dataset

 Rice disease can significantly reduce yields, so monitoring and identifying the diseases during the growing season is crucial. Some of the current studies are based on images with simple backgrounds, and the realistic field-settings are full of background noise, making this task challenging. Traditional artificial prevention and control methods are not only heavy workload, low efficiency, but also haphazard, unable to achieve real-time monitoring, which seriously limited the development of modern agriculture. Therefore, using target detection algorithm to identify rice diseases is an important research direction in the agricultural field. In this paper, the pictures of rice diseases taken in Jinzhai County, Lu 'an City, Anhui Province were taken as the research object, including rice leaf blast, bacterial blight and flax leaf spot, with a total of 7220 pictures. We propose a rice disease identification method based on the improved YOLOV5s, which reduces the computation of the backbone network, reduces the weight file of the model to 3.2MB, which is about 1/4 of the original model, and accelerates the prediction speed by 3 times. Compared with other mainstream methods, our method achieves the best performance with low computational cost. It solves the problem of slow recognition speed due to the large weight file and calculation amount of model when the model is deployed in mobile terminal </p

The Traditional Sports Culture and its Characteristics of Yao Nationality

文章以文献资料法、观察法对瑶族传统体育活动进行了描述和分析,认为瑶族传统体育内容丰富,形式多样,个性鲜明.具有融合性、宗教性、生产生活性、娱乐性等特征;具有凝聚民族精神、传承民族文化、规范社会伦理、强身健体、娱乐身心等社会价值。The traditional sports culture of Yao nationality has been described and analyzed through lit- erature consultation and observation method, the thesis holds that it involves rich contents, various forms and distinctive characters, with the characteristics of amalgamation, religiousness, entertainment, production and life practice etc.. It has such social values as concentrating the ethnic spirit, inheriting ethnic cultures, regulating social ethics, improving the health and entertaining the body and mind.广西民族大学学科建设资助项目“瑶族传统体育文化研究

关于超级计算发展战略方向的思考

超级计算能力是国家科技竞争力乃至综合国力的重要标志,也是经济社会发展、国防和国家安全的重要支撑。特别是在网络化、大数据、云计算和虚拟现实迅猛发展的背景下,超级计算不但是科技发展的利器,正引发科研模式的根本变革,也将成为重要的社会基础设施,并最终深刻地改变我们的生产和生活方式。但目前超级计算正面临应用效率低、能耗高、稳定性差和难以应用等严峻挑战。基于在复杂系统多尺度模拟方面多年的探索和积累,文章提出,按照计算对象、模型、软件与硬件的逻辑和结构一致的原理优化计算机体系结构,缓解和克服商品化通用硬件系统开发中的难点,可能是突破这些瓶颈的一条具有普遍意义的途径。</p

甘肃临潭陈旗磨沟遗址人牙结石中淀粉粒反映的古人类植物性食物

甘肃临潭齐家文化陈旗磨沟遗址是一处4000a BP的墓葬群,规模较大.由于其独特的埋葬制度及丰富的具有代表性的器物类型而被评为2008年"中国十大考古发现".我们从墓葬编号M187和M194中获得了两个成人个体的3颗牙齿,在不破坏牙齿的情况下,采取多种方法对该遗址中古人类牙结石里的淀粉粒进行了提取和鉴定.研究结果表明当时人类植物性食物具有多样化特征.牙结石中包括了来自小麦属小麦(Triticum aestivum)、大麦属大麦(Hordeum vulgare)和青稞(Hordeum vulgare var.nudum)等中的一种或者多种、狗尾草属粟(Setaria italica)、荞麦属荞麦(Fagopyrum esculentum)、豆类及坚果类等植物的淀粉粒.其中麦类植物、荞麦和粟的淀粉粒数量占到了淀粉粒总量的70%,可能为当时人类的主要植食来源;坚果类、豆类植物也是当时人类的主要食物之一.大量麦类植物淀粉粒的出现,为研究麦作农业在中国的传播路线提供了证据,而且从恢复的农作物种类来看,当时农业具有多样性特征.坚果类栎属(Quercus)、疑似银杏(Ginkgo biloba)淀粉粒的出现,说明采集仍是农业的补充方式之一.陈旗磨沟遗址古人牙结石中的淀粉粒组合,反映了在距今4000年前,甘肃临潭一带的齐家文化社会以多样性旱作农业为获取食物的主要方式,但仍存在采集经济

Prerapation and Supercapacitor Property of Al Doped Co_3O_4

以KOH作沉淀剂制备掺杂Al(Ⅲ)的Co3O4粉体.X射线衍射显示,掺Al的Co3O4不改变其晶型结构.循环伏安、恒流充放电等测试表明,化学掺Al后的Co3O4电极,其比容量提高,当Co(Ⅱ)与Al(Ⅲ)的摩尔比为1∶0.05时,在0~400 mV的电位区间内,5 mA/cm2电流密度下,单电极放电比容量可达518.07 F/g.With KOH as precipitator to prepare Aluminum doped Co3O4,X-ray diffraction indicated that the doping Al did not change the crystal structure of Co3O4.Electrochemical properties of the sample were tested by cyclic voltammetry and constant-current charge/discharge.The results showed that the chemical doping improved the specific capacitance.When the mol ratio of Co(Ⅱ) with Al(Ⅲ)was 1∶0.05,the specific capacitance was up to 518.07 F/g within 0～400 mV potenitial at current density 5 mA/cm2.作者联系地址：哈尔滨工程大学材料科学与化学工程学院,哈尔滨工程大学材料科学与化学工程学院,哈尔滨工程大学材料科学与化学工程学院,哈尔滨工程大学材料科学与化学工程学院 黑龙江哈尔滨150001,黑龙江哈尔滨150001,黑龙江哈尔滨150001,黑龙江哈尔滨150001Author's Address: College of Material science and Chemical Engineering,Harbin Engineering University,Harbin 150001,Heilongjiang,Chin

In-situ polymerization organic-inorganic hybrid materials monomer casting polyamide 6/ nanorods yttrium hydroxide

Single crystalline Y(OH)3 nanorods were synthesized from Y2O3 powder by a simple hydrothermal synthesis method under alkaline conditions. SEM images displayed that the nanorods have average diameters of about 400nm and lengths up to several micrometers. In this paper, it is used nano-inorganic particles yttrium hydroxide to modified MC nylon. The different mass fraction of yttrium hydroxide has affected mechanical and thermal properties of the MC nylon composites. The results show that with increasing of the mass fraction of yttrium hydroxide, the impact strength is the highest value when yttrium hydroxide mass fraction of 0.25wt%, however the tensile strength decrease 20%. And there is a little change in thermal stability when Yttrium Hydroxide added. &copy; (2013) Trans Tech Publications, Switzerland