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Development of a monitoring system for grain loss of paddy rice based on a decision tree algorithm

International journal of Agricultural and Biological Engineering 2021年第1期14卷 224-229页

作者： Yi lian jin Chen Zhuohuai Guan jie Song College of Mechanical Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina Synergistic Innovation Center of jiangsu Modern Agricultural Equipment and Technology Zhenjiang 212013JiangsuChina

China has the world’s largest planting area of paddy rice,but large quantities of paddy rice fall to the ground and are lost during harvesting with a combine *** grain loss is an effective way to increase production and *** this study,a monitoring system was developed to monitor the grain loss of the paddy rice and this approach was tested on the test bench for verifying the *** development of the monitoring system for grain loss included two stages:the first stage was to collect impact signals using a piezoelectric film,extract the four features of Root Mean Square,Peak number,Frequency and Amplitude(fundamental component),and identify the kernel impact signals using the j48(C4.5)Decision Tree *** the second stage,the precision of the monitoring system was tested for the paddy rice at three different moisture contents(10.4%,19.6%,and 30.4%)and five different grain/impurity ratios(1/0.5,1/1,1/1.5,1/2,and 1/2.5).According to the results,the highest monitoring accuracy was 99.3%(moisture content 30.8%and grain/impurity ratio 1/2.5),the average accuracy of the monitoring tests was 92.6%,and monitoring of grain/impurity ratios between 1/1 and 1/1.5(>95.4%)had higher accuracy than monitoring the other grain/impurity *** accuracy decreased as impurities *** lowest accuracy for grain loss monitoring was obtained when the grain/impurity ratio was 1/2.5,with monitoring accuracies of 88.2%,75.7%and 78.8%at moisture contents of 10.4%,19.6%and 30.4%.

关键词： monitoring system combine harvester paddy rice grain loss sensor data mining decision tree development

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中药复方对绵羊生长性能、血清生化指标、免疫和抗氧化功能的影响

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饲料研究 2024年第9期47卷 1-6页

作者：何振莲于天力任靖宇韩怡静裴彩霞山西农业大学动物科学学院山西晋中030801

试验旨在研究高精料饲粮中添加中药复方对绵羊生长性能、养分表观消化率、血清生化指标、免疫、抗炎和抗氧化功能的影响。选取30只体重(20.81±1.27)kg的3月龄杜寒杂交公羔,随机分为3组,每组10个重复,每个重复1只羊。基础饲粮精粗比为75... 详细信息

试验旨在研究高精料饲粮中添加中药复方对绵羊生长性能、养分表观消化率、血清生化指标、免疫、抗炎和抗氧化功能的影响。选取30只体重(20.81±1.27)kg的3月龄杜寒杂交公羔,随机分为3组,每组10个重复,每个重复1只羊。基础饲粮精粗比为75∶25,对照组、Z1组和Z3组的中药复方添加量分别为0、10、30 g/d。预试期15 d,正式试验期50 d。结果显示,与对照组相比,添加30 g/d中药复方可以提高绵羊的末重和平均日增重(P<0.05),降低料重比(P<0.05),提高粗蛋白表观消化率(P<0.05),降低血清尿素氮的含量(P<0.05),降低血清中甘油三酯含量(P<0.05),增加低密度脂蛋白胆固醇和高密度脂蛋白胆固醇含量(P<0.05),提高血清中总抗氧化能力以及过氧化氢酶、谷胱甘肽过氧化物酶和总超氧化物歧化酶的活性(P<0.05),降低血清中丙二醛含量(P<0.05),提高血清中酸性磷酸酶、溶菌酶活性以及免疫球蛋白、干扰素-γ含量(P<0.05),降低血清中一氧化氮、脂多糖、白细胞介素-1β、白细胞介素-6和肿瘤坏死因子-α含量(P<0.05)。研究表明,在高精料饲粮中添加30 g/d的中药复方可以提高绵羊的抗氧化能力和免疫功能,降低血清促炎因子水平,缓解机体炎症,提高绵羊的日增重和养分表观消化率,对保持绵羊机体健康具有积极影响。

关键词：高精料饲粮中草药添加剂绵羊生长性能免疫力抗氧化能力

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Turbulence and mixing in a freshwater-influenced tidal bay: Observations and numerical modeling

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Science China Earth Sciences 2015年第7期58卷 2049-2058页

作者： lian Qiang LIU ZhiYu Department of Physical Oceanography College of Ocean & Earth Sciences Xiamen University State Key Laboratory of Marine Environmental Science Xiamen University

In situ observations and numerical simulations of turbulence are essential to understanding vertical mixing processes and their dynamical controls on both physical and biogeochemical processes in coastal embayments. Using in situ data collected by bottom-mounted acoustic Doppler current profilers(ADCPs) and a free-falling microstructure profiler, as well as numerical simulations with a second-moment turbulence closure model, we studied turbulence and mixing in the Xiamen Bay, a freshwater-influenced tidal bay located at the west coast of the Taiwan Strait. Dynamically, the bay is driven predominantly by the M2 tide, and it is under a significant influence of the freshwater discharged from the jiulong River. It is found that turbulence quantities such as the production and dissipation rates of the turbulent kinetic energy(TKE) were all subject to significant tidal variations, with a pronounced ebb-flood asymmetry. Turbulence was stronger during flood than ebb. During the flooding period, the whole water column was nearly well mixed with the depth-averaged TKE production rate and vertical eddy viscosity being up to 5?10?6 W kg?1 and 2?10?2 m2 s?1, respectively. In contrast, during the ebb strong turbulence was confined only to a 5?8 m thick bottom boundary layer, where turbulence intensity generally decreases with distance from the seafloor. Diagnosis of the potential energy anomaly showed that the ebb-flood asymmetry in turbulent dissipation and mixing was due mainly to tidal straining process as a result of the interaction between vertically shared tidal currents and horizontal density gradients. The role of vertical mixing in generating the asymmetry was secondary. A direct comparison of the modeled and observed turbulence quantities confirmed the applicability of the second-moment turbulence closure scheme in modeling turbulent processes in this weakly stratified tidally energetic environment, but also pointed out the necessity of further refinements of the model.

关键词： tidal bay turbulent mixing second-moment turbulence closure model turbulent kinetic energy dissipation rate vertical eddy viscosity

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A chemical labeling of N^(6)-formyl adenosine(f^(6)A) RNA

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Chinese Chemical Letters 2022年第3期33卷 1563-1566页

作者： Li-jun Xie Cui-lian Lin Li Liu liang Cheng Beijing National Laboratory for Molecular Sciences(BNLMS) CAS Key Laboratory of Molecular Recognition and FunctionCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

N^(6)-methyl adenosine (m^(6)A) is an eminent epigenetic mark in mRNAs that affects a broad range of biological functions in diverse species. However, the chemically inert methyl group prevents a direct labeling of this modification for subsequent detection and sequencing. Therefore, most current approaches for the labeling of m^(6)A still have limitations of relying on the utilization of corresponding methyltransferases, which resulted in the lacking of efficiency. Here we present an approach which selectively alkylated the N^(6)-formyl adenosine (f^(6)A), the key intermediate during chemical oxidation of m^(6)A, with an alkyne functionality that can be further labeled with click reactions. This covalent labeling approach will be able to facilitate in the affinity purification, detection and genome-wide profiling studies.

关键词： RNA epigenetics Chemical modulation Labeling Nucleic acids Alkylation

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4种添加剂对饲料桑与脐橙渣混贮品质及微生物多样性的影响

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草业科学 2024年第7期41卷 1736-1746页

作者：吴丽娟欧翔连海邱静芸刘峥钟云平肖江平雷小文赣州市畜牧水产研究所江西赣州341000

为探讨复合菌制剂和复合酶制剂对饲料桑(Morus alba)与脐橙(Citrus sinensis)渣混合青贮品质及微生物多样性的影响,设置4个组,分别为对照组(CK,无添加)、复合菌制剂组[j组,添加0.1%植物乳杆菌(Lactobacillus plantarum)和0.05%枯草芽孢... 详细信息

为探讨复合菌制剂和复合酶制剂对饲料桑(Morus alba)与脐橙(Citrus sinensis)渣混合青贮品质及微生物多样性的影响,设置4个组,分别为对照组(CK,无添加)、复合菌制剂组[j组,添加0.1%植物乳杆菌(Lactobacillus plantarum)和0.05%枯草芽孢杆菌(Bacillus subtilis)]、复合酶制剂组(M组,添加0.01%纤维素酶和0.1%木聚糖酶)、复合菌酶制剂组(jM组,添加0.1%植物乳杆菌、0.05%枯草芽孢杆菌、0.01%纤维素酶和0.1%木聚糖酶),青贮发酵时间为60 d。结果表明:与CK组相比,j组和jM组的干物质含量和粗蛋白含量显著上升(Pj组、M组和jM组的中性洗涤纤维含量显著(PjM组的酸性洗涤纤维极显著下降(Pj组的酸性洗涤纤维含量无显著变化(P>0.05)。与CK组相比,j组、M组、jM组的pH均极显著降低(Pj组和jM组的氨态氮/总氮含量极显著下降(P0.05);j组、M组、jM组的乳酸含量极显著增加(PjM组的丙酸含量最低,且各组均未检测到丁酸。在门水平上,各组优势菌门为厚壁菌门,且相对丰度以jM组最高;其次为变形菌门,相对丰度以CK组最高。在属水平上,CK、M组优势菌属主要以乳杆菌属(Lactobacillus)、肠杆菌属(Enterobacter)和克雷伯氏菌属(Klebsiella)为主,而j、jM组优势菌属主要以乳杆菌属、芽孢杆菌属(Bacillus)和维斯氏菌属(Weissella)为主。综上所述,单独添加复合菌制剂或复合酶制剂均能不同程度地提升饲料桑与脐橙渣混贮的营养价值和发酵品质,还能改善其微生物菌群结构与组成,但联合添加复合菌制剂和复合酶制剂的青贮效果更佳。

关键词：饲料桑脐橙渣青贮品质营养价值微生物多样性复合菌制剂复合酶制剂

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合金元素对激光熔覆高熵合金涂层硬度影响的研究进展

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精密成形工程 2024年第5期16卷 201-224页

作者：林添祥冯美艳练国富陈昌荣兰如清福建理工大学机械与汽车工程学院福州350118

激光熔覆技术采用高能量密度的激光作为工艺的能量来源,能够对工件表面进行改性和修复,显著地改善了基体的表面力学性能,从而有效地延长了产品的生命周期。激光熔覆是制备高熵合金的典型工艺之一,采用该技术并且添加合适的合金元素可以... 详细信息

激光熔覆技术采用高能量密度的激光作为工艺的能量来源,能够对工件表面进行改性和修复,显著地改善了基体的表面力学性能,从而有效地延长了产品的生命周期。激光熔覆是制备高熵合金的典型工艺之一,采用该技术并且添加合适的合金元素可以制备具备卓越性能的高熵合金涂层。为清晰地阐明加入元素后增强激光熔覆高熵合金涂层硬度的作用机制,首先综述了目前国内外在激光熔覆过程中加入常见元素所制备的高熵合金涂层硬度性能的研究现状,其中高熵合金有特殊的“4种效应”,对金属间化合物有促进作用,其内部微观结构一般为FCC、BCC或者HCP等固溶相,通常通过固溶强化、沉淀强化和分散强化来强化,并且激光熔覆法会使高熵合金涂层快速冷却,从而显著改善合金的力学性能。其次,分析了金属与非金属两大类元素对激光熔覆制备高熵合金涂层硬度强化的机理,总结了金属元素与非金属元素的添加对高熵合金涂层硬度的影响规律。最后,针对激光熔覆制备高熵合金涂层硬度性能的改进,总结出了有效的方法,并对其未来发展进行了展望。研究结果揭示了激光熔覆高熵合金涂层硬度强化的理论基础,为该领域的进一步发展提供了理论依据。

关键词：激光熔覆高熵合金硬度影响机理金属元素非金属元素

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番鸭不同质地蛋壳超微结构及其与蛋壳强度的关联分析

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动物营养学报 2024年第2期36卷 1350-1360页

作者：梅慧灵郑定黔赵邦哲田若宁陈莹李昂连森阳梅景良吴旭福建农林大学动物科学学院(蜂学学院) 福州350002

本试验旨在研究番鸭正常蛋、沙壳蛋和条纹蛋等3种不同质地蛋壳在超微结构性状上的异同,并分析蛋壳超微结构性状与蛋壳强度之间的关联性。试验选用300日龄笼养白羽番鸭所产白色的正常蛋、沙壳蛋和条纹蛋厚度相近的蛋壳各12枚,分别作为3... 详细信息

本试验旨在研究番鸭正常蛋、沙壳蛋和条纹蛋等3种不同质地蛋壳在超微结构性状上的异同,并分析蛋壳超微结构性状与蛋壳强度之间的关联性。试验选用300日龄笼养白羽番鸭所产白色的正常蛋、沙壳蛋和条纹蛋厚度相近的蛋壳各12枚,分别作为3种不同质地蛋壳的试验组,每组设12个重复,每个重复1枚蛋壳。使用S3400N型扫描电镜观察蛋壳的超微结构,测定乳突层厚度和乳突间隙,计算有效厚度和平均乳突大小。结果表明:1)蛋壳强度在3种蛋之间差异显著(P沙壳蛋>条纹蛋;3种蛋间蛋形指数和钙化壳重差异均不显著(P>0.05)。2)在超微结构上,沙壳蛋和条纹蛋蛋壳的外表面皲裂较正常蛋蛋壳多而深,气孔较多,表观不平整;与正常蛋蛋壳相比,沙壳蛋蛋壳内表面纤维疏松凌乱,纤维间空隙较多,而条纹蛋蛋壳内表面纤维分布较沙壳蛋更为稀少,纤维间有明显间隙;沙壳蛋和条纹蛋蛋壳的横断面平整性和致密度都更差,乳突层与壳膜层联系也更加不紧密。在超微结构性状中,3种蛋壳间的钙化壳厚度和平均乳突大小差异不显著(P>0.05);沙壳蛋和条纹蛋蛋壳的乳突间隙均显著大于正常蛋蛋壳(P0.05);乳突层厚度在3种蛋壳之间均存在显著差异(P沙壳蛋>条纹蛋。3)3种蛋壳的乳突层厚度与蛋壳强度呈显著负相关(P0.05)。由此可见,厚度相似的番鸭正常蛋、沙壳蛋和条纹蛋蛋壳其蛋壳强度和超微结构均存在显著差异,其中乳突层厚度和乳突间隙与蛋壳强度均呈显著负相关,有效厚度与蛋壳强度呈显著正相关;在超微结构层面上,乳突层厚度、乳突间隙及有效厚度是影响蛋壳强度的主要因素。

关键词：番鸭正常蛋沙壳蛋条纹蛋超微结构蛋壳强度

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回火温度对5Cr5MoSiV1钢显微组织和性能的影响

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机械工程材料 2024年第5期48卷 15-19页

作者：郭志凯连明洋曹培泽王超锋原晓伟中铁工程装备集团有限公司郑州450016

对球化退火态5Cr5MoSiV1钢进行1050℃×1 h的淬火以及不同温度(515,530,560,590,620℃)保温1 h的回火处理,研究了回火温度对该钢显微组织、硬度、冲击韧性和耐磨性能的影响。结果表明:不同温度回火后5Cr5MoSiV1钢的组织均为回火索氏体... 详细信息

对球化退火态5Cr5MoSiV1钢进行1050℃×1 h的淬火以及不同温度(515,530,560,590,620℃)保温1 h的回火处理,研究了回火温度对该钢显微组织、硬度、冲击韧性和耐磨性能的影响。结果表明:不同温度回火后5Cr5MoSiV1钢的组织均为回火索氏体和少量碳化物,随着回火温度升高,碳化物增多并发生聚集长大,当回火温度超过560℃时,基体回复和再结晶加剧,马氏体板条状特征逐渐模糊;随着回火温度的升高,5Cr5MoSiV1钢的硬度降低,冲击吸收能量先基本不变后升高,磨损质量损失呈先波动下降后升高的趋势。5Cr5MoSiV1钢合适的回火温度为590℃,此时该钢兼具良好的冲击韧性和耐磨性能,硬度为51.1 HRC,冲击吸收能量为25.7 j,磨损质量损失为3.864 g。

关键词： 5Cr5MoSiV1钢回火温度显微组织冲击韧性耐磨性能

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Realizing Intelligent Spectrum Management for Integrated Satellite and Terrestrial Networks

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journal of Communications and Information Networks 2021年第1期6卷 32-43页

作者： Ying-Chang liang junjie Tan Haonan jia jintao Zhang lian Zhao Center for Intelligent Networking and Communications University of Electronic Science and Technology of ChinaChengdu 611731China National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of ChinaChengdu 611731China Department of Electrical Computerand Biomedical EngineeringRyerson UniversityToronto M2J4A6ONCanada

Nowadays both satellite and terrestrial networks are expanding rapidly to meet the ever-increasing demands for higher throughput,lower latency,and wider ***,spectrum scarcity places obstacles in the sustainable *** accommodate the expanding network within a limited spectrum,spectrum sharing is deemed as a promising ***,cognitive radio(CR)has been proposed in the literature to allow satellite and terrestrial networks to share their spectrum ***,the existing CR-based schemes are found to be impractical and inefficient because they neglect the difficulty in obtaining the accurate and timely environment perception in satellite communications and only focus on link-level coexistence with limited *** this paper,we propose an intelligent spectrum management framework based on software defined network(SDN)and artificial intelligence(AI).Specifically,SDN transforms the heterogenous satellite and terrestrial networks into an integrated satellite and terrestrial network(ISTN)with reconfigurability and *** is further used to make predictive environment perception and to configure the network for optimal resource ***,the proposed framework provides a new paradigm to integrate and exploit the spectrum of satellite and terrestrial networks.

关键词： cognitive radio(CR) spectrum management satellite communications integrated satellite and terrestrial networks(ISTN)

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Developing a new model system for potato genetics by androgenesis

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journal of Integrative Plant Biology 2021年第4期63卷 628-633页

作者： Miru Du Ting Wang Qun lian Xiaojie Zhang Guohui Xin Yuanyuan Pu Glenn jBryan jianjian Qi Inner Mongolia Potato Engineering and Technology Research Center Inner Mongolia UniversityHohhot 010021China Shenzhen Branch Guangdong Laboratory for Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of AgricultureAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518000China Cell and Molecular Sciences The James Hutton InstituteInvergowrieDundee DD25DAUK

High heterozygosity and tetrasomic inheritance complicate studies of asexually propagated polyploids,such as *** genetics approaches,especially mutant library construction,can be an ideal choice if a proper mutagenesis genotype is ***,we aimed to generate a model system for potato research using anther cultures of Solanum verrucosum,a self-compatible diploid potato with strong late blight *** of the 23 regenerants obtained(SVA4,SVA7,SVA22,SVA23,SVA32,and SVA33)were diploids,and their homozygosity was estimated to be>99.99%with 22 polymorphic In Del *** lines-SVA4 and SVA32-had reduced stature(plant height≤80 cm),high seed yield(>1,000 seeds/plant),and good tuber set(>30 tubers/plant).We further confirmed the full homozygosity of SVA4 and SVA32 using wholegenome *** two regenerants possess all the characteristics of a model plant:diploidy,100%homozygosity,self-compatibility,and amenability to ***,we have successfully generated two lines,SVA4 and SVA32,which can potentially be used for mutagenesis and as model plants to rejuvenate current methods of conducting potato research.

关键词： diploid potato homozygous model system self-compatible Solanum verrucosum

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