网目纹图像考——从永乐宫纯阳殿藻井彩画出发

从永乐宫纯阳殿内的藻井彩画为原点,对网目纹图像进行了初步考究。可知其源自佛教艺术,早在唐代便流行于新疆、甘肃一带,发展至西夏、辽、金时期则进一步应用在建筑彩画上,通过莫高窟第148窟所绘的“浪花”网目纹头光,以及藻井“以水压火”的寓意,推论网目纹的含义为“水波”。

史前纹样的诠释

在古代艺术研究领域,学者常以为设计和纹饰母题有“自然含义”,现代的观察者不需要了解其文化就能释读。例如,在古代美索不达米亚、史前的巴西直至现代的广告上都能看到双目纹,学者断定其表达了辟邪的愿望。本文的观点与之相反。一个古代母题的制作者或其文化所赋予的象征意义,从来都不是这个母题所固有的,而是出于当事人的自由选择。因此,在缺乏有关制作者的动机或指示的记录时,我们今天就无法给予古代双目纹的含义。

殷墟目字纹在现代灯饰设计中的应用研究

立足于殷商时期青铜器上的目字纹,探索目字纹在现代灯饰设计中的应用方法,丰富室内装饰的表现手法,提升文化氛围。通过研究殷墟目字纹的文化内涵,从造型法则的角度分析其图文兼顾的视觉语言、对称与均衡、比例与尺度的形式美法则,进而探索在现代灯饰设计中应用的可能性,并结合当代人群对灯饰的设计需求,以点、线、面、体的构成手法进行再设计。殷墟目字纹在现代灯饰设计中可以应用于造型与装饰图案,为现代灯饰的设计方法与理念填补空白。

商周青铜器四瓣目纹初探

四瓣目纹是口纹的一种,流行于商代晚期至西周早期,西周早期以后消失。依据抽象程度的不同以及整体形态的区别,四瓣目纹可以分为两类五型十二式。四瓣目纹的发展演变可以分为三期四段。四瓣目纹装饰器类丰富,表现形式富于变化,极具艺术创造力。四瓣目纹的文化内涵耐人寻味,可能象征着天、地、人三元和谐共存的寓意。

辽宁义县奉国寺大雄殿建筑彩画纹饰研究

辽宁义县奉国寺大雄殿的建筑彩画是现存彩画中的精品,完整地反映了辽代建筑彩画的原貌,其中的纹饰具有辽代纹饰的典型特征。通过对彩画中网目纹、凤纹、缠枝花、莲花纹、柿蒂纹的整理,并与同时期和近似纹饰进行对比分析,能够对辽代纹饰的风格特征有客观的认识。

A New Record Genus Polyamia DeLong,with Two New Species (Hemiptera:Cicadellidae:Deltocephalinae) from China

In the present paper, Polyamia DeLong is firstly recorded with two new species ——Polyamia penistenuis, sp. nov. and Polyamia drepananiforma, sp. nov. from China. The type specimens are deposited in the Entomological Museum of the Northwest Sci-Tech University of Agriculture and Forestry, Yangling, Shaanxi, China.

Fast estimation of fundamental matrix based on stripe constraints

In order to improve the performance of estimating the fundamental matrix, a key problem arising in stereo vision, a novel method based on stripe constraints is presented. In contrast to traditional methods based on algebraic least-square algorithms, the proposed approach aims to minimize a cost function that is derived from the minimum radius of the Hough transform. In a structured-light system with a particular stripe code pattern, there are linear constraints that the points with the same code are on the same surface. Using the Hough transform, the pixels with the same code map to the Hough space, and the radius of the intersections can be defined as the evaluation function in the optimization progress. The global optimum solution of the fundamental matrix can be estimated using a Levenberg- Marquardt optimization iterative process based on the Hough transform radius. Results illustrate the validity of this algorithm, and prove that this method can obtain good performance with high efficiency.

Three species in the genus Falseuncaria Obraztsov & Swatschek(Lepidoptera:Tortricidae:Cochylini) new to China

Three species in the genus Falseuncaria are newly recorded for China： F. degreyana （McLachlan, 1869）, E lechriotoma Razowski, 1970 and F. ruficiliana （Haworth, I1811 ]）. Descriptions, images of adults and genitalia are provided, along with a key and a distribution map to the described Chinese species.

Object detection of artifact threaded hole based on Faster R-CNN

In order to improve the accuracy of threaded hole object detection,combining a dual camera vision system with the Hough transform circle detection,we propose an object detection method of artifact threaded hole based on Faster region-ased convolutional neural network(Faster R-CNN).First,a dual camera image acquisition system is established.One industrial camera placed at a high position is responsible for collecting the whole image of the workpiece,and the suspected screw hole position on the workpiece can be preliminarily selected by Hough transform detection algorithm.Then,the other industrial camera is responsible for collecting the local images of the suspected screw holes that have been detected by Hough transform one by one.After that,ResNet50-based Faster R-CNN object detection model is trained on the self-built screw hole data set.Finally,the local image of the threaded hole is input into the trained Faster R-CNN object detection model for further identification and location.The experimental results show that the proposed method can effectively avoid small object detection of threaded holes,and compared with the method that only uses Hough transform or Faster RCNN object detection alone,it has high recognition and positioning accuracy.

Research on Face Tracking in Community Monitoring System

This paper proposes a block Mean-Shift algorithm based on target real-time update and LBP texture features, through the target update improves the accuracy of target tracking, enhances the local character of the target through the target block, so as to improve the robustness of algorithm based on skin color backgrounds. And then analyze the Mean-Shift algorithm cannot recover quickly lost target tracking defects, and its improvement by combining the frame difference method.

Target Region Location Based on Texture Analysis and Active Contour Model

Traditional texture region location methods with Gabor features are often limited in the selection of Gabor filters and fail to deal with the target which contains both texture and non-texture parts.Thus,to solve this problem,a two-step new model was proposed.In the first step,the original features extracted by Gabor filters are applied to training a self-organizing map(SOM) neural network and a novel merging scheme is presented to achieve the clustering.A back propagation(BP) network is used as a classifier to locate the target region approximately.In the second step,Chan-Vese active contour model is applied to detecting the boundary of the target region accurately and morphological processing is used to create a connected domain whose convex hull can cover the target region.In the experiments,the proposed method is demonstrated accurate and robust in localizing target on texture database and practical barcode location system as well.

Three-Dimensional Visual Analysis for Construction Layout of Reservoir Project

It is difficult to analyze the inter-relationship for the construction layout of a reservoir project scientifically and intuitively.According to the characteristics of broad field and huge information,the modeling methods of digital terrain and solid model as well as the techniques of texture mapping and scene navigation are adopted.The simulation system is developed by C program language,which includes the functions of the interactive navigation of 3D scene,the visual inquiry of project digital model information,the storage and management of project information.A certain reservoir is taken as a case.The 3D visual analysis for the construction layout and engineering information are obtained.The proposed system is of great advantages in dealing with large amount of information and the method provides a theoretical basis and technical support for the construction layout of a reservoir project.

A Suggestion to Make Gurson Damage Model Mesh Independent for Cracked Specimens

Continuum damage mechanics is applied to compute fracture J-initiation and J-Resistance （J-R） curve for 20MnMoNi55 material by analyzing TPB and CT specimens. A strong mesh dependency of Gurson model is observed. The exponential form of q2 parameter shown earlier near crack tip is further modified to have a variable asymptotic value q2a away from crack tip. The asymptotic value q2a is suggested to be a function of crack-tip mesh size to overcome mesh dependency of J-R and load-displacement curves. The relation between q2a with the normalized crack-tip mesh size is determined numerically for CT and TPB specimens.

Lethal and Sublethal Effects of Leaves Extracts from Native and Exotic Plants in Southern Brazil against Spodoptera frugiperda （Lepidoptera： Noctuidae） Caterpillars

The caterpillar Spodopterafrugiperda is an important pest of several crops, due to the damage it causes and the difficulty of its control. The method of controlling these pests is through chemical insecticides, which cause adverse effects to the biotic and abiotic environment. The selection of new insecticides that meet the requirements of efficacy, safety, selectivity and those are economically viable, is highlighting the study of mechanisms of plant defense. The present study aimed to verify the insecticide effect of 27 plants in three different types of plants extracts： aqueous, decoction and polypeptide on S. frugiperda. Three plants were chosen for performing sublethal effects bioassays： two plants with the highest corrected mortality （E. pulcherrima and R. simsii） and the other plant （Maytenus ilicifolia （espinheira santa）） with corrected mortality similar to control. In preliminaries bioassays, 25 plants showed corrected mortality less than 50%, according to Abbott＇s formula. R. simsii （azalea） and E. pulcherrima （billed parrot） showed 51% and 68% of corrected mortality, respectively. Only R. simsii aqueous and the three extracts of E. pulcherrima differ significantly from control （P 〈 0.05）. The aqueous extracts and decoction of R. simsii and polypeptide extract of E. pulcherrima reduced the larval period of S. frugiperda, different from control （P 〈 0.05）. The polypeptide extract of R. simsii reduced the pupal period of the target insect. The extracts obtained by decoction, aqueous and polypeptide of E. pulcherrima extracts and decoction of polypeptides and R. simsii affected the fertility and fecundity of S. frugiperda. For the other parameters, there is no significant difference when compared with the control. The results of this study suggest that the extracts obtained by decoction, aqueous and polypeptide of E. pulcherrima and R. simsii can be used to control S. frugiperda. However, the successful search, product starting from extracts of plants depends on the availability of plant and the entire assembly around the detection of bioactive products, in addition to the active ingredients of the chemical synthesis and elucidation of the target site insecticide molecule.

DACTYLOSTERNUM PUI (COLEOPTERA: HYDROPHILIDAE: SPHAERIDIINAE),A NEW SPECIES IN CHINA

Dactylosternum pui sp. nov. is described from Guangxi, China. It closely related to D. dohertyi Balfour\|Browne but differs from the latter by prosternum very strongly tectiform in middle and sharp carinate medially and with a distinct anteromedian tooth and different aedeagus. The new species can be separable from D. densepunctatum d′Orchymont by tectiform and carinate prosternum and with tooth anteromedially, median femora with dense and short pubescence.

M-PCR： a powerful method for rapid molecular identification of Trichogramma wasps （Hymenoptera： Trichogrammatidae）

Two species-specific primers were designed depending on ITS2 sequence variation of 37 Trichogramma wasps, and these primers were applied to establish an assay,multiplex PCR (M-PCR), for molecular diagnosis of two important Trichogramma wasps,T. confusum and T. dendrolimi, in China. Multiplex-PCR results showed that only target species produced two PCR products, one product of ITS2 region species-specific amplification and one product of its ITS 1 region universal amplification, but other species produced only one ITS1 universal PCR product. Using this method, the target Trichogramma species can be distinguished from other Trichogramma species. Molecular identification based on M-PCR has particular value over morphological technology and other approaches, such as normal molecular and biochemical methods. Furthermore, because M-PCR assay can avoid false negative results, which frequently happen in PCR reaction, this method will be much more accurate and useful for Trichogramma identification, and can be developed as an easy and rapid diagnostic kit applied in the identification and quality monitoring of Trichogramma mass products both in the factory and in the field. Such an easy and rapid diagnostic kit will be valuable in the application of Trichogramma species as a biological control.