检索结果-南通市图书馆

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

论数字全球化时代学生深度学习研究转向

中国电化教育 2025年第1期 117-125页

作者：李沁李森陕西师范大学教育学部陕西西安710062 陕西教师发展研究院陕西西安710062

数字全球化引发学生深度学习全域变革。基于本体论、认识论、方法论、价值论与实践论,考量数字文明新形态、数字技术更迭、数字思维转型、数字生存新境遇以及数字学习新生态下的学生深度学习研究的新挑战与新机遇。希冀以整体生命发展... 详细信息

数字全球化引发学生深度学习全域变革。基于本体论、认识论、方法论、价值论与实践论,考量数字文明新形态、数字技术更迭、数字思维转型、数字生存新境遇以及数字学习新生态下的学生深度学习研究的新挑战与新机遇。希冀以整体生命发展观、复杂性认识思想以及超学科研究方法论,引领学生深度学习实践智慧价值体系建构,延拓时空融通的深度学习实践研究场域。

关键词：数字全球化深度学习境遇审思研究转向

Cross-correlations between signal's components

在线全文

学校读者我要写书评

暂无评论

CHINESE PHYSICS B 2025年第2期34卷 483-494页

作者： Zhao, Quankun li, sen Gu, Changgui Wang, Haiying Yang, Huijie Univ Shanghai Sci & Technol Dept Syst Sci Shanghai 200093 Peoples R China

Detecting coupling pattern between elements in a complex system is a basic task in data-driven analysis. The trajectory for each specific element is a cooperative result of its intrinsic dynamic, its couplings with other elements, and the environment. It is subsequently composed of many components, only some of which take part in the couplings. In this paper we present a framework to detect the component correlation pattern. Firstly, the interested trajectories are decomposed into components by using decomposing methods such as the Fourier expansion and the Wavelet transformation. Secondly, the cross-correlations between the components are calculated, resulting into a component cross-correlation matrix (network). Finally, the dominant structure in the network is identified to characterize the coupling pattern in the system. Several deterministic dynamical models turn out to be characterized with rich structures such as the clustering of the components. The pattern of correlation between respiratory (RESP) and ECG signals is composed of five sub-clusters that are mainly formed by the components in ECG signal. Interestingly, only 7 components from RESP (scattered in four sub-clusters) take part in the realization of coupling between the two signals.

关键词： coupling structure cross-correlation matrix component correlation network 87.85.Ng 64.60.aq 11.15.Me

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

体外发酵表征膳食纤维性质研究进展

食品与发酵工业 2025年第1期51卷 337-344页

作者：李帮秀谭斌李森吴娜娜上海理工大学健康科学与工程学院上海200082 国家粮食和物资储备局科学研究院北京100037

肠道微生物在人体健康中发挥着重要作用,它们的相互作用和代谢会影响人体的生理状况。而膳食纤维是肠道细菌的主要能量来源,通过调节肠道微生物群组成和促进短链脂肪酸(short chain fatty acids,SCFA)的产生来促进人体健康。膳食纤维在3... 详细信息

肠道微生物在人体健康中发挥着重要作用,它们的相互作用和代谢会影响人体的生理状况。而膳食纤维是肠道细菌的主要能量来源,通过调节肠道微生物群组成和促进短链脂肪酸(short chain fatty acids,SCFA)的产生来促进人体健康。膳食纤维在37℃条件下与粪便菌液混合进行体外发酵实验。该文综述了体外发酵过程中膳食纤维对肠道微生物群的作用以及膳食纤维性质变化方面的研究,膳食纤维的不同物理和化学结构是决定发酵速率、短链脂肪酸谱和不同细菌群生长的关键因素。但不同来源的膳食纤维对健康肠道生态系统的影响鲜有报道。该文对不同来源和性质的膳食纤维对人类肠道微生物群的调节作用,和如何通过膳食纤维促进健康进行综述。

关键词：膳食纤维性质体外发酵肠道微生物群短链脂肪酸

中国特色教学论标识性概念构建的逻辑框架与实践构想

在线全文

学校读者我要写书评

暂无评论

课程.教材.教法 2025年第1期45卷 41-47页

作者：张姝朱艳李森四川师范大学教育科学学院成都610066 陕西师范大学教育学部西安710062

中国特色教学论标识性概念是对中国教育教学实践现象、规律及其内在关系的深刻概括与抽象提炼,具有根基性、统摄性、自主性、原创性等特征。中国教学论概念构建过程中凸显概念依附、概念悬浮、概念交织等问题,因此,构建中国特色教学论... 详细信息

中国特色教学论标识性概念是对中国教育教学实践现象、规律及其内在关系的深刻概括与抽象提炼,具有根基性、统摄性、自主性、原创性等特征。中国教学论概念构建过程中凸显概念依附、概念悬浮、概念交织等问题,因此,构建中国特色教学论标识性概念应以“本土为基”为逻辑起点、“实践为本”为逻辑遵循、“体系为方”为逻辑指向,通过不断深化研究主体意识,明确概念提炼与发明的两大路径,以树形结构、阶梯状结构、网状结构构建标识性概念体系。

关键词：教学论标识性概念自主知识体系以中国为方法

Ultraviolet spectral broadening by stimulated rotational Raman scattering on nitrogen pumped with signal laser injection

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2025年第1期10卷 33-38页

作者： Xiangbing Wang Xiangxu Chai Ping li Bo Zhang Qihua Zhu Xiaocheng Tian Ju Wang Zhaoyu Zong Song Zhou Ke Yao sen li Junpu Zhao Zhitao Peng Laser Fusion Research Center China Academy of Engineering PhysicsMianyang 621900China

We present experimental results on kilojoule ultraviolet laser output with 1%spectral *** stimulated rotational Raman scattering(SRRS)with signal laser injection,we achieve effective spectral broadening in short-range propagation,with good retention of the original near-field distribution and time *** calculations show that 2%bandwidth spectral broadening can be achieved by injecting 20 kW~cm^(2) signal light at 2.2 GW~cm^(2) flux of the pump *** addition,high-frequency modulation in the near field can be effectively avoided through replacement of the original random noise signal light by the controllable signal *** SRRS in the atmospheric environment excited with signal laser injection can provide wide-band light output with controllable beam quality without long-distance propagation,representing an important potential route to realization of broadband laser drivers.

关键词： scattering pumped pump

在线全文

学校读者我要写书评

暂无评论

南黄海盆地南部海相构造层研究新进展

海洋地质前沿 2025年第2期41卷 12-20页

作者：杨艳秋李森梁杰孙晶中国地质调查局青岛海洋地质研究所青岛266237 青岛海洋科技中心海洋矿产资源评价与探测技术功能实验室青岛266237 山东省地质科学研究院济南250013

以南黄海盆地南部为研究区,二叠系上统—三叠系下统为研究对象,根据近年来新采集和处理的二维地震资料,对该区域的海相构造层进行了深入分析,取得了一些新的地质认识。研究表明:南黄海盆地南部广泛发育早三叠世—晚二叠世地层,最大残留... 详细信息

以南黄海盆地南部为研究区,二叠系上统—三叠系下统为研究对象,根据近年来新采集和处理的二维地震资料,对该区域的海相构造层进行了深入分析,取得了一些新的地质认识。研究表明:南黄海盆地南部广泛发育早三叠世—晚二叠世地层,最大残留厚度超过3000 m;海相构造层的断裂系统主要呈NW—NWW和近EW走向,发育海相中—古生界的挤压断裂体系和陆相中—新生界的拉张断裂体系;根据断裂发育时间,可将其活动期次划分为印支期和燕山-喜山期;同时,根据断裂的平面展布及组合特征,可划分出4类构造样式和9种断裂组合。通过对油气地质条件的分析认为,上古生界是南黄海盆地南部海相构造层的油气勘探方向。该研究成果为南黄海海相油气勘探提供了新的拓展区域。

关键词：南黄海盆地南部海相构造层上古生界断裂系统油气勘探

基于孔洞扩张模型的偏心受力焊接球节点延性断裂数值模拟

在线全文

学校读者我要写书评

暂无评论

工程力学 2025年第2期42卷 190-198页

作者：尹越韩磊旺徐丽森李福康天津大学建筑工程学院天津300072 滨海土木工程结构与安全教育部重点实验室天津300072

在单层网壳结构中,焊接球节点偏心受力,常规有限元分析无法准确确定其与延性断裂对应的极限承载力。该文采用孔洞扩张模型(VGM)对偏心受力焊接球节点的延性断裂进行研究,明确了偏心受压和偏心受拉焊接球节点的失效模式,准确确定了偏心... 详细信息

在单层网壳结构中,焊接球节点偏心受力,常规有限元分析无法准确确定其与延性断裂对应的极限承载力。该文采用孔洞扩张模型(VGM)对偏心受力焊接球节点的延性断裂进行研究,明确了偏心受压和偏心受拉焊接球节点的失效模式,准确确定了偏心受拉焊接球节点延性断裂的位置和极限承载力。针对孔洞扩张模型要求极小有限元网格、计算效率较低的问题,采用基于VGM的连续损伤模型(CDM),编制用户子程序,在有限元分析中删除满足断裂判据的单元,对偏心受拉焊接球节点延性断裂全过程进行了数值模拟,通过与孔洞扩张模型的对比,验证了基于VGM的连续损伤模型对焊接球节点延性断裂分析的适用性。基于VGM的连续损伤模型允许采用较大网格进行断裂后裂纹扩展的数值模拟,极大地降低了计算成本。

关键词：延性断裂焊接球节点偏心受力连续损伤模型孔洞扩张模型

Investigation of the methane hydrate surface area during depressurization-induced dissociation in hydrate-bearing porous media

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2021年第4期34卷 324-334页

作者： Xuke Ruan Xiao-sen li Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhou 510640China CAS Key Laboratory of Gas Hydrate Guangzhou 510640China

The surface area of hydrate during dissociation in porous media is essentially important for the kinetics of hydrate *** this study,the methane hydrate surface area was investigated by the comparison results of experiments and numerical simulations during hydrate decomposition in porous *** experiments of methane hydrate depressurizationinduced dissociation were performed in a 1D high pressure cell filled with glass beads,an improved and valid 1D corescale numerical model was developed to simulate gas *** conceptual models for hydrate dissociation surface area were proposed based on the morphology of hydrate in porous media,which formed the functional form of the hydrate dissociation surface area with porosity,hydrate saturation and the average radius of sand sediment *** the establishment of numerical model for depressurizationinduced hydrate dissociation in porous media,the cumulative gas productions were modeling and compared with the experimental data at the different hydrate *** results indicated that the proposed prediction equations are valid for the hydrate dissociation surface area,and the graincoating surface area model performs well at lower hydrate saturation for hydrate dissociation simulation,whereas at higher hydrate saturation,the hydrate dissociation simulation from the porefilling surface area model is more ***,the sensitivity analysis showed that the hydrate dissociation surface area has a significant impact on the cumulative gas production.

关键词： Surface area Methane hydrate Hydrate dissociation Hydrate morphology Depressurization

The secular effect of gravitational radiation damping on the periastronadvance of binary stars in second order perturbation theory

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2017年第8期17卷 81-88页

作者： lin-sen li School of Physics Northeast Normal University Changchun 130024 China

The second order perturbation effect of gravitational radiation damping on the periastron advance of binary stars is *** second order analytic solution is obtained based on the first order theory in the 2014 article by *** results show that secular variation exists in the periastron advance of binary stars in the second order theory,but secular variation does not exist in the first order perturbation *** results for two compact binary stars(PSR J0737–3039 and M33 X-7)are given,demonstrating the theoretical significance even though the effect is very small.

关键词： binaries close—gravitational wave—celestial mechanics