construction of a compact linac as the injector of a cancer therapy facility at the Institute of Modern Physics(IMP) of the Chinese Academy of Sciences(CAS). Based on a traditional setup, a new compact fast-bunching design is first introduced to optimize the 600 keV/u RFQ with a 0.05 pm A ^(12)C^(4+) beam. This shortens the RFQ structure length from the standard design value of272–230 cm while effectively regulating the particle loss and emittance growth. In addition, a detailed error analysis was performed after the optimization process. The error sources cover input beam parameters errors, machining errors and alignment errors. The simulation results show that the beam loss and emittance growth of the RFQ are acceptable and within typical ranges of error.