摘要：为研究加劲环内、外布置两种方式对钢衬与加劲环自身受力的影响,以某地下储气库工程为例,利用ABAQUS软件分析了气压和温度两种荷载作用下钢衬与加劲环的力学响应。结果表明,地下储气洞室端部封头导致钢衬与混凝土之间产生轴向相对滑移,嵌入回填混凝土内的外设加劲环发生明显的弯曲变形,产生应力集中现象,可能引起加劲环与钢衬连接角焊缝破坏。与之相反,在储气库内压和温度作用下,内设加劲环应力分布更加均匀,钢衬整体变形更加协调,而且可以减小开挖半径和回填混凝土工程量,大大节省工程投资,在地下储气洞室密封钢衬设计时具有一定优势。

摘要：低渗油藏注水开发效果一般较差,采用CO_(2)驱油能有效提高原油采出程度。为分析影响CO_(2)辅助重力驱油效果的各种因素,从注气辅助重力驱油研究机理出发,建立一注一采的机理模型,分析地质因素与开发因素的影响规律,并采用正交试验设计方法和Shapley值方法进行多因素分析。研究结果表明:正韵律储层更适合CO_(2)辅助重力驱油;储层倾角、平均渗透率、注气速度与开发效果呈正相关;垂向渗透率与水平渗透率比值、渗透率级差与开发效果呈负相关;中上部位置注气及无因次水平井段长度比值设置为0.8可以有效提高CO_(2)辅助重力驱油效果;垂向渗透率与水平渗透率比值对CO_(2)辅助重力驱油影响程度最高。该项研究成果为提高低渗油藏CO_(2)辅助重力驱油的开发效果提供了技术指导和理论支持。

摘要：在出流工况下,侧式进/出水口扩散段内水流与边壁易发生分离,产生局部非稳态现象,从而导致进/出水口流态紊乱。采用RNG k-?紊流模型对某抽水蓄能电站进/出水口流场进行三维数值模拟,并通过模型试验验证了数值模拟的合理性。研究结果表明:侧式进/出水口在扩散流时,受扩散角的影响在主流附近存在流动分离区,该区域紊动强度较大,形成局部非稳态现象,紊动强度与流速平方呈线性关系。流道内流速呈现周期性波动,波动周期与雷诺数近似呈幂函数关系。中间流道的波动周期小于边流道,且边中流道流速波动周期的差异与雷诺数呈现正相关。试验中对流速的监测时长应涵盖数个波动周期,才能准确衡量进/出水口的水力学特性。

摘要：针对既有建筑数字化工作的资料采集难、建模规范性不足、数据核验难等问题,结合轨道交通项目特点,研究并提出既有轨道交通项目建筑信息模型(building information modeling,BIM)数据化方法。首先,结合运营运维数据需求,提出既有轨道交通项目BIM数据化与场景应用总体框架。其次,研究制定BIM建模交付技术指引,并开发BIM构件标准库,以规范既有轨道交通项目BIM模型创建。然后,结合现场数据采集情况,采取不同方法创建既有轨道交通项目BIM模型。当图纸齐全时,以图纸为基准进行建模;当图纸缺失时,研究以现场图片、点云数据等为基础,通过构件特征识别和匹配BIM构件标准库的构件单元,辅助BIM模型创建。最后,为保障BIM模型质量,研发合标性检查工具,通过内嵌BIM标准规范自动检查BIM模型,并开展现场检查复核各专业BIM模型。目前已在深圳地铁既有运营线路项目开展BIM数据化应用,积累了BIM数字资产,可为其他城市既有运营线路BIM建设提供参考。

摘要：永磁牵引电机的冷却结构设计及温升的研究对列车安全、稳定运行有着重要的意义,现以一台城轨全封闭永磁牵引电机为例,采用整机模型研究电机流固耦合传热计算,计算了电机冷却介质的流动情况、电机整机温度场分布。根据仿真计算结果,优化改进冷却结构,通过仿真进行验证计算,最终通过试验与仿真结果进行对比。研究结果表明:采用流固耦合的传热计算,能够了解电机冷却介质复杂的流动情况,电机的温度场计算准确;优化冷却结构后的电机,电机温升更加合理。

摘要：面向卫星通信、无线通信等毫米波应用的快速需求,文章详细研究了螺旋线型Q波段行波管的大功率、高效率、高增益、非线性等物理特性和设计技术。通过尺寸共度效应理论分析,研究了慢波结构的色散特性、耦合阻抗;采用了一种双渐变技术,在提高电子效率的同时兼顾高增益和良好的非线性指标;采用了主衰减,输入副衰减和切断的设计方法,有效抑制了返波振荡,以使行波管稳定工作;在互作用后电子能谱分析基础上,设计出一种五级降压收集极,收集极效率达到90%,促进了行波管总效率的提高。采用以上设计方法研制了2种Q波段螺旋线通信行波管,具体测试结果为,A型大功率行波管,Q波段(带宽2GHz),输出功率达到125W,饱和总效率达到57%,饱和增益45dB,相移小于49°,重量460 g;B型小型化行波管,Q波段(带宽4.5 GHz),饱和功率65 W,饱和总效率55%,饱和增益46 dB,相移小于45°,重量350 g。两种螺旋线型Q波段行波管满足了通信的高效率、高线性度、高增益、小型化等综合指标要求,测试参数超过公开报道的最新产品,展现出极佳的综合性能。文章所提出的设计方法为Q波段及更高频段螺旋线通信行波管研究提供了一种参考。

摘要：目的 绵竹年画作为中国四大年画之一,其相关设计需突破传统的表现形式,运用数字化手段增进用户对年画内容的深度理解,并带来更丰富的视觉体验。方法 首先通过案例研究等方法分析数字设计中的交互叙事构成要素入手,构建基于交互叙事的数字年画设计框架,然后选取我国各地流传广泛的鼠婚主题年画进行对比分析,以绵竹年画《老鼠嫁女》为例进行数字年画APP设计实践。在此基础上,通过眼动仪实验结合满意度问卷与SUS系统可用性量表对结果进行设计评价。结果 构建了数字年画设计框架,对产出的数字年画设计实践进行了评价验证。结论 运用交互叙事理论进行绵竹数字年画设计实践,旨在帮助绵竹年画获得更为广泛和深刻的传播。

摘要：Real-time monitoring of the Bragg peak location of carbon ions is urgently required for the quality control of hadron therapy. In this study, we design an annular detector to monitor the Bragg peak location of carbon ions with Geant4 simulation. This 360° surrounding structure has a high detection efficiency for the small-dose situation. The detector consists of a multilayered collimator system and an Na I scintillator for prompt gamma counting. The multilayered collimator includes a lead layer to prevent unwanted gammas and the paraffin and boron carbide layers to moderate and capture fast neutrons. An inclination of the detector further diminishes the background signal caused by neutrons. The detector, with optimized parameters, is applicable to carbon ions of different energies. In addition, the scintillator is replaced by an improved EJ301 organic liquid scintillator to discriminate gammas and neutrons. Inserting thin Fe slices into the liquid scintillator improves the energy deposition efficiency. The Bragg peak location of 200 Me V/u carbon ions can be monitored by prompt gamma detection with the improved liquid scintillator.

摘要：Antibody-directed enzyme prodrug therapy（ADEPT） is a new strategy for the treatment of cancer that has arisen in recent twenty years, the main merits of which are that it can improve the selectivity of anticancer drugs and reduce the side effects in remote tissue. In the present study, two prodrugs-glycosylated aromatic nitrogen mustard derivatives were synthesized. Glucose and lactose were converted into glycosyl donors-trichloroacetimidate; the obtained glycosyl donors were glycosylated with p-nitrophenol （ glycosyl donors） to form β-glucosyl p-nitrobenzene and β-lactosyl p-nitrobenzene that were protected by acetyl in a stereoselective manner; the two products were reduced by zinc dust and then treated with ethylene oxide, afforded two glycosylated nitrogen mustard derivatives that were protected by acetyl; the last step was to deacetylate and then afforded the two target compounds that could be used as prodrugs of ADEPT for further Anti-tumor research.

摘要：An ideal current distribution in the air core transformer coils is obtained using variation *** mountain method is utilized for optimizing the dimension and position of the real *** only can the requirement of minimizing the stray field in the plasma region be guaranteed,but also integer turns for the coil can be *** latter brings a significant convenience to engineering.