Permeability differences based on three-dimensional geometrical information of void spaces

In this study,the permeabilities of Berea and Otway sandstones were measured under different confining pressures,and porosity was investigated through mercury intrusion porosimetry(MIP).The total porosities of the Berea and Otway sandstones were approximately 17.4%and 25%,respectively.Pore size distributions of each sandstone were almost the same,but the pores in the Otway sandstone were slightly narrower.However,the permeability of the Otway sandstone was smaller than that of the Berea sandstone by one order of magnitude.Three-dimensional(3D)void geometry and geometrical properties of the void spaces relevant to flow were compared to obtain the relation between the permeability differences and porosities of the two sandstones.The 3D geometrical analysis using microfocus X-ray computed tomography(CT)was performed,and the pore geometries of both sandstones were compared using the 3D medial axis(3DMA)method.Pore and throat radii,pore coordination number,tortuosity,number of connecting paths,connecting path volume,and other factors were determined using 3DMA.The Otway sandstone was characterized by a small effective throat/pore radius ratio.Based on the fluid flow mechanism,the lower effective throat/pore radius ratio results in a lower permeability induced by the fluid energy loss,which means that the 3D geometrical shape of void spaces affects the permeability value.

Three-dimensional Information Decoupling System Based on PSD and Deviation Correction

Three-dimensional Information Decoupling System Based on PSD were designed based on LabVIEW, in order to achieve precision, timeliness, reliability require-ments of the PSD used in the ATP system of Satellite Earth quantum communication. Firstly, the laser light source was driven by a stepper motor to scan on the PSD photosensitive surface, and the voltage value was collected and calculated to get the spot position. Analyzing the cause of nonlinear, a mathematical model was built between the actual value and the measured value by using binary quadratic polynomial method, PSD nonlinear correction function would be got. Then, the object micro displacement and angle offset were measured by combining optical triangulation method, and the error of the measurement results was corrected. Experimental results showed that, after the correction, the measuring deviation could be significantly reduced, the PSD performance calibration requirements was achieved, the efficiency of the system was developed greatly by using LabVIEW.

Exploring the Three-dimensional Framework of Knowledge Service in the field of Library and Information Science(LIS)

The evolution of the society and economy has stimulated the development of Knowledge Service(KS), making it an indispensable solution to address future challenges facing libraries and information institutions. However at present, academic research on knowledge service is falling short and its definition is far from clear and complete. As such,this article proposes the Three-dimensional Framework Knowledge Service(TdFKS) for libraries and information institutions based on the knowledge value chain model. By making reliability analysis and mean value analysis of a questionnaire survey result, the article clarifies the structure of the three-dimensional framework and verifies the rationality of the TdFKS.

Public Speaking的技巧与策略(8)——如何进行Informative Presentation

演讲和面对面谈话非常相似。如果我们想教授某一种技能,如演示性演讲,我们必须首先让听众知道我们想让他们了解什么,做什么。如果是劝说式演讲或辩论,我们必须在劝服听众相信我们的观点前使他们了解所要讨论的题目。这种告知听众的做法要求我们清晰简洁地提出我们的主题,然后用具体的细节、例证来支持主题或在辩论中提出具体明确的参考材料。

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision. It is important for certification institutions to explore methods for updating and transferring present standards, to accelerate the transfer of standard information and ensure present standards are implemented in a timely manner.

Research on Heterogeneous Information Network Link Prediction Based on Representation Learning

A heterogeneous information network,which is composed of various types of nodes and edges,has a complex structure and rich information content,and is widely used in social networks,academic networks,e-commerce,and other fields.Link prediction,as a key task to reveal the unobserved relationships in the network,is of great significance in heterogeneous information networks.This paper reviews the application of presentation-based learning methods in link prediction of heterogeneous information networks.This paper introduces the basic concepts of heterogeneous information networks,and the theoretical basis of representation learning,and discusses the specific application of the deep learning model in node embedding learning and link prediction in detail.The effectiveness and superiority of these methods on multiple real data sets are demonstrated by experimental verification.

Three-Dimensional Cooperative Localization via Space-Air-Ground Integrated Networks

The space-air-ground integrated network(SAGIN)combines the superiority of the satellite,aerial,and ground communications,which is envisioned to provide high-precision positioning ability as well as seamless connectivity in the 5G and Beyond 5G(B5G)systems.In this paper,we propose a three-dimensional SAGIN localization scheme for ground agents utilizing multi-source information from satellites,base stations and unmanned aerial vehicles(UAVs).Based on the designed scheme,we derive the positioning performance bound and establish a distributed maximum likelihood algorithm to jointly estimate the positions and clock offsets of ground agents.Simulation results demonstrate the validity of the SAGIN localization scheme and reveal the effects of the number of satellites,the number of base stations,the number of UAVs and clock noise on positioning performance.

Two-and Three-Dimensional Urban Core Determinants of the Urban Heat Island： A Statistical Approach

There is no doubt that the UHI （urban heat island） is a mounting problem in built-up environments, due to the energy retention by surface dense building materials, leading to increased temperatures, air pollution, and energy consumption. Much of the earlier research on the UHI has used two-dimensional （2-D） information, such as land uses and the distribution of vegetation. In the case of homogeneous land uses, it is possible to predict surface temperatures with reasonable accuracy with 2-D information. However, three-dimensional （3-D） information is necessary to analyze more complex sites, including dense building clusters. In this research, 3-D building geometry information is combined with 2-D urban surface information to examine the relationship between urban characteristics and temperature. The research includes the following stages： （1） estimating urban temperature; （2） developing a 3-D city model; （3） generating geometric parameters; and （4） conducting statistical analyses using both linear and non-linear regression models. The implications of the results are discussed, providing guidelines for policies aiming to reduce the UHI.

Three-Dimensional Scene Encryption Algorithm Based on Phase Iteration Algorithm of the Angular-Spectral Domain

In order to increase the capacity of encrypted information and reduce the loss of information transmission, a three-dimensional(3 D) scene encryption algorithm based on the phase iteration of the angular spectrum domain is proposed in this paper. The algorithm, which adopts the layer-oriented method, generates the computer generated hologram by encoding the three-dimensional scene. Then the computer generated hologram is encoded into three pure phase functions by adopting the phase iterative algorithm based on angular spectrum domain,and the encryption process is completed. The three-dimensional scene encryption can improve the capacity of the information,and the three-phase iterative algorithm can guarantee the security of the encryption information. The numerical simulation results show that the algorithm proposed in this paper realized the encryption and decryption of three-dimensional scenes. At the same time, it can ensure the safety of the encrypted information and increase the capacity of the encrypted information.

Three-dimensional critical slip surface locating and slope stability assessment for lava lobe of Unzen volcano

Even Unzen volcano has been declared to be in a state of relative dormancy,the latest formed lava lobe No.11 now represents a potential slope failure mass based on the latest research.This paper concentrates on the stability of the lava lobe No.11 and its possible critical sliding mass.It proposes geographic information systems (GIS) based three-dimensional (3D) slope stability analysis models.It uses a 3D locating approach to identify the 3D critical slip surface and to analyze the 3D stability of the lava lobe No.11.At the same time,the new 3D approach shows the effectiveness in selecting the range of the Monte Carlo random variables and locating the critical slip surface in different parts of the lava lobe No.11.The results are very valuable for judging the stability of the lava lobe and assigning the monitoring equipments.

Digitizing the Undigitized: Converting Traditional Archaeological Records into Computerized, Three-Dimensional Site Reconstruction

Archaeological excavation involves disintegration, removal, and reassembly of the archaeological record;as such it is considered by many to be an unrepeatable, destructive activity. This perception has contributed to an advancement in archaeological practice, namely, the development of computerized recording systems that digitally record archaeological excavations spatially and volumetrically during fieldwork. This paper is concerned with those archaeological sites where digital field recording has not been done. These sites, recorded by traditional methods, should not be excluded from attempts to restructure the spatial, volumetric, and stratigraphic archaeological data. A thorough methodology for the conversion of traditional records into digitized data is presented, including the detailed procedures required for three-dimensional plotting of recorded data—both the excavated material and the drawn site maps and cross-sections. Finally, the use of these methods is demonstrated on a complex Early to Middle Pleistocene site, illustrating the benefits of digitization and three-dimensional reconstruction in resolving stratigraphic and spatial questions.

异质网中基于邻居节点和元路径的推荐算法

针对现有模型对异质信息网络(heterogeneous information network, HIN)信息提取大部分依赖于元路径,缺乏元路径信息补充以及很少学习异质图中复杂的结构信息等问题,提出一种异质网中基于邻居节点和元路径的推荐算法(NMRec)。提取用户和物品邻居节点补充元路径缺失的信息,以卷积的方式捕获节点之间丰富的交互,通过注意力机制得到节点和元路径的嵌入表示,拼接用户、物品、邻居节点及元路径进行TOP-N推荐。在两个公开数据集上的实验结果表明,NMRec推荐性能良好,对推荐结果有良好的可解释性,与7种推荐基准算法相比,NMRec在评价指标Pre@10、Recall@10、NDGG@10上至少提升了0.21%、29%、1.46%。

虚拟空间具身在场的知觉之维——基于可供性具身认知视角

针对当前数字技术对虚拟空间身体体验建构原理的理论缺失,以及虚拟空间具身性在场体验难以实现的困境,通过比较法分析传统空间表象认知中对经验身体的认识,以及梅洛庞蒂身体转向中对知觉的引入,探讨基于可供性具身认知将空间理解为具有生态信息的知觉空间,将虚拟空间定义为可供用户直接感知并采取行动的知觉空间。运用逻辑分析法用可供性具身认知的“空间-身体-知觉”的同一性特征,解释数字技术下虚拟空间的具身性知觉体验的原理,即通过模拟知觉、身体知觉代理以及身体知觉统合方法,将虚拟空间营造成契合用户知觉、行为规律的具身性知觉体验场所。

广告景别呈现方式会影响广告态度吗——基于整体优先原则的实证研究

随着数字经济时代的到来,企业间竞争愈发激烈,广告成为了企业争夺和占有市场的重要手段。如何有效地利用有限的广告位资源,成为了企业不容忽视的关键问题。本研究基于整体优先原则,从信息加工流畅性视角出发,探究了广告景别呈现方式对广告态度的影响。研究结果表明,相较于近景系列广告,全景系列广告会使消费者的广告态度更积极,信息加工流畅性在该影响过程中起中介作用。消费者思维模式调节了广告景别呈现方式对信息加工流畅性和广告态度的影响,当消费者处于整体(局部)加工思维模式下,相较于近景(全景)系列广告,全景(近景)系列广告使消费者信息加工更加流畅,广告态度更积极。本研究丰富了视觉线索在营销领域中的应用,研究结论对于企业制定和选择广告策略具有一定的实践意义。

合作问题解决视角下《义务教育信息科技课程标准》的研究

信息科技课程中,学科核心素养的培养与合作问题解决能力的培养互相支持、互相渗透。《义务教育信息科技课程标准(2022年版)》以育人目标为导向进行知识选择和内容组织,对课程建设与教学实施具有指导性作用。以课程标准为研究对象,探究合作问题解决能力在课程标准中的呈现情况和渗透力度,将有助于在信息科技课程中更好地落实合作问题解决能力的培养。基于PISA2015合作问题解决能力测评框架,构建合作问题解决视角下课程标准的评价指标体系,将合作问题解决能力的呈现分成6种情况,采用内容分析法,定量刻画、定性诠释课程标准中合作问题解决能力的呈现水平、方式及其效果。通过分析发现:课程标准有意渗透合作问题解决能力,其中合作问题解决能力以显性呈现为主,整体呈现水平处于中上,并在“课程内容”“课程目标”“附录”中的呈现效果较好;课程标准中合作问题解决能力的呈现具有适切性,符合课程内容特点和学习者认知水平;课程标准对合作问题解决能力的渗透虽较有成效,但并不彻底,仍有完善空间。据此,为保证学生能够有效发展合作问题解决能力,提出相关建议:进一步提高课程标准中合作问题解决能力的呈现效果;强化合作问题解决能力在高中课程标准中计算思维部分的呈现;强化过程性评价,提高合作问题解决能力测评的有效性;从课程资源出发,进一步优化合作问题解决能力的培养;教师从合作问题解决能力的视角解读课程标准;紧扣信息科技学科的本质开展合作问题解决活动。

科技创新模式下的西藏农业科技信息咨询发展现状及对策研究

该研究旨在探讨科技创新模式下的西藏农业科技信息咨询路径。首先,通过分析针对农业等特色产业的西藏科技信息咨询服务平台,总结平台已取得的成果;其次,通过现状分析发现,发现平台面临服务覆盖面不足、信息更新不及时和用户需求理解偏差等问题;最后,有针对性地提出了提升科技信息咨询服务的相应策略。

商家自我呈现能够增强顾客的感知信任吗?——基于模特图片呈现特征的研究

在商家与顾客信息交互过程中,模特图片呈现特征对于顾客感知信任的影响。研究表明:模特的图片呈现(有无真人模特、模特的肤色、模特的体型)正向影响顾客的感知信任,并且感知相似性在模特图片呈现特征对顾客感知信任的影响中起到部分中介作用;网购平台的可信度和互动性、顾客的心理模拟以及信任倾向正向调节模特图片呈现对感知信任的影响,且均正向调节感知相似性的中介作用。文章有利于缓解社会身材焦虑现象,丰富了线上商务活动中消费者行为学的研究,对于消费者的信任产生机制进行探讨,并进一步丰富了视觉营销理论,对商家的自我呈现进行有效的指导,也可以为网络商家进行有效的产品图片展示提供理论参考。

Three-dimensional color photon counting microscopy using Bayesian estimation with adaptive priori information

In this Letter, we propose a novel three-dimeusional （3D） color microscopy for microorganisms under photon- starved conditions using photon counting integral imaging and Bayesian estimation with adaptive priori infor- mation. In photon counting integral imaging, 3D images can be visualized using maximum likelihood estimation （MLE）. However, since MLE does not consider a priori information of objects, the visual quality of 3D images may not be accurate. In addition, the only grayscale image can be reconstructed. Therefore, to enhance the visual quality of 3D images, we propose photon counting microscopy using maximum a posteriori with adaptive priori information. In addition, we consider a wavelength of each basic color channel to reconstruct 3D color images. To verify our proposed method, we carry out optical experiments.

数字人文视角下文化遗产信息的演进、呈现与管理

数字人文作为当前将文化对象与数字技术有效结合的热点领域,可以为我国文化遗产信息管理体系提供新的路径与模式。当代数字化转型正在推动文化遗产信息记录的形式和观念发生变革,拓展数智赋能和基于遗产全生命周期信息管理的新形式。在结合多元主体、学科、界面及视觉的基础上,信息记录借助数字媒介形成并优化其内容的多维呈现方式,可创造虚实相生的遗产场景,推进文化遗产的可视化、情境化、交互化。数字技术可助力文化遗产信息的精准管理,针对多尺度多层级的信息管理的技术要求,形成建筑遗产的数字化信息集成,进而探索文化遗产全链条精准管理的新思路,打造多方参与和动态交互的遗产信息管理体系与共享互馈模式,为文化遗产保护的迭代进阶提供新的可能。

在线公益平台情境下用户连接何以形成——基于过程视角的实证研究

在线公益平台情境下的用户连接行为对公益引流有着重要作用,让公益资源供需双方的接触、交互和匹配摆脱时空的限制。从过程视角来看,基于对深度访谈资料的扎根理论分析结果,结合刺激—机体—反应模型,构建了在线公益平台情境下用户连接行为形成的“用户连接平台”到“用户连接项目”二阶段模型,采用纵向追踪调查法收集数据,以结构方程验证了该模型。实证结果发现,潜在用户在公益氛围、口碑推荐、信息触达等社会影响因素的刺激下通过感知价值和情绪唤醒的双路径产生连接平台行为,一般用户在视觉吸引力、目标可实现、受益人线索等信息呈现因素的刺激下通过项目认同和共情唤起的双重中介作用于其连接项目行为。研究结论不但阐释了慈善公益领域用户连接形成的复杂过程及内在机制,还为促进用户连接、吸纳公益资源、培育互联互赢的公益生态提供启示。