摘要：盖挖逆作地铁车站施工光线暗,使得裂缝形态与混凝土背景融合度高,裂缝分割难度增大。传统区域生长法需要手动指定区域生长的起点,导致图像分割稳定性差,复现性差。根据盖挖逆作地下裂缝采集的信息,总结裂缝基本形态特征,发现裂缝区域具有灰度值小、裂缝细长的特性,据此对区域生长法进行改进。采用长宽比为2∶1的像素矩阵遍历搜索图像,计算各矩阵区域内灰度均值最小值的中心点作为区域生长的起点,可以实现区域生长法种子点的自动选取。根据裂缝不连通或单幅图像存在多条裂缝的特点,采用循环算法可以实现多种子点的选取,更加精准地识别裂缝形态。通过对区域生长法的改进,提高了盖挖逆作地铁车站裂缝识别的精确性,同时保证了分割效果具有更好的稳定性和复现性。

摘要：Thermodynamic and kinetic study on TRIP （transformation induced plasticity） steels, cemented carbides and mold steel for plastics were carried out in order to design modern advanced materials. With the sublattice model, equilibrium compositions of ferrite and austenite phases in TRIP steels, as well as volume fraction of austenite at inter-critical temperatures for different time were calculated. Concentration profiles of carbon, manganese, aluminum and silicon in the steels were also estimated in the lattice fixed frame of reference. The effect of Si and Mn on TRIP was discussed according to thermodynamic and kinetic analyses. In order to understand and produce the graded nanophase structure of cemented carbides, miscellaneous phases in the M-Co-C （M= Ti, Ta, Nh） systems and Co-V-C system were modeled. Solution parameters and thermodynamic： properties were listed in detail. The improvement of machining behavior of prehardened mould steel for plastics was obtained by computer-aided composition design. The results showed that the matrix composition of large-section prehardened mould steel for plastic markedly influences the precipitation of non-metallic inclusion and the composition control by the aid of Thermo-Calc software package minimizes the amount of detrimental oxide inclusion. In addition, the modification of calcium was optimized in composition design.

摘要：设计一种用于立式钻床,方便对孔系(三及三倍等分孔系)定位及钻削加工,且能根据孔系分布的圆周尺寸调整钻削位置的三轴钻工艺装备。在确定该工艺装备适用的机床参数的基础上,通过对比分析确定了其总体方案,对传动系统进行设计并校核了主要零件,同时利用SolidWorks软件辅助设计了工艺装备的箱体结构、连接结构及圆周钻孔零件,建立模型并进行模拟装配,验证了设计结构的合理性。设计结果表明,这种三轴钻工艺装备可在原立式钻床的基础上快速安装、调整和加工圆周孔系,可节约时间成本、降低工人劳动强度,提升钻削加工效率。

摘要：A new type of transformation induced plasticity （TRIP） steel with not only high strength and high ductility but also superior welding and galvanizing properties was designed and developed recently. Low carbon and low silicon content were preliminarily selected with the aim of meeting the requirements of superior quality in both welding and galvanizing. Phosphorus was chosen as one of the alloying elements, because it could reduce carbon activity in cementite and increase the stability of austenite. In addition, the possibility of phosphorus segregating at grain boundary was also discussed by thermodynamics as well as kinetics. Phase diagram was estimated at high temperature and the composition of the steel was then selected in the hyperperitectic range to avoid problems, which might occur in sheet steel continuous casting. Phase diagram in the *** temperature was estimated for the steel to obtain the starting temperature of fast cooling. For understanding the minimum rate of fast cooling, pearlite growth kinetics was calculated with self-developed diffusion coefficients of elements in grain boundary. Overaging temperature was determined through the calculation of To temperature by both equilibrium and para-equilibrium assumptions, which was different from the current determination, which is only based on an equilibrium estimation.

摘要：随着工业的发展,染料废水对人类和环境的危害愈加显著,其中偶氮类的亚甲基蓝这种染料废水不仅色度大,而且难以降解.因此设计一种高效且灵敏的吸附剂来去除亚甲基蓝对人类和环境的危害是亟须解决的问题.本研究利用基于色散力校正的密度泛函理论(DFT-D)的第一性原理方法探索了本征及掺杂磷烯吸附剂对亚甲基蓝的吸附机理,并详细考察了本征及掺杂Al,Ca,Ti和Fe金属原子后的磷烯对亚甲基蓝吸附的影响.研究结果表明亚甲基蓝初始构型会影响磷烯对其吸附,当亚甲基蓝平躺于磷烯表面时有较大的吸附,且金属原子掺杂显著地影响其对亚甲基蓝的吸附能力,掺杂金属原子均增大了磷烯对亚甲基蓝的吸附.其中吸附能力是Fe掺杂磷烯>Ca掺杂磷烯>Ti掺杂磷烯>Al掺杂磷烯.研究结论对于亚甲基蓝的处理带来了新的指导方向,有望为相关染料废水的检测和去除提供有意义的理论参考.

摘要：The Accelerator Driven Sub-critical(ADS)system is a strategic plan to solve the nuclear waste problem for nuclear power plants in ***-energy particle accelerators and colliders contain long strings of superconducting devices,superconducting radio frequency cavities,and magnets,which may require cooling by 2 K superfluid helium(HeliumⅡ).2 K superfluid helium cryogenic system has become a research hot spot in the field of superconducting *** this study,the ADS Injector-I 2 K cryogenic system is examined in *** cryogenic system scheme design,key equipment,and technology design,such as the 2 K Joule–Thomson(J–T)heat exchanger and cryomodules CM1+CM2 design,are examined,in addition to the commissioning and operation of the cryogenic *** ADS Injector-I 2 K cryogenic system is the first 100 W superfluid helium system designed and built independently in *** ADS proton beam reached 10 Me V at 10 m A in July 2016 and 10 Me V at 2 m A in continuous mode in January 2017 and has been operated reliably for over 15,000 h,proving that the design of ADS Injector-I 2 K cryogenic system,the key equipment,and technology research are reasonable,reliable,and meet the *** research into key technologies provides valuable engineering experience that can be helpful for future projects such as CI-ADS(China Initiative Accelerator-Driven System),SHINE(Shanghai High Repetition Rate XFEL and Extreme light Facility),PAPS(Platform of Advanced Photon Source Technology),and CEPC(Circular Electron-Positron Collider),thereby developing national expertise in the field of superfluid helium cryogenic systems.

摘要：我们与将军一起考虑一套多代理人系统(质量) 线性时间不变(LTI ) 动力学和性能索引联合系统的行为的一个控制问题。在代理人之间的互联拓扑学与自我环作为一台未受指导的小型旋转式印刷机被建模，在每个系统是一个节点，在每个节点的控制行动是它的状态的功能和它的邻居的状态的地方。在这份报纸考虑的线性二次的管理者(LQR ) 控制问题能在反馈获得上由于块对角线限制被认为是一个结构优化问题。它被看那在最小化一个单个代理人系统的和性能的分布式的控制器平等者下面最小化多代理人系统的 LQR 性能限制。一个足够的条件以一套线性矩阵不平等(LMI ) 被介绍完成某些非最优的表演说明。除了使控制设计更适用， LQR 表演区域的观点被介绍并且分析，它被显示关于拉普拉斯算符矩阵的特征值凸。多代理人系统的 LQR 控制然后被变换成一套分系统的 LQR 控制，它作为系数与最小、最大的特征值合并二仅仅不平等限制。数字例子被举说明建议方法。

摘要：Deamination is a crucial step in the transformation of 6-cyclopropylamino guanosine prodrug to its active form. A convenient method using capillary electrophoresis （CE） without sample labeling was developed to analyze the deamination of a series of D-/L-6-cyclopropylamino guanosine analogs by mouse liver homogenate, mouse liver microsome, and adenosine deaminase （ADA）. A two-step process involving a 6-amino guanosine intermediate formed by oxidative N-dealkylation was demonstrated in the metabolism of 6-cyclopropylamino guanosine to 6-hydroxy guanosine. The results indicated that the transformation rates of different prodrugs to the active form varied greatly, which were closely correlated with the configuration of nucleosides and the structure of glycosyl groups. Most importantly, D-form analogs were metabolized much faster than their L-counterparts, thus clearly pointed out that compared to guanine, modification of glycosyl part might be a better choice for the development of L-Kuanosine analogs for the treatment of HIV,

摘要：中原油田已进入开发后期,综合含水不断上升,抽油杆与油管之间因偏磨加剧、管杆问题造成躺井作业所占比例逐年上升。中原油田1982年全面投入开发,1984年进入注水开发阶段,2016年底综合含水已高达90%以上,偏磨加剧,管杆失效逐年增加,给油田生产管理以及成本控制都带来了很大困难。

摘要：目的为突破文创产品概念设计前端的"黑箱"思维定势,提出一种以感性叙事为导向的文创产品概念设计方法。方法首先,对叙事文化与叙事意象进行分析,构建叙事要素发散树;其次,运用前向式感性工学、因子分析等方法,建立叙事要素关联性评判指标;最后,采用模糊评价法优选叙事要素,为文创产品设计提供有效的知识辅助。结果以苗族银器旅游文创产品设计为例,验证了本设计方法的可行性。结论该方法实现将文创产品设计的"黑箱"转为"白箱"思考模式,实现设计知识的共享,借鉴和参考。