检索结果-南通市图书馆

The joint knowledge reasoning model based on knowledge representation learning for aviation assembly domain

Science China(Technological Sciences) 2024年第1期67卷 143-156页

作者： LIU PeiFeng QIAN Lu LU Hu XUE Lei ZHAO XingWei TAO bo State Key Laboratory of Digital Manufacturing Equipment and Technology Department of MechanicalHuazhong University of Science and TechnologyWuhan 430074China School of Transportation and Logistics Engineering Wuhan University of Technology(WHUT)Wuhan 430063China Shanghai Aircraft Manufacturing Co. Ltd.Shanghai 201324China

Knowledge graph technology is widely applied in the domain of general knowledge reasoning with an excellent *** fine-grained professional fields,professional knowledge graphs can provide more accurate information in practical industrial *** on an aviation assembly domain-specific knowledge graph,the article constructs a joint knowledge reasoning model,which combines a named entity recognition model and a subgraph embedding learning *** performing knowledge reasoning tasks,the two models vectorize entities,relationships and entity attributes in the same space,so as to share parameters and optimize learning *** knowledge reasoning model,which provides intelligent question answering services,is able to reduce the assembly error rate and improve the assembly *** system can accurately solve general knowledge reasoning problems in the assembly process in actual industrial scenarios of general assembly and component assembly under interference-free ***,this paper compares the proposed knowledge reasoning model based on knowledge representation learning and the question-answering system based on large-scale pre-trained *** the application scenario of system functional testing in general assembly,the joint model attains an accuracy rate of 95%,outperforming gPT with 78%accuracy and enhanced representation through knowledge integration with 71%accuracy.

关键词： intelligent manufacturing knowledge graph aviation assembly knowledge representation knowledge-based question an-swering

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

高速公路长大下坡路段货车运行速度模型适用性分析

引用

公路与汽运 2025年第1期41卷 30-34页

作者：贺九平王世法张驰吕博西安长安大学工程设计研究院有限公司陕西西安710064 四川成绵苍巴高速公路有限责任公司成都分公司四川成都618206 长安大学公路学院陕西西安710064 四川久马高速公路有限责任公司四川阿坝藏族羌族自治州624600

为探究高速公路长大下坡路段货车运行速度的变化规律,以四川西部某山区高速公路30 km长大下坡路段为研究对象,利用高清卡口系统采集该路段2020年某月连续30 d的货车行车数据,分析货车在长大下坡路段的运行特性,并对目前常用运行速度预... 详细信息

为探究高速公路长大下坡路段货车运行速度的变化规律,以四川西部某山区高速公路30 km长大下坡路段为研究对象,利用高清卡口系统采集该路段2020年某月连续30 d的货车行车数据,分析货车在长大下坡路段的运行特性,并对目前常用运行速度预测模型的预测速度与实测速度进行对比分析。结果表明,实测货车速度随下坡距离的增加而降低,与运行速度预测模型预测速度的变化趋势偏差较大;下坡时外地牌照车辆速度降低较快,本地车辆总体趋于平稳。速度衰减率指标的变化情况也表明现有长大下坡路段运行速度预测模型没有考虑货车的频繁制动行为,驾驶人对环境的熟悉程度对长大下坡路段运行速度有显著影响。据此提出长大下坡路段货车运行速度预测模型修正思路。

关键词：交通安全高速公路货车运行速度速度衰减率速度预测模型长大下坡

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Fragmentation behavior of large-caliber PELE impacting RHA plate at low velocity

引用

Defence Technology（防务技术） 2019年第6期15卷 912-922页

作者： Mo-ang Lei Hai-fu Wang Qing-bo Yu Yuan-feng Zheng State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

Impact experiments of large-caliber PELE with various inner-outer diameter ratio perforating RHA plate at low velocity were *** results showed the size of perforated holes on plate,average diameter of damage area on witness plate,and number of behind-armor fragments will increase as d/D increasing from 0.72 to *** and fragmentation of large-caliber PELE in this condition were also numerically studied with ANSYS ***,an analytical model accounting for an additional radial shock wave was presented to predict radial expansion velocity and fragmentation of jacket,as well as an empirical approach to estimate diameter of damage *** results by these approaches were in good agreement with experiments and numerical *** discussion revealed that Shock/rarefaction wave interactions behavior varying with inner-outer diameter ratio is an important mechanism resulting in different lateral effect by PELE projectiles with various configurations.

关键词： PELE Enhanced lateral effect Penetration mechanics Behind-armor fragments

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Secondary Precipitation Behavior of Nitride in the Electro-slag Remelted Structure of Alloy 690

引用

Acta Metallurgica Sinica(English Letters) 2017年第8期30卷 771-780页

作者： Min Wang bo Chen Xian-Chao Hao Ying-Che Ma Kui Liu Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The precipitation and evolution of secondary nitrides （S-nitrides） in the Alloy 690 electro-slag remelted （ESR） structure were investigated. Experimental results indicate that S-nitrides precipitated in the interdendritic region of the ESR structure at temperatures higher than 1100 ℃. S-nitrides could spread throughout the entire interdendritic area after sufficient exposure, and they were more numerous and much finer than primary nitrides. Furthermore, after studying the evolution of S-nitride particles at 1100, 1200 and 1300℃, it was determined that the precipitation of S-nitrides was controlled by the diffusion of nitrogen. In addition, by investigating the elemental segregation of ESR structure and calculating critical Ti concentrations, S-nitride precipitation was found to be thermodynamically inevitable in the Alloy 690 ESR structure.

关键词： Alloy 690 ESR Nitride Precipitation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Optimizing surface-engineered ultra-small gold nanoparticles for highly efficient miRNA delivery to enhance osteogenic differentiation of bone mesenchymal stromal cells

引用

Nano Research 2017年第1期10卷 49-63页

作者： Meng Yu bo Lei Chuanbo gao Jin Yan Peter X. Ma Frontier Institute of Science and Technology Xi'an Jiaotong University Xi'an 710054 China State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710054 China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiootong University Xi'an 710054 China Department of Biomedical Engineering University of Michigan Ann Arbor M148109-2009 USA Macromolecular Science and Engineering Center University of Michigan Ann Arbor M148109-1055 USA Department of Materials Science and Engineering University of Michigan Ann Arbor M148109-1078 USA

Regulation of osteogenic differentiation of bone mesenchymal stromal cells （BMSCs） plays a critical role in bone regeneration. As small non-coding RNAs, microRNAs （miRNAs） play an important role in stem cell differentiation through regulating target-mRNA expression. Unfortunately, highly efficient and safe delivery of miRNAs to BMSCs to regulate their osteogenic differentiation remains challenging. Conventional inorganic nanocrystals have shown increased toxicity owing to their larger size precluding renal clearance. Here, we developed novel, surface-engineered, ultra-small gold nanoparticles （USAuNPs, 〈10 nm） for use as highly efficient miR-5106-delivery systems to enable regulation of BMSC differentiation. We exploited the effects of AuNPs coated layer-by-layer with polyethylenimine （PEI） and liposomes （Lipo） to enhance miR-5106-delivery activity and subsequent BMSC differentiation capacity. The PEI- and Lipo-coated AuNPs （Au@PEI@Lipo） showed negligible cytotoxicity, good miRNA-5106-binding affinity, highly efficient delivery of miRNAs to BMSCs, and long-term miRNA expression （21 days）. Additionally, compared with commercial Lipofectamine 3000 and 25 kD PEI, the optimized Au@PEI@Lipo-miR-5106 nanocomplexes significantly enhanced BMSC differentiation into osteoblast-like cells through activation of the Sox9 transcription factor. Our findings reveal a promising strategy for the rational design of ultra-small inorganic nanoparticles as highly efficient miRNA-delivery platforms for tissue regeneration and disease therapy.

关键词： ultra-small goldnanoparticles surface engineering microRNA (miRNA)delivery bone mesenchymalstromal cells osteogenic differentiation

来源：

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

基于灭火救援指挥箱的化学泄漏事故辅助决策分析

引用

中国应急救援 2025年第1期 50-54页

作者：薄淇友李向欣郭其云江苏省消防救援总队南京市支队中国人民警察大学

在化学泄漏事故应急处置过程中,如何借助辅助手段和先进技术提高指挥决策的科学性,是目前指挥员急需解决的重要问题。在总结化学泄漏事故特点的基础上,结合灭火救援指挥箱的系统功能,分析了应急决策的方法和原则。以氨气泄漏事故为例,... 详细信息

在化学泄漏事故应急处置过程中,如何借助辅助手段和先进技术提高指挥决策的科学性,是目前指挥员急需解决的重要问题。在总结化学泄漏事故特点的基础上,结合灭火救援指挥箱的系统功能,分析了应急决策的方法和原则。以氨气泄漏事故为例,利用灭火救援指挥箱在信息查询、危害评估、态势标绘等方面的功能,分析了指挥员在查询事故信息、预测灾情变化、了解现场情况、部署救援力量以及制订救援方案的决策依据,从而为消防救援指挥员化学事故处置提供参考。

关键词：灭火救援指挥箱化学事故泄漏辅助决策分析

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Microstructure characterization of a pressureless infiltrating oxidized SiCp preform by Al-8Mg

引用

International Journal of Minerals,Metallurgy and Materials 2011年第2期18卷 223-228页

作者： Shu-bin Ren Xiao-yu Shen Xin-bo He Xuan-hui Qu School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

The microstructure of a pressureless infiltrating 55vol% oxidized SiC preform by Al-8Mg alloy was characterized by transmission electron microscopy （TEM）, high resolution TEM （HRTEM）, field emission scanning electron microscopy （FE-SEM）, and X-ray diffraction. The TEM image of the interface between Al and SiC shows that the surface of SiC is covered by a rough nanocrystal layer of MgAl2O4, Al2O3, and Si, produced by the interfacial reaction of Al, Mg, and SiO2 on the surface of SiC. The Al-SiC interface is also examined by HRTEM to be better understood how MgAl2O4 and Al2O3 are produced. Dendritic Al2O3 crystals are embedded in the pores of the composite generated from the mutual bonding of SiO2 on the surface of SiC. Columnar AlN crystals of about 250 nm in length are bunched vertically on the SiC particle surface.

关键词： microstructure composites interfaces pressureless infiltration oxidation.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of dietary phosphorous supplementation on laying performance,egg quality,bone health and immune responses of laying hens challenged with Escherichia coli lipopolysaccharide

引用

Journal of Animal Science and Biotechnology 2018年第4期9卷 980-990页

作者： Wei Nie bo Wang Jing gao Yuming guo Zhong Wang State Key Laboratory of Animal Nutrition College of Animal Science and Technology China Agricultural University Department of Animal Science Washington State University

Background: Phosphorus is an essential nutrient to maintain poultry health and performance. The objective of this study was to evaluate the effect of dietary phosphorus levels on egg production, egg quality, bone health, immune responses of laying hens challenged with Escherichia coli ***: Three hundred laying hens at 28 wk were randomly divided into 2 dietary treatments with 10 replicates of 15 birds. The wheat-soybean based diets contained either 0.12% or 0.4% non-phytate phosphorus(NPP). At 32 wk of age, all the birds of each dietary treatment were injected into the abdomen with 1.5 mg/kg body weight(BW) of either LPS or saline once a day at 24-h intervals for continuous 9 d. The performance of laying hens was evaluated for 9 d. The eggs after the fifth injection were collected to value the egg quality. Three hours after the first injection, blood was collected to measure serum metabolite and immune response associated *** hours after the fifth injection, the hens were euthanized to obtain tibia, cecal tonsils and ***: Compared with saline-injected hens, LPS-injected hens had lower feed intake and egg production(P ggshell thickness, strength, albumin height and Haugh unit were significantly increased in LPS-injected hens compared with saline-injected hens(P g hens challenged with LPS had lower villious height/crypt depth ration than those received saline. Serum calcium, phosphorus and SOD activities significantly decreased in the LPS-injected hens compared with the control(P gulated expression of IL-1β, IL-6 and IL-10 in cecum, and serum concentration of MDA, IL-1β and IL-6(P gnificantly increased(P ght/crypt depth ratio, decreased(P < 0.05) serum MDA and IFN-γ concentration compared with the 0.12% non-phytate phosphorus ***: In summary, this study demonstrates t

关键词： Egg quality Immune response Laying hens Lipopolysaccharide Phosphorus

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Resolving the gPU responsiveness dilemma through program transformations

引用

Frontiers of Computer Science 2018年第3期12卷 545-559页

作者： Qi ZHU bo WU Xipeng SHEN Kai SHEN Li SHEN Zhiying WANg National Key Laboratory of High Performance Computing National University of Defense Technology Changsha 410073 China Jiangnan Institute of Computing Technology Wuxi 214083 China Department of Computer Science North Carolina State University Raleigh NC 27695 USA EECS Colorado School of Mines Golden CO 80401 USA Department of Computer Science University of Rochester Rochester NY 14627 USA

The emerging integrated CPU-gPU architectures facilitate short computational kernels to utilize gPU acceleration. Evidence has shown that, on such systems, the gPU control responsiveness （how soon the host program finds out about the completion of a gPU kernel） is essential for the overall performance. This study identifies the gPU responsiveness dilemma： host busy polling responds quickly, but at the expense of high energy consumption and interference with co-running CPU programs; interrupt-based notification minimizes energy and CPU interference costs, but suffers from substantial response delay. We present a programlevel solution that wakes up the host program in anticipation of gPU kernel completion. We systematically explore the design space of an anticipatory wakeup scheme through a timerdelayed wakeup or kernel splitting-based pre-completion notification. Experiments show that our proposed technique can achieve the best of both worlds, high responsiveness with low power and CPU costs, for a wide range of gPU workloads.

关键词： program transformation gPU integrated architecture responsiveness

来源：

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

Adipo8, a high-affinity DNA aptamer, can differentiate among adipocytes and inhibit intracellular lipid accumulation in vitro

引用

Science China Chemistry 2015年第10期58卷 1612-1620页

作者： Ke Chen Jun Liu guoxiang Tong bo Liu guodong Wang Huixia Liu Xiangya Hospital Central South University

Obesity is primarily caused by the excessive accumulation of white adipose tissues(WAT). We previously obtained an adipocyte-specific aptamer termed Adipo8 in vitro. In this present study, this adipocyte-specific aptamer Adipo8 was first chemically modified by introduction of phosphorothioate linkages(PS-linkages) and then conjugated to polyethylene glycol(PEg), we tested whether this modified aptamer could distinguish mature white adipocytes from 3T3-L1 preadipocytes or brown adipocytes. To verify the binding affinity of this aptamer to mature white adipocytes in vivo as well as in vitro, we tested whether modified Adipo8 could specifically bind to the WAT of Diet-Induced Obesity(DIO) C57BL/6 mice. Finally, we examined the effect of Adipo8 on the adipogenic differentiation of mature white adipocytes. Based on our results, PS-modified aptamer demonstrated its high binding affinity and specificity, and was able to distinguish white adipocytes from 3T3-L1 preadipocytes or brown adipocytes in vitro. PS-modified Adipo8 also demonstrated more biostability and prolonged binding time in biological fluids. Additionally, Adipo8 could inhibit adipogenic differentiation of adipose tissue, possibly by inhibiting the expression of PPAR-γ in adipose tissue. This modified aptamer holds great promise as a stable molecular recognition tool for targeted delivery to adipocytes and has potential in the treatment of obesity.

关键词： DNA aptamer adipocyte modification adipogenic PPAR-γ

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：