移动边缘计算任务卸载和基站关联协同决策问题研究

为了缩小IoT应用的服务质量要求与IoT设备有限的计算资源之间的差距,提高设备与基站能源利用率,设计了基于超密集网络的移动边缘计算框架COMED,提出了一个结合任务卸载、设备-基站关联以及基站睡眠调度的在线优化问题,旨在最小化设备和基站的整体能量消耗,同时满足IoT应用的服务质量要求.针对这一在线优化问题,提出了一个基于李雅普诺夫优化理论的任务调度算法JOSA,该算法只使用当前时间片的系统信息进行调度.仿真实验证明了COMED框架具有良好的性能：1)与设备本地处理相比,系统整体节能30%以上,与DualControl算法相比平均节能10%~50％;2)算法的执行时间与IoT设备数量呈近似线性的关系.     

通用图形处理器缓存子系统性能优化方法综述

随着工艺和制程技术的不断发展以及体系架构的日趋完善,通用图形处理器(general purpose graphics processing units, GPGPU)的并行计算能力得到了很大的提升,其在高性能、高吞吐量等通用计算应用场景的使用越来越广泛.GPGPU通过支持大量线程的并发执行,可以较好地隐藏长延时访存操作,从而获得高并行计算能力.然而,GPGPU在处理计算和访存不规则的应用时,其存储子系统的效率受到很大影响,尤其是片上缓存的争用情况尤为突出,难以及时提供计算操作所需的数据,使得GPGPU的高并行计算能力不能得到充分发挥.解决片上缓存的争用问题、优化缓存子系统的性能,是优化GPGPU性能的主要解决方案之一,也是目前研究GPGPU性能优化的主要热点之一.目前,针对GPGPU缓存子系统的性能优化研究主要集中在线程级并行度(thread level parallelism, TLP)调节、访存顺序调节、数据通量增强、最后一级缓存(last level cache, LLC)优化和基于非易失性存储(non-volatile memory, NVM)的GPGPU缓存新架构设计等5个方面.也从这5个方面重点分析讨论了目前主要的GPGPU缓存子系统性能优化方法,并在最后指出了未来GPGPU缓存子系统优化需要进一步探讨的问题,对GPGPU缓存子系统性能优化的研究有重要意义.     

Oligonucleotide Insecticides for Green Agriculture: Regulatory Role of Contact DNA in Plant–Insect Interactions

Insects vastly outnumber us in terms of species and total biomass, and are among the most efficient and voracious consumers of plants on the planet. As a result, to preserve crops, one of the primary tasks in agriculture has always been the need to control and reduce the number of insect pests. The current use of chemical insecticides leads to the accumulation of xenobiotics in ecosystems and a decreased number of species in those ecosystems, including insects. Sustainable development of human society is impossible without useful insects, so the control of insect pests must be effective and selective at the same time. In this article, we show for the first time a natural way to regulate the number of insect pests based on the use of extracellular double-stranded DNA secreted by the plant Pittosporum tobira. Using a principle similar to one found in nature, we show that the topical application of artificially synthesized short antisense oligonucleotide insecticides (olinscides, DNA insecticides) is an effective and selective way to control the insect Coccus hesperidum. Using contact oligonucleotide insecticide Coccus-11 at a concentration of 100 ng/μL on C. hesperidum larvae resulted in a mortality of 95.59 ± 1.63% within 12 days. Green oligonucleotide insecticides, created by nature and later discovered by humans, demonstrate a new method to control insect pests that is beneficial and safe for macromolecular insect pest management.     

Phellinus baumii Polyphenol: A Potential Therapeutic Candidate against Lung Cancer Cells

Phellinus baumii, a fungus that grows on mulberry trees and is used in traditional Chinese medicine, exerts therapeutic effects against various diseases, including cancer. Polyphenols, generally considered to be antioxidants, have antitumor and proapoptotic effects. In this study, we identified the composition of Phellinus baumii polyphenol (PBP) and characterized its 17 chemical components by UPLC–ESI–QTOF–MS. Furthermore, to clarify the potential mechanism of PBP against Lung Cancer Cells, network pharmacology and experimental verification were combined. Molecular docking elucidated the binding conformation and mechanism of the primary active components (Osmundacetone and hispidin) to the core targets CASP3, PARP1 and TP53. In addition, potential molecular mechanisms of PBP predicted by network pharmacology analysis were validated in vitro. PBP significantly inhibited the human lung cancer A549 cells and showed typical apoptotic characteristics, without significant cytotoxicity to normal human embryonic kidney (HEK293) cells. Analysis using flow cytometry and western blot indicated that PBP caused apoptosis, cell cycle arrest, reactive oxygen species (ROS) accumulation, and mitochondrial membrane potential (MMP) depression in A549 cells to exercise its antitumor effects. These results reveal that PBP has great potential for use as an active ingredient for antitumor therapy.     

阀门密封副摩擦学性能研究

阀门的密封性能取决于阀盘与阀座组成的密封副性能,而阀盘与阀座组成的摩擦副性能又是影响其密封性能的主要因素.通过对各种密封副进行摩擦学试验,比较了各自的摩擦学性能,发现通过对阀座材料进行等离子喷涂镍基合金以及将阀盘材料更换为超高分子量聚乙烯,可有效改善其摩擦学性能,达到改进阀门密封性能的目的.     

绿色润滑油的生态评价

主要介绍国际上对绿色润滑油的生态评价的实验方法、环境评价的原则以及环保标志的使用情况。同时对动植物油以及矿物油的生态特性进行了比较。最后对我国的环境友好润滑油的生态评价提出了建议,并对绿色润滑油的发展趋势进行了展望。     

基于InTouch组态软件的变电站自动化监控系统

介绍了Invensys旗下Wonderware公司的HMI产品InTouch在变电站监控系统中的应用.     

X射线衍射法研究大电机定子绝缘的老化过程

绝缘老化过程和老化机理的研究是电力设备绝缘状态监测和状态诊断技术的基础.本文研究绝缘常用材料云母在大电机运行应力作用下的老化过程.对300MW/18kV发电机运行23年的定子线棒绝缘进行X射线衍射实验,通过衍射图谱分析绝缘中云母晶体的化学式,探讨了云母的老化过程.结果表明:在运行应力尤其是局部放电的长期作用下,定子绝缘中所有云母晶体都发生了复杂的变化,K原子数由老化前的1减小为0.75,Al离子被Fe离子和Li离子置换,羟基被F离子置换等.但还很难解释其复杂过程.     

Preparation,Characterisation, and Rheological Behaviour of Starch-Sodium Trimetaphosphate Hydrogels

Ionic biopolymer hydrogels were prepared by the cross-linking of starches with sodium trimetaphosphate in alkaline medium at 40°C for 2 hours. The swelling capacity is relatively high — up to 310 g H₂0/g polymer. Salt solutions have a marked influence, and result in shrinkage but not in a total collapse. The effect of both the cross-linker and substrate concentrations on the swelling and rheological properties was investigated. The influence of temperature and NaOH concentration on the rheological behaviour suggests that they are both significant in determining the gel properties because of the readiness of the diester phosphate bonds to undergo hydrolysis. The molecular weight between two entanglement points (M_e) and the effectiveness of cross-linking [n_e(r)/n_e(t)] were estimated from the observed G_p′ values, and those calculated from complete conversion of the cross-linker. The effectiveness of cross-linking lay between 0.2 and 2.74% for 10% wlw gels, and reached a maximum of 48.1% at the higher substrate concentration of 20% wlw. ¹³C-NMR signals from the anhydroglucose units became broader and decreased in intensity with rising cross-linker concentration due to the restricted motion arising from the additional bonding.     

PCC在双转子连续混炼机控制系统中的应用

采用先进的PCC控制系统实现了对双转子连续混炼机的有效控制。介绍了该系统的整体方案,简述了该控制系统的特点,重点阐述了在设备运行中对混炼机、喂料机、单螺杆挤出机及切粒机等主要部件的连锁控制及对相关回路的PID控制。该系统具有友好的人机界面、操作简便、运行可靠等特点。