Quality evaluation of Panax notoginseng extract dried by different drying methods

Quality control still remains a big issue, affecting herbs, formulations, and even the practice of Traditional Chinese Medicine. A promising solution to the problem is to take advantage of innovative process techniques including alternative drying methods within the pharmaceutical processing. Nowadays, vacuum belt drying (VBD) has gained more and more importance in food and pharmaceutical processing. In this work, Panax notoginseng extract was made into powder by the gentle VBD as well as by classical spray drying (SD), freeze drying (FD), and vacuum drying (VD). Certain chemical and physical properties of the dried powders such as moisture content, drying time, porosity, density, saponins content, pH value and hydroxyl radicals scavenging activity were evaluated. The results showed the qualities of dried products were influenced to different extent by drying methods certainly. Vacuum belt drying was suggested to dry P. notoginseng extract for its high quality assurance of hygroscopic products and suitable for sticky or high viscous products.     

加权总场法在PSTD算法中的应用

伪谱时域(PSTD)方法可以处理电大尺寸目标电磁散射问题。本文介绍了一种能够把入射波有效引入PSTD计算区域的新方法——加权总场法。该方法通过引入类似于FDTD中连接边界的连接层，将计算区域划分为总场区、连接区和散射场区。为了总场区和散射场区的连续，在连接区引入窗函数．通过设置8—10层连接区就可以将入射波有效地引入到PSTD总场区。这样使入射波和目标分离，实现了复杂目标的单独建模，从而使PSTD便于模拟复杂目标的电磁散射。文中以高斯脉冲为入射波，通过二维情况下目标散射宽度的数值结果，验证了加权总场法应用于PSTD算法时的有效性和计算精度。     

CAN FD总线在交通信号控制系统中的应用设计

结合交通信号控制系统现状，提出了一套基于CAN FD总线的交通信号控制系统的研究方案，用于解决复杂交通路口多设备间的通信问题。该系统通过CAN FD总线将系统中所有设备连接起来，实现系统间各设备间正常的数据交互，以控制主机和交通信号灯驱动控制器间的通信。设备均采用内置CAN FD控制器的STM32H743系列单片机作为主控制器，在此基础上自定义了CAN FD总线应用层协议，构成了一个完整的系统间通信方案。测试结果表明，此系统可靠性高、实时性强、抗干扰能力强、出错率低，具有良好的应用前景。     

A modified stepped frequency phase coding radar waveform designed for the frequency domain algorithm

A great deal of interest has been paid to enhance the radar range resolution for the last decades. One of the techniques is to construct a waveform combining inter-pulse and intra-pulse modulations. In this paper, stepped frequency (SF) waveform is used to represent the former, whereas phase coding (PC) is considered for the latter. To obtain the high-resolution range profile (HRRP) of a target induced by an SF waveform at the receiver, one of the approaches is the frequency domain (FD) algorithm. It has been successfully applied with SF linear frequency modulation waveforms. However, based on our investigations, processing the SFPC waveform with the FD algorithm does not lead to the performance, in terms of peak sidelobe ratio (PSLR) and integrated sidelobe ratio (ISLR), of the single-carrier phase coding (SCPC) waveform processed with a matched filter (MF). To overcome these drawbacks, we propose to split the spectrum of a phase coded pulse into a predetermined number of portions, and then to successively transmit the time-domain transformed versions of these various portions. The received echoes are then processed with a modified version of the FD algorithm. Our analysis and simulations show that the proposed waveform can be characterized by a PSLR and an ISLR close to those of the SCPC processed with MF in some scenarios.     

基于虚拟区域法的竖槽内液固两相流化过程研究

该文应用分布式拉格朗日乘子／虚拟区域法对竖槽底部均匀排列的颗粒在液体内的流化过程进行了直接数值模拟，得到了流化过程中流场压力和速度矢量分布，颗粒的流化过程、位置分布和速度矢量分布等，分析了流场压力曲线和速度曲线的阶梯状分布与颗粒分布的关系，探讨了颗粒相流化过程中位置及速度分布随时间的变化。     

An adaptive neural-fuzzy inference system (ANFIS) for detection of bruises on Chinese bayberry (Myrica rubra) based on fractal dimension and RGB intensity color

This paper introduces an adaptive neural-fuzzy inference system (ANFIS) model to detect bruises on Chinese bayberries as a function of fractal dimension (FD) and RGB intensity values. The ANFIS with different types of input membership functions (MFs) was developed. Our results showed that ‘gauss2mf’ MF performs much better than other mentioned MFs for defect inspection. The classification accuracy of the ANFIS with ‘gauss2mf’ MF was 100% and 78.57% for healthy and bruised fruits, respectively, and the total correct classification rate was 90.00%. Therefore, this study indicated the possibility of developing a potentially useful classification tool using the ANFIS technique based on FD and RGB values for detecting bruises of not only Chinese bayberries, but also of other fruits during processing, storage and distribution.     

一种电子系统认证芯片的物理设计

为了防止电子产品被非法克隆复制,本文对一款利用系统认证原理对电子系统进行保护的芯片FD310S进行了物理设计。该系统认证芯片是基于华虹NEC 0.35μm三层金属工艺,采用SoC Encounter时序收敛流程进行设计,进行了包括布图规划、时序驱动布局、静态时序分析和优化、时钟树综合和时序驱动布线等步骤,最终实现了时序收敛;并且在Virtuoso环境中对其中一个形状特殊的复用I/O Pad进行了电源环的连接。该设计成功通过了设计规则检查（DRC）和版图与原理图一致性检查（LVS）。     

一个多时间粒度下时态模式的T3NF分解算法

对于时态数据库，时间维的引入使得如何有效地进行数据库设计以消除数据冗余和插入、删除异常显得尤为重要．可以通过支持多时间粒度的时态函数依赖（TFDs）约束对时态数模式进行规范化．但是多时间粒度的使用给数据库设计带来巨大的复杂性．一般来说，系统所能处理的和相当多的应用所涉及到的时态类型集满足全序关系．对于这种具有全序时态类型集的时态模式，通过分析TFD臬所具有的良好特性，给出了一个得到满足时态第三范式（T3NF）的无损分解的多项式时间的算法．     

函数依赖集F有内部冲突的判定问题研究

在讨论数据库模式R(W，F)的无α环分解时，需要判定FD集F是否有内部冲突；在讨论无β，γ环的分解时也需要判定是否有内部冲突．为此，应当首先给出归并依赖集的二元组集合、闭包等概念；分别给出求解二元组集合及其闭包的多项式算法．在此基础上，讨论FD集F有内部冲突时的特征和相关条件，给出相应的有内部冲突的判定定理和算法，对算法进行了证明和分析．     

一种可计算包含色散媒质和集总元件电路的(FD)2TD方法

现有的计算集总元件的时域有限差分方程要求电容率和电导率是不随频率变化的量。而实际上,大多数媒质的这些参数随频率显著变化。Extended FDTD方程^[1-6]在分析色散媒质中含有集总元件(电阻、电容、电感)的混合电路时遇到了困难。本文给出的Extended (FD)^2TD方法可以解决这个问题,途径是将集总参数(R、C、L)包含到与频率相关的介电常数中。这种方法可以对实际的混合电路进行全波分析,同时通过一次仿真可获得宽频域的参数。