检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

基于九屏幕法的计算机绘图相似辨识方法研究

计算机仿真 2024年第9期41卷 238-242页

作者：王立新张文硕郑州大学机械与动力工程学院

为了制止学生使用AutoCAD绘图在各类教学中的诸多图形相似行为，在TRIZ的九屏幕法启发下，提出基于AutoCAD绘图过程的相似辨识方法。利用ObjectARX开发了学生端记录辨识图形相似的特征信息插件，基于Python、Django、MySQL等开发了B/S... 详细信息

为了制止学生使用AutoCAD绘图在各类教学中的诸多图形相似行为，在TRIZ的九屏幕法启发下，提出基于AutoCAD绘图过程的相似辨识方法。利用ObjectARX开发了学生端记录辨识图形相似的特征信息插件，基于Python、Django、MySQL等开发了B/S模式的教师端图形相似辨识系统。先通过九屏幕法对问题进行分析，得到解决问题的资源；其次，分析学生绘图过程的产生相似图形的绘图方式；再次，分析这些绘图方式所引起的特征信息变化；然后，利用开发的插件将特征信息存入数据库；最后，使用这些特征信息来进行相似图档的辨识。通过教学实践表明这套方法可以有效制止学生图形相似，显著提高计算机绘图的教学效果。

关键词：九屏幕法二次开发特征信息计算机绘图相似辨识

UMU+BOPPPS混合教学模式探索——基于“中医外科学”皮肤性病章节

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

教育教学论坛 2024年第4期 140-143页

作者：王丽新崔瑞琴宁夏医科大学中医学院宁夏银川750004 宁夏医科大学宁夏少数民族医药现代化教育部重点实验室宁夏银川750004

目的:探讨“UMU+BOPPPS”混合教学模式的课堂效果。方法:按班级将学生分为传统教学组和“UMU+BOPPPS”教学组,对“中医外科学”皮肤性病章节的内容分别进行两种不同模式的授课,在授课结束后进行章节考试及课堂效果问卷调查,对两组学生... 详细信息

目的:探讨“UMU+BOPPPS”混合教学模式的课堂效果。方法:按班级将学生分为传统教学组和“UMU+BOPPPS”教学组,对“中医外科学”皮肤性病章节的内容分别进行两种不同模式的授课,在授课结束后进行章节考试及课堂效果问卷调查,对两组学生的学习成绩及学生体会进行统计分析。结果:“UMU+BOPPPS”混合教学模式能够有效提高学生学习的积极性和参与度,提高课堂教学效果,提高学习成绩。结论:“UMU+BOPPPS”混合式教学模式在激发学生学习兴趣、构建知识体系、培养中医思维等方面效果突出,值得进一步推广。

关键词： UMU BOPPPS 参与式学习教学设计

Bifurcations of limit Cycles in a Z_4-Equivariant Quintic Planar Vector Field

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2010年第4期26卷 779-798页

作者： Yu Hai WU Xue Di wang li xin TIAN Department of Mathematics Jiangsu University Zhenjiang 212013 P. R. China

In this paper, a Z4-equivariant quintic planar vector field is studied. The Hopf bifurcation method and polycycle bifurcation method are combined to study the limit cycles bifurcated from the compounded cycle with 4 hyperbolic saddle points. It is found that this special quintic planar polynomial system has at least four large limit cycles which surround all singular points. By applying the double homoclinic loops bifurcation method and Hopf bifurcation method, we conclude that 28 limit cycles with two different configurations exist in this special planar polynomial system. The results acquired in this paper are useful for studying the weakened 16th Hilbert＇s Problem.

关键词： compounded cycle double homoclinic loops stability bifurcation limit cycles distribution of limit cycles

在线全文

学校读者我要写书评

暂无评论

深部脑刺激在物质成瘾中的研究进展

中国药物依赖性杂志 2024年第2期33卷 96-101,108页

作者：李元荣黄静静王利新王绪轶中南大学湘雅二医院精神卫生研究所长沙410011

近年来,深部脑刺激在成瘾领域的应用越来越广泛,然而其确切的机制尚不清楚。本文对深部脑刺激在酒精使用障碍、阿片类使用障碍、兴奋剂使用障碍中的相关研究进行综述,列举了相关的临床研究及动物实验,总结了深部脑刺激治疗成瘾的可能机... 详细信息

近年来,深部脑刺激在成瘾领域的应用越来越广泛,然而其确切的机制尚不清楚。本文对深部脑刺激在酒精使用障碍、阿片类使用障碍、兴奋剂使用障碍中的相关研究进行综述,列举了相关的临床研究及动物实验,总结了深部脑刺激治疗成瘾的可能机制,并探讨了该技术的未来展望。

关键词：深部脑刺激物质成瘾伏隔核

基于学生能力培养的空气动力学及飞行原理课程改革实践——以新疆职业大学为例

在线全文

学校读者我要写书评

暂无评论

新疆职业大学学报 2024年第1期32卷 60-62,67页

作者：鱼强蒋蓓王立新马利东新疆职业大学智慧交通学院新疆乌鲁木齐830013 新疆职业大学智能制造学院新疆乌鲁木齐830013

以新疆职业大学建设飞机操纵系统实训室为契机,针对学生在学习空气动力学及飞行原理中存在的理论与实践难以融合、缺少实践实训课程等问题进行课程改革。以CCAR66-R3民用航空器维修培训内容为指导,引入国产商用大飞机相关教学案例,注重... 详细信息

以新疆职业大学建设飞机操纵系统实训室为契机,针对学生在学习空气动力学及飞行原理中存在的理论与实践难以融合、缺少实践实训课程等问题进行课程改革。以CCAR66-R3民用航空器维修培训内容为指导,引入国产商用大飞机相关教学案例,注重融入“当代民航精神”“三个敬畏”“机务作风”等民航价值观教育,全程构建素质和技能培养框架,突出学生动手能力和专业技能的培养,充分调动和激发学生的学习兴趣,具体措施包括将专业基础教育和工程实践能力培养有机结合起来、飞机模型与飞行原理相结合、多媒体教学与模拟仿真相结合、启发式教学与技能大赛相结合以及航空科研与课程思政相结合的方法,形成了“岗课赛证”相融通的课程培养体系。

关键词：空气动力学价值观教育岗课赛证实践能力

在线全文

学校读者我要写书评

暂无评论

不同厂家乙基纤维素结构中红外光谱研究

石家庄学院学报 2024年第3期26卷 48-52,61页

作者：王春润雷晓静常利双关鑫伟张勇常明王丽欣高佳丽河北科技大学化学与制药工程学院河北石家庄050018 石家庄学院化工学院河北石家庄050035

中红外(MIR)光谱研究对乙基纤维素及下游产品的开发具有重要价值.采用MIR光谱技术对不同厂家的乙基纤维素(EC)进行结构对比实验研究,实验发现:不同来源的乙基纤维素在O—H基团伸缩振动模式(v_(O—H-EC))、CH3基团不对称伸缩振动模式(v_(... 详细信息

中红外(MIR)光谱研究对乙基纤维素及下游产品的开发具有重要价值.采用MIR光谱技术对不同厂家的乙基纤维素(EC)进行结构对比实验研究,实验发现:不同来源的乙基纤维素在O—H基团伸缩振动模式(v_(O—H-EC))、CH3基团不对称伸缩振动模式(v_(asCH3-EC))、CH3基团对称伸缩振动模式(v_(sCH3-EC))、CH2基团不对称伸缩振动模式(v_(asCH2-EC))、C—H基团伸缩振动模式(v_(C—H-EC))、CH3基团对称弯曲振动模式(δ_(sCH3-EC))、C—O基团伸缩振动模式(v_(C—O-EC))和OC2H3基团振动模式(v_(OC2H3-EC))处的红外吸收存在一定的差异性.半定量研究表明:不同来源的乙基纤维素中均存在羰基化合物和酰胺化合物,但其吸收模式和吸收强度也存在一定的差异性.

关键词：中红外光谱乙基纤维素结构杂质半定量

Quantum self-attention neural networks for text classification

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第4期67卷 301-313页

作者： Guangxi li Xuanqiang ZHAO xin wang Institute for Quantum Computing Baidu Research Centre for Quantum Software and Information University of Technology Sydney QICI Quantum Information and Computation Initiative Department of Computer ScienceThe University of Hong Kong Thrust of Artificial Intelligence Information HubHong Kong University of Science and Technology(Guangzhou)

An emerging direction of quantum computing is to establish meaningful quantum applications in various fields of artificial intelligence, including natural language processing(NLP). Although some efforts based on syntactic analysis have opened the door to research in quantum NLP(QNLP), limitations such as heavy syntactic preprocessing and syntax-dependent network architecture make them impracticable on larger and real-world data sets. In this paper, we propose a new simple network architecture, called the quantum selfattention neural network(QSANN), which can compensate for these limitations. Specifically, we introduce the self-attention mechanism into quantum neural networks and then utilize a Gaussian projected quantum self-attention serving as a sensible quantum version of self-attention. As a result, QSANN is effective and scalable on larger data sets and has the desirable property of being implementable on near-term quantum devices. In particular, our QSANN outperforms the best existing QNLP model based on syntactic analysis as well as a simple classical self-attention neural network in numerical experiments of text classification tasks on public data sets. We further show that our method exhibits robustness to low-level quantum noises and showcases resilience to quantum neural network architectures.

关键词： quantum neural networks self-attention natural language processing text classification parameterized quantum circuits

Synthesis and Biological Activity of Novel 2,3-Dihydro-2-phenylsulfonylhydrazono-3-(2′,3′,4′,6′-tetra-O-acetyl-β-D-glucopyranosyl)thiazoles

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2009年第1期25卷 52-55页

作者： wang Hao-an li Yu-xin li Zheng-ming CHENG Hai-ying wang Su-hua liU Bin Elemento-Organic Chemistry Institute State Key Laboratory of Elemento-Organic Chemistry National Pesticide Engineering Research Center Nankai University Tianjin 300071 P. R. China

A series of novel 2,3-dihydro-2-phenylsulfonylhydrazono-3-（2＇,3＇,4＇,6＇-tetra-O-acetyl-β-D-glucopyranosyl）thiazoles were designed and synthesized via the reaction of thiosemicarbazide with chloroaldehyde. Their chemical structures were characterized by ^1H and ^13C NMR spectroscopy and elemental analysis. The bioassay results indicate that some of these compounds exhibit moderate fungicidal and herbicidal activities.

关键词： Synthesis 2,3-Dihydrothiazole Biological activity

Vibration transfer from underground train to multi-story building:Modelling and validation with in-situ test data

在线全文

学校读者我要写书评

暂无评论

Underground Space 2024年第6期19卷 301-316页

作者： li wang xin Gao Caiyou Zhao Ping wang Zili li Section of Railway Engineering Delft University of TechnologyStevinweg 12628CN DelftThe Netherlands Key Laboratory of High-speed Railway Engineering(Southwest Jiaotong University) Ministry of EducationChengdu 610031China

Excessive underground train-induced vibration becomes a serious environmental problem in *** investigate the vibration transfer from an underground train to a building nearby,an explicit-integration time-domain,three-dimensional finite element model is *** underground train,track,tunnel,soil layers and a typical multi-story building nearby are all fully coupled in this *** complex geometries involving the track components and the building are all modelled in detail,which makes the simulation of vibration transfer more realistic from the underground train to the *** model is validated with in-situ tests data and good agreements have been achieved between the numerical results and the experimental results both in time domain and frequency *** proposed model is applied to investigate the vibration transfer along the floors in the building and the influences of the soil stiffness on the vibration characteristics of the track-tunnel-soil-building *** is found that the building vibration induced by an underground train is dominant at the frequency determined by the P2 resonance and influenced by the vibration modes of the *** vertical vibration in the building decreases in a fluctuant pattern from the foundation to the top floor due to loss of high frequency contents and local *** vibration levels in different rooms at a same floor can be different due to the different local stiffness.A room with larger space thus smaller local stiffness usually has higher vibration *** soil layers make the tunnel lining and the building have more low frequency *** influence of the soil stiffness on the amplification scale along the floors of the building is found to be nonlinear and frequency-dependent,which needs to be further investigated.

关键词： Railway vibration Underground train Multi-story building vibration Finite element model Dynamic interaction