摘要：Objective To optimize the extraction procedure and obtain the maximum total polysaccharide yield from Turpiniae *** Response surface methodology(RSM),combining Plackett–Burman design(PBD),steepest ascent method,and Box–Behnken design(BBD),was *** significant factors contributing to polysaccharide production were determined by *** path of steepest ascent method was performed to rapidly reach the neighborhood of the optimum *** and RSM were applied to further investigate the mutual interaction between the variables and to define the optimal *** The significant factors contributing to polysaccharide production were enzyme concentration,extraction time,and liquid-to-solid *** optimal conditions for maximal TFP were:enzyme concentration of2.8%,extraction time of41min,and liquid-to-solid ratio of27mL/*** experimental yield of3.08%was in good agreement with the model-predicted yield of3.1%under the optimized *** This study was successfully applied to optimize the extraction conditions of Turpiniae Folium polysaccharide,which can contribute to its further production and application.

摘要：Energetic particle radiation diagnoses mainly detect the particles(such as neutrons,gamma rays,hard X-rays,and escaping electrons)that are radiated in the discharge process of the experimental advanced superconducting tokamak device to characterize the operating state of the plasma in real *** upgrading of these diagnoses requires new instruments based on national(here,“national”means developed and produced by a Chinese company)core chips and open-source software with advanced digitization,a high sampling rate,and a high time *** new spectroscopy system designed in this study adopts the national field-programmable gate array(FPGA)and an analog-to-digital converter as the core chip,and it is developed using Qt on *** communication between the FPGA and embedded controller occurs via a high-speed peripheral component interconnect eXtension for instrument express protocol with a direct memory access *** this basis,the time resolution of the system is improved from 2 to 1 ms,the maximum channel address is increased to 4096,and the sampling rate is increased from 10 to 80 *** experiments of the spectroscopy system with 152Eu and 137Cs sources demonstrate that the best energy resolution is 0.27%and the measurement error is less than±0.5 keV.

摘要：Forward modeling is the basis of inversion imaging and quantitative interpretation for DC resistivity ***,a numerical model of the DC resistivity method must be finely divided to obtain a highly accurate solution under complex conditions,resulting in a long calculation time and large ***,we propose a 3D numerical simulation method in a mixed space-wavenumber domain to overcome this *** partial differential equation about abnormal potential is transformed into many independent ordinary differential equations with different wavenumbers using a 2D Fourier transform along the x axis and y axis *** this way,a large-scale 3D numerical simulation problem is decomposed into several 1D numerical simulation problems,which significantly reduces the computational and storage *** addition,these ordinary 1D differential equations with different wavenumbers are independent of each other and high parallelelism of the *** are solved using a finite-element algorithm combined with a chasing method,and the obtained solution is modified using a contraction *** this method,the vertical direction is reserved as the spatial domain,then grid size can be determined flexibly based on the underground current density distribution,which considers the solution accuracy and calculation *** addition,for the first time,we use the contraction operator in the integral equation method to iterate the *** algorithm takes advantage of the high efficiency of the standard Fourier transform and chasing method,as well as the fast convergence of the contraction *** verified the accuracy of the algorithm and the convergence of the contraction *** with a volume integral method and goal-oriented adaptive finite-element method,the proposed algorithm has lower memory requirements and high computational efficiency,making it suitable for calculating a model with large-scale ***,differ

摘要：On the eve of the occurrence of geological hazards,part of the rock and soil body begins to burst,rub,and fracture,generating infrasound signals propagating outward.3D advanced positioning of the landslide has remained unsolved,which is important for disaster *** the Fourier transform and Hankel transform of the wave equation in cylindrical coordinates,this work established a three-dimensional axisymmetric sound field model based on normal waves,and designed a 4-element helix triangular pyramid array with vertical and horizontal sampling *** on this,the three-dimensional matching localization algorithm of infrasound for geological hazards is *** the algorithm to the infrasound signal localization of rock and soil layers,it was found that the helix triangular pyramid array can achieve accurate estimation of depth and distance with a smaller number of array elements than the traditional array,and may overcome the azimuth symmetry *** study shows the application prospects of this method for predicting geohazards position several hours in advance.

摘要：为了研究乘波体和进气道的一体化技术,提出了一种新型曲外锥乘波体和进气道的一体化设计方法,在Ma5.5条件下,设计了一体化乘波前体进气道的理论构型。在设计状态,对一体化前体进气道进行了无粘数值仿真,将获得的流场结构及流动参数同理论设计结果进行了对比分析,验证了设计方法的正确性。在马赫数4,5.5和6,攻角-2°～6°内,对一体化构型的基本性能进行了无粘数值仿真,获得的结果表明,该一体化构型具有良好的气动压缩特性。给出了乘波体/进气道一体化设计的新途径,实现了乘波体和进气道符合气动规律的一体化匹配。

摘要：详细论述了掠入射非共轴反射成像的KB和KBA显微镜成像系统,根据使用要求设计了由4个反射镜组成的X射线显微镜.这是一种消像散系统,且使像面倾斜明显降低,在2 mm视场的范围内,分辨率可以达到5～7 μm.对研制过程中遇到的难题进行了分析.

摘要：介绍了基于逆置等熵轴对称喷管的三维内收缩进气道的设计方法,并对设计的进气道的气动性能进行了初步评估。轴对称逆置等熵喷管采用特征线方法生成,以3°截短逆置喷管流动为基准流场,定义进气道出口为圆形截面,采用流线追踪方法和三维造型工具,生成了三维内收缩的超声速进气道,内收缩比CR=6.18。采用自主CFD软件分析了设计的内收缩进气道性能。无粘和粘性湍流计算表明,在设计点、起动状态下流线追踪进气道出口总压恢复系数高,流动核心区较为均匀。

摘要：目的 在恶劣天气下,有效增强交通指挥手势辨识度,准确传递指挥信息,降低交通事故发生率。方法 分析交通指挥产品的现状和不足,构建交警与驾驶者的交通情境交互关系模型,洞察关键设计问题,优化交通指挥手套功能设计。探索智能织物与人体的交互方式,设计发光织物动态数字符号,增强交通手套的手势可视性,提升手套交互效果,提高交警与驾驶者之间的信息互动效率。最后根据以上分析提出设计方案。结果 基于可控发光织物的交通手套,可以有效增强手势可视性,提高交警工作效率。结论 交互关系模型有助于人们快速发现产品使用的问题点、获取相应的设计目标,为交通指挥产品设计提供新的思路,为相关研究及设计实践提供参考。

摘要：X射线掠入射显微镜的反射率除了与掠入射角有关之外,还与反射表面的粗糙度密切相关.以设计的非共轴掠入射KBA X射线显微镜系统为例,讨论了掠入射下X射线从金属表面和单层膜表面反射的两种情况.分析了波长为0.83 nm时,表面均方粗糙度(RM S)对反射率的影响,并计算了该系统的X射线反射率.分析结果表明RM S增大,反射率会降低;无氧铜的反射率为0.021,单层膜的反射率为0.049,因此KBA X射线显微镜可采用镀单层膜的方法加工.

摘要：针对高超声速飞行器后体尾喷管的优化设计问题,发展了与多目标优化程序NSGA-Ⅱ相结合的自动优化流程。利用Rao喷管的近似方法建立喷管优化模型,采用区域推进求解PNS方程的流场解算器和网格自动化生成技术获得尾喷管的性能;引入目标约束设计和自适交叉技术,自动加速目标空间的搜索,大幅度提高了多目标优化设计效率;获得了给定来流和喷流条件下的一种具有良好性能的二维后体尾喷管设计方案。