PROTOS M5卷接机组梗签输送装置的优化设计

为解决PROTOS M5卷接机组梗签输送装置中输送管道容易堵塞问题,通过Solid Works建立管道模型,利用Fluent分析软件模拟空气在管道中流动的形态,对流体在管道中的压力和流线进行分析,得到梗签输送管道的堵塞原因并对该装置进行了优化设计:将封闭式弯管改为开放式振槽,缩短输送管道长度;增加切碎梗签功能,将较长梗签切断,避免过长梗签卡在管道弯曲处;采用直管连接梗签箱与集中负压源,减少负压损失。结果表明:1管道在最大弯曲处、同一截面上出现螺旋式流动时,或在最大弯曲处出现流速为零时,以及管道压力损失过大时,均容易造成管道堵塞。2改进后管道压力和流线分布均匀,管道压力损失由452.8 Pa减小到245.5 Pa,有效解决了梗签输送管道堵塞问题。     

高压静电场结合自发气调对低温冷藏下蒙自石榴的保鲜效果研究

针对贮藏过程中蒙自石榴皮薄、易失水及褐变问题,研究高压静电场结合自发气调技术对新鲜石榴保鲜效果的影响.以蒙自绿籽石榴为试材,在商用冷库条件下,测定呼吸强度、可溶性固形物、总酚含量、果皮水分含量等指标.结果表明:塑料大帐进行自发气调可以维持一个相对较高CO2体积分数(5.17％～7.17％)和低O2体积分数(14.0...     

多元因子分析在卷烟风格特征剖析中的应用

为了剖析卷烟风格特征,将上海、云南和河南6种卷烟的烟气化学成分按照香味特征分为辛香、甜香、果香和清香4类,应用多元因子分析(Multiple Factor Analysis,MFA)法对分类化学成分与感官评价结果进行了综合分析,并比较了采用化学成分和感官评价两种方法剖析卷烟风格特征时的一致性.结果表明:①不同的卷烟具有各自的风格特征;②MFA综合模型优于单独的化学成分和感官评价主成分分析(Principal Component Analysis,PCA);③辛香成分与感官评价结果的一致性较好,果香和甜香成分次之,清香成分差异较大.该方法适用于卷烟的质量评价与控制,可辅助卷烟生产.     

矿石T陶瓷球处理水在卷烟生产中的应用

为寻找新的改善卷烟抽吸品质的方法,研究了天然矿石T陶瓷球处理水在卷烟中的应用.结果表明:①矿石T陶瓷球处理水的pH和钙离子浓度增大,17O核磁半峰宽和水的表面张力明显减小,且随着陶瓷球用量和浸泡时间变化;②矿石T陶瓷球处理水稀释的料液添加的烟丝糖碱比较对照略上升,总碱明显降低;③矿石T陶瓷球处理水稀释的料液在降低卷烟烟气杂气和刺激性,增加甜度方面效果较好,而在提高津润感和柔和性方面效果相对较差;④矿石T陶瓷球处理水稀释料液添加的烟丝pH及其卷烟烟气常规检测指标与对照差别不大.     

雪莲果不同部位中微量元素的分析

采用火焰原子吸收光谱法连续测定了雪莲果中叶、花、果Co、Cr、Cu、Zn、Ni、Fe、Mn和Pb微量元素的含量。其方法的回收率为98.0%～107.6%,RSD值在0.36%～1.55%之间。其测定结果表明:在雪莲果中含有多种微量元素,其中叶片微量元素的含量最高,其次为花、果(块根)中微量元素含量相对较低;叶、花中微量元素含量顺序为:Fe>Zn>Mn>Cu>Co>Ni;果中微量元素含量高低顺序与叶、花有一定差异,为Mn>Fe>Cu>Zn>Ni>Co;叶、花、果中均未检测出Pb和Cr。     

A novel cuckoo search algorithm with multiple update rules

In this paper, we propose a novel cuckoo search algorithm with multiple update rules, referred to as a hybrid CS algorithm (HCS). In the presented approach, to overcome the mutual interference among dimensions and enhance the local search capability, two different one-dimensional update rules are integrated into CS framework for acquiring the candidate solutions. Moreover, using the characteristic of occasionally long jumps in Levy distribution, the proper selection between the one-dimensional update rules and Levy flight random walk is achieved by setting a limit value, so as to further enhance the exploration ability. The performance of the presented algorithm is then extensively investigated on 49 benchmark test functions including 11 common instances, 10 instances introduced in CEC 2005, and 28 instances presented in CEC 2013. The experimental results indicate that HCS algorithm is better than other CS variants in terms of solution accuracy and robustness, and it also outperforms the seven state-of-the-art intelligent algorithms.     

Vinyl-group alignment along the upper rim of a multi-component resorcin[4]arene

Cocrystallization of C-methylcalix[4]resorcinarene 1 with 4-vinylpyridine obtained from MeNO₂ yields a six-component host–guest complex 1·4(4-vinyl-pyridine)·MeNO₂ 2 in which the upper rim of 1 is extended supramolecularly by way of four O–H⋯N(pyridine) hydrogen bonds and the included solvent serves as a guest. The pyridine moieties of 2 assemble along the upper rim of 1 as two stacked dimers in which the vinyl substituents of the aromatic adopt a parallel orientation. The X-ray crystal structure of resorcinol·2(4-vinylpyridine) 3 has also been determined and reveals that the vinyl groups of 3 are aligned in an antiparallel fashion. These observations allow us to suggest that multi-component resorcin[4]arenes which possess vinyl-pyridines as cavity extenders may provide a route to aligning olefinic bonds in the solid state.     

Lag stochastic synchronization of chaotic mixed time-delayed neural networks with uncertain parameters or perturbations

This paper investigates the problem of lag synchronization for a kind of chaotic neural networks with discrete and distributed delays (mixed delays). The driver system has uncertain parameters and uncertain nonlinear external perturbations, while the response system has channel noises. A simple but all-powerful robust adaptive controller is designed to circumvent the effects of uncertain external perturbations such that the response system synchronize with the driver system. Based on the invariance principle of stochastic differential equations and some suitable Lyapunov functions, several sufficient conditions are developed to solve this problem. Moreover, under certain conditions, parameters of the uncertain master system can be estimated. Numerical simulations are exploited to show the effectiveness of the theoretical results.     

服务器集群负载均衡的建模与仿真研究

研究服务器集群负载优化调试问题,各服务器负载能力差异较大,要求尽可能使每一个服务器的负载均衡,传统方法没有考虑负载动态变化特点,导致服务器集群负载极不均衡,系统性能差。为提高集群系统的整体性能,提出一种基于遗传算法的服务器集群负载均衡算法。首先根据负载均衡目标建立数学模型,然后采用遗传算法模型进行求解。仿真结果表明,遗传算法提高了服务器集群系统吞吐量,使系统负载更加均衡,使整个集群系统的资源得到充分利用。     

液压轮胎定型硫化机可靠性研究

轮胎定型硫化机是轮胎生产制造的关键设备。针对轮胎定型硫化机重载、高精度以及高可靠性的要求,对轮胎定型硫化机进行可靠性问题进行系统研究,建立轮胎定型硫化机系统可靠性模型,提出适用于轮胎定型硫化机的可靠性评价体系。现场使用结果验证了可靠性模型和评价体系的正确性和有效性。