检索结果-南通市图书馆

Construction of Repeated-Root Constacyclic Code of Length 8p^s over f_(p^m)

在线全文

学校读者我要写书评

暂无评论

wuhan University Journal of Natural Sciences 2015年第1期20卷 1-7页

作者： ZHANG Xiaoyan mao Qili School of Mathematics and Physics Hubei Polytechnic University

for any odd prime p, a classification of all cyclic and negacyclic codes of length 8ps over fpm are obtained, which establishes the algebra structures in term of specified polynomial generators of such codes. Among other results, all self-dual negacyclic codes of length 8ps are obtained, and the structures of α-constacyclic and β-constacyclic codes of length 8ps over fpm are established.

关键词： quad cyclic codes negacyclic codes constacyclie codes dual codes repeated-root codes

菌酶复合制剂对湖羊生长性能、血清指标和粪便微生物的影响

在线全文

学校读者我要写书评

暂无评论

农业生物技术学报 2025年第1期33卷 134-145页

作者：祁帅仓振牛伟强李鹏张积鑫茆达干南京农业大学动物科技学院启东瑞鹏牧业有限公司

肉羊(Ovis aries)高度集约化养殖易导致氧化应激，机体抵抗力下降，胃肠菌群紊乱，影响生长性能。饲粮中添加菌酶复合制剂可改善肠道菌群结构，提高营养物质消化率和动物生长性能。为了探究菌酶复合制剂对湖羊生长性能、血清指标和粪便... 详细信息

肉羊(Ovis aries)高度集约化养殖易导致氧化应激，机体抵抗力下降，胃肠菌群紊乱，影响生长性能。饲粮中添加菌酶复合制剂可改善肠道菌群结构，提高营养物质消化率和动物生长性能。为了探究菌酶复合制剂对湖羊生长性能、血清指标和粪便微生物的影响，将48只2月龄的健康湖羊公羔((18.00±2.00) kg)随机分为4组，对照组饲喂基础日粮，实验组1、2、3分别添加0.1%、0.2%、0.3%菌酶复合制剂，预饲期7 d，正式期60 d。结果表明，与对照组相比，在31～60 d和1～60 d实验1和2组平均日增重(average daily gain, ADG)显著提高(Pfeed to gain ratio, f/G)均显著下降(Pfibre, NDf)和酸性洗涤纤维(acid detergent fibre, ADf)表观消化率显著升高(P<0.05)；在门水平上，疣微菌门(Verrucomicrobiota)丰度显著提高(P<0.05)，蓝藻菌门(Cyanobacteria)和弯曲杆菌门(Campylobacterota)丰度显著降低(P<0.05)；在属水平上，另枝菌属(Alistipes)和普雷沃氏菌科UCG-001(Prevotellaceae＿UCG-001)丰度显著提高(P<0.05)，念珠菌＿糖单胞菌属(Candidatus＿Saccharimonas)丰度显著降低(P<0.05)。综上，菌酶复合制剂可提高湖羊生长性能、抗氧化和免疫能力，提高养分表观消化率，促进肠道有益菌的定植，抑制有害菌的定植，以0.2%添加量为最佳。本研究为菌酶复合制剂在湖羊生产中的应用提供科学依据。

关键词：湖羊生长性能菌酶复合制剂粪便微生物

few-shot Learning for Named Entity Recognition Based on BERT and Two-level Model fusion

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Data Intelligence 2021年第4期3卷 568-577页

作者： Yuan Gong Lu mao Changliang Li AI Lab King Soft CorporationBeijing 100086China

Currently,as a basic task of military document information extraction,Named Entity Recognition(NER)for military documents has received great *** 2020,China Conference on Knowledge Graph and Semantic Computing(CCKS)and System Engineering Research Institute of Academy of Military Sciences(AMS)issued the NER task for test evaluation,which requires the recognition of four types of entities including Test Elements(TE),Performance Indicators(PI),System Components(SC)and Task Scenarios(TS).Due to the particularity and confidentiality of the military field,only 400 items of annotated data are provided by the *** this paper,the task is regarded as a few-shot learning problem for NER,and a method based on BERT and two-level model fusion is ***,the proposed method is based on several basic models fine tuned by BERT on the training ***,a two-level fusion strategy applied to the prediction results of multiple basic models is proposed to alleviate the over-fitting ***,the labeling errors are eliminated by *** method achieves f1 score of 0.7203 on the test set of the evaluation task.

关键词： few-shot learning Named entity recognition BERT Two-level model fusion

The Development of a Two-finger Dexterous Bionic Hand with Three Grasping Patterns-NwAfU Hand

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2020年第4期17卷 718-731页

作者： Zhiguo Li Zhongliang Hou Yuxiao mao Yan Shang Lukasz Kuta College of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100China Key Laboratory of Agricultural Internet of Things Ministry of Agriculture and Rural AffairsYangling 712100China Institute of Environmental Protection and Development Wroclaw University of Environmental and Life SciencesWroclaw 50-375Poland

Bionic inspiration from human thumb and index finger was the drive to design a high-performance two-finger dexterous *** size of each phalanx and the motion range of each joint in the human thumb and index finger were summarized,and the features of three grasping patterns were described in ***,a two-finger dexterous bionic hand with 6 Degrees of freedom(Dofs)was *** the mechanical thumb and index finger were made up of three rigid phalanx links and three mechanical rotation *** grasp-release tests validated that the bionic hand can perform three grasping patterns:power grasp,precision pinch and lateral *** grasping success rates were high under the following cases:(1)when power grasping was used to grasp a ring with external diameter 20 mm-140 mm,a cylinder with masswith cylinder,sphere or ellipsoid shape;(2)when the precision pinch was used to grasp thin or small objects;(3)when the lateral pinch was used to grasp low length-to-width ratio of *** work provided a method for developing two-fimger bionic hand with three grasping patterns,and further revealed the linkage between the difference in fimger structure and size and the hand manipulation dexterity.

关键词： dexterous bionic hand mechanical finger power grasp precision pinch lateral pinch

The exact Hausdorff measures for the graph and image of a multidimensional iterated Brownian motion

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Mathematics 2007年第1期50卷 35-46页

作者： Rong-mao ZHANG Zheng-yan LIN Department of Mathematics Zhejiang UniversityHangzhou 310027China

Let {w (t), t ∈ R}, {B(t), t ∈ R +} be two independent Brownian motions on R with w(0) = B(0) = 0. In this paper, we shall consider the exact Hausdorff measures for the image and graph sets of the d-dimensional iterated Brownian motion X(t), where X(t) = (X 1(t),…, X d (t)) and X 1(t),…, X d (t) are d independent copies of Y(t) = w(B(t)). In particular, for any Borel set Q ? (0, ∞), the exact Hausdorff measures of the image X(Q) = {X(t): t ∈ Q} and the graph GrX(Q) = {(t, X(t)): t ∈ Q} are established.

关键词： graph Hausdorff measure image iterated Brownian motion sojourn time 60f15 60G15 60G17

Assessment of Photochemical Reflectance Index as a Tool for Evaluation of Chlorophyll fluorescence Parameters in Cotton and Peanut Cultivars Under water Stress Condition

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2010年第5期9卷 662-670页

作者： Shahenshah Yasuda Yoshizumi LI mao-song Isoda Akihiro Graduate School of Horticulture Chiba University Chiba 271-8510 Japan Graduate School oflnformatics Tokyo University of Information Sciences Chiba 265-8501 Japan Institute of Environment and Sustainable Development for Agriculture Chinese Academy of Agricultural Sciences Beijing 100081 P.R. China

The relationships between photochemical reflectance index （PRI） and the chlorophyll fluorescence parameters were examined to assess suitability of PRI as a remote-sensing tool for the chlorophyll fluorescence parameters. A greenhouse experiment was conducted using cotton and peanut crops under water stress condition. five cotton and six peanut cultivars were grown using Andosole soil in pots maintained at two water levels; the control and water stress treatment （wS） of 100 and 50% of the daily transpiration, respectively. Higher non-photochemical quenching （NPQ） was exhibited by peanut than that of cotton by the water stress. On the other hand, the decreases of the actual quantum yield of photosystem II （△f/f＇m） and PRI by the water stress in cotton were larger than those in peanut. There were positively significant correlation coefficients between PRI and △f/f＇m in cotton at noon and in the afternoon including the control and wS. The correlations of PRI with NPQ were negatively significant at noon and in the afternoon for cotton, and in the afternoon for peanut. No clear relationship was found among these parameters in the morning probably due to the diurnal increase in global solar radiation. It was concluded that there would be a possibility to detect the effects of water stress on △f/f＇m and NPQ by PRI with some exceptions, although PRI could not note varietals differences in △f/f＇m and NPQ for each treatment.

关键词： actual quantum yield of photosystem II Arachis hypogaea L. Gossypium hirsutum L. non-photochemicalquenching photochemical reflectance index remote sensing water stress

Performances of conventional fusion methods evaluated for inland water body observation using Gf-1 image

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2019年第1期38卷 172-179页

作者： Yong Du Xiaoyu Zhang Zhihua mao Jianyu Chen School of Earth Sciences Zhejiang University School of Biology and the Environment Jiyang College of Zhejiang A&F University State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography Ministry of Natural Resources

Satellite remote sensing of inland water body requires a high spatial resolution and a multiband narrow spectral resolution, which makes the fusion between panchromatic(PAN) and multi-spectral(MS) images particularly important. Taking the Daquekou section of the Qiantang River as an observation target, four conventional fusion methods widely accepted in satellite image processing, including pan sharpening(PS), principal component analysis(PCA), Gram-Schmidt(GS), and wavelet fusion(wf), are utilized to fuse MS and PAN images of *** results of subjective and objective evaluation methods application indicate that GS performs the best,followed by the PCA, the wf and the PS in the order of descending. The existence of a large area of the water body is a dominant factor impacting the fusion performance. Meanwhile, the ability of retaining spatial and spectral informations is an important factor affecting the fusion performance of different fusion methods. The fundamental difference of reflectivity information acquisition between water and land is the reason for the failure of conventional fusion methods for land observation such as the PS to be used in the presence of the large water body. It is suggested that the adoption of the conventional fusion methods in the observing water body as the main target should be taken with caution. The performances of the fusion methods need re-assessment when the large-scale water body is present in the remote sensing image or when the research aims for the water body observation.

关键词： Gf-1 satellite image fusion methods fusion evaluation inland water body

Priority-Based Real-Time Stream Coding over Multi-Channel with Packet Erasures

在线全文

学校读者我要写书评

暂无评论

China Communications 2017年第1期14卷 72-85页

作者： Yunkai wei Qianyu Liu Zhoucha Hu Yuming mao School of Communication and Information Engineering University of Electronic Science and Technology of ChinaChengduSichuan611731China

Multi-channel can be used to provide higher transmission ability to the bandwidth-intensive and delay-sensitive real-time streams. However, traditional channel capacity theories and coding schemes are seldom designed for the real-time streams with strict delay constraint, especially in multi-channel context. This paper considers a real-time stream system, where real-time messages with different importance should be transmitted through several packet erasure channels, and be decoded by the receiver within a fixed delay. Based on window erasure channels and i.i.d.(identically and independently distributed) erasure channels, we derive the Multi-channel Real-time Stream Transmission(MRST) capacity models for Symmetric Real-time(SR) streams and Asymmetric Real-time(AR) streams respectively. Moreover, for window erasures, a Maximum Equilibrium Intra-session Code(MEIC) is presented for SR and AR streams, and is shown able to asymptotically achieve the theoretical MRST capacity. for i.i.d. erasures, we propose an Adaptive Maximum Equilibrium Intra-session Code(AMEIC), and then prove AMEIC can closely approach the MRST transmission capacity. finally, the performances of the proposed codes are verified by simulations.

关键词： real-time stream multi-channel channel coding erasure model transmission capacity

Evaluation of Population Structure, Genetic Diversity and Origin of Northeast Asia weedy Rice Based on Simple Sequence Repeat Markers

在线全文

学校读者我要写书评

暂无评论

Rice science 2015年第4期22卷 180-188页

作者： LI mao-bai wANG Hui CAO Li-ming Shanghai Academy of Agricultural Sciences Seed Management Station of Shanghai

weedy rice exerts a severe impact on rice production by competing for sunlight, water and nutrients. This study assayed the population structure, genetic diversity and origin of Northeast Asia weedy rice by using 48 simple sequence repeat markers. The results showed that weedy rice in Northeast Asia had a high genetic diversity, with Shannon＇s diversity index （I） of 0.748 and the heterozygosity （He） of 0.434. In each regional population, I value varied widely. The widest range of I （0.228-0.489） was observed in the weedy rice of Eastern China, which was larger than that of Northeast China and Korea （0.168-0.270）. The f-statistics of regional populations （fis, fit and fst） also showed higher values in the weedy rice of Eastern China than those of Northeast China and Korea All weedy rice accessions were grouped into two clusters in the unweighted pair group method with arithmetic mean cluster analysis dendrogram, namely Eastern China branch and Northeastern China plus Korea branch. There was significant differentiation in genetic characteristics in weedy rice of northeastern and eastern Asia, especially in Eastern China.

关键词： weedy rice simple sequence repeat genetic diversity population structure weed control