检索结果-南通市图书馆

融合知识图谱和大模型的高校科研管理问答系统设计

在线全文

学校读者我要写书评

暂无评论

计算机科学与探索 2025年第1期19卷 107-117页

作者：王永秦嘉俊黄有锐邓江洲重庆邮电大学电子商务与现代物流重点实验室重庆400065

科研管理是高校管理中的重要组成部分,但现有的科研管理系统难以满足用户的个性化需求。以高校科研管理向智能化转型为需求导向,将知识图谱、传统模型和大语言模型相结合,共同构建新一代高校科研管理问答系统。采集科研知识用于构建科... 详细信息

科研管理是高校管理中的重要组成部分,但现有的科研管理系统难以满足用户的个性化需求。以高校科研管理向智能化转型为需求导向,将知识图谱、传统模型和大语言模型相结合,共同构建新一代高校科研管理问答系统。采集科研知识用于构建科研知识图谱。利用同时进行意图分类和实体提取的多任务模型进行语义解析。借助解析结果来生成查询语句,并从知识图谱中检索信息来回复常规问题。将大语言模型与知识图谱相结合,以辅助处理开放性问题。在意图和实体具有关联的数据集上的实验结果表明,采用的多任务模型在意图分类和实体识别任务上的F1值分别为0.958和0.937,优于其他对比模型和单任务模型。Cypher生成测试表明了自定义Prompt在激发大语言模型涌现能力方面的成效,利用大语言模型实现文本生成Cypher的准确率达到85.8%,有效处理了基于知识图谱的开放性问题。采用知识图谱、传统模型和大语言模型搭建的问答系统的准确性为0.935,很好地满足了智能问答的需求。

关键词：知识图谱多任务模型意图分类命名实体识别大语言模型

SAGE based iterative receiver for joint synchronization and channel estimation in uplink MIMO-OFDMA systems

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2008年第3期15卷 100-104页

作者： JIANG Zheng qin Xiao-fang ZHANG Xin chang yong-yu Wireless Theories and Technologies Laboratory Beijing University of Posts and Telecommunications Beijing 100876 China

A new Turbo iterative receiver structure is proposed for the uplink multiple-input multiple-output orthogonal frequency division multiple access （MIMO-OFDMA） systems. The space-alternating generalized expectation-maximization （SAGE） algorithm is naturally embedded in the framework of iterative receiver to perform synchronization and detection usin~ the Turbo detector outputs. In each iteration, the expectation step intends to remove the multiple access interference （MAI） caused by other asynchronous users, and the maximization step is utilized to estimate the required parameters （i.e., timing offset, carrier frequency offset, channel state information, etc.） sequentially for each user. Simulation results show that the proposed algorithm can approach the performance of ideal receiver closely, while the processing complexity is rather lower than the conventional detectors.

关键词： SAGE iterative receiver synchronization channel estimation

Influence of crucible material on inclusions in 95Cr saw-wire steel deoxidized by Si–Mn

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2020年第8期27卷 1083-1099页

作者： Yang Li chang-yong Chen Guo-qing qin Zhou-hua Jiang Meng Sun Kui Chen School of Metallurgy Northeasten UniversityShenyang 110819China

To investigate the interaction mechanism between 95 Cr saw-wire steel and different refractories,we conducted laboratory experiments at 1873 *** crucible materials(SiO2,Al2 O3,MgO·Al2 O3,MgO,and MgO-CaO)were *** results indicate that SiO2,Al2 O3,and MgO·Al2 O3 are not suitable for smelting low-oxygen,low-[Al]s 95 Cr saw-wire steel,mainly because they react with the elements in the molten steel and pollute the steel *** contrast,MgO-CaO is an ideal choice to produce 95 Cr saw-wire *** offers three advantages:(ⅰ)It does not decompose by itself at the steelmaking temperature of 1873 K because it exhibits good thermal stability;(ⅱ)[C],[Si],and[Mn]in molten steel cannot react with it to increase the[O]content;and(ⅲ)it not only desulfurizes and dephosphorizes but also removes Al2 O3 inclusions from the steel *** a result,the contents of the main elements([C],[Si],[Mn],[Cr],N,T.O(total oxygen))in the steel are not affected and the content of impurity elements([Al]s,P,and S)can be perfectly controlled within the target ***,the number and size of inclusions in the steel samples decrease sharply when the MgO-CaO crucible is used.

关键词： nonmetallic inclusions 95Cr saw-wire steel crucible material MgO–CaO refractory

Natural Hybridization between Rhododendron delavayi and ***(Ericaceae),from Morphological,Molecular and Reproductive Evidence

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2010年第9期52卷 844-851页

作者： yong-Peng Ma chang-qin Zhang Jing-Li Zhang Jun-Bo Yang Kunming Botanic Garden Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China Key Laboratory of Resource Plants and Biotechnology Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China Graduate University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100049 China Tunnan Agricultural University Kunming 650201 China Key Laboratory of Biodiversity and Biogeography Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China

The natural hybridization that occurs between two sympatric species of Rhododendron subgenus Hymenanthes in Yunnan, China, was investigated. In field observations, it was noted that the putative hybrids between R. delavayi Franch. and R. cyanocarpum （Franch.） Franch. ex W.W. Sm. had intermediate morphologies. On the basis of morphology, chloroplast DNA （trnL-rp132） and nuclear DNA （waxy）, hybrids and parental species were identified. Hybridization occurred in both directions, but was asymmetrical, with R. delavayi as the major maternal parent. Reciprocal hand pollination treatments showed that either species, as pollen donor or pollen receiver, could produce fruits. It was noted that fruit set varied among treatments. The same pollinators （bumblebees） were shared in both parental species. From these results, we conclude that individuals with intermediate morphologies are indeed of hybrid origin from natural hybridization between R. cyanocarpum and R. delavayi. Furthermore, we presume the hybridization at the study site could have been initiated by habitat disturbance in the 1950s, and we may hence witness the early stages of hybrid swarm formation.

关键词： Natural hybridization Hybridization Hybrids Species Fruits DNA Fruit Swarming Pollen Pollinators

Quantifying the Mechanical Properties of White Sandstone Based on Computer Fractal Theory

在线全文

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2021年第10期39卷 121-131页

作者： yong Wang yongyan Wang Nan qin Sa Huang Le chang Shunzheng Hou School of Mechanical and Electrical Engineering Qingdao University of Science and TechnologyQingdao266061China

The work presented in this paper was conducted to quantify the relationship between the pore characteristics and mechanical properties of white *** study include tests carried out under the coupling effects of chemical corrosion,temperature,nuclear magnetic resonance,and mechanical *** fractal theory was employed to describe and quantify the characteristics of the growth of pores in white sandstone under the same coupling effect.A custom developed program code,in the MATLAB software platform,was used for calculating the growths of the pores in white sandstone when subjected to coupling *** correlation between the computer fractal dimension of the growth of the pores in rock and characteristics of mechanical damage was accordingly *** results showed that when the temperature was set at a level lower than 100°C,it caused damage to the rock and strength reduction,primarily due to the rates of chemical reactions,the generation,and evolution of pores in the rock mass under the coupling effects of chemical corrosion and ***,it was observed that the higher the value of the computer fractal dimension,the higher the growth of the pores,and the lower the uniaxial compressive strength of the white sandstone.

关键词： White sandstone pore characteristics mechanical properties MATLAB chemical corrosion temperature fractal dimension nuclear magnetic resonance

Study on performance degradation and failure analysis of machine gun barrel

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

Defence Technology（防务技术） 2020年第2期16卷 362-373页

作者： Xiaolong Li Lei Mu yong Zang qin qin School of Mechanical Engineering University of Science and Technology BeijingBeijing100083China

An increase in the use of the gun barrel will cause wear of the inner wall,which reduces the muzzle velocity and the spin rate of the *** off-bore flight attitude and trajectory of the projectile also change,affecting the shooting power and the *** ballistic data of a high-speed spinning projectile are required to study the performance ***,based on the barrel’s accelerated life test,the whole process of projectile shooting is reproduced using numerical simulation technology,and key information on the ballistic performance change at each shooting stage are *** have shown that in the later stages of barrel shooting,the accuracy of shooting has not decreased ***,it is found that the angle of attack of the projectile increases as the wear of the barrel *** maximum angle of attack reaches 0.106 rad when the number of shots reaches ***,elliptical bullet hole has appeared on the target at this shooting *** combining external ballistic theory with simulation results,the primary reason of this phenomenon is found to be a significant decrease in the muzzle spin rate of the *** the end of the barrel life,the projectile muzzle spin rate is 57.5%lower than that of a barrel without wear.

关键词： Wear of the inner wall Accelerated life test Numerical simulation Ballistic performance End of the barrel life

在线全文

学校读者我要写书评

暂无评论

转人源免疫球蛋白猪胚胎的研究进展

现代生物医学进展 2009年第24期9卷 4789-4791页

作者：覃永长潘斌蒋钦扬张家庆吴正三郭亚芬蒋和生广西大学动物科技学院动物遗传育种实验室广西大学动物繁殖研究所广西南宁530004

转基因猪能够为人类提供可移植的异种器官,从而缓解临床医学应用上供体移植器官短缺的压力。本文综述了异种器官移植后发生免疫排斥的研究进展,讨论了应用原核显微注射法和精子载体法生产转人源免疫球蛋白基因(DAF、MCP、CD59)巴马香猪... 详细信息

转基因猪能够为人类提供可移植的异种器官,从而缓解临床医学应用上供体移植器官短缺的压力。本文综述了异种器官移植后发生免疫排斥的研究进展,讨论了应用原核显微注射法和精子载体法生产转人源免疫球蛋白基因(DAF、MCP、CD59)巴马香猪胚胎的方法,力争为解决异种移植的技术"瓶颈"提供技术支撑,为后续的异种器官移植做初步的研究。

关键词：异种器官移植人源免疫球蛋白转基因胚胎

Mechanism of CO_2 enhanced CBM recovery in China: a review

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2008年第3期18卷 406-412页

作者： qin yong School of Mineral Resources and Geoscience China University of Mining ＆ Technology Xuzhou Jiangsu 221116 China

Permeability of coal reservoirs in China is in general low. Injection of CO2 into coal seams is one of the potential ap-proaches for enhancing coalbed methane (CBM) production. The feasibility of this technology has been investigated in China since the 1990s. Advances in mechanism of CO2 enhanced CBM recovery (CO2-ECBM) in China are reviewed in light of certain aspects, such as the competitive multi-component gas adsorption, sorption-induced coal swelling/shrinkage and its potential effect on CBM production and numerical simulation for CO2-ECBM recovery. Newer investigations for improving the technology are discussed. It is suggested that a comprehensive feasibility demonstration in terms of geology, technology, economics and environment-carrying capacity is necessary for a successful application of the technology for CBM recovery in China. The demonstration should be car-ried out after more investigations into such facets as the control of coal components and structure to a competitive multi-component-gas adsorption, the behavior and essence of super-critical adsorption by coal of gas, environmental and safe feasi-bility of coal mining after CO2 injection and more extensive pilot tests for CO2-ECBM recovery.

关键词： coatbed methane CO2 injection enhanced recovery mechanism feasibility

Assessments on surface water resources and their vulnerability and adaptability in China

在线全文

学校读者我要写书评

暂无评论

Advances in Climate change Research 2020年第4期11卷 381-391页

作者： qin Jia DING yong-Jian ZHAO Qiu-Dong WANG Shao-Ping chang Ya-Ping State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China Key Laboratory of Eco-Hydrology Inland River Basin Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China University of Chinese Academy of Sciences Beijing100049China

A clear understanding of the changes of water resources under the background of environmental changes is of great significance for scientific management and utilization of water resources in *** study systematically analyzed the spatialetemporal variations of surface water resources in China since *** vulnerability in current(2010s)and its trends from 2000 to late-2010s in different regions of China were also *** addition,the correspondingly adaptive measures to counter regional risks to water resources were *** concluded that the runoff of major rivers had been decreasing in eastern China and increasing in western China during *** the arid area of Northwest China,the alpine runoff has shown an overall upward trend since the late-1990s/early-2000s,with a 10%-25% increase caused by the increase of glacial meltwater and *** the runoff of each hydrological station in the 2000s-2010s was 34.7% lower than that in the 1950se2010s on *** increases in precipitation and glacial meltwater with global warming caused a rapid expansion of lakes in the qinghai-Tibet Plateau and Xinjiang,thus leading to an increase in total area and water quantity of lakes in China from 1995 to *** mean contribution rates of climate change and human activity to runoff change in river basins of China were 53.5% and 46.5%,respectively,during the period of *** driving factor of runoff change in many river basins has gradually changed from climate change(1950s-2000)to human activity(2000-2018).During 2000-2018,the contributions of human activities to runoff change were 50%-80% in major rivers of eastern *** vulnerability in most areas of Northwest China and North China is generally high,with the vulnerability index greater than ***,in Northeast,East,South,and Central China,it is lower or not *** Southwest China,the vulnerability varies greatly with Yunnan and Sichuan relatively low while Chon

关键词： Runoff change Lake area Surface water vulnerability Adaptation measures China