中国菊花主题花展及其对行业发展的作用

中国的菊花主题花展(菊花展览)是最重要的赏菊形式,对我国3种主要类型的菊花展览,即综合性菊花展览(中国菊花展览会、国际博览会菊花专项展和各级城市菊花展)、菊花专类园和菊花花田花海的发展现状进行了研究,并分析了菊花展览在促进菊花产业发展、弘扬菊花文化、服务生态文明及美丽乡村建设、加强菊花非物质文化遗产保护中的重要作用,为推动我国菊花展览水平的提高提供借鉴。     

Flower‐shaped ultra‐wideband fractal antenna

A flower‐shaped ultra‐wideband fractal antenna is presented. It comprises a fourth iterative flower‐shaped radiator, asymmetrical stub‐loaded feeding line, and coplanar quarter elliptical ground planes. A wide operating band of 12.12 GHz (4.58‐16.7 GHz) for S ₁₁ ≤ ? 10 dB is achieved along with an overall antenna footprint of 15.7 × 11.4 mm². In addition, other desirable characteristics, that is, omnidirectional radiation patterns, peak gain upto 5 dB, and fidelity factor more than 75% are achieved. A good agreement exists between the simulation and measured results. The obtained results illustrate that this antenna has wide operating range and compact dimensions than available structures.     

Lutein and lutein esters in marigold flowers by high performance chromatography

Lutein and lutein esters in marigold flowers was quantitatively determined by high performance chromatography (HPLC) with ODS-C18 column. A mixture of CH3CN-CH3OH-CH3COOCH2CH2 with volume ratio of 55:1:44 was used as mobile phase at a flow rate of 1.0mL/min and detection was carried out at 480 nm. The column temperature was about 20℃. The contents of lutein and lutein esters were determined by analytical curve of lutein since lutein and lutein esters have the same spectral characteristics. Determination results of hexane extracts and saponified samples of lutein show that the saponification transforms the esters into free lutein. The increase of the content of dipalmitate and palmitate stearate reveals that the reaction includes transesterifications.     

冰花镀锡在金属制品上的应用

在金属制品上获得美丽的结晶冰花,美化生活用品,已越来越为人们所重视。本文对冰花镀锡的电镀液组成,工艺参数的控制,生产过程中的故障排除作出了全面的介绍.     

Isolation,identification, and function of the Dufour gland secretion ofXylocopa virginica texana (Hymenoptera: Anthophoridae)

The Dufour's gland secretion ofXylocopa virginica texana possesses short-term repellency for conspecifics when applied to passion flowers. This secretion contains a number of straight-chain hydrocarbons. The two major components are the methyl esters of palmitic and myristic acid. A mixture of the two esters and two of the available hydrocarbons were as effective as the Dufour's gland extract in eliciting a response in females to the passion flower,Passiflora incarnata, to which the extract was applied.Approved as TA13387 by the Director, Texas Agricultural Experiment Station and conducted in cooperation with the USDA. Supported in part by NSF-DEB-76-03963.     

基于TACNN的玉露香梨叶虫害识别

为了解决玉露香梨叶虫害种类多、扩散速度快、人工识别梨叶虫害耗时长的问题,提出了能够在自然环境下对玉露香梨叶虫害图像自动识别的Tiny-Alexnet卷积神经网络（Tiny-Alexnet Convolution Neural Network,TACNN）的虫害识别模型。分析了Alexnet模型的网络结构,并将实地采集的玉露香叶片虫害图像进行统一处理,为避免全连接层卷积核参数过大而产生的过拟合现象,通过优化全连接层,设置不同神经元节点和实验参数,得出了Mid-Alexnet、TACNN两种虫害识别模型。实验结果表明：TACNN较Alexnet和Mid-Alexnet模型有较高的识别准确率,该模型能够有效地提取梨叶虫害特征,类别平均准确率为81.18%,实现了对金龟子、梨木虱、梨瘿蚊三种虫害的准确区分。该模型在玉露香梨叶虫害识别方面具有良好的性能,可实现自然环境下玉露香梨叶虫害的精准识别。     

移动平台三维花卉植物触摸反馈可视化模拟

移动平台上高交互感的三维花卉植物可视化已成为植物研究、园艺设计等领域的重要需求,但现有植物运动形变方法还不能根据触摸力度对整株花卉植物或单一叶片的受力进行不同的形变过程模拟。为此,提出一种改进的三维花卉植物触摸反馈可视化模拟方法。根据植物整株交互需求或单一叶片受力情况,研究不同方式的触摸反馈模拟方法。在模拟触摸反馈时,整株受力应用动力学原理,抽象为杆件模型并计算形变结果。单一叶片受力时,根据触摸屏获取数据,并结合叶脉骨架旋转模型算法,模拟不同力度触摸造成的叶片形变,过程中无需手动输入参数。仿真结果表明,该方法应用于移动平台后,帧速率稳定,具有较高的真实感。     

基于开关3-D中值滤波的视频序列去噪算法

为提高含噪视频序列的质量和效果,提出一种基于开关噪声检测与三维中值滤波相结合的开关3-D中值滤波算法。该算法通过判断视频序列的每一个像素点,对噪声点用3-D中值滤波处理,再对其进行二次判断,如果判为噪声点,则采用变型3-D中值滤波处理,直到去除所有噪声点为止。仿真实验表明,该算法对“雪花”噪声有较好的滤波效果,当处理加入25%的“雪花”噪声时,3-D开关中值滤波比三维中值滤波的信噪比平均提高了10 dB左右。     

Feature Selection for Detecting ICMPv6-Based DDoS Attacks Using Binary Flower Pollination Algorithm

Internet Protocol version 6 (IPv6) is the latest version of IP that goal to host 3.4 × 10³⁸ unique IP addresses of devices in the network. IPv6 has introduced new features like Neighbour Discovery Protocol (NDP) and Address Auto-configuration Scheme. IPv6 needed several protocols like the Address Auto-configuration Scheme and Internet Control Message Protocol (ICMPv6). IPv6 is vulnerable to numerous attacks like Denial of Service (DoS) and Distributed Denial of Service (DDoS) which is one of the most dangerous attacks executed through ICMPv6 messages that impose security and financial implications. Therefore, an Intrusion Detection System (IDS) is a monitoring system of the security of a network that detects suspicious activities and deals with a massive amount of data comprised of repetitive and inappropriate features which affect the detection rate. A feature selection (FS) technique helps to reduce the computation time and complexity by selecting the optimum subset of features. This paper proposes a method for detecting DDoS flooding attacks (FA) based on ICMPv6 messages using a Binary Flower Pollination Algorithm (BFPA-FA). The proposed method (BFPA-FA) employs FS technology with a support vector machine (SVM) to identify the most relevant, influential features. Moreover, The ICMPv6-DDoS dataset was used to demonstrate the effectiveness of the proposed method through different attack scenarios. The results show that the proposed method BFPA-FA achieved the best accuracy rate (97.96%) for the ICMPv6 DDoS detection with a reduced number of features (9) to half the total (19) features. The proven proposed method BFPA-FA is effective in the ICMPv6 DDoS attacks via IDS.     

传统手工抄纸工艺在当代设计领域的应用研究

目的以安徽泾县地区的手工抄纸"花笺"作为研究对象,探讨其生存现状与未来设计领域相结合的发展空间。方法通过对该地区的部分手工抄纸技艺进行实地田野调查,同时在结合传统制纸的古代历史文献及当代设计实践的基础上进行探讨。结论安徽泾县地区的手工抄纸技艺,是我国传统造纸工艺文化传承的重要物证,不仅对研究我国传统而悠久的造纸文化有着重要的实物参照价值,而且随着多个设计实践的逐步推进,使其能够充分融入当下的日常生活。通过此课题的展开,对探讨中国历史悠久的传统造物文化中纸品的传承与发扬问题,有着十分重要的现实意义。