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Thermoresponsive behavior and rheology of SiO2–hyaluronic acid/poly(N‐isopropylacrylamide) (NaHA/PNIPAm) core–shell structured microparticles 下载免费PDF全文
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席夫碱结构对Cu缓蚀作用的影响 总被引:2,自引:0,他引:2
用自组装技术使席夫碱在Cu表面自组装成膜,用扫描电子显微镜(SEM)、交流阻抗方法及量子化学法研究了席夫碱结构对Cu缓蚀作用的影响.结果表明:席夫碱类化合物在发挥其活性时应以接受电子为主,此类化合物的亚胺或甲亚胺特性基团(-RC=N-)和苯环上的-OH是该类化合物的主要活性区,席夫碱苯环的-H被给电子基团取代会提高对Cu的缓蚀效率,且取代基团越靠进-C=N-,形成的螯合物越稳定,缓蚀效率越高. 相似文献
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基于FPGA的PCI总线接口设计 总被引:1,自引:0,他引:1
论文介绍一种使用PCI宏核逻辑进行高效PCI接口设计的方法。该方法将PCI接口逻辑和PCI用户逻辑集成在一片FPGA里,可以对整个逻辑进行仿真调试,大大缩短了开发周期,提高了系统集成度和性能。文章重点介绍了PCI接口逻辑的结构原理,分析了时序设计的要点,并给出了一种典型应用的软硬件设计方案和仿真结果。 相似文献
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近几年来,我国水泥原料矿山的安全事故时有发生。如西南某矿发生滑坡,造成机毁人亡事故;华东某矿发生崩塌,造成多人伤亡事故。重视矿山安全,已是一个十分重要的问题。 相似文献
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Lin Feng Meng Xiangyan Tang Ke Wu Lishun Yuan Ruting Liao Lijun 《Journal of Materials Science》2021,56(24):13590-13603
Journal of Materials Science - The design of the hierarchical structure and geometry of nanomaterials at the molecular and macroscopic level are crucial to determine their properties and... 相似文献
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Service outsourcing is very common in a commercial supply chain, and in humanitarian relief area, the transportation service is usually outsourced. To practice relief supply more effectively, it seems essential to enlarge outsourcing from shipping to more areas, and private enterprises could play a vital role. This paper examines the optimal pre-disaster order quantity of a certain relief commodity, based on a two-stage coordinated approach. Our findings show that the delay cost, shortage penalty cost, risk of supply shortage, salvage value, expected perishable rate, unit inventory cost and reactive price have significant impacts on the optimal amount of propositioned inventory. Moreover, the outsourcing strategies differ by types of relief commodities. For perishable supplies, proactive or reactive outsourcing would improve the benefits of buyer and supplier simultaneously. As for imperishable supplies, it is better to combine proactive insourcing approach and reactive outsourcing strategy. In view of some supplies whose monitoring cost is high, the insourcing approach is much better than the outsourcing approach. 相似文献
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采用Shewanellaoneidensis MR-1合成Fe2O3/TNTs纳米复合材料,通过高分辨透射电子显微镜、扫描电子显微镜、X射线衍射仪、X射线光电子能谱仪、紫外-可见分光光度计等对Fe2O3/TNTs的结构和性能进行表征。结果表明,Fe2O3成功负载在TiO2纳米管上;在紫外光照射下,Fe2O3/TNTs在60min内对苯胺蓝的脱色率可达到97.5%,表现出较好的光催化活性。Shewanellaoneidensis MR-1协同Fe2O3/TNTs纳米复合材料对苯胺蓝脱色率较So.neidensis MR-1提高了1.63%。 相似文献
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Personalized hand models can be utilized to synthesize high quality hand datasets, provide more possible training data for deep learning and improve the accuracy of hand pose estimation. In recent years, parameterized hand models, e.g., MANO, are widely used for obtaining personalized hand models. However, due to the low resolution of existing parameterized hand models, it is still hard to obtain high-fidelity personalized hand models. In this paper, we propose a new method to estimate personalized hand models from multiple hand postures with multi-view color images. The personalized hand model is represented by a personalized neutral hand, and multiple hand postures. We propose a novel optimization strategy to estimate the neutral hand from multiple hand postures. To demonstrate the performance of our method, we have built a multi-view system and captured more than 35 people, and each of them has 30 hand postures. We hope the estimated hand models can boost the research of high-fidelity parameterized hand modeling in the future. All the hand models are publicly available on www.yangangwang.com . 相似文献
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Robust finite‐time consensus formation control for multiple nonholonomic wheeled mobile robots via output feedback 下载免费PDF全文
The finite‐time formation control for multiple nonholonomic wheeled mobile robots with a leader‐following structure is studied. Different from the existing results, the considered mobile robot has the following features: (i) a higher‐order dynamic model, (ii) the robot's velocities cannot be measured, and (iii) there are external disturbances. To solve the problem, a finite‐time consensus formation control algorithm via output feedback is explicitly given. At the first step, some finite‐time convergent observers are skillfully constructed to estimate both the unknown velocity information and the disturbance in finite time by imposing certain assumptions on the disturbances. Then, on the basis of the integral sliding‐mode control method, a disturbance observer‐based finite‐time output feedback controller is developed. Rigorous proof shows that the finite‐time formation can be achieved in finite time. An example is finally given to verify the efficiency of the proposed method. 相似文献