轴流风机在高大平房仓保水通风降温中的应用探讨

利用冬季低温天气,开启小功率低风压的轴流风机对安全水分以下的小麦粮堆进行通风,降温效果明显且能耗较低,粮堆水分基本不变。     

冠县灵芝多糖的分离纯化、结构表征及抗氧化活性研究

以冠县灵芝为研究对象,采用传统浸提法获得水溶性灵芝多糖GLP,经Sevag法去蛋白及活性炭脱色,然后依次采用Capto TM DEAE离子柱层析和Superdex 6 prep Grad凝胶柱层析进行分离纯化,获得均一多糖GLPS80a,经高效凝胶色谱(HPGPC)法检测,其相对分子量为9024 Da,高效阴离子色谱(HPAEC)、红外光谱(FT-IR)和核磁共振(NMR)图谱分析结果表明,GLPS80a是由岩藻糖(Fuc)、氨基葡萄糖(GlcN)、半乳糖(Gal)、葡萄糖(Glc)、木糖(Xyl)、甘露糖(Man)和葡萄糖醛酸(GluA)等7种单糖组成,摩尔比为0.06:0.23:0.17:1.00:0.08:0.19:0.23,主要以β-D-(1,6)糖苷键连接的吡喃糖为主要组成且不含三股螺旋的酸性多糖。抗氧化结果表明,GLPS80a具有一定的DPPH自由基、OH自由基和ABTS+自由基的清除能力,它们的EC₅₀分别为7.40、8.74和0.33 mg/mL,还原力RP_0.5AU为8.33 mg/mL。本研究将为合理开发冠县灵芝资源和精深...     

电气工程自动化技术在矿山工程中的应用研究

针对传统技术效率较低的问题,为此提出电气工程自动化技术在矿山工程中的应用研究。利用PLC技术控制井下风门开关,确保井下风门内外气压相同;通过JIK系列盘式可控制动装备对矿山机电设备运行情况进行实时监控;将控制器和变频器代替传统的继电器,实现对矿山提升机的改造;运用传输机对矿山资源进行自动化装卸,提高矿山工程施工效率;在矿山排水系统中应用电气工程自动化技术,对水泵排水情况进行自动化控制。     

基于非局部自相似性和低秩矩阵逼近的补全算法

针对传统矩阵补全算法在图像重建方面的不足,提出了一种基于非局部自相似性和低秩矩阵逼近（NL-LRMA）的补全算法。首先,通过相似性度量找到图像中局部块所对应的非局部相似块,并将相应灰度信息进行向量化,从而构建出非局部相似块矩阵;然后,针对所得相似矩阵的低秩性,对其进行低秩补全操作（LRMA）;最后,对补全结果进行重新组合,以达到恢复原始图像的目的。在灰度图像以及RGB图像上进行重建实验,结果表明：在经典数据集上,NL-LRMA算法要比原LRMA算法在平均峰值信噪比（PSNR）上高出4~7 dB;同时,新算法在视觉效果与PSNR值方面也明显优于迭代重加权核范数（IRNN）、加权核范数（WNNM）、LRMA等传统算法。总之,所提算法对传统算法在自然图像重建方面的不足进行了有效弥补,从而为图像重建提供了一种行之有效的解决方案。     

Design,Synthesis, and Biological Activity of Novel Aromatic Amide Derivatives Containing Sulfide and Sulfone Substructures

In recent years, the damage caused by soil nematodes has become increasingly serious; however, the varieties and structures of the nematicides available on the market are deficient. Fluopyram, a succinate dehydrogenase inhibitor (SDHI) fungicide developed by Bayer AG in Germany, has been widely used in the prevention and control of soil nematodes due to its high efficiency and novel mechanism of action. In this paper, two series of novel target compounds were designed and synthesized with nematicidal and fungicidal fluopyram as the molecular skeleton in order to introduce sulfide and sulfone substructures. The structures were identified and characterized by ¹H nuclear magnetic resonance (NMR), ¹³C NMR, and high-resolution mass spectrometer (HRMS). The bioassays revealed that most of the compounds showed excellent nematicidal activities at 200 µg·mL⁻¹ in comparison with fluopyram, while the nematode mortality rate dropped sharply at 100 µg·mL⁻¹, except for compounds I-11 and II-6. In terms of fungicidal activity, compound I-9 was discovered to have an excellent inhibitory rate, and a molecular docking simulation was performed that can provide important guidance for the design and exploration of efficient fungicidal lead compounds.     

Scaling behavior of dynamic hysteresis in multiferroic Bi5FeTi3O15 thin films

Journal of Materials Science: Materials in Electronics - In this study, Bi5FeTi3O15 (BFTO) thin films were obtained on silicon wafers using a sol–gel process. Advanced multiferroic...     

Dissolved Oxygen Model Predictive Control for Activated Sludge Process Model Based on the Fuzzy C-means Cluster Algorithm

International Journal of Control, Automation and Systems - In this work, the problem of predictive control of dissolved oxygen for the activated sludge process model with high nonlinearity and...     

Exponential Stabilization of Delayed Complex-valued Neural Networks with Aperiodic Sampling: A Free-matrix-based Time-dependent Lyapunov Functional Method

International Journal of Control, Automation and Systems - In this paper, the exponential stabilization of delayed complex-valued neural networks (DCNNs) is addressed via sampled-data control....     

运用有限元理论对JG21—63A开式压力机机身静态特性分析

利用大型有限元分析软件ANSYS,以开式压力机机身为研究对象,对JG21—63A开式压力机进行三维建模．应用ANSYS有限元分析软件对机身结构进行强度和刚度分析,从而获得了机身的等效应力分布和等效位移分布规律,并根据分析结果,对结构进行优化,从而达到减轻自重的目的,为结构的合理设计与改进提供了可靠的依据．