导弹水面热分离过程运载器内流分析

针对导弹与运载器水面动态热分离过程,导弹喷流在运载器内腔的流动特性与流场特点进行较详细的分析研究,并分析讨论了运载器电气控制系统组件在内腔的气动布局问题.有关研究结果在某导弹与运载器的水面分离性能设计与分离力学环境改善优化中得到应用.     

葡萄籽提取物复合胶囊的免疫调节作用研究

经口连续灌胃30 d,采用免疫器官重量法、小鼠迟发型超敏反应、溶血素测定法、单核吞噬细胞功能测定法(小鼠碳粒廓清法)等方法,考察了葡萄籽提取物复合胶囊的免疫调节作用.结果表明,与阴性对照组比较,各剂量组小鼠体重、小鼠脾脏/体重比值和胸腺/体重比值无明显差异,高剂量组小鼠的细胞免疫功能、体液免疫功能及非特异性免疫功能显著提高,证明葡萄籽提取物复合胶囊具有增强小鼠免疫功能的作用.     

人体胶囊式无线内窥微机电系统的设计与工作寿命研究

在设计人体胶囊式无线内窥微机电系统过程中,通过理论分析和实验测试,研究了影响系统工作寿命的图像传感器选用、无线发射电路配置、控制方式选择,以及电源系统的设计问题.选用了CMOS图像传感器,精确合理地配置了无线发射功率,设计了灵活省电的永磁场控制方式,选择了锂锰钮扣电池和其电池组构成电源系统,研制出了微体积、易于控制、有较好图像质量、较长工作寿命的人体胶囊式无线内窥微机电系统,给出的由该系统在实验室条件下和动物实验中采集的图像及测试参数表明设计方案是可行的.     

Capsular exopolysaccharide biosynthesis gene of Propionibacterium freudenreichii subsp. shermanii

In the dairy industry, exopolysaccharides (EPS) contribute to improving the texture and viscosity of cheese and yoghurt and also receive increasing attention because of their beneficial properties for health. For lactic acid bacteria, the production of EPS is well studied. However, for dairy propionibacteria the biosynthesis of EPS is poorly documented. A polysaccharide synthase-encoding gene was identified in the genome of Propionibacterium freudenreichii subsp. shermanii TL 34 (CIP 103027). This gene best aligns with Tts, the polysaccharide synthase gene of Streptococcus pneumoniae type 37 that is responsible for the production of a beta-glucan capsular polysaccharide. PCR amplification showed the presence of an internal fragment of this gene in twelve strains of P. freudenreichii subsp. shermanii with a ropy phenotype in YEL+ medium. The gene sequence is highly conserved, as less than 1% of nucleotides differed among the 10 strains containing the complete gtf gene. The same primers failed to detect the gene in Propionibacterium acidipropionici strain TL 47, which is known to excrete exopolysaccharides in milk. The presence of (1-->3, 1-->2)-beta-d-glucan capsule was demonstrated for 7 out of 12 strains by agglutination with a S. pneumoniae-type 37-specific antiserum. The presence of mRNA corresponding to the gene was detected by RT-PCR in three strains at both exponential and stationary growth phases. This work represents the first identification of a polysaccharide synthase gene of P. freudenreichii, and further studies will be undertaken to elucidate the role of capsular EPS.     

顶空固相微萃取—气相色谱法测定有机氯农药的研究

建立项空固相微萃取气相色谱法测定抗氧化肽胶囊中的有机氯农药新方法。以顶空固相微萃取为样品的前处理手段。结合气相色谱,电子捕获检测器同时测定抗氧化肽胶囊中的18种有机氯农药。通过对萃取方式、萃取头类型、萃取时间和温度、解析温度和时间等影响萃取效率的因素的研究,获得优化的试验条件。在优化条件下,方法的线性较好,样品的加标回收率在90％～120％之间,相对标准偏差小于10％。该方法适用于胶囊型保健品中的痕量有机氯农药的测定。     

步长脑心通胶囊治疗急性脑梗死的神经保护作用

目的评价步长脑心通的临床疗效,验证其治疗急性脑梗死的神经保护作用机制。方法选用86例脑梗死急性期患者,随机分为治疗组与对照组,每组均连续服药2周为一个疗程。并于用药前时及用药后4周时测定患者血中ICAM-1、兴奋性氨基酸(EAA)的含量以及神经功能的评定。结果步长脑心通能显著降低患者血清中ICAM-1及EAA的水平,其作用优于益脑复健胶囊;步长脑心通能显著促进脑梗死患者神经功能的恢复,其作用优于益脑复健胶囊。结论步长脑心通对急性脑梗死有良好的脑保护作用。其作用机制在于通过降低局部脑组织中的ICAM-1、EAA的表达水平,从而减轻缺血性炎症反应,起到对缺血脑组织的神经保护作用。     

飞机失事后救生舱氧气系统的数学建模仿真

建立飞机中救生舱氧气控制模型,可实现飞机失事后救生舱中氧气浓度得精确控制.飞机失事后面临的破坏性和环境都是大随机事件,救生舱氧气系统的控制需要对压力、气体温度和氧气系统参数的时间差数据的准确掌握,实现氧气系统性能的定量评估,由于参数容易受到失事时外部环境的影响,无法预先设定.传统的氧气系统控制模型无法准确评估参数在恶化环境下的变化过程,仅能通过设定固定参数评估短期机组氧气性能变化情况,存在较大缺陷.提出采用改进遗传算法的自抗扰控制器氧气系统参数优化模型,塑造考虑控制约束的自抗扰控制器参数优化设计目标函数,并用一种改进自适应混沌遗传算法对氧气系统参数进行整定,实现失事飞机救生舱内氧气系统的有效控制.仿真结果表明,所提控制模型增强了系统的动态性和静态性,可有效应对系统参数的动态性,具有较高得控制性能.     

基于胶囊网络的动态路由研究与改进

胶囊网络具有弥补卷积神经网络空间信息丢失和旋转不变性差的优点,已被广泛应用于图像分类、目标检测以及文本检测等多个领域,但胶囊网络仍存在参数量大且分类精确度低的问题。提出基于点乘注意力图卷积路由的胶囊网络分类模型。在同级胶囊之间构建连通图,通过注意力机制获取胶囊间的依赖关系,利用影响因素大的预测胶囊进行特征聚类,改变使用迭代更新高低胶囊层间耦合系数的动态路由方式,降低参数量并提升模型的分类准确率。此外,在特征提取部分加入残差网络提取更高维的特征以优化胶囊质量,在提升模型特征表达能力的同时可抑制模型过大。实验结果表明,在参数量小于多个胶囊网络变体的情况下,该模型在MNIST、FashionMNIST、CIFAR10和SVHN数据集上的精度分别达到99.74%、95.02%、91.78%和95.65%,均高于MS-CapsNet、TextCaps、AR CapsNet、FSc-CapsNet、DA-CapsNet等对比模型。     

Facial Expression Recognition through person-wise regeneration of expressions using Auxiliary Classifier Generative Adversarial Network (AC-GAN) based model

Recently, Facial Expression Recognition (FER) has gained much attention in the research area for its various applications. In the facial expression recognition task, subject-dependent issue is predominant when a small-scale database is used for training the system. The proposed Auxiliary Classifier Generative Adversarial Network (AC-GAN) based model regenerates ten expressions (angry, contempt, disgust, embarrassment, fear, joy, neutral, pride, sad, surprise) from input face image and recognizes its expression. To alleviate the subject dependence issue, we train the model person-wise and generate all the above expressions for a person and allow the discriminator to classify the expressions. The generator of our model uses U-Net Architecture, and the discriminator uses Capsule Networks for improved feature extraction. The model has been evaluated on the ADFES-BIV dataset yielding an overall classification accuracy of 93.4%. We also compared our model with the existing methods by evaluating our model on commonly used datasets like CK+, KDEF.     

HPLC法测定藿香清胃胶囊中甘草酸的含量

目的:建立测定藿香清胃胶囊中甘草酸含量方法.方法:采用高效液相色谱法,以BDS-C18色谱柱分离,以甲醇:0.2mol/L醋酸铵溶液:冰醋酸=62:38:1为流动相,流速为1.0ml/min,检测波长250nm.结果:甘草酸在0.3616～1.8080μg范围内线性良好,r=0.9996;测得平均回收率98.68%,RSD=2.20%.结论:高效液相色谱法高效、快速、灵敏,可作为藿香清胃胶囊质量控制的有效方法.