压电双晶片型旋转精密驱动器动态特性和控制

提出了以自由端带有集中质量的悬臂式压电双晶片为驱动单元的新型冲击式旋转精密驱动器.制作了驱动器样机,建立了基于Lugre摩擦模型的驱动器动力学模型.对驱动器动态特性进行了仿真分析和实验对比研究.根据驱动器的动态特性,提出了冲击式压电双晶片型精密驱动器特定的定频调压控制方法.仿真分析结果和实验结果吻合较好,表明该动力学模型符合驱动器的动态特性,可用于对冲击式压电双晶片型旋转精密驱动器的理论分析.     

钛纳米改性聚合物防腐涂料的研究

为保护大庆油田三元复合液中油管,以钛纳米改性聚合物为主要原料,研制了钛纳米改性聚合物重防腐涂料.采用透射电子显微镜(TEM)研究了钛纳米改性聚合物平均粒径.采用正交试验法,确定最佳原料配比.采用扫描电子显微镜(SEM)研究了漆膜腐蚀.采用金相显微镜研究了钛纳米改性聚合物在漆膜中的分布.探讨了油管的腐蚀机理和钛纳米涂料的防护机理.实验结果表明:钛纳米含量为6%时,涂料具有最佳的防腐蚀效果,能很好的保护大庆油田三元复合液中的油管,并具有优异的抗化学药品介质的腐蚀性能.     

基于KPCA和SVM的火箭发动机试验台故障诊断方法

为了解决液体火箭发动机试验台的故障诊断问题,提出了一种基于核主元分析(KPCA)特征提取和支持向量多分类机(SVM)的故障诊断方法,该方法首先利用核主元分析对试验台标准故障样本进行特征提取,通过特征分析,建立适合于试验台故障状态识别的层次多分类支持向量机,并对其进行训练,然后将试验数据在主元上投影,输入到训练好的支持向量多分类器,对试验台故障状态进行识别.该方法充分利用了核主元分析强大的非线性特征提取能力和支持向量分类机良好的小样本泛化特性,解决了试验台故障诊断中的小样本、非线性模式识别问题.对试验台的试验结果表明,该方法是有效的、可行的.     

新自由主义中的政府与市场理论述评

作为凯恩斯主义的反对者,新自由主义以抵制政府干涉,提倡自由市场竞争的面目出现,在一定程度上被看做是对古典自由主义的复辟,但它绝不仅仅是对古典"放任自由"的一种简单继承。对新自由主义主流学派关于政府与市场理论进行考察,理清新自由主义理论思想,从而对其有一个更客观的认识和评价。     

Preparation and characterization of polyelectrolyte copolymers containing methyl methacrylate and 2-hydroxyethyl methacrylate. I. Polymers based on methacrylic acid

Acidic polyelectrolyte copolymers containing 2-hydroxyethyl methacrylate (HEMA), methyl methacrylate (MMA), and methacrylic acid (MAA) were prepared by free radical polymerization to high conversion in solution. Copolymer yields were obtained by gravimetry (all in the 30–50% range), relative molecular weights estimated by intrinsic viscosity measurements (all in the 50–70 cc/g range), tacticity by ¹³C nuclear magnetic resonance (NMR) spectroscopy (all polymers predominantly syndiotactic with some atactic content), and composition by acid/base titrations in conjunction with ¹H-NMR spectroscopy (all close to the monomer charge ratios). Acid strengths or apparent pKa's were examined as a function of extent of ionization. Measurements performed in water indicated that the compact/extended coil transformation in predominantly syndiotactic polymethacrylic acid occurs also in copolymers of similar tacticity containing moderate to high concentrations of MAA. The apparent pKa of such polymers containing only small amounts of MAA did not vary with extent of ionization, indicating a low degree of interaction between the acid groups. In copolymer pairs containing similar amounts of MAA but differing HEMA and MMA contents, the polymer containing more HEMA appeared the stronger acid, presumably due to a better solvation of that polymer which would increase the net spatial charge–charge separation and decrease cooperative effects that lead to suppressed ionization.     

An automatic 2D to 3D video conversion approach based on RGB-D images

3D movies/videos have become increasingly popular in the market; however, they are usually produced by professionals. This paper presents a new technique for the automatic conversion of 2D to 3D video based on RGB-D sensors, which can be easily conducted by ordinary users. To generate a 3D image, one approach is to combine the original 2D color image and its corresponding depth map together to perform depth image-based rendering (DIBR). An RGB-D sensor is one of the inexpensive ways to capture an image and its corresponding depth map. The quality of the depth map and the DIBR algorithm are crucial to this process. Our approach is twofold. First, the depth maps captured directly by RGB-D sensors are generally of poor quality because there are many regions missing depth information, especially near the edges of objects. This paper proposes a new RGB-D sensor based depth map inpainting method that divides the regions with missing depths into interior holes and border holes. Different schemes are used to inpaint the different types of holes. Second, an improved hole filling approach for DIBR is proposed to synthesize the 3D images by using the corresponding color images and the inpainted depth maps. Extensive experiments were conducted on different evaluation datasets. The results show the effectiveness of our method.

     

一种基于分段偏最小二乘模型的土壤重金属遥感反演方法

土壤中重金属由于其毒性而成为最有害的环境污染物之一,利用遥感进行土壤重金属检测和分布制图是目前最为高效的手段。采用哨兵二号（Sentinel-2）多光谱影像与实测样品光谱数据,对山西省铜矿峪铜矿尾矿库及其周边农田土壤的铜（Cu）含量进行估算,利用68个土壤样品的反射光谱,优选出适合土壤铜含量预测的波段,结合分段偏最小二乘法（Piecewise Partial Least Squares Regression,P-PLSR）,对土壤铜含量进行估算,将模型用于Sentinel-2影像获得了Cu含量的空间分布。通过P-PLSR对实测样品光谱建模反演Cu含量的决定系数（R²）为0.89,预测偏差比（RPD）为2.82;利用Sentinel-2多光谱影像获得了该区域Cu元素含量空间分布,其Cu含量的估算精度R²为0.74,RPD为1.73,Cu含量高值区空间分布与尾矿库关系密切。Sentinel-2多光谱数据具有高空间分辨率（10、20和60 m）、高时间分辨率和幅宽大（290 km）等优势,通过敏感波段选择并建立反演模型,可实现大范围土壤环境制图。     

LogGAN: a Log-level Generative Adversarial Network for Anomaly Detection using Permutation Event Modeling

Information Systems Frontiers - System logs that trace system states and record valuable events comprise a significant component of any computer system in our daily life. Each log contains...     

3元◢n◣立方体网络的◢t/k◣可诊断度研究

可诊断度是评估多处理器系统可靠性的一个关键指标.t/k诊断策略通过允许至多k个无故障处理器被误诊为故障处理器,从而极大提高了系统的可诊断度.与t可诊断度和t1/t1可诊断度相比,t/k可诊断度可以更好地反映实际系统的故障模式.3元n立方是一种性质优良并且应用广泛的网络拓扑,在许多分布式多处理器的构建中被用做底层网络.根据一些引理以及确定系统为t/k可诊断的充分条件,研究得出当n≥3及0≤k≤n,3元n立方是tk,n/k-可诊断的,其中tk,n=2(k+1)n-(k+1)(k+2).这个结果显示,在选择恰当的k值时,3元n立方的t/k可诊断度tk,n远大于其t可诊断度2n和t1/t1可诊断度4n-3.     

基于半经典量子傅里叶变换的◢t◣-比特半经典相位估计算法实现

半经典量子傅里叶变换(quantum Fourier transform,QFT)是通过测量计算线路中特定的比特,依据测量结果经过经典信息处理控制下一个比特的变换.利用半经典量子傅里叶变换思想,提出了t-比特半经典量子相位估计算法,并在IBMQ Experience量子云平台、IBMqiskit量子模拟器和国内本源悟源云平台量子模拟器上开展了不同规模的半经典相位估计实验.实验表明,该方法提高了估计精度的同时减少了算法对线路规模和两比特受控门的依赖.