摘要：角度准直器在高能质子照相中有着重要作用,既可以利用准直器提高图像对比度,又能通过二次成像实现材料诊断及密度重建,因此减小通过准直器后通量值的误差具有重要意义.本文通过理论分析,提出了一种高能质子照相中准直器设计的方法,通过Geant4程序建立了1.6 GeV的质子成像系统,该系统分别使用理想准直器、拉伸型准直器和利用该方法设计的准直器,并对比通过客体后的通量分布.结果表明,在使用理想准直器和该方法设计的角度准直器时,二者得到的客体的通量分布符合较好,而使用拉伸型准直器时,与使用理想准直器得到的结果相差较大.因此利用理想准直器方法设计的准直器可以很好地减小通量误差.

摘要：为提高船舶合拢管再现机作业的安全性、生产效率,提升操作的易用性、舒适性,增强装备的美观性,应用JACK软件对船舶合拢管再现机进行人机交互评价。通过对船舶合拢管再现机结构组成与工作原理的分析,对其造型进行改进设计;在确定操作过程中人机交互的关键姿势节点的基础上,利用OWPA分析工具和可触及包络模块对船舶合拢管再现机的舒适性进行评价与验证,并进一步改进装备空间尺寸设计。将JACK人机交互评价应用于船舶合拢管再现机造型设计,从用户行为指导设计,有利于改善产品的人机关系,可为相关船舶装备造型设计提供参考。

摘要：概述了我国LNG接收站及其输气干线的建设现状,介绍了输气干线首站和LNG接收站设计压力的确定原则。举例说明了因输气干线首站和LNG接收站设计压力不匹配而存在的首站超压甚至管道爆裂的潜在危险,分析了传统解决措施的弊端,认为本质安全的解决方案是将首站设计压力提高到与接收站外输系统的设计压力一致。

摘要：根据强流电子加速器的需要，研制了一种高电压长寿命两电极气体开关。该开关采用防污染设计，将开关电极与金属腔体进行一体化设计，并采用金属挡板对绝缘封盖进行防污保护，从最大程度上减小了开关工作时电极材料喷射对绝缘支撑物的污染，提高了开关寿命。运用ANSYS软件优化设计了电极结构。该开关在0．1～0．2MPa气压条件下，工作电压为32～42kV，单次脉冲电荷转换量0．38～0．48C，工作稳定。

摘要：参数化方法是翼型设计的重要方法。在翼型设计阶段,参数化模型中的变量通常认为在一定区间内变化,并进行离散化。参数化模型的变量较多时,设计样本空间大,计算量大。本文提出一种翼型的随机参数化设计方法,采用类/形函数变换方法参数化翼型,参数化模型的变量为服从一定概率分布的随机变量,基于不确定性量化方法与CFD模拟获得翼型气动性能的统计特性。将此方法与OpenFOAM耦合,对S809翼型进行了随机参数化建模,比较了蒙特卡洛、拉丁超立方和基于稀疏网格的多项式混沌法与CFD结合的精度和效率。结果表明基于稀疏网格的多项式混沌法收敛速度快和精度高,可以大幅减小高维设计变量下的计算量;通过敏感性分析寻找了影响翼型气动性能的主要设计变量。

摘要：研究了一个强非线性发展方程.利用同伦映射方法,首先构造了相应的同伦变换;其次选取了适当的初始近似;再用迭代方法得到了孤波的任意次精度的近似解.

摘要：根据各向异性媒质理论,设计了一种宽带、反射型超材料极化旋转体,能够将线极化波极化方向旋转90?,极化转化率大于90%的工作带宽为5.5—14.5 GHz.该极化旋转体由两层介质板、金属双开口谐振环和金属底板周期排列构成,具有各向异性的特点,单元两对角线方向的电场分量反射系数相同,反射相位相差180?,导致其极化旋转特性.利用表面电流分布图,分析不同极化波入射时该极化旋转体的谐振状态,实验和仿真结果符合较好.该极化旋转体在新型天线设计和隐身技术等方面具有广阔的应用前景.

摘要：Backfill mining is one of the most important technical means for controlling strata movement and reducing surface subsidence and environmental damage during exploitation of underground coal resources. Ensuring the stability of the backfill bodies is the primary prerequisite for maintaining the safety of the backfilling working face, and the loading characteristics of backfill are closely related to the deformation and subsidence of the roof. Elastic thin plate model was used to explore the non-uniform subsidence law of the roof, and then the non-uniform distribution characteristics of backfill bodies’ load were revealed. Through a self-developed non-uniform loading device combined with acoustic emission (AE) and digital image correlation (DIC) monitoring technology, the synergistic dynamic evolution law of the bearing capacity, apparent crack, and internal fracture of cemented coal gangue backfills (CCGBs) under loads with different degrees of non-uniformity was deeply explored. The results showed that: 1) The uniaxial compressive strength (UCS) of CCGB increased and then decreased with an increase in the degree of non-uniformity of load (DNL). About 40% of DNL was the inflection point of DNL-UCS curve and when DNL exceeded 40%, the strength decreased in a cliff-like manner;2) A positive correlation was observed between the AE ringing count and UCS during the loading process of the specimen, which was manifested by a higher AE ringing count of the high-strength specimen. 3) Shear cracks gradually increased and failure mode of specimens gradually changed from “X” type dominated by tension cracks to inverted “Y” type dominated by shear cracks with an increase in DNL, and the crack opening displacement at the peak stress decreased and then increased. The crack opening displacement at 40% of the DNL was the smallest. This was consistent with the judgment of crack size based on the AE b-value, i. e., it showed the typical characteristics of “small b-value-large crack and

摘要：Supercontinuum(SC) generation in a dispersion-shifted fiber(DSF) pumped by a 10 GHz regeneratively mode-locked fiber laser(RMLFL) is *** of pump wavelength leads to a 20 dB bandwidth of 58.73 nm,which covers the whole C band and part of L *** an angle-tuning thin film filter,multi-wavelength and pico-second pulse trains of low chirp could be chosen from the SC *** spontaneous emission(ASE) induced degeneration of the achieved pulse trains is observed and discussed.

摘要：针对微生物检测中存在的耗时多、结构复杂、探测精度低等问题,提出了一种快速、简单、检测下限低的微生物检测方法。通过结合荧光标记物标记、微孔滤膜过滤、激光扫描及荧光成像技术,设计了痕量微生物快速扫描检测系统,使用大视场、大景深、长焦距扫描物镜,结合二维扫描振镜,完成了对痕量微生物样本的快速检测。描述了检测系统的基本原理及光路系统的设计与优化,对采集信号进行了分析,并对检测系统的检测性能进行了论证及测试。实验结果表明,该检测系统可以在10min内完成对10～2.5×10^3 cfu/mL的微生物的准确检测,检测下限为10cfu/mL,可以满足医用高纯水、饮料用水、微电子加工高纯水等领域的水体快速检测需求。